Counter-force device for calibrating pneumatic and electric wrenches

Abstract

The utility model discloses a counter-force device for calibrating pneumatic and electric wrenches, and belongs to the technical field of wrench calibration. The device comprises a base, an upper table top is arranged above the base, a protective jacket is arranged between the upper table top and the base and extends to the top of the upper table top, a positioning seat is arranged at the upper end of the protective jacket, a positioning disc is arranged above the positioning seat, and a sensor is arranged at the bottom of the positioning disc. An upper simulator base is arranged on the top surface of the upper table top, a plurality of spanner handle supports are arranged on the two sides of the top surface of the upper table top, and stop levers are arranged on the spanner handle supports; according to the utility model, on the basis of the adaptive design of a plurality of groups of mounting hole sites, the telescopic stop lever and the universal adapter of the upper simulator base, the device can be compatible with pneumatic / electric wrenches with different torque specifications and can be simultaneously adaptive to simulators with various models, equipment or core accessories do not need to be frequently replaced, the equipment investment and operation complexity of calibration operation are greatly reduced, and the calibration efficiency is improved. The method is suitable for calibration requirements of multiple scenes such as industrial manufacturing and mechanical maintenance.

Description

Technical Field

[0001] This utility model relates to the field of wrench calibration technology, and more specifically, to a reaction force device for calibrating pneumatic and electric wrenches. Background Technology

[0002] In industrial manufacturing and machinery assembly, pneumatic and electric wrenches are widely used in bolt tightening operations due to their efficient torque output capabilities. The accuracy of their torque output directly affects the reliability and safety of equipment assembly; therefore, regular torque calibration of pneumatic and electric wrenches is necessary.

[0003] Currently, reaction force devices used for calibrating pneumatic and electric wrenches have several shortcomings: First, they lack adaptability. Existing devices are difficult to use with wrenches of different torque specifications and various simulator models, requiring frequent replacement of equipment or accessories for different calibration targets, increasing calibration costs and operational complexity. Second, they lack structural stability. The support structure of some devices is simply designed, and during calibration, vibration or displacement can easily occur due to the torque reaction force of the wrench, affecting the measurement accuracy of the torque sensor and failing to meet the requirements of high-precision calibration. Third, they lack protective performance. Key components such as the adapter components between the sensor and the simulator / wrench lack effective protection. Long-term exposure makes them susceptible to dust, oil, or external impact, which not only reduces the service life of the components but may also introduce additional errors due to component wear. Fourth, they are inconvenient to install and adjust. The means of adjusting the device's level are limited, and deviations in the levelness of the base directly affect the accuracy of torque measurement. The adjustment accuracy and ease of operation of existing adjustable support structures are insufficient to meet the stringent requirements of calibration scenarios.

[0004] In view of the aforementioned technological status, there is an urgent need for a reaction force device for calibrating pneumatic and electric wrenches that is highly adaptable, structurally stable, reliably protected, and easy to install and adjust. This would solve the problems of poor adaptability, insufficient accuracy, lack of protection, and inconvenient adjustment in existing technologies, and ensure the efficiency and accuracy of pneumatic and electric wrench calibration. Therefore, we propose a reaction force device for calibrating pneumatic and electric wrenches. Utility Model Content

[0005] The purpose of this invention is to provide a reaction force device for calibrating pneumatic and electric wrenches to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A reaction force device for calibrating pneumatic and electric wrenches includes a base, an upper platform above the base, a protective cover between the upper platform and the base, the protective cover extending to the top of the upper platform, a positioning seat at the upper end of the protective cover, a positioning disk above the positioning seat, and a sensor at the bottom of the positioning disk.

[0008] The top surface of the upper platform is equipped with an upper simulator base, and multiple wrench handle supports are provided on both sides of the top surface of the upper platform. The wrench handle supports are equipped with stop bars.

[0009] A support column is also provided at the bottom of the upper table near the edge, and the lower end of the support column is connected to the base.

[0010] Preferably, adjustable support wheels are provided at each of the four corners of the bottom of the base.

