Bidirectional high-pressure sealing knife gate valve

Abstract

The invention discloses a bidirectional high-pressure sealing knife gate valve, and relates to the field of gate valves, the bidirectional high-pressure sealing knife gate valve comprises a knife gate valve seat, a gate plate is arranged in the knife gate valve seat, a support is installed on the knife gate valve seat, a lead screw is movably installed on the support, the lead screw is connected to the gate plate, and a hand wheel is installed on the lead screw. It needs to be explained that in the embodiment of the invention, the knife gate valve is sealed through the outer sealing box, meanwhile, the temperature of the knife gate valve can be kept, and the knife gate valve is prevented from being damaged; in addition, when the knife gate valve seat and the pipeline are connected and generate displacement, the pipeline is buffered through resilience force of a buffer spring, the stability of pipeline connection is guaranteed, if the displacement distance is large, a switching rod pushes an active supporting frame to move upwards through a switching shaft, then the active supporting frame actively supports the pipeline, and the safety of pipeline connection is guaranteed. The stability of connection between the pipeline and the knife gate valve seat is guaranteed, meanwhile, larger pressure brought by media can be borne, and leakage caused by too large displacement is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of gate valves, and in particular to a bidirectional high-pressure sealing knife gate valve. Background Art

[0002] Knife gate valve is also called knife-type gate valve, knife gate valve, slurry valve, mud valve. Its opening and closing parts are gates. The movement direction of the gate is perpendicular to the direction of the fluid. The medium is cut off by the blade-shaped gate that can cut fiber materials. If a higher medium sealing is required, an O-shaped sealing valve seat can be selected to achieve bidirectional high-pressure sealing. The bottom of the gate of the knife gate valve is opened with a knife-shaped bevel cut. This design makes the gate have a shearing function, which can scrape off the adhesive and debris on the sealing surface when the valve is closed, thereby realizing the automatic cleaning function. The advantages of the knife gate valve are: automatic slag discharge function: through the knife-shaped bevel cut at the bottom of the gate, it can automatically remove impurities in the medium when closing to prevent blockage and leakage; anti-corrosion: the gate made of stainless steel can effectively prevent sealing leakage caused by corrosion; wide range of application: suitable for various high-concentration suspended particle media, such as ore slurry, coal slurry, paper pulp, etc.

[0003] It should be noted that when the knife gate valve is in use, the handwheel is turned to make the screw drive the gate plate to move up and down to achieve the on and off of the medium in the pipeline. However, when the knife gate valve is installed outdoors for long-term use, especially when conveying media such as petroleum, due to the long-term exposure to harsh outdoor environments, the knife gate valve is exposed to complex environments such as strong winds and sand or high water vapor for a long time, which can easily cause the knife gate valve to be corroded and damaged, or lose its lubrication effect, making the knife gate valve unusable or even causing leakage. In addition, when the knife gate valve is large in size, it is very easy to produce problems such as water hammer effect when using the knife gate valve, or because of the vibration generated by the movement of large vehicles, or other similar problems, causing the connection between the pipeline and the knife gate valve to be vibrated. If the vibration time is long or the vibration amplitude is large, it may even cause leakage of the pipeline and the knife gate valve. Summary of the invention

[0004] The object of the present invention is to provide a bidirectional high-pressure sealing knife gate valve to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A bidirectional high-pressure sealing knife gate valve, comprising a knife gate valve seat, a gate plate arranged in the knife gate valve seat, and a bracket installed on the knife gate valve seat, a screw rod movably installed on the bracket, and the screw rod is connected to the gate plate; a hand wheel is installed on the screw rod, and the hand wheel is rotated to drive the screw rod to move so as to drive the gate plate to move, and pipelines are connected to both sides of the knife gate valve seat; A connecting frame is installed on the knife gate valve seat, and a temperature control protection device is sleeved on the connecting frame. The knife gate valve seat is located in the temperature control protection device, and the temperature control protection device is used to close the knife gate valve seat and maintain the ambient temperature of the knife gate valve seat; the temperature control protection device includes two outer closing boxes, and the two outer closing boxes are respectively slidably installed on both sides of the connecting frame. The two outer closing boxes are closed to close the knife gate valve seat, and connecting frames are installed on both sides of the connecting frame. Heat rods are installed on the two connecting frames, and the top of the heat rod extends into the outer closing box, and the bottom of the heat rod is inserted into the ground. A plurality of heat dissipation fins are installed on the heat rod for heat dissipation, and the plurality of heat dissipation fins are located in the outer closing box; It also includes an active supporting device, which is installed on the bottom side of the connecting frame and is used to actively lift and support the pipeline; the active supporting device includes a supporting base, and two extrusion frames and an active supporting frame are vertically slidably installed inside the supporting base, the two extrusion frames are in contact with the two pipelines, and the active supporting frame is used to lift and support the pipeline.

