Talking about the use of new self-lubricating plastic sliding bearing on the isolating switch

The use of new self-lubricating plastic sliding bearings on the isolating switch

First, the isolation switch definition

The Disconnector is mainly used to reliably isolate the part of the high-voltage power distribution device that needs to be powered off from the live part to ensure the safety of the maintenance work. When the isolating switch is in the sub-position, there is an insulation distance and an obvious disconnection mark between the contacts in accordance with the specified requirements; in the combined position, it can carry the current under normal loop conditions and under abnormal conditions (such as short circuit) within a specified time. Current switching device

Second, the working principle of the isolation switch

The contacts of the isolating switch are all exposed to the air and have obvious breaking points. The isolating switch has no arc extinguishing device and therefore cannot be used to cut off the load current or short circuit current. Otherwise, under the action of high voltage, the breaking point will generate a strong arc. It is difficult to extinguish itself, and may even cause arcing (relative to ground or phase-to-phase short circuit), burning equipment, endangering personal safety. This is a serious accident called "loading isolation switch". The isolating switch can also be used to switch between certain circuits to change the way the system operates. For example, in a double bus circuit, an isolated switch can be used to switch a running circuit from one bus to another. At the same time, it can also be used to operate some small current circuits; aluminum plate spot welding machine

Third, the use of the sliding bearing of the rotating part of the isolating switch

The contact of the isolating switch, that is, the separating action of the isolating knife can be completed by manual and electric control, but in any case, it is required that the rotating parts can smoothly run under any circumstances, which requires the bearing of each rotating part to be longer. After the pause of time, it can still ensure normal operation; in order to ensure the normal operation of the isolating switch during the annual maintenance process, it is required that the sliding bearing of each rotating part can resist high and low temperature staggering all the year round and can still be used after the end face cover fails. Resist the erosion of various external factors, such as salt fog, acid rain, oxidative corrosion and other natural factors.

In the early days, the domestic and foreign isolating switch manufacturers were able to solve the various rotating parts of the isolating switch. After the long-term stop, the metal sliding bearings were used in all rotating parts, such as powder metallurgy bearings, copper alloy bearings and three-layer composite. Bearings; although these bearings have adopted the self-lubricating process, they can not change the disadvantages of metal bearings, such as the lubricant is easy to dry, the corrosion and rust after the cover fails, etc. The isolation switch can not ensure the normal operation after long-term stop. . At present, the domestic use of a certain proportion of the three-layer composite bearing, although the inner diameter of the working surface is sintered with a lubricating layer, but this layer of lubricating layer thickness is only 0.03mm, when the lubricating layer works off the surface of the rotating shaft and the underlying metal copper powder layer or low The direct contact of carbon steel may result in rust and adhesion of the shaft and the surface of the metal bearing after a long pause, and the isolating switch has a risk of failure. In order to completely solve these risks, European isolation switch manufacturers first began to try to use new plastic self-lubricating bearings and after years of use prove that engineering plastic self-lubricating bearings become the most effective means of isolating switches to solve the risk of rotational failure.

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How to choose the servo motor housing correctly

Parallel slitted housings are usually made of a single piece of metal. Aluminum is often used, and spiral slitting is used to accommodate deflection and torque transfer. They usually have good functionality and have a price advantage, and in many practical applications, it is the product of choice. The single piece of original data is designed to complete the torque transfer without backlash and the maintenance-free advantages. There are two fundamental series here: single-slit and multi-slit.

The single-slot type has a long multi-ring long slit, which gives the bearing housing a good elasticity and a small bearing load. It can accept all kinds of deflections, and is most suitable for handling angular displacement and axial displacement, but the parallel bias has a weaker receiving force. Because the single slit is bent together in two different directions, a large external pressure will occur. This incurs premature damage to the parts. Although the long single-sleeve housing can be easily bent under the biased condition, the rigidity of the bearing housing has the same effect under the torsional load. Excessive turning clearance under torsional loads can affect the accuracy of the housing and weaken its overall function. Single-slot housings are an economical choice and are best suited for low torque applications, especially in articulated encoders and other lighter instruments.

