Joint expansion device

Abstract

The utility model belongs to the field of fire hose installation equipment, and particularly provides a connector expansion device which comprises a rack, an expansion unit is arranged on the rack, a driving unit is arranged in the rack, an expansion head is arranged in the expansion unit in a matched mode, and the driving unit drives the expansion head to expand in the radial direction and expand a hose connector. The device is simple in structure and convenient to use, a connector and a water hose can be efficiently and rapidly fastened through the device, meanwhile, the device can be directly arranged on a fire-fighting site to be used by firefighters on site, the preparation time of fire-fighting equipment is further shortened, and the fire-fighting work efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the field of fire-fighting water pipe installation equipment and specifically provides a joint expansion and tightening device. Background Art

[0002] Fire hoses are hoses used to transport flame-retardant liquids such as high-pressure water or foam. Traditional fire hoses are lined with rubber and covered with flax woven fabric on the outside. The new generation of fire hoses are made of polymer materials such as polyurethane. There are metal joints at both ends of the fire hose, which can be connected to another hose to extend the distance or connected to a nozzle to increase the liquid injection pressure. Fire hoses can be divided into different types according to the different connection methods of the hose and the hose joint. Internal expansion fire hose (such as forest hose) is a commonly used fire hose, usually used with internal buckle joints.

[0003] The internal expansion fire hose (referred to as the hose) is generally connected to the internal buckle joint through an expansion device installed in the factory before leaving the factory. However, the existing expansion devices, on the one hand, are large in size and complex in structure. They are usually fixed in the factory for use and cannot be moved. On the other hand, due to design reasons, the existing expansion devices also require workers to use pedals, which is complicated to operate and not conducive to quickly completing the connection between the hose and the joint. In actual field practice, the internal expansion fire hose is prone to leakage, disconnection and other problems due to long-term operation in a high-pressure environment. The hose and the joint need to be connected on site. The existing expansion devices cannot meet this demand. Therefore, there is an urgent need for a device with a simple structure, easy operation and the ability to quickly connect the hose and the joint. Utility Model Content

[0004] The utility model provides a joint expansion device, which is particularly suitable for internal expansion fire hoses and can help firefighters quickly complete the connection work between the hose and the joint on site, which is very convenient.

[0005] The technical solution of the utility model is as follows:

[0006] A joint expansion device comprises a frame, an expansion unit is arranged on the frame, a driving unit is arranged in the frame, an expansion head is arranged in the expansion unit, the driving unit is connected with the expansion head by transmission, and the driving unit drives the expansion head to radially expand and expand the water hose joint.

[0007] In this scheme, the water hose and the water hose joint are tightened from the inside of the water hose by an internal expansion method. The device is composed of only a few units, and the firefighters only need to place the water hose and the locking ring of the fire hose and then install the water hose joint on the expansion unit. The driving unit can make the expansion head quickly radially expand the locking ring and firmly abut the water hose against the inside of the water hose joint. Not only can the connection work between the water hose and the joint be completed efficiently and quickly, but the structure of the entire device is also simpler, which is conducive to the smaller size of the entire device. It can be placed in a fire truck for transfer and transportation for on-site use.

[0008] Preferably, the driving unit comprises an oil cylinder, an output end of an oil cylinder shaft of the oil cylinder is transmission-connected to the expansion head, and the oil cylinder is driven by a hydraulic station arranged inside the frame.

[0009] In this solution, the use of a miniaturized hydraulic station can reduce the size of the entire device. At the same time, the hydraulic drive cylinder can also provide sufficient force for the expansion head, so that the expansion head can be extended and retracted through the cylinder to expand the joint.

[0010] Preferably, the expansion unit comprises a mounting ring column, the mounting ring column is arranged on the surface of the frame, the mounting ring column is provided with a slot for buckling the water hose joint, and the center position of the mounting ring column is provided with an expansion hole connected to the inside of the mounting frame.

[0011] This solution is generally applicable to internal expansion type water hose joints, which can be directly buckled on the mounting ring column to avoid displacement of the water hose joint when the subsequent expansion head expands the water hose joint, resulting in the problem of loose expansion.

