A longitudinal tensile testing device for test tube production

Abstract

The present invention relates to the field of test tube testing technology, and in particular to a longitudinal tensile testing device for test tube production. It comprises a test bench, a pull-down component is provided at the bottom of the test bench, the output end of the pull-down component extends to the top of the test bench, and is connected to two groups of lower stretching units by transmission, and an upper stretching unit is provided at the center of the top of the test bench; the upper stretching unit comprises a test tube sleeve column, the top of the test tube sleeve column extends to the top of the pull-down component, and a lifting slot is provided at the top port, a second micro electric push rod is provided in the lifting slot, the top of the second micro electric push rod is connected to a lifting column by transmission, and the top of the lifting column extends to the top of the lifting slot. Each group of abutment plates of the present invention applies force to the test tube from the outside, while the upper abutment ball applies force to the test tube from the inside of the test tube, which makes the force inside and outside the test tube more uniform, avoids additional damage to the test tube caused by all external clamping, and cooperates with bidirectional stretching, thereby improving the accuracy of the test.

Description

Technical Field

[0001] The invention belongs to the technical field of test tube testing, and in particular relates to a longitudinal tensile testing device for test tube production. Background Art

[0002] Test tubes are made of composite materials such as glass, polypropylene, polyethylene, etc. after a series of processing. Usually, after the test tubes are produced, the strength of the test tubes needs to be tested, especially the longitudinal tensile test, which is particularly important because it directly affects the load-bearing capacity and durability of the test tubes.

[0003] After searching, the cited publication number is CN118294273A, the publication date is July 5, 2024, and the name is a composite material pipe circumferential tensile performance testing device and method. It includes a pressure block, a pressure rod, a hydraulic cylinder base, a support rod, and an arc-shaped support gasket. The pressure block is located at the top of the pressure rod, and the bottom of the pressure rod is sealed and connected to the hydraulic hole at the top of the hydraulic cylinder base. The hydraulic cylinder base is suitable for filling hydraulic oil and expanding the support rod outward under the pressure of the pressure testing machine. One end of the support rod is sealed and connected to the hydraulic hole at the bottom of the hydraulic cylinder base, and the other end is fixedly connected to the arc-shaped support gasket. The above embodiment uses the original annular specimen of the pipe for stretching, and its annular stress state and deformation are closer to the bulging process of the pipe than the traditional separation disc device.

[0004] However, the above embodiment still has the following defects:

[0005] The above embodiment is stretched only in a single direction and is only fixed from the outside, which may easily cause additional damage to the pipe ring due to uneven force inside and outside and at both ends during the tensile test, thereby reducing the accuracy of the test. Summary of the invention

[0006] In view of the above problems, the present invention provides a longitudinal tensile testing device for test tube production, comprising a test bench, a pull-down component is provided at the bottom of the test bench, the output end of the pull-down component extends to the top of the test bench and is transmission-connected with two groups of lower tensile units, and an upper tensile unit is provided at the center of the top of the test bench;

[0007] The upper stretching unit comprises a test tube sleeve column, the top of the test tube sleeve column extends above the pull-down component, and a lifting slot is provided at the top port, a second micro electric push rod is provided in the lifting slot, the top of the second micro electric push rod is transmission-connected with a lifting column, the top of the lifting column extends above the lifting slot, and an upper ball with a hemispherical structure is installed;

[0008] The test bench is provided with a tensile test unit, and the upper and lower ends of the tensile test unit extend to the test tube sleeve column and the lower tensile unit respectively;

[0009] The upper ball applies force to the test tube from the inside, and the lower tensile unit applies force from the outside at the same time, stretching the test tube up and down. The tensile strength of the test tube is tested by the tensile test unit, and the force is more evenly distributed.

[0010] Furthermore, the pull-down component includes a lower fixing ring, which is located above the test bench, and the central axis of the lower fixing ring coincides with the test bench; a first servo electric cylinder is installed in the vertical direction at the center of the bottom of the test bench, and a lifting platform is installed at the bottom of the first servo electric cylinder, and a plurality of lifting rods are distributed in a circular array around the edges of the lifting platform, and the top of the lifting rod extends to above the test bench and is installed at the bottom of the lower fixing ring.

