A jacking system, H-beam standard section tower crane and jacking method thereof

Abstract

The present invention discloses a jacking system, an H-beam standard section tower crane, and a jacking method thereof, which solve the technical problem of low automation level of the jacking system of the conventional H-beam standard section tower crane. The jacking system includes a first braking mechanism, a second braking mechanism, and a driving mechanism. The first braking mechanism is movably connected to the fixed jacking beam of the frame body, the second braking mechanism is movably connected to the movable jacking crossbeam, and the driving mechanism is connected to the fixed jacking beam of the frame body and the movable jacking crossbeam. The driving mechanism drives the first braking mechanism and the second braking mechanism to rise or fall by driving the fixed jacking beam of the frame body and the movable jacking crossbeam to rise or fall, and the first braking mechanism and the second braking mechanism are fixed to or separated from the steps on the H-beam main chord by the action of their own weight and / or tension. The jacking system adopts a semi-automatic braking method, and its automation level is improved compared with the braking method of the conventional H-beam standard section tower crane jacking system.

Description

Technical Field

[0001] The present invention relates to the technical field of cranes, and in particular to a jacking system, an H-shaped steel standard section tower crane and a jacking method thereof. Background Art

[0002] The jacking system is an important component in the process of adding and lowering sections of a tower crane. The brake of the jacking system is divided into two parts, the upper part is located at the fixed jacking beam of the frame body, and the lower part is located at the movable jacking beam. The braking of the jacking system of the traditional H-beam standard section tower crane adopts manual push-pull braking for both the upper and lower parts, which requires two people to operate and is quite laborious. In addition, during each jacking or lowering braking process, it is necessary to manually check whether the brake block is in place multiple times, and it is often necessary to adjust the oil cylinder to facilitate the pushing or pulling of the brake block. Once the brake block is not fully engaged in the standard section step, serious safety accidents are likely to occur. Therefore, there is an urgent need to improve the jacking system in the prior art. Summary of the Invention

[0003] One objective of the present invention is to provide a jacking system, an H-beam standard section tower crane, and a jacking method therefor, which address the technical issue of the low degree of automation associated with conventional H-beam standard section tower crane jacking systems. The various technical benefits of the preferred technical solution of the present invention are detailed below.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] The jacking system of the present invention includes a first braking mechanism, a second braking mechanism and a driving mechanism, wherein the first braking mechanism is movably connected to the fixed lifting beam of the frame body, the second braking mechanism is movably connected to the movable lifting beam, and the driving mechanism is connected to the fixed lifting beam of the frame body and the movable lifting beam. The driving mechanism drives the first braking mechanism and the second braking mechanism to rise or fall by driving the fixed lifting beam of the frame body and the movable lifting beam to rise or fall, and fixes or separates the first braking mechanism and the second braking mechanism from the steps on the H-shaped steel main chord through the action of their own weight and / or tension.

[0006] According to a preferred embodiment, the first braking mechanism includes a first brake block and a first handle, wherein one end of the first brake block is rotatably hinged to the fixed lifting beam of the frame body through a first pin shaft, and the other end of the first brake block is provided with a first clamping portion for clamping with the step; the first handle is provided on the first brake block.

[0007] According to a preferred embodiment, the first braking mechanism includes a second brake block, a second handle and a first counterweight block, wherein one end of the second brake block is rotatably hinged to the fixed lifting beam of the frame body through a second pin shaft, and the other end of the second brake block is provided with a second clamping portion for clamping with the step and the first counterweight block; the second handle is provided on the second brake block.

[0008] According to a preferred embodiment, the end of the second brake block away from one end of the second pin is an arc-shaped structure; and guide portions are provided inside the ends of the first clamping portion and the second clamping portion.

[0009] According to a preferred embodiment, the second braking mechanism includes a third brake block, a third handle and a second counterweight block, wherein the third brake block is rotatably hinged to the movable lifting beam through a third pin shaft, one end of the third brake block is provided with a third clamping portion for clamping with the step, the other end of the third brake block is provided with the second counterweight block, and the third handle is provided on the third brake block.

[0010] According to a preferred embodiment, a guide portion is provided on the inner side of the end portion of the third clamping portion.

[0011] According to a preferred embodiment, the second braking mechanism includes a fourth brake block, a fourth handle and a third counterweight block, wherein one end of the fourth brake block is rotatably hinged to the movable lifting beam through a fourth pin shaft, and the other end of the fourth brake block is provided with a fourth clamping portion for clamping with the step and the third counterweight block; the fourth handle is provided on the fourth brake block.

[0012] According to a preferred embodiment, the end of the fourth brake block away from one end of the fourth pin is an arc-shaped structure; and a guide portion is provided on the inner side of the end of the fourth clamping portion.

[0013] The H-beam standard section tower crane of the present invention comprises a tower body, an H-beam standard section, a sleeve, a movable jacking beam and a jacking system, wherein the jacking system is the jacking system described in any technical solution of the present invention, the sleeve is sleeved on the tower body, and the jacking system is arranged on the sleeve body fixed jacking beam and the movable jacking beam of the sleeve.

[0014] The jacking method of the H-beam standard section tower crane described in any technical solution of the present invention, wherein the section adding process comprises the following steps:

[0015] S101: Before the jacking system is activated, the third brake block or the fourth brake block is engaged with the step of the first H-beam standard section, and the first brake block or the second brake block is located between the steps of the second H-beam standard section and the third H-beam standard section and is in a free state;

[0016] S102: The driving mechanism extends, and the third brake block or the fourth brake block engages with the step of the first H-beam standard section and does not move; the driving mechanism drives the sleeve body to move upward, and the first brake block or the second brake block moves upward with the sleeve body, and the first brake block or the second brake block contacts the step of the third H-beam standard section and is forced to flip counterclockwise around the first pin shaft or the second pin shaft to pass over the step of the third H-beam standard section;

[0017] S103: After the first brake block or the second brake block passes over the step of the third H-beam standard section, it turns clockwise around the first pin or the second pin and returns to a free state. The driving mechanism extends to the stroke limit and stops extending.

