Electric torque wrench calibration tool

Abstract

The utility model belongs to the technical field of calibration tooling, especially relates to a kind of electric torque wrench calibration tooling.It includes: tooling pedestal, tooling pedestal includes front plate, first side plate, back plate and second side plate, front plate, first side plate, back plate and second side plate head-to-tail sequentially connect, and form tooling pedestal by enclosing;Front plate is equipped with the first through-hole for bolt to pass through, back plate is equipped with the second through-hole coaxially opposite to the first through-hole, and the side of back plate away from front plate is equipped with recess, and the two side walls of recess are used to limit bolt head;Gasket, gasket is installed in the side of front plate away from back plate, and located at the outer edge of first through-hole.The electric torque wrench calibration tooling can realize gear calibration, and is used to calibrate electric torque wrench before daily production to ensure torque accuracy, to further guarantee safe production and product quality.It is simple in structure, convenient in processing and low in production cost.

Description

Technical Field

[0001] This utility model belongs to the field of calibration tooling technology, and in particular relates to an electric torque wrench calibration tooling. Background Technology

[0002] With the rapid development of high-speed railway construction in my country, the manufacturing level of turnout products has continued to improve, and their overseas market share has been expanding, propelling my country's high-speed turnout manufacturing technology onto the global stage. In the turnout production process, the quality of bolt tightening directly affects railway operation safety, and the electric torque wrench, as a core tool for controlling bolt tightening torque, has its torque standard that forms the basis for ensuring the stability and durability of the turnout structure.

[0003] Electric torque wrenches are widely used across various industries, and the torque requirements differ significantly between industries and processes. However, with increasing service life, the torque values ​​corresponding to the original settings of an electric torque wrench can drift. This accuracy deviation can have serious consequences in high-precision manufacturing fields such as high-speed turnouts. Industry experience shows that uncalibrated torque wrenches can cause bolts to break due to overtightening or become loose and fail, directly threatening railway operation safety.

[0004] Therefore, accurately calibrating electric torque wrenches before daily production to ensure accurate torque output is a key step in ensuring safe production and product quality.

[0005] Based on this, the present invention provides a novel electric torque wrench calibration fixture to overcome the above-mentioned defects. Utility Model Content

[0006] The purpose of this utility model is to provide an electric torque wrench calibration fixture, which can realize gear calibration and is used to calibrate electric torque wrenches before daily production to ensure accurate torque, thereby ensuring safe production and product quality. It has a simple structure, is easy to process and has low production cost.

[0007] This utility model adopts the following technical solution: an electric torque wrench calibration fixture, comprising:

[0008] A tooling base includes a front plate, a first side plate, a rear plate, and a second side plate, which are connected end to end to form the tooling base. The front plate has a first through hole for bolts to pass through, and the rear plate has a second through hole that is coaxially opposite to the first through hole. The rear plate has a groove on the side away from the front plate, and the two side walls of the groove are used to limit the bolt head.

[0009] A gasket is mounted on the side of the front plate away from the rear plate and located at the outer edge of the first through hole.

[0010] Furthermore, the gasket is detachably installed on the side of the front panel away from the rear panel.

[0011] Furthermore, the gasket is made of an alloy material.

[0012] Furthermore, the surface of the gasket is subjected to knurling for anti-slip and hardening treatment.

[0013] Furthermore, the electric torque wrench calibration fixture also includes:

[0014] Two bolt clips are attached to the two side walls of the groove and the bolt heads are limited by the bolt clips.

[0015] Furthermore, the front panel, the first side panel, the rear panel, and the second side panel are detachably connected.

[0016] Furthermore, the tooling base also includes a base plate, and the front plate, the first side plate, the rear plate and the second side plate are all arranged around the outer edge of the base plate and are abutted or inserted into the base plate.

[0017] Furthermore, a reaction arm is provided on the side of the front plate away from the rear plate.

[0018] Furthermore, the front plate and the rear plate extend outward on both sides to form a support leg structure. Each support leg structure is provided with a mounting hole for fixing the electric torque wrench calibration fixture.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] The working principle of this electric torque wrench calibration fixture is as follows: During use, the bolt to be calibrated is first passed through the first through hole in the front plate and the second through hole in the rear plate, so that the bolt head is engaged in the groove on the side of the rear plate away from the front plate. The two side walls of the groove form a radial limit on the bolt head, preventing the bolt from rotating or shifting under force. After the bolt shank passes through the first through hole, its end protrudes outside the front plate. At this time, the washer located at the outer edge of the first through hole contacts the bolt nut or connector, preventing axial slippage or displacement of the bolt during tightening.

