Quick-change drill chuck

Abstract

The utility model relates to the technical field of drill chuck structures, in particular to a quick-change drill chuck, which is provided with a drill body, the rear end of the drill body is provided with an insertion groove for an electric drill spindle to insert, and the quick-change drill chuck is characterized in that a driving strip hole and a locking hole are arranged on the inner wall of the insertion groove, a driving ball and a locking ball are respectively arranged in the driving strip hole and the locking hole, and the locking ball is arranged in the locking hole. The outer side of the drill body is sleeved with a driving locking sleeve sliding front and back, the inner side of the driving locking sleeve is provided with a conical face for driving of the driving ball, an avoiding face for avoiding of the locking ball and a locking face for locking of the locking ball, and the drill bit has the advantages of being simple in structure, convenient to use, rapid to disassemble and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of drill chuck structures, in particular to a quick-change drill chuck. Background Art

[0002] As we all know, drill chucks are one of the commonly used accessories in the power tool industry. Ordinary drill chucks are threaded, and it takes a long time to thread up and down when replacing, and they need to be tightened vigorously to prevent loosening. Some quick-change drill chucks require pressing the switch device hard to clamp the chuck when connecting the chuck, which is also quite laborious. In addition, in order to ensure the stability of the quick-change function of the drill chuck, the quick-change structure design on the general drill chuck is complicated and the installation is cumbersome. In particular, the existing quick-change drill chucks need to push the quick-change parts on the chuck when installing and removing them. Therefore, the installation and removal process still has cumbersome problems. Summary of the invention

[0003] The utility model aims to solve the above-mentioned deficiencies in the prior art and provide a quick-change drill chuck which has a simple structure, is easy to use and can be quickly disassembled.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] A quick-change drill chuck is provided with a drill body, and an insertion groove for inserting a power drill shaft is provided at the rear end of the drill body. The characteristic is that a driving strip hole and a locking hole are provided on the inner wall of the insertion groove, and a driving ball and a locking ball are respectively provided in the driving strip hole and the locking hole, and a driving locking sleeve that slides back and forth is sleeved on the outer side of the drill body, and a conical surface for driving the driving ball, an avoidance surface for avoiding the locking ball, and a locking surface for locking the locking ball are respectively provided on the inner side of the driving locking sleeve.

[0006] After the electric drill shaft is inserted into the insertion slot of the drill body, the electric drill shaft pushes the driving ball to move forward in the driving strip hole, and at the same time, the driving ball contacts the tapered surface. The driving ball drives the tapered surface to move forward while driving the locking sleeve forward. The avoidance surface and the locking surface move forward at the same time, and the avoidance surface moves the locking ball to the locking surface. Finally, the locking surface locks the locking ball between the locking surface and the electric drill shaft. By pushing the locking sleeve backward, the locking ball is squeezed into the avoidance surface, and the tapered surface pushes the driving ball upward, and the electric drill shaft comes out.

[0007] The front and rear sides of the driving locking sleeve of the utility model are respectively provided with a front pressing spring and a rear pressing spring, and the front pressing spring and the rear pressing spring are respectively sleeved on the outside of the drill body at the front and rear sides of the driving locking sleeve.

[0008] The side surface of the electric drill shaft of the utility model is provided with a locking groove for locking with a locking ball.

[0009] The lower end side surface of the electric drill shaft of the utility model is provided with a pushing groove for driving a driving ball, and the groove top surface of the pushing groove is a pushing surface.

[0010] The driving locking sleeve of the utility model comprises a control sleeve and a tapered sleeve, wherein the tapered sleeve is arranged inside the control sleeve, the tapered surface for driving the driving ball is arranged on the tapered sleeve, and the avoidance surface for avoiding the locking ball and the locking surface for locking the locking ball are arranged on the control sleeve.

[0011] The control sleeve of the utility model comprises an anti-wear sleeve and a driving sleeve, wherein the anti-wear sleeve is arranged inside the driving sleeve and is integrally connected with the driving sleeve, and an avoidance surface for a locking ball to avoid and a locking surface for a locking ball to lock are arranged on the anti-wear sleeve.

[0012] The front compression spring and the rear compression spring on the front and rear sides of the driving locking sleeve of the utility model have different elastic force values, so as to realize the movement of the driving locking sleeve and the ejection effect of loosening the drill body and the electric drill shaft.

