Fire hose connector

Abstract

The present invention belongs to the technical field of fire hose joints, and specifically is a fire hose joint, comprising an outer shell, an inner tube fixedly installed in the outer shell, a fixing mechanism for fixing the fire hose is arranged between the inner tube and the outer shell, the fixing mechanism comprises a fixing plate, the fixing plate is installed between the inner tube and the outer shell, three groups of arc-shaped clamping plates are distributed at equal angles on one side of the fixing plate, the other side of the fixing plate fits one end face of a sleeve, the sleeve is rotatably sleeved on the inner tube, a worm wheel fixedly sleeved on the sleeve, a worm gear meshing with the worm wheel, and the worm gear is connected to the outer shell, and the end of the fire hose only needs to be inserted into the rear end of the outer shell, and the end of the fire hose can be fixed by screwing the worm gear, the operation is simple and fast, and the user is convenient for installing the joint, and secondly, the fixing mechanism is arranged in the outer shell, so that there are no sharp protrusions on the outer surface of the outer shell, thereby avoiding scratches on the user's hands.

Description

Technical Field

[0001] The invention belongs to the technical field of fire hose joints, in particular to a fire hose joint. Background Art

[0002] The joints on the fire hoses are key components used to connect the fire hoses to other firefighting equipment, ensuring that the water flow can be smoothly transmitted in the firefighting system. This type of joint is called a fire hose joint. Its design enables fire hoses to be connected quickly and securely.

[0003] The patent with announcement number CN219453212U discloses a fire hose fastening joint, including a first joint and a second joint. A connecting sleeve is fixedly installed on the left side of the first joint, a filtering mechanism is provided on the inner side of the connecting sleeve, and a limiting ring is fixedly connected to the outer side of the connecting sleeve. A fixing mechanism is provided on the outer side of the connecting sleeve, and the fixing mechanism includes a first mounting block and a second mounting block. The lower ends of the first mounting block and the second mounting block are hingedly connected by a hinge assembly. The scheme is achieved by putting the fire hose on the connecting sleeve, and then placing the first mounting block and the second mounting block between the limiting rings, and then plugging the arc block on the first mounting block and the first mounting block. The fire hose is fixed by screwing the fixing bolts, so that firefighters can install and disassemble the fire hose more conveniently.

[0004] In the above scheme, the fire hose is fixed by a fixing mechanism. Although the fixing mechanism has a simple structure, it is necessary to place the first mounting block and the second mounting block between the limit rings during operation, and then a series of operations such as plugging in the arc block are required, which makes it troublesome for the staff to install the joint. Secondly, the first mounting block and the bolt are placed on the outer surface of the joint. During the fire extinguishing process, the position of the water spraying needs to be adjusted by dragging the fire hose. In a critical situation, the user does not have the gloves specially worn by firefighters, which may easily cause the first mounting block and the bolt to scratch the user's hands, causing unnecessary harm to the personnel. For this reason, the present invention provides a fire hose joint. Summary of the invention

[0005] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0006] The technical solution adopted by the present invention to solve its technical problems is as follows: a fire hose joint described in the present invention comprises an outer shell, an inner tube is fixedly installed in the outer shell, a fixing mechanism for fixing the fire hose is arranged between the inner tube and the outer shell, the fixing mechanism comprises a fixing plate, the fixing plate is installed between the inner tube and the outer shell, three groups of arc-shaped clamping plates are distributed at equal angles on one side of the fixing plate, the other side of the fixing plate is in contact with one end face of the sleeve, the sleeve is rotatably sleeved on the inner tube, a worm gear fixedly sleeved on the sleeve, a worm gear meshing with the worm gear, the worm gear is connected to the outer shell, three groups of rectangular grooves are opened at equal angles on the fixing plate, a slider is arranged in the rectangular groove, the slider is plugged into a guide column, the upper end of the guide column is fixedly connected to the inner wall of the rectangular groove, one end of the three groups of sliders is fixedly connected to the three groups of arc-shaped clamping plates respectively, a pin is arranged at the other end of the slider, two groups of first guide grooves are opened on one end face of the sleeve, the pin is located in the first guide groove, the first guide groove is composed of a first arc groove and a first oblique groove, and a rubber pad is arranged on the inner ring of the arc-shaped clamping plate;

