Dynamic dynamometer for calibration

Abstract

The invention relates to the technical field of dynamic force, standard dynamometers, fatigue tests and the like, and provides a dynamic dynamometer for calibration. The dynamic dynamometer comprises a force transducer, a connecting tool, an acquisition system and an upper computer. The force cell sensor comprises a TEDS self-identification joint used for storing characteristic data of the force cell sensor, and the characteristic data of the force cell sensor is used for adapting to the plurality of force cell sensors; the force measuring sensor is connected to a force loading chain of the testing machine through the connecting tool; the acquisition system acquires measurement output data of the force sensors, acquires characteristic data of the force sensors, and identifies different force sensors according to the characteristic data of the force sensors; the upper computer obtains measurement output data of the force measurement sensor and records, processes and calculates the measurement output data, so that the space and time for mounting the reaction frame are saved, different sensors connected with the same channel are automatically recognized, the number of the sensors is not limited, the sampling frequency is high, data acquisition, recording and calculation are automatically performed, more time is saved, and the efficiency is improved. Convenience and rapidness are realized.

Description

Technical Field

[0001] The invention relates to the technical fields of dynamic force, standard dynamometer, fatigue test and the like, and in particular to a dynamic dynamometer for calibration. Background Art

[0002] Dynamometer, also known as force gauge, is a portable measuring instrument used to measure various force values ​​or loads. There are various classifications of dynamometers, which are divided into working dynamometers and standard dynamometers according to the objects of use. Among them, among the standard dynamometers, the standard dynamometers used for the calibration or comparison of deadweight, lever, hydraulic and superposition dynamometers are mostly force sensor type. Various forms of force sensors are equipped with appropriate electrical measuring instruments to form sensor type dynamometers or electronic dynamometers. At present, standard dynamometers are still dominated by resistance strain sensors with wide range, high accuracy and strong adaptability. Resistance strain sensors are compression sensors, usually equipped with spherical pressure heads to prevent eccentric loading and loading on different axes. The compression sensor is used with a digital display instrument for data acquisition, and the collected data is recorded manually or with other software. At the same time, through the instrument selection channel of the digital display instrument, compression sensors of different ranges can be adapted. However, the compression sensor needs to be used with a reaction frame to complete the tensile measurement, the installation space is easily limited, and it is not suitable for acquisitions above 50Hz. After the data set is collected, additional supporting software is required to calculate the relevant indicators, or manual calculations are required, and coaxiality related measurements and data processing are not included. In addition, the digital display instrument has limited channels, and the number of compression sensors is limited.

[0003] In summary, the existing dynamometer technology has the following technical problems: it needs to be equipped with a reaction frame to complete the tensile measurement, the installation space is easily limited, it is not suitable for acquisition above 50Hz, additional supporting software is required to calculate the relevant indicators after the data set is collected, or manual calculation is required, it does not contain coaxiality related measurement and data processing, the digital display instrument has limited channels, and the number of compressive sensors is limited. Summary of the invention

[0004] The purpose of the present invention is to solve the deficiencies in the prior art to at least a certain extent, and to provide a dynamic dynamometer for calibration to save space and time for installing a reaction frame, self-identify different sensors connected to the same channel, have no limit on the number of sensors, have a high sampling frequency, automatically collect, record and calculate data, save time, be convenient and quick, support coaxiality-related data collection, recording and calculation functions, and have a high degree of integration.

[0005] The dynamic dynamometer for calibration provided by the present invention comprises:

[0006] A force sensor is used to measure the dynamic load generated during the loading process of the testing machine; the force sensor includes a TEDS self-identification connector, the TEDS self-identification connector is used to store characteristic data of the force sensor, and the characteristic data of the force sensor is used to adapt to multiple force sensors;

[0007] A connecting tool is connected to the force sensor, and the force sensor is connected to the force loading chain of the testing machine;

[0008] an acquisition system connected to and communicating with the force sensor, for acquiring measurement output data of the force sensor, acquiring characteristic data of the force sensor, and identifying different force sensors according to the characteristic data of the force sensor;

[0009] The host computer is connected to the acquisition system for communication, and is used to obtain the measurement output data of the force sensor, and to record, process and calculate the measurement output data.

