A tunnel inside superimposed small loop transient electromagnetic method coil skeleton device

Abstract

The present application belongs to the technical field of induction detection equipment, and proposes a tunnel inside superimposed small loop transient electromagnetic method coil skeleton device, which comprises eight skeleton units connected in sequence, each skeleton unit comprising a rod body, an end universal joint and a transition universal joint, the rod body being provided with a skirt plate in the shape of a trumpet near its end, the skirt plate being provided with a perforation for wiring, and the outer side of adjacent skeleton units being provided with a shaping unit with a C-shaped clamping hole. The eight skeleton units connected in sequence can be expanded and contracted synchronously, the skeleton units and the shaping units in the contracted state are convenient to carry, the skeleton units and the shaping units in the expanded state can form a relatively stable square skeleton system, which is conducive to ensuring the accuracy of the induction signal, the skirt plate on the rod body provides a constraint node for the winding of the coil on the square skeleton system, the connection is free of adhesive tape, the stability is high, the tunnel site construction time is saved, and the device is suitable for large-scale promotion.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of induction detection equipment, and particularly relates to a coil framework device for a tunnel in-loop small loop transient electromagnetic method. BACKGROUND

[0002] The theoretical basis of the transient electromagnetic method is the electromagnetic induction law. Through a non-grounded loop or a grounded long conductor, a bipolar pulse current is supplied. When the stable current in the loop is suddenly cut off, the sudden change of the current in the transmitting loop will generate a primary magnetic field around it. In the propagation process of the primary magnetic field, if a good conductive geological body is encountered, an induced current, i.e., eddy current or secondary current, will be generated in the interior of the geological body. Due to the nonlinearity of the conductive geological body, after the primary magnetic field disappears, the eddy current does not immediately disappear, but has a transient process, the speed of which is related to the electrical parameters, volume scale, buried depth of the conductor, and the form and frequency of the transmitted current. This eddy current transient process will form a corresponding transient magnetic field, i.e., a secondary magnetic field, in space. By measuring the spatial distribution form of the secondary field through a receiving coil, the existence of an abnormal geological body underground can be found, and the electrical structure and spatial distribution form of the abnormal body can be determined.

[0003] For geophysical prospecting in a tunnel, the transient electromagnetic method is also used. The transmitting loop used in this operation process needs a special coil framework structure. In order to ensure the quality of data acquisition of the multi-turn small loop transient electromagnetic method, the multi-turn loop is required to be arranged into a square or a circle as much as possible during construction. When the loop device is placed vertically in the tunnel, the coil needs to be placed in a fixed shape framework to ensure that its shape meets the requirements. The commonly used method at present is to use PVC pipes, three-way pipes, and other materials to install a square framework in the well, and then bind the coil on the PVC pipe with adhesive tape. The problem of this framework building method is that considering the requirements of the wire frame specifications, 8 1m long PVC pipes and multiple PVC joints need to be carried, which takes a long time to build on site and is not convenient to carry. Moreover, due to material problems, the joints of the PVC pipes will be broken or loose after more than 3 times, which causes the framework to fail to maintain a regular square shape, affecting the accuracy of the data signal. In addition, the framework built on site has the problems of poor stability and support, which requires multiple people to participate in hand fixing. SUMMARY

[0004] The present application is directed to the technical problems of the above-mentioned framework built on site in the tunnel, and proposes a coil framework device for a tunnel in-loop small loop transient electromagnetic method, which has the advantages of reasonable design, good portability, high stability, saving of tunnel site construction time, and being conducive to ensuring the accuracy of the induction signal.

