CN211276662U - Self-tightening drill chuck - Google Patents

Abstract

The utility model discloses a self-clinching drill chuck, including forebody and afterbody, be provided with a plurality of clamping jaw slides in the forebody, be provided with a clamping jaw in each clamping jaw slide, equal threaded connection has a driven gear on each clamping jaw, the one end of afterbody is provided with the driving gear, the driving gear sets up in the forebody and with each driven gear meshing, the modulus of driving gear is 0.2-2, the number of teeth is the multiple of 2 or 3; one end of the rear sleeve, which is far away from the middle sleeve, is provided with a hole for the rear body to penetrate out. The self-tightening drill chuck of the utility model has high reliability, long service life and low production cost.

Description

Self-tightening drill chuck

Technical Field

The utility model relates to the technical field of machining equipment, especially, relate to a self-clinching drill chuck.

Background

The drill chuck is one of the important parts for assisting machine tool machining, called machine tool accessories for short, and at present, three types of drill chucks are mainly available on the market:

(1) tightening the drill chuck by hand: the drill chuck can clamp and loosen the drilling tool by only hands, is named as a hand-tight drill chuck, and has the characteristics of simple operation and low cost, and is the drill chuck with the highest market share. However, the clamping force is limited by the strength of hands, so that the clamping force is only applicable to the industry of electric tools and cannot be applied to the machining industry requiring larger clamping force.

(2) A spanner drill chuck: the special tool can increase the hand clamping force, so that the requirement of most machining equipment on the clamping force can be met, and the requirement of all electric tools can be met, so that the special tool is popular. But the special wrench tool is easy to lose due to inconvenient operation, so that the market share is lower than that of a hand-tightened drill chuck.

(3) A self-tightening drill chuck: the automatic clamping device has the advantages that the clamping force is overlarge, the requirements of any processing equipment and electric tools can be met, when a drilling tool needs to be loosened, the drilling tool can be loosened only by means of a special tool, and the operation is inconvenient. And because the structure is complex, the cost is high, and the weight is overweight, only a small part of the steel is adopted by machining equipment, and the market share is low all the time.

The driving gear of the existing gear self-tightening drill chuck is improperly designed and assembled in module, which can cause the occurrence of tooth breakage; improper tooth number can cause the problem that the amplification factor of the clamping force is too large or too small, and the too large clamping force can cause the drill chuck to be loosened by hand; too small a bit may result in the drill chuck not gripping the drill and not working.

The existing drill chucks with taper holes, which are connected with external equipment, adopt a striking method during replacement and disassembly, which not only harms the precision of processing equipment and the drill chuck, but also shortens the service life of the processing equipment and the drill chuck, and can seriously and directly cause the damage and the scrapping of the processing equipment and the drill chuck.

The existing gear drill chuck can increase the occurrence rate of faults due to improper selection of the positioning pin, reduce the service life of the self-tightening drill chuck, influence the precision of the drill chuck and cause that the market sales can not be improved after a delay.

Several locating pins in the existing drill chuck have respective defects, and the locating pins have square, round (steel balls or cylindrical) and flat shapes. The side length of the square positioning pin is the same as the width of the clamping jaw positioning groove, but the positioning hole on the front body needs to be processed into a square shape, so that the difficulty and the cost are increased; the processing cost of the cylindrical positioning pin and the positioning hole on the front body is the lowest, but the cylindrical positioning pin is only in line contact with the clamping jaw in the positioning groove, and because an assembly gap exists between the positioning pin and the positioning groove, the positioning pin and the positioning groove are in point contact when the drill chuck works, so that the threads at the top of the clamping jaw on one side of the clamping jaw subjected to the resistance of the positioning pin can be easily broken, and scraps can be scattered between the threads to block the rotation of the gear and the clamping jaw, so that the drill chuck loses the working capacity; the flat positioning pin has a good positioning effect, but the positioning hole on the front body needs to be processed into a flat shape, so that the cost is higher, and if the positioning hole of the front body is also circular, the flat pin has a swinging space in the circular positioning hole, so that the clamping jaw can swing, and the clamping precision of the drill chuck is influenced.

