A balancing device and maintenance method suitable for hot air duct

Abstract

The present invention discloses a balancing device and maintenance method suitable for hot air ducts, wherein the balancing device comprises a horizontal pipe, a vertical pipe and an end pipe connecting the horizontal pipe and the vertical pipe, wherein a pipe compensator is installed between the end pipe and the horizontal pipe; a terminal pipe which is not connected to the vertical pipe is installed on the side of the vertical pipe away from the horizontal pipe, wherein the terminal pipe has a terminal compensator, and the horizontal pipe and the terminal pipe are connected by a tie rod, wherein the pipe compensator and the terminal compensator are both within the length range of the tie rod. The present application installs a pipe compensator between the end pipe and the horizontal pipe to absorb the expansion within the length range of the end pipe and the horizontal pipe, and installs a terminal compensator on the end pipe to absorb the expansion of the tie rod to ensure the balance of the hot air duct, wherein the device has a simple and compact structure, requires little investment, and is safe and reliable.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgical equipment, and in particular to a balancing device and a maintenance method suitable for hot air pipelines. Background Art

[0002] The hot blast furnace system is one of the important auxiliary systems in the blast furnace ironmaking process. The high-temperature hot air produced by the hot blast furnace is transported to the blast furnace through the hot blast pipe. The hot blast pipe is lined with bricks inside, and the pipe system is not allowed to deform significantly. In addition, the medium flow interface of the hot blast pipe is large, and the medium pressure is high. During production, the medium will generate huge internal pressure thrust at the end of the pipe and the part where the pipe direction changes, which is commonly known as the blind plate force. It can generally be as high as several hundred tons, especially in large blast furnaces. Therefore, the force balance of the hot blast pipe system is crucial to the safe and stable production of the hot blast pipe; therefore, it is necessary to reasonably design the hot blast pipe to match the high-temperature and high-pressure hot blast medium transportation.

[0003] The existing Chinese utility model patent with application number CN201120355650.X discloses a hot air duct tensioning device, which belongs to the technical field of mechanical equipment in the smelting industry. The technical scheme is: it includes a tie rod seat ring, a tie rod seat ring, a tie rod, a joint, a connecting shaft, and a tie rod. The two ends of the connecting shaft are respectively connected to the joints, and the joints are respectively connected to the tie rods. The other end of the tie rod is connected to the tie rod seat ring, and the other end of the tie rod is connected to the tie rod seat ring. The tie rod seat ring is arranged on the hot air branch pipe, and the tie rod seat ring is arranged on the hot air main pipe. The tie rod is arranged to offset the large blind plate force generated by the high-pressure hot air in the pipeline on the end of the pipeline.

[0004] However, the above solution only takes into account the expansion of the hot air duct, and cannot absorb the expansion of the tie rod itself. The tie rod seat ring is subjected to thrust, which in turn affects the force balance of the duct, resulting in the expansion of the hot air duct cannot be completely absorbed, posing a safety hazard.

[0005] In addition, the corrugated compensator on the hot air duct is prone to leakage and damage due to long-term exposure to wind and rain, expansion and contraction, and therefore needs to be repaired or replaced in time; currently, when replacing the corrugated compensator, it is generally necessary to remove the tie rod, and then dismantle and replace the corrugated compensator. Four tie rods made of round steel are generally used on the hot air duct. Each tie rod weighs several hundred kilograms, and the end of the tie rod is threadedly connected to the tie rod seat ring; during disassembly and assembly, due to the heavy tie rod, disassembly of the tie rod is time-consuming and laborious, and inconvenient for construction. Summary of the invention

[0006] The invention provides a balancing device suitable for a hot air duct and a maintenance method thereof. The device has a simple and compact structure, requires little investment, and is safe and reliable.

[0007] The technical problems to be solved are: 1. The above solution only takes into account the expansion of the hot air duct, and cannot absorb the expansion of the tie rod itself; 2. Removing the tie rod is time-consuming and labor-intensive, and is not convenient for maintenance and construction.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0009] The present invention discloses a balancing device suitable for a hot air duct, comprising a horizontal pipe, a vertical pipe and an end pipe connecting the horizontal pipe and the vertical pipe, wherein a duct compensator is installed between the end pipe and the horizontal pipe; a terminal pipe which is not connected to the vertical pipe is installed on a side of the vertical pipe away from the horizontal pipe, wherein the terminal pipe is provided with a terminal compensator, and the horizontal pipe and the terminal pipe are connected by a pull rod, and the duct compensator and the end compensator are both located within the length range of the pull rod.