[0018] S104: The driving mechanism begins to retract, and the third brake block or the fourth brake block engages with the step of the first H-beam standard section and does not move; the driving mechanism drives the sleeve body to move downward, and the first brake block or the second brake block moves downward with the sleeve body until the first brake block or the second brake block engages with the step of the third H-beam standard section;

[0019] S105: The driving mechanism continues to retract, and the first brake block or the second brake block engages with the step of the third H-beam standard section and does not move; the driving mechanism drives the movable lifting beam to move upward, and the third brake block or the fourth brake block moves upward with the movable lifting beam, and the third brake block or the fourth brake block disengages from the step of the first H-beam standard section until the third brake block or the fourth brake block moves upward to contact the step of the second H-beam standard section and is forced to flip counterclockwise around the third pin shaft or the fourth pin shaft to pass over the step of the second H-beam standard section;

[0020] S106: After the third brake pad or the fourth brake pad passes over the step of the second H-beam standard section, it turns clockwise around the third pin or the fourth pin and returns to a free state. The driving mechanism contracts to the stroke limit and stops contracting.

[0021] S107: The driving mechanism begins to extend, and the first brake block or the second brake block engages with the step of the third H-beam standard section and does not move; the driving mechanism drives the movable lifting beam downward, and the third brake block or the fourth brake block moves downward with the movable lifting beam until the third brake block or the fourth brake block engages with the step of the second H-beam standard section;

[0022] S108: The driving mechanism continues to extend until the third brake block or the fourth brake block is fully engaged with the step of the second H-beam standard section;

[0023] S109: The driving mechanism continues to extend, and the third brake block or the fourth brake block engages with the step of the second H-beam standard section and does not move; the driving mechanism drives the sleeve body to move upward, and the first brake block or the second brake block moves upward with the sleeve body until the first brake block or the second brake block disengages from the step of the third H-beam standard section;

[0024] Repeat steps S101 to S109 to start the next section adding process;

[0025] The lowering process of an H-beam standard section tower crane includes the following steps:

[0026] S201: Before the jacking system is activated, the third brake block or the fourth brake block is engaged with the step of the second H-beam standard section, and the first brake block or the second brake block is located above the third H-beam standard section and is in a free state;

[0027] S202: The driving mechanism begins to retract, and the third brake block or the fourth brake block engages with the step of the second H-beam standard section and does not move; the driving mechanism drives the sleeve body to move downward, and the first brake block or the second brake block moves downward with the sleeve body until the first brake block or the second brake block engages with the step of the third H-beam standard section;

[0028] S203: The driving mechanism continues to retract, the first brake block or the second brake block engages with the step of the third H-beam standard section and does not move; the driving mechanism drives the movable lifting beam to move upward, and the third brake block or the fourth brake block moves upward with the movable lifting beam until the third brake block or the fourth brake block disengages from the step of the second H-beam standard section, the driving mechanism retracts to the stroke limit, and the driving mechanism stops retracting;

[0029] S204: The first brake block or the second brake block is engaged with the step of the third H-beam standard section and does not move; the third brake block or the fourth brake block is pulled up and rotated counterclockwise around the third pin or the fourth pin and maintained in this state, the driving mechanism begins to extend, and the driving mechanism drives the movable lifting beam to move downward, and the third brake block or the fourth brake block moves downward with the movable lifting beam and passes over the step of the second H-beam standard section;

[0030] S205: After the third brake block or the fourth brake block passes over the step of the second H-beam standard section, the third brake block or the fourth brake block is released, and the third brake block or the fourth brake block rotates clockwise around the third pin shaft or the fourth pin shaft and returns to a free state.

[0031] S206: The driving mechanism continues to extend, and the first brake block or the second brake block engages with the step of the third H-beam standard section and does not move; the driving mechanism drives the movable lifting beam to move downward, and the third brake block or the fourth brake block moves downward with the movable lifting beam until the third brake block or the fourth brake block contacts with the step of the first H-beam standard section and slides into the step of the first H-beam standard section;

[0032] S207: The driving mechanism continues to extend, and the third brake block or the fourth brake block continues to move downward along with the movable lifting beam until the third brake block or the fourth brake block is fully engaged with the step of the first H-beam standard section;

[0033] S208: The driving mechanism continues to extend, and the third brake block or the fourth brake block engages with the step of the first H-beam standard section and does not move; the driving mechanism drives the sleeve body to move upward, and the first brake block or the second brake block moves upward with the sleeve body, and the first brake block or the second brake block disengages from the step of the third H-beam standard section, and the driving mechanism extends to the stroke limit, and the driving mechanism stops extending;

[0034] S209: The third brake block or the fourth brake block is engaged with the step of the first H-beam standard section and does not move; the first brake block or the second brake block is pulled up and the first brake block or the second brake block is turned counterclockwise around the first pin shaft or the second pin shaft and maintained in this state, the driving mechanism begins to retract, and the driving mechanism drives the sleeve body to move downward, and the first brake block or the second brake block moves downward with the sleeve body until the first brake block or the second brake block moves downward and passes over the step of the third H-beam standard section;

[0035] S210: After the first brake block or the second brake block passes downward over the step of the third H-beam standard section, the first brake block or the second brake block is released, and the first brake block or the second brake block flips clockwise around the first pin shaft or the second pin shaft and returns to a free state;

[0036] S211: The driving mechanism continues to retract, and the third brake block or the fourth brake block engages with the step of the first H-beam standard section and does not move; the driving mechanism drives the sleeve body to move downward, and the first brake block or the second brake block moves downward with the sleeve body until the first brake block or the second brake block engages with the step of the second H-beam standard section;

[0037] S212: The driving mechanism continues to retract, the first brake block or the second brake block engages with the step of the second H-beam standard section and does not move; the driving mechanism drives the movable lifting beam upward, the third brake block or the fourth brake block moves upward with the movable lifting beam and disengages from the step of the first H-beam standard section, the driving mechanism retracts to the stroke limit, and the driving mechanism stops retracting;

[0038] Repeat steps S201 to S212 to start the next step-down process.

[0039] The jacking system, H-beam standard section tower crane and jacking method provided by the present invention have at least the following beneficial technical effects:

[0040] The jacking system, H-beam standard section tower crane and jacking method thereof of the present invention are as follows: when the jacking system needs to work, the first brake mechanism and / or the second brake mechanism are fixed to the steps on the H-beam main chord; when not working, the first brake mechanism and / or the second brake mechanism are separated from the steps on the H-beam main chord, forming a safe distance from the steps; during the section adding process, no manual operation is required; during the section lowering process, only the first brake mechanism and the second brake mechanism need to be manually pulled to rotate to avoid jamming between the first brake mechanism and the second brake mechanism and the steps; that is, the jacking system of the present invention is a semi-automatic braking method, and its degree of automation is improved compared with the braking method of the traditional H-beam standard section tower crane jacking system.