When the existing gear self-tightening drill chuck works, the reverse acting force generated by the clamping jaw born by the driven gear is very large, so that the contact part of the driven gear and the gear containing hole of the forebody generates very large extrusion force and friction force, the due clamping force of the drill chuck is reduced, and the torque for loosening the drill chuck is increased. The drill chuck must be loosened by means of a special tool. The working efficiency is reduced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a self-clinching drill chuck to solve the problem that above-mentioned prior art exists, improve self-clinching drill chuck's reliability and life and the precision of processing, reduction in production cost simultaneously.

In order to achieve the above object, the utility model provides a following scheme:

the utility model provides a self-clinching drill chuck, including forebody and afterbody, the forebody front portion is provided with the drilling tool accommodation hole, and the afterbody corresponds the afterbody is provided with afterbody holding hole, the forebody still is provided with a plurality of clamping jaw slides and a plurality of gear holding hole, gear holding hole with clamping jaw slide one-to-one, every be provided with a clamping jaw in the clamping jaw slide, every equal threaded connection has a driven gear on the clamping jaw, driven gear is located in the gear holding hole, the afterbody sets up in the afterbody holding hole, and the afterbody with the forebody rotate to be connected, can not axial displacement, the one end of afterbody is equipped with the back hole or the connecting rod with external device fixed connection, the back hole is screw hole or taper hole, the connecting rod is the taper shank connecting rod; the other end of the rear body is provided with a driving gear, the driving gear is arranged in the accommodating hole of the front body and meshed with each driven gear, the modulus of the driving gear is 0.2-2, and the number of teeth is a multiple of 2 or 3.

Preferably, the plurality of driven gears are uniformly arranged with the axis of the driving gear as a center line.

Preferably, the number of teeth of the driving gear is 6, 8, 9, 10, 12, 14, 15, 16 or 18, and the number of teeth of the driving gear is preferably 9, 12, 15 or 18.

Preferably, the front body corresponds each clamping jaw slide and has set firmly the locating pin hole, be provided with the locating pin on the locating pin hole, the clamping jaw corresponds the locating pin is provided with the constant head tank, the length direction of constant head tank with the length direction of clamping jaw is parallel, the locating pin with correspond constant head tank sliding fit.

Preferably, the locating pin is single shape or combined shape, single shape is square, circular, cylindrical or flat, when the locating pin is combined shape the locating pin is circle-square combination locating pin, circle-flat combination locating pin, square circle square locating pin, oblate flat locating pin or square circle flat locating pin, circle square combination locating pin one end is circular, the other end is square, circle flat combination locating pin one end is circular, the other end is flat, square circle square locating pin one end is square, the centre is circular, the other end is square, oblate flat locating pin be that one end is flat, the centre is circular, the other end is flat, the one end of square circle flat locating pin is square, the centre is circular, the other end is flat.

Preferably, the outer wall of the clamping jaw is provided with a clamping jaw external thread, and the driven gear is provided with a driven gear internal thread corresponding to the clamping jaw external thread.

Preferably, the front end of the clamping jaw is provided with 1-3 clamping margins, the number of the clamping margins is preferably 2, and the clamping margins enable the clamping jaw to clamp the drilling tool more stably and keep the precision of a processed product of the drill chuck.

Preferably, the front body is provided with an emergency hole.

Preferably, the self-clinching drill chuck is provided with an outer sleeve, and the outer sleeve comprises a front sleeve, a middle sleeve and a rear sleeve; the front sleeve and the front body are of an integral structure, or the front sleeve and the middle sleeve are of an integral structure, or the middle sleeve and the rear sleeve are of an integral structure.

Preferably, the driven gear is provided with a bearing at one side of the gear accommodating hole far away from the drilling tool accommodating hole; the back body is worn out one end of the back sleeve is provided with an external thread, and a detachable nut with an internal thread is connected through the thread.

Preferably, dismantle the nut including preceding dismantlement nut and back dismantlement nut, the inner wall of preceding dismantlement nut is equipped with the internal thread, the outer wall is equipped with partial external screw thread, the inner wall of back dismantlement nut is equipped with the internal thread, the internal thread of back dismantlement nut with the external screw thread connection of preceding dismantlement nut.

Preferably, the end of the dismounting nut away from the front body is provided with a dismounting bearing.

Preferably, the dismounting nut is radially provided with a plurality of dismounting holes.

