Self-cooling hydraulic cylinder and working method thereof

Abstract

The present invention discloses a self-cooling hydraulic cylinder and a working method thereof, which relates to the technical field of hydraulic cylinders, including a hydraulic cylinder, a driven centrifugal heat removal assembly installed on the outer wall of the hydraulic cylinder body, a hollow cylindrical shell fixed at the lower end of the hydraulic cylinder, and a planetary gear transmission structure installed inside the hollow cylindrical shell. A cage-column transmission ring for transmitting the rotational power of the planetary gear transmission structure to the driven centrifugal heat removal assembly is installed at the edge position of the top of the hollow cylindrical shell, and a stepper motor for driving the planetary gear transmission structure is installed on one side of the bottom end of the hollow cylindrical shell. The present invention reconstructs the heat dissipation boundary layer of the hydraulic cylinder body through a centrifugal and axial flow composite wind field, and relies on the planetary gear transmission structure, the cage-column transmission ring, and the stepper motor to achieve precise energy transmission, thereby achieving efficient forced air cooling while maintaining the compact structure of the hydraulic cylinder, extending the heat saturation working time, and reducing the failure rate of the hydraulic cylinder.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic oil cylinders, in particular to a self-cooling hydraulic oil cylinder and a working method thereof. Background Art

[0002] Hydraulic cylinders play a key role in mechanical automation and industrial equipment. They are mainly used to convert hydraulic energy into linear mechanical motion to achieve various actions such as pushing, pulling, lifting, etc. Their structure consists of a cylinder body, a piston, a piston rod, and a seal. The cylinder body serves as a storage space for the oil and is equipped with a piston inside. The piston is pushed by the pressure of the hydraulic oil to move, thereby driving the mechanical load. The working principle of the hydraulic cylinder is simple and efficient. It can provide large thrust in a short time, with smooth movement, which is convenient for automatic control and precise positioning. However, during operation, the hydraulic cylinder will generate heat, which is mainly caused by friction generated by pressure flow, compression heat, and friction of seals. The oil in the system absorbs a lot of heat during the circulation process. In addition, the heat dissipation conditions are limited, resulting in an increase in oil temperature, affecting the normal operation of the system. Excessive temperature will not only reduce the lubrication performance of the oil, but also accelerate the aging of the seals and even cause equipment failure. In order to ensure the stability of the hydraulic system and extend the life of the equipment, heat dissipation measures such as radiators and cooling systems are often used;

[0003] For example, a self-cooling hydraulic cylinder disclosed in application publication number CN118881614A includes a cylinder body and a piston rod slidably installed in the cylinder body. The hydraulic cylinder also includes a heat-conducting layer embedded in the outside of the cylinder body, an upper ring and a lower ring rotatably sleeved on the outside of the cylinder body, and the upper ring and the lower ring are symmetrically distributed up and down about the transverse center line of the heat-conducting layer; a plurality of cooling tubes are connected to the upper ring and the lower ring at equal angles, a water inlet pipe is connected to the top of the cooling tube, the water inlet pipe is embedded and fixed inside the upper ring, and a transmission pipe is connected to the bottom of the cooling tube. It is provided with structures such as a heat-conducting layer and cooling tubes. It can be seen that the above technical solution mainly relies on the heat-conducting layer and cooling tubes to assist the oil flowing in the cylinder in cooling down. However, during the operation of the cylinder, it is mainly the hydraulic oil that flows inside to drive the piston movement, and the outside is exposed to the air. The air flow rate outside the cylinder is low. One of the reasons is that there is no active air flow mechanism on its surface, and heat is difficult to dissipate quickly, resulting in an increase in the surface temperature of the cylinder. Especially under high load or long-term operation, the heat accumulation will be more obvious, causing the operating temperature of the hydraulic cylinder to exceed the design range. Summary of the Invention

[0004] The purpose of the present invention is to provide a self-cooling hydraulic cylinder and a working method thereof. A driven centrifugal heat removal assembly is installed on the outer peripheral surface of the cylinder body of the hydraulic cylinder. The driving shaft of the stepper motor drives the driven centrifugal heat removal assembly through a planetary gear transmission structure and a cage-column transmission ring to quickly discharge the heat generated by the hydraulic cylinder during operation. At the same time, the planetary gear transmission structure also transmits the rotational power to each axial flow blowing assembly, and the axial flow blowing assembly is used to further blow air downward and dissipate heat from the stepper motor to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a self-cooling hydraulic cylinder, comprising a hydraulic cylinder, a driven centrifugal heat removal assembly installed on the outer wall of the hydraulic cylinder body, a hollow cylindrical shell fixed at the lower end of the hydraulic cylinder, and a planetary gear transmission structure installed inside the hollow cylindrical shell, a cage-column transmission ring for transmitting the rotational power of the planetary gear transmission structure to the driven centrifugal heat removal assembly is installed at the edge position of the top end of the hollow cylindrical shell, a stepper motor for driving the planetary gear transmission structure is installed on one side of the bottom end of the hollow cylindrical shell, and two axial flow blowing assemblies in a mirror-symmetrical relationship are installed at the bottom end of the hollow cylindrical shell, the input shaft end of the axial flow blowing assembly and one of the output shaft ends of the planetary gear transmission structure are connected to each other, and the air outlet end of the axial flow blowing assembly faces the stepper motor.

