CN101303306B - Photomultiplier tube moving device for side-lying dual-purpose electrochemiluminescence measuring cell - Google Patents

Abstract

The utility model relates to a photomultiplier tube mobile device for a side-lying dual-purpose electrochemiluminescence measuring cell, which belongs to the technical field of electrochemiluminescence detection. The device needs to be used in conjunction with the side-lying dual-purpose electrochemiluminescence measurement cell. The bottom surface and the back of the measurement cell are respectively provided with a bottom measurement window and a rear measurement window. It is composed of a moving mechanism and a photomultiplier tube assembly. Two sets of driving gears, The middle pulley, the upper pulley, the pressure wheel and the conveyor belt constitute two belt-wheel mechanisms, which are installed at both ends of the transmission shaft through two driving gears. The DC motor is connected with one end of the transmission shaft through a reduction gear box. The ends pass through the left and right L-shaped holes respectively and are connected to two conveyor belts. The device can move the photomultiplier tube to the front of one of the two measurement windows as required. The device enables the side-lying dual-purpose electrochemiluminescence measuring cell to realize the detection of electrochemiluminescence of different luminescent materials, different electrode forms and multiple electrodes.

Description

Photomultiplier tube moving device for side-lying dual-purpose electrochemiluminescence measuring cell

technical field

The invention relates to a photomultiplier tube moving device for a side-lying dual-purpose electrochemiluminescence measuring cell, which belongs to the technical field of electrochemiluminescence detection.

Background technique

At present, in the electrochemiluminescence detectors on the market, the measurement window is located on the bottom surface of the measurement cell, and the photomultiplier tube is fixedly installed directly below the measurement window. For example, the MPI-E electrochemiluminescence detector produced by Xi'an Ruimai Analytical Instrument Factory. This structure is only suitable for detecting the luminescent signal of the bottom emitting columnar electrode. With the development of electrochemiluminescence technology, the application fields of electrochemiluminescence detectors are becoming more and more extensive, requiring electrochemiluminescence detectors to be more versatile, that is, requiring different luminescent materials, different electrode forms and Electrochemiluminescent signals from multiple electrodes can be detected. In order to meet this requirement, the inventors developed a side-lying dual-purpose electrochemiluminescence measuring cell. There are measurement windows on the bottom and side surfaces of the measurement pool. In order to enable a photomultiplier tube to detect the electrochemiluminescence signal emitted from one of the two measurement windows as required, the measurement cell needs to be equipped with a photomultiplier tube moving device so that the photomultiplier tube can be moved to the two measurement windows as needed Directly in front of one of the measurement windows, the electrochemiluminescent signal emitted from the measurement window is detected.

Contents of the invention

The purpose of the present invention is to introduce a photomultiplier tube moving device for a side-lying dual-purpose electrochemiluminescence measuring cell, which enables the side-lying dual-purpose electrochemiluminescence measuring cell to realize different luminescent materials and different electrode forms and multi-electrode detection of electrochemiluminescence.

To achieve the above object, the present invention adopts the following technical solutions. The device is composed of a moving mechanism and a photomultiplier tube assembly. Two sets of driving gears, a middle pulley, an upper pulley, a pressure wheel and a conveyor belt constitute two belt-wheel mechanisms, which are installed at both ends of the transmission shaft through two driving gears. The DC motor The reduction gear box is connected to one end of the transmission shaft, and the two ends of the photomultiplier tube assembly are respectively passed through the left and right L-shaped holes and then connected to two conveyor belts. This device can move the photomultiplier tube to between the two measurement windows as required. directly in front of one.

The technical solution of the present invention is now described in detail.

