Cryogenic processing apparatus for liquefying natural gas

Abstract

The application discloses a low-temperature treatment device for liquefying natural gas and relates to the technical field of natural gas processing. The low-temperature treatment device is provided with a rotating flow pipe, a driving assembly, a communication seat, a rotating stirring plate and a rotating spoiler. When the driving assembly works, the first transmission gear controls the second transmission gear and the rotating flow pipe to rotate. At this time, the natural gas flowing through the rotating flow pipe can be in contact with the liquid nitrogen at multiple positions in the low-temperature treatment box. The rotating flow pipe drives the rotating stirring plate to rotate at the same time. When the connecting gear rotates, the connecting gear is in engagement with the supporting gear ring, so that the rotating spoiler can be controlled to rotate. When the rotating spoiler and the rotating stirring plate rotate, the liquid nitrogen in the low-temperature treatment box is stirred, the liquid nitrogen in the low-temperature treatment box flows better, the situation that the temperature difference of the liquid nitrogen at different positions is large is avoided, the low temperature of the liquid nitrogen can fully and efficiently realize the cooling treatment of the natural gas, and the cooling treatment effect and efficiency of the natural gas are better.

Description

Technical Field

[0001] This invention relates to the field of natural gas processing technology, and more specifically, to a cryogenic processing apparatus for natural gas liquefaction. Background Technology

[0002] Natural gas liquefaction is a necessary step in natural gas processing and storage. Some natural gas liquefaction processes involve passing it through a liquid nitrogen container, utilizing heat exchange with the liquid nitrogen to cool the natural gas. However, in fixed natural gas flow patterns, the heat of the liquid nitrogen near the natural gas flow path may be significantly consumed, while there is a significant temperature difference between the liquid nitrogen far from the natural gas flow path and the liquid nitrogen close to the natural gas in the container. Furthermore, the flow between the liquid nitrogen and the natural gas takes a certain amount of time, resulting in poor utilization of the liquid nitrogen and insufficient efficiency in reducing the temperature of the natural gas. Therefore, a cryogenic processing device for natural gas liquefaction is needed to solve the above problems. Summary of the Invention

[0003] To overcome the above-mentioned defects, the present invention provides a cryogenic processing device for natural gas liquefaction. The technical problem to be solved by the present invention is that during natural gas liquefaction, the contact part with liquid nitrogen causes a significant temperature difference between the surrounding liquid nitrogen and the liquid nitrogen far away from the natural gas, resulting in poor utilization of liquid nitrogen and insufficient cooling efficiency of natural gas.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a cryogenic treatment device for natural gas liquefaction, comprising an insulated treatment box and a cryogenic treatment chamber, wherein a fixed column is connected inside the insulated treatment box, the top end of the fixed column is connected to the cryogenic treatment chamber, a rotary conduction device is connected through the outside of the cryogenic treatment chamber, the rotary conduction device is connected through the bottom of the insulated treatment box, a natural gas heat-conducting connecting pipe is connected to the rotary conduction device, a natural gas injection pipe is connected to the top end of the natural gas heat-conducting connecting pipe, a spiral connecting pipe is wound around the natural gas heat-conducting connecting pipe, the spiral connecting pipe is connected to the cryogenic treatment chamber, a nitrogen injection pipe is connected to the bottom of the cryogenic treatment chamber, a rotary drive device is connected outside the rotary conduction device, the rotary drive device is connected inside the insulated treatment box, a rotary disturbance device is connected outside the rotary conduction device, a support gear ring is engaged outside the rotary disturbance device, the support gear ring is connected inside the cryogenic treatment chamber.

[0005] As a further embodiment of the present invention: the other end of the spiral connecting pipe is connected to a nitrogen exhaust pipe, the nitrogen exhaust pipe is fitted with a fourth sealing connecting sleeve, the fourth sealing connecting sleeve is connected through the heat preservation box, the nitrogen injection pipe is fitted with a third sealing connecting sleeve, the third sealing connecting sleeve is connected through the bottom of the heat preservation box, and the bottom end of the nitrogen injection pipe is located outside the heat preservation box.

