CN111605034A

CN111605034A - Steam curing production line and steam curing method for precast concrete component

Info

Publication number: CN111605034A
Application number: CN202010625953.2A
Authority: CN
Inventors: 张伟; 胡庆春; 宫明; 曹仁仁; 邹瑞合; 朱晓仪
Original assignee: Shandong Nuoyang Construction Technology Co ltd; Yanjian Group Co Ltd
Current assignee: Shandong Nuoyang Construction Technology Co ltd; Yanjian Group Co Ltd
Priority date: 2020-07-02
Filing date: 2020-07-02
Publication date: 2020-09-01

Abstract

The invention relates to a steam curing production line and a steam curing method for precast concrete members, wherein the production line consists of a steam heat source machine system, a steam transmission pipeline, a mould table and a steam curing shed; water is converted into dry steam by the steam heat source machine, and the dry steam is distributed to each pipeline through the steam distributing cylinder and finally enters the steam curing shed of the production line. Each valve on the steam transmission pipeline is respectively and independently controlled to control the module, the temperature and the humidity are controlled through the steam maintenance shed and the temperature and humidity sensing probe, the temperature control in the maintenance process is divided into temperature rise and natural temperature reduction, wherein the temperature preservation time of each stage is strictly controlled, and finally the strength of the component is ensured to reach the specified requirement after the natural temperature reduction. The mold has the advantages of low manufacturing cost, small occupied area, high site utilization rate, high operation flexibility, good maintenance effect, shortened mold stripping time, improved mold stripping strength, improved production efficiency, no crack on the surface of the component and high utilization rate of heat energy.

Description

Steam curing production line and steam curing method for precast concrete component

Technical Field

The invention relates to a steam curing production line and a steam curing method for a precast concrete member, and belongs to the technical field of precast concrete member curing.

Background

Traditional precast concrete component steam curing production line comprises mould platform, conveying pulley and steam curing kiln, and the workman carries out reinforcement and conveys forward to shaking table department through the pulley after accomplishing and pours the vibration, if one of them link efficiency is too slow, the workman of follow-up link just can't continue work, greatly reduces work efficiency. When concrete is poured, only one plate can be poured at the same time, and the vibrating table can only vibrate one mould table at the same time. And then conveying to a steam curing kiln for curing, and conveying to a plate discharging position for discharging and loading after curing. Therefore, a large amount of equipment needs to be purchased on the traditional precast concrete member steam curing production line, the manufacturing cost is high, a large amount of fields need to be occupied, the number of the mould platforms which can be produced simultaneously is small, and the field utilization rate is low. Production can only be carried out according to the process, once the middle transmission pulley has a problem, the die table cannot be continuously conveyed forwards, the production of the die table at the back is affected, and accidents are easy to happen. Precast concrete component is at the maintenance in-process, and inside can produce the heat to make inside easy high temperature and damage inner structure, make its bulk strength can not reach the requirement, the outward appearance also appears the crack easily, makes actual strength be less than design intensity. And the traditional boiler is special equipment which needs to be checked for approval; initially heating for 20-40 min; the softened water system is easy to scale, and the heat efficiency is reduced; the material inside the furnace body has low conductivity coefficient; when the equipment is used for heat preservation production, the productivity is excessive; NOx emission is far higher than national standard; the potential safety hazard is great.

Disclosure of Invention

The invention aims to provide a steam curing production line and a steam curing method for precast concrete members.

The technical scheme provided by the invention is as follows: a precast concrete component steam curing production line comprises a steam heat source machine room, a mould platform, a steam conveying pipeline and a steam curing shed; it is characterized in that the preparation method is characterized in that,

the steam heat source machine room is internally provided with a master control platform, a water storage tank, a water purification machine, a water storage tank, a water feeding pump, a steam heat source machine, a steam-distributing cylinder and an automatic temperature and humidity adjusting system, the master control platform is respectively connected with the water storage tank, the steam heat source machine, the water feeding pump and the automatic temperature and humidity adjusting system, the water storage tank is connected with the water purification machine, the water purification machine is connected with the water storage tank, the water storage tank is connected with the water feeding pump, the water feeding pump is connected with the steam heat source machine, the steam heat source machine is connected with the steam-distributing cylinder, the steam-distributing cylinder is provided with two steam outlets and connected;

the die table comprises a plurality of die table groups consisting of large die table units and small die table units, and the small die table units and the large die table units are formed by welding a die table bottom plate and a die table framework on the die table bottom plate; the die table framework is formed by connecting two long frameworks, two short frameworks, uniformly distributed I-shaped steel frameworks and angle steel frameworks, the short frameworks are connected between two ends of the two long frameworks, the I-shaped steel frameworks are connected between the two long frameworks, and the angle steel frameworks are connected between the middle parts of the two adjacent I-shaped steel frameworks and between the I-shaped steel frameworks and the short frameworks; each module group is provided with a temperature sensing probe and a humidity sensing probe, and the temperature sensing probe and the humidity sensing probe are connected with an automatic temperature and humidity adjusting system in the steam heat source machine room through a second circuit;

the steam conveying pipeline is connected with a DN50 main pipeline, the DN50 main pipeline penetrates through the whole production line, a DN32 branch pipeline and a DN20 drain pipeline are arranged below each module group, and the DN32 branch pipeline is communicated with a DN20 drain pipeline; each DN32 branch pipeline is communicated with the DN50 main pipeline; the corners of the DN32 branch pipeline are connected by pipeline connecting elbows, the corners of the DN20 drain pipeline are connected by pipeline connecting elbows, the junction of the DN32 branch pipeline and the DN20 drain pipeline is connected by a bent pipe, and the horizontal height of the pipeline at the rear half part of the bent pipe is reduced; a DN50 steam valve is arranged on a DN50 branch pipeline under each module group, a DN20 drain valve is arranged on a DN20 drain pipeline under each module group, and the DN32 steam valve and the DN20 drain valve are respectively connected with pipelines at two sides of the two valves through a DN32 flange and a DN20 flange; the DN50 steam valve and the DN20 drain valve of each model platform group are connected with an electromagnetic valve, and the electromagnetic valve is connected with a master control platform through a first line;

circular steam injection holes are uniformly distributed on the DN32 branch pipeline, the included angle alpha between the connecting line of the circle center of the circular steam injection hole and the circle center of the pipeline section of the DN32 branch pipeline and the vertical direction is 45 degrees, the distance between the adjacent circular steam injection holes is 1m, and the circular steam injection holes are arranged on the two sides of the DN32 branch pipeline in a crossed manner;

the movable vibrator is arranged on the long frameworks on two sides below the die table and comprises a vibrator seat, a vibrator engine and a vibrator are arranged on the vibrator seat, a buckle is connected to the vibrator engine, and a pulley is arranged at the lower end of the vibrator seat and connected with the vibrator engine; a rail is arranged below the die table, and a pulley is arranged on the rail; the vibrator engine is connected with the main control console;

and a plurality of cushion block iron pieces are arranged below each die table group.

Further, the mold stage includes 11 large mold stage units of 4 × 12m and 12 small mold stage units of 4 × 9m, including 10 sets of first mold stage groups each having a length of 21m and composed of one small mold stage unit of 4 × 9m and one large mold stage unit of 4 × 12m, and 1 set of second mold stage groups each having a length of 18m and composed of two small mold stage units of 4 × 9m and a third mold stage group composed of a single large mold stage unit of 4 × 12 m; the length of the I-shaped steel framework is 3.8m, and the total number of the I-shaped steel frameworks is 15; the long framework is made of 28a channel steel, the short framework is made of 20a channel steel, the I-shaped steel framework is made of 20a I-shaped steel, and the angle steel framework is made of 10/8 hot-rolled inequilateral angle steel.

Furthermore, the DN32 branch pipe is 23m long, the DN20 hydrophobic pipe is 2m long, and the diameter of the circular steam jet hole is 5 mm.

Furthermore, the cushion block iron piece consists of a cushion block bottom plate, a cushion block side plate, cushion block I-steel, a cushion block top plate and a cushion block barrier strip; 4 reserved bolt holes are formed in the cushion block bottom plate and connected with the reserved holes in the ground through bolts, and the whole iron piece is fixed on the ground; the cushion block bottom plate is welded and connected with two cushion block side plates, and the cushion block I-shaped steel is connected between the two cushion block side plates to prevent the I-shaped steel from sliding transversely; the cushion block I-shaped steel is movably connected with the cushion block side plate, and after the die table is leveled, the height between the cushion block I-shaped steel and the cushion block bottom plate is adjusted according to the height difference and then the cushion block I-shaped steel and the cushion block bottom plate are fixedly connected through welding; the cushion block I-steel is connected with a cushion block top plate, two cushion block retaining strips are welded on the cushion block top plate, the distance between the two cushion block retaining strips is identical to the distance between the two long frameworks of the die table in size, and the two cushion block retaining strips can clamp the long frameworks when the die table is placed.

