Control method of turning plate unloading platform

Abstract

The invention discloses a control method of a flap unloading platform, which is applied to a hydraulic control system of the flap unloading platform, and comprises the following steps: acquiring a starting signal, and enabling a power driving branch based on the starting signal; the system pressure of a hydraulic control system of the turning plate unloading platform is controlled by the power driving branch to be gradually increased; in response to the fact that the system pressure is equal to the preset value, the power-on state of the main electromagnetic valve is changed, the first proportional throttle valve and the second proportional throttle valve are adjusted based on the second working state of the main electromagnetic valve, the first lifting oil cylinder and the second lifting oil cylinder are controlled to act, and the turning plate unloading platform is driven to rotate; and in response to rotation of the flap unloading platform to the preset angle, the power-on state of the main electromagnetic valve is changed, so that the flap unloading platform is controlled to stop rotating based on the first working state of the main electromagnetic valve. By controlling the first proportional throttle valve and the second proportional throttle valve which are independent, independent control over the first lifting oil cylinder and the second lifting oil cylinder is achieved so that synchronous action can be achieved.

Description

Technical Field

[0001] The present application relates to the technical field of transport and unloading, and in particular to a control method for a flap unloading platform. Background Art

[0002] With the development of the truck transportation industry, a large number of bulk materials rely on heavy-duty trucks for transportation. After the heavy-duty trucks carry the bulk materials to the destination, unloading is generally done manually, which not only requires a lot of manpower and increases the labor cost, but also the workers have high labor intensity, poor working conditions, slow speed and low efficiency when unloading, which often causes the heavy-duty trucks loaded with materials to queue up for unloading. Therefore, hydraulic flaps with the advantages of high unloading efficiency and strong safety are widely used as truck fast unloading equipment in large-scale operations such as grain, coal, feed, wood chips, and construction.

[0003] Among them, the existing hydraulic flap machine lifting main oil cylinder synchronization is controlled by the throttle valve, the throttle valve control error will be large, the throttle valve will also be unstable due to changes in temperature and pressure, the synchronization effect is not good, it will often cause the mechanical structure to jam, and it needs to be adjusted many times, thus reducing the work efficiency. The oil cylinder synchronization adopts a synchronization valve, and the synchronization accuracy of the synchronization valve is only up to 3%, which cannot meet the higher precision requirements and is prone to dangerous conditions under eccentric load conditions. Summary of the invention

[0004] The purpose of this application is to provide a control method for a flap unloading platform to solve the above-mentioned technical problems existing in the prior art and improve the synchronization accuracy between different cylinders.

[0005] The present application provides a control method for a flap unloading platform, which is applied to a hydraulic control system of the flap unloading platform. The hydraulic control system of the flap unloading platform includes a first lifting cylinder control branch, a second lifting cylinder control branch, a power drive branch, and a main electromagnetic reversing valve. The first lifting cylinder control branch includes a first lifting cylinder and a first proportional throttle valve, and the second lifting cylinder control branch includes a second lifting cylinder and a second proportional throttle valve. The control method of the flap unloading platform includes:

[0006] Obtaining a start signal, and enabling a power drive branch based on the start signal;

[0007] The system pressure of the hydraulic control system controlling the flap unloading platform by the power drive branch is gradually increased;

[0008] In response to the system pressure being equal to the preset value, the power-on state of the main solenoid valve is changed, the main solenoid valve is controlled to switch from the first working state to the second working state, the first proportional throttle valve and the second proportional throttle valve are adjusted based on the second working state of the main solenoid valve, the first lifting cylinder and the second lifting cylinder are controlled to move, and the flap unloading platform is driven to rotate;

[0009] In response to the flap unloading platform rotating to a preset angle, the power-on state of the main solenoid valve is changed, the main solenoid valve is controlled to switch from the second working state to the first working state, and the flap unloading platform is controlled to stop rotating based on the first working state of the main solenoid valve;

[0010] The action values ​​of the first lifting cylinder and the second lifting cylinder are adjusted based on the feedback signal of the inclination sensor.

[0011] Furthermore, the control method of the flap unloading platform also includes:

[0012] The tilt angle of the flap unloading platform is obtained by using the tilt sensor;

[0013] In response to the roll angle being greater than a first preset value or less than a second preset value, the first proportional throttle valve or the second proportional throttle valve is adjusted to keep the roll angle between the second preset value and the first preset value.

