CN111390215A - Hydraulic clamping drill chuck - Google Patents
Hydraulic clamping drill chuck Download PDFInfo
- Publication number
- CN111390215A CN111390215A CN202010396874.9A CN202010396874A CN111390215A CN 111390215 A CN111390215 A CN 111390215A CN 202010396874 A CN202010396874 A CN 202010396874A CN 111390215 A CN111390215 A CN 111390215A
- Authority
- CN
- China
- Prior art keywords
- hole
- expansion sleeve
- drill chuck
- pressurizing
- oil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
- B23B31/02—Chucks
- B23B31/24—Chucks characterised by features relating primarily to remote control of the gripping means
- B23B31/30—Chucks characterised by features relating primarily to remote control of the gripping means using fluid-pressure means in the chuck
- B23B31/305—Chucks characterised by features relating primarily to remote control of the gripping means using fluid-pressure means in the chuck the gripping means is a deformable sleeve
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
- B23B31/02—Chucks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
- B23B31/02—Chucks
- B23B31/24—Chucks characterised by features relating primarily to remote control of the gripping means
- B23B31/30—Chucks characterised by features relating primarily to remote control of the gripping means using fluid-pressure means in the chuck
Abstract
A hydraulic clamping drill chuck is characterized in that a connecting hole is formed in the rear end of a drill chuck body, an expansion sleeve hole is formed in the front end of the drill chuck body, an expansion sleeve is embedded in the expansion sleeve hole, two annular oil grooves are alternately formed in the outer circumference of the expansion sleeve, oil cavities are formed between the annular oil grooves and the inner circular surface of the expansion sleeve hole, and an axial oil duct is connected between the two annular oil grooves; the drill chuck body is provided with a pressurizing hole formed by a front unthreaded hole and a rear threaded hole, the front end part of the unthreaded hole of the pressurizing hole is provided with an inner oil duct communicated with an oil cavity, a piston is placed in the unthreaded hole of the pressurizing hole, a sealing ring is placed in a sealing ring groove of the unthreaded hole part of the pressurizing hole, the front part of the unthreaded hole of the pressurizing hole, the oil cavity and the inner oil duct are filled with hydraulic oil, and the threaded hole of the pressurizing hole is connected with a pressurizing screw through threads. According to the invention, the cutter can be easily locked and disassembled by only using one T-shaped hexagonal wrench, and the cutter can be quickly clamped, so that time and labor are saved; the expansion sleeve is adopted as the clamping component, so that the clamping device has the advantages of high precision and high rigidity, and can accurately position the cutter; the expansion sleeve adopts a two-point clamping mode, so that the clamping of the cutter is more stable.
Description
Technical Field
The invention relates to a drill chuck, in particular to a hydraulic clamping drill chuck which is used for clamping a shank type cutter.
Background
The drill chuck is one of the main fittings in electric tool industry and machine tool industry, is an accessory connected with a drilling tool for clamping handle tools, and is widely applied to electric hand drills and drilling machines. The connection mode of the drilling tool and the drilling tool comprises a threaded connection mode and a taper hole connection mode. According to the current chuck specification, the specification of the threaded connection is 3/8-24UNF, 1/2-20UNF, 5/8-16UNF and M12X1.25. The specification of taper hole connection includes B10, B12, B16, B18, B22, JT0, JT2, JT3, JT6, JT10, JT33 and the like. The threaded connection is mainly used on electric hand drills, and the taper hole connection is mainly used on drilling machines and machine tools. Typically, the accuracy requirements for bench drills and machine tools are somewhat higher, while the accuracy of chucks for hand drills is relatively lower.