Furthermore, the steam curing shed comprises a steam curing shed frame, plastic tarpaulin and a track wheel mechanism, and is characterized in that the steam curing shed frame is a telescopic steam curing shed frame and consists of a plurality of uniformly distributed steam curing shed frame units and folding support units connected between the steam curing shed frame units, each steam curing shed frame unit comprises two square steel pipe main frames and a bent square steel pipe curved beam connected between the upper ends of the two square steel pipe main frames, and each square steel pipe main frame is provided with a sliding node capable of sliding up and down; the folding support unit comprises a first folding support and a second folding support which are arranged in a crossed mode, the lower end of the first folding support and the lower end of the second folding support are connected to sliding nodes of two adjacent square steel tube main frames through screws respectively, and the upper end of the first folding support and the upper end of the second folding support are fixed to the two adjacent square steel tube main frames through screws respectively; the rail wheel mechanism comprises two steel pipe guide rails and a plurality of guide rail wheels which are uniformly distributed, the lower end of each square steel pipe main frame is connected with one guide rail wheel through screws, and the guide rail wheels are arranged on the guide rails.

Furthermore, the plastic tarpaulin comprises an inner tarpaulin and an outer tarpaulin, the inner tarpaulin is arranged at the inner side of the telescopic steam-curing shed frame in full length, and the inner tarpaulin is connected with the square steel tube main frame and the square steel tube curved beam of each steam-curing shed frame unit; the outer side tarpaulin is arranged at two ends of the telescopic steam curing shed frame and is connected with the upper parts of the square steel tube main frames of the steam curing shed frame units at the two ends and the square steel tube curved beams; the inner tarpaulin and the outer tarpaulin are overlapped on the square steel tube curved beams of the steam-curing shed frame units at two ends, and the inner tarpaulin and the outer tarpaulin are simultaneously fixed by the fixing nails; the outside tarpaulin is movably connected with the inside tarpaulin through nylon buttons.

A steam curing production method of a precast concrete member specifically comprises the following steps:

1) the precast concrete component steam curing production line is started and closed through a master control platform, parameter data of each curing shed are set, and the following parameters are set according to the environmental temperature T:

in the static maintenance stage, a temperature value T0 is T, a relative humidity value H0 is 50%, T0 is more than or equal to 5, T0 is 5 when the environmental temperature T is lower than 5 ℃, and the static maintenance time value is 2 hours;

in the first temperature rise stage, a temperature value T1 is T0+10, a relative humidity value H1 is 95%, and a time length value is 1 hour;

maintaining the temperature value T1 and the relative humidity value H1 for 1 hour at constant temperature for the first time;

in the second temperature rise stage, a temperature value T2 is T1+10, a relative humidity value H2 is 95%, and a time length value is 1 hour;

maintaining the temperature value T2 and the relative humidity value H2 at constant temperature for the second time, wherein the time length value is 1 hour;

in the third temperature rise stage, a temperature value T3 is T2+10, a relative humidity value H3 is 95%, the time length value is 1 hour, and T3 is more than 50 and less than 60;

maintaining the temperature value T3 and the relative humidity value H3 at constant temperature for the third time, wherein the time length value is 1 hour;

in the first cooling stage, a temperature value T4 is T3-10, a relative humidity value H4 is 90%, and a time length value is 1 hour;

in the second cooling stage, a temperature value T5 is T4-10, a relative humidity value H5 is 90%, and a time length value is 1 hour;

2) after the precast concrete component is poured, the main control platform controls a vibrator engine of the movable vibrator to drive a pulley to move to the bottom of the mould platform along the rail, and then the movable vibrator is tightly clamped on the mould platform through a buckle to sufficiently vibrate the concrete on the mould platform;

3) after the vibration is finished, the master control console controls to start a steam curing shed engine, when the steam curing shed is not used, the steam curing shed is in a contraction state, when the mould table needs to be cured, the steam curing shed engine is started through the master control console to drive the telescopic steam curing shed frame to extend, the guide rail wheels move along the guide rails, the folding supports rotate around the sliding nodes on the main frame along with the gradual increase of the distance between the adjacent steam curing shed frame units, the sliding nodes sleeved on the main frame are pulled to move upwards, the expansion of the invention is realized, and the whole product is in a tent shape after the expansion, so that the precast concrete components needing to be cured on the movable mould table exist in a closed space; the outside tarpaulin and the inside tarpaulin at the end part are fastened by nylon buttons to form an airtight closed steam curing space;

4) the main control console controls the tap water to enter the water storage tank, when the water level reaches 2/3 of the water storage tank, the tap water automatically enters the water purification machine for purification, and the purified water enters the water storage tank for storage; the main control console controls and starts the steam heat source machine and the water feed pump, the water feed pump sends purified pure water in the water storage tank into the steam heat source machine, and the steam heat source machine converts the pure water into high-dryness steam at a high speed and finally enters the branch cylinders;

5) steam is sent to DN32 branch pipelines and DN20 drain pipelines under different die tables from the branch cylinders through the delivery pipelines and the DN50 main pipeline; the DN50 steam valve and the DN20 drain valve of each model platform group are controlled by an electromagnetic valve, which model platform group needs to be subjected to steam maintenance, the master control platform opens the switch corresponding to the model platform, a signal is transmitted to the corresponding electromagnetic valve through a line I to start the DN50 steam valve and the DN20 drain valve corresponding to the model platform, and a round steam spraying hole is reserved on a DN32 branch pipeline, so that steam can be sprayed out towards different directions, the steam maintenance shed can be conveniently and quickly filled with dry steam, and the utilization efficiency of energy sources is effectively improved;

6) each module group is provided with a temperature sensing probe and a humidity high sensing probe, the measured temperature and humidity are converted into voltage signals to be input into an automatic temperature and humidity control system, the automatic temperature and humidity control system compares the input signals with a preset temperature and humidity conversion value for calculation, data signals are output to a main control console, and the main control console controls the opening and closing of a DN50 steam valve and a DN20 drain valve;

after the precast concrete member is poured, starting a resting stage; after initial setting, starting a temperature raising and constant temperature stage, and carrying out primary temperature raising, primary constant temperature, secondary temperature raising, secondary constant temperature and tertiary temperature raising; keeping the temperature constant for the third time; after the temperature raising and constant temperature stage is finished, entering a temperature lowering stage, and carrying out primary temperature lowering and secondary temperature lowering;

the steam curing process comprises the following steps of performing static curing, wherein when the temperature and the humidity in the steam curing shed do not reach a temperature value T0 and a relative humidity value H0 preset in advance by a master control console in a static curing stage, a temperature sensing probe and a humidity sensing probe (11) send signals, the signals are transmitted to an automatic adjusting system in a steam heat source machine room through a second line, the temperature and humidity automatic controlling system sends signals to an electromagnetic valve through the master control console according to the sent signals and controls a DN50 steam valve to be opened, so that the temperature is gradually increased to T0 within 2 hours, the humidity is increased to H0, when the temperature in the steam curing shed is increased to T0 and the humidity reaches H0, the temperature sensing probe and the humidity sensing probe feed back information to the automatic adjusting system, the master control console controls the DN50 steam valve to be closed, and steam transmission to the die table is stopped;

the temperature is raised for the first time, when the temperature and humidity in the steam curing shed do not reach a temperature value T1 and a relative humidity value H1 which are preset in advance by a master control console in a heating time period, the temperature sensing probe and the humidity sensing probe send signals, the signals are transmitted to an automatic adjusting system in a steam heat source machine room through a second line, the temperature and humidity automatic control system sends signals to an electromagnetic valve through the master control console according to the transmitted signals, a DN50 steam valve is controlled to be opened, so that the temperature is gradually raised to T1 and the humidity is raised to H1 within a set 1-hour time, when the temperature in the steam curing shed is raised to T1 and the humidity reaches H1, the temperature sensing probe and the humidity sensing probe feed back information to the automatic adjusting system, the master control console controls the DN50 steam valve to be closed, steam transmission to the mould table is stopped, and energy is greatly saved;

