A straightening device for gun-drill shanks

Abstract

The utility model provides a kind of straightening device of gun drill drill rod, it is related to gun drill drill rod processing technical field, it includes chassis, marble ruler, positioning clamping mechanism, locking handle and mobile straightening mechanism;Chassis is installed with the marble ruler of straightening reference datum, the right side of marble ruler is installed with positioning clamping mechanism, mobile straightening mechanism is installed on chassis, and locking handle is fixed with positioning clamping mechanism on chassis;Adjuster is provided in positioning clamping mechanism, and there are three guide holes in the equidistant array of the positioning ring of adjuster, three guide holes are respectively provided with centering axle, and gun drill drill rod clamping and positioning are realized using three centering axles;Push rod is provided in mobile straightening mechanism, push rod is composed of measuring scale and driving shaft, the end of driving shaft is connected with micrometer, and the straightness of gun drill drill rod is reflected using the fluctuation of measuring scale and the numerical change of micrometer, and straightening device is convenient to operate, flexible and reliable and applicable to different specifications.

Description

Technical Field

[0001] This utility model relates to the field of gun drill rod processing technology, and in particular to a straightening device for gun drill rods. Background Technology

[0002] Gun drills, as an important tool for deep hole machining, work by supplying cutting fluid to the cutting area through the cooling channels inside the tool, while the cutting fluid and chips are discharged through the V-shaped channel formed between the machined hole and the drill rod.

[0003] Gun drills mainly consist of three parts: the drill bit, the drill rod, and the tool holder. As a crucial component of the gun drill, the drill rod is typically made of seamless steel pipe, and its straightness directly affects the quality of the machined hole. However, current technology lacks a dedicated device for straightening drill rods, relying solely on manual straightening using a marble straightedge, which easily leads to deviations from tolerances. Utility Model Content

[0004] This invention addresses the problems in the prior art by providing a straightening device that is easy to operate, flexible, reliable, and applicable to drill pipes of different specifications.

[0005] The technical solution adopted in this utility model is:

[0006] A straightening device for a gun drill rod, comprising:

[0007] The base frame has internal support columns and hollow columns arranged parallel to each other along the length of the base frame.

[0008] A marble straightedge is installed on the support column;

[0009] A positioning and clamping mechanism is installed on the hollow column to clamp and position the gun drill rod;

[0010] A movable straightening mechanism is installed on the base frame and located below the positioning and clamping mechanism, and is used to straighten the straightness of the drill rod of the gun drill.

[0011] A locking handle is attached to the hollow column and is used to fix the positioning and clamping mechanism.

[0012] Furthermore, the positioning and clamping mechanism includes:

[0013] The regulator has a column inside, which is inserted into the hollow column. A positioning ring is connected to the top of the column, and a guide hole is opened on the positioning ring.

[0014] A centering shaft is inserted into the guide hole;

[0015] The guide hole is threaded, and the centering shaft is threaded to mate with the guide hole.

[0016] Furthermore, the positioning and clamping mechanism also includes:

[0017] Two sliding seats are connected to the outside of the positioning ring and symmetrically arranged on both sides of the centering shaft;

[0018] A motor bracket is installed between the two sliding seats, and a motor shaft hole is provided inside the bracket, through which the centering shaft is inserted.

[0019] The clamping motor is installed in the motor bracket, and its output end is fixedly connected to the centering shaft.

[0020] Furthermore, the guide holes are arranged in a circumferentially spaced array of three;

[0021] A centering shaft is inserted through each of the aforementioned guide holes;

[0022] The three centering shafts clamp and position the drill rod of the gun drill.

[0023] Furthermore, the sliding seat, the motor bracket, and the clamping motor are matched with the centering shaft and are arranged at equal intervals along the circumference of the positioning ring.

[0024] Furthermore, grooves are provided on the opposite side walls of the two sliding seats;

[0025] The motor bracket has first sliders formed on both sides of its side walls;

[0026] The first slider engages with and is slidably connected to the groove.

