Wide-range tension and compression direction force measuring system

Abstract

A wide-range tension and compression direction force measuring system comprises a lower dowel bar, a 500kN sensor, a 500kN sensor adapter flange, an outer force transmission cylinder, a 50kN sensor, a 50kN sensor adapter flange, a bidirectional nitrogen spring, a force transmission cylinder cover, an upper cover plate, an upper stress rod piece, an upper stress connecting rod and a ball head from bottom to top. The 500kN sensor is in downward threaded connection with the lower dowel bar, and is in upward threaded connection with the 500kN sensor adapter flange; the 500kN sensor adapter flange is connected with the outer force transmission cylinder through a bolt, and is upwards in threaded connection with the 50kN sensor; the 50kN sensor is upwards in threaded connection with a 50kN sensor adapter flange; the 50kN sensor adapter flange is connected with a bidirectional nitrogen spring through a bolt; the outer force transmission cylinder is upwards connected with a force transmission cylinder cover, an upper cover plate and an upper stress connecting rod; the two-way nitrogen spring is in upward threaded connection with the upper stress rod piece, the upper stress connecting rod and the ball head. According to the invention, a 500kN wide-range use environment is realized, the lateral force resistance effect is good, the linear error is small, and the installation height is low.

Description

Technical Field

[0001] The invention belongs to the technical field of force measuring mechanisms, and specifically refers to a wide-range tension and compression force measuring system. Background Art

[0002] Accurate force measurement plays a key role in aerospace, high-speed railway, national defense weapons and other fields. With the rapid development of science and technology and industry, the range of force measurement is becoming wider and wider, and the accuracy is becoming higher and higher, which poses a great challenge to the development of force measurement methods and force sensors.

[0003] For general force sensors, their working range is generally limited to (10-100)% of the rated force value. When the lower or upper limit is exceeded, the accuracy level is difficult to guarantee. Therefore, for some specific force measurement conditions, a single force sensor is difficult to meet the measurement force range and accuracy requirements.

[0004] The master's thesis of Inner Mongolia University of Technology, "Research on the Dynamic Characteristics of a Dual-range Pressure Sensor" (2015. Wang Chaoyang), discloses a dual-range pressure sensor, which is composed of two sensors of different ranges, large and small. The main structure is that the large-range sensor and the small-range sensor are connected by cascade bolts, and a stop sleeve is sandwiched between the two sensors. The small-range sensor is rigidly connected to the bottom of the sleeve, and a spring device is added to the small-range sensor. The top of the spring device is connected to the stop baffle. The solution in this document uses an S-type sensor, with a small sensor range of 1kN and a large sensor of 100kN (the small sensor is 1% of the large sensor); but in practice, the 1kN range of a 100kN sensor cannot reach an accuracy of 0.01%, so there is a problem with range selection. At the same time, the structure of the S-shaped sensor itself is not suitable for a large-range use environment, and the longitudinal height is large, and the linearity is poor. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a wide-range tension and compression force measuring system.

[0006] The present invention is achieved in that:

[0007] A wide range tension and compression force measurement system, including from bottom to top: a lower force transmission rod, a 500kN sensor, a 500kN adapter flange, an external force transmission cylinder, a 50kN sensor, a 50kN sensor adapter flange, a bidirectional nitrogen spring, a force transmission cylinder cover, an upper cover plate, an upper force-bearing rod, an upper force-bearing connecting rod, and a ball head;

[0008] The 500kN sensor is threaded downwardly to the lower force transmission rod and threaded upwardly to the 500kN adapter flange;

[0009] The 500kN adapter flange is connected to the external force transmission cylinder by bolts and is threaded upwardly to the 50kN sensor;

[0010] The 50kN sensor is threaded upwardly to the 50kN sensor adapter flange;

[0011] The 50kN sensor adapter flange is connected to the bidirectional nitrogen spring via bolts;

[0012] The outer force transmission cylinder is threaded upwardly and connected to the force transmission cylinder cover;

[0013] The force transmission cylinder cover is connected to the upper cover plate upwardly by bolts;

[0014] The upper cover plate is threaded upwardly to be connected to the upper force-bearing connecting rod;

[0015] The bidirectional nitrogen spring is threaded upwardly connected to the upper force-bearing rod;

[0016] The upper force-bearing rod is upwardly sleeved into the upper force-bearing connecting rod;

[0017] The upper force-bearing rod is threaded upwardly to connect the ball head;

[0018] An upper adjustment pad is provided between the upper force-bearing rod and the bidirectional nitrogen spring for adjusting the compression gap;

[0019] A lower adjustment pad is provided between the upper force-bearing connecting rod and the upper cover plate for adjusting the pulling gap.

