Automatic sampling device of Kjeldahl apparatus

Abstract

The utility model relates to the technical field of instrument control, and discloses an automatic sample introduction device of a Kjeldahl azotometer, which comprises a frame, a bottom plate fixed at the bottom of the frame, side plates fixed at the left side and the right side of the frame, a back plate fixed at the rear part of the frame, and a support frame fixed at the upper part in the frame, a conversion device is arranged above the supporting frame, a sample introduction device is arranged above the conversion device, a cover is fixed to the right side of the top of the frame, and an azotometer body is fixed to the middle of the top of the cover. A conversion stepping motor rotates to drive a first lead screw to rotate, the first lead screw rotates to drive a third sliding block to move, and finally a Y-axis platform and an X-axis platform are driven to move, so that planar movement of the position of the digestion pipe is achieved, and a rotating motor rotates to easily drive a rotating disc to rotate under the cooperation of a middle bearing and an outer ring bearing. Therefore, after the samples in a group of digestion tubes are treated, the samples are switched by rotating 90 degrees anticlockwise.

Description

Technical Field

[0001] The utility model relates to the technical field of instrument control, and more specifically discloses an automatic sample injector for a Kjeldahl nitrogen analyzer. Background Art

[0002] A Kjeldahl nitrogen analyzer is an instrument that calculates the protein content by measuring the nitrogen content in a sample based on the principle that the nitrogen content in protein is constant. Since the method of measuring and calculating the protein content is called the Kjeldahl method, it is called a Kjeldahl nitrogen analyzer, also known as a nitrogen analyzer, a protein analyzer, and a crude protein analyzer. Currently, almost all Kjeldahl nitrogen analyzers use manual sample injection methods to inject samples. However, manual sample injection operations are inconvenient, inefficient, and occupy testing personnel. Moreover, analysts will inevitably come into contact with high temperatures and strong acids and alkalis, so there is a great risk.

[0003] In view of the above problems, the prior art (publication number: CN203465284U) discloses an automatic sampler for a Kjeldahl nitrogen analyzer, which includes a lifting table, a digestion tube rack, a left and right movable bracket, an X-axis positioning device, a Z-axis positioning device, and a controller. The central axis of the lifting table is connected to the controller by a stepping motor through a control cable. A pressure sensor is placed on the lifting table, and the pressure sensor is connected to the controller through a signal wire. The left and right movable brackets, the digestion tube rack, and the buckle are fixedly installed on the upper surface of the lifting table. The X-axis and Z-axis stepping motors are respectively connected to the controller through X-axis and Z-axis stepping motor control cables. There are three passageways, namely an alkali liquid pipeline, a steam pipeline, and a gas-liquid separation pipeline, inside the conical rubber head. The utility model realizes the automatic control of sample injection, gets rid of manual operation, avoids the confusion of data, saves a large amount of labor and time, and avoids manual contact with high temperatures and strong acids and alkalis, enhancing the operation safety; there is no need to transfer samples, effectively avoiding the corrosion of pipelines and instruments by high temperatures and strong acids during the sample transfer process.

[0004] However, during the use of the above device, the controller can control the lifting table to lift the entire digestion tube placed on the lifting table for automatic sample injection. However, this sample injection method can only move the entire digestion tubes on the lifting table up or down, while only one digestion tube is actually needed for sampling, resulting in a large amount of energy waste and high energy consumption. Summary of the Utility Model

[0005] The main technical problem to be solved by the utility model is to provide an automatic sample injector for a Kjeldahl nitrogen analyzer, which can solve the problem that all the digestion tubes on the lifting table move up or down as a whole, while only one digestion tube is actually needed for sampling, resulting in a large amount of energy waste and high energy consumption.

[0006] To solve the above technical problems, according to one aspect of the present utility model, more specifically, it is an automatic sample injection device for a Kjeldahl nitrogen analyzer, including a frame. A bottom plate is fixed to the bottom of the frame. Side plates are fixed to the left and right sides of the frame. A back plate is fixed to the rear of the frame. A support frame is fixed above the interior of the frame. A conversion device is provided above the support frame. A sample injection device is provided above the conversion device. A cover is fixed to the right side of the top of the frame. A Kjeldahl nitrogen analyzer main body is fixed in the middle of the top of the cover.

