Loading device of medium-speed coal mill

Abstract

The utility model provides a loading device of a medium-speed coal mill, which comprises a compression roller mounting frame and a hydraulic cylinder, the telescopic direction of the hydraulic cylinder is perpendicular to the horizontal plane, the loading device further comprises a loading force conduction mechanism capable of avoiding stress concentration, and the compression roller mounting frame is connected with the upper end of the hydraulic cylinder through the loading force conduction mechanism; the loading force transmission mechanism comprises a mounting groove and a loading block; the mounting groove is formed in the compression roller mounting frame and is provided with an upward opening, and the side wall of the mounting groove is obliquely upward; the loading block is arranged at the upper end of the hydraulic cylinder and can be driven by the hydraulic cylinder to reciprocate in the vertical direction, the loading block is installed in the installation groove, and a loading face attached to the side wall of the installation groove is arranged on the loading block. According to the utility model, the stress structure of the medium-speed coal mill can be improved, the service life of parts in the medium-speed coal mill is prolonged, and the reliability of safe operation of the medium-speed coal mill is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medium-speed coal mills, in particular to a loading device for medium-speed coal mills. Background Art

[0002] In the existing medium-speed coal mill, a loading device usually provides a grinding pressure that varies with the load (the amount of coal blocks on the grinding disc) for the pressure roller, and the pressure roller grinds the coal blocks on the grinding disc into coal powder under the action of the grinding pressure; the existing loading device includes a hydraulic cylinder, a pressure roller mounting frame and a tie rod pressure device, the hydraulic cylinder is used to output the grinding pressure, the pressure roller mounting frame is used to install the pressure roller, one end of the tie rod pressure device is installed on one end of the hydraulic cylinder, and the other end of the tie rod pressure device is installed on the pressure roller mounting frame, and is used to transmit the grinding pressure output by the hydraulic cylinder to the pressure roller mounting frame and the pressure roller, such as Figure 1 As shown, one end of the tie rod pressure device mounted on the pressure roller mounting frame includes a loading ring, and a ball bowl with an opening facing downward is arranged in the loading ring. Correspondingly, a crossbeam is installed on the pressure roller mounting frame, and a ball groove is opened on the upper surface of the crossbeam. A steel ball is slidably abutted in the ball groove, and the loading ring is mounted on the steel ball on the pressure roller mounting frame through the ball bowl.

[0003] Since the contact between the ball bowl and the steel ball is point-to-surface contact, the contact area between the two is small. Therefore, when the tie rod pressure device transmits the grinding pressure to the pressure roller mounting frame, the contact stress per unit contact area is large, and stress concentration is prone to occur. Stress concentration can cause damage to components at the connection between the tie rod pressure device and the pressure roller mounting frame, reduce the service life of components in the medium-speed coal mill, and also reduce the reliability of safe operation of the medium-speed coal mill. Utility Model Content

[0004] According to the technical problems raised above, a loading device for a medium-speed coal mill is provided. The utility model mainly utilizes the principle that the larger the contact area between two objects, the smaller the contact stress per unit contact area, and changes the point-to-surface contact structure in the loading device into a surface-to-surface contact structure, thereby improving the force structure of the medium-speed coal mill, increasing the service life of the components in the medium-speed coal mill, and improving the reliability of the safe operation of the medium-speed coal mill. The technical means adopted by the utility model are as follows:

[0005] A loading device for a medium-speed coal mill comprises a roller mounting frame and a hydraulic cylinder, wherein the extension and retraction direction of the hydraulic cylinder is perpendicular to the horizontal plane, and further comprises a loading force transmission mechanism capable of avoiding stress concentration, wherein the roller mounting frame is connected to the upper end of the hydraulic cylinder via the loading force transmission mechanism; the loading force transmission mechanism comprises a mounting groove and a loading block; the mounting groove is arranged on the roller mounting frame with an opening facing upward, and the side wall of the mounting groove is arranged to be inclined upward; the loading block is arranged at the upper end of the hydraulic cylinder and can make reciprocating motion in the vertical direction under the drive of the hydraulic cylinder, the loading block is installed in the mounting groove, and a loading surface is provided on the loading block which is in contact with the side wall of the mounting groove.