[0010] By adopting the above scheme, the present application installs a pipeline compensator between the end pipe and the horizontal pipe to absorb the expansion within the length range of the end pipe and the horizontal pipe, and installs an end compensator on the end pipe to absorb the expansion of the pull rod to ensure the balance of the hot air pipe. The device has a simple and compact structure, low investment, and is safe and reliable.

[0011] The present invention provides a balancing device suitable for a hot air duct. Further, the terminal pipe and the horizontal pipe are coaxially arranged.

[0012] By adopting the above solution, the end compensator on the end pipe can easily absorb the expansion of the tie rod.

[0013] The present invention provides a balancing device suitable for a hot air duct. Furthermore, the terminal compensator has the same function as the duct compensator and is used to absorb the expansion of the pull rod.

[0014] The present invention provides a balancing device suitable for a hot air duct. Further, the terminal pipe is connected to a stamping pipe, and cold air is connected to the stamping pipe.

[0015] By adopting the above solution, the pressure balance on both sides of the vertical pipe is ensured.

[0016] The present invention provides a balancing device suitable for a hot air duct. Furthermore, a tie rod seat ring is installed on the terminal pipe, and the tie rod seat ring is located on the side of the terminal compensator away from the vertical pipe; a tie rod seat ring is installed on the horizontal pipe, and the tie rod seat ring is located on the side of the pipeline compensator away from the vertical pipe, and the tie rod is connected to the tie rod seat ring.

[0017] By adopting the above solution, the tie rod seat ring is used to install the tie rod, thereby ensuring the installation stability of the tie rod.

[0018] The present invention provides a balancing device suitable for a hot air duct. Furthermore, an annular groove is provided on the pull rod circumferentially on one side of the duct compensator close to the vertical pipe.

[0019] By adopting the above solution, the annular groove is used for subsequent removal of the pull rod.

[0020] The present invention provides a balancing device suitable for a hot air duct. Further, the depth of the annular groove is 5-10 mm.

[0021] By adopting the above solution, the use of subsequent maintenance work can be guaranteed without affecting the strength of the pull rod.

[0022] The present invention provides a maintenance method, comprising the following steps:

[0023] Step 1: When the pipe compensator is damaged and needs to be repaired, loosen the nut on the side of the tie rod close to the pipe compensator, so that the tie rod can slide on the tie rod seat ring along its axial direction away from the pipe compensator;

[0024] Step 2: Install a clamp assembly on the end tube. A roller is installed on the inner side of the clamp assembly, and the roller can slide along the end tube. The inner side of the clamp assembly has a slot for the pull rod to pass through. Insert the pull rod into the slot, and install a clamping block on the annular groove of the pull rod.

[0025] Step 3: Move the clamp assembly along the pull rod, and place the clamp block on the pull rod against the side of the clamp assembly close to the vertical pipe;

[0026] Step 4: Install the traction assembly between the clamp assembly and the tie rod seat ring on the end tube, pull the clamp assembly, and the clamp assembly drives the tie rod to move;

[0027] Step 5: After the end of the pull rod is out of the coverage of the pipeline compensator, stop pulling and remove and replace the pipeline compensator;

[0028] Step 6: After the new pipe compensator is installed, move the clamp assembly to the side of the clamp block close to the vertical pipe, and place the clamp block against the side of the clamp assembly away from the vertical pipe; install the traction assembly between the clamp assembly and the tie rod seat ring on the horizontal pipe, pull the clamp assembly, the clamp assembly drives the tie rod to move, and the tie rod is inserted into the tie rod seat ring. After it is in place, lock the tie rod and the tie rod seat ring with a nut.

[0029] By adopting the above scheme, the above maintenance method of the present application supports the pull rod in situ through the clamp assembly, and it is only necessary to move the pull rod a short distance, and remove the pull rod by using the cooperation of the roller and the hand winch, which is more labor-saving and convenient to operate; in addition, when resetting, due to the in-situ support of the pull rod, it is only necessary to pull the pull rod in the opposite direction without the need for re-positioning, which effectively improves the construction efficiency.

