Thin-tube-shaped sand blasting head for medical instrument

Abstract

The utility model relates to a slender tubular sandblasting head for medical equipment, which comprises a tubular body and a nozzle arranged at one end of the tubular body, the outer diameter of the nozzle is gradually reduced, the side surface of the nozzle is provided with a spraying hole extending to the tubular body, and the tangent plane of the spraying hole is a cambered surface. During sand blasting, the lateral pressure when sand grains are sprayed out of the nozzle can be increased, it is guaranteed that the track of the sand grains is deviated towards the side wall of an inner hole when the sand grains are sprayed out, sand blasting work of the inner hole can be completed at a time, long-time and multi-layer repeated sand blasting operation is not needed, and therefore the sand blasting efficiency of the inner hole is improved, the machining cost and the machining difficulty are reduced, and the production efficiency is improved. And the sand blasting quality of the inner hole is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of sandblasting processing of medical devices, and particularly relates to a fine tubular sandblasting head for medical devices. Background Art

[0002] Internal hole sandblasting technology is widely used in the field of medical device processing. To ensure the effectiveness and stability of internal hole sandblasting, a sandblasting head is often required to perform high-speed sandblasting on the inner wall of the hole. For the sandblasting operation of small-diameter deep long holes on medical devices, a fine tubular sandblasting head is generally selected. As Figure 1 shown, this kind of sandblasting head has a straight tube structure, and the spray holes are located at the positive end of the sandblasting head, that is, the spray holes are coaxially arranged with the inner hole of the tubular body of the sandblasting head. When this kind of sandblasting head is used for sandblasting small-diameter deep long holes, only the direct spraying method can be adopted, and it is necessary to perform repeated sandblasting operations on the inner hole for a long time and at multiple levels. Not only is the sandblasting effect limited and the sandblasting quality cannot be guaranteed, but also the sandblasting process is cumbersome and difficult, directly affecting the sandblasting efficiency and increasing the sandblasting cost. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a fine tubular sandblasting head for medical devices to solve the problem of low sandblasting efficiency.

[0004] The fine tubular sandblasting head for medical devices of the utility model is realized as follows:

[0005] A fine tubular sandblasting head for medical devices includes a tubular body and a nozzle provided at one end of the tubular body with an outer diameter gradually decreasing. The side of the nozzle is provided with spray holes extending to the tubular body, and the section of the spray holes is an arc surface.

[0006] Further, the section of the spray holes is an inward concave arc surface.

[0007] Further, the vertical section of the spray holes is an oval hole, and the length of its major axis a is 3.5 - 4.5 times the length of its minor axis b.

[0008] Further, the relationship between the depth h of the arc of the section of the spray holes, the outer radius d of the tubular body, and the outer diameter D of the tubular body is: D > h > d.

[0009] Further, the outer surface of the nozzle is an arc surface.

[0010] Further, an installation sleeve with an outer diameter larger than that of the tubular body is provided at the other end of the tubular body.

[0011] Further, a washer is assembled inside the installation sleeve.

[0012] After adopting the above technical solutions, the beneficial effects of the utility model are as follows:

[0013] The spray holes of the present utility model have a side-opening structure with an arc-shaped cross-section. When sandblasting, the lateral pressure of the sand grains ejected from the nozzle is increased, ensuring that the trajectory of the sand grains deviates towards the inner hole sidewall when ejected. The sandblasting work of the inner hole can be completed at one time, without the need for long-term and multi-level repeated sandblasting operations, thereby improving the sandblasting efficiency of the inner hole, reducing the processing cost and processing difficulty, and ensuring the sandblasting quality of the inner hole. Brief Description of the Drawings

[0014] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0015] Figure 1 is a structural diagram of an existing fine tubular sandblasting head;

[0016] Figure 2 is a structural diagram of a fine tubular sandblasting head for medical devices according to a preferred embodiment of the present utility model;

[0017] Figure 3 is a right view of a fine tubular sandblasting head for medical devices according to a preferred embodiment of the present utility model;

[0018] Figure 4 is a top view of a fine tubular sandblasting head for medical devices according to a preferred embodiment of the present utility model;

[0019] Figure 5 is a front view of a fine tubular sandblasting head for medical devices according to a preferred embodiment of the present utility model;

[0020] In the figure: tubular body 1, nozzle 2, spray hole 3, shaft hole I 4, concave arc surface 5, convex arc surface 6, mounting sleeve 7, washer 8. Detailed Description of the Embodiments

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0022] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0023] As shown Figure 2-5 in the figure, a fine tubular sandblasting head for a medical device includes a tubular body 1 and a nozzle 2 provided at one end of the tubular body 1 with a gradually decreasing outer diameter. A spray hole 3 extending to the tubular body 1 is provided on the side surface of the nozzle 2, and the cross-section of the spray hole 3 is an arc surface.

[0024] An axial hole I 4 is provided inside the sandblasting head. The sand grains pass through the axial hole I 4 and then are ejected outward from the spray hole 3 at the nozzle 2 to realize sandblasting on the side wall of the inner hole.

