Photovoltaic plant grounding material copper-clad steel construction device

Abstract

The utility model relates to the technical field of construction devices, in particular to a photovoltaic plant grounding material copper-clad steel construction device which comprises a holding mechanism, a first welding die and a second welding die, the first welding die is detachably connected with the holding mechanism, and the second welding die is detachably connected with the holding mechanism. A first flux cavity and a first welding forming cavity are formed in the rear side of the first welding mold, and a second flux cavity and a second welding forming cavity are formed in the front side of the second welding mold. According to the photovoltaic factory grounding material copper-clad steel construction device, copper-clad steel is adopted to replace grounding flat steel to serve as a grounding material, the welding mode is exothermic welding, the material transferring workload is reduced through the construction method, manpower and material resources are saved, and the construction efficiency is improved. The welding method has the advantages of few welding points, short welding time, simple welding method, light weight of materials for welding, no need of an external power supply and the like, solves the problems of difficult welding, undercut, insufficient welding and the like between conductors, improves the working efficiency and shortens the construction period.

Description

Technical Field

[0001] The utility model relates to the technical field of construction devices, in particular to a copper-clad steel construction device for grounding materials in a photovoltaic plant area. Background Art

[0002] In the construction of domestic photovoltaic power stations, grounding flat steel is generally used as the grounding material for grounding construction in photovoltaic plants. The connection method of grounding flat steel is electric welding. Since the photovoltaic plant covers a large area, most construction sites do not have the conditions for temporary electricity supply for construction. Therefore, the construction power supply generally uses a diesel generator or a gasoline generator. The voltage and current generated by the generator are extremely unstable, which can easily damage the welding machine and cause the weld process to not meet the process standards. The length of each grounding flat steel is 6m, and the welding and transportation workload is relatively large. The grounding electrode uses angle steel or steel pipe, and the processing and manufacturing process is relatively complicated and cumbersome, which affects the construction efficiency. In view of this, we propose a copper-clad steel construction device for grounding materials in photovoltaic plants. Utility Model Content

[0003] The purpose of the utility model is to provide a copper-clad steel construction device for grounding materials in photovoltaic plants, so as to solve the problem mentioned in the above background technology that most construction sites do not have the conditions for temporary electricity supply for construction. Therefore, the construction power supply generally adopts a diesel generator or a gasoline generator, and the voltage and current emitted by the generator are extremely unstable, which can easily damage the welding machine and cause the welding process to fail to meet the process standards. In addition, the grounding flat steel is long, and the welding and transportation workload is large, which affects the construction efficiency.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A copper-clad steel construction device for grounding materials in a photovoltaic plant area, comprising a holding mechanism, a first welding mold and a second welding mold, wherein the first welding mold is detachably connected to the holding mechanism, and the second welding mold is detachably connected to the holding mechanism, a first flux cavity is provided at the top of the rear side of the first welding mold, a first conical feeding cavity is provided at the bottom of the first flux cavity, a first feeding pipe groove is provided at the bottom of the first conical feeding cavity, a first semicircular positioning groove is provided at the top of the first feeding pipe groove, a first welding forming cavity is provided at the bottom of the first feeding pipe groove, a second flux cavity is provided at the top of the front side of the second welding mold, a second conical feeding cavity is provided at the bottom of the second flux cavity, a second feeding pipe groove is provided at the bottom of the second conical feeding cavity, a second semicircular positioning groove is provided at the top of the second feeding pipe groove, a fusible isolation sheet is placed between the second semicircular positioning groove and the first semicircular positioning groove, and a second welding forming cavity is provided at the bottom of the second feeding pipe groove.

[0006] Preferably, the holding mechanism includes a triangular first clamp block and a triangular second clamp block, the triangular first clamp block and the triangular second clamp block are hinged by a pin shaft, the right end of the triangular first clamp block is provided with a first L-shaped connecting plate, the front side of the first L-shaped connecting plate is movably connected with a first fastening bolt, the right end of the triangular second clamp block is provided with a second L-shaped connecting plate, the rear side of the second L-shaped connecting plate is movably connected with a second fastening bolt.

