On-site repair tool kit and repair methods for fuel oil delivery hoses

Abstract

This invention discloses a field repair tool kit and method for fuel oil delivery hoses, comprising: two stoppers configured to cut off both sides of the section of the hose to be repaired in the direction of fluid flow within the hose; a cutting assembly configured to cut off the section of the hose to be repaired after it has been cut off; and an expander configured to increase the inner diameter of the hose through the cut after the section to be repaired is cut off, for connecting a pipe fitting. This field repair tool kit for fuel oil delivery hoses can quickly cut off the fluid flow within the hose.

Description

Technical Field

[0001] This invention relates to the field of pipeline on-site maintenance technology, and in particular to an on-site maintenance tool kit and maintenance method for fuel oil conveying hoses. Background Technology

[0002] Fuel oil delivery hoses are normally stored in a folded or coiled manner and are unfolded and temporarily laid out on-site for the field or temporary emergency transport of gasoline, diesel, or jet fuel. If the fuel oil delivery hose is damaged or leaking, it must be repaired as soon as possible.

[0003] CN210661898U discloses a mechanical repair device for natural gas pipelines, including a bottom support base. Support legs are welded obliquely to the four outer corners of the bottom support base. Casters are fixed to the bottom of the support legs with screws. A hydraulic cylinder is fixed to the top center of the bottom support base with screws. This invention, by installing this device on both sides of the damaged section of the pipeline, provides vertical support to the bottom of the pipeline through the cooperation of the hydraulic cylinder, support top base, movable support plate, and arc-shaped rubber pad. A rectangular movable groove, movable clamping plate, V-groove, V-shaped rubber pad, piston cylinder, small piston, tension spring, oil storage chamber, oil outlet, and oil hose cooperate to clamp both sides of the pipeline. The mechanical repair device described in the above patent document is not suitable for use at the repair site. Summary of the Invention

[0004] One object of the present invention is to provide a field repair tool kit for fuel oil delivery hoses. Another object of the present invention is to provide a method for repairing fuel oil delivery hoses using the aforementioned field repair tool kit. The entire repair tool kit of the present invention is easy to carry and transport, and easier to operate. Furthermore, the method of the present invention has a short operation time, which can greatly reduce the time spent on preparation work before pipe fitting connection, reducing the potential risks of oil leakage.

[0005] On one hand, the present invention provides a field repair tool kit for fuel oil delivery hoses, comprising:

[0006] Two shut-off devices are configured to cut off both sides of the section of the hose to be serviced in the direction of fluid flow within the hose;

[0007] A cutting assembly configured to cut off the portion of the hose to be repaired after the hose has been shut off; and

[0008] An expander is used to cut off the part of the hose to be repaired and increase the inner diameter of the hose through the cut to connect the fitting.

[0009] The field repair tool kit according to the present invention preferably further includes: an integrated electric hydraulic pump, the integrated electric hydraulic pump comprising: an electric oil pump, the outlet of the electric oil pump being connected to an oil outlet pipe, the oil outlet pipe being configured to provide power to the stop and the expander when using the stop and the expander; an oil bladder; for carrying hydraulic oil and connected to the inlet of the electric oil pump.

[0010] According to the field repair tool kit of the present invention, preferably, the integrated electric hydraulic pump further includes: a backpack, wherein the electric oil pump and the oil bladder are integrated in the backpack, and the outlet of the oil pipe is exposed outside the backpack.

[0011] According to the field repair tool kit of the present invention, preferably, the integrated electro-hydraulic pump is configured to provide a pressure of not less than 60 MPa.

[0012] According to the field repair tool kit of the present invention, preferably, the stopper includes: a clamping mechanism including a first pressure plate assembly and a second pressure plate assembly disposed opposite to each other, forming a clamping space for clamping a hose between the first pressure plate assembly and the second pressure plate assembly; and a first hydraulic drive unit configured to be connected to the oil outlet pipe of the integrated electric hydraulic pump during use, wherein the drive rod of the first hydraulic drive unit is connected to the first pressure plate assembly and drives the first pressure plate assembly to move toward the second pressure plate assembly under the action of the integrated electric hydraulic pump to reduce the clamping space and stop the hose.

[0013] According to the field repair tool kit of the present invention, preferably, the expander includes: at least two expanding components, the outer contour shape of which is adapted to the inner wall shape of the hose; a second hydraulic drive unit, including a hydraulic cylinder and a drive rod reciprocating axially within the hydraulic cylinder, the second hydraulic drive unit being configured to be connected to the oil outlet pipe of the integrated electric hydraulic pump during use; a fixing component, fixedly connected to one end of the hydraulic cylinder in the extension direction of the drive rod, the fixing component being provided with a plurality of track grooves extending radially along the drive rod; and at least two direction conversion components, corresponding one-to-one with the at least two expanding components, each direction conversion component being connected at one end to the drive rod and at the other end to the expanding component, the direction conversion component being configured to convert the axial reciprocating motion of the drive rod into the radial reciprocating motion of the expanding component within the track groove under the action of the integrated electric hydraulic pump, so as to expand the hose by the expanding component.

[0014] According to the field repair tool kit of the present invention, preferably, the cutting component includes: a pad configured to support a hose; and a cutter configured to cut the hose supported on the pad.

[0015] According to the field repair tool kit of the present invention, preferably, the cutter includes: a support; a circular blade disposed on the support, the circular blade being connected to an electric drive unit for driving the circular blade to rotate; and a protective plate, the protective plate having a first slot through which the cutting edge of the circular blade passes, one end of the protective plate being pivotally connected to the support. The protective plate has a first state and a second state. In the first state, the protective plate is configured to rotate toward the side closer to the circular blade so that the cutting edge of the circular blade passes through the first slot for cutting the hose. In the second state, the protective plate is configured to rotate toward the side away from the circular blade to cover the outer side of the cutting edge of the circular blade.

[0016] On the other hand, the present invention also provides a method for repairing a fuel oil delivery hose using the above-mentioned field repair tool kit, the method comprising: using two stoppers to cut off both sides of the part of the hose to be repaired in the direction of fluid flow within the hose; using a cutting assembly to cut off the part of the hose to be repaired; and using an expander to increase the inner diameter of the hose through the cut to connect a pipe fitting.

[0017] According to the method of the present invention, preferably, the step of using two stoppers to cut off the hose on both sides of the part of the hose to be repaired in the direction of fluid flow in the hose includes: cutting off the hose at a position not less than 5 cm away from the part of the hose to be repaired on both sides.

[0018] The on-site repair tool kit for fuel oil delivery hoses of the present invention can quickly shut off the fluid inside the hose, cut the hose, and connect it with a pipe fitting after expanding the hose, thereby minimizing the potential risks of oil leakage. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the on-site maintenance tool kit for a fuel oil delivery hose according to the present invention.

[0020] Figure 2 This is a schematic diagram showing the state in which the stopper of the present invention cuts off the fluid in the hose.

[0021] Figure 3 yes Figure 2 A magnified view of section B in the image.

[0022] Figure 4 This is a schematic diagram of the guide rod of the present invention.

[0023] Figure 5 This is a schematic diagram of the structure of the first pressure plate assembly of the present invention.

[0024] Figure 6 This is a schematic diagram of the mechanism of the second pressure plate assembly of the present invention.

[0025] Figure 7 This is a schematic diagram of the cutting assembly of the present invention cutting the flexible tube.

