Fast-assembly modularized MABR (Membrane Aerated Baffled Reactor) membrane assembly

Abstract

The invention discloses a fast-assembly modularized MABR membrane assembly, and relates to the field of MABR membranes, the fast-assembly modularized MABR membrane assembly comprises a reactor, a membrane assembly body and a perforated aeration pipe are mounted in an inner cavity of the reactor, a second support assembly is mounted at the top of the reactor, and a first support assembly is mounted at the bottom of the reactor; the top of the second supporting assembly is movably connected with a reinforcing assembly, the two sides of the top of the first supporting assembly are movably connected with vertical supporting columns and transverse supporting columns, and the two ends of the second supporting assembly and the two ends of the first supporting assembly are symmetrically provided with connecting piles. According to the fast-assembly modularized MABR membrane assembly, the installation process is simple and fast, the installation time can be effectively shortened, the modularized design supports single-group replacement, installation can be carried out without cutting off water and evacuating a pool body, the installation, operation and maintenance cost is reduced, the long-term use cost is low, meanwhile, the fast-assembly modularized MABR membrane assembly can adapt to membrane filaments of different specifications and the modification requirement of an existing pool body, and the application range is wide. And the use efficiency and the application range of the equipment are improved.

Description

Technical Field

[0001] The present invention relates to the field of MABR membranes, and in particular to a quick-install modular MABR membrane assembly. Background Art

[0002] MABR is a novel wastewater treatment technology that combines gas separation membrane technology with biofilm water treatment technology. Its principle is to use permeable hollow fiber membranes to supply oxygen to the microbial membranes attached to their surfaces. The microbial membranes then adsorb, absorb, and decompose organic matter, nitrogen, and phosphorus in the wastewater, thereby purifying the wastewater.

[0003] With the iterative upgrade of sewage treatment technology, membrane aerated biofilm reactor (MABR) has shown significant potential in sewage treatment due to its advantages such as bubble-free aeration, efficient denitrification and low energy consumption.

[0004] Traditional MABR membrane modules mainly adopt frame-type (requiring high-precision positioning) or baffle-type (relying on complex sealing structures). Although this has improved treatment efficiency to a certain extent, the following problems still exist in actual applications: High installation precision requirements: The traditional frame-type requires precise alignment or welding and riveting, which makes installation complicated; the baffle-type has strict requirements on appearance accuracy, resulting in a long construction period and demanding technical skills of operators; Low assembly efficiency: multiple steps of fastening or welding are required, and the construction period is long; Poor compatibility: The existing structure is difficult to adapt to membrane fibers of different sizes or pool environments, limiting its application in decentralized sewage or complex terrain.

[0005] Therefore, it is necessary to propose a quick-install modular MABR membrane assembly to solve the above problems. Summary of the Invention

[0006] The main purpose of the present invention is to provide a quick-install modular MABR membrane assembly, which can effectively solve the problems in the background technology.

[0007] To achieve the above object, the technical solution adopted by the present invention is: A quick-install modular MABR membrane assembly comprises a reactor, wherein a membrane assembly body and a perforated aeration tube are installed in the inner cavity of the reactor; A second support assembly is installed on the top of the reactor, a first support assembly is installed on the bottom of the reactor, a reinforcement assembly is movably connected to the top of the second support assembly, and vertical support columns and horizontal support columns are movably connected to both sides of the top of the first support assembly; Connecting piles are symmetrically installed at both ends of the second supporting assembly and the first supporting assembly. Connecting strips are installed at one end of the connecting piles close to the second supporting assembly and the first supporting assembly. Hoisting assemblies are symmetrically installed at both ends of the top of the second supporting assembly.

[0008] Preferably, water outlet pipes and air washing main pipes are symmetrically installed on both sides of the top of the reactor, the air washing main pipe is connected to the perforated aeration pipe, a water inlet pipe and a return pipe are installed at one end of the reactor, one end of the return pipe is communicated with the inner cavity of the reactor, and the other end of the return pipe is communicated with the inner cavity of the water outlet pipe, an air lift riser is installed on the side of the reactor, and an exhaust pipe is installed at the other end of the reactor.

