Food-grade carbon dioxide efficient purification system and process thereof
By installing a copper metal mesh bag in the intake pipe and using a high-temperature reaction to generate copper oxide to consume oxygen, the problem of oxygen in the carbon dioxide mixture affecting the catalyst reaction sites is solved, the catalytic efficiency is improved, and the mesh bag replacement is automated.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHENZHEN GAOFA GASES CO LTD
- Filing Date
- 2023-08-02
- Publication Date
- 2026-04-28
AI Technical Summary
In existing technologies, the presence of oxygen in carbon dioxide mixtures reduces the number of catalyst reaction sites, thus affecting catalytic efficiency.
A copper mesh bag is installed inside the intake pipe. Copper oxide is generated through a high-temperature reaction, consuming oxygen. Combined with an automated replacement system, this ensures the effective utilization of the catalyst reaction sites.
It improves the efficiency of the catalytic process, fully utilizes the catalyst reaction sites, and enables convenient replacement of the mesh bag through an automated system.
Smart Images
Figure CN116768209B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of COS oxidation, and in particular to a food-grade carbon dioxide high-efficiency purification system and process. Background Technology
[0002] COS contained in carbon dioxide mixtures needs to be removed by oxidation. COS can be hydrolyzed under the action of a catalyst to generate hydrogen sulfide gas. Alkali metals or organic bases are commonly used as catalysts.
[0003] However, since the mixed gas often carries a small amount of oxygen, the presence of oxygen will cause the bases of the catalyst to undergo an adsorption reaction with oxygen during the reaction between COS and the catalyst. As a result, the bases are occupied by adsorption, reducing the reaction sites on the catalyst and thus reducing the catalyst activity.
[0004] During the impurity removal process, COS mixes with air, which contains a small amount of oxygen. This allows the carbon dioxide mixture to directly contact the catalyst, reducing the reaction sites on the catalyst and thus affecting the catalytic efficiency. Summary of the Invention
[0005] To address the issue of reduced reaction sites due to the reaction of COS catalyst with oxygen when in contact with a carbon dioxide mixture, this application provides a food-grade high-efficiency carbon dioxide purification system and process.
[0006] This application provides a food-grade carbon dioxide high-efficiency purification system, which adopts the following technical solution:
[0007] A food-grade carbon dioxide high-efficiency purification system, wherein an air inlet pipe is embedded in the top wall of a hydrolysis desulfurization tower, characterized in that: the air inlet pipe is provided with a temperature control section and a normal temperature section; a mesh for removing oxygen is fixed in the temperature control section of the air inlet pipe; a copper metal mesh bag is suspended below the mesh; and a heating device is provided on the pipe wall of the air inlet pipe.
[0008] By adopting the above technical solution, copper metal reacts with oxygen at high temperature to generate copper oxide, which consumes the oxygen in the COS mixed gas. When the mixed gas comes into contact with the COS catalyst, the amount of oxygen contained inside it is reduced. Therefore, most of the reaction sites of the catalyst are available during the reaction process, thereby improving the catalytic efficiency of the catalytic process.
[0009] Optionally, the opening of the mesh bag is fixedly connected to a connecting ring; a groove is provided on the inner wall of the mesh; a limiting rod is slidably arranged in the groove along the length of the mesh; and a limiting groove is provided on the outer wall of the connecting ring, which can be inserted into the limiting rod.
[0010] By adopting the above technical solution, since the copper metal inside the mesh bag needs to be replaced after a period of reaction, the mesh bag and the grid can be detachably connected by inserting the limiting rod and the connecting ring, which facilitates the replacement of copper metal during the intermittent time of COS gas introduction.
[0011] Optionally, the bottom of the grid has an annular groove that can be inserted into the connecting ring; a magnet is embedded and fixed on the top surface of the connecting ring, and a metal sheet is embedded and fixed on the top surface of the annular groove; a compression spring is fixed to the end of the limiting rod away from the connecting ring, and the end of the compression spring away from the limiting rod is fixed to the inner wall of the slide groove; a chamfer is provided at the top corner of the connecting ring that can abut against the limiting rod.
[0012] By adopting the above technical solution, the adsorption of magnets and metal sheets can facilitate the alignment of the connecting ring and the ring groove, and further automatic replacement operations can be performed after automatic completion.
