CN103076137B - Build-up force standard machine capable of automatically centering - Google Patents

Abstract

The invention belongs to the automatic centering technology, and specifically discloses an automatic centering superimposed force standard machine. It consists of an upper plate and a lower plate. Pistons, oil cylinders and standard sensors are set on the upper plate. There is an upper pull plate and a moving beam between the upper plate and the lower plate. The upper pull plate is connected to the upper ends of two parallel screw screws through threads. , the moving beam is connected to the middle part of the above-mentioned lead screw through threads, and the lower end of the lead screw is provided with a pressing workbench. Through the structural design of the press-to-workbench, the calibration sensor is placed on the press-to-workbench, so that the measured sensor completes automatic centering, ensures that the gravity line of the tested sensor coincides with the center of the standard sensor, and reduces the use of superimposed force standard machines. The error in measuring the sensor. The performance of the superposition force standard machine has been further improved.

Description

A self-centering superimposed force standard machine

technical field

The invention belongs to the automatic centering technology, and in particular relates to a superimposed force standard machine.

Background technique

With the advancement of high-precision load cell technology and the improvement of hydraulic control technology, a standard sensor (or a group) is used as a standard, connected in series with the detected sensor, and the load is applied hydraulically or mechanically to determine the detected sensor. The superimposed force standard machine with force value parameters has begun to be widely used.

The ordinary superimposed force standard machine mainly uses the oil cylinder and the piston to load the standard sensor and the tested sensor at the same time. The two bear the same load. The size of the load is determined by the output of the standard sensor. When the output reaches a certain standard force value, the stability The force value and record the output of the sensor under test.

However, the force-bearing surface of the force sensor is generally convex, especially the high-precision standard force sensor, and the pressure cap matched with the high-precision standard sensor is a plane. The premise of the superimposed force standard machine is that the tested force sensor and the standard force sensor bear the same load under the action of the hydraulic cylinder plug system. Since the force sensor is symmetrical in structure, the center of gravity of the sensor can be approximately regarded as the symmetry line of the sensor, but it is difficult for the superimposed force standard machine to ensure that the center of gravity of the loading frame and the sensor to be calibrated is in a vertical line with the center of gravity of the standard sensor. On the line, this may cause the standard sensor and the tested sensor to tilt in the direction of the force when the cylinder plug system acts, making the loads of the standard sensor and the tested sensor inconsistent, affecting the accuracy of the superimposed force standard machine.

Contents of the invention

The object of the present invention is to provide a high-precision, self-centering superimposed force standard machine.

Technical scheme of the present invention is as follows:

A self-centering superimposed force standard machine, which includes an upper plate and a lower plate, an oil cylinder is arranged on the upper plate, a piston is arranged in the oil cylinder, and a standard sensor is arranged on the piston; An upper support plate is fixed on the upper plate, and the standard sensor on the piston is in contact with the lower surface of the support plate; an upper pull plate and a moving beam are arranged between the upper plate and the lower plate, and the center of the upper pull plate A pull-up rod is fixedly provided, and a pull-down rod is fixed in the center of the moving beam, and the pull-down rod and the pull-up rod are coaxial; the pull-up plate is connected to the upper ends of two parallel lead screws through threads, and the moving beam passes through The screw is connected to the middle part of the above-mentioned screw; the lower end of the screw is provided with a press-to-table; A circular through hole is arranged on the panel, and a cylindrical rod is arranged in the circular through hole.

In the above-mentioned self-centering superimposed force standard machine: the four corners of the upper pull plate are respectively provided with lower connecting rods, and the lower ends of the lower connecting rods pass through the main body panel pressed against the workbench and are fixed on The lower deck.

In the above-mentioned self-centering superimposed force standard machine: the lower plate is provided with a tapered cylindrical groove, and the lower connecting rod is installed in the above-mentioned tapered cylindrical groove through a tapered cylindrical pin.

In the above-mentioned self-centering superimposed force standard machine: a column is arranged between the upper table and the lower table.

In the above-mentioned self-centering superimposed force standard machine: the cylindrical rod is made of No. 45 steel.

In the above-mentioned self-centering superimposed force standard machine: the number of circular through holes is 19-37.

The remarkable effect of the present invention is that: through the structural design of the press-to-workbench, the calibration sensor is placed on the press-to-workbench, so that the measured sensor completes automatic centering, ensures that the gravity line of the tested sensor coincides with the center of the standard sensor, and reduces the use of The error when the superposition force standard machine measures the sensor under test. Further improve the accuracy and performance of the superposition force standard machine.

