Method for feed rate control of a crushing system and crushing system

Abstract

The application relates to the technical field of crushers, and provides a feeding speed control method for a crushing system and the crushing system, wherein the crushing system comprises a crusher and a feeding device, the feeding speed control method for the crushing system comprises the following steps: acquiring working parameters of a crushing chamber, the working parameters of the crushing chamber comprising a material level height in the crushing chamber and a material level change speed in the crushing chamber; acquiring a feeding state of the feeding device, the feeding state of the feeding device at least comprising a material height on the feeding device; and controlling a feeding speed of the feeding device according to the working parameters of the crushing chamber and the feeding state of the feeding device. In this way, the material level height and the material level change speed in the crushing chamber are direct and intuitive parameters for representing the working condition of the crusher, and the feeding speed can be adjusted in time and effectively in combination with the feeding state of the feeding device, so that the problem that the feeding speed of the feeding device cannot be controlled in time according to the working current of the crusher in the prior art is solved.

Description

Technical Field

[0001] This invention relates to the field of crusher technology, and in particular to a method for controlling the feeding speed of a crushing system and a crushing system. Background Technology

[0002] A crusher is a machine used to break large materials (such as rocks, ores, concrete, etc.) into smaller particles. It has a feeding device at the front to transport the material into the crusher. Automatic feeding can be achieved by controlling the feeding device. When feeding material into the crusher, the feeding speed needs to be controlled to ensure an appropriate amount of material in the crusher, allowing for continuous crushing without overloading.

[0003] In existing technologies, the main focus is on detecting the crusher's operating current and controlling the feeding speed of the feeding equipment based on this current. However, the crusher's operating current response is lag-dependent. When the crusher's operating current changes little or becomes excessively high, blockages may have already occurred, resulting in insufficient and untimely control of the feeding speed, which affects production efficiency and cycle time.

[0004] Therefore, how to solve the problem of insufficient timeliness in controlling the feeding speed of the feeding device based on the working current of the crusher in the existing technology has become an important technical problem to be solved by those skilled in the art. Summary of the Invention

[0005] This invention provides a feeding speed control method and a crushing system for a crushing system, which solves the defect in the prior art that the feeding speed of the feeding device is not timely enough when controlling it according to the working current of the crusher.

[0006] This invention provides a method for controlling the feeding speed of a crushing system, the crushing system including a crusher and a feeding device for feeding material into the crushing chamber of the crusher, the method for controlling the feeding speed of the crushing system including:

[0007] The operating parameters of the crushing chamber are obtained, including the material level height and the rate of change of the material level in the crushing chamber.

[0008] The material receiving status of the feeding device is obtained, and the material receiving status of the feeding device includes at least the material height on the feeding device;

[0009] The feeding speed of the feeding device is controlled according to the working parameters of the crushing chamber and the material receiving status of the feeding device.

[0010] According to the present invention, a method for controlling the feed rate of a crushing system, wherein obtaining the operating parameters of the crushing chamber includes:

[0011] Obtain the remaining space height of the crushing chamber, where the remaining space height of the crushing chamber is the distance between the material surface inside the crushing chamber and the reference surface;

[0012] The material level in the crushing chamber is determined based on the height of the reference plane and the remaining space height of the crushing chamber.

[0013] The rate of change of material level in the crushing chamber is determined based on the current material level height in the crushing chamber and the material level height in the crushing chamber at the previous moment.

[0014] According to a feeding rate control method for a crushing system provided by the present invention, obtaining the remaining space height of the crushing chamber includes:

[0015] Obtain the remaining space height corresponding to at least two first detection positions within the crushing chamber, with each first detection position distributed circumferentially along the internal space of the crushing chamber;

[0016] The remaining space height of the crushing chamber is determined by using a weighted average method based on the remaining space height corresponding to each of the first detection positions.

[0017] According to the present invention, a feeding speed control method for a crushing system is provided, wherein the material height on the feeding device is the material height at the feeding end of the feeding device, and the step of obtaining the material arrival status of the feeding device includes:

[0018] The height of the material at the end of the feeding device closest to the crusher is obtained.

