CN117190867A

CN117190867A - Device and method for measuring helical lead in screw drilling tool stator by laser

Info

Publication number: CN117190867A
Application number: CN202310903639.XA
Authority: CN
Inventors: 宋开红; 江屏; 陈学广; 沈军
Original assignee: Hengtai Energy Equipment Tianjin Co ltd
Current assignee: Hengtai Energy Equipment Tianjin Co ltd
Priority date: 2023-07-23
Filing date: 2023-07-23
Publication date: 2023-12-08

Abstract

The invention relates to a device and a method for measuring the internal spiral lead of a screw drilling tool stator by laser, which are characterized in that: the middle part of the lower end of the upper platform is connected with the base plate through an upper platform forward-tilting driving mechanism, the lower end of the upper platform is hinged with the upper end part of the front main support frame near the front part, and the lower end of the upper platform is connected with the base plate through a rear follow-up supporting mechanism near the rear part; the stator supporting mechanisms are sequentially arranged at the middle front part above the upper platform front and back; the sliding table is slidably arranged at the middle and rear parts of the upper platform and is connected with the sliding table driving mechanism; the stator rotation driving mechanism is arranged at the upper end of the sliding table and comprises a servo motor, a speed reducer and a multi-jaw chuck; the three-degree-of-freedom supporting table is arranged outside the front end of the upper platform and is connected with the upper platform through a bracket; the laser range finder is fixedly arranged on the top of the three-degree-of-freedom supporting table in a way that the measuring head faces backwards; the measuring ball is used for being placed in one inner spiral groove of the screw drilling tool stator to be measured. The invention solves the problem that the long lead of the stator inner cavity of the screw drilling tool is difficult to measure.

Description

Device and method for measuring helical lead in screw drilling tool stator by laser

Technical Field

The invention belongs to the technical field of oil well tools in the field of oilfield drilling, relates to the field of measuring tools for inner cavities of stators of screw drilling tools, and particularly relates to equipment for measuring helical leads in stators of screw drilling tools by laser.

Background

With the continuous development of the domestic petroleum drilling industry, a screw drilling tool is an essential device in the petroleum drilling field, and the screw drilling tool mainly comprises a stator and a rotor. The stator and the rotor are meshed with each other in the screw drilling tool, the rotor line type and the stator line type are a pair of cycloid conjugate curve pairs, and the motor linear theory shows that the leads of the rotor and the stator curved surface are the same. The stator and the rotor are matched with each other with higher precision by measuring the internal spiral lead of the stator and then processing the rotor according to the lead.

Because the stator of the screw drilling tool has larger size, and the measuring part is positioned in the inner cavity of the stator, the common measuring workpiece cannot be used for measuring. No mature means for measuring the internal helical lead of the screw drill stator is found in the prior art.

The device capable of conveniently measuring the internal screw lead of the screw drilling tool stator by utilizing the laser ranging means is designed in advance according to the measurement requirement of the internal screw lead of the screw drilling tool stator.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides equipment for measuring the internal spiral lead of a screw drilling tool stator by laser.

One of the above objects of the present invention is achieved by the following technical solutions:

the device for measuring the internal spiral lead of the screw drilling tool stator by using the laser comprises a base plate, an upper platform, at least two groups of stator supporting mechanisms, a sliding table driving mechanism, a stator rotation driving mechanism, a laser range finder, a three-degree-of-freedom supporting table, a front main supporting frame, an upper platform forward-tilting driving mechanism, a rear follow-up supporting mechanism and a measuring ball;

the upper platform is arranged right above the base plate along the front-rear direction; the middle part of the lower end of the upper platform is connected with the base plate through an upper platform forward-tilting driving mechanism, and the position of the lower end of the upper platform close to the front part is hinged with the upper end part of the front main support frame, so that the upper platform can rotate around the hinged connection part; the lower end of the upper platform is connected with the base plate through a rear follow-up supporting mechanism at the position close to the rear part;

the stator supporting mechanisms are sequentially arranged at the middle front part above the upper platform along the front and back directions; each group of stator supporting mechanism comprises an H-shaped supporting seat, roller bearings which are arranged in a V-shaped arrangement are arranged on the outer sides of the upper ends of two vertical edges of the H-shaped supporting seat, and the screw drilling tool stator to be tested is supported through the roller bearings;

the sliding table is slidably arranged at the middle and rear parts of the upper platform along the front-rear direction and is connected with the sliding table driving mechanism;

the stator rotation driving mechanism is arranged at the upper end of the sliding table and comprises a servo motor, a speed reducer and a multi-jaw chuck; the multi-jaw chuck, the speed reducer and the servo motor are sequentially connected in the front-back direction, the servo motor and the speed reducer are fixedly arranged at the upper end of the sliding table, and the rear part of the multi-jaw chuck is supported through a bearing seat; the multi-jaw chuck is arranged at the rear side of the rearmost group of stator supporting mechanisms, and the center of the multi-jaw chuck and the center of the screw drilling tool stator to be tested supported on the plurality of groups of stator supporting mechanisms are concentrically arranged;

the three-degree-of-freedom supporting table is arranged outside the front end of the upper platform, the lower part of the front end of the upper platform is connected with an L-shaped bracket, and the three-degree-of-freedom supporting table is arranged on a transverse supporting plate of the L-shaped bracket; the three-degree-of-freedom supporting table is a supporting table capable of being adjusted in the front-back direction, the left-right direction and the up-down direction; the laser range finder is fixedly arranged at the top of the three-degree-of-freedom supporting table in a mode that a measuring head faces backwards;

the measuring ball is used for being placed in one spiral groove of the screw drilling tool stator to be measured in a clearance fit mode.

