Hydrostatic bearing hydraulic cylinder with front liquid resistor

Abstract

The utility model relates to the technical field of hydraulic cylinders, in particular to a hydrostatic bearing hydraulic cylinder with a front liquid resistor, which comprises a cylinder barrel and cylinder covers, the cylinder covers cover the two ends of the cylinder barrel, and oil supply ports and oil drainage ports are formed in the cylinder covers; the piston rod penetrates through the cylinder cover and can move in the axial direction of the cylinder barrel, and an oil pad assembly is arranged between the piston rod and the cylinder cover; the front liquid resistor is arranged in the oil supply port, a through hole is formed in the front liquid resistor, a liquid stopping part detachably connected with the front liquid resistor is arranged in the through hole in a penetrating mode, the liquid stopping part comprises a plurality of liquid stopping pieces, and the liquid stopping part can move in the through hole. By adjusting the number of the liquid blocking pieces, the sectional area of the liquid blocking part arranged in the through hole in the penetrating mode is adjusted, so that the proportion of the sectional area of the liquid blocking part in the plane where the through hole is located in the radial direction is changed, the through-flow area is adjusted, and the ideal liquid-resistance ratio is obtained.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of hydraulic cylinders, in particular to a static pressure supporting hydraulic cylinder with a front liquid resistor. BACKGROUND

[0002] The static pressure support is composed of an oil supply device, a front liquid resistor and an oil pad assembly. The oil pad assembly is composed of an oil cavity, an oil sealing edge and an oil return groove. The oil supply device is divided into quantitative oil supply and constant pressure oil supply, and the constant pressure oil supply device usually needs to be used in cooperation with the front liquid resistor, and the liquid resistance ratio of the front liquid resistor and the oil sealing edge needs to be adjusted.

[0003] The commonly used front liquid resistor is a capillary tube and a small hole. The static pressure supporting oil pad assembly with the capillary tube as the front liquid resistor has lower bearing capacity than that with the small hole. The small hole has a very small diameter, and the size of the small hole is usually only a few tenths of a millimeter. The small hole with a size of a few tenths of a millimeter is easy to block.

[0004] The key of the static pressure support is the liquid resistance ratio of the front liquid resistor and the oil sealing edge, and the front liquid resistor often needs to be adjusted according to the situation of the oil sealing edge. The small hole often needs to be finely adjusted. Since the size of the small hole is very small, a special drill bit needs to be customized for processing. The drill bit used for processing the small hole is very thin and has poor strength, and is easy to bend and break. Not only the drill bit is scrapped, but also the small hole is easy to deform, so that the processing difficulty is high and the processing cost is high. In view of the above factors, the size of the small hole is difficult to finely adjust, and the size of the small hole is difficult to accurately control, so that the adjustment difficulty of the liquid resistance ratio is increased. CONTENT OF THE UTILITY MODEL

[0005] The application aims to solve one of the problems in the background art.

[0006] To this end, the application provides a static pressure supporting hydraulic cylinder with a front liquid resistor.

[0007] The application solves the technical problems by adopting the following technical scheme:

[0008] The static pressure supporting hydraulic cylinder with a front liquid resistor comprises,

[0009] a cylinder barrel, and

[0010] a cylinder head, which is arranged at both ends of the cylinder barrel and is provided with an oil inlet and an oil outlet;

[0011] a piston rod, which penetrates through the cylinder head and can move along the axial direction of the cylinder barrel, and is provided with an oil pad assembly between the cylinder head and the piston rod;

[0012] a front liquid resistor, which is arranged in the oil inlet and is provided with a through hole, and a liquid resistance part which is detachably connected with the front liquid resistor is arranged in the through hole, the liquid resistance part comprises a plurality of liquid resistance pieces, and the liquid resistance part can move in the through hole.

[0013] Further, the liquid blocking part is provided with a limiting part at both ends thereof, and the cross-sectional area of the limiting part is larger than the area of the through hole in the plane in which the through hole extends radially.

[0014] Further, the cross-sectional area of the liquid blocking part can be adjusted by the number of the liquid blocking members in the plane in which the through hole extends radially.

[0015] Further, the liquid blocking member is a metal wire.

[0016] Further, the metal wire is plastic, and the metal wire at the end of the liquid blocking part is wound to form the limiting part.

[0017] Further, a plurality of metal wires are twisted into a spiral shape to form the liquid blocking part.

[0018] Further, the limiting part is detachably connected with the liquid blocking part.

[0019] Further, the oil pad assembly comprises an oil cavity, an oil sealing edge and an oil return groove, the oil cavity is arranged opposite to and communicated with the oil supply port, and the oil sealing edge is arranged between the oil cavity and the oil return groove.

[0020] The application adjusts the cross-sectional area of the liquid blocking part arranged in the through hole by adjusting the number of the liquid blocking members, thereby changing the proportion of the cross-sectional area of the liquid blocking part in the plane in which the through hole extends radially, adjusting the flow area, and obtaining an ideal liquid resistance ratio.

[0021] The scheme is simple in operation, low in requirement for the diameter of the through hole, and high in qualified rate of the through hole processing.