[0006] Furthermore, in a preferred embodiment of the present invention, the temperature control protection device further comprises two push rods, and the two push rods are rotatably mounted on the two outer closed boxes respectively; A driving shaft is rotatably mounted on the two driving rods, and the driving shaft is movably mounted on the connecting frame. An opening shaft is rotatably mounted on both driving rods, and the two opening shafts are respectively mounted on the two outer closed boxes.

[0007] Furthermore, in a preferred embodiment of the present invention, a slide groove is provided on one side of the connection frame, a sliding block is slidably installed in the slide groove, the driving shaft is rotatably installed on the sliding block, and a push handle is installed at one end of the driving shaft; Sealing pads are provided on both sides of the connection frame, and the two outer closed boxes are in close contact with the two sealing pads respectively. A connecting sleeve is connected to the outer closed box, and the connecting sleeve is sleeved on the pipeline to seal the connection between the outer closed box and the pipeline.

[0008] Furthermore, in a preferred embodiment of the present invention, guide rods are installed at the four corners of both sides of the connection frame, and the outer closed box is movably installed on the four guide rods located on the same side; A pull-back spring is installed at the end of the guide rod, and the other end of the pull-back spring is installed on the outer closed box.

[0009] Furthermore, in a preferred embodiment of the present invention, two transfer rods are rotatably mounted on both sides of the support base, and the two transfer rods located on the same side are movably mounted on both sides of the active support frame respectively; Push-pull grooves are provided on both sides of the active support frame, and transfer shafts are rotatably mounted on the two transfer rods, and ends of the two transfer shafts close to each other are movably mounted in the two push-pull grooves respectively.

[0010] Further, in a preferred embodiment of the present invention, two pushing gear rods are installed on the bottom side of the extrusion frame, and the two pushing gear rods are respectively located on both sides of the supporting base, and the two transfer rods located on the same side are both installed with driving gears on the sides away from each other, and the two driving gears are meshed with the two pushing gear rods; A support shaft is installed inside the transfer rod and the driving gear, and the support shaft is rotatably installed on one side of the support base.

[0011] Furthermore, in a preferred embodiment of the present invention, a buffer groove is provided on the bottom side of the pushing gear rod, a buffer rod is movably installed in the buffer groove, and the bottom end of the buffer rod is installed in the supporting base; A buffer spring is installed at the top end of the buffer rod, and the top end of the buffer spring is installed on the top inner wall of the buffer groove.

[0012] Furthermore, in a preferred embodiment of the present invention, an automatic sealing lubrication device is further included, wherein the automatic sealing lubrication device is installed in one of the outer sealing boxes, and the automatic sealing lubrication device is used to seal and lubricate the screw rod; The automatic closed lubrication device comprises two closed covers, the two closed covers are in contact with each other, the screw rod is closed in the two closed covers, oil pipes are installed on the two closed covers, an oil storage tank is movably sleeved on the oil pipes, the oil storage tank is installed on the inner wall of the outer closed box, and push-pull seats are installed on the two oil pipes on the same side; Two wedge-shaped push racks are installed on one side of the outer closed box, and the two wedge-shaped push racks are respectively inserted into the two push-pull seats.

[0013] Furthermore, in a preferred embodiment of the present invention, a return spring is installed on one side of the push-pull seat, and the other end of the return spring is installed on the oil storage tank; A closing seat is installed on the inner wall of the oil storage tank, and the oil pipeline is movably inserted into the closing seat to close the oil pipeline.

[0014] Furthermore, in a preferred embodiment of the present invention, a sealing sleeve is sleeved on the oil delivery pipe, the sealing sleeve is in contact with the inner wall of the oil storage tank, and the sealing sleeve is used to seal the connection between the oil storage tank and the oil delivery pipe; The oil delivery pipe is communicated with the closed cover, and the closed cover is hollow. A plurality of oil outlet holes are opened on one side of the closed cover, and the lubricating oil flows out through the oil outlet holes. A sponge is arranged inside the closed cover.

