CN115638297A

CN115638297A - Steel pipe connector

Info

Publication number: CN115638297A
Application number: CN202211443309.9A
Authority: CN
Inventors: 赵祥雷; 赵辉辉
Original assignee: Xuzhou Tongle Pipe Industry Co ltd
Current assignee: Xuzhou Tongle Pipe Industry Co ltd
Priority date: 2022-11-18
Filing date: 2022-11-18
Publication date: 2023-01-24
Anticipated expiration: 2042-11-18
Also published as: CN115638297B

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

Steel pipe connector

Technical Field

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

Background

The steel pipe relates to the aspect of daily life, the steel pipe is commonly used as a conveying pipeline in the conveying process of various media such as water, gas, oil and the like, two steel pipes are usually needed to be butted to enable the conveying pipeline to be installed or extended during installation, in the prior art, flanges or threads are designed at one end or two ends of the steel pipe, only the two specific steel pipes can be connected together, if the steel pipe needs to be cut off according to the length of the conveying pipeline, a new port can be formed, the two steel pipes cannot be connected due to the fact that no matched flange or thread exists at the new port, the two steel pipes can not be connected due to the fact that the flanges or threads are designed at the port of the steel pipe to enable the two steel pipes to be connected, the steel pipe needs to be specific, flexibility is low, adaptation degree is low, in addition, the connection tightness is relatively poor, the two steel pipes are connected in a welding mode, installation efficiency is low, and the phenomenon of insufficient welding or missing welding is easy to occur.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides the steel pipe connector, which can tightly abut against and tightly connect two steel pipes without any requirement on the port design of the steel pipes, and has the advantages of high flexibility, good sealing property and stable connection.

In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a steel pipe connector, includes that one decides to lead to head, symmetrical arrangement's solid cover of close, symmetrical arrangement's fixed choke plug and two locking caps, the both ends symmetry of deciding to lead to the head is provided with the positioning ring groove, and a positioning ring groove corresponds a fixed choke plug, decide the choke plug correspondence and cup joint on the inner peripheral surface of positioning ring groove, the outer peripheral face symmetry of positioning ring groove is provided with first external screw thread, and a first external screw thread corresponds a locking cap, the inner peripheral surface of locking cap be provided with first external screw thread complex first internal thread, a close solid cover corresponds a locking cap, close solid cover sets up in the locking cap.

Preferably, each locking cap comprises a constant pressure sleeve and a locking cap, a second external thread matched with the first internal thread is arranged at one end, close to the constant pressure head, of the outer peripheral surface of the constant pressure sleeve, a concave guide sliding groove is further formed in the outer peripheral surface of the constant pressure sleeve, a guide sliding ring matched with the guide sliding groove is arranged at one end, far away from the constant pressure head, of the inner peripheral surface of the locking cap, and the first internal thread is arranged on the inner peripheral surface of the locking cap.

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

Preferably, the sealing sleeve is provided with a radial closing-in which radially penetrates through the sealing sleeve.

Preferably, the sealing sleeve is of a stepped structure and comprises a first step, a second step and a third step, the outer diameter of the first step, the second step and the third step are sequentially increased from one end close to the fixed through head to one end far away from the fixed through head, the inner circumferential surface of the fixed pressing sleeve is matched 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 a first suction groove arranged along the axis is formed in the inner circumferential surface of the third step.

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

Preferably, one end of the inner peripheral surface of the locking cap, which is close to the fixed through head, is provided with a trumpet-shaped pushing opening, and the inner diameter of the pushing opening is gradually enlarged towards the direction away from the guide chute.

Preferably, the one end that the solid cover of close is close to and decides the logical head is provided with inserts the cover, insert the cover and paste with the outer peripheral face of positioning ring groove and connect, radial binding off extends to run through and decides the cover, and inserts radial binding off opening on the cover and equals radial binding off opening on first ladder, the second ladder and is less than the radial binding off opening on the third ladder, the one end that the solid cover of close was kept away from to the cover inner peripheral surface of inserting is provided with the spacing ring pad.

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

Preferably, the outer diameter of the stopper sleeve gradually increases from the end of the retainer ring groove into the retainer ring groove.

Preferably, a second suction groove arranged along the axis is arranged on the outer peripheral surface of the fixed plug sleeve.

