Constant weight method multi-station moisture detection device and detection method

Abstract

The invention discloses a constant weight method multi-station moisture detection device and a detection method, belongs to the technical field of measuring instruments, is used for moisture detection of food, grain and traditional Chinese medicine, and comprises a bracket shell assembly, a windproof shock isolation balance assembly, a constant temperature and humidity unit, a heating and cooling drying assembly, a sample transfer mechanism, a sample adding mechanism and a control unit, the support shell assembly is provided with a drying and drying chamber, a heat insulation layer and a constant-temperature and constant-humidity balance chamber from top to bottom. A balance module in the windproof shock-isolation balance assembly is arranged in a constant-temperature and constant-humidity balance chamber, a weighing rod of the balance module is positioned in a drying and drying chamber, and a sample transfer mechanism and a heating and cooling drying assembly are arranged in the drying and drying chamber; the sample transfer mechanism can realize sample bearing, sample transfer, bottle cap opening and closing and accurate weighing; the rotation of the sample disc can also enable heating drying and cooling drying to be more uniform, and the sample disc can be linked and matched with a sample adding mechanism to complete accurate sample adding; and the control unit is linked with each component to realize full-process automatic detection.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of measuring instruments, and particularly relates to a constant weight method multi-station moisture detection device and a detection method. BACKGROUND

[0002] As a classic laboratory analysis method in the field of food, grain and traditional Chinese medicine moisture detection, the constant weight method is widely used in food production quality control, safety detection and scientific research experiments due to its mature principle and high data reliability. It is one of the key technical means to ensure food quality and safety. In recent years, with the scale development of the food industry and the continuous improvement of detection precision requirements, food moisture detection technology based on the constant weight method has become an important research direction in the industry.

[0003] The core principle of the constant weight method for detecting food moisture is to remove the water in the food sample by drying, and to calculate the moisture content according to the weight difference before and after drying. The traditional operation needs to rely on the cooperation of an oven, a dryer and a balance. The technician needs to monitor the drying temperature in real time. After the sample is dried, it is transferred to the dryer for cooling, and then the dryer is transported to the balance room for weighing. In order to ensure data accuracy, each experiment needs to repeat this process at least 4 times to realize constant weight verification.

[0004] However, the current technology application in the field of food moisture detection has obvious shortcomings. On the one hand, the traditional constant weight method completely relies on manual operation, which is tedious and time-consuming. The operation standard of the technician and the environmental interference (such as temperature and humidity fluctuations, external impurity adsorption) during sample transfer will affect the accuracy of the detection result. At the same time, manual data recording is prone to errors and cannot meet the demand for traceability of experimental data. On the other hand, the automatic detection instruments developed in recent years are mainly based on single-station drying method, using infrared or halogen lamp heating method. Although the weighing speed is improved, the detection accuracy is low due to the limitation of single-station design and simplified heating and temperature control logic. It is only suitable for non-high-precision detection scenes in the field and cannot meet the high-precision analysis needs of the laboratory level.

[0005] The existing detection technology and equipment generally have low automation degree and incomplete process control. They lack precise control of the balance weighing environment (such as constant temperature and humidity stability, vibration isolation, electrostatic protection), which leads to weighing data susceptible to external interference. They also cannot realize the intelligent connection of the whole process such as sample drying, cooling drying, automatic transfer weighing, constant weight judgment, and lack effective solutions for the influence of condensate water during sample cooling and external moisture interference. At the same time, it is difficult to automatically complete data collection, out-of-tolerance judgment and result calculation, and cannot truly solve the core needs of high precision, automation, intelligence and data traceability in the field of food moisture detection.

[0006] In summary, there is an urgent need for a multi-station, full-process automated constant weight method moisture detection device in the field to solve the problems of insufficient detection accuracy, low efficiency, high dependence on manual operation, poor data traceability and other problems in the prior art, and to meet the urgent needs of the food industry for high-quality moisture detection. SUMMARY

[0007] The purpose of the present application is to solve the above problems, and provide a constant weight method multi-station moisture detection device and detection method.

[0008] A constant weight method multi-station moisture detection device comprises:

[0009] A support shell assembly, a windproof shock isolation balance assembly, a constant temperature and humidity unit, a heating and cooling drying assembly, a sample transfer mechanism, a sample adding mechanism and a control unit;

[0010] The support shell assembly comprises, from top to bottom, a drying and drying chamber, a heat insulation layer, and a constant temperature and humidity balance chamber;

[0011] The heating and cooling drying assembly is arranged in the drying and drying chamber, and the constant temperature and humidity balance chamber is in communication with the constant temperature and humidity unit;

[0012] The windproof shock isolation balance assembly comprises a balance module, an independent balance shock isolation mounting table and a balance windproof assembly;

[0013] The independent balance shock isolation mounting table is not in contact with the support shell assembly, and the lower end thereof is fixedly connected to the ground, and the balance module arranged on the upper end thereof is located in the constant temperature and humidity balance chamber;

[0014] The balance module comprises a balance weighing rod and a sample weighing support disc at the upper end of the balance weighing rod, and the balance weighing rod penetrates the heat insulation layer upward into the drying and drying chamber;

[0015] The sample transfer mechanism comprises a weighing bottle body, a weighing bottle cap, a sample disc, a bottle cap opening and closing disc, a sample disc rotating and lifting assembly, and a bottle cap opening and closing disc lifting assembly;

[0016] The sample transfer mechanism is installed in the middle part of the support shell assembly through a base, a slide rail support is fixedly connected to the base, and a slide block support is slidably connected to the slide rail support;

[0017] N stepped positioning grooves are uniformly distributed on the circumference of the sample disc, and are matched and positioned with the positioning bosses on the lower side of the weighing bottle body;

[0018] An up-down sliding structure is arranged between the bottle cap opening and closing disc and the sample disc, and the bottle cap opening and closing disc is limited to slide downward by the limiting column on the upper end surface of the sample disc;

[0019] A connecting column and a large conical surface limiting table are sequentially arranged on the upper end of the weighing bottle cap;

[0020] The bottle cap opening and closing disc is evenly distributed with n small conical groove slots, the connecting column passes through the small conical groove slot and does not contact it, and the large conical surface limiting table is larger than the small conical groove slot;

[0021] When the bottle cap is closed with the weighing bottle body, the large conical surface limiting table does not contact the small conical groove slot, when the bottle cap opening and closing disc slides upward relative to the sample disc, the large conical surface limiting table contacts the small conical groove slot, and the bottle cap opening and closing disc drives the weighing bottle cap to separate upward from the weighing bottle body.

