Slip rings and rotary joints

Abstract

The present application provides a slip ring and a rotary joint, wherein the slip ring comprises a housing, a rotating shaft and a sealing member. A mounting hole is provided on the housing, at least two mounting grooves are provided on the hole wall of the mounting hole, and a first channel penetrating to the mounting hole is provided on the housing along the radial direction of the slip ring. The rotating shaft is rotatably inserted into the mounting hole of the housing, and the rotating shaft comprises a second channel provided along the axial direction of the slip ring, a third channel provided along the radial direction of the slip ring and at least two fourth channels, the third channel, the second channel and the first channel are interconnected, the second channel, the fourth channel and the mounting groove are interconnected, and a flowing medium is provided in the second channel. There are at least two sealing members, and the sealing members are provided in the mounting groove, and part of the flowing medium in the second channel flows into the mounting groove through the fourth channel and acts on the sealing member. In this way, the contact torque between the sealing member and the rotating shaft can be reduced, thereby reducing the wear of the sealing member and increasing the service life of the sealing member.

Description

Technical Field

[0001] The invention relates to the technical field of slip rings, and in particular to a slip ring and a rotary joint. Background Art

[0002] Intelligence and automation have become an unstoppable development trend in the modern manufacturing industry. As an important symbol of advanced intelligent motion equipment, slip rings are widely used in the rotary joints of automatic processing equipment, smart cameras, robotic arms, robots and other intelligent devices, enabling slip rings to provide reliable energy and signals for these intelligent devices.

[0003] At present, the slip ring includes a housing and a rotating shaft mounted on the housing, and a sealing assembly is arranged between the contact surfaces of the housing and the rotating shaft. However, when the rotating shaft and the housing rotate relative to each other, the contact torque between the sealing assembly and the rotating shaft is too large, resulting in accelerated wear of the sealing assembly, thereby reducing the service life of the sealing assembly.

[0004] Therefore, how to reduce the torque of the sealing assembly and reduce the wear is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0005] The main purpose of the present invention is to provide a slip ring and a rotary joint, aiming to solve the technical problem that the contact torque of the sealing component is too large, resulting in accelerated wear of the sealing component, thereby reducing the service life of the sealing component.

[0006] To achieve the above object, the present invention provides a slip ring, comprising:

[0007] A housing, wherein a mounting hole is provided on the housing, at least two mounting grooves are provided on the hole wall of the mounting hole, and the housing is provided with a first passage penetrating to the mounting hole along the radial direction of the slip ring;

[0008] A rotating shaft is rotatably inserted into the mounting hole of the housing, the rotating shaft comprises a second channel opened along the axial direction of the slip ring, a third channel and at least two fourth channels opened along the radial direction of the slip ring, the third channel, the second channel and the first channel are interconnected, the second channel, the fourth channel and the mounting groove are interconnected, and a flowing medium is present in the second channel;

[0009] There are at least two sealing members, which are arranged in the installation groove. A portion of the flowing medium in the second channel flows into the installation groove through the fourth channel and acts on the sealing members.

[0010] In an optional embodiment, the sealing member is respectively in interference connection with the groove wall of the mounting groove and the outer peripheral wall of the rotating shaft.

[0011] In an optional embodiment, a groove is formed on a side of the sealing member facing the rotating shaft, and the flowing medium in the second channel flows into the groove.

[0012] In an optional embodiment, a dimension of the groove along the axial direction of the slip ring is greater than or equal to a width of the fourth channel.

[0013] In an optional embodiment, the groove is in a shape of a square, a triangle, an arc or a trapezoid.

[0014] In an optional embodiment, when there are two mounting grooves, the mounting grooves are arranged on the hole wall of the mounting hole along the axial direction of the slip ring and are located on both sides of the first channel;

[0015] There are two sealing members, and each sealing member is correspondingly arranged in one of the installation grooves.

[0016] In an optional embodiment, the housing is provided with a first limiting step and a second limiting step, and the rotating shaft is provided with a third limiting step and a fourth limiting step at positions corresponding to the first limiting step and the second limiting step, respectively;

[0017] The slip ring also includes:

[0018] A first bearing is sleeved on the third limiting step of the rotating shaft, and an outer peripheral wall of the first bearing is limited by the first limiting step;

[0019] The second bearing is sleeved on the fourth limiting step of the rotating shaft, and the outer peripheral wall of the second bearing is in contact with the second limiting step.

[0020] In an optional embodiment, the slip ring further includes:

[0021] A fixed retaining ring is sleeved on the rotating shaft and abuts against the second bearing, so as to fix the second bearing.

