CN114233599B - Concrete pumping machine and control method of pre-blocking prevention pipe of concrete pumping machine - Google Patents
Concrete pumping machine and control method of pre-blocking prevention pipe of concrete pumping machine Download PDFInfo
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- CN114233599B CN114233599B CN202111410219.5A CN202111410219A CN114233599B CN 114233599 B CN114233599 B CN 114233599B CN 202111410219 A CN202111410219 A CN 202111410219A CN 114233599 B CN114233599 B CN 114233599B
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- 238000005086 pumping Methods 0.000 title claims abstract description 219
- 238000000034 method Methods 0.000 title claims abstract description 41
- 230000000903 blocking effect Effects 0.000 title claims abstract description 22
- 230000002265 prevention Effects 0.000 title claims abstract description 12
- 238000006073 displacement reaction Methods 0.000 claims abstract description 393
- 230000007246 mechanism Effects 0.000 claims abstract description 50
- 230000001276 controlling effect Effects 0.000 claims abstract description 19
- 230000001105 regulatory effect Effects 0.000 claims abstract description 18
- 230000009471 action Effects 0.000 claims abstract description 9
- 230000008859 change Effects 0.000 claims description 29
- 230000008569 process Effects 0.000 claims description 18
- 238000012544 monitoring process Methods 0.000 claims description 5
- 230000007423 decrease Effects 0.000 claims 2
- 239000000463 material Substances 0.000 description 8
- 238000005204 segregation Methods 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- 230000003247 decreasing effect Effects 0.000 description 4
- 238000011282 treatment Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 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
- 230000001419 dependent effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 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
- 238000012545 processing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 208000024891 symptom Diseases 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
Classifications
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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
-
- 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
-
- 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
-
- 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)
- Mechanical Engineering (AREA)
- 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 pre-blocking prevention pipes of the concrete pumping machine, which can effectively prevent the blocking of the pipes. 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 the main pump and used for controlling and regulating the real-time displacement 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 is used for acquiring the operation parameters of the concrete pumping machinery in real time and controlling the actions 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 of a pre-blocking prevention pipe of the concrete pumping machine.
Background
Concrete pumping machinery is engineering machinery which utilizes pressure to convey pre-stirred concrete to a certain height and distance along an arrangement pipeline, and is widely applied to modern building engineering. The controller is a key device for normal operation of the concrete pumping machine, and is equivalent to a control center of the concrete pumping machine, and the controller controls the displacement and the engine rotation speed in the whole pumping operation process. Under normal conditions, the highest value of the pumping oil pressure does not reach the set pressure, if the pressure peak value of each pumping stroke rises rapidly along with the alternation of the strokes, the set pressure is reached soon, the normal pumping circulation is stopped automatically, and the overflow valve of the main oil way sounds overflow, so that the occurrence of pipe blockage is indicated.
Generally, there are five measures for preventing the blocking of the pipe:
firstly, a pumper should concentrate on the pumping construction and pay attention to the reading of a pumping pressure gauge at any time, and once the reading of the pressure gauge is found to suddenly increase, the pump should be immediately reversed for 2-3 strokes and then be positively pumped, so that the pipe blockage can be eliminated;
secondly, pumping at a low speed when the symptoms of pipe blockage occur or the slump of concrete of a certain vehicle is smaller, and eliminating the pipe blockage in a sprouting state;
thirdly, the materials in the hopper cannot be piled too much and should be lower than the guard rail so as to clean coarse aggregate and oversized aggregate in time;
fourthly, when the slump of the concrete of a certain vehicle is smaller, the remainder can be lower than the stirring shaft and controlled above the S-shaped pipe or the suction inlet so as to reduce stirring resistance, swinging resistance and suction resistance;
fifthly, when the slump of the bucket of concrete is found to be small and pumping is impossible, the concrete should be timely discharged from the bottom of the bucket.
The prior art belongs to artificial judgment and operation, is highly dependent on the experience of operators, and has great instability. The person needs to pay attention to the pumping pressure at any time, and listen to the pumping sound, so that once attention is not focused and the pressure is missed, serious pipe blockage and even pipe blockage of a conveying pipe are easily caused. The experience is not enough, and improper operation can not prevent the pipe from being blocked, but can cause more serious pipe blocking or higher pipe blocking probability.
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 pre-blocking prevention pipes of the concrete pumping machine, which can effectively prevent pipe blocking.
In order to achieve the above 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 the main pump and used for controlling and regulating the real-time displacement 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 is used for acquiring the operation parameters of the concrete pumping machinery in real time, controlling the actions 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 displacement 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 start and stop of pumping; 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 regulate the real-time rotating speed of the engine; the controller is connected with the variable mechanism to control and regulate the real-time displacement of the main pump;
when the pumping stop time exceeds the preset waiting time and pumping is started again, the controller enters a through pipe mode, and the through pipe 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 displacement of the main pump to be the displacement of the through pipe, and the process lasts for a preset through pipe reversing period; after the execution of the through pipe mode is finished, the controller automatically exits the through pipe mode and enters a normal pumping mode, and the controller adjusts the real-time displacement of the main pump to set displacement; in the waiting process, if a pump worker manually operates the reverse pump, the pumping stop time is recalculated, and when the reverse pump is ended, the pumping stop time is calculated again.