[0021] Subsequently, an electric torque wrench is used to tighten the bolt ends exposed on the outside of the front plate. The tooling base provides rigid support to ensure that the direction of force on the bolt is consistent with the axis of the through hole. After tightening, the actual torque value is obtained by the "tightening method": first, lines are drawn on the nut and washer to make marks, and then the torque applied to the bolt by the electric wrench is measured with a measuring wrench. This value is compared with the torque value required for production, and the range of the electric torque wrench is adjusted appropriately by raising or lowering it. After adjusting the range, a new bolt is replaced, and the above steps of threading, limiting, tightening, marking, measuring and comparing are repeated until the torque value applied to the bolt by the electric torque wrench meets the actual safe production requirements, and the range calibration is completed.

[0022] This utility model of an electric torque wrench calibration fixture enables gear calibration, used to calibrate electric torque wrenches before daily production to ensure accurate torque, thereby guaranteeing safe production and product quality. It features a simple structure, convenient processing, and low production cost.

[0023] Meanwhile, the first and second through holes of the front and rear plates are coaxially aligned, which ensures that the bolt force is consistent with the axis and avoids measurement errors caused by eccentricity; the groove of the rear plate limits the bolt head through the rigid side wall to prevent rotational deviation and ensure stable torque transmission; the gasket is located on the outer edge of the first through hole and works with the bolt to achieve anti-slip and reduce axial displacement and operation deviation during tightening.

[0024] In addition, the tooling base enclosed by four plates is highly rigid and can withstand the instantaneous impact force of the electric torque wrench, reducing calibration vibration interference. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the electric torque wrench calibration fixture in a specific embodiment of the present invention. Figure 1 ;

[0027] Figure 2 This is a schematic diagram of the electric torque wrench calibration fixture in a specific embodiment of the present invention. Figure 2 ;

[0028] Figure 3 for Figure 2 Schematic diagram of the structure of the electric torque wrench calibration fixture after removing the bolts;

[0029] Figure 4This is a schematic diagram of the electric torque wrench calibration fixture in a specific embodiment of the present invention. Figure 3 ;

[0030] Figure 5 This is a diagram showing the use and installation of the electric torque wrench calibration fixture in a specific embodiment of this utility model;

[0031] The components include: front plate 1, first through hole 10, reaction arm 11, support leg structure 12, mounting hole 13; first side plate 2; rear plate 3, second through hole 30, groove 31; second side plate 4; bolt 5; washer 6; bolt clip 7, clip wall 70; bottom plate 8; base 9. Detailed Implementation

[0032] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0033] The following is in conjunction with the appendix Figures 1 to 5 The present invention will be described in detail with reference to specific embodiments:

[0034] like Figures 1 to 4 As shown, this utility model provides an electric torque wrench calibration fixture, which includes:

[0035] The tooling base includes a front plate 1, a first side plate 2, a rear plate 3, and a second side plate 4. The front plate 1, the first side plate 2, the rear plate 3, and the second side plate 4 are connected end to end to form the tooling base. The front plate 1 has a first through hole 10 for a bolt 5 to pass through. The rear plate 3 has a second through hole 30 that is coaxially opposite to the first through hole 10. The rear plate 3 has a groove 31 on the side away from the front plate 1. The two side walls of the groove 31 are used to limit the head of the bolt 5. In this embodiment, a reaction arm 11 is provided on the side of the front plate 1 away from the rear plate 3. The reaction arm 11 is used to provide reaction support when the electric torque wrench applies torque. By balancing the reaction force generated by the wrench, the tooling or wrench is prevented from shifting, ensuring the stability and calibration accuracy of the torque application process.

[0036] Gasket 6 is installed on the side of the front plate 1 away from the rear plate 3 and is located at the outer edge of the first through hole 10.

[0037] The working principle of this electric torque wrench calibration fixture is as follows: During use, the bolt 5 to be calibrated is first passed through the first through hole 10 of the front plate 1 and the second through hole 30 of the rear plate 3, so that the head of the bolt 5 is engaged in the groove 31 on the side of the rear plate 3 away from the front plate 1. The two side walls of the groove 31 form a radial limit on the bolt head, preventing the bolt from rotating or shifting under force. After the threaded portion of the bolt 5 passes through the first through hole 10, its end protrudes outside the front plate 1. At this time, the washer 6 located at the outer edge of the first through hole 10 contacts the nut or connector of the bolt 5, preventing axial slippage or displacement of the bolt during tightening.

