A fire hydrant valve

Abstract

This invention relates to the field of fire-fighting equipment technology and discloses a fire hydrant valve, including an external pipe, an inlet pipe, a valve body, a small-diameter connector, and a large-diameter connector. In this invention, when the water pipe is connected to the coupling mechanism, the buckle slides into the side of the force plate under the elastic bending of the force plate. At this time, the water pipe compresses the spring, and under the compression force of the spring, the buckle engages with the outside of the force plate. Thus, the water pipe drives the force plate to rotate through the buckle, and the rotating plate structure rotates 90° in the extension pipe. When the water pipe is disengaged, the water pipe is pressed again, so that the buckle reaches the left side of the triangular block under the elastic bending of the force plate. The buckle drives the sliding rod on the side of the triangular block to slide inward on the track outside the force plate, so that the buckle disengages from the contact of the force plate. Under the sliding guidance of the triangular block, it disengages from the force plate and is released from engagement. The water pipe engagement mechanism achieves the effects of quick connection, quick disassembly, and quick water supply.

Description

Technical Field

[0001] This invention relates to the field of fire protection equipment technology, specifically a fire hydrant valve. Background Technology

[0002] Fire hydrant valves are key equipment in fire protection systems used to control water flow. They are mainly used for rapid water supply and have functions such as shut-off, regulation, and diversion to ensure that the fire water system can supply water quickly in emergencies. The valve outlet is usually connected to fire hoses, nozzles, fire trucks, and other fire protection facilities. Fire hydrants are installed on each floor of residential buildings, office buildings, and other buildings. Each fire hydrant has a separate water inlet channel, and the connection between each fire hydrant and the floors of the building is controlled by valves to open and achieve the effect of emergency fire extinguishing.

[0003] However, when connecting fire hydrants to hoses, a spiral connection is usually used to connect the outlet. Since the outlet is prone to rusting after contact with water, the spiral connection can be blocked by the rusted spiral channel, making it impossible to quickly connect the hose and thus affecting the rapid water supply for fire extinguishing. In addition, fire hydrant valves are shut off by turning the handle to change the valve position. There is a gap between the turning position and the fire hydrant valve body. Water can easily enter the gap inside the valve body, and the turning position can be affected by the water flow and rust. The intrusion of water can cause rotational rusting, which can reduce the resistance to turning. Summary of the Invention

[0004] The present invention provides a fire hydrant valve that overcomes the shortcomings described in the background art.

[0005] The technical solution adopted by this invention to solve its technical problem is:

[0006] A fire hydrant valve includes an external pipe, an inlet pipe, a valve body, a small-diameter connector, and a large-diameter connector. The valve body is connected to an underground inlet pipe through the external pipe. The small-diameter connectors are symmetrically distributed on both sides of the valve body. The large-diameter connector is located on the side of the valve body and is positioned below the small-diameter connector.

[0007] The valve body comprises a valve core structure, a hexagonal rod, a lower base, an upper base, an inclined tube, a closing plate, an interface mechanism, and a water pipe. The lower base is located inside the water pipe, and the water pipe is vertically installed at the lower end of the upper base. Interface mechanisms are located inside the inclined tubes on both sides of the upper base. The closing plate is located at the lower end of the valve core structure and is perpendicularly pressed against the lower base inside the water pipe. A first cavity and a second cavity are located below the upper base. The first cavity corresponds to the inlet end of the large-diameter connector, and the left and right sides of the second cavity correspond to the inlet ends of the inclined tubes. Water flows out from the outer end of the inclined tubes through the small-diameter connectors at an angle. The valve core structure rotates on the upper base via the hexagonal rod at the top, sequentially opening and closing the large-diameter connector and the small-diameter connector connecting the first cavity and the second cavity to drain water.

[0008] A preferred technical solution: The interface mechanism includes a fixed plate, a spring, a connecting mechanism, an extension tube, and a rotating plate structure. The extension tube is located at the outer end of the inclined tube. The fixed plate is located inside the extension tube corresponding to the rotating plate structure. The connecting mechanism is connected to a water pipe at the outer end of the rotating plate structure, and the rotating plate structure rotates within the extension tube, causing the rotating plate structure and the fixed plate to abut against each other. The spring is elastically movable at the outer end of the extension tube. The connecting mechanism rotates 90° and closes with the fixed plate in a staggered manner.

