WO2014000388A1

WO2014000388A1 - Pump stroke control method for twin-cylinder pump and pumping device

Info

Publication number: WO2014000388A1
Application number: PCT/CN2012/086118
Authority: WO
Inventors: 裴杰; 万梁; 王佳茜; 陈祺; 化世阳
Original assignee: 中联重科股份有限公司
Priority date: 2012-06-27
Filing date: 2012-12-07
Publication date: 2014-01-03
Also published as: CN103114980A; CN103114980B

Abstract

A pump stroke control method for twin-cylinder pump, comprising the following steps: first, while a twin-cylinder pump is in operating mode, detecting and obtaining the operating load pressure of same; second, determining, according to said operating load pressure, a target pump stroke corresponding to said operating load pressure; third, by means of adjusting the volume of hydraulic oil in a through-cavity (5 ) of the twin-cylinder pump, adjusting the actual pump stroke (L) of said pump to said target pump stroke. Also provided is a pumping device. On the basis of the operating load pressure directly relating to the operating circumstances of a twin-cylinder pump, the present method adaptively adjusts the pump stroke of said pump, thus allowing the materials-conveying cylinder effectively to avoid a situation of insufficient materials uptake, and thereby increasing pump uptake efficiency while saving energy. The pumping device is structurally simple, easy to operate and low in cost.

Description

Pumping stroke control method of double cylinder pump and pumping equipment

Technical field

The present invention relates to a pumping control method, and in particular to a pumping stroke control method for a two-cylinder pump. Further, the present invention relates to a pumping apparatus to which the pumping stroke control method is applied. Background technique

Mud, concrete, mortar and other materials are commonly used construction materials in engineering and construction. Double-cylinder pumps such as concrete pumps (also called "concrete pump" or "concrete pumping device") are widely used in engineering construction. The construction machinery used, the main structure of the two-cylinder pump is similar to the commonly used concrete pump, for example, which mainly uses pressure to continuously transport the fluid material along the pipeline. Generally, the hydraulic pump can be driven by the electric motor (or internal combustion engine) to form a hydraulic pressure with a certain pressure. The oil, driving the main cylinder drives the pistons in the two concrete conveying cylinders to alternately reciprocate, so that the fluid material is continuously sucked from the hopper into the concrete conveying cylinder and transported to the construction site through the conveying pipeline.

In order to facilitate understanding, the following briefly describes the main structure of the two-cylinder pump and its disadvantages by taking a concrete pump as an example.

Specifically, the concrete pump generally includes two main cylinders (also referred to as "master cylinders"), two concrete delivery cylinders (also known as "cylinders" by those skilled in the art), two concrete pistons, and two swing cylinders. (the so-called "pendulum cylinder"), hopper and distribution valve (such as S-shaped distribution valve), wherein the rodless chambers of the two main cylinders are connected to each other, and the rod chambers are respectively connected to the reversing valve, the reversing valve Connected to the oil inlet passage and the oil tank, and selectively exchanges the rod chamber of the first main cylinder of the two main cylinders with the oil inlet passage by the reversing of the reversing valve, and the second main cylinder has The rod cavity is in communication with the oil tank, or the rod chamber of the first main cylinder is communicated with the oil tank, and the rod chamber of the second main cylinder is in communication with the oil inlet oil passage. Since the rodless chambers of the two main cylinders communicate with each other and the hydraulic oil is closed, the hydraulic oil in the rodless chambers of the two main cylinders acts as a transmission medium by alternately feeding the rod chambers of the two main cylinders. The oil thus enables the alternating expansion and contraction of the two main cylinders. Two concrete pistons are respectively located in the two concrete delivery cylinders and are respectively connected to the piston rods of the main cylinders. When starting work, the distribution valve is first moved to the first position under the hydraulic pressure of the pendulum valve cylinder, so that the nozzle of the first concrete delivery cylinder communicates with the concrete conveying pipe via the distribution valve, and the mouth of the second concrete conveying cylinder Communicating with the hopper inlet, at which time hydraulic oil enters the rod cavity of the second main cylinder, so that the piston rod of the second main cylinder is retracted, the piston rod of the first main cylinder is extended, and the piston of the first main cylinder The rod pushes the concrete piston in the first concrete conveying cylinder, so that the concrete in the first concrete conveying cylinder is pumped out through the distribution valve, and at the same time The retraction of the piston rod of the two main cylinders causes the concrete piston in the second concrete conveying cylinder to retract, thereby forming a vacuum in the second concrete conveying cylinder, and sucking the concrete from the hopper into the second concrete conveying cylinder, so that the reciprocating Alternate work to achieve continuous pumping of concrete. It should be noted that the two main cylinders are not limited to the case where the rodless chambers communicate with each other to form a communication chamber. Alternatively, the rod chambers of the two main cylinders may be connected to each other to form a communication chamber. Form, in this case the rodless chambers of the two main cylinders respectively form a drive chamber and are connected to the reversing valve.

However, the above-mentioned prior art concrete pumping basically uses a fixed stroke to pump the concrete. In the actual use process, the fixed stroke is adopted due to different parameters such as the viscosity and slump of the fluid concrete in different working processes. When the concrete pump is pumped, the concrete delivery cylinder has insufficient suction in many working conditions, but the main cylinder and the concrete delivery cylinder still operate according to a fixed stroke, which greatly reduces the pumping efficiency of the concrete pump.

In addition, at present, some technicians have proposed to detect the displacement of the main cylinder, the concrete conveying cylinder and the swing cylinder in real time in the pumping control of the concrete pump. By real-time detecting the displacement signal of the cylinder, the main cylinder reversing and swinging cylinder changing are realized. Accurate control of the displacement of the oil pump, optimize system performance, and improve control accuracy. However, this type of control is only to optimize the overall performance of the concrete pump, and the control is complicated. It is not targeted for the problem that the concrete delivery tank has insufficient suction due to different concrete conditions, resulting in a decrease in pumping efficiency.

As can be seen from the above description, the main disadvantages of the prior art concrete pump are: When the concrete pump pumps fluid concrete with different material parameters, under certain working conditions, there will be insufficient suction of the concrete conveying cylinder, but the concrete There is no corresponding concrete pumping condition detection device in the pump, and the automatic detection function of the working condition cannot be realized. The main cylinder and the concrete delivery cylinder still operate according to one or two fixed strokes, resulting in low concrete pumping efficiency. The energy waste is large, resulting in better pumping and suction efficiency except for a few specific concrete conditions, and other working conditions are in a working state in which the pumping efficiency is lowered.

The above is only a concrete pump as an example to describe the disadvantages of the concrete pump when pumping concrete, but it is obvious that other two-cylinder pumps similar in construction to the concrete pump also have the above disadvantages when pumping the relevant fluid material. In view of this, it is necessary to design a new pumping control method for a two-cylinder pump and a pumping device. Summary of the invention

The technical problem to be solved by the present invention is to provide a pumping stroke control method for a two-cylinder pump. By the pumping stroke control method, a relatively appropriate pumping stroke can be selected under different pumping conditions of the two-cylinder pump. Thereby optimizing the pumping efficiency of the two-cylinder pump. Furthermore, the technical problem to be solved by the present invention is to provide a pumping stroke control method for a two-cylinder pump, which can adaptively automatically perform a pumping operation of a two-cylinder pump. The pumping stroke of the two-cylinder pump is adjusted to optimize the pumping efficiency of the two-cylinder pump.

