Pressurizing oil way, hydraulic leveling system and aerial work platform
By adopting a single-sided pressurization scheme with a pressurized oil circuit in the aerial work platform, the problem of leveling lag during boom luffing was solved, the return oil back pressure was reduced and energy loss was decreased, and the versatility of the system was improved.
Patent Information
- Application Number
- CN202520490606.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-20
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2035-03-20
AI Technical Summary
In existing technologies, the leveling lag problem during boom luffing of aerial work platforms leads to increased return oil back pressure and increased system energy loss. Furthermore, it lacks versatility and cannot be applied to different types of balance valves.
A pressurized oil circuit is adopted, and the leveling circuit is pressurized on one side through a hydraulic control directional valve or a solenoid directional valve. Combined with the safety valve control, pressurization is only performed when the boom is luffing, so as to avoid the return oil back pressure from rising and reduce system energy loss.
It improves the leveling lag, avoids the increase of return oil back pressure, reduces system energy loss, and improves the system's versatility, enabling the aerial work platform to work normally in different types of balance valves.
Smart Images
Figure CN223739750U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to hydraulic leveling technical field especially relates to a pressurized oil way, hydraulic leveling system and aerial work platform. BACKGROUND
[0002] When the aerial work platform boom amplitude is up, the pressure oil passes through the electromagnetic reversing valve and enters the boom amplitude oil cylinder rodless cavity, makes the boom amplitude oil cylinder stretch out and push the boom up, and the boom pulls the lower leveling oil cylinder to stretch out, at this time, the lower leveling oil cylinder rod cavity oil pressure rises and enters the upper leveling oil cylinder rod cavity, when the lower leveling oil cylinder rod cavity oil pressure rises to the preset pilot pressure value of the upper leveling oil cylinder rodless cavity balance valve, the upper leveling oil cylinder rodless cavity balance valve opens, the upper leveling oil cylinder retracts, and the aerial work platform is always kept horizontal, but in the process of the lower leveling oil cylinder rod cavity oil pressure rising to the preset pilot pressure value of the upper leveling oil cylinder rodless cavity balance valve, the upper leveling oil cylinder is in a static state, which leads to the leveling lag of the aerial work platform in the boom amplitude process.
[0003] When the aerial work platform boom amplitude is down, the pressure oil passes through the electromagnetic reversing valve and enters the boom amplitude oil cylinder rod cavity, makes the boom amplitude oil cylinder retract and pull the boom down, and the boom pushes the lower leveling oil cylinder to retract, at this time, the lower leveling oil cylinder rodless cavity oil pressure rises and enters the upper leveling oil cylinder rodless cavity, when the lower leveling oil cylinder rodless cavity oil pressure rises to the preset pilot pressure value of the upper leveling oil cylinder rod cavity balance valve, the upper leveling oil cylinder rod cavity balance valve opens, the upper leveling oil cylinder stretches out, and the aerial work platform is always kept horizontal, but in the process of the lower leveling oil cylinder rodless cavity oil pressure rising to the preset pilot pressure value of the upper leveling oil cylinder rod cavity balance valve, the upper leveling oil cylinder is in a static state, which leads to the leveling lag of the aerial work platform in the boom amplitude process.
[0004] At present, the technical scheme for solving the leveling lag problem of the aerial work platform is usually as follows: simultaneously pressurizing the rodless cavity and the rod cavity of the leveling oil cylinder, which has the following defects:
[0005] (1) without energy saving and economy: simultaneously pressurizing the rodless cavity and the rod cavity of the leveling oil cylinder will lead to the increase of the oil return back pressure in the leveling process, and the leveling circuit is always in the pressurizing state when the main circuit works, which increases the system energy loss;
[0006] (2) without universality: simultaneously pressurizing the rodless cavity and the rod cavity of the leveling oil cylinder can only be used in the leveling circuit with the atmospheric type balance valve or the separate oil return type balance valve, if the oil return type balance valve is used, the increase of the oil return back pressure caused by simultaneously pressurizing the rodless cavity and the rod cavity of the leveling oil cylinder will lead to the failure of the normal opening of the leveling balance valve, when the leveling balance valve fails to normally open, the lag will be more serious, and the safety risk will be greater. Practical new content
[0007] The utility model discloses a kind of pressure charging oil paths, hydraulic leveling systems and aerial work platforms, to solve the problem that the rod cavity and rod cavity of leveling oil cylinder are simultaneously pressurized, and the problem that the energy loss of leveling system increases.