[0022] The sample disc rotating and lifting assembly includes a synchronous pulley rotating assembly and a cam reciprocating lifting assembly;

[0023] The synchronous pulley rotating assembly includes a rotating motor, a small pulley, a large pulley, a synchronous belt, a bearing seat, a rotating hollow rod, and an angle sensor;

[0024] The bearing seat is installed on one side of the sliding block support, and the rotating hollow rod is connected to the bearing seat;

[0025] The rotating hollow rod is provided with an angle sensor at the lower end, is fixedly connected to the sample disc at the upper end, and is sleeved with the large pulley at the middle part;

[0026] The rotating motor is fixed on the other side of the sliding block support, and the output shaft is fixedly connected to the small pulley;

[0027] The small pulley and the large pulley are connected through the synchronous belt;

[0028] The position where the rotating hollow rod passes through the heat insulation layer is sealingly sleeved with a rear sealing sleeve;

[0029] The cam reciprocating lifting assembly includes a lifting motor, an eccentric cam, a top block, and a displacement sensor;

[0030] The lifting motor is fixed on the sliding rail support, and the output shaft is fixedly connected to the eccentric cam; the top block is arranged at the lower end of the sliding block support and is subjected to gravity, and the top block is always in contact with the eccentric cam;

[0031] The displacement sensor is arranged between the sliding rail support and the sliding block support, and the eccentric cam drives the sliding block support to slide up and down;

[0032] Only the cam reciprocating lifting assembly is replaced by a crank pin sliding groove reciprocating lifting assembly, that is, the eccentric cam and the top block are replaced by a pin crank and a vertical guide sleeve, and the remaining structures are not changed;

[0033] The pin crank is fixedly connected to the output shaft of the lifting motor, and the vertical guide sleeve is fixedly connected to the lower end of the sliding block support; a horizontal sliding groove is arranged on the vertical guide sleeve, a pin is arranged on the pin crank, and the pin slides in the sliding groove to drive the sliding block support to move up and down.

[0034] The bottle cap opening and closing disc lifting assembly comprises an electric telescopic cylinder, an electric telescopic rod and a ball head top support table;

[0035] The electric telescopic cylinder is fixed on the base and can drive the electric telescopic rod to move up and down.

[0036] The electric telescopic rod passes through the rotating hollow rod and does not contact the rotating hollow rod.

[0037] The top end of the electric telescopic rod is fixed with the ball head top support table, and a plurality of ball head tops are arranged on the ball head top support table.

[0038] The ball head top rolls with the lower end surface of the bottle cap opening and closing disc.

[0039] The heating and cooling drying assembly comprises, from the outside to the inside, a long shaft fan, a heating pipe, a finned tube heat exchange unit and an embedded drying unit.

[0040] The finned tube heat exchange unit comprises a heat exchange pipe, heat exchange fins and a circulating cooling water system.

[0041] The upper end of the drying and drying chamber is provided with a ventilation valve, the ventilation valve is opened in the temperature rising drying stage, and the ventilation valve is closed at the end of the temperature decreasing drying stage.

[0042] The sample adding mechanism comprises a rotary lifter and a sample adding elbow piece.

[0043] The sample adding elbow piece comprises an openable and closable feeding port, a hollow vertical pipe and a lower inner elbow pipe from top to bottom.

[0044] The rotary lifter can drive the hollow vertical pipe to rotate and move up and down, and is used for adding samples into the weighing bottle body.

[0045] The sample weighing support disc is located on the lower side of the sample disc, and when weighing, it can pass through the stepped positioning groove to simultaneously lift the weighing bottle cap and the weighing bottle body for weighing.

[0046] The balance windproof assembly comprises an upper balance windproof cover and a lower balance windproof cover which are sleeved on the outer side of the balance weighing rod.

[0047] The upper end of the upper balance windproof cover is connected with the upper wall plate of the constant temperature and humidity balance chamber, and the lower balance windproof cover is connected with the upper end surface of the balance module, the two are sleeved and sealed, and at least one is made of flexible material.

[0048] Another object of the present application is to provide a constant weight method multi-station moisture detection method.

[0049] A constant weight method multi-station moisture detection method adopts the constant weight method multi-station moisture detection device, and the specific use steps are as follows:

[0050] Step S1: turn on the equipment and set the parameters.

[0051] Step S2: Put n empty weighing bottle bodies into the step positioning slots of the sample disc in turn, and hang n weighing bottle caps on the small conical surface slots of the bottle cap opening and closing disc in turn. At this time, the weighing bottle body and the weighing bottle cap are in a separated state, and the positions of the weighing bottle bodies are numbered;

[0052] Step S3: Start the experiment, and the control unit starts to work. The rotating motor in the synchronous belt wheel rotating assembly drives the sample disc to rotate. The ventilation valve is opened, the heating pipe is heated, and the long shaft fan is started;

[0053] Step S4: After reaching the set time, the electric telescopic rod in the bottle cap opening and closing disc lifting assembly is retracted, the bottle cap opening and closing disc is lowered to the limit column, the weighing bottle cap is closed with the weighing bottle body, at this time, the weighing bottle cap is not in contact with the bottle cap opening and closing disc, the heating pipe stops heating, and the drying is completed;

[0054] Step S5: Start cooling, the circulating cooling water system provides cold water into the finned tube heat exchange unit, the long shaft fan keeps rotating, the drying and drying chamber is rapidly cooled, and the ventilation valve is closed when the temperature is cooled to the set temperature, and the drying is completed;

