Promotion lighting every month
Promotion lighting every month direct from G-Lights Lighting Factory in CN with BV TUV SGS and Intertek authoried.
Every month will be 2-5 items in big promotion, with competitive pprice and good quality.
Cooperate with G-Lights, clients will enjoy and served by our Effective Supply Chain Management, Solution providing, priority of clients` service, close working relationships to achieve Win-Win.
Promotion lighting,High Quality Promotion lighting,Promotion lighting deals Details, CN ZHONGSHAN G-LIGHTS LIGHTING CO., LTD. , https://www.glightsled.com
How to improve the buffer height of the liquid before filtering is the focus of the research on the structure of the filter. The flat type paper filter is the original type of paper filter. The filter paper support surface is made of flexible metal woven mesh. The metal mesh not only supports the filter paper, but also drives the walker by the power and drives the filter paper to walk, thereby updating the filter paper which is too clogged. The flexible metal woven mesh is formed by the superposition of its own weight and a certain amount of coolant weight, which is the area of ​​the liquid buffer before filtering. The limited flexibility of the metal woven mesh limits the depth of the pocket bottom, so that the height h of the buffer liquid acting on the surface of the filter paper is very limited, even if h can continue to increase, from the physical point of view, if the filter paper is attached in the same socket shape On the supporting metal mesh, an excessive value of h is bound to cause the filter paper to produce wrinkles that are radially around the center of the socket, which eventually leads to deviation and disorder of the filter paper. Therefore, the limitations of this structure determine that such a filter is difficult to form too much flow unless at the expense of the bulk of the overall layout of the overall processing system. In addition, the filter paper is floated on the surface of the metal mesh. When the metal mesh is running, the filter paper is driven by the friction between the filter paper. When the filter paper surface is small, the friction is insufficient to drive the filter paper shaft to rotate, which will produce relative Sliding phenomenon, that is, the paper transport mechanism walks and the filter paper does not go. In summary, the flat-type filter has a larger footprint than the other types under the same flow conditions. Because the structure and operation of such filters are relatively simple, and they belong to relatively mature products of early technology, they are widely popular in China.
2. Drum-type paper tape filter In order to reduce the floor space and increase the liquid buffer height before filtration, the drum-type paper tape filter has been named because its structural body is a rotating drum. The drum is composed of two connected rollers. The two sleeve roller chains connected by the filter paper support net are pressed on the two rims of the drum, and the sprocket drive chain on the power shaft drives the drum. The filter paper that is rotated and pressed between the chain and the rim also walks, thereby realizing the function of outputting the stain paper. From the structure of the drum-type paper belt filter, the drum makes the filter paper form a half-moon cavity, so that the height value h of the buffer liquid acting on the surface of the filter paper is greatly improved, so the liquid filtration flow rate is significantly improved. Relative to the same flow horizontal flat belt filter, the drum type paper belt filter reduces the footprint, although the height is increased, but the height increase is not sensitive to most users. In order to prevent the liquid from leaking at the edge of the drum, a tension spring is arranged at the floating drive shaft, and the tension of the tension spring acts to press the chain and the filter paper against the rim. As the liquid height in the drum increases, the pressure acting on the support surface of the filter paper increases, and the chain and the filter paper that are pressed against the rim may leave the rim and cause a gap to cause liquid leakage, which affects the filtration quality, so the tension spring is The tension must be greater than the gravity at the liquid's ultimate height so as not to create side leakage. In order to increase the height of the buffer liquid and increase the flow rate, it is necessary to increase the wrap angle α of the filter paper support surface on the drum as much as possible, which also tends to increase the height of the dirty paper output port. Practice has proved that when the output height of the dirty paper is higher than the central axis of the drum, the output paper is easily attached to the inner surface of the support surface, and then, as the wrap angle α increases, the filter paper inside the dirty paper output port The angle θ with the vertical plane will be reduced or even negative, so that the dirt on the filter paper is difficult to “crawl out†with the filter paper, so the limit of the height of the liquid accumulated in the drum is the radius of the drum. In fact, the liquid level is limited by many conditions, such as assembly process, liquid level electrical signal feedback setting, drum shaft end seal and other factors. In order to balance these factors, the overall integrated function of the equipment is coordinated, and the buffer level can only be lower than The drum center must be sized to achieve normal operation. From this point of view, it is seeming to be a waste of space resources that the drum-type paper belt filter drum is difficult to utilize.