[0026] Figure 8 This is a schematic diagram of the structure of the protective plate of the present invention.

[0027] Figure 9 This is a schematic diagram of the structure of the expander of the present invention.

[0028] Figure 10 This is a schematic cross-sectional view of the expander portion of the present invention.

[0029] The annotations in the attached figures are explained as follows:

[0030] 1. Integrated electric hydraulic pump;

[0031] 2. Shut-off device; 21. First hydraulic drive unit; 211. Shut-off valve; 212. Shut-off device quick connector; 22. Linear guide rail; 221. Guide rod; 222. Linear bearing; 223. Optical axis fixing seat; 23. Clamping mechanism; 231. First pressure plate assembly; 2311. Flange block; 2312. First pressure plate; 2313. First clamping rod; 232. Second pressure plate assembly; 2321. Second clamping rod; 2322. Second pressure plate; 24. Frame; 241. Support rod; 242. Support plate; 243. Base plate;

[0032] 3. Cutting assembly; 31. Cutter; 311. Power supply unit; 312. Switch button; 313. Bracket; 314. Circular blade; 315. Protective plate; 3151. First slot; 3152. Reset unit; 32. Pad;

[0033] 4. Expander; 41. Second hydraulic drive unit; 411. Expander quick connector; 42. Cylinder rod connector; 43. Slider; 44. Connecting rod; 45. Fixing assembly; 46. Bearing block; 47. Fixing pin. Detailed Implementation

[0034] The present invention will be further described below with reference to specific embodiments, but the scope of protection of the present invention is not limited thereto.

[0035] An exemplary embodiment of the present invention provides a field repair tool kit for a fuel oil delivery hose, comprising an integrated electro-hydraulic pump, two shut-off devices, a cutting assembly, and an expander. The two shut-off devices are configured to cut off both sides of the portion of the hose to be repaired in the direction of fluid flow within the hose. The cutting assembly is configured to cut off the portion of the hose to be repaired after it has been shut off. The expander is configured to increase the inner diameter of the hose through the cut after the portion to be repaired is cut off, in order to connect a pipe fitting. A detailed description follows.

[0036] Integrated electric hydraulic pump

[0037] The integrated electro-hydraulic pump of the present invention may include an electric oil pump and an oil bladder. The outlet of the electric oil pump is connected to an oil outlet pipe configured to power the shut-off and expander when in use. The oil bladder, used to hold hydraulic oil, is connected to the inlet of the electric oil pump. This facilitates the use of the shut-off device of the present invention in situations requiring temporary shut-off of fluid in hoses, such as in the field or outdoor locations, and the use of the expander of the present invention in situations requiring hose expansion.

[0038] In some implementations, the integrated electro-hydraulic pump also includes a backpack, with the electric pump and oil bladder integrated inside the backpack, and the outlet of the oil pipe exposed outside the backpack. This makes the integrated electro-hydraulic pump more portable.

[0039] Furthermore, the integrated electro-hydraulic pump is configured to provide a pressure of at least 60 MPa. This allows the shut-off device to be used with high-pressure delivery hoses, expanding the application range of the shut-off device of this invention.

[0040] Stop

[0041] The shut-off device includes a clamping mechanism and a first hydraulic drive unit. The clamping mechanism includes a first pressure plate assembly and a second pressure plate assembly disposed opposite each other, forming a clamping space between the first and second pressure plate assemblies to clamp the hose. The drive rod of the first hydraulic drive unit is connected to the first pressure plate assembly and configured to drive the first pressure plate assembly towards the second pressure plate assembly to reduce the clamping space and shut off the hose. The shut-off device of this invention can be used to shut off fluid within hoses during maintenance and repair of hoses in oil pumping stations, filtration metering pumping stations, oil and gas treatment, and clean water transportation. It is particularly useful for situations where temporary shut-off of fluid within hoses is required in the field or elsewhere.

[0042] In some embodiments, the first hydraulic drive unit includes a hydraulic cylinder and a drive rod that is axially reciprocating within the hydraulic cylinder. A shut-off valve is provided on the inlet pipe of the hydraulic cylinder, which is used to open and close the inlet pipe.

[0043] When using the shut-off device, open the shut-off valve. The electric oil pump draws oil from the oil sump. The electric oil pump converts the mechanical energy of the motor into the pressure energy of the liquid, allowing the hydraulic oil to enter the hydraulic cylinder of the first hydraulic drive unit through the inlet pipe and shut-off valve. Under the pressure of the hydraulic oil, the hydraulic rod moves, thereby driving the first pressure plate assembly to move towards the second pressure plate assembly to reduce the clamping space and shut off the fluid in the hose. After the fluid in the hose is shut off, close the shut-off valve to prevent hydraulic oil from flowing back from the hydraulic cylinder to the external oil sump, thus maintaining pressure on the hydraulic rod and keeping the fluid in the hose shut off for subsequent operations. The hose described above is, for example, a high-strength polyurethane hose.

[0044] In some embodiments, the inlet of the inlet pipe is provided with a quick-connect stopper for quick connection with the electric oil pump, so as to quickly connect the inlet of the inlet pipe to the electric oil pump and save maintenance time.

[0045] The quick-connector for the stop device is the most convenient plug-and-play connection method. However, it should be noted that the structure of the quick-connector for the stop device is not limited in this invention; other well-known structures in the art can be used. As an example, a spun-type structure can be selected for the quick-connector for the stop device.

[0046] For example, the first pressure plate assembly and the second pressure plate assembly described above can be two separate components. There is no structural connection between them; their only relationship is one of relative positioning during use. When using the shut-off device, the maintenance personnel raise the hose and place the second pressure plate assembly below the hose. Then, they place the first pressure plate assembly along with the first hydraulic drive unit above the hose. The first hydraulic drive unit is then activated, driving the first pressure plate assembly towards the second pressure plate assembly. This reduces the clamping space between the first and second pressure plate assemblies, thereby stopping the fluid flow within the hose.

[0047] As another example, the first and second pressure plate assemblies described above are hinged at one end, making the other end of the first and second pressure plate assemblies an openable connection structure. When using the shut-off device, the maintenance personnel open the openable end of the first and second pressure plate assemblies, raise the hose and place the second pressure plate assembly below the hose, then rotate the first pressure plate assembly along with the first hydraulic drive unit above the hose, and then activate the first hydraulic drive unit to drive the first pressure plate assembly to move towards the second pressure plate assembly, thereby reducing the clamping space between the first and second pressure plate assemblies and thus stopping the fluid flow in the hose.

[0048] Optionally, a locking structure may be provided at the openable end of the first pressure plate assembly and the second pressure plate assembly to prevent the first pressure plate assembly and the second pressure plate assembly from opening when the stopper is not in use, which would be detrimental to the storage of the stopper.

[0049] It is understood that the first pressure plate assembly and the second pressure plate assembly may also be other feasible connection structures, and the present invention does not limit them.

[0050] The stopper of the present invention will be further described below as two separate components, namely the first pressure plate assembly and the second pressure plate assembly.

[0051] In some embodiments, the stopper of the present invention further includes a frame, the frame comprising two or more support rods and a support plate fixedly connected to a first end of each of the two or more support rods. The hydraulic cylinder of the first hydraulic drive unit is fixedly mounted on the support plate, and the support plate has a first through hole through which the drive rod passes and connects to the first pressure plate assembly. The frame ensures the stability of the first hydraulic drive unit during use of the stopper.

