Central swivel joint for electro-hydraulic hybrid drive type excavator

Abstract

The utility model discloses a central swivel joint for an electro-hydraulic hybrid drive type excavator, which comprises a swivel shaft, a swivel body, an isolation sleeve and an end cover, the swivel shaft comprises a shaft body and a connecting flange fixedly connected to one end of the shaft body, the center of the shaft body is provided with a central oil duct along the axial direction, and the periphery of the central oil duct is provided with a plurality of oil inlet ducts along the axial direction; the rotary body is connected to the outer side of the rotary shaft in a sleeving mode, a plurality of annular grooves and a plurality of oil outlet channels are formed in the inner side wall of the rotary body, the oil outlet channels are located between the annular grooves and correspondingly communicate with the oil inlet channels, and the ends, away from the oil inlet channels, of the oil outlet channels are connected with oil outlet pipes; the isolation sleeve sleeves the inner side of the rotating shaft, the end cover is located at the end, away from the connecting flange, of the rotating shaft, and the rotating body and the isolation sleeve are detachably connected with the end cover.

Description

Technical Field

[0001] The utility model relates to the technical field of central rotary joints, in particular to a central rotary joint for an electric and hydraulic hybrid driven excavator. Background Art

[0002] The central swivel joint is a key component in the hydraulic system of mechanical equipment such as excavators, cranes, graders, tower cranes, and rotary drilling rigs. Its function is to connect the hydraulic pipelines of the fixed and rotating parts of the entire system, so that the upper and lower parts or the front and back parts of the system hydraulic pipeline can rotate 360 ​​degrees relative to each other without interference.

[0003] Traditional excavators rely on hydraulic drive as the driving force. With the promotion and application of new energy in the domestic market, excavator drives are gradually moving towards electric and hydraulic hybrid drives. The electric drive part requires a large number of cables, some of which need to pass through the center of the central rotary joint. Therefore, how to effectively separate this part of the cable from the original hydraulic system has become a key issue.

[0004] In view of this, there is an urgent need for a central swivel joint for an electric and hydraulic hybrid drive excavator that can solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide a central rotary joint for an electric and hydraulic hybrid driven excavator which solves the above problems.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solution: a central rotary joint for an electric and hydraulic hybrid drive excavator, comprising:

[0007] A rotary shaft, a rotary body, an isolation sleeve and an end cover. The rotary shaft includes a shaft body and a connecting flange fixedly connected to one end of the shaft body. A central oil channel is axially opened at the center of the shaft body, and multiple oil inlet channels are axially arranged around the central oil channel.

[0008] The rotating body is sleeved on the outside of the rotating shaft, and a plurality of annular grooves and a plurality of oil outlet channels are provided on the inner wall of the rotating body. The plurality of oil outlet channels are respectively located between the plurality of annular grooves, and the plurality of oil outlet channels are respectively connected to the plurality of oil inlet channels, and the plurality of oil outlet channels are connected to the oil outlet pipe at one end away from the oil inlet channel.

[0009] The isolation sleeve is sleeved on the inner side of the rotary shaft, the end cover is located at one end of the rotary shaft away from the connecting flange, and the rotary body and the isolation sleeve are respectively detachably connected to the end cover.

[0010] Preferably, O-rings matching the annular grooves at both ends of the inner wall of the rotating body are provided, and an oil seal is provided in the annular groove located in the middle part of the rotating body.

[0011] Preferably, the outer wall of the rotary shaft is in the shape of a T-shaped cylinder, and the outer diameter of the end of the rotary shaft close to the connecting flange is larger than the outer diameter of the end of the rotary shaft away from the connecting flange.

[0012] Preferably, at least one set of annular gap grooves and gap rings are respectively provided on the inner wall of one end of the shaft body close to the connecting flange and the inner wall of the connecting flange, and the gap rings are placed in the annular gap grooves.

[0013] Preferably, the isolation sleeve includes a cylinder and an embedded flange, a plurality of screw holes and screws matching the screw holes are provided on the plane side wall of the cylinder, and both ends of the cylinder are connected to the embedded flange and the end cover through the plurality of screws.

[0014] Preferably, the isolation cylinder includes a cylinder body and an embedded flange, one end of the cylinder body is detachably connected to the embedded flange, and the outer wall of the other end is provided with an annular boss, and the outer wall of the annular boss is provided with multiple arc-shaped grooves, and the side wall of the end cover close to the cylinder side is provided with an annular plate matching the annular boss, and the annular plate is provided with an arc-shaped through hole matching the arc-shaped groove, and the arc-shaped through hole is provided with an arc block matching it.