3. Arc type paper belt filter 1. Curved paper belt filter structure The basic type of arc type paper belt filter is taken from the horizontal paper belt filter paper belt filter, and the arc type paper belt filter is in the main body. Arc-shaped guide rails are arranged on both sides of the frame, and the filter paper support surface is distributed along the lower edge of the guide rail to form a valley bottom, and the curvature of the arc-shaped guide rail determines the depth of the buffer liquid. In order to increase the height of the buffer liquid and increase the flow rate, it is necessary to increase the curvature of the arc-shaped guide rail as much as possible. As the curvature of the arc-shaped guide rail increases, the angle θ between the filter paper on the inner side of the dirty paper output port and the vertical surface will decrease. When the value of θ is too small, the dirt on the filter paper is difficult to “crawl out†with the filter paper, so the curvature of the curved guide rail cannot be increased without limit. According to the difference of the adsorption force of the dirt particles, it is more suitable to take the angle of the center of the curved guide rail by 80~110°. The same belongs to the forced storage of the liquid buffer space. Compared with the drum type paper belt filter, the valley paper belt filter eliminates the upper part of the drum. Therefore, the valley paper filter combines the flat paper. Advantages of a filter belt and a drum type tape filter. 2. Side seal form Since the filter paper forms a valley with the support surface, there is a side seal problem. First, the guide rail and the main frame are sealed, and the rest is only the sealing problem between the support surface, the filter paper, and the guide rail. (1) The rubber pad is on the filter paper. The sealing form is to place the rubber gasket under the curved guide rail. The filter paper is pressed against the lower surface of the rubber gasket by the filter paper support surface. We call it the upper and lower rigid type. "The upper and lower parts here are bounded by filter paper." Because the rubber gasket is fixed, this type of seal is simple and easy to implement. The type of filter belt filter that is currently on the market is such a sealed form filter. The paper conveying mode of the sealing type filter is driven by the filter paper supporting surface to drive the filter paper. When the filter paper is walking, the frictional resistance between the rubber pad and the rubber pad is overcome, and the rubber surface is gliding. Obviously, between the rigid filter paper supporting surface and the filter paper The friction coefficient is much smaller than the friction coefficient between the filter paper and the flexible rubber pad, so theoretically it is impossible to drive the filter paper when walking on the support surface of the filter paper. The solution is to reduce the width of the rubber gasket to reduce the contact surface with the filter paper, even the line contact, while reducing the pressure between the support surface, the filter paper and the rubber mat. This will inevitably affect the sealing effect and bring about the disadvantages of easy side leakage. Even so, its paper-feeding process is not very stable and reliable, which is a defect in this form of sealing. (2) The rubber pad is under the filter paper. The sealing form is to place the rubber gasket under the filter paper. The rubber gasket and the filter paper are pressed against the lower surface of the curved guide rail by the filter paper support surface. formula". This type of sealing requires that the rubber gasket must follow the filter paper support surface, that is, when the filter paper support surface is running, the filter paper is driven to travel synchronously. Since the friction coefficient between the flexible rubber mat and the filter paper is much larger than the friction coefficient between the filter paper and the rigid curved guide rail, the paper transport function of the seal form is very stable and reliable. 