Flow regeneration control system of slag pot carrier and control method thereof

Abstract

The invention relates to a flow regeneration control system and method for a slag pot carrier. Wherein the control system comprises a left big arm oil cylinder, a right big arm oil cylinder and a regeneration control oil way, the left big arm oil cylinder is provided with a bidirectional balance valve and a load-sensitive multi-way valve, and the left big arm oil cylinder is connected with a main oil pump through an oil inlet of the load-sensitive multi-way valve; a rodless cavity of the left big arm oil cylinder is connected with a rodless cavity of the right big arm oil cylinder through a double-pipeline anti-explosion valve, a rod cavity of the left big arm oil cylinder is connected with a rod cavity of the right big arm oil cylinder through a double-pipeline anti-explosion valve, and a rodless cavity of the right big arm oil cylinder is sequentially connected with a first flow regeneration valve and a first one-way valve. A rod cavity of the right large arm oil cylinder is sequentially connected with a second flow regeneration valve and a second one-way valve, the first one-way valve and the second one-way valve are both connected with an oil inlet of the load-sensitive multi-way valve, and the regeneration control oil way is connected with the first one-way valve and the second one-way valve at the same time. The regeneration control oil way can control opening and closing of the first flow regeneration valve and the second flow regeneration valve. The control system is good in energy-saving effect, safe and reliable.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic systems for tank trucks, and in particular to a flow regeneration control system for tank trucks, and a control method for the flow regeneration control system for tank trucks. Background Art

[0002] As a special vehicle for metallurgical logistics, the table-top tank-carrying truck frequently carries and unloads tanks during operation, which is accompanied by the conversion of the gravitational potential energy of the boom. Usually, the gravitational potential energy of the slag tank is converted into the internal energy of the oil, causing the oil temperature to rise and eventually radiate into the air, resulting in energy waste. At the same time, in order to prevent the oil temperature from rising too quickly, it is generally necessary to configure an independent cooling system for the tank-carrying truck. For a table-top tank-carrying truck with a rated load of about 70 tons, its cooling power is generally around 20 kilowatts, and a larger and more expensive radiator needs to be installed on it, which not only causes tight installation space, but also increases manufacturing costs.

[0003] In response to the above problems, flow regeneration technology is generally selected to recover part of the gravitational potential energy, which not only avoids energy waste, but also reduces the configuration pressure of the heat dissipation system. Patent CN109555743B discloses a flow regeneration utilization of a rod chamber, but does not involve the flow regeneration of a rodless chamber, so it is not suitable for the flow regeneration working condition of a tank truck frequently holding and unloading tanks; although patent CN114542540A discloses a flow regeneration utilization of a rodless chamber, it does not take into account the safety issues in the flow regeneration process, and the tank truck needs to carry nearly 100 tons of high-temperature iron slag when working, and the safety requirements are relatively high, so it is only suitable for excavator working conditions with relatively small loads and high speeds.

[0004] For off-road wheeled special transport vehicles such as tank trucks, how to focus on the overall requirements of vehicle safety, reliability and energy saving while ensuring safety, maximize the use of available working conditions to capture the energy feedback system, reduce the energy consumption of the vehicle, and contribute to the energy saving of the whole machine has become an urgent problem to be solved. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a flow regeneration control system for a tank truck which has good energy-saving effect and is safe and reliable.

[0006] The present invention adopts the following technical solution:

[0007] The present invention provides a flow regeneration control system for a tank truck, comprising a left boom oil cylinder, a right boom oil cylinder and a regeneration control oil circuit, wherein a two-way balancing valve and a load-sensitive multi-way valve are arranged on the left boom oil cylinder, the left boom oil cylinder is connected to a main oil pump through an oil inlet of the load-sensitive multi-way valve, a rodless chamber of the left boom oil cylinder and a rodless chamber of the right boom oil cylinder, as well as a rod chamber of the left boom oil cylinder and a rod chamber of the right boom oil cylinder are all connected through a double-pipeline explosion-proof valve, the rodless chamber of the right boom oil cylinder is sequentially connected to a first flow regeneration valve and a first one-way valve, the rod chamber of the right boom oil cylinder is sequentially connected to a second flow regeneration valve and a second one-way valve, the first one-way valve and the second one-way valve are both connected to the oil inlet of the load-sensitive multi-way valve, the regeneration control oil circuit is simultaneously connected to the first one-way valve and the second one-way valve, and the regeneration control oil circuit can control the opening and closing of the first flow regeneration valve and the second flow regeneration valve.

