A vacuum explosion welding production workshop

Abstract

The present invention relates to the field of vacuum explosion welding technology, and specifically to a vacuum explosion welding production workshop, comprising a workshop body, an explosion welding bed system, a linear transport system, and a pre-installation system. The workshop body comprises a circular arched steel column, a sealed shell, a reinforcing rib plate, an energy-absorbing material, and a protective, explosion-proof, and energy-consuming structure. A cavity is formed between the sealed shell and the circular arched steel column. Door bodies are provided at both ends of the sealed shell along the transport direction of the linear transport system. The reinforcing rib plate is provided in the cavity, the energy-absorbing material is filled in the cavity, and the protective, explosion-proof, and energy-consuming structure is provided inside the circular arched steel column. The present invention ensures that all types of impacts caused by the explosion are controlled within the range allowed by personnel safety and building safety, ensures good product quality, and reduces the use of explosives, thereby improving overall production efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of vacuum explosion welding, in particular to a vacuum explosion welding production workshop. Background Art

[0002] Explosive welding technology uses explosives as an energy source to achieve metallurgical bonding of dissimilar metal sheets, tubes, columns, and other components. It offers two key advantages: first, it prevents excessive reactions between dissimilar metals, enabling the welding of dissimilar metals that cannot be achieved with conventional fusion welding; second, it is suitable for large-scale composite operations, facilitating the manufacture of various cladding materials. Due to their unique advantages and characteristics, explosive welding products have found widespread application in numerous fields, including defense, aviation, aerospace, petroleum, chemical engineering, and machinery manufacturing. However, the harmful effects of explosive welding have led to its widespread use in remote mountainous areas, abandoned mine sites, and other outdoor locations, far from urban and rural residents.

[0003] Chinese patent CN201210365589.6 discloses a wave-blocking device for explosive welding air shock waves, which shows certain advantages over open-air explosive welding sites, but is not inherently safe for shock waves and noise. Chinese patent CN202121080055.X discloses a large vacuum container tank for explosive welding, and CN201621118154.1 discloses a vacuum metal composite material explosive welding device, which eliminates the impact of explosive shock waves and noise on the surrounding environment. However, due to the cyclic operation adopted in the tank, the welding time is short and the intensity is high, which can easily reduce the fatigue strength of the tank, posing a safety hazard to explosive welding. At the same time, there are also aspects that need to be optimized for the vibration generated by explosive welding. Summary of the Invention

[0004] In response to the above problems, a vacuum explosion welding production workshop is provided, which plays a first-level protection role through protective, explosion-proof and energy-absorbing structures, and realizes a second-level protection role through the combination of arched steel columns, sealed shells, reinforcing ribs and energy-absorbing materials. The time spent on the cycle is reduced by completing the pre-installation and positioning of the base plate and composite plate externally.

[0005] In order to solve the problems of the existing technology, a vacuum explosion welding production workshop is provided, which includes a workshop body, an explosion welding bed system, a linear transportation system and a pre-installation system. The workshop body includes a circular arch steel column, a sealed shell, a reinforcing rib plate, an energy-absorbing material and a protective, explosion-proof and energy-consuming structure. The circular arch steel column is fixedly arranged in the middle section of the linear transportation system, the explosion welding bed system is fixedly arranged between the circular arch steel column and the linear transportation system, the sealed shell is fixedly arranged at the connection of the circular arch steel column, the sealed shell wraps the circular arch steel column, and a cavity is formed between the sealed shell and the circular arch steel column. The sealed shell is arranged at both ends along the transportation direction of the linear transportation system. A door body is provided, and a reinforcing rib plate is provided in the cavity. The reinforcing rib plate is fixedly connected to the arched steel column and the sealed shell respectively. The energy-absorbing material is filled in the cavity. The protective, explosion-proof and energy-consuming structures are provided inside the arched steel column. The pre-installation system is fixedly provided at the end of the linear transportation system. The composite plate, support and base plate are position-matched from top to bottom in the pre-installation system. The linear transportation system transports the composite plate, support and base plate that have completed position matching from the pre-installation system to the explosion bed system. The linear transportation system transports the composite plate and base plate that have completed explosion welding out of the explosion welding bed system. The support will be squeezed under the impact of the explosion, thereby welding the composite plate and base plate.

