Drill chuck

Abstract

The utility model provides a drill chuck, and belongs to the technical field of drill chucks. The drill chuck solves the problem that an existing drill chuck is short in service life. The drill chuck comprises a drill body and three clamping jaws arranged in the drill body in a penetrating mode, the drill body is sleeved with a hand tightening sleeve, hand tightening nuts in threaded connection with the clamping jaws are arranged in the hand tightening sleeve, the upper end of the drill body is further sleeved with a mounting cap, an annular clamping groove is formed in the outer side wall of the upper end of the drill body, and a clamping ring for pressing the mounting cap to the upper end of the hand tightening sleeve is clamped in the clamping groove. A phosphating protection layer is arranged on the outer surface of the drill body, an electrophoresis layer is arranged on the outer surface of the installation cap, and an oxidation layer is arranged on the outer surface of the clamping jaw. When the drill chuck is used, the installation cap can be stably connected with the drill body and does not generate friction with the drill body, friction between the drill body and the hand tightening sleeve is avoided, and the service life of the drill chuck is further prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of drill chucks and relates to a drill chuck. Background Art

[0002] When an existing manual electric drill or drilling machine is used for processing, due to the different products being processed, a drill chuck is required to be installed with a corresponding drill bit to process the product. As the application scope of power tools expands, the requirements for the clamping force and impact resistance of the drill chuck are getting higher and higher. When the drill chuck is used for a long time, the drill body is partially exposed, and the jaws will rotate and extend out of the outer shell when positioning different drill bits. Most of these parts are made of metal materials, which will cause oxidation corrosion and the like during long-term use, affecting the service life of the parts.

[0003] In response to the above-mentioned problems, people have developed a drill chuck, such as the Chinese patent application [Authorization Announcement No.: CN214349834U], which discloses a drill chuck, including a chuck body and a sleeve sleeved on the outer periphery of the chuck body, the chuck body extends along both sides of the radial direction to form two bosses, the two bosses are recessed inward to form a slot that matches the sleeve insert, the head of the chuck body is provided with a plurality of guide platforms distributed along the circumferential direction, and the hole wall of the claw hole of the chuck body is coated with a low-temperature thin film coating.

[0004] Although the above-mentioned method realizes the rapid installation of the chuck body by providing a plurality of guide platforms and improves the wear resistance and reduces the friction coefficient by coating the walls of the claw holes of the chuck body with a low-temperature thin film coating, the end of the chuck body is exposed to the outside and is easily oxidized during long-term use, resulting in a short service life of the chuck body. Utility Model Content

[0005] The utility model aims at the above problems existing in the prior art and proposes a drill chuck. The technical problem to be solved by the utility model is: how to solve the problem of short service life of the prior drill chuck.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] A drill chuck comprises a drill body and three clamping jaws inserted into the drill body, wherein a hand-tightening sleeve is provided on the outer surface of the drill body, and a hand-tightening nut threadedly connected to the clamping jaws is provided in the hand-tightening sleeve. The drill chuck is characterized in that a mounting cap is also provided on the upper end of the drill body, an annular groove is provided on the outer side wall of the upper end of the drill body, a clamping ring for pressing the mounting cap onto the upper end of the hand-tightening sleeve is clamped in the groove, the outer surface of the drill body has a phosphating protective layer, the outer surface of the mounting cap has an electrophoretic layer, and the outer surface of the clamping jaw has an oxide layer.

[0008] Working principle: During installation, insert the clamping jaws into the corresponding inclined grooves of the drill body, thread the hand-tightening nut with the clamping jaws and sleeve them on the middle part of the drill body, sleeve the hand-tightening sleeve outside the drill body, and the upper end of the drill body is sleeved with a mounting cap, and the lower end of the mounting cap is pressed against the upper end of the hand-tightening sleeve by a retaining ring. By dividing the entire outer shell into the hand-tightening sleeve and the mounting cap, on the one hand, it is convenient to install the drill chuck, and on the other hand, since only the upper end of the drill body connected to the mounting cap is exposed, the wear resistance and corrosion resistance of the drill body can be achieved by forming a phosphating protective layer on the outer surface, thereby extending the service life of the drill body. Both the mounting cap and the clamping jaws need to be mostly exposed to the air in the working state, and the electrophoretic layer of the mounting cap and the oxide layer of the clamping jaws can play a good anti-oxidation effect, so that different components are protected by having different protective layers, thereby extending the service life of the components, and adopting a split connection, so that when in use, the mounting cap can stably connect with the drill body without friction with the drill body, thereby avoiding friction between the drill body and the hand-tightening sleeve, thereby further extending its service life.

[0009] In the above-mentioned drill chuck, the mounting cap has a mounting step, and the mounting step has a horizontally arranged limiting wall, and the limiting wall is located below the retaining ring and abuts against the retaining ring.

