CN108504810A - A kind of hydraulic spray gun plugging amount hydraulic control circuit - Google Patents

Abstract

The invention relates to a hydraulic control circuit and measurement method for the amount of mud beating by a hydraulic cannon, which includes a two-way hydraulic control unit, a hydraulic cannon, a mud beating cylinder, a gear flow meter, an encoder and a processing unit, wherein the mud beating piston of the hydraulic cannon is connected to the mud beating cylinder. The piston rod of the oil cylinder is rigidly connected, and the gear flowmeter and the two-way hydraulic control unit are connected in series in the rodless chamber oil circuit of the mud blowing cylinder; an encoder is installed on the gear flowmeter, and the encoder sends the collected pulse signal to the processing unit. According to the actual situation of the tap hole, the present invention formulates different sludge removal amounts, realizes quantitative control of the same operation, is not affected by human experience and judgment factors, maintains the stability of the tap hole, and provides a solid guarantee for the stable and high production of the blast furnace, avoiding the The large deviation caused by long-distance observation and human judgment can be remotely monitored through the external interface of the computer to realize automatic control.

Description

A hydraulic control circuit for the amount of mud knocked out by a hydraulic cannon

technical field

The invention relates to the field of blast furnace hydraulic control, in particular to a hydraulic control circuit for monitoring the amount of sludge knocked out by a hydraulic cannon with a flow meter.

Background technique

As we all know, the precise control of blast furnace hydraulic cannon dredging volume has been an important issue that has plagued blast furnace production for many years. The amount of dredged mud directly affects the depth of the tap hole and the stability of the tap hole, which in turn affects the stable and high output of the blast furnace. The name of the original mud-throwing volume device is mud-throwing stroke indication, which is a mechanical transmission pointer type. The displacement generated by the mud-throwing oil cylinder drives the transmission of the steel wire rope. The wire rope passes through the pulley block composed of rope wheels and drives the pointer to rotate. In order to detect the amount of mud. It estimates the amount of mud beating through the displacement of the transmission parts, and the deviation is large, so the depth of the iron hole cannot be accurately controlled.

In addition, due to the inconsistencies in the skills, experience and vision of the operators in front of the furnace, as well as the inconsistency in the mastery of the iron hole situation, each time the mud beating operation is judged based on the operator's personal experience, it is easy to cause too much mud beating or too little mud beating. When the amount of sludge is too large, the depth of the taphole will be too deep, and it will be difficult to open the taphole next time, resulting in serious waste of blasting mud; when the amount of sludge is too small, the depth of the taphole will be shallow, the tapping time will be short, or the molten iron will not be discharged cleanly And other abnormal conditions seriously affect the life of the blast furnace hearth.

In addition, the operation of blocking the iron hole in front of the furnace after tapping is monitored in the hydraulic gun operating room. Through the long-distance observation of the mud-beating stroke indicator installed on the hydraulic gun on site, due to the large smoke and dust around the iron hole, the sight is poor, unclear, and the reading deviation is too large. Large, poor operability, the control of the depth of the tap hole is mainly judged by the experience of the operator.

Moreover, what the mud beating stroke indication detects is only the displacement of the mud beating oil cylinder and the mud beating piston, rather than the actual amount of mud that the hydraulic gun injects into the iron nozzle. In practical applications, problems such as improper operation of hydraulic guns often occur, and the failure rate is high, easy to be damaged, and the maintenance workload is heavy.

Contents of the invention

Aiming at the deficiencies in the prior art of blast furnace hydraulic guns estimating the amount of sludge knocked out by the displacement of the transmission parts, the deviation is large, and the depth of the tap hole cannot be accurately controlled, the problem to be solved by the present invention is to provide a method for monitoring hydraulic gunning with a flow meter. Mud volume hydraulic control circuit and measurement method.