[0030] The present invention provides a maintenance method, further, the clamp assembly comprises two arc plate structures, the two arc plate structures are spliced ​​to form a multi-semicircle structure, the splicing end of the arc plate structure is provided with an outwardly convex connection block, and the two connection blocks are connected by bolts;

[0031] The inner side surface of the arc plate structure is provided with a slot along its thickness direction, the slot is used to pass the pull rod, and the slot and the pull rod are arranged coaxially; the roller is installed on the inner side surface of the arc plate structure, and two groups are arranged up and down along the arc plate structure.

[0032] The present invention provides a maintenance method, further, the traction assembly comprises a clamping unit for installation on the pull rod seat ring and a hand chain hoist connecting the clamping unit with the arc plate structure, the hand chain hoists are arranged in pairs and are respectively tied to the two arc plate structures;

[0033] The clamping unit includes a clamping block, which is provided with a clamping groove for buckling on the pull rod seat ring. The side wall of the clamping block is threadedly connected with a fastening bolt, which passes through the side wall of the clamping groove and is tightened on the pull rod seat ring; a hanging ring for hanging a hand winch is installed on the side wall on the other side of the clamping block.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. The present application installs a pipeline compensator between the end pipe and the horizontal pipe to absorb the expansion within the length range of the end pipe and the horizontal pipe, and installs an end compensator on the end pipe to absorb the expansion of the tie rod to ensure the balance of the hot air pipe. The device has a simple and compact structure, low investment, and is safe and reliable;

[0036] 2. The above maintenance method of the present application supports the tie rod in situ through the clamp assembly. It is only necessary to move the tie rod a short distance, and remove the tie rod by using the cooperation of the roller and the hand winch, which is more labor-saving and convenient to operate. In addition, when resetting, due to the in-situ support of the tie rod, it is only necessary to pull the tie rod in the opposite direction without the need for re-positioning, which effectively improves the construction efficiency.

[0037] The present invention will be further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural schematic diagram of the balancing device of the present invention;

[0039] Figure 2 This is a schematic diagram of the maintenance of the pipeline compensator of the present invention;

[0040] Figure 3 This is a schematic diagram of the structure of the clamp assembly of the present invention;

[0041] Figure 4This is a schematic diagram of the cooperation between the clamp assembly and the pull rod of the present invention;

[0042] Figure 5 This is a front view of the pull rod and the clamping block of the present invention;

[0043] Figure 6 It is a side view of the pull rod and the clamping block of the present invention;

[0044] Figure 7 It is a schematic diagram of the cooperation between the traction assembly and the draw rod seat ring of the present invention.

[0045] Reference numerals:

[0046] 1. End pipe; 1.1. Stamping pipe; 2. End compensator; 3. Tie rod; 4. Pipe compensator; 5. Tie rod seat ring; 6. Horizontal pipe; 7. End pipe; 8. Vertical pipe; 9. Clamp assembly; 9.1. Arc plate structure; 9.2. Connecting block; 9.3. Slot; 9.4. Roller; 10. Traction assembly; 10.1. Hand chain hoist; 10.2. Clamp block; 10.3. Clamp groove; 10.4. Fastening bolt; 10.5. Hanging ring; 11. Clamp block; 12. Annular groove. DETAILED DESCRIPTION

[0047] like Figure 1 As shown, the present invention discloses a balancing device and maintenance method suitable for a hot air duct, the balancing device comprises a horizontal pipe 6, a vertical pipe 8 and an end pipe 7 connecting the horizontal pipe 6 and the vertical pipe 8, a pipe compensator 4 is installed between the end pipe 7 and the horizontal pipe 6, the pipe compensator 4 can deform accordingly with the thermal expansion and contraction of the hot air duct to ensure the balance of the hot air duct; a terminal pipe 1 which is not connected to the vertical pipe 8 is installed on the side of the vertical pipe 8 away from the horizontal pipe 6, the terminal pipe 1, the horizontal pipe 6 and the end pipe 7 are coaxially arranged, the terminal pipe 1 is provided with a terminal compensator 2, the horizontal pipe 6 is connected to the terminal pipe 1 by a tie rod 3, four tie rods 3 are arranged at a certain interval along the circumference of the horizontal pipe 6, the pipe compensator 4 and the end compensator 2 are both located within the length range of the tie rod 3, and the end compensator 2 is used to absorb the expansion of the tie rod 3 to ensure the balance of the hot air duct.