[0009] Preferably, the membrane assembly body includes a biofilm and a breathable membrane, the inner layer of the reactor cavity close to the membrane assembly body is an aerobic zone, and the outer layer of the reactor cavity away from the membrane assembly body is an anoxic / anaerobic zone, which is used to achieve simultaneous nitrification and denitrification.

[0010] Preferably, the air lift riser is used to increase the pressure at the bottom of the reactor cavity, the air wash main pipe is used to input scrubbing gas, the air wash main pipe is connected to the inner cavity of the perforated aeration tube, and the perforated aeration tube is used to form bubbles on the surface of the membrane assembly body when scrubbing the membrane assembly body.

[0011] Preferably, positioning blocks are symmetrically and movably connected on both sides of the inner cavity of the second support component, and a screw rod is threadedly connected to the top of the inner cavity of the positioning block on one side, and the screw rod is rotatably connected to one side of the reinforcement component. A second rotating handle is installed on the top of the reinforcement component, and the second rotating handle is connected to the screw rod. A movable rod is installed on the top of the positioning block on the other side, and the top of the movable rod is installed on the other side of the bottom of the reinforcement component, and the bottom of the positioning block fits on both sides of the top of the reactor.

[0012] Preferably, a connecting rod is installed on the opposite side of the two positioning blocks, and the connecting rod is movably connected in the inner cavity of the second support component. Guide rods are symmetrically installed around the inner cavity of the second support component, and both ends of the positioning blocks are sleeved on the outer wall of the guide rod.

[0013] Preferably, a support plate is installed in the inner cavity of the first support assembly, the top of the support plate is attached to the bottom of the reactor, the vertical support columns and the horizontal support columns are connected to each other, and the vertical support columns and the horizontal support columns on both sides are attached to both sides of the reactor.

[0014] Preferably, a movable block is installed at the bottom of the transverse support column, and the movable block is movably connected in the inner cavity of the first support component. A bidirectional screw is rotatably connected in the inner cavity of the first support component and the middle support plate. A first turning handle is installed on the outer wall of the first support component, and the first turning handle is connected to the bidirectional screw, and the movable block is threadedly connected to the bidirectional screw.

[0015] Preferably, a reinforcement block is installed in the center of the bottom of the lifting assembly, and the reinforcement block is inserted into the inner cavity at the top of the second support assembly. The top and bottom connecting strips are both inserted into the inner cavities of the first support assembly and the second support assembly.

[0016] Preferably, the plug-in strip at the top is also inserted into the inner cavity of the reinforcement block, and the sides of the first support assembly and the second support assembly are both threadedly connected with positioning bolts, and the positioning bolts are connected to the plug-in strip and the reinforcement block.

[0017] Compared with the prior art, the present invention provides a quick-install modular MABR membrane assembly with the following beneficial effects: The quick-install modular MABR membrane component reduces assembly time by more than 50% compared with traditional methods. The installation process is simple and quick, which can effectively shorten installation time. The modular design supports single-group replacement and can be installed without stopping water or evacuating the pool body, reducing installation and operation and maintenance costs. The long-term use cost is low. At the same time, it can adapt to membrane fibers of different specifications and the needs of existing pool body modification, improving the utilization efficiency and application range of the equipment. The overall external dimensions are more compact, saving installation space, and effectively improving space utilization in places with limited space. The biological treatment efficiency of the membrane component itself is high, the required reactor volume is small, and there is no need to set up large solid-liquid separation equipment such as sedimentation tanks, so it occupies a small area. The quick-install modular MABR membrane component adopts bubble-free aeration technology in the membrane component body, which reduces the noise and volatile organic compound emissions generated during the aeration process and has little impact on the surrounding environment. At the same time, due to the good stability of the biofilm and the low residual sludge production, the difficulty and cost of sludge treatment are reduced, and the risk of secondary pollution is reduced. The membrane component body uses a breathable membrane to transfer oxygen to the biofilm, achieving bubble-free aeration with high oxygen transfer efficiency. Compared with traditional aeration methods, it can significantly reduce energy consumption and improve oxygen utilization. Generally, the oxygen utilization rate can be increased to more than 50%. When the membrane component body is being treated, microorganisms attach to the membrane surface to form a biofilm. The biofilm has a stable structure and a high microbial concentration and can withstand high organic loads and shock loads. At the same time, there are obvious anoxic and aerobic areas inside the biofilm, which is conducive to the simultaneous nitrification and denitrification reactions to achieve efficient nitrogen and phosphorus removal. The quick-install modular MABR membrane assembly can rotate the second rotating handle so that the positioning block on one side can be threadedly connected to the screw rod. At this time, the positioning block can be driven to fit on the top of the reactor through the connecting rod. When the reactor is installed, the top of the reactor can be better positioned. By rotating the first rotating handle, the bidirectional screw rod can be driven to rotate, so that the movable block can drive the vertical support column and the horizontal support column to move. Based on this, the two sides of the reactor can be positioned. When the reactor is working, the reactor can be modularly installed. The quick-install modular MABR membrane assembly facilitates the lifting of the reactor through the provided lifting assembly, thereby facilitating the transfer of the reactor. The lifting assembly can be installed through the provided plug-in strips and connecting piles, which can also reinforce the lifting assembly during lifting. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of the present invention as a whole; Figure 2 It is a structural schematic diagram of the reactor of the present invention; Figure 3 It is a schematic structural diagram of the reinforcement assembly of the present invention; Figure 4 It is a structural schematic diagram of the vertical support column of the present invention; Figure 5 It is a structural schematic diagram of the bottom of the present invention; Figure 6 It is a structural schematic diagram of the connecting pile of the present invention.

