CN209858350U

CN209858350U - Volume expansion detection device of hose

Info

Publication number: CN209858350U
Application number: CN201920604704.8U
Authority: CN
Inventors: 任文珍; 匡正兵; 刘强; 蔡红璞
Original assignee: BEIJING SANKI PETROLEUM TECHNOLOGY Co Ltd
Current assignee: Sanying United Technology Co ltd
Priority date: 2019-04-28
Filing date: 2019-04-28
Publication date: 2019-12-27
Anticipated expiration: 2029-04-28

Abstract

A volume expansion detection device for a hose comprises a cabinet, wherein a display and an oil metering pipe assembly are arranged on the upper surface of the cabinet, and an electric control device is arranged in the display; the oil measuring pipe assembly comprises a U-shaped pipe and a glass pipe which is serially connected and communicated with the vertical pipe of the U-shaped pipe, and a liquid discharge pipe is communicated between the two vertical pipes of the U-shaped pipe; an oil tank is arranged in the machine cabinet, and a vertical pipeline on one side of the U-shaped pipe opposite to the glass pipe extends downwards and is communicated with the oil tank; a self-sucking pump is arranged on one side of the oil tank; an oil inlet pipe and an oil outlet pipe are arranged above the oil tank, a connector is formed at one end of the oil inlet pipe and one end of the oil outlet pipe, the far free end of the oil inlet pipe is communicated with the output end of the self-priming pump, and the far end of the oil outlet pipe away from the collecting box is communicated with the other opening of the U-shaped pipe; the oil inlet pipe is provided with a first electromagnetic valve, the oil outlet pipe is provided with a second electromagnetic valve, the liquid discharge pipe is provided with a third electromagnetic valve, and the three electromagnetic valves are all electrically connected with the electric control device. The utility model has the advantages that make things convenient for the staff to detect the volume inflation of hose.

Description

Volume expansion detection device of hose

Technical Field

The utility model belongs to the technical field of hose capability test technique and specifically relates to a volume expansion detection device of hose is related to.

Background

Hoses are an important component in modern industry. The material can be set into different materials according to different occasions, and can be widely applied to the industries of machining, oiling machines, automobiles and the like. The expansion amount of the hose is one of important indexes influencing the quality of the hose, and the hose needs to be detected after being processed so as to ensure that the hose conforms to the requirements of OIMLR117 and GB/T9081-2008.

Referring to fig. 1, the conventional volume expansion detection device includes a liquid storage tank, a delivery pipe vertically communicated with a lower surface of the liquid storage tank, a connection pipe communicated with one end of the delivery pipe far away from the liquid storage tank, and an oil metering pipe assembly arranged above the connection pipe, wherein a valve a is mounted on the delivery pipe, and one side of the delivery pipe is connected with a pressure gauge through a pipeline; the connecting pipe is L shape, and its one end communicates with the tip of conveyer pipe, the other end is vertical just to set up to interface down, and the pressure source is installed to the junction of conveyer pipe and connecting pipe, and it can set up to the force (forcing) pump, installs valve B on the horizontal pipeline of connecting pipe.

The oil dip pipe subassembly is including being the U-shaped pipe of back-off form and vertical setting in the liquid reserve tank below, and it passes through the support to be fixed on the plane, and the one end opening of U-shaped pipe is the last interface of the sample that awaits measuring, and the other end opening is the leakage fluid dram with the atmosphere intercommunication, goes up the interface and is located the interface directly over down, is used for installing the hose that awaits measuring between the two. The vertical pipeline department that lies in the interface top on the U-shaped pipe is equipped with cuts the breach, should cut breach department cluster and establish the intercommunication and have the glass pipe, and the glass pipe superscript has the scale. A liquid discharge pipe is communicated between the two vertical pipelines of the U-shaped pipe and is positioned below the glass pipe, a valve C is arranged on the pipeline between the upper connector of the U-shaped pipe and the liquid discharge pipe, and a valve D is arranged on the liquid discharge pipe.

