CN108956755A - Detection device and series-parallel detection method in minor diameter spiral heat exchange tube leakage field - Google Patents
Detection device and series-parallel detection method in minor diameter spiral heat exchange tube leakage field Download PDFInfo
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- CN108956755A CN108956755A CN201810554282.8A CN201810554282A CN108956755A CN 108956755 A CN108956755 A CN 108956755A CN 201810554282 A CN201810554282 A CN 201810554282A CN 108956755 A CN108956755 A CN 108956755A
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Abstract
Detection device and series-parallel detection method in minor diameter spiral heat exchange tube leakage field, are related to spiral heat exchange tube leakage field inner detection technique.It is detected to realize in the leakage field to minor diameter spiral heat exchange tube.Described device includes probe driving mechanism and at least one detection probe；Driving mechanism of popping one's head in driving detection probe is in heat exchanger in-pipe；The detection probe includes intermediate connecting body and is sequentially coaxially divided into the magnetizer at intermediate connecting body both ends, steel ball supporter, end connector；Each magnetizer includes armature, magnet and the steel pipe cylinder of all axis settings；Selection connects multiple detection probes in single pipe, and then concatenated detection probe progress is used in parallel by before in more root canals again, while detecting to more root canal roads, thus substantially increases the efficiency of detection, saves time and manpower.
Description
Technical field
The present invention relates to detection device and detection methods in spiral heat exchange tube leakage field, and in particular to a kind of minor diameter spiral is changed
Detection device and series-parallel detection method in the series-parallel leakage field of heat pipe.
Background of invention
In the world today, the energy is the mankind's one of sixty-four dollar question to be faced, the exploitation and conversion of the energy
It is the important topic of All Countries.Heat exchanger is energy using very extensive in departments such as chemical industry, metallurgy, traffic, aeronautics and spaces
One of essential equipment during source utilizes.40% or so equipment is all heat exchanger in oil refining, chemical plant installations, is even more accounted for
The 30%~45% of gross investment is arrived.Heat exchanger not only capital intensive, and the quality of heat exchanger is influence package unit flat
The direct factor of steady operation and Enterprise Integrated economic indicator.
Heat exchanger tube is heat exchange equipment component the most commonly used in petrochemical industry production, is the core of heat exchange equipment
Part, there are commonly heat exchanger tube, waste heat boiler pipes etc..Heat exchanger tube can be divided into heat exchange straight tube and spiral heat exchange tube two major classes,
Compared to heat exchange straight tube, use of the spiral heat exchange tube in heat exchange equipment is relatively late.But spiral heat exchange tube is set for exchanging heat
Standby to have very big advantage: the heat transfer area of such as unit volume is big, structure is more compact, heat transfer efficiency is high, can overcome pipe
Thermal stress etc., spiral tube exchanger makes it in the industrial production by increasingly extensive application with its many advantage.
The safe condition of spiral heat exchange tube has vital influence to production and operation, once it is leaked, gently
It then will appear mixing, influence being normally carried out for production, it is heavy then fire incident can be caused.If spiral heat exchange tube erodes to certain journey
Degree, just will affect the use of heat exchange equipment, need to it be placed under repair and be replaced, if corrosion default cannot be found in time, heat exchange
Pipe will be run with hidden danger, to influence equipment safety, stabilization, long-term operation.But due to spiral heat exchange tube structure shape
Shape causes to its safety detection performance difficulty.
Currently, reached its maturity for the defect detecting technique of heat exchange straight tube and the spiral heat exchange tube of major diameter, but
It is the relevant technologies not yet occur to the safety detection of minor diameter spiral heat exchange tube.
Summary of the invention
The present invention designs detection device and series-parallel detection method in a kind of minor diameter spiral heat exchange tube leakage field, passes through technology
Innovation realizes the minor diameter spiral heat exchange tube defects detection based on leakage method, widens existing checked object range.In other words, originally
The purpose of invention is to provide detection device and series-parallel detection method in a kind of minor diameter spiral heat exchange tube leakage field, to realize to small
Detection in the leakage field of diameter spiral heat exchanger tube.
