Mounting disc and bubble breaking strip thereof

Abstract

The utility model discloses a mounting disc and a bubble breaking strip thereof to break bubbles entrained in water gas, and relates to the technical field of dividers, the bubble breaking strip comprises a frame body and two pendulum bobs, the frame body comprises supporting frames and a rotating shaft, the supporting frames are located at the two ends of the rotating shaft and are provided with through holes for the rotating shaft to penetrate through, and the two pendulum bobs are arranged on the frame body. The supporting frame is further provided with a containing cavity used for containing the end of the rotating shaft so that the rotating shaft can rotate relative to the supporting frame, and blades are arranged in the circumferential direction of the rotating shaft to make contact with flowing water gas. The two pendulum bobs are arranged at the two ends of the rotating shaft in a central symmetry mode, so that the gravity centers of the two ends of the rotating shaft deviate up and down relative to the axis, water gas flowing from bottom to top makes contact with the blades arranged in the circumferential direction of the rotating shaft, the blades can be driven to move, and then the rotating shaft is driven to rotate by a certain angle; the rotating shaft can swing back and forth at a certain angle, so that the phenomena of dust accumulation and scaling of the bubble breaking strip are reduced, an airflow channel is prevented from being blocked, and stable bubble breaking efficiency can be kept for a long time.

Description

Technical Field

[0001] The utility model relates to the technical field of dividers, in particular to a mounting plate and a bubble breaking strip thereof. Background Art

[0002] With the development of coal chemical industry and coal-to-gas projects in my country, coal gasification technology has been more and more widely used in industrial sectors such as metallurgy, chemical industry, building materials, machinery and civil gas, and the gasifier is the key equipment in coal gasification technology.

[0003] Coal slurry or pulverized coal and oxygen enter the gasifier to react and produce synthesis gas; the synthesis gas enters the quenching chamber water bath through the downcomer, and undergoes heat and mass transfer with the quenching ring and the quenching water in the downcomer for quenching and cooling, and enters the bubbling bed through the expanded opening at the bottom of the downcomer. The bubbling bed is provided with a bubble separator to further achieve the purpose of washing, cooling and humidifying the synthesis gas, and to break the bubbles entrained in the water gas to reduce the water content of the synthesis gas.

[0004] The bubble separator is one of the main internal parts of the gasifier equipment. The bubble separator is composed of several layers of transverse dividing units. The dividing unit is composed of a bubble breaking strip with a triangular slit at the bottom. The bubble breaking strip is connected to the support ring, and the support ring is fixed on the gasifier shell. In order to prevent the vibration of the equipment caused by the movement of bubbles and the pressure relief of the system, the above components of the washing and cooling chamber must be firmly fixed, and the connection between the furnace shell and the bubble transverse dividing unit needs to be designed with embedded parts.

[0005] Due to water quality, coal type and structure of the bubble breaking strip, after a period of operation, different degrees of ash accumulation will appear on the bubble breaking strip, and the bubble breaking strip will be wrapped by ash and scale, and the jagged edge shape will be destroyed, which will not be able to effectively break the bubbles. Even the gap of the bubble breaking strip is blocked, which is easy to form a bridge, and even causes most of the bubble divider to be blocked during operation; the synthetic gas cannot be evenly distributed, causing the gasifier syngas to carry serious water, carrying a large amount of fly ash into the subsequent process system, increasing the difficulty of water vapor treatment in the later stage, and restricting the long-term operation of the gasifier. When the gasifier carries serious water, the liquid level of the gasifier will be reduced to the set value of the trip level, and the high-temperature synthetic gas will be directly sent out without a water bath, damaging the internal parts of the equipment and even causing safety accidents. At the same time, ash accumulation and scaling will increase the resistance of the bubble breaking strip. Affected by the pressure fluctuations of the gasifier during operation or the liquid level fluctuations of the quenching chamber, the bubble breaking strip will deform and fall off, resulting in the gasifier being unable to discharge slag and forced to stop, affecting the stable operation of the system and causing economic losses.

