Strain sensing assembly and electric push rod

Abstract

The invention relates to a strain sensing assembly and an electric push rod, the strain sensing assembly comprises a load body, a pair of strain gauges and a cable connector, the load body is provided with a cavity, an opening and a mounting cover, the cavity is communicated to the outside of the load body through the opening, a pair of detected surfaces is formed at two opposite sides of the cavity, the opening is located at one side of the cavity, and the cable connector is located at the other side of the cavity. The mounting cover is located on the other side of the cavity, the strain gauges are arranged on the detected surfaces respectively, the cable connector comprises a connector and a cable, the connector is arranged on the mounting cover, the cable is connected with the connector in a penetrating mode and electrically connected to the strain gauges, and when the load body is affected by external force, the strain gauges detect the deformation of the corresponding detected surfaces respectively; therefore, the strain sensing assembly can be independently used as a load cell or matched with an actuator for use, and is easy to mount, dismount and connect with an external wire.

Description

Technical Field

[0001] The present application relates to the technical field of electric linear actuators, and more particularly to an electric linear actuator having a strain sensing component with external wiring. Background Art

[0002] Electric linear actuators are widely used in industrial, medical, and residential applications, including beds, massage chairs, fitness equipment, rehabilitation equipment, door and window openers, and lift mechanisms. They push objects weighing tens or even thousands of kilograms to achieve lift or angle adjustments. Most existing linear actuators utilize an electric motor coupled with a transmission and reduction mechanism to rotate a lead screw, which in turn drives a threaded extension tube to linearly extend or retract.

[0003] However, electric linear actuators have a load limit, and most electric linear actuators cannot measure the weight of the load. This is especially true for industrial or agricultural linear actuators, which carry heavy loads. During use, the load limit of the linear actuator may be exceeded, which can easily cause deformation and damage to the telescopic rod or other mechanisms. Therefore, to avoid this situation, strain gauges are currently installed on the linear actuator to measure the load weight of the linear actuator. However, the signal line of the strain gauge is set inside the linear actuator, making it difficult to install and remove the strain gauge. Users are also unable to replace it according to needs or use software other than the software specified by the designer for detection.

[0004] In view of this, the applicant has focused on the shortcomings of the above-mentioned prior art and has conducted in-depth research and applied scientific theories to try his best to solve the above-mentioned problems, which has become the goal of the applicant's improvement. Summary of the Invention

[0005] The main purpose of this application is to provide a strain sensing component with external wiring, which can be used as a load cell alone or in conjunction with an electric push rod, and is easy to install and disassemble and connect external wiring.

[0006] In order to achieve the above-mentioned objectives, the present application provides a strain sensing component, including 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 connected to the outside of the load body through the opening. A pair of detection surfaces are formed on opposite sides of the chamber. The opening is located on one side of the chamber and the mounting cover is located on the other side of the chamber. Each strain gauge is respectively arranged on each detection surface. The cable connector includes a connector and a cable. The connector is arranged on the mounting cover. The cable passes through the connector and is electrically connected to each strain gauge. When the load body is affected by external force, each strain gauge respectively detects the deformation of each corresponding detection surface.

[0007] In one embodiment of the present application, the load body has a notch communicating with the cavity. The notch is formed on a portion of the periphery of the mounting cover and is located on the same side of the cavity as the mounting cover.

[0008] In one embodiment of the present application, the notch is in an inverted U shape or an arc shape.

[0009] In one embodiment of the present application, a sealing member is further included, which seals the opening and covers each strain gauge.

[0010] In one embodiment of the present application, a circuit board is further included. The circuit board is disposed in the chamber and between the strain gauges. The circuit board is electrically connected to the strain gauges and the cables.

