A hydraulic pipe joint

Abstract

The present invention provides a hydraulic pipe joint, which relates to the technical field of engineering machinery. The hydraulic pipe joint includes a sub-tube and a main tube. The sub-tube includes a first fixed tube and a first rotating tube rotatably connected to the first fixed tube, and the first rotating tube is provided with a rotating tenon. The main tube includes a second fixed tube and a second rotating tube rotatably connected to one end of the second fixed tube. An avoidance tenon groove is provided in the second fixed tube, and a rotating tenon groove is provided in the second rotating tube, and the avoidance tenon groove and the rotating tenon groove can correspond to each other in the axial direction. When the sub-tube is inserted into the main tube, the rotating tenon passes through the avoidance tenon groove and cooperates with the rotating tenon groove, so that the first rotating tube and the second rotating tube are relatively fixed, and then the second rotating tube can drive the first rotating tube to rotate a preset angle, so that the rotating tenon is staggered with the avoidance tenon groove in the axial direction, thereby preventing the sub-tube from separating from the main tube. The hydraulic pipe joint is simple to operate during installation and connection, and is more convenient to install.

Description

Technical Field

[0001] The invention relates to the technical field of engineering machinery, and in particular to a hydraulic pipe joint. Background Art

[0002] Hydraulic pipe joints are components that connect two high-pressure oil pipes in the hydraulic system of construction machinery. After a long period of operation, the oil pipe joints of construction machinery will leak slightly, and the hydraulic pipe joints need to be reinstalled regularly. Currently, most hydraulic pipe joints use threaded connections or flange connections, which are complicated to install and inconvenient. Summary of the invention

[0003] The purpose of the present invention is to provide a hydraulic pipe joint, which is easy to operate during installation and connection and more convenient to install.

[0004] The embodiments of the present invention can be implemented as follows:

[0005] The embodiment provides a hydraulic pipe joint, comprising a sub-pipe and a main pipe;

[0006] The sub-tube includes a first fixed tube and a first rotating tube rotatably connected to the first fixed tube, and the first rotating tube is provided with a rotating tenon;

[0007] The mother tube includes a second fixed tube and a second rotating tube rotatably connected to one end of the second fixed tube, and the end of the second fixed tube away from the second rotating tube is used for the insertion of the sub-tube; the second fixed tube is provided with an avoidance tenon groove; the second rotating tube is provided with a rotating tenon groove, and the avoidance tenon groove and the rotating tenon groove can correspond to each other in the axial direction;

[0008] When the child tube is inserted into the mother tube, the rotating tenon passes through the avoidance tenon groove and cooperates with the rotating tenon groove, so that the first rotating tube and the second rotating tube are relatively fixed, and then the second rotating tube can drive the first rotating tube to rotate a preset angle, so that the rotating tenon is staggered with the avoidance tenon groove in the axial direction, thereby preventing the child tube from separating from the mother tube.

[0009] In an optional embodiment, the first rotating tube is sleeved on the first fixed tube, and a fixed tenon is provided at a portion of the first fixed tube not covered by the first rotating tube. The rotating tenon and the fixed tenon can correspond to each other in the axial direction, and the fixed tenon is used to cooperate with the avoidance tenon groove.

[0010] In an optional embodiment, the portion of the first fixed tube that is not covered by the first rotating tube includes a first section and a second section, the first section and the second section are respectively located at opposite ends of the first rotating tube, an end of the first section away from the first rotating tube is used for inserting into the mother tube, and the first section and the second section are respectively provided with fixing tenons.

[0011] In an optional embodiment, a guiding slope is provided at one end of the fixing tenon arranged in the first section away from the first rotating tube, and the guiding slope is used to guide the fixing tenon to insert into the avoiding tenon groove.

[0012] In an optional embodiment, the mother tube includes a third fixed tube, one end of the second rotating tube is rotatably connected to the second fixed tube, and the other end is rotatably connected to the third fixed tube. When the child tube is inserted into the mother tube, the third fixed tube cooperates with the first section and the second fixed tube cooperates with the second section.

