Cement pole production steam curing device and steam curing method

Abstract

The application provides a steam curing device and method for cement pole production, and relates to the technical field of cement product production and maintenance. The steam curing device for cement pole production comprises a steam curing pool body, a heat preservation pool cover and a steam supply system. The steam curing pool body is internally provided with a partition sealing gas distribution mechanism with an independent air chamber. The inner side of the end wall of both ends is provided with a telescopic butt joint in-mold butt joint gas supply mechanism. The outside is provided with a two-stage waste heat recovery mechanism for heat energy hierarchical utilization. In the application, through the collaborative application of partition sealing gas distribution, internal and external synchronous steam curing and waste heat closed-loop recovery, the device can flexibly adjust the effective curing volume according to the production batch, reduce the temperature difference of the concrete section and realize the hierarchical reuse of heat energy. While improving the uniformity of pole maintenance and the strength of the finished product, the production energy consumption is effectively reduced, and the industrial production demand of multiple specifications of cement poles is adapted.

Description

Technical Field

[0001] This invention relates to the field of cement product manufacturing and curing technology, specifically to a steam curing device and method for cement utility pole production. Background Technology

[0002] In the industrialized production process of cement utility poles, steam curing is a core process for improving the early strength of concrete, shortening the production cycle, and increasing mold turnover. Currently, the industry commonly uses atmospheric pressure pit-type steam curing, which uses a monolithic steam curing tank made of reinforced concrete as the carrier. Steam pipes are laid on the side wall of the tank, and high-temperature saturated steam is introduced into the enclosed tank to provide a high-temperature and high-humidity curing environment for the concrete poles, accelerating the cement hydration process. Existing conventional steam curing equipment is mostly equipped with temperature control systems, insulated tank covers, and condensate drainage structures, which can basically meet the steam curing requirements of conventional pole sizes. Some improved solutions optimize steam curing energy consumption and curing quality to a certain extent by optimizing nozzle layout and increasing the thickness of the insulation layer.

[0003] However, existing pit-type cement pole steam curing devices still have clear technical defects in actual production applications: First, the integral pool is a fixed volume structure, which cannot adjust the effective curing space according to the number of molds in a single batch. When producing small batches, the proportion of empty area in the pool is large, the steam filling loss is high, and the energy consumption per unit product remains high. Moreover, the single-point air distribution on the side can easily cause vertical and axial temperature differences in the pool, resulting in uneven curing quality of the poles. Second, relying solely on external steam heating of the mold, the heating rate of the concrete pole core lags significantly behind that of the surface layer. The temperature difference between the inside and outside of the cross-section can easily induce temperature stress, generate internal micro-cracks, reduce the structural strength and durability of the finished product, and make it difficult to meet the production quality requirements of high-strength prestressed poles. Third, the high-temperature waste steam and condensate discharged during the steam curing process are directly discharged, and the large amount of low-grade waste heat they carry cannot be effectively utilized. This not only causes a double waste of energy and water resources, but also leads to high temperature and humidity in the local environment of the workshop, deteriorating working conditions and failing to meet the requirements of energy conservation and emission reduction in green production. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a steam curing device and method for producing cement utility poles, solving the problems mentioned in the background section.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A steam curing device and method for producing cement power poles includes a steam curing tank, an insulated tank cover covering the top of the steam curing tank, and a steam supply system located outside the steam curing tank. The steam curing tank is equipped with a zoned sealing gas distribution mechanism inside, and an in-mold docking gas supply mechanism is provided on the inner side of the end walls at both ends of the steam curing tank. The steam curing tank is also equipped with a two-stage waste heat recovery mechanism outside. The partitioned sealing gas distribution mechanism includes a gas dispersing support component laid on the bottom wall of the steam curing tank, transverse guide rails symmetrically fixed to the inner walls of the long side walls on both sides of the steam curing tank, and a heat-insulating partition baffle slidably connected between the two transverse guide rails. The gas dispersing support component is divided into several independent air chambers along the width of the tank. The top plate of each independent air chamber is densely covered with conical air outlet holes. The side wall of each independent air chamber is connected to an air inlet branch pipe. Each air inlet branch pipe is connected to the steam supply system. The upper edge, lower edge, and both sides of the heat-insulating partition baffle are fitted with sealing strips. The lower surface of the heat-insulating partition baffle is slidably sealed to the upper surface of the gas dispersing support component. The two ends of the heat-insulating partition baffle are slidably engaged with the transverse guide rails on the corresponding sides. The in-mold gas supply mechanism includes an installation frame fixed to the inner side of the end wall of the steam curing tank, a drive cylinder fixedly installed on the installation frame, and a steam pipe fixedly connected to the output end of the drive cylinder. The outer wall of the front end of the steam pipe is fitted with a sealing ring. The tail end of each steam pipe is connected to a gas supply branch pipe. Each gas supply branch pipe is connected to the steam supply system. Each gas supply branch pipe is connected in series with a flow regulating valve. The two-stage waste heat recovery mechanism includes a primary heat exchange unit, a secondary preheating air duct, and a condensate recovery tank. The air inlet of the primary heat exchange unit is connected to the exhaust port at the top of the steam curing tank through an exhaust pipe. The air outlet of the primary heat exchange unit is connected to the air inlet of the secondary preheating air duct. A water supply pipe is coiled inside the primary heat exchange unit. The water inlet of the condensate recovery tank is connected to the drain outlet at the bottom of the steam curing tank and the drain outlet at the bottom of the air distribution support component through pipes. The water outlet of the condensate recovery tank is connected to the water inlet of the water supply pipe of the primary heat exchange unit. The above technical solution allows for flexible division of the effective curing space based on the number of molds in a single batch. Simultaneously, it enables synchronous steam heating of the concrete outside and inside the mold, and graded recovery and reuse of the heat energy carried by the exhaust steam and condensate discharged during steam curing. The three mechanisms work together to complete the steam curing operation of the cement poles.

