Multifunctional limit simulation device

Abstract

The multifunctional limit simulation device of the present invention includes a chassis, a support frame, a simulation track device, a tunnel height simulation device, and a vehicle side simulation device. The simulation track device is arranged inside the chassis, and the support frame is connected to the chassis. The support frame has a gantry frame structure and includes two side columns, a main crossbeam, and a sliding frame. The bottom ends of the two side columns are respectively connected to the chassis. The sliding frame includes a sliding frame crossbeam and a sliding frame vertical rod. The sliding frame is arranged as a whole inside the two side columns and the main crossbeam. The side columns are connected to the inside of the side columns. The sliding frame vertical rod is connected to a slider that can cooperate with the sliding rail. The sliding frame drive device can drive the entire sliding frame to move up and down relative to the two side columns and the main crossbeam. The tunnel height simulation device and the vehicle side simulation device are respectively connected to the sliding frame. The present invention can simulate various limit profile sizes, can automatically simulate the superelevation state of the track, and automatically move and position the simulation device. The work efficiency is high and the labor intensity is low.

Description

Technical Field

[0001] The invention relates to a railway clearance simulation device, in particular to a multifunctional clearance simulation device. Background Art

[0002] Limit refers to the outline dimension line that is not allowed to be exceeded for locomotives and vehicles and buildings and equipment close to the line in order to ensure the safety of locomotives and vehicles running on railway lines and prevent locomotives and vehicles from colliding with buildings and equipment on adjacent lines. The limit simulation device is an experimental device used to simulate limits. The current limit simulation device includes a simulated track device, a height simulation device and a lateral simulation device. The height simulation device is set on the upper side of the simulated track device through a bracket, and the lateral simulation device is set on the side of the simulated track device through a bracket. The above limit simulation device has the following defects: the position of the simulated track device is fixed. When the simulated track tilts to one side, it is necessary to manually use a pad device to adjust the track tilt; the height simulation device and the lateral simulation device are fixed, and it is difficult to simulate the limit outline dimensions of different heights and widths. Manually adjusting or replacing the height simulation device and the lateral simulation device has low work efficiency and high labor intensity, and it is difficult to quickly detect the indication errors of various limit measuring devices. Summary of the Invention

[0003] The purpose of the present invention is to address the defects of the above-mentioned prior art and provide a multifunctional limit simulation device that can simulate various limit profile sizes, automatically simulate the track superelevation state, and automatically move and position part of the simulation device, with high work efficiency and low labor intensity.

[0004] The technical solution adopted by the present invention to achieve the above-mentioned purpose is: a multifunctional limit simulation device, including an underframe, a support frame, a simulation track device, a tunnel height simulation device, and a vehicle side simulation device. The simulation track device is arranged on the inner side of the underframe, the support frame is connected to the underframe, the tunnel height simulation device and the vehicle side simulation device are respectively connected to the support frame, and the support frame is a gantry frame structure. The support frame includes two side columns and a main crossbeam connected to the top of the two side columns. The bottom ends of the two side columns are respectively connected to the two sides of the underframe. The support frame also includes a sliding frame, and the sliding frame is connected to a sliding frame driving device. The frame includes a sliding frame crossbeam and a sliding frame vertical rod vertically connected to the lower sides of both ends of the sliding frame crossbeam. The sliding frame is arranged on the inner sides of the two side columns and the main crossbeam as a whole. The inner surfaces of the two side columns are respectively connected with slide rails. The outer surfaces of the two sliding frame vertical rods are connected with sliders that can cooperate with the slide rails. The sliding frame driving device is arranged outside a side column and on the main crossbeam. The sliding frame driving device can drive the sliding frame as a whole to move up and down relative to the two side columns and the main crossbeam. The tunnel height simulation device is connected to the lower side of the sliding frame crossbeam, and the vehicle side simulation device is obliquely connected between the sliding frame crossbeam and the sliding frame vertical rod.

[0005] A further technical solution of the present invention is: the sliding frame driving device includes a winch, a guide pulley and a lifting pulley, the winch is installed on the outside of one of the side columns, the winch is a double-drum winch with two synchronous drums, the two ends of the sliding frame beam are respectively connected to the lifting pulleys, the bottom ends of the main beams on the upper side of the lifting pulleys are respectively connected to fixed connection ears, two sets of guide pulleys are installed on the main beams, the steel wire ropes of the winch pass upward through the corresponding guide pulleys and then downward through the corresponding lifting pulleys, and then extend upward and are fixedly connected to the corresponding fixed connection ears.