[0041] That is, the jacking system, H-beam standard section tower crane and jacking method thereof of the present invention solve the technical problem of low automation level of the jacking system of the traditional H-beam standard section tower crane. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0043] Figure 1 is a schematic diagram of the first brake pad of the present invention in a free state;

[0044] Figure 2 is a schematic diagram of the second brake pad of the present invention in a free state;

[0045] Figure 3 is a schematic diagram of the first brake pad of the present invention in a state of being tilted up under force;

[0046] Figure 4 is a schematic diagram of the second brake pad of the present invention in a state of being tilted up under force;

[0047] Figure 5 is a schematic diagram of the first brake pad of the present invention in a pulled-up state;

[0048] Figure 6 is a schematic diagram of the second brake pad of the present invention in a pulled-up state;

[0049] Figure 7is a schematic diagram of the first brake pad of the present invention in a state of falling back under its own weight;

[0050] Figure 8 is a schematic diagram of the second brake pad of the present invention in a state of falling back under its own weight;

[0051] Figure 9 is a schematic diagram of the first brake pad of the present invention in a working state;

[0052] Figure 10 is a schematic diagram of the second brake pad of the present invention in a working state;

[0053] Figure 11 is a schematic diagram of the third brake pad of the present invention in a free state;

[0054] Figure 12 is a schematic diagram of the fourth brake pad of the present invention in a free state;

[0055] Figure 13 is a schematic diagram of the third brake pad of the present invention sliding into the step;

[0056] Figure 14 is a schematic diagram of the fourth brake pad of the present invention sliding into the step;

[0057] Figure 15 is a schematic diagram of the third brake pad of the present invention in operation;

[0058] Figure 16 is a schematic diagram of the fourth brake pad of the present invention in a working state;

[0059] Figure 17 is a schematic diagram of the third brake pad of the present invention in a state of automatic flipping under force;

[0060] Figure 18 is a schematic diagram of the fourth brake pad of the present invention in a state of automatic flipping under force;

[0061] Figure 19 is a schematic diagram of the third brake pad of the present invention in an automatically falling state;

[0062] Figure 20 is a schematic diagram of the fourth brake pad of the present invention in an automatically falling state;

[0063] Figure 21 is a schematic diagram of the third brake pad of the present invention in a pulled-up state;

[0064] Figure 22 is a schematic diagram of the fourth brake pad of the present invention in a pulled-up state;

[0065] Figure 23 It is a schematic diagram of the installation of the driving device of the present invention;

[0066] Figure 23a yes Figure 23 Schematic diagram of local AA;

[0067] Figure 23b It is a first schematic diagram of the connection between the driving device and the movable lifting beam;

[0068] Figure 23c is a second schematic diagram of the connection between the drive device and the movable lifting beam;

[0069] Figure 24 Schematic diagram of a preferred embodiment of step S101 in the jacking method of the present invention;

[0070] Figure 25 Schematic diagram of a preferred embodiment of step S102 in the jacking method of the present invention;

[0071] Figure 26 Schematic diagram of a preferred embodiment of step S103 in the jacking method of the present invention;

[0072] Figure 27 Schematic diagram of a preferred embodiment of step S104 in the jacking method of the present invention;

[0073] Figure 28 Schematic diagram of a preferred embodiment of step S105 in the jacking method of the present invention;

[0074] Figure 29 Schematic diagram of a preferred embodiment of step S106 in the jacking method of the present invention;

[0075] Figure 30 Schematic diagram of a preferred embodiment of step S107 in the jacking method of the present invention;

[0076] Figure 31 Schematic diagram of a preferred embodiment of step S108 in the jacking method of the present invention;

[0077] Figure 32 Schematic diagram of a preferred embodiment of step S109 in the jacking method of the present invention;

[0078] Figure 33 It is a schematic diagram of a preferred implementation of step S202 in the jacking method of the present invention.

[0079] In the figure: 10, sleeve body; 11, sleeve body fixed lifting beam; 12, movable lifting beam; 13, first H-beam standard section; 131, H-beam main chord; 131a, step; 14, second H-beam standard section; 15, third H-beam standard section; 20, drive mechanism; 201, first hinge point; 202, second hinge point; 211, first brake block; 211a, first clamping portion; 212, first handle; 213, first A pin shaft; 221, a second brake block; 221a, a second clamping portion; 222, a second handle; 223, a first counterweight; 224, a second pin shaft; 231, a third brake block; 231a, a third clamping portion; 232, a third handle; 233, a second counterweight; 234, a third pin shaft; 241, a fourth brake block; 241a, a fourth clamping portion; 242, a fourth handle; 243, a third counterweight; 244, a fourth pin shaft. DETAILED DESCRIPTION

[0080] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0081] The following is attached with the instruction manual Figures 1 to 33 And embodiments 1 to 3 describe in detail the jacking system, H-beam standard section tower crane and jacking method of the present invention.

[0082] Example 1

[0083] This embodiment describes the jacking system of the present invention.

[0084] The jacking system of this embodiment includes a first braking mechanism, a second braking mechanism and a driving mechanism 20, wherein the first braking mechanism is movably connected to the fixed lifting beam 11 of the frame body, the second braking mechanism is movably connected to the movable lifting beam 12, and the driving mechanism 20 is connected to the fixed lifting beam 11 of the frame body and the movable lifting beam 12. The driving mechanism 20 drives the first braking mechanism and the second braking mechanism to rise or fall by driving the fixed lifting beam 11 of the frame body and the movable lifting beam 12 to rise or fall, and fixes or separates the first braking mechanism and the second braking mechanism from the step 131a on the H-shaped steel main chord 131 through the action of deadweight and / or tension. Preferably, the driving mechanism 20 is an oil cylinder. More preferably, one end of the driving mechanism 20 is connected to the fixed lifting beam 11 of the frame body on the frame body 10 through a first hinge point 201, and the other end of the driving mechanism 20 is connected to the movable lifting beam 12 through a second hinge point 202, as shown in FIG. Figure 23 、 Figures 23a to 23cThe jacking system of this embodiment adopts a semi-automatic braking mode, which has a higher degree of automation than the braking mode of the traditional H-beam standard section tower crane jacking system.

