A stiffness testing machine for large-diameter pipe specimens

Abstract

This utility model discloses a stiffness testing machine for large-diameter pipe specimens, belonging to the field of stiffness testing technology. It includes a frame with a base plate fixedly connected to its bottom and a pressure plate on the frame. Measuring rods are detachably connected to both the pressure plate and the base plate. It also includes a driving mechanism for moving the pressure plate. Two sets of measuring rods penetrate the specimen ring, acting as a limit to prevent large displacement of the specimen ring during pressure application by the pressure plate, thus ensuring the accuracy of the data measured by the stiffness testing machine.

Description

Technical Field

[0001] This utility model relates to the field of stiffness testing technology, and in particular to a stiffness testing machine for large-diameter pipe specimens. Background Technology

[0002] In mechanical equipment, in order to verify whether the components used can meet the requirements, such as their stiffness, a sample is usually made first and tested using a stiffness testing machine to see if it meets the requirements.

[0003] For some large-diameter ring-shaped parts, due to their large size, it is necessary to conduct stiffness tests to prevent accidental deformation during use and ensure that they can work safely and stably.

[0004] However, when using existing stiffness testing machines to test the stiffness of some large-diameter pipe specimens, the large size makes it difficult for the testing personnel to place the specimens precisely, resulting in significant errors in the measured data. Utility Model Content

[0005] The purpose of this invention is to solve the technical problem in the prior art where the large size of the specimen makes it difficult for the tester to place it accurately, resulting in large errors in the data measured by the stiffness testing machine. Therefore, this invention proposes a stiffness testing machine for large-diameter pipe specimens.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A stiffness testing machine for large-diameter pipe specimens includes a frame, a base plate fixedly connected to the bottom of the frame, and a pressure plate on the frame; measuring rods are detachably connected to both the pressure plate and the base plate; and a driving mechanism is also included, which is used to drive the pressure plate to move.

[0008] Preferably, a wire encoder is connected between the pressure plate and the base plate.

[0009] Preferably, a pressure block is slidably connected inside the frame, and a pressure plate is connected to the bottom of the pressure block; a pressure sensor is installed between the pressure plate and the pressure block; and the driving mechanism drives the pressure block to move.

[0010] Preferably, a guide rod is fixedly connected inside the frame, and the pressure block is slidably connected to the guide rod.

[0011] Preferably, the driving mechanism includes a motor and a threaded rod; the threaded rod is rotatably connected to the frame body, the pressure block is threadedly connected to the threaded rod, and the motor drives the threaded rod to rotate.

[0012] Preferably, a housing is fixedly connected to the bottom of the frame, and the motor is located inside the housing; there are two sets of threaded rods, both of which extend into the housing; the two sets of threaded rods are connected by a synchronous toothed belt, and the motor drives the synchronous toothed belt to move.

[0013] Preferably, a gearbox is fixedly connected inside the housing, and the output end of the motor is fixedly connected to the input end of the gearbox; the output end of the gearbox and the two sets of threaded rods are all fixedly connected to toothed pulleys, and the synchronous toothed belt meshes on the toothed pulleys.

[0014] Preferably, a support column is fixedly connected inside the box.

[0015] Preferably, the side wall of the enclosure is provided with a side door.

[0016] Preferably, the base plate is fixed to the top of the box.

[0017] Compared with the prior art, this utility model provides a stiffness testing machine for large-diameter pipe specimens, which has the following beneficial effects:

[0018] 1. The stiffness testing machine for this large-diameter specimen uses two sets of measuring rods that pass through the specimen ring to limit its movement, preventing large displacement of the specimen ring during the pressure applied by the pressure plate, thus ensuring the accuracy of the data measured by the stiffness testing machine.

[0019] 2. In the stiffness testing machine for large-diameter specimens, during the process of the pressure block driving the pressure plate downward, the pressure sensor measures the pressure applied by the pressure plate to the specimen ring. At the same time, in conjunction with the wire encoder, the deformation generated under the specified pressure is measured, thereby more scientifically determining the stiffness of the specimen ring. Attached Figure Description

[0020] Figure 1 This is a diagram illustrating the working state of a stiffness testing machine for large-diameter pipe specimens proposed in this utility model.

[0021] Figure 2 This is a schematic diagram of the structure of a stiffness testing machine for large-diameter pipe specimens proposed in this utility model;

[0022] Figure 3 A partial structural diagram of a stiffness testing machine for large-diameter pipe specimens proposed in this utility model. Figure 1 ;

[0023] Figure 4 A partial structural diagram of a stiffness testing machine for large-diameter pipe specimens proposed in this utility model. Figure 2 ;

[0024] Figure 5This is a schematic diagram of the threaded rod of a stiffness testing machine for large-diameter pipe specimens proposed in this utility model.