[0006] Therefore, how to propose a mounting plate and a bubble breaking strip thereof to reduce dust accumulation and scaling of the bubble breaking strip and avoid clogging of the air flow channel is a technical problem that technicians in this field currently need to solve. Utility Model Content

[0007] The utility model aims to provide a mounting plate and a bubble breaking strip thereof, so as to reduce dust accumulation and scaling of the bubble breaking strip, avoid blocking the air flow channel, and maintain a stable bubble breaking efficiency for a long time.

[0008] In order to achieve the above-mentioned purpose, the utility model provides a bubble breaking strip to break the water bubbles entrained in the water gas, and the bubble breaking strip comprises:

[0009] The frame body includes a support frame and a rotating shaft. The support frame is located at both ends of the rotating shaft and is provided with through holes for the rotating shaft to pass through. The support frame is also provided with a placement cavity for placing the end of the rotating shaft so that the rotating shaft can rotate relative to the support frame. The rotating shaft is provided with blade wings in the circumference to contact the flowing water gas.

[0010] Two pendulums are centrally symmetrically arranged at the two ends of the rotating shaft and are located in the placement cavity. The pendulums can rotate synchronously with the rotating shaft.

[0011] Preferably, the pendulum is a semi-cylinder having a through-hole, and the axis of the through-hole is perpendicular to the two bottom surfaces of the semi-cylinder. The circular hole is used for the shaft to pass through to fix the pendulum and the shaft.

[0012] Preferably, the rotating shaft and the pendulum are clearance-matched, and adhesive is filled between the rotating shaft and the pendulum, and the pendulum and the rotating shaft are welded and fixed after installation.

[0013] Preferably, a bearing is further provided inside the through hole, and the bearing comprises a bearing inner ring and a bearing outer ring which can rotate relative to each other, the bearing inner ring is fixedly sleeved on the outer periphery of the rotating shaft, and the bearing outer ring is fixedly provided in the through hole and fixedly connected to the support frame.

[0014] Preferably, the semi-cylinder also includes side surfaces and curved surfaces connected to the two bottom surfaces, the cross-section of the curved surface perpendicular to the extension direction of the rotating shaft is a semicircular arc, and the axis of the through hole intersects at the vertical line from the midpoint of the semicircular arc to the side surface, and the distance between the axis and the midpoint of the semicircular arc is twice the distance between the axis and the side surface.

[0015] Preferably, a plurality of blade wings are provided, and the plurality of blade wings are evenly arranged along the circumference of the rotating shaft.

[0016] Preferably, the blade wing is a plate-like structure and extends along the extension direction of the rotating shaft.

[0017] Preferably, a monitor and a vibrator are provided on the side of the pendulum away from the blade wing, the monitor can detect the swing information of the pendulum, and the monitor and the vibrator are both connected to the control board;

[0018] When the monitor detects that the pendulum is swinging within the first preset time period, the pendulum is operating normally and neither the control board nor the vibrator is activated;

[0019] When the monitor detects that the pendulum has not swung within the first preset time period, the information is fed back to the control board. After the control board controls the vibrator to drive the pendulum to swing for the second preset time period, the control board suspends the operation of the vibrator, and the monitor continues to detect whether the pendulum swings within the first preset time period.

[0020] Preferably, the frame and the pendulum are both made of stainless steel.

[0021] A mounting plate comprises a plurality of fan-shaped main frames which can be combined into a circular ring. The straight sides of the fan-shaped main frames are each provided with a plurality of mounting platforms, and a plurality of bubble-breaking strips are provided between two opposing mounting platforms.

[0022] Compared with the above-mentioned background technology, the bubble-breaking strip provided by the utility model is used to break the bubbles entrained in the water gas. The bubble-breaking strip includes a frame and two pendulums. The frame includes a support frame and a rotating shaft. The support frame is located at both ends of the rotating shaft and is provided with a through hole for the rotating shaft to pass through. The support frame is also provided with a placement cavity for placing the end of the rotating shaft so that the rotating shaft can rotate relative to the support frame. The rotating shaft is circumferentially provided with blades to contact the flowing water gas; the two pendulums are centrally symmetrically arranged at both ends of the rotating shaft and are located in the placement cavity. The pendulums can rotate synchronously with the rotating shaft.