[0012] Preferably, the expansion head includes an expansion shaft and a spring expansion sleeve mounted on the expansion shaft, the expansion shaft is inserted into the expansion hole, the diameter of the expansion shaft gradually increases, the end with a smaller diameter of the expansion shaft is connected to the cylinder shaft of the oil rod, the oil cylinder is arranged inside the frame, and the cylinder shaft of the oil cylinder, the expansion shaft and the expansion hole are coaxially arranged.

[0013] In this solution, the oil cylinder drives the expansion shaft with changing shaft diameter to perform telescopic movement, and the expansion shaft moves in the direction of the smaller diameter end, so that the diameter of the expansion shaft passing through the locking ring gradually increases, forcing the spring expansion sleeve here to become larger, and finally allowing the spring expansion sleeve to expand the locking ring from the inner diameter of the locking ring to the outside. By expanding the locking ring inside the water hose, the locking ring can press the water hose firmly against the inner wall of the metal water hose joint from the water hose part, thereby achieving the tightening of the water hose and the metal joint. The whole action is efficient and fast.

[0014] Preferably, the spring expansion sleeve includes an expansion cylinder, which is composed of a plurality of circular arrays of expansion blocks. The outer ring of the expansion cylinder is provided with a plurality of spring coils, which provide an inward contraction force. One end of the expansion block is slidably clamped on the mounting ring column. When the spring expansion sleeve is not subjected to external force, the expansion cylinder formed by the expansion blocks is a cylinder with a neat surface, and the expansion shaft slides along the axial direction of the expansion hole to expand or shrink the expansion cylinder.

[0015] In this solution, the maximum diameter of the expansion shaft will not exceed the inner diameter of the hose connector, and the minimum outer diameter of the spring expansion sleeve will not exceed the initial diameter of the locking ring, ensuring that the hose connector can be smoothly buckled on the mounting convex ring and can be smoothly removed after the hose is tightened. One end of the expansion block is slidably connected to the mounting ring column to prevent the expansion tube from moving due to friction when the expansion shaft moves, thereby affecting the tightening effect. After the tightening is completed, the diameter of the expansion shaft becomes smaller, and the expansion tube can be reduced under the action of the spring ring, which is convenient for unloading the hose connector.

[0016] It should be noted that there are many different diameters of fire hoses, and fire hoses of different diameters will be selected according to the occasion and the fire situation. In order to avoid the need to use hoses of different diameters on site, it is necessary to replace the matching components on site and delay time, for this purpose, two tensioning units are included, and the two tensioning units are respectively arranged on both sides of the frame.

[0017] In this solution, the expansion units can be driven by different driving units respectively, and expand different hose joints respectively.

[0018] Preferably, the oil cylinder is a bidirectional oil cylinder, and both ends of the oil cylinder shaft are respectively connected to the expansion heads on both sides of the frame.

[0019] In this solution, the oil cylinder can drive the expansion units at both ends alternately back and forth to perform expansion in time, thereby improving the expansion efficiency.

[0020] Preferably, the expansion heads at both ends of the oil cylinder shaft have different sizes and are respectively adapted to water hose joints of different sizes.

[0021] In this solution, expansion units and expansion heads corresponding to water hoses of different diameters are respectively arranged on both sides of the device, which fully improves the adaptability and reduces the time required for the equipment to replace matching expansion units and expansion heads.

[0022] Preferably, a plurality of sets of induction switches are arranged on the mounting ring column around the axis of the expansion hole, and the induction switches are electrically connected to a control module arranged inside the frame. When the water hose connector contacts the mounting ring column, the induction switches are triggered; when all the induction switches are triggered, the control module receives an electrical signal to activate the hydraulic station.

[0023] In this solution, only when the water hose joint is completely attached to the joint expansion unit can the induction switch be triggered to start the hydraulic pump to work. Multiple induction switches need to be triggered to make the hydraulic pump work, which can ensure that the axis of the water hose joint coincides with the axis of the joint expansion unit, without any area that is not in contact and no gap, effectively reducing the occurrence of safety accidents.