[0013] In an optional embodiment, the third fixing tube is provided with a fixing tenon groove, and the fixing tenon groove is used to cooperate with the fixing tenon provided in the first section.

[0014] In an optional embodiment, a first seal is provided at one end of the first section away from the first rotating tube, and the first seal is used for sealing between the first section and the third fixed tube.

[0015] In an optional embodiment, the first fixed tube includes a fixed seat, which is arranged at an end of the second section away from the first rotating tube, and the fixed seat is provided with a second sealing member, which is used for sealing between the fixed seat and the second fixed tube.

[0016] In an optional embodiment, the second rotating tube and the second fixed tube, and the second rotating tube and the third fixed tube are connected via bearings.

[0017] In an optional embodiment, the first rotating tube is provided with a plurality of rotating tenons at intervals in the circumferential direction, a plurality of rotating tenon grooves are provided in the second rotating tube, a plurality of avoidance tenon grooves are provided in the second fixed tube, the plurality of rotating tenons correspond one-to-one to the plurality of rotating tenon grooves, and the plurality of avoidance tenon grooves correspond one-to-one to the plurality of rotating tenon grooves.

[0018] The beneficial effects of the embodiments of the present invention include:

[0019] The hydraulic pipe joint includes a sub-tube and a mother tube. The sub-tube includes a first fixed tube and a first rotating tube rotatably connected to the first fixed tube, and the first rotating tube is provided with a rotating tenon. The mother tube includes a second fixed tube and a second rotating tube rotatably connected to one end of the second fixed tube, and the end of the second fixed tube away from the second rotating tube is used for the insertion of the sub-tube. An avoidance tenon groove is provided in the second fixed tube, and a rotating tenon groove is provided in the second rotating tube, and the avoidance tenon groove and the rotating tenon groove can correspond to each other in the axial direction. When the sub-tube is inserted into the mother tube, the rotating tenon passes through the avoidance tenon groove and then cooperates with the rotating tenon groove, so that the first rotating tube and the second rotating tube are relatively fixed, and then the second rotating tube can drive the first rotating tube to rotate a preset angle, so that the rotating tenon is staggered with the avoidance tenon groove in the axial direction, thereby preventing the sub-tube from separating from the mother tube. When the sub-tube of the hydraulic pipe joint is inserted into the mother tube, the rotating tenon provided on the first rotating tube of the sub-tube can pass through the avoidance tenon groove provided in the second fixed tube of the mother tube, and then cooperate with the rotating tenon groove in the second rotating tube of the mother tube, so that the first rotating tube on the sub-tube and the second rotating tube on the mother tube are fixed together. Then, the second rotating tube on the mother tube is rotated, and inside the mother tube, the first rotating tube on the sub-tube is synchronously rotated with the second rotating tube by a preset angle. Since the second fixed tube on the mother tube is stationary, that is, the avoidance tenon groove is stationary, the rotating tenon on the first rotating tube no longer corresponds to the avoidance tenon groove after rotation, but is staggered with the avoidance tenon groove in the axial direction, thereby preventing the sub-tube from axially separating from the mother tube and realizing the connection between the sub-tube and the mother tube. When the hydraulic pipe joint is installed and connected, it is only necessary to insert the sub-tube into the mother tube and then rotate the second rotating tube on the mother tube to realize the stable connection between the sub-tube and the mother tube, which is simple to operate and easy to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a structural schematic diagram of a hydraulic pipe joint in an embodiment of the present invention;

[0022] Figure 2 Schematic diagram of the structure of the sub-tube in the first perspective of the embodiment of the present invention;

[0023] Figure 3 2 is a schematic structural diagram of a mother tube in a first viewing angle according to an embodiment of the present invention;

[0024] Figure 4 is a first cross-sectional view of the second rotating tube in an embodiment of the present invention;

[0025] Figure 5Schematic diagram of the structure of the sub-tube in the second viewing angle in the embodiment of the present invention;

[0026] Figure 6 is a cross-sectional view of a sub-tube in an embodiment of the present invention;

[0027] Figure 7 is a structural schematic diagram of a mother tube from a second viewing angle in an embodiment of the present invention;

[0028] Figure 8 1 is an assembly diagram of a bearing in an embodiment of the present invention.

