CN213606667U

CN213606667U - Elbow pipe grinding tool with angle-adjustable tool bit and turning control mechanism thereof

Info

Publication number: CN213606667U
Application number: CN202021243677.5U
Authority: CN
Inventors: 郭毅军; 杨雨烟; 王浸宇
Original assignee: Chongqing Xishan Science and Technology Co Ltd
Current assignee: Chongqing Xishan Science and Technology Co Ltd
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2021-07-06
Anticipated expiration: 2030-06-30

Abstract

The utility model discloses a tool bit angularly adjustable return bend grinding tool and diversion control mechanism thereof, diversion control mechanism includes diversion control lever and diversion actuating mechanism, the diversion control lever be with outer cutter pipe main part assorted bending shape, the diversion control lever is worn to establish in outer cutter pipe main part and can be for outer cutter pipe main part axial back-and-forth movement, the diversion control lever includes the first control tube and the straight linear second control tube of bending shape, first control tube is connected through first swing joint structure with the second control tube, first swing joint mechanism makes first control tube and second control tube can follow the radial relative movement each other of outer cutter pipe main part. The direction-changing control mechanism of the elbow grinding cutter of the utility model has the advantages that the main body of the outer cutter tube is in the curved shape, so that the outer cutter tube can more smoothly reach the operation part during the specific operation, and the operation is convenient; moreover, because the first control tube and the second control tube are rigid structures, compared with a flexible tube, the vibration of the cutter head during operation can be reduced, and the control precision is higher.

Description

Elbow pipe grinding tool with angle-adjustable tool bit and turning control mechanism thereof

Technical Field

The utility model relates to the technical field of medical equipment, especially, relate to a return bend grinding tool of tool bit angularly adjustable and diversion control mechanism thereof.

Background

In some bone surgeries, it is sometimes necessary to grind bone tissue in a patient using a grinding tool, and existing grinding tools generally include a shaft portion and a spherical or cylindrical head portion provided at a front end of the shaft portion. The head of the earliest grinding cutter can not be bent, the working area is small, and the earliest grinding cutter is suitable for a few types of operations. In order to solve the defects, a grinding tool with an adjustable head bending angle is provided, and the grinding tool comprises an outer tool tube, an inner tool bar arranged in the outer tool tube, a grinding head movably matched and connected with the front end of the inner tool bar, and an angle adjusting mechanism for adjusting the bending angle between the grinding head and the inner tool bar. The outer knife pipe and the inner knife rod of the grinding knife with the adjustable head bending angle are both linear, and when certain specific operations (such as spine operations) are carried out, some narrow parts or side grinding heads cannot smoothly reach the operation parts. In order to solve the problem, the prior art discloses a curved medical abrasive drilling bit, which comprises a curved sheath and a flexible soft cutter bar arranged in the sheath, wherein the cutter bar is used for controlling the direction change of a cutter head. Because the cutter arbor is soft, the rigidity is not good enough, the tool bit shake is big during the operation, and control accuracy is low moreover.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned prior art current situation, the utility model aims to solve the technical problem that a return bend grinding cutter's of tool bit shake diversion control mechanism during reducible operation is provided. The utility model aims to solve another technical problem that a return bend grinding tool of above-mentioned diversion control mechanism's tool bit angularly adjustable is provided to the shake of tool bit when reducing the operation.

In order to solve the technical problem, the utility model provides a turning control mechanism of return bend grinding cutter, return bend grinding cutter includes: an outer cutter tube assembly including a curved outer cutter tube main body, a support sleeve, and a first hinge mechanism provided between a front end of the outer cutter tube main body and a rear end of the support sleeve, the first hinge mechanism allowing the support sleeve and the outer cutter tube main body to rotate relative to each other about a first hinge rotation axis; the turning control mechanism comprises a turning control rod and a turning driving mechanism, the turning control rod is in a bent shape matched with the outer cutter pipe main body, the turning control rod penetrates through the outer cutter pipe main body and can move back and forth relative to the outer cutter pipe main body in the axial direction, the turning control rod comprises a first curved control pipe and a second straight control pipe which are sequentially connected from front to back or from back to front, the first control pipe is connected with the second control pipe through a first movable connecting structure, and the first movable connecting mechanism enables the first control pipe and the second control pipe to move relative to each other in the radial direction of the outer cutter pipe main body.

