Anti-disconnection interface for dragging pipe

Abstract

The application discloses a kind of anti-disengagement interfaces of pipe material dragging, including socket, socket, convex piece, retainer ring, connecting piece, fastener and elastic piece, socket inner wall is sequentially provided with first recess, second recess and blocking portion from end face to the direction of away from socket end face, convex piece is fixedly installed in socket outer wall, retainer ring is movably sleeved in socket, connecting piece is detachably connected in the end face of socket by fastener, retainer ring is confined between connecting piece and second recess, convex piece is confined between retainer ring and blocking portion, connecting piece, retainer ring, convex piece can be sequentially contacted and transmit force, elastic piece with elasticity is provided between the outer wall of retainer ring and socket inner wall, pre-pressing, socket and socket are coaxial, connecting piece does not contact the outer wall of socket.The application can realize the sequential dragging of pipe material, the needed component is simple, installation is simple, overall cost is lower, interface strength is high, and two adjacent pipes are allowed to occur relative deflection.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of pipe materials, and particularly relates to a drag pipe material anti-disconnection interface. BACKGROUND

[0002] The drag pipe technology is a non-excavation underground pipeline laying method, and its core process includes the following steps: a guide drill bit is used to drill a hole according to a designed track, a hole expander is used to expand the hole diameter step by step, and finally a pipe material is connected to the tail of the hole expander and dragged into the hole, the pipe materials are connected in sequence, and the rear pipe material is dragged into the hole by the front pipe material. If two adjacent pipe materials in the hole are disconnected during the dragging process, the pipe material that has been dragged into the hole needs to be removed to reconnect the pipe materials, which greatly increases the construction cost and reduces the construction efficiency. Therefore, the strength of the connection interface between the adjacent pipe materials needs to be ensured to be large enough to minimize the probability of disconnection of the two adjacent pipes. In addition, the process of connecting the two adjacent pipes is carried out and completed at the construction site, and the technical level and equipment of the personnel at the construction site are limited, so the method for connecting the two adjacent pipes should not be too complex. Finally, the procurement cost and construction cost of the connection interface components should be as low as possible. SUMMARY

[0003] In view of the above problems existing in the prior art, the present application aims to provide a drag pipe material anti-disconnection interface, which can realize the sequential dragging of the pipe materials, and the components required by the anti-disconnection interface are simple, the installation is simple, the overall cost is low, the interface strength is high, and the probability of rework due to disconnection of the interface during the construction process is greatly reduced, and the relative deflection of the two adjacent pipe materials is allowed.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present application is as follows:

[0005] A pipe material anti-disconnection interface, comprising a spigot and a socket, the spigot being inserted into the socket, an inner wall of the socket being provided with a first groove, a second groove and a blocking portion in sequence from an end face towards a direction away from the end face of the socket, the anti-disconnection interface further comprising a protruding piece, a retainer ring, a connecting piece, a fastener and an elastic piece, the protruding piece being fixedly installed on an outer wall of an insertion socket portion of the spigot, the retainer ring being an annular structure with an inner diameter not less than an outer diameter of the spigot, the retainer ring being movably sleeved on the spigot, the connecting piece being detachably connected to the end face of the socket through the fastener, the retainer ring being limited in the first groove between the connecting piece and the second groove, the protruding piece being limited between the retainer ring and the blocking portion, the connecting piece, the retainer ring and the protruding piece being capable of contacting and transmitting force in sequence, the elastic piece being provided between an outer wall of the retainer ring and the inner wall of the socket and being pre-pressed, the spigot and the socket being coaxial, and the connecting piece not contacting the outer wall of the spigot.

[0006] As a further improvement of the above technical solution:

[0007] The inner diameter of the socket at the first groove, the outer diameter of the retainer ring, the inner diameter of the socket at the second groove, the outer diameter of the protruding member, the inner diameter of the socket at the blocking portion, and the outer diameter of the spigot are sequentially reduced.

[0008] The size of the retainer ring in the axial direction of the socket is not greater than the size of the first groove in the axial direction of the socket, and the size of the protruding member in the axial direction of the socket is less than the size of the second groove in the axial direction of the socket.

[0009] The connecting piece comprises at least two first half flange pieces and at least two second half flange pieces, each first half flange piece is sequentially spliced and covers the end face of the socket and exceeds the inner wall of the socket, and the second half flange piece is used for covering the splicing portion of the adjacent two first half flange pieces.