[0011] Preferably, the upper simulator base is provided with multiple mounting holes to accommodate simulators of different specifications.

[0012] Preferably, the sensor is a torque sensor with a range of 50Nm-500Nm and an accuracy class of not less than 0.1%.

[0013] Preferably, the protective jacket is a cylindrical structure, and its inner wall is adapted to the adapter assembly at the bottom of the sensor to protect the adapter assembly.

[0014] Preferably, the positioning disk has multiple positioning holes for positioning the top connection structure of the sensor.

[0015] Preferably, the stop bar is a telescopic structure, and its length can be adjusted according to the length of the wrench handle.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] (1) Based on the multiple mounting holes, telescopic stop bar and universal adapter design of the upper simulator base, this utility model can be compatible with pneumatic / electric wrenches of different torque specifications and can also be adapted to various models of simulators. It does not require frequent replacement of equipment or core components, greatly reducing the equipment investment and operational complexity of calibration operations. It is suitable for calibration needs in various scenarios such as industrial manufacturing and mechanical maintenance.

[0018] (2) The base and support column of this utility model form a high rigidity bearing frame, which can effectively disperse the reaction force generated by the wrench during the calibration process and avoid overall deformation or displacement of the device; the cooperation and fixing of the wrench handle support and the stop bar, and the coaxiality calibration of the positioning seat and the positioning plate further eliminate the interference caused by the wrench shaking and component eccentricity, ensuring accurate torque transmission path, and no vibration or relative displacement during the calibration process, laying a structural foundation for high-precision measurement.

[0019] (3) A torque sensor with an accuracy class of not less than 0.1% is used to realize high-precision acquisition and conversion of torque signals; the level of the device can be precisely adjusted by adjustable support wheels, and the protective cover protects key components, reducing the impact of horizontal deviation, external pollution and external force collision on the measurement, ensuring that the torque measurement value is true and reliable, and the calibration result meets the industrial-grade accuracy requirements. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0021] The following are the labels in the diagram: 1. Base; 2. Support column; 3. Upper platform; 4. Upper simulator base; 5. Stop bar; 6. Protective cover; 7. Positioning plate; 8. Sensor; 9. Positioning seat; 10. Adjustable support wheel; 11. Wrench handle support. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Example

[0023] Please see Figure 1 A reaction force device for calibrating pneumatic and electric wrenches includes a base 1, an upper platform 3 on top of the base 1, a protective cover 6 between the upper platform 3 and the base 1, the protective cover 6 extending to the top of the upper platform 3, a positioning seat 9 at the upper end of the protective cover 6, a positioning disk 7 above the positioning seat 9, and a sensor 8 at the bottom of the positioning disk 7. The positioning seat 9 is connected to the protective cover 6, and the positioning disk 7 is located on top of the sensor 8. The two work together to accurately position the sensor 8 and the connecting structure, ensuring the coaxiality of the sensor 8 with the simulator and the pneumatic / electric wrench, avoiding torque measurement errors caused by eccentricity, and significantly improving calibration accuracy.

[0024] The upper platform 3 has an upper simulator base 4 on its top surface; multiple wrench handle supports 11 are provided on both sides of the top surface of the upper platform 3, and each wrench handle support 11 has a stop bar 5; the stop bar 5 is a telescopic structure, and its length can be adjusted according to the length of the wrench handle. The wrench handle support 11 can stably support the wrench handle, and the stop bar 5, through its telescopic design, can adapt to wrenches of different lengths. The two work together to fix the spatial position of the wrench, prevent the wrench from shaking during calibration, ensure the stability of torque transmission, and enhance the device's compatibility with different wrench models.

[0025] A support column 2 is also provided at the bottom edge of the upper platform 3, and the lower end of the support column 2 is connected to the base 1. The support column 2 connects the base 1 and the upper platform 3, providing high rigidity support, which can disperse the reaction force during the calibration process, avoid relative deformation between the upper platform 3 and the base 1, ensure the overall structural strength of the device, and further improve the stability of the calibration process.

