Pendulum impact test device for steel pipe

Abstract

The invention discloses a pendulum bob impact test device for a steel pipe, and relates to the technical field of impact tests, the pendulum bob impact test device comprises a base, a base is fixed on the base, a power mechanism is fixed on the base, the power mechanism is provided with a power output end, and the power output end is provided with a pendulum bob assembly; a test piece seat corresponding to the pendulum bob assembly is also fixed on the base; a visual sensor for observing the test piece on the test piece seat is also arranged in the space above the base; an automatic feeding assembly used for automatic feeding is further arranged in the space above the base. During testing, the automatic feeding assembly is used for providing a first test piece, the pendulum bob assembly impacts the first test piece at a first speed and a first impulse at the moment, then the automatic feeding assembly provides a second test piece, and the pendulum bob assembly adjusts parameters of the pendulum bob assembly based on the damage degree of the first test piece and impacts the second test piece at a second speed and a second impulse. The test result can truly reflect the material performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of impact test, in particular to a pendulum impact test device for steel pipe. BACKGROUND

[0002] As a key material in engineering field, the impact toughness of steel pipe is directly related to the structural safety and service life. At present, the pendulum impact testing machine is widely used in industry to evaluate the performance of steel pipe. This kind of equipment impacts the test piece by the kinetic energy released by the pendulum, and judges the material properties according to the fracture energy or fracture morphology. The traditional testing machine is usually composed of a base, a pendulum mechanism, a test piece seat and a manual operation system, and relies on manual operation to complete test piece positioning and residual material cleaning and other operations, and performs single test with fixed impact parameters.

[0003] However, the test process dominated by manual operation not only has low efficiency, but also has safety hazards. At the same time, manual positioning is easy to cause test piece installation deviation, causing impact point deviation and affecting the reliability of test results. In addition, the traditional equipment only supports single fixed energy impact mode, which is difficult to adapt to the test requirements of different toughness materials. For high toughness steel pipe, single impact may not completely break the test piece; for brittle materials, fixed energy may mask the performance boundary characteristics, resulting in inaccurate judgment of material response characteristics (such as ductile fracture and brittle fracture).

[0004] Therefore, it is necessary to provide a pendulum impact test device for steel pipe to solve the above problems. SUMMARY

[0005] To solve the above problems, the present application provides the following technical scheme: a pendulum impact test device for steel pipe, comprising a base, a base fixed on the base, a power mechanism fixed on the base, the power mechanism having a power output end, and a pendulum assembly installed on the power output end; the base is also fixed with a test piece seat corresponding to the pendulum assembly; a visual sensor for observing the test piece on the test piece seat is arranged in the space above the base; an automatic feeding assembly for automatic feeding is arranged in the space above the base; during the test, the automatic feeding assembly provides a first test piece, at this time the pendulum assembly impacts the first test piece at a first speed and a first impact, then the automatic feeding assembly provides a second test piece, the pendulum assembly adjusts its parameters based on the damage degree of the first test piece, and impacts the second test piece at a second speed and a second impact.

[0006] As preferred, the first speed control is in the range of 2m / s-3m / s, and the first energy is set to 40%-60% of the material's estimated fracture energy; the visual sensor collects the first specimen's failure morphology and crack propagation data, while the displacement data during the impact process is collected by the measuring assembly inside the pendulum assembly; based on the failure morphology, crack propagation data and displacement data, the material's response characteristics are comprehensively judged to be brittle or ductile; the second speed is the standard test speed of 5m / s-5.5m / s.

[0007] As preferred, the visual sensor is a high-speed camera with a frame rate of no less than 1000 frames / s.

[0008] As preferred, the middle part of the base is provided with a push rod, and the output end of the push rod is provided with a push block corresponding to the specimen seat, and the push rod and the push block are used for positioning the specimen or performing the unloading operation on the first specimen.

