Force standard machine with sensor centering device

Abstract

A force standard machine with a sensor centering device is characterized in that the sensor centering device is arranged above a working table of the force standard machine, and the sensor centering device comprises an execution mechanism and a control mechanism; the actuating mechanism is used for pushing a tested sensor on the working table to move, and comprises four electric push rods which are all mounted on the working table through screws, are respectively positioned on the outer circumference of the tested sensor and are arranged at equal intervals, and the movement direction of each electric push rod points to the center of the working table; the control mechanism is used for measuring the offset of the sensors and comprises four laser distance measuring sensors and a controller connected with all parts of the control mechanism. The controller is further electrically connected with all parts of the executing mechanism. The automatic centering device is simple in structure and rapid in installation, can realize automatic centering of the sensor on the force standard machine, reduces manual centering errors, and improves centering accuracy, thereby ensuring accurate measurement value of the measured sensor.

Description

Technical Field

[0001] The utility model belongs to the technical field of force measuring machines, in particular to a force standard machine with a sensor centering device. Background Art

[0002] A large number of domestic metrology and testing institutions use force standard machines to test force sensors. The centering of sensors is mostly achieved by manual measurement of deviations, manual calculations, and manual adjustments. However, this method itself has human errors and certain safety hazards, especially for high-precision sensors, which are mostly heavy. When adjusting the position, most testers use methods such as pushing, pulling, and lifting. This adjustment method not only takes a long time to center and is inefficient, but may also cause the line of action of the force to not completely coincide with the axis of the sensor (the force can be decomposed into the axial force through the force sensor and the lateral force perpendicular to the axis. The lateral force causes the force sensor to be subjected to an additional bending moment). In this way, the high-precision sensor cannot accurately measure the magnitude of the applied external force, and the test results have certain deviations. Moreover, the poor coaxiality between the force sensor and the force standard machine will have an irreversible impact on the mechanical structure of the force standard machine in the long run, and will seriously damage the performance of the force standard machine.

[0003] In view of the above problems, it is urgent to design a sensor centering device for use in force standard machines. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide a force standard machine with a sensor centering device.

[0005] The utility model is achieved in this way:

[0006] A force standard machine with a sensor centering device, wherein the sensor centering device is arranged above the working table of the force standard machine, and the sensor centering device comprises: an actuator and a control mechanism;

[0007] The actuator is used to push the sensor to be tested on the work surface to move, and includes: a first electric push rod, a second electric push rod, a third electric push rod and a fourth electric push rod, wherein the first electric push rod, the second electric push rod, the third electric push rod and the fourth electric push rod are all installed on the work surface by screws, and are respectively located on the outer peripheral ring line of the sensor to be tested, and are arranged at equal intervals, and the movement direction of each electric push rod points to the center of the work surface;

[0008] The control mechanism is used to measure the offset of the sensor, and includes: a first laser ranging sensor, a second laser ranging sensor, a third laser ranging sensor and a fourth laser ranging sensor, and a controller connected to the components of the above-mentioned control mechanism; the first laser ranging sensor is installed above the end of the first electric push rod and is located in a straight line direction with the first electric push rod; the second laser ranging sensor is installed above the end of the second electric push rod and is located in a straight line direction with the second electric push rod; the third laser ranging sensor is installed above the end of the third electric push rod and is located in a straight line direction with the third electric push rod; the fourth laser ranging sensor is installed above the end of the fourth electric push rod and is located in a straight line direction with the fourth electric push rod; the controller is also electrically connected to the components of the actuator.

[0009] Furthermore, the force standard machine is a static weight force standard machine.

[0010] Furthermore, the force standard machine is a superposition type force standard machine.

[0011] The utility model has the advantages of simple structure, quick installation, and can realize automatic centering of the sensor on the force standard machine, reduce artificial centering errors, and improve the accuracy of centering, thereby ensuring the accuracy of the measurement value of the measuring sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be further described below in conjunction with the embodiments with reference to the accompanying drawings.

[0013] Figure 1 It is a structural schematic diagram of the utility model.

[0014] Figure 2 It is a schematic diagram of the use state of the utility model.

[0015] Figure 3 yes Figure 2 A magnified schematic diagram of part A in FIG.