[0052] As an example, the frame includes four support rods, one support plate, and two base plates. The first end of each of the four support rods is connected to one of the four corners of the support plate. The second ends of the two support rods on the left and two on the right are connected to the base plates, which are configured to support the second pressure plate assembly. It should be noted that without the force of the first hydraulic drive unit, the first pressure plate assembly is located below the support plate. When the second pressure plate assembly is not placed on the two base plates, the space between the two base plates can provide space for placing flexible hoses.

[0053] When using the shut-off device, place the frame, along with the first pressure plate assembly and the first hydraulic drive unit connected to the frame, above the hose. Then, raise the hose and place the second pressure plate assembly between the two base plates. Next, place the hose on the second pressure plate assembly. Then, activate the first hydraulic drive unit. Under the action of the first hydraulic drive unit, the first pressure plate assembly moves towards the second pressure plate assembly. The first and second pressure plate assemblies tightly clamp the hose between them to achieve the purpose of shutting off the fluid inside the hose.

[0054] Optionally, the first end of each support rod is fixedly connected to the support plate with screws, and the second end of the support rod is connected to the base plate with screws to ensure that the support rod and the support plate have sufficient strength.

[0055] The support rod, support plate, and base plate can be made of metal materials such as stainless steel and carbon steel. The support rod can also be fixedly connected to the support plate and base plate by welding or other connection methods.

[0056] In addition, it should be noted that the first hydraulic drive unit may include multiple drive rods, and correspondingly, the support plate may be provided with multiple first through holes that correspond one-to-one with the multiple drive rods.

[0057] In some embodiments, the support plate is further provided with at least one second through hole. The stopper also includes at least one guide rod, the first end of which is fixedly connected to the first pressure plate assembly, and the second end of which passes through the second through hole, forming a shaft-hole fit between the guide rod and the second through hole. In the above scheme, by providing a guide rod and making the guide rod fit with the shaft hole of the second through hole on the support plate, the movement direction of the drive rod of the first hydraulic drive unit can be ensured, resistance can be reduced, and the shut-off speed of the fluid in the hose can be accelerated.

[0058] As an example, two second through holes are provided on the support plate. The two second through holes are symmetrically arranged around the center of the first through hole. Two guide rods respectively mate with the shaft holes of the two second through holes. When using the stopper of the present invention, after the first hydraulic drive unit is started, the drive rods reciprocate in a direction approximately perpendicular to the first pressure plate assembly under the guidance of the two guide rods.

[0059] Understandably, the length of the guide rod should be greater than the maximum moving distance of the first pressure plate assembly to prevent the guide rod from sliding out of the second through hole.

[0060] Optionally, the guide rod is a column optical axis. The first end of the guide rod is fixedly connected to the first pressure plate assembly via an optical axis fixing seat, and a linear bearing is provided between the second end of the guide rod and the second through hole. Linear bearings have the characteristics of low friction, relative stability, and invariance to bearing speed, enabling high sensitivity and high precision in smooth linear motion. This reduces the sliding friction of the guide rod, further reducing resistance, and also provides a more stable guiding effect for the drive rod. Setting the guide rod as a column optical axis and using an optical axis fixing seat to connect the first pressure plate assembly and the guide rod can also improve the stability between the two. The structure of the optical axis fixing seat and the linear bearing is not limited in this invention; any structure well-known in the art can be used.

[0061] For example, when installing the guide rod, first fix the optical axis mounting base on the support plate with screws, etc., fix the linear bearing in the second through hole, then fix the first end of the guide rod on the optical axis mounting base, and pass the second end of the guide rod through the through hole of the linear bearing.

[0062] In some embodiments, the first pressure plate assembly includes a first pressure plate and at least one first clamping rod disposed along the length of the first pressure plate on the side of the first pressure plate facing the second pressure plate assembly. The side of the first pressure plate facing away from the second pressure plate assembly is connected to a drive rod.

[0063] The first pressure plate is a plate-shaped structure with a large length-to-width ratio. The side of the first pressure plate facing away from the second pressure plate assembly is connected to the drive rod and the guide rod, and the side of the first pressure plate facing the second pressure plate assembly is provided with a first clamping rod. When the first hydraulic drive unit drives the first pressure plate assembly to move towards the second pressure plate assembly, the first clamping rod and the second pressure plate assembly together clamp the hose, thereby stopping the flow of fluid in the hose.

[0064] As an example, the first pressure plate is connected to the drive rod via a flange block. The structure of the flange block is not limited in this invention; any structure well-known in the art can be used.

[0065] In some embodiments, the second pressure plate assembly includes a second pressure plate and at least two second clamping rods disposed along the length of the second pressure plate on the side of the second pressure plate facing the first pressure plate assembly. A gap matching the diameter of the first clamping rod is formed between adjacent second clamping rods. This gap is configured such that when the drive rod moves the first pressure plate assembly toward the second pressure plate assembly to reduce the clamping space, the first clamping rod is at least partially engaged in the gap to cut off fluid within the hose. In some embodiments, the first clamping rod is fully engaged in the gap to cut off fluid within the hose.

[0066] The second pressure plate can also be a plate-shaped structure with a large length-to-width ratio. Its length is roughly the same as that of the first pressure plate, but the width of the second pressure plate can be greater than that of the first pressure plate.

[0067] As an example, a first clamping rod can be set on the first pressure plate, and two second clamping rods can be set on the second pressure plate. Then, one first clamping rod and two second clamping rods constitute the flow-blocking barrier of the hose, ensuring the flow-blocking effect of the stopper to the greatest extent possible.

[0068] It is understood that the number of the first clamping rod and the number of the second clamping rod can be set according to actual needs, and this application does not impose any restrictions on this.

[0069] The shut-off device provided by the exemplary embodiments of the present invention is easy to operate and can quickly cut off the flow. Moreover, the shut-off device of the present invention can be applied to the cutting off of fluid in hoses in various situations.

[0070] Cutting components

[0071] The cutting assembly includes a pad and a cutter, the pad being configured to support a hose; the cutter being configured to cut the hose supported on the pad.

[0072] The cutter includes a bracket on which a circular blade for cutting flexible tubing is mounted. The circular blade is connected to an electric drive unit for rotating it. A protective plate is also attached to the bracket, and the protective plate has a first slot through which the cutting edge of the circular blade passes. One end of the protective plate is pivotally connected to the bracket.

[0073] The protective plate has a first state and a second state. In the first state, the protective plate rotates towards the side closer to the circular blade so that the cutting edge of the circular blade passes through the first slot for cutting the hose. In the second state, the protective plate rotates away from the circular blade to cover the outside of the cutting edge of the circular blade.

[0074] The cutter of this invention can be used to cut hoses in maintenance and repair applications such as oil pumping stations, filter metering pumping stations, oil and gas treatment, and clean water transportation. It is particularly useful for situations where temporary cutting of damaged hoses is required on-site or in the field.

[0075] The circular blade of this invention can be made of stainless steel. Stainless steel has good rust resistance, which makes the circular blade of the cutter of this invention less prone to rusting, easy to store, and suitable for various occasions.

[0076] Because the blade of the circular blade is quite sharp, in order to prevent the blade from scratching maintenance personnel or tearing the storage bag when storing the cutter without affecting its normal use, the cutter of this invention is equipped with a protective plate. The protective plate is pivotally connected to the bracket and is located outside the blade of the circular blade.