[0008] Preferably, the regeneration control oil circuit includes a proportional pressure reducing valve, a first solenoid reversing valve and a second solenoid reversing valve, one end of the proportional pressure reducing valve is connected to the first one-way valve and the second one-way valve at the same time, the other end of the proportional pressure reducing valve is connected to the first solenoid reversing valve and the second solenoid reversing valve at the same time, the first solenoid reversing valve is connected to the regeneration control end of the first flow regeneration valve, and the second solenoid reversing valve is connected to the regeneration control end of the second flow regeneration valve.

[0009] Preferably, a third one-way valve is connected between the first flow regeneration valve and the first one-way valve, the third one-way valve is connected to the priority valve, the priority valve is connected to the steering accumulator, the steering accumulator is connected to the steering gear through the energy storage power steering valve group, and the rodless chamber interface of the load-sensitive multi-way valve is connected to the priority valve through the fourth one-way valve.

[0010] Preferably, a ball valve is provided between the fourth one-way valve and the priority valve, and the ball valve is connected to the oil return valve port.

[0011] Preferably, the energy storage power steering valve group includes a fifth one-way valve, a sequence valve, an electromagnetic ball valve and a bypass safety valve. The steering accumulator is connected to the fifth one-way valve, the sequence valve, the electromagnetic ball valve and the bypass safety valve in sequence, and the bypass safety valve is connected to the oil inlet of the steering gear.

[0012] Preferably, it also includes a pilot hydraulic control oil circuit, which is connected to the regeneration control oil circuit through a shuttle valve, and the first one-way valve and the second one-way valve are also connected to the regeneration control oil circuit through the shuttle valve.

[0013] Preferably, a third electromagnetic reversing valve is provided on the regeneration control oil circuit, the third electromagnetic reversing valve is connected to the pilot oil source unloading channel, and the pilot oil source unloading channel is connected to the oil tank.

[0014] Preferably, the emergency pilot oil source on the pilot hydraulic control oil circuit is an outrigger oil cylinder, and the outrigger oil cylinder is connected to the pilot hydraulic control oil circuit via an oil delivery ball valve.

[0015] The present invention also provides a control method for the flow regeneration control system of any of the above tank trucks, including the following working conditions:

[0016] Tank holding condition: The regeneration control oil circuit controls the first flow regeneration valve to open, so that the oil in the rodless chambers of the left and right boom cylinders flows to the oil inlet of the load-sensitive multi-way valve through the first flow regeneration valve and the first check valve, and is input into the rod chambers of the left and right boom cylinders together with the oil output by the main oil pump, completing the regeneration of the rodless chamber flow;

[0017] Tank unloading condition: the regeneration control oil circuit controls the second flow regeneration valve to open, so that the oil in the rod chambers of the left and right boom cylinders can flow to the oil inlet of the load-sensitive multi-way valve through the second flow regeneration valve and the second one-way valve, and be input into the rodless chambers of the left and right boom cylinders together with the oil output by the main oil pump, thereby completing the regeneration of the rod chamber flow.

[0018] Preferably, when the pilot pressure applied by the regeneration control oil circuit to the regeneration control end of the first flow regeneration valve is 2MPa, the first flow regeneration valve is fully opened; when the pilot pressure applied by the regeneration control oil circuit to the regeneration control end of the second flow regeneration valve is 2MPa, the second flow regeneration valve is fully opened.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] In the flow regeneration control system of the tank holding truck of the present invention, the oil between the left boom cylinder and the right boom cylinder can circulate with each other, and then the first flow regeneration valve and the second flow regeneration valve can be controlled to open through the regeneration control oil circuit to enable flow regeneration and utilization between the rod chamber and the rodless chamber of the two boom cylinders, thereby realizing two-way potential energy recovery of the left boom cylinder and the right boom cylinder during the tipping process and the tank holding process, with good energy-saving effect; in addition, the two-way balancing valve can ensure the pressure maintenance of the left boom cylinder and the right boom cylinder, the load-sensitive multi-way valve can reduce the system energy consumption and improve stability, and the dual-line explosion-proof valve can ensure the reliability of the pipeline between the left boom cylinder and the right boom cylinder.

