Swing oil cylinder with high-strength supporting heat dissipation structure for overhead working truck

Abstract

The utility model provides an oscillating oil cylinder with a high-strength support heat dissipation structure for an overhead working truck, which is provided with an outer shell, a main shaft is arranged in the outer shell, and a bearing is fixedly arranged between the outer circumference of the left side of the main shaft and the inner circumference of the left side of the outer shell. A right rotary supporting shaft sleeve is fixedly arranged on the outer circumference of the right side of the main shaft, a bearing is fixedly arranged between the outer circumference of the right rotary supporting shaft sleeve and the inner circumference of the right side of the outer shell, and oil cavities are formed among the outer shell, the main shaft, the right rotary supporting shaft sleeve and the bearing and comprise the left oil cavity and the right oil cavity. And the two bearings are respectively communicated with the left oil cavity and the right oil cavity. The bearings are installed on the left side and the right side of the swing oil cylinder respectively, the bearings make direct contact with the oil cavity, during work, the temperature of the bearings and the temperature of adjacent components can be continuously reduced while oil circulates, and the technical problem that components in the oil cylinder generate high-temperature heating can be solved. The swing oil cylinder can be widely applied to swing oil cylinders.

Description

TECHNICAL FIELD

[0001] The utility model relates to a swing oil cylinder, in particular to a swing oil cylinder with high-strength support heat dissipation structure for aerial work truck. BACKGROUND

[0002] The swing oil cylinder is a kind of hydraulic device that can convert hydraulic energy into rotary motion, and is widely used in occasions requiring limited rotary motion and large torque.

[0003] However, most of the current swing oil cylinders are facing the problem of high temperature heating of internal related components due to long-term high-load operation, especially the position close to the left and right sides of the oil cylinder, because the position cannot be directly contacted with oil.

[0004] When the internal components are under the action of high temperature for a long time, the sealing effect of the oil seal ring will be damaged, directly leading to the problem of oil leakage of the swing oil cylinder. Long-term oil leakage will cause wear between the internal related rotating components of the swing oil cylinder, eventually reducing the overall service life of the oil cylinder. When the swing oil cylinder is applied to a relatively sealed working environment, the problem of high temperature heating is particularly serious. SUMMARY

[0005] The utility model provides a swing oil cylinder with high-strength support heat dissipation structure for aerial work truck, which is provided with bearings on the left and right sides of the swing oil cylinder, and the bearings are directly contacted with the oil cavity. During the operation of the swing oil cylinder, the hydraulic oil circulates between the oil cavity and the hydraulic station, which continuously reduces the temperature of the bearings and their adjacent components, avoids the problem of high temperature heating of the internal components of the oil cylinder, reduces the maintenance cost, and improves the overall service life of the swing oil cylinder.

[0006] Therefore, the technical scheme of the utility model is a swing oil cylinder with high-strength support heat dissipation structure for aerial work truck, which is provided with an outer shell, a main shaft is arranged in the inner part of the outer shell, and the main shaft is rotationally connected with the outer shell.

[0007] The outer shell is composed of an outer shell left segment, an outer shell middle segment and an outer shell right segment, and a stepped support surface is arranged between the outer shell left segment and the outer shell right segment in the inner part of the outer shell middle segment.

[0008] The outer shell is provided with a left oil hole and a right oil hole.

[0009] The main shaft is composed of a main shaft left side shaft segment, a main shaft middle shaft segment and a main shaft right side shaft segment, and a rotary sealing segment and a rotary support segment are arranged on the main shaft left side shaft segment from outside to inside, a right side rotary support shaft sleeve is arranged on the outer circumference of the main shaft right side shaft segment, and a rotary sealing segment and a rotary support segment are arranged on the right side rotary support shaft sleeve from outside to inside.

