A block assembly type pier body turnover and steam curing shed

Abstract

The application relates to a block assembly type pier body turnover steam curing shed, and belongs to the technical field of concrete member manufacturing. The steam curing shed comprises a frame body sleeved on a pier body. The frame body comprises multiple groups of splicing parts. The outer peripheries of the multiple groups of splicing parts are respectively provided with sealing tarpaulins. The multiple groups of sealing tarpaulins and the pier body form a steam curing space. A steam generating assembly is arranged on the frame body. The steam generating assembly is provided with a steam transmission pipeline for transmitting steam. Adjacent splicing parts are movably connected. Adjacent splicing parts have an activity space. A flexible sealing pipe is arranged in the activity space in the vertical direction. The bottom end of the flexible sealing pipe is communicated with the bottom of the steam curing space. The top end of the flexible sealing pipe extends downward after penetrating through the sealing tarpaulin and is communicated with the bottom of the steam curing space. A pressurizing pipe is arranged in the flexible sealing pipe. The top end of the pressurizing pipe penetrates through the flexible sealing pipe and is communicated with the steam transmission pipeline. The application has the technical effects of prolonging the service life of the steam curing shed and reducing the influence of temperature change on the sealing performance of the steam curing shed.

Description

Technical Field

[0001] The present application relates to the technical field of concrete component manufacturing, and in particular to a block-assembled pier body turnover and steaming shed. Background Art

[0002] Rollover formwork is a formwork technique commonly used in concrete construction, particularly for tall structures (such as chimneys, bridge piers, and silos) or vertical or inclined structures that require continuous pouring. Its core principle is to achieve efficient and continuous construction by pouring concrete in layers and then cyclically raising the formwork system.

[0003] Bridge piers are cast from concrete, a mixture containing cement. Therefore, they require post-cast curing. The pier construction height is high, making it impractical to use conventional floor-standing curing sheds. If a curing shed were to move with the formwork, the shed's installation, disassembly, and fixing methods would significantly restrict on-site construction efficiency. Furthermore, during the curing process, the shed's tarpaulin and frame will repeatedly expand and contract due to temperature fluctuations, temporarily widening the gaps that were once tightly fitted. The frame expands at a rate of approximately 0.012% / °C after heating. For a 50°C temperature difference, a 1-meter-long frame can stretch by approximately 6mm. This can easily reduce the sealing of the frame's joints, and the mutual compression of the frame structure significantly reduces the curing shed's service life.

[0004] Chinese patent application No. 202411535911.4 discloses an assembled steaming hood for prefabricated piers, comprising an assembled steaming hood and an intelligent temperature control system base. The intelligent temperature control system base is installed on the prefabricated pier base. The assembled steaming hood adopts an assemblable design. Multiple assembled steaming hoods are spliced ​​in sequence according to the length of the pier and installed on the intelligent temperature control system base to form a kiln body that seals the pier. Steam pipes and water spray pipes are installed on the intelligent temperature control system base. Water pipes corresponding to the steam pipes and water spray pipes are installed in the assembled steaming hood. The water pipes are connected to nozzles. Temperature and humidity probes are also installed in the assembled steaming hood. The temperature and humidity probes feed back the signals in the kiln to the maintenance system host through a data cable. The maintenance system host sends a control signal to the intelligent temperature control system base to control the opening / closing of the solenoid valves in the steam pipe and the water spray pipe. The above patent lays the steaming shed on the pier by splicing multiple sections together. However, the joints of the spliced ​​steaming shed will repeatedly expand or contract with temperature changes, causing the originally tightly fitted gap to temporarily expand, thereby reducing the sealing of the steaming shed.

[0005] Regarding the above-mentioned related technologies, there is a defect that the gap at the joint of the steaming shed, which was originally tightly fitted, is temporarily enlarged due to temperature changes, thereby reducing the sealing performance of the steaming shed. Summary of the Invention

[0006] In order to solve the above technical problems, the present application provides a block-assembled pier body turnover and steaming shed.

[0007] The present application provides a block-assembly pier body turning mold steaming shed, which adopts the following technical solutions:

[0008] and a tube connecting the discharging opening of the steaming tray and the feeding tube of the steaming tray. The tube connecting the discharging opening of the steaming tray and the feeding tube of the steaming tray are connected with the tube connecting the discharging opening of the steaming tray and the feeding tube of the steaming tray.