In addition, the technical problem to be solved by the present invention is to provide a pumping device capable of adaptively automatically adjusting the pumping stroke of a two-cylinder pump during a pumping operation of a two-cylinder pump, thereby optimizing the two-cylinder The pumping efficiency of the pump.

In order to solve the above technical problem, the present invention provides a pumping stroke control method for a two-cylinder pump, which includes the following steps: First, detecting and obtaining a working load pressure of the two-cylinder pump during operation of the two-cylinder pump; Second, determining a target pumping stroke corresponding to the workload pressure according to the working load pressure of the two-cylinder pump; third, adjusting the volume of the hydraulic oil contained in the communication chamber of the two-cylinder pump The actual pumping stroke of the cylinder pump is adjusted to the target pumping stroke. Optionally, in the first step, the working load pressure of the concrete pump is a suction load pressure, a pump load pressure or a total load pressure.

Specifically, in the first step, the working load pressure of the two-cylinder pump is a suction load pressure, a pump load pressure or a total load pressure.

Specifically, in the first step, the working load pressure of the two-cylinder pump is a total load pressure, and the driving oil pressure on the first working oil passage or the second working oil passage of the two-cylinder pump is detected to determine The total load pressure.

Specifically, in the first step, the working load pressure of the two-cylinder pump is a pump load pressure, and the pump load pressure is determined by detecting the oil pressure in the communication chamber.

Specifically, in the first step, in the first step, the working load pressure of the two-cylinder pump is a suction load pressure, and the first working oil path or the second of the two-cylinder pump is detected. Driving oil pressure on the working oil line to determine the total load pressure, and determining the pump load pressure by detecting the oil pressure in the communication chamber, thereby calculating the total load pressure and the pump load pressure The difference determines the suction load pressure.

Preferably, in the second step, the target pumping trip is determined by querying a database or a data table based on the workload pressure obtained by the detection.

Optionally, in the third step, the actual pumping stroke of the initial operation of the two-cylinder pump is adjusted to be at a maximum pumping stroke, by reducing the volume of hydraulic oil in the communication chamber. The actual pumping stroke is increased to the target pumping stroke.

Preferably, in the third step, detecting the actual pumping stroke of the two-cylinder pump, and increasing the hydraulic oil in the communication chamber when the actual pumping stroke is greater than the target pumping stroke a volume that reduces the actual pumping stroke to the target pumping stroke; when the actual pumping stroke is less than the target pumping stroke, The actual pumping stroke is increased to the target pumping stroke by reducing the volume of hydraulic oil within the communication chamber.

Specifically, in the third step, the volume of the hydraulic oil in the communication chamber is continuously adjusted, and the actual pumping stroke of the two-cylinder pump is detected in real time until the actual pumping stroke is adjusted to the The target pumping stroke is stopped to adjust the volume of hydraulic oil in the communication chamber.

Optionally, in the third step, the volume of hydraulic oil added or decreased in the communication cavity is an absolute value of a difference between the actual pumping stroke and the target pumping stroke multiplied by the communication cavity a cross-sectional area, wherein when the communication chamber is formed by the first main cylinder of the two-cylinder pump and the rod-free chamber of the second main cylinder, the cross-sectional area of the communication chamber is equal to the first main cylinder or the a cross-sectional area of the rodless chamber of the two main cylinders; when the communication chamber is formed by the rod chambers of the first main cylinder and the second main cylinder, the cross-sectional area of the communication chamber is equal to the first main cylinder Or the cross-sectional area of the rod chamber of the second main cylinder minus the cross-sectional area of the piston rod of the first main cylinder or the second main cylinder.

Further, the pumping stroke control method of the two-cylinder pump further includes a fourth step, in which the actual pumping stroke after the adjustment of the two-cylinder pump is detected to determine the actual pumping after the adjustment The stroke is equal to the target pumping stroke.

Most preferably, in the first step, the workload pressure of the two-cylinder pump is detected and obtained by the workload pressure detecting device; in the second step, the workload obtained by the controller according to the detection is employed Pressure, determining the target pumping stroke corresponding to the workload pressure by querying a database in the controller; in the third step, the controller controls the pumping stroke adjusting device to pass the pumping stroke An adjustment device is provided to adjust the volume of hydraulic oil within the communication chamber.

Further, the present invention provides a pumping apparatus including a two-cylinder pump, wherein the pumping apparatus further includes a controller, a pumping stroke adjusting device for adjusting a volume of hydraulic oil in a communication chamber of the two-cylinder pump And a workload pressure detecting device for detecting a workload pressure of the two-cylinder pump, the controller being electrically connected to the workload pressure detecting device and the pumping stroke adjusting device, the controller determining according to the detection The workload pressure determines a target pumping stroke of the two-cylinder pump corresponding to the workload pressure, and further adjusts the volume of hydraulic oil contained in the communication chamber of the two-cylinder pump by controlling the pump stroke adjustment device Thereby adjusting the current actual pumping stroke of the two-cylinder pump to the target pumping stroke.

Specifically, the workload pressure detecting device includes an oil pressure sensor, and the working load pressure detecting device is respectively connected to the first working oil passage and the second working oil passage through a hydraulic pipeline, and/or the working load pressure detecting The device is in communication with the communication chamber through a hydraulic line.

Typically, the pumping stroke adjusting device includes a pumping device and a driving device of the pumping device, the control The controller is electrically connected to the driving device, and the pumping device is in communication with a communication chamber of the two-cylinder pump to selectively draw or inject hydraulic oil into the communication chamber.

Specifically, the pumping device is a metering pump, and the driving device is a motor.

Preferably, the pumping apparatus further includes a displacement sensor for detecting an actual pumping stroke of the two-cylinder pump. Specifically, the displacement sensor is a magnetoresistive linear displacement sensor.

Specifically selected, the pumping device is a concrete pumping device.

Through the above technical solution, the pumping stroke control method and the pumping device of the double-cylinder pump of the present invention can adaptively adjust the pumping stroke of the two-cylinder pump according to the working load pressure of the pumped fluid material, so that the material is made. The conveying cylinder (for example, the concrete conveying cylinder) effectively avoids the phenomenon of insufficient suction, thereby improving the pumping suction efficiency and saving energy. In particular, in a preferred form of the invention, the present invention preferably employs a workload pressure sensing device, a controller with a database, and a pumping stroke adjustment device that is automatically adjusted by the controller to achieve a pump for the dual cylinder pump Adaptive adjustment of the delivery stroke. Therefore, the present invention enables the two-cylinder pump to operate with a relatively ideal pumping stroke under different pumping conditions, thereby achieving an ideal suction efficiency. Further, the pumping apparatus of the present invention has a simple structure, is easy to operate, and can significantly extend the life of the delivery piston since the effective stroke of the delivery piston is effectively reduced.