[0006] A further technical solution of the present invention is: the outer surfaces of the two side columns are respectively installed with multiple groups of electrically controlled positioning devices with corresponding positions, and the electrically controlled positioning devices include a mounting bracket, a positioning pin, and a linear motor. The mounting bracket is installed on the outer surface of the side column, and a through hole I is provided in the middle of the mounting bracket. The side column is provided with a through hole II that penetrates its inner and outer surfaces and the slide rail groove at the position corresponding to through hole I. The positioning pin is positioned in through hole I and through hole II. The linear motor is installed in the mounting bracket and its output shaft is connected to the outer end of the positioning pin. When the linear motor is working, it can push the positioning pin to slide inward to block the slider connected to the vertical rod of the sliding frame from sliding downward, thereby positioning the sliding frame.

[0007] A further technical solution of the present invention is that the positioning pin is a conical pin with a larger outer side and a smaller inner side, and the through hole II is a conical hole with a larger outer side and a smaller inner side.

[0008] A further technical solution of the present invention is: the simulated track device includes a track support base, an articulated seat, a track support frame, an electric push rod, a left track and a right track, the track support base is arranged on the inner side of the base frame, and a pair of articulated seats are connected to the upper right end of the track support base. The right side of the track support frame is hinged to the articulated seat through a hinge device, and the left track and the right track are connected to the track support frame in parallel with each other. The bottom end of the electric push rod is installed on the lower left side of the track support base, and the upper end of the electric push rod extends upward and is connected to the lower left side of the track support frame. The electric push rod can push the left side of the track support frame upward, so that the track support frame and the left and right tracks connected thereto swing to the upper left relative to the articulated seat, thereby achieving the simulated track super-elevation state.

[0009] A further technical solution of the present invention is: it also includes a contact network simulation device and a tunnel side simulation device, the upper end of the contact network simulation device is connected to the middle position of the sliding frame crossbeam, the lower end of the contact network simulation device is connected to the inner surface of one of the sliding frame vertical rods, and the tunnel side simulation device is connected to the inner surface of one of the sliding frame vertical rods.

[0010] A further technical solution of the present invention is that a vehicle width simulation device is connected to the inner surface of the side column on the side away from the simulation track device.

[0011] A further technical solution of the present invention is: a pillar side simulation device is connected to the bottom end of the inner side of the side column away from the side of the simulation track device, and a pillar side limit adjustment device capable of adjusting the position of the pillar side simulation device is also connected between the pillar side simulation device and the side column to which it is connected.

[0012] A further technical solution of the present invention is: the base frame is a rectangular frame structure, the base frame includes two wide bottom edges and two long bottom edges connected between the two wide bottom edges, the bottom ends of the two side columns are respectively connected to the two wide bottom edges, diagonal braces and reinforcement plates are connected between the side columns and the wide bottom edges, and stabilizing ropes are respectively connected between the two sides of the top of the side columns and the two sides of the wide bottom edges.

[0013] The multifunctional limit simulation device of the present invention has the following beneficial effects:

[0014] 1. A tunnel height simulation device and a contact network simulation device are installed on the top, and a vehicle side simulation device, a tunnel side simulation device, a vehicle width simulation device, and a pillar side simulation device are installed on the side. These devices can simulate various clearance profile sizes and are used to detect the indication errors of various clearance measuring devices.

[0015] 2. The support frame adopts a gantry frame structure, with a sliding frame set inside the support frame. The sliding frame driving device drives the sliding frame to move up and down relative to the support frame. The tunnel height simulation device, vehicle side simulation device, contact network simulation device, and tunnel side simulation device connected to the sliding frame can move up and down with the sliding frame. An electric control positioning device that can locate the position of the sliding frame is set on the outside of the side column. The sliding frame can realize automatic movement and automatic positioning, and there is no need for workers to adjust the position of the simulation device on the sliding frame, which reduces the labor intensity of the operator and improves the detection efficiency.