The utility model discloses keyless drill chuck has obtained following technological effect for prior art:

the self-tightening drill chuck of the utility model has high reliability, long service life and low production cost. The self-tightening drill chuck of the utility model not only ensures the positioning effect, but also reduces the production cost by arranging the combined positioning pin; by designing a proper gear module and tooth number, the reliability of the self-clinching drill chuck is improved, and the service life is prolonged; through setting up dismounting device, can realize the safe and quick dismantlement of drill chuck.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural view of a self-clinching drill chuck of the present invention;

FIG. 2 is a schematic view of a part of the structure of the self-clinching drill chuck of the present invention;

FIG. 3 is a schematic view of a second partial structure of the self-clinching drill chuck of the present invention;

FIG. 4 is a schematic structural view of a 120-degree clamping jaw in the self-clinching drill chuck of the present invention;

FIG. 5 is a schematic view of a W1 type clamping jaw in the self-clinching drill chuck of the present invention;

FIG. 6 is a schematic view of a V-shaped clamping jaw of the self-clinching drill chuck of the present invention;

FIG. 7 is a schematic view of a W2 type clamping jaw in the self-clinching drill chuck of the present invention;

FIG. 8 is a schematic structural view of a round and square combined positioning pin in the self-clinching drill chuck of the present invention;

FIG. 9 is a schematic structural view of a round and flat combined positioning pin in the self-clinching drill chuck of the present invention;

FIG. 10 is a schematic structural view of an oblate and oblate locating pin in the self-clinching drill chuck of the present invention;

FIG. 11 is a schematic structural view of a vertical flat positioning pin in the self-clinching drill chuck of the present invention;

FIG. 12 is a schematic view of the structure of the self-clinching drill chuck of the present invention with a taper shank connecting rod;

wherein: 100-rear body, 101-front body, 102-clamping jaw, 1021-clamping blade band, 103-clamping jaw slide, 104-combination positioning pin, 105-driven gear, 106-gear accommodating hole, 107-rear body accommodating hole, 108-driving gear, 109-clamping jaw external thread, 111-screw, 112-axial limiting part, 113-first hole, 114-second hole, 119-front sleeve, 121-rear sleeve, 126-end cap, 127-drilling tool accommodating hole, 132-bearing, 222-middle sleeve, 223-positioning groove, 224-front disassembly nut, 225-taper hole, 228-rear disassembly nut, 229-disassembly bearing, 230-rear body disassembly external thread, 231-positioning hole, 232-driven gear internal thread, 234-emergency hole, 236-taper shank connecting rod, 238-front disassembly nut internal thread, 239-front disassembly nut external thread, 248-disassembly hole, and 252-rear hole.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The utility model aims at providing a self-clinching drill chuck to solve the problem that above-mentioned prior art exists, improve self-clinching drill chuck's reliability and life, reduction in production cost simultaneously.

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.

As shown in fig. 1-12: the self-clinching drill chuck of the embodiment comprises a front body 101 and a rear body 100, wherein three clamping jaw slideways 103 are arranged in the front body 101, a clamping jaw 102 is arranged in each clamping jaw slideway 103, a driven gear 105 is in threaded connection with each clamping jaw 102, 1-3 clamping blade bands 1201 are arranged at the front ends of the clamping jaws 102, and the clamping jaws 102 can be 120 degrees, W1, V or W2 (refer to figures 4-7). The outer wall of the clamping jaw 102 is provided with a clamping jaw external thread 109, and the clamping jaw external thread 109 can adopt a single-head thread or a multi-head thread, but preferably adopts a multi-head thread with a large lead; driven gear 105 is provided with driven gear internal thread 232 corresponding to jaw external thread 109, the one end of afterbody 100 is provided with driving gear 108, driving gear 108 sets up in front body 101, the front end and the front body 101 normal running fit of afterbody 100, still be provided with afterbody holding hole 107 in the front body 101, afterbody 100 part is located afterbody holding hole 107, afterbody holding hole 107 includes taper hole 225, first hole 113 and second hole 114, the aperture of first hole 113 is greater than the aperture of second hole 114, driving gear 108 is located second hole 114, and every driven gear 105 all meshes with driving gear 108, and a plurality of driven gear 105 uses the axis of driving gear 108 to evenly set up as the central line.