[0010] The setting of the limiting wall makes the part of the drill body located above the limiting wall exposed to the air, and the other part is located below the limiting wall. Therefore, the drill body only needs to ensure that it has good wear resistance, and it is also convenient for the retaining ring to limit, making the installation of the drill chuck more stable.

[0011] In the above-mentioned drill chuck, the hand-tightening sleeve is provided with an inner sleeve, and the inner sleeve is located between the hand-tightening sleeve and the hand-tightening nut. The upper end of the hand-tightening sleeve is bent to form a limiting ring, and the inner sleeve has a limiting step. The limiting ring is pressed on the limiting step through the lower end of the mounting cap, and the outer surface of the hand-tightening sleeve has an electrophoretic layer.

[0012] The setting of the inner sleeve presses the limit ring onto the limit step through the mounting cap, thereby improving the stability of the connection of the hand-tightening sleeve, making the connection between the hand-tightening sleeve and the mounting cap stable, and the outer surface of the hand-tightening sleeve also has an electrophoretic layer, which makes the hand-tightening sleeve also have a good anti-oxidation effect, thereby improving the overall service life of the drill chuck.

[0013] In the above-mentioned drill chuck, the upper end of the inner sleeve passes through the hand-tightening sleeve, and there is a clearance gap between the upper end of the inner sleeve and the limiting wall.

[0014] When installing, the upper and lower ends of the mounting cap are limited by other components respectively. Therefore, in order not to affect the installation of the mounting cap, a clearance is provided, which makes the installation of the mounting cap more convenient, reduces the processing accuracy of the mounting cap, and saves the production cost of the mounting cap.

[0015] In the above-mentioned drill chuck, the lower end of the hand-tightening sleeve is tightly connected with a tail cover, the lower end of the drill body has a columnar limiting portion, the inner side protrusion of the tail cover is formed to be sleeved on the limiting column, the outer surface of the tail cover has an oxide layer, and the phosphating protective layer of the drill body is also coated with an oxide layer.

[0016] The setting of the tail cover ensures that all exposed parts of the entire drill chuck have an oxide layer, further improving the anti-oxidation effect of the entire drill chuck during use, thereby increasing its service life.

[0017] In the above-mentioned drill chuck, a corner of the limiting portion is provided with an inwardly recessed clearance ring groove, and a distance is provided between the outer side wall of the limiting column and the clearance ring groove.

[0018] The setting of the spacing makes the installation of the limiter more convenient and improves the convenience of installation.

[0019] Compared with the prior art, the utility model has the following advantages: by dividing the entire housing into a hand-tight sleeve and a mounting cap, on the one hand, it is convenient to install the drill chuck; on the other hand, since only the upper end of the drill body connected to the mounting cap is exposed, the wear resistance and corrosion resistance of the drill body can be achieved by forming a phosphating protective layer on the outer surface, thereby extending the service life of the drill body. The mounting cap and the clamping jaws need to be mostly exposed to the air in the working state, and the electrophoretic layer of the mounting cap and the oxide layer of the clamping jaws can play a good anti-oxidation effect, so that different components can be provided with different protective layers to protect the components and extend the service life of the components. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a half-section view of the utility model.

[0021] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle.

[0022] Figure 3 yes Figure 1 A partial enlarged view of point B in the middle.

[0023] In the figure, 1, drill body; 11, slot; 12, limit part; 12a, limit ring groove; 2, clamping claw; 3, hand-tightening sleeve; 31, limit ring; 4, hand-tightening nut; 5, mounting cap; 51, mounting step; 51a, limit wall; 6, retaining ring; 7, inner sleeve; 71, limit step; 8, clearance; 9, tail cover; 91, limit column; 10, spacing. DETAILED DESCRIPTION

[0024] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0025] like Figure 1 As shown, the drill chuck comprises a drill body 1 and three clamping jaws 2 inserted into the drill body 1 . A hand-tightening sleeve 3 is disposed outside the drill body 1 . A hand-tightening nut 4 threadedly connected to the clamping jaws 2 is disposed inside the hand-tightening sleeve 3 .

[0026] Specifically, Figure 1-3 As shown, a mounting cap 5 is also sleeved on the upper end of the drill body 1, and an annular clamping groove 11 is opened on the outer side wall of the upper end of the drill body 1, and a clamping ring 6 for pressing the mounting cap 5 onto the upper end of the hand-tightening sleeve 3 is clamped in the clamping groove 11, and the mounting cap 5 has a mounting step 51, and the mounting step 51 has a horizontally arranged limiting wall 51a, and the limiting wall 51a is located below the clamping ring 6 and abuts against the clamping ring 6. The outer surface of the drill body 1 has a phosphating protective layer, and the phosphating protective layer of the drill body 1 is also coated with an oxide layer, the outer surface of the mounting cap 5 has an electrophoretic layer, and the outer surface of the clamping jaw 2 has an oxide layer.

