A multi-station creep tensile testing machine and a control method thereof

Abstract

The application relates to the field of crosslinked material testing, and discloses a multi-station creep tensile testing machine and a control method thereof. Through the arrangement of a connecting rod mechanism, a load is loaded on a cross arm through a steel cable, and the load on the cross arm acts on a vertical arm. The vertical arm can always keep parallel with a fixing frame. The force of the vertical arm on a main driving arm and a vice driving arm is always kept on the central axis of the vertical arm, so that the force arm of the load on both sides of the fixing frame remains unchanged and is not affected by the change of the position and direction of the load force, thereby guaranteeing the stability of the load during the loading process of the test piece. Through the arrangement of multiple test stations, multiple test pieces are independently tested and do not affect each other, so that the test of multiple test pieces can be completed on the same rack, the material test efficiency is improved, and the mechanical structure disclosed by the application occupies a small floor space and reduces the cost investment of the testing machine.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of crosslinked material testing, and more particularly to a multi-station creep tensile testing machine and a control method thereof. BACKGROUND

[0002] Crosslinked materials have crosslinking structures, which are also called network structures, three-dimensional network structures in the molecular chains of high molecular compounds, such as vulcanized rubber, molded products of unsaturated polyolefin resins, epoxy resins, phenolic resins, and phenolic resins after curing, and other thermosetting plastics. At present, for creep constant load tensile experiments, electronic universal testing machines are generally used for creep research. However, due to the long single test cycle and high cost, the existing technology has the above-mentioned defects. SUMMARY

[0003] In view of the deficiencies in the prior art, the present application aims to provide a multi-station creep tensile testing machine and a control method thereof, which overcomes the above-mentioned defects in the prior art and has the characteristic of low testing cost.

[0004] To achieve the first object of the present application, the present application provides the following technical solutions:

[0005] A multi-station creep tensile testing machine, comprising a rack, wherein the rack is provided with

[0006] A connecting rod mechanism, comprising a fixed frame, a main drive arm, a secondary drive arm, two vertical arms and two horizontal arms, the fixed frame is fixedly connected with the rack, the main drive arm and the secondary drive arm are arranged in parallel and are respectively hingedly connected with the fixed frame, the two vertical arms are arranged in parallel with the fixed frame, one end of the vertical arm is hingedly connected with the main drive arm, the other end of the vertical arm is hingedly connected with the secondary drive arm, the horizontal arms are arranged on both sides of the vertical arms, and the vertical arms and the horizontal arms are in one-to-one correspondence and fixedly connected, one of the horizontal arms is loaded with a weight through a steel cable, and the other horizontal arm is used for hanging a test piece,

[0007] A test piece hanging mechanism, which is used for installing a test piece and is hung on one of the horizontal arms through a steel cable,

[0008] A displacement sensor, which is arranged between the connecting rod mechanism and the test piece hanging mechanism and is used for measuring the change in length of the test piece.

[0009] In the application, preferably, the test piece mounting mechanism comprises a mounting base, a tension sensor and two test piece mounting seats, the mounting base is fixedly connected with the rack, the two test piece mounting seats are arranged at intervals, a connecting hole is formed in each test piece mounting seat, a quick-mounting bolt is threadedly connected to the test piece mounting seat, one end of the tension sensor is fixedly connected with the mounting base, the other end of the tension sensor is fixedly connected with a connecting pin, the connecting pin penetrates through the mounting base and is connected with one of the test piece mounting seats to transmit the tension to the tension sensor.

[0010] In the application, preferably, a test piece anti-rotation mechanism is arranged between the displacement sensor and the test piece mounting mechanism, the test piece anti-rotation mechanism comprises a mounting bracket, a sliding shaft and a connecting plate, the mounting bracket is fixedly connected with the rack, the sliding shaft is slidably connected with the mounting bracket, the connecting plate is fixedly connected with the sliding shaft, the number of the sliding shafts is at least two to limit the rotation of the connecting plate, and the other test piece mounting seat is mounted on the connecting plate.

[0011] In the application, preferably, the displacement sensor comprises a sensor base and a sensor sliding block, the sensor base is fixedly connected with the mounting bracket, the sensor sliding block is slidably connected with the sensor base, the sliding direction of the sensor sliding block is parallel to the sliding direction of the sliding shaft, a pull rod is connected to the sensor sliding block, and the other end of the pull rod is mounted on the connecting plate to make the connecting plate and the sensor sliding block slide synchronously.