3. Paper-clamping type filter paper requires a certain clamping pressure between the filter paper support surface and the guide rail to ensure that the liquid does not leak at the same time and realize the paper-feeding function. The paper jam has the following three forms: (1) The upper and lower fixed rails are fixed on both sides of the main body frame, and the front and rear shafts of the supporting filter paper support surface are fixed, which forms a pinch form of upper and lower fixed. In this situation, the position of the front or rear axle needs to be adjusted during assembly of the equipment so that the filter paper support surface is tensioned and fixed. This tension must be greater than the gravity of the limit buffer liquid to avoid side leakage. However, since the chain which is subjected to the tensioning force of the tension and the liquid gravity will be plastically deformed and elongated after a period of use, a side leakage will eventually occur, and the tensioning force needs to be adjusted again, and so on until the material is cold hardened. It is a fixed-up defect. (2) The upper fixed floating rail is fixed on both sides of the main frame, the front or rear axle of the supporting filter paper surface floats and is tensioned by the tension spring, and is pressed by the tension spring, and the filter paper supporting surface presses the filter paper Fix the lower arc of the upper rail. The tension of the tension spring must be greater than the gravity of the limit buffer liquid to avoid side leakage. Compared with the upper and lower fixed type, the upper fixed lower floating paper clamping form avoids the side leakage phenomenon caused by the plastic deformation of the chain. (3) The front and rear axles of the upper floating fixed filter paper support surface are fixed, and the pressure of the compression spring acts on the floating upper rail, and the upper rail is pressed against the filter paper and the support surface to tension the support surface. When the equipment is working, because the clamping pressure is consistent with the direction of gravity of the liquid, the force of the supporting surface is the superposition of the pressure of the compression spring and the gravity of the liquid, and the liquid gravity acts only on the supporting surface of the filter paper through the filter paper, and the clamping pressure of the filter paper is the pressure spring. Pressure, this pressure is constant, that is to say, no matter how much liquid is in the buffer cavity, the upper floating rail is pressed against the filter paper with a constant pressure through the gasket, which reduces the leakage of the side leakage. Therefore, the upper floating type should be ideal as the preferred structure. 4. The shape of the upper floating rail As mentioned earlier, the upper floating fixed structure makes the clamping pressure of the filter paper constant, but this constant is only the sum of the pressures. Although the guide rails pressed against the filter paper are floating, the shape of the guide rail itself is rigid, so the distribution of this pressure throughout the guide rail is uneven. When there is no liquid, the support surface and the shape of the catenary under the action of self-weight, when there is part of the liquid, the upper part of the liquid is the drag line, and the lower part of the liquid is the hydraulic bottom line (because the corresponding linear equation is not described, it is temporarily called the hydraulic bottom line) From the perceptual analysis, when there is a liquid, the linear shape of the catenary is lower than the bottom of the catenary when the liquid is linear, and the two sides converge, and the line shape changes with the height of the liquid. Because we are concerned about the side leakage problem, according to the analysis, the most ideal design shape of the guide rail should match the hydraulic bottom line, so that the guide rail acts on the filter paper at a uniform pressure, but since the hydraulic bottom line is changed, Regardless of the shape of the guide rail, the pressure uniformity can only be achieved at a fixed liquid level, and this height should be the estimated design height. The purpose of our analysis of line shape and change is to have a perceptual understanding of this. In practice, it is difficult or difficult to make the guide rail into a shape such as a catenary or a hydraulic bottom line, so it is generally possible to use a circular arc instead.
Based on the above analysis, the side seal form of the valley paper belt filter adopts “upper and lower soft typeâ€, and the upper and lower fixed type of paper feeding and clamping type should be the most ideal design idea. How to realize it?