The technical solution adopted by the present invention to solve the technical problems is:
Detection device in a kind of minor diameter spiral heat exchange tube leakage field, described device include probe driving mechanism and at least one
Detection probe；Probe driving mechanism driving detection probe moves in spiral heat exchange tube；
The detection probe include intermediate connecting body and be sequentially coaxially divided into the magnetizer at intermediate connecting body both ends,
Steel ball supporter, end connector；Positioned at the cable of end the connector one side and probe driving mechanism at detection probe both ends
The straight-through connector of connector (cable connector is mounted on hose cable) is connected, and pops one's head in and driving mechanism of popping one's head in for connecting detection
Hose cable, on the other hand with the cooperation of the armature of magnetizer, for fixing steel ball supporter；
Each steel ball supporter includes that two valve clamping plates and a circle steel ball positioned there between, two valves are used in fixed
Between steel ball clamping plate I and clamping plate II tighten together to form one for accommodating the annular groove of steel ball, steel ball with inside pipe wall for connecing
Touching promotes the transmission of detection probe；Steel ball supporter is connected by the armature of end connector and magnetizer；
Each magnetizer includes armature, magnet and the steel pipe cylinder of all axis settings；Steel pipe cylinder for protect magnet with
And armature, the endface of magnet process a stairstepping, are stuck in its correspondence in the interior stairstepping of steel pipe cylinder, first magnetic
Iron is packed into one end of steel pipe cylinder, then armature is inserted into steel pipe cylinder, and magnet, armature and steel pipe cylinder are positioned by connector
Together, an independent entirety is formed；
The intermediate connecting body is made of magnetic rubber roller and the magnetosensitive detecting element being sleeved on magnetic rubber roller, magnetic
Rubber rollers are for intermediate connection and play the role of magnetic conduction, and intermediate portion is narrower than both ends, for providing magneto sensor and signal
The space of circuit installation；Magnetosensitive detecting element is that difference coil and patch coil are combined while being used；Intermediate connecting body
Connection type with the magnetizer at its both ends is bonding, the magnet of magnetizer and the end face of steel pipe cylinder and magnetic rubber roller
End face bonds together.
Further, probe driving mechanism includes rotary pulsed encoder, cable locators, control cabinet, cable drum, step
Into motor, one group of auxiliary pulley, hose cable；Cable drum is installed on control cabinet, is controlled and is examined by cable drum
The lifting of the hose cable of probing head connection；Cable locators are also mounted on control cabinet, for twining hose cable to cable
On reel；Signal processing computer is used to control the rotation of cable drum for controlling stepper motor, stepper motor；One group of auxiliary
Pulley is installed on control cabinet, and effect is that hose cable is conducting to cable drum and signal processing computer interface
Place, rotary encoder and the tangent installation of cable drum, rotary pulsed encoder are connect with signal processing computer.
Further, when detection probe quantity is multiple (two or more), multiple detection probes are cascaded
With for being placed in a spiral heat exchange tube, multiple detection probes being cascaded are controlled by the probe driving machine
Structure.
Further, when detection probe quantity is multiple (two or more), detection probe is divided into two groups or two groups
More than, every group includes a detection probe or more than one detection probe being cascaded, and each group detection probe corresponds
Ground is placed in each spiral heat exchange tube；Each group detection probe is controlled by the probe driving mechanism.
Further, in the steel ball supporter steel ball material selection GCr9 steel, while clamping plate need and steel ball between
Retain certain clearance for being used to accommodate lubricating oil, to guarantee that steel ball can roll；The material selection 304 of clamping plate I and clamping plate II at
Type stainless steel.
Further, the armature that armature selects MnZn ferrite material to manufacture in the magnetizer, the material of steel pipe cylinder
Select 304 molding stainless steel tubes；Magnet selects the magnet of nd-fe-b magnet manufacture.
Further, the connection type of intermediate connecting body and magnetizer is bonding, carries out sandblasting to the end face of magnet first
Processing, then carries out cleaning dedusting using No. 100 gasoline, next smears heat cure on the end face of magnet and steel pipe cylinder
Adhesive carries out hot press moulding sulfidization molding with magnetic rubber roller.
A kind of series-parallel detection method of minor diameter spiral heat exchange tube leakage field using above-mentioned apparatus, the series-parallel detection side
Method carries out defects detection using interior threading method, and detection probe by the way of mixing in series and parallel, process are as follows:
Series detectors process:
(1) N number of detection probe is serially connected using hose cable, the length of each detection probe is L, in lowest part
The lower section of detection probe connect several steel balls, constitute concatenated detection probe group；By the hose with detection probe group upper end
Cable is wrapped on cable drum, and the rotation of step motor control cable drum, concatenated detection probe group is by bead itself
Under gravity, the bottom end of spiral heat exchange tube is transferred to；
(2) it to behind bottom end, is rotated by cable drum, detection probe group is driven above to mention, above proposing distance every time is L, can be real
Now detect the distance of N × L；
(3) in order to avoid multiple detection probes carry out the same defect to repeat detection, after the distance for above mentioning L at a slow speed,
The distance of (N-1) × L is quickly above proposed, this process is without detection；
(4) the above-mentioned process for above mentioning L at a slow speed, quickly above proposing (N-1) × L distance is then repeated, and so on, until
On mention the upper end of spiral heat exchange tube, complete the detection of a spiral heat exchange tube；
Detection process in parallel:
The bottom end that the concatenated detection probe group of multiple groups is transferred to different spiral heat exchange tubes respectively, by above-mentioned detection probe
Group is wound on cable drum side by side by corresponding hose cable, is guaranteed that every hose cable motion state is synchronous, is repeated
The process for above mentioning L in Series detectors at a slow speed, quickly above proposing (N-1) × L distance can carry out leakage field to more spiral heat exchange tubes simultaneously
The detection mixed in series and parallel is realized in detection.
Further, it is above mentioning in detection process in series and parallel, stepper motor speed can be controlled by computer, control is every
The secondary distance above mentioned；In series-parallel detection process of popping one's head in, each detection probe is connected to an independent signal line output phase and answers
Detection signal give signal processing computer；By computer software analysis, the inverting to detection signal is realized, to realize spiral shell
The positioning and subsequent qualitative and quantitative analysis of rotation heat exchange defective tube.
