Circulating cooling water energy-saving variable-flow multi-stage self-balancing gravity type device of cooling tower
By adopting a multi-stage self-balancing gravity device in the cooling tower, the water flow is uniformly distributed, which solves the problem of uneven water distribution in the cooling tower, and improves the cooling efficiency and filler coverage effect.
Patent Information
- Application Number
- CN202411557322.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-01
- Publication Date
- 2025-01-07
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The existing cooling tower water system is difficult to ensure the uniform distribution of water, resulting in difficulty in sufficient coverage of fillers and reduced cooling efficiency.
The energy-saving and variable flow rate multi-stage self-balancing gravity device is adopted, including a water pipe, a water pipe, a water distribution mechanism, a balance mechanism and a swing mechanism. Through the cooperation of these components, the lateral and longitudinal balance of the water flow is achieved to ensure uniform water. Spray onto the filler.
The cooling efficiency of the cooling tower is improved, the filler is fully covered, the uniformity of the water is enhanced, and the impact of equipment balance is reduced.
Smart Images

Figure CN119268455A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of cooling tower water distribution, and in particular to a circulating cooling water energy-saving variable flow multi-stage self-balancing gravity device for a cooling tower. Background Art
[0002] A cooling tower is a tower-type heat dissipation device that cools water. Its main function is to exchange heat between the cooling water carrying waste heat and the air inside the tower, transfer the waste heat to the air and dissipate it into the atmosphere, thereby lowering the water temperature and producing recyclable cooling water. The water distribution system is an important component of a countercurrent cooling tower, and the quality of its water distribution directly affects the operating efficiency of the cooling tower.
[0003] The water distribution system of the cooling tower is an important component of the cooling tower. It is mainly responsible for distributing hot water evenly to the packing of the cooling tower to ensure that the water can fully contact the air and realize efficient heat exchange and cooling process. The operation of the water distribution system of the cooling tower is closely related to the water pressure. Moderate and stable water pressure can ensure that the hot water is evenly sprayed on the packing to achieve efficient heat exchange and cooling. When the water pressure is too high, the water flow will be unevenly rushed to multiple water distribution pipes by the higher water pressure. The water flow is easily affected by the impact force, resulting in higher water volume in some water distribution pipes and less water volume in some water distribution pipes. When the water pressure is too low, the water volume is easily affected by the balance of the equipment and flows to the water distribution pipe at the lower end, which also causes the water volume in the water distribution pipe at the higher end to become less, making it difficult to ensure the uniformity of water distribution. Uneven water distribution makes it difficult for the packing to be fully covered by water when the water is sprayed on the packing, thereby reducing the cooling efficiency of the cooling tower.
[0004] By setting up a multi-stage self-balancing gravity device, the water flow balance can be maintained during water distribution, the water pressure can be accurately controlled, the cooling water can be evenly sprayed on the filler, and the cooling efficiency of the cooling tower can be improved. Summary of the invention
[0005] The present invention proposes a circulating cooling water energy-saving variable flow multi-stage self-balancing gravity device for a cooling tower, which solves the problem in the prior art that it is difficult to ensure uniformity of water distribution. When water is sprayed onto the filler, uneven water distribution makes it difficult for the filler to be fully covered by the water flow, thereby reducing the cooling efficiency of the cooling tower.
[0006] The technical solution of the present invention is as follows: A multi-stage self-balancing gravity device for energy-saving variable flow of circulating cooling water of a cooling tower comprises: a heavy water distribution pipe, a water supply pipe, a water distribution mechanism, a balancing mechanism and a swing mechanism;
[0007] The water supply pipe is connected to a heavy water distribution pipe;
[0008] The water distribution mechanism is arranged on a heavy water distribution pipe and is used to evenly distribute water in the cooling tower;
[0009] There are two balancing mechanisms, both of which are arranged on the water distribution mechanism and are used to control the balance of the water flow laterally;
[0010] The swing mechanism is arranged on the upper water pipe and is used for longitudinally controlling the balance of the water flow.
