CN204514296U - A kind of contact pipe inside weld reinforcement measurement mechanism - Google Patents

Abstract

The utility model discloses a kind of contact pipe inside weld reinforcement measurement mechanism, comprise walker, walker is provided with Swing Arm, the swinging support point of Swing Arm is positioned at the circle centre position of tubular workpiece; Swing Arm is provided with displacement transducer, the end of displacement transducer is provided with the roller contacted with tubular workpiece, roller under the drive of Swing Arm along tubular workpiece inner surface movement, when roller contact is protruding to the face of weld on tubular workpiece, the height of roller changes, the reinforcement of face of weld projection is converted to the change of the output signal of displacement transducer, obtain pipe inside weld reinforcement according to the change of the output signal of displacement transducer.Swing Arm can also can control by Non-follow control automatically, can complete corresponding measurement rapidly.Because it adopts the measurement scheme and displacement transducer of demarcating with mother metal, measuring accuracy is high, efficiency is high, and measuring accuracy can be made to reach the features such as 0.01mm.

Description

A kind of contact pipe inside weld reinforcement measurement mechanism

Technical field

The utility model belongs to the field of precision measurement in commercial production, relates to reinforcement and measures, be specifically related to a kind of contact pipe inside weld reinforcement measurement mechanism.

Background technology

Along with the quickening of global industry epoch process, the oil gas energy has become the key point of development of all countries economy.Along with oil gas to deep-sea, desert, south poles and rugged surroundings area exploitation, the reliable and secure transport of oil gas becomes a difficult problem for oil-gas mining.Along with the development of oil and gas industry and the continuous progress of solder technology, the birth of composite bimetal pipe solves this difficult problem of oil gas safe transport under rugged surroundings.Composite bimetal pipe uses more and more extensive in oil gas transport in recent years, and the quality requirements of complex pipe is more and more high.Find that weld reinforcement is comparatively large on the impact of the quality of complex pipe through investigation, therefore measure weld reinforcement exactly and be of great significance.

Specify according to APISPEC5L and GB/T 9711-2011 standard: steel pipe two ends all should be removed apart from the inner and outer welding reinforcement in pipe end at least 150mm length range, in after removing, welding bead exceeds steel tube surface part and should be less than 0.5mm, but can not lower than body.For the measurement of the complex pipe weld reinforcement of high precision level become most important.At present, most manufacturer mainly carries out the measurement of weld reinforcement by artificial hand-held measuring appliance, is difficult to ensure measurement quality, to such an extent as to buries hidden danger of quality to the grinding of weld reinforcement in production and interior pipe compound working procedure, and complex pipe quality is reduced.In addition, there is the problems such as the large and efficiency of serious measuring error, labor strength is low in hand dipping.Current measurement mainly adopts the scheme longitudinally measured along weld seam, and not corresponding with mother metal calibration value, has the large shortcoming of measuring error; Simultaneously can only under particular circumstances to specific workpiece calibration, composite bimetal pipe for minor diameter (people cannot enter) cannot be measured, and has the shortcomings such as bad adaptability, adopts the control of manual/automatic integratedization simultaneously, make equipment have more standby hommization, use more convenient and reasonable.

Summary of the invention

For the deficiency that prior art exists, the purpose of this utility model is, provides a kind of contact pipe inside weld reinforcement measurement mechanism, solves and measures the problem that efficiency is low and data read error is large, to make to enhance productivity in process of production and reading accuracy.

In order to solve the problems of the technologies described above, the utility model adopts following technical scheme to be achieved:

A kind of contact pipe inside weld reinforcement measurement mechanism, comprise walker, walker is provided with Swing Arm, the swinging support point of Swing Arm is positioned at the circle centre position of tubular workpiece;

Swing Arm is provided with displacement transducer, the end of displacement transducer is provided with the roller contacted with tubular workpiece, roller under the drive of Swing Arm along tubular workpiece inner surface movement, when roller contact is protruding to the face of weld on tubular workpiece, the height of roller changes, the reinforcement of face of weld projection is converted to the change of the output signal of displacement transducer, obtain pipe inside weld reinforcement according to the change of the output signal of displacement transducer.