[0085] According to a preferred embodiment, the first braking mechanism includes a first braking block 211 and a first handle 212. Figure 1 As shown. One end of the first brake block 211 is rotatably hinged to the frame body fixed lifting beam 11 via a first pin 213. The other end of the first brake block 211 is provided with a first clamping portion 211a for clamping with the step 131a; a first handle 212 is provided on the first brake block 211. Preferably, a guide portion is provided on the inner side of the end of the first clamping portion 211a. In the preferred technical solution of this embodiment, a guide portion is provided on the inner side of the end of the first clamping portion 211a to facilitate the first clamping portion 211a to slide into and clamp with the step 131a. Preferably, the first brake block 211 is a U-shaped structure, and the rotatable hinge point of the first brake block 211 and the frame body fixed lifting beam 11 is located at one end of the U-shaped structure, so that the center of gravity of the first brake block 211 is not in a straight line with the first pin 213, so that the first brake block 211 can automatically flip back under the action of its own gravity.

[0086] According to a preferred embodiment, the first braking mechanism includes a second braking block 221, a second handle 222 and a first counterweight block 223. Figure 2 As shown. One end of the second brake block 221 is rotatably hinged to the frame body fixed lifting beam 11 through the second pin shaft 224, and the other end of the second brake block 221 is provided with a second clamping portion 221a and a first counterweight block 223 for clamping with the step 131a; the second handle 222 is provided on the second brake block 221. Preferably, a guide portion is provided on the inner side of the end of the second clamping portion 221a. In the preferred technical solution of this embodiment, a guide portion is provided on the inner side of the end of the second clamping portion 221a, so that the second clamping portion 221a can slide in and clamp with the step 131a. Preferably, the end of the second brake block 221 away from the second pin shaft 224 is an arc-shaped structure. In the preferred technical solution of this embodiment, the end of the second brake block 221 away from the second pin shaft 224 is an arc-shaped structure, which can avoid the problem of the second brake block 221 getting stuck when it contacts the web of the H-beam standard section during rotation. The second brake block 221 of the preferred technical solution of this embodiment is a plate-shaped structure. One end of the second brake block 221 is rotatably hinged to the lifting beam 11 fixed to the frame body through a second pin shaft 224, and the other end is provided with a first counterweight block 223, which can make the center of gravity of the second brake block 221 not in a straight line with the second pin shaft 224, so that the second brake block 221 can automatically flip and fall under the action of its own gravity and the gravity of the first counterweight block 223.

[0087] The first brake block 211 or the second brake block 221 of the first brake mechanism of the preferred technical solution of this embodiment has five states. Specifically, the first brake block 211 or the second brake block 221 is in a free state, that is, the first brake block 211 or the second brake block 221 is in a free state above the step 131a, such as Figure 1 or Figure 2 The first brake block 211 or the second brake block 221 is in a state of being flipped up by force, that is, the first brake block 211 or the second brake block 221 is in contact with the step 131a and is subjected to an extrusion force when flipped, as shown Figure 3 or Figure 4 The first brake block 211 or the second brake block 221 is in the pulled state, that is, pulling the first handle 212 or the second handle 222, so that the first brake block 211 or the second brake block 221 is forced to flip the state, as shown Figure 5 or Figure 6 As shown; the first brake block 211 or the second brake block 221 is in a state of falling back by its own weight, that is, when the external force disappears, the first brake block 211 or the second brake block 221 automatically falls back to a free state under its own gravity or its own gravity and the gravity of the first counterweight 223, as Figure 7 or Figure 8 The first brake block 211 or the second brake block 221 is in working condition, that is, the first brake block 211 or the second brake block 221 is completely fixed with the step 131a, as shown Figure 9 or Figure 10 shown.

[0088] According to a preferred embodiment, the second braking mechanism includes a third braking block 231, a third handle 232 and a second counterweight block 233. Figure 11 As shown. The third brake block 231 is rotatably hinged to the movable lifting beam 12 via a third pin 234. One end of the third brake block 231 is provided with a third clamping portion 231a for clamping with the step 131a. The other end of the third brake block 231 is provided with a second counterweight 233. A third handle 232 is provided on the third brake block 231. Preferably, a guide portion is provided on the inner side of the end of the third clamping portion 231a. The preferred technical solution of this embodiment is provided with a guide portion on the inner side of the end of the third clamping portion 231a to facilitate the third clamping portion 231a to slide into and clamp with the step 131a. Preferably, the middle part of the third brake block 231 is hinged to the movable lifting beam 12, and the second counterweight block 233 and the third clamping portion 231a are respectively located on both sides of the third pin shaft 234, so that the center of gravity of the third brake block 231 and the third pin shaft 234 are not in a straight line, so that the third brake block 231 can automatically flip over and fall back under the action of its own gravity and the second counterweight block 233.

[0089] According to a preferred embodiment, the second braking mechanism includes a fourth braking block 241, a fourth handle 242 and a third counterweight block 243. Figure 12 As shown. One end of the fourth brake block 241 is rotatably hinged to the movable lifting beam 12 through the fourth pin 244, and the other end of the fourth brake block 241 is provided with a fourth clamping portion 241a and a third counterweight 243 for clamping with the step 131a; the fourth handle 242 is provided on the fourth brake block 241. Preferably, a guide portion is provided on the inner side of the end of the fourth clamping portion 241a. In the preferred technical solution of this embodiment, a guide portion is provided on the inner side of the end of the fourth clamping portion 241a, so as to facilitate the fourth clamping portion 241a to slide in and clamp with the step 131a. Preferably, the end of the fourth brake block 241 away from the fourth pin 244 is an arc-shaped structure; in the preferred technical solution of this embodiment, the end of the fourth brake block 241 away from the fourth pin 244 is an arc-shaped structure, which can avoid the problem of the fourth brake block 241 getting stuck when it contacts the web of the H-shaped steel standard section during rotation. The fourth brake block 241 of the preferred technical solution of this embodiment is a plate-shaped structure. One end of the fourth brake block 241 is rotatably hinged to the movable lifting beam 12 through the fourth pin shaft 244, and the other end is provided with a third counterweight block 243, which can make the center of gravity of the fourth brake block 241 not in a straight line with the fourth pin shaft 244, so that the fourth brake block 241 can automatically flip over and fall back under the action of its own gravity and the gravity of the third counterweight block 243.