[0009] As preferred, the pendulum assembly comprises: a pendulum seat connected to the power output end through a pendulum rod; a knife seat connected to the pendulum seat through an elastic element; a knife body detachably connected to the knife seat; a guide rod fixed to the side of the knife seat away from the knife body, and the guide rod slides into the pendulum seat; the pendulum seat is also provided with a measuring assembly corresponding to the guide rod and a locking assembly; when the first specimen is impacted, the locking assembly is in a loosened state, and the measuring assembly measures the displacement data during the impact process; when the second specimen is impacted, the locking assembly locks the guide rod, so that the knife seat and the pendulum seat form a rigid connection.

[0010] As preferred, the measuring assembly comprises: a synchronous wheel rotationally arranged in the pendulum seat and matched with a rack on the guide rod; an arc plate fixed in the pendulum seat and arranged concentrically with the synchronous wheel; a pressure sensor array composed of a plurality of pressure sensors sequentially attached to the side of the arc plate close to the synchronous wheel; a pressing needle fixed to the synchronous wheel and rotating with the synchronous wheel to press the pressure sensor array.

[0011] As preferred, the outer surface of the pressure sensor array is provided with a protective layer, and the part of the pressing needle in contact with the protective layer is spherical.

[0012] As preferred, the locking assembly comprises: a mounting plate fixedly embedded in the pendulum seat; a driving wheel rotationally arranged in the pendulum seat and matched with the rack on the guide rod; at least two symmetrically arranged clamping plates, one end of the clamping plate is hinged to the mounting plate, and the other end is hinged to a connecting rod, and the connecting rod is driven by a micro telescopic rod.

[0013] As preferred, the automatic feeding assembly comprises a transverse driving member with a transverse driving end; a height adjusting assembly fixed to the transverse driving end, and the height adjusting assembly has a height adjusting end; a rotating seat fixed to the height adjusting end, and the rotating seat has a rotating end; and an adsorption plate fixed to the rotating end, and the adsorption plate is provided with adsorption structures for adsorbing test pieces, and the adsorption plate is further fixed with a positioning plate.

[0014] As preferred, when the test piece is judged as a ductile response, the second energy is set to be higher than a standard impact energy value; and when the test piece is judged as a brittle response, the second energy is set to be the standard impact energy value or slightly lower than the standard impact energy value.

[0015] Compared with the prior art, the present application provides a pendulum impact test device for steel pipes, which has the following beneficial effects:

[0016] The automatic feeding assembly in the present application can realize full-automatic operation of test piece taking and placing, and can realize positioning and discharging of the test piece in cooperation with the push rod and the push block, and can eliminate the risk of manual intervention by isolating the impact area with the protective net, thereby significantly improving the test efficiency and operation safety.

[0017] In the present application, the first low-energy impact is used to obtain the damage morphology, crack propagation and displacement data of the test piece, and the brittleness and ductility of the material are comprehensively judged; and the second impact parameters are dynamically adjusted according to the above, so as to ensure that the test results truly reflect the material performance. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 Fig. 1 is a plan view of a pendulum impact test device for steel pipes according to the present application;

[0019] Figure 2 Fig. 3 is a plan view of a test piece seat, a pendulum assembly and a power mechanism according to the present application;

[0020] Figure 3 Fig. 5 is a plan view of an automatic feeding assembly according to the present application;

[0021] Figure 4 Fig. 7 is a sectional view of a pendulum assembly according to the present application;

[0022] Figure 5 Fig. 9 is a sectional view of a measuring assembly and a locking assembly according to the present application;

[0023] In the figure: 1, base; 2, pedestal; 3, push rod; 4, push block; 5, test piece seat; 6, automatic feeding assembly; 7, visual sensor; 8, protective net; 9, pendulum assembly; 10, power mechanism; 61, transverse driving piece; 62, height adjusting assembly; 63, rotating seat; 64, adsorption plate; 65, positioning plate; 91, pendulum seat; 92, pendulum rod; 93, cutter body; 94, cutter seat; 95, elastic element; 96, guide rod; 97, measuring assembly; 98, locking assembly; 971, arc plate; 972, pressure sensor array; 973, protective layer; 974, synchronous wheel; 975, pressing needle; 981, mounting plate; 982, clamping plate; 983, connecting rod; 984, micro telescopic rod; 985, driving wheel. DETAILED DESCRIPTION

