Coal mill spring loading device and monitoring method thereof

Abstract

The invention relates to the technical field of spring loading, in particular to a coal mill spring loading device and a monitoring method thereof.The coal mill spring loading device comprises a spring mounting seat, the rear end of the spring mounting seat is connected with a force transducer, and a rear loading spring seat and a front loading spring seat are inserted into the spring mounting seat; the front loading spring seat is located on the front side of the rear loading spring seat, and the force measuring sensor and the rear loading spring seat are connected through a bolt. Through the structural arrangement of the force sensor and the displacement sensor, real-time stress data and real-time displacement data in the loading operation process of the loading spring can be collected in real time, so that the running state of the loading spring is monitored in real time, the abnormal running condition of the coal mill is found in time, and the working efficiency of the coal mill is improved. Operation state monitoring of the coal mill can be further improved, and stable operation of the coal mill can be better served.

Description

Technical Field

[0001] The invention relates to the technical field of spring loading, and in particular to a spring loading device for a coal mill and a monitoring method thereof. Background Art

[0002] In the current coal mill field, spring loading is a major coal mill loading method. Spring loading is to use a spring to load the coal mill. In spring loading, the spring compression changes linearly with the thickness of the coal layer on the grinding bowl (i.e., the amount of coal fed), and the loading force changes automatically with the amount of coal fed.

[0003] In the prior art, for example, there is a Chinese invention patent with patent number CN201711034545.4 and the patent name is a spring loading device for a coal mill. Specifically, the invention includes a coal mill housing and a connecting plate, wherein the connecting plate is fixed to the coal mill housing, a through hole is formed on the connecting plate, a loading shaft is passed through the through hole, a protective cover is sleeved on the outer side of the loading shaft, a through hole is formed on the top of the protective cover, the loading shaft passes through the through hole of the protective cover and protrudes from the protective cover, a sealing device is provided at the outer end of the through hole of the protective cover, the end of the loading shaft is buried in the sealing device, and a pneumatic thrust device is provided on the top of the sealing device.

[0004] The above scheme uses spring preload to load the grinding roller bracket through the reaction force of the lever, so that the coal is ground between the grinding bowl and the grinding roller. At the same time, the distance between the grinding roller and the grinding bowl is guaranteed, and they will not contact and be damaged in the absence of coal, ensuring stable operation, simple maintenance and low maintenance cost.

[0005] However, the above-mentioned spring loading method does not have the ability to monitor the operating status, and cannot effectively and real-time understand the spring loading situation, so it is impossible to analyze and improve the operating condition of the coal mill, and it is impossible to detect changes in spring performance in time, affecting the normal and efficient operation of the coal mill.

[0006] Therefore, a coal mill spring loading device and a monitoring method thereof are proposed to solve the above-mentioned problems. Summary of the invention

[0007] Technical issues solved

[0008] In view of the above-mentioned shortcomings of the prior art, the present invention provides a coal mill spring loading device and a monitoring method thereof, which can solve the problem in the prior art that the spring loading of the coal mill cannot be monitored during operation.

[0009] Technical Solution

[0010] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0011] The present invention provides a coal mill spring loading device and a monitoring method thereof, comprising a spring mounting seat, a force measuring sensor being connected to the rear end of the spring mounting seat, a rear loading spring seat and a front loading spring seat being inserted inside the spring mounting seat, a loading block being connected to the side of the front loading spring seat facing the outside of the spring mounting seat, a loading bolt being connected to the side of the front loading spring seat facing the rear loading spring seat, the loading bolt being inserted inside the rear loading spring seat, and a loading spring being connected between the rear loading spring seat and the front loading spring seat; wherein, a rear cover is connected to the surface of the force measuring sensor, a displacement sensor is connected to the surface of the rear cover, a guide rod is connected to the displacement sensor, an opening is provided at the rear end of the loading bolt, the guide rod passes through the rear cover and is inserted in the opening, a magnetic ring is connected to the rear end of the loading bolt, and the magnetic ring is sleeved on the surface of the guide rod;

[0012] Furthermore, the force sensor is a ring sensor, and the displacement sensor is a magnetostrictive displacement sensor.