[0011] In order to achieve the above-mentioned purpose, the present application also provides an electric push rod, including a gear box, a motor, a lead screw, a telescopic tube and a strain sensing component. The motor is connected to the gear box, a part of the lead screw is accommodated in the gear box and is driven by the motor, and the other part extends out of the gear box. The telescopic tube and the lead screw are screwed together for transmission. The strain sensing component is detachably connected to the gear box corresponding to the lead screw so that the end of the lead screw is accommodated in the load body. The strain sensing component includes a load body, a corresponding strain gauge and a cable connector. The load body has a cavity, An opening, a pair of detected surfaces and a mounting cover, the chamber is connected to the outside of the load body through the opening, the detected surfaces are arranged opposite each other in the chamber, the opening is located on one side of the chamber, and the mounting cover is located on the other side of the chamber, each strain gauge is respectively provided on each detected surface, the cable connector includes a connector and a cable, the connector is detachably provided on the mounting cover, the cable is connected to the connector and is electrically connected to each strain gauge, when the extension tube is applied with thrust and the thrust force is transmitted to the load body, each strain gauge respectively detects the deformation of the corresponding detected surface.

[0012] In one embodiment of the present application, the load body has a receiving groove and a stop ring. The receiving groove is recessed inward from one end surface of the load body, and the stop ring extends outward from the outer edge of the load body.

[0013] In one embodiment of the present application, the gearbox includes a cover having a step and a through hole. The step is formed on the periphery of the through hole, the load-bearing body passes through the through hole, the stop ring abuts the step, and the end of the lead screw is accommodated in the groove.

[0014] In one embodiment of the present application, an end cover is further included. The end cover is sleeved and fixed on the lead screw, and the stop ring is clamped and fixed between the end cover and the step.

[0015] In one embodiment of the present application, the end cover has a positioning block, the load-bearing body has an embedding groove, and the positioning block is embedded in the embedding groove.

[0016] The strain sensing assembly of the present application has an opening connected through a chamber to facilitate the installation of each strain gauge and each circuit board. The Wheatstone bridge formed by each strain gauge and each circuit board is integrated through a docking connector, and a mounting cover is provided on the side of the chamber opposite the opening for installation of a cable connector. Therefore, the signal line can be guided to the outside through the cable connector for use according to different needs and is easy to install and remove. Therefore, the strain sensing assembly can be used alone as a load cell or in conjunction with an actuator such as an electric push rod. When the load body is affected by external force, the strain gauges respectively detect the change in the resistance value of each corresponding detected surface, which is then converted into the deformation generated by each detected surface through the Wheatstone bridge. The value is transmitted to the outside via the cable connector for reading by the user or reception by the controller.

[0017] The electric linear actuator of the present application has a strain sensing component corresponding to a lead screw mounted on a gear box or the end of an inner tube. Therefore, when the telescopic tube is driven by an electric motor through a transmission mechanism to rotate the lead screw to drive the inner tube to extend relative to the outer tube, each strain gauge of the strain sensing component can respectively detect the change in resistance value of each corresponding detected surface, which is then converted into the deformation generated by each detected surface through a Wheatstone bridge circuit. This allows the user to determine the load weight borne by the telescopic tube of the electric linear actuator during the actuation process. In addition, the user can also change the position of the strain sensing component and quickly install and remove it according to different usage requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a three-dimensional appearance diagram of the load body of this application.

[0019] Figure 2 This is a three-dimensional exploded view of the strain sensing component of this application.

[0020] Figure 3 This is a three-dimensional appearance diagram of the strain sensing component of this application.

[0021] Figure 4 This is a cross-sectional side view of the strain sensing component of the present application.

[0022] Figure 5 This is a three-dimensional appearance diagram of the first embodiment of the electric linear actuator of this application.

[0023] Figure 6 This is a partial exploded perspective view of the first embodiment of the electric linear actuator of this application.

[0024] Figure 7 This is a three-dimensional exploded view of the end cover and the load body of this application.

[0025] Figure 8 This is a partial cross-sectional view of the first embodiment of the electric push rod of this application.

[0026] Figure 9 This is a top view of the second embodiment of the electric linear actuator of this application.

