CN110095104B

CN110095104B - Straightness detection device for internal bus of small-caliber tubular workpiece pipe

Info

Publication number: CN110095104B
Application number: CN201910356749.2A
Authority: CN
Inventors: 于殿泓; 张慧杰; 李琳; 张辉
Original assignee: Xian University of Technology
Current assignee: Xian University of Technology
Priority date: 2019-04-29
Filing date: 2019-04-29
Publication date: 2021-05-25
Anticipated expiration: 2039-04-29
Also published as: CN110095104A

Abstract

The invention discloses a straightness detection device for a bus in a small-caliber tubular workpiece tube, which comprises a guide rod, wherein the guide rod is provided with a groove along the axial direction, two side walls of the groove are provided with mutually parallel sliding grooves, each sliding groove is internally provided with a roller, the guide rod is fixedly connected with a roller driving device, the roller driving device drives the rollers to roll along the sliding grooves, the two rollers are connected through a connecting shaft, the connecting shaft is also movably connected with a connecting rod, one end of the connecting rod extends out of the groove, and one end of the connecting rod is rigidly connected with a detection device capable of detecting the straightness of the bus in the tubular workpiece tube.

Description

Straightness detection device for internal bus of small-caliber tubular workpiece pipe

Technical Field

The invention belongs to the technical field of tubular workpiece detection, and relates to a straightness detection device for a bus in a small-caliber tubular workpiece pipe.

Background

With the continuous development and application of the tubular workpiece detection technology, the research of the tubular workpiece detection system is more and more concerned and more emphasized by people, and the tubular workpieces are widely applied in military or industrial production, particularly the application of small-diameter tubular workpieces, such as cannon barrels, transport tubes and the like, is more and more extensive. However, for the inner surface generatrix (plain wire) of these tubular workpieces, the straightness thereof is not only difficult to be ensured with respect to the straightness of the outer surface generatrix, but also difficult to detect due to the limitations of the small-bore pipe itself, but in terms of use, the detection of parameters of the inner surface of the small-bore tubular workpiece is indispensable, and the accuracy of these parameters directly affects the use of the workpiece. The geometric parameter detection of the inner surface of the tubular workpiece comprises two aspects of defect detection and form and position error detection, wherein the straightness error detection of the bus belongs to the form and position error detection.

At present, the methods for detecting the straightness of the bus in the tubular workpiece mainly include an air plug gauge method, an ultrasonic detection method, an optical detection method and the like, but some detection methods are too large in detection device, limited by a detection environment, low in detection precision and mostly not suitable for high-precision detection.

Disclosure of Invention

The invention aims to provide a device for detecting the straightness of a bus in a small-caliber tubular workpiece tube, which has the characteristic of high applicability.

The technical scheme includes that the straightness detection device for the bus in the small-caliber tubular workpiece tube comprises a guide rod, wherein the guide rod is provided with a groove along the axial direction, two side walls of the groove are provided with mutually parallel sliding grooves, each sliding groove is internally provided with a roller, the guide rod is fixedly connected with a roller driving device, the roller driving device can drive the rollers to roll along the sliding grooves, a connecting shaft is connected between the rollers in the sliding grooves, the connecting shaft is also movably connected with a connecting rod, one end of the connecting rod extends out of the groove, and one end of the connecting rod is rigidly connected with a detection device capable of detecting the straightness of the bus in the tubular workpiece tube.

The invention is also characterized in that:

drive arrangement includes the mounting panel, the mounting panel is located the one end department that is close to the guide bar, the rigid coupling has driving motor on the mounting panel, it has the round hole to open on the guide bar, the round hole is located the one end department that is close to the guide bar, the round hole is linked together with the recess on the guide bar, driving motor's main shaft passes in the round hole stretches into the recess of guide bar, the rigid coupling has the drive wheel on the driving motor main shaft, the drive wheel is located the recess of guide bar, the rigid coupling has from the driving wheel in the recess of guide bar, be located the other end department that is close to the guide bar from the driving wheel, connect through the tooth belt between driving wheel and the drive wheel, every.