The middle part of the rear body 100 is provided with an axial limiting part 112, the front body 101 is provided with a gear accommodating hole 106 corresponding to the driven gear 105, the driven gear 105 is placed in the corresponding gear accommodating hole 106, a bearing 132 is arranged on one side, away from the drill accommodating hole 127, of the gear accommodating hole 106 where the driven gear 105 is located, the front end cover of the front body 101 is provided with a front sleeve 119 (or the front body 101 and the front sleeve 119 are integrated), the rear body 100 is further sleeved with an end cover 126, the end cover 126 is fixedly connected with the drill chuck front body 101 through a screw 111, and the end cover 126 is in close contact with the axial limiting part 112, so that the rear body 100 can only radially rotate in the rear body accommodating hole 107 of the front body 101 and cannot move back and forth; the front end of the front body 101 is also provided with a drill receiving hole 127.

The working principle of the self-clinching drill chuck of the embodiment is as follows:

when a power shaft of the external equipment rotates, the power transmission part fixedly connected with the drill chuck rear body 100 through the rear connecting hole 252 or the taper shank connecting rod 236 drives the drill chuck rear body 100 to synchronously rotate, the driving gear 108 of the rear body 100 synchronously drives the driven gear 105 to rotate, the driven gear 105 synchronously drives the clamping jaw 102 provided with the external thread to move forwards in the clamping jaw slideway 103 through the internal thread, the clamping jaw 102 clamps a drilling tool in the drilling tool accommodating hole 127, and the work of the drill chuck is started;

when the drill chuck stops working and the drilling tool needs to be replaced, the back sleeve 121 fixedly connected with the back body 100 is fixed by one hand, the middle sleeve 222 fixedly connected with the front body 101 is held and rotated by the other hand, the clamping jaws 102 can move reversely, the original drilling tool is loosened, and the new drilling tool is replaced. Similarly, the action of the clamping jaws to release the drilling tool can be realized by holding the middle sleeve 222 with one hand and holding and rotating the rear sleeve 121 with the other hand.

When the external equipment is provided with a shaft lock, namely when the equipment stops rotating, the power shaft is locked by the equipment and cannot rotate, and the rear body fixedly connected with the power shaft is also locked and cannot rotate, at this time, the action of loosening the drilling tool by the drill chuck can be realized only by rotating the middle sleeve 222 of the drill chuck or the outer sleeve which integrates the middle sleeve 222 with the rear sleeve 121.

The existing processing equipment, particularly an electric tool, has higher and higher requirements on the overall dimension of a drill chuck, namely the smaller the volume is, the better the volume is, the smaller the module of a gear of the self-tightening drill chuck is, the better the module is, and under the same overall dimension, the smaller the module of the gear is, the thinner the rack is, the smaller the bearing force is, and teeth are easy to break during the operation of the drill chuck, so that the drill chuck is scrapped. The larger the modulus of the gear is, the thicker the rack is, the larger the overall dimension of the drill chuck is, and even the requirement of the electric tool cannot be met.

In the present embodiment, the module of the driving gear 108 is 0.2-2, and the number of teeth is a multiple of 2 or 3; the number of teeth of the driving gear 108 is 6, 8, 9, 10, 12, 14, 15, 16 or 18, and the number of teeth of the driving gear 108 is preferably 9, 12, 15 or 18; according to the requirements of different devices, the design of proper modulus and tooth number matching is adopted, the requirements of the devices on the clamping force and the overall dimension of the drill chuck can be met, the situation that the self-tightening drill chuck is scrapped and does not meet the dimensional requirement due to broken teeth caused by improper modulus and tooth number matching of the gear can be avoided, the service life of the drill chuck is prolonged, and the use cost of a customer is reduced.

The front body 101 is sleeved with the middle sleeve 222, the side walls of the front body 101 and the middle sleeve 222 are provided with emergency holes 234, and under the condition that the drill chuck is not clamped or loosened accidentally, an operator can conveniently clamp or loosen the drill chuck by adopting general tools (a round bar screwdriver, a prismatic spanner and the like) which are necessary for each factory.

