Overhaul platform for steam turbine cylinder of power plant

Abstract

The utility model relates to the technical field of power plant steam turbine cylinders, in particular to a power plant steam turbine cylinder maintenance platform. Comprising a maintenance platform body and a first handle. A storage long groove is formed in the front side of the maintenance platform body, a storage assembly is slidably mounted in the storage long groove, a first connecting long groove and a connecting square groove are formed in the inner bottom wall of the storage long groove, a trapezoidal long groove is formed in the inner bottom wall of the connecting square groove, and a first supporting assembly is slidably mounted in the first connecting long groove. A second supporting assembly is slidably mounted in the connecting square groove, first limiting square grooves are formed in the left inner side wall and the right inner side wall of the long storage groove, second threaded grooves are formed in the rear inner side walls of the first limiting square grooves, and first limiting assemblies are movably mounted in the first limiting square grooves. The technical problems that overhauling and maintenance are inconvenient are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of power plant steam turbine cylinders, in particular to an overhaul platform for a power plant steam turbine cylinder. Background Technique

[0002] A power plant steam turbine refers to an external combustion rotary machine applied in a thermal power plant. It first converts the thermal energy of steam from a power plant boiler into mechanical energy, then transfers the mechanical energy to the generator rotor, and then the generator converts the mechanical energy into electrical energy. The electrical energy is input into the power grid through a transformer. A power plant steam turbine consists of a rotating part and a stationary part. The rotor includes a main shaft, impellers, moving blades, couplings, etc., and the stator includes an inlet steam part, a cylinder, diaphragms, stationary blade cascades, steam seals, bearings, etc. During the use of a power plant steam turbine, in order to maintain the normal operation of the power plant steam turbine, maintenance personnel need to regularly disassemble the cylinder inside the power plant steam turbine and overhaul the cylinder by using a variety of maintenance tools. When the maintenance personnel overhaul the cylinder disassembled from the power plant steam turbine, a platform is required. Therefore, an overhaul platform for a power plant steam turbine cylinder is needed.

[0003] For this reason, Chinese Patent No. CN214265459U discloses an overhaul platform for a steam turbine cylinder in a thermal power plant, including an overhaul platform. A positioning column is fixedly connected to the top of the overhaul platform, and a support column is fixedly connected to the bottom of the overhaul platform. A bottom plate is movably connected to the top of the overhaul platform, a connecting shaft is movably connected to the top of the bottom plate, and a first gear is fixedly connected to the outer surface of the connecting shaft. The advantages of the utility model are as follows: By setting the connecting shaft, the bottom plate and the support plate are movably connected through the connecting shaft. During the overhaul process, the motor is started to rotate the second gear, and the first gear is rotated through the transmission chain, so that the connecting shaft and the support plate rotate. At the same time, the fixing plate rotates at the bottom of the connecting plate, and the positioning block rotates inside the fixing plate for positioning, so that the entire steam turbine cylinder rotates, which can avoid the staff rotating around the steam turbine cylinder for overhaul, reduce the overhaul time, and improve the overhaul efficiency.

[0004] However, in this patent, after the steam turbine cylinder is disassembled, during the maintenance process of the steam turbine cylinder on the maintenance platform by the maintenance personnel, generally multiple maintenance tools are needed, and the multiple maintenance tools are generally stored in the maintenance tool storage area. Since the maintenance platform is a flat plate and no storage space is provided inside the maintenance platform, it is impossible to store the multiple maintenance tools. This will cause the maintenance personnel to first go to the maintenance tool storage area to pick up the multiple maintenance tools when maintaining the steam turbine cylinder on the maintenance platform, and then carry the multiple maintenance tools to the placement area to maintain the steam turbine cylinder on the maintenance platform, thus increasing the difficulty of maintenance. Moreover, in this patent, since the maintenance of the steam turbine cylinder also includes cleaning the dirt inside the steam turbine cylinder, after the maintenance personnel complete the maintenance of the steam turbine cylinder, the maintenance platform will be contaminated with dirt and become dirty. In order to maintain and service the maintenance platform, the dirt on the maintenance platform needs to be cleaned in time. Since no cleaning device is provided on the maintenance platform, the maintenance personnel cannot directly clean the dirt through the cleaning device on the maintenance platform. This will cause the maintenance personnel to clean the dirt by holding a cleaning device such as a scraper or a brush, thus increasing the difficulty of maintenance and service. Utility Model Content

[0005] The utility model provides a maintenance platform for a power plant steam turbine cylinder to solve the problems of inconvenient maintenance, inconvenient maintenance and service in the prior art, and can facilitate maintenance and facilitate maintenance and service.

