Gyro-type crusher and method for estimating wear state of dust seal ring

Abstract

To provide a gyratory crusher which enables easy maintenance work concerning a dust seal ring.SOLUTION: A gyratory crusher crushes an object to be crushed. The gyratory crusher comprises a cone cave 7, an eccentric sleeve 8, a main spindle 5, a mantle 6, an oil chamber 41, a partition part 44, a dust seal ring 45, an annular space 42, a supply port 61, a pressure sensor 81, and a control part. The partition part 44 is provided around the oil chamber 41. The dust seal ring 45 is provided around the partition part 44, and forms the annular space 42 so as to surround the main spindle 5 together with the mantle 6 and the partition part 44. A gas is supplied into the annular space 42 from the supply port 61. The pressure sensor 81 detects a pressure in the annular space 42. The control part acquires a pressure change amount in the annular space 42 over time on the basis of the pressure detected by the pressure sensor 81, and outputs information based on this.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention primarily relates to a gyratory crusher. [Background technology]

[0002] Conventionally, gyratory crushers such as cone crushers have been used as machines for crushing rocks, etc. This gyratory crusher crushes rocks by a mantle and a cone cave. Patent Document 1 discloses this type of gyratory crusher.

[0003] The gyratory crusher of Patent Document 1 includes a main shaft, an eccentric sleeve, a mantle, and a cone cave. The main shaft is rotatably inserted into the eccentric sleeve housed in a frame assembly. The mantle is mounted on a mantle core fixed to the main shaft. The back surface of the mantle core is supported by a mantle support provided on the frame assembly. During operation of the gyratory crusher, the mantle makes a grinding motion against the cone cave as the main shaft rotates, and materials to be crushed are supplied to a crushing chamber formed between the mantle and the cone cave and crushed. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2014-108390 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the gyratory crusher of Patent Document 1, a large load is applied to the main shaft during operation, and therefore lubricating oil is supplied around the main shaft to rotate the main shaft smoothly. A part of the lubricating oil is supplied to a portion (sliding portion) where the mantle performing the pestle motion is supported by the mantle support base. The lubricating oil is filled in an oil chamber formed inside the mantle support base.

[0006] The lubricating oil can move between the oil chamber and the annular space formed outside the mantle support through the sliding portion. The annular space is disposed at a predetermined distance from the crushing chamber, but dust such as crushed powder filling the crushing chamber may be mixed into the lubricating oil in the annular space. If dust is mixed into the lubricating oil, the lubricating performance will deteriorate, and it may become necessary to replace the lubricating oil or the bearing part of the main shaft may be damaged.

[0007] Therefore, the gyratory crusher is provided with a dust seal structure that continuously seals air inside the annular space, increasing the pressure in this space and preventing dust from entering the annular space from the crushing chamber. The dust seal structure includes a dust seal ring that separates the annular space from the crushing chamber. The dust seal ring is fitted into a partition plate attached to the frame of the frame assembly and is fixed in close contact with the outer wall of the partition plate. The dust seal ring is inserted into a fitting groove formed by a mantle core and a dust ring cover fixed thereto.

[0008] The dust seal ring rotates with the fitting groove as the main shaft rotates and slides around the partition plate. Therefore, when the rotary crusher is operated for a long period of time, the outer surface of the partition plate wears and the inner diameter of the dust seal ring wears down, gradually widening the gap between the partition plate and the dust seal ring. This causes the amount of air leaking from the annular space to increase, reducing the pressure difference between the annular space and the crushing chamber, making it easier for dust from the crushing chamber to enter the annular space through the gap.

[0009] Therefore, in order to maintain the functionality of the dust seal structure, maintenance work is periodically performed to check the condition (degree of wear) of the dust seal ring and determine whether it needs to be replaced. In this maintenance work, workers must visually check the condition of the dust seal ring. However, the dust seal ring is installed inside the gyratory crusher, and depending on the installation condition, it may be high up and in a dark place, so the maintenance work is very time-consuming for workers.

[0010] The present invention has been made in consideration of the above circumstances, and a main object of the present invention is to provide a gyratory crusher that can facilitate maintenance work on the dust seal ring. [Means for solving the problem]

[0011] The problem to be solved by the present invention has been described above. Next, the means for solving this problem and the effects thereof will be described.