[0006] Furthermore, the loading force transmission mechanism also includes a thrust spherical bearing; the thrust spherical bearing includes a bearing outer ring and a bearing inner ring, the inner diameter surface of the bearing outer ring and the outer diameter surface of the bearing inner ring are both spherical surfaces, and the inner diameter surface of the bearing outer ring is in sliding contact with the outer diameter surface of the bearing inner ring; the bearing outer ring is installed on the pressure roller mounting frame, and the bearing inner ring is provided with the mounting groove.

[0007] Furthermore, the loading force transmission mechanism also includes a pull rod, the axial direction of the pull rod is consistent with the extension and contraction direction of the hydraulic cylinder; the loading block is installed at the upper end of the pull rod, the lower end of the pull rod is connected to the upper end of the hydraulic cylinder, and a first through hole is provided on the bottom surface of the mounting groove for the upper end of the pull rod to pass through.

[0008] Furthermore, the lower end of the pull rod is connected to the upper end of the hydraulic cylinder through a first connecting structure; the first connecting structure includes a first annular protrusion, a second annular protrusion and a first clamp that can fix the relative position between the first annular protrusion and the second annular protrusion, the first annular protrusion is wound around the side wall of the lower end of the pull rod, the second annular protrusion is wound around the side wall of the upper end of the hydraulic cylinder, the first clamp is a cylindrical structure, and a first annular groove is opened on the inner side wall of the first clamp along its circumferential direction, the first annular protrusion and the second annular protrusion are both installed in the first annular groove, the upper surface of the first annular groove is in contact with the upper surface of the first annular protrusion, and the lower surface of the first annular groove is in contact with the lower surface of the second annular protrusion.

[0009] Furthermore, the pull rod includes a first pull rod and a second pull rod, the axis of the first pull rod and the axis of the second pull rod are both perpendicular to the horizontal plane, the lower end of the first pull rod is connected to the upper end of the second pull rod through a second connecting structure; the second connecting structure includes a third annular protrusion, a fourth annular protrusion and a second clamp that can fix the relative position between the third annular protrusion and the fourth annular protrusion, the third annular protrusion is wound around the side wall of the lower end of the first pull rod, the fourth annular protrusion is wound around the side wall of the upper end of the second pull rod, the second clamp is a cylindrical structure, and a second annular groove is opened on the inner side wall of the second clamp along its circumferential direction, the third annular protrusion and the fourth annular protrusion are both installed in the second annular groove, the upper surface of the second annular groove is in contact with the upper surface of the third annular protrusion, and the lower surface of the second annular groove is in contact with the lower surface of the fourth annular protrusion.

[0010] Furthermore, the thrust spherical bearing outer sleeve is provided with a bearing protection shell, the lower end of the bearing protection shell is provided with a second through hole for the upper end of the pull rod to pass through, and a sealing device is provided between the side wall of the second through hole and the pull rod.

[0011] The utility model has the following advantages:

[0012] 1. The utility model includes a loading force transmission mechanism that can avoid stress concentration. The loading force transmission mechanism includes a mounting groove that is arranged on the pressure roller mounting frame and has an upward opening, and a loading block that is arranged at the upper end of the hydraulic cylinder and can reciprocate in the vertical direction under the drive of the hydraulic cylinder. The loading block is provided with a loading surface that fits the side wall of the mounting groove, that is, the contact mode between the loading block and the mounting groove is surface-to-surface contact. Compared with the point-to-surface contact between the ball bowl and the steel ball in the prior art, the contact area between the loading block and the mounting groove is larger. Therefore, when the loading block transmits the grinding pressure to the pressure roller mounting frame, the contact stress per unit contact area is smaller, and stress concentration is less likely to occur, thereby improving the force structure of the medium-speed coal mill, increasing the service life of the components in the medium-speed coal mill, and improving the reliability of the safe operation of the medium-speed coal mill.