[0029] Icons: 100-hydraulic pipe joint; 110-sub-tube; 111-first fixed tube; 112-rotating tenon; 113-first rotating tube; 114-fixed tenon; 115-first section; 117-second section; 118-roller; 119-guide ramp; 120-first seal; 121-fixed seat; 122-second seal; 130-mother tube; 131-second fixed tube; 132-avoidance tenon; 133-second rotating tube; 134-rotating tenon; 135-third fixed tube; 136-bearing; 137-anti-slip groove; 138-first annular protrusion; 139-second annular protrusion; 140-fixed tenon. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions 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. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0033] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0034] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0035] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0036] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 The present embodiment provides a hydraulic pipe joint 100, which includes a sub-tube 110 and a mother tube 130. The sub-tube 110 includes a first fixed tube 111 and a first rotating tube 113 rotatably connected to the first fixed tube 111. The first rotating tube 113 is provided with a rotating tenon 112. The mother tube 130 includes a second fixed tube 131 and a second rotating tube 133 rotatably connected to one end of the second fixed tube 131, and the end of the second fixed tube 131 away from the second rotating tube 133 is used for the insertion of the sub-tube 110. An avoidance tenon groove 132 is provided in the second fixed tube 131, and a rotating tenon groove 134 is provided in the second rotating tube 133, and the avoidance tenon groove 132 and the rotating tenon groove 134 can correspond to each other in the axial direction. When the child tube 110 is inserted into the mother tube 130, the rotating tenon 112 passes through the avoidance tenon groove 132 and cooperates with the rotating tenon groove 134, so that the first rotating tube 113 and the second rotating tube 133 are relatively fixed, and then the second rotating tube 133 can drive the first rotating tube 113 to rotate a preset angle, so that the rotating tenon 112 is staggered with the avoidance tenon groove 132 in the axial direction, thereby preventing the child tube 110 from separating from the mother tube 130.

[0037] Please refer to Figure 2 and Figure 5In this embodiment, the first fixed tube 111 is used to connect to the hydraulic tube, and the first rotating tube 113 is sleeved on the first fixed tube 111 and can rotate relative to the first fixed tube 111. Among them, the first rotating tube 113 is provided with a plurality of rotating tenons 112 at intervals in the circumferential direction, and the plurality of rotating tenons 112 are evenly distributed in the circumferential direction. The rotating tenon 112 protrudes radially outward, and the rotating tenon 112 extends axially and has a certain length in the axial direction. In addition, in this embodiment, in order to achieve the overall lightweight of the joint, the thickness of the rotating tenon 112 in the circumferential direction gradually decreases radially outward, and the cross-section of the rotating tenon 112 is roughly triangular.

[0038] The first fixed tube 111 is provided with a fixed tenon 114 at a portion not covered by the first rotating tube 113, and the fixed tenon 114 is used to cooperate with the avoidance tenon groove 132. To match the mother tube 130, the portion of the first fixed tube 111 not covered by the first rotating tube 113 includes a first section 115 and a second section 117, which are respectively located at opposite ends of the first rotating tube 113, and the end of the first section 115 away from the first rotating tube 113 is used to insert into the mother tube 130. In other words, the first rotating tube 113 is roughly sleeved in the middle of the first fixed tube 111, so that the first fixed tube 111 has exposed portions at both ends of the first rotating tube 113, which are the first section 115 and the second section 117, and the side where the first section 115 is located is the head of the child tube 110, and the side where the second section 117 is located is the root of the child tube 110. When the child tube 110 is plugged into the mother tube 130, the head is first plugged into the mother tube 130.

