Tablet hardness tester with protective structure

Abstract

The invention relates to the technical field of tablet hardness testers, in particular to a tablet hardness tester with a protection structure. Comprising a machine frame, a testing frame, a microcontroller, a rotating frame and a driving gear ring, the rotating frame and the driving gear ring can independently rotate, a feeding and discharging station, a detecting station, a cleaning station and an overturning station are sequentially arranged on the machine frame in the clockwise direction, four testing systems are installed on the rotating frame, and an overturning gear ring and a reset gear ring are installed on the machine frame. A first visual probe, a capacitive humidity sensor, a glass cover and a negative pressure rotating cylinder are installed on the testing frame, a second visual probe is arranged at the axis position of the glass cover, the data ends of the first visual probe, the capacitive humidity sensor and the second visual probe are all in data connection with the microcontroller, and a negative pressure cleaning assembly is arranged in the negative pressure rotating cylinder. According to the invention, through the collaborative design of independent driving of the double servo motors and circulating stations of the four test systems, an efficient and continuous detection process is constructed.

Description

TECHNICAL FIELD

[0001] The present application relates to tablet hardness tester technical field, specifically to a tablet hardness tester with protection structure. BACKGROUND

[0002] As one of the most widely used dosage forms in the pharmaceutical industry, the hardness of tablets is directly related to the stability, disintegration and safety of the drug, and is one of the core quality control indicators in the production process of the drug. As a key equipment for detecting this indicator, tablet hardness tester is widely used in the production and quality inspection links of pharmaceutical enterprises and the sampling inspection work of drug regulatory agencies. Its testing efficiency, data accuracy and operation safety have important influence on the quality control of the drug.

[0003] The prior art has the following disadvantages: 1. Low work efficiency and easy interference of driving, difficult to adapt to batch detection; 2. Lack of pretreatment detection mechanism, the accuracy of detection data is affected by the appearance integrity and humidity state of the tablet; 3. No effective protection and process monitoring, with safety hazards and poor test traceability; 4. The cleaning method is backward, and residual drug powder is easy to cause cross contamination. After the tablet is tested, the surface of the contact parts such as the clamp and the bearing table is easy to leave residual drug powder. If not cleaned in time, the residual drug powder will cause cross contamination when testing different batches or different types of tablets subsequently, resulting in distorted test data, and even affecting the quality of the drug. The current mainstream cleaning method is manual cleaning, which needs to be suspended; Therefore, the present application provides a tablet hardness tester with protection structure to solve the problems in the background art. SUMMARY

[0004] The present application provides a tablet hardness tester with protection structure to solve the problems in the background art.

[0005] To achieve the above purpose, the technical scheme adopted by the present application is as follows: a tablet hardness tester with protection structure, comprising a rack, a test frame, a microcontroller, and an independently rotatable rotary frame and a driving gear ring, the rack is provided with an upper and lower material loading and unloading station, a detection station, a cleaning station and a turnover station in sequence in clockwise direction, the rotary frame is provided with four test systems, and the rack is provided with a turnover gear ring and a reset gear ring; The test frame is provided with a first visual probe, a capacitive humidity sensor, a glass cover and a negative pressure rotating cylinder, the axis of the glass cover is provided with a second visual probe, the data terminals of the first visual probe, the capacitive humidity sensor and the second visual probe are connected with the microcontroller, and the negative pressure rotating cylinder is provided with a negative pressure cleaning assembly; The test system comprises a turnover frame rotatably connected to a rotating frame, the turnover frame is driven to turn over 180 degrees through a turnover gear ring and is driven to reset through a reset gear ring, a vibration generating assembly is installed on the turnover frame, a vibration frame is arranged on the vibration generating assembly, the vibration generating assembly is meshed with a driving gear ring at a detection station and a turnover station, when the driving gear ring rotates, the vibration frequency and stroke of the vibration frame change cyclically, two spacing-adjustable clamps are arranged on the vibration frame, the two clamps are connected with pressure conducting blocks through pressure sensors, the data end of the pressure sensor is connected with a microcontroller, and two test clamping holes symmetrical and matched with the pressure conducting blocks are arranged on the glass cover.

[0006] As a preferred technical scheme of the present application, the microcontroller is fixedly installed on the rack, two servo motors are installed on the lower part of the rack, the output shaft end of one servo motor is fixedly installed with a rotating shaft, the end of the rotating shaft is fixedly connected with the rotating frame, a shaft sleeve is rotatably arranged on the rotating shaft, the output shaft end of the other servo motor is drivingly connected with the shaft sleeve through a first toothed belt, the driving gear ring is fixedly installed on the shaft sleeve, the test frame is slidingly connected with the rack, and a vertically arranged lifting push rod is installed between the test frame and the rack.

[0007] As a preferred technical scheme of the present application, the first visual probe and the capacitive humidity sensor are arranged on the feeding and discharging stations, the axis of the first visual probe is perpendicular to the horizontal plane, the axis of the capacitive humidity sensor is parallel to the horizontal plane, the glass cover is arranged directly above the detection station, the negative pressure rotating cylinder is arranged directly above the cleaning station, and a waste collecting box with an open top end is installed on the rack and corresponds to the turnover station.

