Plastic impact sample clamp for laboratory light source exposure test

Abstract

The utility model discloses a plastic impact sample clamp for a laboratory light source exposure test, which comprises a main clamp frame, a rear fixing frame and a positioning strip, an exposure window is arranged on the main clamp frame, flanges are respectively arranged on the left side and the right side of the back of the main clamp frame, and an accommodating groove is formed between the inner side surfaces of the flanges and the back of the main clamp frame. Positioning strips are respectively mounted in the accommodating grooves in the left side and the right side, at least one bayonet is formed in each positioning strip, two ends of the plastic impact sample are respectively clamped in the bayonets of the positioning strips on the two sides during testing, and the rear fixing frame is clamped behind the main clamping frame and is pressed on the positioning strips or the plastic impact sample. According to the utility model, a plurality of plastic impact samples can be more conveniently mounted.

Description

Technical Field

[0001] The utility model relates to the field of climate aging tests of plastics, and particularly relates to a sample clamp for plastic impact specimens used in laboratory light source exposure tests. Background Art

[0002] Laboratory light source exposure test is a common method for plastic climate aging tests, including xenon lamp exposure test, fluorescent ultraviolet lamp exposure test, solar radiation simulation test, etc. Before and after the test, the performance changes of plastics usually need to be investigated, such as appearance changes like color, gloss, cracking, powdering, deformation, etc., and mechanical property changes such as tensile, bending, and impact. In the light source exposure test, the plastic specimen must be fixed on the sample rack of the test equipment for the test, and the installation method of the specimen is an issue that must be considered in the test.

[0003] Currently, the widely used specimen installation method in the laboratory is: using the universal sample clamp provided by the manufacturer of the light source exposure test equipment, fixing the specimen on the universal sample clamp, and then installing the universal sample clamp on the sample rack of the test equipment. As Figure 24 and Figure 25 shown, one of the universal sample clamps for a fluorescent ultraviolet lamp exposure device is composed of two parts, namely the main frame 17 and the fixing ring 19. The main frame 17 has two rectangular openings 18 for exposing the specimen, and the fixing ring 19 has elasticity for fixing the specimen.

[0004] The scheme of using the universal sample clamp provided by the manufacturer of the light source exposure test equipment to fix the specimen is more suitable for rectangular flat specimens 16, and such specimens are mainly used to investigate appearance changes. However, for the case of investigating mechanical properties, due to the strict regulations on the shape and size of the specimen in the mechanical property test method standard, the specimen is not applicable to the universal sample clamp provided by the manufacturer in terms of size or fixing method.

[0005] In the case of investigating the change of mechanical properties of plastics after aging, one of the specimens involved is the plastic impact specimen 3. The plastic impact specimen 3 generally undergoes an aging test in a light source exposure test equipment. After the specified exposure time, it is taken out for a mechanical impact test. As Figures 20 to 23 shown, the plastic impact specimen 3 needs to be made into a strip shape according to the standard and has standard dimensions. Such a plastic impact specimen 3 cannot be well fixed in the above-mentioned universal sample clamp, especially when it is necessary to irradiate the notch surface of the plastic impact specimen or when it is necessary to install the plastic impact specimen at intervals, which is very inconvenient and often requires fixing methods such as tying, time-consuming and non-standard. Content of the Utility Model

[0006] The purpose of the utility model is to provide a sample clamp for plastic impact specimens used in laboratory light source exposure tests, which can more conveniently install multiple plastic impact specimens.

[0007] The object of the present utility model is achieved by the following technical solutions:

[0008] A plastic impact specimen sample clamp for laboratory light source exposure test, characterized in that: it includes a main clamp frame, a rear fixing frame and a positioning strip. An exposure window is provided on the main clamp frame. On the left and right sides of the back of the main clamp frame, there are respectively provided retaining edges. The inner side surface of the retaining edge and the back of the main clamp frame form a receiving groove. In the receiving grooves on the left and right sides, positioning strips are respectively installed. At least one bayonet is provided on the positioning strip. During the test, both ends of the plastic impact specimen will be respectively stuck in the bayonets of the positioning strips on both sides. The rear fixing frame is clamped behind the main clamp frame, and the rear fixing frame presses on the positioning strip or the plastic impact specimen.