[0015] The beneficial effects of a bidirectional high-pressure sealing knife gate valve proposed by the present invention are: In the present invention, by setting a temperature control protection device, when the knife gate valve is not in use, the knife gate valve is closed by an external sealing box to prevent the knife gate valve from being continuously corroded by external water vapor or dust and causing damage to the knife gate valve. At the same time, a heat rod is inserted into the ground to transport the underground heat to the external sealing box and dissipate it through a plurality of heat dissipation fins. The temperature of the knife gate valve can be maintained in cold seasons to prevent the knife gate valve from being damaged due to low temperature.

[0016] Furthermore, in the present invention, through the provision of an active support device, when the knife gate valve seat is connected to the pipeline, due to problems such as the water hammer effect, the connection causes vibration and thus displacement, the pipeline is buffered by the rebound force of the buffer spring to ensure the stability of the pipeline connection. If the displacement distance is large, the adapter rod pushes the active support frame upward through the adapter shaft, so that the active support frame actively supports the pipeline, ensuring the stability of the connection between the pipeline and the knife gate valve seat, and at the same time can also withstand the greater pressure brought by the medium, avoiding the problem of leakage caused by excessive displacement.

[0017] Furthermore, in the present invention, through the setting of the automatic closed lubrication device, when the outer closed box is closed, the wedge-shaped push frame is driven to move synchronously, and then the push-pull seat is driven to move, and the push-pull seat drives the two oil pipes to move synchronously. At this time, the oil pipe drives the closed cover to close the screw rod, so as to avoid the problem of lubricating oil failure caused by long-term exposure of the screw rod. At the same time, when the closed cover closes the screw rod, the oil pipe is separated from the closed seat and drives the return spring to be stretched, so that the lubricating oil in the oil storage tank enters the closed cover through the oil pipe, and then flows to the screw rod through multiple oil outlet holes, thereby achieving the purpose of automatic lubrication. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure of a two-way high-pressure sealing knife gate valve provided by an embodiment of the present invention connected with a pipeline and other structures; Figure 2 A schematic structural diagram of a bidirectional high-pressure sealing knife gate valve provided in an embodiment of the present invention; Figure 3 A schematic structural diagram of the connection between an outer sealing box and a sealing cover and other structures of a bidirectional high-pressure sealing knife gate valve provided by an embodiment of the present invention; Figure 4 A bidirectional high pressure sealing knife gate valve provided by an embodiment of the present invention Figure 1Schematic diagram of the structure of part A; Figure 5 A schematic structural diagram of a bidirectional high-pressure sealing knife gate valve provided by an embodiment of the present invention, wherein a connecting frame is connected to a heat rod and other structures; Figure 6 A schematic cross-sectional view of the connection between a connecting frame and an outer closing box and other structures of a bidirectional high-pressure sealing knife gate valve provided by an embodiment of the present invention; Figure 7 A schematic diagram of the structure of the connection between an extrusion frame and a push gear rod and other structures of a bidirectional high-pressure sealing knife gate valve provided by an embodiment of the present invention; Figure 8 A schematic diagram of a partial structure of a connection between an active support frame and a transfer rod and other structures of a bidirectional high-pressure sealing knife gate valve provided by an embodiment of the present invention; Fig. 9 A schematic diagram of a partial cross-sectional structure of a connection between a push gear rod and a buffer rod and other structures of a bidirectional high-pressure sealing knife gate valve provided by an embodiment of the present invention; Fig.10 A schematic diagram of the structure of the connection between a push-pull seat and a push gear rod and other structures of a bidirectional high-pressure sealing knife gate valve provided by an embodiment of the present invention; Fig.11 A schematic cross-sectional view of the connection between a sealing cover and an oil storage tank and other structures of a bidirectional high-pressure sealing knife gate valve provided by an embodiment of the present invention; Fig.12 A partial cross-sectional structural schematic diagram of the connection between an oil storage tank and an oil pipeline and other structures of a bidirectional high-pressure sealed knife gate valve provided in an embodiment of the present invention.