[0010] Furthermore, the force sensor characteristic data includes sensor sensitivity data and sensor calibration data.

[0011] Furthermore, the force sensor adopts a standard sensor or a sample patch sensor.

[0012] Furthermore, the standard sensor used by the force sensor includes a sensor body and a tooling connection end; the tooling connection end is located at an end in the axial direction of the sensor body and is used to adapt and connect to different connecting tools.

[0013] Furthermore, when the tooling connection end is connected to the connecting tooling, a threaded connection is adopted, the thread adopts 4-grade precision, the rear end of the thread adopts a step fit, and a nut is used for tightening.

[0014] Furthermore, the connecting tooling includes a round rod adapter, which is used for a testing machine equipped with a rod clamping jaw, and the size of the round rod adapter is designed according to the clamping range and force value of the rod clamping jaw.

[0015] Furthermore, the connecting tool includes a threaded adapter, which is used for a testing machine equipped with a threaded fixture, and threads are arranged at both ends of the threaded adapter.

[0016] Furthermore, the connecting tooling includes a pressure cap type adapter assembly, which includes a pressure cap, a limit ring and a spherical pressure head; the spherical pressure head is connected to the tooling connection end of the force sensor through a thread, and the spherical pressure head is provided with an assembly groove, the limit ring is installed in the assembly groove, and the pressure cap is sleeved on the spherical pressure head after the limit ring is installed.

[0017] Furthermore, the limiting ring is a rubber ring.

[0018] Furthermore, the acquisition system includes a force channel and multiple expansion sub-cards; the force channel identifies different force sensors according to the characteristic data of the force sensors; the multiple expansion sub-cards adopt a modular design, and the modular design supports independent installation and removal of the multiple expansion sub-cards.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The dynamic force gauge for calibration provided by the present invention comprises a force sensor, a connection tool, a collection system and a host computer. The force sensor is used to measure the dynamic load generated during the loading process of the test machine; the force sensor comprises a TEDS self-identification joint, the TEDS self-identification joint is used to store the characteristic data of the force sensor, and the characteristic data of the force sensor is used to adapt to multiple force sensors; the connection tool is connected to the force sensor, and the force sensor is connected to the force loading chain of the test machine; the collection system is connected and communicated with the force sensor, and is used to obtain the measurement output data of the force sensor, and obtain the characteristic data of the force sensor, and identify different force sensors according to the characteristic data of the force sensor; the host computer is connected and communicated with the collection system, and is used to obtain the measurement output data of the force sensor, and record, process and calculate the measurement output data, so as to save space and time for installing the reaction frame, self-identify different sensors connected to the same channel, the number of sensors is not limited, the sampling frequency is high, and data collection, recording and calculation are automatically performed, which is more time-saving, convenient and fast, supports the coaxiality-related data collection, recording and calculation functions, and has a high degree of integration. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative labor.

[0022] Figure 1 It is a schematic diagram of a system structure in which a dynamic dynamometer used for calibration is connected to a testing machine in an embodiment of the present invention;

[0023] Figure 2 It is a structural schematic diagram of the connection between the force sensor and the connecting tooling according to an embodiment of the present invention;

[0024] Figure 3 It is a structural schematic diagram of a connection tooling of a force sensor and a round rod adapter according to an embodiment of the present invention;

[0025] Figure 4 It is a structural schematic diagram of a connection between a force sensor and a connecting tool of a threaded adapter according to an embodiment of the present invention;

[0026] Figure 5 It is a structural schematic diagram of the connection between the force sensor and the connection tooling of the cap-type adapter assembly according to the embodiment of the present invention;

[0027] Figure 6 It is a structural schematic diagram showing in detail the sensor body after the force sensor according to the embodiment of the present invention is connected to the connecting tool;

[0028] Figure 7 It is a structural schematic diagram of a collection system according to an embodiment of the present invention;

[0029] Figure 8 This is a schematic diagram of the structure of a backplane of a collection system according to an embodiment of the present invention;

[0030] Fig. 9 It is a structural schematic diagram of a host computer according to an embodiment of the present invention.