[0007] Preferably, the left end of the triangular first clamp is hinged with a first driving arm via a pin, the left end of the triangular second clamp is hinged with a second driving arm via a pin, the left ends of the second driving arm and the first driving arm are hinged via a pin, the outer wall of the first driving arm is provided with a first handle, and the outer wall of the second driving arm is provided with a second handle.

[0008] Preferably, a first threaded mounting groove is provided in the middle and upper part of the front side of the first welding mold and close to the left side, and the end of the first fastening bolt passes through the front side of the first L-shaped connecting plate and is threadedly connected to the first threaded mounting groove; a second threaded mounting groove is provided in the middle and upper part of the rear side of the second welding mold and close to the left side, and the end of the second fastening bolt passes through the rear side of the second L-shaped connecting plate and is threadedly connected to the second threaded mounting groove.

[0009] Preferably, a first conductor groove is horizontally opened in the middle and lower part of the rear side of the first welding mold, a first copper-clad steel positioning groove is vertically opened in the middle of the bottom edge of the rear side of the first welding mold, and the first conductor groove and the first copper-clad steel positioning groove are both connected to the first welding forming cavity, and a second conductor groove is horizontally opened in the middle and lower part of the front side of the second welding mold, a second copper-clad steel positioning groove is vertically opened in the middle of the bottom edge of the front side of the second welding mold, and the second conductor groove and the second copper-clad steel positioning groove are both connected to the second welding forming cavity.

[0010] Preferably, a symmetrically distributed first positioning boss is provided on the rear side of the first welding mold and near the two ends of the top of the first welding forming cavity, and a symmetrically distributed positioning groove is provided on the front side of the second welding mold and near the two ends of the top of the second welding forming cavity, and the two first positioning bosses are respectively movably inserted into the two positioning grooves.

[0011] Preferably, a mold cover is hinged on the top of the rear side of the second welding mold, a U-shaped ignition groove is opened inwardly at the bottom of the front side of the mold cover, and an ignition powder delivery groove is opened on the top of the front side of the first welding mold, and the ignition powder delivery groove is connected to the first flux chamber.

[0012] Preferably, a second positioning boss is provided on the front side of the first welding mold and near the upper right corner, a positioning block is rotatably connected to the front side of the mold cover and near the right end, a positioning slot is provided on the left side of the positioning block and near the bottom, and the second positioning boss is movably connected to the positioning slot.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The copper-clad steel construction device for grounding materials of the photovoltaic plant adopts copper-clad steel instead of grounding flat steel as grounding material. The copper-clad steel grounding has the characteristics of corrosion resistance, convenient construction, and labor saving. The welding method adopted is exothermic welding. The reaction is carried out in the first and second high-temperature resistant welding molds. The exothermic reaction process only takes a few seconds and can be completed without any external energy or power. Compared with the traditional welding method, this construction method reduces the workload of material transportation and saves manpower and material resources. It has the advantages of fewer welding points, short welding time, simple welding method, light materials for welding, easy to carry, and no need for external power supply. This construction method solves the problems of difficult welding between conductors, undercutting, and cold welding. Secondly, this construction method reduces the error caused by manual welding, and the quality is easier to control, which improves work efficiency and shortens the construction period. It is suitable for photovoltaic power stations in general environments and special environments such as humid, saline-alkali, acidic soils and chemically corrosive media, and the applicable environment is relatively wide. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall first-view structure of the utility model;

[0016] Figure 2 It is a schematic diagram of the overall structure of the utility model from a second viewing angle;

[0017] Figure 3 It is a partial structural schematic diagram of the utility model;

[0018] Figure 4 It is a schematic diagram of the assembly structure of the first welding mold, the second welding mold and the fusible isolation sheet in the utility model;

[0019] Figure 5 This is a schematic diagram of the structure of the first welding mold in the utility model;

[0020] Figure 6 This is a schematic structural diagram of the second welding mold in the utility model from a first viewing angle;

[0021] Figure 7 It is a second perspective structural schematic diagram of the second welding mold in the utility model;

[0022] Figure 8It is a schematic diagram of the structure of the holding mechanism in the utility model.

