Hydraulic oscillating cylinder with built-in hydraulic oil circuit

Abstract

The hydraulic oscillating cylinder with the built-in hydraulic oil ways comprises an outer shell and an oil balance valve, the bottom end of the oil balance valve is fixedly connected with the outer portion of the outer shell, and a third hydraulic oil way and a fourth hydraulic oil way are arranged in the shell wall of the outer shell respectively. The oil balance valve is provided with a first hydraulic oil way and a second hydraulic oil way, and the first hydraulic oil way and the second hydraulic oil way communicate with outer side ports of the third hydraulic oil way and the fourth hydraulic oil way correspondingly. According to the hydraulic oscillating cylinder, the external oil pipe on one side of the oil outlet of the oil balance valve is completely arranged in the outer shell of the oscillating cylinder, and a hydraulic oil way is formed in the outer shell, so that the situation that the external oil pipe is damaged and leaks oil due to the fact that the external oil pipe is crashed and impacted can be avoided; the hydraulic oscillating cylinder can stably operate for a long time, the maintenance cost is reduced, and the service life is prolonged. The utility model can be widely applied to hydraulic oscillating cylinders.

Description

Technical Field

[0001] The utility model relates to a hydraulic swing cylinder, in particular to a hydraulic swing cylinder with a built-in hydraulic oil circuit. Background Art

[0002] A hydraulic swing cylinder is a device that converts hydraulic energy into rotational motion. It is widely used in areas requiring limited rotational motion and high torque. Its internal spiral structure can output high torque in a small space. It has the characteristics of compact structure, high torque, high precision, dust, dirt and moisture resistance.

[0003] In order to ensure the stability of oil transmission in the hydraulic swing cylinder, an oil balance valve is usually installed on the outside of the hydraulic swing cylinder housing. The oil inlet of the oil balance valve is connected to the hydraulic oil station, and the oil outlet of the oil balance valve is connected to the two oil holes on the swing cylinder housing through an external oil pipe. However, since the hydraulic swing cylinder usually operates in a harsh environment, the external oil pipe will inevitably be hit by pits and collisions, resulting in damage and oil leakage of the external oil pipe, which directly causes the hydraulic swing cylinder to fail to operate normally, increase maintenance costs, and shorten its service life. Utility Model Content

[0004] In response to the above technical problems, the utility model provides a hydraulic swing cylinder with a built-in hydraulic oil circuit. The hydraulic swing cylinder with a built-in hydraulic oil circuit has an external oil pipe on one side of the oil outlet of the oil balance valve completely built into the interior of the outer shell of the swing cylinder, forming a hydraulic oil circuit inside the outer shell, which can avoid the external oil pipe from being damaged or leaking due to pits and collisions, ensuring that the hydraulic swing cylinder can operate stably for a long time, reducing maintenance costs and extending service life.

[0005] To this end, the technical solution of the utility model is a hydraulic swing cylinder with a built-in hydraulic oil circuit, comprising an outer shell and an oil balance valve, wherein the bottom end of the oil balance valve is fixedly connected to the outside of the outer shell;

[0006] A third hydraulic oil circuit and a fourth hydraulic oil circuit are respectively provided inside the shell wall of the outer shell. One end of the third hydraulic oil circuit and the fourth hydraulic oil circuit respectively penetrates to the outside of the outer shell and is located at the bottom end of the oil balance valve. The other end of the third hydraulic oil circuit penetrates to the axial left side of the inner circumference of the outer shell. The other end of the fourth hydraulic oil circuit penetrates along the inside of the shell wall to the axial right side of the inner circumference of the outer shell.

[0007] One end portion of the oil balance valve is provided with a first oil hole of the balance valve and a second oil hole of the balance valve respectively;

[0008] A first hydraulic oil circuit and a second hydraulic oil circuit are respectively provided on the inner sides of the first oil hole and the second oil hole of the balancing valve, and the first oil hole and the second oil hole of the balancing valve are respectively communicated with the first hydraulic oil circuit and the second hydraulic oil circuit, and the other ends of the first hydraulic oil circuit and the second hydraulic oil circuit respectively pass through the outer side of the bottom end of the oil balancing valve and are respectively communicated with the outer side ports of the third hydraulic oil circuit and the fourth hydraulic oil circuit;

[0009] Preferably, a sealing fixing plane is provided on the outside of the outer shell at a position of the bottom end of the oil balancing valve, and the bottom end of the oil balancing valve is fixedly connected to the sealing fixing plane.