[0005] In order to achieve the above object, the technical scheme adopted by the present application is that the present application provides a kind of coil skeleton device of tunnel inside superimposed small loop transient electromagnetic method, including 8 skeleton units, the skeleton unit is non-metal material, 8 skeleton units are sequentially connected in head and tail, the skeleton unit includes stem, both ends of the stem are provided with end universal joint, the end of one end universal joint is provided with transition universal joint hinged therewith, the transition universal joint is used to connect adjacent skeleton units, the stem is provided with skirt plate of trumpet type at the position close to its end, the skirt plate is provided with multiple circular array distribution perforations, the perforation is used to wire, the outside of adjacent skeleton unit is provided with shaping unit, the shaping unit is used to shape skeleton unit into square, the shaping unit is non-metal material, the shaping unit includes C type clamping hole for being quickly clamped with stem and being arranged at both ends thereof.

[0006] As preferred, the shaping unit includes arc segment, the thickness of the arc segment gradually thins from the middle to both ends thereof, both ends of the arc segment are provided with shovel type segment, the width of the shovel type segment is greater than the width of the arc segment, and the C type clamping hole is arranged at the end of the shovel type segment.

[0007] As preferred, the arc segment is provided with circular arc opening in the middle thereof.

[0008] As preferred, the shaping unit is provided with support matched with the arc segment and circular arc opening thereof, the support is R type structure and includes vertical segment, the top end of the vertical segment is provided with S arc segment, and the end of the S arc segment is bent and extends towards the end of the vertical segment.

[0009] As preferred, at least one reinforcing assembly is arranged on the stem, the reinforcing assembly includes left buckle and right buckle in clamping cooperation, the left buckle is half ring column structure and is provided with a pair of arc-shaped clamping grooves at both ends thereof, the right buckle is half ring column structure and is provided with a pair of clamping teeth at both ends thereof for clamping with the clamping grooves, and the clamping teeth are C type in cross section.

[0010] As preferred, a pair of key type positioning grooves are arranged on the opposite face of the left buckle to the right buckle, and a pair of key type positioning protrusions are arranged on the opposite face of the right buckle to the left buckle.

[0011] As preferred, two pairs of counterbores are arranged on the left buckle and the right buckle, and the counterbores on the left buckle and the right buckle are connected by four symmetrical lock rings, the lock ring includes M type segment, one end of the M type segment is provided with a one-prong segment opposite to the M type opening, the end of the one-prong segment is provided with tenon, and the M type segment can be flipped to the end face of the left buckle and the right buckle around the center of cooperation of the tenon and the counterbores.

[0012] As preferred, the end universal joint is threadedly connected with a threaded sleeve provided at the end of the rod body, the inner wall of the threaded sleeve is provided with an inner shoulder, the inside of the threaded sleeve is provided with a shaft core axially limited with the inner shoulder, the end of the threaded sleeve is provided with a T-shaped sleeve, the inner wall of the T-shaped sleeve is provided with a plurality of first ring grooves, the outer wall of the shaft core is provided with a plurality of second ring grooves, the first ring groove and the corresponding second ring groove are provided with a snap ring, and the T-shaped sleeve is provided with an end hinge at the end away from the threaded sleeve.

[0013] As preferred, the transition universal joint comprises a first transition hinge hingedly connected with the end hinge, the side of the first transition hinge is provided with at least two third ring grooves distributed at intervals in the axial direction, and the first transition hinge is nested with a second transition hinge, the second transition hinge is provided with a plurality of radial screws outside the nesting surface of the first transition hinge, and the end of the radial screw is in sliding contact with the groove surface of the third ring groove.

[0014] As preferred, the rod body comprises a rod head and a solid rod body, the diameter of the rod body is smaller than that of the rod head, and the apron is arranged at the position where the rod head and the rod body are connected and the trumpet mouth of the apron faces the middle direction of the rod body.

[0015] Compared with the prior art, the application has the advantages and positive effects that:

[0016] The tunnel inside overlapping small loop transient electromagnetic method coil framework device provided by the application can be synchronously expanded and synchronously contracted through eight sequentially connected framework units, the framework units and the shaping units in the contracted state are convenient to carry, the framework units and the shaping units in the expanded state can form a relatively stable square framework system, which is beneficial to guarantee the precision of the induced signal, the apron on the rod body provides a constraint node for the turns of the coil on the square framework system, and the connection with adhesive tape is avoided. The device has the advantages of reasonable design, simple structure, good portability, high stability, saved tunnel site construction time, guaranteed induced signal precision, and suitability for large-scale promotion. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0018] Figure 1 It is a perspective view of a tunnel inside overlapping small loop transient electromagnetic method coil framework device.