[0010] The shaft shoulder is arranged between the rotary sealing section and the rotary supporting section;

[0011] The two rotary sealing sections are respectively in rotary sealing connection with the axially outer positions on the left section of the outer shell and the right section of the outer shell;

[0012] The two rotary supporting sections are respectively arranged with bearings between the axially inner positions on the left section of the outer shell and the right section of the outer shell, the inner rings of the two bearings are respectively fixedly connected with the two rotary supporting sections, and the outer rings of the two bearings are respectively fixedly connected with the axially inner positions on the left section of the outer shell and the right section of the outer shell;

[0013] The outer side ends of the inner rings of the two bearings are respectively axially abutted with the two shaft shoulders, and the inner side ends of the outer rings of the two bearings are respectively axially abutted with the two stepped supporting surfaces;

[0014] The oil cavity is formed between the outer shell, the main shaft, the right rotary supporting sleeve and the bearings, and the oil cavity is in communication with the two bearings;

[0015] The driving piston and the inner tooth ring are arranged between the intermediate shaft section of the main shaft and the intermediate section of the outer shell from inside to outside in sequence, the inner circumference and the outer circumference on the one side of the driving piston in the axial direction are respectively in rotary sealing connection with the outer circumference of the intermediate shaft section of the main shaft and the inner circumference of the intermediate section of the outer shell, the inner circumference and the outer circumference on the other side of the driving piston in the axial direction are respectively in meshing rotary connection with the outer circumference of the intermediate shaft section of the main shaft and the inner circumference of the inner tooth ring, and the outer circumference of the inner tooth ring is fixedly connected with the inner circumference of the intermediate shaft section of the main shaft;

[0016] The driving piston divides the oil cavity into a left oil cavity and a right oil cavity, and the left oil cavity and the right oil cavity are respectively in communication with the left oil hole and the right oil hole;

[0017] The left oil cavity and the right oil cavity are respectively in communication with the bearings on the left side and the right side.

[0018] Preferably, the two bearings are tapered bearings, and the outer side ends of the outer rings of the two tapered bearings are respectively arranged with gap holes between the inner side ends of the two rotary sealing sections.

[0019] Preferably, the widths of the two gap holes are both 2.5mm-3.2mm.

[0020] Preferably, the inner side positions of the outer circumferences of the two rotary sealing sections are respectively arranged with grooves, oil liquid sealing rings are arranged in the grooves, and the inner side positions of the two rotary sealing sections are respectively in rotary sealing connection with the left section of the outer shell and the right section of the outer shell through the oil liquid sealing rings.

[0021] Preferably, the number of the oil liquid sealing rings of the outer circumferences of the two rotary sealing sections is respectively two.

[0022] Preferably, the outer sides of the outer circumference of the two rotary sealing sections are respectively provided with grooves, and dustproof sealing rings are provided in the grooves. The outer sides of the two rotary sealing sections are respectively rotary sealed to the left section and the right section of the outer shell through the dustproof sealing rings.

[0023] Preferably, the driving piston consists of a driving piston rotating sealing section, a driving piston meshing rotating section, and a driving piston connecting section. The driving piston rotating sealing section is located at the left section of the driving piston, the driving piston meshing rotating section is located at the right section of the driving piston, and the driving piston connecting section is located at the middle section of the driving piston.

[0024] The inner and outer circumferences of the rotating sealing section of the drive piston are respectively provided with grooves, and oil sealing rings are provided in the grooves. The inner and outer circumferences of the rotating sealing section of the drive piston are respectively connected to the outer circumference of the intermediate shaft section of the main shaft and the inner circumference of the intermediate section of the outer shell through the oil sealing rings. The rotating sealing section of the drive piston is located on the left side of the inner toothed ring.

[0025] The inner and outer circumferences of the drive piston meshing rotation section are respectively threadedly meshed and rotated with the outer circumference of the intermediate shaft section of the main shaft and the inner circumference of the internal gear ring.

[0026] Preferably, a guide slope is provided on the left side of the outer circumference of the internal gear ring. The guide slope is a slope that is lower on the left and higher on the right, and the right oil hole is located on the guide slope near the right slope.