A photomultiplier tube mobile device for a side-lying dual-purpose electrochemiluminescence measuring cell, which needs to be used in conjunction with a side-lying dual-purpose electrochemiluminescence measuring cell, and the bottom surface and the back of the measuring cell are respectively provided with bottom surface measurement windows and the back measurement window, the DC motor in the device works under the command and control of the single-chip microcomputer in the measurement pool, it is characterized in that the device is composed of a moving mechanism and a photomultiplier tube assembly, and the moving mechanism includes a DC motor and a reduction gear Box, left driving gear, left middle pulley, left upper pulley, left pressure wheel, left conveyor belt, left track plate, transmission shaft, right drive gear, right middle pulley, right upper pulley, right pressure wheel, right conveyor belt, right track plate, left The track plate and the right track plate are respectively installed on the left and right sides of the measuring pool, the left track plate and the right track plate are parallel to each other, and the left track plate and the right track plate are parallel to the left and right sides of the measuring pool , the drive shaft runs through the left track plate and the right track plate in a manner orthogonal to the left track plate and the right track plate, the left driving gear and the right driving gear are respectively fixed on the left and right ends of the drive shaft, the left middle pulley, the left upper The pressure rollers are installed on the left surface of the left track plate through their respective shafts, and the right middle pulley, upper right pulley and right pressure wheel are installed on the right surface of the right track plate through their respective shafts. The left track plate and the right track plate have respectively The left L-shaped channel and the right L-shaped channel, the plane formed by the center line of the vertical arm of the left L-shaped channel and the center line of the vertical arm of the right L-shaped channel is parallel to the back side of the measurement pool, and the left L-shaped channel. The plane formed by the center line of the horizontal arm and the center line of the horizontal arm of the right L-shaped channel is parallel to the bottom surface of the measuring pool, the center line of the vertical arm of the left L-shaped channel and the center of the vertical arm of the right L-shaped channel The distance between the plane formed by the lines and the back of the measuring pool is equal to the plane formed by the center line of the horizontal arm of the left L-shaped channel and the center line of the horizontal arm of the right L-shaped channel and the distance between the measured pool The distance between the bottom surfaces, the shaft of the DC motor is connected to the left end of the transmission shaft through the reduction gear box, the left conveyor belt is set on the left driving gear, the left middle pulley, the left upper pulley and the left pressure wheel, the left conveyor belt, the left driving gear, the left middle The pulley, left upper pulley and left pressure pulley form a left L-shaped belt-wheel transmission mechanism. The right conveyor belt is set on the right driving gear, right middle pulley, right upper pulley and right pressure roller. The right conveyor belt, right driving gear, right middle pulley, right upper The pulley and the right pressure wheel form the right L-shaped belt-wheel transmission mechanism, DC motor, reduction gear box, left driving gear, left middle pulley, left upper pulley, left pressure wheel, left conveyor belt, left track plate, transmission shaft, right driving gear , right middle pulley, right upper pulley, right pressure wheel, right conveyor belt, and right track plate form a moving mechanism for the left conveyor belt and right conveyor belt to move in the same direction when the DC motor rotates. The photomultiplier tube assembly includes photomultiplier tubes, sockets, and photomultiplier tubes. Sleeve, left cover, right cover, photomultiplier tube rotary sleeve, photomultiplier tube rotary sleeve gear, left shaft, right shaft, left shaft sleeve, right shaft sleeve, trigger screw frame, side switch trigger screw, bottom switch Trigger screw, bottom switch, side switch, middle switch, right-angle rack, photomultiplier sleeve is a round tube, and the socket is fixed in the photomultiplier sleeve. The photomultiplier tube is inserted into the socket, and the left shaft and the right shaft are respectively fixed on the left end and the right end of the photomultiplier tube sleeve in such a way that their central axis coincides with the central axis of the photomultiplier tube sleeve, and the heads of the left shaft and the right shaft Two-thirds of the cylinder is truncated, the planes of the heads of the left shaft and the right shaft parallel to the respective central axes are parallel to the light-receiving surface of the photomultiplier tube, and the left cover and the right cover are separated by their central axes. It is fixed on the left and right ends of the photomultiplier tube sleeve in a way that coincides with the central axis of the left shaft and the right shaft. There is a gap on the outer wall of the photomultiplier tube rotation sleeve. On the right end of the sleeve, the gear of the photomultiplier tube rotating sleeve is set on the right end of the photomultiplier tube rotating sleeve, the left shaft sleeve and the right shaft sleeve are respectively sleeved on the left shaft and the right shaft, and the right end of the photomultiplier tube sleeve has a trigger screw frame , the central plane of the trigger screw frame passes through the central axis of the photomultiplier sleeve, the trigger screw frame is equipped with a side switch trigger screw and a bottom switch trigger screw, and the bottom switch is fixed on the left L-shaped hole on the right surface of the left track plate Above the horizontal arm of the left track plate, the side switch is fixed on the upper left of the vertical arm of the left L-shaped hole on the right surface of the left track plate, and the neutral switch is fixed on the horizontal arm of the left L-shaped hole on the right surface of the left track plate At the bottom left of the confluence with the vertical arm, the photomultiplier tube assembly is located in the left L-shaped hole and the right L-shaped hole with its left bushing and right bushing respectively, and the left and right shafts are connected from the left L-shaped hole and the right L-shaped hole respectively. The way of passing through the shaped hole spans between the left track plate and the right track plate, and the ends of the left shaft and the right shaft pass through the cotter pin and the right conveyor belt in a way that the central axes of the left shaft and the right shaft are perpendicular to the left conveyor belt and the right conveyor belt respectively. The left conveyor belt is connected with the right conveyor belt, and the right-angle rack is located at the confluence of the horizontal arm and the vertical arm of the two L-shaped holes with the photomultiplier tube sleeve, and the photomultiplier tube rotation sleeve just completely covers the light-receiving surface of the photomultiplier tube and rotates with the photomultiplier tube The gear meshing mode is fixed on the left surface of the right track plate.

