Mud gun hydraulic control system capable of preventing pressure impact

Abstract

The utility model relates to a mud gun hydraulic control system capable of preventing pressure impact, which comprises a mud gun hydraulic cylinder and a hydraulic control loop provided with a pressure impact preventing module, the pressure impact preventing module comprises two transition branch pipes and a bridging pipe, the two transition branch pipes are connected in parallel and then are respectively connected with a rodless cavity hydraulic pipeline and a rod cavity hydraulic pipeline, and the bridging pipe is connected with the rodless cavity hydraulic pipeline. The two ends of the bridging pipe are connected to the two transition branch pipes in a bypass mode respectively, an anti-impact overflow valve is arranged on the bridging pipe, each transition branch pipe is provided with two anti-impact one-way valves, the two anti-impact one-way valves are arranged on the two sides of a bypass connection point of the bridging pipe respectively, and the conduction directions of the two anti-impact one-way valves on each transition branch pipe are opposite. And the conduction directions of the two anti-impact one-way valves arranged on the two transition branch pipes on each side of the bridging pipe are opposite. The pressure impact prevention module can well relieve hydraulic system pressure impact generated in the clay gun operation process, the action stability and safety of the clay gun are improved, and the service life of the clay gun is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to blast furnace ironmaking technical field, concretely relates to a mud gun hydraulic control system of pressure impact prevention. BACKGROUND

[0002] In the field of blast furnace ironmaking, after the blast furnace finishes tapping molten iron, the mud gun needs to be used to support the iron notch, and then the mud gun is hit to block the iron notch to continue smelting. Due to high temperature and high pressure in the furnace, it is necessary to ensure that the rodless cavity of the mud gun rotary hydraulic cylinder cannot be depressurized after the mud gun supports the iron notch, at this time, the pressure in the furnace can be overcome, and the mud gun can be ensured not to run mud and not to pour molten iron when hitting mud; at the same time, the speed of the mud gun rotating into the iron notch should be fast enough to reduce the contact time of the nozzle and the iron notch flowing out of the molten iron in the rotating process, so as to avoid burning the nozzle. During the mud hitting process, the amount of mud hitting should be observed in real time to ensure that the amount of mud hitting is appropriate, to avoid the risk of less mud hitting and molten iron pouring, and to avoid the situation of more mud hitting, waste, and difficulty in next time tapping the iron notch.

[0003] The mud gun rotates fast, the amplitude is large, the hydraulic system pressure is high, when the mud gun hits the iron notch or retreats to the standby position, a huge impact force is often generated, the oil pressure of the mud gun hydraulic cylinder rises greatly, and the mud gun itself is a cantilever structure. This pressure impact will bring certain adverse effects to the hydraulic system of the mud gun hydraulic cylinder, the mechanical structure of the mud gun itself and the base. At present, the existing technology lacks research and control measures for this pressure impact during the operation of the mud gun. CONTENT OF THE UTILITY MODEL

[0004] The utility model relates to a mud gun hydraulic control system of pressure impact prevention, and at least can solve part of defects of prior art.

[0005] The utility model relates to a mud gun hydraulic control system of pressure impact prevention, and at least can solve part of defects of prior art.

[0006] As one of the implementation manners, the anti-impact overflow valve adopts a direct-acting overflow valve.

[0007] As one of the embodiments, the anti-impact check valve is a plug-in check valve.

[0008] As one of the embodiments, the mud gun hydraulic cylinder has two, namely a rotating hydraulic cylinder and a mud hitting hydraulic cylinder, and the hydraulic control circuit has two corresponding groups, including a rotating hydraulic circuit connected with the rotating hydraulic cylinder and a mud hitting hydraulic circuit connected with the mud hitting hydraulic cylinder; the rotating hydraulic circuit and / or the mud hitting hydraulic circuit is provided with the anti-pressure impact module.

[0009] As one of the embodiments, the rotating hydraulic circuit includes an automatic control rotating hydraulic circuit and a manual control rotating hydraulic circuit, which are connected in parallel and connected with the rotating hydraulic cylinder; the automatic control rotating hydraulic circuit and / or the manual control rotating hydraulic circuit is provided with the anti-pressure impact module.

[0010] As one of the embodiments, the mud hitting hydraulic circuit includes an automatic control mud hitting hydraulic circuit and a manual control mud hitting hydraulic circuit, which are connected in parallel and connected with the mud hitting hydraulic cylinder; the automatic control mud hitting hydraulic circuit and / or the manual control mud hitting hydraulic circuit is provided with the anti-pressure impact module.

[0011] As one of the embodiments, the hydraulic control circuit further includes a main control reversing valve, a pressure port of the main control reversing valve is connected with a main pressure oil pipe through a pressure oil branch pipe, a back oil port of the main control reversing valve is connected with a main back oil pipe through a back oil branch pipe, and a rodless cavity hydraulic pipe and a rod cavity hydraulic pipe are connected with two working oil ports of the main control reversing valve respectively.

[0012] As one of the embodiments, the main control reversing valve is an electro-hydraulic proportional valve.

[0013] As one of the embodiments, the mud gun hydraulic cylinder is a mud hitting hydraulic cylinder, the hydraulic control circuit is a mud hitting hydraulic circuit, the mud hitting hydraulic circuit is provided with a double check valve, a first check valve group of the double check valve is arranged on the rodless cavity hydraulic pipe, and a second check valve group of the double check valve is arranged on the rod cavity hydraulic pipe.

[0014] As one of the embodiments, the mud gun hydraulic cylinder is a mud hitting hydraulic cylinder, the hydraulic control circuit is a mud hitting hydraulic circuit, and a flowmeter is arranged on the rod cavity hydraulic pipe.