[0077] When using the cutter of this invention, the maintenance personnel place the cutter above the hose and press down on the protective plate with slight force. At this time, the protective plate rotates towards the circular blade, and the cutting edge of the circular blade passes through the first groove of the protective plate and contacts the hose. After the maintenance personnel start the electric drive unit, the circular blade rotates at high speed under the action of the electric drive unit to cut the hose.

[0078] After the cutter of this invention cuts the hose, the maintenance personnel remove the cutter from the hose and rotate the protective plate away from the circular blade. At this time, the protective plate is located outside the blade edge of the circular blade, covering the blade edge inside the protective plate. After the maintenance personnel turn off the electric drive unit, the circular blade gradually stops rotating.

[0079] In some embodiments, the protective plate is pivotally connected to the support via a reset unit configured to have a restoring force that tends to rotate the protective plate away from the circular blade.

[0080] When the reset unit is subjected to an external force that compresses it, the reset unit places the protective plate in a first state. When the external force on the reset unit is removed, the reset unit places the protective plate in a second state.

[0081] In the above solution, the protective plate and the bracket are connected by a reset unit, which allows the protective plate to automatically reset to the outside of the blade of the circular blade. This further protects maintenance personnel and prevents them from being cut by the blade of the circular blade when they manually rotate the protective plate.

[0082] As an example, the reset unit is a reset hinge. The reset hinge includes, for example, a first hinge piece, a second hinge piece, a pin, and a torsion spring. The first and second hinge pieces are located on either side of the pin, with the first hinge piece rotatably connected to the pin; the second hinge piece is also rotatably connected to the pin. A torsion spring is fitted onto the pin, with its two ends abutting against the first and second hinge pieces, respectively.

[0083] The first and second hinge pieces have mounting holes and are connected to the protective plate and bracket respectively by screws. When an external force is applied to the hinges, causing the first and second hinge pieces to rotate relative to each other, the included angle between the first and second hinge pieces gradually decreases, thereby compressing the torsion spring and causing it to deform. When the external force is removed, the elastic force of the torsion spring acts on the first and second hinge pieces, forcing them to return to their original positions. It should be noted that the structure of the hinge resetting mechanism is not limited in this invention, and other structures well-known in the art that can achieve automatic resetting can also be used.

[0084] In some embodiments, the protective plate includes, from one end to the other along its length, a connecting section, a slotted section, and a guide section.

[0085] The connecting section is pivotally connected to the bracket via a reset unit, and the slotted section has a first strip groove; the guide section has an inclination angle that is inclined toward the direction of the circular blade.

[0086] The aforementioned protective plate is a plate-shaped structure with a large length-to-width ratio. The connecting section of the protective plate connects to the first hinge of the reset unit. The slotted section of the protective plate has a first strip-shaped groove to allow the cutting edge of the circular blade to pass through. The guide section of the protective plate has an inclined angle towards the circular blade. By setting the inclined guide section, a funnel-shaped opening is formed between the guide section of the protective plate and the hose in the first state, which facilitates the circular blade to cut the hose, avoids wrinkling of the hose during the cutting process, which is not conducive to cutting the hose, and also prevents the hose from detaching from the cutting edge of the circular blade.

[0087] In some embodiments, the cutter further includes a handheld part connected to a support, the handheld part having a hollow cavity, and an electric drive unit disposed within the hollow cavity.

[0088] In the above design, the handle can be a hollow cylindrical structure, making it easy for maintenance personnel to grip the cutter. A switch button for controlling the opening and closing of the electric drive unit can also be provided on the handle. The switch button can be a push-button or a slide-button.

[0089] In some embodiments, the electric drive unit includes a motor and a worm gear structure. The motor has a motor shaft, one end of the worm gear structure is connected to the motor shaft, and the other end is detachably connected to a circular blade.

[0090] In the above solution, a worm gear structure is used to convert the rotational motion of the motor shaft into the rotational motion of the circular blade. The direction of the rotation axis of the motor shaft is approximately perpendicular to the direction of the rotation axis of the circular blade, making the cutter compact and easy to carry.

[0091] As an example, the worm gear structure includes a worm and a turbine meshing with the worm. The worm gear structure is located in the hollow cavity of the handheld part. The worm of the worm gear structure is connected to the motor shaft. The worm wheel shaft of the worm wheel is fixed to the bracket with a nut. The center position of the worm wheel is positioned by the worm wheel shaft. The circular blade is directly and detachably mounted on the worm wheel.

[0092] In some embodiments, the cutter further includes a power supply unit connected to the electric drive unit. The power supply unit can be located inside or outside the hollow cavity. As an example, the power supply unit is a high-capacity rechargeable battery, or it can be a disposable battery.

[0093] The cutter of the present invention uses a rechargeable battery to power the electric drive unit, which is beneficial for the cutter to work in situations where there is no cable power support, thus expanding the range of applications of the cutter.

[0094] An exemplary embodiment of the present invention also provides a cutting assembly including a pad and a cutter, the pad being configured to support a hose; the cutter being configured to cut the hose supported on the pad.

[0095] When using a cutter to cut hoses, place a pad under the hose to secure the hose on both sides. Hold the cutter's handle so that the circular blade contacts the hose above the pad. During this process, one end of the protective plate rotates upward around the axis of the reset hinge. Start the electric drive unit, and the circular blade rotates at high speed to cut the hose.

[0096] In some embodiments, the pad has a second groove, the depth of which is configured so as not to interfere with the cutting edge of the circular blade when cutting the flexible tube. This protects the cutting edge of the circular blade, prevents it from chipping, and extends the service life of the cutter.

[0097] The pad has a second groove, the depth of which is configured so as not to interfere with the blade of the circular blade when cutting the hose.

[0098] The cutter provided by the exemplary embodiments of the present invention is simple to operate, and the cutter of the present invention can achieve the purpose of quickly cutting the hose while protecting the user.

[0099] expander

[0100] The expander includes at least two expanding components, a second hydraulic drive unit, a fixing component, and at least two direction-changing components. The outer contour shape formed by the at least two expanding components conforms to the inner wall shape of the hose. The second hydraulic drive unit includes a hydraulic cylinder and a drive rod that reciprocates axially within the hydraulic cylinder. The fixing component is fixedly connected to the end of the hydraulic cylinder located in the extension direction of the drive rod, and has multiple track grooves extending radially along the drive rod. Each of the at least two direction-changing components corresponds to one of the at least two expanding components. Each direction-changing component is connected at one end to the drive rod and at the other end to an expanding component. The direction-changing components are configured to convert the axial reciprocating motion of the drive rod into the radial reciprocating motion of the expanding component within the track groove, thereby expanding the hose.

[0101] In the above scheme, by setting a track groove extending in the radial direction on the fixed component, it can be ensured that the entire expander device has only one degree of freedom, and the structure is simple.

[0102] In some embodiments, a shut-off valve is provided on the inlet pipe of the hydraulic cylinder, which is used to open and close the inlet pipe.

[0103] When starting to use the expander, open the shut-off valve. The electric oil pump draws oil from the oil sump, converting the mechanical energy of the electric motor into the pressure energy of the liquid. This allows the hydraulic oil to enter the hydraulic cylinder of the second hydraulic drive unit through the inlet pipe and shut-off valve. Under the pressure of the hydraulic oil, the hydraulic rod extends axially outward. The direction conversion component converts the axial movement of the drive rod into the radial outward movement of the expansion components within the track grooves. The ability of at least two expansion components to move radially outward along the track grooves of the fixed component increases the inner diameter of the hose, thus expanding the hose.