The front elastic auxiliary supporting mechanism is arranged between the lower part of the transverse supporting plate of the L-shaped bracket and the upper end of the base plate; the device comprises a cylindrical base, a pressure spring, an upper cover and a piston piece, wherein the lower end of the cylindrical base is fixedly connected with a base plate nail; a lower central positioning column is arranged at the bottom of the inner cavity of the cylindrical base, the pressure spring is arranged in the inner cavity of the cylindrical base, and the lower end part of the pressure spring is sleeved with the lower central positioning column; the upper cover is provided with a central hole and is fixed at the upper end of the cylindrical base; the piston part consists of a connector, a piston rod and a piston head which are arranged up and down in sequence; the piston head stretches into the inner cavity of the cylindrical base and forms clearance fit with the inner cavity wall, an upper center positioning column is arranged at the lower part of the piston head, and the upper center positioning column and the upper end part of the pressure spring form fit positioning fit; the piston rod of the piston piece penetrates out of the central hole of the upper cover, and the connector of the piston piece is connected with the lower end of the connecting seat fixed below the transverse supporting plate of the L-shaped bracket through a pin shaft.

The upper platform forward-tilting driving mechanism comprises a hydraulic cylinder, a push rod and a driving frame which are vertically arranged; the upper cylinder rod end of the hydraulic cylinder is fixedly connected with the lower end of the ejector rod, the upper end of the ejector rod is connected with the lower end of the driving frame through a pin shaft, and the upper end of the driving frame is fixedly connected with the middle part of the lower end of the upper platform.

Moreover, the front main support comprises a left shaft support leg, a right shaft support leg and two hinge seat support legs arranged between the two shaft support legs; hinge shafts are fixedly supported at the upper ends of the left shaft supporting leg and the right shaft supporting leg, two U-shaped hinge seats are fixedly arranged at the upper ends of the two hinge seat supporting legs, shaft holes are formed in the two U-shaped hinge seats, and the two U-shaped hinge seats are connected with the hinge shafts in a penetrating manner through the shaft holes; two hinge plates are arranged at the lower end of the upper platform near the front part, shaft holes are arranged on the two hinge plates, the two hinge plates are in rotatable fit with the hinge shaft through the shaft holes, and the two hinge plates are respectively embedded in the two U-shaped hinge seats in a clearance fit manner.

The rear follow-up supporting mechanism comprises three supporting sliding rods and a bottom sliding seat; the bottom sliding seat is fixed at the position, close to the rear part, of the upper end of the base plate; three guide sliding grooves are uniformly distributed on the bottom sliding seat along the circumferential direction, the three guide sliding grooves extend along the radial direction of the bottom sliding seat, and an end cover is fixed at the outer ends of the three guide sliding grooves; a sliding block limited in the up-down direction is respectively and slidably embedded in the three guide sliding grooves, and a hinging seat is respectively fixed above the bottom sliding seat at the upper ends of the three sliding blocks; the upper ends of the three support sliding rods are respectively connected with three hinging seats fixed at the lower end of the upper platform and close to the rear part through upper hinging shafts, and the three hinging seats are uniformly distributed on the same circumference and are coaxially arranged up and down with the bottom sliding seat; the lower ends of the three support slide bars are hinged with the hinge seats on the three slide blocks through a lower hinge shaft respectively.

A dovetail-shaped guide rail is fixed at the lower end of the sliding table, a dovetail-shaped guide groove along the front-rear direction is arranged at the middle-rear position of the upper end of the upper platform, and the guide rail is in sliding embedded fit with the guide groove; the sliding table driving mechanism comprises a sliding table driving motor and a sliding table driving screw rod; the sliding table driving motor is fixedly arranged on the upper platform, the output end of the sliding driving motor is connected with a sliding table driving screw rod, and the sliding table driving screw rod is supported at the upper end of the upper platform through screw rod supports positioned at the front end and the rear end; screw holes along the front-back direction are arranged at the position, close to one side, on the sliding table, and are connected with a driving screw rod through the screw holes.

The three-degree-of-freedom supporting table comprises a bottom fixed plate, a middle moving platform, an upper moving platform and a top supporting table; the bottom fixing plate is fixed on a transverse supporting plate of the L-shaped bracket; the middle moving plate is arranged above the bottom fixed plate, the upper moving platform is arranged above the middle moving platform, and the top supporting platform is arranged above the upper moving platform; a front-back movement driving mechanism is arranged between the middle moving platform and the bottom fixing plate, a left-right movement driving mechanism is arranged between the upper moving platform and the middle moving platform, and the front-back movement driving mechanism and the left-right movement driving mechanism both adopt screw nut transmission mechanisms; the upper moving platform is connected with the top supporting platform through a vertical moving driving mechanism.

