Arc bending processing device for steel pipe

Abstract

The present invention discloses a bending processing device for steel pipes, which belongs to the technical field of pipe bending, and includes a bending mold and two electrically controlled guide rails. The bottom end of the bending mold is connected to a main bracket through a platform, and an adjustment component for adjusting the arc angle of the two electrically controlled guide rails is arranged on the main bracket. The inner wall of the electrically controlled guide rail is connected to a pressure seat through a T-shaped slider. The present invention can provide annular support and limit the inner wall of the end of the thin-walled steel pipe by setting an electrically controlled swivel and a tensioning plate, so as to avoid concave deformation caused by force during the process of applying pressure to the end of the pipe. At the same time, the setting of the buffer column and the electromagnetic seat can allow multiple buffer columns to be rigidly connected before the bending process, so as to facilitate the rapid introduction of the pipe for support. During the bending process, multiple buffer columns are flexibly supported by corrugated sleeves, so as to facilitate the multiple buffer columns to change with the pipe bending, so that the multiple buffer columns can be quickly pulled out after the pipe bending.

Description

Technical Field

[0001] The invention relates to the technical field of pipe bending, and in particular to a steel pipe bending processing device. Background Art

[0002] Steel pipe is a commonly used structural material with a wide range of applications and in a variety of shapes. Among them, curved steel pipe is a common and important type in the steel industry. It is commonly used in bridges, buildings, mechanical equipment and other industrial fields.

[0003] When a large-diameter steel pipe is bent, it is generally necessary to fix the two ends of the straight pipe, place the straight pipe on a machine tool platform, and press it on the arc-shaped mold plate to deform the large-diameter steel pipe under pressure. When the steel pipe is a thin-walled pipe, the pipe is very likely to be dented and deformed when subjected to external pressure. Currently, sand is generally filled in the pipe to prevent the pipe from being dented and deformed. However, the sand filling and unloading operations on the pipe make the bending of the thin-walled pipe more troublesome, affecting the processing efficiency of the pipe bending. In addition, when a large-diameter thin-walled pipe is bent, the two ends of the pipe are force application points, making the end of the pipe very susceptible to damage. Therefore, a steel pipe bending device is proposed. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the pipeline in the prior art is very likely to be dented and deformed when subjected to external pressure. At present, sand is generally filled in the pipeline to prevent the pipeline from being dented and deformed. However, the sand filling and unloading operations on the pipeline will make the bending processing of the thin-walled pipeline more troublesome, affecting the processing efficiency of the pipeline bending. In addition, when a large-diameter thin-walled pipeline is bent, the two ends of the pipeline are force application points, making the ends of the pipeline extremely susceptible to damage. A bending processing device for a steel pipe is proposed.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A bending processing device for steel pipes comprises an arc bending die and two electrically controlled guide rails, wherein the bottom end of the arc bending die is connected to a main bracket via a platform, and an adjustment component for adjusting the arc angle of the two electrically controlled guide rails is arranged on the main bracket, and the inner wall of the electrically controlled guide rail is connected to a pressure seat via a T-shaped slider, and the inward end of the pressure seat is provided with a tensioning component for limiting and protecting the end of the pipe, and a plurality of buffer columns are arranged on the inward side of the tensioning component, and a plurality of buffer pads arranged in a ring array are connected to the outer wall of the buffer column, and one end of the buffer column is connected to an electromagnetic seat for facilitating front and rear docking via a sliding rod, and the other end of the buffer column is connected to a fastening component for limiting the front and rear buffer columns after docking via a magnetic column.

[0007] Preferably, the bottom end of the bending mold is fixedly connected to the top of one end of the main bracket through a platform, and the two electric control guide rails are located on the top of the platform.

[0008] Preferably, the adjustment assembly consists of a double-sided rack and two adjustment gears, the double-sided rack is respectively meshed with two adjustment gears located on both sides, the top of the main bracket is fixedly connected to one end of the double-sided rack through an electric push rod, the adjustment gear is fixedly connected to the adjustment bracket through a fixed shaft, the side wall of the main bracket is movably connected to the adjustment bracket through a steering rod, and the top of the adjustment bracket is fixedly connected to the bottom end of the electric control guide rail.

