A small product weighing device

Abstract

The invention relates to a small product weighing device, comprising a feeding mechanism, a conveying and transferring mechanism, a debris removing mechanism and a weighing mechanism, wherein: the feeding mechanism comprises a hopper, a stirring mechanism and a sorting mechanism, the conveying and transferring mechanism comprises a transfer hub, a guide seat and a servo motor, the debris removing mechanism comprises a guide fork, a trigger mechanism, a blowing device and a collecting box a, and the weighing mechanism comprises a weighing platform and a weighing sensor; the invention also comprises a discharging mechanism, the discharging mechanism comprises a discharging chute a, a discharging chute b, a removing door, a collecting box b and a collecting box c; the invention also comprises a control unit, the trigger mechanism and the weighing sensor transmit signals to the control unit, and the control unit can send instructions to the blowing device, the servo motor and the removing door to separate products that meet the weight requirements from products that do not meet the weight requirements; the invention solves the problem of disturbed airflow around the weighing platform due to vacuum leakage and the problem of long stabilization time during small product weighing, which affects production efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of weighing equipment, and in particular relates to a small product weighing device. Background Art

[0002] At present, the existing weighing devices in the pharmaceutical industry adopt two methods: one method uses vacuum adsorption to transport tablets or pills to the top of the weighing platform, and then release them onto the scale plate for weighing; the other method uses a vacuum adsorption wheel in conjunction with a transfer hub to transport tablets or pills to the weighing platform for weighing. Both methods have certain shortcomings, as follows:

[0003] The first method: when tablets or pills are weighed, the next adjacent tablet or pill to be weighed is rotating toward the weighing platform following the vacuum adsorption wheel. Because the tablet or pill cannot fit completely with the adsorption port, there is always partial vacuum leakage, which causes disturbed airflow around the weighing pan, affecting the precision weighing of the weighing sensor and making the weighing result inaccurate. The second method: because the vacuum adsorption wheel is used in conjunction with the transfer hub, the tablet or pill is sent by the adsorption wheel into the groove on the transfer hub and then thrown into the weighing pan. Because the weighing pan is large and has no quick positioning groove for small products, the stabilization time of the weighing sensor is prolonged after the tablet or pill falls on the weighing pan, resulting in a longer weighing cycle. Summary of the invention

[0004] The present invention provides a small product weighing device, which solves the above-mentioned problem of vacuum leakage leading to generation of disturbed airflow and the problem of prolonged stabilization time when weighing tablets or pills.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a small product weighing device, including a feeding mechanism, a conveying and transferring mechanism arranged below the feeding mechanism, the debris removing mechanism arranged on the conveying and transferring mechanism, and a weighing mechanism arranged below the conveying and transferring mechanism, wherein:

[0006] The feeding mechanism includes a hopper, a stirring mechanism and a sorting mechanism, the hopper is placed above the stirring mechanism, and the stirring mechanism outlet is connected to the sorting mechanism;

[0007] The conveying and transferring mechanism comprises a transfer hub, a guide seat and a servo motor. The circumferential surface of the transfer hub is provided with a plurality of grooves, and the bottoms of the plurality of grooves are provided with air blowing holes. The guide seat is adjacent to the transfer hub, and the output end of the servo motor is connected to the transfer hub.

[0008] The debris removal mechanism includes a guide fork, a trigger mechanism, an air blowing device and a collection box a, wherein the guide fork is arranged above the guide seat, the guide fork is close to the circumferential surface of the transfer hub, the trigger mechanism is arranged above the guide fork, and the trigger mechanism is close to the circumferential surface of the transfer hub; the air blowing device is installed in the middle of the guide fork;

[0009] The weighing mechanism comprises a weighing platform and a weighing sensor, wherein the weighing platform is arranged below the transfer hub, and the weighing platform is placed on the weighing sensor;

[0010] The discharging mechanism is arranged at the outlet end of the weighing mechanism.

[0011] Preferably, the blowing holes include a plurality of radial blowing holes and a plurality of axial blowing holes, the plurality of radial blowing holes are coaxial with the opening directions of the plurality of grooves, and the plurality of radial blowing holes are perpendicular to the axial blowing holes and are connected thereto.

