Dumper hydraulic system and dumper comprising same

Abstract

The utility model provides a dumper hydraulic system and a dumper comprising the same, and the dumper hydraulic system comprises an oil source comprising an oil port P and an oil port T; the supporting oil cylinder comprises an oil cavity J and an oil cavity K; the lifting oil cylinder comprises an oil cavity L and an oil cavity M; the support reversing valve is respectively connected with the oil port P, the oil port T, the oil cavity J and the oil cavity K; the lifting reversing valve is respectively connected with the oil port P, the oil port T and the oil cavity M; the pressure control assembly comprises a supporting overflow valve, the oil inlet end and the oil outlet end of the supporting overflow valve are connected with the oil port P and the oil port T respectively, and the overflow amount of the supporting overflow valve is P1; the pressure supplementing assembly comprises a pressure detection device used for detecting the pressure of the oil cavity K, a pressure supplementing oil way connected with the oil cavity K through a pressure supplementing one-way valve, and a pressure supplementing reversing valve connected with the oil cavity L, the lifting reversing valve, the pressure supplementing oil way and the pressure relief oil way. And the length of the supporting mechanism which is driven to extend downwards can be automatically adjusted along with the height change of the frame caused by the change of the load of the material box.

Description

Technical Field

[0001] The utility model relates to the field of dump trucks, in particular to a dump truck hydraulic system and a dump truck containing the same. Background Art

[0002] In order to speed up the garbage disposal efficiency, the existing dump trucks are designed to load garbage from the rear and automatically load and unload garbage. When unloading, the material box is flipped upward with the hinge between the rear bottom and the frame as the fulcrum. This makes the material box move with a large amplitude and high height during the unloading process, resulting in the rearward shift of the center of gravity of the material box during unloading, resulting in the risk of rollover. Therefore, a support leg mechanism is also provided at the bottom of the rear end of the frame, which can be extended downward to support the ground and slightly lift the rear part of the frame to stabilize the body before unloading.

[0003] However, the extended length of the existing support legs cannot automatically adjust to the lifting and lowering of the frame caused by the change in the load of the material box, resulting in the support legs being unable to provide stable and effective support to the frame during unloading. It is easy for the support legs to push the rear end of the frame too much or the support legs to not touch the ground and lose their lifting function, causing the frame to be greatly bent and deformed under the effect of the center of gravity of the material box load shifting backward, or there is a risk of rollover, which seriously affects the safety of the unloading operation and the life of the vehicle body.

[0004] In view of the problems existing in the above-mentioned prior art, the purpose of the present invention is to design a dump truck hydraulic system and a dump truck which can enable the support legs to stably and effectively support the frame. Utility Model Content

[0005] In view of the problems existing in the above-mentioned prior art, the present invention provides a dump truck hydraulic system and a dump truck containing the same, which can effectively solve the problems existing in the above-mentioned prior art.

[0006] The technical solution of the utility model is:

[0007] A dump truck hydraulic system, comprising:

[0008] Oil source, including oil port P and oil port T;

[0009] The support oil cylinder includes an oil chamber J and an oil chamber K. The support oil cylinder is used to drive the support mechanism of the corresponding dump truck to extend downward to support the ground or retract upward to reset;

[0010] A lifting cylinder, comprising an oil chamber L and an oil chamber M, is used to drive the corresponding dump truck's material box to flip and unload;

[0011] Support the reversing valve, connected to the oil port P, oil port T, oil chamber J, and oil chamber K respectively;

[0012] A lifting reversing valve is connected to the oil port P, the oil port T, and the oil chamber M respectively;

[0013] A pressure control assembly includes a support relief valve whose oil inlet and oil outlet are connected to the oil port P and the oil port T respectively, and the overflow volume of the support relief valve is P1;

[0014] The pressure compensation component includes a pressure detection device for detecting the pressure of the oil chamber K, a pressure compensation oil circuit connected to the oil chamber K through a pressure compensation one-way valve, and a pressure compensation reversing valve respectively connected to the oil chamber L, the lifting reversing valve, and the pressure compensation oil circuit.

