A special tube bundle extraction and installation device for heat exchangers

Abstract

This utility model relates to the field of heat exchanger maintenance and installation technology, and discloses a special tube bundle extraction and installation device for heat exchangers. It includes a support frame, a fixed frame on top of the support frame, first slide rails fixed on both sides of the frame, and a third slide rail fixed on top of the frame. A sliding frame is slidably connected inside the track grooves of the first and third slide rails. A tube bundle body is mounted on top of the support frame. The tube bundle body can be rotated using a rotating roller, and a swing cylinder drives a limiting frame to rotate, thereby adjusting the height of the tube bundle body. This allows for flexible adjustment based on the diameter and height of the heat exchanger tube bundle body, achieving radial alignment between the tube bundle body and the cylinder. This effectively avoids installation difficulties and poor sealing caused by inaccurate alignment, ensuring the installation quality of the heat exchanger. The adjustment mechanism can adjust the support height, adapting to heat exchanger tube bundle bodies of different diameters and heights. One set of equipment can meet the installation needs of tube bundle bodies of various specifications.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger maintenance and installation technology, specifically a special tube bundle extraction and installation device for heat exchangers. Background Technology

[0002] Heat exchangers are essential equipment widely used in the petrochemical industry. Due to the need for regular maintenance, they require repeated on-site installation and removal. However, due to the challenges of long lengths, heavy weights, and high-altitude operations during heat exchanger tube bundle construction, heat exchangers typically consist of a shell and a tube bundle body located within the shell. The tube bundle body is the core component of the heat exchanger for heat transfer.

[0003] During the extraction and installation of heat exchanger tube bundles, the diameter and height of the internal tube bundles vary significantly depending on the model and application of the heat exchanger. Existing tube bundle extraction and installation equipment often lacks sufficient design flexibility, making it difficult to precisely adjust to the actual dimensions of the tube bundles. In practice, when radially aligning the tube bundles with the shell, inaccurate alignment often occurs due to the inability to flexibly match the diameter and height of the tube bundles. Different specifications of tube bundles typically require corresponding extraction and installation equipment, necessitating significant investment in multiple devices and increasing equipment costs. Furthermore, the equipment's versatility and utilization are severely limited. Therefore, a dedicated tube bundle extraction and installation device for heat exchangers is proposed. Utility Model Content

[0004] The purpose of this invention is to provide a special tube bundle extraction and installation device for heat exchangers to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a tube bundle extraction and installation device for heat exchangers, comprising a support frame, a frame fixed to the top of the support frame, first slide rails fixed to both sides of the frame, and a third slide rail fixed to the top of the frame;

[0006] The first and third slide rails are slidably connected to the inner sides of their track grooves by sliding frames;

[0007] The top of the support frame is provided with a tube bundle body, and a number of baffles are connected to the outside of the tube bundle body. One end of the tube bundle body is provided with a tube plate, and a lifting lug is fixed to the outside of the tube plate.

[0008] The sliding frame is provided with a receiving mechanism and an adjusting mechanism on one side for adjusting the height of the tube bundle body;

[0009] A power assembly is provided on one side of the sliding frame, and a push assembly is provided on the upper side of the power assembly;

[0010] Limit plates are fixed on both sides of the sliding frame, and a pull rope is connected between the limit plate and the lifting lug. A fixing plate is bolted to one end of the frame.

[0011] Preferably, the frame is fixed with limiting blocks at both ends of the third slide rail, the support frame has a cylinder on one side of the heat exchanger, and a flange is provided at one end of the cylinder.

[0012] Preferably, the above-mentioned receiving mechanism includes a base plate, a first hydraulic cylinder is fixed to the top of the base plate, a connecting plate is fixed to the push rod end of the first hydraulic cylinder, a side plate is fixed to the top of the connecting plate, and a load-bearing plate located on the lower side of the tube bundle body is fixed to the top of the side plate.

[0013] Preferably, the adjustment mechanism includes several bases, with a fixed frame fixed to the top of each base, and a limit frame rotatably connected to the inner side of the fixed frame, the limit frame being a triangular frame.