[0006] As a further aspect of the present invention: the natural gas injection pipe is fitted with a first sealing connection sleeve, the top end of the natural gas injection pipe is located outside the insulation treatment box, the first sealing connection sleeve is connected through the insulation treatment box, and a support leg is connected to the bottom of the insulation treatment box.

[0007] As a further embodiment of the present invention: the rotary conduction device includes a rotary flow tube, both ends of which are connected to a connecting seat. A first support bearing is sleeved on the connecting seat. The first support bearing is connected through to the outside of the low-temperature treatment chamber. The rotary disturbance device is connected to the outside of the rotary flow tube.

[0008] As a further embodiment of the present invention: the other end of the connecting seat is connected to a rotating connector, the rotating drive device is connected to the outside of the upper connecting seat, and two extension rods are connected to the outside of the lower connecting seat. A rotating agitator is connected to the side of the extension rods near the rotating flow tube.

[0009] As a further embodiment of the present invention: the rotating flow pipe is configured as a serpentine shape, the rotating flow pipe is located inside the low-temperature treatment chamber, the natural gas heat-conducting connection pipe is connected to the upper rotating connection head, the lower rotating connection head is connected to a natural gas discharge pipe, the natural gas discharge pipe is fitted with a second sealing connection sleeve, and the second sealing connection sleeve is connected through the lower part of the low-temperature treatment chamber.

[0010] As a further aspect of the present invention: the rotary drive device includes a drive assembly, the output shaft of the drive assembly is connected to a first transmission gear, the drive assembly is externally connected to a transverse fixed connecting rod, and the other end of the transverse fixed connecting rod is connected to the inner wall of the heat preservation box.

[0011] As a further aspect of the present invention: the first transmission gear is externally meshed with a second transmission gear, the second transmission gear is connected to the outside of the rotary transmission device, and the connection between the second transmission gear and the rotary transmission device is located at the axial position of the second transmission gear.

[0012] As a further embodiment of the present invention: the rotating disturbance device includes a rotating connecting shaft, a rotating spoiler is externally connected to the rotating connecting shaft, a second support bearing is sleeved on the rotating connecting shaft, and the rotating spoiler is located on the lower side of the second support bearing.

[0013] As a further aspect of the present invention: a fixing rod is externally connected to the second support bearing, the other end of the fixing rod is connected to a rotation transmission device, and a connecting gear is connected to the top end of the rotation connecting shaft, the connecting gear meshing with the support gear ring.

[0014] The beneficial effects of this invention are as follows: 1. This invention, by setting up a rotating flow pipe, a driving component, a first transmission gear, a second transmission gear, a connecting seat, a rotating connector, a rotating agitator, and a rotating baffle, allows the driving component to control the rotation of the second transmission gear and the rotating flow pipe through the first transmission gear when it is working. At this time, the natural gas flowing through the rotating flow pipe can come into more comprehensive contact with the liquid nitrogen in multiple locations within the cryogenic treatment chamber. The rotation of the rotating flow pipe drives the rotating agitator to rotate, and the connecting gear meshes with the supporting gear ring when it rotates, thus controlling the rotation of the rotating baffle. The rotation of the rotating baffle and the rotating agitator agitates the liquid nitrogen in the cryogenic treatment chamber, resulting in better liquid nitrogen flow within the chamber and avoiding large temperature differences in different parts of the liquid nitrogen. The low temperature of the liquid nitrogen can fully and efficiently cool the natural gas, resulting in better cooling effect and efficiency.

[0015] 2. This invention, by setting up a spiral connecting pipe, a nitrogen exhaust pipe, a natural gas heat-conducting connecting pipe, and an insulation treatment box, allows nitrogen to flow from bottom to top within the low-temperature treatment box. After cooling the natural gas, the nitrogen flows into the spiral connecting pipe, which covers the natural gas heat-conducting connecting pipe. At this point, the heated liquid nitrogen provides initial cooling to the natural gas in the heat-conducting connecting pipe. Simultaneously, the heat in the spiral connecting pipe exchanges with the heat in the insulation treatment box, maintaining a lower temperature inside the box, resulting in better insulation and reduced energy consumption. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0017] Figure 2 This is a three-dimensional structural diagram of the present invention viewed from below.