[0015] Furthermore, the pressure-compensating assembly further includes a pressure-relief oil circuit having one end connected to the pressure-compensating oil circuit and the other end connected to the oil inlet end of the support relief valve via a pressure-relief one-way valve.

[0016] Furthermore, the pressure control component also includes a pressure control reversing valve connected to the oil port P and the oil inlet end of the support overflow valve through the oil port A1 and the oil port B1 respectively, and the pressure control reversing valve includes a left position for conducting the oil port A1 and the oil port B1, and a right position for locking the oil port B1. The set value P3 is less than P1 and P1-set value P3=0.5MPa~2MPa.

[0017] Furthermore, the pressure-control reversing valve also includes an oil port C1 and an oil port D1, and the pressure-control assembly also includes a lifting overflow valve whose oil inlet and oil outlet are respectively connected to the oil port D1 and the oil port T, and the overflow volume of the lifting overflow valve is P2. The oil port C1 is connected to the oil port T. The right position of the pressure-control reversing valve is also used to connect the oil port A1 and the oil port D1 and lock the oil port C1. The pressure-control reversing valve also includes an intermediate position for locking the oil port B1 and the oil port D1 and connecting the oil port A1 and the oil port C1.

[0018] Furthermore, the pressure-compensating reversing valve includes oil ports E, F, and G, which are respectively connected to the lifting reversing valve, oil chamber L, and pressure-compensating oil circuit. The pressure-compensating reversing valve includes a left position for connecting the oil ports E and F and locking the oil port G, and a right position for connecting the oil ports F and G and locking the oil port E.

[0019] Furthermore, the oil chamber J is a small chamber, the oil chamber K is a large chamber, the support reversing valve includes oil port A2, oil port C2, oil port B2, and oil port D2 respectively connected to the oil port P, oil port T, oil chamber K, and oil chamber J, the support reversing valve includes a left workstation for conducting the oil port A2 and oil port B2, oil port C2 and oil port D2, and a right workstation for conducting the oil port A2 and oil port D2, oil port C2 and oil port B2, and an intermediate workstation for locking the oil port A2 and oil port B2, and conducting the oil port C2 and D2, a one-way hydraulic lock is connected between the oil port D2 and the oil chamber J, and the oil inlet end of the one-way hydraulic lock is connected between the oil port B2 and the oil chamber K through an open valve oil circuit.

[0020] Furthermore, the oil chamber L is a small chamber, the oil chamber M is a large chamber, the lifting reversing valve includes oil port A3, oil port C3, oil port B3, and oil port D3 respectively connected to the oil port P, oil port T, oil chamber M, and oil port E, and the lifting reversing valve includes a left work position for conducting the oil port A3 and oil port B3, oil port C3 and oil port D3, and a right work position for conducting the oil port A3 and oil port D3, oil port C3 and oil port B3, and an intermediate work position for locking the oil port A3, oil port C3, oil port B3, and oil port D3.

[0021] A dump truck comprises the hydraulic control system as described above, as well as a vehicle chassis, a frame, a support mechanism, a material box, and a plurality of leaf springs;

[0022] The frame is located above the vehicle chassis and is connected to the vehicle chassis via a plurality of leaf springs;

[0023] The support mechanism and the support oil cylinder are arranged together at the rear part of the frame, and the support oil cylinder is used to drive the support mechanism to extend downward or retract upward;

[0024] The material box is arranged on the frame and the rear part is hinged to the frame. The two ends of the lifting cylinder are respectively hinged to the rear part of the frame and the bottom of the material box and are used to lift the material box and turn it over.