[0006] Preferably, the protective, explosion-proof and energy-absorbing structure includes a protective steel plate, a shock-absorbing spring and a damper. The protective steel plate is slidably arranged inside the circular arched steel column. The sliding direction of the protective steel plate is perpendicular to the moving direction of the pre-installed system. The overall shape of the protective steel plate is parallel to the inner surface of the circular arched steel column. The shock-absorbing spring is arranged between the protective steel plate and the circular arched steel column, and the damper and the shock-absorbing spring are fixedly connected.

[0007] Preferably, the protective steel plate at the top end of the arched steel cylinder is arranged in an arc shape, and the number of arc-shaped protective steel plates evenly arranged around the same axis is at least three, and the arc-shaped protective steel plates evenly arranged around the same axis are all slidably fitted with each other.

[0008] Preferably, the protective, explosion-proof and energy-absorbing structure also includes a keel, which is composed of criss-crossed steel strips. The spacing between the steel strips is adapted to the area of ​​the protective steel plate. The shape of the keel is adapted to and fits the inner surface of the steel column, and one end of the shock-absorbing spring is fixedly connected to the keel.

[0009] Preferably, a vacuum pumping system is further included, a first air hole is opened on the arched steel cylinder, a second air hole is opened on the sealed shell, and the vacuum pumping system is connected to the interior of the arched steel cylinder through the second air hole.

[0010] Preferably, the explosive welding bed system includes an explosive bed foundation and a movable steel plate. There are two movable steel plates. The explosive bed foundation is the floor of the main workshop body. The two movable steel plates are mirror-distributed with the transport direction of the linear transport system as the center line. The sliding direction of the movable steel plate is perpendicular to the transport direction of the linear transport system. The explosive bed foundation is located at the center of the center line connecting the two movable steel plates.

[0011] Preferably, the explosive welding bed system also includes a hydraulic reset system, the output end of the hydraulic reset system is fixedly connected to the movable steel plate. When the base plate and the composite plate enter the explosive bed foundation, the hydraulic reset system makes the two movable steel plates close to the base plate and the composite plate. When explosive welding is performed, the explosion pushes the two movable steel plates away from the base plate and the composite plate.

[0012] Preferably, the linear transport system includes a track and a crane, the track passes through the workshop body, and the crane is slidably set on the track. The crane can transport the composite plates, supports and base plates in the pre-installed system from the pre-installed system to the explosive bed foundation.

[0013] Preferably, the linear transport system further comprises a switch, the position of the track below the door body is arranged as a switch that can be closed, and the door body is a double-layer hydraulic explosion-proof door.

[0014] Preferably, the pre-installation system includes a fixing frame and a support member. There are two fixing frames, and the two fixing frames are mirror-distributed with the transport direction of the linear transport system as the center line. The support member is fixed on the fixing frame, and each fixing frame is provided with support members of two heights. The base plate and the composite plate are placed on the support members of the same height.

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

[0016] The present invention realizes the first layer of protection function through the protective, explosion-proof and energy-absorbing structure, realizes the second layer of protection function through the coordination of the arched steel column, the sealed shell, the reinforcing rib plate and the energy-absorbing material, and realizes the function of reducing the time spent on the cycle by completing the positioning work of the base plate and the double plate externally, thereby ensuring that all kinds of impacts caused by the explosion are controlled within the range allowed by the safety of personnel and buildings, ensuring better product quality while reducing the use of explosives and improving overall production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional schematic diagram of a vacuum explosion welding production workshop before welding.

[0018] Figure 2 The present invention is a three-dimensional cross-sectional schematic diagram of a vacuum explosion welding production workshop before welding.

[0019] Figure 3It is a three-dimensional schematic diagram of welding in a vacuum explosion welding production workshop.

[0020] Figure 4 The invention is a cross-sectional schematic diagram of welding in a vacuum explosion welding production workshop.

[0021] Figure 5 It is a cross-sectional schematic diagram of a vacuum explosion welding production workshop after welding.

[0022] Figure 6 yes Figure 3 A partial enlarged schematic diagram of the middle A.