[0039] In this embodiment, in order to further improve the connection firmness between the sub-tube 110 and the mother tube 130, the first section 115 and the second section 117 are respectively provided with a fixed tenon 114, and the rotating tenon 112 and the fixed tenon 114 can correspond to each other in the axial direction. The fixed tenon 114 protrudes outward along the radial direction of the sub-tube 110 and extends in the axial direction. The structure of the fixed tenon 114 is the same as that of the rotating tenon 112. In this embodiment, the first section 115 and the second section 117 are respectively provided with a plurality of fixed tenons 114 at intervals along the circumferential direction, and the plurality of fixed tenons 114 on the first section 115, the plurality of rotating tenons 112 on the first rotating tube 113, and the plurality of fixed tenons 114 on the second section 117 correspond to each other in the axial direction. Therefore, before plugging, the first rotating tube 113 is rotated so that the rotating tenons 112 on it correspond to the fixed tenons 114 on the first fixed tube 111 in the axial direction. During plugging, the fixed tenon 114 provided on the first section 115 and the rotating tenon 112 provided on the first rotating tube 113 can pass through the avoidance tenon groove 132 of the mother tube 130 in sequence, so that the sub-tube 110 can be inserted into the mother tube 130. The protruding fixed tenon 114 on the first section 115 and the second section 117 can not only strengthen the connection between the sub-tube 110 and the mother tube 130, but also limit the two ends of the first rotating tube 113 to prevent the first rotating tube 113 from falling off from the first fixed tube 111. In addition, please refer to Figure 6 A plurality of rollers 118 are arranged between the first fixed tube 111 and the first rotating tube 113. The axial direction of the rollers 118 is parallel to the axial direction of the sub-tube 110, so that when the first rotating tube 113 rotates, the friction between the inner wall of the first rotating tube 113 and the outer wall of the first fixed tube 111 can be reduced.

[0040] In this embodiment, the sub-tube 110 is provided with 8 rotating tenons 112 in the circumferential direction, and correspondingly, the first section 115 and the second section 117 are respectively provided with 8 fixed tenons 114 in the circumferential direction. The interval between two adjacent rotating tenons 112 in the circumferential direction is 45°.

[0041] In other embodiments, the first rotating tube 113 may not be sleeved outside the first fixed tube 111, but may be directly rotatably connected to the end of the first fixed tube 111 away from the hydraulic tube, that is, the sub-tube 110 may not be provided with the first section 115, and only needs to be able to be assembled with the main tube 130. In other embodiments, the first fixed tube 111 may not be provided with the fixing tenon 114, and only needs to be able to be plugged and matched with the main tube 130.

[0042] In order to facilitate the matching of the sub-tube 110 and the mother tube 130, in this embodiment, a guide slope 119 is provided at one end of the fixing tenon 114 disposed in the first section 115 away from the first rotating tube 113, and the guide slope 119 is used to guide the fixing tenon 114 to insert into the avoidance tenon groove 132. In this embodiment, the angle between the guide slope 119 and the axial direction is 30°, and the guide slope 119 enables the sub-tube 110 to form a gradually expanding section at the head, and the diameter of the gradually expanding section gradually increases along the direction close to the root of the sub-tube 110, thereby facilitating the alignment connection between the sub-tube 110 and the mother tube 130. In other embodiments, the angle between the guide slope 119 and the axial direction can be set as needed. In other embodiments, the guide slope 119 may not be provided at one end of the fixing tenon 114 disposed in the first section 115 away from the first rotating tube 113.

[0043] In order to improve the sealing performance of the hydraulic pipe joint 100, a first seal 120 is provided at one end of the first section 115 away from the first rotating tube 113. The first seal 120 is a sealing ring, and the first seal 120 is embedded in the head end face of the sub-tube 110. The first fixed tube 111 also includes a fixing seat 121, which is arranged at one end of the second section 117 away from the first rotating tube 113, that is, the fixing seat 121 is located at the root of the sub-tube 110, and the fixing seat 121 is used to connect the hydraulic pipe. The fixing seat 121 is provided with a second seal 122. The second seal 122 is a sealing ring, and the second seal 122 is embedded in the end face of the fixing seat 121 facing the head of the sub-tube 110. The first seal 120 and the second seal 122 are both used for sealing between the sub-tube 110 and the mother tube 130. In other embodiments, the first sealing member 120 and the second sealing member 122 may not be provided, and they only need to be provided according to the requirements of the assembly tightness between the sub-tube 110 and the main tube 130 .