[0027] Furthermore, the mobile alignment mechanism includes:

[0028] The guide rail is mounted on the base frame, and its two ends are respectively connected to the side wall of the hollow column;

[0029] The straightening slider is slidably connected to the guide rail;

[0030] A push rod bracket is installed on the straightening slider, and a sleeve is provided inside it;

[0031] A push rod, which has a drive shaft inside, and the drive shaft passes through the sleeve;

[0032] A dial indicator is installed at the end of the drive shaft, and its working end contacts the marble straightedge;

[0033] A return spring is sleeved on the drive shaft, with one end abutting against the push rod and the other end abutting against the sleeve.

[0034] Furthermore, limit grooves are provided at both ends of the inner side of the sleeve in the same diameter direction;

[0035] A second slider that mates with the limiting groove is formed on the side wall of the drive shaft;

[0036] The second slider is slidably connected in the limiting groove.

[0037] Furthermore, a pin hole is provided at the end of the drive shaft;

[0038] A connecting pin is formed on the side wall of the dial indicator;

[0039] The connecting pin mates with the pin hole.

[0040] Furthermore, a measuring scale is provided at the end of the drive shaft away from the dial indicator, and the side wall of the measuring scale contacts the drill rod of the gun drill.

[0041] The beneficial effects of this utility model are:

[0042] 1. The positioning and clamping mechanism is equipped with an adjuster. The positioning ring of the adjuster has three guide holes arranged at equal intervals along the circumference. A centering shaft is inserted into each of the three guide holes. The other end of the centering shaft is fixedly connected to a clamping motor. By rotating the clamping motor forward and backward, the centering shaft is driven to slide in the guide holes. The three centering shafts are used to clamp and position the gun drill rod, making clamping flexible and convenient, and positioning accurate.

[0043] 2. The moving straightening mechanism is equipped with a guide rail, on which a straightening slider is mounted. The straightening slider is equipped with a push rod, which consists of a measuring scale and a drive shaft. The measuring scale contacts the surface of the drill rod, and the end of the drive shaft is connected to a dial indicator. The working end of the dial indicator contacts the reference surface of the marble straightedge. The straightening slider drives the measuring scale to slide axially on the drill rod. The straightness of the drill rod is reflected by the fluctuation of the measuring scale and the change of the dial indicator value. The measurement operation is simple and the straightening accuracy is reliable. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 This is a three-dimensional structural diagram of the straightening device in this utility model.

[0046] Figure 2This is a three-dimensional structural diagram of the base frame in the straightening device.

[0047] Figure 3 This is a three-dimensional structural diagram of the positioning and clamping mechanism in the straightening device.

[0048] Figure 4 for Figure 3 A magnified view of part A of the central positioning and clamping mechanism.

[0049] Figure 5 This is an exploded view of the moving straightening mechanism in the straightening device.

[0050] Figure 6 This is a three-dimensional structural diagram of the push rod support in the moving straightening mechanism.

[0051] Marked in the image:

[0052] 1. Base frame; 11. Base frame main body; 12. Support column; 13. Hollow column; 14. Locking hole;

[0053] 2. Marble straight edge;

[0054] 3. Positioning and clamping mechanism; 31. Adjuster; 311. Column; 312. Positioning ring; 313. Guide hole; 32. Sliding seat; 321. Vertical plate; 322. Arc plate; 323. Slide groove; 33. Centering shaft; 34. Motor bracket; 341. First slider; 342. Motor shaft hole; 35. Clamping motor;

[0055] 4. Lock the handle;

[0056] 5. Moving straightening mechanism; 51. Guide rail; 52. Straightening slider; 53. Push rod; 531. Measuring ruler; 532. Drive shaft; 533. Second slider; 534. Pin hole; 54. Return spring; 55. Push rod bracket; 551. Bracket body; 5511. Fixing plate; 5512. Connecting plate; 552. Rib plate; 553. Outer support; 554. Sleeve; 555. Limiting groove; 56. Dial indicator; 561. Connecting pin;

[0057] 6. Gun drill rod. Detailed Implementation

[0058] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0059] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this invention.

[0060] The embodiments of the utility model will now be described in detail with reference to the accompanying drawings.