[0031] Description of reference numerals:

[0032] 1. Force sensor; 10. Sensor body; 100. Connecting rod; 101. Connecting nut; 102. Elastic body; 103. Connecting screw; 104. Housing; 105. Cable connector; 106. Diaphragm; 11. Tooling connection end;

[0033] 2. Connecting tool; 20. Round rod adapter; 21. Threaded adapter; 22. Pressing cap adapter assembly; 220. Pressing cap; 221. Limiting ring; 222. Spherical pressing head;

[0034] 3. Acquisition system; 30. Force value channel; 31. Expansion daughter card;

[0035] 4. Host computer. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar methods or methods having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but are not to be construed as limiting the present invention. All other embodiments obtained by ordinary technicians in the field without creative work based on the embodiments of the present invention are within the scope of protection of the present invention.

[0037] See also Figure 1-Figure 9 , a dynamic force measuring instrument for calibration provided by an embodiment of the present invention comprises:

[0038] A force sensor 1 is used to measure the dynamic load generated during the loading process of the testing machine; the force sensor 1 includes a TEDS self-identification connector, the TEDS self-identification connector is used to store characteristic data of the force sensor 1, and the characteristic data of the force sensor 1 is used to adapt to multiple force sensors 1;

[0039] A connecting tool 2 is connected to the force sensor 1, and the force sensor 1 is connected to the force loading chain of the testing machine;

[0040] An acquisition system 3 is connected to the force sensor 1 for communication, and is used to obtain measurement output data of the force sensor 1 and characteristic data of the force sensor 1, and identify different force sensors 1 according to the characteristic data of the force sensor 1;

[0041] The host computer 4 is connected to the acquisition system 3 for communication, and is used to obtain the measurement output data of the force sensor 1, and to record, process and calculate the measurement output data.

[0042] It should be noted that, in this embodiment, the force sensor 1 is suitable for measuring dynamic loads, and is directly connected to the force loading chain of the testing machine through the connecting fixture 2, without the need for a reaction frame. Therefore, the tensile measurement no longer relies on the reaction frame, eliminating the need for additional installation space. In addition, the dynamic force sensor 1 performs data acquisition, obtains data in real time through the acquisition system 3, and automatically records, processes and calculates the data through the upper computer 4 software, thereby reducing the process of manually recording data and manually calculating indicators, improving the efficiency of data processing, and avoiding errors in manual operation.

[0043] It should be noted that, in this embodiment, the characteristic data of the force sensor 1 is stored through the TEDS self-identification connector, so that the acquisition system 3 can automatically identify and adapt multiple force sensors 1. One acquisition system 3 can adapt to multiple sets of sensors, no longer limited by the number of channels of traditional digital display instruments, greatly reducing the number of display instruments, improving the compatibility of the equipment, and can adapt to force sensors 1 of different ranges and types. At the same time, it simplifies the process of sensor replacement and configuration, reduces the complexity of hardware, and reduces the overall cost of the system.

[0044] It should also be noted that the characteristic data of the force sensor 1 may include sensor sensitivity data and sensor calibration data, etc. The force sensor 1 may be a standard sensor or a sample patch sensor.

[0045] In some preferred embodiments, when the force sensor 1 adopts the standard sensor, the standard sensor may include a sensor body 10 and a tooling connection end 11; the tooling connection end 11 is located at an end in the axial direction of the sensor body 10, and is used to adapt and connect different connecting tools 2. Further, when the tooling connection end 11 is connected to the connecting tool 2, a threaded connection is adopted, the thread adopts a 4th-grade precision, the rear end of the thread adopts a step fit, and a nut is used for tightening. It should be noted that the thread adopts a 4th-grade precision during the threaded connection, which can reduce the thread gap; the rear end of the thread adopts a step fit, and a nut is used for tightening, which can ensure coaxial assembly and eliminate gaps.