[0013] Optionally, a placement box is provided below the mesh bag, and the placement box has a plurality of channels; a movable box is slidably disposed in the channels along the width direction of the placement box; the movable box has a replacement cavity for holding the replaced mesh bag and a receiving cavity for holding the replaced mesh bag.
[0014] By adopting the above technical solution, the replacement cavity is used to place the copper metal mesh bag; the receiving cavity is used to place the copper oxide mesh bag, which is the mesh bag replaced on the grid; by moving the box, the replacement cavity and the receiving cavity can alternately appear under the grid to complete the automated mesh bag replacement operation.
[0015] Optionally, an electromagnet is fixed to the inner wall of the channel, and a magnetic attracting piece that attracts the electromagnet is fixed to the side wall of the movable box; a tension spring is fixed to the inner wall of the channel away from the electromagnet, and the tension spring is fixedly connected to the movable box.
[0016] By adopting the above technical solution, the moving box can be moved closer to the electromagnet by the attraction between the electromagnet and the magnetic plate; after the electromagnet is de-energized, the tension spring can reset the moving box, thereby automating the moving operation of the moving box and making the changing cavity and the receiving cavity alternately appear below the grid.
[0017] Optionally, the bottom plate of the replacement cavity is provided with a vertically opening slide groove II, and a vertically movable pressing piece is provided in the slide groove II; a return spring I is fixed to the bottom of the pressing piece, and the bottom end of the return spring I is fixed to the bottom surface of the slide groove II; a switch moving piece is fixed to the bottom of the pressing piece, and a switch stationary piece that can make electrical contact with the switch moving piece is fixed to the bottom surface of the slide groove II; the switch moving piece is electrically connected to the electromagnet, and the switch stationary piece is electrically connected to the power supply.
[0018] By adopting the above technical solution, when the copper metal in the mesh bag reacts with oxygen to form copper oxide, the weight of the mesh bag increases; when the content of copper oxide in the mesh bag exceeds the preset threshold, the moving plate of the switch moves downward and can contact the fixed plate of the switch, thereby turning the electromagnet on and off, and completing the operation of automatically judging the proportion of copper oxide in the mesh bag.
[0019] Optionally, slide grooves three are respectively provided on both sides of slide groove two, and a transmission plate one that can slide along the width direction of the movable box is provided in slide groove three; an inclined surface one is respectively provided on the abutting surface of the pressing plate and the transmission plate one; a slide groove four is provided on the top surface of slide groove three, and a transmission plate two that can abut against the transmission plate one is slidably provided in slide groove four along the height direction of the movable box; an inclined surface two is respectively provided on the abutting surface of the transmission plate two and the transmission plate one; a return spring two is fixed on the transmission plate one, and the return spring two is used to provide the guide plate one with a spring force to return to the side closer to the pressing plate; a return spring three is fixed on the side wall of the transmission plate two, and the return spring three is used to provide the transmission plate two with a spring force to return downward.
[0020] By adopting the above technical solution, after the pressing plate is pressed down by the weight of the mesh bag, the transmission plate 2 moves upward through the transmission action. The upward movement of the transmission plate 2 can move the limiting rod, thereby disassembling the mesh bag.
[0021] Optionally, the bottom surface of the limiting rod is provided with a transmission groove that can be inserted into the top end of the second transmission plate; the contact surfaces of the second transmission plate and the transmission groove are respectively provided with inclined surfaces.
[0022] This application provides a highly efficient purification process for food-grade carbon dioxide, employing the following technical solution:
[0023] A food-grade carbon dioxide high-efficiency purification process includes the following steps: the carbon dioxide-containing raw gas is compressed and pressurized, filtered to remove solid impurities, and then heated for desulfurization; the desulfurized raw gas is hydrolyzed to form COS; then H2S and COS are catalytically oxidized sequentially, and the liquid foam is separated to obtain refined desulfurized gas.
[0024] In summary, this application includes at least one of the following beneficial technical effects:
[0025] 1. At high temperatures, copper metal reacts with oxygen to form copper oxide, which consumes the oxygen in the COS mixture. This reduces the amount of oxygen in the COS catalyst when the mixture comes into contact with it. As a result, most of the reaction sites on the catalyst are available during the reaction, thus improving the catalytic efficiency of the catalytic process.