[0021] The control method of the flow regeneration control system of the tank holding vehicle of the present invention can merge the regeneration flow with the output flow of the main oil pump itself during tank holding and tank unloading conditions, thereby reducing the operation time of tank holding and unloading and effectively improving the operation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the tank holding condition of the tank holding vehicle flow regeneration control system in an embodiment of the present invention.

[0023] Figure 2 It is a schematic diagram of the tank unloading condition of the flow regeneration control system of the tank truck in an embodiment of the present invention.

[0024] Figure 3 It is a connection structure diagram of the regeneration control oil circuit on the flow regeneration control system of the tank truck in an embodiment of the present invention.

[0025] Figure 4 It is a connection structure diagram of the energy storage power steering valve group on the flow regeneration control system of the tank truck in an embodiment of the present invention.

[0026] Figure 5 It is a structural diagram of the oil source connection of the pilot hydraulic control oil circuit on the flow regeneration control system of the tank truck in an embodiment of the present invention.

[0027] The reference numerals are described as follows:

[0028] 1. Left arm cylinder 17, steering gear

[0029] 2. Right boom cylinder 18, fourth one-way valve

[0030] 3. Two-way balancing valve 19. Ball valve

[0031] 4. Load-sensitive multi-way valve 20, fifth check valve

[0032] 5. Main oil pump 21. Sequence valve

[0033] 6. Double-line explosion-proof valve 22. Solenoid ball valve

[0034] 7. First flow regeneration valve 23, bypass safety valve

[0035] 8. First one-way valve 24, shuttle valve

[0036] 9. Second flow regeneration valve 25, third electromagnetic reversing valve

[0037] 10. Second one-way valve 26. Fuel tank

[0038] 11. Proportional pressure reducing valve 27. Outrigger oil cylinder

[0039] 12. First electromagnetic reversing valve 28. Oil delivery ball valve

[0040] 13. Second electromagnetic reversing valve 100, regeneration control oil circuit

[0041] 14. Third one-way valve 200, energy storage power steering valve group

[0042] 15. Priority valve 300, pilot hydraulic control oil circuit

[0043] 16. Steering accumulator 400, pilot oil source unloading channel DETAILED DESCRIPTION

[0044] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, but not to limit the present invention.

[0045] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0046] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0048] See also Figure 1 and Figure 2 The present embodiment provides a flow regeneration control system for a tanker truck, comprising a left boom oil cylinder 1, a right boom oil cylinder 2 and a regeneration control oil circuit 100. The left boom oil cylinder 1 is provided with a two-way balancing valve 3 and a load-sensitive multi-way valve 4. The left boom oil cylinder 1 is connected to a main oil pump 5 through an oil inlet of the load-sensitive multi-way valve 4. The rodless chamber of the left boom oil cylinder 1 and the rodless chamber of the right boom oil cylinder 2, and the rod chamber of the left boom oil cylinder 1 and the rod chamber of the right boom oil cylinder 2 are all connected through a double-line explosion-proof valve 6. The rodless chamber of the right boom cylinder 2 is connected to the first flow regeneration valve 7 and the first one-way valve 8 in sequence, and the rod chamber of the right boom cylinder 2 is connected to the second flow regeneration valve 9 and the second one-way valve 10 in sequence. The first one-way valve 8 and the second one-way valve 10 are both connected to the oil inlet of the load-sensitive multi-way valve 4, and the regeneration control oil circuit 100 is connected to the first one-way valve 8 and the second one-way valve 10 at the same time. The regeneration control oil circuit 100 can control the opening and closing of the first flow regeneration valve 7 and the second flow regeneration valve 9.

