Splicing and positioning structure for upper stoplog of power station boiler steel structure

Abstract

The utility model discloses an upper stoplog splicing and positioning structure of a power station boiler steel structure. The upper stoplog splicing and positioning structure comprises a stand column, a fixing plate I, an upper stoplog, a lower stoplog, a connecting plate I, a connecting plate II, a deviation rectifying mechanism I and a deviation rectifying mechanism II. A plurality of stand columns are transversely mounted, a fixing plate I is welded and mounted at the top ends of the stand columns, a plurality of groups of through holes are formed in the fixing plate I, and the positions of the through holes correspond to the through holes in the bottoms of the lower stoplog and the deviation rectifying mechanism I; the lower stoplog is fixedly installed on the fixing plate I through bolts and nuts, a connecting plate I and a connecting plate II are welded to the two sides of the lower stoplog, threaded holes are formed in the connecting plate I and the connecting plate II, and the threaded holes in the connecting plate I and the connecting plate II correspond to through holes in one side of the deviation rectifying mechanism II; the upper stoplog is located at the top of the lower stoplog, and the deviation rectifying mechanism I and the deviation rectifying mechanism II are located at two ends of the lower stoplog. According to the utility model, the accurate alignment of the upper stoplog and the lower stoplog is realized, the splicing requirements of the upper stoplog and the lower stoplog with different sizes and specifications can be met, and the mounting and the dismounting are convenient.

Description

Technical Field

[0001] The utility model belongs to the technical field of hoisting auxiliary equipment, and particularly relates to a splicing and positioning structure for superposed beams on the steel structure of a power station boiler. Background Technique

[0002] In the construction of thermal power plants, the hoisting and positioning of superposed beams on the steel structure of boilers are crucial. Traditional hoisting and positioning of superposed beams are often carried out through hoisting machines and some guiding mechanisms, resulting in poor installation accuracy. The superposed beams and the lower beams cannot be accurately aligned, and there is a lack of auxiliary deviation correction mechanisms. Once a position deviation occurs during hoisting, it is very difficult to make effective adjustments, and it is necessary to re-perform the hoisting operation, increasing the construction difficulty and time cost. It is difficult to adapt to the deviation situations of superposed beams of different sizes, resulting in reduced construction efficiency.

[0003] After retrieval: The prior art publication number: CN212532039U, a hoisting and positioning mechanism for superposed beams on the steel structure of a thermal power plant boiler, includes a superposed beam and a lower beam. The top of the superposed beam is fixedly connected to the bottom of the first fixed block, the top of the first fixed block is fixedly connected to both ends of the fixed hook, the two sides of the superposed beam are fixedly connected to the inner sides of the second fixed blocks, the bottom of the second fixed blocks is fixedly connected to the inner sides of the positioning blocks, and a positioning hole is provided in the middle of the positioning blocks. This prior art hoists the superposed beam to the top of the lower beam through a hoisting machine and then guides and installs the superposed beam through a guide rail. However, this prior art does not provide an auxiliary deviation correction mechanism. Once a position deviation occurs during hoisting, it is very difficult to make effective adjustments, and it is necessary to re-perform the hoisting operation, increasing the construction difficulty and time cost.

[0004] Further retrieval: The prior art publication number: CN115535874A, a hoisting and positioning mechanism for superposed beams on the steel structure of a thermal power plant boiler, includes a flat jib crane, and a wire winding device is installed on the flat jib crane, and a steel wire rope is connected to the wire winding device. Although this prior art is provided with an auxiliary deviation correction component, the deviation correction component cannot be adjusted in position, resulting in poor flexibility of the deviation correction component and reduced deviation correction effect. It is difficult to adapt to the deviation situations of superposed beams of different sizes, resulting in reduced construction efficiency. Summary of the Invention

