Milling machine head milling cutter protective sheath and milling machine head milling cutter

Abstract

The utility model discloses a milling machine head milling cutter protective sheath and a milling machine head milling cutter, which belong to the technical field of surgical equipment. It solves the defect of the conventional milling cutter in the prior art that the milling cutter is easily deformed when subjected to a large radial force, so that the circular runout becomes larger or even directly breaks. Its main structure includes a milling machine head front cap, a protective sheath assembly, a spindle and a milling cutter mounted on the spindle, one end of the spindle is mounted in the milling machine head front cap through a bearing one, a bearing two is arranged between the milling cutter and the milling machine head front cap, one end of the milling machine head front cap is mounted in the protective sheath assembly, the protective sheath assembly includes a protective sheath, one end of the milling machine head front cap is connected to the protective sheath, the head of the protective sheath is provided with a fixing groove, and the head of the milling cutter is arranged in the fixing groove. The utility model is mainly used for bone tissue surgical equipment products or battery-powered bone tissue equipment in the medical industry.

Description

Technical Field

[0001] The utility model belongs to the technical field of surgical equipment, and in particular relates to a milling machine head and milling cutter protective sheath and a milling machine head and milling cutter thereof. Background Art

[0002] The milling cutter protective sheaths currently on the market do not support the milling cutter. For example, the structure of a bone milling cutter protective sheath disclosed in the Chinese design patent with application number CNCN202230327035.1 has a single cantilever structure. When subjected to a large radial force, the milling cutter is easily deformed, resulting in a larger circular runout, and may even break directly. In addition, most of the milling cutter protective sheaths on the market are steel ball locking type, which only have outer edge position constraints but no inner hole position constraints. When the milling machine head vibrates at high speed, there is a risk that the protective sheath will continue to rotate with the vibration. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a milling machine head milling cutter protective sheath and a milling machine head milling cutter.

[0004] In order to achieve the above purpose, the utility model is implemented by adopting the following technical solutions:

[0005] A milling machine head and milling cutter protective sheath comprises a milling machine head front cap, a protective sheath assembly, a spindle and a milling cutter mounted on the spindle, one end of the spindle is mounted in the milling machine head front cap through a bearing 1, a bearing 2 is arranged between the milling cutter and the milling machine head front cap, one end of the milling machine head front cap is mounted in the protective sheath assembly, the protective sheath assembly comprises a protective sheath, one end of the milling machine head front cap is connected to the protective sheath, a fixing groove is arranged at the head of the protective sheath, and the head of the milling cutter is arranged in the fixing groove.

[0006] Preferably, the protective sheath assembly also includes a push-pull sleeve and a locking inner cylinder, the front cap of the milling machine head is connected to the locking inner cylinder, the outer ring of the locking inner cylinder is connected to the push-pull sleeve through a spring, a locking nut is arranged between the end of the locking inner cylinder and the end of the push-pull sleeve, and the inner ring of the locking nut resists the protective sheath.

[0007] Preferably, a steel ball embedding groove is provided between the push-pull sleeve and the protective sheath, and a steel ball is installed in the steel ball embedding groove.

[0008] Preferably, the outer ring of the front cap of the milling machine head is connected to the inner ring of the locking inner cylinder through threads.

[0009] Preferably, the first bearing and the second bearing are both deep groove ball bearings.

[0010] A milling machine head milling cutter comprises a shell component, on which a milling machine head milling cutter protective sheath as described in any one of the above items is installed.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] 1. The push-pull sleeve is lifted upward to the limit position by the spring, and the push-pull sleeve squeezes the steel ball into the steel ball embedding groove, locking the position relationship between the protective sheath and the front cap of the milling machine head. The locking plane distance is long enough to ensure that the push-pull sleeve can still press the steel ball with the plane within the vibration and accidental touch movement distance of ≤1.5mm to ensure that the steel ball does not fall out of the steel ball embedding groove;

[0013] 2. The limit position of bearing 1 and bearing 2 ensures that the milling cutter will not undergo large elastic deformation when subjected to large radial loads, so that the radial circular runout is reduced during load operation, the milled bone gap is narrower, and it is more conducive to the healing of the bone gap after surgery;