after the temperature is raised for the first time, maintaining the temperature value T1 and the relative humidity value H1 for the first time at constant temperature for 1 hour;

the temperature is raised for the second time, when the temperature and the humidity in the steam maintenance shed do not reach a temperature value T2 and a relative humidity value H2 which are preset in advance by a master control console in a heating period, the temperature sensing probe and the humidity sensing probe send signals, the signals are transmitted to an automatic adjusting system in a steam heat source machine room through a second line, the temperature and humidity automatic control system sends signals to an electromagnetic valve through the master control console according to the transmitted signals, a DN50 steam valve is controlled to be opened, the temperature is gradually raised to T2 within the set 1 hour, the humidity is raised to H2, when the temperature in the steam maintenance shed is raised to T2 and the humidity reaches H2, the temperature sensing probe and the humidity sensing probe feed back information to the automatic adjusting system, the master control console controls the DN50 steam valve to be closed, and steam transmission to the mould platform is stopped;

after the temperature is raised for the second time, maintaining the temperature value T2 and the relative humidity value H2 for the second time at constant temperature for 1 hour;

the temperature is raised for the third time, when the temperature and the humidity in the steam maintenance shed do not reach a temperature value T3 and a relative humidity value H3 which are preset in advance by a master control console in a heating time period, the temperature sensing probe and the humidity sensing probe send signals, the signals are transmitted to an automatic adjusting system in a steam heat source machine room through a second line, the temperature and humidity automatic control system sends signals to an electromagnetic valve through the master control console according to the transmitted signals and controls a DN50 steam valve to be opened, so that the temperature is gradually raised to T3 and the humidity is raised to H3 within a set 1-hour time, when the temperature in the steam maintenance shed is raised to T3 and the humidity reaches H3, the temperature sensing probe and the humidity sensing probe feed back information to the automatic adjusting system, the master control console controls the DN50 steam valve to be closed, and steam transmission to the mould platform is stopped;

after the temperature is raised for the third time, maintaining the temperature value T3 and the relative humidity value H3 for the third time at constant temperature for 1 hour;

the temperature reduction is carried out for the first time, after the temperature rise and constant temperature stage is completed, the temperature reduction stage is carried out, when the temperature and humidity reduction speed in the steam curing shed is too high and is lower than the pre-set temperature reduction time period early warning lower limit value temperature T4 and the relative humidity value H4 of the master control console, the temperature sensing probe and the humidity sensing probe can send signals to an automatic adjusting system in a steam heat source machine room through a second line, the temperature and humidity automatic controlling system sends signals to an electromagnetic valve through the master control console according to the sent signals to control a DN50 steam valve to be opened, the temperature and the humidity are raised and maintained within the set 1 hour, when the temperature in the steam curing shed rises to T4 and the humidity reaches H4, the temperature sensing probe and the humidity sensing probe can feed back information to the automatic adjusting system, the DN50 steam valve is controlled to be closed through the master control console, and steam transmission to the steam die station is stopped;

the second cooling, after the first cooling stage is finished, the second cooling stage is carried out, when the temperature and humidity in the steam curing shed is reduced too fast and is lower than the pre-warning lower limit temperature T5 and the relative humidity value H5 of the master control desk in advance in the preset cooling period, the temperature sensing probe and the humidity sensing probe send signals, the signal is transmitted to an automatic regulating system in the steam heat source machine room through a second line, the temperature and humidity automatic control system sends a signal to the electromagnetic valve through a main control desk according to the transmitted signal to control the DN50 steam valve to be opened, heating and moisturizing are carried out within the set time of 1 hour, when the temperature in the steam curing shed is raised to T5 and the humidity reaches H5, the temperature sensing probe and the humidity sensing probe can feed back information to the automatic regulating system, and (4) controlling the DN50 steam valve to be closed through the master control platform, and stopping steam transmission on the die platform.

The invention has the beneficial effects that: the invention is composed of a steam heat source machine system, a steam transmission pipeline, a mould table and a steam maintenance shed. Low cost, small occupied area and high site utilization rate. The natural gas drives the steam heat source machine to convert water into dry steam, and the dry steam is distributed to each pipeline through the steam distribution cylinder and finally enters the steam maintenance shed of the production line. Each valve on the steam transmission pipeline is respectively and independently controlled to control the module, so that the steam transmission pipeline can be produced independently or simultaneously, and energy is saved to a great extent. Even if one of the die sets is out of order and does not affect the use of the other die sets, the time required for the component to reach the expected strength can be greatly reduced. Carry out temperature and humidity control through steam maintenance canopy and humiture inductive probe in the maintenance process, not only can accurate control temperature and humidity, the control of temperature does not influence the regulation and control of humidity simultaneously, therefore the flexibility ratio of operation is high. The temperature control in the curing process comprises temperature rise and natural temperature reduction, wherein the heat preservation time of each stage is strictly controlled, a good curing effect is obtained, and finally the strength of the component is ensured to meet the specified requirement after natural temperature reduction, so that the effects of saving energy, reducing cost and improving production efficiency are achieved. Compared with the traditional production line, the invention can shorten the demolding time, improve the demolding strength and greatly improve the production efficiency. The method can be used for mass production, the produced component has no cracks on the surface, and the demolding time is short; the energy is saved, the steam maintenance shed is always kept at a constant temperature, and the utilization rate of heat energy is high. The invention realizes high-efficiency energy saving, consumption reduction, emission reduction and efficiency improvement on the premise of ensuring timely, continuous and stable supply of steam.

The steam heat source machine adopts a modular design, has the advantages of distributed nearby installation, automatic control, energy conservation, safety, easy maintenance, no need of special person on duty, no need of annual inspection and the like, and saves about 30 percent of energy compared with the comprehensive operation of the traditional steam equipment and boiler equipment.

The steam curing shed comprises a telescopic steam curing shed frame, plastic tarpaulin with good heat insulation performance and a track wheel mechanism, and the finished product is simple to manufacture, low in cost and capable of being produced in large batch; in the steam curing of the precast concrete members, the steam curing shed is in a tent shape after being unfolded, so that the concrete members needing steam curing on the movable mould platform exist in a closed space; after a steam curing environment is generated in the greenhouse, the outer side tarpaulin and the inner side tarpaulin at the end parts are tightly stuck by nylon buttons to form an airtight closed steam curing space, the heat preservation and moisture preservation effects are good, and the tarpaulin is made of airtight plastic materials, so that the energy is saved and the efficiency is high; the telescopic steam-curing shed frame of the steam-curing shed is composed of a plurality of uniformly distributed steam-curing shed frame units and folding support units connected between the steam-curing shed frame units, each steam-curing shed frame unit comprises two square steel pipe main frames and a bent square steel pipe curved beam connected between the upper ends of the two square steel pipe main frames, and sliding nodes capable of sliding up and down are arranged on each square steel pipe main frame. Each unit is detachable, convenient to assemble and suitable for die tables of various specifications or combination of a plurality of die tables; two guide rail wheels are connected below each frame unit of the steam curing shed and can be dragged and moved on most of flat ground. If the adjustable lifting device is installed on the leveling track, the adjustable lifting device can be freely folded and unfolded, and time and labor are saved; through actual measurement, the total length of a certain sample in the length direction in the unfolding state is 24m, the total length in the length direction in the contraction state can be shortened to 2m, the actual length is shortened by 92%, and the space required for storing the device when the device is not used is greatly saved.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic partial external view of the present invention;

FIG. 3 is a schematic structural diagram of a steam heat source machine room of the present invention;

FIG. 4 is a schematic view of the structure of the mold table of the present invention;

FIG. 5 is a schematic view of the construction of the conduit portion of the present invention;

FIG. 6 is a schematic structural diagram of DN32 branch pipe of the present invention;

FIG. 7 is a cross-sectional view A-A of FIG. 6;

FIG. 8 is a schematic view of the construction of a mobile vibrator of the present invention;

FIG. 9 is a schematic view of the construction of the spacer iron of the present invention;

FIG. 10 is a schematic view of a steam curing shed according to the present invention;

FIG. 11 is a schematic structural view of the retractable steam-curing shed frame in a folded state;

FIG. 12 is a schematic structural view of the retractable steam-curing shed frame of the present invention in an unfolded state;

FIG. 13 is a schematic structural view of a frame unit and a folding bracket unit of the steam curing shed according to the present invention;

FIG. 14 is a schematic view of the structure of the lower end of the frame unit and the folding bracket unit of the steam-curing shed of the present invention;

FIG. 15 is a schematic structural view of the upper end portions of the frame unit and the folding bracket unit of the steam curing canopy of the present invention;

FIG. 16 is a top plan view of the inboard tarpaulin part of the present invention;

FIG. 17 is a side view of an inboard tarpaulin part of the present invention;

FIG. 18 is a side view of the outboard tarpaulin part of the present invention.

