Loader stabilizing module, hydraulic system and loader

Abstract

The invention discloses a loader stabilizing module, a hydraulic system and a loader.The loader stabilizing module comprises an oil port SP used for being connected with an energy accumulator; the oil port B is used for connecting a large cavity of a movable arm oil cylinder of the loader; the oil port S is used for connecting a small cavity of a movable arm oil cylinder of the loader; the first electromagnetic directional valve and the logic valve are used for balancing pressure between the energy accumulator and a large cavity of the movable arm oil cylinder before the loader stabilizing module is started; an oil port SP is respectively connected with an oil port I of the electromagnetic directional valve I, an oil port I of the logic valve and an oil port I of the electromagnetic directional valve II; an oil port III of the electromagnetic directional valve I is connected with a control end of a logic valve; a spring cavity of the logic valve is connected with an oil port B; an oil port II of the electromagnetic directional valve II is connected with the oil port B; and an oil port II of the electromagnetic directional valve III is connected with the oil port S. The settlement amount of the movable arm cannot be affected, and the problem that the movable arm is suddenly lifted and shaken due to the fact that the pressure of a large cavity of the movable arm is inconsistent with the pressure between the energy accumulators at the moment of opening can be solved.

Description

Technical Field

[0001] The invention belongs to the technical field of loaders, and in particular relates to a loader stabilizing module, a hydraulic system and a loader. Background Art

[0002] As a construction machinery for shoveling and transporting, loaders often experience bumps and spills due to uneven road conditions during transport, which further leads to a poor driver experience. Therefore, during transportation, drivers further reduce vehicle speed for comfort and to reduce spills, which has the disadvantage of reducing the overall machine efficiency.

[0003] Small loaders usually use a stabilization module to solve this kind of transfer bumps. The basic principle is to use the hydraulic spring of the accumulator to absorb the vibration of the working device of the loader during driving, so that the small loader can travel quickly and smoothly.

[0004] Small loading machinery usually has a small working flow, and the specifications of the cylinder and accumulator are small. At the same time, the space of the whole machine is relatively compact. The principles of the existing stabilization module system are relatively simple, which is realized by electromagnetic reversing valves, adjustable flow valves and accumulators; but there are the following problems: 1. After the opening of the adjustable flow valve is reduced, the stabilization module is opened at the moment, due to the continuous filling of the accumulator, the pressure will instantly be higher than the pressure of the large cavity of the boom, causing the boom to suddenly lift up, affecting safety and comfort; 2. After the opening of the adjustable flow valve is reduced, the large cavity of the boom is connected to the accumulator to release pressure, causing the boom to sink more. Summary of the invention

[0005] In order to solve the deficiencies in the prior art, the present invention provides a loader stabilization module, a hydraulic system and a loader, which will not affect the amount of boom settlement and can also avoid the problem of sudden lifting and shaking of the boom due to the inconsistency between the pressure in the boom large chamber and the pressure in the accumulator at the moment of opening.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: In the first aspect, a loader stabilization module is provided, including: an oil port SP for connecting an accumulator; an oil port B for connecting to a large chamber of a loader boom cylinder; an oil port S for connecting to a small chamber of a loader boom cylinder; an electromagnetic reversing valve 1 and a logic valve for balancing the pressure between the accumulator and the large chamber of the boom cylinder before the loader stabilization module is opened; the oil port SP is respectively connected to the oil port 1 of the electromagnetic reversing valve 1, the oil port 1 of the logic valve, and the oil port 1 of the electromagnetic reversing valve 2; the oil port 2 of the electromagnetic reversing valve 1, the oil port 2 of the logic valve, and the oil port 1 of the electromagnetic reversing valve 3 are respectively connected to the oil return port T; the oil port 3 of the electromagnetic reversing valve 1 is connected to the control end of the logic valve, and the spring chamber of the logic valve is connected to the oil port B; the oil port 2 of the electromagnetic reversing valve 2 is connected to the oil port B; the oil port 2 of the electromagnetic reversing valve 3 is connected to the oil port S.

