Crushed stone generation system

Abstract

To provide a crushed stone generation system which performs precise inverter control of an IPM motor according to a crushing state of a stone material while utilizing performance of the high-performance IPM at a maximum to increase efficiency of generation of crushed stones.SOLUTION: A crushed stone generation system 1 for crushing a stone material to generate crushed stones includes: crushing teeth 19 which crush the stone material; an IPM motor 14 which drives the crushing teeth 19; a lithium-ion battery 13 which supplies electric power to the IPM motor 14 and absorbs regenerative energy from the IPM motor 14 to be charged; and an inverter 15 which controls operation of the IPM motor 14. The inverter 15 controls the operation of the IPM motor 14 according to a state of the stone material during crushing. The state of the stone material during crushing is acquired from a state detection sensor 16 as necessary.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a crushed stone generation system that crushes stones to generate desired crushed stones.

Background Art

[0002] When crushing stones such as concrete and natural rocks to produce crushed stones, it is very important to manage the yield and particle size distribution composition in order to achieve stable production and efficiency. Here, the yield refers to the ratio of crushed stones that are oversized or undersized with respect to the crushing size of the target crushed stones, and the particle size distribution composition is the ratio for each particle size of the generated crushed stones (for example, JIS A5005:2020, JIS A5001:2008, etc.).

[0003] In the drive by a three-phase motor or a hydraulic motor generally used in stone crushers, it is difficult to change the rotational speed of the crusher during operation, and even if it is changed, the efficiency of the motor itself drops. Therefore, there is a situation where it is difficult to efficiently produce crushed stones while strictly managing the yield and particle size distribution composition. In addition, the stones to be crushed include natural stones, concrete scraps, asphalt scraps, etc., and the specific gravity and compressive strength of each stone are different. Especially in the case of natural stones, the specific gravity and compressive strength vary depending on the region where the stones are mined, etc.

[0004] Therefore, the optimal rotational speed of the motor for generating crushed stones having a desired particle size from each stone cannot be found without trial and error while actually performing crushing, and there is a problem that it requires a very large amount of time and effort.

[0005] Due to such problems, in most crushing operations, the crusher is driven with the rotational speed fixed at the manufacturer's recommended rotational speed, and the adjustment of the yield and particle size distribution composition is only performed by adjusting the gap at the outlet of the crushing chamber of the crusher, making it difficult to efficiently generate high-quality crushed stones (see, for example, Patent Document 3).

[0006] In relation to the above-mentioned problems, for example, technologies related to Patent Documents 1 and 2 have been disclosed. The technology shown in Patent Document 1 involves accumulating case data regarding the amount of raw material input in a crushing plant, the current value and setting value of each crusher, the current value of each vibrating screen, the amount of crushed stone produced for each particle size, and the operating time. This case data is analyzed to estimate domain knowledge regarding the relationship between the maximum production amount or maximum production rate of crushed stone of a required particle size and the amount of raw material input and the setting value of each crusher, as well as the relationship between the required power consumption and the amount of raw material input and the setting value of each crusher. Based on this estimated domain knowledge, or by comparing the estimated domain knowledge with the case data, the amount of raw material input and the setting value of each crusher corresponding to the maximum production amount or maximum production rate of crushed stone of a required particle size, or the amount of raw material input and the setting value of each crusher corresponding to the required power consumption, is determined.

[0007] Furthermore, the technology described in Patent Document 2 comprises a crushing system which includes a crusher that crushes raw materials as they are intermittently fed in, a crusher motor that drives the crusher to generate crushing force on the raw materials, a motor control unit that controls the crusher motor, a no-load state detector that detects the no-load state of the crusher, and a system control device that has the function of controlling the motor control unit based on the detection signal from the no-load state detector. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Japanese Patent Publication No. 2003-200079 [Patent Document 2] Japanese Patent Publication No. 2014-121662 [Patent Document 3] Japanese Patent Publication No. 2018-192457 [Overview of the project] [Problems that the invention aims to solve]

[0009] The technology described in Patent Document 1 operates a crushing plant according to a desired method, but because the operating conditions are set based on pre-modeled information, it is not possible to set conditions suitable for the raw material during crushing. Even if it were possible to change the settings, it has the problem that it is extremely difficult to change the operating conditions while the crusher is running, as described above.

[0010] Furthermore, the technology described in Patent Document 2 is a technology that controls the motor based on the state of the crusher, but it only controls the motor according to whether the crusher is under load or unloaded, and therefore cannot solve the problems described above.

