CN108681343B - Sand box unloading automatic control system and construction method - Google Patents
Sand box unloading automatic control system and construction method Download PDFInfo
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- CN108681343B CN108681343B CN201810354370.3A CN201810354370A CN108681343B CN 108681343 B CN108681343 B CN 108681343B CN 201810354370 A CN201810354370 A CN 201810354370A CN 108681343 B CN108681343 B CN 108681343B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D7/00—Control of flow
- G05D7/06—Control of flow characterised by the use of electric means
- G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials
- G05D7/0629—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means
- G05D7/0676—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means by action on flow sources
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D13/00—Control of linear speed; Control of angular speed; Control of acceleration or deceleration, e.g. of a prime mover
- G05D13/62—Control of linear speed; Control of angular speed; Control of acceleration or deceleration, e.g. of a prime mover characterised by the use of electric means, e.g. use of a tachometric dynamo, use of a transducer converting an electric value into a displacement
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Abstract
The invention relates to a sand box unloading automatic control system and a construction method, comprising a sand box, an electric control system and a computer control system; a sensor is additionally arranged on the basis of the traditional sand box unloading device, so that the unloading condition of the sand box in the unloading process is monitored in real time; automatically analyzing the monitoring data through a computer, and automatically adjusting the unloading speed of the sand box by a motor according to the analysis result; the unloading device has the advantages of fine unloading speed control, good synchronism control, high automation degree, convenience in operation and the like.
Description
Technical Field
The invention relates to the field of buildings, in particular to a sand box unloading automatic control system and a construction method.
Background
The temporary support is usually required to be arranged in the installation process of the large-span space steel structure as a support in the structure forming process, and the temporary support is required to be unloaded after the construction is finished, namely, the temporary support and the structure are jointly stressed to be completely stressed. If the load transfer is too sudden and unreasonable in the unloading process, the instability and even damage of the structure or the supporting system can be caused, so that the unloading process is ensured to be smooth and safe by utilizing a reasonable unloading device.
Currently, the unloading devices commonly used have screw jacks, sand boxes and hydraulic jacks. The screw jack is usually only suitable for the engineering with smaller unloading capacity, and in the unloading of some large-span and heavy steel structures, the hydraulic jack or the sand box with larger bearing capacity is usually required for unloading. The hydraulic jack unloading method is controlled by a computer, has the characteristic of good synchronism, but has high cost, complex working procedures of lapping and checking hydraulic oil pipes during construction and low working efficiency; the traditional sand box unloading has the characteristics of high bearing capacity and low cost, but the unloading speed is controlled by manually adjusting a sand discharge port valve of the sand box, so that the unloading speed is difficult to control, and the synchronism among independent supporting points is difficult to guarantee.
Disclosure of Invention
The invention aims to overcome the defects of the traditional sand box unloading method and provides an automatic control system for sand box unloading and a construction method. The system is additionally provided with a sensor on the basis of the traditional sand box, so that the unloading condition of the sand box in the unloading process is monitored in real time; the monitoring data is automatically analyzed through a computer, and the unloading speed of the sand box is automatically adjusted through a motor; the unloading device has the advantages of fine unloading speed control, good synchronism control, high automation degree, convenience in operation and the like. In addition, a method for unloading by using the automatic control system for unloading the sand box is also provided.
In order to achieve the purpose, the invention specifically discloses a technical scheme that: an automatic control system for unloading a sand box comprises the sand box, an electric control system and a computer control system.
The sand box comprises an upper section of thick bamboo, a lower section of thick bamboo, dry sand, electronic sand discharge valve: the upper section of the cylinder is nested in the lower section of the cylinder, and the outer wall of the upper section of the cylinder is tightly attached to the inner wall of the lower section of the cylinder; the lower section of the cylinder is filled with dry sand, and the bottom of the cylinder body is provided with a sand discharge pipe; the electric sand discharge valve consists of a sand discharge pipe, a valve strip and a small-sized motor.
The electric control system comprises a master control box, a sensor, a sensing monitoring circuit, a driving circuit, a control bus, a power supply and distribution circuit: the sensor is arranged on the outer wall of the sand box, comprises a pull rope deformation sensor and a support counterforce sensor, and monitors the unloading condition of the sand box in real time, wherein the unloading condition comprises an unloading amount S and a bearing force F; the unloading condition data monitored and collected by the sensor is transmitted to the master control box through the sensing monitoring circuit and then transmitted to the computer control system through the control bus.