[0006] Preferably, the hydraulic cylinder consists of an outer cylinder barrel, an upper cylinder seat, a lower cylinder seat, a piston unit and a piston rod. The upper cylinder seat and the lower cylinder seat are sealed and bolted to the upper end and the lower end of the outer cylinder barrel respectively. The piston unit is slidably installed at one end inside the outer cylinder barrel. The piston rod is coaxially fixed inside the piston unit, and the upper end of the piston rod extends upward and passes through the outside of the upper cylinder seat.

[0007] Preferably, an upper right-angle liquid inlet joint is installed on the outer wall of one side of the upper cylinder seat, and an L-shaped flow channel for connecting to the internal chamber of the outer cylinder barrel is installed inside the upper cylinder seat. The upper right-angle liquid inlet joint is used to deliver the hydraulic oil into the outer cylinder barrel through the L-shaped flow channel, and a liquid inlet elbow is installed on the outer wall of one side of the lower cylinder seat, and the lower end of the liquid inlet elbow passes through the outside of the hollow cylindrical shell and is installed with a lower right-angle liquid inlet joint.

[0008] Preferably, a plurality of ribs extending in the axial direction are integrally formed on the outer wall of the outer cylinder.

[0009] Preferably, the driven centrifugal heat exhaust assembly includes a casing coaxial with the outer cylinder, an impeller rotatably mounted on the top of the casing, and a grille detachably mounted at the exhaust port of the casing. The top of the casing is fixedly connected to the bottom end of the upper cylinder seat, and air inlets are provided at the upper and lower ends of the casing.

[0010] Preferably, an inner support ring is fixed at the top opening position of the casing, and an annular support rim is integrally formed at the outer edge position of the inner support ring, and an inverted L-shaped ring edge is integrally formed at the outer edge position of the top of the impeller, and the inverted L-shaped ring edge and the annular support rim are embedded in each other and maintain a sliding connection state.

[0011] Preferably, the cage-column type transmission ring includes a final inner gear ring rotatably mounted at the top edge of the hollow cylindrical shell and a plurality of bending ribs mounted in an equidistant annular array at the top of the final inner gear ring. The top of the bending ribs extends upward and is fixedly connected to the bottom end of the impeller through the air inlet.

[0012] Preferably, the hollow cylindrical shell includes a top plate fixed to the bottom end of the lower cylinder seat, a middle shell fixed at the bottom end of the top plate, and a bottom plate installed at the edge position of the bottom end of the middle shell, the outer wall of the middle shell is provided with three annular hollow grooves with equal spacing, the bottom end of the final-stage inner gear ring is rotatably connected to the top end of the top plate, the planetary gear transmission structure includes a middle shaft rotatably mounted at the center position of the top end of the bottom plate, a first gear and a third gear fixed at both ends of the middle shaft surface, and three side shafts rotatably mounted at the edge position of the top end of the bottom plate, one end of the side shaft surface is fixed with a second gear for meshing with the first gear, the lower end of one of the side shafts is fixedly connected to the top end of the driving shaft of the stepping motor, the bottom ends of the other two side shafts extend to the outside of the bottom plate and are connected to each other with the axial flow blowing assembly, the top end of the top plate is rotatably mounted with a driven gear shaft, the driven gear shaft is meshed with the third gear and the final-stage inner gear ring, one side of the interior of the top plate, the middle shell, and the bottom plate is provided with a through hole for the liquid inlet elbow to pass through, and the stepping motor is mounted on one side of the bottom end of the bottom plate.

[0013] Preferably, the axial flow blowing assembly includes an axial flow fan installed on one side of the bottom end of the base plate, an air outlet pipe on the bottom end of the air outlet of the axial flow fan, and a flat air nozzle installed at one end of the air outlet pipe away from the axial flow fan, wherein the bottom ends of the two side axes are fixedly connected to the center points of the fan blades inside the axial flow fan.

[0014] The present invention also provides a method for operating a self-cooling hydraulic cylinder, such as the self-cooling hydraulic cylinder described above, comprising the following steps:

[0015] S101: During the operation of the hydraulic cylinder, the stepper motor is turned on and works synchronously. The drive shaft of the stepper motor outputs rotational power to the planetary gear transmission structure in the hollow cylindrical shell. The planetary gear transmission structure transmits the power to the driven centrifugal heat removal assembly through the cage-column transmission ring. The driven centrifugal heat removal assembly rotates at high speed to perform heat dissipation. The driven centrifugal heat removal assembly accelerates and ejects air along the tangential direction of the outer wall of the hydraulic cylinder, directly destroying the hot air layer trapped on the surface of the cylinder body and establishing high-intensity convective heat exchange. A low-pressure area is formed in the center of the driven centrifugal heat removal assembly, and external cold air is sucked in axially from both ends of the cylinder body, running through the entire length of the cylinder body, eliminating local high-temperature points.