[0009] By adopting the above technical solution, multiple splicing parts are spliced ​​into a frame around the pier body, and sealing tarpaulins are respectively set on the splicing parts in advance, so that the pier body can be sealed around after the multiple splicing parts are spliced ​​into the frame, which greatly improves the installation efficiency of the steaming shed; by movably connecting the multiple splicing parts, hard extrusion between the splicing parts due to temperature changes is prevented, and the service life of the frame is greatly improved; by arranging a flexible sealing tube in the activity space, and connecting the flexible sealing tube and the bottom of the steaming space to each other, especially by arranging a pressurized tube in the flexible sealing tube, and connecting the pressurized tube with the steam transmission pipeline, the steam generating component is used as the power, and the accumulated water generated in the steaming space is fully utilized to flexibly seal the activity space.

[0010] Preferably, the steam generating assembly includes a water tank, a steam generator and a steam eruption pipeline; the water tank is connected to the steam generator; the steam generator is connected to the steam eruption pipeline through the steam transmission pipeline; and the steam eruption pipeline is arranged on the frame.

[0011] Preferably, a flexible drainage guide rod is coaxially provided in the flexible sealing tube.

[0012] By adopting the above technical solution, the flexible guide rod guides the water flow, so that the accumulated water at the bottom of the steaming space is smoothly absorbed into the flexible sealed tube; the flexible guide rod can also play a supporting role, so that the flexible sealed tube can smoothly transfer the accumulated water and prevent the flexible sealed tube from drying out when the pressure tube suddenly provides suction.

[0013] Preferably, a flexible sealing sleeve is provided in the pressurized tube; a receiving cavity is provided inside the flexible sealing sleeve; and water is contained in the receiving cavity.

[0014] By adopting the above technical solution, when the steam temperature in the steam transmission pipeline increases, the moisture in the accommodating cavity is partially vaporized, causing the volume of the flexible sealing sleeve to increase, thereby allowing the flexible sealing sleeve to seal the pressurized pipe; after the pressurized pipe is sealed, the water in the return pipe and multiple groups of flexible sealing pipes flows to the bottom of the steaming space, so that the width of the flexible sealing pipe can automatically change according to the width of the activity space, thereby improving the flexibility of the flexible sealing pipe.

[0015] Preferably, adjacent splicing parts are connected by a first bolt and a nut; an elastic member is connected between the head of the first bolt and the splicing part; and the elastic member is used to provide a force to move the first bolt away from the splicing part.

[0016] Preferably, the tops of the multiple groups of flexible sealing tubes are connected to the bottom of the steaming space through a return pipe; one end of the pressurized tube extends into the return pipe, and the other end is connected to the steam transmission pipeline.

[0017] By adopting the above technical solution, since the tops of the multiple groups of flexible sealed tubes are connected to the bottom of the steaming space through the return pipe, only one group of pressurized pipes needs to be set up, which improves the installation speed of the equipment, reduces the overall volume of the equipment, and avoids the generation of complex pipelines after the multiple groups of flexible sealed tubes extend downward.

[0018] Preferably, the bottoms of the multiple groups of sealed tarpaulins are respectively connected to flexible water storage tanks; the bottoms of the flexible sealing tubes are communicated with the interior of the flexible water storage tanks; and the return pipe is communicated with the interior of any of the flexible water storage tanks.

[0019] By adopting the above technical solution, a flexible water storage tank is connected to the bottom of the sealed tarpaulin, so that the accumulated water at the bottom of the steaming space can be located and stored, avoiding direct contact of the accumulated water with the pier body, which would cause the bottom of the pier body to absorb excessive water, thereby improving the steaming effect of the pier body; the pressure generated by the accumulated water in the flexible water storage tank causes the side wall of the flexible water storage tank to fit tightly with the pier body, fully utilizing the accumulated water and improving the sealing effect of the steaming shed.

[0020] Preferably, the cross-section of the flexible water storage tank is U-shaped.

[0021] Preferably, stepped splicing blocks are respectively provided at both ends of the flexible water storage tank; adjacent flexible water storage tanks are connected via the splicing blocks; and magnetic elements are provided in the splicing blocks.

