Grinding medium information estimation method and grinder

Abstract

To provide a method capable of estimating a residual amount of a grinding medium without visually inspecting the inside of a shell.SOLUTION: A grinding medium information estimation method targets a grinder for grinding a grinding object by storing the grinding object and a grinding medium in a shell to rotationally drive the shell. The grinding medium information estimation method injects water into the shell of the grinder in a state with no grinding object stored in the shell and in a state with no water stored in the shell. The grinding medium information estimation method estimates a residual amount of the grounding medium stored in the shell on the basis of a relation of an amount of the injected water, a water level of the shell and the volume of the shell.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] This application mainly relates to a method for estimating grinding media information for estimating the remaining amount of grinding media contained in a grinder.

Background Art

[0002] Patent Document 1 discloses a grinding mill. The grinding mill includes a horizontally cylindrical grinding body, which may also be referred to as a shell. The grinding body contains steel balls or steel rods as grinding media and an object to be ground. When the grinding body moves, the grinding media and the object to be ground are lifted up to a certain height and then fall due to gravity. The object to be ground is ground by the impact when it falls and the impact when the grinding media falls on the object to be ground.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a grinder such as the grinding mill of Patent Document 1, since the grinding media wears out, it is necessary to replenish the grinding media. However, in order to check the state of the grinding media, it is necessary to visually inspect the inside of the shell. However, since the shell of the grinder is closed, operations such as removing other parts or opening the shell are required. These operations are a burden on the operator. Also, it is difficult to accurately specify the actual amount of the grinding media only by visually inspecting the inside of the shell. For the above reasons, a method for estimating the remaining amount of the grinding media, which replaces the method of visually inspecting the inside of the shell, has been desired.

[0005] This application has been made in view of the above circumstances, and its main object is to provide a method for estimating the remaining amount of the grinding medium without visually inspecting the inside of the shell.

Means for Solving the Problems

[0006] The problem to be solved by this application is as described above. Next, the means for solving this problem and its effects will be described.

[0007] According to a first aspect of this application, the following method for estimating grinding medium information is provided. The method for estimating grinding medium information targets a grinder that grinds a grinding object by accommodating the grinding object and the grinding medium in a shell and rotationally driving the shell, and estimates the remaining amount of the grinding medium. In this method, water is injected into the shell of the grinder in a state where no grinding object is accommodated in the shell and no water is accumulated in the shell. In this method, based on the relationship among the amount of water injected, the water level of the shell, and the volume of the shell, the remaining amount of the grinding medium accommodated in the shell is estimated.

[0008] According to a second aspect of this application, a grinder having the following configuration is provided. That is, the grinder includes a shell, an injection unit, and a control device. The shell is rotationally driven while accommodating a grinding object and a grinding medium. The injection unit injects water into the shell in a state where no grinding object is accommodated in the shell and no water is accumulated in the shell. The control device estimates the remaining amount of the grinding medium accommodated in the shell based on the change in the water level of the shell due to the injection unit injecting water and the volume of the shell.

Advantages of the Invention

[0009] According to this application, it is possible to provide a method for estimating the remaining amount of the grinding medium without visually inspecting the inside of the shell.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Mode for Carrying Out the Invention

[0011] Next, the disclosed embodiments will be described with reference to the drawings. FIG. 1 is a perspective view showing the overall configuration of a crusher 100 according to an embodiment of the present application.

[0012] The crusher 100 shown in FIG. 1 is a wet ball mill. The crusher 100 is used as a sand making machine that crushes crushed stone as an object to be crushed to produce sand. The crusher 100 includes a shell 10, a supply unit 20, and a discharge unit 30.

[0013] The shell 10 is a hollow member. The shell 10 can be formed, for example, in a cylindrical shape. The shell 10 may also be called a grinding drum. The central axis of the shell 10 is arranged horizontally or slightly inclined so as to be downward as it approaches the discharge unit 30.