4. Floating inner cavity rubber tile paper-type paper tape filter 1. Basic structure floating inner cavity rubber tile paper-type paper tape filter hereinafter referred to as floating cavity rubber tile filter machine, unlike other paper tape filter machine is floating cavity The rubber tile filter has a separate inner cavity, the bottom of the inner cavity is hollow, and the bottom sides of the inner cavity are curved guide rails of a certain width, and the inner side of the inner cavity is limited by the main body frame, which limits the freedom of displacement in the Z direction and limits the X, The Y-axis rotation degree of freedom is limited by the pendulum axis fixed to both sides of the main body frame, and the two displacement degrees of freedom in the X and Y directions are limited. Therefore, the inner cavity retains only one degree of freedom of swing, and the gravity forms a torque on the filter paper through the pendulum shaft. Face edge. The side seal is in the form of “upper and lower softâ€. ​​This type of seal requires that the flexible gasket must follow the filter paper support surface, that is, the flexible sealing tape pressed against the lower edge of the filter paper must be able to run synchronously with the filter paper support surface to drive the filter paper. Output, there are two options for achieving synchronization. One is to use a synchronous toothed belt instead of a steel chain, and the other is to use a rubber tile in parallel with the steel chain. Each rubber tile has two holes, the aperture and the chain pin. The shaft diameter is the same and the pitch is the same as the chain pitch. Wear a rubber tile on each side of the 2-section sleeve roller chain. The toothed belt is soft, continuous, and has good attachment performance, but the circumference of the toothed belt is fixed and closed, which is not suitable for assembly, adjustment and maintenance, and the connection between the toothed belt and the filter paper support surface is difficult to realize. The rubber tile is a unit of the sealing and paper conveying mechanism. The connection of multiple rubber tile units forms a complete sealing band. The rubber tile sealing structure is flexible, easy to assemble, adjust and maintain, and the rubber tile unit can be used in multiple series products. . From the microscopic point of view, the softness, continuity and adhesion of the rubber tile are not as good as the toothed belt, but as long as the shape and size of the rubber tile are reasonable, the sealing requirements can be fully achieved. Therefore, comparing the two schemes, it is better to use the rubber tile seal form. 2. The position of the pendulum shaft and the force analysis filter paper are between the inner cavity and the support surface, so the arc guide rail under the inner cavity has a smaller pressure on the support surface, and the smaller the probability of side leakage, the axis of the pendulum axis and the center of gravity of the inner cavity The greater the distance, the greater the pressure on the filter paper support surface, so the swing axis should be placed at the front or rear end away from the center of gravity of the cavity. From a static point of view, since the shape of the inner cavity is symmetrical, the pendulum axis is set at the foremost end and the last end of the inner cavity. The pressure formed on the filter paper support surface is equal, but the pendulum axis is dynamic. The force at the foremost end of the inner chamber is better than the axis of the pendulum shaft at the last end. The total pressure is the integral of the pressure at each point of the arcuate guide rail. Conclusion: The structure and assembly adjustment of the floating chamber rubber belt filter is simple, small in size, stable in operation, smooth in filter paper, and free from deviation. It concentrates all the advantages of several other filters and should be said to be a development trend.
Discussion on the Structure of Several Paper Belt Filters for Machine Tool Cutting Fluid Filtration
Several gravity type paper belt filter structures for machine tool cutting fluid filtration discuss the paper belt filter used for machine tool cutting fluid coolant filtration. The popular form is to filter the pressure through the filter paper formed by the self-weight of the coolant. The vacuum filter that relies on the negative pressure to increase the flow rate is not used in China. A typical paper belt filter that is commonly used by domestic liquid weight filtration in China is nothing more than a flat type and a drum type. In recent years, an arc type paper tape filter has appeared. Because we are discussing the structure of the filter, the flow rate of the filter is proportional to the product of the area of ​​the filter paper passing through the liquid and the average pressure of the liquid acting on the surface of the filter paper, regardless of the filter coefficient of the filter paper and the viscosity coefficient of the medium. . The area of ​​the filter paper depends on the size of the device. The pressure is generated by the weight of the liquid. In the case of limited volume of the device, according to the above formula, only the height of the liquid acting on the filter paper can be increased to effectively increase the flow rate of the filter.