[0104] When the inner diameter of the hose expands to the preset size, close the shut-off valve to prevent hydraulic oil from flowing back from the hydraulic cylinder to the external oil sac, thereby maintaining the pressure on the hydraulic rod. This pressure can be maintained for a suitable period of time to allow the hose to set.

[0105] Once the hose is expanded and shaped, the shut-off valve is opened to allow the hydraulic oil in the hydraulic cylinder to flow back into the oil sac. As the pressure of the hydraulic oil in the hydraulic cylinder gradually decreases, the drive rod retracts axially inward. The direction conversion assembly converts the axial movement of the drive rod into the radial inward movement of the expansion assembly within the track groove. After at least two expansion assemblies have moved inward along the track groove of the fixed assembly, their radial dimension is smaller than the current radial dimension of the hose, facilitating the removal of the expander from the hose for the next step of the operation.

[0106] In some embodiments, the inlet of the inlet pipe is provided with an expander quick-connect fitting for quick connection with the electric oil pump, so as to quickly connect the inlet of the inlet pipe to the electric oil pump and save maintenance time.

[0107] Expander quick-connectors are the most convenient plug-and-play connection method. However, it should be noted that the structure of the expander quick-connector is not limited in this invention; other well-known structures in the art can be used. As an example, a spin-formed structure can be selected for the expander quick-connector.

[0108] In some embodiments, the fixing component includes a first fixing plate and a second fixing plate that are disposed opposite to each other and fixedly connected, both of which are connected to a hydraulic cylinder; corresponding track grooves are provided on the opposing surfaces of the first fixing plate and the second fixing plate.

[0109] The first and second fixed plates can be fixed together by a fixing pin and then fixedly connected to the hydraulic cylinder by a pin shaft. Corresponding track grooves are provided on the opposing surfaces of the first and second fixed plates to ensure that the expansion assembly can only slide along the track grooves, further ensuring that the entire expander assembly has only one degree of freedom.

[0110] In some embodiments, the direction-changing assembly includes a rod connector and a connecting rod. The rod connector is fixedly connected to a drive rod. One end of the connecting rod is hinged to the rod connector, and the other end of the connecting rod is hinged to an expansion assembly.

[0111] For example, the cylinder rod connector is fixedly connected to the drive rod of the second hydraulic drive unit by a stud, and the two ends of the connecting rod are respectively hinged to the cylinder rod connector and the expansion assembly by pins.

[0112] The present invention does not limit the structure of the cylinder rod connector and the connecting rod; any structure well known in the art may be used.

[0113] In some embodiments, the expansion assembly includes a slider and a tile. In some embodiments, there are two expansion assemblies; each expansion assembly includes one slider and one tile. The sliders of the two expansion assemblies are symmetrically arranged, and the tiles of the two expansion assemblies are symmetrically arranged. A first end of the slider is hinged to a connecting rod, and a second end of the slider is slidably connected to a track groove. The tile is connected to the outer side of the slider, and the outer surface of the tile is an arc surface. It is understood that the higher the degree of matching between the arc-shaped outer surface of the tile and the inner wall of the hose, the better the expansion effect. In some embodiments, the tile is a semi-circular tile. Furthermore, to improve the expansion effect, for hoses with larger diameters, multiple expansion assemblies can be provided as needed.

[0114] In some implementations, the tile has multiple weight-reducing through holes.

[0115] In some embodiments, the length dimension of the slider matches the length dimension of the tile. Multiple connecting rods are spaced apart along the length direction.

[0116] In the above scheme, the dimensions of the slider in the length direction are matched with the dimensions of the tile in the length direction, and multiple connecting rods are set to connect the slider and the tile, which can improve the uniformity of the force on the tile and improve the expansion effect.

[0117] In some embodiments, the second hydraulic drive unit further includes a reset unit, one end of which is connected to the drive rod and the other end of which is connected to the hydraulic cylinder. The reset unit is configured to have a restoring force that tends to move the drive rod toward the inlet pipe of the hydraulic cylinder.

[0118] A reset unit is installed between the hydraulic cylinder and the drive rod. During the process of the drive rod moving outward along the axis to expand the hose, the reset unit extends and stores energy. After the expansion and forming are completed, the electric oil pump is turned off, the driving force of the drive rod is released, the reset unit releases energy, and under the assistance of the restoring force of the reset unit, the drive rod moves inward along the axis, accelerating the reset of the drive rod.

[0119] The reset unit can be made of a resilient material. As an example, the reset unit is a return spring.

[0120] In some embodiments, the second hydraulic drive unit further includes a rod stroke limiting structure disposed within the hydraulic cylinder and configured to limit the distance of the drive rod reciprocating in the axial direction within a preset range.

[0121] For example, the drive rod includes a piston rod and a piston connected to one end of the piston rod. The cylinder rod stroke limiting structure is a cylinder rod stroke limiting block. The cylinder rod stroke limiting block is set in the hydraulic cylinder at a certain distance from the hydraulic cylinder inlet. When the piston moves to the cylinder rod stroke limiting block under the action of hydraulic oil, it is blocked by the cylinder rod stroke limiting block, thereby achieving the purpose of limiting the distance of the drive rod reciprocating in the axial direction within a preset range.

[0122] Understandably, the distance between the location of the cylinder rod stroke limit block and the hydraulic cylinder inlet should match the length of the track groove set on the fixed component.

[0123] As an example, the cylinder rod stroke limiting block has a ring-shaped structure.

[0124] It should be noted that the structure of the cylinder rod stroke limiting structure is not limited in this invention, and other structures well known in the art can also be used.

[0125] The expander provided by the exemplary embodiments of the present invention is simple to operate and expands quickly, and the expander of the present invention can be applied to various situations where the size of the hose needs to be increased.

[0126] Repair methods

[0127] The present invention provides a method for repairing fuel oil delivery hoses using the aforementioned on-site repair tool kit, comprising: using two stoppers to cut off both sides of the section of the hose to be repaired in the direction of fluid flow within the hose; after the hose is cut off, using a cutting assembly to cut off the section of the hose to be repaired; and after the section of the hose to be repaired is cut off, using an expander to increase the inner diameter of the hose through the cut to connect the pipe fitting. The specific process of using the stoppers, cutting assembly, and expander for repair is as described above and will not be repeated here.

[0128] Example 1

[0129] Figure 1 This is a schematic diagram of the on-site maintenance tool kit for a fuel oil delivery hose according to the present invention. Figure 2 This is a schematic diagram of the state in which the stopper 2 of the present invention cuts off the fluid in the hose. Figure 3 yes Figure 2 A magnified view of section B in the image. Figure 4 This is a schematic diagram of the structure of the guide rod 221 of the present invention. Figure 5 This is a schematic diagram of the structure of the first pressure plate assembly 231 of the present invention. Figure 6 This is a schematic diagram of the mechanism of the second pressure plate assembly 232 of the present invention. Figure 7 This is a schematic diagram of the cutting assembly of the present invention cutting a flexible tube. Figure 8 This is a schematic diagram of the structure of the protective plate of the present invention. Figure 9 This is a schematic diagram of the structure of an expander according to the present invention. Figure 10 This is a schematic cross-sectional view of an expander section of the present invention.

