CN115638297A - Steel pipe connector - Google Patents

Abstract

The invention discloses a steel pipe connector, which belongs to the technical field of pipe joints and comprises a fixed through head, wherein positioning ring grooves are symmetrically arranged at two ends of the fixed through head, a fixed plug sleeve is sleeved on the inner circumferential surface of each positioning ring groove, first external threads are symmetrically arranged on the outer circumferential surface of each positioning ring groove, a locking cap corresponds to each first external thread, a first internal thread matched with the first external thread is arranged on the inner circumferential surface of each locking cap, each locking cap is extruded on a sealing sleeve, and the sealing sleeves are arranged at two sides of the positioning ring grooves. The invention has no requirement on the design of the end opening of the steel pipe, can tightly and compactly connect the two steel pipes, and has high flexibility, good sealing performance and stable connection.

Description

A steel pipe connector

technical field

The invention relates to a steel pipe connector, which belongs to the technical field of pipe joints.

Background technique

Steel pipes are involved in all aspects of daily life. Steel pipes are often used as conveying pipes in the process of conveying various media such as water, gas, and oil. During installation, it is often necessary to connect two steel pipes to install or extend the conveying pipes. In the prior art, some One or both ends of the steel pipe are designed with flanges or threads. Only two specific pipes of this kind can be connected together. If the steel pipe needs to be cut off according to the length of the delivery pipeline, a new port will be formed. There is no matching method for the new port. If flange or thread is used, two steel pipes cannot be connected. In the case where the flange or thread is designed at the port of the steel pipe to promote the connection of two steel pipes, the steel pipe needs to be specified, with low flexibility and low adaptability. In addition, the tightness of this connection Relatively poor, some are two steel pipes connected by welding, the installation efficiency is low, and it is also prone to false welding or missing welding.

Contents of the invention

Aiming at the above-mentioned problems in the prior art, the present invention provides a steel pipe connector, which can make two steel pipes tightly connected without any requirements for the port design of the steel pipes, with high flexibility, good sealing performance and stable connection.

In order to achieve the above object, the present invention adopts the following technical solutions: a steel pipe connector, including a fixed through head, a symmetrically arranged tight sleeve, a symmetrically arranged fixed plug sleeve and two locking caps, the two fixed through head The end is symmetrically provided with positioning ring grooves, one positioning ring groove corresponds to a fixed plug sleeve, and the fixed plug sleeve is correspondingly sleeved on the inner peripheral surface of the positioning ring groove, and the outer peripheral surface of the positioning ring groove is symmetrically provided with first External threads, a first external thread corresponds to a locking cap, the inner peripheral surface of the locking cap is provided with a first internal thread matching the first external thread, a tight sleeve corresponds to a locking cap, and the tight sleeve is provided inside the locking cap.

Preferably, each of the locking caps includes a constant pressure sleeve and a locking cap, the end of the outer peripheral surface of the constant pressure sleeve close to the fixed through head is provided with a second external thread that cooperates with the first internal thread, and the constant pressure A concave guide slip groove is also provided on the outer peripheral surface of the sleeve, and a guide slip ring adapted to the guide slip groove is provided on the inner peripheral surface of the locking cap away from the fixed through head, and the first internal thread is arranged on the lock Close the inner peripheral surface of the cap.

Preferably, one end of the outer peripheral surface of one locking cap close to the fixed through head is provided with a concave terminal groove, the peripheral surface of the terminated groove is provided with a third external thread, and the other locked cap is close to the fixed through head. One end of the head is provided with a protruding terminal ring adapted to the terminal groove, and the inner peripheral surface of the terminal ring is provided with a second internal thread matched with the third external thread.

Preferably, the tight sleeve is provided with a radial constriction radially penetrating through the tight sleeve.