[0006] Furthermore, each independent air chamber is equipped with a supporting column, the upper and lower ends of which are fixedly connected to the top plate and bottom plate of the air dispersing support assembly, respectively. The top plate of the air dispersing support assembly is made of reinforced concrete or stainless steel. Through the above technical solutions, the support columns can provide vertical support to the top plate, disperse the load of the overhead poles, and prevent the top plate from deforming due to long-term pressure. The two types of top plate materials can be flexibly selected according to the degree of corrosion and load-bearing requirements of the production scene, and are suitable for different factory production conditions.

[0007] Furthermore, a flow divider cone is fixedly installed on the bottom plate of each independent air chamber, directly above the inlet of the air intake branch pipe; Through the above technical solution, the diversion cone can buffer and divert the steam that is delivered at high speed through the intake branch pipe, preventing the steam from directly hitting the local area of ​​the top plate, allowing the steam to diffuse evenly in the independent air chamber, and ensuring that the steam output of the conical air outlets at each position tends to be consistent.

[0008] Furthermore, the heat-insulating partition is made of fiberglass or color steel sandwich insulation material, the sealing strip is made of silicone rubber, and a sliding guide wheel is embedded in the top of the heat-insulating partition, which is rotatably connected to the auxiliary guide rail at the top of the steam curing tank. Through the above technical solutions, the thermal insulation partition baffle itself has good thermal insulation performance, which can reduce the heat transfer from the curing area to the vacant area; the silicone rubber sealing strip is resistant to high temperature and high humidity and has a stable sealing effect; the sliding guide wheel can convert sliding friction into rolling friction, reduce the resistance when the baffle slides, and make it easier and smoother to adjust the position.

[0009] Furthermore, elastic positioning pins are embedded in both ends of the heat-insulating partition plate, and several positioning grooves are opened on the inner side wall of the transverse guide rail. The elastic positioning pins are engaged with the positioning grooves on the corresponding sides. With the above technical solution, after the heat-insulating partition baffle slides to the target work position, the elastic positioning pin can automatically engage with the corresponding positioning groove to lock the position of the baffle, preventing displacement due to steam pressure impact during steam curing and ensuring the reliability of the partition sealing.

[0010] Furthermore, the mounting frame is made of stainless steel, the axis of the steam pipe is parallel to the length direction of the steam curing tank, and the steam pipes are arranged at equal intervals along the width direction of the steam curing tank. Through the above technical solutions, the stainless steel mounting frame is not easy to rust or deform in high temperature and high humidity environments, and has a longer service life; the steam pipes are arranged in parallel at equal intervals, which can accurately correspond to the end air inlets of each row of molds, ensuring coaxiality during docking and adapting to standardized mold station layouts.

[0011] Furthermore, a guide sleeve is fixedly provided on the mounting frame for each steam pipe, and the steam pipe slides through the inside of the guide sleeve; Through the above technical solution, the guide sleeve can radially limit the extension and retraction of the steam tube, avoid skewing and shaking during the extension and retraction of the tube, improve the stability and accuracy of the docking action, and at the same time reduce the radial force on the output end of the drive cylinder and reduce component wear.

[0012] Furthermore, the inner wall of the steam curing tank is embedded with an insulation layer, which is made of rock wool or polyurethane insulation material. The insulation tank cover is a double-layer steel plate sandwiched with insulation core material structure. The top surface of the secondary preheating air duct is uniformly provided with air outlet holes. Through the above technical solutions, the insulation layer and the insulation tank cover can reduce the overall heat dissipation rate of the tank and reduce the heat loss during the steam curing process; the air outlets evenly distributed on the secondary preheating air duct can allow the recovered residual steam to be blown upwards evenly, ensuring that the preheating effect of each part of the mold to be put into the tank is consistent.

[0013] A steam curing method for producing cement utility poles, using the aforementioned steam curing device for producing cement utility poles, includes the following steps: S1: Check the operation status of the steam supply system, the zoned sealing gas distribution mechanism, the in-mold docking gas supply mechanism, and the two-stage waste heat recovery mechanism. After confirming that everything is correct, hoist the electric pole with the mold into the gas dissipation support component inside the steam curing tank, and adjust the heat insulation partition baffle to the gap of the corresponding mold row and fix it. S2: Close the heat preservation pool cover, turn on the steam supply system, and introduce steam into the independent air chamber corresponding to the curing area. At the same time, drive the cylinder to extend the steam pipe and connect it with the air inlet at the end of the pole mold, and introduce steam into the mold at the same time to enter the heating stage. S3: After the temperature is raised to the set temperature, the flow regulating valve is adjusted to maintain a constant temperature. During the steam curing process, the exhaust steam discharged from the tank enters the first-stage heat exchange unit and exchanges heat with the water in the water supply pipeline. The residual steam after heat exchange is sent into the second-stage preheating air duct. S4: After the constant temperature stage is completed, the main steam supply pipeline of the steam supply system is shut off, and the cooling stage begins. The condensate in the pool and the gas distribution support component flows into the condensate recovery tank, and after treatment, it is sent to the water replenishment pipeline. S5: After cooling is complete, open the heat preservation tank cover, drive the cylinder to retract the steam pipe, and lift out the molded pole. Repeat the above operation according to the production batch to complete the steam curing operation of multiple batches of poles.