[0007] Furthermore, when the electromagnet A1 of the electromagnetic reversing valve one, the electromagnet A2 of the electromagnetic reversing valve two and the electromagnet A3 of the electromagnetic reversing valve three are all de-energized, the hydraulic oil in the large chamber of the loader's boom cylinder fills the accumulator, and the hydraulic oil in the accumulator is cut off; the hydraulic oil in the small chamber of the loader's boom cylinder is cut off by the electromagnetic reversing valve three; the loader's stabilization module is in a rigid state.

[0008] Furthermore, when the electromagnet A1 of the electromagnetic reversing valve one is energized, the electromagnet A2 of the electromagnetic reversing valve two and the electromagnet A3 of the electromagnetic reversing valve three are not energized, and the filling pressure of the accumulator is greater than the sum of the pressure of the large chamber of the loader boom cylinder and the spring force of the logic valve spring chamber, the logic valve switches to the connecting position, the accumulator is connected to the oil return port T through the logic valve, and the accumulator is depressurized until the filling pressure of the accumulator is less than the sum of the pressure of the large chamber of the loader boom cylinder and the spring force of the logic valve spring chamber, the logic valve switches to the cut-off position, and the accumulator stops depressurizing.

[0009] Furthermore, when the accumulator stops releasing pressure, the electromagnet A2 of the electromagnetic reversing valve 2 and the electromagnet A3 of the electromagnetic reversing valve 3 are energized at the same time, the large chamber of the loader boom cylinder is connected to the accumulator, the small chamber of the loader boom cylinder is connected to the oil return port T, the loader stabilization module is in a flexible state, and the accumulator acts as a hydraulic spring.

[0010] Furthermore, a relief valve is included, wherein the inlet of the relief valve is connected to the oil port SP, and the outlet of the relief valve is connected to the oil return port T.

[0011] In a second aspect, a loader hydraulic system is provided, wherein the loader hydraulic system is equipped with the loader stabilization module described in the first aspect.

[0012] Furthermore, the loader hydraulic system includes an accumulator, which is connected to the oil port SP of the loader stabilization module 20; the outlet of the working pump is connected to the inlet of the boom reversing valve, and the working oil port of the boom reversing valve is respectively connected to the oil port B, oil port S and the large chamber and small chamber of the boom cylinder of the loader stabilization module.

[0013] Furthermore, it also includes a main overflow valve, the inlet of the main overflow valve is connected to the outlet of the working pump, and the outlet of the main overflow valve is connected to the hydraulic oil tank.

[0014] According to a third aspect, a loader is provided, wherein the loader is equipped with the loader hydraulic system according to the second aspect.

[0015] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention balances the pressure between the large chamber of the boom cylinder and the accumulator through the electromagnetic reversing valve 1 and the logic valve at the moment of opening the stabilizing module when the pressure of the large chamber of the boom cylinder changes, thereby avoiding the inconsistency between the pressure of the large chamber of the boom cylinder and the pressure of the accumulator at the moment of opening, which causes the actuator to shake suddenly and affects safety and comfort; (2) The present invention can avoid the problem of increased boom settlement due to the large boom cavity being connected to the accumulator for pressure relief by using the electromagnetic reversing valve 1 and the logic valve; (3) The present invention does not change the control method of the original stabilization module, but adopts electronic control, which can select the triggering of the rigid or flexible state of the stabilization module according to different working conditions, so that the whole system can operate stably under multiple working conditions without jitter; (4) Considering the limited assembly space of small loading machinery, the loader stabilization module disclosed in the present invention uses plug-in components to meet the working flow requirements of the whole machine while greatly reducing the volume of components, with a high degree of integration, small space occupation, and more flexible layout; (5) Compared with the prior art, the accumulator will not be frequently filled and discharged as the boom cylinder is extended and retracted, which can greatly increase the service life of the accumulator. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the principle of a loader stabilization module provided by an embodiment of the present invention; Figure 2 It is a schematic diagram of the principle of a loader hydraulic system provided by an embodiment of the present invention; In the figure: 20, loader stabilization module; 1, solenoid reversing valve 1; 2, solenoid reversing valve 2; 3, solenoid reversing valve 3; 4, logic valve; 5, overflow valve; 6, accumulator; 7, boom cylinder; 8, boom reversing valve; 9, working pump; 10, main overflow valve; 11, hydraulic oil tank. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0018] Embodiment 1 like Figure 1As shown, a loader stabilization module includes: an oil port SP for connecting an accumulator; an oil port B for connecting a large chamber of the loader boom cylinder; an oil port S for connecting a small chamber of the loader boom cylinder; an electromagnetic reversing valve 1 and a logic valve 4 for balancing the pressure between the accumulator and the large chamber of the boom cylinder before the loader stabilization module is opened; the oil port SP is respectively connected to the oil port 1 of the electromagnetic reversing valve 1, the oil port 1 of the logic valve 4, and the oil port 1 of the electromagnetic reversing valve 2; the oil port 2 of the electromagnetic reversing valve 1, the oil port 2 of the logic valve 4, and the oil port 1 of the electromagnetic reversing valve 3 are respectively connected to the oil return port T; the oil port 3 of the electromagnetic reversing valve 1 is connected to the control end of the logic valve 4, and the spring chamber of the logic valve 4 is connected to the oil port B; the oil port 2 of the electromagnetic reversing valve 2 is connected to the oil port B; the oil port 2 of the electromagnetic reversing valve 3 is connected to the oil port S.