[0013] Furthermore, a mounting plate is provided on the front end surface of the spring mounting seat.

[0014] Furthermore, it also includes a vibration-absorbing structure for providing vibration-absorbing protection for the loading spring during the compression process, the surface of the spring mounting seat is provided with a groove, and the vibration-absorbing structure includes an insertion plate inserted in the groove on the surface of the spring mounting seat, and the surface of one end of the insertion plate inserted inside the spring mounting seat is connected to a second sleeve, the interior of the second sleeve is connected to a second piston rod through a buffer spring, and the surface of one end of the second piston rod located outside the second sleeve is connected to a support plate, and the support plate is arranged to be an arc-shaped structure.

[0015] Furthermore, the surface of the spring mounting seat is provided with a plurality of groups of slots which are equidistantly distributed circumferentially, and the vibration damping mechanisms are provided as a plurality of groups which are equidistantly distributed in the plurality of groups of slots.

[0016] Furthermore, a connecting pipe is connected to the surface of the plug plate.

[0017] Furthermore, a connecting pipe is connected to the surface of the rear cover, the other end of the connecting pipe is connected to a connected communicating vessel, and a plurality of groups of first sleeves distributed in equal distances are connected to the surface of the communicating vessel; wherein, the first sleeve is connected to the communicating vessel, the surface of the plug plate is connected to a first piston rod, and the first piston rod is adaptively inserted inside the first sleeve, the surface of the rear loading spring seat is connected to a fixing ring plate, the surface of the fixing ring plate is connected to an insert rod, the insert rod passes through the rear cover and is inserted inside the connecting pipe, and one end of the insert rod inserted in the connecting pipe is connected to a piston block.

[0018] Furthermore, the compensation mechanism includes a sealing plate connected and inserted in the communicating vessel, a return spring is connected to the surface of the sealing plate on the side facing away from the piston block, the other end of the return spring is connected to the inner wall of the communicating vessel, the surface of the communicating vessel is connected to a connected three-way pipe, one end of the three-way pipe is connected to the rear cover and a first one-way valve is provided at the connection, the other end of the three-way pipe is exposed to the outside and is connected to a second one-way valve, and the outer diameter of the front loading spring seat is matched with the inner diameter of the spring mounting seat.

[0019] The present invention also provides a method for monitoring a spring loading device of a coal mill, comprising the following steps:

[0020] Step 1: When the coal mill is working, a coal layer is formed on the grinding bowl, and the grinding roller device is lifted to act on the loading block. The loading block is forced to push the front loading spring seat to slide and squeeze the loading spring. The loading spring transmits the force to the force sensor through the rear loading spring seat. The force sensor collects the real-time force data of the loading spring when it is working;

[0021] Step 2: When the front loading spring seat slides, it will synchronously drive the loading bolt to slide, control the relative displacement of the magnetic ring on the surface of the guide rod, and the displacement length is the compressed length of the loading spring, so that a displacement signal is generated on the guide rod and collected by the displacement sensor, obtaining the real-time displacement data of the loading spring during operation.

[0022] Compared with the known public technology, the technical solution provided by the present invention has the following beneficial effects:

[0023] The present invention can collect real-time force data and real-time displacement data of the loading spring during the loading operation process through the structural setting of the force sensor and the displacement sensor, thereby realizing real-time monitoring of the running state of the loading spring, timely discovering abnormal running conditions of the coal mill, further improving the running state monitoring of the coal mill, and better serving the stable operation of the coal mill;

[0024] In this solution, through the structural setting of the vibration-absorbing mechanism, when the loading spring is compressed, the force on the loading spring is in a real-time dynamic change state, so the loading spring will produce a certain vibration during operation, which will cause the loading spring to shift in position, resulting in the loading spring being unable to evenly transmit force to the force sensor when compressed, further resulting in the force sensor monitoring the operating state of the loading spring. The vibration generated by the loading spring during operation can be reduced by the vibration-absorbing mechanism, and the loading spring can be prevented from being damaged by the load.