[0013] The rear sleeve and the front sleeve are fixedly sleeved on the drill body at the front and rear sides of the driving locking sleeve of the utility model, and the front and rear ends of the driving locking sleeve are respectively slidably sleeved with the front sleeve and the rear sleeve.

[0014] The bottom of the insertion groove of the utility model is connected to the polygonal shaft, the shaft end of the electric drill shaft is provided with a polygonal groove matched with the polygonal shaft, and the drill body realizes transmission between the electric drill shaft and the drill body through the plug-in cooperation between the polygonal shaft and the polygonal groove.

[0015] The inserting groove of the utility model has a polygonal groove at its bottom, the shaft end of the electric drill shaft is connected to a polygonal shaft matched with the polygonal groove, and the drill body realizes transmission between the electric drill shaft and the drill body through the plug-in cooperation between the polygonal shaft and the polygonal groove.

[0016] The utility model has the advantages of simple structure, convenient use, quick disassembly, etc. due to the adoption of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model.

[0018] Figure 2 It is a structural diagram of the drill body.

[0019] Figure 3 It is a structural diagram of the control sleeve.

[0020] Figure 4 It is a structural diagram of a tapered sleeve.

[0021] Figure 5 It is a structural diagram of an electric drill shaft. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings:

[0023] As shown in the accompanying drawings, a quick-change drill chuck is provided with a drill body 1, and an insertion groove 2 for inserting a power drill shaft 27 is provided at the rear end of the drill body 1, characterized in that a driving strip hole 3 and a locking hole 4 are provided on the inner wall of the insertion groove 2, and a driving ball 5 and a locking ball 6 are respectively provided in the driving strip hole 3 and the locking hole 4, and a driving locking sleeve that slides back and forth is sleeved on the outer side of the drill body 1, and a conical surface 28 for driving the driving ball 5, an avoidance surface 7 for avoiding the locking ball 6, and a locking surface 8 for locking the locking ball 6 are respectively provided on the inner side of the driving locking sleeve.

[0024] After the electric drill shaft 27 is inserted into the insertion groove of the drill body, the electric drill shaft 27 pushes the driving ball 5 to move forward in the driving bar hole 3, and at the same time, the driving ball 5 contacts the tapered surface 28. The driving ball 5 drives the tapered surface 28 forward while driving the locking sleeve forward. The avoidance surface 7 and the locking surface 8 move forward at the same time, the avoidance surface 7 slides over the locking ball, and the locking surface 8 is pressed on the top of the locking ball. Finally, the locking surface 8 locks the locking ball between the locking surface 8 and the locking groove 11 of the electric drill shaft 27; by pushing the locking sleeve backward, the locking ball is squeezed into the avoidance surface, and the tapered surface pushes the driving ball to move upward, and the electric drill shaft comes out.

[0025] Furthermore, a front compression spring 10 and a rear compression spring 9 are respectively provided on the front and rear sides of the driving locking sleeve, and the front compression spring 10 and the rear compression spring 9 are respectively sleeved on the outside of the drill body 1 on the front and rear sides of the driving locking sleeve.

[0026] Furthermore, a locking groove 11 for locking the locking ball 6 is provided on the side of the electric drill shaft 27 .

[0027] Furthermore, a push groove 12 for driving the driving ball 5 is provided on the lower end side of the electric drill shaft 27 , and the top surface of the push groove 12 is a push surface 13 .

[0028] Furthermore, the drive locking sleeve includes a control sleeve 14 and a tapered sleeve 15, wherein the tapered sleeve 15 is arranged inside the control sleeve 14, a tapered surface 28 for driving the driving ball 5 is arranged on the tapered sleeve 15, an avoidance surface 7 for avoiding the locking ball 6 and a locking surface 8 for locking the locking ball 6 are arranged on the control sleeve 14, and the control sleeve 14 and the tapered sleeve 15 are in contact but not connected, so as to ensure that when the control sleeve 14 is pushed backward, the tapered sleeve 15 pushes the tapered sleeve 15 and the driving ball 5 backward under the elastic force of the front compression spring 10, thereby pushing the electric drill shaft to pop out.