[0009] A preferred technical solution: The connecting mechanism includes a force-bearing plate, a sliding rod, a first spring, and a triangular block. The inner side of the force-bearing plate is provided with a track, and the sliding rod on the side of the triangular block slides in the corresponding track. The first spring is connected to the force-bearing plate and the triangular block respectively, and moves elastically through the first spring.

[0010] A preferred technical solution: The inner side of the fixed plate is provided with symmetrically distributed first water passage holes, the rotating plate structure is provided with ball bearings, a flat plate and a second water passage hole, the second water passage hole is provided corresponding to the first water passage hole, and the outer side of the flat plate is provided with ball bearings, which slide and rotate 90° inside the extension tube.

[0011] A preferred technical solution: The extension tube is provided with a rubber strip, a movable groove and a tube body. The ball moves in an arc-shaped trajectory in the movable groove, and the rubber strip is attached to the inner side of the tube body at the position corresponding to the movable groove. When the ball moves in an arc-shaped trajectory at the position of the movable groove, the ball is compressed and rolled inside the rubber strip, and the ball is locked at the left and right ends of the rubber strip.

[0012] A preferred technical solution: The valve core structure includes a screw, a connecting block, a support plate, a sealing mechanism, a connecting rod, and a roller. The connecting rod and the screw are located on the same central axis and are connected and rotated through the roller. An annular connecting block is provided on the outside of the connecting rod. The support plate is fixed to the lower end of the upper base, and the screw rotates through the middle of the support plate. When the connecting rod moves downward, the sealing mechanism stretches downward.

[0013] A preferred technical solution: The sealing mechanism includes a rubber plate, a second spring, and a sponge filling block. The sponge filling block is attached to the inner side of the rubber plate. The second spring is stretched inside the sponge filling block, and the upper and lower ends of the second spring are respectively connected to the support plate and the connecting block. The upper and lower ends of the rubber plate are inclined and fixed between the support plate and the connecting block. When the connecting block moves downward, the second spring is elastically stretched and prevents the connecting block from rotating sideways.

[0014] Compared with existing technologies, this technical solution has the following advantages:

[0015] In this invention, when the water pipe is connected to the coupling mechanism, the buckle slides into the side of the force plate under the elastic bending of the force plate. At this time, the water pipe compresses the spring sheet, and under the compression force of the spring sheet, the buckle engages with the outside of the force plate. Thus, the water pipe drives the force plate to rotate through the buckle, and the rotating plate structure rotates 90° in the extension tube. When the water pipe is disengaged, the water pipe is pressed again, so that the buckle reaches the left side of the triangular block under the elastic bending of the force plate. The buckle drives the sliding rod on the side of the triangular block to slide inward on the track outside the force plate, so that the buckle disengages from the contact of the force plate and is released from the force plate under the sliding guidance of the triangular block.

[0016] In this invention, when the screw moves downward spirally within the upper base, the screw drives the connecting rod downward through the connecting rod. The connecting rod rotates through the bearing of the roller shaft to avoid rotating with the screw, thus retaining the downward force of the screw. Furthermore, the connecting rod is stretched between the second spring at the upper end of the connecting block and the support plate, which in turn blocks the rotational force of the connecting rod. Consequently, the rubber plate stretches downward along with the connecting block and the connecting rod. With the support plate fixed to the upper base, the gap on the outside of the support plate is sealed to prevent water from entering the gap on the outside of the screw in the second cavity, thus preventing water from entering and causing rust, and preventing rust from affecting the rotation of the screw's spiral rotation position. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is an overall diagram of the present invention.

[0019] Figure 2 This is a side view of the valve body.

[0020] Figure 3 This is a side view of the interface mechanism.

[0021] Figure 4 This is a side view of the engagement mechanism.

[0022] Figure 5 This is a plan view of the fixed plate.

[0023] Figure 6 This is a plan view of the extension tube and rotating plate structure.

[0024] Figure 7 This is a side view of the valve core structure.

[0025] Figure 8 This is a cross-sectional schematic diagram of the sealing mechanism.