The input of the set displacement comprises that the controller is connected with a remote controller, and the remote controller is provided with a displacement adjusting knob which is used for inputting the set displacement;
further, the operating parameters further include pumping pressure;
the conveying end of the main pump is provided with a pressure sensor, and the pumping pressure of the main pump is conveyed to the controller through being connected with the input end of the controller;
The controller enters an anti-blocking pipe mode according to the pumping pressure and the set displacement; in the anti-blocking pipe mode, the controller adjusts the real-time rotating speed of the engine and the real-time displacement of the main pump according to preset logic;
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 exits the anti-blocking pipe mode and enters a normal pumping mode, and the controller adjusts the real-time displacement of the main pump to the set displacement.
Further, the anti-blocking mode comprises 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 real-time rotating speed of the engine and the real-time displacement of the main pump by the controller according to preset logic comprises the following steps:
when the pumping pressure change reaches 300bar, the M1 mode is entered, and the controller generates the following corresponding displacement and rotating speed change instructions:
displacement variation: regulating the real-time displacement of the main pump to be the displacement of the through pipe;
rotational speed variation: 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, the M2 mode is entered, and the controller generates the following corresponding displacement and rotating speed change instructions:
Displacement variation: and controlling the variable mechanism to reduce 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 smaller than or equal to the displacement of the through pipe, and executing according to the real-time displacement of the original main pump if the real-time displacement of the original main pump is smaller than or equal to the displacement of the through pipe.
Rotational speed variation: if the real-time displacement of the main pump is smaller than or equal to the displacement of the through pipe and the pumping pressure is still larger than 250bar, adjusting the real-time rotating speed of the engine to a first target rotating speed;
when the pumping pressure changes 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 rotating speed change instructions:
displacement variation: and the control 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 smaller than or equal to the displacement of the through pipe, and if the real-time displacement of the original main pump is smaller than or equal to the displacement of the through pipe, the control variable mechanism is executed according to the real-time displacement of the original main pump.
Rotational speed variation: if the real-time displacement of the main pump is smaller than or equal to the displacement of the through pipe and the pumping pressure is still larger than 250bar, adjusting 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 pump enters an M4 mode, and the controller generates the following corresponding displacement and rotating speed change instructions:
Displacement variation: step adjustment is carried out according to the gear of the set displacement, wherein the steps are divided into a fourth step value d4 percent (30 percent), a third step value d3 percent (20 percent), a second step value d2 percent (10 percent) and a first step value d1 percent (5 percent);
the step adjustment means: decreasing according to the set displacement step, and when the set displacement is a fourth gear (preferably 80% -100%), reducing the real-time displacement of the main pump by the displacement of a fourth step value D4% (30%) in each stroke until the real-time displacement of the main pump is smaller than or equal to the through pipe displacement D1% (preferably 25%); when the displacement is set to be a third gear (preferably 60% -80%), reducing the real-time displacement of the main pump by the displacement of a third step value D3% (20%) per stroke until the real-time displacement of the main pump is smaller than or equal to the through pipe displacement D1% (preferably 25%); when the displacement is set to be the second gear (preferably 40% -60%), reducing the real-time displacement of the main pump by the displacement of a second step value D2% (10%) per stroke until the real-time displacement of the main pump is smaller than or equal to the through pipe displacement D1% (preferably 25%); when the set displacement is smaller than 40% of the first gear, reducing the real-time displacement of the main pump by the displacement of a first step value D1% (5%) in each stroke until the real-time displacement of the main pump is smaller than or equal to the through pipe displacement D1% (preferably 25%);
Rotational speed variation: if the real-time displacement of the main pump is smaller than or equal to the displacement of the through pipe and the pumping pressure is still larger than 250bar, adjusting the real-time rotating speed of the engine to a first target rotating speed;
and when the pumping pressure reaches 350bar and lasts for 20 seconds, the mode M5 is entered, the controller outputs a system pressure high alarm signal, the engine is controlled to recover idling, and the main pump displacement is reduced to the minimum displacement.
Further, 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 reversing periods, and the through pipe displacement is 25%.
In a second aspect, the invention provides a control method for a pre-blocking prevention pipe of a concrete pumping machine, which comprises the following steps:
acquiring operation parameters of the concrete pumping machine;
and controlling the action of the engine and the variable mechanism according to the operation parameters so as to prevent or reduce the pipe blockage.
Further, the operation parameters comprise the state of a pumping switch and the real-time rotating speed of a transmitter, and the set displacement;
the method for controlling the actions of the engine and the variable mechanism according to the operation parameters comprises the following steps:
when the pumping stop time exceeds the preset 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 the real-time displacement of the main pump to be the through pipe displacement, wherein the process lasts for a preset through pipe reversing period;
After the through pipe reversing period is executed, the real-time displacement of the main pump is adjusted to be set displacement;
in the waiting process, if a pump worker manually operates the reverse pump, the pumping stop time is recalculated, and when the reverse pump is ended, the pumping stop time is calculated again.
