Visual anti-loosening mechanism of constant-value torque wrench

Abstract

A visual anti-loosening mechanism of a constant value torque wrench comprises a torque wrench body, a mounting cavity is formed in the torque wrench body, a torque spring is coaxially arranged in the mounting cavity, a through hole matched with the mounting cavity in size is formed in the tail end of the torque wrench body, and the outside and the mounting cavity are communicated through the through hole. An inner thread is arranged on the side, close to the through hole, of the mounting cavity to form an inner threaded hole, an inner adjusting nut and an inner lock nut are sequentially connected into the inner threaded hole in a threaded mode from inside to outside, the end of the torque spring abuts against the inner adjusting nut, and an anti-loosening head used for feeding back the axial position of the inner lock nut is further installed in the inner threaded hole in a threaded mode. One end of the anti-loosening head is installed in the inner threaded hole in a threaded mode and connected with the inner anti-loosening nut in an abutting mode, the other end of the anti-loosening head extends out of the inner threaded hole to form an identification end, and the identification end of the anti-loosening head and the tail end of the torque wrench body are correspondingly provided with anti-dislocation identifications. The torque wrench can be applied to constant-value torque wrenches with different measuring ranges and sizes.

Description

Technical Field

[0001] The utility model belongs to the field of torque wrenches, and in particular relates to a visible anti-loosening mechanism of a fixed-value torque wrench. Background Art

[0002] Threaded connection is a commonly used connection method in automobile assembly, and fixed-value torque wrenches are widely used in the thread tightening process in automobile assembly workshops due to their low price, long service life, and convenient maintenance and calibration. For existing complete vehicles, there are as many as thousands of bolt tightening points involved, and the number of fixed-value torque wrenches is generally as many as hundreds. Usually, in order to ensure that the fixed-value torque wrench meets the rated torque, each fixed-value torque wrench will be inspected and calibrated within the calibration cycle. However, between two calibration cycles, the fixed-value torque wrench may be damaged or malfunction, resulting in torque changes, especially torque wrenches that are used frequently and torque wrenches that have been in service for a long time. However, since the adjusting nut is inside the wrench, the user cannot simply identify whether the torque wrench is loose by appearance, and it can only be discovered during the next routine calibration and inspection. This makes it easy to cause bolt tightening hazards and quality traceability risks when the torque wrench is used between two calibration cycles. Utility Model Content

[0003] The utility model solves the shortcomings of the prior art and provides a visual anti-loosening mechanism of a fixed value torque wrench which has a simple structure, low cost and can quickly judge whether the torque exceeds the tolerance.

[0004] To achieve the above-mentioned purpose, the utility model firstly proposes a visual anti-loosening mechanism of a fixed-value torque wrench, including a torque wrench body, a mounting cavity is provided in the torque wrench body, a torque spring is coaxially arranged in the mounting cavity, a through hole is provided at the tail end of the torque wrench body with a size matching the mounting cavity, the through hole connects the outside with the mounting cavity, an internal thread is provided on one side of the mounting cavity close to the through hole to form an internal threaded hole, an internal adjusting nut and an internal anti-loosening nut which abut against each other are threadedly connected in sequence from the inside to the outside in the internal threaded hole, the end of the torque spring abuts against the internal adjusting nut, an anti-loosening head for feedback of the axial position of the internal anti-loosening nut is also threadedly installed in the internal threaded hole, one end of the anti-loosening head is threadedly installed in the internal threaded hole and abuts against the internal anti-loosening nut, the other end of the anti-loosening head extends out of the internal threaded hole to form an identification end, and anti-misalignment identification is provided on the identification end of the anti-loosening head and the tail end of the torque wrench body accordingly.

[0005] In this embodiment, the anti-loosening head includes a threaded push rod and a knob fixed on the top of the threaded push rod. The threaded push rod is threadedly connected in the internal threaded hole, and the bottom end of the threaded push rod abuts against the internal anti-loosening nut.

[0006] In this embodiment, an anti-slip layer is provided on the knob.

[0007] In this embodiment, the anti-misalignment mark includes a first mark set on the anti-loosening head and a second mark set on the tail end of the torque wrench body, and the first mark and the second mark are scales arranged along the axial direction; after torque calibration, the first mark is connected to the second mark and is in the same straight line. Before use, by observing whether the first mark and the second mark are misaligned, it is possible to quickly determine whether the torque is out of tolerance.

