A steel pipe bending resistance detection device and detection method

Abstract

The invention discloses a device and method for detecting the anti-bending performance of a steel pipe, comprising a base, a support base, a pressing mechanism and a control module, wherein the support base is arranged on the base, and at least one group of support arms is arranged on the support base, the support arms are used to support the steel pipe and limit the steel pipe, the pressing mechanism is arranged above the support base, and the pressing mechanism is used to squeeze the steel pipe; the control module is arranged on the support base, and the control module is used to control the movement of the pressing mechanism; the pressing mechanism is fixed above the support base, and pressure sensors are arranged between the support arms on the support base, and the spacing between the pressure sensors at the bottom of each group of steel pipes and the corresponding steel pipes is kept consistent, when the pressing mechanism presses down on the steel pipe, the squeezed part of the steel pipe is deformed and contacts the pressure sensor, the pressure sensor sends the contact data to the controller, the controller sends a stop command to the corresponding electric hydraulic rod, and the bending resistance of the steel pipes of the same batch is judged by the detection data of multiple groups of steel pipes, and the monitoring data is accurate and reliable.

Description

Technical Field

[0001] The invention belongs to the technical field of steel pipe production and manufacturing, and specifically relates to a steel pipe anti-bending performance detection device and a detection method. Background Art

[0002] Steel pipes have a wide range of applications and are mostly used in many fields such as automobile manufacturing, military industry, aviation, etc. Some parts processed from steel pipes, such as steering shafts, load-bearing shafts, etc., need to have strong bending resistance. The bending resistance needs to be preliminarily tested after the steel pipes are processed and formed. Sampling inspection is usually used. Several steel pipes are randomly selected from a batch of steel pipes for cutting and testing. The detection method is to extrude them through external pressure. Under a certain force, the deformation is observed to determine whether their bending resistance meets the standard. Traditional detection devices usually press down the steel pipe through an external hydraulic mechanism or an electric push rod mechanism, but the bottom of the steel pipe breaks during the pressing process, which may cause the pressure data to change too large and too fast, the data to be unstable, the test results to be inaccurate, and other problems, and it is impossible to accurately judge the bending resistance of the steel pipe. Summary of the invention

[0003] The purpose of the present invention is to provide a device and method for detecting the anti-bending performance of a steel pipe. A support seat is installed on a base, a pressing mechanism is fixed above the support seat, and pressure sensors are arranged between the support arms on the support seat. The distance between the pressure sensors at the bottom of each group of steel pipes and their corresponding steel pipes is kept consistent. When the pressing mechanism presses down on the steel pipe, the squeezed part of the steel pipe is deformed and contacts the pressure sensor. The pressure sensor sends the contact data to the controller, and the controller sends a stop command to the corresponding electric hydraulic rod. The anti-bending performance of steel pipes in the same batch is judged by the detection data of multiple groups of steel pipes, and the monitoring data is accurate and reliable.

[0004] The present invention is achieved through the following technical solutions: A device for detecting the bending resistance of a steel pipe comprises a base, a support base, a pressing mechanism and a control module. The support base is arranged on the base. At least one set of support arms is arranged on the support base. The support arms are used to support and limit the steel pipe. The pressing mechanism is arranged above the support base. The pressing mechanism is used to squeeze the steel pipe. The control module is arranged on the support base. The control module is used to control the movement of the pressing mechanism.

[0005] Furthermore, three groups of support arms are arranged on the support seat, and each group of support arms is arranged at intervals. Limiting grooves are arranged at the ends of the support arms, and the steel pipe cooperates with the limiting grooves, and the limiting grooves are used to limit the steel pipe.

[0006] Furthermore, the pressing mechanism includes a support frame, a pressure head and three groups of electric hydraulic rods, the two ends of the support frame are connected to the upper and lower ends of the support seat, the middle part of the support frame is spaced apart from the surface of the support seat, and the electric hydraulic rod is arranged on the support frame; the support frame is provided with a mounting hole, the ends of the electric hydraulic rod are arranged through the mounting hole, and the ends of the electric hydraulic rods are provided with pressure heads.

[0007] Furthermore, the control module includes a controller and multiple pressure sensors, the pressure sensors are arranged on the support seat, a pressure sensor is arranged between each group of support arms, the pressure sensor is arranged directly below the pressure head, and the controller is respectively connected to the pressure sensor and the electric hydraulic rod.

