CN114233599A - Concrete pumping machine and control method for preventing pipe blockage thereof - Google Patents
Concrete pumping machine and control method for preventing pipe blockage thereof Download PDFInfo
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- CN114233599A CN114233599A CN202111410219.5A CN202111410219A CN114233599A CN 114233599 A CN114233599 A CN 114233599A CN 202111410219 A CN202111410219 A CN 202111410219A CN 114233599 A CN114233599 A CN 114233599A
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- 238000005086 pumping Methods 0.000 title claims abstract description 221
- 238000000034 method Methods 0.000 title claims abstract description 51
- 230000007246 mechanism Effects 0.000 claims abstract description 49
- 230000009471 action Effects 0.000 claims abstract description 9
- 238000006073 displacement reaction Methods 0.000 claims description 305
- 230000008859 change Effects 0.000 claims description 42
- 239000000463 material Substances 0.000 claims description 25
- 230000008569 process Effects 0.000 claims description 19
- 230000002441 reversible effect Effects 0.000 claims description 13
- 230000002829 reductive effect Effects 0.000 claims description 12
- 238000012544 monitoring process Methods 0.000 claims description 9
- 230000001276 controlling effect Effects 0.000 description 11
- 230000002265 prevention Effects 0.000 description 10
- 238000005204 segregation Methods 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 4
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
- 208000024891 symptom Diseases 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04B15/02—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/26—Control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- F04B17/05—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by internal-combustion engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/02—Stopping, starting, unloading or idling control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/08—Regulating by delivery pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/20—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by changing the driving speed
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- Engineering & Computer Science (AREA)
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- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention provides a concrete pumping machine and a control method for preventing pipe blockage thereof, which can effectively prevent pipe blockage. The concrete pumping machine comprises a main pump, a controller, an engine and a variable mechanism; the main pump is used for converting the power of the engine into hydraulic power so as to convey concrete; the execution end of the variable mechanism is connected with a main pump and is used for controlling and adjusting the real-time discharge capacity of the main pump; the engine is connected with the main pump and is used for supplying power for the operation of the main pump; the controller is respectively connected with the variable mechanism and the engine and used for acquiring the operation parameters of the concrete pumping machine in real time and controlling the action of the engine and the variable mechanism according to the operation parameters so as to prevent or reduce pipe blockage.
Description
Technical Field
The invention belongs to the technical field of concrete pumping, and particularly relates to a concrete pumping machine and a control method for preventing pipe blockage.
Background
Concrete pumping machinery is an engineering machinery which utilizes pressure to convey pre-stirred concrete to a certain height and distance along a distribution pipeline, and is widely applied to modern building engineering. The controller is a key device for normal operation of the concrete pumping machine, is equivalent to a control center of the concrete pumping machine, and controls the displacement and the engine speed in the whole pumping operation process. Under normal conditions, the highest value of the pumping oil pressure cannot reach the set pressure, if the pressure peak value of each pumping stroke rapidly rises along with the alternation of the strokes and reaches the set pressure rapidly, the normal pumping circulation automatically stops, and the overflow sound of the overflow valve of the main oil way indicates that pipe blockage occurs.
Generally, there are five measures to prevent pipe blockage:
firstly, a pumper needs to concentrate on pumping construction, constantly pay attention to the reading of a pumping pressure gauge, once the reading of the pressure gauge is suddenly increased, the pumper needs to immediately reverse the pump for 2-3 strokes, and then the pumper is positively pumped, and pipe blockage can be eliminated;
secondly, when pipe blockage symptoms occur or the slump of a certain car of concrete is small, pumping at a low speed is needed to eliminate the pipe blockage in a sprouting state;
thirdly, the materials in the hopper cannot be piled too much and should be lower than the protective fence so as to clean the coarse aggregate and the oversized aggregate in time;
fourthly, when the slump of concrete of a certain car is smaller, the excess material can be lower than the stirring shaft and controlled above the S pipe or the suction inlet so as to reduce the stirring resistance, the swing resistance and the suction resistance;
fifthly, when the slump of one bucket of concrete is found to be very small and the concrete cannot be pumped, the concrete should be timely discharged from the bottom of the hopper.
The prior art belongs to manual judgment and operation, is highly dependent on the experience of an operator, and has great instability. People are required to pay attention to the pumping pressure at any moment and listen to the pumping sound, and once the attention is not focused, the abnormal rise of the wrong pressure is caused, the serious condition of pipe blockage is easily caused, and even the conveying pipe is blocked. Inexperienced people, improper operation not only can not prevent stifled pipe, can cause stifled pipe more serious or stifled pipe probability higher on the contrary.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a concrete pumping machine and a control method for preventing pipe blockage thereof, which can effectively prevent pipe blockage.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
in a first aspect, the present invention provides a concrete pumping machine, comprising a main pump, a controller, an engine and a variable mechanism;
the main pump is used for converting the power of the engine into hydraulic power so as to convey concrete;
the execution end of the variable mechanism is connected with a main pump and is used for controlling and adjusting the real-time discharge capacity of the main pump;
the engine is connected with the main pump and is used for supplying power for the operation of the main pump;
the controller is respectively connected with the variable mechanism and the engine and used for acquiring the operation parameters of the concrete pumping machine in real time, controlling the action of the engine and the variable mechanism according to the operation parameters and adjusting the real-time rotating speed of the engine and the real-time discharge capacity of the main pump.
Further, the operating parameter includes a state of a pumping switch;
the input end of the controller is connected with a pumping switch for controlling the pumping start and stop; a timing device is arranged in the controller and used for calculating and acquiring pumping stop time according to the state of the pumping switch;
the controller is connected with the engine to control and adjust the real-time rotating speed of the engine; the controller is connected with the variable mechanism to control and adjust the real-time discharge capacity of the main pump;
when the pumping stop time exceeds the preset material waiting time and the pumping is started again, the controller enters a pipe passing mode, and the pipe passing mode is as follows: the controller controls the engine to adjust the real-time rotating speed to a first target rotating speed and controls the variable mechanism to adjust the real-time discharge capacity of the main pump to be the discharge capacity of the through pipe, and the process lasts for a preset through pipe reversing period; after the pipe communicating mode is executed, the controller automatically exits the pipe communicating mode and enters a normal pumping mode, and the controller adjusts the real-time displacement of the main pump to be a set displacement; and in the material waiting process, if a pump worker manually operates the reverse pump, recalculating the pumping stop time, and restarting to calculate the pumping stop time when the reverse pump is finished.