Preferably, the tight sleeve is arranged in a stepped structure, and it includes a first step, a second step, and a third step whose outer diameter increases sequentially from an end close to the fixed through head to an end far away from the fixed through head, so The inner peripheral surface of the fixed pressure sleeve is fitted with the first step and the second step, the outer diameter of the third step is larger than the inner diameter of the locking cap, and the inner peripheral surface of the third step is provided with a Arrangement of the first shrinkage tank.

Preferably, the outer diameter of the third step gradually increases from an end away from the fixed through head to an end close to the fixed through head.

Preferably, a trumpet-shaped push port is provided on the inner peripheral surface of the locking cap close to the end of the fixed through head, and the inner diameter of the push port gradually expands toward the direction away from the guide chute.

Preferably, an inserting sleeve is provided at one end of the tight sleeve close to the fixed through head, the inserting sleeve is in contact with the outer peripheral surface of the positioning ring groove, the radial closure extends through the inserting sleeve, and the inserting sleeve The radial closing opening on the top is equal to the radial closing opening on the first step and the second step and smaller than the radial closing opening on the third step, and the inner peripheral surface of the inserting sleeve is provided with a limit ring pad.

Preferably, both side walls of the limiting ring pad are provided with concave suction ring grooves.

Preferably, the outer diameter of the fixed plug sleeve gradually increases from the port of the positioning ring groove to the inside of the positioning ring groove.

Preferably, the outer peripheral surface of the fixed plug sleeve is provided with a second shrinkage groove arranged along the axis.

Beneficial effects of the present invention: the steel pipe connection head of the present invention is equipped with a fixed head, a tight sleeve, a fixed plug sleeve, and a locking cap, which has high flexibility and adaptability, and does not require any special screw thread, flange, etc. for the steel pipe. After processing, it is possible to fasten and connect ordinary steel pipes tightly, and it also effectively solves the problems of low welding efficiency, virtual welding or missing welding in existing welding; during construction, after cutting the steel pipes as required, the cut steel pipes can still pass through the joint It is fastened and densely connected to improve the utilization rate of the steel pipe; the fixed pressure sleeve and the locking cap that cooperate with each other are set, and while the tight sleeve is squeezed and locked, the quick connection between the locking cap and the fixed through head can be accelerated, and the two The working efficiency of the steel pipe connection; the steel pipe connection head of the present invention is tightly fitted with the steel pipe through the tight sleeve and the fixed plug sleeve, which will not loosen or even fall off for a long time. It is stable and has a good sealing effect, effectively preventing the leakage of the transported medium.

Description of drawings

Fig. 1 is a schematic diagram of the disassembled state structure of the steel pipe joint of the present invention.

Fig. 2 is a schematic diagram of the state structure of the assembly process of the steel pipe joint of the present invention.

Fig. 3 is a structural schematic diagram of the complete connection of two locking caps of the steel pipe connector of the present invention.

Fig. 4 is a schematic diagram of the structure of the fixed through head of the present invention.

Fig. 5 is a structural schematic diagram of a locking cap of the present invention.

FIG. 6 is an enlarged view at point A in FIG. 5 .

Fig. 7 is a structural schematic diagram of another locking cap of the present invention.

FIG. 8 is an enlarged view at B in FIG. 7 .

Fig. 9 is a structural schematic view of the tight sleeve and the insert sleeve of the present invention.

FIG. 10 is an enlarged view at point C in FIG. 9 .

Fig. 11 is a schematic structural view of the fixed plug sleeve of the present invention.

Fig. 12 is a structural schematic diagram of the complete connection between the steel pipe joint and the steel pipe of the present invention.

In the figure: 1, fixed through head, 11, positioning ring groove, 12, first external thread, 2, locking cap, 21, constant pressure sleeve, 22, locking cap, 23, first internal thread, 24, second External thread, 25, guide chute, 26, guide slip ring, 27, push port, 28, third external thread, 29, second internal thread, 3, compact sleeve, 31, radial closing, 32, third Step, 33, the first suction shrinkage groove, 4, fixed plug cover, 41, the second suction shrinkage groove, 5, insert fixed sleeve, 51, limit ring pad, 52, suction ring groove, 6, steel pipe.