[0025] Therefore, the present invention provides the following effects and / or advantages:

[0026] 1. By adding a support overflow valve, the overflow volume P1 of the support overflow valve is used to control the length of the support mechanism extending downward, and the support mechanism stops extending downward when the driving pressure of the driving cylinder reaches P1, so that the length of the support mechanism driven to extend downward can be automatically adjusted with the change in the frame height caused by the change in the size of the material box load. Specifically, the greater the load, the lower the frame height and the support mechanism extends downward for a shorter length before touching the ground and lifting the frame, and the driving pressure of the driving cylinder reaches P1. The smaller the load, the higher the frame height and the support mechanism extends downward for a longer length before touching the ground and lifting the frame, and the driving pressure of the driving cylinder reaches P1, thereby avoiding the support mechanism from over-lifting the frame after extending downward, resulting in a large-scale frame movement under the action of the backward shift of the center of gravity of the material box load. Bending and deformation occur; at the same time, by adding a pressure-compensating component, the return oil of the oil chamber L can be pressurized into the oil chamber K through the pressure-compensating oil circuit, so that the supporting cylinder can drive the supporting mechanism downward to the top between the frame and the ground again, avoiding the load of the material box decreasing as the unloading progresses, the frame driving the supporting mechanism to move upward, resulting in the bottom of the supporting mechanism not touching the ground and losing the upward push function, which in turn causes the frame to be compressed and deformed and the vehicle to be at risk of overturning; therefore, through the setting of the pressure control component and the pressure-compensating component, the function of the supporting cylinder driving the supporting mechanism to automatically adjust the extension length with the frame height is added, and the frame deformation during unloading is reduced to about 20% of the existing technology, thereby improving the unloading operation safety and vehicle life of the dump truck as a whole.

[0027] 2. By adding a pressure relief oil circuit connected between the pressure-compensating oil circuit and the support overflow valve, the overflow volume P1 of the support overflow valve can be used again to further control the return oil of the oil chamber L to replenish the oil chamber K in real time until the pressure reaches P1, and the excess oil is overflowed through the pressure relief oil circuit and the support overflow valve to accurately control the real-time oil replenishment volume of the pressure-compensating oil circuit to the oil chamber K, ensuring that the driving mechanism can drive the support mechanism to extend downward again and can be pushed up between the frame and the ground again, and will not over-pushing to cause the frame to be easily deformed. When unloading, the downward extension length of the support mechanism can be adjusted in real time as the frame height moves upward, so as to ensure the supporting effect of the support mechanism and improve the adaptability of the support mechanism to support the frame.

[0028] 3. By setting the pressure-control reversing valve, the oil pressure at the oil inlet end of the support relief valve is prevented from disappearing, so that the pressure relief oil circuit can generate a back pressure greater than the set value P3 on the compensation oil circuit, ensuring that the return oil from the oil chamber L can be smoothly and immediately replenished into the oil chamber K, so that the function of the support cylinder driving the support mechanism to automatically adjust its extension length with the frame height can be stably realized.

[0029] 4. By adding a one-way hydraulic lock and designing an intermediate position of the support reversing valve, the oil chambers K and L can be stably pressure-maintained through the locking of the oil port B2 and the one-way hydraulic lock. At the same time, after the oil chamber K is replenished to a certain level through the pressure-replenishing oil circuit in the oil chamber L, the one-way hydraulic lock can be opened through the valve opening oil circuit to return excess oil to the oil chamber K, further ensuring that the function of the support cylinder driving the support mechanism to automatically adjust its extension length with the frame height can be stably achieved.

[0030] It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a structural diagram of a dump truck.

[0032] Figure 2 This is a structural diagram of the hydraulic system of a dump truck.

[0033] Figure 3 This is a structural diagram of the hydraulic system of a dump truck. DETAILED DESCRIPTION

[0034] In order to facilitate understanding by those skilled in the art, the structure of the present invention is further described in detail with reference to the following embodiments and accompanying drawings:

[0035] refer to Figure 1-3 A hydraulic system for a dump truck, wherein the dump truck 9 includes a chassis 91, a frame 92 connected to the chassis 91 via a plurality of leaf springs 95, a material box 94 provided on the frame 92, and a support mechanism 93 provided at the rear of the frame 92. The hydraulic system includes:

[0036] Oil source 1, including oil port P and oil port T;

[0037] The support cylinder 2 includes an oil chamber J and an oil chamber K. The support cylinder 2 is used to drive the support mechanism 93 to extend downward to support the ground or retract upward to reset;