The invention has the beneficial effects that: the steel pipe connector is provided with the fixed through head, the sealing sleeve, the fixed plug sleeve and the locking cap, has higher flexibility and adaptation degree, can fasten and connect the common steel pipe tightly without performing any special treatment such as screw threads, flanges and the like on the steel pipe, and also effectively solves the problems of low welding efficiency and insufficient welding or missing welding existing in the existing welding; during construction, after the steel pipe is cut according to needs, the cut steel pipe can still be fastened and compactly connected through the connector, so that the utilization rate of the steel pipe is improved; the fixed pressure sleeve and the locking cap which are matched with each other are arranged, so that the locking cap and the fixed through head can be quickly connected while the sealing sleeve is extruded and locked, and the working efficiency of connecting the two steel pipes is improved; the steel pipe connector is in interference fit with the steel pipe through the sealing sleeve and the fixed plug sleeve, the phenomenon of looseness and even falling cannot occur for a long time, the stability and the sealing effect are good, and the leakage of a transported medium is effectively prevented.

Drawings

FIG. 1 is a schematic view of a disassembled structure of the steel pipe joint of the present invention.

FIG. 2 is a schematic view of the state structure of the steel pipe joint in the assembly process of the present invention.

FIG. 3 is a schematic view of the structure of the present invention for fully connecting two locking caps of a steel pipe connector.

Fig. 4 is a schematic structural diagram of the pilot head of the present invention.

FIG. 5 is a schematic view of a locking cap of the present invention.

Fig. 6 is an enlarged view of a portion a in fig. 5.

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

Fig. 8 is an enlarged view at B in fig. 7.

Fig. 9 is a schematic structural view of the sealing sleeve and the insertion sleeve of the present invention.

Fig. 10 is an enlarged view at C in fig. 9.

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

FIG. 12 is a schematic view of the structure of the steel pipe joint of the present invention fully connected to a steel pipe.

In the figure: 1. the device comprises a fixed through head, 11, a positioning ring groove, 12, a first external thread, 2, a locking cap, 21, a fixed pressure sleeve, 22, a locking cap, 23, a first internal thread, 24, a second external thread, 25, a guide sliding groove, 26, a guide sliding ring, 27, a pushing opening, 28, a third external thread, 29, a second internal thread, 3, a sealing sleeve, 31, a radial closing-in groove, 32, a third step, 33, a first suction groove, 4, a fixed plug sleeve, 41, a second suction groove, 5, an inserting sleeve, 51, a limiting ring pad, 52, a suction ring groove, 6 and a steel pipe.

Detailed Description

The technical solutions in the implementation of the present invention will be made clear and fully described below with reference to the accompanying drawings, and the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 12, a steel pipe joint according to a first embodiment of the present invention includes a fixed through head 1 having an i-shaped cross section, two symmetrical positioning ring grooves 11 formed at two ends of the fixed through head 1, the positioning ring groove 11 is used for inserting a 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, the first external thread 12 is matched with the corresponding first internal thread 23, one first internal thread 23 corresponds to one locking cap 2, the first internal thread 23 is matched and arranged on the inner peripheral surface of the locking cap 2, the locking cap 2 is inserted and sleeved on the outer peripheral surface of the steel pipe 6, in order to enable the locking cap 2 and the steel pipe 6 to be fastened more and improve the connection tightness, a sealing sleeve 3 is arranged between the locking cap 2 and the steel pipe 6, the sealing sleeve 3 has certain elasticity, the elasticity deforms along the radial direction, when in installation, firstly, two locking caps 2 are respectively sleeved at the port parts of two steel pipes 6, then two sealing sleeves 3 are respectively sleeved at the port parts of the two steel pipes 6, then the ports connected with the two steel pipes 6 are respectively and tightly propped and inserted into the positioning ring grooves 11, then the locking caps 2 are extruded and sleeved towards the sealing sleeves 3, the knob of the locking cap 2 is then continued until the first internal thread 23 is fully screwed with the first external thread 12, thus, the two steel pipes 6 can be tightly connected together without specially designing the ports of the steel pipes 6, the cut steel pipes 6 can still be connected during construction, the utilization rate of the steel pipes 6 is improved, the flexibility and the adaptation degree of the connector and the steel pipes 6 are greatly improved, meanwhile, the sealing sleeve 3 is tightly extruded between the locking cap 2 and the steel pipe 6 during connection, so that the connection stability is improved, and the connection tightness is improved; the structure of the steel pipe 6 may be not only a cylindrical structure provided by the present invention, but also a square column structure, an elliptic column structure, etc., but it is ensured that the circumferential arrangement of the first external thread 12 and the first internal thread 23, that is, the locking cap 2 is always a cylindrical structure, and the outer circumferential surface of the sealing sleeve 3 and the outer circumferential surface of the fixing head 1 are always cylindrical structures.

