A dynamic tensile testing device for high-elasticity fabric

Abstract

The utility model belongs to high elasticity fiber fabric dynamic tensile test field, concretely, relate to a kind of high elasticity fiber fabric dynamic tensile test device. Including: support assembly;Jig assembly, jig assembly with support assembly detachable fixed connection;Stretching control component, stretching control component includes controller, screw unit, distance sensor, tension sensor;Controller, screw unit respectively with support assembly detachable fixed connection;Distance sensor, screw unit, tension sensor respectively with the controller electric connection;Distance sensor and screw unit detachable fixed connection;Tension sensor along its height direction one end and screw unit fixed connection, other end and jig assembly can fixed connection. Thus it has solved the existing tensile machine to be difficult to test high elasticity fiber fabric under different tensile force the length that can be stretched and the number of times of stretching to judge whether high elasticity fiber fabric meets the requirement problem.

Description

Technical Field

[0001] This utility model belongs to the field of dynamic tensile testing of high elastic fiber fabrics, and specifically relates to a dynamic tensile testing device for high elastic fiber fabrics. Background Technology

[0002] High-elasticity fiber fabric, as the name suggests, refers to a type of textile fabric with high elasticity and resilience. It can be stretched significantly under external force and quickly returns to its original shape and size after the force is released, with almost no permanent deformation. Before high-elasticity fiber fabrics are marketed, tensile tests are required to verify whether their elasticity meets actual needs. Currently, most high-elasticity fiber fabrics undergo a single tensile fracture test on sample fabrics before being released to the market, without simulating the number of stretches the fabric can undergo under different tensile forces. Since high-elasticity fiber fabrics undergo multiple stretching and contraction processes under different tensile forces during actual use, ultimately resulting in damage, it is a dynamic stretching process. Therefore, testing the length of stretch and the number of stretches a high-elasticity fiber fabric can undergo under different tensile forces is crucial for determining whether the fabric meets the requirements. Utility Model Content

[0003] To address the problem that existing tensile testing machines are insufficient for measuring the length and number of stretches a high-elasticity fiber fabric can undergo under different tensile forces, thus hindering the determination of whether the fabric meets requirements, this invention provides a dynamic tensile testing device for high-elasticity fiber fabrics, comprising: Support components; A clamping assembly, wherein the clamping assembly is detachably and fixedly connected to the support assembly; A tension control assembly includes a controller, a lead screw unit, a distance sensor, and a tension sensor. The controller and the lead screw unit are detachably and fixedly connected to a support assembly. The distance sensor, the lead screw unit, and the tension sensor are electrically connected to the controller. The distance sensor is detachably and fixedly connected to the lead screw unit. One end of the tension sensor along its height direction is fixedly connected to the lead screw unit, and the other end is fixedly connected to the clamp assembly. The tension sensor and the distance sensor are spaced apart. The clamp assembly and the support assembly are spaced apart from the distance sensor.

[0004] In some embodiments, the lead screw unit includes a lead screw body and a slider; the fixed end of the lead screw body is detachably and fixedly connected to the support assembly; the output end of the lead screw body is connected to the slider; the drive end of the lead screw body is electrically connected to the controller; the distance sensor is detachably and fixedly connected to the slider; and the tension sensor is fixedly connected to the slider.

[0005] In some embodiments, the clamping assembly includes a first clamping unit and a second clamping unit; the first clamping unit is detachably and fixedly connected to the support assembly; the second clamping unit is fixedly connected to the tension sensor; the first clamping unit and the second clamping unit are spaced apart along their height direction.

[0006] In some embodiments, the first clamping unit includes a first clamping seat, a first clamping plate, a first screw, and a first rotating rod; one end of the first clamping seat along its height direction is detachably fixedly connected to the support assembly, and the other end is threadedly connected to the outer peripheral surface of the first screw; one end of the first screw along its axial direction is rotatably connected to the first clamping plate via a bearing, and the other end is connected to the outer peripheral surface of the first rotating rod; the first clamping plate is movably connected to the first clamping seat; the first clamping seat and the second clamping unit are spaced apart along their height direction.