[0019] In the figure: 1. Reactor; 2. Water outlet pipe; 3. Air washing main pipe; 4. Exhaust pipe; 5. Membrane module body; 6. Perforated aeration pipe; 7. Return pipe; 8. First support assembly; 9. Second support assembly; 10. Support column; 11. Vertical support column; 12. Horizontal support column; 13. Movable block; 14. Bidirectional screw; 15. Lifting assembly; 16. Reinforcement block; 17. Connecting pile; 18. Connecting strip; 19. Water inlet pipe; 20. First turning handle; 21. Positioning bolt; 22. Reinforcement assembly; 23. Movable rod; 24. Second turning handle; 25. Positioning block; 26. Guide rod; 27. Connecting rod; 28. Support plate; 29. ​​Air lift riser; 30. Screw. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods. Example

[0021] like Figure 1 、 Figure 2As shown, a quick-install modular MABR membrane assembly includes a reactor 1, a membrane assembly body 5 and a perforated aeration tube 6 are installed in the inner cavity of the reactor 1, an outlet pipe 2 and an air washing main pipe 3 are symmetrically installed on both sides of the top of the reactor 1, and the air washing main pipe 3 is connected to the perforated aeration tube 6. An inlet pipe 19 and a return pipe 7 are installed at one end of the reactor 1, one end of the return pipe 7 is communicated with the inner cavity of the reactor 1, and the other end of the return pipe 7 is communicated with the inner cavity of the outlet pipe 2. An air lift standpipe 29 is installed on the side of the reactor 1, and the other end of the reactor 1 is installed. Equipped with an exhaust pipe 4, the membrane assembly body 5 includes a biofilm and a breathable membrane. The inner layer of the reactor 1 cavity near the membrane assembly body 5 is an aerobic zone, and the outer layer of the reactor 1 cavity away from the membrane assembly body 5 is an anoxic / anaerobic zone, which is used to achieve simultaneous nitrification and denitrification. The airlift riser 29 is used to increase the pressure at the bottom of the inner cavity of the reactor 1. The air wash main pipe 3 is used to input scrubbing gas. The air wash main pipe 3 is connected to the inner cavity of the perforated aeration pipe 6. The perforated aeration pipe 6 is used to form bubbles on the surface of the membrane assembly body 5 when scrubbing the membrane assembly body 5. The assembly time is reduced by more than 50% compared with the traditional method. The installation process is simple and fast, which can effectively shorten the installation time. The modular design supports single-group replacement and can be installed without stopping the water supply or evacuating the pool body, reducing installation and operation and maintenance costs. The long-term use cost is low. At the same time, it can adapt to membrane fibers of different specifications and the needs of existing pool body modification, which improves the utilization efficiency and application range of the equipment. The overall external dimensions are more compact, saving installation space, and can effectively improve space utilization in places with limited space. The biological treatment efficiency of the membrane component body 5 is high, and the required reactor 1 is small in size. There is no need to set up large solid-liquid separation equipment such as sedimentation tanks, and it occupies a small area.