[0012] Preferably, it also includes a plurality of radial air inlet holes, which are arranged in the middle of the transfer hub, are perpendicular to the axial blowing holes and connected thereto, and are parallel to the plurality of radial air inlet holes.

[0013] Preferably, the guide seat includes an arc-shaped conveying track, and the guide seat is in the shape of a right-angled triangle, whose hypotenuse is the arc-shaped conveying track, and the arc-shaped conveying track is adjacent to the circumferential surface of the transfer hub.

[0014] Preferably, the weighing platform includes a U-shaped guardrail, a V-shaped positioning groove and a base, the base is placed on the weighing sensor, the U-shaped guardrail is provided above the base, the V-shaped positioning groove is provided at the bottom of the hollow part of the U-shaped guardrail, and the opening surface of the U-shaped guardrail is aligned with the exit end of the arc-shaped conveying track.

[0015] Preferably, it also includes a discharging chute a, a discharging chute b, a rejection gate, a collection box b, and a collection box c, wherein the discharging chute a is located below the transfer hub, and the upper end surface of the discharging chute a is lower than the plane where the V-shaped positioning groove of the weighing platform is located; the discharging chute a channel is downwardly opened with the discharging chute b; the discharging chute a and the discharging chute b are connected with a rejection gate; the collection box b is provided at the bottom of the outlet end of the discharging chute a, and the collection box c is provided at the bottom of the outlet end of the discharging chute b.

[0016] Preferably, it further comprises a control unit, to which the trigger mechanism and the weighing sensor sensing signals are transmitted; and the control unit sends instructions to the blowing device, the servo motor and the rejection door.

[0017] Preferably, the blowing device includes a slider, a blowing nozzle and a compression spring, the slider is arranged in the middle of the guide fork and the bottom of the slider is adjacent to the outer circumferential surface of the transfer hub, the blowing nozzle is arranged inside the slider, and the compression spring is arranged on the outer sleeve of the blowing nozzle.

[0018] Through the above technical solution, compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention utilizes a conveying and transferring device to convey and transfer small products to a weighing platform without vacuum assistance. There is no interfering airflow around the weighing platform caused by vacuum leakage to affect the weighing result, thereby ensuring the accuracy of weighing and measuring of small products.

[0020] 2. The weighing platform used in the present invention has a V-shaped positioning groove and a U-shaped guardrail. After the small products enter the V-shaped groove in the U-shaped guardrail of the weighing platform, they can be quickly stabilized, which shortens the weighing time used for each small product and can improve the production capacity of the weighing equipment.

[0021] 3. The present invention uses a feed tube, a transfer hub and a servo motor to cooperate with each other to control the feeding of small products. No special gate opening / closing mechanism and control device are required, and the feeding of small products can be well controlled. The feeding mechanism of small products is simplified and has good synchronization, is simple and reliable, and reduces manufacturing costs.

[0022] 4. The debris removal mechanism of the present invention can remove the debris that enters the transfer hub groove together with the small products into the collection box a, effectively preventing the debris and the small products from being crushed when entering the arc conveying track at the same time, polluting the arc conveying channel and the weighing platform, and affecting the accuracy of subsequent weighing. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0024] Figure 1 It is a left view of the overall structure of the present invention;

[0025] Figure 2 It is a front view of the overall structure of the present invention;

[0026] Figure 3 It is a schematic diagram of the guide seat structure of the present invention;

[0027] Figure 4 It is a schematic diagram of the weighing platform structure of the present invention;

[0028] Figure 5 is a cross-sectional view of a transfer hub of the present invention;

[0029] Figure 6 is a perspective view of a transfer hub of the present invention;

[0030] Figure 7is a cross-sectional structural diagram of the conveying and transferring device of the present invention;

[0031] Figure 8 It is a schematic diagram of the structure of the blowing device of the present invention.