[0007] In some embodiments, the second clamping unit includes a second clamping seat, a second clamping plate, a second screw, and a second rotating rod; one end of the second clamping seat along its height direction is fixedly connected to the end of the tension sensor away from the slider, and the other end is threadedly connected to the outer peripheral surface of the second screw; one end of the second screw along its axial direction is rotatably connected to the second clamping plate through a bearing, and the other end is connected to the outer peripheral surface of the second rotating rod; the second clamping plate is movably connected to the second clamping seat; the first clamping seat and the second clamping seat are spaced apart along their height direction; the first clamping plate and the second clamping plate are spaced apart along their height direction.

[0008] In some embodiments, the first clamp includes a first connecting portion, a first abutting portion, and a first threaded portion; one end of the first connecting portion along its height is detachably fixedly connected to the support assembly, and the other end is fixedly connected to the first abutting portion and the first threaded portion; the first abutting portion and the first threaded portion are spaced apart; an anti-slip groove is provided at one end of the first abutting portion near the first threaded portion; the outer peripheral surface of the first screw is threadedly connected to the first threaded portion; the first clamping plate is located between the first abutting portion and the first threaded portion; a groove is provided at one end of the first clamping plate near the first abutting portion.

[0009] In some embodiments, the second clamp includes a second connecting portion, a second abutting portion, and a second threaded portion; one end of the second connecting portion along its height is fixedly connected to a tension sensor, and the other end is fixedly connected to the second abutting portion and the second threaded portion; the second abutting portion and the second threaded portion are spaced apart; an anti-slip groove is provided at one end of the second abutting portion near the second threaded portion; the outer circumferential surface of the second screw is threadedly connected to the second threaded portion; the second clamping plate is located between the second abutting portion and the second threaded portion; a groove is provided at one end of the second clamping plate near the second abutting portion.

[0010] In some embodiments, the support assembly includes a first support portion and a second support portion; one end of the second support portion along its height direction is fixedly connected to one end of the first support portion along its height direction; the first connecting portion and the controller are respectively detachably fixedly connected to one end face of the first support portion along its height direction, wherein the end faces of the first connecting portion and the second support portion connected to the first support portion are the same; the first connecting portion and the controller are respectively spaced apart from the second support portion; and the fixed end of the lead screw body is fixedly connected to the second support portion.

[0011] To address the problem that existing stretching machines are insufficient for testing the length and number of stretches a high-elasticity fiber fabric can undergo under different tensile forces, thus hindering the determination of whether the fabric meets requirements, this invention offers the following advantages: By setting up a clamping assembly and a stretching control assembly, the stretching control assembly includes a controller, a lead screw unit, a distance sensor, and a tension sensor. The controller and lead screw unit are detachably and fixedly connected to the support assembly. The distance sensor, lead screw unit, and tension sensor are electrically connected to the controller. When performing dynamic stretching tests on high-elasticity fiber fabrics, the controller can control the lead screw unit to drive the clamping unit to stretch the high-elasticity fiber fabric. The tension sensor can transmit the force of the high-elasticity fiber fabric during stretching to the controller, and the distance sensor can calculate the stretching length of the high-elasticity fiber fabric. By controlling the lead screw unit to reciprocate and drive the clamping unit to stretch the fabric under a predetermined force, the controller can calculate the maximum number of stretching cycles of the high-elasticity fiber fabric and the stretching length under a predetermined tension. This solves the problem that existing stretching machines are unable to test the stretching length and number of stretches of high-elasticity fiber fabrics under different tensions to determine whether the high-elasticity fiber fabric meets the requirements. Attached Figure Description

[0012] Figure 1 A schematic diagram of a planar structure for a dynamic tensile testing device for highly elastic fiber fabrics; Figure 2 A three-dimensional view of a dynamic tensile testing device for a highly elastic fiber fabric; Figure 3 A three-dimensional view of a dynamic tensile testing device for a highly elastic fiber fabric; Figure 4 for Figure 2 A magnified view of a portion of point A in the middle.

