Crusher for mine collection work

Abstract

The invention relates to the field of crushers, in particular to a crusher for mine collection work, which can directly dissipate heat of a main shaft in the working process, and meanwhile, by matching with the arrangement of a heat sensing unit, the air inflow can be regulated and controlled in time according to the heating condition of the main shaft, so that effective heat dissipation under the condition of low energy consumption is realized, and the service life of the main shaft is prolonged. Therefore, it is effectively guaranteed that the spindle is not prone to excessive high temperature in the working period, the abrasion of the spindle is delayed and inhibited to a certain extent, the service life of the spindle is prolonged, meanwhile, under the arrangement of the run-out monitoring unit, the rotating state of the spindle can be monitored, the situation can be found in the early stage of shaft run-out, and the working efficiency is improved. Therefore, workers can conveniently carry out abnormal maintenance in time, the phenomena of serious jumping, fracture and the like of the subsequent shaft are effectively avoided, and compared with maintenance when the shaft obviously jumps or fractures, the maintenance difficulty is greatly reduced, the maintenance time is greatly shortened, and the maintenance cost is reduced.

Description

Technical Field

[0001] The present invention relates to a crusher used for mining work, and in particular to a crusher used for mining work applied in the field of crushers. Background Art

[0002] Impact crusher, also known as impact crusher, is mainly used for processing materials that often need to be moved in metallurgy, chemical industry, building materials, hydropower, etc., especially for operations with mobile stones such as highways, railways, and hydropower projects. It can adopt various configurations according to the type of processed raw materials, scale and requirements of finished materials.

[0003] During the mining process, a large amount of stone needs to be processed, and the overall load of the breaker is large, which causes the crusher to be easily severely worn during use and causes heat. The heat treatment for this wear is generally concentrated on dissipating heat at the bearings. For example, the Chinese patent specification with publication number CN103707014A discloses a method for manufacturing a water-circulating cooled jaw crusher bearing seat, and the Chinese patent specification with publication number CN118088665B discloses a short shaft cooling device, a short shaft assembly and a crusher. However, when heated, in addition to the bearings, the main shaft will also experience a certain amount of thermal expansion, resulting in increased wear and even shaft runout, affecting the stable progress of the crushing operation. In severe cases, the shaft may even break, causing premature failure and a service life seriously lower than expected, resulting in an invisible increase in the cost of stone crushing. Summary of the Invention

[0004] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that when the stone is crushed, the load on the main shaft is large, and heat is generated due to wear, which reduces the service life of the main shaft and increases the cost investment.

[0005] In order to solve the above problems, the present invention provides a crusher for mining work, comprising a bracket, a housing with a control center and a motor fixedly connected to the upper end of the bracket, a breaker hammer installed in the housing through a bearing, a plurality of impact liners installed on the inner wall of the upper end of the housing and the inner wall away from the housing entrance, a screen installed on the bottom of the housing, the screen located below the breaker hammer and the plurality of impact liners, both ends of the main shaft at the center of the breaker hammer movably penetrate the housing and extend outside the housing, the output shaft of the motor and the end of the main shaft communicating with the output shaft of the motor are fixedly connected to pulleys, a belt is provided between the two pulleys, the other end of the main shaft located outside the housing is provided with a heat reduction cover, and the heat reduction cover is fixedly connected to the housing by a plurality of bolts;

[0006] The heat reduction cover includes a flange and a gas gathering shell fixedly connected to the outer end of the flange, the outer end of the gas gathering shell is fixedly connected to an air intake pipe, the air intake pipe is communicated with an external air source, a hole guard shell is provided on the outer sleeve of the end on the same side of the main shaft and the pulley, and the hole guard shell is located between the pulley and the outer wall of the shell, an exhaust hole is drilled at the outer end of the hole guard shell, a gas flow meter is installed on one of the exhaust holes, multiple air holes are drilled at the outer ends of both sides of the main shaft, a central air path is drilled inside the main shaft, the jump detection counterbore is communicated with the central air path, and multiple air holes on both sides are respectively located in the gas gathering shell and the hole guard shell, the multiple exhaust holes and the multiple air holes are staggered with each other, a thermal sensing unit is provided on the inner wall of the central air path near the bearing, and the thermal sensing unit and the gas flow meter are both connected to the control center signal.