[0023] In the figure: holding mechanism 1, triangular first clamping block 10, triangular second clamping block 11, first L-shaped connecting plate 12, second L-shaped connecting plate 13, first driving arm 14, second driving arm 15, first handle 16, second handle 17, first fastening bolt 18, second fastening bolt 19, first welding mold 2, first flux cavity 20, first conical feeding cavity 21, first feeding tube groove 22, first semicircular positioning groove 220, first conductor groove 23, first copper clad steel positioning groove 24, first welding Molding cavity 25, first positioning boss 26, first threaded mounting groove 27, second positioning boss 28, ignition powder delivery groove 29, second welding mold 3, second flux cavity 30, second conical feeding cavity 31, second feeding pipe groove 32, second semicircular positioning groove 320, second conductor groove 33, second copper-clad steel positioning groove 34, second welding molding cavity 35, positioning groove 36, second threaded mounting groove 37, mold cover 4, U-shaped ignition groove 40, positioning block 5, positioning card groove 50, fusible isolation plate 6. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0027] See also Figure 1-Figure 8 , the utility model provides a technical solution:

[0028] A photovoltaic plant grounding material copper-clad steel construction device comprises a holding mechanism 1, a first welding mold 2 and a second welding mold 3. The first welding mold 2 is detachably connected to the holding mechanism 1, and the second welding mold 3 is detachably connected to the holding mechanism 1, so as to facilitate replacement of welding molds with different apertures. The first welding mold 2 and the second welding mold 3 are a set of molds. The diameters of the conductor slots and the copper-clad steel positioning slots in the welding molds need to match the conductor diameter and the copper-clad steel diameter used in the photovoltaic power station to ensure that the first conductor slot 23 and the second conductor slot 33 can tightly clamp the conductor, and the first copper-clad steel positioning slot 24 and the second copper-clad steel positioning slot 34 can tightly clamp the copper-clad steel to avoid flux splashing.

[0029] A first flux chamber 20 is provided at the top of the rear side of the first welding mold 2, a first conical feeding chamber 21 is provided at the bottom of the first flux chamber 20, a first feeding pipe groove 22 is provided at the bottom of the first conical feeding chamber 21, a first semicircular positioning groove 220 is provided at the top of the first feeding pipe groove 22, a first welding forming chamber 25 is provided at the bottom of the first feeding pipe groove 22, a second flux chamber 30 is provided at the top of the front side of the second welding mold 3, the second flux chamber 30 is symmetrically arranged with the first flux chamber 20, a second conical feeding chamber 31 is provided at the bottom of the second flux chamber 30, the second conical feeding chamber 31 is symmetrically arranged with the first conical feeding chamber 21, the conical feeding chamber and the flux chamber are both used to contain flux and introduce the flux into the feeding pipe groove, the second conical feeding chamber A second feeding pipe groove 32 is provided at the bottom of 31, and the second feeding pipe groove 32 and the first feeding pipe groove 22 are symmetrically arranged, and are used to introduce the flux into the welding forming cavity. A second semicircular positioning groove 320 is provided at the top of the second feeding pipe groove 32, and a fusible isolation plate 6 is placed between the second semicircular positioning groove 320 and the first semicircular positioning groove 220. When the flux is poured in, the fusible isolation plate 6 is used to isolate the flux in the conical feeding cavity and the flux cavity to prevent the flux from entering the welding forming cavity before the flux is ignited. A second welding forming cavity 35 is provided at the bottom of the second feeding pipe groove 32, and the second welding forming cavity 35 and the first welding forming cavity 25 are symmetrically arranged. An exothermic reaction occurs between the flux and the copper-clad steel in the welding forming cavity to achieve exothermic welding.

