Current-limiting weighing device
By adjusting the cross-sectional area of the feeding track through a flow-limiting mechanism, the accuracy and timing issues of linear weighing devices when materials approach the target weight are resolved, achieving efficient and accurate weighing results.
Patent Information
- Application Number
- CN202422930315.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-28
- Publication Date
- 2025-11-04
- Estimated Expiration
- 2034-11-28
AI Technical Summary
Existing linear weighing devices struggle to accurately weigh materials when they approach the target weight, resulting in poor weighing accuracy and extended weighing time, which impacts production efficiency.
A flow-limiting mechanism is adopted, which controls the change of cross-sectional area of the feeding track through baffles and drivers to adjust the material flow rate, and achieves accurate weighing by combining with the weighing module detection.
It improves weighing accuracy, shortens weighing time, and ensures production continuity and efficiency.
Smart Images
Figure CN223508590U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of packaging production technology, and in particular to a flow-limiting weighing device. Background Technology
[0002] Linear weighing typically involves feeding and weighing simultaneously, with continuous feeding until the target weight is reached. A linear vibrator below the feeding track drives the material towards the weighing hopper. When the weighing hopper detects a slight difference between the material's weight and the target weight, it controls the linear vibrator's operating time for a set duration to bring the material's weight closer to the target. This weighing method struggles to achieve highly accurate target weight values. In related technologies, to maximize weighing accuracy, the vibration frequency of the linear vibrator is reduced and the set duration is extended when the material's weight deviates slightly from the target weight. However, this method only slightly improves measurement accuracy and significantly increases weighing time, reducing production efficiency. Utility Model Content
[0003] In order to overcome the shortcomings of the prior art, one of the objectives of this utility model is to provide a current-limiting weighing device that can be used as a linear scale to shorten the weighing time and improve the weighing accuracy.
[0004] A flow-limiting weighing device according to an embodiment of the present invention includes: a frame, on which a feeding track is provided, and at the bottom of the feeding track is a linear vibrator for driving material to move along its length direction; a feeding bin, located above one end of the feeding track, for inputting material toward the feeding track; a receiving bin, located below the other end of the feeding track, and connected to a weighing module; and a flow-limiting mechanism, movably mounted on the frame, capable of reducing the cross-sectional area of the feeding track along its conveying direction.
[0005] The current-limiting weighing device according to the embodiments of this utility model has at least the following beneficial effects:
[0006] The receiving hopper feeds material into the feeding track. The linear vibrator drives the material on the feeding track to fall into the receiving hopper. When the weighing module detects that the material in the receiving hopper is close to the target weight, the flow limiting mechanism works to reduce the cross-sectional area of the feeding track along its conveying direction, thereby making the flow rate suddenly become a smaller value. The linear vibrator continues to vibrate until the weighing module detects that the material has reached the target weight and then stops. The flow limiting weighing device with the above structure can be used as a linear scale to avoid the problem of poor weighing accuracy caused by the inability of the flow rate of the conveyed material to change in time, and can also shorten the weighing time.
[0007] In some embodiments of this utility model, the flow limiting mechanism includes a baffle and a driver that drives the baffle to abut against the port of the feeding track near the receiving bin. A flow limiting port is formed on the baffle, and the diameter of the flow limiting port is smaller than that of the port of the feeding track.
[0008] In some embodiments of this utility model, the frame is provided with a mounting bracket above the feeding track, the upper end of the baffle is connected to a cantilever plate extending toward the mounting bracket, the end of the cantilever plate away from the baffle is rotatably connected to the mounting bracket via a horizontal pivot, the driver is a cylinder, the cylinder body is rotatably connected to the mounting bracket, and the output rod of the cylinder is rotatably connected to the cantilever plate.
[0009] In some embodiments of this utility model, the baffle is provided with an adjustment mechanism that can adjust the size of the flow-limiting port.
[0010] In some embodiments of this utility model, the baffle is provided with a slot that is recessed upward along its lower edge and downward. The adjustment mechanism includes a lifting plate that is raised and lowered on the baffle. The lifting plate can partially or completely cover the slot. The flow restriction port is defined between the lifting plate, the slot and the feeding track. The lifting plate is provided with a waist-shaped hole on each side of the slot, which extends along the height direction of the slot. Fastening bolts are passed through the waist-shaped holes and tightened on the baffle.