The vertical movement driving mechanism comprises a front vertical plate and a rear vertical plate which are fixed on the upper moving platform; a power input shaft and a transmission shaft which are arranged along the front-rear direction are arranged on the front vertical plate and the rear vertical plate through bearings, a hand wheel is fixed at the exposed end of the front part of the power input shaft, a driving gear is arranged on the power input shaft, a first driven gear and a second driven gear are arranged on the transmission shaft, and the first driven gear is meshed with the driving gear; the second driven gear is meshed with a vertically arranged rack column arranged outside one side of the second driven gear; the other side of the second driven gear is provided with a vertical guide column which is parallel to the rack column, the rack column and the vertical guide column form guiding cooperation along the up-down direction with a vertical guide frame fixedly arranged on the upper moving platform, and the upper ends of the rack column and the vertical guide column are fixedly connected with the top supporting table.

The three-freedom supporting table is also provided with a non-return mechanism, the non-return mechanism adopts a ratchet and pawl matching mechanism and comprises a ratchet and a pawl, the ratchet is coaxially and fixedly arranged on a power input shaft, the pawl is fixedly arranged on a pawl shaft, the pawl shaft is arranged on a front vertical plate in a penetrating way, the front end of the pawl shaft is provided with a hand plate rod in a penetrating way through a pin rod, and the pin rod is matched with an elastic pushing mechanism at one end far away from the end matched with the pawl shaft and the hand plate rod in a wearing way, so that the pawl is matched with the ratchet; the elastic jacking mechanism comprises a pressure spring, an upper pressure head and a jacking rod, wherein a pressure spring mounting groove is formed in the front side of the front vertical plate, a spring guide column is arranged at the bottom of the pressure spring mounting groove, the pressure spring is embedded into the pressure spring mounting groove, the lower end of the pressure spring is sleeved on the pressure spring guide column, the upper pressure head is embedded into the pressure spring mounting groove, the upper pressure head is in pressing contact with the upper end of the pressure spring, and the upper end of the pressure spring is in sleeved fit with the spring guide column arranged at the lower end of the upper pressure head; the upper end of the upper pressure head is hinged with the lower end of the pressing rod, and the upper end of the pressing rod and one end of the pin rod, which is far away from the ratchet shaft, form vertical fixed connection in a threaded connection mode.

The second object of the present invention is achieved by the following technical scheme:

the measuring method of the device for measuring the internal spiral lead of the screw drilling tool stator based on the laser comprises the following steps:

step 1, under the condition that a multi-jaw chuck is positioned at a rear end working position, placing a screw drilling tool stator to be tested on a plurality of groups of stator supporting mechanisms, then placing a measuring ball at the front end of the screw drilling tool stator, wherein a starting end is positioned in a lowest inner spiral groove, and simultaneously fixing a laser range finder to the top of a three-degree-of-freedom supporting table;

step 2, starting a hydraulic cylinder to start ascending; the bottom sliding seat of the rear follow-up supporting mechanism starts to move from a position close to the end cover to a position far away from the end cover, the hydraulic cylinder stops lifting, the included angle between the upper platform and the base plate is 2-3 degrees, and the measuring ball presses one side of the spiral groove;

step 3, adjusting the three-degree-of-freedom supporting table to enable laser emitted by the laser range finder to be aligned with the spherical center position of the measuring ball;

step 4, starting a sliding table driving motor, driving a screw rod to drive a sliding table to move forwards through the sliding table, enabling the sliding table driving motor to stop moving when the rear end of the screw drilling tool stator is inserted into the position between the jaws of the multi-jaw chuck in the current open state, and then locking the jaws of the multi-jaw chuck to clamp and fix the rear end of the screw drilling tool stator;

step 5, measuring the distance d1 between the measuring ball and the laser range finder by using the laser range finder;

step 6, starting a servo motor, stopping movement when the multi-jaw chuck is driven to rotate by alpha degrees through a speed reducer, and moving the measuring ball backwards in the corresponding spiral groove for a certain distance at the moment;

step 7, measuring the distance d2 between the measuring ball and the laser range finder again by using the laser range finder;

step 8, subtracting the distance d2 measured for the second time from the distance d1 measured for the first time to obtain a lead S of alpha/360;

step 9, the lead s= (d 2-d 1) 360/α is determined in step 8

The invention has the advantages and positive effects that:

1. according to the invention, the stator of the screw drilling tool to be measured is arranged on a plurality of groups of stator supporting mechanisms, so that the stator to be measured forms a stable support, and the stator can rotate around the center; clamping and driving the rear end of the stator to be tested through a multi-jaw chuck; the measuring ball is placed in one of the inner spiral grooves from the front end of the stator to be measured, the distance from the measuring ball to the laser range finder in the initial state can be obtained through the measurement of the laser range finder, and after the stator to be measured rotates by a certain angle, the distance from the measuring ball to the laser range finder is measured, the difference between the two distances is combined with the rotating angle, and the lead of the inner spiral of the screw drill stator can be obtained, so that the problem of difficult measurement of the long lead of the inner cavity of the screw drill stator is solved, and the measurement is facilitated.

2. The invention can lead the upper platform to be inclined with a small included angle with a high front and a low rear through the front main support frame, the upper platform forward-tilting driving mechanism and the rear follow-up supporting mechanism, thereby leading the screw drilling tool stator to be tested to be inclined, ensuring that the measuring ball and one side corresponding to the spiral groove are always in a pressing contact device, and ensuring the measuring precision.