[0008] The utility model discloses a kind of pressure charging oil paths, for the leveling loop of the hydraulic leveling system of aerial work platform is pressurized, the pressure charging oil path includes reversing valve and safety valve, the first mouth of the reversing valve is connected with the safety valve, the second mouth of the reversing valve is connected in the rod cavity end of leveling loop, the third mouth of the reversing valve is connected in the rod cavity end of leveling loop, the safety valve is also connected in the oil inlet of the luffing loop of hydraulic leveling system.
[0009] Further, the reversing valve is hydraulic control reversing valve or electromagnetic reversing valve;
[0010] When the reversing valve is hydraulic control reversing valve, the first control mouth of the hydraulic control reversing valve is also connected in the rod cavity end of luffing loop, and the second control mouth of the hydraulic control reversing valve is also connected in the rod cavity end of luffing loop.
[0011] Further, the safety valve is pressure cut-off valve, pressure reducing valve or pressure reducing overflow valve.
[0012] Based on the same concept, the utility model also provides a kind of hydraulic leveling system, and the system includes the pressure charging oil path as described above.
[0013] Based on the same concept, the utility model also provides a kind of aerial work platform, and the platform includes the hydraulic leveling system as described above.
[0014] Beneficial effects
[0015] Compared with prior art, the utility model has the advantages that:
[0016] The pressure charging oil path of the utility model takes hydraulic oil from luffing loop to carry out one-side pressurization to leveling oil cylinder in leveling loop, when lower leveling oil cylinder extends (or upper leveling oil cylinder retracts), the rod cavity end of leveling oil cylinder is pressurized, when lower leveling oil cylinder retracts (or upper leveling oil cylinder extends), the rod cavity end of leveling oil cylinder is pressurized, leveling hysteresis problem is improved, and back pressure rise in return oil during leveling process of aerial work platform is avoided, leveling oil cylinder pressurization and arm luffing linkage are realized, so that pressure charging oil path only works when arm luffing, and system energy loss is reduced. BRIEF DESCRIPTION OF DRAWINGS
[0017] In order to more clearly illustrate the technical scheme of the utility model, the following will be needed to use the drawings in the embodiment description, obviously, the following description in the drawings is only one embodiment of the utility model, for those skilled in the art, without creative labor, other drawings can also be obtained according to these drawings.
[0018] Figure 1 It is the hydraulic leveling system principle diagram in the embodiment one of the utility model;
[0019] Figure 2 It is the hydraulic leveling system principle diagram in the embodiment two of the utility model.
[0020] The reference signs are explained: 1-amplitude circuit, 11-electromagnetic reversing valve in the amplitude circuit, 12-first two-way balance valve, 13-amplitude oil cylinder, 2-leveling circuit, 21-second two-way balance valve, 22-down leveling oil cylinder, 23-third two-way balance valve, 24-up leveling oil cylinder, 3-charge oil circuit, 31-hydraulic control reversing valve, 32-safety valve, 33-electromagnetic reversing valve in the charge oil circuit. DETAILED DESCRIPTION
[0021] The technical scheme in the utility model will be clearly and completely described below in the drawings in the embodiment of the utility model, obviously, the described embodiment is only a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.
[0022] Embodiment one
[0023] The hydraulic leveling system of the aerial work platform includes leveling circuit and amplitude circuit, in order to solve the problem that the rodless cavity and the rod cavity of the leveling oil cylinder in the leveling circuit are simultaneously charged, which leads to the increase of back pressure of oil return, and the increase of system energy loss, the utility model embodiment provides an oil circuit for unilateral charging to the leveling circuit. As shown in Figure 1 The charge oil circuit 3 of the utility model includes hydraulic control reversing valve 31 and safety valve 32, the first port of hydraulic control reversing valve 31 is connected with the first port of safety valve 32, the second port of hydraulic control reversing valve 31 is connected to the rodless cavity end of leveling circuit 2, the third port of hydraulic control reversing valve 31 is connected to the rod cavity end of leveling circuit 2, the first control port of hydraulic control reversing valve 31 is connected to the rodless cavity end of amplitude circuit 1, the second control port of hydraulic control reversing valve 31 is connected to the rod cavity end of amplitude circuit 1, and safety valve 32 is connected to the oil inlet of amplitude circuit 1.