[0049] In the flow regeneration control system of the tanker truck of the present embodiment, the oil between the left boom cylinder 1 and the right boom cylinder 2 can circulate with each other, and then the first flow regeneration valve 7 and the second flow regeneration valve 9 can be controlled to open through the regeneration control oil circuit 100 to enable the flow regeneration between the rod chamber and the rodless chamber of the two boom cylinders, thereby realizing two-way potential energy recovery of the left boom cylinder 1 and the right boom cylinder 2 during the tipping process and the tank holding process, with good energy-saving effect; in addition, the two-way balancing valve 3 can ensure the pressure maintenance of the left boom cylinder 1 and the right boom cylinder 2, the load-sensitive multi-way valve 4 can reduce the system energy consumption and improve stability, and the dual-line explosion-proof valve 6 can ensure the reliability of the pipeline between the left boom cylinder 1 and the right boom cylinder 2.

[0050] The tank truck flow regeneration control system of this embodiment can improve the energy-saving characteristics of the tank truck, especially the pure electric-driven table-top tank truck, by recovering the gravitational potential energy based on the rocker cylinder.

[0051] It should be noted that the two oil outlets of the load-sensing multi-way valve 4 are respectively connected to the rodless chamber and the rod chamber of the left boom cylinder 1, and the load-sensing multi-way valve 4 is also connected to the return oil valve port; in addition, the flow control entering the rod chamber and the rodless chamber of the boom cylinder is achieved through the handle control on the load-sensing multi-way valve 4.

[0052] Preferably, in this embodiment, the load-sensing multi-way valve 4 has a post-valve compensation function.

[0053] Preferably, in this embodiment, the oil inlet of the load-sensitive multi-way valve 4 is connected to the throttle port, and is loaded and cut off by the solenoid valve when the flow is regenerated. When the handle of the load-sensitive multi-way valve 4 returns to the center, the throttle port is connected again, so that it has the unloading function of controlling the pressure and the mid-position buffer effect.

[0054] Preferably, see Figure 3 The regeneration control oil circuit 100 includes a proportional pressure reducing valve 11, a first solenoid reversing valve 12 and a second solenoid reversing valve 13. One end of the proportional pressure reducing valve 11 is connected to the first check valve 8 and the second check valve 10 at the same time, and the other end of the proportional pressure reducing valve 11 is connected to the first solenoid reversing valve 12 and the second solenoid reversing valve 13 at the same time. The first solenoid reversing valve 12 is connected to the regeneration control end of the first flow regeneration valve 7, and the second solenoid reversing valve 13 is connected to the regeneration control end of the second flow regeneration valve 9.

[0055] The proportional control valve 11 can complete the pilot pressure regulation required for opening the first flow regeneration valve 7 and the second flow regeneration valve 9 to meet the adjustment requirements of the boom speed after the flow regeneration starts; the first solenoid reversing valve 12 and the second solenoid reversing valve 13 can control whether the pilot pressure can be applied to the regeneration control end of the corresponding flow regeneration valve. Taking the first solenoid reversing valve 12 as an example, the first solenoid reversing valve 12 is switched after being energized, and the oil in the regeneration control oil circuit 100 is able to flow to the regeneration control end of the first flow regeneration valve 7 and open the first flow regeneration valve 7.

[0056] Preferably, in this embodiment, the first solenoid reversing valve 12 and the second solenoid reversing valve 13 are interlocked to ensure that in the flow regeneration mode, only one of the first solenoid reversing valve 12 and the second solenoid reversing valve 13 is energized and in the throttling position, thereby opening the corresponding flow regeneration valve.

[0057] Preferably, in the present embodiment, the first solenoid reversing valve 12 is interlocked with the rodless chamber oil inlet control end of the load-sensitive multi-way valve 4, and the second solenoid reversing valve 13 is interlocked with the rod chamber oil inlet control end of the load-sensitive multi-way valve 4. The flow regeneration is started only when the corresponding control end of the load-sensitive multi-way valve 4 is actuated and the opening of the corresponding oil outlet on the load-sensitive multi-way valve 4 exceeds 80%. Otherwise, it is automatically closed, and even the flow regeneration mode for controlling the tank truck to start is invalid, thereby ensuring safety to the greatest extent, and the buffering of the starting and ending stroke positions of the boom cylinder is also automatically achieved.