[0009] Preferably, the inner side wall of the electric control guide rail is slidably connected to the side wall of the T-shaped slider, and the top end of the T-shaped slider is fixedly connected to the bottom end of the pressure seat through a hydraulic rod.

[0010] Preferably, the tensioning assembly consists of an electrically controlled rotating ring and a plurality of tensioning plates, the inner side wall of the electrically controlled rotating ring is rotatably connected to a plurality of tensioning arc rods, and the other end of the tensioning arc rod is rotatably connected to the bottom end surface of the tensioning plate.

[0011] Preferably, the tensioning plate is rotatably connected to the inner ring via a pin shaft, an annular groove is provided on the inner side wall of the electrically controlled rotating ring, and the inner ring end face is fixedly connected to the inner side wall of the annular groove provided on the inner side wall of the electrically controlled rotating ring.

[0012] Preferably, the internal cavity of the buffer column is interconnected with multiple buffer pads, and storage grooves are opened at both ends of the buffer column. Multiple steering buttons are fixedly connected to the inner side walls of the storage grooves. A right docking column is fixedly connected to the inner end surface of the storage groove at one end of the buffer column, and a left docking column is fixedly connected to the inner end surface of the storage groove at the other end of the buffer column.

[0013] Preferably, the ends of the right docking column and the left docking column are fixedly connected with corrugated sleeves, the right docking column is slidably connected to the end of the electromagnetic seat through a sliding rod, and a return spring is sleeved on the outer side wall of the sliding rod.

[0014] Preferably, the fastening assembly is composed of multiple right-angle plates and multiple limit plates, the end of the left docking column is fixedly connected to the end of the magnetic column, one end of the right-angle plate is fixedly connected to the other end of the magnetic column, the other end of the right-angle plate is rotatably connected to the limit plate through a rotating shaft, the side wall of the limit plate is fixedly connected to the side wall of the skateboard through a rubber pull rod, the other symmetrical side wall of the skateboard is fixedly connected with an electric control pull rod, and the skateboard is slidably connected to the side wall of the right-angle plate.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. This scheme, through the setting of double-sided racks and adjusting gears, can facilitate the arc sliding of the subsequent pressure seat on the electric control guide rail, compensate for the angle and distance when applying pressure to the two ends of the thin-walled steel pipe, and avoid the two ends of the thin-walled steel pipe being subjected to tension due to angle changes during the pressure process.

[0017] 2. This scheme can provide annular support and limit the inner wall of the end of the thin-walled steel pipe through the setting of the electric control swivel and the tensioning plate, avoiding the concave deformation caused by the force when the pipe end is pressed, and ensuring the safety of the pipe end during the bending process.

[0018] 3. Through the setting of buffer columns and electromagnetic seats, this scheme can make multiple buffer columns rigidly connected before the arc bending process, which is convenient for quickly passing the pipeline for support. During the arc bending process, multiple buffer columns are flexibly supported by corrugated sleeves, which is convenient for multiple buffer columns to change with the arc of the pipeline, so that multiple buffer columns can be quickly pulled out after the pipeline is bent. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the three-dimensional structure of a steel pipe bending arc processing device proposed by the present invention Figure 1 ;

[0020] Figure 2 A schematic diagram of the three-dimensional structure of a steel pipe bending arc processing device proposed by the present invention Figure 2 ;

[0021] Figure 3 This is a structural schematic diagram of a double-sided rack and an adjusting gear position in a steel pipe bending processing device proposed by the present invention;

[0022] Figure 4 This is a schematic structural diagram of a steel pipe bending device proposed by the present invention in which multiple tensioning plates are in a closed state;

[0023] Figure 5 This is a structural schematic diagram of a plurality of tensioning plates in an arc bending processing device for a steel pipe proposed by the present invention in an expanded state;

[0024] Figure 6 This is a schematic structural diagram of the front and rear ends of a buffer column in a steel pipe bending processing device proposed by the present invention;

[0025] Figure 7 This is a schematic diagram of the structure inside a corrugated sleeve in a steel pipe bending processing device proposed by the present invention;

[0026] Figure 8 for Figure 7 Enlarged view of point A in the middle.

