Improved flue gas heat exchanger

Abstract

The application discloses an improved flue gas heat exchanger and belongs to the technical field of heat exchangers, comprising two first pipe boxes and two second pipe boxes, a first mounting frame, two first mounting frames, first mounting frames being fixedly connected to one end of the two first pipe boxes, a second mounting frame, two second mounting frames, second mounting frames being fixedly connected to one end of the two second pipe boxes, first mounting grooves being formed in the two second mounting frames, a heat exchange plate bundle, two heat exchange plate bundles, the two heat exchange plate bundles being movably inserted into the two first mounting frames and the two second mounting frames, and a group of positioning grooves being formed in the left and right ends of the two heat exchange plate bundles. The application can realize the detachable method of the core plate bundle, reduces the maintenance difficulty of the welded plate heat exchanger, and greatly saves the maintenance cost.

Description

Technical Field

[0001] This invention relates to the field of heat exchanger technology, and more specifically, to an improved flue gas heat exchanger. Background Technology

[0002] A heat exchanger (also known as a heat exchanger device or heat exchange equipment) is a device used to transfer heat from a hot fluid to a cold fluid to meet specified process requirements. It is an industrial application of convective heat transfer and heat conduction. Heat exchangers can be classified in different ways. According to their operating process, they can be divided into three main categories: indirect-flow type, mixing type, and regenerative type (or regenerative type); according to the compactness of their surfaces, they can be divided into compact type and non-compact type.

[0003] The core component of existing heat exchangers, the heat exchange plate bundle, is formed entirely by welding and cannot be disassembled. Once there is a leak in the plate bundle, it can only be repaired by welding or the entire heat exchanger must be replaced, which greatly limits the maintenance cost and methods. Summary of the Invention

[0004] 1. Technical problems to be solved

[0005] In view of the problems existing in the prior art, the purpose of this invention is to provide an improved flue gas heat exchanger, which can reduce the difficulty of maintenance of welded plate heat exchangers and greatly save maintenance costs by making the core plate bundle detachable.

[0006] 2. Technical Solution

[0007] To solve the above problems, the present invention adopts the following technical solution:

[0008] Improved flue gas heat exchangers include:

[0009] Two first-tube boxes and two second-tube boxes;

[0010] The first mounting frame is provided in two parts, and the two first mounting frames are respectively fixedly connected to the adjacent ends of the two first pipe boxes;

[0011] The second mounting frame is provided in two parts. The two second mounting frames are respectively fixedly connected to the adjacent ends of the two second pipe boxes. The two second mounting frames are each provided with a first mounting groove.

[0012] The heat exchange plate bundle is provided in two, and the two heat exchange plate bundles are movably inserted into the two first mounting frames and the two second mounting frames. A set of positioning grooves is provided at both the left and right ends of the two heat exchange plate bundles.

[0013] The clamping mechanism is configured as four sets, which are respectively arranged in two second mounting frames and connected to four positioning slots.

[0014] The fixing mechanism is configured as multiple sets, each set of fixing mechanisms is disposed on the first mounting frame and the second mounting frame, and the multiple sets of fixing mechanisms are connected to the first mounting frame and the second mounting frame.

[0015] As a preferred embodiment of the present invention, each set of clamping mechanisms includes a clamping component and a limiting component, both of which are disposed within a second mounting frame and are connected to each other.

[0016] As a preferred embodiment of the present invention, the clamping assembly includes a mounting frame, a cylinder, a push plate, and positioning blocks. The mounting frame is disposed within a second mounting frame, the cylinder is mounted within the mounting frame, the push plate is fixedly connected to the extended end of the cylinder, and three positioning blocks are provided. All three positioning blocks are fixedly connected to the push plate, and the three positioning blocks are movably inserted into three positioning slots.

[0017] In a preferred embodiment of the present invention, the limiting component includes a sliding hole, a limiting rod, a limiting hole, and a slider. Two sliding holes, two limiting rods, and two limiting holes are provided. The two sliding holes are respectively opened at the upper and lower ends of the mounting frame. The two limiting rods are fixedly connected within the mounting frame. The two limiting holes are opened on the push plate, and the two limiting holes slide in conjunction with the two limiting rods. The two sliders are respectively fixedly connected at the upper and lower ends of the push plate, and the two sliders slide within the two sliding holes.