[0015] Preferably, an inclined groove is provided in the middle of the arc block, and perforations corresponding to the position of the inclined groove are provided on the annular plate and the end cover, and the arc block is provided with a strip-shaped auxiliary probe rod matching the inclined groove, and the strip-shaped auxiliary probe rod is inclined near one end of the arc block.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] In the utility model, an isolation sleeve for isolating the shaft and the center oil channel is provided at the position of the original center oil channel in the traditional central rotary joint, providing a placement cavity for the placement of the cable. At the same time, considering the subsequent replacement or removal of the isolation sleeve, a more convenient way is provided to complete the installation of the isolation sleeve and the end cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall cross-sectional structure of a central rotary joint for an electric and hydraulic hybrid drive excavator;

[0019] Figure 2 for Figure 1 Schematic diagram of the enlarged structure at A in the middle;

[0020] Figure 3 for Figure 1 Schematic diagram of the enlarged structure at B in the middle;

[0021] Figure 4 This is a schematic diagram of the cross-sectional dispersion structure of the isolation sleeve and the end cover in the second embodiment of the present utility model.

[0022] In the figure: 1. Rotating shaft; 10. Center oil channel; 100. Oil inlet channel; 11. Connecting flange; 110. Annular gap groove; 111. Gap ring; 12. Shaft body; 2. Rotating body; 20. Annular groove; 201. O-ring; 202. Oil seal; 21. Oil outlet channel; 210. Oil outlet pipe; 3. Isolation sleeve; 30. Cylinder body; 300. Screw hole; 301. Screw; 31. Fitting flange; 32. Annular boss; 320. Arc groove; 321. Annular plate; 3210. Perforation; 322. Arc block; 3220. Inclined groove; 3221. Auxiliary probe rod; 4. End cover. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Example 1

[0024] Please see the attached Figure 1-3 , a central rotary joint for an electric and hydraulic hybrid drive excavator, comprising:

[0025] Rotating shaft 1, rotating body 2, isolation sleeve 3 and end cover 4. The rotating shaft 1 includes a shaft body 12 and a connecting flange 11 fixedly connected to one end of the shaft body 12. A central oil passage 10 is axially opened at the center of the shaft body 12. A plurality of oil inlet passages 100 are axially arranged around the periphery of the central oil passage 10.

[0026] The rotating body 2 is sleeved on the outside of the rotating shaft 1. The inner wall of the rotating body 2 is provided with a plurality of annular grooves 20 and a plurality of oil outlet passages 21. The plurality of oil outlet passages 21 are respectively located between the plurality of annular grooves 20. The plurality of oil outlet passages 21 are respectively connected to the plurality of oil inlet passages 100. The ends of the plurality of oil outlet passages 21 away from the oil inlet passages 100 are connected to the oil outlet pipes 210.

[0027] The isolation sleeve 3 is sleeved on the inner side of the rotary shaft 1, the end cover 4 is located at the end of the rotary shaft 1 away from the connecting flange 11, and the rotary body 2 and the isolation sleeve 3 are detachably connected to the end cover 4 respectively;

[0028] Considering that if the existing central rotary joint is modified too much, the type of excavators that can be adapted to this type of central rotary joint will be limited, a sleeved isolation sleeve 3 is provided in the center oil channel 10 on the basis of the traditional central rotary joint connected by the rotary shaft 1, the rotary body 2 and the end cover 4. The isolation sleeve 3 isolates the cable cavity for placing the cable at the center oil channel 10 position of the shaft body 10 through the isolation sleeve 3. The structure is almost the same as the original central rotary joint in appearance. While not affecting the adaptability of the central rotary joint to the excavator, it also solves the problem of cable placement in electric drive applications.

[0029] Specifically, O-rings 201 matching therewith are provided in the annular grooves 20 at both ends of the inner wall of the rotating body 2, and an oil seal 202 is provided in the annular groove 20 located in the middle part of the rotating body 2;

[0030] A plurality of annular grooves 200 are provided on the inner wall of the rotating body 2, and O-rings 201 and oil seals 202 are filled in corresponding positions. The O-rings 201 can also be equipped with appropriate retaining ring structures to ensure that the O-rings 201 do not leak oil under high pressure.

[0031] Specifically, the outer wall of the rotating shaft 1 is in the shape of a T-cylinder, and the outer diameter of the end of the rotating shaft 1 close to the connecting flange 11 is larger than the outer diameter of the end of the rotating shaft 1 away from the connecting flange 11; considering that if the rotating shaft 1 adopts a cylindrical structure, the rotating body 2 may slide axially when the rotating shaft 1 and the rotating body 2 rotate relative to each other, the outer wall of the rotating shaft 1 adopts a T-cylindrical shape to avoid the rotating body 2 from sliding axially.