[0025] Figure 6 This is a schematic diagram of the synchronous toothed belt of a stiffness testing machine for large-diameter pipe specimens proposed in this utility model.

[0026] In the diagram: 1. Sample ring; 2. Box body; 201. Frame; 3. Motor; 301. Gearbox; 302. Threaded rod; 303. Synchronous toothed belt; 4. Pressure block; 401. Pressure plate; 402. Pressure sensor; 5. Base plate; 6. Measuring rod; 601. Wire encoder; 7. Guide rod; 8. Support column; 801. Side door. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0028] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] Example:

[0030] like Figures 1-6 A stiffness testing machine for large-diameter pipe specimens includes a frame 201, with a base plate 5 fixedly connected to the bottom of the frame 201, the base plate 5 serving a supporting function. A pressure plate 401 is provided on the frame 201, located above the base plate 5. The large-diameter pipe specimen, i.e., Figure 1 The sample ring 1 is placed between the pressure plate 401 and the base plate 5.

[0031] The lower surface of the pressure plate 401 and the upper surface of the base plate 5 are both provided with grooves, and the sample ring 1 is stuck in the groove.

[0032] Measuring rods 6 are detachably connected to both the pressure plate 401 and the base plate 5. The measuring rods 6 are installed on the lower surface of the pressure plate 401 and the upper surface of the base plate 5.

[0033] It should be noted that both ends of the measuring rod 6 are fixed with vertical poles in the same direction, and the distance between the poles at both ends is greater than the width of the sample ring 1. The measuring rod 6 is inserted into the pressure plate 401 and the base plate 5 through the poles.

[0034] The upright rod is cylindrical with threads on its side wall. After being inserted into the pressure plate 401 and the base plate 5, it is fixed by nuts in the opposite direction of the pressure plate 401 and the base plate 5, so that the measuring rod 6 is in contact with the inner wall of the sample ring 1.

[0035] It also includes a drive mechanism, which is used to drive the pressure plate 401 to move.

[0036] During measurement, the sample ring 1 is first placed on the base plate 5 and located in the groove. Then, the pressure plate 401 is moved downward by the drive mechanism and comes into contact with the top of the sample ring 1. At the same time, the sample ring 1 is in contact with the groove of the pressure plate 401 to prevent the sample ring 1 from moving.

[0037] Then as Figure 1 Install the measuring rod 6, which passes through the sample ring 1, so that the measuring rod 6 is in contact with the inner wall of the sample ring 1, which plays a limiting role and prevents the sample ring 1 from displacing significantly. Then, the pressure plate 401 continues to press down, applying force to the sample ring 1 to test its stiffness.

[0038] The design of the grooves on the pressure plate 401 and the base plate 5 improves the accuracy of the test personnel in placing the sample ring 1. In addition, the two sets of measuring rods 6 pass through the sample ring 1, which further limit the movement and prevent the sample ring 1 from shifting significantly during the pressure applied by the pressure plate 401, thus ensuring the accuracy of the data measured by the stiffness testing machine.

[0039] like Figures 3-4 A wire encoder 601 is connected between the pressure plate 401 and the base plate 5.

[0040] After the pressure plate 401 contacts the top of the sample ring 1, during the continued pressing process, the distance value between the pressure plate 401 and the base plate 5 is measured by the wire encoder 601, thereby determining the degree of deformation of the sample ring 1 and its rigidity.

[0041] like Figure 4 A pressure block 4 is slidably connected inside the frame 201, and a pressure plate 401 is connected to the bottom of the pressure block 4; a pressure sensor 402 is installed between the pressure plate 401 and the pressure block 4; and a drive mechanism drives the pressure block 4 to move.

[0042] The pressure plate 401 is stuck at the bottom of the pressure block 4 and can only move with the pressure block 4.

[0043] During the process of the pressure block 4 driving the pressure plate 401 to press down, the pressure sensor 402 measures the pressure applied by the pressure plate 401 to the sample ring 1. At the same time, in conjunction with the wire encoder 601, the deformation generated under the specified pressure is measured, thereby more scientifically determining the stiffness of the sample ring 1.

[0044] like Figure 4 and Figure 5There are four guide rods 7 fixedly connected inside the frame 201, two on each side of the frame 201, and the pressure block 4 is slidably connected to the guide rods 7.

[0045] The guide rod 7 serves as a guide, improving the smoothness of the sliding of the pressure block 4.

[0046] like Figure 5 and Figure 6 The drive mechanism includes a motor 3 and a threaded rod 302; the threaded rod 302 is rotatably connected inside the frame 201, the pressure block 4 is threadedly connected to the threaded rod 302, and the motor 3 drives the threaded rod 302 to rotate.