[0024] Preferably, it also includes a battery module, which includes a power plug and a battery. The battery is arranged in the frame for power supply, and the power plug is connected to the battery for external power supply.

[0025] Beneficial effects of the utility model:

[0026] 1. The utility model has a simple structure and is easy to use. Non-production workers such as firefighters can also use this device to efficiently and quickly fasten joints and hoses. Therefore, the utility model can also be set at the fire scene to reduce the preparation time of fire equipment and further improve the efficiency of firefighting work.

[0027] 2. The utility model is generally provided with two tightening stations, and the tightening heads in the tightening units arranged at the two stations can be respectively adapted to water hose joints of different calibers. The two tightening heads can be driven to work by one oil cylinder. The simple setting improves the adaptability, avoids the need to replace the matching tightening units and tightening heads of the equipment, and wastes time, thereby delaying the fire-fighting opportunity. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solution of the present invention, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a three-dimensional structural diagram of the utility model;

[0030] Figure 2 It is a three-dimensional structural diagram of another embodiment of the utility model;

[0031] Figure 3 It is an enlarged stereoscopic diagram of the expansion unit of the utility model;

[0032] Figure 4 It is a cross-sectional view of the expansion head of the utility model;

[0033] Figure 5 This is a working cross-sectional view of an expansion head in another embodiment of the utility model.

[0034] In the above drawings, the corresponding reference numerals are as follows:

[0035] 1-frame, 11-expansion unit, 111-mounting ring column, 112-slot, 12-drive unit, 121-cylinder, 122-cylinder shaft, 123-hydraulic station, 124-coupling joint, 13-expansion head, 131-expansion shaft, 132-spring expansion sleeve, 1321-expansion cylinder, 1322-spring ring, 14-induction switch, 2-water hose, 21-water hose joint, 22-locking ring, 23-waterproof ring. DETAILED DESCRIPTION

[0036] In conjunction with the accompanying drawings, the technical solution of the present invention is clearly and completely described through the specific implementation methods of the embodiments of the present invention.

[0037] Embodiment 1:

[0038] like Figure 1 and Figure 3 As shown, this embodiment provides a single-axis joint expansion device, including a frame 1, on which an expansion unit 11 is arranged, and a driving unit 12 is arranged in the frame 1. An expansion head 13 is arranged in the expansion unit 11, and the driving unit 12 is transmission-connected with the expansion head 13, and the driving unit drives the expansion head 13 to radially expand and expand the water hose joint 21.

[0039] Specifically, Figure 4 As shown, the water hose 2 and the water hose joint 21 are fastened from the inside of the water hose 2 by an internal expansion method. The firefighters only need to place the water hose 2 and the locking ring 22 and then install the water hose joint 21 on the expansion unit 11. The device can enable the expansion head 13 to quickly expand the locking ring 22, and firmly abut the water hose 2 against the inside of the water hose joint 21, which is efficient and quick.

[0040] It should be noted that the device is particularly suitable for internal expansion fire hoses, such as forest fire hoses, because the device uses an internal expansion method to install and tighten the joint. The inner wall of the hose joint 21 is provided with a latching tooth at the contact part with the hose 2, which can prevent the hose 2 from falling off when tightened. The locking ring 22 is a thin copper sleeve, and the end of the locking ring 22 and the end of the hose 2 should also be padded with a waterproof ring 23, generally a rubber ring. After the locking ring 22 expands, the locking ring 22 firmly abuts the hose 2 against the inner wall of the hose joint 21, and the waterproof ring 23 is squeezed at the port to further prevent water leakage.

[0041] Furthermore, a battery module is provided in the frame 1 , and the driving unit 12 includes a cylinder 121 , an output end of a cylinder shaft 122 of the cylinder 121 is transmission-connected to the expansion head 13 , and the cylinder 121 is driven by a hydraulic station 123 provided inside the frame 1 .

