Pull rod connecting structure of medium-speed coal mill

Abstract

The utility model relates to the technical field of coal mill pull rods, and discloses a medium-speed coal mill pull rod connecting structure which comprises an upper pull rod and a lower pull rod arranged on the lower portion of the upper pull rod. The connecting piece is arranged at the bottom of the upper pull rod and used for connecting the upper pull rod and the lower pull rod; the connecting clamping sleeve is arranged at the bottom of the lower pull rod and used for connecting the lower pull rod; the hydraulic rod is arranged at the bottom of the connecting clamping sleeve; the connecting piece comprises a threaded sleeve arranged between the upper pull rod and the lower pull rod and a threaded rod arranged on the outer side of the upper pull rod and the outer side of the lower pull rod. The upper pull rod and the lower pull rod are connected through the connecting piece with the internal threads, the diameter of the connecting position is not reduced, a 90-degree corner is omitted, loading force and impact force generated by vibration in the running process of the coal mill are not transmitted through a plane at the corner, and stress concentration metal fatigue fracture is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of pull rods for coal mills, in particular to a pull rod connection structure for a medium-speed coal mill. Background Art

[0002] The raw coal of some thermal power plants in Zhundong region has high water content, with the design value of 22-25% and the actual value of 28-30%. The water content shows an upward trend in winter when the temperature is low. At present, about 12% of coal gangue and kaolin are mixed to prevent coking on the heating surface. The Hastelloy grindability index of the coal entering the mill is lower than the original design value. When the design is 350MW, the primary air temperature is 365℃, and the actual operating air temperature is only 330℃, resulting in insufficient output of the coal mill. In order to meet the load demand, the output of the coal mill is increased by increasing the loading force.

[0003] However, increasing the loading force to increase the output of the coal mill will cause the vibration of the coal mill and frequent breakage of the tie rods. The diameter of the connection between the upper and lower tie rods of the coal mill is small and there is a 90° angle. The loading force and vibration during the operation of the coal mill will be transmitted through the corner, causing stress concentration and metal fatigue fracture at the corner. Utility Model Content

[0004] The utility model aims to provide a tie rod connection structure for a medium-speed coal mill to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a medium-speed coal mill tie rod connection structure, including an upper tie rod and a lower tie rod, wherein the lower tie rod is arranged at the lower part of the upper tie rod, and also includes a connecting piece arranged at the bottom of the upper tie rod for connecting the upper tie rod and the lower tie rod, a connecting sleeve arranged at the bottom of the lower tie rod for connecting the lower tie rod, a hydraulic rod arranged at the bottom of the connecting sleeve, and an oil pipe and a hydraulic cylinder arranged on the outside of the hydraulic rod for supplying oil to the hydraulic rod.

[0006] Preferably, the connecting member includes a threaded sleeve arranged between the upper pull rod and the lower pull rod, and a threaded rod arranged outside the upper pull rod and the lower pull rod.

[0007] Preferably, the connecting member further comprises a mounting block fixedly connected to the outer side of the threaded sleeve.

[0008] Preferably, a mounting seat is fixedly connected to the bottom of the hydraulic rod, and a mounting hole is provided inside the mounting seat.

[0009] Preferably, a support member is provided at the bottom of the hydraulic cylinder, including a support seat fixedly connected to the bottom of the hydraulic cylinder, a connecting rod fixed to the outside of the support seat, and a connecting sleeve fixed to the outside of the mounting seat, and the connecting rod is fixed inside the connecting sleeve.

[0010] Preferably, a top plate is fixedly connected to the outer side of the upper pull rod, and a locking nut is threadedly connected to the top.

[0011] Preferably, a rubber pad is sleeved on the outer side of the lower pull rod, and the rubber pad is clamped between the connecting sleeve and the lower pull rod.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0013] In the utility model, the upper pull rod and the lower pull rod are connected by an internal threaded connector, the diameter of the connection is not reduced, the 90° turning angle is eliminated, and the impact force generated by the loading force and vibration during the operation of the coal mill is not transmitted through the plane at the corner, thereby avoiding stress concentration and metal fatigue fracture. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A structural schematic diagram of a preferred embodiment of the tie rod connection structure for a medium-speed coal mill provided by the utility model;

[0015] Figure 2 A schematic diagram of the threaded sleeve structure provided by the utility model;

[0016] Figure 3 A schematic diagram of the upper pull rod structure provided by the utility model;

[0017] Figure 4 A schematic diagram of the lower pull rod structure provided by the utility model;

[0018] Figure 5 This is a schematic diagram of the support structure provided by the utility model.

[0019] In the figure: 1. upper pull rod; 2. lower pull rod; 3. connecting piece; 301. threaded sleeve; 302. threaded rod; 303. mounting block; 4. connecting sleeve; 5. hydraulic rod; 6. oil pipeline; 7. hydraulic cylinder; 8. mounting seat; 9. supporting piece; 901. connecting sleeve; 902. connecting rod; 903. supporting seat; 10. locking nut; 11. top plate; 12. rubber pad. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in 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.

[0021] See also Figure 1-5As shown, a medium-speed coal mill tie rod connection structure includes an upper tie rod 1 and a lower tie rod 2, wherein the lower tie rod 2 is arranged at the lower part of the upper tie rod 1, and also includes a connecting piece 3 arranged at the bottom of the upper tie rod 1 for connecting the upper tie rod 1 and the lower tie rod 2, a connecting sleeve 4 arranged at the bottom of the lower tie rod 2 for connecting the lower tie rod 2, a hydraulic rod 5 arranged at the bottom of the connecting sleeve 4, and an oil pipe 6 and a hydraulic cylinder 7 arranged on the outside of the hydraulic rod 5 for supplying oil to the hydraulic rod 5.