[0015] The utility model at least has following beneficial effect:

[0016] In the utility model, through setting anti-pressure impact module, hydraulic system pressure impact produced in mud gun operation process can be relieved preferably, mud gun action stability, safety and life are improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described below are only some of the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0018] Figure 1 The structure diagram of the mud gun hydraulic control system provided by the embodiment of the present application is shown in the figure.

[0019] Figure 2 The structure diagram of the mud gun rotary hydraulic control system provided by the embodiment of the present application is shown in the figure.

[0020] Figure 3 The structure diagram of the mud gun mud hitting hydraulic control system provided by the embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0022] Embodiment one

[0023] As Figure 1 and Figure 2 The embodiment of the present application provides a mud gun rotary hydraulic control system, which comprises a rotary hydraulic cylinder 100 and a rotary hydraulic circuit,

[0024] The rotary hydraulic circuit comprises a rotary control reversing valve 105, a first rotary hydraulic pipeline 103 connected with a rodless cavity of the rotary hydraulic cylinder 100, and a second rotary hydraulic pipeline 104 connected with a rod cavity of the rotary hydraulic cylinder 100,

[0025] The pressure port of the rotary control reversing valve 105 is connected with a first pressure oil branch pipe (not shown, not labeled) for being connected with a main pressure oil pipe 300, and the oil return port of the rotary control reversing valve 105 is connected with a first oil return branch pipe (not shown, not labeled) for being connected with a main oil return pipe 400; the first rotary hydraulic pipeline 103 and the second rotary hydraulic pipeline 104 are respectively connected with two working oil ports of the rotary control reversing valve 105;

[0026] A cut-off valve (not shown, not labeled) is arranged on each of the first rotary hydraulic pipeline 103, the second rotary hydraulic pipeline 104 and the first pressure oil branch, which includes but is not limited to a ball valve.

[0027] In one embodiment, the first rotary hydraulic pipeline 103 is connected to the second rotary hydraulic pipeline 104 through a rotary control reversing valve 105. Figure 2 A first check valve (not shown, not labeled) is arranged on the first return oil branch, which includes but is not limited to a tubular check valve, and can prevent the hydraulic oil in the main return oil pipe 400 from flowing back to the first return oil branch to cause misoperation or oil leakage.

[0028] In one embodiment, the rotary hydraulic circuit is an automatic control circuit, and the rotary control reversing valve 105 is an electro-hydraulic proportional valve. During a first operation process, the opening degree of the electro-hydraulic proportional valve is adjusted by adjusting the instantaneous input signal of the electro-hydraulic proportional valve, and then the hydraulic oil flow through the electro-hydraulic proportional valve is adjusted, so that the rotary speed of the clay gun can be adjusted in real time. Because the clay gun has large weight and inertia, the slow speed during the rotary start and return to standby position is beneficial to reduce vibration and impact and protect the clay gun, and the fast speed during the approach to the iron mouth is beneficial to avoid the burning of the gun nozzle by molten iron. Therefore, the real-time adjustment of the rotary speed of the clay gun by the electro-hydraulic proportional valve can improve the reliability and safety of the operation of the clay gun.

[0029] In one embodiment, the first rotary hydraulic pipeline 103 is connected to the second rotary hydraulic pipeline 104 through a rotary control reversing valve 105. Figure 2 A sequence valve 106 is arranged on the second rotary hydraulic pipeline 104, and an overflow bypass is connected between the first rotary hydraulic pipeline 103 and the second rotary hydraulic pipeline 104, and a bypass overflow valve 107 and a bypass check valve 108 are arranged on the overflow bypass. Specifically, the sequence valve 106 is located between the overflow bypass and the rotary control reversing valve 105. In detail, the bypass connection point of the overflow bypass on the first rotary hydraulic pipeline 103 is defined as a first bypass connection point, and the bypass connection point of the overflow bypass on the second rotary hydraulic pipeline 104 is defined as a second bypass connection point. On the second rotary hydraulic pipeline 104, the sequence valve 106 is located on the side close to the rotary control reversing valve 105 of the second bypass connection point. On the overflow bypass, the first bypass connection point, the bypass check valve 108, the bypass overflow valve 107 and the second bypass connection point are arranged in sequence. The control oil source pipe of the sequence valve 106 is bypassed on the first rotary hydraulic pipeline 103, and the conduction direction of the bypass check valve 108 is from the second bypass connection point to the first bypass connection point.

[0030] Preferably, the sequence valve 106 is a pilot sequence valve, and the bypass overflow valve 107 is a pilot overflow valve, which can more accurately control the rotary hydraulic circuit. The bypass check valve 108 includes but is not limited to a plate check valve.

[0031] Based on the above design, the hydraulic oil in the rod cavity of the rotary hydraulic cylinder 100 is supplied to the sequential valve 106 and the bypass overflow valve 107 inlet through the second rotary hydraulic pipeline 104. The opening pressure of the sequential valve 106 is preferably set to be the system pressure, the control oil port X of the sequential valve 106 is connected to the first rotary hydraulic pipeline 103, and the load is small during the advance of the mud gun. The working pressure of the first rotary hydraulic pipeline 103 is lower than the system pressure, so the sequential valve 106 is not opened, and the side-by-side one-way valve of the sequential valve 106 is not communicated. The opening pressure of the bypass overflow valve 107 is set to be lower (much lower than the system pressure), the control oil port X of the bypass overflow valve 107 is connected to the second rotary hydraulic pipeline 104, and the second rotary hydraulic pipeline 104 is connected to the main oil return pipe 400 at this time, so the pressure is low. When the piston rod of the rotary hydraulic cylinder 100 is extended, the oil pressure between the rod cavity of the rotary hydraulic cylinder 100 and the sequential valve 106 rises to the opening pressure of the bypass overflow valve 107 (at this time, the sequential valve 106 is still closed), the bypass overflow valve 107 is opened, the hydraulic oil in the rod cavity is supplemented to the first rotary hydraulic pipeline 103 through the bypass overflow valve 107 and the bypass one-way valve 108, and the rotary hydraulic cylinder 100 is supplemented with oil, which is beneficial to meet the maximum speed requirement of the rotary of the mud gun and improve the response speed of the rotary of the mud gun.