Other features and advantages of the invention will be described in detail in the detailed description which follows. DRAWINGS

The following drawings are provided to provide a further understanding of the present invention, and are a part of the specification, which is used to explain the invention together with the specific embodiments described below, but the scope of the invention is not limited to the following drawings and embodiments. the way. In the drawing:

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional structural view showing a concrete pump disclosed in the prior art Chinese utility model patent CN201486790U.

Fig. 2 is a schematic view showing the hydraulic principle of a hydraulic dispensing pump disclosed in U.S. Patent No. 6,422,840 B2.

Fig. 3 is a schematic view showing the structure of a pumping apparatus according to an embodiment of the present invention, wherein a concrete pumping apparatus is taken as an example for display.

4 is a flow chart showing a method of controlling a pumping stroke of a two-cylinder pump according to a preferred embodiment of the present invention, wherein the pumping stroke control of the concrete pump is taken as an example. Description of the reference signs:

1 first main cylinder; second main cylinder;

3 first piston rod; 4 second piston rod;

5 communication cavity; 6 first piston rod displacement sensor;

7 second piston rod displacement sensor 8 pump stroke adjustment device;

9 controller; 10 total load pressure detecting device;

11 first concrete conveying cylinder; 12 second concrete conveying cylinder;

13 first concrete piston; 14 second concrete piston;

L actual pumping stroke. detailed description

The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. .

In order to make the description of the specific embodiments more specific and specific to facilitate the understanding by those skilled in the art, the pumping stroke control method and the pumping apparatus of the two-cylinder pump of the present invention are mainly described below by taking a concrete pump as an example. Accordingly, in the following description, the pumping stroke control method of the two-cylinder pump is specifically referred to as "the pumping stroke control method of the concrete pump", and the pumping device is specifically referred to as "concrete pumping equipment", but It will be apparent to those skilled in the art that since the main structure of the two-cylinder pump of the present invention is similar to that of a concrete pump, the following embodiments can be universally applied to the control of the pumping stroke of a fluid-material two-cylinder pump. Control of the pumping stroke of a two-cylinder pump such as mud or mortar

Before describing the specific embodiments of the present invention, in order to more fully understand the following technical solutions of the present invention, it is necessary to first explain:

First, it is known that the concrete pumped by the concrete pump is fluid concrete. Therefore, in the technical solution of the present application, "concrete" refers to fluid concrete that can be pumped by a concrete pump, and not concrete in a solidified state; In the process of pumping concrete by concrete pump, due to the different material parameters (such as viscosity, slump, water content, sediment concentration) of concrete in different operations, the concrete pumping cylinder of concrete pump often has insufficient suction. Phenomenon, the total load pressure of the concrete pump is also different, which will be described in appropriate in the following description of the principle;

Third, the structural form of the concrete pump itself is well known to those skilled in the art, and has been In the description of the technical solutions of the following text, the description of the known structures will be omitted, and the key technical idea of the present invention will be mainly described. For example, although the rodless chambers of the first main cylinder 1 and the second main cylinder 2 are shown to communicate with each other to constitute the communication chamber 5 in FIG. 3 of the present invention, the rod chambers of the first main cylinder 1 and the second main cylinder 2 are respectively The first working oil passage A and the second working oil passage B are connected to the oil inlet passage and the oil tank via the reversing valve, thereby forming a telescopic reversing control loop (only the first working oil passage A and FIG. 3 are schematically shown in FIG. 3). The second working oil passage B), but alternatively, it is also possible that the rod chambers of the first main cylinder 1 and the second main cylinder 2 communicate with each other to constitute the communication chamber 5, and the first main cylinder 1 and the second main unit The rodless chambers of the cylinder 2 are respectively connected to the first working oil passage A and the second working oil passage B, and these simple modifications are all within the scope of protection of the present invention. In addition, some other well-known components of the concrete pump, such as the distribution valve, the swing cylinder, the hopper, and the like provided at the delivery end of the concrete delivery cylinders 11, 12, are omitted in FIG. 3, but do not affect the understanding of the technical solutions of the present invention by those skilled in the art.

Hereinafter, a specific embodiment of the pumping stroke control method of the concrete pump of the present invention will be described first, and then a specific embodiment of the concrete pumping apparatus of the present invention will be described. In the description process, the operation process of the present invention will be described. Typical concrete devices and some possible simple variants.

The main technical idea of the pumping stroke control method of the concrete pump of the present invention is: According to the working load pressure of the concrete pump (which is directly related to the actual suction condition of the concrete pump), and determining the appropriate target pumping according to the working load pressure The stroke, in turn, adjusts the actual pumping stroke L of the concrete pump to the target pumping stroke by adjusting the amount (i.e., volume) of hydraulic oil within the communication chamber 5.

The above main technical concept relates to the working load pressure of the concrete pump and the technical principle, specific principle and analysis of the actual pumping stroke L of the concrete pump by adjusting the amount (i.e., volume) of the hydraulic oil in the communication chamber 5.

With regard to the working load pressure of the concrete pump, as shown in Fig. 3, as described above, during the operation of the concrete pump, the first concrete delivery cylinder 11 and the second concrete delivery cylinder 12 alternately push and suck In operation, when the first concrete delivery cylinder 11 pushes the material, the second concrete delivery cylinder 12 sucks, and vice versa. Accordingly, the workload pressure of the concrete pump can be subdivided into a total load pressure, a suction load pressure, and a pump load pressure, wherein the total load pressure is equal to the sum of the suction load pressure and the pump load pressure, and the suction load pressure and The pump load pressures are equal or substantially equal. It should be noted that due to the symmetry of the main structure of the concrete pump, if there is insufficient suction during the operation, basically there are suctions in the two concrete delivery cylinders. Insufficient phenomenon, the technical solution of the present invention can adopt the above total load pressure, suction load pressure or pump load pressure as a reference for determining the target pumping stroke, which does not affect the effectiveness of the technical solution of the present invention.

Specifically, in theory, if the first and second master cylinders 1, 2 and the first and second concrete pistons 13 are omitted, 14 The influence of the self-friction force, the total load pressure should be equal to the sum of the suction force of the concrete pump on the suction side for suctioning the concrete and the thrust formed on the discharge side for pushing the concrete (the first concrete delivery cylinder) 11 and the second concrete delivery cylinder 12 alternately serve as the suction side or the discharge side of the concrete pump). In the actual operation process, the pumping load pressure of the concrete pump also needs to consider the influence of the friction between each piston and the corresponding cylinder. Of course, the detection of the total load pressure, the suction load pressure or the pump load pressure is not difficult, since the pumping driving force of the concrete pump comes from the first working oil passage A and the second working oil passage B alternately entering the oil, the pump The suction driving force depends on or equal to the load pressure, so the total load pressure can be easily obtained by detecting the oil pressure by the oil pressure sensor, and the hydraulic oil in the communication chamber 5 is mainly used to drive the first main cylinder 1 or the second main cylinder 2 The first concrete piston 13 or the second concrete piston 14 is driven to push the material, so that the concrete pushing pressure can be easily obtained by the oil pressure sensor, and the concrete pushing load pressure is substantially equal to the suction load pressure, of course, more accurately, The total load pressure is subtracted from the concrete push load pressure to obtain the suction load pressure.