[0012] According to a first aspect of the present invention, there is provided a gyratory crusher having the following configuration. That is, this gyratory crusher crushes objects to be crushed. The gyratory crusher includes a concave, an eccentric sleeve, a main shaft, a mantle, an oil chamber, a partition, a dust seal ring, a supply port, a pressure sensor, and a control unit. The concave is supported by a first support unit. The eccentric sleeve is rotatably supported by a second support unit. The main shaft is inserted into the eccentric sleeve and moves eccentrically due to the rotation of the eccentric sleeve. The mantle has a crushing unit facing the concave. The mantle moves eccentrically in association with the eccentric movement of the main shaft when attached to the main shaft. The oil chamber is provided around the main shaft below the mantle, and is filled with lubricating oil. The partition is provided around the oil chamber. The dust seal ring is disposed opposite the mantle and is provided around the partition portion, and together with the mantle and the partition portion, forms an annular space surrounding the main shaft. The pressure sensor detects the pressure in the annular space. The control unit obtains a pressure change amount in the annular space over time based on the pressure detected by the pressure sensor, and outputs information based on the pressure change amount.

[0013] According to a second aspect of the present invention, there is provided a dust seal ring wear state estimation method for a gyratory crusher, as follows. That is, the gyratory crusher includes a concave, an eccentric sleeve, a main shaft, a mantle, an oil chamber, a partition, and a dust seal ring. The concave is supported by a first support. The eccentric sleeve is rotatably supported by a second support. The main shaft is inserted into the eccentric sleeve and moves eccentrically due to the rotation of the eccentric sleeve. The mantle has a crushing part facing the concave, and moves eccentrically in association with the eccentric motion of the main shaft when attached to the main shaft. The oil chamber is provided around the main shaft below the mantle, and is filled with lubricating oil. The partition is provided around the oil chamber. The dust seal ring is disposed opposite the mantle and is provided around the partition portion, and together with the mantle and the partition portion forms an annular space surrounding the main shaft. The dust seal ring wear state estimation method includes a first step and a second step. In the first step, a pressure sensor detects the pressure in the annular space when gas is supplied to the annular space. In the second step, a wear state of the dust seal ring is estimated based on an amount of pressure change over time in the annular space acquired in the first step.

[0014] This makes it possible to estimate the condition (amount of wear) of the dust seal ring using the pressure in the annular space detected by the pressure sensor. Therefore, when performing maintenance work on the dust seal ring, it is possible to save the worker the trouble of visually checking the condition of the dust seal ring. This makes it possible to facilitate the maintenance work. Moreover, it is possible to improve the safety of the maintenance work. Effect of the Invention

[0015] According to the present invention, it is possible to provide a gyratory crusher that can facilitate maintenance work related to the dust seal ring and improve safety. [Brief description of the drawings]

[0016] [Figure 1] 1 is a schematic cross-sectional view showing a configuration of a gyrating crusher according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a block diagram showing a part of the electrical configuration of the gyratory crusher. [Diagram 3] FIG. 4 is a partially enlarged cross-sectional view showing the configuration of the periphery of an axially intermediate portion of a main shaft in a gyratory crusher. [Figure 4] 6 is a flowchart showing an example of a process of a control unit related to a dust seal ring. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Next, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a schematic cross-sectional view showing the configuration of a gyrating crusher 1 according to an embodiment of the present invention. Fig. 2 is a block diagram showing a part of the electrical configuration of the gyrating crusher 1.

[0018] The gyro crusher 1 shown in Fig. 1 is configured as a cone crusher that crushes rocks (materials to be crushed) such as raw ore into an appropriate grain size. The gyro crusher 1 includes an upper frame (first support part) 3, a lower frame (second support part) 4, a main shaft 5, a mantle 6, a cone cave 7, an eccentric sleeve 8, and a power transmission mechanism 9.

[0019] The upper frame 3 is hollow and opens both upward and downward. The lower frame 4 is hollow and opens upward. The lower frame 4 is disposed below the upper frame 3 and is connected to the upper frame 3 so that their internal spaces are continuous.

[0020] The main shaft 5 is a round bar-shaped member. The main shaft 5 is provided to extend in the vertical direction across the internal space of the upper frame 3 and the internal space of the lower frame 4. The main shaft 5 is disposed approximately in the center of each of the upper frame 3 and the lower frame 4.

[0021] The upper end of the main shaft 5 is rotatably supported by an upper bearing 11. The upper bearing 11 is configured as, for example, a spherical bearing, and is designed to be able to change the direction of the axis of the main shaft 5. The upper bearing 11 is supported by the upper frame 3 while being positioned approximately in the center of the upper frame 3.

[0022] The mantle 6 is disposed around the axial (vertical) middle portion of the main shaft 5 and is fixed to the axial middle portion of the main shaft 5. The mantle 6 has a mantle core 15 and a crushing portion 16.

[0023] The mantle core 15 is formed in a cone shape with a diameter increasing downward. The mantle core 15 is fixed to the middle of the main shaft 5 passing through the center thereof in the axial direction.

[0024] The crushing section 16 is formed in a conical cylindrical shape with a diameter increasing downward. The crushing section 16 is disposed so as to cover the mantle core 15 from above, and is fixed to the mantle core 15.

