Environmental stress testing equipment

Abstract

The present invention discloses an environmental stress testing device for testing plastic workpieces. The device comprises a fixed pile and a pair of pressure strip mechanisms. The side of the fixed pile is provided with a plurality of test slots. The plastic workpiece is placed in the test slots. The width of the plastic workpiece is the same as that of the test slots. The pair of pressure strip mechanisms press the two ends of the plastic workpiece into the test slots. The fixed pile is provided with an inner cavity. The inner cavity and the test slots are connected by a plurality of through holes. The through holes are provided with a cock. The cross section of the cock is the same as that of the through holes. The fixed pile is provided with a conduit. One end of the conduit is connected to the inner cavity, and the other end is connected to an external high-pressure gas source. When in use, the external gas source is turned on, and the high-pressure gas is discharged outward through the conduit, the inner cavity, the through holes, and the plastic workpiece in sequence. This can identify and determine whether cracks have appeared inside the plastic workpiece. The degree of influence of environmental stress on the plastic workpiece can be identified and determined without testing the mechanical properties of the plastic workpiece.

Description

Technical Field

[0001] The invention relates to environmental stress testing equipment, belonging to the technical field of detection and inspection. Background Art

[0002] Plastics degrade over time due to exposure to external forces, chemicals, wind, and sunlight, ultimately leading to damage to the plastic components and a significant decrease in their mechanical properties. A variety of environmental stress testing equipment for plastics is commercially available, which assesses the mechanical properties of plastics. However, when plastics degrade slightly, cracks may appear within the plastic. These cracks have a minimal impact on mechanical properties, and these environmental stress testing equipment cannot identify and determine whether cracks have occurred within the material. Therefore, determining whether cracks have occurred within plastics is a technical problem that urgently needs to be addressed by those skilled in the art. Summary of the Invention

[0003] In order to overcome the above shortcomings, the present invention aims to provide an environmental stress testing device to determine whether cracks occur inside the plastic.

[0004] In order to achieve the above purpose, the technical solution adopted by the present invention is: an environmental stress testing equipment for testing plastic workpieces, including a fixed pile and a pressure strip mechanism, a test groove is provided on the side of the fixed pile, the plastic workpiece is provided in the test groove, and the pressure strip mechanism presses the plastic workpiece in the test groove; an inner cavity is provided inside the fixed pile, and the inner cavity and the test groove are connected by a through hole, and a plug is provided in the through hole, and the cross-section of the plug is the same as the cross-section of the through hole; a conduit is provided on the fixed pile, one end of the conduit is connected to the inner cavity, and the other end is connected to an external high-pressure gas source.

[0005] In order to facilitate observation of whether high-pressure gas leaks out from the cracks of the plastic workpiece, the present invention is further configured such that: the high-pressure gas source is nitrogen. When nitrogen leaks out from the cracks of the plastic workpiece, the test result can be observed with the naked eye.

[0006] The present invention is further configured such that a sealing gasket is laid on the bottom of the test slot.

[0007] The present invention is further configured such that the cross section of the fixing pile is in the shape of an ellipsoid. As the curvature of the ellipsoidal surface gradually increases, the greater the curvature of the plastic workpiece, the larger the size of the crack, and the crack in the plastic workpiece is easier to detect.

[0008] The present invention is further configured such that the length of the test slot is greater than three quarters of the perimeter of the cross section of the fixing pile.

[0009] The present invention is further configured as follows: the pressure strip mechanism includes a pressure strip body, a pair of connecting rods and a pair of sliding rods, one end of the pair of connecting rods is respectively connected to one end of the pressure strip body, and the other end is respectively vertically connected to the middle of the pair of sliding rods; a sliding groove is respectively provided on both sides of the test groove, and a limiting groove is provided on the side wall of the sliding groove; a pair of connecting rods are respectively extended into the sliding groove, and the two ends of the sliding rod are respectively extended into the limiting groove.

[0010] By pushing the layering strip body, the connecting rod slides in the sliding groove, and the sliding rod slides in the limiting groove. The limiting groove prevents the sliding rod from falling off from the limiting groove, so that the layering strip body is attached to the surface of the fixed pile.

[0011] The present invention is further configured as follows: the cock includes a stopper bar and a plug body, the plug body is cylindrical, the side of the plug body is provided with an external thread, and the stopper bar is connected to the middle of the upper surface of the plug body; the inner wall of the through hole is provided with an internal thread matching the external thread.