[0061] This embodiment provides a straightening device for a gun drill rod, referring to... Figure 1 It includes a base frame 1, a marble straightedge 2, two positioning and clamping mechanisms 3, two locking handles 4, and a moving straightening mechanism 5. The marble straightedge 2 is installed on the top of the base frame 1 as a reference for measuring the straightness of the drill rod 6; the positioning and clamping mechanism 3 and the moving straightening mechanism 5 are installed on the right side of the marble straightedge 2, and the moving straightening mechanism 5 is located below the positioning and clamping mechanism 3.

[0062] The drill rod 6 of the gun drill passes through two positioning and clamping mechanisms 3. A hollow column 13 is formed on the right side of the base frame 1. An adjuster 31 is provided in the positioning and clamping mechanism 3. The adjuster 31 is inserted into the hollow column 13. The locking handle 4 is installed on the side wall of the hollow column 13 away from the marble ruler 2. Its end passes through the side wall of the hollow column 13 and abuts against the adjuster 31, thereby locking the adjuster 31 and fixing the positioning and clamping mechanism 3 on the base frame 1.

[0063] The mobile straightening mechanism 5 is equipped with a dial indicator 56, which is in contact with the reference surface of the marble straightedge 2. The position of the drill rod 6 that is not straight is determined by the change of the dial indicator 56, providing data reference for straightening.

[0064] The three-dimensional structure of the base frame 1 in the straightening device is as follows: Figure 2 As shown in the figure, the base frame 1 mainly consists of a base frame body 11, support columns 12, and hollow columns 13. The base frame body 11 is a rectangular frame structure, with two support columns 12 and two hollow columns 13 respectively arranged along its length at the top. Figure 1The directions shown are explained as follows: the two support columns 12 are located on the left side of the base frame body 11, respectively set at the front and rear ends of the base frame body 11; the two hollow columns 13 are located on the right side of the base frame body 11, also respectively set at the front and rear ends of the base frame body 11.

[0065] The tops of the two support columns 12 are provided with threaded holes, and the marble straightedge 2 is provided with through holes, the positions of which correspond to the threaded holes. The marble straightedge 2 is fixed to the support columns 12 with bolts. The hollow column 13 has a locking hole 14 on its side wall away from the support column 12. The locking hole 14 passes through the side wall of the hollow column 13 and is threaded inside. The locking handle 4 is threaded to match the locking hole 14 and passes through the locking hole 14.

[0066] The positioning and clamping mechanism 3 is equipped with an adjuster 31, and the column 311 of the adjuster 31 is inserted into the hollow column 13. By turning the locking handle 4, its end gradually presses against the column 311, thereby fixing the adjuster 31 in the hollow column 13. When it is necessary to change the height of the adjuster 31, loosen the locking handle 4 and move the column 311 up or down, and then turn the locking handle 4 again to fix the adjuster 31.

[0067] The straightening device is equipped with two positioning and clamping mechanisms 3 for clamping the drill rod 6 of the gun drill. The three-dimensional structure of the positioning and clamping mechanism 3 is as follows: Figure 3 As shown. The positioning and clamping mechanism 3 mainly includes an adjuster 31, a sliding seat 32, a centering shaft 33, a motor bracket 34, and a clamping motor 35. The adjuster 31 mainly consists of a column 311 and a positioning ring 312. The cross-sectional dimensions of the column 311 match the inner dimensions of the hollow column 13 on the base frame 1. A positioning ring 312 is provided on the top of the column 311. Three guide holes 313 are arranged in a circumferentially evenly spaced array on the side wall of the positioning ring 312. Threads are machined in the guide holes 313. Threads that mate with the guide holes 313 are machined on the centering shaft 33. One end of the centering shaft 33 is inserted into the guide hole 313.

[0068] Combination Figure 4 It can be seen that two sliding seats 32 are welded to the outer side of the positioning ring 312, and the two sliding seats 32 are symmetrically arranged on both sides of the centering shaft 33. The sliding seat 32 is composed of a vertical plate 321 and an arc-shaped plate 322. The arc-shaped plate 322 is connected to the bottom of the vertical plate 321, and the surface of the arc-shaped plate 322 away from the vertical plate 321 is in contact with the outer arc surface of the positioning ring 312. A sliding groove 323 is machined on the side wall of the vertical plate 321 facing each other, and the sliding groove 323 runs through the upper and lower ends of the vertical plate 321.

