CN106644260B - 2MN dead weight superposition composite force standard machine - Google Patents

Abstract

The 2MN dead weight superposition compound force standard machine comprises an upper loading mechanism and a frame; the upper loading mechanism comprises an upper beam, a base, four ball screws, a movable beam and four peripheral support columns; the four ball screws penetrate through the upper beam and the base, and the movable beam is sleeved on the four ball screws; the frame is positioned below the base; the frame forms a rigid cage structure; the device also comprises a 2MN oil cylinder piston, a bearing plate and a standard sensor group; the 2MN cylinder piston is arranged on the upper beam; the standard sensor group consists of 3 680KN sensors, and is embedded in the movable beam; the bearing plate is arranged on the movable beam. The invention realizes the two-in-one of the dead weight type force standard machine and the superposition type force standard machine, and effectively improves the utilization rate and the detection efficiency of the equipment. And the design and the manufacture of a hanging mechanism for disassembling and assembling the weights without barriers are realized.

Description

2MN static superposition and compound force standard machine

【Technical field】

The invention belongs to the technical field of a force standard machine, and specifically refers to a 2MN static superposition and compound force standard machine.

【Background technique】

Force measurement has an important relationship with the country's economic construction, national defense construction, scientific research and people's life. The force standard device is a force value measurement standard that generates a standard force value and is used to verify and calibrate a standard force gauge or a force sensor. It is called a force standard machine. There are generally four types of force standard machines: deadweight, lever, hydraulic, and superimposed.

The force value generated by the gravity of the weight in the gravitational field of the earth is used to establish the force value base and standard, and the quality of the weight can be directly traced to the quality standard, which can obtain high accuracy. This type of force standard machine is called "static weight force standard machine". At present, countries around the world have adopted the benchmark for traceability of static force standard machines. The world's largest static force standard machine is 1000KLBF (about 4.5mn) of the National Standard and Technology Research Institute (NIST). The relative expansion of the force value is 0.002 % (K = 3). China's largest static force standard machine is to store it in China Test Technology Research Institute in China. The national benchmark of 1mn force value, the relative extension of the force value is 0.002 % (k = 3). The static weight force standard machine is bulky and expensive, and because of its highest accuracy, all countries in the world have established it as the highest standard (benchmark) for force value measurement.

A force standard machine that uses a force sensor as a reference standard, is connected in series with the sensor to be tested, and applies a load mechanically or hydraulically. This type of force standard machine is called "superimposed force standard machine" internationally. Due to the simple structure and relatively low cost of the superimposed force standard machine, the accuracy is not as high as that of the static weight force standard machine but it can meet the needs of verification and calibration, so it is adopted by countries all over the world.

【Content of invention】

The technical problem to be solved by the present invention is to provide a 2MN static superposition and compound force standard machine, which realizes the two-in-one of the static weight force standard machine and the superimposed force standard machine, and effectively improves the equipment utilization rate and detection efficiency.

The present invention is achieved like this:

The 2MN static superposition and compound force standard machine includes an upper loading mechanism and a frame; the upper loading mechanism includes an upper beam, a base, four ball screws, a moving beam, and four surrounding support columns; the four ball screws are penetrated on the upper beam and the base, and the moving beam is sleeved on the four ball screws; the frame is located below the base; the frame forms a rigid cage structure; The cylinder piston is installed on the upper beam; the standard sensor group consists of three 680KN sensors embedded in the moving beam; the pressure bearing plate is arranged on the moving beam.

Further, the upper loading mechanism is also provided with a reverser and a pull connector; the frame is provided with a central boom; the reverser includes an upper support, a column, and a lower support; the upper support and the lower support are connected through the column; The spherical connecting piece, the arc-shaped support set on the inner bottom of the lower support; the spherical connecting piece with a central hole is sleeved on the central suspender; the bottom of the spherical connecting piece with a central hole is a spherical surface, which is in contact with the arc-shaped support; the number of the columns is three, and the interval between the upper support and the lower support is evenly distributed.