Compared with background technology, the present invention has the following advantages:

1. The mobile device of the present invention ensures that two measurement windows can be opened on the electrochemiluminescence measurement cell, and provides detection equipment for realizing the electrochemiluminescence detection of different materials, different electrode forms and multi-electrodes.

2. Through the moving device of the present invention, a photomultiplier tube can be moved to the front of one of the two measurement windows as required. The photomultiplier tubes of all current ECL detectors are fixed. The invention reduces one photomultiplier tube and reduces the manufacturing cost of the instrument.

3. The single-chip microcomputer is used to control the work of the DC motor, which improves the precision and ensures the stable performance of the DC motor at low speed.

4. Replacing the traditional stepping motor with a DC motor helps to further reduce the manufacturing cost of the instrument.

Description of drawings

Fig. 1 is a right view structural diagram of a part of the moving mechanism of the photomultiplier tube moving device of the present invention. In the figure, 2 is the transmission shaft, 3 is the right driving gear, 4 is the right pressure wheel, 5 is the right middle pulley, 6 is the upper right pulley, 7 is the right conveyor belt, 8 is the right track plate, 9 is the right L-shaped hole, 10 It is side-lying dual-purpose electrochemiluminescence measurement pool, 11 is the bottom surface measurement window, 12 is the back measurement window, and 13 is the casing.

Fig. 2 is a left view structural diagram of a part of the moving mechanism of the photomultiplier tube moving device of the present invention. In the figure, 3' is the left driving gear, 4' is the left pressure wheel, 5' is the left middle pulley, 6' is the left upper pulley, 7' is the left conveyor belt, 8' is the left track plate, and 9' is the left L-shaped channel , 25 is a middle switch, 26 is a bottom switch, and 27 is a side switch.

Fig. 3 is a left view structural diagram of the moving mechanism of the photomultiplier tube moving device of the present invention, which is a structural schematic diagram of a part of the moving mechanism located on the right side of the right-angle rack 14 in Fig. 4 . In the figure, 14 is a right-angle rack, 15 is a photomultiplier tube rotating sleeve gear, 16 is a photomultiplier tube rotating sleeve, 17 is a window, 18 is a light-receiving surface of a photomultiplier tube, 21 is a photomultiplier tube sleeve, and 24 is a photomultiplier The photomultiplier tube sleeve 21 is located at the confluence of the horizontal and vertical arms of the two L-shaped holes, and the photomultiplier tube rotation sleeve 16 just completely covers the light-receiving surface 18 of the photomultiplier tube.

Fig. 4 is the front view structural representation of the moving mechanism of photomultiplier tube moving device of the present invention, among the figure, 1 is DC motor, and 19 is right shaft, and 19 ' is left shaft, and 20 is right axle sleeve, and 20 ' is left axle sleeve .

Fig. 5 is the front structural schematic view of the photomultiplier tube assembly of the photomultiplier tube moving device of the present invention, in the figure, 22 is a socket, 23 is a trigger screw rack, 231 is a side switch trigger screw, 232 is a bottom switch trigger screw, 28 is a right cover, and 28 ' is a left cover, and there is a longitudinal section at the A-A place.

Fig. 6 is a cross-sectional view at A-A in Fig. 5 .

Fig. 7 is a right view structural diagram of the photomultiplier tube assembly of the photomultiplier tube moving device of the present invention.