[0025] This solution uses the structural setting of the compensation mechanism. When the elasticity of the loading spring declines after long-term operation, the elastic force of the loading spring cannot control the front loading spring seat to slide outward to the maximum extent in the spring mounting seat, which further leads to insufficient loading force provided by the loading spring, causing the equipment to fail to operate normally. Through the setting of the compensation mechanism, when the elasticity of the loading spring declines, auxiliary supporting force is provided to the front loading spring seat, thereby ensuring the structural stability of the device state. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 is a schematic cross-sectional view of the overall structure in an embodiment of the present invention;

[0028] Figure 2 It is a schematic diagram of the external structure of the overall structure in an embodiment of the present invention;

[0029] Figure 3 It is a schematic diagram of the overall structure cut away in an embodiment of the present invention;

[0030] Figure 4 It is a schematic diagram of the installation of the buffer mechanism structure in an embodiment of the present invention;

[0031] Figure 5 Schematic diagram of the buffer mechanism structure in an embodiment of the present invention.

[0032] The numbers in the figure represent: 1. spring mounting seat; 2. force sensor; 3. rear loading spring seat; 4. loading bolt; 5. front loading spring seat; 6. loading block; 7. sealing seat; 8. mounting plate; 9. rear cover; 10. displacement sensor; 11. guide rod; 12. magnetic ring; 13. opening; 14. loading spring; 15. communicating vessel; 16. fixing ring plate; 17. insert rod; 18. piston block; 19. first sleeve; 20. first piston rod; 21. insert plate; 22. second sleeve; 23. buffer spring; 24. second piston rod; 25. support plate; 26. communicating pipe; 27. reset spring; 28. sealing plate; 29. ​​three-way pipe; 30. first one-way valve; 31. second one-way valve. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0034] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0036] In the description of this embodiment, the terms "upper", "lower", "left", "right", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplified operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0037] The present invention will be further described below in conjunction with the embodiments.

[0038] Example:

[0039] Please refer to the attached Figure 1-5 This scheme proposes a spring loading device for a coal mill, including a spring mounting seat 1 installed on the coal mill, and an integrally formed mounting plate 8 is provided on the surface of the spring mounting seat 1 on one side close to the coal mill. The spring mounting seat 1 can be fixed to the coal mill by bolts penetrating the mounting plate 8, thereby achieving the fixation of the device and facilitating disassembly and maintenance during use.

[0040] Specifically, a force sensor 2 is installed on one end of the spring mounting seat 1 away from the mounting plate 8. The force sensor 2 is in the form of an annular sensor. The outer ring of the force sensor 2 is installed on the spring mounting seat 1 by bolts, and the inner ring of the force sensor 2 is installed on the rear loading spring seat 3 inserted in the spring mounting seat 1 by bolts. A front loading spring seat 5 is also inserted and installed in the spring mounting seat 1. The front loading spring seat 5 is located at the front end of the rear loading spring seat 3. A loading bolt 4 is installed on the surface of the front loading spring seat 5 facing the rear loading spring seat 3. The other end of the loading bolt 4 is inserted in the rear loading spring seat 3.

[0041] At the same time, a loading spring 14 is sleeved and installed on the surface of the loading bolt 4 , one end of the loading spring 14 is connected to the surface of the rear loading spring seat 3 , and the other end of the loading spring 14 is connected to the surface of the front loading spring seat 5 .

[0042] The front loading spring seat 5 is pushed to the outside of the spring mounting seat 1 under the elastic force of the loading spring 14. A loading block 6 is connected to the surface of the front loading spring seat 5 facing the outside of the spring mounting seat 1. The loading block 6 penetrates the outside of the spring mounting seat 1. When the spring mounting seat 1 is installed on the coal mill through the mounting plate 8 and bolts, the loading block 6 will be pushed out under the elastic force of the loading spring 14.