[0013] 2. The utility model further includes a thrust spherical bearing, the bearing outer ring of the thrust spherical bearing is installed on the pressure roller mounting frame, and the mounting groove is provided on the bearing inner ring of the thrust spherical bearing, that is, the loading block is installed on the bearing inner ring of the thrust spherical bearing. When the pressure roller mounting frame shakes, the bearing inner ring and the loading block can rotate to a certain extent relative to the bearing outer ring and the pressure roller mounting frame, thereby avoiding damage to the loading force transmission mechanism due to the shaking of the pressure roller mounting frame.

[0014] 3. The utility model further includes a pull rod, the upper end of which is equipped with the loading block, and the lower end of the pull rod is connected to the upper end of the hydraulic cylinder through a first connecting structure; the first connecting structure includes a first annular protrusion, a second annular protrusion and a first clamp that can fix the relative position between the first annular protrusion and the second annular protrusion, the first clamp is in contact with the upper surface of the first annular protrusion, and is in contact with the lower surface of the second annular protrusion, forming a surface-to-surface contact structure, while in the prior art, the pull rod and the hydraulic cylinder are connected together by a threaded structure, which is weaker than the surface-to-surface contact structure and is prone to deformation, breakage, etc. Therefore, compared with the prior art, the connection between the pull rod and the hydraulic cylinder in the utility model is more stable.

[0015] 4. In the utility model, the pull rod includes a first pull rod and a second pull rod, and the lower end of the first pull rod is connected to the upper end of the second pull rod through a second connecting structure; the second connecting structure includes a third annular protrusion, a fourth annular protrusion and a second clamp that can fix the relative position between the third annular protrusion and the fourth annular protrusion, and the second clamp is in contact with the upper surface of the third annular protrusion and fits with the lower surface of the fourth annular protrusion, forming a surface-to-surface contact structure. In the prior art, the first pull rod and the second pull rod are connected together through a threaded structure, and the threaded structure is relatively weak compared to the surface-to-surface contact structure, and is prone to deformation, breakage, etc. Therefore, compared with the prior art, the connection between the first pull rod and the second pull rod in the utility model is more stable.

[0016] 5. In the utility model, the thrust spherical bearing outer sleeve is provided with a bearing protection shell, and a sealing device is provided between the second through hole on the bearing protection shell and the pull rod, which can effectively prevent external dust from entering the bearing protection shell and causing damage to the thrust spherical bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 It is an overall structural diagram of the tie rod pressurizing device and the cross beam in the prior art;

[0019] Figure 2 is an overall structural diagram of a loading device of a medium-speed coal mill in this embodiment;

[0020] Figure 3 This is the overall structural diagram of the loading block and the mounting slot in this embodiment.

[0021] Figure numerals: 1-pressure roller mounting frame; 2-top cover; 3-thrust spherical bearing; 4-sealing device; 5-first pull rod; 6-middle frame; 7-second clamp; 8-second pull rod; 9-first clamp; 10-lower frame; 11-hydraulic cylinder; 12-loading block; 13-loading surface; 14-mounting groove. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] like Figures 2 to 3 As shown, a loading device for a medium-speed coal mill includes a roller mounting frame 1 and a hydraulic cylinder 11, wherein the extension and retraction direction of the hydraulic cylinder 11 is perpendicular to the horizontal plane, and also includes a loading force transmission mechanism that can avoid stress concentration, wherein the roller mounting frame 1 is connected to the upper end of the hydraulic cylinder 11 through the loading force transmission mechanism; the loading force transmission mechanism includes a mounting groove 14 and a loading block 12; the mounting groove 14 is arranged on the roller mounting frame 1 and the opening faces upward, and the side wall of the mounting groove 14 is inclined upward; the loading block 12 is arranged at the upper end of the hydraulic cylinder 11 and can make reciprocating motion in the vertical direction under the drive of the hydraulic cylinder 11, the loading block 12 is installed in the mounting groove 14, and the loading block 12 is provided with a loading surface 13 that fits the side wall of the mounting groove 14.

