A continuous weighing system and weighing method for small products

Abstract

This invention belongs to the fields of pharmaceuticals, food, chemicals, and processing manufacturing technology, specifically relating to a continuous weighing system and method for small parts. The weighing system is mounted on a support frame. The system includes a feeding mechanism, a conveying and transferring mechanism, a push rod, a pushing mechanism, a resetting mechanism, a weighing mechanism, and a linkage following mechanism. The feeding mechanism is located at the top of the support frame, and the conveying and transferring mechanism is located below it. The conveying and transferring mechanism includes a transfer wheel, several first channels, several sliders, several first grooves, and a guide seat. The pushing mechanism is located on one side of the transfer wheel, and the resetting mechanism pushes the sliders connected to the push rod to slide along the first channels in the initial direction. The weighing mechanism is located below the transfer wheel. This invention utilizes the conveying and transferring mechanism to prevent small parts from being deformed due to compression during the entire conveying and transferring process, reducing the risk of breakage and powder leakage.

Description

Technical Field

[0001] This invention belongs to the fields of pharmaceutical, food, chemical and processing manufacturing technology, and specifically relates to a continuous weighing system and weighing method for small products. Background Technology

[0002] Currently, there are two main types of continuous weighing mechanisms internationally. One type involves the capsule being pushed from the feed tube into the corresponding groove on the transfer wheel. The groove width is smaller than the capsule's outer diameter, preventing the capsule from falling out. When the groove rotates above the weighing platform, a fork pulls the capsule out of the groove and onto the platform for weighing. In this transfer method, the capsule is compressed, posing a risk of breakage and powder leakage. Additionally, if a capsule is highly deformed, the groove may not be able to hold it, causing it to fall onto the platform before weighing.

[0003] The second mechanism involves a capsule entering the guide channel from the feed pipe and landing on the front teeth of a rotating transfer disc that works in conjunction with the guide channel. Under gravity, the capsule slides down the guide channel along the front teeth and stops on the weighing platform. Because the distance between two adjacent teeth on the transfer disc is greater than the length of the capsule being weighed, the capsule remains on the weighing platform for weighing during the time it takes for the front teeth to leave the front of the capsule and for the rear teeth to reach the rear of the capsule. The rear teeth then push the capsule off the platform, completing one weighing cycle. If the transfer disc's rotation speed exceeds the capsule's downward speed, the rear teeth on the transfer disc will directly push the rear of the capsule along the guide channel into the weighing platform. The capsule is weighed while being pushed by the rear teeth, resulting in inaccurate weighing results. If the transfer disc's rotation speed is below a certain value, the capsule will decelerate or even stop as it enters the weighing platform at the bottom exit of the guide channel. It will disengage from the front teeth on the rotating transfer disc and be pushed onto the weighing platform by the rear teeth. Similar to the previous situation, the capsule is also weighed while being pushed by the rear teeth on the transfer disc, resulting in inaccurate weighing results. Within the normal weighing speed range, the position of the capsule landing on the weighing platform may not be consistent. If the selected weighing time period is not reasonable, the weighing accuracy will be affected. Summary of the Invention

[0004] This invention provides a continuous weighing system and method for small products, which solves the above-mentioned problems and realizes continuous and rapid weighing of small products.

[0005] The technical solution adopted by this invention to solve its technical problem is: a continuous weighing system for small parts, comprising a support, a feeding mechanism, a conveying and transferring mechanism, several push rods, a pushing mechanism, several resetting mechanisms, a weighing mechanism, a discharge channel, and a linkage following mechanism, wherein:

[0006] The feeding mechanism is located on the top of the support, and the feeding mechanism is used to transport a number of the small products in a single longitudinal column into the conveying and transfer mechanism.

[0007] The conveying and transferring mechanism is located below the feeding mechanism, and the conveying and transferring mechanism is used to convey several small products one by one to the weighing mechanism;

[0008] The conveying and transferring mechanism includes a transfer wheel, a plurality of first channels, a plurality of sliders, a plurality of first grooves, and a guide seat. The transfer wheel is disposed below the feeding mechanism. The plurality of first channels are equidistantly axially formed on the outer circumferential surface of the transfer wheel, and the sliders are disposed in the first channels. The plurality of first grooves are equidistantly axially formed on the outer circumferential surface of the transfer wheel between each pair of first channels. The guide seat is adjacent to a portion of the outer circumferential surface of the transfer wheel.

[0009] The push rod is disposed at one end of the slider along the axial direction of the slider.

[0010] The pushing mechanism is located on one side of the transfer wheel, and the pushing mechanism and the push rod are located on the same side of the transfer wheel. The pushing mechanism is used to push the slider connected to the push rod to slide along the first channel away from the pushing mechanism.

[0011] The reset mechanism is used to push the slider connected to the push rod to slide along the first channel toward the initial position;

[0012] The weighing mechanism is located below the transfer wheel and fixed on the bracket. The weighing mechanism is used to weigh each of the small products individually.

[0013] The discharge channel is located below the weighing mechanism on the side away from the guide seat, and the discharge channel is used to transport the weighed small parts out.

[0014] The linkage following mechanism is located above the discharge channel and is used to prevent the small parts from slipping off the weighing mechanism into the external environment due to inertia.