[0010] Preferably, the bottom ends of the oil balancing valves are respectively provided with grooves at the outer sides of the ports of the first hydraulic oil circuit and the second hydraulic oil circuit, and oil sealing rings are provided in the grooves. The first hydraulic oil circuit and the second hydraulic oil circuit are respectively sealed and connected to the third hydraulic oil circuit and the fourth hydraulic oil circuit through the oil sealing rings.

[0011] Preferably, the fourth hydraulic oil circuit includes a rear end transmission section of the fourth hydraulic oil circuit and a front end boosting section of the fourth hydraulic oil circuit, and the aperture of the rear end transmission section of the fourth hydraulic oil circuit is larger than the aperture of the front end boosting section of the fourth hydraulic oil circuit;

[0012] One end of the rear end transmission section of the fourth hydraulic oil circuit is connected to the second hydraulic oil circuit, the other end of the rear end transmission section of the fourth hydraulic oil circuit is connected to one end of the front end boosting section of the fourth hydraulic oil circuit, and the other end of the front end boosting section of the fourth hydraulic oil circuit is connected to the axial right side position of the inner circumference of the outer shell.

[0013] Preferably, the other end portion of the oil balancing valve is provided with a third oil hole and a fourth oil hole of the balancing valve, and the inner sides of the third oil hole and the fourth oil hole of the balancing valve are connected to the first hydraulic oil circuit and the second hydraulic oil circuit respectively.

[0014] Preferably, a main shaft is provided inside the outer shell, and the main shaft includes a main shaft left support section, a main shaft middle connecting section, and a main shaft right support section, and the main shaft left support section and the main shaft right support section are respectively located at the outermost position of the inner circumference of the outer shell;

[0015] A main shaft left support sleeve and a main shaft right support sleeve are respectively provided between the outer circumferences of the main shaft left support section and the main shaft right support section and the left and right inner circumferences of the outer shell. The outer circumferences of the main shaft left support sleeve and the main shaft right support sleeve are respectively rotated with the left and right inner circumferences of the outer shell, and the inner circumferences of the main shaft left support sleeve and the main shaft right support sleeve are respectively sealed and fixedly connected with the outer circumferences of the main shaft left support section and the main shaft right support section;

[0016] An inner gear ring and a rotary piston are respectively provided between the middle connecting section of the main shaft and the middle position of the inner circumference of the outer shell from the outside to the inside. The rotary piston includes a rotary piston rotary sealing section and a rotary piston meshing rotary section. The rotary piston rotary sealing section is located on the left side of the rotary piston, and the rotary piston meshing rotary section is located on the right side of the rotary piston.

[0017] The inner circumference of the rotary sealing section of the rotary piston is rotary sealedly connected to the outer circumference of the intermediate connecting section of the main shaft, and the outer circumference of the rotary sealing section of the rotary piston is rotary sealedly connected to the inner circumference of the outer shell;

[0018] The outer circumference of the inner gear ring is fixedly connected to the inner circumference of the outer shell, the inner circumference of the inner gear ring is meshed and rotationally connected to the outer circumference of the meshing rotating section of the rotary piston, and the inner circumference of the meshing rotating section of the rotary piston is meshed and rotationally connected to the outer circumference of the middle connecting section of the main shaft.

[0019] Preferably, an oil chamber is provided between the outer shell, the main shaft, the left support sleeve of the main shaft, and the right support sleeve of the main shaft. The rotating piston and the rotating seal section divide the oil chamber into a left oil chamber and a right oil chamber. The left oil chamber is connected to the inner port of the third hydraulic oil circuit, and the right oil chamber is connected to the inner port of the fourth hydraulic oil circuit.

[0020] Preferably, the outer circumferences of the left side support sleeve and the right side support sleeve of the main shaft are each provided with a plurality of grooves, and the plurality of grooves are respectively provided with a dustproof sealing ring, an oil sealing ring, and a wear-resistant support pad from the outside to the inside;

[0021] The inner circumferences of the main shaft left support sleeve and the main shaft right support sleeve are both provided with grooves, and oil sealing rings are provided in the grooves;

[0022] The outer circumference of the rotary sealing section of the rotary piston is provided with multiple grooves, in which oil sealing rings and wear-resistant support pads are respectively provided;

[0023] The inner circumference of the rotary sealing section of the rotary piston is provided with a plurality of grooves, and the grooves are respectively provided with oil sealing rings and wear-resistant support pads.