Detailed ways

The technical scheme and working principle of the present invention will now be described in detail in conjunction with the drawings and embodiments.

Example

A photomultiplier tube mobile device for a side-lying dual-purpose electrochemiluminescence measuring cell, which needs to be used in conjunction with a side-lying dual-purpose electrochemiluminescence measuring cell. The bottom surface and the back of the measuring cell 10 are respectively provided with bottom surface measurement windows 11 and Measuring window 12 on the back side, the DC motor 1 in the device works under the command and control of the single-chip microcomputer in the measuring pool 10, it is characterized in that the device is composed of a moving mechanism and a photomultiplier tube assembly, and the moving mechanism includes a DC motor 1, a deceleration Gear box, left driving gear 3', left middle pulley 5', left upper pulley 6', left pressure wheel 4', left conveyor belt 7', left track plate 8', drive shaft 2, right driving gear 3, right middle pulley 5 , upper right pulley 6, right pressure wheel 4, right conveyor belt 7, right track plate 8, left track plate 8' and right track plate 8 are respectively installed on the left and right sides of measuring pool 10, left track plate 8' and right track plate 8 are parallel to each other, the left track plate 8' and the right track plate 8 are parallel to the left and right sides of the measuring tank 10, and the transmission shaft 2 runs through the left track plate 8 in a manner orthogonal to the left track plate 8' and the right track plate 8 'and the right track plate 8, the left driving gear 3' and the right driving gear 3 are respectively fixed on the left end and the right end of the transmission shaft 2, and the middle left pulley 5', the upper left pulley 6' and the left pinch wheel 4' are installed on the On the left surface of the left track plate 8 ', the right middle pulley 5, the upper right pulley 6 and the right pinch wheel 4 are installed on the right surface of the right track plate 8 by their respective axles, respectively on the left track plate 8 ' and the right track plate 8 Left L-shaped channel 9' and right L-shaped channel 9 are arranged, and the plane formed by the center line of the vertical arm of the left L-shaped channel 9' and the center line of the vertical arm of the right L-shaped channel 9 is parallel to the back side of the measuring pool 10, The plane formed by the center line of the horizontal arm of the left L-shaped channel 9 ' and the center line of the horizontal arm of the right L-shaped channel 9 is parallel to the bottom surface of the measuring pool 10, the center line of the vertical arm of the left L-shaped channel 9 ' and the right The distance between the center line of the vertical arm of the L-shaped channel 9 and the back of the measuring pool 10 is equal to the center line of the horizontal arm of the left L-shaped channel 9 ' and the center line of the horizontal arm of the right L-shaped channel 9. The distance between the formed plane and the bottom surface of the measuring tank 10, the shaft of the DC motor 1 is connected to the left end of the transmission shaft 2 through the reduction gear box, the left conveyor belt 7' is set on the left driving gear 3', the left middle pulley 5', the upper left On the pulley 6' and the left pressure wheel 4', the left conveyor belt 7', the left driving gear 3', the left middle pulley 5', the left upper pulley 6' and the left pressure wheel 4' form a left L-shaped belt-wheel transmission mechanism, and the right conveyor belt 7 Set on the right driving gear 3, right middle pulley 5, right upper pulley 6 and right pressure pulley 4, the right conveyor belt 7, right driving gear 3, right middle pulley 5, right upper pulley 6 and right pressure pulley 4 form a right L-shaped belt -Wheel transmission mechanism, DC motor 1, reduction gearbox, left driving gear 3', left middle pulley 5', left upper pulley 6', left pressure wheel 4', left conveyor belt 7', left track plate 8', transmission shaft 2 , the right driving gear 3, the right middle pulley 5, the upper right pulley 6, the right pressure wheel 4, the right conveyor belt 7, and the right track plate 8 form a moving mechanism that the left conveyor belt 7' and the right conveyor belt 7 move in the same direction when the DC motor 1 rotates, Photomultiplier tube assembly with photoelectric Multiplier tube 24, socket 22, photomultiplier tube sleeve 21, left cover 28', right cover 28, photomultiplier tube rotation sleeve 16, photomultiplier tube rotation sleeve gear 15, left shaft 19', right shaft 19, left shaft Sleeve 20', right shaft sleeve 20, trigger screw frame 23, side switch trigger screw 231, bottom switch trigger screw 232, bottom switch 26, side switch 27, middle switch 25, right-angle rack 14, photoelectric multiplier Pipe sleeve 21 is a round pipe, and socket 22 is fixed in photomultiplier pipe sleeve 21, and photomultiplier tube 24 is inserted on the socket 22, and left shaft 19 ' and right shaft 19 are with the central axis of photomultiplier pipe sleeve 21 with their central axis. The overlapping mode is respectively fixed on the left end and the right end of the photomultiplier tube sleeve 21, two-thirds of the cylinders of the heads of the left shaft 19' and the right shaft 19 are cut off, and the heads of the left shaft 19' and the right shaft 19 The planes parallel to the respective central axes are parallel to the light-receiving surface 18 of the photomultiplier tube 24, and the left cover 28' and the right cover 28 coincide with the central axes of the left shaft 19' and the right shaft 19 respectively with their central axes The method is fixed on the left end and the right end of the photomultiplier tube cover 21, and there is a gap on the outer wall of the photomultiplier tube rotating cover 16, and the photomultiplier tube rotating cover 16 is set on the right end of the right cover 28 and the right end of the photomultiplier tube cover 21. The multiplier tube rotating sleeve gear 15 is set on the right end of the photomultiplier tube rotating sleeve 16, the left shaft sleeve 20' and the right shaft sleeve 20 are respectively sleeved on the left shaft 19' and the right shaft 19, and the right end of the photomultiplier tube sleeve 21 has Trigger screw frame 23, the central plane of trigger screw frame 23 passes through the central axis of photomultiplier tube sleeve 21, side position switch trigger screw rod 231 and bottom position switch trigger screw rod 232 are housed on the trigger screw rod frame 23, bottom position switch 26 is fixed on the left track Above the horizontal arm of the left L-shaped tunnel 9 ' on the right surface of the plate 8 ', the side position switch 27 is fixed on the upper left of the vertical arm of the left L-shaped tunnel 9 ' on the right surface of the left track plate 8 ', in the middle The position switch 25 is fixed on the left L-shaped channel 9 ' on the right surface of the left track plate 8 ', at the left lower part of the horizontal arm and the vertical arm confluence. Located in the left L-shaped tunnel 9' and the right L-shaped tunnel 9, and the left shaft 19' and the right shaft 19 pass through the left L-shaped tunnel 9' and the right L-shaped tunnel 9 respectively, and bridge the left track plate 8' Between the right track plate 8, the ends of the left shaft 19 ' and the right shaft 19 are respectively connected to the left conveyor belt through cotter pins in such a way that the central axis of the left shaft 19 ' and the right shaft 19 is perpendicular to the left conveyor belt 7 ' and the right conveyor belt 7 7' is connected to the right conveyor belt 7, and the right-angle rack 14 is located at the confluence of the horizontal arm and the vertical arm of the two L-shaped holes with the photomultiplier tube sleeve 21 and the photomultiplier tube rotation sleeve 16 just completely covers the light-receiving surface 18 of the photomultiplier tube 24 It is fixed on the left surface of the right track plate 8 in a manner of meshing with the photomultiplier tube rotating sleeve gear 15.