[0042] The oil cylinder 121 in this embodiment can use a thin-walled oil cylinder 121, an axial oil cylinder 121, etc., and the pump station is a miniaturized pump station composed of a hydraulic pump and a motor. The use of a miniaturized hydraulic station 123 can reduce the volume of the entire device. At the same time, the hydraulically driven oil cylinder 121 can also provide sufficient force for the tightening head 13. The oil cylinder shaft 122 is connected to the tightening shaft 131 through the coupling joint 124, so that the tightening head 13 can be extended and retracted through the oil cylinder 121 to expand the joint.

[0043] Furthermore, it also includes a battery module, the battery module includes a power plug and a battery, the battery is arranged in the frame 1 for power supply, the power plug is connected to the battery for external power supply. The battery module includes a power plug and a small battery, when the external power supply cannot be connected, the small battery is used to power the device, when the external mains power is available, the power plug can be used to connect the power to the device, and the small battery can be charged at the same time.

[0044] Furthermore, the expansion unit 11 includes a mounting ring column 111, which is arranged on the surface of the frame 1, and is provided with a slot 112 for buckling the water hose connector 21, and a center position of the mounting ring column 111 is provided with an expansion hole connected to the inside of the mounting frame.

[0045] Specifically, the mounting ring column 111 in the present embodiment is generally suitable for an expansion type water hose joint 21, and the water hose joint 21 can be directly buckled on the mounting ring column 111 to prevent the water hose joint 21 from being displaced due to force when the subsequent expansion head 13 expands the water hose joint 21, resulting in the problem of loose expansion. When a water hose joint 21 with other structures is used, different mounting ring columns 111 can be replaced according to the type of joint. For example, a threaded interface can be used, and a corresponding thread can be set on the mounting ring column 111. Other methods will not be repeated here.

[0046] Furthermore, the expansion head 13 includes an expansion shaft 131 and a spring expansion sleeve 132 sleeved on the expansion shaft 131, the expansion shaft 131 is inserted into the expansion hole, the axial diameter of the expansion shaft 131 gradually increases, the end of the expansion shaft 131 with a smaller axial diameter is connected to the cylinder shaft 122 of the oil rod, the cylinder 121 is arranged inside the frame 1, and the cylinder shaft 122 of the cylinder 121, the expansion shaft 131 and the expansion hole are coaxially arranged.

[0047] Specifically, the oil cylinder 121 drives the expansion shaft 131 with a changing shaft diameter to perform telescopic movement, and the expansion shaft 131 moves in the direction of the smaller diameter end, so that the shaft diameter of the expansion shaft 131 passing through the locking ring 22 gradually increases, forcing the spring expansion sleeve 132 here to become larger, and finally allowing the spring expansion sleeve 132 to expand the locking ring 22 from the inner diameter of the locking ring 22 to the outside, and by expanding the locking ring 22 inside the water hose 2, the locking ring 22 firmly presses the water hose 2 against the inner wall of the metal water hose joint 21 from the water hose 2, thereby achieving the tightening of the water hose 2 and the metal joint, and the whole action is efficient and fast.

[0048] Furthermore, the spring expansion sleeve 132 includes an expansion cylinder 1321, which is composed of a plurality of circular arrays of expansion blocks. The outer ring of the expansion cylinder 1321 is provided with a plurality of spring rings 1322. The spring rings 1322 provide an inward contraction force. One end of the expansion block is slidably clamped on the mounting ring column 111. When the spring expansion sleeve 132 is not subjected to external force, the expansion cylinder 1321 enclosed by the expansion blocks is a cylinder with a neat surface. The expansion shaft 131 slides along the axial direction of the expansion hole to expand or shrink the expansion cylinder 1321.

[0049] Specifically, the maximum diameter of the expansion shaft 131 does not exceed the inner diameter of the hose connector 21, and the minimum outer diameter of the spring expansion sleeve 132 does not exceed the initial diameter of the locking ring 22, ensuring that the hose connector 21 can be smoothly buckled on the mounting convex ring and can be smoothly removed after the hose 2 is expanded. One end of the expansion block is slidably connected to the mounting ring column 111 to prevent the expansion cylinder 1321 from moving due to friction when the expansion shaft 131 moves, thereby affecting the expansion effect. After the expansion is completed, the diameter of the expansion shaft 131 becomes smaller, and the expansion cylinder 1321 can be reduced under the action of the spring ring 1322, which is convenient for unloading the hose connector 21.