Detailed Description

The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings:

as shown in fig. 1 and 2, the steam curing production line for precast concrete members comprises a steam heat source machine room 1, a mould table, a steam conveying pipeline 2 and a steam curing shed 8.

As shown in figure 3, a general control table 1-1, a water storage tank 1-2, a water purification machine 1-3, a water storage tank 1-4, a water feed pump 1-5, a steam heat source machine 1-6, a steam cylinder 1-7 and an automatic temperature and humidity adjusting system 1-8 are arranged in a steam heat source machine room 1, the general control table 1-1 is respectively connected with the water storage tank 1-2, the steam heat source machine 1-6, the water feed pump 1-5 and the automatic temperature and humidity adjusting system 1-8, the water storage tank 1-2 is connected with the water purification machine 1-3, the water purification machine 1-3 is connected with the water storage tank 1-4, the water storage tank 1-4 is connected with the water feed pump 1-5, the water feed pump 1-5 is connected with the steam heat source machine 1-6, the steam heat source machine 1-6 is connected with the steam cylinder 1, and a steam conveying pipeline 2 for connecting the two production lines, wherein the steam is conveyed to different die tables from the steam distribution cylinder through the steam conveying pipeline 2.

The water purifier 1-3 adopts water purifying equipment with multi-stage filter elements for water purification treatment, and adopts physical modes of filtration, adsorption and reverse osmosis. The principle of reverse osmosis is to apply a pressure higher than the natural osmotic pressure to the raw water side to cause reverse osmosis of water molecules from the higher concentration side to the lower concentration side. The aperture of the reverse osmosis membrane is far less than that of viruses and bacteria by hundreds of times or more than thousands of times, so that various viruses, bacteria, heavy metals, solid soluble substances, polluted organic substances, calcium and magnesium ions and the like cannot pass through the reverse osmosis membrane fundamentally, thereby achieving the aim of purifying water.

The steam heat source machine 1-6 overturns the working principle and the working process of the traditional steam equipment of water storage, heating, water boiling and steam generation. By applying a novel direct current steam generation technology, water flows through the combustion chamber at a high speed and is instantly converted into steam, so that the processes and links of water storage, heating and water boiling of the traditional steam equipment are reduced, and the whole process from starting to steam generation is finished in about 5 seconds. Water forcibly flows from top to bottom in the exchanger, flame burns at the bottommost part, smoke flows from bottom to top, heat is continuously transferred to water in the pipe in an exchanger and convection mode, and the water generates steam after absorbing the heat and enters the steam-water separator to be separated into high-dryness steam.

As shown in fig. 1 and 4, the die table includes 11 large die table units 5 of 4 × 12m and 12 small die table units 4 of 4 × 9m, and the total length is about 280 m. The mold comprises 10 groups of first mold groups with the length of 21m and composed of a small mold unit 4 with the length of 4 x 9m and a large mold unit 5 with the length of 4 x 12m, and 1 group of second mold groups with the length of 18m and composed of two small mold units with the length of 4 x 9m and a third mold group with the length of 4 x 12m and composed of a single large mold unit 5. The small die table unit 4 and the large die table unit 5 are identical in structure and different in length and are formed by welding a die table bottom plate 4-5 and a die table framework on the die table bottom plate. The bed bottom plate 4-5 is made of a sheet of hot rolled steel plate 10mm thick. The die table framework is formed by connecting two long frameworks 4-1, two short frameworks 4-2, evenly distributed I-shaped steel frameworks 4-3 and angle steel frameworks 4-4, the short frameworks 4-2 are connected between two ends of the two long frameworks 4-1, 15I-shaped steel frameworks 4-3 with the length of 3.8m are connected between the two long frameworks 4-1, and one corner steel framework 4-4 is connected between the middle parts of the two adjacent I-shaped steel frameworks 4-3 and between the I-shaped steel framework 4-3 and the short framework 4-2. The long framework 4-1 is made of 28a channel steel, the short framework 4-2 is made of 20a channel steel, the I-shaped steel framework 4-3 is made of 20a I-shaped steel, and the angle steel framework 4-4 is made of 10/8 hot-rolled inequilateral angle steel.

Each module group is provided with a temperature sensing probe 10 and a humidity sensing probe 11, and the temperature sensing probe 10 and the humidity sensing probe 11 are connected with an automatic temperature and humidity adjusting system 1-8 in the steam heat source machine room 1 through a second circuit 13.

Whole mould platform is sturdy and durable, and the bearing capacity is big, can pour the multiunit component simultaneously, and the size is regular, very big improvement the utilization ratio in place, it is also more convenient to clear up simultaneously.

As shown in figures 1 and 5, the steam conveying pipeline 2 is connected with a DN50 main pipeline 2-1, a DN50 main pipeline 2-1 runs through the whole production line, a DN32 branch pipeline 2-2 with the length of about 23m, preferably 23m, and a DN20 drain pipeline 2-3 with the length of about 2m, preferably 2m are arranged below each module group, and the DN32 branch pipeline 2-2 is communicated with the DN20 drain pipeline 2-3. Each branch conduit 2-2 of DN32 communicates with the main conduit 2-1 of DN 50. The junction of the DN32 branch pipe 2-2 and the DN50 main pipe 2-1 is welded, the corner of the DN32 branch pipe 2-2 is connected by a pipe connecting elbow 2-4, the corner of the DN20 drain pipe 2-3 is connected by a pipe connecting elbow 2-4, the junction of the DN32 branch pipe 2-2 and the DN20 drain pipe 2-3 is connected by a bent pipe 2-5, the horizontal height of the rear half part of the bent pipe 2-5 is reduced, and the DN20 drain pipe 2-3 can conveniently pass through the lower part of the DN50 main pipe 2-1. A DN50 steam valve 6 is arranged on a DN50 branch pipeline 2-2 under each module group, a DN20 steam trap 7 is arranged on a DN20 steam trap 2-3 under each module group, and the DN32 steam trap 6 and the DN20 steam trap 7 are respectively connected with pipelines at two sides of the two valves through a DN32 flange 6-1 and a DN20 flange 7-1. DN50 steam valve 6 and DN20 steam trap 7 of each model group are connected with a solenoid valve 3, and the solenoid valve 3 is connected with the master control board 1-1 through a line I12.

As shown in fig. 6 and 7, circular steam injection holes 2-4 with the diameter of 5mm are uniformly distributed on the DN32 branch pipe 2-2, the included angle alpha between the connecting line of the circle center of the circular steam injection holes 2-4 and the circle center of the cross section of the DN32 branch pipe 2-2 and the vertical direction is 45 degrees, the distance between the adjacent circular steam injection holes 2-4 is 1m, and the circular steam injection holes 2-4 are arranged in a crossed manner at two sides of the DN32 branch pipe 2-2, so that steam can be injected towards different directions, dry steam can be conveniently and quickly filled in the steam maintenance shed, and the utilization efficiency of energy is effectively improved.

As shown in fig. 1 and 8, the long frameworks 4-1 on two sides below the die table are provided with the movable vibrators 14, each movable vibrator 14 comprises a vibrator seat 14-5, a vibrator engine 14-1 and a vibrator 14-3 are arranged on each vibrator seat 14-5, the vibrator engine 14-1 is connected with a buckle 14-2, the lower end of each vibrator seat 14-5 is provided with a pulley 14-4, and each pulley 14-4 is connected with the vibrator engine 14-1. A track 15 is arranged below the mould table, and the pulley 14-4 is arranged on the track 15. The vibrator engine 14-1 is connected with the general control console 1-1.