Two ends of the toothed belt are connected through a belt joint, and the belt joint is fixed on the connecting shaft.

The detection device comprises an auxiliary support box, a top plate of the auxiliary support box is connected with a connecting rod, the inner wall of the top plate of the auxiliary support box is fixedly connected with an electromagnet a, the inner wall of a bottom plate of the auxiliary support box is fixedly connected with an electromagnet b, a horizontal reference plate is arranged in the auxiliary support box and is parallel to the bottom plate of the auxiliary support box, the long edge of the horizontal reference plate is in the same direction with the groove of the guide rod, two big head bolts are arranged on the horizontal reference plate along the long edge direction, each big head bolt penetrates through the horizontal reference plate and the bottom plate of the auxiliary support box and then extends out of the auxiliary support box, a gasket is arranged between each big head bolt and the top surface of the horizontal reference plate, a nut is arranged between each big head bolt and the lower surface of the horizontal reference plate, the nut is positioned in the auxiliary support box, an inclination angle sensor is fixedly connected on the top surface of the horizontal reference, the top surface of the horizontal reference plate is also fixedly connected with a power supply controller, the power supply controller is electrically connected with the electromagnet a, the power supply controller is electrically connected with the electromagnet b, and the power supply controller is in signal connection with a remote controller.

The horizontal reference plate is provided with a long groove a along the long edge direction, the bottom plate of the auxiliary support box is provided with a groove b, the size of the groove b is the same as that of the long groove a, the position of the groove b corresponds to that of the long groove a, the two sides of the groove b are uniformly provided with a plurality of threaded holes along the groove b direction, each big head bolt penetrates through the long groove a and the groove b and then extends out of the auxiliary support box, the surface of the bottom plate of the auxiliary support box is provided with a limiting piece, the center of the limiting piece is provided with a round hole, one big head bolt penetrates through the round hole, the round hole is in clearance fit with the big head bolt, the two sides of the round hole are provided with a groove c, the groove c penetrates through the limiting piece, the groove corresponds to the threaded hole of.

One end of each big head bolt extending out of the auxiliary supporting box is provided with a ball head column base.

The surface of the guide rod is fixedly connected with a limiting block along two sides of the groove respectively.

The one end of connecting rod is connected with U type spare, and two relative lateral walls of U type spare have all opened the through-hole, and the through-hole of two lateral walls is coaxial, and the diameter of through-hole is the same with the diameter size of connecting axle, and connecting axle one end is fixed on a gyro wheel, and two through-hole rigid couplings are passed to the other end of connecting axle on another gyro wheel.

The equal joint in both ends of guide bar has the chuck, and the guide bar is close to the one end of mounting panel and has the support through the chuck joint, and the guide bar other end has the base through the chuck joint, has set V type frame on the base, and V type frame is located detection device's below.

The device for detecting the straightness of the bus in the small-caliber tubular workpiece pipe has the advantages that the measuring assembly is in two-point contact with the bus of the tubular workpiece to be detected, a plate bridge of a traditional pitch measuring method is replaced, the measurement accuracy of the straightness measured by the traditional pitch method is improved, the device has the characteristics of high applicability and high detection accuracy, the measurement accuracy of the straightness is improved, and the abrasion to a measuring surface and the measuring device is reduced.

Drawings

Fig. 1 is a side sectional view of a straightness detecting device for a busbar in a small-caliber tubular workpiece pipe according to the present invention;

FIG. 2 is a front cross-sectional view of the apparatus for detecting the straightness of the busbar in the small-caliber tubular workpiece tube according to the present invention;

FIG. 3 is a bottom view of an auxiliary support box of the straightness detection device for the internal bus of the small-caliber tubular workpiece pipe of the present invention;

FIG. 4 is a schematic view of the apparatus for detecting the straightness of the busbar inside the small-caliber tubular workpiece tube according to the present invention;