[0044] Please refer to Figure 7 and Figure 8In this embodiment, the mother tube 130 includes a third fixed tube 135, one end of the second rotating tube 133 is rotatably connected to the second fixed tube 131, and the other end is rotatably connected to the third fixed tube 135. The third fixed tube 135 is used to connect the hydraulic pipe. The second rotating tube 133 and the second fixed tube 131, and the second rotating tube 133 and the third fixed tube 135 are connected through a bearing 136. The two ends of the second rotating tube 133 are respectively provided with a first annular protrusion 138, and the first annular protrusion 138 protrudes toward the two ends in the axial direction. The end of the second fixed tube 131 connected to the second rotating tube 133 and the end of the third fixed tube 135 connected to the second rotating tube 133 are respectively provided with a second annular protrusion 139, and the second annular protrusion 139 protrudes toward one end close to the second rotating tube 133. The inner diameter of the first annular protrusion 138 is larger than the outer diameter of the second annular protrusion 139, so that in the radial direction, there is a gap between the first annular protrusion 138 and the second annular protrusion 139, and the bearing 136 is arranged in the gap. The outer ring of the bearing 136 is fixed to the inner surface of the first annular protrusion 138, and the inner ring of the bearing 136 is fixed to the outer surface of the second annular protrusion 139. The two first annular protrusions 138 and the two second annular protrusions 139 are overlapped together one by one through the bearing 136, so that the second rotating tube 133 can rotate relative to the second fixed tube 131 and the third fixed tube 135. In other embodiments, the second rotating tube 133 and the second fixed tube 131 and the third fixed tube 135 may not be connected by the bearing 136, and may also be connected by sleeve connection, as long as the structure of the mother tube 130 is stable and the second rotating tube 133 can rotate relative to the second fixed tube 131 and the third fixed tube 135.

[0045] In this embodiment, a plurality of avoidance tenons 132 are provided in the second fixed tube 131, and the plurality of avoidance tenons 132 are evenly spaced in the circumferential direction, and a plurality of rotation tenons 134 are provided in the second rotating tube 133, and the plurality of rotation tenons 134 are evenly spaced in the circumferential direction. The plurality of avoidance tenons 132 correspond to the plurality of rotation tenons 134 one by one. The plurality of rotation tenons 112 correspond to the plurality of rotation tenons 134 one by one. In this embodiment, corresponding to the sub-tube 110, eight avoidance tenons 132 are spaced in the circumferential direction in the second fixed tube 131, and eight rotation tenons 134 are provided in the second rotating tube 133. The third fixed tube 135 is provided with a fixed tenon 140, and the fixed tenon 140 is used to cooperate with the fixed tenon 114 provided in the first section 115. The third fixed tube 135 is provided with a plurality of fixed tenons 140, and in this embodiment, eight fixed tenons 140 are spaced in the circumferential direction. In other embodiments, the first rotating tube 113 may be provided with only one rotating tenon 112 in the circumferential direction, and the first section 115 and the second section 117 may be provided with one fixed tenon 114 in the circumferential direction respectively. In this case, correspondingly, the second fixed tube 131 may be provided with only one avoiding tenon groove 132 in the circumferential direction, the second rotating tube 133 may be provided with only one rotating tenon groove 134, and the third fixed tube 135 may be provided with only one fixed tenon groove 140. Similarly, six tenons may be provided in the circumferential direction, and correspondingly, six tenons may be provided in the circumferential direction. In other words, the number of tenons and tenons in the circumferential direction may be set as required, as long as the sub-tube 110 and the mother tube 130 can be stably assembled.

