Dustproof, heat insulation and cooling protection device for hot rolling furnace door oil cylinder

Abstract

A left side cooling water jacket and a right side cooling water jacket of the device form a circular ring through lug plates and connecting bolts and wrap the outer wall of a furnace door oil cylinder body, and the upper portions and the lower portions of the left side cooling water jacket and the right side cooling water jacket are provided with a water feeding pipe connector and a water discharging pipe connector respectively. A guide wheel is arranged on the outer wall of the right cooling water jacket, a limiting protruding block is arranged on the pipe wall of the water feeding and draining pipe connector, an open guide groove is formed in the middle of the arc-shaped heat insulation plate, the arc-shaped heat insulation plate is attached to the guide wheel on the outer wall of the right cooling water jacket, the guide groove is inserted into the water feeding and draining pipe connector of the right cooling water jacket, and the limiting protruding block abuts against the outer wall of the arc-shaped heat insulation plate. The bottom of the arc-shaped heat insulation plate is arranged at the bottom end of the piston rod through a hoop. The device ensures the uniformity of a cooling temperature field, reduces the flow resistance, improves the cooling efficiency, reduces the damage of high-temperature dust to the oil cylinder, ensures the operation reliability of the oil cylinder of the furnace door, and avoids the potential safety hazard caused by leakage.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical equipment protection, and in particular to a dustproof, heat-insulating and cooling protection device for a hot rolling furnace door oil cylinder. Background Art

[0002] In the metallurgical industry, steel rolling heating furnaces are usually regenerative heating furnaces, which use blast furnace gas or mixed gas from blast furnace coke ovens as fuel. The furnace door cylinder drives the furnace door up and down through chains and gears to achieve billet loading and output.

[0003] Because the furnace door cylinder is in the vicinity of the furnace for a long time and the ambient temperature is high, when the furnace door is opened, the radiation temperature aggravates the temperature rise, causing the furnace door cylinder temperature to rise, aggravating the melting and aging of the cylinder seal. The seal failure causes the cylinder piston rod to carry oil, which promotes the adhesion of high-temperature dust, and aggravates the failure of the piston rod seal during the reciprocating movement of the piston rod. Ultimately, the hydraulic oil in the furnace door cylinder fails due to high temperature, the hydraulic cylinder leaks, and the furnace door is unable to lift; the cylinder leaks out and causes the sprayed hydraulic oil to encounter high temperature and cause fire accidents, which poses serious safety hazards.

[0004] The traditional heat insulation and cooling measures for the furnace door oil cylinder are to set up heat insulation boards outside the oil cylinder, wrap the oil cylinder with asbestos or use auxiliary spray cooling. However, due to the influence of ambient temperature, the temperature of the oil cylinder body is still at a high temperature, especially in summer, when the superposition of high temperature weather and high temperature environment causes frequent oil cylinder leakage accidents. Among them, auxiliary spray cooling has problems such as poor temperature field uniformity, large waste, and difficulty in ensuring structural rigidity. Therefore, it is difficult to meet the use requirements of the furnace door oil cylinder in a high temperature environment with only insulation, and appropriate external cooling and dust protection measures must be adopted. Summary of the invention

[0005] The technical problem to be solved by the present invention is a dustproof, heat-insulating and cooling protection device for the hot rolling furnace door cylinder. The device overcomes the defects of traditional furnace door cylinder protection, can not only ensure the uniformity of the cooling temperature field of the furnace door cylinder, but also reduce flow resistance, improve cooling efficiency, reduce the damage of high-temperature dust to the cylinder, ensure the reliability of the operation of the furnace door cylinder, and eliminate safety hazards caused by leakage.