[0014] This invention provides a steam curing device and method for producing cement utility poles. It has the following beneficial effects: 1. This invention provides a steam curing device and method for cement power pole production. By setting up a zoned sealed gas distribution mechanism, combined with the independent gas chamber branch gas supply and the space adjustment of the heat insulation partition baffle, the effective curing volume can be flexibly compressed according to the production scale of a single batch, reducing the ineffective steam filling of empty areas and significantly reducing the steam consumption per unit pole. At the same time, the full-section gas distribution method of the bottom conical air outlet hole makes the steam rise evenly from bottom to top, eliminating the problem of uneven temperature field caused by side gas distribution, ensuring that the poles in each station in the pool are heated evenly, improving the uniformity of the strength of the finished product, adapting to customized production scenarios of multiple specifications and small batches, and reducing production energy consumption costs.

[0015] 2. This invention provides a steam curing device and method for producing cement utility poles. By setting up an in-mold gas supply mechanism, and cooperating with the automatic docking of steam pipes and precise control of flow regulating valves, synchronous heating of the external pool steam and internal steam circulation of the pole mold can be achieved. This reduces the temperature difference between the inside and outside of the concrete cross section, reduces the risk of internal micro-cracks caused by temperature stress, makes the overall hydration reaction of the pole more uniform, improves the structural strength and durability of the finished product, reduces the defect rate in subsequent quality inspection stages, and meets the production quality requirements of high-strength prestressed cement utility poles.

[0016] 3. This invention provides a steam curing device and method for cement power pole production. By setting up a two-stage waste heat recovery mechanism, combined with the water replenishment and preheating of the first-stage heat exchange unit and the mold preheating of the second-stage preheating air duct, the waste heat of the exhaust steam and condensate discharged during steam curing can be recovered and utilized in stages. The recovered heat energy is fed back to the front end of the steam curing process, reducing the fuel consumption of the steam boiler and the amount of tap water used. At the same time, it avoids the temperature rise and high humidity problems in the workshop environment caused by direct discharge of high-temperature steam, optimizes the on-site working environment, and conforms to the green and low-carbon production development direction. Attached Figure Description

[0017] Figure 1 This is an isometric view of the present invention; Figure 2 This is a second-view isometric view of the present invention; Figure 3 This is a diagram of the internal structure of the present invention; Figure 4 This is a schematic diagram of the overall partitioned sealing air distribution mechanism of the present invention; Figure 5 This is a detailed internal view of the air-dissipating support component of the present invention; Figure 6 This is a front view of the thermal insulation partition baffle of the present invention; Figure 7 This is a detailed view of the transverse guide rail of the present invention; Figure 8 This is a detailed view of the in-mold docking air supply mechanism of the present invention; Figure 9 This is a detailed overall view of the two-stage waste heat recovery mechanism of the present invention.