[0025] The concave 7 is formed in a conical cylindrical shape with a radial dimension increasing toward the bottom. The concave 7 is fixed to the inner periphery of the upper frame 3. The concave 7 is disposed so that its inner periphery faces the outer periphery of the crushing portion 16 of the mantle 6.

[0026] A crushing chamber 20 is formed between the inner peripheral surface of the concave 7 and the outer peripheral surface of the crushing portion 16 of the mantle 6. In the crushing chamber 20, the distance between the inner peripheral surface of the concave 7 and the outer peripheral surface of the crushing portion 16 of the mantle 6 gradually narrows downward.

[0027] The concave 7 and the crushing part 16 of the mantle 6 are the parts that act on the rocks to be crushed. Therefore, they are made of a hard material such as high manganese steel that is resistant to wear. In addition, the concave 7 and the crushing part 16 of the mantle 6 are detachably fixed to their respective fixing points so that they can be replaced when they become worn to a certain extent.

[0028] The eccentric sleeve 8 is a member formed in a cylindrical shape. The eccentric sleeve 8 is inserted into a cylindrical portion formed in the lower frame 4 below the mantle 6, and is disposed so that its axis extends in the vertical direction. The eccentric sleeve 8 is supported by the lower frame 4 so that it can rotate about its axis.

[0029] The axis of the cylindrical hole of the eccentric sleeve 8 is eccentric with respect to the axis of the eccentric sleeve 8. The lower side of the main shaft 5 is inserted into the eccentric sleeve 8 in a state in which the main shaft 5 is rotatable relative to the cylindrical hole of the eccentric sleeve 8. A bush is disposed between the main shaft 5 and the inner peripheral surface of the cylindrical hole of the eccentric sleeve 8.

[0030] The power transmission mechanism 9 transmits power for rotating the eccentric sleeve 8 from a drive source (e.g., an electric motor) 23 to the eccentric sleeve 8. As shown in FIG. 2, the drive source 23 is connected to a control unit 25 of the gyratory crusher 1 and is controlled by the control unit 25. The power transmission mechanism 9 includes a horizontal shaft 31, a bevel pinion 32, and a bevel gear 33.

[0031] The horizontal shaft 31 is a round bar-shaped member. The horizontal shaft 31 is rotatably supported by the lower frame 4 via bearings with its rotation axis facing horizontally (laterally). Of both ends of the horizontal shaft 31, a bevel pinion 32 is fixed to the end located closer to the main shaft 5. The horizontal shaft 31 rotates by power transmitted from the drive source 23 via a V-belt, a V-pulley, etc.

[0032] The bevel gear 33 is fixed to the eccentric sleeve 8. The bevel gear 33 is provided so as to mesh with the bevel pinion 32. As a result, when the horizontal shaft 31 rotates, the power transmitted to the horizontal shaft 31 is transmitted from the bevel pinion 32 to the bevel gear 33, causing the bevel gear 33 to rotate. This causes the eccentric sleeve 8 to rotate.

[0033] In this configuration, when the eccentric sleeve 8 rotates, the main shaft 5 inserted into the cylindrical hole of the eccentric sleeve 8 rotates eccentrically. That is, the main shaft 5 rotates the lower part around the part supported by the upper bearing 11 while gradually changing the direction of its axis.

[0034] In this way, the main shaft 5 performs a pestle motion. The mantle 6 rotates so that the position of the crushing part 16 in a plan view varies periodically due to the pestle motion of the main shaft 5, so that the distance between the inner peripheral surface of the concave 7 and the outer peripheral surface of the crushing part 16, which face each other, repeatedly increases and decreases at a predetermined position in the circumferential direction.

[0035] At this time, the rocks can be crushed in the crushing chamber 20 formed between the inner peripheral surface of the concave 7 and the outer peripheral surface of the crushing section 16 of the mantle 6. That is, the rocks fed from the feed port 37 provided on the upper side of the upper frame 3 fall toward the crushing chamber 20, and are crushed by the action of the crushing section 16 (mantle 6) and the concave 7 while further falling in the crushing chamber 20.

[0036] Next, a description will be given of the configuration in the vicinity of the lower part of mantle 6. Fig. 3 is a partially enlarged cross-sectional view showing the configuration around the axial middle part of main shaft 5.

[0037] 3, below the mantle 6, an oil chamber 41 filled with lubricating oil is formed in an annular shape around the axially middle portion of the main shaft 5. The oil chamber 41 is composed of a groove-like portion formed by the eccentric sleeve 8 and a partition portion 44 (described later), etc. The lubricating oil filled in the oil chamber 41 lubricates the bearing portion between the main shaft 5 and the eccentric sleeve 8.