[0018] As a preferred embodiment of the present invention, each set of fixing mechanisms includes a first fixing component and a second fixing component, and the first fixing component and the second fixing component are both disposed on the first mounting frame and the second mounting frame.

[0019] As a preferred embodiment of the present invention, the first fixing component includes a first connecting sleeve, a second connecting sleeve, a positioning bolt, and a first nut. Two first connecting sleeves are provided, and the two first connecting sleeves are respectively fixedly connected to two first mounting frames. The second connecting sleeve is fixedly connected to a second mounting frame. The positioning bolt is movably inserted into the two first connecting sleeves and the second connecting sleeve. The first nut is threadedly connected to the surface of the positioning bolt.

[0020] In a preferred embodiment of the present invention, the second fixing component includes a connecting plate, a row of bolts, a connector, and a second nut. The connecting plate is fixedly connected to the second mounting frame and is snapped into the first mounting frame. The row of bolts movably passes through the connecting plate and the first mounting frame. The connector is sleeved on the surface of the row of bolts. Multiple second nuts are provided, and all multiple second nuts are threadedly connected to the surface of the row of bolts.

[0021] As a preferred embodiment of the present invention, each of the two second mounting frames is provided with a set of adjustment mechanisms. Each set of adjustment mechanisms includes a servo motor, a bidirectional lead screw, and a threaded sleeve. The servo motor is mounted at the front end of the second mounting frame, and the output end of the servo motor moves through the second mounting frame. The bidirectional lead screw is rotatably connected to the first mounting groove. Two threaded sleeves are provided, and both threaded sleeves are threadedly connected to the surface of the bidirectional lead screw. The two threaded sleeves are respectively fixedly connected to the two mounting brackets.

[0022] As a preferred embodiment of the present invention, a third mounting groove is provided at both ends of the two heat exchange plate bundles, and a sealing plate is installed in each of the four third mounting grooves.

[0023] As a preferred embodiment of the present invention, two second mounting grooves are provided at the ends of the two heat exchange plate bundles that are close to each other, and a sealing strip is installed in each of the four second mounting grooves.

[0024] 3. Beneficial Effects

[0025] Compared with the prior art, the advantages of this invention are:

[0026] (1) When the heat exchange plate bundle needs to be disassembled, the first nut is removed from the surface of the positioning bolt by wrench. After the first nut is removed, the positioning bolt can be removed from the first connecting sleeve and the second connecting sleeve. After the positioning bolt and the first nut are removed, the second nuts on the upper side are removed one by one from the surface of the row bolt. After the second nuts are removed, the connector is held by hand and removed from the surface of the row bolt. At this time, the row bolt is pushed inward. After the row bolt is removed from the first mounting frame, the first tube box and the first mounting frame on the upper side can be removed from the second mounting frame. After the first tube box and the first mounting frame are removed, the two corresponding cylinders are started to retract. The retraction of the cylinder drives the push plate to retract. The retraction of the push plate causes the push plate to slide in the sliding hole. The movement of the push plate drives the positioning block to move. After the positioning block is removed from the positioning groove, the heat exchange plate bundle can be removed from between the two push plates, thereby completing the disassembly and maintenance of the heat exchange plate bundle and optimizing the problem that the traditional method of welding the heat exchange plate bundle cannot be disassembled.

[0027] (2) When it is necessary to adjust the distance between the two heat exchanger bundles, the output end of the servo motor is first started to rotate. The rotation of the output end of the servo motor drives the bidirectional lead screw to rotate. The rotation of the bidirectional lead screw causes the two threaded sleeves to move on the surface of the bidirectional lead screw. When the bidirectional lead screw rotates forward, the ends of the two threaded sleeves that are close to each other move at the same time. The direction of movement of the two threaded sleeves can be controlled by controlling the forward and reverse rotation of the servo motor. At the same time, the movement of the threaded sleeves drives the mounting bracket to move. And the movement of the mounting bracket moves the heat exchanger bundles, thereby adjusting the distance between the two heat exchanger bundles. Attached Figure Description

[0028] Figure 1 This is an exploded view of the improved flue gas heat exchanger of the present invention.