Scheme of the present utility model also has distinguishes technical characteristic as follows:

Particularly, described displacement transducer comprises the sensor housing of insulation, inserts the push rod that can move relative to sensor housing at through sensor housing two ends outside sensor housing;

On push rod in sensor housing, cover has Compress Spring, and one end of Compress Spring withstands on the inwall of sensor housing one end, and the other end of Compress Spring withstands on the slide plate of the conduction be cemented on push rod;

Parallelly with push rod in sensor housing be installed with Metallic rod, slide plate contacts with Metallic rod can relative sliding;

The input end at Metallic rod two ends loads reference voltage, slide plate is connected with output terminal, when push rod end capacity compression drives slide plate to move, a displacement signal output voltage corresponding with mandril position phase shift can be produced between output terminal and an input end, determine the displacement of push rod according to the ratio of displacement signal output voltage and reference voltage.

Further, described Swing Arm is provided with displacement transducer by displacement transducer installing plate, displacement transducer installing plate is fixedly mounted on Swing Arm, the position-adjustable of displacement transducer on displacement transducer installing plate.

Further, be equipped with dismountable guide rail in described tubular workpiece, walker can along guide rail movement.

Concrete, described walker comprises vehicle frame, and bottom of frame is provided with angle sheave;

Vehicle frame top is provided with hoist cylinder and guide pole, and the end of hoist cylinder is arranged on the bottom of upper mounting plate, upper mounting plate under the drive of hoist cylinder along guide pole elevating movement;

The top of upper mounting plate is provided with gantry pillars, and gantry pillars is provided with Swing Arm.

Further, above-mentioned concrete walker can along guide rail movement.

Further one is advanced scheme, the double track of described guide rail to be cross section be rectangle or joist steel shape, and described angle sheave is be the double rail type angle sheave that the double rail type guide rail of rectangle or joist steel shape matches with cross section.

Preferably, the both sides of the angle sheave be positioned on a guide rail in described double rail type angle sheave be stuck in guide rail carries out the angle sheave be positioned on another guide rail in spacing, described double rail type angle sheave be directly placed on guide rail does not carry out spacing.

Further another kind is advanced scheme, the guide rail of described guide rail to be cross section be leg-of-mutton single track, described angle sheave is be the monorail angle sheave that the guide rail of leg-of-mutton single track matches with cross section, and the bottom of frame of monorail angle sheave both sides is symmetrically installed with directly and the balance auxiliary wheel of tubular workpiece contact internal walls.

Further, described Swing Arm is driven by drive motor and reduction gear box and swings.

The utility model compared with prior art, has following technique effect:

Measurement mechanism of the present utility model realizes sensor butt welded seam height when there being demarcation and carries out automatic accurate measurement, displacement transducer is certain electric signal the numbers translate of composite bimetal pipe inside weld reinforcement, and signal long-distance can be delivered on host computer and show in real time.Walker carries measuring equipment in the mobile effect playing guiding and mobile device in tubular workpiece inside, walker can be elevated according to the internal diameter size of concrete tubular workpiece, the swinging support of Swing Arm point is positioned at the circle centre position of tubular workpiece, make roller can be subject to suitable axial compressive force when not touching face of weld and being protruding, ensure the accuracy of measurement result.Swing Arm can also can control by Non-follow control automatically, can complete corresponding measurement rapidly.Because it adopts the measurement scheme and displacement transducer of demarcating with mother metal, measurement measuring accuracy is high, efficiency is high, and measuring accuracy can be made to reach the features such as 0.01mm; Because it adopts rocking equipment, there is feature that is accurate when there being demarcation, high-acruracy survey inside weld reinforcement; Because it adopts control device, have the advantages that to measure different in width and height weld reinforcement, there is the features such as the sequential change of sway velocity and amplitude simultaneously, measurement products variation can be made; Because it adopts swing controlling device, there is the different in width and height weld measurement that realize in process of production, realize the sequential change of sway velocity and amplitude simultaneously, the features such as measurement products variation can be made; Wave manual overvide because it adopts, have and realize manual control survey under manual pattern in process of production, apparatus adaptability can be made strong, the feature such as more humane; Because it adopts automaton, there is the measurement realizing in process of production automatically completing weld seam according to certain sequential, can make that efficiency is high, automaticity high; Because it adopts manual overvide, have the switching realizing hand automatic mode in process of production, and Non-follow control completes measurement, what make is more humane more convenient, the features such as adaptability is stronger; Because it adopts jacking gear, have and realize discontinuous measurement in process of production, and play the feature of safeguard bit displacement sensor; Because it adopts data transmission device, have the advantages that the long distance of measurement data in the presence of a harsh environment transmits; Because it adopts host computer display device, have the advantages that measurement result is shown in real time in the condition away from measure field, there is the features such as adaptability is high, convenient and safe simultaneously.Because it adopts vehicle-mounted form, have the advantages that walking is automatically measured, solve the problem that minor diameter complex pipe internal weld seams cannot be measured simultaneously.