[0069] The motor bracket 34 has a U-shaped groove structure and is installed between two sliding seats 32. A motor shaft hole 342 is located at the center of its bottom, and threaded holes are formed around the motor shaft hole 342. The clamping motor 35 is fixed to the motor bracket 34 with bolts. The centering shaft 33 passes through the motor shaft hole 342 and is fixedly connected to the output end of the clamping motor 35. The clamping motor 35 is connected to an external power supply. First sliders 341 are formed on the outer sides of both side walls of the motor bracket 34. The first sliders 341 cooperate with the sliding grooves 323 on the sliding seats 32 and can slide up and down within the sliding grooves 323. The sliding seats 32, centering shaft 33, motor bracket 34, and clamping motor 35 are matched with guide holes 313 on the positioning ring 312. Three sets of guide holes 313 are equally spaced along the circumferential direction on the outer side of the positioning ring 312.

[0070] Combination Figure 1 , Figure 3 and Figure 4 It can be seen that when the positioning and clamping mechanism 3 is working, the three clamping motors 35 installed on the outside of the positioning ring 312 rotate in the forward direction at the same time. The output ends of the three clamping motors 35 drive the corresponding centering shafts 33 to rotate synchronously. The centering shafts 33 are connected to the guide hole 313 by threads. The rotation of the three centering shafts 33 drives the corresponding motor brackets 34 and clamping motors 35 to move towards the center of the positioning ring 312. The ends of the three centering shafts 33 clamp the gun drill rod 6 in the positioning ring 312 and make the axis of the gun drill rod 6 coincide with the axis of the positioning ring 312, thereby realizing the positioning of the gun drill rod 6 in the positioning ring 312.

[0071] Three clamping motors 35 rotate simultaneously in opposite directions, synchronously driving the corresponding centering shafts 33 to rotate. The three centering shafts 33 then drive the corresponding motor brackets 34 and clamping motors 35 to move away from the center of the positioning ring 312. The three centering shafts 33 release the gun drill rod 6, allowing it to be removed from the positioning ring 312. By driving the three centering shafts 33 through the clamping motors 35, the positioning and clamping mechanism 3 becomes flexible and adjustable, enabling the clamping and positioning of gun drill rods 6 of different specifications.

[0072] The straightening device also includes a movable straightening mechanism 5, the three-dimensional structure of which is as follows: Figure 5 As shown. The movable straightening mechanism 5 includes a guide rail 51, a straightening slider 52, a push rod 53, a return spring 54, a push rod bracket 55, and a dial indicator 56. See also Figure 1 As can be seen, the guide rail 51 is mounted on the base frame 1 and located between the two hollow columns 13. The two ends of the guide rail 51 are connected to the side walls of the two hollow columns 13 respectively. A straightening slider 52 is mounted on the guide rail 51, and a push rod bracket 55 is mounted on the top of the straightening slider 52.

[0073] The three-dimensional structure of the push rod bracket 55 is as follows Figure 6As shown, the push rod bracket 55 mainly consists of a bracket body 551, a stiffening plate 552, an outward support 553, and a sleeve 554. The bracket body 551 of the push rod bracket 55 has an L-shaped structure, which is composed of a fixing plate 5511 and a connecting plate 5512. The fixing plate 5511 has four symmetrically distributed through holes, and the push rod bracket 55 is bolted to the straightening slider 52. The bottom of the connecting plate 5512 is connected to the fixing plate 5511, and the top of the connecting plate 5512 is provided with a sleeve 554.

[0074] An extended support 553 is provided on the side of the connecting plate 5512 away from the fixed plate 5511. The extended support 553 is also an L-shaped structure, and its other end is connected to the sleeve 554. A stiffening plate 552 is provided on the side of the connecting plate 5512 away from the extended support 553. One end of the stiffening plate 552 is connected to the fixed plate 5511, and the other end is connected to the connecting plate 5512. Limiting grooves 555 are respectively machined at both ends of the same diameter direction inside the sleeve 554, and the limiting grooves 555 pass through the front and rear ends of the sleeve 554.

