Blast furnace stokehole buffering rotary oil cylinder structure

Abstract

The utility model discloses a stokehole buffering rotary oil cylinder structure of a blast furnace, relates to the technical field of rotary oil cylinder structures, and solves the problems that in a high-temperature and high-pressure environment, oil cylinder buffering failure and internal leakage are usually caused by long-term operation, a pull rod and a knuckle bearing of a clay gun machine are damaged to different degrees under the action of huge oil pressure due to buffering failure, and the service life of the oil cylinder is prolonged. And the method is not friendly to stokehole operation of a large blast furnace. One end of the cylinder barrel is opened and connected with a piston rod, and the other end is connected with a cylinder tail; the piston rod comprises a piston at the inner end and a buffering device, the buffering device comprises a buffering seat and a buffering copper sleeve, the buffering copper sleeve is arranged outside the buffering seat in a sleeving mode, a buffering groove matched with the buffering copper sleeve is formed in the cylinder tail, an adjustable oil port is formed in the cylinder tail, and the adjustable oil port is connected to the buffering plunger assembly. A piston, a seal, a guide support and a buffer structure of the rotary oil cylinder of the clay gun are optimized, and the effect that the rotary oil cylinder structure is longer in service life and more durable is achieved.

Description

Technical Field

[0001] This utility model relates to the technical field of rotary cylinder structure, and in particular to a blast furnace front buffer rotary cylinder structure. Background Technology

[0002] The blast furnace mud gun is a core piece of equipment for ensuring the safe production of the blast furnace. Its core function is to precisely seal the taphole. After each tapping, the mud gun injects refractory mud into the taphole channel under high pressure to form a reliable sealing layer, preventing the leakage of molten iron and slag at temperatures above 1500°C. Its stable operation is directly related to the continuous operation capability of the blast furnace, avoiding unplanned shutdowns due to sealing failure, and reducing the risk of explosion caused by the overflow of high-temperature molten metal.

[0003] As a component of the mud gun, the rotary hydraulic cylinder, operating in a high-temperature and high-pressure environment for extended periods, also faces various problems, typically manifesting as cylinder buffer failure and internal leakage. Buffer failure, under immense hydraulic pressure, can damage the mud gun's tie rods and joint bearings to varying degrees, which is highly detrimental to operations in front of large blast furnaces. Internal leakage can often prevent the blast furnace from sealing the taphole, leading to reduced or halted blasting and disrupting production. Furthermore, the purchase cost of a single rotary hydraulic cylinder is quite high, often tens of thousands of yuan. Therefore, a reliable rotary hydraulic cylinder is crucial for improving the sealing efficiency and ensuring long-term operation of the mud gun. Utility Model Content

[0004] The purpose of this invention is to provide a blast furnace front buffer rotary cylinder structure, which includes a piston, guide support, and buffer structure for the mud gun rotary cylinder, and optimizes these components to make the rotary cylinder structure more durable and long-lasting.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0006] A blast furnace front buffer rotary cylinder structure includes a cylinder barrel, one end of which is open and connected to a piston rod, and the other end is connected to the cylinder tail. The piston rod includes an inner piston and a buffer device. The buffer device includes a buffer seat and a buffer copper sleeve. The buffer copper sleeve is fitted outside the buffer seat. A buffer groove adapted to the buffer copper sleeve is opened at the cylinder tail, and an adjustable oil port is opened. The adjustable oil port is connected to the buffer plunger assembly.

[0007] Furthermore, the cylinder includes a front cylinder head with an open end, and a pressure cap is connected to the outer end of the front cylinder head.

[0008] Furthermore, the gland and the front cylinder head are provided with several adjusting shims.

[0009] Furthermore, the inner circumference of the front cylinder head is connected to a support and lubrication copper sleeve, which contacts the piston rod.

[0010] Furthermore, the inner circumference of the front cylinder head is connected to a first V-group seal, and the front cylinder head 5 is sealed to the piston rod through the first V-group seal.