[0048] The end compensator 2 has the same function as the pipeline compensator 4, and is used to absorb the expansion of the tie rod 3 to prevent the expansion of the tie rod 3 from affecting the hot air pipeline.

[0049] The terminal pipe 1 is connected to the stamping pipe 1.1, and the stamping pipe 1.1 is connected with cold air to ensure the pressure balance on both sides of the vertical pipe 8. In addition, there is no refractory material in the terminal pipe 1, which saves investment.

[0050] A tie rod seat ring 5 is installed on the terminal pipe 1, and the tie rod seat ring 5 is located on the side of the terminal compensator 2 away from the vertical pipe 8. A tie rod seat ring 5 is installed on the horizontal pipe 6, and the tie rod seat ring 5 is located on the side of the pipeline compensator 4 away from the vertical pipe 8. The tie rod 3 is locked and connected with the tie rod seat ring 5 by a nut.

[0051] An annular groove 12 is provided on the circumferential side of the tie rod 3 on the side of the pipeline compensator 4 close to the vertical pipe 8. The depth of the annular groove 12 is 5-10 mm, which can ensure the use of subsequent maintenance work without affecting the strength of the tie rod 3.

[0052] The present application installs a pipeline compensator 4 between the end pipe 7 and the horizontal pipe 6 to absorb the expansion within the length range of the end pipe 7 and the horizontal pipe 6, and installs an end compensator 2 on the end pipe 1 to absorb the expansion of the pull rod 3 to ensure the balance of the hot air duct. The device has a simple and compact structure, low investment, and is safe and reliable.

[0053] Reference Figure 2-Figure 7 , since the corrugated compensator on the hot air duct is exposed to wind and rain for a long time and expands and contracts, it is easy to leak and be damaged, so it needs to be repaired or replaced in time; currently, when the corrugated compensator is replaced, it cannot be directly removed due to the influence of the tie rod 3. Generally, the tie rod 3 needs to be removed, and then the corrugated compensator is disassembled and replaced. The hot air duct generally uses four tie rods 3 made of round steel, each of which weighs several hundred kilograms, and the end of the tie rod 3 is threadedly connected with the tie rod seat ring 5; during disassembly and assembly, due to the heavy weight of the tie rod 3, it is time-consuming and laborious to disassemble the tie rod 3, which is not convenient for construction; based on this, the present application also provides a maintenance method, including the following steps:

[0054] Step 1: When the pipe compensator 4 is damaged and needs to be repaired, loosen the nut on the tie rod 3 close to the pipe compensator 4, so that the tie rod 3 can slide on the tie rod seat ring 5 along its axial direction away from the pipe compensator 4.

[0055] Step 2: Install the clamp assembly 9 on the end tube 7, and install the clamping block 11 at the annular groove 12 of the pull rod 3. The clamping block 11 has a clamping groove, and the clamping block 11 is buckled in the annular groove 12 of the pull rod 3 through the clamping groove to connect the pull rod 3 to the clamping block 11.

[0056] The clamp assembly 9 includes two arc plate structures 9.1, and the two arc plate structures 9.1 are spliced ​​to form a multi-semicircular structure. The spliced ​​ends of the arc plate structures 9.1 are provided with a convex connecting block 9.2, and the two connecting blocks 9.2 are connected by bolts to achieve the connection and fixation of the arc plate structure 9.1; the inner side surface of the arc plate structure 9.1 is penetrated by a slot 9.3 along its thickness direction, and the opening position of the slot 9.3 corresponds to the position of the pull rod 3, which is used to pass the pull rod 3, and the slot 9.3 is coaxially arranged with the pull rod 3, and the size matches the size of the pull rod 3; two groups of rollers 9.4 are installed on the inner side surface of the arc plate structure 9.1, and the rollers 9.4 on the two arc plate structures 9.1 are symmetrically arranged, and the two groups of rollers 9.4 are alternately arranged with the slots 9.3. On the one hand, the rollers 9.4 are used to support the clamp assembly 9 to ensure the position of the clamp assembly 9, and on the other hand, as a pulley, the clamp assembly 9 can slide along the end tube 7 to facilitate the removal of the pull rod 3.