[0075] like Figure 5 As shown, a push rod 53 is inserted through the sleeve 554. The push rod 53 mainly consists of a measuring scale 531 and a drive shaft 532. The measuring scale 531 is a long strip-shaped plate, and the drive shaft 532 is connected to the bottom of one side. The outer diameter of the drive shaft 532 is the same as the inner diameter of the sleeve 554. Second sliders 533 are formed on both sides of the drive shaft 532 to prevent the push rod 53 from rotating in the sleeve 554. The second sliders 533 cooperate with the limiting groove 555 and can slide in the limiting groove 555.

[0076] A pin hole 534 is provided at the end of the drive shaft 532 away from the measuring scale 531. A connecting pin 561 is provided on the side wall of the dial indicator 56. The connecting pin 561 cooperates with the pin hole 534, and the connection pin 561 is inserted into the pin hole 534 to connect the drive shaft 532 and the dial indicator 56. The working end of the dial indicator 56 is in contact with the reference surface of the marble straightedge 2. A return spring 54 is also sleeved on the drive shaft 532. One end of the return spring 54 abuts against the measuring scale 531, and the other end abuts against the sleeve 554. The side of the measuring scale 531 away from the drive shaft 532 is in contact with the surface of the gun drill rod 6. The measuring scale 531 can slide along the axial direction of the gun drill rod 6 under the action of the straightening slider 52.

[0077] Therefore, when the straightening slider 52 is pushed by hand to slide on the guide rail 51, it simultaneously drives the push rod bracket 55, push rod 53 and dial indicator 56 to move. The measuring scale 531 of the push rod 53 contacts the surface of the gun drill rod 6 and moves along the axial direction of the drill rod. When the gun drill rod 6 is not straight, the measuring scale 531 will fluctuate. The measuring scale 531 will push the drive shaft 532 to slide in the sleeve 554 towards the marble straight ruler 2. The drive shaft 532 drives the dial indicator 56 installed at its end to move. The working end of the dial indicator 56 contacts the reference surface of the marble straight ruler 2, while the marble straight ruler 2 is fixed. The working end of the dial indicator 56 is subjected to pressure, causing the value of the dial indicator 56 to change, thereby measuring the position of the gun drill rod 6 that is not straight and marking it.

[0078] The working principle of a straightening device for gun drill rods is as follows:

[0079] First, the marble straightedge 2 is installed on the support column 12 of the base frame 1. The adjusters 31 of the two positioning clamping mechanisms 3 are respectively installed on the hollow columns 13 at both ends of the base frame 1, and the side of the marble straightedge 2 serving as the straightening reference faces the two positioning clamping mechanisms 3. The guide rail 51 of the moving straightening mechanism 5 is installed on the base frame 1, and both ends of the guide rail 51 are connected to the hollow columns 13 at both ends of the base frame 1.

[0080] Subsequently, the drill rod 6 of the gun drill is inserted into the positioning ring 312, and at the same time, the three clamping motors 35 installed on the outside of the positioning ring 312 are driven to rotate in the forward direction. The output ends of the three clamping motors 35 respectively drive the corresponding centering shafts 33 to rotate synchronously. The centering shafts 33 are connected to the guide hole 313 by threads.

[0081] The rotation of the three centering shafts 33 drives the corresponding motor brackets 34 and clamping motors 35 to move towards the center of the positioning ring 312. The ends of the three centering shafts 33 clamp the drill rod 6 in the positioning ring 312 and make the axis of the drill rod 6 coincide with the axis of the positioning ring 312, thereby realizing the positioning of the drill rod 6 in the positioning ring 312.

[0082] Then, the measuring scale 531 of the push rod 53 is brought into contact with the outer surface of the gun drill rod 6, while the working end of the dial indicator 56 is brought into contact with the reference surface of the marble straightedge 2. When the straightening slider 52 is pushed by hand to slide on the guide rail 51, the push rod bracket 55, the push rod 53, and the dial indicator 56 are moved simultaneously. When the gun drill rod 6 is not straight, the measuring scale 531 will fluctuate. The measuring scale 531 will then push the drive shaft 532 to slide in the sleeve 554 toward the marble straightedge 2. The drive shaft 532 will drive the dial indicator 56 installed at its end to move, while the marble straightedge 2 remains stationary. The working end of the dial indicator 56 is subjected to pressure, causing the dial indicator 56 reading to change, thereby measuring and marking the position where the gun drill rod 6 is not straight.

