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 utility model, 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 utility model belongs to the technical field of force measuring mechanisms, in particular to a wide-range tension and compression force measuring system. Background Art

[0002] Precise force measurement plays a key role in aerospace, high-speed rail, national defense, and other fields. With the rapid development of science, technology, and industry, the demand for force measurement is increasing, with ever-widening ranges and higher precision requirements. This poses a significant challenge to the development of force measurement methods and force sensors.

[0003] The operating range of typical force sensors is generally limited to 10% to 100% of the rated force. Beyond the lower or upper limits, accuracy is difficult to guarantee. Therefore, for some specific force measurement conditions, a single force sensor may struggle to meet both the force range and accuracy requirements.

[0004] Inner Mongolia University of Technology's master's thesis, "Research on the Dynamic Characteristics of a Dual-Range Pressure Sensor" (2015. Wang Chaoyang), discloses a dual-range pressure sensor composed of two sensors of different ranges, one large and one small. The main structure is that the large-range sensor and the small-range sensor are connected by cascade bolts, with a stop sleeve 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, with the top of the spring device connected to a stop baffle. The solution in this document uses an S-shaped sensor, with a small sensor range of 1kN and a large sensor of 100kN (the small sensor is 1% of the large sensor); however, in practice, the 1kN range of a 100kN sensor cannot achieve an accuracy of 0.01%, so there are problems 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 its longitudinal height is large, resulting in poor linearity. Utility Model Content

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

[0006] The utility model is achieved in this way:

[0007] A wide-range tension and compression force measurement system, consisting of, 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 joint.

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

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

[0010] The 50kN sensor is threaded upwardly to connect 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 power 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 gas spring is threaded upwardly 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 with 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 as follows: the present invention targets a large-scale use environment (500kN), to which the S-type sensor is not applicable, and the selection of specifications of large and small sensors is overlapped (the small sensor 50kN is 10% of the large sensor 500kN), which can ensure accuracy; the sensor is spoke-type, has good anti-lateral force effect, small linear error, and low installation height. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0023] Figure 1 It is the main view of the present utility model.

[0024] Figure 2 yes Figure 1 AA cross-sectional view.

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

[0026] Figure 4 It is an explosion diagram of the utility model.

[0027] Reference numerals:

[0028] 1-Lower force transmission rod, 2-500kN sensor, 3-500kN adapter flange, 4-External force transmission cylinder, 5-50kN sensor, 6-50kN sensor adapter flange, 7-Bidirectional nitrogen spring, 8-Force transmission 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 connect to the lower force transmission rod 1 and threaded upwardly to connect to the 500kN adapter flange 3;

[0031] The 500kN adapter flange 3 is connected to the external force transmission cylinder 4 through bolts and is screwed upward to the 50kN sensor 5;

[0032] The 50kN sensor 5 is threaded upwardly to connect to 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 threaded upwardly to connect with the force transmission cylinder cover 8;

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

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

[0039] The upper force-bearing rod 10 is threaded upwardly to connect the ball head 12;

[0040] An upper adjustment pad 13 is provided between the upper force-bearing rod 10 and the bidirectional nitrogen spring 7 for adjusting 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 utility model 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 varies with the stroke. The stroke is more than 5 times the stroke of the stop mechanism.

[0043] Four eye screws 15 are evenly spaced and locked on the outer side wall of the outer force transmission cylinder 4 to facilitate transportation.

[0044] Working principle:

[0045] A: When the upper load-bearing rod 10 is subjected to a tensile or compressive force no greater than 50 kN, which is less than the initial force of the elastic element, the elastic element piston does not move. The force transmission route is: upper load-bearing rod - elastic element piston - gas - elastic element cylinder - 50 kN sensor adapter flange - 50 kN sensor - external force transmission cylinder - 500 kN sensor adapter flange - 500 kN sensor. At this point, the 50 kN sensor performs the measurement.

[0046] B: When the upper load-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 elastic element piston displaces downward, the upper load-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 load-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 load-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 load-bearing rod 10 is subjected to a pulling force greater than 50kN, which is greater than the initial force value of the elastic element, the elastic element piston displaces upward, the upper load-bearing rod 10 reaches the upper limit but the piston has not reached the upper limit. Therefore, the transmission route of the force value greater than 50kN is: upper load-bearing rod-upper load-bearing connecting rod-upper cover-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 load-bearing rod-elastic element piston-gas-elastic element cylinder body-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 utility model realizes a large-scale use environment (500kN) that the S-type sensor is not applicable to, and overlaps the 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 anti-lateral force effect, 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 tensile and compressive force measurement system, characterized by: 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 joint; The 500kN sensor is threaded downwardly to connect to the lower force transmission rod and threaded upwardly to connect to the 500kN adapter flange; The 500kN adapter flange is connected to the external force transmission cylinder via bolts and is threaded upwardly to the 50kN sensor; The 50kN sensor is threaded upwardly to connect 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 power 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 gas spring is threaded upwardly 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 with 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 tensile and compressive force measurement system according to 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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