[0019] According to the present invention, a method for controlling the feeding speed of a crushing system, wherein controlling the feeding speed of the feeding device based on the operating parameters of the crushing chamber and the material receiving state of the feeding device includes:

[0020] Based on the material level change rate in the crushing bin, the material level height in the crushing bin, the feeding height of the feeding device, and the first speed control model of the feeding device, the adjustment ratio of the feeding speed of the feeding device is determined. The first speed control model of the feeding device includes the material level change rate in the crushing bin, the preset speed, the material level height in the crushing bin, the preset height, the feeding height of the feeding device, the preset height range, and the adjustment ratio of the feeding speed of the feeding device.

[0021] The feeding speed of the feeding device is controlled according to the adjustment ratio of the feeding speed of the feeding device.

[0022] According to the feeding speed control method for a crushing system provided by the present invention, the material arrival status of the feeding device further includes the trend of material height change on the feeding device, and the step of obtaining the material arrival status of the feeding device includes:

[0023] The material height corresponding to at least two second detection positions on the feeding device is obtained, and each of the second detection positions is distributed at intervals along the feeding direction of the feeding device.

[0024] The trend of material height change on the feeding device is determined based on the material height corresponding to each of the second detection positions.

[0025] According to the present invention, a method for controlling the feeding speed of a crushing system, wherein controlling the feeding speed of the feeding device based on the operating parameters of the crushing chamber and the material receiving state of the feeding device includes:

[0026] Based on the material level change rate in the crushing chamber, the material level height in the crushing chamber, the material height change trend on the feeding device, and the second speed control model of the feeding device, the adjustment ratio of the feeding speed of the feeding device is determined. The second speed control model of the feeding device includes the material level change rate in the crushing chamber, a preset speed range, the material level height in the crushing chamber, a preset height range, the material height change trend on the feeding device, and the adjustment ratio of the feeding speed of the feeding device.

[0027] The feeding speed of the feeding device is controlled according to the adjustment ratio of the feeding speed of the feeding device.

[0028] According to the present invention, a method for controlling the feeding speed of a crushing system further includes:

[0029] Obtain the physical parameters of the material, which include at least the particle size, hardness, and mud content of the material.

[0030] The adjustment ratio of the feeding speed of the feeding device is determined based on the physical parameters of the material.

[0031] According to the present invention, a method for controlling the feeding speed of a crushing system is provided, wherein the operating parameters of the crushing chamber further include the operating current of the crushing chamber, and the method for controlling the feeding speed of the crushing system further includes:

[0032] Obtain the operating current of the crushing chamber;

[0033] When the operating current of the crushing chamber is greater than the limit current, the feeding speed of the feeding device is reduced.

[0034] The present invention also provides a crushing system, including a controller, the controller being capable of executing the feeding speed control method for the crushing system as described above.

[0035] The feeding speed control method for a crushing system provided by this invention includes a crusher and a feeding device, which feeds material into the crushing chamber of the crusher. The feeding speed control method requires acquiring the operating parameters of the crushing chamber and the material arrival status of the feeding device. The operating parameters of the crushing chamber include the material level height and the rate of change of the material level within the crushing chamber. The material arrival status of the feeding device includes at least the material height on the feeding device. Then, the feeding speed of the feeding device is controlled based on the operating parameters of the crushing chamber and the material arrival status of the feeding device. In other words, the feeding speed control method for a crushing system provided by this invention mainly controls the feeding speed of the feeding device based on the material level height within the crushing chamber, the rate of change of the material level within the crushing chamber, and the material arrival status of the feeding device. Among them, the material level height and the rate of change of material level in the crushing chamber are direct and intuitive parameters that indicate the working condition of the crusher. Combined with the material receiving status of the feeding equipment, the feeding speed of the feeding equipment can be adjusted in a timely and effective manner to avoid the problem of blockage in the crusher, ensure production efficiency and production cycle, and solve the problem of insufficient control timeliness when controlling the feeding speed of the feeding equipment based on the working current of the crusher in the existing technology. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0037] Figure 1 This is a flowchart of the feeding speed control method for a crushing system provided by the present invention;

[0038] Figure 2 This is a schematic diagram of the crushing system provided by the present invention;

[0039] Figure 3 This is a schematic diagram showing the distribution of the first detection element provided by the present invention within the crushing chamber;

[0040] Figure 4 This is a schematic diagram of the crushing system provided by the present invention when the rate of material level change in the crushing chamber is relatively small;

[0041] Figure 5 This is a schematic diagram of the crushing system provided by the present invention when the material level changes rapidly within the crushing chamber.