[0090] The third brake block 231 or the fourth brake block 241 of the second brake mechanism of the preferred technical solution of this embodiment has six states. Specifically, the third brake block 231 or the fourth brake block 241 is in a free state, that is, the third brake block 231 or the fourth brake block 241 is in a free state above the step 131a, such as Figure 11 or Figure 12 The third brake block 231 or the fourth brake block 241 slides into the state of the step 131a, that is, the third brake block 231 or the fourth brake block 241 moves downward and begins to slide into the step 131a and engage therewith, as Figure 13 or Figure 14 The third brake block 231 or the fourth brake block 241 is in working condition, that is, the third brake block 231 or the fourth brake block 241 is completely fixed with the step 131a, as shown Figure 15 or Figure 16 The third brake block 231 or the fourth brake block 241 is in a state of automatic flipping under force, that is, the third brake block 231 or the fourth brake block 241 is automatically flipped under the extrusion force when in contact with the step 131a, as shown Figure 17 or Figure 18As shown; the third brake block 231 or the fourth brake block 241 is in an automatic fall back state, that is, when the external force disappears, the third brake block 231 or the fourth brake block 241 automatically falls back to a free state under the action of its own gravity counterweight, as Figure 19 or Figure 20 The third brake block 231 or the fourth brake block 241 is in the pulled state, that is, the third handle 232 or the fourth handle 242 is pulled, so that the third brake block 231 or the fourth brake block 241 is forced to flip and form a safe distance from the step 131a, as shown Figure 21 or Figure 22 shown.

[0091] The first brake mechanism of this embodiment is connected to the fixed lifting beam 11 of the sleeve body via a first pin 213 or a second pin 224. When in operation, the first brake block 211 or the second brake block 221 can be fully engaged with the step 131a due to its own weight. When not in operation, the first brake block 211 or the second brake block 221 is pulled up to form a safe distance from the step 131a. The second brake mechanism of this embodiment is connected to the movable lifting beam 12 via a third pin 234 or a fourth pin 244. The third brake block 231 or the fourth brake block 241 can be directly engaged with the step 131a due to its own weight. When in operation, the third brake block 231 or the fourth brake block 241 can be directly engaged with the step 131a. When not in operation, the third brake block 231 or the fourth brake block 241 is pulled up to form a safe distance from the step 131a. The safe distance in this embodiment refers to the distance at which the brake block will not get stuck with the step 131a.

[0092] Example 2

[0093] This embodiment describes the H-beam standard section tower crane of the present invention.

[0094] The H-beam standard section tower crane of this embodiment includes a tower body, an H-beam standard section, a sleeve, a movable jacking beam 12, and a jacking system. The jacking system is the jacking system of any of the technical solutions in Example 1. The sleeve is sleeved onto the tower body, and the jacking system is installed on the sleeve body's fixed jacking beam 11 and movable jacking beam 12.

[0095] The H-beam standard section tower crane of this embodiment utilizes the semi-automatic braking method of the jacking system of any of the technical solutions in Example 1 to perform the section addition and subtraction process. This improves the degree of automation compared to the braking method of the jacking system of a conventional H-beam standard section tower crane. Furthermore, in this embodiment of the H-beam standard section tower crane, the step 131a of the H-beam standard section can also be considered a reinforcing rib. This integrated design of the step 131a and the reinforcing rib effectively streamlines the structure of the H-beam standard section.

[0096] Example 3

[0097] This embodiment describes the jacking method of the H-beam standard section tower crane in Example 2.

[0098] The lifting method of the H-beam standard section tower crane in this embodiment includes two processes: adding sections and lowering sections. Specifically, the installed standard section of the H-beam standard section tower crane is connected to the ground and is in a fixed state. The frame body 10 is sleeved on the installed standard section, and the weight of the frame body 10 is fixed to the step 131a of the standard section through the brake blocks of the first brake mechanism and the second brake mechanism. During the process of adding sections and lowering sections of the H-beam standard section tower crane, there is a process of mutual movement between the frame body 10 and the standard section, which is manifested in the frame body 10 climbing up and down on the standard section through the first brake mechanism and the second brake mechanism. During operation, only one of the brake blocks of the first brake mechanism and the second brake mechanism is fixed to the step 131a of the standard section, subjected to force and in a working state, while the other is in an active state. For example, when the brake block of the first brake mechanism is fixed on the frame body 10, the brake block of the second brake mechanism is in an active state on the frame body 10. As the cylinder extends or shortens, the brake block of the second brake mechanism moves vertically with the cylinder, and its relative position with the frame body 10 changes.

[0099] Preferably, the section adding process of the H-beam standard section tower crane includes the following steps:

[0100] S101: Before the jacking system is activated, the third brake block 231 or the fourth brake block 241 is engaged with the step 131a of the first H-beam standard section 13, and the first brake block 211 or the second brake block 221 is located between the step 131a of the second H-beam standard section 14 and the third H-beam standard section 15 and is in a free state. Figure 24 As shown;

[0101] S102: The driving mechanism 20 extends, and the third brake block 231 or the fourth brake block 241 engages with the step 131a of the first H-beam standard section 13 and does not move; the driving mechanism 20 drives the frame body 10 to move upward, and the first brake block 211 or the second brake block 221 moves upward with the frame, and the first brake block 211 or the second brake block 221 contacts the step 131a of the third H-beam standard section 15 and is forced to rotate counterclockwise around the first pin 213 or the second pin 224 and pass over the step 131a of the third H-beam standard section 15, as shown in FIG. Figure 25 As shown;

[0102] S103: After the first brake block 211 or the second brake block 221 passes over the step 131a of the third H-beam standard section 15, it turns clockwise around the first pin 213 or the second pin 224 and returns to a free state. The driving mechanism 20 extends to the stroke limit and stops extending. Figure 26 As shown;

[0103] S104: The driving mechanism 20 begins to retract, and the third brake block 231 or the fourth brake block 241 engages with the step 131a of the first H-beam standard section 13 and does not move; the driving mechanism 20 drives the frame body 10 to move downward, and the first brake block 211 or the second brake block 221 moves downward with the frame until the first brake block 211 or the second brake block 221 engages with the step 131a of the third H-beam standard section 15. Figure 27 As shown;

[0104] S105: The driving mechanism 20 continues to contract, and the first brake block 211 or the second brake block 221 is engaged with the step 131a of the third H-beam standard section 15 and does not move; the driving mechanism 20 drives the movable lifting beam 12 to move upward, and the third brake block 231 or the fourth brake block 241 moves upward with the movable lifting beam 12, and the third brake block 231 or the fourth brake block 241 is disengaged from the step 131a of the first H-beam standard section 13, until the third brake block 231 or the fourth brake block 241 moves upward to contact the step 131a of the second H-beam standard section 14 and is forced to flip counterclockwise around the third pin 234 or the fourth pin 244 to pass over the step 131a of the second H-beam standard section 14, as shown in FIG. Figure 28 As shown;

[0105] S106: After the third brake block 231 or the fourth brake block 241 passes over the step 131a of the second H-beam standard section 14, it turns clockwise around the third pin 234 or the fourth pin 244 and returns to a free state. The driving mechanism 20 contracts to the stroke limit and stops contracting. Figure 29 As shown;