[0007] In the above-mentioned crusher used for mining work, the main shaft can be directly cooled during the working process. At the same time, with the setting of the thermal sensing unit, it is convenient to adjust the air intake volume in time according to its heating conditions, thereby achieving effective heat dissipation under low energy consumption conditions, thereby effectively ensuring that the main shaft is not prone to excessive high temperature during operation, reducing its damage probability and extending its service life.

[0008] As a further improvement of the present application, the thermal sensing unit includes a thermal cohesive tube fixedly connected to the inner wall of the central gas path and two air sheets fixedly connected to the inner walls of the thermal cohesive tube respectively. The space enclosed by the convex surface of the air sheet and the inner wall of the thermal cohesive tube is filled with high thermal conductivity gas.

[0009] As a further improvement of the present application, when the machine is shut down and not working, the two air sheets are symmetrical to each other and do not touch each other. The space between them forms an air gap. The air sheets are made of elastically sealed high-temperature resistant material, and the thermal cohesive tube is made of high thermal conductivity material.

[0010] As a further improvement of the present application, an internal laser emitter is fixedly installed in the middle of one of the air sheets, and the internal laser emitter is located on the raised surface of the air sheet. A plurality of limiting protrusions are also fixedly connected on the raised surfaces of the two air sheets. The multiple limiting protrusions on the air sheet with the internal laser emitter are concentrated in the middle, and the distance between the limiting protrusion and the internal laser emitter is not greater than the diameter of the limiting protrusion.

[0011] As another improvement of the present application, a vibration monitoring unit is also provided at the end of the main shaft located in the gas gathering shell. The vibration monitoring unit includes a T-shaped plate fixedly connected to the gas gathering shell facing the middle of the main shaft and an external laser emitter installed in the middle of the T-shaped plate. A vibration measuring countersunk hole is also drilled at the end of the main shaft, and the light beam of the external laser emitter falls into the vibration measuring countersunk hole.

[0012] As another improved supplement to the present application, the external laser emitter, the breaker hammer and the bounce countersink are coaxially arranged, the cross-section of the bounce countersink is triangular, and the apex of the triangle is horizontally arranged, and the maximum span between the horizontal planes at the apex is within the allowable displacement range of the main axis.

[0013] As another improved supplement of the present application, one of the acute angles of the right triangle formed by the hypotenuse and the base of the bounce countersink is no greater than 30°.

[0014] A crusher for mining work, the use method of which comprises the following steps:

[0015] S1. When the shell mouth feed begins to crush the stone mined from the mine, the size of the air gap is monitored by the internal laser transmitter;

[0016] S2. When the air gap is lower than the preset standard, it means that the spindle is overheating. Low-temperature gas is introduced into the heat reduction cover through the air inlet pipe. The low-temperature gas enters the spindle through the air holes, passes through the spindle, and is discharged through the air holes on the other side to directly cool the spindle.

[0017] S3. Use a gas flow meter to detect the amount of gas discharged from the exhaust hole per unit time. When the detected data is lower than the threshold and the data detected by the internal laser emitter is greater than the threshold, the speed of introducing low-temperature gas is increased to expand the space of the gas gap, thereby maintaining efficient heat dissipation of the spindle;

[0018] S4, stopping the introduction of low-temperature gas at intervals. When the gas gap is too small, repeating steps S2-S3 again, thereby achieving intermittent heat dissipation for the spindle to reduce energy consumption;

[0019] S5. During steps S2-S4, the vibration monitoring unit synchronously monitors the dynamic balance of the main shaft in real time. When the main shaft is detected to have vibration, the low-temperature gas is controlled to continue to flow in until the machine is shut down or the staff starts maintenance.

[0020] In summary, the spindle can be directly cooled during operation, and with the setting of the thermal sensing unit, the air intake can be adjusted in time according to the heating situation, thereby achieving effective heat dissipation under low energy consumption conditions, thereby effectively ensuring that the spindle is not prone to excessive high temperature during operation, thereby delaying and inhibiting its wear, and extending the service life of the spindle. At the same time, under the setting of the vibration monitoring unit, the rotation state of the spindle can be monitored, and it can be detected in the early stage of shaft vibration, which makes it easier for staff to perform abnormal maintenance in time, effectively avoiding the occurrence of subsequent serious shaft vibration, fracture, etc. Compared with maintenance when the shaft is obviously vibrating or fractured, the difficulty of maintenance and the time required for maintenance are greatly reduced, thereby reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a perspective view of the first embodiment of the present application;

[0022] Figure 2 This is a rear perspective view of the first embodiment of the present application;

[0023] Figure 3 This is a front perspective stereogram of the first embodiment of the present application;

