Rapidly detachable target connection structure and method for BNCT

Abstract

The present invention relates to the technical field of nuclear medicine radiotherapy. Specifically, it discloses a rapid detachable target connection structure and method for BNCT, which at least includes a target segment, a pipe segment, and a locking device for connecting the target segment and the pipe segment. The locking device at least includes a lock body, a lock lever, and a drive mechanism. The rapid detachable target connection structure and method for BNCT of the present invention can realize rapid connection and rapid removal between the target segment and the pipe segment by axially extending and retracting the lock lever by the drive mechanism. The operation is simple, the detachable efficiency is high, which improves the convenience of replacing the target segment in the BNCT system and maintaining the vacuum system. In addition, based on the position change of the slider, locking and unlocking are realized by the axial extension and retraction movement of the lock lever. The structure is simple, the concept is ingenious, and the conventional locking and unlocking methods are changed.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear medicine radiotherapy, and specifically to a quickly detachable target connection structure and method for BNCT.

Background Art

[0002] Through long-term development, the application of nuclear technology in the medical field has made great progress, and nuclear medicine imaging examinations and various radiotherapy means have already become an indispensable part of modern medicine. Boron Neutron Capture Therapy (BNCT) based on a small accelerator is a new treatment means for cancer progression in recent years.

[0003] An accelerator neutron source is an important device for generating neutrons required for treatment, and it mainly includes three main parts: an ion source, a vacuum acceleration system, and an induction focus system. The vacuum system is an important component of the accelerator and is composed of a vacuum pipe and a vacuum pump. Since the vacuum degree inside the pipe directly determines the quality of the beam, the connection of the vacuum pipe is an important issue.

[0004] For the connection between the existing target segment and the vacuum pipe, the vacuum flange method is often adopted, which is fixed by bolts and nuts, and the liner between the flange end faces is extruded to play a sealing role. In the docking process of the vacuum pipe, this method requires manually tightening a relatively large number of bolts one by one, which is time-consuming for the whole process. Moreover, when encountering a certain environment, such as a radiation-containing space and a narrow space, it is inconvenient to directly operate manually, which brings great difficulties to the replacement of the target segment and the maintenance of the vacuum system.

Summary of the Invention

Problems to be Solved by the Invention

[0005] The technical problem to be solved by the present invention is to solve the technical defect that in the prior art, since the target segment and the vacuum pipe are fixed and connected by bolts and nuts, the operation is inconvenient, and it is difficult to replace the target segment and maintain the vacuum system.

Means for Solving the Problem

[0006] In order to solve the above technical problem, the technical solution according to the present invention is as follows. A quick-removable target connection structure for BNCT, including a target segment, a pipe segment, and a locking device for connecting the target segment and the pipe segment, wherein the locking device a lock body in which a lock pin that can elastically expand and contract along the radial direction is installed, a lock groove for accommodating the lock pin to penetrate along the radial direction is installed, a slider is slidably connected along the axial direction in the lock groove, and a first guide surface and a second guide surface that intersect at the maximum outer diameter of the slider are respectively installed at both ends of the slider. A receiving groove adapted to the first guide surface is installed on one side of the lock lever of the lock groove close to the free end, and a second guide portion is installed at the free end of the lock lever. including a drive mechanism for axially expanding and contracting the lock lever with respect to the lock body and providing a continuous tensile force in the locked state. The drive mechanism and the lock body are respectively fixedly installed on the target segment and the pipe segment. One end of the lock lever is fixedly connected to the drive mechanism, the other end of the lock lever is the free end, and a receiving groove adapted to the first guide surface is installed on one side of the lock lever of the lock groove close to the free end, and a second guide portion is installed at the free end of the lock lever.

[0007] In a preferred embodiment, a lock hole for accommodating the lock lever to axially penetrate is provided in the lock body, and at least one lock pin is installed along the circumferential direction on the inner wall of the lock hole.

[0008] In a preferred embodiment, the lock body includes an inner sleeve and an outer sleeve which are nested with each other, the lock hole is installed on the inner sleeve, and an installation part for attaching the lock pin is installed on the inner sleeve.

[0009] In a preferred embodiment, the installation part includes a countersunk groove installed on the outer wall of the inner sleeve and a pin hole radially penetrating from the countersunk groove to the lock hole, and a boss adapted to the countersunk groove is installed at the rear end of the lock pin.