With reference to fig. 5 to 8, in the first embodiment, since the locking cap 2 firstly presses the sealing sleeve 3 in a sleeving manner, the sealing sleeve 3 will rebound to press the locking cap tightly, in order to prevent the locking cap 2 from being obstructed when the knob is connected to the fixed through head 1, the locking cap 2 is provided with a fixed pressure sleeve 21 and a locking cap 22 which are mutually matched, the locking cap 22 is sleeved on the fixed pressure sleeve, the outer peripheral surface of one end of the fixed pressure sleeve 21 close to the fixed through head 1 is provided with a second external thread 24, one side of the second external thread 24 far away from the fixed through head 1 is provided with a concave guide chute 25, the guide chute 25 is provided on the outer peripheral surface of the pressure sleeve 21, the first internal thread 23 is provided on the inner peripheral surface of the locking cap 22, the second external thread 24 is adapted to the first internal thread 23 and is always in threaded connection with the first internal thread 23, when the locking cap 22 is installed, the fixed pressing sleeve 21 is firstly extruded and sleeved on the sealing sleeve 3, the sliding guide ring 26 rotates in the sliding guide groove 25 and moves towards the fixed through head 1 along the sliding guide groove 25 at the spiral locking cap 22, the first internal thread 23 gradually moves towards the fixed through head 1, one end of the first internal thread 23 close to the fixed through head 1 is spirally connected with the first external thread 12 gradually through the second external thread 24, when the first external thread 12 is completely connected with the first internal thread 23, one end of the first internal thread 23 far from the fixed through head 1 is connected with the second external thread 24 in a threaded mode, the locking cap 2 is completely connected with the fixed through head 1, and the two steel pipes 6 are locked with the connector together, so that the fastening is stable.

With reference to fig. 1, in the first embodiment, in order to improve the sealing performance of the sealing sleeve 3 to the steel tube 6, the sealing sleeve 3 is provided with a radial closing-in 31 radially penetrating through the sealing sleeve 3, the elasticity of the sealing sleeve 3 deforms in the circumferential direction, the radial closing-in 31 is reduced to be closed when the sealing sleeve 3 is extruded by the fixed pressure sleeve 21, and the fixed pressure sleeve 21 and the sealing sleeve 3 are in interference fit, so that the steel tube 6 and the connector are connected together more tightly and tightly, the phenomenon that the two steel tubes 6 and the connector are loosened or even fall off is avoided, the sealing performance between the connector and the steel tube 6 is higher, and the leakage of media transported by the steel tube 6 is effectively avoided.

With reference to fig. 9, in the first embodiment, in order to further improve the sealing performance of the sealing sleeve 3 to the steel pipe 6 and the fastening performance of the sealing sleeve 3 to the locking cap 2 and the steel pipe 6, the first step, the second step and the third step are arranged in a step-like structure, the first step, the second step and the third step 32 are sequentially arranged from the end close to the fixed through head 1 to the end far from the fixed through head 1, and the outer diameters of the first step, the second step and the third step are sequentially increased, the inner diameters of the first step, the second step and the third step 32 are the same, the inner circumferential surface of the fixed pressing sleeve 21 is matched with the first step and the second step of the sealing sleeve 3, so as to effectively prevent the situation that the sealing sleeve 3 is separated from the locking cap 2 along with the steel pipe 6 when the sealing sleeve 3 pulls the steel pipe 6, the outer diameter of the end of the third step 32 far 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 gradually increased from one end far away from the fixed through head 1 to one end close to the fixed through head 1, the first suction groove 33 is arranged on the inner peripheral surface of the third step 32 along the axis, the first suction groove 33 shrinks and becomes smaller when the locking cap 22 spirally extrudes the third step 32 to compress, the first suction groove 33 has certain accommodation for the third step 32, so that the steel pipe 6 and the sealing sleeve 3 are more tightly abutted, in the process of connecting and locking the locking cap 2 and the fixed through head 1, the radial direction 31 of the sealing sleeve 3 promotes the first suction groove 33 to fixedly absorb the inner wall of the steel pipe 6, and simultaneously, the claw formed between the two first suction grooves 33 rebounds and tightly grips the outer wall of the steel pipe 6, thereby greatly avoiding the two steel pipes 6 from being disconnected when being pulled.

