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CN-122016021-A - Double-bridge weighing sensor

CN122016021ACN 122016021 ACN122016021 ACN 122016021ACN-122016021-A

Abstract

The invention discloses a double-bridge weighing sensor which comprises an elastomer, a first strain gauge set, a second strain gauge set, a first PCB (printed circuit board) set, a second PCB (printed circuit board) set and two cables, wherein the first strain gauge set and the second strain gauge set are arranged on the elastomer and are positioned on the upper surface and the lower surface of a strain area, and the first strain gauge set and the second strain gauge set on the same surface are symmetrically arranged relative to the central position of the elastomer in the width direction. Each wheatstone bridge of the invention has an independent excitation power source, when the sensor is loaded, two of four strain gauges on the wheatstone bridge are stretched, two are compressed, therefore, an electric signal proportional to the loading load is generated, and the strain gauge mounting mode can greatly reduce the angle difference of the double-bridge sensor weighing sensor, thereby being beneficial to improving the precision of the sensor. Two independent Wheatstone bridges are arranged on one sensor, so that the use cost is reduced, and the size of the whole weighing system is reduced.

Inventors

  • ZHANG YANJUN
  • M.J. Fischer

Assignees

  • 霍丁格必凯(苏州)电子测量技术有限公司

Dates

Publication Date
20260512
Application Date
20260331

Claims (6)

  1. 1. The utility model provides a double bridge weighing sensor, its characterized in that, including elastomer (1), first strain gauge group (2), second strain gauge group (3), first PCB circuit board group, second PCB circuit board group and two cable (6), elastomer (1) is cuboid structure, elastomer length direction's intermediate position is equipped with the strain zone, first strain gauge group (2), second strain gauge group (3) all set up on the elastomer and lie in the upper surface and the lower surface of strain zone, and the central point symmetry of the width direction of first strain gauge group (2), second strain gauge group (3) on same surface sets up on the upper surface and the lower surface of elastomer, first PCB circuit board group, second PCB circuit board group on same surface set up on the upper surface and lower surface of elastomer, the central point symmetry of the width direction of second PCB circuit board group is relative to the elastomer sets up, the input of first PCB circuit board group and second PCB circuit board group and the output of second strain gauge group (2) on same surface and the opposite direction's the output end of second PCB circuit board (3), the output of first PCB circuit board group and second PCB circuit board group opposite to each other is connected to the output end of first PCB circuit board group, second PCB circuit board group and the opposite direction.
  2. 2. The double-bridge weighing sensor according to claim 1, wherein the first strain gauge group (2) comprises a first strain gauge (21), a second strain gauge (22), a third strain gauge (23) and a fourth strain gauge (24), the first strain gauge (21) and the second strain gauge (22) are arranged on the upper surface of an elastic body strain area at intervals along the length direction of the elastic body, and the third strain gauge (23) and the fourth strain gauge (24) are arranged on the lower surface of the strain area at intervals along the length direction of the elastic body; The second strain gauge group (3) comprises a fifth strain gauge (31), a sixth strain gauge (32), a seventh strain gauge (33) and an eighth strain gauge (34), wherein the fifth strain gauge (31) and the sixth strain gauge (32) are arranged on the upper surface of the elastic body strain area at intervals along the length direction of the elastic body and are symmetrically arranged with the central position of the first strain gauge (21) and the second strain gauge (22) relative to the width direction of the elastic body respectively, the seventh strain gauge (33) and the eighth strain gauge (34) are arranged on the lower surface of the elastic body strain area at intervals along the length direction of the elastic body and are symmetrically arranged with the central position of the third strain gauge (23) and the fourth strain gauge (24) relative to the width direction of the elastic body respectively, the resistance value of the first strain gauge (21) is smaller than the resistance value of the second strain gauge (22), the resistance value of the third strain gauge (23) is smaller than the resistance value of the fourth strain gauge (24), and the resistance value of the fifth strain gauge (31) is smaller than the resistance value of the seventh strain gauge (32).
  3. 3. The double-bridge weighing sensor according to claim 2, wherein a mounting hole (11) and a mounting groove (12) are formed in the left end of the elastic body (1) in the length direction, the mounting hole (11) penetrates through the upper surface and the lower surface of the elastic body (1), and the mounting groove (12) is concavely formed in the upper surface or the lower surface of the elastic body (1). And the elastomer is formed by processing aluminum materials after anodic oxidation.
  4. 4. A double-bridge weighing sensor according to claim 3, wherein the right end of the length direction of the elastic body is provided with a circuit connecting hole (13), a first cable mounting hole (14), a second cable mounting hole (15) and a transition hole (16), the circuit connecting hole (13) penetrates through the upper surface and the lower surface of the elastic body, the first cable mounting hole (14) and the second cable mounting hole (15) are arranged inwards at the right end face of the elastic body with the opposite length, the axial directions of the first cable mounting hole (14) and the second cable mounting hole (15) are consistent with the length direction of the elastic body, and the transition hole (16) is communicated with the circuit connecting hole (13), the first cable mounting hole (14) and the second cable mounting hole (15).
  5. 5. The double-bridge weighing sensor according to claim 4, wherein the first PCB circuit board group comprises a first PCB circuit board (41) and a second PCB circuit board (42), the second PCB circuit board group comprises a third PCB circuit board (51) and a fourth PCB circuit board (52), the first PCB circuit board (41) and the third PCB circuit board (51) are arranged on the upper surface of the elastic body, and the second PCB circuit board (42) and the fourth PCB circuit board (52) are arranged on the lower surface of the elastic body.
  6. 6. The double-bridge weighing sensor according to claim 5, wherein the two cables (6) comprise a first cable (61) and a second cable (62), the first cable (61) and the second cable (62) are arranged in the first cable mounting hole (14) and the second cable mounting hole (15) in a penetrating mode, the first cable (61) is electrically connected with the first PCB circuit board (41) and the second PCB circuit board (42), and the second cable (62) is electrically connected with the third PCB circuit board (51) and the fourth PCB circuit board (52).

