Activated carbon adsorption device for environmental protection engineering

Abstract

The invention discloses an activated carbon adsorption device for environmental protection engineering, and belongs to the technical field of activated carbon equipment. The sleeve comprises an outer sleeve body and an inner sleeve body, the outer sleeve body is externally connected to the outer surface of the inner sleeve body, an inward bend is formed at the top of the outer sleeve body, and threaded half slotted holes are formed in the top of the inner sleeve body and the side wall of the joint of the outer sleeve body and the inner sleeve body. The threaded half slotted hole in the outer sleeve and the threaded half slotted hole in the inner sleeve are combined with each other to form a threaded circular material placing through groove; by arranging the inner sleeve and the outer sleeve, the structure can be installed on an indoor pipeline through cooperation of the top threaded plug and the bottom threaded plug, flowing of air in the pipeline can be achieved without external draught fans and equipment, and meanwhile indoor air particulate matter adsorption can be achieved; the outer tower barrel is screwed into the outer portion of the inner sleeve through the top threads, limiting of the outer barrel is achieved through the top thread plug, and therefore the outer barrel and the inner sleeve are convenient to disassemble.

Description

Technical Field

[0001] This invention belongs to the field of activated carbon equipment technology, specifically relating to an activated carbon adsorption device for environmental engineering. Background Technology

[0002] Activated carbon is amorphous carbon that has undergone activation treatment. It exists in powder, granular, or pellet form and has strong adsorption capacity. The activation treatment removes various oils and impurities from the surface of the amorphous carbon, increasing its pore number, surface area, and surface activity, thereby enabling it to adsorb many gases, liquids, or certain solutes in solutions.

[0003] Activated carbon has a wide range of applications, and its use in environmental protection projects is quite common. In indoor ventilation ducts and environments with strong odors, activated carbon can be installed to increase the adsorption of impurities and moisture in the indoor air, thus providing a coarse filter for the air. The structure should also allow for easy replacement of the internal activated carbon, as well as convenient overall replacement and maintenance. Summary of the Invention

[0004] The present invention mainly addresses the technical problems existing in the prior art and provides an activated carbon adsorption device for environmental protection engineering.

[0005] The above-mentioned technical problems of the present invention are mainly solved by the following technical solution: an activated carbon adsorption device for environmental protection engineering, including an outer sleeve and an inner sleeve, the outer sleeve being connected to the outer surface of the inner sleeve, the top of the outer sleeve having an inward bend, the top of the inner sleeve, and the side wall at the connection between the outer sleeve and the inner sleeve having threaded semi-grooves, and the threaded semi-grooves on the outer sleeve and the inner sleeve combining to form a threaded circular material passage, the top of the material passage penetrating the inner sleeve inward to form a top through hole, the top of the material passage penetrating the inner sleeve inward to form a bottom through hole, and a material blocking structure being provided at both the top through hole and the bottom through hole, multiple auxiliary holes surrounding the material passage being provided on the outer side of the outer sleeve and the inner wall of the inner sleeve, an inner plane portion being provided at the middle position of the inner wall of the inner sleeve, an inner platform being fixedly provided on the inner plane portion, a ventilation cavity being provided at the inner ring of the inner platform, and an air guiding structure being provided on the inner platform.

[0006] Preferably, the top of the inner sleeve is integrally provided with a top threaded plug, the bottom of the inner sleeve is integrally provided with a bottom threaded plug, the top of the outer sleeve forms an inward bend, and is threadedly connected to the top threaded plug through the bend, and a sealing ring is fitted at the bottom of the connection between the outer sleeve and the inner sleeve.

[0007] Preferably, the top of the outer sleeve has two recessed grooves, and each of the recessed grooves on both sides has a handle that can be rotated.

[0008] Preferably, the blocking structure includes a fixed platform, which is disposed on the inner wall of the inner sleeve and is disposed on one side corresponding to the top through hole and the bottom through hole. A first sliding groove is provided in the fixed platform, and a connecting rod is slidably disposed in the first sliding groove. An outer fitting block is disposed at the bottom of the connecting rod, and a blocking block for sealing the top through hole or the bottom through hole is disposed on one side of the outer fitting block.