[0022] By adopting the above technical solution, the stepped splicing blocks can improve the sealing of the connection of the flexible water storage tank. By arranging magnetic parts at the splicing blocks, the splicing speed of the flexible water storage tank is greatly improved. The mutual adsorption of the magnetic parts can make the splicing blocks fit tightly, thereby improving the sealing effect of the flexible water storage tank.

[0023] Preferably, an overflow pipe is provided at the bottom of the flexible water storage tank; the top of the overflow pipe is located in the steaming space, and the bottom is connected to the outside world; a water float is overlapped on the top of the overflow pipe; a guide rod is provided at the bottom of the water float; the guide rod is slidably arranged in the overflow pipe.

[0024] By adopting the above technical solution, an overflow pipe is provided at the bottom of the flexible water storage tank to avoid excessive accumulation of water. In particular, a water float is provided at the top of the overflow pipe, which not only seals the overflow pipe and improves the sealing of the steaming space, but also can automatically open or close the overflow pipe according to water level changes, thereby greatly improving the flexibility of water level control in the flexible water storage tank.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. By splicing multiple splicing parts into a frame around the pier body, and setting sealing tarpaulins on the splicing parts in advance, the pier body can be sealed around after the multiple splicing parts are spliced ​​into the frame, which greatly improves the installation efficiency of the steaming shed; by movably connecting the multiple splicing parts, hard extrusion between the splicing parts due to temperature changes is prevented, and the service life of the frame is greatly improved; by arranging a flexible sealing tube in the activity space, and connecting the flexible sealing tube and the bottom of the steaming space to each other, especially by arranging a pressurized tube in the flexible sealing tube, and connecting the pressurized tube with the steam transmission pipeline, the steam generating component is used as the power, and the accumulated water generated in the steaming space is fully utilized to flexibly seal the activity space.

[0027] 2. When the steam temperature in the steam transmission pipeline increases, the water in the accommodating cavity partially vaporizes, causing the volume of the flexible sealing sleeve to increase, thereby allowing the flexible sealing sleeve to seal the pressurized pipe. After the pressurized pipe is sealed, the water in the return pipe and multiple groups of flexible sealing pipes flows to the bottom of the steam curing space, allowing the width of the flexible sealing pipe to automatically change according to the width of the activity space, thereby improving the flexibility of the flexible sealing pipe.

[0028] 3. By connecting a flexible water storage tank at the bottom of the sealing tarpaulin, the accumulated water at the bottom of the steam curing space can be stored and positioned, avoiding direct contact with the pier body, thereby preventing the bottom of the pier body from absorbing excessive water, improving the steam curing effect of the pier body; the pressure generated by the accumulated water in the flexible water storage tank will make the side wall of the flexible water storage tank closely fit the pier body, fully utilizing the accumulated water and improving the sealing effect of the steam curing shed. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a structure schematic diagram of the split assembled pier body turnover formwork steam curing shed after installation

[0030] Figure 2 is a schematic diagram of the split assembled pier body turnover formwork steam curing shed.

[0031] Figure 3 is a distribution schematic diagram of the return pipe in the embodiment.

[0032] Figure 4 is a schematic diagram of the connection state of the split assembled pier body turnover formwork steam curing shed and the pier body.

[0033] Figure 5 is a connection relationship diagram of the return pipe and the pressurizing pipe in the embodiment.

[0034] Figure 6 is Figure 5 A local enlarged view of the embodiment.

[0035] Figure 7 is a structure schematic diagram of the flexible water storage tank in the embodiment.

[0036] Figure 8 is Figure 4 A local enlarged view of the embodiment.

[0037] Figure 9 is a structure schematic diagram of the movable connection state of the splicing part in the embodiment.

[0038] BRIEF DESCRIPTION OF DRAWINGS:

[0039] 1, frame body; 11, splicing part; 111, movable space; 112, first bolt; 113, nut; 114, elastic member; 12, sealing tarpaulin; 121, steam curing space;

[0040] 2, steam generating assembly; 21, steam transmission pipeline; 22, water tank; 23, steam generator; 24, steam emission pipeline;

[0041] 3, flexible sealing pipe; 31, flexible drainage guide rod;

[0042] 4, pressurizing pipe; 41, flexible sealing sleeve;

[0043] 5, return pipe; 51, Venturi tube;

[0044] 6. Flexible water storage tank; 61. Splicing block;

[0045] 7. Overflow pipe;

[0046] 8. Water skip; 81. Guide rod;

[0047] 9. Pier body;

[0048] 10. Make the mold template. DETAILED DESCRIPTION

[0049] The following is combined with Figure 1-9 This application is described in further detail.