[0012] In the application, preferably, the connecting rod mechanism is provided with a weight loading mechanism on the side away from the test piece mounting mechanism, the weight loading mechanism comprises a weight fixing rod, a weight bolt and a weight box, a steel cable connecting hole is reserved at the upper end of the weight fixing rod, the weight box is arranged on the weight fixing rod and used for placing small-size weights, a weight fixing hole is formed in the weight fixing rod, and the weight bolt penetrates through a large-size weight and is threadedly connected with the weight fixing hole to fix the large-size weight.

[0013] In the application, preferably, a weight lifting mechanism is arranged below the weight loading mechanism, the weight lifting mechanism comprises a lifting platform, a cross arm and a driving member, the lifting platform is provided with a weight placing area, the cross arm is arranged between the lifting platform and the rack and provides support for the lifting platform, and the driving member is arranged as a linear driving member to drive the lifting platform to lift and lower.

[0014] In the present application, preferably, the rack is provided with a plurality of test stations, each test station is arranged along the length direction of the rack, the connecting rod mechanism, the displacement sensor and the test piece mounting mechanism correspond to the test stations one by one, the main driving arm is arranged along the width direction of the rack, and the length from the vertical arm close to the displacement sensor to the fixing frame is less than the length from the vertical arm away from the displacement sensor to the fixing frame.

[0015] In the present application, preferably, two steel cable guide frames are arranged below the connecting rod mechanism, the steel cable guide frames are fixedly connected with the rack and correspond to the cross arms one by one, the steel cable guide frames are provided with limiting supports and guide wheels, each guide wheel corresponds to two limiting supports respectively, the two limiting supports are oppositely arranged and fixedly connected with the steel cable guide frame, and the guide wheel is rotatably installed between the two limiting supports to limit the position of the steel cable.

[0016] In the present application, preferably, the zero adjustment weight is detachably connected to the cross arm.

[0017] To achieve the second object of the present application, the present application provides the following technical scheme.

[0018] A control method of a multi-station creep tensile testing machine, which provides a multi-station creep tensile testing machine, including a rack, the rack is provided with

[0019] a connecting rod mechanism, the connecting rod mechanism includes a fixing frame, a main driving arm, a vice driving arm, two vertical arms and two cross arms, the fixing frame is fixedly connected with the rack, the main driving arm and the vice driving arm are arranged in parallel and are mutually hinged with the fixing frame respectively, the two vertical arms are arranged in parallel with the fixing frame respectively, one end of the vertical arm is mutually hinged with the main driving arm, the other end of the vertical arm is mutually hinged with the vice driving arm, the cross arm is arranged on both sides of the vertical arm, and the vertical arm and the cross arm correspond to and are fixedly connected with each other, and the other cross arm is used for mounting a test piece,

[0020] a test piece mounting mechanism, the test piece mounting mechanism is used for mounting a test piece and is hung on one of the cross arms through a steel cable, the test piece mounting mechanism is provided with a tension sensor,

[0021] a displacement sensor, the displacement sensor is arranged between the connecting rod mechanism and the test piece mounting mechanism and is used for measuring the change in length of the test piece,

[0022] a weight loading mechanism, the weight loading mechanism is arranged on the side of the connecting rod mechanism away from the test piece mounting mechanism, the weight loading mechanism and the cross arm are connected through a steel cable,

[0023] a weight lifting mechanism, the weight lifting mechanism is arranged below the weight loading mechanism.

[0024] The control method comprises the following steps:

[0025] S1, select the combination of large and small specifications of the weight and set it on the weight lifting mechanism and lift it to the weight loading mechanism;

[0026] S2, the large and small specifications of the weight are fixed on the weight loading mechanism after being lifted, and the workpiece is clamped on the weight loading mechanism;

[0027] S3, the weight lifting mechanism is lowered to the steel cable tensioning, the displacement sensor collects the displacement length according to the preset sampling frequency, and the tension sensor measures the force value in real time.