[0050] The inside of the expansion cylinder 1321 has an inclination, that is, the inside of the expansion cylinder 1321 is a truncated cone through hole, which is convenient for fitting with the surface of the expansion shaft 131. When the moving shaft diameter of the expansion shaft 131 becomes larger, the expansion blocks in the expansion cylinder 1321 can be better stressed and separated from each other, and finally the entire expansion cylinder 1321 becomes larger; at the same time, in order to make the outer surface of the expansion cylinder 1321 better abut against the locking ring 22, a groove for placing the spring ring 1322 is provided on the outer wall of the expansion cylinder 1321.

[0051] Furthermore, the groove length of the slot 112 on the mounting ring column 111 is greater than the clamping head width of the water hose joint 21, so that when the water hose joint 21 is buckled on the mounting ring column 111, the water hose joint 21 can rotate around the axis of the mounting ring column 111.

[0052] Specifically, there may be gaps in some positions after the first tightening. By slightly rotating the water hose joint 21 and then tightening it a second time, the tightness of the connection between the water hose joint 21 and the water hose 2 can be ensured, and it can be ensured that the tightened water hose joint 21 will not leak during operation.

[0053] Embodiment 2:

[0054] Since there are many different diameters of fire hoses, firefighters will choose fire hoses of different diameters according to the occasion and the fire situation. In order to avoid the need to use fire hoses 2 of different diameters on site, it is necessary to replace the matching components on site, which is extremely time-consuming. Therefore, based on the first embodiment, as shown in FIG. Figure 2 As shown, the device comprises two expansion units 11 , and the two expansion units 11 are respectively arranged on both sides of the frame 1 .

[0055] Specifically, the cylinder 121 is a bidirectional cylinder 121, and the two ends of the cylinder shaft 122 are respectively connected to expansion heads 13 of different sizes. The expansion heads 13 at both ends of the cylinder shaft 122 are respectively adapted to water hose joints 21 of different sizes, and the axes of the expansion shafts 131 in the expansion heads 13 at both ends of the cylinder shaft 122 coincide.

[0056] In this solution, expansion units 11 and expansion heads 13 corresponding to water hoses 2 of different diameters are respectively arranged on both sides of the device, which fully improves the adaptability and reduces the time required for replacing matching expansion units 11 and expansion heads 13 of the equipment.

[0057] Further, such as Figure 3 A plurality of sensor switches 14 are arranged on the mounting ring column 111 around the axis of the expansion hole. The sensor switches 14 are electrically connected to a control module arranged inside the frame 1. When the water hose connector 21 contacts the mounting ring column 111, the sensor switches 14 are triggered; when all the sensor switches 14 are triggered, the control module receives an electrical signal to activate the hydraulic station 123.

[0058] Specifically, this setting can also be used in the first embodiment. Only when the hose joint 21 is completely attached to the joint expansion unit 11, can the induction switch 14 be triggered to start the hydraulic pump to work. Multiple induction switches 14 must be triggered to activate the hydraulic pump, which can ensure that the axis of the hose joint 21 coincides with the axis of the joint expansion unit 11, and there is no area that is not in contact, and there is no gap, which effectively reduces the occurrence of safety accidents. Since there are two mounting ring columns 111 in this embodiment, both mounting ring columns 111 are provided with induction switches 14, and the two sets of induction switches 14 complement each other. However, since the bidirectional oil cylinder 121 can only expand and tighten in one direction at the same time, a switching switch can also be set on the frame 1. The switching switch selects which direction the oil cylinder 121 mainly drives to avoid the accidental touch of the other end affecting the expansion effect of the device.

