A hydraulic control system for a mud gun

Abstract

The utility model relates to a kind of mud gun hydraulic control system, including main pressure oil pipe, main oil return pipe and safety lock module, the safety lock module includes safety control reversing valve and safety control check valve, the safety control check valve is set on main pressure oil pipe, the control oil port of the safety control check valve is connected with the one working oil port of the safety control reversing valve, the pressure port of the safety control reversing valve is connected with main pressure oil pipe, the oil return port of the safety control reversing valve is connected with main oil return pipe.In the utility model, when mud gun does not need to act or mud gun and furnace area overhauls, the main valve core of safety control check valve can be closed by safety control reversing valve, ensure that the pressure oil of main pressure oil pipe cannot enter hydraulic control circuit, mud gun cannot act, from it can ensure safety, improve the operation reliability and safety of mud gun hydraulic control system.

Description

Technical Field

[0001] This utility model belongs to the field of blast furnace ironmaking technology, specifically relating to a mud gun hydraulic control system. Background Technology

[0002] In blast furnace ironmaking, after molten iron is tapped from the blast furnace, a mud gun is used to hold the taphole shut, and then mud is injected to block the taphole for continued smelting. Due to the high temperature and pressure inside the furnace, it is crucial to ensure that the rodless chamber of the mud gun's rotary hydraulic cylinder cannot depressurize after the mud gun holds the taphole. Only then can the pressure inside the furnace be overcome, ensuring that no mud or molten iron spills out during mud injection. Simultaneously, the mud gun must be spun into the taphole quickly enough to minimize the contact time between the nozzle and the molten iron flowing from the taphole, preventing damage to the nozzle. During mud injection, the amount of mud injected must be constantly monitored to ensure it is appropriate, avoiding the danger of insufficient mud leading to molten iron spillage, and avoiding waste due to excessive mud injection, which could cause difficulties in opening the taphole next time. When the mud gun is not in use, or during maintenance of the mud gun and the area in front of the furnace, if pressurized oil from the main pressure oil pipe enters the hydraulic control circuit and causes the mud gun to activate, it can easily create a safety hazard. Current mud gun hydraulic control systems lack measures to control this situation. Utility Model Content

[0003] This utility model relates to a hydraulic control system for mud cannons, which can at least solve some of the defects of the prior art.

[0004] This utility model relates to a hydraulic control system for a mud gun, comprising a main pressure oil pipe, a main return oil pipe, and a hydraulic control circuit. The hydraulic control circuit includes a main control directional valve. The pressure port of the main control directional valve is connected to the main pressure oil pipe via a pressure oil branch pipe, and the return port of the main control directional valve is connected to the main return oil pipe via a return oil branch pipe. The system also includes a safety locking module, which comprises a safety control directional valve and a safety control check valve. The safety control check valve is located on the main pressure oil pipe, and its control port is connected to one of the working ports of the safety control directional valve. The pressure port of the safety control directional valve is connected to the main pressure oil pipe, and the return port of the safety control directional valve is connected to the main return oil pipe.

[0005] As one implementation method, the safety control directional valve is an electromagnetic directional valve.

[0006] As one implementation method, the safety control directional valve is a two-position four-way directional valve.

[0007] As one implementation method, the safety control check valve is a cartridge-type check valve.

[0008] As one implementation method, a high-pressure filter is provided on the main pressure oil pipe.

[0009] As one implementation method, there are two mud gun hydraulic cylinders, namely a rotary hydraulic cylinder and a mud-beating hydraulic cylinder. The hydraulic control circuits are divided into two sets, including a rotary hydraulic circuit connected to the rotary hydraulic cylinder and a mud-beating hydraulic circuit connected to the mud-beating hydraulic cylinder.

[0010] As one implementation method, the main control directional valve on the rotary hydraulic circuit is an electro-hydraulic proportional valve.

[0011] As one embodiment, the sludge-beating hydraulic circuit includes a first sludge-beating hydraulic pipeline connected to the rodless chamber of the sludge-beating hydraulic cylinder and a second sludge-beating hydraulic pipeline connected to the rod chamber of the sludge-beating hydraulic cylinder; the sludge-beating hydraulic circuit is also equipped with a double one-way throttle valve, wherein the first one-way throttle valve group of the double one-way throttle valve is disposed on the first sludge-beating hydraulic pipeline, and the second one-way throttle valve group of the double one-way throttle valve is disposed on the second sludge-beating hydraulic pipeline.

[0012] As one implementation method, the return oil branch pipe is equipped with a one-way valve, the conduction direction of which is from the main control directional valve to the main return oil pipe.

[0013] As one implementation method, a pressure measuring unit is provided on the main pressure oil pipe.

[0014] This utility model has at least the following beneficial effects:

[0015] In this invention, a safety locking module is installed on the main pressure oil pipe. When the mud gun does not need to operate or when the mud gun and furnace front area are under maintenance, the main valve core of the safety control check valve can be closed through the safety control reversing valve, ensuring that the pressure oil in the main pressure oil pipe cannot enter the hydraulic control circuit, and the mud gun cannot operate. This ensures safety and improves the operational reliability and safety of the mud gun hydraulic control system. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the structure of the mud cannon hydraulic control system provided in this embodiment of the utility model;

[0018] Figure 2 A schematic diagram of the structure of the mud cannon rotation hydraulic control system provided in this embodiment of the utility model;

[0019] Figure 3A schematic diagram of the structure of the mud-pumping hydraulic control system provided in this embodiment of the utility model. Detailed Implementation

[0020] The technical solutions in the embodiments of this utility model are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model. Example 1

[0021] like Figure 1 and Figure 2 This utility model provides a mud gun rotary hydraulic control system, including a rotary hydraulic cylinder 100 and a rotary hydraulic circuit.