Drawings

FIG. 1 is a schematic overall perspective view of the present invention;

FIG. 2 is a perspective reference view of the present invention in an undamped condition after installation of the stator;

FIG. 3 is a side view of the present invention in an undamped condition after installation of the stator;

FIG. 4 is a perspective reference view of the present invention after stator clamping and upper platform tilting forward into place;

FIG. 5 is a reference diagram of the invention for making measurements;

FIG. 6 is a perspective reference view of a three degree of freedom support table of the present invention;

FIG. 7 is a side view of the three degree of freedom support table of the present invention;

FIG. 8 is a cross-sectional view A-A of FIG. 7;

fig. 9 is a perspective view of an up-down direction adjusting part of the three-degree-of-freedom supporting table of the present invention;

FIG. 10 is a front view of an up-down direction adjusting portion of the three degree-of-freedom support table of the present invention;

FIG. 11 is a perspective view of the three degree of freedom support table of the present invention with the up-down adjustment portion of the compression spring shield removed;

FIG. 12 is a perspective view of the front resilient auxiliary support mechanism of the present invention;

fig. 13 is a longitudinal cross-sectional view of the front elastic auxiliary support mechanism of the present invention.

Detailed Description

The structure of the present invention will be further described by way of examples with reference to the accompanying drawings. It should be noted that the present embodiments are illustrative and not restrictive.

An apparatus for measuring the internal spiral lead of a stator of a screw drilling tool by laser, please refer to fig. 1-13, comprises: the device comprises a base plate 1, an upper platform 11, at least two groups of stator supporting mechanisms 5, a sliding table 7, a sliding table driving mechanism 8, a stator rotation driving mechanism 6, a laser range finder 4, a three-degree-of-freedom supporting table 3, a front elastic auxiliary supporting mechanism 2, a front main supporting frame 12, an upper platform forward-tilting driving mechanism 10, a rear follow-up supporting mechanism 9 and a measuring ball 15.

The upper platform is arranged right above the base plate along the front-rear direction. The middle part of the lower end of the upper platform is connected with the base plate through an upper platform forward-tilting driving mechanism, and the position of the lower end of the upper platform close to the front part is hinged with the upper end part of the front main support frame, so that the upper platform can rotate around the hinged connection part. The position of the lower end of the upper platform, which is close to the rear part, is connected with the base plate through a rear follow-up supporting mechanism.

The upper platform forward-tilting driving mechanism comprises a hydraulic cylinder 10.2, an ejector rod 10.1 and a driving frame 10.3 which are vertically arranged. The upper cylinder rod end of the hydraulic cylinder is fixedly connected with the lower end of the ejector rod, the upper end of the ejector rod is connected with the lower end of the driving frame through a pin shaft, and the upper end of the driving frame is fixedly connected with the middle part of the lower end of the upper platform through welding or other common modes.

The front main support comprises a left shaft support leg 12.3, a right shaft support leg 12.4 and two hinge base support legs arranged between the two shaft support legs. The upper ends of the left shaft supporting leg and the right shaft supporting leg are fixedly supported with hinge shafts 12.2, the upper ends of the two hinge seat supporting legs are fixedly provided with two U-shaped hinge seats 12.1, shaft holes are formed in the two U-shaped hinge seats, and the two U-shaped hinge seats are connected with the hinge shafts in a penetrating mode through the shaft holes. Two hinge plates are arranged at the lower end of the upper platform near the front part, shaft holes are arranged on the two hinge plates, the two hinge plates are in rotatable fit with the hinge shaft through the shaft holes, and the two hinge plates are respectively embedded in the two U-shaped hinge seats in a clearance fit manner.

The rear follow-up support mechanism comprises three support slide bars 9.2 and a bottom slide 9.1. The bottom sliding seat is fixed at the position, close to the rear part, of the upper end of the base plate. Three guide sliding grooves 9.1.1 are uniformly distributed on the bottom sliding seat along the circumferential direction, and the three guide sliding grooves extend along the radial direction of the bottom sliding seat. The three guide sliding grooves are preferably, but not limited to, dovetail-shaped guide grooves, and end covers are fixed at the outer ends of the three guide sliding grooves. A sliding block is respectively embedded in the three guide sliding grooves in a sliding mode, the shape of the sliding block is matched with that of the guide sliding groove, and the sliding block is also dovetail-shaped, so that the upper limit, the lower limit and the accurate guide of the sliding block can be realized. And a hinge seat is respectively fixed above the bottom sliding seat at the upper ends of the three sliding blocks and is used for being respectively connected with the lower ends of the three supporting sliding rods. The upper ends of the three support sliding rods are respectively connected with three hinging seats fixed at the lower end of the upper platform and close to the rear part through upper hinging shafts, and the three hinging seats are uniformly distributed on the same circumference and are coaxially arranged up and down with the bottom sliding seat. The lower ends of the three support slide bars are hinged with the hinge seats on the three slide blocks through a lower hinge shaft respectively. The rear follow-up supporting mechanism changes the inclination angles of the three supporting sliding rods along with the change of the height of the rear end part of the upper platform through the sliding of the sliding blocks in the guide sliding grooves, so that the follow-up supporting of the rear part of the upper platform is realized.

The plurality of groups of stator supporting mechanisms are sequentially arranged at the middle front part position above the upper platform along the front and back directions and are used for supporting the stator of the screw drilling tool to be tested. Each group of stator supporting mechanism comprises an H-shaped supporting seat 5.1, a V-shaped groove 5.1.1 is formed in the upper end of two vertical sides of the H-shaped supporting seat, roller bearings 5.2 which are arranged in a V-shaped manner are mounted on the outer sides of the V-shaped grooves on the two vertical sides through bolts, and the upper ends of the roller bearings are higher than the V-shaped grooves. And supporting the screw drilling tool stator to be tested through the roller bearing. The support mode can realize the centering support of the screw drilling tool stator to be tested, and in addition, the rotation of the screw drilling tool stator along the circumferential direction is not limited.