[0026] In this application, adjustable support wheels 10 are provided at the four corners of the bottom of the base 1. The adjustable support wheels 10 are located at the four corners of the bottom of the base, which not only facilitates the adjustment of the level of the device and eliminates the measurement error caused by the level deviation, but also makes it easy to move and position the device, thereby improving the convenience of the device installation, debugging and use.

[0027] In this application, the upper simulator base 4 is provided with multiple mounting holes to adapt to simulators of different specifications, so that the device can be compatible with the calibration needs of pneumatic / electric wrenches with a variety of torque ranges, without the need for frequent replacement of equipment or accessories, thereby reducing calibration costs and improving operating efficiency.

[0028] In this application, sensor 8 is a torque sensor with a range of 50Nm-500Nm and an accuracy class of not less than 0.1%; it can realize high-precision real-time acquisition of torque, providing accurate and reliable numerical basis for the calibration of pneumatic / electric wrenches, and meeting the strict requirements of industrial scenarios for calibration accuracy.

[0029] In this application, the protective jacket 6 has a cylindrical structure, and its inner wall is adapted to the adapter assembly at the bottom of the sensor 8 to protect the adapter assembly. The protective jacket 6 also has a connection cable outlet hole for the sensor connection cable to pass through. The protective jacket 6 has a cylindrical structure and extends to the top of the upper platform 3, which can form a sealed protection for key components such as the adapter assembly at the bottom of the sensor 8, blocking dust, oil stains, and external impacts, extending the service life of the components, reducing external interference, and ensuring the measurement accuracy of the sensor.

[0030] In this application, the positioning disk 7 is provided with multiple positioning holes for positioning the top connection structure of the sensor 8.

[0031] In one possible embodiment, when the torque is large, a stable weight can be placed on the top blank space of the base 1 to increase its own weight, thereby completing the calibration and improving safety.

[0032] The specific work process for this application is as follows:

[0033] I. Preparations before calibration: Positioning and leveling

[0034] Choose a flat surface with suitable friction as the installation area, place the device in that location, and ensure that the length of the pneumatic / electric wrench to be calibrated meets the connection requirements with the tooling (both ends of the wrench can be effectively matched with the adapter and handle support respectively).

[0035] Rotate the four adjustable support wheels 10 at the bottom of the base 1 to lift the entire fixture. With the assistance of a level, adjust the four support wheels to be at the same height so that the whole device is in a horizontal state, thus eliminating the influence of horizontal deviation on torque measurement.

[0036] II. Standard Selection: Precise Fit

[0037] Select a simulator with the corresponding torque specification (large / medium / small) based on the torque of the wrench to be calibrated, ensuring that the simulator's torque capacity range matches the wrench's output torque.

[0038] Select a high- or low-magnification simulator based on the rotational speed of the wrench to be calibrated to ensure the stability and accuracy of torque transmission during the measurement process.

[0039] Based on the torque of the wrench, select a standard torque sensor with a range of 50Nm-500Nm and an accuracy class of ≥0.1% to ensure that the sensor's range covers the rated torque range of the wrench and that its accuracy meets the calibration requirements.

[0040] III. Connection of Standards and Fixtures: Installation Methods

[0041] (a) Installation on the countertop

[0042] Secure the selected simulator base to the upper platform 3 of the device with bolts, ensuring a firm and secure installation.

[0043] Take the appropriate adapter and connect the simulator and the standard torque sensor in series, then tighten the bolts at the connection point; then connect the sensor's connection cable directly to the signal interface of the matching display.

[0044] Again, using an adapter, connect the pneumatic / electric wrench to be calibrated in series with the end of the standard torque sensor furthest from the simulator, ensuring a tight connection and good coaxiality.

[0045] According to the torque output direction of the wrench, place the wrench handle steadily on the wrench handle support 11, ensuring that the handle and the support fit tightly without any suspension or shaking.

[0046] (ii) Installation of the lower countertop

[0047] Secure the selected simulator base to the lower platform of the device with bolts, ensuring that the installation position is centered and corresponds to the sensor installation area.