[0030] In this embodiment, the holding mechanism 1 includes a triangular first clamp block 10 and a triangular second clamp block 11, which are hinged by a pin so that the triangular first clamp block 10 and the triangular second clamp block 11 can rotate. A first L-shaped connecting plate 12 is provided at the right end of the triangular first clamp block 10, and a first fastening bolt 18 is movably connected to the front side of the first L-shaped connecting plate 12. A second L-shaped connecting plate 13 is provided at the right end of the triangular second clamp block 11, and a second fastening bolt 19 is movably connected to the rear side of the second L-shaped connecting plate 13 for connecting with the first welding mold 2 and the second welding mold 3.

[0031] Specifically, the left end of the triangular first clamp 10 is hinged with a first driving arm 14 through a pin, and the left end of the triangular second clamp 11 is hinged with a second driving arm 15 through a pin. The left ends of the second driving arm 15 and the first driving arm 14 are hinged through a pin. The first driving arm 14 and the second driving arm 15 respectively drive the triangular first clamp 10 and the triangular second clamp 11 to rotate, thereby realizing the opening and closing of the first welding mold 2 and the second welding mold 3. The outer wall of the first driving arm 14 is provided with a first handle 16, and the outer wall of the second driving arm 15 is provided with a second handle 17. Increasing the power arm is beneficial to construction personnel in using the construction device.

[0032] Furthermore, a first threaded mounting groove 27 is opened in the middle and upper part of the front side of the first welding mold 2 and close to the left side, the end of the first fastening bolt 18 passes through the front side of the first L-shaped connecting plate 12 and is threadedly connected to the first threaded mounting groove 27, and a second threaded mounting groove 37 is opened in the middle and upper part of the rear side of the second welding mold 3 and close to the left side, the end of the second fastening bolt 19 passes through the rear side of the second L-shaped connecting plate 13 and is threadedly connected to the second threaded mounting groove 37, and the outer ends of the first fastening bolt 18 and the second fastening bolt 19 are both provided with disc knobs, so that construction personnel can manually disassemble and assemble the first fastening bolt 18 and the second fastening bolt 19 without the aid of other tools, which is beneficial for construction personnel to replace welding molds with different apertures as needed.

[0033] Furthermore, a first conductor slot 23 is horizontally opened in the middle and lower part of the rear side of the first welding mold 2, a first copper-clad steel positioning slot 24 is vertically opened in the middle of the bottom edge of the rear side of the first welding mold 2, and the first conductor slot 23 and the first copper-clad steel positioning slot 24 are both connected to the first welding molding cavity 25, a second conductor slot 33 is horizontally opened in the middle and lower part of the front side of the second welding mold 3, the second conductor slot 33 and the first conductor slot 23 are symmetrically arranged for tightly clamping the conductor, a second copper-clad steel positioning slot 34 is vertically opened in the middle of the bottom edge of the front side of the second welding mold 3, the second copper-clad steel positioning slot 34 and the first copper-clad steel positioning slot 24 are symmetrically arranged for tightly clamping the copper-clad steel, the second conductor slot 33 and the second copper-clad steel positioning slot 34 are both connected to the second welding molding cavity 35, the second welding molding cavity 35 and the first welding molding cavity 25 are symmetrically arranged, and the exothermic reaction is carried out in the second welding molding cavity 35 and the first welding molding cavity 25.

[0034] Furthermore, symmetrically distributed first positioning bosses 26 are provided on the rear side of the first welding mold 2 and near the two ends of the top of the first welding forming cavity 25, and symmetrically distributed positioning grooves 36 are provided on the front side of the second welding mold 3 and near the two ends of the top of the second welding forming cavity 35. The two first positioning bosses 26 are respectively movably inserted into the two positioning grooves 36, which is beneficial to the mold closing of the first welding mold 2 and the second welding mold 3 and avoids misalignment during use.