[0032] After the rotary of the mud gun reaches the working position and the nozzle of the mud gun is pressed against the iron mouth, the rotary control reversing valve 105 returns to the neutral position, and the valve core does not act. At this time, the pressure of the first rotary hydraulic pipeline 103 rises to the system pressure, the sequential valve 106 is opened, the hydraulic oil in the second rotary hydraulic pipeline 104 is returned to the main oil return pipe 400 through the sequential valve 106, and the pressure of the rod cavity is released. In this way, the pressure of the rodless cavity is used to press against the iron mouth, and the oil pressure of the rod cavity is not offset, so that sufficient sealing pressure between the mud and the iron mouth during mud hitting can be ensured, and mud running can be prevented.

[0033] In one of the embodiments, as shown in Figure 2 A first hydraulic control one-way valve 109 is arranged on the first rotary hydraulic pipeline 103. The outlet of the first hydraulic control one-way valve 109 is a passage port close to the rodless cavity of the rotary hydraulic cylinder. The control oil port of the first hydraulic control one-way valve 109 is connected to the second rotary hydraulic pipeline 104. The first hydraulic control one-way valve 109 can play a role in maintaining the pressure of the rodless cavity. When the overflow bypass is arranged, the first bypass connection point is preferably located between the first hydraulic control one-way valve 109 and the rotary hydraulic cylinder 100. Specifically, after the mud gun is pressed against the iron mouth, the hydraulic oil in the second rotary hydraulic pipeline 104 is returned to the main oil return pipe 400 through the sequential valve 106, the control oil port X of the first hydraulic control one-way valve 109 has low pressure, and the hydraulic control one-way valve is closed at this time. When the overflow bypass is arranged, the bypass one-way valve 108 is also not communicated, so the oil pressure between the rodless cavity of the rotary hydraulic cylinder 100 and the first hydraulic control one-way valve 109 is locked, the rotary hydraulic cylinder 100 is locked to press against the iron mouth, and the working reliability of the mud gun is ensured.

[0034] When the muck gun advances, the rotary control reversing valve 105 acts (for example, in the right valve position), and the pressure oil enters the rodless chamber of the muck gun rotary hydraulic cylinder through the first pressure oil branch pipe, the rotary control reversing valve 105 and the first rotary hydraulic pipe 103 in turn, pushes the piston rod to extend, and the muck gun advances.

[0035] When the muck gun returns, the rotary control reversing valve 105 acts (if the rotary control reversing valve 105 is in the right valve position when the muck gun advances, then the rotary control reversing valve 105 is in the left valve position when the muck gun returns), and the pressure oil enters the rod chamber of the muck gun rotary hydraulic cylinder through the first pressure oil branch pipe, the rotary control reversing valve 105, the bypass check valve of the sequence valve 106 (in this direction, the oil can pass), and the inlet of the bypass overflow valve 107. Since the control oil port X of the bypass overflow valve 107 is connected to the second rotary hydraulic pipe 104, and the oil pressure of the second rotary hydraulic pipe 104 is high at this time, the bypass overflow valve 107 does not open, the pressure oil enters the rod chamber of the muck gun rotary hydraulic cylinder 100 through the second rotary hydraulic pipe 104, pushes the piston rod to retract, and the muck gun returns. At this time, the hydraulic oil in the rodless chamber of the rotary hydraulic cylinder 100 enters the oil tank through the first rotary hydraulic pipe 103 and the oil inlet of the first hydraulic control check valve 109. Since the control oil port of the first hydraulic control check valve 109 is connected to the second rotary hydraulic pipe 104, and the oil pressure of the second rotary hydraulic pipe 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 reversing valve 105 and the first oil return branch pipe.

[0036] In one embodiment, as Figure 2 , the rotary hydraulic circuit further comprises a first pressure maintaining pipe (not shown, not labeled), a first end of the first pressure maintaining pipe is connected to the first pressure oil branch pipe, and a second end of the first pressure maintaining pipe is connected to the first rotary hydraulic pipe 103;

[0037] When the first rotary hydraulic pipe 103 is provided with the first hydraulic control check valve 109, the second end of the first pressure maintaining pipe is preferably located between the first hydraulic control check valve 109 and the rotary hydraulic cylinder 100;

[0038] The first pressure maintaining pipe is provided with the second hydraulic control check valve 110 and is provided with a pressure maintaining control module for controlling the opening and closing of the second hydraulic control check valve 110, wherein, preferably, as Figure 2 , the pressure maintaining control module comprises a pressure maintaining control bypass (not shown, not labeled) and a pressure maintaining reversing valve 111, a first end of the pressure maintaining control bypass is connected to the first pressure oil branch pipe / first pressure maintaining pipe, a second end of the pressure maintaining control bypass is connected to the pressure port of the pressure maintaining reversing valve 111, an oil return port of the pressure maintaining reversing valve 111 is connected to a first oil drain branch pipe for connecting to the main oil drain pipe 500, and one of the working oil ports of the pressure maintaining reversing valve 111 is in communication with the control oil port of the second hydraulic control check valve 110.