FIG. 5 is a cross-sectional view of the apparatus for detecting the straightness of the busbar in the small-caliber tubular workpiece tube according to the present invention, the apparatus being not in contact with the busbar of the tubular workpiece to be measured;

FIG. 6 is a cross-sectional view of the apparatus for detecting the straightness of the busbar in the tube of the small-caliber tubular workpiece according to the present invention placed in the tubular workpiece to be measured;

FIG. 7 is a cross-sectional view of the apparatus for detecting the straightness of the busbar in the small-caliber tubular workpiece tube according to the present invention, in contact with the busbar of the tubular workpiece to be measured;

fig. 8 is a main sectional view of the straightness detection device for a bus bar in a small-caliber tubular workpiece pipe according to the present invention at the time of measurement pitch adjustment;

fig. 9 is a cross-sectional view of the small-diameter tubular workpiece pipe internal bus straightness detection device according to the present invention, when there is a small angle deviation between the guide bar and the measured bus.

In the figure, 1, a guide rod, 2, a roller, 3, a connecting shaft, 4, a toothed belt, 5, a belt joint, 6, a driving motor, 7, a motor mounting plate, 8, a driving wheel, 9, a driven wheel, 10, a limit switch, 11, a connecting rod, 12, an auxiliary supporting box, 13, a limit block, 14, an electromagnet a, 15, a big head bolt, 16, a gasket, 17, an inclination angle sensor, 18, a horizontal reference plate, 19, a nut, 20, a ball head column base, 21, an electromagnet b, 22, a limit sheet, 23, a workpiece to be measured, 24, a V-shaped frame, 25, a chuck, 26, a base, 27, a support and 28 are provided with a power supply controller.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