The computer control system carries out real-time data processing and analysis on the unloading condition data of the sand box acquired by the electrical system, and respectively compares the unloading amount S and the supporting force F with a preset unloading amount S 'and a preset supporting force F': the unloading amount S minus the predetermined unloading amount S' is used as the actual unloading amount deviationSThe support force F minus the preset support force F' is used as the actual load-bearing force deviationFWhen the actual deviation isS、∆FΔ exceeding the preset allowable deviationS’、∆FWhen the load is not available, and a command signal A for accelerating the load unloading or a command signal B for slowing the load unloading is sent out; when actual deviation isS、∆FAt preset allowable deviationS’、∆FWithin the range, a command signal C is issued to maintain the original speed. The command signal passes through the drive circuitAnd transferred to the flask.
Further, after the sand box receives the instruction signal, the small motor of the electric sand discharge valve drives the valve strip to move forward or backward to change the size of the effective sand discharge opening of the sand discharge pipe and adjust the sand discharge flow; when receiving the command signal A for accelerating unloading, the small motor drives the valve strip to retreat, and the area of an effective sand discharge opening of the sand discharge pipe is increased, so that the sand discharge flow is increased; when receiving the command signal B for slowing down unloading, the small motor drives the valve strip to move forward, so that the area of an effective sand discharge opening of the sand discharge pipe is reduced, and the sand discharge flow is reduced; when receiving the command signal C for maintaining the original speed, the small-sized motor does not drive the valve strip to move forward or backward, and the original effective sand discharging opening area is kept.
Further, the small-sized motor of the electric sand discharge valve can be driven by a low-voltage alternating current power supply wire or driven by using a battery.
Further, the data monitored by the sensor are transmitted to the master control box every 0.2-1 second.
Further, the data monitored by the sensor is transmitted to a master control box through the sensing monitoring circuit, or is transmitted to the master control box in a wireless signal mode; and the command signal is transmitted to the sand box cluster through a driving circuit of the electric control system, or is transmitted to the sand box cluster in a wireless signal mode.
Further, the preset unloading amount S 'and the preset supporting force F' of the sand box are preset through calculation and analysis before construction; and presetting the time T of each unloading process or the whole unloading process, and determining a curve of the preset unloading amount S '-T and a curve of the preset supporting force F' -T.
Further, the allowable deviation S and F ' are preset before construction through calculation and analysis, and the set principle is that when the deviation of the actual unloading amount S or the actual bearing force F and the preset unloading amount S ' or the preset bearing force F ' reaches S ' or F ' in the unloading process, the structure and the temporary support are still in a safe and controllable state, and certain safe margin can be set according to the condition of the unloading structure.
Further, the computer control system adopts the control of the unloading amount S as the main part and the support force F as the auxiliary part when performing real-time data processing and analysis on the unloading amount S and the support force F; depending on the unloading configuration, only the unloading amount S or only the supporting force F may be controlled, or the supporting force F may be controlled mainly and the unloading amount S may be controlled secondarily.
The sand box unloading construction method is characterized by comprising the following steps:
firstly, before construction, the unloading process of the structure is calculated and analyzed by utilizing calculation software, and the unloading batch grading sequence of each unloading point and the preset unloading time T of each sand box are determinediPredetermined unloading amount Si’-TiCurved, predetermined support force Fi’-TiMargin of allowable unloading amountSi', allowable bearing force biasFi’；
Secondly, mounting a sand box cluster at a preset unloading point during structure mounting;
thirdly, after the structure is installed and accepted, installing a stay cord deformation sensor and a support counter-force sensor on the sand box, connecting a sensing monitoring circuit, a driving circuit, a master control box, a control bus, a control computer, a power supply and a distribution circuit, and performing linkage debugging;
fourthly, unloading the sand box cluster according to a preset unloading sequence;
fifthly, the pull rope deformation sensor and the support counterforce sensor start to monitor the unloading amount S of each sand boxiAnd a supporting force FiRespectively transmitting the monitored and collected unloading condition data to a master control box according to a set frequency;
sixthly, the master control box collects the unloading condition data of each sand box and transmits the data to the computer control system through a control bus;