[0029] Figure 2 This is a front perspective view of the improved flue gas heat exchanger of the present invention;

[0030] Figure 3 This is a schematic diagram of the first tube box of the improved flue gas heat exchanger of the present invention;

[0031] Figure 4 This is a schematic diagram of the heat exchanger plate bundle of the improved flue gas heat exchanger of the present invention;

[0032] Figure 5 This is an exploded view of the clamping mechanism of the improved flue gas heat exchanger of the present invention;

[0033] Figure 6 This is a schematic diagram of the row of bolts in the improved flue gas heat exchanger of the present invention.

[0034] Explanation of the labels in the diagram:

[0035] 1. First pipe box; 2. First mounting frame; 3. First connecting sleeve; 4. Second pipe box; 5. Second mounting frame; 6. Second connecting sleeve; 7. Connecting plate; 8. First mounting groove; 9. Heat exchanger plate bundle; 10. Second mounting groove; 11. Third mounting groove; 12. Sealing strip; 13. Sealing plate; 14. Positioning groove; 15. Servo motor; 16. Two-way lead screw; 17. Threaded sleeve; 18. Mounting bracket; 19. Sliding hole; 20. Limiting rod; 21. Cylinder; 22. Push plate; 23. Positioning block; 24. Limiting hole; 25. Sliding block; 26. Positioning bolt; 27. First nut; 28. Row bolt; 29. ​​Connecting piece; 30. Second nut. Detailed Implementation

[0036] 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 a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0037] Example:

[0038] Please see Figure 1-6 An improved flue gas heat exchanger includes:

[0039] Two first-tube boxes 1 and two second-tube boxes 4;

[0040] The first mounting frame 2 is provided in two parts, and the two first mounting frames 2 are respectively fixedly connected to the adjacent ends of the two first pipe boxes 1;

[0041] The second mounting frame 5 is provided in two parts. The two second mounting frames 5 are respectively fixedly connected to the close ends of the two second pipe boxes 4. The two second mounting frames 5 are provided with a first mounting groove 8.

[0042] The heat exchanger bundle 9 is provided in two parts. The two heat exchanger bundles 9 are movably inserted into the two first mounting frames 2 and the two second mounting frames 5. A set of positioning grooves 14 are provided at both the left and right ends of the two heat exchanger bundles 9.

[0043] In this embodiment, the first mounting frame 2 is for easy fixing of the first tube box 1, the second mounting frame 5 is for easy connection of the second tube box 4, and the positioning groove 14 is for easy insertion of the positioning block 23. It should be noted that the heat exchange plate bundle 9 is common knowledge to those skilled in the art, so its internal structure will not be described in detail.

[0044] Specifically, the clamping mechanism is configured as four sets, which are respectively set in two second mounting frames 5, and the four sets of clamping mechanisms are connected to four sets of positioning slots 14. Each set of clamping mechanisms includes a clamping component and a limiting component, which are both set in the second mounting frame 5 and connected to each other.

[0045] In this embodiment, each clamping mechanism includes a clamping component and a limiting component. The clamping component and the limiting component are both disposed within the second mounting frame 5 and are connected to each other.

[0046] Specifically, the clamping assembly includes a mounting frame 18, a cylinder 21, a push plate 22, and positioning blocks 23. The mounting frame 18 is set inside the second mounting frame 5, the cylinder 21 is installed inside the mounting frame 18, the push plate 22 is fixedly connected to the extended end of the cylinder 21, and there are three positioning blocks 23. All three positioning blocks 23 are fixedly connected to the push plate 22, and the three positioning blocks 23 are movably inserted into the three positioning slots 14.

[0047] In this embodiment, the mounting bracket 18 is for easy fixing of the cylinder 21, and the cylinder 21 is for easy driving of the push plate 22 to move. The heat exchange plate bundle 9 is clamped by the push plate 22 driven by the cylinder 21. The positioning block 23 is for easy engagement with the positioning groove 14. The engagement between the positioning block 23 and the positioning groove 14 optimizes the stability of the fixation of the heat exchange plate bundle 9.