[0014] A large number of balls as the grinding medium 18 shown in FIG. 3 are arranged inside the shell 10. The balls are, for example, steel balls. However, instead of balls, rods can also be used as the grinding medium 18.

[0015] A plurality of support tires 11 are arranged below the shell 10. Two shell wheels 12 are fixed to the outer peripheral surface of the shell 10. Each shell wheel 12 is formed in a ring shape. The outer diameter of the shell wheel 12 is larger than the outer diameter of the shell 10.

[0016] The shell 10 is arranged such that the shell wheel 12 rests on a plurality of support tires 11. At least a part of the support tires 11 is rotationally driven by transmitting a driving force from an electric motor or the like. Thereby, the shell 10 rotates about a substantially horizontal rotation axis 10c. This rotation axis 10c coincides with the central axis of the shell 10.

[0017] On the side of the shell 10, two guide tires 13 are rotatably supported. The guide tires 13 are inserted between the two shell wheels 12. By the guide tires 13 contacting the shell wheels 12, the axial position of the shell 10 can be regulated.

[0018] At one end in the axial direction of the shell 10, a supply unit 20 is arranged. The supply unit 20 is formed with an inlet 21 for charging stones, which are objects to be crushed. Since the crusher 100 of the present embodiment is wet, water is also injected from the inlet 21. Thereby, the raw material and water enter the internal space through the central hole at the axial end of the shell 10.

[0019] A large number of liners 15 are arranged and fixed on the inner wall surface of the shell 10. The liner 15 functions as a protective member for protecting the inner wall surface of the shell 10. The liner 15 is removably fixed to the shell 10.

[0020] The liner 15 arranged on the axial end surface among the inner wall surfaces of the shell 10 is formed in a flat plate shape. On the other hand, the liner 15 arranged on the inner peripheral surface of the cylinder among the inner wall surfaces of the shell 10 has protrusions 9. When the shell 10 rotates, the raw material and balls at the bottom of the internal space are pushed by the protrusions 9, so the raw material and balls are scraped up along the inner peripheral surface of the shell 10 and eventually fall from the protrusions 9. Thereby, the raw material can be crushed well.

[0021] In the axial direction of the shell 10, a sizing device 31 such as a trommel is connected to the end on the side opposite to the supply unit 20. The internal space of the shell 10 and the sizing device 31 are connected through a passage 32 disposed at the center of the shell 10. The sizing device 31 is, for example, a rotary sieve. The sizing device 31 rotates integrally with the shell 10.

[0022] The raw materials and water that have overflowed from the internal space of the shell 10 enter the inside of the sizing device 31 through the passage 32 and are sized by the rotating sieve.

[0023] A discharge unit 30 is disposed so as to cover the sizing device 31. At the lower part of the discharge unit 30, a first discharge port 35 for discharging the sand that has passed through the sieve of the sizing device 31 and a second discharge port 36 for discharging the sand that has not been able to pass through the sieve are formed. The sand discharged from the second discharge port 36 is returned to the inlet 21 again by appropriate means and pulverized.

[0024] Next, with reference to FIGS. 2 and 3, the wear of the grinding medium 18 will be described.

[0025] As the pulverizer 100 pulverizes the raw materials, the grinding medium 18 wears. As a result, the pulverizing ability of the pulverizer 100 decreases. In order to maintain the pulverizing ability, it is preferable to replenish the grinding medium 18 according to the wear of the grinding medium 18 and keep the amount of the grinding medium 18 within a certain range.

