1, pump shaft beating standard 1) journal taper and ovality is not greater than 1/2000 the shaft diameter. But the maximum shall not exceed 0.05mm, and the surface without scars. 2) Bending of the shaft exceeds the allowable value It can be calibrated by mechanical method or heating method. The allowable runout of the shaft is shown in the following table (unit: mm): Shaft diameter at the center of the shaft (1500 r / min) Shaft center (3000 rpms) Multistage pump shaft ≤0.02 ≤0.10 ≤0.08 ≤0.05 1) cold straight method (1) Straightening with hand screw press This method can be used when the shaft diameter is small and the bending is large. First place the shaft in a triangular notch block, or use a thimble on the machine tool to hold both ends of the shaft, then lift the axis of the curved convex apex upward. Use a screw press to hold the top of the protrusion and press it down until the shaft is aligned. (2) twist twist beat beat This method can be used when the shaft diameter is larger and the bending is smaller. This method uses a twist bar to chill the curved concave surface of the shaft so that the surface of the shaft extends straight therethrough. Twist rods should be made of a material with a hardness less than the hardness of the shaft or a copper sleeve on a material of high hardness. The edges of the twist rods must have a corner. With a straight shaft, the concave surface of the shaft faces up and supports the largest curved convex vertex. Press down at both ends with a tensioning device and tap the twist bar with a 1-2 kilogram hammer to stretch the concave material of the shaft by tapping. Twisting, the first from the lowest concave central beat, gradually move to both sides, and along the circumference of the arc on the third, but more to the central beat density should be greater. (3) Straight with a screw jack When the amount of shaft bending is not (less than 1% of the shaft length), you can use the screw jack in cold straightening. In straightening, taking into account the rebound of the shaft, to be overcorrected, in order to ensure that the orthopedic axis more straight. The accuracy of this method can reach 0.05-0.15 mm per meter. (4) Straightening with wire rope 2) Local heating method The curved convex surface up, around the use of asbestos cloth bandage, and then use torch or gas welding heat. The heating temperature is about 100 ℃ lower than the critical temperature of the material. After the rapid heating, due to the plastic deformation of the metal to shorten the surface length, although the cooling after stretching, but can not restore the original state, resulting in reverse the original bending direction of the anti-bending, the convex flat and straight Axis purpose. As in the concave heat to help heat expansion, the better. Heating method, should be uniform, equidistant (about 20 mm from the axial plane), out from the center out, and then screwed into the center to keep the temperature uniform. Heating area and shape with the axial opening (axial long and radial short) method of heating, so that the radial azimuth temperature uniformity, the shaft is not easy to produce distortion. However, when the radial opening (radial long and short axial) heating method, the direct axis effect is significant. Straightening, the first flat on the two bearings on the shaft, so that curved part of the convex upward, and the maximum bending of the shaft with wet asbestos cloth. This asbestos cloth axial openings 0.15d × 0.2d or radial openings 0.35d × 0.2d (d is the diameter of the shaft) of the rectangular port, and then heated at the opening with oxyacetylene flame 3-5 minutes (using a powerful torch, And oxygen pressure increased to 4-5 atmospheres), the temperature reaches 500-600 ℃, with a dry asbestos cloth covered heat, heat 10-15 minutes, and finally with compressed air blowing, so that the rapid cooling. Shaft bending changes can be measured by the dial indicator. Once failed to align can be repeated, after straightening, the shaft should be low temperature annealing in the heating, the shaft is rotated and slowly heated to 300-350 ℃, at this temperature for more than an hour, and then heated with asbestos cloth Department, it is slowly cooled to 50-70 ℃, so that you can eliminate the internal stress. The amount of change in shaft alignment during the alignment is related to the material properties of the shaft itself. When heated, the bending deflection at the end of the shaft gradually increases to the maximum due to the expansion of the metal after heating of the protrusions. After cooling, the bending deflection at the shaft end is gradually reduced to the minimum, which is due to the shortening of the metal fiber due to the rapid cooling of the convex portion. 3) Internal stress relaxation method The principle is that the metal material has the property of relaxation, that is, the stress of the part is reduced at high temperature, the elastic deformation of the part is reduced and the proportion of the plastic deformation is increased. At this time, if the load in a certain direction is added, the deformation direction of the part can be controlled With size. When the lifting of the load, due to its plastic deformation-based, so little rebound, so as to achieve the purpose of straight axis. Multi-purpose heating coil induction coil, after the straight axis should be annealed. This method is mostly used on the big axis. 4) Mechanical heating direct axis method Pre-fixed shaft, convex upward, and then with the applied load bending the axial pressure in the convex compression stress, and then heated at the concave surface, but also the straight axis. This method is only applicable to less curved shaft. Various kinds of industrial control cabinets for customers are customized, which are mainly divided into strong electric control cabinet, weak current control cabinet, all kinds of single machine control cabinets and all kinds of single machine control cabinets. Electronic Control,Electric Control System,Power And Control Systems,Control System XinxiangHexie Feed Machienry Manufacturing Co.Ltd , https://www.feedmill.nl
2, the pump shaft alignment method
The amount of shaft alignment is usually proportional to the number of beats. Note the initial beat, the shaft straightening faster after the slow. Be careful to grasp twist twist rod, do not damage the shaft surface.
The strong electric control cabinet has modular combination electric cabinet, GGD control cabinet, PLC control cabinet and so on. The weak current control cabinet adopts special PVC material to make the process simulation screen, which can clearly and intuitively reflect the operation process and facilitate monitoring.
The user can choose the control mode combined with the central control of the analog screen and the computer control ingredients or the computer complete screen control mode.