[0038] The lifting cylinder 3 includes an oil chamber L and an oil chamber M. The lifting cylinder 3 is used to drive the material box 94 to flip and unload. Specifically, the number of the supporting cylinders 2 is set to two, and the number of the lifting cylinder 3 is set to one;

[0039] Support the reversing valve 4, connected to the oil port P, oil port T, oil chamber J, and oil chamber K respectively;

[0040] The lifting reversing valve 5 is connected to the oil port P, the oil port T, and the oil chamber M respectively;

[0041] The pressure control component 6 includes a support relief valve 61 whose oil inlet and oil outlet are connected to the oil port P and the oil port T respectively, and the overflow amount of the support relief valve 61 is P1;

[0042] The pressure compensation component 7 includes a pressure detection device 71 for detecting the pressure of the oil chamber K, a pressure compensation oil circuit 72 connected to the oil chamber K through a pressure compensation one-way valve 73, and a pressure compensation reversing valve 74 respectively connected to the oil chamber L, the lifting reversing valve 5, and the pressure compensation oil circuit 72.

[0043] The control system is used to perform the following steps when the dump truck 9 is unloading:

[0044] Supporting action of the support mechanism 93: the support reversing valve 4 is controlled to connect the oil port P and the oil chamber K, the oil port T and the oil chamber J, so that the support cylinder 2 drives the support mechanism 93 to extend downward. When the pressure of the oil port P and the oil chamber K reaches P1, causing the support relief valve 61 to open and overflow, the support mechanism 93 is placed between the vehicle frame 92 and the ground and stops extending downward. The support reversing valve 4 locks the oil chamber K.

[0045] Lifting action of the lifting cylinder 3: After the support mechanism 93 is placed between the vehicle frame 92 and the ground, the lifting reversing valve 5 is controlled to connect the oil port P and the oil chamber M, and the oil port T and the oil chamber L, so that the lifting cylinder 3 lifts the material box 94 to turn over and unload;

[0046] Pressure-compensating action of the support mechanism 93: during the process of the material box 94 turning over and unloading, as the unloading proceeds, the load on the frame 92 gradually decreases, and the support mechanism 93 is driven to gradually move upward under the elastic force of the leaf spring 95, causing the lower end of the support mechanism 93 to separate from the ground and lose its supporting function. Therefore, when the pressure detection device 71 detects that the pressure of the oil chamber K is less than the set value P3, the pressure-compensating reversing valve 74 connects the oil chamber L and the pressure-compensating oil circuit 72, and the return oil of the oil chamber L is replenished into the oil chamber K in real time, so that the support cylinder 2 drives the support mechanism 93 to extend downward again to the top between the frame 92 and the ground, and the excess oil in the oil chamber J is returned to the oil port T;

[0047] Lifting cylinder 3 in position action: After the lifting cylinder 3 lifts the material box 94 into position, it controls the lifting reversing valve 5 to lock the oil chamber L and the oil chamber M.

[0048] The above-mentioned structure is set up, by adding a support overflow valve 61, and utilizing the overflow volume P1 of the support overflow valve 61 to control the length of the support mechanism 93 extending downward to stop when the driving pressure of the driving cylinder reaches P1, so that the length of the support mechanism 93 driven to extend downward can be automatically adjusted with the change in the height of the frame 92 caused by the change in the load size of the material box 94. Specifically, the greater the load, the lower the height of the frame 92 and the support mechanism 93 extends downward for a shorter length before touching the ground and lifting the frame 92, and the driving pressure of the driving cylinder reaches P1; the smaller the load, the higher the height of the frame 92 and the support mechanism 93 extends downward for a longer length before touching the ground and lifting the frame 92, and the driving pressure of the driving cylinder reaches P1, thereby avoiding that the support mechanism 93 pushes up the frame 92 too much after extending downward, resulting in a significant displacement of the frame 92 under the action of the backward shift of the center of gravity of the load of the material box 94. The situation of bending and deformation of a certain degree occurs; at the same time, by adding the pressure-compensating component 7, the return oil of the oil chamber L can be pressurized into the oil chamber K through the pressure-compensating oil circuit 72, so that the support cylinder 2 can drive the support mechanism 93 to extend downward to the top between the frame 92 and the ground again, avoiding that the load of the material box 94 decreases as the unloading progresses, and the frame 92 drives the support mechanism 93 to move upward, resulting in the bottom of the support mechanism 93 not touching the ground and losing the upward push function, thereby causing the frame 92 to be compressed and deformed and the vehicle to have the risk of overturning; therefore, by setting the pressure control component 66 and the pressure-compensating component 7, the function of the support cylinder 2 driving the support mechanism 93 to extend automatically with the height of the frame 92 is added, and the deformation of the frame 92 during unloading is reduced to about 20% of the existing technology, thereby improving the unloading operation safety and vehicle life of the dump truck 9 as a whole.