[0011] In some embodiments of this utility model, the feeding bin is a frustum-shaped hopper that is larger at the top and smaller at the bottom. Multiple feeding tracks are evenly distributed circumferentially around the central axis of the frustum-shaped hopper. Each feeding track is equipped with a receiving bin and a flow limiting mechanism. The end of each feeding track away from the corresponding receiving bin is connected by a conical guide plate. The tip of the conical guide plate extends upward into the interior of the frustum-shaped hopper. The frame is provided with a discharge hopper located below the receiving bin and receiving all the receiving bins.
[0012] In some embodiments of this utility model, the mounting bracket is an annular ring arranged concentrically with the frustum-shaped hopper, and the mounting bracket has multiple columns distributed circumferentially around its center, with each column corresponding to a cylinder.
[0013] In some embodiments of this utility model, the number of receiving bins is 2N, where N is a positive integer greater than 2. The lower end of the discharge hopper is provided with a partition, which divides the channel at the lower end of the discharge hopper into a first discharge pipe and a second discharge pipe. The first discharge pipe connects to N sequentially arranged receiving bins, and the second discharge pipe connects to the remaining N sequentially arranged receiving bins. The first discharge pipe and the second discharge pipe are respectively connected to the first discharge bin and the second discharge bin. Both the first discharge bin and the second discharge bin are provided with a first switch mechanism to control their opening and closing.
[0014] In some embodiments of this utility model, each receiving bin is provided with a second switch mechanism to control its opening and closing. All second switch mechanisms and the weighing module are electrically connected to the control module. The control module is used to record the values detected by the weighing module corresponding to each receiving bin, and calculate the sum between any values to compare with the target weight, thereby controlling the corresponding second switch mechanism and the first switch mechanism to open.
[0015] In some embodiments of this utility model, the outer periphery of the conical guide plate extends along its generatrix to form part of the bottom wall of the feeding track. The bottom wall of the feeding track is provided with an i-shaped frame to form a feeding channel with a rectangular cross-section. One end of the i-shaped frame is welded to the lower end of the frustum-shaped hopper, and the other end of the i-shaped frame is provided with a flow-stopping plate that is raised and lowered. The flow-stopping plate has a vertically extending elongated hole, and a threaded fastener passes through the elongated hole and is connected to the i-shaped frame to adjust the size of the feeding channel.
[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0018] Figure 1 This is a schematic diagram of the structure of one embodiment of the current-limiting weighing device of this utility model;
[0019] Figure 2 yes Figure 1 A cross-sectional schematic diagram of an embodiment;
[0020] Figure 3 yes Figure 1 A schematic diagram of the structure combining a receiving bin, a limiting mechanism, and a feeding bin in one embodiment.
[0021] Figure label:
[0022] Frame 100; Mounting bracket 110; Column 120; Feeding track 200; C-shaped frame 210; Cut-off plate 220; Long slot 230; Threaded fastener 240; Feeding bin 300; Receiving bin 400; Second switching mechanism 410; Flow limiting mechanism 500; Baffle 510; Overhang plate 511; Driver 520; Flow limiting port 530; Horizontal pivot 540; Lifting plate 610; Waist-shaped hole 620; Fastening bolt 630; Conical guide plate 700; Discharge hopper 800; Partition 810; First discharge pipe 820; Second discharge pipe 830; First discharge bin 840; Second discharge bin 850; First switching mechanism 860. Detailed Implementation
[0023] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.
[0024] In the description of this utility model, it should be understood that the directional descriptions, such as the terms "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0025] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.
[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0027] Reference Figures 1 to 3This utility model discloses a flow-limiting weighing device, comprising: a frame 100, on which a feeding track 200 is provided, and at the bottom of the feeding track 200 is a linear vibrator that drives the material to move along its length direction; a feeding bin 300, located above one end of the feeding track 200, for inputting material toward the feeding track 200; a receiving bin 400, located below the other end of the feeding track 200, and connected to a weighing module; and a flow-limiting mechanism 500, movably mounted on the frame 100, capable of reducing the cross-sectional area of the feeding track 200 along its conveying direction.