[0032] In the figure: 10, feeding mechanism; 11, hopper; 12, stirring mechanism; 13, sorting mechanism; 131, sorting channel; 132, feeding pipe; 20, conveying and transferring device; 21, transfer hub; 211, groove; 212, blowing hole; 2121, radial blowing hole; 2122, axial blowing hole; 213, radial air inlet hole; 22, guide seat; 221, arc conveying track; 23, servo motor; 30, debris removal mechanism; 31, guide fork; 32, trigger mechanism; 33, collection box a; 34, blowing device; 341, slider; 342, blowing nozzle; 343, compression spring; 40, weighing mechanism; 41, weighing platform; 411, U-shaped guardrail; 412, V-shaped positioning groove; 413, base; 42, weighing sensor; 50, discharging mechanism; 51, rejection door; 52, collection box b; 53, collection box c; 54, discharging chute a; 55, discharging chute b; 60, control unit. DETAILED DESCRIPTION

[0033] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0034] Existing weighing devices have problems such as airflow interference caused by vacuum leakage and a long stabilization time after the product reaches the weighing pan, which leads to a long weighing cycle. Therefore, the present invention provides a small product weighing device, which solves these problems and can well control the feeding of small products because the present invention does not require a special gate opening / closing mechanism and control device, simplifies the feeding mechanism of small products, has good synchronization, is simple and reliable in structure, and reduces manufacturing costs.

[0035] like Figure 1 and Figure 2As shown, the top of the present invention is a feeding mechanism 10, which includes a hopper 11, a stirring mechanism 12 and a sorting mechanism 13. The hopper 11 is placed above the stirring mechanism 12, and the discharge port of the stirring mechanism 12 is connected to the obliquely arranged sorting mechanism 13. The sorting mechanism 13 includes a sorting channel 131 and a discharge pipe 132. The discharge port of the stirring mechanism 12 is connected to a plurality of the sorting channels 131, and the outlet ends of the plurality of the sorting channels 131 are connected to the discharge pipes 132 arranged in a vertical direction. A conveying and transferring mechanism 20 is provided below the outlet end of the discharge pipe 132. The conveying and transferring mechanism 20 includes a transfer hub 21, a guide seat 22 and a servo motor 23. The guide seat 22 is adjacent to the transfer hub 21, and the output end of the servo motor 23 is connected to the transfer hub 21. The circumferential surface of the transfer hub 21 is provided with a plurality of grooves 211, and a blowing hole 212 is provided below the plurality of the grooves 211.

[0036] The present invention provides a debris removal mechanism 30 adjacent to the outer surface of the conveying and transferring mechanism 20. The debris removal mechanism 30 includes a guide fork 31, a trigger mechanism 32, a blowing device 34, and a collecting box a33. The guide fork 31 is provided above the guide seat 22. The bottom of the guide fork 31 is engaged with the top of the guide seat 22 through staggered protrusions. The guide fork 31 is adjacent to the circumferential surface of the transfer hub 21. The trigger mechanism 32 is provided above the guide fork 31. The trigger mechanism 32 has a trigger rod. The trigger rod is bent, and the bend is adjacent to the circumferential surface of the transfer hub 21. The middle part of the guide fork 31 (such as Figure 3 The blowing device 34 is installed at A. A weighing mechanism 40 is installed below the conveying and transferring mechanism 20. The weighing mechanism 40 includes a weighing platform 41 and a weighing sensor 42. The weighing platform 41 is arranged below the transfer hub 21, and the weighing platform 41 is placed on the weighing sensor 42.

[0037] The present invention also includes a discharging mechanism 50, which includes a rejection gate 51, a collection box b52, a collection box c53, a discharging chute a54 and a discharging chute b55. The discharging chute a54 is located below the transfer hub 21, and the upper end surface of the discharging chute a54 is lower than the bottom surface of the U-shaped groove on the weighing platform 41; the discharging chute a54 is provided with the discharging chute b55 downwardly; the discharging chute a54 is provided with a rejection gate 51 at the connection between the discharging chute a54 and the discharging chute b55; the collection box b52 is provided at the bottom of the outlet end of the discharging chute a54, and the collection box c53 is provided at the bottom of the outlet end of the discharging chute b55. The present invention also includes a control unit 60, and the signals sensed by the trigger mechanism 32 and the weighing sensor 42 are transmitted to the control unit 60; the control unit 60 can send instructions to the servo motor 23, the actuator blowing device 34 of the debris removal mechanism 30 and the removal door 51 in the discharging mechanism 50.