[0016] S102: During the heat dissipation process, each axial-flow blowing assembly receives the rotational power from the stepper motor through the planetary gear transmission structure. The axial-flow blowing assembly blows air out at high speed in a specific direction, forming a directional cooling airflow toward the stepper motor, thereby increasing the contact area between the air and the stepper motor surface. Simultaneously, because the air inlet of the axial-flow blowing assembly faces the hollow cylindrical shell, the planetary gear transmission structure, and the hydraulic cylinder, part of the intake airflow passes through the hollow structure of the hollow cylindrical shell, thereby forcibly cooling the meshing surface of the planetary gear transmission structure.

[0017] S103: During the cooling process, regularly check the lubricating oil status of the planetary gear transmission structure in the hollow cylindrical housing to ensure normal lubrication and avoid increased mechanical friction and heat generation due to poor lubrication;

[0018] S104: After the hydraulic cylinder stops working, the speed of the stepper motor is reduced to gradually reduce the speed of the driven centrifugal heat exhaust assembly and the axial flow blowing assembly, so that the hydraulic cylinder gradually returns to a normal temperature state.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: the self-cooling hydraulic oil cylinder and its working method are provided with a hydraulic cylinder, a driven centrifugal heat removal assembly, a hollow cylindrical shell, a planetary gear transmission structure in the hollow cylindrical shell, a cage column type transmission ring, a stepping motor and an axial flow blowing assembly, etc., which cooperate with each other. The driven centrifugal heat removal assembly is installed on the outer peripheral surface of the cylinder body of the hydraulic cylinder. The driving shaft of the stepping motor drives the driven centrifugal heat removal assembly to work through the planetary gear transmission structure and the cage column type transmission ring, so as to quickly discharge the heat generated by the hydraulic cylinder during operation. At the same time, the planetary gear transmission structure also transmits the rotary power to each axial flow blowing assembly, and the axial flow blowing assembly is used to further blow air downward and dissipate heat for the stepping motor, thereby reconstructing the heat dissipation boundary layer of the hydraulic cylinder body through the centrifugal and axial flow composite wind field, and relying on the planetary gear transmission structure, the cage column type transmission ring and the stepping motor to realize precise energy transmission, thereby achieving efficient forced air cooling while maintaining the compact structure of the hydraulic cylinder, extending the heat saturation working time, and reducing the failure rate of the hydraulic cylinder;

[0020] The impeller structure of the driven centrifugal heat exhaust assembly rotates at high speed under the drive of the planetary gear transmission structure and the cage-column transmission ring, throwing the air out at high speed along the tangential direction of the cylinder, directly tearing the static air insulation layer attached to the cylinder wall, and significantly improving the convection heat exchange efficiency between the cylinder surface and the environment. The low-pressure area formed in the central area of ​​the driven centrifugal heat exhaust assembly continuously draws in external cold air, forcing the airflow to flow along the axial direction of the cylinder, and constructing a cooling channel covering the entire length of the cylinder. Compared with traditional natural convection heat dissipation, it is more active and efficient, especially suitable for high-load or long-term continuous operation. In the occasion of operation, it ensures that the temperature of the hydraulic cylinder and stepper motor is maintained within a reasonable range to avoid performance degradation and equipment damage caused by excessive temperature; secondly, the planetary gear transmission structure is used to transmit the rotary power to each axial flow blowing assembly to further enhance the cooling effect. The axial flow blowing assembly blows air at high speed along a specific direction toward the stepper motor to form a directional cold air flow, preventing the stepper motor from overheating and causing control inaccuracy, enhancing air fluidity and heat exchange efficiency, avoiding the influence of ambient temperature and spatial layout on the heat dissipation effect, and making the heat dissipation process more stable and controllable;

[0021] Finally, through the rotational power of the stepper motor, precise adjustment of each axial-flow blowing assembly and driven centrifugal heat removal assembly can be achieved, which means that under different working conditions, the operator can adjust the speed of the axial-flow blowing assembly and the working state of the driven centrifugal heat removal assembly according to actual needs, thereby optimizing the heat dissipation effect. This precise control not only improves the heat dissipation efficiency, but also avoids the problems of excessive or insufficient heat dissipation, ensuring that the hydraulic cylinder operates stably within a safe temperature range. The planetary gear transmission structure and cage-column transmission ring can achieve efficient power transmission and mechanical amplification, and realize efficient driving of the axial-flow blowing assembly and the driven centrifugal heat removal assembly. At this time, the use of a unified drive source can further simplify the structural design of the hydraulic cylinder, reduce electrical and mechanical connection points, and reduce the failure rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the three-dimensional structure of the present invention Figure 1 ;

[0023] Figure 2 Schematic diagram of the three-dimensional structure of the present invention Figure 2 ;

[0024] Figure 3 This is a schematic diagram of the upper and lower isometric three-dimensional structure of the present invention;

[0025] Figure 4 This is a schematic diagram of the main cross-sectional structure of the present invention;

[0026] Figure 5 It is a schematic diagram of the three-dimensional cross-sectional structure of the present invention;

[0027] Figure 6This is a schematic diagram of the three-dimensional structure of the second embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram of a three-dimensional cross-sectional structure of a hydraulic cylinder according to a second embodiment of the present invention;

[0029] Figure 8 This is a schematic diagram of the three-dimensional structure of a hydraulic cylinder according to the second embodiment of the present invention;