[0024] In the specific embodiment of the utility model, as Figure 1As shown, the amplitude circuit 1 comprises an electromagnetic reversing valve 11, a first bidirectional balance valve 12 and an amplitude cylinder 13, the first port and the fourth port of the electromagnetic reversing valve 11 are connected with the boom oil circuit respectively, the second port and the third port of the electromagnetic reversing valve 11 are connected with the first port and the fourth port of the first bidirectional balance valve 12 respectively, the second port and the third port of the first bidirectional balance valve 12 are connected with the rodless cavity and the rod cavity of the amplitude cylinder 13 respectively. The oil inlet of the amplitude circuit 1 refers to the first port of the electromagnetic reversing valve 11 or the pipeline between the first port of the electromagnetic reversing valve 11 and the boom oil circuit, the rodless cavity end of the amplitude circuit 1 refers to the pipeline between the second port of the electromagnetic reversing valve 11 and the first port of the first bidirectional balance valve 12, and the rod cavity end of the amplitude circuit 1 refers to the pipeline between the third port of the electromagnetic reversing valve 11 and the fourth port of the first bidirectional balance valve 12.
[0025] In the specific embodiment of the utility model, as shown, Figure 1 As shown, the leveling circuit 2 comprises a second bidirectional balance valve 21, a third bidirectional balance valve 23, a lower leveling cylinder 22 and an upper leveling cylinder 24, the first port and the fourth port of the second bidirectional balance valve 21 are connected with the boom oil circuit respectively, the second port of the second bidirectional balance valve 21 is connected with the rodless cavity of the lower leveling cylinder 22 and the first port of the third bidirectional balance valve 23, the third port of the second bidirectional balance valve 21 is connected with the rod cavity of the lower leveling cylinder 22 and the fourth port of the third bidirectional balance valve 23, and the second port and the third port of the third bidirectional balance valve 23 are connected with the rodless cavity and the rod cavity of the upper leveling cylinder 24 respectively. The rodless cavity end of the leveling circuit 2 refers to the pipeline between the second port of the second bidirectional balance valve 21 and the rodless cavity of the lower leveling cylinder 22, and the rod cavity end of the leveling circuit 2 refers to the pipeline between the third port of the second bidirectional balance valve 21 and the rod cavity of the lower leveling cylinder 22.
[0026] The pressure charging process of the pressure charging oil circuit 3 is as follows:
[0027] When the boom amplitude of the aerial work platform is raised, the pressure charging oil circuit 3 takes control oil from the amplitude circuit 1 to the first control port of the hydraulic control reversing valve 31, so that the hydraulic control reversing valve 31 is reversed from the neutral position to the Y1 position, the hydraulic oil is depressurized to the preset pressure through the safety valve 32 from the oil outlet C of the boom oil circuit, and then is charged to the rod cavity of the lower leveling cylinder 22 through the hydraulic control reversing valve 31, so that the oil pressure of the rod cavity of the lower leveling cylinder 22 quickly reaches the preset pilot pressure of the third bidirectional balance valve 23 (i.e. the balance valve of the third bidirectional balance valve 23 corresponding to the rodless cavity of the upper leveling cylinder 24), thereby solving the problem of leveling lag; when the oil pressure of the rod cavity of the lower leveling cylinder 22 reaches the preset pilot pressure of the third bidirectional balance valve 23, the upper leveling cylinder 24 is retracted, so that the aerial work platform always remains horizontal.
[0028] When the boom of the aerial work platform is lowered, the pressure charging oil way 3 takes control oil from the luffing circuit 1 to the second control port of the hydraulic control reversing valve 31, so that the hydraulic control reversing valve 31 is reversed from the neutral position to the Y2 position, and the hydraulic oil is discharged from the oil outlet C of the boom oil way, is decompressed to the preset pressure through the safety valve 32, and then is charged to the rodless cavity of the down leveling oil cylinder 22 through the hydraulic control reversing valve 31, so that the oil pressure of the rodless cavity of the down leveling oil cylinder 22 quickly reaches the preset pilot pressure of the third double balance valve 23 (namely the balance valve of the third double balance valve 23 corresponding to the rod cavity of the up leveling oil cylinder 24), thereby solving the problem of leveling lag; when the oil pressure of the rodless cavity of the down leveling oil cylinder 22 reaches the preset pilot pressure of the third double balance valve 23, the up leveling oil cylinder 24 is extended, so that the aerial work platform is always kept horizontal.