[0016] 3. The positioning pins of the electric control positioning device on the outside of the two side columns are made of conical pins and tapered holes. They are automatically positioned and locked by the electric control device, which can effectively ensure the repeatability of the positioning of the sliding frame drive device after shifting;

[0017] 4. The base frame adopts a rectangular frame structure, and diagonal braces, reinforcement plates, stabilizing ropes and other structures are connected between the side columns and the wide bottom edge of the base frame. The two diagonal braces, stabilizing ropes and side columns form a large triangle, and the stability of the triangle is used to ensure the stability of the entire gantry frame.

[0018] 5. The simulated track device connects the left and right tracks to the same track support frame. The electric push rod can push the track support frame to swing to the upper left relative to the right hinged seat to achieve track gauge and superelevation changes without the need for workers to lift, reducing the operator's labor intensity and improving detection efficiency.

[0019] The multifunctional limit simulation device of the present invention will be further described below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a front view of the multifunctional limit simulation device of the present invention;

[0021] Figure 2 is a side view of the multifunctional limit simulation device of the present invention;

[0022] Figure 3 It is a perspective view of the multifunctional limit simulation device of the present invention;

[0023] Figure 4 yes Figure 1 A local enlarged view of point A;

[0024] Figure 5 yes Figure 3 A local enlarged view of point A;

[0025] Figure 6 yes Figure 3 A magnified view of the simulated track assembly;

[0026] Figure 7 yes Figure 3 An enlarged view of the connection between the center pillar side limit adjustment device and the pillar side simulation device;

[0027] Explanation of the accompanying numbers: 1-underframe, 2-reinforcement plate, 3-side column, 4-electrically controlled positioning device, 5-main beam, 6-vehicle side simulation device, 7-guide pulley, 8-wire rope, 9-sliding frame, 10-tunnel height simulation device, 11-contact network simulation device, 12-fixed connection ear, 13-lifting pulley, 14-tunnel side simulation device, 15-winch, 16-vehicle width simulation device, 17-pillar side limit adjustment device, 18-pillar side simulation device, 1 9-Simulation track device, 20-Electric push rod, 21-Stabilizing rope, 22-Diagonal brace, 23-Sliding frame crossbeam, 24-Sliding frame vertical rod, 25-Slider, 26-Slide rail, 27-Main beam diagonal brace, 28-Wide bottom edge, 29-Long bottom edge, 30-Location pin, 31-Mounting bracket, 32-Linear motor, 33-Track support base, 34-Hinged seat, 35-Right track, 36-Track support frame, 37-Left track, 38-Location screw, 39-Location column, 40-Sliding rod. DETAILED DESCRIPTION

[0028] like Figures 1 to 3As shown, the multifunctional limit simulation device of the present invention includes a chassis 1, a support frame, a simulation track device 19, a tunnel height simulation device 10, a vehicle side simulation device 6, a contact network simulation device 11 and a tunnel side simulation device 14, the simulation track device 19 is arranged on the inner side of the chassis 1, the support frame is connected to the chassis 1, and the tunnel height simulation device 10, the vehicle side simulation device 6, the contact network simulation device 11 and the tunnel side simulation device 14 are respectively connected to the support frame.