[0042] Figure label:

[0043] 1. Crusher; 2. Crushing chamber; 3. Feeding equipment; 4. Fourth proximity switch; 5. Fifth proximity switch; 6. Sixth proximity switch; 7. First detection element. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0045] The following is combined Figures 1 to 5 The present invention describes a method for controlling the feed rate of a crushing system.

[0046] like Figure 1 and Figure 5 As shown, the feeding speed control method for a crushing system provided in this embodiment of the invention can be executed by the controller of the crushing system or other independent control devices.

[0047] The feeding speed control method for the crushing system in this embodiment mainly includes the following steps:

[0048] Step 110: Obtain the operating parameters of the crushing chamber, including the material level height and the rate of change of the material level in the crushing chamber.

[0049] Step 120: Obtain the material arrival status of the feeding device. The material arrival status of the feeding device includes at least the material height on the feeding device.

[0050] Step 130: Control the feeding speed of the feeding equipment according to the working parameters of the crushing chamber and the material receiving status of the feeding equipment.

[0051] Specifically, the crushing system includes a crusher 1 and a feeding device 3. The crusher 1 has a crushing chamber 2. After the material enters the crushing chamber 2 of the crusher 1, the crusher 1 can crush the material. The feeding device 3 is used to feed material into the crushing chamber 2 of the crusher 1, that is, the feeding device 3 is used to transport the material to the crushing chamber 2 of the crusher 1.

[0052] In this embodiment, the crusher 1 may be, but is not limited to, a jaw crusher; the feeding device 3 in this embodiment may be, but is not limited to, a belt conveyor, a vibrating feeder, etc.

[0053] In the feeding speed control method for the crushing system provided in this embodiment, it is necessary to first obtain the working parameters of the crushing chamber 2 and the material arrival status of the feeding device 3. The working parameters of the crushing chamber 2 include the material level height in the crushing chamber 2 and the material level change rate in the crushing chamber 2. The material arrival status of the feeding device 3 includes at least the material height on the feeding device 3.

[0054] Then, based on the working parameters of the crushing chamber 2 and the material status of the feeding device 3, the feeding speed of the feeding device 3 is controlled.

[0055] In other words, the feeding speed control method for the crushing system provided in this embodiment of the invention mainly controls the feeding speed of the feeding device 3 based on the material level height in the crushing chamber 2, the material level change rate in the crushing chamber 2, and the material arrival status on the feeding device 3.

[0056] Among them, the material level height and the material level change rate in the crushing chamber 2 are direct and intuitive parameters representing the working condition of the crusher 1. Combined with the material receiving status of the feeding device 3, the feeding speed of the feeding device 3 can be adjusted in a timely and effective manner to avoid the problem of blockage in the crusher 1, ensure production efficiency and production cycle, and solve the problem of insufficient control time when controlling the feeding speed of the feeding device 3 based on the working current of the crusher 1 in the existing technology.

[0057] In this embodiment of the invention, for the working parameters of the crushing chamber 2, it is necessary to first determine the material level height in the crushing chamber 2, and then determine the material level change rate in the crushing chamber 2 based on the material level height in the crushing chamber 2.

[0058] Specifically, a reference plane is selected at a position near the top of the crushing chamber 2, and the space between the material surface and the reference plane inside the crushing chamber 2 is called the remaining space of the crushing chamber 2.

[0059] First, obtain the remaining space height of crushing chamber 2. Then, based on the height of the reference plane and the remaining space height of crushing chamber 2, the height of the material surface in crushing chamber 2 can be determined, which is the material level height inside crushing chamber 2.

[0060] The rate of change of material level in crushing chamber 2, which is the rate of change of material level within crushing chamber 2, needs to be calculated and determined based on the material level height within crushing chamber 2 at two adjacent moments.

[0061] When obtaining the remaining space height of the crushing chamber 2, a first detection element 7, such as an ultrasonic distance sensor, can be set at the reference surface of the crushing chamber 2. The ultrasonic distance sensor can be used to directly detect the distance between the reference surface and the material surface inside the crushing chamber 2.

[0062] On the reference surface of crushing chamber 2, the position used to detect the distance between the reference surface and the material surface inside crushing chamber 2 is called the first detection position.