[0029] Furthermore, the control sleeve 14 includes an anti-wear sleeve and a driving sleeve. The anti-wear sleeve is arranged inside the driving sleeve and is integrally connected with the driving sleeve. The avoidance surface 7 for the locking ball 6 to avoid and the locking surface 8 for the locking ball 6 to lock are arranged on the anti-wear sleeve. The anti-wear sleeve only plays a role in preventing wear and increasing strength. Its structure is similar to the overall structure of the control sleeve after being connected with the driving sleeve. Therefore, the schematic diagram of the structure is not shown.

[0030] Furthermore, the front compression spring 10 and the rear compression spring 9 on the front and rear sides of the drive locking sleeve have different elastic force values, so as to realize the movement of the drive locking sleeve and the ejection effect of loosening the drill body 1 and the electric drill shaft 27.

[0031] Furthermore, a rear sleeve 16 and a front sleeve 17 are fixedly sleeved on the drill body 1 at the front and rear sides of the driving locking sleeve, and the front and rear ends of the driving locking sleeve are slidably sleeved with the front sleeve 17 and the rear sleeve 16 respectively.

[0032] Furthermore, the bottom of the insertion groove 2 is connected to the polygonal shaft 18, and the shaft end of the electric drill shaft 27 is provided with a polygonal groove 19 that cooperates with the polygonal shaft 18. The drill body 1 realizes the transmission of the electric drill shaft 27 and the drill body 1 through the plug-in cooperation of the polygonal shaft 18 and the polygonal groove 19.

[0033] Furthermore, a polygonal groove 19 is provided at the bottom of the insertion groove 2, and the shaft end of the electric drill shaft 27 is connected to the polygonal shaft 18 that cooperates with the polygonal groove 19. The drill body 1 realizes the transmission of the electric drill shaft 27 and the drill body 1 through the plug-in cooperation of the polygonal shaft 18 and the polygonal groove 19.

[0034] Due to the adoption of the above structure, when the drill body 1 and the electric drill shaft 27 are connected, it is only necessary to align the insertion groove 2 of the drill body 1 with the electric drill shaft 27 and push it in forcefully, without pulling out the drive locking sleeve. When the drill bit needs to be removed from the electric drill shaft 27, it is only necessary to push the drive locking sleeve backwards, and the drill bit can be removed from the electric drill shaft 27. This connection method makes it quick and convenient to install and remove the drill chuck, and has the advantages of simple structure, easy use, and quick disassembly. Example

[0035] A quick-change drill chuck is provided with a drill body 1. Other structures on the drill body 1 are the same as those in the prior art and are not described in detail. An insertion slot 2 for inserting a power drill shaft 27 is provided at the rear end of the drill body 1. A drive bar hole 3 and a locking hole 4 are provided on the inner wall of the insertion slot 2. A drive ball 5 and a locking ball 6 are provided in the drive bar hole 3 and the locking hole 4, respectively. The outer side of the drill body 1 is sleeved with a front sleeve 17, a drive locking sleeve, and a rear sleeve 16 in sequence from the front side to the rear side. The front sleeve 17 and the rear sleeve 16 are fixedly connected to the drill body 1. The rear sleeve 16 is fixed to the rear of the drill body 1 via a retaining ring 26. The driving locking sleeve is connected to the drill body 1 in a front-rear sliding manner, and the front and rear ends of the driving locking sleeve are respectively slidably sleeved with the front sleeve 17 and the rear sleeve 16. The driving locking sleeve includes a control sleeve 14 and a tapered sleeve 15. The tapered sleeve 15 is arranged inside the control sleeve 14. The tapered surface 28 driven by the driving ball 5 is arranged on the tapered sleeve 15. The avoidance surface 7 for the locking ball 6 to avoid and the locking surface 8 for the locking ball 6 to lock are arranged on the control sleeve 14. The drill body 1 behind the control sleeve 14 is sleeved with a rear compression spring 9, and the drill body 1 in front of the tapered sleeve 15 is sleeved with a front compression spring 10.

[0036] The conical surface 28, avoidance surface 7, and locking surface 8 mentioned above are arranged in sequence along the front-to-back direction of the drill body 1. The conical surface 28 is the position of the conical groove on the conical sleeve 15, the avoidance surface 7 is the avoidance groove on the control sleeve 14, and the locking surface 8 is a cylindrical surface on the control sleeve 14 whose inner diameter is smaller than the bottom of the avoidance groove. An avoidance slope 20 is provided between the locking surface 8 and the avoidance surface 7 to transitionally connect the locking surface 8 and the avoidance surface 7. The locking ball 6 can smoothly enter the avoidance surface 7 from the locking surface 8 or enter the locking surface 8 from the avoidance surface 7 through the avoidance slope 20.