[0008] Furthermore, a fixing hole is provided on the support seat, and the pressure sensor is arranged in the fixing hole.

[0009] Furthermore, a groove is provided on the base, a limit pin is provided in the groove, a limit hole is correspondingly provided on the bottom of the support seat, and the limit pin is used to limit the support seat.

[0010] Furthermore, the groove is provided with making way grooves at the upper and lower ends thereof, and the making way grooves are used to make way for the support frame.

[0011] A method for testing the bending resistance of a steel pipe, wherein the bending resistance of the steel pipe is tested by the above-mentioned device for testing the bending resistance of the steel pipe, comprises the following steps: S1: Cut the same steel pipe into three equal parts of the same length and place them on three sets of support arms respectively; S2: Replace the appropriate indenter according to the test requirements; S3: Preset pressure parameters of the electric hydraulic rod; S4: Start the electric hydraulic rod to press down and perform a bending test on the steel pipe.

[0012] Further, in step S2, the replacement of a suitable pressure head includes a first pressure head, a second pressure head and a third pressure head, the size of the first pressure head is larger than the size of the second pressure head and the third pressure head; the length of the contact surface between the first pressure head and the steel pipe is 4 cm; the length of the contact surface between the second pressure head and the steel pipe is 3 cm; the length of the contact surface between the third pressure head and the steel pipe is 2 cm.

[0013] Furthermore, in step S4, the anti-bending test is performed on the steel pipe so that the size of the pressure head under the three groups of electric hydraulic rods remains consistent in each anti-bending test.

[0014] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1) In the present invention, a support seat is installed on the base, a pressing mechanism is fixed above the support seat, and pressure sensors are arranged between the support arms on the support seat. The distance between the pressure sensors at the bottom of each group of steel pipes and the corresponding steel pipes is kept consistent. When the pressing mechanism presses down on the steel pipe, the squeezed part of the steel pipe is deformed and contacts the pressure sensor. The pressure sensor sends the contact data to the controller, and the controller sends a stop command to the corresponding electric hydraulic rod. The bending resistance of the steel pipes in the same batch is judged by the detection data of multiple groups of steel pipes, and the monitoring data is accurate and reliable.

[0015] 2) In the present invention, a pressure head is provided at the end of the electric hydraulic rod, and the pressure heads are divided into a first pressure head, a second pressure head and a third pressure head according to different sizes. The contact surface length between the first pressure head and the surface of the steel pipe is the largest, and the contact surface length between the third pressure head and the surface of the steel pipe is the smallest. Pressure heads of different sizes can be replaced according to the application scenarios and testing standards of the product, which can further improve the authenticity and accuracy of the test data. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 It is a structural schematic diagram of the steel pipe anti-bending performance detection device in the present invention.

[0018] Figure 2 It is a structural schematic diagram of the base in the steel pipe anti-bending performance testing device in the present invention.

[0019] Among them: 1-base, 11-groove, 12-allowing groove, 13-limiting pin, 2-support seat, 3-support arm, 31-limiting groove, 4-support frame, 5-electric hydraulic rod, 6-pressure head, 7-pressure sensor, 8-controller. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions 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 only part of the embodiments of the present invention, not all of the embodiments.

[0021] Embodiment 1: A steel pipe anti-bending performance testing device, such as Figure 1 and Figure 2As shown, it includes a base 1, a support base 2, a pressing mechanism and a control module. The base 1 provides a detection reference surface. The support base 2 is arranged on the base 1. Three groups of support arms 3 are arranged on the support base 2. Each group includes two support arms 3 arranged at intervals. The two support arms 3 are located on the same axis. The support arms 3 are used to support and limit the steel pipe. The steel pipe is placed on the support arms 3; the two adjacent groups of support arms 3 are also arranged at intervals. Limiting grooves 31 are arranged on the tops of the support arms 3. The steel pipe cooperates with the limiting grooves 31. The limiting grooves 31 are used to limit the steel pipe to prevent the steel pipe from being displaced when the pressing mechanism squeezes the steel pipe; the pressing mechanism is arranged above the support base 2, and the pressing mechanism is used to squeeze the steel pipe downward to detect the bending resistance of the steel pipe; the control module is arranged on the support base 2, and the control module is used to control the movement of the pressing mechanism.

