Central swivel joint provided with wear pieces

Abstract

The utility model discloses a central swivel joint with wear pieces, which comprises a swivel shaft which is a stepped cylinder, the center of the swivel shaft is provided with a central oil duct along the axial direction, the periphery of the central oil duct is provided with an oil inlet duct along the axial direction, and the step of the swivel shaft is provided with a wear component; 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 among the annular grooves respectively and correspondingly communicate with the oil inlet channels respectively, and the ends, away from the oil inlet channels, of the oil outlet channels are connected with oil outlet pipes; the end, away from the rotating shaft, of the rotating body is provided with an end cover matched with the rotating body. The end, close to the step of the rotating shaft, of the rotating body is provided with a connecting flange detachably connected with the rotating body. The abrasion assembly is mainly formed by embedding a plurality of arc-shaped abrasion pieces, only the abrasion pieces need to be replaced under the condition of serious abrasion, and meanwhile, in order to reduce the replacement difficulty, the multiple abrasion pieces are adopted to be spliced into a complete annular abrasion piece.

Description

Technical Field

[0001] The utility model relates to the technical field of central rotary joints, in particular to a central rotary joint provided with a wear plate. 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] In the prior art, after long-term operation, the contact surface between the rotating shaft and the rotating body will show obvious wear due to the long-term relative rotation. This wear will cause the gap between the rotating shaft and the rotating body to increase. To address the above problem, Patent 202323406954.6 designs a central rotating joint with adjustable gap. The gap is adjusted by adjusting the position of the turntable. However, its solution has the following problems: first, the turntable as a whole may not be smooth during the wear process, and the wear surface may have a certain curvature. Therefore, even if the position of the turntable is changed by adjusting the gap, the problem of uneven wear surface still exists. Second, the turntable is connected to the core shaft (i.e., the rotating shaft) with a thread. However, during the relative rotation of the rotating shaft and the rotating body, the turntable may be subjected to a large force, causing the thread on the core shaft (i.e., the rotating body) to be damaged or even worn flat. In this case, it is likely that the turntable will be tilted to a certain extent, exacerbating the wear of the contact surface;

[0004] The fundamental reason for setting up the intermittent adjustment structure in Patent 202323406954.6 is that when the original rotating shaft and rotating body are worn, it is not only difficult to maintain, but also the maintenance cost is high. The present invention believes that effectively reducing the maintenance difficulty and maintenance cost is the only way to solve this problem once and for all.

[0005] In view of this, there is an urgent need for a central swivel joint with a wear plate that can solve the above problems. Utility Model Content

[0006] The purpose of the utility model is to provide a central swivel joint provided with a wear plate to solve the above problem.

[0007] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solution: a central rotary joint provided with a wear plate, comprising:

[0008] The rotary shaft is a stepped cylinder, a central oil channel is opened in the center of the rotary shaft along the axial direction, an oil inlet channel is arranged in the outer periphery of the central oil channel along the axial direction, and a wear component is arranged at the step of the rotary shaft;

[0009] The rotating body is sleeved on the outer side of the rotating shaft, and a plurality of annular grooves and a plurality of oil outlet channels are provided on the inner side 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 an oil outlet pipe at one end away from the oil inlet channel;

[0010] An end cover matching the rotating body is provided at one end of the rotating body away from the rotating shaft, and a connecting flange detachably connected to the rotating body is provided at one end of the rotating body close to the rotating shaft step.

[0011] 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.

[0012] Preferably, at least one detection hole is provided on the curved side wall of one end of the rotary shaft away from the rotary body, and the detection hole is communicated with the oil inlet passage.

[0013] Preferably, the wear assembly includes at least two groups of wear plates, multiple connecting ears and multiple connecting bolts. The wear plate is arc-shaped, and its two ends are respectively provided with an interlocking arc-shaped step integrally formed with it, and the interlocking arc-shaped steps located on both sides of the wear plate match each other. The connecting ear is fixedly connected to the side wall of the interlocking arc-shaped step away from the center of the wear plate, and the connecting ear is provided with a connecting hole matching the connecting bolt.

[0014] Preferably, a connecting ear corresponding to the position of the wear plate is fixedly connected to the curved side wall at the step of the rotating shaft, and positioning grooves corresponding to the number of the wear plates are evenly provided on the flat side wall at the step of the rotating shaft.

[0015] Preferably, a mounting groove matching the wear plate is provided on the side wall of the connecting flange close to the wear plate, and a secondary wear plate matching the wear plate is provided in the mounting groove.

[0016] Preferably, a positioning protrusion matching the positioning groove is provided on the side of the wear plate that contacts the plane side wall of the rotary shaft.