[0022] The rotary hydraulic circuit includes a rotary control directional valve 105, a first rotary hydraulic line 103 connected to the rodless chamber of the rotary hydraulic cylinder 100, and a second rotary hydraulic line 104 connected to the rod chamber of the rotary hydraulic cylinder 100.

[0023] The pressure port of the rotary control directional valve 105 is connected to a first pressure oil branch pipe (shown in the figure, not labeled) for connection to the main pressure oil pipe 300, and the return oil port of the rotary control directional valve 105 is connected to a first return oil branch pipe (shown in the figure, not labeled) for connection to the main return oil pipe 400; the first rotary hydraulic line 103 and the second rotary hydraulic line 104 are respectively connected to the two working oil ports of the rotary control directional valve 105.

[0024] A shut-off valve (shown in the figure but not labeled) is provided on the first rotary hydraulic line 103, the second rotary hydraulic line 104 and the first pressure oil branch pipe. The shut-off valve includes, but is not limited to, ball valves.

[0025] In one embodiment, such as Figure 2 A first check valve (shown in the diagram but not labeled) is provided on the first return oil branch pipe, including but not limited to a tubular check valve, to prevent hydraulic oil in the main return oil pipe 400 from backflowing into the first return oil branch pipe, which could lead to malfunction or oil leakage.

[0026] In one embodiment, the aforementioned rotary hydraulic circuit is an automatic control circuit, and the aforementioned rotary control directional valve 105 is an electro-hydraulic proportional valve. During a single operation, the opening of the electro-hydraulic proportional valve is adjusted by regulating the instantaneous input signal of the electro-hydraulic proportional valve, thereby regulating the flow of hydraulic oil through the electro-hydraulic proportional valve, which can achieve the effect of real-time adjustment of the mud gun rotation speed. Due to the large weight and inertia of the mud gun, a slower rotation speed when starting the mud gun and returning to the standby position is beneficial to reduce vibration and impact and protect the mud gun. However, when approaching the iron taphole, a faster speed is required to avoid the molten iron burning the nozzle. Therefore, using an electro-hydraulic proportional valve to adjust the mud gun rotation speed in real time can improve the reliability and safety of mud gun operation.

[0027] In one embodiment, such as Figure 2 A sequence valve 106 is provided on the second rotary hydraulic line 104. An overflow bypass is connected between the first rotary hydraulic line 103 and the second rotary hydraulic line 104. A bypass overflow valve 107 and a bypass check valve 108 are provided on the overflow bypass. The sequence valve 106 is located between the overflow bypass and the rotary control directional valve 105. Specifically, the bypass point of the overflow bypass on the first rotary hydraulic line 103 is defined as the first bypass point. The bypass point on line 104 is the second bypass point. On the second rotary hydraulic line 104, the sequence valve 106 is located on the side of the second bypass point near the rotary control directional valve 105. On the overflow bypass, the first bypass point, the bypass check valve 108, the bypass overflow valve 107, and the second bypass point are distributed in sequence. The control oil source pipe of the sequence valve 106 is connected to the first rotary hydraulic line 103. The conduction direction of the bypass check valve 108 is from the second bypass point to the first bypass point.

[0028] Preferably, the sequence valve 106 is a pilot-operated sequence valve, and the bypass relief valve 107 is preferably a pilot-operated relief valve, which allows for more precise control of the rotary hydraulic circuit. The bypass check valve 108 includes, but is not limited to, a plate-type check valve.

[0029] Based on the above design, the hydraulic oil in the rod chamber of the rotary hydraulic cylinder 100 flows through the second rotary hydraulic line 104 to the inlet of the sequence valve 106 and the bypass relief valve 107. The opening pressure of the sequence valve 106 is preferably set to the system pressure, and its control port X is connected to the first rotary hydraulic line 103. However, during the mud gun's advance, the load is small, and the working pressure of the first rotary hydraulic line 103 is lower than the system pressure. Therefore, the sequence valve 106 does not open, and the side check valve of the sequence valve 106 in this direction is closed. The opening pressure of the bypass relief valve 107 is set lower (far lower than the system pressure), and its control port X is connected to the second... On the rotating hydraulic line 104, and at this time the second rotating hydraulic line 104 is connected to the main return oil line 400, the pressure is low. Therefore, when the piston rod of the rotating hydraulic cylinder 100 extends, the oil pressure between the rod chamber of the rotating hydraulic cylinder 100 and the sequence valve 106 rises to the opening pressure of the bypass relief valve 107 (at this time the sequence valve 106 is still closed), the bypass relief valve 107 opens, and the hydraulic oil in the rod chamber is replenished to the first rotating hydraulic line 103 through the bypass relief valve 107 and the bypass check valve 108, which replenishes the oil volume for the mud gun rotation, which is beneficial to meet the maximum speed requirement of the mud gun rotation and improve the response speed of the mud gun rotation.

[0030] When the mud gun is rotated to the working position and the nozzle is pressed against the iron nozzle, the rotation control directional valve 105 returns to the neutral position and the valve core does not move. At this time, the pressure of the first rotation hydraulic line 103 rises to the system pressure. At this time, the sequence valve 106 opens, and the hydraulic oil in the second rotation hydraulic line 104 flows back to the main return oil line 400 through the sequence valve 106. The rod chamber is depressurized. In this way, the pressure in the rodless chamber is used to press against the iron nozzle, without offsetting the oil pressure in the rod chamber. This can ensure sufficient sealing pressure between the mud gun and the iron nozzle when mud gunning, and prevent mud from running out.