Referring to fig. 1, in the first embodiment, the first suction groove 33 is disposed from the end far away from the fixed through head 1 to the end near the fixed through head 1, and the opening of the radial contraction opening 31 at the third step 32 is larger than the opening of the radial contraction opening 31 at the first step and the second step, so as to improve the contraction compactness of the third step 32 and ensure the locking efficiency of the locking cap 22.

With reference to fig. 5 to 8, in the first example, in order to improve the efficiency of the locking cap 22 to extrude the third step 32, a trumpet-shaped pushing opening 27 is provided at one end of the inner peripheral surface of the locking cap 22 close to the gate 1, and the inner diameter of the pushing opening 27 is gradually enlarged in the direction away from the guide chute 25, and the pushing opening 27 is adapted to the third step 32 during the extrusion process.

In order to further improve the tightness between the inner wall of the steel pipe 6 and the positioning ring groove 11 based on the first embodiment, referring to fig. 11, in the second embodiment of the present invention, the fixed plug sleeve 4 is disposed between the inner circumferential surface of the positioning ring groove 11 and the inner wall of the steel pipe 6, and the fixed plug sleeve 4 has a certain elasticity and is deformed in the radial direction.

In the second embodiment, in order to further improve the abutting compactness of the steel pipe 6 in the positioning ring groove 11, the outer diameter of the fixed plug sleeve 4 is gradually increased from the end far away from the positioning ring groove 11 to the end located in the positioning ring groove 11, and as the steel pipe 6 is gradually inserted into the positioning ring groove 11, the compression deformation of the fixed plug sleeve 4 is larger, the fixed plug sleeve 4 rebounds to abut against the inner wall of the steel pipe 6, so that the inner peripheral surface of the positioning ring groove 11 is in interference fit with the inner wall of the steel pipe 6 through the fixed plug sleeve 4, the connection tightness is greatly improved, the tightness is further improved, the stability of the steel pipe 6 in the positioning ring groove 11 is further enhanced, and the locking of the locking cap 2 on the steel pipe 6 is facilitated.

In the second embodiment, in order to further accelerate the efficiency of inserting the steel pipe 6 into the positioning ring groove 11, the second shrinkage absorption groove 41 is arranged on the outer peripheral surface of the fixed plug sleeve 4 along the axis, the second shrinkage absorption groove 41 shrinks less when the fixed plug sleeve 4 is compressed, the second shrinkage absorption groove 41 has a certain accommodation for the fixed plug sleeve 4, so that the efficiency of inserting the steel pipe 6 into the positioning ring groove 11 is accelerated, in the process of connecting and locking the locking cap 2 and the fixed through head 1, the fixed plug sleeve 4 is sealed in the positioning ring groove 11 by the sealing sleeve 3, the second shrinkage absorption groove 41 is promoted to absorb and fix the inner wall of the steel pipe 6, and simultaneously, claws formed between the two second shrinkage absorption grooves 41 rebound to tightly grasp the inner wall of the steel pipe 6, so that the two steel pipes 6 are greatly prevented from being broken when being pulled.

In the second embodiment, referring to fig. 11, in order to further ensure that the steel pipe 6 is inserted into the positioning ring groove 11 quickly and without being blocked, the second suction groove 41 is arranged to ensure that the inner wall of the steel pipe 6 is sucked and fixed by the second suction groove 41, and the volume of the second suction groove 41 is gradually increased from the end far away from the positioning ring groove 11 to the end located in the positioning ring groove 11.