working principle.

1. Normally, the mobile device of this embodiment is in standby mode: the photomultiplier tube cover 21 is located at the confluence of the horizontal arm and the vertical arm of the two L-shaped channels, and the cylindrical surface of the photomultiplier tube cover 21 triggers the neutral switch 25, the neutral position The switch 25 is closed, the port connected to the single-chip microcomputer in the measuring cell 10 and the neutral switch 25 is set to 0, the single-chip microcomputer sends a command to cut off the power supply of the DC motor 1, the DC motor 1 does not work, and the photomultiplier tube rotating sleeve 16 just completely covers the photomultiplier tube 24 of the light-receiving surface 18.

2. When the user selects the "rear measurement window" through the keyboard, the single-chip microcomputer immediately executes the user's instruction, and sends out to provide electric energy with a suitable polarity to the DC motor 1, and the DC motor 1 works. On the one hand, the left conveyor belt 7' and the right conveyor belt 7 are pulled The photomultiplier tube sleeve 21 moves upward along the vertical arms of the two L-shaped holes. On the other hand, the photomultiplier tube rotating sleeve 16 moves upward along the vertical arm of the right-angle rack 14, and the photomultiplier tube rotating sleeve 16 rotates and gradually withdraws. Covering on the light-receiving surface 18 of the photomultiplier tube 24; when the photomultiplier tube cover 21 arrived at the top of the vertical arms of the two L-shaped holes, the side switch trigger screw 231 triggered the side switch 27, and the side switch 27 was closed, and the single-chip microcomputer and The port connected to the side switch 27 is set to 0, and the single-chip microcomputer sends an order to cut off the power supply of the DC motor 1, and the DC motor 1 does not work. Afterwards, the measurement pool 10 carries out the electrochemiluminescence detection through the measurement window 12 on the back side; when the detection is finished, the single-chip microcomputer sends out to provide the electric energy of the opposite polarity to the DC motor 1, and the DC motor 1 works. On the one hand, the left conveyor belt 7' and the right conveyor belt 7 Pull the photomultiplier tube cover 21 to move down along the vertical arms of the two L-shaped holes. Rotate in the opposite direction, and cover is gradually added on the light-receiving surface 18 of the photomultiplier tube 24; standby mode.

3. When the user selects the "bottom surface measurement window" through the keyboard, the subsequent circuit action is similar to the description in the previous paragraph, and so on, so it will not be repeated here.

Claims (1)

