Stacked force standard machine device

Abstract

The utility model discloses a stacked force standard machine device which comprises a guide column, a guide column upper table top, a guide column lower table top, a stand column, a stand column upper table top, a stand column lower table top, a servo electric cylinder, a standard sensor, a measured sensor, a protective cover and a control box. The four guide columns are fixed to the guide column upper table top and the guide column lower table top through the stand column upper table top. The four stand columns are fixed to the stand column upper table top and the stand column lower table top. The standard sensor is fixedly arranged on the upper table surface of the guide post and is connected with the servo electric cylinder; and the servo electric cylinder is electrically connected with the control box. According to the stacked force standard machine device, the equipment structure is simple and easy to manufacture, the manufacturing cost and the machine tonnage are not obviously and greatly increased, the system loading and load holding are stable, the force value precision is high, and various technical index requirements of a force standard machine can be met.

Description

Technical Field

[0001] The utility model relates to a superposition type force standard machine device, in particular to an equipment device of a sensor comparison machine, belonging to the technical field of mechanical metrology. Background Art

[0002] As a precision instrument, the force standard machine is a basic equipment in industrial metrology. On the one hand, the force standard machine has very high requirements for load holding accuracy, which usually needs to reach the level of one ten-thousandth, so the technical difficulty of realization is relatively high, which is one of the technical barriers that need to be overcome in the domestic metrology field. On the other hand, the force standard machine involves the operating efficiency of metrology calibration. How to load to the metering point at the maximum speed without overshooting the force value, and how to stably hold the load within the control accuracy requirements in the shortest time are key technical indicators that the industry focuses on.

[0003] Currently, there are two main development directions in force standard machines. One is the superimposed weight static load force standard machine, which has accurate precision, but involves high-tonnage equipment, and the equipment is very large and expensive. The other is the application of electronic or electro-hydraulic servo control technology to achieve loading and holding control. The control system has strong flexibility, but has high requirements on the device manufacturing and control algorithm of the entire system. Summary of the invention

[0004] The purpose of the utility model is to realize a device for a superimposed force standard machine with simple structure, fast loading, fast and stable load holding and high control accuracy. The technical problems to be solved include: the designed device has a compact structure, is easy to manufacture, has high control accuracy, and can further improve the efficiency of metrology work by improving sensor comparison testing.

[0005] The technical solution adopted is: a superimposed force standard machine device, including: a guide column, an upper table of the guide column, a lower table of the guide column, a column, an upper table of the column, a lower table of the column, a servo electric cylinder, a standard sensor, a sensor to be measured, a protective cover, and a control box; there are four guide columns in total, which are fixed to the upper table of the guide column and the lower table of the guide column through the upper table of the column; there are four columns in total, which are fixed to the upper table of the column and the lower table of the column; the standard sensor is installed and fixed on the upper table of the guide column and connected to the servo electric cylinder; the servo electric cylinder is electrically connected to the control box.

[0006] Furthermore, the lower table of the guide column is movable, and is driven by the servo electric cylinder to push the upper table of the guide column, and divides the space formed by the upper table of the column and the lower table of the column into a tension test area and a pressure test area, so that the force value measurement and calibration of the force sensor in both tension and compression directions can be carried out.

[0007] Furthermore, the standard sensor, the servo electric cylinder, and the sensor to be measured are connected and installed on a coaxial line to ensure that the applied force is consistent.

[0008] Furthermore, the control box drives and controls the servo electric cylinder to apply force to the standard sensor and the sensor under test, so as to achieve high-precision load holding and rapid loading control of the force standard machine.

[0009] Furthermore, the control box is equipped with a control mainboard, a transformer, and a driver. The control mainboard includes: a main control chip circuit, a power supply circuit, an Ethernet communication circuit, a serial communication circuit, an input and output circuit, an AD acquisition circuit, and an encoder acquisition circuit.

[0010] Furthermore, the tension test area is used to install the tension sensor to be tested; and the pressure test area is used to install the pressure sensor to be tested.

[0011] Compared with the background technology, the beneficial effects are: the equipment structure is simple and easy to manufacture, and the manufacturing cost does not show a significant increase in cost with the machine tonnage. The system loading and holding load is stable, the force value accuracy is high, and it can meet the various technical indicators of the force standard machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural forward diagram of an embodiment of the present utility model.

[0013] Figure 2 It is a structural side view of an embodiment of the present utility model.

[0014] In the figure: 1. Upper surface of guide column, 2. Guide column, 3. Upper surface of column, 4. Lower surface of guide column, 5. Column, 6. Lower surface of column, 7. Servo cylinder, 8. Standard sensor, 9. Protective cover DETAILED DESCRIPTION

[0015] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] like Figure 1 and Figure 2As shown, a superimposed force standard machine device includes: a guide column 2, a guide column upper table 1, a guide column lower table 4, a column 5, a column upper table 3, a column lower table 6, a servo electric cylinder 7, a standard sensor 8, a sensor to be measured (not shown), a protective cover 9, and a control box (not shown); the guide columns 2 are four in total, and are fixed to the guide column upper table 1 and the guide column lower table 4 through the column upper table 3, and the column upper table 3 is processed with four through holes adapted to the outer diameter of the guide column 2 at corresponding positions; the columns 5 are four in total, and are fixed to the column upper table 3 and the column lower table 6; the standard sensor 8 is installed and fixed below the guide column upper table 6 and is connected to the servo electric cylinder 7; the servo electric cylinder 7 is electrically connected to the control box (not shown).

