Centering rod

Abstract

The utility model relates to the technical field of machining, in particular to a centering rod which comprises a clamping shaft and a swing shaft, connecting channels are formed in the middle of the interior of the clamping shaft and the middle of the interior of the swing shaft, the connecting channels on the two sides are communicated in a contact mode, and a set of stepped safety pins are detachably positioned and installed in the connecting channels in the swing shaft. The step end of the step type safety pin extends into the clamping shaft inner side connecting channel, a step hole opening is formed in one end of the clamping shaft inner side connecting channel, the step type safety pin is movably connected to the step hole opening in a limiting mode, a set of tension springs are arranged in the step type safety pin, and the ends, facing the swing shaft, of the tension springs are fixed to the inner bottom of the step type safety pin. And the other end is fixed at the top in the connecting channel on the inner side of the clamping shaft. When the centering rod runs, the swing shaft can be always in a limited safety range, the situation that the swing shaft is separated from the clamping shaft and thrown out due to the too high rotating speed to cause product damage and personal safety is avoided, and the centering rod is higher in safety and stability, convenient to disassemble and simple in structure.

Description

Technical Field

[0001] The utility model relates to the technical field of machining, in particular to a center finder. Background Art

[0002] A center finder is a tool used in machining, mainly used to determine the center position of a workpiece. It is very useful in processes such as numerical control machining, milling, and turning. It can help operators accurately find the center point of the workpiece, thereby ensuring the accuracy and consistency of machining.

[0003] The existing patent authorization number is: CN219053797U, which discloses a center finder, including a clamping shaft and a swing shaft. Connecting channels are provided on both the clamping shaft and the swing shaft. A first elastic member is arranged in the connecting channel, and one end of the clamping shaft and the swing shaft is tightly attached to form a straight rod by relying on the pulling force of the first elastic member; a safety rope is arranged in the connecting channel. One end of the safety rope is fixedly connected to the clamping shaft, and the other end of the safety rope is fixedly connected to the swing shaft. This center finder can prevent the swing shaft from breaking away from the clamping shaft and hurting the operator. After analyzing this center finder, it can be found that it uses the setting of the safety rope to prevent the clamping shaft and the swing shaft from separating too much and causing danger. However, due to the flexible performance of the safety rope, although it can reduce the separation distance between the clamping shaft and the swing shaft, during actual use, when the swing shaft is subjected to a large centrifugal force, it tilts relative to the clamping shaft, which is likely to cause damage to the swing shaft itself, and the stability is insufficient, which is not conducive to accurately positioning the center of the workpiece;

[0004] Therefore, in view of the above problems, this technical solution proposes a center finder. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a center finder to solve the problems raised in the above background art.

[0006] To achieve the above object, the present utility model provides the following technical solutions: A centering bar includes a clamping shaft and a swinging shaft. The clamping shaft is installed on a cutting chuck or a drilling chuck. The swinging shaft is used to approach the workpiece to be measured for detection. Connecting channels are provided in the middle parts of both the clamping shaft and the swinging shaft, and the two connecting channels are in contact and communicated. A set of stepped safety pins are detachably and positionally installed in the connecting channel inside the swinging shaft. The stepped end of the stepped safety pin extends into the connecting channel inside the clamping shaft. A stepped hole is provided at one end of the connecting channel inside the clamping shaft. The stepped safety pin is connected in a limited movement manner at the stepped hole, used to keep the stepped end of the stepped safety pin moving inside it, and at the same time prevent the stepped end of the stepped safety pin from detaching, thereby controlling that the swinging shaft can only operate relative to the clamping shaft within a limited safety range, preventing the swinging shaft from tilting greatly relative to the clamping shaft when subjected to a large centrifugal force. A set of tension springs are provided inside the stepped safety pin. The end of the tension spring facing the swinging shaft is fixed at the inner bottom of the stepped safety pin, and the other end is fixed at the inner top of the connecting channel inside the clamping shaft, that is, using the contraction elasticity of the tension spring to maintain the automatic contact between the clamping shaft and the swinging shaft, and to control the centering detection of the swinging shaft on the workpiece.

[0007] Compared with the prior art, the beneficial effects of the present utility model are: By providing a set of stepped safety pins inside the connecting channel between the clamping shaft and the swinging shaft, and then connecting a set of tension springs inside the stepped safety pin, using one end of the stepped safety pin to move within a certain range inside the clamping shaft in cooperation with the tension spring, preventing the swinging shaft from swinging too large an angle relative to the clamping shaft, controlling the swinging shaft to always be within the defined safety range, and avoiding the swinging shaft from detaching from the clamping shaft and flying out due to too high a rotational speed, resulting in damage to the product and personal safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic structural diagram of a centering bar.

[0009] Figure 2 It is a schematic structural diagram of the stepped safety pin in a centering bar.

[0010] Figure 3 It is a schematic structural diagram of the pull cap in a centering bar.

[0011] Figure 4 It is a schematic structural diagram of the tension spring in a centering bar.

[0012] Figure 5 It is a schematic structural diagram of the cylindrical pin in a centering bar.

[0013] Wherein: clamping shaft 10, swinging shaft 11, pull cap 12, tension spring 13, stepped safety pin 14, cylindrical pin 15, connecting hook 16, pin hole 17, connecting channel 18. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments may be combined with each other.

[0015] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0016] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood through specific circumstances.

