Pipeline quick coupler

Abstract

The utility model relates to a pipeline quick coupler which comprises a flow inlet pipe body and a flow outlet pipe body, and the output end of the flow inlet pipe body and the input end of the flow outlet pipe body are provided with a first quick coupler head and a second quick coupler head respectively, the first fast-assembly pipe head and the second fast-assembly pipe head are in butt joint in an inserted and sleeved mode to form a joint structure in a sealed connection communicating pipe cavity so as to communicate the inflow pipe body with the outflow pipe body. Coaxial butt joint and clamping tight connection between the second fast-assembly pipe head and the first fast-assembly pipe head are limited through inserting and centering pieces and alignment loosening and tightening screws which are arranged on the end side of a pipe body of the second fast-assembly pipe head in the annular direction at intervals respectively, and the inserting and centering pieces and the alignment loosening and tightening screws are arranged on the end side of the pipe body of the second fast-assembly pipe head in the annular direction. The pipeline quick coupler is good in sealing performance, assembly convenience can be improved in an alignment correction mode, and meanwhile tight connection extrusion strength can be adjusted and corrected.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline butt joint equipment, in particular to a pipeline quick-install joint. Background Art

[0002] Pipe fittings are connecting tools between pipes and are indispensable connecting accessories in the assembly and processing of pipelines. Commonly used pipe fittings can be generally divided into hard pipe fittings and hose fittings that can perform rigid and flexible connections according to their usage scenarios and connection methods. Among them, the rigid connection methods include flange connection, welding, compression connection, threaded connection, socket connection, groove connection, hot melt connection, electric fusion connection, etc. With the improvement of production and assembly efficiency and other requirements, the structure of pipe fittings has been further optimized and designed as a quick-install fitting structure that can improve assembly efficiency, so that the sealing connection of the pipe body can be completed quickly and accurately when assembling and connecting pipes.

[0003] Existing pipe joints usually adopt a threaded structure. When assembling and sealing, a long rotation operation is required to ensure the stability of the connection. In addition, due to the matching of the threaded joint, it takes a lot of effort to screw the interface into the docking seat, resulting in a long time for the alignment operation, which reduces the efficiency of the pipe joint assembly and sealing. In addition, if the interface is not screwed on the docking seat, the material transported in the pipe is very likely to flow out from the gap between the interface and the interface seat, thereby affecting the sealing of the interface after installation and the transportation efficiency. In addition, with repeated disassembly and assembly, the thread gap increases, and in the absence of a sealing structure, it is very easy to produce a connection gap and leakage. Utility Model Content

[0004] The utility model aims to provide a pipe quick-release joint which has good sealing performance and can improve the convenience of assembly by means of alignment correction, and can also adjust the tight-fitting extrusion strength to correct the problem that the existing quick-release pipe joints have poor docking accuracy and require a lot of time to perform docking corrections, and the existing quick-release docking structure has poor sealing effect and is very likely to cause leakage due to loose tight-fitting extrusion after multiple disassembly and assembly.

[0005] The technical solution adopted by the utility model is: a pipeline quick-release joint, comprising an inlet pipe body and an outlet pipe body, wherein the output end of the inlet pipe body and the input end of the outlet pipe body are respectively equipped with a first quick-release pipe head and a second quick-release pipe head capable of sealing butt joint, wherein the first quick-release pipe head and the second quick-release pipe head are connected to each other by inserting and butting to form a closely connected pipe cavity to form a joint structure so as to connect the inlet pipe body and the outlet pipe body, and the second quick-release pipe head is respectively limited to coaxial butt joint and clamping and close joint between itself and the first quick-release pipe head by inserting and centering pieces and aligning and tightening screws arranged circumferentially at intervals on the end side of the pipe body.

[0006] According to a preferred embodiment, a first docking ring groove is provided in the tube body port surface of the first quick-release tube head, and a first elastic sealing gasket is provided at the bottom of the groove cavity of the docking ring groove; and a plurality of limit grooves are provided at intervals in an annular direction on the tube body side wall of the first quick-release tube head.