[0014] Preferably, the limiting frame has two rotating rollers rotatably connected to its outer side, the rotating rollers are tumbled to the outer side of the tube bundle body, and a swing cylinder is fixed to one side of the fixing frame, the output shaft end of the swing cylinder being fixed to one end of the rotating shaft of the limiting frame.

[0015] Preferably, the bottom of the base is slidably connected to the outside of the first and third slide rails, and the top of the base plate is fixed to one side of the top of the frame.

[0016] Preferably, the sliding frame has a limiting groove on one side, and second slide rails are fixed on both sides of the inner wall of the limiting groove. A second hydraulic cylinder is fixed at the bottom of the inner wall of the limiting groove. A moving component is fixed at the bottom of the support frame, and the moving component is used to move the entire device.

[0017] Preferably, the power assembly includes a first motor and a reducer. The output shaft of the first motor is fixed to the input shaft of the reducer. A gear is fixed to the output shaft of the reducer, and a rack fixed to the top of the frame is meshed with the gear on its outer side.

[0018] One side of the first motor and the reducer are both fixed to one side of the sliding frame.

[0019] Preferably, the above-mentioned pushing component includes a connecting frame, a second motor is fixed to one side of the connecting frame, a lead screw is fixed to the output shaft end of the second motor, a slide plate is threaded to the outside of the lead screw, a connecting rod that movably passes through one side of the connecting frame is fixed to one end of the slide plate, and a push plate is fixed to one end of the connecting rod.

[0020] Preferably, the connecting frame has a sliding rod fixed to the inner wall of the connecting frame, which movably passes through one side of the slide plate; the bottom of the connecting frame is fixed to the push rod end of the second hydraulic cylinder; the outer side of the connecting frame is slidably connected to the inner side of the track groove of the second slide rail; and one end of the lead screw is rotatably connected to the inner side wall of the connecting frame.

[0021] Compared with the prior art, the present invention, by adopting the above technical solution, has the following technical effects:

[0022] 1. By utilizing the rotating roller and the swing cylinder to drive the limit frame to rotate, the height of the tube bundle body can be adjusted flexibly according to the diameter and height of the heat exchange tube bundle body, achieving radial alignment between the tube bundle body and the cylinder. This effectively avoids installation difficulties and sealing problems caused by inaccurate alignment, ensuring the installation quality of the heat exchanger. The adjustment mechanism can adjust the support height to adapt to heat exchange tube bundle bodies of different diameters and heights. One set of equipment can meet the installation needs of tube bundle bodies of various specifications, reducing equipment investment costs and improving the versatility and utilization rate of the equipment.

[0023] Second, through the transmission components such as the first motor, reducer, gears and racks, the sliding frame and adjusting mechanism move along the slide rail. When the adjusting mechanism touches the limit block, it stops, ensuring that the tube bundle body reaches the installation position in the axial position, further improving the installation accuracy.

[0024] Third, when extracting the main body of the tube bundle, simply remove the fixing plate, control the sliding frame to move away from the cylinder along the slide rail, and use the pull rope to connect the limiting plate to the lifting lug. The main body of the tube bundle can then be easily removed from the inside of the cylinder. The vertical edge of the fixing plate abuts against the back of the flange of the cylinder, providing stable support for the cylinder during the extraction of the main body of the tube bundle, preventing the cylinder from shifting due to the extraction of the main body of the tube bundle. The operation process is simple and quick, improving work efficiency. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0027] Figure 2 This is a schematic diagram of the receiving mechanism of this utility model;

[0028] Figure 3 This is a schematic diagram of the structure of the adjustment mechanism of this utility model;

[0029] Figure 4 This is a schematic diagram of the structure of the second hydraulic cylinder of this utility model;

[0030] Figure 5 This is a schematic diagram of the gear structure of this utility model;

[0031] Figure 6 This is a top view cross-sectional structural diagram of the propulsion component of this utility model.