[0011] The present invention provides a crushed stone generation system that maximizes the performance of a high-performance IPM motor and efficiently generates crushed stone by precisely controlling the IPM motor with an inverter according to the crushing state of the stone material. [Means for solving the problem]

[0012] The crushed stone generation system according to the present invention is a crushed stone generation system that crushes stone material to produce crushed stone, and comprises crushing teeth for crushing the stone material, an IPM motor for driving the crushing teeth, a secondary battery that supplies power to the IPM motor and absorbs and charges regenerative energy from the IPM motor, and an inverter for controlling the operation of the IPM motor, wherein the inverter controls the operation of the IPM motor according to the state of the stone material during crushing.

[0013] Thus, the crushed stone generation system according to the present invention comprises crushing teeth for crushing stone materials, an IPM motor for driving the crushing teeth, a secondary battery that supplies power to the IPM motor and also absorbs and charges regenerative energy from the IPM motor, and an inverter for controlling the operation of the IPM motor. The inverter controls the operation of the IPM motor according to the state of the stone material during crushing, enabling crushing work under optimal conditions that match the characteristics of the stone material to be crushed. This has the effect of achieving efficient crushing work by strictly controlling the yield and particle size distribution.

[0014] The crushed stone generation system according to the present invention includes, if necessary, a gap adjustment means for adjusting the gap of the discharge port from which the crushed stone is discharged from the crushing chamber into which the stone material to be crushed is introduced, wherein the gap adjustment means adjusts the gap of the discharge port according to the state of the stone material during crushing.

[0015] Thus, the crushed stone generation system according to the present invention includes a gap adjustment means for adjusting the gap of the discharge port from which the crushed stone is discharged after being crushed by the crushing teeth, from the crushing chamber into which the stone material to be crushed is introduced. Since the gap adjustment means adjusts the gap of the discharge port according to the state of the stone material during crushing, by combining this with the control of the IPM motor that drives the crushing teeth, it is possible to more precisely control the yield and particle size distribution configuration.

[0016] The crushed stone generation system according to the present invention includes, if necessary, a first sensor that detects the amount of stone material to be crushed in a crushing chamber into which the stone material is fed, and the inverter controls the rotation speed of the IPM motor based on the rate of change of the amount of stone material detected by the first sensor.

[0017] Thus, the crushed stone generation system according to the present invention is equipped with a first sensor that detects the amount of stone material to be crushed in the crushing chamber into which the stone material to be crushed is introduced. The inverter controls the rotation speed of the IPM motor based on the rate of change of the amount of stone material detected by the first sensor. For example, if the amount of stone material decreases rapidly, a low rotation speed of the IPM motor increases the probability that sufficient compression crushing will not occur and the stone material will pass through the crushing chamber without being crushed. Therefore, by increasing the rotation speed of the IPM motor, it is possible to achieve proper crushing work by performing sufficient compression crushing.

[0018] The crushed stone generation system according to the present invention includes, if necessary, a second sensor that detects the amount and / or height of the stone material to be crushed in the crushing chamber into which the stone material is fed, and the inverter controls the rotation speed of the IPM motor based on the amount and / or height of the stone material to be crushed detected by the second sensor.

[0019] As described above, the crushed stone generation system according to the present invention is equipped with a second sensor that detects the amount and / or height of the stone material to be crushed in the crushing chamber into which the stone material to be crushed is fed. The inverter controls the rotation speed of the IPM motor based on the amount and / or height of the stone material to be crushed detected by the second sensor. For example, in the case of stone material that jumps a lot, there is a high possibility that it is slipping when compressed by the crushing teeth, and by adjusting the rotation speed of the IPM motor to a lower setting, the stone can be reliably gripped by the crushing teeth and crushed sufficiently. In other words, it has the effect of improving efficiency by crushing work at an appropriate rotation speed for each type of stone material.

[0020] The crushed stone generation system according to the present invention optionally includes a third sensor for detecting vibrations generated in the crushing chamber into which the stone material to be crushed is fed, and the inverter controls the rotation speed of the IPM motor according to the vibration state in the crushing chamber detected by the third sensor.

[0021] Thus, in the crushed stone generation system according to the present invention, a third sensor for detecting vibration generated in the crushing chamber into which the stone to be crushed is input is provided, and the inverter controls the rotational speed of the IPM motor according to the vibration state in the crushing chamber detected by the third sensor. Therefore, an effect can be achieved in which a crushing operation at an appropriate rotational speed according to the crushing state can be realized from the vibration state (for example, change in sound) that changes according to the crushing state.