[0050] The embodiment of the present application discloses a block-assembly type pier body turning mold steaming shed. Figure 1-5 , a block-assembled pier body mold-turning steaming shed, comprising a frame 1 mounted on the pier body 9; the frame 1 has the freedom to slide vertically along the pier body 9; the frame 1 comprises a plurality of groups of splicing parts 11; a sealing tarpaulin 12 is respectively provided on the periphery of the plurality of groups of splicing parts 11; the sealing tarpaulin 12 is made of PVC or rubber; a steaming space 121 is formed between the plurality of groups of sealing tarpaulins 12 and the pier body 9; the sealing tarpaulin 12 is wrapped around the outside of the splicing part 11; the sealing tarpaulins 12 at the top and bottom of the splicing part 11 are respectively fan-shaped; after the plurality of splicing parts 11 are spliced ​​together to form the frame 1, the sealing tarpaulins 12 at the top and bottom cover each other, providing a good sealing environment for the steaming space 121; a sealing tarpaulin 12 is provided on the frame 1 There is a steam generating assembly 2; the steam generating assembly 2 has a steam transmission pipe 21 for transmitting steam; the steam generating assembly 2 fills steam into the steam curing space 121 through the steam transmission pipe 21; the top of multiple groups of flexible sealed tubes 3 are connected to the bottom of the steam curing space 121 through the return pipe 5; one end of the pressurized tube 4 extends into the return pipe 5, and the other end is connected to the steam transmission pipe 21; a Venturi tube 51 is provided in the return pipe 5, and the Venturi tube 51 is located below the pressurized tube 4; after the steam flow in the pressurized tube 4 enters the return pipe 5, it is pressurized by the Venturi tube 51, and the upper part of the return pipe 5 is evacuated, so that the flexible sealed tube 3 extracts the accumulated water from the steam curing space 121.

[0051] Specifically, the steam generating assembly 2 includes a water tank 22, a steam generator 23 and a steam eruption pipeline 24; the water tank 22 is connected to the steam generator 23; the steam generator 23 is connected to the steam eruption pipeline 24 through a steam transmission pipe 21; the steam eruption pipeline 24 is arranged on the frame 1; two layers of steam eruption pipelines 24 are laid up and down around the frame 1.

[0052] Reference Figure 9, adjacent splicing parts 11 are movably connected; specifically, adjacent splicing parts 11 are connected by a first bolt 112 and a nut 113; an elastic member 114 is connected between the head of the first bolt 112 and the splicing part 11; the elastic member 114 is a spring; the elastic member 114 is used to provide a force for the first bolt 112 to move away from the splicing part 11; there is an active space 111 between adjacent splicing parts 11; a flexible sealing tube 3 is vertically provided in the active space 111; the flexible sealing tube 3 is used to seal the active space 111; the bottom end of the flexible sealing tube 3 is connected to the bottom of the steaming space 121; the top end of the flexible sealing tube 3 passes through the sealing tarpaulin 12 and extends downward, and is connected to the bottom of the steaming space 121; a pressurized pipe 4 is provided in the flexible sealing tube 3; the top end of the pressurized pipe 4 passes through the flexible sealing tube 3 and is connected to the steam transmission pipe 21.

