用于液压升降平板运输车的下降调速控制装置

Abstract

本实用新型公开了一种用于液压升降平板运输车的下降调速控制装置包括，负载敏感泵、负载敏感多路阀、下降调速控制阀组以及油缸，其中，所述负载敏感泵与油箱相联通；所述负载敏感多路阀与所述负载敏感泵之间连接有进油管路和反馈油管路,而所述负载敏感多路阀与所述油箱之间连接有回油管路；所述下降调速控制阀组的进口与所述负载敏感多路阀的出口相连接，所述下降调速控制阀组的出口与所述油缸连接以控制所述油缸平稳同步下落，所述下降调速控制装置能够控制与升降平板相联通的多组油缸同步平稳下落，避免了下降平台发生偏载的可能，同时其下降速度也不会受到负载变化的影响。

Claims

1. A descent speed control device for a hydraulic lift flatbed truck, characterized by, It includes a load-sensitive pump (2), a load-sensitive multi-way valve (4), a descent speed control valve group (5), and multiple sets of hydraulic cylinders (7), among which, The load-sensitive pump (2) is connected to the oil tank; The load-sensitive multi-way valve (4) is connected to the load-sensitive pump (2) by an oil inlet pipe and a feedback oil pipe, and the load-sensitive multi-way valve (4) is connected to the oil tank by a return oil pipe. The inlet of the descent speed control valve group (5) is connected to the outlet of the load-sensitive multi-way valve (4), and the outlet of the descent speed control valve group (5) is connected to the multiple sets of oil cylinders (7) respectively, so as to control the multiple sets of oil cylinders (7) to fall smoothly and synchronously.

2. The droop control device of claim 1, wherein The outlet of the load-sensitive pump (2) is connected to the inlet of the load-sensitive multi-way valve (4) by an oil inlet pipeline, and the load port of the load-sensitive multi-way valve (4) is connected to the control port of the load-sensitive pump (2) by a feedback oil pipeline.

3. The droop control device of claim 2, wherein The oil inlet pipeline is equipped with a pressure oil filter (3), wherein the inlet of the pressure oil filter (3) is connected to the outlet of the load-sensitive pump (2) via an oil pipe, and its outlet is connected to the inlet of the load-sensitive multi-way valve (4) via an oil pipe.

4. The droop control device of claim 1, wherein An oil suction filter (1) is also provided between the load-sensitive pump (2) and the oil tank. The oil sucked out of the oil tank is filtered by the oil suction filter (1) and then flows into the load-sensitive pump (2). An oil return filter (8) is provided on the oil return pipeline. The oil return from the load-sensitive multi-way valve (4) is filtered by the oil return filter (8) and then flows back into the oil tank.

5. A droop control device according to claim 3 or 4, wherein The load-sensitive multi-way valve (4) has multiple sets of working components. The descent speed control valve group (5) consists of multiple descent speed control valves that correspond one-to-one with the working components. Each descent speed control valve corresponds to a set of oil cylinders. Each set of working components of the load-sensitive multi-way valve (4) individually controls the rise and fall of the corresponding oil cylinder.

6. The droop control device of claim 5, wherein The load-sensitive multi-way valve (4) has four sets of working components. Each set of working components controls the lifting and lowering of a corresponding set of hydraulic cylinders. The descent speed control device includes four sets of hydraulic cylinders, which are respectively located at the four corners of the lifting platform of the hydraulic lifting flatbed transport vehicle.

7. The droop control device of claim 5 or 6, wherein Each of the aforementioned speed control valves includes a logic valve (51), a check valve (52), a hydraulic check valve (53), a dual-pipeline explosion-proof valve (54), a pressure sensor (55), a pressure gauge (56), and a second ball valve (58). The logic valve (51) is connected in parallel with the check valve (52) and then in series with the hydraulic check valve (53). The dual-pipeline explosion-proof valve (54) is located at the outlet of the speed control valve. The cylinder (7) corresponding to the speed control valve is connected to the outlet of the speed control valve via the dual-pipeline explosion-proof valve (54). The pressure sensor (55) and the pressure gauge (56) are located on the pipeline between the hydraulic check valve (53) and the dual-pipeline explosion-proof valve (54). One end of the second ball valve (58) is connected to the pipeline between the hydraulic check valve (53) and the dual-pipeline explosion-proof valve (54), and the other end is connected to the inlet of the return oil pipeline.

8. The droop control device of claim 7, wherein Each working assembly of the load-sensitive multi-way valve (4) has two output oil paths. One output oil path is connected to one end of the parallel logic valve (51) and the check valve (52), while the other output oil path is connected to the hydraulic check valve (53) in the working assembly.

9. The droop control device of claim 8, wherein, Each of the aforementioned speed control valves further includes a pressure relief valve (57), one end of which is connected to the pipeline between the hydraulic check valve (53) and the dual-pipeline explosion-proof valve (54), and the other end is connected to the inlet of the return oil pipeline.

10. The droop control device of claim 7, wherein, A ball valve (6) is also provided between each set of the oil cylinders (7) and the corresponding dual-pipe explosion-proof valves (54).

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