The rear body 100 is sleeved with a rear sleeve 121, the rear sleeve 121 and the middle sleeve 222 can be detachably connected or can be integrated into a structure, one end of the rear sleeve 121 far away from the middle sleeve 222 is provided with a hole for the rear body 100 to penetrate out, one end of the rear body 100 penetrating out of the rear sleeve 121 is connected with a front disassembly nut 224 in a threaded manner, one end of the rear body 100 penetrating out of the rear sleeve 121 is provided with a rear body disassembly external thread 230, the front disassembly nut 224 is provided with a front disassembly nut internal thread 238 and a front disassembly nut external thread 239, the front disassembly nut 224 compresses the end face of one end of the rear sleeve 121 far away from the middle sleeve 222, the front disassembly nut 224 is connected with a rear disassembly nut 228 in a threaded manner, one end of the rear body 100 far away from the front body 101 is connected with a connecting shaft of a driving device through a disassembly bearing 229, the connecting shaft of the driving device is fixedly connected with the rear body 100, the rear disassembly nut 228 can be conveniently and easily separated from the connecting shaft of the driving device when the drill chuck is disassembled, and the situation that disassembly cannot be completed due to friction locking or overlarge extrusion force between the rear disassembly nut 228 and the connecting shaft of the driving device is avoided; the disassembly nut can be designed into one, and can also be designed into a front disassembly nut and a rear disassembly nut with larger disassembly range so as to meet the disassembly requirements of various drill chucks. The front disassembly nut 224 and the rear disassembly nut 228 form a disassembly device, and drill chucks of various specifications can be safely, harmlessly and quickly disassembled; the disassembly nut is provided with a plurality of disassembly holes 248 in the radial direction, in this embodiment, the disassembly holes 248 may be provided on the front disassembly nut 224 or the rear disassembly nut 228, and the operator may use a general-purpose tool (a round bar screwdriver or a prismatic wrench, etc.) necessary for each processing unit to complete the work of disassembling the drill chuck through the disassembly holes 248.

The front body 101 is fixedly provided with a positioning pin hole corresponding to each clamping jaw slide way 103, a positioning pin 104 is arranged on the positioning pin hole, a positioning groove 223 is arranged on the clamping jaw 102 corresponding to the positioning pin 104, the length direction of the positioning groove 223 is parallel to the axial direction of the clamping jaw 102, the positioning pin 104 is in sliding fit with the corresponding positioning groove 223, and the clamping jaw 102 can only move axially back and forth in the clamping jaw slide way 103.

The positioning pin 104 is in a single shape or a combined shape, the single shape is square, round, cylindrical or flat, when the positioning pin 104 is in the combined shape, the positioning pin 104 is a round-square combined positioning pin, a round-flat combined positioning pin, a vertical flat positioning pin, a square round square positioning pin, a square round flat positioning pin or a flat round flat positioning pin, one end of the round-square combined positioning pin is round, the other end of the round-square combined positioning pin is square, one end of the round flat combined positioning pin is round, the other end of the round flat combined positioning pin is flat, the positioning effect of the round-square combined positioning pin and the positioning effect of the round flat combined positioning pin are the same, but the production cost.

The square positioning pin of the square shape has the advantages that one end of the square positioning pin of the square shape is square, the middle of the square positioning pin of the square shape is circular, the other end of the square positioning pin of the flat shape of the square shape is flat, one end of the flat positioning pin of the flat shape of.

The positioning pin hole on the front body 101 is preferably round or flat, and the positioning pin is more convenient to install due to the fact that the positioning pin hole is simple to machine and accurate in positioning; the contact portion of the positioning pin 104 with the jaw slide 103 is preferably square or flat.

The locating pins 104 are preferably flat and combination locating pins. One end of the square or flat positioning pin is matched with the clamping jaw positioning groove, so that the positioning effect is good, the clamping jaw threads cannot be damaged, and the service life of the drill chuck can be well ensured; the middle circle can be well matched with a circular positioning hole on the front body, so that the positioning pin 104 is ensured not to swing in the positioning hole, the clamping jaw 102 is ensured not to swing left and right, and the precision of the drill chuck can be ensured; the square or flat shape at the other end can provide a good identification shape for an installed robot or an assembling person, so that the robot or the assembling person can quickly and accurately insert the square or flat end of the positioning pin into the clamping jaw positioning groove; the production efficiency is improved.