[0039] When the first end of the pressure maintaining control bypass is connected in parallel on the first pressure maintaining pipeline, the first end is located between the first end of the first pressure maintaining pipeline and the second hydraulic control check valve 110.

[0040] When the rodless cavity pressure of the rotary hydraulic cylinder 100 drops too fast, a mud running condition may occur, affecting the normal work of the mud gun, and even causing dangerous situations such as molten iron spouting; by setting the first pressure maintaining pipeline, hydraulic oil can be supplemented to the first rotary hydraulic pipeline 103, improving the stability of the rodless cavity pressure of the rotary hydraulic cylinder 100.

[0041] The pressure maintaining reversing valve 111 is preferably an electromagnetic reversing valve, which is convenient for automatic control, including but not limited to a two-position four-way electromagnetic reversing valve.

[0042] Among them, for example, Figure 2 A first pressure measuring unit 120 is arranged on the first rotary hydraulic pipeline 103 for real-time detection of the oil pressure in the first rotary hydraulic pipeline 103. When the rodless cavity of the rotary hydraulic cylinder 100 is pressure maintained, the pressure of the rodless cavity of the rotary hydraulic cylinder 100 can be detected by the first pressure measuring unit 120. The mud gun rotary hydraulic control system further comprises a central controller, and the pressure maintaining reversing valve 111 and the first pressure measuring unit 120 are electrically connected or communicatively connected to the central controller. The first pressure measuring unit 120 includes but is not limited to a pressure measuring and venting connector installed on the first rotary hydraulic pipeline 103, and a pressure gauge connected to the pressure measuring and venting connector through a pressure measuring hose.

[0043] Further preferably, for example, Figure 2 A second check valve 112 is further arranged on the first pressure maintaining pipeline, and the second check valve 112 is located between the second hydraulic control check valve 110 and the second end of the first pressure maintaining pipeline. The second check valve 112 is in a conductive direction from the second hydraulic control check valve 110 to the second end of the first pressure maintaining pipeline. The second check valve 112 can ensure that the oil in the rodless cavity of the rotary hydraulic cylinder 100 and the first rotary hydraulic pipeline 103 does not flow in the reverse direction to the second hydraulic control check valve 110, causing misoperation.

[0044] The working of the first pressure maintaining pipeline will be described below with the pressure maintaining reversing valve 111 as an example of a two-position four-way electromagnetic reversing valve:

[0045] When the mud gun is pressed against the iron mouth and the pressure in the rodless cavity of the rotary hydraulic cylinder 100 drops rapidly, the solenoid of the two-position four-way electromagnetic reversing valve is energized, and the two-position four-way electromagnetic reversing valve is in the left valve position. The pressure oil passes through the first pressure oil branch pipe, the pressure maintaining control bypass, the P port and the B port of the pressure maintaining reversing 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 is opened, and the pressure oil is further supplemented into the first rotary hydraulic pipeline 103 through the second hydraulic control check valve 110, so as to ensure that the pressure in the rodless cavity of the rotary hydraulic cylinder 100 does not drop, and the mud gun works normally. If the rodless cavity of the rotary hydraulic cylinder 100 does not need pressure maintaining, the solenoid of the two-position four-way electromagnetic reversing valve is de-energized, and the two-position four-way electromagnetic reversing 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 oil return pipe 500, and the second hydraulic control check valve 110 is not opened. Therefore, the pressure oil cannot be supplemented into the first rotary hydraulic pipeline 103.

[0046] In one embodiment, the rotary hydraulic circuit further comprises a second pressure maintaining pipeline (not shown), one end of the second pressure maintaining pipeline is provided with an accumulator 113 for storing pressure oil, and the outlet end of the second pressure maintaining pipeline is in communication with the rodless cavity of the rotary hydraulic cylinder 100. A safety valve 114 is arranged on the second pressure maintaining pipeline and located between the accumulator 113 and the outlet end of the second pressure maintaining pipeline, and is used to control the opening and closing of the second pressure maintaining pipeline. The safety valve 114 includes but is not limited to a ball valve.

[0047] Further, as shown in FIG. 1, Figure 2 , the second pressure maintaining pipeline is connected with a drain bypass, and an unloading ball valve 115 is arranged on the drain bypass. The drain bypass can be connected to the main oil return pipe 400. Further, an overflow branch can be connected to the second pressure maintaining pipeline. The overflow branch can also be connected to the drain bypass and located on both sides of the unloading ball valve 115. A branch overflow valve 116 is arranged on the overflow branch. When the accumulator 113 needs to be unloaded for maintenance or the pressure in the accumulator 113 exceeds the safety pressure set by the branch overflow valve 116, the pressure oil in the accumulator 113 can be drained to the main oil return pipe 400. The safety valve 114, the unloading ball valve 115 and the branch overflow valve 116 can be combined into a safety valve 114 group.

[0048] The second pressure maintaining pipeline can be connected to the first rotary hydraulic pipeline 103. In another embodiment, as shown in FIG. 2, Figure 2 , when the first pressure maintaining pipeline and the second pressure maintaining pipeline are both provided, the second pressure maintaining pipeline can also be connected to the first pressure maintaining pipeline. When the first rotary hydraulic pipeline 103 / the first pressure maintaining pipeline is filled with oil, the safety valve 114 is opened, and the pressure oil can also be supplemented into the accumulator 113.