[0022] During the movement of the liquid blocking part in the through hole, the liquid blocking part can take away impurities in the hydraulic oil, and especially when the liquid blocking part is in a spiral shape, the effect of cleaning the impurities in the through hole is better, so that the through hole is not easy to be blocked. BRIEF DESCRIPTION OF DRAWINGS

[0023] The application will be further described below in combination with the drawings and examples.

[0024] Figure 1 is a structural schematic view of a hydrostatic supporting hydraulic cylinder with a front liquid resistor in the application.

[0025] Figure 2 is a structural schematic view of a front liquid resistor in the application. Figure 1 A-A sectional view for embodying the structure of the oil pad assembly in the application.

[0026] Figure 3 is a structural schematic view of a front liquid resistor in the application.

[0027] In the figure: 1, cylinder barrel; 11, oil hole; 2, cylinder cover; 21, oil supply port; 22, oil drain port; 23, sealing ring; 24, oil cavity; 25, oil sealing edge; 26, oil return groove; 3, piston rod; 4, piston; 5, front liquid resistor; 51, liquid resistance part; 52, liquid resistance piece; 53, limiting part; 54, through hole. DETAILED DESCRIPTION

[0028] The utility model will be explained in further detail in combination with the drawings. These drawings are all simplified schematic diagrams, and only illustrate the basic structure of the utility model in a schematic manner, so they only show the structure related to the utility model.

[0029] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, so it cannot be understood as a limitation on the utility model. In addition, the features limited as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0030] In the description of the utility model, it is understood that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0031] Reference Figures 1-3The application relates to a static pressure supporting hydraulic cylinder with a front liquid resistor 5, which comprises a cylinder barrel 1, a piston rod 3, a piston 4 and cylinder covers 2, the cylinder covers 2 are fixedly installed at the two ends of the cylinder barrel 1, the cylinder covers 2 are provided with bosses towards the end portions of the cylinder barrel 1, the bosses are inserted into the cylinder barrel 1, sealing rings 23 are arranged between the side walls of the bosses and the inner walls of the cylinder barrel 1, and the sealing rings 23 are embedded on the side walls of the bosses. The piston rod 3 coaxially penetrates through the cylinder barrel 1 and the cylinder covers 2, the piston 4 is connected to the piston rod 3, the piston 4 is located in the cylinder barrel 1, and sealing rings 23 are also arranged between the piston 4 and the inner walls of the cylinder barrel 1. The piston 4 divides the internal space of the cylinder barrel 1 into two adjusting oil chambers, and two oil holes 11 are formed in the side wall of the cylinder barrel 1 and are communicated with the two adjusting oil chambers respectively.

[0032] The two cylinder covers 2 are provided with oil discharge ports 22 and oil supply ports 21, the oil discharge ports 22 are located on the sides, away from the cylinder barrel 1, of the oil supply ports 21, a plurality of oil supply ports 21 are arranged along the circumferences of the cylinder covers 2, oil pad assemblies are arranged between the cylinder covers 2 and the piston rod 3, and the oil discharge ports 22, the oil supply ports 21 and the oil pad assemblies on the two end covers form two groups of static pressure bearings for supporting the piston rod 3. Figure 1 、 2 The oil pad assembly specifically comprises oil chambers 24, oil sealing edges 25 and oil return grooves 26, the oil chambers 24 are arranged on the inner side walls of the cylinder barrel 1, the plurality of oil chambers 24 are oppositely arranged with and communicated with the plurality of oil supply ports 21, the oil return grooves 26 are arranged on the inner side walls of the cylinder barrel 1, the oil return grooves 26 can be oppositely arranged with the oil discharge ports 22 and can be arranged between the oil chambers 24, and the oil sealing edges 25 are arranged between the oil return grooves 26 and the oil chambers 24.

[0033] The front liquid resistor 5 is inserted into the oil supply port 21, hydraulic oil flows out from the oil discharge port 22 through the front liquid resistor 5 and the oil pad assembly, the hydraulic oil forms a certain pressure in the oil chambers 24, the pressure supports the piston rod 3, and the pressure depends on the liquid resistance ratio of the front liquid resistor 5 and the oil pad assembly.

[0034] The front liquid resistor 5 is inserted into the oil supply port 21, hydraulic oil flows out from the oil discharge port 22 through the front liquid resistor 5 and the oil pad assembly, the hydraulic oil forms a certain pressure in the oil chambers 24, the pressure supports the piston rod 3, and the pressure depends on the liquid resistance ratio of the front liquid resistor 5 and the oil pad assembly. Figure 3 The front liquid resistor 5 is a column body, a through hole 54 is formed in one end of the column body and faces the piston rod 3, an oil channel is formed in the other end of the column body, the through hole 54 is communicated with the oil channel, the diameter of the through hole 54 is smaller than that of the oil channel, a liquid resistance part 51 is arranged in the through hole 54 and can move in the through hole 54, and the liquid resistance part 51 is detachably connected with the column body. Specifically, the end portion of the liquid resistance part 51 is provided with a limiting part 53, the cross-sectional area of the limiting part 53 in the plane where the through hole 54 is located is larger than that of the through hole 54, and the limiting part 53 can prevent the liquid resistance part 51 from being separated from the through hole 54.