1. A photomultiplier tube moving device for a side-lying dual-purpose electrochemiluminescence measuring cell, which needs to be used in conjunction with a side-lying dual-purpose electrochemiluminescence measuring cell, and the bottom surface and the back of the measuring cell (10) are respectively provided with a bottom surface Measuring window (11) and back measuring window (12), the DC motor (1) in the device works under the command and control of the single-chip microcomputer in the measuring pool (10), it is characterized in that the device consists of a mobile mechanism and a photomultiplier Composed of pipe components, the moving mechanism includes DC motor (1), reduction gear box, left driving gear (3'), left middle pulley (5'), left upper pulley (6'), left pressure wheel (4'), left conveyor belt (7'), left track plate (8'), transmission shaft (2), right driving gear (3), right middle pulley (5), right upper pulley (6), right pressure roller (4), right conveyor belt (7 ), the right track plate (8), the left track plate (8 ') and the right track plate (8) are respectively installed on the left and right sides of the measuring pool (10), the left track plate (8 ') and the right track plate (8 ) are parallel to each other, the left track plate (8') and the right track plate (8) are parallel to the left and right sides of the measuring tank (10), and the drive shaft (2) is connected to the left track plate (8') and the right track plate (8) run through the left track plate (8') and the right track plate (8) in an orthogonal manner, the left driving gear (3') and the right driving gear (3) are respectively fixed on the left end and the right end of the drive shaft (2), Left middle pulley (5 '), left upper pulley (6 ') and left pinch pulley (4 ') are installed on the left surface of left track plate (8 ') by respective axles, right middle pulley (5), right upper pulley ( 6) and the right pressure roller (4) are installed on the right surface of the right track plate (8) through their respective shafts, and there are left L-shaped holes (9') on the left track plate (8') and the right track plate (8) respectively ) and the right L-shaped channel (9), the center line of the vertical arm of the left L-shaped channel (9 ') and the center line of the vertical arm of the right L-shaped channel (9) and the back side of the measuring pool (10) Parallel, the plane formed by the center line of the horizontal arm of the left L-shaped channel (9 ') and the center line of the horizontal arm of the right L-shaped channel (9) is parallel to the bottom surface of the measuring pool (10), and the left L-shaped channel (9 ') and the center line of the vertical arm of the right L-shaped channel (9) and the distance between the back of the measurement pool (10) is equal to the horizontal arm of the left L-shaped channel (9 ') The distance between the plane formed by the center line of the center line of the right L-shaped channel (9) and the center line of the horizontal arm of the right L-shaped channel (9) and the bottom surface of the measuring pool (10), the shaft of the DC motor (1) passes through the reduction gear box and the drive shaft (2 ), the left conveyor belt (7') is set on the left driving gear (3'), the left middle pulley (5'), the left upper pulley (6') and the left pinch wheel (4'), and the left conveyor belt (7' ), the left driving gear (3'), the left middle pulley (5'), the left upper pulley (6') and the left pressure pulley (4') form a left L-shaped belt-wheel transmission mechanism, and the right conveyor belt (7) is set on the right On the driving gear (3), right middle pulley (5), right upper pulley (6) and right pressure pulley (4), right conveyor belt (7), right driving gear (3), right middle pulley (5), right upper Pulley (6) and right pinch pulley (4) form right L-shaped belt-wheel transmission mechanism, DC motor (1), reduction gear box, left driving gear (3 '), left middle pulley (5 '), left upper pulley ( 6'), left pressure roller (4'), left conveyor belt (7'), left track plate (8'), transmission shaft (2), right driving gear (3), right middle pulley (5), right upper pulley ( 6), the right pressure roller (4), the right conveyor belt (7), and the right track plate (8) form a moving