[0031] In one embodiment, such as Figure 2 A first hydraulic control check valve 109 is provided on the first rotary hydraulic line 103. The outlet of the first hydraulic control check valve 109 is the channel port near the rodless chamber of the rotary hydraulic cylinder. The control port of the first hydraulic control check valve 109 is connected to the second rotary hydraulic line 104. The first hydraulic control check valve 109 can play the role of maintaining pressure in the rodless chamber. When an overflow bypass is provided, the first bypass point is preferably located between the first hydraulic control check valve 109 and the rotary hydraulic cylinder 100. Specifically, after the mud gun blocks the iron hole, the hydraulic oil in the second rotary hydraulic line 104 flows back to the main return oil line 400 through the sequence valve 106, and the pressure at the control port X of the first hydraulic check valve 109 is low. At this time, the hydraulic check valve is closed. When an overflow bypass is provided, the oil pressure between the rodless chamber of the rotary hydraulic cylinder 100 and the first hydraulic check valve 109 is locked because the bypass check valve 108 is also blocked. The rotary hydraulic cylinder 100 is locked and blocks the iron hole, ensuring the reliability of the mud gun operation.

[0032] When the mud gun moves forward, the rotary control directional valve 105 is activated (for example, in the right valve position). The pressurized oil enters the rodless chamber of the mud gun rotary hydraulic cylinder through the first pressurized oil branch pipe, the rotary control directional valve 105 and the first rotary hydraulic line 103 in sequence, pushing the piston rod to extend and the mud gun moves forward.

[0033] When the mud gun returns, the rotary control directional valve 105 is activated (if the rotary control directional valve 105 is in the right position when the mud gun is moving forward, then it is in the left position when the mud gun returns). The pressurized oil passes sequentially through the first pressurized oil branch pipe, the rotary control directional valve 105, and the side check valve of the sequence valve 106 (oil can flow in this direction), to the inlet of the bypass relief valve 107. Since the control port X of the bypass relief valve 107 is connected to the second rotary hydraulic line 104, and the oil pressure of the second rotary hydraulic line 104 is high at this time, the bypass relief valve 107 is not opened. The pressurized oil enters the rod chamber of the mud gun rotary hydraulic cylinder 100 through the second rotary hydraulic line 104, pushing the piston rod to retract, and the mud gun retracts. At this time, the hydraulic oil in the rodless chamber of the rotary hydraulic cylinder 100 flows through the first rotary hydraulic line 103 to the inlet of the first hydraulic control check valve 109. Since the control port of the first hydraulic control check valve 109 is connected to the second rotary hydraulic line 104, and the oil pressure in the second rotary hydraulic line 104 is high at this time, the first hydraulic control check valve 109 can be opened. At this time, the hydraulic oil in the rodless chamber of the rotary hydraulic cylinder 100 can return to the oil tank through the first hydraulic control check valve 109, the rotary control directional valve 105, and the first return branch pipe.

[0034] In one embodiment, such as Figure 2 The rotary hydraulic circuit further includes a first pressure-holding pipeline (shown in the figure, but not labeled), with a first end of the first pressure-holding pipeline connected to the first pressure oil branch pipe and a second end of the first pressure-holding pipeline connected to the first rotary hydraulic pipeline 103.

[0035] When a first hydraulic control check valve 109 is provided on the first rotary hydraulic line 103, the second end of the first pressure holding line is preferably located between the first hydraulic control check valve 109 and the rotary hydraulic cylinder 100.

[0036] A second hydraulically controlled check valve 110 is provided on the first pressure-holding pipeline, and a pressure-holding control module for controlling the opening and closing of the second hydraulically controlled check valve 110 is configured, wherein, preferably, as shown in the example... Figure 2 The pressure holding control module includes a pressure holding control bypass (shown in the diagram, but not labeled) and a pressure holding directional valve 111. The first end of the pressure holding control bypass is connected to the first pressure oil branch pipe / first pressure holding pipe, and the second end is connected to the pressure port of the pressure holding directional valve 111. The return oil port of the pressure holding directional valve 111 is connected to a first drain branch pipe for connection to the main drain pipe 500. One of the working oil ports of the pressure holding directional valve 111 is connected to the control oil port of the second hydraulic check valve 110.

[0037] When the first end of the pressure holding control bypass is connected to the first pressure holding line, the first end is located between the first end of the first pressure holding line and the second hydraulic control check valve 110.

[0038] When the pressure in the rodless chamber of the rotary hydraulic cylinder 100 drops too quickly, mud may leak, affecting the normal operation of the mud gun, or even causing molten iron to leak out, which could be dangerous. However, by setting up a first pressure-holding pipeline, hydraulic oil can be added to the first rotary hydraulic pipeline 103, thereby improving the pressure stability of the rodless chamber of the rotary hydraulic cylinder 100.

[0039] The pressure-holding directional valve 111 mentioned above is preferably an electromagnetic directional valve, which is convenient for automatic control, including but not limited to a two-position four-way electromagnetic directional valve.

[0040] Among them, such as Figure 2 A first pressure measuring unit 120 is provided on the first rotary hydraulic line 103 for real-time detection of the oil pressure in the first rotary hydraulic line 103. When maintaining pressure in the rodless chamber of the rotary hydraulic cylinder 100, the pressure in the rodless chamber of the rotary hydraulic cylinder 100 can be detected and known through the first pressure measuring unit 120. The mud gun rotary hydraulic control system also includes a central controller, and the aforementioned pressure-holding reversing valve 111 and the first pressure measuring unit 120 are both electrically or communicatively connected to the central controller. The first pressure measuring unit 120 includes, but is not limited to, installing a pressure measuring and venting connector on the first rotary hydraulic line 103, and connecting a pressure gauge to the pressure measuring and venting connector via a pressure measuring hose.

[0041] More preferably, such as Figure 2 A second check valve 112 is also provided on the first pressure-holding pipeline. This second check valve 112 is located between the second hydraulically controlled check valve 110 and the second end of the first pressure-holding pipeline. The conduction direction of the second check valve 112 is the direction from the second hydraulically controlled check valve 110 to the second end of the first pressure-holding pipeline. This second check valve 112 can ensure that the oil in the rodless chamber of the rotary hydraulic cylinder 100 and the first rotary hydraulic pipeline 103 will not flow back to the second hydraulically controlled check valve 110 and cause malfunction.