[0130] like Figure 1 As shown, the field repair tool kit for fuel oil delivery hoses includes an integrated electric hydraulic pump 1, a stopper 2, a cutting assembly 3, and an expander 4. There can be two or more stoppers 2.

[0131] like Figure 2 As shown, the stop device 2 includes a frame 24, a clamping mechanism 23, and a first hydraulic drive unit 21. The clamping mechanism 23 includes a first pressure plate assembly 231 and a second pressure plate assembly 232 disposed opposite to each other, forming a clamping space for clamping the hose between the first pressure plate assembly 231 and the second pressure plate assembly 232. The first hydraulic drive unit 21 includes a hydraulic cylinder and a drive rod that can reciprocate axially within the hydraulic cylinder. A stop valve 211 is provided on the inlet pipe of the hydraulic cylinder, which is used to open and close the inlet pipe. A quick-connect fitting 212 for quick connection with an electric oil pump is provided at the inlet of the inlet pipe, so as to quickly connect the inlet of the inlet pipe to the electric oil pump and save maintenance time.

[0132] like Figure 2-3As shown, the drive rod of the first hydraulic drive unit 21 is connected to the first pressure plate assembly 231 and is configured to drive the first pressure plate assembly 231 to move toward the second pressure plate assembly 232 to reduce the clamping space and cut off the hose.

[0133] The frame 24 includes four support rods 241, one support plate 242, and two base plates 243. The first end of each of the four support rods 241 is connected to one of the four corners of the support plate 242. Figure 2 As shown, the second ends of the two support rods 241 on the left and the two support rods 241 on the right are connected to the base plate 243 respectively, and the two base plates 243 are configured to support the second pressure plate assembly 232.

[0134] The support plate 242 has a first through hole. The drive rod of the first hydraulic drive unit 21 passes through the first through hole and connects to the first pressure plate assembly 231. The support plate 242 also has two second through holes.

[0135] like Figure 4 As shown, the shut-off device 2 also includes two guide rods 221. The first end of the guide rod 221 is fixedly connected to the first pressure plate assembly 231, and the second end of the guide rod 221 passes through the second through hole, forming a shaft hole fit between the guide rod 221 and the second through hole. In the above scheme, by setting the guide rod 221 and making the guide rod 221 fit with the shaft hole of the second through hole on the support plate 242, the movement direction of the drive rod of the first hydraulic drive unit 21 can be ensured, the resistance can be reduced, and the shut-off speed of the fluid in the hose can be accelerated.

[0136] The guide rod 221 is a column optical axis. The first end of the guide rod 221 is fixedly connected to the first pressure plate assembly 231 through the optical axis fixing seat 223. A linear bearing 222 is provided between the second end of the guide rod 221 and the second through hole.

[0137] The guide rod 221, the linear bearing 222, and the optical axis fixing seat 223 constitute the linear guide rail 22 of the first hydraulic drive unit 21.

[0138] like Figure 5 As shown, the first pressure plate assembly 231 includes a first pressure plate 2312 and at least one first clamping rod 2313 disposed along the length extension direction of the first pressure plate 2312 on the side of the first pressure plate 2312 facing the second pressure plate assembly 232. The side of the first pressure plate 2312 facing away from the second pressure plate assembly 232 is connected to a drive rod.

[0139] The first pressure plate 2312 is a plate-shaped structure with a large length-to-width ratio. The side of the first pressure plate 2312 facing away from the second pressure plate assembly 232 is connected to the drive rod and guide rod 221. A first clamping rod 2313 is provided on the side of the first pressure plate 2312 facing the second pressure plate assembly 232. When the first hydraulic drive unit 21 drives the first pressure plate assembly 231 to move towards the second pressure plate assembly 232, the first clamping rod 2313 and the second pressure plate assembly 232 together clamp the hose, thereby stopping the fluid flow within the hose. (Refer to...) Figure 3 As shown.

[0140] As an example, the first pressure plate 2312 is connected to the drive rod via a flange block 2311. The present invention does not limit the structure of the flange block 2311; any structure well-known in the art can be used.

[0141] In some implementations, such as Figure 6 As shown, the second pressure plate assembly 232 includes a second pressure plate 2322 and at least two second clamping rods 2321 disposed along the length of the second pressure plate 2322 on the side of the second pressure plate 2322 facing the first pressure plate assembly 231. A gap matching the diameter of the first clamping rod 2313 is formed between adjacent second clamping rods 2321. When the drive rod drives the first pressure plate assembly 231 towards the second pressure plate assembly 232 to reduce the clamping space, the first clamping rod 2313 is at least partially embedded in the fluid within the gap-stopping hose.

[0142] like Figure 7 As shown, the cutting assembly 3 includes a pad 32 and a cutter 31. The pad 32 is configured to support the hose, and the cutter 31 is configured to cut the hose supported on the pad 32.

[0143] Among them, such as Figure 7 As shown, the cutter 31 includes a bracket 313, on which a circular blade 314 for cutting flexible tubing is mounted. The circular blade 314 is connected to an electric drive unit for rotating the blade. A protective plate 315 is also connected to the bracket 313. The protective plate 315 has a first slot 3151 through which the cutting edge of the circular blade 314 passes. One end of the protective plate 315 is pivotally connected to the bracket 313. The protective plate 315 has a first state and a second state.

[0144] In the first state, the protective plate 315 rotates toward the side closer to the circular blade 314 so that the cutting edge of the circular blade 314 passes through the first strip groove 3151 for cutting the hose; in the second state, the protective plate 315 rotates toward the side away from the circular blade 314 to cover the outside of the cutting edge of the circular blade 314.

[0145] like Figure 8As shown, the protective plate 315 is pivotally connected to the bracket 313 via a reset unit 3152. The reset unit 3152 is configured to have a restoring force that tends to rotate the protective plate 315 away from the circular blade 314. Specifically, when the reset unit 3152 is subjected to an external force that compresses the reset unit 3152, the protective plate 315 is in a first state; when the external force on the reset unit 3152 is removed, the protective plate 315 is in a second state.

[0146] The reset unit 3152 is a reset hinge. The reset hinge includes, for example, a first hinge piece, a second hinge piece, a pin, and a torsion spring. The first and second hinge pieces are located on either side of the pin, with the first hinge piece rotatably connected to the pin; the second hinge piece is also rotatably connected to the pin. A torsion spring is fitted onto the pin, with its two ends abutting against the first and second hinge pieces, respectively.

[0147] The first and second hinge pieces are provided with mounting holes, which are connected to the protective plate 315 and the bracket 313, respectively. When an external force is applied to the hinges, causing the first and second hinge pieces to rotate relative to each other, the included angle between the first and second hinge pieces gradually decreases, thereby compressing the torsion spring and causing it to deform. When the external force is removed, the elastic force of the torsion spring acts on the first and second hinge pieces, forcing them to return to their original positions. The structure is simple and easy to use. It should be noted that the present invention does not limit the structure of the hinge that can return to its original position; other structures well known in the art that can achieve automatic return function can also be used.

[0148] The protective plate 315 includes a connecting section, a slotted section and a guide section in sequence from one end to the other along its length.

[0149] The connecting section is pivotally connected to the bracket 313 via the reset unit 3152; the slotted section has a first strip groove 3151; the guiding section has an inclination angle that slopes toward the circular blade 314, as shown in the reference section. Figure 8 As shown.