[0063] In this embodiment, at least two first detection positions are selected on the reference surface inside the crushing chamber 2, and these first detection positions are distributed circumferentially along the internal space of the crushing chamber 2. A corresponding ultrasonic distance sensor is installed at each first detection position. By using multiple ultrasonic distance sensors, the distance between multiple positions on the reference surface of the crushing chamber 2 and the material surface inside the crushing chamber 2 can be detected, thereby obtaining multiple remaining space heights.

[0064] In some cases, the detected heights of multiple remaining spaces show a certain degree of consistency, indicating that the material surface within crushing chamber 2 is relatively flat. Along the circumference of the internal space of crushing chamber 2, the material distribution at each location is relatively even, and the crushing velocity at each location is approximately uniform.

[0065] In other cases, the consistency of the detected remaining space heights was poor, indicating that the material surface in crushing chamber 2 had significant undulations. The crushing speed was slower in some areas and faster in others within crushing chamber 2, with considerable differences between the crushing speeds at different locations.

[0066] In this embodiment, based on the importance of each location to the crushing operation, the remaining space height of each location is assigned a corresponding weight. Then, a weighted average method is used to calculate and determine the remaining space height of the crushing chamber 2. The remaining space height of the crushing chamber 2 determined in this way is more realistic, making the control of the feeding speed of the feeding device 3 more precise.

[0067] In this embodiment of the invention, the height of the material at the feeding end of the feeding device 3 can be regarded as the material height on the feeding device 3, also known as the feeding height of the feeding device 3. The feeding end of the feeding device 3 is the end of the feeding device 3 that is close to the crusher 1.

[0068] Accordingly, by obtaining the height of the material at the feeding end of the feeding device 3, the material height on the feeding device 3 can be obtained, which is the material receiving status of the feeding device 3.

[0069] At this time, an ultrasonic distance sensor or proximity switch or other second detection element can be installed above the feeding end of the feeding device 3. The feeding height of the feeding device 3 can be detected by the second detection element.

[0070] When using an ultrasonic distance sensor as the second detection element, only one ultrasonic distance sensor can be set, and the height of the material detected by it is H2. When H2 is greater than the upper limit of the preset height range, it indicates that the feeding height of the feeding device 3 is large and the amount of material at the feeding end of the feeding device 3 is large; when H2 is within the preset height range, it indicates that the feeding height of the feeding device 3 is moderate and the amount of material at the feeding end of the feeding device 3 is moderate; when H2 is less than the lower limit of the preset height range, it indicates that the feeding height of the feeding device 3 is small and the amount of material at the feeding end of the feeding device 3 is small.

[0071] When using proximity switches as the second detection element, three proximity switches can be set, namely, a first proximity switch, a second proximity switch, and a third proximity switch with progressively increasing heights. When only the first proximity switch is triggered, it indicates that the feeding height of the feeding device 3 is small and the amount of material at the feeding end of the feeding device 3 is small; when the second proximity switch is triggered and the third proximity switch is not triggered, it indicates that the feeding height of the feeding device 3 is moderate and the amount of material at the feeding end of the feeding device 3 is moderate; when the third proximity switch is triggered, it indicates that the feeding height of the feeding device 3 is large and the amount of material at the feeding end of the feeding device 3 is large.

[0072] At this point, when controlling the feeding speed of the feeding device 3 based on the working parameters of the crushing chamber 2 and the incoming material status of the feeding device 3, it is necessary to first determine the adjustment ratio of the feeding speed of the feeding device 3 based on the material level change rate of the crushing chamber 2, the material level height in the crushing chamber 2, the feeding height of the feeding device 3, and the first speed control model of the feeding device 3. Then, the feeding speed of the feeding device 3 is controlled based on the adjustment ratio of the feeding speed of the feeding device 3.

[0073] Specifically, the first speed control model of the feeding device 3 includes the material level change rate in the crushing chamber 2, the preset speed, the material level height in the crushing chamber 2, the preset height, the feeding height of the feeding device 3, the preset height range, and the adjustment ratio of the feeding speed of the feeding device 3. The first speed control model of the feeding device 3 is obtained after training based on samples of the material level change rate in the crushing chamber 2, the preset speed, the material level height in the crushing chamber 2, the preset height, the feeding height of the feeding device 3, the preset height range, and the adjustment ratio of the feeding speed of the feeding device 3. It can be understood as a function, with the input being the material level change rate in the crushing chamber 2 at the current moment, the material level height in the crushing chamber 2, and the feeding height of the feeding device 3, and the output being the adjustment ratio of the feeding speed of the feeding device 3.