[0014] Further, in response to the system pressure being equal to a preset value, the power-on state of the main solenoid valve is changed, the main solenoid valve is controlled to switch from the first working state to the second working state, the first proportional throttle valve and the second proportional throttle valve are adjusted based on the second working state of the main solenoid valve, and the first lifting cylinder and the second lifting cylinder are controlled to move, so as to drive the flap unloading platform to rotate, including:

[0015] In response to the system pressure increasing to a preset value, the first coil of the control main solenoid valve is energized;

[0016] The driving fluid is delivered to the first lifting cylinder and the second lifting cylinder based on the main solenoid valve to control the first lifting cylinder and the second lifting cylinder to rise.

[0017] Furthermore, the hydraulic control system of the flap unloading platform further includes a proportional speed regulating valve, and the step of using the power drive branch to control the system pressure of the hydraulic control system of the flap unloading platform to gradually increase includes:

[0018] In response to the enabling of the power drive branch, the opening of the proportional speed regulating valve is controlled to gradually decrease so that the system pressure of the hydraulic control system of the flap unloading platform is gradually increased.

[0019] Further, in response to the flap unloading platform rotating to a preset angle, the power-on state of the main solenoid valve is changed, the main solenoid valve is controlled to switch from the second working state to the first working state, and the step of controlling the flap unloading platform to stop rotating based on the first working state of the main solenoid valve includes:

[0020] In response to the flap unloading platform rotating to a preset angle, the first coil of the main solenoid valve is controlled to be de-energized to control the first lifting cylinder and the second lifting cylinder to stop moving; wherein the preset angle is the angle between the flap unloading platform and the horizontal plane, and the preset angle is greater than zero and less than ninety degrees;

[0021] The opening of the proportional speed regulating valve is controlled to gradually increase so that the system pressure of the hydraulic control system of the flap unloading platform is gradually reduced, and the power drive branch is controlled to be disabled.

[0022] Furthermore, the hydraulic control system of the flap unloading platform further includes a first wheel chock control branch and a second wheel chock control branch, and the control method of the flap unloading platform also includes:

[0023] In response to the gradual increase in system pressure of the hydraulic control system of the flap unloading platform, the first coil of the first electromagnetic reversing valve of the first wheel stopper control branch is energized, and the first coil of the second electromagnetic reversing valve of the second wheel stopper control branch is energized, so as to control the first wheel stopper cylinder of the first wheel stopper control branch and the second wheel stopper cylinder of the second wheel stopper control branch to rise;

[0024] In response to the first wheel choke oil cylinder and the second wheel choke oil cylinder moving to the preset position, the first coil of the first electromagnetic reversing valve is controlled to be de-energized, and the first coil of the second electromagnetic reversing valve is controlled to be de-energized.

[0025] Furthermore, in response to the system pressure being equal to a preset value, the power-on state of the main solenoid valve is changed, the main solenoid valve is controlled to switch from a first working state to a second working state, the first proportional throttle valve and the second proportional throttle valve are adjusted based on the second working state of the main solenoid valve, the first lifting cylinder and the second lifting cylinder are controlled to move, and the steps of driving the flap unloading platform to rotate include:

[0026] In response to the system pressure increasing to a preset value, the second coil of the main solenoid valve is energized to make the first externally controlled balancing valve of the first lifting cylinder control branch and the second externally controlled balancing valve of the second lifting cylinder control branch pressurized and connected;

[0027] The first lifting cylinder is controlled to output driving fluid through the first externally controlled balancing valve and the second lifting cylinder is controlled to output driving fluid through the second externally controlled balancing valve to control the first lifting cylinder and the second lifting cylinder to descend.

[0028] Furthermore, the hydraulic control system of the flap unloading platform further includes a proportional speed regulating valve, and the step of using the power drive branch to control the system pressure of the hydraulic control system of the flap unloading platform to gradually increase includes:

[0029] In response to the enabling of the power drive branch, the opening of the proportional speed regulating valve is controlled to gradually decrease so that the system pressure of the hydraulic control system of the flap unloading platform is gradually increased.