On the basis of the first embodiment, in order to further improve the tightness between the outer wall of the steel pipe 6 and the positioning ring groove 11 and also further improve the positioning accuracy of the end opening of the steel pipe 6 when the sealing sleeve 3 is installed, in the third embodiment of the invention, referring to fig. 9, the insertion sleeve 5 is arranged at one end of the sealing sleeve 3 close to the positioning through head, the insertion sleeve 5 and the sealing sleeve 3 are integrally formed, the radial closing-up 31 extends to the insertion sleeve 5 to penetrate through the insertion sleeve 5, the opening of the radial closing-up 31 at the insertion sleeve 5 is equal to the opening of the radial closing-up 31 at the first step and the second step, the deformation of the insertion sleeve 5 and the sealing sleeve 3 is the same, the length of the insertion sleeve 5 is the same as the length of the outer peripheral surface of the positioning ring groove 11, in order to enable the insertion sleeve 5 to be sleeved on the end of the steel pipe 6, the inner wall of one end of the insertion sleeve 5 far away from the sealing sleeve 3 is provided with the positioning ring cushion 51, the radial closing-up ring cushion 31 is not provided on the positioning ring cushion 51, the insertion sleeve 5 is elastically deformed in the radial closing-up, the axial direction, the elastic deformation of the insertion sleeve 5, the positioning ring 5 is also is connected with the positioning sleeve 5, and the positioning ring 5, the end opening of the insertion sleeve 5 is further improved, and the steel pipe 6, and the sealing sleeve 5 is connected with the positioning ring 5, and the steel pipe by extruding, and the steel pipe 6, and the positioning ring 5, and the positioning ring groove 11, and the steel pipe is also improved.

In the third embodiment, referring to fig. 10, the two side walls of the limit ring pad 51 are provided with the concave circular suction grooves 52, the steel pipe 6 extrudes the limit ring pad 51 in the circular positioning groove 11, and air in the two circular suction grooves 52 is exhausted and is respectively sucked and fixed on the side wall of the steel pipe 6 and the side wall of the circular positioning groove 11, so that the fastening and sealing effects are further improved.

On the basis of the first embodiment, in order to further improve the locking stability of the two locking caps 22 to the whole connector, with reference to fig. 5 to 8, in embodiment 4 of the present invention, one end of the outer peripheral surface of one of the locking caps 22, which is close to the fixed through head 1, is provided with an inward concave terminating groove, the groove peripheral surface of the terminating groove is provided with a third external thread 28, the other locking cap 22, which is close to one end of the fixed through head 1, is provided with a terminating ring, the terminating ring is adapted to the terminating groove, the inner peripheral surface of the terminating ring is provided with a second internal thread 29, the second internal thread 29 is adapted to the third external thread 28, during installation, the terminating ring is gradually sleeved in the terminating groove in a rotating manner, the second internal thread 29 is in threaded connection with the third external thread 28, the two locking caps 22 are spirally connected into a whole body and cover the fixed through head 1, the whole connector has a multi-layer threaded connection, which effectively avoids the phenomenon of thread loosening of the connector, and the whole connector is relatively gathered together by the two locking caps 22, which can increase the resistance of the two steel pipes 6 when the whole connector is pulled, thereby improving the locking and fixing of the steel pipes 6.

When in use: referring to fig. 12, firstly, two locking caps 2 are respectively sleeved at the port positions of two steel pipes 6, then, two sealing sleeves 3 and two plugging sleeves 5 are respectively sleeved at the port positions of two steel pipes 6, and the ports of two steel pipes 6 are abutted to a limit ring pad 51, then, two plugging sleeves 4 are respectively sleeved on the inner circumferential surface of a positioning ring groove 11, then, two steel pipes 6 are respectively inserted into the positioning ring groove 11 until the plugging sleeves 5 are completely inserted into the positioning ring groove 11, at this time, the positioning ring groove 11 is in interference fit with the steel pipes 4 through the plugging sleeves 5, the two steel pipes 6 are fixed in the positioning ring groove 11 without moving, then, two pressing sleeves 21 are respectively sleeved on the sealing sleeves 3 correspondingly, then, two locking caps 22 are respectively screwed and a third step 32 is extruded until a first internal thread 23 is in threaded connection with a first external thread 12, at this time, the locking caps 22 are in interference fit with the steel pipes 6 through the sealing sleeves 3, and when the two locking caps 22 are screwed: the locking cap 22 with the third external thread 28 is screwed firstly, then the locking cap 22 with the second internal thread 29 is screwed, when the locking cap 22 with the second internal thread 29 is completely connected with the fixed through head 1, the second internal thread 29 is also completely in threaded connection with the third external thread 28, so that the connector is tightly connected with the two steel pipes 6, the connection between the two steel pipes 6 is tight, and the phenomenon of looseness or even shedding cannot occur for a long time, and the sealing sleeve 3, the inserting sleeve 5 and the fixed plug sleeve 4 are tightly extruded, so that the sealing effect between the connector and the steel pipes 6 is improved, the leakage of a transported medium is effectively prevented, and the practicability is good; simultaneously need not carry out any special design to the port of steel pipe 6, can tailor steel pipe 6 as required during the construction, the connector has higher flexibility, adaptation degree, also improves steel pipe 6's utilization ratio, also effectively solves current welding and has the problem of welding inefficiency, rosin joint or hourglass welding.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the specification describes embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and it will be understood by those skilled in the art that the specification as a whole and the embodiments may be combined as appropriate to form other embodiments as would be understood by those skilled in the art.

