Clamping device for stopwatch calibration

Abstract

The invention discloses a clamping device for stopwatch calibration, and belongs to the technical field of metering calibration auxiliary devices, the clamping device comprises a base, a clamping assembly used for clamping and fixing a stopwatch and a striking mechanism installed on the base, the base is provided with a rotary table which is rotatably arranged, the clamping assembly is installed on the rotary table, and the striking mechanism is installed on the rotary table. The clamping assembly comprises a plurality of clamping pieces arranged around the rotating axis of the rotary table, and the clamping pieces are installed on the rotary table in the mode that the distance between the clamping pieces and the rotating axis of the rotary table can be adjusted. The clamping device for stopwatch calibration further comprises a clamping control assembly used for driving the multiple clamping pieces to synchronously act so as to be close to and away from the rotating axis of the rotary table at the same time, and an angle adjusting assembly used for adjusting the rotating angle of the rotary table. The clamping device for stopwatch calibration has the advantages of reducing tedious manual operation, improving calibration efficiency and the like.

Description

Technical Field

[0001] This invention relates to the field of metrological calibration auxiliary devices, specifically to a clamping device for stopwatch calibration. Background Technology

[0002] In stopwatch calibration, the calibration is usually carried out in accordance with the "JJF 2195-2025 Stopwatch Calibration Specification". The simplified process is as follows: First, use the clamping device to fix the stopwatch and align the stopwatch start / stop button with the striking mechanism on the clamping device; then, set the standard time interval through the time calibrator (master standard) and drive the striking mechanism to strike the stopwatch start / stop button, thereby completing the calibration of the time parameters.

[0003] Currently, most stopwatch clamping devices use positioning slots or holes in conjunction with limiting bolts to secure the stopwatch. In practice, the bolts and stopwatch positions must be manually adjusted repeatedly to achieve a stable clamping and ensure the start / stop button is accurately aligned with the striking point. This process is cumbersome and inefficient. Furthermore, existing clamping devices can only accommodate stopwatches of specific shapes and only support horizontal calibration, failing to achieve vertical calibration. This does not meet the calibration requirements for vertical calibration of stopwatches, severely limiting the applicability of the clamping devices. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the existing technology and provide a stopwatch calibration clamping device that can reduce tedious manual operations and improve calibration efficiency.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A stopwatch calibration clamping device includes a base, a clamping assembly for clamping and fixing the stopwatch, and a striking mechanism mounted on the base. A rotatable turntable is mounted on the base, and the clamping assembly is mounted on the turntable. The clamping assembly includes a plurality of clamping members arranged around the rotation axis of the turntable. Each clamping member is mounted on the turntable in a manner that allows adjustment of the distance between it and the rotation axis of the turntable. The stopwatch calibration clamping device also includes a clamping control assembly for driving the plurality of clamping members to move synchronously to simultaneously approach and move away from the rotation axis of the turntable, and an angle adjustment assembly for adjusting the rotation angle of the turntable.

[0006] As a further improvement to the above technical solution: The clamping control assembly includes an elastic mechanism for elastically forcing a plurality of clamping members to move closer to the rotation axis of the turntable, and a manual control mechanism for overcoming the elastic effect of the elastic mechanism to drive the plurality of clamping members away from the rotation axis of the turntable and locking the clamping members in a plurality of different positions.

[0007] The clamping control assembly includes a rotating component rotatably mounted on a turntable. Each clamping component is connected to the rotating component via a connecting rod. One end of the connecting rod is hinged to the clamping component, and the other end of the connecting rod is hinged to the rotating component. The hinge axis between the connecting rod and the rotating component is offset from the rotation axis of the rotating component, so that when the rotating component rotates, it drives multiple clamping components to move synchronously via the connecting rod. The elastic mechanism includes a tension spring connected between the clamping component and the rotating component.

[0008] The manual control mechanism includes a disconnectable ratchet mechanism and a release knob rotatably mounted on the base. The release knob is connected to the rotating component via a first linkage mechanism and can drive the rotating component to rotate by turning the release knob. The disconnectable ratchet mechanism includes a release knob, a lever, a ratchet connected to the release knob, and a pawl rotatably mounted on the base. The pawl is connected to a torsion spring that makes the pawl contact the ratchet. When the pawl contacts the ratchet, the release knob can only rotate unidirectionally in the direction that moves the clamping component away from the rotation axis of the turntable. The lever is rotatably mounted on the base and can rotate to disengage the ratchet from the ratchet by rotating the pawl to overcome the torsion spring force. The release knob is connected to the lever.