[0035] Furthermore, a mold cover 4 is hinged on the top of the rear side of the second welding mold 3, a U-shaped ignition groove 40 is opened inward at the bottom of the front side of the mold cover 4, and an ignition powder delivery groove 29 is opened on the top of the front side of the first welding mold 2. The ignition powder delivery groove 29 is connected to the first flux chamber 20 and is used to ignite the ignition powder on the surface of the solvent.

[0036] Furthermore, a second positioning boss 28 is provided on the front side of the first welding mold 2 and near the upper right corner, a positioning block 5 is rotatably connected to the front side of the mold cover 4 and near the right end, a positioning slot 50 is provided on the left side of the positioning block 5 and near the bottom, the second positioning boss 28 is movably connected in the positioning slot 50, and the position of the mold cover 4 is fixed by the positioning block 5 to prevent excessive combustion reaction during welding from breaking open the mold cover 4 and causing loss of flux or injury to construction personnel.

[0037] When the copper-clad steel construction device for grounding materials in photovoltaic plants of this embodiment is in use, construction personnel shall dry and dehumidify the first welding mold 2 and the second welding mold 3 before welding, remove debris in the mold cavity, lay the copper-clad steel material in the grounding trench, and then position the conductor and the copper-clad steel according to the docking form of the welding materials. Then, the first welding mold 2 and the second welding mold 3 are aligned and clamped by the holding mechanism 1, so that the conductor is tightly clamped by the first conductor groove 23 and the second conductor groove 33, and the copper-clad steel is tightly clamped by the first copper-clad steel positioning groove 24 and the second copper-clad steel positioning groove 34. No residual holes and offset seams should be left to prevent high-temperature flux from flowing out of the mold. If necessary, sealing mud should be used to seal it. Afterwards, the construction personnel place the fusible isolation sheet 6 in the first semicircular positioning groove 220 and the second semicircular positioning groove 320 to close the tops of the first feeding pipe groove 22 and the second feeding pipe groove 32 to avoid flux. Enter the first welding forming cavity 25 and the second welding forming cavity 35, and then the construction personnel pour the flux into the first flux cavity 20 and the second flux cavity 30, and then evenly sprinkle the ignition powder on the surface of the flux, and continue to the ignition powder delivery slot 29 of the first welding mold 2. After sprinkling the ignition powder, cover the mold cover 4, and engage the positioning block 5 with the second positioning boss 28 to fix the position of the mold cover 4, and then use an ignition gun to ignite the ignition powder in the ignition powder delivery slot 29. The flux is ignited, and the fusible isolation plate 6 is melted. The ignited flux enters the first welding forming cavity 25 and the second welding forming cavity 35 through the first feeding pipe groove 22 and the second feeding pipe groove 32. At this time, the flux and the copper-clad steel react exothermically to achieve exothermic welding. After the flux in the mold is burned out, open the mold cover 4 after a few seconds, and then open the first welding mold 2 and the second welding mold 3 through the holding mechanism 1.

[0038] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A copper-clad steel construction device for photovoltaic plant grounding material, characterized in that: The invention comprises a holding mechanism (1), a first welding mold (2) and a second welding mold (3), wherein the first welding mold (2) is detachably connected to the holding mechanism (1), and the second welding mold (3) is detachably connected to the holding mechanism (1). A first flux cavity (20) is provided at the top of the rear side of the first welding mold (2), a first conical material discharge cavity (21) is provided at the bottom of the first conical material discharge cavity (21), a first material discharge pipe groove (22) is provided at the bottom of the first conical material discharge cavity (21), a first semicircular positioning groove (220) is provided at the top of the first material discharge pipe groove (22), and the first material discharge pipe groove (22) is provided with a first semicircular positioning groove (220). A first welding forming cavity (25) is provided at the bottom, a second flux cavity (30) is provided at the top of the front side of the second welding mold (3), a second conical material discharge cavity (31) is provided at the bottom of the second flux cavity (30), a second material discharge pipe groove (32) is provided at the bottom of the second conical material discharge cavity (31), a second semicircular positioning groove (320) is provided at the top of the second material discharge pipe groove (32), a fusible isolation plate (6) is placed between the second semicircular positioning groove (320) and the first semicircular positioning groove (220), and a second welding forming cavity (35) is provided at the bottom of the second material discharge pipe groove (32).