The invention has the following advantages:
Research object of the present invention is minor diameter spiral heat exchange tube safety detection device, since spiral heat exchange tube is in heat exchanger
There is support in close arrangement in portion, therefore limited by space and lead to not carry out defect inspection outside pipe between Guan Yuguan
It surveys, must be detected using interior threading method, and used Magnetic Flux Leakage Inspecting technology.Leakage field inspection is the most frequently used side of pipeline nondestructive testing
One of method, since it can realize automation, visualization and have high-efficient, high sensitivity, sonde configuration simple, pollution-free etc.
Advantage, so being widely used in fields such as oil-gas pipeline defects detection, steel rail defect detections.The present invention exchanges heat to minor diameter spiral
The detection probe and driving mechanism of pipe leakage magnetic detection device are designed, and to adapt to structure in special pipe, are realized to minor diameter
Detection in the leakage field of spiral heat exchange tube.To improve detection efficiency, time and manpower are saved, by multiple detection probes in single pipe
Series connection, then concatenated multiple groups detection probe progress is used in parallel by before in more root canals again, while exchanging heat to more spirals
Pipe is detected.
Specific beneficial effect shows the following aspects:
1, the intermediate connector of traditional heat exchanger tube leakage magnetic detection device probe is armature, causes detection probe curved
Song, therefore the straight tube that can only exchange heat to major diameter carries out Magnetic Flux Leakage Inspecting, but current spiral tube exchanger is increasing using specific gravity,
Not yet there is the related leakage magnetic detection device to minor diameter spiral heat exchange tube.The present invention will test the intermediate stud connector design of probe
At magnetic rubber roller, the magnetic rubber roller is flexible greatly, bending stiffness is small.Not only had magnetic conduction effect, but also met minimum diameter and be
The minor diameter spiral heat exchange tube of 14mm passes through demand.By designing the detection probe to match, it can be used for diameter 14mm or more
The Magnetic Flux Leakage Inspecting of the spiral heat exchange tube of specification.
2, arrange that steel ball supporter, the steel ball supporter are rolled in spiral heat exchange tube inner wall on the probe of the detection device,
It avoids probe from rubbing with inside pipe wall, detection probe is damaged.Rolling of the another aspect steel ball in spiral heat exchange tube,
Conducive to the traveling of detection probe.Steel ball supporter is fixed by the threaded connection between end connector and armature,
When wear-out failure occurs for steel ball supporter, easy to disassemble and replacement.
3, during implementing Magnetic Flux Leakage Inspecting to minor diameter spiral heat exchange tube, detection probe is gentle in spiral heat exchange tube domestic demand
Advance, and the single spiral heat exchange tube in heat exchanger is generally relatively long, and spiral heat exchange tube substantial amounts, if detection every time
A detection probe is only used, detection efficiency is low.Multiple detection probes are cascaded to be used to be placed on by present invention selection
In one spiral heat exchange tube, one group of concatenated detection probe group is constituted.Then the concatenated detection probe group of multiple groups is placed respectively
In each spiral heat exchange tube, the mode combined in series and parallel is formed, while detecting to more spiral heat exchange tubes, improves detection
Efficiency.
Detailed description of the invention
Fig. 1 is the general illustration of apparatus of the present invention；
Fig. 2 is detection probe schematic diagram in the present invention, and (a) is installation diagram in figure, (b) is exploded view；
Fig. 3 is detection probe end connector schematic diagram in the present invention；
Fig. 4 is detection probe steel ball supporter schematic diagram in the present invention, and (a) is installation diagram in figure, (b) is exploded view；
Fig. 5 is detection probe magnetizer schematic diagram in the present invention, and (a) is installation diagram in figure, (b) is exploded view；
Fig. 6 is detection probe intermediate connecting body schematic diagram in the present invention；
Fig. 7 is driving mechanism schematic diagram in the present invention；
Fig. 8 is detection process schematic diagram in the present invention；
In figure: 1 cable locators, 2 rotary encoders, 3 control cabinets, 4 cable drums, 5 stepper motors, 6 auxiliary pulleys I, 7
Auxiliary pulley II, 8 signal processing computers, 9 hose cables, 10 tested pipelines, 11 detection probes, 1101 end couplings,
1102 clamping plates I, 1103 clamping plates II, 1104 screws, 1105 armature, 1106 magnet, 1107 screws, 1108 steel pipe cylinders, 1109 magnetic
Property rubber rollers, 1110 magnetosensitive detecting elements, 1111 steel balls, 12 weights, 13 upper perforated plates, 14 flanges, 15 bobbin carriages, 16 lower perforated plates, 17
End socket.
Specific embodiment
Detection device mainly includes detection probe and probe driving in minor diameter spiral heat exchange tube leakage field of the present invention
Mechanism.In detection implementation process, detection probe is for realizing minor diameter spiral heat exchange tube excitation and signal acquisition, probe driving
Mechanism guarantees that detection probe at the uniform velocity detects over long distances in spiral heat exchange tube.