[0017] Preferably, an inner countersunk hole is provided on the bottom wall of the positioning groove, and an inner countersunk bolt is placed in the inner countersunk hole. A lateral hole that passes through the lower end of the inner countersunk hole is provided on the side wall of the curved surface of the rotating shaft. The lower end of the inner countersunk bolt is located in the lateral hole and does not contact the bottom wall of the lateral hole.

[0018] Preferably, the lateral hole is provided with a wedge matching it, the length of the wedge is greater than the length of the lateral hole, and the wedge is located at one end of the lateral hole and is inclined.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] A wear plate that is detachably connected to the rotating shaft is set at the contact position between the rotating shaft and the rotating body. When severe wear occurs, only the wear plate needs to be replaced. At the same time, in order to reduce the difficulty of replacement, multiple wear plates are assembled into a complete annular wear plate. At the same time, considering that the central rotary joint is gradually becoming intelligent, multiple detection holes for installing detectors are set on the side wall of the rotating shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall cross-sectional structure of a central rotary joint provided with a wear plate;

[0022] Figure 2 for Figure 1 Schematic diagram of the enlarged structure at A in the middle;

[0023] Figure 3 This is a schematic diagram of the dispersed structure of the wear plate and the rotary shaft in the utility model;

[0024] Figure 4 This is a bottom view of the structure of the wear plate in the embodiment of the utility model;

[0025] Figure 5 This is a schematic diagram of the cross-sectional dispersion structure of the contact between the rotary shaft and the connecting flange in an embodiment of the present utility model;

[0026] Figure 6 for Figure 5 Schematic diagram of the enlarged structure at point B in the middle.

[0027] In the figure: 1. Rotating shaft; 10. Center oil channel; 100. Oil inlet channel; 11. Positioning groove; 110. Countersunk hole; 111. Countersunk bolt; 12. Lateral hole; 120. Wedge; 13. Inspection hole; 2. Rotating body; 20. Annular groove; 201. O-ring; 202. Oil seal; 21. Oil outlet channel; 210. Oil outlet pipe; 3. End cover; 4. Connecting flange; 40. Mounting groove; 5. Wear assembly; 50. Wear plate; 500. Engaging arc step; 50a. Auxiliary wear plate; 501. Positioning protrusion; 51. Connecting ear; 510. Connecting hole; 52. Connecting bolt;. DETAILED DESCRIPTION

[0028] 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.

[0029] Please see the attached Figure 1-2 , a central swivel joint provided with a wear plate, comprising:

[0030] The rotary shaft 1 is a stepped cylinder. A central oil passage 10 is axially provided at the center of the rotary shaft 1. An oil inlet passage 100 is axially provided at the periphery of the central oil passage 10. A wear assembly 5 is provided at the step of the rotary shaft 1.

[0031] The rotating body 2 is sleeved on the outer side of the rotating shaft 1. The inner side 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 oil outlet pipes 210.

[0032] The end of the rotating body 2 away from the rotating shaft 1 is provided with an end cover 3 matched therewith, and the end of the rotating body 2 close to the step of the rotating shaft 1 is provided with a connecting flange 4 detachably connected to the rotating body 2;

[0033] At least one detection hole 13 is provided on a curved side wall of one end of the rotary shaft 1 away from the rotary body 2 , and the detection hole 13 is communicated with the oil inlet passage 100 .

[0034] The rotating shaft 1 is a stepped cylinder, the end with a larger outer diameter of which is connected to the equipment, and the end with a smaller outer diameter is located in the rotating body 2 and rotates relative to it. At the same time, considering that machinery is becoming increasingly intelligent, more and more data need to be detected, such as the need to detect oil pressure, oil temperature and other data. Therefore, multiple detection holes 13 are opened on the rotating shaft 1, and then multiple detectors are installed to achieve the purpose of simultaneous detection of multiple data.

[0035] Considering the sealing performance of the central rotary joint, the O-ring 201 and the oil seal 202 are used for segmented sealing. Figure 1 As shown,

[0036] Specifically, O-rings 201 matching them 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; multiple annular grooves 20 are provided for multi-layer sealing, and the annular grooves 20 located at both ends are particularly important. While using O-rings 201 for sealing, suitable retaining rings can also be used for auxiliary sealing.