[0023] Specifically, the pendulums symmetrically arranged at both ends of the rotating shaft make the center of gravity of the two ends of the rotating shaft shift up and down relative to the axis. The water gas flowing from bottom to top contacts the blade wings arranged circumferentially of the rotating shaft, which can drive the blade wings to move, and then drive the rotating shaft to rotate a certain angle. The setting of the pendulum can promote the rotation process, so that the rotating shaft can swing back and forth at a certain angle, so as to reduce the dust and scaling of the bubble breaking strips, avoid blockage of the air flow channel, and maintain a stable bubble breaking efficiency for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0025] FIG1 is a schematic diagram of the structure of a bubble breaking strip provided in an embodiment of the utility model;

[0026] FIG2 is a schematic diagram of the structure of a pendulum provided in an embodiment of the present utility model;

[0027] FIG3 is a schematic diagram of the structure of the rotating shaft and blade wings provided in an embodiment of the utility model;

[0028] FIG4 is a schematic structural diagram of the rotating shaft and the blade wings provided by an embodiment of the utility model from another perspective;

[0029] FIG. 5 is a schematic diagram of the structure of the installation disk provided in an embodiment of the utility model.

[0030] in:

[0031] 110-support frame, 111-placing cavity, 120-rotating shaft, 121-leaf wing;

[0032] 200- pendulum, 210- round hole, 220- bottom surface, 230- side surface, 240- arc surface;

[0033] 300- fan-shaped main frame, 310- installation platform. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0036] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the positions or elements referred to must have specific directions, be constructed and operate in specific directions, and therefore should not be understood as limitations of the present invention.

[0037] The utility model aims to provide a mounting plate and a bubble breaking strip thereof, so as to reduce dust accumulation and scaling of the bubble breaking strip, avoid blocking the air flow channel, and maintain a stable bubble breaking efficiency for a long time.

[0038] Please refer to Figure 1. In order to achieve the above-mentioned purpose, the utility model provides a bubble-breaking strip to break the bubbles entrained in the water gas. The bubble-breaking strip includes a frame and two pendulums 200. The frame includes a support frame 110 and a rotating shaft 120. The support frame 110 is located at both ends of the rotating shaft 120 and is provided with a through hole for the rotating shaft 120 to pass through. The support frame 110 is also provided with a placement cavity 111 for placing the end of the rotating shaft 120 so that the rotating shaft 120 can rotate relative to the support frame 110. The rotating shaft 120 is circumferentially provided with blade wings 121 to contact the flowing water gas; the two pendulums 200 are centrally symmetrically arranged at both ends of the rotating shaft 120 and are located in the placement cavity 111. The pendulums 200 can rotate synchronously with the rotating shaft 120.

[0039] Among them, the support frame 110 specifically includes a U-shaped outer frame and an inner frame plate connected to two parallel surfaces of the U-shaped outer frame. The specific U-shaped outer frame is an integrated structure. Through the bending process of the plate body, the U-shaped outer frame has two parallel surfaces parallel to each other and a vertical surface connected to the two parallel surfaces. The vertical surface is preferably perpendicular to the two parallel surfaces. The through hole is preferably arranged in the middle of the inner frame plate. A placement cavity 111 is formed between the U-shaped outer frame and the inner frame plate. According to actual needs, mounting holes can be arranged on the vertical surface for fixing the entire support frame 110 to the external structure, and bolts and nuts are preferably used to achieve a detachable connection of the support frame 110.