[0026] In the diagram: External pipe-1, Inlet pipe-2, Valve body-3, Small diameter connector-4, Large diameter connector-5, Valve core structure-31, Hexagonal rod-32, Lower base-33, Upper base-34, Inclined pipe-35, Closing plate-36, Interface mechanism-37 and water pipe-38, Fixing plate-21, Spring piece-22, Connecting mechanism-23, Extension pipe-24, Rotating plate structure-25, Force plate-231, Slide rod-232, First spring Spring-233, Triangular block-234, Buckle-101, First water passage hole-102, Ball bearing-251, Flat plate-252, Second water passage hole-253, Rubber strip-241, Movable groove-242, Pipe body-243, Screw-311, Connecting block-312, Support plate-313, Sealing mechanism-314, Connecting rod-315, Roller-316, Rubber plate-41, Second spring-42, Sponge filling block-43. Detailed Implementation

[0027] like Figures 1 to 8 As shown, the present invention proposes a fire hydrant valve, including an external pipe 1, a water inlet pipe 2, a valve body 3, a small-diameter connector 4, and a large-diameter connector 5. The valve body 3 is connected to the underground water inlet pipe 2 through the external pipe 1. The small-diameter connectors 4 are symmetrically distributed on both sides of the valve body 3. The large-diameter connectors 5 are located on the side of the valve body 3 and are located below the small-diameter connectors 4.

[0028] The valve body 3 includes a valve core structure 31, a hexagonal rod 32, a lower base 33, an upper base 34, an inclined tube 35, a closing plate 36, an interface mechanism 37, and a water pipe 38. The lower base 33 is located inside the water pipe 38, and the water pipe 38 is vertically installed at the lower end of the upper base 34. Interface mechanisms 37 are provided inside the inclined tubes 35 on both sides of the upper base 34. The closing plate 36 is located at the lower end of the valve core structure 31, and the closing plate 36 vertically presses against the lower base 33 inside the water pipe 38. The upper base 34 is provided with a first cavity 301 and a second cavity 302 below it. The first cavity 301 corresponds to the inlet end of the large-diameter connector 5, and the left and right sides of the second cavity 302 correspond to the inlet ends of the inclined pipe 35. Water flows out from the outer end of the inclined pipe 35 through the small-diameter connector 4. The valve core structure 31 rotates in the upper base 34 through the hexagonal rod 32 at the top, opening and closing the large-diameter connector 5 and the small-diameter connector 4 that connect the first cavity 301 and the second cavity 302 in sequence to drain water.

[0029] Furthermore, the outer end of the inclined pipe 35 is connected to the small-diameter connector 4, and the first cavity 301 is connected to the first cavity 301. The hexagonal rod 32 is rotated by a special wrench, which drives the valve core structure 31 to move spirally within the upper base 34, thereby disengaging the closing plate 36 from the pressure of the lower base 33. Water flows into the first cavity 301 under the obstruction of the closing plate 36. At this time, the water only flows from the first cavity 301 to the large-diameter connector 5. After the first cavity 301 moves upward into the second cavity 302, the water can flow from the second cavity 302 to the inclined pipes 35 on both sides. The interface mechanism 37 is not only set in the two inclined pipes 35, but also in the large-diameter connector 5. The interface mechanism 37 can only be opened and closed after the water pipe is connected, so that when the water pipe is only connected to the small-diameter connector 4... When the water flowing from the first cavity 301 to the large-diameter connector 5 is blocked by the interface mechanism 37, three situations arise when the hexagonal rod 32 drives the valve core structure 31 to rotate. First, the closing plate 36 is spirally driven by the valve core structure 31 to the top of the water pipe 38. At this time, the water flow only exits from the large-diameter connector 5 corresponding to the first cavity 301. Second, the closing plate 36 is inside the second cavity 302, while the external water pipe is only connected to the interface mechanism 37. At this time, the water flow only exits from the interface mechanism 37 to the small-diameter connector 4. Third, the closing plate 36 is inside the second cavity 302, while the external water pipe is connected to the interface mechanism 37 and the large-diameter connector 5. At this time, the water flow exits from both small-diameter connectors 4 and the large-diameter connector 5 simultaneously. The closing plate 36 can be adjusted to cut off the water flow according to the water pipe connected, thereby achieving multiple drainage effects.