[0024] The terms "first", "second", and the like in the description and in the claims of the present application and in the above Summary of the Invention are used for distinguishing between similar objects and not necessarily for describing a specific sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances and are merely employed in the description of embodiments of the present application for descriptive purposes. Furthermore, the terms "comprise", "have", "contain" and "include" and their conjugates, as used in the present application and in the above Summary of the Invention, are used in their open-ended, non-limiting sense to encompass both the stated features and any additional features.

[0025] Embodiment: In the embodiments of the present application, please refer to Figures 1-5 , a pendulum impact test device for steel pipes is provided, which comprises a base 1, a pedestal 2 fixed on the base 1, a power mechanism 10 fixed on the pedestal 2, and a power output end of the power mechanism 10. A pendulum assembly 9 is installed on the power output end, and a protective net 8 is arranged on one side of the base 1. A test piece seat 5 corresponding to the pendulum assembly 9 is also fixed on the base 1. A visual sensor 7 for observing test pieces on the test piece seat 5 is arranged in the space above the base 1. An automatic feeding assembly 6 for automatic feeding is also arranged in the space above the base 1. During the test, the automatic feeding assembly 6 provides a first test piece, at this time the pendulum assembly 9 impacts the first test piece at a first speed and a first impulse, then the automatic feeding assembly 6 provides a second test piece, and the pendulum assembly 9 adjusts its parameters based on the damage degree of the first test piece and impacts the second test piece at a second speed and a second impulse.

[0026] The test piece seat 5 is provided with a clamp for installing a U-shaped notch test piece, and the U-shaped notch radius is not less than 1 mm.

[0027] Further, the middle part of the base 2 is provided with a push rod 3, and the output end of the push rod 3 is provided with a push block 4 corresponding to the test piece seat 5, which is used for positioning the test piece or carrying out the unloading operation on the first test piece.

[0028] Therefore, at the beginning of the test, the automatic feeding assembly 6 delivers the first test piece (such as a steel pipe sample) to the test piece seat 5. The power mechanism 10 drives the pendulum assembly 9 to impact the first test piece at a preset first speed and first impulse. The visual sensor 7 captures the damage morphology of the first test piece, providing real-time data for subsequent analysis.

[0029] Then, the first test piece on the test piece seat 5 is pushed away by the push rod 3 cooperating with the push block 4, and the automatic feeding assembly 6 subsequently provides the second test piece. The pendulum assembly 9 adjusts its parameters based on the damage degree of the first test piece, and impacts the second test piece at a second speed and a second impulse.

[0030] That is, through the automatic feeding assembly 6 and the visual sensor 7, the automatic delivery and real-time observation of the test piece are realized, reducing manual operation, reducing human error, and improving test consistency and safety.

[0031] And the pendulum assembly 9 can dynamically adjust the parameters based on the damage degree of the first test piece for the second impact. This allows the device to optimize the impact conditions for different material properties (such as toughness or brittleness), improving test accuracy and reliability.

[0032] In addition, the power mechanism 10 can be any one of an electric motor, a hydraulic motor or a pneumatic motor.

[0033] In the embodiment, the first speed is controlled within the range of 2.0 m / s-3.0 m / s, and the first energy is set to 40%-60% of the estimated fracture energy of the material; the damage morphology and crack propagation data of the first test piece are collected by the visual sensor 7, and the displacement data during the impact are collected by the measuring assembly 97 inside the pendulum assembly 9; based on the damage morphology, crack propagation data and displacement data, the response characteristics of the material are comprehensively judged to be brittle or tough; and the second speed is the standard test speed of 5.0 m / s-5.5 m / s.