mechanism in which the left conveyor belt (7') and the right conveyor belt (7) move in the same direction when the DC motor (1) rotates, Photomultiplier tube assembly includes photomultiplier tube (24), socket (22), photomultiplier tube cover (21), left cover (28'), right cover (28), photomultiplier tube rotation cover (16), photoelectric Multiplier tube rotating sleeve gear (15), left shaft (19'), right shaft (19), left shaft sleeve (20'), right shaft sleeve (20), trigger screw frame (23), side switch trigger screw ( 231), bottom switch trigger screw rod (232), bottom switch (26), side switch (27), middle switch (25), right angle rack (14), photomultiplier tube cover (21) is a round tube , the socket (22) is fixed in the photomultiplier tube cover (21), the photomultiplier tube (24) is inserted on the socket (22), and the left shaft (19 ') and the right shaft (19) are connected to the photomultiplier with their central axis The mode that the central axis of pipe sleeve (21) overlaps is respectively fixed on the left end and the right end of photomultiplier pipe sleeve (21), and two-thirds of the cylinder of the head of left shaft (19 ') and right shaft (19) is covered by Cut off, the plane parallel to the respective central axis of the head of the left shaft (19 ') and the right shaft (19) is parallel to the light-receiving surface (18) of the photomultiplier tube (24), the left cover (28 ') and The right cover (28) is fixed on the left end and the right end of the photomultiplier tube cover (21) in such a way that their central axis coincides with the central axis of the left shaft (19 ') and the right shaft (19) respectively, and the photomultiplier tube rotating sleeve There is a gap on the outer wall of (16), the photomultiplier tube rotating sleeve (16) is sleeved on the right end of the right cover (28) and the right end of the photomultiplier tube sleeve (21), and the photomultiplier tube rotating sleeve gear (15) is sleeved on On the right end of the photomultiplier tube rotating sleeve (16), the left shaft sleeve (20') and the right shaft sleeve (20) are sleeved on the left shaft (19') and the right shaft (19) respectively, and the photomultiplier tube sleeve (21) There is a trigger screw frame (23) on the right end of the trigger screw frame (23), the center plane of the trigger screw frame (23) passes through the central axis of the photomultiplier sleeve (21), and the trigger screw frame (23) is equipped with a side switch trigger screw (231) and a bottom Bit switch triggers screw rod (232), and bottom position switch (26) is fixed on the top of the horizontal arm of left L-shaped channel (9 ') on the right surface of left track plate (8 '), and side position switch (27) is fixed on On the upper left of the vertical arm of the left L-shaped hole channel (9 ') on the right surface of the left track plate (8 '), the neutral position switch (25) is fixed on the left L-shaped hole on the right surface of the left track plate (8 '). The horizontal arm and vertical of the channel (9') At the bottom left of the junction of the straight arms, the photomultiplier tube assembly is located in the left L-shaped hole (9') and the right L-shaped hole (9) with its left bushing (20') and right bushing (20) and the left The shaft (19') and the right shaft (19) pass through the left L-shaped hole (9') and the right L-shaped hole (9) respectively, and bridge the left track plate (8') and the right track plate (8) Between, the end of left axle (19 ') and right axle (19) with the central axis of left axle (19 ') and right axle (19) and left conveyer belt (7 ') and right conveyer belt (7) vertical mode They are respectively connected to the left conveyor belt (7') and the right conveyor belt (7) through cotter pins, and the right-angle rack (14) is located at the confluence of the horizontal arm and the vertical arm of the two L-shaped channels with the photomultiplier sleeve (21) and the photomultiplier The tube rotating sleeve (16) is fixed on the left surface of the right track plate (8) in a manner of meshing with the photomultiplier rotating sleeve gear (15) when just covering the light-receiving surface (18) of the photomultiplier tube (24) completely.

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