seventhly, the computer control system carries out real-time data processing and analysis on the unloading condition data of each sand box: when the instantaneous unloading amount S of the sand box iiOr supporting force FiIs at a predetermined unloading amount Si’-TiCurve or predetermined supporting force Fi’-TiWhen the curve deviates from the area A, a finger for accelerating unloading is sentLet signal Ai(ii) a When the instantaneous unloading amount S of the sand box iiOr supporting force FiIs at a predetermined unloading amount Si’-TiCurve or predetermined supporting force Fi’-TiWhen the curve deviates from the region B, a command signal B for slowing down unloading is senti(ii) a When the instantaneous unloading amount S of the sand box iiOr supporting force FiIs at a predetermined unloading amount Si’-TiCurve or predetermined supporting force Fi’-TiWhen the curve is in the normal region C, a command signal C for maintaining the original speed is senti。
Eighthly, transmitting the command signal to the sand box i through a driving circuit of the electrical system;
ninthly, after the sand box receives the instruction signal, the small-sized motor of the electric sand discharge valve starts to drive the valve strip to advance or retreat to change the size of the effective sand discharge opening of the sand discharge pipe, and the sand discharge flow is adjusted: when receiving the instruction signal AiWhen the sand discharging valve is used, the small motor of the electric sand discharging valve drives the valve strip to retreat, so that the area of an effective sand discharging opening of the sand discharging pipe is increased, and the sand discharging flow is increased; when receiving the instruction signal BiWhen the sand discharge pipe is used, the valve strip is driven by the small motor to move forward, so that the area of an effective sand discharge opening of the sand discharge pipe is reduced, and the sand discharge flow is reduced; when receiving the command signal CiWhen the valve rod is driven by the small-sized motor, the valve rod is not driven by the small-sized motor to move forwards or backwards.
And step ten, repeating the steps 7 to 9 until the unloading is finished.
In a word, the invention has the advantages of fine unloading speed control, good synchronism control, high automation degree, convenient operation and the like.
Figures and description
FIG. 1 is a schematic view of an automatic control system for unloading flasks, according to the present invention;
FIG. 2 is a schematic view showing the construction of the flask and the sensor according to the present invention;
FIG. 3 is a drawing of the predetermined unload amount S according to the present inventioni’-TiMargin of curve and allowable unloading amountSi' schematic view;
FIG. 4 is a diagram of the inventive patent instituteThe predetermined supporting force Fi’-TiCurve and allowable bearing force biasFi' schematic view.
Detailed Description
An automatic control system for unloading a sand box comprises the sand box, an electric control system and a computer control system;
the sand box comprises an upper section of thick bamboo 1, a lower section of thick bamboo 2, dry sand 3, electronic sand discharge valve 5: the upper section of the tube 1 and the lower section of the tube 2 are both cylinders, the upper section of the tube 1 is nested in the lower section of the tube 2, and the outer wall of the upper section of the tube 1 is tightly attached to the inner wall of the lower section of the tube 2; the lower section of the barrel 2 is filled with dry sand 3, and the bottom of the barrel body is provided with a sand discharge pipe 4; the upper section of tube 1 extrudes and discharges dry sand 3 in the lower section of tube 2 through a sand discharge pipe 4 and the electric sand discharge valve 5 under the action of structural pressure supported by the upper part of the upper section of tube, and the upper section of tube 1 descends gently, so that structural unloading is completed; the electric sand discharge valve 5 consists of a sand discharge pipe 4, a valve strip 51 and a small motor 52, and the small motor 52 drives the valve strip 51 to move forward or backward to change the size of an effective sand discharge opening of the sand discharge pipe 4, so that the sand discharge flow and the unloading speed are controlled.
The flask is arranged at a predetermined unloading point position, supports the upper structure during the structure mounting process, and transfers the upper mounting structure load to the lower support structure; after the installation is finished, the command signal of the electrical system is received, the unloading operation is executed through sand discharge, and the sand discharge speed is automatically adjusted by the motor according to the command signal, so that the aim of synchronous work is fulfilled.
The electric control system comprises a master control box, a sensor, a sensing monitoring circuit, a driving circuit, a control bus, a power supply and distribution circuit: the sensor is arranged on the outer wall of the sand box, comprises a pull rope deformation sensor 6 and a support counterforce sensor 7, and monitors the unloading condition of the sand box in real time, wherein the unloading condition comprises an unloading amount S and a bearing force F; the unloading condition data monitored and collected by the sensor is transmitted to the master control box through the sensing monitoring circuit and then transmitted to the computer control system through the control bus.