[0028] The beneficial effects of the present application are:

[0029] 1, through the setting of the connecting rod mechanism, the load is loaded on the horizontal arm through the steel cable, and the load on the horizontal arm acts on the vertical arm, the vertical arm can always keep parallel with the fixed frame, the force of the vertical arm on the main drive arm and the auxiliary drive arm always keeps in the vertical arm shaft, thereby the force arm of the load on both sides of the fixed frame remains unchanged, and is not affected by the position and direction of the load force, thereby ensuring the stability of the load during the loading process of the test piece;

[0030] 2, through the setting of multiple test stations, multiple test pieces are tested independently and do not affect each other, so that multiple test pieces can be tested on the same rack, the material test efficiency is improved, and the mechanical structure involved in the present application occupies small space, and the cost investment of the testing machine is reduced;

[0031] 3, through the setting of the steel cable guide frame and the test piece anti-rotation mechanism, the deformation process of the test piece is guided, the influence caused by the change of material stress in the deformation process is avoided, and the stability of the test piece under the tension is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is the overall structure schematic diagram of the present application;

[0033] Figure 2 is the structure schematic diagram of the connecting rod mechanism in the present application;

[0034] Figure 3 is the structure schematic diagram of the steel cable guide frame in the present application;

[0035] Figure 4 is the overall schematic diagram of the displacement sensor and the test piece anti-rotation mechanism in the present application;

[0036] Figure 5 is the structure schematic diagram of the test piece mounting mechanism in the present application;

[0037] Figure 6Fig. 1 is a sectional view of a test piece mounting mechanism according to the present application;

[0038] Figure 7 Fig. 2 is a schematic view of the overall structure of a weight loading mechanism according to the present application;

[0039] Figure 8 Fig. 3 is a schematic view of the overall structure of a weight lifting mechanism according to the present application.

[0040] Reference numerals:

[0041] 1, connecting rod mechanism; 11, fixed frame; 12, main drive arm; 13, auxiliary drive arm; 14, vertical arm; 15, cross arm; 16, fixed block; 17, zero adjustment weight; 2, steel cable; 3, steel cable guide frame; 31, limiting support; 32, guide wheel; 4, displacement sensor; 41, sensor base; 42, sensor slider; 43, pull rod; 5, test piece anti-rotation mechanism; 51, mounting support; 52, sliding shaft; 53, connecting plate; 6, test piece mounting mechanism; 61, mounting base; 62, tension sensor; 63, test piece mounting seat; 64, quick-mounting bolt; 7, top mounting frame; 8, weight loading mechanism; 81, weight fixing rod; 82, small weight group; 53, weight box; 84, large weight group; 85, weight bolt; 9, weight lifting mechanism; 91, lifting platform; 92, drive member; 93, cross arm; 10, rack. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0043] It should be noted that when a component is referred to as being "fixed" to another component, it can be directly on the other component or there can be intervening components. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or there can be intervening components. When a component is referred to as being "disposed" on another component, it can be directly on the other component or there can be intervening components. The terms "vertical", "horizontal", "left", "right", and similar expressions used herein are for illustrative purposes only.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0045] Embodiment 1:

[0046] Please refer to Figures 1 to 8 The embodiment provides a multi-station creep tensile testing machine, which comprises a rack 10, a top mounting frame 7 fixedly connected to the upper portion of the rack 10, a plurality of test stations arranged on the rack 10, and the test stations arranged along the length direction of the rack 10. The plurality of test stations are arranged to facilitate independent testing. A connecting rod mechanism 1 is arranged on the rack 10, and the connecting rod mechanism 1 and the test stations are in one-to-one correspondence. One side of the connecting rod mechanism 1 is sequentially provided with a steel cable guide frame 3, a displacement sensor 4, a test piece anti-rotation mechanism 5 and a test piece mounting mechanism 6, and the displacement sensor 4, the test piece anti-rotation mechanism 5 and the test piece mounting mechanism 6 are in one-to-one correspondence with the connecting rod mechanism 1. The other side of the connecting rod mechanism 1 is sequentially provided with a steel cable guide frame 3, a weight loading mechanism 8 and a weight lifting mechanism 9, and the weight loading mechanism 8 and the weight lifting mechanism 9 are in one-to-one correspondence with the connecting rod mechanism 1. The connecting rod mechanism 1 and the test piece anti-rotation mechanism 5 are connected through a steel cable 2, the test piece is arranged between the test piece anti-rotation mechanism 5 and the test piece mounting mechanism 6, and the connecting rod mechanism 1 and the weight loading mechanism 8 are connected through the steel cable 2. The testing machine related to the application is driven through a mechanical structure, the whole device has small volume, is compact and occupies small space.