[0046] When the sub-tube 110 is inserted into the mother tube 130, the third fixed tube 135 cooperates with the first section 115, and the second fixed tube 131 cooperates with the second section 117. Specifically, when the sub-tube 110 is plugged into the mother tube 130, the fixed tenon 114 provided on the first section 115 and the rotating tenon 112 provided on the first rotating tube 113 sequentially pass through the avoidance tenon groove 132 of the mother tube 130, and then the fixed tenon 114 on the first section 115 and the fixed tenon groove 140 in the third fixed tube 135 cooperate with each other, the rotating tenon 112 and the rotating tenon groove 134 in the second rotating tube 133 cooperate with each other, and the fixed tenon 114 on the second section 117 and the avoidance tenon groove 132 cooperate with each other. After the plug-in fit between the sub-tube 110 and the mother tube 130 is completed, the rotating tenon 112 and the rotating tenon groove 134 are relatively fixed, and the second rotating tube 133 of the mother tube 130 is rotated from the outside, and the first rotating tube 113 on the inner sub-tube 110 rotates synchronously therewith. After rotating by a preset angle, the rotating tenon 112 on the first rotating tube 113 and the avoiding tenon groove 132 of the second fixed tube 131 are mutually staggered in the axial direction, and the rotating tenon 112 cannot pass through the avoiding tenon groove 132, that is, the first rotating tube 113 is stopped by the second fixed tube 131, so that the sub-tube 110 will not fall off from the mother tube 130, thereby realizing the stable assembly of the hydraulic pipe joint 100. In this embodiment, since the angle between adjacent tenons in the circumferential direction is 45°, the above-mentioned preset angle is less than 45°, so that the rotating tenon 112 and the avoiding tenon groove 132 can be mutually staggered in the axial direction after the second rotating tube 133 rotates by the preset angle.

[0047] Meanwhile, the first seal 120 is used for sealing between the first section 115 and the third fixed tube 135, and the second seal 122 is used for sealing between the fixed seat 121 and the second fixed tube 131. Specifically, the first seal 120 at the head of the sub-tube 110 abuts against the inner wall end face of the third fixed tube 135, and the second seal 122 on the fixed seat 121 at the root of the sub-tube 110 abuts against the end of the second fixed tube 131 of the mother tube 130, thereby achieving sealing between the sub-tube 110 and the mother tube 130, and effectively preventing high-pressure hydraulic oil from leaking from between the sub-tube 110 and the mother tube 130.

[0048] In other embodiments, the mother tube 130 may not include the third fixed tube 135, but only include the second rotating tube 133 and the second fixed tube 131, so that the second rotating tube 133 is used to connect the hydraulic tube. In other embodiments, the third fixed tube 135 may not be provided with the fixing groove 140, and it is only necessary that the sub-tube 110 can be stably assembled with the mother tube 130.

[0049] In addition, to facilitate user operation, the outer wall of the second rotating tube 133 is provided with an anti-slip groove 137, which extends axially. Multiple anti-slip grooves 137 are evenly spaced along the circumferential direction. The anti-slip grooves 137 increase the contact friction on the one hand, and on the other hand can assist the user in judging the rotation angle, making the installation connection more efficient.

[0050] The working principle and working process of the hydraulic pipe joint 100 are as follows:

[0051] When the sub-tube 110 is inserted into the mother tube 130, the fixed tenon 114 arranged on the first section 115 and the rotating tenon 112 arranged on the first rotating tube 113 pass through the avoidance tenon groove 132 of the mother tube 130 in sequence, and then the fixed tenon 114 on the first section 115 and the fixed tenon groove 140 in the third fixed tube 135 cooperate with each other, the rotating tenon 112 and the rotating tenon groove 134 in the second rotating tube 133 cooperate with each other, and the fixed tenon 114 on the second section 117 and the avoidance tenon groove 132 cooperate with each other. Then, the rotating tenon 112 and the rotating tenon groove 134 are relatively fixed, and the second rotating tube 133 of the mother tube 130 is rotated from the outside, and the first rotating tube 113 on the internal child tube 110 rotates synchronously therewith. After rotating by a preset angle (for example, 22.5°), the rotating tenon 112 on the first rotating tube 113 and the avoiding tenon groove 132 of the second fixed tube 131 are axially staggered with each other, and the rotating tenon 112 cannot pass through the avoiding tenon groove 132, that is, the first rotating tube 113 is stopped by the second fixed tube 131, so that the child tube 110 will not fall off from the mother tube 130, thereby realizing the stable assembly of the hydraulic pipe joint 100 and realizing the connection of the two hydraulic pipes.