[0043] When the loading block 6 contacts the surface of the coal seam on the grinding bowl and changes with the thickness of the coal seam on the grinding bowl, further under the action of the reaction force, it will push the loading block 6 connected to the front loading spring seat 5 and the loading bolt 4 to slide toward the inside of the spring mounting seat 1, and squeeze the loading spring 14, so that the loading force of the loading spring 14 automatically changes with the coal feed amount, and further the loading bolt 4 is forced to compress the loading spring 14, and the loading spring 14 will transfer the force to the rear loading spring seat 3, and the rear loading spring seat 3 will apply force to the force sensor 2 through the bolt, and the force sensor 2 will collect the real-time force data of the loading spring 14 when it is working, and further realize the real-time force monitoring of the loading spring 14 during the loading operation.

[0044] At the same time, a sealing seat 7 is installed at the opening of the surface of the spring mounting seat 1 near the loading block 6. The sealing seat 7 can seal the interior of the spring mounting seat 1 to prevent heat and dust from entering the interior of the spring mounting seat 1. As a result, the loading spring 14 is affected by high temperature during long-term operation, resulting in a decrease in the yield strength and tensile strength of the loading spring 14, which in turn causes the loading spring 14 to deform or break under load. Or the loading spring 14 is affected by dust, which may block the movement path of the loading spring 14 and affect its normal operation.

[0045] More specifically, a rear cover 9 is installed on the surface of the force sensor 2 by bolts, and the rear opening of the spring mounting seat 1 can be sealed by the rear cover 9, so as to further realize dustproof, waterproof and high temperature protection of the loading spring 14 inside the spring mounting seat 1. A displacement sensor 10 is installed on the surface of the rear cover 9, and the displacement sensor 10 adopts the form of a magnetostrictive displacement sensor. A guide rod 11 is connected to the displacement sensor 10, and the guide rod 11 passes through the interior of the rear cover 9.

[0046] The rear end surface of the loading bolt 4 is provided with an opening 13, and a magnetic ring 12 is installed inside the opening 13 through a bolt, and the guide rod 11 is inserted inside the magnetic ring 12. When the loading bolt 4 is further squeezed by force, the loading bolt 4 will drive the magnetic ring 12 to relatively displace on the surface of the guide rod 11, and the displacement length is the compressed length of the loading spring 14. Further, a displacement signal is generated on the guide rod 11, and the displacement sensor 10 collects the displacement signal, so that the real-time displacement data of the loading spring 14 when working can be monitored in real time.

[0047] Through the above-mentioned structural setting, during the operation of the device, the operating status of the loading spring 14 can be monitored in real time, and abnormal operation of the coal mill can be discovered in time, which can further improve the monitoring of the coal mill operation status and better serve the stable operation of the coal mill.

[0048] The difference is that a vibration damping mechanism is installed inside the spring mounting seat 1. When the loading spring 14 is compressed, the force on the loading spring 14 is in a real-time changing state. Therefore, the loading spring 14 will produce certain vibrations during operation, which will cause the loading spring 14 to shift in position. As a result, the loading spring 14 cannot evenly transfer force to the force sensor 2 when it is compressed, which further causes the force sensor 2 to monitor the operating status of the loading spring 14 uniformly.

[0049] The vibration generated by the loading spring 14 during operation can be reduced by the shock absorbing mechanism, and damage to the loading spring 14 due to the load can be avoided.

[0050] Specifically, the surface of the spring mounting seat 1 is provided with several groups of grooves that are equidistantly distributed in a circle, and the vibration-damping mechanisms are arranged as several groups that are equidistantly distributed in the several groups of grooves, so that the several groups of vibration-damping mechanisms are distributed inside the spring mounting seat 1, which can provide a more uniform vibration-damping effect for the loading spring 14, thereby maintaining the stability of the loading spring 14 during operation.

[0051] The vibration-absorbing structure includes an insert plate 21 inserted into a groove on the surface of the spring mounting seat 1. One end surface of the insert plate 21 inserted inside the spring mounting seat 1 is connected to a second sleeve 22. The interior of the second sleeve 22 is connected to a second piston rod 24 through a buffer spring 23. The end surface of the second piston rod 24 located outside the second sleeve 22 is connected to a support plate 25, and the support plate 25 is arranged as an arc-shaped structure.