As shown in fig. 2 and 9, a plurality of cushion block iron pieces 9 are arranged below each die table group to cushion the die tables to a certain height, so that the steam conveying pipeline 2 can conveniently penetrate through the lower surfaces of the die tables. The cushion block iron piece 9 consists of a cushion block bottom plate 9-1, cushion block side plates 9-3, cushion block I-steel 9-4, a cushion block top plate 9-6 and cushion block barrier strips 9-5. 4 reserved bolt holes 9-2 are arranged on the cushion block bottom plate 9-1 and are connected with the reserved holes on the ground through bolts, and the whole iron piece is fixed on the ground. The two cushion block side plates 9-3 are welded and connected to the cushion block bottom plate 9-1, and the cushion block I-shaped steel 9-4 is connected between the two cushion block side plates 9-3 to prevent the I-shaped steel 9-4 from sliding transversely. The cushion block I-steel 9-4 is movably connected with the cushion block side plate 9-3, and after the die table is leveled, the height between the cushion block I-steel 9-4 and the cushion block bottom plate 9-1 is adjusted according to the height difference and then is fixed through welding. The cushion block I-steel 9-4 is connected with a cushion block top plate 9-6, two cushion block baffle strips 9-5 are welded on the cushion block top plate 9-6, the distance between the two cushion block baffle strips 9-5 is matched with the size of the distance between the two long frameworks 4-1 of the die table, and the two cushion block baffle strips 9-5 can clamp the long frameworks 4-1 when the die table is placed, so that the die table is prevented from deviating.

As shown in figures 10-18, the steam curing shed 8 comprises a telescopic steam curing shed frame 81, plastic tarpaulin 82 with good heat insulation performance and a rail wheel mechanism 83, wherein the telescopic steam curing shed frame 81 is composed of a plurality of uniformly distributed steam curing shed frame units 81-1 and folding support units 81-2 connected between the steam curing shed frame units 81-1, each steam curing shed frame unit 81-1 comprises two square steel pipe main frames 81-1-1 and a bent square steel pipe curved beam 81-1-2 connected between the upper ends of the two square steel pipe main frames 81-1-1, and each square steel pipe main frame 81-1-1 is provided with a sliding node 81-1-3 capable of sliding up and down. The folding support unit 81-2 comprises a first folding support 81-2-1 and a second folding support 81-2-2 which are arranged in a crossed mode, the lower end of the first folding support 81-2-1 and the lower end of the second folding support 81-2-2 are connected to a sliding node 81-1-3 of the two adjacent square steel tube main frames 81-1-1 through screws respectively, and the upper end of the first folding support 81-2-1 and the upper end of the second folding support 81-2-2 are fixed to the two adjacent square steel tube main frames 81-1-1 through screws respectively. The track wheel mechanism 83 comprises two steel pipe guide rails 83-1 and a plurality of guide rail wheels 83-2 which are uniformly distributed, the lower end of each square steel pipe main frame 81-1-1 is connected with one guide rail wheel 83-2 through a screw, and the guide rail wheels 83-2 are arranged on the guide rails 83-1 and can move on the guide rails 83-1. The length of the steel pipe guide rail 83-1 can be increased or decreased according to the requirement by filling or reducing the steam curing shed frame unit 81-1.

The plastic tarpaulin 82 comprises an inner tarpaulin 82-1 and an outer tarpaulin 82-2, wherein the inner tarpaulin 82-1 is arranged at the inner side of the telescopic steam-curing shed frame 81 in the whole length, and the inner tarpaulin 82-1 is connected with the square steel tube main frame 81-1-1 and the square steel tube curved beam 81-1-2 of each steam-curing shed frame unit 81-1. The outer side tarpaulin 82-2 is arranged at two ends of the telescopic steam-curing shed frame 81, and the outer side tarpaulin 82-2 is connected with the upper parts of the square steel tube main frames 81-1-1 and the square steel tube curved beams 81-1-2 of the steam-curing shed frame units 81-1 at the two ends. The inner tarpaulin 82-1 and the outer tarpaulin 82-2 are overlapped on the square steel pipe curved beams 81-1-2 of the steam-curing shed frame unit 81-1 at the two ends, and the fixing nails are used for simultaneously fixing the inner tarpaulin 82-1 and the outer tarpaulin 82-2. The outer side tarpaulin 82-2 is movably connected with the inner side tarpaulin 82-1 through nylon buttons. The steam curing shed engine 84 is fixed on the square steel tube main frame 81-1-1 at the end part of the steam curing shed 8 through welding.

1) the steam curing production line of the precast concrete members is started and closed through a master control platform 1-1, parameter data of each curing shed are set, and the following parameters are set according to the environmental temperature T:

in the static maintenance stage, a temperature value T0 is T, a relative humidity value H0 is = 50%, T0 is greater than or equal to 5, when the environmental temperature T is lower than 5 ℃, T0 is 5, and the static maintenance time length value is 2 hours;

in the third temperature rise stage, the set temperature value T3 is T2+10, the set relative humidity value H3 is 95%, the time length value is 1 hour, T3 is more than 50 and less than 60, and temperature rise can be continuously set when the condition is not met;

the temperature value T5 is T4-10 and the relative humidity value H5 is 90% in the second cooling stage, and the time length value is 1 hour.

2) After the precast concrete component is poured, the master control platform 1-1 controls the vibrator motor 14-1 of the movable vibrator 14 to drive the pulley 14-4 to move to the bottom of the mould platform along the rail 15, and then the movable vibrator 14 is tightly clamped on the mould platform through the buckle 14-1, so that the concrete on the mould platform is sufficiently vibrated.

3) After the vibration is finished, the master control platform 1-1 controls to start the steam curing shed engine 84, the steam curing shed 8 is in a contraction state when not used, when the mould platform needs to be cured, the steam curing shed engine 8-4 is started through the master control platform 1-1 to drive the telescopic steam curing shed frame 81 to extend, the guide rail wheels 83-2 move along the guide rails 83-1, the folding support rotates around the sliding nodes on the main frame along with the gradual increase of the distance between the adjacent steam curing shed frame units, the sliding nodes sleeved on the main frame are pulled to move upwards, the unfolding of the invention is realized, and the whole product is in a tent shape after the unfolding, so that the precast concrete component needing to be cured on the movable mould platform exists in a closed space; and the outer tarpaulin and the inner tarpaulin at the end parts are tightly stuck by nylon buttons to form an airtight closed steam curing space.

4) The main control desk 1-1 controls the running water to enter the water storage tank 1-2, when the water level reaches 2/3 of the water storage tank 1-2, the running water automatically enters the water purification machine 1-3 for purification, and the purified water enters the water storage tank 1-4 for storage. The master control table 1-1 controls and starts the steam heat source machine 1-6 and the water feed pump 1-5, the water feed pump 1-5 sends the purified pure water in the water storage tank 1-4 into the steam heat source machine 1-6, the steam heat source machine 1-6 converts the pure water into high-dryness steam at high speed, and finally the steam heat source machine enters the branch cylinder 1-7.

5) Steam is sent from the cylinder to DN32 branch pipe 2-2 and DN20 drain pipe 2-3 under different die stations through the main pipe 2-1 of the delivery pipe 2 and DN 50. DN50 steam valve 6 and DN20 steam trap 7 of each module group are controlled by a solenoid valve 3, which module group needs to be steam-cured by a master control platform 1-1 to open the switch of the corresponding module, a signal is transmitted to the corresponding solenoid valve 3 through a line I12 to start the DN50 steam valve 6 and the DN20 steam trap 7 of the corresponding module, a round steam-spraying hole is left on a DN32 branch pipeline 2-2, so that steam can be sprayed towards different directions, the steam-curing shed is convenient for dry steam to be quickly filled with the steam, and the utilization efficiency of energy is effectively improved.

6) Each module group is provided with a temperature sensing probe 10 and a humidity high sensing probe 11, measured temperature and humidity are converted into voltage signals to be input into an automatic temperature and humidity control system 1-8, the automatic temperature and humidity control system 1-8 compares the input signals with preset temperature and humidity conversion values to calculate, data signals are output to a master control console 1-1, and the master control console 1-1 controls the opening and closing of a DN50 steam valve 6 and a DN20 drain valve 7.

After the precast concrete member is poured, starting a resting stage; after initial setting, starting a temperature raising and constant temperature stage, and carrying out primary temperature raising, primary constant temperature, secondary temperature raising, secondary constant temperature and tertiary temperature raising; keeping the temperature constant for the third time; and after the temperature rising and constant temperature stage is finished, entering a temperature reduction stage, and carrying out primary temperature reduction and secondary temperature reduction.