The input of the set displacement comprises that the controller is connected with a remote controller, the remote controller is provided with a displacement adjusting knob, and the displacement adjusting knob is used for inputting the set displacement;
further, the operating parameters further include a pumping pressure;
the delivery end of the main pump is provided with a pressure sensor, and the pressure sensor is connected with the input end of the controller to deliver the pumping pressure of the main pump to the controller;
the controller enters an anti-blocking pipe mode according to the pumping pressure and the set displacement; in the pipe blockage prevention mode, the controller adjusts the real-time rotating speed of the engine and the real-time discharge capacity of the main pump according to preset logic;
the controller continuously monitors the pumping pressure, if the pumping pressure is less than or equal to 250bar and the duration time exceeds 30 seconds, the anti-blocking pipe mode is exited, the normal pumping mode is entered, and the controller adjusts the real-time displacement of the main pump to be the set displacement.
Further, the anti-blocking pipe modes comprise an M1 mode, an M2 mode, an M3 mode, an M4 mode and an M5 mode;
in the pipe blockage prevention mode, the method for adjusting the real-time rotating speed of the engine and the real-time displacement of the main pump by the controller according to the preset logic comprises the following steps:
when the pumping pressure changes to 300bar, the M1 mode is entered, and the controller generates the following corresponding displacement and speed change commands:
the displacement is changed: adjusting the real-time displacement of a main pump to be the displacement of a through pipe;
change of the rotating speed: adjusting the real-time rotating speed of the engine to be a first target rotating speed;
when the pumping pressure is continuously changed for 3 strokes and the pumping pressure is between 270bar and 350bar, an M2 mode is entered, and the controller generates the following corresponding displacement and rotating speed change commands:
the displacement is changed: and the controlled variable mechanism reduces the displacement by 10% on the basis of the current real-time displacement of the main pump in the next stroke until the real-time displacement of the main pump is less than or equal to the displacement of the through pipe, and if the real-time displacement of the original main pump is less than or equal to the displacement of the through pipe, the controlled variable mechanism is executed according to the real-time displacement of the original main pump.
Change of the rotating speed: if the real-time discharge capacity of the main pump is less than or equal to the discharge capacity of the through pipe and the pumping pressure is still greater than 250bar, adjusting the real-time rotating speed of the engine to a first target rotating speed;
when the pumping pressure varies by more than 50bar and the pumping pressure is between 270bar and 350bar, the M3 mode is entered, and the controller generates the following corresponding displacement and speed variation commands:
the displacement is changed: and the controlled variable mechanism reduces the displacement by 30% on the basis of the current real-time displacement of the main pump in the next stroke until the real-time displacement of the main pump is less than or equal to the displacement of the through pipe, and if the real-time displacement of the original main pump is less than or equal to the displacement of the through pipe, the controlled variable mechanism is executed according to the real-time displacement of the original main pump.
Change of the rotating speed: if the real-time discharge capacity of the main pump is less than or equal to the discharge capacity of the through pipe and the pumping pressure is still greater than 250bar, adjusting the real-time rotating speed of the engine to a first target rotating speed;
when the pumping pressure reaches 300bar during the pumping process, the M4 mode is entered, and the controller generates the following corresponding displacement and rotating speed change commands:
the displacement is changed: the step division adjustment is carried out according to the gear of the set displacement, and the steps are divided into a fourth step value d4% (30%), a third step value d3% (20%), a second step value d2% (10%) and a first step value d1% (5%);
the step adjustment means: the method comprises the steps of gradually decreasing according to the set displacement, and when the set displacement is a fourth gear (preferably 80% -100%), reducing the displacement of a fourth step value D4% (30%) for each stroke of the real-time displacement of a main pump until the real-time displacement of the main pump is less than or equal to D1% (preferably 25%); when the displacement is set to be in a third gear (preferably 60% -80%), reducing the displacement of a third step value D3% (20%) for each stroke of the real-time displacement of the main pump until the real-time displacement of the main pump is less than or equal to D1% (preferably 25%); when the displacement is set to be in a second gear (preferably 40% -60%), reducing the displacement of each stroke of the real-time displacement of the main pump by a second step value D2% (10%) until the real-time displacement of the main pump is less than or equal to D1% (preferably 25%); when the set displacement is that the first gear is less than 40%, reducing the displacement of each stroke of the real-time displacement of the main pump by a first step value D1% (5%) until the real-time displacement of the main pump is less than or equal to D1% (preferably 25%);
change of the rotating speed: if the real-time discharge capacity of the main pump is less than or equal to the discharge capacity of the through pipe and the pumping pressure is still greater than 250bar, adjusting the real-time rotating speed of the engine to a first target rotating speed;
when the pumping pressure reaches 350bar and lasts for 20 seconds, an M5 mode is entered, the controller outputs a system pressure high alarm signal, the engine is controlled to return to an idle speed, and the discharge capacity of the main pump is reduced to the minimum discharge capacity.
Further, the preset material waiting time is 15 minutes; the first target rotating speed is 1450 revolutions per minute, the preset through pipe reversing period is 5 reversing periods, and the through pipe displacement is 25%.
In a second aspect, the invention provides a control method for preventing pipe blockage of concrete pumping machinery, which comprises the following steps:
acquiring operation parameters of concrete pumping machinery;
and controlling the action of the engine and the variable mechanism according to the operating parameters so as to prevent or reduce pipe blockage.
Further, the operation parameters comprise the state of a pumping switch, the real-time rotating speed of a transmitter and the set displacement;
the method for controlling the action of the engine and the variable mechanism according to the running parameters comprises the following steps:
when the pumping stop time exceeds the preset material waiting time and the main pump is started again, controlling the engine to adjust the real-time rotating speed to a first target rotating speed and adjusting the real-time discharge capacity of the main pump to be the discharge capacity of the through pipe, wherein the process lasts for a preset through pipe reversing period;
after the reversing period of the through pipe is finished, adjusting the real-time displacement of the main pump to be a set displacement;
and in the material waiting process, if a pump worker manually operates the reverse pump, recalculating the pumping stop time, and restarting to calculate the pumping stop time when the reverse pump is finished.
Further, the method for controlling the action of the engine and the variable mechanism according to the running parameters comprises the following steps:
entering an anti-blocking pipe mode according to the pumping pressure; in the pipe blockage prevention mode, the rotating speed and the pumping displacement of the engine are adjusted according to preset logic;
and continuously monitoring the pumping pressure, and if the pumping pressure is not more than 250bar and the duration exceeds 30 seconds, exiting the anti-blocking pipe mode and entering a normal pumping mode.