[0024] Specifically, the loading block 12 is a truncated cone structure with an axis perpendicular to the horizontal plane and a top surface area larger than a bottom surface area. The loading surface 13 is a side wall of the loading block 12 , and the side wall of the mounting groove 14 fits with the side wall of the loading surface 13 .

[0025] Specifically, a lower frame 10 is disposed outside the hydraulic cylinder 11 , and the lower frame 10 protects the hydraulic cylinder 11 .

[0026] The contact mode between the loading block 12 and the mounting groove 14 is surface contact. Compared with the point-to-surface contact between the ball bowl and the steel ball in the prior art, the contact area between the loading block 12 and the mounting groove 14 is larger. Therefore, when the loading block 12 transmits the grinding pressure to the pressure roller mounting frame 1, the contact stress per unit contact area is smaller, and stress concentration is less likely to occur, thereby improving the force structure of the medium-speed coal mill, increasing the service life of components in the medium-speed coal mill, and improving the reliability of safe operation of the medium-speed coal mill.

[0027] In this embodiment, Figure 2 As shown, the loading force transmission mechanism also includes a thrust spherical bearing 3; the thrust spherical bearing 3 includes a bearing outer ring and a bearing inner ring, the inner diameter surface of the bearing outer ring and the outer diameter surface of the bearing inner ring are both spherical surfaces, and the inner diameter surface of the bearing outer ring is in sliding contact with the outer diameter surface of the bearing inner ring; the bearing outer ring is installed on the pressure roller mounting frame 1, and the bearing inner ring is provided with the mounting groove 14.

[0028] When the roller mounting frame 1 shakes, the inner ring of the bearing and the loading block 12 can rotate to a certain extent relative to the outer ring of the bearing and the roller mounting frame 1, thereby preventing the loading force transmission mechanism from being damaged due to the shaking of the roller mounting frame 1.

[0029] In this embodiment, Figure 2 As shown, the loading force transmission mechanism also includes a pull rod, the axial direction of the pull rod is consistent with the extension and retraction direction of the hydraulic cylinder 11; the loading block 12 is installed at the upper end of the pull rod, the lower end of the pull rod is connected to the upper end of the hydraulic cylinder 11, and a first through hole is provided on the bottom surface of the mounting groove 14 for the upper end of the pull rod to pass through.

[0030] In this embodiment, Figure 2 As shown, the lower end of the pull rod is connected to the upper end of the hydraulic cylinder 11 through a first connecting structure; the first connecting structure includes a first annular protrusion, a second annular protrusion and a first clamp 9 that can fix the relative position between the first annular protrusion and the second annular protrusion, the first annular protrusion is wound on the side wall of the lower end of the pull rod, the second annular protrusion is wound on the side wall of the upper end of the hydraulic cylinder 11, the first clamp 9 is a cylindrical structure, and a first annular groove is opened on the inner side wall of the first clamp 9 along its circumferential direction, the first annular protrusion and the second annular protrusion are both installed in the first annular groove, the upper surface of the first annular groove is in contact with the upper surface of the first annular protrusion, and the lower surface of the first annular groove is in contact with the lower surface of the second annular protrusion.

[0031] Specifically, the first clamp 9 includes a first clamp and a second clamp, both of which are semi-cylindrical structures, one end of the first clamp along its circumferential direction is connected to one end of the second clamp along its circumferential direction by screws, and the other end of the first clamp along its circumferential direction is connected to the other end of the second clamp along its circumferential direction by screws.