[0009] Further, the positioning strip is provided with bent edges for abutting against the plastic impact specimen, and a bayonet is formed between the two bent edges.

[0010] Further, at both ends of the retaining edge, there are respectively provided limiting edges formed by bending inwards. Card holes are provided on the limiting edges. At both ends of the positioning strip, there are respectively provided protruding buckles, and the buckles are inserted into the card holes in a matching manner.

[0011] Further, there is a distance between the bayonets on the positioning strip, so that there is a gap between adjacent two plastic impact specimens during the test.

[0012] Further, clip pieces are respectively provided at both ends of the retaining edge. The clip pieces are used to press on the back of the rear fixing frame, so that the rear fixing frame is clamped between the clip pieces and the positioning strip or the plastic impact specimen.

[0013] Further, the clip piece includes a high clip piece and a low clip piece. The high clip piece and the low clip piece are respectively arranged side by side at both ends of the retaining edge. The distance between the high clip piece and the main clamp frame is greater than the distance between the low clip piece and the main clamp frame; when the plastic impact specimen is horizontally placed and installed in the sample clamp, the rear fixing frame is clamped between the low clip piece and the positioning strip or the plastic impact specimen, and when the plastic impact specimen is erected and installed in the sample clamp, the rear fixing frame is clamped between the high clip piece and the positioning strip or the plastic impact specimen.

[0014] Further, the clip piece is provided with a protrusion for pressing on the rear fixing frame.

[0015] Further, the exposure window is rectangular.

[0016] Further, the rear fixing frame is provided with air vents.

[0017] Compared with the prior art, the present utility model has the following beneficial effects:

[0018] 1. The sample clamp of the utility model clamps the two ends of the plastic impact specimen by means of the bayonet of the positioning strips arranged on both sides of the main clamp frame, and presses it through the rear fixing frame, so that multiple plastic impact specimens can be installed side by side, which is convenient, quick, more standardized and has good consistency after installation.

[0019] 2. The sample holder of the utility model has a simple structure and can be made relatively compact as a whole, and can be adapted to be installed in the universal sample holder of the existing mainstream light source exposure test equipment. When used in a light source exposure test equipment in which the sample is horizontally installed at the bottom of the test space for testing, the sample holder of the utility model does not need to be installed in the universal sample holder, and can be directly installed horizontally in the light source exposure test equipment for use.

[0020] The utility model can also be directly installed on an exposure rack for outdoor exposure tests.

[0021] 3. When the plastic impact specimen is mounted on the sample clamp of the utility model, the sample clamp will not exert external stress on the plastic impact specimen, which meets the basic requirements of the light source exposure test standard for sample installation.

[0022] 4. The plastic impact specimen is installed obliquely in the sample holder of the utility model, and the entire sample holder containing the plastic impact specimen is then installed vertically or obliquely on the sample holder of the light source exposure test equipment. In the test with spraying or condensation, the plastic impact specimen will not accumulate water droplets. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the main view of the sample clamp of the utility model when a plastic impact specimen is clamped therein;

[0024] Figure 2 It is a side view schematic diagram of the sample clamp of the utility model when a plastic impact specimen is clamped therein;

[0025] Figure 3 It is a top view schematic diagram of the sample clamp of the utility model when a plastic impact specimen is clamped therein;

[0026] Figure 4 This is a partial cross-sectional view of the sample clamp of the utility model when the plastic impact specimen is clamped, and the section position is Figure 2 AA position in;

[0027] Figure 5 yes Figure 4 A schematic cross-sectional view of the middle BB;

[0028] Figure 6 yes Figure 4 The enlarged schematic diagram of the center C;

[0029] Figure 7It is a schematic structural view of the rear fixing frame of the sample clamp of the present utility model;

[0030] Figure 8 It is a rear view schematic diagram when the plastic impact specimen is vertically clamped and installed in the sample clamp of the present utility model, and the rear fixing frame is hidden, and there is a gap between the plastic impact specimens;