[0049] In the second pressure maintaining pipeline is connected to the first pressure maintaining pipeline, for example, as Figure 2 The third one-way valve 117 is further arranged on the first pressure maintaining pipeline, and the conducting direction of the third one-way valve 117 is from the first end of the first pressure maintaining pipeline to the second hydraulic control one-way valve 110, so that the pressure oil stored in the accumulator 113 is only used for pressure maintaining, and cannot flow back into the main pressure oil pipeline 300 due to low pressure of the main pressure oil pipeline 300, and the accumulator 113 always stores sufficient pressure oil for pressure maintaining.

[0050] The pressure oil stored in the accumulator 113 can be supplemented to the rodless cavity of the rotary hydraulic cylinder 100, so that even if the pump station stops supplying pressure oil due to power failure, the pressure maintaining effect of the rodless cavity of the rotary hydraulic cylinder can be ensured by the pressure oil stored in the accumulator 113, and the safe and reliable operation of the mud gun is ensured. Moreover, after the mud is shot, the mud gun needs to be pressed against the iron mouth for 15-30 minutes until the shot mud is baked and hardened, and since the accumulator 113 is arranged, the hydraulic pump of the pump station can be stopped, and only the pressure oil stored in the accumulator 113 is used for pressure maintaining, so that energy saving is achieved.

[0051] As shown in FIG. 1, Figure 2 A second pressure measuring unit (not shown) can be arranged on the second rotary hydraulic pipeline 104, and the structure of the second pressure measuring unit can refer to the structure of the first pressure measuring unit 120, which is not described herein.

[0052] The rotary hydraulic circuit provided by the embodiment can be an automatic control circuit, and as described above, the rotary control reversing valve 105 can be an electro-hydraulic proportional valve, and the pressure maintaining reversing valve 111 can be an electromagnetic reversing valve. The rotary hydraulic circuit provided by the embodiment can also be a manual control circuit, and the rotary control reversing valve 105 and the pressure maintaining reversing valve 111 are both manual reversing valves.

[0053] As shown in FIG. 1, Figure 1 And Figure 2 A manually controlled rotary hydraulic circuit is provided, and since the manual reversing valve does not have the function of adjusting the flow rate in real time, the one-way oil return throttle valve 118 and the one-way oil inlet throttle valve 119 are arranged on the first rotary hydraulic pipeline 103, and the speed of the mud gun in the backward direction and the speed of the mud gun in the forward direction can be adjusted, respectively, wherein the one-way oil return throttle valve 118 is located on the side of the one-way oil inlet throttle valve 119 away from the rotary hydraulic cylinder 100.

[0054] Wherein, in order to avoid the mud gun from stalling due to its own weight when retreating, the oil return throttle valve is used to regulate the speed, because the standby position is low in the mud gun rotating track. When the mud gun retreats, the rodless cavity hydraulic oil of the rotating hydraulic cylinder 100 is bypassed through the left side of the one-way valve of the one-way oil inlet throttle valve 119, and the one-way oil return throttle valve 118 is returned to the tank through the throttle valve core, and the flow is adjusted through the throttle valve core of the one-way oil return throttle valve 118, thereby adjusting the speed of the mud gun retreating, and establishing back pressure to overcome the influence of the weight of the mud gun, avoiding stalling and large vibration. When the mud gun advances, the flow of hydraulic oil in the first rotating hydraulic pipeline 103 is large and the pressure is high, in order to avoid unnecessary energy consumption and heating caused by high back pressure, the oil inlet throttle is used to regulate the speed; specifically, when the mud gun advances, the pressure oil enters the rodless cavity of the rotating hydraulic cylinder 100 through the left side of the one-way valve of the one-way oil return throttle valve 118 and the throttle valve core of the one-way oil inlet throttle valve 119, and the flow is adjusted through the throttle valve core of the one-way oil inlet throttle valve 119, thereby adjusting the speed of the mud gun advancing. Based on the above operation, according to the different working condition requirements of the mud gun advancing and retreating, the oil inlet and oil return throttle speed regulation modes are selected respectively, which is more beneficial to the operation of the mud gun and improves the stability and reliability of the mud gun work.

[0055] As Figure 1 and Figure 2 In one embodiment, the mud gun rotating hydraulic control system comprises an automatic control rotating hydraulic circuit 101 and a manual control rotating hydraulic circuit 102, which are connected in parallel with the rotating hydraulic cylinder 100, and the automatic control rotating hydraulic circuit 101 and the manual control rotating hydraulic circuit 102 can be used as backup for each other, thereby improving the reliability and safety of the mud gun rotating operation.

[0056] Embodiment two

[0057] As Figure 1 and Figure 3 The utility model embodiment provides a mud gun mud making hydraulic control system, comprising a mud making hydraulic cylinder 200 and a mud making hydraulic circuit,

[0058] The mud making hydraulic circuit comprises a mud making control reversing valve 203, a first mud making hydraulic pipeline 208 connected with the rodless cavity of the mud making hydraulic cylinder 200, and a second mud making hydraulic pipeline 209 connected with the rod cavity of the mud making hydraulic cylinder 200,

[0059] The pressure port of the mud making control reversing valve 203 is connected with a second pressure oil branch pipe (not shown, not labeled) for being connected with the main pressure oil pipe 300, and the oil return port of the mud making control reversing valve 203 is connected with a second oil return branch pipe (not shown, not labeled) for being connected with the main oil return pipe 400; the first mud making hydraulic pipeline 208 and the second mud making hydraulic pipeline 209 are connected with two working oil ports of the mud making control reversing valve 203 respectively;

[0060] The first mud-packing hydraulic pipeline 208, the second mud-packing hydraulic pipeline 209 and the second pressure oil branch are each provided with a shut-off valve (not shown and not labeled), which includes but is not limited to a ball valve.