[0040] Specifically, the pendulum 200 is symmetrically arranged at both ends of the rotating shaft 120, so that the center of gravity of the two ends of the rotating shaft 120 is offset up and down relative to the axis. The water gas flowing from bottom to top contacts the blade wings 121 arranged circumferentially of the rotating shaft 120, which can drive the blade wings 121 to move, and then drive the rotating shaft 120 to rotate a certain angle. The setting of the pendulum 200 can promote the rotation process, so that the rotating shaft 120 can swing back and forth at a certain angle, so as to reduce dust and scaling of the bubble breaking strip, avoid blockage of the air flow channel, and maintain a stable bubble breaking efficiency for a long time.

[0041] Please refer to Figure 2. Preferably, the pendulum 200 is specifically a semi-cylinder, which is provided with a through-type circular hole 210, and the axis of the through hole is perpendicular to the two bottom surfaces 220 of the semi-cylinder. The circular hole 210 is used for the rotation shaft 120 to pass through to fix the pendulum 200 and the rotation shaft 120.

[0042] In this embodiment, the pendulum 200 is preferably a semi-cylinder, and can be cut vertically into two equally divided semi-cylinders from the same cylinder to obtain two pendulums 200. This can facilitate the processing and use of the pendulum 200. By opening a through-type circular hole 210 with an axis perpendicular to the two bottom surfaces 220 of the semi-cylinder in the semi-cylindrical pendulum 200, the pendulum 200 is sleeved on the outer periphery of the end of the rotating shaft 120, so as to enable the pendulum 200 and the rotating shaft 120 to move synchronously.

[0043] In addition, the shape of the pendulum 200 may be adjusted according to actual needs as long as the above-mentioned purpose can be achieved.

[0044] Preferably, the rotating shaft 120 and the pendulum 200 are clearance-fitted, and adhesive is filled between the rotating shaft 120 and the pendulum 200 , and the pendulum 200 and the rotating shaft 120 are welded and fixed after installation.

[0045] Among them, it is preferred that the rotating shaft 120 and the pendulum 200 are clearance-fitted to facilitate the installation of the pendulum 200. By filling adhesive between the rotating shaft 120 and the pendulum 200 with clearance fit, the connection effect between the pendulum 200 and the rotating shaft 120 is increased. In order to further enhance the stability of the connection between the rotating shaft 120 and the pendulum 200, it is preferred that the pendulum 200 and the rotating shaft 120 are welded and fixed.

[0046] It should be noted that an interference fit may also be used between the rotating shaft 120 and the pendulum 200 to achieve a fixed connection between the rotating shaft 120 and the pendulum 200. In this case, the above-mentioned adhesive adding process and the welding process after installation can be omitted.

[0047] Preferably, a bearing is further provided inside the through hole, and the bearing includes a bearing inner ring and a bearing outer ring that can rotate relative to each other. The bearing inner ring is fixedly sleeved on the outer periphery of the rotating shaft 120, and the bearing outer ring is fixedly provided in the through hole and fixedly connected to the support frame 110.

[0048] It can be understood that in order to increase the rotation effect of the rotating shaft 120 and reduce the rotation resistance of the rotating shaft 120 during the rotation process, a bearing is preferably provided inside the through hole, and the bearing includes a bearing inner ring and a bearing outer ring that can rotate relative to each other. By connecting the rotating shaft 120 and the support frame 110 to the bearing inner ring and the bearing outer ring respectively, the rotating shaft 120 can rotate better relative to the through hole.

[0049] At the same time, a limiting structure can be provided on the support frame 110, and the limiting structure is located on both sides of the bearing to limit the bearing from being separated from the through hole, thereby increasing the stability of the entire frame.

[0050] Preferably, the semi-cylinder also includes a side surface 230 and an arc surface 240 connected to the two bottom surfaces 220, the cross-section of the arc surface 240 perpendicular to the extension direction of the rotating shaft 120 is a semicircular arc, and the axis of the through hole intersects at the perpendicular line from the midpoint of the semicircular arc to the side surface 230, and the distance between the axis and the midpoint of the semicircular arc is twice the distance between the axis and the side surface 230.