[0008] As a preferred technical scheme of the present application, the negative pressure cleaning assembly comprises a rotating motor installed on the test frame, the negative pressure rotating cylinder is rotatably connected with the test frame, the output shaft end of the rotating motor is drivingly connected with the negative pressure rotating cylinder through a second toothed belt, the outer wall of the negative pressure rotating cylinder is uniformly provided with bristles for cleaning the pressure conducting blocks, the inner bottom surface of the negative pressure rotating cylinder is installed with a brush net, the test frame is installed with a negative pressure cleaner, and the negative pressure end of the negative pressure cleaner is rotatably communicated with the inner cavity of the negative pressure rotating cylinder through a rotary joint.

[0009] As a preferred technical scheme of the present application, a bidirectional screw rod is rotatably installed on the vibration frame, a driving motor is installed on the bottom surface of the vibration frame, a first bevel gear is installed on the output shaft end of the driving motor and the bidirectional screw rod, the two first bevel gears are orthogonally meshed, a forward threaded section and a reverse threaded section are symmetrically arranged on the bidirectional screw rod, the forward threaded section and the reverse threaded section are respectively drivingly connected with the two clamps, and the two clamps are slidingly connected with the vibration frame.

[0010] As the preferred technical scheme of the present application, the vibration generating assembly comprises a rotating shaft mounted on the turnover frame, the rotating shaft is rotationally connected with the rotating frame, the inner wall of the rotating shaft is rotationally mounted with a first pinion shaft through a bearing, the tail end of the first pinion shaft is mounted with a driven bevel gear, the rotating frame is rotationally mounted with a second pinion shaft, the first pinion shaft and the second pinion shaft are both mounted with a second bevel gear, the two second bevel gears are orthogonal and meshed, the second pinion shaft is mounted with a turnover gear which is adapted to mesh with a turnover gear ring and a reset gear ring, the vibration frame is slidingly connected with the turnover frame, the bottom surface of the vibration frame is mounted with a reset spring, the other end of the reset spring is fixedly connected with the turnover frame, the turnover frame is rotationally mounted with a third pinion shaft, the third pinion shaft and the first pinion shaft are both mounted with a third bevel gear, the two third bevel gears are orthogonal and meshed, the third pinion shaft is mounted with a driving wheel, the driving wheel is alternately provided with two convex tooth segments and two empty tooth reset segments, the vibration frame is mounted with a toothed plate, and the two convex tooth segments are alternately meshed with the toothed plate.

[0011] As the preferred technical scheme of the present application, the turnover gear ring is arranged between the cleaning station and the turnover station, the reset gear ring is arranged between the turnover station and the feeding and discharging station, the central angles of the turnover gear ring and the reset gear ring are both 45°, the turnover gear ring is arranged on the inner side of the turnover gear, and the reset gear ring is arranged on the outer side of the turnover gear.

[0012] As the preferred technical scheme of the present application, the two convex tooth segments are both provided with teeth which are meshed with the toothed plate, the central angle of one convex tooth segment is 30°, the central angle of the other convex tooth segment is 60°, and the central angles of the two empty tooth reset segments are both 135°.

[0013] As the preferred technical scheme of the present application, the convex tooth segments and the toothed plate are both provided with rubber coating layers, and the rotating connection part of the rotating shaft and the rotating frame is fixedly provided with a damping ring.

[0014] As the preferred technical scheme of the present application, the positions of the machine frame corresponding to the detection station and the turnover station are both rotationally mounted with a transmission shaft, the two transmission shafts are both mounted with a driving bevel gear which is adapted to mesh with a driven bevel gear, and the transmission shaft is mounted with a driven gear which is meshed with a driving gear ring.

[0015] Compared with the prior art, the present application has the beneficial effects that: 1.The application constructs an efficient continuous detection process through the cooperative design of double servo motors independently driving four test system circulating stations. One servo motor directly drives the rotation of the rotating frame through the rotating shaft, which makes the four test systems on the rotating frame switch clockwise along the feeding, detection, cleaning, and overturning stations, realizing the parallel processing of multiple tablets. The other servo motor independently rotates through the first toothed belt drive shaft sleeve, which in turn drives the rotation of the driving gear ring. The rotating shaft and the shaft sleeve are in a rotating sleeve structure, ensuring that the rotating frame station switching and the driving gear ring power output are completely independent of each other. At the same time, the lifting push rod can drive the test frame to slide vertically, flexibly adapting to the test height requirements of tablets of different specifications. This design is significantly different from the existing fixed structure and shared power source design. It decouples the station switching and function driving, and through the linkage of multiple test systems and independent driving, it improves the efficiency of batch tablet detection.

[0016] 2.The application constructs a cooperative preprocessing system of visual recognition and non-contact humidity detection at the feeding and discharging stations. The first visual probe shoots the tablets to be tested along the vertical direction, accurately identifying appearance defects such as cracks, missing corners, and deformation. The capacitive humidity sensor collects humidity data of the tablets in a non-contact manner along the horizontal direction. The data is transmitted in real time to the microcontroller, which automatically selects the tablets with qualified appearance and humidity to enter the subsequent detection link, and directly rejects unqualified samples. This design breaks through the technical limitations of existing direct testing without screening. The innovation lies in the linkage of vertical visual appearance detection and horizontal non-contact humidity detection, forming a double check before tablet testing, which not only avoids the low hardness value of appearance damaged tablets due to structural damage, but also prevents data distortion of humidity exceeding tablets due to moisture absorption softening, improving the effective detection rate and ensuring the authenticity and reliability of hardness detection data from the source.