[0019] In the figure: 1-knife gate valve seat; 2-screw rod; 3-gate plate; 4-hand wheel; 5-pipeline; 6-connection frame; 7-temperature control protection device; 701-outer closing box; 702-connection sleeve; 703-push rod; 704-opening shaft; 705-push shaft; 706-sliding block; 707-slideway; 708-push handle; 709-heat rod; 710-heat dissipation fin; 711-guide rod; 712-connection frame; 713-return spring; 8-active support device; 801-support base; 802-extrusion frame ;803-push gear rod;804-active support frame;805-support shaft;806-adapter rod;807-adapter shaft;808-drive gear;809-buffer rod;810-buffer groove;811-buffer spring;812-push-pull groove;9-automatic closed lubrication device;901-closed cover;902-oil outlet;903-oil storage tank;904-oil pipeline;905-closed seat;906-sealing sleeve;907-push-pull seat;908-wedge-shaped push frame;909-reset spring;10-bracket. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0023] In addition, in the description of the present invention, it should be noted that the terms "center", "upper", "lower", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the invented product is usually placed when in use, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0024] In addition, the terms "horizontal", "vertical", "perpendicular" and the like do not mean that the components are required to be absolutely vertical, but can be slightly tilted. For example, "vertical" only means that its direction is more vertical than "horizontal", and does not mean that the structure must be completely vertical, but can be slightly tilted.

[0025] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Please refer to the attached manual Figure 1-12A bidirectional high-pressure sealing knife gate valve provided in an embodiment of the present invention comprises a knife gate valve seat 1, a gate plate 3 is arranged in the knife gate valve seat 1, and a bracket 10 is installed on the knife gate valve seat 1, a screw rod 2 is movably installed on the bracket 10, the screw rod 2 is connected to the gate plate 3, and a hand wheel 4 is installed on the screw rod 2, and the hand wheel 4 is rotated to drive the screw rod 2 to move so as to drive the gate plate 3 to move, and pipelines 5 are connected to both sides of the knife gate valve seat 1.

[0027] Please refer to the instruction manual Figure 3-6 Furthermore, an embodiment of the present invention provides a bidirectional high-pressure sealed knife gate valve, wherein a connecting frame 6 is installed on the knife gate valve seat 1, a temperature control protection device 7 is sleeved on the connecting frame 6, the knife gate valve seat 1 is located in the temperature control protection device 7, and the temperature control protection device 7 is used to close the knife gate valve seat 1 and maintain the ambient temperature of the knife gate valve seat 1; specifically, the temperature control protection device 7 includes two outer sealing boxes 701, the two outer sealing boxes 701 are respectively slidably installed on both sides of the connecting frame 6, the two outer sealing boxes 701 are closed to close the knife gate valve seat 1, connecting frames 712 are installed on both sides of the connecting frame 6, and heat rods 709 are installed on the two connecting frames 712, the top of the heat rod 709 extends into the outer sealing box 701, the bottom end of the heat rod 709 is inserted into the ground, and a plurality of heat dissipation fins 710 are installed on the heat rod 709 for heat dissipation, and the plurality of heat dissipation fins 710 are located in the outer sealing box 701. It should be noted that, in the embodiment of the present invention, the outer sealing box 701 seals the knife gate valve as a whole to prevent external water vapor or dust from continuously corroding the knife gate valve and causing damage to the knife gate valve. At the same time, the heat rod 709 is inserted into the ground to transport the underground heat to the outer sealing box 701 and dissipate it through multiple heat dissipation fins 710. In cold seasons, the temperature of the knife gate valve can be maintained to prevent the knife gate valve from being damaged due to low temperature, thereby ensuring the normal use of the knife gate valve and further ensuring that the pipeline can smoothly transport or block the medium.

[0028] For more details, please refer to the attached manual. Figure 7-9 In the embodiment of the present invention, an active support device 8 is also included. The active support device 8 is installed on the bottom side of the connection frame 6. The active support device 8 is used to actively lift and support the pipeline 5. The active support device 8 includes a support base 801. Two extrusion frames 802 and an active support frame 804 are vertically slidably installed inside the support base 801. The two extrusion frames 802 are in contact with the two pipelines 5. The active support frame 804 is used to lift and support the pipeline 5. It should be noted that in the embodiment of the present invention, when the knife gate valve seat 1 is connected to the pipeline 5, due to problems such as the water hammer effect, the active support frame 804 is moved up, so that the active support frame 804 actively supports the pipeline 5, thereby ensuring the stability of the connection between the pipeline 5 and the knife gate valve seat 1 and avoiding leakage caused by excessive displacement.