Accompanying drawing explanation

Fig. 1 is double rail type one-piece construction schematic diagram of the present utility model.

Fig. 2 is double rail type one-piece construction schematic diagram of the present utility model.

Fig. 3 is the structural representation of displacement transducer.

Fig. 4 is the structural representation of drive motor and reduction gear box.

Fig. 5 is that hoist cylinder and drive motor wave gauge tap circuit diagram.

Fig. 6 is drive motor peripheral circuit diagram, the swing module namely in Fig. 5.

Fig. 7 is that manual key controls the circuit diagram that waves of drive motor, waves manual control module namely in Fig. 5.

Fig. 8 controls the circuit diagram that hoist cylinder and drive motor wave control, the automatic control module namely in Fig. 5 automatically.

Fig. 9 is the manual key control flow chart of Fig. 7.

Figure 10 is the automatic control flow chart figure of Fig. 8.

In figure, the implication of each label is: 1-walker, 2-Swing Arm, 3-displacement transducer, 4-roller, 5-tubular workpiece, and 6-face of weld is protruding, 7-guide rail, 8-drive motor, 9-reduction gear box, 10-displacement transducer installing plate;

(1-1)-vehicle frame, (1-2)-angle sheave, (1-3)-hoist cylinder, (1-4)-guide pole, (1-5)-upper mounting plate, (1-6)-gantry pillars, (1-7)-contact-making switch;

(3-1)-sensor housing, (3-2)-push rod, (3-3)-Compress Spring, (3-4)-slide plate, (3-5)-Metallic rod, (3-6)-input end, (3-7)-output terminal.

Below in conjunction with accompanying drawing, explanation is further explained in detail to particular content of the present utility model.

Embodiment

Below provide specific embodiment of the utility model, it should be noted that the utility model is not limited to following specific embodiment, all equivalents done on technical scheme basis all fall into protection domain of the present utility model.

Embodiment 1:

Defer to technique scheme, as shown in Figures 1 to 4, the present embodiment provides a kind of contact pipe inside weld reinforcement measurement mechanism, comprise walker 1, walker 1 is provided with Swing Arm 2, the swinging support point of Swing Arm 2 is positioned at the circle centre position of tubular workpiece 5, making roller 4 can be subject to suitable axial compressive force when not touching face of weld projection 6, ensureing the accuracy of measurement result;

Swing Arm 2 is provided with displacement transducer 3, the end of displacement transducer 3 is provided with the roller 4 contacted with tubular workpiece 5, roller 4 under the drive of Swing Arm 2 along tubular workpiece 5 inner surface movement, roller 4 touch face of weld on tubular workpiece 5 protruding 6 time roller 4 height change, the reinforcement of face of weld projection 6 is converted to the change of the output signal of displacement transducer 3, obtain pipe inside weld reinforcement according to the change of the output signal of displacement transducer 3.

Particularly, displacement transducer 3 comprises the sensor housing 3-1 of insulation to the scheme of the present embodiment, inserts the push rod 3-2 that can move relative to sensor housing 3-1 at through sensor housing 3-1 two ends outside sensor housing 3-1;

On push rod 3-2 in sensor housing 3-1, cover has Compress Spring 3-3, and one end of Compress Spring 3-3 withstands on the inwall of sensor housing 3-1 one end, and the other end of Compress Spring 3-3 withstands on the slide plate 3-4 of the conduction be cemented on push rod 3-2;

Parallelly with push rod 3-2 in sensor housing 3-1 be installed with Metallic rod 3-5, slide plate 3-4 contacts with Metallic rod 3-5 can relative sliding;

The input end 3-6 at Metallic rod 3-5 two ends loads reference voltage, slide plate 3-4 is connected with output terminal 3-7, when push rod 3-2 end capacity compression drives slide plate 3-4 to move, a displacement signal output voltage corresponding with push rod 3-2 displacement can be produced between an output terminal 3-7 and input end 3-6, determine the displacement of push rod 3-2 according to the ratio of displacement signal output voltage and reference voltage.

