Mill, roll gap adjustment mechanism, and roll gap adjustment method

Abstract

The application provides a flour mill, a rolling distance adjusting mechanism and a rolling distance adjusting method. The rolling distance adjusting mechanism comprises a power component, an adjusting shaft, an adjusting arm and a control device. The adjusting shaft is connected with the power component through a transmission member and rotates under the drive of the power component. One end of the adjusting arm is axially and slidably installed on the adjusting shaft, and the other end of the adjusting arm is installed on one of the two rollers, so that the two rollers are pushed close to or away from each other when the adjusting shaft rotates. The control device is used for controlling the power component to drive the adjusting shaft to rotate. The rolling distance adjusting mechanism realizes automatic adjustment of the rolling distance, reduces the working strength of the operator, improves the working efficiency, has high accuracy of rolling distance adjustment, and further ensures the yield and quality of the ground agricultural products.

Description

Technical Field

[0001] This invention relates to the field of agricultural machinery, and more particularly to a grinding mill, a grinding gap adjustment mechanism, and a grinding gap adjustment method. Background Technology

[0002] In the process of agricultural product processing, wheat, rice, or corn are often processed into powder using a grinding mill. The rollers are an important structure of the grinding mill. The grinding of agricultural products is achieved by the rotation of two rollers. The distance between the roller surfaces is called the roller gap. The size of the roller gap will affect the particle size and yield of the powder, as well as the power consumption of the grinding mill.

[0003] In existing technologies, grinding mills mostly use a manual adjustment method with a mechanical handwheel to adjust the grinding distance. During the adjustment process, the operator needs to manually turn the mechanical handwheel, which results in high workload and low work efficiency for the operator. Moreover, the accuracy of the grinding distance adjustment is poor due to the operator's limited experience, and it is impossible to guarantee the output and quality of agricultural product grinding. Summary of the Invention

[0004] In view of this, the present invention provides a grinding mill, a rolling gap adjustment mechanism, and a rolling gap adjustment method, which at least partially solve the problems existing in the prior art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] This invention provides a method for adjusting the girth of a grinding mill, the grinding mill comprising at least two rollers and an adjusting shaft that adjusts the girth by rotation, the method comprising:

[0007] Obtain the first grinding degree under the first rolling gap;

[0008] The adjustment shaft is rotated by a first angle to complete the rough adjustment of the rolling gap and to obtain the second grinding degree under the second rolling gap;

[0009] Calculate the proportional relationship between the first angle and the difference between the second and first grinding degrees;

[0010] The second angle is determined based on the aforementioned proportional relationship and the target degree of grinding.

[0011] The rolling gap is finely adjusted by controlling the rotation of the adjusting shaft to a second angle.

[0012] In some embodiments, the method also includes roll gap monitoring:

[0013] When the rolling gap reaches the maximum threshold, the rotation in the direction that increases the rolling gap by adjusting the axial direction is locked.

[0014] When the rolling gap reaches the minimum threshold, the rotation in the direction that adjusts the axial direction to reduce the rolling gap is locked.

[0015] In some embodiments, obtaining the degree of grinding includes:

[0016] Within a preset time period, multiple grinding degree values ​​are continuously acquired;

[0017] Remove the maximum and minimum values ​​from the multiple grinding degree values;

[0018] Take the median of the remaining abrasion levels as the desired abrasion level.

[0019] This invention provides a rolling gap adjustment mechanism applied to the method described above, the rolling gap adjustment mechanism comprising:

[0020] Power components;

[0021] An adjusting shaft is connected to the power component via a transmission component and rotates under the drive of the power component.

[0022] An adjusting arm, one end of which is axially slidably mounted on the adjusting shaft, and the other end of which is mounted on one of the rolls, so as to push the roll closer to or away from the adjusting shaft when it rotates;

[0023] A control device is provided for controlling the power component to drive the adjusting shaft to rotate.

[0024] In some embodiments, the power component is a motor, which starts and stops in response to the control command, and the output shaft of the motor outputs a preset rotation stroke according to the control command.

[0025] In some embodiments, the motor is a stepper motor or a servo motor, and a power-off brake is installed on the motor or the adjustment handle.

[0026] In some embodiments, the transmission belt is respectively engaged with the output shaft of the motor and the adjusting shaft, so that the adjusting shaft is connected to the motor for transmission.