[0038] An annular space 42 is provided adjacent to the oil chamber 41. The annular space 42 is mainly formed by a part of the bottom of the mantle core 15, a partition 44, and a dust seal ring 45. The annular space 42 is disposed around the main shaft 5, and is separated from the crushing chamber 20 by the dust seal ring 45. Furthermore, air is sealed in the annular space 42, thereby blocking the intrusion of dust from the crushing chamber 20. Therefore, even if a large amount of dust such as crushed powder is generated in the crushing chamber 20, the lubricating oil in the oil chamber 41 can be prevented from being contaminated by the dust.

[0039] Specifically, the partition 44 is attached to the lower frame 4 so as to be located around the main shaft 5 below the mantle 6. The partition 44 has a partition tube 48 and a partition plate 49.

[0040] The partition cylinder 48 is formed in a cylindrical shape. The partition cylinder 48 is disposed so that its axial direction is along the up-down direction. The partition cylinder 48 is attached to the lower frame 4. The partition cylinder 48 is located around the oil chamber 41 and disposed on the outer circumferential side of the main shaft 5 at a predetermined distance in the radial direction from the main shaft 5.

[0041] The partition plate 49 is formed in an annular plate shape. The partition plate 49 is attached to the partition cylinder 48. The partition plate 49 is disposed coaxially with the partition cylinder 48 within the partition cylinder 48. The partition plate 49 is disposed between the main shaft 5 and the partition cylinder 48, above the eccentric sleeve 8 and the oil chamber 41.

[0042] A splash ring 51 is provided between the partition plate 49 and the main shaft 5. The splash ring 51 is located above (on the annular space 42 side) the bearing portion between the main shaft 5 and the eccentric sleeve 8, and is fitted to the main shaft 5. The splash ring 51 can prevent splashes of the lubricating oil in the oil chamber 41 from splashing toward the annular space 42 when the gyratory crusher 1 is in operation.

[0043] The inner peripheral side of the bottom of mantle core 15, which is the side closer to main shaft 5, is formed in a concave shape that opens downward. A visor portion 53 is provided on the outer peripheral edge of the bottom of mantle core 15.

[0044] A dust seal ring 45 is provided between the eaves portion 53 and the partition tube 48 of the partition portion 44. The dust seal ring 45 is formed in an annular shape. The dust seal ring 45 is disposed so as to face the bottom of the mantle core 15 and to rest on the dust ring cover 65, and is fitted into the partition tube 48 in a state of contact with the dust ring cover 65.

[0045] Thus, the annular space 42 is formed around the axially intermediate portion of the main shaft 5 mainly by a part of the bottom of the mantle core 15, the partition portion 44, and the dust seal ring 45. The dust seal ring 45 prevents dust from entering the annular space 42 from the crushing chamber 20 side.

[0046] A lubricating oil recovery passage (not shown) is connected to the oil chamber 41. The lubricating oil recovery passage is provided in the lower frame 4, and is composed of holes and piping in the lower frame 4. The lubricating oil stored in the oil chamber 41 is recovered through the lubricating oil recovery passage.

[0047] In addition, an air supply passage 60 is connected to the annular space 42. The air supply passage 60 is provided in the lower frame 4, and is configured by holes and piping in the lower frame 4. An air supply unit (supply unit) 62 is connected to the air supply passage 60. The air supply unit 62 is configured as, for example, a blower device. The air supply unit 62 can send air (gas) into the annular space 42 through the air supply passage 60.

[0048] The air supply passage 60 has a supply port 61 that opens into the annular space 42. The supply port 61 discharges air sent from the air supply unit 62 through the air supply passage 60 toward the annular space 42. The supply port 61 is disposed above the partition plate 49 and the splash ring 51 in the annular space 42.

[0049] As shown in Fig. 2, the air supply unit 62 is connected to the control unit 25 and is controlled by the control unit 25. The control unit 25 controls the air supply unit 62 to constantly supply a constant amount of air. This makes it possible to maintain an appropriate positive pressure inside the annular space 42 and prevent dust from entering the annular space 42 from the crushing chamber 20. Therefore, contamination of the lubricating oil can be reliably prevented.

[0050] In this embodiment, a dust ring cover 65 is provided for installation of the dust seal ring 45. The dust ring cover 65 is formed in an annular shape. The dust ring cover 65 is disposed below the inner periphery of the bottom of the mantle core 15. A predetermined gap is formed in the vertical direction between the part of the mantle core 15 that is close to the partition tube 48 and the dust ring cover 65. The dust ring cover 65 is attached to the inner periphery of the eaves portion 53 of the mantle core 15.

[0051] A retaining portion 67 is provided on the inner circumferential side of the bottom of the mantle core 15 in a portion facing the dust ring cover 65. The retaining portion 67 and the dust ring cover 65 form an annular groove that opens toward the partition tube 48. The dust seal ring 45 is disposed in this annular groove. The dust seal ring 45 is sandwiched between the retaining portion 67 and the dust ring cover 65 in a state where it is fitted to the outside of the partition tube 48. As a result, the dust seal ring 45 is retained by the partition tube 48, and is also retained by the mantle core 15 and the dust ring cover 65.