Description of drawings

Fig. 1 is the structural representation of the self-centering superposition type force standard machine of the present invention;

Fig. 2 is a schematic diagram of pressing to the workbench;

In the figure: 1. Upper support plate; 2. Standard sensor; 3. Piston; 4. Oil cylinder; 5. Upper connecting rod; 10. Pull down rod; 11. Upright column; 12. Screw rod; 13. Press to the workbench; 14. Cylindrical rod; 15. Lower table; 16. Tapered positioning groove; Hole; 19. Moving beam; 20. Disc mounting plate; 21. Main body panel.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in FIG. 1 , an upper pull-up plate 7 is threadedly installed on the upper ends of two mutually parallel screw rods 12 , and an upper pull-up rod 8 is fixedly installed in the center of the upper pull-up plate 7 . In the middle of these two leading screws 12, a moving beam 19 is installed by thread, and a lower rod 10 is fixedly installed in the center of the moving beam 19, and the lower rod 10 is coaxial with the above-mentioned upper rod 8.

After installing the upper pull plate 7 and the moving beam 19 with the lead screw 12 respectively, install one of the lower ends of the four lower connecting rods 9 to press against the worktable 13, and the two sides of the press-to-workbench 13 are processed with semicircular grooves , the above-mentioned two lead screws 12 pass through the semicircular grooves pressed to both sides of the worktable 13 respectively. The above-mentioned four lower connecting rods 9 Russian upper ends are fixedly installed on the upper pull plate 7.

The upper pull plate 7, the moving crossbeam 19 and the pressing table 13 are located between the upper plate 6 and the lower plate 15, and the upper pull plate 7 and the upper plate 6 are fixedly connected by these four lower connecting rods 9, The lower end of the lower connecting rod 9 is fixedly installed on the surface of the lower deck 15 simultaneously.

Four upper connecting rods 5 are installed on the upper platen 6, and the lower ends of the connecting rods 5 pass through the upper platen 6 respectively, and pass through the above-mentioned upper pull plate 7. In order to make the support between the upper deck 6 and the lower deck 15 stable, four columns 11 are fixedly installed between the upper deck 6 and the lower deck 15, so that the support is more stable.

An upper support plate 1 is fixedly mounted on the upper end of the upper connecting rod 5 . Between the top plate 6 and the upper support plate 1, the center of the above-mentioned upper plate 6 is fixedly equipped with an oil cylinder 4, a piston 3 is installed in the oil cylinder 4, a standard sensor 2 is installed on the piston, and the standard sensor 2 is connected to the upper support plate. 1 in contact with the lower surface.

As shown in Figure 2, the press-to-workbench schematic diagram, the described press-to-workbench comprises a main body panel 21, on which a disk mounting plate 20 is fixedly installed, and processed on the disk mounting plate 20 and the main body panel 21 There are several circular through holes 18, among the present embodiment, there are 19 circular through holes 18 processed. Inside each circular through hole 18 is placed a cylindrical rod 14 made of 45 gauge steel.

As shown in Figure 2, in order to make the loading frame composed of the upper support beam 1, the upper connecting rod 5, the upper pull plate 7, the lower connecting rod 9, the disk mounting plate 20 and the main body panel 21, in the process of testing the sensor The position is fixed, and the upper surface of the lower deck 15 is installed with a tapered positioning groove 16 at the position where the lower connecting rod 9 is installed, and the lower end of the upper connecting rod 9 is connected to the lower end of the upper connecting rod 9 by the tapered positioning pin 17 and the tapered positioning groove 16. Bottom plate 15 is installed and fixed.

After the upper support beam 1, the upper connecting rod 5, the upper pull plate 7, the lower connecting rod 9, the disc mounting plate 20 and the main body panel 21 are connected, the hydraulic control system is used to refuel the oil cylinder 4, and under the action of oil pressure, the piston 3 Jack up the standard sensor 2. When the standard sensor and the upper support beam contact the rear piston 3, the upper support beam 1, the upper connecting rod 5, the upper pull plate 7, the lower connecting rod 9, the disk mounting plate 20 and the main body panel 21 are jacked up. The top of 2 is convex, and under the action of gravity, the frame composed of upper support beam 1, upper connecting rod 5, upper pull plate 7, lower connecting rod 9, disc mounting plate 20 and main body panel 21 and the measured sensor The centerline direction of the standard sensor 2 is inclined, and the oil cylinder 4 is unloaded. At this time, the standard sensor 2, the upper support beam 1, the upper connecting rod 5, the upper pull plate 7, the lower connecting rod 9, the disc mounting plate 20 and the main body panel 21 will fall, and in the process of falling, the inclined bottom will first touch the lower deck 15, and after falling completely, the upper supporting beam 1, the upper connecting rod 5, the upper pull plate 7, the lower connecting rod 9, the disc mounting plate 20 and the main body The center of gravity of the frame formed by the panel 21 will be closer to the center of the standard sensor. After repeating this process 3-6 times, determine the position, and process the tapered positioning groove 16 on the position where the lower connecting rod 9 is installed on the upper surface of the lower platform 15 , the lower end of the upper connecting rod 9 and the lower deck 15 are installed and fixed by the tapered positioning pin 17 and the tapered positioning groove 16 . Make sure that the center of gravity of the frame composed of the upper support beam 1, the upper connecting rod 5, the upper pull plate 7, the lower connecting rod 9, the disk mounting plate 20 and the main body panel 21 coincides with the center of the sensor center.