[0029] The utility model discloses a pressure charging oil way 3 takes hydraulic oil from the luffing circuit 1 to carry out one -sided pressure charging for the leveling circuit 2, avoids the problem that the back pressure of oil return is raised in the leveling process, and then control oil is taken from the luffing circuit 1 to the hydraulic control reversing valve 31, when the boom is luffed up, the rod cavity of the leveling circuit 2 is charged, when the boom is luffed down, the rodless cavity of the leveling circuit 2 is charged, realizes the pressure charging of the leveling circuit 2 and boom luffing linkage, and the pressure charging oil way 3 only works when the boom is luffed, reduces system energy loss.
[0030] In the specific embodiment of the utility model, the safety valve 32 is a pressure cut-off valve, a pressure reducing valve or a pressure reducing overflow valve, which avoids the problem that the pressure of the overflow caused by the traditional pressure charging oil way 3 being an overflow valve affects the luffing pressure.
[0031] When the safety valve 32 is a pressure cut-off valve or a pressure reducing valve, the second port of the pressure cut-off valve or the pressure reducing valve is connected to the oil inlet of the luffing circuit 1 (namely the pipeline between the first port of the electromagnetic reversing valve 11 and the boom oil way), as shown in Figure 1 When the safety valve 32 is a pressure reducing overflow valve, the second port of the pressure reducing overflow valve is connected to the oil inlet of the luffing circuit 1 (namely the pipeline between the first port of the electromagnetic reversing valve 11 and the boom oil way), and the third port of the pressure reducing overflow valve is connected to the pipeline between the fourth port of the electromagnetic reversing valve 11 and the boom oil way, as shown in Figure 2 .
[0032] Example Two
[0033] As shown in Figure 2 The utility model discloses a pressure charging oil way 3 includes electromagnetic reversing valve 33 and safety valve 32, and the first port of electromagnetic reversing valve 33 is connected with the first port of safety valve 32, and the second port of electromagnetic reversing valve 33 is connected to the rodless cavity end of leveling circuit 2, and the third port of electromagnetic reversing valve 33 is connected to the rod cavity end of leveling circuit 2, and safety valve 32 is connected to the oil inlet of luffing circuit 1.
[0034] In the specific embodiment of the utility model, as shown in Figure 2As shown, the amplitude changing circuit 1 comprises an electromagnetic reversing valve 11, a first bidirectional balance valve 12 and an amplitude changing oil cylinder 13, the first port and the fourth port of the electromagnetic reversing valve 11 are connected with the boom oil circuit respectively, the second port and the third port of the electromagnetic reversing valve 11 are connected with the first port and the fourth port of the first bidirectional balance valve 12 respectively, the second port and the third port of the first bidirectional balance valve 12 are connected with the rodless cavity and the rod cavity of the amplitude changing oil cylinder 13 respectively.
[0035] In the specific embodiment of the utility model, as shown in the figure, Figure 2 As shown, the leveling circuit 2 comprises a second bidirectional balance valve 21, a third bidirectional balance valve 23, a lower leveling oil cylinder 22 and an upper leveling oil cylinder 24, the first port and the fourth port of the second bidirectional balance valve 21 are connected with the boom oil circuit respectively, the second port of the second bidirectional balance valve 21 is connected with the rodless cavity of the lower leveling oil cylinder 22 and the first port of the third bidirectional balance valve 23, the third port of the second bidirectional balance valve 21 is connected with the rod cavity of the lower leveling oil cylinder 22 and the fourth port of the third bidirectional balance valve 23, the second port and the third port of the third bidirectional balance valve 23 are connected with the rodless cavity and the rod cavity of the upper leveling oil cylinder 24 respectively. The rodless cavity end of the leveling circuit 2 refers to the pipeline between the second port of the second bidirectional balance valve 21 and the rodless cavity of the lower leveling oil cylinder 22, and the rod cavity end of the leveling circuit 2 refers to the pipeline between the third port of the second bidirectional balance valve 21 and the rod cavity of the lower leveling oil cylinder 22.
[0036] The pressurizing process of the pressurizing oil circuit 3 of the utility model is as follows:
[0037] When the boom of the aerial work platform is amplitude changing upwards, the coil DT3 of the electromagnetic reversing valve 33 is electrified, the hydraulic oil is depressurized to a preset pressure by the safety valve 32 from the oil outlet C of the boom oil circuit, and then is pressurized to the rod cavity of the lower leveling oil cylinder 22 through the electromagnetic reversing valve 33, so that the oil pressure of the rod cavity of the lower leveling oil cylinder 22 quickly reaches the preset pilot pressure of the third bidirectional balance valve 23 (namely the balance valve corresponding to the rodless cavity of the upper leveling oil cylinder 24 in the third bidirectional balance valve 23), thereby solving the problem of leveling lag; when the oil pressure of the rod cavity of the lower leveling oil cylinder 22 reaches the preset pilot pressure of the third bidirectional balance valve 23, the upper leveling oil cylinder 24 is retracted, so that the aerial work platform always keeps horizontal.
