CN113241998A - Flexible photovoltaic fixed bolster of prestressing force - Google Patents

Abstract

The invention relates to a prestressed flexible photovoltaic fixed support which comprises at least two rows of photovoltaic supports; every row of photovoltaic support includes at least a set of end stand, and two flexible cable wires of end stand at the length direction tractive of cable wire, two cable wires form height structure, mountable solar cell panel on two cable wires, and the cable wire is prestressing force galvanized steel strand wires, sets up between the intermediate column of adjacent photovoltaic support and strengthens connection structure to promote intermediate column and arrange wide bearing capacity and the overall stability of direction. The prestressed flexible photovoltaic fixing support is simple in structure, the number of the stand columns and the number of the foundations are small, the construction period is shortened, the construction cost is reduced, and the safe use requirement under various working conditions is met.

Description

Flexible photovoltaic fixed bolster of prestressing force

Technical Field

The invention relates to the field of photovoltaics, in particular to a prestressed flexible photovoltaic fixing support.

Background

Existing photovoltaic support structures, see prior patent, patent No.: 201921473472, patent name: a support column structure and a flexible inhaul cable support are provided.

In the patent, a plurality of solar panels in each row are mounted on two bearing steel cables, in order to enable the solar panels to be obliquely arranged, the two steel cables in each row need to be supported by two end supporting frames and a plurality of middle supporting frames, the former end supporting frame adopts two high-end columns and a low-end column, one bearing steel cable is connected with the high-end column, and the other bearing steel cable is connected with the low-end column; meanwhile, the high-end column needs to be pulled through two diagonal draw bars, one is a main heavy diagonal draw bar, the other is a light diagonal draw bar, and similarly, the low-end column is also pulled through the main heavy diagonal draw bar and the light diagonal draw bar. The connection of the high-end column and the ground needs an embedded part, and the connection of the diagonal draw bar and the ground also needs the embedded part; therefore, in the former end supporting frames, six ground embedded parts (a high-end column embedded part, a low-end column embedded part, two main heavy diagonal-pulling rod embedded parts and two light diagonal-pulling rod embedded parts) need to be arranged on one side of each row of photovoltaic supports, so that the former photovoltaic supports are built, the two end supporting frames are complex in structure, many in parts, long in construction period, high in cost and inflexible in arrangement, and too many diagonal-pulling rods influence workers to walk and overhaul on the photovoltaic supports.

The middle support frame is supported by a triangular upright post, and the bottom of the triangular upright post is hinged with a hinged support, so that the triangular support can swing; the inclined pull rods with adjustable lengths are matched on the two sides of the triangular support to be tensioned, and the inclination angle of the triangular support is adjusted by adjusting the lengths of the two inclined pull rods, so that the middle parts of the two bearing steel cables also keep corresponding inclination angles. Therefore, the traditional middle support frame needs to be matched with a combination of one triangular upright post and two adjustable diagonal draw bars, three foundation embedded parts need to be arranged in the combination, and the combination also has the disadvantages of complex structure, more parts, long construction period and high cost.

Moreover, each row of photovoltaic is independent, and the rows lack connection, so that the whole impact strength resistance of the photovoltaic support is not high.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the defects of the prior art are overcome, the flexible photovoltaic fixing support with the prestress is provided, and the problems that the structure of the conventional photovoltaic support is complex, the construction period is long, and the arrangement is inflexible are solved.

The technical scheme adopted by the invention for solving the technical problems is as follows:

the prestressed flexible photovoltaic fixing support is characterized by comprising at least two rows of photovoltaic supports;

each row of photovoltaic supports comprises at least one group of end upright columns;

the end upright posts draw the two flexible steel cables in the length direction of the steel cables, the two steel cables form a high-low structure, and the two steel cables can be provided with solar panels. The steel cable is a prestressed galvanized steel strand.

The photovoltaic support further comprises middle columns, and reinforced connection structures are arranged between the middle columns of the adjacent photovoltaic supports so as to improve the bearing capacity and stability of the middle columns in the row width direction.

Furthermore, the reinforced connecting structure comprises a cross bar and two inclined pull steel strands, the cross bar is connected between one middle upright post and the other middle upright post adjacent to the middle upright post,

the two inclined pull steel strands are connected between one middle upright post and the other middle upright post adjacent to the middle upright post in an X shape.