Further, the anti-blocking pipe modes comprise an M1 mode, an M2 mode, an M3 mode, an M4 mode and an M5 mode;
in the anti-blocking pipe mode, the method for adjusting the engine speed and the pumping displacement according to the preset logic comprises the following steps:
when the pumping pressure changes to 300bar, the M1 mode is entered, and the controller generates the following corresponding displacement and speed change commands:
the displacement is changed: adjusting the real-time displacement of a main pump to be the displacement of a through pipe;
change of the rotating speed: adjusting the real-time rotating speed of the engine to be a first target rotating speed;
when the pumping pressure is continuously changed for 3 strokes and the pumping pressure is between 270bar and 350bar, an M2 mode is entered, and the controller generates the following corresponding displacement and rotating speed change commands:
the displacement is changed: and the controlled variable mechanism reduces the displacement by 10% on the basis of the current real-time displacement of the main pump in the next stroke until the real-time displacement of the main pump is less than or equal to the displacement of the through pipe, and if the real-time displacement of the original main pump is less than or equal to the displacement of the through pipe, the controlled variable mechanism is executed according to the real-time displacement of the original main pump.
Change of the rotating speed: if the real-time discharge capacity of the main pump is less than or equal to the discharge capacity of the through pipe and the pumping pressure is still greater than 250bar, adjusting the real-time rotating speed of the engine to a first target rotating speed;
when the pumping pressure varies by more than 50bar and the pumping pressure is between 270bar and 350bar, the M3 mode is entered, and the controller generates the following corresponding displacement and speed variation commands:
the displacement is changed: and the controlled variable mechanism reduces the displacement by 30% on the basis of the current real-time displacement of the main pump in the next stroke until the real-time displacement of the main pump is less than or equal to the displacement of the through pipe, and if the real-time displacement of the original main pump is less than or equal to the displacement of the through pipe, the controlled variable mechanism is executed according to the real-time displacement of the original main pump.
Change of the rotating speed: if the real-time discharge capacity of the main pump is less than or equal to the discharge capacity of the through pipe and the pumping pressure is still greater than 250bar, adjusting the real-time rotating speed of the engine to a first target rotating speed;
when the pumping pressure reaches 300bar during the pumping process, the M4 mode is entered, and the controller generates the following corresponding displacement and rotating speed change commands:
the displacement is changed: the step division adjustment is carried out according to the gear of the set displacement, and the steps are divided into a fourth step value d4% (30%), a third step value d3% (20%), a second step value d2% (10%) and a first step value d1% (5%);
the step adjustment means: the method comprises the steps of gradually decreasing according to the set displacement, and when the set displacement is a fourth gear (preferably 80% -100%), reducing the displacement of a fourth step value D4% (30%) for each stroke of the real-time displacement of a main pump until the real-time displacement of the main pump is less than or equal to D1% (preferably 25%); when the displacement is set to be in a third gear (preferably 60% -80%), reducing the displacement of a third step value D3% (20%) for each stroke of the real-time displacement of the main pump until the real-time displacement of the main pump is less than or equal to D1% (preferably 25%); when the displacement is set to be in a second gear (preferably 40% -60%), reducing the displacement of each stroke of the real-time displacement of the main pump by a second step value D2% (10%) until the real-time displacement of the main pump is less than or equal to D1% (preferably 25%); when the displacement is set to be a first gear (preferably less than 40%), reducing the displacement of the real-time displacement of the main pump by a first step value D1% (5%) per stroke until the real-time displacement of the main pump is less than or equal to a discharge capacity D1% (preferably 25%);
change of the rotating speed: if the real-time discharge capacity of the main pump is less than or equal to the discharge capacity of the through pipe and the pumping pressure is still greater than 250bar, adjusting the real-time rotating speed of the engine to a first target rotating speed;
when the pumping pressure reaches 350bar and lasts for 20 seconds, an M5 mode is entered, the controller outputs a system pressure high alarm signal, the engine is controlled to return to an idle speed, and the discharge capacity of the main pump is reduced to the minimum discharge capacity.
Further, the preset material waiting time is 15 minutes; the first target rotating speed is 1450 revolutions per minute, the preset through pipe reversing period is 5 reversing periods, and the through pipe displacement is 25%.
Compared with the prior art, the invention has the following beneficial effects:
1. the pipe blockage situation can be automatically judged by the machine, manual judgment is replaced, the operation difficulty is reduced, the pipe blockage prevention operation can be automatically carried out, the monitoring is more timely, the reaction is quicker, the execution is more broken, the pipe blockage prevention operation is more automatic and intelligent, and the reliability is stronger.
2. The invention monitors the parameters of the state of a pumping switch of the concrete pumping machine, the pump stopping time, the pumping pressure change, the engine rotating speed, the displacement and the like in real time, and executes a corresponding strategy according to preset logic so as to achieve the aim of preventing or reducing pipe blockage.
3. When the pump stopping time exceeds the set time, the pumping is started again to enter a pipe communicating mode, and the pipe blockage caused by the segregation or solidification of concrete in the conveying pipe is prevented;
4. according to the invention, all load change conditions are divided into multiple types (not limited to five types), and the type of the load change conditions can be automatically judged according to the load change and correspondingly adjusted; the threshold value is adjustable, can accord with multiple operating mode, has more the practicality.
5. The control method is suitable for all concrete pumping machines.
Drawings
FIG. 1 is a flow chart of a pass-through mode.
Fig. 2 is a flow chart of a pipe blocking prevention mode.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
In the description of the present embodiment, it should be noted that, as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the indicated orientation or positional relationship thereof is based on the orientation or positional relationship shown in the drawings, and is only for convenience of describing the present embodiment and simplifying the description, but does not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, cannot be construed as limiting the present embodiment.
The first embodiment is as follows:
the embodiment provides a concrete pumping machine, which is a machine for delivering concrete to a specified position by pressure, and comprises a main pump, a pressure sensor, a controller, an engine, a rotating speed sensor, a variable mechanism for controlling the real-time discharge capacity of the main pump, a remote controller and a pumping switch.