[0030] Figure 9 Schematic diagram of the three-dimensional structure of the driven centrifugal heat removal assembly according to the third embodiment of the present invention;

[0031] Figure 10 Schematic diagram of the three-dimensional cross-sectional structure of the driven centrifugal heat removal assembly according to the third embodiment of the present invention;

[0032] Figure 11 Schematic diagram of the three-dimensional structure of the fourth embodiment of the present invention;

[0033] Figure 12 This is a schematic diagram of the three-dimensional structure of the axial flow blowing assembly according to the fourth embodiment of the present invention;

[0034] Figure 13 Schematic diagram of the three-dimensional structure of the hollow cylindrical shell according to the fourth embodiment of the present invention;

[0035] Figure 14 This is a schematic diagram of the three-dimensional structure of the planetary gear transmission structure of the fourth embodiment of the present invention.

[0036] In the figure: 1. Hydraulic cylinder; 101. Outer cylinder; 1011. Ribs; 102. Upper cylinder seat; 1021. Upper right-angle liquid inlet connector; 103. Lower cylinder seat; 1031. Liquid inlet elbow; 1032. Lower right-angle liquid inlet connector; 104. Piston unit; 105. Piston rod; 2. Driven centrifugal heat removal assembly; 201. Casing; 2011. Air inlet; 202. Grille; 203. Impeller; 2031. Inverted L-shaped ring edge; 3. Hollow cylindrical shell; 301. Middle shell; 302. Top plate; 303, bottom plate; 304, hollow slot; 4, stepper motor; 5, axial-flow blower assembly; 501, axial-flow fan; 502, air outlet duct; 503, flat-mouth nozzle; 6, planetary gear transmission structure; 601, center shaft; 602, side shaft; 603, secondary gear; 604, driven gear shaft; 605, primary gear; 606, third gear; 7, cage-column transmission ring; 701, bending rib; 702, final-stage inner gear ring; 8, inner support ring; 801, annular support flange. DETAILED DESCRIPTION

[0037] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0038] Embodiment 1, by Figures 1 to 5 The present invention includes a hydraulic cylinder 1, a driven centrifugal heat removal assembly 2 installed on the outer wall of the hydraulic cylinder 1, a hollow cylindrical shell 3 fixed at the lower end of the hydraulic cylinder 1, and a planetary gear transmission structure 6 installed inside the hollow cylindrical shell 3. A cage-column transmission ring 7 for transmitting the rotational power of the planetary gear transmission structure 6 to the driven centrifugal heat removal assembly 2 is installed at the edge position of the top of the hollow cylindrical shell 3. A stepper motor 4 for driving the planetary gear transmission structure 6 is installed on one side of the bottom end of the hollow cylindrical shell 3. Two axial flow blowing assemblies 5 in a mirror-symmetrical relationship are installed at the bottom end of the hollow cylindrical shell 3. The input shaft end of the axial flow blowing assembly 5 and one of the output shaft ends of the planetary gear transmission structure 6 are connected to each other, and the air outlet end of the axial flow blowing assembly 5 faces the stepper motor 4.

[0039] The staff can arrange a motor controller on the mounting surface near the hydraulic cylinder 1, and use the motor controller to control the stepper motor 4 to control the stepper motor 4 to work according to the set direction, speed, angle, and response time, so as to indirectly control the rotation speed, heat dissipation, and cooling intensity of the driven centrifugal heat exhaust assembly 2 and the axial flow blowing assembly 5.

[0040] A method for operating a self-cooling hydraulic cylinder according to this embodiment, such as the above-mentioned self-cooling hydraulic cylinder, includes the following steps:

[0041] S101: During the operation of the hydraulic cylinder 1, the stepper motor 4 is turned on and works synchronously. The driving shaft of the stepper motor 4 outputs rotary power to the planetary gear transmission structure 6 in the hollow cylindrical shell 3. The planetary gear transmission structure 6 transmits the power to the driven centrifugal heat removal assembly 2 through the cage-column transmission ring 7. The driven centrifugal heat removal assembly 2 rotates at high speed to perform heat dissipation. The driven centrifugal heat removal assembly 2 accelerates and ejects air along the tangential direction of the outer wall of the hydraulic cylinder 1, directly destroying the hot air layer trapped on the surface of the cylinder body, establishing high-intensity convective heat exchange, and forming a low-pressure area in the center of the driven centrifugal heat removal assembly 2. External cold air is sucked in axially from both ends of the cylinder body, running through the entire length of the cylinder body, eliminating local high-temperature points;

[0042] S102: During the heat dissipation process, each axial-flow blowing assembly 5 receives the rotational power from the stepping motor 4 through the planetary gear transmission structure 6. The axial-flow blowing assembly 5 blows air out at high speed in a specific direction, forming a directional cold air flow toward the stepping motor 4, thereby increasing the contact area between the air and the surface of the stepping motor 4. At the same time, because the air inlet of the axial-flow blowing assembly 5 is directed toward the hollow cylindrical shell 3, the planetary gear transmission structure 6, and the hydraulic cylinder 1, part of the intake air flow passes through the hollow structure of the hollow cylindrical shell 3, thereby forcibly cooling the meshing surface of the planetary gear transmission structure 6.

