Sewage treatment device with multi-stage filtering and cleaning function

Abstract

The invention belongs to the technical field of sewage treatment, and particularly relates to a sewage treatment device with a multi-stage filtering and cleaning function, the sewage treatment device comprises a shell, a motor and a filter plate, the top of the shell is fixedly connected with a support frame, the motor is fixedly connected to the top of the support frame, a motor output shaft penetrates through the support frame, and the bottom of the motor output shaft is fixedly connected with a stirring rod; the bottom of the stirring rod extends into the shell, a sieve plate is fixedly connected to the inner wall of the shell, a dosing tank is fixedly connected to the top of the shell and communicates with the shell, a reciprocating assembly is arranged at the top of the shell, and the filter plate is movably connected to the inner wall of the shell; the stirring rod rotates and drives the scraping plate to rotate to clean the sieve plate, the effect of preventing the sieve plate from being blocked and driving the baffle to move in a reciprocating mode so that chemicals and sewage can be fully mixed is achieved, the rotary knob drives the clamping block to move to fix or unlock the sieve plate, the effect of dismounting, mounting and replacing the sieve plate is achieved, operation is easy and convenient, and practicability is high.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to a sewage treatment device with multi-stage filtering and cleaning functions. Background Art

[0002] Sewage treatment: the process of purifying sewage to meet the water quality requirements for discharge into a certain water body or reuse. Sewage treatment is widely used in various fields such as construction, agriculture, transportation, energy, petrochemicals, environmental protection, urban landscape, medical care, catering, etc., and is increasingly entering the daily life of ordinary people. Deep sewage treatment is also called advanced treatment or tertiary treatment. It is to further treat the secondary treated water physically, chemically and biologically in order to effectively remove impurities of various properties in the sewage, so as to meet the user's requirements for water quality. Common methods for deep sewage treatment are as follows: activated carbon adsorption and ion exchange sewage treatment technology, membrane separation, advanced oxidation and wet oxidation, etc. Sewage treatment equipment is an industrial equipment that can effectively treat urban domestic sewage, industrial wastewater, etc., to prevent sewage and pollutants from directly flowing into the water, which is of great significance to improving the ecological environment, improving the quality of the city and promoting economic development. When treating sewage, it is necessary to use a sewage treatment device with multi-stage filtration and cleaning functions.

[0003] The sewage treatment device with multi-stage filtering and cleaning function in the prior art, when actually used, has a large amount of impurities such as particulate matter in the sewage, which can easily clog the sieve plate during filtration, affecting the filtering effect of the sewage. In addition, a filter plate is required for sewage filtration, and the filter plate is usually installed inside the sewage treatment device, which makes it inconvenient to replace the filter plate and inconvenient to use. Therefore, we propose a sewage treatment device with multi-stage filtering and cleaning function to solve the above-mentioned problems. Summary of the invention

[0004] Based on the background technology, in actual use, since sewage contains a large amount of impurities such as particulate matter, these impurities are easy to clog the sieve plate during filtration, which affects the filtering effect of the sewage. In addition, a filter plate is required for sewage filtration, and the filter plate is usually installed inside the sewage treatment device, which makes it inconvenient to replace the filter plate and causes a technical problem of being inconvenient to use. The present invention proposes a sewage treatment device with multi-stage filtration and cleaning functions.

[0005] The present invention proposes a sewage treatment device with multi-stage filtering and cleaning functions, comprising a shell, a motor and a filter plate, the top of the shell is fixedly connected to a support frame, the motor is fixedly connected to the top of the support frame, the motor output shaft passes through the support frame, the bottom of the motor output shaft is fixedly connected to a stirring rod, the bottom of the stirring rod extends to the inside of the shell, the inner wall of the shell is fixedly connected to a sieve plate, the top of the shell is fixedly connected to a drug dosing tank, and the drug dosing tank is communicated with the shell, a reciprocating component is provided on the top of the shell, the filter plate is movably connected to the inner wall of the shell, and the front side of the filter plate extends to the outside of the shell, the front side of the shell is fixedly connected to a fixed box, and the inner wall of the fixed box is provided with a fixed component.