[0022] It should be noted that the upper pull rod 1 and the lower pull rod 2 are connected by an internal thread connector 3, the diameter of the connection is not reduced, the 90° angle is cancelled, and the impact force generated by the loading force and vibration during the operation of the coal mill is not transmitted through the plane at the corner, avoiding stress concentration and metal fatigue fracture.

[0023] refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the connecting member 3 includes a threaded sleeve 301 arranged between the upper pull rod 1 and the lower pull rod 2, and a threaded rod 302 arranged on the outer side of the upper pull rod 1 and the lower pull rod 2; the connecting member 3 also includes a mounting block 303 fixedly connected to the outer side of the threaded sleeve 301; the upper pull rod 1 and the lower pull rod 2 are respectively threadedly connected to the upper and lower parts of the threaded sleeve 301 using their own threaded rods 302, thereby connecting the upper pull rod 1 and the lower pull rod 2 together to avoid stress concentration and metal fatigue fracture.

[0024] refer to Figure 1 and Figure 5 As shown, the bottom of the hydraulic rod 5 is fixedly connected to a mounting seat 8, and a mounting hole is provided inside the mounting seat 8; a support member 9 is provided at the bottom of the hydraulic cylinder 7, including a support seat 903 fixedly connected to the bottom of the hydraulic cylinder 7, a connecting rod 902 fixed to the outside of the support seat 903, and a connecting sleeve 901 fixed to the outside of the mounting seat 8, and the connecting rod 902 is fixed inside the connecting sleeve 901; the hydraulic rod 5 is installed and fixed at a designated location using the mounting seat 8, the hydraulic cylinder 7 is fixed on the upper part of the support seat 903, and the support seat 903 is fixed to the inside of the connecting sleeve 901 using the connecting rod 902, thereby supporting and fixing the hydraulic cylinder 7.

[0025] refer to Figure 1 and Figure 3 As shown, the outer side of the upper pull rod 1 is fixedly connected with a top plate 11, and the top is threadedly connected with a locking nut 10; the outer side of the lower pull rod 2 is sleeved with a rubber pad 12, and the rubber pad 12 is clamped between the connecting sleeve 4 and the lower pull rod 2; the upper pull rod 1 is fixed by the top plate 11 and the locking nut 10, and the rubber pad 12 is set between the lower pull rod 2 and the connecting sleeve 4 to reduce the vibration of the pull rod.

[0026] Working principle: The upper pull rod 1 and the lower pull rod 2 are respectively threadedly connected to the upper and lower parts of the threaded sleeve 301 by their own threaded rods 302, thereby connecting the upper pull rod 1 and the lower pull rod 2 together to avoid stress concentration and metal fatigue fracture. The hydraulic rod 5 and the lower pull rod 2 are connected and fixed together by the connecting sleeve 4. The upper pull rod 1 and the lower pull rod 2 are connected by the internal thread connector 3. The diameter of the connection is not reduced, and the 90° angle is cancelled. The loading force and impact force generated by vibration during the operation of the coal mill are not transmitted through the plane at the corner, avoiding stress concentration and metal fatigue fracture.

[0027] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A tie rod connection structure for a medium-speed coal mill, comprising an upper tie rod (1) and a lower tie rod (2), Features: The lower pull rod (2) is arranged at the lower part of the upper pull rod (1), and also includes a connecting piece (3) arranged at the bottom of the upper pull rod (1) for connecting the upper pull rod (1) and the lower pull rod (2), a connecting sleeve (4) arranged at the bottom of the lower pull rod (2) for connecting the lower pull rod (2), a hydraulic rod (5) arranged at the bottom of the connecting sleeve (4), and an oil pipeline (6) and a hydraulic cylinder (7) arranged on the outside of the hydraulic rod (5) for supplying oil to the hydraulic rod (5); the connecting piece (3) includes a threaded sleeve (301) arranged between the upper pull rod (1) and the lower pull rod (2), and a threaded rod (302) arranged on the outside of the upper pull rod (1) and the lower pull rod (2).

2. A tie rod connection structure for a medium-speed coal mill according to claim 1, Features: The connecting member (3) also includes a mounting block (303) fixedly connected to the outside of the threaded sleeve (301).

3. A tie rod connection structure for a medium-speed coal mill according to claim 1, Features: The bottom of the hydraulic rod (5) is fixedly connected to a mounting seat (8), and a mounting hole is provided inside the mounting seat (8).

4. A tie rod connection structure for a medium-speed coal mill according to claim 3, Features: A support member (9) is provided at the bottom of the hydraulic cylinder (7), comprising a support seat (903) fixedly connected to the bottom of the hydraulic cylinder (7), a connecting rod (902) fixed to the outside of the support seat (903), and a connecting sleeve (901) fixed to the outside of the mounting seat (8), wherein the connecting rod (902) is fixed inside the connecting sleeve (901).

5. The tie rod connection structure of a medium-speed coal mill according to claim 1, Features: The outer side of the upper pull rod (1) is fixedly connected to a top plate (11), and the top is threadedly connected to a locking nut (10).

6. A tie rod connection structure for a medium-speed coal mill according to claim 1, Features: The outer side of the lower pull rod (2) is sleeved with a rubber pad (12), and the rubber pad (12) is clamped between the connecting sleeve (4) and the lower pull rod (2).

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