[0009] The angle adjustment assembly includes a connecting shaft connected to the turntable and an angle adjustment knob rotatably mounted on the base. The angle adjustment knob is connected to the connecting shaft through a second linkage mechanism and can drive the connecting shaft to rotate by turning the angle adjustment knob.

[0010] The rotating component is rotatably mounted on the connecting shaft via a bushing.

[0011] The striking mechanism includes a striking head and a mounting base on the base. The striking head is mounted on the mounting base in a manner that allows adjustment of the distance between it and the rotation axis of the turntable.

[0012] The adjustment mechanism includes a telescopic rod, a rotating roller, and a locking screw. The mounting base has two limiting parts, and the telescopic rod passes through the two limiting parts. The striking head is located at one end of the telescopic rod. The rotating roller is threadedly engaged with the telescopic rod and is located between the two limiting parts. The locking screw is threadedly engaged with one of the limiting parts and can be tightened and loosened by screwing.

[0013] The clamping member has a V-shaped clamping surface with an opening facing the rotation axis of the turntable. The clamping member is slidably mounted on the turntable via a slider. The slider is slidably mounted on the turntable. The clamping member is mounted on the slider in an adjustable manner, and the opening angle of the V-shaped clamping surface can be adjusted by adjusting the angle.

[0014] The base is rotatably mounted on a pedestal and can switch between a first state and a second state by rotation. In the first state, the rotation axis of the turntable is arranged horizontally, and in the second state, the rotation axis of the turntable is arranged vertically.

[0015] Compared with the prior art, the advantages of the present invention are as follows: The stopwatch calibration clamping device of the present invention drives multiple clamping components to move synchronously, simultaneously approaching and moving away from the rotation axis of the turntable. This enables rapid centering and clamping of stopwatches of different sizes. Simultaneously, the multiple clamping components are mounted on the turntable, allowing for overall adjustment of the circumferential angle of the stopwatch held by the clamping components, ensuring rapid alignment of the stopwatch's start / stop button with the striking mechanism. This overcomes the problems of traditional clamping devices that rely on manual adjustment of each component, resulting in low centering efficiency. It achieves integrated and rapid operation of stopwatch placement, clamping, and alignment, reducing tedious manual operations and significantly improving calibration efficiency. Attached Figure Description

[0016] Figure 1 A three-dimensional structural diagram of a clamping device for stopwatch calibration arranged vertically along the rotation axis of the turntable.

[0017] Figure 2 A three-dimensional structural diagram of a clamping device for stopwatch calibration arranged horizontally along the rotation axis of a turntable.

[0018] Figure 3 A three-dimensional structural diagram of the base and clamping components mounted on a turntable (with a small mechanical stopwatch clamped in place).

[0019] Figure 4 A three-dimensional structural diagram of the base and clamping components mounted on a turntable (clamping a large mechanical stopwatch).

[0020] Figure 5 A three-dimensional structural diagram of the base and clamping components mounted on the turntable (with the electronic stopwatch clamped).

[0021] Figure 6 This is a cross-sectional view of the base and clamping assembly mounted on the turntable.

[0022] Figure 7 A three-dimensional structural diagram of the clamping control component and the angle adjustment component.

[0023] Figure 8 A bottom view of the clamping control component and the angle adjustment component (clamped state).

[0024] Figure 9 A bottom view of the structure of the clamping control component and the angle adjustment component (in the released state).

[0025] Figure 10 This is a three-dimensional structural diagram of the striking mechanism.