[0007] According to a preferred embodiment, the multi-stage limiting slot includes an introduction slot cavity parallel to the axial direction of the tube body of the first quick-release tube head and an inclined positioning arc groove at an angle to the introduction slot cavity, and an expansion slot capable of correcting the docking position of the first quick-release tube head and the second quick-release tube head is provided on the axial opening side of the introduction slot cavity close to the tube body port surface of the first quick-release tube head.

[0008] According to a preferred embodiment, a second annular protrusion matching the first docking ring groove is provided in the tube body port surface of the second quick-release tube head, and an outer sleeve ring body capable of cooperating therewith to form a second docking ring groove is also provided radially outside the second annular protrusion.

[0009] According to a preferred embodiment, a second filling annular groove connected to the first elastic sealing gasket is arranged on the axial top surface of the second annular protrusion; and a second elastic sealing gasket is also arranged at the bottom of the groove cavity of the second docking annular groove.

[0010] According to a preferred embodiment, sliding grooves for slidingly installing guide sliders are circumferentially spaced apart on the inner ring wall of the outer ring body, and the surface of the guide slider facing the inner cavity of the outer ring body is supported by a positioning column that can adapt to the groove cavity of the multi-stage limit slot.

[0011] According to a preferred embodiment, an axial end surface of the outer collar body away from the tube body of the second quick-release tube head is also threadedly inserted with an alignment loosening screw capable of adjusting the relative working position of the guide slider in the slide groove.

[0012] According to a preferred embodiment, the plug-in centering member is a triangular plate that is circumferentially spaced and arranged on the axial end surface of the outer ring body in an offset manner relative to the aligning and tightening screw.

[0013] According to a preferred embodiment, a first filling annular groove corresponding to the second elastic sealing gasket is further provided on the tube body end surface of the first quick-release tube head located radially outward of the first docking annular groove.

[0014] According to a preferred embodiment, a positioning slot hole capable of limiting the position of the positioning column in the slot cavity of the inclined positioning slot is provided on the slot side wall of the inclined positioning slot close to the tube body end surface of the first quick-release tube head.

[0015] The beneficial effects of the utility model are:

[0016] The first quick-release tube head and the second quick-release tube head provided in the present application can quickly and accurately perform plug-in docking, thereby constructing a closed connecting tube cavity. The first quick-release tube head and the second quick-release tube head construct an undulating plug-in structure on the docking end face by means of a clamping sleeve limiter, thereby increasing the docking contact area while improving the tightness of the docking, and can also adjust the relative deflection angle and telescopic length of the clamping structure to adjust the mutual abutment and extrusion strength between the end faces during close connection, thereby ensuring the stability and effectiveness of the close connection, avoiding looseness and other problems under the impact of large flow, and can also compensate for the assembly error and assembly wear gap formed after multiple disassembly and assembly by adjusting the clamping structure, thereby ensuring the assembly close connection strength and stability during long-term use. The plug-in alignment piece provided in the present application can quickly assist in completing the calibration of the coaxial docking, thereby improving the accuracy and convenience of the plug-in docking, and can further realize the rapid alignment of the card sleeve plug-in structure through rotation adjustment to make the radial projection of the alignment and tightening screw coincide with the introduction groove cavity, so as to quickly complete the docking and limit the sealing of the docking gap, greatly improving the docking efficiency while improving the docking stability and accuracy, ensuring the effectiveness of the close connection, and can also adjustably compensate for the docking gap to avoid leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural schematic diagram of a preferred pipeline quick-release connector proposed by the utility model;

[0018] Figure 2 This is a structural schematic diagram of a preferred pipeline quick-release connector proposed by the utility model when the first quick-release pipe head and the second quick-release pipe head are connected;

[0019] Figure 3 It is a cross-sectional schematic diagram of a first quick-release pipe head of a preferred pipe quick-release connector proposed by the utility model;

[0020] Figure 4 It is a cross-sectional schematic diagram of a second quick-release pipe head of a preferred pipe quick-release connector proposed by the utility model;

[0021] Figure 5 It is a side schematic diagram of a first quick-release pipe head of a preferred pipe quick-release connector proposed by the utility model;

[0022] Figure 6 It is an enlarged structural schematic diagram of the A region of a preferred pipe quick-release connector proposed by the utility model.