[0053] Reference Figures 3 to 6 , both sides of the splicing part 11 are respectively provided with arc-shaped grooves for accommodating the flexible sealing tube 3; the two sides of the flexible sealing tube 3 are respectively fitted with the inner walls of the two adjacent arc-shaped grooves, which increases the contact area between the flexible sealing tube 3 and the frame 1 and improves the sealing effect; a flexible diversion guide rod 31 is coaxially provided in the flexible sealing tube 3; the flexible diversion guide rod plays a role in guiding the water flow, so that the accumulated water at the bottom of the steaming space 121 is smoothly adsorbed into the flexible sealing tube 3; the flexible guide rod can also play a supporting role, so that the flexible sealing tube 3 can smoothly transmit the accumulated water, and prevent the flexible sealing tube 3 from being suddenly sucked by the pressurized tube 4. shrunken situation; a flexible sealing sleeve 41 is provided in the pressurized pipe 4; the flexible sealing sleeve 41 is made of rubber; there is a accommodating cavity inside the flexible sealing sleeve 41; there is water in the accommodating cavity, and when the steam temperature in the steam transmission pipe 21 increases, the moisture in the accommodating cavity is partially vaporized, so that the volume of the flexible sealing sleeve 41 increases, and then the flexible sealing sleeve 41 blocks the pressurized pipe 4; after the pressurized pipe 4 is blocked, the water in the return pipe 5 and the multiple groups of flexible sealing tubes 3 flows into the bottom of the steaming space 121, so that the width of the flexible sealing tube 3 can be automatically changed according to the width of the activity space 111; the flexibility of the flexible sealing tube 3 is improved.

[0054] Reference Figure 4 、 Figure 7 and Figure 8The bottoms of multiple groups of sealed tarpaulins 12 are respectively connected to flexible water storage tanks 6; the bottoms of the flexible sealing tubes 3 are connected to the interior of the flexible water storage tanks 6; the return pipe 5 is connected to the interior of any flexible water storage tank 6; the cross-section of the flexible water storage tank 6 is U-shaped; both ends of the flexible water storage tank 6 are respectively provided with stepped splicing blocks 61; adjacent flexible water storage tanks 6 are connected by splicing blocks 61; magnetic parts are provided in the splicing blocks 61; an overflow pipe 7 is provided at the bottom of the flexible water storage tank 6; the top of the overflow pipe 7 is located in the steaming space 121, and the bottom is connected to the outside world; a water float 8 is overlapped on the top of the overflow pipe 7; the water float 8 is spherical, and a guide rod 81 is provided at the bottom of the water float 8; the guide rod 81 is slidably set in the overflow pipe 7.

[0055] The working principle of a block-assembled pier body turning mold steaming shed in this application is:

[0056] First, multiple splicing parts 11 are connected to each other and spliced ​​around the pier body 9 to form a frame 1; multiple sets of electric hoists are provided on the turnover template 10, and the frame 1 is hooked with the hook lock on the electric hoist, and the frame 1 is lifted to the specified position, and the frame 1 is fixed to the turnover template 10 by the second bolt; then multiple flexible water storage tanks 6 at the bottom of the frame 1 are connected; the ends of the multiple flexible water storage tanks 6 away from the frame 1 are fastened to the pier body 9 by steel ropes, so as to seal the bottom of the frame 1; the top of the frame 1 is fixed to the pier body 9, and the bottom of the frame 1 is sealed. The sealing tarpaulin 12 is fastened to the mold template 10 by steel ropes; after the bottom surface of the mold template 10 is connected to the frame 1, the sealing tarpaulin 12 can be used to seal the top of the steaming space 121; then the steam eruption pipeline 24 is laid on the frame 1, and the steam transmission pipeline is connected to the steam generator 23; then multiple flexible sealing tubes 3 are respectively passed upward through the activity space 111 and connected to the return pipe 5, and then the pressurized pipe 4 is connected to the steam transmission pipe 21. At this point, the installation of the steaming shed is completed.

[0057] It should be noted that one end of the return pipe 5 is fixedly connected to the flexible water storage tank 6; one end of the flexible sealing pipe 3 is fixedly connected to the flexible water storage tank 6, so when installing the steaming shed, it is only necessary to directly connect the return pipe 5 and the flexible sealing pipe 3.

[0058] Before the steaming shed is operated, some water needs to be stored in the flexible water storage tank 6. After the steam generator 23 is turned on, part of the steam is pressurized by the pressure pipe 4 and filled into the return pipe 5, forming a negative pressure at the top of the return pipe 5, and then the water in the flexible water storage tank 6 is drawn into the return pipe 5 through the flexible sealing pipe 3, and the flexible sealing pipe 3 is expanded, thereby sealing the activity space 111; when the temperature in the steaming space 121 needs to be increased, the temperature in the steam transmission pipe 21 increases, and the moisture in the accommodating cavity is vaporized, so that the volume of the flexible sealing sleeve 41 increases, and then the flexible sealing sleeve 41 blocks the pressure pipe 4; after the pressure pipe 4 is blocked, the water in the return pipe 5 and the multiple groups of flexible sealing pipes 3 flows into the bottom of the steaming space 121. At this time, the splicing part 11 expands after being heated and fits each other. The volume of the flexible sealing pipe 3 decreases after losing water to adapt to the changes in the activity space 111.