[0006] To achieve the above object, the utility model provides the following technical solution: A maintenance platform for a power plant steam turbine cylinder, comprising a maintenance platform main body and a first handle; a storage long groove is opened on the front side of the maintenance platform main body, a storage component is slidably installed inside the storage long groove, a first connection long groove and a connection square groove are respectively opened on the inner bottom wall of the storage long groove, second connection long grooves are opened on both the left and right sides of the first connection long groove, a second limit square groove is opened on an inner side wall of the second connection long groove away from the first connection long groove, a trapezoidal long groove is opened on the inner bottom wall of the connection square groove, a first support component is slidably installed inside the first connection long groove, a second support component is slidably installed inside the connection square groove, first limit square grooves are opened on both the left and right inner side walls of the storage long groove, a second thread groove is opened on the rear inner side wall of the first limit square groove, and a first limit component is movably installed inside the first limit square groove.

[0007] Further, the storage component includes an open storage box, the open storage box is slidably installed inside the storage long groove, and a second handle is fixedly connected to the front side of the open storage box.

[0008] Further, the first support assembly includes a first connecting long plate which is slidably installed inside the first connecting long groove. The top of the first connecting long plate is fixedly installed at the bottom of the open storage box. Both the left and right sides of the first connecting long plate are fixedly connected with second connecting long plates which are slidably installed inside the second connecting long grooves. One side of the second connecting long plate far from the first connecting long plate is fixedly connected with a limit block, the top of the limit block is fixedly installed at the bottom of the open storage box, and the limit block is slidably installed inside the second limit square groove.

[0009] Further, the second support assembly includes a connecting long rod which is slidably installed inside the connecting square groove. The bottom of the connecting long rod is fixedly connected with a trapezoidal block which is slidably installed inside the trapezoidal long groove.

[0010] Further, the first limit assembly includes a support square plate which is movably installed inside the first limit square groove. One side of the support square plate is fixedly installed at one side of the open storage box. A second screw rod is threadedly connected inside the support square plate, and the second screw rod is threadedly connected with the second thread groove.

[0011] Further, the cleaning assembly includes a support long rod. The left side of the support long rod is fixedly installed at the right side of the first handle. The bottom of the support long rod is respectively fixedly connected with a scraping long plate and two support vertical plates. The scraping long plate is fixedly installed between the two support vertical plates. The bottoms of the two support vertical plates are both fixedly connected with positioning long plates. One side of the support vertical plate far from the scraping long plate is fixedly connected with an L-shaped rod.

[0012] Further, the third support assembly includes a support long plate. The front and rear sides of the support long plate and the front and rear sides of the maintenance platform main body are both fixedly connected with positioning long rods which are respectively slidably connected with the support vertical plates and the L-shaped rods. The support long plate and the maintenance platform main body are both movably connected with the scraping long plate. The bottom of the positioning long rod is fixedly connected with a convex long plate which is slidably installed inside the L-shaped rod. The top of the positioning long rod is respectively provided with a first thread groove and a positioning long groove, and the positioning long plate is slidably installed inside the positioning long groove.

[0013] Further, the second limit assembly includes a support vertical rod. The top of the support vertical rod is fixedly installed at the bottom of the first handle. The right side of the support vertical rod is fixedly installed at the left side of the support vertical plate. The support vertical rod is slidably connected with the positioning long rod. A first screw rod is threadedly connected inside the support vertical rod and the first handle, and the first screw rod is threadedly connected with the first thread groove.

[0014] The working principle and usage principle of the present utility model are as follows: During the use of this device, through the storage component, the first support component, the first support component, and the first limiting component, various maintenance tools can be stored inside this device, avoiding the need for maintenance personnel to first go to the maintenance tool storage area to pick up various maintenance tools and then perform maintenance on the steam turbine cylinder on its maintenance platform. This avoids increasing the difficulty of maintaining the steam turbine cylinder due to the inability of maintenance personnel to conveniently pick up maintenance tools. And during the use of this device, through the cleaning component, the third support component, and the second limiting component, maintenance personnel can directly clean dirt through the cleaning component on this device when maintaining and servicing this device, avoiding increasing the difficulty of maintenance and servicing due to the need for maintenance personnel to hold cleaning devices such as scrapers or brushes to clean dirt.

