CN104815744A - Vertical roller mill grinding roller protection sleeve - Google Patents

Abstract

The invention relates to a vertical grinding roller protective cover, which includes a sealing ring sheath and a wheel hub sheath, both of which are of a half-split structure, and the sealing ring sheath and the wheel hub sheath are divided in half The body structure is respectively connected and fixed through the circumferential connecting plate. The hub sheath includes the hub sheath body. The bottom of the hub sheath body is provided with a flange B, which is bolted and installed on the grinding roller hub. There is a radial stepped ash unloading groove, the top of the hub sheath body is provided with an intermediate ring, the seal ring sheath includes the seal ring sheath body, the lower part of the seal ring sheath body is provided with a flange, and the flange is also There is a trumpet-shaped guard plate, and the flange is installed on the intermediate ring through bolts. The advantages are: the present invention can not only effectively protect the surface of the grinding roller from erosion and abrasion in the environment of high-density dust in the mill, but also avoid the reverse erosion and abrasion of the hot air flow with material on both sides of the sealing door and the lower steel plate of the grinding roller in the shell.

Description

Vertical roller mill roller protection sleeve

technical field

The invention belongs to the technical field of vertical roller mills, and in particular relates to a protective cover for vertical roller mills.

Background technique

Vertical mill is an energy-saving grinding equipment widely used in cement, steel, electric power and other industries. The grinding roller is the core component of the grinding mechanism of the vertical roller mill. Through the linkage of the crank arm linkage mechanism of the rocker arm, the tension of the pressurized oil cylinder is converted into the downward pressure of the grinding roller, so that it can grind the material between the grinding roller and the grinding disc. . The material in the mill moves upwards through the air ring at high speed under the drive of the hot air. When the material passes through the grinding roller, it will inevitably cause erosion and abrasion on the surface of the grinding roller. In order to prolong the service life of the grinding roller, the surface of the grinding roller is generally connected by bolts. Protect the grinding roller, and the horn sleeve can be replaced after wear. At the same time, the trumpet sleeve also ensures that the dust concentration at the sealing ring of the grinding roller is much lower than that in the mill, protecting the oil seal of the grinding roller from dust intrusion and causing the oil seal to fail.

At present, the conventional horn sleeve is installed on the grinding roller hub, and 4-8 holes with a diameter of about 100mm are opened on the surface of the horn sleeve to discharge the material entering the horn sleeve through the gap between the horn sleeve and the grinding roller. In production practice, the main problems are: 1. When the grinding roller is running, the material will excessively wear the edge of the hole of the horn sleeve and its radial connecting flange, causing the horn sleeve to be scrapped prematurely, and the dust will invade the oil seal, thus causing the oil seal to fail. , and then abrade the grinding roller bearing; 2. Due to the large taper of the opening of the horn sleeve, the hot air flow carrying the material will be refracted and changed along the surface of the horn sleeve, resulting in erosion and abrasion on both sides of the sealing door of the grinding roller in the centering shell and the lower steel plate. And then cause the vertical mill to leak air.

Therefore, how to protect the surface of the grinding roller from erosion and abrasion in the high-density dust environment in the mill, so as to ensure that the dust cannot invade the oil seal, thereby protecting the normal operation of the grinding roller bearing; and avoiding the air flow caused by the structural problem of the original grinding roller horn sleeve Reverse flushing and abrasion, so as to protect both sides of the middle shell grinding roller seal door and the lower steel plate, ensuring good air tightness of the vertical mill. These technical difficulties have become urgent issues to be solved at present.

Contents of the invention

In order to solve the technical problems in the known technology, the present invention provides a protective cover for vertical roller grinding rollers, which can effectively protect the surface of the grinding rollers from erosion and abrasion in the environment of high-density dust in the mill. It can prevent the hot air flow with material from backwashing and abrading both sides of the grinding roller seal door and the lower steel plate of the shell.

A vertical grinding roller protective cover, including a sealing ring sheath and a wheel hub sheath, characterized in that both the sealing ring sheath and the hub sheath are of a half-split structure, and the two parts of the sealing ring sheath The two half-split structures are connected and fixed through the circumferential connecting plate A, and the two half-split structures of the hub sheath are connected and fixed through the circumferential connecting plate B. The hub sheath includes a hub sheath body, and the hub sheath body The bottom of the flange is provided with a flange B, which is installed on the grinding roller hub through bolt connection, and the side of the flange B away from the sealing ring sheath is also provided with a stepped flange along the radial direction of the flange B. Ash unloading tank, the outlet of the stepped ash unloading tank is smaller than the entrance of the stepped ash unloading tank, the top of the hub sheath body is provided with an intermediate ring, the sealing ring sheath includes a sealing ring sheath body, and the sealing ring The lower part of the sheath body is provided with a flange, and the flange is also provided with a trumpet-shaped guard plate, and the flange is installed on the intermediate ring at the top of the hub sheath through bolt connection.

The present invention can also adopt the following technical solutions:

The preferred technical solution has an additional technical feature: the gap between the sealing ring sheath body and the sealing ring baffle is within 10 mm.