[0022] In an optional embodiment, the sealing member is a Gray ring.

[0023] To achieve the above object, the present invention provides a rotary joint, which includes the slip ring described above.

[0024] The present invention provides a slip ring and a rotary joint, wherein the slip ring comprises a shell, a rotating shaft and a sealing member. A mounting hole is provided on the shell, at least two mounting grooves are provided on the hole wall of the mounting hole, and a first channel penetrating to the mounting hole is provided on the shell along the radial direction of the slip ring. The rotating shaft is rotatably inserted into the mounting hole of the shell, and the rotating shaft comprises a second channel provided along the axial direction of the slip ring, a third channel provided along the radial direction of the slip ring, and at least two fourth channels, the third channel, the second channel and the first channel are interconnected, the second channel, the fourth channel and the mounting groove are interconnected, and a flowing medium is present in the second channel. There are at least two sealing members, and the sealing members are provided in the mounting groove, and part of the flowing medium in the second channel flows into the mounting groove through the fourth channel and acts on the sealing member. That is, part of the flowing medium in the second channel flows through the fourth channel to the seal in the mounting groove, so that the flowing medium can directly act on the seal, thereby pushing the surface of the seal facing the rotating shaft toward the shell through the flowing medium. Such an arrangement can reduce the contact torque between the seal and the rotating shaft, thereby reducing the wear of the seal and increasing the service life of the seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments or exemplary embodiments of the present invention, the drawings required for use in the embodiments or exemplary descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a structural cross-sectional view of a slip ring according to an embodiment of the present invention;

[0027] Figure 2 for Figure 1 A partial enlarged view of part A;

[0028] Figure 3 for Figure 1 A partial enlarged view of part B.

[0029] Description of reference numerals:

[0030] 100 - housing, 110 - mounting hole, 120 - mounting groove, 130 - first channel, 150 - first limiting step, 160 - second limiting step;

[0031] 200 - rotating shaft, 210 - second channel, 220 - third channel, 230 - fourth channel, 250 - third limiting step, 260 - fourth limiting step;

[0032] 300-seal, 310-groove;

[0033] 400-first bearing;

[0034] 500-second bearing;

[0035] 600-Fixed circlip.

[0036] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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 ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0039] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0040] like Figures 1 to 3 As shown, the present invention provides a slip ring.

[0041] Specifically, the slip ring includes a housing 100, a rotating shaft 200 and a sealing member 300. A mounting hole 110 is provided on the housing 100, at least two mounting grooves 120 are provided on the hole wall of the mounting hole 110, and a first channel 130 penetrating the mounting hole 110 is provided in the housing 100 along the radial direction of the slip ring. The rotating shaft 200 is rotatably inserted in the mounting hole 110 of the housing 100, and the rotating shaft 200 includes a second channel 210 provided along the axial direction of the slip ring, a third channel 220 and at least two fourth channels 230 provided along the radial direction of the slip ring, the third channel 220, the second channel 210 and the first channel 130 are interconnected, the second channel 210, the fourth channel 230 and the mounting groove 120 are interconnected, and a flowing medium is present in the second channel 210. There are at least two seals 300, and the seals 300 are arranged in the installation groove 120. Part of the flow medium in the second channel 210 flows into the installation groove through the fourth channel 230 and acts on the seal 300, that is, the flow medium pushes the surface of the seal 300 on the side of the rotating shaft 200 to be squeezed toward the direction of the shell 100 until the seal 300 and the rotating shaft 200 abut against each other or separate from each other.

[0042] In this embodiment, the radial direction of the slip ring and the axial direction of the slip ring are as follows: Figure 1 Indicated in the figure. That is, the first channel 130, the third channel 220 and the fourth channel 230 are arranged parallel to each other, and are respectively arranged perpendicular to the second channel 210. Among them, the first channel 130 is arranged in communication with the mounting hole 110, but the first channel 130 does not completely penetrate the housing 100 along the radial direction of the slip ring; the third channel 220 and the fourth channel 230 are respectively arranged in communication with the second channel 210, but the third channel 220 and the fourth channel 230 do not completely penetrate the rotating shaft 200 along the radial direction of the slip ring. The second channel 210 is a blind hole from one end of the rotating shaft 200 along the axial direction of the slip ring but does not penetrate the other end of the rotating shaft 200.

[0043] The housing 100 and the rotating shaft 200 rotate relative to each other with the central axis of the rotating shaft 200 as the rotation center. The so-called relative rotation means that when the housing 100 rotates with the central axis of the rotating shaft 200, the rotating shaft 200 is fixed; and when the rotating shaft 200 rotates with the central axis of the rotating shaft 200, the housing 100 is fixed. In this embodiment, it is preferred that the rotating shaft 200 rotates and the housing 100 is fixed.

