A material receiving hopper floating force control valve group, floating system, control method and re-mixer

Abstract

The application discloses a kind of material receiving hopper floating force control valve groups, floating system, control method and compound mixer, the control valve group of the present application is connected by electric proportional pressure reducing valve operating port No. Rod cavity of the cylinder to be controlled, the rod cavity of the cylinder to be controlled is connected back oil, realizes to the control of oil cylinder thrust.The compound mixer material receiving hopper floating system, the up-and-down movement of compound mixer material receiving hopper is controlled by oil cylinder piston rod, both ensure that the tire of supporting wheel rolls along with vehicle driving, and realize the profiling movement of supporting wheel along with the change of terrain.

Description

Technical Field

[0001] This invention relates to the field of hopper control technology, and in particular to a hopper floating force control valve group, a floating system, and a remixer. Background Technology

[0002] The receiving hopper, located in front of the mixing plant, is used to receive asphalt concrete materials. Due to the limitations of the dump truck's unloading method, the receiving hopper must conform to the road surface, requiring support rollers to contact the ground. Because of the large overall weight of the hopper and asphalt concrete materials, and the space constraints on the support rollers below the hopper, the limited size results in a small ground contact area and high overall ground pressure. During construction, due to the high temperature of the asphalt pavement, this condition can easily cause deep ruts on the support rollers, severely affecting the subsequent pavement quality. Summary of the Invention

[0003] The purpose of this invention is to provide a hopper floating force control valve group, a floating system, a control method, and a remixer. By adjusting the ground contact pressure of the support roller through the floating force control valve group, the support roller can achieve contour-following motion according to the terrain changes while ensuring that the tires of the support roller passively roll with the vehicle (in the forward and backward direction of the vehicle).

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] In a first aspect, the present invention provides a hopper buoyancy control valve assembly, including an accumulator;

[0006] The accumulator is connected to an external pressure oil source to provide a rapid pressure oil source;

[0007] The accumulator is connected to the rodless chamber of the cylinder of the receiving hopper to be controlled via an electro-proportional pressure reducing valve and a first electromagnetic shut-off valve.

[0008] The accumulator is connected to the rod chamber of the cylinder of the receiving hopper to be controlled via an unloading valve and a second solenoid shut-off valve.

[0009] The unloading valve is used to sense the accumulator filling pressure and control the accumulator to fill or stop filling.

[0010] The unloading valve is connected to the load feedback port LS of an external pressure oil source via a load feedback check valve.

[0011] Furthermore, port a of the accumulator is connected to port a of the electro-proportional pressure reducing valve, port b of the electro-proportional pressure reducing valve is the drain port and is connected to the external return port T; port c of the electro-proportional pressure reducing valve is the working port and is connected to the first electromagnetic shut-off valve.

[0012] Furthermore, a one-way throttle valve is provided between the first electromagnetic shut-off valve and the rodless chamber of the cylinder of the receiving hopper to be controlled.

[0013] Furthermore, port a of the first electromagnetic shut-off valve is connected to port c of the electro-proportional pressure reducing valve, and port b of the first electromagnetic shut-off valve is connected to port a of the one-way throttle valve; port b of the one-way throttle valve is connected to the rodless chamber of the cylinder of the receiving hopper to be controlled.

[0014] Furthermore, port a of the accumulator is connected to port c of the unloading valve, and port b of the unloading valve is connected to the external oil return port T; port b of the unloading valve is connected to port a of the second electromagnetic shut-off valve, and port b of the second electromagnetic shut-off valve is used to connect to the rod chamber of the cylinder of the receiving hopper to be controlled.

[0015] Furthermore, a filling orifice is provided between the accumulator and the external pressure oil source.

[0016] Furthermore, a one-way valve for filling is provided between the filling orifice and the accumulator.

[0017] Furthermore, an electromagnetic switching valve is provided between the load feedback check valve and the external pressure oil source.

[0018] Furthermore, a buffer throttling orifice is provided between the electromagnetic switching valve and the load feedback check valve;

[0019] Port a of the electromagnetic switch valve is connected to port a of the liquid filling check valve and port b of the liquid filling throttling orifice. Port b of the electromagnetic switch valve is connected to port a of the buffer throttling orifice. Port b of the buffer throttling orifice is connected to port a of the load feedback check valve and port a of the unloading valve.