[0055] Step S6: Start weighing, and the synchronous belt wheel rotating assembly controls the weighing bottle body at position No. 1 to be positioned above the sample support disc. Then, the cam reciprocating lifting assembly or the crank pin sliding groove reciprocating lifting assembly controls the sample disc to be lowered to the specified position. At this time, the sample support disc lifts the weighing bottle body and the weighing bottle cap, and after the balance value is stable, the data is transmitted to the upper computer. The crank pin sliding groove reciprocating lifting assembly controls the sample disc to rise and return to the initial position;

[0056] Step S7: Then, the weighing bottle body at position No. 2 is weighed, and the action of step S6 is repeated until the weighing work at position No. 2 is completed. The electric telescopic rod is extended to lift the bottle cap opening and closing disc and the weighing bottle cap thereon;

[0057] Step S8: Repeat the steps S3-S7 until the constant weight is achieved;

[0058] Step S9: Add sample, and the synchronous belt wheel rotating assembly controls the sample disc to rotate. The rotary lifter controls the sample adding elbow to add sample into the weighing bottle bodies at positions No. 1-20 in turn;

[0059] Step S10: Control the weighing bottle cap to close with the weighing bottle body, and the automatic weighing at positions No. 1-20. The balance data is automatically recorded to the upper computer; Step S11: Repeat S3-S7 until the constant weight is achieved, automatically calculate the data and export, and the control unit closes the equipment.

[0060] The application provides a multi-station food grain traditional Chinese medicine moisture detection device and a detection method thereof, and belongs to the technical field of measuring instruments.

[0061] Compared with the prior art, the technical scheme adopted by the application has the following beneficial effects:

[0062] 1. Multi-station design combined with full-process automation greatly improves detection efficiency and data reliability: 20 sample disc stations are provided, and precise indexing and lifting components are matched to realize full-process automation, which can improve the efficiency by more than 20 times, avoid manual operation errors, and realize automatic data tracing.

[0063] 2. High-precision weighing environment control system solves the core pain point that the weighing data of traditional equipment is easily disturbed: a weighing environment with constant temperature and humidity, three-stage shock isolation, and flexible windproof is constructed to isolate interference, ensure weighing precision, and meet the laboratory high-precision detection requirements.

[0064] 3. Oven-drying-cooling-drying temperature control system effectively avoids sample condensate water interference and guarantees detection accuracy: oven-drying-cooling-drying temperature control, rapid cooling without condensate water, built-in drying agent to remove moisture, ensure stable drying of samples, and improve data reliability.

[0065] 4. Self-adaptive sample bearing and intelligent opening and closing cover design compatible with multiple specifications of samples and avoiding secondary pollution: a stepped positioning groove is adapted to multiple specifications of weighing bottles, and an automatic opening and closing cover design is adopted to avoid secondary pollution of samples and improve the compatibility and detection accuracy of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0066] Figure 1 The application provides a multi-station food grain traditional Chinese medicine moisture detection device and a detection method thereof, and belongs to the technical field of measuring instruments.

[0067] Figure 2The upper structure of the constant weight method multi-station moisture detection device is specifically shown in the figure, wherein (a) is a three-dimensional structure diagram of the upper part of the device, and (b) is a front view of the upper structure of the device;

[0068] Figure 3 The specific structure and installation position of the windproof shock isolation balance assembly, the heating and cooling drying assembly and the sample transfer mechanism of the constant weight method multi-station moisture detection device are shown in the figure, wherein (a) is an installation position diagram of the windproof shock isolation balance assembly, the heating and cooling drying assembly and the sample transfer mechanism of the device, (b) is an installation position diagram of the upper balance windproof cover and the lower balance windproof cover of the device, and (c) is an installation position diagram of the air inlet and the air outlet and the water inlet pipe and the water outlet pipe of the device;

[0069] Figure 4 The specific structure of the windproof shock isolation balance assembly of the constant weight method multi-station moisture detection device is shown in the figure;

[0070] Figure 5 The specific structure of the sample transfer mechanism of the constant weight method multi-station moisture detection device is shown in the figure, wherein (a) is a whole structure diagram of the sample transfer mechanism, and (b) is a side view of the sample transfer mechanism;

[0071] Figure 6 The specific structure of the sample transfer mechanism of the constant weight method multi-station moisture detection device is shown in the figure, wherein (a) is a specific structure and installation position diagram of the sample disc, and (b) is a whole structure and installation position diagram of the upper part of the transfer mechanism;

[0072] Figure 7 The specific structure of the sample transfer mechanism of the constant weight method multi-station moisture detection device is shown in the figure, wherein (a) is a specific structure and installation position diagram of the sample disc, and (b) is a whole structure and installation position diagram of the upper part of the transfer mechanism;

[0073] Figure 8 The specific structure of the sample disc rotating and lifting assembly of the constant weight method multi-station moisture detection device is shown in the figure, wherein (a) is an installation position diagram of the sample disc rotating and lifting assembly, and (b) is a three-dimensional structure diagram of the synchronous pulley rotating assembly;

[0074] Figure 9 The specific structure of the sample disc rotating and lifting assembly of the constant weight method multi-station moisture detection device is shown in the figure, wherein (a) is a whole structure diagram of the cam reciprocating lifting assembly, and (b) is a side view of the cam reciprocating lifting assembly;

[0075] Figure 10 The specific structure of the sample disc rotating and lifting assembly of the constant weight method multi-station moisture detection device is shown in the figure, wherein (a) is a whole structure diagram of the cam reciprocating lifting assembly, and (b) is a side view of the cam reciprocating lifting assembly;

[0076] Figure 11 Figure 2 is a schematic diagram of the specific structure of the crank pin sliding groove reciprocating lifting assembly in the constant weight method multi-station moisture detection device embodiment 2 of the present application, wherein (a) is a schematic diagram of the overall structure of the crank pin sliding groove reciprocating lifting assembly, and (b) is a schematic diagram of the installation position of the crank pin in the crank pin sliding groove reciprocating lifting assembly.