The preferred technical solution has an additional technical feature: the outer side of the second flange is also provided with an annular guard plate, and the annular guard plate is located outside the bolt head of the bolt that installs the wheel hub sheath on the wheel hub.

The advantages and positive effects that the present invention has are:

Since the invention adopts the above-mentioned technical scheme, the sealing ring sheath body on the roller protective cover and the rocker arm sealing ring baffle adopt a small gap to prevent larger particles of dust from entering the inside of the grinding roller protective cover, even if some small particles of dust enter Inside the roller protective cover, the stepped ash discharge groove at the flange B of the hub sheath can also discharge these dust particles, avoiding dust accumulation in the roller protective cover, completely canceling the opening of the original grinding roller horn cover, eliminating the original The grinding roller horn sleeve wears too fast and the material directly invades the grinding roller oil seal from the opening; at the same time, the design of the stepped ash discharge groove prevents the dust-laden airflow in the grinding mill from easily entering the grinding roller protection sleeve. The trumpet-shaped guard plate at the sealing ring sheath of the grinding roller protection sleeve effectively prevents the airflow from reversely scouring and abrading both sides of the grinding roller sealing door and the lower steel plate of the shell. The connecting bolts of the roller protection sleeve are all designed with countersunk head or have protective measures such as protective tubes and guard plates. The patent has a simple structure and a reasonable design, and can effectively prevent accumulation of material in the protective sleeve of the grinding roller. It works normally in the high-density dust environment in the mill, effectively preventing the oil seal from failing, thereby ensuring the service life of the grinding roller bearings, and the easy-to-wear parts are easy to process and can be quickly replaced. At the same time, the ingenious trumpet-shaped guard plate design effectively protects the sealing door of the grinding roller in the middle shell and ensures good airtightness of the vertical mill.

Description of drawings

Fig. 1 is the structural representation that the present invention creates;

Figure 2 is a partially enlarged view of Figure 1;

Fig. 3 is a structural schematic view of the sealing ring sheath;

Fig. 4 is the right view of Fig. 3;

Fig. 5 is a structural schematic view of the hub sheath;

FIG. 6 is a left side view of FIG. 5 .

In the figure: 1. Sealing ring; 2. Sealing ring baffle; 3. Sealing door of grinding roller in middle housing; 4. Sealing ring sheath; 41. Sealing ring sheath body; 42. Flange A; 43. Circumferential direction Connecting plate A; 44, trumpet-shaped guard plate; 5, hub sheath; 51, intermediate ring; 52, hub sheath body; 53, circumferential connecting plate B; 54, flange B; 55, annular guard plate; 6 , Wind ring; 7, Grinding roller hub; 8, Ladder-shaped ash unloading trough.

Detailed ways

In order to further understand the invention content, characteristics and effects of the present invention, the following examples are given hereby, and the details are as follows:

As shown in Figure 1-6.

A vertical roller grinding roller protective cover includes a sealing ring sheath 4 and a wheel hub sheath 5, both of which are of a half-split structure. Wherein, the hub sheath body 52 is rolled by wear-resistant plate, and it is connected with the middle ring 51 on the top, the annular guard plate 55 rolled by wear-resistant plate and the bottom flange B 54 with stepped ash unloading groove 8. It is welded as a whole, and then divided into two half-and-half split structures, and the two half-and-half split structures are connected by two circumferential connecting plates B 53 in pairs to form the hub sheath 5 through countersunk bolts. Among them, the sealing ring sheath body 41 is rolled by wear-resistant plates, and it is welded as a whole with the lower flange 42, the trumpet-shaped guard plate 44 rolled by wear-resistant plates and two circumferential connecting plates 43 , and then divided into two halves, through the countersunk bolts to connect the two halves through two sets of circumferential connecting plates connected to form a sealing ring sheath 4 .

The hub sheath is assembled in the factory and connected with the grinding roller hub 7 through its flange B by bolts. When the sealing ring sheath is turned into the grinding roller on site, the flange and the intermediate ring of the hub sheath are connected together by bolts to realize the connection between the sealing ring sheath and the hub sheath, and make the two The sheath is connected with the grinding roller as a whole.

The seal ring sheath and the rocker arm seal ring baffle keep a small gap of 10mm, which ensures the normal operation of the grinding roller and prevents large particles of dust from entering the inside of the grinding roller protection sleeve, and also protects the rocker arm seal ring and the seal ring The baffle is protected from the erosion and abrasion of high-density dust; the hub sheath and the grinding roller hub are fixedly connected by bolts through the flange B, and there are eight 25mm-wide stepped ash discharge slots in the radial direction of the flange B. It is larger than the gap of dust particles, which is convenient for dust particles to be discharged. The original structure of the opening of the roller horn sleeve is canceled to eliminate the wear point, and the problem of excessive wear of the grinding roller horn sleeve is completely solved. At the same time, the outside of the stepped ash discharge tank The design of the small opening and the large inner opening also effectively prevents the dust-laden airflow in the mill from easily entering the inside of the grinding roller protective cover. There is a trumpet-shaped guard plate on the sealing ring sheath, which effectively prevents the refraction and direction change along the surface of the horn sleeve, causing reverse erosion and abrasion on both sides of the sealing door of the grinding roller of the centering shell and the lower steel plate, and completely solves the problem of the middle shell Air leakage at this point.