At present, a drill chuck generally adopts a threaded connection mode to drive a clamping jaw to advance and retreat so as to clamp or loosen a cutter, and the clamping is mechanical clamping. The clamping force of the clamping jaw is limited, so that the transmission of the torsion is influenced; the threaded connection of the nut and the clamping jaw can be loosened due to vibration in use, so that the clamping of the tool is influenced; the clamping jaw is adopted for clamping, so that the centering precision of the cutter is not high. The invention patent with the patent number CN200410092816.8 discloses a hydraulic drill chuck, which comprises a clamping element, an oil pool, a front oil chamber and a rear oil chamber for clamping or loosening the clamping element, an oil injection mechanism of the front oil chamber and the rear oil chamber, an oil return passage, an oil injection mechanism and a reversing mechanism for communicating and switching the oil return passage with the front oil chamber and the rear oil chamber, wherein the oil injection mechanism comprises a one-way valve communicated with the oil pool and a one-way valve communicated with the reversing mechanism, and an oil injection piston is arranged between the two one-way valves. The hydraulic control part of the hydraulic drill chuck has a complex structure, so that the reliability is reduced and the manufacturing cost is high; the clamping element still adopts a multi-claw structure, and the centering precision of the clamped cutter is not improved.
Disclosure of Invention
The invention aims to provide a hydraulic drill chuck, which solves the defect that the centering precision of a clamping jaw type drill chuck on a clamped cutter is not high, solves the defect that the structure of the conventional hydraulic drill chuck is complex, improves the clamping stability of the cutter, reduces cutting vibration, prolongs the service life of the cutter and ensures the processing stability of a workpiece.
The object of the invention is achieved in the following way: the drill chuck is provided with a drill chuck body which is a rotary body, a connecting hole is arranged at the rear end of the drill chuck body, an expansion sleeve hole is arranged at the front end of the drill chuck body, the connecting hole and the expansion sleeve hole are concentric on the central line of the drill chuck body, an expansion sleeve is embedded in the expansion sleeve hole and is a sleeve body which is formed by an outer circumferential surface and a clamping hole in a concentric manner, two ends of the outer circumferential surface of the expansion sleeve are in sealing fit with the expansion sleeve hole, the expansion sleeve and the outer end of the expansion sleeve hole are fixedly welded, two annular oil grooves are alternately arranged on the outer circumference of the expansion sleeve, the annular oil grooves and the inner circumferential surface of the expansion sleeve hole form an oil cavity, and at least one axial oil duct is connected between; the drill chuck body is provided with a pressurizing hole, the center line of the pressurizing hole is vertical to the center line of the expansion sleeve hole and is spaced by a distance exceeding the radius of the pressurizing hole, namely the distance between the center line of the pressurizing hole and a parallel surface penetrating through the center line of the expansion sleeve hole is larger than the radius of the pressurizing hole, so that the pressurizing hole and the expansion sleeve hole are prevented from being communicated, a hydraulic oil circuit is ensured not to be communicated with the expansion sleeve hole at the end, the pressurizing hole consists of a smooth hole at the front part and a threaded hole at the rear part, an inner oil duct is arranged at the front end part of the smooth hole of the pressurizing hole and is communicated with the oil cavity, a cylindrical piston with proper diameter is placed in the smooth hole of the pressurizing hole, a sealing ring groove is arranged at the smooth hole part of the pressurizing hole, a sealing ring is placed in the sealing ring groove, the sealing ring is closely contacted with the outer circumferential surface of the piston to achieve the sealing, the screw hole of the pressurizing hole is connected with a pressurizing screw through a screw thread, and the front end of the pressurizing screw is propped against the rear end face of the piston. The invention can directly clamp the cutter with the diameter same as that of the clamping hole, and can clamp the cutter with the diameter smaller than that of the clamping hole by increasing the reducing sleeve. When the tool is used, the tool shank of a clamped tool is inserted into the clamping hole of the expansion sleeve, the pressurizing bolt is screwed inwards by a T-shaped wrench, the pressurizing bolt pushes the piston, the piston pushes hydraulic oil, the pressure of the hydraulic oil is uniformly transmitted to the expansion sleeve from the circumferential direction of the oil cavity, and the annular oil groove part of the expansion sleeve is subjected to inward shrinkage elastic deformation due to thin wall to clamp the tool; when the compression screw is rotated reversely, the pressure of hydraulic oil in the oil cavity is reduced, and the cutter is taken out after the expansion sleeve is not stressed.
The annular belt part where the pressurizing hole is arranged on the drill chuck body is provided with a counterweight groove, the counterweight groove is used for embedding a counterweight, the requirement of adjusting dynamic balance is met through adjusting the mass of the counterweight, and the dynamic balance meets the requirement of high-speed rotation.