[0023] Reference numerals list

[0024] 1: inlet pipe body; 2: outlet pipe body; 3: first quick-release pipe head; 4: second quick-release pipe head; 5: plug-in centering piece; 31: first docking ring groove; 32: first elastic sealing gasket; 33: multi-stage limiting groove; 34: first filling ring groove; 331: introduction groove cavity; 332: inclined arc groove; 333: expansion groove; 3321: positioning groove hole; 41: second annular protrusion; 42: second docking ring groove; 43: outer sleeve ring body; 44: second elastic sealing gasket; 45: guide slider; 46: positioning column; 47: alignment loosening screw; 411: second filling ring groove; 431: slide groove. DETAILED DESCRIPTION

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the utility model will be briefly introduced below in combination with the drawings and the descriptions of the embodiments or the prior art. Obviously, the following descriptions of the structures of the drawings are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] The technical solution provided by the present invention will be described in detail below by way of embodiments with reference to the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In some examples, some implementation methods are not described or are not described in detail because they belong to existing or conventional technologies.

[0027] In addition, the technical features recorded in this article, or the steps in all methods or processes disclosed, except for mutually exclusive features and / or steps, can also be combined in any suitable manner in one or more embodiments. For those skilled in the art, it is easy to understand that the steps or operation sequence of the methods related to the embodiments provided herein can also be changed. Any order in the drawings and embodiments is only for illustrative purposes and does not imply a requirement to follow a certain order unless it is explicitly stated that a certain order is required.

[0028] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, under reasonable circumstances (not constituting a self-contradiction), include direct and indirect connections (couplings).

[0029] The following is a detailed description with reference to the accompanying drawings.

[0030] Example 1

[0031] The present application provides a pipeline quick-release connector, which includes an inlet pipe body 1, an outlet pipe body 2, a first quick-release pipe head 3, a second quick-release pipe head 4 and a plug-in centering piece 5.

[0032] according to Figure 1-6 In a specific embodiment shown, the output end of the inlet pipe body 1 and the input end of the outlet pipe body 2 are respectively installed with a first quick-release pipe head 3 and a second quick-release pipe head 4 capable of sealing docking. The first quick-release pipe head 3 and the second quick-release pipe head 4 are connected to each other by plugging and sleeve-jointing to form a joint structure in a manner of forming a close-fitting connecting tube cavity to connect the inlet pipe body 1 and the outlet pipe body 2. The second quick-release pipe head 4 is respectively limited to coaxial docking and clamping and close fitting with the first quick-release pipe head 3 by plug-in centering pieces 5 and alignment tension screws 47 arranged circumferentially at intervals on the end side of the pipe body. The plug-in centering piece 5 can correct the deviation of the axes of the first quick-release pipe head 3 and the second quick-release pipe head 4 during the process of docking, so that the two are in a coaxial state, ensuring the accuracy of the plug-in docking. The alignment and tightening screw 47 can synchronously assist in correcting the axial deflection angle of the first quick-loading tube head 3 and the second quick-loading tube head 4, so that the matching positioning structure of the two can be accurately positioned and plugged, thereby effectively limiting the close connection state of the two, and ensuring the closed tube wall and axial conduction of the tube cavity constructed by docking. The first quick-loading tube head 3 and the second quick-loading tube head 4 provided in the present application can quickly and accurately perform plug-in docking, thereby constructing a closed connected tube cavity. The first quick-loading tube head 3 and the second quick-loading tube head 4 construct an undulating plug-in structure on the docking end face by means of a clamping sleeve limit, thereby increasing the docking contact area while improving the tightness of the docking, and can also adjust the relative deflection angle and telescopic length of the positioning structure to adjust the mutual abutment and extrusion strength between the end faces during the close connection, thereby ensuring the stability and effectiveness of the close connection, avoiding looseness and other problems in the case of large flow impact, and can also compensate for the assembly error and assembly wear gap formed after multiple disassembly and assembly by adjusting the positioning structure, thereby ensuring the assembly close connection strength and stability during long-term use. The plug-in centering piece 5 provided in the present application can quickly assist in completing the calibration of the coaxial docking, thereby improving the accuracy and convenience of the plug-in docking, and can further realize the rapid alignment of the card sleeve plug-in of the card structure through rotation adjustment to make the radial projection of the alignment tension screw 47 coincide with the introduction groove cavity 331, so as to quickly complete the docking and limit the sealing of the docking gap, greatly improving the docking efficiency while improving the docking stability and accuracy, ensuring the effectiveness of the close connection while also being able to adjustably compensate for the docking gap to avoid leakage.