[0026] Legend: 1. Base; 2. Clamping assembly; 21. Clamping component; 211. V-shaped clamping surface; 3. Strike mechanism; 31. Strike head; 32. Mounting base; 321. Limiting part; 33. Telescopic rod; 34. Rotating roller; 35. Locking screw; 4. Turntable; 5. Clamping control assembly; 51. Rotating component; 511. Bushing; 52. Connecting rod; 53. Tension spring; 54. Disconnectable ratchet mechanism; 541. Disconnect knob; 542. Lever; 543. Ratchet; 544. Pawl; 55. Release knob; 56. First linkage mechanism; 6. Angle adjustment assembly; 61. Connecting shaft; 62. Angle adjustment knob; 63. Second linkage mechanism; 7. Base. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] like Figures 1 to 5 As shown, the stopwatch calibration clamping device of this embodiment includes a base 1, a clamping assembly 2 for clamping and fixing the stopwatch, and a striking mechanism 3 mounted on the base 1. A rotating turntable 4 is mounted on the base 1. The clamping assembly 2 is mounted on the turntable 4 and includes a plurality of clamping members 21 arranged around the rotation axis of the turntable 4. Each clamping member 21 is mounted on the turntable 4 in a manner that allows adjustment of the distance between it and the rotation axis of the turntable 4. The stopwatch calibration clamping device also includes a clamping control assembly 5 for driving the plurality of clamping members 21 to move synchronously to simultaneously approach and move away from the rotation axis of the turntable 4, and an angle adjustment assembly 6 for adjusting the rotation angle of the turntable 4. This stopwatch calibration clamping device, driven by the clamping control component 5, synchronously moves multiple clamping parts 21 to simultaneously approach and move away from the rotation axis of the turntable 4. This enables rapid centering and clamping of stopwatches of different sizes. Simultaneously, the multiple clamping parts 21 of the clamping component 2 are mounted on the turntable 4, allowing for overall adjustment of the circumferential angle of the stopwatch held by the clamping parts 21, enabling rapid alignment of the stopwatch's start / stop button with the striking mechanism 3. This overcomes the problems of traditional clamping devices that rely on manual adjustment of each part individually, resulting in low centering efficiency. It achieves integrated and rapid operation of stopwatch placement, clamping, and alignment, reducing tedious manual operations and significantly improving calibration efficiency.

[0029] Preferably, in this embodiment, the clamping assembly 2 is provided with three clamping members 21, which are evenly arranged around the rotation axis of the turntable 4, and the angles of the three members differ by 120°.

[0030] In this embodiment, as Figures 6 to 9As shown, the clamping control assembly 5 includes an elastic mechanism for elastically forcing multiple clamping members 21 to move closer to the rotation axis of the turntable 4, and a manual control mechanism for overcoming the elastic effect of the elastic mechanism to drive the multiple clamping members 21 away from the rotation axis of the turntable 4 and locking the clamping members 21 in multiple different positions. The elastic mechanism moves the multiple clamping members 21 closer to the rotation axis of the turntable 4, enabling rapid clamping and fixing of the stopwatch without extensive manual adjustment, further reducing tedious manual operations and improving calibration efficiency. Furthermore, the elastic mechanism provides a continuous centripetal clamping force, ensuring clamping stability and adaptability. The manual control mechanism allows precise control of the opening degree of the clamping members 21 and locking their positions, facilitating the insertion and removal of the stopwatch. This clamping control assembly 5 structure ensures both clamping reliability and improves operational controllability and convenience, making it particularly suitable for calibration applications involving frequent changes of stopwatches of different specifications.

[0031] In this embodiment, the clamping control component 5 includes a rotating member 51 rotatably mounted on the turntable 4. Each clamping member 21 is connected to the rotating member 51 via a connecting rod 52. One end of the connecting rod 52 is hinged to the clamping member 21, and the other end is hinged to the rotating member 51. The hinge axis between the connecting rod 52 and the rotating member 51 is offset from the rotation axis of the rotating member 51, so that when the rotating member 51 rotates, it drives multiple clamping members 21 to move synchronously through the connecting rod 52. The elastic mechanism includes a tension spring 53 connected between the clamping member 21 and the rotating member 51. By using the transmission method of the rotating member 51 and the connecting rod 52, the rotational motion of the rotating member 51 is converted into the synchronous radial linear motion of multiple clamping members 21, ensuring the consistency of movement of each clamping point, thereby realizing the automatic centering clamping of the stopwatch. The tension spring 53, as an elastic element, acts directly between the clamping member 21 and the rotating member 51. It has a compact structure, direct force transmission, and enhances the system's response speed and the uniformity of clamping force, which is beneficial for protecting the stopwatch casing from excessive local pressure. The aforementioned rotating component 51 is an equilateral triangular plate located below the turntable 4. The center of the equilateral triangular plate coincides with the rotation axis of the turntable 4, and the hinge points of the three connecting rods 52 and the equilateral triangular plate are equidistant from the rotation center of the equilateral triangular plate.