[0058] Preferably, see Figures 1 to 3 A third one-way valve 14 is connected between the first flow regeneration valve 7 and the first one-way valve 8, the third one-way valve 14 is connected to a priority valve 15, the priority valve 15 is connected to a steering accumulator 16, the steering accumulator 16 is connected to a steering gear 17 via an energy storage power steering valve group 200, and the rodless cavity interface of the load-sensing multi-way valve 4 is connected to the priority valve 15 via a fourth one-way valve 18.

[0059] The oil flowing out of the first flow regeneration valve 7 can partially enter the third one-way valve 14 before entering the first one-way valve 8, and then the flow control of the priority valve 15 prioritizes the filling of the steering accumulator 16 to achieve partial energy storage and absorption, and the remaining oil is then collected at the rodless cavity interface of the load-sensitive multi-way valve 4 through the fourth one-way valve 18 and then returned to the oil; in addition, the energy stored in the steering accumulator 16 is released into the steering gear 17 through the energy storage power steering valve group 200, and this part of the oil entering the steering accumulator 16 is finally merged into the steering cylinder through the steering gear 17 to complete the steering action of the vehicle.

[0060] Preferably, in the present embodiment, the steering accumulator 16 is a bladder-type steering accumulator, and the pre-charge pressure is above 6 MPa.

[0061] Preferably, see Figure 1 and Figure 2 A ball valve 19 is provided between the fourth one-way valve 18 and the priority valve 15. The ball valve 19 is connected to the oil return valve port. The unloading can be achieved by opening the ball valve 19.

[0062] Preferably, see Figure 4 The energy storage power steering valve group 200 includes a fifth one-way valve 20, a sequence valve 21, an electromagnetic ball valve 22 and a bypass safety valve 23. The steering accumulator 16 is connected to the fifth one-way valve 20, the sequence valve 21, the electromagnetic ball valve 22 and the bypass safety valve 23 in sequence. The bypass safety valve 23 is connected to the oil inlet of the steering gear 17. When the energy in the steering accumulator 16 is released into the steering gear 17 through the energy storage power steering valve group 200, the oil in the steering accumulator 16 passes through the fifth one-way valve 20, the sequence valve 21, the electromagnetic ball valve 22 and the bypass safety valve 23 in sequence, and finally enters the oil inlet of the steering gear 17.

[0063] Preferably, see Figure 1 and Figure 2 The flow regeneration control system of the tank truck of this embodiment also includes a pilot hydraulic control oil circuit 300, which is connected to the regeneration control oil circuit 100 through a shuttle valve 24, and the first one-way valve 8 and the second one-way valve 10 are also connected to the regeneration control oil circuit 100 through the shuttle valve 24.

[0064] When the engine or motor fails and the tank truck loses power, for safety reasons the suspended slag tank is generally unloaded to the ground or reset to a safe transportation position on the truck. However, at this time, there is no pressure at the oil inlet of the load-sensitive multi-way valve 4, and the flow regeneration valve cannot be opened. At this time, the pilot hydraulic control oil circuit 300 can be used as the pilot oil source for opening the flow regeneration valve. After starting the flow regeneration mode, the handle control of the load-sensitive multi-way valve 4 will automatically realize the tank unloading or resetting operation. Moreover, if it is under the rodless cavity flow regeneration condition, the ball valve 19 can also be opened at the same time to further increase the speed of the boom.

[0065] Preferably, see Figures 1 to 3 A third electromagnetic reversing valve 25 is provided on the regeneration control oil circuit 100 . The third electromagnetic reversing valve 25 is connected to the pilot oil source unloading channel 400 . The pilot oil source unloading channel 400 is connected to the oil tank 26 .

[0066] Preferably, see Figure 5 The emergency pilot oil source on the pilot hydraulic control oil circuit 300 is the outrigger cylinder 27, which is connected to the pilot hydraulic control oil circuit 300 through the oil delivery ball valve 28. Before the tank unloading process is started, the outriggers are generally lowered for auxiliary support. The internal pressure of the outrigger cylinder 27 is generally 10-20MPa. Therefore, the outrigger cylinder 27 can be used as the pilot oil source for opening the flow regeneration valve under the emergency tank unloading condition. By opening the oil delivery ball valve 28, the oil in the outrigger cylinder 27 can be delivered to the pilot hydraulic control oil circuit 300.