The steam curing process comprises the steps of performing static curing, when the temperature and the humidity in a steam curing shed in a mould table do not reach a temperature value T0 and a relative humidity value H0 which are preset in advance by a master control table 1-1 in a static curing stage and are 50%, sending signals by a temperature sensing probe 10 and a humidity sensing probe 11, sending the signals to an automatic adjusting system 1-8 in a steam heat source machine room 1 through a line two 13, sending signals to an electromagnetic valve 3 by the master control table 1-1 according to the sent signals by the automatic temperature and humidity controlling a DN50 steam valve 6 to be opened, gradually increasing the temperature to T0 and the humidity to H0 within 2 hours, feeding back information to the automatic adjusting system 1-8 by the temperature sensing probe 10 and the humidity sensing probe 11 when the temperature in the steam curing shed rises to T0 and the humidity reaches H0, and controlling the DN50 steam valve 6 to be closed by the master control table 1-1, the delivery of steam to the die table is stopped.

The temperature is raised for the first time, when the temperature and the humidity in the steam maintenance shed in the mould table do not reach a temperature value T1 and a relative humidity value H1 which are preset in advance by a master control table 1-1, a temperature sensing probe 10 and a humidity sensing probe 11 can send signals, the signals are transmitted to an automatic regulating system 1-8 in a steam heat source machine room 1 through a line II 13, the temperature and the humidity automatic controlling system 1-8 can send signals to an electromagnetic valve 3 through the master control table 1-1 according to the transmitted signals to control a DN50 steam valve 6 to be opened, so that the temperature is gradually raised to T1 and the humidity is raised to H1 within the set 1 hour, when the temperature in the steam maintenance shed is raised to T1 and the humidity reaches H1, the temperature sensing probe 10 and the humidity sensing probe 11 can feed back the information to the automatic regulating system 1-8, the DN50 steam valve 6 is controlled to be closed through the master control table 1-1, the steam transmission to the mould table is stopped, and the energy is greatly saved.

After the first temperature rise, the temperature value T1 and the relative humidity value H1 are maintained for the first time at constant temperature for 1 hour.

And (2) heating for the second time, when the temperature and humidity in the steam maintenance shed in the mould table do not reach a temperature value T2 and a relative humidity value H2 which are preset in advance in a heating period of time by the master control table 1-1, sending signals by the temperature sensing probe 10 and the humidity sensing probe 11, sending the signals to the automatic regulating system 1-8 in the steam heat source machine room 1 through a line II 13, sending the signals to the electromagnetic valve 3 by the master control table 1-1 according to the signals sent by the temperature and humidity automatic controlling system 1-8, controlling the DN50 steam valve 6 to be opened, gradually increasing the temperature to T2 within the set 1 hour, increasing the humidity to H2, feeding back the information to the automatic regulating system 1-8 by the temperature sensing probe 10 and the humidity sensing probe 11 when the temperature in the steam maintenance shed rises to T2 and the humidity reaches H2, controlling the DN50 steam valve 6 to be closed by the master control table 1-1, the delivery of steam to the die table is stopped.

After the second temperature rise, the temperature value T2 and the relative humidity value H2 were maintained at constant temperature for a second time for 1 hour.

Thirdly, when the temperature and humidity in the steam maintenance shed in the mould table do not reach the temperature value T3 and the relative humidity value H3 of the preset temperature-rise time period in advance of the master control table 1-1, the temperature sensing probe 10 and the humidity sensing probe 11 can send signals, the signals are transmitted to the automatic regulating system 1-8 in the steam heat source machine room 1 through a line II 13, the temperature and humidity automatic controlling system 1-8 can send signals to the electromagnetic valve 3 through the master control table 1-1 according to the transmitted signals to control the opening of the DN50 steam valve 6, so that the temperature is gradually increased to T3 and the humidity is increased to H3 within the set 1 hour, when the temperature in the steam maintenance shed is increased to T3 and the humidity reaches H3, the temperature sensing probe 10 and the humidity sensing probe 11 can feed back the information to the automatic regulating system 1-8, the DN50 steam valve 6 is controlled to be closed through the master control table 1-1, the delivery of steam to the die table is stopped.

After the third temperature rise, the temperature value T3 and the relative humidity value H3 are maintained at the constant temperature for the third time for 1 hour.

The first cooling is carried out, after the temperature raising and constant temperature stage is completed, the cooling stage is carried out, when the temperature and humidity in the steam maintenance shed in the die table is reduced too fast and is lower than the pre-set cooling time period early warning lower limit temperature T4 and the relative humidity value H4 of the master control table 1-1, the temperature sensing probe 10 and the humidity sensing probe 11 send signals to be transmitted to the automatic adjusting system 1-8 in the steam heat source machine room 1 through a circuit II 13, the temperature and humidity automatic controlling system 1-8 sends signals to the electromagnetic valve 3 through the master control table 1-1 according to the sent signals to control the DN50 steam valve 6 to be opened, the heating and the moisture preservation are carried out within the set 1 hour, when the temperature in the steam maintenance shed is raised to T4 and the humidity reaches H4, the temperature sensing probe 10 and the humidity sensing probe 11 feed back the information to the automatic adjusting system 1-8, DN50 steam valve 6 is controlled to close by the general control table 1-1, and steam transmission to the mould table is stopped.

The second cooling is carried out, after the first cooling stage is finished, the second cooling stage is carried out, when the temperature and humidity in the steam maintenance shed in the die table is too fast to be reduced to be lower than the pre-set lower warning limit temperature T5 and the relative humidity value H5 of the cooling time period in advance of the master control table 1-1, the temperature sensing probe 10 and the humidity sensing probe 11 send signals, the signals are transmitted to the automatic regulating system 1-8 in the steam heat source machine room 1 through a line II 13, the automatic temperature and humidity control system 1-8 sends signals to the electromagnetic valve 3 through the master control table 1-1 according to the signals transmitted, the DN50 steam valve 6 is controlled to be opened, the temperature and the humidity are increased and maintained within the set 1 hour, when the temperature in the steam maintenance shed is increased to T5 and the humidity reaches H5, the temperature sensing probe 10 and the humidity sensing probe 11 feed back the information to the automatic regulating system 1-8, DN50 steam valve 6 is controlled to close by the general control table 1-1, and steam transmission to the mould table is stopped.

It should be understood that parts of the specification not set forth in detail are well within the prior art. The above examples are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A precast concrete component steam curing production line comprises a steam heat source machine room (1), a mould table, a steam conveying pipeline (2) and a steam curing shed (8); it is characterized in that the preparation method is characterized in that,

a general control table (1-1), a water storage tank (1-2), a water purification machine (1-3), a water storage tank (1-4), a water feed pump (1-5), a steam heat source machine (1-6), a gas distribution cylinder (1-7) and an automatic temperature and humidity adjusting system (1-8) are arranged in the steam heat source machine room (1), the general control table (1-1) is respectively connected with the water storage tank (1-2), the steam heat source machine (1-6), the water feed pump (1-5) and the automatic temperature and humidity adjusting system (1-8), the water storage tank (1-2) is connected with the water purification machine (1-3), the water purification machine (1-3) is connected with the water storage tank (1-4), the water storage tank (1-4) is connected with the water feed pump (1-5), the water feed pump (1-5) is connected with the, the steam heat source machine (1-6) is connected with the steam distributing cylinder (1-7), two steam outlets are arranged on the steam distributing cylinder (1-7), the steam conveying pipeline (2) of two production lines is connected, and steam is conveyed to different die tables from the steam distributing cylinder (1-7) through the steam conveying pipeline (2);

the die table comprises a plurality of die table groups consisting of large die table units (5) and small die table units (4), and the small die table units (4) and the large die table units (5) are formed by welding die table bottom plates (4-5) with die table frameworks on the small die table units; the die table framework is formed by connecting two long frameworks (4-1), two short frameworks (4-2), uniformly distributed I-shaped steel frameworks (4-3) and angle steel frameworks (4-4), the short frameworks (4-2) are connected between two ends of the two long frameworks (4-1), the I-shaped steel frameworks (4-3) are connected between the two long frameworks (4-1), and the angle steel frameworks (4-4) are connected between the middle parts of the two adjacent I-shaped steel frameworks (4-3) and between the I-shaped steel frameworks (4-3) and the short frameworks (4-2); each module group is provided with a temperature sensing probe (10) and a humidity sensing probe (11), and the temperature sensing probe (10) and the humidity sensing probe (11) are connected with an automatic temperature and humidity adjusting system (1-8) in the steam heat source machine room (1) through a second circuit (13);