[0046] In some preferred embodiments, the connecting tool 2 includes a round rod adapter 20, and the round rod adapter 20 is used for a testing machine equipped with a rod clamping jaw, and the size of the round rod adapter 20 is designed according to the clamping range and force value of the rod clamping jaw. It should be noted that the round rod adapter 20 is easy and quick to install, and can be used for pulling / pressing in both directions. A small clamping force may cause slipping and loss of force. Therefore, the clamping of the rod clamping jaw needs to have a certain pressure, which usually causes partial damage to the clamped parts. For damage caused by repeated use, it is only necessary to simply replace the round rod adapter 20 to restore normal use, which greatly reduces the cost and cycle of repairing or reproducing the sensor.

[0047] In some preferred embodiments, the connection tool 2 includes a thread adapter 21, which is used for a testing machine equipped with a threaded fixture, and threads are arranged at both ends of the thread adapter 21. It should be noted that the thread adapter 21 is suitable for equipment equipped with a threaded fixture, and the two ends are connected by threads (pay attention to eliminate the gap), and can be used for pulling / pressing in both directions.

[0048] In some preferred embodiments, the connecting tool 2 includes a pressure cap type adapter assembly 22, and the pressure cap type adapter assembly 22 includes a pressure cap 220, a limiting ring 221 and a spherical pressure head 222; the spherical pressure head 222 is connected to the tool connection end 11 of the force sensor 1 through a thread, and the spherical pressure head 222 is provided with an assembly groove, and the limiting ring 221 is installed in the assembly groove, and the pressure cap 220 is sleeved with the spherical pressure head 222 after the limiting ring 221 is installed. Preferably, the limiting ring 221 is a rubber ring. It should be noted that the limiting ring 221 (such as a rubber ring) can provide damping and constraint between the pressure cap 220 and the spherical pressure head 222, so that the pressure cap 220 will not fall off easily, and can be flexibly adjusted to ensure the center position of the loading force processing.

[0049] In some preferred embodiments, the acquisition system 3 includes a force channel 30 and multiple expansion sub-cards 31; the force channel identifies different force sensors 1 according to the characteristic data of the force sensor 1; the multiple expansion sub-cards adopt a modular design, and the modular design supports independent installation and removal of the multiple expansion sub-cards. It should be noted that in this embodiment, the relevant expansion sub-cards can be installed and removed independently, which is convenient for maintenance and expansion. The force channel has a self-identification function, and each sensor is equipped with a TEDS head. The sensitivity, calibration coefficient, etc. of the sensor are stored in the connector chip, and the acquisition system 3 can be connected to identify it, thereby solving the traditional problem of adapting multiple sensors by increasing the number of channels.

[0050] In some further preferred embodiments, the sensor body 10 includes a connecting rod 100, a connecting nut 101, an elastomer 102, a connecting screw 103, a shell 104, a cable connector 105 and a diaphragm 106; the upper end of the shell 104 is fixed to the elastomer 102 by the connecting screw 103, and the lower end is connected to the elastomer 102 by welding the diaphragm 106, and the cable connector 105 is fixed to the shell 104; the connecting rod 100 is connected to the elastomer 102 through 4-level thread accuracy, and is positioned by the positioning step on the inner side of the elastomer 102 to ensure that the connecting rod 100 meets the coaxial requirements; the connecting nut 101 is sleeved on the connecting rod 100 and is close to the end face of the elastomer 102; the connecting rod 100 is connected to the testing machine. It should be noted that, in this embodiment, the upper end of the housing 104 is fixed to the elastic body 102 by a connecting screw 103, and the lower end is connected to the elastic body 102 by a welding diaphragm 106, which improves the rigidity in the horizontal direction and has high flexibility in the measurement direction, so as to generate a horizontal force component during the measurement process and play a sealing role at the same time. In addition, the cable connector 105 is fixed to the housing 104 and is detachable for easy welding. In addition, the connecting rod 100 is connected to the elastic body 102 through a 4-level thread accuracy, and is positioned with a step to ensure the coaxial requirement. The connecting nut 101 is sleeved on the connecting rod 100 and is close to the end face of the elastic body 102, which can eliminate the connection gap between the connecting rod 100 and the elastic body 102.

