MPP ring stiffness tester

Abstract

The utility model discloses an MPP ring stiffness tester which comprises a rack and a pipe to be tested, and further comprises a centering mechanism which is arranged at the top of the rack and is used for fixing and centering the pipe to be tested; the two groups of hydraulic rods are fixedly mounted on the two sides of the rack; and the pressing plate is fixedly connected to the telescopic rod end of the hydraulic rod. According to the utility model, a to-be-measured pipe is firstly placed on the supporting groove with the matched size on the tray, then the driving rod is driven by the driving motor to rotate anticlockwise, and then the driven rod is driven to drive the second rotating shaft and the clamping plate to move close to the to-be-measured pipe along the guide rod until the to-be-measured pipe is clamped; due to the fact that the output shaft of the driving motor, the driving rod and the center line of the tray are coaxially arranged, centering operation of the pipe is completed while the pipe to be tested is clamped, the pipe is prevented from moving or inclining in the later testing process, and deviation of the testing result is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe ring stiffness testing, in particular to an MPP ring stiffness tester. Background Art

[0002] The MPP Ring Stiffness Tester is a device specifically designed to measure the ring stiffness of pipe materials such as plastic and composite pipes. Ring stiffness is an important indicator of a pipe's ability to resist deformation under external pressure. This is crucial for ensuring the stability and safety of pipelines during installation and operation.

[0003] After searching, the Chinese utility model patent with application number 202123104202.5 discloses, "A pipe ring stiffness tester, including a press body, a control panel is provided on the press body, a fixed rod is fixedly installed on the control panel, and a fixed assembly is provided on the fixed rod; the fixed assembly includes a guide rod fixedly connected to the fixed rod, a mounting plate is fixedly installed on the guide rod, a motor is fixedly installed on the bottom of the mounting plate, a screw rod rotatably connected to the mounting plate is fixedly installed on the output end of the motor, a connecting seat is movably installed on the outside of the screw rod, and a pressure plate is fixedly installed on the end of the connecting seat away from the screw rod." During the ring stiffness test, the pipe needs to be centered before testing, but the centering mechanism in the ring stiffness tester has poor synchronization, resulting in errors in the test results. Utility Model Content

[0004] The purpose of the present invention is to provide an MPP ring stiffness tester in order to solve the technical problems mentioned in the above background technology.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] An MPP ring stiffness tester includes a frame and a pipe to be tested, and further includes:

[0007] The centering mechanism is installed on the top of the frame and is used to fix and center the pipe to be tested;

[0008] There are two sets of hydraulic rods, which are fixed on both sides of the frame;

[0009] A pressure plate, fixedly connected to the telescopic rod end of the hydraulic rod;

[0010] There are four sets of guide posts, which are fixed around the frame;

[0011] The tray is slidingly mounted on the bottom side of the guide post and is used to support the pipe to be tested;

[0012] The spring is sleeved on the guide post, and both ends of the spring are fixedly connected to the tray and the frame respectively;

[0013] There are two sets of inner wall measuring components installed on both sides of the bottom of the tray to measure the deformation of the compressed pipe to be tested.

[0014] As a further description of the above technical solution:

[0015] The centering mechanism comprises:

[0016] The driving motor is fixedly installed on the top of the frame;

[0017] An active rod is fixedly sleeved on the output shaft of the driving motor;

[0018] The driven rod is provided in two groups and is rotatably connected to both ends of the active rod through the first rotating shaft;

[0019] A second rotating shaft is rotatably sleeved on the free end of the driven rod;

[0020] A clamping plate, fixedly sleeved on the second rotating shaft;

[0021] The guide rod is fixedly connected to the frame and horizontally passes through the two groups of second rotating shafts.

[0022] As a further description of the above technical solution:

[0023] The clamping plate is an L-shaped structure, the horizontal end of the clamping plate is a fan-shaped plate, and the vertical end of the clamping plate is an arc-shaped plate.

[0024] As a further description of the above technical solution:

[0025] The tray is provided with a plurality of supporting grooves with different inner diameters along the axial direction, and a sliding groove is located at the bottom of the tray.

[0026] As a further description of the above technical solution:

[0027] The inner wall measurement assembly comprises:

[0028] There are two sets of measuring plates, symmetrically arranged on both sides of the chute;

[0029] The slide rod has an L-shaped structure, the horizontal end of the slide rod is fixedly connected to the measuring platen, and the vertical end of the slide rod passes through the slide slot;

[0030] A fixed seat, fixedly connected to the bottom of the tray;

[0031] The adjusting screw is screwed together with the fixing seat, and one end of the adjusting screw is rotationally matched with the vertical end of the sliding rod.

[0032] As a further description of the above technical solution:

[0033] Through slots are provided at both ends of the frame.

