Auxiliary grinding mechanism of automatic grinder and secondary grinding control method

Abstract

The present application relates to the technical field of grinding equipment, and provides a secondary grinding mechanism of an automatic grinding machine, which is arranged in a grinding shell and comprises a material falling hopper, a camera assembly, a material distribution mechanism, a grinding part, a grinding wall and a material collecting barrel, the camera assembly is arranged in the grinding shell and is used for shooting and transmitting an image in the material falling hopper; the material distribution mechanism at least comprises a material distribution valve, a side material distribution pipeline and a bottom material distribution pipeline, and the material distribution valve is installed at a discharge port of the material falling hopper; and a secondary grinding control method is also disclosed; according to the present application, the actual condition of powder in the material falling hopper can be observed in the grinding shell, and the powder can be directly conveyed for discharge or conveyed for secondary grinding, so that the control is convenient and labor is saved.

Description

Technical Field

[0001] This invention relates to the field of grinding equipment technology, and in particular to an auxiliary grinding mechanism and a secondary grinding control method for an automatic grinding machine. Background Technology

[0002] In industrial applications, such as in grain processing plants, various conveyors are often used to transport grain particles, such as corn kernels, which usually need to be ground and pulverized into powder for use.

[0003] CN115921061B discloses a grinding mechanism, including a grinding plate with a cavity at its top; an actuating unit disposed inside the grinding plate; a grinding head embedded in the bottom of the grinding plate and capable of extending downward through the grinding plate under the control of the actuating mechanism; a reset groove formed on the grinding plate on one side of the grinding head; a limiting ring located in the reset groove and fixed outside the grinding head; and a reset spring located in the reset groove and at the bottom of the limiting ring. The grinding head can extend through the grinding plate to perform grinding work and can also extend downward through the holes of the grinding sieve plate to unclog the grinding sieve plate. The beneficial effects of this invention are: it can perform unclogging work while grinding, which is convenient, effective, and has a wide range of applications.

[0004] In existing technologies, after grinding materials, some particles are still too large to meet the discharge requirements. To address this, two common methods are used: first, a secondary grinding mechanism is installed within the grinding mill, and multiple grinding processes are performed to ensure the material meets the discharge requirements; second, after grinding and discharge, manual judgment is made to determine if the material meets the discharge requirements, and if not, the grinding process is repeated. However, existing methods have the following problems: multiple grinding processes consume significant energy; when the discharge requirements can be met in a single grinding cycle, the secondary grinding mechanism significantly increases energy consumption; manual judgment after discharge is time-consuming and labor-intensive; and if the material does not meet the discharge requirements, it needs to be re-fed and discharged, which is inconvenient. Summary of the Invention

[0005] In existing technologies, after grinding materials, some particles are still too large to meet the discharge requirements. To address this, two common methods are used: first, a secondary grinding mechanism is installed within the grinding mill, and multiple grinding processes are performed to ensure the material meets the discharge requirements; second, after grinding and discharge, manual judgment is made to determine if the material meets the discharge requirements, and if not, the grinding process is repeated. However, existing methods have the following problems: multiple grinding processes consume significant energy; when the discharge requirements can be met in a single grinding cycle, the secondary grinding mechanism significantly increases energy consumption; manual judgment after discharge is time-consuming and labor-intensive; and if the material does not meet the discharge requirements, it needs to be re-fed and discharged, which is inconvenient.

[0006] In view of this, the present invention aims to provide a secondary grinding mechanism for an automatic grinding machine, which is disposed within a grinding housing. The grinding housing contains a grinding assembly. In this invention, the secondary grinding mechanism is located at the bottom of the grinding assembly. The secondary grinding mechanism includes a hopper, a camera assembly, a feeding mechanism, grinding media, a grinding wall, a collecting cylinder, and a particle identification system.

[0007] The hopper is fixed inside the grinding housing and located at the bottom of the grinding assembly for collecting the powder after grinding by the grinding assembly. The camera assembly is set inside the grinding housing for capturing and transmitting images inside the hopper.

[0008] The grinding wall is fixed on the inner wall of the grinding housing, the grinding element is disposed at the bottom of the hopper and cooperates with the grinding wall to perform grinding work, and the collecting cylinder is disposed at the bottom of the grinding housing;

[0009] The batching mechanism is located at the bottom outlet of the hopper. The batching mechanism includes at least a batching valve, a side batching pipeline, and a bottom batching pipeline. The batching valve is installed at the outlet of the hopper. The bottom batching pipeline connects the batching valve and the collecting cylinder. One end of the side batching pipeline is connected to the batching valve, and the other end faces the grinding wall.