[0052] When the gyratory crusher 1 is in operation, the dust seal ring 45 rotates together with the main shaft 5 and slides against the partition tube 48. Therefore, if the gyratory crusher 1 is operated for a long period of time, the inner peripheral portion of the dust seal ring 45 wears and the gap between the partition tube 48 and the dust seal ring 45 gradually widens. This increases the amount of leakage of air sealed in the annular space 42, and the pressure (air sealing pressure) of the annular space 42 decreases. This makes it easier for dust from the crushing chamber 20 to enter the annular space 42.

[0053] As the wear of the dust seal ring 45 progresses, it becomes impossible to maintain airtightness. Therefore, the dust seal ring 45 needs to be replaced at an appropriate frequency. In consideration of this, the gyratory crusher 1 is provided with an estimation device for estimating the condition (amount of wear) of the dust seal ring 45.

[0054] Next, an estimation device for estimating the condition (amount of wear) of the dust seal ring 45 will be described.

[0055] The estimation device includes a pressure sensor 81 and an alarm unit 82. The estimation device further includes a control unit 25.

[0056] The pressure sensor 81 detects the pressure in the annular space 42. As shown in Fig. 2, the pressure sensor 81 is connected to the control unit 25. The control unit 25 controls the operation (particularly the detection timing) of the pressure sensor 81. The pressure sensor 81 transmits the detected pressure (detection value) to the control unit 25.

[0057] 3, the pressure sensor 81 is attached to the partition cylinder 48 of the partition portion 44 so as to face the annular space 42. The pressure sensor 81 is disposed above the splash ring 51 in the annular space 42, similar to the supply port 61 of the air supply passage 60.

[0058] The alarm unit 82 can generate an alarm. As shown in Fig. 2, the alarm unit 82 is connected to the control unit 25 and is controlled by the control unit 25. Specific examples of the alarm unit 82 include a lamp and a buzzer.

[0059] In this embodiment, the control unit 25, the driving source 23, the air supply unit 62, and the alarm unit 82 are disposed outside the frame (specifically, an assembly consisting of the upper frame 3 and the lower frame 4) of the gyratory crusher 1. On the other hand, the pressure sensor 81 is disposed inside the annular space 42. Although not shown, an appropriate signal cable is electrically connected to the pressure sensor 81. This signal cable is drawn out to the outside of the frame of the gyratory crusher 1 and connected to the control unit 25.

[0060] The control unit 25 acquires a detection value detected by the pressure sensor 81, and estimates a state of the dust seal ring 45 based on the acquired detection value. The control unit 25 has a memory unit 84, a calculation unit 85, and a determination unit 86.

[0061] The control unit 25 is configured as a known computer, and includes a CPU, a storage device, an input / output unit, and the like (not shown). The CPU can read out and execute various programs and the like from the storage device. Various programs and data are stored in the storage device. The above hardware and software can cooperate to cause the control unit 25 to operate as a storage unit 84, a calculation unit 85, and a determination unit 86.

[0062] The memory unit 84 prestores a predetermined threshold value. This threshold value relates to the amount of change in the pressure in the annular space 42 from a predetermined point in time.

[0063] If the dust seal ring 45 is new, the pressure in the annular space 42 can be easily increased by operating the air supply unit 62. On the other hand, if gaps have appeared in the dust seal ring 45 or the like due to wear and the airtightness has decreased, the air in the annular space 42 will leak through the gaps even if the air supply unit 62 is operated in the same way, and the pressure in the annular space 42 cannot be increased very much.

[0064] The above threshold value is appropriately set based on the relationship between the amount of pressure change in the annular space 42 and the amount of wear of the dust seal ring 45 .

[0065] Moreover, every time the control unit 25 acquires a detection value from the pressure sensor 81, the storage unit 84 stores the acquired detection value.

[0066] The calculation unit 85 acquires, as an initial value, the pressure in the annular space 42 in a state in which air is supplied to the annular space 42 by the air supply unit 62 when the dust seal ring 45 is not worn. After that, when the control unit 25 acquires a new detection value of the pressure sensor 81, the calculation unit 85 calculates the amount of pressure change in the annular space 42 over time based on the initial value and the newly acquired detection value.

[0067] The determination unit 86 compares the pressure change amount in the annular space 42 calculated by the calculation unit 85 with a threshold value stored in the memory unit 84, and determines whether the pressure change amount in the annular space 42 is greater than the threshold value. Based on the determination result of the determination unit 86, the control unit 25 estimates the state (amount of wear) of the dust seal ring 45.

[0068] When the determining unit 86 determines that the amount of pressure change is not greater than the threshold value, the control unit 25 estimates that the amount of wear of the dust seal ring 45 is within the allowable range. When the determining unit 86 determines that the amount of pressure change is greater than the threshold value, the control unit 25 estimates that the amount of wear of the dust seal ring 45 has exceeded the allowable range.