[0017] 3.The application forms a double protection through the cooperative design of the glass cover closed structure and the second visual probe. At the detection station, the glass cover covers the test area to form a completely enclosed space, which can effectively block the flying of drug powder when the tablets are crushed, avoid injury to the eyes and respiratory tract of the operator, and isolate the external airflow from interfering with the test. The second visual probe set at the axis position of the glass cover can shoot the whole process of tablet deformation and crushing in real time and transmit the image data to the microcontroller for storage. This design is significantly different from the existing open test bench mode. The innovation lies in the deep linkage of physical protection and process recording, which not only eliminates safety hazards through closed structure, but also realizes the whole process tracing of the test process through visual monitoring. When there is data anomaly, it can be quickly judged whether it is a tablet defect or a device test error through the playback image, greatly improving the quality problem troubleshooting efficiency.

[0018] 4. The application designs a linkage cleaning assembly of negative pressure rotary cylinder and brush net, negative pressure dust collector in the cleaning station, the rotary motor drives the negative pressure rotary cylinder to rotate through the second gear belt, the uniformly distributed bristles on the outer wall can mechanically clean the surface of the clamp and pressure transmission block, the negative pressure dust collector generates continuous negative pressure through the inner cavity of the negative pressure rotary cylinder, the drug powder generated during cleaning is filtered by the brush net on the inner bottom surface of the negative pressure rotary cylinder and is directly sucked into the dust collector for collection, the brush net can also perform secondary cleaning on the surface of the vibration frame, so as to avoid the residue of fine drug powder, the design breaks through the technical limitations of manual wiping or single brush cleaning, and mechanically cleaning, negative pressure dust collection and brush net are integrated, the mechanical cleaning is responsible for peeling off the attached drug powder, the negative pressure dust collection is responsible for immediate collection, the brush net is responsible for filtering and secondary cleaning, and the three form a closed loop cleaning process, so that the cleaning has no dead angle and no drug powder residue, the cleaning efficiency is improved, the cross contamination during the test of different batches and different types of tablets is avoided, manual intervention is not required, and the maintenance cost is reduced.

[0019] 5. The application realizes automatic turning and resetting of the test system by moving the work station through the meshing design of the turning gear ring, the resetting gear ring and the turning gear, the turning gear ring is arranged between the cleaning station and the turning station and is located on the inner side of the turning gear, the resetting gear ring is arranged between the turning station and the feeding and discharging stations and is located on the outer side of the turning gear, when the rotating frame drives the test system to rotate, the turning gear first meshes with the inner turning gear ring to drive the turning frame to accurately turn 180°, and the residual tablets fall into the waste collection box below, then the turning gear meshes with the outer resetting gear ring to drive the turning frame to reversely reset to the initial state, the design realizes turning and resetting by using the power of the rotating frame work station movement, without an additional driving motor, so that the structure is simplified, the energy consumption is reduced, the risk of motion interference is avoided, the gear ring with a 45° central angle ensures that the turning angle is accurately 180°, and the vibration of the detection vibration frame is auxiliary, so that the residual rate of tablets is reduced and the discharging is complete. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a whole structure schematic view of a tablet hardness tester with a protection structure; Figure 2 It is a structure schematic view of a waste collection box and a test frame; Figure 3 It is a structure schematic view of a test frame and a first visual probe; Figure 2 It is a local enlarged structure schematic view of position A in the middle; Figure 4 It is a structure schematic view of a transmission shaft and a follow-up gear; Figure 5 It is a structure schematic view of a test frame and a first visual probe; Figure 6 It is a sectional structure schematic view of a rotating shaft and a shaft sleeve; Figure 7 It is a structure schematic view of a test frame and a first visual probe; Figure 6 It is a local enlarged structure schematic view of position B. Figure 8 Structure diagram of the vibration frame and the clamp; Figure 9 Structure diagram of the vibration frame and the clamp; Figure 8 Structure diagram of the vibration frame and the clamp.

[0021] In the drawings, the components represented by the respective reference numbers are listed as follows: 1, frame; 2, test frame; 3, microcontroller; 4, rotating frame; 5, driving gear ring; 6, overturning gear ring; 7, reset gear ring; 8, first visual probe; 9, capacitive humidity sensor; 10, glass cover; 11, negative pressure rotating cylinder; 12, second visual probe; 13, overturning frame; 14, vibration frame; 15, clamp; 16, pressure transmission block; 17, servo motor; 18, rotating shaft; 19, shaft sleeve; 20, lifting push rod; 21, waste collection box; 22, rotating motor; 23, brush hair; 24, brush net; 25, negative pressure dust collector; 26, bidirectional screw rod; 27, overturning shaft; 28, first gear shaft; 29, second gear shaft; 30, overturning gear; 31, reset spring; 32, third gear shaft; 33, driving wheel; 34, convex tooth section; 35, empty tooth reset section; 36, toothed plate; 37, transmission shaft; 38, follow-up gear; 39, test clamping hole. DETAILED DESCRIPTION

[0022] The principles and features of the present application are described below in conjunction with the drawings, and the examples are only used to explain the present application and are not used to limit the scope of the present application.