[0007] It is only necessary to insert the end of the fire hose into the rear end of the outer shell, and the end of the fire hose can be fixed by screwing the worm. The operation is simple and fast, and it is convenient for users to install the joint. Secondly, the fixing mechanism is arranged in the outer shell, so that there are no sharp protrusions on the outer surface of the outer shell, thereby avoiding scratches on the user's hands.

[0008] Preferably, the inner tube includes a tube body, which is fixedly installed in the outer shell, and a plurality of groups of guide grooves are provided at equal angles on one end of the tube body, and extension slats are movably installed in the plurality of guide grooves, and one end of the plurality of extension slats is fixedly connected to the fixing ring, and two groups of avoidance grooves are symmetrically provided in the other end of the tube body, and L-shaped rods are movably inserted in the avoidance grooves, and one end of the two groups of L-shaped rods is respectively connected to the other end of the two groups of extension slats, and two groups of second guide grooves are provided on the tube body of the sleeve, and the other end of the L-shaped rod is located in the second guide groove, and the second guide groove consists of a spiral groove and a second arc groove, and the tube body passes through the sleeve and the fixing plate, and the sleeve is rotatably sleeved on the tube body, and the fixing ring fits one end face of the tube body;

[0009] The other end of the L-shaped rod slides along the second arc groove, and the second arc groove is set so that the annular columnar structure will not continue to move, and the pin shaft will slide along the first oblique groove, thereby achieving the above-mentioned tight wrapping of the end of the fire hose on the tail end of the inner tube, so that the joint can be used for fire hoses of different hardness, thereby improving the practicality of the device.

[0010] Preferably, the extended slat includes a plate body, the plate body is slidably connected to the guide groove, four groups of retreat grooves are provided on the plate body, a movable block movably inserted in the retreat groove, a limit strip fixedly connected to one end of the movable block, the other ends of the four groups of limit strips are fixedly connected to the linkage plate, one end of the plate body is fixedly connected to the fixing ring, the other end of the plate body is fixedly connected to the L-shaped rod, the third guide groove is provided on both sides of the two groups of guide grooves, a convex shaft is provided at one end of the linkage plate, the end of the convex shaft is located in the third guide groove, the third guide groove consists of a straight groove and a second oblique groove, the linkage plate is slidably connected to the inner cavity of the plate body, movable grooves are provided on both sides of the other end of the plate body, and the end of the convex shaft passes through the movable groove and extends into the third guide groove;

[0011] The fire hose has a certain elasticity. Under the action of its own rebound force, the end of the fire hose is wrapped around the annular columnar structure. At this time, the finger pressing the tail of the annular columnar structure can be removed, and the end of the fire hose will enter the tail end of the outer shell along with the annular columnar structure, so that the staff only needs to press with their fingers at the starting stage when the fire hose enters the tail end of the outer shell, thereby improving the convenience of the staff in installing the joint.

[0012] The beneficial effects of the present invention are as follows:

[0013] 1. Simply insert the end of the fire hose into the rear end of the outer shell, and then screw the worm to fix the end of the fire hose. The operation is simple and quick, and it is convenient for users to install the joint. Secondly, the fixing mechanism is arranged in the outer shell, so that there are no sharp protrusions on the outer surface of the outer shell, thereby avoiding scratches on the user's hands.