[0038] When the arm of the aerial work platform is lowered, the coil DT4 of the electromagnetic reversing valve 33 is electrified, the hydraulic oil is depressurized to a preset pressure by the safety valve 32 from the oil outlet C of the arm oil circuit, and then is filled into the rodless cavity of the down leveling oil cylinder 22 through the electromagnetic reversing valve 33, so that the oil pressure of the rodless cavity of the down leveling oil cylinder 22 quickly reaches the preset pilot pressure of the third two-way balance valve 23 (namely the balance valve corresponding to the rod cavity of the up leveling oil cylinder 24 in the third two-way balance valve 23), thereby solving the problem of leveling lag; when the oil pressure of the rodless cavity of the down leveling oil cylinder 22 reaches the preset pilot pressure of the third two-way balance valve 23, the up leveling oil cylinder 24 is extended, so that the aerial work platform is always kept horizontal.
[0039] The utility model discloses a pressure charging oil circuit 3 is from amplitude loop 1 and is unilateral to the leveling loop 2 with the hydraulic oil of the liquid, avoids the problem that the back pressure of oil return rises in the leveling process, when the arm amplitude is up, the rod cavity of leveling loop 2 is filled with pressure, when the arm amplitude is down, the rodless cavity of leveling loop 2 is filled with pressure, realizes the pressure charging of leveling loop 2 and the linkage of arm amplitude, and pressure charging oil circuit 3 only works when the arm amplitude, reduces the energy loss of system.
[0040] In the specific embodiment of the utility model, the safety valve 32 is a pressure cut-off valve, a pressure reducing valve or a pressure reducing overflow valve, which avoids the problem that the pressure after overflow caused by the traditional pressure charging oil circuit 3 being an overflow valve affects the amplitude pressure.
[0041] When the safety valve 32 is a pressure cut-off valve or a pressure reducing valve, the second port of the pressure cut-off valve or the pressure reducing valve is connected to the oil inlet of the amplitude loop 1 (i.e. the pipeline between the first port of the electromagnetic reversing valve 11 and the arm oil circuit), as shown in Figure 1 When the safety valve 32 is a pressure reducing overflow valve, the second port of the pressure reducing overflow valve is connected to the oil inlet of the amplitude loop 1 (i.e. the pipeline between the first port of the electromagnetic reversing valve 11 and the arm oil circuit), and the third port of the pressure reducing overflow valve is connected to the pipeline between the fourth port of the electromagnetic reversing valve 11 and the arm oil circuit, as shown in Figure 2 .
[0042] The above disclosure is only a specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the technical field can easily think of changes or modifications within the technical range disclosed by the utility model, which should be covered within the protection scope of the utility model.
Claims
1. A charge circuit for charging a leveling circuit of a hydraulic leveling system of an aerial work platform, characterized in that: The pressurized oil circuit comprises a reversing valve and a safety valve, a first port of the reversing valve is connected with the safety valve, a second port of the reversing valve is connected with a rodless cavity end of a leveling circuit, a third port of the reversing valve is connected with a rod cavity end of the leveling circuit, and the safety valve is also connected with an oil inlet of a luffing circuit of the hydraulic leveling system.
2. The pressurized oil passage according to claim 1, characterized by: The reversing valve is a hydraulic control reversing valve or an electromagnetic reversing valve. When the reversing valve is a hydraulic control reversing valve, a first control port of the hydraulic control reversing valve is also connected with the rodless cavity end of the luffing circuit, and a second control port of the hydraulic control reversing valve is also connected with the rod cavity end of the luffing circuit.
3. The pressurized oil passage according to claim 1 or 2, characterized by: The safety valve is a pressure cut-off valve, a pressure reducing valve or a pressure reducing overflow valve.
4. A hydraulic levelling system characterised in that: The system comprises the pressurized oil circuit according to any one of claims 1-3.
5. An aerial work platform, characterized by: The platform comprises the hydraulic leveling system according to claim 4.