[0023] The present application provides the following preferred embodiments As Figures 1-9 shown, a tablet hardness tester with a protection structure comprises a frame 1, a test frame 2, a microcontroller 3, and a rotating frame 4 and a driving gear ring 5 that can rotate independently, the frame 1 is sequentially provided with a feeding and discharging station, a detection station, a cleaning station, and an overturning station in a clockwise direction, and four test systems are installed on the rotating frame 4; The four test systems are distributed at equal intervals of 90° to form a circulating detection; The model of the microcontroller 3 is STM32F407; The device is mainly suitable for continuous hardness detection of batches of tablets; A six-degree-of-freedom manipulator is arranged at the feeding and discharging station, and the six-degree-of-freedom manipulator is used for automatic feeding and discharging of the tablets to be tested; The microcontroller 3 is fixedly installed on the rack 1, two servo motors 17 are installed on the lower part of the rack 1, the output shaft end of one servo motor 17 is fixedly installed with a rotating shaft 18, the end of the rotating shaft 18 is fixedly connected with the rotating frame 4, the rotating shaft 18 is rotatably sleeved with a shaft sleeve 19, the output shaft end of the other servo motor 17 is drivingly connected with the shaft sleeve 19 through a first toothed belt, the driving ring 5 is fixedly installed on the shaft sleeve 19, the test frame 2 is slidingly connected with the rack 1, and a vertically arranged lifting push rod 20 is installed between the test frame 2 and the rack 1; The microcontroller 3 is fixedly installed on the rack 1, two servo motors 17 are installed on the lower part of the rack 1, the output shaft end of one servo motor 17 is fixedly installed with a rotating shaft 18, the end of the rotating shaft 18 is fixedly connected with the rotating frame 4, the rotating shaft 18 is rotatably sleeved with a shaft sleeve 19, the output shaft end of the other servo motor 17 is drivingly connected with the shaft sleeve 19 through a first toothed belt, the driving ring 5 is fixedly installed on the shaft sleeve 19, the test frame 2 is slidingly connected with the rack 1, and a vertically arranged lifting push rod 20 is installed between the test frame 2 and the rack 1; The scheme solves the technical problems that the traditional tablet hardness tester is mostly single-station operation, the test efficiency is low, and the motion interference is prone to occur between the station driving and the ring driving, and the height of the test component is fixed and difficult to adapt to different specifications of tablets; The above structure realizes independent driving of the rotating frame 4 and the driving ring 5, avoids the risk of motion interference, and greatly improves the continuous detection efficiency of batch tablets, thereby providing a basic guarantee for the operation of the automatic production line; The rack 1 is provided with a turnover ring 6 and a reset ring 7; The test frame 2 is provided with a first visual probe 8, a capacitive humidity sensor 9, a glass cover 10 and a negative pressure rotary cylinder 11, the axis of the glass cover 10 is provided with a second visual probe 12, the data ends of the first visual probe 8, the capacitive humidity sensor 9 and the second visual probe 12 are connected with the microcontroller 3, and the negative pressure rotary cylinder 11 is provided with a negative pressure cleaning assembly; The first visual probe 8 and the capacitive humidity sensor 9 are arranged on the feeding and discharging station, the axis of the first visual probe 8 is perpendicular to the horizontal plane, the axis of the capacitive humidity sensor 9 is parallel to the horizontal plane, the glass cover 10 is arranged directly above the detection station, the negative pressure rotary cylinder 11 is arranged directly above the cleaning station, and a waste collecting box 21 with an open top is installed on the rack 1 and corresponds to the turnover station; The capacitive humidity sensor 9 collects the humidity value of the tablets placed on the test frame 14 in a non-contact manner; In the feeding and discharging station, the first visual probe 8 shoots the tablets to be tested along the vertical direction, quickly identifies whether the tablets have appearance defects such as breakage and deformation, and the capacitive humidity sensor 9 collects the tablet humidity data in a non-contact manner along the horizontal direction, and the data of the two is transmitted to the microcontroller 3 in real time for pretreatment screening, and in the detection station, the glass cover 10 covers the test area to form a closed space; The closed space can avoid the tablets from splashing due to extrusion during testing, thereby protecting the operator; The second visual probe 12 shoots the hardness test process in real time from the axis position of the glass cover 10, the negative pressure rotary cylinder 11 cleans the pressure conduction block 16 of the clamp 15 in the cleaning station, and the turnover frame 13 turns over the residual tablets to directly fall into the waste collection box 21 for collection in the turnover station. The scheme solves the technical problems that the traditional tester lacks pretreatment detection of tablet appearance and humidity, leading to tablets with appearance damage or abnormal humidity entering the test link, affecting the accuracy of detection data, and the collected tablets after testing are inconvenient, and the test area is easily disturbed by the outside world; By screening unqualified tablets in advance, invalid testing is avoided, and the accuracy of detection data is ensured, the closed structure of the glass cover 10 reduces the interference of the external environment on the test, and the second visual probe 12 realizes traceability of the test process; The first visual probe 8, the capacitive humidity sensor 9, the second visual probe 12 and the microcontroller 3 can be customized or selected according to actual needs; The negative pressure cleaning assembly includes a rotary motor 22 mounted on the test frame 2, the negative pressure rotary cylinder 11 is rotationally connected with the test frame 2, the output shaft end of the rotary motor 22 is drivingly connected with the negative pressure rotary cylinder 11 through a second toothed belt, the outer wall of the negative pressure rotary cylinder 11 is uniformly provided with brushes 23 for cleaning the pressure conduction block 16, and the inner bottom surface of the negative pressure rotary cylinder 11 is provided with a brush net 24; The mesh aperture of the brush net 24 is smaller than the particle size of the tablets to be tested; A negative pressure dust collector 25 is mounted on the test frame 2, and the negative pressure end of the negative pressure dust collector 25 is rotationally communicated with the inner cavity of the negative pressure rotary cylinder 11 through a rotary joint.