[0023] The numbers in the figure are:

[0024] 1- Workshop body; 11- Arched steel column; 111- First air hole; 12- Sealed shell; 121- Door body; 122- Second air hole; 13- Reinforcement rib plate; 14- Energy-absorbing material; 15- Protective, explosion-proof and energy-consuming structure; 151- Protective steel plate; 152- Shock-absorbing spring; 153- Damper; 154- Keel; 2- Explosive welding bed system; 21- Moving steel plate; 22- Hydraulic reset system; 3- Linear transport system; 31- Track; 32- Turnout; 4- Pre-installation system; 41- Fixed frame; 42- Support; 5- Detonator and explosives; 6- Double plate; 7- Support; 8- Base plate. DETAILED DESCRIPTION

[0025] In order to further understand the features, technical means, specific objectives and functions achieved by the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] See also Figure 1-Figure 3As shown, a vacuum explosion welding production workshop includes a workshop body 1, an explosion welding bed system 2, a linear transportation system 3 and a pre-installation system 4. The workshop body 1 includes a circular arch steel column, a sealed shell 12, a reinforcing rib plate 13, an energy-absorbing material 14 and a protective, explosion-proof and energy-consuming structure 15. The circular arch steel column is fixedly arranged in the middle section of the linear transportation system 3, the explosion welding bed system 2 is fixedly arranged between the circular arch steel column and the linear transportation system 3, the sealed shell 12 is fixedly arranged in connection with the circular arch steel column, the sealed shell 12 wraps the circular arch steel column, and a cavity is formed between the sealed shell 12 and the circular arch steel column. The sealed shell 12 is provided with door bodies 121 at both ends along the transportation direction of the linear transportation system 3. , the reinforcing rib plate 13 is arranged in the cavity, and the reinforcing rib plate 13 is fixedly connected to the arched steel column and the sealed shell 12 respectively, the energy-absorbing material 14 is filled in the cavity, and the protective, explosion-proof and energy-consuming structure 15 is arranged inside the arched steel column. The pre-installation system 4 is fixedly arranged at the end of the linear transportation system 3, and the composite plate 6, support 7 and base plate 8 are positioned in the pre-installation system 4 from top to bottom. The linear transportation system 3 transports the composite plate 6, support 7 and base plate 8 that have completed position matching from the pre-installation system 4 to the explosion bed system. The linear transportation system 3 transports the composite plate 6 and base plate 8 that have completed explosion welding out of the explosion welding bed system 2. The support 7 will be squeezed under the impact of the explosion, thereby welding the composite plate 6 and base plate 8.

[0027] The substrate 8 is placed on the pre-installation system 4, and then the support 7 is placed on the substrate 8, and then the composite plate 6 is placed on the support 7. Then the linear transport system 3 is controlled to move the pre-installation system 4 to the interior of the workshop body 1 and place it on the explosion bed system 2. The pre-installation system 4 leaves, and then the protective layer, explosives and detonators 5 are placed on the composite plate. The door body 121 is closed to seal the workshop body 1 and evacuate to the set vacuum degree. Then the detonator and explosives 5 are detonated. The energy generated by the explosion of the explosive drives the composite plate 6 to collide with the substrate 8 at high speed, and the metal material at the collision interface undergoes plastic deformation and Melting, so that the two metals are tightly combined together. Compared with the existing technology, the protective, explosion-proof and energy-absorbing structure 15 of the present invention plays the role of the first layer of protection. The second layer of protection is achieved by the cooperation of the arched steel column, the sealed shell 12, the reinforcing rib plate 13 and the energy-absorbing material 14. The positioning work of the base plate 8 and the composite plate 6 is completed externally to reduce the time spent on the cycle, thereby ensuring that all kinds of impacts caused by the explosion are controlled within the range allowed by the safety of personnel and buildings. While ensuring better product quality, it also reduces the use of explosives and improves the overall production efficiency.

[0028] See also Figure 4-Figure 5As shown: the protective, explosion-proof and energy-absorbing structure 15 includes a protective steel plate 151, a shock-absorbing spring 152 and a damper 153. The protective steel plate 151 is slidably arranged inside the arched steel column. The sliding direction of the protective steel plate 151 is perpendicular to the moving direction of the pre-installation system 4. The overall shape of the protective steel plate 151 is parallel to the inner surface of the arched steel column. The shock-absorbing spring 152 is arranged between the protective steel plate 151 and the arched steel column. The damper 153 and the shock-absorbing spring 152 are fixedly connected.

