What do I need to pay attention to when maintaining a cast iron gate?

1) Before the gate is installed, first check whether the bolts of each connection part are loose due to transportation and handling, and if there is any looseness, they should be tightened. (2) Check whether there is any dislocation of the waterstop surface on the connection between the main vertical frame and the transverse frame, and if there is any dislocation, loosen the connecting bolt to adjust the waterstop surface in the same plane. (3) When the gate is installed, it should be installed in place as a whole, and it is forbidden to install the gate frame and gate plate separately to prevent the gate frame from deforming.

4) Before the second phase of pouring, the gate will be hoisted in place as a whole, and then the correct position of the front and back, left and right, and then the bolts will be adjusted and the engineering reinforcement will be welded firmly. (5) Before the gate leaves the factory, in order to make the gate plate and the gate frame fit more tightly, and reduce the gap after installation, the gate of more than 2 meters is installed with a pressing plate card iron on the upper and lower horizontal frames, and the top wire is added to the inclined iron of the vertical frame.

The cast iron bearing of the cast iron gate is a closed cylindrical structure, and the cast iron gate is mainly used to bear the gravity or support reaction force when opening and closing the gate, and the load-bearing bearing is installed inside, and the appearance is relatively exquisite. The shield of the cast iron gate is made of thin-walled stainless steel pipe, and its length is generally 200mm larger than the gate stroke, so that one end is sealed, and the other end is bolted to the upper electric device of the winch hoist, which can effectively protect the screw thread from damage.

Precautions: If the operator works sloppily, does not check before operating according to the gate opening and closing procedures or the original operator asks for leave for business, the substitute staff is not familiar with the opening and closing procedures and methods, and operates blindly. If the opening and closing direction is reversed, the gate is opened when the gate is closed, the wrong button is pressed when the electric opening and closing is pressed or the reverse direction is shaken when the manual opening and closing, and the direction of the closing gate is misoperated as the opening gate; Some are when the operator is not concentrated, and the brake fails to stop immediately at the lower limit position, and some are the limit nut and limit mark of the screw are displaced, and there is no limit effect.

The electric hoist will also encounter the power supply department in the maintenance of electrical equipment or power supply lines when the power supply phase sequence changes, resulting in the motor on the hoist changing the original direction of operation, resulting in the change of the opening and closing direction of the hoist.

As a hard-core "flood control artifact", generally speaking, cast iron gates are not easy to rust and corrode, because the raw materials of cast iron gates contain "chromium" elements, which can prevent the metal matrix from being eroded by water, form an effective passivation film on the surface of the cast iron gate, and greatly improve the ability to prevent rust and corrosion. In addition, the surface of the cast iron gate will be treated with anti-corrosion, which can also greatly reduce the occurrence of rust.

Cast iron gate is mainly used in water conservancy projects for drainage and regulation of drainage, with flood control and flood discharge, water supply and irrigation, navigation power generation, removal of sediment floats and other functions, especially with the continuous progress of manufacturing technology, cast iron gate in technology and function have been significantly improved, the use of strong pressure will be cast iron gate strictly sealed, and the cast iron gate surface for anti-rust and corrosion treatment, can also improve the anti-wear ability, increase the service life of cast iron gate, continue to contribute to flood control. Cast iron gate is an indispensable part of hydraulic mechanical engineering, relying on flexible opening and closing methods to maintain the safety of hydraulic engineering.

The cast iron material used in the cast iron gate has the characteristics of good thermal conductivity, high strength and easy processing, and is a good material for the mechanical parts of the gate that require stress, toughness and wear resistance. In order to improve the anti-corrosion ability of the cast iron gate, the surface of the cast iron gate will be treated during production to achieve the effect of anti-rust and corrosion.

In addition, in order to ensure the performance of the cast iron gate, it is also necessary to regularly inspect and maintain it, so as to effectively prevent and prevent the rust and corrosion of the cast iron gate.

Cast iron gate has a great role in agriculture and water conservancy engineering, cast iron gate compared with other metal gates, not only simple operation, but also not easy to rust and corrode, can save a lot of manpower and material resources for engineering construction.

The cast iron gate itself has a strong anti-corrosion ability, and the surface does not need to be treated with special anti-corrosion. The surface can be sprayed with anti-rust paint.

Since the cast iron gate is a one-time integral installation, it is necessary to carefully check the condition of each component before installation, and adjust it in time, mainly need to pay attention to the following aspects:

1. Before the gate is installed, first check whether the bolts of the connecting parts of each part are loose due to the looseness caused by the loading and unloading of the transportation, and if there is looseness, it should be reinforced.

2, check whether the waterstop surface of the main vertical loss frame and the attached frame, the main vertical frame and the horizontal frame, the ram and the gate frame are dislocated, and if there is dislocation, the loose coupling bolt adjusts the waterstop surface in the same plane.

3. The gate ante air destroyer needs to be installed as a whole, and it is strictly forbidden to disassemble and install.

4. Installation adjustment, the foundation layout of the first phase of the gate is equipped with steel bars and a certain welding length. Before the second phase of pouring, the gate is hoisted in place as a whole, the bolts are adjusted and tightened, the correct position of the gate is found before and after, left and right, straightened and leveled, fixed with a pull wire, and then the bolts are adjusted to weld with the engineering steel bar, and then the feeler gauge is used to detect to ensure that the gap of each waterstop surface is below, and finally the second phase of pouring can be carried out.

5. The gate should be treated with anti-rust treatment in use, and butter should be smeared on the waterproof surface regularly to ensure that the waterproof joint surface of the gate plate and the gate frame is smooth when opening and closing.

