阅读说明：本技术 用于无缝钢管热挤压产线液压系统的氮气补充控制方法 (nitrogen supplement control method for hydraulic system of seamless steel pipe hot extrusion production line ) 是由 徐海林 陆江帆 周强 陈涛 于 2018-05-31 设计创作，主要内容包括：本发明的用于无缝钢管热挤压产线液压系统的氮气补充控制方法,采用局部平衡的方式,泄压与对流同步进行,即阀门前蓄能器内系统压力＝阀门后压力,打开后与大气压力相当,泄压与平衡的目的就是要使得阀门后压力无限接近于阀门前蓄能器内系统压力,本发明先将编号11、12的蓄能器与氮气瓶局部平衡,再将编号11、12的氮气瓶内的高压气体在泄压同时对流进入11号、12号蓄能器,这样系统泄压结束后,编号11、12的蓄能器内的气体压力可达到230kg,与编号1～10的蓄能器内的280kg压差降低到约50kg,反复操作直至阀门前蓄能器内系统压力＝阀门后压力,可轻松打开对流阀,完成整个蓄能器单元的平衡。(The invention relates to a nitrogen supplement control method for a hydraulic system of a seamless steel pipe hot extrusion production line, which adopts a local balance mode to synchronously carry out pressure relief and convection, namely the system pressure in an energy accumulator in front of a valve is equal to the pressure behind the valve, the pressure is equal to the atmospheric pressure after the valve is opened, and the purpose of pressure relief and balance is to lead the pressure behind the valve to be infinitely close to the system pressure in the energy accumulator in front of the valve, the invention firstly locally balances the energy accumulators with numbers 11 and 12 and a nitrogen cylinder, then carries out pressure relief and convection of high-pressure gas in the nitrogen cylinders with numbers 11 and 12 into the energy accumulators with numbers 11 and 12, thus after the system pressure relief is finished, the gas pressure in the energy accumulators with numbers 11 and 12 can reach 230kg, the pressure difference with 280kg in the energy accumulators with numbers 1-10 is reduced to about 50kg, the operation is repeatedly carried out until the system pressure in the energy accumulator in front of the valve is equal to the pressure behind the valve, and, the balancing of the whole accumulator unit is completed.)

1. the nitrogen gas supplement control method for the hydraulic system of the seamless steel pipe hot extrusion production line comprises 12 energy accumulators (1) and 12 external nitrogen charging steel cylinders (2) which are arranged from left to right according to the sequence of numbers 1 to 12, and comprises the following specific steps:

1) Confirming that each external nitrogen-filled steel cylinder (2) is accurately connected with each energy accumulator (1) through a pipeline, and closing the extrusion working mode of each energy accumulator;

2) 4 manual ball valves (2a) arranged on pipelines between the energy accumulators (1) with the numbers of 11 and 12 and the external nitrogen-charging steel cylinders (2) are switched to be in a one-way communication state, and the manual ball valves on the pipelines between the energy accumulators with the other numbers and the external nitrogen-charging steel cylinders are still in a two-way communication state;

3) Opening a manual stop valve (4) on a direct-connection nitrogen pipeline (3) between the energy accumulators (1) with the numbers 11 and 12, and closing the manual stop valve on the direct-connection nitrogen pipeline between the energy accumulators with the numbers 10 and 11 after gas is balanced, namely, separating the energy accumulators with the numbers 1-10 from the pipelines of the energy accumulators with the numbers 11 and 12;

4) closing all hydraulic oil inlet manual valves (5) on a pipeline communicated with the lower parts of the energy accumulators (1) with the numbers of 1-10, and keeping the hydraulic oil inlet manual valves of the energy accumulators with the numbers of 11 and 12 in an open state;

5) entering an operation interface of a hydraulic system control PLC (6) to confirm the system state-to confirm that a pumping mode is in an automatic state, and setting an error reset button to be in a non-alarm state;

6) Clicking a 'nitrogen charging' button on an operation interface of a hydraulic system control PLC (6) to a starting preparation state, and sequentially clicking 'preparation nitrogen charging', 'pressure valve opening' and 'oil valve opening' buttons to finish nitrogen charging preparation work;