[0031] Figure 9 It is a rear view schematic diagram when the plastic impact specimen is vertically clamped and installed in the sample clamp of the present utility model, and the rear fixing frame is hidden, and there is no gap between the plastic impact specimens;

[0032] Figure 10 It is a rear view schematic diagram when the plastic impact specimen is horizontally clamped and installed in the sample clamp of the present utility model, and the rear fixing frame is hidden, and there is a gap between the plastic impact specimens;

[0033] Figure 11 It is a rear view schematic diagram when the plastic impact specimen is horizontally clamped and installed in the sample clamp of the present utility model, and the rear fixing frame is hidden, and there is no gap between the plastic impact specimens;

[0034] Figure 12 It is a front view schematic diagram of the positioning strip of the first structure adopted by the present utility model;

[0035] Figure 13 It is a side view schematic diagram of the positioning strip of the first structure adopted by the present utility model;

[0036] Figure 14 It is a front view schematic diagram of the positioning strip of the second structure adopted by the present utility model;

[0037] Figure 15 It is a side view schematic diagram of the positioning strip of the second structure adopted by the present utility model;

[0038] Figure 16 It is a front view schematic diagram of the positioning strip of the third structure adopted by the present utility model;

[0039] Figure 17 It is a side view schematic diagram of the positioning strip of the third structure adopted by the present utility model;

[0040] Figure 18 It is a front view schematic diagram of the positioning strip of the fourth structure adopted by the present utility model;

[0041] Figure 19 It is a side view schematic diagram of the positioning strip of the fourth structure adopted by the present utility model;

[0042] Figure 20 It is a front view schematic diagram of a strip-shaped plastic impact specimen made according to the standard;

[0043] Figure 21 It is a top view schematic diagram of a strip-shaped plastic impact specimen made according to the standard;

[0044] Figure 22 It is a front view schematic diagram of a strip-shaped plastic impact specimen with a notch in the middle made according to the standard;

[0045] Figure 23 It is a top view schematic diagram of a strip-shaped plastic impact specimen with a notch in the middle made according to the standard;

[0046] Figure 24 It is a rear view schematic diagram of a general sample clip for a fluorescent ultraviolet lamp exposure device;

[0047] Figure 25 It is a side view schematic diagram of a general sample clip for a fluorescent ultraviolet lamp exposure device.

[0048] Meanings of the reference numerals in the figure:

[0049] 1 - main clip frame; 2 - exposure window; 3 - plastic impact specimen; 4 - edge stop; 5 - short clip piece; 6 - tall clip piece; 7 - protrusion; 8 - limit edge; 9 - buckle; 10 - card hole; 11 - rear fixing frame; 12 - positioning strip; 13 - bayonet; 14 - bent edge; 15 - air vent; 16 - rectangular flat specimen; 17 - main frame; 18 - rectangular opening; 19 - fixing ring; 20 - receiving groove. Detailed implementation manners

[0050] The following further describes the present utility model in combination with embodiments.

[0051] In the description of the present utility model, it should be understood that for the orientation description, such as the orientation or positional relationship indicated by up, down, front, rear, left, right, etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0052] In the description of the present utility model, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, exceeding, etc. are understood as not including the present number, and above, below, within, etc. are understood as including the present number. If the first and second are described only for the purpose of distinguishing technical features, they should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0053] In the description of the present utility model, unless otherwise clearly defined, terms such as "set", "installed", "connected", etc. should be understood in a broad sense, and those skilled in the relevant technical field can reasonably determine the specific meanings of the above terms in the present utility model in combination with the specific content of the technical solution.

[0054] Embodiment:

[0055] As shown in Figures 1 to Figure 19 Shown in the figure is a plastic impact specimen sample clamp for laboratory light source exposure test according to this embodiment, which includes a main clamp frame 1, a rear fixing frame 11 and a positioning strip 12. The main clamp frame 1, the rear fixing frame 11 and the positioning strip 12 are all made of stainless steel material.

