Double-seal combination of rotary kiln

Abstract

The invention discloses a double-seal combination of a rotary kiln. The double-seal combination comprises a rotary hub, a reinforcing plate, a packing, a gland, a seal box, an inflation connector, an air bag, a barrel end plate, a connector, a baffle and a barrel. The sealing combination is composed of two parts: 1, flexible sealing is adopted on the outer sides of the two ends of the rotary kiln, that is, a packing and an air bag in a sealing box are fixed by a barrel end plate and a gland, and the packing is pressed on a rotary hub reinforcing plate by pressure generated after gas is introduced into the air bag to expand, which is equivalent to a flexible sealing surrounding on a rotary hub; and 2, the inner side of the rotary kiln cylinder is sealed by gas, that is, gas is introduced into a cavity formed by a cylinder end plate, a baffle and a reinforcing plate through a joint, and one end of the gas blocks materials leaked from the cylinder from the bottom of the baffle and then returns to the cylinder. The innovative and improved sealing scheme effectively solves the problems of'powder leakage 'and environmental pollution of the rotary kiln.

Description

Technical Field

[0001] The invention relates to a seal of a rotary kiln. Background Art

[0002] The rotary kiln used in various industries has a large drum diameter, an operating temperature of ~100℃, and a slight positive pressure between the hub and the drum. This places strict requirements on the sealing between the furnace head, furnace tail and the drum. In reality, the phenomenon of "powder leakage" between the hub and the drum is very serious. Although the sealing scheme has been modified many times, such as introducing gas on both sides of the packing and adopting the method of axially squeezing the packing on the drum, it has been verified that the sealing effect has not been achieved. According to analysis, the rotary kiln hub has a large diameter and large ellipticity, and the roundness required by the design cannot be achieved at all. The packing is only pressed axially, and the radial contact surface with the hub cannot be pressed. Once the packing is worn, a gap will be generated between the hub and the drum, causing "powder leakage". After investigation, a "rotary kiln double seal combination" was developed. Summary of the invention

[0003] The present invention aims to design a rotary kiln double seal combination, and the technical solution adopted by the double seal combination is:

[0004] The first seal uses gas to form an air seal structure, that is, baffles are used to separate the cavity at both ends of the cylinder, and there is a certain gap between the baffle and the reinforced plate on the hub, and a gas seal is formed by injecting gas into the cavity; the second seal uses a combination of an air bag and a flexible packing, that is, ventilation is carried out in the air bag to make it expand and press tightly on the packing, forming extrusion in the axial and radial directions of the packing. Once the packing is worn, the gas in the air bag will be replenished to make the air bag always press the packing against the hub, forming a flexible sealing ring that sticks to the hub and beats with it, thereby preventing "powder leakage" at the head and tail of the rotary kiln.

[0005] A double seal combination for a rotary kiln includes: a rotating hub, a reinforcing plate, a packing, a gland, a sealing box, an inflation joint, an airbag, a cylinder end plate, a joint, a baffle, and a cylinder, characterized in that: the sealing box is fixed on the cylinder end plate and is rigidly connected to the cylinder; the packing is installed on the rotating hub reinforcing plate to form a sealing ring to prevent powder from escaping; an airbag is installed on the outer ring of the packing, and the packing is pressed against the reinforcing plate after inflation; a plurality of transverse grooves are opened on the inner ring of the airbag, and the contact with the packing is closer after contraction; a baffle is added between the cylinder and the cylinder end plate to form an air sealing cavity, and there is a joint on it. Its working mechanism is: 1. Flexible sealing is adopted on the outer side of both ends of the rotary kiln, that is, the packing and the airbag in the sealing box are fixed by the cylinder end plate and the gland, and the pressure generated by the expansion of the gas in the airbag presses the packing against the rotating hub reinforcing plate, which is equivalent to a flexible sealing ring embracing the rotating hub. 2. Gas sealing is adopted inside the rotary kiln cylinder, that is, gas is introduced into the cavity composed of the cylinder end plate, baffle and reinforcement plate through the joint, and one end of the gas blocks the material leaking from the cylinder from the bottom of the baffle and then returns to the cylinder. The innovative and improved sealing scheme effectively solves the problem of "powder leakage" and environmental pollution in the rotary kiln.