The existing detection comprises the following operation steps:

(1) closing valve A, B, C, D;

(2) injecting a certain amount of oil into the liquid storage tank;

(3) installing a hose to be tested according to requirements;

(4) opening a valve A, B, C to make the oil injected into the delivery pipe, the pressure source, the connecting pipe, the hose and the glass pipe in sequence;

(5) opening part of the valves D until no bubbles exist in the oil in the glass tube, and closing all the valves;

(6) opening a part of valves D, adjusting the liquid level to a proper position, closing the valves D, reading from the glass tube and recording the liquid level as X;

(7) opening valve B, pressurizing by the pressure source, inflating the hose under pressure until the pressure gauge steadily indicates the maximum working pressure at the dispenser (taking the dispenser as an example);

(8) closing the valve B;

(9) opening the valve C, at the moment, gradually recovering the hydraulic pressure in the hose to atmospheric pressure, simultaneously gradually raising the liquid level in the glass tube, and reading and recording the liquid level Y after the liquid level is stable;

(10) obtaining the volume change of the hose through Y-X, and closing the valve C;

(11) repeating (6) - (10) at least twice, and calculating the average value of the volume change as the change of the hose volume under the highest working pressure of the fuel dispenser.

The volume expansion detection device has the following defects:

1. in the process of detecting the normal pressure state and the volume expansion under pressurization, each valve needs to be manually controlled for multiple times, and the operation is complex;

2. the detection length is limited, and if the hose with longer length is detected, the liquid storage tank can be lifted to a certain height, which is very inconvenient;

3. the reading is influenced by factors such as light, levelness when staff observe, oil temperature and the like, the accuracy cannot be guaranteed, and the processing quality of the hose is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a volume inflation detection device of hose, its advantage makes things convenient for the staff to detect the volume inflation of hose, has solved the problem that the operation degree of difficulty is big, the test flow is complicated, easily make mistakes, measuring accuracy is low.

The above technical purpose of the present invention can be achieved by the following technical solutions: a volume expansion detection device for a hose comprises a cabinet which is hollow inside and is provided with an opening at one side, wherein a display and an oil measuring pipe assembly are arranged on the upper surface of the cabinet, and an electric control device is arranged in the display; the oil measuring pipe assembly comprises a U-shaped pipe which is in an inverted buckle shape and is vertically arranged on the upper surface of the machine cabinet, a cut-off notch formed in one vertical pipeline of the U-shaped pipe, and a glass pipe which is serially communicated with the cut-off notch, scales are marked on the glass pipe, and a liquid discharge pipe is communicated between the two vertical pipelines of the U-shaped pipe and below the glass pipe;

an oil tank is arranged in the cabinet and below the oil measuring pipe assembly, and a vertical pipeline on one side of the U-shaped pipe opposite to the glass pipe extends downwards and is communicated with the oil tank; a self-sucking pump communicated with the oil tank is arranged at one side of the oil tank and below the display;

an oil inlet pipe and an oil outlet pipe are arranged above the oil tank, one end of the oil inlet pipe and one end of the oil outlet pipe form interfaces for connecting two ends of a hose to be tested, mounting ports for allowing two ends of the hose to be tested to penetrate through to be connected to the interfaces are formed in the positions, corresponding to the two interfaces, of the side wall of the cabinet respectively, the free end, far away from the oil inlet pipe, is communicated with the output end of the self-priming pump, and one end, far away from the collecting box, of the oil outlet pipe is communicated with an opening, located below;

the oil inlet pipe is provided with a first electromagnetic valve, the oil outlet pipe is provided with a second electromagnetic valve, the liquid discharge pipe is provided with a third electromagnetic valve, and the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve are all electrically connected with the electric control device;

and the oil inlet pipe is positioned on the pipe body between the first electromagnetic valve and the collecting box and is also provided with a pressure sensor electrically connected with the electric control device.

Through above-mentioned technical scheme, during the detection, the both ends of the hose that will await measuring stretch into in the collecting box respectively and be connected with the kneck of oil inlet and oil-out, then open solenoid valve one and solenoid valve two through touch-sensitive screen control electrically controlled device, start the self priming pump, inhale into oil pipe through the filter in proper order with fluid in the oil tank, go out oil pipe, hose and glass pipe await measuring, finally flow back to in the oil tank, after T1 seconds, open solenoid valve three, after T2 seconds again, close solenoid valve one and solenoid valve three, accomplish the exhaust.

The electromagnetic valve III is controlled to be in a small flow rate by the touch screen control electric control device, after T3 seconds, the electromagnetic valve II and the electromagnetic valve III are closed, the liquid level returns to zero, and the liquid level at the moment is recorded as X; then, the touch screen controls the electric control device to open the first electromagnetic valve, the first electromagnetic valve is closed after the self-priming pump is pressurized for T4 seconds, the second electromagnetic valve is opened after T5 seconds, the liquid level at the moment is recorded as Y, and the first detection is completed; the above venting, zeroing and pressurizing test actions are then repeated at least twice, the data is recorded, and the average value of multiple measurements is taken, which can be obtained directly on a display or calculated by itself.