[0106] S107: The driving mechanism 20 begins to extend, and the first brake block 211 or the second brake block 221 engages with the step 131a of the third H-beam standard section 15 and does not move; the driving mechanism 20 drives the movable lifting beam 12 to move downward, and the third brake block 231 or the fourth brake block 241 moves downward with the movable lifting beam 12 until the third brake block 231 or the fourth brake block 241 engages with the step 131a of the second H-beam standard section 14. Figure 30 As shown;

[0107] S108: The driving mechanism 20 continues to extend until the third brake block 231 or the fourth brake block 241 is completely engaged with the step 131a of the second H-beam standard section 14. Figure 31 As shown;

[0108] S109: The driving mechanism 20 continues to extend, and the third brake block 231 or the fourth brake block 241 engages with the step 131a of the second H-beam standard section 14 and does not move; the driving mechanism 20 drives the frame body 10 to move upward, and the first brake block 211 or the second brake block 221 moves upward with the frame until the first brake block 211 or the second brake block 221 disengages from the step 131a of the third H-beam standard section 15. Figure 32 As shown;

[0109] Repeat steps S101 to S109 to start the next section adding process.

[0110] Preferably, the section lowering process of the H-beam standard section tower crane includes the following steps:

[0111] S201: Before the jacking system is activated, the third brake block 231 or the fourth brake block 241 is engaged with the step 131a of the second H-beam standard section 14, and the first brake block 211 or the second brake block 221 is located above the third H-beam standard section 15 and is in a free state;

[0112] S202: The driving mechanism 20 begins to retract, and the third brake block 231 or the fourth brake block 241 engages with the step 131a of the second H-beam standard section 14 and does not move; the driving mechanism 20 drives the frame body 10 to move downward, and the first brake block 211 or the second brake block 221 moves downward with the frame until the first brake block 211 or the second brake block 221 engages with the step 131a of the third H-beam standard section 15, as shown in FIG. Figure 33 As shown;

[0113] S203: The driving mechanism 20 continues to retract, and the first brake block 211 or the second brake block 221 engages with the step 131a of the third H-beam standard section 15 and does not move. The driving mechanism 20 drives the movable lifting beam 12 to move upward, and the third brake block 231 or the fourth brake block 241 moves upward with the movable lifting beam 12 until the third brake block 231 or the fourth brake block 241 disengages from the step 131a of the second H-beam standard section 14. The driving mechanism 20 retracts to the travel limit and stops retracting.

[0114] S204: The first brake block 211 or the second brake block 221 is engaged with the step 131a of the third H-beam standard section 15 and does not move; the third brake block 231 or the fourth brake block 241 is pulled up and flipped counterclockwise around the third pin 234 or the fourth pin 244 and maintained in this state, and the driving mechanism 20 begins to extend, driving the movable lifting beam 12 downward, and the third brake block 231 or the fourth brake block 241 moves downward with the movable lifting beam 12 and passes over the step 131a of the second H-beam standard section 14;

[0115] S205: After the third brake block 231 or the fourth brake block 241 passes over the step 131a of the second H-beam standard section 14, the third brake block 231 or the fourth brake block 241 is released, and the third brake block 231 or the fourth brake block 241 rotates clockwise around the third pin 234 or the fourth pin 244 and returns to a free state.

[0116] S206: The driving mechanism 20 continues to extend, and the first brake block 211 or the second brake block 221 engages with the step 131a of the third H-beam standard section 15 and does not move. The driving mechanism 20 drives the movable lifting beam 12 to move downward, and the third brake block 231 or the fourth brake block 241 moves downward with the movable lifting beam 12 until the third brake block 231 or the fourth brake block 241 contacts the step 131a of the first H-beam standard section 13 and slides into the step 131a of the first H-beam standard section 13.

[0117] S207: The driving mechanism 20 continues to extend, and the third brake block 231 or the fourth brake block 241 continues to move downward along with the movable lifting beam 12 until the third brake block 231 or the fourth brake block 241 is fully engaged with the step 131a of the first H-beam standard section 13;

[0118] S208: The driving mechanism 20 continues to extend, and the third brake block 231 or the fourth brake block 241 engages with the step 131a of the first H-beam standard section 13 and does not move; the driving mechanism 20 drives the frame body 10 to move upward, and the first brake block 211 or the second brake block 221 moves upward with the frame body, and the first brake block 211 or the second brake block 221 disengages from the step 131a of the third H-beam standard section 15, and the driving mechanism 20 extends to the stroke limit, and the driving mechanism 20 stops extending;

[0119] S209: The third brake block 231 or the fourth brake block 241 is engaged with the step 131a of the first H-beam standard section 13 and does not move; the first brake block 211 or the second brake block 221 is pulled up and the first brake block 211 or the second brake block 221 is turned counterclockwise around the first pin 213 or the second pin 224 and maintained in this state, and the driving mechanism 20 begins to contract, and the driving mechanism 20 drives the sleeve body 10 to move downward, and the first brake block 211 or the second brake block 221 moves downward with the sleeve body until the first brake block 211 or the second brake block 221 moves downward and passes over the step 131a of the third H-beam standard section 15;

[0120] S210: After the first brake block 211 or the second brake block 221 passes downward over the step 131a of the third H-beam standard section 15, the first brake block 211 or the second brake block 221 is released, and the first brake block 211 or the second brake block 221 turns clockwise around the first pin 213 or the second pin 224 and returns to a free state;

[0121] S211: The driving mechanism 20 continues to retract, and the third brake block 231 or the fourth brake block 241 engages with the step 131a of the first H-beam standard section 13 and does not move. The driving mechanism 20 drives the frame body 10 to move downward, and the first brake block 211 or the second brake block 221 moves downward with the frame body until the first brake block 211 or the second brake block 221 engages with the step 131a of the second H-beam standard section 14.

[0122] S212: The driving mechanism 20 continues to retract, and the first brake block 211 or the second brake block 221 engages with the step 131a of the second H-beam standard section 14 and does not move. The driving mechanism 20 drives the movable lifting beam 12 to move upward, and the third brake block 231 or the fourth brake block 241 moves upward with the movable lifting beam 12 and disengages from the step 131a of the first H-beam standard section 13. The driving mechanism 20 retracts to the travel limit and stops retracting.

[0123] Repeat steps S201 to S212 to start the next step-down process.