[0038] Example 1

[0039] The preferred solution of the present invention is as follows: a small product weighing device, according to the above structural description, this solution provides an optimal implementation scheme. Figure 3 As shown, the guide seat 22 is in the shape of a right triangle, and its hypotenuse is an arc-shaped conveying track 221, and the arc-shaped conveying track 221 is interlocked with the circumferential surface of the transfer hub 21. Figure 4 As shown, the weighing platform 41 includes a U-shaped guardrail 411, a V-shaped positioning groove 412 and a base 413. The base 413 is placed on the weighing sensor 42. The U-shaped guardrail 411 is provided above the base 413. The V-shaped positioning groove 412 is provided at the bottom of the hollow part of the U-shaped guardrail 411. The opening surface of the U-shaped guardrail 411 is aligned with the exit end of the arc conveying track 221.

[0040] like Figure 6 As shown, a plurality of radial air inlet holes 213 are provided in the middle of the transfer hub 21, and a plurality of toothed discs parallel to each other and equidistant are provided on both sides of the plurality of radial air inlet holes 213 on the circumferential surface of the transfer hub 21, and the plurality of toothed discs are distributed on the cylindrical surface of the transfer hub 21. The toothed disc is provided with a plurality of grooves 211, and the toothed disc is embedded in the arc-shaped conveying track 221 and has gaps on both sides of the arc-shaped conveying track 221. When the grooves 211 on the toothed disc in the transfer hub 21 rotate to the arc-shaped conveying track 221, the plurality of grooves 211 on the toothed disc and the arc-shaped conveying track 221 form closed small spaces, so that the small products in the grooves 211 will not roll off.

[0041] like Figure 5As shown, the opening of the groove 211 is close to the side where the small product enters, and the top of the opening has a chamfer. This structure ensures that the small product can better enter the interior of the groove 211. When the small product falls from the discharge pipe 132, the inclined surface can guide the small product into the groove 211 below in advance, so that the small product falls into the groove 211 more smoothly. The blowing holes 212 include radial blowing holes 2121 and axial blowing holes 2122. Several of the radial blowing holes 2121 are coaxial with the opening directions of several of the grooves 211. Several of the radial blowing holes 2121 are perpendicular to and connected with the axial blowing holes 2122. The radial air inlet holes 213 are perpendicular to and connected with the axial blowing holes 2122, and the radial air inlet holes 213 are parallel to the several radial air holes 2121.

[0042] like Figure 7 and Figure 8 As shown, the air blowing device 34 in this solution is in contact with the circumferential surface of the transfer hub 21 through the arc surface of a slider 341, and an air blowing nozzle 342 is provided in the middle of the slider 341. In order to prevent air leakage from occurring on the circumferential contact surface between the slider 341 and the transfer hub 21 and thus affecting the removal of debris, a compression spring 343 is sleeved on the air blowing device 34, and the compression spring 343 makes the arc surface of the slider 341 always in close contact with the circumferential surface of the transfer hub 21.

[0043] The specific operation process of this scheme is: put bulk tablets, pills or other small products into the hopper 11, stir them through the stirring mechanism 12, and convey the small products to the sorting mechanism 13. The small products are sent out from the outlet of the stirring mechanism 12, and are sorted in a single longitudinal column through the sorting channel 131 on the sorting mechanism 13. Then, the small products are guided by the discharge pipe 132 and conveyed to the groove 211 on the transfer hub 21.