[0020] Furthermore, the outer side wall of the outer force transmission cylinder is locked with a plurality of eye screws for easy transportation.

[0021] The advantages of the present invention are: the present invention targets a large-range use environment (500kN), which is not applicable to S-type sensors, and the selection of large and small sensor specifications overlaps (the small sensor 50kN is 10% of the large sensor 500kN), which can ensure accuracy; the sensor is spoke-type, has good lateral force resistance, small linear error, and low installation height. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below in conjunction with embodiments with reference to the accompanying drawings.

[0023] Figure 1 It is the front view of the present invention.

[0024] Figure 2 yes Figure 1 AA section view.

[0025] Figure 3 It is a top view of the present invention.

[0026] Figure 4 It is an exploded schematic diagram of the present invention.

[0027] Reference numerals:

[0028] 1-lower force transfer rod, 2-500kN sensor, 3-500kN adapter flange, 4-external force transfer cylinder, 5-50kN sensor, 6-50kN sensor adapter flange, 7-bidirectional nitrogen spring, 8-force transfer cylinder cover, 9-upper cover plate, 10-upper force rod, 11-upper force connecting rod, 12-ball head, 13-upper adjustment pad, 14-lower adjustment pad, 15-lifting eye screw. DETAILED DESCRIPTION

[0029] like Figures 1 to 4 As shown, from bottom to top, it includes: lower force transmission rod 1, 500kN sensor 2, 500kN adapter flange 3, external force transmission cylinder 4, 50kN sensor 5, 50kN sensor adapter flange 6, bidirectional nitrogen spring 7, force transmission cylinder cover 8, upper cover plate 9, upper force rod 10, upper force connecting rod 11, and ball head 12;

[0030] The 500kN sensor 2 is threaded downwardly to the lower force transmission rod 1 and threaded upwardly to the 500kN adapter flange 3;

[0031] The 500kN adapter flange 3 is connected to the external force transmission cylinder 4 by bolts, and is threaded upwardly to the 50kN sensor 5;

[0032] The 50kN sensor 5 is threaded upwardly to connect the 50kN sensor adapter flange 6;

[0033] The 50kN sensor adapter flange 6 is connected to the bidirectional nitrogen spring 7 through bolts;

[0034] The outer force transmission cylinder 4 is threadedly connected to the force transmission cylinder cover 8 upward;

[0035] The force transmission cylinder cover 8 is connected to the upper cover plate 9 upwardly by bolts;

[0036] The upper cover plate 9 is threaded upwardly to be connected to the force-bearing connecting rod 11;

[0037] The bidirectional nitrogen spring 7 is threaded upwardly and connected to the load-bearing rod 10;

[0038] The upper force bearing rod 10 is inserted upward into the upper force bearing connecting rod 11;

[0039] The upper force bearing rod 10 is threadedly connected to the ball head 12 upward;

[0040] An upper adjustment pad 13 is provided between the upper force-bearing rod 10 and the bidirectional nitrogen spring 7 to adjust the compression gap;

[0041] A lower adjustment pad 14 is provided between the upper force-bearing connecting rod 11 and the upper cover plate 9 for adjusting the pulling gap.

[0042] The elastic element in the present invention adopts a high-pressure bidirectional nitrogen spring 7. When the force is below 50kN, the piston does not move due to the gas pressure; when the force exceeds 50kN, the piston will move relatively, and the transmitted force changes with the stroke; its stroke is more than 5 times greater than the stroke of the stop mechanism.

[0043] The outer side wall of the outer force transmission cylinder 4 is evenly locked with four eye screws 15 for easy transportation.