[0032] Specifically, at least one set of annular gap grooves 110 and gap rings 111 are respectively provided on the inner wall of one end of the shaft body 12 close to the connecting flange 11 and the inner wall of the connecting flange 11 , and the gap rings 111 are placed in the annular gap grooves 110 .

[0033] Specifically, the isolation sleeve 3 includes a barrel 30 and an embedded flange 31. The flat side wall of the barrel 30 is provided with a plurality of screw holes 300 and screws 301 matching the screw holes 300. The two ends of the barrel 30 are connected to the embedded flange 31 and the end cover 4 respectively through a plurality of screws 301.

[0034] The two ends of the cylinder 30 are respectively connected to the embedded flange 31 and the end cover 4 through the screw 301 and the corresponding screw hole 300, that is, in application, the isolation sleeve 3, the end cover 4 and the rotating body 4 are relatively stationary, and the isolation sleeve 3, the end cover 4 and the rotating body 4 are relatively rotated with the rotating shaft 1, that is, the embedded flange 31 and the connecting flange 11 are relatively rotated. In order to avoid the friction generated by the contact between the two during the relative rotation process, which may cause wear of the embedded flange 31 or the connecting flange 11, at least one set of annular gap grooves 11 and a gap ring 111 matching the annular gap grooves 11 are provided on the inner wall of the connecting flange 11, which play a role similar to that of a bearing and reduce the friction between the connecting flange 11 and the embedded flange 31.

[0035] Please see the attached Figure 4 Example 2

[0036] Considering that the use of screw 301 and screw hole 300 to connect the cylinder 30 and the end cover 4 may have the following problems, the wall thickness of the cylinder 30 is relatively thin compared to the rotating body 2 or the rotating shaft 1, and four screw holes 300 are provided on the side wall of the through-groove cylinder 30 close to the end cover 4, and even some cylinders 30 are provided with eight screw holes 300. Therefore, the side of the cylinder 30 close to the end cover 4 is prone to deformation during transportation and storage before installation. Secondly, the working environment of the excavator is usually poor, and the screw 301 is prone to rust or dust contamination, making it difficult to disassemble. Therefore, the connection method of the end cover 4 and the cylinder 30 is improved to simplify the connection between the end cover 4 and the cylinder 30.

[0037] Specifically, the isolation cylinder 3 includes a cylinder 30 and an embedded flange 31. One end of the cylinder 30 is detachably connected to the embedded flange 31, and the outer wall of the other end is provided with an annular boss 32. The outer wall of the annular boss 32 is provided with a plurality of arc-shaped grooves 320. The side wall of the end cover 4 close to the cylinder 30 is provided with an annular plate 321 matching the annular boss 32. The annular plate 321 is provided with an arc-shaped through-hole 321 matching the arc-shaped groove 320, and the arc-shaped through-hole 321 is provided with an arc-shaped block 322 matching it.

[0038] The cylinder 30 is close to the end of the end cover 4 and adopts the structure of an annular boss 32. The end cover 4 is provided with an annular plate 321 that cooperates with the annular boss 32. By providing an arc groove 320 on the annular boss 32, providing an arc through-hole 321 with a relatively large position on the annular plate 321, and using an arc block 322 as a wedge, the connection between the cylinder 30 and the end cover 4 is achieved. It should be noted that the height of the arc block 322 should be greater than the arc groove 320 and less than the thickness of the annular plate 321. When the end cover 4 and the cylinder 30 are connected, the arc block 322 is completely located In the arc-shaped through-hole 321 of the annular plate 321, as the end cover 4 is inserted, when the arc-shaped through-hole 321 on the annular plate 321 coincides with the arc-shaped groove 320 on the annular boss 32, a portion of the arc block 322 falls into the arc-shaped groove 320, completing the connection between the end cover and the cylinder 30. The number of arc-shaped grooves 320 provided is not less than two, which can ensure that the end cover 4 and the cylinder 30 will not fall off without the aid of external force or tools. In this way, the edge of the cylinder 30 close to the end cover 4 is intact and not easy to be damaged, and there is no problem of rust on spare parts.

[0039] Considering that the above structure is relatively easy to install, but when it needs to be disassembled, unless the cylinder 30 is destructively removed, it is difficult to completely separate the end cover 4 and the cylinder 30. In view of this, preparations for disassembling the end cover 4 and the cylinder 30 are required.

