Sealing device for pull rod of coal mill

Abstract

The utility model provides a coal mill pull rod sealing device. The coal mill pull rod sealing device comprises a sealing mechanism arranged at the joint of a pull rod and a coal mill; the sealing mechanism comprises a first elastic sealing sleeve and a second elastic sealing sleeve which sleeve the pull rod in an up-down sliding and sealing manner; the pull rod between the lower surface of the first elastic sealing sleeve and the bottom of the second elastic sealing sleeve is sleeved with a sealing box which is a preset distance away from the pull rod, and the peripheral wall of the first elastic sealing sleeve is connected with the upper surface of the sealing box through a first sealing cylinder; and the second elastic sealing sleeve is connected with the inner top surface and the inner bottom surface of the sealing box through two second sealing cylinders respectively. According to the coal mill, the good sealing effect is achieved, abrasion of the sealing mechanism to the pull rod is reduced, and therefore the service life of the pull rod is prolonged, coal powder and sealing air in the coal mill shell are prevented from leaking out of the coal mill shell as much as possible, and the coal milling environment is protected.

Description

Technical Field

[0001] The present application relates to the technical field of sealing, and in particular to a tie rod sealing device for a coal mill. Background Art

[0002] Coal mill is a machine that breaks coal blocks and grinds them into coal powder. It is an important auxiliary equipment of coal powder furnace. As the main equipment of coal mill loading system, the tie rod is the key sealing part of coal mill. Specifically, the tie rod needs to rotate along its own axis during use, accompanied by its own axial and radial displacement. In addition, the dust concentration in the working area where the tie rod is located is large, and the tensile stress is large, which makes the tie rod seal have high requirements for sealing. The tie rod seal is pulled up and down and pushed left and right between the coal mill housing and the tie rod. After the tie rod runs for a long time, a gap is generated between the coal mill housing and the tie rod shaft. The coal mill housing and the tie rod are both metal parts, that is, the connection between the two is rigid, which makes the connection between the two lack elasticity. In other words, the sealing between the two is poor, so that the tie rod will be worn during the operation of the tie rod. At the same time, the coal powder and sealing wind in the coal mill housing will leak out of the coal mill housing from the gap formed between the tie rod and the coal mill housing, causing environmental pollution. Utility Model Content

[0003] The present application provides a coal mill tie rod sealing device to solve the technical problems described in the above background technology.

[0004] In order to solve the above technical problems, this application adopts the following technical solutions:

[0005] The present application provides a coal mill tie rod sealing device, comprising: a sealing mechanism arranged at the connection between the tie rod and the coal mill;

[0006] The sealing mechanism includes a first elastic sealing sleeve and a second elastic sealing sleeve which are slidingly mounted on the pull rod; a sealing box which is a preset distance away from the pull rod is mounted on the pull rod between the lower surface of the first elastic sealing sleeve and the bottom of the second elastic sealing sleeve, the outer peripheral wall of the first elastic sealing sleeve is connected to the upper surface of the sealing box through a first sealing tube, and the second elastic sealing sleeve is respectively connected to the inner top surface and inner bottom surface of the sealing box through two second sealing tubes.

[0007] Optionally, the first elastic sealing sleeve is truncated cone-shaped, and the second elastic sealing sleeve is cylindrical.

[0008] Optionally, the first elastic sealing sleeve and the second elastic sealing sleeve are both made of synthetic rubber.

[0009] Optionally, a slide groove is provided on the inner circumferential wall of the first elastic sealing sleeve and the second elastic sealing sleeve, a slider is provided on the pull rod, and the slider is sealingly slidably connected to the slide groove.

[0010] Optionally, a first inner flange is provided on the inner peripheral wall of the first sealing sleeve near the top thereof, and the inner peripheral wall sealing sleeve of the first inner flange is provided on the outer peripheral wall of the first elastic sealing sleeve;

[0011] The outer top surface of the sealing box is provided with a first annular groove, the top of the first annular groove is provided with a first elastic baffle, the bottom of the first sealing tube passes through the first elastic baffle and is slidably arranged in the first annular groove, and the inner diameter of the first annular groove is greater than the thickness of the first sealing tube.