[0077] In the drawings:

[0078] 1. Support housing assembly; 10. Drying and drying chamber; 10a. Air vent; 11. Constant temperature and humidity balance chamber; 11a. Air inlet; 11b. Air outlet; 12. Middle and rear mounting chamber; 13. Heat insulation layer; 13a. Front sealing sleeve; 13b. Rear sealing sleeve; 14. Lower mounting chamber;

[0079] 2. Windproof and shock isolation balance assembly; 20. Balance module; 20a. Balance weighing rod; 20b. Sample support disc; 21. Independent balance shock isolation mounting table; 21a. Lower support; 21b. Shock absorbing pad; 21c. Upper connecting plate; 21d. Counterweight; 22. Balance windproof assembly; 22a. Upper balance windproof cover; 22b. Lower balance windproof cover;

[0080] 3. Constant temperature and humidity unit; 30. Air inlet; 31. Air outlet;

[0081] 4. Heating and cooling drying assembly; 40. Long shaft fan; 41. Heating pipe; 42. Finned tube heat exchange unit; 43. Heat exchange pipe; 43a. Water inlet pipe; 43b. Water outlet pipe; 44. Heat exchange fin; 45. Circulating cooling water system; 46. Built-in drying unit;

[0082] 5. Sample transfer mechanism; 5a. Base; 5b. Slide rail support; 5c. Slide block support;

[0083] 50. Weighing bottle body; 50a. Positioning boss; 51. Weighing bottle cap; 51a. Connecting column; 51b. Large conical surface limiting table;

[0084] 53. Sample disc; 53a. Step positioning groove; 53b. Positioning pin; 53c. Slide column; 53d. Limiting column;

[0085] 54. Bottle cap opening and closing disc; 54a. Ball sleeve; 54b. Small conical surface slot;

[0086] 55. Sample disc rotation and lifting assembly;

[0087] 56. Synchronous pulley rotating assembly; 56a. rotating motor; 56b. rotating motor mounting frame; 56c. small pulley; 56d. large pulley; 56e. synchronous belt; 56f. bearing seat; 56g. rotating hollow rod; 56h. angle sensor; 56i. tensioning screw; 56j. internally threaded support table;

[0088] 57. Cam reciprocating lifting assembly; 57a. lifting motor; 57b. eccentric cam; 57c. top block; 57d. sliding rail; 57e. sliding block; 57f. displacement sensor;

[0089] 58. Bottle cap opening and closing disc lifting assembly; 58a. electric telescopic cylinder; 58b. electric telescopic rod; 58c. ball head top sub support table; 58d. ball head top sub;

[0090] 59. Crank pin sliding groove reciprocating lifting assembly; 59a. pin crank; 59b. pin; 59c. vertical guide sleeve assembly; 59d. sliding groove;

[0091] 6. Sample adding mechanism; 60. rotary lifter; 61. sample adding elbow; 61a. hollow vertical pipe; 61b. lower inner elbow; 61c. openable and closable feeding port;

[0092] 7. Control unit. DETAILED DESCRIPTION

[0093] Example 1:

[0094] A constant weight method multi-station moisture detection device, comprising:

[0095] A support shell assembly 1, a windproof shock isolation balance assembly 2, a constant temperature and humidity unit 3, a heating and cooling drying assembly 4, a sample transfer mechanism 5, a sample adding mechanism 6, and a control unit 7;

[0096] The support shell assembly 1 comprises a drying and drying chamber 10, a constant temperature and humidity balance chamber 11, a heat insulation layer 13, a middle and rear mounting chamber 12, and a lower mounting chamber 14;

[0097] The heat insulation layer 13 is arranged between the drying and drying chamber 10 and the constant temperature and humidity balance chamber 11, the heating and cooling drying assembly 4 is arranged in the drying and drying chamber 10, the constant temperature and humidity balance chamber 11 is connected with the constant temperature and humidity unit 3, and a constant temperature and humidity environment is provided;

[0098] The windproof shock isolation balance assembly 2 comprises a balance module 20, an independent balance shock isolation mounting table 21, and a balance windproof assembly 22;

[0099] The independent balance shock isolation mounting table 21 is arranged independently of the support shell assembly 1 (without a connection relationship), is fixed to the ground in the lower mounting chamber 14, and the balance module 20 at the upper end thereof is arranged in the constant temperature and humidity balance chamber 11.

[0100] The balance module 20 includes a balance weighing rod 20a made of high borosilicate and a sample support disc 20b made of aluminum;

[0101] The balance weighing rod 20a penetrates the heat insulation layer 13 upward into the drying and drying chamber 10, and the upper end of the balance weighing rod 20a is fixedly connected with the sample support disc 20b;

[0102] The sample transfer mechanism 5 includes a weighing bottle body 50, a weighing bottle cap 51, a sample disc 53, a bottle cap opening and closing disc 54, a sample disc rotating and lifting assembly 55, and a bottle cap opening and closing disc lifting assembly 58;

[0103] The sample transfer mechanism 5 is installed in the middle and rear mounting chamber 12 through a base 5a, the base 5a is fixedly connected with a sliding rail support 5b, a vertical sliding rail 57d is arranged on the sliding rail support 5b, a sliding block 57e is slidably connected on the sliding rail 57d, and a sliding block support 5c is fixedly connected on the sliding block 57e, that is, the sliding block support 5c can slide up and down relative to the sliding rail support 5b;

[0104] Twenty stepped positioning grooves 53a are circumferentially arranged on the sample disc 53, and the stepped positioning grooves 53a are matched and positioned with positioning bosses 50a on the lower side of the weighing bottle body 50; the stepped positioning grooves 53a are further circumferentially provided with positioning pins 53b, and the stepped positioning grooves 53a and the positioning pins 53b are used for positioning and limiting the weighing bottle body 50 of different sizes;

[0105] The lower side of the bottle cap opening and closing disc 54 is fixedly connected with a ball sliding sleeve 54a, the upper side of the sample disc 53 is fixedly connected with a sliding column 53c and a limiting column 53d, the ball sliding sleeve 54a is slidably connected with the sliding column 53c, that is, the bottle cap opening and closing disc 54 can slide up and down relative to the sample disc 53, and is limited downward by the limiting column 53d;