Furthermore, the cross bar is a rigid cross bar, the upper end of the upright post body of the middle upright post is provided with a cross bar connecting plate, and two ends of the cross bar are respectively fixedly installed with the cross bar connecting plates of the corresponding middle upright posts;

the inclined pull steel strand is a flexible pull rope, the upper end of the inclined pull steel strand is fixed to the upper portion of the middle upright post, and the lower end of the inclined pull steel strand is fixed to the lower portion of the other adjacent middle upright post.

Further, the mode that the inclined pull steel strand is fixed with the upper part and/or the lower part of the middle upright post is as follows: the end parts of the inclined pull steel strands are adjustably connected with the upper part and/or the lower part of the foundation of the middle upright post through the turn buckle bolt pieces or are adjustably connected through the adjustable components;

the adjustable component comprises a U-shaped pipe fitting, the opening end of the U-shaped pipe fitting is sleeved into the connecting block, the pull rope penetrates through a pull rope hole in the middle of the connecting block and then is fixed by the limiting nut, and the connecting block is moved to be fixed by the locking nut after the connecting block is located at the required position of the U-shaped pipe fitting.

Furthermore, the middle upright post comprises a hinged support, an upright post body and a middle cross beam;

the lower end of the upright post body is hinged with the hinged support so that the upright post body can swing on the hinged support along the length direction of the steel cable to balance unbalanced force generated by external load;

the upper end of the upright post body is provided with a middle cross beam which is obliquely arranged at the upper end of the upright post body;

two ends of the middle cross beam are respectively provided with a locking component for locking the steel cable;

the locking assembly comprises a lock bottom plate and two U-shaped bolts, the lock bottom plate is fixedly connected with the middle cross beam, the U-shaped bolts are arranged on two sides of the lock bottom plate, and the steel cable penetrates through the space between the U-shaped bolts and the lock bottom plate and is locked and buckled on the lock bottom plate by the U-shaped bolts.

Or the locking assembly is a U-shaped mounting piece fixedly mounted with the cross beam.

Furthermore, the middle cross beam is fixedly connected with the upright post body, a first inclined supporting rod and a second inclined supporting rod are arranged between the middle cross beam and the upright post body, and the middle cross beam, the first inclined supporting rod and the second inclined supporting rod form a triangular structure.

Further, the end post includes:

the end upright post comprises an end upright post body, wherein a connecting support is arranged at the upper end of the end upright post body, and an inclined mounting surface is formed on the top end surface of the connecting support;

and the end cross beam is fixedly arranged on the inclined mounting surface of the connecting support, and two ends of the end cross beam are used for respectively drawing the two steel cables.

Further, the structure of the end beam pulling steel cable is as follows: and steel cable through holes are formed in two ends of the end cross beam, and the steel cable penetrates through the steel cable through holes and then is fixed.

Or reinforcing plates are arranged at two ends of the end beam, steel cable through holes are formed in the reinforcing plates, and the steel cables penetrate through the steel cable through holes and then are fixed.

Furthermore, the flexible photovoltaic fixed bolster of prestressing force still includes two and draws the subassembly to one side, and the upper end that two draw the subassembly to one side is connected with end crossbeam both ends respectively, and the lower extreme that two draw the subassembly to one side is connected with the tip basis respectively.

Furthermore, the diagonal pulling assembly comprises a pull rod, the upper end of the pull rod is connected with an upper support plate on the end cross beam through an adjustable assembly, and the lower end of the pull rope is connected with a lower support on the foundation through an adjustable assembly;

the adjustable component comprises a U-shaped pipe fitting, the opening end of the U-shaped pipe fitting is sleeved into the connecting block, the pull rope penetrates through a pull rope hole in the middle of the connecting block and then is fixed by the limiting nut, and the connecting block is moved to be fixed by the locking nut after the connecting block is located at the required position of the U-shaped pipe fitting.

The invention has the beneficial effects that:

the prestressed flexible photovoltaic fixed support is simple in structure, clear in stress and simple in construction, shortens the construction period, reduces the construction cost and improves the flexibility of arrangement of the photovoltaic support.

