A new depth adjustable slot milling tool holder
By designing an adjustable height milling shank and a labyrinth air seal structure, the problems of tool height adjustment and dust protection were solved, enabling the machining of uneven workpieces and the protection of bearings.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGZHOU RUIHENG SCI&TECH CO LTD
- Filing Date
- 2025-05-30
- Publication Date
- 2026-06-12
AI Technical Summary
Existing milling cutter holders cannot adjust the tool height, making it impossible to machine irregular workpieces with uneven surfaces. Furthermore, during the machining process, chips and dust can easily enter the inside of the cutter holder and damage the bearings.
An adjustable height milling shank was designed, which achieves tool depth adjustment and dust protection through a height adjustment seat and a labyrinth air seal structure.
It enables the machining of grooves at a fixed depth on uneven workpieces, extends the service life of the tool holder, and effectively prevents dust from entering and damaging the bearings.
Smart Images
Figure CN224347012U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of CNC machine tool technology, specifically to a novel milling tool holder with a fixed depth. Background Technology
[0002] A milling cutter holder is an important component used to connect a milling cutter to a machine tool spindle. It primarily uses specific mechanical structures or physical actions to firmly fix the cutter to the holder and transmit the rotational motion and power of the machine tool spindle to the cutter to achieve milling. However, existing milling cutter holders cannot adjust the cutter height, making it impossible to machine grooves of a fixed depth when machining irregular workpieces with uneven surfaces. Furthermore, the milling process generates a lot of chips and dust, which can easily enter the cutter holder through gaps, damaging internal components such as bearings. Utility Model Content
[0003] The purpose of this utility model is to provide a new type of milling tool holder with a fixed depth to address the shortcomings of the existing technology and solve the problems mentioned in the background art.
[0004] To achieve this objective, the present invention adopts the following technical solution:
[0005] A novel depth-determinable milling tool holder includes a tool holder, a bearing mounted on the outer surface of the tool holder, a bearing housing mounted on the outer surface of the bearing, a flexible collet mounted at one end of the tool holder, the flexible collet holding the tool, a height adjustment seat threadedly connected to the outer wall of the bearing housing, an adjustment seat outer sleeve mounted at the bottom end of the height adjustment seat, a through hole at the bottom end of the adjustment seat outer sleeve, the tool passing through the through hole and protruding from the outer surface of the adjustment seat outer sleeve, the height adjustment seat can drive the adjustment seat outer sleeve to move up and down along the bearing housing to adjust the length of the tool protruding from the adjustment seat outer sleeve.
[0006] As a preferred embodiment of a novel milling tool holder with a fixed depth, a bushing is installed at the bottom end of the bearing, the bushing is fitted onto the tool holder, an outer ring cap is installed on the outer ring of the bottom end of the bearing, an inner bearing housing is installed on the inner wall of the bearing housing above the bearing, the inner bearing housing is located above the bearing and fitted onto the tool holder.
[0007] As a preferred embodiment of the novel depth-determinable milling tool holder, the side wall of the height adjustment seat is provided with an adjustment hole, and a set screw is installed in the internal thread of the adjustment hole. The set screw passes through the adjustment hole and abuts against the side of the bearing seat to fix the height adjustment seat.
[0008] As a preferred embodiment of a novel milling tool holder with a fixed depth, the bottom end of the tool holder is provided with a tapered hole, the elastic collet is inserted into the tapered hole, and is fixedly connected to the tool holder by a collet locking nut.
[0009] As a preferred embodiment of a novel milling tool holder with a fixed depth, an air guide column is installed at the top of the bearing housing, the air guide column has an air guide hole, a transverse air hole is opened on the side wall of the bearing housing, a first air hole is opened on the side wall of the inner sleeve of the bearing housing, and a first labyrinth air seal slit is provided between the tool holder and the inner sleeve of the bearing housing, and the air guide hole, the transverse air hole, the first air hole and the first labyrinth air seal slit are connected in sequence.