The sliding table is slidably arranged at the middle and rear positions of the upper platform along the front and rear directions and is connected with the sliding table driving mechanism, so that the sliding table is driven along the front and rear directions. Specifically, a guide rail is fixed at the lower end of the sliding table, a guide groove 11.1 along the front-rear direction is arranged at the middle-rear position of the upper end of the upper platform, the guide groove adopts a dovetail groove, the guide rail at the lower end of the sliding table adopts a dovetail-shaped guide rail, and the guide rail is in sliding embedded fit with the guide groove. The sliding table driving mechanism comprises a sliding table driving motor 8.2 and a sliding table driving screw rod 8.3. The sliding table driving motor is fixedly arranged on the upper platform, the output end of the sliding driving motor is connected with the sliding table driving screw rod, and the sliding table driving screw rod is supported at the upper end of the upper platform through screw rod supports positioned at the front end and the rear end. Screw holes along the front-back direction are arranged at the position, close to one side, on the sliding table, and are connected with a driving screw rod through the screw holes. Further, a guiding light hole 8.1 is formed in the position, close to the other side, of the sliding table along the front-rear direction, a guiding light bar is arranged in the guiding light hole in a penetrating mode, two ends of the guiding light bar are fixedly supported on the light bar supporting seats, and the two light bar supporting seats are fixedly connected with the upper end of the upper platform. The guide light bar plays a role in assisting in guiding and supporting the sliding table, and is beneficial to improving the moving stability of the sliding table.

The stator rotation driving mechanism is arranged at the upper end of the sliding table and comprises a servo motor 6.3, a speed reducer 6.2 and a multi-jaw chuck 6.1. The multi-jaw chuck is a four-jaw chuck, the multi-jaw chuck, the speed reducer and the servo motor are sequentially arranged along the front-back direction, the servo motor and the speed reducer are fixedly arranged at the upper end of the sliding table, the output end of the servo motor is connected with the input end of the speed reducer through a first coupling, and the output end of the speed reducer is connected with a central shaft fixed on a chuck body of the multi-jaw chuck through a second coupling and supported through a bearing seat. The multi-jaw chuck is arranged at the rear side of the rearmost group of stator supporting mechanisms, and the center of the multi-jaw chuck and the center of the screw drilling tool stator to be tested supported on the plurality of groups of stator supporting mechanisms are concentrically arranged.

The three-degree-of-freedom supporting table is arranged outside the front end of the upper platform, the lower part of the front end of the upper platform is connected with an L-shaped bracket 14, and the three-degree-of-freedom supporting table is arranged on a transverse supporting plate of the L-shaped bracket. The three-degree-of-freedom supporting table can be adjusted in the front-back direction, the left-right direction and the up-down direction. The three-degree-of-freedom supporting table comprises a bottom fixing plate 3.1, wherein the bottom is fixedly arranged on a transverse supporting plate of an L-shaped bracket through a screw, a front supporting vertical plate 3.3 and a rear supporting vertical plate 3.19 which are oppositely arranged are fixed at the upper end of the bottom fixing plate, a front and rear moving sliding block 3.2 is arranged between the front and rear supporting vertical plates, a threaded hole is formed in the front and rear moving sliding block and is connected with a front and rear moving driving screw rod 3.20 through the threaded hole, a handle is arranged at the outer end of the front and rear moving screw rod, the lower end of the front and rear moving sliding block and the upper end of the bottom fixing plate form guiding fit through a guide rail and a guide chute, and a guide light bar 3.21 matched with the front and rear moving sliding block is fixedly arranged between the front and rear supporting vertical plates. The upper end of the front-back moving sliding block is fixedly provided with a middle moving platform 3.4, and the upper end of the middle moving platform is fixedly provided with a left supporting vertical plate 3.5 and a right supporting vertical plate 3.17 which are oppositely arranged. A left-right moving slide block 3.18 is arranged between the left-right supporting vertical plates, a threaded hole is arranged on the left-right moving slide block and is connected with a left-right moving driving screw rod 3.6 through the threaded hole, a handle is arranged at one end of the left-right moving driving screw rod, the lower end part of the left-right moving slide block and the upper end of the middle moving platform form guiding fit with a guiding chute through a guiding rail, and a guiding light bar 3.16 matched with the left-right moving slide block is fixedly arranged between the left-right supporting vertical plates. An upper moving platform 3.7 is fixed at the upper end of the left-right moving slide block. The front vertical plate 3.8 and the rear vertical plate 3.14 are fixed on the upper moving platform, the front vertical plate and the rear vertical plate are provided with a power input shaft 3.13 and a transmission shaft 3.15 which are arranged along the front-rear direction through bearings, a hand wheel 3.12 is fixed at the exposed end of the front part of the power input shaft, a driving gear 3.23 is arranged on the power input shaft, a first driven gear 3.10 and a second driven gear 3.26 are arranged on the transmission shaft, and the first driven gear is meshed with the driving gear to realize the speed reduction input. The second driven gear meshes with a vertically arranged rack post 3.24 arranged outside one side thereof. The other side of the second driven gear is provided with a vertical guide post 3.25 which is parallel to the rack post, the rack post and the vertical guide post form guide fit with a vertical guide frame 3.9 fixedly installed on the upper moving platform, and a guide rail of the specific accessible dovetail assembly and a matched structure of the dovetail guide groove form guide fit structure. The upper ends of the rack column and the vertical guide column are fixedly provided with a top supporting table 3.11. The laser range finder is installed on the top supporting table in a mode that a measuring head faces backwards. The center of the laser range finder and the center of a measuring ball arranged in one inner spiral groove of the screw drilling tool stator are aligned by adjusting the front and back, left and right and up and down positions of the top supporting table.