[0047] Please refer to Figure 2The connecting rod mechanism 1 comprises a fixed frame 11, a main driving arm 12, a secondary driving arm 13, two vertical arms 14 and two cross arms 15, the fixed frame 11 is fixedly connected with the top mounting frame 7 on the rack 10, the main driving arm 12 and the secondary driving arm 13 are arranged in parallel and are hingedly connected with the fixed frame 11 respectively, the two vertical arms 14 are arranged in parallel with the fixed frame 11 respectively, and one end of the vertical arm 14 is hingedly connected with the main driving arm 12, and the other end of the vertical arm 14 is hingedly connected with the secondary driving arm 13. The main driving arm 12, the secondary driving arm 13 and the two vertical arms 14 form a parallelogram structure, and the parallel and the parallelogram structure mentioned herein are all taken as the reference of the connecting line of the respective hinge points on the arms. The load is loaded on the cross arm 15 through the steel cable 2, and the load on the cross arm 15 acts on the vertical arm 14, the vertical arm 14 can always keep parallel with the fixed frame 11, the force of the vertical arm 14 on the main driving arm 12 and the secondary driving arm 13 is always kept on the central axis of the vertical arm 14, thereby keeping the force arm of the load on both sides of the fixed frame 11 unchanged, not affected by the change of the position and direction of the load force, so as to ensure the stability of the load during the loading process. The cross arm 15 is arranged on both sides of the vertical arm 14, and the vertical arm 14 and the cross arm 15 are fixedly connected one by one, and the cross arm 15 is arranged to facilitate the application of the load on the vertical arm 14. The cross arm 15 is fixedly connected with a fixed block 16, the fixed block 16 is provided with a steel cable 2 pre-hole for fixing the steel cable 2, one of the cross arms 15 is loaded with a weight through the steel cable 2, and the other cross arm 15 is used for hanging the test piece. The main driving arm 12 is arranged along the width direction of the rack 10, and the length of the vertical arm 14 close to the displacement sensor 4 to the fixed frame 11 is less than the length of the vertical arm 14 away from the displacement sensor 4 to the fixed frame 11, which is arranged to make the force arm of the weight side greater than that of the workpiece side. The zero-adjusting weight 17 is detachably connected to the cross arm 15, and the zero-adjusting weight 17 is connected by a screw.

[0048] Please refer to Figure 3 The steel cable guide frame 3 is fixedly connected with the rack 10, the steel cable guide frame 3 is provided with a limiting support 31 and a guide wheel 32, each guide wheel 32 corresponds to two limiting supports 31 respectively, the two limiting supports 31 are oppositely arranged and fixedly connected with the steel cable guide frame 3, and the guide wheel 32 is rotatably installed between the two limiting supports 31 to limit the position of the steel cable 2. In this embodiment, the steel cable guide frame 3 is arranged as a whole, the number of the guide wheels 32 on one steel cable guide frame 3 is multiple, and specifically consistent with the number of the test stations.

[0049] Please refer to Figure 4The anti-rotation mechanism 5 of the test piece comprises a mounting bracket 51, a sliding shaft 52 and a connecting plate 53. The mounting bracket 51 is fixedly connected with the rack 10. The sliding shaft 52 is slidingly connected with the mounting bracket 51. The connecting plate 53 is fixedly connected with the sliding shaft 52. The number of the sliding shaft 52 is at least two to limit the rotation of the connecting plate 53. The upper part of the connecting plate 53 is used to be connected with the steel cable 2. The mounting bracket 51 is provided with a through hole for the steel cable 2 to pass through. The bottom of the connecting plate 53 is fixedly connected with a test piece mounting seat 63. The structure of the test piece mounting seat 63 is a sleeve. An installation bolt is threadedly connected with the sleeve. The end of the test piece is inserted into the sleeve. The test piece is fixed by rotating the installation bolt.