[0024] During the cleaning station operation, the rotary motor 22 drives the negative pressure rotary cylinder 11 to rotate through the second toothed belt, the brushes 23 on the outer wall of the negative pressure rotary cylinder 11 mechanically clean the pressure conduction block 16 on the clamp 15, and at the same time, the negative pressure dust collector 25 is started, a negative pressure is generated in the inner cavity of the negative pressure rotary cylinder 11, and the generated drug powder is filtered by the brush net 24 and then sucked into the negative pressure dust collector 25; The scheme solves the technical problems that the pressure conduction block 16 is easy to leave residual drug powder after tablet testing, manual wiping has low cleaning efficiency and is easy to damage parts, and residual drug powder pollutes subsequent test tablets and affects detection accuracy; The mechanical cleaning is combined with the negative pressure cleaning, no drug powder is left, the subsequent test tablets are not polluted, the brush net 24 effectively cleans the surface of the vibration frame 14, ensures that the cleaning process is stable and continuous, no manual intervention is needed, the automatic level of the equipment is improved, and the manual maintenance cost is reduced, the brush net 24 is fixed to the bottom surface of the negative pressure rotary cylinder 11 in a bonding mode, and the brush net 24 should be periodically replaced during use; The test system comprises a turnover frame 13 rotationally connected to the rotating frame 4, the turnover frame 13 is driven to turn over 180° through the turnover gear ring 6 and is driven to reset through the reset gear ring 7; The vibration generating assembly is installed on the turnover frame 13, the vibration generating assembly is provided with the vibration frame 14, the vibration generating assembly is meshed with the driving gear ring 5 at the detection station and the turnover station, the vibration frequency and stroke cycle of the vibration frame 14 at the detection station and the turnover station change cyclically when the driving gear ring 5 rotates, the vibration frame 14 is provided with two spacing-adjustable clamps 15, the two clamps 15 are both connected with the pressure conduction block 16 through the pressure sensor, the data end of the pressure sensor is in data connection with the microcontroller 3, and the glass cover 10 is provided with two symmetrical test clamping holes 39 which are adapted to the pressure conduction block 16.

[0025] When the test system enters the detection station, the spacing-adjustable clamp 15 on the vibration frame 14 clamps the tablet to be tested, the clamp 15 passes through the test clamping hole 39 on the glass cover 10 through the pressure conduction block 16 connected with the pressure sensor, and the pressure sensor collects the pressure data of the tablet in real time and transmits the pressure data to the microcontroller 3; The vibration frame 14 is rotationally provided with a bidirectional screw rod 26, the bottom surface of the vibration frame 14 is provided with a driving motor, the output shaft end of the driving motor and the bidirectional screw rod 26 are both provided with first bevel gears, the two first bevel gears are orthogonally meshed, the bidirectional screw rod 26 is symmetrically provided with a forward threaded section and a reverse threaded section, the forward threaded section and the reverse threaded section are respectively in transmission connection with the two clamps 15, and the two clamps 15 are both in sliding connection with the vibration frame 14.

[0026] When the spacing of the clamp 15 is adjusted, the driving motor is started, the bidirectional screw rod 26 is driven to rotate through the two orthogonally meshed first bevel gears, the forward threaded section and the reverse threaded section of the bidirectional screw rod 26 respectively drive the two clamps 15 to synchronously slide along the vibration frame 14, the spacing of the clamp 15 is increased or decreased, and the spacing adjustment data is accurately controlled by the microcontroller 3; The vibration generating assembly comprises a turnover shaft 27 installed on the turnover frame 13, and the turnover shaft 27 is rotationally connected with the rotating frame 4; A first gear shaft 28 is rotationally installed on the inner wall of the turnover shaft 27, a driven bevel gear is installed at the tail end of the first gear shaft 28, a second gear shaft 29 is rotationally installed on the rotating frame 4, second bevel gears are installed on the first gear shaft 28 and the second gear shaft 29, the two second bevel gears are orthogonally meshed, and a turnover gear 30 adapted to mesh with the turnover gear ring 6 and the reset gear ring 7 is installed on the second gear shaft 29. The turnover gear ring 6 is arranged between the cleaning station and the turnover station, and the reset gear ring 7 is arranged between the turnover station and the feeding and discharging station. The central angles of the turnover gear ring 6 and the reset gear ring 7 are both 45°. The turnover gear ring 6 is arranged on the inner side of the turnover gear 30, and the reset gear ring 7 is arranged on the outer side of the turnover gear 30. When the test system rotates to the position between the cleaning station and the turnover station, the turnover gear 30 meshes with the inner turnover gear ring 6, the second tooth shaft 29 rotates, the first tooth shaft 28 rotates through the second bevel gear, and the turnover frame 13 is driven to turn over. When the test system rotates to the position between the turnover station and the feeding and discharging station, the turnover gear 30 meshes with the outer reset gear ring 7, and the turnover frame 13 is reversely driven to reset. The 45° central angles of the turnover gear ring 6 and the reset gear ring 7 ensure that the turnover angle is accurate to 180°. The scheme solves the technical problems of the traditional turnover mechanism, such as the need for a separate driving motor, the interference with the rotation of the frame 4, the difficulty in accurately controlling the turnover angle, the poor reset reliability, and the influence on the continuous operation of the equipment. The fixed layout of the turnover gear ring 6 and the reset gear ring 7 is used to realize turnover and reset through the alternate meshing of the turnover gear 30, without the need for an additional driving motor. The structure is simplified, the energy consumption is reduced, the 45° central angle design ensures the accuracy of the turnover and reset stroke, avoids the poor unloading and structural damage caused by insufficient or excessive turnover, and the layout of the inner side of the turnover gear ring 6 and the outer side of the reset gear ring 7 avoids the motion interference during meshing, ensures stable transmission, and provides support for the cyclic operation of the test system.