[0012] Optionally, a second inner flange is provided on the inner circumferential wall of one of the second sealing cylinders near the bottom and the inner circumferential wall of the other second sealing cylinder near the top, and the two second sealing cylinders are respectively sleeved on the outer circumferential wall of the second elastic sealing sleeve near the top and the outer circumferential wall of the second elastic sealing sleeve near the bottom through the second inner flanges provided thereon;

[0013] The inner top surface and the inner bottom surface of the sealing box are both provided with a second annular groove, and the top surfaces of the two second annular grooves are both provided with a second elastic baffle. The top of one of the second sealing tubes passes through the corresponding second elastic baffle and is slidably set in the corresponding second annular groove, and the bottom of the other second sealing tube passes through the corresponding second elastic baffle and is slidably set in the corresponding second annular groove, and the inner diameter of the second annular groove is greater than the thickness of the second sealing tube.

[0014] Optionally, an annular plate is provided on the peripheral wall of the sealing box close to the bottom surface thereof, and the annular plate is connected to the outer casing of the coal mill via fasteners.

[0015] The pulverizer rod sealing device provided by the present application forms a sealed chamber between the lower surface of the first elastic sealing sleeve, the upper surface of the second elastic sealing sleeve and the sealing box, thereby improving the sealing performance of the pull rod, and the sliding seal between the first elastic sealing sleeve and the second elastic sealing sleeve and the pull rod reduces the friction force on the pull rod during the up and down movement, and reduces the possibility of wear during the operation of the pull rod. In addition, the first elastic sealing sleeve and the second elastic sealing sleeve both have a certain elasticity and the sealing box is at a preset distance from the pull rod, thereby ensuring that the first elastic sealing sleeve and the second elastic sealing sleeve can be elastically deformed within the preset distance when the pull rod is subjected to the force of pushing left and right, and there will be no leakage between the pull rod and the first elastic sealing sleeve and the second elastic sealing sleeve. Therefore, the present application not only achieves a good sealing effect, but also reduces the wear of the sealing mechanism on the pull rod, thereby extending the service life of the pull rod, and avoids the leakage of coal powder and sealing wind in the coal mill housing to the outside of the coal mill housing as much as possible, thereby protecting the coal milling environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 A schematic structural diagram of a coal mill tie rod sealing device provided in one embodiment of the present application;

[0018] Figure 2 A schematic diagram of a structure in which a first elastic sealing sleeve and an inner peripheral wall of a second elastic sealing sleeve are both provided with a sliding groove and a sliding block is provided on a pull rod provided in an embodiment of the present application;

[0019] Figure 3 This is a structural schematic diagram of the first sealing cylinder and the second sealing cylinder provided in one embodiment of the present application being respectively connected to the sealing box.

[0020] In the figure: 100, pull rod; 200, coal mill; 300, sealing mechanism; 301, first elastic sealing sleeve; 302, second elastic sealing sleeve; 400, sealing box; 401, first annular groove; 4011, first elastic baffle; 402, second annular groove; 4021, second elastic baffle; 403, annular plate; 500, first sealing cylinder; 501, first inner flange; 600, second sealing cylinder; 601, second inner flange; 700, slide groove; 800, slider; 900, fastener. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application is clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work also fall within the scope of protection of the present application.

[0022] refer to Figures 1 to 3 The present application provides a coal mill tie rod sealing device, including: a sealing mechanism 300 arranged at the connection between the tie rod 100 and the coal mill 200, so that the sealing mechanism 300 can seal the connection between the tie rod 100 and the coal mill 200.

[0023] The sealing mechanism 300 includes a first elastic sealing sleeve 301 and a second elastic sealing sleeve 302 which are sliding seal sleeves arranged on the pull rod 100. A sealing box 400 which is a preset distance away from the pull rod 100 is sleeved on the pull rod 100 between the lower surface of the first elastic sealing sleeve 301 and the bottom of the second elastic sealing sleeve 302. The outer peripheral wall of the first elastic sealing sleeve 301 is connected to the upper surface of the sealing box 400 through a first sealing tube 500, and the second elastic sealing sleeve 302 is respectively connected to the inner top surface and inner bottom surface of the sealing box 400 through two second sealing tubes 600. Among them, by arranging the first elastic sealing sleeve 301 and the second elastic sealing sleeve 302, the sealing box 400 and the first sealing tube 500 and the second sealing tube 600 which are sleeved on the pull rod 100, a sealed chamber is formed between the lower surface of the first elastic sealing sleeve 301, the upper surface of the second elastic sealing sleeve 302 and the sealing box 400, thereby improving the sealing performance of the connection between the pull rod 100 and the outer casing of the coal mill 200, and the sliding seal between the first elastic sealing sleeve 301 and the second elastic sealing sleeve 302 and the pull rod 100 reduces the friction force exerted on the pull rod during the up and down movement, thereby reducing the possibility of wear of the pull rod 100 during operation. In addition, the first elastic sealing sleeve 301 and the second elastic sealing sleeve 302 both have a certain elasticity and the sealing box 400 is at a preset distance from the pull rod 100, thereby ensuring that when the pull rod 100 is pushed left and right, the first elastic sealing sleeve 301 and the second elastic sealing sleeve 302 can be elastically deformed within the preset distance (which can be set according to actual needs, and this application does not make specific restrictions on it) and no air leakage will occur between the pull rod 100 and the first elastic sealing sleeve 301 and the second elastic sealing sleeve 302.