[0027] Preferably, the outer casing has an oil filling hole and an oil releasing hole that penetrate through the inside and outside on the left and right sides respectively, and the oil filling hole and the oil releasing hole are located between the dustproof sealing ring and the adjacent oil sealing ring on the left and right sides respectively.

[0028] The beneficial effects of this utility model are:

[0029] 1. By installing bearings on both sides of the swing cylinder, during actual operation, when hydraulic oil enters the left oil chamber through the left oil hole, it fills the gap on the outside of the bearing on the left, forming a soaking coverage. Then, as the amount of hydraulic oil in the left oil chamber gradually increases, under pressure, the hydraulic oil pushes the drive piston to rotate and translate the sealing section to the right. Simultaneously, the drive piston rotates and translates the sealing section to the right, causing the main shaft to rotate forward. At this time, the heat generated by the main shaft driving the bearing to rotate is continuously transferred to the oil in the left oil chamber through the bearing. When hydraulic oil enters the right oil chamber through the right oil hole, it fills the gap on the outside of the bearing on the right, similarly forming a soaking coverage. Then, as the amount of hydraulic oil in the right oil chamber gradually increases, under pressure, the hydraulic oil pushes the drive piston to rotate and translate the sealing section to the left. At this time, the hydraulic oil in the left oil chamber returns through the left oil hole. As the hydraulic oil flows into the hydraulic station, the hydraulic oil in the left oil chamber carries away the heat during its return flow, thus cooling the cylinder. Simultaneously, as the piston rotates and the sealing section moves to the left, the main shaft rotates in the opposite direction. The heat generated by the main shaft rotating the bearing is continuously transferred to the hydraulic oil in the right oil chamber through the bearing. When the hydraulic oil re-enters the left oil chamber and pushes the piston to rotate and the sealing section to the right, the hydraulic oil in the right oil chamber flows back to the hydraulic station through the right oil hole. During this return flow, the hydraulic oil in the right oil hole carries away the heat from the right oil chamber, further cooling the cylinder. The repeated rotation of the main shaft continuously reduces the temperature in both oil chambers. During prolonged rotation, this reduces the overall temperature of the swing cylinder, effectively preventing overheating of internal components, reducing maintenance costs, and extending the overall service life of the swing cylinder.

[0030] Furthermore, by installing bearings on the left and right sides of the swing cylinder, on the one hand, due to the stability of the bearing structure itself, it can ensure that the spindle will not have obvious rotational clearance under long-term high-load rotation, thus improving the accuracy of the swing cylinder's long-term rotation operation. On the other hand, since the oil in the left and right oil chambers can immerse and cover the two bearings, it can continuously ensure the smoothness of the bearing rotation, further improving the swing accuracy of the swing cylinder.

[0031] 2. Since both bearings are tapered bearings, there are gap holes between the outer ends of the outer rings of the two tapered bearings and the inner ends of the two rotating sealing sections. During cylinder operation, when hydraulic oil enters the left oil chamber from the left oil hole, the oil will enter the gap holes along the gaps between the inner and outer rings of the bearing and the gaps between the inner and outer rings of the bearing and the left shaft section of the main shaft and the left section of the outer casing, respectively. Finally, the oil will envelop the bearing, reducing the temperature of the bearing itself and the temperature of the adjacent positions around the bearing. This can directly solve the problem of continuous high temperature in the cylinder near the left and right sides during operation, and extend the service life of the internal components of the cylinder. Attached Figure Description

[0032] Figure 1 This is a perspective view of the utility model;

[0033] Figure 2 This is the front view of this utility model;

[0034] Figure 3 This is a utility model Figure 2 Sectional view of AA;

[0035] Figure 4 This is a utility model Figure 3 Enlarged view at point B in the middle;

[0036] Figure 5 This is a utility model Figure 3 Enlarged view at point C;

[0037] Figure 6 This is a cross-sectional view of the outer shell structure in this utility model;

[0038] Figure 7 This is a structural diagram of the installation of the main shaft and the right-side rotary support bushing in this utility model.