[0018] Figure 3 This is a three-dimensional cross-sectional structural diagram of the present invention.

[0019] Figure 4 This is a three-dimensional cross-sectional structural diagram of the low-temperature treatment chamber of the present invention.

[0020] Figure 5 This is a three-dimensional cross-sectional view of the cryogenic treatment chamber of the present invention, viewed from below.

[0021] Figure 6 This is a schematic diagram of the three-dimensional structure of the supporting gear ring of the present invention.

[0022] Figure 7 This is a three-dimensional structural schematic diagram of the rotary transmission device of the present invention.

[0023] Figure 8 This is a three-dimensional structural schematic diagram of the rotating disturbance device of the present invention.

[0024] In the diagram: 1. Insulation box; 2. Support leg; 3. Fixed column; 4. Low-temperature treatment box; 5. Spiral connecting pipe; 6. Nitrogen exhaust pipe; 7. Natural gas heat conduction connecting pipe; 8. Natural gas injection pipe; 9. First sealing connecting sleeve; 10. Rotary conduction device; 101. Rotary flow pipe; 102. Connecting seat; 103. First support bearing; 104. Rotary connector; 105. Natural gas exhaust pipe; 106. Second sealing connecting sleeve; 107. Extension rod; 08. Rotating agitator plate; 11. Rotating drive device; 111. Drive assembly; 112. First transmission gear; 113. Lateral fixed connecting rod; 114. Second transmission gear; 12. Rotating disturbance device; 121. Rotating connecting shaft; 122. Rotating spoiler plate; 123. Second support bearing; 124. Fixed rod; 125. Connecting gear; 13. Support gear ring; 14. Nitrogen injection pipe; 15. Third sealing connecting sleeve; 16. Fourth sealing connecting sleeve. Detailed Implementation

[0025] 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.

[0026] like Figure 1-8 As shown, the present invention provides a cryogenic treatment device for natural gas liquefaction, including an insulated treatment box 1 and a cryogenic treatment box 4. A fixed column 3 is connected inside the insulated treatment box 1, and the top of the fixed column 3 is connected to the cryogenic treatment box 4. A rotary conduction device 10 is connected through the outside of the cryogenic treatment box 4 and is connected through the bottom of the insulated treatment box 1. By setting up the insulated treatment box 1, the insulated treatment box 1 separates the heat inside and outside, realizes the heat preservation effect inside, and reduces the rate of loss of the internal low temperature environment.

[0027] A natural gas heat-conducting connecting pipe 7 is connected to the rotary conduction device 10. A natural gas injection pipe 8 is connected to the top of the natural gas heat-conducting connecting pipe 7. A spiral connecting pipe 5 is wound around the outside of the natural gas heat-conducting connecting pipe 7. The spiral connecting pipe 5 is connected to the cryogenic treatment box 4. By setting the spiral connecting pipe 5 and the natural gas injection pipe 8, the liquid nitrogen flowing in the spiral connecting pipe 5 can maintain sufficient contact with the natural gas injection pipe 8, realizing heat exchange between the liquid nitrogen in the spiral connecting pipe 5 and the natural gas in the natural gas injection pipe 8, and achieving preliminary cooling of the natural gas.

[0028] The cryogenic treatment chamber 4 is connected to a nitrogen injection pipe 14. A rotary drive device 11 is connected to the outside of the rotary conduction device 10. The rotary drive device 11 is connected inside the cryogenic treatment chamber 1. A rotary disturbance device 12 is connected to the outside of the rotary conduction device 10. A support gear ring 13 is engaged with the outside of the rotary disturbance device 12. The support gear ring 13 is connected inside the cryogenic treatment chamber 4. By setting up the nitrogen injection pipe 14 and the nitrogen discharge pipe 6, the nitrogen injection pipe 14 can continuously inject low-temperature liquid nitrogen into the cryogenic treatment chamber 4. The nitrogen discharge pipe 6 is used to discharge the liquid nitrogen after the temperature rises out of the cryogenic treatment chamber 4.