7) Clicking a button for starting nitrogen charging, wherein as the hydraulic oil inlet manual valves of the energy accumulators (1) with the numbers of 11 and 12 in the step 4) are in an open state, the hydraulic system control PLC (6) starts the nitrogen charging pump (7) to start nitrogen charging for the energy accumulators with the numbers of 11 and 12, and at the moment, the reading of pressure gauges of the energy accumulators with the numbers of 11 and 12 is monitored until the pressure of the pressure sides of the energy accumulators with the numbers of 11 and 12 is balanced with the pressure of the nitrogen charging side;

8) manually opening a manual stop valve on a direct connection nitrogen pipeline (3) between the energy accumulators with the numbers 10 and 11, and convecting high-pressure nitrogen of the energy accumulators with the numbers 11 and 12 to the energy accumulators with the numbers 1-10 and external nitrogen-charging steel cylinders connected with the energy accumulators by utilizing pressure difference;

9) After the high-pressure nitrogen convection is finished, the manual stop valve on the straight connecting nitrogen pipeline (3) between the energy accumulators with the numbers of 10 and 11 is closed again, the nitrogen charging pump (7) automatically releases the pressure, and the pressure in the energy accumulators with the numbers of 11 and 12 is reduced to be below 5 kg;

10) opening a stop valve (8) arranged on a direct connecting nitrogen pipeline (3) communicated with the right side of the energy accumulator with the number 12, and then opening an external nitrogen bottle (9) communicated with the stop valve to enable the external nitrogen bottle to be communicated with the energy accumulator pipelines with the numbers 11 and 12 through the direct connecting nitrogen pipeline;

11) Repeating the step 6), the step 7) and the step 8) until the 12 energy accumulators (1) reach the required pressure, and finishing the nitrogen supplement process;

12) clicking a 'nitrogen charging stopping' button on an operation interface of a hydraulic system control PLC (6), and stopping and unloading a nitrogen charging pump (7);

13) Sequentially switching and confirming all the manual ball valves (2a) to be in a two-way communication state;

14) and switching the accumulator mode into the extrusion working mode again until the whole nitrogen charging process is finished.

2. The nitrogen gas supplement control method for the hydraulic system of the seamless steel pipe hot extrusion production line according to claim 1, wherein the number of the hydraulic oil inlet manual valves (4) in the step 4) is 12, and 1 pipeline communicated with the lower part of each energy accumulator (1) is arranged.

3. the nitrogen gas supplement control method for the hydraulic system of the seamless steel pipe hot extrusion production line according to claim 1, wherein in the step 11), when the step 6), the step 7) and the step 8) are repeated for the last time, after the step 6) is finished, 4 manual ball valves (2a) on the pipeline between the energy accumulator (1) with the numbers 11 and 12 and the external nitrogen-filled steel cylinder (2) are manually switched to a bidirectional conduction state, and then the operations of the step 7) and the step 8) are executed, so that the gas pressure of the energy accumulator with the numbers 11 and 12 and the external nitrogen-filled steel cylinder connected with the energy accumulator is up to more than 200 bar.

Technical Field

The invention relates to the field of seamless steel pipe production in the ferrous metallurgy industry, in particular to a nitrogen supplement control method for a hydraulic system energy accumulator unit of a seamless steel pipe hot extrusion production line, which is used for performing daily maintenance supplement operation on a nitrogen energy accumulator of a large-scale hydraulic system.

background

at present, as common steel and metallurgical metal products, seamless steel pipes are produced in large quantities by various steel and metallurgical enterprises due to the characteristics of large deformation, easy one-step forming, high production precision, easy tissue continuous production, high yield, suitability for high alloy element processing and the like, and the hot extrusion pipe-making processing mode of the seamless steel pipes also becomes a main mode for producing high-end seamless steel pipes at home and abroad at present.

in a hot extrusion tubing processing method of a seamless steel tube, an extruder is often used, which extrudes a round steel ingot (billet) into the seamless steel tube by a hot extrusion tubing process, wherein the steel ingot material is a prepared and processed stainless steel billet with a diameter of 176 to 416mm, and the diameter of the hot extrusion product ranges from 48 to 325 mm. Can produce hot finished steel pipes and pipe blanks required by high-precision steel pipes through subsequent cold drawing and cold rolling processes.