[0029] Part of the impact energy generated by the explosion of the explosives will push the protective steel plate 151 to move away from the explosive welding bed assembly, and part of the shock wave energy generated by the explosion will be converted into compression energy through the shock-absorbing spring 152, and then the compression energy of the spring will be consumed as quickly as possible through the damper 153. Compared with the existing technology, the protective steel plate 151, shock-absorbing spring 152 and damper 153 of the present invention cooperate to complete the working cycle of protection, explosion resistance and energy consumption, thereby performing the first layer of processing on the impact of the explosion.

[0030] See also Figure 4-Figure 5 As shown: the protective steel plate 151 at the top end of the arched steel cylinder is set to be arc-shaped, and the number of arc-shaped protective steel plates 151 evenly arranged around the same axis is at least three, and the arc-shaped protective steel plates 151 evenly arranged around the same axis are all slidingly fitted.

[0031] The shock wave generated by the explosion pushes the arc-shaped protective steel plate 151 on the top to move in a straight line, and gaps appear between adjacent arc-shaped protective steel plates 151. Part of the impact energy passes through the gaps and is discharged into the main body and the cavity to be absorbed by the energy-absorbing material 14 filled therein. Compared with the prior art, the present invention provides multiple arc-shaped protective steel plates 151 on the top, thereby reducing the shock wave borne by the arc-shaped protective steel plate 151 and prolonging the time for the arc-shaped protective steel plate 151 to deform.

[0032] See also Figure 4-Figure 5 As shown: the protective, explosion-proof and energy-absorbing structure 15 also includes a keel 154, which is composed of crisscrossed steel strips. The spacing between the steel strips is adapted to the area of ​​the protective steel plate 151, and the shape of the keel 154 is adapted to and fits the inner surface of the steel column. One end of the shock-absorbing spring 152 is fixedly connected to the keel 154.

[0033] When the protective steel plate 151 slides, there will be an explosive impact through the gap and contact with the keel 154. The keel 154, the protective steel plate 151, the shock-absorbing spring 152, and the damper 153 can be replaced when they are damaged. Compared with the existing technology, the keel 154 of the present invention contacts the inner surface of the arched steel column to play a protective role, thereby reducing maintenance costs.

[0034] See also Figure 4-Figure 5As shown: it also includes a vacuum system, a first air hole 111 is opened on the arched steel cylinder, a second air hole 122 is opened on the sealed shell 12, and the vacuum system is connected to the interior of the arched steel cylinder through the second air hole 122.

[0035] After closing the door 121, the vacuum system is started, and the air inside the workshop body 1 flows out to the outside through the first air hole 111 and the second air hole 122. Compared with the existing technology, the vacuum system of the present invention controls the vacuum degree inside the workshop body 1 after it is sealed, thereby adjusting the explosion effect of the explosives.

[0036] See also Figure 2 and Figure 4-Figure 5 As shown: the explosive welding bed system 2 includes an explosive bed foundation and a movable steel plate 21. There are two movable steel plates 21. The explosive bed foundation is the ground of the workshop body 1. The two movable steel plates 21 are mirror-distributed with the transportation direction of the linear transportation system 3 as the center line. The sliding direction of the movable steel plate 21 is perpendicular to the transportation direction of the linear transportation system 3. The explosive bed foundation is located at the center of the center line connecting the two movable steel plates 21.

[0037] When the placed substrate 8, support 7 and composite plate 6 are transported to the explosive welding bed foundation, the two movable steel plates 21 are controlled to approach each other so that the substrate 8, support 7 and composite plate 6 are located at the center of the workshop body 1. Compared with the prior art, the movable steel plate 21 of the present invention has an explosion protection function and fixes the position of the substrate 8 and composite plate 6 on the explosive welding bed system 2.