[0042] The following explanation uses the pressure-holding directional valve 111, which is a two-position four-way solenoid directional valve, as an example to illustrate the operation of the first pressure-holding pipeline.

[0043] When the mud gun hits the iron taphole, if the pressure in the rodless chamber of the rotary hydraulic cylinder 100 drops rapidly, the electromagnet of the two-position four-way solenoid directional valve is energized. The two-position four-way solenoid directional valve is in the left valve position. The pressure oil passes through the first pressure oil branch pipe, the pressure holding control bypass, and the P and B ports of the pressure holding directional valve 111, and acts on the control oil port X of the second hydraulic control check valve 110. At this time, the main valve core of the second hydraulic control check valve 110 opens, and the pressure oil is further replenished to the first rotary hydraulic pipeline 103 through the second hydraulic control check valve 110 to ensure that the pressure in the rodless chamber of the rotary hydraulic cylinder 100 does not drop, so that the mud gun can work normally. If the rodless chamber of the rotary hydraulic cylinder 100 does not require pressure holding, the solenoid of the two-position four-way solenoid directional valve is de-energized, and the two-position four-way solenoid directional valve is in the right valve position. At this time, the control port X of the second hydraulic control check valve 110 is connected to the main drain pipe 500. The second hydraulic control check valve 110 is not opened, and the pressure oil will not be replenished to the first rotary hydraulic pipeline 103.

[0044] In one embodiment, the rotary hydraulic circuit further includes a second pressure-holding line (illustrated but not labeled), one end of which is equipped with an accumulator 113 for storing pressurized oil. The outlet end of the second pressure-holding line is connected to the rodless chamber of the rotary hydraulic cylinder 100. A safety valve 114 is provided on the second pressure-holding line, located between the accumulator 113 and the outlet end of the second pressure-holding line, for controlling the on / off state of the second pressure-holding line. The safety valve 114 may include, but is not limited to, a ball valve.

[0045] Furthermore, such as Figure 2 A bypass is connected to the second pressure-holding pipeline, and an unloading ball valve 115 is installed on this bypass. This bypass can be connected to the main return oil pipeline 400. Furthermore, an overflow branch can be connected to the second pressure-holding pipeline. This overflow branch can also be connected to the aforementioned bypass, with its two ends located on either side of the unloading ball valve 115. A branch overflow valve 116 is installed on the overflow branch. When the accumulator 113 needs to be unloaded for maintenance or when the pressure inside the accumulator 113 exceeds the safety pressure set by the branch overflow valve 116, the pressurized oil inside the accumulator 113 can be discharged to the main return oil pipeline 400. The aforementioned safety valve 114, unloading ball valve 115, and branch overflow valve 116 can be combined into a safety valve group 114.

[0046] The aforementioned second pressure-holding line can be connected in parallel to the first rotary hydraulic line 103; in another embodiment, such as Figure 2 When both a first pressure-holding line and a second pressure-holding line are provided, the second pressure-holding line can also be connected in parallel to the first pressure-holding line. When oil enters the first rotary hydraulic line 103 / first pressure-holding line, the aforementioned safety valve 114 is opened, and pressurized oil can also be replenished into the accumulator 113.

[0047] Preferably, taking the second pressure-holding pipeline as an example, it is connected to the first pressure-holding pipeline in a bypass manner. Figure 2 A third check valve 117 is also provided on the first pressure holding pipeline. The conduction direction of the third check valve 117 is from the first end of the first pressure holding pipeline to the second hydraulic check valve 110. This ensures that the pressure oil stored in the accumulator 113 is only used for pressure holding and will not flow back into the main pressure oil pipe 300 due to low pressure. This ensures that the accumulator 113 always stores a sufficient amount of pressure oil for pressure holding.

[0048] The pressurized oil stored in the accumulator 113 can replenish the rodless chamber of the rotary hydraulic cylinder 100. This ensures that even if the pump station stops supplying pressurized oil due to a power outage, the pressurized oil stored in the accumulator 113 can maintain the pressure in the rodless chamber of the rotary hydraulic cylinder, guaranteeing safe and reliable mud gun operation. Furthermore, since the mud gun needs to be held against the taphole for 15-30 minutes after mud is poured until the mud hardens, the accumulator 113 allows the hydraulic pump to be stopped, relying solely on the pressurized oil stored in the accumulator 113 to maintain pressure, thus saving energy.

[0049] like Figure 2 A second pressure measuring unit (shown in the figure but not labeled) can be installed on the second rotary hydraulic line 104. The structure of the second pressure measuring unit can refer to the structure of the first pressure measuring unit 120, and will not be described in detail here.

[0050] The rotary hydraulic circuit provided in this embodiment can be an automatic control circuit. As mentioned above, the rotary control directional valve 105 can be an electro-hydraulic proportional valve, and the pressure-holding directional valve 111 can be a solenoid directional valve. The rotary hydraulic circuit provided in this embodiment can also be a manual control circuit, in which case both the rotary control directional valve 105 and the pressure-holding directional valve 111 are manual directional valves.

[0051] like Figure 1 and Figure 2 A manually controlled rotary hydraulic circuit is provided. Since the manual directional valve does not have the function of real-time flow adjustment, a one-way return oil throttle valve 118 and a one-way inlet oil throttle valve 119 are provided on its first rotary hydraulic line 103. The speed of mud gun retraction and mud gun forward can be adjusted respectively. The one-way return oil throttle valve 118 is located on the side of the one-way inlet oil throttle valve 119 away from the rotary hydraulic cylinder 100.