Disclosure of Invention

In order to solve the problems, the invention provides a nitrogen supplement control method for a hydraulic system of a seamless steel pipe hot extrusion production line, which improves the nitrogen supplement operation mode of the hydraulic system of the seamless steel pipe hot extrusion production line, adopts a local balance mode to replace the mode of firstly carrying out system pressure relief and then carrying out gas balance, the pressure relief and convection are carried out synchronously, and a high-position maintenance platform is moved to a ground platform at a station transfer operation position.

The invention discloses a nitrogen gas supplement control method for a hydraulic system of a seamless steel pipe hot extrusion production line, which comprises the following specific steps:

1. the nitrogen supplementing control method for the hydraulic system of the seamless steel pipe hot extrusion production line comprises 12 energy accumulators and 12 external nitrogen charging steel cylinders which are arranged from left to right according to the sequence of numbers 1 to 12, and comprises the following specific steps:

1) confirming that each external nitrogen-filled steel cylinder is accurately connected with each energy accumulator pipeline, and closing the extrusion working mode of each energy accumulator;

2) 4 manual ball valves arranged on pipelines between the energy accumulators with the numbers of 11 and 12 and the external nitrogen-charging steel cylinder are switched to be in a one-way communication state, and the manual ball valves on the pipelines between the energy accumulators with the other numbers and the external nitrogen-charging steel cylinder are still in a two-way communication state;

3) opening manual stop valves on the direct-connected nitrogen pipelines between the energy accumulators with the numbers 11 and 12, and closing the manual stop valves on the direct-connected nitrogen pipelines between the energy accumulators with the numbers 10 and 11 after the gas is balanced, namely, separating the energy accumulators with the numbers 1-10 from the pipelines of the energy accumulators with the numbers 11 and 12;

4) closing all hydraulic oil inlet manual valves on pipelines communicated with the lower parts of the energy accumulators with the numbers of 1-10, and keeping the hydraulic oil inlet manual valves of the energy accumulators with the numbers of 11 and 12 in an open state;

5) Entering an operation interface of a hydraulic system control PLC to confirm the system state-to confirm that a pumping mode is in an automatic state and a wrong reset button is in a non-alarm state;

6) clicking a 'nitrogen charging' button on an operation interface of a hydraulic system control PLC to a starting preparation state, and sequentially clicking 'preparation nitrogen charging', 'pressure valve opening' and 'oil valve opening' buttons to finish nitrogen charging preparation work;

7) clicking a button for starting nitrogen charging, wherein the hydraulic oil inlet manual valves of the energy accumulators (1) with the numbers of 11 and 12 in the step 4) are in an open state, a hydraulic system controls a PLC (programmable logic controller) to start a nitrogen charging pump to charge the energy accumulators with the numbers of 11 and 12 with nitrogen, and at the moment, the reading of pressure gauges of the energy accumulators with the numbers of 11 and 12 is monitored until the pressure of the pressure sides of the energy accumulators with the numbers of 11 and 12 is balanced with the pressure of the nitrogen charging side;

8) Manually opening a manual stop valve on a direct connection nitrogen pipeline between the energy accumulators with the numbers 10 and 11, and convecting high-pressure nitrogen of the energy accumulators with the numbers 11 and 12 to the energy accumulators with the numbers 1-10 and each external nitrogen-filled steel cylinder connected with the energy accumulators by utilizing pressure difference;

9) after the high-pressure nitrogen convection is finished, the manual stop valve on the direct-connected nitrogen pipeline between the energy accumulators numbered 10 and 11 is closed again, the nitrogen charging pump automatically releases the pressure, and the pressure in the energy accumulators numbered 11 and 12 is reduced to be below 5 kg;

10) Opening a stop valve arranged on a direct connection nitrogen pipeline communicated with the right side of the energy accumulator with the number 12, and then opening an external nitrogen bottle communicated with the stop valve to ensure that the external nitrogen bottle is communicated with the energy accumulator pipelines with the numbers 11 and 12 through the direct connection nitrogen pipeline;

11) repeating the step 6), the step 7) and the step 8) until the 12 energy accumulators reach the required pressure, and finishing the nitrogen supplement process;

12) clicking a 'nitrogen charging stopping' button on an operation interface of a hydraulic system control PLC, and stopping and unloading a nitrogen charging pump;