[0019] Figure 2 It is a front view of a tunnel inside overlapping small loop transient electromagnetic method coil framework device.

[0020] Figure 3 Axonometric view of the reinforcement assembly and the locking ring on the skeleton unit;

[0021] Figure 4 Side view of the reinforcement assembly and the locking ring on the skeleton unit;

[0022] Figure 5 Sectional view of the reinforcement assembly, the locking ring and the skeleton unit in the H-H direction;

[0023] Figure 6 Axonometric view of Figure 5 Enlarged schematic view of the A structure;

[0024] Figure 7 Axonometric view of the rod body and the apron provided in the embodiment;

[0025] Figure 8 Exploded view of the reinforcement assembly and the locking ring provided in the embodiment;

[0026] Figure 9 Axonometric view of the shaping unit provided in the embodiment;

[0027] Figure 10 Axonometric view of the support provided in the embodiment;

[0028] Figure 11 Schematic view of the cooperation between the support and the shaping unit provided in the embodiment;

[0029] Figure 12 Top view of the eight skeleton units in the contraction process provided in the embodiment;

[0030] Figure 13 Perspective view of the eight skeleton units in the contraction process provided in the embodiment;

[0031] Figure 14 Schematic view of the eight skeleton units after contraction provided in the embodiment;

[0032] In the above figures, 1, skeleton unit; 11, rod body; 111, shaft; 112, head; 12, end universal joint; 121, threaded sleeve; 122, inner shoulder; 123, shaft core; 124, T-shaped sleeve; 125, first ring groove; 126, second ring groove; 127, snap ring; 128, end hinge; 13, transition universal joint; 131, first transition hinge; 132, third ring groove; 133, second transition hinge; 134, radial screw; 14, apron; 141, perforation; 2, shaping unit; 21, C-shaped clamping hole; 22, arc segment; 23, shovel segment; 24, circular arc opening; 3, support; 31, vertical segment; 32, S-arc segment; 4, reinforcing assembly; 41, left buckle; 42, right buckle; 43, buckle groove; 44, buckle tooth; 45, key type positioning groove; 46, key type positioning protrusion; 47, countersunk hole; 5, locking ring; 51, M-shaped segment; 52, straight line segment; 53, tenon. DETAILED DESCRIPTION

[0033] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the present application will be further described below in conjunction with the drawings and examples. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict. For the convenience of description, the following text appears "up", "down", "left", "right" words, only indicate the same with the upper, lower, left, right direction of the drawing itself, and do not limit the structure.

[0034] In the following description, a lot of specific details are set forth in order to provide a thorough understanding of the present application, however, the present application can also be implemented in other ways different from the description herein, therefore, the present application is not limited to the specific embodiments disclosed in the following description.

[0035] Examples, such as Figures 1-14As shown, the invention provides a tunnel inside the superimposed small loop transient electromagnetic method coil skeleton device, including 8 skeleton units 1, the skeleton unit 1 is non-metal material, 8 skeleton units 1 are sequentially connected, the skeleton unit 1 includes a rod body 11, both ends of the rod body 11 are provided with end universal joints 12, one end of the end universal joint 12 is provided with a transition universal joint 13 hinged thereto, the transition universal joint 13 is used to connect adjacent skeleton units 1, the rod body 11 is provided with a skirt 14 near the end, the skirt 14 is provided with a plurality of circular array distribution perforations 141, the perforation 141 is used for wiring, the outer side of the adjacent skeleton unit 1 is provided with a shaping unit 2, the shaping unit 2 is used for shaping the skeleton unit 1 into a square, the shaping unit 2 is non-metal material, the shaping unit 2 includes C-shaped clamping holes 21 provided at both ends and used for quick clamping with the rod body 11. The skeleton unit 1 and the shaping unit 2 are made of non-metal material, which can reduce the influence of the material on the magnetic induction signal of the transmitting coil and the receiving coil, and is beneficial to ensure the efficiency of the tunnel transient electromagnetic method detection.