[0006] By means of the above mechanism: the motor drives the stirring rod to rotate and stir the sewage, the filter plate is used to filter and intercept the particles in the sewage, the medicine is used to put the medicine into the medicine tank to purify the sewage, the repeated components are used to control the medicine in the medicine tank to intermittently enter the shell so that the medicine and water are fully mixed, and the fixing components are used to fix or unlock the filter plate so that the filter plate can be disassembled and replaced;

[0007] Preferably, the reciprocating assembly includes a shifting rod, a contact plate, two fixed rods and a baffle;

[0008] The lever is fixedly connected to the outer wall of the stirring rod, the contact plate is slidably connected to the top of the shell, the left side of the lever is rotatably connected to a rotating wheel, the outer wall of the rotating wheel is in active contact with the left side of the contact plate, the two fixed rods are respectively fixedly connected to the front and rear sides of the contact plate, the baffle is slidably connected to the top of the shell, and the left side of the baffle is fixedly connected to the right sides of the two fixed rods, the outer wall of the medicine tank is fixedly connected to a sealing frame, and the left side of the baffle extends to the inside of the sealing frame.

[0009] Furthermore, the rotation of the lever will contact the contact plate and push the contact plate to the right. When the contact plate moves, it will drive the fixed rod to move horizontally. The rightward movement of the fixed rod will drive the baffle to move right. At this time, the movement of the baffle makes the medicine dosing tank lose its restriction, so that the medicine in the medicine dosing tank enters the shell.

[0010] Preferably, the fixing assembly includes a knob, a transmission rod, a connecting rod, an auxiliary rod, two cross bars, two cross plates and two clamping blocks;

[0011] The transmission rod is rotatably connected to the inner wall of the fixed box, the knob is fixedly connected to the front side of the transmission rod, and the front side of the knob extends to the outside of the fixed box, the connecting rod and the auxiliary rod are both rotatably connected to the rear side of the transmission rod, the two cross plates are symmetrically slidably connected to the inner wall of the fixed box, and the bottoms of the two cross plates extend to the outside of the fixed box, the two cross bars are respectively fixedly connected to the sides of the two cross plates close to each other, the front sides of the two cross bars are respectively rotatably connected to the rear sides of the connecting rod and the auxiliary rod, the two clamping blocks are respectively fixedly connected to the sides of the two cross plates close to each other, the left and right sides of the filter plate are provided with clamping slots, and the number of the clamping slots is two, and the two clamping blocks are adapted to the corresponding clamping slots.

[0012] Furthermore, rotating the knob will drive the transmission rod to rotate, and when the transmission rod rotates, it will push the connecting rod and the auxiliary rod. At this time, the connecting rod and the auxiliary rod push the two cross bars to move away from each other. When the cross bar moves, it will push the cross plate. At this time, the two cross plates move away from each other and pull the two card blocks to move away from each other and lose contact with the card slots, thereby unlocking the filter plate.

[0013] Preferably, a scraper is fixedly connected to the bottom of the stirring rod, and the bottom of the scraper is in movably contact with the top of the sieve plate.

[0014] Furthermore, the rotation of the stirring rod can drive the scraper to rotate, and when the scraper rotates, the top of the screen plate can be cleaned.

[0015] Preferably, a hollow plate is fixedly connected to the top of the shell, and the inner wall of the hollow plate is slidably connected to the outer walls of the two fixing rods.

[0016] Furthermore, the fixing rod can be conveniently limited by the hollow plate, so that the fixing rod can move laterally stably.

[0017] Preferably, a force storage spring is fixedly connected to the left side of the hollow plate, and the left side of the force storage spring is fixedly connected to the right side of the contact plate.

[0018] Furthermore, the elastic force of the force storage spring is utilized to conveniently drive the contact plate to move leftward and reset, and also drive the baffle to move leftward and reset.

[0019] Preferably, guide plates are symmetrically fixedly connected to the inner wall of the fixed box, and there are two guide plates, and the two cross bars pass through the two guide plates respectively.

[0020] Furthermore, the guide plate is used to limit the position of the crossbars so that the two crossbars can only slide left and right.

[0021] Preferably, the two guide plates are fixedly connected to the sides away from each other with return springs, and the sides away from each other of the two return springs are respectively fixedly connected to the sides of the two transverse plates close to each other.