[0011] Furthermore, the piston includes a front piston sleeve and a rear piston sleeve, and the front piston sleeve and / or the rear piston sleeve are provided with guide supports.

[0012] Furthermore, a second V-group seal is also fitted over the front piston sleeve and the rear piston sleeve. The ends of the front piston sleeve and the rear piston sleeve extend outward with stepped rings. The two ends of the second V-group seal abut against the corresponding stepped rings and guide supports, respectively.

[0013] Furthermore, the outer side of the guide support is overlaid with an aluminum bronze layer or a tin bronze layer.

[0014] Furthermore, the buffer device also includes a cap, which is located inside the buffer seat and is connected and fixed to the piston rod.

[0015] In summary, this utility model has the following beneficial effects:

[0016] The front piston sleeve, guide support, and rear piston sleeve form a set of pistons, which are then pressed with V-group seals (temperature and pressure resistant fluororubber or silicone rubber). Aluminum bronze or tin bronze is welded to the outside of the guide support, and the hot-fit copper guide strip or 45 steel is no longer used. This can better provide radial support force for the piston, and copper is less likely to wear the inner wall of the cylinder, which facilitates the later offline maintenance.

[0017] The buffer seat, buffer copper sleeve, nut, buffer plunger assembly, and adjustable oil port together form a buffer device. Its function is to slow down the speed of the cylinder during the return stroke, avoiding damage to the spherical bearing or accelerated wear of the support lubrication copper sleeve due to high speed, and preventing cylinder scoring or other effects. Its buffer structure is an adjustable throttle port. Adjusting the buffer plunger assembly can change the cross-sectional area of ​​the oil passage, thereby changing the flow rate and thus the buffering speed. The buffer assembly and the inner wall of the cylinder tail are fitted with a gap. To achieve a better buffering effect, the gap should be as small as possible. The smaller the gap, the more obvious the buffering effect. Through the optimization of the piston, seal, guide support, and buffer structure of the mud gun rotary cylinder, the rotary cylinder is made more durable and easier to maintain on-site. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a blast furnace front buffer rotary oil cylinder according to the present invention.

[0019] Figure 2 This is an internal sectional view of the structure of a blast furnace front buffer rotary oil cylinder according to this utility model;

[0020] Figure 3This is a schematic diagram of the end structure of a blast furnace front buffer rotary oil cylinder structure according to the present invention;

[0021] Figure 4 This is a schematic diagram of the buffer plunger assembly in the blast furnace front buffer rotary cylinder structure of this utility model.

[0022] In the diagram, 1. Piston rod; 101. First V-group seal; 102. Front double seal; 103. Socket head screw; 104. Tail double seal; 105. Spherical plain bearing; 106. Second V-group seal; 107. End fixing screw; 2. Gland; 3. Steel adjusting shim; 4. Support lubrication copper sleeve; 5. Front cylinder head; 6. Cylinder barrel; 7. Front piston sleeve; 8. Guide support; 9. Rear piston sleeve; 10. Buffer seat; 11. Buffer copper sleeve; 12. Connecting cap; 13. Cylinder tail; 14. Buffer plunger assembly. Detailed Implementation

[0023] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. These embodiments do not constitute a limitation on this utility model. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this application.

[0024] A blast furnace front buffer rotary hydraulic cylinder structure, such as Figure 1 and Figure 2 As shown, it includes a cylinder barrel 6 (forged cylinder barrel), one end of which is open and connected to the piston rod 1, and the other end is connected to the cylinder tail 13. The piston rod 1 is made of 45 steel forging or 42CrMo after quenching and tempering. The reason for choosing a forged cylinder barrel 6 is that, unlike welded parts, forgings are more reliable and stable. The inner wall is machined and then polished to ensure installation accuracy.