[0006] The design points of the present invention are:

[0007] 1. A double seal combination of air seal and air bag plus flexible packing is used between the rotary kiln furnace head and furnace tail cylinder and the rotary hub;

[0008] 2. The first seal is gas seal: baffles are added at both ends of the cylinder to form a space and then the process gas is introduced;

[0009] 3. The second seal is an airbag plus flexible packing: a number of transverse grooves are opened on the inner ring of the airbag to ensure that the airbag can still contract inwards and press the packing after the packing is worn.

[0010] The advantages of the present invention are:

[0011] 1. Gas sealing is to use gas to block the powder overflowing from the cylinder;

[0012] 2. The airbag is combined with flexible packing, so the seal is not affected by packing wear, achieving a good gapless sealing effect;

[0013] 3. Effectively solved the problem of rotary kiln "powder leakage" and environmental pollution;

[0014] 4. The process gas introduced into the cylinder directly enters the cylinder and merges with other process gases before participating in the operation;

[0015] 5. The flexible packing is not affected by the vibration of the rotating hub. After the airbag expands, the packing is always pressed tightly against the rotating drum.

[0016] 6. Extend the maintenance period of rotary kiln and reduce the equipment operation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of a double seal combination of a rotary kiln of the present invention

[0018] Markings in the figure: 1-hub, 2-reinforcement plate, 3-packing, 4-pressure cover, 5-sealing box, 6-inflatable joint,

[0019] 7-airbag, 8-cylinder end plate, 9-joint, 10-baffle, 11-cylinder.

[0020] a-Material inlet, b-Material outlet DETAILED DESCRIPTION

[0021] A rotary kiln double seal assembly comprises: a rotating hub 1, a reinforcing plate 2, a packing 3, a gland 4, a sealing box 5, an inflation joint 6, an air bag 7, a cylinder end plate 8, a joint 9, a baffle 10 and a cylinder 11.

[0022] Specific implementation process:

[0023] 1. Manufacturing: gland 4, sealing box 5, reinforcing plate 2, baffle 10; the sealing box is welded and then drilled;

[0024] 2. Outsourcing or purchase: packing 3, air bag 7, inflation joint 6 and joint 9;

[0025] 3. Assembly welding: The baffle 10 and the cylinder end plate 8 are welded to the cylinder 11 to form a gas seal cavity; the reinforcing plate 2 is welded to the hub 1 to enhance the strength and rigidity of the hub 1 at the gas seal and packing seal;

[0026] 4. Installation:

[0027] a. The sealing box 5 is installed on the cylinder end plate 8, the inflation joint 6 is installed on the airbag 7, and the packing 3 and the airbag 7 are installed in the sealing box 5;

[0028] b. Lead the inflatable connector 6 out from the hole on the sealing box 5, and install the connector 9 on the cylinder 11;

[0029] 5. Connection:

[0030] a. The inflation connector 6 is connected to the connector of the airbag 7 and is connected to the external air source pipeline;

[0031] b. The connector 9 is connected to the cavity formed by the cylinder end plate 8, the baffle 10 and the cylinder 11 and is connected to the external gas source pipeline;

[0032] c. Use gland 4 to compress packing 3 and airbag 7 and then install them on sealing box 5 with bolts;

[0033] 6. After installation, gas is filled into the airbag 7 through the inflation joint 6, and the expanded airbag 7 compresses the packing 3. When the rotary kiln is running, the external gas source is connected through the joint 9.

Claims

1. QS sealed rotary kiln, including: A rotating hub (1), a reinforcing plate (2), a packing (3), a gland (4), a sealing box (5), an inflation joint (6), an airbag (7), a cylinder end plate (8), a joint (9), a baffle (10), and a cylinder (11), characterized in that: the sealing box (5) is fixed on the cylinder end plate (8) and is rigidly connected to the cylinder (11); the packing (3) is installed on the reinforcing plate (2) of the rotating hub (1) to form a sealing ring to prevent powder from escaping; an airbag (7) is installed on the outer ring of the packing (3), and after inflation, the packing (3) is pressed against the reinforcing plate (2); a baffle (10) is added between the cylinder (11) and the cylinder end plate (8) to form an air sealing cavity, on which a joint (9) is provided.

2. The QS sealed rotary kiln according to claim 1, characterized in that: The inner ring of the airbag (7) is provided with a plurality of transverse grooves, so that the airbag (7) contacts the packing (3) more closely after contraction.

Images