The three-freedom supporting table is further provided with a non-return mechanism for preventing the rack column from driving the gear meshing part to rotate reversely under the action of gravity, the non-return mechanism adopts a ratchet and pawl matching mechanism and comprises a ratchet 3.22 and a pawl 3.27, the ratchet is coaxially and fixedly arranged on the power input shaft and is fixed on the pawl shaft, the pawl shaft is arranged on the front vertical plate in a penetrating way, the front end of the pawl shaft is provided with a hand plate rod 3.31 in a penetrating way through a pin rod 3.30, and one end of the pin rod, which is far away from the end which is in wearing matching with the pawl shaft and the hand plate rod, is matched with the elastic pushing mechanism, so that the pawl is matched with the ratchet. The elastic jacking mechanism comprises a pressure spring 3.33, an upper pressure head 3.32 and a jacking rod 3.29, a pressure spring mounting groove 3.8.1 is formed in the front side of the front vertical plate, a spring guide column 3.8.2 is arranged at the bottom of the pressure spring mounting groove, the pressure spring is embedded into the pressure spring mounting groove, the lower end of the pressure spring is sleeved on the pressure spring guide column, the upper pressure head is embedded into the pressure spring mounting groove, the upper pressure head is in pressing contact with the upper end of the pressure spring, and the upper pressure head is in sleeved fit with the upper end of the pressure spring through the spring guide column arranged at the lower end of the pressure spring; the upper end of the upper pressure head is hinged with the lower end of the pressing rod, and the upper end of the pressing rod and one end of the pin rod, which is far away from the ratchet shaft, form vertical fixed connection in a threaded connection mode. The non-return mechanism prevents the power input shaft from automatically reversing by limiting the reversing of the ratchet wheel, thereby preventing the rack column from automatically descending under the action of gravity. When the position of the laser range finder needs to be adjusted downwards, the hand plate rod is manually rotated reversely, so that the pawl is in falling contact with the ratchet wheel, and after the position is adjusted downwards, the manual wrench is loosened, so that the pawl is inserted into the ratchet wheel groove again, and the non-return is realized. In addition, a detachable pressure spring protection cover 3.28 is arranged outside the pressure spring mounting groove through a screw.

The measuring ball is arranged in one of the spiral grooves of the screw drilling tool stator to be measured, and the diameter of the measuring ball is slightly smaller than the width of the inner spiral groove of the screw drilling tool stator. The measuring ball can be a steel ball or a transparent ball filled with fluorescent materials at the inner center point (the alignment of the laser range finder to the center of the ball is facilitated). The glass ball is matched with the laser range finder, so that the detection of the moving distance of the glass ball is realized under the condition that the screw drill stator rotates by a certain angle, and the moving distance is combined with the rotating angle of the screw drill stator, so that the numerical value of the internal spiral lead of the screw drill stator can be obtained.

The front elastic auxiliary supporting mechanism is arranged between the lower part of the transverse supporting plate of the L-shaped bracket and the upper end of the base plate. Comprises a cylindrical base 2.1, a pressure spring 2.4, an upper cover 2.2 and a piston member 2.3. The lower extreme of tubular base is provided with the flange, and the flange passes through screw fixed connection with the bed plate. The bottom of the inner cavity of the cylindrical base is provided with a lower center positioning column 2.1.1 for positioning the lower end part of the pressure spring. The pressure spring is arranged in the inner cavity of the cylindrical base, and the lower end part of the pressure spring is assembled with the lower center positioning column sleeve. The upper cover is provided with a central hole, and the upper cover is fixed at the upper end of the cylindrical base through a screw. The piston member is composed of a connector 2.3.1, a piston rod 2.3.2 and a piston head 2.3.3 which are arranged up and down in sequence. The piston head stretches into the inner cavity of the cylindrical base and forms clearance fit with the inner cavity wall, an upper center positioning column is arranged at the lower part of the piston head, and the upper center positioning column and the upper end part of the pressure spring form sleeved positioning fit. The piston rod of the piston piece penetrates out of the central hole of the upper cover, and the connector of the piston piece is connected with the lower end of the connecting seat fixed below the transverse supporting plate of the L-shaped bracket through a pin shaft.

In addition, the device also comprises a control system for controlling the motor and the hydraulic cylinder.