The controller is used for acquiring the operation parameters of the concrete pumping machine in real time and controlling the action of the engine and the variable mechanism according to the operation parameters so as to prevent or reduce pipe blockage. The operation parameters comprise the state of a pumping switch, the pumping pressure, the rotating speed of an engine, the real-time displacement of a main pump and the set displacement. The engine indirectly controls the rotating speed of the main pump according to the real-time rotating speed of the engine, and the size of the swash plate of the main pump is adjusted through the variable mechanism, so that the real-time discharge capacity of the main pump output by the main pump is adjusted.
The main pump is a swash plate type axial plunger variable displacement pump for converting engine power into hydraulic power.
The input end of the controller is connected with a pumping switch for starting and stopping pumping, and the pumping switch is used for conveying the state of the pumping switch to the controller so as to start pumping and stop pumping.
The pressure sensor is arranged at the delivery end of the main pump and used for collecting the pumping pressure of the main pump and delivering the pumping pressure to the controller through connection with the input end of the controller.
The execution end of the variable mechanism is connected with the main pump and is used for controlling the real-time discharge capacity of the main pump; the controller is connected with the variable mechanism to obtain the real-time displacement of the main pump.
The controller is connected with a remote controller, and the remote controller is provided with a displacement adjusting knob for an operator to input a set displacement; ten gears are marked on the displacement knob of the remote controller, and represent the input set displacement as 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 100% of the total displacement. In the normal pumping mode, the real-time displacement of the main pump under the control of the variable displacement mechanism is equal to the input set displacement. The remote controller discharge capacity knob is also connected with the controller, and the set discharge capacity and the real-time discharge capacity of the main pump are transmitted to the controller.
The engine is connected with the main pump and used for supplying power for the operation of the main pump.
The rotating speed sensor is arranged on the engine and is connected with the input end of the controller to convey the collected real-time rotating speed of the engine to the controller; the method for adjusting the real-time rotating speed of the engine by the controller comprises the following steps: and comparing the real-time rotating speed with the target rotating speed, if the real-time rotating speed is not consistent with the target rotating speed, adjusting the real-time rotating speed until the real-time rotating speed is equal to the target rotating speed, wherein the error between the target rotating speed and the real-time rotating speed is not more than 30 revolutions per minute, and if the error is more than 30 revolutions per minute, adjusting. The method is beneficial to balancing the control precision and the cost, and the cost is reduced as much as possible on the premise of ensuring the control precision.
And the output end of the controller is connected with the variable mechanism and the engine. The controller is internally provided with a timer, obtains the pumping stop time of the main pump by analyzing the state of the pumping switch, and obtains the pumping pressure change by analyzing the pumping pressure. The controller enters different working modes according to pumping stop time, pumping pressure change, set displacement and real-time displacement of the main pump.
The concrete pumping machine has three working modes: normal pumping mode, pipe-through mode and anti-blocking mode. The anti-blocking pipe mode is divided into five load pressure change types and has corresponding control methods of displacement and rotating speed. The controller enters different operation modes according to the pumping stop time and the pumping pressure of the main pump, and controls the variable mechanism and the engine to operate according to a preset program, so that different rotating speeds and different discharge capacities are realized, and the occurrence of pipe blockage is prevented.
A pipe passing mode: the effect of the pipe-through mode is to prevent the time for waiting the mixer from being too long and the concrete in the conveying pipe from being left for a long time to cause pipe blockage when the concrete is pumped again. When the pump stop time exceeds T minutes (preferably 15 minutes) and pumping is started again, the controller automatically enters the intake mode, adjusts the engine to R1 revolutions (preferably 1450 revolutions) and regulates the main pump displacement to intake D1% (preferably 25%) in real time, which lasts n (preferably 5) commutation cycles.
And when the pipe-communicating mode is executed, automatically exiting the pipe-communicating mode and entering a normal pumping state to work. In the material waiting process, if a pump worker manually operates the reverse pump, the material waiting time is recalculated, and the timing is started again when the reverse pump is finished. All the numbers indicated by the letters above can be adjusted, and the preferable numbers are better.
The flow of the pipe-through mode is shown in fig. 1.
Anti-blocking pipe mode: the treatment process is divided into five types according to the pumping pressure and the set displacement, namely M1, M2, M3, M4 and M5. The pumping pressure is in bar, and 1bar (bar) =100 kilopascals (kPa) =10 newtons per square centimeter (10N/cm2) =0.1 MPa.
M1: the pumping pressure change (in one stroke) reaches P3bar (preferably 300 bar) after the pumping is started. The corresponding displacement and speed changes performed by the controller are as follows:
the displacement is changed: the control variable mechanism adjusts the real-time displacement of the main pump to the discharge D1% (preferably 25%) of the through pipe.
Change of the rotating speed: the engine speed is adjusted to R1 revolutions (preferably 1450 revolutions per minute). And when the rotating speed is adjusted, comparing the real-time rotating speed with the target rotating speed, if the real-time rotating speed is not consistent with the target rotating speed, adjusting the real-time rotating speed until the real-time rotating speed is equal to the target rotating speed, wherein the error between the target rotating speed and the real-time rotating speed is not more than 30 revolutions per minute, and if the error is more than 30 revolutions per minute, adjusting.
M2: the pumping pressure varies continuously by n2 (preferably 3) strokes and exceeds P2bar (preferably 270 bar) to P4bar (preferably 350 bar). The corresponding displacement and speed changes performed by the controller are as follows:
the displacement is changed: and the controlled variable mechanism reduces the displacement of D2% (preferably 10%) on the basis of the current real-time displacement of the main pump in the next stroke until the real-time displacement of the main pump < = D1% (preferably 25%), and if the real-time displacement of the original main pump < = D1% (preferably 25%), the control is executed according to the real-time displacement of the original main pump.
Change of the rotating speed: if the real-time displacement of the main pump < = the discharge of a through pipe D1% (preferably 25%) and the pumping pressure is still larger than P1bar (preferably 250 bar), the engine speed is adjusted to R1 revolutions (preferably 1450 revolutions).
M3: the pumping pressure varies by more than P3bar (preferably 50bar) and is between P2bar and P4bar (preferably 270bar and 350 bar). The controller performs the corresponding displacement and speed changes as follows:
the displacement is changed: the controlled variable mechanism reduces the displacement of D4% (preferably 30%) on the next stroke based on the current real-time displacement of the main pump until the real-time displacement of the main pump reaches D1% (preferably 25%).
Change of the rotating speed: if the real-time displacement of the main pump < = the discharge of a through pipe D1% (preferably 25%) and the pumping pressure is still larger than P1bar (preferably 250 bar), the engine speed is adjusted to R1 revolutions (preferably 1450 revolutions).