[0032] Explanation of reference numerals in the attached drawings: 1. Support frame; 2. Frame; 3. First slide rail; 4. Receiving mechanism; 41. Base plate; 42. Connecting plate; 43. Side plate; 44. Load-bearing plate; 45. First hydraulic cylinder; 5. Adjusting mechanism; 51. Base; 52. Limiting frame; 53. Rotating roller; 54. Swinging cylinder; 55. Fixed frame; 6. Moving component; 7. Tube bundle body; 8. Baffle plate; 9. Flange; 10. Sliding frame; 11. Limiting element 12. Plate; 13. Pull rope; 14. First motor; 15. Reducer; 16. Rack; 17. Second hydraulic cylinder; 18. Second slide rail; 19. Push assembly; 10. Second motor; 11. Slide plate; 12. Lead screw; 13. Connecting frame; 14. Slide rod; 15. Connecting rod; 16. Push plate; 17. Lifting lug; 18. Cylinder; 18. Fixing plate; 29. ​​Limiting block; 20. Third slide rail; 21. Gear. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0035] Example

[0036] Please see Figure 1-6This utility model provides a technical solution: a heat exchanger-specific tube bundle extraction and installation device, including a support frame 1, a frame 2 fixed on the top of the support frame 1, first slide rails 3 fixed on both sides of the frame 2, and a third slide rail 23 fixed on the top of the frame 2; a sliding frame 10 is slidably connected to the inner side of the track grooves of the first slide rail 3 and the third slide rail 23; a tube bundle body 7 is provided on the top of the support frame 1, several baffles 8 are connected to the outer side of the tube bundle body 7, a tube plate is provided at one end of the tube bundle body 7, and a lifting lug 19 is fixed to the outer side of the tube plate; a receiving mechanism 4 and an adjusting mechanism 5 for adjusting the height of the tube bundle body 7 are respectively provided on one side of the sliding frame 10; a power component is provided on one side of the sliding frame 10, and a pushing component 18 is provided on the upper side of the power component; in this embodiment, the hydraulic cylinder power source is provided by a hydraulic station.

[0037] Limiting plates 11 are fixed on both sides of the sliding frame 10. A pull rope 12 is connected between the limiting plate 11 and the lifting lug 19. A hole for binding with the pull rope 12 is opened on one side of the limiting plate 11. A fixing plate 21 is connected to one end of the frame 2 by bolts. Limiting blocks 22 located at both ends of the third slide rail 23 are fixed on the top of the frame 2. The limiting blocks 22 prevent the sliding frame 10 from exceeding the slide rail range during movement and play a limiting protection role. A cylinder 20 located on the heat exchanger side is provided on one side of the support frame 1. A flange 9 is provided at one end of the cylinder 20.

[0038] The receiving mechanism 4 includes a base plate 41, a first hydraulic cylinder 45 fixed to the top of the base plate 41, a connecting plate 42 fixed to the push rod end of the first hydraulic cylinder 45, a side plate 43 fixed to the top of the connecting plate 42, and a load-bearing plate 44 located on the lower side of the tube bundle body 7 fixed to the top of the side plate 43. The connecting plate 42 drives the side plate 43 and the load-bearing plate 44 to rise. A reinforcing rib (not shown in the figure) is provided between the load-bearing plate 44 and the side plate 43. The load-bearing plate 44 is located on the lower side of the tube bundle body 7. As the load-bearing plate 44 rises, it lifts the tube bundle body 7, thereby adjusting the height of the tube bundle body 7 to facilitate the subsequent separation or installation of the tube bundle body 7 from the heat exchanger shell 20.