[0025] like Figure 2 As shown, the cylinder 6 includes a front cylinder head 5 with an open end. The outer circumference of the inner end of the front cylinder head 5 is fixed to the cylinder 6 by welding or screws. The inner ring of the inner end of the front cylinder head 5 is inserted into the cylinder 6, and a sealing groove is opened on the outer circumference of the inner ring of the inner end of the front cylinder head 5. A front double seal 102 is provided in the sealing groove to achieve sealing with the cylinder 6. The front double seal 102 includes an O-ring and an O-ring retainer.

[0026] The outer end of the front cylinder head 5 is connected to the pressure cover 2; the pressure cover 2 and the front cylinder head 5 are provided with several steel adjusting shims 3, and the pressure cover 2 and the front cylinder head 5 are also connected and sealed by internal hexagon screws 103 and dustproof sealing rings (temperature and pressure resistant fluororubber);

[0027] The front cylinder head 5 has an expansion hole at its outer end. The mounting hole contains the first V-group seal 101 (temperature and pressure resistant fluororubber or silicone rubber) at the outer end and the support and lubrication copper sleeve 4 at the inner end. The inner ring of the inner end of the pressure cap 2 is inserted into the front cylinder head 5 and abuts against the outer end of the first V-group seal 101. The front cylinder head 5 contacts the piston rod 1 through the internal support and lubrication copper sleeve 4 and achieves sealing through the first V-group seal 101. The support and lubrication copper sleeve 4 is made of self-lubricating aluminum bronze, which provides support for the piston rod 1 on the one hand and lubrication protection on the other.

[0028] like Figure 2 As shown, a lifting lug is welded to the front end of the piston rod 1, and a spherical bearing 105 is disposed in the lifting lug and the cylinder tail 13 to facilitate connection with external components; the piston rod 1 includes a piston and a buffer device at the inner end.

[0029] The piston includes a front piston sleeve 7 and a rear piston sleeve 9. A guide support 8 is provided on the outer sleeve of the rear piston sleeve 9, and the outer end of the guide support 8 abuts against the end of the front piston sleeve 7. A second V-group seal 106 (temperature and pressure resistant fluororubber or silicone rubber) is also provided on the outer sleeves of the front piston sleeve 7 and the rear piston sleeve 9. A stepped ring extends outward from the outer periphery of the ends of the front piston sleeve 7 and the rear piston sleeve 9. The two ends of the second V-group seal 106 abut against the corresponding stepped ring and the guide support 8. Two sealing grooves are also provided at the tail of the piston rod 1. A tail double seal 104 is provided in the sealing groove. The tail double seal 104 includes an O-ring and an O-ring retainer. The outer periphery of the two tail double seals 104 abuts against the inner periphery of the front piston sleeve 7 and the rear piston sleeve 9, respectively, to achieve sealing.

[0030] like Figure 2 As shown, the buffer device includes a buffer seat 10 and a buffer copper sleeve 11. The buffer copper sleeve 11 is fitted outside the buffer seat 10. The cylinder tail 13 has a buffer groove that matches the buffer copper sleeve 11 and a radial adjustable oil port. The adjustable oil port is connected to the buffer plunger assembly 14.

[0031] In this embodiment, the buffer device further includes a cap 12, which is located inside the buffer seat 10 and fixed to the inner end of the buffer seat 10 by screws. The cap 12 abuts against the inner end of the buffer copper sleeve 11, limiting the displacement of the buffer seat 10 and the buffer copper sleeve 11. The cap 12 is also connected and fixed to the piston rod 1 by end fixing screws 107 (in this embodiment, several axial threaded holes are formed in the cap 12 and the piston rod 1, with half of the threaded holes located in the cap 12 and the other half in the piston rod 1, and then fixed by end fixing screws 107).

[0032] The front piston sleeve 7, guide support 8, and rear piston sleeve 9 form a piston group, and the second V-group seal 106 is pressed on to achieve sealing. The guide support 8 is overlaid with an aluminum bronze layer or tin bronze layer instead of using hot-fitted 45# steel, which can better provide radial support force for the piston. In addition, copper is less likely to wear the inner wall of the cylinder 6, which facilitates the later offline maintenance.