[0022] The crushed stone generation system according to the present invention includes, as necessary, a particle size distribution specifying means for specifying the particle size distribution of the generated crushed stone, and a gap adjusting means for adjusting the gap of the discharge port through which the crushed stone crushed by the crushing teeth is discharged from the crushing chamber into which the stone to be crushed is input. Based on the specified particle size distribution, the inverter controls the rotational speed of the IPM motor, and the gap adjusting means adjusts the gap of the discharge port.

[0023] Thus, in the crushed stone generation system according to the present invention, a particle size distribution specifying means for specifying the particle size distribution of the generated crushed stone and a gap adjusting means for adjusting the gap of the discharge port through which the crushed stone crushed by the crushing teeth is discharged from the crushing chamber into which the stone to be crushed is input are provided. Based on the specified particle size distribution, the inverter controls the rotational speed of the IPM motor, and the gap adjusting means adjusts the gap of the discharge port. Therefore, an effect can be achieved in which the gap of the discharge port and the rotational speed of the IPM motor can be adjusted so that the actually generated particle size distribution becomes the target particle size distribution.

[0024] The crushed stone generation system according to the present invention includes, as necessary, a particle size distribution specifying means for specifying the particle size distribution of the generated crushed stone and a swing width adjusting means for adjusting the swing width of the crushing teeth. Based on the state during the crushing of the stone and / or the specified particle size distribution, the swing width adjusting means adjusts the swing width of the crushing teeth.

[0025] Thus, in the crushed stone generation system according to the present invention, there are provided a particle size distribution specifying means for specifying the particle size distribution of the generated crushed stone and a swing width adjusting means for adjusting the swing width of the crushing teeth. Based on the state during the crushing of the stone material and / or the specified particle size distribution, the swing width adjusting means adjusts the swing width of the crushing teeth, so that it is possible to manage to approach the target particle size distribution configuration according to the state during the crushing of the stone material and the particle size distribution configuration of the actually generated crushed stone.

Brief Description of the Drawings

[0026] [Figure 1] It is a functional block diagram showing the configuration of a crushed stone generation system according to the first embodiment. [Figure 2] In the crushed stone generation system according to the first embodiment, it is a diagram showing the structure of the crushing chamber when measuring the degree of sinking of the raw material with an ultrasonic sensor. [Figure 3] In the crushed stone generation system according to the first embodiment, it is a diagram showing the structure of the crushing chamber when measuring the bouncing of the raw material with an imaging sensor. [Figure 4] In the crushed stone generation system according to the first embodiment, it is a diagram showing the structure of the crushing chamber when detecting the vibration of the crushing chamber with a vibration sensor. [Figure 5] In the case of FIG. 2, it is a diagram showing the configuration when adjusting the gap of the discharge port in the crushing chamber.

Modes for Carrying Out the Invention

[0027] (The First Embodiment of the Present Invention)<00The crushed stone generation system according to this embodiment will be described with reference to Figures 1 to 5. The crushed stone generation system according to this embodiment is a hybrid type crushed stone generation system that performs crushing work while controlling the IPM motor with an inverter using a main power source such as a generator or commercial power supply, and replenishes and recovers power according to load fluctuations using a lithium-ion battery. By incorporating a lithium-ion battery, this system is able to maximize the performance of the IPM motor while protecting the inverter. As a result, in this embodiment, it is possible to perform optimal drive control according to the crushing state by controlling the operation of the IPM motor in real time and with precision.

[0028] Figure 1 is a functional block diagram showing the configuration of the crushed stone production system according to this embodiment. In Figure 1, the crushed stone production system 1 includes a crusher 10 that crushes natural stone, concrete, asphalt, etc., which are the raw materials for crushed stone; a supply machine 11 that supplies raw materials to the crusher 10; a conveyor 12 that transports the crushed stone crushed by the crusher 10; a lithium-ion battery 13 that supplies auxiliary power to the crusher 10 when an excessive load is placed on it, or absorbs and charges regenerative energy when the load on the crusher 10 decreases rapidly, separate from the main power supply (not shown in Figure 1); an IPM motor 14 for driving the crushing teeth of the crusher 10 (for example, crushing teeth that are operated by a flywheel, etc.); an inverter 15 that controls the drive of the IPM motor 14; a state detection sensor 16 that senses the crushing state of the crusher 10; and a control unit 17 that controls the entire system.