[0008] In this embodiment, the mounting cavity of the torque wrench body extends out of the tail end to form a sleeve, the second mark is set on the sleeve, the threaded push rod includes an external thread section and a smooth section, and the first mark is set on the smooth section of the threaded push rod.

[0009] In this embodiment, the axial length of the sleeve is 10 mm to 15 mm.

[0010] With the above structure, the device has the following advantages:

[0011] 1. The anti-loosening head of the device is assembled in the installation cavity of the torque wrench body by thread. After the anti-loosening head abuts against the internal anti-loosening nut inside the torque wrench body, on the one hand, it can further prevent the adjusting nut and the locking nut from loosening and shaking, and avoid the excessive tolerance caused by the spring elongation exceeding the rated torque; on the other hand, through the anti-misalignment mark, each time in use, by observing whether the anti-misalignment mark is misaligned, it is possible to quickly judge whether the torque is excessive, thereby realizing visual anti-loosening of the fixed value torque wrench, making anti-loosening intuitive, convenient and efficient.

[0012] 2. The anti-loosening head of this device includes a threaded push rod and a knob. The threaded push rod can be conveniently tightened by the knob. Before each use, the threaded push rod is ensured to be in contact with the inner anti-loosening nut by turning the knob, and then the anti-dislocation mark is observed to ensure the accuracy of the judgment.

[0013] 3. The anti-misalignment mark of the device includes a first mark and a second mark, the second mark is set on the sleeve, the threaded push rod includes an external thread section and a smooth section, and the first mark is set on the smooth section of the threaded push rod, so that the first mark and the second mark are both in a position for convenient observation, thereby improving convenience of use.

[0014] In summary, the utility model has a simple structure, is easy to manufacture, and has a low cost, and can be applied to fixed-value torque wrenches of different ranges and sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model.

[0016] Figure 2 It is a structural schematic diagram of the connection between the anti-loosening head and the sleeve of the utility model.

[0017] In the accompanying drawings, 1. torque wrench body; 11. internal threaded hole; 12. internal adjusting nut; 13. internal anti-loosening nut; 14. sleeve; 15. second identification; 2. anti-loosening head; 21. threaded push rod; 211. smooth section; 22. knob; 23. first identification. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0020] like Figure 1 As shown, a visual anti-loosening mechanism of a fixed-value torque wrench comprises a torque wrench body 1, a mounting cavity is provided in the torque wrench body 1, a torque spring is coaxially arranged in the mounting cavity, a through hole is provided at the tail end of the torque wrench body 1 which matches the size of the mounting cavity, the through hole connects the outside with the mounting cavity, an internal thread is provided on one side of the mounting cavity close to the through hole to form an internal threaded hole 11, an internal adjusting nut 12 and an internal anti-loosening nut 13 which abut against each other are threadedly connected in sequence from the inside to the outside in the internal threaded hole 11, an end of the torque spring abuts against the internal adjusting nut 12, an anti-loosening head 2 for feedback of the axial position of the internal anti-loosening nut 13 is also threadedly installed in the internal threaded hole 11, one end of the anti-loosening head 2 is threadedly installed in the internal threaded hole 11 and abuts against the internal anti-loosening nut 13, the other end of the anti-loosening head 2 extends out of the internal threaded hole 11 to form an identification end, and anti-misalignment identification is provided on the identification end of the anti-loosening head 2 and the tail end of the torque wrench body 1 accordingly.

[0021] Specifically, the anti-loosening head 2 includes a threaded push rod 21 and a knob 22 fixed on the top of the threaded push rod 21, the threaded push rod 21 is threadedly connected in the internal threaded hole 11, the bottom end of the threaded push rod 21 abuts against the internal anti-loosening nut 13, and the knob 22 is provided with an anti-slip layer. The anti-misalignment mark includes a first mark 23 set on the anti-loosening head 2 and a second mark 15 set on the tail end of the torque wrench body 1, the first mark 23 and the second mark 15 are both scales arranged along the axial direction, after torque calibration, the first mark 23 is connected to the second mark 15 and is in the same straight line, further, the first mark 23 and the second mark 15 can also be provided with color, so that by observing whether the first mark 23 and the second mark 15 are misaligned, it is possible to quickly judge whether the torque is out of tolerance.