The computer control system processes and analyzes the unloading condition data of the sand box acquired by the electrical system in real time, and respectively compares the unloading amount S and the supporting force F with preset unloading amount S' and preset unloading amount FThe predetermined support force F' is compared: the unloading amount S minus the predetermined unloading amount S' is used as the actual unloading amount deviationSThe support force F minus the preset support force F' is used as the actual load-bearing force deviationFWhen the actual deviation isS、∆FΔ exceeding the preset allowable deviationS’、∆FWhen the load is not available, and a command signal A for accelerating the load unloading or a command signal B for slowing the load unloading is sent out; when actual deviation isS、∆FAt preset allowable deviationS’、∆FWithin the range, a command signal C is issued to maintain the original speed.
The command signal is transmitted to the sand box through a driving circuit of the electric system.
After the sand box receives the instruction signal, the small-sized motor of the electric sand discharge valve drives the valve strip to advance or retreat to change the size of the effective sand discharge opening of the sand discharge pipe, and the sand discharge flow is regulated, so that the unloading amount is controlled within an allowable range: when receiving the command signal A for accelerating unloading, the small motor drives the valve strip to retreat, and the area of an effective sand discharge opening of the sand discharge pipe is increased, so that the sand discharge flow is increased; when receiving the command signal B for slowing down unloading, the small motor drives the valve strip to move forward, so that the area of an effective sand discharge opening of the sand discharge pipe is reduced, and the sand discharge flow is reduced; when receiving the command signal C for maintaining the original speed, the small-sized motor does not drive the valve strip to move forward or backward, and the original effective sand discharging opening area is kept.
(2) A plurality of technical features in the above technical solution can be optimized respectively:
the automatic control system for unloading the sand box can be suitable for a single sand box unloading system with only one unloading point and can also be suitable for a sand box cluster unloading system under the condition that a plurality of unloading points exist simultaneously.
The small motor of the electric sand discharge valve of the sand box can be driven by a low-voltage alternating current power supply wire, and can also be driven by a battery.
The data monitored by the sensors can be transmitted to the master control box at intervals of 0.2-1 second, and the interval time can be set according to the condition of the unloading structure.
The data monitored by the sensor can be transmitted to the master control box through the sensing monitoring circuit and also can be transmitted to the master control box through a wireless signal form.
The command signal can be transmitted to the sand box cluster through a driving circuit of the electric control system, and can also be transmitted to the sand box cluster in a wireless signal mode.
The preset unloading amount S 'and the preset supporting force F' of the sand box are preset through calculation and analysis before construction, and the preset principle is to ensure the smooth and safe unloading process. Meanwhile, the time T of each unloading process or the whole unloading process can be preset, and a curve of the preset unloading amount S '-T and a curve of the preset supporting force F' -T are determined.
The allowable deviationS’、∆F' preset by calculation and analysis before construction, and the set principle is that when the deviation between the actual unloading amount S or the actual supporting force F and the preset unloading amount S ' or the preset supporting force F ' reaches Δ in the unloading processS' or ΔFIn the meantime, the structure and the temporary support are still in a safe and controllable state, and a certain safety margin is provided, and the safety margin can be set according to the condition of unloading the structure.
The computer control system mainly controls the unloading amount S and assists the supporting force F when performing real-time data processing and analysis on the unloading amount S and the supporting force F. Depending on the unloading configuration, only the unloading amount S or only the supporting force F may be controlled, or the supporting force F may be controlled mainly and the unloading amount S may be controlled secondarily.