[0030] Further, in response to the flap unloading platform rotating to a preset angle, the power-on state of the main solenoid valve is changed, the main solenoid valve is controlled to switch from the second working state to the first working state, and the step of controlling the flap unloading platform to stop rotating based on the first working state of the main solenoid valve includes:

[0031] In response to the flap unloading platform rotating to an angle of zero with the horizontal plane, the second coil of the main solenoid valve is de-energized to control the first lifting cylinder and the second lifting cylinder to stop moving;

[0032] The opening of the proportional speed regulating valve is controlled to gradually increase so that the system pressure of the hydraulic control system of the flap unloading platform is gradually reduced, and the power drive branch is controlled to be disabled.

[0033] Furthermore, the hydraulic control system of the flap unloading platform further includes a first wheel chock control branch and a second wheel chock control branch, and the control method of the flap unloading platform also includes:

[0034] In response to the flap unloading platform rotating to an angle of zero with the horizontal plane, the second coil of the first electromagnetic reversing valve of the first wheel stopper control branch is energized, and the second coil of the second electromagnetic reversing valve of the second wheel stopper control branch is energized, so as to control the first wheel stopper cylinder of the first wheel stopper control branch and the second wheel stopper cylinder of the second wheel stopper control branch to descend;

[0035] In response to the first wheel chock cylinder and the second wheel chock cylinder being retracted to the initial position, the second coil controlling the first electromagnetic reversing valve is de-energized, and the second coil controlling the second electromagnetic reversing valve is de-energized.

[0036] Different from the prior art, the control method of the flap unloading platform of the present application is applied to the hydraulic control system of the flap unloading platform, and the hydraulic control system of the flap unloading platform includes a first lifting cylinder control branch, a second lifting cylinder control branch, a power drive branch, a main electromagnetic reversing valve and an inclination sensor, the first lifting cylinder control branch includes a first lifting cylinder and a first proportional throttle valve, and the second lifting cylinder control branch includes a second lifting cylinder and a second proportional throttle valve, wherein the power-on state of the main electromagnetic valve is changed to realize the control of the first proportional throttle valve and the second proportional throttle valve, thereby realizing the lifting and lowering control of the first lifting cylinder and the second lifting cylinder. At the same time, since the first proportional throttle valve and the second proportional throttle valve independently control the liquid flow rate of the first lifting cylinder control branch and the second lifting cylinder control branch, the present application can independently control the first lifting cylinder and the second lifting cylinder based on the feedback signal obtained by the inclination sensor, ensure the synchronous action of the first lifting cylinder and the second lifting cylinder, and improve the synchronization accuracy between the first lifting cylinder and the second lifting cylinder.

[0037] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 This is a flow chart of the first embodiment of the control method of the flap unloading platform of the present application;

[0040] Figure 2 yes Figure 1 A first specific flow chart of step S13;

[0041] Figure 3 yes Figure 1 A first specific flow chart of step S14;

[0042] Figure 4 This is a flow chart of a second embodiment of a control method for a flap unloading platform of the present application;

[0043] Figure 5 yes Figure 1 A second specific flow chart of step S13;

[0044] Figure 6 yes Figure 1 A second specific flow chart of step S14;

[0045] Figure 7 This is a flow chart of a third embodiment of a control method for a flap unloading platform of the present application;

[0046] Figure 8 It is a structural schematic diagram of an embodiment of a hydraulic control system of the flap unloading platform of the present application. DETAILED DESCRIPTION

[0047] In order to enable those skilled in the art to better understand the technical solution of the present application, the control method of the flap unloading platform provided by the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It can be understood that the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0048] The terms "first", "second", etc. in this application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0049] Since the synchronization of the lifting main cylinder of the existing hydraulic flap machine is controlled by the throttle valve, the error of the throttle valve control will be very large, and the throttle valve will also be unstable due to changes in temperature and pressure. In addition, the accuracy of the synchronization valve used for cylinder synchronization is up to 3%, which cannot meet higher precision requirements. Therefore, the present application provides a control method for a flap unloading platform, which realizes independent control of the two lifting cylinders by respectively setting proportional throttle valves in the two lifting cylinder control branches, and uses the feedback signal obtained by the inclination sensor to adjust the two lifting cylinders accordingly, effectively improving the synchronization accuracy between the two lifting cylinders. Please refer to Figure 1 , Figure 1 It is a flowchart of an embodiment of the dynamic image processing method of the present application.

[0050] The control method of the flap unloading platform of the present application may be implemented by a flap unloading platform. In some possible implementations, the control method of the flap unloading platform may also be implemented by a processor calling computer-readable instructions stored in a memory.