[0039] Explanation of symbols in the diagram:

[0040] 1. Outer shell; 101. Left section of outer shell; 102. Middle section of outer shell; 103. Right section of outer shell; 104. Stepped support surface; 105. Oil injection hole; 106. Oil release hole; 2. Main spindle; 201. Left section of main spindle; 201. Rotary sealing section; 201. Rotary support section; 202. Middle section of main spindle; 203. Right section of main spindle; 3. Right side rotary support bushing; 301. Rotary sealing section; 302. Rotary support section; 4. Drive piston; 401. Drive piston rotary sealing section; 402. Drive piston meshing rotary section; 403. Drive piston connecting section; 5. Internal gear ring; 501. Guide slope; 6. Bearing; 7. Clearance hole; 8. Oil seal ring; 9. Left oil hole; 10. Right oil hole; 11. Oil cavity; 1101. Left oil cavity; 1102. Right oil cavity; 12. Dustproof seal ring; 13. Shoulder; 14. Groove; 15. Rotary sealing section; 16. Rotary support section. Detailed Implementation

[0041] The present invention will be further described below with reference to the embodiments.

[0042] pass Figures 1-7 It can be seen that the swing cylinder for the aerial work vehicle with a high-strength support and heat dissipation structure has an outer shell 1, and a main shaft 2 is provided inside the outer shell 1. The main shaft 2 is rotatably connected to the outer shell 1, and the main shaft 2 can rotate in both directions inside the outer shell 1.

[0043] The outer shell 1 is composed of a left section 101, a middle section 102, and a right section 103. The interior of the outer shell is provided with stepped support surfaces 104 between the middle section 102 and the left section 101 and the right section 103, respectively.

[0044] The outer casing 1 is provided with a left oil hole 9 and a right oil hole 10. The outer oil ports of the left oil hole 9 and the right oil hole 10 can be connected to the corresponding oil holes of the hydraulic station to realize oil transmission.

[0045] The main spindle 2 is composed of a left spindle section 201, a middle spindle section 202, and a right spindle section 203. The left spindle section 201 is provided with a rotary sealing section 15 and a rotary support section 16 from the outside to the inside. The outer circumference of the right spindle section 203 is provided with a right rotary support bushing 3. The right rotary support bushing 3 is provided with a rotary sealing section 15 and a rotary support section 16 from the outside to the inside. A shoulder 13 is provided between the rotary sealing section 15 and the rotary support section 16.

[0046] The two rotary sealing sections 15 are respectively rotary sealed to the axial outer positions of the left section 101 and the right section 103 of the outer casing.

[0047] Two rotating support sections 16 are respectively provided with bearings 6 between the left section 101 and the right section 103 of the outer shell. The inner rings of the two bearings 6 are fixedly connected to the two rotating support sections 16, and the outer rings of the two bearings 6 are fixedly connected to the axial inner positions of the left section 101 and the right section 103 of the outer shell. Furthermore, the outer ends of the inner rings of the two bearings 6 are axially engaged with the two shoulders 13, and the inner ends of the outer rings of the two bearings 6 are axially engaged with the two stepped support surfaces 104, thereby achieving a 360-degree axial and radial fixed connection of the bearings 6.

[0048] An oil cavity 11 is formed between the outer shell 1, the main shaft 2, the right-side rotating support bushing 3, and the bearing 6. The oil cavity 11 is connected to the two bearings 6.

[0049] A drive piston 4 and an internal gear ring 5 are sequentially arranged from the inside to the outside between the intermediate shaft section 202 of the main shaft and the intermediate section 102 of the outer shell. The inner and outer circumferences on one axial side of the drive piston 4 are rotatably and sealingly connected to the outer circumference of the intermediate shaft section 202 and the inner circumference of the intermediate section 102 of the outer shell, respectively. The inner and outer circumferences on the other axial side of the drive piston 4 are meshing and rotatably connected to the outer circumference of the intermediate shaft section 202 and the inner circumference of the internal gear ring 5, respectively. The outer circumference of the internal gear ring 5 is fixedly connected to the inner circumference of the intermediate shaft section 202 of the main shaft. The drive piston 4 divides the oil chamber 11 into a left oil chamber 1101 and a right oil chamber 1102. The left oil chamber 1101 and the right oil chamber 1102 are connected to the left oil hole 9 and the right oil hole 10, respectively. When the cylinder is in operation, the hydraulic oil enters the interior of the left oil chamber 1101 and the right oil chamber 1102 through the left oil hole 9 and the right oil hole 10, respectively, to realize the circulation and transmission of the oil.