[0044] The second channel 210 can be filled with a gas or liquid medium, which can flow in the second channel 210, and most of the gas or liquid medium flows to the first channel 130 through the third channel 220 and flows out from the first channel 130, and a small part of the gas or liquid medium can flow to the seal 300 in the mounting groove 120 through the fourth channel 230, and act on the seal 300 to push the surface of the seal 300 on the side of the rotating shaft 200 to be squeezed toward the direction of the housing 100, thereby reducing the contact torque between the seal 300 and the rotating shaft 200, reducing the wear of the seal 300, and increasing the service life of the seal 300.

[0045] In actual application, the slip ring is applied to a rotary joint structure. Specifically, when gas is filled into the second channel 210, the rotary joint can be a pneumatic rotary joint; when liquid is filled into the second channel 210, the rotary joint can be a hydraulic rotary joint. It should be noted that the slip ring can also be applied to other rotary structures, such as: rotary air claws, rotary hydraulic suction cups, etc., and its specific application scenarios are not limited in this application.

[0046] In the technical solution provided in the present application, the slip ring includes a housing 100, a rotating shaft 200 and a sealing member 300. A mounting hole 110 is provided on the housing 100, at least two mounting grooves 120 are provided on the hole wall of the mounting hole 110, and a first channel 130 penetrating the mounting hole 110 is provided in the housing 100 along the radial direction of the slip ring. The rotating shaft 200 is rotatably inserted into the mounting hole 110 of the housing 100, and the rotating shaft 200 includes a second channel 210 provided along the axial direction of the slip ring, a third channel 220 and at least two fourth channels 230 provided along the radial direction of the slip ring, the third channel 220, the second channel 210 and the first channel 130 are interconnected, the second channel 210, the fourth channel 230 and the mounting groove 120 are interconnected, and a flowing medium is provided in the second channel 210. There are at least two seals 300, which are arranged in the mounting groove 120. A portion of the flow medium in the second channel 210 flows into the mounting groove through the fourth channel 230 and acts on the seal 300. That is, a portion of the flow medium (gas or liquid) in the second channel 210 flows to the seal 300 in the mounting groove 120 through the fourth channel 230, so that the flow medium can directly act on the seal 300, so that the surface of the seal 300 on one side of the rotating shaft 200 can be pushed by the flow medium to be squeezed in the direction of the housing 100. In this way, the contact torque between the seal 300 and the rotating shaft 200 can be reduced, thereby reducing the wear of the seal 300 and increasing the service life of the seal 300.

[0047] In addition, since the flowing medium flowing into the installation groove 120 can push the surface of the seal 300 on the side of the rotating shaft 200 to be squeezed toward the direction of the housing 100, the contact torque between the seal 300 and the rotating shaft 200 is reduced. In this way, the resistance of the seal 300 to the rotation of the rotating shaft 200 is reduced, that is, the rotation of the rotating shaft 200 is smoother, thereby meeting the application scenario of a small motor driving the rotating shaft 200 to rotate, thereby increasing the versatility of the slip ring.

[0048] Furthermore, the sealing member 300 is respectively connected with the groove wall of the installation groove 120 and the outer peripheral wall of the rotating shaft 200 in interference fit, so as to seal the gap between the housing 100 and the rotating shaft 200 . In combination with the above description, the flowing medium in the second channel 210 flows through the fourth channel 230 to the seal 300 in the mounting groove 120, so that the flowing medium can directly act on the seal 300. At this time, the surface of the seal 300 facing the rotating shaft 200 can be pushed by the flowing medium to be squeezed toward the direction of the housing 100, so that the state of the seal 300 and the rotating shaft 200 changes from an interference connection state to a state of mutual abutment (or, in some embodiments, when the tension applied by the flowing medium on the seal 300 is large enough, part of the surface of the seal 300 facing the rotating shaft 200 may be compressed to a state separated from the outer peripheral wall of the rotating shaft 200). In this way, the contact torque between the seal 300 and the rotating shaft 200 will be reduced; and, in this state, if the rotating shaft 200 rotates, the wear of the seal 300 will also be reduced accordingly (compared with the state of interference connection between the seal 300 and the rotating shaft 200), thereby increasing the service life of the seal 300.