[0034] Among them, the pendulum assembly 9 impacts the first test piece at a first speed. The speed range is lower than the standard impact speed, which can avoid the complete fracture of the test piece and only excite local damage. The first impact energy is set to 40%-60% of the estimated fracture energy of the material. For example, if the estimated fracture energy is 100 J, the actual impact energy is 40 J-60 J. This energy range can not only cause observable damage, but also retain the integrity of the test piece, providing a basis for subsequent analysis.

[0035] Among them, if the crack propagation is rapid, the displacement data is abrupt, and the damage morphology presents a flat fracture surface, it is determined as a brittle material.

[0036] If the crack propagation is slow, the displacement data changes smoothly, and the fracture morphology shows obvious necking or shear lip, it is determined that the material is ductile.

[0037] In addition, the visual sensor 7 and the complementary data of the measurement assembly 97 cross-verify, which improves the accuracy of the material response characteristic judgment. For example, the crack propagation data and the displacement mutation together confirm the brittle fracture, reducing misjudgment.

[0038] It needs to be explained that although the device is mainly used for steel pipe testing, there are significant material performance differences among steel pipes themselves, and the brittle-ductile difference of different grades of steel pipes (such as Q235 low carbon steel and X80 pipeline steel) is large.

[0039] In addition, in the traditional single impact test, a fixed impact energy is used, and only the impact absorbed work is recorded, lacking dynamic information such as crack propagation behavior and deformation process. Brittle materials directly break under standard energy, and subsequent performance data cannot be obtained; ductile materials may not be fully tested due to insufficient energy.

[0040] Therefore, in the embodiment, when the test piece is determined to be a ductile response, the second energy is set to be higher than the standard impact energy value; when the test piece is determined to be a brittle response, the second energy is set to be the standard impact energy value or slightly lower than the standard impact energy value.

[0041] Further, the visual sensor 7 is a high-speed camera with a frame rate not less than 1000 frames / s.

[0042] Further, the pendulum assembly 9 includes: a pendulum seat 91 connected to the power output end through a pendulum rod 92; a knife seat 94 connected to the pendulum seat 91 through an elastic element 95; a knife body 93 detachably connected to the knife seat 94; a guide rod 96 fixed to the side of the knife seat 94 away from the knife body 93, the guide rod 96 slidingly extends into the pendulum seat 91; the pendulum seat 91 is also provided with a measurement assembly 97 corresponding to the guide rod 96 and a locking assembly 98; when the first test piece is impacted, the locking assembly 98 is in a loosened state, and the measurement assembly 97 measures the displacement data during the impact process.

[0043] When the second test piece is impacted, the locking assembly 98 locks the guide rod 96, so that the knife seat 94 and the pendulum seat 91 form a rigid connection.

[0044] The knife seat 94 is flexibly connected with the pendulum seat 91 through the elastic element 95 (such as a spring or a rubber buffer pad), forming a deformable elastic system. The knife body 93 is detachably fixed to the knife seat 94, facilitating replacement of different specifications of impact cutters. The guide rod 96 is fixed to the tail of the knife seat 94 and is slidably embedded in the guide hole of the pendulum seat 91, limiting the movement of the knife seat 94 only in the impact direction.

[0045] The measurement assembly 97 comprises a synchronous wheel 974 rotatably arranged in the pendulum seat 91 and cooperating with the rack on the guide rod 96, an arc plate 971 fixed in the pendulum seat 91 and arranged concentrically with the synchronous wheel 974, a pressure sensor array 972 composed of a plurality of pressure sensors sequentially attached to one side of the arc plate 971 close to the synchronous wheel 974, and a pressing needle 975 fixed to the synchronous wheel 974 and rotating with the synchronous wheel 974 to press the pressure sensor array 972.