[0029] For further information, please refer to the attached manual. Figure 3-6 In the embodiment of the present invention, a bidirectional high-pressure sealing knife gate valve is provided, and the temperature control protection device 7 also includes two push rods 703, and the two push rods 703 are rotatably mounted on the two outer closed boxes 701 respectively; in addition, the two push rods 703 are rotatably mounted with a push shaft 705, and the push shaft 705 is movably mounted on the connecting frame 6, and the two push rods 703 are rotatably mounted with a spread shaft 704, and the two spread shafts 704 are respectively mounted on the two outer closed boxes 701. It should be noted that in the embodiment of the present invention, pushing the push handle 708 can drive the two push rods 703 to rotate and unfold through the push shaft 705, and the two push rods 703 spread the two outer closed boxes 701 through the two spread shafts 704, so as to achieve the purpose of synchronously opening the two outer closed boxes 701.

[0030] More specifically, in the embodiment of the present invention, a slide groove 707 is provided on one side of the connecting frame 6, a sliding block 706 is slidably installed in the slide groove 707, a driving shaft 705 is rotatably installed on the sliding block 706, and a push handle 708 is installed at one end of the driving shaft 705; In addition, both sides of the connection frame 6 are provided with sealing gaskets for sealing, and the two outer closed boxes 701 are in close contact with the two sealing gaskets respectively. The outer closed box 701 is connected with a connecting sleeve 702, and the connecting sleeve 702 is sleeved on the pipe 5 to seal the connection between the outer closed box 701 and the pipe 5. It should be noted that in the embodiment of the present invention, when the push handle 708 is pushed to drive the push shaft 705 to move, the push shaft 705 moves vertically in the slide groove 707 through the sliding block 706.

[0031] Please continue to refer to the instruction manual Figure 3-6 Specifically, in the embodiment of the present invention, guide rods 711 are installed at the four corners of both sides of the connection frame 6, and the outer closed box 701 is movably installed on the four guide rods 711 located on the same side; a return spring 713 is installed at the end of the guide rod 711, and the other end of the return spring 713 is installed on the outer closed box 701. It should be noted that in the embodiment of the present invention, when the outer closed box 701 moves, it slides horizontally on the four guide rods 711 and drives the four return springs 713 to be stressed. When the push handle 708 is released, the return force of the four return springs 713 can help the outer closed box 701 to reset.

[0032] For further information, please refer to the attached manual. Figure 7-9In a bidirectional high-pressure sealing knife gate valve provided by an embodiment of the present invention, two transfer rods 806 are rotatably installed on both sides of a support base 801, and the two transfer rods 806 on the same side are movably installed on both sides of an active support frame 804; in addition, push-pull grooves 812 are provided on both sides of the active support frame 804, and transfer shafts 807 are rotatably installed on the two transfer rods 806, and the ends of the two transfer shafts 807 close to each other are movably installed in the two push-pull grooves 812. It should be noted that in the embodiment of the present invention, when the transfer rod 806 rotates, the active support frame 804 is pushed upward through the transfer shaft 807, and the transfer shaft 807 slides in the push-pull groove 812, so that the transfer rod 806 rotates and pushes the active support frame 804 upward through the transfer shaft 807, thereby completing the action of actively supporting the pipeline 5.

[0033] More specifically, in the embodiment of the present invention, two push gear rods 803 are installed on the bottom side of the extrusion frame 802, and the two push gear rods 803 are respectively located on both sides of the support base 801, and the two transfer rods 806 located on the same side are both installed with driving gears 808 on the sides away from each other, and the two driving gears 808 are meshed with the two push gear rods 803; In addition, a support shaft 805 is installed in the transfer rod 806 and the driving gear 808, and the support shaft 805 is rotatably installed on one side of the support base 801. It should be noted that in the embodiment of the present invention, if the displacement distance of the pipeline 5 is large, the driving gear 808 is driven to rotate by the pushing gear rod 803, so that the driving gear 808 drives the transfer rod 806 to rotate. At this time, the transfer rod 806 pushes the active support frame 804 to move up through the transfer shaft 807, so that the active support frame 804 actively supports the pipeline 5, and then pushes the pipeline to reset, ensuring the stability of the connection between the pipeline 5 and the knife gate valve seat 1.