Further, the method for controlling the actions of the engine and the variable mechanism according to the operation parameters comprises the following steps:
according to the pumping pressure, entering an anti-blocking pipe mode; in the anti-blocking pipe mode, the engine speed and the pumping displacement are adjusted according to preset logic;
monitoring the pumping pressure is continued, and if the pumping pressure is not more than 250bar and the duration exceeds 30 seconds, the anti-blocking pipe mode is exited, and the normal pumping mode is entered.
Further, the anti-blocking mode comprises 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 preset logic comprises the following steps:
when the pumping pressure change reaches 300bar, the M1 mode is entered, and the controller generates the following corresponding displacement and rotating speed change instructions:
displacement variation: regulating the real-time displacement of the main pump to be the displacement of the through pipe;
rotational speed variation: 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, the M2 mode is entered, and the controller generates the following corresponding displacement and rotating speed change instructions:
displacement variation: and controlling the variable mechanism to reduce 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 smaller than or equal to the displacement of the through pipe, and executing according to the real-time displacement of the original main pump if the real-time displacement of the original main pump is smaller than or equal to the displacement of the through pipe.
Rotational speed variation: if the real-time displacement of the main pump is smaller than or equal to the displacement of the through pipe and the pumping pressure is still larger than 250bar, adjusting the real-time rotating speed of the engine to a first target rotating speed;
when the pumping pressure changes 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 rotating speed change instructions:
displacement variation: and the control 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 smaller than or equal to the displacement of the through pipe, and if the real-time displacement of the original main pump is smaller than or equal to the displacement of the through pipe, the control variable mechanism is executed according to the real-time displacement of the original main pump.
Rotational speed variation: if the real-time displacement of the main pump is smaller than or equal to the displacement of the through pipe and the pumping pressure is still larger than 250bar, adjusting 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 pump enters an M4 mode, and the controller generates the following corresponding displacement and rotating speed change instructions:
displacement variation: step adjustment is carried out according to the gear of the set displacement, wherein the steps are divided into a fourth step value d4 percent (30 percent), a third step value d3 percent (20 percent), a second step value d2 percent (10 percent) and a first step value d1 percent (5 percent);
the step adjustment means: decreasing according to the set displacement step, and when the set displacement is a fourth gear (preferably 80% -100%), reducing the real-time displacement of the main pump by the displacement of a fourth step value D4% (30%) in each stroke until the real-time displacement of the main pump is smaller than or equal to the through pipe displacement D1% (preferably 25%); when the displacement is set to be a third gear (preferably 60% -80%), reducing the real-time displacement of the main pump by the displacement of a third step value D3% (20%) per stroke until the real-time displacement of the main pump is smaller than or equal to the through pipe displacement D1% (preferably 25%); when the displacement is set to be the second gear (preferably 40% -60%), reducing the real-time displacement of the main pump by the displacement of a second step value D2% (10%) per stroke until the real-time displacement of the main pump is smaller than or equal to the through pipe displacement D1% (preferably 25%); when the displacement is set to be a first gear (preferably less than 40%), reducing the real-time displacement of the main pump by the displacement of a first step value D1% (5%) per stroke until the real-time displacement of the main pump is less than or equal to the through pipe displacement D1% (preferably 25%);
Rotational speed variation: if the real-time displacement of the main pump is smaller than or equal to the displacement of the through pipe and the pumping pressure is still larger than 250bar, adjusting the real-time rotating speed of the engine to a first target rotating speed;
and when the pumping pressure reaches 350bar and lasts for 20 seconds, the mode M5 is entered, the controller outputs a system pressure high alarm signal, the engine is controlled to recover idling, and the main pump displacement is reduced to the minimum displacement.
Further, 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 reversing periods, and the through pipe displacement is 25%.
Compared with the prior art, the invention has the beneficial effects that:
1. the machine can automatically judge the pipe blocking condition, replaces manual judgment, reduces the operation difficulty, can automatically perform pipe blocking prevention operation, is timely in monitoring, quicker in response and more in executing and breaking, and ensures that the pipe blocking prevention operation is more automatic and intelligent and has stronger reliability.
2. The invention monitors parameters such as the state of a pumping switch, the pump stopping time, the pumping pressure change, the engine rotating speed, the displacement and the like of the concrete pumping machinery in real time, and executes corresponding strategies according to preset logic so as to achieve the purpose of preventing or reducing pipe blockage.
3. When the pump stopping time exceeds the set time, the pump is started again to enter a through pipe mode, so that the pipe blockage caused by concrete segregation or solidification in the conveying pipe is prevented;
4. according to the invention, all load change conditions are divided into a plurality of types (not limited to five types), which type is automatically judged according to the load change and corresponding adjustment is carried out; the threshold value is adjustable, can accord with multiple operating mode, has more 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 an anti-blocking mode.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
In the description of the present embodiment, it should be noted that, if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like are presented, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, only for convenience of describing the present embodiment and simplifying the description, and does not indicate or imply that the indicated apparatus or element must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present embodiment.