The scheme of the present embodiment further, Swing Arm 2 is provided with displacement transducer 3 by displacement transducer installing plate 10, displacement transducer installing plate 10 is fixedly mounted on Swing Arm 2, the position-adjustable of displacement transducer 3 on displacement transducer installing plate 10, make measurement mechanism can adapt to the tubular workpiece 5 of different-diameter, the radius according to tubular workpiece 5 adjusts.

Further, be equipped with dismountable guide rail 7 in tubular workpiece 5, walker 1 can move along guide rail 7, makes the traveling process of walker 1 more smooth and easy, is also convenient to location.

The scheme of the present embodiment is concrete, and walker 1 comprises vehicle frame 1-1, is provided with angle sheave 1-2 bottom vehicle frame 1-1;

Vehicle frame 1-1 top is provided with hoist cylinder 1-3 and guide pole 1-4, and the end of hoist cylinder 1-3 is arranged on the bottom of upper mounting plate 1-5, upper mounting plate 1-5 under the drive of hoist cylinder 1-3 along guide pole 1-4 elevating movement;

The top of upper mounting plate 1-5 is provided with gantry pillars 1-6, gantry pillars 1-6 is provided with Swing Arm 2.

In the present embodiment, above-mentioned concrete walker 1 can move along guide rail 7.

The scheme of the present embodiment further one is advanced scheme, as shown in Figure 1, guide rail 7 for cross section be the double track of rectangle or joist steel shape, described angle sheave 1-2 is be the double rail type angle sheave 1-2 that the double rail type guide rail 7 of rectangle or joist steel shape matches with cross section.

Preferably, the both sides being positioned at the angle sheave 1-2 on a guide rail 7 in double rail type angle sheave 1-2 be stuck in guide rail 7 carries out spacing, in described double rail type angle sheave 1-2 the angle sheave 1-2 be positioned on another guide rail 7 be directly placed on guide rail 7 does not carry out spacing, can locate, the complexity of guide rail 7 can be reduced again, reduce costs, measuring speed is fast.

The scheme of the present embodiment further another kind is advanced scheme, as shown in Figure 2, guide rail 7 for cross section be the guide rail 7 of leg-of-mutton single track, described angle sheave 1-2 is be the monorail angle sheave 1-2 that the guide rail 7 of leg-of-mutton single track matches with cross section, the vehicle frame 1-1 bottom symmetrical of monorail angle sheave 1-2 both sides is provided with directly and the balance auxiliary wheel 1-7 of tubular workpiece 5 contact internal walls, monorail good positioning effect.

Further, Swing Arm 2 is driven by drive motor 8 and reduction gear box 9 and swings the scheme of the present embodiment.Swing Arm 2 can manually also can be controlled by automated procedures by key control.As shown in Fig. 5 to Figure 10.

Fig. 5 is that hoist cylinder and drive motor wave gauge tap circuit diagram, can switch between manual and automatic, control the lifting of hoist cylinder 1-3 and the rotation of drive motor 8, and then control waving of Swing Arm 2, mainly comprise gauge tap, relay module and corresponding circuit; Press K1 and K2, handle pushes manually from gauge tap, and corresponding relay A, B, C are in normally open, now enter Non-follow control situation; Push rod is risen switch and pushes upper raise-position, push rod rises, switch return; Switch is fallen in push rod and pushes decline position, push rod declines, switch return; Click Sidesway switch, wave measurement, then click, wave return; Thus realize each device of Non-follow control and complete whole measurement.