[0029] Crusher 10 includes, for example, jaw crushers and roll crushers for primary crushing, and cone crushers, impact crushers, or vertical crushers for secondary and tertiary crushing. Crushing of the raw material in crusher 10 is performed by driving crushing teeth within the crushing chamber, and the crushing teeth are driven by an IPM motor 14. The structure of the crushing chamber will be described in detail later. Furthermore, the crushed stone produced must be ultimately crushed to an appropriate size according to the desired particle size distribution configuration.

[0030] Here, particle size distribution refers to a distribution of particle sizes, such as 10% for 0mm to 15mm, 30% for 15mm to 50mm, 30% for 50mm to 85mm, and 10% for 85mm to 100mm. In other words, it is necessary to adjust the rotation speed and torque of the IPM motor 14 in each crusher 10 so that crushed stone is produced with this particle size distribution. Furthermore, when crushing is performed in stages using a single or multiple crushers 10, the gap of the discharge port must also be appropriately adjusted according to the size of the crushed stone discharged from each crusher.

[0031] As mentioned above, conventional crushing systems typically use three-phase motors or hydraulic motors for drive, making it difficult to change the rotational speed or torque of the crusher 10 while the system is running. This also resulted in a significant decrease in efficiency once the system was stopped. Furthermore, even when these settings were changed, the efficiency of the motor itself decreased, making it difficult to efficiently produce crushed stone while strictly controlling yield and particle size distribution.

[0032] However, in this embodiment, by having a lithium-ion battery 13 while driving the IPM motor 14 under the control of the inverter 15, it becomes possible to maximize the performance of the IPM motor 14 (i.e., drive it within the maximum specification range without applying an unnecessary limiter), and it also becomes possible to set the IPM motor 14 in real time according to the crushing state.

[0033] In the case of the crusher 10, when hard or large raw materials are fed in, the load on the motor increases, and when soft or small raw materials are fed in, the load on the motor decreases or becomes almost no load. In other words, a very large amount of regenerative energy is instantaneously generated in response to load fluctuations, and this regenerative energy can cause the motor or inverter to fail. To prevent this, a limit is usually set on the motor, but in this embodiment, the lithium-ion battery 13 can absorb the generated regenerative energy and function as a protection circuit, so it is possible to maximize the performance of the motor without setting a limit. In particular, in this embodiment, a high-performance IPM motor 14 is used, so it is possible to operate this IPM motor 14 without a limit, which makes it possible to further increase work efficiency.

[0034] Furthermore, conventionally, when changing the motor settings while the crusher 10 was in operation, a high-performance inverter was required to handle the large load on the crusher 10 and withstand the instantaneously generated regenerative energy. In that case, the inverter would be over-specced in operating conditions where no instantaneous regenerative energy is generated, resulting in a system with a very poor cost balance. In this embodiment, the performance of the high-performance IPM motor 14 can be maximized, and the regenerative energy can be absorbed by the lithium-ion battery 13. As a result, the inverter 15 will not overload and cause errors due to the generated regenerative energy, and the rotational speed of the IPM motor 14 can be accelerated, decelerated, started, and stopped in an extremely short time. In other words, the operation of the IPM motor 14 can be adjusted in real time while the system is running, and it is possible to control the IPM motor 14 appropriately to achieve the desired particle size distribution configuration according to the state of the crushed stone during crushing.

[0035] The crusher 10 has a state detection sensor 16 for detecting the state of the crushed stone during crushing, and the state information sensed here is transmitted to the control unit 17. Specifically, the state detection sensor 16 includes an ultrasonic sensor for measuring the upper end position of the raw material, a camera for imaging the raw material being crushed in the crushing chamber, a vibration sensor (accelerometer) for acquiring the vibration state in the crushing chamber where crushing takes place, and a sound sensor for detecting the sound generated during crushing. Information regarding the operating state of the IPM motor 14 detected by the state detection sensor 16 is sent from the inverter 15 to the control unit 17.

[0036] The control unit 17 calculates appropriate rotational speed and torque values ​​for the current raw material based on the information transmitted from the state detection sensor 16 and the information from the IPM motor 14 sent from the inverter 15, and returns this information to the inverter 15. The inverter 15 controls the rotational speed and torque of the IPM motor 14 according to the appropriate values ​​calculated by the control unit 17, thereby enabling crushing work to be performed with an appropriate load that matches the condition of the raw material.

[0037] Here, regarding the appropriate load for the condition of the raw materials, the raw materials to be crushed include natural stone, concrete rubble, and asphalt rubble. However, in the case of natural stone, the specific gravity and compressive strength of each raw material differ depending on the region where the raw material is extracted, and in the case of concrete rubble and asphalt rubble, they differ depending on the type and ratio of materials mixed in. Therefore, even for the same type of raw material, there is an optimal load for each, and the IPM motor 14 is controlled to match it.