[0052] When the loading block 6 is squeezed and pushes the front loading spring seat 5 and the loading bolt 4 to slide into the spring mounting seat 1, the front loading spring seat 5 will contact the surface of the support plate 25 after sliding for a distance, and further the front loading spring seat 5 will squeeze the support plate 25 while squeezing the loading spring 14, and push the second piston rod 24 to slide into the second sleeve 22 and squeeze the buffer spring 23, and further the compression of the loading spring 14 is slowed down by the buffer spring 23, so as to avoid the vibration of the loading spring 14 due to repeated compression. At the same time, it can prevent the loading spring 14 from being over-compressed, causing the loading spring 14 to be damaged in a loaded state.

[0053] More specifically, the surface of the rear cover 9 is connected with a connecting pipe 26, the other end of the connecting pipe 26 is connected with a communicating vessel 15, the surface of the communicating vessel 15 is connected with a plurality of first sleeves 19 distributed in equal distances, and the first sleeves 19 are connected with the communicating vessel 15. The surface of the insert plate 21 is connected with a first piston rod 20, which is inserted in the first sleeve 19. The surface of the rear loading spring seat 3 is connected with a fixed ring plate 16, the surface of the fixed ring plate 16 is connected with an insert rod 17, the insert rod 17 passes through the rear cover 9 and is inserted in the communicating pipe 26, and one end of the insert rod 17 inserted in the communicating pipe 26 is connected with a piston block 18.

[0054] When the loading bolt 4 is compressed and slides backward in the spring mounting seat 1, it pushes the plug rod 17 connected to the piston block 18 to slide into the connecting pipe 26, further squeezing the air inside the connecting vessel 15, increasing the air pressure in the connecting vessel 15 and the first sleeve 19, and further pushing the first piston rod 20 to slide outward in the first sleeve 19 under the action of the air pressure, so that the damping mechanism slides toward the side close to the front loading spring seat 5, thereby realizing the early buffering and vibration reduction of the loading spring 14 by the damping mechanism and avoiding excessive load of the loading spring 14. In this way, the protection capability of the loading spring 14 is increased.

[0055] It is worth noting that a compensation mechanism is also installed at the rear end of the spring mounting seat 1. When the elasticity of the loading spring 14 declines after a long period of operation, the elastic force of the loading spring 14 cannot control the front loading spring seat 5 to slide outward to the maximum extent in the spring mounting seat 1, further resulting in insufficient loading force provided by the loading spring 14, causing the device to fail to operate normally. By setting the compensation mechanism, when the elasticity of the loading spring 14 declines, auxiliary support force is provided to the front loading spring seat 5, thereby ensuring the structural stability of the device state.

[0056] Specifically, the compensation mechanism includes a sealing plate 28 connected and inserted in the communicating vessel 15, and a return spring 27 is connected to the surface of the sealing plate 28 on the side facing away from the piston block 18, and the other end of the return spring 27 is connected to the inner wall of the communicating vessel 15. A three-way pipe 29 is connected to the surface of the communicating vessel 15, and the connection is located at the rear side of the sealing plate 28. One end of the three-way pipe 29 is connected to the rear cover 9, and a first one-way valve 30 is provided at the connection, and the other end of the three-way pipe 29 is exposed to the outside and connected to a second one-way valve 31.

[0057] The sealing plate 28 is pushed to the side away from the connection between the tee pipe 29 and the communicating vessel 15 by the elastic force of the return spring 27. When the elasticity of the loading spring 14 decays, the front loading spring seat 5 cannot be pushed out of the spring mounting seat 1 by a sufficient length, causing the loading bolt 4 to slide into the spring mounting seat 1, further controlling the insertion rod 17 to connect the piston block 18 to squeeze the other parts in the communicating vessel 15.

[0058] At this time, the squeezing force of the piston block 18 on the communicating vessel 15 is smaller than the elastic force of the return spring 27, so the sealing plate 28 will not be pushed to move, and the air pressure in the communicating vessel 15 will further push the first piston rod 20 to slide in the first sleeve 19, and make the first sleeve 19 slide out of the first piston rod 20 to the maximum distance until the vibration damping mechanism slides to the front end in the groove on the surface of the spring mounting seat 1.