[0010] The particle recognition system is connected to the camera assembly and the dispensing mechanism. The particle recognition system is used to receive and analyze the images captured by the camera assembly, and to determine whether there are unground particles in the powder in the hopper based on the images. The particle recognition system controls the operation of the dispensing mechanism based on the determination result.

[0011] Furthermore, a grinding channel is provided between the grinding element and the grinding wall, a guide block is provided inside the grinding housing, one end of the side feeding pipeline faces the guide block, and one end of the guide block is located at the upper end of the grinding channel.

[0012] Furthermore, the grinding component includes a fixed rod, a swing rod, a transmission rod, a grinding block, and a driving component;

[0013] The fixed rod is fixed inside the grinding housing. The swing rod is configured as two rods and is respectively arranged on both sides of the fixed rod. The middle part of the swing rod is hinged to the fixed rod. The grinding block is fixed to one end of the swing rod and contacts the grinding wall.

[0014] The two ends of the transmission rod are respectively hinged to the two swing rods, and the transmission rod is located at the end of the swing rod away from the grinding block; the driving member is used to drive one of the swing rods to swing back and forth.

[0015] Furthermore, the driving component includes a drive motor, a drive rod, a linkage rod, and a connecting rod;

[0016] The drive motor is installed inside the grinding housing and drives the drive rod to rotate.

[0017] One end of the linkage rod is hinged to the inner wall of the grinding housing. A sliding groove is provided on the linkage rod, and a hinge seat is slidably disposed in the sliding groove. The hinge seat is hinged to one end of the drive rod.

[0018] The linkage includes a first linkage and a second linkage, with one end of the first linkage and one end of the second linkage hinged together. The first linkage is hinged to one of the swing rods, and the second linkage is hinged to one end of the linkage rod.

[0019] Furthermore, the grinding block has a cavity inside, a grinding auxiliary component is disposed inside the cavity, and an opening is provided at the bottom of the grinding block for the grinding auxiliary component to enter and exit.

[0020] The grinding auxiliary component includes a connecting plate, grinding heads, springs, and several plug-in blocks of different thicknesses. Several grinding heads are evenly arranged on the connecting plate. A through hole is opened on the side of the grinding block facing the grinding wall for the grinding heads to pass through. The spring is located on the side of the connecting plate facing the through hole, with one end of the spring connected to the connecting plate and the other end abutting against the inner wall of the grinding block. The plug-in blocks are located on the side of the connecting plate away from the through hole.

[0021] Furthermore, the inner wall of the opening is provided with internal threads, and the opening can be threaded to a pipe fitting, which is connected to an external water pump.

[0022] Furthermore, the collecting cylinder is connected to the screw conveyor, and an opening and closing valve is provided on the collecting cylinder. When the opening and closing valve is opened, the screw conveyor starts.

[0023] This invention also discloses a secondary grinding control method, applicable to the secondary grinding mechanism of the aforementioned automatic grinding machine, comprising:

[0024] Step S1: Acquire an image of powder accumulation in the hopper, divide the powder accumulation image into multiple block images, and perform image preprocessing on each of the multiple block images to obtain the first image data;

[0025] Step S2: Perform feature extraction on the first image data, extract the particle coverage area ratio value in the first image data, and determine whether the particle coverage area ratio value is greater than a preset threshold.

[0026] Step S3: If the particle coverage area ratio is greater than a preset threshold, the first image data is marked. After marking all the first image data one by one, it is determined whether the number of marked first image data is greater than two.

[0027] Step S4: If the number of identified first image data is greater than two, feature extraction is performed on the identified first image data again to extract the particle size of the particles in the first image data and form a particle size curve chart. The maximum particle size value in the particle size curve chart is compared with a preset particle size threshold.

[0028] Step S5: If the maximum particle size value in the particle size curve chart is greater than the preset particle size threshold, a secondary grinding signal is issued.