[0033] Preferably, a first docking annular groove 31 is provided in the tube body end surface of the first quick-release tube head 3. Further preferably, a first elastic sealing gasket 32 ​​is also provided at the bottom of the groove cavity of the first docking annular groove 31. Preferably, a multi-stage limiting card groove 33 is also provided in an annular direction on the tube body side wall of the first quick-release tube head 3. Preferably, a first filling annular groove 34 corresponding to the second elastic sealing gasket 44 is also provided on the tube body end surface of the first quick-release tube head 3 on the radially outer side of the first docking annular groove 31. The first docking annular groove 31 provided in the present application can be docked with the second annular protrusion 41 in a matching manner, thereby increasing the docking area while ensuring the effectiveness of docking filling, and the first elastic sealing gasket 32 ​​provided at the bottom of the groove cavity can effectively block the docking gap, thereby ensuring the airtightness of the docking. The first filling annular groove 34 can also limit the docking position of the second elastic sealing gasket 44 at the same time, and use the second elastic sealing gasket 44 to fill its groove cavity and secondary block the docking gap, thereby ensuring the airtightness of the docking. The multi-stage limiting slot 33 provided in the present application can cooperate with the positioning column 46 to limit the relative position of the first quick-release tube head 3 and the second quick-release tube head 4, thereby ensuring the effectiveness of the positioning and enabling the two to maintain a docking state in which the cavity is connected.

[0034] Preferably, the multi-stage limiting slot 33 includes an introduction slot cavity 331 parallel to the axial direction of the tube body of the first quick-release tube head 3 and an inclined positioning arc slot 332 at an angle to the introduction slot cavity 331. Further preferably, an extended slot 333 capable of correcting the docking position of the first quick-release tube head 3 and the second quick-release tube head 4 is provided on the axial opening side of the introduction slot cavity 331 close to the tube body end surface of the first quick-release tube head 3, so that the positioning column 46 of the second quick-release tube head 4 can effectively and quickly slide into the multi-stage limiting slot 33. Preferably, a positioning slot hole 3321 capable of limiting the position of the positioning column 46 in the slot cavity of the inclined positioning arc slot 332 is provided on the slot side wall of the inclined positioning arc slot 332 close to the tube body end surface of the first quick-release tube head 3. Specifically, a plurality of positioning slot holes 3321 are continuously arranged on the slot side wall of the inclined positioning arc slot 332. The extended slot 333 provided in the present application can guide the correction positioning column 46 to quickly and accurately snap into the introduction slot cavity 331, thereby further moving into the inclined snap-in arc slot 332, and then using the positioning column 46 to limit the placement in different snap-in slot holes 3321 to achieve docking with different mutual extrusion strengths.

[0035] Preferably, a second annular protrusion 41 matching the first docking annular groove 31 is provided in the tube body port surface of the second quick-release tube head 4. Preferably, an outer sleeve ring body 43 capable of forming a second docking annular groove 42 in cooperation therewith is also provided on the radial outer side of the second annular protrusion 41. Specifically, when the first quick-release tube head 3 and the second quick-release tube head 4 are connected to each other, the outer sleeve ring body 43 is sleeved on the outer side of the first quick-release tube head 3 in such a manner that the contour of its inner ring cavity can match the outer contour of the tube body of the first quick-release tube head 3. Preferably, a second filling annular groove 411 matching the first elastic sealing gasket 32 ​​is provided on the axial top surface of the second annular protrusion 41. Preferably, a second elastic sealing gasket 44 is also provided at the bottom of the groove cavity of the second docking annular groove 42. Preferably, a sliding groove 431 for slidingly installing the guide slider 45 is circumferentially spaced apart on the inner ring wall of the outer sleeve ring body 43. Preferably, the surface of the guide slider 45 facing the inner cavity of the outer sleeve ring body 43 supports a positioning column 46 that can be adapted to the groove cavity of the multi-stage limit groove 33. Preferably, the axial end surface of the outer sleeve ring body 43 away from the tube body of the second quick-release tube head 4 is also threaded with an alignment tension screw 47 that can adjust the relative working position of the guide slider 45 in the slide groove 431. Specifically, the guide slider 45 is rotatably connected to the alignment tension screw 47. Preferably, the alignment tension screw 47 can also make the positioning column 46 accurately snap into the multi-stage limit groove 33 by roughly aligning its axial projection with the introduction groove cavity 331 when the first quick-release tube head 3 and the second quick-release tube head 4 are connected, so as to improve the accuracy and convenience of the snap connection, thereby efficiently completing the alignment sleeve. The positioning column 46 provided in the present application can undergo axial translation in the slide groove 431 under the adjustment of the alignment and tensioning screw 47, so as to facilitate the adjustment of the relative position between the positioning column 46 and the tube body of the second quick-release tube head 4 according to needs, so as to adjust the limited insertion depth during the docking process, so as to obtain docking with different extrusion strengths, and the alignment and tensioning screw 47 can also adjust the position of the positioning column 46 to contact the state of the locking position limit, so that the docking and extrusion of the first quick-release tube head 3 and the second quick-release tube head 4 are released, so as to facilitate the disassembly operation.