[0027] The transmission shaft 37 is rotatably installed on the rack 1 at positions corresponding to the detection station and the turnover station. The transmission shaft 37 is provided with a driving bevel gear that meshes with a driven bevel gear. The transmission shaft 37 is provided with a follow-up gear 38 that meshes with the driving gear ring 5. When the driving gear ring 5 rotates, the follow-up gear 38 on the transmission shaft 37 rotates, the transmission shaft 37 synchronously drives the driving bevel gear to rotate, the driving bevel gear meshes with the driven bevel gear at the tail end of the first tooth shaft 28, and the power of the driving gear ring 5 is stably transmitted to the first tooth shaft 28 to provide power input for the vibration generating assembly.

[0028] When the tablets are tested for hardness at the detection station, the driving gear ring 5 stops working, and when the two clamps 15 reset, the driving gear ring 5 rotates again. After the detection is completed, the vibration frame 14 vibrates at the detection station, thereby effectively reducing the adhesion rate of broken tablets on the vibration frame 14 and the pressure conducting block 16, and facilitating subsequent cleaning and reducing the residual rate of tablets on the vibration frame 14 and the pressure conducting block 16. The middle part of the vibration frame 14 is provided with a flat plate for placing the tablets to be tested. The vibration frame 14 is slidably connected with the turnover frame 13, the bottom surface of the vibration frame 14 is provided with a reset spring 31, the other end of the reset spring 31 is fixedly connected with the turnover frame 13, the turnover frame 13 is rotatably provided with a third gear shaft 32, the third gear shaft 32 and the first gear shaft 28 are both provided with a third bevel gear, the two third bevel gears are orthogonally engaged, the third gear shaft 32 is provided with a driving wheel 33, the driving wheel 33 is alternately provided with two convex tooth segments 34 and two empty tooth reset segments 35, the vibration frame 14 is provided with a toothed plate 36, and the two convex tooth segments 34 are alternately engaged with the toothed plate 36.

[0029] The two convex tooth segments 34 are both provided with gear teeth engaged with the toothed plate 36, the corresponding central angle of one convex tooth segment 34 is 30°, the corresponding central angle of the other convex tooth segment 34 is 60°, and the corresponding central angle of the two empty tooth reset segments 35 is both 135°.

[0030] The convex tooth segments 34 and the toothed plate 36 are both provided with a rubber coating layer, the thickness of the rubber coating layer is 0.2 mm, and the turnover shaft 27 is fixedly provided with a damping ring at the rotating connection position of the turnover shaft 27 and the rotating frame 4.

[0031] The first gear shaft 28 drives the third gear shaft 32 to rotate through the third bevel gear, the driving wheel 33 rotates synchronously, when the 30° central angle convex tooth segment 34 is engaged with the toothed plate 36, the vibration frame 14 is driven to generate short-stroke vibration, when the 60° central angle convex tooth segment 34 is engaged, the vibration frame 14 is driven to generate long-stroke vibration, when the empty tooth reset segment 35 rotates, the reset spring 31 pulls the vibration frame 14 to reset, and the cycle of short-stroke vibration, reset, long-stroke vibration and reset is formed, the rubber coating layer reduces the impact noise and component wear during engagement, and the damping ring reduces the vibration error caused by the rotating gap of the turnover shaft 27, and the technical problems of the traditional vibration mechanism, such as single vibration parameter, unable to simulate multi-working condition vibration, large engagement transmission noise, serious wear and the influence of the rotating gap of the turnover shaft 27 on the test precision are solved.