[0047] The pressure block 4 has a through hole, and the inner wall of the through hole has an internal thread. The threaded rod 302 is threaded into the through hole.

[0048] Start motor 3 to drive threaded rod 302 to rotate, which in turn drives pressure block 4 to move and apply force to sample ring 1.

[0049] like Figures 1-3 ,as well as Figure 6 The bottom of the frame 201 is fixedly connected to the box 2, the bottom plate 5 is fixed to the top of the box 2, and the motor 3 is located inside the box 2; there are two sets of threaded rods 302, both of which extend into the box 2 and are rotatably connected to the box 2, and the two sets of threaded rods 302 are respectively on both sides of the frame 201.

[0050] The two sets of threaded rods 302 are connected by a synchronous toothed belt 303, and the motor 3 drives the synchronous toothed belt 303 to move.

[0051] Specifically: a gearbox 301 is fixedly connected inside the housing 2, and the output end of the motor 3 is fixedly connected to the input end of the gearbox 301; the output end of the gearbox 301 and the two sets of threaded rods 302 are all fixedly connected to toothed pulleys, and the synchronous toothed belt 303 meshes on the toothed pulleys.

[0052] During operation, the motor 3 drives the synchronous toothed belt 303 to move through the gearbox 301, and then synchronously drives the two sets of threaded rods 302 to rotate, thereby driving the pressure block 4 to move.

[0053] The design of the synchronous toothed belt 303 ensures the consistency of rotation of the two sets of threaded rods 302.

[0054] like Figure 6 The box 2 is fixedly connected to a support column 8.

[0055] There are 4-8 support columns 8, which are distributed at the four corners of the box 2 and below the bottom plate 5. The top of the support column 8 contacts the inner wall of the top of the box 2, and the bottom of the support column 8 contacts the inner wall of the bottom of the box 2, so as to play a supporting role and prevent the box 2 from being deformed due to excessive force when testing the stiffness.

[0056] The bottom of the guide rod 7 is also fixed to the housing 2.

[0057] like Figure 3 The side wall of the enclosure 2 is provided with a side door 801, which facilitates the installation and subsequent maintenance of some components inside the enclosure 2.

[0058] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A stiffness testing machine for large-diameter pipe specimens, comprising a frame (201), characterized in that, The bottom of the frame (201) is fixedly connected to a base plate (5), and a pressure plate (401) is provided on the frame (201). Measuring rods (6) can be detachably connected to both the pressure plate (401) and the base plate (5). It also includes a drive mechanism for driving the pressure plate (401) to move.

2. The stiffness testing machine for large-diameter pipe specimens according to claim 1, characterized in that, A pull-wire encoder (601) is connected between the pressure plate (401) and the base plate (5).

3. The stiffness testing machine for large-diameter pipe specimens according to claim 1, characterized in that, A pressure block (4) is slidably connected inside the frame (201). The pressure plate (401) is connected to the bottom of the pressure block (4); A pressure sensor (402) is installed between the pressure plate (401) and the pressure block (4). The drive mechanism drives the pressure block (4) to move.

4. The stiffness testing machine for large-diameter pipe specimens according to claim 3, characterized in that, The frame (201) is fixedly connected to a guide rod (7), and the pressure block (4) is slidably connected to the guide rod (7).

5. The stiffness testing machine for large-diameter pipe specimens according to claim 3, characterized in that, The drive mechanism includes a motor (3) and a threaded rod (302); The threaded rod (302) is rotatably connected inside the frame (201), and the pressure block (4) is threadedly connected to the threaded rod (302). The motor (3) drives the threaded rod (302) to rotate.

6. The stiffness testing machine for large-diameter pipe specimens according to claim 5, characterized in that, The bottom of the frame (201) is fixedly connected to the box (2), and the motor (3) is located inside the box (2); The threaded rods (302) are in two sets, and both extend into the housing (2); The two sets of threaded rods (302) are connected by a synchronous toothed belt (303), and the motor (3) drives the synchronous toothed belt (303) to move.

7. The stiffness testing machine for large-diameter pipe specimens according to claim 6, characterized in that, The gearbox (301) is fixedly connected inside the housing (2), and the output end of the motor (3) is fixedly connected to the input end of the gearbox (301); The output end of the gearbox (301) and the two sets of threaded rods (302) are all fixedly connected to toothed pulleys, and the synchronous toothed belt (303) meshes on the toothed pulleys.

8. The stiffness testing machine for large-diameter pipe specimens according to claim 6, characterized in that, The box (2) is fixedly connected to a support column (8).

9. The stiffness testing machine for large-diameter pipe specimens according to claim 6, characterized in that, The side wall of the box (2) is provided with a side door (801).

10. The stiffness testing machine for large-diameter pipe specimens according to claim 6, characterized in that, The base plate (5) is fixed to the top of the box (2).

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