[0044] The transfer hub 21 rotates counterclockwise, and when the groove 211 rotates to below the discharge tube 132, under the action of gravity, the small product will automatically fall into the groove 211. When the groove 211 rotates to the trigger mechanism 32, if debris enters the transfer hub 21, the trigger mechanism 32 will transmit the sensing signal to the control unit 60, and the control unit 60 will transmit the control signal to the solenoid valve (not shown in the figure) in the debris removal mechanism 30. The solenoid valve opens, and compressed air passes through the blowing nozzle 342 on the blowing device 34 and blows into the radial air inlet 213 connected to the axial blowing hole 2122, and a group of twelve radial blowing holes 2121 connected to the axial blowing hole 2122 will simultaneously blow out all objects in the groove 211, pass through the removal channel on the guide fork 31, and fall into the collection box a33.

[0045] When the groove 211 containing the small product rotates to the exit of the arc conveying track 221, the transfer hub 21 will bring the small product in the groove 211 into the weighing platform 41. After the V-shaped positioning groove 412 is quickly positioned, the weighing sensor 42 measures the weight of the small product in time. Due to the rotation of the transfer hub 21, the small product on the weighing platform 41 is brought into the discharge chute a54. The weighing sensor 42 transmits the obtained data signal to the control unit 60. If the obtained weight is within the qualified range, the control unit 60 controls the rejection gate 51 to switch to the discharge chute a54, and the qualified products will enter the collection box b52 through the discharge chute a54. If the obtained weight is not within the qualified range, it is a defective product. The control unit 60 controls the rejection gate 51 to switch to the discharge chute b55, and the defective products will slide into the collection box c53 through the discharge chute b55.

[0046] The transfer hub 21 rotates intermittently according to the set graduation value driven by the servo motor 23, and can continuously obtain the weighing and sorting results of the same product. By combining several groups of such devices adjacently, the production capacity can be increased by several times, and high-speed weighing can be achieved.

[0047] The present invention utilizes the conveying and transferring device 20 to convey and transfer small products to the weighing platform 41 without vacuum assistance. Different from the existing vacuum adsorption method, there will be no interfering airflow around the weighing platform 41 of the present invention due to vacuum leakage that affects the weighing result, thereby ensuring the accuracy of the weighing and measurement of small products.

[0048] The weighing platform 41 used in the present invention has a V-shaped positioning groove 412 and a U-shaped guardrail 411. After the small products enter the V-shaped positioning groove 412 in the U-shaped guardrail 411 of the weighing platform 41, they can be quickly stabilized, thereby shortening the weighing time used for each small product and improving the production capacity of the weighing equipment.

[0049] The present invention uses the unloading tube 132, the transfer hub 21 (toothed disk) and the servo motor 23 to cooperate with each other to control the feeding of small products. No special gate opening / closing mechanism and control device are required, and the feeding of small products can be well controlled. The unloading mechanism of small products is simplified and has good synchronization, simple and reliable structure, and reduced manufacturing costs.

[0050] The debris removal mechanism 30 of the present invention can remove the debris that enters the groove 211 of the transfer hub 21 together with the small products into the collection box a33, effectively preventing the debris and the small products from being crushed when entering the arc conveying track 311 at the same time, contaminating the arc conveying channel 311 and the weighing platform 41, and affecting the weighing accuracy.

[0051] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as generally understood by those skilled in the art to which this application belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as herein.

[0052] The meaning of "and / or" described in this application means that the situations where each exists alone or both exist at the same time are included.

[0053] The term “connection” as used in this application may mean a direct connection between components or an indirect connection between components via other components.