[0050] Please refer to Figure 4 The displacement sensor 4 is arranged between the connecting rod mechanism 1 and the test piece mounting mechanism 6 and is used to measure the change in length of the test piece. The displacement sensor 4 comprises a sensor base 41 and a sensor sliding block 42. The sensor base 41 is fixedly connected with the mounting bracket 51. The sensor sliding block 42 is slidingly connected with the sensor base 41. The sliding direction of the sensor sliding block 42 is parallel to the sliding direction of the sliding shaft 52. A pull rod 43 is connected with the sensor sliding block 42. The pull rod 43 penetrates through the mounting bracket 51. The other end of the pull rod 43 is mounted on the connecting plate 53 to make the connecting plate 53 and the sensor sliding block 42 slide synchronously. The pull rod 43 is provided as a ball head pull rod 43. The two ends of the ball head pull rod 43 are fixed with the sensor sliding block 42 or the connecting plate 53 by bolts. The sliding shaft 52 moves up and down to drive the sliding block of the displacement sensor 4 to move, thereby detecting the displacement.

[0051] Please refer to Figure 5 and Figure 6 The test piece mounting mechanism 6 is used to mount the test piece and is hung on one of the cross arms 15 through the steel cable 2. The test piece mounting mechanism 6 comprises a mounting base 61, a tension sensor 62 and two test piece mounting seats 63. The mounting base 61 is fixedly connected with the rack 10. The two test piece mounting seats 63 are arranged at intervals. Connection holes are arranged in each test piece mounting seat 63. A quick mounting bolt 64 is threadedly connected with the test piece mounting seat 63. One end of the tension sensor 62 is fixedly connected with the mounting base 61. The other end of the tension sensor 62 is fixedly connected with a connecting pin. The connecting pin penetrates through the mounting base 61 and is connected with one of the test piece mounting seats 63 to transmit the tension to the tension sensor 62.

[0052] Please refer to Figure 7The weight loading mechanism 8 comprises a weight fixing rod 81, a weight pin 85 and a weight box 53, the upper end of the weight fixing rod 81 is provided with a wire rope 2 connecting hole, the weight box 53 is arranged on the weight fixing rod 81 and is used for placing small specification weights, the weight fixing rod 81 is formed with a weight fixing hole, and the weight pin 85 penetrates through the large specification weights and is in threaded connection with the weight fixing hole to fix the large specification weights. The small specification weights are specifically a sheet-shaped weight group, and the large specification weights are specifically a slotted weight disc, and the large specification weights can be stacked on each other, and the weight pin 85 is used for fixing the lower weight, and meanwhile, the weight box 53 can be arranged above the large specification weight group to improve the stability of installation and facilitate placement of the small specification weight group.

[0053] Please refer to Figure 8 The weight lifting mechanism 9 is arranged below the weight loading mechanism 8, the weight lifting mechanism 9 comprises a lifting platform 91, a cross arm 93 and a driving member 92, the lifting platform 91 is formed with a weight placing area, the cross arm 93 is arranged between the lifting platform 91 and the rack 10 and provides support for the lifting platform 91, the cross arm 93 is similar in structure to a scissor structure, the ends of the two arms on one side are hingedly connected with the rack 10 and the lifting platform 91 respectively, the ends of the two arms on the other side are provided with rollers and are in sliding fit with the lifting platform 91 or the rack 10 respectively. The driving member 92 is arranged as a linear driving member 92 to drive the lifting platform to lift, so that the lifting platform 91 can be lifted in parallel, and tilting of the platform is avoided, and overturning of the weights is avoided.

[0054] Embodiment 2

[0055] A control method of a multi-station creep tensile testing machine, comprising the following steps:

[0056] S1, a combination of large specification weights and small specification weights is selected and arranged on the weight lifting mechanism 9 and lifted to the weight loading mechanism 8;

[0057] S2, the lifted large specification weights and small specification weights are fixed on the weight loading mechanism 8, and a workpiece is clamped on the weight loading mechanism 8;

[0058] S3, the weight lifting mechanism is lowered to tighten the wire rope 2, the displacement sensor 4 collects the displacement length according to a preset sampling frequency, the tension sensor 62 measures the force value in real time, and the measured displacement length and force value are uploaded to the system for analysis.