After the detection is finished, the touch screen controls the electric control device to stop the pump, the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve are opened to release pressure, the test hose is detached, and the test is finished.

Detection device in this application, when detecting, only need control each action instruction through the touch-sensitive screen, realized automatic operation, still reduced one control valve simultaneously in the control structure, compare the detection device among the prior art, make things convenient for the staff to detect the volume inflation of hose more, solved the operation degree of difficulty big, test flow complicacy, easily make mistakes, the problem that measuring accuracy is low.

The utility model discloses further set up to: the outside cover of oil pipe measuring subassembly is equipped with the protection casing, correspond on the protection casing the vertical viewing aperture has been seted up to the position of glass pipe.

Through above-mentioned technical scheme, the oil dip pipe subassembly is fragile article, the setting of protection casing for protect the oil dip pipe subassembly.

The utility model discloses further set up to: and a lamp tube is arranged in the protective cover and at one side of the U-shaped tube.

Through the technical scheme, the lamp tube is arranged for providing a light source, so that a worker can conveniently observe the liquid level.

The utility model discloses further set up to: the utility model discloses a light collecting plate, including the viewing aperture, the light collecting plate is installed to the one side that the viewing aperture was kept away from to the protection casing, the light collecting plate is protruding to be established towards the direction of keeping away from the viewing aperture.

Through above-mentioned technical scheme, when opening the fluorescent tube, the light source can improve luminance on the glass pipe through the gathering of solar panel shining to the staff observes or the reading.

The utility model discloses further set up to: and a filter is communicated between the self-priming pump and the oil tank.

Through above-mentioned technical scheme, the setting of filter for filter fluid, prevent that the impurity in the fluid from causing the influence to the testing result.

The utility model discloses further set up to: and an explosion-proof junction box is arranged on the upper surface of the oil tank.

Through above-mentioned technical scheme, the setting of explosion-proof terminal box for improve the security of detection device in the use.

The utility model discloses further set up to: and the upper surface of the oil tank is provided with a temperature sensor electrically connected with the electric control device.

Through above-mentioned technical scheme, temperature sensor's setting for detect the oil temperature, so that the staff heats or cools down oil as required, makes it guarantee throughout at normal temperature, reduces the influence of oil temperature to the detection.

The utility model discloses further set up to: the upper surface of rack is equipped with right the U-shaped pipe carries out the support fixed, the support includes the rigid coupling is in stand, the vertical upwards extension of rack upper surface and vertical rigid coupling are in many horizontal poles and the rigid coupling that just the equidistance set up on the stand body of rod the snap ring at horizontal pole both ends, snap ring keeps away from the confession has been seted up to one side of horizontal pole the breach of U-shaped pipe installation.

Through above-mentioned technical scheme, during the installation, press the pipe wall of U-shaped pipe to the elasticity snap ring in by breach department, at this moment, the elasticity snap ring is propped open to press from both sides tight fixedly to the U-shaped pipe.

To sum up, the utility model discloses a beneficial technological effect does:

1. according to the detection device, during detection, all action instructions are controlled only through the touch screen, automatic operation is achieved, and meanwhile, a control valve is reduced on a control structure, compared with the detection device in the prior art, the detection device is more convenient for workers to detect the volume expansion of the hose, and the problems of high operation difficulty, complex test flow, easiness in error and low test precision are solved;

2. the protective cover is arranged and used for protecting the oil measuring pipe assembly;

3. the lamp tube is used for providing a light source, so that a worker can conveniently observe the liquid level;

4. the filter is arranged and used for filtering the oil liquid and preventing impurities in the oil liquid from influencing a detection result;

5. the explosion-proof junction box is used for improving the safety of the detection device in the using process.

Drawings

FIG. 1 is a schematic diagram of a background art configuration;

fig. 2 is a schematic view of the overall structure of the present invention;

FIG. 3 is a schematic structural view embodying a stent;

FIG. 4 is a schematic view showing the structure of the shield;

fig. 5 is a schematic structural diagram showing the connection relationship of internal components in the cabinet.