The invention relates to a straightness detection device for a bus in a small-caliber tubular workpiece tube, which comprises a guide rod 1, wherein the guide rod 1 is axially provided with a groove, the surface of the guide rod 1 is fixedly connected with a limiting block 13 along two sides of the groove respectively, two side walls of the groove are provided with mutually parallel sliding grooves, each sliding groove is internally provided with a roller 2, the guide rod 1 is fixedly connected with a roller driving device, the roller driving device can drive the rollers 2 to roll along the sliding grooves, a connecting shaft 3 is arranged between the rollers 2 in the sliding grooves, the connecting shaft 3 is also movably connected with a connecting rod 11, one end of the connecting rod 11 extends out of the groove, one end of the connecting rod 11 is rigidly connected with a detection device capable of detecting the straightness of the bus in the tubular workpiece tube, one end of the connecting rod 11 is connected with a U-shaped part, two opposite side walls of the U-shaped part are provided with through holes, the through, one end of a connecting shaft 3 is fixed on one roller 2, the other end of the connecting shaft 3 passes through two through holes and is fixedly connected on the other roller 2, as shown in figure 2, the driving device comprises a mounting plate 7, the mounting plate 7 is positioned at one end close to a guide rod 1, a driving motor 6 is fixedly connected on the mounting plate 7, a round hole is formed in the guide rod 1 and is positioned at one end close to the guide rod 1, the round hole is communicated with a groove on the guide rod 1, a main shaft of the driving motor 6 passes through the round hole and extends into the groove of the guide rod 1, a driving wheel 8 is fixedly connected on the main shaft of the driving motor 6, the driving wheel 8 is positioned in the groove of the guide rod 1, a driven wheel 9 is fixedly connected in the groove of the guide rod 1, the driven wheel 9 is positioned at the other end close to the guide rod 1, each roller 2 is positioned between the driven wheel, two ends of a toothed belt 4 are fixed on a connecting shaft 3, two ends of the toothed belt 4 are connected through a belt joint 5, the belt joint 5 is fixed on the connecting shaft 3, the detection device comprises an auxiliary support box 12, a top plate of the auxiliary support box 12 is connected with a connecting rod 11, an electromagnet a14 is fixedly connected to the inner wall of the top plate of the auxiliary support box 12, an electromagnet b21 is fixedly connected to the inner wall of a bottom plate of the auxiliary support box 12, a horizontal reference plate 18 is arranged inside the auxiliary support box 12, the horizontal reference plate 18 is parallel to the bottom plate of the auxiliary support box 12, the long edge of the horizontal reference plate 18 is in the same direction with the groove of the guide rod 1, two big head bolts 15 are arranged on the horizontal reference plate 18 along the long edge direction, each big head bolt 15 penetrates through the horizontal reference plate 18 and the bottom plate of the auxiliary support box 12 and extends out of the auxiliary support box 12, a gasket 16 is arranged between each big head, a nut 19 is arranged between each big head bolt 15 and the bottom surface of the horizontal reference plate 18, the nut 19 is positioned in the auxiliary support box 12, the top surface of the horizontal reference plate 18 is fixedly connected with an inclination angle sensor 17, the inclination angle sensor 17 is in signal connection with a remote controller, the top surface of the horizontal reference plate 18 is also fixedly connected with a power controller 28, the power controller 28 is electrically connected with an electromagnet a14, the power controller 28 is electrically connected with an electromagnet b21, the power controller 28 is in signal connection with the remote controller, the horizontal reference plate 18 is provided with a long groove a along the long edge direction, the bottom plate of the auxiliary support box 12 is provided with a slot b, the long groove a and the slot b are the same in size, the long groove a corresponds to the slot b in position, two sides of the slot b are uniformly provided with a plurality of threaded holes along the slot b, each big head bolt 15 extends out of the auxiliary support box 12 after penetrating through the long groove a and the slot b, the center of the limiting sheet 22 is provided with a round hole, a big-end bolt 15 penetrates through the round hole, the round hole is in clearance fit with the big-end bolt 15, two sides of the round hole are provided with grooves c, the grooves c penetrate through the limiting sheet 22, the grooves correspond to threaded holes of a bottom plate of the c auxiliary support box 12, a plurality of screws are arranged on the limiting sheet 22, the screws penetrate through the grooves and are in threaded connection with the threaded holes, the screws penetrate through the long grooves c and are installed in the threaded holes and tightly press the limiting sheet 22, one end, extending out of the auxiliary support box 12, of each big-end bolt 15 is provided with a ball stud 20, as shown in fig. 4, two ends of the guide rod 1 are respectively clamped with a chuck 25, one end, close to the mounting plate 7, of the guide rod 1 is clamped with a support 27 through the chuck 25, the other end of the guide rod is clamped with.

A straightness detection device for a bus in a small-caliber tubular workpiece pipe is characterized in that a toothed belt 4 is arranged between a driving wheel 8 and a driven wheel 9, two ends of the toothed belt 4 are connected through a belt joint 5, the belt joint 5 is fixed on a connecting shaft 3, so that the purpose that the connecting shaft 3 and a roller 2 move back and forth along with a guide rod 1 due to the rotation of the toothed belt 4 is achieved, the arrangement of a limiting block 13 limits the deflection freedom degree of an auxiliary supporting box 12 along with the connecting shaft 3 in a groove of the guide rod 1, the auxiliary supporting box 12 only swings through a connecting rod 11, a limiting sheet 22 is arranged, the distance between two large-head bolts 15 is convenient to adjust, a support 27 is clamped with a chuck 25, a base 26 is clamped with the chuck 25, the chucks 25 are clamped at two ends of the guide rod 1, the device can be disassembled to conveniently place and replace workpieces to be detected, a V-, the power controller 28 and the tilt sensor 17 are in signal connection with a remote controller, which facilitates data statistics measured by the tilt sensor 17 and control of the power.