[0022] In order to facilitate the setting of the anti-misalignment mark and make the position of the anti-misalignment mark easier to observe, the installation cavity of the torque wrench body 1 extends out of the tail end to form a sleeve 14, and the axial length of the sleeve 14 is 10mm~15mm. The second mark 15 is set on the sleeve 14, and the threaded push rod 21 includes an external thread section and a smooth section 211. The first mark 23 is set on the smooth section 211 of the threaded push rod 21.

[0023] When in use, the threaded push rod 21 is threadedly assembled in the mounting cavity of the torque wrench body 1. After the threaded push rod 21 abuts against the internal anti-loosening nut 13 inside the torque wrench body, on the one hand, it can further prevent the adjusting nut and the locking nut from loosening and shaking, and avoid the excessive deviation caused by the spring elongation exceeding the rated torque; on the other hand, through the anti-misalignment mark, each time in use, tighten the anti-loosening head 2, observe the anti-misalignment mark, and see whether the first mark 23 and the second mark 15 are misaligned, so as to quickly judge whether the torque is excessive. It is intuitive, convenient and efficient.

[0024] The above are only preferred embodiments of the present invention, and do not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A visual anti-loosening mechanism for a fixed value torque wrench, comprising a torque wrench body (1), wherein a mounting cavity is provided in the torque wrench body (1), wherein a torque spring is coaxially arranged in the mounting cavity, and wherein: The rear end of the torque wrench body (1) is provided with a through hole matching the size of the installation cavity, the through hole connects the outside with the installation cavity, the installation cavity is provided with an internal thread on one side close to the through hole to form an internal threaded hole (11), the internal threaded hole (11) is threadedly connected with an internal adjustment nut (12) and an internal anti-loosening nut (13) which abut against each other in sequence from the inside to the outside, the end of the torque spring abuts against the internal adjustment nut (12), the internal threaded hole (11) is also threadedly installed with an anti-loosening head (2) for feedback of the axial position of the internal anti-loosening nut (13), one end of the anti-loosening head (2) is threadedly installed in the internal threaded hole (11) and abuts against the internal anti-loosening nut (13), the other end of the anti-loosening head (2) extends out of the internal threaded hole (11) to form an identification end, and the identification end of the anti-loosening head (2) and the rear end of the torque wrench body (1) are correspondingly provided with anti-dislocation identification.

2. The visual anti-loosening mechanism of a fixed value torque wrench according to claim 1, characterized in that: The anti-loosening head (2) comprises a threaded push rod (21) and a knob (22) fixed on the top of the threaded push rod (21); the threaded push rod (21) is threadedly connected in the internal threaded hole (11); and the bottom end of the threaded push rod (21) abuts against the internal anti-loosening nut (13).

3. The visual anti-loosening mechanism of a fixed value torque wrench according to claim 2, characterized in that: The knob (22) is provided with an anti-slip layer.

4. The visual anti-loosening mechanism of a fixed value torque wrench according to claim 1, characterized in that: The anti-dislocation mark comprises a first mark (23) arranged on the anti-loosening head (2) and a second mark (15) arranged on the rear end of the torque wrench body (1); the first mark (23) and the second mark (15) are both scales arranged along the axial direction.

5. The visual anti-loosening mechanism of a fixed value torque wrench according to claim 2 or 3, characterized in that: The anti-dislocation mark comprises a first mark (23) arranged on the anti-loosening head (2) and a second mark (15) arranged on the rear end of the torque wrench body (1); the first mark (23) and the second mark (15) are both scales arranged along the axial direction.

6. The visual anti-loosening mechanism of a fixed value torque wrench according to claim 5, characterized in that: The installation cavity of the torque wrench body (1) extends out of the rear end to form a sleeve (14), the second mark (15) is arranged on the sleeve (14), the threaded push rod (21) comprises an external thread section and a smooth section (211), and the first mark (23) is arranged on the smooth section (211) of the threaded push rod (21).

7. The visual anti-loosening mechanism of a fixed value torque wrench according to claim 6, characterized in that: The axial length of the sleeve (14) is 10 mm to 15 mm.

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