[0005] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a splicing and positioning structure for superposed beams on the steel structure of a power station boiler, which not only realizes the accurate alignment of the superposed beam and the lower beam, but also can adapt to the splicing requirements of superposed beams and lower beams of different sizes and specifications, and is convenient for installation and disassembly.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A splicing and positioning structure for the upper superimposed beam of a power station boiler steel structure, comprising columns, fixing plate I, upper superimposed beam, lower superimposed beam, connecting plate I, connecting plate II, deviation rectifying mechanism I, and deviation rectifying mechanism II; A number of columns are provided and installed horizontally. The fixing plate I is welded and installed at the top of the columns. A number of groups of through holes are provided on the fixing plate I, and the positions of the through holes correspond to the bottom through holes of the lower superimposed beam and the deviation rectifying mechanism I for fixing the lower superimposed beam and the deviation rectifying mechanism I; The lower superimposed beam is fixedly installed on the fixing plate I through bolts and nuts. A number of groups of connecting plates I and connecting plates II are welded on both sides of the lower superimposed beam. Threaded holes are provided on the connecting plates I and connecting plates II, and the threaded holes on the connecting plates I and connecting plates II correspond to the through holes on one side of the deviation rectifying mechanism II, and the deviation rectifying mechanism II is fixed through bolts; The upper superimposed beam is located at the top of the lower superimposed beam, the deviation rectifying mechanism I and the deviation rectifying mechanism II are located at both ends of the lower superimposed beam. The deviation rectifying mechanism II is fixedly connected to the deviation rectifying mechanism I and the lower superimposed beam through bolts and nuts. The deviation rectifying mechanism I rectifies both ends of the upper and lower superimposed beams, and the deviation rectifying mechanism II rectifies both sides of the upper and lower superimposed beams.

[0008] The deviation rectifying mechanism I includes a fixed seat, a sliding seat I, a hydraulic jack II, and a top plate I; A number of groups of through holes are provided on the fixing plates I at both ends of the lower superimposed beam, and a number of groups of through holes are provided at the bottom of the fixed seat. The through holes on the fixing plate I correspond to the through holes at the bottom of the fixed seat; Sliding grooves are provided on both sides of the fixed seat, and both sides of the sliding seat I are arranged in the sliding grooves and are slidably connected to the fixed seat. A number of groups of hydraulic jacks I are provided at the bottom of the sliding seat I, and the hydraulic jacks I are installed on the fixed seat. The telescopic ends of the hydraulic jacks I correspond to the bottom of the sliding seat I; A number of groups of through holes are provided on the sliding seat I, and a number of groups of through holes are provided at different positions from top to bottom of the fixed seat. The through holes at different positions of the fixed seat correspond to the through holes on the sliding seat I to ensure that the sliding seat I can be fixed at different heights of the fixed seat; A number of groups of hydraulic jacks II are installed at one end of the sliding seat I, and the telescopic ends of the hydraulic jacks II are fixedly installed with the top plate I.

[0009] The correction mechanism II includes a sliding seat II, a sliding rod, a hydraulic jack III, a telescopic rod, a top plate II, a hydraulic jack IV, a fixed plate II, and a slide rail; through holes are provided on both sides of the fixed seat, and fixed plates II are installed on both sides of the fixed seat. Several groups of through holes are provided on one side of the fixed plate II, and the through holes on one side of the fixed plate II correspond to the through holes on one side of the fixed seat, the threaded holes on the connecting plate I and the connecting plate II; a slide rail is welded on the fixed plate II, and several groups of threaded holes are provided on the fixed plate II, and the multiple groups of threaded holes are arranged in sequence along the slide rail; the sliding seat II is provided with two groups of fixed plates II respectively slidably mounted on both sides of the fixed seat, and slidably connected to the slide rail, and the bottom of the sliding seat II is provided with a Through hole, the through hole at the bottom of the sliding seat II corresponds to the threaded hole on the fixed plate II; the hydraulic jack IV is provided with several horizontally installed on the fixed plate II, the telescopic end of the hydraulic jack IV corresponds to the sliding seat II, a sliding rod is fixedly installed between the two groups of sliding seats II, the top plate II is provided with two groups located between the two groups of sliding seats II and slidingly connected to the sliding rod, the hydraulic jack III is installed on one side of the sliding seat II, the telescopic end of the hydraulic jack III passes through the sliding seat II and is fixedly connected to the top plate II, the hydraulic jack III is located at the bottom of the sliding rod, the telescopic rod is installed on one side of the sliding seat II, the telescopic end of the telescopic rod passes through the sliding seat II and is fixedly connected to the top plate II, and the telescopic rod is located at the bottom of the hydraulic jack III.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] 1) Hydraulic jack I telescopes and pushes sliding seat I to move within the sliding groove of the fixed seat. After sliding seat I rises to the appropriate height, it is fixed to the fixed seat with bolts and nuts. Hydraulic jack IV pushes sliding seat II on fixed plate II for position adjustment. After sliding seat II is pushed to both sides of the upper stacked beam end, sliding seat II is fixed to fixed plate II with bolts. This allows for position adjustment according to upper and lower stacked beams of different sizes and specifications, ensuring the flexibility of correcting mechanisms I and II and preventing the correction effect of correcting mechanisms I and II from being reduced due to position restrictions.