[0029] The other end of the spiral connecting pipe 5 is connected to a nitrogen exhaust pipe 6. The nitrogen exhaust pipe 6 is covered with a fourth sealing connecting sleeve 16, which is connected through the insulation treatment box 1. The nitrogen injection pipe 14 is covered with a third sealing connecting sleeve 15, which is connected through the bottom of the insulation treatment box 1. The bottom end of the nitrogen injection pipe 14 is located outside the insulation treatment box 1. By setting the third sealing connecting sleeve 15 and the fourth sealing connecting sleeve 16, the sealing effect between the nitrogen injection pipe 14, the nitrogen exhaust pipe 6 and the insulation treatment box 1 is ensured.

[0030] The natural gas injection pipe 8 is covered with a first sealing connection sleeve 9. The top end of the natural gas injection pipe 8 is located outside the heat preservation box 1. The first sealing connection sleeve 9 is connected through the heat preservation box 1. The heat preservation box 1 is connected to a support leg 2.

[0031] The rotary conduction device 10 includes a rotary flow pipe 101, with connecting seats 102 at both ends. A first support bearing 103 is sleeved on the connecting seat 102 and extends through the outside of the cryogenic treatment chamber 4. A rotary disturbance device 12 is connected to the outside of the rotary flow pipe 101. By setting the rotary flow pipe 101, the serpentine arrangement of the rotary flow pipe 101 ensures the flow path of natural gas in the cryogenic treatment chamber 4, allowing natural gas to exchange heat with liquid nitrogen more fully. The first support bearing 103 supports the connecting seat 102, ensuring that the connecting seat 102 and the rotary flow pipe 101 can rotate smoothly.

[0032] The other end of the connecting seat 102 is connected to a rotary connector 104. The rotary drive device 11 is connected to the outside of the upper connecting seat 102. Two extension rods 107 are connected to the outside of the lower connecting seat 102. A rotary agitator 108 is connected to the side of the extension rods 107 near the rotary flow pipe 101. By setting the rotary connector 104, the rotary connector 104 can maintain the connection between the rotating rotary flow pipe 101 and the natural gas injection pipe 8 and the natural gas heat conduction connection pipe 7, so that the natural gas can flow smoothly into the rotating rotary flow pipe 101. By setting the extension rods 107 and the rotary agitator 108, the rotary flow pipe 101 controls the rotation of the rotary agitator 108 through the extension rods 107. The rotary agitator 108 realizes the agitation of liquid nitrogen in the cryogenic treatment box 4.

[0033] The rotating flow pipe 101 is designed in a serpentine shape and is located inside the cryogenic treatment chamber 4. The natural gas heat-conducting connection pipe 7 is connected to the upper rotating connector 104, and the lower rotating connector 104 is connected to the natural gas discharge pipe 105. The natural gas discharge pipe 105 is covered with a second sealing connection sleeve 106, which is connected through the lower part of the cryogenic treatment chamber 4. By setting the second sealing connection sleeve 106, the sealing effect between the natural gas discharge pipe 105 and the cryogenic treatment chamber 4 is better.

[0034] The rotary drive device 11 includes a drive assembly 111. The output shaft of the drive assembly 111 is connected to a first transmission gear 112. A transverse fixed connecting rod 113 is externally connected to the drive assembly 111. The other end of the transverse fixed connecting rod 113 is connected to the inner wall of the heat preservation box 1.

[0035] The first transmission gear 112 is externally meshed with the second transmission gear 114. The second transmission gear 114 is connected to the outside of the rotary transmission device 10. The connection between the second transmission gear 114 and the rotary transmission device 10 is located at the axial center of the second transmission gear 114. By setting the drive assembly 111 and the first transmission gear 112, the drive assembly 111 is used to control the rotation of the first transmission gear 112. By setting the second transmission gear 114 and the first transmission gear 112, the first transmission gear 112 can control the rotation of the second transmission gear 114, thereby achieving stable rotation control of the second transmission gear 114 and the rotary flow pipe 101. By setting the transverse fixed connecting rod 113, the transverse fixed connecting rod 113 supports the drive assembly 111, ensuring the stability of the drive assembly 111 during operation.

