Hydraulic control system of turning plate unloading platform

Abstract

The utility model discloses a hydraulic control system of a turning plate unloading platform, which comprises an oil tank, a first lifting oil cylinder control branch, a second lifting oil cylinder control branch, a first wheel retainer control branch, a second wheel retainer control branch, a power driving branch, a main electromagnetic reversing valve, a backflow branch and a processor, the first lifting oil cylinder control branch comprises a first lifting oil cylinder and a first proportional throttle valve, the second lifting oil cylinder control branch comprises a second lifting oil cylinder and a second proportional throttle valve, and the processor controls the opening degree of the first proportional throttle valve and the opening degree of the second proportional throttle valve based on feedback signals. And the first lifting oil cylinder and the second lifting oil cylinder are controlled to lift synchronously. The first proportional throttle valve and the second proportional throttle valve which are independent are controlled through the processor, independent control over the first lifting oil cylinder and the second lifting oil cylinder is achieved, and then synchronous action of the first lifting oil cylinder and the second lifting oil cylinder is guaranteed.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of logistics equipment, in particular to a hydraulic control system of a turnover plate unloading platform. BACKGROUND

[0002] With the development of truck transportation industry, a large amount of bulk materials are transported by heavy transport trucks, and after the bulk materials are transported to the destination by the heavy transport trucks, unloading is mainly carried out manually, which not only needs a large number of manpower and increases the labor cost, but also has the problems of high labor intensity, poor working conditions, slow speed, low efficiency and long queuing time of the heavy transport trucks for unloading. Therefore, the hydraulic turnover plate with the advantages of high unloading efficiency and high safety is widely used in large operation sites such as grain, coal, feed, wood chips and building.

[0003] Among them, the synchronization of the existing hydraulic turnover plate machine lifting main oil cylinder relies on a throttle valve for control, the error of the throttle valve control is large, the throttle valve is unstable due to the change of temperature and pressure, the synchronization effect is not good, and the mechanical structure is often stuck, which needs to be adjusted for many times, thereby reducing the working efficiency. The synchronization valve is used for oil cylinder synchronization, and the synchronization precision of the synchronization valve is only 3%, which cannot meet the higher precision requirement and is prone to dangerous conditions under the condition of partial load. CONTENT OF THE INVENTION

[0004] The application aims to provide a hydraulic control system of a turnover plate unloading platform to solve the above technical problems in the prior art and improve the synchronization accuracy between different oil cylinders.

[0005] The application provides a hydraulic control system of a turnover plate unloading platform, which comprises an oil tank, a first lifting oil cylinder control branch, a second lifting oil cylinder control branch, a first wheel stopper control branch, a second wheel stopper control branch, a power driving branch, a main electromagnetic reversing valve, a backflow branch and a processor. The first lifting oil cylinder control branch and the second lifting oil cylinder control branch are connected with a first end and a second end of the main electromagnetic reversing valve, a third end and a fourth end of the main electromagnetic reversing valve are connected with a first end of the power driving branch and a first end of the backflow branch, the first end of the power driving branch is further connected with the processor, the first wheel stopper control branch, the second wheel stopper control branch and the oil tank, the first end of the backflow branch is further connected with the first wheel stopper control branch and the second wheel stopper control branch, and a second end of the backflow branch is connected with the oil tank.

[0006] The first lifting oil cylinder control branch includes the first lifting oil cylinder and a first proportional throttle valve, and the second lifting oil cylinder control branch includes the second lifting oil cylinder and a second proportional throttle valve.

[0007] Further, the power driving branch includes a motor, a constant displacement hydraulic pump, a high-pressure filter, an electromagnetic overflow valve and a check valve, the motor is connected to a first end of the constant displacement hydraulic pump, a second end and a third end of the constant displacement hydraulic pump are connected to an oil tank and a first end of the high-pressure filter, a second end of the high-pressure filter is connected to a first end of the electromagnetic overflow valve and a first end of the check valve, a second end of the electromagnetic overflow valve is connected to a first end of the backflow branch, and a second end of the check valve is connected to a third end of the main electromagnetic reversing valve.