[0150] The cutter 31 also includes a handle, which is connected to the bracket 313. The handle has a hollow cavity, and the electric drive unit is disposed within the hollow cavity. The handle can be a hollow cylindrical structure, making it easy for maintenance personnel to hold the cutter 31. A switch button 312 for controlling the opening and closing of the electric drive unit can also be provided on the handle. The switch button 312 can be a push-button or a slide-button.

[0151] The electric drive unit includes a motor and a worm gear structure. The motor has a motor shaft, one end of the worm gear structure is connected to the motor shaft, and the other end is detachably connected to the circular blade 314.

[0152] The cutter 31 also includes a power supply unit 311, which is connected to the electric drive unit and is disposed within the hollow cavity. As an example, the power supply unit 311 is a rechargeable battery.

[0153] The pad 32 has a second groove, the depth of which is configured to prevent interference with the cutting edge of the circular blade 314 when cutting the flexible tube. This protects the cutting edge of the circular blade 314, prevents it from becoming blunt, and extends the service life of the cutter 31.

[0154] like Figure 9 and Figure 10 As shown, the expander 4 includes two symmetrically arranged expansion components, a second hydraulic drive unit 41, a fixing component 45, and two direction conversion components. The outer contour shape formed by the two expansion components conforms to the inner wall shape of the hose. The second hydraulic drive unit 41 includes a hydraulic cylinder and a drive rod that reciprocates axially within the hydraulic cylinder. The fixing component 45 is fixedly connected to the end of the hydraulic cylinder located in the extension direction of the drive rod, and has multiple track grooves extending radially along the drive rod. The two direction conversion components correspond one-to-one with the two expansion components. Each direction conversion component is connected at one end to the drive rod and at the other end to an expansion component. The direction conversion components are configured to convert the axial reciprocating motion of the drive rod into the radial reciprocating motion of the expansion component within the track groove, thereby expanding the hose.

[0155] The inlet of the inlet pipe is equipped with an expander quick-connect fitting 411 for quick connection with the electric oil pump, so as to quickly connect the inlet of the inlet pipe to the electric oil pump and save maintenance time.

[0156] The fixing component 45 includes a first fixing plate and a second fixing plate that are disposed opposite to each other and fixedly connected. Both the first fixing plate and the second fixing plate are connected to a hydraulic cylinder. Track grooves are correspondingly provided on the opposing surfaces of the first fixing plate and the second fixing plate.

[0157] In this embodiment, the first fixing plate and the second fixing plate can be fixed together by fixing pin 47 and fixedly connected to the hydraulic cylinder by pin shaft. Corresponding track grooves are provided on the opposing surfaces of the first fixing plate and the second fixing plate, which can ensure that the expansion component can only slide along the track groove, and further ensure that the entire expander 4 device has only one degree of freedom.

[0158] In some embodiments, the direction-changing assembly includes a rod connector 42 and three connecting rods 44. The rod connector 42 is fixedly connected to a drive rod. One end of each connecting rod 44 is hinged to the rod connector 42, and the other end is hinged to an expansion assembly.

[0159] For example, the cylinder rod connector 42 is fixedly connected to the drive rod of the second hydraulic drive unit 41 by a stud, and the two ends of the connecting rod 44 are respectively hinged to the cylinder rod connector 42 and the expansion assembly by pins.

[0160] Each expansion assembly includes a slider 43 and a tile 46. The sliders 43 and tiles 46 of the two expansion assemblies are symmetrically arranged. The first end of the slider 43 is hinged to a connecting rod 44, and the second end of the slider 43 is slidably connected to a track groove. The tile 46 is connected to the outer side of the slider 43, and the outer surface of the tile 46 is an arc surface. It is understood that the higher the degree of matching between the arc-shaped outer surface of the tile 46 and the inner wall of the hose, the better the expansion effect. Furthermore, to improve the expansion effect, multiple expansion assemblies can be set for hoses with larger diameters, depending on actual needs.

[0161] Multiple weight-reducing through holes are provided on tile 46.

[0162] The second hydraulic drive unit 41 also includes a reset unit. One end of the reset unit is connected to the drive rod, and the other end is connected to the hydraulic cylinder. The reset unit is configured to have a restoring force that tends to move the drive rod toward the inlet pipe of the hydraulic cylinder. The second hydraulic drive unit 41 also includes a cylinder rod stroke limiting structure, which is disposed inside the hydraulic cylinder and configured to limit the distance of the drive rod's reciprocating motion in the axial direction within a preset range.

[0163] Example 2

[0164] This embodiment provides a repair method for a fuel oil delivery hose, using the field repair tool kit described in Embodiment 1. The repair method includes:

[0165] Two shut-off devices are used to cut off the flow of fluid in the hose on both sides of the part of the hose to be repaired in the direction of fluid flow.

[0166] After the hose is shut off, the section of the hose to be repaired is cut off using a cutting assembly; and

[0167] After the section of the hose to be repaired is cut off, an expander is used to increase the inner diameter of the hose through the cut to connect the fitting.

[0168] The repair method steps are described in detail below:

[0169] When a fuel oil delivery hose leaks, bring the repair tool kit to the leak site in one go. Place the frame 24, along with the first pressure plate assembly 231 and the first hydraulic drive unit 21 connected to the frame 24, above the side of the hose at least 5 cm away from the leak. Then, raise the hose and place the second pressure plate assembly 232 between the two base plates 243. Place the hose on the second pressure plate assembly 232, and then connect the first hydraulic drive unit 21 to the leak site using the quick-connect fitting 212. Figure 1 The integrated electric hydraulic pump 1 shown is connected. When the shut-off valve 211 is opened and the integrated electric hydraulic pump 1 is started, the first pressure plate assembly 231 moves towards the second pressure plate assembly 232 under the action of the first hydraulic drive unit 21. The first clamping rod 2313 of the first pressure plate assembly 231 and the second clamping rod 2321 of the second pressure plate assembly 232 tightly clamp the hose between them, thus stopping the fluid inside the hose. Then, the shut-off valve 211 is closed, and the quick-connect fitting 212 of the shut-off device is disconnected, thus blocking the flow on the other side of the hose leakage point in the same way.

[0170] The maintenance personnel place the pad 32 under the hose and position the cutter 31 above the hose, turn on the switch button 312, and press down on the protective plate 315 with slight force. At this time, the protective plate 315 rotates towards the circular blade 314, and the cutting edge of the circular blade 314 passes through the first slot 3151 of the protective plate 315 and contacts the hose. After the maintenance personnel start the electric drive unit, the circular blade 314 rotates at high speed under the action of the electric drive unit to cut off the leak in the hose.

[0171] After the cutter 31 of this invention cuts the hose, the switch button 312 is turned off. The maintenance personnel remove the cutter 31 from the hose and rotate the protective plate 315 away from the circular blade 314. At this time, the protective plate 315 is located outside the blade of the circular blade 314, covering the blade of the circular blade 314 inside the protective plate 315. After the maintenance personnel turn off the electric drive unit, the circular blade 314 gradually stops rotating.

[0172] Insert the expander 4's pad 46 into one end of the cut hose, connect the integrated electric hydraulic pump 1 to the inlet pipe of the second hydraulic drive unit 41, open the shut-off valve, and the electric oil pump draws oil from the oil sac. The electric oil pump converts the mechanical energy of the motor into the pressure energy of the liquid, allowing the hydraulic oil to enter the hydraulic cylinder of the second hydraulic drive unit 41 through the inlet pipe and shut-off valve. Under the pressure of the hydraulic oil, the hydraulic rod is driven to extend outward axially. The hydraulic rod drives the cylinder rod connector 42 to move linearly away from the hydraulic cylinder. At the same time, under the action of the connecting rod 44, the slider 43 moves linearly outward radially along the track groove of the fixed component 45, so that the pad 46 expands the inner diameter of the hose, achieving the purpose of expanding the hose.