[0007] Furthermore, the conversion device includes a Y-axis platform. First sliders are fixed at the top corners of the Y-axis platform. First slider tracks are fixed at the front and rear of the top of the support frame. The first sliders are inserted into the outer walls of the first slider tracks. Second slider tracks are fixed to the left and right sides of the top of the Y-axis platform. Second sliders are inserted into the front and rear of the upper outer walls of the second slider tracks. A group of first crossbars are jointly fixed to the middle of the left and right inner walls of the X-axis platform. A second crossbar is fixed to the right side of the bottom of the support frame. A third crossbar is fixed to the rear of the bottom of the Y-axis platform. Stepper motor bases are fixed to the front of the top of the second crossbar and the left side of the top of the third crossbar. Motor fixing blocks are fixed to the rear side of the upper stepper motor base and the right side of the lower stepper motor base. Conversion stepper motors are fixed to the rear side of the upper motor fixing block and the right side of the lower motor fixing block. The output shaft of the stepper motor is fixed with a first lead screw on the side away from the conversion stepper motor of the motor fixing block. A first stop block is penetrated through the outer wall of the first lead screw near the conversion stepper motor. The outer wall of the first lead screw is rotatably connected with a second stop block on the side away from the conversion stepper motor. The bottoms of the first stop block and the second stop block are both fixed to the top of the stepper motor base. A third slider is threadedly connected to the middle of the outer wall of the first lead screw. The top of the lower third slider is fixed to the front right of the bottom of the Y-axis platform. The top of the upper third slider is fixed to the bottom left of the front first crossbar.

[0008] Further, for the sample injection device fixing rod, a sliding rod is fixed in the middle of the front surface of the fixing rod. An installation frame is fixed above the front surface of the sliding rod. A lifting stepping motor is fixed on the top of the installation frame. The lower end of the output shaft of the lifting stepping motor is fixed with a second lead screw. A fourth slider is threadedly connected to the outer wall of the second lead screw. The rear part of the fourth slider is inserted into the outer wall of the sliding rod. The middle of the front surface of the fourth slider is fixed with a first support arm. Above the front part of the outer wall of the first support arm is fixed with a second support arm. A top head is fixed on the top of the second support arm. A backing plate is fixed on the top of the X-axis platform. An opening is provided above the top of the backing plate and above the top head. A middle bearing is fixed in the middle of the top of the backing plate. Outer ring bearings are fixed around the top of the backing plate. A rotary stepping motor is jointly fixed in the middle of the bottoms of the two first cross bars. The output shaft of the rotary stepping motor is fixed with a turntable above the middle bearing. Four groups of through holes are provided on the top of the turntable. Above the turntable and above each group of through holes is provided a digestion tube rack. A plurality of digestion tubes are provided inside the digestion tube rack.

[0009] Further, the top of the middle bearing and the top of the outer ring bearing are both in contact with the bottom of the turntable.

[0010] Further, the through holes correspond to the digestion tubes one by one.

[0011] The beneficial effects of the automatic sample injection device of the Kjeldahl nitrogen analyzer of the present utility model are as follows: The rotation of the conversion stepping motor drives the rotation of the first lead screw. The rotation of the first lead screw drives the movement of the third slider, and finally drives the movement of the Y-axis platform and the X-axis platform, so as to realize the planar movement of the position of the digestion tube. The rotation of the rotation motor can easily drive the rotation of the turntable under the cooperation of the middle bearing and the outer ring bearing, so as to rotate 90° counterclockwise to switch samples after processing the samples in a group of digestion tubes. The rotation of the lifting stepping motor drives the rotation of the second lead screw. The rotation of the second lead screw drives the up and down movement of the fourth slider. The up and down movement of the top head is driven through the first support arm and the second support arm, and finally the automatic sample injection of the digestion tube is realized through the top head. Description of the Drawings

[0012] The following further elaborates on the present utility model in detail in conjunction with the drawings and specific implementation methods.