[0012] 2) Hydraulic jack II on one side of sliding seat I pushes top plate I to correct the deviation of the upper and lower girders, ensuring precise alignment. Hydraulic jack III pushes top plate II against both sides of the upper girders to correct the deviation, ensuring accurate splicing of the upper and lower girders. Hydraulic jack II and hydraulic jack III correct the deviation of the upper girders at both ends and both sides, respectively, ensuring precise alignment of the upper and lower girders, effectively avoiding structural instability caused by deviation, thereby ensuring the firmness and safety of the splicing of the upper and lower girders and improving the stability and durability of the overall structure.

[0013] 3) The deviation rectifying mechanism I and the deviation rectifying mechanism II are both fixedly connected to the fixing plate I and the lower superposed beam through bolts and nuts. While ensuring the firmness and reliability of the deviation rectifying mechanism I and the deviation rectifying mechanism II, it is convenient for disassembly and installation, improving the construction efficiency and facilitating maintenance and adjustment; increasing the structural flexibility and versatility, being able to meet different construction requirements, and providing convenience for the splicing and positioning of the upper superposed beam. Brief Description of the Drawings

[0014] Appendix Figure 1 is a schematic structural diagram of a splicing and positioning structure of an upper superposed beam of a steel structure of a power station boiler in the present utility model;

[0015] Appendix Figure 2 is Figure 1 a schematic structural diagram of the fixing plate I in the appendix;

[0016] Appendix Figure 3 is Figure 1 a schematic structural diagram of the upper superposed beam in the appendix;

[0017] Appendix Figure 4 is Figure 1 a schematic structural diagram of the vertical deviation rectifying mechanism in the appendix;

[0018] Appendix Figure 5 is Figure 1 a schematic structural diagram of the horizontal deviation rectifying mechanism in the appendix;

[0019] Appendix Figure 6 is Figure 5 a schematic diagram of the connection mode of the fixing plate II in the appendix;

[0020] In the figure: 1, column; 2, fixing plate I; 3, upper superposed beam; 4, lower superposed beam; 401, connecting plate I; 402, connecting plate II; 5, deviation rectifying mechanism I; 51, fixed seat; 52, sliding seat I; 53, hydraulic jack I; 54, hydraulic jack II; 55, top plate I; 56, sliding groove; 6, deviation rectifying mechanism II; 61, sliding seat II; 62, sliding rod; 63, hydraulic jack III; 64, telescopic rod; 65, top plate II; 66, hydraulic jack IV; 67, fixing plate II; 68, slide rail. Detailed Embodiment

[0021] For the convenience of understanding by those skilled in the art, the technical solution of the present utility model will be further specifically described below in conjunction with the appendix Figure 1-6 , and make a further specific description of the technical solution of the present utility model.