[0027] In some embodiments, it also includes:

[0028] The slider has one end of the adjusting arm mounted on it. The slider is sleeved on the adjusting shaft and is threadedly engaged with the adjusting shaft so that the slider moves axially when the adjusting shaft rotates.

[0029] In some embodiments, the roll gap adjustment mechanism includes:

[0030] A pen-touch sensor is mounted on the adjustment shaft and is used to acquire the current roll gap between the two rolls in real time.

[0031] The present invention also provides a grinding mill, comprising:

[0032] A hopper, wherein at least two rollers and a roller pitch adjustment mechanism as described above are installed inside the hopper;

[0033] The screening equipment has its inlet connected to the outlet of the silo, and its control device is connected to the control device of the roller gap adjustment mechanism, and the calculated grinding degree is fed back to the control device.

[0034] This invention provides a method for adjusting the girth of a grinding mill, which includes at least two rollers and an adjusting shaft that adjusts the girth by rotation. The method involves obtaining a first degree of grinding at a first girth, controlling the adjusting shaft to rotate by a first angle to complete a coarse adjustment of the girth, and then obtaining a second degree of grinding at a second girth. Next, the method calculates the proportional relationship between the first angle and the difference between the first and second degrees of grinding, determines a second angle based on the proportional relationship and the target degree of grinding, and then controls the adjusting shaft to rotate by the second angle to complete a fine adjustment of the girth. Thus, this method, through two steps of coarse and fine adjustment, uses the relationship between the adjustment amount after coarse adjustment and the degree of grinding as the basis for fine adjustment, avoiding the influence of equipment hardware precision on the accuracy of girth adjustment. It can accurately and quickly achieve automatic girth adjustment, thereby ensuring the yield and quality of ground agricultural products.

[0035] Furthermore, the gap adjustment mechanism provided by the present invention is used in a grinding mill, the grinding mill including at least two rollers, and the gap adjustment mechanism including a power component, an adjustment shaft, an adjustment arm, and a control device; wherein, the adjustment shaft is connected to the power component via a transmission component and rotates under the drive of the power component; one end of the adjustment arm is axially slidably mounted on the adjustment shaft, and the other end of the adjustment arm is mounted on one of the two rollers so as to push the two rollers closer or further apart when the adjustment shaft rotates; the control device is used to control the power component to drive the adjustment shaft to rotate.

[0036] During operation, when the rolling gap needs to be reduced, the drive unit activates and rotates the adjusting shaft in the first direction, which in turn causes the adjusting arm to swing, bringing the two rolls closer together. When the rolling gap needs to be increased, the control device activates the drive unit and rotates the adjusting shaft in the second direction, which in turn causes the adjusting arm to swing in the opposite direction, moving the two rolls further apart. This rolling gap adjustment mechanism achieves automatic adjustment of the rolling gap. During adjustment, there is no need for the operator to manually rotate the robotic handwheel, reducing the operator's workload, increasing work efficiency, and ensuring the accuracy of the adjustment is not limited by the operator's experience, thus guaranteeing the yield and quality of agricultural product grinding. Attached Figure Description

[0037] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is one of the structural schematic diagrams of the rolling gap adjustment mechanism provided by the present invention;

[0039] Figure 2 This is a second schematic diagram of the rolling gap adjustment mechanism provided by the present invention;

[0040] Figure 3 This is the third schematic diagram of the rolling gap adjustment mechanism provided by the present invention;

[0041] Figure 4 This is the fourth schematic diagram of the rolling gap adjustment mechanism provided by the present invention;

[0042] Figure 5 This is the fifth schematic diagram of the rolling gap adjustment mechanism provided by the present invention;

[0043] Figure 6 This is one of the structural schematic diagrams of the screening equipment provided by the present invention;

[0044] Figure 7 This is a second schematic diagram of the structure of the screening equipment provided by the present invention;

[0045] Figure 8 This is one of the flowcharts for the rolling gap adjustment method provided by the present invention;

[0046] Figure 9 This is the second flowchart of the rolling gap adjustment method provided by the present invention.