[0029] Step S6: After receiving the secondary grinding signal, start the execution module. The execution module controls the feeding mechanism to open the side feeding pipeline and transport the powder in the hopper to the secondary grinding mechanism. Start the drive motor to drive the grinding component to perform secondary grinding on the powder. The powder after secondary grinding falls into the collection cylinder.

[0030] In step S7, the execution module synchronously opens the screw conveyor to deliver the powder that has fallen into the collecting cylinder.

[0031] Furthermore, step S3 also includes:

[0032] The particle coverage area ratio is compared with a preset red line threshold.

[0033] If the particle coverage area ratio is greater than the preset red line threshold, a secondary grinding signal will be issued directly.

[0034] Further, the identification of the first image data in step S3 includes:

[0035] Each of the first image data whose particle coverage area ratio is greater than a preset threshold is identified to obtain the first identified image data.

[0036] Determine whether each particle in the first identification image data is a powder void. If at least part of the particles in the first identification image data are powder voids, calculate the powder void coverage area ratio.

[0037] The actual particle coverage area ratio is calculated based on the powder void coverage area ratio and the particle coverage area ratio, and it is determined whether the actual particle coverage area ratio is greater than the preset threshold.

[0038] If the actual particle coverage area ratio is greater than the preset threshold, then the first identified image data is the identified first image data; otherwise, the identification of the first identified image data is cancelled.

[0039] The secondary grinding mechanism of the automatic grinding machine disclosed in this invention, through the setting of the feeding mechanism, can select to directly transport the powder to the collecting cylinder for collection, or to transport the powder to the grinding block to cooperate with the grinding wall for secondary grinding, according to the actual condition of the powder in the hopper. The control is convenient, and the condition of the powder after the first grinding can be observed and judged directly in the hopper, so as to make a decision on whether to perform secondary grinding directly inside the grinding shell, saving labor and avoiding the back-and-forth transportation of powder. At the same time, by changing the grinding method of the secondary grinding to oscillating grinding, which is different from the grinding disc grinding method of the primary grinding, the grinding effect of the secondary grinding is improved, and the stable oscillating grinding of the grinding block can be achieved by driving the drive rod to rotate through the drive motor, which is convenient to control.

[0040] The secondary grinding control method disclosed in this invention forms an image of the powder state in the hopper for identification and judgment. The particle coverage area ratio and particle size curve are extracted from the image. A dual judgment method is used to judge the particle state in the powder, thereby determining whether secondary grinding is required. The method uses sequential judgment and identifies powder voids, which can avoid errors, save steps, and improve overall efficiency.

[0041] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0042] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0043] Figure 1 This is a schematic diagram of the structure of a grinding machine in one embodiment of the present invention;

[0044] Figure 2 This is a side view of a grinding machine according to one embodiment of the present invention;

[0045] Figure 3 This is a schematic diagram of the interior of the grinding housing in one embodiment of the present invention;

[0046] Figure 4 This is a schematic diagram of the structure of the grinding component in one embodiment of the present invention;

[0047] Figure 5 This is a schematic diagram of the movement of the grinding block in one embodiment of the present invention;

[0048] Figure 6This is a schematic diagram of the internal structure of the grinding block in one embodiment of the present invention;

[0049] Figure 7 This is a schematic diagram of the pipe joint connection in one embodiment of the present invention;

[0050] Figure 8 This is a flowchart illustrating one embodiment of the present invention.

[0051] Explanation of reference numerals in the attached figures:

[0052] 1. Grinding shell; 2. Grinding disc; 3. Opening and closing door; 4. Screen; 5. Screw conveyor; 6. Guide block; 7. Feed hopper; 8. Grinding parts; 81. Fixed rod; 82. Swing rod; 83. Transmission rod; 84. Grinding block; 841. Connecting plate; 842. Grinding head; 843. Spring; 844. Insertion block; 845. Pipe joint; 85. Driving component; 851. Driving rod; 852. Linkage rod; 853. First connecting rod; 854. Second connecting rod; 855. Hinge seat; 856. Slide groove; 9. Feeding mechanism; 91. Bottom feeding pipeline; 92. Side feeding pipeline; 10. Grinding wall; 11. Collection cylinder. Detailed Implementation

[0053] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0054] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0055] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of the invention described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or devices. "Fixed" or "fixed connection" generally refers to common mechanical connection methods, such as threaded connections, welding, or bonding.