[0010] The first half flange piece and the second half flange piece do not exceed the outer wall of the socket.

[0011] The anti-disengagement interface further comprises a sealing ring for sealing the anti-disengagement interface.

[0012] The elastic member is a rubber ring.

[0013] The fastener is a bolt.

[0014] The inner wall of the socket is further provided with a sealing groove and a third groove, the first groove, the second groove, the blocking portion, the sealing groove and the third groove are sequentially arranged along the axial direction of the socket, the inner diameter of the socket at the sealing groove, the inner diameter of the socket at the third groove and the inner diameter of the spigot are sequentially reduced, and the inner diameter of the socket at the third groove is greater than or equal to the inner diameter at the blocking portion.

[0015] The adjacent two pipes can be relatively deflected, when the maximum deflection angle is α, the size B of the second groove in the direction parallel to the central axis of the pipe, half H of the difference between the inner diameter of the socket at the second groove and the outer diameter of the spigot, half H1 of the difference between the inner diameter of the socket at the first groove and the outer diameter of the spigot, and half h1 of the difference between the outer diameter and the inner diameter of the retainer ring satisfy the following conditions:

[0016] ;

[0017] ;

[0018] ;

[0019] ;

[0020] Wherein, the meanings of the symbols are as follows:

[0021] DE is the outer diameter of the socket, h is half of the difference between the outer diameter and the inner diameter of the protruding piece, b is the width of the protruding piece, i.e. the dimension of the protruding piece in the direction parallel to the central axis of the pipe; t2 is the axial distance between the junction of the sealing groove and the third groove and the bottom of the fastening hole; L0 is the length of the fastening hole, i.e. the dimension of the fastening hole in the direction parallel to the central axis of the pipe, the fastening hole being a blind hole for mounting the fastener; b1 is the dimension of the retainer ring in the direction parallel to the central axis of the retainer ring, b1 > b; d1 is the inner diameter of the socket at the blocking portion; d2 is the minimum inner diameter of the socket at the third groove; h7 is half of the difference between the outer diameter and the inner diameter of the elastic piece in the natural state without external force.

[0022] The beneficial effects of the present application are:

[0023] (1) The connecting piece, the retainer ring and the protruding piece can sequentially contact and transmit force, realizing sequential pulling of the pipes.

[0024] (2) The double-ring arrangement of the retainer ring and the protruding piece in combination with the connecting piece improves the strength of the interface, and the retainer ring and the protruding piece are movably and fixedly sleeved outside the socket, respectively, improving the flexibility of the pipe installation and construction process. The end surface area of the retainer ring is larger than that of the protruding piece, so that the area of contact between the first half flange piece and the retainer ring is larger than that between the first half flange piece and the protruding piece, and under the same pushing force of the first half flange piece, the retainer ring receives smaller pressure, which helps to improve the use reliability of the anti-disengagement interface. In addition, the outer diameter of the protruding piece is smaller than that of the retainer ring, which means that the protruding piece contacts only a part of the end surface of the retainer ring close to the central axis, which is equivalent to counterweighting the part of the retainer ring close to the central axis. When the adjacent two pipes are relatively deflected, the above arrangement of the protruding piece makes the retainer ring need a larger torque to rotate, thereby making the retainer ring more stable and less likely to disengage from the set position.

[0025] (3) When two adjacent pipes are connected, only the sealing ring, the elastic piece and the retainer ring need to be sleeved, and finally the connecting piece is fixedly connected to the end surface of the socket through the fastener, so that the anti-disengagement interface is formed. The installation of the interface is simple, and the technical level of the installation equipment and personnel is relatively low, which is suitable for installation at the construction site.

[0026] (4) The gap between the connecting piece and the outer wall of the socket, the elastic piece, the movable sleeving of the retainer ring, and the width of the second groove being larger than the width of the protruding piece allow the relative deflection of the two adjacent pipes, so that the interface adapts to the deflection caused by external factors during the installation and use of the pipes.

[0027] (5) The anti-disengagement interface needs simple components and is easy to install, has a relatively low overall cost, high interface strength, and greatly reduces the probability of rework caused by disengagement of the interface during the construction process.

[0028] (6) When the fastener is inserted into the socket, the fastening hole is a screw hole, which is very suitable for the material of steel pipe, and the form of the screw thread is relatively stable. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a schematic diagram of a pipe structure of an embodiment of the present application.