[0048] Specifically, the limiting component includes a sliding hole 19, a limiting rod 20, a limiting hole 24, and a slider 25. Each of the sliding holes 19, limiting rods 20, limiting holes 24, and sliders 25 is provided in pairs. The two sliding holes 19 are respectively opened at the upper and lower ends of the mounting bracket 18. The two limiting rods 20 are fixedly connected to the mounting bracket 18. The two limiting holes 24 are respectively opened on the push plate 22, and the two limiting holes 24 and the two limiting rods 20 are slidably engaged. The two sliders 25 are respectively fixedly connected at the upper and lower ends of the push plate 22, and the two sliders 25 are slidably connected to the two sliding holes 19.

[0049] In this embodiment, the sliding hole 19 is provided to facilitate the sliding of the slider 25, and the limiting hole 24 is provided to facilitate the sliding of the limiting rod 20. The sliding cooperation between the sliding hole 19 and the slider 25 optimizes the stability of the push plate 22's movement, and the sliding cooperation between the limiting rod 20 and the limiting hole 24 further optimizes the stability of the push plate 22's movement.

[0050] Specifically, the fixing mechanism is configured as multiple sets, and all sets of fixing mechanisms are set on the first mounting frame 2 and the second mounting frame 5. The multiple sets of fixing mechanisms are connected to the first mounting frame 2 and the second mounting frame 5. Each set of fixing mechanisms includes a first fixing component and a second fixing component, and both the first fixing component and the second fixing component are set on the first mounting frame 2 and the second mounting frame 5.

[0051] In this embodiment, each fixing mechanism includes a first fixing component and a second fixing component, and both the first fixing component and the second fixing component are disposed on the first mounting frame 2 and the second mounting frame 5.

[0052] Specifically, the first fixing component includes a first connecting sleeve 3, a second connecting sleeve 6, a positioning bolt 26, and a first nut 27. There are two first connecting sleeves 3, which are respectively fixedly connected to two first mounting frames 2. The second connecting sleeve 6 is fixedly connected to the second mounting frame 5. The positioning bolt 26 is movably inserted into the two first connecting sleeves 3 and the second connecting sleeve 6. The first nut 27 is threadedly connected to the surface of the positioning bolt 26.

[0053] In this embodiment, the first connecting sleeve 3 is for easy cooperation with the second connecting sleeve 6. The first connecting sleeve 3 and the second connecting sleeve 6 are fixed to facilitate the movement of the positioning bolt 26. The first mounting frame 2 and the second mounting frame 5 are fixed by the threaded cooperation of the positioning bolt 26 and the first nut 27.

[0054] Specifically, the second fixing component includes a connecting plate 7, a row of bolts 28, a connector 29, and a second nut 30. The connecting plate 7 is fixedly connected to the second mounting frame 5 and is snapped into the first mounting frame 2. The row of bolts 28 movably passes through the connecting plate 7 and the first mounting frame 2. The connector 29 is sleeved on the surface of the row of bolts 28. Multiple second nuts 30 are provided, and all multiple second nuts 30 are threadedly connected to the surface of the row of bolts 28.

[0055] In this embodiment, the connecting plate 7 is for easy engagement with the first mounting frame 2. The cooperation between the first mounting frame 2 and the connecting plate 7 facilitates the movement of the row bolts 28 through, and the first mounting frame 2 and the connecting plate 7 are fixed by the threaded engagement of the row bolts 28 and the second nut 30. The connector 29 is for easy connection of the row bolts 28, and optimizes the stability of the fixing of the row bolts 28 and the second nut 30.

[0056] Specifically, each of the two second mounting frames 5 is provided with an adjustment mechanism. Each adjustment mechanism includes a servo motor 15, a bidirectional lead screw 16, and a threaded sleeve 17. The servo motor 15 is installed at the front end of the second mounting frame 5, and the output end of the servo motor 15 moves through the second mounting frame 5. The bidirectional lead screw 16 is rotatably connected to the first mounting groove 8. There are two threaded sleeves 17, and both threaded sleeves 17 are threaded to the surface of the bidirectional lead screw 16. The two threaded sleeves 17 are fixedly connected to the two mounting brackets 18 respectively.

[0057] In this embodiment, the output end of the servo motor 15 is started to rotate. The rotation of the output end of the servo motor 15 drives the bidirectional lead screw 16 to rotate. The rotation of the bidirectional lead screw 16 causes the two threaded sleeves 17 to move on the surface of the bidirectional lead screw 16. When the bidirectional lead screw 16 rotates clockwise, the ends of the two threaded sleeves 17 move closer together. The direction of movement of the two threaded sleeves 17 can be controlled by controlling the forward and reverse rotation of the servo motor 15. At the same time, the movement of the threaded sleeves 17 drives the mounting bracket 18 to move. And the movement of the mounting bracket 18 moves the heat exchange plate bundle 9, thereby adjusting the distance between the two heat exchange plate bundles 9.