[0009] Preferably, the material placement channel is threaded, forming a multi-layered annular interconnected arrangement. The auxiliary holes in a single layer of the material placement channel are divided into multiple groups, and each group of auxiliary holes consists of two holes, one of which faces upward and the other faces downward.

[0010] Preferably, the inner sleeve has multiple air guide grooves at the top and bottom of the inner plane portion, and the inward-facing side of the air guide groove forms an outward-flaring opening with the inner sleeve. Multiple sets of auxiliary holes on the inner sleeve are opened in the multiple air guide grooves.

[0011] Preferably, the air guiding structure includes multiple rollers, which are inserted through and inserted into the top of the inner platform. Multiple fan blades are inserted into the surface of the rollers. An inner ring is fitted into the inner ring of the inner platform. The bottom of the inner ring is bent towards the bottom of the inner platform to form a flat plate. A first through groove is opened on the flat plate corresponding to the insertion point of the roller and the inner platform. A coupling is provided for the roller to penetrate the inner platform downward.

[0012] Preferably, the inner ring is provided with multiple motor mounting brackets, which are provided corresponding to the first through slot and extend downward to the bottom of the coupling. A motor connected to the coupling is installed on the motor mounting bracket. A power gear is sleeved on the bottom surface of the roller shaft. Multiple meshing auxiliary gears are provided on the adjacent flat plate. The auxiliary gears on both sides mesh with the power gears on both sides.

[0013] Preferably, a horizontal frame is provided on the side of the inner ring corresponding to the ventilation cavity. The horizontal frame is fixedly connected to the inner ring. A second through groove is provided on both sides of the horizontal frame. A positioning pin is slidably inserted into the second through groove. One end of the positioning pin passes through the inner ring and is inserted into the inner platform. A plug seat is provided on the other end of the positioning pin. A slider is provided on both sides of the plug seat. A second sliding groove is provided on the horizontal frame corresponding to the slider on both sides. The slider extends outward through the second sliding groove. A fixing block is provided on the side of the horizontal frame facing the inner ring, flush with the slider. An elastic rope is connected between the fixing block and the slider.

[0014] The beneficial effects of this invention are as follows: 1. By setting an inner sleeve and an outer sleeve, this structure can be installed on indoor pipes through the cooperation of a top threaded plug and a bottom threaded plug. It can realize the air flow inside the pipe without the need for external fans and equipment, and at the same time, it can also achieve the adsorption of indoor air particles. The outer sleeve is screwed into the outside of the inner sleeve by the top thread, and the outer sleeve is limited by the top threaded plug, making it easy to disassemble the outer sleeve and the inner sleeve. Then, by opening threaded half-grooves on the side wall of the connection between the inner sleeve and the outer sleeve, the two sets of threaded half-grooves form a material channel for filling activated carbon. The threaded material channel design allows the activated carbon to better clump together by compression when adsorption is replaced, so that when the inner sleeve and the outer sleeve are separated, the activated carbon scatters less and falls more easily as clumps, making it easier to collect. At the same time, the material channel corresponds to multiple sets of auxiliary holes on the inner sleeve and the outer sleeve. Each set of auxiliary holes has two holes, one facing up and one facing down, so that they have a better contact area with the air and increase the adsorption of substances in the air.

[0015] 2. By setting an inner plane and air guide structure in the middle of the inner sleeve, which is fixed to the inner plane by an inner platform, and inserting an inner ring and a flat plate into the inner platform to increase the tightness of the connection with the inner platform, multiple rollers and fan blades are set through the inner platform. The rollers are rotated by the drive gear at the bottom and the motor on the motor mounting bracket. The number of motors can be increased or decreased according to the power requirements. Multiple rollers can achieve one-to-many rotation through the meshing of the drive roller gear and the corresponding auxiliary gear. The rotation of the rollers and the surface fan blades can absorb air through the air guide grooves on the inner sleeve, which not only realizes the rapid circulation of air inside the inner sleeve, but also increases the negative pressure through the multiple auxiliary holes on the air guide grooves, thereby realizing the adsorption of air inward through the auxiliary holes on the outer sleeve, and increasing the overall adsorption effect of the workpiece.