And a through hole is communicated between the connecting hole of the drill chuck body and the expansion sleeve hole, so that the exhaust is convenient when the cutter is clamped.
And a plurality of annular grooves are alternately arranged on the inner hole wall of the clamping hole of the expansion sleeve. When the cutter is clamped, the residual parts of lubricants such as oil, grease and the like are squeezed into the annular grooves by the huge pressure generated between the inner wall of the clamping hole and the clamped cutter, so that the cleanness and the dryness of the wall of the clamping hole are kept.
The outer end part of the expansion sleeve hole is a stepped hole, the tail end of the expansion sleeve is a stepped column matched with the expansion sleeve hole, and the structure can strengthen the axial bearing force of the expansion sleeve relative to the expansion sleeve hole.
The outer circumference of the middle part of the drill chuck body is a knurled surface, so that friction force is increased when the drill chuck body is used for grasping, and the drill chuck body is not easy to fall off after being grasped.
A hand-held rotating sleeve is fixed on the outer circumference of the rear end of the drill chuck body, so that an operator can conveniently grab the drill chuck body.
The inner hole of the expansion sleeve is provided with a reducing sleeve, the outer peripheral surface of the reducing sleeve is matched with the inner hole of the expansion sleeve, and the inner hole of the reducing sleeve is a sleeve body matched with a tool holder of a tool to be installed and used for installing the tool with the small diameter.
After the tool is arranged in the tool, the tool can be easily locked and disassembled by only using a T-shaped hexagonal wrench, and the tool can be quickly clamped and is time-saving and labor-saving; the expansion sleeve is adopted as the clamping component, so that the clamping device has the advantages of high precision and high rigidity, can accurately position the cutter, and improves the transmission precision of the drill chuck; the expansion sleeve adopts a two-point clamping mode, so that the clamping of the cutter is more stable. Cutting vibration is reduced, the service life of the cutter can be prolonged, and the processing stability of the workpiece is ensured.
Drawings
Fig. 1 is a front view of the present invention.
Fig. 2 is a top view of the present invention.
Fig. 3 is a sectional view taken along line a-a in fig. 1.
Fig. 4 is a schematic structural view of the reducing bush.
Fig. 5 is a schematic view of an allen wrench.
In the figure: 1-a drill chuck body; 2-connecting holes; 3-sealing ring; 4-compression screw; 5-a piston; 6-oil chamber; 7-expansion sleeve; 8-ring groove; 9-an inner oil duct; 10-holding the rotating sleeve by hand; 11-counterweight groove; 12-knurled surface; 13-reducing sleeve.
Detailed Description
Referring to fig. 1, 2, 3 and 5, a drill chuck body 1 is a revolving body, the outer circumference of the middle part of the drill chuck body 1 is a knurled surface 12 for firm gripping, a hand-held rotary sleeve 10 is fixed on the outer circumference of the rear end of the drill chuck body 1, the hand-held rotary sleeve 10 can be installed on the drill chuck body 1 in a transition fit manner and then fixed by a pin, a connecting hole 2 is arranged at the rear end of the drill chuck body 1, an expansion sleeve hole is arranged at the front end of the drill chuck body 1, the connecting hole 2 and the expansion sleeve hole are concentric with the central line of the drill chuck body 1, a through hole is communicated between the connecting hole 2 and the expansion sleeve hole, an expansion sleeve 7 is embedded in the expansion sleeve hole, the expansion sleeve 7 is a sleeve body formed by concentrically arranging an outer circumferential surface and a clamping hole, two ends of the outer circumferential surface of the expansion sleeve 7 are in sealing fit with the expansion sleeve hole, the outer end part of the expansion sleeve hole is a stepped, the expansion sleeve 7 is fixed with the outer end joint seam of the expansion sleeve hole by welding, two annular oil grooves are alternately arranged on the outer circumference of the expansion sleeve 7, oil cavities 6 are formed by the annular oil grooves and the inner circular surface of the expansion sleeve hole, an axial oil passage is connected between the two annular oil grooves, and a plurality of annular grooves 8 are alternately arranged on the inner hole wall of the clamping hole of the expansion sleeve 7; the drill chuck body 1 is provided with a pressurizing hole, the center line of the pressurizing hole is vertical to the center line of the expansion trepanning and is spaced at a distance larger than the radius of the expansion trepanning, the pressurizing hole is composed of a unthreaded hole at the front part and a threaded hole at the rear part, the front end part of the unthreaded hole of the pressurizing hole is provided with an inner oil duct 9 communicated with an oil cavity 6, a cylindrical piston 5 with proper diameter is placed in the unthreaded hole of the pressurizing hole, the unthreaded hole part of the pressurizing hole is provided with a sealing ring groove, the sealing ring 3 is placed in a groove of the sealing ring, the sealing ring 3 is sealed with the outer circumferential surface of the piston 5, hydraulic oil is filled in the front end of a unthreaded hole of the pressurizing hole, the oil cavity 6, the inner oil duct 9 and the axial oil duct between the two annular oil grooves, the pressurizing screw 4 is connected in the threaded hole of the pressurizing hole through threads, the front end of the pressurizing screw 4 is propped against the rear end surface of the piston 5, the pressurizing screw 4 is a cylindrical screw with a hexagonal counter bore at the rear end, and the pressurizing screw 4 can be rotated by using a hexagonal T-shaped hexagonal wrench shown in figure 5.