[0022] Furthermore, the elastic force of the reset spring facilitates the pulling of the horizontal plate to reset the block, thereby driving the block to reset.

[0023] The beneficial effects of the present invention are:

[0024] 1. The motor drives the stirring rod to rotate and stir the sewage, the filter plate is used to filter and intercept the particles in the sewage, the medicine is used to put the medicine into the medicine tank to purify the sewage, the repeated components are used to control the medicine in the medicine tank to intermittently enter the shell, so that the medicine and water are fully mixed, and the fixing components are used to fix or unlock the filter plate, so that the filter plate can be disassembled and replaced;

[0025] 2. The lever rotates to contact the contact plate and pushes the contact plate to move right. When the contact plate moves, it drives the fixed rod to move horizontally. When the fixed rod moves right, it drives the baffle to move right. At this time, the movement of the baffle makes the medicine tank lose its restriction, so that the medicine in the medicine tank enters the shell;

[0026] 3. Rotating the knob will drive the transmission rod to rotate. When the transmission rod rotates, it will push the connecting rod and the auxiliary rod. At this time, the connecting rod and the auxiliary rod push the two cross bars to move away from each other. When the cross bar moves, it will push the cross plate. At this time, the two cross plates move away from each other and pull the two card blocks to move away from each other and disengage from the card slots. At this time, the filter plate will be unlocked;

[0027] The present invention cleans the sieve plate by driving the scraper to rotate while the stirring rod rotates, thereby preventing the sieve plate from being blocked and driving the baffle to move back and forth to fully mix the reagent and sewage. The sieve plate is fixed or unlocked by driving the card block to move by a knob, thereby achieving the effect of disassembling, assembling and replacing the sieve plate. The operation is simple and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the main structure of a sewage treatment device with multi-stage filtering and cleaning functions proposed by the present invention;

[0029] Figure 2 This is a schematic diagram of the main cross-section structure of a sewage treatment device with multi-stage filtering and cleaning functions proposed by the present invention;

[0030] Figure 3 The invention provides an attachment for a sewage treatment device with multi-stage filtering and cleaning functions. Figure 2 The structural diagram of part A in the figure;

[0031] Figure 4 This is a schematic diagram of the main cross-section structure of a fixed box of a sewage treatment device with multi-stage filtering and cleaning functions proposed by the present invention;

[0032] Figure 5This is a three-dimensional diagram of the contact plate, fixing rod and baffle of a sewage treatment device with multi-stage filtering and cleaning function proposed by the present invention.

[0033] In the figure: 1. shell; 2. support frame; 3. motor; 4. dosing tank; 5. stirring rod; 6. scraper; 7. sieve plate; 8. lever; 9. contact plate; 10. storage spring; 11. fixing rod; 12. baffle; 13. filter plate; 14. fixing box; 15. knob; 16. transmission rod; 17. connecting rod; 18. auxiliary rod; 19. cross bar; 20. cross plate; 21. guide plate; 22. reset spring; 23. block. DETAILED DESCRIPTION

[0034] The present invention will be further explained below in conjunction with specific embodiments.

[0035] refer to Figure 1-5 In this embodiment, a sewage treatment device with multi-stage filtering and cleaning functions is proposed, including a shell 1, a motor 3 and a filter plate 13. The top of the shell 1 is fixedly connected to a support frame 2, the motor 3 is fixedly connected to the top of the support frame 2, the output shaft of the motor 3 passes through the support frame 2, the bottom of the output shaft of the motor 3 is fixedly connected to a stirring rod 5, the bottom of the stirring rod 5 extends to the inside of the shell 1, the inner wall of the shell 1 is fixedly connected to a sieve plate 7, the top of the shell 1 is fixedly connected to a dosing tank 4, and the dosing tank 4 is connected to the shell 1, a reciprocating component is provided on the top of the shell 1, the filter plate 13 is movably connected to the inner wall of the shell 1, and the front side of the filter plate 13 extends to the outside of the shell 1, the front side of the shell 1 is fixedly connected to a fixed box 14, and the inner wall of the fixed box 14 is provided with a fixed component.