[0026] 2. The replacement chamber is used to place the copper metal mesh bag; the receiving chamber is used to place the copper oxide mesh bag, which is the mesh bag replaced on the grid; the replacement chamber and the receiving chamber can be alternately placed under the grid by the moving box to complete the automated mesh bag replacement operation;
[0027] 3. When the copper metal inside the mesh bag reacts with oxygen to form copper oxide, the weight of the mesh bag increases. When the content of copper oxide in the mesh bag exceeds the preset threshold, the moving plate of the switch moves downward and can contact the fixed plate of the switch, thereby turning the electromagnet on and off, completing the automatic judgment of the proportion of copper oxide in the mesh bag. Attached Figure Description
[0028] Figure 1 This is a cross-sectional view of the intake pipe according to an embodiment of this application.
[0029] Figure 2 This is a schematic diagram of the structure of the placement box in an embodiment of this application.
[0030] Figure 3 This is a cross-sectional view of the mesh in an embodiment of this application.
[0031] Figure 4 This is a cross-sectional view of the mesh in an embodiment of this application.
[0032] Figure 5 This is a cross-sectional view of the intake pipe according to an embodiment of this application.
[0033] Attached reference numerals: 1. Return spring three; 11. Mesh; 12. Mesh bag; 13. Partition rod; 14. Slide groove two; 15. Pressing plate; 16. Return spring one; 17. Slide groove three; 18. Transmission plate one; 2. Air intake pipe; 21. Temperature control section; 22. Normal temperature section; 23. Slide groove four; 24. Transmission plate two; 25. Inclined surface two; 26. Guide plate two; 27. Guide groove two; 3. Heating device; 31. Inclined surface one; 32. Guide plate one; 33. Guide groove one; 34. Return spring two; 35. Support plate; 36. 37. Through hole; 38. Transmission groove; 4. Inclined surface three; 4. Hook assembly; 41. Connecting ring; 42. Limiting rod; 43. Limiting groove; 44. Slide groove one; 45. Ring groove; 46. Compression spring; 47. Chamfer; 5. Weighing assembly; 51. Placement box; 52. Channel; 53. Moving box; 54. Electromagnet; 55. Tension spring; 56. Chamber; 57. Replacement chamber; 58. Receiving chamber; 6. Storage compartment; 61. Compartment door; 62. Horizontal plate; 63. Cylinder two; 64. Cylinder three; 65. Switch plate. Detailed Implementation
[0034] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.
[0035] This application discloses a food-grade carbon dioxide high-efficiency purification system and process. (Refer to...) Figure 1 The food-grade carbon dioxide high-efficiency purification system includes a hydrolysis desulfurization tower. An inlet pipe 2 is embedded in the top wall of the hydrolysis desulfurization tower. The inlet pipe 2 is equipped with a temperature control section 21 and an ambient temperature section 22, the length of which is longer than that of the temperature control section 21. A grid 11 for removing oxygen from the mixed gas to be treated is fixed in the temperature control section 21 of the inlet pipe 2.
[0036] To remove oxygen from the gas mixture, the gas mixture is brought into contact with a high-temperature grid 11 as it passes through the intake pipe 2. A mesh bag 12 containing copper is suspended below the grid 11. Copper reacts with oxygen under heating to form copper oxide. A heating device 3, such as a heating element, is installed on the wall of the intake pipe 2 to raise the temperature near the grid 11 to 150-200°C. After passing through the grid 11, the oxygen reacts with the copper in the mesh bag 12, thereby removing the oxygen from the gas mixture.
[0037] In this embodiment, refer to Figure 2 The grid 11 has a long frame structure. Three spacers 13 are fixed along the length of the grid 11. These spacers 13 divide the grid 11 into four independent square holes. The mesh bag 12 is suspended below these square holes, and a hook assembly 4 suspends the mesh bag 12 between it and the grid 11. The hook assembly 4 includes a connecting ring 41 fixed to the edge of the mesh bag 12's opening and a limiting rod 42 slidably disposed within the grid 11 along its length. The bottom of the grid 11 has a groove 45 that can be inserted into the connecting ring 41. A magnet is embedded in the top surface of the connecting ring 41, and a metal piece is embedded in the top surface of the groove 45 to facilitate alignment when the connecting ring 41 is connected to the grid 11. A limiting groove 43 is formed on the outer wall of the connecting ring 41 that can be inserted into the limiting rod 42. After the limiting rod 42 pops out and inserts into the limiting groove 43, it provides support for the connecting ring 41. The inner wall of the grid 11 is provided with a groove 44 for accommodating the limiting rod 42.