Detailed ways

The following is a clear and complete description of the technical solutions in the implementation of the present invention in conjunction with the accompanying drawings, and the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

As shown in Figures 1 to 12, a steel pipe connector provided by Embodiment 1 of the present invention includes a fixed-through head 1 with an "I"-shaped structure in cross section, and two ends of the fixed-through head 1 are formed. Symmetrical positioning ring groove 11, the positioning ring groove 11 is used for inserting the steel pipe 6, symmetrical first external threads 12 are arranged on the outer peripheral surface of the fixed through head 1, one first external thread 12 corresponds to one first internal thread 23 and The first external thread 12 is adapted to the corresponding first internal thread 23, one first internal thread 23 corresponds to one locking cap 2, the first internal thread 23 is adapted to be arranged on the inner peripheral surface of the locking cap 2, and the locking cap 2 is inserted Set on the outer peripheral surface of the steel pipe 6, in order to make the lock cap 2 and the steel pipe 6 more tightly and at the same time improve the sealing performance of the connection, a tight sleeve 3 is arranged between the lock cap 2 and the steel pipe 6, and the tight sleeve 3 has a certain Elasticity, the elasticity deforms in the radial direction. When installing, first set the two locking caps 2 on the 6 ports of the two steel pipes, and then set the two tight sleeves 3 on the 6 ports of the two steel pipes, and then put the The ports connected by the two steel pipes 6 are pressed and inserted into the positioning ring groove 11, and then the locking cap 2 is squeezed into the tight sleeve 3, and then the locking cap 2 is turned until the first internal thread 23 and the first external thread 12 Complete spiral connection, so that no special design is required for the ports of the steel pipes 6, and the two steel pipes 6 can be tightly connected together, and the steel pipes 6 cut off during construction can still be connected, which improves the utilization of the steel pipes 6 and makes the connection The flexibility and adaptability of the head and the steel pipe 6 are greatly improved. At the same time, the tight sleeve 3 is tightly squeezed between the locking cap 2 and the steel pipe 6 during connection, which not only improves the stability of the connection, but also increases the tightness of the connection. In addition, the structure of the steel pipe 6 can not only be the cylindrical structure provided by the present invention, but also a square columnar structure, an elliptical columnar structure, etc., but it is necessary to ensure that the circumference of the first external thread 12 and the first internal thread 23 are set, that is, The locking cap 2 is always in a cylindrical structure, and the outer peripheral surface of the tight sleeve 3 and the outer peripheral surface of the fixed through head 1 are always in a cylindrical structure.

Combining Figures 5 to 8, in this example 1, since the locking cap 2 first squeezes the compact sleeve 3, the compact sleeve 3 will bounce back against the locking cap. When being hindered, the locking cap 2 is set as a constant pressure sleeve 21 and a locking cap 22 that cooperate with each other. The locking cap 22 is sleeved on the constant pressure sleeve, and the outer peripheral surface of one end of the constant pressure sleeve 21 close to the fixed through head 1 is provided with a second outer surface. The thread 24, the second external thread 24 is provided with a concave guide groove 25 on the side away from the fixed through head 1, the guide groove 25 is set on the outer peripheral surface of the pressure sleeve 21, and the first internal thread 23 is arranged on the locking cap 22 On the inner peripheral surface of the inner peripheral surface, the second external thread 24 is adapted to the first internal thread 23 and the two are always screwed together. The inner peripheral surface of the locking cap 22 away from the end of the fixed through head 1 is provided with a guide slip ring 26, and the guide slip ring 26 is adapted to the guide chute 25. During installation, the constant pressure sleeve 21 is squeezed and fitted on the tight sleeve 3 first. In the screw lock cap 22, the guide slip ring 26 is in the guide chute 25 and along the guide chute. 25 rotates and moves toward the fixed through head 1, and the first internal thread 23 gradually moves toward the fixed through head 1, so that the end of the first internal thread 23 close to the fixed through head 1 spirals through the second external thread 24 and gradually connects with the first external thread 12 threaded connection, when the first external thread 12 is fully connected with the first internal thread 23, the end of the first internal thread 23 away from the fixed through head 1 is now threaded with the second external thread 24, and the locking cap 2 and the fixed through head 1 is completely connected, so that the two steel pipes 6 are locked together with the connecting head, and the fastening is stable.