The invention relates to an automatic control system of a sand box unloading device and an unloading construction method, which are characterized by comprising the following steps:
1. before construction, the unloading process of the structure is calculated and analyzed by using calculation software, and the unloading batch grading sequence of each unloading point and the preset unloading time T of each sand box are determinediPredetermined unloading amount Si’-TiCurved, predetermined support force Fi’-TiMargin of allowable unloading amountSi', allowable bearing force biasFi’；
2. When the structure is installed, the sand box cluster is installed at a preset unloading point;
3. after the structure is installed and accepted, a stay cord deformation sensor and a support counter-force sensor are installed on the sand box, a sensing monitoring circuit, a driving circuit, a master control box, a control bus, a control computer, a power supply and distribution circuit are connected, and linkage debugging is performed;
4. unloading the sand box cluster according to a preset unloading sequence;
5. the pull rope deformation sensor and the support counterforce sensor start to monitor the unloading amount S of each sand boxiAnd a supporting force FiRespectively transmitting the monitored and collected unloading condition data to a master control box according to a set frequency;
6. the master control box collects the unloading condition data of each sand box and transmits the data to the computer control system through the control bus;
7. the computer control system carries out real-time data processing and analysis on the unloading condition data of each sand box: when the instantaneous unloading amount S of the sand box iiOr supporting force FiIs at a predetermined unloading amount Si’-TiCurve or predetermined supporting force Fi’-TiWhen the curve deviates from the area A, a command signal A for accelerating unloading is senti(ii) a When the instantaneous unloading amount S of the sand box iiOr supporting force FiIs at a predetermined unloading amount Si’-TiCurve or predetermined supporting force Fi’-TiWhen the curve deviates from the region B, a command signal B for slowing down unloading is senti(ii) a When the instantaneous unloading amount S of the sand box iiOr supporting force FiIs at a predetermined unloading amount Si’-TiCurve or predetermined supporting force Fi’-TiWhen the curve is in the normal region C, a command signal C for maintaining the original speed is senti。
8. The command signal is transmitted to the sand box i through a driving circuit of the electrical system;
9. after the sand box receives the instruction signal, the small-sized motor of the electric sand discharge valve starts to drive the valve strip to move forwards or backwards to change the effective sand discharge opening of the sand discharge pipeAdjusting the sand discharge flow: when receiving the instruction signal AiWhen the sand discharging valve is used, the small motor of the electric sand discharging valve drives the valve strip to retreat, so that the area of an effective sand discharging opening of the sand discharging pipe is increased, and the sand discharging flow is increased; when receiving the instruction signal BiWhen the sand discharge pipe is used, the valve strip is driven by the small motor to move forward, so that the area of an effective sand discharge opening of the sand discharge pipe is reduced, and the sand discharge flow is reduced; when receiving the command signal CiWhen the valve rod is driven by the small-sized motor, the valve rod is not driven by the small-sized motor to move forwards or backwards.
10. Repeating the steps 7 to 9 until the unloading is finished.
Claims (9)
1. The utility model provides a sand box uninstallation automatic control system which characterized in that: comprises a sand box, an electrical control system and a computer control system; the sand box comprises an upper section of thick bamboo, a lower section of thick bamboo, dry sand, electronic sand discharge valve: the upper section of the cylinder is nested in the lower section of the cylinder, and the outer wall of the upper section of the cylinder is tightly attached to the inner wall of the lower section of the cylinder; the lower section of the cylinder is filled with dry sand, and the bottom of the cylinder body is provided with a sand discharge pipe;
the electric control system comprises a master control box, a sensor, a sensing monitoring circuit, a driving circuit, a control bus, a power supply and distribution circuit: the sensor is arranged on the outer wall of the sand box, comprises a pull rope deformation sensor and a support counterforce sensor, and monitors the unloading condition of the sand box in real time, wherein the unloading condition comprises an unloading amount S and a bearing force F; unloading condition data monitored and collected by the sensor is transmitted to the master control box through the sensing monitoring circuit and then transmitted to the computer control system through the control bus;
the computer control system carries out real-time data processing and analysis on the unloading condition data of the sand box acquired by the electric control system, and respectively compares the unloading amount S and the supporting force F with a preset unloading amount S 'and a preset supporting force F': the unloading amount S minus the predetermined unloading amount S' is used as the actual unloading amount deviationSThe support force F minus the preset support force F' is used as the actual load-bearing force deviationFWhen the actual deviation isS、∆FΔ exceeding the preset allowable deviationS’、∆FWhen the load is not available, and a command signal A for accelerating the load unloading or a command signal B for slowing the load unloading is sent out; all right fruitsMargin errorS、∆FAt preset allowable deviationS’、∆FWithin the range, a command signal C is issued to maintain the original speed.
2. The automatic control system for unloading the sand box according to claim 1, wherein: the electric sand discharge valve consists of a sand discharge pipe, a valve strip and a small motor, and after the sand box receives the instruction signal, the small motor of the electric sand discharge valve drives the valve strip to move forward or backward to change the size of an effective sand discharge opening of the sand discharge pipe and adjust the sand discharge flow; when receiving the command signal A for accelerating unloading, the small motor drives the valve strip to retreat, and the area of an effective sand discharge opening of the sand discharge pipe is increased, so that the sand discharge flow is increased; when receiving the command signal B for slowing down unloading, the small motor drives the valve strip to move forward, so that the area of an effective sand discharge opening of the sand discharge pipe is reduced, and the sand discharge flow is reduced; when receiving the command signal C for maintaining the original speed, the small-sized motor does not drive the valve strip to move forward or backward, and the original effective sand discharging opening area is kept.
3. The automatic control system for unloading the sand box according to claim 2, wherein: the small motor of the electric sand discharge valve can be driven by low-voltage alternating current power supply wiring or battery power.