Detection probe is by end connector, steel ball supporter, magnetizer and the big portion of intermediate connecting body four in above scheme
It is grouped as.End connector is present in the both ends of detection probe, and there are two effects for it, on the one hand passes through threaded hole and driving device
Cable connector straight-through connector be connected, for connecting detection probe and hose cable, on the other hand by external screw thread and rank
The screw-internal thread fit of iron, for fixing steel ball supporter.
Steel ball supporter is made of two valve clamping plates, a circle steel ball and 4 screws in above scheme.Two valves are used in fixed
Between steel ball clamping plate I and clamping plate II tightened together by 4 screws, a groove profile is formed, for fixed intermediate steel ball, steel ball
Material selection GCr9 steel, while clamping plate need and steel ball between retain certain clearance, after lubricating oil is added dropwise, it is ensured that
Steel ball can be rolled successfully, and the material selection 304 of clamping plate forms stainless steel, and this stainless steel is non-magnetic, wear-resisting, corrosion-resistant,
Still mechanical performance with higher, these parts have collectively constituted the composite junction for being similar to bearing in the case where very thin
Structure: steel ball supporter.On the one hand this structure is played a supporting role, avoid probe from itself rubbing with inside pipe wall, to detection
Probe damages, and the rolling of another aspect steel ball can promote the transmission of detection probe, increases the fluency of detection.Steel ball
Supporter is fixed by the threaded connection between end connector and armature.Using the another of spiral compression mounting means
One advantage is that disassembly is convenient, is conveniently replaceable when through use after a period of time wear-out failure occurs for steel ball supporter.
Magnetizer structure is made of armature, magnet, screw and steel pipe cylinder in above scheme.Armature select magnetic permeability compared with
High MnZn ferrite material, it can convert more uniform Circumferential field for axial magnetic field and import in tube wall, make pipeline
Magnetization is obtained to constitute entire magnetization cycle.The material selection 304 of steel pipe cylinder forms stainless steel tube, due to its excellent machine
Tool performance can provide more spaces under same outer diameter for sensor internal, on the one hand steel pipe cylinder plays protection magnet
And the effect of armature, a raised shape is processed in end, the work of support can also be played together with steel ball supporter
With.Magnet selects high-coercive force rare earth permanent magnetic material nd-fe-b magnet, the endface of magnet is processed a stairstepping, such as
It shown in figure, is stuck in it just in the interior stairstepping of steel pipe cylinder, then armature is inserted into steel pipe cylinder, rotating iron makes it
On threaded hole and the hole on steel pipe cylinder it is coaxial, such magnet, armature and steel pipe cylinder can by screw be located in
Together, they form an independent entirety.Thus, steel pipe cylinder and steel ball supporter protect magnet in the detection process jointly
It is not damaged.
Intermediate connecting body is made of magnetic rubber roller and magnetosensitive detecting element in above scheme, and magnetic rubber roller is for centre
Magnetic conduction is connected and plays the role of, intermediate portion is narrower than both ends, for providing the space of magneto sensor and signal circuit installation.
Magnetosensitive detecting element is that difference coil and patch coil are combined while being used.Since thread mill drilling is very on magnet
Difficulty can also destroy the distribution of the magnetic line of force, influence detection effect even if can process, so intermediate connection in the present invention
The connection type of body and magnetizer is bonding, carries out blasting treatment to the end face of magnet first, is then carried out using No. 100 gasoline
Dedusting is cleaned, heat cure adhesive is next smeared on the end face of magnet and steel pipe cylinder, is carried out with magnetic rubber roller high
Temperature molding sulfidization molding, this connection type is very firm, when workpiece is pullled by powerful external force, even magnetic rubber
Roller is broken, and junction is still able to maintain intact.
Detection probe driving mechanism is by cable locators, rotary pulsed encoder, control cabinet, coil of cable in above scheme
Disk, stepper motor, auxiliary pulley, signal processing computer composition, since spiral tube exchanger is generally what vertical placement used
And bottom head is non-dismountable, probe can only enter from the top of Tube Sheet of Heat Exchanger, so the probe drive device that the present invention designs
Need to be placed in the surface of spiral tube exchanger by bracket.One cable drum is installed on control cabinet, passes through cable
Reel controls the lifting of the hose cable connecting with detection probe.Cable drum structure is simple, and the installation space needed is small, dimension
Shield is convenient, stable and reliable for performance.Cable locators are equally fixed on control cabinet, can guarantee that cable is smoothly twined to cable
On reel, reduces and unexpected probability occurs.Computer-controlled stepper motor, and step motor control cable drum.It is rotary pulsed
Encoder and the tangent installation of cable drum.One group of auxiliary pulley is each attached on control cabinet, and effect is that hose cable is smooth
It is conducting at cable drum and signal processing computer interface.