[0057] The two arc plate structures 9.1 are opened and spliced ​​from both sides of the end tube 7. During the splicing process, the pull rod 3 is passed through the slot 9.3, and the two arc plate structures 9.1 are connected by bolts; the clamp assembly 9 is moved along the pull rod 3, and the clamping block 11 on the pull rod 3 is pressed against the side of the arc plate structure 9.1 close to the vertical pipe 8.

[0058] Step 4: Install the traction assembly 10 between the clamp assembly 9 and the tie rod seat ring 5 of the terminal tube 1, and pull the clamp assembly 9, so that the clamp assembly 9 drives the tie rod 3 to move along its axial direction.

[0059] The traction assembly 10 comprises a clamping unit for mounting on the drawbar seat ring 5 and a hand chain hoist 10.1 for connecting the clamping unit to the arc plate structure 9.1. The hand chain hoists 10.1 are arranged in pairs and are respectively tied to two arc plate structures 9.1.

[0060] The clamping unit includes a clamping block 10.2, which is provided with a clamping groove 10.3 for buckling on the pull rod seat ring 5, and the side wall of the clamping block 10.2 is threadedly connected with a fastening bolt 10.4, which passes through the side wall of the clamping groove 10.3 and is pressed against the pull rod seat ring 5; a hanging ring 10.5 for hanging a hand winch 10.1 is installed on the other side of the clamping block 10.2, and a hook or hanging ring for connecting the hand winch 10.1 is also provided on the arc plate structure 9.1.

[0061] Step 5: After the end of the pull rod 3 is out of the coverage of the pipeline compensator 4, stop pulling and remove and replace the pipeline compensator 4.

[0062] Step 6: After the new pipe compensator 4 is installed, move the clamp assembly 9 to the side of the clamp block 11 close to the vertical pipe 8, and place the clamp block 11 against the side of the clamp assembly 9 away from the vertical pipe 8; install the traction assembly 10 between the clamp assembly 9 and the tie rod seat ring 5 on the horizontal pipe 6, and pull the clamp assembly 9. The clamp assembly 9 drives the tie rod 3 to move, and the tie rod 3 is inserted into the tie rod seat ring 5. After it is in place, the tie rod 3 and the tie rod seat ring 5 are locked by a nut.

[0063] When the tie rods 3 are removed, the number of tie rods that affect the installation of the pipeline compensator 4 can be removed as needed, and the clamping blocks 11 can be installed on the tie rods 3 that need to be removed.

[0064] Similarly, the installation of the end compensator 2 can also adopt the above method. The above maintenance method of the present application supports the tie rod 3 in situ through the clamp assembly 9. It is only necessary to move the tie rod 3 a short distance, and use the cooperation of the roller 9.4 and the hand winch 10.1 to remove the tie rod 3, which is more labor-saving and convenient to operate. In addition, when resetting, due to the in-situ support of the tie rod 3, it is only necessary to pull the tie rod 3 in the opposite direction without re-positioning, which effectively improves the construction efficiency.

[0065] The embodiments described above are merely descriptions of preferred implementation modes of the present invention and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A balancing device suitable for a hot air duct, comprising a horizontal pipe (6), a vertical pipe (8) and an end pipe (7) connecting the horizontal pipe (6) and the vertical pipe (8), characterized in that: A pipeline compensator (4) is installed between the end pipe (7) and the horizontal pipe (6); a terminal pipe (1) which is not connected to the vertical pipe (8) is installed on the side of the vertical pipe (8) away from the horizontal pipe (6), and the terminal pipe (1) has a terminal compensator (2). The horizontal pipe (6) and the terminal pipe (1) are connected by a tie rod (3), and the pipeline compensator (4) and the terminal compensator (2) are both located within the length range of the tie rod (3).

2. A balancing device suitable for hot air duct according to claim 1, characterized in that: The terminal tube (1) and the horizontal tube (6) are arranged coaxially.

3. A balancing device suitable for hot air duct according to claim 1, characterized in that: The end compensator (2) has the same function as the pipeline compensator (4), and is used to absorb the expansion of the tie rod (3).

4. A balancing device suitable for hot air duct according to claim 1, characterized in that: The terminal tube (1) is connected to the stamping tube (1.1), and cold air is connected to the stamping tube (1.1).