[0106] A connecting column 51a and a large taper limiting table 51b are sequentially arranged on the upper end of the weighing bottle cap 51;

[0107] Twenty small taper slots 54b are circumferentially arranged on the bottle cap opening and closing disc 54, the connecting column 51a penetrates through the small taper slots 54b without contacting the small taper slots 54b, and the large taper limiting table 51b is larger than the small taper slots 54b;

[0108] When the bottle cap opening and closing disc 54 is connected with the limiting column 53d, the weighing bottle cap 51 is closed with the weighing bottle body 50, the large taper limiting table 51b does not contact the small taper slots 54b, when the bottle cap opening and closing disc 54 slides upward relative to the sample disc 53, the large taper limiting table 51b contacts the small taper slots 54b, the bottle cap opening and closing disc 54 drives the weighing bottle cap 51 to separate upward from the weighing bottle body 50, and at this time, a sample can be added;

[0109] The sample disc rotating and lifting assembly 55 includes a synchronous belt wheel rotating assembly 56 and a cam reciprocating lifting assembly 57.

[0110] The synchronous belt wheel rotating assembly 56 comprises a rotating motor 56a, a rotating motor mounting frame 56b, a small belt wheel 56c, a large belt wheel 56d, a synchronous belt 56e, a bearing seat 56f, a rotating hollow rod 56g, an angle sensor 56h, a tensioning screw 56i, and an internally threaded support platform 56j;

[0111] The rotating motor mounting frame 56b and the bearing seat 56f are respectively mounted on both sides of the sliding block support 5c;

[0112] The rotating hollow rod 56g is shaft-connected to the bearing seat 56f, and is provided with the angle sensor 56h at the lower end, is fixedly connected to the sample disc 53 at the upper end, and is sleeved with the large belt wheel 56d at the middle part;

[0113] The rotating motor 56a is fixed to the rotating motor mounting frame 56b, and the output shaft is fixedly connected to the small belt wheel 56c;

[0114] The small belt wheel 56c and the large belt wheel 56d are drivingly connected through the synchronous belt 56e, that is, the rotating motor 56a can drive the rotating hollow rod 56g and the sample disc 53 to rotate accurately;

[0115] The position where the rotating hollow rod 56g passes through the heat insulation layer 13 is sealingly sleeved with the rear sealing sleeve 13b;

[0116] The internally threaded support platform 56j is mounted on the sliding block support 5c, the front end of the tensioning screw 56i is shaft-connected to the rotating motor mounting frame 56b in an embedded manner (can rotate relatively but not separated), the middle part of the tensioning screw 56i is threadedly matched with the internally threaded support platform 56j, that is, rotating the tensioning screw 56i can adjust the mounting position of the rotating motor mounting frame 56b relative to the sliding block support 5c, and further adjust the tightness of the synchronous belt 56e;

[0117] The cam reciprocating lifting assembly 57 comprises a lifting motor 57a, an eccentric cam 57b, a top block 57c, and a displacement sensor 57f;

[0118] The lifting motor 57a is fixed to the sliding rail support 5b, and the output shaft is fixedly connected to the eccentric cam 57b;

[0119] The top block 57c is arranged at the lower end of the sliding block support 5c and is in contact with the eccentric cam 57b at all times under the action of gravity;

[0120] The displacement sensor 57f is arranged between the sliding rail support 5b and the sliding block support 5c, the lifting motor 57a drives the eccentric cam 57b to rotate, and further accurately controls the sliding block support 5c and the structure thereon to slide up and down relative to the sliding rail support 5b.

[0121] The bottle cap opening and closing disc lifting assembly 58 comprises an electric telescopic cylinder 58a, an electric telescopic rod 58b and a ball head support table 58c;

[0122] The electric telescopic cylinder 58a is fixed on the base 5a and can drive the electric telescopic rod 58b to move up and down.

[0123] The electric telescopic rod 58b passes through the rotating hollow rod 56g and does not contact with the rotating hollow rod 56g.

[0124] The top end of the electric telescopic rod 58b is fixed with the ball head support table 58c, which is provided with a plurality of ball heads 58d. The ball heads 58d roll on the lower end surface of the bottle cap opening and closing disc 54, that is, the electric telescopic rod 58b can move upward when the bottle cap opening and closing disc 54 rotates relative to the ball head support table 58c.

[0125] The heating and cooling drying assembly 4 comprises, from outside to inside, a long-axis fan 40, a heating pipe 41, a finned tube heat exchange unit 42 and an internal drying unit 46.

[0126] The finned tube heat exchange unit 42 comprises heat exchange pipes 43, heat exchange fins 44 and a circulating cooling water system 45. The water inlet pipe 43a and the water outlet pipe 43b of the heat exchange pipes 43 are connected with the circulating cooling water system 45.

[0127] The heat exchange fins 44 adopt high-flux radiating fins. The internal drying unit 46 adopts drying agents arranged at multiple positions in the drying and drying chamber 10.

[0128] The upper end of the drying and drying chamber 10 is provided with a ventilation valve 10a. The ventilation valve 10a is opened in the temperature rising and drying stage and is closed at the end of the temperature lowering and drying stage.

[0129] In the drying stage, the heating pipe 41 is heated, and the long-axis fan 40 blows heat into the drying and drying chamber 10, which can ensure the uniformity of temperature and prevent local temperature from being too high.

[0130] After the drying is completed, the drying stage is entered, the heating pipe 41 stops heating, the long-axis fan 40 keeps working for a period of time and then is closed. In this stage, the ventilation valve 10a is opened, the circulating cooling water system 45 starts working, the gas in the drying and drying chamber 10 diffuses upward and outward, the return air passes through the heat exchange fins 44, the drying and drying chamber 10 is rapidly cooled to the set temperature, and the ventilation valve 10a is closed. In this process, the drying agent removes the moisture in the gas to avoid the formation of condensed water.

[0131] The sample adding mechanism 6 comprises a rotary lifter 60 and a sample adding elbow 61.