[0015] As a further preferred embodiment of the present invention, the first groove includes a limiting portion, a first inclined surface, a second inclined surface, and a channel segment. The bottom of the first groove is divided into a channel segment, a first inclined surface, a limiting portion, and a second inclined surface in sequence along the rotation direction of the transfer wheel. The limiting portion is formed by the intersection of the first inclined surface and the second inclined surface in the direction of the middle of the transfer wheel. The first inclined surface, the limiting portion, and the second inclined surface have a V-shaped structure. The bottom surface of the channel segment is concentric with and equidistant from the outer circle of the transfer wheel.

[0016] As a further preferred embodiment of the present invention, the linkage following mechanism includes a cam structure, a swing shaft, a fixed frame, a roller swing arm, and several stop levers. The cam structure is arranged in a circular shape around the outer circumference of the transfer wheel. The swing shaft is axially positioned above the discharge channel along the transfer wheel. The fixed frame is located on both sides of the discharge channel and connected to both ends of the swing shaft. The swing arm is positioned above the swing shaft. The roller is positioned at the top of the swing arm and is tangent to the circular structure formed by the cam structure. Several stop levers are equidistantly distributed on the side of the swing shaft facing the transfer wheel, and each stop lever is aligned with the outlet direction of one of the weighing mechanisms.

[0017] As a further preferred embodiment of the present invention, a plurality of the sliders reciprocate axially within the first channel.

[0018] As a further preferred embodiment of the present invention, a plurality of the sliders reciprocate radially within the first channel.

[0019] As a further preferred embodiment of the invention, it further includes a plurality of second grooves, which are equidistantly formed on the side of the slider facing the external environment; the spacing between any two second grooves is the same as the spacing between any two first grooves.

[0020] As a further preferred embodiment of the present invention, the pushing mechanism includes a first cam and a first pushing portion, wherein the first pushing portion is formed by a portion of the first cam extending toward the transfer wheel from one side toward the transfer wheel.

[0021] As a further preferred embodiment of the present invention, the pushing mechanism includes a second cam and a second pushing part, wherein the second pushing part is formed by an upwardly protruding portion on the top surface of the second cam.

[0022] A weighing method for a continuous weighing system for small products is also provided, comprising the following steps:

[0023] Step 1, unloading small parts: The unloading mechanism conveys several small parts in a single longitudinal column into the first groove in the transfer wheel;

[0024] Step 2, conveying of small parts: The conveying and transfer mechanism conveys several small parts one by one to the weighing mechanism;

[0025] Step 2-1: As the transfer wheel rotates, the push rod that reaches the first cam will move along the first cam towards the transfer wheel.

[0026] Step 2-2: As the transfer wheel rotates, the push rod that reaches the first pushing part gradually moves to its limit position;

[0027] During the period from the beginning of step 2-1 to the end of step 2-2, the second groove gradually connects with the first groove;

[0028] Steps 2-3: When the second groove is fully connected to the first groove, the small part reaches the weighing mechanism, and at the same time, the stop bar is aligned with the outlet direction of the weighing mechanism.

[0029] Step 3: Weighing of small parts: The weighing mechanism weighs the small parts.

[0030] Step 4: As the transfer wheel rotates, the stop bar aligned with the outlet direction of the weighing mechanism is raised; the side wall of the first channel above the weighing mechanism pushes the small part on the weighing mechanism into the discharge channel;

[0031] Step 5, continuous weighing: Repeat steps 1 to 4 in a loop.

[0032] A weighing method for a continuous weighing system for small products is also provided, comprising the following steps:

[0033] Step 1, unloading small parts: The unloading mechanism conveys several small parts in a single longitudinal column into the first groove in the transfer wheel;

[0034] Step 2, conveying of small parts: The conveying and transfer mechanism conveys several small parts one by one to the weighing mechanism;

[0035] Step 2-1: As the transfer wheel rotates, the push rod that reaches the second cam will move upward along the opening direction of the second cam;

[0036] Step 2-2: As the transfer wheel rotates, the push rod that reaches the protruding part of the second pushing part gradually moves to its limit position;

[0037] During the period from the beginning of step 2-1 to the end of step 2-2, the first channel gradually connects with the first groove;

[0038] Steps 2-3: When the first channel and the first groove are fully connected, the small part reaches the weighing mechanism, and at the same time, the stop bar is aligned with the outlet direction of the weighing mechanism.

[0039] Step 3: Weighing of small parts: The weighing mechanism weighs the small parts.

[0040] Step 4: As the transfer wheel rotates, the stop bar aligned with the outlet direction of the weighing mechanism is raised; the side wall of the first channel above the weighing mechanism pushes the small part on the weighing mechanism into the discharge channel;

[0041] Step 5, continuous weighing: Repeat steps 1 to 4 in a loop.

[0042] By employing the above technical solutions, the present invention has the following beneficial effects compared to the prior art:

[0043] 1. This invention is a continuous conveying and transfer method, which shortens the time for small products to be placed on and off the weighing platform. While ensuring the same weighing time, it shortens the weighing cycle of each small product, greatly speeds up the weighing speed of small products, and achieves high-speed weighing.