[0010] In a preferred embodiment, an elastic member is installed between the boss and the inner wall of the outer sleeve.

[0011] In a preferred embodiment, a lock head including an end head part, a lock groove segment, and a lock-up segment in sequence is installed at the free end of the lock lever, and the lock groove is located on the lock groove segment.

[0012] In a preferred embodiment, an inclined transition part is installed at one end of the lock-up segment close to the lock groove segment.

[0013] In a preferred embodiment, the slider is fitted on the lock groove segment.

[0014] In a preferred embodiment, the drive mechanism includes, but is not limited to, a linear motor, a hydraulic cylinder, and a pneumatic cylinder.

[0015] In a preferred embodiment, the first guide surface and the second guide surface are a tapered surface or an arc surface.

[0016] In a preferred embodiment, a first guide portion is provided at the free end of the lock pin.

[0017] In a preferred embodiment, a tapered surface or an arc surface is provided on the first guide portion and / or the second guide portion.

[0018] The present invention further provides a method for attaching and detaching the quickly detachable target connection structure for BNCT, and the method includes at least the following steps: Step 10: A locking step, and the locking step includes the following: Step 11: Align the lock lever with the lock body. Step 12: The drive mechanism moves the lock lever forward until the lock pin enters the lock groove, and the drive mechanism continuously pulls the lock lever backward to lock, locking the target segment and the pipe segment. Step 20: An unlocking step, and the unlocking step includes the following: Step 21: The drive mechanism moves the lock lever forward until the lock pin passes over the slider through the first guide surface and enters the lock groove behind the slider. Step 22: The drive mechanism moves the lock lever backward, the lock pin acts on the second guide surface of the slider, slides the slider forward until the first guide surface enters the accommodation groove, then the lock pin disengages from the lock groove through the second guide surface, the lock lever disengages from the lock body, and the connection state between the target segment and the pipe segment is released.

Advantages of the Invention

[0019] The quickly detachable target connection structure and method for BNCT of the present invention have the following beneficial effects compared with the prior art.

[0020] (1) By axially expanding and contracting the locking lever by a driving mechanism, rapid connection and rapid removal between the target segment and the pipe segment can be realized, the operation is simple, the attachment and detachment efficiency is high, and the replacement of the target segment in the BNCT system and the convenience of maintenance of the vacuum system are improved.

[0021] (2) Based on the position change of the slider, locking and unlocking are realized by the axial expansion and contraction movement of the locking lever, the structure is simple, the concept is ingenious, and the conventional locking and unlocking methods are changed.

[0022] (3) After locking, a pulling force is applied by the driving mechanism to make the connection between the target segment and the pipe segment more tightly and reliably.

Brief Description of the Drawings

[0023]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Embodiments for Carrying Out the Invention

[0024] To make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described in more detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described in this specification are only used to explain the present invention and are not used to limit the present invention.

[0025] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "front", "rear", "inner", "outer", etc. is the orientation or positional relationship shown based on the drawings, and is only for the purpose of easily explaining and simplifying the present invention, and does not indicate or imply that the mentioned device or element must have a specific orientation and be constructed and operated in a specific orientation. Therefore, it should not be understood as limiting the present invention.

[0026] In the description of the present invention, it should be noted that unless otherwise clearly defined or limited, the terms "mounted", "connected", and "connected" should be understood broadly. For example, it may be connected so as to be fixed, integrally connected, detachably connected, may be a communication inside two elements, may be directly connected, or may be indirectly connected by an intermediate member. Those skilled in the art can specifically understand the specific meaning of the above terms in the present invention.

[0027] The quick-detachable target connection structure for BNCT according to this embodiment includes a target segment 20, a piping segment 30, and a plurality of locking devices 10 for connecting the target segment 20 and the piping segment 30, as shown in FIGS. 1 and 2. Here, the target segment 20 includes a sleeve 21 and a target body 22 located at one end of the sleeve. A first flange 23 is installed at one end of the sleeve 21 that abuts against the piping segment 30. Correspondingly, a second flange 31 that abuts against the first flange 23 is installed at one end of the piping segment 30 that abuts against the target segment 20. Here, a sealing member (not shown) is installed between the first flange 23 and the second flange 31.