[0019] In the present invention, the electromagnetic reversing valve 1 is a two-position three-way valve, the electromagnetic reversing valve 2 and the electromagnetic reversing valve 3 are two-position two-way electromagnetic reversing valves, and the logic valve 4 is a two-position two-way hydraulically controlled logic valve.

[0020] A spring is provided at the left end of the electromagnetic reversing valve 1, which is connected to the oil return port T, and an electromagnet A1 is provided at the right end of the electromagnetic reversing valve 1; the electromagnetic reversing valve 1 is provided with a left position and a right position. When the electromagnet A1 of the electromagnetic reversing valve 1 is not energized, the electromagnetic reversing valve 1 works in the left position. At this time, the accumulator oil is cut off at the oil port 1 of the electromagnetic reversing valve 1, and the right end of the logic valve 4 is connected to the oil port 2 of the electromagnetic reversing valve 1 through the oil port 3 of the electromagnetic reversing valve 1, and then connected to the oil return port T; when the electromagnet A1 of the electromagnetic reversing valve 1 is energized, the electromagnetic reversing valve 1 works in the right position. At this time, the oil return port T is cut off at the oil port 2 of the electromagnetic reversing valve 1, and the accumulator oil is connected to the oil port 3 of the electromagnetic reversing valve 1 through the oil port 1 of the electromagnetic reversing valve 1, and then connected to the right end (control end) of the logic valve 4.

[0021] An electromagnet A2 is provided at the left end of the electromagnetic reversing valve 2, and a spring is provided at the right end of the electromagnetic reversing valve 2, which is connected to the oil return port T; the electromagnetic reversing valve 2 is provided with a left position and a right position. When the electromagnet A2 of the electromagnetic reversing valve 2 is not energized, the electromagnetic reversing valve 2 works in the right position. At this time, the large chamber of the boom cylinder is connected to the accumulator through the oil port B, the oil port 2 of the electromagnetic reversing valve 2, and then through the one-way valve joint (right position) of the electromagnetic reversing valve 2, the oil port 1 of the electromagnetic reversing valve 2, and the oil port SP. Furthermore, when the electromagnetic reversing valve 2 works in the right position, the large chamber of the boom cylinder can be connected to the accumulator through the one-way valve of the electromagnetic reversing valve 2, while the oil in the accumulator is cut off at the one-way valve of the electromagnetic reversing valve 2; when the electromagnet A2 of the electromagnetic reversing valve 2 is energized, the electromagnetic reversing valve 2 works in the left position. At this time, the large chamber of the boom cylinder is directly connected to the accumulator through the oil port B, the oil port 2 of the electromagnetic reversing valve 2, the oil port 1 of the electromagnetic reversing valve 2, and the oil port SP, and the oil in the accumulator can be directly connected to the large chamber of the boom cylinder.