[0014] 2. The two groups of extension slats drive the fixing ring together with the rest of the extension slats to move, so that several groups of extension slats extend to the outside of the rear end of the outer shell, so that several groups of extension slats form a group of annular columnar structures outside the rear end of the outer shell. At this time, the user sets the end of the fire hose on the annular columnar structure, and then presses the tail of the annular structure with fingers, so that the end of the fire hose is pre-fixed on the annular structure. The other hand uses a wrench to twist the worm, so that the annular columnar structure begins to retract into the rear end of the outer shell, and at the same time, the hand holding the tail of the annular columnar structure moves along with the annular structure. The columnar structure moves synchronously, so that the end of the fire hose enters the tail end of the outer shell, and the fire hose is sleeved on one end of the tube body until the other end of the L-shaped rod slides to the intersection of the spiral groove and the second arc groove. At this time, the pin is located at the intersection of the first arc groove and the first oblique groove. As the sleeve continues to rotate, the other end of the L-shaped rod slides along the second arc groove, and the pin will slide along the first oblique groove, thereby achieving the above-mentioned tight wrapping of the end of the fire hose on the tail end of the inner tube, so that the joint can be suitable for fire hoses of different hardness, thereby improving the practicality of the device.

[0015] 3. Under the guidance of the second oblique groove, the four groups of limit strips are respectively entered into the four groups of retreat grooves on the plate body, so that the outer diameter of the annular columnar structure composed of the four groups of extended strips becomes smaller. At this time, the inner diameter of the selected fire hose is equal to the annular columnar structure with a smaller outer diameter, and the fire hose is put on the annular columnar structure, and then the finger presses the tail of the annular columnar structure so that the end of the fire hose is pre-fixed on the annular columnar structure. The other hand uses a wrench to screw the worm gear so that the end of the fire hose moves toward the rear end of the outer shell along with the annular columnar structure. Under the guidance of the second oblique groove, the limit strip is separated from the retreat groove. Under the action of the fire hose's own rebound force, the end of the fire hose is covered on the annular columnar structure, and the end of the fire hose will enter the rear end of the outer shell along with the annular columnar structure, so that the staff only needs to press with their fingers at the starting stage when the fire hose enters the rear end of the outer shell, thereby improving the convenience of the staff in installing the joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the accompanying drawings.

[0017] Figure 1 It is a schematic diagram of the structure of the present invention.

[0018] Figure 2 It is a schematic cross-sectional view of the structure of the present invention.

[0019] Figure 3 It is a schematic diagram of the combination of the fixing plate, the arc-shaped clamping plate and the sleeve of the present invention.

[0020] Figure 4 It is a cross-sectional schematic diagram of the outer shell, inner tube, arc-shaped clamping plate and sleeve assembly of the present invention.

[0021] Figure 5 It is a schematic diagram of another state of the inner tube, slider, pin and sleeve combination of the present invention.

[0022] Figure 6 It is a cross-sectional schematic diagram of the tube body, guide groove, extension strip, fixing ring and L-shaped rod assembly of the present invention.

[0023] Figure 7 It is a schematic cross-sectional view of the extended slat of the present invention.

[0024] Figure 8 It is a schematic diagram of the combination of the tube body, guide groove and extension strips of the present invention.

[0025] In the figure: 1, outer shell; 2, inner tube; 3, fixing mechanism; 4, fire hose; 301, fixing plate; 3011, rectangular groove; 3012, slider; 3013, pin; 3014, guide column; 302, arc clamping plate; 303, sleeve; 3031, first guide groove; 311, first arc groove; 312, first oblique groove; 3032, second guide groove; 321, spiral groove; 322, second arc groove; 304, worm gear ; 305, worm; 306, rubber pad; 201, tube body; 202, guide groove; 2021, third guide groove; 211, straight groove; 212, second oblique groove; 203, extension strip; 204, fixing ring; 205, avoidance groove; 206, L-shaped rod; 2031, plate body; 31, movable groove; 2032, retreat groove; 2033, movable block; 2034, limit strip; 2035, linkage plate; 351, cam shaft. DETAILED DESCRIPTION