[0010] As a preferred embodiment of a novel milling tool holder with a fixed depth, the bearing housing is provided with a longitudinal air hole along its length, and an annular groove is provided near the bearing outer ring cover. The bearing outer ring cover is provided with a second air hole, and a second labyrinth air seal slit is provided between the bushing and the bearing outer ring cover. The air guide hole, longitudinal air hole, annular groove, second air hole and second labyrinth air seal slit are connected in sequence.
[0011] As a preferred embodiment of the novel milling tool holder with a fixed depth, the bearing is a deep groove ball bearing, and the bearing is in close contact with the shoulder of the tool holder.
[0012] The beneficial effects of this utility model are:
[0013] (1) This utility model adopts a height adjustment seat structure design. By adjusting the position of the height adjustment seat, the outer sleeve of the adjustment seat can be moved up and down, thereby adjusting the height difference between the tool and the outer sleeve of the adjustment seat. When the tool is used, it can process grooves of fixed depth on irregular workpieces with uneven heights, making it more applicable.
[0014] (2) This utility model adopts a dustproof and heat dissipation functional structure. Compressed air enters through the air guide hole of the air guide column and enters the transverse air hole and the longitudinal air hole of the bearing seat respectively. One stream of compressed air enters the inner sleeve of the bearing seat through the transverse air hole. The inner sleeve of the bearing seat has a first air hole that blows the compressed air towards the first labyrinth air seal slit, forming an air seal effect on the upper end of the tool holder. The other stream of compressed air enters the annular groove through the longitudinal air hole, and then enters the outer ring cover of the bearing through the annular groove. The outer ring cover of the bearing has a second air hole that blows the compressed air towards the second labyrinth air seal slit, forming an air seal effect on the lower end of the tool holder as well. This can effectively prevent dust from entering the inside of the tool holder and damaging the bearing. Attached Figure Description
[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments of this utility model will be briefly described below. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.
[0016] Figure 1 This is a schematic diagram of the overall structure of the novel milling tool holder with a fixed depth as described in this utility model.
[0017] Figure 2 This is a schematic diagram of the bearing structure described in this utility model.
[0018] Figure 3 This is a schematic diagram of the relevant structure of the knife handle described in this utility model.
[0019] Figure 4 yes Figure 1 Enlarged view of the structure of part A in the middle.
[0020] Figure 5 yes Figure 2 Enlarged view of the structure of section B.
[0021] In the picture:
[0022] 1. Tool holder; 2. Bearing; 3. Bearing housing; 4. Elastic collet; 5. Tool; 6. Height adjustment seat; 7. Adjustment seat outer sleeve; 8. Bushing; 9. Bearing outer ring cover; 10. Bearing housing inner sleeve; 11. Set screw; 12. Collet lock nut; 13. Air guide column; 14. Air guide hole; 15. Transverse air hole; 16. First air hole; 17. First labyrinth seal slit; 18. Longitudinal air hole; 19. Annular groove; 20. Second air hole; 21. Second labyrinth seal slit. Detailed Implementation
[0023] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.
[0024] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of this utility model, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.
[0025] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.
[0026] In the description of this utility model, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating the connection relationship between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0027] like Figures 1 to 3 As shown, this utility model provides a novel milling tool holder with a fixed depth, including a tool holder 1. One end of the tool holder 1 can be mounted on a machine tool spindle, and the tool holder 1 is driven to rotate by the machine tool spindle. A bearing 2 is installed on the outer surface of the tool holder 1, and a bearing seat 3 is installed on the outer surface of the bearing 2. An elastic collet 4 is installed on the other end of the tool holder 1. The elastic collet 4 holds the tool 5, and the tool holder 1 can drive the tool 5 to rotate together through the elastic collet 4.