Referring to Fig. 1, in this example 1, in order to improve the sealing performance of the tight sleeve 3 to the steel pipe 6, the tight sleeve 3 is provided with a radial closing 31 that penetrates the tight sleeve 3 in a radial direction, and the elasticity of the tight sleeve 3 is still around. When the fixed pressure sleeve 21 squeezes the tight sleeve 3, the radial closing 31 shrinks to close, and the constant pressure sleeve 21 and the tight sleeve 3 have an interference fit, so that the steel pipe 6 and the joint are more tightly and tightly connected together , will not make the two steel pipes 6 and the connection head loose or even fall off, and the sealing performance between the connection head and the steel pipe 6 is higher, effectively avoiding the leakage of the medium transported by the steel pipe 6 .

9, in this example one, in order to further improve the sealing performance of the tight sleeve 3 to the steel pipe 6 and the tightness of the connection between the tight sleeve 3 and the locking cap 2 and the steel pipe 6, the first step, the second The ladder-like structure of two steps and the third step, the first step, the second step, and the third step 32 are arranged in sequence from the end close to the fixed through head 1 to the end far away from the fixed through head 1 and their outer diameters increase sequentially. The first step, the second step, and the third step 32 have the same inner diameter, and the inner peripheral surface of the constant pressure sleeve 21 is adapted to the first step and the second step of the tight sleeve 3, effectively preventing the tight sleeve 3 from pulling the steel pipe 6 When the tight sleeve 3 breaks away from the locking cap 2 along with the steel pipe 6, the outer diameter of the end of the third step 32 away from the fixed through head 1 is slightly larger than the inner diameter of the locking cap 22, and the outer diameter of the third step 32 is farther away from the fixed end. From one end of the through head 1 to the end close to the fixed through head 1, the first shrinkage groove 33 is arranged on the inner peripheral surface of the third step 32 along the axis, and the first shrinkage groove 33 is located on the locking cap 22 The third step 32 of screw extrusion shrinks and shrinks when compressed, and the first suction shrinkage groove 33 has a certain accommodation for the third step 32, so that the tightness between the steel pipe 6 and the tight sleeve 3 is tighter. During the connection and locking process of the fixed through head 1, the radial closing 31 of the tight sleeve 3 promotes the first suction shrinkage groove 33 to absorb the inner wall of the steel pipe 6, and at the same time the teeth formed between the two first suction shrinkage grooves 33 The pawl bounces back and grasps the outer wall of the steel pipe 6, thereby greatly preventing the two steel pipes 6 from being disconnected when being pulled.

Referring to Fig. 1, in the first example, the volume of the first shrinkage groove 33 gradually increases from the end away from the fixed head 1 to the end close to the fixed head 1, and the radial closing 31 at the third step 32 The opening is larger than the opening of the radial closing 31 at the first step and the second step, which ensures the locking efficiency of the locking cap 22 while improving the contraction compactness of the third step 32 .

5 to 8, in this example one, in order to promote the efficiency of the locking cap 22 squeezing the third step 32, a trumpet-shaped push port is provided on the inner peripheral surface of the locking cap 22 near the end of the fixed through head 1. 27, and the inner diameter of the push port 27 gradually expands toward the direction away from the guide groove 25, and the push port 27 is adapted to be set on the third step 32 in the extrusion process.

On the basis of the first example, in order to further improve the tightness between the inner wall of the steel pipe 6 and the positioning ring groove 11, in conjunction with Fig. The fixed plug sleeve 4 is configured, and the fixed plug sleeve 4 has certain elasticity, and the elasticity deforms along the radial direction.