[0013] In the diagram: 100 - Support assembly; 110 - First support part; 120 - Second support part; 200 - Clamp assembly; 210 - First clamp unit; 211 - First clamp seat; 2111 - First connecting part; 2112 - First abutting part; 2113 - First threaded part; 212 - First clamping plate; 213 - First screw; 214 - First rotating rod; 220 - Second clamp unit; 221 - Second clamp seat; 2211 - Second connecting part; 2212 - Second abutting part; 2213 - Second threaded part; 222 - Second clamping plate; 223 - Second screw; 224 - Second rotating rod; 230 - High-elasticity fiber fabric; 300 - Tension control assembly; 310 - Controller; 320 - Lead screw unit; 321 - Lead screw body; 322 - Slider; 330 - Distance sensor; 340 - Tension sensor. Detailed Implementation

[0014] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, and are not intended to imply any limitation on the scope of the disclosure.

[0015] As used herein, the term "comprising" and its variations are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments and are not intended to limit the indicated devices, elements, or components to having a specific orientation or being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientations or positional relationships; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances. In addition, the terms "installed", "set up", "equipped with", "connected", and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, the terms "first," "second," etc., are mainly used to distinguish different devices, elements, or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0016] This embodiment discloses a dynamic tensile testing device for a high-elasticity fiber fabric 230, such as... Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, it may include: A support assembly 100; a clamp assembly 200; and a tension control assembly 300 are included. The clamp assembly 200 is detachably and fixedly connected to the support assembly 100. The tension control assembly 300 includes a controller 310, a lead screw unit 320, a distance sensor 330, and a tension sensor 340. The controller 310 and the lead screw unit 320 are detachably and fixedly connected to the support assembly 100. The distance sensor 330, the lead screw unit 320, and the tension sensor 340 are electrically connected to the controller 310. The distance sensor 330 is detachably and fixedly connected to the lead screw unit 320. One end of the tension sensor 340 along its height direction is fixedly connected to the lead screw unit 320, and the other end is detachably and fixedly connected to the clamp assembly 200. The tension sensor 340 and the distance sensor 330 are spaced apart. The clamp assembly 200 and the support assembly 100 are spaced apart from the distance sensor 330.

[0017] In this embodiment, a clamp assembly 200 and a tension control assembly 300 are provided. The tension control assembly 300 includes a controller 310, a lead screw unit 320, a distance sensor 330, and a tension sensor 340. The controller 310 and the lead screw unit 320 are detachably and fixedly connected to the support assembly 100. The distance sensor 330, the lead screw unit 320, and the tension sensor 340 are electrically connected to the controller 310. When performing a dynamic tension test on the high-elasticity fiber fabric 230, the controller 310 can control the lead screw unit 320 to drive the clamp unit to stretch the high-elasticity fiber fabric 230. The tension sensor 340 can transmit the force of the high-elasticity fiber fabric 230 during tension to the controller 310. The distance sensor 330 can calculate the tensile length of the high-elasticity fiber fabric 230. The controller 310 controls the lead screw unit 320 to reciprocate and drive the clamp. The unit stretches the fabric under a predetermined force, and can calculate the maximum number of stretches of the high-elasticity fiber fabric 230 and the stretch length under a predetermined tension. This solves the problem that existing stretching machines are unable to test the stretch length and number of stretches of the high-elasticity fiber fabric 230 under different tensions, thus determining whether the high-elasticity fiber fabric 230 meets the requirements. In this embodiment, the distance sensor 330 can be selected as a laser rangefinder or an ultrasonic rangefinder as needed. The tension sensor 340 can be understood as a weighing sensor. Since the above two sensors are existing technologies, their specific structures will not be described in detail. In this embodiment, the controller 310 can be a single-chip microcomputer controller 310 or a PLC controller 310. The controller 310 has a touch screen for controlling the lead screw unit 320. The stroke of the lead screw unit 320 can be controlled or set from the touch screen.