[0008] Further, the first lifting oil cylinder control branch further includes a first external control balance valve and a first hydraulic bridge, a first end of the first external control balance valve is connected to the first lifting oil cylinder, a second end of the first external control balance valve is connected to a first end of the first hydraulic bridge, a third end of the first external control balance valve is connected to a second end of the main electromagnetic reversing valve, two ends of the first proportional throttle valve are respectively connected to a second end and a third end of the first hydraulic bridge, and a fourth end of the first hydraulic bridge is connected to a first end of the main electromagnetic reversing valve.

[0009] Further, the second lifting oil cylinder control branch further includes a second external control balance valve and a second hydraulic bridge, a first end of the second external control balance valve is connected to the second lifting oil cylinder, a second end of the second external control balance valve is connected to a first end of the second hydraulic bridge, a third end of the second external control balance valve is connected to a second end of the main electromagnetic reversing valve, two ends of the second proportional throttle valve are respectively connected to a second end and a third end of the second hydraulic bridge, and a fourth end of the second hydraulic bridge is connected to a first end of the main electromagnetic reversing valve.

[0010] Further, the backflow branch includes a radiator and an oil return filter, a first end of the radiator is connected to a fourth end of the main electromagnetic reversing valve and a second end of the electromagnetic overflow valve, a second end of the radiator is connected to a first end of the oil return filter, and a second end of the oil return filter is connected to the oil tank.

[0011] Further, the hydraulic control system of the turnover unloading platform further includes a throttling speed regulation branch, a first end of the throttling speed regulation branch is connected to a third end and a fourth end of the main electromagnetic reversing valve, the first lifting oil cylinder control branch, the second lifting oil cylinder control branch, the first wheel stopper control branch and the second wheel stopper control branch, and a second end of the throttling speed regulation branch is connected to the oil tank.

[0012] Further, the throttle speed regulation branch includes a pressure gauge, a proportional speed regulation valve, and a manual down-regulation valve, the pressure gauge is connected to a first end of the proportional speed regulation valve, a first end of the manual down-regulation valve is connected to the first lifting oil cylinder control branch and the second lifting oil cylinder control branch, a second end of the proportional speed regulation valve is connected to the processor, a second end of the manual down-regulation valve, and the return flow branch.

[0013] Further, the first wheel stopper control branch includes a first wheel stopper oil cylinder, a first one-way throttle valve, a first pressure reducing valve, and a first electromagnetic reversing valve, the first wheel stopper oil cylinder is connected to a first end of the first one-way throttle valve, a second end of the first one-way throttle valve is connected to a first end of the first pressure reducing valve, a second end and a third end of the first pressure reducing valve are respectively connected to a second end of the proportional speed regulation valve and a first end of the first electromagnetic reversing valve, a second end of the first electromagnetic reversing valve is connected to the second end of the proportional speed regulation valve.

[0014] Further, the second wheel stopper control branch includes a second wheel stopper oil cylinder, a second one-way throttle valve, a second pressure reducing valve, and a second electromagnetic reversing valve, the second wheel stopper oil cylinder is connected to a first end of the second one-way throttle valve, a second end of the second one-way throttle valve is connected to a first end of the second pressure reducing valve, a second end and a third end of the second pressure reducing valve are respectively connected to a second end of the proportional speed regulation valve and a first end of the second electromagnetic reversing valve, a second end of the second electromagnetic reversing valve is connected to the second end of the proportional speed regulation valve.

[0015] Further, the hydraulic control system further includes a tilt angle sensor, the tilt angle sensor is connected to the processor, the tilt angle sensor is used to detect a side tilt angle of the flip unloading platform, and generate a feedback signal based on the side tilt angle.