Place the sensor to be tested on the cylindrical rod 14, use the hydraulic control system to refuel the oil cylinder 4, under the action of oil pressure, the piston 3 will lift the standard sensor 2, when the standard sensor and the upper support beam contact the rear piston 3, The upper support beam 1, the upper connecting rod 5, the upper pull plate 7, the lower connecting rod 9, the tapered positioning pin 17, the disc mounting plate 20 and the main body panel 21 are jacked up, and the tapered positioning pin 17 will break away from the tapered positioning groove 16 , as the jacking distance increases, the disc mounting plate will rise over the top of the cylindrical rod 14 to hold up the sensor under test. At this time, the center of gravity of the sensor under test deviates from the center of the standard sensor. The top is convex, and under the gravity of the sensor under test, it is composed of upper support beam 1, upper connecting rod 5, upper pull plate 7, lower connecting rod 9, tapered positioning pin 17, disc mounting plate 20 and main body panel 21 The frame of the frame and the sensor under test are tilted toward the center line of the standard sensor 2. After the sensor under test is fully lifted by the disc mounting plate 20, the oil cylinder 4 is unloaded. At this time, the standard sensor 2, the upper support beam 1, and the upper connecting rod 5. The upper pull plate 7, the lower connecting rod 9, the tapered positioning pin 17, the disc mounting plate 20 and the main body panel 21 will descend. During the descending process, the bottom of the inclined sensor under test will first touch the cylindrical rod 14, And tapered locating pin 17 will fall in the tapered locating groove 16, owing to have the effect of locating of tapered locating pin 17 in this process, upper supporting beam 1, upper connecting rod 5, upper pull plate 7, lower connecting rod 9, The positions of the tapered positioning pin 17, the disk mounting plate 20 and the main body panel 21 will not change, and the sensor under test will gradually move closer to the center of the standard sensor 2. After repeating this process 3-6 times, the sensor under test will be completed. centering.

Claims (4)

1. A self-centering superposition type force standard machine, it comprises upper deck (6) and lower deck (15), described upper deck (6) is provided with oil cylinder (4), in the oil cylinder (4) A piston (3) is provided, and a standard sensor (2) is arranged on the described piston (3); an upper supporting plate (1) is fixedly arranged on the described upper table (6), and an upper support plate (1) is fixed on the described upper plate (3), and The standard sensor (2) is in contact with the lower surface of the support plate (1); it is characterized in that: an upper pull plate 7 and a moving beam (19) are arranged between the upper plate (6) and the lower plate (15) , the center of the pull-up plate (7) is fixedly provided with a pull-up rod (8), the center of the moving beam (19) is fixedly provided with a pull-down rod (10), and the pull-down rod (10) and the pull-up rod (8) are coaxial; The above-mentioned pull-up plate (7) is connected to the upper ends of two parallel leading screws (12) by threads, and the moving beam (19) is connected to the middle part of the above-mentioned leading screws (12) by threads; The lower end of 12) is provided with pressing to workbench (13); This presses to workbench (13) and comprises main body panel (21), is provided with disc mounting plate (20) on it, and described disc mounting plate (20 ) and the main body panel (21) are provided with a circular through hole (18), and a cylindrical rod (14) is placed in the circular through hole (18); the four corners of the upper pull plate (7) are respectively provided with a lower The connecting rod (9), the lower end of the lower connecting rod (9) passes through the main body panel (21) pressed to the workbench (13), and is fixed on the lower deck (15); the lower deck (15) A tapered cylindrical groove (16) is arranged on the top, and the lower connecting rod (9) is installed in the above-mentioned tapered cylindrical groove (16) through a tapered cylindrical pin (17). 2. A self-centering superimposed force standard machine according to claim 1, characterized in that: a column (11) is provided between the upper table (6) and the lower table (15). 3. A self-centering superimposed force standard machine as claimed in claim 1, characterized in that: said cylindrical rod (14) is made of No. 45 steel. 4. The self-centering superimposed force standard machine according to claim 1, characterized in that: the number of said circular through holes (18) is 19-37.