Multi-piece hydraulic swivel joint and rotating equipment

Abstract

The invention discloses a multi-piece hydraulic swivel joint and rotating equipment, the multi-piece hydraulic swivel joint comprises a mandrel and a shell assembly, the shell assembly is arranged on the mandrel in a sleeving manner, the shell assembly comprises at least two single shells, the single shells can rotate relative to the mandrel, at least two oil ducts are arranged on the mandrel, and the single shells can rotate relative to the mandrel. The single shell is provided with at least two oil duct outlets, the oil ducts and the oil duct outlets are in one-to-one correspondence and are communicated with each other, and hydraulic oil can be input through the oil ducts on the mandrel and output through the channel oil grooves. According to the multi-piece type hydraulic swivel joint, the number of the single shells is the same as that of the oil ducts on the mandrel, and the two sides of each single shell are each provided with one partition disc, so that the stability of the single shells during oil duct adjustment is guaranteed, and the problem that when the number of the channels of the hydraulic swivel joint is large, the oil ducts cannot be adjusted is solved. The shell is complex in structure and high in manufacturing difficulty, the rotary sealing ring is difficult to mount and replace, and the sealing condition of each channel is difficult to detect.

Description

Technical Field

[0001] The invention belongs to the field of hydraulic components, and in particular relates to a multi-piece hydraulic swivel joint and a rotating device. Background Art

[0002] Hydraulic rotary joints are also called center rotary joints or central rotary joints. They are common in hydraulic systems and are mainly used to achieve fluid transportation between the fixed part and the rotary part of mechanical equipment so that the relative rotary parts do not interfere with each other. They are commonly used in rotary machinery such as engineering machinery and port machinery. The basic structure consists of a core shaft and a shell that is sleeved on the core shaft for rotational cooperation. The shell of the existing common hydraulic rotary joint is an integral part. When the number of oil channels is large, there will be the following disadvantages: first, the axial size of the shell becomes larger, the structure becomes more complicated, and the manufacturing difficulty increases; second, when assembling or repairing the hydraulic rotary joint, the installation and replacement of the rotating seal ring becomes more difficult; third, the sealing condition of a single channel of the integral shell is difficult to detect, especially when the pressure difference between adjacent oil channels is large, internal leakage is prone to occur, and the detection is more difficult. Summary of the invention

[0003] In order to solve the technical problems mentioned in the background technology that the axial size of the shell becomes larger, the structure becomes more complicated, the manufacturing difficulty increases, and the sealing condition of a single channel of the integral shell is difficult to detect, a multi-piece hydraulic swivel joint and a rotating device are provided to solve the above problems.

[0004] To achieve the above purpose, the specific technical solution of a multi-piece hydraulic swivel joint of the present invention is as follows: A multi-piece hydraulic rotary joint comprises a core shaft and a housing assembly, wherein the housing assembly is sleeved on the core shaft, the housing assembly comprises at least two single housings, and the single housings can rotate relative to the core shaft, at least two oil passages are arranged on the core shaft, at least two oil passage outlets are arranged on the single housings, the oil passages correspond to the oil passage outlets one by one and are interconnected, and hydraulic oil can be input through the oil passage on the core shaft and output from the passage oil groove.

[0005] Furthermore, the shell assembly also includes a spacer, and both sides of each single shell are clamped by at least one spacer.

[0006] Furthermore, the multi-piece hydraulic swivel joint also includes fasteners, which can relatively fix the spacer and the single shell.

[0007] Furthermore, through holes are provided on both the partition plate and the single shell, and a plurality of through holes can be aligned, and fasteners can pass through the aligned plurality of through holes to relatively fix the partition plate and the single shell.

[0008] Furthermore, the fastener includes a screw rod, which can pass through multiple aligned through holes. The fastener also includes a nut. Both ends of the screw rod are provided with threaded portions, and the nut can be threadedly connected with the threaded portions. The nuts at both ends of the screw rod can be screwed and approached to each other to clamp the partition plate and the single shell mounted on the screw rod.

[0009] Furthermore, the multi-piece hydraulic rotary joint also includes a bearing, which is sleeved on the outer wall of the core shaft and abuts against the housing assembly.

[0010] Furthermore, the multi-piece hydraulic rotary joint also includes a gland, which is disposed on the end of the core shaft and abuts against the outer ring of the bearing.

[0011] Furthermore, a dust ring is arranged on the outer side of the bearing.

[0012] Furthermore, a rotating sealing ring is provided at one end of the single shell close to the core shaft.

[0013] A rotating device uses the above-mentioned multi-piece hydraulic rotary joint.