[0030] Furthermore, the lower base 33 is hollow in the middle, and a rubber sealing ring is provided at the upper end of the lower base 33. When the closing plate 36 moves downward, the corresponding sealing ring is compressed, and water flows in from the water inlet connected to the lower end of the water inlet pipe 2. Then, when the closing plate 36 presses against the sealing ring at the upper end of the lower base 33, it remains in a closed state. When the outer pipe 1 at the upper end of the valve core structure 31 is manually turned, the valve core structure 31 moves upward, and the closing plate 36 is released from the sealing ring on the lower base 33. The water flows through the first cavity 301 and the second cavity 302 towards the inclined pipe 35 and the large-diameter connector 5. The interface mechanism 37 at the outer end of the inclined pipe 35 is quickly connected to the water pipe, and the water flows out with the water pipe. The outer pipe 1 can only be turned to open and close the drain after the interface mechanism 37 is connected to the water pipe.

[0031] The interface mechanism 37 includes a fixing plate 21, a spring 22, a connecting mechanism 23, an extension tube 24, and a rotating plate structure 25. The extension tube 24 is located at the outer end of the inclined tube 35. The fixing plate 21 is located inside the extension tube 24 corresponding to the rotating plate structure 25. The connecting mechanism 23 is connected to a water pipe at the outer end of the rotating plate structure 25, and the rotating plate structure 25 rotates within the extension tube 24, causing the rotating plate structure 25 and the fixing plate 21 to abut against each other. The spring 22 moves elastically at the outer end of the extension tube 24. The connecting mechanism 23 rotates 90° and closes with the fixing plate 21 in a staggered manner.

[0032] Furthermore, the spring piece 22 is made of annular rubber material, and a gasket is provided on the outer side of the spring piece 22. A buckle 101 is provided at the water pipe position, and the water pipe is engaged with the connecting mechanism 23 through the buckle 101. At this time, the water pipe also needs to press the gasket and compress the spring piece 22. The water pipe is elastically pressed against the side of the spring piece 22 through the spring piece 22. At this time, the buckle 101 drives the connecting mechanism 23 to rotate the rotating plate structure 25 by 90°, and causes the rotating plate structure 25 and the fixed plate 21 to open and close in a misaligned manner.

[0033] The connecting mechanism 23 includes a force plate 231, a slide bar 232, a first spring 233, and a triangular block 234. The inner side of the force plate 231 is provided with a track, and the slide bar 232 on the side of the triangular block 234 slides in the corresponding track. The first spring 233 is connected to the force plate 231 and the triangular block 234 respectively, and moves elastically through the first spring 233.

[0034] Furthermore, the load-bearing plate 231 is made of aluminum alloy, possessing a certain degree of toughness and elastic bending force. Two load-bearing plates 231 are provided, symmetrically distributed on the side of the rotating plate structure 25. The buckle 101 on the water pipe corresponds to the outer side of the load-bearing plate 231. In this invention, when the water pipe is connected to the connecting mechanism 23, the buckle 101 slides into the side of the load-bearing plate 231 under the elastic bending of the load-bearing plate 231. At this time, the water pipe compresses the spring sheet 22, and under the compressive force of the spring sheet 22, the buckle 101 engages with the outer side of the load-bearing plate 231, thereby allowing the water pipe to pass through. The buckle 101 drives the force plate 231 to rotate, and the rotating plate structure 25 rotates 90° inside the extension tube 24. When the water pipe is disengaged, the water pipe is pressed again, so that the buckle 101 reaches the left side of the triangular block 234 under the elastic bending of the force plate 231. The buckle 101 drives the slide rod 232 on the side of the triangular block 234 to slide on the track outside the force plate 231, so that the buckle 101 disengages from the contact of the force plate 231 and is released from the force plate 231 under the sliding guidance of the triangular block 234.

[0035] Furthermore, the spring piece 22 is compressed when the buckle 101 engages with the force plate 231. When the buckle 101 slides and guides the triangular block 234, the position of the buckle 101 is closer to the left. At this time, the spring piece 22 is at its compression limit. In this invention, under the sliding guidance of the triangular block 234, the buckle 101 will quickly disengage from the outside of the connecting mechanism 23 under the elastic force of the spring piece 22. Thus, the water pipe can be connected by pressing the buckle 101 against the connecting mechanism 23. By rotating the water pipe, the buckle 101 on the water pipe rotates the connecting mechanism 23, which can quickly close and open the misaligned plate structure 25 and the fixed plate 21. The water pipe engages with the connecting mechanism 23 to achieve the effects of quick connection, quick disassembly, and quick water supply. The outer pipe 1 screws the valve core structure 31 to create a distance between the closing plate 36 and the lower base 33 for water flow, which has the effect of regulating water flow.