Referring to fig. 4, when a tool with a small drill shank diameter needs to be clamped, the reducing sleeve 13 is used for reducing clamping, the outer peripheral surface of the reducing sleeve 13 is matched with the inner hole of the expansion sleeve 7, the inner hole of the reducing sleeve 13 is a sleeve body matched with a tool shank to be mounted, the reducing sleeve 13 is inserted into the inner hole of the expansion sleeve 7, the tool shank is inserted into the inner hole of the reducing sleeve 13 to realize reducing clamping, and tools with other sizes are convenient to replace. When the reducing sleeve 13 is used, two water outlet modes, namely central water outlet and annular water spraying, can be used.
Claims (8)
1. A hydraulic clamping drill chuck is provided with a drill chuck body which is a revolving body, and is characterized in that: the rear end of the drill chuck body (1) is provided with a connecting hole (2), the front end of the drill chuck body (1) is provided with an expansion sleeve hole, the connecting hole (2) and the expansion sleeve hole are concentric on the central line of the drill chuck body (1), an expansion sleeve (7) is embedded in the expansion sleeve hole, the expansion sleeve (7) is a sleeve body formed by an outer circumferential surface and a clamping hole which are concentric, two ends of the outer circumferential surface of the expansion sleeve (7) are in sealing fit with the expansion sleeve hole, the expansion sleeve (7) is fixed with the outer end joint seam of the expansion sleeve hole by welding, two annular oil grooves are arranged on the outer circumference of the expansion sleeve (7) at intervals, an oil cavity (6) is formed by the annular oil grooves and the inner circumferential surface of the expansion sleeve hole, and at least one axial oil duct is communicated between the; the drill chuck body (1) is provided with a pressurizing hole, the center line of the pressurizing hole is vertical to the center line of the expansion sleeve hole and is spaced at a distance exceeding the radius of the pressurizing hole, the pressurizing hole is composed of a smooth hole at the front part and a threaded hole at the rear part, the front end part of the smooth hole of the pressurizing hole is provided with an inner oil duct (9) communicated with an oil cavity (6), a cylindrical piston (5) with proper diameter is placed in the smooth hole of the pressurizing hole, the smooth hole part of the pressurizing hole is provided with a sealing ring groove, a sealing ring (3) is arranged in a groove of the sealing ring, the sealing ring (3) is closely contacted with the outer circumferential surface of a piston (5) to achieve the purpose of sealing, hydraulic oil is filled in a part of a unthreaded hole of a pressurizing hole, which is positioned in front of the sealing ring (3), an oil cavity (6), an inner oil duct (9) and an axial oil duct between two annular oil grooves, a pressurizing screw (4) is connected in a threaded hole of the pressurizing hole through threads, and the front end of the pressurizing screw (4) is propped against the rear end surface of the piston (5).
2. The hydraulic clamping drill chuck as claimed in claim 1, wherein: a counterweight groove (11) is arranged on the annular belt part where the pressurizing hole is positioned on the drill chuck body (1).