In the second example, in order to further improve the tightness of the steel pipe 6 in the positioning ring groove 11, the outer diameter of the fixed plug sleeve 4 gradually increases from the end far away from the positioning ring groove 11 to the end located in the positioning ring groove 11, As the steel pipe 6 is gradually inserted into the positioning ring groove 11, the compression deformation of the fixed plug sleeve 4 is greater, and the fixed plug sleeve 4 rebounds against the inner wall of the steel pipe 6, so that the inner peripheral surface of the positioning ring groove 11 passes through the fixed plug sleeve. 4. Interference fit with the inner wall of the steel pipe 6 greatly improves the connection fastness, and further improves the sealing performance, thereby effectively strengthening the stability of the steel pipe 6 in the positioning ring groove 11, and helping the locking cap 2 to the steel pipe 6. Locking.

In the second example, in order to further speed up the efficiency of inserting the steel pipe 6 into the positioning ring groove 11, the second suction shrinkage groove 41 is arranged along the axis on the outer peripheral surface of the fixed plug sleeve 4. When the sleeve 4 is compressed, the shrinkage becomes smaller, and the second suction shrinkage groove 41 has a certain accommodation for the fixed plug sleeve 4, so that the insertion efficiency of the steel pipe 6 into the positioning ring groove 11 is accelerated, and the connection between the locking cap 2 and the fixed through head 1 is locked. During the process, the tight sleeve 3 seals the fixed plug sleeve 4 in the positioning ring groove 11, and promotes the second suction shrinkage groove 41 to produce solid absorption on the inner wall of the steel pipe 6. At the same time, the teeth formed between the two second suction shrinkage grooves 41 The claw rebounds to grasp the inner wall of the steel pipe 6, thereby greatly preventing the two steel pipes 6 from being disconnected when being pulled.

In this example two, in conjunction with Fig. 11, in order to further ensure that the steel pipe 6 is inserted into the positioning ring groove 11 quickly and unimpeded, by ensuring that the second suction shrinkage groove 41 absorbs the inner wall of the steel pipe 6 solidly, the second suction shrinkage groove 41 moves away from the The volume from one end of the positioning ring groove 11 to the end located in the positioning ring groove 11 is gradually increased.

On the basis of this example 1, in order to further improve the tightness between the outer wall of the steel pipe 6 and the positioning ring groove 11, and further improve the positioning accuracy of the tight sleeve 3 at the port of the steel pipe 6 when the tight sleeve 3 is installed, this invention is combined with FIG. 9 . Example 3, an inserting sleeve 5 is provided at the end of the dense sleeve 3 close to the fixed through head, and the inserting sleeve 5 and the dense sleeve 3 are integrally formed, and the radial closing port 31 extends to the inserting sleeve 5 and penetrates the inserting sleeve 5, The opening of the radial closing 31 at the insertion sleeve 5 is equal to the opening of the radial closing 31 at the first step and the second step, the deformation of the insertion sleeve 5 is the same as that of the tight sleeve 3, and the length of the insertion sleeve 5 The same as the length of the outer peripheral surface of the positioning ring groove 11, in order to make the insertion sleeve 5 socketed on the steel pipe 6 port, a limit ring pad 51 is set on the inner wall of the end of the insertion sleeve 5 away from the tight sleeve 3, and the limit ring pad 51 The radial closing 31 is not provided, and the limit ring gasket 51 is elastically deformed in the radial direction, axial direction and axial direction. On the limit ring pad 51, then insert the steel pipe 6 into the positioning ring groove 11, the inserting sleeve 5 is squeezed, the radial closing 31 is narrowed to close, and the outer wall of the steel pipe 6 interferes with the positioning ring groove 11 through the inserting sleeve 5 Cooperate, further improve the tightness that this connecting head is connected with steel pipe 6, also improve sealing performance simultaneously.