[0074] After obtaining the current material level change rate, material level height in crushing chamber 2, and feeding height of feeding device 3, these are input into the pre-trained first speed control model. The first speed control model then performs internal calculations based on the current material level change rate, material level height in crushing chamber 2, and feeding height of feeding device 3 to obtain the adjustment ratio of the feeding speed of feeding device 3 at the current moment, corresponding to the current material level change rate, material level height in crushing chamber 2, and feeding height of feeding device 3.

[0075] In a specific embodiment, when the material level in the crushing chamber 2 is greater than the preset height and the material level change rate in the crushing chamber 2 is greater than the preset speed, if the feeding height of the feeding device 3 is less than the lower limit of the preset height range, the feeding device 3 can be controlled to feed continuously and maintain the same feeding speed as the previous moment; if the feeding height of the feeding device 3 is within the preset height range, the feeding device 3 can be controlled to reduce the feeding speed, such as reducing the feeding speed to a% of the feeding speed of the previous moment; if the feeding height of the feeding device 3 is greater than the upper limit of the preset height range, the feeding device 3 can be controlled to stop feeding.

[0076] When the material level in crushing chamber 2 is greater than the preset height and the material level change rate in crushing chamber 2 is less than the preset speed, if the feeding height of feeding device 3 is less than the lower limit of the preset height range, feeding device 3 can be controlled to reduce the feeding speed, such as reducing the feeding speed to b% of the feeding speed at the previous moment; if the feeding height of feeding device 3 is greater than the lower limit of the preset height range, that is, the feeding height of feeding device 3 is within the preset height range or the feeding height of feeding device 3 is greater than the upper limit of the preset height range, feeding device 3 can be controlled to stop feeding.

[0077] When the material level in crushing chamber 2 is less than the preset height, and the material level change rate in crushing chamber 2 is greater than the preset speed, if the feeding height of feeding device 3 is less than the upper limit of the preset height range (i.e., less than the lower limit of the preset height range) or the feeding height of feeding device 3 is within the preset height range, feeding device 3 can be controlled to feed continuously and maintain the same feeding speed as the previous moment; if the feeding height of feeding device 3 is greater than the upper limit of the preset height range, feeding device 3 can be controlled to reduce the feeding speed, such as reducing the feeding speed to c% of the feeding speed of the previous moment.

[0078] When the material level in the crushing chamber 2 is less than the preset height, and the rate of change of the material level in the crushing chamber 2 is greater than the preset rate, if the feeding height of the feeding device 3 is less than the lower limit of the preset height range, the feeding device 3 can be controlled to feed continuously and maintain the same feeding speed as the previous moment; if the feeding height of the feeding device 3 is within the preset height range, the feeding device 3 can be controlled to reduce the feeding speed, such as reducing the feeding speed to d% of the feeding speed of the previous moment; if the feeding height of the feeding device 3 is greater than the upper limit of the preset height range, the feeding device 3 can be controlled to stop feeding.

[0079] It should be noted that among a, b, c, and d above, there may be at least two equal numbers, or there may be unequal numbers; this application does not impose any limitation.

[0080] In this embodiment of the invention, the feeding state of the feeding device 3 also includes the trend of material height change on the feeding device 3. That is, it is necessary to determine the height of the material at different positions (called the second detection positions) on the feeding device 3 along the feeding direction. Each second detection position is distributed at intervals on the feeding device 3 along the feeding direction.

[0081] At this time, when obtaining the material arrival status of the feeding device 3, it is necessary to first obtain the material height corresponding to at least two second detection positions on the feeding device 3, and then determine the material height change trend on the feeding device 3 based on the material height corresponding to each second detection position.

[0082] At this time, an ultrasonic distance sensor or a proximity switch or other third detection element can be installed above the feeding device 3. Multiple third detection elements can be installed and distributed at intervals along the feeding direction.

[0083] When using ultrasonic distance sensors as the third detection element, the trend of material height change on the feeding device 3 can be determined based on the material height detected by each ultrasonic distance sensor.

[0084] When proximity switches are used as the third detection element, each proximity switch is equidistant from the conveying surface of the feeding device 3. The material height change trend on the feeding device 3 is determined based on the triggering status of each proximity switch.

[0085] For example, three proximity switches are installed above the feeding device 3, namely the fourth proximity switch 4, the fifth proximity switch 5, and the sixth proximity switch 6, which are located in the direction close to the crusher 1.