[0056] In existing technologies, after grinding materials, some particles are still too large to meet the discharge requirements. To address this, two common methods are used: first, a secondary grinding mechanism is installed within the grinding mill, and multiple grinding processes are performed to ensure the material meets the discharge requirements; second, after grinding and discharge, manual judgment is made to determine if the material meets the discharge requirements, and if not, the grinding process is repeated. However, existing methods have the following problems: multiple grinding processes consume significant energy; when the discharge requirements can be met in a single grinding cycle, the secondary grinding mechanism significantly increases energy consumption; manual judgment after discharge is time-consuming and labor-intensive; and if the material does not meet the discharge requirements, it needs to be re-fed and discharged, which is inconvenient.

[0057] This invention provides a secondary grinding mechanism for an automatic grinding machine, which is set in such a way as... Figure 1 , Figure 2 and Figure 3 The grinding mill shown includes a grinding housing 1 and grinding components disposed within the grinding housing 1. The grinding housing 1 serves as the main outer shell structure and has a feed inlet and a discharge outlet. A door 3 is installed at the feed inlet. During feeding, the door 3 folds open; when the mill is not in use, it closes the feed inlet to prevent external dust from entering. A screen 4 is also installed at the feed inlet to remove excessively large or substandard raw materials. The screen 4 is detachably installed within the grinding housing 1 for easy disassembly and cleaning. A screw conveyor 5 is installed at the discharge outlet to transport the ground powder to a designated location, fulfilling the requirement of conveying from a low to a high position. An electrically controlled valve is installed at the discharge outlet. When the valve opens, the screw conveyor 5 automatically starts to transport the material, achieving automatic feeding. The grinding mechanism consists of multiple grinding discs 2 that cooperate to perform grinding operations.

[0058] The secondary grinding mechanism of the present invention is located at the bottom of the grinding assembly. The secondary grinding mechanism includes a hopper 7, a camera assembly, a feeding mechanism 9, a grinding element 8, a grinding wall 10, a collecting cylinder 11, and a particle identification system. The hopper 7 is fixed inside the grinding housing 1 and located at the bottom of the grinding assembly, and is used to collect the powder after grinding by the grinding assembly. In order to realize the secondary grinding work, the grinding element 8 works in conjunction with the grinding wall 10 to carry out the grinding work. To ensure the stability of the grinding, the grinding wall 10 is fixed on the inner wall of the grinding housing 1. The grinding element 8 is located at the bottom of the hopper 7 to facilitate the transportation of the powder in the hopper 7 to the grinding element 8 for secondary grinding. A grinding channel is provided between the grinding element 8 and the grinding wall 10, and the secondary grinding is carried out in the grinding channel. In order to facilitate the collection of the ground powder, a collecting cylinder 11 is provided. The collecting cylinder 11 is connected to and fixed to the grinding housing 1, and is fixed at the bottom of the grinding housing 1.

[0059] To determine whether secondary grinding is required, a camera assembly and a particle recognition system are installed. The camera assembly is placed inside the grinding housing 1 to capture images of the material in the hopper 7 and transmits the captured images to the particle recognition system. The particle recognition system is mainly used to identify whether there are incompletely ground particles in the powder in the hopper 7 after the first grinding. The particle recognition system is connected to the camera assembly and the dispensing mechanism 9. The particle recognition system receives the images captured by the camera assembly and analyzes the images to determine whether there are incompletely ground particles in the powder in the hopper 7. If there are no incompletely ground particles in the powder, the powder is directly sent to the collecting cylinder 11 through the dispensing mechanism 9. If there are incompletely ground particles in the powder, it means that the first grinding was incomplete and the powder needs to be sent to the grinding element 8 for secondary grinding through the dispensing mechanism 9. To facilitate the distribution of powder, the particle recognition system and the dispensing mechanism 9 are linked for control.

[0060] Based on this, the batching mechanism 9 is configured as a batching valve, a side batching pipe 92, and a bottom batching pipe 91. The batching valve is installed at the discharge port of the hopper 7. The bottom batching pipe 91 connects the batching valve and the collecting cylinder 11, allowing powder to directly enter the collecting cylinder 11 through the bottom batching pipe. One end of the side batching pipe 92 is connected to the batching valve, and the other end faces the grinding wall 10, allowing powder to directly enter the grinding wall 10 for secondary grinding. The bottom batching pipe and the side batching pipe are controlled by the batching valve to open and close, and the bottom batching pipe and the side batching pipe can only be used alternately and cannot be opened simultaneously. The batching valve is connected to the particle identification system and is controlled by the particle identification system to switch between open and closed states.