[0036] The fixed plate 21 has symmetrically distributed first water passage holes 102 on its inner side. The rotating plate structure 25 has a ball bearing 251, a flat plate 252 and a second water passage hole 253. The second water passage hole 253 is arranged corresponding to the first water passage hole 102. The flat plate 252 has a ball bearing 251 on its outer side. The ball bearing 251 slides and rotates 90° inside the extension tube 24.

[0037] The extension tube 24 is provided with a rubber strip 241, a movable groove 242 and a tube body 243. The ball bearing 251 moves in an arc-shaped trajectory within the movable groove 242, and the rubber strip 241 is attached to the inner side of the tube body 243 at the position corresponding to the movable groove 242. When the ball bearing 251 moves in an arc-shaped trajectory at the position of the movable groove 242, the ball bearing 251 is compressed and rolled inside the rubber strip 241, and the ball bearing 251 is engaged at the left and right ends of the rubber strip 241.

[0038] Furthermore, the rubber strip 241 has arc-shaped hollow positions on both sides, which correspond to the external shape of the ball 251, so that the ball 251 is limited in the hollow position.

[0039] Furthermore, the second water passage 253 and the first water passage 102 are located on the same central axis, and the fixed plate 21 and the flat plate 252 press and rub against each other. When the second water passage 253 and the first water passage 102 overlap, they are in an open or closed state, and water flows through the second water passage 253 and the first water passage 102. When the second water passage 253 and the first water passage 102 are misaligned and closed, the water flow is blocked on the left side of the fixed plate 21. When the flat plate 252 is rotated by the engaging mechanism 23, it drives the ball 251 to roll inside the rubber strip 241. Thus, the ball 251 moves 90° in the movable groove 242 and then disengages from the rubber strip 241. At this time, the ball 251 is just in the arc-shaped hollow position on the side of the rubber strip 241. Under the elasticity of the rubber strip 241, a certain locking effect is formed to ensure that the rotating plate structure 25 is in a relatively stable state after rotation.

[0040] The valve core structure 31 includes a screw 311, a connecting block 312, a support plate 313, a sealing mechanism 314, a connecting rod 315, and a roller 316. The connecting rod 315 and the screw 311 are located on the same central axis and are connected and rotated through the roller 316. An annular connecting block 312 is provided on the outer side of the connecting rod 315. The support plate 313 is fixed to the lower end of the upper base 34, and the screw 311 rotates through the middle of the support plate 313. When the connecting rod 315 moves downward, the sealing mechanism 314 is stretched downward.

[0041] The sealing mechanism 314 includes a rubber plate 41, a second spring 42, and a sponge filling block 43. The sponge filling block 43 is attached to the inner side of the rubber plate 41. The second spring 42 is stretched inside the sponge filling block 43, and its upper and lower ends are respectively connected to the support plate 313 and the connecting block 312. The upper and lower ends of the rubber plate 41 are inclined and fixed between the support plate 313 and the connecting block 312. When the connecting block 312 moves downward, the second spring 42 is elastically stretched and prevents the connecting block 312 from rotating sideways.

[0042] Furthermore, the screw 311 moves spirally within the upper base 34, and the upper end of the screw 311 rotates through the outer tube 1. The lower end of the connecting rod 315 is fixed with a closing plate 36.

[0043] In this invention, when the screw 311 moves downward spirally within the upper base 34, the screw 311 drives the connecting rod 315 downward through the connecting rod 315. The connecting rod 315 rotates through the bearing of the roller 316 to avoid rotating with the screw 311, thus retaining the downward force of the screw 311. Furthermore, the connecting rod 315 is stretched between the second spring 42 at the upper end of the connecting block 312 and the support plate 313, thereby blocking the rotational force of the connecting rod 315 through the second spring 42. Subsequently, the rubber plate 41 is stretched downward along with the connecting block 312 and the connecting rod 315. With the support plate 313 fixed to the upper base 34, the gap on the outside of the support plate 313 is sealed to prevent water from entering the gap on the outside of the screw 311 in the second cavity 302, preventing water from entering and causing rust, and preventing rust from occurring at the spiral rotation position of the screw 311, which would affect its rotation.