[0059] At the same time in this embodiment, Figure 5 As shown, the expansion shafts 131 at both ends are connected to the same oil cylinder shaft 122. When the oil cylinder 121 controls the expansion shaft 131 at one end to retract the end with a smaller diameter (such as Figure 5 left side), the expansion shaft 131 at the opposite end will extend toward the end with the larger shaft diameter (such as Figure 5 On the right side), the two ends of the cylinder shaft 122 can also be connected to the expansion heads 13 of the same size and specification, so that the joint expansion unit 11 at one end can expand the water hose joint 21, and the other end can be installed and connected in advance with the water hose 2 and the water hose joint 21 that need to be expanded. The expanded water hose joint 21 at one end is unloaded, and the water hose joint 21 at the other end can be expanded. When multiple identical water hoses 2 need to be expanded, this solution can further increase the installation and expansion speed.

[0060] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of protection claimed by the utility model.

Claims

1. A joint expansion device, characterized in that: The invention comprises a frame (1), wherein a tightening unit (11) is arranged on the frame (1), wherein a driving unit (12) is arranged in the frame (1), wherein an tightening head (13) is arranged in the tightening unit (11), wherein the driving unit (12) is transmission-connected to the tightening head (13), and wherein the driving unit drives the tightening head (13) to radially expand and tighten a water hose joint (21).

2. A joint expansion device according to claim 1, characterized in that: The driving unit (12) comprises an oil cylinder (121), the output end of the oil cylinder shaft (122) of the oil cylinder (121) is transmission-connected to the expansion head (13), and the oil cylinder (121) is driven by a hydraulic station (123) arranged inside the frame (1).

3. A joint expansion device according to claim 2, characterized in that: The expansion unit (11) comprises a mounting ring column (111), the mounting ring column (111) being fixedly arranged on the surface of the frame (1), the mounting ring column (111) being provided with a slot (112) for buckling the water hose connector (21), and a expansion hole communicating with the interior of the mounting frame being provided at the center of the mounting ring column (111).

4. A joint expansion device according to claim 3, characterized in that: The expansion head (13) comprises an expansion shaft (131) and a spring expansion sleeve (132) sleeved on the expansion shaft (131); the diameter of the expansion shaft (131) gradually increases; the end of the expansion shaft (131) with a smaller diameter is transmission-connected to the cylinder shaft (122); the cylinder shaft (122) of the cylinder (121), the expansion shaft (131) and the expansion hole are coaxially arranged.

5. A joint expansion device according to claim 4, characterized in that: The spring expansion sleeve (132) includes an expansion tube (1321), which is composed of a plurality of circular arrays of expansion blocks. The outer ring of the expansion tube (1321) is provided with a plurality of spring rings (1322), and the spring rings (1322) provide an inward contraction force, and one end of the expansion block is slidably clamped on the mounting ring column (111).

6. A joint expansion device according to claim 2, characterized in that: It comprises two expansion units (11), and the two expansion units (11) are respectively arranged on two sides of the frame (1).

7. A joint expansion device according to claim 6, characterized in that: The oil cylinder (121) is a bidirectional oil cylinder (121), and the two ends of the oil cylinder shaft (122) are respectively connected to the expansion heads (13) on both sides of the frame (1).

8. A joint expansion device according to claim 7, characterized in that: The expansion heads (13) at both ends of the oil cylinder shaft (122) have different sizes and are respectively adapted to water hose connectors (21) of different sizes.

9. A joint expansion device according to claim 3, characterized in that: A plurality of groups of induction switches (14) are arranged on the mounting ring column (111) around the axis of the expansion hole, and the induction switches (14) are electrically connected to a control module arranged inside the frame (1). When the water hose connector (21) contacts the mounting ring column (111), the induction switches (14) are triggered; when all the induction switches (14) are triggered, the control module receives an electrical signal to activate the hydraulic station (123).

10. A joint expansion device according to claim 1, characterized in that: It also comprises a battery module, the battery module comprising a power plug and a storage battery, the storage battery is arranged in the frame (1) and is used for power supply, and the power plug is connected to the storage battery and is used for external power supply.

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