[0015] The beneficial technical effects of the present utility model are:

[0016] Through the settings of the storage component, the first support component, the first support component, and the first limiting component, various maintenance tools can be stored inside this device, enabling maintenance personnel to avoid first going to the maintenance tool storage area to pick up various maintenance tools and then performing maintenance on the steam turbine cylinder on its maintenance platform, enabling this device to avoid increasing the difficulty of maintaining the steam turbine cylinder due to the inability of maintenance personnel to conveniently pick up maintenance tools, enabling this device to facilitate maintenance. And through the settings of the cleaning component, the third support component, and the second limiting component, maintenance personnel can directly clean dirt through the cleaning component on this device when maintaining and servicing this device, enabling this device to avoid increasing the difficulty of maintenance and servicing due to the need for maintenance personnel to hold cleaning devices such as scrapers or brushes to clean dirt, enabling this device to facilitate maintenance and servicing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Other features, objectives, and advantages of the present utility model will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0018] Figure 1 is the first front three-dimensional schematic diagram of the present utility model.

[0019] Figure 2 is the three-dimensional schematic diagram of the main body of the maintenance platform of the present utility model.

[0020] Figure 3 is the three-dimensional schematic diagram of the open storage box of the present utility model.

[0021] Figure 4 is the three-dimensional schematic diagram of the first handle of the present utility model.

[0022] Figure 5 is the three-dimensional schematic diagram of the scraping long board of the present utility model.

[0023] Figure 6 This is the second front elevation three-dimensional schematic diagram of the utility model.

[0024] Figure 7 This is the three-dimensional schematic diagram of the L-shaped rod of the utility model.

[0025] Figure 8 This is the third front elevation three-dimensional schematic diagram of the utility model.

[0026] Figure 9 This is the three-dimensional schematic diagram of the first connecting long plate of the utility model.

[0027] Description of the reference numerals in the figure: 1. First screw; 2. Support long rod; 3. First handle; 4. Scratching long plate; 5. Support long plate; 6. Positioning long rod; 7. Positioning long groove; 8. Convex long plate; 9. Open storage box; 10. First connecting long plate; 11. Second handle; 12. Connecting long rod; 13. Second screw; 14. First limiting square groove; 15. Second connecting long plate; 16. First connecting long groove; 17. Second connecting long groove; 18. Connecting square groove; 19. Support square plate; 20. Maintenance platform main body; 21. Support vertical rod; 22. L-shaped rod; 23. Support vertical plate; 24. Storage long groove; 25. First thread groove; 26. Second thread groove; 27. Second limiting square groove; 28. Trapezoidal block; 29. Positioning long plate; 30. Limiting block; 31. Trapezoidal long groove. Detailed implementation manners

[0028] The following further describes a maintenance platform for a power plant steam turbine cylinder of the utility model in conjunction with the accompanying drawings and specific embodiments.

[0029] Such as Figures 1 to 9As shown: a power plant steam turbine cylinder maintenance platform, including a maintenance platform body 20, a first handle 3, an open storage box 9, a first connecting long board 10, a connecting long rod 12 and a supporting square board 19, a storage long slot 24 is provided on the front side of the maintenance platform body 20, a first connecting long slot 16 and a connecting square slot 18 are respectively provided on the inner bottom wall of the storage long slot 24, a second connecting long slot 17 is provided on the left and right sides of the first connecting long slot 16, a second limiting square slot 27 is provided on an inner side wall of the second connecting long slot 17 away from the first connecting long slot 16, a trapezoidal long slot 31 is provided on the inner bottom wall of the connecting square slot 18, a first limiting square slot 14 is provided on the left and right inner side walls of the storage long slot 24, a second threaded slot 26 is provided on the rear inner side wall of the first limiting square slot 14, a second handle 11 is fixedly connected to the front side of the open storage box 9, and a second connecting long board 10 is fixedly connected to the left and right sides of the second connecting The long plate 15, the second connecting long plate 15 is fixedly connected to the limiting block 30 on one side away from the first connecting long plate 10, the bottom of the connecting long rod 12 is fixedly connected with a trapezoidal block 28, the first limiting assembly includes a supporting square plate 19, one side of the supporting square plate 19 is fixedly installed on one side of the open storage box 9, the internal thread of the supporting square plate 19 is connected with the second screw 13, the number of the second screw 13 is two, the second screw 13 is threadedly connected with the second thread groove 26, through the arrangement of the storage assembly, the first supporting assembly, the first supporting assembly and the first limiting assembly, a variety of maintenance tools can be stored inside the device, so that maintenance personnel can avoid going to the maintenance tool storage place to take a variety of maintenance tools and then repairing the turbine cylinder on its maintenance platform, so that the device can avoid the difficulty of repairing the turbine cylinder due to the maintenance personnel being unable to pick up the maintenance tools at hand, so that the device can be convenient for maintenance.