the steam conveying pipeline (2) is connected with a DN50 main pipeline (2-1), a DN50 main pipeline (2-1) penetrates through the whole production line, a DN32 branch pipeline (2-2) and a DN20 drain pipeline (2-3) are arranged below each module group, and the DN32 branch pipeline (2-2) is communicated with the DN20 drain pipeline (2-3); each DN32 branch pipeline (2-2) is communicated with the DN50 main pipeline (2-1); the corners of the DN32 branch pipelines (2-2) are connected by pipeline connecting elbows (2-4), the corners of the DN20 hydrophobic pipelines (2-3) are connected by pipeline connecting elbows (2-4), the junctions of the DN32 branch pipelines (2-2) and the DN20 hydrophobic pipelines (2-3) are connected by elbows (2-5), and the pipeline level of the rear half part of the elbows (2-5) is reduced; a DN50 steam valve (6) is arranged on a DN50 branch pipeline (2-2) under each module group, a DN20 drain valve (7) is arranged on a DN20 drain pipeline (2-3) under each module group, and the DN32 steam valve (6) and the DN20 drain valve (7) are respectively connected with pipelines at two sides of the two valves through a DN32 flange (6-1) and a DN20 flange (7-1); a DN50 steam valve (6) and a DN20 drain valve (7) of each module group are connected with an electromagnetic valve (3), and the electromagnetic valve (3) is connected with a master control console (1-1) through a first line (12);

circular steam injection holes (2-4) are uniformly distributed on the DN32 branch pipeline (2-2), an included angle alpha between a connecting line of the circle centers of the circular steam injection holes (2-4) and the circle center of the pipeline section of the DN32 branch pipeline (2-2) and the vertical direction is 45 degrees, the distance between the adjacent circular steam injection holes (2-4) is 1m, and the circular steam injection holes (2-4) are arranged on two sides of the DN32 branch pipeline (2-2) in a crossed manner;

a movable vibrator (14) is arranged on long frameworks (4-1) on two sides below the die table, the movable vibrator (14) comprises a vibrator seat (14-5), a vibrator engine (14-1) and a vibrator (14-3) are arranged on the vibrator seat (14-5), a buckle (14-2) is connected to the vibrator engine (14-1), a pulley (14-4) is arranged at the lower end of the vibrator seat (14-5), and the pulley (14-4) is connected with the vibrator engine (14-1); a track (15) is arranged below the mould table, and a pulley (14-4) is arranged on the track (15); the vibrator engine (14-1) is connected with the master control platform (1-1);

and a plurality of cushion block iron pieces (9) are arranged below each die table group.

2. A precast concrete member steam curing production line according to claim 1, wherein the mold blocks comprise 11 large mold block units (5) of 4 × 12m and 12 small mold block units (4) of 4 × 9m, wherein 10 sets of the first mold block group each having a length of 21m, which is composed of one small mold block unit (4) of 4 × 9m and one large mold block unit (5) of 4 × 12m, 1 set of the second mold block group having a length of 18m, which is composed of two small mold block units of 4 × 9m, and the third mold block group which is composed of one single large mold block unit (5) of 4 × 12 m; the length of the I-shaped steel skeleton (4-3) is 3.8m, and the total number is 15; the long framework (4-1) is made of 28a channel steel, the short framework (4-2) is made of 20a channel steel, the I-shaped steel framework (4-3) is made of 20a I-shaped steel, and the angle steel framework (4-4) is made of 10/8 hot-rolled inequilateral angle steel.

3. The precast concrete unit steam curing line of claim 1, wherein the DN32 branch pipe (2-2) has a length of 23m, the DN20 drain pipe (2-3) has a length of 2m, and the diameter of the circular steam jet hole (2-4) is 5 mm.

4. The steam curing production line of the precast concrete unit according to claim 1, wherein the pad iron (9) is composed of a pad bottom plate (9-1), a pad side plate (9-3), a pad i-steel (9-4), a pad top plate (9-6) and a pad barrier strip (9-5); 4 reserved bolt holes (9-2) are formed in the cushion block bottom plate (9-1), and the whole iron piece is fixed on the ground through the connection of bolts and the reserved holes on the ground; the cushion block bottom plate (9-1) is welded and connected with two cushion block side plates (9-3), and the cushion block I-shaped steel (9-4) is connected between the two cushion block side plates (9-3) to prevent the I-shaped steel (9-4) from sliding transversely; the cushion block I-shaped steel (9-4) is movably connected with the cushion block side plate (9-3), and after the die table is leveled, the height between the cushion block I-shaped steel (9-4) and the cushion block bottom plate (9-1) is adjusted according to the height difference and then is fixed through welding; the cushion block I-steel (9-4) is connected with a cushion block top plate (9-6), the cushion block top plate (9-6) is welded with two cushion block bars (9-5), the distance between the two cushion block bars (9-5) is matched with the distance between the two long frameworks (4-1) of the die table in size, and the two cushion block bars (9-5) can clamp the long frameworks (4-1) when the die table is placed.

5. The precast concrete unit steam curing production line of claim 1, the steam curing shed (8) comprises a steam curing shed frame, plastic tarpaulin (82) and a track wheel mechanism (83), the steam-curing shed is characterized in that a steam-curing shed frame is a telescopic steam-curing shed frame (81) and consists of a plurality of uniformly distributed steam-curing shed frame units (81-1) and folding bracket units (81-2) connected between the steam-curing shed frame units (81-1), each steam-curing shed frame unit (81-1) comprises two square steel pipe main frames (81-1-1) and a bent square steel pipe curved beam (81-1-2) connected between the upper ends of the two square steel pipe main frames (81-1-1), and each square steel pipe main frame (81-1-1) is provided with a sliding node (81-1-3) capable of sliding up and down; the folding support unit (81-2) comprises a first folding support (81-2-1) and a second folding support (81-2-2) which are arranged in a crossed mode, the lower end of the first folding support (81-2-1) and the lower end of the second folding support (81-2-2) are connected to sliding nodes (81-1-3) of two adjacent square steel tube main frames (81-1-1) through screws respectively, and the upper end of the first folding support (81-2-1) and the upper end of the second folding support (81-2-2) are fixed to the two adjacent square steel tube main frames (81-1-1) through screws respectively; the track wheel mechanism (83) comprises two steel pipe guide rails (83-1) and a plurality of guide rail wheels (83-2) which are uniformly distributed, the lower end of each square steel pipe main frame (81-1-1) is connected with one guide rail wheel (83-2) through a screw, and the guide rail wheels (83-2) are arranged on the guide rails (83-1).

6. The steam curing production line of precast concrete members according to claim 5, wherein the plastic tarpaulin (82) comprises an inner tarpaulin (82-1) and an outer tarpaulin (82-2), the inner tarpaulin (82-1) is arranged at the inner side of the retractable steam-curing shed frame (81) in full length, and the inner tarpaulin (82-1) is connected with the square steel tube main frame (81-1-1) and the square steel tube curved beam (81-1-2) of each steam-curing shed frame unit (81-1); the outer side tarpaulin (82-2) is arranged at two ends of the telescopic steam curing shed frame (81), and the outer side tarpaulin (82-2) is connected with the upper parts of the square steel tube main frames (81-1-1) of the steam curing shed frame units (81-1) at the two ends and the square steel tube curved beams (81-1-2); the inner side tarpaulin (82-1) and the outer side tarpaulin (82-2) are overlapped on the square steel pipe curved beams (81-1-2) of the steam-curing shed frame unit (81-1) at the two ends, and the inner side tarpaulin (82-1) and the outer side tarpaulin (82-2) are simultaneously fixed by fixing nails; the outer side tarpaulin (82-2) is movably connected with the inner side tarpaulin (82-1) through nylon buttons.