[0036] The rotating disturbance device 12 includes a rotating connecting shaft 121, a rotating spoiler 122 connected to the outside of the rotating connecting shaft 121, and a second support bearing 123 sleeved on the rotating connecting shaft 121. The rotating spoiler 122 is located below the second support bearing 123. By setting the second support bearing 123, the second support bearing 123 supports the rotating connecting shaft 121 and the connecting gear 125, ensuring that the rotating connecting shaft 121 and the connecting gear 125 can rotate smoothly and stably, and that the connecting gear 125 maintains stable meshing with the support gear ring 13.

[0037] The second support bearing 123 is externally connected to a fixed rod 124. The other end of the fixed rod 124 is connected to the rotary transmission device 10. The top end of the rotary connecting shaft 121 is connected to a connecting gear 125. The connecting gear 125 meshes with the support gear ring 13. By setting a rotary baffle 122, when the rotary baffle 122 rotates, it can agitate the liquid nitrogen in the cryogenic treatment box 4 over a relatively large range as it rotates with the rotary flow pipe 101. By setting a connecting gear 125 and a support gear ring 13, when the connecting gear 125 is driven to rotate by the rotary flow pipe 101, the meshing between the support gear ring 13 and the connecting gear 125 can control the rotation of the connecting gear 125 and the rotary connecting shaft 121.

[0038] Working principle of this invention: When natural gas needs to be cryogenically treated, liquid nitrogen is directly introduced into the cryogenic treatment chamber 4 through the nitrogen injection pipe 14, and natural gas is injected into the natural gas heat-conducting connecting pipe 7 and the rotating flow pipe 101 through the natural gas injection pipe 8. Simultaneously, the drive assembly 111 is controlled to operate. When the drive assembly 111 operates, it drives the first transmission gear 112 to rotate. The first transmission gear 112 controls the rotation of the second transmission gear 114, the connecting seat 102, and the rotating flow pipe 101. The rotation of the rotating flow pipe 101 simultaneously drives the rotating agitator plate 108 to rotate. At this time, the natural gas flowing through the rotating flow pipe 101 can come into relatively comprehensive contact with the liquid nitrogen at multiple locations within the cryogenic treatment chamber 4. Simultaneously, the rotation of the rotating flow pipe 101 controls the rotation of the second support bearing 123 and the rotating connecting shaft 121 via the fixed rod 124. While the connecting shaft 121 rotates, it drives the connecting gear 125 to move. When the connecting gear 125 rotates, it maintains meshing with the support gear ring 13. At this time, the support gear ring 13 can control the rotation of the connecting gear 125, the rotating connecting shaft 121, and the rotating baffle 122. When the rotating baffle 122 and the rotating stirring plate 108 rotate, they agitate the liquid nitrogen in the cryogenic treatment tank 4, so that the liquid nitrogen flows fully and contacts the rotating flow pipe 101. The liquid nitrogen flowing upward in the cryogenic treatment tank 4 enters the spiral connecting pipe 5, realizing the initial cooling of the natural gas in the natural gas heat-conducting connecting pipe 7. The natural gas flowing downward in the rotating flow pipe 101 contacts the liquid nitrogen that initially entered the cryogenic treatment tank 4, completing the cooling process. Then, the cooled natural gas is discharged through the natural gas discharge pipe 105, and then the drive assembly 111 can be stopped.

[0039] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can refer to mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc., are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0040] Secondly: The accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other.

[0041] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. 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. A cryogenic processing device for natural gas liquefaction, comprising an insulated processing tank (1) and a cryogenic processing tank (4), characterized in that: The heat preservation box (1) is connected to a fixed column (3), the top of the fixed column (3) is connected to the low temperature treatment box (4), the low temperature treatment box (4) is connected to a rotating conduction device (10) through the outside, the rotating conduction device (10) is connected to the bottom of the heat preservation box (1), the rotating conduction device (10) is connected to a natural gas heat conduction connection pipe (7), and the top of the natural gas heat conduction connection pipe (7) is connected to a natural gas injection pipe (8). The natural gas heat-conducting connecting pipe (7) is wrapped with a spiral connecting pipe (5), which is connected to the low-temperature treatment box (4). The low-temperature treatment box (4) is connected to a nitrogen injection pipe (14). The rotary conduction device (10) is connected to a rotary drive device (11), which is connected inside the heat preservation treatment box (1). The rotary conduction device (10) is connected to a rotary disturbance device (12), which is engaged with a support gear ring (13), which is connected inside the low-temperature treatment box (4).