For example, in FIG. 3, when the first working oil passage A is oiled to drive the first concrete delivery cylinder 11 to suck and the second concrete delivery cylinder 12 is discharged, by detecting the rod cavity with the first main cylinder 1 ( The oil pressure on the first working oil passage A communicating as the driving chamber in FIG. 3, the oil pressure multiplied by the effective sectional area of the rod chamber of the first main cylinder 1 (the cross-sectional area of the rod chamber minus the first The total load pressure is obtained by the cross-sectional area of the rod portion of the piston rod 2, and by detecting the oil pressure in the communication chamber 5, the oil pressure in the communication chamber 5 is multiplied by the first main cylinder 1 or the second main cylinder 2 The pump load pressure can be obtained by the cross-sectional area of the rodless chamber. The concrete push load pressure is substantially equal to the suction load pressure. Of course, the suction load pressure can also be obtained by subtracting the concrete load load pressure from the total load pressure. In addition, if the rod chambers of the first main cylinder 1 and the second main cylinder 2 are connected to each other as the communication chamber 5 in FIG. 3, the rodless chambers of the first main cylinder 1 and the second main cylinder 2 are respectively A working oil passage A and a second working oil passage B communicate as a driving chamber. In this case, the conditions of detecting the total load pressure, the suction load pressure, and the pump load pressure are similar, but the oil pressure at the load pressure is calculated. The cross-sectional area to be multiplied needs to be changed accordingly.

Obviously, if there is a shortage of suction in the concrete pump due to different concrete material parameters to be conveyed during the operation of the concrete pump, and there are different degrees of insufficient suction for the concrete with different material parameters, The concrete pump is different in the different operation processes due to the different amount of pumped concrete. The resulting coagulation pump suction load pressure, pump material load pressure and suction load pressure are also different, that is, the coagulation pump suction load pressure, pump The material load pressure and the suction load pressure are directly related to the actual suction condition of the concrete pump or the actual working condition of the pump. For example, if the coagulation pump suction pressure, pump load pressure and suction load pressure are small, it represents the concrete pump. Insufficient suction is required. In order to avoid the invalid empty stroke of the main cylinder, the pumping stroke of the concrete pump can be appropriately adjusted. This can be used to establish a database or data table through a large number of simulation conditions, that is, the coagulation pump load pressure at each value, The pump load pressure and the suction load pressure correspond to different ideal target pumping strokes. If the actual pumping stroke of the concrete pump is equal to the target pumping stroke, the idle stroke can be effectively avoided and the pumping efficiency can be improved. Due to the fixed numerical relationship between the suction pump suction pressure, the pump load pressure and the suction load pressure, in order to simplify the establishment of the database, the coagulation pump can generally absorb the load pressure, the pump load pressure and the suction load. Any of the pressures serves as a reference corresponding to different target pumping strokes, and most preferably, the suction load pressure can be used as a reference.

In terms of the technical principle of adjusting the actual pumping stroke L of the concrete pump by adjusting the amount of hydraulic oil (ie, volume) in the communication chamber 5, as shown in FIG. 3, the hydraulic oil is theoretically incompressible, for various For a specific type of concrete, the advancement positions of the first concrete piston 13 and the second concrete piston 14 in the first concrete delivery cylinder 11 and the second concrete delivery cylinder 12 are fixed, for example, in the case shown in FIG. The first working oil passage A enters the oil, and the second working oil passage B returns to the oil, thereby pushing the first piston rod 3 of the first main cylinder 1 to move to the left, and the first piston rod 3 drives the first portion of the first concrete conveying cylinder 11 A concrete piston 13 moves to the left, and the first piston rod 3 moves to the left, thereby compressing the hydraulic oil in the rodless chamber (constituting a component of the communication chamber 5) of the first main cylinder 1, so that the first main cylinder The hydraulic oil in the rodless chamber of 1 flows into the rodless chamber of the second master cylinder 2, thereby pushing the second piston rod 4 of the second master cylinder 2 to the right, and the second piston rod 4 pushing the second concrete piston 14 Move to the right, in Figure 3 The second concrete piston 14 has moved the forward end position of the right end of the second concrete delivery cylinder 14 (to avoid hitting the cylinder, the corresponding limit stop on the concrete delivery cylinder generally has a predetermined interval from the right end of the concrete delivery cylinder), Although the first piston rod 3 is still moved to the left in the first main cylinder 1, correspondingly the first concrete piston 13 does not move into the left end suction end position of the first concrete cylinder 11 in the first concrete cylinder 11. However, since the second concrete piston 14 has moved into position, it cannot continue to move to the right again, due to the obstruction of the second concrete piston 14 and the incompressibility of the hydraulic oil in the communication chamber 5, regardless of whether the first working oil passage A continues With the oil entering, it is impossible to push the first piston rod 3 to continue to move to the left. In the case where the second concrete piston 14 shown in FIG. 3 has moved to the right in position, the reversing operation is performed such that the second working oil passage B is oiled, and the first working oil passage A is returned to the oil, and the second piston rod 4 is returned. It is also only possible to move the distance of the actual pumping stroke L from the position shown to the left, and the first concrete piston 13 is driven to the right end of the first concrete delivery cylinder 11 to advance the end position (well known, in order to ensure the pumping stroke) Matching and consistency, the first and second main cylinders 1, 2 of the concrete pump are the same hydraulic cylinder, and the first concrete delivery cylinder and the second concrete delivery cylinder 11, 12 are also the same delivery cylinder, and are on the main structure Symmetrical setting), that is to say, in this case, the actual pumping stroke of the concrete pump is L, it should be noted that the actual pumping stroke L of the concrete pump is equal to the first piston rod 3 of the first main cylinder 1 (or The telescopic movement stroke of the second piston rod 4) of the second master cylinder 2 and the telescopic movement stroke of the first concrete piston 13 of the first concrete delivery cylinder 11 (or the second concrete piston 14 of the second concrete delivery cylinder 12) 1 controls the first master cylinder The change in the telescopic movement stroke of the first piston rod 3 (or the second piston rod 4 of the second main cylinder 2) means a change in the actual pumping stroke L of the concrete pump.