The cross beams on the end columns are directly arranged in an inclined mode, so that two high and low end columns do not need to be built, the end columns are stable and reliable in structure, and two steel cables can be stably and reliably pulled at the end portions of the photovoltaic support.

The single middle stand column and the cross beam are directly obliquely and fixedly arranged on the stand column body, the stand column body and the hinged support are directly hinged on site, construction is convenient, and the construction period of the photovoltaic support is shortened.

Drawings

The invention is further described below with reference to the accompanying drawings.

FIG. 1 is a schematic view of a pre-stressed flexible photovoltaic mounting bracket according to the present invention;

FIG. 2 is a schematic view of an inter-row reinforcement structure;

FIG. 3 is a schematic illustration of the inter-row reinforcing structure (connecting cables);

FIG. 4 is a schematic view of a photovoltaic mount rocking mechanism (connecting intermediate foundation columns);

FIG. 5 is a schematic view of a rocking mechanism for a photovoltaic mount;

FIG. 6 is a schematic view of the locking assembly;

FIG. 7 is a schematic view of a photovoltaic mount with a rocking mechanism connecting the cables;

FIG. 8 is a schematic view of an end stud;

FIG. 9 is a schematic illustration of a wire rope pulling structure;

FIG. 10 is a schematic illustration of a cable pulling structure connecting the cables;

FIG. 11 is a schematic view of an adjustable assembly;

FIG. 12 is a schematic view of the installation of the U-shaped mounts with the intermediate beam;

wherein the content of the first and second substances,

1. a steel cord;

2. end column, 21, end column body, 22, end beam, 221, steel cable perforation, 23, connecting support, 24, upper support plate, 25, adjustable component, 251, U-shaped pipe fitting, 252, connecting block, 26, pull rope, 27, lower support, 28 and reinforcing plate;

3. the middle upright post 31, the upright post body 311, the column body 312, the hinge plate 313, the support plate 32 and the middle cross beam; 33. a first diagonal strut 34, a second diagonal strut;

4. a locking assembly 41, a locking bottom plate 42 and a U-shaped bolt; 43. a U-shaped mounting member;

5. a hinged support 51, a middle foundation column;

61. a cross bar 62, a diagonal steel strand 63 and a basket bolt piece.

Detailed Description

The invention will now be further described with reference to the accompanying drawings. These drawings are simplified schematic diagrams only illustrating the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.

As shown in fig. 1 to 11, a prestressed flexible photovoltaic fixing support includes at least two rows of photovoltaic supports;

each row of photovoltaic supports comprises at least one group of end upright columns 2 and middle upright columns 3; a set of end posts 2 includes two end posts, both ends of each row of photovoltaic supports are listed as to two end posts.

The end upright posts 2 pull the two flexible steel cables 1 in the length direction of the steel cables 1, the two steel cables 1 form a high-low structure, and solar panels can be installed on the two steel cables 1. The steel cable 1 is a prestressed galvanized steel strand.

Set up between the middle standing pillar 3 of adjacent photovoltaic support and strengthen connection structure to promote middle standing pillar 3 at the impact resistance of row width direction.

In this embodiment, each row of photovoltaic fixed bolster includes two end posts 2 and two middle posts 3.

Specifically, as an alternative embodiment in this embodiment, as shown in fig. 2 and fig. 3, the reinforcing connection structure includes a cross bar 61 and two diagonal-pulling steel strands 62, the cross bar 61 is connected between one middle upright 3 and another middle upright 3 adjacent thereto, and the two diagonal-pulling steel strands 62 are connected between one middle upright 3 and another middle upright 3 adjacent thereto in an "X" shape.

Specifically, as an optional implementation manner in this embodiment, the cross bar 61 is a rigid cross bar, the upper end of the column body 31 of the middle column 3 is provided with a cross bar connecting plate, and two ends of the cross bar 61 are respectively and fixedly mounted on the cross bar connecting plates of the corresponding middle columns 3;

the inclined pull steel strand 62 is a flexible pull rope 26, the upper end of the inclined pull steel strand 62 is fixed with the upper part of the middle upright post 3, and the lower end of the inclined pull steel strand 62 is fixed with the lower part of the other adjacent middle upright post 3.