[0022] Embodiment 2: On the basis of the above embodiments, the present embodiment further defines a pressing mechanism and a base 1, the pressing mechanism comprises a support frame 4, a pressure head 6 and three groups of electric hydraulic rods 5, the two ends of the support frame 4 are connected to the upper and lower ends of the support seat 2, the middle part of the support frame 4 is located above the support seat 2 and is spaced apart from the support seat 2, the height of the support frame 4 is higher than the height of the support arm 3, the electric hydraulic rod 5 is arranged on the support frame 4; three mounting holes are arranged on the support frame 4, the ends of the three electric hydraulic rods 5 pass through the corresponding mounting holes respectively and are fixed on the support frame 4, the ends of the electric hydraulic rods 5 are all provided with pressure heads 6, the pressure heads 6 are threadedly connected to the ends of the electric hydraulic rods 5, and pressure heads 6 of different sizes can be replaced according to the detection requirements; the sizes of the pressure heads 6 are divided into large, medium and small sizes, which are the first pressure head 6, the second pressure head 6 and the third pressure head 6 respectively, and the size of one pressure head 6 is larger than the second pressure head 6 and the third pressure head 6 The size of the head 6; the length of the contact surface between the first pressure head 6 and the steel pipe is 4cm; the length of the contact surface between the second pressure head 6 and the steel pipe is 3cm; the length of the contact surface between the third pressure head 6 and the steel pipe is 2cm. According to different detection requirements, a suitable pressure head 6 is installed accordingly. The smaller the pressure head 6 is, the smaller the contact surface between it and the surface of the steel pipe is. Under the same pressure condition, the pressure is greater, and the strength requirement of the steel pipe material is higher; a groove 11 is provided on the base 1, and four limit pins 13 are provided in the groove 11. A limit hole is correspondingly provided on the bottom of the support seat 2, and the support seat 2 is plug-fitted and connected with the limit pins 13; a clearance groove 12 is provided at the upper and lower ends of the groove 11. When the support seat 2 and the support frame 4 are installed on the groove 11 of the base 1, the clearance groove 12 can make way for the support frame 4. The support frame 4 is welded to the support seat 2 to ensure that it can withstand the reverse force of the electric hydraulic rod 5. The other parts of this embodiment are the same as the above-mentioned embodiments, and will not be repeated here.

[0023] Embodiment 3: On the basis of the above embodiment, the present embodiment further defines the control module, which includes a controller 8 and three pressure sensors 7. The three pressure sensors 7 are all arranged on the support seat 2 and located between each group of support arms 3. The pressure sensor 7 is arranged directly below the pressure head 6. The support seat 2 is provided with three fixing holes. The pressure sensor 7 is arranged in the fixing holes and protrudes on the surface of the support seat 2. The tops of the three pressure sensors 7 are on the same horizontal plane to ensure that the spacing between each steel pipe and the pressure sensor 7 is the same, thereby improving the detection accuracy; the controller 8 is arranged on the side of the support frame 4 and connected to the support frame 4. The controller 8 is electrically connected to the pressure sensor 7 and the electric hydraulic rod 5 respectively; when the electric hydraulic rod 5 presses down to bend the steel pipe, the pressure data of the electric hydraulic rod 5 is fed back to the controller 8 in real time. When the bottom of the steel pipe is bent and abuts against the pressure sensor 7 in the later stage, the pressure sensor 7 receives the pressure signal and sends it to the controller 8. The controller 8 immediately sends a stop command to the corresponding electric hydraulic rod 5 and records the final pressure data. The reliability of the detection data is determined by comparing the three groups of data. The other parts of the present embodiment are the same as the above embodiment and will not be repeated here.

[0024] Embodiment 4: A method for testing the bending resistance of a steel pipe, wherein the bending resistance of the steel pipe is tested by the above-mentioned device for testing the bending resistance of the steel pipe, comprises the following steps: S1: Cut the same steel pipe into three equal parts of the same length and place them on three groups of support arms 3 respectively; S2: Replace the appropriate pressure head 6 according to the test requirements; S3: Preset the pressure parameters of the electric hydraulic rod 5; S4: Start the electric hydraulic rod 5 to press down and perform a bending resistance test on the steel pipe.