[0061] To ensure that the powder in the hopper 7 can smoothly enter the bottom and side feeding pipes, an auxiliary mechanism to assist in discharge is provided. In this embodiment, it is a vibrator installed at the bottom of the hopper 7. When discharging, the vibrator is activated to drive the hopper 7 to vibrate, so that the powder in the hopper 7 can smoothly enter the bottom and side feeding pipes. At the same time, the side feeding pipe is set to be inclined downward. A guide block 6 is provided in the grinding housing 1. One end of the side feeding pipe 92 faces the guide block 6, and one end of the guide block 6 is located at the upper end of the grinding channel.

[0062] The present invention, through the setting of the feeding mechanism 9, can select to directly transport the powder to the collecting cylinder 11 for collection, or to transport the powder to the grinding part 8 to cooperate with the grinding wall 10 for secondary grinding, according to the actual condition of the powder in the hopper 7. The control is convenient, and the condition of the powder after the first grinding can be observed and judged directly in the hopper 7, so as to make a decision on whether to perform secondary grinding directly inside the grinding shell 1, saving labor and avoiding the back-and-forth transportation of powder.

[0063] The secondary grinding process discards the grinding disc used in the primary grinding process, changes the grinding method to improve the grinding effect, and optimizes the structure of the grinding part 8. Specifically, for example... Figure 4 and Figure 5 As shown, the grinding component 8 is configured as a fixed rod 81, a swing rod 82, a transmission rod 83, a grinding block 84, and a driving component 85. The fixed rod 81 is fixed inside the grinding housing 1. Two swing rods 82 are respectively located on both sides of the fixed rod 81, with the middle of each swing rod 82 hinged to the fixed rod 81. The grinding block 84 is fixed to one end of the swing rod 82 and contacts the grinding wall 10. The two ends of the transmission rod 83 are respectively hinged to the two swing rods 82, with the transmission rod 83 located at the end of the swing rod 82 away from the grinding block 84. The driving component 85 is used to drive one of the swing rods 82 to swing back and forth. A connecting protrusion is provided on one side of the swing rod 82, which is connected to the driving component 85. The driving component 85 drives the swing rod 82 to rotate along the hinge point with the fixed rod 81, thereby causing one grinding block 84 to swing against the grinding wall 10. The grinding process is performed with zero contact. Through the linkage of the transmission rod 83, another swing rod 82 and the grinding block 84 swing together to perform mechanical grinding. To facilitate the control of the swing rod 82, the driving component 85 is configured as a drive motor, a drive rod 851, a linkage rod 852, and a connecting rod. The drive motor is installed inside the grinding housing 1 to drive the drive rod 851 to rotate. One end of the linkage rod 852 is hinged to the inner wall of the grinding housing 1. A sliding groove 856 is provided on the linkage rod 852, and a hinge seat 855 is slidably arranged in the sliding groove 856. The hinge seat 855 is hinged to one end of the drive rod 851. By changing the grinding method of the secondary grinding to swing grinding, which is different from the grinding method of the grinding disc 2 in the primary grinding, the grinding effect of the secondary grinding is improved. Moreover, the stable swing grinding of the grinding block 84 can be achieved by driving the drive rod 851 to rotate through the drive motor, which is convenient to control.

[0064] To ensure the stable movement of the swing arm 82 and avoid motion interference, the connecting rods are configured as a first connecting rod 853 and a second connecting rod 854. One end of the first connecting rod 853 and one end of the second connecting rod 854 are hinged together. The first connecting rod 853 is hinged to one of the swing arms 82, and the second connecting rod 854 is hinged to one end of the linkage rod 852. Through the hinged movement between the first connecting rod 853 and the second connecting rod 854, the linkage between the swing arm 82 and the linkage rod 852 can be satisfied.