M4: the pumping pressure during the pumping process reaches P4bar (preferably 300 bar). The controller executes the corresponding displacement and speed changes as follows:
the displacement is changed: and step adjustment is carried out according to the gears with set displacement, and the steps are divided into a fourth step value d4% (30%), a third step value d3% (20%), a second step value d2% (10%) and a first step value d1% (5%). The step adjustment means: the method comprises the steps of gradually decreasing according to the set displacement, and when the set displacement is a fourth gear (preferably 80% -100%), reducing the displacement of a fourth step value D4% (30%) for each stroke of the real-time displacement of a main pump until the real-time displacement of the main pump is less than or equal to D1% (preferably 25%); when the displacement is set to be in a third gear (preferably 60% -80%), reducing the displacement of a third step value D3% (20%) for each stroke of the real-time displacement of the main pump until the real-time displacement of the main pump is less than or equal to D1% (preferably 25%); when the displacement is set to be in a second gear (preferably 40% -60%), reducing the displacement of each stroke of the real-time displacement of the main pump by a second step value D2% (10%) until the real-time displacement of the main pump is less than or equal to D1% (preferably 25%); when the set displacement is that the first gear is less than 40%, reducing the displacement of each stroke of the real-time displacement of the main pump by a first step value D1% (5%) until the real-time displacement of the main pump is less than or equal to D1% (preferably 25%);
change of the rotating speed: if the real-time displacement of the main pump < = the discharge of a through pipe D1% (preferably 25%) and the pumping pressure is still larger than P1bar (preferably 250 bar), the engine speed is adjusted to R1 revolutions (preferably 1450 revolutions).
M5: when the pumping pressure reaches P5bar (preferably 350bar) for T3 (preferably 20 seconds), the controller executes corresponding processing measures to output a system pressure high alarm signal, control the engine to return to the idle speed and reduce the displacement of the main pump to the minimum displacement.
The flow of the anti-clogging mode is shown in fig. 2. Each data of this embodiment is through practice inspection's preferred, is favorable to preventing stifled emergence of managing, is favorable to improving the accuracy of judging and the timeliness of measure, eliminates stifled danger of managing at the sprouting state, and the reaction is more rapid, carries out more fruit absolutely for prevent that stifled pipe operation has more automation, intellectuality, and the reliability is stronger.
After entering the pipe blockage prevention mode, adjusting the rotating speed and the pumping displacement of the engine according to preset logic, continuously monitoring, and if the pumping pressure is less than P1bar (preferably 250 bar) and the duration exceeds t seconds (preferably 30 seconds), the controller exits the pipe blockage prevention mode, namely the controller controls the variable mechanism to enable the real-time displacement of the main pump to recover 5% of the displacement per stroke until the set displacement is recovered, and then entering the normal pumping mode. If the pressure exceeds P2bar (preferably 270 bar) in the recovery process, controlling the real-time discharge capacity of the main pump to stop rising, and if the discharge capacity is manually increased by a pumping worker in the anti-blocking pipe execution process, increasing the discharge capacity on the basis of the real-time discharge capacity of the main pump according to the difference value between the set discharge capacity and the real-time discharge capacity of the main pump; if the displacement is manually reduced, the displacement is reduced on the basis of the real-time displacement of the main pump.
According to the technical scheme, the pipe blockage condition can be automatically judged, manual judgment is replaced, and the operation difficulty is reduced. The anti-blocking pipe operation can be automatically carried out, the monitoring is more timely, the reaction is quicker, and the execution is more broken, so that the anti-blocking pipe operation is more automatic and intelligent, and the reliability is stronger.
The implementation principle is as follows: 1. the method comprises the steps of monitoring parameters such as the state of a pumping switch of the concrete pumping machine, the pump stopping time, the pumping pressure change, the engine rotating speed and the displacement in real time, and executing a corresponding strategy according to preset logic so as to achieve the purpose of preventing or reducing pipe blockage.
2. When the pump stopping time exceeds the set time, the pumping is started again to enter a pipe communicating mode, and the pipe blockage caused by the segregation or solidification of concrete in the conveying pipe is prevented;
3. all load change conditions are divided into multiple types (not limited to five types), and the controller can automatically judge which type the load change belongs to and carry out corresponding adjustment according to the load change;
4. the threshold value is adjustable, can accord with multiple operating mode, has more the practicality.
5. The control method is suitable for all concrete pumping machines.
Example two:
the embodiment provides a control method for preventing a pumping machine from blocking a pipe, which selects different modes for processing according to operation parameters so as to prevent the pipe from being blocked. The operation parameters mainly comprise the state of a pumping switch, the pumping pressure, the real-time rotating speed of an engine, the real-time displacement of a main pump and the set displacement.
And acquiring the pumping stop time according to the state of the pumping switch. The state of the pumping switch is obtained through the pumping switch, the pumping pressure is obtained through the pressure sensor, and the rotating speed sensor is used
The whole control method for preventing the pipe blockage comprises two modes: a through pipe mode and an anti-blocking pipe mode. The anti-blocking pipe mode is divided into five load pressure change types and has corresponding control methods of displacement and rotating speed.
A pipe passing mode: the effect of the pipe-through mode is to prevent the concrete in the conveying pipe from causing pipe blockage when the time for waiting the mixing truck is too long and the concrete is not moved for pumping again for a long time. When pumping is stopped for more than T minutes (preferably 15 minutes) to start pumping again, the bypass mode is automatically entered, the engine is adjusted to R1 revolutions (preferably 1450 revolutions) and the main pump displacement is regulated in real time to bypass displacement D1% (preferably 25%), which lasts n (preferably 5) commutation cycles.
And when the pipe-communicating mode is executed, automatically exiting the pipe-communicating mode and entering a normal pumping state to work. In the material waiting process, if a pump worker manually operates the reverse pump, the material waiting time is recalculated, and the timing is started again when the reverse pump is finished.
The flow of the pipe-through mode is shown in fig. 1.
Anti-blocking pipe mode: the treatment process is divided into five types according to the pumping pressure and the set displacement, namely M1, M2, M3, M4 and M5. The pumping pressure is in bar, and 1bar (bar) =100 kilopascals (kPa) =10 newtons per square centimeter (10N/cm2) =0.1 MPa.
M1: the pumping pressure variation (within one stroke) reaches P3bar (preferably 300 bar) after starting pumping, and the corresponding displacement and rotation speed variations executed are as follows:
the displacement is changed: the control variable mechanism adjusts the real-time displacement of the main pump to the discharge D1% (preferably 25%) of the through pipe.