[0067] It should be noted that, in addition to the outrigger oil cylinder 27, other external oil sources, such as an emergency motor power unit, can also be introduced to realize the remote control one-button tank unloading function.

[0068] This embodiment also provides a control method for the above tanker flow regeneration control system, including the following working conditions, combined with Figures 1 to 5 :

[0069] Tank holding condition: the regeneration control oil circuit 100 controls the first flow regeneration valve 7 to open, so that the oil in the rodless chambers of the left boom oil cylinder 1 and the right boom oil cylinder 2 flows to the oil inlet of the load-sensitive multi-way valve 4 through the first flow regeneration valve 7 and the first check valve 8, and is input into the rod chambers of the left boom oil cylinder 1 and the right boom oil cylinder 2 together with the oil output by the main oil pump 5, completing the regeneration of the rodless chamber flow;

[0070] Tank unloading condition: the regeneration control oil circuit 100 controls the second flow regeneration valve 9 to open, so that the oil in the rod chambers of the left boom cylinder 1 and the right boom cylinder 2 can flow to the oil inlet of the load-sensitive multi-way valve 4 through the second flow regeneration valve 9 and the second one-way valve 10, and are input into the rodless chambers of the left boom cylinder 1 and the right boom cylinder 2 together with the oil output by the main oil pump 5, thereby completing the regeneration of the rod chamber flow.

[0071] The control method of the flow regeneration control system of the tanker truck of this embodiment can merge the regeneration flow with the output flow of the main oil pump 5 itself during tank holding and tank unloading conditions, thereby reducing the operation time of tank holding and unloading and effectively improving the operation efficiency.

[0072] Preferably, when the pilot pressure applied by the regeneration control oil circuit 100 to the regeneration control end of the first flow regeneration valve 7 is 2MPa, the first flow regeneration valve 7 is fully opened; when the pilot pressure applied by the regeneration control oil circuit 100 to the regeneration control end of the second flow regeneration valve 9 is 2MPa, the second flow regeneration valve 9 is fully opened.

[0073] Combination Figures 1 to 5 After the tanker vehicle flow regeneration control system of this embodiment is installed on the tanker vehicle for use, the following description is given:

[0074] When the boom starts to unload or turn over the tank, the first flow regeneration valve 7 and the second flow regeneration valve 9 are completely closed and in a pressure-maintaining state. The boom movement is completely completed by the load-sensitive multi-way valve 4 and the two-way balancing valve 3. The boom movement speed is determined by the opening of the load-sensitive multi-way valve 4 and the actual maximum flow capacity of the main oil pump 5.

[0075] Under the tank unloading condition, when the boom moves to the center point of the rocker arm, the boom load begins to enter the negative load process. At this time, the rod chamber is under pressure, and the pressure increases with the increase of load and the increase of tilting angle; while the pressure of the rodless chamber is only the pressure of the reverse opening of the two-way balance valve 3. Then, the flow regeneration mode is started by the button in the driver's cab, and the rod chamber pressure is used as the pilot pressure to be transmitted to the inlet oil of the third electromagnetic reversing valve 25 through the second one-way valve 10 and the shuttle valve 24. After that, the third electromagnetic reversing valve 25 is switched to make the rod chamber pressure transmitted to the proportional pressure reducing valve 11. The controller then gives a suitable current, and the proportional pressure reducing valve 11 outputs a proportional pressure. Then the load-sensitive multi-way valve 4 controls the associated opening of the second electromagnetic reversing valve 13, and then transmits the pilot pressure to the regeneration control end of the second flow regeneration valve 9, so that the second flow regeneration valve 9 is opened. At this time, the oil in the rod chamber is gradually increased according to the pressure difference relative to the oil inlet of the load-sensitive multi-way valve 4, and finally the flow regeneration is completed.