Embodiment one:
the embodiment provides a concrete pumping machine which is used for conveying concrete to a specified position through pressure and comprises a main pump, a pressure sensor, a controller, an engine, a rotation speed sensor, a variable mechanism for controlling real-time displacement 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 operating parameters include the state of the pumping switch, pumping pressure, rotational speed of the engine, real-time displacement of the main pump, and 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 a swash plate of the main pump is adjusted through the variable mechanism, so that the real-time displacement of the main pump output by the main pump is regulated.
The main pump is a swash plate type axial plunger variable 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 conveying end of the main pump and is used for collecting pumping pressure of the main pump and conveying 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 used for controlling the real-time displacement 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 remote control displacement knob, and the set displacement representing input is 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 mechanism is equal to the input set displacement. The remote controller displacement knob is also connected with the controller, and is used for conveying the set displacement and the real-time displacement of the main pump to the controller.
The engine is connected with the main pump and is 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 regulating 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 inconsistent, regulating the real-time rotating speed until the real-time rotating speed is equal to the target rotating speed, wherein the error of 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, regulating. This is favorable to balanced control accuracy and cost, reduces the cost as far as possible under the prerequisite of guaranteeing control accuracy.
The output end of the controller is connected with the variable mechanism and the engine. A timer is arranged in the controller, the controller acquires the pumping stop time of the main pump by analyzing the state of the pumping switch, and meanwhile, the controller acquires the pumping pressure change by analyzing the pumping pressure. The controller enters different working modes according to the pumping stop time, the pumping pressure change, the set displacement and the real-time displacement of the main pump.
The concrete pumping machine has three working modes: normal pumping mode, through-pipe mode, and anti-pipe-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 pumping pressure of the main pump, and controls the variable mechanism and the engine to operate according to a preset program, so that different rotation speeds and displacements are realized, and the occurrence of pipe blockage is prevented.
Pipe mode: the through pipe mode has the function of preventing the concrete in the conveying pipe from being immobilized for a long time when waiting for the stirring machine to cause pipe blockage when being pumped again. When the pump stop time exceeds T minutes (preferably 15 minutes) and pumping is again initiated, the controller automatically enters the through-line mode, adjusts the engine to R1 revolutions (preferably 1450 revolutions) and adjusts the real-time displacement of the main pump to through-line displacement D1% (preferably 25%), which lasts n (preferably 5) commutation cycles.
And after the execution of the through pipe mode is finished, automatically exiting the through pipe mode, and entering a normal pumping state for working. In the waiting process, if a pump worker manually operates the reverse pump, the waiting time is recalculated, and the reverse pump is restarted when the reverse pump is ended. All the numbers indicated by the letters can be adjusted, and the preferred number is better.
The flow of the pipe mode is shown in fig. 1.
Anti-blocking pipe mode: the treatment processes are classified into five types, respectively M1, M2, M3, M4, M5, according to the pumping pressure and the set displacement. The pumping pressure is in bar, 1 bar (bar) =100 kilopascals (kPa) =10 newtons per square centimeter (10N/cm 2) =0.1 MPa.
M1: the pumping pressure change (within one stroke) after pumping is started reaches P3bar (preferably 300 bar). The corresponding displacement and rotational speed changes performed by the controller are as follows:
displacement variation: the control variable mechanism adjusts the real-time displacement of the main pump to the through pipe displacement D1% (preferably 25%).
Rotational speed variation: the engine speed is adjusted to R1 revolutions (preferably 1450 revolutions per minute). And when the rotating speed is regulated, comparing the real-time rotating speed with the target rotating speed, if the real-time rotating speed is inconsistent, regulating 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, regulating.
M2: the pumping pressure is continuously varied by n2 (preferably 3) strokes and exceeds P2bar (preferably 270 bar) to P4bar (preferably 350 bar). The corresponding displacement and rotational speed changes performed by the controller are as follows:
displacement variation: the control 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 is executed according to the real-time displacement of the main pump if the real-time displacement of the main pump < =d1% (preferably 25%).
Rotational speed variation: if the real-time displacement of the main pump < = through-tube displacement D1% (preferably 25%), the pumping pressure is still greater than P1bar (preferably 250 bar), the engine speed is adjusted to R1 revolution (preferably 1450 revolution).
M3: the pumping pressure varies over P3bar (preferably 50 bar) and is between P2bar and P4bar (preferably 270bar and 350 bar). The controller performs the corresponding displacement and rotational speed changes as follows:
displacement variation: the control variable mechanism reduces the displacement of D4% (preferably 30%) on the basis of the current real-time displacement of the main pump on the next stroke until the real-time displacement of the main pump reaches D1% (preferably 25%).
Rotational speed variation: if the real-time displacement of the main pump < = through-tube displacement D1% (preferably 25%), the pumping pressure is still greater than P1bar (preferably 250 bar), the engine speed is adjusted to R1 revolution (preferably 1450 revolution).