[0016] Differing from the prior art, the hydraulic control system of the flip unloading platform of the present application is composed of an oil tank, a first lifting oil cylinder control branch, a second lifting oil cylinder control branch, a first wheel stopper control branch, a second wheel stopper control branch, a power drive branch, a main electromagnetic reversing valve, a return flow branch, and a processor, wherein the first lifting oil cylinder control branch includes a first lifting oil cylinder and a first proportional throttle valve, the second lifting oil cylinder control branch includes a second lifting oil cylinder and a second proportional throttle valve, the processor controls the opening degree of the first proportional throttle valve and the opening degree of the second proportional throttle valve based on the feedback signal to control the synchronous lifting of the first lifting oil cylinder and the second lifting oil cylinder. Since the first proportional throttle valve and the second proportional throttle valve independently control the liquid flow rate of the first lifting oil cylinder control branch and the second lifting oil cylinder control branch, the first lifting oil cylinder and the second lifting oil cylinder can be independently controlled, and the processor adjusts the first proportional throttle valve and the second proportional throttle valve based on the obtained feedback signal, wherein the feedback signal can feedback the side tilt angle of the flip unloading platform, thereby ensuring the synchronous action of the first lifting oil cylinder and the second lifting oil cylinder.

[0017] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and all other drawings obtained by those of ordinary skill in the art without creative labor based on the embodiments in the present application shall fall within the scope of protection of the present application.

[0019] Figure 1 is a first circuit structure schematic diagram of an embodiment of the hydraulic control system of the flip plate unloading platform of the present application;

[0020] Figure 2 is a second circuit structure schematic diagram of an embodiment of the hydraulic control system of the flip plate unloading platform of the present application;

[0021] LIST OF ELEMENTS:

[0022] 1-hydraulic control system of the flip plate unloading platform; 101-main electromagnetic directional valve; 102-processor; 103-inclination sensor; 10-first lifting oil cylinder control branch; 11-first lifting oil cylinder; 12-first external control balance valve; 13-first proportional throttle valve; 14-first hydraulic bridge circuit; 20-second lifting oil cylinder control branch; 21-second lifting oil cylinder; 22-second external control balance valve; 23-second proportional throttle valve; 24-second hydraulic bridge circuit; 30-first wheel stopper control branch; 31-first wheel stopper oil cylinder; 32-first one-way throttle valve; 33-first pressure reducing valve; 34-first electromagnetic directional valve; 40-second wheel stopper control branch; 41-second wheel stopper oil cylinder; 42-second one-way throttle valve; 43-second pressure reducing valve; 44-second electromagnetic directional valve; 50-power drive branch; 51-motor; 52-constant displacement hydraulic pump; 53-high pressure filter; 54-electromagnetic overflow valve; 55-one-way valve; 60-backflow branch; 61-radiator; 62-oil return filter; 70-throttle speed regulation branch; 71-pressure gauge; 72-proportional speed regulation valve; 73-manual down-regulation valve; 80-oil tank. DETAILED DESCRIPTION

[0023] In order to make those skilled in the art better understand the technical solutions of the present application, the hydraulic control system of the flip plate unloading platform provided by the present application will be further described in detail below in combination with the drawings and specific embodiments. It can be understood that the described embodiments are only some embodiments of the present application, but not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor shall fall within the scope of protection of the present application.

[0024] The terms "first", "second", and the like in the present application are used to distinguish different objects, rather than to describe a particular order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. 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 can optionally include steps or units not listed, or can optionally include other steps or units inherent to the process, method, product, or device.

[0025] Since the synchronization of the existing hydraulic flap lifting main oil cylinder relies on the throttle valve for control, the error of the throttle valve control can be large, the throttle valve can be unstable due to temperature and pressure changes, and the synchronization valve used for oil cylinder synchronization has a precision of up to 3%, which cannot meet higher precision requirements. Therefore, the hydraulic control system of the present application provides a kind of flap unloading platform, by setting proportional throttle valve in two lifting oil cylinder control branches respectively, independent control of two lifting oil cylinders is realized, and the feedback signal obtained by the processor is used for corresponding adjustment, which effectively improves the synchronization accuracy between the two lifting oil cylinders.