[0027] In the figure: 1. bending mold; 2. electric control guide rail; 3. platform; 4. main bracket; 5. electric push rod; 6. double-sided rack; 7. adjusting gear; 8. steering rod; 9. adjusting bracket; 10. T-shaped slider; 11. hydraulic rod; 12. pressure seat; 13. electric control swivel; 14. tensioning arc rod; 15. pin shaft; 16. inner ring; 17. tensioning plate; 18. buffer column; 19. buffer pad; 20. steering button; 21. right docking column; 22. left docking column; 23. corrugated sleeve; 24. electromagnetic seat; 25. reset spring; 26. magnetic column; 27. right angle plate; 28. electric control pull rod; 29. ​​slide plate; 30. rubber pull rod; 31. limit plate. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] Embodiment 1, refer to Figure 1-Figure 8 , a bending device for steel pipes, comprising a bending die 1 and two electric control rails 2, the bottom end of the bending die 1 is connected to a main bracket 4 through a platform 3, and the main bracket 4 is provided with an adjustment component for adjusting the arc angle of the two electric control rails 2;

[0030] Furthermore, the bottom end of the bending mold 1 is fixedly connected to the top of one end of the main bracket 4 through the platform 3, the two electric control rails 2 are located on the top of the platform 3, the adjustment component is composed of a double-sided rack 6 and two adjustment gears 7, the double-sided rack 6 is respectively meshed with the two adjustment gears 7 located on both sides, the top of the main bracket 4 is fixedly connected to one end of the double-sided rack 6 through the electric push rod 5, the adjustment gear 7 is fixedly connected to the adjustment bracket 9 through a fixed shaft, the side wall of the main bracket 4 is movably connected to the adjustment bracket 9 through a steering rod 8, and the top of the adjustment bracket 9 is fixedly connected to the bottom end of the electric control rail 2;

[0031] It should be noted that: the thin-walled steel pipe to be bent is placed on the top of the platform 3, and then the T-shaped slider 10 is used to slide on the electric control guide rail 2 to drive the two pressure seats 12 to move toward each other, and multiple buffer columns 18 and buffer pads 19 are pushed into the thin-walled steel pipe, and then the electric push rod 5 on the main bracket 4 is started to push the double-sided rack 6 to move. The movement of the double-sided rack 6 will drive the two adjusting gears 7 on both sides to rotate, and the adjusting gear 7 will drive the two electric control guide rails 2 to have an angular offset through the adjusting bracket 9;

[0032] A further advantage of adopting the above method is that it can facilitate the subsequent arc sliding of the pressure seat 12 on the electric control guide rail 2, compensate for the angle and distance when applying pressure to the two ends of the thin-walled steel pipe, and avoid the two ends of the thin-walled steel pipe being subjected to tension due to angle changes during the pressure process.

[0033] Example 2, reference Figure 1-Figure 8 The inner wall of the electric control guide rail 2 is connected to a pressure seat 12 through a T-shaped slider 10, and the inner end of the pressure seat 12 is provided with a tensioning component for limiting and protecting the end of the pipeline;

[0034] Furthermore, the inner wall of the electric control guide rail 2 is slidably connected to the side wall of the T-shaped slider 10, the top of the T-shaped slider 10 is fixedly connected to the bottom end of the pressure seat 12 through the hydraulic rod 11, the tensioning assembly is composed of an electric control swivel 13 and a plurality of tensioning plates 17, the inner wall of the electric control swivel 13 is rotatably connected to a plurality of tensioning arc rods 14, the other end of the tensioning arc rod 14 is rotatably connected to the bottom end surface of the tensioning plate 17, the tensioning plate 17 is rotatably connected to the inner ring 16 through the pin 15, an annular groove is provided on the inner wall of the electric control swivel 13, and the end surface of the inner ring 16 is fixedly connected to the inner wall of the annular groove provided on the inner wall of the electric control swivel 13;