[0030] Figure 2 is a schematic diagram of an anti-disengagement interface structure of an embodiment of the present application.

[0031] Figure 3 is another perspective view of Figure 2

[0032] Figure 4 is a schematic diagram of the socket and the socket of the anti-disengagement interface of an embodiment of the present application when they are relatively deflected.

[0033] Figure 5 is a schematic diagram of the size of the socket end of an embodiment of the present application.

[0034] Figure 6 is an enlarged schematic diagram of F1 of Figure 4

[0035] Figure 7 is an enlarged schematic diagram of F2 of Figure 4

[0036] Figure 8 is an enlarged schematic diagram of F3 of Figure 4

[0037] Reference signs: 1, socket, 2, socket, 21, first groove, 22, second groove, 23, blocking part, 24, sealing groove, 25, fastening hole, 26, third groove, 3, protruding piece, 4, stop ring, 51, first half flange piece, 52, second half flange piece, 6, fastener, 7, elastic piece, 8, sealing ring, 9, gasket, 10, pipe body. DETAILED DESCRIPTION

[0038] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present application, and are not intended to limit the present application.

[0039] ​​​​For purposes of the description hereinafter, spatially relative terms, such as "above", "below", "up", "down", "between", "within", "left", "right", "rear", "front", "upper", "lower", "horizontal", "vertical", "above", "below", "top", "bottom", "under", and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if a device in the figures is inverted, elements described as "above" or "up" other elements or features would then be oriented "below" or "down" the other elements or features. Thus, the exemplary term "above" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. It will also be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation, and therefore, the exemplary terms "above", "below", "up", and "down", encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0040] A pipe anti-disconnection interface for pulling a pipe, such as a socket pipe, the pipe comprising, in sequence, a spigot 1, a pipe body 10 and a socket 2. Figure 1 As shown in the figure, the pipe comprises, in sequence, a spigot 1, a pipe body 10 and a socket 2. A protruding member 3 is fixedly sleeved on the outer wall of the spigot 1, and protrudes from the outer surface of the spigot 1. The outer diameter of the spigot 1 is equal to the outer diameter of the pipe body 10.

[0041] In this embodiment, the protruding member 3 is in the form of a ring made of metal, and is fixedly welded on the outer wall of the spigot 1.

[0042] The inner wall of the socket 2 is provided, in sequence from the end surface, with a first groove 21, a second groove 22, a blocking portion 23, a sealing groove 24 and a third groove 26 towards the pipe body 10. The first groove 21, the second groove 22, the sealing groove 24 and the third groove 26 are all grooves provided on the inner wall of the socket 2, i.e. are formed by being concave inwards from the inner wall of the socket 2, and the blocking portion 23 is a portion that is not concave inwards. Each of the grooves is a groove along one turn of the circumference of the inner wall of the socket 2. The inner diameter of the socket 2 at the first groove 21, the inner diameter of the socket 2 at the second groove 22 and the inner diameter of the socket 2 at the blocking portion 23 are sequentially reduced, the inner diameter of the socket 2 at the sealing groove 24, the inner diameter of the socket 2 at the third groove 26 and the inner diameter of the pipe body 10 are sequentially reduced, and the inner diameter of the socket 2 at the third groove 26 is greater than or equal to the inner diameter of the socket 2 at the blocking portion 23. The sealing groove 24 is used for installing a sealing ring 8 to achieve sealing when two adjacent pipes are connected. The shape of the inner wall of the portion of the socket 2 between the blocking portion 23 and the pipe body 10 can adopt the shape in the prior art, for example, be designed according to the requirements of the existing group and industry standards. The inner diameters of the socket 2 at different positions of the third groove 26 can not be completely equal. Specifically, from the end surface of the socket 2 towards the direction away from the end surface of the socket 2, the inner diameters of the socket 2 at different positions of the third groove 26 gradually increase.

[0043] The socket 2 is further provided with a plurality of fastening holes 25 which are blind holes formed in the end surface of the socket 2, and the plurality of fastening holes 25 are arranged along the circumference of the socket 2.

[0044] When the two pipes are connected, the spigot 1 of one pipe is inserted into the socket 2 of the other pipe.