[0024] It can be seen from this that the coal mill tie rod sealing device provided in the present application not only achieves a good sealing effect, but also reduces the wear of the sealing mechanism 300 on the tie rod 100, thereby extending the service life of the tie rod 100, and avoids the leakage of coal powder and sealing wind in the coal mill 200 casing to the outside of the coal mill 200 casing as much as possible, thereby protecting the coal grinding environment.

[0025] In some embodiments, reference Figure 1 , Figure 2 and Figure 3 In the present application, the first elastic sealing sleeve 301 is truncated cone-shaped, and the second elastic sealing sleeve 302 is cylindrical. The shapes of the first elastic sealing sleeve 301 and the second elastic sealing sleeve 302 are both convenient for connecting with the sealing box 400, and the height and width of the first elastic sealing sleeve 301 and the height and width of the second elastic sealing sleeve 302 can be set according to actual needs, so the present application does not specifically limit them.

[0026] In some embodiments, the first elastic sealing sleeve 301 and the second elastic sealing sleeve 302 in the present application are both made of synthetic rubber. Among them, synthetic rubber, also known as synthetic elastomer, is a highly elastic polymer synthesized by man, and is one of the three major synthetic materials. Since synthetic rubber has properties such as high elasticity, insulation, air tightness, oil resistance, high temperature or low temperature resistance, etc. Therefore, the first elastic sealing sleeve 301 and the second elastic sealing sleeve 302 made of synthetic rubber in the present application have good sealing performance and elastic deformation, so that the sealing performance between the pull rod 100 and the first elastic sealing sleeve 301 and the second elastic sealing sleeve 302 is good during the up and down movement or left and right movement. In addition, the production of synthetic rubber is not restricted by geographical conditions. From a traditional point of view, it is divided into two categories: general synthetic rubber and special synthetic rubber according to the performance, scope and quantity of synthetic rubber. It can be made into various rubber products through vulcanization processing. According to the chemical structure, it can be divided into olefins, dienes and elemental organics. Therefore, the specific category of synthetic rubber in the present application can be set according to actual conditions, and the present application does not further limit it here.

[0027] In some embodiments, reference Figure 2 In the present application, the inner circumferential walls of the first elastic sealing sleeve 301 and the second elastic sealing sleeve 302 are both provided with a slide groove 700, and the pull rod 100 is provided with a slider 800, and the slider 800 is sealed and slidably connected with the slide groove 700. Specifically, in order to improve the stability of the sealed sliding connection between the first elastic sealing sleeve 301 and the pull rod 100 and the stability of the sealed sliding connection between the second elastic sealing sleeve 302 and the pull rod 100, there can be multiple sliders 800 and multiple slide grooves 700, and the multiple sliders 800 correspond to the multiple slide grooves 700 one by one.

[0028] In the above embodiment, during the vertical up and down movement of the pull rod 100, the first elastic sealing sleeve 301 and the second elastic sealing sleeve 302 are slidably connected with the slider 800 provided on the rod body of the pull rod 100 through the slide groove 700 provided on themselves, thereby reducing the friction between the pull rod 100 and the first elastic sealing sleeve 301 and the second elastic sealing sleeve 302 during the up and down movement of the pull rod 100, avoiding wear of the pull rod 100 and the first elastic sealing sleeve 301 and the second elastic sealing sleeve 302 as much as possible, and improving the service life of the pull rod 100 and the first elastic sealing sleeve 301 and the second elastic sealing sleeve 302, thereby ensuring the sealing performance between the pull rod 100 and the first elastic sealing sleeve 301 and the second elastic sealing sleeve 302 during the up and down movement of the pull rod 100.