[0036] Specifically, the invention forms a variable overall structure by 8 skeleton units 1 connected in sequence, the skeleton unit 1 can realize rotation and folding in multiple directions through the end universal joint 12 and the transition universal joint 13, so it can be expanded synchronously and contracted synchronously; for the skeleton unit 1 in the contracted state, 8 skeleton units 1 constitute a parallel relationship of 2 rows and 4 columns, the end universal joint 12 and the transition universal joint 13 are located at both ends of the contracted whole, and the shaping unit 2 can be clamped on the rod body 11 of each individual skeleton unit 1, so that 8 skeleton units 1 and the shaping unit 2 are all gathered together, and the non-metal material such as plastic is light in quality and easy to carry, which can save the time of building a square skeleton system on the spot in the tunnel.

[0037] In order to provide the frame required by the coil winding, the eight skeleton units 1 in the unfolded state can form a four-edged structure or an eight-edged structure, the included angle of adjacent skeleton units 1 is changed at the transition universal joint 13 position, and considering the detection requirements of the application, i.e. all the skeletons are required to form a square skeleton system, four shaping units 2 are uniformly clamped on the eight skeleton units 1, a relatively stable square skeleton system can be formed, which is beneficial to ensure the accuracy of the induction signal. For the apron 14 on the rod body 11, the apron 14 provides a constraint node for the coil winding on the square skeleton system, the multi-turn coil can be sequentially passed through the apron 14 without tape connection, and before the operation is completed, the apron 14 can be shrunk with the eight skeleton units 1, and is not easy to collapse and untangle, so that the stability is good, and the efficiency of the tunnel operation is improved. The interchangeability of the skeleton unit 1 provided by the application is high, so when a single skeleton unit 1 has a serious quality problem, it can be replaced in a targeted manner to ensure the comprehensive utilization rate of the entire device.

[0038] As shown in Figure 1 and Figures 9-11 shown, considering that the skeleton unit 1 and the shaping unit 2 are optimally made of PVC material, in order to improve the cooperation performance of the shaping unit 2 and the skeleton unit 1, the shaping unit 2 provided by the application comprises an arc segment 22, the thickness of the arc segment 22 gradually thins from the middle to the two ends, the two ends of the arc segment 22 are provided with shovel-shaped segments 23 which are relatively flat, the width of the shovel-shaped segment 23 is greater than the width of the arc segment 22, and the C-shaped clamping hole 21 is arranged at the end of the shovel-shaped segment 23. The shaping unit 2 provided by the application has a certain elasticity, especially at the joint position of the arc segment 22 and the shovel-shaped segment 23, and can produce corresponding elastic deformation under pressure, so as not to excessively increase the shear force at the position of the C-shaped clamping hole 21 and cause the rod body 11 to break, which is beneficial to prolong the comprehensive service life of the device. In the tunnel operation, the handheld position is provided by the arc segment 22 for the necessary handheld positioning, so as to facilitate the maintenance of the entire square skeleton system in the area to be detected.

[0039] Further, the arc segment 22 is provided with a circular arc opening 24 in the middle, and the circular arc opening 24 is arranged on the inner side of the arc of the arc segment 22, so that the toughness of the arc segment 22 can be improved, the arc segment 22 can better adapt to the dynamic pressure on the two skeleton units 1, and the probability of the C-shaped clamping hole and the rod body 11 being decoupled can be reduced to a certain extent, so as to ensure that it has an effective real-time clamping span, and further ensure the stability of the square frame of the device.