[0024] The beneficial effects of the utility model are:

[0025] 1. The hydraulic swing cylinder completely integrates the external oil pipe on the oil outlet side of the oil balance valve into the outer shell of the swing cylinder, forming a hydraulic oil circuit inside the outer shell. This can prevent the external oil pipe from being damaged or leaking due to pits and impacts, ensuring that the hydraulic swing cylinder can operate stably for a long time, reducing maintenance costs and extending its service life.

[0026] 2. Since the end of the third hydraulic oil circuit on one side of the oil chamber is closer to the oil balance valve, and the end of the fourth hydraulic oil circuit on one side of the oil chamber is farther from the oil balance valve, when oil of the same pressure enters the left oil chamber along the first hydraulic oil circuit and the third hydraulic oil circuit, and enters the right oil chamber along the second hydraulic oil circuit and the fourth hydraulic oil circuit, it is obvious that the oil pressure entering the right oil chamber is less than the oil pressure entering the left oil chamber. Therefore, the aperture of the front-end boosting section of the fourth hydraulic oil circuit at the front section of the fourth hydraulic oil circuit is set to be smaller than the aperture of the rear-end transmission section of the fourth hydraulic oil circuit, so that the oil entering the front-end boosting section of the fourth hydraulic oil circuit can be pressurized to ensure that the oil pressure entering the left and right oil chambers is equal, thereby ensuring that the left and right sides of the rotating piston are subjected to the same thrust, and ultimately improving the stability of the main shaft in the swing cylinder during forward and reverse rotation, and ensuring that the swing cylinder as a whole can operate stably for a long time.

[0027] 3. Since a sealing fixing plane is provided at the bottom end of the oil balancing valve on the outside of the outer shell, the bottom end of the oil balancing valve is fixedly connected to the sealing fixing plane, thereby realizing a fixed connection between the planes and increasing the firmness of the connection between the oil balancing valve and the outer shell, and since the bottom ends of the oil balancing valve are respectively provided with grooves at the outer sides of the ports of the first hydraulic oil circuit and the second hydraulic oil circuit, and oil sealing rings are provided in the grooves, the first hydraulic oil circuit and the second hydraulic oil circuit are respectively sealed and connected to the third hydraulic oil circuit and the fourth hydraulic oil circuit through the oil sealing rings, and combined with the planar contact between the bottom end of the oil balancing valve and the sealing fixing plane, the planar contact can better increase the sealing stability of the oil sealing ring compared to the arc surface contact, and prevent the oil entering from the first hydraulic oil circuit and the second hydraulic oil circuit or the oil discharged from the third hydraulic oil circuit and the fourth hydraulic oil circuit from leaking out from the gap between the bottom end of the oil balancing valve and the sealing fixing plane. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a three-dimensional diagram of the utility model;

[0029] Figure 2 It is another three-dimensional diagram of the utility model;

[0030] Figure 3 This is the main view of the utility model;

[0031] Figure 4 This utility model Figure 3 Middle AA section view;

[0032] Figure 5 This utility model Figure 3 Middle BB cross-section;

[0033] Figure 6 This utility model Figure 4Enlarged view of point C in the middle;

[0034] Figure 7 This utility model Figure 5 Enlarged view of point D in the middle;

[0035] Figure 8 This utility model Figure 5 Enlarged view of point E in the middle.

[0036] Explanation of symbols in the figure:

[0037] 1. Outer shell; 101. Sealing fixed surface; 2. Hydraulic balancing valve; 201. First oil hole of balancing valve; 202. Second oil hole of balancing valve; 203. Third oil hole of balancing valve; 204. Fourth oil hole of balancing valve; 3. Spindle; 301. Left support section of main shaft; 302. Middle connecting section of main shaft; 303. Right support section of main shaft; 4. Left support sleeve of main shaft; 5. Right support sleeve of main shaft; 6. First hydraulic oil circuit; 7. Second hydraulic circuit Oil circuit; 8. Fourth hydraulic oil circuit; 801. Rear-end transmission section of the fourth hydraulic oil circuit; 802. Front-end boost section of the fourth hydraulic oil circuit; 9. Third hydraulic oil circuit; 10. Rotary piston; 1001. Rotary piston rotary sealing section; 1002. Rotary piston meshing rotary section; 11. Internal gear ring; 12. Dustproof sealing ring; 13. Oil sealing ring; 14. Wear-resistant support pad; 16. Oil chamber; 1601. Left oil chamber; 1602. Right oil chamber. DETAILED DESCRIPTION

[0038] The present invention will be further described below in conjunction with the embodiments.