[0043] S103: During the cooling process, regularly check the lubricating oil status of the planetary gear transmission structure 6 in the hollow cylindrical housing 3 to ensure normal lubrication and avoid increased mechanical friction and heat generation due to poor lubrication;

[0044] S104: After the hydraulic cylinder 1 stops working, the rotation speed of the stepper motor 4 is reduced to gradually reduce the rotation speeds of the driven centrifugal heat exhaust assembly 2 and the axial flow blowing assembly 5, so that the hydraulic cylinder 1 gradually returns to a normal temperature state.

[0045] Example 2, based on Example 1, Figure 6 、 Figure 7 and Figure 8 The hydraulic cylinder 1 is composed of an outer cylinder barrel 101, an upper cylinder base 102, a lower cylinder base 103, a piston unit 104 and a piston rod 105. The upper cylinder base 102 and the lower cylinder base 103 are sealed and bolted to the upper and lower ends of the outer cylinder barrel 101 respectively. The piston unit 104 is slidably installed at one end inside the outer cylinder barrel 101. The piston rod 105 is coaxially fixed inside the piston unit 104. The upper end of the piston rod 105 extends upward and passes through the outside of the upper cylinder base 102.

[0046] An upper right-angle liquid inlet joint 1021 is installed on the outer wall of one side of the upper cylinder seat 102, and an L-shaped flow channel for communicating with the internal chamber of the outer cylinder barrel 101 is installed inside the upper cylinder seat 102. The upper right-angle liquid inlet joint 1021 is used to send the hydraulic oil into the outer cylinder barrel 101 through the L-shaped flow channel. A liquid inlet elbow 1031 is installed on the outer wall of one side of the lower cylinder seat 103. The lower end of the liquid inlet elbow 1031 passes through the outside of the hollow cylindrical shell 3 and is installed with a lower right-angle liquid inlet joint 1032. The upper right-angle liquid inlet joint 1021 and the lower right-angle liquid inlet joint 1032 are connected to the pumping end of the external hydraulic oil through oil pipes, so that the hydraulic oil enters the upper end or lower end of the outer cylinder barrel 101; when the hydraulic pressures at the upper and lower positions of the piston unit 104 are different, the piston unit 104 and the piston rod 105 will move linearly along the side with smaller hydraulic pressure, thereby converting hydraulic energy into linear mechanical motion;

[0047] The contact surfaces between the upper cylinder seat 102, the lower cylinder seat 103 and the outer cylinder barrel 101, the contact surface between the upper cylinder seat 102 and the piston rod 105, and the contact surface between the piston unit 104 and the outer cylinder barrel 101 can all adopt sealing solutions in the prior art to reduce leakage and energy loss, thereby ensuring efficient operation of the hydraulic cylinder 1;

[0048] The hydraulic oil is delivered to one or both sides of the outer cylinder 101 through the pipeline, forming a pressure difference, driving the piston unit 104 and the piston rod 105 to move. Depending on the control method and the installation method of the hydraulic cylinder 1, various movements such as pushing, pulling, lifting, and tilting can be achieved;

[0049] Several ribs 1011 extending in the axial direction are integrally formed on the outer wall of the outer cylinder 101. Several ribs 1011 extending in the axial direction are integrally formed on the outer wall of the outer cylinder 101. The ribs 1011 increase the heat dissipation area and structural strength, and make the outer cylinder 101 an efficient thermal bridge to prevent heat accumulation in the sealed chamber.

[0050] Example 3, based on Example 2, Figure 9 and Figure 10 The driven centrifugal heat removal assembly 2 includes a casing 201 coaxial with the outer cylinder 101, an impeller 203 rotatably mounted on the top of the casing 201, and a grille 202 detachably mounted at the exhaust port of the casing 201. The top of the casing 201 is fixedly connected to the bottom of the upper cylinder base 102. The upper and lower ends of the casing 201 are both provided with air inlets 2011. When the impeller 203 rotates, external air is mainly sucked into the casing 201 through the lower air inlet 2011.

[0051] When the impeller 203 is driven to rotate, the central low-pressure area of ​​the impeller 203 draws in cold air from both ends of the outer cylinder 101, forming a through-type cooling airflow. At this time, the air is thrown out at high speed along the tangent line of the outer cylinder 101, so that the hot air is sent out from the grille 202.

[0052] An inner support ring 8 is fixed to the top opening of the casing 201, and an annular support rim 801 is integrally formed at the outer edge of the inner support ring 8. An inverted L-shaped ring edge 2031 is integrally formed at the outer edge of the top of the impeller 203. The inverted L-shaped ring edge 2031 and the annular support rim 801 are mutually engaged and maintained in a sliding connection. The upper end of the impeller 203 is mutually engaged and maintained in a sliding connection with the annular support rim 801 at the outer edge of the inner support ring 8 via the inverted L-shaped ring edge 2031. The inverted L-shaped ring edge 2031 and the annular support rim 801 improve the rotational stability of the impeller 203 and provide a continuous cooling effect in a continuous working environment.