[0173] When the inner diameter of the hose expands to the preset size, close the shut-off valve to prevent hydraulic oil from flowing back from the hydraulic cylinder to the external oil sac, thereby maintaining the pressure on the hydraulic rod. This pressure can be maintained for a suitable period of time to allow the hose to set.

[0174] After the hose is expanded and shaped, the shut-off valve is opened to allow the hydraulic oil in the hydraulic cylinder to flow back into the oil sac. As the pressure of the hydraulic oil in the hydraulic cylinder gradually decreases, the drive rod retracts axially inward. The hydraulic rod drives the cylinder rod connector 42 to move linearly towards the hydraulic cylinder. At the same time, under the action of the connecting rod 44, the slider 43 moves linearly inward along the radial direction along the track groove of the fixed component 45. The radial dimension between the two pads 46 is smaller than the radial dimension of the hose at the current moment, which makes it easier to remove the expander 4 from the hose and insert the pipe connector to connect the hose.

[0175] The preparation work before connecting the aforementioned pipe fittings takes no more than 10 minutes and can be completed by one person. This reduces the potential risk of oil leaks.

[0176] This invention is not limited to the above-described embodiments. Any modifications, improvements, or substitutions that can be conceived by those skilled in the art without departing from the essential content of this invention fall within the scope of this invention.

Claims

1. A field repair tool kit for fuel oil delivery hoses, characterized in that, It includes two stoppers, a cutting assembly, an expander, and an integrated electric hydraulic pump; The two shut-off devices are configured to cut off both sides of the section of the hose to be serviced in the direction of fluid flow within the hose; the shut-off devices include a first pressure plate assembly and a second pressure plate assembly disposed opposite each other, and a first hydraulic drive unit; A clamping space for clamping the hose is formed between the first pressure plate assembly and the second pressure plate assembly; the first hydraulic drive unit is configured to be connected to the oil outlet pipe of the integrated electric hydraulic pump during use, the drive rod of the first hydraulic drive unit is connected to the first pressure plate assembly, and under the action of the integrated electric hydraulic pump, it drives the first pressure plate assembly to move towards the second pressure plate assembly to reduce the clamping space and cut off the fluid in the hose; The first pressure plate assembly includes a first pressure plate and at least one first clamping rod disposed on the side of the first pressure plate facing the second pressure plate assembly along the length extension direction of the first pressure plate; the side of the first pressure plate facing away from the second pressure plate assembly is connected to a drive rod; The second pressure plate assembly includes a second pressure plate and at least two second clamping rods disposed along the length of the second pressure plate on the side of the second pressure plate facing the first pressure plate assembly; there is a gap between two adjacent second clamping rods that matches the diameter of the first clamping rod; the gap is configured such that when the drive rod drives the first pressure plate assembly toward the second pressure plate assembly to reduce the clamping space, the first clamping rod is at least partially embedded in the gap to cut off the fluid in the hose; The cutting assembly is configured to cut off the portion of the hose to be repaired after the hose has been cut off. The cutting assembly includes a pad and a cutter. The pad is configured to support the hose. A second slot is formed on the pad. The cutter includes a bracket with a circular blade for cutting the hose. The circular blade is connected to an electric drive unit for rotating the circular blade. A protective plate is also connected to the bracket. The protective plate includes a connecting section, a slotted section, and a guide section from one end to the other along its length. The connecting section is pivotally connected to the bracket via a reset unit. The slotted section has a first slot through which the cutting edge of the circular blade passes. The guide section has an inclination angle that is inclined toward the circular blade. The expander is configured to cut off the part of the hose to be repaired and increase the inner diameter of the hose through the cut to connect the pipe fitting; the expander includes two expansion components, a second hydraulic drive unit, a fixing component and two direction conversion components; The second hydraulic drive unit includes a hydraulic cylinder and a drive rod that can reciprocate in the axial direction within the hydraulic cylinder. The second hydraulic drive unit is configured to be connected to the oil outlet pipe of the integrated electric hydraulic pump during use. The fixing assembly includes a first fixing plate and a second fixing plate that are disposed opposite to each other and fixedly connected. Both the first fixing plate and the second fixing plate are connected to a hydraulic cylinder. The first fixing plate and the second fixing plate are fixed together by fixing pins and fixedly connected to the hydraulic cylinder by pin shafts. Corresponding track grooves are provided on the opposing surfaces of the first fixing plate and the second fixing plate to ensure that the expansion assembly can only slide along the track grooves. The outer contour shape formed by the two expansion components is adapted to the inner wall shape of the hose; each expansion component includes a slider and a tile; the sliders of the expansion components are symmetrically arranged, and the tiles of the expansion components are symmetrically arranged; one end of the slider is slidably connected to the track groove; the tile is connected to the outside of the slider, and the outer surface of the tile is an arc surface; multiple weight-reducing through holes are provided on the tile; Two direction conversion components correspond one-to-one with the two expansion components. The direction conversion components are configured to convert the axial reciprocating motion of the drive rod into the radial reciprocating motion of the expansion component within the track groove under the action of the integrated electric hydraulic pump, so as to expand the hose of the expansion component. The direction conversion components include a cylinder rod connector and a connecting rod. The cylinder rod connector is fixedly connected to the drive rod of the second hydraulic drive unit. One end of the connecting rod is hinged to the cylinder rod connector, and the other end of the connecting rod is hinged to the other end of the slider.

2. The field repair tool kit according to claim 1, characterized in that, The integrated electric hydraulic pump includes: An electric oil pump, the outlet of which is connected to an oil outlet pipe, the oil outlet pipe Configured to use the cutoff and the expander for the cutoff and the expander The expander provides power; and Oil bladder; used to hold hydraulic oil and connected to the inlet of the electric oil pump.

3. The field repair tool kit according to claim 2, characterized in that, The integrated electric hydraulic pump also includes: The backpack has the electric oil pump and the oil bladder integrated inside, and the outlet of the oil pipe exposed outside the backpack.

4. The field repair tool kit according to claim 2, characterized in that, The integrated electro-hydraulic pump is configured to provide a pressure of not less than 60 MPa.

5. The field repair tool kit according to claim 1, characterized in that, The protective plate has a first state and a second state; In the first state, the protective plate is configured to rotate toward the side closer to the circular blade so that the cutting edge of the circular blade passes through the first strip groove for cutting the hose; In the second state, the protective plate is configured to rotate away from the circular blade to cover the outer side of the blade edge.

6. A method for repairing fuel oil delivery hoses using the field repair tool kit according to any one of claims 1 to 5, characterized in that, include: Two shut-off devices are used to cut off the flow of fluid in the hose on both sides of the part of the hose to be repaired in the direction of fluid flow. The part of the hose to be repaired is cut off using a cutting assembly; and An expander is used to increase the inner diameter of the hose through a cut to connect the fitting.

7. The method according to claim 6, characterized in that, The steps of using two shut-off devices to cut off the flow of fluid within the hose on both sides of the section of the hose to be serviced include: Cut off the hose at a distance of at least 5 centimeters from the part of the hose to be repaired on both sides.

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