[0044] 2. The present invention utilizes a conveying and transfer mechanism, which prevents small parts from being squeezed and deformed during the entire conveying and transfer process, reduces the risk of damage or powder leakage of small parts, and can also accommodate the weighing of small parts with a certain amount of deformation.

[0045] 3. The small parts, conveying and transferring mechanism and weighing mechanism of this invention have good synchronization. The landing points on the weighing platform are neat and the weighing time is consistent. Whether weighing at high speed or low speed, it is not affected by inertial force and friction. The weighing mechanism has good stability, little interference and guaranteed accuracy.

[0046] 4. The present invention has a linkage following mechanism in front of the weighing platform. When the small product slides onto the weighing platform, the stop bar falls down and blocks in front of the small product, so that the small product can be stopped at the upper limit of the weighing platform.

[0047] 5. After weighing is completed, the rollers that are close to the cam block drive the stop lever to lift, keeping the small parts unobstructed from being discharged. The stop lever swings up and down once after each weighing action of a small part is completed. Attached Figure Description

[0048] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0049] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0050] Figure 2 This is a schematic diagram of the overall structure of a cam structure according to the present invention;

[0051] Figure 3 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0052] Figure 4 This is a schematic diagram of the transfer wheel structure in Embodiment 1 of the present invention;

[0053] Figure 5 This is a schematic diagram of the pushing mechanism structure in Embodiment 1 of the present invention;

[0054] Figure 6 This is a schematic diagram of the overall structure of Embodiment 2 of the present invention;

[0055] Figure 7 This is a schematic diagram of the transfer wheel structure in Embodiment 2 of the present invention;

[0056] Figure 8 This is a schematic diagram of the pushing mechanism structure in Embodiment 2 of the present invention;

[0057] Figure 9 This is a schematic diagram of the overall structure of another cam structure of the present invention;

[0058] Figure 10 This is a schematic diagram of the overall structure of the weighing platform of the present invention;

[0059] Figure 11 This is a schematic diagram of the first groove structure of the present invention.

[0060] In the diagram: 1. Small parts; 2. Feeding mechanism; 3. Conveying and transferring mechanism; 31. Transfer wheel; 32. First channel; 33. Slider; 331. Second groove; 34. First groove; 341. Limiting part; 342. First inclined surface; 343. Second inclined surface; 344. Channel section; 35. Guide seat; 36. Stop bar channel; 4. Push rod; 5. Pushing mechanism; 51. First cam; 52. First pushing part; 53. Second cam; 54. Second pushing part; 6. Weighing mechanism; 61. Weighing platform; 611. Positioning groove; 612. Platform; 613. Base; 62. Weighing sensor; 71. Cam structure; 711. Cam block; 712. Cam groove; 72. Swing shaft; 73. Fixing frame; 74. Roller; 75. Swing arm; 76. Stop bar; 8. Slide rail; 9. Discharge channel. Detailed Implementation

[0061] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0062] This application provides a continuous weighing system for small parts. The weighing system is mounted on a support (not shown in the attached drawings), which is used to fix and support the weighing system. Figures 1 to 11As shown, this weighing system includes a feeding mechanism 2, a conveying and transferring mechanism 3, several push rods 4, a pushing mechanism 5, several reset mechanisms, a weighing mechanism 6, a linkage following mechanism, and a discharge channel 9. The small product 1 is a capsule, a capsule-shaped tablet, or other similar product. The conveying and transferring mechanism 3 includes a transfer wheel 31, several first channels 32, several sliders 33, several first grooves 34, and a guide seat 35. The weighing mechanism 6 includes several weighing platforms 61 and weighing sensors 62. The linkage following mechanism includes a cam structure 71, a swing shaft 72, a fixed frame 73, a roller 74, a swing arm 75, and several stop levers 76.

[0063] like Figure 1 As shown, the above-mentioned unloading mechanism 2 is set on the top of the support. The unloading mechanism 2 is used to output a number of small products 1 in a single vertical arrangement from the outlet of the unloading mechanism 2 to the conveying and transfer mechanism 3. That is, the small products 1 fall into the conveying and transfer mechanism 3 in a vertical arrangement.

[0064] The aforementioned conveying and transfer mechanism 3 is located below the unloading mechanism 2. The conveying and transfer mechanism 3 is used to individually convey several small parts 1 to the weighing mechanism 6. The transfer wheel 31 in the conveying and transfer mechanism 3 is located below the unloading mechanism 2. Several first channels 32 are axially spaced on the outer circumferential surface of the transfer wheel 31 (the number of first channels 32 corresponds to the number of workstations in this weighing system). A slider 33 is installed within each first channel 32. Several first grooves 34 are axially spaced at equal intervals on the outer circumferential surface of the transfer wheel 31 between each pair of first channels 32. A guide seat 35 is adjacent to a portion of the outer circumferential surface of the transfer wheel 31. The transfer wheel 31 is located directly below the outlet of the unloading mechanism 2. The transfer wheel 31 always rotates towards the guide seat 35. The rotation of the transfer wheel 31 is achieved by a drive mechanism, which can be a servo motor. When the outer circumferential surface of the transfer wheel 31 rotates to be adjacent to the guide seat 35, a receiving cavity is formed between the first grooves 34 on the transfer wheel 31 and the guide seat 35 to prevent the small parts 1 from falling off.

