Powder feeding error control method and powder pressing system

Abstract

The application relates to the technical field of powder pressing equipment, and discloses a powder feeding error control method and a powder pressing system, wherein the powder feeding error control method comprises the following steps: determining the average value of the actual feeding amount of a plurality of discharge ports, calculating the difference between the actual feeding amount of each discharge port and the average value as the single error of each discharge port, taking the sum of the single errors of any discharge port during multiple feedings as the cumulative error of the discharge port, and adjusting the opening degree of each discharge port according to the cumulative error of the discharge port when the maximum value in the cumulative errors of the plurality of discharge ports exceeds a permissible threshold value, so that the single weight difference between different products in one pressing cycle is small, and the consistency of the products is improved.

Description

Technical Field

[0001] This invention relates to the field of powder pressing equipment technology, and in particular to a powder feeding error control method and a powder pressing system. Background Technology

[0002] The working process of the powder pressing equipment is as follows: Powder enters the powder shoe from the powder source, and the powder in the powder shoe fills the pressing cavity of the pressing mold; then the powder shoe is removed from the opening of the pressing cavity, and the punch is controlled to descend to press the powder in the pressing cavity to form a blank with a certain strength and shape.

[0003] To improve production efficiency, existing technologies propose a one-to-many pressing scheme. Specifically, the pressing mold has multiple pressing cavities, each equipped with a powder shoe, simultaneously pressing the powder in multiple pressing cavities to produce multiple products within one pressing cycle. However, due to powder filling errors between different powder shoes, the individual weights of multiple products produced within the same pressing cycle may vary significantly, resulting in low individual weight stability and poor consistency.

[0004] Therefore, there is an urgent need for a method to control powder feeding errors in order to solve the above-mentioned technical problems. Summary of the Invention

[0005] The purpose of this invention is to propose a powder feeding error control method and a powder pressing system, which can reduce the weight difference between different products within the same pressing cycle.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] Each time material is fed, the actual feeding amount of each outlet of each powder shoe is obtained, the average value of the actual feeding amount of multiple outlets is determined, the difference between the actual feeding amount of each outlet and the average value is calculated, and the difference is used as the single error of each outlet.

[0008] The sum of the single errors of any of the discharge ports during multiple feedings is calculated as the cumulative error of the discharge port.

[0009] When the maximum value of the cumulative error among the multiple discharge ports exceeds the allowable threshold, the opening of the discharge port is adjusted according to the cumulative error of each discharge port.

[0010] As a preferred technical solution of the above-mentioned powder feeding error control method, when the maximum value of the cumulative error of multiple discharge ports exceeds the allowable threshold, the opening size of each discharge port is adjusted according to the cumulative error of each discharge port, including:

[0011] The opening adjustment amount of the i-th discharge port 1≤i≤N;

[0012] Wherein, N represents the total number of the plurality of discharge ports; W i,j R represents the cumulative error during the j-th feeding at the i-th discharge port; j represents the number of feedings when the maximum value of the cumulative error of the multiple discharge ports exceeds the allowable threshold; R represents the opening adjustment amount of the discharge port required for unit mass adjustment.

[0013] As a preferred technical solution of the above-mentioned powder feeding error control method, if the number of feedings reaches the allowable number of feedings within a feeding cycle, the opening of the discharge port is adjusted according to the cumulative error of each discharge port when the number of feedings reaches the allowable number of feedings.

[0014] As a preferred technical solution of the above-mentioned powder feeding error control method, the opening of the discharge port is adjusted according to the cumulative error of each discharge port when the number of feedings reaches the allowable number of feedings:

[0015] The opening adjustment amount of the i-th discharge port 1≤i≤N;

[0016] Wherein, N represents the total number of the plurality of discharge ports; W i,Q R represents the cumulative error during the Qth feeding at the i-th discharge port within a feeding cycle; Q represents the allowable number of feedings within a feeding cycle; and R represents the amount of discharge port opening adjustment required for unit mass adjustment.

[0017] As a preferred technical solution of the above-mentioned powder feeding error control method, the cumulative error and feeding count are reset to zero each time the opening of all the discharge ports is adjusted.