[0076] When the tank is turned over or unloaded, as the handle opening of the load-sensitive multi-way valve 4 decreases, the controller automatically stops the flow regeneration function and realizes speed buffering through the proportional control of the proportional pressure reducing valve 11. The left boom cylinder 1 and the right boom cylinder 2 return to the normal safe working condition with two-way pressure maintenance by the two-way balance valve 3.

[0077] Under the tank holding condition, when the boom oil cylinder has not passed the center position, its own retraction movement completely depends on the opening and balance of the two-way balance valve 3, and the retraction speed completely depends on the flow of the load-sensitive multi-way valve 4 and the main oil pump 5. However, after the boom exceeds the center position of the rocker arm, only the first flow regeneration valve 7 can be opened, and part of the flow of the rodless chamber is collected in front of the load-sensitive multi-way valve 4 through the first one-way valve 8 and supplements the rod chamber together with the flow of the main oil pump 5. The other part of the flow of the rodless chamber enters the priority valve 15 through the third one-way valve 14. The priority flow of the priority valve 15 is connected to the steering accumulator 16 for energy storage or energy replenishment, and the excess flow of the priority valve 15 returns to the oil inlet of the load-sensitive multi-way valve 4 through the fourth one-way valve 18 to achieve safe oil return.

[0078] It should be noted that the judgment of the position of the center point of the boom cylinder relative to the rocker arm movement is preferably achieved through a position sensor, assisted by the pressure changes in the rod chamber and the rodless chamber; and the opening degree of the proportional pressure reducing valve 11 is set according to the changes in the negative load chamber pressure in the cylinder and the system pressure difference. The basic principle is: when the pressure difference is small, the flow regeneration valve opens wide, and when the pressure difference is large, the flow regeneration valve opens narrowly. The test and debugging ensures the stability and safety of the change process of the combined flow and the pump supplementary flow.

[0079] In addition, there is no direct logical relationship between the speed of turning over or releasing the tank and the flow rate of opening the flow regeneration. The speed of turning over or releasing the tank is mainly controlled by the handle of the load-sensitive multi-way valve 4, and the speed is completely consistent with the speed before the big arm passes the center. The energy saving of the above process lies in the gradual reduction of the flow provided by the pump, and only the insufficient part of the regeneration flow is provided. When the regeneration is fully utilized, the flow provided by the pump will be reduced to about 25% of the original. Therefore, while saving energy and reducing consumption, the speed control safety is fully guaranteed.

[0080] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A flow regeneration control system for a tank truck, characterized in that: The invention comprises a left boom oil cylinder (1), a right boom oil cylinder (2) and a regeneration control oil circuit (100), wherein the left boom oil cylinder (1) is provided with a two-way balancing valve (3) and a load-sensitive multi-way valve (4), wherein the left boom oil cylinder (1) is connected to a main oil pump (5) via an oil inlet of the load-sensitive multi-way valve (4), wherein the rodless chamber of the left boom oil cylinder (1) and the rodless chamber of the right boom oil cylinder (2), and the rod chamber of the left boom oil cylinder (1) and the rod chamber of the right boom oil cylinder (2) are connected via a double-line explosion-proof valve (6), wherein the rodless chamber of the right boom oil cylinder (2) is connected to the rodless chamber of the right boom oil cylinder (2). The first flow regeneration valve (7) and the first non-return valve (8) are connected in sequence, the rod chamber of the right boom oil cylinder (2) is connected in sequence to the second flow regeneration valve (9) and the second non-return valve (10), the first non-return valve (8) and the second non-return valve (10) are both connected to the oil inlet of the load-sensitive multi-way valve (4), the regeneration control oil circuit (100) is simultaneously connected to the first non-return valve (8) and the second non-return valve (10), and the regeneration control oil circuit (100) can control the opening and closing of the first flow regeneration valve (7) and the second flow regeneration valve (9).

2. The flow regeneration control system for a tank truck according to claim 1 is characterized in that: The regeneration control oil circuit (100) comprises a proportional pressure reducing valve (11), a first electromagnetic reversing valve (12) and a second electromagnetic reversing valve (13); one end of the proportional pressure reducing valve (11) is connected to both the first one-way valve (8) and the second one-way valve (10); the other end of the proportional pressure reducing valve (11) is connected to both the first electromagnetic reversing valve (12) and the second electromagnetic reversing valve (13); the first electromagnetic reversing valve (12) is connected to the regeneration control end of the first flow regeneration valve (7); and the second electromagnetic reversing valve (13) is connected to the regeneration control end of the second flow regeneration valve (9).