[0049] Furthermore, if Figure 2 As shown, a groove 310 is provided on the side of the seal 300 facing the rotating shaft 200, and the flowing medium in the second channel 210 flows into the groove 310, so that the flowing medium can act on the entire seal 300 through the groove wall of the groove 310, and squeeze or compress the seal 300 toward the housing 100. The function of the groove 310 is to enable the flowing medium in the fourth channel 230 that flows into the mounting groove 120 to flow completely into the groove 310, so that the flowing medium can apply a thrust to the groove wall of the groove 310, that is, the seal 300 can be squeezed toward the housing 100, instead of applying a thrust from the two side surfaces of the seal 300 or the surface of the side of the seal 300 away from the rotating shaft 200, so that the thrust of the seal 300 in all directions remains balanced.

[0050] Further, the dimension of the groove 310 along the axial direction of the slip ring is greater than or equal to the width of the fourth channel 230. Here, the width of the fourth channel 230 is the dimension of the fourth channel 230 along the axial direction of the slip ring, that is, the dimension of the groove 310 along the axial direction of the slip ring is greater than or equal to the dimension of the fourth channel 230 along the axial direction of the slip ring, so that the flow medium in the fourth channel 230 can completely flow into the groove 310, preventing the flow medium from flowing from the gap between the seal 300 and the rotating shaft 200 to the two side surfaces of the seal 300 and the surface of the seal 300 away from the rotating shaft. It should be noted that the two side surfaces of the seal 300 are the surfaces on both sides along the axial direction of the slip ring.

[0051] Furthermore, the shape of the groove 310 is a square, a triangle, an arc, a trapezoid or other irregular shapes. The shape of the fourth channel 230 can be the same as the groove 310, or a different shape from the groove 310. For example, the shape of the fourth channel 230 can be a funnel shape. As long as the dimension of the end of the fourth channel 230 close to the groove 310 along the axial direction of the slip ring is less than or equal to the dimension of the end of the groove 310 close to the fourth channel 230 along the axial direction of the slip ring, the shapes of the groove 310 and the fourth channel 230 are not limited in the present application.

[0052] In this embodiment, the groove 310 is preferably a semicircular shape, and the fourth channel 230 is preferably a circular channel.

[0053] Further, the number of the mounting grooves 120 may be two or more. Specifically, when there are two mounting grooves 120, the mounting grooves 120 are arranged on the hole wall of the mounting hole 110 along the axial direction of the slip ring, and are located on both sides of the first channel 130. Here, the two sides of the first channel 130 are the two sides along the axial direction of the slip ring. In this way, the two sides of the first channel 130 can be sealed.

[0054] Two sealing members 300 are provided correspondingly, and each sealing member 300 is provided in one mounting groove 120. It should be noted that the number of mounting grooves 120 can also be more than two, for example, the number of mounting grooves 120 is set to three, one of which is provided on the hole wall of the mounting hole 110 located on one side of the first channel 130, and the other two are provided on the hole wall of the mounting hole 110 located on the other side of the first channel 130. Here, one side and the other side of the first channel 130 are the two sides of the first channel 130 described above.

[0055] Furthermore, combined with Figures 1 to 3As shown, the housing 100 is provided with a first limiting step 150 and a second limiting step 160, and the rotating shaft 200 is provided with a third limiting step 240 and a fourth limiting step 250 at positions corresponding to the first limiting step 150 and the second limiting step 160. The slip ring also includes a first bearing 400 and a second bearing 500. The first bearing 400 is sleeved on the third limiting step 240 of the rotating shaft 200, and the outer peripheral wall of the first bearing 400 is limited by the first limiting step 150; the second bearing 500 is sleeved on the fourth limiting step 250 of the rotating shaft 200, and the outer peripheral wall of the second bearing 500 is in contact with the second limiting step 160. That is, the first bearing 400 is fixed to the housing 100 and the rotating shaft 200 through the first limiting step 150 and the third limiting step 240.

[0056] In order to fix the second bearing 500, the slip ring in this embodiment further includes a fixing retaining spring 600, which is sleeved on the rotating shaft 200 and abuts against the second bearing 500 to fix the second bearing 500. That is, the second bearing 500 is fixed to the housing 100 and the rotating shaft 200 through the second limiting step 160, the fourth limiting step 250 and the fixing retaining spring 600. In this way, the housing 100 and the rotating shaft 200 can rotate relative to each other through the cooperation between the first bearing 400 and the second bearing 500.

[0057] Furthermore, the sealing member 300 is preferably a Glay ring. Of course, in other embodiments, the sealing member 300 may also be other types of sealing rings or sealing rings, etc., which are not limited in the present application.