[0029] In some embodiments, reference Figure 3 The first sealing tube 500 in the present application is provided with a first inner flange 501 on the inner circumferential wall near the top thereof, and the inner circumferential wall sealing sleeve of the first inner flange 501 is provided on the outer circumferential wall of the first elastic sealing sleeve 301; wherein, the first inner flange 501 can be integrally formed with the first sealing tube 500.

[0030] The outer top surface of the sealing box 400 is provided with a first annular groove 401, the top of the first annular groove 401 is provided with a first elastic baffle 4011, the bottom of the first sealing cylinder 500 penetrates the first elastic baffle 4011 and is slidably arranged in the first annular groove 401, and the inner diameter of the first annular groove 401 is greater than the thickness of the first sealing cylinder 500. The first elastic baffle 4011 can be made of a synthetic rubber material with high elasticity, insulation, air tightness, oil resistance, high temperature or low temperature resistance, etc., so that the first elastic baffle 4011 can be ensured to have good sealing performance and elasticity.

[0031] In the above embodiment, during the radial movement of the pull rod 100, the pull rod 100 applies a radial extrusion force to the first elastic sealing sleeve 301, and the first elastic sealing sleeve 301 will apply a radial extrusion force to the first sealing tube 500 connected to its outer peripheral wall after receiving the radial extrusion force from the pull rod 100, and the first sealing tube 500 will apply a radial extrusion force to the first elastic baffle 4011 sealedly connected thereto after receiving the radial extrusion force from the first elastic sealing sleeve 301, and since the inner diameter of the first annular groove 401 is greater than the thickness of the first sealing tube 500, after the first sealing tube 500 is subjected to radial extrusion, the first sealing tube 500 and the first elastic baffle 4011 can still be in sealing contact, and the bottom of the first sealing tube 500 can move freely in the first annular groove 401, thereby ensuring the sealing between the pull rod 100 and the first elastic sealing sleeve 301 during the radial movement of the pull rod 100.

[0032] In some embodiments, reference Figure 3 In the present application, a second inner flange 601 is provided on the inner circumferential wall near the bottom of one of the second sealing tubes 600 and on the inner circumferential wall near the top of the other second sealing tube 600. The two second sealing tubes 600 are respectively sleeved on the outer circumferential wall near the top of the second elastic sealing sleeve 302 and the outer circumferential wall near the bottom of the second elastic sealing sleeve 302 through the second inner flange 601 provided thereon; wherein the second inner flange 601 can be integrally formed with the second sealing tube 600.

[0033] The inner top surface and the inner bottom surface of the sealing box 400 are both provided with a second annular groove 402, and the top surfaces of the two second annular grooves 402 are both provided with a second elastic baffle 4021, the top of one second sealing cylinder 600 penetrates the corresponding second elastic baffle 4021 and is slidably disposed in the corresponding second annular groove 402, and the bottom of the other second sealing cylinder 600 penetrates the corresponding second elastic baffle 4021 and is slidably disposed in the corresponding second annular groove 402, and the inner diameter of the second annular groove 402 is greater than the thickness of the second sealing cylinder 600. Among them, the second elastic baffle 4021 can be made of a synthetic rubber material with high elasticity, insulation, air tightness, oil resistance, high temperature or low temperature resistance, etc., so that the second elastic baffle 4021 can be ensured to have good sealing performance and elasticity.

[0034] In the above embodiment, during the radial movement of the pull rod 100, the pull rod 100 applies a radial extrusion force to the second elastic sealing sleeve 302, and the second elastic sealing sleeve 302 will apply a radial extrusion force to the two second sealing cylinders 600 connected to its outer peripheral wall after receiving the radial extrusion force from the pull rod 100, and each second sealing cylinder 600 will apply a radial extrusion force to the second elastic baffle 4021 sealed with it after receiving the radial extrusion force from the second elastic sealing sleeve 302, and since the inner diameter of the second annular groove 402 is greater than the thickness of the second sealing cylinder 600, after the second sealing cylinder 600 is subjected to radial extrusion, the second sealing cylinder 600 and the second elastic baffle 4021 can still be in sealing contact, and the bottom of the second sealing cylinder 600 can move freely in the second annular groove 402, thereby ensuring the sealing between the pull rod 100 and the second elastic sealing sleeve 302 during the radial movement of the pull rod 100.