[0038] There are several types of state detection sensors 16, and specific examples will be explained. The first specific example is an ultrasonic sensor. Figure 2 shows the structure of the crushing chamber when measuring the degree of sinking of the raw material using an ultrasonic sensor in the crushed stone generation system according to this embodiment. In Figure 2, the height H of the raw material is measured by an ultrasonic sensor 16a fixed to the upper part of the crushing chamber of the crusher 10 (jaw crusher). Based on the measured result, the control unit 17 calculates how fast the upper end position of the raw material is changing (sinking) and controls the IPM motor 14. Specifically, if the lowering speed of the upper end position of the raw material is faster than a predetermined speed, and the rotation speed of the IPM motor 14 is low, sufficient compression crushing will not occur, and the probability of passing through the crushing chamber will increase. Therefore, by adjusting the rotation speed of the IPM motor 14 to a higher level, sufficient compression crushing will be performed. Conversely, if the lowering speed of the upper end position of the raw material is slower than a predetermined speed, and the rotation speed of the IPM motor 14 is high, excessive compression crushing will occur. Therefore, by adjusting the rotation speed of the IPM motor 14 to a lower setting, it becomes possible to bypass the crushing chamber and perform appropriate compression crushing.

[0039] A second specific example is an imaging sensor. Figure 3 shows the structure of the crushing chamber in the crushed stone generation system according to this embodiment when the amount of material jumping is measured using an imaging sensor. As described above, the amount of slippage and jumping during compression in the crushing chamber of the crusher 10 varies depending on the specific gravity and compressive strength of the material. In other words, depending on the material, some material will be reliably caught in the crushing teeth, while others will slip and jump, and if there is a lot of jumping, it can be determined that the crushing teeth are not gripping the material sufficiently. Specifically, as shown in Figure 3, the imaging sensor 16b fixed to the top of the crushing chamber captures an image of the inside of the crushing chamber, and the control unit 17 calculates how much material is jumping and to what height. If it is determined that a predetermined amount of material is jumping above a predetermined height, the rotation speed of the IPM motor 14 can be lowered to ensure that the crushing teeth grip the material reliably and crush it.

[0040] A third specific example is a vibration sensor (accelerometer). Figure 4 shows the structure of the crushing chamber in the crushed stone production system according to this embodiment when vibrations in the crushing chamber are detected by a vibration sensor. The inside of the crushing chamber is constantly vibrating, and by acquiring this vibration state, the control unit 17 calculates the rotation speed and torque of the IPM motor 14. Specifically, for example, if the amplitude of the vibration detected by the vibration sensor 16c is large, it can be determined that the raw material contains large lumps because the vibration sensor 16c is moving a lot, and if the amplitude is small, it can be determined that the raw material lumps are small because the vibration sensor 16c is not moving much. Also, if the vibration frequency is high, it can be determined that relatively soft raw material is being crushed smoothly, and if the frequency is low, it can be determined that relatively hard raw material is being crushed. The control unit 17 calculates and adjusts the rotation speed and torque appropriate for the raw material according to these determination results.

[0041] Furthermore, when calculating the vibration state, it is possible to obtain the vibration state under no-load conditions in advance and subtract it from the vibration state under load conditions to obtain only the vibration caused by the load of the raw material. In addition, when determining the state of the raw material according to the vibration state, it is desirable to take into account the current setting value of the IPM motor 14. Specifically, for example, if the rotation speed of the IPM motor 14 is set high and the vibration frequency in the crushing chamber is also high, the raw material may be judged to be normal, and if the rotation speed of the IPM motor 14 is set high but the vibration frequency in the crushing chamber is low, the raw material may be judged to be hard.

[0042] The fourth specific example is a sound sensor. In this case, the configuration is the same as in Figure 4, but with the vibration sensor 16c replaced by a sound sensor 16d. Various sounds are generated when the raw material is crushed, but by frequency analysis of the generated sounds, it is possible to identify what kind of sounds are being generated and to analyze the crushing state of the raw material. For example, if the raw material is soft, there will be a relatively large number of high-frequency components, and if the raw material is hard, there will be a relatively large number of low-frequency components. By analyzing these frequency components, it becomes possible to control the IPM motor 14 appropriately according to the current crushing state. In the case of the sound sensor 16d, as with the vibration sensor 16c, sound information in the no-load state may be acquired in advance and subtracted from the sound information in the loaded state to acquire only the sounds generated by the load of the raw material.