[0052] In this design, because the standby position is at a relatively low elevation during the mud gun's rotation trajectory, a return oil throttle valve is used to regulate the speed to prevent the mud gun from stalling due to its own weight during retraction. When the mud gun retracts, the hydraulic oil in the rodless chamber of the rotating hydraulic cylinder 100 returns to the oil tank via the left bypass check valve of the one-way inlet throttle valve 119 and the throttle valve core of the one-way return oil throttle valve 118. The flow rate is regulated by the throttle valve core of the one-way return oil throttle valve 118, thereby regulating the retraction speed of the mud gun and establishing back pressure to overcome the influence of the mud gun's own weight, preventing stalling and excessive vibration. When the mud cannon advances, it often moves at high speed, resulting in a large flow rate and high pressure of hydraulic oil in the first rotating hydraulic line 103. To avoid unnecessary energy consumption and heat generation caused by high back pressure, an inlet throttling speed regulation method is adopted. Specifically, when the mud cannon advances, the pressurized oil enters the rodless chamber of the rotating hydraulic cylinder 100 through the left bypass check valve of the one-way return throttling valve 118 and the throttling valve core of the one-way inlet throttling valve 119. The flow rate is adjusted by the throttling valve core of the one-way inlet throttling valve 119, thereby regulating the speed of the mud cannon's advance. Based on the above operation, the inlet and return throttling speed regulation methods are selected according to the different working conditions of the mud cannon's advance and retreat, which is more conducive to the operation of the mud cannon and improves the stability and reliability of the mud cannon's operation.

[0053] like Figure 1 and Figure 2 In one embodiment, the mud gun rotation hydraulic control system includes an automatic control rotation hydraulic circuit 101 and a manual control rotation hydraulic circuit 102, which are connected in parallel and connected to the rotation hydraulic cylinder 100. The automatic control rotation hydraulic circuit 101 and the manual control rotation hydraulic circuit 102 can serve as backups for each other, thereby improving the reliability and safety of the mud gun rotation operation. Example 2

[0054] like Figure 1 and Figure 3 This utility model provides a mud-pumping hydraulic control system, including a mud-pumping hydraulic cylinder 200 and a mud-pumping hydraulic circuit.

[0055] The sludge-beating hydraulic circuit includes a sludge-beating control directional valve 203, a first sludge-beating hydraulic line 208 connected to the rodless chamber of the sludge-beating hydraulic cylinder 200, and a second sludge-beating hydraulic line 209 connected to the rod chamber of the sludge-beating hydraulic cylinder 200.

[0056] The pressure port of the mud-dredging control directional valve 203 is connected to a second pressure oil branch pipe (shown in the figure, not labeled) for connection to the main pressure oil pipe 300, and the return oil port of the mud-dredging control directional valve 203 is connected to a second return oil branch pipe (shown in the figure, not labeled) for connection to the main return oil pipe 400; the first mud-dredging hydraulic line 208 and the second mud-dredging hydraulic line 209 are respectively connected to the two working oil ports of the mud-dredging control directional valve 203;

[0057] A shut-off valve (shown in the diagram but not labeled) is provided on the first sludge hydraulic pipeline 208, the second sludge hydraulic pipeline 209, and the second pressure oil branch pipe. The shut-off valve includes, but is not limited to, ball valves.

[0058] In one embodiment, such as Figure 3 A fourth check valve (shown in the diagram but not labeled) is provided on the second return oil branch pipe. This includes, but is not limited to, a tubular check valve, which can prevent hydraulic oil in the main return oil pipe 400 from flowing back into the second return oil branch pipe, thus preventing malfunctions or oil leakage.

[0059] The sludge-driving hydraulic circuit provided in this embodiment can be an automatic control circuit, and the sludge-driving control directional valve 203 can be an electro-hydraulic directional valve; the sludge-driving hydraulic circuit provided in this embodiment can also be a manual control circuit, and the sludge-driving control directional valve 203 can be a manual directional valve.

[0060] In one embodiment, such as Figure 3 The aforementioned sludge-driving hydraulic circuit is equipped with dual one-way throttle valves 204. The first one-way throttle valve group of the dual one-way throttle valves 204 is installed on the first sludge-driving hydraulic line 208, and the second one-way throttle valve group of the dual one-way throttle valves 204 is installed on the second sludge-driving hydraulic line 209. Based on this design, the sludge-driving speed and retraction speed of the sludge-driving hydraulic cylinder 200 can be reliably adjusted, improving the working reliability of the sludge-driving hydraulic cylinder 200; the use of dual one-way throttle valves 204 has the advantage of high control precision.

[0061] In another embodiment, the above-mentioned mud-beating control directional valve 203 can be designed as an electro-hydraulic proportional valve, which can also achieve the purpose of adjusting the mud-beating speed and retraction speed of the mud-beating hydraulic cylinder 200; in this case, the above-mentioned double one-way throttle valve 204 can be omitted.

[0062] More preferably, such as Figure 3 A third hydraulically controlled check valve is installed on both the first mud-blasting hydraulic pipeline 208 and the second mud-blasting hydraulic pipeline 209. The control port of the third hydraulically controlled check valve on the first mud-blasting hydraulic pipeline 208 is connected to the second mud-blasting hydraulic pipeline 209, and the control port of the third hydraulically controlled check valve on the second mud-blasting hydraulic pipeline 209 is connected to the first mud-blasting hydraulic pipeline 208. After mud blasting is completed / after the mud-blasting hydraulic cylinder 200 retracts, the mud-blasting control directional valve 203 returns to the neutral position. Ports A and B (i.e., the two working ports) of the mud-blasting control directional valve 203 are both connected to the main return oil pipe 400. At this time, both third hydraulically controlled check valves lock the pipeline pressure, which keeps the mud-blasting hydraulic cylinder 200 stationary and prevents the mud from retreating into the mud-blasting chamber due to insufficient pressure in the mud-blasting hydraulic cylinder 200 before the mud has been baked and hardened by the high temperature in the furnace. Optionally, such as Figure 3 Two third hydraulically controlled check valves can be combined into a double hydraulically controlled check valve 205, which has a better effect on locking pressure.