[0039] pass Figures 1-8 It can be seen that the hydraulic swing cylinder with a built-in hydraulic oil circuit includes an outer shell 1 and an oil balance valve 2 , and the bottom end of the oil balance valve 2 is fixedly connected to the outside of the outer shell 1 .

[0040] A third hydraulic oil circuit 9 and a fourth hydraulic oil circuit 8 are respectively provided inside the shell wall of the outer shell 1. One end of the third hydraulic oil circuit 9 and the fourth hydraulic oil circuit 8 respectively penetrate to the outside of the outer shell 1 and are located at the bottom end of the oil balance valve 2. The other end of the third hydraulic oil circuit 9 penetrates to the axial left position of the inner circumference of the outer shell 1 and is connected to the left oil chamber 1601. The other end of the fourth hydraulic oil circuit 8 penetrates along the inside of the shell wall to the axial right position of the inner circumference of the outer shell 1 and is connected to the right oil chamber 1602.

[0041] A first oil hole 201 and a second oil hole 202 of the balancing valve are provided on one side end of the oil balancing valve 2. The first oil hole 201 and the second oil hole 202 of the balancing valve are the oil inlets of the oil balancing valve 2 and are used to connect the hydraulic oil station. The first oil hole 201 and the second oil hole 202 of the balancing valve are respectively provided on the inner sides of the first oil hole 201 and the second oil hole 202 of the balancing valve. The first oil hole 201 and the second oil hole 202 of the balancing valve are respectively connected to the first hydraulic oil circuit 6 and the second hydraulic oil circuit 7. The other ends of the first hydraulic oil circuit 6 and the second hydraulic oil circuit 7 respectively pass through to the outside of the bottom end of the oil balancing valve 2 and are respectively connected to the outer ports of the third hydraulic oil circuit 9 and the fourth hydraulic oil circuit 8.

[0042] A sealing fixing plane 101 is provided on the outside of the outer shell 1 at the bottom end of the oil balancing valve 2. The bottom end of the oil balancing valve 2 is fixedly connected to the sealing fixing plane 101, thereby realizing a fixed connection between the planes and increasing the firmness of the connection between the oil balancing valve 2 and the outer shell 1. In addition, since the bottom end of the oil balancing valve 2 is respectively provided with grooves at the outer sides of the ports of the first hydraulic oil circuit 6 and the second hydraulic oil circuit 7, and an oil sealing ring 13 is provided in the groove, the first hydraulic oil circuit 6 and the second hydraulic oil circuit 7 are respectively sealed and connected to the third hydraulic oil circuit 9 and the fourth hydraulic oil circuit 8 through the oil sealing ring 13. Combined with the planar contact between the bottom end of the oil balancing valve 2 and the sealing fixing plane 101, compared with the arc surface contact, the planar contact can better increase the sealing stability of the oil sealing ring 13, thereby preventing the oil entering from the first hydraulic oil circuit 6 and the second hydraulic oil circuit 7 or the oil discharged from the third hydraulic oil circuit 9 and the fourth hydraulic oil circuit 8 from leaking outward from the gap between the bottom end of the oil balancing valve 2 and the sealing fixing plane 101.

[0043] The fourth hydraulic oil circuit 8 includes a fourth hydraulic oil circuit rear end transmission section 801 and a fourth hydraulic oil circuit front end boosting section 802. The aperture of the fourth hydraulic oil circuit rear end transmission section 801 is larger than the aperture of the fourth hydraulic oil circuit front end boosting section 802. One end of the fourth hydraulic oil circuit rear end transmission section 801 is connected to the second hydraulic oil circuit 7, and the other end of the fourth hydraulic oil circuit rear end transmission section 801 is connected to one end of the fourth hydraulic oil circuit front end boosting section 802. The other end of the fourth hydraulic oil circuit front end boosting section 802 is connected to the axial right side position of the inner circumference of the outer shell 1.