The utility model discloses a turn control mechanism of return bend grinding cutter, because outer cutter pipe main part is the bending, can reach the operation position, convenient operation more smoothly when specific operation. Moreover, because the first control tube and the second control tube are rigid structures, compared with a flexible tube, the vibration of the cutter head during operation can be reduced, and the control precision is higher.

Preferably, the first movable connecting mechanism comprises a first limiting groove arranged on the first control tube or the second control tube and a first limiting pin arranged on the second control tube or the first control tube and matched with the first limiting groove, the end part of the first limiting pin is inserted into the first limiting groove, and a gap is reserved between the end surface of the insertion end of the limiting pin and the bottom surface of the limiting groove.

Preferably, a first plug is arranged on the first control tube or the second control tube, the first plug is inserted into the second control tube or the first control tube, the first limit groove is arranged on the first plug, and the first limit pin is arranged on the tube wall of the second control tube or the first control tube.

Preferably, the limiting groove is an annular groove, and the limiting pin is fan-shaped.

Preferably, an avoidance groove is formed in an outer wall surface of the turning of the first control tube and/or an outer wall surface of the turning of the outer cutter tube main body.

Preferably, the direction-changing control lever further comprises a connecting piece arranged at the front end of the first control tube or the second control tube, the front end of the connecting piece is hinged to the rear end of the support sleeve, the rear end of the connecting piece is connected with the front end of the first control tube or the second control tube through a third movable connecting mechanism, and the third movable connecting mechanism enables the connecting piece and the first control tube or the second control tube to rotate relatively.

Preferably, the connecting member includes a tube portion and a strip portion extending forward from a front end of the tube portion in an axial direction, and a front end of the strip portion is hinged to a rear end of the support sleeve.

Preferably, a guide protrusion is arranged on the outer side surface of the strip-shaped portion, a guide groove matched with the guide protrusion is formed in the front end of the outer cutter tube main body, and the guide protrusion is located in the guide groove.

Preferably, the direction-changing driving mechanism comprises a push-pull screw head, a direction-changing adjusting knob and a limiting mechanism, the push-pull screw head is fixed at the rear end of the first control pipe or the second control pipe, the direction-changing adjusting knob is sleeved on the push-pull screw head and is in threaded fit with the push-pull screw head, and the limiting mechanism is used for limiting the push-pull screw head to rotate.

The utility model provides a pair of return bend grinding tool of tool bit angularly adjustable, including interior tool bar subassembly, still include diversion control mechanism.

Drawings

Fig. 1 is a perspective view of a bent pipe grinding tool with an adjustable tool bit angle according to a first embodiment of the present invention;

FIG. 2 is a cross-sectional view of the angle adjustable angle nose grinding tool shown in FIG. 1;

FIGS. 3 and 4 are a front view and an exploded view, respectively, of a rotation adjustment mechanism of the elbow grinding tool with an angularly adjustable tool bit shown in FIG. 1;

FIGS. 5 and 6 are front and exploded views, respectively, of an inner blade assembly of the adjustable-blade angle elbow grinding tool of FIG. 1;

FIGS. 7 and 8 are a front view and an exploded view of a direction change control mechanism of the elbow grinding tool with an angularly adjustable tool bit shown in FIG. 1;

fig. 9, 10 and 11 are enlarged views of a portion M, N, P in fig. 1.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the features in the following embodiments and examples may be combined with each other without conflict.

In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.

As shown in fig. 1 and 2, the elbow grinding tool with an adjustable tool bit angle in the first embodiment of the present invention includes a handle 10, an outer tool bit assembly 20, an inner tool bit assembly 30 and a direction-changing control mechanism 50, the handle 10 includes a fixing sleeve 11, the outer tool bit assembly 20 includes a curved outer tool bit main body 21, a supporting sleeve 24 and a first hinge mechanism disposed between the front end of the outer tool bit main body 21 and the rear end of the supporting sleeve 24, and the first hinge mechanism enables the supporting sleeve 24 and the outer tool bit main body 21 to rotate relatively to each other around a first hinge rotating shaft L1. The inner blade assembly 30 includes a curved inner blade body 31 inserted into the outer blade tube body 21, a blade 37 inserted into the support sleeve 24, and a second hinge mechanism disposed between the front end of the inner blade body 31 and the rear end of the blade 37, wherein the second hinge mechanism enables the blade 37 and the inner blade body 31 to rotate relative to each other about a second hinge axis L2 and transmit torque. The direction-changing control mechanism is used for driving the supporting sleeve 24 to rotate around the first hinge rotating shaft L1 and comprises a direction-changing control rod 50 and a direction-changing driving mechanism, the direction-changing control rod 50 is in a bent shape matched with the outer cutter tube main body 21, the direction-changing control rod 50 penetrates through the outer cutter tube main body 21 and can axially slide relative to the outer cutter tube main body 21, the front end of the direction-changing control rod 50 and the rear end of the supporting sleeve 24 can be pivotally connected around a hinge axis L5, and the direction-changing driving mechanism is used for driving the direction-changing control rod 50 to axially slide back and forth along the outer cutter tube main body.