In this example three, referring to Fig. 10, the two side walls of the limit ring pad 51 are provided with concave suction ring grooves 52, and the steel pipe 6 squeezes the limit ring pad 51 into the positioning ring groove 11, and the two suction ring grooves The air at 52 is exhausted and sucked respectively to the side wall of the steel pipe 6 and the side wall of the positioning ring groove 11, so as to further improve the fastening and sealing effect.

On the basis of this example one, in order to further improve the locking stability of the two locking caps 22 on the entire connector, in conjunction with Figures 5 to 8, in Embodiment 4 of the present invention, the outer peripheral surface of one locking cap 22 is close to the fixed One end of the through head 1 is provided with a concave end connection groove, the groove surface of the end connection groove is provided with a third external thread 28, and another locking cap 22 is provided with an end connection ring near the end of the fixed through head 1, and the end connection ring is connected with the end connection. The connection groove is adapted, the inner peripheral surface of the termination ring is provided with a second internal thread 29, and the second internal thread 29 is adapted to the third external thread 28. During installation, the termination ring rotates and gradually fits in the termination groove. The second internal thread 29 is threadedly connected with the third external thread 28, and the two locking caps 22 are screwed together to form one body and cover the fixed through head 1. The entire connecting head has multi-level threaded connections, which can effectively avoid the phenomenon of thread loosening, and at the same time The two locking caps 22 relatively gather the entire connecting head, which can increase the resistance of the two steel pipes 6 when being pulled, thereby improving the locking and fixing of the entire connecting head to the steel pipe 6 .

When in use: in combination with Figure 12, first set the two locking caps 2 on the ports of the two steel pipes 6 respectively, and then respectively set the two tight sleeves 3 and the inserting sleeves 5 on the ports of the two steel pipes 6, and the two The port of the steel pipe 6 reaches the limit ring pad 51, and then the two fixed plug sleeves 4 are respectively set on the inner peripheral surface of the positioning ring groove 11, and then the two steel pipes 6 are respectively inserted into the positioning ring groove 11 until they are inserted. The fixed sleeve 5 is fully inserted into the positioning ring groove 11. At this time, the positioning ring groove 11 is interference-fitted with the steel pipe 6 by inserting the fixed sleeve 5, the fixed plug sleeve 4, and the two steel pipes 6 are fixed in the positioning ring groove 11 without moving. Then the two constant pressure sleeves 21 are correspondingly squeezed and fitted on the tight sleeve 3, and then the two locking caps 22 are respectively screwed and the third step 32 is squeezed until the first internal thread 23 and the first external thread 12 Threaded connection, at this time the locking cap 22 is interference fit with the steel pipe 6 through the tight sleeve 3, when screwing the two locking caps 22: first screw the locking cap 22 with the third external thread 28, and then screw the locking cap 22 with the third external thread 28 The locking cap 22 of two internal threads 29, when the locking cap 22 with the second internal thread 29 is fully connected with the fixed through head 1, the second internal thread 29 is also fully threaded with the third external thread 28, so that the connecting head It is tightly connected with two steel pipes 6, so that the connection between the two steel pipes 6 is tight, and the phenomenon of loosening or even falling off will not occur for a long time, and the tight sleeve 3, the fixed sleeve 5, and the fixed plug sleeve 4 are squeezed tightly , so that the sealing effect between the connecting head and the steel pipe 6 is improved, effectively preventing the leakage of the transported medium, and the practicability is good; at the same time, no special design is required for the port of the steel pipe 6, and the steel pipe 6 can be installed as required during construction. Cutting, the connector has high flexibility and adaptability, and also improves the utilization rate of the steel pipe 6, and also effectively solves the problems of low welding efficiency, virtual welding or missing welding in existing welding.

It will be obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, but that it can be embodied in other specific forms without departing from the spirit and essential characteristics of the invention. Accordingly, the embodiments should be regarded in all points of view as exemplary and not restrictive, the scope of the invention being defined by the appended claims rather than the foregoing description, and it is therefore intended that the scope of the invention be defined by the appended claims rather than by the foregoing description. All changes within the meaning and range of equivalents of the elements are embraced in the present invention. Any reference sign in a claim should not be construed as limiting the claim concerned.