Multi-slit housings typically have 2-3 slits to create a low torque rigid Issue. The multi-slit type allows the slit to be shortened without impairing the biasing ability. The short slit increases and overlaps the torque rigidity of the bearing housing to allow it to accept a very large torque. This function makes it suitable for light load applications, such as the connection of servo motors and lead screws. This function does not have any negative effects: as the size of the slit increases beyond the single-slot type, the bearing load will increase, but in a few cases, the bearing can be sufficiently useful to maintain. A few manufacturers have extended the concept of multi-cutting to another level. In addition to a set of multiple slits, two sets of multiple slits are also used together. Multiple sets of multiple slits make the housing more flexible and biased. The increase in size means the ability to accept parallel deflection. Compared to single slits and single-sleeve multi-slit housings, multiple sets of multi-slit housings can be bent together in different directions in parallel deflections. Comply with this bias. Today, a large number of this series of housings are made of aluminum, but there are also a few manufacturers that supply stainless steel for design. In addition to corrosion resistance, stainless steel housings also increase torque acceptance and stiffness, sometimes reaching twice the equivalent of aluminum. But this increased torque and stiffness is also offset by increased mass and inertia. Many time negative effects will also surpass their strengths, so users have to find other ways of bearing housing. In the use of small motors, a large percentage of the motor torque is used to restrain the inertia of the housing, which will severely impair the overall function of the piece.

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How to judge the quality of KOYO bearings

First, the outer packaging of KOYO bearings is clear:

Under normal circumstances, KOYO bearings of the factory brand have their own special designers to design the external packaging, and arrange the production facilities to produce and produce, so the packaging is very clear from the line to the color block, unambiguous, part The brand's accessory packaging also has a unique design specifically designed to protect your intellectual property.

Second, whether the steel printing on KOYO bearings is clear:

Brand words, labels, etc. will be printed on the KOYO bearing body. The font is very small, but most of the products produced by the factory use the stamping technology, and the type is pressed before the heat treatment, so the font is small, but the recess is deep and very clear. The fonts of counterfeit products are not only blurred, but because of the rough printing technology, the fonts float on the surface, and some can even be easily erased by hand.

Third, KOYO bearing KOYO bearing body has a strange noise:

Hold the KOYO bearing inner sleeve of KOYO bearing with your left hand, and turn the outer sleeve with your right hand to make it rotate to hear if there is any noise. Due to the backward production conditions of most counterfeit products, it is completely hand-worked. It is inevitable that impurities such as sand will be incorporated into the KOYO bearing body during the production process, so it will make noise when rotating. This is the biggest difference between a factory brand that strictly enforces production standards and operates with machines.

4. Is there any turbid oil on the surface of KOYO bearings:

This should be paid special attention when purchasing KOYO bearings. Since the current domestic anti-rust technology is not particularly good at home, it is easy to leave a thick oil trace when the KOYO bearing body is rust-proof, and it is sticky on the hand, and the foreign original KOYO bearing is almost seen. Not to trace the anti-rust oil, but it is particularly careful that the expert said that KOYO bearing smells like a smell, it must be under the anti-rust oil, just can't see it.

5. Whether the chamfer of KOYO bearing is uniform:

The so-called chamfering of KOYO bearings, that is, the intersection of the horizontal and vertical faces, the counterfeit KOYO bearings are not well handled at these corners due to the limitation of production technology.

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NA bearing lubrication skills

Rust prevention performance

The grease used in the INA bearing must have an anti-rust effect, and the anti-rust agent is preferably insoluble in water. Grease should have good adhesion to form an oil film on the surface of the steel, even if the grease is filled with water.

Mechanical stability

Grease becomes soft during machining and causes leakage. When there is a vibration application example, the grease will be pulled from the INA bearing housing into the INA bearing. If the mechanical stability of the grease is not sufficient, the grease will be continuously thrown out of the INA bearing, which will cause mechanical collapse of the soap structure and destruction of the grease.

Oil seal

The oil seal is necessary to protect the INA bearings and lubricants from external contamination, and no matter whether the sundries or moisture can penetrate into the INA bearing to prevent damage. Proper installation and maintenance is an important factor in the longest service life of INA bearings. At the same time, we must pay attention to the cleanliness of the INA bearing, the correctness of the INA bearing selection and the selection of appropriate installation and maintenance tools. INA bearings must be protected from contaminants and moisture and must be properly installed and lubricated. The design of the INA bearing, the condition of the oil seal, the type of lubricant and the lubrication cycle, as well as the special maintenance play an important role.

Mixed grease

Never mix incompatible greases. If two incompatible greases are mixed, the consistency will usually soften and eventually damage may occur due to the loss of grease. If you don't know which type of grease was originally used in INA bearings, you should first remove the old grease inside and outside the INA bearing to add grease.

Classification of oils and fats

According to temperature and working conditions: grease can be classified according to their allowable working temperature. The consistency and lubricating ability of grease are affected by working temperature. Imported INA bearings operating at a certain temperature must choose the correct consistency at the same temperature. Grease with good lubrication. Grease is manufactured in different operating temperature ranges and can be classified into low temperature (LT), medium temperature (MT) and high temperature (HT) greases. At the same time, there is a type of grease called EP (extrusion resistant) or EM (resistant to extrusion and added molybdenum disulfide), with additives to enhance the strength of the lubricant film.

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