[0037] The control sleeve 14 is provided with a contact surface 21 in contact with the upper end surface of the tapered sleeve 15 . The upper end surface 22 of the tapered sleeve 15 is in contact with the contact surface 21 of the control sleeve 14 .

[0038] The control sleeve 14 described above has a structure with a small diameter at the upper end and a large diameter at the lower end. The upper end of the control sleeve 14 is slidably connected to the inner wall of the rear sleeve 16, and the lower end of the control sleeve 14 is slidably connected to the outer wall of the front sleeve 17. A protrusion 23 is provided on the outer wall of the control sleeve 14 slidably connected to the front sleeve 17, and the protrusion 23 is for the operator to push.

[0039] The upper end surface 22 of the control sleeve 14 is provided with a positioning groove 24 for positioning the rear compression spring 9, and the rear compression spring 9 is inserted into the positioning groove 24 for positioning. The outer wall of the drill body 1 is provided with a positioning protrusion 25, and the lower end of the front compression spring 10 is positioned on the positioning protrusion 25 of the drill body 1.

[0040] The side of the electric drill shaft 27 is provided with a locking groove 11 for locking the locking ball 6 .

[0041] The lower end side surface of the electric drill shaft 27 is provided with a pushing groove 12 for driving the driving ball 5 , and the top surface of the pushing groove 12 is a pushing surface 13 , and the pushing surface 13 is an inclined surface, which is convenient for pushing the driving ball 5 .

[0042] Due to the existence of the pushing groove 12 , the electric drill shaft 27 is formed into a stepped shaft. Since the end diameter of the electric drill shaft 27 at the position of the pushing groove 12 is small, the driving ball 5 can be squeezed into the tapered sleeve 15 to facilitate driving the driving ball 5 .

[0043] The control sleeve 14 can be a split type, which includes an anti-wear sleeve and a driving sleeve. The anti-wear sleeve is arranged inside the driving sleeve and is integrally connected with the driving sleeve. The avoidance surface 7 for the locking ball 6 to avoid and the locking surface 8 for the locking ball 6 to lock are arranged on the anti-wear sleeve. The anti-wear is to increase the anti-wear strength of the locking surface 8 and the avoidance surface 7 and increase the service life.

[0044] The front compression spring 10 and the rear compression spring 9 on the front and rear sides of the driving locking sleeve have different elastic force values, so as to realize the movement of the driving locking sleeve and the ejection effect of loosening the drill body 1 and the electric drill shaft 27.

[0045] The bottom of the insertion groove 2 is connected to the polygonal shaft 18, and the shaft end of the electric drill shaft 27 is provided with a polygonal groove 19 that cooperates with the polygonal shaft 18. The drill body 1 realizes the transmission of the electric drill shaft 27 and the drill body 1 through the plug-in cooperation between the polygonal shaft 18 and the polygonal groove 19, or the bottom of the insertion groove 2 is provided with a polygonal groove 19, and the shaft end of the electric drill shaft 27 is connected to the polygonal shaft 18 that cooperates with the polygonal groove 19. The drill body 1 realizes the transmission of the electric drill shaft 27 and the drill body 1 through the plug-in cooperation between the polygonal shaft 18 and the polygonal groove 19.

[0046] When the drill chuck and the electric drill shaft 27 are connected, the pushing groove 12 of the electric drill shaft 27 pushes the driving ball 5 to the axial outside of the drill body 1, so that the driving ball 5 and the conical surface 28 of the conical sleeve 15 are attached together, and the driving ball 5 can push the conical sleeve 15 to move axially. The pushing surface 13 of the electric drill shaft 27 pushes the driving ball 5, drives the conical sleeve 15 and moves the front compression spring 10 in front of the conical sleeve 15 forward. Since a gap is generated between the upper end surface 22 of the conical sleeve 15 and the contact surface 21 of the control sleeve 14, the control sleeve 14 moves forward under the action of the rear compression spring 9. When the locking groove 11 of the electric drill shaft 27 moves to When the locking ball 6 is in the position, the locking ball 6 enters the locking groove 11 of the electric drill shaft 27 under the action of the avoidance slope 20 behind the avoidance groove of the control sleeve 14. At this time, the rear end surface of the drill body 1 and the end surface of the electric drill shaft 27 are close to each other, and the drill chuck stops moving. At this time, the locking surface 8 of the control sleeve 14 is pressed on the locking ball 6 to achieve the blocking of the locking ball 6. Since the locking ball 6 is stuck in the locking groove 11 of the electric drill shaft 27, the drill chuck and the electric drill shaft 27 are tightly connected. The transmission of the electric drill shaft 27 and the drill chuck is completed by the polygonal groove 19 of the electric drill shaft 27 and the polygonal shaft 18 of the drill body 1.