[0017] The present utility model will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0018] Please refer to Figures 1 - 5, A centering bar, comprising a clamping shaft 10 and a swing shaft 11. The clamping shaft 10 is installed on a cutting chuck or a drilling chuck. The swing shaft 11 is used to approach the workpiece to be measured for detection. Connecting channels 18 are provided in the middle of both the clamping shaft 10 and the swing shaft 11. The two side connecting channels 18 are in contact and communicate with each other. A set of stepped safety pins 14 are detachably and positionedly installed in the connecting channel 18 inside the swing shaft 11. The stepped end of the stepped safety pin 14 extends into the connecting channel 18 inside the clamping shaft 10. A stepped hole opening is provided at one end inside the connecting channel 18 of the clamping shaft 10. The stepped safety pin 14 is limitably and movably connected at the stepped hole opening, used to keep the stepped end of the stepped safety pin 14 moving inside it, and at the same time prevent the stepped end of the stepped safety pin 14 from detaching. Thus, it is controlled that the swing shaft 11 can only relatively operate within a limited (radial and axial) safety range relative to the clamping shaft 10, preventing the swing shaft 11 from tilting greatly relative to the clamping shaft 10 when subjected to a large centrifugal force. A set of tension springs 13 are provided inside the stepped safety pin 14. The end of the tension spring 13 facing the swing shaft 11 is fixed at the inner bottom of the stepped safety pin 14, and the other end is fixed at the inner top of the connecting channel 18 inside the clamping shaft 10. That is, by using the contraction elasticity of the tension spring 13, the automatic contact between the clamping shaft 10 and the swing shaft 11 is maintained, and the swing shaft 11 is controlled to perform centering detection on the workpiece.

[0019] In the embodiment of the present invention, the inside of the stepped safety pin 14 is set as a hollow structure. Connecting rings and connecting hooks 16 are respectively provided at both ends of the tension spring 13. The connecting hook 16 is detachably connected to the inner end of the connecting channel 18 inside the clamping shaft 10. The connecting ring is detachably positioned at the inner end of the stepped safety pin 14. A radially penetrating pin hole 17 is provided at the other end of the stepped safety pin 14 relative to its stepped end. A cylindrical pin 15 is inserted in the pin hole 17. A radially penetrating hole is provided at a position near the inner bottom of the connecting channel 18 inside the swing shaft 11 on the swing shaft 11. The cylindrical pin 15 radially penetrates through the pin hole 17, the connecting ring, and the radially penetrating hole. When the cylindrical pin 15 passes through the inside of the pin hole 17, it passes through the connecting ring, thereby fixing one end of the tension spring 13 inside the stepped safety pin 14. That is, by controlling the radial insertion of the cylindrical pin 15 on the swing shaft 11, the positioning of the tension spring 13 and the stepped safety pin 14 on the connecting channel 18 inside the swing shaft 11 is controlled at the same time.

[0020] In an example of the present invention, a set of pull caps 12 are detachably installed at the small-diameter end of the clamping shaft 10. The pull caps 12 are provided with a stepped structure. A connecting hole is provided at the inner end of the pull cap 12. The connecting hole is hooked with the connecting hook 16, thereby controlling the detachable connection between the end of the tension spring 13 and the inside of the clamping shaft 10;

[0021] Specifically, various connection methods such as plug connection and threaded connection can be adopted between the pull cap 12 and the clamping shaft 10, and the specific selection is determined according to the actual situation.

[0022] The above has described in detail the preferred embodiments of the present patent. However, the present patent is not limited to the above embodiments, and various changes can be made without departing from the gist of the present patent within the scope of knowledge possessed by those of ordinary skill in the art.

Claims

1. A centering bar, comprising a clamping shaft (10) and a swing shaft (11), the clamping shaft (10) being installed on a cutting chuck or a drilling chuck, characterized in that, A connecting channel (18) is provided in the middle of both the clamping shaft (10) and the swing shaft (11). The two connecting channels (18) are in contact connection. A set of stepped safety pins (14) are detachably and positioned in the connecting channel (18) inside the swing shaft (11). The stepped end of the stepped safety pin (14) extends into the connecting channel (18) inside the clamping shaft (10). A stepped orifice is provided at one end inside the connecting channel (18) of the clamping shaft (10). The stepped safety pin (14) is connected in a limited movement manner at the stepped orifice. A set of tension springs (13) are provided inside the stepped safety pin (14). The end of the tension spring (13) facing the swing shaft (11) is fixed to the inner bottom of the stepped safety pin (14), and the other end is fixed to the inner top of the connecting channel (18) inside the clamping shaft (10).

2. The centering bar according to claim 1, characterized in that, The inside of the stepped safety pin (14) is provided with a hollow structure. Connecting rings and connecting hooks (16) are respectively provided at both ends of the tension spring (13). The connecting hook (16) is detachably connected to the inner end of the connecting channel (18) inside the clamping shaft (10), and the connecting ring is detachably positioned at the inner end of the stepped safety pin (14).

3. The centering bar according to claim 2, wherein A radially penetrating pin hole (17) is provided at the other end of the stepped safety pin (14) opposite to its stepped end. A cylindrical pin (15) is inserted into the pin hole (17). A radially penetrating hole is provided at a position near the inner bottom of the inner connecting channel (18) of the swing shaft (11). The cylindrical pin (15) radially penetrates through the pin hole (17), the connecting ring, and the radially penetrating hole.

4. The centering bar according to claim 3, characterized in that, A set of pull caps (12) are detachably installed at the top end of the clamping shaft (10). The pull cap (12) is provided with a stepped structure. A connecting hole is provided at the inner end of the pull cap (12), and the connecting hole is hooked to the connecting hook (16).

5. A centering bar according to claim 4, characterized in that, The pull cap (12) and the clamping shaft (10) are connected by insertion or threading.

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