The utility model discloses a return bend grinding tool of tool bit angularly adjustable because outer sword pipe main part 21 is the bending, can reach the operation position, convenient operation more smoothly when specific operation.

As shown in fig. 1, 3 and 4, the outer cutter tube main body 21 in this embodiment includes an outer cutter tube front section 22 and an outer cutter tube rear section 23 which are sequentially connected from front to rear and form an obtuse angle with each other. For convenience of processing, the outer cutter tube front section 22 is of a split structure and comprises a direction-changing fixing tube 221 and a straight tube 222 which are sequentially connected from front to back, the rear end of the direction-changing fixing tube 221 is inserted into the front end of the straight tube 222 and is fixed by welding, and the front end of the direction-changing fixing tube 221 is connected with the rear end of the support sleeve 24 through a first hinge mechanism.

As shown in fig. 3 and 4, the first hinge mechanism in this embodiment includes a first joint groove 241 provided at the rear end of the support sleeve 24 and a first joint head 221b provided at the front end of the direction-changing fixing tube 221 and engaged with the first joint groove 241, the first joint head 221b is inserted into the first joint groove 241 and rotatably engaged with the first joint groove 241, and the first hinge rotating shaft L1 is a center line of the first joint head 221 b. Thus, when a push-pull force is applied to the rear end of the support sleeve 24, the support sleeve 24 is rotated about the first hinge axis L1. Preferably, the supporting sleeve 24 is provided with two first joint grooves 241 at the rear end thereof, the direction-changing fixing tube 221 is provided with two first joint heads 221b at the front end thereof, and the two first joint heads 221b are respectively inserted into the two first joint grooves 241, so that the supporting sleeve 24 and the outer knife tube main body 21 can rotate more stably. Alternatively, the first hinge mechanism may be another hinge, for example, mounting lugs are respectively disposed on the rear end of the supporting sleeve 24 and the front end of the outer cutter tube main body 21, and the two mounting lugs are connected by a pin.

Preferably, the elbow grinding tool in this embodiment further includes a rotation adjusting mechanism for enabling the tool bit to rotate around the axial direction when the tool bit is in the bending state, the rotation adjusting mechanism includes an outer sleeve 40 and a rotation driving mechanism, a rear end of the outer sleeve 40 is inserted and fixed in the fixing sleeve 11, the outer tool tube main body 21 is inserted into the outer sleeve 40 and can rotate relative to the outer sleeve 40, and the rotation adjusting mechanism is used for driving the outer tool tube main body 21 to rotate relative to the outer sleeve 40. Like this, when supporting cover 24 is in the bending condition (supporting cover 24 rotates certain angle around first articulated pivot L1 promptly), drive outer cutter tube main part 21 through rotary driving mechanism and rotate, rethread first hinge mechanism drives supporting cover 24 and rotates around the axis of outer cutter tube main part 21 to it is rotatory around the axis of outer cutter tube main part 21 to drive tool bit 37, thereby changes the direction of tool bit 37, and the operating range of tool bit 37 is bigger like this, and it is more convenient to operate.

As shown in fig. 3 and 4, preferably, the straight tube 222 and the outer cutter tube rear section 23 in the present embodiment are of a split structure, and a third rotational connection mechanism is provided between the rear end of the straight tube 222 and the front end of the outer cutter tube rear section 23, and is used for transmitting torque. The third rotation connecting mechanism in this embodiment includes a third joint groove 222a provided on the rear end of the straight tube 222 and a third joint head 231 provided on the front end of the outer cutter tube rear section 23 and engaged with the third joint groove 222a, and the third joint head 231 is snapped into the third joint groove 222a and rotationally engaged with the third joint groove 222 a. Preferably, the rear end of the straight tube 222 is oppositely provided with two third joint grooves 222a, the front end of the outer cutter tube rear section 23 is oppositely provided with two third joint heads 231, and the two third joint heads 231 are respectively clamped into the two third joint grooves 222a, so that the rotation between the straight tube 222 and the outer cutter tube rear section 23 is more stable.