[0036] By means of the above mechanism: the motor 3 is used to conveniently drive the stirring rod 5 to rotate and stir the sewage, the filter plate 13 is used to conveniently filter and intercept the particulate matter in the sewage, the medicine is conveniently added through the medicine tank 4 to purify the sewage, the medicine in the medicine tank 4 is conveniently controlled to intermittently enter the housing 1 through the repeated assembly, so that the medicine and water are fully mixed, and the filter plate 13 is conveniently fixed or unlocked through the fixing assembly, so that the filter plate 13 can be disassembled and replaced;

[0037] In this embodiment, the reciprocating assembly includes a lever 8, a contact plate 9, two fixed rods 11 and a baffle 12; the lever 8 is fixedly connected to the outer wall of the stirring rod 5, the contact plate 9 is slidably connected to the top of the shell 1, the left side of the lever 8 is rotatably connected to a rotating wheel, the outer wall of the rotating wheel is in active contact with the left side of the contact plate 9, the two fixed rods 11 are respectively fixedly connected to the front and rear sides of the contact plate 9, the baffle 12 is slidably connected to the top of the shell 1, and the left side of the baffle 12 is fixedly connected to the right side of the two fixed rods 11, the outer wall of the medicine dosing tank 4 is fixedly connected to a sealing frame, the left side of the baffle 12 extends to the inside of the sealing frame, the lever 8 is rotated to contact the contact plate 9, and the contact plate 9 is pushed to move right, the contact plate 9 will be driven to move horizontally when the contact plate 9 moves, and the right movement of the fixed rod 11 will drive the baffle 12 to move right, at this time the movement of the baffle 12 makes the medicine dosing tank 4 lose its restriction, so that the medicine in the medicine dosing tank 4 enters the shell 1.

[0038] In this embodiment, the fixing assembly includes a knob 15, a transmission rod 16, a connecting rod 17, an auxiliary rod 18, two cross bars 19, two cross plates 20 and two blocks 23; the transmission rod 16 is rotatably connected to the inner wall of the fixed box 14, the knob 15 is fixedly connected to the front side of the transmission rod 16, and the front side of the knob 15 extends to the outside of the fixed box 14, the connecting rod 17 and the auxiliary rod 18 are both rotatably connected to the rear side of the transmission rod 16, the two cross plates 20 are symmetrically slidably connected to the inner wall of the fixed box 14, and the bottoms of the two cross plates 20 extend to the outside of the fixed box 14, the two cross bars 19 are respectively fixedly connected to the sides of the two cross plates 20 close to each other, and the front sides of the two cross bars 19 are respectively connected to the connecting rod 17 and the auxiliary rod 18. The rear side of the auxiliary rod 18 is rotatably connected, and the two card blocks 23 are respectively fixedly connected to the side where the two cross plates 20 are close to each other. Card slots are provided on the left and right sides of the filter plate 13, and the number of the card slots is two. The two card blocks 23 are adapted to the corresponding card slots. The rotation of the knob 15 will drive the transmission rod 16 to rotate. When the transmission rod 16 rotates, it will push the connecting rod 17 and the auxiliary rod 18. At this time, the connecting rod 17 and the auxiliary rod 18 push the two cross bars 19 to move to the side away from each other. When the cross bar 19 moves, it will push the cross plate 20. At this time, the two cross plates 20 move to the side away from each other and pull the two card blocks 23 to move to the side away from each other and disengage from the card slots. At this time, the filter plate 13 will be unlocked.

[0039] In this embodiment, a scraper 6 is fixedly connected to the bottom of the stirring rod 5, and the bottom of the scraper 6 is in active contact with the top of the sieve plate 7. The scraper 6 can be driven to rotate by the rotation of the stirring rod 5, and the top of the sieve plate 7 can be cleaned when the scraper 6 rotates.

[0040] In this embodiment, a hollow plate is fixedly connected to the top of the housing 1, and the inner wall of the hollow plate is slidably connected to the outer walls of the two fixing rods 11. The hollow plate is convenient for limiting the fixing rods 11 so that the fixing rods 11 can move laterally stably.

[0041] In this embodiment, a force storage spring 10 is fixedly connected to the left side of the hollow plate, and the left side of the force storage spring 10 is fixedly connected to the right side of the contact plate 9. The elastic force of the force storage spring 10 is utilized to conveniently drive the contact plate 9 to move left and reset, and drive the baffle 12 to move left and reset.