[0018] To achieve the above objectives, the present invention also provides a powder pressing system for executing the powder feeding error control method described in any of the above embodiments, the powder pressing system comprising:

[0019] A pressing mold, the pressing mold including a template, the upper surface of the template being provided with a plurality of pressing cavities;

[0020] Multiple powder boots, each of which includes a boot body with at least one discharge port on the bottom, a paddle corresponding to each discharge port, and a drive unit corresponding to each paddle. The multiple discharge ports correspond to multiple pressing chambers. Powder in the boot body can fall into the corresponding pressing chamber through the discharge port. The drive unit can drive the corresponding paddle to adjust the opening of the corresponding discharge port.

[0021] Multiple metering units, each corresponding to one of the pressing chambers, are used to measure the amount of powder falling into the corresponding pressing chamber.

[0022] As a preferred embodiment of the powder pressing system described above, the paddle is located below the discharge port, and the paddle is clearance-fitted with the opening end face of the discharge port.

[0023] As a preferred technical solution of the above-mentioned powder pressing system, the driving unit includes a linear drive and a slider. The movable end of the linear drive is connected to the paddle. The slider is slidably connected to one of the fixed end of the linear drive and the paddle in a first horizontal direction, and is fixedly connected to the other.

[0024] As a preferred technical solution of the above-mentioned powder pressing system, the powder shoe further includes a mounting frame, which includes a first mounting plate and a second mounting plate, and the first mounting plate and the second mounting plate are connected to form an L-shaped structure;

[0025] The first mounting plate is connected to the material shoe body, and the second mounting plate is connected to the fixed end of the linear drive component.

[0026] As a preferred technical solution of the above-mentioned powder pressing system, there are two first mounting plates, which are arranged at intervals along the second horizontal direction. The first horizontal direction is perpendicular to the second horizontal direction, and the paddle can pass through the gap between the two first mounting plates.

[0027] The beneficial effects of this invention are as follows: The powder feeding error control method and powder pressing system provided by this invention determine the average value of the actual feeding amount of multiple discharge ports, calculate the difference between the actual feeding amount of each discharge port and the average value, and use it as the single error of each discharge port. The sum of the single errors of any discharge port during multiple feedings is used as the cumulative error of that discharge port. When the maximum value of the cumulative error of multiple discharge ports exceeds the allowable threshold, the opening of the discharge port is adjusted according to the cumulative error of each discharge port, thereby reducing the single weight difference between different products within a pressing cycle and improving product consistency. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0029] Figure 1This is a schematic diagram of the structure of the powder shoe in a powder pressing system provided by an embodiment of the present invention;

[0030] Figure 2 This is an exploded view of the powder shoe in a powder pressing system provided in an embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of the structure of a paddle provided in an embodiment of the present invention;

[0032] Figure 4 This is a schematic diagram of the structure of a mounting bracket provided in an embodiment of the present invention;

[0033] Figure 5 This is a schematic diagram of the structure of the powder shoe in a powder pressing system provided in another embodiment of the present invention;

[0034] Figure 6 This is a schematic diagram showing the connection between the mounting bracket, the slider, and the linear drive component according to another embodiment of the present invention;

[0035] Figure 7 This is the flow chart of the powder feeding error control method provided in the embodiments of the present invention. Figure 1 ;

[0036] Figure 8 This is the flow chart of the powder feeding error control method provided in the embodiments of the present invention. Figure 2 .

[0037] In the picture:

[0038] 1. Material shoe body; 2. Feeding pipe; 3. Paddle; 4. Linear drive component; 41. Dovetail slide rail; 42. Limiting boss; 5. Slider; 6. Mounting bracket; 61. First mounting plate; 62. Second mounting plate; 71. First fastener; 72. Third fastener;

[0039] 100. Powder shoe; 200. Controller. Detailed Implementation

[0040] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0041] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0042] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0043] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0044] like Figures 1 to 4 As shown, this embodiment provides a powder feeding error control method and a powder pressing system. The powder pressing system is used to implement the powder feeding error control method. The powder pressing system includes a pressing mold, multiple powder boots 100, and multiple metering units. The pressing mold includes a template with multiple pressing cavities on its upper surface. Each powder boot 100 includes a boot body 1 with at least one discharge port at its bottom, a paddle 3 corresponding to each discharge port, and a drive unit corresponding to each paddle 3. The multiple discharge ports correspond to the multiple pressing cavities. Powder in the boot body 1 can fall into the corresponding pressing cavity through the discharge port. The drive unit can drive the corresponding paddle 3 to adjust the opening of the corresponding discharge port. The multiple metering units correspond to the multiple pressing cavities and are used to measure the amount of powder falling into the corresponding pressing cavity.