[0027] Description of reference numerals:

[0028] 100: strain sensing component;

[0029] 10: Load body;

[0030] 11: chamber;

[0031] 111: tested surface;

[0032] 112: configuration interface;

[0033] 12: Open your mouth;

[0034] 13: Install the cover;

[0035] 14: gap;

[0036] 15,931: perforation;

[0037] 16: container;

[0038] 17: stop ring;

[0039] 18: threaded portion;

[0040] 19: bezel;

[0041] 20: strain gauge;

[0042] 30: cable connector;

[0043] 31: connector;

[0044] 32: cable;

[0045] 40: circuit board;

[0046] 50: sealing element;

[0047] 600: gear box;

[0048] 610: base;

[0049] 620: cover;

[0050] 621: steps;

[0051] 622: through hole;

[0052] 630: transmission mechanism;

[0053] 631: end cap;

[0054] 6311: hollow disc;

[0055] 6312: hollow convex ring;

[0056] 6313: positioning block;

[0057] 632: shaft sleeve;

[0058] 633: bearing;

[0059] 700: electric motor;

[0060] 710: drive shaft;

[0061] 800: lead screw;

[0062] 900: telescopic tube;

[0063] 910: outer tube body;

[0064] 920: Inner tube body;

[0065] 930: support seat;

[0066] A: Nut. DETAILED DESCRIPTION

[0067] In the description of this application, it should be understood that the terms "front side", "rear side", "left side", "right side", "front end", "rear end", "end", "longitudinal", "lateral", "vertical", "top", "bottom", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. They do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a restriction on this application.

[0068] As used herein, terms such as "first," "second," "third," "fourth," and "fifth" describe various components, elements, regions, layers, and / or sections, which should not be limited by these terms. These terms are used only to distinguish one element, element, element, region, layer, or section from another. Unless the context clearly indicates otherwise, terms such as "first," "second," "third," "fourth," and "fifth" as used herein do not imply a sequence or order.

[0069] The detailed description and technical contents of this application will be described below with reference to the accompanying drawings. However, the accompanying drawings are for illustrative purposes only and are not intended to limit this application.

[0070] This application provides a strain sensing assembly 100, please refer to Figures 1 to 4 As shown, it mainly includes a load body 10 , a pair of strain gauges 20 and a cable connector 30 .

[0071] The load body 10 is made of a metal alloy such as stainless steel or aluminum alloy to have a certain mechanical strength, but the present application does not specifically limit the specific material of the load body 10. In this embodiment, the load body 10 is generally cylindrical along its longitudinal extension, but the present application is not limited to this. The shape of the load body 10 can be changed and adjusted accordingly as needed. The load body 10 has a chamber 11, an opening 12, a pair of detection surfaces 111 and a mounting cover 13. The chamber 11 is connected to the outside of the load body 10 through the opening 12. More specifically, the chamber 11 is a blind hole. In this embodiment, the chamber 11 has four inner wall surfaces that are perpendicular to each other, of which two opposite inner wall surfaces are detection surfaces 111, and the other two opposite inner wall surfaces (i.e., the top and bottom surfaces of the chamber 11) are configuration surfaces 112. Specifically, each detection surface 111 is relatively parallel and arranged in the chamber 11. The opening 12 is located on one side of the chamber 11 , and the mounting cover 13 is located on the other side of the chamber 11 .

[0072] The strain gauge 20 (strain gauge) includes an insulating substrate (not numbered in the figure) and a metal sensitive grid (not numbered in the figure). The strain gauge 20 is used to measure the strain of an object. When the object is deformed by an external force, the metal sensitive grid is also deformed, causing its resistance value to change accordingly. Each strain gauge 20 is respectively arranged on each detected surface 111 in the chamber 11 through the opening 12, so as to be able to measure the deformation of each detected surface 111. Specifically, the strain sensing component 100 of the present application also includes a pair of circuit boards 40. Each circuit board 40 is respectively arranged on each configuration surface 112 in the chamber 11 through the opening 12 and is located between each strain gauge 20, that is, each strain gauge 20 and each circuit board 40 are arranged perpendicularly to each other. One circuit board 40 is electrically connected in series with one strain gauge 20 to form a first half-bridge, while the other circuit board 40 is electrically connected in series with the other strain gauge 20 to form a second half-bridge. The first half-bridge and the second half-bridge are electrically connected in parallel to form a Wheatstone bridge. The Wheatstone bridge can measure the change in resistance generated by deformation of an object due to an external force and convert it into the actual strain value of the object.