[0065] like Figure 11As shown, the first groove 34 includes a limiting part 341, a first inclined surface 342, a second inclined surface 343, and a channel section 344. The bottom of the first groove 34 is divided into the channel section 344, the first inclined surface 342, the limiting part 341, and the second inclined surface 343 in sequence along the rotation direction of the transfer wheel 31. The bottom surface of the channel section 344 is concentric with and equidistant from the outer circle of the transfer wheel. The intersection of the first inclined surface 342 and the second inclined surface 343 is recessed towards the bottom of the first groove 34 to form the limiting part 341. The first inclined surface 342, the limiting part 341, and the second inclined surface 343 have a V-shaped structure, which expands the falling range of the small part 1. The limiting part 341 is the lowest point of the first groove 34 and plays a limiting role for the small part 1. When the small part 1 in the unloading mechanism 2 falls into the first groove 34, the small part 1 falls vertically to the limiting part 341. One end of the small part 1 contacts the limiting part 341, and the other end protrudes from the opening of the first groove 34 (this is to prevent two or more small parts 1 from entering the first groove 34 on the conveying and transfer mechanism 3 at the same time. The fact that one end of the small part 1 protrudes from the opening of the first groove 34 plays a certain role in controlling the unloading of the unloading mechanism 2). As the transfer wheel 31 rotates, the small part 1 will fall onto the first inclined surface 342 in the first groove 34. At this time, the first inclined surface 342 plays a positioning role for the falling small part 1, keeping the small part 1 in an inclined state in the first groove 34 with its lower end tightly against the limiting part 341. When the first groove 34 containing the small part 1 moves to below the transfer wheel 31, the small part 1 falls directly onto the guide seat 35, and the small part 1 contacts the guide seat 35 in a lying position. This position facilitates the transport of the small part 1 to the weighing mechanism 6 for weighing. The combination of the first inclined surface 342, the limiting part 341, and the second inclined surface 343 allows the small part 1 to be sorted and enter the first groove 34 from the feeding mechanism 2 by rotating the transfer wheel 31 without the need for a dedicated feeding gate to open and close. This simplifies the overall structure of the feeding mechanism 2.

[0066] like Figure 1 As shown, the push rod 4 is axially disposed on one end of the slider 33. The pushing mechanism 5 is disposed on one side of the transfer wheel 31, and the pushing mechanism 5 and the push rod 4 are located on the same side of the transfer wheel 31. The pushing mechanism 5 is used to push the slider 33 connected to the push rod 4 to slide along the first channel 32 away from the pushing mechanism 5.

[0067] The aforementioned weighing mechanism 6 is located below the transfer wheel 31 and fixed to the bracket. The weighing mechanism 6 is used to weigh each small product 1 individually. Figure 6 As shown, the weighing mechanism 6 includes several weighing platforms 61 and weighing sensors 62. The weighing platforms 61 are positioned directly below the transfer wheel 31, and the weighing sensors 62 are positioned below the weighing platforms 61. Figure 10 As shown, the weighing platform 61 includes a positioning groove 611, a platform 612, and a base 613. The base 613 is positioned above the load cell 62. The positioning groove 611 is located above the base 613, and its channel is coaxial with the bottom outlet direction of the transfer wheel 31. The platform 612 forms two sides of the opening of the positioning groove 611. The platform 612 is inclined to prevent dust from accumulating on the platform 612. The radial width of the positioning groove 611 is smaller than the outer diameter of the small part 1, thereby supporting and positioning the small part 1. The discharge channel 9 is located below the side of the weighing mechanism 6 away from the guide seat 35. The discharge channel 9 is used to transport the weighed small part 1 out.

[0068] The aforementioned linkage following mechanism is located above the discharge channel 9. This mechanism prevents small parts 1 from slipping off the weighing mechanism 6 into the external environment due to inertia. The linkage following mechanism includes a cam structure 71, a swing shaft 72, a fixed frame 73, a roller 74, a swing arm 75, and several stop levers 76. The cam structure 71 forms a circular structure along the outer circumference of the transfer wheel 31. The swing shaft 72 is axially positioned above the discharge channel 9 along the transfer wheel 31. The fixed frame 73 is located on both sides of the discharge channel 9 and connected to both ends of the swing shaft 72. The swing arm 75 is positioned above the swing shaft 72. The roller 74 is located at the top of the swing arm 75 and is tangent to the circular structure formed by the cam structure 71. Several stop levers 76 are equidistantly distributed on the side of the swing shaft 72 facing the transfer wheel 31, and each stop lever 76 is aligned with a weighing platform 61.