2. The photovoltaic plant grounding material copper-clad steel construction device according to claim 1 is characterized in that: The holding mechanism (1) comprises a triangular first clamping block (10) and a triangular second clamping block (11), wherein the triangular first clamping block (10) and the triangular second clamping block (11) are hinged via a pin shaft, a first L-shaped connecting plate (12) is provided at the right end of the triangular first clamping block (10), a first fastening bolt (18) is movably connected to the front side of the first L-shaped connecting plate (12), and a second L-shaped connecting plate (13) is movably connected to the rear side of the second L-shaped connecting plate (13) with a second fastening bolt (19).

3. The photovoltaic plant grounding material copper-clad steel construction device according to claim 2 is characterized by: The left end of the triangular first clamp (10) is hinged to a first driving arm (14) via a pin, the left end of the triangular second clamp (11) is hinged to a second driving arm (15) via a pin, the second driving arm (15) and the left end of the first driving arm (14) are hinged to each other via a pin, the outer wall of the first driving arm (14) is provided with a first handle (16), and the outer wall of the second driving arm (15) is provided with a second handle (17).

4. The photovoltaic plant grounding material copper-clad steel construction device according to claim 2, characterized in that: A first threaded mounting groove (27) is provided at a position close to the left side and in the middle upper part of the front side of the first welding mold (2); an end of the first fastening bolt (18) passes through the front side of the first L-shaped connecting plate (12) and is threadedly connected to the first threaded mounting groove (27); a second threaded mounting groove (37) is provided at a position close to the left side and in the middle upper part of the rear side of the second welding mold (3); an end of the second fastening bolt (19) passes through the rear side of the second L-shaped connecting plate (13) and is threadedly connected to the second threaded mounting groove (37).

5. The photovoltaic plant grounding material copper-clad steel construction device according to claim 1, characterized in that: A first conductor slot (23) is horizontally provided at the middle and lower part of the rear side of the first welding mold (2), a first copper-clad steel positioning slot (24) is vertically provided at the middle part of the bottom edge of the rear side of the first welding mold (2), and the first conductor slot (23) and the first copper-clad steel positioning slot (24) are both connected to the first welding forming cavity (25); a second conductor slot (33) is horizontally provided at the middle and lower part of the front side of the second welding mold (3), a second copper-clad steel positioning slot (34) is vertically provided at the middle part of the bottom edge of the front side of the second welding mold (3), and the second conductor slot (33) and the second copper-clad steel positioning slot (34) are both connected to the second welding forming cavity (35).

6. The photovoltaic plant grounding material copper-clad steel construction device according to claim 1, characterized in that: A symmetrically distributed first positioning convex column (26) is provided on the rear side of the first welding mold (2) and near the two ends of the top of the first welding molding cavity (25), and a symmetrically distributed positioning groove (36) is provided on the front side of the second welding mold (3) and near the two ends of the top of the second welding molding cavity (35), and the two first positioning convex columns (26) are movably inserted into the two positioning grooves (36) respectively.

7. The photovoltaic plant grounding material copper-clad steel construction device according to claim 1, characterized in that: A mold cover (4) is hingedly connected to the top of the rear side of the second welding mold (3), a U-shaped ignition groove (40) is provided inwardly at the bottom of the front side of the mold cover (4), and an ignition powder delivery groove (29) is provided at the top of the front side of the first welding mold (2), and the ignition powder delivery groove (29) is connected to the first flux chamber (20).

8. The photovoltaic plant grounding material copper-clad steel construction device according to claim 7, characterized in that: A second positioning convex column (28) is provided on the front side of the first welding mold (2) and near the upper right corner; a positioning block (5) is rotatably connected to the front side of the mold cover (4) and near the right end; a positioning slot (50) is provided on the left side of the positioning block (5) and near the bottom; and the second positioning convex column (28) is movably connected to the positioning slot (50).

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