[0038] See also Figure 2 and Figure 4-Figure 5 As shown: the explosive welding bed system 2 also includes a hydraulic reset system 22, the output end of the hydraulic reset system 22 is fixedly connected to the movable steel plate 21. When the base plate 8 and the doubler plate 6 enter the explosive bed foundation, the hydraulic reset system 22 makes the two movable steel plates 21 close to the base plate 8 and the doubler plate 6. When explosive welding is performed, the explosion pushes the two movable steel plates 21 away from the base plate 8 and the doubler plate 6.

[0039] The impact generated by the explosion can push the protective steel plate 151 connected to the hydraulic reset system 22 away from the explosion point. Compared with the prior art, the hydraulic reset system 22 of the present invention enables the protective steel plate 151 to move with the explosion impact, thereby improving the service life of the protective steel plate 151.

[0040] See also Figure 1-Figure 3 As shown: the linear transport system 3 includes a track 31 and a crane. The track 31 passes through the workshop body 1. The crane is slidably set on the track 31. The crane can transport the composite plate 6, support 7 and base plate 8 in the pre-installation system 4 from the pre-installation system 4 to the explosive bed foundation.

[0041] The overhead crane slides on the track 31 to transport the doubler plate 6, support 7 and base plate 8 that have been position-matched in the pre-installation system 4 to the explosive bed system. Compared with the prior art, the track 31 and overhead crane of the present invention limit the moving trajectory of the doubler plate 6 and base plate 8, thereby ensuring that the doubler plate 6 and base plate 8 that have been position-matched in the pre-installation system 4 can be moved to the center of the explosive bed system.

[0042] See also Figure 3 As shown, the linear transport system 3 further includes a switch 32 , and the position of the track 31 below the door body 121 is set as a switch 32 that can be closed, and the door body 121 is a double-layer hydraulic explosion-proof door.

[0043] When the overhead crane needs to enter the interior of the workshop body 1, the switch 32 is controlled to move to make the track 31 intact. When the workshop body 1 needs to be sealed, the switch 32 is controlled to move to disconnect the track 31, and then the door body 121 is controlled to close. Compared with the prior art, the switch 32 of the present invention enables the track 31 to be connected or disconnected, thereby ensuring a better sealing effect of the workshop body 1.

[0044] See also Figure 1 、 Figure 3 and Figure 6 As shown: the pre-installation system 4 includes a fixing frame 41 and a support member 42. There are two fixing frames 41. The two fixing frames 41 are distributed in a mirror image with the transport direction of the linear transport system 3 as the center line. The support member 42 is fixedly set on the fixing frame 41. Each fixing frame 41 is provided with support members 42 of two heights. The base plate 8 and the composite plate 6 are placed on the support members 42 at the same height.

[0045] The base plate 8 and the composite plate 6 are placed in sequence on the support 42 at the same height, and then the protective layer, detonator and explosive 5 are placed respectively. Compared with the prior art, the pre-installation system 4 of the present invention enables the position matching of the composite plate 6 and the base plate 8 to be carried out outside the workshop body 1, thereby reducing the time required for the work cycle.