[0051] In one embodiment, the semi-cylinder also includes a side surface 230 and an arc surface 240 connected to the two bottom surfaces 220. By setting the cross-section of the arc surface 240 to a semicircular arc, and the axis of the through hole intersecting at the perpendicular line from the midpoint of the semicircular arc to the side surface 230, the through hole is arranged on the symmetry axis of the bottom surface 220, and preferably, the distance between the axis of the through hole and the midpoint of the semicircular arc is twice the distance between the axis and the side surface 230. The multiple relationship can also be adjusted according to actual needs as long as the above purpose can be achieved.

[0052] Please refer to FIG. 3 and FIG. 4 . Preferably, a plurality of blade wings 121 are provided, and the plurality of blade wings 121 are evenly arranged along the circumference of the rotating shaft 120 .

[0053] In this embodiment, multiple blade wings 121 are evenly arranged along the circumference of the rotating shaft 120. Preferably, the number of blade wings 121 is three, and the angles between the three blade wings 121 are all 120 degrees. At the same time, it can be ensured that the projections of the blade wings 121 and the rotating shaft 120 in the horizontal plane have a certain width, which is used to ensure the contact area between the blade wings 121 and the water bubble.

[0054] Preferably, the blade wing 121 is a plate-shaped structure and extends along the extension direction of the rotating shaft 120 .

[0055] Among them, the leaf wing 121 is preferably a plate-like structure, and the length of the leaf wing 121 is adapted to the rotating shaft 120. In other words, the length of the leaf wing 121 along the extension direction of the rotating shaft 120 is slightly smaller than the distance between the two inner frame plates to ensure the contact range between the leaf wing 121 and the bubble. In addition, the end of the leaf wing 121 away from the rotating shaft 120 can also be set to a serrated shape to achieve the above purpose.

[0056] Preferably, a monitor and a vibrator are provided on the side of the pendulum 200 away from the blade wing 121, and the monitor can detect the swing information of the pendulum 200, and both the monitor and the vibrator are connected to the control board; when the monitor detects that the pendulum 200 is swinging within the first preset time period, the pendulum 200 operates normally, and the control board and the vibrator are not started; when the monitor detects that the pendulum 200 has not swung within the first preset time period, the information is fed back to the control board, and the control board controls the vibrator to drive the pendulum 200 to swing for the second preset time period. Then, the control board suspends the operation of the vibrator, and the monitor continues to detect whether the pendulum 200 swings within the first preset time period.

[0057] The monitor can detect the swinging condition of the pendulum 200 in real time. When the monitor detects that the pendulum 200 has not swung within a certain time range, the information is transmitted to the control board so that the vibrator drives the pendulum 200 to swing, thereby increasing the bubble breaking effect. After a period of time, the control board will control the vibrator to stop running so that the monitor can continue to detect whether the pendulum 200 is swinging. If the pendulum 200 is always swinging within a certain time range, the vibrator is not needed to assist the swinging. If the pendulum 200 has not swung within a certain time range, the vibrator will continue to be controlled to assist the swinging, and the cycle will continue.

[0058] Preferably, the frame and the pendulum 200 are both made of stainless steel.

[0059] It should be noted that the frame and the pendulum 200 are preferably made of stainless steel to slow down or even avoid corrosion of the frame and the pendulum 200 during use and increase the service life of the frame and the pendulum 200. The frame and the pendulum 200 can also be replaced with other materials as long as the above purpose can be achieved.

[0060] Please refer to Figure 5. This embodiment also includes a mounting plate, including a plurality of fan-shaped main frames 300 that can be combined into a circular ring. The straight sides of the fan-shaped main frames 300 are each provided with a plurality of mounting platforms 310, and a plurality of the above-mentioned bubble breaking strips are provided between two opposing mounting platforms 310.

[0061] Among them, the preferred mounting plate includes six fan-shaped main frames 300, and the straight sides of the six fan-shaped main frames 300 are sequentially connected to form a full circle. The preferred mounting platform 310 is evenly arranged along the extension direction of the straight sides of the fan-shaped main frames 300, and the mounting platform 310 is connected to the support frame 110 closest to it to support a number of bubble-breaking strips located between and connected to the opposite mounting platforms 310. Preferably, adjacent bubble-breaking strips are connected by bolts passing through the support frame 110.