[0065] To improve the grinding effect of secondary grinding, the structure of grinding block 84 was improved and optimized, such as... Figure 6As shown, specifically: a cavity is provided inside the grinding block 84, and a grinding auxiliary component is provided inside the cavity. An opening is provided at the bottom of the grinding block 84 for the grinding auxiliary component to enter and exit. The grinding auxiliary component includes a connecting plate 841, a grinding head 842, a spring 843, and several insertion blocks 844 of different thicknesses. The insertion blocks 844 can be used together, or individual insertion blocks 844 of suitable thickness can be selected for use. Several grinding heads 842 are evenly arranged on the connecting plate 841. A through hole is provided on the side of the grinding block 84 facing the grinding wall 10 for the grinding head 842 to pass through. The spring 843 is located on the connecting plate 841 facing the grinding wall 10. On one side of the through hole, one end of the spring 843 is connected to the connecting plate 841, and the other end abuts against the inner wall of the grinding block 84. The insertion block 844 is located on the side of the connecting plate 841 away from the through hole. The spring 843 is set to abut against the inner wall of the grinding block 84 so that it can be easily detached from the grinding block. This makes it easy for the connecting plate 841 and the grinding head 842 to be taken out from the opening for replacement or cleaning. By replacing the insertion blocks 844 of different thicknesses, the length of the grinding head 842 protruding from the grinding block 84 can be controlled, thereby adjusting the grinding effect. This allows the grinding head 842 to be adjusted according to actual needs, thus adjusting the grinding effect of the secondary grinding.

[0066] To facilitate cleaning of the grinding part 8, such as Figure 7 As shown, an internal thread is provided on the inner wall of the opening of the grinding block 84. The opening can be threaded to connect the pipe connector 845. After the grinding part 8 has been used for a long time, the grinding block 84 and the grinding wall 10 need to be cleaned. During cleaning, the plug block 844 and the connecting plate 841 are disassembled, and then the pipe connector 845 is screwed on the opening. The pipe connector 845 is connected to an external water pump. The water pump is started to drive water into the grinding block 84 and spray it out from the through hole of the grinding block 84 to clean the inside of the grinding block 84, the through hole and the grinding wall 10. This makes the cleaning work convenient and does not require a separate cleaning pipeline.

[0067] This invention also discloses a secondary grinding control method, applicable to the secondary grinding mechanism of the aforementioned automatic grinding machine, such as... Figure 8 As shown, it includes:

[0068] Step S1: Collect an image of powder accumulation in the hopper 7, and divide the powder accumulation image into multiple block images. In this embodiment, the block images are divided into nine blocks in a nine-square grid format. Perform image preprocessing on the multiple block images to obtain the first image data.

[0069] Step S2: Perform feature extraction on the first image data, extract the particle coverage area ratio value in the first image data, and determine whether the particle coverage area ratio value is greater than a preset threshold.

[0070] Step S3: If the particle coverage area ratio is greater than a preset threshold, the first image data is marked. After marking all the first image data one by one, it is determined whether the number of marked first image data is greater than two.

[0071] Step S4: If the number of identified first image data is greater than two, feature extraction is performed on the identified first image data again to extract the particle size of the particles in the first image data and form a particle size curve chart. The maximum particle size value in the particle size curve chart is compared with a preset particle size threshold.

[0072] Step S5: If the maximum particle size value in the particle size curve chart is greater than the preset particle size threshold, a secondary grinding signal is issued.

[0073] Step S6: After receiving the secondary grinding signal, the execution module is started. The execution module controls the feeding mechanism 9 to open the side feeding pipeline 92, and transports the powder in the dropping hopper 7 to the secondary grinding mechanism. The drive motor is started to drive the grinding component to perform secondary grinding on the powder. The powder after secondary grinding falls into the collecting cylinder 11.

[0074] In step S7, the execution module synchronously opens the screw conveyor 5 to deliver the powder that has fallen into the collecting cylinder 11.

[0075] The particle coverage area ratio mentioned above is the area ratio of particles in the overall powder. The preset threshold and preset particle size threshold can be adjusted according to the actual use. The preset particle size threshold is preset according to the qualified particle size of the required product. The preset threshold is generally set no higher than 5%, otherwise the overall quality of the powder will be reduced and it will be difficult to guarantee the pass rate.

[0076] In cases where a large number of particles remain in the powder after the first grinding, to reduce the number of identification and judgment steps, step S3 further includes:

[0077] The particle coverage area ratio is compared with a preset red line threshold.

[0078] If the particle coverage area ratio is greater than the preset red line threshold, a secondary grinding signal will be issued directly.