[0051] Specifically, the flap unloading platform of this embodiment is as follows: Figure 8As shown, the hydraulic control system of the flap unloading platform of this embodiment includes an oil tank 80, a first lifting cylinder control branch, a second lifting cylinder control branch, a first wheel stopper control branch, a second wheel stopper control branch, a power drive branch, a return branch, a throttling speed regulating branch, a main electromagnetic reversing valve 101, a processor (not shown) and an inclination sensor (not shown). Among them, the first lifting cylinder control branch connects the main electromagnetic reversing valve 101 and the throttling speed regulating branch, the throttling speed regulating branch connects the main electromagnetic reversing valve 101, the first wheel stopper control branch and the second wheel stopper control branch, the main electromagnetic reversing valve 101 is further connected to the power drive branch and the return branch, and the power drive branch and the return branch are further connected to the oil tank 80.

[0052] The first lifting cylinder control branch of the present embodiment includes a first lifting cylinder 11, a first externally controlled balancing valve 12, a first hydraulic bridge circuit 14 and a first proportional throttle valve 13; the second lifting cylinder control branch includes a second lifting cylinder 21, a second externally controlled balancing valve 22, a second hydraulic bridge circuit 24 and a second proportional throttle valve 23; the first wheel stopper control branch includes a first wheel stopper cylinder 31, a first one-way throttle valve 32, a first pressure reducing valve 33 and a first electromagnetic reversing valve 34; the second wheel stopper control branch includes a second wheel stopper cylinder 41, a second one-way throttle valve 42, a second pressure reducing valve 43 and a second electromagnetic reversing valve 44; the power drive branch includes a motor 51, a quantitative hydraulic pump 52, a high-pressure filter 53, an electromagnetic overflow valve 54 and a one-way valve 55, the return branch includes a radiator 61 and an oil return filter 62, and the throttling speed control branch includes a pressure gauge 71, a proportional speed control valve 72 and a manual down-regulation valve 73. The inclination sensor is connected to the processor, and the processor is further connected to the proportional speed control valve 72 .

[0053] Specifically, the control method of the flap unloading platform of the embodiment of the present disclosure may include the following steps:

[0054] Step S11: Obtain a start signal, and enable the power drive branch based on the start signal.

[0055] The start signal of this embodiment can be a user's power-on signal, which enables the power drive branch based on the start signal, starts the power drive branch to work, and specifically energizes the electromagnetic overflow valve 54. Specifically, the motor 51 starts to drive the quantitative hydraulic pump 52 to work, and the maximum pressure setting and unloading control of the hydraulic control system 1 of the flap unloading platform are realized by the electromagnetic overflow valve 54.

[0056] Step S12: Using the power drive branch to control the hydraulic control system of the flap unloading platform to gradually increase the system pressure.

[0057] In this embodiment, in response to the power drive branch being enabled, the opening of the proportional speed regulating valve 72 is controlled to gradually decrease, so that the system pressure of the hydraulic control system of the flap unloading platform is gradually increased. Specifically, the processor 102 controls the opening of the proportional speed regulating valve 72 to gradually decrease from large to increase the pressure of the hydraulic control system 1 of the flap unloading platform.

[0058] Step S13: In response to the system pressure being equal to the preset value, the power-on state of the main solenoid valve is changed, and the main solenoid valve is controlled to switch from the first working state to the second working state. Based on the second working state of the main solenoid valve, the first proportional throttle valve and the second proportional throttle valve are adjusted to control the first lifting cylinder and the second lifting cylinder to move, thereby driving the flap unloading platform to rotate.

[0059] Among them, the main solenoid valve 101 of this embodiment is specifically a three-position four-way solenoid reversing valve, wherein the first working state and the second working state can be the first coil a of the three-position four-way solenoid reversing valve being powered off and on, or the second coil b of the three-position four-way solenoid reversing valve being powered off and on.

[0060] Based on the different changes in the working state of the main solenoid valve 101, it is possible to control the first lifting cylinder and the second lifting cylinder to rise or fall, thereby driving the flap unloading platform to rotate and lift, or rotate and fall.

[0061] Step S14: In response to the flap unloading platform rotating to a preset angle, the power-on state of the main solenoid valve is changed, and the main solenoid valve is controlled to switch from the second working state to the first working state, and the flap unloading platform is controlled to stop rotating based on the first working state of the main solenoid valve.