[0022] The membrane component body 5 adopts bubble-free aeration technology, which reduces the noise and volatile organic compound emissions generated during the aeration process and has little impact on the surrounding environment. At the same time, due to the good stability of the biofilm and the low residual sludge production, the difficulty and cost of sludge treatment are reduced, and the risk of secondary pollution is reduced. The membrane component body 5 uses a breathable membrane to transfer oxygen to the biofilm, thereby achieving bubble-free aeration with high oxygen transfer efficiency. Compared with traditional aeration methods, it can significantly reduce energy consumption and improve oxygen utilization. Generally, the oxygen utilization rate can be increased to more than 50%. When the membrane component body 5 is processed, microorganisms attach to the membrane surface to form a biofilm. The biofilm has a stable structure and a high microbial concentration, and can withstand higher organic loads and shock loads. At the same time, there are obvious anoxic and aerobic areas inside the biofilm, which is conducive to the simultaneous nitrification and denitrification reactions, thereby achieving efficient nitrogen and phosphorus removal. Example

[0023] like Figure 1 、 Figure 3 、 Figure 4 、 Figure 5As shown, a quick-install modular MABR membrane assembly is provided. A second support assembly 9 is installed on the top of the reactor 1, a first support assembly 8 is installed on the bottom of the reactor 1, the top of the second support assembly 9 is movably connected to a reinforcement assembly 22, vertical support columns 11 and horizontal support columns 12 are movably connected on both sides of the top of the first support assembly 8, positioning blocks 25 are symmetrically movably connected on both sides of the inner cavity of the second support assembly 9, the top of the inner cavity of one side positioning block 25 is threadedly connected to a screw rod 30, the screw rod 30 is rotatably connected to one side of the reinforcement assembly 22, a second rotating handle 24 is installed on the top of the reinforcement assembly 22, the second rotating handle 24 is connected to the screw rod 30, a movable rod 23 is installed on the top of the other side positioning block 25, the top of the movable rod 23 is installed on the other side of the bottom of the reinforcement assembly 22, the bottom of the positioning block 25 is attached to both sides of the top of the reactor 1, and the two positioning blocks 25 are on opposite sides. A connecting rod 27 is installed, which is movably connected to the inner cavity of the second support assembly 9. Guide rods 26 are symmetrically installed around the inner cavity of the second support assembly 9. Both ends of the positioning block 25 are sleeved on the outer wall of the guide rod 26. A support plate 28 is installed in the inner cavity of the first support assembly 8. The top of the support plate 28 is attached to the bottom of the reactor 1. The vertical support column 11 and the transverse support column 12 are connected to each other. The vertical support columns 11 and the transverse support columns 12 on both sides are attached to both sides of the reactor 1. A movable block 13 is installed at the bottom of the transverse support column 12. The movable block 13 is movably connected to the inner cavity of the first support assembly 8. A bidirectional screw rod 14 is rotatably connected to the inner cavity of the first support assembly 8 and the intermediate support plate 28. A first rotating handle 20 is installed on the outer wall of the first support assembly 8. The first rotating handle 20 is connected to the bidirectional screw rod 14, and the movable block 13 is threadedly connected to the bidirectional screw rod 14; By rotating the second rotating handle 24, the positioning block 25 on one side can be threadedly connected to the screw rod 30. At this time, the positioning block 25 can be driven to fit on the top of the reactor 1 through the connecting rod 27. When the reactor 1 is installed, the top of the reactor 1 can be better positioned. By rotating the first rotating handle 20, the bidirectional screw rod 14 can be driven to rotate, so that the movable block 13 can drive the vertical support column 11 and the horizontal support column 12 to move. Based on this, the two sides of the reactor 1 can be positioned. When the reactor 1 is working, the reactor 1 can be modularly installed. Example