[0011] Preferably, the water distribution mechanism comprises: a connecting pipe, a double water distribution pipe, a connecting pipe, a hose, a triple water distribution pipe, a water distribution pipe and a sprinkler head;
[0012] There are multiple connecting pipes, and the multiple connecting pipes are all connected to a heavy water distribution pipe;
[0013] Each of the connecting pipes is connected to a double water distribution pipe;
[0014] A connecting pipe is connected between each two adjacent double water distribution pipes;
[0015] Each of the double water distribution pipes is connected with a hose;
[0016] There are two triple water distribution pipes, and the two triple water distribution pipes are respectively connected between two adjacent hoses;
[0017] The two triple water distribution pipes are both connected to a plurality of water distribution pipes;
[0018] Each of the water distribution pipes is connected with a spray head.
[0019] Furthermore, the balancing mechanism comprises: a moving ring, a wedge block, a moving frame, a driving wheel, a moving assembly, a buffer assembly and a connecting assembly;
[0020] There are two movable rings, and the two movable rings are respectively slidably arranged on two double water distribution pipes;
[0021] There are two wedge-shaped blocks, and the two wedge-shaped blocks are fixedly connected to the two moving rings respectively;
[0022] The movable frame is slidably arranged on one of the connecting pipes;
[0023] There are two driving wheels, which are rotatably connected to the moving frame respectively, and the two driving wheels are in contact with two wedge blocks respectively;
[0024] The moving assembly is arranged on the connecting pipe and is used to drive the moving frame to move;
[0025] The buffer assembly is arranged on the double water distribution pipe and is used to support the moving ring;
[0026] There are two connecting assemblies, and the two connecting assemblies are respectively arranged on two moving frames.
[0027] Furthermore, the moving assembly includes: a first toothed belt, a second toothed belt, a moving gear and a driving assembly;
[0028] The first toothed belt is fixedly connected to the moving frame;
[0029] The second toothed belt is fixedly connected to the connecting pipe;
[0030] The moving gear is meshed with the first toothed belt and the second toothed belt;
[0031] The driving assembly is arranged on the connecting pipe and is used for driving the moving gear to move and rotate.
[0032] Further in the aforementioned solution, the driving assembly includes: a driving frame, a driving rod and a first electric cylinder;
[0033] The driving frame is arranged between the first toothed belt and the second toothed belt, and the moving gear is rotatably connected in the driving frame;
[0034] The driving rod is fixedly connected to the driving frame;
[0035] The first electric cylinder is arranged on the connecting pipe, and the output end of the first electric cylinder is fixedly connected to the driving rod.
[0036] In the aforementioned solution, further, the buffer assembly includes: a limiting ring and a support spring;
[0037] There are two limit rings, and the two limit rings are respectively fixedly connected to the two double water distribution pipes;
[0038] There are two support springs, and the two support springs are respectively sleeved on two double water distribution pipes.
[0039] Further in the aforementioned solution, the connection assembly includes: a rotating ring and a connecting rod;
[0040] The rotating ring is rotatably connected to the triple water distribution pipe;
[0041] The connecting rod is rotatably connected between the rotating ring and the moving ring.
[0042] In the aforementioned solution, further, the swing mechanism includes: a swing frame, a transmission frame and a power assembly;
[0043] There are two swing frames, and the two swing frames are respectively fixedly connected to two triple water distribution pipes;
[0044] The two swing frames are both fixedly connected with a transmission frame;
[0045] The power assembly is arranged on the upper water pipe.
[0046] Further in the aforementioned solution, the power assembly includes: a power frame, a slide frame and a second electric cylinder;
[0047] The power frame is slidably arranged on the upper water pipe;
[0048] There are two slides, both of which are fixedly connected to the power frame, and the two slides are respectively slidably and rotatably arranged in the two transmission frames;
[0049] There are two second electric cylinders, both of which are arranged on the upper water pipe, and the output ends of the two second electric cylinders are fixedly connected to the power frame.
[0050] In the above scheme, further, the movable frame and the rotating ring are both fixedly connected with a rotating seat, and the connecting rod is rotatably connected between the two rotating seats.
[0051] The working principle and beneficial effects of the present invention are:
[0052] 1. In the present invention, the cooperation between a water distribution pipe, a water supply pipe and a water distribution mechanism facilitates the uniform distribution of water in the cooling tower, thereby increasing the water distribution area.