[0069] The aforementioned cam structure 71 has two forms. The first form is as follows: Figure 2 and Figure 7 As shown, the cam structure 71 is composed of several cam blocks 711. These cam blocks 711 are mounted on the outer circumferential surface of the transfer wheel 31 between each pair of first channels 32. The cam blocks 711 are arranged in a circle along the outer circumferential surface of the transfer wheel 31 to form a circular structure. The cam blocks 711 are fixedly mounted on the transfer wheel 31 using bolt assemblies. The side of the cam block 711 facing the external environment is an arc-shaped surface. The two ends of the arc-shaped surface are not on the same plane, causing the roller 74 to roll along the arc-shaped surface of the cam block 711 and generate radial displacement. This drives the swing shaft 72 to swing back and forth, causing the stop lever 76 to swing up and down at the outlet of the weighing platform 61. This prevents the small part 1 from sliding out of the positioning groove 611 due to inertia when it falls into the positioning groove 611 of the weighing platform 61 as the transfer wheel 31 rotates. The second method, as... Figure 9As shown, a circular cam structure 71 with several cam grooves 712 is installed at any position on the outer circumference of the transfer wheel 31. The side of the cam groove 712 facing the external environment is an arc surface. The two ends of the arc surface are not on the same plane, one high and one low. When the cam structure 71 rotates with the transfer wheel 31, the roller 74 rolls along the arc surface on the cam groove 712 and generates radial displacement. This drives the swing shaft 72 to swing back and forth, causing the stop lever 76 to swing up and down at the outlet of the weighing platform 61.

[0070] like Figure 4 As shown, this application also includes a stop channel 36, which is formed on the side of the first groove 34 facing the rotation direction of the transfer wheel 31. The groove width of the stop channel 36 is smaller than the radial width of the small part 1. The number of first channels 32, sliders 33, and push rods 4 is the same, which corresponds to the number of workstations on the transfer wheel 31. The number of first grooves 34 and stop channels 36 corresponds to the number of groups on one workstation. Preferably, the number of first channels 32 and the number of workstations on the transfer wheel 31 are 6, and the number of first grooves 34 is 12 per group, for a total of 6 groups.

[0071] Example 1

[0072] This embodiment provides a preferred implementation scheme, based on the above structure, such as Figures 3 to 5 As shown, in this embodiment, several sliders 33 reciprocate axially within the first channel 32. The reset mechanism can be any mechanical structure capable of resetting the push rod 4 from its extreme position to its initial position. Preferably, the reset mechanism can be an elastic element, which is disposed on the side wall of the first channel 32 away from the push rod 4. The elasticity of the elastic element resets the push rod 4 from its extreme position to its initial position. Preferably, the reset mechanism can be a mechanical structure combining an elastic element and a guide rail. The guide rail is installed axially along the first channel 32, the sliders 33 within the first channel 32 slide along the guide rail, and the elastic element is installed on the guide rail. The elasticity of the elastic element resets the push rod 4 from its extreme position to its initial position. Figure 5 As shown, the pushing mechanism 5 includes a first cam 51 and a first pushing part 52. The first cam 51 has a semi-circular arc shape, with its opening facing upwards. The first pushing part 52 is located on the side of the first cam 51 facing the transfer wheel 31 and extends towards the transfer wheel 31. The transition portion between the first cam 51 and the first pushing part 52 is a slope, which facilitates the smooth movement of the push rod 4 from the first cam 51 to the first pushing part 52, while preventing the push rod 4 from getting stuck when squeezed by the first pushing part 52. The distance between the first cam 51 and the transfer wheel 31 is the same as the length of the push rod 4.

[0073] like Figure 4As shown, this embodiment also includes a plurality of second grooves 331, which are equidistantly formed on the side of the slider 33 facing the external environment. The spacing between any two second grooves 331 is the same as the spacing between any two first grooves 34. The length of the first channel 32 is greater than the length of the slider 33, and the length difference between the first channel 32 and the slider 33 is the same as the extension distance of the first pushing part 52. When the first channel 32 is flush with the side of the slider 33 near the push rod 4, the push rod 4 extends fully out of the first channel 32. The groove width of both the first groove 34 and the second groove 331 is greater than the radial width of the small part 1.

[0074] That is, when the slider 33 rotates with the transfer wheel 31 to below the transfer wheel 31, the push rod 4 that reaches the first cam 51 will move along the side of the first cam 51 toward the transfer wheel 31. When the push rod 4 moves to the first pushing part 52, the push rod 4 is squeezed by the first pushing part 52 toward the transfer wheel 31, so the push rod 4 moves axially toward the transfer wheel 31, thus driving the slider 33 to move away from the push rod 4 in the first channel 32 until the limit position.

[0075] In this embodiment, the initial position of the push rod 4 is: the push rod 4 fully extends out of the transfer wheel 31; the extreme position of the push rod 4 in this embodiment is: the push rod 4 is partially located within the first channel 32, and the end of the slider 33 away from the push rod 4 contacts the end of the first channel 32 away from the push rod 4. As the push rod 4 moves along the first pushing part 52 toward the transfer wheel 31, several second grooves 331 on the slider 33 connected to the push rod 4 gradually connect with several first grooves 34 adjacent to the slider 33 and located above the weighing platform 61. Only when the small part 1 in the first groove 34 moves along the guide seat 35 to the positioning groove 611 on the upper part of the weighing platform 61 will the second groove 331 on the slider 33 be fully connected with the adjacent first groove 34 that has moved above the weighing platform 61.