[0056] An exposure window 2 is provided on the main clamp frame 1. The exposure window 2 is rectangular, and during the test, the light source can irradiate the plastic impact specimen 3 through the exposure window 2. In this embodiment, a ventilation opening 15 is provided on the rear fixing frame 11, and the opening of the ventilation opening 15 is beneficial to maintaining air circulation during the test. In another embodiment, according to some test standards, when a back lining is required for the specimen, in this case, the rear fixing frame 11 can be directly replaced with a rectangular plate without openings.

[0057] On the left and right sides of the back of the main clamp frame 1, there are respectively provided retaining edges 4. The retaining edges 4 are bent vertically towards the back of the main clamp frame 1. At both ends of the retaining edges 4, there are respectively provided limiting edges 8 formed by vertically bending inwards. The limiting edges 8 are perpendicular to the main clamp frame 1, and there are two side-by-side clamping holes 10 on the limiting edges 8.

[0058] Clamping pieces are respectively provided at both ends of the retaining edges 4. The clamping pieces in this embodiment include a high clamping piece 6 and a low clamping piece 5. Both the high clamping piece 6 and the low clamping piece 5 are parallel to the main clamp frame 1. Among them, the distance between the high clamping piece 6 and the main clamp frame 1 is greater than the distance between the low clamping piece 5 and the main clamp frame 1.

[0059] As shown in Figure 3 the figure, in this embodiment, protrusions 7 are respectively provided on the high clamping piece 6 and the low clamping piece 5. The protrusions 7 are formed by punching with a punch on the high clamping piece 6 and the low clamping piece 5. The protrusions 7 are used to press on the rear fixing frame 11, so as to make the fixation of the rear fixing frame 11 more stable.

[0060] The inner side surface of the retaining edge 4 and the back surface of the main clamp frame 1 form a receiving groove 20. Positioning strips 12 are respectively installed in the receiving grooves 20 on the left and right sides. The left and right positioning strips 12 form a set for cooperative use. A bent edge 14 is formed by bending on the positioning strip 12, and a clamping opening 13 is formed between the two bent edges 14. In this embodiment, at least one clamping opening 13 is provided on the positioning strip 12.

[0061] More than one type of positioning strip 12 can be provided for the sample clamp to meet different test requirements. As shown in Figures 12 to 19 the figure, this embodiment is provided with four types of positioning strips:

[0062] Figure 12 and Figure 13 The positioning strip 12 of the first structure shown has a plurality of bayonets 13, and there is a distance between the bayonets 13, so that there is a gap between two adjacent plastic impact specimens 3 during the test. Figure 14 and Figure 15 The positioning strip 12 of the second structure shown has a relatively large bayonet 13, and there will be no gap between the plastic impact specimens 3 during the test. Figure 16 and Figure 17 The positioning strip 12 of the third structure shown has a plurality of bayonets 13. The bayonets 13 on the positioning strip 12 of the third structure are larger than the bayonets 13 on the positioning strip 12 of the first structure, and are used to hold the horizontally placed plastic impact specimen 3. Figure 18 and Figure 19 The positioning strip 12 of the fourth structure shown has a relatively large bayonet 13. The bayonets 13 on the positioning strip 12 of the fourth structure are larger than the bayonets 13 on the positioning strip 12 of the second structure, and are used to hold the horizontally placed plastic impact specimen 3.

[0063] The positioning strips 12 are used in pairs. The two positioning strips 12 in the same group adopt the same structure, but the positioning strip 12 on the left side in the main clamping frame 1 is rotated 180° relative to the positioning strip 12 on the right side. Moreover, the position of the bayonet 13 in this embodiment is biased towards one end of the positioning strip 12, so that during the test, the plastic impact specimen 3 installed in the sample clamp is inclined.

[0064] As Figure 6 shown, both ends of the positioning strip 12 are bent inwardly and are provided with protruding buckles 9. During use, the end of the positioning strip 12 will abut against the limiting edge 8, and the buckle 9 is inserted into the card hole 10 to complete the clamping connection.

[0065] This embodiment has the following four installation methods for the plastic impact specimen 3:

[0066] 1. As Figure 8 shown, it is the first installation method. The plastic impact specimen 3 is installed upright in the sample clamp, and there is a gap between two adjacent plastic impact specimens 3. Installing upright means that the plastic impact specimen 3 is perpendicular to the main clamping frame 1.