[0026] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0027] Embodiment 1: Figures 1 to 4 As shown, a fire hose joint according to an embodiment of the present invention comprises an outer shell 1, an inner tube 2 is fixedly installed in the outer shell 1, a fixing mechanism 3 for fixing a fire hose 4 is arranged between the inner tube 2 and the outer shell 1, the fixing mechanism 3 comprises a fixing plate 301, the fixing plate 301 is installed between the inner tube 2 and the outer shell 1, three groups of arc-shaped clamping plates 302 are distributed at equal angles on one side of the fixing plate 301, the other side of the fixing plate 301 is fitted with one end surface of a sleeve 303, the sleeve 303 is rotatably sleeved on the inner tube 2, a worm gear 304 fixedly sleeved on the sleeve 303, a worm 305 meshing with the worm gear 304, the worm 305 is connected to the outer shell 1, and the fixing plate 3 01, three groups of rectangular grooves 3011 are opened at equal angles, and sliders 3012 are arranged in the rectangular grooves 3011. The sliders 3012 are plugged into guide posts 3014, and the upper ends of the guide posts 3014 are fixedly connected to the inner walls of the rectangular grooves 3011. One ends of the three groups of sliders 3012 are respectively fixedly connected to the three groups of arc-shaped clamping plates 302. The other ends of the sliders 3012 are provided with pins 3013. Two groups of first guide grooves 3031 are opened on one end surface of the sleeve 303. The pins 3013 are located in the first guide grooves 3031. The first guide grooves 3031 are composed of a first arc-shaped groove 311 and a first oblique groove 312. A rubber pad 306 is arranged on the inner circle of the arc-shaped clamping plate 302.

[0028] Specifically, in the initial state, the three groups of arc-shaped clamping plates 302 are in a separated state, and the pin shaft 3013 is located at the intersection of the first arc-shaped groove 311 and the first oblique groove 312. When it is necessary to install a joint on the end of the fire hose 4, the inner diameter of the fire hose 4 is slightly larger than the outer diameter of the inner tube 2, and the end of the fire hose 4 is inserted into the tail end of the outer shell 1. As the end of the fire hose 4 is inserted, the tail end of the inner tube 2 is also inserted into the end of the fire hose 4 until the fire hose 4 cannot move into the tail end of the outer shell 1. At this time, the worm 305 is screwed by a hexagonal wrench to rotate the worm wheel 304 together with the sleeve 303, and the rotation direction is downward. Figure 3 The middle arrow indicates the direction. As the sleeve 303 rotates, the three groups of pins 3013 will slide along the corresponding first oblique grooves 312. Under the guidance of the first oblique grooves 312, the pins 3013 drive the slider 3012 to move along the guide column 3014 toward the center of the fixed disk 301. At the same time, the three groups of sliders 3012 drive the three groups of arc clamping plates 302 to move toward each other until the rubber pads 306 on the arc clamping plates 302 are squeezed onto the fire hose 4. At this time, the three groups of arc clamping plates 302 are merged into a group of hollow cylinders, so that the end of the fire hose 4 is tightly wrapped around the tail end of the inner tube 2 to achieve the installation of the joint. Compared with the prior art, it is only necessary to insert the end of the fire hose 4 into the tail end of the outer shell 1, and the end of the fire hose 4 can be fixed by screwing the worm 305. The operation is simple and fast, which is convenient for the user to install the joint. Secondly, the fixing mechanism 3 is arranged in the outer shell 1, so that there are no sharp protrusions on the outer surface of the outer shell 1, thereby avoiding scratches on the user's hands.