[0063] Taking the electro-hydraulic directional valve 203 as an example, the working process of the above-mentioned mud gun mud-blasting hydraulic control system is roughly described as follows:

[0064] Taking the left side of the double one-way throttle valve 204 and the left side of the double hydraulic control check valve 205 connected to the first sludge removal hydraulic pipeline 208 as an example, when sludge removal begins, the solenoid of the sludge removal control directional valve 203 is energized, and the sludge removal control directional valve 203 is in the right valve position. The pressure oil flows through the second pressure oil branch pipe and the sludge removal control directional valve 203. Ports P and A, the left side of the dual hydraulic control check valve 205, and the left bypass check valve of the dual one-way throttle valve 204 (i.e., the bypass check valve of the first one-way throttle valve group) enter the rodless chamber of the sludge-driving hydraulic cylinder 200, pushing the piston rod to extend and start sludge-driving; at this time, the hydraulic oil in the rod chamber of the sludge-driving hydraulic cylinder 200 flows through the right side of the dual one-way throttle valve 204 (the bypass check valve of the second one-way throttle valve group is closed, and the return oil flows through the main valve core of the throttle valve group of the second one-way throttle valve group), the right side of the dual hydraulic control check valve 205 (the control oil port on the right side is connected to the first sludge-driving hydraulic pipeline 208, so the right one-way valve is open), the B and T ports of the sludge-driving control reversing valve 203, and the second return oil branch pipe back to the main return oil pipe 400. By adjusting the opening of the right main valve core of the dual one-way throttle valve 204 (that is, the opening of the throttle valve main valve core of the second one-way throttle valve group), the return oil flow of the sludge can be adjusted, thereby adjusting the sludge speed.

[0065] After the mud gun is returned to the standby position, if mud loading is required, the mud-loading hydraulic cylinder 200 needs to be retracted, energizing the solenoid of the mud-loading control directional valve 203. The mud-loading control directional valve 203 is then in the left valve position. Pressure oil flows through the second pressure oil branch pipe, the P and B ports of the mud-loading control directional valve 203, the right side of the double hydraulic control check valve 205, and the right side bypass check valve of the double one-way throttle valve 204 (i.e., the bypass check valve of the second one-way throttle valve group) into the rod chamber of the mud-loading hydraulic cylinder 200, pushing... The piston rod retracts; at this time, the hydraulic oil in the rodless chamber of the sludge-driving hydraulic cylinder 200 returns to the main return oil pipe 400 via the left side of the double one-way throttle valve 204 (the bypass one-way valve of the first one-way throttle valve group is closed, and the return oil flows through the main valve core of the throttle valve group), the left side of the double hydraulic control one-way valve 205 (the control port of the left side is connected to the second sludge-driving hydraulic pipeline 209, therefore, the left one-way valve is open), the A and T ports of the sludge-driving control reversing valve 203, and the second return oil branch pipe. By adjusting the opening degree of the left main valve core of the double one-way throttle valve 204 (that is, the opening degree of the main valve core of the throttle valve group of the first one-way throttle valve group), the return oil flow of the sludge-driving hydraulic cylinder 200 during retraction can be adjusted, thereby adjusting the retraction speed. After the mud-drying hydraulic cylinder 200 retracts, the mud-drying control directional valve 203 returns to the neutral position. Both ports A and B of the mud-drying control directional valve 203 are connected to the main return oil pipe 400. At this time, the left and right sides of the double hydraulic control check valve 205 lock the pipeline pressure, and the mud-drying hydraulic cylinder 200 remains stationary, so mud loading can begin.

[0066] like Figure 1 and Figure 3 In one embodiment, the mud gun hydraulic control system includes an automatic control mud gun hydraulic circuit 201 and a manual control mud gun hydraulic circuit 202, which are connected in parallel and connected to the mud gun hydraulic cylinder 200. The automatic control mud gun hydraulic circuit 201 and the manual control mud gun hydraulic circuit 202 can serve as backups for each other, thereby improving the reliability and safety of the mud gun mud gun operation.

[0067] In one embodiment, such as Figure 3 A flow meter 206 is installed on the second mud-blasting hydraulic pipeline 209 to monitor the hydraulic oil flow rate in the pipeline in real time. Especially during mud-blasting, it monitors the return oil flow of the mud-blasting hydraulic cylinder 200 in real time, calculates the stroke of the cylinder, and thus obtains the mud-blasting volume. This enables real-time monitoring of the mud-blasting volume, improving the reliability and safety of the mud-blasting operation, avoiding excessive mud blasting which increases the difficulty of the next taphole opening operation and causes mud waste, and preventing dangerous situations such as insufficient mud blasting leading to molten iron overflowing. A maintenance bypass can be installed on the second mud-blasting hydraulic pipeline 209 to facilitate the maintenance of the flow meter 206.

[0068] In one embodiment, such as Figure 3A third pressure measuring unit 207 is provided on the first mud-beating hydraulic pipeline 208. The structure of the third pressure measuring unit 207 can refer to the structure of the first pressure measuring unit 120, and will not be described in detail here. The third pressure measuring unit 207 can monitor the pressure change of the rodless chamber of the mud-beating hydraulic cylinder 200 in real time during the mud-beating process and judge the mud-beating progress: as the mud-beating amount increases, the pressure of the rodless chamber of the mud-beating hydraulic cylinder 200 also increases. When the mud-beating amount of the iron tap reaches the requirement, the pressure of the rodless chamber of the mud-beating hydraulic cylinder 200 rises to a certain value, indicating that the mud-beating is sufficient.

[0069] In particular, the flow meter 206 and the third pressure measuring unit 207 can serve as backups for each other and verify each other, further improving the monitoring of the mud gun mud-making operation and making it more reliable; moreover, it can also avoid the situation where the actual mud-making volume is too small, and even if there is damage to the taphole or mud bag, it can ensure that the mud-making volume is matched.