[0020] Furthermore, the control valve assembly also includes a pressure sensor, which is used to detect the working pressure at port C of the electro-proportional pressure reducing valve and provide feedback to correct the set value of the electro-proportional pressure reducing valve.

[0021] In a second aspect, the present invention provides a floating hopper system, comprising a hopper, support rollers, hydraulic cylinders, a frame, and the aforementioned hopper floating force control valve group;

[0022] The receiving hopper is connected to the vehicle frame via a first pin, and the receiving hopper floats up and down around the first pin.

[0023] The hydraulic cylinder is connected to the vehicle frame via a second pin, and the hydraulic cylinder floats up and down around the second pin;

[0024] The rodless chamber and the rod chamber of the hydraulic cylinder are connected to the floating force control valve group of the receiving hopper, which is used to control the piston rod thrust of the hydraulic cylinder.

[0025] The piston rod of the hydraulic cylinder is connected to the receiving hopper via a pin, and is used to control the up and down floating of the receiving hopper through the receiving hopper floating force control valve group;

[0026] The support roller is located below the receiving hopper, and the support roller is used to perform contour-following motion as the receiving hopper floats up and down.

[0027] Thirdly, the present invention provides a method for floating a receiving hopper, which uses the aforementioned receiving hopper floating system to control the floating of the receiving hopper, the method comprising:

[0028] The accumulator of the receiving hopper buoyancy control valve group supplies oil to the electro-proportional pressure reducing valve in the receiving hopper buoyancy control valve group, so that the c port of the electro-proportional pressure reducing valve operates according to the set pressure.

[0029] The electromagnetic switch valve, the first electromagnetic stop valve and the second electromagnetic stop valve of the receiving hopper floating force control valve group are energized, and the corresponding oil circuit is opened, so that the receiving hopper floating force control valve group works in floating mode.

[0030] When the ground sinks, the oil in the accumulator is supplied to the rodless chamber of the cylinder of the floating hopper system through the electro-proportional pressure reducing valve, the first electromagnetic shut-off valve, and the one-way throttle valve. The oil in the rod chamber of the cylinder is discharged through the return oil pipeline, causing the cylinder to retract and driving the receiving hopper to pitch downward around the first pin axis.

[0031] When the ground rises, the rodless chamber of the cylinder of the receiving hopper floating system discharges oil through the electro-proportional pressure reducing valve of the receiving hopper floating force control valve group, and the rod chamber of the cylinder freely draws oil through the return oil pipeline, causing the cylinder to extend and drive the receiving hopper to pitch upward around the first pin axis.

[0032] Furthermore, the accumulator of the receiving hopper buoyancy control valve group supplies oil to the electro-proportional pressure reducing valve in the receiving hopper buoyancy control valve group, including:

[0033] The external pressure oil source P port pressure oil is delivered to port a of the unloading valve through the filling throttle orifice, the solenoid switch valve and the buffer throttle orifice.

[0034] The pressure of the accumulator is sensed through port c of the unloading valve. If the lower limit of the filling pressure set by the unloading valve is not reached, the unloading valve is blocked from port a to port b. The pressure at port a of the unloading valve rises and is fed back to the external pressure feedback port LS through ports a and b of the load feedback check valve to fill the accumulator.

[0035] When the unloading valve senses that the pressure of the accumulator has reached the upper limit of the filling pressure set by the unloading valve at port c, the unloading valve opens from port a to port b, the unloading valve begins to depressurize, so that the pressure fed back to the external pressure feedback port LS is zero, and the accumulator stops filling.

[0036] Fourthly, the present invention provides a remixer, including the aforementioned floating hopper system.

[0037] The beneficial effects of this invention are as follows:

[0038] This invention provides a floating force control valve assembly for the receiving hopper of a mixing machine. The assembly connects to the rodless chamber of the controlled cylinder via a proportional pressure reducing valve, while the rod chamber of the controlled cylinder receives return oil, thus controlling the cylinder thrust. The energy storage function of the accumulator improves the response speed of cylinder pressure regulation; the accumulator's filling is controlled through the cooperation of an electromagnetic switch valve, a throttle valve, a check valve, and an unloading valve.