[0006] In order to solve the above technical problems, the dustproof, heat-insulating and cooling protection device for the hot rolling furnace door oil cylinder of the present invention comprises a left cooling water jacket, a right cooling water jacket, an arc-shaped heat-insulating plate and a high-temperature resistant conical telescopic protection jacket, wherein the left cooling water jacket and the right cooling water jacket form a ring through ear plates and connecting bolts and are wrapped around the outer wall of the furnace door oil cylinder, the upper and lower parts of the left cooling water jacket and the right cooling water jacket are respectively provided with an upper water pipe joint and a lower water pipe joint, the outer wall of the right cooling water jacket is provided with a guide wheel, and the upper water pipe joint and the lower water pipe joint are provided with a limit The arc-shaped heat insulation board is provided with an open guide groove from top to bottom in the center, the arc-shaped heat insulation board is close to the guide wheel on the outer wall of the right cooling water jacket, and the guide groove is inserted into the upper water pipe joint and the lower water pipe joint of the right cooling water jacket, the limiting protrusion is against the outer wall of the arc-shaped heat insulation board, the bottom of the arc-shaped heat insulation board is arranged on the bottom end of the piston rod of the furnace door cylinder through a hoop, the high-temperature resistant conical telescopic protective sleeve is inserted into the piston rod of the furnace door cylinder, and the large round end of the high-temperature resistant conical telescopic protective sleeve is against the cylinder body of the furnace door cylinder, and the small round end is against the hoop.

[0007] Furthermore, the arc-shaped heat insulation board is provided with an upper water pipe and an outlet water pipe on both sides of the guide groove, respectively. The guide groove of the arc-shaped heat insulation board divides the arc-shaped heat insulation board into two water areas and connects them at the bottom. Circulating water enters from the upper water pipe and flows out from the outlet water pipe 52. The upper water pipe joints of the left cooling water jacket and the right cooling water jacket are connected in parallel with the upper water pipe of the arc-shaped heat insulation board to form an upper water main pipe for circulating cooling water. The lower water pipe joints of the left cooling water jacket and the right cooling water jacket are connected in parallel with the lower water pipe of the arc-shaped heat insulation board to form a return water main pipe for circulating cooling water.

[0008] Furthermore, the left cooling water jacket and the right cooling water jacket are sliced ​​cooling water jackets, and the top surfaces and bottom surfaces of adjacent sliced ​​cooling water jackets are respectively provided with mutually nested installation steps and positioning steps, and a positioning pin hole is provided in the center, bolts are screwed in between the installation steps and the positioning steps for fastening, and positioning pins are inserted into the positioning pin holes to position the adjacent sliced ​​cooling water jackets.

[0009] Furthermore, the circulating cooling water supply main pipe is provided with a first stop valve and a temperature control valve in sequence, the output end of the temperature control valve is connected to the supply pipe joints of the left cooling water jacket and the right cooling water jacket and the supply water pipe of the arc-shaped thermal insulation board through a throttle valve respectively, and the circulating cooling water return main pipe is provided with a second stop valve and a temperature sensor in sequence, the temperature sensor monitors the cooling water temperature of the circulating cooling water return main pipe and transmits it to the circulating cooling water controller, and the circulating cooling water controller controls the action of the temperature control valve according to the temperature setting value to ensure that the cooling water temperature in the left cooling water jacket, the right cooling water jacket and the arc-shaped thermal insulation board is within a specified range.

[0010] Furthermore, water blocking plates are cross-arranged at intervals from top to bottom in the left cooling water jacket and the right cooling water jacket. Since the dustproof, heat-insulating and cooling protection device for the hot-rolling furnace door oil cylinder of the present invention adopts the above-mentioned technical scheme, that is, the left cooling water jacket and the right cooling water jacket of the device form a ring through ear plates and connecting bolts and are wrapped around the outer wall of the furnace door oil cylinder, the upper and lower parts of the left cooling water jacket and the right cooling water jacket are respectively provided with an upper water pipe joint and a lower water pipe joint, the outer wall of the right cooling water jacket is provided with a guide wheel, and the pipe walls of the upper water pipe joint and the lower water pipe joint are provided with limiting protrusions, the arc-shaped heat insulation board is centrally provided with an open guide groove from top to bottom, the arc-shaped heat insulation board is close to the guide wheel on the outer wall of the right cooling water jacket, and the guide groove is inserted into the upper water pipe joint and the lower water pipe joint of the right cooling water jacket, the limiting protrusion abuts against the outer wall of the arc-shaped heat insulation board, the bottom of the arc-shaped heat insulation board is arranged on the bottom end of the furnace door oil cylinder piston rod through a hoop, the high-temperature resistant conical telescopic protective sleeve is sleeved into the furnace door oil cylinder piston rod, and the large round end of the high-temperature resistant conical telescopic protective sleeve abuts against the furnace door oil cylinder body, and the small round end abuts against the hoop. This device overcomes the defects of traditional furnace door cylinder protection, and can not only ensure the uniformity of the cooling temperature field of the furnace door cylinder, but also reduce flow resistance, improve cooling efficiency, reduce the damage of high-temperature dust to the cylinder, ensure the reliability of furnace door cylinder operation, and eliminate safety hazards caused by leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a schematic diagram of the dustproof, heat-insulating and cooling protection device for the oil cylinder of a hot rolling furnace door of the present invention; Figure 2 is a top view of the protection device; Figure 3 This is a schematic diagram of the state of the protection device when the piston rod of the furnace door cylinder is extended; Figure 4 This is a schematic diagram of the arc-shaped heat insulation board in the protection device; Figure 5 This is a schematic diagram of the connection between the arc-shaped heat insulation board and the piston rod of the furnace door cylinder in this protection device; Figure 6 This is a schematic diagram of the assembly of the sliced ​​cooling water jacket in the protection device; Figure 7 for Figure 4 A top view of Figure 8 This is a schematic diagram of the circulating cooling water connection in this protection device. DETAILED DESCRIPTION