[0035] The liquid blocking part 51 comprises a plurality of liquid blocking pieces 52, by changing the number of the liquid blocking pieces 52, the cross-sectional area of the part of the liquid blocking part 51 penetrating the through hole 54 is adjusted, so that the proportion of the cross-sectional area of the liquid blocking part 51 in the plane where the through hole 54 is located is changed, the flow area is adjusted, and the liquid resistance is changed to obtain the ideal liquid resistance ratio.

[0036] In the embodiment, the liquid blocking piece 52 is a metal wire, a plurality of metal wires are twisted into a spiral shape to form the liquid blocking part 51, and the metal wire has plasticity, the metal wire at the end of the liquid blocking part 51 can be twisted into a shape with a diameter larger than that of the through hole 54 to form the limiting part 53, so that the liquid blocking part 51 is prevented from coming out of the through hole 54.

[0037] In other embodiments, the liquid blocking piece 52 can also be a rod-shaped piece, the limiting part 53 can be provided as a block, the limiting part and the liquid blocking part can be detachably connected, and the limiting part 53 can be provided with a containing groove, the end of the plurality of liquid blocking pieces 52 is inserted into the containing groove and is connected with the limiting part 53 in interference.

[0038] In the application, by adjusting the number of the liquid blocking piece 52, the cross-sectional area of the liquid blocking part 51 penetrating the through hole 54 is adjusted, so that the proportion of the cross-sectional area of the liquid blocking part 51 in the plane where the through hole 54 is located is changed, the flow area is adjusted, and the ideal liquid resistance ratio is obtained.

[0039] The scheme is simple to operate, and has low requirements on the diameter of the through hole 54, the size of the through hole 54 can be a conventional size, and a custom drill bit is not required, so that the processing difficulty is low, the processing cost is low, and the qualified rate of the through hole 54 is high.

[0040] During the movement of the liquid blocking part 51 in the through hole 54, the liquid blocking part 51 can carry away impurities in the hydraulic oil, and especially when the liquid blocking part 51 is spiral-shaped, the effect of cleaning the impurities in the through hole 54 is better, so that the through hole 54 is not easy to be blocked.

[0041] Based on the above ideal embodiments according to the present application, through the above description, relevant personnel can make various changes and modifications without deviating from the technical idea of the present application. The technical scope of the present application is not limited to the contents in the specification, and must be determined by the scope of the claims.

Claims

1. A hydrostatic bearing hydraulic cylinder having a front liquid choke, characterized in that, The utility model relates to a cylinder-piston unit, comprising, a cylinder barrel (1), and a cylinder cover (2) covering both ends of the cylinder barrel (1), the cylinder cover (2) being provided with an oil inlet (21) and an oil outlet (22); a piston rod (3) penetrating through the cylinder cover (2) and being movable along the axial direction of the cylinder barrel (1), the piston rod (3) and the cylinder cover (2) being provided with an oil pad assembly therebetween; a front liquid resistor (5) provided in the oil inlet (21), the front liquid resistor (5) being provided with a through hole (54), a liquid blocking part (51) detachably connected with the front liquid resistor (5) being provided in the through hole (54), the liquid blocking part (51) comprising a plurality of liquid blocking pieces (52), the liquid blocking part (51) being movable in the through hole (54).

2. The hydrostatic bearing hydraulic cylinder with a front liquid restrictor according to claim 1, characterized in that, Both ends of the liquid blocking part (51) are provided with limiting parts (53), in the plane where the through hole (54) is located radially, the cross-sectional area of the limiting part (53) being greater than the area of the through hole (54).

3. The hydrostatic bearing hydraulic cylinder with a front liquid restrictor according to claim 1, characterized in that, In the plane where the through hole (54) is located radially, the cross-sectional area of the liquid blocking part (51) can be adjusted by the number of the liquid blocking pieces (52).

4. The hydrostatic bearing hydraulic cylinder with a front liquid restrictor according to claim 2, characterized in that, The liquid blocking piece (52) is a metal wire.

5. The hydrostatic bearing hydraulic cylinder with a front liquid barrier according to claim 4, characterized in that The metal wire has plasticity, the metal wire at the end of the liquid blocking part (51) being wound to form the limiting part (53).

6. The hydrostatic bearing hydraulic cylinder with a front liquid restrictor according to claim 5, characterized in that, A plurality of metal wires are twisted into a spiral shape to form the liquid blocking part (51).

7. The hydrostatic bearing hydraulic cylinder with a front liquid restrictor according to claim 2, characterized in that, The limiting part (53) is detachably connected with the liquid blocking part (51).

8. The hydrostatic bearing hydraulic cylinder with a front liquid restrictor of claim 1, wherein, The oil pad assembly comprises an oil cavity (24), an oil sealing edge (25) and an oil return groove (26), the oil cavity (24) being provided opposite to and in communication with the oil inlet (21), the oil sealing edge (25) being provided between the oil cavity (24) and the oil return groove (26).

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