[0016] 3. By connecting the motor mounting bracket and roller shaft to the inner ring and plate, and the crossbar set on the inner ring, the air guide structure and the inner platform are installed through the positioning pins. This makes installation convenient, and the subsequent disassembly and replacement of the air guide structure are also more convenient. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the inner sleeve of the present invention; Figure 3 This is a cross-sectional structural schematic diagram of the present invention; Figure 4 This is a three-dimensional structural diagram of the air guiding structure of the present invention; Figure 5This is a three-dimensional structural diagram of the present invention without the internal platform air guide structure installed; Figure 6 This is a three-dimensional structural diagram of the present invention from the bottom view without the internal platform air guide structure installed; Figure 7 This is a three-dimensional structural diagram of the plugging material structure of the present invention; Figure 8 yes Figure 5 A magnified structural diagram of point A. In the diagram: 1. Outer sleeve; 11. Auxiliary hole; 12. Inner groove; 13. Handle; 2. Inner sleeve; 21. Air guide groove; 22. Top threaded plug; 23. Bottom threaded plug; 24. Threaded half-groove hole; 241. Material placement groove; 25. Top through hole; 26. Bottom through hole; 27. Inner plane; 3. Material blocking structure; 31. Fixed platform; 32. First sliding groove; 33. Connecting rod; 34. Outer insert block; 35. Material blocking block; 4. Air guide structure. ; 41. Inner platform; 42. Inner ring; 43. Flat plate; 431. First through slot; 44. Motor mounting bracket; 45. Coupling; 46. Roller shaft; 461. Fan blade; 47. Ventilation cavity; 48. Cross frame; 481. Second through slot; 482. Positioning pin; 483. Plug-in socket; 484. Second slide groove; 485. Slider; 486. Fixing block; 487. Elastic rope; 49. Power gear; 410. Motor; 411. Auxiliary gear. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figures 1-7 The present invention provides a technical solution: An activated carbon adsorption device for environmental engineering includes an outer sleeve 1 and an inner sleeve 2. The outer sleeve 1 is externally connected to the outer surface of the inner sleeve 2. The device is characterized by: an inwardly bent top on the outer sleeve 1; threaded semi-grooves 24 on the top of the inner sleeve 2 and on the sidewalls where the outer sleeve 1 and inner sleeve 2 connect; and the threaded semi-grooves 24 on the outer sleeve 1 and the inner sleeve 2 combine to form a threaded circular material passage 241. The material passage 241 is filled with activated carbon for adsorption, and a thin filter screen is installed on the outer wall of the corresponding threaded semi-grooves 24 of the inner sleeve 2 to prevent the activated carbon from being absorbed. Some of the dust is adsorbed into the inner sleeve 2 through the auxiliary hole 11. The top of the material passage 241 penetrates the inner sleeve 2 and forms a top through hole 25. The top of the material passage 241 penetrates the inner sleeve 2 and forms a bottom through hole 26. Both the top through hole 25 and the bottom through hole 26 are provided with a material blocking structure 3. Multiple auxiliary holes 11 are provided around the material passage 241 on the outer side of the outer sleeve 1 and the inner wall of the inner sleeve 2. An inner plane part 27 is provided in the middle of the inner wall of the inner sleeve 2. An inner platform 41 is fixedly provided on the inner plane part 27. A ventilation cavity 47 is provided in the inner ring of the inner platform 41. An air guide structure 4 is provided on the inner platform 41.

[0021] The top of the inner sleeve 2 is integrally provided with a top threaded plug 22, and the bottom of the inner sleeve 2 is integrally provided with a bottom threaded plug 23. The top of the outer sleeve 1 forms an inward bend, and is threadedly connected to the top threaded plug 22 through the bend. A sealing ring is fitted at the bottom of the connection between the outer sleeve 1 and the inner sleeve 2. The sealing ring increases the tightness of the connection between the bottom of the inner sleeve 2 and the outer sleeve 1, and prevents the gap between the two from being too large.

[0022] The top of the outer sleeve 1 has two recessed grooves 12, and each recessed groove 12 on both sides is equipped with a handle 13 that can be flipped. When the structure is disassembled, the outer sleeve can be rotated by flipping the two handles 13 on the outer sleeve 1. At the same time, the handles 13 also make it convenient to pick up and take out the device.