[0067] Positioning strips 12 are respectively installed in the receiving grooves 20 on the left and right sides. This installation method adopts the positioning strip 12 of the first structure as shown in Figure 12 and Figure 13 shown. The two ends of the plastic impact specimen 3 are respectively clamped in the bayonets 13 of the positioning strips 12 on the left and right sides. The positioning strip 12 on the left side is rotated 180° relative to the positioning strip 12 on the right side, so that the installed plastic impact specimen 3 is inclined.

[0068] 2. As shown in Figure 9 Figure 2, the second installation method is that the plastic impact specimens 3 are installed upright in the sample clamp, but there is no gap between two adjacent plastic impact specimens 3, and they are in contact with each other.

[0069] Positioning bars 12 are respectively installed in the receiving grooves 20 on the left and right sides. This installation method uses the positioning bars 12 of the second structure as shown in Figure 14 and Figure 15 Figure 3. The two ends of the plastic impact specimen 3 are respectively stuck in the bayonets 13 of the positioning bars 12 on the left and right sides. The left positioning bar 12 is rotated 180° relative to the right positioning bar 12, so that the installed plastic impact specimen 3 is inclined.

[0070] 3. As shown in Figure 10 Figure 4, the third installation method is that the plastic impact specimens 3 are installed flat in the sample clamp, and there is a gap between two adjacent plastic impact specimens 3. Installing flat means that the plastic impact specimen 3 is parallel to the main clamp frame 1, and the two ends of the front or back surface of the plastic impact specimen 3 are flat against the back surface of the main clamp frame 1.

[0071] Positioning bars 12 are respectively installed in the receiving grooves 20 on the left and right sides. This installation method uses the positioning bars 12 of the third structure as shown in Figure 16 and Figure 17 Figure 5. The two ends of the plastic impact specimen 3 are respectively stuck in the bayonets 13 of the positioning bars 12 on the left and right sides. The left positioning bar 12 is rotated 180° relative to the right positioning bar 12, so that the installed plastic impact specimen 3 is inclined.

[0072] Since the area occupied by the plastic impact specimen 3 when installed flat is larger than the area occupied by the plastic impact specimen 3 when installed upright on the main clamp frame 1, therefore, the bayonet 13 of the positioning bar 12 used in the third installation method is larger than the bayonet 13 of the positioning bar 12 used in the first installation method.

[0073] 4. As shown in Figure 11 Figure 6, the fourth installation method is that the plastic impact specimens 3 are installed flat in the sample clamp, but there is no gap between two adjacent plastic impact specimens 3, and they are in contact with each other.

[0074] Positioning bars 12 are respectively installed in the receiving grooves 20 on the left and right sides. This installation method uses the positioning bars 12 of the third structure as shown in Figure 18 and Figure 19 Figure 5. The two ends of the plastic impact specimen 3 are respectively stuck in the bayonets 13 of the positioning bars 12 on the left and right sides. The left positioning bar 12 is rotated 180° relative to the right positioning bar 12, so that the installed plastic impact specimen 3 is inclined.

[0075] Since the area occupied by the plastic impact specimen 3 when placed horizontally on the main clamping frame 1 is larger than that when placed vertically, the bayonet 13 of the positioning bar 12 used in the fourth installation method is larger than the bayonet 13 of the positioning bar 12 used in the second installation method.

[0076] After the plastic impact specimen 3 is installed in the main clamping frame by the above installation method, the rear fixing frame 11 can be clamped behind the main clamping frame 1, thereby fixing the plastic impact specimen 3. As Figure 3 shown, when the plastic impact specimen 3 is installed vertically in the sample clamp, the rear fixing frame 11 is clamped between the upper clamping piece 6 and the plastic impact specimen 3. When the plastic impact specimen 3 is installed horizontally in the sample clamp, the rear fixing frame 11 will be clamped between the lower clamping piece 5 and the positioning bar or the plastic impact specimen 3.