[0029] like Figure 4 and Figure 5 As shown, the inner tube 2 includes a tube body 201, which is fixedly installed in the outer shell 1. A plurality of guide grooves 202 are provided at equal angles on one end of the tube body 201, and extension strips 203 are movably installed in the plurality of guide grooves 202. One end of the plurality of extension strips 203 is fixedly connected to a fixing ring 204. Two sets of avoidance grooves 205 are symmetrically provided in the other end of the tube body 201, and L-shaped rods 206 are movably inserted in the avoidance grooves 205. The two sets of L-shaped One end of the rod 206 is connected to the other end of the two groups of extension strips 203 respectively. Two groups of second guide grooves 3032 are opened on the tube body of the sleeve 303. The other end of the L-shaped rod 206 is located in the second guide groove 3032. The second guide groove 3032 is composed of a spiral groove 321 and a second arc groove 322. The tube body 201 passes through the sleeve 303 and the fixed plate 301. The sleeve 303 is rotatably mounted on the tube body 201, and the fixing ring 204 fits one end surface of the tube body 201.

[0030] Specifically, the hardness of the fire hose 4 is designed according to its application scenario and required performance. When the end of the fire hose 4 is smoothly inserted into the rear end of the outer shell 1, the fire hose 4 needs to be relatively hard, so as to ensure that the fire hose 4 can stand straight. However, some fire hoses 4 are relatively soft, so that the fire hose 4 cannot stand straight, which will cause the fire hose 4 to be unable to be inserted into the rear end of the outer shell 1, reducing the practicality of the device. Therefore, when a softer fire hose 4 is selected, the sleeve 303 is first driven to rotate, and the rotation direction is the same as that of the lower attached Figure 3 The middle arrow indicates the opposite direction, so that the three sets of pin shafts 3013 slide along the corresponding first arc groove 311. The setting of the first arc groove 311 will not make the three sets of pin shafts 3013 move toward the center of the fixed plate 301. At the same time, the other ends of the two sets of L-shaped rods 206 slide along the corresponding spiral groove 321. Under the guidance of the spiral groove 321, the two sets of L-shaped rods 206 together with the two sets of extension strips 203 move toward the direction of the fire hose 4. The two sets of extension strips 203 drive the fixing ring 2 04 together with the rest of the extension strips 203, so that several groups of extension strips 203 extend to the outside of the rear end of the outer shell 1, so that several groups of extension strips 203 form a group of annular columnar structures outside the rear end of the outer shell 1. At this time, the user sets the end of the fire hose 4 on the annular columnar structure, and then presses the tail of the annular structure with fingers to pre-fix the end of the fire hose 4 on the annular structure. With the other hand, the worm 305 is screwed with a wrench to make the sleeve 303 move along the lower attachment Figure 3 Rotate in the direction indicated by the middle arrow, so that the annular columnar structure begins to retract into the rear end of the outer shell 1. At the same time, the hand holding the rear end of the annular columnar structure moves synchronously with the annular columnar structure, so that the end of the fire hose 4 enters into the rear end of the outer shell 1. At the same time, the fire hose 4 is sleeved on one end of the tube body 201 until the other end of the L-shaped rod 206 slides to the intersection of the spiral groove 321 and the second arc groove 322. At this time, the pin 3013 is located at the intersection of the first arc groove 311 and the first oblique groove 312. As the sleeve 303 continues to rotate, the other end of the L-shaped rod 206 slides along the second arc groove 322. The second arc groove 322 is set so that the annular columnar structure will not continue to move, and the pin 3013 will slide along the first oblique groove 312, thereby achieving the above-mentioned tight wrapping of the end of the fire hose 4 around the rear end of the inner tube 2, so that the joint can be suitable for fire hoses 4 of different hardness, thereby improving the practicality of the device.