M4: the pumping pressure reaches P4bar (preferably 300 bar) during pumping. The controller performs the corresponding displacement and rotational speed changes as follows:
displacement variation: the gear is adjusted according to the gear steps of the set displacement, and the steps are divided into a fourth step value d4 percent (30 percent), a third step value d3 percent (20 percent), a second step value d2 percent (10 percent) and a first step value d1 percent (5 percent). The step adjustment means: decreasing according to the set displacement step, and when the set displacement is a fourth gear (preferably 80% -100%), reducing the real-time displacement of the main pump by the displacement of a fourth step value D4% (30%) in each stroke until the real-time displacement of the main pump is smaller than or equal to the through pipe displacement D1% (preferably 25%); when the displacement is set to be a third gear (preferably 60% -80%), reducing the real-time displacement of the main pump by the displacement of a third step value D3% (20%) per stroke until the real-time displacement of the main pump is smaller than or equal to the through pipe displacement D1% (preferably 25%); when the displacement is set to be the second gear (preferably 40% -60%), reducing the real-time displacement of the main pump by the displacement of a second step value D2% (10%) per stroke until the real-time displacement of the main pump is smaller than or equal to the through pipe displacement D1% (preferably 25%); when the set displacement is smaller than 40% of the first gear, reducing the real-time displacement of the main pump by the displacement of a first step value D1% (5%) in each stroke until the real-time displacement of the main pump is smaller than or equal to the through pipe displacement D1% (preferably 25%);
Rotational speed variation: if the real-time displacement of the main pump < = through-tube displacement D1% (preferably 25%), the pumping pressure is still greater than P1bar (preferably 250 bar), the engine speed is adjusted to R1 revolution (preferably 1450 revolution).
M5: the pumping pressure reaches P5bar (preferably 350 bar) for T3 (preferably 20 seconds), the controller executes corresponding processing measures to output a system pressure high alarm signal, the engine is controlled to restore idling, and the main pump displacement is reduced to the minimum displacement.
The flow of the anti-blocking mode is shown in fig. 2. All data of the embodiment are optimized through practical inspection, the occurrence of the pre-blocking prevention pipe is facilitated, the judgment accuracy and the measure timeliness are improved, the danger of the blocking pipe is eliminated in a sprouting state, the reaction is quicker, the execution is more broken, the blocking prevention pipe operation is more automatic and intelligent, and the reliability is stronger.
After entering the anti-blocking pipe mode, the engine speed and the pumping displacement are adjusted according to preset logic, monitoring is continuously carried out, if the pumping pressure is smaller than P1bar (preferably 250 bar) and the duration exceeds t seconds (preferably 30 seconds), the controller exits the anti-blocking pipe mode, namely, the controller controls a variable mechanism to enable the real-time displacement of the main pump to recover 5% of the displacement of each stroke until the displacement is recovered to the set displacement, and the normal pumping mode is entered. If the pressure exceeds P2bar (preferably 270 bar) in the recovery process, the real-time displacement of the main pump is controlled to stop rising, and if the displacement is manually increased by a pump worker in the execution process of the anti-blocking pipe, the displacement is increased on the basis of the real-time displacement of the main pump according to the difference value between the set displacement and the real-time displacement 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 blocking condition can be automatically judged, manual judgment is replaced, and the operation difficulty is reduced. And can prevent stifled pipe operation automatically, the control is more timely, and the reaction is more rapid, carries out more broken, makes prevent stifled pipe operation more automatic, intelligent, and the reliability is stronger.
The implementation principle is as follows: 1. the state of a pumping switch, the pump stopping time, the pumping pressure change, the engine rotating speed, the displacement and other parameters of the concrete pumping machinery are monitored in real time, and corresponding strategies are executed according to preset logic, so that the aim of preventing or reducing pipe blockage is fulfilled.
2. When the pump stopping time exceeds the set time, the pump is started again to enter a through pipe mode, so that the pipe blockage caused by concrete segregation or solidification in the conveying pipe is prevented;
3. dividing all load change conditions into a plurality of types (not limited to five types), and automatically judging which type the controller belongs to according to the load change and correspondingly adjusting the load change conditions;
4. the threshold value is adjustable, can accord with multiple operating mode, has more practicality.
5. The control method is suitable for all concrete pumping machines.
Embodiment two:
the embodiment provides a control method for pumping mechanical anti-blocking pipes, which selects different mode treatments according to operation parameters so as to prevent the occurrence of pipe blocking. The operating parameters mainly comprise the state of a pumping switch, pumping pressure, real-time rotating speed of an engine, real-time displacement of a main pump and set displacement.
The pumping stop time is obtained according to the state of the pumping switch. The state of the pumping switch is acquired through the pumping switch, the pumping pressure is acquired through the pressure sensor, and the pumping speed sensor is used for acquiring the pumping pressure
The whole control method for preventing the pipe from being blocked 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.
Pipe mode: the through pipe mode has the function of preventing the concrete in the conveying pipe from being blocked when being pumped again after being immobilized for a long time when the time for waiting for the stirring is too long. When pumping is stopped for more than T minutes (preferably 15 minutes) and pumping is started again, the through-pipe mode is automatically entered, the engine is adjusted to R1 rotation (preferably 1450 rotation) and the real-time displacement of the main pump is adjusted to D1% (preferably 25%) through-pipe displacement, which lasts n (preferably 5) commutation cycles.