[0035] It should be noted that: after the two ends of the thin-walled steel pipe are inserted into the two pressure seats 12, the electric control swivel 13 is started to rotate, and the rotation of the electric control swivel 13 will cause the multiple tension arc rods 14 to rotate accordingly, and the change in the rotation angle of the tension arc rod 14 will cause the tension plate 17 to rotate on the pin 15, thereby controlling the mutual gathering and expansion of the multiple tension plates 17, and the multiple tension plates 17 will press on the inner wall of the end of the thin-walled steel pipe after opening;

[0036] A further advantage of adopting the above method is that it can provide annular support and limit the inner wall of the end of the thin-walled steel pipe, avoiding concave deformation caused by force during the process of applying pressure to the pipe end, thereby ensuring the safety of the pipe end during the bending process.

[0037] Example 3, reference Figure 1-Figure 8 A plurality of buffer columns 18 are arranged on the inner side of the tensioning assembly, and a plurality of buffer pads 19 arranged in a ring array are connected to the outer wall of the buffer column 18. One end of the buffer column 18 is connected to an electromagnetic seat 24 for facilitating front and rear docking through a sliding rod, and the other end of the buffer column 18 is connected to a fastening assembly for docking the front and rear buffer columns 18 through a magnetic column 26;

[0038] Furthermore, the internal cavity of the buffer column 18 is interconnected with a plurality of buffer pads 19, and a receiving groove is provided at both ends of the buffer column 18, and a plurality of steering buttons 20 are fixedly connected to the inner side wall of the receiving groove, a right docking column 21 is fixedly connected to the inner end surface of the receiving groove at one end of the buffer column 18, and a left docking column 22 is fixedly connected to the inner end surface of the receiving groove at the other end of the buffer column 18, and the ends of the right docking column 21 and the left docking column 22 are fixedly connected to the corrugated sleeve 23, and the right docking column 21 is slidably connected to the end of the electromagnetic seat 24 through a sliding rod, and the outer side of the sliding rod A return spring 25 is sleeved on the side wall, and the fastening assembly is composed of a plurality of right-angle plates 27 and a plurality of limit plates 31. The end of the left docking column 22 is fixedly connected to the end of the magnetic column 26, one end of the right-angle plate 27 is fixedly connected to the other end of the magnetic column 26, and the other end of the right-angle plate 27 is rotatably connected to the limit plate 31 through a rotating shaft. The side wall of the limit plate 31 is fixedly connected to the side wall of the slide plate 29 through a rubber pull rod 30, and the other symmetrical side wall of the slide plate 29 is fixedly connected to the electric control pull rod 28, and the slide plate 29 is slidably connected to the side wall of the right-angle plate 27;

[0039] It should be noted that: before the buffer column 18 and the buffer pad 19 are pushed into the interior of the pipe, the electromagnetic seat 24 is energized so that the electromagnetic seat 24 is magnetic, and the electromagnetic seat 24 pulls the reset spring 25 to move through the slide bar, so that the electromagnetic seat 24 and the magnetic column 26 are magnetically attracted to each other. In the process of the electromagnetic seat 24 and the magnetic column 26 being magnetically attracted to each other, the multiple right-angle plates 27 will drive the multiple limit plates 31 to move and press into the flat end of the electromagnetic seat 24. The electric control pull rod 28 is used to push the slide plate 29, and the rubber pull rod 30 drives the limit plate 31 to rotate, so that the multiple limit plates 31 will be limited and stuck on the flat end of the electromagnetic seat 24, so as to realize multiple buffers. The rigid connection of the punch column 18 facilitates the pressure seat 12 to push the buffer column 18 into the pipeline, and then cancel the power supply to the electromagnetic seat 24, and let the limit plate 31 rotate under the tension to cancel the limit, so that the electromagnetic seat 24 slides and resets under the action of the reset spring 25, and the two buffer columns 18 will become a flexible connection between the corrugated sleeves 23. In the process of bending, multiple buffer pads 19 cooperate with the buffer column 18 to support the inner wall of the steel pipe to prevent the steel pipe from being concave and deformed. The flexible connection of the corrugated sleeve 23 facilitates the bending arrangement of multiple buffer columns 18 along the pipe bending arc, and also facilitates the quick removal of the buffer column 18 after the bending arc processing;

[0040] A further advantage of adopting the above method is that before the bending process, multiple buffer columns 18 can be rigidly connected to facilitate the rapid insertion of the pipeline for support. During the bending process, multiple buffer columns 18 are flexibly supported by the corrugated sleeve 23, which facilitates the multiple buffer columns 18 to change with the bending of the pipeline, so that multiple buffer columns 18 can be quickly pulled out after the pipeline is bent.