Fig. 6 is drive motor peripheral circuit diagram, the swing module namely in Fig. 5, mainly comprises the relay-operated controller based on NE555 chip, the machine governor based on NE555 chip and 5 pin relays; Chip NE555 forms time base circuit with inner timer, is mainly used to provide time sequential pulse to external circuit; P75 field effect transistor is mainly used to control motor; Closed K1, electric current flows to each load through overcurrent fuse, now the timer of 555 compositions enters steady state (SS), now the voltage of timing capacitor C1 is VCC, all high level for two inputs (R, S) 555 these equivalent triggers, export as low level, relay 1 not adhesive, motor does not turn; When C or D termination high level, triode ON, timing capacitor C1 discharges immediately, and now 555 two, equivalent triggers are input as R=0, S=0, export as high level, relay 1 adhesive, and normal opened contact closes, and motor rotates forward; When C or D holds high level moment step-down level, so timing capacitor C1 charges, timer enters temporary stable state, when the voltage of C1 is charged to 2/3VCC, timing arrives, and now 555 two, equivalent triggers are input as R=1, S=1, export as low level, relay 1 discharges, and timer returns to stable state, and motor does not turn; The adjustment of timing is by the RP potentiometer in operation timer; In the timer of NE555 chip composition, the timing being calculated as parameter in T=1.1 (RP+R1) XC1, figure corresponding of timing is 1S to 120S.Need the change of E or F place level during motor reversal, corresponding is that relay 2 works, the same when its timing working process and rotating forward.For the machine governor based on NE555 chip, timing capacitor carrys out the change of control output end level by the change that 2,6 and 7 pin controlling 555 chips control two input end level of 555 equivalent triggers, thus make 3 pin export PWM ripple, PWM ripple effect P75 field effect transistor controls motor, control the rotating speed of motor by the dutycycle of control RP3 potentiometer control PWM ripple, realize the continuous speed adjustment of motor.

Fig. 7 is that manual key controls the circuit diagram that waves of drive motor, waves manual control module namely in Fig. 5, mainly comprises based on the control chip minimum system circuit of 89C52, the external memory chip circuit based on 24C2 and the mu balanced circuit based on 7805, as shown in Figure 9, when cutting under Non-follow control measuring state, the power supply of 12V is export 5V power supply to power to modules respectively and make its work through Voltage stabilizing module (7805), now control chip work, through system initialization, enter main circulating program, interrupt 0 at master routine peripheral and judge whether that pin generation level changes, when pressing inductive switch, when level changes, open interruption, single-chip microcomputer enters interrupt routine, the value of last time stored in the I in 24C02 is first read in interrupt routine, if I is for having waved to illustrate, just I assignment 2, and I value stored in 24C02, recover after holding level instantaneous variation by the D in pin control chart 5 simultaneously, rocking equipment return, if I value is 2, illustrate that rocking equipment is in original state, needs wave, just I assignment 1, and I value stored in 24C02, recover after holding level instantaneous variation by the F in pin control chart 5 simultaneously, rocking equipment waves, get back to main circulating program after completing, if level change does not occur the pin of external interrupt 0, master routine just circulates always.

Fig. 8 controls the circuit diagram that hoist cylinder and drive motor wave control, the automatic control module namely in Fig. 5 automatically, mainly comprise based on the control chip minimum system circuit of 90C52, relay circuit and based on 7805 mu balanced circuit; As shown in Figure 10, press K1 and K2, when cutting under auto state, corresponding relay A, B, C adhesive, the power supply of 12V is export 5V power supply to power to modules respectively and make its work through Voltage stabilizing module (7805), now control chip work, through system initialization, enters master routine, according to measure sequential be first measurement mechanism rise, measure, measurement mechanism declines, return; Control chip controls triode ON by relay 1 adhesive by controlling pin, push rod rises, relay 1 disconnects, measurement is waved in level change realization afterwards by controlling pin control E end, control triode ON by relay 2 adhesive by controlling pin afterwards, push rod declines, relay 2, level change afterwards by controlling pin control C end realizes return, carrys out time delay afterwards according to the distance of interval measurement; Circulation realizes automatically measuring successively.

