A saw blade connecting rod

Abstract

The utility model discloses a saw blade connecting rod, including the rod body, the end of rod body is equipped with the limit lug, the limit lug is polygonal shape, and, the shape of limit lug is compatible with the slot on saw blade, and the limit lug is used for with the slot on saw blade and is matched with the card, and the limit lug inserts the inside of slot, and locking screw is connected with the rod body, makes saw blade fastening in the end of rod body, and the rigid interference fit of limit lug and slot forms the close shape face occlusion, thereby guaranteeing the connection steady of saw blade and rod body, and the axial tension effect of cooperation locking screw forms the double anti -loose structure of mechanical shape face restriction and thread pretightening force, therefore, even under the working condition of high -speed cutting, the geometric interlock of limit lug and slot can directly limit the relative rotation of saw blade and rod body through shape face restriction, effectively prevents saw blade and flies.

Description

Technical Field

[0001] This utility model relates to the field of cutting tool technology, specifically a saw blade connecting rod. Background Technology

[0002] In the fields of power tools, CNC machining equipment and manual cutting tools, the saw blade is the core cutting component, and the way it is fixed to the shaft directly affects the tool's safety, machining accuracy and service life.

[0003] Currently, the mainstream saw blade connection structure on the market generally adopts a single threaded locking scheme. That is, the locking screw is directly passed through the center hole of the saw blade and screwed into the threaded hole at the end of the rod. The axial tension of the screw is used to press the saw blade against the end face of the rod. However, in this structure, the anti-rotation of the saw blade and the rod depends entirely on the friction of the screw thread and the static friction between the end face of the saw blade and the end face of the rod. Under high-speed cutting conditions, the cutting resistance can easily cause the screw to loosen, causing relative rotation between the saw blade and the rod. The saw blade may be thrown out due to centrifugal force. In addition, in the traditional structure, the radial and axial positioning of the saw blade is only achieved by screw clamping, which lacks rigid geometric constraints. During assembly, manual operation can easily cause the center hole of the saw blade to deviate from the axis of the rod, which in turn causes the cutting surface to tilt. Utility Model Content

[0004] In order to overcome the shortcomings of existing technical solutions, this utility model provides a saw blade connecting rod, which can effectively solve the technical problems mentioned in the background art.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a saw blade connecting rod, including a rod body, the end of the rod body is provided with a limiting protrusion, the limiting protrusion is polygonal, and the shape of the limiting protrusion is adapted to the slot on the saw blade, the limiting protrusion is used to engage with the slot on the saw blade.

[0006] Furthermore, one end of the rod is a motor connection end, and the limiting protrusion is fixedly located at the end of the rod away from the motor connection end.

[0007] Furthermore, the limiting protrusion has a through hole in the middle, and the end of the rod has a threaded groove coaxial with the through hole.

[0008] Furthermore, the limiting protrusion is hexagonal in shape.

[0009] Furthermore, the limiting protrusion and the rod body are an integral structure.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] By setting a limiting protrusion at the end of the rod, the rigid interference fit between the limiting protrusion and the slot forms a tight surface engagement, thereby ensuring a stable connection between the saw blade and the rod. Combined with the axial tension of the locking screw, a dual anti-loosening structure of mechanical surface constraint and thread preload is formed. Therefore, even under high-speed cutting conditions, the geometric interlocking of the limiting protrusion and the slot can directly limit the relative rotation between the saw blade and the rod through surface constraint, effectively preventing the saw blade from flying off. Attached Figure Description

[0012] Figure 1 This is a 3D view of the saw blade connecting rod;

[0013] Figure 2 An assembly diagram of the rod body, saw blade, and locking screws;

[0014] Figure 3 This is an exploded view of the structure of the rod, saw blade, and locking screw.