[0053] 2. In the present invention, the coordination between the balancing mechanism and the swinging mechanism facilitates the control of the balance of water flow in the triple water distribution pipe, which can ensure that water is sprayed out synchronously in multiple sprinkler heads, thereby improving the uniformity of water distribution.
[0054] 3. In the present invention, through the coordination among a water distribution pipe, a water supply pipe, a water distribution mechanism, a balancing mechanism and a swinging mechanism, it is convenient to control the balance of water in the water distribution pipe, which is not easily affected by the balance of the equipment, thereby improving the uniformity of water distribution, and the filler can be fully covered by the water flow, thereby increasing the cooling efficiency of the cooling tower. BRIEF DESCRIPTION OF THE DRAWINGS
[0055] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0056] Figure 1 It is a schematic diagram of the overall structure of the present invention;
[0057] Figure 2 It is a structural schematic diagram of another angle of the present invention;
[0058] Figure 3 It is a structural schematic diagram of the balancing mechanism of the present invention;
[0059] Figure 4 For the present invention Figure 3 A schematic diagram of the partially enlarged structure at B in the middle;
[0060] Figure 5 It is a structural schematic diagram of the swing mechanism of the present invention;
[0061] Figure 6 For the present invention Figure 5 A schematic diagram of the partially enlarged structure at C in the middle;
[0062] Figure 7 For the present invention Figure 1 Schematic diagram of the partially enlarged structure at point A in the middle.
[0063] In the figure: 1. single-layer water distribution pipe; 2. upper water pipe; 3. connecting pipe; 4. double-layer water distribution pipe; 5. connecting pipe; 6. flexible pipe; 7. triple-layer water distribution pipe; 8. water distribution pipe; 9. sprinkler head; 10. movable ring; 11. wedge block; 12. movable frame; 13. driving wheel; 14. first toothed belt; 15. second toothed belt; 16. movable gear; 17. driving frame; 18. driving rod; 19. first electric cylinder; 20. limiting ring; 21. supporting spring; 22. rotating ring; 23. connecting rod; 24. swing frame; 25. transmission frame; 26. power frame; 27. slide frame; 28. second electric cylinder; 29. rotating seat. DETAILED DESCRIPTION
[0064] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0065] like Figures 1 to 7 As shown, this embodiment proposes a circulating cooling water energy-saving variable flow multi-stage self-balancing gravity device for a cooling tower, comprising: a water distribution pipe 1, an upper water pipe 2, a water distribution mechanism, a balancing mechanism and a swinging mechanism, the upper water pipe 2 is connected to the water distribution pipe 1, and through the coordination among the water distribution pipe 1, the upper water pipe 2, the water distribution mechanism, the balancing mechanism and the swinging mechanism, it is convenient to control the balance of water in the water distribution pipe, it is not easily affected by the balance of equipment, the uniformity of water distribution is improved, the filler can be fully covered by the water flow, and the cooling efficiency of the cooling tower is increased.
[0066] Among them, the water distribution mechanism is arranged on the single-layer water distribution pipe 1, which is used to evenly distribute water in the cooling tower; the water distribution mechanism includes: a connecting pipe 3, a double-layer water distribution pipe 4, a connecting pipe 5, a hose 6, a triple water distribution pipe 7, a water distribution pipe 8 and a sprinkler head 9, and a plurality of connecting pipes 3 are provided, and the plurality of connecting pipes 3 are connected to the single-layer water distribution pipe 1, and each connecting pipe 3 is connected to a double-layer water distribution pipe 4, and each adjacent two double-layer water distribution pipes 4 are connected with a connecting pipe 5, and each double-layer water distribution pipe 4 is connected with a hose 6, and the triple There are two water distribution pipes 7, and the two triple water distribution pipes 7 are respectively connected between two adjacent hoses 6. The two triple water distribution pipes 7 are connected to multiple water distribution pipes 8, and each water distribution pipe 8 is connected to a sprinkler head 9. Specifically, water is transported into the single water distribution pipe 1 through the upper water pipe 2. After the water flow is depressurized in the single water distribution pipe 1, it flows into multiple double water distribution pipes 4 at uniform hexagonal corners. The water flows into the triple water distribution pipe 7 through the double water distribution pipe 4, and the water is evenly sprayed out through the sprinkler head 9.