[0086] The material height variation trend on feeding device 3 can be categorized into the following situations:

[0087] Only the sixth proximity switch 6 is triggered, while the fourth proximity switch 4 and the fifth proximity switch 5 are not triggered. At this time, the material height change trend on the feeding device 3 is called trend one.

[0088] When the fifth proximity switch 5 and the sixth proximity switch 6 are triggered, while the fourth proximity switch 4 is not triggered, the material height change trend on the feeding device 3 at this time is called trend two.

[0089] When the fourth proximity switch 4 and the sixth proximity switch 6 are triggered, while the fifth proximity switch 5 is not triggered, the material height change trend on the feeding device 3 at this time is called trend three.

[0090] When the fourth proximity switch 4, the fifth proximity switch 5, and the sixth proximity switch 6 are all triggered, the material height change trend on the feeding device 3 is called trend four.

[0091] Only the fifth proximity switch 5 is triggered, while the fourth proximity switch 4 and the sixth proximity switch 6 are not triggered. At this time, the material height change trend on the feeding device 3 is called trend five.

[0092] The fourth proximity switch 4 and the fifth proximity switch 5 are triggered, while only the sixth proximity switch 6 is not triggered. At this time, the material height change trend on the feeding device 3 is called trend six.

[0093] Only the fourth proximity switch 4 is triggered, while the fifth proximity switch 5 and the sixth proximity switch 6 are not triggered. At this time, the material height change trend on the feeding device 3 is called trend seven.

[0094] In this embodiment, when controlling the feeding speed of the feeding device 3 based on the working parameters of the crushing chamber 2 and the incoming material status of the feeding device 3, it is necessary to first determine the adjustment ratio of the feeding speed of the feeding device 3 based on the material level change rate of the crushing chamber 2, the material level height in the crushing chamber 2, the material height change trend on the feeding device 3, and the second speed control model of the feeding device 3. Then, the feeding speed of the feeding device 3 is controlled according to the adjustment ratio of the feeding speed of the feeding device 3.

[0095] Specifically, the second speed control model of the feeding device 3 includes the material level change rate in the crushing chamber 2, the preset speed range, the material level height in the crushing chamber 2, the preset height range, the material height change trend on the feeding device 3, and the adjustment ratio of the feeding speed of the feeding device 3. The second speed control model of the feeding device 3 is obtained after training based on samples of the material level change rate in the crushing chamber 2, the preset speed range, the material level height in the crushing chamber 2, the preset height range, the material height change trend on the feeding device 3, and the adjustment ratio of the feeding speed of the feeding device 3. It can be understood as a function, with the input being the current material level change rate in the crushing chamber 2, the preset speed range, the material level height in the crushing chamber 2, the preset height range, and the material height change trend on the feeding device 3, and the output being the adjustment ratio of the feeding speed of the feeding device 3.

[0096] After obtaining the current material level change rate, preset speed range, material level height, preset height range, and material height change trend on the feeding device 3, these are input into the pre-trained second speed control model. The second speed control model then performs internal calculations based on these data to obtain the adjustment ratio of the feeding speed of the feeding device 3 at the current moment, corresponding to these data.

[0097] In a specific embodiment, the influence of the material level in the crushing chamber 2 on the feeding speed of the feeding device 3, the influence of the material level change rate in the crushing chamber 2 on the feeding speed of the feeding device 3, and the influence of the material height change trend on the feeding device 3 on the operating status of the crusher 1 can be determined based on the material level height in the crushing chamber 2, the material level change rate in the crushing chamber 2 on the feeding speed of the feeding device 3, and the influence of the material height change trend on the feeding device 3 on the feeding speed of the feeding device 3.

[0098] Specifically, the rated feeding speed of the feeding device 3 is set to V0.

[0099] When the material level in the crushing chamber 2 is greater than the upper limit of the preset height range, the ratio of the feeding speed of the feeding device 3 to the rated feeding speed should be K1 = 50%; when the material level in the crushing chamber 2 is within the preset height range, the ratio of the feeding speed of the feeding device 3 to the rated feeding speed should be K1 = 70%; when the material level in the crushing chamber 2 is less than the lower limit of the preset height range, the ratio of the feeding speed of the feeding device 3 to the rated feeding speed should be K1 = 100%.