[0042] In this embodiment, the inner wall of the fixed box 14 is symmetrically fixedly connected with guide plates 21, and the number of guide plates 21 is two. The two cross bars 19 pass through the two guide plates 21 respectively. The guide plates 21 are used to limit the cross bars 19 so that the two cross bars 19 can only slide left and right.

[0043] In this embodiment, the two guide plates 21 are fixedly connected to the sides away from each other with return springs 22, and the sides away from each other of the two return springs 22 are respectively fixedly connected to the sides of the two cross plates 20 close to each other. Through the elastic force of the return springs 22, it is convenient to pull the cross plate 20 to reset, thereby driving the block 23 to reset.

[0044] Working principle: A water inlet is provided at the top of the housing 1. When sewage treatment is required, the sewage is poured into the housing 1 from the water inlet, and the medicine is added into the medicine tank 4. At this time, the motor 3 is started, and the motor 3 is powered by an external power supply. When the output shaft of the motor 3 rotates, the stirring rod 5 and the scraper 6 are driven to rotate. The stirring rod 5 rotates to stir the sewage and drives the lever 8 to rotate. When the scraper 6 rotates, it scrapes the top of the sieve plate 7 to prevent the sieve plate 7 from being blocked. When the lever 8 rotates, it contacts the contact plate 9 and pushes the contact plate 9 to move right. When the contact plate 9 moves, it compresses the storage spring 10. At the same time, when the contact plate 9 moves, it drives the fixing rod 11 to move horizontally. The rightward movement will drive the baffle 12 to move rightward. At this time, the movement of the baffle 12 makes the medicine-dosing tank 4 lose its restriction, so that the medicine in the medicine-dosing tank 4 enters the shell 1, and the medicine and the sewage are fully mixed by the rotation of the stirring rod 5. When the lever 8 is out of contact with the contact plate 9, the storage spring 10 loses its restriction and pushes the contact plate 9 to move left and reset. When the contact plate 9 is reset, it will drive the fixed rod 11 to move left, thereby driving the baffle 12 to move left and restrict the medicine-dosing tank 4, so that the medicine in the medicine-dosing tank 4 cannot flow out. The sewage preliminarily filtered by the sieve plate 7 will continue to flow, and the sewage will be adsorbed and filtered by the filter plate 13. The sewage filtered by the filter plate 13 will flow to the bottom of the shell 1, and the shell 1 is provided with a treatment water outlet on the left side, and the filtered water will be discharged from the water outlet. When the filter plate 13 needs to be replaced, the knob 15 is rotated at this time. The rotation of the knob 15 will drive the transmission rod 16 to rotate. When the transmission rod 16 rotates, it will push the connecting rod 17 and the auxiliary rod 18. At this time, the connecting rod 17 and the auxiliary rod 18 push the two cross bars 19 to move away from each other. When the cross bar 19 moves, it will push the cross plate 20. At this time, the two cross plates 20 move away from each other and stretch the reset spring 22, so that the reset spring 22 stretches and accumulates force. At the same time, the movement of the cross plate 20 will drive the two card blocks 23 to move away from each other and disengage from the card slot. At this time, the filter plate 13 will be unlocked, and the filter plate 13 can be pulled out and replaced. When installing a new filter plate 13, the new filter plate 13 is inserted into the housing 1, and the position of the card slot is aligned with the card block 23. At this time, the rotary knob 15 is reset. When the knob 15 is rotated, the transmission rod 16 is driven to rotate. At this time, the rotation of the transmission rod 16 will pull the connecting rod 17 and the auxiliary rod 18. At the same time, the two reset springs 22 lose their restrictions and drive the two cross plates 20 to move toward the side close to each other. When the cross plate 20 moves, it drives the card block 23 to move and reset and engage with the card slot. The filter plate 13 can be fixed by engaging the card block 23 with the card slot, thereby achieving the effect of disassembling and replacing the filter plate 13.