In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:

The present invention relates to a hydraulic control circuit for the amount of mud beating of a hydraulic cannon, comprising a two-way hydraulic control unit, a hydraulic cannon, a mud beating oil cylinder, a gear flow meter, an encoder and a processing unit, wherein the mud beating piston of the hydraulic cannon and the piston rod of the mud beating oil cylinder are Rigid connection, the gear flowmeter and the two-way hydraulic control unit are connected in series in the rodless chamber oil circuit of the mud pumping cylinder; an encoder is installed on the gear flowmeter, and the encoder sends the collected pulse signal to the processing unit.

The two-way hydraulic control unit includes a two-way hydraulic lock, a proportional reversing valve and an electromagnetic reversing valve. The reversing valve is installed in the hydraulic pipelines of the Y chamber and the X chamber of the two hydraulic control check valves.

There are cut-off valves on the oil pipelines on both sides of the gear flowmeter.

The invention also has a digital display connected to the data output of the processing unit.

The invention discloses a method for measuring the hydraulic pressure control circuit of the amount of sludge pumped by a hydraulic cannon, comprising the following steps:

During the process of the hydraulic gun shooting mud to the iron mouth of the blast furnace, the number of revolutions η of the gear flowmeter is recorded through the encoder;

The processing unit receives the 4-20mA analog signal, and calculates the amount Vn of the hydraulic cannon 3 for mud removal according to the following formula:

Among them, D is the diameter of the mud-beating piston of the hydraulic gun, d is the diameter of the rodless chamber piston of the mud-beating oil cylinder, Vc is the gear geometric capacity of the gear flowmeter, and η is the number of revolutions of the gear flowmeter.

The gear geometric capacity Vc of the gear flowmeter is the capacity corresponding to a sine wave pulse signal of the encoder.

The present invention also includes the following steps: according to the actual conditions of the blast furnace taphole, different mud-removing volumes are formulated to realize the quantitative control of the same operation; Dynamic volume monitoring.

The present invention has the following beneficial effects and advantages:

1. The present invention has been successfully applied in the operation of the blast furnace iron hole. It can formulate different mud volumes according to the actual situation of the iron hole, and realize the quantitative control of the same operation. It is not affected by human experience and judgment factors, and the stability of the iron hole is maintained. , to provide a solid guarantee for the stable and high production of the blast furnace, avoiding the large deviation caused by long-distance observation and human judgment, remote monitoring through the external interface of the computer, and realizing automatic control. .

2. The present invention improves the utilization rate of blasting mud, reduces the amount of blasting mud used, and has greater economic benefits. It not only saves the cost of blasting mud, but also reduces the loss of blast furnace slow wind, and can make the cumulative total of hydraulic blasting mud Reset to zero, it can be used for whole-process, real-time and dynamic volume monitoring of the amount of mud pumped by the hydraulic gun, so as to achieve precise control of the mud pumped amount.

3. The present invention avoids the phenomenon that the blast furnace dredging volume is too large and the depth of the taphole is too deep, the taphole is difficult to open next time, and the waste of blasting mud is serious, and it also avoids the phenomenon that the amount of blast furnace mud is too small, the depth of the taphole is shallow, and the tapping Abnormal conditions such as short time or unclean molten iron seriously affect the life of the blast furnace hearth.

Description of drawings

Fig. 1 is the schematic diagram of the hydraulic control circuit for monitoring the amount of mud pumped by a hydraulic cannon with a flowmeter of the present invention;

Fig. 2 is the calculation schematic diagram of the mud volume in the present invention;

Fig. 3 is a functional flowchart of the application of the present invention.

Among them, 1 is the proportional reversing valve, 2 is the two-way hydraulic lock, 3 is the hydraulic gun, 4 is the mud cylinder, 5.1 is the first stop valve, 5.2 is the second stop valve, 6 is the gear flow meter, and 7 is the encoder , 8 is a processing unit, 9 is a digital display, and 10 is an electromagnetic reversing valve.