[0032] The first clamp 9 is in contact with the upper surface of the first annular protrusion and fits with the lower surface of the second annular protrusion, forming a surface-to-surface contact structure. In the prior art, the pull rod and the hydraulic cylinder 11 are connected together by a threaded structure. Compared with the surface-to-surface contact structure, the threaded structure is weaker and is prone to deformation and breakage. Therefore, compared with the prior art, the connection between the pull rod and the hydraulic cylinder 11 in this embodiment is more stable.

[0033] In this embodiment, Figure 2 As shown, the pull rod includes a first pull rod 5 and a second pull rod 8, the axis of the first pull rod 5 and the axis of the second pull rod 8 are both perpendicular to the horizontal plane, and the lower end of the first pull rod 5 is connected to the upper end of the second pull rod 8 through a second connecting structure; the second connecting structure includes a third annular protrusion, a fourth annular protrusion and a second clamp 7 that can fix the relative position between the third annular protrusion and the fourth annular protrusion, the third annular protrusion is wound on the side wall of the lower end of the first pull rod 5, and the fourth annular protrusion is wound on the side wall of the upper end of the second pull rod 8, the second clamp 7 is a cylindrical structure, and a second annular groove is opened on the inner side wall of the second clamp 7 along its circumferential direction, the third annular protrusion and the fourth annular protrusion are both installed in the second annular groove, the upper surface of the second annular groove is in contact with the upper surface of the third annular protrusion, and the lower surface of the second annular groove is in contact with the lower surface of the fourth annular protrusion.

[0034] Specifically, the upper end of the first pull rod 5 is the upper end of the pull rod, and the loading block 12 is installed thereon. The lower end of the second pull rod 8 is the lower end of the pull rod, and is connected to the upper end of the hydraulic cylinder 11 .

[0035] Specifically, the second clamp 7 includes a third clamp and a fourth clamp, and the third clamp and the fourth clamp are both semi-cylindrical structures. One end of the third clamp along the circumferential direction is connected to one end of the fourth clamp along the circumferential direction by screws, and the other end of the third clamp along the circumferential direction is connected to the other end of the fourth clamp along the circumferential direction by screws.

[0036] The second clamp 7 is in contact with the upper surface of the third annular protrusion and fits with the lower surface of the fourth annular protrusion, forming a surface-to-surface contact structure. In the prior art, the first pull rod 5 and the second pull rod 8 are connected together by a threaded structure. Compared with the surface-to-surface contact structure, the threaded structure is relatively weak and prone to deformation and breakage. Therefore, compared with the prior art, the connection between the first pull rod 5 and the second pull rod 8 in this embodiment is more stable.

[0037] In this embodiment, Figure 2As shown, the thrust spherical bearing 3 is provided with a bearing protection shell on its outer sleeve, the lower end of the bearing protection shell is provided with a second through hole for the upper end of the pull rod to pass through, and a sealing device 4 is provided between the side wall of the second through hole and the pull rod.

[0038] Specifically, the bearing protection shell includes a shell with an open upper end and a closed lower end. The opening at the upper end of the shell is detachably covered with a top cover 2. The sealing device 4 includes a special-shaped sealing ring, on which felt is installed, which can effectively prevent external dust from entering the bearing protection shell and causing damage to the thrust spherical bearing 3.

[0039] Specifically, a middle frame body 6 sleeved outside the first pull rod 5 is installed at the lower end of the bearing protection housing, and the middle frame body 6 plays a role in protecting the first pull rod 5.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A loading device for a medium-speed coal mill, comprising a roller mounting frame (1) and a hydraulic cylinder (11), wherein the extension direction of the hydraulic cylinder (11) is perpendicular to a horizontal plane, and characterized in that: It also includes a loading force transmission mechanism that can avoid stress concentration, and the pressure roller mounting frame (1) is connected to the upper end of the hydraulic cylinder (11) through the loading force transmission mechanism; The loading force transmission mechanism comprises a mounting groove (14) and a loading block (12); The mounting groove (14) is arranged on the pressure roller mounting frame (1) and has an opening facing upwards, and the side wall of the mounting groove (14) is arranged to be inclined upwards; The loading block (12) is arranged at the upper end of the hydraulic cylinder (11) and can perform reciprocating motion in the vertical direction under the drive of the hydraulic cylinder (11); the loading block (12) is installed in the installation groove (14); and the loading block (12) is provided with a loading surface (13) that is in contact with the side wall of the installation groove (14).

