Bending fatigue tester for building protective film

Abstract

The utility model discloses a bending fatigue tester for a building protective film. The bending fatigue tester comprises a base, and a bending mechanism, a transmission mechanism and a driving mechanism which are arranged on the base, the bending mechanism comprises a pair of long-strip-shaped clamping plates capable of swinging up and down in a reciprocating mode, the center positions of the clamping plates are rotationally connected with rotating shafts, and the rotating shafts are installed on the side faces of the base respectively. The transmission mechanism comprises a main shaft, two cranks installed at the two ends of the main shaft respectively and two connecting rods connected with the cranks respectively, the upper ends of the connecting rods are connected to the eccentric positions of the clamping plates respectively, and the cranks, the connecting rods and the clamping plates which are connected mutually form two crank rocker mechanisms respectively. The bending fatigue testing device is used for carrying out bending fatigue testing on the building protective film and determining whether various performance indexes of a building protective film product still meet requirements or not after the building protective film product is bent, twisted and deformed along with a metal roof.

Description

Technical Field

[0001] This utility model relates to a fatigue testing instrument, and more particularly to a fatigue testing device for testing building protective membranes. Background Technology

[0002] Building protective film is a thin film material that is applied to metal roofs. Nowadays, many industrial parks and factories use metal roofs. The anti-corrosion coatings on the metal surface are not durable enough. Over time, the metal surface is prone to corrosion and water seepage. Therefore, a layer of building protective film is applied to the metal roof to provide waterproof and anti-corrosion protection.

[0003] To simulate the process of a metal roof being blown up and down repeatedly by strong winds in severe weather, a bending fatigue tester is needed to conduct bending tests on the building protective membrane product. This utility model provides a bending fatigue tester specifically designed to determine whether the various performance indicators of the building protective membrane product still meet the requirements after bending and twisting deformation with the metal roof. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a bending fatigue tester for measuring the bending resistance of building protective films.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A bending fatigue tester for building protective membranes includes a base and a bending mechanism, a transmission mechanism and a drive mechanism disposed on the base.

[0007] The bending mechanism includes a pair of long strip-shaped clamps that can swing back and forth. The center of the clamps is rotatably connected to a rotating shaft, which is respectively installed on the side of the base.

[0008] The transmission mechanism includes a main shaft, two sets of cranks respectively installed at both ends of the main shaft, and two sets of connecting rods respectively connected to the cranks. The upper ends of the connecting rods are respectively connected to the eccentric position of the clamping plate. The cranks, connecting rods and clamping plate connected to each other constitute two sets of crank-rocker mechanisms.

[0009] The clamping plate is mainly composed of angle steel and scraper clamp connected by screws to form an L-shaped whole. The scraper clamp is mainly composed of upper clamping plate and lower clamping plate connected by adjusting screws. The upper part of the lower clamping plate is fixed to the angle steel by the screws. The upper clamping plate is connected to the lower part of the lower clamping plate by adjusting screws. The two together form a slot for clamping materials.

[0010] The crank is provided with a main rotation axis and a driven rotation axis. The main rotation axis is connected to the ends of the main shaft at both ends, and the driven rotation axis is rotatably connected to the lower end of the connecting rod on the same side. The driven rotation axes of the two cranks are installed in opposite directions.

[0011] By adopting the above technical solution, this utility model has the following advantages compared with the prior art:

[0012] This invention is applicable to the bending fatigue test of building protective film, and determines whether the performance indicators of the building protective film product still meet the requirements after bending and twisting deformation with the metal roof. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 for Figure 1 Enlarged view at point A; Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0016] Example

[0017] like Figure 1 The schematic diagram shown illustrates that this utility model includes a base 1 and a bending mechanism, a transmission mechanism, and a drive mechanism disposed on the base 1.

[0018] The base 1 is formed by connecting a base plate 11 and multiple side plates 12 to create an internal space for housing the transmission mechanism and the drive mechanism. The upper half of the left and right side plates 12 is used to connect the bending mechanism respectively.

[0019] The bending mechanism includes two long, narrow clamps 2 that can swing back and forth, see Figure 2 The clamping plate 2 structure shown is mainly composed of angle steel 21 and scraper clamp 22 connected together by screws 23. The scraper clamp 22 is mainly composed of upper clamping plate 221 and lower clamping plate 222 connected by adjusting screws 223. The upper part of the lower clamping plate 222 is used to fix it to the angle steel 21 by screws 23. The inner side of the lower part of the lower clamping plate 222 and the inner side of the upper clamping plate 221 form a corrugated shape. The upper clamping plate 221 is connected to the lower part of the lower clamping plate 222 by adjusting screws 223. The two together form a slot for clamping materials. The adjusting screws 223 are used to adjust the clamping degree.