[0059] Working principle:

[0060] The initial state is that the lifting mechanism is in the rising position. The test personnel selects the combination of large and small size weights according to the total weight of the load, and hangs them on the weight loading mechanism 8. After the loading is completed, the test specimen hanging end is turned to, and the test specimen is hung on the test specimen hanging mechanism 6. After the hanging is completed, the equipment is started, the weight lifting mechanism 9 slowly falls to the descending position, the weight stretches the steel cable 2 under the action of gravity, and the steel cable 2 is transmitted to the connecting rod system. According to the principle of the lever, the connecting rod system conducts the weight of the weight along the steel cable 2 to the test specimen, so that the test specimen is subjected to tension. Due to the characteristics of the connecting rod mechanism 1 and the action of the steel cable guide frame 3 and the test specimen anti-rotation mechanism 5, the force value is constant. The tension sensor 62 below the test specimen hanging mechanism 6 detects the force value in real time for the system to record. At the same time, due to the action of the tension, the test specimen will slowly lengthen under the action of the tension for a long time. During this period, the displacement sensor 4 will record the displacement change at the set sampling frequency without interruption, and upload the data to the data system. After the test is completed, the system generates a test report including time, displacement, force value and other elements for analysis and research.

[0061] The above is only the preferred embodiment of the present application, and the protection scope of the present application is not limited to the above-mentioned embodiments. Any technical solution falling within the concept of the present application shall fall within the protection scope of the present application. It should be noted that, for ordinary skilled persons in the art, some improvements and decorations without departing from the principles of the present application shall also be considered as the protection scope of the present application.

Claims

1. A multi-station creep tensile testing machine, characterized in that: Includes a frame (10), on which are provided The linkage mechanism (1) includes a fixed frame (11), a main drive arm (12), a secondary drive arm (13), two vertical arms (14), and two horizontal arms (15). The fixed frame (11) is fixedly connected to the frame (10). The main drive arm (12) and the secondary drive arm (13) are arranged in parallel and are respectively hinged to the fixed frame (11). The two vertical arms (14) are arranged in parallel with the fixed frame (11), and one end of the vertical arm (14) is hinged to the main drive arm (12), and the other end of the vertical arm (14) is hinged to the secondary drive arm (13). The horizontal arms (15) are arranged on both sides of the vertical arms (14), and the vertical arms (14) and the horizontal arms (15) correspond one-to-one and are fixedly connected. One of the horizontal arms (15) loads a weight through a steel cable (2), and the other horizontal arm (15) is used to hang the test piece. The specimen mounting mechanism (6) is used to install the specimen and hang it on one of the cross arms (15) via a steel cable (2). Displacement sensor (4), which is disposed between linkage mechanism (1) and specimen mounting mechanism (6) and is used to measure the change in length of specimen; A specimen anti-rotation mechanism (5) is provided between the displacement sensor (4) and the specimen mounting mechanism (6). The specimen anti-rotation mechanism (5) includes a mounting bracket (51), a sliding shaft (52), and a connecting plate (53). The mounting bracket (51) is fixedly connected to the frame (10). The sliding shaft (52) is slidably connected to the mounting bracket (51). The connecting plate (53) is fixedly connected to the sliding shaft (52). The number of sliding shafts (52) is at least two to limit the rotation of the connecting plate (53).

2. The multi-station creep tensile testing machine according to claim 1, characterized in that: The specimen mounting mechanism (6) includes a mounting base (61), a tension sensor (62), and two specimen mounting seats (63). The mounting base (61) is fixedly connected to the frame (10). The two specimen mounting seats (63) are spaced apart. Each specimen mounting seat (63) has a connecting hole. A quick-connect pin (64) is threaded onto the specimen mounting seat (63). One end of the tension sensor (62) is fixedly connected to the mounting base (61), and the other end of the tension sensor (62) is fixedly connected to a connecting pin. The connecting pin passes through the mounting base (61) and connects to one of the specimen mounting seats (63) to transmit tension to the tension sensor (62). The other specimen mounting seat (63) is mounted on the connecting plate (53).

3. The multi-station creep tensile testing machine according to claim 1, characterized in that: The displacement sensor (4) includes a sensor base (41) and a sensor slider (42). The sensor base (41) is fixedly connected to the mounting bracket (51). The sensor slider (42) is slidably connected to the sensor base (41), and the sliding direction of the sensor slider (42) is parallel to the sliding direction of the sliding shaft (52). A pull rod (43) is connected to the sensor slider (42). The other end of the pull rod (43) is installed on the connecting plate (53) so that the connecting plate (53) and the sensor slider (42) slide synchronously.