[0028] When the above flow-limiting weighing device is working, the receiving bin 400 feeds the material into the feeding track 200. The linear vibrator drives the material on the feeding track 200 to fall into the receiving bin 400. When the weighing module detects that the material in the receiving bin 400 is close to the target weight, the flow-limiting mechanism 500 works to reduce the cross-sectional area of the feeding track 200 along its conveying direction, thereby making the flow rate suddenly become a smaller value. The linear vibrator continues to vibrate until the weighing module detects that the material has reached the target weight and then stops. The flow-limiting weighing device with the above structure can be used as a linear weighing device to avoid the problem of poor weighing accuracy caused by the inability of the flow rate of the conveyed material to change in time, and can also shorten the weighing time.
[0029] See Figure 2 and Figure 3 In some embodiments of this utility model, the flow limiting mechanism 500 includes a baffle 510 and a driver 520 that drives the baffle 510 to abut against the port of the feeding track 200 near the receiving bin 400. A flow limiting port 530 is provided on the baffle 510, and the diameter of the flow limiting port 530 is smaller than that of the port of the feeding track 200. It is understood that when the weighing module detects that the material in the receiving bin 400 is close to the target weight, for example, reaching 90% of the target weight, the driver 520 drives the baffle 510 to abut against the port of the feeding track 200 near the receiving bin 400. At this time, the material can only move from the flow limiting port 530 towards the receiving bin 400, achieving the purpose of drastically reducing the output flow of the material, without needing to adjust the vibration frequency of the linear vibrator.
[0030] See Figure 1 and Figure 3In some embodiments of this utility model, the frame 100 is provided with a mounting bracket 110 above the feeding track 200. The upper end of the baffle 510 is connected to a cantilever plate 511 extending toward the mounting bracket 110. One end of the cantilever plate 511 away from the baffle 510 is rotatably connected to the mounting bracket 110 via a horizontal pivot 540. The driver 520 is a cylinder, the cylinder body of which is rotatably connected to the mounting bracket 110, and the output rod of which is rotatably connected to the cantilever plate 511. It can be understood that when the cylinder output rod extends, the cantilever plate 511 swings downward to drive the baffle 510 to cover the port of the feeding track 200 near the receiving bin 400; when the cylinder output rod retracts, the cantilever plate 511 swings upward to drive the baffle 510 to open the port of the feeding track 200 near the receiving bin 400. The flow limiting mechanism 500 with the above structure is very simple, low in cost, and has a fast response speed. Of course, in other embodiments, the flow limiting mechanism 500 can also be replaced by moving the baffle 510 directly close to or away from the bottom wall of the feeding track 200, thereby directly adjusting the flow rate of the material.
[0031] It should be noted that the size of the flow limiting port 530 is set according to actual needs. An excessively large flow limiting port 530 will not have an obvious effect, while an excessively small flow limiting port 530 will greatly prolong the weighing time. In some embodiments of this utility model, the baffle 510 is provided with an adjustment mechanism that can adjust the size of the flow limiting port 530. Users can achieve a relative balance between weighing time and weighing accuracy through testing.
[0032] See Figure 3 In some embodiments of this utility model, the baffle 510 is provided with a slot (not shown in the figure) that is recessed upwards along its lower edge and downwards. The adjustment mechanism includes a lifting plate 610 that is raised and lowered on the baffle 510. The lifting plate 610 can partially or completely cover the slot. The lifting plate 610, the slot, and the feeding track 200 define the flow-limiting port 530. The lifting plate 610 has a waist-shaped hole 620 extending along the height direction of the slot on both sides of the slot. The fastening bolt 630 passes through the waist-shaped hole 620 and is tightened onto the baffle 510. It can be understood that when the fastening bolt 630 is loosened, the user can raise or lower the baffle 510, and the fastening bolt 630 can move up and down along the waist-shaped hole 620 to adjust the height and size of the flow-limiting port 530. Then, the fastening bolt 630 can be tightened again, which is very convenient to use.