[0067] Among them, there are two balancing mechanisms, both of which are arranged on the water distribution mechanism, and are used to control the balance of the water flow laterally. The balancing mechanism includes: a moving ring 10, a wedge block 11, a moving frame 12, a driving wheel 13, a moving assembly, a buffer assembly and a connecting assembly. The moving frame 12 and the rotating ring 22 are fixedly connected with a rotating seat 29, and the connecting rod 23 is rotatably connected between the two rotating seats 29. There are two moving rings 10, and the two moving rings 10 are respectively slidably arranged on two double water distribution pipes 4. There are two wedge blocks 11, and the two wedge blocks 11 are respectively fixedly connected to the two moving rings 10. The moving frame 12 is slidably arranged on one of the connecting pipes 5. There are two driving wheels 13, and the two driving wheels 13 The two drive wheels 13 are respectively connected to the moving frame 12, and the two wedge blocks 11 are respectively in contact with the two wedge blocks 11. The moving assembly is arranged on the connecting pipe 5 to drive the moving frame 12 to move. The buffer assembly is arranged on the double water distribution pipe 4 to support the moving ring 10. There are two connecting assemblies, and the two connecting assemblies are respectively arranged on the two moving frames 12. The moving assembly includes: a first toothed belt 14, a second toothed belt 15, a moving gear 16 and a driving assembly. The first toothed belt 14 is fixedly connected to the moving frame 12, and the second toothed belt 15 is fixedly connected to the connecting pipe 5. The moving gear 16 is meshed with the first toothed belt 14 and the second toothed belt. The driving assembly is arranged on the connecting pipe 5 to drive the moving gear 16 to move and The drive assembly comprises: a drive frame 17, a drive rod 18 and a first electric cylinder 19. The drive frame 17 is arranged between the first toothed belt 14 and the second toothed belt. The movable gear 16 is rotatably connected in the drive frame 17. The drive rod 18 is fixedly connected to the drive frame 17. The first electric cylinder 19 is arranged on the connecting pipe 5. The output end of the first electric cylinder 19 is fixedly connected to the drive rod 18. The buffer assembly comprises: a limit ring 20 and a support spring 21. The limit ring 20 is provided with two, and the two limit rings 20 are respectively fixedly connected to the two double water distribution pipes 4. The support spring 21 is provided with two, and the two support springs 21 are respectively sleeved on the two double water distribution pipes 4. The connecting assembly comprises: a rotating ring 22 and a connecting rod 23. The rotating ring 22 is rotatably connected to On the triple water distribution pipe 7, the connecting rod 23 is rotatably connected between the rotating ring 22 and the moving ring 10. Specifically, the first electric cylinder 19 arranged on the connecting pipe 5 drives the driving rod 18 and the moving gear 16 to move between the first toothed belt 14 and the second toothed belt, thereby driving the first toothed belt 14 and the moving frame 12 to move. When the moving frame 12 moves, it drives the driving wheel 13 to support the wedge block 11, thereby driving the moving ring 10 to rise on the double water distribution pipe 4, and the moving ring 10 on the other side is lowered by the support of the support spring 21. When the moving ring 10 moves, it drives the connecting rod 23 and the rotating ring 22 to rise or fall, thereby driving the lateral angle adjustment of the triple water distribution pipe 7, thereby adjusting the height of the water flow in the water distribution pipe.
[0068] Among them, the swing mechanism is arranged on the upper water pipe 2, which is used to control the balance of the water flow longitudinally. The swing mechanism includes: a swing frame 24, a transmission frame 25 and a power assembly. There are two swing frames 24, and the two swing frames 24 are respectively fixedly connected to the two triple water distribution pipes 7. The two swing frames 24 are fixedly connected with the transmission frame 25. The power assembly is arranged on the upper water pipe 2. The power assembly includes: a power frame 26, a slide 27 and a second electric cylinder 28. The power frame 26 is slidably arranged on the upper water pipe 2. There are two slides 27, and the two slides 27 are fixed. Connected to the power frame 26, two slides 27 are respectively slidably and rotatably arranged in the two transmission frames 25, two second electric cylinders 28 are provided, and the two second electric cylinders 28 are both arranged on the upper water pipe 2, and the output ends of the two second electric cylinders 28 are fixedly connected to the power frame 26. Specifically, the power frame 26 is driven to move up and down by the second electric cylinder 28 arranged on the upper water pipe 2, and the power frame 26 slides in the swing frame 24 when moving, thereby driving the triple water distribution pipe 7 to swing in the rotating ring 22, thereby adjusting the longitudinal height of the water flow.