[0076] like Figure 3 As shown, the direction is related to the attached Figure 1When the small part 1 is on the weighing platform 61: the several second grooves 331 on the left and right sides of the small part 1 are completely connected to the several first grooves 34 above the small part 1. As the transfer wheel 31 rotates, the connected second grooves 331 and first grooves 34 can completely avoid touching the small part 1 on the weighing platform 61. The stop channel 36 on the first channel 32 on the left side of the small part 1 will push the small part 1 on the weighing platform 61 to the discharge channel 9 as the transfer wheel 31 rotates. At the same time, the roller 74 drives the stop 76 to be flush with the outlet of the positioning groove 611, preventing the small part 1 from sliding into the positioning groove 611 and falling. As the transfer wheel 31 rotates, the stop 76 on the connecting rod follow mechanism will swing up and down. The stop channel 36 not only reserves space for the stop 76 to swing but also pushes the small part 1 into the discharge channel 9.

[0077] This implementation plan also includes a weighing method for a continuous weighing system for small products, the specific steps of which are as follows:

[0078] Step 1, unloading small parts: The unloading mechanism 2 conveys several small parts 1 in a single longitudinal column to the first groove 34 in the transfer wheel 31;

[0079] Step 2, conveying of small parts: the conveying and transfer mechanism 3 conveys several small parts 1 one by one to the weighing mechanism 6;

[0080] Step 2-1: As the transfer wheel 31 rotates, the push rod 4 that reaches the first cam 51 will move along the first cam 51 toward the transfer wheel 31.

[0081] Step 2-2: As the transfer wheel 31 rotates, the push rod 4, which reaches the first push part 52, gradually moves to its limit position;

[0082] During the period from the beginning of step 2-1 to the end of step 2-2, the second groove 331 on the slider 33 that reaches the first pushing part 52 gradually connects with the first groove 34.

[0083] Steps 2-3: When the second groove 331 and the first groove 34 are fully connected, the small part 1 reaches the positioning groove 611 on the weighing platform 61, and at the same time, the stop bar 76 is aligned with the outlet direction of the weighing platform 61.

[0084] Step 3: Weighing of small items: Weighing mechanism 6 weighs small item 1;

[0085] Step 4: As the transfer wheel 31 rotates, the stop bar 76, which is aligned with the outlet direction of the weighing platform 61, is lifted; the side wall of the first channel 32 located above the weighing platform 61 pushes the small part 1 located on the positioning groove 611 into the discharge channel 9.

[0086] Step 5, continuous weighing: Repeat steps 1 to 4 in a loop.

[0087] Example 2

[0088] This embodiment provides a preferred implementation scheme, based on the above structure, such as Figures 6 to 8 As shown, in this embodiment, on the end face of the transfer wheel 31 on the same side as the push rod 4, a plurality of slide tracks 8 are formed along the circumference of the end face, facing the center of the end face; a plurality of sliders 33 reciprocate radially along the slide tracks 8 within the first channel 32. The reset mechanism can adopt any mechanical structure capable of resetting the push rod 4 from its extreme position to its initial position. Preferably, the reset mechanism can adopt an elastic element, which is disposed at the bottom of the first channel 32 and contacts the sliders 33 within the first channel 32, thereby resetting the push rod 4 from its extreme position to its initial position through the elasticity of the elastic element. Figure 8 As shown, the second cam 53 has a semi-circular arc shape, with its opening facing upwards. A second pushing part 54 is provided on the opening surface of the second cam 53, and the second pushing part 54 has a wavy structure. The height of the protruding part of the second pushing part 54 is the same as the length of the slide rail 8.

[0089] In this embodiment, the initial position of the push rod 4 is: the side of the slider 33 facing the external environment is connected to the circumferential surface of the transfer wheel 31; the extreme position of the push rod 4 in this embodiment is: the push rod 4 slides to the top of the protruding part of the second push part 54, causing the slider 33 connected to this push rod 4 to be lifted upward, and at the same time, the first channel 32 where this slider 33 is located is connected to the first groove 34 located above the weighing platform 61 adjacent to this slider 33.

[0090] That is, when the slider 33 rotates with the transfer wheel 31 to below the transfer wheel 31, the push rod 4, which reaches the second cam 53, is mounted on the opening surface of the second cam 53. When the push rod 4 moves to the protruding part of the second pushing part 54, the push rod 4 is subjected to the upward squeezing force of the second pushing part 54, so the push rod 4 moves upward, thus driving the slider 33 to move radially along the slide 8 towards the center of the transfer wheel 31 in the first channel 32 until it reaches the limit position. At this time, the first channel 32 where the slider 33 is located is connected to the first groove 34 located above the weighing platform 61 adjacent to the slider 33.

[0091] like Figure 6 As shown, the direction is related to the attached Figure 1As a result, the small part 1 is conveyed from the first groove 34 to the positioning groove 611 on the weighing platform 61. When in the weighing state: the sliders 33 in the two first channels 32 below the transfer wheel 31 are in their extreme positions, and the first groove 34 directly above the weighing platform 61 is connected to the first channel 32 on its left; at the same time, the roller 74 drives the stop bar 76 to be flush with the outlet of the positioning groove 611, preventing the small part 1 from slipping off the positioning groove 611. The transfer wheel 31 continues to rotate, and the slider 33 on the left side of the first groove 34 directly above the weighing platform 61 passes over the small part 1 on the positioning groove 611. At this time, the small part 1 is stationary on the weighing platform 61 and is weighed. After the small part 1 is weighed, the roller 74 drives the stop bar 76 to lift up and expose the outlet of the positioning groove 611. Then the stop bar channel 36 on the left side of the first channel 32 of the small part 1 on the weighing platform 61 pushes the small part 1 off the weighing platform 61 and sends it into the discharge channel 9.