[0073] The cable connector 30 includes a connector 31 and a cable 32. The connector 31 is removably mounted on the mounting cover 13. In this embodiment, the connector 31 is screwed onto the internal threads of the mounting cover 13 using external threads, but the present application is not limited to this. For example, the connector 31 may be mounted on the mounting cover 13 by means of clipping, clamping, snapping, or bonding. The cable 32 passes through the connector 31 and is electrically connected to each strain gauge 20 and each circuit board 40. Specifically, the cable 32 enters from one end of the connector 31 and exits from the other end. The cable 32 is positioned within the chamber 11 of the load body 10 and forms an electrical connection with the Wheatstone bridge. Although not shown in the drawings, those skilled in the art will appreciate that the Wheatstone bridge formed by connecting the first and second half bridges in parallel can be electrically connected to a mating connector. This allows the cable connector 30 to directly mate with the mating connector upon installation on the mounting cover 13 to achieve an electrical connection.

[0074] Thus, when the load body 10 is affected by an external force, each strain gauge 20 can detect the change in resistance of each corresponding detected surface 111 caused by slight deformation, which is then converted into the amount of deformation generated by each detected surface 111 via a Wheatstone bridge circuit. The value is then transmitted to an external display (not shown) or controller (not shown) via a cable connector 30 for user reading or reception by the controller. Furthermore, since each strain gauge 20 and each circuit board 40 can be conveniently installed within the chamber 11 via the opening 12, and the Wheatstone bridge formed by each strain gauge 20 and each circuit board 40 is integrated via a docking connector, the strain sensing assembly 100 of the present application can be connected to the outside via the cable connector 30 for use according to different needs and is easy to install and remove. Therefore, the strain sensing assembly 100 can be used alone as a load cell or in conjunction with an actuator such as an electric linear actuator to monitor its strain value.

[0075] For further explanation, refer to Figure 2As shown, the load body 10 has a notch 14 that connects to the chamber 11. Specifically, the notch 14 is formed on a portion of the periphery of the mounting cover 13 and surrounds a large portion of the connector 31 of the cable connector 30, thereby being located on the same side of the chamber 11 as the mounting cover 13. In this embodiment, the notch 14 is in an inverted U-shape, but the present application is not limited to this. For example, the notch 14 may also be in an arc shape or an inverted V shape, etc. It is worth noting that in this embodiment, the inverted U-shaped opening of the notch 14 faces one of the longitudinal ends of the load body 10. Therefore, since the notch 14 connects to the chamber 11 and is symmetrically arranged relative to the opening 12, and the inverted U-shaped opening of the notch 14 faces one of the longitudinal ends of the load body 10, when the load body 10 is affected by external forces, the opening 12 and the notch 14 can each provide space for the load body 10 to deform, thereby preventing uneven deformation of the load body 10 and effectively improving the sensing effect of each strain gauge 20.

[0076] Also, see Figures 1 to 4 As shown, the load body 10 has a through-hole 15. The through-hole 15 extends through the load body 10 to allow for the insertion of a fixing device, pin, or bolt that is used with the strain sensing assembly 100. In this embodiment, each strain gauge 20 is arranged perpendicular to the direction of the through-hole 15, but this is not a limitation. For example, each strain gauge 20 may also be arranged parallel to the direction of the through-hole 15.

[0077] Refer back Figure 3 and Figure 4 As shown, the strain sensing component 100 of the present application further includes a seal 50. The seal 50 may be an elastomer such as silicone or rubber. The seal 50 used in this embodiment is SE9176 silicone, but the present application is not limited thereto. The seal 50 blocks the opening 12, and the seal 50 covers the Wheatstone bridge formed by each strain gauge 20 and each circuit board 40 and its corresponding integrated docking connector. In other embodiments, the seal 50 may also block the gap 14, so that the chamber 11 is completely sealed and not connected to the external space. In this way, the components in the chamber 11 can be effectively protected, while the interior of the strain sensing component 100 can effectively achieve high air permeability, insulation, heat resistance, waterproof and other properties.