[0026] When the grinding medium 18 wears, the volume of the grinding medium 18 decreases, so the height of the grinding medium 18 in the shell 10 decreases. Therefore, conventionally, the parts of the pulverizer 100 were removed and the inside of the shell 10 was visually inspected, for example, from the central hole at the axial end of the shell 10, and the remaining amount of the grinding medium 18 was estimated based on the height of the grinding medium 18 in the shell 10. The relationship between the remaining amount of the grinding medium 18 and the wear amount is as follows. "Wear amount of the grinding medium 18" = "Reference amount of the grinding medium 18" - "Remaining amount of the grinding medium 18"

[0027] The reference amount of the grinding medium 18 is the amount of the grinding medium 18 necessary to exhibit sufficient grinding ability. The amount of the grinding medium 18 is the total volume of the plurality of grinding media 18 accommodated in the shell 10. Therefore, for example, the height occupied by the grinding medium 18 in the shell 10 is correlated with the amount of the grinding medium 18. The reference amount of the grinding medium 18 is, for example, the amount of the grinding medium 18 when the grinder 100 is operated for the first time. Also, the reference amount may be determined based on design or the like. Therefore, the remaining amount of the grinding medium 18 and the wear amount of the grinding medium 18 are technically equivalent, and one of them can be obtained by obtaining the other.

[0028] In the conventional method, in order to visually inspect the inside of the shell 10, it is necessary to remove the parts of the grinder 100, which is a burden on the operator. Also, just by visually inspecting the inside of the shell 10, it is difficult to accurately identify the height of the grinding medium 18 in the shell 10, so the remaining amount of the grinding medium 18 may not be accurately estimated. Also, although it is not impossible to estimate the remaining amount of the grinding medium 18 based on the operating time of the grinder 100, due to irregularities such as the material or shape of the raw material, there is variation in the degree of wear of the grinding medium 18, and the remaining amount of the grinding medium 18 cannot be accurately estimated. On the other hand, in the grinding medium information estimation method of the present embodiment, the remaining amount of the grinding medium 18 can be accurately estimated without visually inspecting the inside of the shell 10. Specifically, the operator performs each step shown in FIG. 2.

[0029] First, the operator prepares so that the shell 10 is in a state where no object to be ground is accommodated and no water is accumulated in the shell 10. Specifically, if there is an object to be ground remaining in the shell 10, the operator operates the grinder 100 to discharge the object to be ground in the shell 10 (step 1). Next, if there is water remaining in the shell 10, the operator drains the water in the shell 10 (step 2). Draining the water is, for example, opening the drain hole of the shell 10. The drain hole is, for example, a bolt hole for attaching the liner 15. Thereby, the state of the figure described as preparation completed in FIG. 3 is realized.

[0030] In addition, when there is no object to be crushed or water in the shell 10, step 1 or step 2 can be omitted. Also, as long as the object to be crushed and water in the shell 10 can be discharged, the specific method may be different from this embodiment.

[0031] Next, the operator injects water into the shell 10 (step 3). Since the crusher 100 of this embodiment is wet as described above, water is injected into the shell 10 using the same structure as during crushing, that is, the supply unit 20. Also, the amount of water injected into the shell 10 is measured using the integrated flow meter 41 shown in FIG. 3. The integrated flow meter 41 is a device that measures the total value of the flow rate from the start of measurement.

[0032] When water is injected into the shell 10, as shown in the figure described as "during injection" in FIG. 3, water accumulates in the shell 10. Thereafter, as the injection of water continues, as shown in the figure described as "overflow" in FIG. 3, the water moves from the central hole at the axial end of the shell 10 to the discharge unit 30 side. That is, water overflows from the internal space of the shell 10. The overflowed water is discharged from the first discharge port 35 described above. Also, the less the remaining amount of the grinding medium 18, the smaller the volume of the grinding medium 18, so more water is required until overflow occurs. That is, the degree of change in the water level varies according to the remaining amount of the grinding medium 18.

[0033] The operator grasps that the water has overflowed by looking at the water that has fallen from the first discharge port 35. The operator stops the injection of water at the timing when the overflow of water is confirmed (step 4). Also, the integrated flow meter 41 measures the amount of water injected until the water overflows. Hereinafter, this amount is referred to as the integrated water volume. The integrated water volume is used to measure the remaining amount of the grinding medium 18.