[0050] The left oil chamber 1101 and the right oil chamber 1102 are connected to the bearings 6 on the left and right sides respectively. During the circulation of hydraulic oil in the left oil chamber 1101 and the right oil chamber 1102, the hydraulic oil will carry away the heat on the bearings 6, thereby reducing the bearing temperature.

[0051] Regarding the specific structure of bearing 6, in this patent, the two bearings 6 are tapered bearings. The outer ends of the outer rings of the two tapered bearings are respectively provided with gap holes 7 between the inner ends of the two rotating sealing sections 15. During the operation of the hydraulic cylinder, when hydraulic oil enters the left oil chamber 1101 from the left oil hole 9, the oil will enter the gap holes 7 along the gap between the inner and outer rings of the bearing 6 and the gaps between the inner and outer rings of the bearing and the left shaft section 201 of the main shaft and the left section 101 of the outer shell. Finally, the oil forms a wrapping immersion on the bearing 6, which reduces the temperature of the bearing 6 itself and also reduces the temperature of the adjacent positions around the bearing 6. This can directly solve the problem of continuous high temperature in the position near the left and right sides of the hydraulic cylinder during operation, and extend the service life of the internal components of the hydraulic cylinder.

[0052] The width of both clearance holes 7 is 2.5mm-3.2mm. If the clearance is too large, the hydraulic oil in the clearance hole 7 will form turbulence when the spindle 2 rotates. The long-term turbulence will cause the spindle 2 to vibrate to varying degrees. If the clearance is too small, it will increase the noise when the spindle 2 rotates. In addition, during the long-term high-load operation of the oil cylinder, the bearing 6 will inevitably vibrate slightly. If the clearance is too small, it will cause the outer ring of the bearing 6 to rub and collide with the rotating sealing section 15, causing impact damage and reducing the service life of the oil cylinder.

[0053] The inner sides of the outer circumference of the two rotary sealing sections 15 are respectively provided with grooves 14, and oil sealing rings 8 are provided in the grooves 14. The inner sides of the two rotary sealing sections 15 are respectively connected to the left section 101 and the right section 103 of the outer shell through the oil sealing rings 8 for rotary sealing, which can prevent the hydraulic oil in the oil cavity 11 from leaking outward.

[0054] The two rotating sealing sections 15 each have two oil sealing rings 8 on their outer circumference. This design is mainly for the oil sealing on the left side of the main shaft section 201. In actual use, since the left side of the main shaft section 201 is the main support end of the aerial work platform, the service life of the oil sealing rings 8 on the outer circumference of the main shaft section 201 is significantly lower than that of the oil sealing rings 8 on the outer circumference of the right rotating support bushing 3 during the long-term and frequent rotation of the aerial work platform controlled by the swing cylinder is increased. Therefore, the number of oil sealing rings 8 on the outer circumference of both rotating sealing sections 15 is increased to two. This ensures the sealing effect on the left side of the main shaft section 201 and also strengthens the sealing effect on the right side of the rotating support bushing 3, thereby further extending the overall service life of the swing cylinder.

[0055] The outer sides of the outer circumference of the two rotary sealing sections 15 are respectively provided with grooves 14, and dustproof sealing rings 12 are provided in the grooves 14. The outer sides of the two rotary sealing sections 15 are respectively connected to the left section 101 and the right section 103 of the outer shell through the dustproof sealing rings 12. The dustproof sealing rings 12 serve as the outermost protection of the swing cylinder, which can prevent dust and foreign objects in the external environment from entering the cylinder and causing damage to related components.