[0038] Subsequently, an electric torque wrench is used to tighten the end of bolt 5 exposed on the outside of the front plate 1. The tooling base provides rigid support to ensure that the direction of force on the bolt is consistent with the axis of the through hole. After tightening, the actual torque value is obtained by the "tightening method": first, draw lines on the nut and washer to make marks, then use a measuring wrench to measure the torque applied to the bolt by the electric wrench at this time, compare this value with the torque value required for production, and adjust the setting of the electric torque wrench appropriately by raising or lowering it. After adjusting the setting, replace the new bolt, and repeat the above steps of threading, limiting, tightening, marking, measuring and comparing until the torque value applied to the bolt by the electric torque wrench meets the actual safe production requirements, and the setting calibration is completed.

[0039] This utility model of an electric torque wrench calibration fixture enables gear calibration, used to calibrate electric torque wrenches before daily production to ensure accurate torque, thereby guaranteeing safe production and product quality. It features a simple structure, convenient processing, and low production cost.

[0040] Meanwhile, the first and second through holes of the front plate 1 and the rear plate 3 are coaxially opposite, which can ensure that the bolt 5 is stressed and aligned with the axis, avoiding measurement errors caused by eccentricity; the groove 31 of the rear plate 3 limits the bolt head through the rigid side wall to prevent rotational deviation and ensure stable torque transmission; the gasket 6 is located on the outer edge of the first through hole 10, and works with the bolt 5 to achieve anti-slip, reducing axial displacement and operational deviation during tightening.

[0041] In addition, the tooling base enclosed by four plates is highly rigid and can withstand the instantaneous impact force of the electric torque wrench, reducing calibration vibration interference.

[0042] Furthermore, in some specific embodiments, the gasket 6 is detachably installed on the side of the front plate 1 away from the rear plate 3. This detachable design allows for individual replacement after repeated use and subsequent slip failure, thus quickly restoring the tooling's anti-slip positioning function and ensuring its continued normal use.

[0043] In this embodiment, the pad 6 is an anti-slip pad made of alloy material. The anti-slip pad surface is knurled for anti-slip and surface hardened. It can stably prevent slipping under high torque calibration scenarios and has long-term durability with wear resistance, deformation resistance, oil resistance, and high and low temperature resistance.

[0044] When the electric torque wrench tightens the bolt 5, the material of the washer 6 can effectively limit the axial slippage and circumferential displacement of the bolt through high friction, avoid the bolt positioning misalignment caused by the slippage of the washer 6, and thus prevent the "force loss deviation" in the torque transmission process. It directly provides anti-slip supplement for structures such as "coaxial positioning of the first through hole and the second through hole" and "groove limiting bolt head", ensuring the accuracy of the calibration data of the "tightening method".

[0045] Furthermore, in some specific embodiments, the electric torque wrench calibration fixture further includes:

[0046] Two bolt clips 7 are snapped onto the side walls of the groove 31, and the bolt heads 5 are limited by the bolt clips 7. The bolt clips 7 are the load-bearing components that directly contact the bolt heads 5, and are prone to wear and tear such as groove wear and clip deformation after long-term use. Because of its snap-fit ​​and detachable design, only a single bolt clip 7 needs to be replaced after wear, without replacing the entire back plate 3 or the tooling base, significantly reducing maintenance costs.

[0047] Specifically, in this embodiment, the snap-fit ​​wall 70 of the bolt clip 7 has various sizes to accommodate different bolt sizes and improve versatility. The size of the snap-fit ​​wall 70 directly matches the key dimensions of the bolt head 5, such as the distance between opposite sides of a hexagonal bolt. For common bolt sizes such as M12, M16, M20, and M24, precise matching can be achieved by customizing the wall thickness of the snap-fit ​​wall 70 of the bolt clip 7. That is, by adjusting the wall thickness of the snap-fit ​​wall 70, the distance between the snap-fit ​​walls 70 of two bolt clips 7 is controlled to perfectly match the size of the bolt head of the corresponding size.

[0048] Therefore, the same tooling base does not require modification to the main structure; only the bolt clips 7 adapted to the corresponding bolt specifications need to be replaced to achieve limit adaptation for bolts of different specifications, completely solving the limitation of traditional tooling that "a single specification can only adapt to one type of bolt." This design allows the tooling to cover torque calibration needs in multiple fields such as turnout production, mechanical assembly, and building construction, without the need to customize a complete set of tooling for different bolt specifications, significantly improving the equipment's versatility and adaptation efficiency.

[0049] Furthermore, in some specific embodiments, the front plate 1, the first side plate 2, the rear plate 3, and the second side plate 4 are detachably connected. It should be noted that the specific implementation method of the detachable connection is not limited in this invention; it can be a bolt connection, tenon and mortise joint, plug-in connection, snap-fit ​​connection, etc. The detachable connection enables "individual replacement of damaged parts," meaning that when any of the front plate 1, the first side plate 2, the rear plate 3, or the second side plate 4 is damaged, it is not necessary to scrap the entire tooling base; only the damaged plate needs to be disassembled and replaced, reducing maintenance costs.