[0031] Embodiment 2: Figures 6 to 8As shown, compared with Example 1, another embodiment of the present invention is: the extension strip 203 includes a plate body 2031, the plate body 2031 is slidably connected to the guide groove 202, four sets of retreat grooves 2032 are provided on the plate body 2031, a movable block 2033 movably plugged into the retreat groove 2032, a limit strip 2034 fixedly connected to one end of the movable block 2033, the other ends of the four sets of limit strips 2034 are all fixedly connected to the linkage plate 2035, one end of the plate body 2031 is fixedly connected to the fixing ring 204, and the plate body 2031 The other end is fixedly connected to the L-shaped rod 206, and third guide grooves 2021 are opened on both sides of the two sets of guide grooves 202. A convex shaft 351 is arranged at one end of the linkage plate 2035, and the end of the convex shaft 351 is located in the third guide groove 2021. The third guide groove 2021 is composed of a straight groove 211 and a second oblique groove 212. The linkage plate 2035 is slidably connected to the inner cavity of the plate body 2031, and movable grooves 31 are opened on both sides of the other end of the plate body 2031. The end of the convex shaft 351 passes through the movable groove 31 and extends into the third guide groove 2021.

[0032] Specifically, in the process of placing the softer end of the fire hose 4 into the rear end of the outer shell 1, the staff needs to operate the wrench with one hand and hold the end of the fire hose 4 with the other hand, which makes it inconvenient for the staff to operate. Therefore, in the process of the annular columnar structure coming out of the rear end of the outer shell 1, the plate 2031 slides along the guide groove 202, and at the same time, the two ends of the end of the convex shaft 351 slide along the two sets of linear grooves 211 respectively. When the convex shaft 351 slides into the second oblique groove 212, Under the guidance of the second oblique groove 212, the convex shaft 351 drives the linkage plate 2035 together with the four groups of movable blocks 2033 and the four groups of limit strips 2034 to move toward the central axis of the outer shell 1, so that the four groups of limit strips 2034 respectively enter the four groups of concession grooves 2032 on the plate body 2031, so that the outer diameter of the annular columnar structure composed of the four groups of extension strips 203 becomes smaller. At this time, the inner diameter of the selected fire hose 4 is equal to the annular columnar structure with a smaller outer diameter, and the fire hose 4 The fire hose 4 is pre-fixed on the annular columnar structure by pressing the rear end of the annular columnar structure with one hand, and the worm 305 is screwed with the other hand to move the end of the fire hose 4 toward the rear end of the outer shell 1 along with the annular columnar structure, and the convex shaft 351 moves along the second oblique groove 212 toward the linear groove 211, and is guided by the second oblique groove 212 to make the limit strip 2034 disengage from the retreat groove 2032, and the limit strip 2034 is 4 squeezes the inner wall of the fire hose 4 to prop up the inside of the fire hose 4. The fire hose 4 has a certain elasticity. Under the action of its own rebound force, the end of the fire hose 4 is covered on the annular columnar structure. At this time, the finger pressing the tail of the annular columnar structure can be removed, and the end of the fire hose 4 will enter the tail end of the outer shell 1 along with the annular columnar structure. The staff only needs to press with their fingers at the starting stage when the fire hose 4 enters the tail end of the outer shell 1, which improves the convenience of the staff to install the joint.

[0033] Working principle: insert the end of the fire hose 4 into the rear end of the outer shell 1. As the end of the fire hose 4 is inserted, the rear end of the inner tube 2 is also inserted into the end of the fire hose 4 until the fire hose 4 cannot move into the rear end of the outer shell 1. At this time, the worm 305 is screwed with a hexagonal wrench to rotate the worm wheel 304 together with the sleeve 303. The rotation direction is downward. Figure 3The middle arrow indicates the direction. As the sleeve 303 rotates, the three groups of pins 3013 will slide along the corresponding first oblique grooves 312. Under the guidance of the first oblique grooves 312, the pins 3013 drive the sliders 3012 to move along the guide pillars 3014 toward the center of the fixed disk 301. At the same time, the three groups of sliders 3012 drive the three groups of arc-shaped clamping plates 302 to move toward each other until the rubber pads 306 on the arc-shaped clamping plates 302 are squeezed onto the fire hose 4. At this time, the three groups of arc-shaped clamping plates 302 are combined into a group of hollow columns, so that the end of the fire hose 4 is tightly wrapped on the tail end of the inner tube 2, so as to realize the installation of the joint.