[0022] The left end of the electromagnetic reversing valve 33 is provided with an electromagnet A3, and the right end of the electromagnetic reversing valve 33 is provided with a spring, which is connected to the oil return port T; the electromagnetic reversing valve 33 is provided with a left position and a right position. When the electromagnet A3 of the electromagnetic reversing valve 3 is not energized, the electromagnetic reversing valve 33 works in the right position. At this time, the small chamber of the boom oil cylinder is connected to the oil return port T through the oil port S, the oil port 2 of the electromagnetic reversing valve 33, the one-way valve joint of the electromagnetic reversing valve 33 (right position), and the oil port 1 of the electromagnetic reversing valve 33. Further, when the electromagnetic reversing valve 33 works in the right position, the oil in the small chamber of the boom oil cylinder is cut off through the one-way valve joint of the electromagnetic reversing valve 33; when the electromagnet A3 of the electromagnetic reversing valve 3 is energized, the electromagnetic reversing valve 33 works in the left position. At this time, the oil port of the small chamber of the boom oil cylinder is directly connected to the oil return port T through the oil port 2 of the electromagnetic reversing valve 33 and the oil port 1 of the electromagnetic reversing valve 33.

[0023] The logic valve 4 is provided with a left position and a right position. When the control oil pressure at the right end of the logic valve 4 is less than the sum of the control oil pressure at the left end (the pressure of the large chamber of the boom cylinder) and the spring force at the left end, the logic valve 4 works in the left position, and the accumulator oil is cut off at the logic valve 4; when the control oil pressure at the right end of the logic valve 4 is greater than the sum of the control oil pressure at the left end and the spring force at the left end, the logic valve 4 works in the right position, and the accumulator oil is connected through the logic valve 4 and then connected to the oil return port T.

[0024] When the electromagnet A1 of the electromagnetic reversing valve 1, the electromagnet A2 of the electromagnetic reversing valve 2 and the electromagnet A3 of the electromagnetic reversing valve 3 are all de-energized, the hydraulic oil in the large chamber of the loader boom cylinder charges the accumulator, and the hydraulic oil in the accumulator is cut off; the hydraulic oil in the small chamber of the loader boom cylinder is cut off by the electromagnetic reversing valve 3; the loader stabilization module is in a rigid state and will not play the role of reducing the vibration of the working boom during the driving process of the whole machine. At the same time, since the accumulator oil is cut off, it can be ensured that the settlement of the boom will not be affected.

[0025] When the electromagnet A1 of the electromagnetic reversing valve 1 is energized, the electromagnet A2 of the electromagnetic reversing valve 2 and the electromagnet A3 of the electromagnetic reversing valve 3 are both de-energized, and the filling pressure of the accumulator is greater than the sum of the pressure of the large chamber of the loader boom cylinder and the spring force of the logic valve spring chamber, the logic valve 4 switches to the connecting position, and the accumulator is connected to the return oil port T through the logic valve 4, and the accumulator is depressurized until the filling pressure of the accumulator is less than the sum of the pressure of the large chamber of the loader boom cylinder and the spring force of the logic valve spring chamber. The logic valve 4 switches to the cut-off position, the accumulator oil is cut off, and the accumulator stops depressurizing, thereby achieving a balance between the accumulator pressure and the boom large chamber pressure, avoiding the problem of instantaneous boom jumping due to the large difference between the accumulator pressure and the boom large chamber pressure when the stabilization module function is turned on.

[0026] When the accumulator stops releasing pressure, the electromagnet A2 of the electromagnetic reversing valve 2 and the electromagnet A3 of the electromagnetic reversing valve 3 are energized at the same time, the large chamber of the loader boom cylinder is connected with the accumulator, the small chamber of the loader boom cylinder is connected with the oil return port T, the loader stabilization module is in a flexible state, and the accumulator acts as a hydraulic spring, which plays a role of vibration reduction and buffering when the whole machine is driving, thereby improving the comfort of transportation.

[0027] The present invention realizes that when the stabilizing module is turned on, the pressure of the large cavity of the boom and the pressure of the accumulator are balanced first, and then the stabilizing module is in a flexible state, so that the accumulator is prevented from being charged and discharged in real time, thereby increasing the service life of the accumulator.

[0028] The present invention realizes pressure balance through a two-position three-way electromagnetic reversing valve and a two-position two-way logic valve. When the stabilization module is to be turned on, the oil circuit is first switched to balance the pressure of the accumulator and the large chamber of the boom, and then the two two-position two-way electromagnetic reversing valves are controlled to switch, so that the large chamber of the boom and the accumulator are connected, and the small chamber of the boom returns oil to perform walking damping, which will not affect the settlement amount of the boom and can also avoid the inconsistency between the pressure of the rodless chamber and the pressure of the accumulator at the moment of opening, which will cause the boom to suddenly lift up and shake, affecting comfort.