[0026] Please refer to Figures 1-2 , Figure 1 is the first structure schematic diagram of an embodiment of the hydraulic control system of the present application flap unloading platform; Figure 2 is the second structure schematic diagram of an embodiment of the hydraulic control system of the present application flap unloading platform.

[0027] As shown in Figure 1 , the hydraulic control system 1 of the present application flap unloading platform includes an oil tank 80, a first lifting oil cylinder control branch 10, a second lifting oil cylinder control branch 20, a first wheel stopper control branch 30, a second wheel stopper control branch 40, a power drive branch 50, a return flow branch 60, a main electromagnetic reversing valve 101, a processor 102, and an inclination sensor 103, the inclination sensor 103 is connected to the processor 102, the inclination sensor 103 is used to detect the roll angle of the flap unloading platform, and generates a feedback signal based on the roll angle, and sends the feedback signal to the processor 102.

[0028] Among them, the first lifting oil cylinder control branch 10 and the second lifting oil cylinder control branch 20 are connected to the first end and the second end of the main electromagnetic reversing valve 101, the third end and the fourth end of the main electromagnetic reversing valve 101 are connected to the first end of the power drive branch 50 and the first end of the return flow branch 60, the first end of the power drive branch 50 is also connected to the processor 102, the first wheel stopper control branch 30, the second wheel stopper control branch 40 and the oil tank 80, the first end of the return flow branch 60 is also connected to the first wheel stopper control branch 30 and the second wheel stopper control branch 40, and the second end of the return flow branch 60 is connected to the oil tank 80.

[0029] As Figure 2 shown, the first lifting oil cylinder control branch 10 of the embodiment includes a first lifting oil cylinder 11, a first external control balance valve 12, a first hydraulic bridge circuit 14 and a first proportional throttle valve 13, the second lifting oil cylinder control branch 20 includes a second lifting oil cylinder 21, a second external control balance valve 22, a second hydraulic bridge circuit 24 and a second proportional throttle valve 23, and the processor 102 controls the opening degree of the first proportional throttle valve 13 and the opening degree of the second proportional throttle valve 23 based on the feedback signal to control the synchronous lifting of the first lifting oil cylinder 11 and the second lifting oil cylinder 21.

[0030] Specifically, the first end of the first external control balance valve 12 is connected to the first lifting oil cylinder 11, the second end of the first external control balance valve 12 is connected to the first end of the first hydraulic bridge circuit 14, the third end of the first external control balance valve 12 is connected to the second end of the main electromagnetic reversing valve 101, the two ends of the first proportional throttle valve 13 are respectively connected to the second end and the third end of the first hydraulic bridge circuit 14, and the fourth end of the first hydraulic bridge circuit 14 is connected to the first end of the main electromagnetic reversing valve 101.

[0031] The first end of the second external control balance valve 22 is connected to the second lifting oil cylinder 21, the second end of the second external control balance valve 22 is connected to the first end of the second hydraulic bridge circuit 24, the third end of the second external control balance valve 22 is connected to the second end of the main electromagnetic reversing valve 101, the two ends of the second proportional throttle valve 23 are respectively connected to the second end and the third end of the second hydraulic bridge circuit 24, and the fourth end of the second hydraulic bridge circuit 24 is connected to the first end of the main electromagnetic reversing valve 101.

[0032] Wherein, since the first proportional throttle valve 13 and the second proportional throttle valve 23 can only flow oil in one direction, the first hydraulic bridge circuit 14 and the second hydraulic bridge circuit 24 are provided, the first lifting oil cylinder 11 and the second lifting oil cylinder 21 can receive oil flowing from the oil tank 80 and also can release oil to the oil tank 80, so as to control the lifting of the first lifting oil cylinder 11 and the second lifting oil cylinder 21, and make the flip unloading platform work normally during lifting operation.