[0053] The cage-column transmission ring 7 includes a final-stage inner gear ring 702 rotatably mounted at the top edge of the hollow cylindrical shell 3 and a plurality of bending ribs 701 installed in an equidistant annular array at the top of the final-stage inner gear ring 702. The top of the bending rib 701 extends upward and is fixedly connected to the bottom end of the impeller 203 through the air inlet 2011. The rotational power of the stepper motor 4 is transmitted to the cage-column transmission ring 7 through the planetary gear transmission structure 6, that is, the final-stage inner gear ring 702 is driven to rotate, and then the final-stage inner gear ring 702 drives the impeller 203 in the casing 201 to rotate through the bending rib 701. The open cage-like structure formed by the bending rib 701 and the final-stage inner gear ring 702 allows the cooling airflow to pass freely and ensures a stable power connection between the driven centrifugal heat exhaust assembly 2 and the planetary gear transmission structure 6.

[0054] Example 4, based on Example 3, Figure 11 、 Figure 12 、 Figure 13 and Figure 14 The hollow cylindrical shell 3 includes a top plate 302 fixed to the bottom end of the lower cylinder base 103, a middle shell 301 fixed to the bottom end of the top plate 302, and a bottom plate 303 installed at the bottom edge of the middle shell 301. Three annular hollow grooves 304 with equal spacing are provided on the outer wall of the middle shell 301. The bottom end of the final stage inner gear ring 702 is rotatably connected to the top end of the top plate 302. Since the lower end of the final stage inner gear ring 702 rotates with the top plate 302, the top plate 302 ensures the stable rotation of the final stage inner gear ring 702.

[0055] The hollow cylindrical shell 3 serves as a lightweight support to accommodate the planetary gear transmission structure 6, and the hollow channel therein promotes airflow penetration;

[0056] The planetary gear transmission structure 6 includes a central shaft 601 rotatably mounted at the center position of the top of the bottom plate 303, a first gear 605 and a third gear 606 fixed at both ends of the surface of the central shaft 601, and three side shafts 602 rotatably mounted at the edge position of the top of the bottom plate 303. One end of the surface of the side shaft 602 is fixed with a second gear 603 for meshing with the first gear 605. The lower end of one of the side shafts 602 is fixedly connected to the top of the driving shaft of the stepper motor 4. The bottom ends of the other two side shafts 602 extend to the outside of the bottom plate 303 and are interconnected with the axial flow blowing assembly 5. A driven gear shaft 604 is rotatably mounted on the top of the top plate 302. The driven gear shaft 604 meshes with the third gear 606 and the final stage inner gear ring 702. A through hole for the liquid inlet elbow 1031 to pass through is provided on one side of the top plate 302, the middle shell 301 and the inside of the bottom plate 303. The stepper motor 4 is mounted on one side of the bottom end of the bottom plate 303.

[0057] After the primary gear 605 and the central shaft 601 are driven to rotate, the central shaft 601 drives the final internal gear ring 702 to rotate through the third gear 606 and the driven gear shaft 604, so that the impeller 203 obtains the rotational power from the stepper motor 4 through the cage-column transmission ring 7 and the planetary gear transmission structure 6, achieving efficient power transmission;

[0058] The axial flow blowing assembly 5 has a compact structure, low noise and high efficiency, can continuously provide cooling air, enhance air flow and improve heat dissipation effect, and the axial flow blowing assembly 5 includes an axial flow fan 501 installed on one side of the bottom end of the base plate 303, an air outlet pipe 502 on the bottom end of the air outlet of the axial flow fan 501 and a flat air nozzle 503 installed at one end of the air outlet pipe 502 away from the axial flow fan 501, wherein the bottom ends of the two side shafts 602 are fixedly connected to the center point of the inner blades of the axial flow fan 501, and when the stepper motor 4 is working, the driving force of the stepper motor 4 is The shaft drives one of the side shafts 602 and the secondary gear 603 to rotate, and then the remaining side shafts 602 and the secondary gears 603 also rotate synchronously under the drive of the primary gear 605. The side shaft 602 drives the axial flow fan 501 to work. At this time, the axial flow fan 501 generates axial airflow, and this part of the axial airflow is continuously blown toward the stepper motor 4 through the air outlet pipe 502 and the flat air nozzle 503 to assist in cooling the stepper motor 4. The heat generated by the operation of this part of the planetary gear transmission structure 6 is also sucked in and sent out by the axial flow blowing assembly 5.