[0034] Next, the operator estimates the wear amount of the liner 15 and thereby estimates the volume of the liner 15. That is, as the wear of the liner 15 progresses, the volume of the liner 15 decreases, so more water is required before overflow occurs. Therefore, by considering the wear amount of the liner 15, the remaining amount of the grinding medium 18 can be estimated with higher accuracy. The wear amount of the liner 15 can be estimated, for example, by an empirically obtained formula according to the operating time, the type of raw material, and the like. Alternatively, a wear confirmation member may be provided so as to penetrate the shell 10, and the remaining amount of the liner 15 may be estimated based on the wear state of the wear confirmation member.

[0035] Next, the operator estimates the remaining amount of the grinding medium 18 using the following formula (1). "Remaining amount of the grinding medium 18" = "Design volume of the shell 10 up to the reference water level" - "Volume of the liner 15 below the reference water level" - "Integrated water volume"... (1) The reference water level is the water level at which overflow occurs, in other words, the water level corresponding to the lowermost part of the central hole at the axial end of the shell 10. The design volume of the shell 10 can be calculated using design data. Instead of the design volume, a measured value of the volume of the shell 10 can also be used. The volume of the shell 10 can be measured, for example, using a 3D scanner. The volume of the liner 15 below the reference water level can be specified based on design data or based on measurement. That is, formula (1) utilizes the fact that the volume of the shell 10 up to the reference water level is equal to the sum of the volume of water, the liner 15, and the grinding medium 18 filling that space. Thus, the remaining amount of the grinding medium 18 can be estimated.

[0036] Next, the operator estimates the replenishment amount of the grinding medium 18 using the following formula (2). That is, the replenishment amount required to return the grinding medium 18 to the reference amount is estimated. "Replenishment amount of the grinding medium 18" = "Reference amount of the grinding medium 18" - "Remaining amount of the grinding medium 18"... (2)

[0037] By performing the above method, it is possible to accurately estimate the remaining amount and replenishment amount of the grinding medium 18 without visually inspecting the inside of the shell 10. In addition, the water injected for estimating the remaining amount and replenishment amount of the grinding medium 18 may be drained and discharged, or may be used for grinding the raw material.

[0038] Although the preferred embodiments of the present application have been described above, the above method can be modified as follows, for example.

[0039] In this embodiment, the remaining amount of the grinding medium 18 is calculated using the estimated value of the volume of the liner 15. Instead of this, without estimating the volume of the liner 15, the remaining amount of the grinding medium 18 may be estimated using the volume of the liner 15 in a non-worn state. Alternatively, the remaining amount of the grinding medium 18 may be estimated without considering the volume of the liner 15. In these methods, the estimation accuracy is slightly reduced, but the labor required for the operator can be reduced.

[0040] The reference water level in this embodiment is the water level at which overflow occurs. Instead of this, as long as it can be detected by some sensor or float etc. that a predetermined water level has been reached, a predetermined water level unrelated to the overflow may be used as the reference water level.

[0041] In this embodiment, the water level is fixed at the reference water level, and the integrated water volume for achieving the reference water level is measured. Instead of this, the amount of water to be injected may be fixed at the reference water volume, and the water level when the reference water volume is injected may be measured. Note that, as a sensor for detecting the water level in the shell 10, a sensor that provides a space where the water level changes in the same manner as inside the shell 10, disposes a float in the space, and detects the position of the float can be used. Also, in this case, the following formula (3) can be used. "Remaining amount of the grinding medium 18" = "Design volume of the shell 10 based on the current water level" - "Volume of the liner below the current water level" - "Reference water volume" ···(3) Even when using formula (3), instead of the designed volume of the shell 10, the measured value of the volume of the shell 10 can be used. Here, when using formula (3), the water level is not specified in advance. Therefore, it is preferable to associate the water level with the volume of the shell 10 corresponding to the water level and store them in a table format in advance. Similarly, for the liner 15, it is preferable to associate the water level with the volume of the liner 15 below the water level and store them in a table format in advance.