[0100] When the rate of change of material level in crushing chamber 2 exceeds the upper limit of the preset speed range, the ratio of the feeding speed of feeding device 3 to the rated feeding speed should be K2 = 100%; when the rate of change of material level in crushing chamber 2 is within the preset speed range, the ratio of the feeding speed of feeding device 3 to the rated feeding speed should be K2 = 70%; and when the rate of change of material level in crushing chamber 2 is within the preset speed range, the ratio of the feeding speed of feeding device 3 to the rated feeding speed should be K2 = 50%.

[0101] When the material height change trend on feeding device 3 is trend one, the ratio of the feeding speed of feeding device 3 to the rated feeding speed needs to be K3 = 90%; when the material height change trend on feeding device 3 is trend two, the ratio of the feeding speed of feeding device 3 to the rated feeding speed needs to be K3 = 70%; when the material height change trend on feeding device 3 is trend three, the ratio of the feeding speed of feeding device 3 to the rated feeding speed needs to be K3 = 80%; when the material height change trend on feeding device 3 is trend four, the ratio of the feeding speed needs to be K3 = 90%; when the material height change trend on feeding device 3 is trend four, the ratio of the feeding speed needs to be K3 = 90%; when the material height change trend on feeding device 3 is trend four, the ratio of the feeding speed needs to be K3 = 90%; when the material height change trend on feeding device 3 is trend three, the ratio of the feeding speed needs to be K3 = 90%; when the material height change trend on feeding device 3 is trend four ... The ratio of the feeding speed of device 3 to the rated feeding speed is K3 = 50%; when the material height change trend on feeding device 3 is trend five, the ratio of the feeding speed of feeding device 3 to the rated feeding speed needs to be K3 = 85%; when the material height change trend on feeding device 3 is trend six, the ratio of the feeding speed of feeding device 3 to the rated feeding speed needs to be K3 = 75%; when the material height change trend on feeding device 3 is trend seven, the ratio of the feeding speed of feeding device 3 to the rated feeding speed needs to be K3 = 100%.

[0102] Based on the above, the feeding speed of the feeding device 3 at the current moment can be controlled as V = V0 × K1 × K2 × K3.

[0103] When the material level in the crushing chamber 2 is high or the material level change rate in the crushing chamber 2 is low, if the material height change trend on the feeding device 3 is trend one, trend two, driving three, trend five or trend seven, the feeding speed of the feeding device 3 can be appropriately reduced to enable the crusher 1 to continue crushing and continuously discharge material. If the material height change trend on the feeding device 3 is trend four or trend six, the feeding speed can be adjusted or feeding can be stopped before the material level in the crushing chamber 2 drops to the limit value of the preset height range, so that the crusher 1 can continue crushing and continuously discharge material.

[0104] In the feeding speed control method for a crushing system provided in this embodiment of the invention, the physical parameters of the material can also be obtained, and the adjustment ratio of the feeding speed of the feeding device 3 can be determined based on the physical parameters of the material.

[0105] The physical parameters of the material include at least the particle size, hardness, and mud content. These physical parameters affect the crushing speed of the crusher 1. When the particle size or hardness of the material is large, the crushing speed of the crusher 1 will be relatively low. When the particle size or hardness of the material is small, the crushing speed of the crusher 1 will be relatively high.

[0106] Therefore, when controlling the feeding speed of the feeding device 3 based on the material level height in the crushing chamber 2, the rate of change of the material level in the crushing chamber 2, and the incoming material status on the feeding device 3, the feeding speed of the feeding device 3 can be adjusted by a corresponding adjustment ratio in combination with the physical parameters of the material. This can further ensure that the feeding speed of the feeding device 3 is compatible with the working condition of the crusher 1, making the adjustment of the feeding speed of the feeding device 3 more accurate and timely.

[0107] A human-machine interface can be set up so that the physical parameters of the material can be obtained by manual input and control system before the crusher 1 starts working.

[0108] The operating parameters of the crushing chamber 2 mentioned above also include the operating current of the crushing chamber 2. The operating current of the crusher 1 can reflect the load condition of the crusher 1 to a certain extent. When the load on the crusher 1 is too large, the operating current of the crusher 1 will gradually increase.