[0032] In this embodiment, the manual control mechanism includes a disconnectable ratchet mechanism 54 and a release knob 55 rotatably mounted on the base 1. The release knob 55 is connected to the rotating member 51 through a first linkage mechanism 56 and can drive the rotating member 51 to rotate by turning the release knob 55. The disconnectable ratchet mechanism 54 includes a disconnect knob 541, a lever 542, a ratchet 543 connected to the release knob 55, and a pawl 544 rotatably mounted on the base 1. The pawl 544 is connected to a torsion spring that makes the pawl 544 contact the ratchet 543. When the pawl 544 contacts the ratchet 543, the release knob 55 can only rotate unidirectionally in the direction that moves the clamping member 21 away from the rotation axis of the turntable 4. The lever 542 is rotatably mounted on the base 1 and can rotate the pawl 544 to overcome the torsion spring force and disconnect it from the ratchet 543 by rotating it. The disconnect knob 541 is connected to the lever 542. When the disconnect knob 541 is not operated, the pawl 544 remains in contact with the ratchet 543 under the action of the torsion spring. The release knob 55 can only rotate unidirectionally in the direction that moves the clamping member 21 away from the rotation axis of the turntable 4. At this time, simply turn the release knob 55 to drive the clamping member 21 away from the rotation axis of the turntable 4 to release the clamped stopwatch. After the clamping member 21 moves to the appropriate position, release the release knob 55. Under the cooperation of the pawl 544 and the ratchet 543, the release knob 55 cannot rotate in the opposite direction, thereby locking the clamping member 21 and making it easy to pick up and put down the stopwatch. After the stopwatch is placed, simply turn the disconnect knob 541 to make the lever 542 move the pawl 544 to overcome the torsion spring force (tension spring 53) and rotate to disconnect from the ratchet 543. Under the action of the tension spring 53, the clamping member 21 automatically moves closer to the rotation axis of the turntable 4, thereby clamping and fixing the stopwatch. The combination of the manual control mechanism and the tension spring 53 enables self-locking and rapid release during the opening process of the clamping member 21, greatly simplifying the operation steps. It has the advantages of simple structure, low cost, and easy operation. The aforementioned first linkage mechanism 56 adopts a worm gear mechanism; in other embodiments, a bevel gear mechanism or similar can also be used.

[0033] In this embodiment, the angle adjustment component 6 includes a connecting shaft 61 connected to the turntable 4 and an angle adjustment knob 62 rotatably mounted on the base 1. One end of the connecting shaft 61 is connected to the bottom of the turntable 4, and the other end is rotatably connected to the base 1. The angle adjustment knob 62 is connected to the connecting shaft 61 through a second linkage mechanism 63 and can drive the connecting shaft 61 to rotate by turning the angle adjustment knob 62. After the clamping member 21 clamps the stopwatch, the rotation of the connecting shaft 61 can be adjusted by turning the angle adjustment knob 62. The connecting shaft 61 rotates the turntable 4, thereby adjusting the circumferential angle of the clamped stopwatch, so that the start / stop button of the stopwatch is accurately aligned with the striking mechanism 3. This angle adjustment component 6 has a simple and compact structure and is easy to adjust. The aforementioned second linkage mechanism 63 adopts a worm gear mechanism; in other embodiments, a bevel gear mechanism or the like can also be used.

[0034] In this embodiment, the rotating component 51 is rotatably mounted on the connecting shaft 61 via a bushing 511. The design of the rotating component 51 being mounted on the connecting shaft 61 via the bushing 511 achieves a compact layout and motion decoupling between the clamping control component 5 and the angle adjustment component 6. The two components can operate independently without interfering with each other, which not only ensures the stability of the overall structure but also simplifies the internal transmission structure and reduces assembly difficulty and manufacturing cost.

[0035] In this embodiment, as Figure 10 As shown, the striking mechanism 3 includes a striking head 31 and a mounting base 32 mounted on the base 1. The striking head 31 is mounted on the mounting base 32 in a manner that allows adjustment of the distance between it and the rotation axis of the turntable 4. This striking mechanism 3 can flexibly adapt to stopwatches of different sizes and button positions, expanding its applicability. By adjusting the distance between the striking head 31 and the rotation axis of the turntable 4, it ensures that the striking head 31 can accurately and fully trigger the stopwatch start / stop button, solving the problem of incomplete or excessive striking caused by differences in stopwatch size and model.