[0124] The jacking method of the present invention does not require manual operation during the section adding process, and during the section lowering process, it is only necessary to manually pull the first brake mechanism and the second brake mechanism to rotate to avoid jamming between the first brake mechanism and the second brake mechanism and the step 131a, thereby realizing a semi-automatic braking method. Compared with the braking method of the traditional H-beam standard section tower crane jacking system, its degree of automation is improved.

[0125] In the description of the present invention, it should be noted that, unless otherwise specified, "plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0126] It should also be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention depending on the specific circumstances.

[0127] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An H-beam standard section tower crane, characterized in that: It comprises a tower body, an H-shaped steel standard section, a sleeve, a movable jacking beam (12) and a jacking system, wherein the sleeve is sleeved on the tower body, and the jacking system is arranged on the sleeve body fixed jacking beam (11) and the movable jacking beam (12) of the sleeve; The jacking system comprises a first braking mechanism, a second braking mechanism and a driving mechanism (20), wherein the first braking mechanism is movably connected to the fixed jacking beam (11) of the frame body, the second braking mechanism is movably connected to the movable jacking beam (12), the driving mechanism (20) is connected to the fixed jacking beam (11) of the frame body and the movable jacking beam (12), and the driving mechanism (20) drives the first braking mechanism and the second braking mechanism to rise or fall by driving the fixed jacking beam (11) of the frame body and the movable jacking beam (12) to rise or fall, and makes the first braking mechanism and the second braking mechanism fixed to or separated from the step (131a) on the H-shaped steel main chord (131) by the action of their own weight and / or tension; The first braking mechanism includes a first brake block (211) or a second brake block (221); the second braking mechanism includes a third brake block (231) or a fourth brake block (241); The process of adding sections to an H-beam standard section tower crane includes the following steps: S101: Before the jacking system is activated, the third brake block (231) or the fourth brake block (241) is engaged with the step (131a) of the first H-beam standard section (13), and the first brake block (211) or the second brake block (221) is located between the step (131a) of the second H-beam standard section (14) and the third H-beam standard section (15) and is in a free state; S102: the driving mechanism (20) is extended, the third brake block (231) or the fourth brake block (241) is engaged with the step (131a) of the first H-beam standard section (13) and does not move; the driving mechanism (20) drives the sleeve body (10) to move upward, the first brake block (211) or the second brake block (221) moves upward with the sleeve body, and the first brake block (211) or the second brake block (221) contacts the step (131a) of the third H-beam standard section (15) and is forced to rotate counterclockwise around the first pin shaft (213) or the second pin shaft (224) to pass over the step (131a) of the third H-beam standard section (15); S103: After the first brake block (211) or the second brake block (221) passes over the step (131a) of the third H-beam standard section (15), it turns clockwise around the first pin (213) or the second pin (224) and returns to a free state, the driving mechanism (20) extends to the stroke limit, and the driving mechanism (20) stops extending; S104: the driving mechanism (20) starts to retract, the third brake block (231) or the fourth brake block (241) engages with the step (131a) of the first H-beam standard section (13) and does not move; the driving mechanism (20) drives the sleeve body (10) to move downward, and the first brake block (211) or the second brake block (221) moves downward with the sleeve body until the first brake block (211) or the second brake block (221) engages with the step (131a) of the third H-beam standard section (15); S105: the driving mechanism (20) continues to retract, the first brake block (211) or the second brake block (221) engages with the step (131a) of the third H-beam standard section (15) and does not move; the driving mechanism (20) drives the movable lifting beam (12) to move upward, the third brake block (231) or the fourth brake block (241) moves upward with the movable lifting beam (12), and the third brake block (231) or the fourth brake block (241) disengages from the step (131a) of the first H-beam standard section (13) until the third brake block (231) or the fourth brake block (241) moves upward to contact the step (131a) of the second H-beam standard section (14) and is forced to turn counterclockwise around the third pin (234) or the fourth pin (244) to pass over the step (131a) of the second H-beam standard section (14); S106: After the third brake block (231) or the fourth brake block (241) passes over the step (131a) of the second H-beam standard section (14), it turns clockwise around the third pin (234) or the fourth pin (244) and returns to a free state, and the driving mechanism (20) contracts to the stroke limit, and the driving mechanism (20) stops contracting; S107: The driving mechanism (20) begins to extend, and the first brake block (211) or the second brake block (221) engages with the step (131a) of the third H-beam standard section (15) and does not move; the driving mechanism (20) drives the movable lifting beam (12) to move downward, and the third brake block (231) or the fourth brake block (241) moves downward with the movable lifting beam (12) until the third brake block (231) or the fourth brake block (241) engages with the step (131a) of the second H-beam standard section (14); S108: The driving mechanism (20) continues to extend until the third brake block (231) or the fourth brake block (241) is completely engaged with the step (131a) of the second H-beam standard section (14); S109: the driving mechanism (20) continues to extend, the third brake block (231) or the fourth brake block (241) engages with the step (131a) of the second H-beam standard section (14) and does not move; the driving mechanism (20) drives the sleeve body (10) to move upward, and the first brake block (211) or the second brake block (221) moves upward with the sleeve body until the first brake block (211) or the second brake block (221) disengages from the step (131a) of the third H-beam standard section (15); Repeat steps S101 to S109 to start the next section adding process.

2. The H-beam standard section tower crane according to claim 1, characterized in that: The first brake mechanism includes a first brake block (211) and a first handle (212), wherein one end of the first brake block (211) is rotatably hinged to the fixed lifting beam (11) of the sleeve body via a first pin shaft (213), and the other end of the first brake block (211) is provided with a first clamping portion (211a) for clamping with the step (131a); the first handle (212) is provided on the first brake block (211).

3. The H-beam standard section tower crane according to claim 1, characterized in that: The first brake mechanism includes a second brake block (221), a second handle (222) and a first counterweight block (223), wherein one end of the second brake block (221) is rotatably hinged to the fixed lifting beam (11) of the sleeve body through a second pin shaft (224), and the other end of the second brake block (221) is provided with a second clamping portion (221a) for clamping with the step (131a) and the first counterweight block (223); the second handle (222) is provided on the second brake block (221).

4. The H-beam standard section tower crane according to claim 2 or 3, characterized in that: The end of the second brake block (221) away from one end of the second pin shaft (224) is an arc-shaped structure; guide portions are provided on the inner sides of the ends of the first clamping portion (211a) and the second clamping portion (221a).