[0014] 3. A fixed groove is opened at the head end of the protective sheath, and the diameter is slightly larger than the thickness of the bladeless core of the milling cutter. When the milling cutter is subjected to a large radial force, the bladeless section of the milling cutter will fit into the fixed groove of the protective sheath. The protective sheath provides additional head support for the milling cutter, reducing the risk of accidental breakage caused by periodic bending and force changes of the milling cutter. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the milling cutter protection sheath of the milling machine head;

[0016] Figure 2 This is a front view of the protective sheath assembly in the utility model;

[0017] Figure 3 for Figure 2 Sectional view of AA in the middle;

[0018] Figure 4 This is the front view of the front cap of the milling machine head of the utility model;

[0019] Figure 5 for Figure 4 Cross-sectional view of the middle BB;

[0020] Figure 6 It is a schematic diagram of the structure of the milling cutter of the milling machine head;

[0021] Figure 7 This is the front view of the milling cutter of the milling machine head;

[0022] Figure 8 for Figure 7 Cross-sectional view of CC.

[0023] In the figure: 1. Shell assembly; 2. Front cap of milling machine head; 3. Protective sheath assembly; 4. Spindle; 6. Bearing 2; 7. Locking plane; 8. Steel ball embedding groove; 9. Milling cutter; 22. Bearing 1; 31. Push-pull sleeve; 32. Spring; 33. Protective sheath; 34. Locking inner cylinder; 35. Steel ball; 36. Locking nut; 37. Fixing groove. DETAILED DESCRIPTION

[0024] The present invention will be further described below through specific embodiments in conjunction with the accompanying drawings.

[0025] Embodiment 1:

[0026] like Figure 1-5 As shown, a milling machine head milling cutter protective sheath includes a milling head front cap 2, a protective sheath assembly 3, a spindle 4 and a milling cutter 9 installed on the spindle 4, one end of the spindle 4 is installed in the milling head front cap 2 through a bearing 22, a bearing 26 is arranged between the milling cutter 9 and the milling head front cap 2, one end of the milling head front cap 2 is installed in the protective sheath assembly 3, the protective sheath assembly 3 includes a protective sheath 33, one end of the outer side wall of the milling head front cap 2 is connected to the protective sheath 33, the head of the protective sheath 33 is provided with a fixing groove 37, and the head of the milling cutter 9 is arranged in the fixing groove 37.

[0027] In this embodiment, by embedding bearing 1 22 and bearing 2 6 inside the front cap 2 of the milling machine head, additional radial support is given to the milling cutter 9. In addition, the head of the protective sheath 33 can rotate freely 360°, and there is no need to frequently rotate the milling head to adjust the milling direction during craniotomy. Through bearing 1 22 and bearing 2 6, the front cap 2 of the milling machine head provides additional support for the inner hole position of the protective sheath 33; in addition, the head end of the protective sheath 33 is designed with a fixed groove 37 that cooperates with the milling cutter 9, which further increases radial support for the milling cutter 9.

[0028] Embodiment 2:

[0029] A milling machine head milling cutter protective sheath, which is different from Example 1 in that the protective sheath assembly 3 also includes a push-pull sleeve 31 and a locking inner cylinder 34, the milling head front cap 2 is connected to the locking inner cylinder 34, the outer ring of the locking inner cylinder 34 is connected to the push-pull sleeve 31 through a spring 32, and a locking nut 36 is arranged between the end of the locking inner cylinder 34 and the end of the push-pull sleeve 31, and the inner ring of the locking nut 36 is against the protective sheath 33.

[0030] Furthermore, a steel ball embedding groove 8 is provided between the push-pull sleeve 31 and the protective sheath 33 , and a steel ball 35 is installed in the steel ball embedding groove 8 . When the steel ball 35 is stuck in the steel ball embedding groove 8 , the protective sheath 33 is in a locked state.

[0031] Furthermore, the outer ring of the milling head front cap 2 is connected to the inner ring of the locking inner cylinder 34 through threads.

[0032] Furthermore, the bearing 1 22 and the bearing 2 6 are both deep groove ball bearings.