[0024] Figure 4 A partial perspective view of the main shaft according to the first embodiment of the present application;

[0025] Figure 5 A cross-sectional view of the main shaft portion of the first embodiment of the present application;

[0026] Figure 6 This is a partial schematic diagram of one end of the main shaft near the pulley according to the first embodiment of the present application;

[0027] Figure 7 This is a cross-sectional view of the thermal sensing unit of the first embodiment of the present application when not in operation;

[0028] Figure 8 This is a cross-sectional view of the heat sensing unit when the spindle is heating up according to the first embodiment of the present application;

[0029] Figure 9 This is a schematic diagram of the first embodiment of the present application when low-temperature gas is introduced to expand the gas gap;

[0030] Figure 10 This is a partial schematic diagram of a beat monitoring unit according to a second embodiment of the present application;

[0031] Figure 11 This is a partial schematic diagram of a spindle runout monitoring unit when the spindle is relatively stable according to the second embodiment of the present application;

[0032] Figure 12 This is a partial schematic diagram of a spindle runout monitoring unit in the early stage of spindle runout according to the second embodiment of the present application.

[0033] Description of the numbers in the figure:

[0034] 1 bracket, 2 motor, 21 pulley, 22 belt, 3 casing, 4 breaker, 401 spindle, 402 test sink hole, 403 air hole, 404 center air path, 5 impact liner, 6 screen, 7 heat reduction cover, 71 flange, 72 gas gathering shell, 73 hole protection shell, 701 air inlet pipe, 702 exhaust hole, 81 T-shaped plate, 82 external laser emitter, 91 heat cohesive tube, 92 air sheet, 93 limit protrusion, 901 internal laser emitter. DETAILED DESCRIPTION

[0035] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0036] The first implementation method:

[0037] Figure 1-3 The figure shows a crusher for mining work, including a bracket 1, a housing 3 with a control center and a motor 2 fixedly connected to the upper end of the bracket 1, a breaker 4 is installed in the housing 3 through a bearing, a plurality of impact liners 404 are installed on the inner wall of the upper end of the housing 3 and the inner wall away from the entrance of the housing 3, a screen 6 is installed at the bottom of the housing 3, the screen 6 is located below the breaker 4 and the plurality of impact liners 404, both ends of the main shaft 401 at the center of the breaker 4 are movable through the housing 3 and extend to the outside of the housing 3, the output shaft of the motor 2 and the end of the main shaft 401 that is connected to the output shaft of the motor 2 are fixedly connected with a belt The main shaft 401 is located outside the outer shell 3 and the other end thereof is covered with a heat reducing cover 7. The heat reducing cover 7 is fixedly connected to the outer shell 3 by a plurality of bolts. When in use, the mine stone passes through the mouth of the outer shell 3 into the crushing chamber therein, and is continuously impacted and crushed as the breaker 4 rotates. Part of the crushed stone rebounds to the impact liner 404, and is impacted and crushed again, so that the particle size of the stone is gradually reduced. Finally, through the joint action of the breaker 4 and the plurality of impact liners 404, the stone is crushed, and finally the stone that meets the requirements is discharged through the screen 6.

[0038] like Figure 4-5In the figure, a represents a bearing, b represents a heat sensing unit, the heat reduction cover 7 includes a flange 71 and a gas collecting shell 72 fixedly connected to the outer end of the flange 71, the outer end of the gas collecting shell 72 is fixedly connected to an air inlet pipe 701, the air inlet pipe 701 is communicated with an external air source, a hole-protecting shell 73 is provided on the outer sleeve of the end of the main shaft 401 on the same side as the pulley 21, and the hole-protecting shell 73 is located between the pulley 21 and the outer wall of the shell 3, an exhaust hole 702 is drilled on the outer end of the hole-protecting shell 73, a gas flow meter is installed on one of the exhaust holes 702, multiple air holes 403 are drilled on the outer ends of both sides of the main shaft 401, a central air path 404 is drilled inside the main shaft 401, and the jump detection sink hole 402 is connected to the central air path 404 are interconnected, and the multiple air holes 403 on both sides are respectively located in the gas gathering shell 72 and the hole protection shell 73, and the multiple exhaust holes 702 and the multiple air holes 403 are staggered with each other. When the main shaft 401 becomes hot during the stone crushing process of the device, low-temperature gas can be directly introduced into the heat reduction cover 7, and the low-temperature gas moves along the breaker 4 and is discharged after passing through the breaker 4, so as to achieve the effect of directly cooling the main shaft 401 from the inside, thereby effectively suppressing the serious heating and wear of the main shaft 401 caused by the overload of the breaker 4, thereby effectively ensuring that the main shaft 401 is not prone to excessive high temperature during operation, reducing its damage probability and extending its service life.