[0132] The sample adding elbow 61 comprises an openable and closable feeding port 61c, a hollow vertical pipe 61a and a lower inner elbow 61b from top to bottom.

[0133] The rotating lifter 60 can drive the hollow vertical pipe 61a to rotate and move up and down, and is used for adding sample into the weighing bottle body 50;

[0134] The openable and closable feeding opening 61c can be connected with a quantitative sample adding unit to realize accurate sample adding, and the openable and closable feeding opening 61c can be closed when no sample is added.

[0135] The sample weighing support disc 20b (with a smaller diameter) can pass through the stepped positioning groove 53a, and in a non-weighing stage, the sample weighing support disc 20b is located on the lower side of the sample disc 53; in a weighing stage, the weighing bottle cover 51 is closed with the weighing bottle body 50, the sample disc rotating and lifting assembly 55 drives the sample disc 53 to rotate to the above of the sample weighing support disc 20b, the sample disc 53 is lowered, and the sample weighing support disc 20b simultaneously lifts the weighing bottle cover 51 and the weighing bottle body 50 to weigh.

[0136] The balance windproof assembly 22 includes an upper balance windproof cover 22a and a lower balance windproof cover 22b, and the balance weighing rod 20a passes through the two covers;

[0137] The upper end of the upper balance windproof cover 22a is connected with the upper wall plate of the constant temperature and humidity balance chamber 11, and the lower balance windproof cover 22b is connected with the upper end surface of the balance module 20, the two covers are mutually sleeved and sealed, and at least one of the two covers is made of flexible material, that is, the two covers are connected with flexibility, so that the heat and humidity exchange between the drying and drying chamber 10 and the constant temperature and humidity balance chamber 11 is prevented.

[0138] The position where the balance weighing rod 20a passes through the heat insulation layer 13 is sealed with a front sealing sleeve 13a.

[0139] The independent balance shock isolation mounting table 21 includes a lower support 21a, a shock absorbing pad 21b, an upper connecting plate 21c and a counterweight 21d.

[0140] The lower end of the lower support 21a is fixedly connected with the ground, and the upper end is connected with the upper connecting plate 21c through the shock absorbing pad 21b, so as to form at least three levels of shock isolation; the counterweight 21d is fixedly connected on the upper connecting plate 21c, and the upper end of the counterweight 21d is fixedly connected with the balance module 20.

[0141] The constant temperature and humidity unit 3 is located in the lower mounting chamber 14, and the air inlet 30 and the air outlet 31 are respectively connected with the air inlet 11a and the air outlet 11b in the constant temperature and humidity balance chamber 11.

[0142] Embodiment 2:

[0143] A constant weight method multi-station moisture detection device, compared with embodiment 1, only the cam reciprocating lifting assembly 57 in the sample disc rotating and lifting assembly 55 is replaced by the crank pin sliding groove reciprocating lifting assembly 59, and the rest of the structure can also be changed to achieve the above effects and functions.

[0144] The crank pin sliding groove reciprocating lifting assembly 59 comprises a lifting motor 57a, a pin crank 59a, a vertical guide sleeve assembly 59c and a displacement sensor 57f;

[0145] The lifting motor 57a and the displacement sensor 57f adopt the same arrangement as that in Embodiment 1;

[0146] The pin crank 59a is fixedly connected with the output shaft of the lifting motor 57a, and the vertical guide sleeve assembly 59c is fixedly connected with the lower end of the sliding block support 5c;

[0147] The vertical guide sleeve assembly 59c is provided with a transverse sliding groove 59d, and the pin crank 59a is provided with a pin 59b which slides in the sliding groove 59d.

[0148] The use method of the constant weight method multi-station moisture detection device is as follows:

[0149] Referring to Embodiments 1 and 2, only the structures are different, but the working principles are consistent. Taking the device structure in Embodiment 2 as an example, the specific use steps are as follows:

[0150] Step S1: turn on the equipment, and set parameters;

[0151] Step S2: sequentially place 20 empty weighing bottle bodies 50 in the stepped positioning grooves 53a of the sample disc 53, and sequentially hang 20 weighing bottle caps 51 on the small conical surface slots 54b of the bottle cap opening and closing disc 54. At this time, the weighing bottle body 50 and the weighing bottle cap 51 are in a separated state, and the positions of the weighing bottle body 50 are numbered;

[0152] Step S3: start the experiment, and the control unit 7 starts to work, the rotating motor 56a in the synchronous pulley rotating assembly 56 drives the sample disc 53 to rotate, the air valve 10a is opened, the heating pipe 41 is heated, and the long shaft fan 40 is started;

[0153] Step S4: after reaching the set time, the electric telescopic rod 58b in the bottle cap opening and closing disc lifting assembly 58 is retracted, the bottle cap opening and closing disc 54 is controlled to move downward to be in contact with the limiting column 53d, the weighing bottle cap 51 is closed with the weighing bottle body 50, at this time, the weighing bottle cap 51 is not in contact with the bottle cap opening and closing disc 54, and the heating pipe 41 stops heating (the drying stage is completed);

[0154] Step S5: start cooling, the circulating cooling water system 45 provides cold water into the finned tube heat exchange unit 42, the long shaft fan 40 keeps rotating, the drying and drying chamber 10 is rapidly cooled, and the air valve 10a is closed when the temperature is cooled to the set temperature (the drying stage is completed);

[0155] Step S6: Start weighing, the No. 1 position of the weighing bottle body 50 is positioned above the weighing support disc 20b by the synchronous belt wheel rotating assembly 56, then the sample disc 53 is lowered to the specified position by the crank pin sliding slot reciprocating lifting assembly 59, at this time the weighing support disc 20b lifts the weighing bottle body 50 and the weighing bottle cap 51, after the balance value is stable, the data is transmitted to the upper computer, the sample disc 53 is lifted by the crank pin sliding slot reciprocating lifting assembly 59, and returns to the initial position;

[0156] Step S7: Then the No. 2 position of the weighing bottle body 50 is weighed, the action of step S6 is repeated until the weighing work of the No. 20 position is completed, the electric telescopic rod 58b is extended to lift the bottle cap opening and closing disc 54 and the weighing bottle cap 51 thereon;

[0157] Step S8: The steps S3-S7 are cycled until the constant weight is obtained;

[0158] Step S9: Sample adding, the sample disc 53 is rotated by the synchronous belt wheel rotating assembly 56, and the sample adding bent pipe 61 is controlled to add samples into the No. 1-20 position of the weighing bottle body 50 in turn by the rotary lifter 60;

[0159] Step S10: The weighing bottle cap 51 is controlled to be closed with the weighing bottle body 50, and the No. 1-20 position is automatically weighed, and the balance data is automatically recorded on the upper computer;

[0160] Step S11: The steps S3-S7 are cycled until the constant weight is obtained, the data is automatically calculated and exported, and the control unit 7 closes the equipment.