[0016] Reference numerals:

[0017] 100-force standard machine, 101-working table, 200-sensor centering device, 201-first electric push rod, 202-second electric push rod, 203-third electric push rod, 204-fourth electric push rod, 2011-first laser ranging sensor, 2021-second laser ranging sensor, 2031-third laser ranging sensor, 2041-fourth laser ranging sensor, 300-sensor to be measured. DETAILED DESCRIPTION

[0018] See also Figure 1 and Figure 2As shown, a force standard machine 100 with a sensor centering device, a sensor centering device 200 is arranged above a working table 101 of the force standard machine 100, and the sensor centering device 200 includes: an actuator and a control mechanism;

[0019] The actuator is used to push the sensor 300 under test on the work surface 101 to move, and includes: a first electric push rod 201, a second electric push rod 202, a third electric push rod 203 and a fourth electric push rod 204. The first electric push rod 201, the second electric push rod 202, the third electric push rod 203 and the fourth electric push rod 204 are all installed on the work surface 101 by screws, and are respectively located on the outer peripheral ring line of the sensor 300 under test, and are arranged at equal intervals, that is, the four electric push rods are arranged at diagonal equidistant positions on the work surface 101 of the force standard machine, and the movement direction of each electric push rod points to the center of the work surface 101;

[0020] The control mechanism is used to measure the offset of the sensor 300, and includes: a first laser distance sensor 2011, a second laser distance sensor 2021, a third laser distance sensor 2031 and a fourth laser distance sensor 2041, and a controller (not shown) connected to the components of the above-mentioned control mechanism; the first laser distance sensor 2011 is installed above the end of the first electric push rod 201 and is located in a push rod straight line direction with the first electric push rod 201; the second laser distance sensor 2021 is installed above the end of the second electric push rod 202 and is located in a push rod straight line direction with the second electric push rod 202; the third laser distance sensor 2031 is installed above the end of the third electric push rod 203 and is located in a push rod straight line direction with the third electric push rod 203; the fourth laser distance sensor 204 is installed above the end of the fourth electric push rod 204 and is located in a push rod straight line direction with the fourth electric push rod 204; the controller is also electrically connected to the components of the actuator.

[0021] The force standard machine in this embodiment is a superposition type force standard machine. In specific practice, a sensor centering device may also be added to a static weight type force standard machine.

[0022] During operation, the sensor 300 to be tested is placed on the work surface 101, and the target sensor 300 is detected by each laser ranging sensor, and the displacement offset of each direction of the target sensor 300 is transmitted to the controller, thereby controlling each electric push rod to move the sensor 300 to perform automatic centering.

[0023] The utility model has the advantages of simple structure and quick installation, and can realize automatic centering of the sensor on the force standard machine, reduce the artificial centering error, improve the centering accuracy, and thus ensure the accuracy of the measurement value of the measuring sensor.

[0024] The above embodiments and drawings do not limit the product form and style of the present utility model. Any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present utility model.

Claims

1. A force standard machine with a sensor centering device, characterized in that: A sensor centering device is provided above the working table of the force standard machine, and the sensor centering device comprises: an actuator and a control mechanism; The actuator is used to push the sensor to be tested on the work surface to move, and includes: a first electric push rod, a second electric push rod, a third electric push rod and a fourth electric push rod, wherein the first electric push rod, the second electric push rod, the third electric push rod and the fourth electric push rod are all installed on the work surface by screws, and are respectively located on the outer peripheral ring line of the sensor to be tested, and are arranged at equal intervals, and the movement direction of each electric push rod points to the center of the work surface; The control mechanism is used to measure the offset of the sensor, and includes: a first laser ranging sensor, a second laser ranging sensor, a third laser ranging sensor and a fourth laser ranging sensor, and a controller connected to the components of the above-mentioned control mechanism; the first laser ranging sensor is installed above the end of the first electric push rod and is located in a straight line direction with the first electric push rod; the second laser ranging sensor is installed above the end of the second electric push rod and is located in a straight line direction with the second electric push rod; the third laser ranging sensor is installed above the end of the third electric push rod and is located in a straight line direction with the third electric push rod; the fourth laser ranging sensor is installed above the end of the fourth electric push rod and is located in a straight line direction with the fourth electric push rod; the controller is also electrically connected to the components of the actuator.

2. A force standard machine with a sensor centering device as claimed in claim 1, characterized in that: The force standard machine is a static weight force standard machine.

3. A force standard machine with a sensor centering device as claimed in claim 1, characterized in that: The force standard machine is a superposition type force standard machine.

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