[0022] A splicing and positioning structure for the upper laminated beam of a utility boiler steel structure, comprising columns 1, fixing plate I 2, upper laminated beam 3, lower laminated beam 4, connecting plate I 401, connecting plate II 402, deviation rectifying mechanism I 5, and deviation rectifying mechanism II 6; several columns 1 are provided and installed horizontally. The top of column 1 is welded with fixing plate I 2, and several groups of through holes are provided on fixing plate I 2, and the positions of the through holes correspond to the bottom through holes of lower laminated beam 4 and deviation rectifying mechanism I 5 for fixing the lower laminated beam and deviation rectifying mechanism I 5; the lower laminated beam 4 is fixedly installed on fixing plate I 2 of the top of column 1 through bolts and nuts. Several groups of connecting plate I 401 and connecting plate II 402 are welded on both sides of lower laminated beam 4. Threaded holes are provided on connecting plate I 401 and connecting plate II 402, and the threaded holes on connecting plate I 401 and connecting plate II 402 correspond to the through holes on one side of deviation rectifying mechanism II 6, and deviation rectifying mechanism II 6 is fixed through bolts; the upper laminated beam 3 is located on the top of the lower laminated beam 4, and deviation rectifying mechanism I 5 and deviation rectifying mechanism II 6 are located at both ends of the lower laminated beam 4. Deviation rectifying mechanism II 6 is fixedly connected to deviation rectifying mechanism I 5 and the lower laminated beam 4 through bolts and nuts. Deviation rectifying mechanism I 5 rectifies the two ends of the upper laminated beam 3 and the lower laminated beam 4, and deviation rectifying mechanism II 6 rectifies the two sides of the upper laminated beam 3 and the lower laminated beam 4.

[0023] As can be seen from the above description: when splicing the upper laminated beam 3 and the lower laminated beam 4, first fix the lower laminated beam 4 on the fixing plate I 2 at the top of column 1 through bolts and nuts; then, install the deviation rectifying mechanism I 5 and the deviation rectifying mechanism II 6 at both ends of the lower laminated beam 4 and fix them through bolts and nuts; subsequently, hoist the upper laminated beam 3 to the top of the lower laminated beam 4. The deviation rectifying mechanism II 6 rectifies and adjusts the two sides of the upper laminated beam 3, and the deviation rectifying mechanism I 5 rectifies and adjusts the two ends of the upper laminated beam 3 to accurately align the upper laminated beam 3 with the lower laminated beam 4; finally, use bolts and nuts to fix the upper laminated beam 3 and the lower laminated beam 4 together to complete the splicing and positioning process.

[0024] The deviation rectifying mechanism I 5 includes a fixed seat 51, a sliding seat I 52, a hydraulic jack II 54, and a top plate I 55; several groups of through holes are provided on the fixing plate I 2 at both ends of the lower laminated beam 4, and several groups of through holes are provided at the bottom of the fixed seat 51, and the through holes on the fixing plate I 2 correspond to the through holes at the bottom of the fixed seat 51; sliding grooves 56 are provided on both sides of the fixed seat 51, and both sides of the sliding seat I 52 are arranged in the sliding grooves 56 and slidably connected to the fixed seat 51. Several groups of hydraulic jacks I 53 are provided at the bottom of the sliding seat I 52, and the hydraulic jacks I 53 are installed on the fixed seat 51, and the telescopic ends of the hydraulic jacks I 53 correspond to the bottom of the sliding seat I 52; several groups of through holes are provided on the sliding seat I 52, and several groups of through holes are provided at different positions from top to bottom of the fixed seat 51, and the through holes at different positions of the fixed seat 51 correspond to the through holes on the sliding seat I 52 to ensure that the sliding seat I 52 can be fixed at different heights of the fixed seat 51; several groups of hydraulic jacks II 54 are installed at one end of the sliding seat I 52, and the telescopic ends of the hydraulic jacks II 54 are fixedly installed with the top plate I 55.

[0025] From the above description, it can be seen that: first, the fixing seat 51 is fixed to the two ends of the lower stack beam 4 by means of bolts and nuts through the bottom through-holes of the fixing seat 51 corresponding to the through-holes on the fixing plate I2; when the positions of the two ends of the upper stack beam 3 need to be adjusted, the hydraulic jack I53 is extended and retracted to push the sliding seat I52 to move in the sliding groove 56 of the fixing seat 51, and the sliding seat I52 is fixed to the fixing seat 51 by bolts and nuts after rising to a suitable height; then, the hydraulic jack II54 at one end of the sliding seat I52 pushes the top plate I55 to correct the deviation of the two ends of the upper and lower stack beams 3, 4, so that the two ends of the upper and lower stack beams 3 and 4 are accurately aligned.