[0039] The adjustment mechanism 5 includes several bases 51, with a fixed frame 55 fixed to the top of each base 51. A limit frame 52 is rotatably connected to the inner side of the fixed frame 55. The limit frame 52 is triangular in shape. Two rotating rollers 53 are rotatably connected to the outer side of the limit frame 52. By utilizing the rotatable characteristic of the rotating rollers 53, the distance between the two rotating rollers 53 is adjusted to achieve radial alignment between the tube bundle body 7 and the cylinder 20. The outer side of the rotating rollers 53 is rolled to the outer side of the tube bundle body 7. A swing cylinder 54 is fixed to one side of the fixed frame 55. The swing cylinder 54 outputs... The shaft end is fixed to one end of the rotating shaft of the limiting frame 52. The output shaft of the swing cylinder 54 rotates, which can drive the limiting frame 52 to rotate around the rotating shaft, thereby adjusting the angle of the rotating roller 53 to adapt to the position and angle requirements of the tube bundle body 7 at different operating stages. The bottom of the base 51 is slidably connected to the outside of the first slide rail 3 and the third slide rail 23. The top of the base plate 41 is fixed to one side of the top of the frame 2. Several bases 51 can balance the distribution of the extraction force, reduce the vibration and deformation of the mechanical equipment, thereby improving the stability and safety of the extraction tube bundle body 7.

[0040] A limiting groove is provided on one side of the sliding frame 10, and a second slide rail 17 is fixed on both sides of the inner wall of the limiting groove. A second hydraulic cylinder 16 is fixed at the bottom of the inner wall of the limiting groove. A moving component 6 is fixed at the bottom of the support frame 1. The moving component 6 is used for moving the entire device. The moving component 6 can be an AGV heavy-duty mobile trolley or a flatbed trailer.

[0041] The power assembly includes a first motor 13 and a reducer 14. The output shaft of the first motor 13 is fixed to the input shaft of the reducer 14. A gear 24 is fixed to the output shaft of the reducer 14. A rack 15 fixed to the top of the frame 2 is meshed with the outer side of the gear 24. One side of the first motor 13 and the reducer 14 are both fixed to one side of the sliding frame 10. When the gear 24 rotates, it moves on the rack 15, thereby driving the sliding frame 10 to slide along the first slide rail 3 and the third slide rail 23, so that the sliding frame 10 moves to the work position corresponding to the operating position of the tube bundle body 7. When the gear 24 meshes with the rack 15, the sliding frame 10 moves through the reaction force of the output shaft of the reducer 14.

[0042] The pushing component 18 includes a connecting frame 184. A second motor 181 is fixed to one side of the connecting frame 184. A lead screw 183 is fixed to the output shaft end of the second motor 181. A slide plate 182 is threaded to the outside of the lead screw 183. A connecting rod 186 is fixed to one end of the slide plate 182 and extends through one side of the connecting frame 184. A push plate 187 is fixed to one end of the connecting rod 186. A slide bar 185 guides the movement of the slide plate 182. When the lead screw 183 rotates, the slide plate 182 moves on the lead screw 183, and drives the push plate 187 to move through the connecting rod 186. The push plate 187 pushes the tube bundle body 7, realizing the extraction or insertion of the tube bundle body 7 from the heat exchanger shell 20. The inner wall of the connecting frame 184 is fixed with a slide rod 185 that moves through one side of the slide plate 182. The bottom of the connecting frame 184 is fixed to the push rod end of the second hydraulic cylinder 16. The outer side of the connecting frame 184 is slidably connected to the inner side of the track groove of the second slide rail 17. One end of the lead screw 183 is rotatably connected to the inner side wall of the connecting frame 184. The second hydraulic cylinder 16 pushes the connecting frame 184 to move up and down along the second slide rail 17.

[0043] Working principle: When the tube bundle body 7 needs to be installed inside the heat exchanger shell 20, the bolts need to be removed to remove the fixing plate 21 before installing the tube bundle body 7. First, move the device to one side of the heat exchanger so that the support frame 1 is close to the heat exchanger shell 20. The tube bundle body 7 is placed on top of multiple rotating rollers 53. According to the diameter and height of the heat exchange tube bundle body 7, adjust the support height of the adjustment mechanism 5. Then, the output shaft of the swing cylinder 54 drives the limit frame 52 to rotate. Utilizing the rotatable characteristics of the rotating rollers 53, the tube bundle body 7 is rotated, thereby achieving radial alignment between the tube bundle body 7 and the shell 20 on which the tube bundle body 7 is installed. Tie the two ends of the pull rope 12 to the limit plate 11 and the lifting lug 19 of the heat exchange tube bundle body 7 respectively.