[0056] The drive piston 4 consists of a drive piston rotary sealing section 401, a drive piston meshing rotary section 402, and a drive piston connecting section 403. The drive piston rotary sealing section 401 is located on the left side of the drive piston 4, the drive piston meshing rotary section 402 is located on the right side of the drive piston 4, and the drive piston connecting section 403 is located in the middle of the drive piston 4. The inner and outer circumferences of the drive piston rotary sealing section 401 are respectively provided with grooves 14, and oil sealing rings 8 are provided in the grooves 14. The inner and outer circumferences of the drive piston rotary sealing section 401 are rotary sealed to the outer circumference of the main shaft intermediate section 202 and the inner circumference of the outer casing intermediate section 102 through the oil sealing rings 8. The drive piston rotary sealing section 401 is located on the left side of the inner toothed ring 5.

[0057] The oil seal ring 8 can isolate the hydraulic oil entering the left and right oil chambers, ensuring that the hydraulic oil in the left and right oil chambers has sufficient and stable hydraulic thrust on the drive piston 4, thereby realizing the stable rotation and translation of the drive piston 4.

[0058] The inner and outer circumferences of the drive piston meshing rotation section 402 are respectively threadedly meshed and rotated with the outer circumference of the main shaft intermediate shaft section 202 and the inner circumference of the internal gear ring 5.

[0059] A guide slope 501 is provided on the left side of the outer circumference of the internal gear ring 5. The guide slope 501 is a slope that is lower on the left and higher on the right. The right oil hole 10 is located on the guide slope 501 near the right slope.

[0060] When the hydraulic oil enters through the right oil hole 10, it first contacts the guide slope 501. Under the guidance of the slope of the guide slope 501, the hydraulic oil is diverted to the left. On the one hand, it plays a certain role in oil buffering, which can avoid the hydraulic oil from having a straight impact on the drive piston 4. If the drive piston 4 is subjected to a straight impact for a long time, it will cause the drive piston 4 to have a rotation gap and cause varying degrees of damage to the drive piston 4. On the other hand, it can shorten the action delay of the drive piston 4. The hydraulic oil guided to the left by the guide slope 501 directly acts on the right side of the drive piston rotation sealing section 401, realizing the rapid leftward rotation and translation of the drive piston 4.

[0061] Regarding the specific fixing method of the two bearings 6, in this patent, the inner and outer circumferences of the two bearings 6 are fixedly connected to the outer circumferences of the two rotating support sections 16 and the inner circumferences of the left section 101 and the right section 103 of the outer shell by spot welding. Spot welding can increase the firmness of the bearings 6, and ultimately ensure the swing accuracy and stability of the hydraulic cylinder during operation. Other fixing methods can also be used, such as pin insertion or set screw fixing, which can achieve quick assembly and disassembly.

[0062] The outer casing 1 has an oil filling hole 105 and an oil releasing hole 106 on its left and right sides, respectively, which are through-holes. A plug is installed on the outer port of each oil filling hole 105 and oil releasing hole 106. The oil filling hole 105 and oil releasing hole 106 are located between the dustproof sealing ring 12 and the adjacent oil sealing ring 8 on the left and right sides, respectively. Since the dustproof sealing ring 12 and the adjacent oil sealing ring 8 cannot contact the oil during cylinder operation, they are prone to wear under prolonged rotation. Therefore, the oil filling hole 105 and oil releasing hole are provided between the dustproof sealing ring 12 and the adjacent oil sealing ring 8. 106. The operator injects lubricating oil, such as grease, into the cylinder through the oil filling hole 105. This lubricates the dust seal 12 and the adjacent oil seal 8, minimizing wear on the dust seal 12 and the oil seal 8 and extending their service life. In addition, after the cylinder has been running for a period of time, the lubricating oil in this area will become contaminated to varying degrees and needs to be replaced. At this time, the lubricating oil inside can be drained through the oil release hole 106, and then new lubricating oil can be added again through the oil filling hole 105 to ensure the sealing performance of the dust seal 12 and the oil seal 8.