The concrete use procedure of said apparatus is as described below:

Weld reinforcement manual measurement process: connect all power supplys, press K1 and K2, hand automatic switch in Fig. 5 is pushed manual gear, walker 1 stop motion, relay A, B, C is in normally open, now wave manual control module energising, hoist cylinder switch is dialled in upper raise-position, the equipment that hoist cylinder 1-3 promotes on upper mounting plate 1-5 rises under the guide effect of guide pole 1-4, when being raised to measuring height, hoist cylinder rising switch return, click and reset key in data processing equipment or upper computer software input clearing make when pre-test numerical value resets, set up relative zero coordinate, now click Sidesway switch in Fig. 5, realize waving of Swing Arm 2, thus drive displacement transducer 3 butt welded seam reinforcement to measure, when roller 4 is through weld flush face, the output signal of displacement transducer 3 is raw to be changed, signal is through data processing equipment, to signal transacting, read weld reinforcement, and the signal long-distance processed is passed to DTU (Data Transfer unit), signal is transformed, pass to host computer, and show on host computer, afterwards switch is fallen in hoist cylinder in Fig. 5 and push decline position, realize the equipment return on upper mounting plate 1-5, when after return, switch return falls in oil cylinder, now realize Swing Arm 2 return clicking Sidesway switch in Fig. 5, whole measuring process is completed from drive displacement transducer 3.By the change regulating potentiometer RP1 and RP3 in Fig. 6 to realize rocking tendency and speed, to make the adaptability of measurement stronger.

The automatic measuring process of weld reinforcement: connect all power supplys, press K1 and K2, hand automatic switch in Fig. 5 is pushed automatic catch, now walker 1 stop motion, now relay A, B, C is energized adhesive, automatic control module is energized, now hoist cylinder 1-3 and Swing Arm 2 complete by automatic control module according to certain measurement sequential control, as Fig. 8, P2.1 level changes, corresponding triode ON and relay 1 adhesive, the equipment that hoist cylinder 1-3 promotes on upper mounting plate 1-5 rises, when being raised to measuring height, P2.1 level recovers, corresponding triode cut-off and relay 1 disconnect, click and reset key in data processing equipment or upper computer software input clearing make when pre-test numerical value resets, set up relative zero coordinate, now recover after P2.4 level instantaneous variation, measurement is waved in realization, when roller 4 is through weld flush face, the output signal of displacement transducer 3 is raw to be changed, signal is through data processing equipment, to signal transacting, read weld reinforcement, and the signal long-distance processed is passed to DTU (Data Transfer unit), signal is transformed, pass to host computer, and show on host computer, P2.2 level change afterwards, corresponding triode ON and relay 2 adhesive, hoist cylinder 1-3 drives the equipment on upper mounting plate 1-5 to decline, when after return, P2.2 level recovers, corresponding triode cut-off and relay 2 disconnect, realize measuring equipment return, when after return, now recover after P2.3 level instantaneous variation to realize Swing Arm 2 return, from drive displacement transducer 3 return, complete whole measuring process, walker 1 moves afterwards, distance measurement process according to interval measurement circulates, thus complete multi-point every automatic measurement.By the change regulating potentiometer RP1 and RP3 in Fig. 3 to realize rocking tendency and speed, to make the adaptability of measurement stronger.

Weld reinforcement measuring-signal transmitting procedure: the input end 3-6 of the Metallic rod 3-5 on displacement transducer 3 passes into+5V and 0V voltage respectively, pressure reduction is formed at input end 3-6 two ends, when roller 4 contacts with face of weld protruding 6, the push rod 3-2 relative sensors housing 3-1 of displacement transducer 3 moves, Metallic rod length in the slide plate 3-4 of displacement transducer 3 and one end place in circuit of Metallic rod 3-5 changes, the voltage signal of the output terminal 3-7 on slide plate 3-4 is caused to change, voltage signal passes in data processing equipment and processes signal, and the signal transmission after process to PC host computer, and weld reinforcement and track is demonstrated in real time on upper computer software, thus complete the measurement of weld reinforcement and the transmission of corresponding signal.

Claims (10)

1. a contact pipe inside weld reinforcement measurement mechanism, it is characterized in that: comprise walker (1), walker (1) is provided with Swing Arm (2), the swinging support point of Swing Arm (2) is positioned at the circle centre position of tubular workpiece (5);

Swing Arm (2) is provided with displacement transducer (3), the end of displacement transducer (3) is provided with the roller (4) contacted with tubular workpiece (5), roller (4) under the drive of Swing Arm (2) along tubular workpiece (5) inner surface movement, when roller (4) touches face of weld projection (6) on tubular workpiece (5), the height of roller (4) changes, the reinforcement of face of weld projection (6) is converted to the change of the output signal of displacement transducer (3), pipe inside weld reinforcement is obtained according to the change of the output signal of displacement transducer (3).