[0029] Embodiment 2 The difference between this embodiment and the first embodiment is that a relief valve 5 is further provided in this embodiment, the inlet of the relief valve 5 is connected to the oil port SP, and the outlet of the relief valve 5 is connected to the oil return port T. The first embodiment is applicable to a loader hydraulic system in which an overload valve is provided in the large-cavity oil circuit of the boom oil cylinder, while this embodiment is applicable to a loader hydraulic system in which no overload valve is provided in the large-cavity oil circuit of the boom oil cylinder.

[0030] The accumulator is connected to the oil return port T through the relief valve 5. The inlet of the relief valve 5 is connected to the accumulator, and the outlet of the relief valve 5 is connected to the oil return port T. When the pressure of the accumulator 6 is too high, the excess pressure can be released to avoid the equipment from being subjected to high pressure and extend the life of the equipment.

[0031] Embodiment 3 Based on the loader stabilization module described in the first and second embodiments, this embodiment provides a loader hydraulic system, and the loader hydraulic system is equipped with the loader stabilization module described in the first or second embodiment.

[0032] like Figure 2 As shown, in addition to the loader stabilization module 20 described in the first embodiment, it also includes an accumulator 6, a boom cylinder 7, a boom reversing valve 8, a working pump 9, a main overflow valve 10 and a hydraulic oil tank 11.

[0033] The working pump 9 is a gear pump, and the outlet of the working pump 9 is connected to the inlet of the main relief valve 10, and is connected to the inlet P of the boom reversing valve 8; the working oil port b of the boom reversing valve 8 is connected to the large chamber of the boom cylinder 7, and is connected to the oil port B of the loader stabilization module 20, the working oil port a of the boom reversing valve 8 is connected to the small chamber of the boom cylinder 7, and is connected to the oil port S of the loader stabilization module 20; the oil port SP of the loader stabilization module 20 is connected to the accumulator 6; the return oil port T of the loader stabilization module 20, the return oil port T1 of the boom reversing valve 8, the return oil port of the main relief valve 10, and the oil suction port of the working pump 9 are all connected to the hydraulic oil tank 11.

[0034] The loader performs shoveling, stacking and other working operations. By operating the boom reversing valve 8 to switch left and right, the piston rod of the boom cylinder 7 can be controlled to extend and retract, thereby controlling the lifting and lowering of the working device of the loader.

[0035] When the stabilization module function does not need to be turned on, the electromagnet A1 of the electromagnetic reversing valve 1, the electromagnet A2 of the electromagnetic reversing valve 2 and the electromagnet A3 of the electromagnetic reversing valve 3 shall not be energized. At this time, the electromagnetic reversing valve 1 works in the left position, the electromagnetic reversing valve 2 works in the right position, and the electromagnetic reversing valve 3 works in the right position. At this time, the right end of the logic valve 4 is connected with the oil port 3 through the oil port 2 of the electromagnetic reversing valve 1, and then connected with the return oil port T. The logic valve 4 works in the left position; further, the boom cylinder The accumulator 6 is filled with the oil in the large chamber 7, and the oil in the accumulator 6 is cut off at the oil port 1 of the electromagnetic reversing valve 1, the one-way valve joint in the electromagnetic reversing valve 2, and the oil port of the logic valve 4, while the oil in the small chamber of the boom cylinder 7 is cut off at the one-way valve joint in the electromagnetic reversing valve 3, so that the loader stabilization module 20 is in a rigid state and will not play the function of reducing the vibration of the working boom during the driving process of the whole machine. At the same time, since the accumulator oil is cut off, it can be ensured that the settlement of the boom will not be affected.

[0036] When the stabilization module function needs to be turned on, the electromagnet A1 of the electromagnetic reversing valve 1 needs to be energized first. After a period of time (i.e., after the oil pressure in the accumulator 6 and the large chamber of the boom cylinder 7 is balanced), the electromagnet A2 of the electromagnetic reversing valve 2 and the electromagnet A3 of the electromagnetic reversing valve 3 are energized at the same time.