[0018] In some embodiments of this utility model, such as Figure 1 , Figure 2 As shown, the lead screw unit 320 includes a lead screw body 321 and a slider 322; the fixed end of the lead screw body 321 is detachably and fixedly connected to the support assembly 100; the output end of the lead screw body 321 is connected to the slider 322; the drive end of the lead screw body 321 is electrically connected to the controller 310; the distance sensor 330 is detachably and fixedly connected to the slider 322; and the tension sensor 340 is fixedly connected to the slider 322.

[0019] In this embodiment, the driving end of the lead screw body 321 can be a servo motor. The controller 310 can make the slider 322 slide back and forth by rotating the lead screw motor forward or backward, thereby simulating a process of repeatedly stretching the high elastic fiber fabric 230. The distance sensor 330 and the tension sensor 340 can detect the length of the high elastic fiber fabric 230 being stretched and the force at that length. The change in force can be used to determine the tensile fatigue resistance of the high elastic fiber fabric 230. It is conceivable that when the high elastic fiber fabric 230 is stretched a certain number of times, its tensile strength may change, thereby causing the magnitude of the force detected by the tension sensor 340 to change.

[0020] In some embodiments, such as Figure 2 , Figure 3 As shown, the clamp assembly 200 includes a first clamp unit 210 and a second clamp unit 220; the first clamp unit 210 is detachably and fixedly connected to the support assembly 100; the second clamp unit 220 is fixedly connected to the tension sensor 340; the first clamp unit 210 and the second clamp unit 220 are spaced apart along their height direction.

[0021] The first clamping unit 210 includes a first clamping seat 211, a first clamping plate 212, a first screw 213, and a first rotating rod 214. One end of the first clamping seat 211 along its height direction is detachably fixedly connected to the support assembly 100, and the other end is threadedly connected to the outer peripheral surface of the first screw 213. One end of the first screw 213 along its axis direction is rotatably connected to the first clamping plate 212 through a bearing, and the other end is connected to the outer peripheral surface of the first rotating rod 214. The first clamping plate 212 is movably connected to the first clamping seat 211. The first clamping seat 211 and the second clamping unit 220 are spaced apart along their height direction.

[0022] The second clamping unit 220 includes a second clamping seat 221, a second clamping plate 222, a second screw 223, and a second rotating rod 224. One end of the second clamping seat 221 along its height direction is fixedly connected to the end of the tension sensor 340 away from the slider 322, and the other end is threadedly connected to the outer peripheral surface of the second screw 223. One end of the second screw 223 along its axial direction is rotatably connected to the second clamping plate 222 through a bearing, and the other end is connected to the outer peripheral surface of the second rotating rod 224. The second clamping plate 222 is movably connected to the second clamping seat 221. The first clamping seat 211 and the second clamping seat 221 are spaced apart along their height direction. The first clamping plate 212 and the second clamping plate 222 are spaced apart along their height direction.

[0023] The first clamp 211 includes a first connecting portion 2111, a first abutting portion 2112, and a first threaded portion 2113; one end of the first connecting portion 2111 is detachably and fixedly connected to the support assembly 100 along its height, and the other end is fixedly connected to the first abutting portion 2112 and the first threaded portion 2113; the first abutting portion 2112 and the first threaded portion 2113 are spaced apart; an anti-slip groove is provided at one end of the first abutting portion 2112 near the first threaded portion 2113; the outer peripheral surface of the first screw 213 is threadedly connected to the first threaded portion 2113; the first clamping plate 212 is located between the first abutting portion 2112 and the first threaded portion 2113; a groove is provided at one end of the first clamping plate 212 near the first abutting portion 2112.

[0024] The second clamp 221 includes a second connecting portion 2211, a second abutting portion 2212, and a second threaded portion 2213; one end of the second connecting portion 2211 along its height is fixedly connected to the tension sensor 340, and the other end is fixedly connected to the second abutting portion 2212 and the second threaded portion 2213; the second abutting portion 2212 and the second threaded portion 2213 are spaced apart; an anti-slip groove is provided at one end of the second abutting portion 2212 near the second threaded portion 2213; the outer peripheral surface of the second screw 223 is threadedly connected to the second threaded portion 2213; the second clamping plate 222 is located between the second abutting portion 2212 and the second threaded portion 2213; a groove is provided at one end of the second clamping plate 222 near the second abutting portion 2212.