3. The flow regeneration control system for a tank truck according to claim 1 is characterized in that: A third one-way valve (14) is connected between the first flow regeneration valve (7) and the first one-way valve (8), the third one-way valve (14) is connected to a priority valve (15), the priority valve (15) is connected to a steering accumulator (16), the steering accumulator (16) is connected to a steering gear (17) via an energy storage power steering valve group (200), and the rodless cavity interface of the load-sensing multi-way valve (4) is connected to the priority valve (15) via a fourth one-way valve (18).

4. The flow regeneration control system for a tank truck according to claim 3 is characterized in that: A ball valve (19) is provided between the fourth one-way valve (18) and the priority valve (15), and the ball valve (19) is connected to the oil return valve port.

5. The flow regeneration control system for a tank truck according to claim 3 is characterized in that: The energy storage power steering valve group (200) comprises a fifth one-way valve (20), a sequence valve (21), an electromagnetic ball valve (22) and a bypass safety valve (23); the steering accumulator (16) is connected to the fifth one-way valve (20), the sequence valve (21), the electromagnetic ball valve (22) and the bypass safety valve (23) in sequence; and the bypass safety valve (23) is connected to the oil inlet of the steering gear (17).

6. The flow regeneration control system for a tank truck according to claim 1 is characterized in that: It also includes a pilot hydraulic control oil circuit (300), wherein the pilot hydraulic control oil circuit (300) is connected to the regeneration control oil circuit (100) via a shuttle valve (24), and the first one-way valve (8) and the second one-way valve (10) are also connected to the regeneration control oil circuit (100) via the shuttle valve (24).

7. The flow regeneration control system for a tank truck according to claim 6 is characterized in that: The regeneration control oil circuit (100) is provided with a third electromagnetic reversing valve (25), the third electromagnetic reversing valve (25) is connected to a pilot oil source unloading channel (400), and the pilot oil source unloading channel (400) is connected to an oil tank (26).

8. The flow regeneration control system for a tank truck according to claim 6 is characterized in that: The emergency pilot oil source on the pilot hydraulic control oil circuit (300) is an outrigger oil cylinder (27), and the outrigger oil cylinder (27) is connected to the pilot hydraulic control oil circuit (300) via an oil delivery ball valve (28).

9. The control method of the flow regeneration control system of a tank truck according to any one of claims 1 to 8, characterized in that: The following conditions are included: Tank holding condition: the regeneration control oil circuit (100) controls the first flow regeneration valve (7) to open, so that the oil in the rodless chambers of the left boom oil cylinder (1) and the right boom oil cylinder (2) flows to the oil inlet of the load-sensitive multi-way valve (4) through the first flow regeneration valve (7) and the first check valve (8), and is input into the rod chambers of the left boom oil cylinder (1) and the right boom oil cylinder (2) together with the oil output by the main oil pump (5), thereby completing the regeneration of the rodless chamber flow; Tank unloading condition: the regeneration control oil circuit (100) controls the second flow regeneration valve (9) to open, so that the oil in the rod chambers of the left boom cylinder (1) and the right boom cylinder (2) can flow to the oil inlet of the load-sensitive multi-way valve (4) through the second flow regeneration valve (9) and the second one-way valve (10), and are input into the rodless chambers of the left boom cylinder (1) and the right boom cylinder (2) together with the oil output by the main oil pump (5), thereby completing the regeneration of the rod chamber flow.

10. The control method of the flow regeneration control system of the tank truck according to claim 9 is characterized in that: When the pilot pressure applied by the regeneration control oil circuit (100) to the regeneration control end of the first flow regeneration valve (7) is 2 MPa, the first flow regeneration valve (7) is fully opened; when the pilot pressure applied by the regeneration control oil circuit (100) to the regeneration control end of the second flow regeneration valve (9) is 2 MPa, the second flow regeneration valve (9) is fully opened.

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