[0043] In this way, by identifying the current crushing state from the information acquired by the state detection sensor 16 (ultrasonic sensor 16a, imaging sensor 16b, vibration sensor 16c, sound sensor 16d) and determining the corresponding setting value for the IPM motor 14, the rotation speed and torque of the IPM motor 14 can be adjusted instantly in real time to optimize them for the crushing state, thereby improving crushing efficiency.

[0044] Each state detection sensor 16, as shown in Figures 2 to 4, may be installed individually as an ultrasonic sensor 16a, an imaging sensor 16b, a vibration sensor 16c, and a sound sensor 16d, or they may be installed in combination. When multiple sensors are installed in combination, the average of the set values ​​obtained from each sensor may be used as the optimal value, or, for example, a priority order may be set in advance, and the optimal value may be obtained by multiplying by a coefficient corresponding to that priority order.

[0045] In addition to controlling the IPM motor 14 and inverter 15, the control unit 17 may also adjust the gap of the discharge port of the crusher 10. Figure 5 shows the configuration for adjusting the gap of the discharge port in the crushing chamber in the case of Figure 2. This gap adjustment is also applicable in Figures 3 and 4.

[0046] As mentioned above, the IPM motor 14 is controlled appropriately according to the raw material, making it possible to produce crushed stone of a certain size to some extent. However, in order to more precisely control the desired particle size distribution, the gap d of the discharge port 18 of the crushing chamber in the crusher 10 is important. Here, the crusher 10 may crush by compression through reciprocating motion or by applying impact, but in either case, oversized crushed stone is always included after crushing. In the case of equipment with a sorting machine such as a vibrating screen, a process of sorting by a predetermined size is included, so that oversized crushed stone and undersized crushed stone are transported separately on the conveyor 12.

[0047] In other words, as shown in Figure 1, the crushed stone from the crusher 10 is transported by a conveyor 12 through a feeder or screen. If the facility has a sorting machine, the weight of the conveyor 12 can be measured using belt scales such as a discharge belt conveyor 12a (not shown) for transporting crushed stone of a desired size, an oversize belt conveyor 12b (not shown) for transporting crushed stone larger than the desired size, and an undersize belt conveyor 12c (not shown) for transporting crushed stone smaller than the desired size.

[0048] When the measurement results of the belt scales of each conveyor 12 are transmitted to the control unit 17, the control unit 17 calculates the current particle size distribution configuration by accumulating these values ​​in real time. Then, it compares this with the information of a preset particle size distribution configuration to calculate how much of each size of crushed stone is present and adjusts the gap d of the discharge port 18 to achieve the desired particle size distribution configuration. The adjustment of the gap d of the discharge port 18 is performed by a cylinder 20 that adjusts the position of the crushing teeth 19 based on instruction information from the control unit 17.

[0049] In this way, the control unit 17 can accurately manage the particle size distribution configuration by adjusting the gap d of the discharge port 18 of the crushing chamber according to the information of the crushed stone being discharged.

[0050] The current particle size distribution can be calculated from the information on the belt scale as described above, or the amount of crushed stone of each size can be determined by analyzing the imaging information obtained from the imaging sensor installed on the conveyor 12 immediately after discharge. Furthermore, if there is a stockyard, the particle size distribution of the currently generated crushed stone can be calculated based on a sensor that can measure the amount in the stockyard or on imaging information taken of the stockyard.

[0051] In addition to controlling the IPM motor 14 and inverter 15 and the gap of the crushing chamber outlet, the control unit 17 may also control the supply amount of the feeder 11 (e.g., feeder or screen). As shown in Figure 1, the control unit 17 acquires information on the raw materials supplied from the feeder 11. It also calculates the load state of the IPM motor 14 and the particle size distribution configuration of the generated crushed stone, and adjusts the amount of raw materials supplied from the feeder 11 so that crushed stone with an appropriate particle size distribution configuration is produced. At this time, it is desirable that information including the size of the supplied raw materials is sent to the control unit 17. In other words, it is possible to store information on what particle size distribution configuration of crushed stone is produced under the current settings when a certain size of raw material is supplied, so that it is possible to estimate the optimal operating settings of the crusher 10 to achieve the desired particle size distribution configuration based on the size of the raw material supplied next.