[0062] Among them, the preset angle of this embodiment can be the angle between the flap unloading platform and the horizontal plane. When controlling the flap unloading platform to rotate and lift, the preset angle can be an angle greater than zero degrees and less than ninety degrees; when controlling the flap unloading platform to rotate and descend, the preset angle can be zero degrees.

[0063] Specifically, the action values ​​of the first lifting cylinder 11 and the second lifting cylinder 12 of the present embodiment are adjusted based on the feedback signal of the inclination sensor, and the specific adjustment steps may be as follows: using the inclination sensor to obtain the roll angle of the flap unloading platform; in response to the roll angle being greater than a first preset value or less than a second preset value, adjusting the first proportional throttle valve 13 or the second proportional throttle valve 23 to keep the roll angle between the second preset value and the first preset value, wherein the second preset value may be negative two degrees, and the first preset value may be positive two degrees.

[0064] Optionally, in one embodiment, the control method of the flap unloading platform can be used to control the rise of the flap unloading platform. Figure 2 , Figure 2 yes Figure 1The first specific flow chart of step S13 in FIG. Specifically, the following steps are included:

[0065] Step S131: In response to the system pressure increasing to a preset value, the first coil of the main solenoid valve is controlled to be energized.

[0066] When the system pressure of the hydraulic control system of the flap unloading platform of the present embodiment increases to a preset value, the first coil a of the main solenoid valve 101 is controlled to be energized.

[0067] Step S132: delivering driving fluid to the first lifting cylinder and the second lifting cylinder based on the main solenoid valve to control the first lifting cylinder and the second lifting cylinder to rise.

[0068] Among them, when the first coil a of the main solenoid valve 101 is energized, the oil tank 80 can deliver driving fluid, that is, deliver oil, to the first lifting cylinder control branch through the main solenoid valve 101, specifically to the first lifting cylinder 11 and the second lifting cylinder 21, thereby controlling the rise of the first lifting cylinder 11 and the second lifting cylinder 21.

[0069] Specifically, the first coil a of the main electromagnetic reversing valve 101 is energized, the flap unloading platform rises and flips, and the processor 102 receives the feedback signal obtained by the tilt sensor 103, and controls and adjusts the first proportional throttle valve 13 and the second proportional throttle valve 23 in real time to ensure that the flow rates entering the first lifting cylinder 11 and the second lifting cylinder 21 are equal, thereby synchronizing the movements of the first lifting cylinder 11 and the second lifting cylinder 21, and controlling the roll angle of the flap unloading platform to remain at ±0.2°.

[0070] Please continue reading Figure 3 , Figure 3 yes Figure 1 The first specific flow chart of step S14 in FIG. Specifically, the following steps are included:

[0071] Step S141: In response to the flap unloading platform rotating to a preset angle, the first coil of the main solenoid valve is controlled to be de-energized to control the first lifting cylinder and the second lifting cylinder to stop moving.

[0072] The present embodiment is used to control the rotation and lifting of the flap unloading platform, and the preset angle of the present embodiment is greater than zero and less than ninety degrees. When the flip angle of the flap unloading platform reaches the preset angle value X, such as 45 degrees or 60 degrees, the first coil a of the main electromagnetic reversing valve 101 is de-energized, and the flap unloading platform stops moving.

[0073] Step S142: Control the opening of the proportional speed regulating valve to gradually increase so that the system pressure of the hydraulic control system of the flap unloading platform gradually decreases, and control the power drive branch to be disabled.

[0074] The processor 102 controls the proportional speed regulating valve 72 so that its opening gradually increases from a small opening, the hydraulic control system of the flap unloading platform is depressurized, and the electromagnetic overflow valve 54 is powered off.

[0075] Optionally, in this embodiment, the control method of the flap unloading platform may further include the following steps to achieve the control of the wheel stopper of the flap unloading platform to rise. Figure 4 , Figure 4 This is a flow chart of the second embodiment of the control method of the flap unloading platform of the present application. Specifically, it includes the following steps:

[0076] Step S21: In response to the gradual increase in system pressure of the hydraulic control system of the flap unloading platform, the first coil of the first solenoid reversing valve controlling the first wheel stopper control branch is energized, and the first coil of the second solenoid reversing valve controlling the second wheel stopper control branch is energized to control the rise of the first wheel stopper cylinder of the first wheel stopper control branch and the second wheel stopper cylinder of the second wheel stopper control branch.