[0059] When the embodiment of the present application is in use, first, before the hydraulic cylinder 1 starts working, the entire equipment is inspected to check whether the temperature and pressure of the hydraulic oil at the liquid inlet end of the hydraulic cylinder 1 are within the normal range, to ensure that the fluidity of the hydraulic oil is good, to avoid system instability caused by excessive oil temperature, and at the same time, to confirm whether the driven centrifugal heat removal assembly 2 works flexibly, whether the hollow cylindrical shell 3 is intact, and whether the planetary gear transmission structure 6 and the cage column transmission ring 7 are operating normally, to ensure that all components are in good condition, to lay the foundation for subsequent cooling and heat dissipation operations; during the operation of the hydraulic cylinder 1, the stepper motor 4 starts to work synchronously, and the drive of the stepper motor 4 The shaft outputs the rotary power to the planetary gear transmission structure 6 in the hollow cylindrical shell 3, and the planetary gear transmission structure 6 transmits the power to the driven centrifugal heat removal assembly 2 through the cage column transmission ring 7. The driven centrifugal heat removal assembly 2 rotates at a high speed to perform the heat dissipation action. During this process, the open design of the cage column transmission ring 7 allows natural ventilation during the transmission process to avoid overheating of various transmission components; the driven centrifugal heat removal assembly 2 accelerates the injection of air along the tangential direction of the outer wall of the hydraulic cylinder 1, directly destroying the hot air layer retained on the surface of the cylinder body, establishing high-intensity convection heat exchange, and forming a low-pressure area in the center of the driven centrifugal heat removal assembly 2, sucking external cold air from both sides of the cylinder body The air flows in axially from the end, runs through the entire length of the cylinder, and eliminates local high-temperature points. At this time, the heat of the outer wall of the hydraulic cylinder 1 is conducted to the surface through the metal and is continuously taken away by the high-speed airflow to reduce the temperature of the cylinder. In the heat dissipation process, each axial-flow blowing assembly 5 receives the rotational power from the stepping motor 4 through the planetary gear transmission structure 6. The axial-flow blowing assembly 5 blows the air out at high speed in a specific direction and forms a directional cold air flow for the stepping motor 4, thereby increasing the contact area between the air and the surface of the stepping motor 4. At the same time, since the air inlet of the axial-flow blowing assembly 5 is facing the hollow cylindrical shell 3, the planetary gear transmission structure 6 and the hydraulic cylinder 1, part of the intake air flow passes through the hollow cylindrical shell 3. The hollow structure is used to force air cooling on the meshing surface of the planetary gear transmission structure 6 to reduce the high-temperature deterioration of the lubricating oil; during the cooling process, the lubricating oil status of the planetary gear transmission structure 6 in the hollow cylindrical shell 3 is checked regularly to ensure normal lubrication, avoid increased mechanical friction due to poor lubrication, generate more heat, and pay attention to the temperature changes of the driven centrifugal heat dissipation assembly 2 and each axial flow blowing assembly 5; after the hydraulic cylinder 1 stops working, reduce the speed of the stepper motor 4 to gradually reduce the speed of the driven centrifugal heat dissipation assembly 2 and the axial flow blowing assembly 5, so that the hydraulic cylinder 1 gradually returns to normal temperature to prevent sudden cooling from causing mechanical stress or deformation.

[0060] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0061] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A self-cooling hydraulic cylinder, characterized by: The invention comprises a hydraulic cylinder (1), a driven centrifugal heat removal assembly (2) mounted on the outer wall of the hydraulic cylinder (1), a hollow cylindrical shell (3) fixed at the lower end of the hydraulic cylinder (1), and a planetary gear transmission structure (6) mounted inside the hollow cylindrical shell (3), wherein a cage column type transmission ring (7) for transmitting the rotational power of the planetary gear transmission structure (6) to the driven centrifugal heat removal assembly (2) is mounted at the edge position of the top end of the hollow cylindrical shell (3), a stepper motor (4) for driving the planetary gear transmission structure (6) is mounted on one side of the bottom end of the hollow cylindrical shell (3), and two axial flow blowing assemblies (5) in a mirror-symmetrical relationship are mounted at the bottom end of the hollow cylindrical shell (3), the input shaft end of the axial flow blowing assembly (5) and one of the output shaft ends of the planetary gear transmission structure (6) are connected to each other, and the air outlet end of the axial flow blowing assembly (5) faces the stepper motor (4); the hydraulic cylinder (1) is composed of an outer cylinder barrel (101), an upper cylinder seat ( 102), a lower cylinder seat (103), a piston monomer (104) and a piston rod (105), wherein the upper cylinder seat (102) and the lower cylinder seat (103) are respectively fixed to the upper end and the lower end of the outer cylinder (101) by sealing bolts, and the piston monomer (104) is slidably mounted on one end inside the outer cylinder (101), and the piston rod (105) is coaxially fixed inside the piston monomer (104), and the upper end of the piston rod (105) extends upward and The upper cylinder seat (102) extends to the outside of the upper cylinder seat (102); an upper right-angle liquid inlet joint (1021) is installed on one side outer wall of the upper cylinder seat (102); an L-shaped flow channel for communicating with the inner chamber of the outer cylinder barrel (101) is installed inside the upper cylinder seat (102); the upper right-angle liquid inlet joint (1021) is used to send hydraulic oil into the outer cylinder barrel (101) through the L-shaped flow channel; a liquid inlet elbow (1031) is installed on one side outer wall of the lower cylinder seat (103); The lower end of the liquid inlet elbow (1031) passes through the outside of the hollow cylindrical shell (3) and is installed with a lower right-angle liquid inlet joint (1032); the driven centrifugal heat exhaust assembly (2) includes a casing (201) coaxial with the outer cylinder (101), an impeller (203) rotatably installed on the top of the casing (201), and a grille (202) detachably installed at the exhaust port of the casing (201); the top end of the casing (201) is fixedly connected to the bottom end of the upper cylinder seat (102), and the upper and lower ends of the casing (201) are both provided with air inlets (211); The cage column type transmission ring (7) comprises a final stage inner gear ring (702) rotatably mounted at the top edge of the hollow cylindrical shell (3) and a plurality of bending ribs (701) mounted in an equidistant annular array at the top of the final stage inner gear ring (702), wherein the top of the bending rib (701) extends upward and is fixedly connected to the bottom end of the impeller (203) through the air inlet (2011); the hollow cylindrical shell (3) comprises a top plate (302) fixed at the bottom end of the lower cylinder seat (103), a top plate ( The middle shell (301) is fixed at the bottom end of the middle shell (302) and the bottom plate (303) is installed at the edge of the bottom end of the middle shell (301). The outer wall of the middle shell (301) is provided with three hollow grooves (304) with equal spacing. The bottom end of the final stage inner gear ring (702) is rotatably connected to the top end of the top plate (302). The planetary gear transmission structure (6) includes a middle shaft (601) rotatably installed at the center position of the top end of the bottom plate (303), a surface of the middle shaft (601) The first gear (605) and the third gear (606) are fixed at both ends of the surface, and three side shafts (602) are rotatably mounted at the top edge of the bottom plate (303). One end of the surface of the side shaft (602) is fixed with a second gear (603) for engaging with the first gear (605). The lower end of one of the side shafts (602) is fixedly connected to the top of the driving shaft of the stepping motor (4), and the bottom ends of the other two side shafts (602) extend to the bottom plate (30 3) and is connected to the axial flow blowing assembly (5), a driven gear shaft (604) is rotatably mounted on the top end of the top plate (302), and the driven gear shaft (604) is engaged with the third gear (606) and the final stage inner gear ring (702), and a through hole for the liquid inlet elbow (1031) to pass through is provided on one side of the interior of the top plate (302), the middle shell (301), and the bottom plate (303), and the stepping motor (4) is mounted on one side of the bottom end of the bottom plate (303).