[0033] See Figure 2 and Figure 3In some embodiments of this utility model, the feeding bin 300 is a frustum-shaped hopper that is larger at the top and smaller at the bottom. Multiple feeding tracks 200 are evenly distributed circumferentially around the central axis of the frustum-shaped hopper. Each feeding track 200 is equipped with a receiving bin 400 and a flow limiting mechanism 500. The end of each feeding track 200 away from the corresponding receiving bin 400 is connected by a conical guide plate 700. The tip of the conical guide plate 700 extends upward into the interior of the frustum-shaped hopper. The frame 100 is provided with a discharge hopper 800 located below the receiving bin 400 and receiving all the receiving bins 400. It should be noted that the weighing process and the packaging process are often closely linked. It takes a certain amount of time for the material in the receiving bin 400 to reach the target weight. Setting up multiple feeding tracks 200, multiple receiving bins 400 and multiple flow limiting mechanisms 500 can prevent the packaging process from being in a waiting state. While some receiving bins 400 are receiving materials, the material in at least one receiving bin 400 has already reached the target weight, thereby meeting the needs of continuous production. Moreover, the entire limiting weighing device shares a single feeding bin 300, which helps to simplify the structure.
[0034] See Figure 1 and Figure 3 In some embodiments of this utility model, in order to further simplify the installation structure of each flow limiting mechanism 500, the mounting bracket 110 is a ring arranged concentrically with the frustum-shaped hopper, and the mounting bracket 110 has a plurality of columns 120 distributed circumferentially around its center, and each column 120 is correspondingly installed with a cylinder.
[0035] See Figure 1 and Figure 2 In some embodiments of this utility model, the number of receiving bins 400 is 2N, where N is a positive integer greater than 2. A partition 810 is provided at the lower end of the discharge hopper 800, dividing the channel at the lower end of the discharge hopper 800 into a first discharge pipe 820 and a second discharge pipe 830. The first discharge pipe 820 connects to N sequentially arranged receiving bins 400, and the second discharge pipe 830 connects to the remaining N sequentially arranged receiving bins 400. The first discharge pipe 820 and the second discharge pipe 830 are respectively connected to a first discharge bin 840 and a second discharge bin 850. Both the first discharge bin 840 and the second discharge bin 850 are provided with a first switch mechanism 860 for controlling their opening and closing. It can be understood that when the time it takes for the material in a single receiving bin 400 to reach the target weight is short, dividing the 2N receiving bins 400 into two groups can avoid a large number of receiving bins 400 being in a waiting state, further improving production efficiency.
[0036] In some embodiments of this utility model, each receiving bin 400 is provided with a second switch mechanism 410 for controlling its opening and closing. All second switch mechanisms 410 and the weighing module are electrically connected to a control module. The control module is used to record the values detected by the weighing module corresponding to each receiving bin 400, and calculate the sum of any values to compare with the target weight, thereby controlling the corresponding second switch mechanism 410 and the first switch mechanism 860 to open. It can be understood that the current-limiting weighing device with the above structure can also be used as a general combination weighing device, expanding its application. That is, by recording the weight of the material in all receiving bins 400, the material in two, three, or four receiving bins 400 can be combined according to the target weight value. When the sum of the material in several receiving bins 400 is close to the target weight, the corresponding second switch mechanism 410 is opened, and these materials can be gathered together and the corresponding first switch mechanism 860 is opened to transport them to the next process.
[0037] See Figure 2 and Figure 3 In some embodiments of this utility model, in order to allow materials to smoothly enter each feeding track 200, the outer periphery of the conical guide plate 700 extends along its generatrix to form part of the bottom wall of the feeding track 200. The bottom wall of the feeding track 200 is provided with a U-shaped frame 210 to form a feeding track 200 with a rectangular cross-section. One end of the U-shaped frame 210 is welded to the lower end of the frustum-shaped hopper. In order to adjust the flow rate of the material input to the feeding track 200, a flow interceptor 220 is provided at the other end of the U-shaped frame 210. The flow interceptor 220 has a vertically extending elongated hole 230. A threaded fastener 240 passes through the elongated hole 230 and is connected to the U-shaped frame 210 to adjust the size of the feeding channel.
[0038] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0039] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.
Claims
1. A current-limiting weighing device, characterized in that, include: A frame (100) is provided with a feeding track (200), and a linear vibrator is provided at the bottom of the feeding track (200) to drive the material to move along its length. A feeding bin (300) is located above one end of the feeding track (200) and is used to input materials toward the feeding track (200); A receiving bin (400) is located below the other end of the feeding track (200), and a weighing module is connected to the receiving bin (400); A flow-limiting mechanism (500), movably mounted on the frame (100), is capable of reducing the cross-sectional area of the feeding track (200) along its conveying direction.