And after the execution of the through pipe mode is finished, automatically exiting the through pipe mode, and entering a normal pumping state for working. In the waiting process, if a pump worker manually operates the reverse pump, the waiting time is recalculated, and the reverse pump is restarted when the reverse pump is ended.
The flow of the pipe mode is shown in fig. 1.
Anti-blocking pipe mode: the treatment processes are classified into five types, respectively M1, M2, M3, M4, M5, according to the pumping pressure and the set displacement. The pumping pressure is in bar, 1 bar (bar) =100 kilopascals (kPa) =10 newtons per square centimeter (10N/cm 2) =0.1 MPa.
M1: the pumping pressure change (in one stroke) after pumping is started up to P3bar (preferably 300 bar), the corresponding displacement and rotation speed changes are performed as follows:
displacement variation: the control variable mechanism adjusts the real-time displacement of the main pump to the through pipe displacement D1% (preferably 25%).
Rotational speed variation: the engine speed is adjusted to R1 revolutions (preferably 1450 revolutions per minute). And when the rotating speed is regulated, comparing the real-time rotating speed with the target rotating speed, if the real-time rotating speed is inconsistent, regulating 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, regulating.
M2: the pumping pressure is continuously varied by n2 (preferably 3) strokes and exceeds P2bar (preferably 270 bar) to P4bar (preferably 350 bar), the corresponding displacement and rotation speed variation being performed as follows:
displacement variation: the control 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 is executed according to the real-time displacement of the main pump if the real-time displacement of the main pump < =d1% (preferably 25%).
Rotational speed variation: if the real-time displacement of the main pump < = through-tube displacement D1% (preferably 25%), the pumping pressure is still greater than P1bar (preferably 250 bar), the engine speed is adjusted to R1 revolution (preferably 1450 revolution).
M3: the pumping pressure varies over P3bar (preferably 50 bar) and the pumping pressure is between P2bar and P4bar (preferably 270bar and 350 bar), the corresponding displacement and rotation speed variations being performed as follows:
displacement variation: the control variable mechanism reduces the displacement of D4% (preferably 30%) on the basis of the current real-time displacement of the main pump on the next stroke until the real-time displacement of the main pump reaches D1% (preferably 25%).
Rotational speed variation: if the real-time displacement of the main pump < = through-tube displacement D1% (preferably 25%), the pumping pressure is still greater than P1bar (preferably 250 bar), the engine speed is adjusted to R1 revolution (preferably 1450 revolution).
M4: the pumping pressure reaches P4bar (preferably 300 bar) during pumping, and the corresponding displacement and rotation speed changes are performed as follows:
displacement variation: the gear is adjusted according to the gear steps of the set displacement, and the steps are divided into a fourth step value d4 percent (30 percent), a third step value d3 percent (20 percent), a second step value d2 percent (10 percent) and a first step value d1 percent (5 percent). The step adjustment means: decreasing according to the set displacement step, and when the set displacement is a fourth gear (preferably 80% -100%), reducing the real-time displacement of the main pump by the displacement of a fourth step value D4% (30%) in each stroke until the real-time displacement of the main pump is smaller than or equal to the through pipe displacement D1% (preferably 25%); when the displacement is set to be a third gear (preferably 60% -80%), reducing the real-time displacement of the main pump by the displacement of a third step value D3% (20%) per stroke until the real-time displacement of the main pump is smaller than or equal to the through pipe displacement D1% (preferably 25%); when the displacement is set to be the second gear (preferably 40% -60%), reducing the real-time displacement of the main pump by the displacement of a second step value D2% (10%) per stroke until the real-time displacement of the main pump is smaller than or equal to the through pipe displacement D1% (preferably 25%); when the displacement is set to be a first gear (preferably less than 40%), reducing the real-time displacement of the main pump by the displacement of a first step value D1% (5%) per stroke until the real-time displacement of the main pump is less than or equal to the through pipe displacement D1% (preferably 25%);
Rotational speed variation: if the real-time displacement of the main pump < = through-tube displacement D1% (preferably 25%), the pumping pressure is still greater than P1bar (preferably 250 bar), the engine speed is adjusted to R1 revolution (preferably 1450 revolution).
M5: the pumping pressure reaches P5bar (preferably 350 bar) for T3 (preferably 20 seconds) and the corresponding treatment measures are performed: and outputting a high-pressure alarm signal of the system to stop the main pump.
The flow of the anti-blocking mode is shown in fig. 2.
After entering the anti-blocking pipe mode, the engine speed and the pumping displacement are adjusted according to preset logic, and the monitoring is continuously carried out, and if the pumping pressure < = P1bar (preferably 250 bar) and the duration exceeds t seconds (preferably 30 seconds), the normal pumping is carried out after exiting the anti-blocking pipe mode.