[0038] Reference Figure 2 and Figure 3 A compression spring 46 is fixed to the end of the limiting rod 42 away from the connecting ring 41, and the end of the compression spring 46 away from the limiting rod 42 is fixedly connected to the inner wall of the slide groove 44. A chamfer 47 is provided at the top edge of the connecting ring 41, which can abut against the limiting rod 42. When the connecting ring 41 is installed, during the upward movement of the connecting ring 41, the limiting rod 42 can be pushed into the slide groove 44 by abutting against the end of the limiting rod 42.
[0039] Reference Figure 1 and Figure 2A weighing assembly 5 for replacing the mesh bag 12 is provided below the mesh 11. The weighing assembly 5 is located in the normal temperature section 22 of the air intake pipe 2. When the mesh 11 is in a high-temperature working environment, the weighing assembly 5 retracts into the pipe wall of the air intake pipe 2. The weighing assembly 5 includes a placement box 51 for holding the mesh bag 12. Several partitions are provided inside the placement box 51 to divide the space inside the placement box 51 into several strip-shaped channels 52. A movable box 53 is slidably disposed in each channel 52 along the width direction of the placement box 51. An electromagnet 54 is fixed to the inner wall of the channel 52 adjacent to the partition. A magnetic suction plate that attracts the electromagnet 54 is fixed to the side wall of the movable box 53; the movable box 53 is moved by the attraction between the electromagnet 54 and the magnetic suction plate. A tension spring 55 is fixed to the inner wall of the channel 52 away from the electromagnet 54. The tension spring 55 is connected to the movable box 53 and is used to drive the movable box 53 to reset.
[0040] Reference Figure 2 The movable box 53 has two chambers 56, which are used to hold the replaced mesh bag 12 and the unreplaced mesh bag 12, respectively. The movable box 53 moves itself to position the corresponding chamber 56 below the mesh bag 12, and then the placement box 51 moves vertically to complete the replacement of the mesh bag 12. The two chambers 56 are a replacement chamber 57 for holding the replaced mesh bag 12 and a receiving chamber 58 for holding the unreplaced mesh bag 12.
[0041] Reference Figure 1The bottom plate of the replacement cavity 57 is provided with a vertically oriented sliding groove 14, and a vertically movable pressing plate 15 is provided within the sliding groove 14. A return spring 16 is fixed to the bottom of the pressing plate 15, and the bottom end of the return spring 16 is fixedly connected to the bottom surface of the sliding groove 14. Sliding grooves 17 are respectively provided on both sides of the sliding groove 14, and a transmission plate 18 that can slide along the width direction of the movable box 53 is provided within the sliding groove 17. An inclined surface 31 is provided on the abutting surface of the pressing plate 15 and the transmission plate 18, respectively. The inclined surface 31 is provided at the bottom corner of the pressing plate 15 and the top corner of the transmission plate 18, and is used to push the transmission plate 18 away from the pressing plate 15 when the pressing plate 15 moves downward. A guide plate 32 for guiding the pressing plate 15 is fixed on the top or bottom surface of the transmission plate 18. A guide groove 33 for accommodating the guide plate 32 is formed on the top or bottom surface of the slide groove 17. A return spring 34 is fixed in the guide groove 33, and the end of the return spring 34 is fixed to the guide plate 32 to provide a spring force for the guide plate 32 to return to its original position near the pressing plate 15. A movable switch plate is fixed at the bottom of the pressing plate 15, and a fixed switch plate 65 that can make electrical contact with the movable switch plate is fixed on the bottom surface of the slide groove 14. The movable switch plate is electrically connected to the electromagnet 54, and the fixed switch plate 65 is electrically connected to the power supply. When the mesh bag 12 falls onto the pressing plate 15, the pressing plate 15 will completely overcome the elastic force provided by the return spring 16, and the electromagnet 54 will be energized. This is used to identify whether the mesh bag 12 has been disassembled. After the mesh bag 12 is disassembled, the moving box 53 needs to be moved by the electromagnet 54, so that the replacement cavity 57 moves away from below the grid 11. The replacement cavity 57 carries away the replaced mesh bag 12, which contains copper oxide. This also moves the receiving cavity 58 to below the grid 11. The receiving cavity 58 contains the mesh bag 12 to be replaced, which contains copper metal.