[0018] Explanation of reference numerals in the attached figures: 1. Steam curing tank body; 11. Insulation layer; 2. Insulated tank cover; 3. Steam supply system; 4. Zoned sealing and air distribution mechanism; 41. Air dispersing support assembly; 411. Independent air chamber; 412. Conical air outlet; 413. Air inlet branch pipe; 414. Support column; 415. Diverting cone; 42. Horizontal guide rail; 421. Positioning groove; 43. Insulated partition baffle; 431. Sealing strip; 432. Sliding... Guide roller; 433, elastic positioning pin; 5, in-mold docking air supply mechanism; 51, mounting frame; 52, drive cylinder; 53, steam pipe; 531, sealing ring; 54, air supply branch pipe; 55, flow regulating valve; 56, guide sleeve; 6, two-stage waste heat recovery mechanism; 61, primary heat exchange unit; 611, water supply pipeline; 62, secondary preheating air duct; 621, air outlet; 63, condensate recovery box. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0020] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0022] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0023] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0024] like Figure 1-8 As shown, this embodiment of the invention provides a steam curing device and method for producing cement power poles, including a steam curing tank body 1, an insulated tank cover 2, a steam supply system 3, a zoned sealing gas distribution mechanism 4, an in-mold docking gas supply mechanism 5, and a two-stage waste heat recovery mechanism 6. The steam curing tank 1 is a rectangular reinforced concrete structure, semi-underground in layout, with the tank opening flush with the workshop floor for easy hoisting and transport of molds. The inner wall of the tank is fully covered with an insulation layer 11, made of rock wool or polyurethane, which effectively blocks heat transfer from the tank to the outside, reducing heat loss during steam curing. The choice of material can be flexible based on the factory's ambient temperature and budget. Auxiliary guide rails are laid along the length of the top sides of the steam curing tank 1 to support the top sliding of the insulation partition baffle 43, ensuring vertical stability during the baffle's sliding process. The long side of the top of the tank... An exhaust port is provided on one side to discharge excess steam in the tank. An adjustable air valve is installed at the exhaust port to adjust the exhaust volume according to the pressure in the tank. A drain port is provided at the lowest point of the bottom of the tank to collect and discharge condensate water condensed on the inner wall of the tank and the surface of the mold. A one-way valve is installed at the drain port to prevent external water vapor from flowing back in. The two ends of the steam curing tank 1 are short side end walls. The inner side of the end wall is used to install the in-mold docking air supply mechanism 5. Sealing pipe perforations are reserved on the end wall so that the air supply branch pipe 54 can pass through and connect to the external steam supply system 3. The perforations are filled with high temperature resistant sealing material to ensure the overall airtightness of the tank. The insulated pool cover 2 is fitted onto the top opening of the steam curing pool 1. It adopts a composite structure of double-layer steel plate sandwiching insulation core material. The outer steel plate is made of corrosion-resistant carbon structural steel, the inner layer is stainless steel plate, and the middle is filled with insulation core material. The overall weight is light and the insulation performance is excellent. The lower surface of the pool cover is a flat structure without protruding components. It can be pressed tightly against the sealing strip 431 on the top of the insulation partition baffle 43 to achieve top surface sealing after partitioning. There is no need to open a corresponding slot at the bottom of the pool cover. It can be adapted to any stopping position of the baffle. The insulated pool cover 2 can be opened and closed by workshop lifting equipment and is suitable for hoisting and moving electric pole molds. The edge of the pool cover is provided with a sealing strip. After closing, it fits tightly with the pool opening to reduce heat loss at the edge. The steam supply system 3 is located on the outside of the steam curing tank 1 and includes a steam boiler, main gas supply pipeline, control valve group and pressure monitoring components. It provides a stable high-temperature saturated steam source for the entire steam curing device. The main gas supply pipeline is divided into two lines. One line is connected to each air inlet branch pipe 413 of the gas distribution support component 41 for external tank steam curing. The other line is connected to each gas supply branch pipe 54 of the in-mold gas supply mechanism 5 for internal mold steam curing. Both lines can independently adjust the steam pressure and flow rate to adapt to different curing process requirements. The zoned sealing gas distribution mechanism 4 is installed inside the steam curing tank 1 and is the core component for achieving zoned energy saving and uniform gas distribution. It includes a gas distribution support assembly 41, a transverse guide rail 42, and an insulated partition baffle 43. The gas distribution support assembly 41 is laid on the inner bottom wall of the steam curing tank 1 and has a rectangular box-shaped structure. Its external dimensions match the dimensions of the bottom cavity of the tank. After fixed installation, it fits tightly against the bottom of the tank. The gas distribution support assembly 41 is divided into several independent air chambers 411 along the width of the tank. Each independent air chamber 411 is a long, narrow cavity extending along the length of the tank. The independent air chambers 411 are completely isolated from each other by sealing partitions and are not interconnected. To achieve independent air supply and shutdown of each individual air chamber, the top plate of each individual air chamber 411 is densely covered with conical air outlets 412. The conical air outlets 412 have a conical structure that is wider at the top and narrower at the bottom, which allows the steam to diffuse more evenly in all directions when it diffuses upward, avoiding localized high temperatures caused by concentrated airflow and improving the uniformity of the vertical temperature field. Each individual air chamber 411 has an air inlet branch pipe 413 connected to its side wall. Each air inlet branch pipe 413 passes through the side wall of the steam curing tank 1 and connects to the steam supply system 3. Each air inlet branch pipe 413 can be independently controlled to achieve individual air supply to the corresponding individual air chamber 411. Combined with the heat insulation partition baffle 43, it can achieve zoned curing. Each independent air chamber 411 is equipped with several supporting columns 414, which are evenly spaced along the length of the chamber. The upper and lower ends of the columns are fixedly connected to the top and bottom plates of the air distribution support assembly 41, respectively, to bear the mold load above the top plate, preventing deformation and ensuring structural stability. The supporting columns are made of the same material as the air chamber walls to ensure overall structural strength matching. On the bottom plate of each independent air chamber 411, a flow-diverting cone 415 is fixedly installed directly above the inlet of the air inlet branch pipe 413. The flow-diverting cone 415 is shaped like a frustum of a cone, with its bottom surface fixed to the bottom plate of the air chamber and its apex facing the inlet direction, allowing for high-speed... The incoming steam is diverted and buffered to ensure that the steam diffuses evenly to both ends of the gas chamber, preventing excessive airflow at the outlet directly opposite the pipe opening and ensuring uniform gas distribution throughout the entire length of the gas chamber. The top plate of the gas diffuser support component 41 is made of reinforced concrete or stainless steel, which can be flexibly selected according to the corrosive environment and load-bearing requirements of the production scene. Both materials have sufficient structural strength and resistance to water vapor corrosion. A drain outlet is provided at the lowest point of the bottom plate of the gas diffuser support component 41. The drain outlet is connected to the external condensate recovery tank 63 through a pipeline, which can drain the condensate in the gas chamber in time, preventing water accumulation from affecting the gas distribution effect and reducing the risk of corrosion inside the gas chamber. There are two transverse guide rails 42, which are symmetrically fixed on the inner walls of the long side walls on both sides of the steam curing tank 1. The height of the guide rails is flush with the top surface of the air diffuser support component 41. The guide rails extend along the width of the tank and span the entire width of the tank. The transverse guide rails 42 are made of corrosion-resistant metal and have a smooth surface to reduce the frictional resistance of the baffle sliding. The inner side wall of the transverse guide rails 42 is provided with several positioning