[0052] In summary, the hydraulic pipe joint 100 can achieve stable assembly between the sub-tube 110 and the mother tube 130 with the help of the mortise and tenon structure of the sub-tube 110 and the mother tube 130, and drive the first rotating tube 113 on the sub-tube 110 to rotate by rotating the second rotating tube 133 on the mother tube 130, so that the rotating tenon 112 cannot pass through the avoidance tenon groove 132, thereby realizing self-locking of the hydraulic pipe joint 100, and the operation is simple during installation and connection, and the installation is more convenient.

[0053] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A hydraulic pipe joint, characterized in that: Including daughter tube and mother tube; The sub-tube includes a first fixed tube and a first rotating tube rotatably connected to the first fixed tube, the first rotating tube is provided with a rotating tenon; the first rotating tube is sleeved on the first fixed tube, a portion of the first fixed tube not covered by the first rotating tube is provided with a fixed tenon, and the rotating tenon and the fixed tenon can correspond to each other in the axial direction; The mother tube comprises a second fixed tube and a second rotating tube rotatably connected to one end of the second fixed tube, the end of the second fixed tube away from the second rotating tube is used for the insertion of the sub-tube; the second fixed tube is provided with an avoidance tenon groove; the second rotating tube is provided with a rotating tenon groove, the avoidance tenon groove and the rotating tenon groove can correspond to each other in the axial direction; the fixed tenon is used to cooperate with the avoidance tenon groove; When the child tube is inserted into the mother tube, the rotating tenon passes through the avoidance tenon groove and cooperates with the rotating tenon groove, so that the first rotating tube and the second rotating tube are relatively fixed, and then the second rotating tube can drive the first rotating tube to rotate a preset angle, so that the rotating tenon is staggered with the avoidance tenon groove in the axial direction, thereby preventing the child tube from separating from the mother tube.

2. The hydraulic pipe joint according to claim 1, characterized in that: The portion of the first fixed tube that is not covered by the first rotating tube includes a first section and a second section, the first section and the second section are respectively located at opposite ends of the first rotating tube, an end of the first section away from the first rotating tube is used for inserting the mother tube, and the first section and the second section are respectively provided with the fixing tenons.

3. The hydraulic pipe joint according to claim 2, characterized in that: A guiding slope is provided at one end of the fixing tenon disposed in the first section away from the first rotating tube, and the guiding slope is used to guide the fixing tenon to be inserted into the avoiding tenon groove.

4. The hydraulic pipe joint according to claim 2, characterized in that: The mother tube includes a third fixed tube, one end of the second rotating tube is rotatably connected to the second fixed tube, and the other end is rotatably connected to the third fixed tube. When the child tube is inserted into the mother tube, the third fixed tube cooperates with the first section, and the second fixed tube cooperates with the second section.

5. The hydraulic pipe joint according to claim 4, characterized in that: The third fixing tube is provided with a fixing tenon groove, and the fixing tenon groove is used to cooperate with the fixing tenon head provided in the first section.

6. The hydraulic pipe joint according to claim 4, characterized in that: A first sealing member is disposed at one end of the first section away from the first rotating tube, and the first sealing member is used for sealing between the first section and the third fixed tube.

7. The hydraulic pipe joint according to claim 4, characterized in that: The first fixed tube includes a fixed seat, which is arranged at an end of the second section away from the first rotating tube. The fixed seat is provided with a second sealing member, which is used for sealing between the fixed seat and the second fixed tube.

8. The hydraulic pipe joint according to claim 4, characterized in that: The second rotating tube and the second fixed tube, as well as the second rotating tube and the third fixed tube are connected via bearings.

9. The hydraulic pipe joint according to claim 1, characterized in that: The first rotating tube is provided with a plurality of rotating tenons at intervals in the circumferential direction, the second rotating tube is provided with a plurality of rotating tenon grooves, the second fixed tube is provided with a plurality of avoiding tenon grooves, the plurality of rotating tenons and the plurality of rotating tenon grooves correspond one to one, and the plurality of avoiding tenon grooves and the plurality of rotating tenon grooves correspond one to one.

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