[0042] The overflow may be visually confirmed by an operator or remotely confirmed by a camera or the like. Or it may be detected by a sensor. The operation of calculating the replenishment amount is not essential, and only the remaining amount may be calculated. Instead of the integrated flowmeter 41, a sensor for measuring the amount of water in the shell 10 may be used.

[0043] Next, with reference to FIGS. 4 and 5, a modified example of the above embodiment will be described. In the description of this modified example, members that are the same as or similar to those in the aforementioned embodiment may be denoted by the same reference numerals in the drawings, and the description may be omitted.

[0044] The method for estimating the grinding medium information in the above embodiment includes the operation by an operator. Instead, in this modified example, the remaining amount of the grinding medium 18 can be estimated only by the devices provided in the grinder 100 without requiring the operation of the operator.

[0045] Specifically, the grinder 100 includes a control device 40, an integrated flowmeter 41, a water detection sensor 42, and a supply unit 20 shown in FIG. 4.

[0046] The control device 40 is a microcomputer including a CPU, a memory, a storage, and a communication device. By the CPU executing the program stored in the storage, the control device 40 can perform various processes. The control device 40 may be a control device for the grinding operation of the grinder 100 or a dedicated control device for calculating the remaining amount of the grinding medium 18.

[0047] The integrated flow meter 41 measures the integrated water volume described above. The integrated flow meter 41 outputs the measured integrated water volume to the control device 40. The water detection sensor 42 is a sensor that detects the above-described overflow. The water detection sensor 42 outputs the detection result to the control device 40. The supply unit 20 injects water into the shell 10 as described above. The supply unit 20 of this modified example is provided with an electromagnetic valve, and based on the control of the control device 40, it can switch between a state of injecting water into the shell 10 and a state of not injecting water into the shell 10.

[0048] The control device 40 performs the processes shown in the flowchart of FIG. 5 to calculate the remaining amount and replenishment amount of the grinding medium 18. Since the principle of calculating the remaining amount and replenishment amount of the grinding medium 18 is the same as that of the above-described embodiment, the processes performed by the control device 40 will be described.

[0049] After the operator performs the preparations shown in Steps 1 and 2, the operator operates a button (not shown) or the like to give an instruction to estimate the remaining amount of the grinding medium 18. When the control device 40 determines that there is an instruction from the operator to estimate the remaining amount of the grinding medium 18 (S101), it controls the supply unit 20 to start injecting water (S102).

[0050] The control device 40 determines whether the water detection sensor 42 has detected water (S103). When it determines that the water detection sensor 42 has detected water, it stops the supply of water (S104). Then, the control device 40 estimates the volume of the liner 15 (S105). Next, the control device 40 calculates the remaining amount of the grinding medium 18 using the above-described formula (1) (S106), and calculates the replenishment amount of the grinding medium 18 using the above-described formula (2) (S107).

[0051] In this modified example, the operator performs water drainage before injecting water, but an electromagnetic valve or the like may be provided in the water drainage hole, and the control device 40 may perform water drainage.

[0052] (Feature 1) As described above, in the above embodiment, the following pulverizing medium information estimation method is performed. That is, in this method, the target is a pulverizer 100 that pulverizes an object to be pulverized by accommodating the object to be pulverized and the pulverizing medium 18 in the shell 10 and rotationally driving the shell 10. In this method, water is injected into the shell 10 of the pulverizer 100 in a state where no object to be pulverized is accommodated in the shell 10 and no water is accumulated in the shell 10. In this method, based on the relationship among the amount of water injected, the water level in the shell 10, and the volume of the shell 10, the remaining amount of the pulverizing medium 18 accommodated in the shell 10 is estimated.

[0053] Thereby, the remaining amount of the pulverizing medium 18 can be estimated without visually observing the inside of the shell 10.