[0034] Please continue to refer to the instruction manual Figure 7-9 , further specifically, in the embodiment of the present invention, a buffer groove 810 is provided at the bottom side of the push gear rod 803, a buffer rod 809 is movably installed in the buffer groove 810, and the bottom end of the buffer rod 809 is installed in the support base 801; a buffer spring 811 is installed at the top end of the buffer rod 809, and the top end of the buffer spring 811 is installed on the top inner wall of the buffer groove 810. It should be noted that in the embodiment of the present invention, when the pipeline 5 vibrates slightly and causes displacement, it will drive the extrusion frame 802 on the corresponding side to move downward, and the extrusion frame 802 moves downward to drive the two push gear rods 803 to move, and the push gear rod 803 slides on the buffer rod 809 through the buffer groove 810, and drives the buffer spring 811 to be stressed, and the push gear rod 803 is buffered by the rebound force of the buffer spring 811, so that the extrusion frame 802 buffers the pipeline 5, and the connection of the pipeline 5 is reset, ensuring the sealing of the connection between the pipeline 5 and the knife gate valve.

[0035] For further information, please refer to the attached manual. Figure 10-12 , a bidirectional high-pressure sealing knife gate valve provided by an embodiment of the present invention also includes an automatic sealing lubricating device 9, which is installed in an outer sealing box 701, and is used to seal and lubricate the screw rod 2; the automatic sealing lubricating device 9 includes two sealing covers 901, the two sealing covers 901 are in contact, and the screw rod 2 is sealed in the two sealing covers 901, and oil pipelines 904 are installed on the two sealing covers 901, and an oil storage tank 903 is movably sleeved on the oil pipeline 904, and the oil storage tank 903 is installed on the inner wall of the outer sealing box 701, and push-pull seats 907 are installed on the two oil pipelines 904 on the same side; In addition, two wedge-shaped push racks 908 are installed on one side of the outer closed box 701, and the two wedge-shaped push racks 908 are respectively inserted into the two push-pull seats 907. It should be noted that in the embodiment of the present invention, when the outer closed box 701 is closed or opened, the push-pull seats 907 are driven to move by the wedge-shaped push racks 908 to achieve automatic lubrication and closing of the lubricating oil.

[0036] More specifically, in the embodiment of the present invention, a return spring 909 is installed on one side of the push-pull seat 907, and the other end of the return spring 909 is installed on the oil storage tank 903; a closing seat 905 is installed on the inner wall of the oil storage tank 903, and the oil pipeline 904 is moved and inserted on the closing seat 905 to close the oil pipeline 904. It should be noted that in the embodiment of the present invention, when the outer closing box 701 is opened, the oil pipeline 904 is inserted on the closing seat 905, so that the closing seat 905 closes the oil pipeline 904, achieving the purpose of automatically stopping lubrication.

[0037] Please continue to refer to the instruction manual Figure 10-12 , more specifically, in the embodiment of the present invention, a sealing sleeve 906 is sleeved on the oil delivery pipe 904, and the sealing sleeve 906 is in contact with the inner wall of the oil storage tank 903, and the sealing sleeve 906 is used to seal the connection between the oil storage tank 903 and the oil delivery pipe 904; In addition, the oil delivery pipe 904 is connected with the closed cover 901, and the closed cover 901 is hollow, and a plurality of oil outlet holes 902 are provided on one side of the closed cover 901, and the lubricating oil flows out through the oil outlet holes 902, and a sponge is provided in the closed cover 901. It should be noted that in the embodiment of the present invention, when the outer closed box 701 is closed, the wedge-shaped push frame 908 is driven to move synchronously, and then the push-pull seat 907 is driven to move, and the push-pull seat 907 drives the two oil delivery pipes 904 to move synchronously. At this time, the oil delivery pipe 904 drives the closed cover 901 to close the screw rod 2, and at the same time, the oil delivery pipe 904 is separated from the closed seat 905, so that the lubricating oil in the oil storage tank 903 enters the closed cover 901 through the oil delivery pipe 904, and then flows to the screw rod 2 through the plurality of oil outlet holes 902, so as to achieve the purpose of automatic lubrication.