[0028] As a special feature of this embodiment, as shown in FIGS. 1 to 3 and FIG. 6 here, the locking device includes a lock body 11, a lock lever 12, and a drive mechanism 13.

[0029] Here, as shown in FIG. 3, the structure of the lock body 11 includes an inner sleeve 112 and an outer sleeve 111 that are nested with each other. Here, an attachment hole 111 for accommodating the inner sleeve 112 is installed in the outer sleeve 111 1 is installed, and preferably, the inner sleeve is press-fitted into the attachment hole 111 1

[0030] In this embodiment, a locking hole 1121 that penetrates axially is installed in the inner sleeve 112, and four attachment parts for attaching a locking pin 113 are further installed along the circumferential direction of the inner sleeve 112. Preferably, in this embodiment, the attachment part includes a countersunk groove 1122 installed on the outer wall of the inner sleeve and a pin hole 1123 that penetrates radially from the countersunk groove to the locking hole 1121.

[0031] Correspondingly, in this embodiment, a boss 1132 that fits the countersunk groove 1122 is installed at the rear end of the locking pin 113, and the locking pin 1 ​31 is inserted from the countersink groove 1122 into the pin hole 1123 and protrudes radially from the inner wall of the lock hole 1121. Here, the lock pin is radially movable within the pin hole.

[0032] In this embodiment, between the boss 1132 and the inner wall of the mounting hole 111 1 an elastic member 114 that provides an elastic force for elastic expansion and contraction to the lock pin is installed. Preferably, the elastic member 114 is a compression spring.

[0033] Preferably, in this embodiment, a spring storage groove 1133 for accommodating a compression spring is further installed at one end of the boss 1132 away from the lock pin 113.

[0034] In this embodiment, a first guide portion 1131 with a tapered surface or an arc surface is installed at the free end of the lock pin 113.

[0035] As shown in FIGS. 4 and 5, the lock lever 12 of this embodiment includes a lever main body 121 and a lock head located at an end of the lever main body for fitting into the lock hole 1121. Here, one end of the lever main body 121 away from the lock head is connected to the drive mechanism 13, and the drive mechanism 13 axially moves the lock lever 12 relative to the lock body 11. It should be noted that the drive mechanism 13 may be selected from existing linear drive mechanisms including, but not limited to, linear motors, hydraulic cylinders, and pneumatic cylinders.

[0036] In this embodiment, the lock head includes a lock groove segment 122, an end head portion 123 located at one end of the lock groove segment, and a lock-up segment 124 located at the other end of the lock groove segment. Here, a lock groove 127 for accommodating the lock pin 113 to protrude along the radial direction is installed in the lock groove segment 124.

[0037] In this embodiment, the outer diameters of the end head portion 123 and the lock-up segment 124 are larger than the outer diameter of the lock groove segment 122, whereby a lock groove is formed on the lock groove segment. It should be noted that in this embodiment, the lever body 121 and the lock-up segment 124 have a different-diameter structure. Of course, the two may also have an integrated structure with the same diameter.

[0038] In this embodiment, at the free end of the end head portion 123, a second guide portion is provided for guiding and fitting with the first guide portion 1131 of the lock pin 113, and the second guide portion is a tapered surface or an arc surface.

[0039] As a special feature of this embodiment, as shown in FIGS. 6 and 7, here, a slider 14 is further fitted into the lock groove segment 122. The slider 14 has an axially penetrating hole 143, and the axially penetrating hole 143 is loosely fitted into the lock groove segment 122, slidably connected to the lock groove segment in the axial direction, and movable in the axial direction with respect to the lock groove segment 122.

[0040] In this embodiment, as shown in FIG. 8, in the locked state, the lock pin 113 is located in the lock groove 127 between the end head portion 123 and the slider 14. As shown in FIGS. 9 and 10, in the unlocked state, the lock pin 113 is located in the lock groove 127 between the slider 14 and the lock-up segment 124.

[0041] In this embodiment, a guide surface for guiding and fitting with the first guide portion 1131 of the lock pin 113 is provided on the slider 14. As shown in FIG. 7, the guide surface includes a first guide surface 141 close to one side of the end head portion 123 and a second guide surface 142 close to one side of the lock-up segment 124. Here, the first guide surface 141 and the second guide surface 142 are tapered surfaces or arc surfaces.