[0044] The above description is merely a preferred embodiment of the present invention, and therefore should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made in accordance with the scope of the patent and the contents of the specification should still fall within the scope of the present invention.

Claims

1. A fire hydrant valve, characterized in that, It includes an external pipe, an inlet pipe, a valve body, a small-diameter connector, and a large-diameter connector. The valve body is connected to the underground inlet pipe through the external pipe. The small-diameter connectors are symmetrically distributed on both sides of the valve body. The large-diameter connectors are located on the side of the valve body and are located below the small-diameter connectors. The valve body is provided with a valve core structure, a hexagonal rod, a lower base, an upper base, an inclined tube, a closing plate, an interface mechanism, and a water pipe. The lower base is located inside the water pipe, and the water pipe is vertically installed at the lower end of the upper base. Interface mechanisms are provided inside the inclined tubes on both sides of the upper base. The closing plate is located at the lower end of the valve core structure, and the closing plate is perpendicular to the lower base inside the water pipe. A first cavity and a second cavity are provided below the upper base. The first cavity corresponds to the inlet end of the large-diameter connector, and the left and right sides of the second cavity correspond to the inlet ends of the inclined tubes. Water flows out from the outer end of the inclined tube through the small-diameter connector at an angle. The valve core structure rotates on the upper base through the hexagonal rod at the top, opening and closing the large-diameter connector and the small-diameter connector connecting the first cavity and the second cavity in sequence to drain water. The interface mechanism includes a fixed plate, a spring, a connecting mechanism, an extension tube, and a rotating plate structure. The extension tube is located at the outer end of the inclined tube. The fixed plate is located inside the extension tube corresponding to the rotating plate structure. The connecting mechanism is connected to the water pipe at the outer end of the rotating plate structure, and the rotating plate structure rotates within the extension tube, causing the rotating plate structure and the fixed plate to abut against each other. The spring is elastically movable at the outer end of the extension tube. The connecting mechanism rotates 90° and closes with the fixed plate in a staggered manner. The valve core structure includes a screw, a connecting block, a support plate, a sealing mechanism, a connecting rod, and a roller. The connecting rod and the screw are located on the same central axis and are connected and rotated through the roller. An annular connecting block is provided on the outside of the connecting rod. The support plate is fixed to the lower end of the upper base, and the screw passes through the middle of the support plate and rotates. When the connecting rod moves downward, the connecting block pulls the sealing mechanism downward. The sealing mechanism includes a rubber plate, a second spring, and a sponge filling block. The sponge filling block is attached to the inner side of the rubber plate. The second spring is stretched inside the sponge filling block, and the upper and lower ends of the second spring are respectively connected to the support plate and the connecting block. The upper and lower ends of the rubber plate are inclined and fixed between the support plate and the connecting block. When the connecting block moves downward, the second spring is elastically stretched and prevents the connecting block from rotating sideways.

2. A fire hydrant valve according to claim 1, characterized in that, The connecting mechanism includes a force plate, a sliding rod, a first spring, and a triangular block. The inner side of the force plate is provided with a track, and the sliding rod on the side of the triangular block slides in the corresponding track. The first spring is connected to the force plate and the triangular block respectively, and moves elastically through the first spring.

3. A fire hydrant valve according to claim 2, characterized in that, The fixed plate has symmetrically distributed first water passage holes on its inner side. The rotating plate structure has a ball bearing, a flat plate, and a second water passage hole. The second water passage hole is arranged corresponding to the first water passage hole. The flat plate has a ball bearing on its outer side, which slides and rotates 90° inside the extension tube.

4. A fire hydrant valve according to claim 3, characterized in that, The extension tube is provided with a rubber strip, a movable groove and a tube body. The ball moves in an arc-shaped trajectory in the movable groove, and the rubber strip is attached to the inner side of the tube body at the position corresponding to the movable groove. When the ball moves in an arc-shaped trajectory at the position of the movable groove, the ball is compressed and rolled inside the rubber strip, and the ball is locked at the left and right ends of the rubber strip.

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