Detailed ways

The present invention will be further elaborated below in conjunction with the accompanying drawings of the description.

As shown in Figure 1, a hydraulic control circuit for the mud volume of a hydraulic gun includes a two-way hydraulic control unit, a hydraulic gun 3, a mud cylinder 4, a gear flow meter 6, an encoder 7 and a processing unit 8, wherein the hydraulic gun 3 The mud beating piston is rigidly connected with the piston rod of the mud beating cylinder 4, and the gear flowmeter 6 and the two-way hydraulic control unit are connected in series in the rodless chamber oil circuit of the mud beating cylinder 4; the encoder 7 is installed on the gear flowmeter 6, and the encoder 7. Send the collected pulse signal to the processing unit 8.

The two-way hydraulic control unit includes a two-way hydraulic lock 2, a proportional reversing valve 1 and an electromagnetic reversing valve 10, wherein the proportional reversing valve 1 is installed in the A chamber and B chamber hydraulic pressure In the pipeline, the electromagnetic reversing valve 10 is installed in the hydraulic pipelines of the Y cavity and the X cavity of the two hydraulic control check valves; the oil pipelines on both sides of the gear flowmeter 6 are respectively provided with stop valves, namely the first stop valve 5.1 and the first stop valve 5.1. The second shut-off valve 5.2, to prevent oil leakage during maintenance, the first shut-off valve 5.1 and the second shut-off valve 5.2 need to be closed; a digital display 9 is also provided, which is connected to the data output end of the processing unit 8 .

In this embodiment, the processing unit 8 adopts an industrial control computer with a built-in control program. The two-way hydraulic lock 2 adopts SL30PA1-4X/), the proportional reversing valve 1 adopts 4WRZE25W8-325-7X/6EG24N9EK31/F1D3M, and the electromagnetic reversing valve 10 adopts 4WE6J6X/EG24N9K4V).

Working principle and process of the present invention are as shown in Figure 3:

When the electromagnet b of the proportional reversing valve 1 and the electromagnet c of the electromagnetic reversing valve 10 are energized at the same time, the two-way hydraulic lock 2 is opened, and the high-pressure oil from the hydraulic system enters the rodless cylinder 4 through the gear flow meter 6 Cavity; mud pumping cylinder 4 piston rod stretches out, pushes mud pumping piston of hydraulic gun 3 to inject gun mud into blast furnace iron mouth channel; at the same time, encoder 7 records the number of revolutions of gear flow meter 6 and sends it to processing unit 8, The processing unit 8 accumulates according to the set program, filters, converts, and processes the flow of hydraulic oil entering the rodless cavity of the mud pumping cylinder 4 to generate mud pumping volume of the hydraulic cannon 3 , which is displayed by the digital display 9 .

As shown in Fig. 2, the displacement L of the movement of the mud beating oil cylinder 4 is the stroke of the mud beating piston of the hydraulic gun 3.

D is the diameter of the mud-beating piston of the hydraulic gun 3, Vn is the mud-beating amount of the hydraulic gun 3, d is the diameter of the piston of the mud-beating oil cylinder 4 rodless cavity, V _y is the volume of the hydraulic oil entering the mud-beating oil cylinder 4 rodless cavity, Vc is the gear geometric capacity (single-turn displacement) of the gear flowmeter 6, and η is the number of revolutions of the gear flowmeter 6, then:

From formula (1):

V _y =V _c ·η (3)

Therefore, it can be seen from (4) that as long as the number of revolutions η of the gear flowmeter 6 is known, the amount Vn of the hydraulic cannon 3 can be calculated. In the process of hydraulic gun 3 shooting mud to blast furnace iron mouth, encoder 7 records the number of revolutions η of gear flow meter 6 by sine wave pulse signal, and one pulse is equivalent to the flow rate Vc of gear geometric volume, and converts it into 4- The 20mA analog signal is sent to the processing unit 8, and the processing unit 8 receives the 4-20mA analog signal, and calculates the amount Vn of the hydraulic cannon 3 to knock mud according to the set program, and displays it through the digital display 9.