Using the series-parallel detection method of minor diameter spiral heat exchange tube leakage field of above-mentioned apparatus, the method using interior threading method into
Row defects detection, in order to guarantee that detection probe travel speed is uniform in detection process, and increase across fluency, when detection
By the way of on fast lower slow, several steel balls are connected in the lower section of detection probe, bead can be quick by self gravitation effect
Will test probe and the cable of connection takes spiral heat exchange tube bottom end to, hose cable outer diameter can be than the internal diameter of heat exchanger tube
Much smaller, weight is also relatively lighter, passes through so cable can be relatively easy to, and the process of this decentralization is due to cannot be guaranteed speed
Homogeneity, so in this process and without detection.By computer-controlled stepper motor after to bottom end, detection is above proposed
Probe, carries out Magnetic Flux Leakage Inspecting during upper mention again, to improve the accuracy of detection, smoothly should above mention at a slow speed.Cable
Reel can be controlled the distance that stepper motor above proposes every time to control by computer, be counted simultaneously by step motor control
Calculation machine display can real-time display pop one's head in the distance that is moved in pipeline.In order to position to the defect of detection, arteries and veins will be rotated
Encoder and the tangent installation of cable drum are rushed, the distance that the distance and probe of rotation are mobile has fixed relationship, rotates arteries and veins
It rushes encoder and the distance of rotation can be converted into corresponding electric impulse signal and be input in signal processing computer, then pass through letter
Number processing computer is mapped the electric impulse signal of input with the location information of pipeline, so that it may realize to flaw indication
Positioning.When note abnormalities signal when, for ensure detect accuracy, can to abnormal area carry out repeated detection confirm.
Due to the detection accuracy height that Magnetic Flux Leakage Inspecting requires in above scheme, so detection probe carries out in spiral heat exchange tube
Smoothly to advance at a slow speed when detection, and the single pipe in spiral heat exchanger is generally all long, an entire spiral tube exchanger
The spiral heat exchange tube quantity for being included is even more huge, so if each Magnetic Flux Leakage Inspecting only uses a detection probe, inspection
Degree of testing the speed and efficiency are all very low.Basic solution is proposed in the present invention to this problem: being selected multiple detections
Probe is connected in single pipe, and then concatenated detection probe progress is used in parallel by before in more root canals again, while to more
Root canal road is detected, and is thus substantially increased the efficiency of detection, is saved time and manpower.Assuming that by N number of detection probe
It is all in reinforcement connection using steel wire between every two detection probe, the length of each detection probe is L, first connects the whole series
Detection probe transfer to spiral heat exchange tube bottom end, then above propose carry out Magnetic Flux Leakage Inspecting at a slow speed, above propose the length of L every time, in this way
Disposably just have detected the distance of N × L.In order to avoid multiple detection probes carry out the same defect to repeat detection, upset most
Testing result afterwards, in the distance for above mentioning L at a slow speed and then the quick distance for above mentioning (N-1) × L, this process is without inspection
Survey, the part detected would not be detected repeatedly before in this way, before next repeating above mention at a slow speed L away from
From, quickly above propose process with a distance from (N-1) × L, and so on, such spiral heat exchange tube can have been detected rapidly
At.The concatenated detection probe of multiple groups is wound on cable drum side by side by hose cable, guarantees every cable movement state
It is synchronous, the process for above mentioning L in Series detectors at a slow speed, quickly above proposing (N-1) × L distance is repeated, can be exchanged heat simultaneously to more spirals
Pipe carries out Magnetic Flux Leakage Inspecting, realizes the detection method mixed in series and parallel.In series-parallel detection process of popping one's head in, each detection probe
It is all connected to an independent signal line, is passed into signal processing computer inside hose cable with hose cable.At signal
Reason computer can come the detection signal distinguishing of each detection probe, once find that some detection signal generates fluctuation,
It is determined in conjunction with the location information of rotary pulsed encoder pair detection probe corresponding with fluctuation signal, defect is carried out
Positioning.
Embodiment: the present invention will be further described below with reference to the drawings:
As shown in Figure 1, in this minor diameter spiral heat exchange tube leakage field detection device mainly include include detection probe and spy
Head driving mechanism.In detection implementation process, detection probe is visited for realizing minor diameter spiral heat exchange tube excitation and signal acquisition
Head driving mechanism guarantees that detection probe at the uniform velocity detects over long distances in spiral heat exchange tube.
In conjunction with shown in Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, detection probe designed by the present invention is by end connector, steel ball branch
Support body, magnetizer and the most of composition of intermediate connecting body four.Fig. 3 is end connector structural schematic diagram, and end connector is deposited
It is the both ends of detection probe, there are two effects for it, on the one hand connect by the straight-through of cable connector of threaded hole and driving device
Plug-in unit is connected, and for connecting detection probe and hose cable, on the other hand passes through the screw-internal thread fit of external screw thread and armature, is used for
Fixed steel ball supporter.