Still further preferably, the annular guard plate 55 of the hub sheath is used to protect the bolts connecting the hub sheath and the grinding roller hub; the half connecting bolts of the hub sheath and the sealing ring sheath all use countersunk bolts to protect the bolt heads ; while the trumpet-shaped guard plate is used to protect the connecting bolts of the hub sheath and the sealing ring sheath.

Action principle of the present invention

When the mill is running, the hot air with material blows upward from the air ring 6, and the grinding roller grinds the material on the grinding disc. If the gap between the ring baffles 2 enters the inside of the roller protective sleeve, it will immediately be discharged from the stepped ash discharge groove at the flange B of the hub sheath of the grinding roller protective sleeve and fall back to the grinding area of the grinding disc to continue grinding. Large dust particles will not stay inside the roller protective cover and cause abrasion to the roller oil seal, effectively prolonging the service life of the grinding roller protective cover. At the same time, the design of the step-shaped ash discharge tank can also prevent the dust-laden airflow in the mill from entering the protective cover of the grinding roller directly. The hot air flow with material in the mill will also change direction and blow back along the surface of the hub sheath body 52. At this time, the trumpet-shaped guard plate 44 effectively blocks the air flow from being reflected on both sides of the grinding roller seal door 3 of the centering shell and the lower steel plate. Abrasive to scour.

The beneficial effect of this embodiment is that a small gap is used between the seal ring sheath body and the rocker arm seal ring baffle on the grinding roller protective cover to prevent larger particles of dust from entering the inside of the grinding roller protection cover, even if some small particles of dust enter the grinding roller Inside the roller protective cover, the stepped ash discharge groove at the flange B of the hub sheath can also discharge these dust particles, avoiding dust accumulation in the roller protective cover, completely canceling the opening of the original grinding roller horn cover, eliminating the original grinding The roller horn sleeve wears too fast and the material directly invades the grinding roller oil seal from the opening; at the same time, the design of the stepped ash discharge groove also prevents the dust-laden airflow from easily entering the grinding roller protection sleeve. The trumpet-shaped guard plate at the sealing ring sheath of the grinding roller protection sleeve effectively prevents the airflow from reversely scouring and abrading both sides of the grinding roller sealing door and the lower steel plate of the shell. The connecting bolts of the roller protection sleeve are all designed with countersunk head or have protective measures such as protective tubes and guard plates. The patent has a simple structure and a reasonable design, and can effectively prevent accumulation of material in the protective sleeve of the grinding roller. It works normally in the high-density dust environment in the mill, effectively preventing the oil seal from failing, thereby ensuring the service life of the grinding roller bearings, and the easy-to-wear parts are easy to process and can be quickly replaced. At the same time, the ingenious trumpet-shaped guard plate design effectively protects the sealing door of the grinding roller in the middle shell and ensures good airtightness of the vertical mill.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-mentioned specific embodiments, and the above-mentioned specific embodiments are only illustrative and not restrictive. Those of ordinary skill in the art Under the enlightenment of the present invention, many forms can be made without departing from the purpose of the present invention and the protection scope of the claims, and these all belong to the protection scope of the present invention.

Claims (3)

1. A vertical roller grinding roller protective cover, comprising a sealing ring sheath and a wheel hub sheath, characterized in that: the sealing ring sheath and the wheel hub sheath both have a half-split structure, and the sealing ring sheath The two half-split structures of the hub sheath are connected and fixed through the circumferential connecting plate A, and the two half-split structures of the hub sheath are connected and fixed through the circumferential connecting plate B. The hub sheath includes the hub sheath body, and the hub sheath There is a flange B at the bottom of the sleeve body, and the flange B is installed on the grinding roller hub through bolt connection. The side of the flange B away from the sealing ring sheath is also provided along the radial direction of the flange B. Stepped ash unloading tank, the outlet of the stepped ash unloading tank is smaller than the entrance of the stepped ash unloading tank, the top of the hub sheath body is provided with an intermediate ring, the sealing ring sheath includes the sealing ring sheath body, the The lower part of the seal ring sheath body is provided with a flange, and the flange is also provided with a trumpet-shaped guard plate, and the flange is installed on the middle ring at the top of the hub sheath through bolt connection. 2. The vertical grinding roller protective sleeve according to claim 1, wherein the gap between the sealing ring sheath body and the sealing ring baffle is within 10mm. 3. The protective sleeve for vertical roller grinding roller according to claim 1, characterized in that: the outer side of the flange B is also provided with an annular guard plate, and the annular guard plate is located at the center of the bolt that installs the wheel hub sheath on the wheel hub. outside of the bolt head.