2. A loading device for a medium speed coal mill according to claim 1, characterized in that: The loading force transmission mechanism further comprises a thrust spherical bearing (3); The thrust spherical bearing (3) comprises a bearing outer ring and a bearing inner ring, the inner diameter surface of the bearing outer ring and the outer diameter surface of the bearing inner ring are both spherical surfaces, and the inner diameter surface of the bearing outer ring is in sliding contact with the outer diameter surface of the bearing inner ring; The outer ring of the bearing is mounted on the pressure roller mounting frame (1), and the inner ring of the bearing is provided with the mounting groove (14).

3. The loading device for a medium-speed coal mill according to claim 1, characterized in that: The loading force transmission mechanism further comprises a pull rod, the axis direction of which is consistent with the extension and contraction direction of the hydraulic cylinder (11); The loading block (12) is installed at the upper end of the pull rod, the lower end of the pull rod is connected to the upper end of the hydraulic cylinder (11), and a first through hole is provided on the bottom surface of the installation groove (14) for the upper end of the pull rod to pass through.

4. A loading device for a medium speed coal mill according to claim 3, characterized in that: The lower end of the pull rod is connected to the upper end of the hydraulic cylinder (11) via a first connecting structure; The first connection structure comprises a first annular protrusion, a second annular protrusion and a first clamp (9) capable of fixing the relative position between the first annular protrusion and the second annular protrusion, the first annular protrusion is arranged on the side wall of the lower end of the pull rod, the second annular protrusion is arranged on the side wall of the upper end of the hydraulic cylinder (11), the first clamp (9) is a cylindrical structure, and a first annular groove is provided on the inner side wall of the first clamp (9) along its circumferential direction, the first annular protrusion and the second annular protrusion are both installed in the first annular groove, the upper surface of the first annular groove is in contact with the upper surface of the first annular protrusion, and the lower surface of the first annular groove is in contact with the lower surface of the second annular protrusion.

5. The loading device for a medium-speed coal mill according to claim 3, characterized in that: The pull rod comprises a first pull rod (5) and a second pull rod (8), the axis of the first pull rod (5) and the axis of the second pull rod (8) are both perpendicular to a horizontal plane, and the lower end of the first pull rod (5) is connected to the upper end of the second pull rod (8) via a second connecting structure; The second connection structure comprises a third annular protrusion, a fourth annular protrusion and a second clamp (7) capable of fixing the relative position between the third annular protrusion and the fourth annular protrusion, the third annular protrusion is wound around the side wall of the lower end of the first pull rod (5), the fourth annular protrusion is wound around the side wall of the upper end of the second pull rod (8), the second clamp (7) is a cylindrical structure, and a second annular groove is provided on the inner side wall of the second clamp (7) along its circumferential direction, the third annular protrusion and the fourth annular protrusion are both installed in the second annular groove, the upper surface of the second annular groove is in contact with the upper surface of the third annular protrusion, and the lower surface of the second annular groove is in contact with the lower surface of the fourth annular protrusion.

6. The loading device for a medium-speed coal mill according to claim 2, characterized in that: The thrust spherical bearing (3) is provided with a bearing protection shell on its outer sleeve, a second through hole is provided at the lower end of the bearing protection shell for the upper end of the pull rod to pass through, and a sealing device (4) is provided between the side wall of the second through hole and the pull rod.

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