Change of the rotating speed: the engine speed is adjusted to R1 revolutions (preferably 1450 revolutions per minute). And when the rotating speed is adjusted, comparing the real-time rotating speed with the target rotating speed, if the real-time rotating speed is not consistent with the target rotating speed, adjusting the real-time rotating speed until the real-time rotating speed is equal to the target rotating speed, wherein the error between the target rotating speed and the real-time rotating speed is not more than 30 revolutions per minute, and if the error is more than 30 revolutions per minute, adjusting.
M2: the pumping pressure varies continuously by n2 (preferably 3) strokes and exceeds P2bar (preferably 270 bar) to P4bar (preferably 350bar), corresponding variations in displacement and rotation speed are carried out as follows:
the displacement is changed: and the controlled variable mechanism reduces the displacement of D2% (preferably 10%) on the basis of the current real-time displacement of the main pump in the next stroke until the real-time displacement of the main pump < = D1% (preferably 25%), and if the real-time displacement of the original main pump < = D1% (preferably 25%), the control is executed according to the real-time displacement of the original main pump.
Change of the rotating speed: if the real-time displacement of the main pump < = the discharge of a through pipe D1% (preferably 25%) and the pumping pressure is still larger than P1bar (preferably 250 bar), the engine speed is adjusted to R1 revolutions (preferably 1450 revolutions).
M3: the pumping pressure varies by more than P3bar (preferably 50bar) and between P2bar and P4bar (preferably 270bar and 350bar), corresponding displacement and rotation speed variations are carried out as follows:
the displacement is changed: the controlled variable mechanism reduces the displacement of D4% (preferably 30%) on the next stroke based on the current real-time displacement of the main pump until the real-time displacement of the main pump reaches D1% (preferably 25%).
Change of the rotating speed: if the real-time displacement of the main pump < = the discharge of a through pipe D1% (preferably 25%) and the pumping pressure is still larger than P1bar (preferably 250 bar), the engine speed is adjusted to R1 revolutions (preferably 1450 revolutions).
M4: the pumping pressure during pumping reaches P4bar (preferably 300 bar), and the corresponding displacement and speed changes are carried out as follows:
the displacement is changed: and step adjustment is carried out according to the gears with set displacement, and the steps are divided into a fourth step value d4% (30%), a third step value d3% (20%), a second step value d2% (10%) and a first step value d1% (5%). The step adjustment means: the method comprises the steps of gradually decreasing according to the set displacement, and when the set displacement is a fourth gear (preferably 80% -100%), reducing the displacement of a fourth step value D4% (30%) for each stroke of the real-time displacement of a main pump until the real-time displacement of the main pump is less than or equal to D1% (preferably 25%); when the displacement is set to be in a third gear (preferably 60% -80%), reducing the displacement of a third step value D3% (20%) for each stroke of the real-time displacement of the main pump until the real-time displacement of the main pump is less than or equal to D1% (preferably 25%); when the displacement is set to be in a second gear (preferably 40% -60%), reducing the displacement of each stroke of the real-time displacement of the main pump by a second step value D2% (10%) until the real-time displacement of the main pump is less than or equal to D1% (preferably 25%); when the displacement is set to be a first gear (preferably less than 40%), reducing the displacement of the real-time displacement of the main pump by a first step value D1% (5%) per stroke until the real-time displacement of the main pump is less than or equal to a discharge capacity D1% (preferably 25%);
change of the rotating speed: if the real-time displacement of the main pump < = the discharge of a through pipe D1% (preferably 25%) and the pumping pressure is still larger than P1bar (preferably 250 bar), the engine speed is adjusted to R1 revolutions (preferably 1450 revolutions).
M5: the pumping pressure reaches P5bar (preferably 350bar) for T3 (preferably 20 seconds), corresponding processing measures are carried out: and outputting a high-pressure alarm signal of the system to stop the main pump.
The flow of the anti-clogging mode is shown in fig. 2.
After entering the pipe blockage prevention mode, adjusting the rotation speed and the pumping displacement of the engine according to preset logic, continuously monitoring, and if the pumping pressure < = P1bar (preferably 250 bar) and the duration time exceeds t seconds (preferably 30 seconds), exiting the pipe blockage prevention mode to perform normal pumping.
According to the technical scheme, the pipe blockage condition can be automatically judged, manual judgment is replaced, and the operation difficulty is reduced. The anti-blocking pipe operation can be automatically carried out, the monitoring is more timely, the reaction is quicker, and the execution is more broken, so that the anti-blocking pipe operation is more automatic and intelligent, and the reliability is stronger.
The reasons for tube blockage are generally divided into four categories:
firstly, concrete in the pump truck delivery pipe is not pumped for a long time, and this probably is that the joining time between trucd mixer and the trucd mixer is too long, and after last trucd mixer unloaded the material, next trucd mixer has just passed very long time, just so leads to concrete not to move for a long time in the pump pipe, causes concrete segregation very easily, and the stifled pipe is because this reason mostly.
Secondly, the workability of the concrete is poor, the workability of the concrete comprises parameters such as the fluidity and the water retention property of the concrete, which are related to the working property of the concrete, the workability is poor, the fluidity of the concrete is very poor, the concrete is too dry or too wet, the concrete cylinder material of the pump truck is easy to be sucked to be empty, and the resistance of the concrete in a pump pipe is larger due to the poor workability, so that the pipe blockage is easy to be caused. However, the workability of the concrete is mainly determined by the proportion, and weather causes can cause the moisture content of the aggregate to change, thereby influencing the workability of the concrete.
And thirdly, the piston of the pump truck is seriously abraded, the piston of the concrete cylinder is seriously abraded, the material suction performance of concrete is poor, the pumping pressure is insufficient, and the water in the concrete can run into a water tank in the middle, so that the flowability of the concrete is poor.
Fourthly, the operation is improper, firstly, the angle of the arm support is not controlled properly, when the arm support is dry, the arm support of the concrete pump truck is enabled to be completely unfolded and in an arc shape, the arm support is not required to be kept in a folded state when the pump truck is dry, so that an angle is easily formed in a bent pipe at the joint of the arm support and the arm support, the resistance of concrete in a pump pipe is increased, and in addition, a pipeline of the pump truck vertically downwards or a pipeline of the pump truck vertically upwards needs to be provided with a defense segregation device to prevent the pipe blockage; secondly, the pumping speed is not adjusted properly, and when the pump is pumped, the speed is selected very key, so that an operator cannot quickly look at the map, and sometimes the speed is not reached. When the pump is used for the first time, the pipeline resistance is large, the pump is required to be used for pumping at a low speed, and the pumping speed can be properly increased after the pump is normally used; and finally, the amount of the excess material is improperly controlled, when the pump is used for pumping, an operator needs to observe the excess material in the hopper at any time, the excess material is not lower than the stirring shaft, and if the excess material is too little, air is easily sucked, so that the pipe is blocked.