[0033] The first proportional throttle valve 13 and the second proportional throttle valve 23 of the embodiment are used to realize the synchronous control of the first lifting oil cylinder 11 and the second lifting oil cylinder 21, the processor 102 accurately adjusts the opening degree of the first proportional throttle valve 13 and the second proportional throttle valve 23 through the feedback signal of the inclination sensor 103 installed on the flip unloading platform, and controls the synchronization of the first lifting oil cylinder 11 and the second lifting oil cylinder 21.

[0034] Specifically, the main electromagnetic reversing valve 101 of the embodiment is a three-position four-way electromagnetic reversing valve, which is used to control the lifting or lowering action of the first lifting oil cylinder 11 and the second lifting oil cylinder 21, the electromagnetic valve coil a is energized for lifting, the electromagnetic valve coil b is energized for lowering, and the lowering is realized by controlling the pilot port of the first external control balance valve 12 and the second external control balance valve 22, which are used to prevent the flip unloading platform from sliding down and to prevent the first lifting oil cylinder 11 and the second lifting oil cylinder 21 from being damaged by exceeding the set pressure.

[0035] As shown in Figure 2 , the power driving branch 50 of the embodiment includes a motor 51, a constant displacement hydraulic pump 52, a high-pressure filter 53, an electromagnetic overflow valve 54, and a check valve 55, the motor 51 is connected to the first end of the constant displacement hydraulic pump 52, the second end of the constant displacement hydraulic pump 52 is connected to the oil tank 80 and the first end of the high-pressure filter 53, the second end of the high-pressure filter 53 is connected to the first end of the electromagnetic overflow valve 54 and the first end of the check valve 55, the second end of the electromagnetic overflow valve 54 is connected to the first end of the backflow branch 60, and the second end of the check valve 55 is connected to the third end of the main electromagnetic reversing valve 101.

[0036] Among them, the high-pressure filter 53 of the embodiment is used for pressure oil filtration, and the check valve 55 is used to prevent hydraulic oil from flowing backward. The motor 51 drives the constant displacement hydraulic pump 52 to work, and the highest pressure setting and unloading control of the hydraulic control system 1 of the flip unloading platform are realized by the electromagnetic overflow valve 54.

[0037] As shown in Figure 2 , the backflow branch 60 of the embodiment includes a radiator 61 and an oil return filter 62, the first end of the radiator 61 is connected to the fourth end of the main electromagnetic reversing valve 101 and the second end of the electromagnetic overflow valve 54, the second end of the radiator 61 is connected to the first end of the oil return filter 62, and the second end of the oil return filter 62 is connected to the oil tank 80. Among them, the radiator 61 of the embodiment is used for oil return and heat dissipation of the hydraulic control system 1 of the flip unloading platform, so that the oil temperature is maintained at a suitable temperature.

[0038] As shown in Figure 1 , the first end of the throttle speed regulation branch 70 of the embodiment is connected to the third end and the fourth end of the main electromagnetic reversing valve 101, the first lifting oil cylinder control branch 10, the second lifting oil cylinder control branch 20, the first wheel stopper control branch 30, and the second wheel stopper control branch 40, and the second end of the throttle speed regulation branch 70 is connected to the oil tank 80.

[0039] As shown in Figure 2As shown, the throttle speed regulation branch 70 includes a pressure gauge 71, a proportional speed regulation valve 72, and a manual down-regulation valve 73, the pressure gauge 71 is connected to the first end of the proportional speed regulation valve 72, the first end of the manual down-regulation valve 73 is connected to the first lifting oil cylinder control branch 10 and the second lifting oil cylinder control branch 20, the second end of the proportional speed regulation valve 72 is connected to the processor 102, the second end of the manual down-regulation valve 73, and the return branch 60.

[0040] Specifically, the pressure gauge 71 is connected to the third end of the main electromagnetic reversing valve 101 and the second end of the one-way valve 55, the first end of the manual down-regulation valve 73 is connected to the first end of the first external control balance valve 12 and the first end of the second external control balance valve 22, and the second end of the proportional speed regulation valve 72 is connected to the first end of the radiator 61 and the second end of the electromagnetic overflow valve 54.