According to the technical scheme, the pipe blocking condition can be automatically judged, manual judgment is replaced, and the operation difficulty is reduced. And can prevent stifled pipe operation automatically, the control is more timely, and the reaction is more rapid, carries out more broken, makes prevent stifled pipe operation more automatic, intelligent, and the reliability is stronger.
The reasons for plugging pipes are generally divided into four types:
firstly, concrete in a pump truck conveying pipe is not pumped for a long time, the connection time between the mixer truck and the mixer truck is probably too long, after the last mixer truck is discharged, the next mixer truck takes a long time, so that the concrete does not move in the pump pipe for a long time, the concrete segregation is easily caused, and the pipe blockage is mostly caused.
Secondly, the workability of the concrete is poor, the workability of the concrete comprises parameters related to the working properties of the concrete, such as flowability, water retention and the like of the concrete, the workability is poor, the flowability of the concrete is very poor, the concrete is too dry or too wet, the pump truck concrete cylinder is easy to suck empty, and the resistance of the concrete in a pump pipe is larger due to the poor workability, so that the pipe is easy to be blocked. However, the workability of the concrete is mainly determined by the proportion, and the water content of the sand and stone materials is changed due to weather reasons, so that the workability of the concrete is affected.
Thirdly, the piston of the pump truck is seriously worn, so that the piston of the concrete cylinder is seriously worn, the suction property of concrete is poor, the pumping pressure is insufficient, water in the concrete can run into a middle water tank, and the fluidity of the concrete is poor.
Fourthly, the operation is improper, namely firstly, the arm support of the concrete pump truck is ensured to be fully unfolded and in an arc shape as far as possible when the angle of the arm support is not controlled improperly, and the arm support is not required to be kept in a folded state when the pump truck is in dry operation, so that the angle of an elbow at the joint of the arm support and the arm support is easy to cause, the resistance of concrete in a pump pipe is increased, namely, a pipeline with the pump truck vertically downward is increased, or a segregation device with fortification is required to be installed under the working condition of vertically upward so as to prevent the situation of pipe blockage in advance; secondly, the pumping speed is improperly regulated, the speed is critical to select during pumping, and operators cannot get a map quickly, and sometimes the speed is not reached. When the pump is used for pumping for the first time, the pumping speed can be properly increased after the pump is normally pumped because the resistance of the pipeline is larger and the pump is required to be pumped at a low speed; finally, when the excess material is not properly controlled and pumped, operators need 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 small, air is easily sucked, so that the pipe is blocked.
Based on this, the key point of the inventive concept is:
1. the state of a pumping switch, the pump stopping time, the pumping pressure change, the engine rotating speed, the displacement and other parameters of the concrete pumping machinery are monitored in real time, and corresponding strategies are executed according to preset logic, so that the aim of preventing or reducing pipe blockage is fulfilled.
2. When the pump stopping time exceeds the set time, the pump is started again to enter a through pipe mode, so that the pipe blockage caused by concrete segregation or solidification in the conveying pipe is prevented;
3. dividing all load change conditions into a plurality of types (not limited to five types), and automatically judging which type the controller belongs to according to the load change and correspondingly adjusting the load change conditions;
4. the threshold value is adjustable, can accord with multiple operating mode, has more practicality.
5. The control method is suitable for all concrete pumping machines.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature, and in the description of the invention, "a plurality" means two or more, unless otherwise specifically and clearly defined.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., 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 present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. 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 will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives, and variations may be made in the above embodiments by those skilled in the art without departing from the spirit and principles of the invention.
Claims (4)
1. The 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 the main pump and used for controlling and regulating the real-time displacement 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 is used for acquiring the operation parameters of the concrete pumping machinery in real time and controlling the actions of the engine and the variable mechanism according to the operation parameters so as to prevent or reduce pipe blockage;
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 start and stop of pumping; 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 regulate the real-time rotating speed of the engine; the controller is connected with the variable mechanism to control and regulate the real-time displacement of the main pump;
when the pumping stop time exceeds the preset waiting time and pumping is started again, the controller enters a through pipe mode, namely 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 displacement of the main pump to be the through pipe displacement, and the process lasts for a preset through pipe reversing period; after the execution of the through pipe mode is finished, the controller automatically exits the through pipe mode and enters a normal pumping mode, and the controller adjusts the real-time displacement of the main pump to set displacement; in the waiting process, if a pump worker manually operates the reverse pump, the pumping stop time is recalculated, and when the reverse pump is finished, the pumping stop time is recalculated;
The operating parameters further include pumping pressure and set displacement;
the controller is connected with a remote controller, and a displacement adjusting knob is arranged on the remote controller and is used for inputting set displacement;
the conveying end of the main pump is provided with a pressure sensor, and the pumping pressure of the main pump is conveyed to the controller through being connected with the input end of 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;
the controller continuously monitors 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 the real-time displacement of the main pump is adjusted to be set displacement;
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 change reaches 300bar, the controller adjusts the real-time displacement of the main pump to be the through pipe displacement, and adjusts the real-time rotating speed of the engine to be a first target rotating speed;