[0033] Embodiment 3:

[0034] like Figure 6-8As shown, a milling machine head milling cutter includes a shell component 1, and the shell component 1 is installed with a milling machine head milling cutter protective sheath as described in Example 1 or 2.

[0035] The working principle of the utility model is:

[0036] 1) Locking the protective sheath 33: The spring 32 lifts the push-pull sleeve 31 upward to the limit position, and the push-pull sleeve 31 squeezes the steel ball 35 into the steel ball embedding groove 8, locking the position relationship between the protective sheath 33 and the front cap 2 of the milling machine head, such as Figure 1 In the state shown, the locking plane 7 is long enough to ensure that the push-pull sleeve 31 can still press the steel ball 35 with the plane when the vibration or accidental touch moves within a distance of ≤1.5mm, and ensure that the steel ball 35 does not fall out of the steel ball embedding groove 8;

[0037] 2) An additional bearing 26 is added to the front end of the milling head front cap 2 to provide additional radial support for the milling cutter 9, and the outer wall of the milling head front cap 2 also provides additional inner wall support for the protective sheath 33 to ensure the stability of the connection of the protective sheath 33, thereby further ensuring the support of the protective sheath 33 for the milling cutter 9;

[0038] 3) A fixing groove 37 is opened at the head end of the protective sheath 33, and the diameter is slightly larger than the thickness of the bladeless core of the milling cutter 9. When the milling cutter 9 is subjected to a large radial force, the bladeless section of the milling cutter 9 will fit into the fixing groove 37 of the protective sheath 33, and the protective sheath 33 provides additional head support for the milling cutter 9.

[0039] When installing the utility model, the threaded connection between the locking inner cylinder 34 and the locking nut 36 is fixed with Loctite 680 thread glue, and then fixed with laser spot welding; after installation, the push-pull sleeve 31 can be pulled back to quickly install the protective sheath 33, and the push-pull sleeve 31 is loosened, and the protective sheath 33 is locked and cannot be pulled out; after assembly, no scratches are visually observed on the surface, and after assembly, a soft brush is used to clean it under running water, and after cleaning, an air gun is used to dry it, and a small amount of lubricant is injected from the rear end hole before packaging.

Claims

1. A milling cutter protective sheath for a milling machine head, comprising a milling machine head front cap (2), a protective sheath assembly (3), a spindle (4) and a milling cutter (9) mounted on the spindle (4), characterized in that: One end of the spindle (4) is installed in the front cap (2) of the milling machine head through a bearing 1 (22); a bearing 2 (6) is arranged between the milling cutter (9) and the front cap (2) of the milling machine head; one end of the front cap (2) of the milling machine head is installed in a protective sheath assembly (3); the protective sheath assembly (3) comprises a protective sheath (33); a fixing groove (37) is arranged at the head of the protective sheath (33); and the head of the milling cutter (9) is arranged in the fixing groove (37).

2. The milling cutter protective sheath for a milling machine head according to claim 1, characterized in that: The protective sheath assembly (3) also includes a push-pull sleeve (31) and a locking inner cylinder (34); the front cap (2) of the milling machine head is connected to the locking inner cylinder (34); the outer ring of the locking inner cylinder (34) is connected to the push-pull sleeve (31) via a spring (32); a locking nut (36) is provided between the end of the locking inner cylinder (34) and the end of the push-pull sleeve (31), and the inner ring of the locking nut (36) abuts against the protective sheath (33).

3. The milling cutter protective sheath for a milling machine head according to claim 2, characterized in that: A steel ball embedding groove (8) is provided between the push-pull sleeve (31) and the protective sheath (33), and a steel ball (35) is installed in the steel ball embedding groove (8).

4. The milling cutter protective sheath for a milling machine head according to claim 2, characterized in that: The outer ring of the milling machine head front cap (2) is connected to the inner ring of the locking inner cylinder (34) through threads.

5. The milling cutter protective sheath for a milling machine head according to any one of claims 1 to 4, characterized in that: The bearing 1 (22) and the bearing 2 (6) are both deep groove ball bearings.

6. A milling cutter head of a milling machine, comprising a housing assembly (1), characterized in that: The housing component (1) is provided with a milling machine head milling cutter protective sheath as described in any one of claims 1 to 4.

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