[0077] During the test, after clamping multiple plastic impact specimens 3 with the sample clamp of this embodiment, the sample clamp with the plastic impact specimens 3 is integrally installed in the general sample clamp of the existing mainstream light source exposure test equipment, and then installed in the light source exposure test equipment to conduct the test, such as the mainstream xenon lamp exposure test equipment and fluorescent ultraviolet lamp exposure test equipment. When using a light source exposure test equipment in which the specimen is installed horizontally at the bottom of the test space for testing, the sample clamp does not need to be installed in the general sample clamp again and can be directly installed horizontally in the light source exposure test equipment for use.

[0078] The plastic impact specimens 3 applicable to the sample clamp of this embodiment include type 1 specimens specified in GB / T 1043.1 and ISO 179-1, and specimens specified in GB / T 1843 and ISO 180. The plastic impact specimen 3 can have a notch or not.

[0079] The above embodiments of the present invention do not limit the protection scope of the present invention. The implementation manners of the present invention are not limited thereto. All kinds of modifications, substitutions or changes made to the above structure of the present invention according to the above content of the present invention, in accordance with the common general knowledge and conventional means in the art, without departing from the above basic technical idea of the present invention, shall fall within the protection scope of the present invention.

Claims

1. A plastic impact specimen sample holder for laboratory light source exposure test, characterized in that: It includes a main clamping frame, a rear fixed frame and a positioning strip, wherein the main clamping frame is provided with an exposure window, and guard edges are respectively provided on the left and right sides of the back side of the main clamping frame, and a receiving groove is formed between the inner side surface of the guard edge and the back side of the main clamping frame. The positioning strips are respectively installed in the receiving grooves on the left and right sides, and the positioning strips are provided with at least one bayonet. During the test, the two ends of the plastic impact specimen will be respectively clamped in the bayonet of the positioning strips on both sides, and the rear fixed frame is clamped behind the main clamping frame, and the rear fixed frame is pressed on the positioning strip or the plastic impact specimen.

2. The plastic impact specimen sample holder for laboratory light source exposure test according to claim 1, characterized in that: The positioning strip is provided with a bent edge for pressing against the plastic impact test specimen, and the bayonet is formed between two of the bent edges.

3. The plastic impact specimen sample holder for laboratory light source exposure test according to claim 2, characterized in that: Both ends of the retaining edge are respectively provided with limiting edges bent inwardly, and the limiting edges are provided with clamping holes. Both ends of the positioning strip are respectively provided with protruding buckles, and the buckles are fitted and inserted into the clamping holes.

4. The plastic impact specimen sample holder for laboratory light source exposure test according to claim 2, characterized in that: The slots on the positioning strip are spaced apart from each other so that during the test, there is a space between two adjacent plastic impact specimens.

5. The plastic impact specimen sample holder for laboratory light source exposure test according to claim 1, characterized in that: The two ends of the retaining edge are respectively provided with clips, and the clips are used to press on the back side of the rear fixing frame so that the rear fixing frame is clamped between the clips and the positioning strip or the plastic impact test specimen.

6. The plastic impact specimen sample holder for laboratory light source exposure test according to claim 5, characterized in that: The clamping pieces include a tall clamping piece and a short clamping piece, and the tall clamping piece and the short clamping piece are respectively arranged side by side at two ends of the retaining edge, and the distance between the tall clamping piece and the main clamping frame is greater than the distance between the short clamping piece and the main clamping frame; when the plastic impact specimen is installed flat in the sample clamp, the rear fixing frame is clamped between the short clamping piece and the positioning bar or the plastic impact specimen, and when the plastic impact specimen is installed upright in the sample clamp, the rear fixing frame is clamped between the tall clamping piece and the positioning bar or the plastic impact specimen.

7. The plastic impact specimen sample holder for laboratory light source exposure test according to claim 5 or 6, characterized in that: The clip is provided with a protrusion, and the protrusion is used to press on the rear fixing frame.

8. The plastic impact specimen sample holder for laboratory light source exposure test according to claim 1, characterized in that: The exposure window is rectangular.

9. The plastic impact specimen sample holder for laboratory light source exposure test according to claim 1, characterized in that: The rear fixing frame is provided with a ventilation opening.

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