7. A steam curing production method of a precast concrete member specifically comprises the following steps:

the steam curing production line of the precast concrete member is started and closed through a master control platform (1-1), parameter data of each curing shed are set, and the following parameters are set according to the environmental temperature T:

1) in the static maintenance stage, a temperature value T0 is T, a relative humidity value H0 is 50%, T0 is more than or equal to 5, T0 is 5 when the environmental temperature T is lower than 5 ℃, and the static maintenance time value is 2 hours;

2) after the precast concrete member is poured, the master control platform (1-1) controls a vibrator engine (14-1) of the movable vibrator (14) to drive a pulley (14-4) to move to the bottom of the mould platform along a track (15), and then a buckle (14-1) tightly clamps the movable vibrator (14) on the mould platform to fully vibrate the concrete on the mould platform;

3) after the vibration is finished, the master control table (1-1) controls to start a steam curing shed engine (84), the steam curing shed (8) is in a contraction state when not used, when the mould table needs to be cured, the steam curing shed engine (8-4) is started through the master control table (1-1) to drive a telescopic steam curing shed frame (81) to extend, a guide rail wheel (83-2) moves along a guide rail (83-1), and a folding bracket rotates around a sliding node on a main frame along with the gradual increase of the distance between adjacent steam curing shed frame units, so that the sliding node sleeved on the main frame is pulled to move upwards, the expansion of the invention is realized, the whole product is in a tent shape after the expansion, and therefore, a precast concrete component needing to be cured on the movable mould table exists in a closed space; the outside tarpaulin and the inside tarpaulin at the end part are fastened by nylon buttons to form an airtight closed steam curing space;

4) the master control desk (1-1) controls tap water to enter the water storage tank (1-2), when the water level reaches 2/3 of the water storage tank (1-2), the tap water automatically enters the water purification machine (1-3) for purification, and the purified water enters the water storage tank (1-4) for storage; the master control console (1-1) controls and starts the steam heat source machine (1-6) and the water feed pump (1-5), the water feed pump (1-5) sends purified pure water in the water storage tank (1-4) into the steam heat source machine (1-6), the steam heat source machine (1-6) converts the pure water into high-dryness steam at a high speed, and finally the steam heat source machine enters the branch cylinder (1-7);

5) steam is sent to DN32 branch pipelines (2-2) and DN20 drain pipelines (2-3) under different die tables from the branch cylinders through the delivery pipelines (2) and DN50 main pipelines (2-1); the DN50 steam valve (6) and the DN20 drain valve (7) of each module group are controlled by one electromagnetic valve (3), which module group needs to be subjected to steam maintenance master control platform (1-1) to open the switch of the corresponding module, a signal is transmitted to the corresponding electromagnetic valve (3) through a line I (12) to start the DN50 steam valve (6) and the DN20 drain valve (7) of the corresponding module, and a circular steam injection hole is reserved on the DN32 branch pipeline (2-2), so that steam can be sprayed out towards different directions, the steam maintenance shed can be conveniently and quickly filled with dry steam, and the utilization efficiency of energy is effectively improved;

6) each module group is provided with a temperature sensing probe (10) and a humidity high sensing probe (11), the actually measured temperature and humidity are converted into voltage signals to be input into a temperature and humidity automatic control system (1-8), the temperature and humidity automatic control system (1-8) compares the input signals with preset temperature and humidity conversion values to calculate, data signals are output to a master control console (1-1), and the master control console (1-1) controls the opening and closing of a DN50 steam valve (6) and a DN20 drain valve (7);

the steam curing is carried out, when the temperature and the humidity in the steam curing shed do not reach the temperature value T0 and the relative humidity value H0 preset in advance by the master control table (1-1), the temperature sensing probe (10) and the humidity sensing probe (11) send signals, the signals are transmitted to the automatic adjusting system (1-8) in the steam heat source machine room (1) through the line II (13), the temperature and the humidity automatic controlling system (1-8) send signals to the electromagnetic valve (3) through the master control table (1-1) according to the transmitted signals, the DN50 steam valve (6) is controlled to be opened, so that the temperature is gradually increased to T0 and the humidity is increased to H0 within 2 hours, when the temperature in the steam curing shed is increased to T0 and the humidity reaches H0, the temperature sensing probe (10) and the humidity sensing probe (11) feed back the information to the automatic adjusting system (1-8), the master control table (1-1) controls the DN50 steam valve (6) to close, and the steam transmission to the mould table is stopped;

the temperature is raised for the first time, when the temperature and the humidity in the steam curing shed do not reach a temperature value T1 and a relative humidity value H1 preset in advance by a master control table (1-1), a temperature sensing probe (10) and a humidity sensing probe (11) send signals, the signals are transmitted to an automatic adjusting system (1-8) in a steam heat source machine room (1) through a line II (13), the temperature and the humidity automatic controlling system (1-8) send signals to an electromagnetic valve (3) through the master control table (1-1) according to the transmitted signals, a DN50 steam valve (6) is controlled to be opened, so that the temperature is gradually raised to T1 and the humidity is raised to H1 within a set 1 hour, when the temperature in the steam curing shed is raised to T1 and the humidity reaches H1, the temperature sensing probe (10) and the humidity sensing probe (11) feed back the information to the automatic adjusting system (1-8), the DN50 steam valve (6) is controlled to be closed through the master control table (1-1), and steam transmission to the die table is stopped, so that energy is greatly saved;

heating for the second time, when the temperature and the humidity in the steam curing shed do not reach a temperature value T2 and a relative humidity value H2 preset in advance by a master control table (1-1), sending signals by a temperature sensing probe (10) and a humidity sensing probe (11), sending the signals to an automatic regulating system (1-8) in a steam heat source machine room (1) through a line II (13), sending the signals to an electromagnetic valve (3) by the temperature and humidity automatic control system (1-8) according to the sent signals, controlling a DN50 steam valve (6) to be opened, gradually increasing the temperature to T2 and the humidity to H2 within the set 1 hour time, and feeding back the information to the automatic regulating system (1-8) by the temperature sensing probe (10) and the humidity sensing probe (11) after the temperature in the steam curing shed rises to T2 and the humidity reaches H2, the master control table (1-1) controls the DN50 steam valve (6) to close, and the steam transmission to the mould table is stopped;

thirdly, when the temperature and the humidity in the steam curing shed do not reach the temperature value T3 and the relative humidity value H3 preset in advance by the master control table (1-1), the temperature sensing probe (10) and the humidity sensing probe (11) send signals, the signals are transmitted to the automatic adjusting system (1-8) in the steam heat source machine room (1) through the line II (13), the temperature and the humidity automatic controlling system (1-8) send signals to the electromagnetic valve (3) through the master control table (1-1) according to the transmitted signals, the DN50 steam valve (6) is controlled to be opened, so that the temperature is gradually increased to T3 and the humidity is increased to H3 within the set 1 hour, when the temperature in the steam curing shed is increased to T3 and the humidity reaches H3, the temperature sensing probe (10) and the humidity sensing probe (11) feed back the information to the automatic adjusting system (1-8), the master control table (1-1) controls the DN50 steam valve (6) to close, and the steam transmission to the mould table is stopped;

the first temperature reduction and temperature rise constant-temperature stage is completed, the temperature reduction stage is started, when the temperature and humidity reduction speed in the steam curing shed is too high and is lower than the pre-preset temperature reduction time interval pre-warning lower limit value temperature T4 and the relative humidity value H4 of the master control console (1-1), the temperature sensing probe (10) and the humidity sensing probe (11) send signals, the signals are transmitted to the automatic regulating system (1-8) in the steam heat source machine room (1) through a circuit II (13), the temperature and humidity automatic control system (1-8) sends signals to the electromagnetic valve (3) through the master control console (1-1) according to the transmitted signals, the DN50 steam valve (6) is controlled to be opened, the temperature and moisture preservation are carried out within the set 1 hour, when the temperature in the steam curing shed rises to T4 and the humidity reaches H4, the temperature sensing probe (10) and the humidity sensing probe (11) feed back the information to the automatic regulating system (1-8), the master control table (1-1) controls the DN50 steam valve (6) to close, and the steam transmission to the mould table is stopped;

a second cooling stage, wherein the second cooling stage is carried out after the first cooling stage is finished, when the temperature and humidity in the steam curing shed is reduced too fast and is lower than the pre-set cooling time interval early warning lower limit temperature T5 and the relative humidity value H5 of the master control board (1-1), the temperature sensing probe (10) and the humidity sensing probe (11) send signals, the signals are transmitted to the automatic regulating system (1-8) in the steam heat source machine room (1) through a circuit II (13), the automatic temperature and humidity control system (1-8) sends signals to the electromagnetic valve (3) through the master control board (1-1) according to the transmitted signals, the DN50 steam valve (6) is controlled to be opened, the heating and moisturizing are carried out within the set 1 hour, when the temperature in the steam curing shed is increased to T5 and the humidity reaches H5, the temperature sensing probe (10) and the humidity sensing probe (11) feed back the information to the automatic regulating system (1-8), and the master control table (1-1) controls the DN50 steam valve (6) to close, and the steam transmission to the die table is stopped.