A straightness detection device for a bus in a small-caliber tubular workpiece pipe is shown in figure 5, when not measured, a power controller 28 controls an electromagnet 14 to be electrified to generate electromagnetic force to be attracted with a big-end bolt 15, so that the two big-end bolts 15 and a horizontal reference plate 18 installed together with the two big-end bolts 15 are lifted up, two ball-head column feet 20 are separated from a measurement bus, and then a guide rod 1, a V-shaped frame 24, a base 26 and a tubular workpiece 23 to be measured are subjected to position adjustment, as shown in figure 6, the two ball-head column feet 20 are ensured to fall on the bus in the tubular workpiece 23 to be measured but cannot be close to each other, so that the measurement assembly has no adjustable range; after the measurement preparation work is finished, the driving motor 6 is started to drive the auxiliary supporting box 12 and the horizontal reference plate 18 (including the inclination angle sensor 17 arranged on the auxiliary supporting box) to move to the measurement starting position together, and the motor 6 stops running to prepare for measurement; during measurement, as shown in fig. 7, the power controller 28 controls the electromagnet 14 to be powered off, the power controller 28 controls the electromagnet 21 to be powered on to generate electromagnetic force in a downward direction, so that the two ball-head pins 20 arranged on the horizontal reference plate 18 are reliably contacted with a bus in the tubular workpiece 23 to be measured, the inclination angle sensor 17 measures the inclination angle of the bus at the position, after the measurement of the measurement position is completed, as shown in fig. 8 and 9, the power controller 28 controls the electromagnet 14 to be powered on, so that the measurement assembly comprises the two ball-head pins 20 lifted up to be separated from the bus in the tubular workpiece 23 to be measured, the motor 6 operates again to drive the auxiliary support box 12 and the horizontal reference plate 18 (comprising the inclination angle sensor 17 arranged thereon) to move together along the bus direction by a distance of one pitch, so that the position of a first steel ball at a second measurement point coincides with the position of a second steel ball at the first, and at the moment, the motor stops running, the inclination angle is measured for the second time, the measurement of the second position data is completed, the measurement of the whole bus is sequentially completed according to the rule, the linearity error of the measured bus can be obtained by performing wireless transmission on the original measurement data and fitting processing by using a least square method, performing point drawing and analyzing and using a minimum condition evaluation method.

The measurement principle of the straightness detection device for the internal bus of the small-caliber tubular workpiece pipe is as follows: the pitch is the distance between the centers of the two ball-head column feet, the measurement assembly is controlled to move forwards by the rotation number of the driving motor, when measurement is carried out, the inclination angle sensor is combined with the horizontal reference plate, the height change (reflecting the fluctuation state of the bus to be measured) of the two measurement ball-head column feet which are contacted with the bus to be measured is converted into the angle difference with the horizontal reference plate through the horizontal reference plate, the inclination angle sensor can sense and measure the angle difference of the current measurement point relative to the horizontal reference plate, and then the measurement data of one measurement point is obtained; after the measurement of one measurement position is completed, the measurement assembly moves a distance of one pitch along the direction of the bus to perform the next measurement, so that the position of a first ball-head column base of a second measurement point is overlapped with the position of a second ball-head column base during the first measurement, the second dip angle measurement is performed to obtain the angle difference of the second position, the measurement of the whole bus is sequentially completed according to the rule, links such as acquisition, storage and processing of measurement data are performed, and the straightness error of the measured bus is obtained by utilizing mapping analysis. Because the straightness of the measured bus is measured by the inclination angle change of the horizontal reference plate caused by the contact height change of the two measuring ball stud feet and the measured bus, the straightness of the measured bus is not dependent on the measurement of the straightness of the guide rod, and the measurement precision is not influenced even if the straightness of the guide rod is changed.

The straightness detection device for the internal bus of the small-caliber tubular workpiece pipe has the advantages that:

1. the inside of guide bar is equipped with gyro wheel, connecting axle, toothed belt, drive wheel and follows the driving wheel, and the clockwise or anticlockwise motion of belt is driven through driving motor's positive and negative rotation motion to the realization drives measuring device's advancing or retreats, has replaced traditional manual measurement with electric measurement, and the both sides gyro wheel plays the effect of support and reduction friction.