[0070] When an automatic control hydraulic circuit 201 and a manual control hydraulic circuit 202 are connected in parallel, such as Figure 3 The flow meter 206 is preferably installed on the hydraulic main pipe on the rod side of the mud-drying hydraulic cylinder 200 / the third pressure measuring unit 207 is preferably installed on the hydraulic main pipe on the rodless side of the mud-drying hydraulic cylinder 200. Example 3

[0071] like Figure 1 This utility model provides a mud gun hydraulic control system, including a rotary hydraulic cylinder 100 and a mud-pumping hydraulic cylinder 200. The rotary hydraulic cylinder 100 is equipped with a rotary hydraulic circuit, and the mud-pumping hydraulic cylinder 200 is equipped with a mud-pumping hydraulic circuit.

[0072] The rotary hydraulic circuit adopts the rotary hydraulic circuit provided in Embodiment 1 above, and / or the mud-pumping hydraulic circuit adopts the rotary hydraulic circuit provided in Embodiment 2 above. The specific structure is not described in detail here.

[0073] This embodiment also provides a mud gun operation method, wherein a rotary hydraulic cylinder 100 is driven by a rotary hydraulic circuit to move the mud gun forward to the mud-spraying position or back to the standby position; the relevant control method of the rotary hydraulic cylinder 100 can be referred to the relevant content in Embodiment 1, and will not be repeated here;

[0074] The mud-beating hydraulic cylinder 200 is driven by the mud-beating hydraulic circuit to extend the piston rod of the mud-beating hydraulic cylinder 200 to beat mud or retract it to load mud. The relevant control method of the mud-beating hydraulic cylinder 200 can be referred to the relevant content in Embodiment 2, and will not be repeated here. Example 4

[0075] This utility model provides a mud gun hydraulic control system, including a mud gun hydraulic cylinder and a hydraulic control circuit. The hydraulic control circuit includes a rodless chamber hydraulic line connected to the rodless chamber of the mud gun hydraulic cylinder and a rod chamber hydraulic line connected to the rod chamber of the mud gun hydraulic cylinder.

[0076] like Figures 1-3 Preferably, an anti-pressure shock module is provided between the rodless chamber hydraulic pipeline and the rod chamber hydraulic pipeline. The anti-pressure shock module includes a transition pipe (shown in the figure, not labeled), which includes two transition branch pipes (shown in the figure, not labeled) and a bridge pipe (shown in the figure, not labeled). The two transition branch pipes are connected in parallel and then connected to the rodless chamber hydraulic pipeline and the rod chamber hydraulic pipeline respectively through a transition main pipe. The two ends of the bridge pipe are respectively connected to the two transition branch pipes, and an anti-surge overflow valve 601 is provided on the bridge pipe. Each transition branch pipe... Each of the two transition branches is equipped with two anti-impact check valves 602, which are located on both sides of the bridge pipe connection. The two anti-impact check valves 602 on each transition branch have opposite conduction directions. The two anti-impact check valves 602 on each side of the bridge pipe, located on the two transition branches, have opposite conduction directions (that is, the two anti-impact check valves 602 on the side of the transition branch closer to the rodless chamber hydraulic line have opposite conduction directions, and the two anti-impact check valves 602 on the side of the transition branch closer to the rod chamber hydraulic line have opposite conduction directions).

[0077] Among them, the aforementioned anti-impact relief valve 601 can be a direct-acting relief valve, and the anti-impact relief valve 601 has an upper limit value for impact pressure; the aforementioned anti-impact check valve 602 can be a cartridge check valve.

[0078] In the direction from the rodless chamber hydraulic line to the rod chamber hydraulic line, the two anti-impact check valves 602 on one of the transition branches are defined as the first anti-impact check valve 602 and the second anti-impact check valve 602, respectively, and the two anti-impact check valves 602 on the other transition branch are defined as the third anti-impact check valve 602 and the fourth anti-impact check valve 602, respectively. When a hydraulic pressure shock occurs in the rodless chamber hydraulic line, and the oil pressure instantaneously rises to the upper limit of the shock pressure set by the anti-shock relief valve 601, the anti-shock relief valve 601 opens. At this time, the high-pressure oil in the rodless chamber hydraulic line enters the rod chamber hydraulic line through the first anti-shock check valve 602, the anti-shock relief valve 601, and the fourth anti-shock check valve 602. On the one hand, this reduces the oil pressure in the rodless chamber hydraulic line to below the upper limit of the shock pressure; on the other hand, it increases the oil pressure in the rod chamber hydraulic line and the rod chamber of the mud gun hydraulic cylinder, thus counteracting the oil pressure in the rodless chamber of the mud gun hydraulic cylinder, greatly reducing pressure shock, and effectively protecting the mud gun hydraulic cylinder. When the rod chamber hydraulic line experiences an oil pressure shock, and the oil pressure instantly rises to the upper limit of the shock pressure set by the anti-shock relief valve 601, the anti-shock relief valve 601 opens. At this time, the high-pressure oil in the rod chamber hydraulic line enters the rodless chamber hydraulic line through the second anti-shock check valve 602, the anti-shock relief valve 601, and the third anti-shock check valve 602. This reduces the oil pressure in the rod chamber hydraulic line to below the upper limit of the shock pressure, while increasing the oil pressure in the rodless chamber hydraulic line and the rodless chamber of the mud gun hydraulic cylinder. This counteracts the oil pressure in the rod chamber of the mud gun hydraulic cylinder, greatly reducing pressure shock and effectively protecting the mud gun hydraulic cylinder.