[0042] Reference Figure 4 The top surface of the slide groove 3 17 is provided with a slide groove 4 23. In this embodiment, the slide groove 4 23 is located at the top of the slide groove 3 17 away from the port of the slide groove 2 14. A transmission plate 24, which can abut against the transmission plate 1 18, is slidably disposed within the slide groove 4 23 along the height direction of the movable box 53. Both the transmission plate 24 and the transmission plate 18 have inclined surfaces 25 on their respective abutment surfaces; the inclined surfaces 25 are located on the top surface of the transmission plate 18 and the side of the transmission plate 24 near the pressing plate 15, respectively. A guide plate 26 for providing vertical guidance to the transmission plate 24 is fixed to the side wall of the transmission plate 24. A guide groove 27 for accommodating the guide plate 26 is provided on the inner wall of the slide groove 4 23. The slide groove 4 23 penetrates the top surface of the movable box 53. A return spring 3 1 is fixed within the guide groove 2 27. The end of the return spring 3 1 is fixedly connected to the guide plate 2 26, providing a downward restoring force for the transmission plate 2 24.
[0043] Reference Figure 4A pressure plate 35 is fixed to the top surface of the pressing plate 15, and a through hole 36 for accommodating the pressure plate 35 is opened on the bottom surface of the replacement cavity 57. During the upward movement of the moving box 53, after the pressure plate 35 contacts the mesh bag 12, it will cause the pressing plate 15 to descend against the action of the return spring 16. Since copper metal becomes heavier after oxidation into copper oxide, the spring deformation caused by the weight of the mesh bag 12 after the pressure plate 35 contacts the mesh bag 12 is determined by the amount of copper oxide. When there is a large amount of copper oxide in the mesh bag 12, the pressure plate 35 will move downward to contact the transmission plate 18 and push the transmission plate 24 to move.
[0044] Reference Figure 4 The bottom surface of the limiting rod 42 has a transmission groove 37 that can be inserted into the top of the transmission plate 24. The top of the transmission plate 24 and the side wall of the transmission groove 37 away from the connecting ring 41 have a contact surface. The contact surfaces of the transmission plate 24 and the transmission groove 37 are respectively provided with inclined surfaces 38. When the transmission plate 24 moves upward, it can be pushed away from the connecting ring 41 by the inclined surfaces 38, thus separating the transmission plate 24 from the connecting ring 41.
[0045] Reference Figure 5 When filtering oxygen using grid 11, a high-temperature environment is required within the pipeline, so the placement box 51 is housed within the pipe wall of the ambient temperature section 22. A storage compartment 6 for accommodating the placement box 51 is provided on the pipe wall of the ambient temperature section 22. A door 61 is vertically slidable at the opening of the storage compartment 6 to separate it from the external environment. A horizontal plate 62 is vertically slidable inside the storage compartment 6, and a second cylinder 63 is fixedly mounted on the horizontal plate 62. The hydraulic rod of the second cylinder 63 is fixedly connected to the placement box 51, driving it to move horizontally. A third cylinder 64 is also provided inside the storage compartment 6, and its hydraulic rod is fixedly connected to the bottom surface of the horizontal plate 62, driving the horizontal plate 62 and the placement box 51 to move vertically.
[0046] A highly efficient purification process for food-grade carbon dioxide includes the following steps:
[0047] S1. The carbon dioxide-containing raw gas is compressed and boosted by the compressor, then enters the filter tube to remove solid impurities, and is then sent to the desulfurization heater for desulfurization; the raw gas is then fed into the hydrolysis desulfurization tower to hydrolyze COS to obtain hydrolyzed raw gas.