grooves 421. The positioning grooves 421 are evenly spaced along the length of the guide rail and the spacing corresponds to the column spacing of a single mold. They are used to cooperate with the positioning and fixing of the heat insulation partition baffle 43 to ensure that the baffle always stays in the gap position of the mold column and does not occupy the mold placement space. The thermal insulation partition baffle 43 is a vertically arranged rectangular plate, running the entire length of the pool. Its height matches the height of the pool's inner cavity. Both ends are respectively engaged with two transverse guide rails 42, allowing it to slide along the width of the pool. The thermal insulation partition baffle 43 is made of fiberglass or color steel sandwich insulation material, possessing excellent thermal insulation performance. It effectively blocks heat transfer between the curing area and the vacant area, reducing ineffective heat loss in the vacant area. The upper, lower, and side edges of the thermal insulation partition baffle 43 are all fitted with… The sealing strip 431 is made of silicone rubber, which is resistant to high temperature and has excellent elasticity. It is not easy to age and deform under long-term high temperature and high humidity environment. The sealing strip 431 at the lower edge slides and seals against the upper surface of the gas dissipation support component 41, and the sealing strips 431 at both sides slide and seal against the inner side wall of the transverse guide rail 42. The sealing strip 431 at the upper edge can be pressed by its own weight after the heat preservation tank cover 2 is closed, so as to achieve top surface sealing, ensure the overall airtightness after partitioning, and prevent steam from the curing area from leaking into the empty area. The top of the heat-insulating partition baffle 43 is embedded with several sliding guide wheels 432. The sliding guide wheels 432 are arranged at equal intervals along the length of the baffle. The rollers are connected to the auxiliary guide rail at the top of the steam curing tank 1. This can convert the sliding friction of the baffle into rolling friction, greatly reducing the resistance during the sliding process, making the position adjustment smoother, and reducing the intensity of manual adjustment. Both ends of the heat-insulating partition baffle 43 are embedded with elastic positioning pins 433. The pin heads of the elastic positioning pins 433 face the inner side wall of the guide rail. The internal spring components can automatically pop out when the baffle slides to the corresponding position and lock into the positioning groove 421 of the transverse guide rail 42 to lock the position of the baffle. This prevents the baffle from shifting due to steam pressure fluctuations during the steam curing process and ensures the reliability of the partition sealing. When the position of the baffle needs to be adjusted, a transverse thrust can be applied to retract the elastic positioning pins 433 and release the locking state. There are two sets of in-mold docking air supply mechanisms 5, which are respectively set on the inner side of the end wall at both ends of the steam curing tank 1. Their positions correspond one to one, and together they complete the docking air supply and exhaust at both ends of the mold. They are the core components for realizing synchronous steam curing inside and outside. Each set includes a mounting frame 51, a drive cylinder 52, a steam pipe 53, an air supply branch pipe 54, a flow regulating valve 55, and a guide sleeve 56. The mounting frame 51 is a stainless steel frame structure, which is fixedly installed on the inner side of the end wall of the steam curing tank 1 and extends along the width of the tank. The overall structure has sufficient rigidity to support the docking air supply components and prevent corrosion and deformation in the long-term high temperature and high humidity environment. A drive cylinder 52 is fixedly installed on the mounting frame 51 for each mold station. The output end of the drive cylinder 52 faces the inside of the tank and is fixedly connected to the tail end of the steam pipe 53. It can drive the steam pipe 53 to move in and out along the length of the tank, realizing automatic docking and separation with the air inlet of the mold. No manual operation is required, avoiding the risk of burns from high temperature steam. The steam pipe 53 is a tubular structure made of stainless steel. Its axis is parallel to the length of the steam curing tank 1. Each steam pipe 53 is arranged at equal intervals along the width of the tank, and the spacing is consistent with the mold row spacing to ensure coaxial correspondence with the air inlet at the end of the mold and improve docking accuracy. The front end of the steam pipe 53 is fitted with a sealing ring 531. The sealing ring 531 is made of high temperature resistant silicone rubber. It can fill the docking gap when the pipe is inserted into the air inlet of the mold to ensure the sealing of the docking point, prevent steam leakage inside the mold, and ensure stable pressure and temperature during steam curing inside the mold. Each steam pipe 53 is connected to a gas supply branch pipe 54 at its tail end. The gas supply branch pipe 54 is made of high-temperature resistant flexible hose. After passing through the sealed perforation of the end wall of the pool body, it is connected to the steam supply system 3. The flexible pipeline can adapt to the extension and retraction of the pipe, avoiding damage to the pipeline by pulling. Each gas supply branch pipe 54 is connected in series with a flow regulating valve 55, which can independently regulate the steam flow and pressure of the corresponding steam pipe 53, realize the precise control of the in-mold steam curing parameters of a single mold, and adjust the in-mold steam supply according to the pole specifications and concrete mix ratio to ensure the matching of the internal and external heating rates. The mounting frame 51 is fixedly equipped with a guide sleeve 56 corresponding to each steam pipe 53. The guide sleeve 56 is a sleeve structure made of self-lubricating material. The steam pipe 53 slides through the inside of the guide sleeve 56, which can radially limit the extension and retraction of the pipe, avoid deviation during the movement, improve the stability and accuracy of the docking action, and at the same time reduce the radial force on the output end of the drive cylinder 52, reduce wear, and extend the service life of the components. The two-stage waste heat recovery mechanism 6 is located outside the steam curing tank 1 and is the core component for realizing closed-loop utilization of heat energy. It includes a primary heat exchange unit 61, a secondary preheating air duct 62, and a condensate recovery tank 63. The primary heat exchange unit 61 is a gas-water heat exchange device with a shell-and-tube heat exchange structure. The air inlet is connected to the exhaust port at the top of the steam curing tank 1 through the exhaust pipe, and the air outlet is connected to the air inlet of the secondary preheating air duct 62. The primary heat exchange unit 61 has a water supply pipe 611 coiled inside. The water supply pipe 611 is made of metal with excellent thermal conductivity. The water inlet is connected to the water outlet of the condensate recovery tank 63, and the water outlet is connected to the water supply port of the steam boiler. When the high-temperature waste steam flows through the shell side of the heat exchange unit, it fully exchanges heat with the cold water in the tube side, preheating the boiler water before sending it into the boiler, which can reduce the heating energy consumption of the boiler and improve the heat energy utilization rate. The secondary preheating air duct 62 is set on one side of the steam curing tank 1. It is a long strip box structure that extends along the length of the tank and matches the length of the tank. Several air outlets 621 are evenly opened on the top surface. The low-temperature residual steam after the primary heat exchange is sent into the air duct and then blown upward evenly through the air outlets 621 to preheat the mold rods placed above the air duct and waiting to enter the tank. This shortens the heating stage time after the mold enters the tank, speeds up the turnover efficiency of the whole tank, and further consumes the residual heat in the residual steam, improving the adequacy of waste heat recovery. The condensate recovery tank 63 is located on the lower outer side of the steam curing tank 1. The water inlet is connected to the drain outlet at the bottom of the steam curing tank 1 and the drain outlet at the bottom of the air diffuser support component 41 through pipelines. It can collect all the condensate generated during the steam curing process. The tank is equipped with a sedimentation zone and a filtration zone to purify the condensate, remove impurities and suspended solids, and then send it to the water replenishment pipeline 611 for recycling, reducing the consumption of tap water in the production process. At the same time, the temperature of the condensate can also increase the initial temperature of the water replenishment, further reducing the boiler energy consumption.