It is it is found that the steel ball supporter of detection probe is made of two valve clamping plates, a circle steel ball and 4 screws by Fig. 4.Two
Clamping plate I 1102 and clamping plate II 1103 of the valve for fixed intermediate steel ball are tightened together by 4 screws 1104, form a slot
Type, for fixed intermediate steel ball 1111, the material selection GCr9 steel of steel ball, while clamping plate need to retain between steel ball certain
Clearance, after lubricating oil is added dropwise, it is ensured that steel ball can be rolled successfully, and the material selection 304 of clamping plate forms stainless steel,
This stainless steel is non-magnetic, wear-resisting, corrosion-resistant, and still mechanical performance with higher, these parts are total in the case where very thin
It is same to constitute composite construction for being similar to bearing: steel ball supporter.On the one hand this structure is played a supporting role, avoid visiting
Head itself rubs with inside pipe wall, damages to detection probe, the rolling of another aspect steel ball can promote detection probe
Transmission, increase the fluency of detection.Steel ball supporter is connected by the screw thread between end connector 1101 and armature 1105
Row is tapped into be fixed.Another advantage using spiral compression mounting means is that disassembly is convenient, when steel ball supporter passes through one
The use of section time occurs to be conveniently replaceable when wear-out failure.
As shown in Figure 5, magnetizer structure is made of armature 1105, magnet 1106, screw 1107 and steel pipe cylinder 1108.
Armature 1105 selects the higher MnZn ferrite material of magnetic permeability, it can convert axial magnetic field to more uniform circumferential magnetic
Field imports in tube wall, and pipeline is made to obtain magnetization to constitute entire magnetization cycle.The material selection 304 of steel pipe cylinder 1108 forms
Stainless steel tube can provide more spaces, steel pipe under same outer diameter due to its excellent mechanical performance for sensor internal
On the one hand cylinder plays the role of protecting magnet and armature, process a raised shape in end, acceptable and steel ball
Supporter plays the role of support together.Magnet 1106 selects high-coercive force rare earth permanent magnetic material nd-fe-b magnet, by magnet
Endface processes a stairstepping, as shown, being stuck in it just in the interior stairstepping of steel pipe cylinder 1108, then will
Armature 1106 is inserted into steel pipe cylinder 1108, rotating iron, keeps threaded hole thereon and the hole on steel pipe cylinder coaxial, such magnet
1106, armature 1105 and steel pipe cylinder 1108 can by screw 1107 be positioned together, they form one it is independent
It is whole.Thus, steel pipe cylinder and steel ball supporter protect magnet not to be damaged in the detection process jointly.
Fig. 6 is detection probe intermediate connecting body schematic diagram in the present invention, and 1109 lead in figure to connect and playing for centre
The magnetic rubber roller of magnetic action, the middle section of magnetic rubber roller is narrower than both ends, for providing magneto sensor and signal circuit
The space of installation.1110 be the magnetosensitive detecting element for induction pipe magnetic flux leakage in figure, is by difference coil and patch coil
Combine while using.Since thread mill drilling is very difficult on magnet 1106, even if can process, can also destroy
The distribution of the magnetic line of force, influences experiment effect, so the connection type of intermediate connecting body and magnetizer is bonding in the present invention, first
Blasting treatment is carried out to the end face of magnet 1106, then cleaning dedusting is carried out using No. 100 gasoline, next in magnet and steel
Heat cure adhesive is smeared on the end face of tube cylinder, carries out hot press moulding sulfidization molding with rubber, this connection type is very hard
Gu even magnetic rubber roller 1109 is broken when workpiece is pullled by powerful external force, junction can still be protected
It holds intact.
The overall structure of detection probe driving mechanism designed by the present invention is as shown in fig. 7, due to spiral tube exchanger one
As be vertical to place that use and bottom head is non-dismountable, and probe can only enter from the top of Tube Sheet of Heat Exchanger, so of the invention
The probe drive device of design needs to be placed in the surface of spiral tube exchanger by bracket.One is installed on control cabinet 3
A cable drum 4 controls the lifting for the hose cable 9 connecting with detection probe by cable drum 4.9 structure of cable drum
Simply, the installation space needed is small, easy to maintain, stable and reliable for performance.Cable locators 1 are equally fixed on control cabinet 3,
It can guarantee that cable is smoothly twined onto cable drum, reduce and unexpected probability occurs.Computer 8 controls stepper motor 5, and walks
Cable drum 4 is controlled into motor 5.Rotary pulsed encoder 2 and the tangent installation of cable drum 4.Auxiliary pulley 6 and 7 is each attached to
On control cabinet, effect is smoothly conducting to hose cable at cable drum and signal processing computer interface.
Fig. 8 is detection process schematic diagram of the invention.There is the spiral much closely arranged in one spiral tube exchanger
Heat exchanger tube, but in order to express clearly its detection process, the heat exchanger tube of two reverse acting spirals has only been drawn in figure.The present invention is worn in using
Method carry out defects detection, in order to guarantee that detection probe travel speed is uniform in detection process, and increase across fluency, inspection
When survey by the way of descending on slow fastly, several steel balls 12 are connected in the lower section of detection probe, bead is by self gravitation effect
The cable that probe and connection can quickly be will test takes the bottom end of spiral heat exchange tube to, and hose cable outer diameter can be than heat exchange
The internal diameter of pipe is much smaller, and weight is also relatively light, passes through so cable can be relatively easy to, process of this decentralization is due to cannot
Guarantee the homogeneity of speed, so in this process and without detection.Stepper motor is controlled by computer 8 after to bottom end
5, detection probe is above proposed, carries out Magnetic Flux Leakage Inspecting again during upper mention, it, should at a slow speed smoothly to improve the accuracy of detection
Above mention.Cable drum 4 is controlled by stepper motor 5, can control what stepper motor above mentioned every time to control by computer
Distance, the display of simultaneous computer can real-time display pop one's head in the distance moved in pipeline.In order to be carried out to the defect of detection
Positioning, by rotary pulsed encoder 2 and the tangent installation of cable drum 4, the mobile distance of the distance and probe of rotation exists solid
The distance of rotation can be converted into corresponding electric impulse signal and be input to signal processing by fixed relationship, rotary pulsed encoder 2
In computer 8, then by signal processing computer 8 electric impulse signal of input is mapped with the location information of pipeline, just
The positioning to flaw indication may be implemented.When note abnormalities signal when, for ensure detect accuracy, can to abnormal area into
Row repeated detection is confirmed.