[0061] In one of the embodiments, as Figure 3 A fourth one-way valve (not shown and not labeled) is arranged on the second oil return branch, which includes but is not limited to a tubular one-way valve, and can prevent the hydraulic oil in the main oil return pipe 400 from flowing back to the second oil return branch to cause misoperation or oil leakage.

[0062] The mud-packing hydraulic circuit provided by the embodiment can be an automatic control circuit, and the mud-packing control directional valve 203 can be an electro-hydraulic directional valve. The mud-packing hydraulic circuit provided by the embodiment can also be a manual control circuit, and the mud-packing control directional valve 203 can be a manual directional valve.

[0063] In one of the embodiments, as Figure 3 The mud-packing hydraulic circuit is provided with a double one-way throttle valve 204, a first one-way throttle valve group of the double one-way throttle valve 204 is arranged on the first mud-packing hydraulic pipeline 208, and a second one-way throttle valve group of the double one-way throttle valve 204 is arranged on the second mud-packing hydraulic pipeline 209. Based on the design, the mud-packing speed and the retraction speed of the mud-packing hydraulic cylinder 200 can be reliably adjusted, and the working reliability of the mud-packing hydraulic cylinder 200 is improved. The double one-way throttle valve 204 has the advantage of high control precision.

[0064] In another embodiment, the mud-packing control directional valve 203 can be designed as an electro-hydraulic proportional valve, which can also achieve the purpose of adjusting the mud-packing speed and the retraction speed of the mud-packing hydraulic cylinder 200. At this time, the double one-way throttle valve 204 can be cancelled.

[0065] Further preferably, as Figure 3 The first mud-packing hydraulic pipeline 208 and the second mud-packing hydraulic pipeline 209 are each provided with a third hydraulic control one-way valve, the control oil port of the third hydraulic control one-way valve on the first mud-packing hydraulic pipeline 208 is connected to the second mud-packing hydraulic pipeline 209, and the control oil port of the third hydraulic control one-way valve on the second mud-packing hydraulic pipeline 209 is connected to the first mud-packing hydraulic pipeline 208. After the mud-packing, the mud-packing control directional valve 203 returns to the neutral position, and the A port and the B port (i.e., the two working oil ports) of the mud-packing control directional valve 203 are both connected to the main oil return pipe 400. At this time, the two third hydraulic control one-way valves are locked to the pipeline pressure, so that the mud-packing hydraulic cylinder 200 can be kept stationary, and the mud can be prevented from returning to the mud-packing chamber due to insufficient pressure of the mud-packing hydraulic cylinder 200 before the mud is hardened by the high temperature in the furnace. Alternatively, as Figure 3 The two third hydraulic control one-way valves can be combined into a double hydraulic control one-way valve 205, and the pressure locking effect is better.

[0066] The working process of the mud gun mud hydraulic control system is described as follows:

[0067] For example, the left side of the double one-way throttle valve 204 and the left side of the double hydraulic control one-way valve 205 are connected to the first mud hydraulic pipeline 208. When starting to spray mud, the electromagnet of the mud control reversing valve 203 is powered on, and the mud control reversing valve 203 is in the right valve position. The pressure oil enters the rodless cavity of the mud hydraulic cylinder 200 through the second pressure oil branch, the P port and the A port of the mud control reversing valve 203, the left side of the double hydraulic control one-way valve 205, and the left side of the double one-way throttle valve 204, pushes the piston rod to extend, and starts to spray mud. At this time, the hydraulic oil in the rod cavity of the mud hydraulic cylinder 200 passes through the right side of the double one-way throttle valve 204 (the bypass one-way valve of the second one-way throttle valve group is not open, and the return oil flows through the main valve core of the second one-way throttle valve group), the right side of the double hydraulic control one-way valve 205 (the control oil port on the right side is connected to the first mud hydraulic pipeline 208, so the right side one-way valve is open), the B port and the T port of the mud control reversing valve 203, and the second return oil branch to return to the main return oil pipe 400. By adjusting the opening of the right side main valve core of the double one-way throttle valve 204 (i.e. the opening of the main valve core of the second one-way throttle valve group), the return flow of the mud spraying can be adjusted, and the mud spraying speed can be adjusted.

[0068] When the mud gun retreats to the standby position and mud needs to be loaded, the mud hitting hydraulic cylinder 200 needs to be retracted, the electromagnet of the mud hitting control reversing valve 203 is powered, the mud hitting control reversing valve 203 is in the left valve position, the pressure oil enters the rod cavity of the mud hitting hydraulic cylinder 200 through the second pressure oil branch, the P port and the B port of the mud hitting control reversing valve 203, the right side of the double hydraulic control check valve 205, and the right side of the double check throttle valve 204, bypassing the check valve (i.e., the bypass check valve of the second check throttle valve group), and pushing the piston rod to retract; at this time, the hydraulic oil in the rodless cavity of the mud hitting hydraulic cylinder 200 returns to the main return oil pipe 400 through the left side of the double check throttle valve 204 (the bypass check valve of the first check throttle valve group is not open, and the return oil flows through the main valve core of the first check throttle valve group), the left side of the double hydraulic control check valve 205 (the control oil port on the left side is connected to the second mud hitting hydraulic pipeline 209, so the left side check valve is open), the A port and the T port of the mud hitting control reversing valve 203, and the second return oil branch. By adjusting the opening degree of the left side main valve core of the double check throttle valve 204 (i.e., the opening degree of the main valve core of the first check throttle valve group), the return oil flow of the mud hitting hydraulic cylinder 200 can be adjusted, and the retraction speed can be adjusted. After the mud hitting hydraulic cylinder 200 is retracted, the mud hitting control reversing valve 203 returns to the center position, the A port and the B port of the mud hitting control reversing 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 are locked to the pipeline pressure, the mud hitting hydraulic cylinder 200 remains stationary, and the mud loading can begin.