[0045] The anti-disengagement interface is shown in Figure 2 and 3 The anti-disengagement interface is shown in

[0046] The first groove 21 and the second groove 22 are respectively arranged to not interfere with the anti-disengagement ring 4 and the protruding piece 3. The anti-disengagement ring 4 is substantially located in the first groove 21, and the protruding piece 3 is substantially located in the second groove 22. The protruding piece 3 enters the socket 2 together with the spigot 1, the anti-disengagement ring 4 movably sleeves the spigot 1, and the anti-disengagement ring 4 is located on the side of the protruding piece 3 away from the end surface of the spigot 1. The inner diameter of the anti-disengagement ring 4 is slightly greater than or equal to the outer diameter of the spigot 1, the outer diameter of the anti-disengagement ring 4 is greater than the outer diameter of the protruding piece 3, and the inner diameter of the anti-disengagement ring 4 is less than the outer diameter of the protruding piece 3. The inner diameter of the socket 2 at the first groove 21, the outer diameter of the anti-disengagement ring 4, the inner diameter of the socket 2 at the second groove 22, the outer diameter of the protruding piece 3, the inner diameter of the socket 2 at the blocking portion 23, and the outer diameter of the spigot 1 gradually decrease. When the spigot 1 and the socket 2 are coaxial, the width of the anti-disengagement ring 4 is not greater than the width of the first groove 21, and the width of the protruding piece 3 is less than the width of the second groove 22. The above-mentioned “width” refers to the size of the corresponding component in the axial direction of the socket 2.

[0047] In this embodiment, the anti-disengagement ring 4 is also a ring-shaped structure made of metal material.

[0048] The connecting piece is detachably connected to the end surface of the socket 2 through the fastening piece 6, and the fastening piece 6 is provided with a plurality of fastening pieces. The connecting piece includes at least two first half-flange pieces 51 and at least two second half-flange pieces 52. Each first half-flange piece 51 can be sequentially spliced into a circular ring shape and covered on the end surface of the socket 2. The outer circumference of the circular ring shape is flush with the outer wall of the socket 2, and the inner circumference of the circular ring shape exceeds the inner wall of the socket 2, that is, the outer diameter of the circular ring shape is equal to the outer diameter of the socket 2, and the inner diameter of the circular ring shape is less than the inner diameter of the socket 2 at the first groove 21 and less than the outer diameter of the anti-disengagement ring 4. The second half-flange piece 52 is used to cover the splicing portion of the adjacent two first half-flange pieces 51 to enhance the connection strength of the connecting piece as a whole. Therefore, the second half-flange piece 52 does not need to cover all the first half-flange pieces 51, but only needs to cover the splicing portion of the adjacent two first half-flange pieces 51.

[0049] In the embodiment, each second half flange piece 52 is located on the same circular ring, the outer diameter of the circular ring is equal to the outer diameter of the circular ring formed by splicing each first half flange piece 51, and the inner diameter of the circular ring is greater than the inner diameter of the circular ring formed by splicing each first half flange piece 51.

[0050] For the stacking position of the second half flange piece 52 and the first half flange piece 51, the fastener 6 is inserted into the fastening hole 25 after sequentially penetrating the second half flange piece 52 and the first half flange piece 51; for the position only with the first half flange piece 51, the fastener 6 is inserted into the fastening hole 25 after penetrating the first half flange piece 51.

[0051] In the embodiment, two first half flange pieces 51 and two second half flange pieces 52 are provided.

[0052] In the embodiment, the fastener 6 is a bolt, and a gasket 9 is provided between the head end of the bolt and the second half flange piece 52 or the first half flange piece 51 in contact with the second half flange piece 52 or the first half flange piece 51.

[0053] In the embodiment, each anti-disengagement interface is provided with 12 fasteners 6.

[0054] The connecting piece, the retainer ring 4, and the protruding piece 3 can sequentially contact and transmit the force. Specifically, the second half flange piece 52, the first half flange piece 51, the retainer ring 4, and the protruding piece 3 sequentially contact, and a pre-pressed elastic piece 7 with elasticity is provided between the outer wall of the retainer ring 4 and the inner wall of the socket 2 at the first recess 21. When the socket 1 and the socket 2 are coaxial, neither the second half flange piece 52 nor the first half flange piece 51 contacts the outer wall of the socket 1.

[0055] In the embodiment, the elastic piece 7 is a rubber ring.

[0056] The sealing ring 8 is located in the sealing groove 24 and is pressed between the socket 1 and the socket 2.