Preferably, in order to make the outer cutter tube main body 21 rotate smoothly, a guide structure for guiding the rotation of the outer cutter tube main body 21 is provided between the outer cutter tube main body 21 and the outer sleeve 40. The guide structure in this embodiment includes

guide grooves

222b, 232 provided on the outer peripheral surfaces of the straight tube 222 and the outer cutter tube rear section 23, and

guide pins

41, 42 provided on the outer sleeve 40 to be fitted to the

guide grooves

222b, 232, and the ends of the

guide pins

41, 42 are inserted into the

guide grooves

222b, 232.

As shown in fig. 1-4, the rotary drive mechanism includes a rotary adjustment knob 15 rotatable relative to the fixed hub 11, the rotary adjustment knob 15 being connected to the rear end of the outer cutter tube rear section 23. The outer cutter pipe rear section 23 is driven to rotate by rotating the rotary adjusting knob 15, the straight pipe 222 and the direction-changing fixing pipe 221 are driven to rotate by the third rotating connecting mechanism, and the direction-changing fixing pipe 221 drives the supporting sleeve 24 to rotate by the first hinge mechanism, so that the cutter head 37 is driven to rotate. Preferably, the rear end of the rear section 23 of the outer knife tube is fixed with the transmission sleeve 14, the front end of the rotary adjusting knob 15 is provided with a support lug 152 extending forwards along the axial direction, the front end of the support lug 152 is welded on the transmission sleeve 14, and when the rotary adjusting knob 15 is rotated, the transmission sleeve 14 is driven to rotate, so that the rear section 23 of the outer knife tube is driven to rotate.

As shown in fig. 5 and 6, the inner cutter bar main body 31 in this embodiment includes an inner cutter bar front section 32 and an inner cutter bar rear section 33 sequentially connected from front to back, a rear end of the inner cutter bar front section 32 is connected with a front end of the inner cutter bar rear section 33 through a fourth rotation connection mechanism, and the fourth rotation connection mechanism is used for transmitting torque. In one embodiment, the fourth rotation connection mechanism comprises a fourth joint groove 321 disposed at the rear end of the inner cutter bar front section 32 and a fourth joint head 331 disposed at the front end of the inner cutter bar rear section 33 and matched with the fourth joint groove 321, and the fourth joint head 331 is clamped in the fourth joint groove 321 and is rotatably matched with the fourth joint groove 321.

The second hinge mechanism in this embodiment includes a second joint head 322 disposed at the front end of the front section 32 of the inner cutter bar and a second joint groove 373 disposed at the rear end of the cutter head 37 and engaged with the second joint head 322, and the second joint head 322 is inserted into the second joint groove 373 and rotatably engaged with the second joint groove 373.

For convenience of processing, the inner cutter bar rear section 33 includes an inner cutter bar rear section main body 34, an input rod 35 connected to a rear end of the inner cutter bar rear section main body 34, and an output rod 36 connected to a front end of the inner cutter bar rear section main body 34, wherein an interface for connecting to an output shaft of a driving device (such as a motor) is provided at a rear end of the input rod 35, and a fourth joint 331 is provided at a front end of the output rod 36.

As shown in fig. 5 and 6, the cutting head 37 in this embodiment includes a handle portion 371 penetrating the support sleeve 24 and a grinding portion 372 extending from the front end of the support sleeve 24, and the grinding portion 372 is provided with a cutting edge for cutting human tissue.

During operation, drive arrangement drives input rod 35 and rotates to cutter arbor back end main part 34, output rod 36 rotate in driving, rotate coupling mechanism through the fourth and drive interior cutter arbor anterior segment 32 rotatory, drive tool bit 37 through second hinge mechanism and rotate, cutting edge on the grinding portion 372 when tool bit 37 rotates excises the tissue.