[0079] By setting a preset red line threshold, when the particle coverage area ratio is greater than the preset red line threshold, it indicates that there are a large number of incompletely ground particles in at least some parts of the powder. In this case, the subsequent identification steps are not performed, and the secondary grinding begins directly.

[0080] To avoid recognition errors, further identification and judgment are performed on the identifiers. Step S3, identifying the first image data, includes:

[0081] Each of the first image data whose particle coverage area ratio is greater than a preset threshold is identified to obtain the first identified image data.

[0082] Determine whether each particle in the first identification image data is a powder void. If at least part of the particles in the first identification image data are powder voids, calculate the powder void coverage area ratio.

[0083] The actual particle coverage area ratio is calculated based on the powder void coverage area ratio and the particle coverage area ratio, and it is determined whether the actual particle coverage area ratio is greater than the preset threshold.

[0084] If the actual particle coverage area ratio is greater than the preset threshold, then the first identified image data is the identified first image data; otherwise, the identification of the first identified image data is cancelled.

[0085] By judging the first identification image data, it is confirmed whether there is a phenomenon of mistaking powder gaps for particles. The error caused by identification is eliminated, and the identification work is carried out only after accurate identification is confirmed, so as to ensure the accuracy of particle identification.

[0086] The secondary grinding control method disclosed in this invention forms an image of the powder state in the hopper 7 for identification and judgment. The particle coverage area ratio and particle size curve are extracted from the image. A dual judgment method is used to judge the particle state in the powder, thereby determining whether secondary grinding is required. The method uses sequential judgment and identifies powder voids, which can avoid errors, save steps, and improve overall efficiency.

[0087] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A secondary grinding mechanism for an automatic grinding machine, disposed within a grinding housing (1), wherein a grinding assembly is disposed within the grinding housing (1), characterized in that, The secondary grinding mechanism is located at the bottom of the grinding assembly. The secondary grinding mechanism includes a hopper (7), a camera assembly, a feeding mechanism (9), grinding parts (8), a grinding wall (10), a collecting cylinder (11), and a particle recognition system. The hopper (7) is fixed inside the grinding housing (1) and located at the bottom of the grinding assembly for collecting the powder after grinding by the grinding assembly. The camera assembly is set inside the grinding housing (1) for capturing and transmitting images inside the hopper (7). The particle recognition system is connected to the camera component and the feeding mechanism (9). The particle recognition system is used to receive the image captured by the camera component and analyze and judge the image to determine whether there are unground particles in the powder in the hopper (7). If there are unground particles in the powder, the feeding mechanism (9) sends the powder to the grinding part (8) for secondary grinding. The grinding wall (10) is fixed on the inner wall of the grinding housing (1), the grinding element (8) is set at the bottom of the hopper (7) and cooperates with the grinding wall (10) to perform grinding work, and the collecting cylinder (11) is set at the bottom of the grinding housing (1); The batching mechanism (9) is located at the bottom outlet of the hopper (7). The batching mechanism (9) includes at least a batching valve, a side batching pipe (92) and a bottom batching pipe (91). The batching valve is installed at the outlet of the hopper (7). The bottom batching pipe (91) connects the batching valve and the collecting cylinder (11). One end of the side batching pipe (92) is connected to the batching valve, and the other end faces the grinding wall (10). The grinding component (8) includes a fixed rod (81), a swing rod (82), a transmission rod (83), a grinding block (84), and a driving component (85). The fixed rod (81) is fixed inside the grinding housing (1). The swing rod (82) is set as two rods and is respectively set on both sides of the fixed rod (81). The middle part of the swing rod (82) is hinged to the fixed rod (81). The grinding block (84) is fixed at one end of the swing rod (82) and is in contact with the grinding wall (10). The two ends of the transmission rod (83) are respectively hinged to the two swing rods (82), and the transmission rod (83) is located at the end of the swing rod (82) away from the grinding block (84); the driving member (85) is used to drive one of the swing rods (82) to swing back and forth; The grinding block (84) has a cavity inside, and a grinding auxiliary component is provided inside the cavity. The bottom of the grinding block (84) has an opening for the grinding auxiliary component to enter and exit. The inner wall of the opening is provided with an internal thread. The opening can be threaded to a pipe joint (845). The pipe joint (845) is connected to an external water pump. The grinding auxiliary component includes a connecting plate (841), a grinding head (842), a spring (843), and several plug-in blocks (844) of different thicknesses. Several grinding heads (842) are evenly arranged on the connecting plate (841). A through hole is opened on the side of the grinding block (84) facing the grinding wall (10) for the grinding head (842) to pass through. The spring (843) is arranged on the side of the connecting plate (841) facing the through hole, and one end of the spring (843) is connected to the connecting plate (841), and the other end abuts against the inner wall of the grinding block (84). The plug-in block (844) is arranged on the side of the connecting plate (841) away from the through hole.