[0058] In the technical solution provided in the present application, the slip ring includes a housing 100, a rotating shaft 200 and a sealing member 300. A mounting hole 110 is provided on the housing 100, at least two mounting grooves 120 are provided on the hole wall of the mounting hole 110, and a first channel 130 penetrating the mounting hole 110 is provided in the housing 100 along the radial direction of the slip ring. The rotating shaft 200 is rotatably inserted into the mounting hole 110 of the housing 100, and the rotating shaft 200 includes a second channel 210 provided along the axial direction of the slip ring, a third channel 220 and at least two fourth channels 230 provided along the radial direction of the slip ring, the third channel 220, the second channel 210 and the first channel 130 are interconnected, the second channel 210, the fourth channel 230 and the mounting groove 120 are interconnected, and a flowing medium is provided in the second channel 210. There are at least two seals 300, which are arranged in the mounting groove 120. A portion of the flow medium in the second channel 210 flows into the mounting groove through the fourth channel 230 and acts on the seal 300. That is, a portion of the flow medium (gas or liquid) in the second channel 210 flows to the seal 300 in the mounting groove 120 through the fourth channel 230, so that the flow medium can directly act on the seal 300, so that the surface of the seal 300 on one side of the rotating shaft 200 can be pushed by the flow medium to be squeezed in the direction of the housing 100. In this way, the contact torque between the seal 300 and the rotating shaft 200 can be reduced, thereby reducing the wear of the seal 300 and increasing the service life of the seal 300.

[0059] Based on the above embodiments, the present application also provides a rotation joint.

[0060] In this embodiment, the rotary joint includes the slip ring in the above embodiment. The rotary joint can be applied to automatic processing equipment, smart cameras, mechanical arms, robots and other smart devices, and the application scenarios can be pneumatic mechanical claws, hydraulic suction cups, etc., which are not limited here.

[0061] Since the rotary joint in this embodiment includes the slip ring in the above embodiment, that is, the rotary joint in this embodiment includes all the technical features and technical effects achieved in the slip ring in the above embodiment, specific details can be referred to the description in the above embodiment, which will not be repeated here.

[0062] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A slip ring, characterized in that: The slip ring comprises: A housing, wherein a mounting hole is provided on the housing, at least two mounting grooves are provided on the hole wall of the mounting hole, and the housing is provided with a first passage penetrating to the mounting hole along the radial direction of the slip ring; A rotating shaft is rotatably inserted into the mounting hole of the housing, the rotating shaft comprises a second channel opened along the axial direction of the slip ring, a third channel and at least two fourth channels opened along the radial direction of the slip ring, the third channel, the second channel and the first channel are interconnected, the second channel, the fourth channel and the mounting groove are interconnected, and a flowing medium is present in the second channel; There are at least two sealing members, which are arranged in the installation groove. A portion of the flowing medium in the second channel flows into the installation groove through the fourth channel and acts on the sealing members.

2. The slip ring according to claim 1, characterized in that: The sealing member is respectively connected with the groove wall of the installation groove and the outer peripheral wall of the rotating shaft by interference.

3. The slip ring according to claim 2, characterized in that: The sealing member is provided with a groove on one side facing the rotating shaft, and the flowing medium in the second channel flows into the groove.

4. The slip ring according to claim 3, characterized in that: The dimension of the groove along the axial direction of the slip ring is greater than or equal to the width of the fourth channel.

5. The slip ring according to claim 4, characterized in that: The shape of the groove is square, triangle, arc or trapezoid.

6. The slip ring according to claim 5, characterized in that: When there are two mounting grooves, the mounting grooves are arranged on the hole wall of the mounting hole along the axial direction of the slip ring and are located on both sides of the first channel; There are two sealing members, and each sealing member is correspondingly arranged in one of the installation grooves.

7. The slip ring according to any one of claims 1 to 6, characterized in that: The housing is provided with a first limiting step and a second limiting step, and the rotating shaft is provided with a third limiting step and a fourth limiting step at positions corresponding to the first limiting step and the second limiting step respectively; The slip ring also includes: A first bearing is sleeved on the third limiting step of the rotating shaft, and an outer peripheral wall of the first bearing is limited by the first limiting step; The second bearing is sleeved on the fourth limiting step of the rotating shaft, and the outer peripheral wall of the second bearing is in contact with the second limiting step.

8. The slip ring according to claim 7, characterized in that: The slip ring also includes: A fixed retaining ring is sleeved on the rotating shaft and abuts against the second bearing, so as to fix the second bearing.

9. The slip ring according to any one of claims 1 to 6, characterized in that: The sealing element is a Gray ring.

10. A rotary joint, characterized in that: The rotary joint comprises a slip ring as claimed in any one of claims 1 to 9.

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