Specifically, as an optional implementation manner in this embodiment, the manner of fixing the diagonal steel strand 62 to the upper and/or lower foundation of the middle upright 3 is as follows: the ends of the inclined pull steel strands 62 are adjustably connected with the upper and/or lower foundation of the middle upright post 3 through turn-buckle bolt pieces 63 or are adjustably connected through an adjustable assembly 25;

the adjustable assembly 25 comprises a U-shaped pipe 251, the open end of the U-shaped pipe 251 is sleeved into the connecting block 252, the pull rope 26 passes through a pull rope hole in the middle of the connecting block 252 and is fixed by a limiting nut, and the connecting block 252 is fixed by a locking nut after the connecting block 252 is moved to the required position of the U-shaped pipe 251.

Specifically, as an alternative embodiment in this embodiment, as shown in fig. 4, fig. 5, fig. 7, the center pillar 3 includes a hinge support 5, a pillar body 31, and a center cross member 32; the column body 31 is an i-beam or other cross-section beam.

The lower end of the upright post body 31 is hinged with the hinged support 5, so that the upright post body 31 can swing on the hinged support 5 along the length direction of the steel cable 1;

the upper end of the upright post body 31 is provided with a middle cross beam 32, and the middle cross beam 32 is obliquely arranged at the upper end of the upright post body 31;

the two ends of the middle cross beam 32 are both provided with locking components 4 for locking the steel cable 1;

as shown in fig. 6, the locking assembly 4 includes a locking base plate 41 and two U-bolts 42, the locking base plate 41 is fixedly connected to the middle cross beam 32, the U-bolts 42 are disposed on both sides of the locking base plate 41, and the steel cable 1 passes through between the U-bolts 42 and the locking base plate 41 and is locked on the locking base plate 41 by the U-bolts 42.

Specifically, as an alternative embodiment in this embodiment, as shown in fig. 12, the locking assembly 4 is a U-shaped mounting member 43 fixedly mounted to the cross beam 32, and the steel cable 1 passes through between the U-shaped mounting member and the top surface of the cross beam 32.

Specifically, as an optional implementation manner in this embodiment, as shown in fig. 4 and fig. 5, the middle cross beam 32 is fixedly connected to the column body 31, a first diagonal brace 33 and a second diagonal brace 34 are disposed between the middle cross beam 32 and the column body 31, and the middle cross beam 32, the first diagonal brace 33, and the second diagonal brace 34 form a triangular structure.

Specifically, in this embodiment, the bottom of the hinged support 5 is provided with a pre-buried middle foundation column 51, and the bottom of the hinged support 5 is fixedly connected with the middle foundation column 51. Specifically, the hinge support 5 is fixed to the column base of the intermediate base column 51 by bolts.

In this embodiment, the middle foundation column 51 is provided with the hoop, and the diagonal steel strand 62 is connected to the hoop, so that the diagonal steel strand 62 is connected to the middle foundation column 51, that is, fixed to the lower foundation of the middle upright 3.

The column body 31 includes a column portion 311 and a hinge portion, and the column portion 311 is in the form of a single column. The single upright column is simple in structure, does not occupy the space below the steel cable, and is convenient for workers to walk and overhaul.

The hinge portion of the pillar body 31 has a hinge plate 312, and the hinge plate 312 is hinged to the hinge support 5.

A support plate 313 is provided between the hinge plate 312 and the column 311. The support plate 313, the hinge plate 312 and the column body 311 are fixed by welding, so that the bottom strength of the upright column body is improved.

Specifically, as an alternative implementation manner in this embodiment, as shown in fig. 8, fig. 9, and fig. 10, the end pillar 2 includes:

the end upright post comprises an end upright post body, wherein a connecting support 23 is arranged at the upper end of the end upright post body, and an inclined mounting surface is formed on the top end surface of the connecting support 23;

and the end cross beam 22 is fixedly arranged on the inclined mounting surface of the connecting support 23, and two ends of the end cross beam 22 are used for respectively pulling the two steel cables 1.

Specifically, as an optional implementation manner in this embodiment, the structure of the end cross beam 22 pulling the steel cable 1 is: two ends of the end beam 22 are provided with steel cable through holes 221, and the steel cable 1 penetrates through the steel cable through holes 221 and then is fixed;

or, the two ends of the end beam 22 are provided with reinforcing plates 28, the reinforcing plates 28 are provided with steel cable through holes 221, and the steel cable 1 is fixed after passing through the steel cable through holes 221.