[0017] The lower table 4 of the guide column is movable, and is driven by the support rod of the servo electric cylinder 7 to push the upper table 1 of the guide column, and divide the space formed by the upper table 3 of the column and the lower table 6 of the column into a tension test area and a pressure test area, so that the force value measurement and calibration of the force sensor in the tension and compression directions can be carried out. The standard sensor, servo electric cylinder, and the sensor to be tested are connected and installed in a coaxial line, and the force applied by the servo electric cylinder is transmitted in the same direction to act on the standard sensor and the sensor to be tested. The tension test area and the pressure test area can be respectively installed with the tension sensor to be tested and the pressure sensor to be tested.

[0018] Furthermore, the length of the upright column 5 in this embodiment is designed to be 1200 mm, the length of the guide column 2 is designed to be 800 mm, and the width of the lower table of the guide column is designed to be 800 mm. The supported metering force value selected by the servo electric cylinder is 3 tons.

[0019] Furthermore, the control box drives and controls the servo electric cylinder to apply force to the standard sensor and the sensor under test, so as to achieve high-precision load holding and rapid loading control of the force standard machine.

[0020] Furthermore, the control box is equipped with a control mainboard, a transformer, and a driver. The control mainboard includes: a main control chip circuit, a power supply circuit, an Ethernet communication circuit, a serial communication circuit, an input and output circuit, an AD acquisition circuit, and an encoder acquisition circuit.

[0021] The working process of the utility model is: place the standard sensor and the sensor to be tested at the designated position of the device, connect the standard force gauge, control box and computer, and complete the preliminary preparation work of the force comparison operation. Turn on the power of the servo electric cylinder, turn on the control box and computer, and prepare to enter the force comparison process after the equipment passes the self-test.

[0022] First, the first stage of control, namely the open-loop control stage, is entered. The computer sends the open-loop frequency command of the servo electric cylinder. In this stage, no closed-loop control is performed on the force. The control box feeds back the force value signal collected from the standard dynamometer to the computer in real time, and the computer displays it in real time on its software interface.

[0023] When the collected force value has reached the inlet force, i.e. the first target force value, it indicates that the open-loop force loading stage has been completed, and the servo electric cylinder is now in contact with the standard sensor and the sensor under test. The control box enters the second stage, i.e. the first force value loading stage, according to the preset inlet force value. This stage is the force loading stage, and the first force channel is closed-loop controlled. The control box collects the force value from the standard dynamometer in real time, does not filter the force value signal, converts it into the actual value of the force change rate and the target value of the force change rate for closed-loop control, and calculates the servo motor control command value in real time to adjust the speed of the servo electric cylinder. The force loading rate can be set, and is generally set by the measurement and control software on the computer according to the test requirements.

[0024] When the difference between the collected force signal and the first holding force target is less than a preset loading buffer time, it indicates that the first force loading stage will enter the first force loading buffer period. This stage is the end of the first force loading stage, and the actual force loading speed is reduced to the minimum control speed of the system by quickly reducing the target loading rate. Through the operation of this buffer period, the loading speed is mainly reduced to the minimum speed as soon as possible so that the system can stably enter the holding stage and maximize the guarantee that the force value does not overshoot.

[0025] When the difference between the collected force signal and the first holding force target is less than a preset force interval, it indicates that the first force loading stage will end and enter the first force holding stage. At this time, the first force channel is closed-loop controlled, and the control box collects the actual force value and force target value from the standard dynamometer in real time for closed-loop control, and calculates the speed value of the servo electric cylinder in real time and sends it down.

[0026] When the first holding load reaches the predetermined time, it enters the next stage. Generally, loading and holding load are performed alternately and are pre-set by the computer measurement and control software test project. Generally, when the maximum holding load stage is completed, it indicates that the force comparison loading process is over and enters the system unloading stage.

[0027] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0028] The above embodiment only expresses one implementation method of the utility model, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A superimposed force standard machine device, It is characterized in that include: Guide column, guide column upper surface, guide column lower surface, column, column upper surface, column lower surface, servo electric cylinder, standard sensor, sensor to be measured, protective cover, control box; there are four guide columns in total, which are fixed to the guide column upper surface and guide column lower surface through the column upper surface; there are four columns in total, which are fixed to the column upper surface and column lower surface; the standard sensor is installed and fixed to the guide column upper surface and connected to the servo electric cylinder; the servo electric cylinder is electrically connected to the control box.

2. A superimposed force standard machine device according to claim 1, It is characterized in that The lower table of the guide column is movable, and is driven by the servo electric cylinder to push the upper table of the guide column, and divides the space formed by the upper table of the column and the lower table of the column into a tension test area and a pressure test area, so that the force value measurement and calibration of the force sensor in both tension and compression directions can be carried out.

3. A superimposed force standard machine device according to claim 1, It is characterized in that The standard sensor, servo electric cylinder and the sensor to be measured are connected and installed on the same axis to ensure that the applied force is consistent.

4. A superimposed force standard machine device according to claim 1, Features: The control box drives and controls the servo electric cylinder to apply force to the standard sensor and the sensor to be measured, so as to realize high-precision load holding and rapid loading control of the force standard machine.

5. A superimposed force standard machine device according to claim 1, Features: The control box is equipped with a control mainboard, a transformer and a driver. The control mainboard includes: a main control chip circuit, a power supply circuit, an Ethernet communication circuit, a serial communication circuit, an input and output circuit, an AD acquisition circuit and an encoder acquisition circuit.

6. A superimposed force standard machine device according to claim 2, It is characterized in that The tensile test area is used to install the tensile sensor to be tested; the pressure test area is used to install the pressure sensor to be tested.

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