When in use, the data on the digital display instrument 9 must be cleared before the start of each blocking iron hole. Zero clearing method: press the reset button on the console template, and when the button pops up automatically, the reset and zero clearing is completed. When blocking the iron hole, operate the hydraulic gun 3 in the operating room to turn the handle of the command controller to perform the operation of blocking the iron hole. At the moment when the hydraulic gun 3 blocks the iron hole, operate the handle of the hydraulic gun 3 to hit the mud command controller to start The taphole shoots mud, and the digital display 9 starts to dynamically display the amount of mud (liter), and when the amount of mud hits reaches the required value for the depth of the taphole, the mud-throwing command controller handle resets, and the operation is completed.

The present invention can formulate different desilting volumes according to the actual conditions of the blast furnace taphole, realize quantitative control of the same operation; reset the accumulative sum of the desilting volume of the hydraulic cannon to zero, and can be used for the whole process, time-to-time and dynamic volume monitoring of the desilting volume of the hydraulic cannon, So as to achieve precise control of the amount of sludge; remote monitoring through the external interface of the computer to realize automatic control.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (7)

1. a kind of hydraulic spray gun plugging amount hydraulic control circuit, it is characterised in that：Including bidirectional hydraulic control unit, Hydraulic clay gun, beat The piston rod of mud oil cylinder, gear meter, encoder and processing unit, wherein Hydraulic clay gun beaten mud piston with play mud oil cylinder is rigid Property connection, gear meter and bidirectional hydraulic control unit are connected in series in the rodless cavity oil circuit for playing mud oil cylinder；Gear wheel flow-rate Encoder is installed, encoder send collected pulse signal to processing unit on meter.

2. hydraulic spray gun plugging amount hydraulic control circuit according to claim 1, it is characterised in that：Bidirectional hydraulic control unit Including bidirectional hydraulic lock, proportional reversing valve and solenoid directional control valve, wherein proportional reversing valve is installed on two of bidirectional hydraulic lock In the Y chambers and X chamber fluid pressure lines of hydraulic control one-way valve, solenoid directional control valve is installed on the Y chambers and X chamber hydraulic tubes of two hydraulic control one-way valves Lu Zhong.

3. hydraulic spray gun plugging amount hydraulic control circuit according to claim 1, it is characterised in that：In gear meter both sides Shut-off valve is respectively equipped on oil pipe line.

4. hydraulic spray gun plugging amount hydraulic control circuit according to claim 1, it is characterised in that：Also tool statistics have shown Instrument is connect with the data output end of processing unit.

5. a kind of measurement method of hydraulic spray gun plugging amount hydraulic control circuit, it is characterised in that include the following steps：

During Hydraulic clay gun penetrates stemming to blast furnace taphole, the revolution η of gear meter is recorded by encoder；

Processing unit calculates Hydraulic clay gun 3 according to following formula and beats mud amount Vn：

Wherein, D is the diameter of hydraulic spray gun plugging piston, and d is the diameter for beating mud oil cylinder rodless cavity piston, and Vc is gear meter Gear geometric cpacity, η are the revolution of gear meter.

6. the measurement method of hydraulic spray gun plugging amount hydraulic control circuit according to claim 5, it is characterised in that：Gear stream The gear geometric cpacity Vc of gauge is the corresponding capacity of one sinusoidal wave pulse signal of encoder.

7. the measurement method of hydraulic spray gun plugging amount hydraulic control circuit according to claim 5, it is characterised in that further include Following steps：According to the actual conditions of blast furnace taphole formulate it is different beat mud amount, realize the quantitative control of same operation；Make Hydraulic clay gun Beat mud amount cumulative total reset-to-zero, it is whole for hydraulic spray gun plugging amount, constantly, dynamic volume monitoring.