[0069] In this embodiment, when water is sprayed in the cooling tower, water flows through the upper water pipe 2 to transport water into the single-layer water distribution pipe 1. After the water flows through the single-layer water distribution pipe 1 to relieve pressure, the water flows into multiple double-layer water distribution pipes 4 at uniform hexagonal positions. The water flows through the double-layer water distribution pipe 4 into the triple-layer water distribution pipe 7, and the water is evenly sprayed out through the spray head 9. When the equipment is tilted, the first electric cylinder 19 is started to drive the driving rod 18 and the moving gear 16 to move between the first toothed belt 14 and the second toothed belt, thereby driving the first toothed belt 14 and the moving frame 12 to move. When the moving frame 12 moves, it drives the driving wheel 13 to support the wedge block 11, thereby The moving ring 10 is driven to rise on the double water distribution pipe 4, and the moving ring 10 on the other side is lowered by the support of the support spring 21. When the moving ring 10 moves, it drives the connecting rod 23 and the rotating ring 22 to rise or fall, thereby driving the lateral angle adjustment of the triple water distribution pipe 7, thereby adjusting the height of the water flow in the water distribution pipe. After that, the second electric cylinder 28 arranged on the upper water pipe 2 drives the power frame 26 to move up and down. When the power frame 26 moves, it slides in the swing frame 24, thereby driving the triple water distribution pipe 7 to swing in the rotating ring 22, thereby adjusting the longitudinal height of the water flow. After adjustment, it can be used normally.
[0070] The above are only preferred embodiments of the present invention and are 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 in the protection scope of the present invention.
Claims
1. The circulating cooling water energy-saving variable flow multi-stage self-balancing gravity device of the cooling tower is characterized by: include: A heavy water distribution pipe (1); An upper water pipe (2), the upper water pipe (2) being connected to the heavy water distribution pipe (1); A water distribution mechanism, the water distribution mechanism being arranged on the single water distribution pipe (1) and being used for evenly distributing water in the cooling tower; A balancing mechanism, wherein two balancing mechanisms are provided, and both balancing mechanisms are arranged on the water distribution mechanism, and are used to control the balance of the water flow laterally; A swing mechanism is arranged on the upper water pipe (2) and is used for longitudinally controlling the balance of the water flow.
2. The energy-saving variable flow multi-stage self-balancing gravity device for circulating cooling water of a cooling tower according to claim 1 is characterized in that: The water distribution mechanism comprises: A connecting pipe (3), wherein a plurality of connecting pipes (3) are provided, and the plurality of connecting pipes (3) are all connected to the one heavy water distribution pipe (1); A double water distribution pipe (4), each of the connecting pipes (3) is connected to the double water distribution pipe (4); A connecting pipe (5), wherein each adjacent two double water distribution pipes (4) are connected with the connecting pipe (5); A hose (6), each of the double water distribution pipes (4) is connected to the hose (6); A triple water distribution pipe (7), wherein two triple water distribution pipes (7) are provided, and the two triple water distribution pipes (7) are respectively connected between two adjacent hoses (6); Water distribution pipes (8), the two triple water distribution pipes (7) are connected to a plurality of water distribution pipes (8); A spray head (9), each of the water distribution pipes (8) is connected to the spray head (9).