[0034] When a softer fire hose 4 is selected, the sleeve 303 is first driven to rotate in the same direction as the lower attached hose. Figure 3 The middle arrow indicates the opposite direction, so that the three sets of pin shafts 3013 slide along the corresponding first arc groove 311. The setting of the first arc groove 311 will not make the three sets of pin shafts 3013 move toward the center of the fixed plate 301. At the same time, the other ends of the two sets of L-shaped rods 206 slide along the corresponding spiral groove 321. Under the guidance of the spiral groove 321, the two sets of L-shaped rods 206 together with the two sets of extension strips 203 move toward the direction of the fire hose 4. The two sets of extension strips 203 drive the fixing ring 2 04 together with the rest of the extension strips 203, so that several groups of extension strips 203 extend to the outside of the rear end of the outer shell 1, so that several groups of extension strips 203 form a group of annular columnar structures outside the rear end of the outer shell 1. At this time, the user sets the end of the fire hose 4 on the annular columnar structure, and then presses the tail of the annular structure with fingers to pre-fix the end of the fire hose 4 on the annular structure. With the other hand, the worm 305 is screwed with a wrench to make the sleeve 303 move along the lower attachment Figure 3 Rotate in the direction indicated by the middle arrow, so that the annular column structure begins to retract into the rear end of the outer shell 1, and at the same time, the hand holding the rear end of the annular column structure moves synchronously with the annular column structure, so that the end of the fire hose 4 enters into the rear end of the outer shell 1, and at the same time, the fire hose 4 is sleeved on one end of the tube body 201, until the other end of the L-shaped rod 206 slides to the intersection of the spiral groove 321 and the second arc groove 322, at this time, the pin 3013 is located at the intersection of the first arc groove 311 and the first oblique groove 312, as the sleeve 303 continues to rotate, the other end of the L-shaped rod 206 slides along the second arc groove 322, and the second arc groove 322 is set so that the annular column structure will not continue to move, and the pin 3013 will slide along the first oblique groove 312, so as to achieve the above-mentioned tight wrapping of the end of the fire hose 4 around the rear end of the inner tube 2;

[0035] When the annular columnar structure comes out from the rear end of the outer shell 1, the plate 2031 slides along the guide groove 202, and at the same time, the two ends of the convex shaft 351 slide along the two groups of linear grooves 211 respectively. When the convex shaft 351 slides into the second oblique groove 212, under the guidance of the second oblique groove 212, the convex shaft 351 drives the linkage plate 2035 together with the four groups of movable blocks 2033 and the four groups of limit strips 2034 to move toward the central axis of the outer shell 1, so that the four groups of limit strips 2034 respectively enter the four groups of retreat grooves 2032 on the plate 2031, so that the outer diameter of the annular columnar structure composed of the four groups of extension strips 203 becomes smaller. At this time, the inner diameter of the selected fire hose 4 is equal to the annular columnar structure with a smaller outer diameter, and the fire hose 4 is put on the annular columnar structure, and then Use your fingers to press the tail of the annular columnar structure so that the end of the fire hose 4 is pre-fixed on the annular columnar structure. Use your other hand to screw the worm 305 with a wrench to move the end of the fire hose 4 toward the tail end of the outer shell 1 along with the annular columnar structure. At the same time, the convex shaft 351 moves along the second oblique groove 212 toward the linear groove 211, and is guided by the second oblique groove 212 to disengage the limit strip 2034 from the retreat groove 2032. At the same time, the limit strip 2034 squeezes the inner wall of the fire hose 4 so that the inside of the fire hose 4 is propped up. The fire hose 4 has a certain elasticity. Under the action of its own rebound force, the end of the fire hose 4 is covered on the annular columnar structure. At this time, the finger pressing the tail of the annular columnar structure can be removed, and the end of the fire hose 4 will enter the tail end of the outer shell 1 along the annular columnar structure.