[0014] The multi-piece hydraulic rotary joint of the present invention has the following advantages: the multi-piece hydraulic rotary joint ensures the stability of the single shell when adjusting the oil channel by making the number of single shells consistent with the number of oil channels on the core shaft, and each single shell is provided with a spacer on both sides, thereby solving the problems of the hydraulic rotary joint having a complex shell structure and great difficulty in manufacturing when the number of channels is large, the difficulty in installing and replacing the rotating sealing ring, and the difficulty in detecting the sealing conditions of each channel. In addition, the multi-piece hydraulic rotary joint has great advantages in manufacturing, installation, inspection, and maintenance, and has the advantages of a wide range of practical applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the multi-piece hydraulic rotary joint of the present invention; Figure 2 It is a cross-sectional view of the multi-piece hydraulic swivel joint of the present invention.

[0016] Description of the markings in the figure: 1. Mandrel; 11. Oil channel; 12. First installation position; 2. Housing assembly; 21. Single housing; 211. Channel oil groove; 212. Oil channel outlet; 22. Spacer; 23. Rotary sealing ring; 24. Bearing outer ring pressure cover; 241. Second installation position; 25. Bearing inner ring pressure cover; 26. Bolts; 27. Dust ring; 28. Fasteners; 29. ​​Bearing. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0018] Those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0019] In the prior art, hydraulic rotary joints are also called center rotary joints or central rotary joints. They are common in hydraulic systems and are mainly used to realize fluid transportation between the fixed part and the rotary part of mechanical equipment so that the relative rotary parts do not interfere with each other. They are commonly used in rotary machinery such as engineering machinery and port machinery. The basic structure consists of a core shaft 1 and a shell that is sleeved on the core shaft 1 for rotational cooperation. The shell of the existing common hydraulic rotary joint is an integral part. When the number of oil passages 11 is large, there will be the following disadvantages: first, the axial size of the shell becomes larger, the structure becomes more complicated, and the manufacturing difficulty increases; second, when the hydraulic rotary joint is assembled or repaired, the installation and replacement of the rotating seal ring 23 becomes more difficult; third, it is difficult to detect the sealing condition of a single channel of the integral shell, especially when the pressure difference between adjacent oil passages 11 is large, it is easy to have internal leakage, and the detection difficulty is even greater.

[0020] Please refer to the attached Figure 1 To Attachment Figure 2 The invention describes a multi-piece hydraulic rotary joint and a rotary device.

[0021] This embodiment provides a multi-piece hydraulic rotary joint, such as Figure 1 and Figure 2 As shown, the multi-piece hydraulic rotary joint includes a core shaft 1 and a housing assembly 2, the housing assembly 2 is sleeved on the core shaft 1, the housing assembly 2 includes at least two single housings 21, and the single housings 21 can rotate relative to the core shaft 1, at least two oil passages 11 are provided on the core shaft 1, at least two oil passage outlets 212 are provided on the single housing 21, the oil passages 11 correspond to the oil passage outlets 212 one by one and are connected to each other, and the hydraulic oil can be input through the oil passage 11 on the core shaft 1 and output from the channel oil groove 211.

[0022] The multi-piece hydraulic rotary joint ensures the stability of the single shell 21 when the oil passage 11 is adjusted by making the number of the single shells 21 consistent with the number of the oil passages 11 on the core shaft 1, and providing a spacer 22 on both sides of each single shell 21. This solves the problems of the hydraulic rotary joint having a complex shell structure and difficult manufacturing when the number of passages is large, the difficulty in installing and replacing the rotating sealing ring 23, and the difficulty in detecting the sealing conditions of each passage. In addition, the multi-piece hydraulic rotary joint has great advantages in manufacturing, installation, inspection, and maintenance, and has the advantages of a wide range of practical applications.

[0023] Optionally, the core shaft 1 is a stepped shaft, and six oil passages 11 are arranged along the axial direction. The outlet of each oil passage 11 is connected to the channel oil groove 211 on the single shell 21 at the corresponding position, and an oil passage outlet 212 is arranged on each single shell 21. In this way, the oil in each oil passage 11 is input from the core shaft 1 to the output of the rotatable shell, and the pressure and specifications of each oil passage 11 can be set according to actual needs.

[0024] In order to correspond to the six oil passages 11 on the core shaft 1, the housing assembly 2 is a multi-piece composite structure, on which six single housings 21 are provided. A rotary seal ring 23 is provided on each channel oil groove 211 of each single housing 21 and on both ends cooperating with the core shaft 1. A spacer 22 is provided on both sides of each single housing 21. The spacer 22 includes five middle spacers 22 and one head and one tail spacer 22 each provided with a bearing 29 installation position, for a total of seven. Furthermore, the shell assembly 2 also includes a spacer 22 , and both sides of each single shell 21 are clamped by at least one spacer 22 .

[0025] Furthermore, the multi-piece hydraulic swivel joint also includes a fastener 28 , which can relatively fix the spacer 22 and the single shell 21 .

