Abstract: The present application relates to a photon measuring and reading device, which belongs to the field of detection equipment, including a mounting seat and a photon counter. The photon counter can move up and down on the mounting seat. The mounting seat is provided with a vertically arranged sliding trough, and the photon counter is provided with a sliding rod slidably connected with the sliding trough. A double head motor is arranged on the mounting base, and a linkage mechanism is arranged between the output shaft at the tail end of the double head motor and the sliding rod. The bottom end of the photon counter is fixed with a box body.

Abstract: The present application relates to a cleaning device, including an inverted U-shaped frame body, which includes a horizontal beam, and both ends of the beam are respectively connected with vertical beams perpendicular to the beam; a horizontal bearing plate for bearing a cleaning mechanism and a first driving mechanism for driving the bearing plate to move up and down are provided in the frame body; the cleaning mechanism comprises a magnetic sleeve assembly and a magnetic rod in a sleeve connection with it, and the magnetic rod is connected with a second driving mechanism for driving it to move up and down relative to the magnetic sleeve assembly; and movements between the first driving mechanism and the second driving mechanism are coordinated by a PLC.

Abstract: The present application relates to a photon measuring and reading device, which belongs to the field of detection equipment, including a mounting seat and a photon counter. The photon counter can move up and down on the mounting seat. The mounting seat is provided with a vertically arranged sliding trough, and the photon counter is provided with a sliding rod slidably connected with the sliding trough. A double head motor is arranged on the mounting base, and a linkage mechanism is arranged between the output shaft at the tail end of the double head motor and the sliding rod. The bottom end of the photon counter is fixed with a box body.

Abstract: The present invention relates to a catalyst composition for ethylene oligomerization and the use thereof. Such catalyst composition includes chromium compound, ligand containing P and N, activator and accelerator; wherein the chromium compound is selected from the group consisting of acetyl acetone chromium, THF-chromium chloride and Cr(2-ethylhecanoate)3; general formula of the ligand containing P and N is shown as: in which R1, R2, R3 and R4 are phenyl, benzyl, or naphthyl. R5 is isopropyl, butyl, cyclopropyl, cyclopentyl, cyclohexyl or fluorenyl; the activatior is methyl aluminoxane, ethyl aluminoxane, propyl aluminoxane and/or butyl aluminoxane; the accelerator is selected from the group consisting of 1,1,2,2,-tetrachloroethane, 1,1,2,2-tetrabromoethane, 1,1,2,2-tetrafluoroethane, and compounds having a formula of X1R6X2, in which X1 and X2 are F, Cl, Br, I or alkoxyl, R6 is alkylene or arylene group; the molar ratio of chromium compound, ligand containing P and N, activator and accelerator is 1:0.

Abstract: The present invention relates to a catalyst composition for ethylene oligomerization and the use thereof. Such catalyst composition includes chromium compound, ligand containing P and N, activator and accelerator; wherein the chromium compound is selected from the group consisting of acetyl acetone chromium, THF-chromium chloride and/or Cr(2-ethylhecanoate)3; general formula of the ligand containing P and N is shown as: in which R1, R2, R3 and R4 are phenyl, benzyl, or naphthyl. R5 is isopropyl, butyl, cyclopropyl, cyclopentyl, cyclohexyl or fluorenyl; the activatior is methyl aluminoxane, ethyl aluminoxane, propyl aluminoxane and/or butyl aluminoxane; general formula of the accelerator is X1R6X2, in which X1 and X2 are F, Cl, Br, I or alkoxyl, R6 is alkyl or aryl; the molar ratio of a, b, c and d is 1:0.5˜10:50˜3000:0.5˜10.