[0013] Figure 1 It is a schematic diagram of the overall structure of the device;

[0014] Figure 2 It is a schematic diagram of the structures of the X-axis platform and the Y-axis platform;

[0015] Figure 3 It is a schematic diagram of the structures of the X-axis platform and the backing plate;

[0016] Figure 4It is a schematic structural diagram of a turntable and a digestion tube rack;

[0017] Figure 5 It is a schematic structural diagram of a slide bar part.

[0018] In the figure: 1. Frame; 2. Bottom plate; 3. Side plate; 4. Back plate; 5. Support block; 6. Conversion device; 7. Sampling device; 8. Cover; 9. Kjeldahl distillation apparatus main body; 10. Second cross bar; 11. Stepper motor base; 12. Motor fixing block; 13. Conversion stepper motor; 14. First stop block; 15. First lead screw; 16. Third slider; 17. Second stop block; 18. First slider track; 19. Y-axis platform; 20. First slider; 21. Second slider track; 22. Second slider; 23. X-axis platform; 24. Third cross bar; 25. First cross bar; 26. Rotary stepper motor; 27. Pad; 28. Outer ring bearing; 29. Intermediate bearing; 30. Turntable; 31. Through hole; 32. Digestion tube rack; 33. Digestion tube; 34. Fixed rod; 35. Slide bar; 36. Lifting stepper motor; 37. Second lead screw; 38. Fourth slider; 39. First arm; 40. Second arm; 41. Top head; 42. Mounting bracket; 43. Opening. Specific embodiments

[0019] The present invention will be described in detail below with reference to the drawings and in conjunction with embodiments. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0020] According to one aspect of the present invention, as Figures 1-5 shown, a Kjeldahl distillation apparatus automatic sampling device is provided, including a frame 1, a bottom plate 2 is fixed at the bottom of the frame 1, side plates 3 are fixed on the left and right sides of the frame 1, a back plate 4 is fixed at the rear of the frame 1, a support frame 5 is fixed above the interior of the frame 1, a conversion device 6 is provided above the support frame 5, a sampling device 7 is provided above the conversion device 6, a cover 8 is fixed on the right side of the top of the frame 1, and a Kjeldahl distillation apparatus main body 9 is fixed in the middle of the top of the cover 8. The position of the digestion tube can be moved horizontally through the conversion device 6, and automatic sampling of the digestion tube and switching of each group of digestion tubes 33 can be achieved through the sampling device 7.

[0021] The conversion device 6 includes a Y-axis platform 19. At the top corners of the Y-axis platform 19, a first slider 20 is fixed. On the front and rear sides of the top of the support frame 5, first slider rails 18 are fixed. The first slider 20 is inserted into the outer wall of the first slider rail 18. On the left and right sides of the top of the Y-axis platform 19, second slider rails 21 are fixed. On the front and rear sides of the upper outer wall of the second slider rail 21, second sliders 22 are inserted. The tops of the four second sliders 22 are jointly fixed to an X-axis platform 23. In the middle of the left and right inner walls of the X-axis platform 23, a group of first crossbars 25 are jointly fixed. On the right side of the bottom of the support frame 5, a second crossbar 10 is fixed. On the rear of the bottom of the Y-axis platform 19, a third crossbar 24 is fixed. On the front of the top of the second crossbar 10 and on the left side of the top of the third crossbar 24, stepper motor bases 11 are fixed. On the rear side of the upper stepper motor base 11 and on the right side of the lower stepper motor base 11, motor fixing blocks 12 are fixed. On the rear side of the upper motor fixing block 12 and on the right side of the lower motor fixing block 12, conversion stepper motors 13 are fixed. On the side of the motor fixing block 12 away from the conversion stepper motor 13, a first lead screw 15 is fixed to the output shaft of the stepper motor 13. On the side of the first lead screw 15 close to the conversion stepper motor 13, a first stop block 14 is sleeved. On the side of the first lead screw 15 away from the conversion stepper motor 13, a second stop block 17 is rotatably connected. The bottoms of the first stop block 14 and the second stop block 17 are both fixed to the top of the stepper motor base 11. In the middle of the outer wall of the first lead screw 15, a third slider 16 is threadedly connected. The top of the lower third slider 16 is fixed to the front right of the bottom of the Y-axis platform 19. The top of the upper third slider 16 is fixed to the bottom left of the front first crossbar 25. When the conversion stepper motor 13 rotates, it drives the first lead screw 15 to rotate. When the first lead screw 15 rotates, it drives the third slider 16 to move, and finally drives the Y-axis platform 19 and the X-axis platform 23 to move.