[0012] Implementation example Figures 1 to 5As shown, the dustproof, heat-insulating and cooling protection device for the hot rolling furnace door cylinder of the present invention comprises a left cooling water jacket 1, a right cooling water jacket 2, an arc-shaped heat-insulating plate 3 and a high-temperature resistant conical telescopic protection jacket 4. The left cooling water jacket 1 and the right cooling water jacket 2 form a ring through an ear plate 5 and a connecting bolt 6 and are wrapped around the outer wall of the furnace door cylinder 7. The upper and lower parts of the left cooling water jacket 1 and the right cooling water jacket 2 are respectively provided with upper water pipe joints 11, 21 and lower water pipe joints 12, 22. The outer wall of the right cooling water jacket 2 is provided with a guide wheel 23, and the pipe walls of the upper water pipe joint 21 and the lower water pipe joint 22 are provided with a limiting protrusion 24. The arc-shaped heat insulation board 3 is centrally provided with an open guide groove 31 from top to bottom, the arc-shaped heat insulation board 3 is abutted against the guide wheel 23 on the outer wall of the right cooling water jacket 2, and the guide groove 31 is inserted into the upper water pipe joint 21 and the lower water pipe joint 22 of the right cooling water jacket 2, the limiting protrusion 24 abuts against the outer wall of the arc-shaped heat insulation board 3, the bottom of the arc-shaped heat insulation board 3 is arranged on the bottom end of the furnace door cylinder piston rod 71 through a hoop 32, the high-temperature resistant conical telescopic protective cover 4 is inserted into the furnace door cylinder piston rod 71, and the large round end of the high-temperature resistant conical telescopic protective cover 4 abuts against the cylinder body of the furnace door cylinder 7, and the small round end abuts against the hoop 32.

[0013] Preferably, the arc-shaped heat insulation board 3 is provided with an upper water pipe 33 and an outlet water pipe 34 on both sides of the guide groove 31, respectively. The guide groove 31 of the arc-shaped heat insulation board 3 divides the arc-shaped heat insulation board 3 into two water areas and connects them at the bottom. The circulating water enters from the upper water pipe 33 and exits from the outlet water pipe 34. The upper water pipe joints 11 and 21 of the left cooling water jacket 1 and the right cooling water jacket 2 are connected in parallel with the upper water pipe 33 of the arc-shaped heat insulation board 3 to form a circulating cooling water upper water main pipe, and the lower water pipe joints 12 and 22 of the left cooling water jacket 1 and the right cooling water jacket 2 are connected in parallel with the lower water pipe 34 of the arc-shaped heat insulation board 3 to form a circulating cooling water return water main pipe.

[0014] Preferably, Figure 6 and Figure 7 As shown, the left cooling water jacket 1 and the right cooling water jacket 2 are sliced ​​cooling water jackets, and the top and bottom surfaces of adjacent sliced ​​cooling water jackets are respectively provided with mutually nested installation steps 13 and positioning steps 14, and a positioning pin hole 15 is provided in the center. Bolts 16 are screwed in between the installation steps 13 and the positioning steps 14 to tighten them, and positioning pins 17 are inserted into the positioning pin holes 15 to position the adjacent sliced ​​cooling water jackets.