[0054] Based on the above, the ideal embodiment of the present invention is the inspiration. Through the above description, the relevant staff can make various changes and modifications without deviating from the technical idea of ​​the present invention. The technical scope of the present invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A weighing device for small products, characterized in that: The invention comprises a feeding mechanism (10), a conveying and transferring mechanism (20) arranged below the feeding mechanism (10), a debris removing mechanism (30) arranged on the conveying and transferring mechanism (20), a weighing mechanism (40) arranged below the conveying and transferring mechanism (20), and a discharging mechanism (50), wherein: The feeding mechanism (10) comprises a hopper (11), a stirring mechanism (12) and a sorting mechanism (13); the hopper (11) is placed above the stirring mechanism (12); and the discharge port of the stirring mechanism (12) is connected to the sorting mechanism (13); The conveying and transferring mechanism (20) comprises a transfer hub (21), a guide seat (22) and a servo motor (23); a plurality of grooves (211) are provided on the circumferential surface of the transfer hub (21); and a plurality of blowing holes (212) are provided at the bottom of the grooves (211); the guide seat (22) is adjacent to the transfer hub (21); and an output end of the servo motor (23) is connected to the transfer hub (21); The blowing holes (212) include a plurality of radial blowing holes (2121) and a plurality of axial blowing holes (2122); the plurality of radial blowing holes (2121) are coaxial with the opening direction of the plurality of grooves (211); and the plurality of radial blowing holes (2121) are perpendicular to the axial blowing holes (2122) and are in communication with the axial blowing holes (2122); It also includes a plurality of radial air inlet holes (213), wherein the radial air inlet holes (213) are arranged in the middle of the transfer hub (21), the radial air inlet holes (213) are all perpendicular to the axial air blowing holes (2122) and are connected thereto, and the radial air inlet holes (213) are parallel to the plurality of radial air blowing holes (2121); The debris removal mechanism (30) comprises a guide fork (31), a trigger mechanism (32), a collection box a (33) and an air blowing device (34); the guide fork (31) is arranged above the guide seat (22); the guide fork (31) is in close proximity to the circumferential surface of the transfer hub (21); the trigger mechanism (32) is arranged above the guide fork (31); the trigger mechanism (32) is in close proximity to the circumferential surface of the transfer hub (21); the air blowing device (34) is installed in the middle of the guide fork (31); The air blowing device (34) comprises a slider (341), an air blowing nozzle (342) and a compression spring (343); the slider (341) is arranged in the middle of the guide fork (31) and the bottom of the slider (341) is in close proximity to the outer circumferential surface of the transfer hub (21); the air blowing nozzle (342) is arranged inside the slider (341) and the compression spring (343) is arranged on the outer cover of the air blowing nozzle (342); The weighing mechanism (40) comprises a weighing platform (41) and a weighing sensor (42), wherein the weighing platform (41) is arranged below the transfer hub (21), and the weighing platform (41) is placed on the weighing sensor (42); The material discharging mechanism (50) is arranged at the outlet end of the weighing mechanism (40).

2. A small product weighing device according to claim 1, characterized in that: The guide seat (22) comprises an arc-shaped conveying track (221); the guide seat (22) is in the shape of a right-angled triangle, the hypotenuse of which is the arc-shaped conveying track (221); the arc-shaped conveying track (221) is closely adjacent to the circumferential surface of the transfer hub (21).

3. A small product weighing device according to claim 2, characterized in that: The weighing platform (41) comprises a U-shaped guardrail (411), a V-shaped positioning groove (412) and a base (413); the base (413) is placed on the weighing sensor (42); the U-shaped guardrail (411) is arranged above the base (413); the V-shaped positioning groove (412) is arranged at the bottom of the hollow part of the U-shaped guardrail (411); and the opening surface of the U-shaped guardrail (411) is aligned with the exit end of the arc-shaped conveying track (221).

4. A small product weighing device according to claim 3, characterized in that: It also includes a discharge chute a (54), a discharge chute b (55), a rejection gate (51), a collection box b (52), and a collection box c (53), wherein the discharge chute a (54) is located below the transfer hub (21), and the upper end surface of the discharge chute a (54) is lower than the plane where the V-shaped positioning groove (412) is located; the discharge chute b (55) is opened downward on the channel of the discharge chute a (54); the rejection gate (51) is provided at the connection between the discharge chute a (54) and the discharge chute b (55); the collection box b (52) is provided at the bottom of the outlet end of the discharge chute a (54), and the collection box c (53) is provided at the bottom of the outlet end of the discharge chute b (55).

5. A small product weighing device according to claim 4, characterized in that: It also includes a control unit (60), to which the induction signals of the trigger mechanism (32) and the weighing sensor (42) are transmitted; and the control unit (60) sends instructions to the blowing device (34), the servo motor (23) and the rejection door (51).

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