[0045] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A sewage treatment device with multi-stage filtering and cleaning functions, comprising a housing (1), a motor (3) and a filter plate (13), characterized in that: The top of the shell (1) is fixedly connected to a support frame (2), the motor (3) is fixedly connected to the top of the support frame (2), the output shaft of the motor (3) passes through the support frame (2), the bottom of the output shaft of the motor (3) is fixedly connected to a stirring rod (5), the bottom of the stirring rod (5) extends to the inside of the shell (1), the inner wall of the shell (1) is fixedly connected to a sieve plate (7), the top of the shell (1) is fixedly connected to a dosing tank (4), and the dosing tank (4) is connected to the shell (1), the top of the shell (1) is provided with a reciprocating component, the filter plate (13) is movably connected to the inner wall of the shell (1), and the front side of the filter plate (13) extends to the outside of the shell (1), the front side of the shell (1) is fixedly connected to a fixed box (14), and the inner wall of the fixed box (14) is provided with a fixed component.

2. A sewage treatment device with multi-stage filtering and cleaning function according to claim 1, characterized in that: The reciprocating assembly comprises a shifting rod (8), a contact plate (9), two fixing rods (11) and a baffle (12); The lever (8) is fixedly connected to the outer wall of the stirring rod (5), the contact plate (9) is slidably connected to the top of the shell (1), the left side of the lever (8) is rotatably connected to a rotating wheel, the outer wall of the rotating wheel is in active contact with the left side of the contact plate (9), the two fixed rods (11) are respectively fixedly connected to the front side and the rear side of the contact plate (9), the baffle (12) is slidably connected to the top of the shell (1), and the left side of the baffle (12) is fixedly connected to the right side of the two fixed rods (11), the outer wall of the medicine tank (4) is fixedly connected to a sealing frame, and the left side of the baffle (12) extends to the inside of the sealing frame.

3. A sewage treatment device with multi-stage filtering and cleaning function according to claim 1, characterized in that: The fixing assembly comprises a knob (15), a transmission rod (16), a connecting rod (17), an auxiliary rod (18), two cross rods (19), two cross plates (20) and two clamping blocks (23); The transmission rod (16) is rotatably connected to the inner wall of the fixed box (14); the knob (15) is fixedly connected to the front side of the transmission rod (16), and the front side of the knob (15) extends to the outside of the fixed box (14); the connecting rod (17) and the auxiliary rod (18) are both rotatably connected to the rear side of the transmission rod (16); the two transverse plates (20) are symmetrically slidably connected to the inner wall of the fixed box (14), and the bottoms of the two transverse plates (20) extend to the outside of the fixed box (14); the two transverse rods (19) are respectively fixedly connected to the sides of the two transverse plates (20) close to each other; the front sides of the two transverse rods (19) are respectively rotatably connected to the rear sides of the connecting rod (17) and the auxiliary rod (18); the two clamping blocks (23) are respectively fixedly connected to the sides of the two transverse plates (20) close to each other; the left and right sides of the filter plate (13) are both provided with clamping slots, and the number of the clamping slots is two, and the two clamping blocks (23) are adapted to the corresponding clamping slots.

4. A sewage treatment device with multi-stage filtering and cleaning function according to claim 1, characterized in that: The bottom of the stirring rod (5) is fixedly connected to a scraper (6), and the bottom of the scraper (6) is in active contact with the top of the sieve plate (7).

5. A sewage treatment device with multi-stage filtering and cleaning function according to claim 2, characterized in that: A hollow plate is fixedly connected to the top of the housing (1), and the inner wall of the hollow plate is slidably connected to the outer walls of the two fixing rods (11).

6. A sewage treatment device with multi-stage filtering and cleaning function according to claim 5, characterized in that: A force storage spring (10) is fixedly connected to the left side of the hollow plate, and the left side of the force storage spring (10) is fixedly connected to the right side of the contact plate (9).

7. The sewage treatment device with multi-stage filtering and cleaning function according to claim 3 is characterized in that: The inner wall of the fixed box (14) is symmetrically fixedly connected with guide plates (21), and the number of the guide plates (21) is two, and the two cross bars (19) respectively penetrate the two guide plates (21).

8. A sewage treatment device with multi-stage filtering and cleaning function according to claim 7, characterized in that: The sides of the two guide plates (21) that are away from each other are fixedly connected with a return spring (22), and the sides of the two return springs (22) that are away from each other are respectively fixedly connected to the sides of the two transverse plates (20) that are close to each other.

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