[0023] The plugging structure 3 includes a fixed platform 31, which is set on the inner wall of the inner sleeve 2 and is positioned on one side corresponding to the top through hole 25 and the bottom through hole 26. A first sliding groove 32 is formed in the fixed platform 31, and a connecting rod 33 is slidably arranged in the first sliding groove 32. An outer fitting block 34 is provided at the bottom of the connecting rod 33. A plugging block 35 is provided on one side of the outer fitting block 34 to block the top through hole 25 or the bottom through hole 26. The plugging structure 3 can plug the top through hole 25 and the bottom through hole 26 to prevent activated carbon from overflowing from both sides. At the same time, in subsequent use, the internal activated carbon can also be replenished through the top through hole 25 and the bottom through hole 26.

[0024] The material feeding channel 241 is threaded, forming a multi-layered annular interconnected arrangement. The auxiliary holes 11 in the single-layer material feeding channel 241 are divided into multiple groups, and each group of auxiliary holes 11 has two holes, one facing upward and the other facing downward. The inner sleeve 2 has multiple air guide channels 21 at the top and bottom of the inner plane portion 27. The side of the air guide channel 21 facing inward forms an outward flared opening with the inner sleeve 2. The multiple groups of auxiliary holes 11 on the inner sleeve 2 are all opened in the multiple air guide channels 21. The design of the air guide channels 21 and the flared opening increases the strength of the air force in the air guide channels 21 when the roller 46 and the fan blade 461 rotate, thereby better drawing air inward.

[0025] The air guide structure 4 includes multiple rollers 46, which are inserted through and inserted into the top of the inner platform 41. Multiple fan blades 461 are inserted into the surface of each roller 46. An inner ring 42 is fitted onto the inner ring of the inner platform 41. The bottom of the inner ring 42 is bent towards the bottom of the inner platform 41 to form a flat plate 43. A first through groove 431 is provided on the flat plate 43 corresponding to the insertion point of the roller 46 and the inner platform 41. A coupling 45 is provided through the roller 46 downwards through the inner platform 41. The coupling 45 is connected to the inner platform 41 via a bearing. During subsequent disassembly, the bearing and coupling 45 simultaneously and quickly detach from the inner platform 41. Multiple motor mounting brackets 44 are provided on the inner ring 42, corresponding to the first through groove 431. The motor mounting brackets 44 extend downwards to the bottom of the coupling 45, and a motor 410 connected to the coupling 45 is mounted on the motor mounting bracket 44. The bottom surface of the roller 46 is fitted with... There is a power gear 49, and multiple meshing auxiliary gears 411 are provided on the adjacent flat plate 43. The auxiliary gears 411 on both sides mesh with the power gears 49 on both sides. A cross frame 48 is provided laterally on the side of the inner ring 42 corresponding to the ventilation cavity 47. The cross frame 48 is fixedly connected to the inner ring 42. A second through groove 481 is provided on both sides of the cross frame 48. A positioning pin 482 is slidably inserted into the second through groove 481. One end of the positioning pin 482 passes through the inner ring 42 and is inserted into the inner platform 41. A plug seat 483 is provided on the other end of the positioning pin 482. A slider 485 is provided on both sides of the plug seat 483. A second slide groove 484 is provided on the cross frame 48 corresponding to the slider 485 on both sides. The slider 485 extends outward through the second slide groove 484. A fixing block 486 is provided on the side of the cross frame 48 facing the inner ring and flush with the slider 485. An elastic rope 487 is connected between the fixing block 486 and the slider 485.