[0022] The sample injection device 7 is fixed to the fixed rod 34. In the middle of the front surface of the fixed rod 34, a sliding rod 35 is fixed. Above the front surface of the sliding rod 35, a mounting frame 42 is fixed. At the top of the mounting frame 42, a lifting stepper motor 36 is fixed. At the lower end of the output shaft of the lifting stepper motor 36, a second lead screw 37 is fixed. The outer wall of the second lead screw 37 is threadedly connected with a fourth slider 38. The rear part of the fourth slider 38 is inserted into the outer wall of the sliding rod 35. In the middle of the front surface of the fourth slider 38, a first support arm 39 is fixed. Above the front part of the outer wall of the first support arm 39, a second support arm 40 is fixed. At the top of the second support arm 40, a top head 41 is fixed. A backing plate 27 is fixed to the top of the X-axis platform 23. An opening 43 is formed in the top of the backing plate 27 above the top head 41. In the middle of the top of the backing plate 27, an intermediate bearing 29 is fixed. Around the top of the backing plate 27, an outer ring bearing 28 is fixed. In the middle of the bottom of the two first crossbars 25, a rotary stepper motor 26 is jointly fixed. Above the intermediate bearing 29, a turntable 30 is fixed to the output shaft of the rotary stepper motor 26. Four groups of through holes 31 are formed in the top of the turntable 30. Above the turntable 30 and above each group of through holes 31, a digestion tube rack 32 is provided. A plurality of digestion tubes 33 are arranged inside the digestion tube rack 32. When the rotary motor 26 rotates, with the cooperation of the intermediate bearing 29 and the outer ring bearing 28, the turntable 30 can be easily driven to rotate, so as to switch the sample counterclockwise by 90° after processing the sample in a group of digestion tubes 33. When the lifting stepper motor 36 rotates, it drives the second lead screw 37 to rotate. The rotation of the second lead screw 37 drives the fourth slider 38 to move up and down. The top head 41 is driven to move up and down through the first support arm 39 and the second support arm 40. Finally, the automatic sample injection of the digestion tube 33 is realized through the top head 41.

[0023] The top of the intermediate bearing 29 and the top of the outer ring bearing 28 are both in contact with the bottom of the turntable 30, ensuring that the intermediate bearing 29 and the outer ring bearing 28 can cooperate with the turntable 30, so that the turntable 30 can be easily rotated driven by the rotary motor 26.

[0024] The through holes 31 correspond to the digestion tubes 33 one by one, ensuring that each digestion tube 33 has a corresponding through hole 31 for cooperation.

[0025] Certainly, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by those of ordinary skill in the art within the scope of the essence of the present invention also belong to the protection scope of the present invention.

Claims

1. An automatic sample introduction device for a Kjeldahl nitrogen analyzer, comprising a frame (1), characterized in that: A bottom plate (2) is fixed to the bottom of the frame (1), side plates (3) are fixed to the left and right sides of the frame (1), a back plate (4) is fixed to the rear of the frame (1), a support frame (5) is fixed to the upper part of the interior of the frame (1), a conversion device (6) is provided above the support frame (5), a sample introduction device (7) is provided above the conversion device (6), a cover (8) is fixed to the right side of the top of the frame (1), and a nitrogen analyzer body (9) is fixed in the middle of the top of the cover (8).