[0039] This invention also provides a floating system for the receiving hopper of a mixing plant. The system controls the up-and-down movement of the receiving hopper using a hydraulic cylinder piston rod, ensuring that the support rollers roll with the vehicle while also allowing them to follow the contours of the terrain. Furthermore, this invention also prevents excessive pressure on the support rollers' tires when the material in the hopper is heavy, thanks to the hydraulic cylinder providing support. Attached Figure Description

[0040] Figure 1 The control principle diagram of the hopper floating force control valve group provided by the present invention;

[0041] Figure 2 The structural diagram of the floating hopper system provided by the present invention;

[0042] Figure 3 This is a schematic diagram of the floating receiving hopper in this invention; Figure 3 (a) is a schematic diagram of the downward tilting motion of the receiving hopper. Figure 3 (b) is a schematic diagram of the upward tilting motion of the receiving hopper. Detailed Implementation

[0043] The present invention will now be further described. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0044] This invention provides a hopper buoyancy control valve assembly, see [link / reference]. Figure 1It includes an electro-proportional pressure reducing valve 5-1, a liquid filling check valve 5-2, a load feedback check valve 5-8, an electromagnetic switch valve 5-3, a buffer throttle orifice 5-4, a liquid filling throttle orifice 5-7, an unloading valve 5-5, an accumulator 5-6, a first electromagnetic shut-off valve 5-9, a second electromagnetic shut-off valve 5-10, a one-way throttle valve 5-11, and a pressure sensor 5-12.

[0045] In this invention, the accumulator 5-6 is connected to the external pressure oil source P port, and the accumulator 5-6 is used to provide a rapid pressure oil source.

[0046] In this invention, the accumulator 5-6 is connected to the rodless chamber of the cylinder of the receiving hopper to be controlled via an electro-proportional pressure reducing valve 5-1 and a first electromagnetic shut-off valve 5-9.

[0047] For details, see Figure 1 The a port of accumulator 5-6 is connected to the a port of electro-proportional pressure reducing valve 5-1.

[0048] Port b of the electro-proportional pressure reducing valve 5-1 is the drain port, which is connected to the external return port T.

[0049] Port C of the electro-proportional pressure reducing valve 5-1 is the working port and is connected to the first solenoid shut-off valve 5-9.

[0050] Furthermore, in this invention, a one-way throttle valve 5-11 is also provided between the first electromagnetic shut-off valve 5-9 and the rodless chamber of the oil cylinder; by setting the one-way throttle valve, damping control is achieved when the hopper falls, preventing the hopper from falling too fast and playing a role in stall protection.

[0051] See Figure 1 The first electromagnetic shut-off valve 5-9's port a is connected to the electro-proportional pressure reducing valve 5-1's port c, and the first electromagnetic shut-off valve 5-9's port b is connected to the one-way throttle valve 5-11's port a; the one-way throttle valve 5-11's port b is connected to the rodless chamber of the cylinder of the receiving hopper to be controlled.

[0052] In this invention, the accumulator 5-6 is connected to the rod chamber of the cylinder of the receiving hopper to be controlled via the unloading valve 5-5 and the second electromagnetic shut-off valve 5-10.

[0053] The unloading valve 5-5 is used to sense the accumulator filling pressure and control the accumulator filling or stopping. When the accumulator pressure is lower than the lower limit of the filling pressure, the unloading valve closes, the load pressure can be fed back normally, and the accumulator is filled. When the accumulator pressure reaches the upper limit of the filling pressure, the unloading valve unloads the load feedback oil circuit, and the accumulator completes filling.

[0054] For details, see Figure 1The a port of accumulator 5-6 is connected to the c port of unloading valve 5-5, and the b port of unloading valve 5-5 is connected to the external return oil port T; the b port of unloading valve 5-5 is connected to the a port of the second electromagnetic shut-off valve 5-10, and the b port of the second electromagnetic shut-off valve 5-10 is used to connect to the rod chamber of the cylinder of the receiving hopper to be controlled.