[0039] like Figure 5 and Figure 7 A thermal sensing unit is provided on the inner wall of the central gas path 404 near the bearing. The thermal sensing unit and the gas flow meter are both connected to the control center signal. The thermal sensing unit includes a thermal cohesive tube 91 fixedly connected to the inner wall of the central gas path 404 and two gas sheets 92 fixedly connected to the inner walls of the thermal cohesive tube 91. The space enclosed by the convex surface of the gas sheet 92 and the inner wall of the thermal cohesive tube 91 is filled with high thermal conductivity gas. When the data on the gas flow meter becomes smaller and the data on the internal laser emitter 901 becomes larger, it can be judged that the air gap becomes smaller, the air flow per unit time is small, and the heat dissipation effect is poor. At this time, the introduction of low-temperature gas can be accelerated to make more gas flow through the breaker 4 per unit time and take away more heat.

[0040] An internal laser emitter 901 is fixedly installed in the middle of one of the air pieces 92. The internal laser emitter 901 is located on the raised surface of the air piece 92. A plurality of limiting protrusions 93 are also fixedly connected to the raised surfaces of the two air pieces 92. The limiting protrusions 93 are mainly used for limiting, so that it is difficult for the air piece 92 to completely fit the thermal cohesive tube 91, thereby leaving a certain space between the two, so that the high thermal conductivity gas has a certain storage space. The multiple limiting protrusions 93 on the air piece 92 with the internal laser emitter 901 are concentrated in the middle, and the distance between the limiting protrusion 93 and the internal laser emitter 901 is not greater than the diameter of the limiting protrusion 93. When the two air pieces 92 are moved away from each other due to the injection and extrusion of the low-temperature gas, they can protect the internal laser emitter 901, making it difficult for it to conflict with the inner wall of the thermal cohesive tube 91, thereby effectively ensuring that it is not easily damaged.

[0041] When the shutdown is not working, such as Figure 7 The two air sheets 92 are symmetrical to each other and do not touch each other. The space between them forms an air gap. The air sheet 92 is made of elastic and sealed high-temperature resistant material. The thermal cohesive tube 91 is made of high thermal conductivity material. Figure 8 As the crusher starts working, the hammer 4 starts to heat up due to the continuous rotation friction, which makes the high thermal conductivity gas in the gas sheet 92 expand, and then makes the gas sheets 92 approach each other and collide. At this time, the internal laser emitter 901 moves to the center of the main shaft 401, and its data is at the maximum or close to the maximum. Combined with the re-inspection of the gas flow meter, it can be effectively judged that it is overheated, and the low-temperature gas can be introduced. Figure 9 , so that the two air sheets 92 are spread out away from each other and are not likely to block the low-temperature gas.

[0042] Second implementation method:

[0043] This embodiment is based on the first embodiment, and a beat monitoring unit is added. The rest of the parts remain the same as the first embodiment.

[0044] Figure 10 It is shown that a vibration monitoring unit is also provided at the end of the main shaft 401 located in the gas gathering shell 72. The vibration monitoring unit includes a T-shaped plate 81 fixedly connected to the gas gathering shell 72 facing the middle of the main shaft 401 and an external laser emitter 82 installed in the middle of the T-shaped plate 81. A vibration detection countersink 402 is also drilled at the end of the main shaft 401. The external laser emitter 82, the breaker 4 and the vibration detection countersink 402 are coaxially arranged so that when the breaker 4 is in normal state without vibration, the light beam of the external laser emitter 82 falls on the center point of the vibration detection countersink 402. If the shaft vibration occurs subsequently, regardless of the direction of the vibration, the appearance of the external laser emitter 82 can be changed, thereby timely identifying the abnormality.

[0045] like Figure 11The cross-section of the vibration measuring countersunk hole 402 is triangular, and the apex of the triangle is set horizontally. The maximum span between the horizontal planes at the apex is within the allowable displacement range of the main shaft 401. Within this range, the surface where the landing point of the external laser emitter 82 is located is horizontal, so that its data does not change. When it exceeds this range, the laser landing point will be on the inclined surface, and the data will fluctuate to a smaller level. Based on this, the effect of real-time monitoring of the early stage of the shaft vibration of the main shaft 401 is achieved.