[0046] In this embodiment, the synchronous wheel 974 is rotatably arranged in the interior of the pendulum seat 91 and meshes with the rack on the guide rod 96. When the guide rod 96 moves linearly, the synchronous wheel 974 is driven to rotate. In addition, the pressure sensor array 972 is composed of a plurality of (such as 8-16) thin-film pressure sensors uniformly distributed along the circumference of the arc plate 971. The linear displacement of the guide rod 96 drives the synchronous wheel 974 to rotate through the rack, and the pressing needle 975 rotates with the synchronous wheel 974 to press the pressure sensors at different positions in sequence.

[0047] For example, when the pressing needle 975 contacts the first sensor, the output signal S1 corresponds to the displacement ΔL1; when it rotates to the second sensor, the output signal S2 corresponds to the displacement ΔL2.

[0048] Further, the outer surface of the pressure sensor array 972 is provided with a protective layer 973, and the part of the pressing needle 975 in contact with the protective layer 973 is spherical.

[0049] In this embodiment, the locking assembly 98 comprises a mounting plate 981 fixedly embedded in the pendulum seat 91, a drive wheel 985 rotatably arranged in the pendulum seat 91 and cooperating with the rack on the guide rod 96, at least two symmetrically arranged clamping plates 982, one end of each clamping plate 982 being hingedly connected to the mounting plate 981 and the other end being hingedly connected to a connecting rod 983, and the connecting rod 983 being driven by a micro telescopic rod 984. When the micro telescopic rod 984 is retracted, the connecting rod 983 is pulled to move downward. The connecting rod 983 drives the clamping plates 982 to rotate inward around the hinge point of the mounting plate 981, symmetrically clamping the drive wheel 985.

[0050] The automatic feeding assembly 6 comprises a transverse driving member 61 having a transverse driving end, a height adjusting assembly 62 fixed to the transverse driving end, the height adjusting assembly 62 having a height adjusting end, a rotating seat 63 fixed to the height adjusting end, the rotating seat 63 having a rotating end, and a suction plate 64 fixed to the rotating end, the suction plate 64 being provided with a suction structure for sucking a test piece, and the suction plate 64 being further provided with a positioning plate 65.

[0051] In implementation, the transverse driving member 61 moves to a test piece storage area, the height adjusting assembly 62 is lowered to make the suction plate 64 contact a test piece surface, the suction structure is started (for example, a vacuum chuck generates negative pressure), the test piece is sucked, and then the whole assembly is lifted up. The rotating seat 63 drives the suction plate 64 to rotate, so that the test piece can be closer to the test piece seat 5, then the transverse driving member 61 transports the test piece to above the test piece seat 5, the height adjusting assembly 62 is lowered to a preset height, the suction structure releases the test piece, and the test piece is placed on the test piece seat 5.

[0052] At this time, the position of the test piece can be adjusted again by the push rod 3 and the push block 4 according to the feedback of the visual sensor 7, so that the test piece is centered.

[0053] The above describes only the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent replacement or change according to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A pendulum impact testing device for steel pipes, characterized by comprising: It comprises a base (1), a pedestal (2) fixed on the base (1), a power mechanism (10) fixed on the pedestal (2), the power mechanism (10) having a power output end, and a pendulum assembly (9) installed on the power output end; The base (1) is also fixed with a test piece seat (5) corresponding to the pendulum assembly (9); The space above the base (1) is also provided with a visual sensor (7) for observing the test piece on the test piece seat (5); The space above the base (1) is also provided with an automatic feeding assembly (6) for automatic feeding; During the test, the automatic feeding assembly (6) provides a first test piece, at this time the pendulum assembly (9) impacts the first test piece at a first speed and a first impulse, then the automatic feeding assembly (6) provides a second test piece, the pendulum assembly (9) adjusts its parameters based on the damage degree of the first test piece, and impacts the second test piece at a second speed and a second impulse.