[0069] As Figure 1 and Figure 3 In one embodiment, the mud gun mud hitting hydraulic control system includes an automatic control mud hitting hydraulic circuit 201 and a manual control mud hitting hydraulic circuit 202, which are connected in parallel with the mud hitting hydraulic cylinder 200. The automatic control mud hitting hydraulic circuit 201 and the manual control mud hitting hydraulic circuit 202 can be used as backup for each other, improving the reliability and safety of the mud gun mud hitting operation.

[0070] In one embodiment, as Figure 3 A flow meter 206 is provided on the second mud hitting hydraulic pipeline 209 to monitor the hydraulic oil flow in the second mud hitting hydraulic pipeline 209 in real time, especially during the mud hitting process, to monitor the return oil flow of the mud hitting hydraulic cylinder 200 in real time, to calculate the stroke of the mud hitting hydraulic cylinder 200, and to obtain the mud hitting amount, thereby achieving real-time monitoring of the mud hitting amount during the mud hitting process, improving the reliability and safety of the mud gun mud hitting operation, avoiding excessive mud hitting to increase the difficulty of the next iron notch opening operation and cause waste of the mud gun, and avoiding insufficient mud hitting to cause the molten iron to overflow, etc. A maintenance bypass can be provided on the second mud hitting hydraulic pipeline 209 to facilitate maintenance of the flow meter 206.

[0071] In one embodiment, 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 taphole 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.

[0072] 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.

[0073] 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.

[0074] Example 3

[0075] 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.

[0076] 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.

[0077] 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;

[0078] 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.

[0079] Example 4

[0080] The utility model embodiment provides a kind of mud gun hydraulic control system, including mud gun hydraulic cylinder and hydraulic control circuit, the hydraulic control circuit includes the rodless cavity hydraulic line being connected with the rodless cavity of mud gun hydraulic cylinder and the rod cavity hydraulic line being connected with the rod cavity of mud gun hydraulic cylinder.

[0081] As Figures 1-3 Preferably, a pressure impact prevention module is provided between the rodless cavity hydraulic line and the rod cavity hydraulic line, the pressure impact prevention module includes a transition pipeline (not shown, not labeled), the transition pipeline includes two transition branch pipes (not shown, not labeled) and a bridge pipe (not shown, not labeled), the two transition branch pipes are connected to the rodless cavity hydraulic line and the rod cavity hydraulic line respectively through a transition main pipe in parallel, the bridge pipe is connected to the two transition branch pipes respectively and is provided with an impact relief valve 601 on the bridge pipe, two impact prevention check valves 602 are provided on each transition branch pipe and are arranged on the two sides of the bridge pipe connection point respectively, the two impact prevention check valves 602 on each transition branch pipe have opposite conduction directions, the two impact prevention check valves 602 arranged on each side of the bridge pipe have opposite conduction directions (i.e., the two impact prevention check valves 602 on the side of the transition branch pipe close to the rodless cavity hydraulic line have opposite conduction directions, and the two impact prevention check valves 602 on the side of the transition branch pipe close to the rod cavity hydraulic line have opposite conduction directions).

[0082] Wherein, the impact relief valve 601 can be a direct-acting overflow valve, and has an upper limit value of impact pressure; the impact prevention check valve 602 can be a cartridge check valve.

[0083] From the direction of the rodless cavity hydraulic pipeline to the rod cavity hydraulic pipeline, the two anti-impact check valves 602 on one of the transition branch pipes are defined as a first anti-impact check valve 602 and a second anti-impact check valve 602, and the two anti-impact check valves 602 on the other transition branch pipe are defined as a third anti-impact check valve 602 and a fourth anti-impact check valve 602. When the oil pressure impact occurs in the rodless cavity hydraulic pipeline, and the oil pressure instantaneously rises to the upper limit of the impact pressure set by the anti-impact overflow valve 601, the anti-impact overflow valve 601 is opened, and at this time, the high-pressure oil in the rodless cavity hydraulic pipeline enters the rod cavity hydraulic pipeline through the first anti-impact check valve 602, the anti-impact overflow valve 601 and the fourth anti-impact check valve 602, which reduces the oil pressure in the rodless cavity hydraulic pipeline to below the upper limit of the impact pressure on the one hand, and increases the oil pressure in the rod cavity hydraulic pipeline and the rod cavity of the mud gun hydraulic cylinder on the other hand, thereby offsetting the oil pressure in the rodless cavity of the mud gun hydraulic cylinder, greatly reducing the pressure impact, and protecting the mud gun hydraulic cylinder.

[0084] The mud gun has fast rotation speed, large amplitude, high hydraulic system pressure, and when the mud gun impacts the iron mouth or retreats to the standby position, a huge impact force is often generated, the oil pressure of the mud gun hydraulic cylinder instantaneously rises greatly, and the mud gun itself is a cantilever structure. Such pressure impact will bring certain adverse effects to the hydraulic system of the mud gun hydraulic cylinder, the mechanical structure of the mud gun itself and the base, etc. In the embodiment, the pressure impact prevention module is arranged, so that the pressure impact can be well relieved, and the action stability, safety and service life of the mud gun are improved.

[0085] In the embodiment, the mud gun hydraulic control system can be applied to the first embodiment to the third embodiment.

[0086] Embodiment five

[0087] The utility model embodiment provides a kind of mud gun hydraulic control system, including main pressure oil pipe 300, main oil return pipe 400 and hydraulic control circuit, hydraulic control circuit is equipped with main control reversing valve, the pressure port of this main control reversing valve is connected with main pressure oil pipe 300 by pressure oil branch pipe, and the oil return port of this main control reversing valve is connected with main oil return pipe 400 by oil return branch pipe.