[0038] In summary, the working principle of a bidirectional high-pressure sealing knife gate valve provided by an embodiment of the present invention is: When the hand wheel 4 is needed to operate the knife gate valve, the push handle 708 is pushed to drive the push shaft 705 to move, and the push shaft 705 moves vertically in the slide groove 707 through the sliding block 706, and the push shaft 705 moves to drive the push rod 703 to move, and the push rod 703 drives the outer sealing box 701 to slide and open through the expansion shaft 704, and the outer sealing box 701 moves horizontally on the four guide rods 711, and drives the multiple pull-back springs 713 to be stressed, so that the outer sealing box 701 can be opened synchronously; similarly, when the push handle 708 is released, the outer sealing box 701 can be reset under the pull-back force of the multiple pull-back springs 713 to close the knife gate valve, thereby preventing the external water vapor or dust from continuously eroding the knife gate valve and causing the knife gate valve to be damaged. At the same time, the heat rod 709 is inserted into the ground to transport the underground heat to the outer sealing box 701 and dissipate it through the multiple heat dissipation fins 710, so that the temperature of the knife gate valve can be maintained in cold seasons to avoid the problem of the knife gate valve being damaged due to low temperature; Furthermore, when the knife gate valve seat 1 is connected to the pipeline 5, due to problems such as the water hammer effect, the connection thereof causes vibration and displacement. When the pipeline 5 on any side is slightly displaced, the extrusion frame 802 on the corresponding side will be driven to move downward. The downward movement of the extrusion frame 802 drives the two pushing gear rods 803 to move, and the pushing gear rod 803 slides on the buffer rod 809 through the buffer groove 810, and drives the buffer spring 811 to be stressed. The pushing gear rod 803 is buffered by the rebound force of the buffer spring 811, so that the extrusion frame 802 buffers the pipeline 5. If the displacement distance is large, the pushing gear rod 803 drives the driving gear 808 to rotate, and then the driving gear 808 drives the transfer rod 806 to rotate. At this time, the transfer rod 806 pushes the active support frame 804 upward through the transfer shaft 807, so that the active support frame 804 actively supports the pipeline 5, thereby ensuring the stability of the connection between the pipeline 5 and the knife gate valve seat 1 and avoiding the problem of leakage caused by excessive displacement. Furthermore, when the outer closing box 701 is closed, the wedge-shaped push frame 908 is driven to move synchronously, and then the push-pull seat 907 is driven to move. The push-pull seat 907 drives the two oil pipes 904 to move synchronously. At this time, the oil pipe 904 drives the closing cover 901 to close the screw rod 2, so as to avoid the problem of lubricating oil failure caused by long-term exposure of the screw rod 2. At the same time, when the closing cover 901 closes the screw rod 2, the oil pipe 904 is separated from the closing seat 905, and drives the return spring 909 to be stretched, so that the lubricating oil in the oil storage tank 903 enters the closing cover 901 through the oil pipe 904, and then flows to the screw rod 2 through multiple oil outlet holes 902, thereby achieving the purpose of automatic lubrication.

[0039] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A bidirectional high pressure sealed knife gate valve, characterized in that: It comprises a knife gate valve seat, a gate plate is arranged in the knife gate valve seat, and a bracket is installed on the knife gate valve seat, a screw rod is movably installed on the bracket, and the screw rod is connected to the gate plate; a hand wheel is installed on the screw rod, and the hand wheel is rotated to drive the screw rod to move so as to drive the gate plate to move, and both sides of the knife gate valve seat are connected with pipelines; A connecting frame is installed on the knife gate valve seat, and a temperature control protection device is sleeved on the connecting frame. The knife gate valve seat is located in the temperature control protection device, and the temperature control protection device is used to close the knife gate valve seat and maintain the ambient temperature of the knife gate valve seat; the temperature control protection device includes two outer closing boxes, and the two outer closing boxes are respectively slidably installed on both sides of the connecting frame. The two outer closing boxes are closed to close the knife gate valve seat, and connecting frames are installed on both sides of the connecting frame. Heat rods are installed on the two connecting frames, and the top of the heat rod extends into the outer closing box, and the bottom of the heat rod is inserted into the ground. A plurality of heat dissipation fins are installed on the heat rod for heat dissipation, and the plurality of heat dissipation fins are located in the outer closing box; It also includes an active supporting device, which is installed on the bottom side of the connecting frame and is used to actively lift and support the pipeline; the active supporting device includes a supporting base, and two extrusion frames and an active supporting frame are vertically slidably installed inside the supporting base, the two extrusion frames are in contact with the two pipelines, and the active supporting frame is used to lift and support the pipeline.