[0026] Working principle: This structure can be installed inside indoor ventilation ducts. A section of the same duct is cut and replaced with this device. It is connected to the duct via a top threaded plug 22 and a bottom threaded plug 23. Internally, to meet the required airflow, a corresponding number of synchronous motors 410 are installed on the corresponding motor mounting bracket 44. The motors 410 are controlled by a controller, and electricity is supplied through a conduit connected to the indoor wiring. The motors 410 then drive the output end of the roller shaft 46, connected via a coupling 45, to rotate. The fan blades 461 on the surface of the roller shaft 46 then rotate. If not every roller shaft 46 has a fan blade 461... When there is a motor 410, the power gear 49 on the roller 46 on which the motor 410 is installed drives the auxiliary gears 411 on both sides to rotate. The auxiliary gears 411 drive multiple auxiliary gears 411 to rotate at one time, thereby realizing the rotation of the other active gears that are not equipped with motors 410. This increases the air pressure in the ventilation slot, allowing the indoor air to be drawn into the inner sleeve 2 through the multiple sets of auxiliary holes 11 on the inner sleeve 2 and the outer sleeve 1. During the intake process, the air is filtered by the activated carbon in the material channel. Then, the air is discharged or circulated inside the pipe by the lift generated by the rotation of the fan blades 461. When the activated carbon inside the inner pipe needs to be replaced, the structure is removed from the pipe by rotating it. When the structure is connected to the pipe, an auxiliary sleeve can be inserted into the pipe. The structure is threadedly connected to the auxiliary sleeve for easy disassembly. Then, the two sets of handles 13 at the top of the outer sleeve 1 are opened, and the handles 13 are rotated to rotate the outer sleeve upwards, causing the top bend to disengage from the top threaded plug 22. The inner sleeve 2 can then be pulled out or rotated to separate from the outer sleeve 1. At this time, the activated carbon inside has formed small clumps due to long-term adsorption and compression, thus preventing the activated carbon from scattering when it is removed. The activated carbon inside is then cleaned. Next, the filter screen on the outer wall of the inner sleeve 2 is removed and cleaned simultaneously. Then, the outer sleeve is screwed back into the inner sleeve 2. At this time, the blocking blocks 35 in the top through hole 25 and bottom through hole 26 are removed by sliding the connecting rod 33 and the bottom outer fitting block 34. Then, new activated carbon is injected into the material channel through the equipment, and then the blocking blocks 35 are used to seal the channel again. The entire material replacement is completed.

[0027] When the air guide structure 4 needs to be replaced, after the material replacement is completed, simply insert one hand into the bottom of the inner sleeve 2, insert two fingers into the two insertion seats 483, and then pull the insertion seats 483 towards the same side to disengage the positioning pins 482 connected to the insertion seats 483 from the inner platform 41. After the inner ring 42 loses its connection with the inner platform 41, grasp the crossbeam 48 outward and pull the inner ring 42 to disengage it from the inner platform 41. At the same time, the multiple first through slots 431 opened on the rear flat plate 43 can correspond to the bottom. The material blocking structure 3 facilitates the complete removal of the air guide structure 4 from the inner material cylinder, allowing for maintenance and replacement of the air guide structure 4. When reinserting, multiple rollers 46 align with the holes on the inner platform 41, and the plate 43 contacts the inner platform 41. Then, the insertion seat 483 is released, and the sliders 485 on both sides of the insertion seat 483 are pulled by the elastic rope 487, causing the sliders 485 to move along the second slide groove 484 toward the fixed block 486, thereby achieving the insertion of the positioning pin 482 into the inner platform 41 and completing the installation.

[0028] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An activated carbon adsorption device for environmental engineering, comprising an outer sleeve (1) and an inner sleeve (2), wherein the outer sleeve (1) is externally connected to the outer surface of the inner sleeve (2), characterized in that: The top of the outer sleeve (1) has an inward bend. The top of the inner sleeve (2) and the side wall at the connection between the outer sleeve (1) and the inner sleeve (2) are both provided with threaded semi-grooves (24). The threaded semi-grooves (24) on the outer sleeve (1) and the threaded semi-grooves (24) on the inner sleeve (2) are combined to form a threaded circular material placement groove (241). The top of the material placement groove (241) penetrates the inner sleeve (2) inward and forms a top through hole (25). (2) A bottom through hole (26) is formed. A material blocking structure (3) is provided at both the top through hole (25) and the bottom through hole (26). Multiple auxiliary holes (11) surrounding the material placement groove (241) are provided on the outer side of the outer sleeve (1) and the inner wall of the inner sleeve (2). An inner plane part (27) is provided at the middle position of the inner wall of the inner sleeve (2). An inner platform (41) is fixedly provided on the inner plane part (27). A ventilation cavity (47) is provided at the inner ring of the inner platform (41). An air guide structure (4) is provided on the inner platform (41).