[0109] In this embodiment, the feeding speed control method for the crushing system further includes obtaining the operating current of the crushing chamber 2 and comparing the operating current of the crushing chamber 2 with the limit current. When the operating current of the crushing chamber 2 is greater than the limit current, the feeding speed of the feeding device 3 will be reduced to avoid the crusher 1 from being overloaded and shutting down, thus ensuring the continuous operation of the crusher 1.

[0110] In summary, the feeding speed control method for a crushing system provided by the embodiments of the present invention requires a simple device structure and uses multiple area material level detection for feeding control linkage, which can minimize the frequent start-stop caused by existing control methods, as well as the problems of premature or late stop time and late start time caused by system lag, improve the appropriate use of crusher 1, and enhance production efficiency.

[0111] On the other hand, based on the same general inventive concept, embodiments of the present invention also provide a crushing system, including a controller, which is capable of executing the feeding speed control method for the crushing system provided in any of the above embodiments, and has all the advantages of the feeding speed control method for the crushing system described above. The derivation process of the beneficial effects of the crushing system in the embodiments of the present invention is largely similar to the derivation process of the beneficial effects of the feeding speed control method for the crushing system described above, and therefore will not be repeated here.

[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for controlling the feeding speed in a crushing system, characterized in that, The crushing system includes a crusher and a feeding device for feeding material into the crushing chamber of the crusher. The feeding speed control method for the crushing system includes: The operating parameters of the crushing chamber are obtained, including the material level height and the rate of change of the material level in the crushing chamber. The material receiving status of the feeding device is obtained, and the material receiving status of the feeding device includes at least the material height on the feeding device; The feeding speed of the feeding device is controlled according to the working parameters of the crushing chamber and the material receiving status of the feeding device. The material receiving status of the feeding device also includes the trend of material height change on the feeding device. Controlling the feeding speed of the feeding device based on the operating parameters of the crushing chamber and the material receiving status includes: Based on the material level change rate in the crushing chamber, the material level height in the crushing chamber, the material height change trend on the feeding device, and the second speed control model of the feeding device, the adjustment ratio of the feeding speed of the feeding device is determined. The second speed control model of the feeding device includes the material level change rate in the crushing chamber, a preset speed range, the material level height in the crushing chamber, a preset height range, the material height change trend on the feeding device, and the adjustment ratio of the feeding speed of the feeding device. The feeding speed of the feeding device is controlled according to the adjustment ratio of the feeding speed of the feeding device.

2. The feeding speed control method for a crushing system according to claim 1, characterized in that, The process of obtaining the operating parameters of the crushing chamber includes: Obtain the remaining space height of the crushing chamber, where the remaining space height of the crushing chamber is the distance between the material surface inside the crushing chamber and the reference surface; The material level in the crushing chamber is determined based on the height of the reference plane and the remaining space height of the crushing chamber. The rate of change of material level in the crushing chamber is determined based on the current material level height in the crushing chamber and the material level height in the crushing chamber at the previous moment.

3. The feeding speed control method for a crushing system according to claim 2, characterized in that, The process of obtaining the remaining space height of the crushing chamber includes: Obtain the remaining space height corresponding to at least two first detection positions within the crushing chamber, with each first detection position distributed circumferentially along the internal space of the crushing chamber; The remaining space height of the crushing chamber is determined by using a weighted average method based on the remaining space height corresponding to each of the first detection positions.

4. The feeding speed control method for a crushing system according to claim 1, characterized in that, The acquisition of the material receiving status of the feeding device includes: The material height corresponding to at least two second detection positions on the feeding device is obtained, and each of the second detection positions is distributed at intervals along the feeding direction of the feeding device. The trend of material height change on the feeding device is determined based on the material height corresponding to each of the second detection positions.

5. The feeding speed control method for a crushing system according to claim 1, characterized in that, The feeding speed control method for the crushing system further includes: Obtain the physical parameters of the material, which include at least the particle size, hardness, and mud content of the material. The adjustment ratio of the feeding speed of the feeding device is determined based on the physical parameters of the material.

6. The feeding speed control method for a crushing system according to claim 1, characterized in that, The operating parameters of the crushing chamber also include the operating current of the crushing chamber, and the feeding speed control method for the crushing system further includes: Obtain the operating current of the crushing chamber; When the operating current of the crushing chamber is greater than the limit current, the feeding speed of the feeding device is reduced.

7. A crushing system, characterized in that, Includes a controller capable of performing the feeding rate control method for a crushing system as described in any one of claims 1-6.

Images