In the state shown in FIG. 3 (to facilitate understanding of the static analysis here), if the hydraulic pressure oil of the predetermined volume V is increased into the communication chamber 5 by the pumping stroke adjusting device 8, the second of the second main cylinder 2 The piston rod 4 cannot increase the volume of the rodless chamber of the second main cylinder 2 because the second concrete piston 14 has moved into position, and the hydraulic oil of the predetermined volume V can only push the first main cylinder 1 to the right. A piston rod 3 increases the volume of the rodless chamber of the first main cylinder 1, and in the state of Fig. 3, the first piston rod 3 moves to the right, and the actual pumping stroke L is reduced (the reduced distance is The predetermined volume V of the increased hydraulic oil is divided by the cross-sectional area of the rodless chamber of the first hydraulic cylinder. Of course, in the case where the rod chamber constitutes the communication chamber 5, the predetermined volume V of the increased hydraulic oil should be divided by the piston. Correspondingly, if the hydraulic pressure oil of the first hydraulic cylinder is reduced by a predetermined amount V from the communication chamber by the pumping stroke adjusting device 8, the first piston rod 3 will be as shown in FIG. Position moved to the left, from L increases so that the actual pump stroke. Although the above analysis is only a static analysis for ease of understanding, the principle is the same whether dynamic or static, that is, during the pumping process of the concrete pump, the volume of hydraulic oil in the communication chamber 5 can be changed (due to the hydraulic oil The incompressibility, that is, changing the volume of the communication chamber 5, can control the size of the telescopic movement stroke of the piston rod of the main cylinder, and correspondingly change the actual pumping stroke L of the concrete pump, specifically, if it is in the communication chamber 5 When the total volume of the hydraulic oil is reduced, the telescopic movement stroke of the main cylinder (the first main cylinder 1 and the second main cylinder 2) becomes larger, and the actual pumping stroke L of the concrete pump is increased; if the hydraulic oil in the communication chamber 5 is connected When the total volume is increased, the telescopic movement stroke of the main cylinder becomes smaller, and the pumping stroke L of the concrete pump is reduced. Therefore, by controlling the amount of hydraulic oil in the communication chamber (i.e., the volume of the hydraulic oil), the control of the expansion and contraction movement of the main cylinder can be realized, thereby achieving stepless adjustment of the pumping stroke of the concrete pump. It is additionally noted herein that the stepless adjustment of the present invention means that the concrete pump can be adjusted to a plurality of pumping strokes or a substantially continuous pumping stroke.

Referring to FIG. 4, the pumping stroke control method of the concrete pump of the present invention comprises the following steps:

First, detecting and obtaining the working load pressure of the concrete pump during the working process of the concrete pump; second, determining the target pumping stroke corresponding to the working load pressure according to the working load pressure of the concrete pump (generally by comparing the simulated working conditions) The database or data table determined by the test is determined); third, the actual pumping stroke L of the concrete pump is adjusted to the target by adjusting the volume of the hydraulic oil contained in the communication chamber 5 of the concrete pump Pumping stroke.

It should be noted here that although the pumping stroke control method of the concrete pump of the present invention preferably adopts automatic control to form a pumping stroke control method of an adaptive concrete pump, the pumping stroke control of the concrete pump of the present invention is The method can also be implemented by manually adjusting the above steps, although it does not have automatic tuning. The advantages of the section, but it also falls within the scope of protection of the invention.

In the above-mentioned main technical concept of the pumping stroke control method of the concrete pump of the present invention, as described above, as described above, the working load pressure of the concrete pump may be a suction load pressure, a pump load Pressure or total load pressure. Of course, it is also possible to use two or three of the suction load pressure, the pump load pressure and the total load pressure as the basis for determining the target pumping stroke, but this will make the establishment of the database relatively complicated. The detection and calculation principles for the suction load pressure, the pump load pressure or the total load pressure have been described and will not be described here. Referring to FIG. 3, the present invention mainly uses a workload pressure detecting device for detecting. The working pressure detecting device is mainly an oil pressure sensor. When the total load pressure is used as a reference for determining a target pumping stroke, the working load pressure can be used. The detecting device 10 is respectively connected to the first working oil passage A communicating with the rod chamber of the first main cylinder 1 and the second working oil passage B communicating with the rod chamber of the second main cylinder 2, thereby working in the first work When the oil passage A and the second working oil passage B alternately enter the oil, the oil pressure for driving the hydraulic oil can be detected, and according to the oil pressure, the total load pressure can be calculated (preferably, the hydraulic pressure is sent to the controller 9). It should be noted that FIG. 3 only shows that the rodless chambers of the first main cylinder 1 and the second main cylinder 2 communicate with each other to form the communication chamber 5, and the concrete pump also has the first main cylinder 1 and the second main cylinder 2 The rod chambers are connected to each other to form a communication chamber 5. At this time, the first working oil passage A communicates with the rodless chamber of the first main cylinder, and the second working oil passage B communicates with the rodless chamber of the second main cylinder 2, but the detection The method is the same. Therefore, in general, when the total load pressure is used as a reference for determining the target pumping stroke, the workload pressure detecting device 10 can be connected to the first working oil passage A and the second working oil passage B of the concrete pump. , to detect the driving oil pressure of the concrete pump, and calculate the total load pressure by the driving oil pressure. When the pump load pressure is used as a reference for determining the target pumping stroke, the workload pressure detecting device 10 can communicate with the communication chamber 5 of the concrete pump, thereby detecting that the oil pressure in the communication chamber 5 is detected, and the oil is used The pressure calculation calculates the pump load pressure. When the suction load pressure is used as a reference for determining the target pumping stroke, the workload pressure detecting device 10 may include two oil pressure sensors, one of which is respectively associated with the first working oil passage A and the second working oil The road B is connected, and the other oil pressure sensor is connected to the communication chamber 5, so that the total load pressure and the pump load pressure can be respectively calculated, and the difference between the total load pressure and the pump load pressure is the suction load pressure. It should be noted here that the specific arrangement form of the workload pressure detecting device 10 is various to those skilled in the hydraulic field, and is not limited to the specific case shown in FIG. 3, for example, in FIG. The first working oil passage, the second working oil passage B, and the hydraulic oil in the communication chamber 5 are taken out through the oil passage, and then the hydraulic pressure sensor in the working load pressure detecting device 10 can be directly disposed to the communication chamber. 5 or the rod chamber of the first main cylinder 1 and the rod chamber of the second main cylinder 2 shown in FIG. 3, and the oil pressure sensor can be electrically connected to the controller 9 described below, thereby being controlled by the controller Calculate and determine the corresponding suction load pressure and pump load pressure according to the corresponding oil pressure Or the total load pressure, of course, the workload pressure detecting device 10 can also bring its own computing unit and display unit so that the required workload pressure can be determined and/or displayed.

In addition, in the foregoing second step, the target pumping stroke of the concrete pump corresponding to the working load pressure may be determined by the controller 9 according to any working pressure of the concrete pump, and the concrete pump may be determined by detecting Any of the above-mentioned workload pressures are input into the controller 9, and of course, the corresponding oil pressures that can be detected are directly transmitted to the controller 9, and the controller 9 calculates and determines the corresponding workload pressure. The controller 9 has a database therein. The target pumping stroke corresponding to the workload pressure of each value is stored in the database, and the controller 9 finds the target pumping stroke corresponding to the workload pressure by querying the database according to the workload pressure, thereby determining The target pumping stroke corresponding to the workload pressure. The controller 9 (which may also be a pump stroke adaptive control device) may be an electronic control unit, a programmable controller, a single chip microcomputer or the like. Of course, it is not limited to the form of automatic inquiry by the controller 9, and the target pumping stroke can also be determined by the operator according to the determined workload pressure table of the corresponding concrete pump. The target pumping stroke corresponding to the work load pressure of different values is generally the ideal or ideal pumping stroke of the concrete at the working load pressure. When the concrete pump adopts the target pumping stroke, the concrete pumping of the material condition is carried out. When the concrete delivery cylinder is not prone to insufficient suction, it has a relatively high pumping efficiency. The establishment of the database mainly through the simulation of the working condition test, summarizing the target pumping stroke of the concrete pump of various concrete pump workload pressures (such as suction load pressure, pump load pressure or total load pressure), thereby making the corresponding concrete The pump's working pressure has a corresponding target pumping stroke. For example, for a concrete pump of a certain type, the target pumping stroke corresponding to various working load pressures of the concrete pump is determined by a large number of simulated working conditions tests.