[0055] In this invention, the unloading valve 5-5 is connected to the load feedback port LS of an external pressure oil source via a load feedback check valve 5-8. By arranging a load feedback check valve 5-8 between the unloading valve 5-5 and the pressure feedback pipeline of the external pressure oil source, the load pressure feedback signal is allowed to be transmitted unidirectionally to the pressure feedback pipeline of the external pressure oil source, thereby controlling the accumulator 5-6 to fill or stop.

[0056] For details, see Figure 1 The a port of the unloading valve 5-5 is connected to the a port of the load feedback check valve 5-8, and the b port of the load feedback check valve 5-8 is connected to the load feedback port LS of the external pressure feedback pipeline.

[0057] In this invention, the rodless chamber and the rod chamber of the hydraulic cylinder are respectively connected to electromagnetic shut-off valves. When the floating mode is turned on, the electromagnetic shut-off valve is in the passage. When the floating mode is turned off, the electromagnetic shut-off valve closes the oil passage, providing isolation conditions for other valve groups to control the attitude of the hydraulic cylinder and satisfying the attitude control of the hopper when the vehicle is transferred.

[0058] Furthermore, a filling throttle orifice 5-7 is provided between the external pressure oil source and the accumulator 5-6 to control the filling speed of the accumulator and protect the accumulator.

[0059] Furthermore, a one-way valve 5-2 for filling is installed between the filling throttle orifice 5-7 and the accumulator 5-6. This valve controls the external pressure oil source to supply oil to the accumulator in one direction for filling. After filling stops, the one-way valve for filling plays a pressure-maintaining role.

[0060] For details, see Figure 1 The external pressure oil source P port is connected to port a of the filling throttle orifice 5-7, the filling throttle orifice 5-7 b port is connected to port a of the filling check valve 5-2, and the filling check valve 5-2 b port is connected to port a of the accumulator 5-6 and port a of the electro-proportional pressure reducing valve 5-1.

[0061] Furthermore, an electromagnetic switch valve 5-3 is installed between the load feedback check valve 5-8 and the external pressure oil source. When the floating mode is turned on, the electromagnetic switch valve 5-3 opens the load feedback oil circuit, and when the floating mode is turned off, the electromagnetic switch valve 5-3 closes the load feedback oil circuit to avoid unnecessary energy loss.

[0062] Furthermore, a buffer throttling orifice 5-4 is provided between the electromagnetic switch valve 5-3 and the load feedback check valve 5-8 to buffer the load feedback pressure.

[0063] For details, see Figure 1 The a port of the electromagnetic switch valve 5-3 is connected to the a port of the liquid filling check valve 5-2 and the b port of the liquid filling throttle orifice 5-7. The b port of the electromagnetic switch valve 5-3 is connected to the a port of the buffer throttle orifice 5-4. The b port of the buffer throttle orifice 5-4 is connected to the a port of the load feedback check valve 5-8 and the a port of the unloading valve 5-5.

[0064] Pressure sensor 5-12 is connected to the rodless chamber of the hydraulic cylinder to detect the pressure value in the rod chamber of the hydraulic cylinder and to provide feedback to correct the set value of the electro-proportional pressure reducing valve 5-1.

[0065] The control principle of the above-mentioned hopper floating force control valve group provided by the present invention is as follows:

[0066] Energizing the solenoid valves 5-3, 5-9, and 5-10 opens the corresponding oil circuits, allowing the control valve assembly to operate in floating mode. At this time, the pressure oil from the external pressure oil source P port flows through the filling throttle orifice 5-7, the solenoid valve 5-3, and the buffer throttle orifice 5-4 to port a of the unloading valve 5-5.

[0067] The pressure of the accumulator 5-6 is sensed at port c of the unloading valve 5-5. If the pressure does not reach the lower limit of the filling pressure set by the unloading valve 5-5, the connection between port a and port b of the unloading valve 5-5 will be blocked. The pressure at port a of the unloading valve 5-5 will rise and be fed back to the external pressure feedback port LS through ports a and b of the load feedback check valve 5-8. The accumulator 5-6 will then start filling.

[0068] When the pressure at port C of the unloading valve 5-5 reaches the upper limit of the set filling pressure of the accumulator 5-6, the unloading valve 5-5 opens from port A to port B, and the unloading valve 5-5 begins to depressurize. The pressure feedback to the external pressure feedback port LS is zero, and the accumulator 5-6 stops filling. This control method helps prevent the external hydraulic pump from operating under high pressure for extended periods.