[0161] In summary, the device can realize multi-station and full-process automatic constant weight method moisture detection, improve the detection efficiency and detection precision.

Claims

1. A constant weight multi-station moisture detection apparatus, comprising: Support shell assembly (1), windproof shock isolation balance assembly (2), constant temperature and humidity machine unit (3), heating and cooling drying assembly (4), sample transfer mechanism (5), sample adding mechanism (6) and control unit (7); the support shell assembly (1) comprises, from top to bottom, a drying and drying chamber (10), a heat insulation layer (13), a constant temperature and humidity balance chamber (11); the drying and drying chamber (10) is provided with a heating and cooling drying assembly (4), the constant temperature and humidity balance chamber (11) is communicated with the constant temperature and humidity machine unit (3), characterized by: The sample transfer mechanism (5) comprises a weighing bottle body (50), a weighing bottle cap (51), a sample disc (53), a bottle cap opening and closing disc (54), a sample disc rotating and lifting assembly (55) and a bottle cap opening and closing disc lifting assembly (58); The sample transfer mechanism (5) is installed in the middle of the support shell assembly (1) through a base (5a), the base (5a) is fixedly connected with a sliding rail support (5b), and the sliding rail support (5b) is slidably connected with a sliding block support (5c) upward and downward; The sample disc (53) is uniformly provided with n stepped positioning grooves (53a) on the circumference, which are matched with the positioning bosses (50a) on the lower side of the weighing bottle body (50) to position, The bottle cap opening and closing disc (54) is provided with an up-and-down sliding structure between the sample disc (53), and the bottle cap opening and closing disc (54) is limited to slide downward by the limiting column (53d) on the upper end surface of the sample disc (53).

2. The constant weight method multi-station moisture detection device according to claim 1, characterized in that: The upper end of the weighing bottle cap (51) is sequentially provided with a connecting column (51a) and a large taper limiting table (51b); The bottle cap opening and closing disc (54) is uniformly provided with n small taper slots (54b) on the circumference, the connecting column (51a) passes through the small taper slots (54b) without contacting them, and the large taper limiting table (51b) is larger than the small taper slots (54b); When the weighing bottle cap (51) is closed with the weighing bottle body (50), the large taper limiting table (51b) does not contact the small taper slots (54b), when the bottle cap opening and closing disc (54) slides upward relative to the sample disc (53), the large taper limiting table (51b) contacts the small taper slots (54b), and the bottle cap opening and closing disc (54) drives the weighing bottle cap (51) to separate upward from the weighing bottle body (50).

3. The constant weight method multi-station moisture detection device according to claim 2, characterized in that: The windproof shock isolation balance assembly (2) comprises a balance module (20), an independent balance shock isolation mounting table (21) and a balance windproof assembly (22); The balance windproof assembly (22) comprises an upper balance windproof cover (22a) and a lower balance windproof cover (22b) which are sleeved outside the balance weighing rod (20a); The upper end of the upper balance windproof cover (22a) is connected with the upper wall plate of the constant temperature and humidity balance chamber (11), and the lower end of the lower balance windproof cover (22b) is connected with the upper end surface of the balance module (20), the two are sleeved and sealed, and at least one is made of flexible material; The independent balance shock isolation mounting table (21) does not contact the support shell assembly (1), the lower end thereof is fixedly connected with the ground, and the balance module (20) on the upper end thereof is located in the constant temperature and humidity balance chamber (11). The balance module (20) comprises a balance weighing rod (20a) and a sample support disc (20b) at the upper end of the balance weighing rod (20a), the balance weighing rod (20a) passes through the heat insulation layer (13) into the drying and drying chamber (10) upward.

4. The constant weight method multi-station moisture detection device according to claim 3, characterized in that: The sample disc rotating and lifting assembly (55) comprises a synchronous belt wheel rotating assembly (56) and a reciprocating lifting assembly; The synchronous belt wheel rotating assembly (56) comprises a rotating motor (56a), a small belt wheel (56c), a large belt wheel (56d), a synchronous belt (56e), a bearing seat (56f), a rotating hollow rod (56g), and an angle sensor (56h); The bearing seat (56f) is installed on one side of the sliding block support (5c), and the rotating hollow rod (56g) is connected to the bearing seat (56f) in a rotating manner; The rotating hollow rod (56g) is provided with the angle sensor (56h) at the lower end, is fixedly connected to the sample disc (53) at the upper end, and is sleeved with the large belt wheel (56d) at the middle part; The rotating motor (56a) is fixed on the other side of the sliding block support (5c), and the output shaft is fixedly connected to the small belt wheel (56c); The small belt wheel (56c) and the large belt wheel (56d) are drivingly connected through the synchronous belt (56e); The rotating hollow rod (56g) passes through the position of the rear sealing sleeve (13b) of the heat insulation layer (13) in a sealing manner.

5. The constant weight method multi-station moisture detection device according to claim 4, characterized in that: The reciprocating lifting assembly is a cam reciprocating lifting assembly (57), which comprises a lifting motor (57a), an eccentric cam (57b), a top block (57c), and a displacement sensor (57f); The lifting motor (57a) is fixed on the sliding rail support (5b), and the output shaft is fixedly connected to the eccentric cam (57b); the top block (57c) is arranged at the lower end of the sliding block support (5c) and is subjected to gravity; the top block (57c) is in contact with the eccentric cam (57b) at all times; The displacement sensor (57f) is arranged between the sliding rail support (5b) and the sliding block support (5c), and the eccentric cam (57b) drives the sliding block support (5c) to slide up and down.