[0051] It should be noted that in the above embodiments of the present invention, the dynamic dynamometer used for calibration can save space and time for installing the reaction frame by being equipped with a connecting tool 2 with good coaxiality, convenient installation and wide application range. In addition, the dynamic dynamometer used for calibration has a TEDS self-identification function. Different sensors can be connected to the same channel to identify relevant calibration parameters for measurement, and the number of sensors is not limited. The sampling frequency of the acquisition system 3 reaches 15kHz, which meets the 300Hz cyclic force acquisition; including peak value, valley value, range, waveform, etc. In addition, the dynamic dynamometer used for calibration also includes relevant data acquisition, recording and calculation functions, which is more time-saving, convenient and fast. In addition, the dynamic dynamometer used for calibration has the functions of coaxiality-related data acquisition, recording and calculation. It has high integration for JJG 556 inspection items.

[0052] It should also be noted that fatigue testing plays a vital role in evaluating the performance degradation and fatigue life of materials, ensuring the reliability, safety and durability of products. It helps to ensure the safety and reliability of products, thereby protecting users from potential safety risks. It is particularly important in modern industry, aerospace, automotive engineering and other fields. Therefore, a dynamic dynamometer for calibration is needed to verify the cyclic force of the fatigue testing machine.

[0053] The above is a description of the technical solution provided by the present invention. For those skilled in the art, according to the ideas of the embodiments of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A dynamic dynamometer for calibration, characterized in that: include: A force sensor is used to measure the dynamic load generated during the loading process of the testing machine; the force sensor includes a TEDS self-identification connector, the TEDS self-identification connector is used to store characteristic data of the force sensor, and the characteristic data of the force sensor is used to adapt to multiple force sensors; A connecting tool is connected to the force sensor, and the force sensor is connected to the force loading chain of the testing machine; an acquisition system connected to and communicating with the force sensor, for acquiring measurement output data of the force sensor, acquiring characteristic data of the force sensor, and identifying different force sensors according to the characteristic data of the force sensor; The host computer is connected to the acquisition system for communication, and is used to obtain the measurement output data of the force sensor, and to record, process and calculate the measurement output data.

2. The dynamic dynamometer for calibration according to claim 1, characterized in that: The force sensor characteristic data includes sensor sensitivity data and sensor calibration data.

3. The dynamic dynamometer for calibration according to claim 1, characterized in that: The force sensor adopts a standard sensor or a sample patch sensor.

4. The dynamic dynamometer for calibration according to claim 3, characterized in that: The standard sensor used by the force sensor includes a sensor body and a tooling connection end; the tooling connection end is located at an end in the axial direction of the sensor body and is used to adapt and connect different connecting tools.

5. The dynamic dynamometer for calibration according to claim 4, characterized in that: When the tooling connection end is connected to the connecting tooling, a threaded connection is adopted, the thread adopts 4-grade precision, the rear end of the thread adopts a step fit, and a nut is used for tightening.

6. The dynamic dynamometer for calibration according to claim 4, characterized in that: The connecting tooling includes a round bar adapter, which is used for a testing machine equipped with a bar clamping jaw. The size of the round bar adapter is designed according to the clamping range and force value of the bar clamping jaw.

7. The dynamic dynamometer for calibration according to claim 4, characterized in that: The connecting tool comprises a thread adapter, which is used for a testing machine equipped with a thread fixture, and threads are arranged at both ends of the thread adapter.

8. The dynamic dynamometer for calibration according to claim 4, characterized in that: The connecting tooling includes a pressing cap type adapter assembly, which includes a pressing cap, a limiting ring and a spherical pressure head; the spherical pressure head is connected to the tooling connection end of the force sensor through a thread, and the spherical pressure head is provided with an assembly groove, the limiting ring is installed in the assembly groove, and the pressing cap is sleeved on the spherical pressure head after the limiting ring is installed.

9. The dynamic dynamometer for calibration according to claim 8, characterized in that: The limiting ring is a rubber ring.

10. The dynamic dynamometer for calibration according to any one of claims 1 to 9, characterized in that: The acquisition system includes a force channel and multiple expansion sub-cards; the force channel identifies different force sensors according to the characteristic data of the force sensors; the multiple expansion sub-cards adopt a modular design, and the modular design supports independent installation and removal of the multiple expansion sub-cards.

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