[0029] like Figure 1 、 Figure 3 As shown, the support frame has a gantry-style frame structure and comprises two side columns 3 and a main beam 5 connected to the tops of the two side columns 3. Main beam diagonal braces 27 are also connected between the ends of the main beam 5 and the tops of the side columns 3. The bottom ends of the two side columns 3 are respectively connected to the sides of the base frame 1. The support frame also includes a sliding frame 9, to which a sliding frame drive device is connected. The sliding frame 9 comprises a sliding frame crossbeam 23 and a sliding frame vertical rod 24 perpendicularly connected to the underside of each end of the sliding frame crossbeam 23. The sliding frame 9 is integrally mounted inside the two side columns 3 and the main beam 5. Slide rails 26 are connected to the inner surfaces of the two side columns 3, and sliders 25 that interact with the slide rails 26 are connected to the outer surfaces of the two sliding frame vertical rods 24. The sliding frame drive device is mounted outside one of the side columns 3 and on the main beam 5, and is capable of driving the entire sliding frame 9 up and down relative to the two side columns 3 and the main beam 5. In this embodiment, the carriage drive device includes a winch 15, a guide pulley 7, and a lifting pulley 13. The winch 15 is mounted on the outside of the right side column 3. It is a dual-drum winch equipped with two synchronized drums. The lifting pulleys 13 are connected to both ends of the upper surface of the carriage crossbeam 23. The bottom end of the main crossbeam 5, above the lifting pulleys 13, is connected to fixed lugs 12. Two sets of guide pulleys 7 are mounted on the main crossbeam 5. The wire rope 8 of the winch 15 passes upward over the corresponding guide pulley 7, then downward over the corresponding lifting pulley 13, before extending upward and being fixedly connected to the corresponding fixed lug 12. During operation, the two drums of the winch 15 operate synchronously, controlling the smooth vertical movement of the carriage 9 between the two side columns 3, with a travel distance of up to 2100 mm. The tunnel height simulator 10 is connected to the underside of the carriage crossbeam 23. The vehicle side simulator 6 is connected at an angle between the carriage crossbeam 23 and the carriage vertical rod 24. The upper end of the catenary simulator 11 is connected to the middle of the carriage crossbeam 23. The lower end of the catenary simulator 11 is connected to the inner surface of one of the carriage vertical rods 24. The tunnel side simulator 14 is connected to the inner surface of one of the carriage vertical rods 24. The tunnel height simulator 10, vehicle side simulator 6, catenary simulator 11, and tunnel side simulator 14 can slide up and down along with the carriage 9, making it easy to detect the indication error of the corresponding clearance measuring device.

[0030] like Figures 1 to 3 As shown, the chassis 1 is a rectangular frame structure, comprising two wide bases 28 and two long bases 29 connected between the two wide bases 28. The wide bases 28 and the long bases 29 are both made of channel steel, with the channel opening facing downward. The width of the wide base 28 is greater than the width of the long base 29. Connection holes can be provided in the end side panels of the wide bases 28 and the long bases 29, and then bolted together to form a whole. Alternatively, connecting plates with connection holes can be welded to the ends of the wide bases 28 and the long bases 29, and then bolted together to form a whole. The bottom ends of the two side columns 3 are respectively connected to the upper surfaces of the two wide bases 28. The bottom ends of the side columns 3 are connected to connecting plates with connection holes. The connecting plates are provided with connection holes. The wide bases 28 have corresponding connection holes. Bolts pass through the corresponding connection holes to secure the side columns 3 to the upper surfaces of the wide bases 28. Diagonal braces 22 and reinforcement plates 2 are connected between the side columns 3 and the wide bottom edge 28, and stabilizing ropes 21 are respectively connected between the top sides of the side columns 3 and the sides of the wide bottom edge 28. The diagonal braces 22, reinforcement plates 2 and stabilizing ropes 21 can effectively improve the stability of the support frame and the base frame 1.

[0031] like Figures 1 to 5 As shown, multiple sets of electrically controlled positioning devices 4 with corresponding positions are mounted on the outer surfaces of the two side columns 3. In this embodiment, four sets of electrically controlled positioning devices 4 with corresponding positions are provided. The electrically controlled positioning devices 4 include a mounting bracket 31, a positioning pin 30, and a linear motor 32. The mounting bracket 31 is mounted on the outer surface of the side column 3. A through hole I is provided in the center of the mounting bracket 31. A through hole II, corresponding to the position of through hole I, is provided on the side column 3, extending through its inner and outer surfaces and the guide rail slot. The positioning pin 30 is positioned in through hole I and through hole II. The positioning pin 30 is a conical pin with a larger outer side and a smaller inner side, while through hole II is a conical hole with a larger outer side and a smaller inner side. The linear motor 32 is mounted in the mounting bracket 31, and its output shaft is connected to the outer ends of the positioning pins 30. When the linear motor 32 is in operation, it pushes the positioning pin 30 inward to block the downward movement of the slider 25 connected to the vertical rod 24 of the slide frame, thereby positioning the slide frame 9. When the sliding frame 9 moves to a predetermined position, the electronically controlled positioning device 4 can realize automatic positioning, and workers do not need to adjust the position of the simulation device on the sliding frame 9, which can reduce the labor intensity of the operator and improve the detection efficiency.

