Strain sensing device and electric actuator having the same
A strain sensing device includes a load body, a pair of strain gauges, and a cable connector. The load body has a chamber, an opening, and a mounting cover. The chamber is communicated to outside of the load body through the opening. A pair of detection surfaces are arranged on opposite sides of the chamber. The opening and the mounting cover are located on opposite sides of the chamber. The cable connector includes a connector head arranged on the mounting cover, and a cable threading the connector head and electrically connected to the strain gauges. When the load body is affected by an external force, the strain gauges respectively detect a deformation of the detection surfaces. The strain sensing device is therefore using alone as a load cell or in conjunction with an actuator and easily installing, disassembling and connecting an external wire.
1 . A strain sensing device, comprising:
a load body, defining a chamber and an opening and comprising a mounting cover, the chamber communicated to outside of the load body through the opening, a pair of detection surfaces arranged on opposite sides of the chamber, the opening and the mounting cover located on opposite sides of the chamber;
a pair of strain gauges, respectively arranged on each of the detection surfaces; and
a cable connector, comprising a connector head arranged on the mounting cover and a cable threading the connector head and electrically connected to the strain gauges;
wherein when the load body is affected by an external force, each of the strain gauges is configured to detect a deformation of each of the detection surfaces.
2 . The strain sensing device according to claim 1 , wherein the load body defines a notch, the notch is formed on part of a periphery of the mounting cover and located on same side of the chamber with the mounting cover.
3 . The strain sensing device according to claim 2 , wherein the notch is arc-shaped or inverted U-shaped.
4 . The strain sensing device according to claim 1 , further comprising a sealing member, the sealing member seals the opening and wraps the strain gauges.
5 . The strain sensing device according to claim 1 , further comprising a circuit board, the circuit board is arranged in the chamber and located between the strain gauges, the circuit board is electrically connected to the strain gauges and the cable.
6 . An electric actuator, comprising:
a gear box;
a motor, connected to the gear box;
a leadscrew, part of the leadscrew accommodated in the gear box and driven by the motor, the other part of the leadscrew extended outside of the gear box;
a telescopic tube, threadedly connected to the leadscrew for transmission; and
the strain sensing device according to one of claim 1 , configured to be detachably connected to the gear box such that an end of the leadscrew is accommodated in the load body;
Wherein when the telescopic tube is driven to apply a thrust force such that an acting force of the thrust force transmits to impact the load body, each of the strain gauges is configured to detect a deformation of each of the detection surfaces.
7 . The electric actuator according to claim 6 , wherein the load body defines a pit and comprises a stopping ring, the pit is recessed from an end surface of the load body, the stopping ring extends outward from an outer edge of the load body.
8 . The electric actuator according to claim 7 , wherein the gear box comprises a cover shell, the cover shell comprises a step and defines a through hole, the step is formed on a periphery of the through hole, the load body penetrates the through hole, the stopping ring abuts against the step, the end of the leadscrew accommodated in the pit.
9 . The electric actuator according to claim 8 , further comprising an end cap, the end cap is sleeved and fixed on the leadscrew, the stopping ring is clamped and fixed between the end cap and the step.
10 . The electric actuator according to claim 9 , wherein the end cap comprises a positioning block, the load body comprises an embedded groove, the positioning block is embedded in the embedded groove.
11 . The electric actuator according to claim 6 , wherein the load body defines a notch, the notch is formed on part of a periphery of the mounting cover and located on same side of the chamber with the mounting cover.
12 . The electric actuator according to claim 11 , wherein the notch is arc-shaped or inverted U-shaped.
13 . The electric actuator according to claim 6 , further comprising a sealing member, the sealing member seals the opening and wraps the strain gauges.
14 . The electric actuator according to claim 6 , further comprising a circuit board, the circuit board is arranged in the chamber and located between the strain gauges, the circuit board is electrically connected to the strain gauges and the cable.