[0041] Among them, the pressure gauge 71 of the embodiment is used to display the working pressure of the hydraulic control system 1 of the flip unloading platform, the proportional speed regulation valve 72 is connected in parallel with the first lifting oil cylinder 11 and the second lifting oil cylinder 21, and is used to bypass throttle speed regulation when driving the flip unloading platform to rise, and is used to return oil throttle speed regulation when descending, and also serves as a pilot pressure relief circuit of the hydraulic control system 1 of the flip unloading platform. The manual down-regulation valve 73 is used to manually control the flip unloading platform to descend when the power is off or the hydraulic control system 1 of the flip unloading platform fails to operate.

[0042] Because the existing hydraulic system has large flow and pressure, and the liquid in the hydraulic circuit collides during pressure relief, resulting in system vibration and reducing the service life of the equipment, therefore, the proportional speed regulation valve 72 is used to slow down the pressure relief and reduce the vibration of the hydraulic control system 1 of the flip unloading platform, and improve the service life of the hydraulic control system 1 of the flip unloading platform.

[0043] As shown, Figure 2 The first wheel stopper control branch 30 of the embodiment includes a first wheel stopper oil cylinder 31, a first one-way throttle valve 32, a first pressure reducing valve 33, and a first electromagnetic reversing valve 34, the first wheel stopper oil cylinder 31 is connected to the first end of the first one-way throttle valve 32, the second end of the first one-way throttle valve 32 is connected to the first end of the first pressure reducing valve 33, the second end and the third end of the first pressure reducing valve 33 are respectively connected to the second end of the proportional speed regulation valve 72 and the first end of the first electromagnetic reversing valve 34, and the second end of the first electromagnetic reversing valve 34 is connected to the second end of the proportional speed regulation valve 72.

[0044] Optionally, the first electromagnetic reversing valve 34 of the embodiment is a three-position four-way electromagnetic reversing valve, the first electromagnetic reversing valve 34 is used to control the extension and retraction of the first wheel stopper oil cylinder 31, the first pressure reducing valve 33 is used to adjust the action pressure value of the first wheel stopper oil cylinder 31, and the first one-way throttle valve 32 is used to adjust the action speed of the first wheel stopper oil cylinder 31.

[0045] The second wheel stopper control branch 40 comprises a second wheel stopper oil cylinder 41, a second one-way throttle valve 42, a second pressure reducing valve 43, and a second electromagnetic reversing valve 44. The second wheel stopper oil cylinder 41 is connected to the first end of the second one-way throttle valve 42. The second end of the second one-way throttle valve 42 is connected to the first end of the second pressure reducing valve 43. The second end and the third end of the second pressure reducing valve 43 are respectively connected to the second end of the proportional speed regulating valve 72 and the first end of the second electromagnetic reversing valve 44. The second end of the second electromagnetic reversing valve 44 is connected to the second end of the proportional speed regulating valve 72.

[0046] Optionally, the second electromagnetic reversing valve 44 of the embodiment is a three-position four-way electromagnetic reversing valve. The second electromagnetic reversing valve 44 is used to control the extension and retraction actions of the second wheel stopper oil cylinder 41. The second pressure reducing valve 43 is used to adjust the action pressure value of the second wheel stopper oil cylinder 41. The second one-way throttle valve 42 is used to adjust the action speed of the second wheel stopper oil cylinder 41.