[0052] At the same time, the control unit 17 can determine the load on the IPM motor 14 based on the operating status of the IPM motor 14 obtained from the state detection sensor 16. If it is determined that the load on the IPM motor 14 is high, the control unit 17 can control the supply amount of the feeder 11 to decrease, and if it is determined that the load on the IPM motor 14 is low, it can control the supply amount of the feeder 11 to increase. By doing so, it is possible to prevent excessive load from being placed on the IPM motor 14 and inverter 15, thereby achieving stable crushing and extending the lifespan of the IPM motor 14 and inverter 15.

[0053] In addition to controlling the IPM motor 14 and inverter 15, controlling the gap of the crushing chamber outlet, and controlling the supply amount of the feeder 11, the control unit 17 may also control the oscillation width (stroke) of the crushing teeth of the crusher 10. That is, particle size adjustment can be performed by adjusting the oscillation width according to the information acquired by the state detection sensor 16. Furthermore, as described above, the oscillation width may also be adjusted according to the measurement results of the belt scale of each conveyor 12. Specifically, for example, as described above, the rotation speed of the IPM motor can be controlled (increased or decreased) according to the measurement results of the state detection sensor 16, but if there is little change in the particle size configuration before and after the change in rotation speed, the oscillation width can be changed (made smaller or larger) to optimize the particle size configuration. Furthermore, as described above, the gap d of the crushing chamber outlet 18 can be adjusted (narrowed or widened) according to the measurement results of the state detection sensor 16 and the belt scale, but if there is little change in the particle size configuration before and after the change in gap d, the oscillation width can be changed (made smaller or larger) to optimize the particle size configuration.

[0054] In this way, by adjusting the oscillation width of the crushing teeth according to the crushing state of the raw material in the crushing chamber and the state of the crushed stone produced, it becomes possible to more precisely control the particle size distribution and produce the desired crushed stone.

[0055] In Figure 1, the crusher 10 process may be formed in multiple stages, such as primary crushing, secondary crushing, and tertiary crushing. In that case, one control unit 17 may be used to handle each of the multiple crushers 10 in each stage, or each crusher 10 may have its own dedicated control unit 17.

[0056] Furthermore, the control unit 17 may also work in conjunction with the lithium-ion battery 13, constantly monitoring the charging and discharging status of the lithium-ion battery 13, and performing battery level and voltage control according to the overall operating status of the system.

[0057] Thus, in the crushed stone generation system according to this embodiment, the inverter 15 controls the operation of the IPM motor 14 according to the state of crushing the stone material. This makes it possible to perform crushing work under optimal conditions that match the characteristics of the stone material to be crushed, and to achieve efficient crushing work by strictly controlling the yield and particle size distribution.

[0058] Furthermore, by adjusting the gap of the discharge port inside the crushing chamber according to the state of the stone during crushing, and by coordinating this with the control of the IPM motor 14 that drives the crushing teeth 19, the yield and particle size distribution can be controlled more precisely.

[0059] Furthermore, since the rotation speed of the IPM motor 14 is controlled based on the rate of change in the amount of stone material in the crushing chamber into which the stone material is fed, for example, if the amount of stone material decreases rapidly, a low rotation speed of the IPM motor 14 increases the probability that sufficient compression crushing will not occur and the stone material will pass through the crushing chamber without being crushed. Therefore, by increasing the rotation speed of the IPM motor 14, proper crushing work can be achieved by ensuring sufficient compression crushing.

[0060] Furthermore, the rotation speed of the IPM motor 14 is controlled based on the amount and / or height of the stone material that is to be crushed in the crushing chamber into which it is fed. For example, if a stone material bounces a lot, it is likely to slip when compressed by the crushing teeth, and by adjusting the rotation speed of the IPM motor 14 to a lower setting, it can be reliably gripped by the crushing teeth and crushed sufficiently. In other words, the crushing operation can be made more efficient by using an appropriate rotation speed for each type of stone material.

[0061] Furthermore, since the rotation speed of the IPM motor 14 is controlled according to the vibration state generated in the crushing chamber into which the stone to be crushed is fed, it is possible to perform crushing work at an appropriate rotation speed according to the crushing state based on the vibration state (for example, changes in sound) that changes depending on the crushing state.

[0062] Furthermore, based on the particle size distribution of the generated crushed stone, the inverter 15 controls the rotation speed of the IPM motor 14 and adjusts the gap of the discharge port. This allows the gap of the discharge port and the rotation speed of the IPM motor 14 to be adjusted from the actually generated particle size distribution to the desired particle size distribution.