6. The constant weight method multi-station moisture detection device according to claim 4, characterized in that: The reciprocating lifting assembly is a crank pin sliding groove reciprocating lifting assembly (59), which comprises a lifting motor (57a), a pin crank (59a), a vertical guide sleeve assembly (59c), and a displacement sensor (57f); The pin crank (59a) is fixedly connected to the output shaft of the lifting motor (57a), and the vertical guide sleeve assembly (59c) is fixedly connected to the lower end of the sliding block support (5c); the vertical guide sleeve assembly (59c) is provided with a horizontal sliding groove (59d) on the upper end, the pin crank (59a) is provided with a pin (59b), and the pin (59b) slides in the sliding groove (59d) to drive the sliding block support (5c) to move up and down.

7. The constant weight method multi-station moisture detection device according to claim 5 or 6, characterized in that: The bottle cap opening and closing disc lifting assembly (58) comprises an electric telescopic cylinder (58a), an electric telescopic rod (58b), and a ball head top support table (58c). The electric telescopic cylinder (58a) is fixed to the base (5a), and drives the electric telescopic rod (58b) to move up and down; The electric telescopic rod (58b) passes through the rotating hollow rod (56g) and is not in contact with the rotating hollow rod (56g); The top end of the electric telescopic rod (58b) is fixed to the ball head top support table (58c), and a plurality of ball head tops (58d) are arranged on the ball head top support table (58c); The ball head top (58d) is in rolling connection with the lower end surface of the bottle cap opening and closing disc (54).

8. The constant weight method multi-station moisture detection device according to claim 7, wherein: The heating and cooling drying assembly (4) comprises, from outside to inside, a long-axis fan (40), a heating pipe (41), a finned tube heat exchange unit (42), and an internal drying unit (46); The finned tube heat exchange unit (42) comprises a heat exchange pipe (43), heat exchange fins (44), and a circulating cooling water system (45); The upper end of the drying chamber (10) is provided with a ventilation valve (10a), the ventilation valve (10a) is opened in the temperature rising drying stage, and the ventilation valve (10a) is closed at the end of the temperature decreasing drying stage.

9. The constant weight method multi-station moisture detection device according to claim 8, wherein: The sample adding mechanism (6) comprises a rotary lifter (60) and a sample adding elbow piece (61); The sample adding elbow piece (61) comprises an openable and closable feeding opening (61c), a hollow vertical pipe (61a), and a lower inner elbow pipe (61b) from top to bottom; The rotary lifter (60) drives the hollow vertical pipe (61a) to rotate and move up and down, and is used for adding samples into the weighing bottle body (50); The sample weighing support disc (20b) is located on the lower side of the sample disc (53), and when weighing, it passes through the stepped positioning groove (53a) to simultaneously lift the weighing bottle cap (51) and the weighing bottle body (50) to weigh.

10. A constant weight multi-station moisture detection method, characterized by: The constant weight method multi-station moisture detection device of claim 9 comprises: S1. Turn on the equipment and set the parameters; S2. Put n empty weighing bottle bodies (50) into the stepped positioning groove (53a) of the sample disc (53) in turn, and hang n weighing bottle caps (51) on the small conical surface slot (54b) of the bottle cap opening and closing disc (54) in turn, at this time, the weighing bottle body (50) and the weighing bottle cap (51) are in a separated state, and the positions of the weighing bottle bodies (50) are numbered; S3. Start the experiment, the control unit (7) starts to work, the rotating motor (56a) in the synchronous belt pulley rotating assembly (56) drives the sample disc (53) to rotate, the ventilation valve (10a) is opened, the heating pipe (41) is heated, and the long-axis fan (40) is started; S4. After reaching the set time, the electric telescopic rod (58b) in the bottle cap opening and closing disc lifting assembly (58) is retracted, the bottle cap opening and closing disc (54) is lowered to be in contact with the limiting column (53d), the weighing bottle cap (51) is closed with the weighing bottle body (50), at this time, the weighing bottle cap (51) is not in contact with the bottle cap opening and closing disc (54), the heating pipe (41) stops heating, and the drying is completed. S5. Start cooling, cold water is provided into the finned tube heat exchange unit (42) by the circulating cooling water system (45), the long axis fan (40) keeps rotating, the drying and drying chamber (10) is rapidly cooled, until the cooling temperature is set, the ventilation valve (10a) is closed, and the drying is completed; S6. Start weighing, the weighing bottle body (50) of No. 1 position is positioned above the weighing support disc (20b) by the synchronous pulley rotating assembly (56), then the sample disc (53) is lowered to the specified position by the cam reciprocating lifting assembly (57) or the crank pin sliding groove reciprocating lifting assembly (59), at this time, the weighing support disc (20b) lifts the weighing bottle body (50) and the weighing bottle cap (51), after the balance value is stable, the data is transmitted to the upper computer, the sample disc (53) is lifted by the crank pin sliding groove reciprocating lifting assembly (59), and returns to the initial position; S7. Then, the weighing bottle body (50) of No. 2 position is weighed, the action of S6 is repeated, until the weighing work of No. 20 position is completed, the electric telescopic rod (58b) is extended, and the bottle cap opening and closing disc (54) and the weighing bottle cap (51) thereon are lifted; S8. Circulate the processes of S3-S7 until the constant weight; S9. Add sample, the sample disc (53) is rotated by the synchronous pulley rotating assembly (56), and the sample adding elbow pipe (61) is sequentially added into the weighing bottle body (50) of No. 1-20 position by the rotary lifter (60); S10. The weighing bottle cap (51) and the weighing bottle body (50) are closed, 1-20 positions are automatically weighed, and the balance data is automatically recorded on the upper computer; S11. Circulate the processes of S3-S7 until the constant weight, automatically calculate the data and export, and the control unit (7) closes the equipment.

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