A bolt preload calibration force measuring instrument

Abstract

This utility model belongs to the field of testing equipment and relates to a bolt preload calibration force measuring instrument. It includes a testing platform and a sleeve-type axial force sensor. A testing motor is mounted on the testing platform, and the output end of the testing motor is connected to a dynamic torque detector. The output end of the dynamic torque detector can be plugged into and connected to a nut sleeve. A testing assembly is also provided on the testing platform. The testing assembly includes a sliding plate slidably mounted on the testing platform. A fixed plate is provided on the side of the sliding plate closer to the dynamic torque detector, and a movable plate is provided on the side of the fixed plate away from the dynamic torque detector. Both the fixed plate and the movable plate have through holes for fixing the sleeve-type axial force sensor. This utility model improves the structure of existing torque detectors, effectively incorporating the sleeve-type axial force sensor into the testing assembly, thereby achieving simultaneous detection of torque and preload, thus saving a significant amount of assembly time and improving testing efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of testing equipment, and in particular relates to a bolt preload calibration force measuring instrument. Background Technology

[0002] Bolt preload refers to the clamping force applied to the connected parts (such as flanges and steel plates) by the elastic deformation of the bolt caused by external force (such as torque or tension) when the bolt is tightened. Bolt preload is crucial for ensuring the reliability of the connection; bolted connections without sufficient preload will almost certainly fail. Therefore, it is necessary to test the bolt preload.

[0003] The existing bolt preload is mainly detected by a bolt preload calibration force measuring instrument, which is mainly detected by an axial force sensor. During the test, the bolt is passed through a sleeve-type axial force sensor, then a nut is put on and tightened. This compresses the strain gauge inside the axial force sensor, and the strain gauge will change its resistance as it deforms. The signal conditioning circuit converts the resistance change into an axial force value and directly outputs the preload data.

[0004] However, determining the preload of a bolt also requires testing its torque. The essential function of a bolt is to tightly "clamp" the connected components (such as flanges, gears, and steel structures) by converting torque into preload, resisting external loads (vibration, impact, and tension). The core purpose of torque testing is to ensure that the preload is within the "design safety range" to avoid two extreme failures.

[0005] Since bolt torque detection requires a dynamic torque sensor, it is implemented by fitting a sleeve onto the nut, and then clamping other connecting parts with the bolt and nut to achieve detection.

[0006] Since both preload and torque testing are routine bolt inspections, combining them for simultaneous testing is a problem that needs to be solved. Utility Model Content

[0007] This invention addresses the technical problem of simultaneously detecting bolt preload and torque by proposing a bolt preload calibration force measuring instrument that is reasonably designed, simple in structure, easy to manufacture, and capable of simultaneously detecting bolt preload and torque.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides a bolt preload calibration force measuring instrument, including a testing platform and a sleeve-type axial force sensor. A testing motor is provided on the testing platform, and the output end of the testing motor is connected to a dynamic torque detector. A nut sleeve can be inserted and connected to the output end of the dynamic torque detector. A testing component is also provided on the testing platform. The testing component includes a sliding plate slidably disposed on the testing platform. A fixed plate is provided on the side of the sliding plate close to the dynamic torque detector, and a movable plate is provided on the side of the fixed plate away from the dynamic torque detector. The movable plate can be slidably fixed on the sliding plate. Both the fixed plate and the movable plate are provided with through holes for fixing the sleeve-type axial force sensor. A locking plate is also provided on the side of the movable plate away from the fixed plate. The locking plate is slidably disposed on the sliding plate, and a sleeve tube is provided on the locking plate. A bolt sleeve can be inserted and connected to the sleeve tube.

[0009] Preferably, the sleeve-type axial force sensor is provided with gaskets at both ends, and the gaskets are placed inside the through hole.

[0010] Preferably, the fixing plate is detachably mounted on the sliding plate.

[0011] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0012] This utility model provides a bolt preload calibration force measuring instrument. By improving the structure of the existing torque detector, a sleeve-type axial force sensor is effectively added to the detection component, thereby realizing the simultaneous detection of torque and preload, thus saving a lot of assembly time and improving detection efficiency. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the bolt preload calibration force measuring instrument provided in Example 1;

[0015] Figure 2 This is a structural schematic diagram of the bolt preload calibration force measuring instrument provided in Example 1 from another angle;

[0016] Figure 3 This is a front view of the bolt preload calibration force measuring instrument provided in Example 1;

[0017] In the above figures, 1. Testing platform; 2. Testing motor; 3. Dynamic torque tester; 4. Nut sleeve; 5. Testing component; 51. Sliding plate; 511. Fixing slot; 52. Fixing plate; 53. Movable plate; 54. Locking plate; 55. Sleeve tube; 6. Sleeve-type axial force sensor; 7. Gasket; 8. Bolt sleeve. Detailed Implementation

[0018] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0019] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0020] Example 1, such as Figures 1-3 As shown, this embodiment aims to provide a device capable of simultaneously detecting bolt preload and torque. Considering that existing preload detection devices are relatively simple to install, while torque detection is more complicated, the bolt preload calibration force measuring instrument provided in this embodiment is an improvement on existing torque detection equipment. Specifically, the bolt preload calibration force measuring instrument provided in this embodiment includes a testing platform 1 and a sleeve-type axial force sensor 6. Of course, a control circuit board and a display are provided on the testing platform 1. Since this embodiment does not involve any improvements to these components, they will not be described in detail in this embodiment.