The reinforcing plate 28 is used as a backing plate, the end part of the steel cable 1 is connected with an anchorage device, and the anchorage device is abutted on the reinforcing plate 28, so that the local pressure applied to the cross beam is reduced.

Specifically, as an optional implementation manner in this embodiment, the flexible photovoltaic fixed bolster of prestressing force still includes two and draws the subassembly to one side, and two draw the upper end of subassembly to one side respectively with end crossbeam 22 both ends be connected, two draw the lower extreme of subassembly to one side respectively with ground connection.

Specifically, as an optional implementation manner in this embodiment, the cable-stayed assembly includes a pulling rope 26, an upper end of the pulling rope 26 is connected to the upper support plate 24 on the end cross beam 22 through an adjustable assembly 25, and a lower end of the pulling rope 26 is connected to a lower support 27 on the ground through the adjustable assembly 25;

as shown in fig. 11, the adjustable assembly 25 includes a U-shaped tube 251, the open end of the U-shaped tube 251 is sleeved into the connecting block 252, the pulling rope 26 passes through the pulling rope hole in the middle of the connecting block 252 and is fixed by a limiting nut, and the connecting block 252 is moved to be fixed by a locking nut after the U-shaped tube 251 is located at a desired position.

When the photovoltaic fixed support is built, pre-buried foundation columns are built at two ends, then the end upright columns 2 are installed, the end cross beams 22 on the end upright columns 2 are obliquely arranged, and the end cross beams 22 are pulled with the ground through the two diagonal pulling assemblies; the middle foundation column 51 is built in the middle position, the middle upright columns 3 are vertically installed, the middle upright columns 3 between two adjacent rows are provided with connection reinforced connection structures, and the shock resistance between the rows is improved.

Next, the steel cord 1 is threaded: the steel cable 1 penetrates between the end upright post 2 and the middle upright post 3, the locking assembly 4 fixes the steel cable 1 and the middle cross beam 32, the end part of the steel cable 1 is fixedly connected with the end cross beam 22, after the steel cable 1 is installed, the solar cell panel is fixed on the two steel cables 1, and the end cross beam 22 and the middle cross beam 32 are obliquely arranged, so that the installed solar cell panel is obliquely arranged.

Whole photovoltaic fixed bolster compares with the support in the past, has reduced the quantity that reduces the built-in fitting on ground, reduces time limit for a project, reduce cost to arrange and promote with arranging between joint strength, promote whole photovoltaic fixed bolster and resist the ability of abominable weather.

In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims (10)

1. A prestressed flexible photovoltaic fixed support is characterized by comprising at least two rows of photovoltaic supports;

each row of photovoltaic supports comprises at least one group of end columns (2);

the end upright columns (2) pull the two flexible steel cables (1) in the length direction of the steel cables (1), the two steel cables (1) form a high-low structure, and solar panels can be installed on the two steel cables (1).

2. The pre-stressed flexible photovoltaic anchor bracket of claim 1,

the photovoltaic support further comprises middle columns (3), and reinforced connecting structures are arranged between the middle columns (3) of the adjacent photovoltaic supports so as to improve the bearing capacity and stability of the middle columns (3) in the row width direction.

3. The pre-stressed flexible photovoltaic anchor bracket of claim 2,

the reinforced connecting structure between the middle upright columns (3) of the adjacent photovoltaic supports comprises a cross bar (61) and two inclined pull steel strands (62), wherein the cross bar (61) is connected between one middle upright column (3) and the other middle upright column (3) adjacent to the middle upright column;

two inclined pull steel strands (62) are connected between one middle upright post (3) and the other middle upright post (3) adjacent to the middle upright post in an X shape.

4. The prestressed flexible photovoltaic fixed support according to claim 3, wherein the cross bar (61) is a rigid cross bar, the upper end of the column body (31) of the middle column (3) is provided with a cross bar connecting plate, and two ends of the cross bar (61) are respectively fixedly mounted with the cross bar connecting plates of the corresponding middle column (3);

the inclined pulling steel strand (62) is a flexible pulling rope (26), the upper end of the inclined pulling steel strand (62) is fixed to the upper portion of the middle upright post (3), and the lower end of the inclined pulling steel strand (62) is fixed to the lower portion of the other adjacent middle upright post (3).