[0048] Take the appropriate adapter and connect the simulator and the standard torque sensor in series, tightening the bolts at the connection point; pull the sensor's connecting cable out from the middle connecting cable outlet of the base, and then connect it to the signal interface of the matching display, avoiding tangling or pressure on the connecting cable.

[0049] Connect the pneumatic / electric wrench to be calibrated in series with the end of the torque sensor furthest from the simulator using an adapter to ensure a tight connection and good coaxiality.

[0050] According to the torque output direction of the wrench, place the wrench handle steadily on the wrench handle support 11, ensuring that the handle and the support fit tightly.

[0051] Cover the top cover to completely cover the connection structure area of ​​the lower platform, preventing the connection parts from becoming loose during calibration and avoiding inaccurate measurement results or measurement failure.

[0052] IV. Calibration Process: Step-by-Step Testing and Precise Calibration

[0053] Loosen the fixing screws inside the simulator with a tool, adjust the rotation damping of the simulator, and ensure that the wrench to be calibrated can rotate for a sufficient number of measurement revolutions after starting (at least 3-5 revolutions of continuous rotation are required).

[0054] Start the wrench to be calibrated, apply 20% of the rated torque for a pre-torque test, and observe whether the device shakes or shifts. If there is shaking, change to a surface with greater friction or adjust the device's fixing method until there is no obvious shaking.

[0055] Gradually increase the output torque of the wrench in increments of 20% of the rated torque value (40%, 60%, 80%, and 100% of the rated torque value in sequence). After each torque value stabilizes, hold it for 3-5 seconds to ensure that the sensor fully collects torque data.

[0056] During the calibration process, the standard torque sensor will collect the physical torque signal in real time and convert it into an electrical signal, which will be transmitted to the display. The display will then show the real-time torque measurement value.

[0057] The operator compares the torque measurement values ​​of each level displayed on the monitor with the standard torque value of the wrench to be calibrated one by one to determine whether the torque output accuracy of the wrench meets the preset standard. If there is a deviation, the torque adjustment mechanism of the wrench is adjusted according to the measurement data. After adjustment, the above pre-torque and graded test steps are repeated until the torque output accuracy of the wrench meets the calibration requirements, and the calibration is completed.

[0058] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A reaction force device for calibrating pneumatic or electric wrenches, characterized in that, Includes a base (1), an upper platform (3) is provided above the base (1), a protective cover (6) is provided between the upper platform (3) and the base (1), the protective cover (6) extends to the top of the upper platform (3), a positioning seat (9) is provided at the upper end of the protective cover (6), a positioning disk (7) is provided above the positioning seat (9), and a sensor (8) is provided at the bottom of the positioning disk (7). The upper platform (3) is provided with an upper simulator base (4) on its top surface. The upper simulator base (4) is provided with multiple mounting holes for adapting simulators of different specifications. Multiple wrench handle supports (11) are provided on both sides of the top surface of the upper platform (3). A stop bar (5) is provided on the wrench handle support (11). The bottom of the upper platform (3) near the edge is also provided with a support column (2), and the lower end of the support column (2) is connected to the base (1).

2. The reaction force device for calibrating a pneumatic or electric wrench according to claim 1, characterized in that: The base (1) is equipped with adjustable support wheels (10) at the four corners of its bottom.

3. The reaction force device for calibrating a pneumatic or electric wrench according to claim 1, characterized in that: The sensor (8) is a torque sensor with a range of 50Nm-500Nm and an accuracy class of not less than 0.1%.

4. The reaction force device for calibrating pneumatic and electric wrenches according to claim 1, characterized in that: The protective jacket (6) is a cylindrical structure, and its inner wall is adapted to the adapter assembly at the bottom of the sensor (8) to protect the adapter assembly.

5. The reaction force device for calibrating a pneumatic or electric wrench according to claim 1, characterized in that: The positioning disk (7) is provided with multiple positioning holes for positioning the top connection structure of the sensor (8).

6. The reaction force device for calibrating a pneumatic or electric wrench according to claim 1, characterized in that: The stop bar (5) is a telescopic structure, and its length is adjustable according to the length of the wrench handle.

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