[0069] In floating mode, oil is supplied to the electro-proportional pressure reducing valve 5-1 through the accumulator 5-6, and port C of the electro-proportional pressure reducing valve 5-1 always operates at the set pressure. During operation, the working pressure of port C of the electro-proportional pressure reducing valve 5-1 is detected by the pressure sensor 5-12.

[0070] During construction, when the ground subsides, the electro-proportional pressure reducing valve 5-1 supplies stable pressure oil to the rodless chamber of the cylinder via the first electromagnetic shut-off valve 5-9 and the one-way throttle valve 5-11, while the oil in the rod chamber is discharged through the return oil line. When the ground rises, the oil in the rodless chamber of the cylinder is discharged through port b of the electro-proportional pressure reducing valve 5-1, while the oil in the rod chamber is freely drawn in through the return oil line. The above control process achieves both the road surface contouring function and the constant floating force control of the cylinder.

[0071] When the floating mode is off, both electromagnetic shut-off valves 5-9 and 5-10 are closed. At this time, the hydraulic cylinder can be adjusted in attitude under the control of other directional valves, so that the support rollers can be lifted off the ground, making it convenient for the entire mixer to be moved to another location.

[0072] Based on the above-mentioned hopper floating force control valve assembly, the present invention also provides a hopper floating system, see [link to relevant documentation]. Figure 2 It includes a receiving hopper 1, a support roller 2, a hydraulic cylinder 3, a frame 4, and the aforementioned receiving hopper floating force control valve assembly.

[0073] The receiving hopper 1 is connected to the frame 4 via the first pin 4-1. The receiving hopper can rotate around the first pin 4-1 to achieve up and down floating.

[0074] One end of the hydraulic cylinder 3 is connected to the frame 4 via the second pin 4-2. The hydraulic cylinder can rotate around the second pin 4-2, thus floating up and down with the receiving hopper.

[0075] The rodless chamber and rod chamber of the hydraulic cylinder 3 are connected to the hopper floating force control valve group. The specific connection method is as described above. The hopper floating force control valve group is used to control the piston rod thrust of the hydraulic cylinder 3.

[0076] The piston rod of the hydraulic cylinder 3 is connected to the receiving hopper via pin 1-1, which is used to control the up and down floating of the receiving hopper through the receiving hopper floating force control valve group.

[0077] The support roller 2 is located below the receiving hopper. When the receiving hopper floats upward, the ground pressure of the support roller 2 decreases, thereby adjusting the ground contact pressure of the support roller.

[0078] The specific method for controlling the floating of the receiving hopper based on the above-mentioned floating hopper system is as follows:

[0079] During construction, when the ground subsides, see [reference needed]. Figure 3 (a) The receiving hopper buoyancy control valve group supplies stable pressure oil to the rodless chamber of the cylinder, while the oil in the rod chamber is discharged through the return oil line. At this time, the cylinder retracts, and the receiving hopper tilts downwards around pin 4-1; when the ground rises, see... Figure 3(b) The rodless chamber of the hydraulic cylinder is supplied with oil through the electro-proportional pressure reducing valve, and the rod chamber of the hydraulic cylinder is freely drawn in through the return oil line. At this time, the hydraulic cylinder extends and the receiving hopper moves upward around the pin 4-1. The control of the contact force of the receiving hopper support roller is achieved by adjusting the thrust of the hydraulic cylinder, which realizes both the road surface contouring function and the constant floating force control of the hydraulic cylinder.

[0080] On the other hand, during construction, after the receiving hopper 1 is lifted up and the support roller 2 leaves the ground, the electro-proportional pressure reducing valve 5-1 can only ensure the stability of the pressure in the rodless chamber of the hydraulic cylinder, and cannot control the falling speed of the receiving hopper 1. At this time, the oil output speed of the rodless chamber of the hydraulic cylinder is limited by the one-way throttle valve 5-11, thereby limiting the falling speed of the receiving hopper 1 and realizing that the support roller 2 is grounded smoothly again.

[0081] On the other hand, when the material in the receiving hopper 1 is heavy, the hydraulic cylinder provides support to prevent the tires of the support rollers from contacting the ground with excessive pressure.