[0059] At this time, the damping mechanism is limited and blocked, and the first piston rod 20 cannot be pushed by the gas pressure, so that when the piston block 18 continues to squeeze the other parts in the communicating vessel 15, it will push the sealing plate 28 to compress the return spring 27. When the gas in the three-way pipe 29 is squeezed by the sealing plate 28, the gas cannot be discharged from the second one-way valve 31, and can only enter the rear cover 9 through the first one-way valve 30, further pressurizing the spring mounting seat 1.

[0060] The outer diameter of the front loading spring seat 5 is matched with the inner diameter of the spring mounting seat 1. When the air pressure in the spring mounting seat 1 increases, the rear end of the spring mounting seat 1 is sealed by the rear cover 9, and the air pressure in the spring mounting seat 1 further pushes the front loading spring seat 5 to slide outward in the spring mounting seat 1, and generates a pulling force on the loading spring 14. The attenuated elastic force of the loading spring 14 is compensated by the air pressure in the spring mounting seat 1, so that the loading spring 14 can provide a stable loading force to ensure the operation of the equipment. And when the front loading spring seat 5 slides forward, it will pull the plug rod 17 to slide in the opposite direction in the connecting pipe 26, further forming a negative pressure in the connecting vessel 15, and the three-way pipe 29 cannot draw air from the spring mounting seat 1, so that the three-way pipe 29 can only draw air from the second one-way valve 31 for compensation, thereby maintaining the pressurized state inside the spring mounting seat 1.

[0061] During the continuous operation of the loading spring 14, when the elasticity of the loading spring 14 continues to decline, the above steps will be repeated, and the spring mounting seat 1 will be continuously pressurized to compensate for the declining elasticity of the loading spring 14, thereby ensuring that the loading spring 14 provides a stable loading force.

[0062] At the same time, a connecting pipe 26 is connected to the surface of the plug plate 21, and the connecting pipe 26 covers the outer side of the groove on the surface of the spring mounting seat 1, so that the connecting pipe 26 can seal the groove on the surface of the spring mounting seat 1, thereby ensuring the sealing inside the spring mounting seat 1, and thus improving the stability of the operation of the compensation mechanism.

[0063] This embodiment also proposes a monitoring method for a coal mill spring loading device, comprising the following steps:

[0064] Step 1: When the coal mill is working, a coal layer is formed on the grinding bowl, and the grinding roller device is lifted to act on the loading block 6. The loading block 6 is forced to push the front loading spring seat 5 to slide and squeeze the loading spring 14. The loading spring 14 transmits the force to the force sensor 2 through the rear loading spring seat 3. The force sensor 2 collects the real-time force data of the loading spring 14 when it is working;

[0065] Step 2: When the front loading spring seat 5 slides, it will synchronously drive the loading bolt 4 to slide, control the magnetic ring 12 to undergo relative displacement on the surface of the guide rod 11, and the displacement length is the compressed length of the loading spring 14, so that a displacement signal is generated on the guide rod 11 and collected by the displacement sensor 10, thereby obtaining real-time displacement data of the loading spring 14 during operation.

[0066] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A spring loading device for a coal mill, characterized in that: The invention comprises a spring mounting seat (1), the rear end of which is connected to a force sensor (2), a rear loading spring seat (3) and a front loading spring seat (5) are inserted inside the spring mounting seat (1), a loading block (6) is connected to the side of the front loading spring seat (5) facing the outside of the spring mounting seat (1), a loading bolt (4) is connected to the side of the front loading spring seat (5) facing the rear loading spring seat (3), the loading bolt (4) is inserted inside the rear loading spring seat (3), and a loading spring (14) is connected between the rear loading spring seat (3) and the front loading spring seat (5); The surface of the force sensor (2) is connected to a rear cover (9), the surface of the rear cover (9) is connected to a displacement sensor (10), the displacement sensor (10) is connected to a guide rod (11), the rear end of the loading bolt (4) is provided with an opening (13), the guide rod (11) passes through the rear cover (9) and is inserted into the opening (13), the rear end of the loading bolt (4) is connected to a magnetic ring (12), and the magnetic ring (12) is sleeved on the surface of the guide rod (11).