[0047] Explanation of reference numerals in the attached figures:

[0048] 1-Motor, 2-Adjusting shaft, 3-Adjusting arm, 4-Drive belt, 5-Slider, 6-Pen-touch sensor;

[0049] 7-Roller, 8-Bag;

[0050] 101-Suction hopper, 102-Fixed container, 103-Screening disc, 104-Discharge bin, 105-Valve motor. Detailed Implementation

[0051] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0052] It should be noted that, in the absence of conflict, the following embodiments and features can be combined with each other; and, based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0053] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this disclosure, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0054] Please refer to Figures 1-5 In one specific embodiment, the roller gap adjustment mechanism provided by the present invention is used in a grinding mill, which includes at least two rollers 7. During operation, the grinding mill grinds crops such as wheat and corn through the movement of the two rollers 7. The roller gap adjustment mechanism includes a power component, an adjustment shaft 2, an adjustment arm 3, and a control device.

[0055] It should be understood that the degree of grinding refers to the scraping rate and the powder extraction rate. This roller gap adjustment method can be used for roller gap adjustment in the scraping rate detection disclosure or roller gap adjustment under the powder extraction rate detection condition. The scraping rate refers to the percentage of the weight of the material that passes through the coarse sieve after a certain grinding stage; the powder extraction rate refers to the percentage of the weight of the material that passes through the powder sieve after grinding in each grinding system. Its measurement and calculation methods are the same as those for the scraping rate.

[0056] The control device controls the power component to drive the adjusting shaft 2 to rotate clockwise or counterclockwise. The gap between the two rollers 7 is measured in real time, and the target gap value is set according to the type of agricultural product being ground and the intended use of the finished product. Specifically, the gap between the rollers 7 can be collected by a pen-touch sensor 6, which can be mounted on the adjusting shaft 2 or the adjusting arm 3. In practical applications, the gap is not limited to the pen-touch sensor 6; other sensors capable of measuring distance, such as photoelectric sensors, can also be used to collect the gap.

[0057] The power unit starts or stops in response to control commands from the control device. During startup, it drives the adjusting shaft 2 to rotate clockwise or counterclockwise by adjusting parameters such as working duration and power output direction. To facilitate precise control of the rolling gap and for automated control, the power unit is preferably a motor 1. Obviously, motor 1 is a reversible motor, specifically a stepper motor or a servo motor. Motor 1 starts and stops in response to the control commands, and its output shaft outputs a preset rotational stroke according to the control commands. A power-off brake is installed on motor 1 to stop its operation promptly when power is lost. Theoretically, any power unit capable of providing rotational power to the adjusting shaft 2 is sufficient; for example, a motor could also be used.

[0058] In specific application scenarios, taking stepper motor 1 as an example, when adjusting the rolling gap to bring the two rolls 7 closer together, stepper motor 1 receives a control command and enters the working state according to the start command, working time, and / or number of rotations carried by the preset strategy. The output shaft of stepper motor 1 rotates to drive the adjusting shaft 2 to rotate clockwise, and the adjusting arm 3 drives the roll 7 it is located to move closer to the other roll 7. Conversely, when adjusting the rolling gap to move the two rolls 7 further apart, stepper motor 1 receives a control command and enters the working state according to the start command, working time, and / or number of rotations carried by the preset strategy. The output shaft of stepper motor 1 rotates to drive the adjusting shaft 2 to rotate counterclockwise, and the adjusting arm 3 drives the roll it is located to move away from the other roll.

[0059] The aforementioned adjusting shaft 2 is connected to the power component via a transmission mechanism and rotates under the drive of the power component. Since the distance between the rollers 7 is variable, to avoid jamming during transmission and ensure transmission accuracy, the transmission mechanism is preferably a transmission belt 4. The transmission belt 4 cooperates with both the output shaft of the motor 1 and the adjusting shaft 2, enabling the adjusting shaft 2 to be connected to the motor 1. Specifically, the transmission belt 4 includes a first pulley, a second pulley, and a conveyor belt. The first pulley is mounted on the output shaft of the stepper motor 1 via bearings and rotates synchronously with the output shaft. The second pulley is mounted on the adjusting shaft 2 via bearings. When the first pulley rotates, the movement of the conveyor belt drives the second pulley to rotate, thereby driving the adjusting shaft 2 to rotate. Theoretically, if only avoiding jamming is considered, a transmission chain can also be used as the transmission mechanism.