[0069] In this way, the control unit 25 monitors the pressure change in the annular space 42 using the pressure sensor 81, and estimates the state (amount of wear) of the dust seal ring 45 based on the judgment result of the judgment unit 86 at an appropriate timing. For example, in order to estimate the state (amount of wear) of the dust seal ring 45, the control unit 25 performs a process as shown in FIG.

[0070] The process performed by the control unit 25 will be described in detail with reference to Fig. 4. First, the control unit 25 acquires the pressure in the annular space 42 detected by the pressure sensor 81 at a timing when the dust seal ring 45 is not worn (step S101). This timing may be, for example, immediately after the gyratory crusher 1 is installed in a factory, or immediately after the dust seal ring 45 is replaced with a new one. The control unit 25 stores the acquired detection value in the storage unit 84 as an initial value.

[0071] It is preferable that the pressure sensor 81 detects the pressure in the annular space 42 when there is little pressure fluctuation and the mantle 6 and the concave 7 are unloaded (when no rocks are fed into the gyratory crusher 1) or when the crusher is stopped.

[0072] Next, when a predetermined time has elapsed since the previous pressure detection, the control unit 25 newly acquires a detection value at this time from the pressure sensor 81 (step S102). The control unit 25 stores the newly acquired detection value in the storage unit 84. Note that the predetermined time here can be set arbitrarily.

[0073] Next, the control unit 25 calculates the amount of pressure change in the annular space 42 over time based on the initial value and the detection value newly acquired in step S102 (step S103).

[0074] Next, the control unit 25 compares the amount of pressure change obtained in step S103 with a predetermined threshold value stored in the storage unit 84, and determines whether or not the amount of pressure change is larger than the threshold value (step S104).

[0075] When it is determined that the amount of pressure change is not larger than the threshold value (step S104, No), the control unit 25 determines that the amount of wear of the dust seal ring 45 is within the allowable range, and returns to step S102.

[0076] When it is determined that the pressure change amount is greater than the threshold value (step S104, Yes), the control unit 25 determines that the wear amount of the dust seal ring 45 is outside the allowable range, and causes the alarm unit 82 to generate an alarm (step S105). This alarm is to, for example, prompt the user to replace the dust seal ring 45.

[0077] 4 is a flowchart for implementing the dust seal ring wear state estimating method of the present invention. In this process, steps S101 and S102 correspond to a first step, and step S104 corresponds to a second step.

[0078] As described above, the gyratory crusher 1 of this embodiment crushes rocks. The gyratory crusher 1 includes the concave 7, the eccentric sleeve 8, the main shaft 5, the mantle 6, the oil chamber 41, the partition 44, the dust seal ring 45, the supply port 61, the pressure sensor 81, and the control unit 25. The concave 7 is supported by the upper frame 3. The eccentric sleeve 8 is rotatably supported by the lower frame 4. The main shaft 5 is inserted into the eccentric sleeve 8 and moves eccentrically due to the rotation of the eccentric sleeve 8. The mantle 6 has a crushing unit 16 facing the concave 7. The mantle 6, when attached to the main shaft 5, moves eccentrically in accordance with the eccentric movement of the main shaft 5. The oil chamber 41 is provided around the main shaft 5 below the mantle 6 and is filled with lubricating oil. The partition 44 is provided around the oil chamber 41. The dust seal ring 45 is disposed opposite the mantle 6 and is provided around the partition portion 44, and together with the mantle 6 and the partition portion 44, forms an annular space 42 surrounding the main shaft 5. The supply port 61 is for supplying air to the annular space 42. The pressure sensor 81 detects the pressure in the annular space 42. The control unit 25 obtains the amount of pressure change in the annular space 42 over time based on the pressure detected by the pressure sensor 81, and outputs information based on the amount of pressure change.

[0079] This makes it possible to estimate the state of the dust seal ring 45 using the change in pressure in the annular space 42 detected by the pressure sensor 81. Therefore, when performing maintenance work on the dust seal ring 45, the worker does not need to visually check the degree of wear of the dust seal ring 45. This makes it possible to facilitate the maintenance work. Moreover, since it is no longer necessary to visually check the degree of wear of the dust seal ring 45, the worker does not need to move inside the gyratory crusher 1 during the maintenance work, and the safety of the maintenance work can be improved.

[0080] In addition, in the gyratory crusher 1 of this embodiment, the control unit 25 acquires the pressure change amount based on the pressure detected by the pressure sensor 81 when the concave 7 and the mantle 6 are unloaded or stopped.

[0081] When the gyratory crusher 1 is actually performing crushing, there is a risk of the pressure in the annular space 42 fluctuating significantly. By avoiding such a situation and acquiring the amount of pressure change in the annular space 42, it is possible to make an accurate judgment regarding the necessity of replacing the dust seal ring 45, etc.