[0040] As shown in Figure 11As shown, the shaping unit 2 is provided with a support 3 matched with the arc segment 22 and the circular arc opening 24, the support 3 is R-shaped and comprises a vertical segment 31, the top end of the vertical segment 31 is provided with an S-arc segment 32, the end of the S-arc segment 32 is bent and extends towards the end of the vertical segment 31. The waist of the S-arc segment 32 has a small gap with the middle position of the vertical segment 31, and the gap can be expanded correspondingly during the fast clamping process, until the arc segment 22 is clamped in the clamping range formed by the head of the S-arc segment 32 and the vertical segment 31, and the clamping cannot be released without obvious external force. By using the support 3 which can be fast clamped with the shaping unit 2, the manpower can be released, especially in the case that the tunnel detection position is relatively narrow or there is a good fulcrum, the support 3 is clamped at the position of the circular arc opening 24, and the roots of the vertical segment 31 and the S-arc segment 32 are supported on the tunnel wall surface, so that the stability of the square framework system and the position of the launch coil can be ensured, and only the position of the receiving coil needs to be moved for corresponding detection operation.

[0041] Considering that the rod body 11 is made of plastic material, the straight line formed by the two framework units 1 at the same level is easy to have a certain bending curvature, therefore, the reinforcing assembly 4 is used to improve the straightness of the single rod body 11 in the straight line direction thereof. Specifically, as shown in Figures 1-3 and Figure 8 The rod body 11 is provided with at least one reinforcing assembly 4, the reinforcing assembly 4 comprises a left buckle 41 and a right buckle 42 matched with each other, the left buckle 41 is a semi-ring column structure and is provided with a pair of arc-shaped buckle grooves 43 at both ends, the right buckle 42 is a semi-ring column structure and is provided with a pair of buckle teeth 44 at both ends for clamping with the buckle grooves 43, and the cross section of the buckle teeth 44 is C-shaped. The reinforcing assembly 4 is designed to be sleeved with each other, and is not limited by the existing connection relationship of the eight framework units 1, and can flexibly establish a sleeving relationship with the rod body 11. The left buckle 41 and the right buckle 42 can be quickly formed into a clamping relationship through the cooperation of the buckle grooves 43 and the buckle teeth 44 designed at the ends of the two, and the clamping center of the two is the center of the rod body 11. Generally, the overall length of the framework unit 1 is 1 m, and the reinforcing assembly 4 can be about 10 cm. The reinforcing assembly 4 has a certain axial length, and is preferably arranged at a position close to the middle of the rod body 11, so that the probability of obvious bending curvature of the rod body 11 can be reduced, and the actual service life of the rod body 11 can be prolonged.

[0042] Further, the left buckle 41 is provided with a pair of key type positioning grooves 45 on the surface opposite to the right buckle 42, and the right buckle 42 is provided with a pair of key type positioning protrusions 46 on the surface opposite to the left buckle 41. The key type positioning grooves 45 and the key type positioning protrusions 46 can play a positioning role, avoid obvious axial displacement of the left buckle 41 and the right buckle 42, and share part of the pressure with the buckle teeth 44, so as to reduce the probability of tearing at the root of the buckle teeth 44.

[0043] To improve the winding effect of the coil on the square frame system formed by this device, the left sleeve 41 and the right sleeve 42 provided by the present invention are each provided with two pairs of countersunk holes 47. The countersunk holes 47 on the left sleeve 41 and the right sleeve 42 are connected by four symmetrical locking rings 5. The locking ring 5 includes an M-shaped segment 51. Both ends of the M-shaped segment 51 are provided with a straight segment 52 opposite to its M-shaped opening. The end of the straight segment 52 is provided with a tenon 53. The M-shaped segment 51 can be rotated around the mating center of the tenon 53 and the countersunk hole 47 to the end face of the left sleeve 41 and the right sleeve 42. The locking ring 5 can engage with the left and right latches 41 and 42 by opening the relative distance between the two tenons 53 at its ends until the tenons 53 and part of the straight section 52 are engaged in the countersunk hole 47. The tension of the locking ring 5 is used to improve the connection reliability of the reinforcement component 4. At the same time, when the coil passes through the locking ring 5, it can pass through the inside of the locking ring 5. The locking ring 5 can press the coil onto the rod body 11 by folding, and its M-shaped midpoint can be engaged with the end face of the reinforcement component 4 by friction and snapping. This, in conjunction with the through hole 141 provided on the skirt plate 14, can ensure the winding effect of the coil on the square frame system, which is beneficial to ensuring the accuracy of the sensing signal.