[0046] like Figure 12 One of the acute angles of the right triangle formed by the hypotenuse and base of the jump measuring sink hole 402 is no more than 30°, so that the overall slope of the jump measuring sink hole 402 is relatively large. When a slight offset occurs, the data difference reflected on the slope will be relatively large, which effectively avoids the situation where the data of the external laser emitter 82 is ignored due to small fluctuations during monitoring.

[0047] A crusher for mining work, the use method of which comprises the following steps:

[0048] S1. When the shell 3 starts feeding the stone from the mine, the size of the air gap is monitored by the internal laser emitter 901.

[0049] S2. When the air gap is lower than the preset standard, it indicates that the main shaft 401 is overheating. Low-temperature gas is introduced into the heat reduction cover 7 through the air inlet pipe 701. The low-temperature gas enters the main shaft 401 through the air hole 403, passes through the main shaft 401, and is discharged through the air hole 403 on the other side, thereby directly cooling the main shaft 401. During this process, the two air sheets 92 are separated from each other and stretched, thereby increasing the air gap. At this time, the internal laser emitter 901 gradually decreases.

[0050] S3. The amount of gas discharged from the exhaust hole 702 per unit time is detected by a gas flow meter. When the detected data is lower than a threshold value and the data detected by the internal laser emitter 901 is greater than the threshold value, the speed of introducing the low-temperature gas is increased to expand the space of the gas gap, thereby maintaining efficient heat dissipation of the main shaft 401.

[0051] S4, stopping the introduction of low-temperature gas at intervals. When the gas gap is too small, repeating steps S2-S3 again, thereby achieving intermittent heat dissipation for the spindle 401 to reduce energy consumption;

[0052] S5. During steps S2-S4, the vibration monitoring unit synchronously monitors the dynamic balance of the main shaft 401 in real time. When the main shaft 401 is detected to have a vibration phenomenon, the low-temperature gas is controlled to continue to flow in until the machine is shut down or the staff starts maintenance.

[0053] In summary, the main shaft 401 can be directly cooled during operation, and with the setting of the thermal sensing unit, the air intake can be adjusted in time according to the heating situation, thereby achieving effective heat dissipation under low energy consumption conditions, thereby effectively ensuring that the main shaft 401 is not prone to excessive high temperature during operation, thereby delaying and inhibiting its wear to a certain extent, and extending the service life of the main shaft 401. At the same time, under the setting of the vibration monitoring unit, the rotation state of the main shaft 401 can be monitored, and it can be detected in the early stage of shaft vibration, thereby facilitating the staff to perform abnormal maintenance in time, effectively avoiding the occurrence of subsequent serious shaft vibration, fracture, etc. Compared with maintenance when the shaft is obviously vibrating or fractured, the maintenance difficulty and time required for maintenance are greatly reduced, thereby reducing maintenance costs.

[0054] In view of current actual needs, the protection scope of the above-mentioned implementation mode adopted in this application is not limited to this. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. A crusher for mining, characterized by: The invention comprises a bracket (1), wherein the upper end of the bracket (1) is fixedly connected to a housing (3) with a control center and a motor (2), a breaker hammer (4) is installed in the housing (3) through a bearing, a plurality of impact linings (404) are installed on the inner wall of the upper end of the housing (3) and the inner wall away from the entrance of the housing (3), a screen (6) is installed on the bottom of the housing (3), and the screen (6) is located below the breaker hammer (4) and the plurality of impact linings (404), both ends of the main shaft (401) at the center of the breaker hammer (4) are movable through the housing (3) and extend outside the housing (3), the output shaft of the motor (2) and the main shaft (401) and the output shaft of the motor (2) are fixedly connected to the outside of a pulley (21), a belt (22) is provided between the two pulleys (21), the other end of the main shaft (401) outside the housing (3) is provided with a heat reduction cover (7), and the heat reduction cover (7) is fixedly connected to the housing (3) by a plurality of bolts; The heat reduction cover (7) includes a flange (71) and a gas collecting shell (72) fixedly connected to the outer end of the flange (71), the outer end of the gas collecting shell (72) is fixedly connected to an air inlet pipe (701), and the air inlet pipe (701) is communicated with an external air source. A hole-protecting shell (73) is provided on the outer sleeve of one end of the main shaft (401) on the same side as the pulley (21), and the hole-protecting shell (73) is located between the pulley (21) and the outer wall of the housing (3). An exhaust hole (702) is drilled on the outer end of the hole-protecting shell (73), and a gas flow is installed on one of the exhaust holes (702). The gas flow meter comprises a plurality of air holes (403) on both outer ends of the main shaft (401), a central air path (404) is formed inside the main shaft (401), the jump detection sink hole (402) is connected to the central air path (404), and the plurality of air holes (403) on both sides are respectively located in the gas gathering shell (72) and the hole protection shell (73), the plurality of exhaust holes (702) and the plurality of air holes (403) are staggered with each other, and a thermal sensing unit is provided on the inner wall of the central air path (404) near the bearing, and the thermal sensing unit and the gas flow meter are both connected to the control center signal.