As shown in fig. 7 and 8, the direction-changing control lever 50 in the present embodiment includes a first control tube 51 and a second control tube 52 connected in sequence from front to back, the first control tube 51 is curved to match the outer cutter tube main body 21, the rear end of the first control tube 51 is connected to the front end of the second control tube 52 by a first movable connection mechanism, and the first movable connection mechanism enables the first control tube 51 to move relative to the second control tube 52 in the radial direction of the outer cutter tube assembly 20. Since the first control tube 51 has a bent shape, when the second control tube 52 pushes the first control tube 51 to move forward, the rear end of the first control tube 51 moves upward in fig. 7 with respect to the second control tube 52, and when the second control tube 52 pushes the first control tube 51 to move backward, the rear end of the first control tube 51 moves downward in fig. 7 with respect to the second control tube 52. Alternatively, the positions of the first control tube 51 and the second control tube 52 are reversed, i.e., the first control tube 51 is located on the rear side of the second control tube 52. In this embodiment, the first control tube 51 and the second control tube 52 are rigid, so that the shaking of the cutter head 37 during the operation can be reduced and the control accuracy is higher than that of a flexible tube.

Preferably, as shown in fig. 7, 8 and 9, the first movable connecting mechanism includes a first limiting pin 53 disposed on the first control tube 51 and a first limiting groove 541 disposed on the second control tube 52 and engaged with the first limiting pin 53, an end of the first limiting pin 53 is inserted into the first limiting groove 541, and a gap is left between the end of the first limiting pin 53 and a bottom surface of the first limiting groove 541. Thus, the first control tube 51 and the second control tube 52 are not movable relative to each other in the axial direction of the outer cutter tube assembly 20 but are movable relative to each other in the radial direction of the outer cutter tube assembly 20 by the first stopper pin 53 and the first stopper groove 541. Preferably, the front end of the second control tube 52 is provided with a first plug 54, the first plug 54 is inserted into the rear end of the first control tube 51, the first limiting groove 541 is provided on the first plug 54, and the first limiting pin 53 is provided on the tube wall of the rear end of the first control tube 51. Preferably, the first limiting groove 541 is an annular groove, and the first limiting pin 53 is a fan-shaped groove, so that the contact area is large, and the transmission is more stable. Alternatively, the positions of the first stopper pin 53 and the first stopper groove 541 may be replaced, that is, the first stopper pin 53 is provided on the second control tube 52, and the first stopper groove 541 is provided on the first control tube 51.

In order to prevent interference between the first control tube 51 and the outer cutter tube main body 21 at the corner, an avoiding groove 511 (shown in fig. 7 and 11) is provided at the corner of the first control tube 51 and an avoiding groove 211 (shown in fig. 11) is provided at the corner of the outer cutter tube main body 21.

As shown in fig. 7 and 8, the direction-changing control lever 50 further includes a connecting member 55 provided at a front end of the first control tube 51, and a front end of the connecting member 55 is hinged to a rear end of the support sleeve 24. Preferably, connector 55 includes a tube portion 551 and a strip portion 552 extending axially forward from a front end of tube portion 551. The rear end of the support sleeve 24 is provided with a mounting groove 242 (see fig. 3), the front end of the bar portion 552 is inserted into the mounting groove 242, and a pin shaft (not shown) passes through the groove wall of the mounting groove 242 and the front end of the bar portion 552 to hinge the front end of the bar portion 552 to the rear end of the support sleeve 24.

Preferably, a guide protrusion 553 is provided on an outer side surface of the bar portion 552, a guide groove 221a engaged with the guide protrusion 553 is provided at a front end of the direction-changing fixing pipe 221, the guide protrusion 553 is located in the guide groove 221a, and the forward and backward movement of the connection member 55 is guided by the guide protrusion 553 and the guide groove 221a to be prevented from swinging. Preferably, the connection member 55 is connected to the front end of the first control tube 51 by a second movable connection mechanism, which allows the first control tube 51 and the connection member 55 to rotate relative to each other. Preferably, as shown in fig. 7, 8 and 10, the second movable connecting mechanism includes a second limiting groove 561 disposed on the first control pipe 51 and a second limiting pin 57 disposed on the connecting member 55 and engaged with the second limiting groove 561, and an end of the second limiting pin 57 is inserted into the second limiting groove 561. Preferably, the front end of the first control tube 51 is provided with a second plug 56, the rear end of the second plug 56 is inserted into the front end of the first control tube 51, a second limit groove 561 is provided on the second plug 56, and a second limit pin 57 is provided on the tube wall of the rear end of the connecting member 55. The second limiting groove 561 is an annular groove, and the second limiting pin 57 is fan-shaped.