[0092] This implementation plan also includes a weighing method for a continuous weighing system for small products, the specific steps of which are as follows:

[0093] Step 1, unloading small parts: The unloading mechanism 2 conveys several small parts 1 in a single longitudinal column to the first groove 34 in the transfer wheel 31;

[0094] Step 2, conveying of small parts: the conveying and transfer mechanism 3 conveys several small parts 1 one by one to the weighing mechanism 6;

[0095] Step 2-1: As the transfer wheel 31 rotates, the push rod 4 that reaches the second cam 53 will move upward along the opening direction of the second cam 53;

[0096] Step 2-2: As the transfer wheel 31 rotates, the push rod 4 that reaches the protruding part of the second push section 54 gradually moves to the limit position;

[0097] During the period from the beginning of step 2-1 to the end of step 2-2, the first channel 32 gradually connects with the first groove 34;

[0098] Steps 2-3: When the first channel 32 and the first groove 34 are fully connected, the small part 1 reaches the positioning groove 611 on the weighing platform 61, and at the same time, the stop bar 76 is aligned with the outlet direction of the weighing platform 61.

[0099] Step 3: Weighing of small items: Weighing mechanism 6 weighs small item 1;

[0100] Step 4: As the transfer wheel 31 rotates, the stop bar 76, which is aligned with the outlet direction of the weighing platform 61, is lifted; the side wall of the first channel 32 located above the weighing platform 61 pushes the small part 1 located on the positioning groove 611 into the discharge channel 9.

[0101] Step 5, continuous weighing: Repeat steps 1 to 4 in a loop.

[0102] This implementation scheme adopts a continuous conveying and transfer method, which shortens the time for small products 1 to be placed on and off the weighing platform 61. While ensuring the same weighing time, it shortens the weighing cycle of each small product 1, greatly speeds up the weighing speed of small products 1, and achieves high-speed weighing.

[0103] Those skilled in the art will understand that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as herein.

[0104] The meaning of "and / or" as used in this application includes situations where each exists alone or both exist simultaneously.

[0105] The term "connection" as used in this application can mean a direct connection between components or an indirect connection between components through other components.

[0106] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A continuous weighing system for small products, comprising a support frame, characterized in that: It includes a feeding mechanism (2), a conveying and transferring mechanism (3), several push rods (4), a pushing mechanism (5), several resetting mechanisms, a weighing mechanism (6), a discharge channel (9), and a linkage following mechanism, wherein: The feeding mechanism (2) is located on the top of the support and is used to transport a number of small parts (1) in a single longitudinal column to the conveying and transfer mechanism (3). The conveying and transfer mechanism (3) is located below the feeding mechanism (2), and the conveying and transfer mechanism (3) is used to convey several small products (1) one by one to the weighing mechanism (6); The conveying and transfer mechanism (3) includes a transfer wheel (31), a plurality of first channels (32), a plurality of sliders (33), a plurality of first grooves (34), and a guide seat (35). The transfer wheel (31) is disposed below the feeding mechanism (2). A plurality of first channels (32) are equidistantly axially opened on the outer circumferential surface of the transfer wheel (31), and the sliders (33) are disposed in the first channels (32). A plurality of first grooves (34) are equidistantly axially opened on the outer circumferential surface of the transfer wheel (31) between each pair of first channels (32). The guide seat (35) is adjacent to part of the outer circumferential surface of the transfer wheel (31). The push rod (4) is disposed on one end of the slider (33) along the axial direction of the slider (33); The pushing mechanism (5) is located on one side of the transfer wheel (31), and the pushing mechanism (5) and the push rod (4) are located on the same side of the transfer wheel (31). The pushing mechanism (5) is used to push the slider (33) connected to the push rod (4) to slide along the first channel (32) away from the pushing mechanism (5). The reset mechanism is used to push the slider (33) connected to the push rod (4) to slide along the first channel (32) toward the initial position; The weighing mechanism (6) is located below the transfer wheel (31) and fixed on the bracket. The weighing mechanism (6) is used to weigh each of the small products (1) piece by piece. The discharge channel (9) is located below the weighing mechanism (6) on the side away from the guide seat (35), and the discharge channel (9) is used for the discharge of the weighed small product (1); The linkage following mechanism is located above the discharge channel (9). The linkage following mechanism is used to prevent the small product (1) from sliding off the weighing mechanism (6) into the external environment due to inertia.