The method for measuring the internal spiral lead of the screw drilling tool stator by adopting the laser comprises the following steps:

step 1, under the condition that a four-jaw chuck is positioned at a rear end working position, a screw drilling tool stator 13 to be measured is placed on two groups of stator supporting mechanisms, then a measuring ball is placed at the front end of the screw drilling tool stator, the starting end is positioned in a lowest internal spiral groove when the measuring ball is placed at the front end of the screw drilling tool stator, and a laser range finder is fixed to the top of a three-degree-of-freedom supporting table;

step 3, adjusting the three-degree-of-freedom supporting table to enable laser emitted by the laser range finder to be aligned with the spherical position of the measuring ball;

step 4, starting a sliding table driving motor, driving a screw rod to drive a sliding table to move forwards through the sliding table, enabling the sliding table driving motor to stop moving when the rear end of the screw drilling tool stator is inserted into the position between the clamping jaws of the four-jaw chuck in the current open state, and then locking the clamping jaws of the four-jaw chuck to clamp and fix the rear end of the screw drilling tool stator;

step 6, starting a servo motor, and stopping movement when the four-jaw chuck is driven to rotate by a speed reducer to change to alpha degrees, wherein the measuring ball moves backwards in the corresponding spiral groove for a certain distance;

step 9, step 8 shows that the lead s= (d 2-d 1) is 360/α.

If the stator pitch is required, the stator pitch p=s/Z can be found by the relation between the lead and the pitch P, the lead being equal to the product between the pitch and the thread count Z.

Although the embodiments of the present invention and the accompanying drawings have been disclosed for illustrative purposes, those skilled in the art will appreciate that: various substitutions, changes and modifications are possible without departing from the spirit of the invention and the appended claims, and therefore the scope of the invention is not limited to the embodiments and the disclosure of the drawings.

Claims

1. An equipment of spiral helical pitch in laser measurement screw drilling tool stator, its characterized in that: the device comprises a base plate, an upper platform, at least two groups of stator supporting mechanisms, a sliding table driving mechanism, a stator rotation driving mechanism, a laser range finder, a three-degree-of-freedom supporting table, a front main support frame, an upper platform forward-tilting driving mechanism, a rear follow-up supporting mechanism and a measuring ball;

the stator supporting mechanisms are sequentially arranged at the middle front part above the upper platform along the front and back directions; each group of stator supporting mechanism comprises a supporting seat, roller bearings which are arranged in a V-shaped arrangement are arranged at the upper ends of two vertical edges of the supporting seat, and a screw drilling tool stator to be tested is supported through the roller bearings;

the three-degree-of-freedom supporting table is arranged outside the front end of the upper platform, the lower part of the front end of the upper platform is connected with a bracket, and the three-degree-of-freedom supporting table is arranged on a transverse supporting plate of the bracket; the three-degree-of-freedom supporting table is a supporting table capable of being adjusted in the front-back direction, the left-right direction and the up-down direction; the laser range finder is fixedly arranged at the top of the three-degree-of-freedom supporting table in a mode that a measuring head faces backwards;

the measuring ball is used for being placed in one inner spiral groove of the screw drilling tool stator to be measured in a clearance fit mode.

2. The apparatus for laser measuring the internal helical lead of a progressive cavity drilling tool stator of claim 1, wherein: the front elastic auxiliary supporting mechanism is arranged between the lower part of the transverse supporting plate of the bracket and the upper end of the base plate; the device comprises a cylindrical base, a pressure spring, an upper cover and a piston piece, wherein the lower end of the cylindrical base is fixedly connected with a base plate nail; a lower central positioning column is arranged at the bottom of the inner cavity of the cylindrical base, the pressure spring is arranged in the inner cavity of the cylindrical base, and the lower end part of the pressure spring is sleeved with the lower central positioning column; the upper cover is provided with a central hole and is fixed at the upper end of the cylindrical base; the piston part consists of a connector, a piston rod and a piston head which are arranged up and down in sequence; the piston head stretches into the inner cavity of the cylindrical base and forms clearance fit with the inner cavity wall, an upper center positioning column is arranged at the lower part of the piston head, and the upper center positioning column and the upper end part of the pressure spring form fit positioning fit; the piston rod of the piston piece penetrates out of the central hole of the upper cover, and the connector of the piston piece is connected with the lower end of the connecting seat fixed below the transverse supporting plate of the bracket through a pin shaft.

3. The apparatus for laser measuring the internal helical lead of a progressive cavity drilling tool stator of claim 1, wherein: the upper platform forward-tilting driving mechanism comprises a hydraulic cylinder, a push rod and a driving frame which are vertically arranged; the upper cylinder rod end of the hydraulic cylinder is fixedly connected with the lower end of the ejector rod, the upper end of the ejector rod is connected with the lower end of the driving frame through a pin shaft, and the upper end of the driving frame is fixedly connected with the middle part of the lower end of the upper platform.

4. The apparatus for laser measuring the internal helical lead of a progressive cavity drilling tool stator of claim 1, wherein: the front main support comprises a left shaft support leg, a right shaft support leg and two hinging seat support legs arranged between the two shaft support legs; hinge shafts are fixedly supported at the upper ends of the left shaft supporting leg and the right shaft supporting leg, two U-shaped hinge seats are fixedly arranged at the upper ends of the two hinge seat supporting legs, shaft holes are formed in the two U-shaped hinge seats, and the two U-shaped hinge seats are connected with the hinge shafts in a penetrating manner through the shaft holes; two hinge plates are arranged at the lower end of the upper platform near the front part, shaft holes are arranged on the two hinge plates, the two hinge plates are in rotatable fit with the hinge shaft through the shaft holes, and the two hinge plates are respectively embedded in the two U-shaped hinge seats in a clearance fit manner.