[0046] The above embodiments merely represent one or several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A vacuum explosion welding production workshop, comprising a workshop body (1), an explosion welding bed system (2), a linear transport system (3) and a pre-installation system (4), characterized in that: The workshop body (1) includes a circular arched steel column, a sealed shell (12), a reinforcing rib plate (13), an energy-absorbing material (14), and a protective, explosion-proof, and energy-dissipating structure (15); The circular arched steel column is fixedly arranged in the middle section of the linear transport system (3), and the explosive welding bed system (2) is fixedly arranged between the circular arched steel column and the linear transport system (3); The sealed housing (12) is fixedly arranged on the arched steel column, the sealed housing (12) wraps the arched steel column, a cavity is formed between the sealed housing (12) and the arched steel column, and door bodies (121) are provided at both ends of the sealed housing (12) along the transport direction of the linear transport system (3); The reinforcing rib plate (13) is arranged in the cavity, and the reinforcing rib plate (13) is fixedly connected to the arched steel column and the sealing shell (12) respectively; Energy absorbing material (14) is filled in the cavity; The protective, explosion-proof and energy-dissipating structure (15) is arranged inside the arched steel column; The pre-installation system (4) is fixedly arranged at the end of the linear transport system (3), and the doubler plate (6), the support (7) and the base plate (8) are sequentially matched in the pre-installation system (4) from top to bottom. The linear transport system (3) transports the doubler plate (6), the support (7) and the base plate (8) that have been matched in position from the pre-installation system (4) to the explosion bed system. The linear transport system (3) transports the doubler plate (6) and the base plate (8) that have been explosively welded out of the explosion welding bed system (2). The support (7) is squeezed under the impact of the explosion, thereby welding the doubler plate (6) and the base plate (8). The protective, explosion-proof and energy-dissipating structure (15) includes a protective steel plate (151), a shock-absorbing spring (152) and a damper (153); The protective steel plate (151) is slidably arranged inside the circular arch steel column, the sliding direction of the protective steel plate (151) is perpendicular to the moving direction of the linear transport system (3), the overall shape of the protective steel plate (151) is parallel to the inner surface of the circular arch steel column, the shock-absorbing spring (152) is arranged between the protective steel plate (151) and the circular arch steel column, and the damper (153) and the shock-absorbing spring (152) are fixedly connected; the protective steel plate (151) at the top end of the circular arch steel column is arranged in an arc shape, the number of the arc-shaped protective steel plates (151) uniformly arranged around the same axis is at least three, and the arc-shaped protective steel plates (151) uniformly arranged around the same axis are all slidably matched with each other; The explosive welding bed system (2) includes an explosive bed foundation and a movable steel plate (21); the number of the movable steel plates (21) is two, the explosive bed foundation is the ground of the workshop body (1), the two movable steel plates (21) are mirror-imaged with the transport direction of the linear transport system (3) as the center line, the sliding direction of the movable steel plate (21) is perpendicular to the transport direction of the linear transport system (3), and the explosive bed foundation is located at the center of the center line connecting the two movable steel plates (21).

2. A vacuum explosion welding production workshop according to claim 1, characterized in that: The protective, explosion-resistant and energy-dissipating structure (15) also includes a keel (154); The keel (154) is composed of crisscrossed steel strips, the spacing between the steel strips is adapted to the area of ​​the protective steel plate (151), the shape of the keel (154) is adapted to and fits the inner surface of the steel column, and one end of the shock-absorbing spring (152) is fixedly connected to the keel (154).

3. A vacuum explosion welding production workshop according to claim 2, characterized in that: The invention also includes a vacuum pumping system. A first air hole (111) is provided on the arched steel column, and a second air hole (122) is provided on the sealed shell (12). The vacuum pumping system is connected to the interior of the arched steel column through the second air hole (122).

4. A vacuum explosion welding production workshop according to claim 1, characterized in that: The explosive welding bed system (2) further includes a hydraulic reset system (22); The output end of the hydraulic reset system (22) is fixedly connected to the movable steel plate (21). When the base plate (8) and the doubler plate (6) enter the explosive bed foundation, the hydraulic reset system (22) causes the two movable steel plates (21) to approach the base plate (8) and the doubler plate (6). When explosive welding is performed, the explosion pushes the two movable steel plates (21) away from the base plate (8) and the doubler plate (6).

5. A vacuum explosion welding production workshop according to claim 4, characterized in that: The linear transport system (3) includes a track (31) and a crane; The track (31) passes through the workshop body (1), and the overhead crane is slidably arranged on the track (31). The overhead crane can transport the double plate (6), support (7) and base plate (8) in the pre-installed system (4) from the pre-installed system (4) to the explosive bed foundation.

6. A vacuum explosion welding production workshop according to claim 5, characterized in that: The linear transport system (3) further includes a switch (32); The position of the track (31) below the door body (121) is set as a switch (32) that can be closed, and the door body (121) is a double-layer hydraulic explosion-proof door.

7. A vacuum explosion welding production workshop according to claim 6, characterized in that: The pre-installation system (4) includes a fixing frame (41) and a support member (42); There are two fixing frames (41), and the two fixing frames (41) are distributed in a mirror image with the transport direction of the linear transport system (3) as the center line. The support members (42) are fixedly arranged on the fixing frames (41), and each fixing frame (41) is provided with support members (42) of two heights. The base plate (8), the support (7) and the doubler plate (6) are placed on the support members (42) of the same height.

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