5. A balancing device suitable for hot air duct according to claim 1, characterized in that: The terminal pipe (1) is provided with a tie rod seat ring (5), and the tie rod seat ring (5) is located on the side of the terminal compensator (2) away from the vertical pipe (8); the horizontal pipe (6) is provided with a tie rod seat ring (5), and the tie rod seat ring (5) is located on the side of the pipeline compensator (4) away from the vertical pipe (8), and the tie rod (3) is connected to the tie rod seat ring (5).

6. A balancing device suitable for hot air duct according to claim 1, characterized in that: The pull rod (3) is provided with an annular groove (12) on one side of the pipeline compensator (4) close to the vertical pipe (8) in the circumferential direction.

7. A balancing device suitable for hot air duct according to claim 6, characterized in that: The depth of the annular groove (12) is 5-10 mm.

8. A maintenance method, comprising the balancing device for hot air ducts according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1: When the pipeline compensator (4) is damaged and needs to be repaired, loosen the nut on the side of the tie rod (3) close to the pipeline compensator (4) so ​​that the tie rod (3) can slide on the tie rod seat ring (5) along its axial direction away from the pipeline compensator (4); Step 2: Install a clamp assembly (9) on the end tube (7), a roller (9.4) is installed on the inner side of the clamp assembly (9), and the roller (9.4) can slide along the end tube (7); the inner side surface of the clamp assembly (9) has a slot (9.3) for the pull rod (3) to pass through, the pull rod (3) is inserted into the slot, and a clamping block (11) is installed at the annular groove (12) of the pull rod (3); Step 3: Move the clamp assembly (9) along the pull rod (3), and place the clamping block (11) on the pull rod (3) against the side of the clamp assembly (9) close to the vertical pipe (8); Step 4: Install the traction assembly (10) between the clamp assembly (9) and the tie rod seat ring (5) on the terminal tube (1), and pull the clamp assembly (9), so that the clamp assembly (9) drives the tie rod (3) to move; Step 5: After the end of the pull rod (3) is out of the coverage of the pipeline compensator (4), stop pulling and remove and replace the pipeline compensator (4); Step 6: After the new pipe compensator (4) is installed, move the clamp assembly (9) to the side of the clamp block (11) close to the vertical pipe (8), and place the clamp block (11) against the side of the clamp assembly (9) away from the vertical pipe (8); install the traction assembly (10) between the clamp assembly (9) and the tie rod seat ring (5) on the horizontal pipe (6), and pull the clamp assembly (9). The clamp assembly (9) drives the tie rod (3) to move, and the tie rod (3) is inserted into the tie rod seat ring (5). After it is in place, the tie rod (3) and the tie rod seat ring (5) are locked by a nut.

9. A maintenance method according to claim 8, characterized in that: The hoop assembly (9) comprises two arc plate structures (9.1), the two arc plate structures (9.1) are spliced ​​to form a multi-semicircular structure, the spliced ​​ends of the arc plate structures (9.1) are provided with outwardly protruding connection blocks (9.2), and the two connection blocks (9.2) are connected by bolts; The inner side surface of the arc plate structure (9.1) is provided with a slot (9.3) penetrating along the thickness direction thereof, the slot (9.3) is used to pass the pull rod (3), and the slot (9.3) and the pull rod (3) are arranged coaxially; the rollers (9.4) are installed on the inner side surface of the arc plate structure (9.1), and two groups are arranged up and down along the arc plate structure (9.1).

10. A maintenance method according to claim 8, characterized in that: The traction assembly (10) comprises a clamping unit for mounting on a pull rod seat ring (5) and a hand chain hoist (10.1) for connecting the clamping unit to the arc plate structure (9.1); the hand chain hoists (10.1) are arranged in pairs and are respectively connected to two arc plate structures (9.1); The clamping unit comprises a clamping block (10.2), the clamping block (10.2) is provided with a clamping groove (10.3) for buckling on the pull rod seat ring (5), the side wall of the clamping block (10.2) is threadedly connected with a fastening bolt (10.4), and the fastening bolt (10.4) passes through the side wall of the clamping groove (10.3) and is pressed against the pull rod seat ring (5); a hanging ring (10.5) for hanging a hand chain hoist (10.1) is installed on the side wall on the other side of the clamping block (10.2).

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