[0057] Based on the above structure, when the pipe is pulled to the right in the middle, Figure 2 the connecting piece, the retainer ring 4, and the protruding piece 3 sequentially apply a pushing force, when the pipe is pulled to the left in the middle, Figure 2 the protruding piece 3, the retainer ring 4, and the connecting piece sequentially apply a pushing force.

[0058] Due to the design of the anti-disengagement interface, the relative deflection of the two adjacent pipes is allowed. Specifically, the gap between the second half flange piece 52 and the first half flange piece 51 and the socket 1, the elastic piece 7, and the space not occupied by the protruding piece 3 in the second recess 22 allow the relative deflection of the two adjacent pipes, and flexibly adapt to the deflection of the pipe caused by external factors during the pulling process or after installation.

[0059] As shown by the dashed line in the figure, Figure 4 when the socket 1 rotates clockwise relative to the socket 2, Figure 4The protrusion 3 in the upper middle part approaches or directly contacts the side wall at the transition between the second groove 22 and the blocking part 23, and the anti-reverse ring 4 squeezes the elastic member 7, causing separation between the protrusion 3 and the anti-reverse ring 4. Figure 4 The protrusion 3 in the lower half of the connector presses tightly against the anti-reverse ring 4. Because there is a gap between the anti-reverse ring 4 and the outer wall of the socket 1, relative movement and a certain degree of relative rotation can occur between the anti-reverse ring 4 and the socket 1 during this process to accommodate the deflection of the socket 1. Simultaneously, the anti-reverse ring 4 is confined within the first groove 21, ensuring the stability of the entire interface and preventing it from disengaging. The same principle applies when the socket 1 rotates counterclockwise relative to the socket 2.

[0060] When connecting adjacent pipes, i.e., installing the interface, firstly, a sealing ring 8 is installed in the sealing groove 24 of the first pipe, and an elastic element 7 is installed in the first groove 21. A retaining ring 4 is then fitted over the spigot 1 of the second pipe. The retaining ring 4 is located on the side of the protrusion 3 away from the end face of the spigot 1. To achieve the installation of the retaining ring 4, two or more arc-shaped structures that can be spliced ​​into a ring are used, fitted over the spigot 1, and then the arc-shaped structures are welded together. Then, the spigot 1 of the second pipe is inserted into the socket 2 of the first pipe, so that both the retaining ring 4 and the protrusion 3 enter the socket 2. Obviously, due to the size design of each component, when the spigot 1 is inserted into the socket 2, the protrusion 3 cannot continue inward after contacting the side wall between the second groove 22 and the blocking part 23, and the retaining ring 4 is also blocked by the side wall between the first groove 21 and the second groove 22. Finally, the first half-flange 51 and the second half-flange 52 are installed using fasteners 6 to complete the installation of the anti-detachment interface.

[0061] The deflection angle is the angle at which two adjacent pipes deflect relative to each other. When the deflection angle between the two adjacent pipes is at its maximum value, after deflection, both the first half flange 51 and the second half flange 52 of the anti-detachment interface contact the pipe body 10, and the spigot 1 contacts the socket 2 on the inner wall corresponding to the third groove 26. Specifically, in Figure 4 In the cross-section shown, when the pipe containing spigot 1 is deflected clockwise relative to the pipe containing socket 2 to the maximum deflection angle α, as... Figure 6 As shown, after deflection, the end of the inner wall of the second half flange 52 furthest from the first half flange 51 contacts the pipe body 10 at point O1; the end of the inner wall of the first half flange 51 closest to the second half flange 52 contacts the pipe body 10 at point O2; and the contact point between the inner wall of the second half flange 52 and the first half flange 51 is point O3. Clearly, points O1, O2, and O3 are located at the three vertices of a right triangle, and... ,in, L 23 The distance between points O2 and O3 L 13The distance between the point O1 and the point O3, i.e. the thickness of the second half flange 52 or the dimension parallel to the axial direction of the pipe. The socket 1 contacts the inner wall of the third groove 26 at the position of the minimum inner diameter of the socket 2.