[0042] Preferably, in the present embodiment, the first guide surface 141 and the second guide surface 142 intersect at the maximum outer diameter of the slider 14. After being installed in this way, the lock pin can more easily cross the slider.

[0043] In the present embodiment, as shown in FIGS. 4 and 5, a receiving groove 125 for receiving the first guide surface 141 is provided on one side of the end head portion 123 close to the lock groove segment 122. The purpose of installing in this way is that, as shown in FIGS. 9 and 10, in the unlocking process, when the slider 14 is located between the lock pin and the end head portion, as the lock lever moves backward, the first guide surface 141 enters the receiving groove 125, avoiding the lock pin from entering between the slider and the end head portion again, and ensuring the reliability of the unlocking process.

[0044] Preferably, in the present embodiment, as shown in FIGS. 4 to 6, an inclined transition portion 126 is provided at one end of the lock-up segment 124 close to the lock groove segment 122. As shown in FIG. 9, in the unlocking process, after the lock pin crosses the slider, a larger space for the lock pin to enter the lock groove is provided.

[0045] In the present embodiment, the lock body 11 is fixedly installed on the target segment 20, and the drive mechanism 13 is fixedly installed on the pipe segment 30. Similarly, the lock body 11 may be installed on the pipe segment 30, and correspondingly, the drive mechanism 13 may be installed on the target segment 20.

[0046] In the present embodiment, the method for attaching and detaching the quickly detachable target connection structure for BNCT includes the following steps. Step 10: The locking step, and the locking step includes the following. Step 11: Align the lock lever with the lock body. Step 12: The drive mechanism moves the lock lever forward until the lock head enters the lock hole. Here, the slider is close to one side of the lock-up segment, and the second guide portion of the lock head acts on the first guide portion of the lock pin to move the lock pin radially outward. After the end head portion of the lock head exceeds the lock pin, due to the reset action of the elastic member, the lock pin enters the lock groove. As shown in FIG. 8, in this state, the lock pin is located in the lock groove between the end head portion and the slider.

[0047] Next, the drive mechanism moves the lock lever backward, continuously pulls the lock lever backward to lock, and locks the target segment and the pipe segment.

[0048] In this embodiment, based on the pulling force of the drive mechanism, the connection between the target segment and the pipe segment becomes more tightly and reliably. In particular, a sealing member is installed between the first flange and the second flange, and based on the continuous action of the pulling force, the sealing becomes more reliable.

[0049] Step 20: It is an unlocking step, and the unlocking step includes the following.

[0050] Step 21: The drive mechanism moves the lock lever forward, and the first guide surface of the slider acts on the first guide portion of the lock pin to move the lock pin radially outward until the slider exceeds the lock pin. Due to the reset action of the elastic member, as shown in FIG. 9, the lock pin enters the lock groove behind the slider. In this state, the lock pin is located in the lock groove between the slider and the lock-up segment.

[0051] Step 22: The drive mechanism moves the lock lever rearward, and the lock pin acts on the second guide surface of the slider, and axially moves the slider to one side of the end head portion as shown in FIG. 10 until the first guide surface of the slider enters the accommodation groove. The drive mechanism continuously moves the lock lever rearward, and the second guide surface of the slider acts on the first guide portion of the lock pin, radially moving the lock pin outward, the lock pin disengages from the lock groove, and after the slider and the end head portion sequentially cross the lock pin, the lock head disengages from the lock hole and the lock lever disengages from the lock body, thereby releasing the connection state between the target segment and the pipe segment.

[0052] In this embodiment, the connection between the target segment and the pipe segment is realized by the locking device, and rapid connection and rapid removal can be realized based on program control, solving the problems of time-consuming and cumbersome operation in the conventional connection method. It improves the convenience of replacing the target segment and maintaining the vacuum system in the BNCT system.

[0053] In short, the above-described embodiments are merely better embodiments of the present invention and do not limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall all be included within the protection scope of the present invention.