2. A crusher for mining according to claim 1, characterized in that: The thermal sensing unit comprises a thermal cohesive tube (91) fixedly connected to the inner wall of the central gas path (404) and two air sheets (92) respectively fixedly connected to the inner wall of the thermal cohesive tube (91), wherein the space enclosed by the convex surface of the air sheet (92) and the inner wall of the thermal cohesive tube (91) is filled with high thermal conductivity gas.

3. A crusher for mining according to claim 2, characterized in that: When the machine is stopped and not working, the two air sheets (92) are symmetrical to each other and do not touch each other, and the space between them forms an air gap. The air sheets (92) are made of elastically sealed high-temperature resistant material, and the thermal cohesive tube (91) is made of high thermal conductivity material.

4. A crusher for mining according to claim 3, characterized in that: An internal laser emitter (901) is fixedly installed in the middle of one of the air pieces (92), and the internal laser emitter (901) is located on the raised surface of the air piece (92). A plurality of limiting protrusions (93) are also fixedly connected to the raised surfaces of the two air pieces (92). The plurality of limiting protrusions (93) on the air piece (92) with the internal laser emitter (901) are concentrated in the middle, and the distance between the limiting protrusion (93) and the internal laser emitter (901) is not greater than the diameter of the limiting protrusion (93).

5. A crusher for mining according to claim 4, characterized in that: The end of the main shaft (401) located in the gas gathering shell (72) is also provided with a vibration monitoring unit, and the vibration monitoring unit includes a T-shaped plate (81) fixedly connected to the gas gathering shell (72) facing the middle of the main shaft (401) and an external laser emitter (82) installed in the middle of the T-shaped plate (81). The end of the main shaft (401) is also drilled with a vibration detection counterbore (402), and the light beam of the external laser emitter (82) falls into the vibration detection counterbore (402).

6. A crusher for mining according to claim 5, characterized in that: The external laser emitter (82), the breaker hammer (4) and the jump detection countersunk hole (402) are coaxially arranged, the cross section of the jump detection countersunk hole (402) is triangular, and the vertex of the triangular shaped is horizontally arranged, and the maximum span between the horizontal planes at the vertex is within the allowable displacement range of the main shaft (401).

7. A crusher for mining according to claim 5, characterized in that: One of the acute angles of the right triangle formed by the hypotenuse and the base of the tripping countersunk hole (402) is no greater than 30°.

8. A crusher for mining according to claim 7, characterized in that: The method of use includes the following steps: S1. When the shell (3) starts feeding the stone material mined from the mine, the size of the air gap is monitored by the internal laser emitter (901); S2. When the air gap is lower than the preset standard, it indicates that the main shaft (401) is seriously heated. Low-temperature gas is introduced into the heat reduction cover (7) through the air inlet pipe (701). The low-temperature gas enters the main shaft (401) along the air hole (403), passes through the main shaft (401), and is discharged along the air hole (403) on the other side, thereby directly cooling the main shaft (401). S3, detecting the amount of gas discharged from the exhaust hole (702) per unit time by a gas flow meter, and when the detected data is lower than a threshold value and the data detected by the internal laser emitter (901) is greater than the threshold value, accelerating the introduction speed of the low-temperature gas to expand the space of the gas gap, thereby maintaining efficient heat dissipation of the main shaft (401); S4, stopping the introduction of low-temperature gas at intervals, and when the gas gap is too small, repeating steps S2-S3 again, thereby achieving intermittent heat dissipation of the main shaft (401) to reduce energy consumption; S5. During the process of steps S2-S4, the vibration monitoring unit synchronously monitors the dynamic balance of the main shaft (401) in real time. When the main shaft (401) is detected to have a vibration phenomenon, the low-temperature gas is controlled to continue to be introduced until the machine is shut down or the staff starts maintenance.

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