[0026] The correcting mechanism II6 includes a sliding seat II61, a sliding rod 62, a hydraulic jack III63, a telescopic rod 64, a top plate II65, a hydraulic jack IV66, a fixed plate II67, and a slide rail 68; through holes are provided on both sides of the fixed seat 51, and fixed plates II67 are installed on both sides of the fixed seat 51. One side of the fixed plate II67 is provided with several groups of through holes, and the through holes on one side of the fixed plate II67 correspond to the through holes on one side of the fixed seat 51, the threaded holes on the connecting plate I401 and the connecting plate II402; a slide rail 68 is welded on the fixed plate II67, and several groups of threaded holes are provided on the fixed plate II67, and the multiple groups of threaded holes are arranged in sequence along the slide rail 68; the sliding seat II61 is provided with two groups of fixed plates II67 respectively slidably mounted on both sides of the fixed seat 51, and slidably connected to the slide rail 68, and the bottom of the sliding seat II61 The bottom of the sliding seat Ⅱ 61 is provided with a through hole, and the through hole at the bottom of the sliding seat Ⅱ 61 corresponds to the threaded hole on the fixed plate Ⅱ 67; the hydraulic jack IV 66 is provided with several horizontally installed on the fixed plate Ⅱ 67, the telescopic end of the hydraulic jack IV 66 corresponds to the sliding seat Ⅱ 61, and a sliding rod 62 is fixedly installed between the two groups of sliding seats Ⅱ 61. The top plate Ⅱ 65 is provided with two groups located between the two groups of sliding seats Ⅱ 61 and slidingly connected to the sliding rod 62. The hydraulic jack III 63 is installed on one side of the sliding seat Ⅱ 61, and the telescopic end of the hydraulic jack III 63 passes through the sliding seat Ⅱ 61 and is fixedly connected to the top plate Ⅱ 65. The hydraulic jack III 63 is located at the bottom of the sliding rod 62, and the telescopic rod 64 is installed on one side of the sliding seat Ⅱ 61. The telescopic end of the telescopic rod 64 passes through the sliding seat Ⅱ 61 and is fixedly connected to the top plate Ⅱ 65. The telescopic rod is located at the bottom of the hydraulic jack III 63.

[0027] From the above description, it can be seen that: first, the fixed plate II 67 is fixedly connected to the fixed seat 51 and the connecting plates I 401 and II 402 on both sides of the lower stop beam 4 by bolts and nuts; the hydraulic jack IV 66 pushes the sliding seat II 61 on the fixed plate II 67 to adjust its position, and after pushing the sliding seat II 61 to both sides of the end of the upper stop beam 3, the sliding seat II 61 and the fixed plate II 67 are fixed by bolts, and the hydraulic jack III 63 pushes the top plate II 65 to support both sides of the upper stop beam 3 to correct the deviation of both sides of the upper stop beam 3, and the telescopic rod 64 assists the top plate II 65 in adjusting its position to ensure that the upper stop beam 3 and the lower stop beam 4 are spliced accurately on both sides.

[0028] A splicing and positioning structure for the upper superimposed beam of a power station boiler steel structure, and the working process is as follows:

[0029] When splicing the upper superimposed beam 3 and the lower superimposed beam 4, first fix the lower superimposed beam 4 on the fixing plate I 2 at the top of the column 1 through bolts and nuts; then, install the deviation rectifying mechanism I 5 and the deviation rectifying mechanism II 6 at both ends of the lower superimposed beam 4, and fix and connect them through bolts and nuts; then, lift the upper superimposed beam 3 to the top of the lower superimposed beam 4, the deviation rectifying mechanism II 6 performs deviation rectifying adjustment on both sides of the upper superimposed beam 3, and the deviation rectifying mechanism I 5 performs deviation rectifying adjustment on both ends of the upper superimposed beam 3 to make the upper superimposed beam 3 and the lower superimposed beam 4 accurately aligned; finally, use bolts and nuts to fix the upper superimposed beam 3 and the lower superimposed beam 4 together to complete the splicing and positioning process.

[0030] In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0031] The above content is only an example and illustration of the structure of the present utility model. Those skilled in the art of this technology can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, as long as they do not deviate from the structure of the utility model or exceed the scope defined by this claim book, they should all fall within the protection scope of the present utility model.