[0034] To sum up, due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows: in the present invention, the pipe to be tested is first placed on a supporting groove of matching size on the pallet, and then the driving motor drives the active rod to rotate counterclockwise, thereby driving the driven rod to drive the second rotating shaft and the clamping plate to move along the guide rod close to the pipe to be tested until the pipe to be tested is clamped. At this time, the pipe will not fall even if it loses the supporting effect of the pallet. The pallet plays the role of rough positioning and preliminary support. Since the output shaft of the driving motor, the active rod and the center line of the pallet are coaxially arranged, the centering operation of the pipe is completed while the pipe to be tested is clamped, thereby avoiding the pipe from moving or tilting during the subsequent testing process, thereby avoiding deviations in the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The figure shows a schematic diagram of the three-dimensional structure of an MPP ring stiffness tester provided according to an embodiment of the present utility model;

[0036] Figure 2 A schematic structural diagram of a tray provided according to an embodiment of the present utility model is shown;

[0037] Figure 3 A schematic structural diagram of an inner wall measurement assembly according to an embodiment of the present utility model is shown;

[0038] Figure 4 A structural schematic diagram of a centering mechanism provided according to an embodiment of the utility model is shown.

[0039] Legend:

[0040] 1. Frame; 101. Through slot; 2. Spring; 3. Centering mechanism; 31. Driving motor; 32. Active rod; 33. Driven rod; 341. First rotating shaft; 342. Second rotating shaft; 35. Guide rod; 36. Clamping plate; 4. Pipe to be measured; 5. Guide column; 6. Pressure plate; 7. Hydraulic rod; 8. Pallet; 801. Supporting slot; 802. Slide slot; 9. Inner wall measuring assembly; 91. Measuring pressure plate; 92. Slide rod; 93. Adjusting screw; 94. Fixing seat. DETAILED DESCRIPTION

[0041] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only 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 making creative efforts are within the scope of protection of the present invention.

[0042] See also Figure 1-4The utility model provides a technical solution: an MPP ring stiffness tester, including a frame 1 and a pipe to be tested 4, with through slots 101 at both ends of the frame 1, a centering mechanism 3 installed on the top of the frame 1, used to fix and center the pipe to be tested 4, two groups of hydraulic rods 7 are provided, fixedly installed on both sides of the frame 1, a pressure plate 6 is fixedly connected to the telescopic rod end of the hydraulic rod 7, four groups of guide columns 5 are provided, fixedly arranged around the frame, two groups of inner wall measurement components 9 are provided, installed on both sides of the bottom of the tray 8, used to measure the pressure of the pipe to be tested To measure the deformation of the pipe 4, the tray 8 is slidably mounted on the bottom side of the guide column 5 to support the pipe 4 to be measured. The spring 2 is mounted on the guide column 5. The two ends of the spring 2 are fixedly connected to the tray 8 and the frame 1 respectively. Under the elastic force of the spring 2, the pipe 4 to be measured is brought into contact with the horizontal end of the clamping plate 36. The tray 8 is provided with a plurality of supporting grooves 801 with different inner diameters along the axial direction, as well as a slide groove 802 at the bottom of the tray 8. Different supporting grooves 801 can roughly position the bottom of the pipe 4 to be measured with different outer diameters. After the pipe is centered, the hydraulic rod 7 is started to drive the pressure plate 6 to apply pressure to the pipe 4 from both sides until the inner wall of the pipe 4 contacts the test pressure plate. After that, the ring stiffness of the pipe can be calculated according to the ring stiffness calculation formula. The ring stiffness calculation formula is: , where E is the ring stiffness, F is the applied pressure, r is the inner radius of the pipe, I is the moment of inertia of the area, and δ is the radial deformation of the pipe under this pressure.

[0043] Specifically, such as Figure 1 and Figure 4 The centering mechanism 3 shown includes: a driving motor 31 fixedly mounted on the top of the frame 1, an active rod 32 fixedly sleeved on the output shaft of the driving motor 31, two groups of driven rods 33 are provided, which are rotatably connected to the two ends of the active rod 32 through a first rotating shaft 341, and a second rotating shaft 342 is rotatably sleeved on the free end of the driven rod 33, a guide rod 35 is fixedly connected to the frame 1, and the guide rod 35 horizontally passes through the two groups of second rotating shafts 342, and a clamping plate 36 is fixedly sleeved on the second rotating shaft 342. The clamping plate 36 is an L-shaped structure, the horizontal end of the clamping plate 36 is a fan-shaped plate, and the vertical end of the clamping plate 36 is an arc-shaped plate. The pipe 4 to be tested is first placed on the supporting groove 801 of the corresponding size on the tray 8. Then, the driving motor 31 drives the active rod 32 to rotate counterclockwise, and then drives the driven rod 33 to drive the second rotating shaft 342 and the clamping plate 36 to move along the guide rod 35 close to the pipe 4 to be tested until the pipe 4 to be tested is clamped. At this time, even if the pipe 4 loses the supporting effect of the tray 8, it will not fall. The tray 8 plays the role of rough positioning and preliminary support. Since the output shaft of the driving motor 31, the active rod 32 and the center line of the tray 8 are coaxially arranged, the centering operation of the pipe is completed while clamping the pipe 4 to be tested, thereby avoiding movement or tilting of the pipe during the subsequent testing process, thereby avoiding deviations in the test results.