[0077] In response to the gradual increase in system pressure of the hydraulic control system of the flap unloading platform, the first coil a of the first electromagnetic reversing valve 34 or the second electromagnetic reversing valve 44 is energized to control the first wheel stopper cylinder 31 or the second wheel stopper cylinder 32 to extend.

[0078] Step S22: in response to the first wheel choke oil cylinder and the second wheel choke oil cylinder moving to the preset position, controlling the first coil of the first electromagnetic reversing valve to be de-energized, and controlling the first coil of the second electromagnetic reversing valve to be de-energized.

[0079] Among them, the preset position of this embodiment can be the maximum lifting height of the first wheel stopper cylinder 31 and the second wheel stopper cylinder 32. Therefore, after the first wheel stopper cylinder 31 and the second wheel stopper cylinder 32 are extended into place, the first coil a controlling the first solenoid reversing valve 34 or the second solenoid reversing valve 44 is powered off.

[0080] Optionally, in one embodiment, the control method of the flap unloading platform can be used to control the descent of the flap unloading platform. Figure 5 , Figure 5 yes Figure 1 The second specific flow chart of step S13 in FIG. Specifically, the following steps are included:

[0081] Step S231: In response to the system pressure increasing to a preset value, the second coil of the main solenoid valve is controlled to be energized so that the first externally controlled balancing valve of the first lifting cylinder control branch and the second externally controlled balancing valve of the second lifting cylinder control branch are pressurized and conducted.

[0082] Among them, when the system pressure of the hydraulic control system of the flap unloading platform of this embodiment increases to a preset value, the second coil b of the main electromagnetic reversing valve 101 is energized, the pilot ports of the first externally controlled balancing valve 12 and the second externally controlled balancing valve 22 are pressurized, the first externally controlled balancing valve 12 and the second externally controlled balancing valve 22 are connected, the flap unloading platform begins to descend and flip, and the first lifting cylinder 11 and the second lifting cylinder 21 are controlled synchronously by adjusting the first proportional throttle valve 13 and the second proportional throttle valve 23.

[0083] Step S232: Control the first lifting cylinder to output driving fluid through the first externally controlled balancing valve and the second lifting cylinder to output driving fluid through the second externally controlled balancing valve, so as to control the first lifting cylinder and the second lifting cylinder to descend.

[0084] Among them, when the second coil b of the main solenoid valve 101 is energized, the first lifting cylinder 11 and the second lifting cylinder 21 can deliver driving fluid, that is, deliver oil, to the oil tank 80 through the main solenoid valve 101 to control the first lifting cylinder 11 and the second lifting cylinder 21 to descend.

[0085] Please continue reading Figure 6 , Figure 6 yes Figure 1 The second specific flow chart of step S14 in FIG. Specifically, the following steps are included:

[0086] Step S241: In response to the flap unloading platform rotating to an angle of zero with the horizontal plane, the second coil of the main solenoid valve is powered off to control the first lifting cylinder and the second lifting cylinder to stop moving.

[0087] The present embodiment is used to control the flap unloading platform to rotate and descend, and the preset angle of the present embodiment is 0 degrees. When the flap unloading platform descends to a horizontal plane angle of zero degrees, the second coil b of the main electromagnetic reversing valve 101 is powered off, and the flap unloading platform stops descending and flipping.

[0088] Step S242: Control the opening of the proportional speed regulating valve to gradually increase so that the system pressure of the hydraulic control system of the flap unloading platform gradually decreases, and control the power drive branch to be disabled.

[0089] The processor 102 controls the proportional speed regulating valve 72 so that its opening gradually increases from a small opening, the hydraulic control system of the flap unloading platform is depressurized, and the electromagnetic overflow valve 54 is powered off.

[0090] Optionally, in this embodiment, the control method of the flap unloading platform may further include the following steps to achieve the control of the wheel stopper of the flap unloading platform to descend. Figure 7 , Figure 7 This is a flow chart of the second embodiment of the control method of the flap unloading platform of the present application. Specifically, it includes the following steps:

[0091] Step S31: In response to the flap unloading platform rotating to an angle of zero with the horizontal plane, the second coil of the first solenoid reversing valve of the first wheel stopper control branch is energized, and the second coil of the second solenoid reversing valve of the second wheel stopper control branch is energized to control the first wheel stopper cylinder of the first wheel stopper control branch and the second wheel stopper cylinder of the second wheel stopper control branch to descend.