In the above third step, specifically, the current actual pumping stroke L of the concrete pump can be detected, which can be realized by a linear displacement sensor (for example, a reluctance linear displacement sensor), when the actual pumping stroke L is larger than the The target pumping stroke can be reduced to the target pumping stroke by increasing the volume of hydraulic oil within the communication chamber 5 during the target pumping stroke. When the actual pumping stroke L is smaller than the target pumping stroke, the actual pumping stroke L may be increased to the target pumping stroke by reducing the volume of hydraulic oil in the communication chamber 5. Specifically, the adjustment process may take a plurality of adjustment sequences. For example, the volume of the hydraulic oil in the communication chamber 5 may be continuously adjusted by the pump stroke adjustment device. Preferably, the metering pump may be continuously injected into or from the communication chamber 5. The communication chamber 5 draws out the hydraulic oil, and detects the actual pumping stroke L of the concrete pump in real time until the actual pumping stroke L is adjusted to the target pumping stroke to stop adjusting the volume of the hydraulic oil in the communication chamber 5. Of course, in the simplest case, the actual pumping stroke L of the concrete pump can be adjusted to the maximum pumping stroke before each operation of the concrete pump, so that the maximum pumping stroke is used as the actual pumping stroke L to the target pumping Adjustment of the itinerary, in this case The current actual pumping stroke of the concrete pump may not be detected before the knot.

Most preferably, since the communication chamber 5 is formed by the rodless chamber communication of the first main cylinder 1 and the second main cylinder 2, or is formed by the rod chamber communication of the first main cylinder 1 and the second main cylinder 2, The cross-sectional area of the communication chamber 5 is determined, so that it is most preferable to first calculate the volume of hydraulic oil that needs to be increased or decreased according to the target pumping stroke and the actual pumping stroke L, and then pass the metering pump to the communication chamber 5 The hydraulic oil is injected or extracted from the communication chamber 5 to adjust the volume of the hydraulic oil in the communication chamber 5. Specifically, it can be seen from the above principle analysis that the volume of the hydraulic oil injected or extracted in the communication chamber 5 is the absolute value of the difference between the actual pumping stroke L and the target pumping stroke multiplied by the cross-sectional area of the communication chamber 5, wherein When the communication chamber 5 is formed by the connection between the first main cylinder 1 of the concrete pump and the rodless chamber of the second main cylinder 2, the cross-sectional area of the communication chamber 5 is equal to the rodless chamber of the first main cylinder 1 or the second main cylinder 2 Cross-sectional area; when the communication chamber 5 is formed by the rod-cavity communication of the first main cylinder 1 and the second main cylinder 2, the cross-sectional area of the communication chamber 5 is equal to the rod cavity of the first main cylinder 1 or the second main cylinder 2 The cross-sectional area is subtracted from the cross-sectional area of the piston rod 3 or 4 of the first main cylinder 1 or the second main cylinder 2.

When the above-mentioned volume of hydraulic oil is increased or decreased as needed into the communication chamber 5 by the metering pump, it is ensured that the actual pumping stroke L of the concrete pump is adjusted to the target pumping stroke. Further preferably, in order to verify that the adjustment is accurate, it is further possible to further detect the actual pumping stroke of the concrete pump and determine whether the adjusted actual pumping stroke is equal to the target pumping stroke to determine if further adjustment is required.

As can be seen from the above description, the pumping stroke control method of the concrete pump of the present invention can set the target pumping of the optimum or better suction efficiency based on the workload pressure of the concrete pump in the controller in a preferred adaptive control mode. The trip database, that is, the workload pressure of each corresponding concrete pump will have a corresponding target pumping stroke; during the pumping of the concrete, the workload pressure of the concrete pump is detected and determined, and then the controller will be in the above database Querying the target pumping stroke, the controller controls the pumping stroke adjusting device according to the inquired target pumping stroke, and adjusts the telescopic control stroke of the master cylinder, for example, when the actual pumping stroke fed back by the displacement sensor is the target pumping stroke, The stroke adjustment ends. When pumping, the concrete pump will pump with this target pumping stroke, and the concrete delivery cylinder will achieve the desired suction efficiency. That is to say, the key technical points of the present invention are as follows: First, the working load pressure detecting device of the concrete pump is set, and the working load pressure of the concrete pump can be adaptively detected during the working process of the concrete pump; second, each set is set The database of the target pumping stroke under the working load pressure of the concrete pump can realize the ideal suction efficiency in the concrete conveying cylinder according to the target pumping stroke. Secondly, a pumping stroke adjusting device is provided, and the volume of the hydraulic oil in the communication chamber 5 can be adjusted by the pumping stroke adjusting device, so that the pumping stroke can be adjusted as needed, thereby achieving a stepless adjustment of the pumping stroke, in particular In the most preferred embodiment, an adaptive automatic adjustment of the pumping stroke of the concrete pump is achieved. A specific embodiment of the concrete pumping apparatus of the present invention capable of realizing the pumping stroke control method of the above concrete pump will be briefly described below. Referring to Figure 3, the concrete pumping apparatus of the present invention comprises a concrete pump, wherein the concrete pumping apparatus further comprises a controller 9, a pumping stroke for adjusting the volume of hydraulic oil in the communication chamber 5 of the concrete pump An adjusting device 8 and a working load pressure detecting device 10 for detecting a working load pressure of the concrete pump, the controller 9 being electrically connected to the working load pressure detecting device 10 and the pumping stroke adjusting device 8, The controller 9 determines a target pumping stroke of the concrete pump corresponding to the workload pressure according to the detected workload pressure, and further adjusts the communication chamber of the concrete pump by controlling the pumping stroke adjusting device 8 The volume of hydraulic oil contained therein adjusts the current actual pumping stroke L of the concrete pump to the target pumping stroke.

In the above technical solution of the concrete pumping apparatus, it is to be understood that, as described in the above control method, since the present invention can maximize the initial pumping stroke of the concrete pump before adjusting the pumping stroke of the concrete pump Pumping the stroke, and after determining the target pumping stroke, the volume of hydraulic oil that needs to be reduced from the communication chamber 5 can be calculated by the controller, and thus the displacement sensor (for example, the first piston rod displacement sensor 6 and the second piston rod displacement sensor) 7) It is not necessary for the concrete pumping equipment of the present invention to be included. Of course, if it is desired to achieve continuous adjustment during operation, it should preferably include a displacement sensor, as described below.