[0044] Specifically, such as Figure 1 and Figure 2 and Figure 3 The inner wall measurement assembly 9 shown includes two sets of measuring platens 91 symmetrically arranged on either side of the slide slot 802. A sliding rod 92 is L-shaped, with the horizontal end of the sliding rod 92 fixedly connected to the measuring platens 91. The vertical end of the sliding rod 92 passes through the slide slot 802, and a fixing seat 94 is fixedly connected to the bottom of the tray 8. An adjusting screw 93 is threadedly connected to the fixing seat 94, and one end of the adjusting screw 93 is rotatably engaged with the vertical end of the sliding rod 92. Rotating the adjusting screws 93 on both sides drives the sliding rod 92, causing the measuring platens 91 to move toward each other, so that the distance between the two sets of measuring platens 91 and the inner wall of the pipe is sufficient to prevent the pipe from deforming in the diameter direction by 3% when under pressure.

[0045] Working principle: When in use, first, the pipe 4 to be tested is placed on the supporting groove 801 of the matching size on the tray 8. Under the elastic force of the spring 2, the pipe 4 to be tested is abutted against the horizontal end of the clamping plate 36. Then, the driving motor 31 drives the active rod 32 to rotate counterclockwise, and then drives the driven rod 33 to drive the second rotating shaft 342 and the clamping plate 36 to move along the guide rod 35 close to the pipe 4 to be tested until the pipe 4 to be tested is clamped. At this time, even if the pipe 4 loses the supporting effect of the tray 8, it will not fall. The tray 8 plays the role of rough positioning and preliminary support. Due to the output shaft of the driving motor 31, the active rod 32 and the tray The center lines of 8 are coaxially arranged to complete the centering operation of the pipe while clamping the pipe 4 to be tested, so as to avoid the pipe from moving or tilting during the subsequent test process, thereby avoiding deviations in the test results. Afterwards, the adjusting screws 93 on both sides are rotated respectively, and the sliding rods 92 are driven to drive the measuring plates 91 to move toward each other, so that the distance between the two sets of measuring plates 91 and the inner wall of the pipe is satisfied, but the deformation in the diameter direction of the pipe when under pressure reaches 3%. Afterwards, the hydraulic rod 7 is started to drive the plate 6 to apply pressure to the pipe 4 from both sides until the inner wall of the pipe 4 contacts the test plate. Finally, the ring stiffness of the pipe can be calculated according to the ring stiffness calculation formula.

[0046] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An MPP ring stiffness tester, comprising a frame (1) and a pipe to be tested (4), characterized in that: Also includes: A centering mechanism (3) is mounted on the top of the frame (1) and is used to fix and center the pipe (4) to be tested; Two sets of hydraulic rods (7) are fixedly mounted on both sides of the frame (1); A pressure plate (6) is fixedly connected to the telescopic rod end of the hydraulic rod (7); Guide pillars (5) are provided in four groups and are fixedly arranged around the frame (1); A tray (8) is provided with a sliding sleeve on the bottom side of the guide post (5) for supporting the pipe (4) to be tested; A spring (2) is sleeved on the guide post (5), and two ends of the spring (2) are fixedly connected to the tray (8) and the frame (1) respectively; Two sets of inner wall measuring components (9) are provided and installed on both sides of the bottom of the tray (8) for measuring the deformation of the pressurized pipe (4) to be tested.

2. An MPP ring stiffness tester according to claim 1, characterized in that, The centering mechanism (3) comprises: A drive motor (31) is fixedly mounted on the top of the frame (1); An active rod (32) is fixedly sleeved on the output shaft of the drive motor (31); The driven rod (33) is provided in two groups and is rotatably connected to both ends of the active rod (32) via a first rotating shaft (341); A second rotating shaft (342) is rotatably sleeved on the free end of the driven rod (33); A clamping plate (36) fixedly sleeved on the second rotating shaft (342); The guide rod (35) is fixedly connected to the frame (1), and the guide rod (35) horizontally passes through the two sets of second rotating shafts (342).

3. An MPP ring stiffness tester according to claim 2, characterized in that, The clamping plate (36) is an L-shaped structure, the horizontal end of the clamping plate (36) is a fan-shaped plate, and the vertical end of the clamping plate (36) is an arc-shaped plate.

4. The MPP ring stiffness tester according to claim 3, characterized in that: The tray (8) is provided with a plurality of supporting grooves (801) with different inner diameters along the axial direction, and a sliding groove (802) located at the bottom of the tray (8).

5. The MPP ring stiffness tester according to claim 4, characterized in that: The inner wall measurement component (9) comprises: Two sets of measuring pressure plates (91) are provided and symmetrically arranged on both sides of the chute (802); The slide rod (92) has an L-shaped structure, the horizontal end of the slide rod (92) is fixedly connected to the measuring pressure plate (91), and the vertical end of the slide rod (92) passes through the slide groove (802); A fixing seat (94) fixedly connected to the bottom of the tray (8); The adjusting screw (93) is threadedly connected to the fixing seat (94), and one end of the adjusting screw (93) is rotationally matched with the vertical end of the slide rod (92).

6. The MPP ring stiffness tester according to claim 5, characterized in that: Through slots (101) are provided at both ends of the frame (1).

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