[0044] To improve the folding performance between adjacent skeleton units 1, such as Figure 6 As shown, the end universal joint 12 provided by the present invention is connected to the threaded sleeve 121 with the countersunk thread at the end of the rod 11. The inner wall of the threaded sleeve 121 is provided with an inner shoulder 122. The inside of the threaded sleeve 121 is provided with a shaft core 123 that is axially limited and matched with the inner shoulder 122. The end of the threaded sleeve 121 is provided with a T-shaped sleeve 124. The inner wall of the T-shaped sleeve 124 is provided with a plurality of first annular grooves 125. The outer wall of the shaft core 123 is provided with a plurality of second annular grooves 126. A retaining ring 127 is provided in the first annular groove 125 and the corresponding second annular groove 126. The T-shaped sleeve 124 is provided with an end hinge at the end facing away from the threaded sleeve 121. Among them, the threaded sleeve 121 and the end of the rod 11 are kept relatively stationary; the shaft core 123 adopts a stepped shaft with a shoulder design, and the shoulder and the inner shoulder 122 form an axial limiting relationship. On the other side of the inner shoulder 122, the retaining ring 127 and the T-shaped sleeve 124 form an axial limiting relationship in the opposite direction. Therefore, the shaft core 123 cannot move axially in the threaded sleeve 121, but it can ensure that it has a rotation function; the T-shaped sleeve 124 is connected to the end hinge head by bolts, and the two can rotate synchronously. Other structures that are hinged to the hinge hole on the end hinge head, namely the transition universal joint 13, can generate a folding action around the hinge hole.

[0045] Furthermore, the transition universal joint 13 provided by the present invention includes a first transition hinge 131 hinged to an end hinge. The side of the first transition hinge 131 is provided with at least two axially spaced third annular grooves 132. A second transition hinge 133 is nested on the first transition hinge 131. The second transition hinge 133 has multiple radial screws 134 on the outer side of its nesting surface with the first transition hinge 131. The ends of the radial screws 134 slide in contact with the groove surface of the third annular grooves 132. The opposite ends of the first transition hinge 131 and the second transition hinge 133 are nested. Between these nesting surfaces, the axial movement of the first transition hinge 131 and the second transition hinge 133 is restricted by the cooperation of the third annular grooves 132 and the radial screws 134, while maintaining relative rotational movement. Especially when the skeleton unit 1 needs to generate a folding direction movement, the rotation direction of the transition universal joint 13 can be flexibly adjusted to ensure that the eight skeleton units 1 ultimately form a reasonable convergent state.

[0046] like Figure 7 As shown, the rod 11 includes a rod head 112 and a solid rod body 111. The solid rod body 111 helps ensure the structural strength of the rod 11. The diameter of the rod body 111 is smaller than the diameter of the rod head 112. The skirt 14 is located at the junction of the rod head 112 and the rod body 111, and its flared end faces the middle of the rod body 111. In this way, the coil winding can extend from close to the rod body 111 and then pass through or out of the flared end, preventing the coil from folding sharply and affecting the normal transmission of current.