The workload pressure detecting device 10 may generally include an oil pressure sensor that communicates with the first working oil passage A and the second working oil passage B through hydraulic lines, respectively, and/or the work The load pressure detecting device 10 communicates with the communication chamber 5 through a hydraulic line. As described above, the hydraulic connection form of the workload pressure detecting device 10 when selecting the suction load pressure, the pump load pressure or the total load pressure in the work load pressure using the concrete pump as the reference for determining the target pumping stroke Can be different. For example, when the total load pressure is used as a reference for determining the target pumping stroke, the workload pressure detecting device 10 may be in communication with the first working oil passage A and the second working oil passage B of the concrete pump to detect concrete. The pump's drive oil pressure is calculated by the drive oil pressure to obtain the total load pressure. When the pump load pressure is used as a reference for determining the target pumping stroke, the workload pressure detecting device 10 can communicate with the communication chamber 5 of the concrete pump, thereby detecting that the oil pressure in the communication chamber 5 is detected, and the oil is used The pressure calculation calculates the pump load pressure. When the suction load pressure is used as a reference for determining the target pumping stroke, the workload pressure detecting device 10 may include two oil pressure sensors, one of which is respectively associated with the first working oil passage A and the second working oil The road B is connected, and the other oil pressure sensor is connected to the communication chamber 5, so that the total load pressure and the pump load pressure can be respectively calculated, and the difference between the total load pressure and the pump load pressure is the suction load pressure. The specific arrangement form of the workload pressure detecting device 10 is various to those skilled in the hydraulic field, and is not limited to the specific case shown in FIG. 3, for example, in FIG. In the middle, the first working oil passage A, the second working oil passage B, and the hydraulic oil in the communication chamber 5 are taken out by the oil passage, and the hydraulic pressure sensor in the working load pressure detecting device 10 can also be directly set. Going into the communication chamber 5 or the rod chamber of the first main cylinder 1 shown in FIG. 3 and the rod chamber of the second main cylinder 2, and the oil pressure sensor can be electrically connected to the controller 9 so that the controller Calculate and determine the corresponding suction load pressure, pump load pressure or total load pressure according to the corresponding oil pressure. Of course, the work load pressure detecting device 10 can also bring the corresponding calculation unit and display unit, so that it can be determined and/or displayed. The required workload pressure.

It should be noted here that in the present invention, the workload pressure detecting device 10 is only used for detecting the working load pressure of the concrete pump, that is, it is applied in the process of detecting and determining the working load pressure of the concrete pump, and the working load pressure is The detecting device 10 can be provided with a corresponding calculating unit and a display unit, thereby determining and/or displaying the required workload pressure according to the detected corresponding oil pressure calculation, or electrically connecting the oil pressure sensor without its own calculation unit. Go to the controller 9, so that the controller calculates and determines the corresponding suction load pressure, pump load pressure or total load pressure based on the corresponding oil pressure. Regardless of the form of the workload pressure detecting device 10, it is within the technical concept of the present invention as long as it participates in the detection to determine the workload pressure of the concrete pump.

In addition, the pumping stroke adjusting device may specifically include a pumping device and a driving device of the pumping device, wherein the controller 9 is electrically connected to the driving device, and the pumping device is connected to the concrete pump. The chamber 5 communicates to selectively draw or inject hydraulic oil into the communication chamber 5. Obviously, the pumping device may be a metering pump or other pumping device capable of pumping hydraulic oil (for example, a plunger pump with a scale, the driving device of the plunger pump may be, for example, an electric telescopic rod). The driving device may be an electric motor or a hydraulic motor driving assembly having an electromagnetic reversing valve, etc., and the driving device drives a pumping device such as a metering pump or a plunger pump to reversibly or telescopically realize pumping or pumping of hydraulic oil. For example, in the case of a metering pump, pumping or pumping can be achieved by controlling the motor to drive the metering pump forward and reverse, and the two ports of the metering pump can be respectively connected to the communication chamber 5 and the fuel tank, of course, the pumping The device can also use two metering pumps, one metering pump for pumping hydraulic oil from the communication chamber and the other metering pump for pumping oil into the communication chamber 5 (the two ports of each metering pump can be connected separately) Connecting chamber 5 and fuel tank), such a pumping stroke adjusting device 8 for adjusting the volume of hydraulic oil in the communication chamber 5 of the concrete pump is for a person skilled in the hydraulic field , In light of the technical concept of the present invention can be designed a variety of type type, not described herein again. Such a pumping stroke adjusting device can have various forms, and in the case of a pumping device and a driving device of the pumping device, the relevant pumping device and driving device can be variously made by those skilled in the art. Variants will not be described here.

Preferably, the concrete pumping apparatus of the present invention further includes a displacement sensor for detecting the actual pumping stroke L of the concrete pump, which can detect the current actual pumping stroke L before adjusting the pumping stroke of the concrete pump, thereby It is not necessary to adjust the concrete pump to the maximum pumping stroke before each operation, and the adaptive adjustment of the pumping stroke can be conveniently achieved in successive different operations. The displacement sensor generally only needs to be mounted on the first main cylinder 1 or the second main cylinder 2, and the first piston rod 3 of the first main cylinder 1 and the second piston rod of the second main cylinder 2 in FIG. 4 is mounted with a first piston rod displacement sensor 6 and a second piston rod displacement sensor 7 at the same time, the first piston rod displacement sensor 6 and the second piston rod displacement sensor 7 are both reluctance type linear displacement sensors, which are in the hydraulic cylinder It is commonly used in stroke detection, and its mounting form is well known to those skilled in the art and is typically mounted such that the piston rod can slide relative to the rod probe of the reluctance linear displacement sensor. Of course, the displacement sensor can also employ other well-known sensors, such as Hall sensors. Obviously, the earth pump pumping device can be, for example, a concrete pump truck equipped with a concrete pump, a concrete pump, or the like.

As can be seen from the above description, the present invention has the following advantages: The present invention provides a pumping stroke control method for a concrete pump and a concrete pumping device which can be based on the working load pressure of the concrete (insufficient in suction with the concrete pumping) The working condition is directly related), to adjust the pumping stroke of the concrete pump adaptively, so that the concrete conveying cylinder effectively avoids the phenomenon of insufficient suction, thereby improving the pumping suction efficiency and saving energy. The invention realizes stepless adjustment of the pumping stroke of the concrete pump, in particular in the preferred form, the invention preferably employs a working load pressure detecting device 10, a controller 9 having a database and a pumping stroke adjusting device 8, by means of control The device 9 realizes automatic adjustment, thereby achieving adaptive adjustment of the pumping stroke of the concrete pump. Therefore, the present invention allows the concrete pump to operate at a relatively ideal pumping stroke under different concrete pumping conditions, thereby achieving an ideal suction efficiency. The concrete pumping device of the present invention is simple in structure, convenient in operation, low in cost, and can effectively extend the life of the concrete piston by effectively reducing the ineffective stroke of the concrete piston.

The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments, and various simple modifications of the technical solutions of the present invention may be made within the scope of the technical idea of the present invention. These simple variations are within the scope of the invention. In particular, although the pumping stroke control method of the two-cylinder pump of the present invention and the pumping apparatus for realizing the same are mainly described above by taking a concrete pump as an example, the pumping stroke control method of the two-cylinder pump of the present invention is also used for The pumping device implementing the method is obviously not limited to the pumping stroke control method of the concrete pump and the concrete pumping device, but can be universally applied to the control of the pumping stroke of the two-cylinder pump for conveying other fluid materials. For example, the control of the pumping stroke of a two-cylinder pump such as mud or mortar, in particular the formation of a pumping device for conveying other viscous materials.