[0082] Furthermore, in the gyratory crusher 1 of this embodiment, the control unit 25 judges the wear-related state of the dust seal ring 45 based on the acquired pressure change amount in the annular space 42, and outputs the judgment result.

[0083] This allows, for example, an operator of the gyratory crusher 1 to easily know when it is time to replace the dust seal ring 45.

[0084] In the gyratory crusher 1 of this embodiment, when the control unit 25 determines that the acquired pressure change amount in the annular space 42 is greater than a predetermined threshold value, it determines that the dust seal ring 45 needs to be replaced.

[0085] This makes it possible to determine the necessity of replacing the dust seal ring 45 through a simple process.

[0086] In the gyro crusher 1 of this embodiment, a signal from the pressure sensor 81 is outputted to the outside of a frame (an assembly consisting of the upper frame 3 and the lower frame 4) that the gyro crusher 1 includes.

[0087] This allows an operator or the like to easily grasp the state of the dust seal ring 45 from the outside without having to access the inside of the gyratory crusher 1.

[0088] The gyrating crusher 1 of this embodiment is provided with an alarm unit 82 capable of generating an alarm in response to the output of the control unit 25.

[0089] This makes it possible to reliably prompt the operator or the like to replace the dust seal ring 45.

[0090] Although the preferred embodiment of the present invention has been described above, the above configuration can be modified, for example, as follows.

[0091] In the above embodiment, the control unit 25 causes the alarm unit 82 to issue an alarm once to prompt replacement of the dust seal ring 45 based on the pressure change amount in the annular space 42 and a predetermined threshold value, but the alarm unit 82 may be configured to issue an alarm multiple times depending on the pressure change amount in the annular space 42. In this case, an alarm can be issued every time the wear amount of the dust seal ring 45 changes to a preset amount (including the predetermined threshold value), so that the operator of the gyratory crusher 1 or the like can be informed of the detailed condition of the dust seal ring 45 (for example, a condition in which the time for replacement is approaching).

[0092] The control unit 25 may control the air supply unit 62 to change the amount of air supplied to the annular space 42 according to the pressure in the annular space 42. Specifically, the control unit 25 may control the air supply unit 62 to increase the amount of air supplied to the annular space 42 when the pressure in the annular space 42 drops. This makes it possible to reliably prevent dust from entering the annular space 42. In this case, the alarm unit 82 may be configured to issue an alarm when the pressure in the annular space 42 does not reach a predetermined value even if the amount of air supplied is increased to a certain extent.

[0093] The alarm unit 82 is not particularly limited, and may be any unit capable of generating a notification regarding the dust seal ring 45, such as a notification to prompt replacement of the dust seal ring 45.

[0094] The control unit 25 can output appropriate information obtained based on the amount of pressure change, instead of outputting the estimated state of the dust seal ring 45 (specifically, whether or not replacement is required), for example, the control unit 25 can display the estimated gap amount on a display, or can display the expected time when replacement will be required on a display.

[0095] The control unit 25 may display the amount of pressure change itself on a display. In this case, the operator can estimate the state of wear of the dust seal ring based on the value of the amount of pressure change displayed.

[0096] The control unit 25 can be configured to acquire the discharge pressure of the air supply unit 62 when the air supply unit 62 discharges air to send it into the annular space 42, and output information based on the pressure in the annular space 42 at that time and the acquired discharge pressure of the air supply unit 62. In this case, the control unit 25 is connected to a sensor that detects the discharge pressure of the air supply unit 62. The control unit 25 is configured to measure the discharge pressure of the air supply unit 62, calculate the pressure difference between the pressure in the annular space 42 at that time and the acquired discharge pressure of the air supply unit 62, and output information obtained based on the pressure difference between the two. This makes it possible to more accurately estimate the state of the dust seal ring 45.

[0097] For example, the control unit 25 acquires in advance a pressure difference that is normally expected when the device is normal (for example, the pressure difference when the gyratory crusher 1 is operating in a new condition) as a reference pressure difference. In this example, the pressure difference is the pressure of the annular space 42 subtracted from the discharge pressure of the air supply unit 62. In the process of operating the gyratory crusher 1, the control unit 25 periodically or irregularly acquires the discharge pressure of the air supply unit 62 and the pressure of the annular space 42, calculates the pressure difference, and compares it with the reference pressure difference.