2. contact pipe inside weld reinforcement measurement mechanism as claimed in claim 1, it is characterized in that: described displacement transducer (3) comprises the sensor housing (3-1) of insulation, insert the push rod (3-2) that can move relative to sensor housing (3-1) at through sensor housing (3-1) two ends from sensor housing (3-1) outside;

The upper cover of push rod (3-2) in sensor housing (3-1) has Compress Spring (3-3), one end of Compress Spring (3-3) withstands on the inwall of sensor housing (3-1) one end, and the other end of Compress Spring (3-3) withstands on the slide plate (3-4) of the conduction be cemented on push rod (3-2);

Parallelly with push rod (3-2) in sensor housing (3-1) be installed with Metallic rod (3-5), slide plate (3-4) contacts with Metallic rod (3-5) can relative sliding;

The input end (3-6) at Metallic rod (3-5) two ends loads reference voltage, slide plate (3-4) is connected with output terminal (3-7), when push rod (3-2) end capacity compression drives slide plate (3-4) mobile, a displacement signal output voltage corresponding with push rod (3-2) displacement can be produced between output terminal (3-7) and an input end (3-6), determine the displacement of push rod (3-2) according to the ratio of displacement signal output voltage and reference voltage.

3. contact pipe inside weld reinforcement measurement mechanism as claimed in claim 1, it is characterized in that: described Swing Arm (2) is provided with displacement transducer (3) by displacement transducer installing plate (10), displacement transducer installing plate (10) is fixedly mounted on Swing Arm (2), the position-adjustable of displacement transducer (3) on displacement transducer installing plate (12).

4. contact pipe inside weld reinforcement measurement mechanism as claimed in claim 1, it is characterized in that: be equipped with dismountable guide rail (7) in described tubular workpiece (5), walker (1) can move along guide rail (7).

5. contact pipe inside weld reinforcement measurement mechanism as claimed in claim 1, is characterized in that: described walker (1) comprises vehicle frame (1-1), and vehicle frame (1-1) bottom is provided with angle sheave (1-2);

Vehicle frame (1-1) top is provided with hoist cylinder (1-3) and guide pole (1-4), the end of hoist cylinder (1-3) is arranged on the bottom of upper mounting plate (1-5), upper mounting plate (1-5) under the drive of hoist cylinder (1-3) along guide pole (1-4) elevating movement;

The top of upper mounting plate (1-5) is provided with gantry pillars (1-6), gantry pillars (1-6) is provided with Swing Arm (2).

6. contact pipe inside weld reinforcement measurement mechanism as claimed in claim 5, it is characterized in that: be equipped with dismountable guide rail (7) in described tubular workpiece (5), walker (1) can move along guide rail (7).

7. contact pipe inside weld reinforcement measurement mechanism as claimed in claim 6, it is characterized in that: described guide rail (7) for cross section be the double track of rectangle or joist steel shape, described angle sheave (1-2) is the double rail type angle sheave (1-2) that the double rail type guide rail (7) being rectangle or joist steel shape with cross section matches.

8. contact pipe inside weld reinforcement measurement mechanism as claimed in claim 7, it is characterized in that: the both sides being positioned at the angle sheave (1-2) on a guide rail (7) in described double rail type angle sheave (1-2) be stuck in guide rail (7) carries out the angle sheave (1-2) be positioned on another guide rail (7) in spacing, described double rail type angle sheave (1-2) be directly placed on guide rail (7) does not carry out spacing.

9. contact pipe inside weld reinforcement measurement mechanism as claimed in claim 6, it is characterized in that: described guide rail (7) for cross section be the guide rail (7) of leg-of-mutton single track, described angle sheave (1-2) is the monorail angle sheave (1-2) that the guide rail (7) being leg-of-mutton single track with cross section matches, and vehicle frame (1-1) bottom symmetrical of monorail angle sheave (1-2) both sides is provided with directly and the balance auxiliary wheel (1-7) of tubular workpiece (5) contact internal walls.

10. contact pipe inside weld reinforcement measurement mechanism as claimed in claim 1, is characterized in that: described Swing Arm (2) is driven by drive motor (8) and reduction gear box (9) and swings.