The series connection of detection probe with it is in parallel: since the detection accuracy that Magnetic Flux Leakage Inspecting requires is high, so detection probe is in spiral
Smoothly to advance at a slow speed when being detected in heat exchanger tube, and the single pipe in spiral heat exchanger is generally all long, one is entire
The spiral heat exchange tube quantity that spiral tube exchanger is included is even more huge, so if Magnetic Flux Leakage Inspecting only uses a detection every time
If probe, detects speed and efficiency is all very low.Basic solution is proposed in the present invention to this problem: selection
Multiple detection probes are connected in single pipe, then concatenated detection probe progress parallel connection makes by before in more root canals again
With, while more root canal roads are detected, the efficiency of detection is thus substantially increased, time and manpower are saved.Assuming that by N
It is all in reinforcement connection using steel wire between a detection probe every two detection probe, the length of each detection probe is L, first will
The detection probe that the whole series connect transfers to spiral heat exchange tube bottom end, then above proposes carry out Magnetic Flux Leakage Inspecting at a slow speed, above mentions L's every time
Length disposably just has detected the distance of N × L in this way.In order to avoid multiple detection probes carry out the same defect to repeat inspection
It surveys, upsets last testing result, in the distance for above mentioning L at a slow speed and then the quick distance for above mentioning (N-1) × L, this process
Without detection, the part detected before in this way would not be detected repeatedly, before next repeating at a slow speed
The process for above proposing L distance, quickly above proposing (N-1) × L distance, and so on, such spiral heat exchange tube can be rapid
Detection is completed.The concatenated detection probe of multiple groups is wound on cable drum side by side by hose cable, guarantees every cable fortune
Dynamic state synchronized repeats the process for above mentioning L in Series detectors at a slow speed, quickly above proposing (N-1) × L distance, can be simultaneously to more spiral shells
It revolves heat exchanger tube and carries out Magnetic Flux Leakage Inspecting, realize the detection method mixed in series and parallel.In series-parallel detection process of popping one's head in, each inspection
Probing head is all connected to an independent signal line, is passed into signal processing computer inside hose cable with hose cable.
Signal processing computer can come the detection signal distinguishing of each detection probe, once find that some detection signal generates
Fluctuation, is determined in conjunction with the location information of rotary pulsed encoder pair detection probe corresponding with fluctuation signal, to scarce
It is trapped into capable positioning.
Claims (9)
1. detection device in a kind of minor diameter spiral heat exchange tube leakage field, described device includes probe driving mechanism and at least one inspection
Probing head；Probe driving mechanism driving detection probe moves in spiral heat exchange tube；It is characterized by:
The detection probe includes intermediate connecting body and is sequentially coaxially divided into the magnetizer at intermediate connecting body both ends, steel ball
Supporter, end connector；Positioned at the cable connector of end the connector one side and probe driving mechanism at detection probe both ends
Straight-through connector be connected, for connecting detection pop one's head in pop one's head in driving mechanism hose cable, on the other hand with magnetizer
The cooperation of armature, for fixing steel ball supporter；
Each steel ball supporter includes two valve clamping plates and a circle steel ball positioned there between, and two valves are for fixed intermediate steel
The clamping plate I and clamping plate II of pearl tighten together to form one for accommodating the annular groove of steel ball, and steel ball is for contacting rush with inside pipe wall
Into the transmission of detection probe；Steel ball supporter is connected by the armature of end connector and magnetizer；
Each magnetizer includes armature, magnet and the steel pipe cylinder of all axis settings；Steel pipe cylinder is for protecting magnet and rank
Iron, the endface of magnet process a stairstepping, are stuck in its correspondence in the interior stairstepping of steel pipe cylinder, first magnet cartridge
In the one end for entering steel pipe cylinder, then by armature insertion steel pipe cylinder, magnet, armature and steel pipe cylinder are located in one by connector
It rises, forms an independent entirety；
The intermediate connecting body is made of magnetic rubber roller and the magnetosensitive detecting element being sleeved on magnetic rubber roller, magnetic rubber
Roller is for intermediate connection and plays the role of magnetic conduction, and intermediate portion is narrower than both ends, for providing magneto sensor and signal circuit
The space of installation；Magnetosensitive detecting element is that difference coil and patch coil are combined while being used；Intermediate connecting body and its
The connection type of the magnetizer at both ends is the end face of bonding, the magnet of magnetizer and the end face of steel pipe cylinder and magnetic rubber roller
It bonds together.