In addition, it should be understood that although this specification is described according to implementation modes, not each implementation mode only includes an independent technical solution, and this description in the specification is only for clarity, and those skilled in the art should take the specification as a whole, The technical solutions in the various embodiments can also be properly combined to form other implementations that can be understood by those skilled in the art.

Claims (10)

1. A steel pipe connector, characterized in that it comprises a fixed head, the two ends of the fixed head are symmetrically provided with positioning ring grooves, and the inner peripheral surface of each of the positioning ring grooves is provided with a fixed plug The outer peripheral surface of the positioning ring groove is symmetrically provided with first external threads, and each of the first external threads is corresponding to a locking cap, and the inner peripheral surface of each of the locking caps is provided with the first external thread. Each of the locking caps is also pressed against the tight sleeve provided on both sides of the positioning ring groove. 2. A steel pipe joint according to claim 1, characterized in that each of the locking caps includes a pressure-constant sleeve and a locking cap adapted to each other; the first internal thread is arranged on the locking cap On the inner peripheral surface, the first internal thread is always connected to the second external thread, and the second external thread is arranged at the end of the outer peripheral surface of the constant pressure sleeve close to the fixed through head, and the outer peripheral surface of the constant pressure sleeve is provided with a guide groove , a guide slip ring is adapted to be arranged in the guide slide groove, and the guide slip ring is arranged on an end of the inner peripheral surface of the locking cap away from the fixed through head. 3. A steel pipe connector according to claim 2, characterized in that, one end of the outer peripheral surface of the locking cap away from the slip ring is provided with a terminal groove, and the peripheral surface of the terminal groove is provided with The third external thread, the end of the other locking cap away from the slip ring is provided with a terminal ring adapted to the terminal groove, and the inner peripheral surface of the terminal ring is provided with a second internal thread that matches the third external thread. thread. 4 . The steel pipe joint according to claim 2 , wherein the tight sleeve is provided with a radial opening that penetrates the tight sleeve in a radial direction. 5 . 5. A steel pipe joint according to claim 2, wherein the tight sleeve is arranged in a stepped structure; the tight sleeve includes an outer diameter from one end close to the fixed through head to one end far away from the fixed through head One end of the first step, the second step, and the third step increase in turn, the inner peripheral surface of the constant pressure sleeve is adapted to the first step and the second step, and the outer diameter of the third step is larger than the locking The inner diameter of the cap, the inner peripheral surface of the third step is provided with a first shrinkage groove arranged along the axis. 6 . The steel pipe joint according to claim 5 , wherein the outer diameter of the third step gradually increases from an end far away from the fixed through head to an end close to the fixed through head. 6 . 7. A steel pipe connector according to claim 4, characterized in that an inserting sleeve is provided at one end of the tight sleeve close to the fixed through head, and the inserting sleeve is attached to the outer peripheral surface of the positioning ring groove , the radial closure extends through the fixed sleeve, and the end of the inner peripheral surface of the fixed sleeve away from the tight sleeve is provided with a limit ring pad. 8 . The steel pipe joint according to claim 7 , wherein both side walls of the limiting ring pad are provided with concave suction ring grooves. 9. A steel pipe connector according to claim 2, characterized in that, the end of the inner peripheral surface of the locking cap away from the guide slip ring is provided with a trumpet-shaped push port, and the inner diameter of the push port is from close to the guide slip ring From one end of the ring to the end away from the slip ring, it gradually expands. 10. A steel pipe connector according to claim 1, characterized in that the outer diameter of the fixed plug sleeve gradually increases from the port of the positioning ring groove to the inside of the positioning ring groove, and the outer peripheral surface of the fixed plug sleeve A second suction groove arranged along the axis is arranged on the top.

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