[0032] The technical effect of the application lies in that the convex tooth segments 34 with different central angles are matched with the empty tooth reset segments 35 to realize multi-stroke cyclic vibration. Through the multi-stroke cyclic vibration, the residual rate of tablets and tablet powders on the vibration frame 14 is effectively reduced. The microcontroller 3 is used as a core control unit to plan the whole situation, and the two servo motors 17 are used to realize independent driving of the rotating frame 4 and the driving gear ring 5, respectively, one of the servo motors 17 drives the rotating frame 4 to rotate clockwise through the rotating shaft 18, so that the four test systems on the rotating frame 4 are sequentially and circularly switched to the feeding, detecting, cleaning and turnover stations, and the other servo motor 17 drives the driving gear ring 5 to rotate through the first toothed belt driving shaft sleeve 19, so that the movements of the rotating frame 4 and the driving gear ring 5 do not interfere with each other. The lifting push rod 20 drives the test rack 2 to vertically slide according to the tablet specification, adjusts the relative height of the first visual probe 8, the glass cover 10 and other components and the test system; In the feeding and discharging station, the six-degree-of-freedom manipulator completes automatic feeding and discharging of the tablets to be tested, the first visual probe 8 captures and identifies the appearance defects of the tablets in the vertical direction, and the capacitive humidity sensor 9 non-contact collects the humidity data of the tablets in the horizontal direction. Both data are transmitted to the microcontroller 3 in real time, and the unqualified tablets with appearance damage or abnormal humidity are screened out to avoid entering the subsequent links. When the test system enters the detection station, the glass cover 10 covers the test area to form a closed space to prevent the tablets from splashing, the driving motor on the vibration frame 14 drives the bidirectional screw rod 26 to rotate through the first bevel gear, and the forward and reverse thread segments of the bidirectional screw rod 26 drive the two clamps 15 to synchronously slide and adjust the interval. After clamping the tablets, the clamps 15 pass through the test clamp hole 39 on the glass cover 10 through the pressure transmission block 16 connected with the pressure sensor, and the pressure sensor collects the force data of the tablets in real time and transmits it to the microcontroller 3. After the hardness test is completed, the driving ring gear 5 transmits power to the first gear shaft 28 of the vibration generating assembly through the follow-up gear 38 on the transmission shaft 37 and the driving bevel gear, the first gear shaft 28 drives the third gear shaft 32 and the driving wheel 33 to rotate through the third bevel gear, the convex tooth segments 34 on the driving wheel 33 with a central angle of 30° and 60° are alternately engaged with the tooth plate 36, and the vibration frame 14 is made to produce short stroke, reset, long stroke and reset cyclic vibration by cooperating with the reset spring 31, so as to reduce the residual rate of the tablets on the vibration frame 14 and the pressure transmission block 16 after the detection is completed. After the test is completed, the rotating frame 4 drives the test system to enter the cleaning station, the rotary motor 22 drives the negative pressure rotating cylinder 11 to rotate through the second gear belt, the outer wall bristles 23 of the negative pressure rotating cylinder 11 mechanically clean the pressure transmission block 16, and at the same time, the negative pressure dust collector 25 is started, negative pressure is generated in the inner cavity of the negative pressure rotating cylinder 11, the cleaned medicine powder is filtered through the brush net 24 and then sucked into the inner cavity, and component cleaning is realized. Subsequently, the test system enters the turnover station, when the test system rotates to the cleaning station and the turnover station, the turnover gear 30 of the vibration generating assembly is engaged with the inner side turnover ring gear 6, the second gear shaft 29 drives the first gear shaft 28 to rotate through the second bevel gear, and the turnover frame 13 is driven to turn over 180°, and the residual tablets fall into the waste collection box 21. When the test system rotates to the turnover station and the feeding and discharging station, the turnover gear 30 is engaged with the outer side reset ring gear 7, and the turnover frame 13 is driven to reset, preparing for the next cycle.

[0033] The above only describes the preferred embodiments of the present application and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A tablet hardness tester with a protective structure, comprising a frame (1), a test frame (2), a microcontroller (3), an independently rotatable rotating frame (4), and an active gear ring (5), characterized in that: The frame (1) is provided with loading and unloading stations, inspection stations, cleaning stations and flipping stations in a clockwise direction. Four testing systems are installed on the rotating frame (4). The frame (1) is equipped with flipping gear rings (6) and reset gear rings (7). The test frame (2) is equipped with a first visual probe (8), a capacitive humidity sensor (9), a glass cover (10) and a negative pressure rotary cylinder (11). A second visual probe (12) is located on the axis of the glass cover (10). The data terminals of the first visual probe (8), the capacitive humidity sensor (9) and the second visual probe (12) are all connected to the microcontroller (3). A negative pressure cleaning component is provided inside the negative pressure rotary cylinder (11). The testing system includes a rotating frame (13) rotatably connected to the rotating frame (4). The rotating frame (13) is driven to rotate 180° by the rotating gear ring (6) and reset by the reset gear ring (7). A vibration generating component is installed on the rotating frame (13). A vibrating frame (14) is provided on the vibration generating component. The vibration generating component meshes with the active gear ring (5) at the detection station and the rotating station. When the active gear ring (5) rotates, the vibration frequency and vibration stroke of the vibrating frame (14) change cyclically. Two adjustable clamps (15) are provided on the vibrating frame (14). Both clamps (15) are connected to pressure transmission blocks (16) through pressure sensors. The data terminal of the pressure sensor is connected to the microcontroller (3). Two symmetrical test clamp holes (39) adapted to the pressure transmission blocks (16) are opened on the glass cover (10).