[0047] Specifically, the working process of the hydraulic control system 1 of the flip unloading platform of the embodiment is as follows. When the flip unloading platform needs to rise, the power driving branch 50 is started to work. The electromagnetic overflow valve 54 is powered on. The processor 102 controls the opening degree of the proportional speed regulating valve 72 to gradually decrease from large to small. The hydraulic control system 1 of the flip unloading platform is pressurized. The coil a of the first electromagnetic reversing valve 34 or the second electromagnetic reversing valve 44 is powered on. The first wheel stopper oil cylinder 31 or the second wheel stopper oil cylinder 32 is extended. After being extended to the position, the coil a of the first electromagnetic reversing valve 34 or the second electromagnetic reversing valve 44 is powered off. The coil a of the main electromagnetic reversing valve 101 is powered on. The flip unloading platform is lifted and turned over. The processor 102 receives the feedback signal obtained through the inclination sensor 103 and controls 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 oil cylinder 11 and the second lifting oil cylinder 21 are equal, so that the movements of the first lifting oil cylinder 11 and the second lifting oil cylinder 21 are synchronized, and the lateral inclination angle of the flip unloading platform is kept at ±0.2°. After the turning angle of the flip unloading platform reaches the preset angle value X, for example, 45 degrees or 60 degrees, etc., the coil a of the main electromagnetic reversing valve 101 is powered off. The flip unloading platform stops working. The processor 102 controls the proportional speed regulating valve 72 to gradually increase the opening degree from small to large. The hydraulic control system 1 of the flip unloading platform is depressurized. The electromagnetic overflow valve 4 is powered off.

[0048] When the flip unloading platform needs to be lowered, the power drive branch 50 is started to work, the electromagnetic overflow valve 54 is powered on, the processor 102 controls the proportional speed valve 72 to gradually reduce the opening degree, the hydraulic control system 1 of the flip unloading platform is pressurized, the coil b of the main electromagnetic reversing valve 101 is powered on, the pilot ports of the first external control balance valve 12 and the second external control balance valve 22 are pressurized, the first external control balance valve 12 and the second external control balance valve 22 are turned on, the flip unloading platform starts to descend and turn over, and the first proportional throttle valve 13 and the second proportional throttle valve 23 are adjusted to control the synchronization of the first lifting oil cylinder 11 and the second lifting oil cylinder 21. When the flip unloading platform is lowered to the horizontal angle value 0, the coil b of the main electromagnetic reversing valve 101 is powered off, the flip unloading platform stops descending and turning over, the coil b of the first electromagnetic reversing valve 34 or the second electromagnetic reversing valve 44 is powered on, the first stop wheel oil cylinder 31 or the second stop wheel oil cylinder 32 is retracted, and after being retracted to the position, the coil b of the first electromagnetic reversing valve 34 or the second electromagnetic reversing valve 44 is powered off. The processor 102 controls the proportional speed valve 72 to gradually increase the opening degree, the hydraulic control system 1 of the flip unloading platform is depressurized, and the electromagnetic overflow valve 54 is powered off. The whole work process is completed.

[0049] The above is only an embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. A hydraulic control system for a tilting unloading platform, characterized in that, The hydraulic control system of the tippler unloading platform includes an oil tank, a first lifting cylinder control branch, a second lifting cylinder control branch, a first wheel chock control branch, a second wheel chock control branch, a power drive branch, a main solenoid directional valve, a return branch, and a processor. The first lifting cylinder control branch and the second lifting cylinder control branch are connected to the first and second ends of the main solenoid directional valve. The third and fourth ends of the main solenoid directional valve are connected to the first end of the power drive branch and the first end of the return branch. The first end of the power drive branch is also connected to the processor, the first wheel chock control branch, the second wheel chock control branch, and the oil tank. The first end of the return branch is also connected to the first wheel chock control branch and the second wheel chock control branch. The second end of the return branch is connected to the oil tank. 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 processor controls the opening degree of the first proportional throttle valve and the opening degree of the second proportional throttle valve based on the feedback signal to control the first lifting cylinder and the second lifting cylinder to lift synchronously.

2. The hydraulic control system of the tilting unloading platform according to claim 1, characterized in that, The power drive branch includes a motor, a fixed displacement hydraulic pump, a high-pressure filter, an electromagnetic relief valve, and a check valve. The motor is connected to the first end of the fixed displacement hydraulic pump. The second and third ends of the fixed displacement hydraulic pump are connected to the oil tank and the first end of the high-pressure filter. The second end of the high-pressure filter is connected to the first end of the electromagnetic relief valve and the first end of the check valve. The second end of the electromagnetic relief valve is connected to the first end of the return branch. The second end of the check valve is connected to the third end of the main electromagnetic directional valve.