[0079] The mud cannon rotates at high speed and with a large amplitude, and the hydraulic system operates at high pressure. When the mud cannon hits the iron taphole or returns to the standby position, it often generates a huge impact force. The hydraulic pressure in the mud cannon's hydraulic cylinder rises sharply in an instant. Since the mud cannon itself is a cantilever structure, this pressure impact will have a certain adverse effect on the hydraulic system of the mud cannon's hydraulic cylinder, the mechanical structure of the mud cannon itself, and the base. In this embodiment, by setting an anti-pressure impact module, this pressure impact can be effectively mitigated, thereby improving the stability, safety, and lifespan of the mud cannon.

[0080] The mud cannon hydraulic control system provided in this embodiment can be applied to Embodiments 1 to 3 above. Example 5

[0081] This utility model provides a hydraulic control system for a mud gun, including a main pressure oil pipe 300, a main return oil pipe 400, and a hydraulic control circuit. The hydraulic control circuit is equipped with a main control directional valve. The pressure port of the main control directional valve is connected to the main pressure oil pipe 300 through a pressure oil branch pipe, and the return oil port of the main control directional valve is connected to the main return oil pipe 400 through a return oil branch pipe.

[0082] In one embodiment, such as Figures 1-3The mud gun hydraulic control system also includes a safety lock-up module, which includes a safety control directional valve 302 and a safety control check valve 301. The safety control check valve 301 is installed on the main pressure oil pipe 300. The control port of the safety control check valve 301 is connected to one of the working ports of the safety control directional valve 302. The pressure port of the safety control directional valve 302 is connected to the main pressure oil pipe 300, and the return port of the safety control directional valve 302 is connected to the main return oil pipe 400.

[0083] The aforementioned safety control directional valve 302 is preferably an electromagnetic directional valve, including but not limited to a two-position four-way directional valve; the aforementioned safety control check valve 301 includes but is not limited to a cartridge check valve.

[0084] During normal operation, the solenoid of the safety control directional valve 302 is de-energized, placing it in the right valve position. The control port X of the safety control check valve 301 is connected to the main return oil pipe 400, and the main valve core of the safety control check valve 301 is open, allowing pressure oil from the main pressure oil pipe 300 to enter the hydraulic control circuit and complete the relevant actions of the mud gun. When the mud gun does not need to operate, or when the mud gun and furnace front area are under maintenance, the solenoid of the safety control directional valve 302 is energized, placing it in the left valve position. The control port X of the safety control check valve 301 is connected to the main pressure oil pipe 300, and the main valve core of the safety control check valve 301 is closed, preventing pressure oil from entering the hydraulic control circuit and thus preventing the mud gun from operating. How can safety be ensured?

[0085] In one embodiment, such as Figures 1-3 A high-pressure filter 303 is installed on the main pressure oil pipe 300 to ensure that the pressure oil entering the hydraulic control circuit is clean, thereby improving the reliability of the mud gun operation and the service life of various components in the mud gun hydraulic control system.

[0086] The mud cannon hydraulic control system provided in this embodiment can be applied to Embodiments 1 to 4 above.

[0087] In one embodiment, such as Figures 1-3 A fourth pressure measuring unit (shown in the diagram but not labeled) is installed on the main pressure oil pipe 300, which can monitor the pressure on the main pressure oil pipe 300 in real time.

[0088] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A hydraulic control system for a mud gun, comprising a main pressure oil pipe, a main return oil pipe, and a hydraulic control circuit, wherein a main control directional valve is provided on the hydraulic control circuit, the pressure port of the main control directional valve is connected to the main pressure oil pipe via a pressure oil branch pipe, and the return oil port of the main control directional valve is connected to the main return oil pipe via a return oil branch pipe, characterized in that, It also includes a safety lock-up module, which includes a safety control directional valve and a safety control check valve. The safety control check valve is installed on the main pressure oil pipe. The control port of the safety control check valve is connected to one of the working ports of the safety control directional valve. The pressure port of the safety control directional valve is connected to the main pressure oil pipe. The return port of the safety control directional valve is connected to the main return oil pipe.

2. The mud gun hydraulic control system as described in claim 1, characterized in that: The safety control directional valve is an electromagnetic directional valve.

3. The mud gun hydraulic control system as described in claim 2, characterized in that: The safety control directional valve is a two-position four-way directional valve.

4. The mud gun hydraulic control system as described in claim 1, characterized in that: The safety control check valve is a cartridge-type check valve.

5. The mud gun hydraulic control system as described in claim 1, characterized in that: A high-pressure filter is installed on the main pressure oil pipe.

6. The mud gun hydraulic control system as described in any one of claims 1 to 5, characterized in that: There are two hydraulic cylinders for the mud gun: a rotary hydraulic cylinder and a mud-beating hydraulic cylinder. The hydraulic control circuits are divided into two sets, including a rotary hydraulic circuit connected to the rotary hydraulic cylinder and a mud-beating hydraulic circuit connected to the mud-beating hydraulic cylinder.

7. The mud gun hydraulic control system as described in claim 6, characterized in that: The main control directional valve in the rotary hydraulic circuit is an electro-hydraulic proportional valve.

8. The mud gun hydraulic control system as described in claim 6, characterized in that: The sludge-beating hydraulic circuit includes a first sludge-beating hydraulic pipeline connected to the rodless chamber of the sludge-beating hydraulic cylinder and a second sludge-beating hydraulic pipeline connected to the rod chamber of the sludge-beating hydraulic cylinder; the sludge-beating hydraulic circuit is also equipped with a double one-way throttle valve, wherein the first one-way throttle valve group of the double one-way throttle valve is disposed on the first sludge-beating hydraulic pipeline, and the second one-way throttle valve group of the double one-way throttle valve is disposed on the second sludge-beating hydraulic pipeline.

9. The mud gun hydraulic control system as described in claim 1, characterized in that: The return oil branch pipe is equipped with a check valve, and its conduction direction is from the main control directional valve to the main return oil pipe.

10. The mud gun hydraulic control system as described in claim 1, characterized in that: The main pressure oil pipe is equipped with a pressure measuring unit.

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