[0044] Since the end of the third hydraulic oil circuit 9 on the side of the oil chamber 16 is closer to the oil balance valve 2, and the end of the fourth hydraulic oil circuit 8 on the side of the oil chamber 16 is farther from the oil balance valve 2, when the oil of the same pressure enters the left oil chamber 1602 along the first hydraulic oil circuit 6 and the third hydraulic oil circuit 9, and enters the right oil chamber 1601 along the second hydraulic oil circuit 7 and the fourth hydraulic oil circuit 8, it is obvious that the oil pressure entering the right oil chamber 1601 is less than the oil pressure entering the left oil chamber 1602. Therefore, by setting the aperture of the front-end boosting section 802 of the fourth hydraulic oil circuit at the front section of the fourth hydraulic oil circuit 8 to be smaller than the aperture of the rear-end transmission section 801 of the fourth hydraulic oil circuit, the oil entering the front-end boosting section 802 of the fourth hydraulic oil circuit can be pressurized to ensure that the oil pressures entering the left oil chamber 1602 and the right oil chamber 1601 are equal, thereby ensuring that the left and right sides of the rotating piston 10 are subjected to the same thrust, and ultimately improving the stability of the main shaft in the swing cylinder during forward and reverse rotation, and ensuring that the swing cylinder as a whole can operate stably for a long time.

[0045] The other end portion of the oil balancing valve 2 is provided with a third oil hole 203 and a fourth oil hole 204 of the balancing valve, and the inner sides of the third oil hole 203 and the fourth oil hole 204 of the balancing valve are connected to the first hydraulic oil circuit 6 and the second hydraulic oil circuit 7 respectively.

[0046] from Figure 1 It can be seen that the first oil hole 201 of the balancing valve and the second oil hole 202 of the balancing valve are located at the left end of the oil balancing valve 2, and the third oil hole 203 of the balancing valve and the fourth oil hole 204 of the balancing valve are located at the upper end of the oil balancing valve 2. They can be selected for use according to the actual installation situation to avoid interference with the oil pipe installation.

[0047] A main shaft 3 is provided inside the outer shell 1. The main shaft 3 includes a left side support section 301, a middle connection section 302, and a right side support section 303. The left side support section 301 and the right side support section 303 are respectively located at the outermost position of the inner circumference of the outer shell 1.

[0048] A main shaft left support sleeve 4 and a main shaft right support sleeve 5 are respectively provided between the outer circumferences of the main shaft left support section 301 and the main shaft right support section 303 and the left and right inner circumferences of the outer shell 1. The outer circumferences of the main shaft left support sleeve 4 and the main shaft right support sleeve 5 are respectively rotationally sealed with the left and right inner circumferences of the outer shell 1, and the inner circumferences of the main shaft left support sleeve 4 and the main shaft right support sleeve 5 are respectively sealed and fixedly connected with the outer circumferences of the main shaft left support section 301 and the right shaft support section 303. This structure can effectively prevent the oil in the cylinder from leaking out through the corresponding gaps.

[0049] An inner gear ring 11 and a rotary piston 10 are respectively provided between the middle connecting section 302 of the main shaft and the middle position of the inner circumference of the outer shell 1 from the outside to the inside. The rotary piston 10 includes a rotary piston rotating sealing section 1001 and a rotary piston meshing rotating section 1002. The rotary piston rotating sealing section 1001 is located on the left side of the rotary piston 10, and the rotary piston meshing rotating section 1002 is located on the right side of the rotary piston 10.

[0050] The inner circumference of the rotary piston rotary sealing section 1001 is rotary sealedly connected to the outer circumference of the main shaft intermediate connecting section 302 , and the outer circumference of the rotary piston rotary sealing section 1001 is rotary sealedly connected to the inner circumference of the outer shell 1 .

[0051] The outer circumference of the inner gear ring 11 is fixedly connected to the inner circumference of the outer shell 1, the inner circumference of the inner gear ring 11 is meshed and rotationally connected to the outer circumference of the rotary piston meshing rotating section 1002, and the inner circumference of the rotary piston meshing rotating section 1002 is meshed and rotationally connected to the outer circumference of the main shaft intermediate connecting section 302.