In the figure, 1, a cabinet; 11. an installation port; 12. a ceiling door; 13. a handle; 14. a first link; 15. a second link; 2. a display; 3. a dip tube assembly; 31. a U-shaped tube; 32. a glass tube; 33. a liquid discharge pipe; 331. a third electromagnetic valve; 4. a support; 41. a column; 42. a cross bar; 43. an elastic snap ring; 431. a notch; 5. a protective cover; 51. a viewing port; 52. a lamp tube; 53. a light-gathering plate; 6. an oil tank; 61. an explosion-proof junction box; 62. a temperature sensor; 7. a self-priming pump; 71. a filter; 8. a collection box; 81. an oil return pipe; 82. an oil inlet pipe; 821. a first electromagnetic valve; 822. a pressure sensor; 83. an oil outlet pipe; 831. a second electromagnetic valve; 9. and (6) a hose to be tested.

Detailed Description

Referring to fig. 2, for the utility model discloses a volume expansion detection device of hose, including rack 1, its inside cavity and one side are uncovered, and the last surface mounting of rack 1 has display 2 and buret oil pipe subassembly 3, and wherein, display 2's screen is the touch-sensitive screen, installs electrically controlled device in the display 2, and each action of its steerable a whole set of detection device to calculate final measured value according to the formula of setting for.

Referring to fig. 2 and 3, the oil metering pipe assembly 3 includes the U-shaped pipe 31 that is the back-off form and vertical setting, it fixes the top at rack 1 through support 4, specifically do, support 4 includes the stand 41 of rigid coupling in rack 1 upper surface and vertical upwards extension, perpendicular rigid coupling is on the stand 41 body of rod and many horizontal poles 42 that the equidistance set up, and the circlip 43 at rigid coupling horizontal pole 42 both ends, the breach 431 that supplies U-shaped pipe 31 installation is seted up to one side that circlip 43 kept away from horizontal pole 42, during the installation, press the pipe wall of U-shaped pipe 31 to in the circlip 43 by breach 431 department, at this moment, circlip 43 is propped open, and press from both sides tight fixed to U-shaped pipe 31.

Referring to fig. 2, a cut-off gap 431 is provided on one of the vertical pipes of the U-shaped pipe 31, a glass pipe 32 is connected in series with the cut-off gap 431, and scales are marked on the glass pipe 32. An opening of the U-shaped pipe 31 below the glass pipe 32 is an oil inlet, the other opening is an oil outlet, and a liquid discharge pipe 33 is communicated between the two vertical pipelines of the U-shaped pipe 31 and is positioned below the glass pipe 32.

Referring to fig. 4 and 5, the exterior of the metering tube assembly 3 is covered with a protective cover 5 for protecting the metering tube assembly 3. Vertical viewing aperture 51 has been seted up to the position that corresponds glass pipe 32 on the protection casing 5, and fluorescent tube 52 is installed to the position that just is located U-shaped pipe 31 one side in the protection casing 5 for provide the light source, thereby make things convenient for the staff to observe. In order to further improve the brightness of the light at the position of the glass tube 32, a vertically arranged light-gathering plate 53 is installed on the side of the protective cover 5 away from the viewing port 51, and is protruded towards the side away from the viewing port 51, when the lamp tube 52 is opened, the light source can irradiate on the glass tube 32 through the gathering of the light-gathering plate 53, and the brightness of the light is improved.

Referring to fig. 5, an oil tank 6 is installed in the cabinet 1 at a position below the metering tube assembly 3, and an oil discharge port of the U-shaped tube 31 protrudes downward and communicates with the oil tank 6. The upper surface of the oil tank 6 is provided with an explosion-proof junction box 61 for improving the safety of the detection device in the using process. One side of oil tank 6 is equipped with self priming pump 7, and it installs in rack 1 and is located the position of display 2 below, and the intercommunication has filter 71 between self priming pump 7 and the oil tank 6. One side that self priming pump 7 was kept away from to rack 1 and the inner wall department that is located the oil tank 6 top installs collecting box 8, and it is through returning oil pipe 81 and oil tank 6 intercommunication. The lateral wall that the collecting box 8 is close to one side of self priming pump 7 is last to install into oil pipe 82 and go out oil pipe 83, and the one end that advances oil pipe 82 and go out oil pipe 83 stretches into in the collecting box 8 and installs quick plug respectively at this end, makes it form the interface to the staff carries out the dismouting to the hose that awaits measuring. The collecting box 8 is used for collecting oil and enabling the oil to flow back to the oil tank 6 again, oil leakage at the joint of the hose 9 to be detected and the connector is prevented, and in order to avoid accumulation of the oil in the collecting box 8, the bottom wall of the collecting box 8 is set to be closed.