Further, the bottom of the frame is a mounting seat; the mounting seat is a hollow structure, and one side is hollow; a weight removal mechanism extends from the hollow part of the mounting seat into the hollow structure of the mounting seat, and is used to take out the weight from the frame; an external lifting mechanism extends into the frame, and is used to lift the weight in the frame; the frame is equipped with a central suspension rod, weights, a weight tray, and a ferrule; the weight and the weight tray are set on the central suspension rod; Groove; the ferrule is two semicircular clasps; the two semicircular clasps are clamped in the groove; the outer edge of the weight tray extends downwards, just constraining the ferrule clamped in the groove.

Further, a suspension system loading state detection device is installed at the center of the inner bottom of the frame, including a detection seat and six non-contact probes; the detection seat is a circular structure, concentric with the suspension system; the detection seat includes a base part and a ring part; the six non-contact probes are evenly distributed on the ring part.

Further, the non-contact probe is a non-contact displacement sensor.

The advantages of the present invention are:

The 2MN static overlapping and compound force standard device of the present invention adopts the static overlapping and compound design, which can effectively improve the detection efficiency and equipment utilization rate. The present invention focuses on improving the design of the static weight type force standard machine structure, specifically the design and manufacture of a hanging mechanism that can realize barrier-free disassembly and assembly of weights, and the design and manufacture of a superimposed static weight compound frame structure.

【Description of drawings】

The present invention will be further described below with reference to the accompanying drawings and embodiments.

Fig. 1 is a schematic diagram of the structure of the present invention.

Fig. 2 is a structural schematic diagram of the first-stage hanging part in the present invention.

Fig. 3 is a schematic diagram of a part of the joint bearing in the present invention.

Fig. 4 is a schematic diagram of the frame structure in the present invention.

Fig. 5 is a structural schematic diagram of the weight and the weight tray device in the present invention.

Fig. 6 is the detection device for the loading state of the suspension system in the present invention.

【Detailed ways】

As shown in Fig. 1, 2MN static superposition adds compound type force standard machine, comprises upper loading mechanism 1, frame 2; Said upper loading mechanism 1 comprises upper beam 11, base 12, four ball screw rods 13, moving beam 14, four supporting pillars 15 of periphery; It forms a rigid cage structure; it also includes a 2MN oil cylinder piston 3, a pressure plate 4 and a standard sensor group 5; the 2MN oil cylinder piston 3 is installed on the upper beam 11; the standard sensor group 5 is composed of three 680KN sensors embedded in the moving beam 14; the pressure plate 4 is arranged on the moving beam 14. The 2MN static overlapping and compound force standard device of the present invention adopts the static overlapping and compound design, which can effectively improve the detection efficiency and equipment utilization rate.

As shown in Figures 2 and 3, the upper loading mechanism 1 is also provided with a reverser 6 and a pull-to connector 7; the frame 2 is provided with a center boom 8; the reverser 6 includes an upper support 61, a column 62, and a lower support 63; the upper support 61 and the lower support 63 are connected by a column 62; 8 are threadedly connected; the lower support 63 is connected with the central suspender 8 through a joint bearing 9; the joint bearing 9 includes a spherical connector 91 with a central hole, and an arc-shaped support member 92 located at the inner bottom of the lower support 63; the spherical connector 91 with a central hole is sleeved on the central suspender 8; The distance between the upper support 61 and the lower support 63 is evenly distributed. The reverser 6 and the central suspender 8 of the present invention can be separated, and the reverser works when the tested piece is subjected to a compression test, and the load of the reverser is 20kN, which is used as the first stage load of the force standard machine. When performing a pull test on the tested piece, the reverser 6 is disengaged from the central suspender 8 and does not work, which avoids the influence of the tilting and swinging of the reverser 6 on the measurement accuracy. Since the reverser 6 and the central suspender 8 can be separated, the complete machine can be calibrated according to regulations within the range of 20kN to 2MN, which expands the range and improves the accuracy of the pull test measurement.