[0062] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0063] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0064] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the method and core ideas of the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the utility model.

Claims

1. A bubble breaking strip for breaking bubbles entrained in water gas, characterized in that: The bubble breaking strip comprises: A frame body, comprising a support frame (110) and a rotating shaft (120), wherein the support frame (110) is located at both ends of the rotating shaft (120) and is provided with through holes for the rotating shaft (120) to pass through, and the support frame (110) is further provided with a placement cavity (111) for placing an end of the rotating shaft (120) so that the rotating shaft (120) can rotate relative to the support frame (110), and the rotating shaft (120) is provided with blade wings (121) in the circumferential direction so as to contact the flowing water gas; Two pendulums (200) are centrally symmetrically arranged at two ends of the rotating shaft (120) and are located in the placement cavity (111); the pendulums (200) are capable of rotating synchronously with the rotating shaft (120).

2. The bubble breaking strip according to claim 1, characterized in that: The pendulum (200) is specifically a semi-cylinder, the semi-cylinder is provided with a through-type circular hole (210), and the axis of the through hole is perpendicular to the two bottom surfaces (220) of the semi-cylinder, and the circular hole (210) is used for the rotation shaft (120) to pass through, so as to fix the pendulum (200) and the rotation shaft (120).

3. The bubble breaking strip according to claim 2, characterized in that: The rotating shaft (120) and the pendulum (200) are clearance-matched, and adhesive is filled between the rotating shaft (120) and the pendulum (200). After installation, the pendulum (200) and the rotating shaft (120) are welded and fixed.

4. The bubble breaking strip according to claim 1, characterized in that: A bearing is also provided inside the through hole, the bearing comprising a bearing inner ring and a bearing outer ring which are relatively rotatable, the bearing inner ring being fixedly sleeved on the outer circumference of the rotating shaft (120), the bearing outer ring being fixedly provided in the through hole and fixedly connected to the support frame (110).

5. The bubble breaking strip according to claim 2, characterized in that: The semi-cylinder further comprises a side surface (230) and a curved surface (240) connected to the two bottom surfaces (220); the cross section of the curved surface (240) perpendicular to the extension direction of the rotating shaft (120) is a semicircular arc, and the axis of the through hole intersects with a perpendicular line from the midpoint of the semicircular arc to the side surface (230); the distance between the axis and the midpoint of the semicircular arc is twice the distance between the axis and the side surface (230).

6. The bubble breaking strip according to claim 1, characterized in that: A plurality of blade wings (121) are provided, and the plurality of blade wings (121) are evenly arranged along the circumference of the rotating shaft (120).

7. The bubble breaking strip according to claim 6, characterized in that: The blade wing (121) is specifically a plate-shaped structure, and extends along the extension direction of the rotating shaft (120).

8. The bubble breaking strip according to claim 1, characterized in that: A monitor and a vibrator are provided on a side of the pendulum (200) facing away from the blade wing (121), the monitor being capable of detecting swing information of the pendulum (200), and the monitor and the vibrator being both connected to a control panel; When the monitor detects that the pendulum (200) is swinging within a first preset time period, the pendulum (200) is operating normally, and neither the control panel nor the vibrator is started; When the monitor detects that the pendulum (200) has not swung within a first preset time period, the information is fed back to the control board. After the control board controls the vibrator to drive the pendulum (200) to oscillate for a second preset time period, the control board pauses the operation of the vibrator, and the monitor continues to detect whether the pendulum (200) oscillates within the first preset time period.

9. The bubble breaking strip according to any one of claims 1 to 8, characterized in that: The frame and the pendulum (200) are both made of stainless steel.

10. A mounting plate, comprising a plurality of fan-shaped main frames (300) that can be combined into a ring, characterized in that: A plurality of mounting platforms (310) are provided on the straight sides of the fan-shaped main frame (300), and a plurality of bubble breaking strips according to any one of claims 1 to 9 are provided between two opposing mounting platforms (310).

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