[0030] During use, various maintenance tools are stored inside the open storage box 9. The second screw rod 13 is threadedly connected to the second thread groove 26, and the first screw rod 1 is threadedly connected to the first thread groove 25. When maintenance personnel need to use this device to maintain the cylinder removed from the steam turbine, they move the steam turbine cylinder so that the steam turbine cylinder is located on the main body 20 of the maintenance platform. At the same time, they rotate the two second screw rods 13 to disconnect the second screw rods 13 from the second thread grooves 26. Then they pull the second handle 11, causing the support square plate 19 to slide along the first limit square groove 14, the open storage box 9 to slide along the storage long groove 24, the first connecting long plate 10 to slide along the first connecting long groove 16, the second connecting long plate 15 to slide along the second connecting long groove 17, the limit block 30 to slide along the second limit square groove 27, the connecting long rod 12 to slide along the connecting square groove 18, and the trapezoidal block 28 to slide along the trapezoidal long groove 31. When the open storage box 9 slides to the maximum distance, the support square plate 19 is disconnected from the first limit square groove 14, and most of the open storage box 9 slides out of the storage long groove 24, exposing the inside of the open storage box 9. Then they take the maintenance tools in the open storage box 9. After taking them, they push the second handle 11 to make the open storage box 9 completely enter the storage long groove 24 and the support square plate 19 enter the first limit square groove 14. At this time, maintenance personnel can use this device to maintain the cylinder removed from the steam turbine. During this process, various maintenance tools can be stored in the open storage box 9 inside this device, enabling maintenance personnel to avoid first going to the maintenance tool storage area to get various maintenance tools and then maintaining the steam turbine cylinder on the maintenance platform. This device can avoid increasing the difficulty of maintaining the steam turbine cylinder due to maintenance personnel being unable to pick up maintenance tools conveniently, making this device convenient for maintenance.

[0031] Such as Figures 1 to 9As shown: A maintenance platform for a steam turbine cylinder in a power plant, including a maintenance platform main body 20, a first handle 3, a support long rod 2, a support long plate 5 and a support vertical rod 21. Scrubbing long plates 4 and two support vertical plates 23 are fixedly connected to the bottom of the support long rod 2 respectively. Positioning long plates 29 are fixedly connected to the bottoms of the two support vertical plates 23. An L-shaped rod 22 is fixedly connected to the side of the support vertical plate 23 away from the scrubbing long plate 4. Positioning long rods 6 are fixedly connected to the front and rear sides of the support long plate 5 and the front and rear sides of the maintenance platform main body 20 respectively. A convex long plate 8 is fixedly connected to the bottom of the positioning long rod 6. A first threaded groove 25 and a positioning long groove 7 are respectively formed at the top of the positioning long rod 6. A first screw rod 1 is commonly threadedly connected to the inside of the support vertical rod 21 and the inside of the first handle 3. The number of the first screw rods 1 is two. The first screw rod 1 is threadedly connected to the first threaded groove 25. Through the arrangement of the cleaning component, the third support component and the second limiting component, when maintenance personnel maintain and service this device, they can directly clean the dirt through the cleaning component on this device, so that this device can avoid increasing the difficulty of maintenance and service due to the need for maintenance personnel to hold cleaning devices such as scrapers or brushes to clean the dirt, and make this device convenient for maintenance and service.