[0054] (Feature 2) In the above embodiment, water is injected into the shell 10 until a predetermined reference water level is reached, and based on the amount of water injected until the reference water level is reached and the volume of the shell 10, the remaining amount of the pulverizing medium 18 accommodated in the shell 10 is estimated.

[0055] Thereby, the remaining amount of the pulverizing medium 18 can be estimated only by measuring and calculating the amount of water injected until the reference water level is reached.

[0056] (Feature 3) In the above embodiment, a predetermined amount of water is injected into the shell 10, and based on the water level in the shell 10 after the water injection and the volume of the shell 10, the remaining amount of the pulverizing medium 18 accommodated in the shell 10 is estimated.

[0057] Thereby, the remaining amount of the pulverizing medium 18 can be estimated only by measuring and calculating the water level in the shell 10 after the water injection.

[0058] (Feature 4) In the above embodiment, the wear amount of the pulverizing medium 18 is estimated by comparing the estimated remaining amount of the pulverizing medium 18 with the reference amount of the pulverizing medium 18.

[0059] Thereby, the wear condition of the pulverizing medium 18 can be grasped.

[0060] (Feature 5) In the above embodiment, the replenishment amount of the grinding medium 18 is estimated based on the wear amount of the grinding medium 18.

[0061] Thereby, an appropriate replenishment amount of the grinding medium 18 can be estimated.

[0062] (Feature 6) In the above embodiment, the grinder 100 includes a liner 15 fixed to the inner wall of the shell 10. In this method, the wear amount of the liner 15 is estimated to estimate the volume of the liner 15. In this method, based on the change in the water level of the shell 10 due to water injection, the volume of the shell 10, and the volume of the liner 15, the remaining amount of the grinding medium 18 accommodated in the shell 10 is estimated.

[0063] Thereby, in order to further consider the volume of the liner 15 and the wear amount of the liner 15, the remaining amount of the grinding medium 18 can be accurately estimated.

[0064] (Feature 7) In the above embodiment, the grinder 100 is wet. The grinder 100 includes a sizing device 31 that drops and sizes the object to be ground (specifically, sand) ground by the shell 10 from a gap. Water is injected into the shell 10 until an overflow state is reached where water is discharged from the gap of the sizing device 31. The remaining amount of the grinding medium 18 accommodated in the shell 10 is estimated by subtracting the amount of water injected until the overflow state occurs from the volume of the shell 10 in which the overflow occurs.

[0065] Thereby, by utilizing the structure of the existing grinder 100, the remaining amount of the grinding medium 18 can be estimated.

[0066] (Feature 8) In the above embodiment, an integrating flowmeter 41 is provided in the injection part for injecting water into the shell 10. Water is injected into the shell 10 until a predetermined reference water level is reached, and based on the measured value of the integrating flowmeter 41 at the timing when the reference water level is reached and the volume of the shell 10, the remaining amount of the grinding medium 18 accommodated in the shell 10 is estimated.

[0067] By using the integrated flowmeter 41, the amount of water injected into the shell 10 can be easily and accurately measured.

[0068] The pulverized media information estimation method can be realized by combining the above-described features 1 to 8 as follows, for example. [Method 1] Pulverized media information estimation method having feature 1 [Method 2] Pulverized media information estimation method having feature 2 in addition to Method 1 [Method 3] Pulverized media information estimation method having feature 3 in addition to Method 1 [Method 4] Pulverized media information estimation method having feature 4 in addition to any one of Methods 1 to 3 [Method 5] Pulverized media information estimation method having feature 5 in addition to any one of Methods 1 to 4 [Method 6] Pulverized media information estimation method having feature 6 in addition to any one of Methods 1 to 5 [Method 7] Pulverized media information estimation method having feature 7 in addition to any one of Methods 1 to 6 [Method 8] Pulverized media information estimation method having feature 8 in addition to any one of Methods 1 to 7 [Method 9] Pulverized media information estimation method having feature 9 in addition to any one of Methods 1 to 8