[0025] The same steel pipe is cut into three equal parts and each steel pipe is preliminarily inspected for old damage or deformation. After confirmation, the three steel pipes are placed on the support arm 3 respectively. According to the application scenario of the product or the size of the contact surface, a corresponding size of the pressure head 6 can be used to extrude the steel pipe; the pressure head 6 includes a first pressure head 6, a second pressure head 6 and a third pressure head 6. The size of the first pressure head 6 is larger than that of the second pressure head 6 and the third pressure head 6. The length of the contact surface between the first pressure head 6 and the steel pipe is 4 cm, the length of the contact surface between the second pressure head 6 and the steel pipe is 3 cm, and the length of the contact surface between the third pressure head 6 and the steel pipe is 2 cm; when replacing the pressure head 6, ensure that the pressure head 6 under each electric hydraulic rod 5 is of the same size to ensure the accuracy of the monitoring data; finally, analyze and judge whether the bending resistance performance of the steel pipe meets the standard based on the actual pressure parameters borne by multiple steel pipes in the same batch of steel pipes.

[0026] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. used to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship commonly placed when the product of the invention is used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0027] In addition, if the terms "horizontal" or "vertical" appear in the description of the present invention, it does not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A device for detecting the bending resistance of a steel pipe, characterized in that: It includes a base, a support seat, a pressing mechanism and a control module. The support seat is arranged on the base. At least one group of support arms is arranged on the support seat. The support arms are used to support the steel pipe and limit the steel pipe. The pressing mechanism is arranged above the support seat and is used to squeeze the steel pipe. The control module is arranged on the support seat and is used to control the movement of the pressing mechanism.

2. The device for detecting the bending resistance of a steel pipe according to claim 1, characterized in that: The support seat is provided with three groups of support arms, each group of support arms is arranged at intervals, and the end of the support arm is provided with a limiting groove, the steel pipe cooperates with the limiting groove, and the limiting groove is used to limit the steel pipe.

3. The device for detecting the bending resistance of a steel pipe according to claim 2, characterized in that: The pressing mechanism includes a support frame, a pressure head and three groups of electric hydraulic rods, the two ends of the support frame are connected to the upper and lower ends of the support seat, the middle part of the support frame is spaced apart from the surface of the support seat, and the electric hydraulic rod is arranged on the support frame; the support frame is provided with a mounting hole, the ends of the electric hydraulic rod are arranged through the mounting hole, and the ends of the electric hydraulic rods are both provided with pressure heads.

4. The device for testing the bending resistance of a steel pipe according to claim 3, characterized in that: The control module includes a controller and multiple pressure sensors. The pressure sensors are arranged on the support seat. Pressure sensors are arranged between each group of support arms. The pressure sensors are arranged directly below the pressure head. The controller is connected to the pressure sensors and the electric hydraulic rod respectively.

5. The steel pipe anti-bending performance testing device according to claim 4, characterized in that: The support seat is provided with a fixing hole, and the pressure sensor is arranged in the fixing hole.

6. The device for testing the bending resistance of a steel pipe according to claim 3, characterized in that: The base is provided with a groove, a limiting pin is provided in the groove, a limiting hole is correspondingly provided on the bottom of the support seat, and the limiting pin is used to limit the support seat.

7. The steel pipe anti-bending performance testing device according to claim 6, characterized in that: The groove is provided with clearance grooves at the upper and lower ends thereof, and the clearance grooves are used to make way for the support frame.

8. A method for testing the bending resistance of a steel pipe, characterized in that: The bending resistance test of a steel pipe is carried out by using the steel pipe bending resistance test device as described in any one of claims 1 to 7, comprising the following steps: S1: Cut the same steel pipe into three equal parts of the same length and place them on three sets of support arms respectively; S2: Replace the appropriate indenter according to the test requirements; S3: Preset pressure parameters of the electric hydraulic rod; S4: Start the electric hydraulic rod to press down and perform a bending test on the steel pipe.

9. The method for testing the bending resistance of a steel pipe according to claim 8, characterized in that: In step S2, the appropriate pressure head is replaced, and the pressure head includes a first pressure head, a second pressure head and a third pressure head. The size of the first pressure head is larger than the size of the second pressure head and the third pressure head; the length of the contact surface between the first pressure head and the steel pipe is 4 cm; the length of the contact surface between the second pressure head and the steel pipe is 3 cm; the length of the contact surface between the third pressure head and the steel pipe is 2 cm.

10. The method for testing the bending resistance of a steel pipe according to claim 9, characterized in that: In step S4, the steel pipe is subjected to a bending resistance test so that the sizes of the pressure heads under the three groups of electric hydraulic rods remain consistent in each bending resistance test.

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