2. detection device in a kind of series-parallel leakage field of minor diameter spiral heat exchange tube according to claim 1, it is characterised in that:
Probe driving mechanism include rotary pulsed encoder, cable locators, control cabinet, cable drum, stepper motor, one group it is auxiliary
Help pulley, hose cable；Cable drum is installed on control cabinet, controlled by cable drum connect with detection probe it is soft
The lifting of pipe cable；Cable locators are also mounted on control cabinet, for twining hose cable to cable drum；Signal processing
Computer is used to control the rotation of cable drum for controlling stepper motor, stepper motor；One group of auxiliary pulley is installed in control
On case processed, effect be to be conducting to hose cable at cable drum and signal processing computer interface, rotary encoder with
The tangent installation of cable drum, rotary pulsed encoder are connect with signal processing computer.
3. detection device in a kind of minor diameter spiral heat exchange tube leakage field according to claim 1 or 2, it is characterised in that: inspection
When probing head quantity is multiple, multiple detection probes are cascaded to be used to be placed in a spiral heat exchange tube, multiple strings
The detection probe being linked togather is controlled by the probe driving mechanism.
4. detection device in a kind of minor diameter spiral heat exchange tube leakage field according to claim 1 or 2, it is characterised in that: inspection
Probing head quantity be it is multiple when, detection probe is divided into two groups or more, every group comprising a detection probe or more than one
The detection probe being cascaded, each group detection probe are placed on correspondingly in each spiral heat exchange tube；Each group detection is visited
Head is controlled by the probe driving mechanism.
5. detection device in a kind of minor diameter spiral heat exchange tube leakage field according to claim 1 or 2, it is characterised in that: institute
The material selection GCr9 steel of steel ball in steel ball supporter is stated, while retaining certain receiving that is used between clamping plate needs and steel ball and moistening
The clearance of lubricating oil, to guarantee that steel ball can roll；The material selection 304 of clamping plate I and clamping plate II forms stainless steel.
6. detection device in a kind of minor diameter spiral heat exchange tube leakage field according to claim 5, it is characterised in that: the magnetic
Change the armature that armature in body selects MnZn ferrite material manufacture, the material selection 304 of steel pipe cylinder forms stainless steel tube；Magnet
Select the magnet of nd-fe-b magnet manufacture.
7. detection device in a kind of minor diameter spiral heat exchange tube leakage field according to claim 5, it is characterised in that: centre connects
The connection type of junctor and magnetizer is bonding, carries out blasting treatment to the end face of magnet first, then using No. 100 gasoline into
Row cleaning dedusting, heat cure adhesive is next smeared on the end face of magnet and steel pipe cylinder, is carried out with magnetic rubber roller
Hot press moulding sulfidization molding.
8. a kind of series-parallel detection method of minor diameter spiral heat exchange tube leakage field using claim 1 described device, feature exist
In the series-parallel detection method carries out defects detection using interior threading method, and detection probe by the way of mixing in series and parallel, mistake
Journey are as follows:
Series detectors process:
(1) N number of detection probe is serially connected using hose cable, the length of each detection probe is L, in the inspection of lowest part
The lower section of probing head connects several steel balls, constitutes concatenated detection probe group；By the hose cable with detection probe group upper end
It is wrapped on cable drum, the rotation of step motor control cable drum, concatenated detection probe group is by bead self gravity
Under effect, the bottom end of spiral heat exchange tube is transferred to；
(2) it to behind bottom end, is rotated by cable drum, detection probe group is driven above to mention, above proposing distance every time is L, it can be achieved that inspection
Survey the distance of N × L；
(3) in order to avoid multiple detection probes carry out the same defect to repeat detection, after the distance for above mentioning L at a slow speed, quickly
The distance of (N-1) × L is above proposed, this process is without detection；
(4) the above-mentioned process for above mentioning L at a slow speed, quickly above proposing (N-1) × L distance is then repeated, and so on, until above mentioning
To the upper end of spiral heat exchange tube, the detection of a spiral heat exchange tube is completed；
Detection process in parallel:
The bottom end that the concatenated detection probe group of multiple groups is transferred to different spiral heat exchange tubes respectively, above-mentioned detection probe group is led to
It crosses corresponding hose cable to be wound on cable drum side by side, guarantees that every hose cable motion state is synchronous, repeat to connect
The process for above mentioning L in detection at a slow speed, quickly above proposing (N-1) × L distance can carry out leakage field inspection to more spiral heat exchange tubes simultaneously
It surveys, realizes the detection mixed in series and parallel.
9. a kind of series-parallel detection method of minor diameter spiral heat exchange tube leakage field using claim 8 described device, feature exist
In:
It is above mentioning in detection process in series and parallel, stepper motor speed, the distance that control above proposes every time can be controlled by computer；
In series-parallel detection process of popping one's head in, each detection probe is connected to the corresponding detection signal of independent signal line output
Give signal processing computer；By computer software analysis, the inverting to detection signal is realized, to realize that spiral heat exchange tube lacks
Sunken positioning and subsequent qualitative and quantitative analysis.
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