[0041] When the present invention is in use, the thin-walled steel pipe to be bent is placed on the top of the platform 3, and then the T-shaped slider 10 is used to slide on the electric control guide rail 2 to drive the two pressure seats 12 to move toward each other, and multiple buffer columns 18 and buffer pads 19 are pushed into the thin-walled steel pipe. Then, the electric push rod 5 on the main bracket 4 is started to push the double-sided rack 6 to move. The movement of the double-sided rack 6 will drive the two adjusting gears 7 on both sides to rotate, and the adjusting gear 7 will drive the two electric control guide rails 2 to offset the angle through the adjusting bracket 9, so that the subsequent arc sliding of the pressure seat 12 on the electric control guide rail 2 can be facilitated, and the angle and distance compensation when the pressure is applied to the two ends of the thin-walled steel pipe can be avoided. The two ends of the thin-walled steel pipe are subject to tension due to angle changes during the pressure process;

[0042] After the two ends of the thin-walled steel pipe are inserted into the two pressure seats 12, the electric control swivel 13 is started to rotate. The rotation of the electric control swivel 13 will cause the multiple tension arc rods 14 to rotate accordingly. The change in the rotation angle of the tension arc rod 14 will cause the tension plate 17 to rotate on the pin 15, thereby controlling the mutual gathering and expansion of the multiple tension plates 17. After the multiple tension plates 17 are opened, they will press on the inner side wall of the end of the thin-walled steel pipe, so that the inner wall of the end of the thin-walled steel pipe can be annularly supported and limited, avoiding the concave deformation caused by the force during the pressure application process on the pipe end, and ensuring the safety of the pipe end during the bending process;

[0043] Before the buffer column 18 and the buffer pad 19 are pushed into the interior of the pipeline, the electromagnetic seat 24 is energized so that the electromagnetic seat 24 is magnetic. The electromagnetic seat 24 then pulls the reset spring 25 to move through the sliding rod, so that the electromagnetic seat 24 and the magnetic column 26 are magnetically attracted to each other. During the process of the electromagnetic seat 24 and the magnetic column 26 being magnetically attracted to each other, the multiple right-angle plates 27 will drive the multiple limit plates 31 to move and press into the flat end of the electromagnetic seat 24. The electric-controlled pull rod 28 is used to push the slide plate 29, so that the rubber pull rod 30 drives the limit plate 31 to rotate. Then, the multiple limit plates 31 will be limited and stuck in the flat end of the electromagnetic seat 24, thereby realizing the rigid connection of the multiple buffer columns 18, making it easier for the pressure seat 12 to push the buffer column 18 into the pipeline. Then, the energization of the electromagnetic seat 24 is canceled, and the limit plate 31 is pulled and rotated to cancel. The limit makes the electromagnetic seat 24 slide and reset under the action of the reset spring 25, and the two buffer columns 18 will become a flexible connection between the corrugated sleeves 23. During the bending process, multiple buffer pads 19 cooperate with the buffer column 18 to support the inner wall of the steel pipe to prevent the steel pipe from being concave and deformed. The flexible connection of the corrugated sleeve 23 facilitates the bending arrangement of multiple buffer columns 18 along the pipe bend, and also facilitates the rapid removal of the buffer column 18 after the bending process. In this way, multiple buffer columns 18 can be rigidly connected before the bending process, which is convenient for quickly passing into the pipe for support. During the bending process, multiple buffer columns 18 are flexibly supported by the corrugated sleeve 23, which is convenient for multiple buffer columns 18 to change with the pipe bend, so that multiple buffer columns 18 can be quickly pulled out after the pipe bends.