1. Before the gate is installed, the bolts of each connecting part should be checked first to see if they are loose due to transportation and unloading, and if they are loose, they should be tightened.

2. Check whether there is any dislocation of the waterstop surface on the connection between the main frame and the transverse frame, and if there is any dislocation, loosen the connecting bolt to adjust the waterstop surface in the same plane.

3. When the gate is installed, it should be installed in place as a whole, and it is forbidden to install the gate frame and gate plate separately for security inspection to prevent the deformation of the gate frame.

4) Before the second phase of pouring, the gate will be hoisted in place as a whole, and then the correct position of the front and back, left and right, and then the bolts will be adjusted and the engineering reinforcement will be welded firmly.

5. Before the gate leaves the factory, in order to make the gate plate and the gate frame fit more tightly, and reduce the gap after installation, the gate of more than 2 meters is installed on the upper and lower transverse frame, and the top wire is added to the oblique iron of the vertical frame, and the top wire on the card iron and the inclined iron is removed after the adjustment of the reed circle gap, so as to open and close the gate.

6. When pouring concrete, the mortar flowing into the gate plate, gate frame, inclined iron, and baffle gap should be cleared to prevent the mortar from solidifying and affecting the opening and closing.

Cast iron gate is widely used in water conservancy projects for its good water-stopping effect, strong anti-corrosion ability, and low maintenance costs, and its specifications are also relatively complete, which can meet the needs of various small and medium-sized hydraulic buildings.

However, when the cast iron gate is installed, if the method of reserving bolt holes and pouring concrete for the second time is adopted, due to the large number of reserved bolt holes on the gate frame, when installing the door frame, the contact between the door frame and the concrete surface of the door groove will inevitably produce a gap, and the water-stopping effect will be greatly weakened. In addition, whether the concrete surface at the door groove is straight or not will directly affect the opening of the gate and the overall aesthetics.

Implement the overall hoisting of cast iron gate on site, and measure the construction technology of formwork fixing and pouring on site. This construction method has a good water-stopping effect. The construction plan of the cast iron gate project is presented, which is worth collecting.

Cast iron gate needs to be after the pouring of the bottom plate of the hydraulic building, when the concrete reaches the design strength of about the right or so, the gate plate and the gate frame such as lifting equipment and excavators are hoisted at the same time, standing in the side pier or the middle pier in the gate groove of the bottom plate embedded steel building, the fixing bolt is penetrated into the bolt hole of the gate frame, and the middle and side pier steel bars are put on and the nut is flattened, and the level is leveled according to the design elevation.

After all the above-mentioned work is completed, each fixing bolt that passes through the door frame is welded firmly with the middle pier reinforcement with electric welding, so that the gate stands firmly on the bottom plate according to the design requirements.

The cast iron gate is difficult to support in the formwork, especially the wedge iron part of the gate, so it needs to be measured and produced on site. If it is a porous gate, it should be measured one by one, and it should be noted that the protective layer of the reinforcement must be left sufficient according to the design requirements. The gap between the formwork is sealed with wide transparent tape to avoid the slurry running and mold expansion phenomenon of concrete during pouring, which affects the normal opening and closing of the gate.

The steel bars of the cast iron gate groove and the pier head are dense, so they need to be specially prepared when pouring concrete. While ensuring its design strength and frost resistance and impermeability requirements, the workability of concrete should be considered appropriately. The particle size of the coarse aggregate is about one smaller than that under normal circumstances, and the slump is determined according to the actual density of the steel bar, and the slump is controlled between one, so as to avoid the concrete being blocked by the denser steel bar, so that the concrete is not compact, and the gate leakage occurs.

After laying the steel bars of the hoist workbench and before the concrete is poured, the hard plastic is buried and the thread buckle is damaged when the lead screw is installed. After pouring is completed, when the concrete strength reaches the design strength, the hoisting and closing base is lifted to the reserved opening, after the hanging ball and the gate hanging point are hoisted, the corner bolt is directly inserted into the concrete, the surrounding concrete is artificially vibrated with a steel bar and makes it compact, and finally the hoisting and closing base is leveled with a level, and the formwork can be removed only after the strength of the concrete reaches the design strength. Surplus.

Attention should be paid to the following matters in the installation and maintenance of gate valves: 1. Handwheels, handles and transmission mechanisms are not allowed to be used for lifting, and collisions are strictly prohibited. 2. The double gate valve should be installed vertically (that is, the valve stem is in a vertical position, and the handwheel is at the top).

3. The gate valve with bypass valve should be opened before opening (to balance the pressure difference between the inlet and outlet and reduce the opening force). 4. The gate valve with the transmission mechanism shall be installed according to the provisions of the product instruction manual. 5. If the valve is often opened and closed, lubricate it at least once a month.

4) Handwheels, handles and transmission mechanisms are not allowed to be used for lifting, and collisions are strictly prohibited. 5) The gate valve with transmission mechanism shall be installed according to the provisions of the product instruction manual. 6. Executive standard 1), product standard "General Valve Flange Connection Iron Gate Valve" GB T 12232-2005 "Steel Valve General Requirements" GB T 12224-2005 "Steel Flat Gate Valve for Pipelines" JB T 5298-91 "Inspection and Test of Valve" JB T 9092-1999 "Safety Evaluation Standard for Drinking Water Transmission and Distribution Equipment and Protective Materials" GB T 17219-1998 2), Engineering Standard Code for Construction Quality Acceptance of Building Water Supply, Drainage and Heating Engineering" GB 50242-2002 "Code for Construction Quality Acceptance of Ventilation and Air Conditioning Engineering" GB50243-2002