[0028] Preferably, in this embodiment, the outer wall of the bearing housing 3 is threadedly connected to a height adjustment seat 6, and an adjustment seat outer sleeve 7 is installed at the bottom end of the height adjustment seat 6. A through hole is opened at the bottom end of the adjustment seat outer sleeve 7, and the cutting tool 5 passes through the through hole and protrudes from the outer surface of the adjustment seat outer sleeve 7. When it is necessary to adjust the machining depth of the cutting tool 5, the operator can drive the adjustment seat outer sleeve 7 to move up and down along the bearing housing 3 through the height adjustment seat 6, thereby adjusting the length of the cutting tool 5 protruding from the adjustment seat outer sleeve 7. This allows for the machining of grooves of a fixed depth on uneven and irregular workpieces, making it more versatile.
[0029] Specifically, to prevent the height adjustment seat 6 from shifting or loosening, the side wall of the height adjustment seat 6 in this embodiment is also provided with an adjustment hole. A set screw 11 is installed in the internal thread of the adjustment hole. When the height adjustment seat 6 is adjusted to the required height, the operator screws the set screw 11 through the adjustment hole and abuts against the side of the bearing seat 3, thereby fixing the height adjustment seat 6.
[0030] More specifically, in this embodiment, a bushing 8 is also installed at the bottom end of the bearing 2. The bushing 8 is fitted onto the tool holder 1. The bushing 8 can reduce the direct friction and wear between the tool holder 1 and the bearing 2, and extend the service life of the tool holder 1. A bearing outer ring cover 9 is also installed on the outer ring of the bottom end of the bearing 2. The bearing outer ring cover 9 can lock and fix the bearing 2 to prevent the bearing 2 from axially displacing in the bearing seat 3, and can also play a sealing role. A bearing seat inner sleeve 10 is installed on the inner wall of the bearing seat 3 above the bearing 2. The bearing seat inner sleeve 10 is located above the bearing 2 and fitted onto the tool holder 1. The bearing seat inner sleeve 10 can position the tool holder 1.
[0031] More specifically, in this embodiment, the bottom end of the tool handle 1 is provided with a tapered hole, the elastic collet 4 is inserted into the tapered hole, and is fixedly connected to the tool handle 1 by the collet locking nut 12, thereby fixing the elastic collet 4 on the tool handle 1.
[0032] like Figure 4 As shown, to prevent dust from entering the inside of the handle 1 and damaging the bearing 2, an air guide column 13 is installed at the top of the bearing housing 3 in this embodiment. The air guide column 13 has an air guide hole 14. A transverse air hole 15 is provided on the side wall of the bearing housing 3. A first air hole 16 is provided on the side wall of the inner sleeve 10 of the bearing housing. A first labyrinth air seal slit 17 is provided between the handle 1 and the inner sleeve 10 of the bearing housing. The air guide hole 14, the transverse air hole 15, the first air hole 16 and the first labyrinth air seal slit 17 are connected in sequence. Compressed air can enter the transverse air hole 15 of the bearing housing 3 through the air guide hole 14 of the air guide column 13, and enter the inner sleeve 10 of the bearing housing through the transverse air hole 15. The inner sleeve 10 of the bearing housing has a ring of first air holes 16 that blow the compressed air toward the first labyrinth air seal slit 17, thereby forming an air seal effect on the upper end of the handle 1.
[0033] like Figure 5 As shown, in this embodiment, the bearing housing 3 is provided with a longitudinal air hole 18 along its length direction, and the bearing housing 3 is provided with an annular groove 19 near the bearing outer ring cover 9. The bearing outer ring cover 9 is provided with a second air hole 20. A second labyrinth air seal slit 21 is provided between the bushing 8 and the bearing outer ring cover 9. The air guide hole 14, the longitudinal air hole 18, the annular groove 19, the second air hole 20 and the second labyrinth air seal slit 21 are connected in sequence. Compressed air can enter the longitudinal air hole 18 of the bearing housing 3 through the air guide hole 14 of the air guide column 13, and enter the annular groove 19 through the longitudinal air hole 18, and then enter the bearing outer ring cover 9 through the annular groove 19. The bearing outer ring cover 9 has a ring of second air holes 20 that blow the compressed air toward the second labyrinth air seal slit 21, which also forms an air seal effect on the lower end of the tool holder 1.