The bearing 132 is arranged on one side, away from the drilling tool accommodating hole, of the gear accommodating hole 106 where the driven gear 105 is located, and when the drill chuck works, the side, away from the drilling tool accommodating hole 127, of the driven gear 105 is in surface-to-surface contact with the upper side of the gear accommodating hole 106 of the precursor, so that great friction force and extrusion force can be borne, the due clamping force of the drill chuck is reduced, the torque for loosening the drill chuck is increased, and an operator cannot loosen the self-tightening drill chuck by hand. After the bearing 132 is arranged, the large friction force and the extrusion force formed by the contact part of the driven gear 105 and the gear containing hole 106 are changed into small rolling or sliding friction force, which is beneficial to the transmission of the clamping force of the drill chuck and the loosening of the drill chuck by hands of an operator, the operation is simple, and the working efficiency is improved.

In the description of the present invention, it should be noted that the terms "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present specification should not be construed as a limitation of the present invention.

Claims (10)

1. A self-clinching drill chuck comprises a front body, a clamping jaw and a rear body, wherein a drilling tool accommodating hole is formed in the front part of the front body, a rear body accommodating hole is formed in the rear part of the front body corresponding to the rear body, a plurality of clamping jaw slideways and a plurality of gear accommodating holes are further formed in the front body, the gear accommodating holes correspond to the clamping jaw slideways one by one, a clamping jaw is arranged in each clamping jaw slideway, a driven gear is connected to each clamping jaw in a threaded mode and is located in the gear accommodating hole, the rear body is arranged in the rear body accommodating hole, the rear body is rotatably connected with the front body and cannot move axially, a rear hole or a connecting rod fixedly connected with external equipment is formed in one end of the rear body, the rear hole is a threaded hole or a taper hole, and the connecting rod is a taper shank connecting rod; the other end of afterbody is provided with the driving gear, the driving gear setting is in the accommodation hole of precursor and with every driven gear meshing, its characterized in that: the module of the driving gear is 0.2-2, and the number of teeth is a multiple of 2 or 3.

2. The keyless drill chuck according to claim 1, wherein: the driven gears are uniformly arranged by taking the axis of the driving gear as a central line.

3. The keyless drill chuck according to claim 1, wherein: the number of teeth on the driving gear is 6, 8, 9, 10, 12, 14, 15, 16 or 18.

4. The keyless drill chuck according to claim 1, wherein: the front body corresponds every clamping jaw slide and has set firmly the locating pin hole, be provided with the locating pin on the locating pin hole, the clamping jaw corresponds the locating pin is provided with the constant head tank, the length direction of constant head tank with the length direction of clamping jaw is parallel, the locating pin with correspond constant head tank sliding fit.

5. The keyless drill chuck according to claim 4, wherein: the locating pin is single shape or combination shape, single shape is square, circular, cylindrical or flat, when the locating pin is combination shape, the locating pin is circle-square combination locating pin, circle-flat combination locating pin, square locating pin, oblate flat locating pin or flat locating pin of square, circle-square combination locating pin one end is circular, the other end is square, circle-flat combination locating pin one end is circular, the other end is flat, square locating pin one end is square, the centre is circular, the other end is square, oblate flat locating pin be that one end is flat, the centre is circular, the other end is flat, square flat locating pin one end is square, the centre is circular, the other end is flat, the square flat locating pin one end is square, the centre is circular, the other end is flat.

6. The keyless drill chuck according to claim 1, wherein: the outer wall of the clamping jaw is provided with a clamping jaw external thread, and the driven gear is provided with a driven gear internal thread corresponding to the clamping jaw external thread.

7. The keyless drill chuck according to claim 1, wherein: the front end of the clamping jaw is provided with 1-3 clamping knife edges.

8. The keyless drill chuck according to claim 1, wherein: the front body is provided with an emergency hole.

9. The keyless drill chuck according to claim 1, wherein: the self-clinching drill chuck is provided with an outer sleeve, and the outer sleeve comprises a front sleeve, a middle sleeve and a rear sleeve; the front sleeve and the front body are of an integral structure, or the front sleeve and the middle sleeve are of an integral structure, or the middle sleeve and the rear sleeve are of an integral structure.

10. A keyless drill chuck according to claim 9, wherein: and a bearing is arranged on one side of the driven gear, which is far away from the drilling tool accommodating hole, in the gear accommodating hole.

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