[0063] When the swing cylinder is in operation, after hydraulic oil enters the left oil chamber 1101 through the left oil hole 9, the hydraulic oil fills the gap on the outside of the left bearing 6, forming an immersion-like coverage on the bearing 6. Then, as the amount of hydraulic oil in the left oil chamber 1101 gradually increases, under pressure, the hydraulic oil pushes the drive piston to rotate and translate the sealing section 401 to the right. At the same time, the drive piston rotates and translates the sealing section 401 to the right, driving the main shaft 2 to rotate in the forward direction. At this time, the main shaft 2 drives the bearing 6 to rotate, producing... The generated heat will continuously be transferred to the oil in the left oil chamber 1101 through the bearing 6. When the hydraulic oil enters the right oil chamber 1102 through the right oil hole 10, the hydraulic oil will fill the gap on the outside of the right bearing 6, thus forming a soaking coverage on the bearing 6. Then, as the amount of hydraulic oil in the right oil chamber 1102 gradually increases, under the action of pressure, the hydraulic oil pushes the drive piston to rotate and translate the sealing section 401 to the left. At this time, the hydraulic oil in the left oil chamber 1101 will flow back to the hydraulic station through the left oil hole 9. During the recirculation process, the hydraulic oil in the left oil chamber 1101 carries away the heat from the left oil chamber 1101, thus achieving a cooling effect. Simultaneously, as the piston rotates and the sealing section 401 rotates and translates to the left, the main shaft 2 rotates in the opposite direction. At this time, the heat generated by the rotation of the bearing 6 by the main shaft 2 is continuously transferred to the hydraulic oil in the right oil chamber 1102 through the bearing 6. When the hydraulic oil re-enters the left oil chamber 1101, pushing the piston to rotate and translate to the right, the hydraulic oil in the right oil chamber 1102 flows back to the hydraulic station through the right oil hole 10. During the recirculation process, the hydraulic oil in the right oil hole 10 carries away the heat from the right oil chamber 1102, achieving a cooling effect. Under the repeated rotation of the main shaft 2, the temperature in both oil chambers can be continuously reduced. During prolonged rotational operation, the overall temperature of the swing cylinder can be reduced, effectively preventing overheating of internal components during long-term operation, reducing maintenance costs, and extending the overall service life of the swing cylinder.

[0064] Furthermore, by installing bearings 6 on the left and right sides of the swing cylinder, on the one hand, the stability of the bearing 6's own structure can increase the support strength and stability on both sides of the swing cylinder, ensuring that the main shaft 2 will not have obvious rotational clearance under long-term high-load rotation, thus improving the accuracy of the swing cylinder's long-term rotation operation. On the other hand, since the oil in the left and right oil chambers immerses and covers the two bearings 6, it can continuously ensure the smoothness of the bearings 6's rotation, further improving the swing accuracy of the swing cylinder.

[0065] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. An oscillating cylinder with high-strength support heat dissipation structure for an aerial work platform, characterized in that: The outer shell is internally provided with a main shaft which is rotationally connected with the outer shell; The outer shell is composed of a left section, a middle section and a right section, and the inner part of the middle section is provided with a stepped support surface between the left section and the right section; The outer shell is provided with left and right oil holes; The main shaft is composed of a left section, a middle section and a right section, and the left section is provided with a rotating sealing section and a rotating support section from outside to inside, and the right section is provided with a right rotating support sleeve, and the right rotating support sleeve is provided with a rotating sealing section and a rotating support section from outside to inside; The rotating sealing section and the rotating support section are provided with a shaft shoulder; The two rotating sealing sections are rotationally connected with the outer sides of the left section and the right section of the outer shell; The two rotating support sections are provided with bearings between the inner sides of the left section and the right section of the outer shell, the inner rings of the two bearings are fixedly connected with the two rotating support sections, and the outer rings of the two bearings are fixedly connected with the inner sides of the left section and the right section of the outer shell; The outer ends of the inner rings of the two bearings are axially attached to the two shaft shoulders, and the inner ends of the outer rings of the two bearings are axially attached to the two stepped support surfaces; The outer shell, the main shaft, the right rotating support sleeve and the bearings form an oil cavity which is in communication with the two bearings; The middle section of the main shaft and the middle section of the outer shell are sequentially provided with a driving piston and an inner ring from inside to outside, the inner and outer circumferences of one side of the driving piston are rotationally connected with the outer circumference of the middle section of the main shaft and the inner circumference of the middle section of the outer shell, the inner and outer circumferences of the other side of the driving piston are meshingly rotationally connected with the outer circumference of the middle section of the main shaft and the inner circumference of the inner ring, and the outer circumference of the inner ring is fixedly connected with the inner circumference of the middle section of the main shaft; The driving piston divides the oil cavity into a left oil cavity and a right oil cavity, and the left and right oil cavities are in communication with the left and right oil holes respectively; The left and right oil cavities are in communication with the bearings on the left and right sides respectively.