The installing port 11 has been seted up respectively in the position that rack 1 lateral wall corresponds two interfaces, and when the installation hose 9 that awaits measuring, stretch into in the installing port 11 respectively at the both ends of hose 9 that will await measuring to with the interface intercommunication of advancing oil pipe 82 and play oil pipe 83, compare the detection device among the prior art, the hose of the different length of detection device detectable in this application, the length of hose is unrestricted, has improved detection device's practicality.

Referring to fig. 5, a detection port is arranged at the position, corresponding to the collection box 8, on the upper surface of the cabinet 1, and the detection port is hinged with a top plate door 12 through a hinge and is used for protecting the joint of the oil inlet pipe 82, the oil outlet pipe 83 and the hose to be detected. Organic glass is installed on the top plate door 12, and when the top plate door 12 is in a closed state, workers can observe through the organic glass. A handle 13 (see fig. 2) convenient for the operator to operate is fixed on the top plate door 12. The top board door 12 is close to detection mouth one side and is located the face punishment at both ends and be equipped with respectively with two inner wall articulated coupling assembling of collecting box 8, it includes with the first connecting rod 14 of collecting box 8 inner wall articulated, and articulate the second connecting rod 15 between first connecting rod 14 and top board door 12, when the staff overturns top board door 12 through handle 13, receive frictional force's influence between first connecting rod 14 and the second connecting rod 15 to support and spacing top board door 12, prevent that handle 13 and rack 1 from bumping.

The one end that advances oil pipe 82 and keep away from collecting box 8 is linked together with the output of self priming pump 7, and the one end that goes out oil pipe 83 and keep away from collecting box 8 communicates with the oil inlet of U-shaped pipe 31, and when self priming pump 7 started, fluid process filter 71 carried in proper order to advance oil pipe 82, hose 9 that awaits measuring, goes out oil pipe 83, U-shaped pipe 31 and glass pipe 32 in, finally flows back to oil tank 6, realizes the exhaust, and this method is applicable to the hot hose 9 that awaits measuring of any length.

Referring to fig. 5, a first electromagnetic valve 821 is installed on the oil inlet pipe 82 and used for controlling the on-off of the oil inlet pipe 82; the oil outlet pipe 83 is provided with a second electromagnetic valve 831 for controlling the on-off of the oil outlet pipe 83; a third electromagnetic valve 331 is installed on the liquid discharge pipe 33 and used for controlling the on-off of the liquid discharge pipe 33; the first electromagnetic valve 821, the second electromagnetic valve 831 and the third electromagnetic valve 331 are all electrically connected with the electric control device. And a pressure sensor 822 is arranged on the pipe body of the oil inlet pipe 82 between the first electromagnetic valve 821 and the collecting box 8, is electrically connected with the electric control device and is used for detecting the pressure during pressurization and ensuring that the pressurized pressure is the maximum pressure in the working state of the hose.

The upper surface mounting of oil tank 6 has temperature sensor 62, and it is connected with the electricity between the electrically controlled device for detect the oil temperature, so that the staff heats or cools down oil as required, makes it guarantee throughout at normal temperature, reduces the influence of oil temperature to the detection.

The working process is as follows: examine time measuring, stretch into respectively in collecting box 8 and be connected with the kneck of oil inlet and oil-out with the both ends of the hose 9 that awaits measuring, then open solenoid valve 821 and solenoid valve two 831 through touch-sensitive screen control electrically controlled device, start self priming pump 7, inhale into oil pipe 82 through filter 71 with the fluid in the oil tank 6 in proper order, go out oil pipe 83, hose 9 and the glass pipe 32 awaits measuring, finally flow back to in the oil tank 6, after T1 seconds (time is adjustable), open solenoid valve three 331, after T2 seconds (time is adjustable), close solenoid valve 821 and solenoid valve three 331, accomplish the exhaust.

The electromagnetic valve III 331 is adjusted to be in small flow through the touch screen control electric control device, after T3 seconds, the electromagnetic valve II 831 and the electromagnetic valve III 331 are closed, the liquid level returns to zero, and the liquid level at the moment is recorded as X; then, the touch screen controls the electric control device to open the first electromagnetic valve 821, the first electromagnetic valve 821 is closed after the self-priming pump 7 is pressurized for T4 seconds, the second electromagnetic valve 831 is opened after T5 seconds, the liquid level is recorded as Y, and the first detection is completed; the above venting, zeroing and pressurizing test actions are then repeated at least twice, the data are recorded, and the average of the multiple measurements is taken, which can be obtained directly on the display 2 or calculated by itself.