5. The H-beam standard section tower crane according to any one of claims 1 to 3, characterized in that: The second braking mechanism includes a third brake block (231), a third handle (232) and a second counterweight block (233), wherein the third brake block (231) and the movable lifting beam (12) are rotatably hinged via a third pin shaft (234), one end of the third brake block (231) is provided with a third clamping portion (231a) for clamping with the step (131a), the other end of the third brake block (231) is provided with the second counterweight block (233), and the third handle (232) is provided on the third brake block (231).

6. The H-beam standard section tower crane according to claim 5, characterized in that: A guide portion is provided on the inner side of the end portion of the third clamping portion (231a).

7. The H-beam standard section tower crane according to any one of claims 1 to 3, characterized in that: The second braking mechanism includes a fourth brake block (241), a fourth handle (242) and a third counterweight block (243), wherein one end of the fourth brake block (241) is rotatably hinged to the movable lifting beam (12) via a fourth pin shaft (244), and the other end of the fourth brake block (241) is provided with a fourth clamping portion (241a) for clamping with the step (131a) and the third counterweight block (243); the fourth handle (242) is provided on the fourth brake block (241).

8. The H-beam standard section tower crane according to claim 7, characterized in that: The end of the fourth brake block (241) away from one end of the fourth pin shaft (244) is an arc-shaped structure; a guide portion is provided on the inner side of the end of the fourth clamping portion (241a).

9. The method for lifting an H-beam standard section tower crane according to any one of claims 1 to 8, characterized in that: The lowering process of an H-beam standard section tower crane includes the following steps: S201: Before the jacking system is activated, the third brake block (231) or the fourth brake block (241) is engaged with the step (131a) of the second H-beam standard section (14), and the first brake block (211) or the second brake block (221) is located above the third H-beam standard section (15) and is in a free state; S202: the driving mechanism (20) starts to retract, the third brake block (231) or the fourth brake block (241) engages with the step (131a) of the second H-beam standard section (14) and does not move; the driving mechanism (20) drives the sleeve body (10) to move downward, and the first brake block (211) or the second brake block (221) moves downward with the sleeve body until the first brake block (211) or the second brake block (221) engages with the step (131a) of the third H-beam standard section (15); S203: the driving mechanism (20) continues to retract, the first brake block (211) or the second brake block (221) engages with the step (131a) of the third H-beam standard section (15) and does not move; the driving mechanism (20) drives the movable lifting beam (12) to move upward, and the third brake block (231) or the fourth brake block (241) moves upward along with the movable lifting beam (12) until the third brake block (231) or the fourth brake block (241) disengages from the step (131a) of the second H-beam standard section (14), the driving mechanism (20) retracts to the stroke limit, and the driving mechanism (20) stops retracting; S204: The first brake block (211) or the second brake block (221) is engaged with the step (131a) of the third H-beam standard section (15) and does not move; the third brake block (231) or the fourth brake block (241) is pulled up and the third brake block (231) or the fourth brake block (241) is turned counterclockwise around the third pin (234) or the fourth pin (244) and maintained in this state, the driving mechanism (20) begins to extend, and the driving mechanism (20) drives the movable lifting beam (12) to move downward, and the third brake block (231) or the fourth brake block (241) moves downward with the movable lifting beam (12) and passes over the step (131a) of the second H-beam standard section (14); S205: After the third brake block (231) or the fourth brake block (241) passes over the step (131a) of the second H-beam standard section (14), the third brake block (231) or the fourth brake block (241) is released, and the third brake block (231) or the fourth brake block (241) rotates clockwise around the third pin (234) or the fourth pin (244) and returns to a free state. S206: the driving mechanism (20) continues to extend, the first brake block (211) or the second brake block (221) engages with the step (131a) of the third H-beam standard section (15) and does not move; the driving mechanism (20) drives the movable lifting beam (12) to move downward, and the third brake block (231) or the fourth brake block (241) moves downward with the movable lifting beam (12) until the third brake block (231) or the fourth brake block (241) contacts with the step (131a) of the first H-beam standard section (13) and slides into the step (131a) of the first H-beam standard section (13); S207: The driving mechanism (20) continues to extend, and the third brake block (231) or the fourth brake block (241) continues to move downward along with the movable lifting beam (12) until the third brake block (231) or the fourth brake block (241) is completely engaged with the step (131a) of the first H-beam standard section (13); S208: the driving mechanism (20) continues to extend, the third brake block (231) or the fourth brake block (241) engages with the step (131a) of the first H-beam standard section (13) and does not move; the driving mechanism (20) drives the sleeve body (10) to move upward, the first brake block (211) or the second brake block (221) moves upward with the sleeve body, and the first brake block (211) or the second brake block (221) disengages from the step (131a) of the third H-beam standard section (15), the driving mechanism (20) extends to the stroke limit, and the driving mechanism (20) stops extending; S209: The third brake block (231) or the fourth brake block (241) is engaged with the step (131a) of the first H-beam standard section (13) and does not move; the first brake block (211) or the second brake block (221) is pulled up and the first brake block (211) or the second brake block (221) is turned counterclockwise around the first pin shaft (213) or the second pin shaft (224) and maintained in this state, the driving mechanism (20) starts to contract, and the driving mechanism (20) drives the sleeve body (10) to move downward, and the first brake block (211) or the second brake block (221) moves downward with the sleeve until the first brake block (211) or the second brake block (221) moves downward and passes over the step (131a) of the third H-beam standard section (15); S210: After the first brake block (211) or the second brake block (221) passes downward over the step (131a) of the third H-beam standard section (15), the first brake block (211) or the second brake block (221) is released, and the first brake block (211) or the second brake block (221) turns clockwise around the first pin shaft (213) or the second pin shaft (224) and returns to a free state; S211: the driving mechanism (20) continues to retract, the third brake block (231) or the fourth brake block (241) engages with the step (131a) of the first H-beam standard section (13) and does not move; the driving mechanism (20) drives the sleeve body (10) to move downward, and the first brake block (211) or the second brake block (221) moves downward with the sleeve body until the first brake block (211) or the second brake block (221) engages with the step (131a) of the second H-beam standard section (14); S212: the driving mechanism (20) continues to retract, the first brake block (211) or the second brake block (221) engages with the step (131a) of the second H-beam standard section (14) and does not move; the driving mechanism (20) drives the movable lifting beam (12) to move upward, the third brake block (231) or the fourth brake block (241) moves upward with the movable lifting beam (12) and disengages from the step (131a) of the first H-beam standard section (13), the driving mechanism (20) retracts to the stroke limit, and the driving mechanism (20) stops retracting; Repeat steps S201 to S212 to start the next step-down process.

Images