[0037] Considering that there is no component for slowing down the wear at the connection between the rotating body 2 and the rotating shaft 1 in the existing structure, the present invention provides a detachable wear assembly 5 on the rotating shaft to protect the rotating shaft 1. Figure 3-4 As shown,

[0038] Specifically, the wear assembly 5 includes at least two groups of wear plates 50, a plurality of connecting ears 51 and a plurality of connecting bolts 52. The wear plate 50 is arc-shaped, and its two ends are respectively provided with a chimeric arc-shaped step 500 integrally formed therewith, and the chimeric arc-shaped steps 500 located on both sides of the wear plate 50 match each other, and the connecting ear 51 is fixedly connected to the side wall of the chimeric arc-shaped step 500 away from the center of the wear plate 50, and the connecting ear 51 is provided with a connecting hole 510 matching the connecting bolt 52; a complete annular protection ring is formed by splicing multiple groups of wear plates 50 (two groups are taken as an example in the present utility model), and its The advantage is that when the wear plate 50 is severely worn, the wear plate 50 can be easily replaced without disassembling the rotating shaft 1 and the rotating body 2, which greatly reduces the maintenance difficulty of the central rotary joint and indirectly reduces the maintenance cost of the central rotary joint. The contact position of the two wear plates 50 is provided with matching interlocking arc steps 500. On the basis of connecting the two wear plates 50 through the connecting ear 51, the problem of tilting of the installed wear plate 50 is avoided to a certain extent. For example, if the interlocking arc step 500 is not provided, the middle position of the wear plate may be warped, causing the annular protective ring to be "V" shaped as a whole.

[0039] Taking into account that the two wear plates 50 are only connected to each other and then sleeved on the rotating shaft 1, there may be a possibility that the rotation of the rotating shaft 1 and the wear plate 50 is not synchronized, which may cause the rotating shaft 1 and the rotating body 2 to rotate relative to the wear plate 50 at the same time, aggravating the wear of the rotating shaft 1, the rotating body 2 and the wear plate 50, the wear plate 50 is synchronized by fixing the wear plate 50 to the rotating shaft 1. Specifically, the connecting ear 51 corresponding to the position of the wear plate 50 is fixedly connected to the curved side wall at the step of the rotating shaft 1, and positioning grooves 11 corresponding to the number of the wear plates 50 are evenly provided on the flat side wall at the step of the rotating shaft 1; the two groups of wear plates 50 are connected to the rotating shaft 1 by providing connecting ears 51 corresponding to the position of the connecting ears 51 on the wear plate 50 on the side wall of the rotating shaft 1.

[0040] Taking into account that the rotating shaft 1 and the wear plate 50 are synchronized simply by the connecting ear 51 and the connecting bolt 52, the main force point during rotation is located at the position of the connecting ear 51, and the connecting ear 51 may break during long-term operation, the synchronization of the rotating shaft 1 and the wear plate is strengthened. Specifically, the side of the wear plate 50 in contact with the plane side wall of the rotating shaft 1 is provided with a positioning protrusion 501 matching the positioning groove 11; in order to further strengthen the connection effect between the rotating shaft 1 and the wear plate 50, a positioning groove 11 is provided on the plane side wall of the rotating shaft 1 at the step, and a positioning protrusion 501 matching the positioning groove 11 is provided on the wear plate 50, which increases the force points of the wear plate 50, reduces the burden on the connecting ear 51, and further reduces the maintenance rate of the wear plate 50.

[0041] Considering that the wear during rotation is mutual, although the wear sheet 50 provided for the rotary shaft 1 can protect the rotary shaft 1, the connecting flange 4 in contact with the wear sheet 50 is also subject to wear. Compared with replacing or repairing the rotary shaft 1, replacing the connecting flange 4 is simpler and less costly. However, in order to further optimize the maintenance process and reduce the maintenance cost, the connecting flange 4 is also protected to a certain extent, as shown in the attached figure. Figure 5 As shown,

[0042] Specifically, a mounting groove 40 matching the wear plate 50 is provided on the side wall of the connecting flange 4 close to the wear plate 50, and a secondary wear plate 50a matching the wear plate 50 is provided in the mounting groove 40; a corresponding mounting groove 40 is provided on the connecting flange 4, and the secondary wear plate 50a is assembled, so that the original relative rotation and friction between the rotating shaft 1 and the connecting flange 4 are converted into friction between the wear plate 50 and the secondary wear plate 50a, further reducing maintenance costs.

[0043] Considering that the method of using the positioning protrusion 501 and the positioning groove 11 to synchronize the rotating shaft 1 and the wear plate 50 may have the following problems: after a long period of operation, the positioning protrusion 501 and the positioning groove 11 may become adhered, and the external force cannot directly act on the positioning protrusion 501, making it difficult to remove the wear plate 50. In severe cases, the rotating shaft 1 may even be damaged during the removal process. In order to address the above situation, protective preparations are made in advance, as shown in the attached Figure 5-6 As shown;

[0044] Specifically, an inner countersunk hole 110 is provided on the bottom wall of the positioning groove 11, and an inner countersunk bolt 111 is placed in the inner countersunk hole 110. A lateral hole 12 is provided on the curved side wall of the rotating shaft 1, which passes through the lower end of the inner countersunk hole 110. The lower end of the inner countersunk bolt 111 is located in the lateral hole 12 and the lower end of the inner countersunk bolt 111 does not contact the bottom wall of the lateral hole 12; the inner countersunk hole 110 is set in the positioning groove 11 in advance, and the inner countersunk bolt 111 matching it is buried in the inner countersunk hole 110. During normal operation, the inner countersunk bolt 111 does not contact the positioning protrusion 501. When the wear plate 50 needs to be replaced and the above-mentioned difficulties in replacement occur, external force can be directly applied to the bottom of the inner countersunk bolt 111 through the lateral hole 12 set in advance, and the wear plate 50 can be indirectly pushed out for replacement by lifting the inner countersunk bolt 111.