[0060] One end of the adjusting arm 3 is axially slidably mounted on the adjusting shaft 2, and the other end of the adjusting arm 3 is mounted on one of the two rollers 7, so as to push the two rollers 7 closer or further apart when the adjusting shaft 2 rotates. Figure 5As shown, the adjusting arm 3 can be mounted on the adjusting shaft 2 via the slider 5, and the other end of the adjusting arm 3 can be fixed to one of the two rollers 7 via a flange. One end of the adjusting arm 3 is mounted on the slider 5, which is sleeved on the adjusting shaft 2. The slider 5 is threadedly engaged with the adjusting shaft 2 so that when the adjusting shaft 2 rotates, it drives the slider 5 to move axially, thereby causing the adjusting arm 3 to swing, thus adjusting the distance between the two rollers 7 by pushing and pulling.

[0061] In the above specific embodiments, the gap adjustment mechanism provided by the present invention is used in a grinding mill, the grinding mill including at least two rollers 7, and the gap adjustment mechanism including a power component, an adjustment shaft 2, an adjustment arm 3 and a control device; wherein, the adjustment shaft 2 is connected to the power component through a transmission component and rotates under the drive of the power component; one end of the adjustment arm 3 is axially slidably mounted on the adjustment shaft 2, and the other end of the adjustment arm 3 is mounted on one of the two rollers 7 so as to push the two rollers 7 closer or further apart when the adjustment shaft 2 rotates.

[0062] During operation, when the rolling gap needs to be adjusted closer, the control device drives the power unit to rotate the adjusting shaft 2 in the first direction, which in turn causes the adjusting arm 3 to swing, bringing the two rollers 7 closer together. When the rolling gap needs to be adjusted further apart, the control device drives the power unit to rotate the adjusting shaft 2 in the second direction, which in turn causes the adjusting arm 3 to swing in the opposite direction, moving the two rollers 7 further apart. In this way, the rolling gap adjustment mechanism achieves automatic adjustment of the rolling gap. During the adjustment process, there is no need for the operator to manually rotate the mechanical handwheel, reducing the operator's workload, improving work efficiency, and ensuring that the adjustment result is not limited by the operator's experience, resulting in a high accuracy rate of rolling gap adjustment, thus guaranteeing the yield and quality of agricultural product grinding.

[0063] In addition to the aforementioned roller gap adjustment mechanism, the present invention also provides a grinding mill including the roller gap adjustment mechanism, which further includes a hopper 8 and a screening device. The hopper 8 is equipped with at least two rollers 7 and the roller gap adjustment mechanism as described above. The feed inlet of the screening device is connected to the discharge outlet of the hopper 8. The screening device is signal-connected to the control device of the roller gap adjustment mechanism and feeds back the calculated scraping rate to the control device. The screening device can automatically screen the ground material and automatically calculate the scraping rate.

[0064] Specifically, such as Figure 6 and Figure 7As shown, the screening equipment includes a suction hopper 101 connected to the discharge port of the aforementioned silo, a fixed container 102, a screening disc 103, and a discharge bin 104. The fixed container has a valve, which is opened and closed under the control of a valve motor 105. It should be understood that the screening equipment can achieve automatic material screening and automatic calculation of the scraping rate. Its specific working principle is the same as existing technology and will not be elaborated further. After grinding is complete, the valve of the fixed container closes, the pneumatic hopper operates, and material is taken from the pipe between the silo and the suction hopper. After material removal is completed, the valve of the fixed container opens to discharge the material. Then, the vent valve is opened and the valve of the suction hopper is closed. The blower starts and sucks the material into the suction hopper. After running for a preset time (e.g., 40 seconds), the blower and vent valve are turned off. After feeding is complete, the screening is started, and the valve of the suction hopper is opened simultaneously to put the material into the screening disc for screening. After screening, the scraping rate is calculated, and this scraping rate can be transmitted to the control device mentioned above as reference data for adjusting the rolling gap. In addition to the technical effects of the above-mentioned rolling gap adjustment mechanism, this grinding mill can also automatically calculate the scraping rate through the screening equipment, thus providing data support for fine adjustment of the rolling gap.

[0065] Based on the above-mentioned grinding mill, the present invention also provides a method for adjusting the rolling gap, such as... Figure 8 As shown, taking the roll gap adjustment in a stripping rate detection scenario as an example, the method includes the following steps:

[0066] S810: Obtain the first scraping rate under the first rolling gap; the first rolling gap can be acquired by using a pen-touch sensor, and the first scraping rate is calculated by using screening equipment under the state of the first rolling gap.