2. Due to the existence of the movable hinge, the auxiliary supporting box can deflect left and right by a certain angle in the process of moving along with the guide rod, the angle is far larger than the form and position error of straightness, so that the measurement precision is ensured, the measurement precision cannot be influenced when the guide rod and a bus to be measured have small-angle deviation, and meanwhile, the existence of the limiting block enables the auxiliary supporting box not to deflect around the connecting shaft; the auxiliary supporting box consists of a U-shaped section and an upper cover plate, and is connected through screws, so that the detection device is convenient to disassemble, adjust, inspect and maintain.

3. The large-head bolt in the measuring assembly is separated from the horizontal reference plate by a gasket, so that the horizontal reference plate is protected from being extruded and deformed by stress; the big-end bolt and the horizontal reference plate are both made of ferromagnetic materials so as to ensure that good electromagnetic force can be generated; the upper surface of the horizontal reference plate is provided with the tilt angle sensor, so that the measurement data can be conveniently acquired, stored and processed; the two big-end bolts penetrate through the long slotted holes of the U-shaped material bottom plate in a clearance fit manner; the ball stud realizes point contact with a measuring surface, replaces the traditional surface contact or line joint for measurement, and improves the measurement precision.

4. The long-slot groove of the horizontal reference plate and the long-slot hole of the U-shaped section bottom plate enable the distance between the two big-end bolts to be adjustable, and therefore the measuring pitch is variable; the horizontal reference plate is provided with scales, so that the measurement pitch can be conveniently adjusted, and when the measurement pitch is smaller than the maximum measurement pitch, the measurement assembly is prevented from moving back and forth in the auxiliary supporting box to cause measurement errors due to the action of the bottom limiting sheet.

5. The upper part and the lower part of the auxiliary supporting box are respectively provided with an electromagnet, the electromagnet at the top part adsorbs a big-end bolt to support the measuring component in the measuring process, and the ball-end column base and a workpiece bus are prevented from being rubbed to damage the surface of the workpiece in the measuring motion.

6. The base and the support of the measuring device can be separated, so that the workpiece to be measured can be conveniently mounted and dismounted; the guide rod is fixed through the chuck, so that the influence of vibration of the guide rod on the measurement precision during measurement is prevented; the V-shaped frame is replaceable to measure small bore tubular workpieces of different diameters and lengths.

Claims

1. The straightness detection device for the bus in the small-caliber tubular workpiece pipe is characterized by comprising a guide rod (1), wherein the guide rod (1) is axially provided with a groove, two parallel sliding grooves are formed in two side walls of the groove, each sliding groove is internally provided with a roller (2), the guide rod (1) is fixedly connected with a roller driving device, the roller driving device can drive the rollers (2) to roll along the sliding grooves, a connecting shaft (3) is connected between the rollers (2) in the sliding grooves, the connecting shaft (3) is also movably connected with a connecting rod (11), one end of the connecting rod (11) extends out of the groove, and one end of the connecting rod (11) is rigidly connected with a detection device capable of detecting the straightness of the bus in the tubular workpiece pipe;

the detection device comprises an auxiliary supporting box (12), a top plate of the auxiliary supporting box (12) is connected with a connecting rod (11), an electromagnet a (14) is fixedly connected to the inner wall of the top plate of the auxiliary supporting box (12), an electromagnet b (21) is fixedly connected to the inner wall of a bottom plate of the auxiliary supporting box (12), a horizontal reference plate (18) is arranged inside the auxiliary supporting box (12), the horizontal reference plate (18) is parallel to the bottom plate of the auxiliary supporting box (12), the long edge of the horizontal reference plate (18) is in the same direction with the groove of the guide rod (1), two large-head bolts (15) are arranged on the horizontal reference plate (18) along the long edge direction, each large-head bolt (15) penetrates through the bottom plate of the horizontal reference plate (18) and the auxiliary supporting box (12) and then extends out of the auxiliary supporting box (12), a gasket (16) is arranged between each large-head bolt (15) and the top surface of the horizontal reference plate (18), a nut (19) is arranged between each big head bolt (15) and the bottom surface of the horizontal reference plate (18), the nut (19) is located in the auxiliary supporting box (12), the top surface of the horizontal reference plate (18) is fixedly connected with an inclination angle sensor (17), the inclination angle sensor (17) is in signal connection with a remote controller, the top surface of the horizontal reference plate (18) is further fixedly connected with a power supply controller (28), the power supply controller (28) is electrically connected with an electromagnet a (14), the power supply controller (28) is electrically connected with an electromagnet b (21), and the power supply controller (28) is in signal connection with the remote controller;