[0058] Specifically, each of the two heat exchange plate bundles 9 has a third mounting groove 11 at both ends, and a sealing plate 13 is installed in each of the four third mounting grooves 11.

[0059] In this embodiment, the third mounting groove 11 is provided to facilitate the installation of the sealing plate 13. The cooperation between the third mounting groove 11 and the sealing plate 13 optimizes the sealing performance of the heat exchange plate bundle 9 and the push plate 22 combination.

[0060] Specifically, two second mounting slots 10 are provided at the ends of the two heat exchange plate bundles 9 that are close to each other, and sealing strips 12 are installed in the four second mounting slots 10.

[0061] In this embodiment, the second mounting groove 10 is provided to facilitate the installation of the sealing strip 12. The sealing effect of the heat exchange plate bundle 9 is optimized through the cooperation between the second mounting groove 10 and the sealing strip 12.

[0062] Working principle: When it is necessary to disassemble the heat exchanger plate bundle 9, firstly, use a wrench to remove the first nut 27 from the surface of the positioning bolt 26. After the first nut 27 is removed, the positioning bolt 26 can be removed from the first connecting sleeve 3 and the second connecting sleeve 6. After the positioning bolt 26 and the first nut 27 are removed, remove the upper second nuts 30 one by one from the surface of the row bolts 28. After the second nuts 30 are removed, hold the connector 29 and remove the connector 29 from the surface of the row bolts 28. At this time, push the row bolts 28 inward. When the row bolts 28 are disengaged from the first mounting frame 2, the upper first tube box 1 and the first mounting frame 2 can be removed from the second mounting frame 5. After the first tube box 1 and the first mounting frame 2 are removed, the two corresponding cylinders 21 are activated to retract. The retraction of the cylinders 21 drives the push plate 22 to retract. The contraction causes the push plate 22 to slide within the sliding hole 19. The movement of the push plate 22 moves the positioning block 23. Once the positioning block 23 disengages from the positioning groove 14, the heat exchanger bundle 9 can be removed from between the two push plates 22, thus completing the disassembly and maintenance of the heat exchanger bundle 9. This optimizes the problem of the traditional method where the heat exchanger bundle 9 cannot be disassembled due to welding. When adjusting the distance between the two heat exchanger bundles 9, the output end of the servo motor 15 is first started to rotate. The rotation of the output end of the servo motor 15 drives the bidirectional lead screw 16 to rotate. The rotation of the bidirectional lead screw 16 causes the two threaded sleeves 17 to move on the surface of the bidirectional lead screw 16. When the bidirectional lead screw 16 rotates forward, the ends of the two threaded sleeves 17 move towards each other simultaneously. By controlling the forward and reverse rotation of the servo motor 15, the direction of movement of the two threaded sleeves 17 can be controlled. Simultaneously, the movement of the threaded sleeves 17 drives the mounting bracket 18 to move. Furthermore, the movement of the mounting bracket 18 moves the heat exchanger bundle 9, thereby adjusting the distance between the two heat exchanger bundles 9.

[0063] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concept, should be covered within the scope of protection of the present invention.

Claims

1. An improved flue gas heat exchanger, characterized in that, include: Two first pipe boxes (1) and two second pipe boxes (4); The first mounting frame (2) is provided in two parts, and the two first mounting frames (2) are respectively fixedly connected to the two first pipe boxes (1) at their close ends; The second mounting frame (5) is provided in two parts. The two second mounting frames (5) are respectively fixedly connected to the two second pipe boxes (4) at their close ends. The two second mounting frames (5) are provided with a first mounting groove (8). The heat exchange plate bundle (9) is configured as two, and the two heat exchange plate bundles (9) are movably inserted between the two first mounting frames (2) and the two second mounting frames (5). A set of positioning grooves (14) are provided at both the left and right ends of the two heat exchange plate bundles (9). The clamping mechanism is configured as four sets, and the four sets of clamping mechanisms are respectively set in two second mounting frames (5), and the four sets of clamping mechanisms are connected to four sets of positioning grooves (14). The fixing mechanism is configured as multiple sets, and the multiple sets of fixing mechanisms are all set on the first mounting frame (2) and the second mounting frame (5), and the multiple sets of fixing mechanisms are connected to the first mounting frame (2) and the second mounting frame (5); Each of the two second mounting frames (5) is provided with a set of adjustment mechanisms, each set of adjustment mechanisms including a servo motor (15), a two-way lead screw (16) and a threaded sleeve (17). Both ends of the two heat exchange plate bundles (9) are provided with a third mounting groove (11), in which a sealing plate (13) is installed. A second mounting groove (10) is provided at one end of the two heat exchange plate bundles (9) that are close to each other, and a sealing strip (12) is installed in the groove.