2. The continuous weighing system for small products according to claim 1, characterized in that: The first groove (34) includes a limiting part (341), a first inclined surface (342), a second inclined surface (343), and a channel section (344). The bottom of the first groove (34) along the rotation direction of the transfer wheel (31) consists of the channel section (344), the first inclined surface (342), the limiting part (341), and the second inclined surface (343). The intersection of the first inclined surface (342) and the second inclined surface (343) is recessed in the direction of the middle of the transfer wheel (31) to form the limiting part (341). The first inclined surface (342), the limiting part (341), and the second inclined surface (343) have a V-shaped structure. The bottom surface of the channel section (344) is concentric and equidistant from the outer circle of the transfer wheel (31).

3. A continuous weighing system for small products according to claim 2, characterized in that: The linkage following mechanism includes a cam structure (71), a swing shaft (72), a fixed frame (73), a roller (74), a swing arm (75), and several stop levers (76). The cam structure (71) is arranged in a circle around the outer circumference of the transfer wheel (31) to form a circular structure. The swing shaft (72) is axially arranged above the discharge channel (9) along the transfer wheel (31). The fixed frame (73) is arranged on both sides of the discharge channel (9) and connected to both ends of the swing shaft (72). The swing arm (75) is arranged above the swing shaft (72). The roller (74) is arranged on the top of the swing arm (75) and is tangent to the circular structure formed by the cam structure (71). Several stop levers (76) are equidistantly distributed on the side of the swing shaft (72) facing the transfer wheel (31), and each stop lever (76) is aligned with the outlet direction of one of the weighing mechanisms (6).

4. A continuous weighing system for small products according to claim 3, characterized in that: Several of the sliders (33) slide axially back and forth within the first channel (32).

5. A continuous weighing system for small products according to claim 3, characterized in that: Several of the sliders (33) slide radially back and forth within the first channel (32).

6. A continuous weighing system for small products according to claim 4, characterized in that: It also includes a number of second grooves (331), which are equidistantly formed on the side of the slider (33) facing the external environment; the spacing between any two second grooves (331) is the same as the spacing between any two first grooves (34).

7. A continuous weighing system for small products according to claim 6, characterized in that: The pushing mechanism (5) includes a first cam (51) and a first pushing part (52), wherein the first cam (51) extends toward the transfer wheel (31) on one side to form the first pushing part (52).

8. A continuous weighing system for small products according to claim 5, characterized in that: The pushing mechanism (5) includes a second cam (53) and a second pushing part (54), wherein the second cam (53) has an upward protrusion on its top surface to form the second pushing part (54).

9. A weighing method based on the continuous weighing system for small products as described in claim 7, characterized in that, Includes the following steps: Step 1, unloading of small parts: The unloading mechanism (2) transports several small parts (1) in a single longitudinal column into the first groove (34) in the transfer wheel (31); Step 2, conveying of small parts: The conveying and transfer mechanism (3) conveys several small parts (1) one by one to the weighing mechanism (6); Step 2-1: As the transfer wheel (31) rotates, the push rod (4) that reaches the first cam (51) will move along the first cam (51) toward the transfer wheel (31); Step 2-2: As the transfer wheel (31) rotates, the push rod (4) that reaches the first push part (52) gradually moves to the limit position; During the period from the beginning of step 2-1 to the end of step 2-2, the second groove (331) on the slider (33) gradually connects with the first groove (34); Steps 2-3: When the second groove (331) is fully connected to the first groove (34), the small part (1) reaches the weighing mechanism (6), and at the same time the stop bar (76) is aligned with the outlet direction of the weighing mechanism (6); Step 3, Weighing of small products: The weighing mechanism (6) weighs the small products (1); Step 4: As the transfer wheel (31) rotates, the stop bar (76), which is aligned with the outlet direction of the weighing mechanism (6), is raised; The side wall of the first channel (32) located above the weighing mechanism (6) pushes the small part (1) located on the weighing mechanism (6) into the discharge channel (9); Step 5, continuous weighing: Repeat steps 1 to 4 in a loop.

10. A weighing method based on the continuous weighing system for small products as described in claim 8, characterized in that, Includes the following steps: Step 1, unloading of small parts: The unloading mechanism (2) transports several small parts (1) in a single longitudinal column into the first groove (34) in the transfer wheel (31); Step 2, conveying of small parts: The conveying and transfer mechanism (3) conveys several small parts (1) one by one to the weighing mechanism (6); Step 2-1: As the transfer wheel (31) rotates, the push rod (4) that reaches the second cam (53) will move upward along the opening direction of the second cam (53); Step 2-2: As the transfer wheel (31) rotates, the push rod (4) that reaches the protruding part of the second push part (54) gradually moves to the limit position; During the period from the beginning of step 2-1 to the end of step 2-2, the first channel (32) gradually connects with the first groove (34); Steps 2-3: When the first channel (32) and the first groove (34) are fully connected, the small part (1) reaches the weighing mechanism (6), and at the same time, the stop bar (76) is aligned with the outlet direction of the weighing mechanism (6); Step 3, Weighing of small products: The weighing mechanism (6) weighs the small products (1); Step 4: As the transfer wheel (31) rotates, the stop bar (76), which is aligned with the outlet direction of the weighing mechanism (6), is raised; The side wall of the first channel (32) located above the weighing mechanism (6) pushes the small part (1) located on the weighing mechanism (6) into the discharge channel (9); Step 5, continuous weighing: Repeat steps 1 to 4 in a loop.

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