[0025] The cross-section of the spray hole 3 is an inwardly concave arc surface 5.

[0026] The spray hole 3 with an arc-shaped cross-section can increase the lateral pressure when the sand grains are ejected and improve the sandblasting efficiency.

[0027] In order to make the trajectory of the sand grains shift inward to the side wall of the inner hole when the sand grains are ejected, the spray hole 3 adopts a side-opening method. Specifically, the vertical cross-section of the spray hole 3 is an oval hole, and the length of its major axis a is 3.5 - 4.5 times the length of its minor axis b.

[0028] From the perspective of the side where the spray hole 3 is located, the spray hole 3 is an oval hole, that is, the vertical cross-section of the spray hole 3.

[0029] In order to ensure the sandblasting efficiency, the relationship between the depth h of the arc of the cross-section of the spray hole 3, the outer radius d of the tubular body 1, and the outer diameter D of the tubular body 1 is: D > h > d.

[0030] In order to place the nozzle 2 end into the inner hole during the sandblasting process to improve the convenience of sandblasting, the outer surface of the nozzle 2 is an arc surface.

[0031] Specifically, the arc surface of the outer surface of the nozzle 2 is a convex arc surface 6 with a maximum outer diameter not greater than the outer diameter of the tubular body 1, which has a certain guiding effect when the nozzle 2 is inserted into the inner hole.

[0032] In order to facilitate connection with the sandblasting equipment, an installation sleeve 7 with an outer diameter larger than that of the tubular body 1 is provided at the other end of the tubular body 1.

[0033] The axial hole II of the installation sleeve 7 is communicated with and coaxially arranged with the axial hole I 4 of the tubular body 1.

[0034] The installation sleeve 7 can be assembled on the sandblasting pipe of the sandblasting equipment, so that the sand grains in the sandblasting equipment can be sent into the sandblasting head through the sandblasting pipe, and then the inner wall of the inner hole can be sandblasted.

[0035] A washer 8 is assembled inside the installation sleeve 7.

[0036] When the installation sleeve 7 is assembled into the sandblasting pipe, the washer 8 can play a protective role to prevent the problem of pressure relief and increase the output pressure during inner hole sandblasting.

[0037] For the sandblasting head of the present utility model, when the gas pressure is relatively high and flows through the axial hole Ⅰ 4 of the tubular body 1, due to the turbulent characteristics of the flow and the fact that the gas flow is affected by inertial force, the side wall of the axial hole Ⅰ 4 of the tubular body 1 will play a supporting role. When a perforation (i.e., the spray hole 3) appears at the end of the tubular body 1, the side without the perforation is supported while the perforated part has no support, resulting in an increase in the flow velocity and a decrease in the pressure at the perforated part. Thus, the airflow containing sand grains can be blown towards the side wall of the inner hole in a jet shape, realizing the sandblasting operation on the side wall.

[0038] In short, the present utility model realizes the sandblasting work on the side wall of the inner hole through the pressure difference at the nozzle 2, increases the lateral pressure when the sand grains are ejected from the spray hole 3, avoids the poor sandblasting effect on the side wall caused by direct spraying, can complete the sandblasting operation on the inner hole at one time, without the need for long-term and multi-level repeated sandblasting operations, improves the sandblasting efficiency, reduces the processing cost and operation difficulty, ensures the sandblasting quality of the inner hole, and is applicable to the sandblasting operation of small-diameter deep long holes.

[0039] Enlightened by the above ideal embodiments based on the present utility model, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this utility model. The technical scope of this utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A fine tubular sandblasting head for medical devices, characterized in that, It includes a tubular body (1) and a nozzle (2) provided at one end of the tubular body (1) with a gradually decreasing outer diameter. A spray hole (3) extending to the tubular body (1) is provided on the side of the nozzle (2), and the section of the spray hole (3) is an arc surface.

2. The fine tubular sandblasting head for medical devices according to claim 1, characterized in that, The section of the spray hole (3) is an inwardly concave arc surface (5).

3. The fine tubular sandblasting head for medical devices according to claim 1, characterized in that, The vertical section of the spray hole (3) is an elliptical hole, and the length of its major axis a is 3.5 - 4.5 times the length of its minor axis b.

4. The fine tubular sandblasting head for medical devices according to claim 1, characterized in that, The relationship between the depth h of the radian of the section of the spray hole (3), the outer radius d of the tubular body (1), and the outer diameter D of the tubular body (1) is: D > h > d.

5. The fine tubular sandblasting head for medical devices according to claim 1, characterized in that, The outer surface of the nozzle (2) is an arc surface.

6. The fine tubular sandblasting head for medical devices according to claim 1, characterized in that, An installation sleeve (7) with an outer diameter larger than that of the tubular body (1) is provided at the other end of the tubular body (1).

7. The fine tubular sandblasting head for medical devices according to claim 6, characterized in that, A washer (8) is assembled inside the installation sleeve (7).

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