The turning driving mechanism comprises a push-pull screw head 12, a turning adjusting knob 13 and a limiting mechanism, the push-pull screw head 12 is fixed at the rear end of the second control pipe 52, an external thread is arranged on the push-pull screw head 12, the turning adjusting knob 13 is sleeved on the push-pull screw head 12, an internal thread matched with the external thread is arranged on the turning adjusting knob 13, and the limiting mechanism is used for limiting the push-pull screw head to rotate. In this embodiment, the push-pull screw head 12 is of a flat square structure, the push-pull screw head 12 is located between the two support lugs 152 of the rotation adjusting knob 15, and the rotation of the push-pull screw head 12 is prevented by the two support lugs 152.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.

Claims

1. A turning control mechanism of an elbow grinding tool, the elbow grinding tool comprising:

an outer cutter tube assembly including a curved outer cutter tube main body, a support sleeve, and a first hinge mechanism provided between a front end of the outer cutter tube main body and a rear end of the support sleeve, the first hinge mechanism allowing the support sleeve and the outer cutter tube main body to rotate relative to each other about a first hinge rotation axis;

the cutting tool is characterized in that the turning control mechanism comprises a turning control rod and a turning driving mechanism, the turning control rod is in a bent shape matched with the outer cutter tube main body, and the turning control rod penetrates through the outer cutter tube main body and can move back and forth relative to the outer cutter tube main body in the axial direction; the direction-changing control rod comprises a first curved control tube and a second linear control tube which are sequentially connected from front to back or from back to front, the first control tube is connected with the second control tube through a first movable connection structure, and the first movable connection structure enables the first control tube and the second control tube to move relative to each other along the radial direction of the outer cutter tube main body.

2. The direction-changing control mechanism for the elbow grinding tool according to claim 1, wherein the first movable connection mechanism includes a first limit groove provided on the first control tube or the second control tube, and a first limit pin provided on the second control tube or the first control tube and engaged with the first limit groove, an end of the first limit pin is inserted into the first limit groove, and a gap is left between an end surface of an insertion end of the limit pin and a bottom surface of the limit groove.

3. The direction-changing control mechanism for the elbow grinding tool according to claim 2, wherein a first plug is provided on the first control tube or the second control tube, the first plug is inserted into the second control tube or the first control tube, the first limit groove is provided on the first plug, and the first limit pin is provided on a tube wall of the second control tube or the first control tube.

4. The direction change control mechanism for an elbow grinding tool according to claim 3, wherein the limit groove is an annular groove and the limit pin is fan-shaped.

5. The direction change control mechanism for the elbow grinding tool according to claim 1, wherein an avoidance groove is provided on an outer wall surface of a turn of the first control pipe and/or an outer wall surface of a turn of the outer tool pipe main body.

6. The turning control mechanism of the elbow grinding tool according to claim 1, wherein the turning control lever further comprises a connecting member disposed at a front end of the first control tube or the second control tube, a front end of the connecting member is hinged to a rear end of the support sleeve, a rear end of the connecting member is connected to a front end of the first control tube or the second control tube by a third movable connecting mechanism, and the third movable connecting mechanism enables the connecting member and the first control tube or the second control tube to rotate relatively.

7. The direction change control mechanism for an elbow grinding tool according to claim 6, wherein the connecting member includes a tube portion and a strip portion extending axially forward from a front end of the tube portion, a front end of the strip portion being hinged to a rear end of the support sleeve.

8. The direction-changing control mechanism of the elbow grinding tool according to claim 7, wherein a guide protrusion is provided on an outer side surface of the bar-shaped portion, a guide groove engaged with the guide protrusion is provided at a front end of the outer tool tube main body, and the guide protrusion is located in the guide groove.

9. The turning control mechanism of the elbow grinding tool according to claim 1, wherein the turning drive mechanism comprises a push-pull screw head, a turning adjusting knob and a limiting mechanism, the push-pull screw head is fixed at the rear end of the first control pipe or the second control pipe, the turning adjusting knob is sleeved on the push-pull screw head and is in threaded fit with the push-pull screw head, and the limiting mechanism is used for limiting the push-pull screw head to rotate.

10. An angle-adjustable angle pipe grinding tool comprising an inner cutter bar assembly, characterized by further comprising a direction change control mechanism according to any one of claims 1 to 9.