[0078] This application also provides an electric push rod. Please refer to Figures 5 to 8 As shown, the first embodiment of the electric push rod of the present application mainly includes a gear box 600, a motor 700, a lead screw 800, a telescopic tube 900 and the strain sensing assembly 100 as described above.

[0079] The gearbox 600 includes a base 610 , a cover 620 , and a transmission mechanism 630 . The cover 620 is fixedly mounted relative to the base 610 , and the transmission mechanism 630 is accommodated within the base 610 and the cover 620 .

[0080] The motor 700 is connected to the gear box 600. Specifically, the motor 700 is disposed on a side of the base 610 facing away from the housing 620. The motor 700 has a drive shaft 710, which is connected to the transmission mechanism 630 in a power manner.

[0081] A portion of the lead screw 800 is housed within the gearbox 600 and driven by the motor 700, while the other portion extends outside the gearbox 600. Specifically, the lead screw 800 is disposed on a side of the base 610 facing away from the housing 620, parallel to and adjacent to the motor 700. The lead screw 800 is power-coupled to the transmission mechanism 630, allowing the motor 700 to drive the lead screw 800 through the transmission mechanism 630.

[0082] The telescopic tube 900 and the lead screw 800 are threadedly connected to each other for transmission. Specifically, the telescopic tube 900 includes an outer tube body 910, an inner tube body 920, and a support base 930. The inner tube body 920 is sleeved over the outer periphery of the lead screw 800 and threadedly connected thereto. The outer tube body 910 is also sleeved along the outer periphery of the lead screw 800 for the inner tube body 920 to pass through. This allows the lead screw 800 to drive the inner tube body 920 to move axially linearly relative to the outer tube body 910 when it rotates. The support base 930 is threadedly mounted and fixed to the end of the inner tube body 920 away from the gear box 600. The support base 930 is also provided with a through-hole 931 for use with a fixing device, pin plug, or bolt that is compatible with the electric push rod.

[0083] The specific components and structure of the strain sensing assembly 100 are the same as those described above, so they will not be described here. In this embodiment, the strain sensing assembly 100 is detachably connected to the gear box 600 corresponding to the lead screw 800, so that the end of the lead screw 800 is accommodated in the load body 10. Specifically, the load body 10 has a receiving groove 16 and a stop ring 17, and the cover 620 has a step 621 and a through hole 622. Figure 2 and Figure 4 As shown, the receiving groove 16 is recessed inward from one end surface of the load body 10, and the stop ring 17 extends outward from the outer edge of the load body 10 and is located at the end surface of the load body 10 where the receiving groove 16 is formed. Figure 6 and Figure 8 As shown, the through hole 622 is provided on the housing 620 corresponding to the end of the lead screw 800, and the step 621 is formed on the periphery of the through hole 622. Figure 8 As shown, when the electric push rod is assembled, the load body 10 passes through the through hole 622 of the cover 620, so that the stop ring 17 of the load body 10 abuts against the step 621 of the cover 620, and the end of the lead screw 800 is accommodated in the groove 16 of the load body 10.

[0084] Thus, when the telescopic tube 900 is applied with thrust, that is, the motor 700 drives the lead screw 800 to rotate through the transmission mechanism 630 to drive the inner tube body 920 to extend relative to the outer tube body 910, so that the thrust force is transmitted to the load-influencing body 10, each strain gauge 20 of the strain sensing assembly 100 can respectively detect the deformation of each corresponding detected surface 111, thereby knowing the load weight borne by the electric linear actuator.

