A special extension rod for tap

Abstract

The application belongs to the technical field of taps, and discloses a special extension rod for taps, which comprises a lengthened sleeve, one end of the lengthened sleeve is provided with a connecting head, a square groove is formed in the connecting head away from the one end of the lengthened sleeve, a clamping pipe is protrusively arranged on the end face of the connecting head away from the one end of the lengthened sleeve, the inner diameter of the clamping pipe is greater than the maximum diagonal length of the square groove, a plurality of notches are formed on the pipe wall of the clamping pipe along the axial direction of the pipe wall, an external thread is arranged on the outer wall of the clamping pipe and is screw-connected with a locking nut, the square groove is used for cooperating with a square block on the tap, and the other end of the lengthened sleeve is used for being connected with a tapping device. The application realizes preliminary positioning and connection through cooperation of the square groove and the square block on the tap, and then the tap is firmly clamped through cooperation of the locking nut and the clamping pipe, so that loosening of the tap in the tapping process is effectively prevented, the machining precision and efficiency are ensured, and the service life of the tap is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of tap technology, and in particular to a tap-specific extension rod. Background Technology

[0002] A tap is a commonly used cutting tool for machining internal threads, widely used in many fields such as machinery manufacturing, automotive industry, and aerospace. With the increasing demand for machining complex structures and deep-hole threads in industrial production, the length of taps can no longer meet the actual production needs, thus requiring the use of extension rods to increase the tap's length.

[0003] Chinese utility model patent CN 216912388 U discloses a tap extension sleeve, which includes a sleeve body. The two ends of the sleeve body are respectively provided with a snap-fit ​​groove and a mating protrusion. The snap-fit ​​groove cooperates with the snap-fit ​​protrusion provided on the tap, and the mating protrusion cooperates with the mating groove provided on the wrench. This allows the wrench to drive the tap to process internal threads through the sleeve body. The sleeve body indirectly extends the length of the tap, solving the problem of being unable to process due to the limited length of the tap, and improving the adaptability of the tap.

[0004] Regarding the aforementioned technologies, the inventors believe that the following defects exist: the above-mentioned solutions use a snap-fit ​​groove on the sleeve body to cooperate with a snap-fit ​​protrusion on the tap to achieve the connection between the sleeve body and the tap through a snap-fit ​​method, which makes it easy for the tap and the sleeve body to detach due to external force during use, thereby affecting the use. Utility Model Content

[0005] To solve the above problems, this utility model provides a tap extension rod.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a tap extension rod, comprising an extended sleeve, a connector at one end of the extended sleeve, a square groove formed inward at the end of the connector away from the extended sleeve, a clamping tube protruding from the end face of the connector away from the extended sleeve, the inner diameter of the clamping tube being greater than the maximum diagonal length of the square groove, several notches formed along the axial direction on the wall of the clamping tube, an external thread provided on the outer wall of the clamping tube and a locking nut screwed thereon, the square groove being used to mate with a square block on the tap, and the other end of the extended sleeve being used to connect to a tapping device.

[0007] By adopting the above technical solution, an extended sleeve, a square groove, a clamping tube, a notch, and a locking nut are incorporated. The square groove engages with the square block on the tap to restrict the relative rotation of the tap, achieving initial positioning and connection. Then, the locking nut, in conjunction with the clamping tube, causes the tube wall to move inward, clamping the shank of the tap. This securely clamps the tap, effectively preventing it from loosening during tapping, ensuring machining accuracy and efficiency, and preventing the tap from falling off during operation, thus extending its service life. When the tap needs to be removed, simply loosen the locking nut; the process is convenient.

[0008] Furthermore, the clamping tube has an outer conical surface on its outer wall at the end away from the connector, and the locking nut has an inner conical sleeve at the end away from the connector that mates with the outer conical surface.

[0009] By adopting the above technical solution, an outer conical surface and an inner conical sleeve are set so that when the locking nut is tightened, the pipe wall of the clamping tube can be driven to move inward under the action of the two inclined surfaces.

[0010] Furthermore, the number of notches on the wall of the clamping tube is 4-8.

[0011] By adopting the above technical solution and setting 4-8 notches, the pipe wall can be moved in and out while ensuring the strength of the pipe wall, thereby ensuring the clamping force on the tap.

[0012] Furthermore, a round rod is coaxially provided at the end of the extended sleeve away from the connector, and a square connecting block is provided at the end of the round rod away from the extended sleeve.

[0013] By adopting the above technical solution, round rods and square connecting blocks are set to facilitate connection with tapping equipment.

[0014] Furthermore, the outer wall of the extended sleeve and the locking nut is provided with a grid-like pattern.

[0015] By adopting the above technical solution and setting a grid-like texture, a non-slip function is achieved, making it easier for manual tightening of the nut.