[0034] Preferably, the bearing 2 in this embodiment is a deep groove ball bearing, and the bearing 2 is in close contact with the shoulder of the tool holder 1.
[0035] It should be stated that the above-described specific embodiments are merely preferred embodiments of this utility model and the technical principles employed. Those skilled in the art should understand that various modifications, equivalent substitutions, and variations can be made to this utility model. However, such variations, as long as they do not depart from the spirit of this utility model, should be within the protection scope of this utility model. Furthermore, some terminology used in this application specification and claims is not limiting, but merely for ease of description.
Claims
1. A novel milling tool holder with a fixed depth, characterized in that, The tool includes a handle (1), a bearing (2) is mounted on the outer surface of the handle (1), a bearing seat (3) is mounted on the outer surface of the bearing (2), an elastic collet (4) is mounted on one end of the handle (1), the elastic collet (4) holds the tool (5), a height adjustment seat (6) is threaded to the outer wall of the bearing seat (3), an adjustment seat outer sleeve (7) is mounted on the bottom end of the height adjustment seat (6), a through hole is opened at the bottom end of the adjustment seat outer sleeve (7), the tool (5) passes through the through hole and protrudes from the outer surface of the adjustment seat outer sleeve (7), the height adjustment seat (6) can drive the adjustment seat outer sleeve (7) to move up and down along the bearing seat (3) to adjust the length of the tool (5) protruding from the adjustment seat outer sleeve (7).
2. The novel milling tool holder with a fixed depth according to claim 1, characterized in that, A bushing (8) is installed at the bottom end of the bearing (2), and the bushing (8) is fitted onto the tool holder (1). A bearing outer ring cap (9) is also installed on the outer ring of the bottom end of the bearing (2). A bearing seat inner sleeve (10) is installed on the inner wall of the bearing seat (3) above the bearing (2). The bearing seat inner sleeve (10) is located above the bearing (2) and is fitted onto the tool holder (1).
3. The novel milling tool holder with a fixed depth according to claim 1, characterized in that, The height adjustment seat (6) has an adjustment hole on its side wall. A set screw (11) is installed in the adjustment hole. The set screw (11) passes through the adjustment hole and abuts against the side of the bearing seat (3) to fix the height adjustment seat (6).
4. The novel milling tool holder with a fixed depth according to claim 1, characterized in that, The bottom end of the tool handle (1) has a tapered hole, the elastic collet (4) is inserted into the tapered hole, and is fixedly connected to the tool handle (1) by the collet locking nut (12).
5. The novel milling tool holder with a fixed depth according to claim 2, characterized in that, An air guide column (13) is installed at the top of the bearing housing (3). The air guide column (13) has an air guide hole (14). A transverse air hole (15) is opened on the side wall of the bearing housing (3). A first air hole (16) is opened on the side wall of the bearing housing inner sleeve (10). A first labyrinth air seal slit (17) is provided between the knife handle (1) and the bearing housing inner sleeve (10). The air guide hole (14), the transverse air hole (15), the first air hole (16) and the first labyrinth air seal slit (17) are connected in sequence.
6. The novel milling tool holder with a fixed depth according to claim 5, characterized in that, The bearing housing (3) is provided with a longitudinal air hole (18) along its length direction, and the bearing housing (3) is provided with an annular groove (19) near the bearing outer ring cover (9). The bearing outer ring cover (9) is provided with a second air hole (20). A second labyrinth air seal slit (21) is provided between the bushing (8) and the bearing outer ring cover (9). The air guide hole (14), the longitudinal air hole (18), the annular groove (19), the second air hole (20) and the second labyrinth air seal slit (21) are connected in sequence.
7. The novel milling tool holder with a fixed depth according to claim 1, characterized in that, The bearing (2) is a deep groove ball bearing, and the bearing (2) is in close contact with the shoulder of the tool holder (1).