[0032] During use, since the maintenance of the steam turbine cylinder also includes cleaning the dirt inside the steam turbine cylinder, after the maintenance personnel complete the maintenance of the steam turbine cylinder, the main body 20 of the maintenance platform will be contaminated with dirt and become dirty. In order to maintain and service the main body 20 of the maintenance platform, it is necessary to clean the dirt on the main body 20 of the maintenance platform in a timely manner. After the maintenance personnel use this device and a variety of maintenance tools in the internal open storage box 9 of this device to complete the maintenance of the cylinder disassembled from the steam turbine, when the maintenance personnel directly clean the dirt through the cleaning component on this device, move the cylinder off the main body 20 of the maintenance platform, and at the same time rotate the two first screws 1 so that the first screws 1 are disengaged from the first thread grooves 25. Push the first handle 3 to the right, so that the support vertical plate 23, the support vertical rod 21 and the L-shaped rod 22 all slide along the positioning long rod 6, so that the positioning long plate 29 slides along the positioning long groove 7, and the L-shaped rod 22 slides along the convex long plate 8, and the support long rod 2 moves to the right. The scraping long plate 4 slides along the support long plate 5 and the main body 20 of the maintenance platform respectively. When the scraping long plate 4 slides to the maximum distance to the right, pull the first handle 3 to the left, so that the support long rod 2 moves to the left, and the scraping long plate 4 slides to the left along the main body 20 of the maintenance platform and the support long plate 5 respectively. Repeat the above steps to make the scraping long plate 4 slide back and forth to the left and right along the main body 20 of the maintenance platform and the support long plate 5 respectively. Under the action of the scraping long plate 4, the scraping long plate 4 can scrape the dirt on the main body 20 of the maintenance platform. At this time, the maintenance personnel can directly clean the dirt through the cleaning component on this device. During this process, when the maintenance personnel maintain and service the main body 20 of the maintenance platform, they can directly clean the dirt on the main body 20 of the maintenance platform through the cleaning component on this device, so that this device can avoid increasing the difficulty of maintenance and service due to the need for the maintenance personnel to hold cleaning devices such as scrapers or brushes to clean the dirt, and make this device convenient for maintenance and service.

[0033] In this embodiment, the second limiting square groove 27 communicates with the second connecting long groove 17, and the first thread groove 25 is located on the left side of the positioning long groove 7.

Claims

1. A maintenance platform for a steam turbine cylinder in a power plant, comprising a maintenance platform main body (20) and a first handle (3); characterized in that : A storage slot (24) is provided on the front side of the main body (20) of the maintenance platform. A storage component is slidably installed inside the storage slot (24). The inner bottom wall of the storage slot (24) is respectively provided with a first connecting slot (16) and a connecting square slot (18). Second connecting slots (17) are provided on both the left and right sides of the first connecting slot (16). A second limiting square slot (27) is provided on the inner side wall of the second connecting slot (17) away from the first connecting slot (16). A trapezoidal slot (31) is provided on the inner bottom wall of the connecting square slot (18). A first support component is slidably installed inside the first connecting slot (16). A second support component is slidably installed inside the connecting square slot (18). First limiting square slots (14) are provided on both the left and right inner side walls of the storage slot (24). A second threaded slot (26) is provided on the rear inner side wall of the first limiting square slot (14). A first limiting component is movably installed inside the first limiting square slot (14). A cleaning component is fixedly installed on the right side of the first handle (3). A third support component is fixedly installed on the left side of the main body (20) of the maintenance platform. A second limiting component is fixedly installed on the bottom of the first handle (3).

2. The overhaul platform for the steam turbine cylinder of a power plant according to claim 1, wherein: The storage component includes an open storage box (9), and the open storage box (9) is slidably installed inside the storage slot (24). A second handle (11) is fixedly connected to the front side of the open storage box (9).

3. A maintenance platform for a power plant steam turbine cylinder according to claim 1, characterized in that: The first support component includes a first connecting long plate (10), and the first connecting long plate (10) is slidably installed inside the first connecting slot (16). The top of the first connecting long plate (10) is fixedly installed on the bottom of the open storage box (9). Second connecting long plates (15) are fixedly connected to both the left and right sides of the first connecting long plate (10). The second connecting long plates (15) are slidably installed inside the second connecting slots (17). A limiting block (30) is fixedly connected to the side of the second connecting long plate (15) away from the first connecting long plate (10). The top of the limiting block (30) is fixedly installed on the bottom of the open storage box (9). The limiting block (30) is slidably installed inside the second limiting square slot (27).