[0021] A detection motor 2 is provided on the detection table 1. The output end of the detection motor 2 is connected to a dynamic torque detector 3. The output end of the dynamic torque detector 3 can be plugged into and connected to a nut sleeve 4. A detection component 5 is also provided on the detection table 1. The detection component 5 includes a sliding plate 51 that is slidably disposed on the detection table 1. In this embodiment, a guide rail is provided on the detection table 1, and sliders are provided on both sides of the bottom of the sliding plate 51. The sliding plate 51 is slidably disposed on the sliding plate 51 by the sliders.

[0022] The above structure and positional relationships are common structures of existing torque detection devices (except for the sleeve-type axial force sensor 6), therefore, they will not be described in detail in this embodiment.

[0023] In order to apply the sleeve-type axial force sensor 6 to the detection assembly 5, in this embodiment, a fixed plate 52 is provided on the side of the sliding plate 51 close to the dynamic torque detector 3. The fixed plate 52 is vertically arranged on the sliding plate 51. A movable plate 53 is provided on the side of the fixed plate 52 away from the dynamic torque detector 3. The movable plate 53 is slidably fixed on the sliding plate 51. Specifically, a fixing slot 511 is provided on the sliding plate 51, and a threaded hole is provided at the bottom of the movable plate 53. In this way, the movable plate 53 can be slidably fixed on the sliding plate 51 by bolt locking.

[0024] The sliding fixation of the movable plate 53 is for the convenience of installing the sleeve-type axial force sensor 6. Since the sleeve-type axial force sensor 6 is cylindrical in shape, through holes for fixing the sleeve-type axial force sensor 6 are provided on both the fixed plate 52 and the movable plate 53 to facilitate its installation. In this way, one end of the sleeve-type axial force sensor 6 is inserted into the through hole of the fixed plate 52, and the other end is inserted into the through hole of the movable plate 53. The sleeve-type axial force sensor 6 is fitted with the through hole with a clearance fit. It is not necessary to fix the sleeve-type axial force sensor 6 tightly; it is only necessary to maintain its position.

[0025] Considering the need to prevent the bolts from rotating during the testing process, in this embodiment, a locking plate 54 is also provided on the side of the movable plate 53 away from the fixed plate 52. For ease of assembly, a sliding plate 51 is slidably mounted on the locking plate 54, and the movement of the locking plate 54 is the same as the sliding movement of the sliding plate 51. A sleeve tube 55 is provided on the locking plate 54. The sleeve tube 55 is cylindrical in shape and has a hexagonal hole for inserting the bolt sleeve 8. The bolt sleeve 8 can be inserted and connected to the sleeve tube 55.

[0026] In this way, when using it, first pass the bolt out of the sleeve-type axial force sensor 6, then put on the nut, and initially tighten it to make the nut close to the sleeve-type axial force sensor 6. Then, put the nut sleeve 4 on the nut and the bolt sleeve 8 on the bolt. Then, push the locking plate 54 to fix the bolt sleeve 8. Next, push the sliding plate 51 to insert the nut sleeve 4 into the hole of the dynamic torque detector 3. Then, connect the dynamic torque detector 3, the sleeve-type axial force sensor 6 and the connector of the circuit control board through the data cable. Finally, turn on the motor to obtain the relevant data of preload and torque.

[0027] To reduce the need for replacing the sleeve-type axial force sensor 6, in this embodiment, gaskets 7 are provided at both ends of the sleeve-type axial force sensor 6, and the gaskets 7 are placed inside the through holes. A hole for the bolt to pass through is provided in the middle of the gasket 7. The gasket 7 can be set tightly against the sleeve-type axial force sensor 6. Thus, by using a sleeve-type axial force sensor 6 with a large-diameter hole and gaskets 7 with different hole diameters, the detection of bolts of different specifications can be achieved. Similarly, using a sleeve to connect the bolt and nut serves the same purpose; since sleeves are readily available and mature hardware components, they are convenient to purchase and use.

[0028] To facilitate the replacement of the sleeve-type axial force sensor 6, in this embodiment, the fixing plate 52 is detachably mounted on the sliding plate 51. Specifically, the sliding plate 51 has holes, and the bottom of the fixing plate 52 has threaded holes, so that the fixing plate 52 can be detachably fixed by bolts.

[0029] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A bolt pre-tightening force calibration dynamometer, comprising a detection table and a sleeve type axial force sensor, a detection motor is arranged on the detection table, an output end of the detection motor is connected with a dynamic torque detector, an output end of the dynamic torque detector is plug-in connectable with a nut sleeve, and a detection assembly is further arranged on the detection table, the detection assembly comprises a sliding plate slidingly arranged on the detection table, characterized in that, A fixed plate is provided on the side of the sliding plate closer to the dynamic torque detector, and a movable plate is provided on the side of the fixed plate away from the dynamic torque detector. The movable plate can be slidably fixed on the sliding plate. Both the fixed plate and the movable plate are provided with through holes for fixing the sleeve-type axial force sensor. A locking plate is also provided on the side of the movable plate away from the fixed plate. The locking plate is slidably mounted on the sliding plate and is provided with a sleeve tube. A bolt sleeve can be inserted and connected to the sleeve tube.

2. The bolt preload calibration and force measuring instrument according to claim 1, characterized in that, The sleeve-type axial force sensor is also provided with gaskets at both ends, and the gaskets are placed in the through hole.

3. The bolt preload calibration and force measuring instrument according to claim 2, characterized in that, The fixing plate is detachably mounted on the sliding plate.

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