[0062] For the convenience of description, it is assumed that the central axes of the two adjacent pipes coincide before deflection, and the first half flange 51, the retainer ring 4 and the protruding member 3 contact each other in sequence. After deflection, the central axes of the two adjacent pipes intersect, as shown in Figure 4 In order to make the maximum deflection angle of the two adjacent pipes reach α, the dimension B of the second groove 22 in the direction parallel to the central axis of the pipe, the dimension H of the second groove 22 in the direction parallel to the radial direction of the pipe (i.e. half of the difference between the inner diameter of the socket 2 at the second groove 22 and the inner diameter of the socket 2 at the blocking portion 23), the thickness h1 of the retainer ring 4 (i.e. half of the difference between the outer diameter and the inner diameter of the retainer ring 4), and the distance H1 between the first groove 21 and the socket 1 (i.e. half of the difference between the inner diameter of the socket 2 at the first groove 21 and the outer diameter of the socket 1) satisfy the following conditions:

[0063] (1);

[0064] (2);

[0065] (3);

[0066] (4);

[0067] As shown in Figure 7 , B0 is the maximum axial distance from the end of the protruding member 3 near the retainer ring 4 before deflection to the end of the protruding member 3 away from the retainer ring 4 after deflection, and the axial direction refers to the axial direction of the protruding member 3 or the axial direction of the socket 2. H0 is the maximum radial distance between the outer wall of the socket 1 before deflection and the outer wall of the protruding member 3 after deflection, and the radial direction refers to the radial direction of the protruding member 3 or the radial direction of the socket 1. d1 is the inner diameter of the socket 2 at the blocking portion 23. DE is the outer diameter of the socket 1. h0 is the maximum radial distance between the inner wall of the second groove 22 of the socket 2 and the inner wall of the retainer ring 4 after deflection, and the radial direction refers to the radial direction of the protruding member 3 or the radial direction of the socket 1. h7 is the natural thickness of the elastic member 7, i.e. half of the difference between the outer diameter and the inner diameter of the elastic member 7 in the natural state without external force.

[0068] The inequality (1) shows that the size of the second groove 22 in the direction parallel to the axial direction of the pipe is sufficient to meet the displacement of the protruding member 3 in the axial direction of the socket 2. The inequality (2) shows that the size of the second groove 22 in the direction parallel to the radial direction of the pipe (half of the difference between the inner diameter of the socket 2 at the second groove 22 and the inner diameter of the socket 2 at the blocking portion 23) is sufficient to meet the displacement of the protruding member 3 in the radial direction of the socket 2. The inequality (3) shows that the thickness of the retainer ring 4 (half of the difference between the outer diameter and the inner diameter of the retainer ring 4) meets the deflection requirement so that the retainer ring 4 does not come out from the connection between the first groove 21 and the second groove 22 after being deflected. The inequality (4) shows that the distance between the inner wall of the first groove 21 and the outer wall of the spigot 1 (half of the difference between the inner diameter of the socket 2 at the first groove 21 and the outer diameter of the spigot 1) is not less than the sum of the thickness of the retainer ring 4 and the natural thickness of the elastic member 7, which ensures that the elastic member 7 has sufficient compression space when deflected.

[0069] Based on the above inequalities (1) to (4) and the geometric relationship before and after the pipe is deflected, the following relationships are obtained:

[0070] (5);

[0071] (6);

[0072] (7);

[0073] (8);

[0074] wherein the symbols are defined as follows:

[0075] h is half of the difference between the outer diameter and the inner diameter of the protruding member 3, b is the width of the protruding member 3, i.e. the size of the protruding member 3 in the direction parallel to the central axis of the pipe; t2 is the axial (parallel to the central axis of the pipe) distance between the connection of the sealing groove 24 and the third groove 26 and the bottom of the fastening hole 25; L0 is the length of the fastening hole 25, i.e. the size of the fastening hole 25 in the direction parallel to the central axis of the pipe; b1 is the size of the retainer ring 4 in the direction parallel to the central axis of the retainer ring 4, b1 > b; d2 is the minimum inner diameter of the socket 2 at the third groove 26.

[0076] It should be noted that the above relationships do not limit the specific values of the parameters, and the specific values of the parameters can be selected and calculated according to the use occasion, but they need to meet the above relationships. For example, the outer diameter of the spigot 1 is selected according to the required specification, and the width b of the protruding member 3 is calculated by allowing the pulling force and the allowable stress of the pipe.

[0077] Finally, it is necessary to explain here that: the above examples are only used to make further detailed description of the technical solutions of the present application, and cannot be understood as a limitation on the protection scope of the present application. Some non-essential improvements and adjustments made by the skilled in the art based on the above content of the present application all belong to the protection scope of the present application.