the horizontal reference plate (18) is provided with a long groove a along the long edge direction, the bottom plate of the auxiliary support box (12) is provided with a groove b, the size of the groove a is the same as that of the long groove b, the groove b corresponds to the position of the long groove a, a plurality of threaded holes are uniformly formed in the two sides of the groove b along the groove b, each stud (15) penetrates through the long groove a and the groove b and then extends out of the auxiliary support box (12), the surface of the bottom plate of the auxiliary support box (12) is provided with a limiting sheet (22), the center of the limiting sheet (22) is provided with a round hole, one stud (15) penetrates through the round hole, the round hole is in clearance fit with the stud (15), the two sides of the round hole are provided with a groove c, the groove c penetrates through the limiting sheet (22), the groove c corresponds to the threaded hole of the bottom plate of the auxiliary support box (12), and the limiting sheet (22) is provided with, the screw penetrates through the groove c and then is in threaded connection with the threaded hole;

and a ball stud foot (20) is arranged at one end of each big head bolt (15) extending out of the auxiliary supporting box (12).

2. The straightness detection device for the internal bus bar of the small-caliber tubular workpiece pipe as claimed in claim 1, wherein the driving device comprises a mounting plate (7), the mounting plate (7) is located at one end close to the guide rod (1), a driving motor (6) is fixedly connected to the mounting plate (7), a round hole is formed in the guide rod (1), the round hole is located at one end close to the guide rod (1), the round hole is communicated with a groove in the guide rod (1), a main shaft of the driving motor (6) penetrates through the round hole and extends into the groove in the guide rod (1), a driving wheel (8) is fixedly connected to the main shaft of the driving motor (6), the driving wheel (8) is located in the groove in the guide rod (1), a driven wheel (9) is fixedly connected to the groove in the guide rod (1), and the driven wheel (9) is located at the other end close to the guide rod (1), the driven wheel (9) is connected with the driving wheel (8) through a toothed belt (4), each roller (2) is located between the driven wheel (9) and the driving wheel (8), and two ends of the toothed belt (4) are fixed on the connecting shaft (3).

3. The apparatus for detecting the straightness of a generatrix in a small-caliber tubular workpiece pipe according to claim 2, wherein both ends of the toothed belt (4) are connected by a belt joint (5), and the belt joint (5) is fixed to the connecting shaft (3).

4. The apparatus for detecting the straightness of a generatrix in a small-caliber tubular workpiece tube according to claim 1, wherein the surface of the guide bar (1) is fixedly connected with a stopper (13) along each of both sides of the groove.

5. The apparatus for detecting the straightness of the busbar inside the small-caliber tubular workpiece pipe according to claim 1, wherein one end of the connecting rod (11) is connected with a U-shaped member, through holes are formed in two opposite side walls of the U-shaped member, the through holes of the two side walls are coaxial, the diameter of each through hole is the same as that of the connecting shaft (3), one end of the connecting shaft (3) is fixed on one roller (2), and the other end of the connecting shaft (3) penetrates through the two through holes and is fixedly connected to the other roller (2).

6. The straightness detection device for the bus bar in the small-caliber tubular workpiece pipe as defined in claim 1, wherein chucks (25) are clamped at both ends of the guide rod (1), a support (27) is clamped at one end of the guide rod (1) close to the mounting plate (7) through the chucks (25), a base (26) is clamped at the other end of the guide rod through the chucks (25), a V-shaped frame (24) is arranged on the base (26), and the V-shaped frame (24) is positioned below the detection device.