[0011] Furthermore, the lower stretching unit includes a general mounting plate, which is mounted on one edge of the central hole of the lower fixing ring, and a second servo electric cylinder is mounted on a side wall of the general mounting plate away from the central hole of the lower fixing ring.

[0012] Furthermore, the output end of the second servo electric cylinder extends in the horizontal direction to above the central hole of the lower fixing ring and is installed with a crescent plate, which is configured as a plate-like structure with a fan-shaped cross-section in a top view, and one end of a plurality of groups of lower interference mechanisms are arranged at equal intervals in the horizontal direction on a side wall of the crescent plate away from the second servo electric cylinder, and the other end of the lower interference mechanism extends horizontally toward the central axis direction of the central hole of the lower fixing ring.

[0013] Furthermore, the lower resistance mechanism includes a first micro electric push rod, an output end of which extends horizontally toward the central axis direction of the central hole of the lower fixing ring and is provided with a resistance plate.

[0014] Furthermore, two groups of anti-slip strips are installed on a side wall of the abutment plate away from the first micro-electric push rod. The two groups of anti-slip strips are arranged crosswise with the junction located at the center of the abutment plate. Several groups of anti-slip teeth are arranged at equal intervals on the anti-slip strip along its own length direction.

[0015] Furthermore, a plurality of side slide grooves are provided in a circular array on the side walls around the lifting groove, and a sliding block is slidably connected in the side slide groove; an inner push mechanism is provided above the sliding block.

[0016] Furthermore, two groups of female blocks are symmetrically arranged on both sides of the side sliding groove, and a side wall of the female block close to the central axis of the lifting groove is set as an inclined surface, and the width of the bottom of the female block is greater than the width of the top; the main body of the inner push mechanism slides and fits on the inclined surface.

[0017] Furthermore, the inner push mechanism includes two groups of spring columns, one end of the two groups of spring columns is installed on the lifting column, the other ends of the two groups of spring columns extend horizontally toward the two groups of mother blocks respectively, and sub-blocks are installed at the ports, and the sub-blocks slide and fit on the inclined surface; a sleeve mounting plate is installed between the two groups of sub-blocks.

[0018] Furthermore, a threaded sleeve is installed on a side wall of the sleeve mounting plate away from the lifting column, and a screw rod is threadedly connected in the threaded sleeve along the horizontal direction. One end of an extension rod is installed on the end of the screw rod away from the threaded sleeve, and the other end of the extension rod extends horizontally to the outside of the test tube sleeve, and an inner push block is installed at the port, and the inner push block is a spherical structure.

[0019] The beneficial effects of the present invention are:

[0020] 1. Put the opening of the test tube downward onto the upper ball. Since the upper ball is a hemispherical structure, it fits perfectly with the inner wall of the bottom of the test tube. During the test, when the test tube is stretched downward by the lower stretching unit, the second micro-electric push rod is started, and the second micro-electric push rod pushes the upper ball upward to stretch the test tube upward, thereby achieving bidirectional stretching of the test tube. In addition, each group of plates applies force to the test tube from the outside, while the upper ball applies force to the test tube from the inside of the test tube, which makes the force inside and outside the test tube more uniform, avoiding additional damage to the test tube caused by clamping all from the outside, and combined with bidirectional stretching, the accuracy of the test is improved.

[0021] 2. When the lifting column rises, the inner push mechanism is driven to rise as a whole, and the sub-block and the mother block are slidably fitted. Since the bottom width of the mother block is greater than the top, when the inner push mechanism rises, the spring column will squeeze the extension rod outward, so that the inner push block is in contact with the inner wall of the test tube, and each set of screw rods and threaded sleeves can be movably disassembled, so that any number of inner push mechanisms can be selected for use as needed, thereby simulating the test tube's ability to withstand longitudinal stretching when its side is squeezed by external force in a real use environment, thereby enriching the functionality of the device.