[0033] like Figure 2 and Figure 3 As shown, the buffer seat 10, buffer copper sleeve 11, nut 12, buffer plunger assembly 14, and adjustable oil port together form a buffer assembly. When the oil cylinder returns, it slows down its speed to avoid damage to the spherical bearing 105 or accelerated wear of the support lubrication copper sleeve 4 due to high speed, which may cause damage to the cylinder barrel 6 of the oil cylinder itself.

[0034] like Figure 3 and Figure 4 As shown, the gas in the oil is also discharged through the vent valve in the cylinder tail 13 to prevent oil emulsification. In this embodiment, the vent valve and the buffer plunger assembly 14 are symmetrically distributed on both sides of the vertical axis of symmetry of the piston rod 1 and form a 45-degree angle with the axis of symmetry. The buffer plunger assembly 14 can be a buffer regulating valve, etc. The adjustable oil port serves as an adjustable throttle port and is also connected to the piston chamber in the cylinder 6 through a branch. The buffer plunger assembly 14 can also be replaced with other throttle components.

[0035] The cross-sectional area of ​​the oil passage is changed by adjusting the buffer plunger assembly 14, thereby changing the flow rate and ultimately changing the buffer speed. The buffer device and the inner wall of the cylinder tail 13 are a gap combination. In order to achieve a better buffering effect, the gap should be minimized as much as possible. The smaller the gap, the more obvious the buffering effect. The cylinder tail 13 and the cylinder 6 are connected by screws and other structures and are well sealed.

[0036] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Those skilled in the art can make various modifications or equivalent substitutions to the present utility model within its substance and protection scope, and such modifications or equivalent substitutions should also be considered to fall within the protection scope of the present utility model's technical solution.

Claims

1. A structure for a blast furnace front buffer rotary hydraulic cylinder, characterized in that: It includes a cylinder barrel, one end of which is open and connected to a piston rod, and the other end is connected to the cylinder tail. The piston rod includes an inner piston and a buffer device. The buffer device includes a buffer seat and a buffer copper sleeve. The buffer copper sleeve is fitted outside the buffer seat. A buffer groove adapted to the buffer copper sleeve is opened at the cylinder tail, and an adjustable oil port is opened. The adjustable oil port is connected to the buffer plunger assembly.

2. The structure of a blast furnace front buffer rotary cylinder according to claim 1, characterized in that: The cylinder includes a front cylinder head with an open end, and a pressure cap is connected to the outer end of the front cylinder head.

3. The structure of a blast furnace front buffer rotary cylinder according to claim 2, characterized in that: The gland and the front cylinder head are provided with several adjusting shims.

4. The structure of a blast furnace front buffer rotary cylinder according to claim 2 or 3, characterized in that: The inner circumference of the front cylinder head is connected to a support and lubrication copper sleeve, which contacts the piston rod.

5. A blast furnace front buffer rotary cylinder structure according to claim 2 or 3, characterized in that: The front cylinder head is connected to the first V-group seal on its inner circumference, and the front cylinder head 5 is sealed to the piston rod through the first V-group seal.

6. The structure of a blast furnace front buffer rotary cylinder according to claim 1, characterized in that: The piston includes a front piston sleeve and a rear piston sleeve, and the front piston sleeve and / or the rear piston sleeve are provided with guide supports.

7. The structure of a blast furnace front buffer rotary cylinder according to claim 6, characterized in that: The front piston sleeve and the rear piston sleeve are also fitted with a second V-group seal. The ends of the front piston sleeve and the rear piston sleeve extend outward with stepped rings. The two ends of the second V-group seal abut against the corresponding stepped rings and guide supports, respectively.

8. The structure of a blast furnace front buffer rotary cylinder according to claim 6 or 7, characterized in that: The outer side of the guide support is overlaid with an aluminum bronze layer or a tin bronze layer.

9. The structure of a blast furnace front buffer rotary cylinder according to claim 1, characterized in that: The buffer device also includes a cap, which is located inside the buffer seat and is connected and fixed to the piston rod.

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