The concentration of chlorophyll in the water body reflects the content of phytoplankton. Monitoring the content of chlorophyll in water can determine the degree of eutrophication of the water body, and provide early warning of water pollution, algae blooms, and red tides. The chlorophyll sensor adopts the measurement principle of fluorescence method: the substance to be measured is irradiated with excitation light of a certain wavelength to excite it to a high-energy state, and when it returns to the ground state from the high-energy state, it will emit fluorescence greater than the excitation wavelength. The excited fluorescence intensity is the same as that of the substance to be measured Concentration dependent. Digital chlorophyll sensor is an online electrode with RS485 communication interface and standard Modbus communication protocol. Based on fluorescence optical method technology, the chlorophyll sensor has strong anti-interference, high sensitivity, no need for pretreatment, fast measurement, and can measure chlorophyll a of water quality. The chlorophyll sensor is used for plants, algae growth, water eutrophication; early warning of algae outbreaks; the best choice for studying water ecosystems.
chlorophyll sensor, chlorophyll probe, chlorophyll sensor water Suzhou Delfino Environmental Technology Co., Ltd. , https://www.daruifuno.com
/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge>Classification and layout of universal joints Classification and layout of universal joints
Classification and layout of universal joints: /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
1. According to whether the universal joint can change its direction, it can be divided into rigid universal joint and flexible universal joint.
2. Rigid universal joints can be divided into non-equal joints (usually used for cross shaft), quasi-constant joints (such as double joints) and constant velocity joints (such as cages). Three types of universal joints.
(1) The non-constant velocity universal joint cross-shaft rigid universal joint is a non-equal speed universal joint widely used in automobiles; the maximum angle of intersection of two adjacent shafts is 15b-20b. The cross-axis universal joint consists of one Cross shaft; two universal joint forks and four needle bearings, etc. The holes on the two-way joint forks 1 and 3 are sleeved on the two pairs of journals of the cross shaft 2. When the drive shaft changes; The moving shaft can be changed along with it; it can be swayed in the middle direction around the cross shaft; this is accustomed to the need to change the angle and spacing together. Needle bearing 5 is installed between the cross shaft journal and the universal joint fork hole 5 The outer ring of the needle bearing is axially positioned by the snap ring. For the smooth bearing; the grease shaft is usually attached to the cross shaft and the oil passage leads to the journal. The smooth oil can be injected from the grease nozzle to the needle bearing of the cross shaft journal. Where.
Cross-axis universal joint layout: 1- sleeve, 2-cross shaft, 3-drive shaft fork, 4-retainer ring, 5-bearing outer ring, 6-sleeve fork cross-shaft rigid universal joint with simple layout; The strength of the transmission power is high; but in the case where the angle α between the two axes is not zero; the angular velocity transition cannot be transmitted.
When the following two conditions are satisfied; the equiangular speed transmission from the output shaft of the transmission to the input shaft of the transaxle can be completed: the two universal joint forks of the transmission shaft are in the same plane, and the angle between the two axes of the top gimbal is α1 and The angle between the two joints of the second universal joint is α2. Since the drive axle is to be jumped relative to the transmission when traveling; it can not be α1=α2 at any time; in fact, only the transmission to the axle can be approximated, etc. Speed ​​transmission. In the above transmission device; the larger the angle α between the axes; the more uneven the transformation of the transmission shaft; the greater the additional alternating load that occurs; the more helium is used for the life of the machine; the power of the transmission is also reduced; The overall placement should minimize the intersection angle between these axes.
(2) Quasi-constant velocity universal joints Common quasi-constant velocity universal joints have two types of double-type and three-pin type; their working principle is the same as that of double-cross-shaft universal joints to complete constant-speed transmission. .
1- universal joint fork, 2-cross shaft, 3-oil seal, 4-way joint fork; 5-spring spring 6-ball bowl, 7-double fork, 8-ball double joint universal joint It is a double cross-shaft universal joint constant speed transmission that reduces the length of the transmission shaft to a minimum; the double fork is equivalent to the transmission shaft and the universal joint fork on the same plane at both ends. In the output shaft and the input shaft When the angle of intersection is small; the intersection of the two axes of the axis on the arc is very close to the above-mentioned mid-perpendicular line; so that the difference between α1 and α2 is very good. tadpole.
(3) Constant velocity joints The current constant velocity joints commonly used in cars are ball-cage joints; there are also ball-and-clip joints that use the ball-fork joint or the free three-pivot joint. The layout of the star sleeve 7 is connected to the driving shaft 1; the outer surface has six arc-shaped grooves; the inner raceway is formed; the surface of the spherical shell 8 has six corresponding curved grooves; Road.
The six steel balls 6 are placed in the space opposite the raceway of the six sets of tables; and are constrained by the cage 4 in the same plane. The power is transmitted by the drive shaft 1 (and the star sleeve) through the steel ball 6 Output to the spherical shell 8.
Ball cage constant velocity joint 1 - Drive shaft 2,5-steel band, 3-cover 4-cage (ball cage) 6-steel ball 7-star sleeve (inner race) 8-spherical shell ( Outer raceway) The six steel balls in the 9-card global cage constant velocity joint have all the force transmission; the bearing capacity is strong; the torque can be transmitted under the condition that the maximum angle of intersection of the two shafts is 42b; the layout is compact; the disassembly is convenient; Widely used.
In various constant velocity joints; common is the ball cage universal joint; it uses six steel balls to transmit force; the drive shaft and the driven shaft are at any angle of intersection; the steel balls are located at the intersection of the two gardens ; that is, on the bisector of the two-axis intersection; then ensure that the main and driven axes are angularly driven.
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Source: Bearing network time: 2018-07-28