[0024] like Figure 1 、 Figure 6As shown, a quick-install modular MABR membrane assembly is shown, wherein connecting piles 17 are symmetrically installed at both ends of the second support assembly 9 and the first support assembly 8, and plug-in strips 18 are installed at one end of the connecting piles 17 close to the second support assembly 9 and the first support assembly 8. Hoisting assemblies 15 are symmetrically installed at both ends of the top of the second support assembly 9, and a reinforcement block 16 is installed in the middle of the bottom of the hoisting assembly 15. The reinforcement block 16 is inserted into the inner cavity of the top of the second support assembly 9, and the top and bottom plug-in strips 18 are both inserted into the inner cavities of the first support assembly 8 and the second support assembly 9. The top plug-in strip 18 is also inserted into the inner cavity of the reinforcement block 16. The sides of the first support assembly 8 and the second support assembly 9 are both threadedly connected with positioning bolts 21, which are connected to the plug-in strips 18 and the reinforcement block 16. The provided hoisting assembly 15 facilitates the hoisting of the reactor 1, thereby facilitating the transfer of the position of the reactor 1. The provided plug-in strips 18 and connecting piles 17 allow the hoisting assembly 15 to be installed, which can also reinforce the hoisting assembly 15 during hoisting.

[0025] The second support assembly 9 , the first support assembly 8 , the support column 10 , the vertical support column 11 , the horizontal support column 12 , the positioning block 25 , the connecting rod 27 , the support plate 28 and the connecting pile 17 are all made of SS304.

[0026] It should be noted that the present invention is a quick-install modular MABR membrane assembly. When in use, process gas enters the membrane assembly body 5 through the water inlet pipe 19, and oxygen and pollutants, such as COD and ammonia nitrogen, enter from both sides of the biofilm respectively: oxygen diffuses from the inner side of the membrane to the biofilm, while pollutants diffuse from the mixed liquid side to the surface of the biofilm. An oxygen concentration gradient is formed inside the biofilm. The inner layer close to the membrane is an aerobic zone dominated by nitrifying bacteria, and the outer layer is an anoxic / anaerobic zone dominated by denitrifying bacteria. Based on this, simultaneous nitrification and denitrification are achieved. This structure can complete denitrification in one reactor 1 without the need for internal reflux and additional carbon source addition. The exhaust gas after utilization by the biofilm is discharged from the membrane assembly body 5 through the exhaust pipe 4.

[0027] The gas for air stripping enters through the air lift riser 29, which increases the pressure at the bottom of the reactor 1. Under the action of the pressure difference, the sewage enters from the bottom of the membrane module body 5, passes vertically through the interior, and flows along the membrane surface. The water flow is in full contact with the biofilm attached to the membrane surface, and the pollutants are degraded by the microorganisms in the biofilm. The treated water flows out through the reflux pipe 7 into the air lift riser 29, and finally flows out from the outlet pipe 2 to form a reflux.

[0028] The scrubbing air enters the perforated aeration pipe 6 through the air scrubbing main pipe 3. When scrubbing, the air forms bubbles on the membrane surface. The rising and bursting of the bubbles generate strong shear force, which further loosens and removes pollutants on the membrane surface, keeps the micropores on the membrane surface unobstructed, reduces mass transfer resistance, and thus improves mass transfer efficiency, provides good conditions for the growth and metabolism of microorganisms, and strengthens the biological reaction process.

[0029] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A quick-install modular MABR membrane assembly, comprising a reactor (1), characterized in that: A membrane assembly body (5) and a perforated aeration tube (6) are installed in the inner cavity of the reactor (1); A second support assembly (9) is installed on the top of the reactor (1), a first support assembly (8) is installed on the bottom of the reactor (1), the top of the second support assembly (9) is movably connected to a reinforcement assembly (22), and both sides of the top of the first support assembly (8) are movably connected to vertical support columns (11) and horizontal support columns (12); Connecting piles (17) are symmetrically installed at both ends of the second supporting assembly (9) and the first supporting assembly (8), and plug-in strips (18) are installed at one end of the connecting pile (17) close to the second supporting assembly (9) and the first supporting assembly (8). Hoisting assemblies (15) are symmetrically installed at both ends of the top of the second supporting assembly (9).