[0067] S820: Control the adjustment shaft to rotate by a first angle to complete the coarse adjustment of the rolling gap, and obtain the second scraping rate under the second rolling gap; the second rolling gap can also be obtained by using a pen-touch sensor, that is, after the adjustment shaft rotates by the first angle, the rolling gap is obtained again, and the rolling gap is the second rolling gap. Then, under the state of the second rolling gap, the scraping rate is calculated again by the screening equipment, and the scraping rate at this time is the second scraping rate.

[0068] S830: Calculate the proportional relationship between the first angle and the difference between the second and first peeling rates.

[0069] S840: Determine the second angle based on the aforementioned proportional relationship and the target scraping rate; for example, assuming the target scraping rate is 42%, the initial value of the first scraping rate is 36%, the rotation angle of the adjusting shaft is set to 60°, and the rolling gap is coarsely adjusted accordingly. After the rolling gap is coarsely adjusted, the scraping rate obtained is 40%. Then the correspondence between the rotation angle and the change in the scraping rate can be calculated. When the rolling gap is finely adjusted, the rotation angle of the adjusting shaft (i.e., the second angle) during fine adjustment can be determined to be [60° / (40%-36%)]*(42%-40%).

[0070] S850: Controls the adjustment shaft to rotate at the second angle to complete the fine adjustment of the rolling gap.

[0071] To avoid excessive adjustment of the rolling gap, the method also includes a rolling gap monitoring step, specifically:

[0072] When the rolling gap reaches the maximum threshold, the rotation in the direction that increases the rolling gap by adjusting the axial direction is locked.

[0073] When the rolling gap reaches the minimum threshold, the rotation in the direction that adjusts the axial direction to reduce the rolling gap is locked.

[0074] Furthermore, in order to improve the accuracy of obtaining the scraping rate, a large amount of data (e.g., 1000 numbers) can be read within a certain period of time, and then extreme values ​​can be removed, and the median can be taken from the remaining numbers.

[0075] like Figure 9 As shown, obtaining the peeling rate specifically includes the following steps:

[0076] S910: Continuously acquire multiple peeling rate values ​​within a preset time period;

[0077] S920: Remove the maximum and minimum values ​​from the plurality of peeling rate values;

[0078] S930: Take the median of the remaining scraping rate values ​​as the desired scraping rate.

[0079] Understandably, when applied to the determination of powder extraction rate, the above-mentioned peeling rate can be replaced with powder extraction rate.

[0080] In addition to the technical effects of the aforementioned rolling gap adjustment mechanism, the rolling gap adjustment method provided by this invention uses a two-step adjustment process of coarse and fine adjustment. The relationship between the adjustment amount after coarse adjustment and the peeling rate is used as the basis for fine adjustment, which avoids the influence of the equipment hardware precision on the rolling gap adjustment precision and can achieve automatic rolling gap adjustment more accurately and quickly.

[0081] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for adjusting the gap in a grinding mill, the grinding mill comprising at least two rollers and an adjusting shaft for adjusting the gap by rotation, characterized in that, The method includes: Obtain the first grinding degree under the first rolling gap; The adjustment shaft is rotated by a first angle to complete the rough adjustment of the rolling gap and to obtain the second grinding degree under the second rolling gap; Calculate the proportional relationship between the first angle and the difference between the second and first grinding degrees; The second angle is determined based on the aforementioned proportional relationship and the target degree of grinding. The rolling gap is finely adjusted by controlling the rotation of the adjusting shaft to a second angle. When the rolling gap reaches the maximum threshold, the rotation in the direction that increases the rolling gap by adjusting the axial direction is locked. When the rolling gap reaches the minimum threshold, the rotation in the direction of adjusting the axial direction to reduce the rolling gap is locked. Among them, the degree of grinding refers to the scraping rate and the powder extraction rate.

2. The rolling gap adjustment method according to claim 1, characterized in that, The degree of grinding is obtained by: Within a preset time period, multiple grinding degree values ​​are continuously acquired; Remove the maximum and minimum values ​​from the multiple grinding degree values; Take the median of the remaining abrasion levels as the desired abrasion level.

Images