[0025] Example 2: This embodiment is basically the same as the structure of embodiment 1, except that: the number of heat insulation partition baffles 43 is set to two pieces. Both baffles can slide independently along the transverse guide rail 42, which can divide the interior of the steam curing tank 1 into three independent curing areas. Each curing area corresponds to several sets of independent air chambers 411 and the in-mold gas supply mechanism 5. The steam supply and temperature parameters of each area can be independently controlled. Three poles of different specifications and different curing regimes can be steam cured at the same time, further improving the adaptability and production flexibility of the device. Meanwhile, the exhaust ports of each maintenance area are independently connected to the air intake manifold of the primary heat exchange unit 61, ensuring that the exhaust from maintenance areas with different pressures does not interfere with each other and that the waste heat recovery process operates stably. The condensate recovery pipelines are also divided into zones and then uniformly converged into the condensate recovery tank 63 to avoid cross-flow of condensate from different maintenance areas. This embodiment is suitable for multi-variety, small-batch pole production scenarios, and can simultaneously complete steam curing operations with different process requirements in the same tank, reducing equipment downtime and improving overall production efficiency.

[0026] This invention discloses a steam curing method for producing cement utility poles, comprising the following steps: Equipment inspection and mold placement: Before operation, check the sealing of the steam supply system 3 and the status of the valves. Confirm that the heat insulation partition baffle 43 of the partition sealing gas distribution mechanism 4 slides smoothly and the elastic positioning pin 433 is reliably engaged. Check that the drive cylinder 52 of the in-mold docking gas supply mechanism 5 is operating normally and that the steam pipe 53 is not blocked. Confirm that the heat exchange pipeline and recovery pipeline of the two-stage waste heat recovery mechanism 6 are unobstructed. After all checks are confirmed to be correct, use lifting equipment to hoist the electric poles with molds into the gas dissipation support components 41 inside the steam curing tank 1 one by one. After the molds are placed in place, push the heat insulation partition baffle 43 to slide along the transverse guide rail 42 to the gap of the outermost mold row. Fix it by engaging the elastic positioning pin 433 into the corresponding positioning groove 421. Divide the tank into a curing area containing all the molds and an empty area on the outside. Sealing and synchronous heating: The insulation tank cover 2 is closed by the lifting equipment, so that the tank cover presses the sealing strip 431 on the top of the insulation partition baffle 43 to complete the overall sealing. Then the steam supply system 3 is turned on, and high temperature steam is introduced only into the independent air chamber 411 corresponding to the curing area. The steam is divided by the diversion cone 415 and fills the air chamber. It overflows evenly upward through the conical air outlet 412 to heat the outside of the mold. At the same time, the drive cylinders 52 at both ends are started, which drive the steam pipe 53 to extend along the guide sleeve 56 and insert it into the air inlet at the end of the corresponding mold. The sealing ring 531 fills the joint gap to achieve sealing. Steam is synchronously introduced into the mold to enter the heating stage. The steam flow rate inside the mold is controlled by the flow regulating valve 55 to ensure that the heating rate inside and outside is matched. Constant temperature curing and waste heat recovery: When the temperature in the pool rises to the set constant temperature, the steam supply of the steam supply system 3 is adjusted, and the flow regulating valve 55 is used to maintain the temperature stability in the pool and the mold, and the constant temperature curing stage is entered. During the steam curing process, the excess high temperature waste steam in the pool is discharged into the first-stage heat exchange unit 61 through the top exhaust port, and exchanges heat with the cold water in the water supply pipe 611. The preheated water is sent into the steam boiler, and the low temperature waste steam after heat exchange is sent into the second-stage preheating air duct 62, and blown out evenly through the air outlet 621 to preheat the mold waiting to be put into the pool above. Steam shutdown and cooling and condensate recycling: After the constant temperature stage reaches the process requirements, the main steam supply pipeline of the steam supply system 3 is shut off, and the external and internal steam supply is stopped. The cooling stage begins. The temperature inside the pool is gradually reduced by controlling the opening of the exhaust port. During the cooling process, the condensate condensed on the inner wall of the pool, the surface of the mold and the air chamber is discharged through the bottom drain of the pool and the drain of the air chamber, respectively, and flows into the condensate recovery tank 63. After sedimentation and filtration, it is sent to the water supply pipeline 611 for boiler water recycling. Opening the cover and discharging material and circulating operation: After cooling to the set temperature and buffering, open the heat preservation tank cover 2, drive the cylinder 52 to drive the steam pipe 53 to retract and separate from the end of the mold. Then use the lifting equipment to lift out the molded pole and transfer to the next process. Repeat the above operation according to the production batch to complete the continuous steam curing operation of multiple batches of cement poles.