[0085] Refer back Figures 6 to 8 As shown, a threaded portion 18 is formed on a portion of the outer edge of the load body 10. A nut A can be screwed onto the threaded portion 18, thereby pressing the end surface of the nut A against the exterior of the housing 620, thereby securing the load body 10 to the housing 620. However, the present application is not limited to this embodiment; for example, the load body 10 may also be secured to the housing 620 by snapping, clamping, snapping, or bonding.

[0086] To further illustrate, the electric push rod of the present application also includes an end cover 631, a sleeve 632 and a bearing 633. The end cover 631 includes a connected hollow disk 6311 and a hollow convex ring 6312. The end cover 631 is sleeved and fixed on the lead screw 800, and the stop ring 17 is clamped and fixed between the end cover 631 and the step 621. Specifically, the bearing 633 is sleeved on the lead screw 800, and the bearing 633 is supported between the end cover 631 and the sleeve 632. The hollow disk 6311 and the hollow convex ring 6312 jointly sleeve the bearing 633, so that the stop ring 17 is clamped and fixed between the hollow disk 6311 of the end cover 631 and the step 621 of the cover 620 in the longitudinal direction, and the stop ring 17 is clamped and fixed in the vertical direction (i.e. Figure 8 The lead screw 800 is clamped and fixed between the hollow protruding ring 6312 of the end cap 631 and the housing 620 (in the vertical direction). Thus, when the electric linear actuator is mounted on a load, the load force applied to the lead screw 800 is sequentially transmitted along the sleeve 632, the bearing 633, the end cap 631, and the step 621 to the load body 10. The strain gauges 20 detect the change in resistance generated by the deformation of the load body 10, which is then converted into the deformation of each detected surface 111 via a Wheatstone bridge circuit. The value is then transmitted to the outside via the cable connector 30.

[0087] Also, see Figure 7As shown, the end cap 631 has a positioning block 6313, and the load body 10 has an embedding groove 19. The positioning block 6313 is embedded in the embedding groove 19, thereby preventing the end cap 631 from rotating relative to the load body 10. Specifically, the positioning block 6313 extends from one side of the hollow disk 6311 toward the hollow protruding ring 6312, and the embedding groove 19 is formed on the end surface of the load body 10 where the receiving groove 16 is provided. Thereby, when the positioning block 6313 is embedded in the embedding groove 19, the load body 10 can be positioned on the end cap 631 and cannot rotate, thereby effectively ensuring the sensing accuracy and stability of the strain sensing assembly 100. In this embodiment, the number of positioning blocks 6313 is two, but the present application is not limited to this. For example, the number of positioning blocks 6313 can also be one or more than three.

[0088] It is worth noting that the strain sensing assembly 100 of the electric push rod of the present application is not limited to being installed on the gear box 600. Figure 9 As shown, the second embodiment of the electric linear actuator of the present application differs primarily from the first embodiment described above in that the positions of the strain sensing assembly 100 and the support base 930 are swapped. Specifically, the strain sensing assembly 100 in this embodiment is threadedly connected to the end of the inner tube 920 via the threaded portion 18 on the outer edge of the load body 10, while the support base 930 is mounted on the housing 620 of the gear box 600. The strain sensing assembly 100 is used to monitor strain changes at the end of the inner tube 920 of the electric linear actuator. This allows users to change the position of the strain sensing assembly 100 based on different usage requirements. Alternatively, strain sensing assemblies 100 may be omitted if strain detection is not required.

[0089] The strain sensing assembly 100 of the present application has an opening 12 connected through a chamber 11 to facilitate the installation of each strain gauge 20 and each circuit board 40. The Wheatstone bridge formed by each strain gauge 20 and each circuit board 40 is integrated through a docking connector. The chamber 11 is provided with a mounting cover 13 on the side opposite the opening 12 for mounting a cable connector 30. Therefore, the signal line can be guided to the outside through the cable connector 30 for use according to different needs and is easy to install and remove. Therefore, the strain sensing assembly 100 can be used alone as a load cell or in conjunction with an actuator such as an electric push rod. When the load body 10 is affected by an external force, the strain gauges 20 respectively detect the change in the resistance value of each corresponding detected surface 111. The deformation generated by each detected surface 111 is converted into the deformation generated by the Wheatstone bridge and transmitted to the outside through the cable connector 30 for reading by the user or reception by the controller.