[0037] When the electromagnet A1 of the electromagnetic reversing valve 1 is energized, while the electromagnet A2 of the electromagnetic reversing valve 2 and the electromagnet A3 of the electromagnetic reversing valve 3 are not energized, the electromagnetic reversing valve 1 works in the right position, the electromagnetic reversing valve 2 works in the right position, the electromagnetic reversing valve 3 works in the right position, and the right end of the logic valve 4 is connected with the oil port 1 through the oil port 3 of the electromagnetic reversing valve 1, and then connected with the accumulator 6 through the oil port SP; when the filling pressure of the accumulator 6 is greater than the sum of the pressure of the large chamber of the boom cylinder 7 and the spring force at the left end of the logic valve 4 , the logic valve 4 works in the right position, the oil in the accumulator 6 is connected to the oil return port T through the logic valve 4, and the accumulator 6 is depressurized until the filling pressure of the accumulator 6 is less than the sum of the large chamber pressure of the boom cylinder and the spring force at the left end of the logic valve 4. The logic valve 4 works in the left position, and the oil in the accumulator 6 is cut off, thereby achieving a balance between the accumulator pressure and the large chamber pressure of the boom, avoiding the problem of instantaneous boom jumping due to the large difference between the accumulator pressure and the large chamber pressure of the boom when the stabilization module function is turned on.

[0038] When the electromagnet A1 of the electromagnetic reversing valve 1 is kept energized, after a period of time (that is, after the oil pressure of the large chamber of the accumulator 6 and the boom cylinder 7 is balanced), the electromagnet A2 of the electromagnetic reversing valve 2 and the electromagnet A3 of the electromagnetic reversing valve 3 are energized at the same time, the electromagnetic reversing valve 1 works in the right position, the electromagnetic reversing valve 2 works in the left position, and the electromagnetic reversing valve 3 works in the left position. At this time, the right end of the logic valve 4 is connected to the electromagnetic reversing valve 4 through the oil port 3 and the oil port 1 of the electromagnetic reversing valve 1, and the oil port 1 and the oil port 2 of the electromagnetic reversing valve 2. The large chamber of the boom cylinder is connected, and the logic valve 4 works in the left position under the action of the spring force; the oil in the large chamber of the boom cylinder 7 is connected to the accumulator 6 through the electromagnetic reversing valve 2, and the oil in the accumulator 6 is cut off at the oil port of the logic valve 4, and the oil in the small chamber of the boom cylinder 7 is connected to the return oil port T through the electromagnetic reversing valve 3, so that the loader stabilization module 20 is in a flexible state, and the accumulator 6 acts as a hydraulic spring, which plays a role of vibration reduction and buffering when the whole machine is traveling, thereby improving the transportation driving comfort.

[0039] In summary, the present invention balances the pressure between the large chamber of the boom cylinder and the accumulator through the electromagnetic reversing valve 1 and the logic valve at the moment of opening of the stabilizing module when the pressure in the large chamber of the boom cylinder changes; avoids the inconsistency between the pressure in the large chamber of the boom cylinder and the pressure in the accumulator at the moment of opening, which causes the actuator to shake suddenly and affects the safety and comfort; and through the electromagnetic reversing valve 1 and the logic valve, it can avoid the large chamber of the boom cylinder connecting to the accumulator to release pressure, which causes the boom to sink more.

[0040] At the same time, the present invention does not change the control method of the original stabilization module, but adopts electronic control. It can select the rigid or flexible state of the triggering stabilization module according to different working conditions, so that the whole system can operate stably in multiple working conditions without jitter. Considering the limited assembly space of small loading machinery, the loader stabilization module of the present invention uses plug-in components to meet the working flow requirements of the whole machine while greatly reducing the size of the components, with a high degree of integration, small space occupation and more flexible layout. Compared with the prior art, the accumulator will not be frequently filled and discharged with the extension and retraction of the boom cylinder, which can greatly improve the service life of the accumulator.

[0041] Embodiment 4 Based on Embodiment 1 to Embodiment 3, this embodiment provides a loader, which is configured with the loader stabilization module described in any one of Embodiment 1 to Embodiment 2 or the loader hydraulic system described in Embodiment 3.