[0050] Specifically, if the bolt 5 is too long, insufficient front-to-back spacing of the tooling base will cause the exposed part of the bolt 5 to wobble, resulting in torque transmission deviation. If the bolt is too short, it may not be able to penetrate the second through hole 30 of the rear plate 3, causing the bolt head to be unable to be precisely positioned with the groove 31. The detachable connection allows the tooling base to be dimensionally adjustable. By replacing the first side plate 2 and the second side plate 4 of different lengths (the length along the direction from the front plate 1 to the rear plate 3), the front-to-back spacing of the tooling base can be flexibly adjusted. This eliminates the need to redesign and manufacture the entire tooling set. By simply replacing the side plates, "the same base can accommodate multiple common bolt lengths," completely solving the limitation of traditional fixed structures where "one type of side plate can only accommodate one type of bolt," and further enhancing the tooling's adaptability to multiple bolt specifications.

[0051] Furthermore, in some specific embodiments, the tooling base also includes a base plate 8. The front plate 1, the first side plate 2, the rear plate 3, and the second side plate 4 are all arranged around the outer edge of the base plate 8 and are abutted or plugged into the base plate 8. After the four plates are connected around the outer edge of the base plate 8, the "planar frame structure" is upgraded to a "three-dimensional box structure," so that the force on the four plates is transmitted in a closed loop through the base plate 8. That is, the impact load is transmitted from the rear plate 3 (the bolt head limiting end) to the base plate, and then distributed to the front plate 1 and the two side plates, thus improving the overall deformation resistance. Even if the four plates are detachably connected, the base plate 8 can limit the relative displacement between the plates through abutment / plugging positioning, ensuring that the tooling base does not shake or deform during calibration, providing a structural basis for precise positioning and torque transmission.

[0052] Furthermore, in some specific embodiments, the front plate 1 and the rear plate 3 extend outwards on both sides to form symmetrically distributed support leg structures 12. Each support leg structure 12 has mounting holes 13 for fixing the electric torque wrench calibration fixture. In use, the fixture base can be securely mounted on the base 9 through the mounting holes 13 and fasteners (such as bolts or pins). Figure 5 As shown.

[0053] Furthermore, the outer surface of the electric torque wrench calibration fixture can be hardened, or only the outer surface in contact with the bolt 5 can be hardened to enhance wear resistance.

[0054] The present invention has been further described above with reference to specific embodiments. However, it should be understood that the specific description herein should not be construed as limiting the substance and scope of the present invention. Various modifications made by those skilled in the art to the above embodiments after reading this specification are all within the scope of protection of the present invention.

Claims

1. A calibration fixture for an electric torque wrench, characterized in that: It includes: A tooling base includes a front plate, a first side plate, a rear plate, and a second side plate, which are connected end to end to form the tooling base. The front plate has a first through hole for bolts to pass through, and the rear plate has a second through hole that is coaxially opposite to the first through hole. The rear plate has a groove on the side away from the front plate, and the two side walls of the groove are used to limit the bolt head. A gasket is mounted on the side of the front plate away from the rear plate and located at the outer edge of the first through hole.

2. The electric torque wrench calibration fixture according to claim 1, characterized in that: The gasket is detachably installed on the side of the front panel away from the rear panel.

3. The electric torque wrench calibration fixture according to claim 1, characterized in that: The gasket is made of alloy material.

4. The electric torque wrench calibration fixture according to claim 3, characterized in that: The surface of the gasket is knurled for anti-slip and hardened.

5. The electric torque wrench calibration fixture according to claim 1, characterized in that: The electric torque wrench calibration fixture also includes: Two bolt clips are attached to the two side walls of the groove and the bolt heads are limited by the bolt clips.

6. The electric torque wrench calibration fixture according to claim 5, characterized in that: The buckle wall of the bolt clip has various sizes to accommodate different bolt sizes.

7. The electric torque wrench calibration fixture according to claim 1, characterized in that: The front panel, the first side panel, the rear panel, and the second side panel are detachably connected.

8. The electric torque wrench calibration fixture according to claim 1, characterized in that: The tooling base also includes a base plate. The front plate, the first side plate, the rear plate, and the second side plate are all arranged around the outer edge of the base plate and are abutted or inserted into the base plate.

9. The electric torque wrench calibration fixture according to claim 1, characterized in that: The front plate is provided with a reaction arm on the side away from the rear plate.

10. The electric torque wrench calibration fixture according to claim 1, characterized in that: The front plate and the rear plate extend outward from both sides to form a support structure. Each support structure has a mounting hole for fixing the electric torque wrench calibration fixture.

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