Description

Double-bridge weighing sensor Technical Field The invention belongs to the technical field of sensors, and particularly relates to a double-bridge weighing sensor. Background In the conventional technology, the weighing sensor is a single bridge sensor, namely, only one Wheatstone bridge is arranged in the sensor. However, in special situations, such as the medical field, if there is no redundant design, there may be life safety hazards when the individual sensor bridges are out of balance or damaged. If it is desired to reduce or avoid this risk, it is necessary to equip two or even more conventional single bridge load cells, which not only increases the cost for the user, but also takes up a considerable amount of space for the entire weighing system. Therefore, a dual bridge load cell is needed. Disclosure of Invention In order to solve the defects in the prior art, the invention provides a double-bridge weighing sensor. In order to solve the technical problems, the invention provides the following technical scheme: The invention provides a double-bridge weighing sensor which comprises an elastomer, a first strain sheet group, a second strain sheet group, a first PCB (printed Circuit Board) group, a second PCB (printed Circuit Board) group and two cables, wherein the elastomer is of a cuboid structure, a strain area is arranged at the middle position of the length direction of the elastomer, the first strain sheet group and the second strain sheet group are arranged on the elastomer and are positioned on the upper surface and the lower surface of the strain area, the first strain sheet group and the second strain sheet group on the same surface are symmetrically arranged relative to the central position of the width direction of the elastomer, the PCB (printed Circuit Board) is arranged on the upper surface and the lower surface of the elastomer, the first PCB (printed Circuit Board) group and the second PCB) group on the same surface are symmetrically arranged relative to the central position of the width direction of the elastomer, the input end of the first PCB circuit board group is electrically connected with the output end of the first strain sheet group, the input end of the second PCB group is electrically connected with the output end of the second strain sheet group, and the two cables penetrate through the right end surface of the elastomer and are electrically connected with the first PCB and the second PCB group. Preferably, the first strain gauge group comprises a first strain gauge, a second strain gauge, a third strain gauge and a fourth strain gauge, wherein the first strain gauge and the second strain gauge are arranged on the upper surface of the strain area of the elastic body at intervals along the length direction of the elastic body, and the third strain gauge and the fourth strain gauge are arranged on the lower surface of the strain area at intervals along the length direction of the elastic body; The second strain gauge group comprises a fifth strain gauge, a sixth strain gauge, a seventh strain gauge and an eighth strain gauge, wherein the fifth strain gauge and the sixth strain gauge are arranged on the upper surface of the elastic body strain area at intervals along the length direction of the elastic body and are respectively symmetrical to the central positions of the first strain gauge and the second strain gauge relative to the width direction of the elastic body, the seventh strain gauge and the eighth strain gauge are arranged on the lower surface of the elastic body strain area at intervals along the length direction of the elastic body and are respectively symmetrical to the central positions of the third strain gauge and the fourth strain gauge relative to the width direction of the elastic body, the resistance value of the first strain gauge is smaller than that of the second strain gauge, the resistance value of the third strain gauge is smaller than that of the fourth strain gauge, the resistance value of the fifth strain gauge is smaller than that of the sixth strain gauge, and the resistance value of the seventh strain gauge is smaller than that of the eighth strain gauge. Preferably, the elastomer is formed by anodic oxidation of aluminum material and then processing. Preferably, the left end of the length direction of the elastic body is provided with a mounting hole and a mounting groove, the mounting hole penetrates through the upper surface and the lower surface of the elastic body, and the mounting groove is concavely arranged on the upper surface or the lower surface of the elastic body. Preferably, the right end of elastomer length direction is equipped with circuit connecting hole, first cable mounting hole, second cable mounting hole and transition hole, circuit connecting hole link up the upper surface and the lower surface of elastomer, first cable mounting hole, second cable mounting hole inwards set up at the reverse right-hand member terminal surf