[0045] For example, the metering unit is a weighing structure used to measure the mass of powder falling into the pressing chamber. In other embodiments, the metering unit may also employ a structure capable of measuring the powder falling into the pressing chamber, which will not be listed here. For example, as... Figure 1 As shown, the powder shoe 100 has a discharge port at its bottom. In other embodiments, such as Figure 5 and Figure 6 As shown, the powder shoe 100 has two discharge ports at its bottom. It should be noted that the number of discharge ports at the bottom of the powder shoe 100 is not limited to one or two; it can also have three, four, five, or more discharge ports, which will not be described in detail here.

[0046] The powder pressing system also includes a controller 200, which is electrically connected to the metering unit and the drive unit. The metering unit sends the measured signal to the controller 200, and the controller 200 controls the drive unit to drive the lever 3 to adjust the opening of the discharge port based on the signal from the metering unit. It should be noted that the controller 200 can be a computer, etc. The specific connection method and signal transmission between the controller 200 and the metering unit and the drive unit are existing technologies in the field and will not be described in detail here.

[0047] In some embodiments, the upper end of the material shoe body 1 is provided with a feeding port, which is connected to a feeding pipe 2. A deflector 3 is located below the discharge port, and the deflector 3 is in clearance fit with the opening end face of the discharge port. Powder enters the material shoe body 1 through the feeding pipe 2, and then uses its own gravity to assist the powder to be discharged through the discharge port. This facilitates the adjustment of the opening of the discharge port by the deflector 3, and the clearance fit between the deflector 3 and the opening end face of the discharge port can improve the smoothness of the movement of the deflector 3. For example, the gap between the deflector 3 and the opening end face of the discharge port is 0.01mm-0.15mm.

[0048] In some embodiments, the drive unit includes a linear drive 4 and a slider 5. The movable end of the linear drive 4 is connected to a paddle 3. The slider 5 is slidably connected to one of the fixed end of the linear drive 4 and the paddle 3 in a first horizontal direction, and is fixedly connected to the other.

[0049] For example, the linear drive 4 is a linear motor, the slider 5 is slidably connected to the fixed end of the linear motor along the first horizontal direction, and the slider 5 is connected to the paddle 3 by a plurality of first fasteners 71 such as screws. This configuration can improve the stability of the paddle 3 when the linear drive 4 drives it to slide along the first horizontal direction.

[0050] Specifically, the linear drive member 4 is provided with a dovetail slide rail 41, and the slider 5 is provided with a dovetail groove. The dovetail slide rail 41 and the dovetail groove slide in a sliding engagement along the first horizontal direction, which not only guides the movement of the slider 5 relative to the linear drive member 4 in the first horizontal direction, but also limits the slider 5 in the vertical direction to prevent the slider 5 from disengaging from the linear drive member 4. In other embodiments, the dovetail slide rail 41 may also be provided on the slider 5, and the dovetail groove may be provided on the linear drive member 4.

[0051] In order to limit the range of movement of slider 5 along the first horizontal direction, so as to limit the range of movement of paddle 3 along the first horizontal direction, dovetail slide rail 41 is provided with two limiting bosses 42 arranged at intervals along the first horizontal direction. Slider 3 is located between the two limiting bosses 42, and slider 5 can abut against either of the two limiting bosses 42 along the first horizontal direction.

[0052] In other embodiments, the linear drive 4 can also be a structure such as a cylinder that can achieve linear movement. The slider 5 can also be omitted, and the drive unit can directly drive the paddle 3 to rotate to adjust the opening of the discharge port, thereby adjusting the feeding amount.

[0053] In some embodiments, the powder shoe 100 further includes a mounting frame 6, which includes a first mounting plate 61 and a second mounting plate 62. The first mounting plate 61 and the second mounting plate 62 are connected to form an L-shaped structure. The first mounting plate 61 is connected to the powder shoe body 1, and the second mounting plate 62 is connected to the fixed end of the linear drive member 4. Exemplarily, the second mounting plate 62 is connected to the fixed end of the linear drive member 4 by a plurality of second fasteners such as screws.

[0054] Two first mounting plates 61 are provided, and the two first mounting plates 61 are spaced apart along a second horizontal direction. The paddle 3 can pass through the gap between the two first mounting plates 61. This avoids the first mounting plates 61 interfering with the movement of the paddle 3. Exemplarily, the first mounting plates 61 and the second mounting plates 62 can be integrally molded parts, and each first mounting plate 61 is connected to the shoe body 1 by a plurality of third fasteners 72 such as screws.