[0036] In this embodiment, the adjustment mechanism includes a telescopic rod 33, a rotating roller 34, and a locking screw 35. The mounting base 32 has two limiting parts 321, through which the telescopic rod 33 passes. A striking head 31 is located at one end of the telescopic rod 33. The rotating roller 34 is threadedly engaged with the telescopic rod 33 and is located between the two limiting parts 321. The locking screw 35 is threadedly engaged with one limiting part 321 and can be tightened and loosened by screwing. When the locking screw 35 is tightened to loosen the telescopic rod 33, the rotating roller 34 is rotated. Under the restriction of the two limiting parts 321, the telescopic rod 33 can reciprocate linearly, thereby adjusting the distance between it and the rotation axis of the turntable 4. When the locking screw 35 is tightened to tighten the telescopic rod 33, the telescopic rod 33 can be fixed. The adjustment mechanism uses a rotating roller 34 and a threaded connection between the telescopic rod 33 and the telescopic rod 33 to achieve the position of the telescopic rod 33, ensuring a smooth and precise adjustment process. Rigid fixation via a locking screw 35 guarantees structural stability and consistent action during impact, preventing positional shifts caused by vibration or impact, thus ensuring the accuracy and reliability of triggering during calibration. It boasts advantages such as simple structure, low cost, and easy adjustment.

[0037] In this embodiment, the clamping member 21 has a V-shaped clamping surface 211 with its opening facing the rotation axis of the turntable 4. The clamping member 21 is slidably mounted on the turntable 4 via a slider, and the slider is slidably mounted on the turntable 4. The clamping member 21 is mounted on the slider in an adjustable manner, and the opening angle of the V-shaped clamping surface 211 can be adjusted by adjusting the angle. The V-shaped clamping surface 211 of the clamping member 21 can adaptively clamp circular or cylindrical stopwatches, achieving good centering and force distribution. Adjusting the angle of the V-shaped clamping surface 211 allows it to fit well with the outer contour of non-circular or irregularly shaped stopwatches (such as electronic stopwatches). This design greatly improves the versatility of the clamping device, enabling it to reliably clamp various types of stopwatches, such as mechanical stopwatches, electronic stopwatches, and irregularly shaped stopwatches, meeting a wider range of calibration needs. Preferably, the slider is slidably positioned along a radial limiting groove provided on the turntable 4. The aforementioned clamping member 21 is rotatably mounted on the slider via a rotating shaft, and the opening angle of the V-shaped clamping surface 211 can be adjusted by rotation. Preferably, a screw that is threadedly engaged with the clamping member 21 is also provided. By tightening the screw, the clamping member 21 can be pressed to fix it, and the slider can be loosened so that the clamping member 21 can be rotated to adjust the angle.

[0038] In this embodiment, as Figure 1 and Figure 2 As shown, the base 1 is rotatably mounted on a base 7 and can switch between a first state and a second state by rotation. In the first state, the rotation axis of the turntable 4 is arranged horizontally, and in the second state, the rotation axis of the turntable 4 is arranged vertically. By designing the turntable 4 to be able to switch between horizontal and vertical positions relative to the base 7, the clamping device can meet the calibration requirements of the calibration specification for calibrating the stopwatch in both horizontal and vertical states. This design avoids the need to purchase two sets of dedicated equipment or make complex modifications, improves the utilization rate of the equipment, simplifies the calibration process, and ensures the consistency of clamping stability and alignment accuracy in both calibration states.

[0039] The above description is merely a preferred embodiment of the present invention, and the scope of protection of the present invention is not limited to the above embodiments. For those skilled in the art, improvements and modifications obtained without departing from the inventive concept should also be considered within the scope of protection of the present invention.

Claims

1. A clamping device for stopwatch calibration, comprising a base (1), a clamping assembly (2) for clamping a stopwatch and a striking mechanism (3) mounted on the base (1), characterized in that: The base (1) is provided with a rotary table (4) rotatably arranged on the base (1), and the clamping assembly (2) is arranged on the rotary table (4), wherein the clamping assembly (2) comprises a plurality of clamping members (21) arranged around the rotary axis of the rotary table (4), each clamping member (21) is arranged on the rotary table (4) in a manner that the distance between the clamping member (21) and the rotary axis of the rotary table (4) can be adjusted, and the second hand watch calibration clamping device further comprises a clamping control assembly (5) for driving the plurality of clamping members (21) to move synchronously to approach and move away from the rotary axis of the rotary table (4) simultaneously, and an angle adjusting assembly (6) for adjusting the rotary angle of the rotary table (4).