[0022] 3. Since the crescent plate is a fan-shaped ring structure, and the output ends of each group of first micro-electric push rods are facing the central axis of the test tube, when the test tube is fixed, it will receive centripetal pressure from different directions on all sides, making the force on the surface of the test tube more balanced. At the same time, the two groups of cross-arranged anti-slip strips and each group of anti-slip teeth increase the friction between the plate and the test tube, thereby avoiding slipping, and also improving the fixing effect when the test tube is pulled down. And through each group of independent first micro-electric push rods, the horizontal position of the plate can be adjusted, so that the device can also test special-shaped test tubes with uneven outer walls, thereby improving the compatibility of the device.

[0023] 4. During the test, the bidirectional tensile force of the upper and lower tensile units will be transmitted to the tension sensor at the same time. When the test tube is damaged, stop stretching, and then read the value on the tension sensor, so as to quickly obtain the maximum longitudinal tensile force that the test tube can withstand, without additional calculation and reading, thereby improving the test efficiency.

[0024] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A schematic structural diagram of a tensile testing device according to an embodiment of the present invention is shown.

[0027] Figure 2 A schematic top view of a tensile testing device according to an embodiment of the present invention is shown.

[0028] Figure 3 A schematic structural diagram of a lower stretching unit according to an embodiment of the present invention is shown.

[0029] Figure 4 A schematic structural diagram of a lower interference mechanism according to an embodiment of the present invention is shown.

[0030] Figure 5 A schematic diagram showing the connection of two groups of anti-slip strips according to an embodiment of the present invention is shown.

[0031] Figure 6 A schematic structural diagram of an upper stretching unit according to an embodiment of the present invention is shown.

[0032] Figure 7 A schematic cross-sectional view of an upper stretching unit according to an embodiment of the present invention is shown.

[0033] Figure 8 A schematic diagram of the connection between the female stop block and the lifting slot according to an embodiment of the present invention is shown.

[0034] Fig. 9 A schematic structural diagram of an inner push mechanism according to an embodiment of the present invention is shown.

[0035] Fig.10 A structural schematic diagram of a tensile testing unit according to an embodiment of the present invention is shown.

[0036] In the figure: 100, test bench; 110, first servo electric cylinder; 120, lifting platform; 130, lifting rod; 200, lower fixing ring; 300, lower stretching unit; 310, total mounting plate; 320, second servo electric cylinder; 330, crescent plate; 340, lower abutment mechanism; 341, first micro electric push rod; 342, abutment plate; 343, anti-slip strip; 344, anti-slip teeth; 400, upper stretching unit; 410, test tube sleeve column; 411, lifting slot; 412, side slide slot; 420, first Two micro electric push rods; 421, lifting column; 422, slider; 430, mother block; 431, inclined plane; 440, inner push mechanism; 441, spring column; 442, sub-block; 443, sleeve mounting plate; 444, threaded sleeve; 445, screw rod; 446, extension rod; 447, inner push block; 450, upper ball; 500, tension test unit; 510, edge mounting block; 520, tension sensor; 530, cross bar; 540, electric clamp; 550, fixing ring mounting plate. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] The embodiment of the present invention provides a longitudinal tensile test device for test tube production, including a test bench 100. For example, Figure 1 and Figure 2 As shown, a lower fixing ring 200 is arranged above the test bench 100 , and the central axis of the lower fixing ring 200 coincides with the central axis of the test bench 100 .

[0039] A first servo electric cylinder 110 is vertically installed at the bottom center of the test bench 100, a lifting platform 120 is installed at the bottom of the first servo electric cylinder 110, and a plurality of lifting rods 130 are distributed in a circular array around the edges of the lifting platform 120. The top of the lifting rod 130 extends to above the test bench 100 and is installed at the bottom of the lower fixing ring 200.

[0040] The first servo electric cylinder 110 , the lifting platform 120 , the lower fixing ring 200 and a plurality of lifting rods 130 are combined to form a pull-down component.

[0041] Two groups of lower stretching units 300 are symmetrically arranged at the edges of both sides of the central hole of the lower fixing ring 200. The lower stretching units 300 are driven by the lower pull component to move vertically downward, so as to stretch the test tube vertically downward.

[0042] An upper stretching unit 400 is installed at the center of the top of the test bench 100, and the top height of the upper stretching unit 400 is higher than the top height of the lower stretching unit 300. The upper stretching unit 400 is used to stretch the test tube vertically upward.