3. The hydraulic clamping drill chuck as claimed in claim 1, wherein: a through hole is communicated between the connecting hole of the drill chuck body (1) and the expansion sleeve hole.
4. The hydraulic clamping drill chuck as claimed in claim 1, wherein: a plurality of ring grooves (8) are alternately arranged on the inner hole wall of the clamping hole of the expansion sleeve (7).
5. The hydraulic clamping drill chuck as claimed in claim 1, wherein: the outer end part of the expansion sleeve hole is a stepped hole, and the tail end of the expansion sleeve (7) is a stepped column matched with the expansion sleeve hole.
6. The hydraulic clamping drill chuck as claimed in claim 1, wherein: the outer circumference of the middle part of the drill chuck body (1) is a knurling surface (12).
7. The hydraulic clamping drill chuck as claimed in claim 1, wherein: a hand-held rotating sleeve (10) is fixed on the outer circumference of the rear end of the drill chuck body (1).
8. The hydraulic clamping drill chuck as claimed in claim 1, wherein: the inner hole of the expansion sleeve (7) is provided with a reducing sleeve (13), the outer peripheral surface of the reducing sleeve (13) is matched with the inner hole of the expansion sleeve (7), and the inner hole is a sleeve body matched with a tool shank to be provided with a tool.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010396874.9A CN111390215A (en) | 2020-05-12 | 2020-05-12 | Hydraulic clamping drill chuck |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010396874.9A CN111390215A (en) | 2020-05-12 | 2020-05-12 | Hydraulic clamping drill chuck |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111390215A true CN111390215A (en) | 2020-07-10 |
Family
ID=71418748
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010396874.9A Pending CN111390215A (en) | 2020-05-12 | 2020-05-12 | Hydraulic clamping drill chuck |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111390215A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1347353A (en) * | 2000-02-16 | 2002-05-01 | 夹紧工具工厂申克两合公司 | Expansion chuck tool |
| CN1676254A (en) * | 2004-11-15 | 2005-10-05 | 浙江三鸥机械股份有限公司 | Hydraulic drill chuck |
| CN103747902A (en) * | 2011-05-25 | 2014-04-23 | 大昭和精机株式会社 | Holder device |
| CN104174888A (en) * | 2013-05-28 | 2014-12-03 | 钴碳化钨硬质合金公司 | Hydraulic chuck with a reduction sleeve |
| CN104308582A (en) * | 2014-10-17 | 2015-01-28 | 芜湖洪金机床有限公司 | Hydraulic chuck for machine tool |
| JP2015054385A (en) * | 2013-09-13 | 2015-03-23 | 三菱マテリアル株式会社 | Cutting tool |
| CN107486568A (en) * | 2017-09-06 | 2017-12-19 | 江苏高和智能装备股份有限公司 | A kind of machine tool hydraulic chuck |
-
2020
- 2020-05-12 CN CN202010396874.9A patent/CN111390215A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1347353A (en) * | 2000-02-16 | 2002-05-01 | 夹紧工具工厂申克两合公司 | Expansion chuck tool |
| CN1676254A (en) * | 2004-11-15 | 2005-10-05 | 浙江三鸥机械股份有限公司 | Hydraulic drill chuck |
| CN103747902A (en) * | 2011-05-25 | 2014-04-23 | 大昭和精机株式会社 | Holder device |
| CN104174888A (en) * | 2013-05-28 | 2014-12-03 | 钴碳化钨硬质合金公司 | Hydraulic chuck with a reduction sleeve |
| JP2015054385A (en) * | 2013-09-13 | 2015-03-23 | 三菱マテリアル株式会社 | Cutting tool |
| CN104308582A (en) * | 2014-10-17 | 2015-01-28 | 芜湖洪金机床有限公司 | Hydraulic chuck for machine tool |
| CN107486568A (en) * | 2017-09-06 | 2017-12-19 | 江苏高和智能装备股份有限公司 | A kind of machine tool hydraulic chuck |
Non-Patent Citations (1)
| Title |
|---|
| 顾志坤: "《机械产品学》", 31 March 1994 * |
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| Date | Code | Title | Description |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200710 |
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| RJ01 | Rejection of invention patent application after publication |