2. The stop watch calibration clamping device according to claim 1, characterized in that: The clamping control assembly (5) comprises an elastic mechanism for elastically forcing the plurality of clamping members (21) to move towards the rotary axis of the rotary table (4), and a manual control mechanism for driving the plurality of clamping members (21) to move away from the rotary axis of the rotary table (4) against the elastic action of the elastic mechanism and locking the clamping members (21) at a plurality of different positions.

3. The chronograph calibration clamp of claim 2, wherein: The clamping control assembly (5) comprises a rotating member (51) rotatably arranged on the rotary table (4), each clamping member (21) is connected to the rotating member (51) through a connecting rod (52), one end of the connecting rod (52) is hingedly connected to the clamping member (21), the other end of the connecting rod (52) is hingedly connected to the rotating member (51), and the hinging axis of the connecting rod (52) and the rotating member (51) deviates from the rotary axis of the rotating member (51), so that the rotating member (51) is rotated to drive the plurality of clamping members (21) to move synchronously through the connecting rod (52), and the elastic mechanism comprises a tension spring (53) connected between the clamping member (21) and the rotating member (51).

4. The stop watch calibrating clamping device according to claim 3, wherein: The manual control mechanism comprises a disconnectable ratchet mechanism (54) and a loosening knob (55) rotatably arranged on the base (1), the loosening knob (55) is connected to the rotating member (51) through a first linkage mechanism (56) and can drive the rotating member (51) to rotate by screwing the loosening knob (55), the disconnectable ratchet mechanism (54) comprises a disconnecting knob (541), a lever (542), a ratchet wheel (543) connected to the loosening knob (55), and a pawl (544) rotatably arranged on the base (1), the pawl (544) is connected to a torsion spring for making the pawl (544) contact the ratchet wheel (543), the loosening knob (55) can only be unidirectionally rotated in a direction for making the clamping member (21) move away from the rotary axis of the rotary table (4) when the pawl (544) contacts the ratchet wheel (543), the lever (542) is rotatably arranged on the base (1) and can rotate to disconnect the pawl (544) from the ratchet wheel (543) by overcoming the action force of the torsion spring, and the disconnecting knob (541) is connected to the lever (542).

5. The stop watch calibrating clamping device according to claim 3, wherein: The angle adjusting assembly (6) comprises a connecting shaft (61) connected with the rotating table (4) and an angle adjusting knob (62) rotatably installed on the base (1), the angle adjusting knob (62) is connected with the connecting shaft (61) through a second linkage mechanism (63) and can drive the connecting shaft (61) to rotate by rotating the angle adjusting knob (62).

6. The chronograph calibration clamp of claim 5, wherein: The rotating part (51) is rotatably sleeved on the connecting shaft (61) through a shaft sleeve (511).

7. The chronograph calibration clamp of claim 1, wherein: The striking mechanism (3) comprises a striking head (31) and a mounting base (32) mounted on the base (1), the striking head (31) is mounted on the mounting base (32) in a manner that the distance between the striking head (31) and the rotating axis of the rotating table (4) can be adjusted through an adjusting mechanism.

8. The chronograph calibration clamp of claim 7, wherein: The adjusting mechanism comprises an extension rod (33), a rotating roller (34) and a locking screw (35), the mounting base (32) is provided with two limiting portions (321), the extension rod (33) is arranged through the two limiting portions (321), the striking head (31) is arranged at one end of the extension rod (33), the rotating roller (34) is threadedly connected with the extension rod (33) and located between the two limiting portions (321), and the locking screw (35) is threadedly connected with one limiting portion (321) and can press and release the extension rod (33) by rotating.

9. The chronograph calibration clamp of claim 1, wherein: The clamping part (21) is provided with a V-shaped clamping surface (211) with an opening direction towards the rotating axis of the rotating table (4), the clamping part (21) is slidably installed on the rotating table (4) through a sliding block, the sliding block is slidably installed on the rotating table (4), the clamping part (21) is installed on the sliding block in a manner that the angle can be adjusted, and the opening direction angle of the V-shaped clamping surface (211) can be adjusted by adjusting the angle.

10. Stopwatch calibration clamping device according to any one of claims 1 to 9, characterized in that The base (1) is rotatably installed on a base (7) and can be switched between a first state and a second state by rotating, in the first state, the rotating axis of the rotating table (4) is horizontally arranged, and in the second state, the rotating axis of the rotating table (4) is vertically arranged.

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