[0044] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A bending device for a steel pipe, comprising a bending die (1) and two electrically controlled guide rails (2), characterized in that: The bottom end of the arc bending mold (1) is connected to a main bracket (4) via a platform (3); the main bracket (4) is provided with an adjustment component for adjusting the arc angle of the two electrically controlled guide rails (2); The inner side wall of the electric control guide rail (2) is connected to a pressure seat (12) via a T-shaped slider (10); the inner end of the pressure seat (12) is provided with a tensioning assembly for limiting and protecting the end of the pipeline; a plurality of buffer columns (18) are provided on the inner side of the tensioning assembly; a plurality of buffer pads (19) arranged in a ring array are connected to the outer side wall of the buffer column (18); one end of the buffer column (18) is connected to an electromagnetic seat (24) for facilitating front and rear docking via a slide rod; the other end of the buffer column (18) is connected to a fastening assembly for docking the two front and rear buffer columns (18) via a magnetic column (26); and a right docking column (21) and a left docking column (22) are provided at both ends of the buffer column (18); The adjustment component is composed of a double-sided rack (6) and two adjustment gears (7), the double-sided rack (6) is respectively meshed with two adjustment gears (7) located on both sides, the top of the main bracket (4) is fixedly connected to one end of the double-sided rack (6) through an electric push rod (5), the adjustment gear (7) is fixedly connected to the adjustment bracket (9) through a fixed shaft, the side wall of the main bracket (4) is movably connected to the adjustment bracket (9) through a steering rod (8), the top of the adjustment bracket (9) is fixedly connected to the bottom end of the electric control guide rail (2), the tensioning component is composed of an electric control rotating ring (13) and a plurality of tensioning arc rods (14), the inner side wall of the electric control rotating ring (13) is rotatably connected to a plurality of tensioning arc rods (14), the other end of the tensioning arc rod (14) is rotatably connected to the bottom end surface of the tensioning plate (17), the right docking column (21) and The ends of the left docking column (22) are fixedly connected with a corrugated sleeve (23), the right docking column (21) is slidably connected with the end of the electromagnetic seat (24) through a sliding rod, and a return spring (25) is sleeved on the outer wall of the sliding rod. The fastening assembly consists of a plurality of right-angle plates (27) and a plurality of limit plates (31). The end of the left docking column (22) is fixedly connected with the end of the magnetic column (26), one end of the right-angle plate (27) is fixedly connected with the other end of the magnetic column (26), and the other end of the right-angle plate (27) is rotatably connected with the limit plate (31) through a rotating shaft. The side wall of the limit plate (31) is fixedly connected with the side wall of the slide plate (29) through a rubber pull rod (30), and the other symmetrical side wall of the slide plate (29) is fixedly connected with an electric control pull rod (28), and the slide plate (29) is slidably connected with the side wall of the right-angle plate (27).

2. The steel pipe bending device according to claim 1, characterized in that: The bottom end of the bending mold (1) is fixedly connected to the top of one end of the main bracket (4) via a platform (3), and the two electric control guide rails (2) are located on the top of the platform (3).

3. The steel pipe bending device according to claim 1, characterized in that: The inner side wall of the electric control guide rail (2) is slidably connected to the side wall of the T-shaped slider (10), and the top end of the T-shaped slider (10) is fixedly connected to the bottom end of the pressure seat (12) via a hydraulic rod (11).

4. The steel pipe bending device according to claim 1, characterized in that: The tensioning plate (17) is rotatably connected to the inner ring (16) via a pin shaft (15); an annular groove is provided on the inner side wall of the electrically controlled rotating ring (13); and the end surface of the inner ring (16) is fixedly connected to the inner side wall of the annular groove provided on the inner side wall of the electrically controlled rotating ring (13).

5. The steel pipe bending device according to claim 1, characterized in that: The internal cavity of the buffer column (18) is in communication with a plurality of buffer pads (19); both ends of the buffer column (18) are provided with receiving grooves; the inner side walls of the receiving grooves are fixedly connected to a plurality of steering knobs (20); the inner end surface of the receiving groove at one end of the buffer column (18) is fixedly connected to a right docking column (21); and the inner end surface of the receiving groove at the other end of the buffer column (18) is fixedly connected to a left docking column (22).

Images