[0043] A tension test unit 500 is installed at the top edge of one side of the test bench 100, and the upper and lower ends of the tension test unit 500 are respectively connected to the upper stretching unit 400 and the lower stretching unit 300. The tension test unit 500 is used to test the tension borne by the test tube.

[0044] For example, Figure 3 As shown, the lower stretching unit 300 includes a general mounting plate 310, and the general mounting plate 310 is installed at the edge of one side of the central hole of the lower fixing ring 200. A second servo electric cylinder 320 is installed on a side wall of the general mounting plate 310 away from the central hole of the lower fixing ring 200. The output end of the second servo electric cylinder 320 extends horizontally to above the central hole of the lower fixing ring 200, and is installed with a crescent plate 330. The crescent plate 330 is configured as a plate-like structure with a fan-shaped cross-section in a top view. On a side wall of the crescent plate 330 away from the second servo electric cylinder 320, one end of a plurality of groups of lower resistance mechanisms 340 are arranged at equal intervals in the horizontal direction, and the other end of the lower resistance mechanism 340 extends horizontally toward the central axis direction of the central hole of the lower fixing ring 200.

[0045] For example, Figure 4 and Figure 5 As shown, the lower abutment mechanism 340 includes a first micro electric push rod 341, the output end of which extends horizontally toward the central axis of the central hole of the lower fixing ring 200, and is provided with a stop plate 342, and two groups of anti-slip strips 343 are provided on a side wall of the stop plate 342 away from the first micro electric push rod 341, the two groups of anti-slip strips 343 are arranged crosswise with the junction located at the center of the stop plate 342. The anti-slip strip 343 has a plurality of groups of anti-slip teeth 344 arranged at equal intervals along its own length direction.

[0046] The opening of the test tube is vertically sleeved on the upper stretching unit 400 downward, and then the two groups of second servo electric cylinders 320 are controlled to drive the two groups of crescent plates 330 to move toward the test tube at the same time until each group of abutment plates 342 abuts against the outer wall of the test tube. When performing a tensile test, the pull-down component and the upper stretching unit 400 are started at the same time, and the test tube is longitudinally stretched from both the upper and lower directions by the upper stretching unit 400 and the pull-down component at the same time, and the tension generated by the upper stretching unit 400 and the pull-down component when moving is tested by the tension test unit 500. When the test tube is damaged, the stretching work is stopped, and the tension parameters displayed on the tension test unit 500 are read to obtain the maximum longitudinal tensile force that the test tube can withstand.

[0047] Since the crescent plate 330 is a fan-shaped ring structure, and the output ends of each group of first micro-electric push rods 341 are all facing the central axis of the test tube, when the test tube is fixed, it will receive centripetal pressure from different directions on all sides, making the force on the surface of the test tube more balanced. At the same time, the two groups of cross-arranged anti-slip strips 343 and each group of anti-slip teeth 344 increase the friction between the plate 342 and the test tube, thereby avoiding slipping, and also improving the fixing effect when the test tube is pulled down. And through each group of independent first micro-electric push rods 341, the horizontal position of the plate 342 can be adjusted, so that the device can also test special-shaped test tubes with uneven outer walls, thereby improving the compatibility of the device.

[0048] For example, Figure 6 and Figure 7 As shown, the upper stretching unit 400 includes a test tube sleeve column 410, the bottom of which is installed at the top center of the test bench 100, the top of which extends vertically to above the central hole of the lower fixing ring 200, and a lifting groove 411 is provided at the top port, and a plurality of side slide grooves 412 are provided in a circular array on the side walls around the lifting groove 411, the side slide grooves 412 are vertically arranged, and a slider 422 is slidably connected to the side slide grooves 412.