when the pumping pressure continuously changes for 3 strokes and the pumping pressure is between 270bar and 350bar, the controller controls the variable mechanism to reduce the displacement of 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 smaller than or equal to the displacement of the through pipe, and if the real-time displacement of the original main pump is smaller than or equal to the displacement of the through pipe, the variable mechanism is executed according to the real-time displacement of the original main pump; if the real-time displacement of the main pump is smaller than or equal to the displacement 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 by more than 50bar and the pumping pressure is between 270bar and 350bar, the controller controls the variable mechanism to reduce the displacement of 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 variable mechanism is executed according to the real-time displacement of the original main pump; if the real-time displacement of the main pump is smaller than or equal to the displacement 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 adjusts according to a gear step of the set displacement, the set displacement decreases according to steps, and when the set displacement is a fourth gear, the real-time displacement of the main pump is reduced by the displacement of a fourth step value every stroke until the real-time displacement of the main pump is smaller than or equal to the displacement of the through pipe; when the displacement is set to be a third gear, reducing the real-time displacement of the main pump by the displacement of a third step value in each stroke until the real-time displacement of the main pump is smaller than or equal to the displacement of the through pipe; when the displacement is set to be the second gear, reducing the real-time displacement of the main pump by the displacement of a second step value in each stroke until the real-time displacement of the main pump is smaller than or equal to the displacement of the through pipe; when the displacement is set to be a first gear, reducing the real-time displacement of the main pump by the displacement of a first step value in each stroke until the real-time displacement of the main pump is smaller than or equal to the displacement of the through pipe; if the real-time displacement of the main pump is smaller than or equal to the displacement 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 system pressure high alarm signal and controls the engine to recover idling, and the real-time displacement of the main pump is reduced to the minimum displacement.
2. The concrete pumping machine of claim 1, wherein 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 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%.
3. The control method of the pre-blocking prevention pipe of the concrete pumping machinery is characterized by comprising the following steps of:
acquiring operation parameters of the concrete pumping machine;
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 and the real-time rotating speed of a transmitter;
the method for controlling the actions of the engine and the variable mechanism according to the operation parameters comprises the following steps:
When the pumping stop time exceeds the preset 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 displacement of the main pump to be the through pipe displacement, wherein the process lasts for a preset through pipe reversing period;
after the through pipe reversing period is executed, the real-time displacement of the main pump is adjusted to be set displacement;
in the waiting process, if a pump worker manually operates the reverse pump, the pumping stop time is recalculated, and when the reverse pump is finished, the pumping stop time is recalculated;
the operating parameters further include pumping pressure and set displacement;
according to the pumping pressure and the set displacement, adjusting the engine speed and the pumping displacement according to preset logic;
continuously monitoring the pumping pressure, and if the pumping pressure is not more than 250bar and the duration exceeds 30 seconds, adjusting the real-time displacement of the main pump to be the set displacement;
the method for adjusting the real-time rotating speed of the engine and the real-time displacement of the main pump according to the preset logic comprises the following steps:
when the pumping pressure change reaches 300bar, regulating the real-time displacement of the main pump to be the through pipe displacement, and regulating the real-time rotating speed of the engine to be a first target rotating speed;
when the pumping pressure continuously changes for 3 strokes and the pumping pressure is between 270bar and 350bar, the controller controls the variable mechanism to reduce the displacement of 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 smaller than or equal to the displacement of the through pipe, and if the real-time displacement of the original main pump is smaller than or equal to the displacement of the through pipe, the variable mechanism is executed according to the real-time displacement of the original main pump; if the real-time displacement of the main pump is smaller than or equal to the displacement 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 by more than 50bar and the pumping pressure is between 270bar and 350bar, the controller controls the variable mechanism to reduce the displacement of 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 variable mechanism is executed according to the real-time displacement of the original main pump; if the real-time displacement of the main pump is smaller than or equal to the displacement 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 adjusts according to a gear step of the set displacement, the set displacement decreases according to steps, and when the set displacement is a fourth gear, the real-time displacement of the main pump is reduced by the displacement of a fourth step value every stroke until the real-time displacement of the main pump is smaller than or equal to the displacement of the through pipe; when the displacement is set to be a third gear, reducing the real-time displacement of the main pump by the displacement of a third step value in each stroke until the real-time displacement of the main pump is smaller than or equal to the displacement of the through pipe; when the displacement is set to be the second gear, reducing the real-time displacement of the main pump by the displacement of a second step value in each stroke until the real-time displacement of the main pump is smaller than or equal to the displacement of the through pipe; when the displacement is set to be a first gear, reducing the real-time displacement of the main pump by the displacement of a first step value in each stroke until the real-time displacement of the main pump is smaller than or equal to the displacement of the through pipe; if the real-time displacement of the main pump is smaller than or equal to the displacement 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 system pressure high alarm signal and controls the engine to recover idling, and the displacement of the main pump is reduced to the minimum displacement.
4. The control method for the pre-blocking prevention pipe of the concrete pumping machine according to claim 3, wherein 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 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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| WO2018130913A2 (en) * | 2017-01-15 | 2018-07-19 | Butler Michael George | Apparatuses and systems for and methods of generating and placing zero-slump-pumpable concrete |
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