[0049] In order to accurately control the real-time oil replenishment amount of the pressure-compensating oil circuit 72 to the oil chamber K, the pressure-compensating assembly 7 also includes a pressure-relief oil circuit 75 having one end connected to the pressure-compensating oil circuit 72 and the other end connected to the oil inlet end of the support overflow valve 61 through a pressure-relief one-way valve 76. The oil inlet end and the oil outlet end of the pressure-relief one-way valve 76 are respectively connected to the pressure-relief oil circuit 75 and the oil inlet end of the support overflow valve 61.

[0050] The return oil of the oil chamber L described in the pressure-compensating action of the support mechanism 93 is replenished into the oil chamber K in real time so that the support cylinder 2 drives the support mechanism 93 to extend downward again to be topped between the vehicle frame 92 and the ground. Specifically, it includes: the return oil of the oil chamber L is replenished into the oil chamber K in real time so that the support cylinder 2 drives the support mechanism 93 to extend downward again until the pressure of the pressure-compensating oil circuit 72 and the oil chamber K reaches P1, and the excess oil overflows through the pressure relief oil circuit 75 and the support overflow valve 61 in turn, so that the support mechanism 93 is topped between the vehicle frame 92 and the ground again and stops extending downward. Therefore, by adding the pressure relief oil circuit 75 connected between the pressure-compensating oil circuit 72 and the support overflow valve 61, the overflow volume P1 of the support overflow valve 61 can be used again to further control the return oil of the oil chamber L to replenish the oil chamber K in real time until the pressure reaches P1, and the excess oil is overflowed through the pressure relief oil circuit 75 and the support overflow valve 61 to accurately control the real-time oil replenishment volume of the oil chamber K by the pressure-compensating oil circuit 72, to ensure that the driving mechanism drives the support mechanism 93 to extend downward again and can be pushed up between the frame 92 and the ground again, and will not over-pushing to cause the frame 92 to be easily deformed. When unloading, the downward extension length of the support mechanism 93 can be adjusted in real time as the height of the frame 92 moves upward, to ensure the supporting effect of the support mechanism 93 and improve the adaptability of the support mechanism 93 to support the frame 92.

[0051] In order to ensure that the return oil of the oil chamber L can be smoothly replenished into the oil chamber K, the pressure control component 6 also includes a pressure control reversing valve 62 connected to the oil port P and the oil inlet end of the support overflow valve 61 through the oil port A1 and the oil port B1 respectively. The pressure control reversing valve 62 includes a left position for conducting the oil port A1 and the oil port B1, and a right position for locking the oil port B1. The set value P3 is less than P1 and P1-set value P3=0.5MPa~2MPa. Preferably, P1-set value P3=1Mpa.