[0027] Working principle: After the mold-bearing pole is hoisted into the air-dissipating support assembly 41 inside the steam curing tank 1, the heat-insulating partition baffle 43 is pushed along the transverse guide rail 42 to the gap of the corresponding mold row. The baffle is fixed by the engagement of the elastic positioning pin 433 and the positioning groove 421, dividing the tank into a curing area and an empty area. After the heat-insulating tank cover 2 is closed, the steam supply system 3 is turned on, and steam is only introduced into the independent air chamber 411 corresponding to the curing area. The steam is divided by the diversion cone 415 and fills the independent air chamber 411. It overflows evenly upward through the conical air outlet 412 on the top plate to heat the outside of the mold. At the same time, the drive cylinder 52 drives the steam pipe 53 to extend along the guide sleeve 56 and connect with the air inlet at the end of the mold. The sealing ring 531 ensures the sealing of the connection. The steam enters the inside of the mold through the air supply branch pipe 54 and the steam pipe 53. The flow regulating valve 55 controls the steam flow and temperature inside the mold to achieve synchronous heating inside and outside. During the steam curing process, the excess high-temperature waste steam in the tank enters the first-stage heat exchange unit 61 through the top exhaust port and exchanges heat with the internal coiled water supply pipe 611 to preheat the boiler water. The low-temperature waste steam after heat exchange is sent to the second-stage preheating air duct 62 and blown out evenly through the top air outlet 621 to preheat the electric rod with mold to be put into the tank. The condensate generated during the steam curing process is discharged from the bottom drain port of the steam curing tank 1 and the bottom drain port of the gas dissipation support component 41, and flows into the condensate recovery tank 63. After sedimentation and filtration, it is sent to the water supply pipe 611 for recycling. After the constant temperature stage is completed, the main steam supply pipe is closed. After the temperature is gradually reduced, the drive cylinder 52 drives the steam pipe 53 to retract. After the heat preservation tank cover 2 is opened, the finished mold can be lifted out, completing a single steam curing process.

[0028] The following points should be noted in this article: 1. The accompanying drawings of the embodiments disclosed herein only relate to the structures involved in the embodiments disclosed herein; other structures can be referred to in a general design.

[0029] 2. Where there is no conflict, the embodiments of this disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A steam curing device for producing cement utility poles, comprising a steam curing tank (1), an insulated tank cover (2) covering the top of the steam curing tank (1), and a steam supply system (3) disposed outside the steam curing tank (1), characterized in that: The steam curing tank (1) is equipped with a partitioned sealing gas distribution mechanism (4), and the inner side of the end wall at both ends of the steam curing tank (1) is equipped with an in-mold docking gas supply mechanism (5). The steam curing tank (1) is equipped with a two-stage waste heat recovery mechanism (6). The partitioned sealing gas distribution mechanism (4) includes a gas dispersing support assembly (41) laid on the inner bottom wall of the steam curing tank (1), transverse guide rails (42) symmetrically fixed to the inner walls of the long side walls on both sides of the steam curing tank (1), and a heat-insulating partition baffle (43) slidably connected between the two transverse guide rails (42). The gas dispersing support assembly (41) is divided into several independent air chambers (411) along the width direction of the tank. The top plate of each independent air chamber (411) is densely covered with conical air outlet holes (412). Each independent air chamber (411) has an air inlet branch pipe (413) connected to its side wall. Each air inlet branch pipe (413) is connected to the steam supply system (3). The upper edge, lower edge and both sides of the heat insulation partition (43) are fitted with sealing strips (431). The lower surface of the heat insulation partition (43) slides and seals against the upper surface of the air dissipation support assembly (41). The two ends of the heat insulation partition (43) slide and engage with the corresponding transverse guide rails (42). The in-mold gas supply mechanism (5) includes an installation frame (51) fixed to the inner side of the end wall of the steaming tank (1), a drive cylinder (52) fixedly installed on the installation frame (51), and a steam pipe (53) fixedly connected to the output end of the drive cylinder (52). The front end of the steam pipe (53) is fitted with a sealing ring (531). Each steam pipe (53) is connected to a gas supply branch pipe (54) at its tail end. Each gas supply branch pipe (54) is connected to the steam supply system (3). Each gas supply branch pipe (54) is connected in series with a flow regulating valve (55). The two-stage waste heat recovery mechanism (6) includes a primary heat exchange unit (61), a secondary preheating air duct (62), and a condensate recovery tank (63). The air inlet of the primary heat exchange unit (61) is connected to the exhaust port at the top of the steam curing tank (1) through an exhaust pipe. The air outlet of the primary heat exchange unit (61) is connected to the air inlet of the secondary preheating air duct (62). A water replenishment pipe (611) is coiled inside the primary heat exchange unit (61). The water inlet of the condensate recovery tank (63) is connected to the drain outlet at the bottom of the steam curing tank (1) and the drain outlet at the bottom of the air distribution support component (41) through pipes. The water outlet of the condensate recovery tank (63) is connected to the water inlet of the water replenishment pipe (611) of the primary heat exchange unit (61).