4. A maintenance platform for a steam turbine cylinder in a power plant according to claim 1, 2 or 3, characterized in that: The second support component includes a connecting long rod (12), and the connecting long rod (12) is slidably installed inside the connecting square slot (18). A trapezoidal block (28) is fixedly connected to the bottom of the connecting long rod (12). The trapezoidal block (28) is slidably installed inside the trapezoidal slot (31).

5. A maintenance platform for a power plant steam turbine cylinder according to claim 1, 2 or 3, characterized in that: The first limiting component includes a supporting square plate (19), and the supporting square plate (19) is movably installed inside the first limiting square slot (14). One side of the supporting square plate (19) is fixedly installed on one side of the open storage box (9). A second screw rod (13) is threadedly connected inside the supporting square plate (19). The second screw rod (13) is threadedly connected to the second threaded slot (26).

6. A maintenance platform for a steam turbine cylinder in a power plant according to claim 1, 2 or 3, characterized in that: The cleaning component includes a support long rod (2), the left side of the support long rod (2) is fixedly installed on the right side of the first handle (3), the bottom of the support long rod (2) is fixedly connected with a scraping long plate (4) and two support vertical plates (23) respectively, the scraping long plate (4) is fixedly installed between the two support vertical plates (23), the bottoms of the two support vertical plates (23) are both fixedly connected with positioning long plates (29), and one side of the support vertical plate (23) away from the scraping long plate (4) is fixedly connected with an L-shaped rod (22).

7. The overhaul platform for the steam turbine cylinder of a power plant according to claim 5, wherein: The cleaning component includes a support long rod (2), the left side of the support long rod (2) is fixedly installed on the right side of the first handle (3), the bottom of the support long rod (2) is fixedly connected with a scraping long plate (4) and two support vertical plates (23) respectively, the scraping long plate (4) is fixedly installed between the two support vertical plates (23), the bottoms of the two support vertical plates (23) are both fixedly connected with positioning long plates (29), and one side of the support vertical plate (23) away from the scraping long plate (4) is fixedly connected with an L-shaped rod (22).

8. A maintenance platform for a steam turbine cylinder in a power plant according to claim 1, 2, 3 or 7, characterized in that: The third support component includes a support long plate (5), positioning long rods (6) are fixedly connected to the front and rear sides of the support long plate (5) and the front and rear sides of the maintenance platform main body (20) respectively. The positioning long rods (6) are slidably connected to the support vertical plate (23) and the L-shaped rod (22) respectively. The support long plate (5) and the maintenance platform main body (20) are both movably connected to the scraping long plate (4). The bottom of the positioning long rod (6) is fixedly connected with a convex long plate (8), and the convex long plate (8) is slidably installed inside the L-shaped rod (22). The top of the positioning long rod (6) is respectively provided with a first threaded groove (25) and a positioning long groove (7), and the positioning long plate (29) is slidably installed inside the positioning long groove (7).

9. The overhaul platform for a steam turbine cylinder of a power plant according to claim 6, wherein: The third support component includes a support long plate (5), positioning long rods (6) are fixedly connected to the front and rear sides of the support long plate (5) and the front and rear sides of the maintenance platform main body (20) respectively. The positioning long rods (6) are slidably connected to the support vertical plate (23) and the L-shaped rod (22) respectively. The support long plate (5) and the maintenance platform main body (20) are both movably connected to the scraping long plate (4). The bottom of the positioning long rod (6) is fixedly connected with a convex long plate (8), and the convex long plate (8) is slidably installed inside the L-shaped rod (22). The top of the positioning long rod (6) is respectively provided with a first threaded groove (25) and a positioning long groove (7), and the positioning long plate (29) is slidably installed inside the positioning long groove (7).

10. A maintenance platform for a steam turbine cylinder in a power plant according to claim 1, 2, 3, 7 or 9, characterized in that: The second limiting component includes a support vertical rod (21), the top of the support vertical rod (21) is fixedly installed on the bottom of the first handle (3), the right side of the support vertical rod (21) is fixedly installed on the left side of the support vertical plate (23), the support vertical rod (21) is slidably connected to the positioning long rod (6), a first screw rod (1) is commonly threadedly connected inside the support vertical rod (21) and inside the first handle (3), and the first screw rod (1) is threadedly connected to the first threaded groove (25).

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