[0015] During on-site installation, the sliced ​​cooling water jacket is first assembled and tightly fitted to the cylinder body of the furnace door cylinder, and finally connected into a complete multi-layer and multi-piece cooling water jacket. According to the needs of the water temperature cooling effect, the circulating water flow channel and flow direction are designed. The adjacent sliced ​​cooling water jackets use horizontal water pipes to connect the upper and lower water pipe joints on both sides, and the layers are connected with vertical water pipes, and finally a complete circulating water system is formed, which can pass through each area to maximize the heat exchange effect.

[0016] Preferably, Figure 8 As shown, the circulating cooling water supply main pipe 8 is provided with a first stop valve 81 and a temperature control valve 82 in sequence, and the output end of the temperature control valve 82 is connected to the supply pipe joints 11 and 21 of the left cooling water jacket 1 and the right cooling water jacket 2 and the supply water pipe 33 of the arc-shaped heat insulation board 3 through a throttle valve 83, respectively. The circulating cooling water return main pipe 9 is provided with a second stop valve 91 and a temperature sensor 92 in sequence. The temperature sensor 92 monitors the cooling water temperature of the circulating cooling water return main pipe 9 and transmits it to the circulating cooling water controller 93. The circulating cooling water controller 93 controls the action of the temperature control valve 82 according to the temperature setting value to ensure that the cooling water temperature in the left cooling water jacket 1, the right cooling water jacket 2 and the arc-shaped heat insulation board 3 is within the specified range.

[0017] Preferably, as shown in the figure, cross-arranged water blocking plates 10, 20 are arranged from top to bottom in the left cooling water jacket 1 and the right cooling water jacket 2. The water blocking plates slow down the flow of cooling water in the left cooling water jacket and the right cooling water jacket to improve the heat exchange efficiency.

[0018] In this device, the left cooling water jacket and the right cooling water jacket are attached to the surface of the cylinder body, and the circulating water is used to flow in a gradient and staggered manner in the cooling jacket. The cooling jacket and the cylinder body are attached to achieve heat exchange. According to the size of the cylinder body diameter, a segmented cooling water jacket with 2, 4 or more pieces can be appropriately used to achieve standardization and replaceability of spare parts, thereby reducing costs. At the same time, the cooling water circulation system of each cooling water jacket can be combined in series or in parallel according to the temperature of the cylinder, thereby achieving economic, high-efficiency, energy-saving and environmentally friendly effects.

[0019] The installation position of the arc-shaped heat insulation board faces the furnace, shielding the radiant heat of the furnace door and providing certain protection for the oil cylinder and cooling jacket. There is an annular water return groove inside, which is connected to the stepped water channel. The arc-shaped heat insulation board is slotted in the middle, and the cooling water enters from one side and exits from the other side, which can prevent the arc-shaped heat insulation board from being deformed by high temperature and also avoid interference with the cooling jacket.

[0020] The up and down movement of the arc-shaped heat insulation board is limited in the circumferential direction by the upper and lower water pipe joints of the right cooling water jacket, and in the vertical direction by the limit protrusions installed on the upper and lower water pipe joints, and is guided and positioned by the guide wheel installed on the right cooling water jacket to prevent the arc-shaped heat insulation board from tilting.

[0021] When the cylinder piston rod is extended, the piston rod is inside the high temperature resistant conical telescopic protective sleeve, which plays a role in dust prevention. After the heat exchange is completed, the cooling water in the left cooling water jacket, the right cooling water jacket and the arc-shaped insulation board in this device flows back to the total circulating water storage system through the circulating cooling water return main pipe, and can be recycled again after being cooled in the cooling water tower.

[0022] The device adopts three mutually intertwined supporting measures of isolating heat source, sealing and dustproofing, and water jacket cooling. A variety of series, parallel, and mixed water channels can be used. The circulating water flows through every corner of the water channel to ensure that the heat exchange surface is evenly distributed. For oil cylinders of different diameters, two-piece cooling jacket clamping or multi-piece and multi-layer cooling jacket assembly arrangements are provided, so that the inner surface of the cooling water jacket fits more closely to the outer surface of the oil cylinder, thereby improving the heat exchange efficiency. The multi-piece and multi-layer assembled sheet cooling water jacket can be universalized as the minimum unit of the combination, thereby having a wider range of applicability and a simpler structure for manufacturability.

