The tube sheet is the main component of the lithium bromide refrigeration unit, and the processing of the tube sheet is an important production link. The tube sheet processing process is drilling, reaming and in-hole grooving. Among them, the grooving in the hole requires high precision and is difficult, (see), using Z35 radial drilling machine for processing. Due to the large number of holes in the tube sheet, there are up to 2,000 holes on the tube sheet. In order to improve production efficiency, it is required to cut 200 holes per machine per shift. How to break into the prescribed production tasks under the existing conditions has become a difficult problem to be solved. After careful research and many trials, the following process improvement measures were summarized and achieved good results in the application.

1Selection of coolant: The tool material is high-speed tool steel. Through actual test, the cooling liquid such as soapy water, kerosene, engine oil and casing oil is not as good as the saponification liquid, the workpiece is smooth, and it is economical and practical (saponification liquid) Low price) 2 shank improvement Because the design tolerances and assembly dimension chains of the tool shank are relatively conservative, the gap between the arbor mandrel and the inner sleeve is small (0.01mm), so after cutting a few slots, The shank does not slide between the shank and the inner sleeve, so that the eccentric spring top of the arbor does not move, and thus the knife cannot be retracted. According to the analysis, it is necessary to increase the amount of clearance between the mandrel and the inner sleeve of the cutter bar, increasing it to 0.03~0.05mm, so that the cutter bar can slide freely in the sleeve to ensure the automatic retracting effect is ideal.

3 Tool geometry improvement The tool geometry is the focus of process improvement. The original design tool is the geometric angle of the ordinary turning tool (see X for improved tool geometry).

Our analysis believes that the cutting force is not too large when cutting the tool, because the grooving in the 020 hole "20. 60 * 3 single side removed 0.3mm, such as the spindle 170r / min (common speed), the average knife The amount is about 0.02mm/r. So take measures (i% make the tool sharper and extend the use time by changing the geometrical angle of the tool. (2) Grinding the angle of 15.mm under the back angle to 2mm (see) to avoid resistance Knife phenomenon. Through the improvement of the geometrical angle of the tool and the analysis of the spindle speed and the amount of the knife, we use the manual cutter, which is faster than the motorized cutter, so that it can be boldly shaken into the handle, and the tool wear is reduced. No need to sharpen the knife.

4 Tool size improvement Two slots in the hole should have upper and lower cutting edges. To ensure the radial dimension of the machining, the upper edge of the tool must be ground 0.2~0.3mm, because the shank is thinner (/010) The resistance during grooving makes the size of the machined lower groove smaller than the upper groove size by 0.2E 0.3 combined with the tool figure mm (see), and the tool is formed on the tool grinding machine.

This ensures that the radial dimensions of the machined upper and lower grooves are the same. Cut Groove Li Shugang, born in 1968, graduated from the Mechanical Engineering Department of Shanxi Mining Institute in 1991. (Continued on page 28) 3.1 Power saving 70min calculation of electricity consumption = 0.001 (107.26-21.83) z107.26x100% = 79.65, if the other syllables that are started with the filter press are counted Up to 80 or more.

3.2 Operating life The 50LZ2 type impurity pump has a tangential speed reduction of 18.6 compared with the WARMAN3/2 type slurry pump. Due to the low tangent speed of the 50LZ2 type impurity pump, it has a lighter wear life and a lower pump case temperature at the same pressure of the pump outlet. .

3.3 Productivity WARMAN3/2 type slurry pump hits a plate for 4 hours, and the 0LZ2 type impurity pump uses only 70 minutes (1.17h) to increase productivity by 2.4 times.

4 Conclusion LZ2 series impurity pump solves the problem of pump casing heating and packing leakage in other feed pumps, improves the working environment at the production site, and provides sound protection for standardization management. At the same time, this kind of pump saves energy and can bring good economic benefits.

The axial dimension (upper page 26) is primarily controlled by the knife dial on the Z35 rocker drill.

5 The selection of the optimal spindle revolution number selects the number of spindle revolutions. The efficiency is not high. The number of spindle revolutions is too high. The tool is easily damaged. We use the experimental method to increase the spindle from 85~120r/min to 120M160r/min, and finally increase it to 170~200r/min. It is found that it is not appropriate to increase the spindle revolution. Therefore, it is determined that the tool with the best operation method is a special cutting inner groove cutter bar designed and manufactured by the factory itself, and has a positioning sleeve. The inner cutter bar body and the knife sleeve constitute a cutter sleeve, and the eccentric blade has a gap of 2 to 3 mm between the hole walls. Therefore, firstly, the spindle is machined down to the blade so that the blade is basically in contact with the hole wall, and then the car is processed for machining. When the groove is machined to the workpiece size, the parking knife can save the time of 2~2.5mm. In order to improve work efficiency.

7 Conclusion Through the improvement of the above six aspects, the working efficiency and work quality of the in-hole grooving process have doubled. The grooving process has been raised from 200 holes per machine per shift to 1000 holes. For a 2000-hole tube plate, the efficiency of the machine can be increased by 5 times, ensuring the production schedule and ensuring product quality. At the same time, these six process improvement measures have been promoted as workshops for processing similar workpieces as mature and advanced experience.

(Finish)

Conveyor pulleys are the main elements providing the transmission of torque from the drive and ensuring that belts remain taught. As per international standard design and manufacturing technology, there are Head Pulley , tail pulley and Bend Pulley . Conveyor pulleys are often lagged with rubber to improve the friction between the drive pulley and the belt. Conveyor Pulleys are used to transmit the drive power into the conveyor belt and as such, are subjected to the dynamic belt tension forces in a conveyor.