[0044] Working principle:

[0045] A: When the upper force-bearing rod 10 is subjected to a pulling or compressing force not greater than 50kN, which is less than the initial force value of the elastic element, the elastic element piston does not move, and the force transmission route is: upper force-bearing rod-elastic element piston-gas-elastic element cylinder-50kN sensor adapter flange-50kN sensor-external force transmission cylinder-500kN sensor adapter flange-500kN sensor. At this time, the 50kN sensor is used for measurement.

[0046] B: When the upper force-bearing rod 10 is subjected to a compressive force greater than 50kN, which is greater than the initial force value of the elastic element, the piston of the elastic element moves downward, the upper force-bearing rod 10 reaches the lower limit but the piston has not reached the lower limit. Therefore, the transmission route of the force value greater than 50kN is: upper force-bearing rod-force transmission cylinder head-external force transmission cylinder-500kN sensor adapter flange-500kN sensor; the transmission route of the force value less than 50kN is: upper force-bearing rod-elastic element piston-gas-elastic element cylinder 50kN sensor adapter flange-50kN sensor-external force transmission cylinder-500kN sensor adapter flange-500kN sensor.

[0047] However, both force values ​​are ultimately borne by the 500kN sensor, so the measurement is not affected.

[0048] After unloading, the stop mechanism automatically returns to the middle position due to the elimination of the deformation of the sensor elastic body.

[0049] C: When the upper force-bearing rod 10 is pulled by a force greater than 50kN, which is greater than the initial force value of the elastic element, the piston of the elastic element moves upward, and the upper force-bearing rod 10 reaches the upper limit while the piston does not reach the upper limit. Therefore, the transmission route of the force value greater than 50kN is: upper force-bearing rod-upper force connecting rod-upper cover plate-force transmission cylinder head-external force transmission cylinder-500kN sensor adapter flange-500kN sensor; the transmission route of the force value less than 50kN is: upper force-bearing rod-elastic element piston-gas-elastic element cylinder-50kN sensor adapter flange-50kN sensor-external force transmission cylinder-500kN sensor adapter flange-500kN sensor.

[0050] However, both force values ​​are ultimately borne by the 500kN sensor, so the measurement is not affected.

[0051] After unloading, the stop mechanism automatically returns to the middle position due to the elimination of the deformation of the sensor elastic body.

[0052] The present invention realizes a large-range use environment (500kN), which is not applicable to S-type sensors, and overlaps in the selection of specifications of large and small sensors (the small sensor 50kN is 10% of the large sensor 500kN), which can ensure accuracy; the sensor is spoke-type, has good lateral force resistance, small linear error, and low installation height.

[0053] The above embodiments and drawings do not limit the product form and style of the present invention. 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 invention.

Claims

1. A wide range tension and compression force measurement system, characterized in that: From bottom to top, this includes: Lower force transmission rod, 500kN sensor, 500kN adapter flange, external force transmission cylinder, 50kN sensor, 50kN sensor adapter flange, bidirectional nitrogen spring, force transmission cylinder cover, upper cover plate, upper force rod, upper force connecting rod, ball head; The 500kN sensor is threaded downwardly to the lower force transmission rod and threaded upwardly to the 500kN adapter flange; The 500kN adapter flange is connected to the external force transmission cylinder by bolts, and is threaded upwardly to the 50kN sensor; The 50kN sensor is threaded upwardly to the 50kN sensor adapter flange; The 50kN sensor adapter flange is connected to the bidirectional nitrogen spring via bolts; The outer force transmission cylinder is threaded upwardly and connected to the force transmission cylinder cover; The force transmission cylinder cover is connected to the upper cover plate upwardly by bolts; The upper cover plate is threaded upwardly to be connected to the upper force-bearing connecting rod; The bidirectional nitrogen spring is threaded upwardly connected to the upper force-bearing rod; The upper force-bearing rod is upwardly sleeved into the upper force-bearing connecting rod; The upper force-bearing rod is threaded upwardly to connect the ball head; An upper adjustment pad is provided between the upper force-bearing rod and the bidirectional nitrogen spring for adjusting the compression gap; A lower adjustment pad is provided between the upper force-bearing connecting rod and the upper cover plate for adjusting the pulling gap.

2. A wide range tension and compression force measurement system as claimed in claim 1, characterized in that: The outer side wall of the outer force transmission cylinder is locked with a plurality of eye screws for easy transportation.

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