It should be further noted that the specific technical features described in the above specific embodiments may be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not be further described in various possible combinations. In addition, any combination of various embodiments of the invention may be made, as long as it does not deviate from the idea of the invention, and should also be regarded as the disclosure of the invention.

Claims

Rights request

1. The pumping stroke control method of the double-cylinder pump includes the following steps:

First, detect and obtain the working load pressure of the double-cylinder pump during its operation; second, determine the target pumping stroke corresponding to the working load pressure according to the working load pressure of the double-cylinder pump; third, By adjusting the volume of hydraulic oil contained in the connecting chamber (5) of the double-cylinder pump, the actual pumping stroke (L) of the double-cylinder pump is adjusted to the target pumping stroke.

2. The pumping stroke control method of a double-cylinder pump according to claim 1, wherein in the first step, the working load pressure of the double-cylinder pump is the suction material load pressure, the pump material load pressure or the total pressure. load pressure.

3. The pumping stroke control method of a dual-cylinder pump according to claim 2, wherein in the first step, the working load pressure of the dual-cylinder pump is the total load pressure, and by detecting the dual-cylinder pump The driving oil pressure on the first working oil circuit (A) or the second working oil circuit (B) is used to determine the total load pressure.

4. The pumping stroke control method of a double-cylinder pump according to claim 2, wherein in the first step, the working load pressure of the double-cylinder pump is the pump material load pressure, and by detecting the connecting chamber (5) to determine the pump material load pressure.

5. The pumping stroke control method of a double-cylinder pump according to claim 2, wherein in the first step, the working load pressure of the double-cylinder pump is the suction load pressure, and by detecting the double-cylinder pump The driving oil pressure on the first working oil line (A) or the second working oil line (B) of the pump is determined to determine the total load pressure, and the oil pressure in the communicating chamber (5) is determined to determine the Pump material load pressure, and then determine the suction material load pressure by calculating the difference between the total load pressure and the pump material load pressure.

6. The pumping stroke control method of a double-cylinder pump according to claim 1, wherein in the second step, the target pumping is determined by querying a database or a data table according to the detected workload pressure. journey.

7. The pumping stroke control method of a double-cylinder pump according to claim 1, wherein in the third step, the actual pumping stroke (L) of the double-cylinder pump at the initial stage of operation is adjusted to be at maximum pumping stroke, by reducing The volume of hydraulic oil in the communication chamber (5) causes the actual pumping stroke (L) to increase to the target pumping stroke.

8. The method for controlling the pumping stroke of a double-cylinder pump according to claim 1, wherein in the third step, the actual pumping stroke α) of the double-cylinder pump is detected, and when the actual pumping stroke When the stroke α) is greater than the target pumping stroke, the actual pumping stroke (L) is reduced to the target pumping stroke by increasing the volume of hydraulic oil in the communicating chamber (5); When the actual pumping stroke (L) is less than the target pumping stroke, the actual pumping stroke (L) is increased to the target by reducing the volume of hydraulic oil in the communication chamber (5). Pumping Stroke.

9. The pumping stroke control method of a double-cylinder pump according to claim 8, wherein in the third step, the volume of hydraulic oil in the communication chamber (5) is continuously adjusted and detected in real time. The actual pumping stroke (L) of the double-cylinder pump, until the actual pumping stroke (L) is adjusted to the target pumping stroke, the adjustment of the connecting chamber is stopped.

(5) The volume of hydraulic oil within.

10. The pumping stroke control method of a double-cylinder pump according to claim 8, wherein in the third step, the volume of hydraulic oil increased or decreased in the communication chamber (5) is the actual pump The absolute value of the difference between the delivery stroke (L) and the target pumping stroke is multiplied by the cross-sectional area of the communication cavity (5), where

When the connecting chamber (5) is formed by connecting the rodless chambers of the first main cylinder (1) and the second main cylinder (2) of the double-cylinder pump, the cross-sectional area of the connecting chamber (5) is equal to the The cross-sectional area of the rodless cavity of the first master cylinder (1) or the second master cylinder (2); when the connecting cavity (5) consists of the first master cylinder (1) and the second master cylinder (2) When the rod cavity is connected and formed, the cross-sectional area of the connecting cavity (5) is equal to the cross-sectional area of the rod cavity of the first master cylinder (1) or the second master cylinder (2) minus the first master cylinder. (1) or the cross-sectional area of the piston rod of the second master cylinder (2).

11. The pumping stroke control method of a double-cylinder pump according to claim 10, wherein the pumping stroke control method of a double-cylinder pump further includes a fourth step. In the fourth step, detecting the double-cylinder pump The actual pumping stroke after adjustment of the pump is determined to determine that the adjusted actual pumping stroke is equal to the target pumping stroke.

12. The pumping stroke control method of a double-cylinder pump according to any one of claims 1 to 11, wherein in the first step, the double-cylinder pump is detected and obtained by a workload pressure detection device (10). Cylinder pump workload Pressure; In the second step, the controller (9) is used to determine the target pumping corresponding to the workload pressure by querying the database in the controller (9) based on the detected workload pressure. Stroke; In the third step, the controller (9) controls the pumping stroke adjustment device (8) to adjust the hydraulic pressure in the communicating chamber (5) through the pumping stroke adjustment device (8). Volume of oil.

13. Pumping equipment, including a double-cylinder pump, wherein the pumping equipment also includes a controller (9) and a pumping stroke adjustment device for adjusting the volume of hydraulic oil in the connecting chamber (5) of the double-cylinder pump. (8), and a working load pressure detection device (10) for detecting the working load pressure of the double-cylinder pump,

The controller (9) is electrically connected to the workload pressure detection device (10) and the pumping stroke adjustment device (8), and the controller (9) determines the workload based on the detected workload pressure. The target pumping stroke of the double-cylinder pump corresponding to the load pressure, and further adjusts the volume of hydraulic oil contained in the connecting chamber (5) of the double-cylinder pump by controlling the pumping stroke adjustment device (8), thereby adjusting the The current actual pumping stroke (L) of the double-cylinder pump is adjusted to the target pumping stroke.

14. The pumping equipment according to claim 13, wherein the workload pressure detection device (10) includes an oil pressure sensor, and the workload pressure detection device (10) is connected to the first workload through a hydraulic pipeline. The oil circuit (A) is connected to the second working oil circuit (B), and/or the working load pressure detection device (10) is connected to the communication chamber (5) through a hydraulic pipeline.

15. The pumping equipment according to claim 13, wherein the pumping stroke adjustment device (8) includes a pumping device and a driving device of the pumping device, and the controller (9) is electrically connected to the Driving device, the pumping device is connected with the communication chamber (5) of the double-cylinder pump to selectively suck or inject hydraulic oil into the communication chamber (5).

16. The pumping equipment according to claim 15, wherein the pumping device is a metering pump, and the driving device is a motor.

17. The pumping equipment according to claim 13, wherein the pumping equipment further comprises a displacement sensor for detecting the actual pumping stroke (U) of the double-cylinder pump.

18. The pumping equipment according to claim 17, wherein the displacement sensor is a magnetoresistive linear displacement sensor.

19. The pumping equipment according to any one of claims 13 to 18, wherein the pumping equipment is concrete pumping equipment.