[0082] Based on the above-described floating hopper system, the present invention also provides a remixer including the above-described floating hopper system.

[0083] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A buoyancy control valve assembly for a receiving hopper, characterized in that, Including energy storage devices; The accumulator is connected to an external pressure oil source to provide a rapid pressure oil source; The accumulator is connected to the rodless chamber of the cylinder of the receiving hopper to be controlled via an electro-proportional pressure reducing valve and a first electromagnetic shut-off valve. The accumulator is connected to the rod chamber of the cylinder of the receiving hopper to be controlled via an unloading valve and a second solenoid shut-off valve. The unloading valve is used to sense the accumulator filling pressure and control the accumulator to fill or stop filling. The unloading valve is connected to the load feedback port LS of an external pressure oil source via a load feedback check valve; an electromagnetic switch valve is provided between the load feedback check valve and the external pressure oil source. The control method of the control valve assembly is as follows: When the control solenoid switch valve, the first solenoid shut-off valve and the second solenoid shut-off valve are energized, the corresponding oil circuits are opened, and the control valve group operates in floating mode; at this time, the pressure oil from the external pressure oil source P port is supplied to the unloading valve a port. The pressure of the accumulator sensed by port C of the unloading valve is not reached. If the pressure does not reach the lower limit of the filling pressure set by the unloading valve, the connection between port A and port B of the unloading valve is blocked. The pressure at port A of the unloading valve rises and is fed back to the load feedback port LS through ports A and B of the load feedback check valve, and the accumulator begins to fill. When the pressure of the accumulator at port C of the unloading valve reaches the upper limit of the filling pressure set by the unloading valve, the unloading valve is connected from port A to port B, the unloading valve begins to depressurize, the pressure feedback to the load feedback port LS is zero, and the accumulator stops filling. In floating mode, oil is supplied to the electro-proportional pressure reducing valve through the accumulator, and the C port of the electro-proportional pressure reducing valve always operates at the set pressure. During construction, when the ground subsides, the electro-proportional pressure reducing valve supplies oil with stable pressure to the rodless chamber of the cylinder, while the oil in the rod chamber is discharged through the return oil line; when the ground rises, the oil in the rodless chamber of the cylinder is discharged through port b of the electro-proportional pressure reducing valve, while the oil in the rod chamber of the cylinder is freely drawn in through the return oil line; thus achieving road surface contouring and constant floating force control of the cylinder. When the floating mode is off, both the first and second electromagnetic shut-off valves are closed. At this time, the hydraulic cylinder can adjust its attitude, allowing the support rollers to lift off the ground, which facilitates the relocation of the entire mixing plant.

2. The buoyancy control valve assembly for a receiving hopper according to claim 1, characterized in that, The accumulator's port a is connected to port a of the electro-proportional pressure reducing valve, the electro-proportional pressure reducing valve's port b is the drain port, and it is connected to the external return port T; the electro-proportional pressure reducing valve's port c is the working port, and it is connected to the first electromagnetic shut-off valve.

3. The buoyancy control valve assembly for a receiving hopper according to claim 2, characterized in that, A one-way throttle valve is provided between the first electromagnetic shut-off valve and the rodless chamber of the cylinder of the receiving hopper to be controlled.

4. The buoyancy control valve assembly for a receiving hopper according to claim 3, characterized in that, Port a of the first electromagnetic shut-off valve is connected to port c of the electro-proportional pressure reducing valve, and port b of the first electromagnetic shut-off valve is connected to port a of the one-way throttle valve; port b of the one-way throttle valve is connected to the rodless chamber of the cylinder of the receiving hopper to be controlled.

5. The buoyancy control valve assembly for a receiving hopper according to claim 1, characterized in that, The accumulator's port a is connected to the unloading valve's port c, and the unloading valve's port b is connected to the external oil return port T; the unloading valve's port b is connected to the second electromagnetic shut-off valve's port a, and the second electromagnetic shut-off valve's port b is used to connect to the rod chamber of the cylinder of the receiving hopper to be controlled.

6. The buoyancy control valve assembly for a receiving hopper according to claim 1, characterized in that, A filling orifice is provided between the accumulator and the external pressure oil source.