2. The activated carbon adsorption device for environmental engineering according to claim 1, characterized in that: The top of the inner sleeve (2) is integrally provided with a top threaded plug (22), and the bottom of the inner sleeve (2) is integrally provided with a bottom threaded plug (23). The top of the outer sleeve (1) forms an inward bend, and is threadedly connected to the top threaded plug (22) through the bend. A sealing ring is fitted at the bottom of the connection between the outer sleeve (1) and the inner sleeve (2).

3. The activated carbon adsorption device for environmental engineering according to claim 1, characterized in that: The top of the outer sleeve (1) has two recessed grooves (12), and each recessed groove (12) on both sides is provided with a handle (13) that can be flipped.

4. The activated carbon adsorption device for environmental engineering according to claim 1, characterized in that: The blocking structure (3) includes a fixed platform (31), which is set on the inner wall of the inner sleeve (2) and is set on one side corresponding to the top through hole (25) and the bottom through hole (26). A first sliding groove (32) is opened in the fixed platform (31) and passes through it from top to bottom. A connecting rod (33) is slidably arranged in the first sliding groove (32). An outer fitting block (34) is set at the bottom of the connecting rod (33). A blocking block (35) is set on one side of the outer fitting block (34) to block the top through hole (25) or the bottom through hole (26).

5. The activated carbon adsorption device for environmental engineering according to claim 1, characterized in that: The material placement channel (241) is threaded, forming a multi-layered annular interconnection. The auxiliary holes (11) in the single-layer material placement channel (241) are divided into multiple groups, and each group of auxiliary holes (11) consists of two holes, one of which faces upward and the other faces downward.

6. The activated carbon adsorption device for environmental engineering according to claim 5, characterized in that: The inner sleeve (2) has multiple air guide grooves (21) at the top and bottom of the inner plane part (27). The side of the air guide groove (21) facing inward forms an outward flared opening with the inner sleeve (2). Multiple sets of auxiliary holes (11) on the inner sleeve (2) are opened in the multiple air guide grooves (21).

7. The activated carbon adsorption device for environmental engineering according to claim 1, characterized in that: The air guiding structure (4) includes multiple rollers (46), which are inserted through the top of the inner platform (41). Multiple fan blades (461) are inserted into the surface of the rollers (46). An inner ring (42) is fitted into the inner ring of the inner platform (41). The bottom of the inner ring (42) is bent towards the bottom of the inner platform (41) to form a flat plate (43). A first through groove (431) is provided on the flat plate (43) corresponding to the insertion point of the rollers (46) and the inner platform (41). A coupling (45) is provided for the rollers (46) to penetrate the inner platform (41) downward.

8. The activated carbon adsorption device for environmental engineering according to claim 7, characterized in that: The inner ring (42) is provided with a plurality of motor mounting brackets (44), which are provided corresponding to the first through slot (431) and extend downward to the bottom of the coupling (45). A motor (410) connected to the coupling (45) is installed on the motor mounting bracket (44). A power gear (49) is sleeved on the bottom surface of the roller (46). A plurality of meshing auxiliary gears (411) are provided on the adjacent plate (43). The auxiliary gears (411) on both sides mesh with the power gears (49) on both sides.

9. An activated carbon adsorption device for environmental engineering according to claim 7, characterized in that: A horizontal frame (48) is provided on one side of the inner ring (42) corresponding to the ventilation cavity (47). The horizontal frame (48) is fixedly connected to the inner ring (42). A second through groove (481) is provided on both sides of the horizontal frame (48). A positioning pin (482) is slidably inserted into the second through groove (481). One end of the positioning pin (482) passes through the inner ring (42) and is inserted into the inner platform (41). The other end of the positioning pin (482) is provided with a plug. The connector (483) has sliders (485) on both sides. The crossbar (48) has a second groove (484) on the sliders (485) on both sides. The sliders (485) extend outward through the second groove (484). The crossbar (48) has a fixing block (486) on the side facing the inner circle, which is flush with the sliders (485). An elastic rope (487) is connected between the fixing block (486) and the sliders (485).

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