Reasonable application of pilot operated check valve and throttle valve

Check valve in the hydraulic circuit is widely used, but the valve should be fully consider the characteristics of the valve, otherwise it will cause the loop is not stable, especially in high-pressure system, the pilot-operated check valve open reverse The pressure at the front port P2 is high, as shown in Figure 1a. To reduce the control pressure, hydraulic shock and noise in the hydraulic system, a hydraulic check valve with unloaded spool is also used, as shown in Figure 1b. Unloading valve can make the performance of the pilot check valve is improved, the pilot check valve is characterized when the pilot check valve port K is no pressure oil, the pressure oil can only flow from port P1 to port P2 , Can not reverse. When the control port K has control pressure oil, the oil pushes the ejector rod due to the control piston, and the ejector pin opens the unloading valve spool at the same time. At the same time, the main valve spool opens and connects the two ports of P1 and P2. The oil can be in these two Free flow direction, the unloading valve reduces the hydraulic impact, hydraulic check valve performance more stable, but there is still a large flow of high-pressure impact or noise. Hydraulic check valve is often used in packing, pressure relief, locking circuit. As shown in Figure 2a pressure holding circuit, due to the packing process in the system, due to pressure, oil compression, pipe expansion, elastic deformation of the components can store energy, when the pressure relief, the amount of kidney suddenly release, and In the valve from the center to the left when the pressure on the cylinder cavity on the lower chamber pressure has increased at this time, as shown in Figure 1b law unloading valve and the main valve is almost opened at the same time, so that the pressure on the oil chamber Suddenly through the liquid-controlled check valve release to the return line. Because of these two reasons we coexist and make pressure relief pressure too fast, resulting in shock vibration and noise, for which we have improved this type of hydraulic circuit. Due to the high-pressure high-flow hydraulic check valve caused by the pressure relief too fast, so that the impact increases, in order to add a throttle in the circuit (Figure 2b), so that the pilot check valve unloading valve first Open, and then open the main valve, the throttle valve has sufficient flow control range, to ensure a stable minimum flow, easy adjustment, small leaks, temperature and pressure on the impact is small, so by adjusting the throttle, control the hydraulic cylinder Upper chamber of the oil pressure relief time is also extended accordingly, the pressure will enhance the ability to send back on the hydraulic oil on the impact of various components and noise. Once on its high-pressure high-flow hydraulic check valve loop made the same improvements, the results can meet the requirements, does not affect the control piston speed.

Cross Roller Bearing is a special type bearing. Because of the inner ring or outer ring were separated, after loading the roller and the cage, it is fixed with the cross roller shaft ring to prevent the separation, so the operation is simple when installing the cross roller shaft ring. Since the rollers are intersected, only one set of cross roller bearings can withstand the load in each direction, which is three to four times more rigid than the traditional model. At the same time, because the inner ring or outer ring of the cross Roller Bearing is a two-part structure, the bearing clearance can be adjusted, and even if it is preloaded, it can obtain a high-precision rotary motion. Moreover, because of its special structure, it is commonly used in industrial robots as joint bearings.

The classification and model series of cross roller bearings are below:

RB type (outer ring segment)

RB series models for cross roller bearing, basic, inner and outer ring size is minimal to miniaturization, its structure is the outer ring is divided, the inner ring design is an organic whole, the inner ring spinning of high precision parts suitable for requirements.

RE type (inner ring segment)

The RE series is a new type of XRB design concept, which is the same size as the XRB type.The structure of the inner ring is the split type and the outer ring is one design, which is suitable for the parts with high rotating precision of outer ring.

RU type (inner and outer circle)

The RU series model is not required to be fixed flange and support base due to the processing of mounting holes.In addition, due to the adoption of the integrated inner and outer ring structure of the belt, the installation has little effect on the performance, thus achieving stable rotation precision and torque.Can be used for outer ring and inner ring rotation.

RBC type (outer ring segment)

The RBC series model (corresponding to the CRBC series of IKO company) is composed of the outer ring is the split type, the inner ring is one design, and the belt is fully loaded with roller bearings.Suitable for high rotation accuracy of inner ring.

CRBH type (inner and outer ring)

CRBH series model, outer ring and outer ring are integral structure, used for outer ring and inner ring rotation.

RA type (outer circle segmentation, ultrathin type)

The RA series model is the compact type that reduces the thickness of RB and outer ring to the limit.Suitable for areas with light weight and compact design, such as rotating parts of robot and manipulator.

SX type (outer ring segment)

The structure of SX series is similar to that of RB series. The outer ring is a two-part structure, which is designed with three spring card rings and the inner ring, which is suitable for the place where the inner ring has high rotation precision.

XRU08 type (inside and outside)

XSU08 series is similar to the RU series, and the inner and outer rings have been machined with holes, so no fixed flange and support seats are required.Due to the adoption of the integrated inner and outer ring structure, the installation has little effect on the performance, thus achieving stable rotation precision and torque.Can be used for outer ring and inner ring rotation.

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Cross Roller Bearing

Cross Roller Bearing,Excavator Parts Cross Roller Bearings,High Precision Cross Roller Bearing,Thin Section Cross Roller Slewing Bearing

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