[0047] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A device for a borehole in-hole overlapping loop transient electromagnetic method coil skeleton, comprising 8 skeleton units, the skeleton units are non-metallic materials, characterized in that, 8 skeleton units are connected in sequence, the skeleton unit includes a rod body, both ends of the rod body are provided with end universal joints, the end of one end universal joint is provided with a transition universal joint hinged thereto, the transition universal joint is used for connecting adjacent skeleton units, the rod body is provided with a trumpet-shaped skirt near the end thereof, the skirt is provided with a plurality of circular array distributed perforations for wiring, the outer side of adjacent skeleton units is provided with a shaping unit, the shaping unit is used for shaping the skeleton unit into a square, the shaping unit is made of non-metal material, the shaping unit includes C-shaped clamping holes provided at both ends thereof and used for quick clamping with the rod body.

2. The coil skeleton device for the in-hole superimposed small-loop transient electromagnetic method according to claim 1, characterized in that, The shaping unit includes an arc segment, the thickness of the arc segment gradually decreases from the middle to both ends, both ends of the arc segment are provided with a shovel segment, the width of the shovel segment is greater than the width of the arc segment, and the C-shaped clamping hole is arranged at the end of the shovel segment.

3. The device according to claim 2, wherein, The arc segment is provided with a circular arc opening in the middle.

4. The device according to claim 3, wherein, The shaping unit is provided with a support matched with the arc segment and the circular arc opening, the support is in R-shaped structure and includes a vertical segment, the top end of the vertical segment is provided with an S-arc segment, and the end of the S-arc segment is bent and extends towards the end of the vertical segment.

5. The device according to claim 1, wherein, The rod body is provided with at least one reinforcing assembly, the reinforcing assembly includes a left buckle and a right buckle in clamping cooperation, the left buckle is in half-ring column structure and is provided with a pair of arc-shaped clamping grooves at both ends, the right buckle is in half-ring column structure and is provided with a pair of clamping teeth at both ends for clamping with the clamping grooves, and the clamping teeth are in C-shaped cross section.

6. The device according to claim 5, wherein, The left buckle is provided with a pair of key-shaped positioning grooves on the surface opposite to the right buckle, and the right buckle is provided with a pair of key-shaped positioning protrusions on the surface opposite to the left buckle.

7. The device according to claim 6, wherein, Both the left buckle and the right buckle are provided with two pairs of counter-sunk holes, the counter-sunk holes on the left buckle and the right buckle are connected by four symmetrical lock rings, the lock ring includes an M-shaped segment, both ends of the M-shaped segment are provided with a one-bar segment opposite to the M-shaped opening, the end of the one-bar segment is provided with a tenon, and the M-shaped segment can be flipped to the end surface of the left buckle and the right buckle around the center of the tenon and the counter-sunk hole.

8. The device according to claim 1, wherein, The end universal joint is in threaded connection with a threaded sleeve arranged in the counter-sunk groove of the rod body, the inner wall of the threaded sleeve is provided with an inner shoulder, the inside of the threaded sleeve is provided with a shaft core in axial limiting cooperation with the inner shoulder, the end of the threaded sleeve is provided with a T-shaped sleeve, the inner wall of the T-shaped sleeve is provided with a plurality of first ring grooves, the outer wall of the shaft core is provided with a plurality of second ring grooves, a clamping ring is arranged in the first ring groove and the corresponding second ring groove, and the T-shaped sleeve is provided with an end hinge at the end away from the threaded sleeve.

9. The device according to claim 8, wherein, The transition universal joint includes a first transition hinge hinged with the end hinge, the side surface of the first transition hinge is provided with at least two third ring grooves distributed in axial direction, the first transition hinge is nested with a second transition hinge, the second transition hinge is provided with a plurality of radial screws outside the nesting surface of the first transition hinge, and the end of the radial screw is in sliding contact with the groove surface of the third ring groove.

10. The device according to any one of claims 1-9, wherein, The rod body comprises a rod head and a solid rod body, the diameter of the rod body is smaller than that of the rod head, the skirt plate is arranged at the joint of the rod head and the rod body, and the flared opening of the skirt plate faces the middle direction of the rod body.

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