[0052] An oil chamber 16 is provided between the outer shell 1, the main shaft 3, the left main shaft support sleeve 4, and the right main shaft support sleeve 5. The rotary piston rotary seal section 1001 divides the oil chamber 16 into a left oil chamber 1601 and a right oil chamber 1602. The left oil chamber 1601 is connected to the inner port of the third hydraulic oil circuit 9, and the right oil chamber 1602 is connected to the inner port of the fourth hydraulic oil circuit 8.

[0053] The outer circumferences of the left side support sleeve 4 and the right side support sleeve 5 of the main shaft are provided with multiple grooves, and the multiple grooves are respectively provided with dustproof sealing rings 12, oil sealing rings 13, and wear-resistant support pads 14 from the outside to the inside. The inner circumferences of the left side support sleeve 4 and the right side support sleeve 5 of the main shaft are provided with grooves, and the oil sealing rings 13 are provided in the grooves. The outer circumference of the rotary piston rotary sealing section 1001 is provided with multiple grooves, and the oil sealing rings 13 and wear-resistant support pads 14 are respectively provided in the grooves. The inner circumference of the rotary piston rotary sealing section 1001 is provided with multiple grooves, and the oil sealing rings 13 and wear-resistant support pads 14 are respectively provided in the grooves.

[0054] Among them, the wear-resistant support pad 14 is made of PTFE+copper powder, phenolic cloth, cypress, nylon and other materials with high wear resistance, high support force and high guiding stability. It can form effective support between the corresponding adjacent components, ensure the stability of the rotating components during rotation, reduce the rotation resistance, and at the same time avoid direct friction between adjacent components, which leads to the problem of increased noise of the swing cylinder.

[0055] By providing the oil sealing ring 13 , it is possible to prevent the hydraulic oil in the oil chamber 16 from leaking outward through the corresponding gap.

[0056] By providing a dustproof sealing ring 12 on the outermost side, dust and foreign matter in the external environment can be prevented from entering the cylinder and causing damage to related components.

[0057] However, the above description is merely a specific embodiment of the present invention and should not be used to limit the scope of implementation of the present invention. Therefore, the replacement of equivalent components, or equivalent changes and modifications made according to the scope of protection of the patent of the present invention should still fall within the scope covered by the claims of the present invention.

Claims

1. A hydraulic swing cylinder with a built-in hydraulic oil circuit, characterized by: It includes an outer shell and an oil balance valve, wherein the bottom end of the oil balance valve is fixedly connected to the outside of the outer shell; A third hydraulic oil circuit and a fourth hydraulic oil circuit are respectively provided inside the shell wall of the outer shell, one end of each of the third hydraulic oil circuit and the fourth hydraulic oil circuit extends to the outside of the outer shell at a position at the bottom end of the oil balance valve, the other end of the third hydraulic oil circuit extends to the axial left side of the inner circumference of the outer shell, and the other end of the fourth hydraulic oil circuit extends along the inside of the shell wall to the axial right side of the inner circumference of the outer shell; One end portion of the oil balance valve is provided with a first oil hole of the balance valve and a second oil hole of the balance valve respectively; The first oil hole and the second oil hole of the balancing valve are respectively provided with a first hydraulic oil circuit and a second hydraulic oil circuit on the inner sides thereof, and the first oil hole and the second oil hole of the balancing valve are respectively communicated with the first hydraulic oil circuit and the second hydraulic oil circuit, and the other ends of the first hydraulic oil circuit and the second hydraulic oil circuit respectively pass through the outside of the bottom end of the oil balancing valve, and are respectively communicated with the outer ports of the third hydraulic oil circuit and the fourth hydraulic oil circuit.

2. The hydraulic swing cylinder with a built-in hydraulic oil circuit according to claim 1, characterized in that: A sealing fixing plane is provided on the outside of the outer shell at the bottom end of the oil balancing valve, and the bottom end of the oil balancing valve is fixedly connected to the sealing fixing plane.

3. The hydraulic swing cylinder with a built-in hydraulic oil circuit according to claim 2, characterized in that: The bottom ends of the oil balancing valve are respectively located at the outer sides of the ports of the first hydraulic oil circuit and the second hydraulic oil circuit, and grooves are respectively provided. Oil sealing rings are provided in the grooves. The first hydraulic oil circuit and the second hydraulic oil circuit are respectively sealed and connected to the third hydraulic oil circuit and the fourth hydraulic oil circuit through oil sealing rings.