[0052] The supporting action of the support mechanism 93 specifically includes: the support reversing valve 4 connects the oil port P and the oil chamber K, the oil port T and the oil chamber J so that the support cylinder 2 drives the support mechanism 93 to extend downward, and at the same time, the pressure control reversing valve 62 is in the left position. When the pressure of the oil port P and the oil chamber K reaches P1, the support overflow valve 61 opens and connects the oil port T, and the support mechanism 93 is placed between the frame 92 and the ground and stops extending downward, the support reversing valve 4 locks the oil chamber K, and the pressure control reversing valve 62 moves to the right position to lock the oil port B1 so that the pressure at the oil inlet end of the support overflow valve 61 remains between the set value P3 and P1. Therefore, by setting the pressure-controlled reversing valve 62, the oil pressure at the oil inlet end of the support overflow valve 61 is prevented from disappearing, so that the pressure relief oil circuit 75 can generate a back pressure greater than the set value P3 on the compensation oil circuit, to ensure that the return oil of the oil chamber L can be smoothly replenished to the oil chamber K in real time, so that the function of the support cylinder 2 driving the support mechanism 93 to automatically adjust the extension length with the height of the frame 92 can be stably realized.

[0053] In order to accurately control the lifting stroke of the lifting cylinder 3, the pressure-control reversing valve 62 also includes an oil port C1 and an oil port D1. The pressure-control component 6 also includes a lifting overflow valve 63 whose oil inlet and oil outlet are respectively connected to the oil port D1 and the oil port T. The overflow volume of the lifting overflow valve 63 is P2, and P2 is set to the driving pressure value of the lifting cylinder 3 after the material box 94 is flipped into place. The oil port C1 is connected to the oil port T. The right position of the pressure-control reversing valve 62 is also used to connect the oil port A1 and the oil port D1 and lock the oil port C1. The pressure-control reversing valve 62 also includes an intermediate position for locking the oil port B1 and the oil port D1 and connecting the oil port A1 and the oil port C1.

[0054] The lifting cylinder 3's in-position operation specifically includes the following steps: when the pressure in the oil port P and oil chamber M reaches P2, causing the lift relief valve 6363 to open and overflow, the lift cylinder 3 lifts the material box 94 into position, the lift reversing valve 5 locks the oil chambers L and M, the lift cylinder 3 stops lifting, and the pressure control reversing valve 62 moves to the intermediate position. Consequently, through the configuration of the lift relief valve 6363, when the driving pressure of the lift cylinder 3 reaches P2, the oil inlet at the oil port P overflows through the lift relief valve 6363 and returns to the oil port T, thereby ensuring that the lift cylinder 3 stops after lifting the material box 94 to its in-position position. This eliminates the need for an external position sensor or other device to detect the flipping position of the material box 94, saving costs while improving the accuracy and safety of the lift mechanism's positioning compared to sensor-based positioning. This prevents detection failures that could lead to the control system making erroneous judgments and issuing incorrect commands.

[0055] Specifically, the pressure-compensating reversing valve 74 includes oil ports E, F, and G, which are respectively connected to the lifting reversing valve 5, the oil chamber L, and the pressure-compensating oil circuit 72. The pressure-compensating reversing valve 74 includes a left position for connecting the oil ports E and F and locking the oil port G, and a right position for connecting the oil ports F and G and locking the oil port E.

[0056] In this embodiment, the oil chamber J is a small chamber, and the oil chamber K is a large chamber. In other embodiments, the oil chamber J and the oil chamber K may also be large chambers. The support reversing valve 4 includes oil port A2, oil port C2, oil port B2, and oil port D2 respectively connected to the oil port P, oil port T, oil chamber K, and oil chamber J. The support reversing valve 4 includes a left workstation for conducting the oil port A2 and oil port B2, oil port C2 and oil port D2, and a right workstation for conducting the oil port A2 and oil port D2, oil port C2 and oil port B2, and an intermediate workstation for locking the oil port A2 and oil port B2, and conducting the oil port C2 and D2. A one-way hydraulic lock 8 is connected between the oil port D2 and the oil chamber J, and the oil inlet end of the one-way hydraulic lock 8 is connected between the oil port B2 and the oil chamber K through a valve opening oil circuit 81.