[0049] Exemplarily, a second micro electric push rod 420 is installed at the center of the inner wall at the bottom of the lifting slot 411, and a lifting column 421 is connected to the top of the second micro electric push rod 420 in a transmission manner, and the end of the slider 422 away from the side slide slot 412 is installed on the lifting column 421. A plurality of groups of inner push mechanisms 440 are distributed in a circular array on the side wall of the lifting column 421, and the number of the inner push mechanisms 440 is the same as the side slide slot 412, and the output end of each group of the inner push mechanisms 440 extends horizontally to the outside of the test tube sleeve column 410 through a corresponding group of side slide slots 412. The top of the lifting column 421 extends to the top of the lifting slot 411, and is installed with an upper ball 450, which is a hemispherical structure.

[0050] Preferably, the models of the first micro electric linear actuator 341 and the second micro electric linear actuator 420 are both LUILEC-B32TL.

[0051] For example, Figure 8 As shown, two groups of female blocks 430 are symmetrically arranged on both sides of the side slide groove 412, and a side wall of the female block 430 close to the central axis of the lifting groove 411 is set as an inclined surface 431, and the width of the bottom of the female block 430 is greater than the width of the top. The main body of the inner push mechanism 440 slides and fits on the inclined surface 431.

[0052] For example, Fig. 9 As shown, the inner push mechanism 440 includes two groups of spring columns 441, one end of the two groups of spring columns 441 is installed on the lifting column 421, and the other end of the two groups of spring columns 441 extends horizontally toward the two groups of mother blocks 430, and a sub-block 442 is installed at the port, and the sub-block 442 slides and fits on the inclined surface 431. A sleeve mounting plate 443 is installed between the two groups of sub-blocks 442, and a threaded sleeve 444 is installed on a side wall of the sleeve mounting plate 443 away from the lifting column 421, and a screw rod 445 is threadedly connected in the horizontal direction in the threaded sleeve 444, and one end of the extension rod 446 is installed at one end of the screw rod 445 away from the threaded sleeve 444, and the other end of the extension rod 446 extends horizontally to the outside of the test tube sleeve column 410, and an inner push block 447 is installed at the port, and the inner push block 447 is a spherical structure.

[0053] The opening of the test tube is sleeved downward on the upper ball 450. Since the upper ball 450 is a hemispherical structure, it fits perfectly with the inner wall of the bottom of the test tube. During the test, when the test tube is stretched downward by the lower stretching unit 300, the second micro-electric push rod 420 is started, and the upper ball 450 is pushed upward by the second micro-electric push rod 420 to stretch the test tube upward, thereby achieving bidirectional stretching of the test tube. In addition, each group of support plates 342 applies force to the test tube from the outside, while the upper ball 450 applies force to the test tube from the inside of the test tube, which makes the force inside and outside the test tube more uniform, avoiding additional damage to the test tube caused by clamping entirely from the outside, and combined with bidirectional stretching, the accuracy of the test is improved.

[0054] When the lifting column 421 rises, the inner push mechanism 440 is driven to rise as a whole, and the sub-block 442 and the mother block 430 are slidably fitted. Since the bottom width of the mother block 430 is larger than the top, the spring column 441 will squeeze the extension rod 446 outward when the inner push mechanism 440 rises, so that the inner push block 447 is in contact with the inner wall of the test tube, and each group of screw rods 445 and threaded sleeves 444 can be movably disassembled, so that any number of groups of inner push mechanisms 440 can be selected for use as needed, thereby simulating the test tube's ability to withstand longitudinal stretching when its side is squeezed by external force in a real use environment, thereby enriching the functionality of the device.

[0055] For example, Fig.10 As shown, the tension test unit 500 includes an edge mounting block 510, which is mounted at the top edge of the test bench 100. A tension sensor 520 is mounted on the edge mounting block 510, and the model of the tension sensor 520 is LH-S09A5-M6. The tension sensor 520 is respectively connected to a group of cross bars 530 at the upper and lower ends. The upper group of cross bars 530 extends horizontally to the test tube sleeve column 410 and is installed with an electric clamp 540, and the model of the electric clamp 540 is RM-EGB-06L-20D. The lower group of cross bars 530 extends horizontally to the edge of the central hole of the lower fixed ring 200, and is installed with a fixed ring mounting plate 550, and the bottom of the fixed ring mounting plate 550 is installed on the lower fixed ring 200.