[0045] Specifically, the lateral hole 12 is provided with a wedge 120 that matches it. The length of the wedge 120 is greater than the length of the lateral hole 12, and the wedge 120 is located at one end of the lateral hole 12 and is inclined. In order to further facilitate the replacement of the wear plate 50 and avoid finding a suitable tool during replacement, the internal countersunk bolt 111 is inserted into the lateral hole 12 to lift it, and the central rotary joint is matched with the wedge 120 that matches the lateral hole 12 as a disassembly and assembly tool. Due to the inclined surface setting at the front end of the wedge 120, when in use, the wear plate 50 can be easily replaced by inserting one end of the wedge 120 into the lateral hole 12 and then gently tapping the other end of the wedge 120.

[0046] 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 swivel joint with a wear plate, characterized in that: include: A rotary shaft (1), the rotary shaft (1) being a stepped cylinder, a central oil passage (10) being provided in the center of the rotary shaft (1) along the axial direction, an oil inlet passage (100) being provided in the periphery of the central oil passage (10) along the axial direction, and a wear assembly (5) being provided at the step of the rotary shaft (1); A rotating body (2), the rotating body (2) being sleeved on the outside of the rotating shaft (1), a plurality of annular grooves (20) and a plurality of oil outlet passages (21) being provided on an inner side wall of the rotating body (2), the plurality of oil outlet passages (21) being respectively located between the plurality of annular grooves (20), the plurality of oil outlet passages (21) being respectively connected to the plurality of oil inlet passages (100), and the plurality of oil outlet passages (21) being connected to an oil outlet pipe (210) at one end away from the oil inlet passage (100); The end of the rotating body (2) away from the rotating shaft (1) is provided with an end cover (3) matching the rotating body (2), and the end of the rotating body (2) close to the step of the rotating shaft (1) is provided with a connecting flange (4) detachably connected to the rotating body (2); At least one detection hole (13) is provided on a curved side wall at one end of the rotary shaft (1) away from the rotary body (2), and the detection hole (13) is communicated with the oil inlet passage (100).

2. A central swivel joint with a wear plate 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 swivel joint with a wear plate according to claim 1, characterized in that: The wear assembly (5) includes at least two groups of wear plates (50), a plurality of connecting ears (51) and a plurality of connecting bolts (52). The wear plate (50) is arc-shaped, and both ends thereof are provided with a chimeric arc-shaped step (500) integrally formed therewith, and the chimeric arc-shaped steps (500) located on both sides of the wear plate (50) match each other. The connecting ear (51) is fixedly connected to the side wall of the chimeric arc-shaped step (500) away from the center of the wear plate (50), and the connecting ear (51) is provided with a connecting hole (510) matching the connecting bolt (52).

4. A central swivel joint with a wear plate according to claim 3, characterized in that: The connecting ear (51) corresponding to the position of the wear plate (50) is fixedly connected to the curved side wall at the step of the rotary shaft (1), and positioning grooves (11) corresponding to the number of the wear plates (50) are evenly provided on the flat side wall at the step of the rotary shaft (1).

5. The central swivel joint with a wear plate according to claim 4, characterized in that: A positioning protrusion (501) matching the positioning groove (11) is provided on the side of the wear plate (50) that contacts the plane side wall of the rotary shaft (1).

6. The central swivel joint with a wear plate according to claim 4, characterized in that: A mounting groove (40) matching the wear plate (50) is provided on a side wall of the connecting flange (4) close to the wear plate (50), and a secondary wear plate (50a) matching the wear plate (50) is provided in the mounting groove (40).

7. The central swivel joint with a wear plate according to claim 4, characterized in that: An inner countersunk hole (110) is provided on the bottom wall of the positioning groove (11), and an inner countersunk bolt (111) is placed in the inner countersunk hole (110). A lateral hole (12) is provided on the curved side wall of the rotary shaft (1) and is connected to the lower end of the inner countersunk hole (110). The lower end of the inner countersunk bolt (111) is located in the lateral hole (12) and does not contact the bottom wall of the lateral hole (12).

8. The central swivel joint with a wear plate according to claim 7, characterized in that: The lateral hole (12) is provided with a wedge (120) matched therewith, the length of the wedge (120) is greater than the length of the lateral hole (12), and the wedge (120) is located at one end of the lateral hole (12) and is inclined.

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