Based on this, the key point of the inventive concept is that:
1. the method comprises the steps of monitoring parameters such as the state of a pumping switch of the concrete pumping machine, the pump stopping time, the pumping pressure change, the engine rotating speed and the displacement in real time, and executing a corresponding strategy according to preset logic so as to achieve the purpose of preventing or reducing pipe blockage.
2. When the pump stopping time exceeds the set time, the pumping is started again to enter a pipe communicating mode, and the pipe blockage caused by the segregation or solidification of concrete in the conveying pipe is prevented;
3. all load change conditions are divided into multiple types (not limited to five types), and the controller can automatically judge which type the load change belongs to and carry out corresponding adjustment according to the load change;
4. the threshold value is adjustable, can accord with multiple operating mode, has more the practicality.
5. The control method is suitable for all concrete pumping machines.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature, and in the description of the invention, "plurality" means two or more unless explicitly specifically defined otherwise.
In the present invention, unless otherwise specifically stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.
In the description herein, reference to the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (10)
1. A concrete pumping machine is characterized by comprising a main pump, a controller, an engine and a variable mechanism;
the main pump is used for converting the power of the engine into hydraulic power so as to convey concrete;
the execution end of the variable mechanism is connected with a main pump and is used for controlling and adjusting the real-time discharge capacity of the main pump;
the engine is connected with the main pump and is used for supplying power for the operation of the main pump;
the controller is respectively connected with the variable mechanism and the engine and used for acquiring the operation parameters of the concrete pumping machine in real time, controlling the action of the engine and the variable mechanism according to the operation parameters and adjusting the real-time rotating speed of the engine and the real-time discharge capacity of the main pump.
2. The concrete pumping machine of claim 1, wherein the operating parameters include a state of a pumping switch and a set displacement;
the input end of the controller is connected with a pumping switch for controlling the pumping start and stop; a timing device is arranged in the controller and used for calculating and acquiring pumping stop time according to the state of the pumping switch;
the controller is connected with the engine to control and adjust the real-time rotating speed of the engine; the controller is connected with the variable mechanism to control and adjust the real-time discharge capacity of the main pump;
when the pumping stop time exceeds the preset material waiting time and the pumping is started again, the controller enters a pipe passing mode, and the pipe passing mode is as follows: the controller controls the engine to adjust the real-time rotating speed to a first target rotating speed and controls the variable mechanism to adjust the real-time discharge capacity of the main pump to be the discharge capacity of the through pipe, and the process lasts for a preset through pipe reversing period;
after the pipe communicating mode is executed, the controller automatically exits the pipe communicating mode and enters a normal pumping mode, and the controller adjusts the real-time displacement of the main pump to be a set displacement; during the material waiting process, if a pump worker manually operates the reverse pump, recalculating the pumping stop time, and restarting to calculate the pumping stop time when the reverse pump is finished;
the set displacement input comprises: the controller is connected with a remote controller, and a discharge capacity adjusting knob is arranged on the remote controller and used for inputting set discharge capacity.
3. Concrete pumping machine according to claim 2, characterized in that the operating parameters also comprise the pumping pressure;
the delivery end of the main pump is provided with a pressure sensor, and the pressure sensor is connected with the input end of the controller to deliver the pumping pressure of the main pump to the controller;
the controller adjusts the real-time rotating speed of the engine and the real-time displacement of the main pump according to preset logic according to the pumping pressure and the set displacement;
and the controller continuously monitors the pumping pressure, and if the pumping pressure is less than or equal to 250bar and the duration exceeds 30 seconds, the controller enters a normal pumping mode and adjusts the real-time displacement of the main pump to the set displacement.
4. The concrete pumping machine of claim 3, wherein said adjusting the real-time rotational speed of the engine and the real-time displacement of the main pump according to a predetermined logic comprises:
when the change of the pumping pressure reaches 300bar, the controller adjusts the real-time discharge capacity of the main pump to be the discharge capacity of the through pipe, and adjusts the real-time rotating speed of the engine to be a first target rotating speed;
when the pumping pressure is continuously changed by 3 strokes and the pumping pressure is between 270bar and 350bar, the controller controls the variable mechanism to reduce the displacement by 10 percent on the basis of the current real-time displacement of the main pump in the next stroke until the real-time displacement of the main pump is less than or equal to the displacement of a through pipe, and if the real-time displacement of the original main pump is less than or equal to the displacement of the through pipe, the real-time displacement of the original main pump is executed; if the real-time discharge capacity of the main pump is smaller than or equal to that of the through pipe and the pumping pressure is still larger than 250bar, the controller adjusts the real-time rotating speed of the engine to a first target rotating speed;
when the pumping pressure changes to exceed 50bar and the pumping pressure is between 270bar and 350bar, the controller controls the variable mechanism to reduce the displacement by 30 percent on the basis of the current real-time displacement of the main pump in the next stroke until the real-time displacement of the main pump is less than or equal to the displacement of a through pipe, and if the real-time displacement of the original main pump is less than or equal to the displacement of the through pipe, the control is executed according to the real-time displacement of the original main pump; if the real-time discharge capacity of the main pump is smaller than or equal to that of the through pipe and the pumping pressure is still larger than 250bar, the controller adjusts the real-time rotating speed of the engine to a first target rotating speed;
when the pumping pressure reaches 300bar in the pumping process, the controller performs stepped adjustment according to the gear of the set displacement, and performs stepped decrease according to the set displacement, and when the set displacement is a fourth gear, the displacement of a fourth step value is reduced for each stroke of the real-time displacement of the main pump until the real-time displacement of the main pump is less than or equal to the displacement of a through pipe; when the set displacement is a third gear, reducing the displacement of a third step value for each stroke of the real-time displacement of the main pump until the real-time displacement of the main pump is less than or equal to the displacement of the through pipe; when the set displacement is a second gear, reducing the displacement of a second step value for each stroke of the real-time displacement of the main pump until the real-time displacement of the main pump is less than or equal to the displacement of the through pipe; when the set displacement is a first gear, reducing the displacement of a first step value for each stroke of the real-time displacement of the main pump until the real-time displacement of the main pump is less than or equal to the displacement of the through pipe; if the real-time discharge capacity of the main pump is smaller than or equal to that of the through pipe and the pumping pressure is still larger than 250bar, the controller adjusts the real-time rotating speed of the engine to a first target rotating speed;
when the pumping pressure reaches 350bar and lasts for 20 seconds, the controller outputs a high-pressure alarm signal of the system and controls the engine to return to idle speed, and the real-time discharge capacity of the main pump is reduced to the minimum discharge capacity.