2. A quick-install modular MABR membrane assembly according to claim 1, characterized in that: A water outlet pipe (2) and an air wash main pipe (3) are symmetrically installed on both sides of the top of the reactor (1). The air wash main pipe (3) is connected to the perforated aeration pipe (6). A water inlet pipe (19) and a return pipe (7) are installed at one end of the reactor (1). One end of the return pipe (7) is communicated with the inner cavity of the reactor (1), and the other end of the return pipe (7) is communicated with the inner cavity of the water outlet pipe (2). An air lift riser (29) is installed on the side of the reactor (1), and an exhaust pipe (4) is installed at the other end of the reactor (1).

3. A quick-install modular MABR membrane assembly according to claim 2, characterized in that: The membrane assembly body (5) includes a biofilm and a breathable membrane. The inner layer of the reactor (1) cavity close to the membrane assembly body (5) is an aerobic zone, and the outer layer of the reactor (1) cavity away from the membrane assembly body (5) is an anoxic / anaerobic zone, which is used to achieve simultaneous nitrification and denitrification.

4. A quick-install modular MABR membrane assembly according to claim 2, characterized in that: The air lift riser (29) is used to increase the pressure at the bottom of the inner cavity of the reactor (1), and the air wash main pipe (3) is used to input scrubbing gas. The air wash main pipe (3) is connected to the inner cavity of the perforated aeration pipe (6), and the perforated aeration pipe (6) is used to form bubbles on the surface of the membrane assembly body (5) when scrubbing the membrane assembly body (5).

5. A quick-install modular MABR membrane assembly according to claim 1, characterized in that: Positioning blocks (25) are symmetrically and movably connected on both sides of the inner cavity of the second support component (9), and a screw rod (30) is threadedly connected to the top of the inner cavity of the positioning block (25) on one side, and the screw rod (30) is rotatably connected to one side of the reinforcement component (22). A second rotating handle (24) is installed on the top of the reinforcement component (22), and the second rotating handle (24) is connected to the screw rod (30). A movable rod (23) is installed on the top of the positioning block (25) on the other side, and the top of the movable rod (23) is installed on the other side of the bottom of the reinforcement component (22). The bottom of the positioning block (25) is attached to both sides of the top of the reactor (1).

6. A quick-install modular MABR membrane assembly according to claim 5, characterized in that: A connecting rod (27) is installed on one side opposite to the two positioning blocks (25), and the connecting rod (27) is movably connected in the inner cavity of the second support assembly (9). Guide rods (26) are symmetrically installed around the inner cavity of the second support assembly (9), and both ends of the positioning blocks (25) are sleeved on the outer wall of the guide rod (26).

7. The quick-install modular MABR membrane assembly according to claim 1, characterized in that: A support plate (28) is installed in the inner cavity of the first support assembly (8), the top of the support plate (28) is attached to the bottom of the reactor (1), the vertical support column (11) and the horizontal support column (12) are connected to each other, and the vertical support column (11) and the horizontal support column (12) on both sides are attached to both sides of the reactor (1).

8. A quick-install modular MABR membrane assembly according to claim 7, characterized in that: A movable block (13) is installed at the bottom of the transverse support column (12), and the movable block (13) is movably connected in the inner cavity of the first support component (8). A bidirectional screw rod (14) is rotatably connected in the inner cavity of the first support component (8) and the middle support plate (28). A first rotating handle (20) is installed on the outer wall of the first support component (8), and the first rotating handle (20) is connected to the bidirectional screw rod (14). The movable block (13) is threadedly connected to the bidirectional screw rod (14).

9. The quick-install modular MABR membrane assembly according to claim 1, characterized in that: A reinforcement block (16) is installed in the center of the bottom of the hoisting assembly (15), and the reinforcement block (16) is plugged into the inner cavity of the top of the second support assembly (9). The top and bottom plug-in strips (18) are both plugged into the inner cavities of the first support assembly (8) and the second support assembly (9).

10. The quick-install modular MABR membrane assembly according to claim 1, characterized in that: The plug-in strip (18) at the top is also plugged into the inner cavity of the reinforcement block (16), and the sides of the first support assembly (8) and the second support assembly (9) are both threadedly connected with positioning bolts (21), and the positioning bolts (21) are connected to the plug-in strip (18) and the reinforcement block (16).

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