[0027] Working principle: During installation, insert the clamping jaw 2 into the corresponding inclined groove of the drill body 1, thread the hand-tightening nut 4 with the clamping jaw 2 and sleeve it on the middle part of the drill body 1, sleeve the hand-tightening sleeve 3 on the outside of the drill body 1, and sleeve the upper end of the drill body 1 with a mounting cap 5. The lower end of the mounting cap 5 is pressed against the upper end of the hand-tightening sleeve 3 by a clamping ring 6. By dividing the entire housing into the hand-tightening sleeve 3 and the mounting cap 5, on the one hand, it is convenient to install the drill chuck. On the other hand, since only the upper end of the drill body 1 connected to the mounting cap 5 is exposed, the wear resistance and It is corrosion-resistant and prolongs the service life of the drill body 1. The mounting cap 5 and the clamping jaw 2 need to be mostly exposed to the air in the working state. The electrophoretic layer of the mounting cap 5 and the oxide layer of the clamping jaw 2 can play a good anti-oxidation effect, so that different components are provided with different protective layers to protect the components and prolong the service life of the components. In addition, a split connection is adopted, so that when in use, the mounting cap 5 can stably achieve connection with the drill body 1 without friction with the drill body 1, avoiding friction between the drill body 1 and the hand-tightening sleeve 3, and further prolonging its service life.

[0028] like Figure 1 and Figure 2 As shown, the hand-tightening sleeve 3 is provided with an inner sleeve 7, and the inner sleeve 7 is located between the hand-tightening sleeve 3 and the hand-tightening nut 4. The upper end of the hand-tightening sleeve 3 is bent to form a limiting ring 31, and the inner sleeve 7 has a limiting step 71. The limiting ring 31 is pressed on the limiting step 71 through the lower end of the mounting cap 5. The outer surface of the hand-tightening sleeve 3 has an electrophoretic layer, the upper end of the inner sleeve 7 passes through the hand-tightening sleeve 3, and a clearance gap 8 is provided between the upper end of the inner sleeve 7 and the limiting wall 51a.

[0029] like Figure 1 and Figure 3As shown, the lower end of the hand-tightening sleeve 3 is tightly connected with the tail cover 9, the lower end of the drill body 1 has a columnar limiting portion 12, the inner side protrusion of the tail cover 9 is formed to be sleeved on the limiting column 91, the outer surface of the tail cover 9 has an oxide layer, and the phosphating protective layer of the drill body 1 is also coated with an oxide layer. The corner of the limiting portion 12 has an inwardly concave yielding ring groove, and there is a spacing 10 between the outer side wall of the limiting column 91 and the yielding ring groove.

[0030] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A drill chuck, comprising a drill body (1) and three clamping jaws (2) inserted into the drill body (1), wherein the drill body (1) is provided with a hand-tightening sleeve (3) on its outer surface, and a hand-tightening nut (4) threadedly connected to the clamping jaws (2) is provided in the hand-tightening sleeve (3), characterized in that: The upper end of the drill body (1) is also sleeved with a mounting cap (5), and the outer side wall of the upper end of the drill body (1) is provided with an annular clamping groove (11), and a clamping ring (6) is clamped in the clamping groove (11) to press the mounting cap (5) onto the upper end of the hand-tightening sleeve (3). The outer surface of the drill body (1) has a phosphating protective layer, the outer surface of the mounting cap (5) has an electrophoretic layer, and the outer surface of the clamping jaw (2) has an oxide layer.

2. The drill chuck according to claim 1, characterized in that: The mounting cap (5) has a mounting step (51), and the mounting step (51) has a horizontally arranged limiting wall (51a), and the limiting wall (51a) is located below the clamping ring (6) and abuts against the clamping ring (6).

3. The drill chuck according to claim 1 or 2, characterized in that: The hand-tightening sleeve (3) is provided with an inner sleeve (7), and the inner sleeve (7) is located between the hand-tightening sleeve (3) and the hand-tightening nut (4). The upper end of the hand-tightening sleeve (3) is bent to form a limiting ring (31), and the inner sleeve (7) has a limiting step (71). The limiting ring (31) is pressed on the limiting step (71) through the lower end of the mounting cap (5), and the outer surface of the hand-tightening sleeve (3) has an electrophoretic layer.

4. The drill chuck according to claim 3, characterized in that: The upper end of the inner sleeve (7) passes through the hand-tightening sleeve (3), and a clearance gap (8) is provided between the upper end of the inner sleeve (7) and the limiting wall (51a).

5. The drill chuck according to claim 1 or 2, characterized in that: The lower end of the hand-tightening sleeve (3) is tightly connected with a tail cover (9), the lower end of the drill body (1) has a columnar limiting portion (12), the inner side protrusion of the tail cover (9) is formed to be sleeved on the limiting column (91), the outer surface of the tail cover (9) has an oxide layer, and the phosphate protective layer of the drill body (1) is also coated with an oxide layer.

6. The drill chuck according to claim 5, characterized in that: The limiting portion (12) has an inwardly recessed clearance ring groove at a corner, and a spacing (10) is provided between the outer side wall of the limiting column (91) and the clearance ring groove.

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