3. The hydraulic control system of the tilting unloading platform according to claim 1, characterized in that, The first lifting cylinder control branch further includes a first external control balance valve and a first hydraulic bridge circuit. The first end of the first external control balance valve is connected to the first lifting cylinder. The second end of the first external control balance valve is connected to the first end of the first hydraulic bridge circuit. The third end of the first external control balance valve is connected to the second end of the main solenoid directional valve. The two ends of the first proportional throttle valve are respectively connected to the second end and the third end of the first hydraulic bridge circuit. The fourth end of the first hydraulic bridge circuit is connected to the first end of the main solenoid directional valve.

4. The hydraulic control system of the tilting unloading platform according to claim 1, characterized in that, The second lifting cylinder control branch further includes a second external control balance valve and a second hydraulic bridge circuit. The first end of the second external control balance valve is connected to the second lifting cylinder, the second end of the second external control balance valve is connected to the first end of the second hydraulic bridge circuit, the third end of the second external control balance valve is connected to the second end of the main solenoid directional valve, the two ends of the second proportional throttle valve are respectively connected to the second end and the third end of the second hydraulic bridge circuit, and the fourth end of the second hydraulic bridge circuit is connected to the first end of the main solenoid directional valve.

5. The hydraulic control system of the tilting unloading platform according to claim 2, characterized in that, The return branch includes a radiator and a return oil filter. The first end of the radiator is connected to the fourth end of the main solenoid directional valve and the second end of the solenoid relief valve. The second end of the radiator is connected to the first end of the return oil filter, and the second end of the return oil filter is connected to the oil tank.

6. The hydraulic control system of the tilting unloading platform according to claim 1, characterized in that, The hydraulic control system of the tippler unloading platform further includes a throttling speed regulation branch. The first end of the throttling speed regulation branch is connected to the third and fourth ends of the main solenoid directional valve, the first lifting cylinder control branch, the second lifting cylinder control branch, the first wheel stop control branch, and the second wheel stop control branch. The second end of the throttling speed regulation branch is connected to the oil tank.

7. The hydraulic control system of the tilting unloading platform according to claim 6, characterized in that, The throttling speed control branch includes a pressure gauge, a proportional speed control valve, and a manual down-regulating valve. The pressure gauge is connected to the first end of the proportional speed control valve. The first end of the manual down-regulating valve is connected to the first lifting cylinder control branch and the second lifting cylinder control branch. The second end of the proportional speed control valve is connected to the processor, the second end of the manual down-regulating valve, and the return branch.

8. The hydraulic control system of the tilting unloading platform according to claim 7, characterized in that, The first wheel chock control branch includes a first wheel chock cylinder, a first one-way throttle valve, a first pressure reducing valve, and a first solenoid directional valve. The first wheel chock cylinder is connected to the first end of the first one-way throttle valve, the second end of the first one-way throttle valve is connected to the first end of the first pressure reducing valve, the second and third ends of the first pressure reducing valve are respectively connected to the second end of the proportional speed control valve and the first end of the first solenoid directional valve, and the second end of the first solenoid directional valve is connected to the second end of the proportional speed control valve.

9. The hydraulic control system of the tilting unloading platform according to claim 7, characterized in that, The second wheel chock control branch includes a second wheel chock cylinder, a second one-way throttle valve, a second pressure reducing valve, and a second solenoid directional valve. The second wheel chock cylinder is connected to the first end of the second one-way throttle valve, the second end of the second one-way throttle valve is connected to the first end of the second pressure reducing valve, the second end and the third end of the second pressure reducing valve are respectively connected to the second end of the proportional speed control valve and the first end of the second solenoid directional valve, and the second end of the second solenoid directional valve is connected to the second end of the proportional speed control valve.

10. The hydraulic control system of the tilting unloading platform according to claim 1, characterized in that, The hydraulic control system further includes a tilt sensor connected to the processor. The tilt sensor is used to detect the tilt angle of the tipping unloading platform and generate the feedback signal based on the tilt angle.

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