[0054] (Appendix) (Appendix 1) A quickly detachable target connection structure for BNCT including a target segment, a pipe segment, and a locking device for connecting the target segment and the pipe segment, wherein the locking device includes a lock body in which a lock pin that can elastically expand and contract along the radial direction is installed, A lock groove for accommodating the lock pin to penetrate along the radial direction is provided, a slider is slidably connected along the axial direction in the lock groove, and at both ends of the slider, a lock lever is installed with a first guide surface and a second guide surface respectively intersecting at the maximum outer diameter of the slider, including a drive mechanism for axially expanding and contracting the lock lever with respect to the lock body and providing a continuous tensile force in the locked state. The drive mechanism and the lock body are respectively fixedly installed on the target segment and the pipe segment. One end of the lock lever is fixedly connected to the drive mechanism, the other end of the lock lever is a free end, and a receiving groove adapted to the first guide surface is provided on one side of the lock groove close to the free end of the lock lever, and a second guide portion is provided at the free end of the lock lever. A quick-detachable target connection structure for BNCT, characterized by the above.

[0055] (Appendix 2) The lock body is provided with a lock hole for accommodating the lock lever to penetrate along the axial direction, and at least one of the lock pins is installed on the inner wall of the lock hole along the circumferential direction. The target connection structure according to Appendix 1, characterized by the above.

[0056] (Appendix 3) The lock body includes an inner sleeve and an outer sleeve that are nested with each other. The lock hole is installed on the inner sleeve, and an attachment portion for attaching the lock pin is installed on the inner sleeve. The target connection structure according to Appendix 2, characterized by the above.

[0057] (Appendix 4) The attachment portion includes a countersunk groove installed on the outer wall of the inner sleeve and a pin hole that penetrates radially from the countersunk groove to the lock hole. A boss adapted to the countersunk groove is installed at the rear end of the lock pin. The target connection structure according to Appendix 3, characterized by the above.

[0058] (Appendix 5) An elastic member is installed between the boss and the inner wall of the outer sleeve. The target connection structure according to Appendix 4, characterized in that.

[0059] (Appendix 6) A lock head including an end head portion, a lock groove segment, and a lock-up segment in sequence is installed at the free end of the lock lever, and the lock groove is located on the lock groove segment. The target connection structure according to Appendix 1, characterized in that.

[0060] (Appendix 7) An inclined transition portion is installed at one end of the lock-up segment close to the lock groove segment. The target connection structure according to Appendix 6, characterized in that.

[0061] (Appendix 8) The slider is fitted on the lock groove segment. The target connection structure according to Appendix 6, characterized in that.

[0062] (Appendix 9) The drive mechanism includes a linear motor, a hydraulic cylinder or a pneumatic cylinder. The target connection structure according to Appendix 1, characterized in that.

[0063] (Appendix 10) The first guide surface and the second guide surface are tapered surfaces or arc surfaces. The target connection structure according to Appendix 1, characterized in that.

[0064] (Appendix 11) A first guide portion is installed at the free end of the lock pin. The target connection structure according to any one of Appendices 1 to 10, characterized in that.

[0065] (Appendix 12) A tapered surface or an arcuate surface is provided on the first guide portion and / or the second guide portion. The target connection structure according to appended claim 11, characterized in that.

[0066] (Appended claim 13) A method for attaching and detaching a rapidly detachable target connection structure for BNCT according to any one of appended claims 1 to 12, the method comprising at least the following steps: Step 10: A lock step, the lock step comprising the following: Step 11: Align the lock lever with the lock body. Step 12: The drive mechanism moves the lock lever forward until the lock pin enters the lock groove, and the drive mechanism continuously pulls the lock lever backward to lock, locking the target segment and the pipe segment. Step 20: An unlock step, the unlock step comprising the following: Step 21: The drive mechanism moves the lock lever forward until the lock pin passes over the slider via the first guide surface and enters the lock groove behind the slider. Step 22: The drive mechanism moves the lock lever backward, the lock pin acts on the second guide surface of the slider, slides the slider forward until the first guide surface enters the receiving groove, then the lock pin disengages from the lock groove via the second guide surface, the lock lever disengages from the lock body, and the connection state between the target segment and the pipe segment is released.