[0015] Numbering on the map:

[0016] 1. Locking screw; 2. Saw blade; 3. Motor connection end; 4. Rod body; 5. Threaded groove; 6. Limiting protrusion; 7. Slot. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] like Figure 1 As shown, the present invention provides a saw blade connecting rod, including a rod body 4. The end of the rod body 4 is provided with a limiting protrusion 6, which is polygonal in shape. One end of the rod body 4 is a motor connection end 3. The limiting protrusion 6 is fixedly disposed at the end of the rod body 4 away from the motor connection end 3. In this embodiment, the limiting protrusion 6 and the rod body 4 are an integral structure. The shape of the limiting protrusion 6 is hexagonal. The shape of the limiting protrusion 6 is adapted to the slot 7 on the saw blade 2. The limiting protrusion 6 is used to engage with the slot 7 on the saw blade 2. This engagement mainly plays the role of initial positioning and limiting axial movement, ensuring that the connecting rod and the saw blade 2 can be quickly and accurately aligned during installation, and preventing the saw blade 2 from axially moving during operation.

[0019] Since the snap-fit ​​connection alone is insufficient to meet the connection stability requirements of saw blade 2 under high-intensity working conditions, locking screws 1 are also needed to secure the saw blade 2 and the connecting rod together. This enhances the shear resistance and loosening resistance at the connection point, thereby achieving a long-term, stable connection between the connecting rod and the saw blade 2. Figure 2-3 As shown, the limiting protrusion 6 has a through hole in the middle, and the end of the rod body 4 has a threaded groove 5 coaxial with the through hole. The threaded groove 5 is used to connect with the locking screw 1 by thread.

[0020] The installation steps are as follows: The limiting protrusion 6 of the rod body 4 is inserted into the slot 7 of the saw blade 2, and the limiting protrusion 6 and the slot 7 are interference-fitted so that the bottom surface of the saw blade 2 is close to the end face of the rod body 4. Then, the locking screw 1 passes through the through hole and is threaded to the rod body 4, so that the saw blade 2 is fastened to the end of the rod body 4, thereby completing the connection between the saw blade 2 and the rod body 4.

[0021] The anti-loosening principle is as follows: the rigid interference fit between the limiting protrusion 6 and the slot 7 forms a tight surface engagement, thereby ensuring the stable connection between the saw blade 2 and the rod body 4. Combined with the axial tension of the locking screw 1, a dual anti-loosening structure of mechanical surface constraint and thread preload is formed. Therefore, even under high-speed cutting conditions, the geometric interlocking of the limiting protrusion 6 and the slot 7 can directly restrict the relative rotation between the saw blade 2 and the rod body 4 through surface constraint, effectively preventing the saw blade 2 from flying off.

[0022] It should be noted that the shape of the slot 7 and the limiting protrusion 6 is not limited to hexagons. They can be any regular polygon, non-regular polygon, or irregular polygon, such as triangle, quadrilateral, pentagon, octagon, dodecagon, trapezoid, L-shape, star, etc.

[0023] Compared to traditional technologies:

[0024] By setting a limiting protrusion 6 at the end of the rod 4, the rigid interference fit between the limiting protrusion 6 and the slot 7 forms a tight surface engagement, thereby ensuring a stable connection between the saw blade 2 and the rod 4. Combined with the axial tensioning effect of the locking screw 1, a dual anti-loosening structure of mechanical surface constraint and thread preload is formed. Therefore, even under high-speed cutting conditions, the geometric interlocking of the limiting protrusion 6 and the slot 7 can directly restrict the relative rotation of the saw blade 2 and the rod 4 through surface constraint, effectively preventing the saw blade 2 from flying off.

[0025] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A saw blade connecting rod, characterized in that, The saw includes a rod body, the end of which is provided with a limiting protrusion. The limiting protrusion is polygonal in shape and its shape is adapted to the slot on the saw blade. The limiting protrusion is used to engage with the slot on the saw blade.

2. A saw blade connecting rod according to claim 1, characterized in that, One end of the rod is the motor connection end, and the limiting protrusion is fixedly installed at the end of the rod away from the motor connection end.

3. A saw blade connecting rod according to claim 1, characterized in that, The limiting protrusion has a through hole in the middle, and the end of the rod has a threaded groove coaxial with the through hole.

4. A saw blade connecting rod according to claim 1, characterized in that, The limiting protrusion is hexagonal in shape.

5. A saw blade connecting rod according to any one of claims 1-4, characterized in that, The limiting protrusion and the rod are an integral structure.

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