[0059] Water droplets generated by the steam in the steaming space 121 will continuously fall into the flexible water storage tank 6. In order to prevent excessive water in the flexible water storage tank 6, an overflow pipe 7 and a water float 8 are provided at the bottom of the flexible water storage tank 6. When the water level rises to the water float 8, the water float 8 is lifted up to open the overflow pipe 7, and excess water flows out from the overflow pipe 7, so that the water level in the flexible water storage tank 6 can always be maintained in an appropriate range.

[0060] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A block-assembly pier body turning mold steaming shed, characterized by: The invention comprises a frame (1) sleeved on a pier body (9); the frame (1) has the freedom to slide vertically along the pier body (9); the frame (1) comprises a plurality of splicing parts (11); the outer peripheries of the plurality of splicing parts (11) are respectively provided with sealing tarpaulins (12); a steam curing space (121) is formed between the plurality of sealing tarpaulins (12) and the pier body (9); a steam generating assembly (2) is provided on the frame (1); the steam generating assembly (2) has a steam transmission pipe (21) for transmitting steam ); the steam generating assembly (2) fills the steam curing space (121) with steam through the steam transmission pipe (21); adjacent splicing parts (11) are movably connected; there is a movable space (111) between adjacent splicing parts (11); a flexible sealing tube (3) is vertically provided in the movable space (111); the flexible sealing tube (3) is used to seal the movable space (111); the bottom end of the flexible sealing tube (3) is communicated with the bottom of the steam curing space (121); The steam generating assembly (2) comprises a water tank (22), a steam generator (23) and a steam eruption pipeline (24); the water tank (22) is connected to the steam generator (23); the steam generator (23) is in communication with the steam eruption pipeline (24) via the steam transmission pipeline (21); the steam eruption pipeline (24) is arranged on the frame (1); A flexible drainage guide rod (31) is coaxially provided in the flexible sealing tube (3); The tops of the multiple groups of flexible sealing tubes (3) are connected to the bottom of the steaming space (121) through the return pipe (5); one end of the pressurizing tube (4) extends into the return pipe (5), and the other end is connected to the steam transmission pipe (21); A flexible sealing sleeve (41) is provided in the pressurized tube (4); a receiving cavity is provided inside the flexible sealing sleeve (41); and water is provided in the receiving cavity; The bottoms of the multiple groups of sealed tarpaulins (12) are respectively connected to flexible water storage tanks (6); the bottoms of the flexible sealing tubes (3) are in communication with the interior of the flexible water storage tanks (6); and the return pipe (5) is in communication with the interior of any one of the flexible water storage tanks (6).

2. The block-assembly pier body turning mold steaming shed according to claim 1 is characterized in that: Adjacent splicing portions (11) are connected via first bolts (112) and nuts (113); an elastic member (114) is connected between the head of the first bolt (112) and the splicing portion (11); the elastic member (114) is used to provide a force to move the first bolt (112) away from the splicing portion (11).

3. The block-assembly pier body turning mold steaming shed according to claim 1 is characterized in that: The cross section of the flexible water storage tank (6) is U-shaped.

4. The block-assembly pier body turning mold steaming shed according to claim 1 is characterized in that: Both ends of the flexible water storage tank (6) are respectively provided with stepped splicing blocks (61); adjacent flexible water storage tanks (6) are connected via the splicing blocks (61); and magnetic elements are provided in the splicing blocks (61).

5. The block-assembly pier body turning mold steaming shed according to claim 1 is characterized in that: An overflow pipe (7) is provided at the bottom of the flexible water storage tank (6); the top of the overflow pipe (7) is located in the steaming space (121), and the bottom is communicated with the outside world; a water float (8) is overlapped at the top of the overflow pipe (7); a guide rod (81) is provided at the bottom of the water float (8); the guide rod (81) is slidably arranged in the overflow pipe (7).

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