2. The automatic sample introduction device for Kjeldahl nitrogen analyzer according to claim 1, characterized in that: The conversion device (6) comprises a Y-axis platform (19), a first slider (20) is fixed at the top corner of the Y-axis platform (19), first slider rails (18) are fixed at the front and rear sides of the top of the support frame (5), the first slider (20) is plugged into the outer wall of the first slider rail (18), second slider rails (21) are fixed at the left and right sides of the top of the Y-axis platform (19), second sliders (22) are plugged into the front and rear sides of the upper outer wall of the second slider rail (21), and four second sliders (2 2) is commonly fixed with an X-axis platform (23) at the top, a group of first cross bars (25) is commonly fixed at the middle of the left and right inner walls of the X-axis platform (23), a second cross bar (10) is fixed at the right bottom of the support frame (5), a third cross bar (24) is fixed at the rear bottom of the Y-axis platform (19), a stepper motor base (11) is fixed at the front of the top of the second cross bar (10) and the left of the top of the third cross bar (24), and the rear side of the upper stepper motor base (11) and the lower stepper motor base ( A motor fixing block (12) is fixed on the right side of the upper motor fixing block (11), a conversion stepping motor (13) is fixed on the rear side of the upper motor fixing block (12) and the right side of the lower motor fixing block (12), an output shaft of the stepping motor (13) is located on the side of the motor fixing block (12) away from the conversion stepping motor (13) and a first screw rod (15) is fixed thereon, a first stopper (14) is penetrated on the outer wall of the first screw rod (15) on the side close to the conversion stepping motor (13), and the first screw rod (15) is A second stopper (17) is rotatably connected to the side of the outer wall away from the conversion stepper motor (13); the bottom of the first stopper (14) and the bottom of the second stopper (17) are both fixed to the top of the stepper motor base (11); a third slider (16) is threadedly connected to the middle of the outer wall of the first screw rod (15); the top of the third slider (16) at the bottom is fixed to the front right side of the bottom of the Y-axis platform (19); and the top of the third slider (16) at the top is fixed to the left side of the bottom of the first horizontal bar (25) in front.

3. The automatic sample introduction device for Kjeldahl nitrogen analyzer according to claim 2, characterized in that: The sample injection device (7) is provided with a fixed rod (34), a sliding rod (35) is fixed to the middle of the front surface of the fixed rod (34), a mounting frame (42) is fixed above the front surface of the sliding rod (35), a lifting stepping motor (36) is fixed to the top of the mounting frame (42), a second screw rod (37) is fixed to the lower end of the output shaft of the lifting stepping motor (36), a fourth sliding block (38) is threadedly connected to the outer wall of the second screw rod (37), the rear part of the fourth sliding block (38) is plugged into the outer wall of the sliding rod (35), a first support arm (39) is fixed to the middle of the front surface of the fourth sliding block (38), a second support arm (40) is fixed above the front part of the outer wall of the first support arm (39), a top head (41) is fixed to the top of the second support arm (40), and the X A pad (27) is fixed on the top of the shaft platform (23), and an opening (43) is provided on the top of the pad (27) above the top head (41). An intermediate bearing (29) is fixed in the middle of the top of the pad (27), and outer ring bearings (28) are fixed around the top of the pad (27). A rotating stepper motor (26) is fixed in the middle of the bottom of the two first horizontal bars (25). The output shaft of the rotating stepper motor (26) is located above the intermediate bearing (29) and a turntable (30) is fixed thereon. Four groups of through holes (31) are provided on the top of the turntable (30), and a digestion tube rack (32) is provided above each group of through holes (31). A plurality of digestion tubes (33) are provided inside the digestion tube rack (32).

4. The automatic sample introduction device for Kjeldahl nitrogen analyzer according to claim 3, characterized in that: The top of the intermediate bearing (29) and the top of the outer ring bearing (28) are both in contact with the bottom of the rotating disk (30).

5. The automatic sample introduction device for Kjeldahl nitrogen analyzer according to claim 3, characterized in that: The through holes (31) correspond one to one with the digestion tubes (33).

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