[0055] like Figure 7 As shown, the above-mentioned powder feeding error control method includes the following steps:

[0056] S10. Each time material is fed, the actual material quantity of each outlet is obtained, the average value of the actual material quantity of multiple outlets is determined, and the difference between the actual material quantity of each outlet and the average value is calculated as the single error of each outlet.

[0057] S20. Calculate the sum of the single errors of any discharge port during multiple feedings, and use it as the cumulative error of that discharge port.

[0058] S30. When the maximum value of the cumulative error among multiple discharge ports exceeds the allowable threshold, adjust the opening of the discharge port according to the cumulative error of each discharge port.

[0059] The powder feeding error control method provided by this invention determines the average value of the actual feeding amount of multiple discharge ports, calculates the difference between the actual feeding amount of each discharge port and the average value, and uses it as the single error of each discharge port. The sum of the single errors of any discharge port during multiple feedings is used as the cumulative error of that discharge port. When the maximum value of the cumulative error of multiple discharge ports exceeds the allowable threshold, the opening of the discharge port is adjusted according to the cumulative error of each discharge port, thereby reducing the single weight difference between different products within a pressing cycle and improving product consistency.

[0060] For ease of description, the mass of powder fed at the i-th outlet during the j-th measurement is denoted as m. i,j , 1≤i≤N.

[0061] In step S10, the average value of the actual material quantity at multiple discharge ports during the j-th feeding is denoted as T. j ,

[0062] To improve consistency, the difference in powder quality between multiple discharge ports during a single feeding should be minimized, meaning the powder quality fed from each discharge port should be as close as possible to T. j T j This refers to the adjustment target during a single feeding.

[0063] The cumulative error during the j-th measurement at the i-th discharge port is denoted as W. i,j W i,j =W i,j-1 +m i,j -T j Among them, W i,j-1 This represents the cumulative error during the (j-1)th measurement at the i-th discharge port.

[0064] In step S30, if the maximum value of the cumulative error among multiple discharge ports exceeds the allowable threshold during the j-th feeding, then the opening size of the i-th discharge port is S. i Specifically, let the allowable threshold be denoted as C, and the maximum value among the cumulative errors of multiple discharge ports during the j-th feeding is max(W). i,j ), max(W i,j When ) > C, the opening of each discharge port is adjusted. The adjustment amount of the opening of the i-th discharge port. The opening adjustment amount of the i-th discharge port can be obtained according to the above formula. Where R represents the amount of discharge port opening adjustment required to control the unit mass adjustment.

[0065] In some embodiments, in order to further improve the difference in feeding amount between different discharge ports during a single feeding, if the number of feedings reaches the allowable number of feedings within a feeding cycle, the opening of the discharge port is adjusted according to the cumulative error of each discharge port when the number of feedings reaches the allowable number of feedings.

[0066] Specifically, the allowable number of feeding operations within a cycle is denoted as Q times. If the number of feeding operations reaches Q times within a feeding cycle, the opening of the discharge port is adjusted regardless of whether the maximum cumulative error among multiple discharge ports exceeds the allowable threshold. The adjustment amount for the opening of the i-th discharge port is S. i .

[0067]

[0068] In some embodiments, the cumulative error and the number of feeding times are reset to zero once the opening of all discharge ports has been adjusted.

[0069] Figure 8 This is a flowchart of a preferred embodiment of the powder feeding error control method provided by the present invention, as shown below. Figure 8 As shown, the powder feeding error control method includes the following steps:

[0070] S100. During the j-th feeding, obtain the actual feeding amount of each of the multiple discharge ports, determine the average value of the actual feeding amount of the multiple discharge ports, and calculate the difference between the actual feeding amount of each discharge port and the average value as the single error of each discharge port.

[0071] S200. Calculate the sum of the single errors of any discharge port during j feedings, and use it as the cumulative error of that discharge port.

[0072] S300: Determine whether the maximum value of the cumulative error among multiple discharge ports during j feedings exceeds the allowable threshold. If yes, execute S400; otherwise, execute 500.

[0073] S400: Adjust the opening of the discharge port according to the cumulative error of each discharge port, and clear the cumulative error and the number of feeding times to zero;

[0074] S500: Determine if the number of feeding operations has reached the allowed number of feeding operations. If yes, execute S400. If no, set the number of feeding operations j = j + 1, and then return to S100.