Claims

1. A non-detachment interface for a drag pipe, comprising a spigot (1) and a socket (2), wherein the spigot (1) is inserted into the socket (2), characterized in that, The inner wall of the socket (2) is provided with a first groove (21), a second groove (22), a blocking part (23), a sealing groove (24), and a third groove (26) in sequence from the end face away from the end face of the socket (2). The anti-detachment interface also includes a protrusion (3), a backstop ring (4), a connector, a fastener (6), and an elastic element (7). The protrusion (3) is fixedly installed on the outer wall of the insertion part of the socket (1) into the socket (2). The backstop ring (4) is an annular structure with an inner diameter not less than the outer diameter of the socket (1). The backstop ring (4) is movably sleeved on the socket (1). In addition, the connector is detachably connected to the end face of the socket (2) by fastener (6), the anti-reverse ring (4) is limited in the first groove (21) between the connector and the second groove (22), and the protrusion (3) is limited between the anti-reverse ring (4) and the blocking part (23). The connector, the anti-reverse ring (4) and the protrusion (3) can contact and transmit force in sequence. An elastic pre-compression elastic element (7) with elasticity is provided between the outer wall of the anti-reverse ring (4) and the inner wall of the socket (2). When the socket (1) and the socket (2) are coaxial, the connector does not contact the outer wall of the socket (1). Two adjacent pipes can deflect relative to each other. When the maximum deflection angle is α, the dimensions B of the second groove (22) in the direction parallel to the central axis of the pipe, half the difference H between the inner diameter of the socket (2) at the second groove (22) and the outer diameter of the spigot (1), half the difference H1 between the inner diameter of the socket (2) at the first groove (21) and the outer diameter of the spigot (1), and half the difference h1 between the outer diameter and the inner diameter of the anti-reverse ring (4) satisfy the following conditions: ； ； ； ； The meanings of each symbol are as follows: DE is the outer diameter of the socket (1), h is half the difference between the outer diameter and inner diameter of the protrusion (3), b is the width of the protrusion (3), that is, the size of the protrusion (3) in the direction parallel to the central axis of the pipe; t2 is the axial distance between the connection of the sealing groove (24) and the third groove (26) and the bottom of the fastening hole (25); L0 is the length of the fastening hole (25), that is, the size of the fastening hole (25) in the direction parallel to the central axis of the pipe, and the fastening hole (25) is a blind hole for installing fasteners (6); b1 is the size of the anti-return ring (4) in the direction parallel to the central axis of the anti-return ring (4), b1 > b; d1 is the inner diameter of the socket (2) at the blocking part (23); d2 is the minimum inner diameter of the socket (2) at the third groove (26); h7 is half the difference between the outer diameter and inner diameter of the elastic element (7) in its natural state without external force, and the sealing ring (8) is installed in the sealing groove (24).

2. The anti-detachment interface according to claim 1, characterized in that: The inner diameter of the socket (2) at the first groove (21), the outer diameter of the anti-reverse ring (4), the inner diameter of the socket (2) at the second groove (22), the outer diameter of the protrusion (3), the inner diameter of the socket (2) at the blocking part (23), and the outer diameter of the insertion (1) decrease in sequence.

3. The anti-detachment interface according to claim 1 or 2, characterized in that: The dimension of the anti-reverse ring (4) in the axial direction of the socket (2) is not greater than the dimension of the first groove (21) in the axial direction of the socket (2), and the dimension of the protrusion (3) in the axial direction of the socket (2) is smaller than the dimension of the second groove (22) in the axial direction of the socket (2).

4. The anti-detachment interface according to claim 1, characterized in that: The connector includes at least two arc-shaped first half flanges (51) and at least two arc-shaped second half flanges (52). Each first half flange (51) is spliced ​​together in sequence, covering the end face of the socket (2) and extending beyond the inner wall of the socket (2). The second half flange (52) is used to cover the splice of two adjacent first half flanges (51).

5. The anti-detachment interface according to claim 4, characterized in that: The first half flange (51) and the second half flange (52) do not extend beyond the outer wall of the socket (2).

6. The anti-detachment interface according to claim 1, characterized in that: The elastic element (7) is a rubber ring.

7. The anti-detachment interface according to claim 1, characterized in that: Fastener (6) is a bolt.

8. The anti-detachment interface according to claim 1 or 2, characterized in that: The inner diameter of the socket (2) at the sealing groove (24), the inner diameter at the third groove (26), and the inner diameter of the spigot (1) decrease in sequence. The inner diameter of the socket (2) at the third groove (26) is greater than or equal to the inner diameter at the blocking part (23).

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