[0048] S2. The hydrolyzed raw gas is fed into the fine desulfurization tower for catalytic oxidation of H2S, then COS catalytic oxidation is carried out through the COS catalytic oxidation layer, and finally the liquid mist is separated by the liquid mist separator to obtain fine desulfurized gas.
[0049] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A food-grade carbon dioxide high-efficiency purification system, wherein an inlet pipe (2) is embedded in the top wall of a hydrolysis desulfurization tower, characterized in that: The intake pipe (2) is provided with a temperature control section (21) and a normal temperature section (22). A mesh (11) is fixedly installed in the temperature control section (21) of the intake pipe (2). A copper metal mesh bag (12) is suspended below the mesh (11). A heating device (3) is installed on the pipe wall of the intake pipe (2). A groove (44) is provided on the inner wall of the grid (11); a limit rod (42) is slidably provided in the groove (44) of the grid (11) along the length direction of the grid (11). A placement box (51) is provided below the mesh bag (12), and a plurality of channels (52) are provided inside the placement box (51); a movable box (53) is slidably arranged inside the channels (52) along the width direction of the placement box (51); the movable box (53) is provided with a replacement cavity (57) for holding the replaced mesh bag (12) and a receiving cavity (58) for holding the replaced mesh bag (12); An electromagnet (54) is fixed to the inner wall of the channel (52), and a magnetic suction piece that attracts the electromagnet (54) is fixed to the side wall of the movable box (53); a tension spring (55) is fixed to the inner wall of the channel (52) away from the electromagnet (54), and the tension spring (55) is fixed to the movable box (53). The bottom plate of the displacement cavity (57) is provided with a vertically opened slide groove two (14), and a vertically movable pressing piece (15) is provided in the slide groove two (14); a return spring one (16) is fixed at the bottom of the pressing piece (15), and the bottom end of the return spring one (16) is fixed to the bottom surface of the slide groove two (14); a switch moving piece is fixed at the bottom of the pressing piece (15), and a switch fixed piece (65) that can make electrical contact with the switch moving piece is fixed at the bottom surface of the slide groove two (14); the switch moving piece is electrically connected to the electromagnet (54), and the switch fixed piece (65) is electrically connected to the power supply; Slide groove 3 (17) is provided on both sides of slide groove 2 (14). A transmission plate 1 (18) that can slide along the width direction of the movable box (53) is provided in slide groove 3 (17). Inclined surface 1 (31) is provided on the contact surface of the pressing plate (15) and the transmission plate 1 (18). Slide groove 4 (23) is provided on the top surface of slide groove 3 (17). A transmission plate 2 that can abut against the transmission plate 1 (18) is provided in slide groove 4 (23) along the height direction of the movable box (53). (24); The second transmission plate (24) and the first transmission plate (18) are respectively provided with a inclined surface (25) on their abutting surfaces; a second return spring (34) is fixed on the first transmission plate (18), and the second return spring (34) is used to provide the first transmission plate (18) with a spring force to return to the side closer to the pressing plate (15); a third return spring (1) is fixed on the side wall of the second transmission plate (24), and the third return spring (1) is used to provide the second transmission plate (24) with a spring force to return downward; The bottom surface of the limiting rod (42) is provided with a transmission groove (37) that can be inserted into the top of the transmission plate two (24); the contact surfaces of the transmission plate two (24) and the transmission groove (37) are respectively provided with inclined surfaces three (38).
2. The food-grade carbon dioxide high-efficiency purification system according to claim 1, characterized in that: The opening of the mesh bag (12) is fixed with a connecting ring (41); the outer wall of the connecting ring (41) is provided with a limiting groove (43) that can be inserted into the limiting rod (42).
3. The food-grade carbon dioxide high-efficiency purification system according to claim 2, characterized in that: The bottom of the grid (11) is provided with an annular groove (45) that can be inserted into the connecting ring (41); a magnet is embedded and fixed on the top surface of the connecting ring (41), and a metal sheet is embedded and fixed on the top surface of the annular groove (45); a compression spring (46) is fixed on the end of the limiting rod (42) away from the connecting ring (41), and the end of the compression spring (46) away from the limiting rod (42) is fixed to the inner wall of the slide groove (44); a chamfer (47) is provided at the top corner of the connecting ring (41) that can abut against the limiting rod (42).
Citation Information
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