4. The multi-station creep tensile testing machine according to claim 1, characterized in that: The linkage mechanism (1) is provided with a weight loading mechanism (8) on the side away from the specimen mounting mechanism (6). The weight loading mechanism (8) includes a weight fixing rod (81), a weight pin (85), and a weight box (53). The upper end of the weight fixing rod (81) is reserved with a steel cable (2) connection hole. The weight box (53) is set on the weight fixing rod (81) and is used to place small-sized weights. A weight fixing hole is formed on the weight fixing rod (81). The weight pin (85) passes through a large-sized weight and is threadedly connected to the weight fixing hole to fix the large-sized weight.

5. A multi-station creep tensile testing machine according to claim 4, characterized in that: Below the weight loading mechanism (8) is a weight lifting mechanism (9). The weight lifting mechanism (9) includes a lifting platform (91), a cross arm (93), and a drive member (92). A weight placement area is formed on the lifting platform (91). The cross arm (93) is located between the lifting platform (91) and the frame (10) and provides support for the lifting platform (91). The drive member (92) is a linear drive member (92) to drive the lifting platform to rise and fall.

6. The multi-station creep tensile testing machine according to claim 1, characterized in that: The frame (10) is provided with several test stations, each test station is arranged along the length direction of the frame (10), the linkage mechanism (1), the displacement sensor (4) and the specimen mounting mechanism (6) correspond one-to-one with the test station, the main drive arm (12) is arranged along the width direction of the frame (10), and the length of the vertical arm (14) on the side closer to the displacement sensor (4) to the fixed frame (11) is less than the length of the vertical arm (14) on the side farther away from the displacement sensor (4) to the fixed frame (11).

7. A multi-station creep tensile testing machine according to claim 1, characterized in that: Two cable guide frames (3) are provided below the linkage mechanism (1). The cable guide frames (3) are fixedly connected to the frame (10) and correspond one-to-one with the cross arm (15). The cable guide frames (3) are provided with limit brackets (31) and guide wheels (32). Each guide wheel (32) corresponds to two limit brackets (31). The two limit brackets (31) are arranged opposite to each other and fixedly connected to the cable guide frames (3). The guide wheels (32) are rotatably installed between the two limit brackets (31) to limit the position of the cable (2).

8. A multi-station creep tensile testing machine according to claim 1, characterized in that: A zeroing weight (17) is detachably connected to the cross arm (15).

9. A control method for a multi-station creep tensile testing machine, characterized in that: A multi-station creep tensile testing machine is provided, including a frame (10), on which are arranged... The linkage mechanism (1) includes a fixed frame (11), a main drive arm (12), a secondary drive arm (13), two vertical arms (14), and two horizontal arms (15). The fixed frame (11) is fixedly connected to the frame (10). The main drive arm (12) and the secondary drive arm (13) are arranged in parallel and are respectively hinged to the fixed frame (11). The two vertical arms (14) are arranged in parallel with the fixed frame (11), and one end of the vertical arm (14) is hinged to the main drive arm (12), and the other end of the vertical arm (14) is hinged to the secondary drive arm (13). The horizontal arms (15) are arranged on both sides of the vertical arms (14), and the vertical arms (14) and the horizontal arms (15) correspond one-to-one and are fixedly connected. The other horizontal arm (15) is used to hang the test specimen. The specimen mounting mechanism (6) is used to install the specimen and hang it on one of the cross arms (15) via a steel cable (2). A tension sensor (62) is provided on the specimen mounting mechanism (6). A displacement sensor (4) is disposed between the linkage mechanism (1) and the specimen mounting mechanism (6) and is used to measure the change in length of the specimen. A weight loading mechanism (8) is provided on the side of the linkage mechanism (1) away from the specimen mounting mechanism (6). The weight mounting mechanism and the cross arm (15) are connected by a steel cable (2). A weight lifting mechanism (9) is provided below the weight loading mechanism (8); The control method includes the following steps: S1. Select a combination of large-size and small-size weights and place them on the weight lifting mechanism (9) and lift them to the weight loading mechanism (8); S2. Fix the large and small weights after lifting onto the weight loading mechanism (8), and clamp the workpiece onto the weight loading mechanism (8); S3. The weight lifting mechanism descends to the point where the steel cable (2) is tightened, the displacement sensor (4) collects the displacement length according to the preset sampling frequency, and the tension sensor (62) measures the force value in real time.

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