[0025] In this embodiment, by rotating the first rotating rod 214 and the second rotating rod 224, the first screw 213 and the second screw 223 can respectively push the first clamping plate 212 and the second clamping plate 222 away from or close to the first abutting part 2112 and the second abutting part 2212. When the first clamping plate 212 moves close to the first abutting part 2112, it can clamp one end of the high-elasticity fiber fabric 230. When the second clamping plate 222 moves close to the second abutting part 2212, it can clamp the other end of the high-elasticity fiber fabric 230. In this embodiment, in order to enable the first clamping plate 212 and the second clamping plate 222 to move in a straight line, a sliding groove can be provided at the first connecting part 2111 between the first threaded part 2113 and the first abutting part 2112, and a part of the first clamping plate 212 can extend into the sliding groove, so that the first clamping plate 212 can move close to or away from the first abutting part 2112 in a straight line. Similarly, the second clamping plate 222 can also move in the same way.

[0026] In some embodiments of this utility model, such as Figure 1 , Figure 2 As shown in Figure 3, the support assembly 100 includes a first support portion 110 and a second support portion 120; one end of the second support portion 120 along its height direction is fixedly connected to one end of the first support portion 110 along its height direction; the first connecting portion 2111 and the controller 310 are respectively detachably fixedly connected to one end face of the first support portion 110 along its height direction, wherein the end faces of the first connecting portion 2111 and the second support portion 120 connected to the first support portion 110 are the same; the first connecting portion 2111 and the controller 310 are respectively spaced apart from the second support portion 120; the fixed end of the lead screw body 321 is fixedly connected to the second support portion 120.

[0027] The working principle of this utility model is as follows: When a dynamic tensile test is required on the high-elasticity fiber fabric 230, the high-elasticity fiber fabric 230 is clamped by the first clamping unit 210 and the second clamping unit 220, and a tension is set from the control point. Subsequently, the controller 310 controls the lead screw unit 320 to drive the second clamping unit 220 to move and stretch the high-elasticity fiber fabric 230. When the high-elasticity fiber fabric 230 begins to be stretched, the tension sensor 340 transmits the tension to the controller 310 as F1, and the distance sensor 330 measures the distance between the slider 322 and the first support 110 as S1. The second clamping unit 220 then moves to stretch the high-elasticity fiber fabric. 230, until the force transmitted by the tension sensor 340 is F2 (predetermined force), at which point the distance measured by the distance sensor 330 is S2, then the stretching distance S of the high elastic fiber fabric 230 is S2-S1; subsequently, the controller 310 controls the lead screw unit 320 to drive the second clamping unit 220 to approach the first clamping unit 210 and move within a distance of S. The second clamping unit 220 moves back and forth continuously within a distance of S until a predetermined number of times is reached. By observing the change in tension transmitted by the tension sensor 340, it is determined whether the change in elasticity of the high elastic fiber fabric 230 within the predetermined number of stretching times meets the requirements.

[0028] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes can be made in form and detail without departing from the spirit and scope of this disclosure.

Claims

1. A dynamic tensile testing device for high-elasticity fiber fabrics, characterized in that, include: Support components; A clamping assembly, wherein the clamping assembly is detachably and fixedly connected to the support assembly; A tension control assembly includes a controller, a lead screw unit, a distance sensor, and a tension sensor. The controller and the lead screw unit are detachably and fixedly connected to a support assembly. The distance sensor, the lead screw unit, and the tension sensor are electrically connected to the controller. The distance sensor is detachably and fixedly connected to the lead screw unit. One end of the tension sensor along its height direction is fixedly connected to the lead screw unit, and the other end is fixedly connected to the clamp assembly. The tension sensor and the distance sensor are spaced apart. The clamp assembly and the support assembly are spaced apart from the distance sensor.