2. The improved flue gas heat exchanger according to claim 1, characterized in that: Each clamping mechanism includes a clamping component and a limiting component, both of which are disposed within the second mounting frame (5) and are connected to each other.

3. The improved flue gas heat exchanger according to claim 2, characterized in that: The clamping assembly includes a mounting frame (18), a cylinder (21), a push plate (22), and positioning blocks (23). The mounting frame (18) is located in the second mounting frame (5). The cylinder (21) is installed in the mounting frame (18). The push plate (22) is fixedly connected to the extended end of the cylinder (21). There are three positioning blocks (23). All three positioning blocks (23) are fixedly connected to the push plate (22), and the three positioning blocks (23) are movably inserted into the three positioning slots (14).

4. The improved flue gas heat exchanger according to claim 3, characterized in that: The limiting component includes a sliding hole (19), a limiting rod (20), a limiting hole (24), and a slider (25). Each of the sliding holes (19), limiting rods (20), limiting holes (24), and sliders (25) is configured as two. The two sliding holes (19) are respectively opened at the upper and lower ends of the mounting bracket (18). The two limiting rods (20) are fixedly connected to the mounting bracket (18). The two limiting holes (24) are opened on the push plate (22), and the two limiting holes (24) are slidably engaged with the two limiting rods (20). The two sliders (25) are respectively fixedly connected to the upper and lower ends of the push plate (22), and the two sliders (25) are slidably connected to the two sliding holes (19).

5. The improved flue gas heat exchanger according to claim 4, characterized in that: Each of the fixing mechanisms includes a first fixing component and a second fixing component, both of which are disposed on the first mounting frame (2) and the second mounting frame (5).

6. The improved flue gas heat exchanger according to claim 5, characterized in that: The first fixing component includes a first connecting sleeve (3), a second connecting sleeve (6), a positioning bolt (26), and a first nut (27). There are two first connecting sleeves (3), which are respectively fixedly connected to two first mounting frames (2). The second connecting sleeve (6) is fixedly connected to the second mounting frame (5). The positioning bolt (26) is movably inserted into the two first connecting sleeves (3) and the second connecting sleeve (6). The first nut (27) is threadedly connected to the surface of the positioning bolt (26).

7. The improved flue gas heat exchanger according to claim 6, characterized in that: The second fixing component includes a connecting plate (7), a row of bolts (28), a connector (29), and a second nut (30). The connecting plate (7) is fixedly connected to the second mounting frame (5). The connecting plate (7) is snapped into the first mounting frame (2). The row of bolts (28) movably passes through the connecting plate (7) and the first mounting frame (2). The connector (29) is sleeved on the surface of the row of bolts (28). There are multiple second nuts (30), and all of the multiple second nuts (30) are threadedly connected to the surface of the row of bolts (28).

8. The improved flue gas heat exchanger according to claim 7, characterized in that: Each of the two second mounting frames (5) is provided with a set of adjustment mechanisms. Each set of adjustment mechanisms includes a servo motor (15), a bidirectional lead screw (16), and a threaded sleeve (17). The servo motor (15) is installed at the front end of the second mounting frame (5), and the output end of the servo motor (15) moves through the second mounting frame (5). The bidirectional lead screw (16) is rotatably connected in the first mounting groove (8). There are two threaded sleeves (17). Both threaded sleeves (17) are threaded to the surface of the bidirectional lead screw (16). The two threaded sleeves (17) are fixedly connected to the two mounting brackets (18) respectively.

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