After the detection is finished, the touch screen controls the electric control device to stop the pump, the first electromagnetic valve 821, the second electromagnetic valve 831 and the third electromagnetic valve 331 are opened to release pressure, the test hose is detached, and the test is finished.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. A volume expansion detection device of hose characterized in that: the oil metering device comprises a cabinet (1) which is hollow inside and is provided with an opening at one side, wherein a display (2) and an oil metering pipe assembly (3) are arranged on the upper surface of the cabinet (1), and an electric control device is arranged in the display (2); the oil metering pipe assembly (3) comprises a U-shaped pipe (31) which is in an inverted buckle shape and is vertically arranged on the upper surface of the cabinet (1), a cut-off notch formed in one vertical pipeline of the U-shaped pipe (31), and a glass pipe (32) which is communicated with the cut-off notch in a serial mode, scales are marked on the glass pipe (32), and a liquid discharge pipe (33) is communicated with a position, located below the glass pipe (32), between two vertical pipelines of the U-shaped pipe (31);

an oil tank (6) is installed in the cabinet (1) and below the oil metering pipe assembly (3), and a vertical pipeline on one side of the U-shaped pipe (31) opposite to the glass pipe (32) extends downwards and is communicated with the oil tank (6); a self-priming pump (7) communicated with the oil tank (6) is arranged at one side of the oil tank (6) and below the display (2);

an oil inlet pipe (82) and an oil outlet pipe (83) are arranged above the oil tank (6), one ends of the oil inlet pipe (82) and the oil outlet pipe (83) form interfaces for connecting two ends of a hose (9) to be tested, mounting ports (11) for enabling two ends of the hose (9) to be tested to penetrate through to be connected to the interfaces are respectively formed in the positions, corresponding to the two interfaces, of the side wall of the cabinet (1), the free end, far away from the oil inlet pipe (82), is communicated with the output end of the self-sucking pump (7), and one end, far away from the collecting box (8), of the oil outlet pipe (83) is communicated with an opening, located below the glass tube (32), of the U-shaped tube;

the oil inlet pipe (82) is provided with a first electromagnetic valve (821), the oil outlet pipe (83) is provided with a second electromagnetic valve (831), the liquid discharge pipe (33) is provided with a third electromagnetic valve (331), and the first electromagnetic valve (821), the second electromagnetic valve (831) and the third electromagnetic valve (331) are electrically connected with an electric control device;

and the oil inlet pipe (82) is also provided with a pressure sensor (822) which is electrically connected with the electric control device and is positioned on the pipe body between the first electromagnetic valve (821) and the collecting box (8).

2. The device for detecting the volumetric expansion of a flexible tube according to claim 1, wherein: the outside cover of oil pipe measuring subassembly (3) is equipped with protection casing (5), correspond on protection casing (5) vertical viewing aperture (51) have been seted up to the position of glass pipe (32).

3. A device for detecting the volumetric expansion of a flexible tube according to claim 2, wherein: and a lamp tube (52) is arranged in the protective cover (5) and at one side of the U-shaped tube (31).

4. A device for detecting the volumetric expansion of a flexible tube according to claim 3, wherein: the light-gathering plate (53) of vertical setting is installed to the one side that viewing aperture (51) were kept away from in protection casing (5), light-gathering plate (53) are protruding to be established towards the direction of keeping away from viewing aperture (51).

5. The device for detecting the volumetric expansion of a flexible tube according to claim 1, wherein: and a filter (71) is communicated between the self-priming pump (7) and the oil tank (6).

6. The device for detecting the volumetric expansion of a flexible tube according to claim 1, wherein: and an explosion-proof junction box (61) is mounted on the upper surface of the oil tank (6).

7. The device for detecting the volumetric expansion of a flexible tube according to claim 1, wherein: and a temperature sensor (62) electrically connected with the electric control device is arranged on the upper surface of the oil tank (6).

8. The device for detecting the volumetric expansion of a flexible tube according to claim 1, wherein: the upper surface of rack (1) is equipped with right U-shaped pipe (31) carries out fixed support (4), support (4) are in including the rigid coupling rack (1) upper surface and vertical stand (41), the perpendicular rigid coupling that upwards extends are in many horizontal poles (42) and the rigid coupling that just equidistance set up on the stand (41) the body of rod the circlip (43) at horizontal pole (42) both ends, circlip (43) are kept away from the confession has been seted up to one side of horizontal pole (42) breach (431) of U-shaped pipe (31) installation.