2. The tablet hardness tester with a protective structure according to claim 1, characterized in that: The microcontroller (3) is fixedly mounted on the frame (1). Two servo motors (17) are mounted on the lower part of the frame (1). A rotating shaft (18) is fixedly mounted on the output shaft end of one of the servo motors (17). The end of the rotating shaft (18) is fixedly connected to the rotating frame (4). A bushing (19) is rotatably sleeved on the rotating shaft (18). The output shaft end of the other servo motor (17) is connected to the bushing (19) through a first toothed belt. The active gear ring (5) is fixedly mounted on the bushing (19). The test frame (2) is slidably connected to the frame (1). A vertically arranged lifting push rod (20) is installed between the test frame (2) and the frame (1).

3. The tablet hardness tester with a protective structure according to claim 1, characterized in that: The first visual probe (8) and the capacitive humidity sensor (9) are both set on the loading and unloading station. The axis of the first visual probe (8) is perpendicular to the horizontal plane, and the axis of the capacitive humidity sensor (9) is parallel to the horizontal plane. The glass cover (10) is set directly above the detection station. The negative pressure rotary drum (11) is set directly above the cleaning station. A waste collection box (21) with an open top is installed on the frame (1) at the position corresponding to the flipping station.

4. The tablet hardness tester with a protective structure according to claim 1, characterized in that: The negative pressure cleaning assembly includes a rotary motor (22) mounted on the test frame (2), a negative pressure cylinder (11) rotatably connected to the test frame (2), the output shaft end of the rotary motor (22) being connected to the negative pressure cylinder (11) via a second toothed belt, the outer wall of the negative pressure cylinder (11) being evenly distributed with bristles (23) for cleaning the pressure transmission block (16), a brush net (24) being installed on the inner bottom surface of the negative pressure cylinder (11), a negative pressure vacuum cleaner (25) being mounted on the test frame (2), and the negative pressure end of the negative pressure vacuum cleaner (25) being rotatably connected to the inner cavity of the negative pressure cylinder (11) via a rotary joint.

5. A tablet hardness tester with a protective structure according to claim 1, characterized in that: A bidirectional lead screw (26) is rotatably mounted on the vibrating frame (14). A drive motor is mounted on the bottom surface of the vibrating frame (14). A first bevel gear is mounted on the output shaft end of the drive motor and on the bidirectional lead screw (26). The two first bevel gears mesh orthogonally. A forward thread section and a reverse thread section are symmetrically arranged on the bidirectional lead screw (26). The forward thread section and the reverse thread section are respectively connected to two clamps (15). Both clamps (15) are slidably connected to the vibrating frame (14).

6. A tablet hardness tester with a protective structure according to claim 5, characterized in that: The vibration generating assembly includes a flip shaft (27) mounted on a flipping frame (13), the flip shaft (27) being rotatably connected to a rotating frame (4), a first gear shaft (28) being rotatably mounted on the inner wall of the flip shaft (27) via a bearing, a driven bevel gear being mounted at the tail end of the first gear shaft (28), a second gear shaft (29) being rotatably mounted on the rotating frame (4), a second bevel gear being mounted on both the first gear shaft (28) and the second gear shaft (29), the two second bevel gears being orthogonally meshed, a flip gear (30) being mounted on the second gear shaft (29) and meshing with the flipping gear ring (6) and the reset gear ring (7), the vibration frame (14) and the flipping frame (13) being connected... The vibrating frame (14) is slidably connected to the bottom surface of the vibrating frame (14), and a return spring (31) is installed on the bottom surface of the vibrating frame (14). The other end of the return spring (31) is fixedly connected to the flipping frame (13). A third gear shaft (32) is rotatably installed on the flipping frame (13). A third bevel gear is installed on both the third gear shaft (32) and the first gear shaft (28). The two third bevel gears mesh orthogonally. A drive wheel (33) is installed on the third gear shaft (32). Two convex tooth segments (34) and two empty tooth return segments (35) are alternately arranged on the drive wheel (33). A toothed plate (36) is installed on the vibrating frame (14). The two convex tooth segments (34) alternately mesh with the toothed plate (36).

7. A tablet hardness tester with a protective structure according to claim 6, characterized in that: The flipping gear ring (6) is located between the cleaning station and the flipping station, and the reset gear ring (7) is located between the flipping station and the loading / unloading station. The center angles of the flipping gear ring (6) and the reset gear ring (7) are both 45°. The flipping gear ring (6) is located inside the flipping gear (30), and the reset gear ring (7) is located outside the flipping gear (30).

8. A tablet hardness tester with a protective structure according to claim 6, characterized in that: Both of the convex tooth segments (34) are provided with teeth that mesh with the tooth plate (36). The central angle of one of the convex tooth segments (34) is 30°, the central angle of the other convex tooth segment (34) is 60°, and the central angle of both of the empty tooth reset segments (35) is 135°.

9. A tablet hardness tester with a protective structure according to claim 6, characterized in that: Both the toothed section (34) and the toothed plate (36) are provided with a rubber coating, and a damping ring is fixedly provided at the rotational connection between the flip shaft (27) and the rotating frame (4).

10. A tablet hardness tester with a protective structure according to claim 6, characterized in that: On the frame (1), a drive shaft (37) is rotatably installed at the position corresponding to the detection station and the flipping station. On both drive shafts (37), a drive bevel gear that meshes with the driven bevel gear is installed. On the drive shaft (37), a follower gear (38) that meshes with the drive gear ring (5) is installed.

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