[0042] 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 modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A loader stabilization module, characterized in that: include: Oil port SP for connecting the accumulator; Used to connect the oil port B of the large chamber of the loader boom cylinder; Oil port S for connecting the small chamber of the loader boom cylinder; A solenoid reversing valve (1) and a logic valve (4) for balancing the pressure between the accumulator and the large chamber of the boom cylinder before the loader stabilization module is opened; The oil port SP is respectively connected to the oil port 1 of the electromagnetic reversing valve 1 (1), the oil port 1 of the logic valve (4), and the oil port 1 of the electromagnetic reversing valve 2 (2); The oil port 2 of the electromagnetic reversing valve 1 (1), the oil port 2 of the logic valve (4), and the oil port 1 of the electromagnetic reversing valve 3 (3) are respectively connected to the oil return port T; The oil port 3 of the electromagnetic reversing valve 1 (1) is connected to the control end of the logic valve (4), and the spring chamber of the logic valve (4) is connected to the oil port B; The oil port 2 of the electromagnetic reversing valve 2 (2) is connected to the oil port B; the oil port 2 of the electromagnetic reversing valve 3 (3) is connected to the oil port S.

2. The loader stabilization module according to claim 1, characterized in that: When the electromagnet A1 of the electromagnetic reversing valve 1, the electromagnet A2 of the electromagnetic reversing valve 2 and the electromagnet A3 of the electromagnetic reversing valve 3 are all de-energized, the hydraulic oil in the large chamber of the loader boom cylinder fills the accumulator, and the hydraulic oil in the accumulator is cut off; the hydraulic oil in the small chamber of the loader boom cylinder is cut off by the electromagnetic reversing valve 3 (3); and the loader stabilization module is in a rigid state.

3. The loader stabilization module according to claim 2, characterized in that: When the solenoid A1 of the solenoid reversing valve 1 is energized, the solenoid A2 of the solenoid reversing valve 2 and the solenoid A3 of the solenoid reversing valve 3 are both de-energized, and the filling pressure of the accumulator is greater than the sum of the pressure of the large chamber of the loader boom oil cylinder and the spring force of the logic valve spring chamber, the logic valve (4) switches to the connecting position, the accumulator is connected to the oil return port T through the logic valve (4), and the accumulator is depressurized until the filling pressure of the accumulator is less than the sum of the pressure of the large chamber of the loader boom oil cylinder and the spring force of the logic valve spring chamber, and the logic valve (4) switches to the cut-off position, and the accumulator stops depressurizing.

4. The loader stabilizing module according to claim 3, characterized in that: When the accumulator stops relieving pressure, the electromagnet A2 of the electromagnetic reversing valve 2 and the electromagnet A3 of the electromagnetic reversing valve 3 are energized at the same time, the large chamber of the loader boom cylinder is connected with the accumulator, the small chamber of the loader boom cylinder is connected with the oil return port T, the loader stabilization module is in a flexible state, and the accumulator acts as a hydraulic spring.

5. The loader stabilization module according to claim 1, characterized in that: It also comprises a relief valve (5), the inlet of the relief valve (5) is connected to the oil port SP, and the outlet of the relief valve (5) is connected to the oil return port T.

6. A loader hydraulic system, characterized in that: The loader hydraulic system is equipped with a loader stabilization module according to any one of claims 1 to 5.

7. The loader hydraulic system according to claim 6, characterized in that: The loader hydraulic system comprises an accumulator (6), the accumulator (6) being connected to an oil port SP of a loader stabilization module 20; an outlet of a working pump (9) being connected to an inlet of a boom reversing valve (8), and a working oil port of the boom reversing valve (8) being respectively connected to an oil port B and an oil port S of the loader stabilization module (20) and a large chamber and a small chamber of a boom oil cylinder (7).

8. The loader hydraulic system according to claim 7, characterized in that: It also comprises a main overflow valve (10), the inlet of the main overflow valve (10) being connected to the outlet of the working pump (9), and the outlet of the main overflow valve (10) being connected to the hydraulic oil tank (11).

9. A loader, characterized in that: The loader is equipped with a loader hydraulic system according to any one of claims 6 to 8.

Images