[0069] The functions of the elements disclosed in this specification can be executed using a circuit or a processing circuit including a general-purpose processor, a dedicated processor, an integrated circuit, an ASIC (Application Specific Integrated Circuits), a conventional circuit, and / or a combination thereof, configured or programmed to execute the disclosed functions. Since a processor includes transistors and other circuits, it is regarded as a processing circuit or a circuit. In the present disclosure, a circuit, a unit, or a means is either hardware that executes the recited functions or hardware programmed to execute the recited functions. The hardware may be the hardware disclosed in this specification or, alternatively, other known hardware programmed or configured to execute the recited functions. When the hardware is a processor, which is considered a type of circuit, the circuit, the means, or the unit is a combination of hardware and software, and the software is used for configuring the hardware and / or the processor.

Description of the Reference Numerals

[0070] 10 Shell 20 Supply Unit 30 Discharge Unit 100 Pulverizer

Claims

1. A method for estimating pulverizing medium information for estimating the remaining amount of a pulverizing medium in a pulverizer that pulverizes a material to be pulverized by accommodating the material to be pulverized and the pulverizing medium in a shell and rotationally driving the shell, injecting water into the shell of the pulverizer in a state where no material to be pulverized is accommodated in the shell and no water is accumulated in the shell, A method for estimating pulverizing medium information, which estimates the remaining amount of the pulverizing medium accommodated in the shell based on the relationship between the amount of water injected, the water level in the shell, and the volume of the shell.

2. The method for estimating pulverizing medium information according to Claim 1, injecting water into the shell until a predetermined reference water level is reached, and estimating the remaining amount of the pulverizing medium accommodated in the shell based on the amount of water injected until the reference water level is reached and the volume of the shell.

3. The method for estimating pulverizing medium information according to Claim 1, injecting a predetermined amount of water into the shell, and estimating the remaining amount of the pulverizing medium accommodated in the shell based on the water level in the shell after the water injection and the volume of the shell.

4. The method for estimating pulverizing medium information according to Claim 1, estimating the wear amount of the pulverizing medium by comparing the estimated remaining amount of the pulverizing medium with the reference amount of the pulverizing medium.

5. The method for estimating pulverizing medium information according to Claim 4, estimating the replenishment amount of the pulverizing medium based on the wear amount of the pulverizing medium.

6. The method for estimating pulverizing medium information according to Claim 1, the pulverizer includes a liner fixed to the inner wall of the shell, estimating the wear amount of the liner and estimating the volume of the liner, estimating the remaining amount of the pulverizing medium accommodated in the shell based on the change in the water level of the shell due to water injection, the volume of the shell, and the volume of the liner.

7. The method for estimating pulverizing medium information according to Claim 1, the pulverizer is wet, the pulverizer includes a classifying device that drops the material to be pulverized pulverized by the shell from a gap for classification, injecting water into the shell until an overflow occurs where water is discharged from the gap of the classifying device. A method for estimating the remaining amount of the grinding medium stored in the shell by subtracting the amount of water injected until overflow from the volume of the shell where the overflow occurs.

8. The method for estimating grinding medium information according to claim 1, wherein an integrating flow meter is provided in an injection section for injecting water into the shell, water is injected into the shell until a predetermined reference water level is reached, and the remaining amount of the grinding medium stored in the shell is estimated based on the measured value of the integrating flow meter at the timing when the reference water level is reached and the volume of the shell.

9. A shell that is rotationally driven while containing an object to be ground and a grinding medium, an injection section for injecting water into the shell in a state where no object to be ground is stored in the shell and no water is accumulated in the shell, a control device for estimating the remaining amount of the grinding medium stored in the shell based on the change in the water level of the shell due to the injection of water by the injection section and the volume of the shell, a grinding machine comprising the same.

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