[0092] When the flap unloading platform rotates to a zero angle with the horizontal plane, the second coil b of the first electromagnetic reversing valve 34 or the second electromagnetic reversing valve 44 is energized to control the first wheel stopper cylinder 31 or the second wheel stopper cylinder 32 to contract.

[0093] Step S32: in response to the first wheel chock cylinder and the second wheel chock cylinder being retracted to the initial position, the second coil of the first electromagnetic reversing valve is controlled to be de-energized, and the second coil of the second electromagnetic reversing valve is controlled to be de-energized.

[0094] When the first wheel stopper cylinder 31 or the second wheel stopper cylinder 32 contracts to the initial position, that is, the first wheel stopper cylinder 31 or the second wheel stopper cylinder 32 has dropped to the lowest position, the second coil b controlling the first electromagnetic reversing valve 34 or the second electromagnetic reversing valve 44 is de-energized.

[0095] The above are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A control method for a flap unloading platform, applied to a hydraulic control system of the flap unloading platform, wherein the hydraulic control system of the flap unloading platform comprises a first lifting cylinder control branch, a second lifting cylinder control branch, a power drive branch, a main electromagnetic reversing valve and an inclination sensor, wherein the first lifting cylinder control branch comprises a first lifting cylinder and a first proportional throttle valve, and the second lifting cylinder control branch comprises a second lifting cylinder and a second proportional throttle valve, and wherein: include: Acquire a start signal, and enable the power drive branch based on the start signal; The system pressure of the hydraulic control system of the flap unloading platform is gradually increased by using the power drive branch circuit to control the flap unloading platform; In response to the system pressure being equal to a preset value, the power-on state of the main solenoid valve is changed, the main solenoid valve is controlled to switch from a first working state to a second working state, the first proportional throttle valve and the second proportional throttle valve are adjusted based on the second working state of the main solenoid valve, the first lifting cylinder and the second lifting cylinder are controlled to move, and the flap unloading platform is driven to rotate; In response to the flap unloading platform rotating to a preset angle, the power-on state of the main solenoid valve is changed, the main solenoid valve is controlled to switch from the second working state to the first working state, and the flap unloading platform is controlled to stop rotating based on the first working state of the main solenoid valve; Wherein, the action values ​​of the first lifting cylinder and the second lifting cylinder are adjusted based on the feedback signal of the inclination sensor.

2. The control method of the flap unloading platform according to claim 1, characterized in that: The control method of the flap unloading platform also includes: Using the tilt sensor to obtain the tilt angle of the flap unloading platform; In response to the roll angle being greater than a first preset value or less than a second preset value, the first proportional throttle valve or the second proportional throttle valve is adjusted to keep the roll angle between the second preset value and the first preset value.

3. The control method of the flap unloading platform according to claim 1, characterized in that: The step of changing the power-on state of the main solenoid valve in response to the system pressure being equal to a preset value, controlling the main solenoid valve to switch from a first working state to a second working state, adjusting the first proportional throttle valve and the second proportional throttle valve based on the second working state of the main solenoid valve, controlling the first lifting cylinder and the second lifting cylinder to move, and driving the flap unloading platform to rotate includes: In response to the system pressure increasing to the preset value, controlling the first coil of the main solenoid valve to be energized; The driving fluid is delivered to the first lifting cylinder and the second lifting cylinder based on the main solenoid valve to control the first lifting cylinder and the second lifting cylinder to rise.

4. The control method of the flap unloading platform according to claim 3 is characterized in that: The hydraulic control system of the flap unloading platform further includes a proportional speed regulating valve, and the step of using the power drive branch to control the system pressure of the hydraulic control system of the flap unloading platform to gradually increase includes: In response to the enabling of the power drive branch, the opening of the proportional speed regulating valve is controlled to gradually decrease, so that the system pressure of the hydraulic control system of the flap unloading platform is gradually increased.