2. The current-limiting weighing device according to claim 1, characterized in that: The flow limiting mechanism (500) includes a baffle (510) and a driver (520) that drives the baffle (510) to abut against the feed rail (200) near the port of the receiving bin (400). A flow limiting port (530) is provided on the baffle (510), and the diameter of the flow limiting port (530) is smaller than the port of the feed rail (200).
3. The current-limiting weighing device according to claim 2, characterized in that: The frame (100) is provided with a mounting bracket (110) above the feeding track (200). The upper end of the baffle (510) is connected to a cantilever plate (511) extending toward the mounting bracket (110). The end of the cantilever plate (511) away from the baffle (510) is rotatably connected to the mounting bracket (110) via a horizontal pivot (540). The driver (520) is a cylinder. The cylinder body is rotatably connected to the mounting bracket (110), and the output rod of the cylinder is rotatably connected to the cantilever plate (511).
4. A current-limiting weighing device according to claim 2, characterized in that: The baffle (510) is provided with an adjustment mechanism that can adjust the size of the flow restriction port (530).
5. A current-limiting weighing device according to claim 4, characterized in that: The baffle (510) is provided with a slot that is recessed upward along its lower edge and downward. The adjustment mechanism includes a lifting plate (610) that is raised and lowered on the baffle (510). The lifting plate (610) can partially or completely cover the slot. The lifting plate (610), the slot and the feeding track (200) define the flow restriction port (530). The lifting plate (610) is provided with a waist-shaped hole (620) on each side of the slot, which extends along the height direction of the slot. The fastening bolt (630) passes through the waist-shaped hole (620) and is tightened on the baffle (510).
6. A current-limiting weighing device according to claim 3, characterized in that: The feeding bin (300) is a frustum-shaped hopper that is larger at the top and smaller at the bottom. Multiple feeding tracks (200) are evenly distributed around the central axis of the frustum-shaped hopper. Each feeding track (200) is equipped with a receiving bin (400) and a flow limiting mechanism (500). The end of each feeding track (200) away from the corresponding receiving bin (400) is connected by a conical guide plate (700). The tip of the conical guide plate (700) extends upward into the interior of the frustum-shaped hopper. The frame (100) is provided with a discharge hopper (800) located below the receiving bins (400) and receiving all the receiving bins (400).
7. A current-limiting weighing device according to claim 6, characterized in that: The mounting bracket (110) is a ring-shaped structure concentric with the frustum-shaped hopper. The mounting bracket (110) has multiple columns (120) distributed circumferentially around its center, and each column (120) is equipped with a corresponding cylinder.
8. A current-limiting weighing device according to claim 6, characterized in that: The number of receiving bins (400) is 2N, where N is a positive integer greater than 2. The lower end of the discharge hopper (800) is provided with a partition (810). The partition (810) divides the channel at the lower end of the discharge hopper (800) into a first discharge pipe (820) and a second discharge pipe (830). The first discharge pipe (820) connects to N sequentially arranged receiving bins (400), and the second discharge pipe (830) connects to the remaining N sequentially arranged receiving bins (400). The first discharge pipe (820) and the second discharge pipe (830) are respectively connected to a first discharge bin (840) and a second discharge bin (850). Both the first discharge bin (840) and the second discharge bin (850) are provided with a first switch mechanism (860) to control their opening and closing.
9. A current-limiting weighing device according to claim 8, characterized in that: Each receiving bin (400) is provided with a second switch mechanism (410) for controlling its opening and closing. All the second switch mechanisms (410) and the weighing module are electrically connected to the control module. The control module is used to record the values detected by the weighing module corresponding to each receiving bin (400), and calculate the sum between any values to compare with the target weight, thereby controlling the corresponding second switch mechanism (410) and the first switch mechanism (860) to open.
10. A current-limiting weighing device according to claim 6, characterized in that: The outer periphery of the conical guide plate (700) extends along its generatrix to form part of the bottom wall of the feeding track (200). The bottom wall of the feeding track (200) is provided with a U-shaped frame (210) to form a feeding channel with a rectangular cross-section. One end of the U-shaped frame (210) is welded to the lower end of the frustum-shaped hopper. The other end of the U-shaped frame (210) is provided with a flow interceptor (220) that is raised and lowered. The flow interceptor (220) has a vertically extending elongated hole (230). A threaded fastener (240) passes through the elongated hole (230) and is connected to the U-shaped frame (210) to adjust the size of the feeding channel.