2. A coal mill spring loading device according to claim 1, characterized in that: The force sensor (2) is a ring-shaped sensor, and the displacement sensor (10) is a magnetostrictive displacement sensor.

3. A coal mill spring loading device according to claim 1, characterized in that: A mounting plate (8) is provided on the front end surface of the spring mounting seat (1).

4. A coal mill spring loading device according to claim 1, characterized in that: The invention also comprises a vibration damping structure for providing vibration damping protection to the loading spring (14) during the compression process. The surface of the spring mounting seat (1) is provided with a groove. The vibration damping structure comprises an insert plate (21) inserted into the groove on the surface of the spring mounting seat (1). One end surface of the insert plate (21) inserted into the spring mounting seat (1) is connected to a second sleeve (22). The interior of the second sleeve (22) is connected to a second piston rod (24) via a buffer spring (23). One end surface of the second piston rod (24) located outside the second sleeve (22) is connected to a support plate (25). The support plate (25) is arranged as an arc-shaped structure.

5. A coal mill spring loading device according to claim 4, characterized in that: The surface of the spring mounting seat (1) is provided with a plurality of groups of slots which are equidistantly distributed circumferentially, and the vibration damping mechanisms are provided in a plurality of groups and are equidistantly distributed in the plurality of groups of slots.

6. A coal mill spring loading device according to claim 5, characterized in that: A connecting pipe (26) is connected to the surface of the insert plate (21).

7. A coal mill spring loading device according to claim 6, characterized in that: The surface of the rear cover (9) is connected to a connecting pipe (26), the other end of the connecting pipe (26) is connected to a communicating vessel (15), and the surface of the communicating vessel (15) is connected to a plurality of groups of first sleeves (19) distributed in equal distances from each other. The first sleeve (19) and the communicating vessel (15) are connected, the surface of the insert plate (21) is connected with a first piston rod (20), the first piston rod (20) is adaptively inserted in the first sleeve (19), the surface of the rear loading spring seat (3) is connected with a fixed ring plate (16), the surface of the fixed ring plate (16) is connected with an insert rod (17), the insert rod (17) passes through the rear cover (9) and is inserted in the communicating tube (26), and one end of the insert rod (17) inserted in the communicating tube (26) is connected with a piston block (18).

8. A coal mill spring loading device according to claim 7, characterized in that: The invention also comprises a compensation mechanism for providing a compensating force for the loading spring (14) when the elasticity decays, the compensation mechanism comprising a sealing plate (28) connected and inserted in the communicating vessel (15), a return spring (27) being connected to a surface of the sealing plate (28) facing away from the piston block (18), the other end of the return spring (27) being connected to the inner wall of the communicating vessel (15), a three-way pipe (29) being connected to the surface of the communicating vessel (15), one end of the three-way pipe (29) being connected to the rear cover (9) and a first one-way valve (30) being provided at the connection, the other end of the three-way pipe (29) being exposed to the outside and being connected to a second one-way valve (31), and the outer diameter of the front loading spring seat (5) being matched to the inner diameter of the spring mounting seat (1).

9. A method for monitoring a spring loading device of a coal mill according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: When the coal mill is working, a coal layer is formed on the grinding bowl, and the grinding roller device is lifted to act on the loading block (6). The loading block (6) is forced to push the front loading spring seat (5) to slide and squeeze the loading spring (14). The loading spring (14) transmits the force to the force sensor (2) through the rear loading spring seat (3). The force sensor (2) collects real-time force data of the loading spring (14) when it is working; Step 2: When the front loading spring seat (5) slides, it will synchronously drive the loading bolt (4) to slide, and control the magnetic ring (12) to have a relative displacement on the surface of the guide rod (11), and the displacement length is the compressed length of the loading spring (14), so that a displacement signal is generated on the guide rod (11) and collected by the displacement sensor (10), thereby obtaining real-time displacement data of the loading spring (14) during operation.

Images