[0032] like Figures 1 to 3 and Figure 6As shown, the simulated track assembly 19 includes a track support base 33, an articulated base 34, a track support frame 36, an electric push rod 20, a left track 37, and a right track 35. The track support base 33 is positioned inside the base frame 1, and the track support base is placed on the ground. A pair of articulated bases 34 are connected to the upper right end of the track support base 33. The right ends of the track support frame 36 are hinged to the articulated bases 34 via an articulated assembly, allowing the track support frame 36 to swing upward and downward relative to the articulated bases 34. The left track 37 and the right track 35 are connected to the track support frame 36 in parallel. The position of the left track 37 on the track support frame 36 is adjustable, thereby adjusting the track gauge between the left track 37 and the right track 35. The bottom end of the electric push rod 20 is mounted below the left side of the track support base 33. The upper end of the electric push rod 20 extends upward and connects to the lower left side of the track support frame 36. The electric push rod 20 pushes the left side of the track support frame 36 upward, causing the track support frame 36 and its attached left and right tracks 37 and 35 to swing upward and left relative to the hinge base 34, achieving a simulated track superelevation state. The electric push rod 20 is a readily available device, and its structure will not be described in detail here.

[0033] like Figure 1 、 Figure 3 、 Figure 7 As shown, on the side away from the simulation track device 19 ( Figure 1 、 3 The inner surface of the side column 3 (on the right side in the figure) is connected to the vehicle width simulation device 16. Figure 1 、 3 The inner bottom end of the side column 3 (on the right side in the figure) is connected to a pillar side simulation device 18, and a pillar side limit adjustment device 17 capable of adjusting the position of the pillar side simulation device 18 is also connected between the pillar side simulation device 18 and the side column 3 to which it is connected. The pillar side simulation device 18 is connected to the bottom end of the side column 3 through a connecting plate. The bottom end of the pillar side simulation device 18 and the connecting plate are hingedly connected. The pillar side limit adjustment device 17 is connected between the outer surface of the pillar side simulation device 18 and the upper surface of the connecting plate. The pillar side limit adjustment device 17 includes a sliding rod 40, a positioning screw 38, and a positioning column 39. A sliding groove is provided in the middle of the sliding rod 40. The upper end of the sliding rod 40 is hinged to the back of the pillar side simulation device 18. The positioning column 39 is positioned on the upper surface of the connecting plate. The positioning screw 38 can pass through the sliding groove of the sliding rod 40 and be positioned in the positioning hole of the positioning column 39. Pulling the sliding rod 40 can adjust the position of the pillar side simulation device 18. After locking the positioning screw 38, the sliding rod 40 cannot move, and the position of the pillar side simulation device 18 is fixed.

[0034] The above embodiments are only preferred embodiments of the present invention. The structure of the present invention is not limited to the forms listed in the above embodiments. Any modifications, equivalent replacements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multifunctional limit simulation device, comprising a chassis (1), a support frame, a simulation track device (19), a tunnel height simulation device (10), and a vehicle side simulation device (6), wherein the simulation track device (19) is arranged on the inner side of the chassis (1), the support frame is connected to the chassis (1), and the tunnel height simulation device (10) and the vehicle side simulation device (6) are respectively connected to the support frame, characterized in that: The support frame is a gantry frame structure, the support frame includes two side columns (3) and a main crossbeam (5) connected to the top of the two side columns (3), the bottom ends of the two side columns (3) are respectively connected to the two sides of the base frame (1), the support frame also includes a sliding frame (9), the sliding frame (9) is connected to a sliding frame driving device, the sliding frame (9) includes a sliding frame crossbeam (23) and a sliding frame vertical rod (24) vertically connected to the lower side of both ends of the sliding frame crossbeam (23), the sliding frame (9) is arranged as a whole on the inner side of the two side columns (3) and the main crossbeam (5), the inner side surfaces of the two side columns (3) are respectively connected to the slide rails (26), and the outer side surfaces of the two slide frame vertical rods (24) are connected to sliders (25) that can cooperate with the slide rails (26). The sliding frame driving device is arranged outside a side column (3) and on the main crossbeam (5), and the sliding frame driving device can drive the sliding frame (9) as a whole to move up and down relative to the two side columns (3) and the main crossbeam (5). The tunnel height simulation device (10) is connected to the lower side of the sliding frame crossbeam (23), and the vehicle side simulation device (6) is obliquely connected between the sliding frame crossbeam (23) and the sliding frame vertical rod (24); the outer surfaces of the two side columns (3) are respectively installed with multiple groups of electrically controlled positioning devices (4) with corresponding positions, and the electrically controlled positioning devices (4) include a mounting bracket (31), a positioning pin (30), and a linear motor (32). The mounting bracket (31) is installed on the outer surface of the side column (3), and the mounting bracket (3 1) A through hole I is provided in the middle portion, and a through hole II penetrating the inner and outer surfaces and the slide rail groove of the side column (3) is provided at a position corresponding to the through hole I. The positioning pin (30) is positioned in the through hole I and the through hole II. The linear motor (32) is installed in the mounting bracket (31) and its output shaft is connected to the outer end of the positioning pin (30). When the linear motor (32) works, it can push the positioning pin (30) to slide inward to block the slider (25) connected to the vertical rod (24) of the sliding frame from sliding downward, thereby positioning the sliding frame (9); the simulated track device (19) includes a track support base (33), an articulated seat (34), a track support frame (36), an electric push rod (20), a left track (37) and a right track (35). The track support base (33 ) is arranged on the inner side of the base frame (1), the upper right end of the track support base (33) is connected to a pair of hinge seats (34), the right side of the track support frame (36) is hinged to the hinge seat (34) through a hinge device, the left track (37) and the right track (35) are connected to the track support frame (36) in parallel, the bottom end of the electric push rod (20) is installed below the left side of the track support base (33), the upper end of the electric push rod (20) extends upward and is connected to the lower left side of the track support frame (36), the electric push rod (20) can push the left side of the track support frame (36) upward, so that the track support frame (36) and the left track (37) and the right track (35) connected thereto are swung to the upper left relative to the hinge seat (34), thereby achieving a simulated track superelevation state.