13) Sequentially switching and confirming all the manual ball valves (2a) to be in a two-way communication state;

14) and switching the accumulator mode into the extrusion working mode again until the whole nitrogen charging process is finished.

the nitrogen supplement control method for the hydraulic system of the seamless steel pipe hot extrusion production line is characterized in that the number of hydraulic oil inlet manual valves in the step 4) is 12, and 1 hydraulic oil inlet manual valve is arranged on a pipeline communicated with the lower portion of each energy accumulator.

the nitrogen gas supplement control method for the seamless steel pipe hot extrusion production line hydraulic system is characterized in that in the step 11), when the step 6), the step 7) and the step 8) are repeated for the last time, after the step 6) is finished, 4 manual ball valves on pipelines between the energy accumulators with the numbers 11 and 12 and an external nitrogen-filled steel cylinder are manually switched to be in a bidirectional conduction state, and then the steps 7) and the step 8) are executed, so that the gas pressures of the energy accumulators with the numbers 11 and 12 and the external nitrogen-filled steel cylinder connected with the energy accumulators reach more than 200 bar.

the invention discloses a nitrogen gas supplement control method for a hydraulic system of a seamless steel pipe hot extrusion production line, which has the design principle that: the invention adopts a local balance mode to replace the mode of firstly relieving pressure of a system and then balancing gas, and the pressure relief and convection are carried out synchronously, namely the pressure of the system in the energy accumulator in front of a valve is equal to the pressure of the system in back of the valve, and the pressure is equal to the atmospheric pressure after the pressure is opened, so that the pressure of the system in back of the valve is infinitely close to the pressure of the system in the energy accumulator in front of the valve, the invention firstly locally balances the energy accumulators with the numbers 11 and 12 and the nitrogen cylinder, then carries out the pressure relief and the convection of the high-pressure gas in the nitrogen cylinders with the numbers 11 and 12 into the energy accumulators with the numbers 11 and 12, thus after the pressure relief of the system is finished, the gas pressure in the energy accumulators with the numbers 11 and 12 can reach 230kg, the pressure difference with 280kg in the energy accumulators with the numbers 1-10 is reduced to about 50kg, the operation is repeated until the pressure of the system in the energy accumulator in front of the valve, the pressure-bearing pressure difference of the high-pressure one-way ball valve is reduced, and the flow of convection is reduced.

the nitrogen supplement control method for the hydraulic system of the seamless steel pipe hot extrusion production line of the invention obtains the following steps

has the advantages that:

1. the invention has reasonable design, smooth working procedure, compact station, safety, reliability, practicability and high efficiency;

2. the invention adopts the mode of replacing system pressure relief and gas balancing by local balance, combines the synchronous operation of pressure relief and convection, reduces the pressure-bearing pressure difference of the high-pressure one-way ball valve, reduces the flow of convection, and reduces the fault and potential safety hazard to equipment and personnel caused by pressure top impact from the source;

3. According to the invention, the operation station is optimized, and the operation position for dangerous operation such as high-pressure gas convection is moved to the ground from the high-position maintenance platform, so that the maintenance operation safety is promoted;

4. The nitrogen supplementing operation is convenient, the operation time is short, the equipment downtime is short, the operation efficiency is improved, the overhaul resource consumption and the equipment downtime disposal time are effectively reduced, and the operation working hour consumption is reduced 2/3;

5. the invention optimizes the operation process flow, does not increase the equipment and facility investment, has low cost and low cost, and is easy to implement on site;

6. the invention has strong universality, and the gas supplementing operation of similar equipment has certain reference and application values.

Drawings

FIG. 1 is a schematic structural diagram of a device part of the nitrogen gas supplement control method for a hydraulic system of a seamless steel pipe hot extrusion production line.

in the figure: 1-an energy accumulator, 2-an external nitrogen charging steel cylinder, 2 a-a manual ball valve, 3-a direct connection nitrogen pipeline, 4-a manual stop valve, 5-a hydraulic oil inlet manual valve, 6-a hydraulic system control PLC, 7-a nitrogen charging pump, 8-a stop valve and 9-an external nitrogen cylinder.

Detailed Description

the nitrogen supplement control method for the hydraulic system of the seamless steel pipe hot extrusion production line according to the present invention is further described with reference to the accompanying drawings and the embodiments.