[0016] In summary, this utility model has the following beneficial effects: By providing an extended sleeve, a square groove, a clamping tube, a notch, and a locking nut, the square groove, in conjunction with the square block on the tap, restricts the relative rotation of the tap, achieving initial positioning and connection. Furthermore, the locking nut, in conjunction with the clamping tube, causes the tube wall to move inward, clamping the shank of the tap. This securely clamps the tap, effectively preventing it from loosening during tapping, ensuring processing accuracy and efficiency, and preventing the tap from falling off during operation, thus extending its service life. When the tap needs to be removed, simply loosen the locking nut; the clamping is convenient. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model; Figure 2 This is a cross-sectional structural schematic diagram of an embodiment of the present utility model; Figure 3 This is a schematic diagram of the connector structure according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the locking nut in an embodiment of this utility model.

[0018] In the diagram: 10. Extended sleeve; 11. Round rod; 12. Square connecting block; 20. Connector; 21. Square groove; 22. Clamping tube; 23. Notch; 24. Outer conical surface; 30. Locking nut; 31. Inner conical sleeve. Detailed Implementation

[0019] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0020] like Figure 1-4 As shown in the illustration, this application discloses a tap extension rod, including an extended sleeve, a connector, a round rod, and a square connecting block. The extended sleeve is generally circular and forms the main body of the extension rod. The round rod is located at the end of the extended sleeve furthest from the connector, and is coaxial with the extended sleeve, used to ensure the coaxiality of the tap and the extension rod. The square connecting block is located at the end of the round rod furthest from the extended sleeve and connects to the tapping equipment, used to transmit the torque of the tap during the tapping process. The connector is located at the end of the extended sleeve furthest from the round rod and is used to connect the tap.

[0021] Specifically, a square groove 21 is provided inward at the end of the connector 20 away from the extension sleeve 10. The inner contour of the square groove 21 is consistent with the outer contour of the square block on the tap. It is used to cooperate with the square block on the tap to realize the initial positioning and connection of the tap and the extension rod, and to transmit the torque of the tap during the tapping process to prevent the screw from rotating relative to the extension rod.

[0022] A clamping tube 22 protrudes from the end face of the connector 20 away from the extension sleeve 10. The inner diameter of the clamping tube 22 is larger than the maximum diagonal length of the square groove 21, ensuring that the clamping tube 22 does not affect the fit between the square block on the tap and the square groove 21. Several notches 23 are formed along the axial direction on the wall of the clamping tube 22. An external thread is provided on the outer wall of the clamping tube 22, and a locking nut 30 is screwed onto it. An outer conical surface 24 is provided on the outer wall of the clamping tube 22 at the other end of the extension sleeve 10, away from the connector 20. An inner conical sleeve 31, which mates with the outer conical surface 24, is provided at the end of the locking nut 30 away from the connector 20. Through the mating structure of the outer conical surface 24 and the inner conical sleeve 31, when the locking nut 30 is tightened, a uniform contraction force is generated in the wall of the clamping tube 22, which is divided by the notches 23, further enhancing the clamping effect on the tap and improving the stability of the connection. Preferably, the number of notches 23 on the wall of the clamping tube 22 is 4-8. A reasonable number of notches 23 ensures that the clamping tube 22 has good shrinkage and deformation capacity when subjected to the pressure of the locking nut 30, while also ensuring the structural strength of the clamping tube 22 and preventing damage during clamping.

[0023] A further feature is the addition of a grid-like texture (not shown in the figure) on the outer walls of the extended sleeve 10 and the locking nut 30. Specifically, the outer walls of the extended sleeve 10 and the locking nut 30 can be knurled to produce the grid-like texture. The grid-like texture increases the friction between the hand and the extended sleeve 10 and the locking nut 30, allowing operators to grip them better when installing and removing the extension rod and tightening the locking nut 30, thus improving operational convenience and safety.

[0024] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A tap extension rod, characterized in that: The device includes an extended sleeve (10), one end of which is provided with a connector (20). The connector (20) has a square groove (21) extending inward from the end away from the extended sleeve (10). A clamping tube (22) is protruding from the end face of the connector (20) away from the extended sleeve (10). The inner diameter of the clamping tube (22) is greater than the maximum diagonal length of the square groove (21). Several notches (23) are provided on the wall of the clamping tube (22) along its axial direction. The outer wall of the clamping tube (22) is provided with an external thread and a locking nut (30) is screwed on it. The square groove (21) is used to cooperate with the square block on the tap. The other end of the extended sleeve (10) is used to connect to the tapping equipment.

2. The tap extension rod according to claim 1, characterized in that: The clamping tube (22) has an outer conical surface (24) on the outer wall of the end away from the connector (20), and the locking nut (30) has an inner conical sleeve (31) that mates with the outer conical surface (24) at the end away from the connector (20).

3. The tap extension rod according to claim 1, characterized in that: The number of notches (23) on the wall of the clamping tube (22) is 4-8.

4. The tap extension rod according to claim 1, characterized in that: The extended sleeve (10) is coaxially provided with a round rod (11) at one end away from the connector (20), and a square connecting block (12) is provided at the other end of the round rod (11) away from the extended sleeve (10).

5. The tap extension rod according to claim 1, characterized in that: The outer walls of the extended sleeve (10) and the locking nut (30) are provided with a grid pattern.

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