[0090] In the electric linear actuator of the present application, the strain sensing assembly 100 is mounted on the gear box 600 or the end of the inner tube 920 in correspondence with the lead screw 800. Therefore, when the telescopic tube 900 is rotated by the motor 700 through the transmission mechanism 630 to drive the inner tube 920 to extend relative to the outer tube 910, the strain gauges 20 of the strain sensing assembly 100 can respectively detect the change in resistance of the corresponding detected surfaces 111. This is converted into the deformation generated by each detected surface 111 via a Wheatstone bridge circuit, thereby determining the load weight borne by the telescopic tube 900 of the electric linear actuator. Furthermore, the user can also reposition the strain sensing assembly 100 and quickly install and remove it according to different usage requirements.

[0091] The foregoing disclosure is intended to enable those skilled in the art to clearly understand the technical content of this application and implement it accordingly, and is not intended to limit the scope of patent protection of this application. In addition, this application may of course have many other embodiments not listed here. Without departing from the spirit and substance of this application, those skilled in the art should be able to develop various corresponding changes and modifications based on this application, and such corresponding changes and modifications should fall within the scope of protection of the patent applied for in this application.

Claims

1. A strain sensing component, characterized in that: include: A load body having a chamber, an opening, and a mounting cover, wherein the chamber is connected to the exterior of the load body via the opening, a pair of detection surfaces are formed on opposite sides of the chamber, the opening is located on one side of the chamber, and the mounting cover is located on the other side of the chamber; a pair of strain gauges, respectively disposed on each of the detected surfaces; and A cable connector, comprising a connector and a cable, wherein the connector is disposed on the mounting cover, and the cable passes through the connector and is electrically connected to each of the strain gauges; When the load body is affected by an external force, each of the strain gauges detects the deformation of each corresponding detected surface.

2. The strain sensing assembly according to claim 1, wherein: The load body has a notch communicating with the cavity. The notch is formed on a portion of the periphery of the installation cover and is located on the same side of the cavity as the installation cover.

3. The strain sensing assembly according to claim 2, wherein: The notch is in an inverted U shape or an arc shape.

4. The strain sensing assembly according to claim 1, wherein: The invention also includes a sealing member, which blocks the opening and covers each of the strain gauges.

5. The strain sensing assembly according to claim 1, wherein: It also includes a circuit board, which is arranged in the chamber and located between the strain gauges. The circuit board is electrically connected to the strain gauges and the cables.

6. An electric push rod, characterized in that: include: Gearbox; an electric motor connected to the gear box; a lead screw, a portion of which is housed in the gear box and driven by the motor, and another portion of which extends outside the gear box; a telescopic tube, threadedly connected to the lead screw for transmission; and The strain sensing assembly according to any one of claims 1 to 5, wherein the gear box is detachably connected to the lead screw so that the end of the lead screw is accommodated in the load body; When the telescopic tube is applied with a thrust so that the thrust force is transmitted to the load body, each of the strain gauges respectively detects the deformation of each corresponding detected surface.

7. The electric linear actuator according to claim 6, wherein: The load body has a receiving groove and a stop ring. The receiving groove is recessed inward from the end surface of the load body, and the stop ring extends outward from the outer edge of the load body.

8. The electric linear actuator according to claim 7, wherein: The gear box includes a cover having a step and a through hole. The step is formed on the periphery of the through hole. The load-bearing body passes through the through hole. The stop ring abuts against the step. The end of the lead screw is accommodated in the receiving groove.

9. The electric linear actuator according to claim 8, wherein: It also includes an end cover, which is sleeved and fixed on the lead screw, and the stop ring is clamped and fixed between the end cover and the step.

10. The electric linear actuator according to claim 9, wherein: The end cover has a positioning block, the load-bearing body has an embedding groove, and the positioning block is embedded in the embedding groove.

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