2. The dynamic tensile testing device for high-elasticity fiber fabrics according to claim 1, characterized in that, The lead screw unit includes a lead screw body and a slider; the fixed end of the lead screw body is detachably and fixedly connected to the support assembly; the output end of the lead screw body is connected to the slider; the drive end of the lead screw body is electrically connected to the controller; the distance sensor is detachably and fixedly connected to the slider; and the tension sensor is fixedly connected to the slider.

3. The dynamic tensile testing device for high-elasticity fiber fabrics according to claim 2, characterized in that, The clamping assembly includes a first clamping unit and a second clamping unit; the first clamping unit is detachably and fixedly connected to the support assembly; the second clamping unit is fixedly connected to the tension sensor; the first clamping unit and the second clamping unit are spaced apart along their height direction.

4. The dynamic tensile testing device for high-elasticity fiber fabrics according to claim 3, characterized in that, The first clamping unit includes a first clamping seat, a first clamping plate, a first screw, and a first rotating rod; one end of the first clamping seat along its height direction is detachably fixedly connected to the support assembly, and the other end is threadedly connected to the outer peripheral surface of the first screw; one end of the first screw along its axis direction is rotatably connected to the first clamping plate through a bearing, and the other end is connected to the outer peripheral surface of the first rotating rod; the first clamping plate is movably connected to the first clamping seat; the first clamping seat and the second clamping unit are spaced apart along their height direction.

5. The dynamic tensile testing device for high-elasticity fiber fabric according to claim 4, characterized in that, The second clamping unit includes a second clamping seat, a second clamping plate, a second screw, and a second rotating rod; one end of the second clamping seat along its height direction is fixedly connected to the end of the tension sensor away from the slider, and the other end is threadedly connected to the outer peripheral surface of the second screw; one end of the second screw along its axial direction is rotatably connected to the second clamping plate through a bearing, and the other end is connected to the outer peripheral surface of the second rotating rod; the second clamping plate is movably connected to the second clamping seat; the first clamping seat and the second clamping seat are spaced apart along their height direction; the first clamping plate and the second clamping plate are spaced apart along their height direction.

6. The dynamic tensile testing device for high-elasticity fiber fabric according to claim 5, characterized in that, The first clamp includes a first connecting portion, a first abutting portion, and a first threaded portion; one end of the first connecting portion along its height is detachably and fixedly connected to the support assembly, and the other end is fixedly connected to the first abutting portion and the first threaded portion; the first abutting portion and the first threaded portion are spaced apart; an anti-slip groove is provided at one end of the first abutting portion near the first threaded portion; the outer circumferential surface of the first screw is threadedly connected to the first threaded portion; the first clamping plate is located between the first abutting portion and the first threaded portion; a groove is provided at one end of the first clamping plate near the first abutting portion.

7. The dynamic tensile testing device for high-elasticity fiber fabric according to claim 6, characterized in that, The second clamp includes a second connecting part, a second abutting part, and a second threaded part; one end of the second connecting part along its height is fixedly connected to a tension sensor, and the other end is fixedly connected to the second abutting part and the second threaded part; the second abutting part and the second threaded part are spaced apart; an anti-slip groove is provided at one end of the second abutting part near the second threaded part; the outer circumferential surface of the second screw is threadedly connected to the second threaded part; the second clamping plate is located between the second abutting part and the second threaded part; a groove is provided at one end of the second clamping plate near the second abutting part.

8. The dynamic tensile testing device for high-elasticity fiber fabrics according to claim 7, characterized in that, The support assembly includes a first support portion and a second support portion; one end of the second support portion along its height direction is fixedly connected to one end of the first support portion along its height direction; the first connecting portion and the controller are respectively detachably fixedly connected to one end face of the first support portion along its height direction, wherein the end faces of the first connecting portion and the second support portion connected to the first support portion are the same; the first connecting portion and the controller are respectively spaced apart from the second support portion; the fixed end of the lead screw body is fixedly connected to the second support portion.

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