[0044] Then, the first motor 13 is started to work. The output shaft of the first motor 13 drives the input shaft of the reducer 14 to rotate. The output shaft of the reducer 14 drives the gear 24 to rotate. The gear 24 meshes with the rack 15, so that the sliding frame 10 and the adjusting mechanism 5 move along the first slide rail 3 and the third slide rail 23 toward the shell 20 of the heat exchanger. When one side of the adjusting mechanism 5 on the left side touches the side of the limit block 22, the first motor 13 stops working and the pull rope 12 is removed.

[0045] The push rod end of the first hydraulic cylinder 45 is extended to different lengths, so that the load-bearing plate 44 is at different heights according to the diameter of the tube bundle body 7. The output shaft end of the second motor 181 is controlled to drive the lead screw 183 to rotate. The lead screw 183 is threadedly connected to the slide plate 182, so that the slide plate 182 moves along the slide rod 185 to one side of the cylinder 20. The slide rod 185 drives the connecting rod 186 and the push plate 187 to move accordingly. Under the movement of the push plate 187, the tube bundle body 7 is pushed into the inside of the cylinder 20.

[0046] During the extraction of the tube bundle body 7, the vertical edge of the fixing plate 21 abuts against the back of the flange 9 of the cylinder 20. The fixing plate 21 is bolted to one side of the frame 2 to prevent displacement. Then, the sliding frame 10 is controlled to move along the first slide rail 3 and the third slide rail 23 away from the cylinder 20, and the limit plate 11 is connected to the lifting lug 19 by the pull rope 12, so that the tube bundle body 7 can be taken out from the inside of the cylinder 20.

[0047] In summary, by utilizing the rotatable rotating roller 53 and the swing cylinder 54 to drive the limit frame 52 to rotate, the height of the tube bundle body 7 can be adjusted flexibly according to the diameter and height of the heat exchange tube bundle body 7, achieving radial alignment between the tube bundle body 7 and the cylinder 20. This effectively avoids problems such as installation difficulties and poor sealing caused by inaccurate alignment, ensuring the installation quality of the heat exchanger. The adjustment mechanism 5 can adjust the support height to adapt to heat exchange tube bundle bodies 7 of different diameters and heights. One set of equipment can meet the installation requirements of tube bundle bodies 7 of various specifications, reducing equipment investment costs and improving the versatility and utilization of the equipment.

[0048] The sliding frame 10 and the adjusting mechanism 5 move along the slide rail through the transmission components such as the first motor 13, reducer 14, gear 24 and rack 15. When the adjusting mechanism 5 touches the limit block 22, it stops, ensuring that the tube bundle body 7 reaches the installation position in the axial position, which further improves the installation accuracy.

[0049] When extracting the tube bundle body 7, simply remove the fixing plate 21, control the sliding frame 10 to move away from the cylinder 20 along the slide rail, and use the pull rope 12 to connect the limiting plate 11 to the lifting lug 19. The tube bundle body 7 can then be easily removed from the inside of the cylinder 20. The vertical edge of the fixing plate 21 abuts against the back of the flange 9 of the cylinder 20, providing stable support for the cylinder 20 during the extraction of the tube bundle body 7, preventing the cylinder 20 from shifting due to the extraction of the tube bundle body 7. The operation process is simple and quick, improving work efficiency.

[0050] Those skilled in the art will understand that the features described in the various embodiments and / or claims of this utility model can be combined or combined in various ways, even if such combinations or combinations are not explicitly described in this utility model. In particular, the features described in the various embodiments and / or claims of this utility model can be combined or combined in various ways without departing from the spirit and teachings of this utility model. All such combinations and / or combinations fall within the scope of this utility model.