[0036] Preferably, the plug-in centering member 5 is a triangular plate that is circumferentially spaced and staggered with the alignment loosening screw 47 on the axial end face of the outer collar body 43. Preferably, the plate body of the triangular plate coincides with the plane defined by the axial and radial directions of the outer collar body 43. The triangular plate can guide the first quick-release tube head 3 to be inserted into the outer collar body 43 in a coaxial manner, thereby improving the efficiency and accuracy of the centering plug-in.

[0037] The working principle of this application is:

[0038] When docking is required, the alignment tension screw 47 is rotated to make the positioning column 46 slide in the slide groove 431 and select a suitable relative position to ensure the docking overlap length of the first quick-loading tube head 3 and the second quick-loading tube head 4. When the first quick-loading tube head 3 and the second quick-loading tube head 4 are docked, the first quick-loading tube head 3 and the second quick-loading tube head 4 are close to each other. The plug-in centering piece 5 can correct the position of the first quick-loading tube head 3 so that the first quick-loading tube head 3 can be quickly and accurately inserted into the outer ring body 43, so that the first quick-loading tube head 3 and the second quick-loading tube head 4 form a coaxial state. At the same time, the plug-in centering piece 5 corrects the radial deviation of the first quick-loading tube head 3 and the second quick-loading tube head 4. The operator observes whether the alignment tension screw 47 is in the guide groove cavity 3. 31 is radially just above (radial refers to the diameter direction of the tube body of the tube head), so that by rotating the first quick-release tube head and / or the second quick-release tube head 4, the projection of the introduction groove cavity 331 is exactly in the introduction groove cavity 331, thereby realizing the adjustment of the deflection angle between the first quick-release tube head 3 and the second quick-release tube head 4, so that the two can realize coaxial docking quickly and effectively, and can also synchronously complete the rapid clamping connection of the clamping structure, so that when the two realize effective end-face extrusion close-cavity docking, the clamping structure jointly defined by the two can effectively define the close-cavity docking state.

[0039] When the same plug-in limit cannot guarantee the docking and extrusion strength of the first quick-loading tube head 3 and the second quick-loading tube head 4 during repeated disassembly and assembly, the second quick-loading tube head 4 can be further rotated clockwise to increase the length of the plug-in sleeves of the two and improve the docking and extrusion strength. When the unit feed amount is too large, the positioning column 46 can be axially translated by screwing the alignment tension screw 47 to adjust its preset clamping limit length, thereby adjusting the docking and extrusion strength between the first quick-loading tube head 3 and the second quick-loading tube head 4. The alignment tension screw 47 can also release the clamping state of the positioning column 46 in the clamping slot 3321 by screwing when a disassembly operation is required, so as to facilitate the quick completion of the disassembly operation.