[0026] Furthermore, both the partition plate 22 and the single shell 21 are provided with through holes, and a plurality of through holes can be aligned, and the fasteners 28 can pass through the aligned plurality of through holes to relatively fix the partition plate 22 and the single shell 21.

[0027] Furthermore, the fastener 28 includes a screw rod, which can pass through multiple aligned through holes. The fastener 28 also includes a nut. Both ends of the screw rod are provided with threaded portions, and the nut can be threadedly connected with the threaded portions. The nuts at both ends of the screw rod can be screwed and approached to each other to clamp the partition plate 22 and the single shell 21 mounted on the screw rod.

[0028] Furthermore, the multi-piece hydraulic rotary joint further includes a bearing 29 , which is sleeved on the outer wall of the core shaft 1 and abuts against the housing assembly 2 .

[0029] Furthermore, the multi-piece hydraulic rotary joint also includes a gland, which is disposed on the end of the core shaft 1 and abuts against the outer ring of the bearing 29 .

[0030] It should be noted that installation positioning steps are provided between each of the bearing outer ring cover 24, the spacer 22 and the single shell 21 to facilitate installation. Therefore, it has the advantages of simple and reliable structure and low manufacturing, installation, inspection and maintenance costs.

[0031] Furthermore, a dust ring 27 is provided on the outer side of the bearing 29 .

[0032] Optionally, the inner ring limit of the above-mentioned bearing 29 can be achieved through the shoulder of the core shaft 1, and the inner ring limit of the tail end bearing 29 is achieved by installing a plurality of bolts 26 on the bearing inner ring pressure cover 25 at the end of the core shaft 1.

[0033] Furthermore, a rotating sealing ring 23 is provided at one end of the single shell 21 close to the core shaft 1 .

[0034] This embodiment also provides a rotating device, using the above-mentioned multi-piece hydraulic swivel joint, and a first installation position 12 for connecting to the rotating device is provided at the end of the core shaft 1 away from the shell assembly 2, and a second installation position 241 for connecting to the rotating device is provided on the outer wall of the shell assembly 2, thereby facilitating the connection of the multi-piece swivel joint with the outside world.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention, such as the installation position of the present device and the target rotating device (including the first installation position 12 and the second installation position 241 mentioned above) and the layout and position of the channel oil groove 211, the increase or decrease of the head and tail bearings 29 and the dust rings 27 on their outer sides, the connection method of the fasteners 28, etc., should all be included in the protection scope of the present invention.

[0036] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A multi-piece hydraulic rotary joint, characterized in that: It includes a core shaft and a housing assembly, the housing assembly is sleeved on the core shaft, the housing assembly includes at least two single housings, and the single housings can rotate relative to the core shaft, at least two oil channels are arranged on the core shaft, at least two oil channel outlets are arranged on the single housings, the oil channels and the oil channel outlets correspond to each other one by one and are interconnected, and the hydraulic oil can be input through the oil channel on the core shaft and output from the channel oil groove.

2. The multi-piece hydraulic rotary joint according to claim 1, characterized in that: The shell assembly also includes a spacer, and both sides of each single shell are clamped by at least one spacer.

3. The multi-piece hydraulic rotary joint according to claim 2, characterized in that: The multi-piece hydraulic swivel joint also includes fasteners, which can relatively fix the spacer and the single shell.

4. The multi-piece hydraulic rotary joint according to claim 3, characterized in that: Through holes are provided on both the partition plate and the single shell, and a plurality of through holes can be aligned, and fasteners can pass through the aligned plurality of through holes to relatively fix the partition plate and the single shell.

5. The multi-piece hydraulic rotary joint according to claim 4, characterized in that: The fastener includes a screw rod, which can pass through multiple aligned through holes. The fastener also includes a nut. Both ends of the screw rod are provided with threaded portions, and the nut can be threadedly connected with the threaded portions. The nuts at both ends of the screw rod can be screwed and approached to each other to clamp the partition plate and the single shell mounted on the screw rod.

6. The multi-piece hydraulic swivel joint according to claim 1, characterized in that: The multi-piece hydraulic rotary joint also includes a bearing, which is sleeved on the outer wall of the core shaft and abuts against the housing assembly.

7. The multi-piece hydraulic rotary joint according to claim 6, characterized in that: The multi-piece hydraulic rotary joint also includes a gland, which is arranged on the end of the core shaft and abuts against the outer ring of the bearing.

8. The multi-piece hydraulic rotary joint according to claim 6, characterized in that: A dust ring is provided on the outside of the bearing.

9. The multi-piece hydraulic rotary joint according to any one of claims 1 to 8, characterized in that: A rotating sealing ring is arranged at one end of the single shell body close to the core shaft.

10. A rotating device, characterized in that: A multi-piece hydraulic swivel joint as described in any one of claims 1 to 9 is used.

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