[0098] The cause of the abnormality can be estimated by considering the change in the discharge pressure of the air supply unit 62 and the change in the pressure difference described above in a composite manner. For example, if the current pressure difference increases beyond the allowable range with respect to the reference pressure difference even though there is almost no change in the discharge pressure of the air supply unit 62, the control unit 25 determines that the pressure in the annular space 42 has decreased, and determines that there is a possibility that an abnormal state (damage, wear, etc.) has occurred in the dust seal ring 45, and outputs information on the determination. In this case, the cause of the change in the pressure difference may be air leakage from the air supply passage 60 due to damage to the piping that constitutes the air supply passage 60, and this content may be added to the output information. As another example, if the discharge pressure of the air supply unit 62 decreases beyond the allowable range with respect to the normal value, the control unit 25 determines that a failure has occurred in the air supply unit 62, and outputs information on the determination.

[0099] A control unit for estimating the wear state of the dust seal ring 45 may be disposed inside the annular space 42 together with the pressure sensor 81. In this case, it is preferable that a signal from the control unit is output to the outside of the frame of the gyratory crusher 1 by an appropriate signal cable.

[0100] In the above embodiment, the gyro crusher 1 is a so-called hydraulic cone crusher, but it may be a mechanical cone crusher.

[0101] Obviously many modifications and variations of the present invention are possible in light of the above teachings, and it is therefore to be understood that, within the scope of the appended claims, the invention may be practiced otherwise than as specifically described herein. [Explanation of symbols]

[0102] 1. Rotating crusher 3 Upper frame (first support part) 4 Lower frame (second support part) 5 main axis 6. Mantle 7 Cone Cave 8 Eccentric sleeve 16 Crushing section 25 Control Unit 41 Oil room 42 Annular Space 44 Partition 45 Dust seal ring 62 Air supply section (supply section) 81 Pressure Sensor 82 Alarm section

Claims

1. A gyratory crusher for crushing objects to be crushed, A concave supported by a first support portion; an eccentric sleeve rotatably supported by the second support portion; a main shaft that is inserted into the eccentric sleeve and moves eccentrically due to rotation of the eccentric sleeve; a mantle having a crushing portion facing the concave and attached to the main shaft, the mantle moving eccentrically in association with the eccentric motion of the main shaft; an oil chamber provided around the spindle below the mantle and filled with lubricating oil; A partition portion provided around the oil chamber; a dust seal ring disposed opposite the mantle, provided around the partition, and forming an annular space surrounding the main shaft together with the mantle and the partition; a supply port for supplying a gas to the annular space; a pressure sensor for detecting a pressure in the annular space; a control unit that acquires a pressure change amount in the annular space over time based on the pressure detected by the pressure sensor, and outputs information based on the pressure change amount; A gyratory crusher comprising:

2. The gyratory crusher according to claim 1, The control unit obtains the amount of pressure change based on pressure detected by a pressure sensor when the concave and the mantle are unloaded or stopped.

3. The gyratory crusher according to claim 1 or 2, The control unit determines a state regarding wear of the dust seal ring based on the acquired amount of pressure change in the annular space, and outputs a determination result.

4. The gyratory crusher according to any one of claims 1 to 3, The control unit determines that the dust seal ring needs to be replaced when the acquired pressure change amount in the annular space is greater than a predetermined threshold value.

5. The gyratory crusher according to any one of claims 1 to 4, A gyrating crusher, characterized in that a signal from the pressure sensor or a signal from the control unit is output to the outside of a frame provided in the gyrating crusher.

6. The gyratory crusher according to any one of claims 1 to 5, A gyratory crusher comprising an alarm unit capable of generating an alarm in response to an output from the control unit.

7. A gyratory crusher according to any one of claims 1 to 6, The supply port is connected to a supply portion that supplies gas to the annular space, The control unit controls the supply unit so that an amount of gas supplied to the annular space is changed depending on a pressure in the annular space.

8. A gyratory crusher according to any one of claims 1 to 6, The supply port is connected to a supply portion that supplies gas to the annular space, The control unit acquires the discharge pressure of the supply unit regarding the gas sent into the annular space, and outputs information based on the pressure in the annular space at that time and the acquired discharge pressure of the supply unit.

9. A concave supported by a first support portion; an eccentric sleeve rotatably supported by the second support portion; a main shaft that is inserted into the eccentric sleeve and moves eccentrically due to rotation of the eccentric sleeve; a mantle having a crushing portion facing the concave and attached to the main shaft, the mantle moving eccentrically in association with the eccentric motion of the main shaft; an oil chamber provided around the spindle below the mantle and filled with lubricating oil; A partition portion provided around the oil chamber; a dust seal ring disposed opposite the mantle, provided around the partition, and forming an annular space surrounding the main shaft together with the mantle and the partition; A dust seal ring wear state estimation method for estimating a wear state of the dust seal ring in a gyratory crusher comprising: a first step of detecting a pressure in the annular space by a pressure sensor when a gas is supplied to the annular space; a second step of estimating a state of wear of the dust seal ring based on an amount of pressure change in the annular space that changes over time, the amount of pressure change being acquired in the first step; A method for estimating a wear state of a dust seal ring, comprising:

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