2. The multifunctional limit simulation device according to claim 1, characterized in that: The sliding frame driving device includes a winch (15), a guide pulley (7) and a lifting pulley (13). The winch (15) is installed on the outside of one of the side columns (3). The winch (15) is a double-drum winch provided with two synchronous drums. The lifting pulleys (13) are connected to both ends of the sliding frame crossbeam (23). The bottom ends of the main crossbeam (5) on the upper side of the lifting pulley (13) are connected to fixed connection ears (12). Two sets of guide pulleys (7) are installed on the main crossbeam (5). The steel wire rope (8) of the winch (15) passes through the corresponding guide pulley (7) upwards and then passes through the corresponding lifting pulley (13) downwards, and then extends upwards to be fixedly connected to the corresponding fixed connection ears (12).

3. The multifunctional limit simulation device according to claim 1, characterized in that: The positioning pin (30) is a conical pin with a larger outer side and a smaller inner side, and the through hole II is a conical hole with a larger outer side and a smaller inner side.

4. The multifunctional limit simulation device according to claim 1, characterized in that: The invention also includes a contact network simulation device (11) and a tunnel side simulation device (14), wherein the upper end of the contact network simulation device (11) is connected to the middle position of the sliding frame crossbeam (23), the lower end of the contact network simulation device (11) is connected to the inner surface of one of the sliding frame vertical rods (24), and the tunnel side simulation device (14) is connected to the inner surface of one of the sliding frame vertical rods (24).

5. The multifunctional limit simulation device according to claim 1, characterized in that: A vehicle width simulation device (16) is connected to the inner surface of the side column (3) on the side away from the simulation track device (19).

6. The multifunctional limit simulation device according to claim 1, characterized in that: A pillar side simulation device (18) is connected to the inner bottom end of the side column (3) on the side away from the simulation track device (19), and a pillar side limit adjustment device (17) capable of adjusting the position of the pillar side simulation device (18) is also connected between the pillar side simulation device (18) and the side column (3) to which it is connected.

7. The multifunctional limit simulation device according to claim 1, characterized in that: The base frame (1) is a rectangular frame structure. The base frame (1) includes two wide bottom edges (28) and two long bottom edges (29) connected between the two wide bottom edges (28). The bottom ends of the two side columns (3) are respectively connected to the two wide bottom edges (28). A diagonal brace (22) and a reinforcing plate (2) are connected between the side columns (3) and the wide bottom edges (28). Stabilizing ropes (21) are also respectively connected between the two sides of the top of the side columns (3) and the two sides of the wide bottom edges (28).

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