2. The secondary grinding mechanism of the automatic grinding machine according to claim 1, characterized in that, A grinding channel is provided between the grinding element (8) and the grinding wall (10). A guide block (6) is provided inside the grinding housing (1). One end of the side feeding pipeline (92) faces the guide block (6), and one end of the guide block (6) is located at the upper end of the grinding channel.

3. The secondary grinding mechanism of the automatic grinding machine according to claim 1, characterized in that, The driving component (85) includes a drive motor, a drive rod (851), a linkage rod (852), and a connecting rod; The drive motor is installed inside the grinding housing (1) and drives the drive rod (851) to rotate; One end of the linkage rod (852) is hinged to the inner wall of the grinding housing (1). A sliding groove (856) is provided on the linkage rod (852). A hinge seat (855) is slidably arranged in the sliding groove (856). The hinge seat (855) is hinged to one end of the drive rod (851). The connecting rod includes a first connecting rod (853) and a second connecting rod (854). One end of the first connecting rod (853) and one end of the second connecting rod (854) are hinged together. The first connecting rod (853) is hinged together with a swing rod (82). The second connecting rod (854) is hinged together with one end of the linkage rod (852).

4. The secondary grinding mechanism of the automatic grinding machine according to claim 1 or 2, characterized in that, The collecting cylinder (11) is connected to the screw conveyor (5). The collecting cylinder (11) is equipped with an opening and closing valve. When the opening and closing valve is opened, the screw conveyor (5) starts.

5. A secondary grinding control method, used in the secondary grinding mechanism of the automatic grinding machine as described in claim 1, characterized in that, include: Step S1: Acquire an image of powder accumulation in the hopper, divide the powder accumulation image into multiple block images, and perform image preprocessing on each of the multiple block images to obtain the first image data; Step S2: Perform feature extraction on the first image data, extract the particle coverage area ratio value in the first image data, and determine whether the particle coverage area ratio value is greater than a preset threshold. Step S3: If the particle coverage area ratio is greater than a preset threshold, the first image data is marked. After marking all the first image data one by one, it is determined whether the number of marked first image data is greater than two. Step S4: If the number of identified first image data is greater than two, feature extraction is performed on the identified first image data again to extract the particle size of the particles in the first image data and form a particle size curve chart. The maximum particle size value in the particle size curve chart is compared with a preset particle size threshold. Step S5: If the maximum particle size value in the particle size curve chart is greater than the preset particle size threshold, a secondary grinding signal is issued. Step S6: After receiving the secondary grinding signal, start the execution module. The execution module controls the feeding mechanism to open the side feeding pipeline and transport the powder in the hopper to the secondary grinding mechanism. Start the drive motor to drive the grinding component to perform secondary grinding on the powder. The powder after secondary grinding falls into the collection cylinder. In step S7, the execution module synchronously opens the screw conveyor to deliver the powder that has fallen into the collecting cylinder.

6. The secondary grinding control method according to claim 5, characterized in that, Step S3 further includes: The particle coverage area ratio is compared with a preset red line threshold. If the particle coverage area ratio is greater than the preset red line threshold, a secondary grinding signal will be issued directly.

7. The secondary grinding control method according to claim 5, characterized in that, The step S3 of identifying the first image data includes: Each of the first image data whose particle coverage area ratio is greater than a preset threshold is identified to obtain the first identified image data. Determine whether each particle in the first identification image data is a powder void. If at least part of the particles in the first identification image data are powder voids, calculate the powder void coverage area ratio. The actual particle coverage area ratio is calculated based on the powder void coverage area ratio and the particle coverage area ratio, and it is determined whether the actual particle coverage area ratio is greater than the preset threshold. If the actual particle coverage area ratio is greater than the preset threshold, then the first identified image data is the identified first image data; otherwise, the identification of the first identified image data is cancelled.

Images