2. A self-cooling hydraulic cylinder according to claim 1, characterized in that: A plurality of ribs (1011) extending in the axial direction are integrally formed on the outer wall of the outer cylinder (101).

3. A self-cooling hydraulic cylinder according to claim 2, characterized in that: An inner support ring (8) is fixed at the top opening of the casing (201), and an annular support rim (801) is integrally formed at the outer edge of the inner support ring (8). An inverted L-shaped ring edge (2031) is integrally formed at the outer edge of the top of the impeller (203), and the inverted L-shaped ring edge (2031) and the annular support rim (801) are mutually engaged and maintain a sliding connection state.

4. A self-cooling hydraulic cylinder according to claim 3, characterized in that: The axial flow blowing assembly (5) comprises an axial flow fan (501) mounted on one side of the bottom end of the base plate (303), an air outlet pipe (502) on the bottom end of the air outlet of the axial flow fan (501), and a flat air nozzle (503) mounted on one end of the air outlet pipe (502) away from the axial flow fan (501), wherein the bottom ends of the two side shafts (602) are fixedly connected to the center points of the internal fan blades of the axial flow fan (501).

5. A method for operating a self-cooling hydraulic cylinder, comprising the self-cooling hydraulic cylinder according to claim 4, characterized in that: The following steps are involved: S101: During the operation of the hydraulic cylinder (1), the stepper motor (4) is turned on to work synchronously. The driving shaft of the stepper motor (4) outputs rotary power to the planetary gear transmission structure (6) in the hollow cylindrical shell (3). The planetary gear transmission structure (6) transmits power to the driven centrifugal heat removal assembly (2) through the cage-type transmission ring (7). The driven centrifugal heat removal assembly (2) rotates at high speed to perform heat dissipation. The driven centrifugal heat removal assembly (2) accelerates and ejects air along the tangential direction of the outer wall of the hydraulic cylinder (1), directly destroying the hot air layer retained on the surface of the cylinder body, establishing high-intensity convection heat exchange, and forming a low-pressure area in the center of the driven centrifugal heat removal assembly (2). The external cold air is sucked in axially from both ends of the cylinder body and runs through the entire length of the cylinder body to eliminate local high-temperature points. S102: During the heat dissipation process, each axial flow blowing assembly (5) receives the rotational power from the stepping motor (4) through the planetary gear transmission structure (6). The axial flow blowing assembly (5) blows out the air at high speed in a specific direction and forms a directional cold air flow to the stepping motor (4), thereby increasing the contact area between the air and the surface of the stepping motor (4). At the same time, since the air inlet of the axial flow blowing assembly (5) is oriented toward the hollow cylindrical shell (3), the planetary gear transmission structure (6) and the hydraulic cylinder (1), part of the intake air flow passes through the hollow structure of the hollow cylindrical shell (3), thereby forcibly cooling the meshing surface of the planetary gear transmission structure (6); S103: During the cooling process, regularly check the lubricating oil condition of the planetary gear transmission structure (6) in the hollow cylindrical shell (3) to ensure normal lubrication and avoid increased mechanical friction and heat generation due to poor lubrication; S104: After the hydraulic cylinder (1) stops working, the rotation speed of the stepper motor (4) is reduced to gradually reduce the rotation speed of the driven centrifugal heat exhaust assembly (2) and the axial flow blowing assembly (5), so that the hydraulic cylinder (1) gradually returns to a normal temperature state.

Images