[0040] The present utility model is not limited to the above optional implementation modes. Anyone can derive other various forms of products under the inspiration of the present utility model. However, no matter what changes are made in the shape or structure, all technical solutions that fall within the scope of the claims of the present utility model fall within the protection scope of the present utility model. Those skilled in the art should understand that the present utility model specification and its drawings are illustrative and do not constitute limitations on the claims. The protection scope of the present utility model is defined by the claims and their equivalents. Throughout the text, the features guided by "preferably" are only an optional method and should not be understood as having to be set. Therefore, the applicant reserves the right to abandon or delete the relevant preferred features at any time.

Claims

1. A pipeline quick-release connector, comprising an inlet pipe body (1) and an outlet pipe body (2), characterized in that: The output end of the inlet pipe body (1) and the input end of the outlet pipe body (2) are respectively provided with a first quick-fit pipe head (3) and a second quick-fit pipe head (4) capable of sealing and docking. The first quick-release pipe head (3) and the second quick-release pipe head (4) are connected to each other by inserting and sleeve-jointing to form a joint structure in a manner of forming a closely connected pipe cavity, so as to connect the inlet pipe body (1) and the outlet pipe body (2). The second quick-release tube head (4) is respectively limited to coaxial docking and locking tight connection with the first quick-release tube head (3) by means of plug-in centering pieces (5) and alignment loosening screws (47) arranged circumferentially at intervals on the end side of the tube body.

2. The pipe quick connector according to claim 1, characterized in that: A first butt joint ring groove (31) is provided in the pipe body end surface of the first quick-release pipe head (3), and a first elastic sealing gasket (32) is also provided at the bottom of the groove cavity of the first butt joint ring groove (31); A plurality of limiting slots (33) are also provided at intervals in an annular direction on the side wall of the tube body of the first quick-release tube head (3).

3. The pipe quick connector according to claim 2, characterized in that: The multi-stage limiting clamping groove (33) comprises an introduction groove cavity (331) parallel to the tube body axial direction of the first quick-release tube head (3) and an inclined clamping arc groove (332) forming an angle with the introduction groove cavity (331). An expansion notch (333) capable of correcting the docking position of the first quick-release tube head (3) and the second quick-release tube head (4) is provided on the axial opening side of the introduction groove cavity (331) close to the tube body end surface of the first quick-release tube head (3).

4. The pipe quick connector according to claim 3, characterized in that: A second annular protrusion (41) matching the first butt-jointed annular groove (31) is provided in the pipe body end surface of the second quick-release pipe head (4), and a second annular protrusion (41) that can cooperate with the first butt-jointed annular groove (31) is also provided on the radial outer side of the second annular protrusion (41) to form a The outer sleeve ring body (43) of the second butt-jointed ring groove (42).

5. The pipe quick connector according to claim 4, characterized in that: A second filling annular groove (411) for contacting the first elastic sealing gasket (32) is provided on the axial top surface of the second annular protrusion (41); A second elastic sealing gasket (44) is also arranged at the bottom of the groove cavity of the second butt-jointed ring groove (42).

6. The pipe quick connector according to claim 5, characterized in that: Slide grooves (431) for slidably mounting guide sliders (45) are provided at intervals in the annular direction on the inner annular wall of the outer ring body (43). The surface of the guide sliding block (45) facing the inner cavity of the outer ring body (43) supports a positioning column (46) that can be matched with the groove cavity of the multi-stage limiting groove (33).

7. The pipe quick connector according to claim 6, characterized in that: An axial end surface of the outer ring body (43) away from the tube body of the second quick-release tube head (4) is also threadedly inserted with an alignment loosening screw (47) capable of adjusting the relative working position of the guide slider (45) in the slide groove (431).

8. The pipe quick connector according to claim 7, characterized in that: The plug-in centering member (5) is a triangular plate that is circumferentially spaced and staggered with the alignment loosening screw (47) on the axial end surface of the outer ring body (43).

9. The pipe quick connector according to claim 8, characterized in that: A first filling annular groove (34) corresponding to the second elastic sealing gasket (44) is also provided on the tube body end surface of the first quick-release tube head (3) located radially outside the first docking annular groove (31).

10. The pipe quick connector according to claim 9, characterized in that: A positioning slot hole (3321) capable of limiting the position of the positioning column (46) in the slot cavity of the inclined positioning slot (332) is provided on the slot side wall of the inclined positioning slot (332) close to the tube body end surface of the first quick-release tube head (3).

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