2. The swing cylinder with high-strength support heat dissipation structure for the aerial work vehicle according to claim 1, characterized in that: The two bearings are tapered bearings, and the outer ends of the outer rings of the two tapered bearings are provided with gap holes between the inner ends of the two rotating sealing sections.

3. The swing cylinder with high-strength support heat dissipation structure for the overhead working truck according to claim 2, characterized in that: The widths of the two gap holes are 2.5mm-3.2mm.

4. The swing cylinder with high-strength support heat dissipation structure for the aerial work vehicle according to claim 1, characterized in that: The inner sides of the outer circumferences of the two rotating sealing sections are provided with grooves, the grooves are provided with oil sealing rings, and the inner sides of the outer circumferences of the two rotating sealing sections are rotationally connected with the left section and the right section of the outer shell through the oil sealing rings.

5. The swing cylinder with high-strength support heat dissipation structure for the overhead working truck according to claim 4, characterized in that: The number of the oil sealing rings on the outer circumferences of the two rotating sealing sections is two.

6. The swing cylinder with high-strength support heat dissipation structure for the aerial work vehicle according to claim 5, characterized in that: The outer sides of the outer circumferences of the two rotating sealing sections are provided with grooves, the grooves are provided with dust sealing rings, and the outer sides of the outer circumferences of the two rotating sealing sections are rotationally connected with the left section and the right section of the outer shell through the dust sealing rings.

7. The swing cylinder with high-strength support heat dissipation structure for the overhead working truck according to claim 6, characterized in that: The left and right sides of the outer shell are respectively provided with oil injection holes and oil release holes which penetrate in and out, and the oil injection holes and the oil release holes are respectively located between the dustproof sealing rings and the adjacent oil sealing rings on the left and right sides.

8. The swing cylinder with high-strength support heat dissipation structure for the aerial work vehicle according to claim 1, characterized in that: The driving piston is composed of a driving piston rotating sealing section, a driving piston engaging rotating section and a driving piston connecting section, the driving piston rotating sealing section is located at the left section of the driving piston, the driving piston engaging rotating section is located at the right section of the driving piston, and the driving piston connecting section is located at the middle section of the driving piston. The inner and outer circumferences of the driving piston rotating sealing section are respectively provided with grooves, and the grooves are provided with oil sealing rings, the inner and outer circumferences of the driving piston rotating sealing section are respectively connected with the outer circumference of the middle shaft section of the main shaft and the inner circumference of the middle section of the outer shell through the oil sealing rings, and the driving piston rotating sealing section is located at the left side of the inner tooth ring. The inner and outer circumferences of the driving piston engaging rotating section are respectively threadingly engaged with the outer circumference of the middle shaft section of the main shaft and the inner circumference of the inner tooth ring.

9. The swing cylinder with high-strength support heat dissipation structure for overhead working truck according to claim 1, characterized in that: The left side of the outer circumference of the inner tooth ring is provided with a guide slope, the guide slope is a slope with a low left side and a high right side, and the right oil hole is located at a position close to the right side of the guide slope.

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