As shown in Figure 4, the bottom of the frame 2 is the mounting seat 10; the mounting seat 10 is a hollow structure, and one side is hollow; a weight removal mechanism 20 extends from the hollow part of the mounting seat 10 into the hollow structure of the mounting seat 10, and is used to take out the weight from the frame 2; , weight 21, weight tray 22, ferrule 23; the weight 21 and the weight tray 22 are sheathed on the center suspender 8; the center suspender 8 is provided with a groove 81; the ferrule 23 is two semicircular snap rings; the two semicircular snap rings are snapped in the groove 81; Facilitates quick removal of weights. When the force standard machine is not working, start to disassemble the weights. At this time, the weights are placed on the weight loading and unloading mechanism 400. During the disassembly work, the weight dismounting and moving mechanism 20 is moved to the bottom of the weights, and the weight tray is moved up. The two semicircular snap rings (card sleeves 23) are not restrained by the weight tray 22. Remove it, and then the weight tray 22 can be moved to the bottom of the center boom 8 without hindrance. Rotating at a certain angle, the external lifting mechanism can transport the weights to the weight removal and moving mechanism at the bottom of the rack without obstacles, and the weights are removed for verification. The weight 21 and the weight tray 22 sleeved on the center suspender 8 are disassembled step by step according to the above steps from bottom to top, so as to ensure that all weights and weight hanging devices can be disassembled and assembled quickly without hindrance, so as to verify.

As shown in Figure 6, a suspension system loading state detection device is installed at the center of the bottom of the frame 2, including a detection base 100 and six non-contact probes 200; the detection base 100 is a circular structure, concentric with the suspension system; the detection base 100 includes a base portion 101 and an annular portion 102; the six non-contact probes 200 are evenly distributed on the annular portion. The non-contact probe 200 is a non-contact displacement sensor. The deflection of the center boom and reverser can be calculated from the measurements of the six non-contact heads. When the inclination exceeds the allowable requirements, stop the test, recheck the placement position of the tested part and other factors that affect the hanging deflection, and retest after adjustment to improve the measurement accuracy.

The invention focuses on the improved design of the static weight type force standard machine structure, which can realize the design and manufacture of the hanging mechanism for barrier-free disassembly and assembly of weights, and the design and manufacture of superimposed static weight compound frame structure.

The above descriptions are only preferred implementation examples of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (3)

1. The 2MN static superposition and compound force standard machine includes an upper loading mechanism and a frame; the upper loading mechanism includes an upper beam, a base, four ball screws, a moving beam, and four surrounding supporting columns; the four ball screws are set on the upper beam and the base, and the moving beam is sleeved on the four ball screws; the frame is located below the base; the frame forms a rigid cage structure; The 2MN oil cylinder piston is installed on the upper beam; the standard sensor group is composed of three 680KN sensors, which are embedded in the moving beam; the pressure bearing plate is arranged on the moving beam; The upper loading mechanism is also provided with a reverser and a pulling connector; the frame is provided with a central boom; the reverser includes an upper support, a column, and a lower bearing; The spherical connecting piece with the central hole, the arc-shaped support set at the inner bottom of the lower support; the spherical connecting piece with the central hole is sleeved on the central suspender; the bottom of the spherical connecting piece with the central hole is spherical and abuts against the arc-shaped support; the number of the columns is three, and the interval between the upper support and the lower support is evenly distributed; The bottom of the frame is a mounting seat; the mounting seat is hollow, and one side is hollow; a weight loading and unloading mechanism is arranged on the inner wall of the frame; a weight dismounting mechanism extends from the hollow part of the mounting seat into the hollow structure of the mounting seat, and is used to take out the weight from the frame; an external lifting mechanism extends into the frame, and is used to lift the weight in the frame; the frame is provided with a central suspension rod, weights, a weight tray, and a ferrule; the weight and the weight tray are set in the center On the suspension rod; the central suspension rod is provided with a groove; the ferrule is two semicircular clasps; the two semicircular clasps are clamped in the groove; the outer edge of the weight tray extends downwards to constrain the ferrule clamped in the groove. 2. 2MN static superposition plus compound type force standard machine as claimed in claim 1, it is characterized in that: described frame inner bottom center is equipped with a suspension system loading state detecting device, comprises a detection seat, six non-contact probes; Described detection seat is circular structure, concentric with suspension system; Described detection seat comprises base portion, ring portion; Described six non-contact probes are evenly distributed on the described ring portion. 3. The 2MN static superposition compound force standard machine according to claim 2, characterized in that: the non-contact probe is a non-contact displacement sensor.