[0056] After the test tube is sleeved on the upper ball 450, the electric clamp 540 is controlled to clamp the test tube. During the test, the bidirectional tensile force of the upper tensile unit 400 and the lower tensile unit 300 will be simultaneously transmitted to the tension sensor 520. When the test tube is damaged, the stretching is stopped, and then the value on the tension sensor 520 is read, so that the maximum longitudinal tensile force that the test tube can withstand can be quickly obtained at the first time, without additional calculation and reading, thereby improving the test efficiency.

[0057] The above embodiments have the following beneficial effects:

[0058] 1. Sleeve the opening of the test tube downward onto the upper ball 450. Since the upper ball 450 is a hemispherical structure, it fits perfectly with the inner wall of the bottom of the test tube. During the test, when the test tube is stretched downward by the lower stretching unit 300, the second micro-electric push rod 420 is started, and the upper ball 450 is pushed upward by the second micro-electric push rod 420 to stretch the test tube upward, thereby achieving bidirectional stretching of the test tube. In addition, each group of abutment plates 342 applies force to the test tube from the outside, while the upper ball 450 applies force to the test tube from the inside of the test tube, which makes the force inside and outside the test tube more uniform, avoiding additional damage to the test tube caused by clamping entirely from the outside, and combined with bidirectional stretching, the accuracy of the test is improved.

[0059] 2. When the lifting column 421 rises, the inner push mechanism 440 is driven to rise as a whole, and the sub-block 442 and the mother block 430 are slidably fitted. Since the bottom width of the mother block 430 is larger than the top, when the inner push mechanism 440 rises, the spring column 441 will squeeze the extension rod 446 outward, so that the inner push block 447 is in contact with the inner wall of the test tube, and each group of screw rods 445 and threaded sleeves 444 can be movably disassembled, so that any number of groups of inner push mechanisms 440 can be selected for use as needed, thereby simulating the test tube's ability to withstand longitudinal stretching when its side is squeezed by external force in a real use environment, thereby enriching the functionality of the device.

[0060] 3. Since the crescent plate 330 is a fan-shaped ring structure, and the output ends of each group of first micro-electric push rods 341 are all facing the central axis of the test tube, when the test tube is fixed, it will receive centripetal pressure from different directions on all sides, making the force on the surface of the test tube more balanced. At the same time, the two groups of cross-arranged anti-slip strips 343 and each group of anti-slip teeth 344 increase the friction between the plate 342 and the test tube, thereby avoiding slipping, and also improving the fixing effect when the test tube is pulled down. And through each group of independent first micro-electric push rods 341, the horizontal position of the plate 342 can be adjusted, so that the device can also test special-shaped test tubes with uneven outer walls, thereby improving the compatibility of the device.

[0061] 4. During the test, the bidirectional tensile force of the upper tensile unit 400 and the lower tensile unit 300 will be simultaneously transmitted to the tension sensor 520. When the test tube is damaged, the stretching is stopped, and then the value on the tension sensor 520 is read, so that the maximum longitudinal tensile force that the test tube can withstand can be quickly obtained at the first time, without additional calculation and reading, thereby improving the test efficiency.

[0062] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A longitudinal tensile testing device for test tube production, comprising a test bench (100), characterized in that: A pull-down component is provided at the bottom of the test bench (100); an output end of the pull-down component extends above the test bench (100) and is transmission-connected to two groups of lower stretching units (300); an upper stretching unit (400) is provided at the center of the top of the test bench (100); The upper stretching unit (400) comprises a test tube sleeve column (410), the top of the test tube sleeve column (410) extends to above the pull-down component, and a lifting slot (411) is provided at the top port, a second micro electric push rod (420) is provided in the lifting slot (411), the top of the second micro electric push rod (420) is transmission-connected to a lifting column (421), the top of the lifting column (421) extends to above the lifting slot (411), and an upper abutting ball (450) of a hemispherical structure is installed; The test bench (100) is provided with a tensile testing unit (500), and the upper and lower ends of the tensile testing unit (500) extend to the test tube sleeve column (410) and the lower tensile unit (300) respectively; The pull-down component comprises a lower fixing ring (200), the lower fixing ring (200) is located above the test bench (100), and the central axis of the lower fixing ring (200) coincides with the test bench (100); a first servo electric cylinder (110) is vertically mounted at the center of the bottom of the test bench (100), a lifting platform (120) is mounted at the bottom of the first servo electric cylinder (110), a plurality of groups of lifting rods (130) are distributed in a circular array around the edges of the lifting platform (120), the tops of the lifting rods (130) extend above the test bench (100), and are mounted at the bottom of the lower fixing ring (200); The upper abutment ball (450) exerts force on the test tube from the inside and the lower stretching unit (300) exerts force on the test tube from the outside at the same time, stretching the test tube up and down. The tensile strength of the test tube is tested by the tensile testing unit (500), and the force is more evenly applied.