[0047] When the drill chuck needs to be removed, the raised portion 23 of the control sleeve 14 is pressed, the control sleeve 14 moves backward, and the locking ball 6 enters the avoidance surface 7 of the control sleeve 14. The front compression spring 10 pushes the conical sleeve 15, the driving ball 5, and the electric drill shaft 27 to move, so that the locking ball 6 comes out of the locking groove 11 of the electric drill shaft 27, thereby loosening the axial connection of the drill chuck, and the drill chuck and the electric drill shaft 27 are disconnected.

Claims

1. A quick-change drill chuck, comprising a drill body, a rear end of which is provided with an insertion slot for inserting a power drill shaft, characterized in that A driving bar hole and a locking hole are arranged on the inner wall of the insertion groove, and a driving ball and a locking ball are arranged in the driving bar hole and the locking hole respectively. A driving locking sleeve that slides back and forth is sleeved on the outer side of the drill body, and a conical surface for driving the driving ball, an avoidance surface for the locking ball to avoid, and a locking surface for locking the locking ball are arranged on the inner side of the driving locking sleeve.

2. A quick-change drill chuck according to claim 1, characterized in that The front and rear sides of the driving locking sleeve are respectively provided with a front pressing spring and a rear pressing spring, and the front pressing spring and the rear pressing spring are respectively sleeved on the outside of the drill body at the front and rear sides of the driving locking sleeve.

3. A quick-change drill chuck according to claim 1, characterized in that The side surface of the electric drill shaft is provided with a locking groove for locking the locking ball.

4. A quick-change drill chuck according to claim 1, characterized in that The lower end side surface of the electric drill shaft is provided with a pushing groove for driving the driving ball, and the groove top surface of the pushing groove is the pushing surface.

5. The quick-change drill chuck according to claim 1, characterized in that The driving locking sleeve comprises a control sleeve and a tapered sleeve, wherein the tapered sleeve is arranged inside the control sleeve, the tapered surface for driving the driving ball is arranged on the tapered sleeve, and the avoidance surface for the locking ball to avoid and the locking surface for the locking ball to lock are arranged on the control sleeve.

6. A quick-change drill chuck according to claim 5, characterized in that The control sleeve comprises an anti-wear sleeve and a driving sleeve. The anti-wear sleeve is arranged inside the driving sleeve and connected with the driving sleeve as a whole. The avoidance surface for the locking ball to avoid and the locking surface for the locking ball to lock are arranged on the anti-wear sleeve.

7. A quick-change drill chuck according to claim 2, characterized in that The front compression spring and the rear compression spring on the front and rear sides of the driving locking sleeve have different elastic force values, so as to realize the movement of the driving locking sleeve and the ejection effect of loosening the drill body and the electric drill shaft.

8. The quick-change drill chuck according to claim 1, characterized in that A rear sleeve and a front sleeve are fixedly sleeved on the drill body at the front and rear sides of the driving locking sleeve respectively, and the front and rear ends of the driving locking sleeve are respectively slidably sleeved with the front sleeve and the rear sleeve.

9. The quick-change drill chuck according to claim 1, characterized in that The bottom of the insertion groove is connected to the polygonal shaft, and the shaft end of the electric drill shaft is provided with a polygonal groove matched with the polygonal shaft. The drill body realizes transmission between the electric drill shaft and the drill body through the plug-in cooperation between the polygonal shaft and the polygonal groove.

10. The quick-change drill chuck according to claim 1, characterized in that The bottom of the insertion groove is provided with a polygonal groove, the shaft end of the electric drill shaft is connected to the polygonal shaft matching the polygonal groove, and the drill body realizes the transmission of the electric drill shaft and the drill body through the plug-in matching of the polygonal shaft and the polygonal groove.

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