[0083] Finally, the three clamping motors 35 are simultaneously driven to rotate in opposite directions, synchronously driving the corresponding centering shafts 33 to rotate. The three centering shafts 33 then drive the corresponding motor brackets 34 and clamping motors 35 to move away from the center of the positioning ring 312. The ends of the three centering shafts 33 release the gun drill rod 6 and remove it from the positioning ring 312. The marked positions of the gun drill rod 6 are straightened using a single-arm hydraulic press, and then measured again using a straightening device. The above steps are repeated until the straightness of the drill rod meets the requirements.

[0084] The above embodiments are merely a more detailed description of the present utility model. For those skilled in the art, modifications or equivalent substitutions can still be made to the technical solutions in the foregoing embodiments. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model patent.

Claims

1. A straightening device for a gun drill rod, characterized in that, include: The base frame has internal support columns and hollow columns arranged parallel to each other along the length of the base frame. A marble straightedge is installed on the support column; A positioning and clamping mechanism is installed on the hollow column to clamp and position the gun drill rod; A movable straightening mechanism is installed on the base frame and located below the positioning and clamping mechanism, and is used to straighten the straightness of the drill rod of the gun drill. A locking handle is attached to the hollow column and is used to fix the positioning and clamping mechanism.

2. The straightening device according to claim 1, characterized in that, The positioning and clamping mechanism includes: The regulator has a column inside, which is inserted into the hollow column. A positioning ring is connected to the top of the column, and a guide hole is opened on the positioning ring. A centering shaft is inserted into the guide hole; The guide hole is threaded, and the centering shaft is threaded to mate with the guide hole.

3. The straightening device according to claim 2, characterized in that, The positioning and clamping mechanism further includes: Two sliding seats are connected to the outside of the positioning ring and symmetrically arranged on both sides of the centering shaft; A motor bracket is installed between the two sliding seats, and a motor shaft hole is provided inside the bracket, through which the centering shaft is inserted. The clamping motor is installed in the motor bracket, and its output end is fixedly connected to the centering shaft.

4. The straightening device according to claim 2, characterized in that: The guide holes are arranged in a circumferentially spaced array of three; A centering shaft is inserted through each of the aforementioned guide holes; The three centering shafts clamp and position the drill rod of the gun drill.

5. The straightening device according to claim 3, characterized in that: The sliding seat, the motor bracket, and the clamping motor are matched with the centering shaft and are arranged at equal intervals along the circumference of the positioning ring.

6. The straightening device according to claim 3, characterized in that: Sliding grooves are provided on the opposite side walls of the two sliding seats; The motor bracket has first sliders formed on both sides of its side walls; The first slider engages with and is slidably connected to the groove.

7. The straightening device according to claim 1, characterized in that, The mobile alignment mechanism includes: The guide rail is mounted on the base frame, and its two ends are respectively connected to the side wall of the hollow column; The straightening slider is slidably connected to the guide rail; A push rod bracket is installed on the straightening slider, and a sleeve is provided inside it; A push rod, which has a drive shaft inside, and the drive shaft passes through the sleeve; A dial indicator is installed at the end of the drive shaft, and its working end contacts the marble straightedge; A return spring is sleeved on the drive shaft, with one end abutting against the push rod and the other end abutting against the sleeve.

8. The straightening device according to claim 7, characterized in that: Limiting grooves are provided at both ends of the same diameter direction on the inner side of the sleeve; A second slider that mates with the limiting groove is formed on the side wall of the drive shaft; The second slider is slidably connected in the limiting groove.

9. The straightening device according to claim 7, characterized in that: The end of the drive shaft is provided with a pin hole; A connecting pin is formed on the side wall of the dial indicator; The connecting pin mates with the pin hole.

10. The straightening device according to claim 9, characterized in that: A measuring scale is provided at the end of the drive shaft away from the dial indicator, and the side wall of the measuring scale is in contact with the drill rod of the gun drill.

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