Claims

1. The utility model provides a steel pipe connector, its characterized in that, is including deciding logical head, the both ends symmetry of deciding logical head is provided with the locator slot, every all the cover is equipped with fixed plug bush on the inner peripheral surface of locator slot, the outer peripheral face symmetry of locator slot is provided with first external screw thread, every first external screw thread all corresponds there is the locking cap, every the inner peripheral surface of locking cap be provided with first external screw thread complex first internal thread, every the locking cap is still extruded on closely admittedly, closely admittedly set up the both sides at the locator slot.

2. The steel pipe joint according to claim 1, wherein each locking cap comprises a constant pressure sleeve and a locking cap which are arranged in a matched manner; the first internal thread is arranged on the inner peripheral surface of the locking cap, the first internal thread is always connected with the second external thread, the second external thread is arranged at one end, close to the fixed through head, of the outer peripheral surface of the fixed pressure sleeve, the outer peripheral surface of the fixed pressure sleeve is provided with a guide sliding groove, a guide sliding ring is arranged in the guide sliding groove in a matched mode, and the guide sliding ring is arranged at one end, far away from the fixed through head, of the inner peripheral surface of the locking cap.

3. A steel pipe joint according to claim 2, wherein one end of the outer peripheral surface of one locking cap away from the slip ring is provided with a terminal groove, the peripheral surface of the terminal groove is provided with a third external thread, one 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 matched with the third external thread.

4. The steel pipe joint according to claim 2, wherein the sealing sleeve is provided with a radial constriction radially penetrating the sealing sleeve.

5. The steel pipe joint according to claim 2, wherein the sealing sleeve is provided with a stepped structure; the sealing sleeve comprises a first step, a second step and a third step, the outer diameter of the first step, the second step and the third step are sequentially increased from one end close to the fixed through head to one end far away from the fixed through head, the inner circumferential surface of the fixed pressing sleeve is matched 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 a first suction groove arranged along the axis is formed in the inner circumferential surface of the third step.

6. The steel pipe joint according to claim 5, wherein the outer diameter of the third step increases from the end far away from the fixed through head to the end near the fixed through head.

7. The steel pipe connector as claimed in claim 4, wherein an insertion sleeve is disposed at an end of the sealing sleeve close to the through hole, the insertion sleeve is attached to an outer peripheral surface of the positioning ring groove, the radial closing-up extends through the insertion sleeve, and a stop ring pad is disposed at an end of an inner peripheral surface of the insertion sleeve away from the sealing sleeve.

8. The steel pipe joint according to claim 7, wherein the two side walls of the retainer ring pad are provided with concave suction ring grooves.

9. The steel pipe joint as claimed in claim 2, wherein the locking cap has a flared pushing opening at an end of the inner peripheral surface away from the slip ring, and the inner diameter of the pushing opening gradually increases from the end close to the slip ring to the end away from the slip ring.

10. The steel pipe connector according to claim 1, wherein the outer diameter of the fixed plug sleeve gradually increases from the end of the positioning ring groove to the inside of the positioning ring groove, and the outer peripheral surface of the fixed plug sleeve is provided with a second suction groove arranged along the axial center.