Claims

1. A splicing and positioning structure for the upper superposed beam of a power station boiler steel structure, comprising columns, fixing plate I, upper superposed beam, lower superposed beam, connecting plate I, connecting plate II, deviation rectifying mechanism I, and deviation rectifying mechanism II; several columns are provided and installed horizontally. A fixing plate I is welded and installed at the top of the column. Several groups of through holes are provided on the fixing plate I, and the positions of the through holes correspond to the bottom through holes of the lower superposed beam and the deviation rectifying mechanism I; the lower superposed beam is fixedly installed on the fixing plate I through bolts and nuts. The upper superposed beam is located at the top of the lower superposed beam. The deviation rectifying mechanism I and the deviation rectifying mechanism II are located at both ends of the lower superposed beam. The deviation rectifying mechanism II is fixedly connected to the deviation rectifying mechanism I and the lower superposed beam through bolts and nuts. It is characterized in that The deviation rectifying mechanism I includes a fixed seat, sliding seat I, hydraulic jack II, and top plate I; several groups of through holes are provided on the fixing plate I at both ends of the lower superposed beam. Several groups of through holes are provided at the bottom of the fixed seat. The through holes on the fixing plate I correspond to the through holes at the bottom of the fixed seat; sliding grooves are provided on both sides of the fixed seat. Both sides of the sliding seat I are arranged in the sliding grooves and slidably connected to the fixed seat. Several groups of hydraulic jacks I are provided at the bottom of the sliding seat I, and the hydraulic jacks I are installed on the fixed seat. The telescopic ends of the hydraulic jacks I correspond to the bottom of the sliding seat I; several groups of through holes are provided on the sliding seat I. Several groups of through holes are provided at different positions from top to bottom on the fixed seat. The through holes at different positions on the fixed seat correspond to the through holes on the sliding seat I; several groups of hydraulic jacks II are installed at one end of the sliding seat I, and the telescopic ends of the hydraulic jacks II are fixedly installed with the top plate I. The deviation rectifying mechanism II includes a sliding seat II, sliding rod, hydraulic jack III, telescopic rod, top plate II, hydraulic jack IV, fixing plate II, and slide rail; through holes are provided on both sides of the fixed seat. Fixing plates II are installed on both sides of the fixed seat. Several groups of through holes are provided on one side of the fixing plate II. The through holes on one side of the fixing plate II correspond to the through holes on one side of the fixed seat, and the threaded holes on the connecting plate I and the connecting plate II; a slide rail is welded on the fixing plate II. Several groups of threaded holes are provided on the fixing plate II, and multiple groups of threaded holes are arranged in sequence along the slide rail; two groups of sliding seat II are provided and slidably installed on the fixing plates II on both sides of the fixed seat and slidably connected to the slide rail. A through hole is provided at the bottom of the sliding seat II, and the through hole at the bottom of the sliding seat II corresponds to the threaded hole on the fixing plate II; several hydraulic jacks IV are provided and installed horizontally on the fixing plate II. The telescopic ends of the hydraulic jacks IV correspond to the sliding seat II. A sliding rod is fixedly installed between the two groups of sliding seat II. Two groups of top plate II are provided between the two groups of sliding seat II and slidably connected to the sliding rod. The hydraulic jack III is installed on one side of the sliding seat II. The telescopic end of the hydraulic jack III passes through the sliding seat II and is fixedly connected to the top plate II. The hydraulic jack III is located at the bottom of the sliding rod.

2. The splicing and positioning structure of the upper superposed beam on the steel structure of a power station boiler according to claim 1, characterized in that Several groups of connecting plate I and connecting plate II are welded on both sides of the lower superposed beam. Threaded holes are provided on the connecting plate I and the connecting plate II, and the threaded holes on the connecting plate I and the connecting plate II correspond to the through holes on one side of the deviation rectifying mechanism II.

3. A splicing and positioning structure for the upper superimposed beam of a power station boiler steel structure according to claim 1, characterized in that The telescopic rod is installed on one side of the sliding seat II. The telescopic end of the telescopic rod passes through the sliding seat II and is fixedly connected to the top plate II. The telescopic rod is located at the bottom of the hydraulic jack III.

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