[0035] In some embodiments, reference Figure 1 and Figure 2, the sealing box 400 in the present application is provided with an annular plate 403 on the peripheral wall near the bottom thereof, and the annular plate 403 is connected to the outer casing of the coal mill 200 through a fastener 900. Among them, the fastener 900 may include a fastening bolt and a nut. Specifically, a threaded through hole corresponding to the fastening bolt is provided on the casing of the coal mill 200, and the screw end of the fastening bolt passes through the threaded through hole and is screwed with a nut, so that the annular plate 403 and the casing of the coal mill 200 are fixed together, which improves the stability of the sealing mechanism 300 during the operation of the pull rod 100, thereby ensuring the sealing performance between the pull rod 100 and the casing of the coal mill 200. In addition, the way in which the annular plate 403 is connected to the outer casing of the coal mill 200 through the fastener 900 facilitates the installation and disassembly of the sealing mechanism 300, making the maintenance and overhaul of the sealing mechanism 300 more convenient.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the 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 cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A coal mill tie rod sealing device, characterized in that: include: A sealing mechanism (300) provided at the connection between the pull rod (100) and the coal mill (200); The sealing mechanism (300) comprises a first elastic sealing sleeve (301) and a second elastic sealing sleeve (302) which are sliding sealing sleeves arranged on the pull rod (100) up and down; a sealing box (400) which is a preset distance away from the pull rod (100) is provided on the pull rod (100) between the lower surface of the first elastic sealing sleeve (301) and the bottom of the second elastic sealing sleeve (302); the outer peripheral wall of the first elastic sealing sleeve (301) is connected to the upper surface of the sealing box (400) through a first sealing tube (500); and the second elastic sealing sleeve (302) is connected to the inner top surface and inner bottom surface of the sealing box (400) respectively through two second sealing tubes (600).

2. The coal mill tie rod sealing device according to claim 1, characterized in that: The first elastic sealing sleeve (301) is in the shape of a truncated cone, and the second elastic sealing sleeve (302) is in the shape of a cylinder.

3. The coal mill tie rod sealing device according to claim 1, characterized in that: The first elastic sealing sleeve (301) and the second elastic sealing sleeve (302) are both made of synthetic rubber.

4. The coal mill tie rod sealing device according to claim 1, characterized in that: A sliding groove (700) is provided on the inner wall of the first elastic sealing sleeve (301) and the second elastic sealing sleeve (302), and a sliding block (800) is provided on the pull rod (100). The sliding block (800) is sealed and slidably connected to the sliding groove (700).

5. The coal mill tie rod sealing device according to claim 1, characterized in that: The first sealing sleeve (500) is provided with a first inner flange (501) on its inner peripheral wall near the top thereof, and the inner peripheral wall sealing sleeve of the first inner flange (501) is provided on the outer peripheral wall of the first elastic sealing sleeve (301); The outer top surface of the sealing box (400) is provided with a first annular groove (401), and the top of the first annular groove (401) is provided with a first elastic baffle (4011). The bottom of the first sealing tube (500) passes through the first elastic baffle (4011) and is slidably arranged in the first annular groove (401), and the inner diameter of the first annular groove (401) is greater than the thickness of the first sealing tube (500).

6. The coal mill tie rod sealing device according to claim 1, characterized in that: A second inner flange (601) is provided on the inner circumferential wall of one of the second sealing cylinders (600) near the bottom thereof and on the inner circumferential wall of the other second sealing cylinder (600) near the top thereof, and the two second sealing cylinders (600) are respectively sleeved on the outer circumferential wall of the second elastic sealing sleeve (302) near the top thereof and the outer circumferential wall of the second elastic sealing sleeve (302) near the bottom thereof through the second inner flange (601) provided thereon; The inner top surface and the inner bottom surface of the sealing box (400) are both provided with a second annular groove (402), and the top surfaces of the two second annular grooves (402) are both provided with a second elastic baffle (4021), wherein the top of one of the second sealing tubes (600) passes through the corresponding second elastic baffle (4021) and is slidably set in the corresponding second annular groove (402), and the bottom of the other second sealing tube (600) passes through the corresponding second elastic baffle (4021) and is slidably set in the corresponding second annular groove (402), and the inner diameter of the second annular groove (402) is greater than the thickness of the second sealing tube (600).

7. The coal mill tie rod sealing device according to any one of claims 1 to 6, characterized in that: An annular plate (403) is provided on the peripheral wall of the sealing box (400) close to the bottom surface thereof, and the annular plate (403) is connected to the outer casing of the coal mill (200) via a fastener (900).

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