3. The circulating cooling water energy-saving variable flow multi-stage self-balancing gravity device for a cooling tower according to claim 2 is characterized in that: The balancing mechanism comprises: A moving ring (10), wherein two moving rings (10) are provided, and the two moving rings (10) are respectively slidably arranged on the two double water distribution pipes (4); A wedge block (11), wherein two wedge blocks (11) are provided, and the two wedge blocks (11) are respectively fixedly connected to the two moving rings (10); A movable frame (12), the movable frame (12) being slidably disposed on one of the connecting pipes (5); A driving wheel (13), wherein two driving wheels (13) are provided, and the two driving wheels (13) are respectively rotatably connected to the moving frame (12), and the two driving wheels (13) are respectively in contact with the two wedge blocks (11); A moving component, the moving component is arranged on the connecting pipe (5) and is used to drive the moving frame (12) to move; A buffer assembly, the buffer assembly being arranged on the double water distribution pipe (4) and being used for supporting the moving ring (10); A connecting assembly, wherein two connecting assemblies are provided, and the two connecting assemblies are respectively arranged on two moving frames (12).
4. The circulating cooling water energy-saving variable flow multi-stage self-balancing gravity device for a cooling tower according to claim 3 is characterized in that: The mobile assembly comprises: A first toothed belt (14), wherein the first toothed belt (14) is fixedly connected to the moving frame (12); a second toothed belt (15), the second toothed belt (15) being fixedly connected to the connecting pipe (5); a moving gear (16), the moving gear (16) being meshed with the first toothed belt (14) and the second toothed belt; A driving assembly is arranged on the connecting pipe (5) and is used to drive the moving gear (16) to move and rotate.
5. The circulating cooling water energy-saving variable flow multi-stage self-balancing gravity device for a cooling tower according to claim 4, characterized in that: The drive assembly comprises: A driving frame (17), wherein the driving frame (17) is arranged between the first toothed belt (14) and the second toothed belt, and the moving gear (16) is rotatably connected in the driving frame (17); A driving rod (18), wherein the driving rod (18) is fixedly connected to the driving frame (17); A first electric cylinder (19), wherein the first electric cylinder (19) is arranged on the connecting pipe (5), and an output end of the first electric cylinder (19) is fixedly connected to the driving rod (18).
6. The energy-saving variable flow multi-stage self-balancing gravity device for circulating cooling water of a cooling tower according to claim 5, characterized in that: The buffer assembly comprises: A limiting ring (20), wherein two limiting rings (20) are provided, and the two limiting rings (20) are respectively fixedly connected to the two double water distribution pipes (4); A support spring (21), wherein two support springs (21) are provided, and the two support springs (21) are respectively sleeved on the two double water distribution pipes (4).
7. The circulating cooling water energy-saving variable flow multi-stage self-balancing gravity device for a cooling tower according to claim 6, characterized in that: The connection component comprises: A rotating ring (22), the rotating ring (22) being rotatably connected to the triple water distribution pipe (7); A connecting rod (23), wherein the connecting rod (23) is rotatably connected between the rotating ring (22) and the moving ring (10).
8. The energy-saving variable flow multi-stage self-balancing gravity device for circulating cooling water of a cooling tower according to claim 7, characterized in that: The swing mechanism comprises: A swing frame (24), wherein two swing frames (24) are provided, and the two swing frames (24) are respectively fixedly connected to the two triple water distribution pipes (7); A transmission frame (25), the two swing frames (24) are both fixedly connected to the transmission frame (25); A power assembly, wherein the power assembly is arranged on the upper water pipe (2).
9. The circulating cooling water energy-saving variable flow multi-stage self-balancing gravity device for a cooling tower according to claim 8, characterized in that: The power assembly comprises: A power frame (26), wherein the power frame (26) is slidably arranged on the upper water pipe (2); A slide (27), wherein two slides (27) are provided, and both slides (27) are fixedly connected to the power frame (26), and the two slides (27) are respectively slidably and rotatably arranged in the two transmission frames (25); A second electric cylinder (28), wherein two second electric cylinders (28) are provided, and both of the two second electric cylinders (28) are arranged on the upper water pipe (2), and the output ends of the two second electric cylinders (28) are fixedly connected to the power frame (26).
10. The energy-saving variable flow multi-stage self-balancing gravity device for circulating cooling water of a cooling tower according to claim 9, characterized in that: The movable frame (12) and the rotating ring (22) are both fixedly connected with a rotating seat (29), and the connecting rod (23) is rotatably connected between the two rotating seats (29).