[0023] In view of the problem that traditional insulation baffles are easy to deform, the internal cooling water circuit of the assembled arc-shaped insulation board prevents the insulation board from being deformed by high temperature. Under the freedom restriction of pipe joints and limit bumps, the sliding resistance is reduced by guiding with guide wheels, which ensures reliable operation and long service life.

[0024] For the open cooling water cooling mode, this assembly provides automatic adjustment of the temperature control valve opening and closing according to the temperature, and the return pipe is connected to the circulating water system to achieve energy saving and environmental protection effects.

Claims

1. A dustproof, heat-insulating and cooling protection device for the oil cylinder of a hot rolling furnace door. Features: It includes a left cooling water jacket, a right cooling water jacket, an arc-shaped heat insulation board and a high-temperature resistant conical telescopic protective jacket. The left cooling water jacket and the right cooling water jacket form a ring through ear plates and connecting bolts and are wrapped around the outer wall of the furnace door oil cylinder. The upper and lower parts of the left cooling water jacket and the right cooling water jacket are respectively provided with an upper water pipe joint and a lower water pipe joint. The outer wall of the right cooling water jacket is provided with a guide wheel, and the upper water pipe joint and the lower water pipe joint are provided with a limiting protrusion on the pipe wall. The arc-shaped heat insulation board is centrally arranged from top to bottom. There is an open guide groove, the arc-shaped heat insulation board is against the guide wheel on the outer wall of the right cooling water jacket, and the guide groove is inserted into the upper water pipe joint and the lower water pipe joint of the right cooling water jacket, the limiting protrusion is against the outer wall of the arc-shaped heat insulation board, the bottom of the arc-shaped heat insulation board is arranged on the bottom end of the piston rod of the furnace door cylinder through a clamp, the high-temperature resistant conical telescopic protective sleeve is inserted into the piston rod of the furnace door cylinder, and the large round end of the high-temperature resistant conical telescopic protective sleeve is against the cylinder body of the furnace door cylinder, and the small round end is against the clamp.

2. The dustproof, heat-insulating and cooling protection device for the hot rolling furnace door oil cylinder according to claim 1, Features: The arc-shaped heat insulation board is provided with an upper water pipe and an outlet water pipe on both sides of the guide groove respectively. The guide groove of the arc-shaped heat insulation board divides the arc-shaped heat insulation board into two water areas and connects them at the bottom. Circulating water enters from the upper water pipe and flows out from the outlet water pipe 52. The upper water pipe joints of the left cooling water jacket and the right cooling water jacket are connected in parallel with the upper water pipe of the arc-shaped heat insulation board to form an upper water main pipe for circulating cooling water. The lower water pipe joints of the left cooling water jacket and the right cooling water jacket are connected in parallel with the lower water pipe of the arc-shaped heat insulation board to form a return water main pipe for circulating cooling water.

3. The dustproof, heat-insulating and cooling protection device for the hot rolling furnace door oil cylinder according to claim 1 or 2, Features: The left cooling water jacket and the right cooling water jacket are sliced ​​cooling water jackets, and the top surfaces and bottom surfaces of adjacent sliced ​​cooling water jackets are respectively provided with mutually nested installation steps and positioning steps, and a positioning pin hole is provided in the center. Bolts are screwed in between the installation steps and the positioning steps for fastening, and positioning pins are inserted into the positioning pin holes to position the adjacent sliced ​​cooling water jackets.

4. The dustproof, heat-insulating and cooling protection device for the hot rolling furnace door oil cylinder according to claim 2, Features: The circulating cooling water supply main pipe is provided with a first stop valve and a temperature control valve in sequence, and the output end of the temperature control valve is connected to the supply pipe joints of the left cooling water jacket and the right cooling water jacket and the supply water pipe of the arc-shaped thermal insulation board through a throttle valve respectively. The circulating cooling water return main pipe is provided with a second stop valve and a temperature sensor in sequence. The temperature sensor monitors the cooling water temperature of the circulating cooling water return main pipe and transmits it to the circulating cooling water controller. The circulating cooling water controller controls the action of the temperature control valve according to the temperature setting value to ensure that the cooling water temperature in the left cooling water jacket, the right cooling water jacket and the arc-shaped thermal insulation board is within a specified range.

5. The dustproof, heat-insulating and cooling protection device for the hot rolling furnace door oil cylinder according to claim 2, Features: Water blocking plates are cross-arranged from top to bottom at intervals in the left cooling water jacket and the right cooling water jacket.

Images