[0020] The lower clamping plate 222 of the scraper clamp 22 is connected to the horizontal side of the angle steel 21 by screws 23, so that the angle steel 21 and the scraper clamp 22 together form an L-shaped clamping plate 2.

[0021] See Figure 1 The base 1 has a rotating shaft 3 on the upper half of the left and right side plates 12 respectively. The ends of the rotating shaft 3 are connected to the middle of the L-shaped vertical edge of the clamp plate 2, so that the clamp plate 2 can swing freely.

[0022] The L-shaped vertical edge of the clamping plate 2 is also rotatably connected to the transmission mechanism. The transmission mechanism includes a main shaft 41, two sets of cranks 42 respectively installed at both ends of the main shaft 41, and two sets of connecting rods 43 respectively connected to the cranks 42. The upper ends of the connecting rods 43 are respectively connected to the eccentric position of the clamping plate 2. The connected cranks 42, connecting rods 43 and clamping plate 2 respectively constitute two sets of crank-rocker mechanisms.

[0023] The main shaft 41 is horizontally arranged inside the base 1 and is set through bearings on multiple vertical partitions 13 inside the base 1. The crank 42 is provided with two rotating shafts, namely the main rotating shaft and the driven rotating shaft. The main rotating shaft of the crank 42 is connected to the ends of the main shaft 41 at both ends. The driven rotating shaft of the crank 42 is rotatably connected to the lower end of the connecting rod 43. The upper end of the connecting rod 43 is rotatably connected to the non-middle position of the L-shaped vertical edge of the clamping plate 2.

[0024] This invention utilizes the working principle of a crank-rocker mechanism. When the crank 42 rotates around the main shaft 41, it drives the lower end of the connecting rod 43 to move. The connecting rod 43 converts the rotational motion of the crank 42 into the vertical linear motion of one end of the clamping plate 2, thereby causing the clamping plate 2 to swing back and forth. The orientations of the rotation axes of the two cranks 42 are exactly opposite. When the crank 42 rotates to the vertical position, the rotation axis of one crank 42 connected to the connecting rod 43 is at the highest point, and the connecting rod 43 also drives one end of the clamping plate 2 on the same side to rise to the highest point. At the same time, the rotation axis of the other crank 42 connected to the connecting rod 43 on the same side is at the lowest point, and the connecting rod 43 also drives one end of the clamping plate 2 on the same side to fall to the lowest point. Thus, during the continuous rotation of the main shaft 41, the two clamping plates 2 on the left and right sides swing up and down continuously, and the swing directions of the two clamping plates 2 are exactly opposite.

[0025] The main shaft 41 rotates under the drive of the drive mechanism, which consists of a motor 51 and a gearbox 52. The main shaft 41 is connected to the output end of the gearbox 52.

[0026] When using this invention to conduct bending fatigue tests, a piece of sheet metal with a layer of building protective film attached to its surface is clamped between two clamping plates 2. The clamping is tightened by adjusting screws 223. The motor 51 is started. Under the swing of the two clamping plates 2, the sheet metal is continuously twisted and bent, simulating the process of a metal roof being blown by a strong wind. During the test, it can be observed whether the building protective film can still maintain its adhesion under continuous bending.

[0027] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A bending fatigue testing instrument for building protective membranes, characterized in that: Includes a base and a bending mechanism, a transmission mechanism and a drive mechanism disposed on the base; The bending mechanism includes a pair of long strip-shaped clamps that can swing back and forth. The center of the clamps is rotatably connected to a rotating shaft, which is respectively installed on the side of the base. The transmission mechanism includes a main shaft, two sets of cranks respectively installed at both ends of the main shaft, and two sets of connecting rods respectively connected to the cranks. The upper ends of the connecting rods are respectively connected to the eccentric position of the clamping plate. The cranks, connecting rods and clamping plate connected to each other constitute two sets of crank-rocker mechanisms.

2. The bending fatigue testing instrument for building protective membrane as described in claim 1, characterized in that: The clamping plate is mainly composed of angle steel and scraper clamp connected by screws to form an L-shaped whole. The scraper clamp is mainly composed of upper clamping plate and lower clamping plate connected by adjusting screws. The upper part of the lower clamping plate is fixed to the angle steel by the screws. The upper clamping plate is connected to the lower part of the lower clamping plate by adjusting screws. The two together form a slot for clamping materials.

3. The bending fatigue testing instrument for building protective membrane as described in claim 2, characterized in that: The crank is provided with a main rotation axis and a driven rotation axis. The main rotation axis is connected to the ends of the main shaft at both ends, and the driven rotation axis is rotatably connected to the lower end of the connecting rod on the same side. The driven rotation axes of the two cranks are installed in opposite directions.

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