4. The hydraulic swing cylinder with a built-in hydraulic oil circuit according to claim 1, characterized in that: The fourth hydraulic oil circuit includes a rear-end transmission section of the fourth hydraulic oil circuit and a front-end boosting section of the fourth hydraulic oil circuit, and the aperture of the rear-end transmission section of the fourth hydraulic oil circuit is larger than the aperture of the front-end boosting section of the fourth hydraulic oil circuit; One end of the rear end transmission section of the fourth hydraulic oil circuit is connected to the second hydraulic oil circuit, the other end of the rear end transmission section of the fourth hydraulic oil circuit is connected to one end of the front end boosting section of the fourth hydraulic oil circuit, and the other end of the front end boosting section of the fourth hydraulic oil circuit is connected to the axial right side position of the inner circumference of the outer shell.

5. The hydraulic swing cylinder with a built-in hydraulic oil circuit according to claim 1, characterized in that: The other end portion of the oil balancing valve is provided with a third oil hole and a fourth oil hole of the balancing valve, respectively. The inner sides of the third oil hole and the fourth oil hole of the balancing valve are connected to the first hydraulic oil circuit and the second hydraulic oil circuit respectively.

6. The hydraulic swing cylinder with a built-in hydraulic oil circuit according to any one of claims 1 to 5, characterized in that: A main shaft is provided inside the outer shell, and the main shaft includes a left main shaft support section, a middle main shaft connection section, and a right main shaft support section, wherein the left main shaft support section and the right main shaft support section are respectively located at the outermost position of the inner circumference of the outer shell; A main shaft left support sleeve and a main shaft right support sleeve are respectively provided between the outer circumferences of the main shaft left support section and the main shaft right support section and the left and right inner circumferences of the outer shell. The outer circumferences of the main shaft left support sleeve and the main shaft right support sleeve are respectively rotatably sealed with the left and right inner circumferences of the outer shell, and the inner circumferences of the main shaft left support sleeve and the main shaft right support sleeve are respectively sealed and fixedly connected with the outer circumferences of the main shaft left support section and the main shaft right support section; An inner gear ring and a rotary piston are respectively provided between the middle connecting section of the main shaft and the middle position of the inner circumference of the outer shell from the outside to the inside. The rotary piston includes a rotary piston rotary sealing section and a rotary piston meshing rotary section. The rotary piston rotary sealing section is located on the left side of the rotary piston, and the rotary piston meshing rotary section is located on the right side of the rotary piston. The inner circumference of the rotary piston rotary seal section is rotary sealedly connected to the outer circumference of the main shaft intermediate connecting section, and the outer circumference of the rotary piston rotary seal section is rotary sealedly connected to the inner circumference of the outer shell; The outer circumference of the inner gear ring is fixedly connected to the inner circumference of the outer shell, the inner circumference of the inner gear ring is meshed and rotationally connected to the outer circumference of the meshing rotating section of the rotary piston, and the inner circumference of the meshing rotating section of the rotary piston is meshed and rotationally connected to the outer circumference of the middle connecting section of the main shaft.

7. The hydraulic swing cylinder with a built-in hydraulic oil circuit according to claim 6, characterized in that: An oil chamber is provided between the outer shell, the main shaft, the left support sleeve of the main shaft, and the right support sleeve of the main shaft. The rotary piston rotary seal section divides the oil chamber into a left oil chamber and a right oil chamber. The left oil chamber is connected to the inner port of the third hydraulic oil circuit, and the right oil chamber is connected to the inner port of the fourth hydraulic oil circuit.

8. The hydraulic swing cylinder with a built-in hydraulic oil circuit according to claim 7, characterized in that: The outer circumferences of the left and right spindle support sleeves are each provided with a plurality of grooves, and the plurality of grooves are respectively provided with a dustproof sealing ring, an oil sealing ring, and a wear-resistant support pad from the outside to the inside; The inner circumferences of the left side support sleeve and the right side support sleeve of the main shaft are both provided with grooves, and oil sealing rings are provided in the grooves; The outer circumference of the rotary sealing section of the rotary piston is provided with a plurality of grooves, and the grooves are respectively provided with oil sealing rings and wear-resistant support pads; The inner circumference of the rotary sealing section of the rotary piston is provided with a plurality of grooves, and an oil sealing ring and a wear-resistant support pad are respectively provided in the grooves.

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