[0063] Furthermore, by adjusting the oscillation width of the crushing teeth based on the state of the stone during crushing and / or the specified particle size distribution, it is possible to control the process to approach the desired particle size distribution configuration according to the state of the stone during crushing and the actual particle size distribution configuration of the crushed stone produced. [Explanation of Symbols]

[0064] 1. Crushed stone generation system 10 Crusher 11 Feeding machine 12 Conveyor 13 Lithium-ion batteries 14 IPM motors 15 Inverter 16 State detection sensor 17 Control Unit 18 Outlet 19 Crushing teeth 20 cylinders

Claims

1. In a crushed stone generation system that crushes stone materials to produce crushed stone, Crushing teeth for crushing the aforementioned stone material, The IPM motor drives the crushing teeth, A secondary battery that supplies power to the IPM motor and absorbs and charges regenerative energy from the IPM motor, An inverter that controls the operation of the IPM motor, An ultrasonic sensor is fixed to the top of the crushing chamber into which the stone material to be crushed is fed, and the height of the stone material inside the crushing chamber is detected. The system includes a control unit that calculates an appropriate value for the operation of the IPM motor based on the information detected by the ultrasonic sensor and the information of the IPM motor sent from the inverter, and returns it to the inverter, The control unit calculates the rate of change of the upper end position of the stone based on the height of the stone measured by the ultrasonic sensor, and sends a signal back to the inverter to adjust the rotation speed of the IPM motor to a higher level if the lowering speed of the upper end position of the stone is faster than a predetermined speed, and to adjust the rotation speed of the IPM motor to a lower level if the lowering speed of the upper end position of the stone is slower than a predetermined speed. A crushed stone generation system characterized in that the inverter controls the operation of the IPM motor in accordance with a signal from the control unit.

2. In the crushed stone generation system according to Claim 1, It is fixed to the upper part of the crushing chamber into which the stone material to be crushed is fed, and is equipped with an imaging sensor that captures images of the inside of the crushing chamber. The control unit, Based on the information detected by the imaging sensor and the information of the IPM motor sent from the inverter, the appropriate value for the IPM motor to operate is calculated and returned to the inverter. Based on the information captured by the image sensor, the system calculates how high and how much the stone is bouncing, and if the stone is bouncing above a predetermined height and above a predetermined amount, it sends a signal back to the inverter to adjust the rotation speed of the IPM motor to a lower value. A crushed stone generation system characterized in that the inverter controls the operation of the IPM motor in accordance with a signal from the control unit.

3. In the crushed stone generation system according to claim 1 or 2, It is fixed near the crushing chamber into which the stone material to be crushed is fed, and is equipped with a vibration sensor that detects vibrations generated inside the crushing chamber. The control unit, Based on the information detected by the vibration sensor and the information of the IPM motor sent from the inverter, the appropriate value for the IPM motor to operate is calculated and returned to the inverter. The vibration sensor calculates the amplitude and / or frequency of the vibration, determines the size of the stone mass based on the amplitude, determines the hardness of the stone based on the frequency, calculates the rotational speed and / or torque of the IPM motor suitable for the stone according to the size and / or hardness of the stone mass, and returns a signal to the inverter. A crushed stone generation system characterized in that the inverter controls the operation of the IPM motor in accordance with a signal from the control unit.

4. In the crushed stone generation system according to any one of claims 1 to 3, The crushing chamber into which the stone material to be crushed is fed is equipped with a gap adjustment means for adjusting the gap of the discharge port from which the crushed stone is discharged by the crushing teeth, A crushed stone generation system characterized in that the gap adjustment means adjusts the gap of the discharge port according to the state of the crushing of the stone material.

5. In the crushed stone generation system according to any one of claims 1 to 4, A particle size distribution identification means for identifying the particle size distribution of the generated crushed stone, The system includes a gap adjustment means for adjusting the gap of the discharge port from which the crushed stone is discharged after being crushed by the crushing teeth, from the crushing chamber into which the stone material to be crushed is fed, A crushed stone generation system characterized in that, based on the identified particle size distribution, the inverter controls the rotation speed of the IPM motor, and the gap adjustment means adjusts the gap of the discharge port.

6. In the crushed stone generation system according to any one of claims 1 to 5, A particle size distribution identification means for identifying the particle size distribution of the generated crushed stone, The system includes a swing width adjustment means for adjusting the swing width of the crushing teeth, A crushed stone production system characterized in that the oscillation width adjustment means adjusts the oscillation width of the crushing teeth based on the state of the crushed stone material during crushing and / or the specified particle size distribution.

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