[0057] During the pressure-compensating operation of the support mechanism 93, the support reversing valve 4 is in the intermediate position, and the excess oil in the oil chamber J is returned to the oil port T. Specifically, after the oil pressure in the pressure-compensating oil circuit 72 increases to the point where the one-way hydraulic lock 8 is opened via the valve-opening oil circuit 81, the excess oil in the oil chamber J is returned to the oil port T via the oil ports D2 and C2 in sequence. Thus, by adding the one-way hydraulic lock 8 and designing the intermediate position of the support reversing valve 4, the oil chambers K and L can be stably pressure-maintained by locking the oil port B2 and the one-way hydraulic lock 8. At the same time, after the oil chamber K is replenished to a certain level via the pressure-compensating oil circuit 72, the one-way hydraulic lock 8 can be opened via the valve-opening oil circuit 81 to return the excess oil in the oil chamber K. This further ensures that the function of the support cylinder 2 driving the support mechanism 93 to automatically adjust its extension length in accordance with the height of the vehicle frame 92 is stably achieved.

[0058] In this embodiment, the oil chamber L is a small chamber, and the oil chamber M is a large chamber. In other embodiments, the oil chamber L and the oil chamber M may also be large chambers. The lifting reversing valve 5 includes oil port A3, oil port C3, oil port B3, and oil port D3 respectively connected to the oil port P, oil port T, oil chamber M, and oil port E. The lifting reversing valve 5 includes a left workstation for conducting the oil port A3 and oil port B3, oil port C3 and oil port D3, and a right workstation for conducting the oil port A3 and oil port D3, oil port C3 and oil port B3, and an intermediate workstation for locking the oil port A3, oil port C3, oil port B3, and oil port D3.

[0059] In another embodiment, a dump truck 9 is also provided, comprising the hydraulic control system as described above, as well as a vehicle chassis 91, a vehicle frame 92, a support mechanism 93, a material box 94, and a plurality of leaf springs 95;

[0060] The vehicle frame 92 is located above the vehicle chassis 91 and is connected to the vehicle chassis 91 via a plurality of leaf springs 95;

[0061] The support mechanism 93 and the support cylinder 2 are arranged together at the rear of the frame 92, and the support cylinder 2 is used to drive the support mechanism 93 to extend downward or retract upward;

[0062] The material box 94 is arranged on the frame 92 and the rear part is hinged to the frame 92. The two ends of the lifting cylinder 3 are respectively hinged to the rear part of the frame 92 and the bottom of the material box 94 and are used to lift the material box 94 and flip it.

[0063] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A dump truck hydraulic system, characterized in that: include: Oil source (1), including oil port P and oil port T; A supporting oil cylinder (2) includes an oil chamber J and an oil chamber K. The supporting oil cylinder (2) is used to drive a supporting mechanism (93) of a corresponding dump truck (9) to extend downward to support the ground or to retract upward to reset; A lifting oil cylinder (3) comprising an oil chamber L and an oil chamber M, wherein the lifting oil cylinder (3) is used to drive a material box (94) of a corresponding dump truck (9) to flip and unload material; A supporting reversing valve (4) is connected to the oil port P, the oil port T, the oil chamber J, and the oil chamber K respectively; A lifting reversing valve (5) is connected to the oil port P, the oil port T, and the oil chamber M respectively; A pressure control assembly (6) includes a support overflow valve (61) whose oil inlet and oil outlet are respectively connected to the oil port P and the oil port T, and the overflow amount of the support overflow valve (61) is P1; The pressure compensation component (7) comprises a pressure detection device (71) for detecting the pressure of the oil chamber K, a pressure compensation oil circuit (72) connected to the oil chamber K via a pressure compensation one-way valve (73), and a pressure compensation reversing valve (74) respectively connected to the oil chamber L, the lifting reversing valve (5), and the pressure compensation oil circuit (72); when the pressure detection device (71) detects that the pressure of the oil chamber K is less than a set value P3, the pressure compensation reversing valve (74) conducts the oil chamber L and the pressure compensation oil circuit (72).

2. A dump truck hydraulic system according to claim 1, characterized in that: The pressure-compensating assembly (7) further comprises a pressure-relief oil circuit (75) having one end connected to the pressure-compensating oil circuit (72) and the other end connected to the oil inlet end of the support overflow valve (61) via a pressure-relief one-way valve (76).