2. The cryogenic processing apparatus for natural gas liquefaction according to claim 1, characterized in that: The other end of the spiral connecting pipe (5) is connected to a nitrogen exhaust pipe (6). The nitrogen exhaust pipe (6) is covered with a fourth sealing connecting sleeve (16). The fourth sealing connecting sleeve (16) is connected through the heat preservation treatment box (1). The nitrogen injection pipe (14) is covered with a third sealing connecting sleeve (15). The third sealing connecting sleeve (15) is connected through the bottom of the heat preservation treatment box (1). The bottom end of the nitrogen injection pipe (14) is located outside the heat preservation treatment box (1).

3. A cryogenic processing apparatus for natural gas liquefaction according to claim 1, characterized in that: The natural gas injection pipe (8) is covered with a first sealing connection sleeve (9). The top end of the natural gas injection pipe (8) is located outside the heat preservation box (1). The first sealing connection sleeve (9) is connected through the heat preservation box (1). The heat preservation box (1) is connected to a support leg (2).

4. A cryogenic processing apparatus for natural gas liquefaction according to claim 1, characterized in that: The rotary transmission device (10) includes a rotary flow pipe (101), both ends of which are connected to a connecting seat (102). The connecting seat (102) is fitted with a first support bearing (103), which is connected through to the outside of the low temperature treatment box (4). The rotary disturbance device (12) is connected to the outside of the rotary flow pipe (101).

5. A cryogenic processing apparatus for natural gas liquefaction according to claim 4, characterized in that: The other end of the connecting seat (102) is connected to a rotary connector (104). The rotary drive device (11) is connected to the outside of the upper connecting seat (102). Two extension rods (107) are connected to the outside of the lower connecting seat (102). A rotary stirring plate (108) is connected to the outside of the extension rods (107) near the rotary flow pipe (101).

6. A cryogenic processing apparatus for natural gas liquefaction according to claim 5, characterized in that: The rotating flow pipe (101) is serpentine and located inside the low-temperature treatment box (4). The natural gas heat-conducting connection pipe (7) is connected to the upper rotating connector (104), and the lower rotating connector (104) is connected to a natural gas discharge pipe (105). The natural gas discharge pipe (105) is covered with a second sealing connection sleeve (106), which is connected through the lower part of the low-temperature treatment box (4).

7. A cryogenic processing apparatus for natural gas liquefaction according to claim 1, characterized in that: The rotary drive device (11) includes a drive assembly (111), the output shaft of which is connected to a first transmission gear (112), and a transverse fixed connecting rod (113) is externally connected to the drive assembly (111), the other end of which is connected to the inner wall of the heat preservation box (1).

8. A cryogenic processing apparatus for natural gas liquefaction according to claim 7, characterized in that: The first transmission gear (112) is externally meshed with the second transmission gear (114), the second transmission gear (114) is connected to the outside of the rotary transmission device (10), and the connection between the second transmission gear (114) and the rotary transmission device (10) is located at the axial position of the second transmission gear (114).

9. A cryogenic processing apparatus for natural gas liquefaction according to claim 1, characterized in that: The rotating disturbance device (12) includes a rotating connecting shaft (121), a rotating spoiler (122) is externally connected to the rotating connecting shaft (121), a second support bearing (123) is sleeved on the rotating connecting shaft (121), and the rotating spoiler (122) is located on the lower side of the second support bearing (123).

10. A cryogenic processing apparatus for natural gas liquefaction according to claim 9, characterized in that: The second support bearing (123) is externally connected to a fixing rod (124), the other end of which is connected to a rotary transmission device (10). The top end of the rotary connecting shaft (121) is connected to a connecting gear (125), which meshes with the support gear ring (13).

Images