4. The automatic control system for unloading the sand box according to claim 1, wherein: and the data monitored by the sensor is transmitted to the master control box every 0.2-1 second.
5. The automatic control system for unloading the sand box according to claim 1, wherein: the data monitored by the sensor is transmitted to a master control box through the sensing monitoring circuit or transmitted to the master control box in a wireless signal mode; and the command signal is transmitted to the sand box cluster through a driving circuit of the electric control system, or is transmitted to the sand box cluster in a wireless signal mode.
6. The automatic control system for unloading the sand box according to claim 1, wherein: the preset unloading amount S 'and the preset supporting force F' of the sand box are preset through calculation and analysis before construction; and presetting the time T of each unloading process or the whole unloading process, and determining a curve of the preset unloading amount S '-T and a curve of the preset supporting force F' -T.
7. The automatic control system for unloading the sand box according to claim 1, wherein: allowable deviationS’、∆F' preset by calculation and analysis before construction, the deviation of the actual unloading amount S and the actual supporting force F from the preset unloading amount S ' and the preset supporting force F ' is Δ during the unloading processS’、∆F' in.
8. The automatic control system for unloading the sand box according to claim 1, wherein: the computer control system adopts a method of mainly controlling the unloading amount S and secondarily controlling the supporting force F when performing real-time data processing and analysis on the unloading amount S and the supporting force F; depending on the case of the unloading structure, only the unloading amount S or only the supporting force F is controlled, or a method of mainly controlling the supporting force F and secondarily controlling the unloading amount S is adopted.
9. The sand box unloading construction method is characterized by comprising the following steps:
firstly, before construction, the unloading process of the structure is calculated and analyzed by utilizing calculation software, and the unloading batch grading sequence of each unloading point and the preset unloading time T of each sand box are determinediPredetermined unloading amount Si’-TiCurved, predetermined support force Fi’-TiMargin of allowable unloading amountSi', allowable bearing force biasFi’；
Secondly, mounting a sand box cluster at a preset unloading point during structure mounting;
thirdly, after the structure is installed and accepted, installing a stay cord deformation sensor and a support counter-force sensor on the sand box, connecting a sensing monitoring circuit, a driving circuit, a master control box, a control bus, a control computer, a power supply and a distribution circuit, and performing linkage debugging;
fourthly, unloading the sand box cluster according to a preset unloading sequence;
fifthly, the pull rope deformation sensor and the support counterforce sensor start to monitor the unloading amount S of each sand boxiAnd a supporting force FiRespectively transmitting the monitored and collected unloading condition data to a master control box according to a set frequency;
sixthly, the master control box collects the unloading condition data of each sand box and transmits the data to the computer control system through a control bus;
seventhly, the computer control system carries out real-time data processing and analysis on the unloading condition data of each sand box: when the instantaneous unloading amount S of the sand box iiOr supporting force FiIs at a predetermined unloading amount Si’-TiCurve or predetermined supporting force Fi’-TiWhen the curve deviates from the area A, a command signal A for accelerating unloading is senti(ii) a When the instantaneous unloading amount S of the sand box iiOr supporting force FiIs at a predetermined unloading amount Si’-TiCurve or predetermined supporting force Fi’-TiWhen the curve deviates from the region B, a command signal B for slowing down unloading is senti(ii) a When the instantaneous unloading amount S of the sand box iiOr supporting force FiIs at a predetermined unloading amount Si’-TiCurve or predetermined supporting force Fi’-TiWhen the curve is in the normal region C, a command signal C for maintaining the original speed is senti；
Eighthly, transmitting the command signal to the sand box i through a driving circuit of the electric control system;
ninthly, after the sand box receives the instruction signal, the small-sized motor of the electric sand discharge valve starts to drive the valve strip to advance or retreat to change the size of the effective sand discharge opening of the sand discharge pipe, and the sand discharge flow is adjusted: when receiving the instruction signal AiWhen the sand discharging valve is used, the small motor of the electric sand discharging valve drives the valve strip to retreat, so that the area of an effective sand discharging opening of the sand discharging pipe is increased, and the sand discharging flow is increased; when in useReceiving an instruction signal BiWhen the sand discharge pipe is used, the valve strip is driven by the small motor to move forward, so that the area of an effective sand discharge opening of the sand discharge pipe is reduced, and the sand discharge flow is reduced; when receiving the command signal CiWhen the valve rod is driven by the small motor to move forwards or backwards;
and tenthly, repeating the seven to nine steps until unloading is finished.
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