2. A longitudinal tensile test device for test tube production according to claim 1, characterized in that: The lower stretching unit (300) comprises a general mounting plate (310), the general mounting plate (310) being mounted on an edge of one side of the central hole of the lower fixing ring (200), and a second servo electric cylinder (320) being mounted on a side wall of the general mounting plate (310) away from the central hole of the lower fixing ring (200).

3. A longitudinal tensile test device for test tube production according to claim 2, characterized in that: The output end of the second servo electric cylinder (320) extends in the horizontal direction to above the central hole of the lower fixing ring (200) and is installed with a crescent plate (330). The crescent plate (330) is configured as a plate-shaped structure with a fan-shaped cross-section in a top view. On a side wall of the crescent plate (330) away from the second servo electric cylinder (320), one end of a plurality of groups of lower abutment mechanisms (340) are arranged at equal intervals in the horizontal direction. The other end of the lower abutment mechanism (340) extends horizontally toward the central axis direction of the central hole of the lower fixing ring (200).

4. A longitudinal tensile test device for test tube production according to claim 3, characterized in that: The lower abutment mechanism (340) comprises a first micro electric push rod (341), the output end of which extends horizontally in the direction of the central axis of the central hole of the lower fixing ring (200) and is provided with an abutment plate (342).

5. A longitudinal tensile test device for test tube production according to claim 4, characterized in that: Two groups of anti-slip strips (343) are installed on a side wall of the abutment plate (342) away from the first micro electric push rod (341), the two groups of anti-slip strips (343) are arranged crosswise with the junction located at the center of the abutment plate (342); and a plurality of groups of anti-slip teeth (344) are arranged at equal intervals on the anti-slip strips (343) along their own length direction.

6. A longitudinal tensile test device for test tube production according to claim 1, characterized in that: A plurality of side sliding grooves (412) are provided in a circular array on the side walls surrounding the lifting groove (411), and a sliding block (422) is slidably connected in the side sliding groove (412); an inner pushing mechanism (440) is provided above the sliding block (422).

7. A longitudinal tensile test device for test tube production according to claim 6, characterized in that: Two groups of female abutment blocks (430) are symmetrically arranged on both sides of the side sliding groove (412); a side wall of the female abutment block (430) close to the central axis of the lifting groove (411) is arranged as an inclined surface (431), and the width of the bottom of the female abutment block (430) is greater than the width of the top; the main body of the inner pushing mechanism (440) is slidably fitted on the inclined surface (431).

8. A longitudinal tensile test device for test tube production according to claim 7, characterized in that: The inner push mechanism (440) comprises two groups of spring columns (441), one end of the two groups of spring columns (441) is mounted on the lifting column (421), the other end of the two groups of spring columns (441) extends horizontally toward the two groups of mother blocks (430), and a sub-block (442) is mounted at the port, and the sub-block (442) is slidably fitted on the inclined surface (431); a sleeve mounting plate (443) is mounted between the two groups of sub-blocks (442).

9. A longitudinal tensile test device for test tube production according to claim 8, characterized in that: A threaded sleeve (444) is installed on a side wall of the sleeve mounting plate (443) away from the lifting column (421); a screw rod (445) is threadedly connected in a horizontal direction inside the threaded sleeve (444); one end of an extension rod (446) is installed at one end of the screw rod (445) away from the threaded sleeve (444); the other end of the extension rod (446) extends horizontally to the outside of the test tube sleeve column (410); and an inner push block (447) is installed at the port; the inner push block (447) is a spherical structure.

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