7. A hopper floating force control valve assembly according to claim 6, characterized in that, A one-way valve for filling liquid is provided between the liquid filling orifice and the accumulator.

8. The buoyancy control valve assembly for a receiving hopper according to claim 7, characterized in that, A buffer throttling orifice is provided between the electromagnetic switch valve and the load feedback check valve; Port a of the electromagnetic switch valve is connected to port a of the liquid filling check valve and port b of the liquid filling throttling orifice. Port b of the electromagnetic switch valve is connected to port a of the buffer throttling orifice. Port b of the buffer throttling orifice is connected to port a of the load feedback check valve and port a of the unloading valve.

9. A hopper floating force control valve assembly according to claim 1, characterized in that, The control valve assembly also includes a pressure sensor, which is used to detect the working pressure at port C of the electro-proportional pressure reducing valve and provide feedback to correct the set value of the electro-proportional pressure reducing valve.

10. A floating hopper system, characterized in that, Includes a receiving hopper, support rollers, hydraulic cylinders, a frame, and a buoyancy control valve assembly for the receiving hopper as described in any one of claims 1 to 9; The receiving hopper is connected to the vehicle frame via a first pin, and the receiving hopper floats up and down around the first pin. The hydraulic cylinder is connected to the vehicle frame via a second pin, and the hydraulic cylinder floats up and down around the second pin; The rodless chamber and the rod chamber of the hydraulic cylinder are connected to the floating force control valve group of the receiving hopper, which is used to control the piston rod thrust of the hydraulic cylinder. The piston rod of the hydraulic cylinder is connected to the receiving hopper via a pin, and is used to control the up and down floating of the receiving hopper through the receiving hopper floating force control valve group; The support roller is located below the receiving hopper, and the support roller is used to perform contour-following motion as the receiving hopper floats up and down.

11. A method for floating a receiving hopper, characterized in that, The method of controlling the floating of the receiving hopper using the floating hopper system of claim 10 includes: The accumulator of the receiving hopper buoyancy control valve group supplies oil to the electro-proportional pressure reducing valve in the receiving hopper buoyancy control valve group, so that the c port of the electro-proportional pressure reducing valve operates according to the set pressure. The electromagnetic switch valve, the first electromagnetic stop valve and the second electromagnetic stop valve of the receiving hopper floating force control valve group are energized, and the corresponding oil circuit is opened, so that the receiving hopper floating force control valve group works in floating mode. When the ground sinks, the oil in the accumulator is supplied to the rodless chamber of the cylinder of the floating hopper system through the electro-proportional pressure reducing valve, the first electromagnetic shut-off valve, and the one-way throttle valve. The oil in the rod chamber of the cylinder is discharged through the return oil pipeline, causing the cylinder to retract and driving the receiving hopper to pitch downward around the first pin axis. When the ground rises, the rodless chamber of the cylinder of the receiving hopper floating system discharges oil through the electro-proportional pressure reducing valve of the receiving hopper floating force control valve group, and the rod chamber of the cylinder freely draws oil through the return oil pipeline, causing the cylinder to extend and drive the receiving hopper to pitch upward around the first pin axis.

12. The floating hopper method according to claim 11, characterized in that, Oil is supplied to the electro-proportional pressure reducing valve in the hopper buoyancy control valve group via the accumulator of the hopper buoyancy control valve group, including: The external pressure oil source P port pressure oil is delivered to port a of the unloading valve through the filling throttle orifice, the solenoid switch valve and the buffer throttle orifice. The pressure of the accumulator is sensed through port c of the unloading valve. If the lower limit of the filling pressure set by the unloading valve is not reached, the unloading valve is blocked from port a to port b. The pressure at port a of the unloading valve rises and is fed back to the external pressure feedback port LS through ports a and b of the load feedback check valve to fill the accumulator. When the unloading valve senses that the pressure of the accumulator has reached the upper limit of the filling pressure set by the unloading valve at port c, the unloading valve opens from port a to port b, the unloading valve begins to depressurize, so that the pressure fed back to the external pressure feedback port LS is zero, and the accumulator stops filling.

13. A remixing machine, characterized in that, Includes the floating hopper system as described in claim 10.

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