[0040] Specifically, an inclined groove 3220 is provided in the middle of the arc block 322, and a perforation 3210 corresponding to the position of the inclined groove 3220 is provided on the annular plate 321 and the end cover 4, and the arc block 322 is provided with a strip-shaped auxiliary probe 3221 matching the inclined groove 3220, and the strip-shaped auxiliary probe 3221 is inclined at one end close to the arc block 322;

[0041] As attached Figure 4 As shown, an inclined groove 3220 is provided in the middle position of the arc block 322, and a through-hole 3210 for removing the end cover 4 and the cylinder 30 is pre-set at the corresponding positions of the end cover 4 and the annular plate 321. When the strip auxiliary probe rod 3221 matching the inclined groove 3220 is inserted into the through-hole 3210, the arc block 322 can only be located in the arc through-hole 321 provided on the annular plate 321. Even if the position of the arc through-hole 321 coincides with the position of the arc groove 320, the arc block 322 cannot fall into the arc groove 320. When the cylinder 30 needs to be removed, during the process of inserting the strip auxiliary probe rod 3221 into the through-hole 3210 and the inclined groove 3220, the arc block 322 will passively move in the direction away from the cylinder 30 until it is completely separated from the arc groove 320 and returns to the arc through-hole 321, contacting the connection between the end cover 4 and the cylinder 30.

[0042] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A central rotary joint for an electric and hydraulic hybrid drive excavator, characterized in that: include: A rotary shaft (1), a rotary body (2), an isolation sleeve (3) and an end cover (4), wherein the rotary shaft (1) comprises a shaft body (12) and a connecting flange (11) fixedly connected to one end of the shaft body (12), a central oil passage (10) is axially provided at the center of the shaft body (12), and a plurality of oil inlet passages (100) are axially provided around the periphery of the central oil passage (10); The rotating body (2) is sleeved on the outside of the rotating shaft (1), and a plurality of annular grooves (20) and a plurality of oil outlet passages (21) are provided on the inner side wall of the rotating body (2), and the plurality of oil outlet passages (21) are respectively located between the plurality of annular grooves (20), and the plurality of oil outlet passages (21) are respectively connected to the plurality of oil inlet passages (100), and the ends of the plurality of oil outlet passages (21) away from the oil inlet passages (100) are connected to the oil outlet pipes (210). The isolation sleeve (3) is sleeved on the inner side of the rotary shaft (1), the end cover (4) is located at the end of the rotary shaft (1) away from the connecting flange (11), and the rotary body (2) and the isolation sleeve (3) are respectively detachably connected to the end cover (4).

2. The central rotary joint for an electric and hydraulic hybrid drive excavator according to claim 1, characterized in that: Matching O-rings (201) are provided in the annular grooves (20) at both ends of the inner wall of the rotating body (2), and an oil seal (202) is provided in the annular groove (20) located in the middle part of the rotating body (2).

3. The central rotary joint for an electric-hydraulic hybrid drive excavator according to claim 1, characterized in that: The outer wall of the rotary shaft (1) is in the shape of a T-shaped cylinder, and the outer diameter of the end of the rotary shaft (1) close to the connecting flange (11) is larger than the outer diameter of the end of the rotary shaft (1) away from the connecting flange (11).

4. The central rotary joint for an electric-hydraulic hybrid drive excavator according to claim 3, characterized in that: At least one set of annular gap grooves (110) and gap rings (111) are provided on the inner wall of one end of the shaft body (12) close to the connecting flange (11) and the inner wall of the connecting flange (11), and the gap rings (111) are placed in the annular gap grooves (110).

5. The central rotary joint for an electric-hydraulic hybrid drive excavator according to claim 3, characterized in that: The isolation sleeve (3) comprises a barrel (30) and an embedded flange (31), a plurality of screw holes (300) and screw rods (301) matching the screw holes (300) are provided on the plane side wall of the barrel (30), and both ends of the barrel (30) are connected to the embedded flange (31) and the end cover (4) respectively through the plurality of screw rods (301).

6. The central rotary joint for an electric-hydraulic hybrid drive excavator according to claim 1, characterized in that: The isolation sleeve (3) comprises a cylinder (30) and an embedded flange (31), one end of the cylinder (30) is detachably connected to the embedded flange (31), and the outer wall of the other end is provided with an annular boss (32), and the outer wall of the annular boss (32) is provided with a plurality of arc-shaped grooves (320), and the side wall of the end cover (4) close to the cylinder (30) is provided with an annular plate (321) matching the annular boss (32), and the annular plate (321) is provided with an arc-shaped penetration hole (3210) matching the arc-shaped groove (320), and the arc-shaped penetration hole (3210) is provided with an arc-shaped block (322) matching it.

7. The central rotary joint for an electric-hydraulic hybrid drive excavator according to claim 6, characterized in that: An inclined groove (3220) is provided in the middle of the arc block (322); an arc-shaped through hole (3210) corresponding to the position of the inclined groove (3220) is provided on the annular plate (321) and the end cover (4); and a strip-shaped auxiliary probe rod (3221) matching the inclined groove (3220) is provided on the arc block (322); and the strip-shaped auxiliary probe rod (3221) is inclined at one end close to the arc block (322).

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