5. The control method of the flap unloading platform according to claim 4, characterized in that: The step of changing the power-on state of the main solenoid valve in response to the flap unloading platform rotating to a preset angle, controlling the main solenoid valve to switch from the second working state to the first working state, and controlling the flap unloading platform to stop rotating based on the first working state of the main solenoid valve comprises: In response to the flap unloading platform rotating to a preset angle, the first coil of the main solenoid valve is controlled to be de-energized to control the first lifting cylinder and the second lifting cylinder to stop moving; wherein the preset angle is the angle between the flap unloading platform and the horizontal plane, and the preset angle is greater than zero and less than ninety degrees; The opening of the proportional speed regulating valve is controlled to gradually increase so that the system pressure of the hydraulic control system of the flap unloading platform is gradually reduced, and the power drive branch is controlled to be disabled.

6. The control method of the flap unloading platform according to claim 3, characterized in that: The hydraulic control system of the flap unloading platform further includes a first wheel chock control branch and a second wheel chock control branch, and the control method of the flap unloading platform also includes: In response to the gradual increase in the system pressure of the hydraulic control system of the flap unloading platform, the first coil of the first electromagnetic reversing valve of the first wheel stopper control branch is energized, and the first coil of the second electromagnetic reversing valve of the second wheel stopper control branch is energized, so as to control the first wheel stopper cylinder of the first wheel stopper control branch and the second wheel stopper cylinder of the second wheel stopper control branch to rise; In response to the first wheel chock cylinder and the second wheel chock cylinder moving to a preset position, the first coil of the first electromagnetic reversing valve is controlled to be de-energized, and the first coil of the second electromagnetic reversing valve is controlled to be de-energized.

7. The control method of the flap unloading platform according to claim 1, characterized in that: The step of changing the power-on state of the main solenoid valve in response to the system pressure being equal to a preset value, controlling the main solenoid valve to switch from a first working state to a second working state, adjusting the first proportional throttle valve and the second proportional throttle valve based on the second working state of the main solenoid valve, controlling the first lifting cylinder and the second lifting cylinder to move, and driving the flap unloading platform to rotate includes: In response to the system pressure increasing to the preset value, the second coil of the main solenoid valve is controlled to be energized, so that the first externally controlled balancing valve of the first lifting cylinder control branch and the second externally controlled balancing valve of the second lifting cylinder control branch are pressurized and conducted; The first lifting cylinder is controlled to output driving fluid through the first externally controlled balancing valve and the second lifting cylinder is controlled to output driving fluid through the second externally controlled balancing valve, so as to control the first lifting cylinder and the second lifting cylinder to descend.

8. The control method of the flap unloading platform according to claim 7, characterized in that: The hydraulic control system of the flap unloading platform further includes a proportional speed regulating valve, and the step of using the power drive branch to control the system pressure of the hydraulic control system of the flap unloading platform to gradually increase includes: In response to the enabling of the power drive branch, the opening of the proportional speed regulating valve is controlled to gradually decrease, so that the system pressure of the hydraulic control system of the flap unloading platform is gradually increased.

9. The control method of the flap unloading platform according to claim 8, characterized in that: The step of changing the power-on state of the main solenoid valve in response to the flap unloading platform rotating to a preset angle, controlling the main solenoid valve to switch from the second working state to the first working state, and controlling the flap unloading platform to stop rotating based on the first working state of the main solenoid valve comprises: In response to the flap unloading platform rotating to an angle of zero with the horizontal plane, the second coil of the main solenoid valve is controlled to be de-energized to control the first lifting cylinder and the second lifting cylinder to stop moving; The opening of the proportional speed regulating valve is controlled to gradually increase so that the system pressure of the hydraulic control system of the flap unloading platform is gradually reduced, and the power drive branch is controlled to be disabled.

10. The control method of the flap unloading platform according to claim 7, characterized in that: The hydraulic control system of the flap unloading platform further includes a first wheel chock control branch and a second wheel chock control branch, and the control method of the flap unloading platform also includes: In response to the flap unloading platform rotating to an angle of zero with the horizontal plane, the second coil of the first electromagnetic reversing valve of the first wheel stopper control branch is controlled to be energized, and the second coil of the second electromagnetic reversing valve of the second wheel stopper control branch is controlled to be energized, so as to control the first wheel stopper cylinder of the first wheel stopper control branch and the second wheel stopper cylinder of the second wheel stopper control branch to descend; In response to the first wheel chock cylinder and the second wheel chock cylinder being contracted to an initial position, the second coil of the first solenoid reversing valve is controlled to be de-energized, and the second coil of the second solenoid reversing valve is controlled to be de-energized.

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