[0012] To facilitate adjustment of the height of the fixing pile to suit the operator's preferences, the present invention further comprises: a central hole is provided in the middle of the fixing pile, and a partition wall is provided between the central hole and the inner cavity; the environmental stress testing equipment also includes a base, a central column, a lower nut, and an upper nut. The central column is vertically connected to the center of the base and inserted into the central hole. The central column is a stud, and the upper and lower nuts are screwed onto the central column. The upper and lower nuts respectively abut the upper and lower surfaces of the fixing pile. The height of the fixing pile can be changed by adjusting the position of the upper and lower nuts on the central column.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: an inner cavity is provided inside the fixed pile, a conduit is provided on the fixed pile, the inner cavity and the test slot are connected by a plurality of through holes, and a cock is provided in the through hole. When in use, some of the cocks are removed, and the plastic workpiece is filled in the test slot to cover the through hole. A pair of pressure strip mechanisms are used to press the two ends of the plastic workpiece. Afterwards, the external gas source is turned on, and the high-pressure gas is discharged outward through the conduit, the inner cavity, the through hole and the plastic workpiece in turn, so that it can be identified and judged that cracks have appeared inside the plastic workpiece. The present invention can identify and judge the degree to which the plastic workpiece is affected by environmental stress without testing the mechanical properties of the plastic workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the three-dimensional structure of the environmental stress testing equipment;

[0015] Figure 2 A schematic diagram of the three-dimensional structure of the environmental stress test equipment from another perspective;

[0016] Figure 3 It is a schematic diagram of the cross-sectional structure of the environmental stress test equipment;

[0017] Figure 4 for Figure 1 Schematic diagram of the structure of the middle layering mechanism;

[0018] Figure 5 for Figure 3 The structure diagram of the partial enlargement of the middle circle A;

[0019] Figure 6 for Figure 2 Schematic diagram of the structure of the middle plug;

[0020] Figure 7 A top view of the environmental stress test equipment.

[0021] In the figure: 1. Fixed pile; 2. Base; 3. Test slot; 4. Upper nut; 5. Center column; 6. Lower nut; 7. Conduit; 8. Pressure strip mechanism; 9. Inner cavity; 10. Isolation wall; 31. Plug; 32. Sealing gasket; 33. Slide groove; 34. Limiting groove; 35. Through hole; 81. Pressure strip body; 82. Connecting rod; 83. Slide rod; 311. Stop bar; 312. Plug body; 313. External thread. DETAILED DESCRIPTION

[0022] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more precise definition of the protection scope of the present invention.

[0023] See attached Figure 1-7 As shown, an environmental stress testing device in this embodiment is used to test plastic workpieces, comprising a fixed pile 1 and a pressure strip mechanism 8. The fixed pile 1 is provided with a plurality of test slots 3 on its side, and the plastic workpiece is placed in the test slots 3. The fixed pile 1 is provided with an inner cavity 9, which is connected to the test slots 3 by a plurality of through holes 35. The through holes 35 are provided with a plug 31, and the cross section of the plug 31 is the same as that of the through holes 35. The fixed pile 1 is provided with a conduit 7, one end of which is connected to the inner cavity 9 and the other end is connected to an external high-pressure gas source. The pressure strip mechanism 8 includes a pressure strip body 81, a pair of connecting rods 82, and a pair of sliding rods 83. One end of the pair of connecting rods 82 is respectively connected to one end of the pressure strip body 81, and the other end is respectively connected vertically to the middle of the pair of sliding rods 83. A slide 33 is provided on each side of the test slot 3, and a limit slot 34 is provided on the side wall of the slide 33. The pair of connecting rods 82 respectively extend into the slide 33, and the ends of the sliding rod 83 respectively extend into the limit slot 34. The width of the plastic workpiece is equal to or smaller than the width of the test slot 3, as long as the plastic workpiece can cover the through hole 35. Preferably, the width of the plastic workpiece is the same as the width of the test slot 3.

[0024] The high pressure gas source is nitrogen. When nitrogen overflows from the gaps of the plastic workpiece, the test results can be observed with the naked eye. A sealing gasket 32 ​​is laid at the bottom of the test tank 3.

[0025] The cross section of the fixing pile 1 is elliptical in shape. The length of the test slot 3 is greater than three quarters of the circumference of the cross section of the fixing pile.

[0026] The stopper 31 includes a stopper bar 311 and a plug body 312 . The plug body 312 is cylindrical in shape. An external thread 313 is provided on the side of the plug body 312 . The stopper bar 311 is connected to the middle of the upper surface of the plug body 312 . The inner wall of the through hole 35 is provided with an internal thread matching the external thread 313 .