2. A bidirectional high-pressure sealing knife gate valve according to claim 1, characterized in that: The temperature control protection device also includes two push rods, which are rotatably mounted on the two outer closed boxes respectively; A driving shaft is rotatably mounted on the two driving rods, and the driving shaft is movably mounted on the connecting frame. An opening shaft is rotatably mounted on both driving rods, and the two opening shafts are respectively mounted on the two outer closed boxes.

3. A bidirectional high-pressure sealing knife gate valve according to claim 2, characterized in that: A slide groove is provided on one side of the connection frame, a slide block is slidably installed in the slide groove, the driving shaft is rotatably installed on the slide block, and a push handle is installed at one end of the driving shaft; Sealing pads are provided on both sides of the connection frame, and the two outer closed boxes are in close contact with the two sealing pads respectively. A connecting sleeve is connected to the outer closed box, and the connecting sleeve is sleeved on the pipeline to seal the connection between the outer closed box and the pipeline.

4. A bidirectional high-pressure sealing knife gate valve according to claim 3, characterized in that: Guide rods are installed at the four corners of both sides of the connection frame, and the outer closed box is movably installed on the four guide rods located on the same side; A pull-back spring is installed at the end of the guide rod, and the other end of the pull-back spring is installed on the outer closed box.

5. A bidirectional high pressure sealing knife gate valve according to claim 1, characterized in that: Two transfer rods are rotatably mounted on both sides of the support base, and the two transfer rods on the same side are movably mounted on both sides of the active support frame respectively; Push-pull grooves are provided on both sides of the active support frame, and transfer shafts are rotatably mounted on the two transfer rods, and ends of the two transfer shafts close to each other are movably mounted in the two push-pull grooves respectively.

6. A bidirectional high-pressure sealing knife gate valve according to claim 5, characterized in that: Two pushing gear rods are installed on the bottom side of the extrusion frame, and the two pushing gear rods are respectively located on both sides of the supporting base, and driving gears are installed on the sides of the two transfer rods on the same side that are away from each other, and the two driving gears are meshed with the two pushing gear rods; A support shaft is installed inside the transfer rod and the driving gear, and the support shaft is rotatably installed on one side of the support base.

7. A bidirectional high pressure sealing knife gate valve according to claim 6, characterized in that: A buffer groove is provided on the bottom side of the pushing gear rod, a buffer rod is movably installed in the buffer groove, and the bottom end of the buffer rod is installed in the supporting base; A buffer spring is installed at the top end of the buffer rod, and the top end of the buffer spring is installed on the top inner wall of the buffer groove.

8. A bidirectional high pressure sealing knife gate valve according to claim 1, characterized in that: It also includes an automatic closed lubricating device, which is installed in one of the outer closed boxes and is used to seal and lubricate the screw rod; The automatic closed lubrication device comprises two closed covers, the two closed covers are in contact with each other, the screw rod is closed in the two closed covers, oil pipes are installed on the two closed covers, an oil storage tank is movably sleeved on the oil pipes, the oil storage tank is installed on the inner wall of the outer closed box, and push-pull seats are installed on the two oil pipes on the same side; Two wedge-shaped push racks are installed on one side of the outer closed box, and the two wedge-shaped push racks are respectively inserted into the two push-pull seats.

9. A bidirectional high pressure sealing knife gate valve according to claim 8, characterized in that: A return spring is installed on one side of the push-pull seat, and the other end of the return spring is installed on the oil storage tank; A closing seat is installed on the inner wall of the oil storage tank, and the oil pipeline is movably inserted into the closing seat to close the oil pipeline.

10. A bidirectional high pressure sealing knife gate valve according to claim 9, characterized in that: The oil delivery pipe is sleeved with a sealing sleeve, the sealing sleeve is in contact with the inner wall of the oil storage tank, and the sealing sleeve is used to seal the connection between the oil storage tank and the oil delivery pipe; The oil delivery pipe is communicated with the closed cover, and the closed cover is hollow. A plurality of oil outlet holes are opened on one side of the closed cover, and the lubricating oil flows out through the oil outlet holes. A sponge is arranged inside the closed cover.

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