[0036] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A fire hose connector, comprising an outer shell (1), characterized in that: An inner tube (2) is fixedly installed in the outer shell (1), and a fixing mechanism (3) for fixing a fire hose (4) is provided between the inner tube (2) and the outer shell (1); The fixing mechanism (3) comprises: A fixed plate (301), the fixed plate (301) being installed between the inner tube (2) and the outer shell (1); One side of the fixed disk (301) is provided with three groups of arc-shaped clamping plates (302) distributed at equal angles, and the other side of the fixed disk (301) is in contact with one end surface of a sleeve (303), and the sleeve (303) is rotatably sleeved on the inner tube (2); A worm gear (304) fixedly sleeved on the sleeve (303); a worm (305) meshing with the worm wheel (304), the worm (305) being connected to the outer shell (1); A rubber pad (306) is provided on the inner ring of the arc-shaped clamping plate (302); The fixing plate (301) is provided with three groups of rectangular grooves (3011) at equal angles, a slider (3012) is provided in the rectangular groove (3011), the slider (3012) is plugged into a guide post (3014), the upper end of the guide post (3014) is fixedly connected to the inner wall of the rectangular groove (3011), one end of the three groups of sliders (3012) is respectively fixedly connected to the three groups of arc-shaped clamping plates (302), the other end of the slider (3012) is provided with a pin (3013), two groups of first guide grooves (3031) are provided on one end surface of the sleeve (303), the pin (3013) is located in the first guide groove (3031), and the first guide groove (3031) is composed of a first arc-shaped groove (311) and a first oblique groove (312); The inner tube (2) comprises: A tube body (201), wherein the tube body (201) is fixedly mounted inside the outer shell (1); A plurality of groups of guide grooves (202) are formed at equal angles on one end of the tube body (201); Extension strips (203) are movably installed in the plurality of groups of guide grooves (202), and one end of the plurality of groups of extension strips (203) is fixedly connected to a fixing ring (204); Two groups of avoidance grooves (205) are symmetrically provided in the other end of the tube body (201); An L-shaped rod (206) movably inserted into the avoidance groove (205), one end of two groups of the L-shaped rod (206) being respectively connected to the other end of two groups of extension strips (203); The extension strip (203) comprises: A plate body (2031), wherein the plate body (2031) is slidably connected to the guide groove (202); Four sets of retreat grooves (2032) are provided on the plate body (2031); A movable block (2033) movably inserted into the retreat groove (2032); A limit strip (2034) fixedly connected to one end of the movable block (2033); The other ends of the four groups of limit strips (2034) are fixedly connected to the linkage plate (2035); one end of the plate body (2031) is fixedly connected to the fixing ring (204); the other end of the plate body (2031) is fixedly connected to the L-shaped rod (206); third guide grooves (2021) are provided on both sides of the two groups of guide grooves (202); a convex shaft (351) is provided at one end of the linkage plate (2035); an end of the convex shaft (351) is located in the third guide groove (2021); the third guide groove (2021) is composed of a straight groove (211) and a second oblique groove (212); the linkage plate (2035) is slidably connected to the inner cavity of the plate body (2031); movable grooves (31) are provided on both sides of the other end of the plate body (2031); an end of the convex shaft (351) passes through the movable groove (31) and extends into the third guide groove (2021).

2. A fire hose joint according to claim 1, characterized in that: Two groups of second guide grooves (3032) are provided on the body of the sleeve (303), and the other end of the L-shaped rod (206) is located in the second guide groove (3032).

3. A fire hose joint according to claim 2, characterized in that: The second guiding groove (3032) is composed of a spiral groove (321) and a second arc groove (322).

4. A fire hose joint according to claim 3, characterized in that: The tube body (201) passes through the sleeve (303) and the fixing plate (301); the sleeve (303) is rotatably sleeved on the tube body (201); and the fixing ring (204) fits against one end surface of the tube body (201).

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