[0088] In one of the embodiments, asFigures 1-3 The mud gun hydraulic control system further comprises a safety locking module, the safety locking module comprises a safety control reversing valve 302 and a safety control check valve 301, the safety control check valve 301 is arranged on the main pressure oil pipe 300, a control oil port of the safety control check valve 301 is connected with one working oil port of the safety control reversing valve 302, a pressure port of the safety control reversing valve 302 is connected with the main pressure oil pipe 300, and a back oil port of the safety control reversing valve 302 is connected with the main back oil pipe 400.

[0089] Preferably, the safety control reversing valve 302 is an electromagnetic reversing valve, and more preferably, the safety control reversing valve 302 is a two-position four-way reversing valve. Preferably, the safety control check valve 301 is a cartridge check valve.

[0090] In normal operation, the electromagnet of the safety control reversing valve 302 is de-energized, the safety control reversing valve 302 is in the right valve position, the control oil port X of the safety control check valve 301 is connected with the main back oil pipe 400, the main valve core of the safety control check valve 301 is opened, the pressure oil of the main pressure oil pipe 300 can enter the hydraulic control circuit, and the related actions of the mud gun are completed. When the mud gun does not need to act or the mud gun and the furnace front area are under maintenance, the electromagnet of the safety control reversing valve 302 is energized, the safety control reversing valve 302 is in the left valve position, the control oil port X of the safety control check valve 301 is connected with the main pressure oil pipe 300, the main valve core of the safety control check valve 301 is closed, the pressure oil of the main pressure oil pipe 300 cannot enter the hydraulic control circuit, and the mud gun cannot act, thereby ensuring safety.

[0091] In one embodiment, as shown in FIG. 1, Figures 1-3 A high-pressure filter 303 is arranged on the main pressure oil pipe 300, so that the pressure oil entering the hydraulic control circuit is clean, the working reliability of the mud gun is improved, and the service life of each component in the mud gun hydraulic control system is improved.

[0092] Preferably, the mud gun hydraulic control system can be applied to the above-mentioned embodiments one to four.

[0093] The above merely provides the preferred embodiments of the utility model, and is not intended to limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A mud gun hydraulic control system for preventing pressure shock, comprising a mud gun hydraulic cylinder and a hydraulic control circuit, wherein 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, characterized in that: The hydraulic control circuit is equipped with an anti-pressure shock module, which includes a transition pipe. The transition pipe includes two transition branch pipes and a bridge pipe. 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 are equipped with anti-pressure relief valves. Each transition branch pipe is equipped with two anti-pressure check valves, which are located on both sides of the bridge pipe connection point. The two anti-pressure check valves on each transition branch pipe have opposite conduction directions, and the two anti-pressure check valves on each side of the bridge pipe, which are located on the two transition branch pipes, have opposite conduction directions.

2. The mud gun hydraulic control system as described in claim 1, characterized in that: The anti-impact overflow valve is a direct-acting overflow valve.

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

4. The mud gun hydraulic control system as described in claim 1, characterized in that: The mud gun hydraulic cylinder has two units, namely a rotary hydraulic cylinder and a mud-pumping hydraulic cylinder. The hydraulic control circuit is divided into two sets, including a rotary hydraulic circuit connected to the rotary hydraulic cylinder and a mud-pumping hydraulic circuit connected to the mud-pumping hydraulic cylinder. The rotary hydraulic circuit and / or the mud-pumping hydraulic circuit are equipped with the anti-pressure shock module.

5. The mud gun hydraulic control system as described in claim 4, characterized in that: The rotary hydraulic circuit includes an automatic control rotary hydraulic circuit and a manual control rotary hydraulic circuit, which are connected in parallel and connected to the rotary hydraulic cylinder; the automatic control rotary hydraulic circuit and / or the manual control rotary hydraulic circuit are equipped with the anti-pressure shock module.

6. The mud gun hydraulic control system as described in claim 4, characterized in that: The mud-beating hydraulic circuit includes an automatic control mud-beating hydraulic circuit and a manual control mud-beating hydraulic circuit, which are connected in parallel and connected to the mud-beating hydraulic cylinder; the automatic control mud-beating hydraulic circuit and / or the manual control mud-beating hydraulic circuit are equipped with the anti-pressure shock module.

7. The mud gun hydraulic control system as described in claim 1, characterized in that: The hydraulic control circuit also includes a main control directional valve. The pressure port of the main control directional valve is connected to the main pressure oil pipe through a pressure oil branch pipe, and the return port of the main control directional valve is connected to the main return oil pipe through a return oil branch pipe. The rodless chamber hydraulic line and the rod chamber hydraulic line are respectively connected to the two working oil ports of the main control directional valve.

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

9. The mud gun hydraulic control system as described in claim 1, characterized in that: The mud gun hydraulic cylinder is a mud-pumping hydraulic cylinder, the hydraulic control circuit is a mud-pumping hydraulic circuit, and the mud-pumping hydraulic circuit is equipped with a double one-way throttle valve. The first one-way throttle valve group of the double one-way throttle valve is set on the rodless chamber hydraulic pipeline, and the second one-way throttle valve group of the double one-way throttle valve is set on the rod chamber hydraulic pipeline.

10. The mud gun hydraulic control system as described in claim 1, characterized in that: The mud gun hydraulic cylinder is a mud-pumping hydraulic cylinder, the hydraulic control circuit is a mud-pumping hydraulic circuit, and a flow meter is installed on the hydraulic pipeline of the rod chamber.

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