3. A dump truck hydraulic system according to claim 1, characterized in that: The pressure control assembly (6) further includes a pressure control reversing valve (62) connected to the oil port P and the oil inlet end of the support relief valve (61) through the oil port A1 and the oil port B1 respectively. The pressure control reversing valve (62) includes a left position for conducting the oil port A1 and the oil port B1, and a right position for locking the oil port B1. The set value P3 is less than P1, and P1-set value P3=0.5MPa~2MPa.

4. A dump truck hydraulic system according to claim 3, characterized in that: The pressure control reversing valve (62) further includes an oil port C1 and an oil port D1. The pressure control assembly (6) further includes a lifting overflow valve (63) whose oil inlet and oil outlet are respectively connected to the oil port D1 and the oil port T. The overflow volume of the lifting overflow valve (63) is P2. The oil port C1 is connected to the oil port T. The right position of the pressure control reversing valve (62) is also used to conduct the oil port A1 and the oil port D1 and lock the oil port C1. The pressure control reversing valve (62) also includes an intermediate position for locking the oil port B1 and the oil port D1 and conducting the oil port A1 and the oil port C1.

5. A dump truck hydraulic system according to claim 1, characterized in that: The pressure-compensating reversing valve (74) includes an oil port E, an oil port F, and an oil port G respectively connected to the lifting reversing valve (5), the oil chamber L, and the pressure-compensating oil circuit (72). The pressure-compensating reversing valve (74) includes a left position for conducting the oil port E and the oil port F and locking the oil port G, and a right position for conducting the oil port F and the oil port G and locking the oil port E.

6. A dump truck hydraulic system according to claim 1, characterized in that: The oil chamber J is a small chamber, and the oil chamber K is a large chamber. The support reversing valve (4) includes an oil port A2, an oil port C2, an oil port B2, and an oil port D2 respectively connected to the oil port P, the oil port T, the oil chamber K, and the oil chamber J. The support reversing valve (4) includes a left position for conducting the oil port A2 and the oil port B2, the oil port C2 and the oil port D2, and a right position for conducting the oil port A2 and the oil port D2, the oil port C2 and the oil port B2, and an intermediate position for locking the oil port A2 and the oil port B2, and conducting the oil port C2 and the oil port D2. A one-way hydraulic lock (8) is connected between the oil port D2 and the oil chamber J, and the oil inlet end of the one-way hydraulic lock (8) is connected between the oil port B2 and the oil chamber K through a valve opening oil circuit (81).

7. A dump truck hydraulic system according to claim 5, characterized in that: The oil chamber L is a small chamber, the oil chamber M is a large chamber, the lifting reversing valve (5) includes an oil port A3, an oil port C3, an oil port B3, and an oil port D3 respectively connected to the oil port P, the oil port T, the oil chamber M, and the oil port E, the lifting reversing valve (5) includes a left position for conducting the oil port A3 and the oil port B3, the oil port C3 and the oil port D3, a right position for conducting the oil port A3 and the oil port D3, the oil port C3 and the oil port B3, and an intermediate position for locking the oil port A3, the oil port C3, the oil port B3, and the oil port D3.

8. A dump truck, characterized in that: Comprising the hydraulic system according to any one of claims 1 to 7, as well as a vehicle chassis (91), a vehicle frame (92), a support mechanism (93), a material box (94), and a plurality of leaf springs (95); The vehicle frame (92) is located above the vehicle chassis (91) and is connected to the vehicle chassis (91) via a plurality of leaf springs (95); The support mechanism (93) and the support oil cylinder (2) are arranged together at the rear of the vehicle frame (92), and the support oil cylinder (2) is used to drive the support mechanism (93) to extend downward or retract upward; The material box (94) is arranged on the vehicle frame (92) and the rear portion is hinged to the vehicle frame (92); the two ends of the lifting cylinder (3) are respectively hinged to the rear portion of the vehicle frame (92) and the bottom of the material box (94) and are used to lift the material box (94) and flip it over.

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