Method for detecting belt tension

In transmissionBeltThe degree of tension has a great influence on its transmission capacity, service life and shaft pressure. The belt is in a slack state, and it is easy to slip in actual work, which reduces the transmission efficiency. If the belt is too tight, it is easy to produce greater bearing pressure in actual work, thereby reducing the working life. For many years, there has been no mature test method for the tension test of the V-belt for the belt drive of the mechanical drilling machine. In order to realize the detection and reasonable adjustment of belt tension, most of the existing detection methods are based on experience, and no effective theoretical method has been formed. At present, with the increasing number of mechanical drilling rigs, it is urgent to realize the reliable detection of the belt tension of mechanical drilling rigs.

A technical person provides a method for detecting belt tension to solve the problem in the prior art that a user relies on experience to detect belt tension when using a mechanical drilling machine, and the detected belt tension is unreliable. The belt tension detection method is implemented according to the following steps: 1. install the belt tension detection device, hinge the oil cylinder assembly in the corresponding ear plate on the sliding seat, firmly hinge the two ends of the adjusting screw with the sliding seat and the small pulley transmission assembly, Make the screw in the adjusting screw in the retracted state, then install the belt on the large pulley and the small pulley, and the belt is in a slack state; 2. fix the base, turn the adjusting screw, make the two ends of the screw in the adjusting screw extend at the same time, and the small pulley drive assembly drives the small pulley to move to the left, and the center distance between the large pulley and the small pulley increases, so as to adjust the belt tension until the tension side of the belt does not sag and the slack side is tightened. At this time, the belt is just under tension. Determine the center distance a and span t of the horizontal projection of the large pulley and the small pulley shaft; calculate the belt tension 3. theory to obtain the load g and the specified deflection f; 4. slowly extend the piston rod of the oil cylinder assembly, keep still after the end of the piston rod just touches the position below the center point of the two tangent points of the belt, read the initial scale of the piston rod of the oil cylinder assembly; then continue to extend the piston rod of the oil cylinder assembly to apply a vertical load G to the belt, and the loading direction of the vertical load G is perpendicular to the center of the belt; then, according to the new scale value of the scale on the piston rod, the deflection f1 of the belt under the action of vertical load g is obtained; 5. the load g perpendicular to the belt is applied, the deflection f1 of the belt is obtained. Compare the deflection f1 with the specified deflection f calculated theoretically to determine whether the belt tension meets the requirements, and specifically adjust the deflection f1 to meet the requirements.

The above detectionBeltThe beneficial effects of the tension method are: the belt tension detection is more convenient, the detection method is simple and easy, and the detection equipment is simple to operate; the installation and operation are convenient, economical and reliable, and the work efficiency is significantly improved. It is widely used in various large and small mechanical drilling rigs. Specifically, it includes the following aspects: 1. The detection method is simple and easy, and the belt installed on the equipment can be detected at any time without interfering and damaging the surrounding equipment, which improves the detection efficiency; 2. The test equipment and tools are simple to manufacture, easy to install, and simple to operate, fully considering the field conditions and operability of the drilling rig; 3. The detection of belt tension is helpful for the optimization design of the transmission components of the drilling rig and the accumulation of the original data.

Cut three samples with a length of 250 mm from one PJ V-ribbed belt, and mark a marking line with a spacing of 100mm at the middle position of the PJ V-ribbed belt. When more than three samples cannot be taken from one PJ V-ribbed belt, samples can be cut from the same batch of PJ V-ribbed belt, but must be indicated in the report. 7.4.2 High temperature resistance test method
Place the sample at 100 ℃ ± 2 ℃ for 96 h ± 1 h and then take it out. After standing at laboratory temperature for more than 2h, bend it along a cylinder with a diameter of 20 mm at a contact angle of at least 90 °.