5. Concrete pumping machine according to claim 4, characterized in that the preset waiting time is 15 minutes; the first target rotating speed is 1450 revolutions per minute, the preset through pipe reversing period is 5 strokes, and the through pipe displacement is 25%;
the fourth step value is 30%, the third step value is 20%, the second step value is 10%, and the first step value is 5%;
the fourth gear is 80% -100%, the third gear is 60% -80%, the second gear is 40% -60%, and the first gear is less than 40%.
6. A control method for preventing pipe blockage of concrete pumping machinery is characterized by comprising the following steps:
acquiring operation parameters of concrete pumping machinery;
and controlling the engine and the variable mechanism to act according to the operating parameters, and adjusting the real-time rotating speed of the engine and the real-time discharge capacity of the main pump.
7. The control method for preventing pipe blockage of concrete pumping machinery according to claim 6, wherein the operation parameters comprise the state of a pumping switch, the real-time rotating speed of a transmitter and the set displacement;
the method for controlling the action of the engine and the variable mechanism according to the running parameters comprises the following steps:
when the pumping stop time exceeds the preset material waiting time and the pumping switch is turned on again, adjusting the real-time rotating speed of the engine to a first target rotating speed and adjusting the real-time discharge capacity of the main pump to be the discharge capacity of the through pipe, wherein the process lasts for a preset through pipe reversing period;
after the reversing period of the through pipe is finished, adjusting the real-time displacement of the main pump to be a set displacement;
and in the material waiting process, if a pump worker manually operates the reverse pump, recalculating the pumping stop time, and restarting to calculate the pumping stop time when the reverse pump is finished.
8. The control method for preventing pipe blockage of concrete pumping machinery according to claim 7, wherein the operation parameters further comprise pumping pressure;
the method for controlling the action of the engine and the variable mechanism according to the running parameters comprises the following steps:
adjusting the rotating speed and the pumping displacement of the engine according to a preset logic according to the pumping pressure and the set displacement;
and continuously monitoring the pumping pressure, and adjusting the real-time displacement of the main pump to be the set displacement if the pumping pressure is not more than 250bar and the duration exceeds 30 seconds.
9. The method for controlling the concrete pumping machine to prevent pipe blockage according to claim 8, wherein the adjusting the real-time rotating speed of the engine and the real-time displacement of the main pump according to a preset logic comprises:
when the change of the pumping pressure reaches 300bar, adjusting the real-time discharge capacity of a main pump to be the discharge capacity of a through pipe, and adjusting the real-time rotating speed of an engine to be a first target rotating speed;
when the pumping pressure is continuously changed by 3 strokes and the pumping pressure is between 270bar and 350bar, the controller controls the variable mechanism to reduce the displacement by 10 percent on the basis of the current real-time displacement of the main pump in the next stroke until the real-time displacement of the main pump is less than or equal to the displacement of a through pipe, and if the real-time displacement of the original main pump is less than or equal to the displacement of the through pipe, the real-time displacement of the original main pump is executed; if the real-time discharge capacity of the main pump is smaller than or equal to that of the through pipe and the pumping pressure is still larger than 250bar, the controller adjusts the real-time rotating speed of the engine to a first target rotating speed;
when the pumping pressure changes to exceed 50bar and the pumping pressure is between 270bar and 350bar, the controller controls the variable mechanism to reduce the displacement by 30 percent on the basis of the current real-time displacement of the main pump in the next stroke until the real-time displacement of the main pump is less than or equal to the displacement of a through pipe, and if the real-time displacement of the original main pump is less than or equal to the displacement of the through pipe, the control is executed according to the real-time displacement of the original main pump; if the real-time discharge capacity of the main pump is smaller than or equal to that of the through pipe and the pumping pressure is still larger than 250bar, the controller adjusts the real-time rotating speed of the engine to a first target rotating speed;
when the pumping pressure reaches 300bar in the pumping process, the controller performs stepped adjustment according to the gear of the set displacement, and performs stepped decrease according to the set displacement, and when the set displacement is a fourth gear, the displacement of a fourth step value is reduced for each stroke of the real-time displacement of the main pump until the real-time displacement of the main pump is less than or equal to the displacement of a through pipe; when the set displacement is a third gear, reducing the displacement of a third step value for each stroke of the real-time displacement of the main pump until the real-time displacement of the main pump is less than or equal to the displacement of the through pipe; when the set displacement is a second gear, reducing the displacement of a second step value for each stroke of the real-time displacement of the main pump until the real-time displacement of the main pump is less than or equal to the displacement of the through pipe; when the set displacement is a first gear, reducing the displacement of a first step value for each stroke of the real-time displacement of the main pump until the real-time displacement of the main pump is less than or equal to the displacement of the through pipe; if the real-time discharge capacity of the main pump is smaller than or equal to that of the through pipe and the pumping pressure is still larger than 250bar, the controller adjusts the real-time rotating speed of the engine to a first target rotating speed;
when the pumping pressure reaches 350bar and lasts for 20 seconds, the controller outputs a high system pressure alarm signal and controls the engine to return to idle speed, and the discharge capacity of the main pump is reduced to the minimum discharge capacity.
10. The method for controlling a concrete pumping machine according to claim 9, wherein said preset waiting time is 15 minutes; the first target rotating speed is 1450 revolutions per minute, the preset through pipe reversing period is 5 reversing periods, and the through pipe displacement is 25%;
the fourth step value is 30%, the third step value is 20%, the second step value is 10%, and the first step value is 5%;
the fourth gear is 80% -100%, the third gear is 60% -80%, the second gear is 40% -60%, and the first gear is less than 40%.
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| CN202111410219.5A Active CN114233599B (en) | 2021-11-25 | 2021-11-25 | Concrete pumping machine and control method of pre-blocking prevention pipe of concrete pumping machine |
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| CN114233599B (en) | 2023-12-12 |
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