[0075] It should be noted that steps S300 and S500 can be interchanged.

[0076] Furthermore, the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A powder feeding error control method for a powder pressing system, characterized in that, Includes the following steps: Each time material is fed, the actual amount of material fed into each outlet of each powder shoe is obtained, the average value of the actual amount of material fed into multiple outlets is determined, the difference between the actual amount of material fed into each outlet and the average value is calculated, and the difference is used as the single error of each outlet. The sum of the single errors of any of the discharge ports during multiple feedings is calculated as the cumulative error of the discharge port. When the maximum value of the cumulative error among the multiple discharge ports exceeds the allowable threshold, the opening of the discharge port is adjusted according to the cumulative error of each discharge port.

2. The powder feeding error control method according to claim 1, characterized in that, When the maximum value of the cumulative error among the multiple discharge ports exceeds an allowable threshold, the opening degree of each discharge port is adjusted according to the cumulative error of each discharge port, including: The opening adjustment amount of the i-th discharge port , 1≤i≤N; Wherein, N represents the total number of the plurality of discharge ports; R represents the cumulative error during the j-th feeding at the i-th discharge port; j represents the number of feedings when the maximum value of the cumulative error of the multiple discharge ports exceeds the allowable threshold; R represents the opening adjustment amount of the discharge port required for unit mass adjustment.

3. The powder feeding error control method according to claim 1, characterized in that, If the number of feedings reaches the allowable number of feedings within a feeding cycle, the opening of the discharge port is adjusted according to the cumulative error of each discharge port when the number of feedings reaches the allowable number of feedings.

4. The powder feeding error control method according to claim 3, characterized in that, The opening of each discharge port is adjusted according to the cumulative error of each discharge port when the number of feedings reaches the allowable number of feedings: The opening adjustment amount of the i-th discharge port , 1≤i≤N; Wherein, N represents the total number of the plurality of discharge ports; R represents the cumulative error during the Qth feeding at the i-th discharge port within a feeding cycle; Q represents the allowable number of feedings within a feeding cycle; and R represents the amount of discharge port opening adjustment required for unit mass adjustment.

5. The powder feeding error control method according to any one of claims 1 to 4, characterized in that, Once the opening of all the discharge ports has been adjusted, the cumulative error and the number of feeding times are reset to zero.

6. A powder pressing system, characterized in that, For performing the powder feeding error control method according to any one of claims 1 to 5, the powder pressing system comprises: A pressing mold, the pressing mold including a template, the upper surface of the template being provided with a plurality of pressing cavities; Multiple powder boots (100), each of the powder boots (100) includes a boot body (1) with at least one discharge port at the bottom, a paddle (3) corresponding to each discharge port, and a drive unit corresponding to each paddle (3). The multiple discharge ports correspond to multiple pressing chambers. The powder in the boot body (1) can fall into the corresponding pressing chamber through the discharge port. The drive unit can drive the corresponding paddle (3) to adjust the opening of the corresponding discharge port. Multiple metering units are provided, and each metering unit corresponds to one of the multiple pressing chambers. The metering units are used to measure the amount of powder falling into the corresponding pressing chamber.

7. The powder pressing system according to claim 6, characterized in that, The paddle (3) is located below the discharge port, and the paddle (3) is in clearance fit with the opening end face of the discharge port.

8. The powder pressing system according to claim 7, characterized in that, The driving unit includes a linear drive (4) and a slider (5). The movable end of the linear drive (4) is connected to the paddle (3). The slider (5) is slidably connected to the fixed end of the linear drive (4) along the first horizontal direction. The slider (5) is fixedly connected to the paddle (3).

9. The powder pressing system according to claim 8, characterized in that, The powder shoe (100) also includes a mounting frame (6), which includes a first mounting plate (61) and a second mounting plate (62), and the first mounting plate (61) and the second mounting plate (62) are connected to form an L-shaped structure; The first mounting plate (61) is connected to the material shoe body (1), and the second mounting plate (62) is connected to the fixed end of the linear drive (4).

10. The powder pressing system according to claim 9, characterized in that, There are two first mounting plates (61), and the two first mounting plates (61) are arranged at intervals along the second horizontal direction. The first horizontal direction is perpendicular to the second horizontal direction, and the paddle (3) can pass through the gap between the two first mounting plates (61).

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