Claims

1. A heat exchanger special bundle extraction device comprising a support frame (1), characterized in that: The support frame (1) has a frame (2) fixed on top, and the frame (2) has a first slide rail (3) fixed on both sides, and a third slide rail (23) fixed on top. The first slide rail (3) and the third slide rail (23) are slidably connected to the inner side of the track groove by a sliding frame (10); The support frame (1) has a tube bundle body (7) at the top, and several baffles (8) are connected to the outside of the tube bundle body (7). One end of the tube bundle body (7) has a tube plate, and a lifting lug (19) is fixed to the outside of the tube plate. The sliding frame (10) is provided with a receiving mechanism (4) and an adjusting mechanism (5) on one side for adjusting the height of the tube bundle body (7). The sliding frame (10) is provided with a power component on one side, and a push component (18) is provided on the upper side of the power component. Limiting plates (11) are fixed on both sides of the sliding frame (10). A pull rope (12) is connected between the limiting plate (11) and the lifting lug (19). A fixing plate (21) is bolted to one end of the frame (2).

2. A special gasket for heat exchanger according to claim 1, characterized in that: The top of the frame (2) is fixed with limiting blocks (22) located at both ends of the third slide rail (23). The support frame (1) has a cylinder (20) located on one side of the heat exchanger. One end of the cylinder (20) has a flange (9).

3. The heat exchanger bundle extraction device of claim 1, wherein: The receiving mechanism (4) includes a base plate (41), a first hydraulic cylinder (45) is fixed on the top of the base plate (41), a connecting plate (42) is fixed on the push rod end of the first hydraulic cylinder (45), a side plate (43) is fixed on the top of the connecting plate (42), and a load-bearing plate (44) located on the lower side of the tube bundle body (7) is fixed on the top of the side plate (43).

4. A special gasket pulling device for heat exchanger tube bundle according to claim 3, characterized in that: The adjustment mechanism (5) includes several bases (51), with a fixed frame (55) fixed on the top of the base (51). A limit frame (52) is rotatably connected to the inner side of the fixed frame (55), and the limit frame (52) is a triangular frame.

5. A special gasket for heat exchanger according to claim 4, characterized in that: Two rotating rollers (53) are rotatably connected to the outside of the limiting frame (52). The rotating rollers (53) are rotatably connected to the outside of the tube bundle body (7). A swing cylinder (54) is fixed on one side of the fixing frame (55). The output shaft end of the swing cylinder (54) is fixed to one end of the rotating shaft of the limiting frame (52).

6. A special gasket pulling device for heat exchanger tube bundle as claimed in claim 5, wherein: The bottom of the base (51) is slidably connected to the outside of the first slide rail (3) and the third slide rail (23), and the top of the base plate (41) is fixed to the top side of the frame (2).

7. A special gasket for heat exchanger according to claim 1, wherein: The sliding frame (10) has a limiting groove on one side, and a second slide rail (17) is fixed on both sides of the inner wall of the limiting groove. A second hydraulic cylinder (16) is fixed at the bottom of the inner wall of the limiting groove. A moving component (6) is fixed at the bottom of the support frame (1). The moving component (6) is used to move the entire device.

8. A special gasket for a plate heat exchanger according to claim 7, characterized in that: The power assembly includes a first motor (13) and a reducer (14). The output shaft of the first motor (13) is fixed to the input shaft of the reducer (14). A gear (24) is fixed to the output shaft of the reducer (14). A rack (15) fixed to the top of the frame (2) is meshed with the outside of the gear (24). One side of the first motor (13) and the reducer (14) are both fixed to one side of the sliding frame (10).

9. A special gasket for a heat exchanger according to claim 7, characterized in that: The pushing assembly (18) includes a connecting frame (184), a second motor (181) is fixed on one side of the connecting frame (184), a lead screw (183) is fixed on the output shaft end of the second motor (181), a sliding plate (182) is threaded to the outside of the lead screw (183), a connecting rod (186) is fixed at one end of the sliding plate (182) and moves through one side of the connecting frame (184), and a push plate (187) is fixed at one end of the connecting rod (186).

10. A special gasket for a heat exchanger according to claim 9, characterized in that: The inner wall of the connecting frame (184) is fixed with a sliding rod (185) that moves through one side of the slide plate (182). The bottom of the connecting frame (184) is fixed to the push rod end of the second hydraulic cylinder (16). The outer side of the connecting frame (184) is slidably connected to the inner side of the track groove of the second slide rail (17). One end of the lead screw (183) is rotatably connected to the inner side wall of the connecting frame (184).

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