2. A Charpy impact test apparatus for steel pipes according to claim 1, characterized in that The first speed is controlled within the range of 2m / s-3m / s, and the first energy is set to 40%-60% of the estimated fracture energy of the material; The visual sensor (7) collects the damage morphology and crack propagation data of the first test piece, and the displacement data during the impact process is collected by the measuring assembly (97) inside the pendulum assembly (9); Based on the damage morphology, crack propagation data and displacement data, the response characteristics of the material are comprehensively judged to be brittle or ductile; The second speed is the standard test speed of 5m / s-5.5m / s.

3. A Charpy impact test apparatus for steel pipes according to claim 1, characterized in that The visual sensor (7) is a high-speed camera with a frame rate of not less than 1000 frames / second.

4. A Charpy impact test apparatus for steel pipes according to claim 1, characterized in that The middle part of the pedestal (2) is provided with a push rod (3), the output end of the push rod (3) is provided with a push block (4) corresponding to the test piece seat (5), and the push rod (3) and the push block (4) are used for positioning the test piece or performing the unloading operation on the first test piece.

5. A Charpy impact test apparatus for a steel pipe according to claim 1, characterized by The pendulum assembly (9) comprises: A pendulum seat (91) connected to the power output end through a pendulum rod (92); A cutter seat (94) connected to the pendulum seat (91) through an elastic element (95); A cutter body (93) detachably connected to the cutter seat (94); A guide rod (96) fixed to the side of the cutter seat (94) away from the cutter body (93), the guide rod (96) slidingly extends into the pendulum seat (91); The pendulum seat (91) is also provided with a measuring assembly (97) corresponding to the guide rod (96) and a locking assembly (98); When impacting the first test piece, the locking assembly (98) is in a loosened state, and the measuring assembly (97) measures the displacement data during the impact process; When impacting the second test piece, the locking assembly (98) locks the guide rod (96), so that the cutter seat (94) and the pendulum seat (91) form a rigid connection.

6. A Charpy impact test apparatus for steel pipes according to claim 5, wherein The measuring assembly (97) comprises: A synchronous wheel (974) rotationally arranged in the pendulum seat (91) and matched with a rack on the guide rod (96); An arc plate (971) fixed in the pendulum seat (91) and arranged concentrically with the synchronous wheel (974); A pressure sensor array (972) is formed by a plurality of pressure sensors sequentially attached to the arc plate (971) near the side of the synchronization wheel (974); A pressing needle (975) is fixed on the synchronization wheel (974) and rotates with the synchronization wheel (974) and presses the pressure sensor array (972).

7. A Charpy impact test apparatus for steel pipes according to claim 6, wherein The outer surface of the pressure sensor array (972) is provided with a protective layer (973), and the part of the pressing needle (975) in contact with the protective layer (973) is spherical.

8. A Charpy impact testing apparatus for steel pipes according to claim 5, wherein The locking assembly (98) comprises: A mounting plate (981) fixedly embedded in the pendulum seat (91); A driving wheel (985) rotationally arranged in the pendulum seat (91) and matched with the rack on the guide rod (96); At least two symmetrically arranged clamping plates (982), one end of the clamping plate (982) being hingedly connected to the mounting plate (981), the other end being hingedly connected to a connecting rod (983), and the connecting rod (983) being driven by a micro telescopic rod (984).

9. A Charpy impact test apparatus for steel pipes according to claim 1, characterized by The automatic feeding assembly (6) comprises: A transverse driving member (61) having a transverse driving end; A height adjusting assembly (62) fixed to the transverse driving end, and the height adjusting assembly (62) having a height adjusting end; A rotating seat (63) fixed to the height adjusting end, and the rotating seat (63) having a rotating end; An adsorption plate (64) fixed to the rotating end, the adsorption plate (64) being provided with an adsorption structure for adsorbing a test piece, and the adsorption plate (64) further being fixed with a positioning plate (65).

10. A Charpy impact test apparatus for steel pipes according to claim 1, characterized in that, When it is judged that the test piece is a ductile response, the second energy is set to be higher than the standard impact energy value; when it is judged that the test piece is a brittle response, the second energy is set to be the standard impact energy value or slightly lower than the standard impact energy value.

Images