[0027] A center hole is provided in the middle of the fixing pile 1, and an isolation wall 10 is provided between the center hole and the inner cavity 9; the environmental stress testing equipment also includes a base 2, a center column 5, a lower nut 6 and an upper nut 4, the center column 5 is vertically connected to the center of the base 2, the center column 5 is inserted into the center hole, the center column 5 is a stud, the upper nut 4 and the lower nut 6 are screwed on the center column 5, and the upper nut 4 and the lower nut 6 are respectively abutted against the upper surface and lower surface of the fixing pile 1.

[0028] In summary, the principle of the environmental stress testing equipment shown in the present invention is as follows: an inner cavity 9 is provided inside the fixed pile 1, a conduit 7 is provided on the fixed pile 1, and the inner cavity 9 is connected to the test slot 3 through a plurality of through holes 35, and a plug 31 is provided in the through hole 35. When in use, part of the plug 31 is removed, and the plastic workpiece is filled in the test slot 3 to cover the through hole 35. A pair of pressure strip mechanisms 8 are used to press the two ends of the plastic workpiece. The connecting rod 82 and the sliding rod 83 slide according to the length of the plastic workpiece, and it is appropriate to press the two ends of the plastic workpiece with the pressure strip body. Afterwards, the external air source is turned on, and the high-pressure gas is discharged outward through the conduit 7, the inner cavity 9, the through hole 35 and the plastic workpiece in turn. It can be detected by the operator's hand skin induction or by spraying soapy water on the surface of the plastic workpiece to determine whether there are cracks inside the plastic workpiece.

[0029] As the curvature of the elliptical surface gradually increases, the greater the curvature of the plastic workpiece, the larger the size of the crack, and the easier it is to detect and find the crack in the plastic workpiece. Generally, the length of the plastic workpiece is less than or equal to the length of the test slot 3, and the width of the plastic workpiece is equal to the width of the test slot 3. By pushing the pressure strip body 81, the connecting rod 82 slides in the slide groove 33, and the slide rod 83 slides in the limit groove 34. The limit groove 34 prevents the slide rod 83 from falling out of the limit groove 34, so that the pressure strip body 81 is attached to the surface of the fixed pile. In order to facilitate the adjustment of the height position of the fixed pile 1 to suit the operator's habits, the height of the fixed pile 1 is changed by adjusting the position of the upper nut and the lower nut 6 on the center column 5.

[0030] The present invention can identify and judge the degree of influence of environmental stress on a plastic workpiece without testing the mechanical properties of the plastic workpiece, and can draw a conclusion by observing the amount of high-pressure gas escaping from the gaps in the plastic workpiece.

[0031] The above embodiments are only for illustrating the technical concept and features of the present invention. Its purpose is to enable people familiar with this technology to understand the content of the present invention and implement it. It cannot be used to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. An environmental stress testing device for testing plastic workpieces, comprising a fixing pile and a pressure strip mechanism, wherein a test slot is provided on the side of the fixing pile, the plastic workpiece is placed in the test slot, and the pressure strip mechanism presses the plastic workpiece tightly in the test slot; characterized in that: The fixing pile is provided with an inner cavity, the inner cavity is connected to the test slot via a through hole, a cock is provided in the through hole, and the cross section of the cock is the same as the cross section of the through hole; a conduit is provided on the fixing pile, one end of the conduit is connected to the inner cavity, and the other end is connected to an external high-pressure gas source; The high-pressure gas source is nitrogen; A sealing gasket is laid on the bottom of the test slot; The cross section of the fixing pile is in the shape of an ellipsoid; The length of the test slot is greater than three quarters of the cross-sectional perimeter of the fixing pile; The pressure bar mechanism includes a pressure bar body, a pair of connecting rods and a pair of sliding rods, one end of the pair of connecting rods is respectively connected to one end of the pressure bar body, and the other end is respectively vertically connected to the middle of the pair of sliding rods; a sliding groove is respectively provided on both sides of the test groove, and a limiting groove is provided on the side wall of the sliding groove; a pair of connecting rods are respectively extended into the sliding groove, and the two ends of the sliding rod are respectively extended into the limiting groove.

2. The environmental stress testing device according to claim 1, characterized in that: The plug includes a stopper bar and a plug body. The plug body is cylindrical in shape. The side of the plug body is provided with an external thread. The stopper bar is connected to the middle of the upper surface of the plug body. The inner wall of the through hole is provided with an internal thread matching the external thread.

3. The environmental stress testing device according to claim 2, characterized in that: A center hole is provided in the middle of the fixing pile, and an isolation wall is provided between the center hole and the inner cavity; the environmental stress testing equipment also includes a base, a center column, a lower nut and an upper nut, the center column is vertically connected to the center of the base, the center column is inserted into the center hole, the center column is a stud, the upper nut and the lower nut are screwed on the center column, and the upper nut and the lower nut are respectively abutted against the upper surface and lower surface of the fixing pile.

Images