2. The steam curing device for cement pole production according to claim 1, characterized in that: Each independent air chamber (411) is equipped with a support column (414). The upper and lower ends of the support column (414) are fixedly connected to the top plate and bottom plate of the air dispersing support assembly (41), respectively. The top plate of the air dispersing support assembly (41) is made of reinforced concrete or stainless steel.

3. The steam curing device for cement pole production according to claim 2, characterized in that: On the bottom plate of each independent air chamber (411), a diversion cone (415) is fixedly installed directly above the inlet of the air inlet branch pipe (413).

4. The steam curing device for cement pole production according to claim 1, characterized in that: The heat-insulating partition baffle (43) is made of fiberglass or color steel sandwich insulation material, the sealing strip (431) is made of silicone rubber, and the top of the heat-insulating partition baffle (43) is embedded with a sliding guide wheel (432), which is rolledly connected to the auxiliary guide rail at the top of the steam curing tank (1).

5. The steam curing device for producing cement utility poles according to claim 4, characterized in that: Both ends of the heat-insulating partition baffle (43) are fitted with elastic positioning pins (433), and the inner sidewall of the transverse guide rail (42) is provided with several positioning grooves (421). The elastic positioning pins (433) are engaged with the positioning grooves (421) on the corresponding side.

6. The steam curing device for producing cement utility poles according to claim 1, characterized in that: The mounting frame (51) is made of stainless steel. The axis of the steam pipe (53) is parallel to the length direction of the steam curing tank (1). Each steam pipe (53) is arranged at equal intervals along the width direction of the steam curing tank (1).

7. The steam curing device for producing cement utility poles according to claim 6, characterized in that: The mounting frame (51) is fixedly provided with a guide sleeve (56) corresponding to each steam tube (53), and the steam tube (53) slides through the inside of the guide sleeve (56).

8. The steam curing device for cement pole production according to claim 1, characterized in that: The inner wall of the steam curing tank (1) is inlaid with a heat insulation layer (11), which is made of rock wool or polyurethane insulation material. The heat insulation tank cover (2) is a double-layer steel plate sandwiched with heat insulation core material structure. The top surface of the secondary preheating air duct (62) is evenly provided with air outlet holes (621).

9. A steam curing method for producing cement utility poles, using the steam curing apparatus for producing cement utility poles as described in any one of claims 1-8, characterized in that, Includes the following steps: S1: Check the operation status of the steam supply system (3), the partition sealing gas distribution mechanism (4), the in-mold docking gas supply mechanism (5), and the two-stage waste heat recovery mechanism (6). After confirming that there are no errors, hoist the electric rod with the mold into the gas distribution support component (41) inside the steam curing tank (1), and adjust the heat insulation partition baffle (43) to the gap of the corresponding mold row and fix it. S2: Close the heat preservation pool cover (2), turn on the steam supply system (3), and introduce steam into the independent air chamber (411) corresponding to the maintenance area. At the same time, drive the cylinder (52) to drive the steam pipe (53) to extend and connect with the air inlet at the end of the pole mold, and introduce steam into the mold at the same time to enter the heating stage. S3: After the temperature is raised to the set temperature, the flow regulating valve (55) is adjusted to maintain the constant temperature. During the steam curing process, the exhaust steam discharged from the pool enters the first-stage heat exchange unit (61) and exchanges heat with the water in the water supply pipeline (611). The residual steam after heat exchange is sent into the second-stage preheating air duct (62). S4: After the constant temperature stage ends, the main steam supply pipeline of the steam supply system (3) is closed, and the cooling stage begins. The condensate in the pool and the gas distribution support component (41) flows into the condensate recovery tank (63), and after treatment, it is sent into the water replenishment pipeline (611). S5: After cooling is completed, open the heat preservation tank cover (2), drive the cylinder (52) to drive the steam pipe (53) to retract, lift out the molded pole, repeat the above operation according to the production batch, and complete the steam curing operation of multiple batches of poles.

Images