5. The interbay reinforcing structure of a photovoltaic support according to claim 3, wherein the diagonal steel strands (62) are fixed to the upper and/or lower base of the central pillar (3) in a manner that: the end parts of the inclined pull steel strands (62) are adjustably connected with the upper part and/or the lower part of the middle upright post (3) through basket bolt pieces (63) or are adjustably connected through adjustable assemblies (25);

the adjustable assembly (25) comprises a U-shaped pipe (251), the opening end of the U-shaped pipe (251) is sleeved into the connecting block (252), the pull rope (26) penetrates through a pull rope hole in the middle of the connecting block (252) and then is fixed by a limiting nut, and the connecting block (252) is fixed by a locking nut after the connecting block (252) is moved to the required position of the U-shaped pipe (251).

6. The pre-stressed flexible photovoltaic anchor bracket of claim 2,

the middle upright post (3) comprises a hinged support (5), an upright post body (31) and a middle cross beam (32);

the lower end of the upright post body (31) is hinged with the hinged support (5) so that the upright post body (31) can swing on the hinged support (5) along the length direction of the steel cable (1);

the upper end of the upright post body (31) is provided with a middle cross beam (32), and the middle cross beam (32) is obliquely arranged at the upper end of the upright post body (31);

two ends of the middle cross beam (32) are respectively provided with a locking component (4) used for locking the steel cable (1);

the locking assembly (4) comprises a lock bottom plate (41) and two U-shaped bolts (42), the lock bottom plate (41) is fixedly connected with the middle cross beam (32), the U-shaped bolts (42) are arranged on two sides of the lock bottom plate (41), and the steel cable (1) penetrates through the space between the U-shaped bolts (42) and the lock bottom plate (41) and is locked on the lock bottom plate (41) by the U-shaped bolts (42);

or the locking component (4) is a U-shaped mounting piece fixedly mounted with the cross beam (32).

7. The prestressed flexible photovoltaic fixing support according to claim 6, wherein the intermediate beam (32) is fixedly connected with the column body (31), a first inclined strut (33) and a second inclined strut (34) are arranged between the intermediate beam (32) and the column body (31), and the intermediate beam (32), the first inclined strut (33) and the second inclined strut (34) form a triangular structure.

8. A prestressed flexible photovoltaic fixing support according to claim 1, characterized in that said end uprights (2) comprise:

the end upright post comprises an end upright post body (21), wherein a connecting support (23) is arranged at the upper end of the end upright post body (21), and an inclined mounting surface is formed on the top end surface of the connecting support (23);

and the end cross beam (22) is fixedly arranged on the inclined mounting surface of the connecting support (23), and two ends of the end cross beam (22) are used for respectively pulling the two steel cables (1).

9. A prestressed flexible photovoltaic fixing frame, according to claim 8, characterized in that the structure of said end cross-beams (22) pulling cables (1) is: two ends of the end beam (22) are provided with steel cable through holes (221), and the steel cable (1) penetrates through the steel cable through holes (221) and then is fixed;

or, reinforcing plates (28) are arranged at two ends of the end beam (22), a steel cable through hole (221) is formed in each reinforcing plate (28), and the steel cable (1) penetrates through the steel cable through hole (221) and then is fixed.

10. The prestressed flexible photovoltaic fixing support according to claim 8, further comprising two cable-stayed assemblies, wherein the upper ends of the two cable-stayed assemblies are respectively connected with two ends of the end beam (22), and the lower ends of the two cable-stayed assemblies are respectively connected with the end foundation; the cable-stayed assembly comprises a stay rope (26), the upper end of the stay rope (26) is connected with an upper support plate (24) on the end cross beam (22) through an adjustable assembly (25), and the lower end of the stay rope (26) is connected with a lower support (27) on the ground through the adjustable assembly (25);

the adjustable assembly (25) comprises a U-shaped pipe (251), the opening end of the U-shaped pipe (251) is sleeved into the connecting block (252), the pull rope (26) penetrates through a pull rope hole in the middle of the connecting block (252) and then is fixed by a limiting nut, and the connecting block (252) is fixed by a locking nut after the connecting block (252) is moved to the required position of the U-shaped pipe (251).

Images