Explanation of reference numerals

[0067] 10 Locking device 11 Lock body 111 Outer sleeve 1111 Mounting hole 112 Inner sleeve 1121 Lock hole 1122 Counterbore groove 1123 Pin hole 113 Lock pin 1131 Guide part 1132 Boss 1133 Storage groove 12 Lock lever 121 Lever body 122 Lock groove segment 123 End head part 124 Lock-up segment 127 Lock groove 13 Driving mechanism 14 Slider 141 First guide surface 142 Second guide surface 143 Through hole 20 Target segment 21 Sleeve 22 Target body 23 First flange 30 Pipe segment 31 Second flange

Claims

1. A quickly detachable target connection structure for BNCT, comprising a target segment, a pipe segment, and a locking device for connecting the target segment and the pipe segment, wherein the locking device includes a lock body in which a locking pin that can elastically expand and contract along the radial direction is installed, a lock groove for accommodating the locking pin to penetrate along the radial direction is installed, a slider is slidably connected along the axial direction in the lock groove, and at both ends of the slider, a first guide surface and a second guide surface that intersect at the maximum outer diameter of the slider are respectively installed on a lock lever, a drive mechanism for axially expanding and contracting the lock lever with respect to the lock body and providing a continuous tensile force in the locked state, the drive mechanism and the lock body are respectively fixedly installed on the target segment and the pipe segment, one end of the lock lever is fixedly connected to the drive mechanism, the other end of the lock lever is a free end, and a receiving groove adapted to the first guide surface is installed on one side of the lock groove close to the free end of the lock lever, and a second guide portion is installed at the free end of the lock lever, A quickly detachable target connection structure for BNCT, characterized in that.

2. The lock body is provided with a lock hole for accommodating the lock lever to penetrate along the axial direction, and at least one of the locking pins is installed on the inner wall of the lock hole along the circumferential direction. The target connection structure according to claim 1, characterized in that.

3. The lock body includes an inner sleeve and an outer sleeve that are nested with each other, the lock hole is installed on the inner sleeve, and an attachment portion for attaching the locking pin is installed on the inner sleeve. The target connection structure according to claim 2, characterized in that.

4. The attachment portion includes a countersink groove installed on the outer wall of the inner sleeve and a pin hole that radially penetrates from the countersink groove to the lock hole, and a boss adapted to the countersink groove is installed at the rear end of the locking pin. The target connection structure according to claim 3, characterized in that.

5. An elastic member is installed between the boss and the inner wall of the outer sleeve. The target connection structure according to claim 4, characterized in that.

6. At the free end of the lock lever, a lock head is installed, which sequentially includes an end head portion, a lock groove segment, and a lock-up segment. The lock groove is located on the lock groove segment. The target connection structure according to claim 1, characterized in that.

7. An inclined transition portion is installed at one end of the lock-up segment close to the lock groove segment. The target connection structure according to claim 6, characterized in that.

8. The slider is fitted on the lock groove segment. The target connection structure according to claim 6, characterized in that.

9. The drive mechanism includes a linear motor, a hydraulic cylinder, or a pneumatic cylinder. The target connection structure according to claim 1, characterized in that.

10. The first guide surface and the second guide surface are tapered surfaces or arc surfaces. The target connection structure according to claim 1, characterized in that.

11. A first guide portion is installed at the free end of the lock pin. The target connection structure according to any one of claims 1 to 10, characterized in that.

12. A tapered surface or an arc surface is installed on the first guide portion and / or the second guide portion. The target connection structure according to claim 11, characterized in that.

13. A method for attaching and detaching a quickly detachable target connection structure for BNCT according to any one of claims 1 to 10, the method including at least the following steps. Step 10: A lock step, and the lock step includes the following. Step 11: Align the lock lever with the lock body. Step 12: The drive mechanism moves the lock lever forward until the lock pin enters the lock groove, and the drive mechanism continuously pulls the lock lever backward to lock, locking the target segment and the pipe segment. Step 20: An unlock step, and the unlock step includes the following. Step 21: The drive mechanism moves the lock lever forward until the lock pin passes through the slider via the first guide surface and enters the lock groove behind the slider. Step 22: The drive mechanism moves the lock lever rearward, and the lock pin acts on the second guide surface of the slider to slide the slider forward until the first guide surface enters the accommodation groove. Then, the lock pin disengages from the lock groove through the second guide surface, the lock lever disengages from the lock body, and the connection state between the target segment and the pipe segment is released.

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