5. The apparatus for laser measuring the internal helical lead of a progressive cavity drilling tool stator of claim 1, wherein: the rear follow-up supporting mechanism comprises three supporting sliding rods and a bottom sliding seat; the bottom sliding seat is fixed at the position, close to the rear part, of the upper end of the base plate; three guide sliding grooves are uniformly distributed on the bottom sliding seat along the circumferential direction, the three guide sliding grooves extend along the radial direction of the bottom sliding seat, and an end cover is fixed at the outer ends of the three guide sliding grooves; a sliding block limited in the up-down direction is respectively and slidably embedded in the three guide sliding grooves, and a hinging seat is respectively fixed above the bottom sliding seat at the upper ends of the three sliding blocks; the upper ends of the three support sliding rods are respectively connected with three hinging seats fixed at the lower end of the upper platform and close to the rear part through upper hinging shafts, and the three hinging seats are uniformly distributed on the same circumference and are coaxially arranged up and down with the bottom sliding seat; the lower ends of the three support slide bars are hinged with the hinge seats on the three slide blocks through a lower hinge shaft respectively.

6. The apparatus for laser measuring the internal helical lead of a progressive cavity drilling tool stator of claim 1, wherein: a dovetail-shaped guide rail is fixed at the lower end of the sliding table, a dovetail-shaped guide groove along the front-back direction is arranged at the middle-back position of the upper end of the upper platform, and the guide rail is in sliding embedded fit with the guide groove; the sliding table driving mechanism comprises a sliding table driving motor and a sliding table driving screw rod; the sliding table driving motor is fixedly arranged on the upper platform, the output end of the sliding driving motor is connected with a sliding table driving screw rod, and the sliding table driving screw rod is supported at the upper end of the upper platform through screw rod supports positioned at the front end and the rear end; screw holes along the front-back direction are arranged at the position, close to one side, on the sliding table, and are connected with a driving screw rod through the screw holes.

7. The apparatus for laser measuring the internal helical lead of a progressive cavity drilling tool stator of claim 1, wherein: the three-degree-of-freedom supporting table comprises a bottom fixed plate, a middle moving platform, an upper moving platform and a top supporting table; the bottom fixing plate is fixed on the transverse supporting plate of the bracket; the middle moving plate is arranged above the bottom fixed plate, the upper moving platform is arranged above the middle moving platform, and the top supporting platform is arranged above the upper moving platform; a front-back movement driving mechanism is arranged between the middle moving platform and the bottom fixing plate, a left-right movement driving mechanism is arranged between the upper moving platform and the middle moving platform, and the front-back movement driving mechanism and the left-right movement driving mechanism both adopt screw nut transmission mechanisms; the upper moving platform is connected with the top supporting platform through a vertical moving driving mechanism.

8. The apparatus for laser measuring the internal helical lead of a progressive cavity drilling tool stator of claim 7, wherein: the vertical movement driving mechanism comprises a front vertical plate and a rear vertical plate which are fixed on the upper moving platform; a power input shaft and a transmission shaft which are arranged along the front-rear direction are arranged on the front vertical plate and the rear vertical plate through bearings, a hand wheel is fixed at the exposed end of the front part of the power input shaft, a driving gear is arranged on the power input shaft, a first driven gear and a second driven gear are arranged on the transmission shaft, and the first driven gear is meshed with the driving gear; the second driven gear is meshed with a vertically arranged rack column arranged outside one side of the second driven gear; the other side of the second driven gear is provided with a vertical guide column which is parallel to the rack column, the rack column and the vertical guide column form guiding cooperation along the up-down direction with a vertical guide frame fixedly arranged on the upper moving platform, and the upper ends of the rack column and the vertical guide column are fixedly connected with the top supporting table.

9. The apparatus for laser measuring the internal helical lead of a progressive cavity drilling tool stator of claim 8, wherein: the three-freedom supporting table is also provided with a non-return mechanism, the non-return mechanism adopts a ratchet and pawl matching mechanism and comprises a ratchet and a pawl, the ratchet is coaxially and fixedly arranged on a power input shaft, the pawl is fixedly arranged on a pawl shaft, the pawl shaft is arranged on a front vertical plate in a penetrating way, the front end of the pawl shaft is provided with a hand plate rod in a penetrating way through a pin rod, and the pin rod is matched with an elastic pushing mechanism at one end far away from the end matched with the pawl shaft and the hand plate rod in a wearing way, so that the pawl is matched with the ratchet; the elastic jacking mechanism comprises a pressure spring, an upper pressure head and a jacking rod; the front side of the front vertical plate is provided with a pressure spring mounting groove, the bottom of the pressure spring mounting groove is provided with a spring guide column, the pressure spring is embedded into the pressure spring mounting groove, the lower end of the pressure spring is sleeved on the pressure spring guide column, the upper pressure head is embedded into the pressure spring mounting groove, the upper pressure head is in pressing contact with the upper end of the pressure spring, and the upper pressure head and the upper end of the pressure spring form sleeved fit through the spring guide column arranged at the lower end of the pressure spring; the upper end of the upper pressure head is hinged with the lower end of the pressing rod, and the upper end of the pressing rod and one end of the pin rod, which is far away from the ratchet shaft, form vertical fixed connection in a threaded connection mode.

10. A method of measuring an apparatus for measuring the internal helical lead of a progressive cavity drilling tool stator based on a laser as claimed in any one of claims 1 to 9, comprising the steps of:

step 9, step 8 shows that the lead s= (d 2-d 1) is 360/α.