Pressure leading-in type piston structure
A piston and pressure technology, applied in the field of hydraulic cylinders, can solve the problems of limiting the accuracy and efficiency of pressure sensors to receive signals, achieve the effects of reduced size, compact oil cylinder structure, and improved reversing accuracy
Inactive Publication Date: 2021-05-07
XCMG HYDRAULICS CO LTD
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Problems solved by technology
[0003] In the conventional pumping main cylinder, the pressure sensor can only receive the differential pressure signal when the piston passes the pressure sensor. The length of the piston limits the accuracy and efficiency of the pressure sensor receiving the signal, which also leads to the need to increase the length of the pumping main cylinder to ensure The piston can pass over the pressure sensor
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Embodiment Construction
[0016] The following is a specific embodiment of the present invention, and the present invention will be further described in conjunction with the accompanying drawings.
[0017] Such as figure 1 with figure 2 As shown, a pressure-introduced piston structure, the piston body 1 is installed in the middle of the piston rod of the main pumping cylinder 1, the main seal 4 is installed on the circumferential surface of the piston body 1, and two sides of the main seal 4 are installed respectively. The supporting ring 3 on the circumferential surface of the piston body 1 . The left end of the piston body 1 is a large chamber for pumping the main oil cylinder 1 , and the left end surface of the piston body 1 is provided with an oil guide hole 5 . One or more oil guide holes 5 can be provided, and when a plurality of oil guide holes 5 are provided, the plurality of oil guide holes 5 are selected to be evenly distributed around the axis. The oil guide hole 5 includes one axial hol...
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The invention discloses a pressure leading-in type piston structure suitable for a hydraulic control type pumping main oil cylinder. The piston structure comprises a piston body installed in the middle of a piston rod, and a main seal is installed on the circumferential face of the piston body; supporting rings installed on the circumferential face of the piston body are arranged on the two sides of the main seal separately; and an oil guide hole is formed in the end face of the piston body, and the inner end of the oil guide hole is located at the position, between the main seal and the supporting ring, of the circumferential face of the piston body. According to the piston structure, pressure oil in a large cavity of an oil cylinder is guided into the middle of the seal through the oil guide hole; when the pressure oil in the large cavity passes through a receiving area of a pressure sensor at the position, the pressure difference formed by high-pressure oil and low-pressure oil is obvious; an accurate reversing signal can be provided, and the reversing precision is improved; pressure oil in the large cavity of the oil cylinder is guided into the middle of the seal through the oil guide hole; in this way, the pumping main oil cylinder can be triggered to reverse through the receiving area of the pressure sensor, and the piston does not need to be completely crossed; and the oil cylinder structure is more compact, and the axial size is reduced.
Description
technical field [0001] The invention relates to the technical field of hydraulic cylinders, in particular to a pressure-introduced piston structure suitable for a hydraulically controlled pumping main oil cylinder. Background technique [0002] Hydraulic control pumping main cylinder: hydraulic control refers to the reversing method of the pumping main cylinder, which uses the pressure difference between the two ends of the pressure sensor installed at the stroke end of the pumping main cylinder to form a reversing signal to achieve the reversing function of the pumping main cylinder . At present, the main pumping cylinders of pump trucks and towed pumps in concrete machinery mostly adopt the hydraulic control reversing mode. Due to the limitations of the weight and length of the whole vehicle, higher requirements are put forward for the length of the main pumping cylinders. [0003] In the conventional pumping main cylinder, the pressure sensor can receive the differential...
Claims
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IPC IPC(8): F15B15/14F15B19/00
CPCF15B15/1457F15B15/1452F15B15/1447F15B15/1423F15B19/00
Inventor 孙朗朗刘朋刘庆教郭彦斌
Owner XCMG HYDRAULICS CO LTD