O-shaped ring compression deformation test tool

Abstract

The utility model relates to the technical field of O-shaped rings, in particular to an O-shaped ring compression deformation testing tool which comprises an upper clamp and a lower clamp, a sample taken from an O-shaped ring to be tested is arranged between the upper clamp and the lower clamp, the bottom of the lower clamp is fixedly connected with a fixing piece, the top of the fixing piece is fixedly connected with a compression screw rod, and the compression screw rod is fixedly connected with a screw rod. According to the utility model, the limiters and the protection rings are alternately arranged between the upper clamp and the lower clamp, so that the upper clamp and the lower clamp are locked by matching the compression nut with the compression screw, and the upper clamp and the lower clamp clamp a sample of an O-shaped ring to be tested; when an O-shaped ring compression deformation test is carried out in an environment in which hot air flow changes stability, a gap for assisting hot air to pass through is formed between the upper clamp and the lower clamp by using the limiter, so that a sample of the O-shaped ring to be tested can be ensured to be in full contact with the hot air.

Description

Technical Field

[0001] The utility model relates to the technical field of O-rings, in particular to an O-ring compression deformation testing tool. Background Art

[0002] An O-ring is a rubber sealing ring with a circular cross-section. Because its cross-section is O-shaped, it is called an O-shaped rubber sealing ring, also called an O-ring. In order to ensure the quality of the O-ring, the O-ring needs to be subjected to a compression deformation test.

[0003] In the prior art, a method for measuring the permanent compression deformation of a sealing ring, such as that proposed in patent application number "CN201510808437.2", includes the following steps: 1) cutting a number of samples from the sealing ring to be tested; 2) clamping each sample in a fixture.

[0004] However, when the clamp mentioned in the above patent application clamps the sealing ring sample and tests the sealing ring in a container where the temperature is changed by hot air, the sealing ring cannot fully contact the hot air flow, which may affect the accuracy of the compression deformation test results. Utility Model Content

[0005] The purpose of the present invention is to provide an O-ring compression deformation testing tool to solve the problems raised in the above background technology.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] A tool for testing compression deformation of an O-ring comprises an upper fixture and a lower fixture, wherein a sample taken from the O-ring to be tested is arranged between the upper fixture and the lower fixture, the bottom of the lower fixture is fixedly connected to a fixing piece, the top of the fixing piece is fixedly connected to a clamping screw, the top of the clamping screw passes through the lower fixture and the upper fixture in sequence, and the top of the clamping screw is threadedly connected to a clamping nut.

[0008] A protective ring is arranged between the upper clamp and the lower clamp, and a limiter is arranged on the tightening screw. The limiter is provided with a U-shaped slot for clamping the limiter onto the tightening screw. The limiter and the protective ring are staggered in the vertical direction to form a gap between the upper clamp and the lower clamp to assist the passage of hot air.

[0009] Preferably, the centers of the upper clamp, the lower clamp and the protective ring are located in the same vertical direction, and the compression screws are arranged in a ring array on the outer surface of the sample.

[0010] Preferably, the protective ring includes a first arc-shaped member and a second arc-shaped member connected together, the first arc-shaped member is provided with clamping grooves at both ends, and the second arc-shaped member is fixedly connected with clamping protrusions used in conjunction with the clamping grooves at both ends.

[0011] Preferably, a positioning mechanism is provided between the upper clamp and the lower clamp, and the positioning mechanism includes a connecting plate, the top of the connecting plate is fixedly connected to a first clamping member, the bottom of the connecting plate is fixedly connected to a second clamping member, and U-shaped grooves are provided on the first clamping member and the second clamping member.

[0012] Preferably, the bottom of the compression screw protrudes below the fixing piece, and the compression screw and the U-shaped groove are adapted to each other.

[0013] Preferably, a support ring is fixedly connected at the center of the bottom of the lower clamp, and a positioning slot in a ring array is opened at the bottom of the support ring. A clamping protrusion is fixedly connected in the positioning slot, the positioning slot and the second clamping member are adapted to each other, and the clamping protrusion and the U-shaped groove are adapted to each other.

[0014] Beneficial effects of the utility model:

[0015] The utility model alternately arranges limiters and protective rings between the upper clamp and the lower clamp, so that the upper clamp and the lower clamp are locked by a compression nut in cooperation with a compression screw, so that the upper clamp and the lower clamp clamp the O-ring sample to be tested. When the O-ring compression deformation test is performed in an environment where a stable environment is changed by a hot air flow, the limiter is used to form a gap between the upper clamp and the lower clamp for assisting the passage of hot air, thereby ensuring that the O-ring sample to be tested can fully contact the hot air and the accuracy of the test results is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, it is possible for a person skilled in the art to derive other drawings based on these drawings without inventive effort.

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 This utility model Figure 1 Schematic diagram of the connection between the upper and lower clamps;

[0019] Figure 3 This utility model Figure 2 Schematic diagram of the structure of the bottom of the middle and lower clamps;

[0020] Figure 4 This utility model Figure 2 A schematic structural diagram of the first arc-shaped member;

[0021] Figure 5 This utility model Figure 2 A schematic structural diagram of the second arc-shaped member;

[0022] Figure 6 This utility model Figure 2 Schematic diagram of the structure of the limiter.

[0023] The reference numerals in the figures are as follows:

[0024] 1. Upper clamp, 2. Lower clamp, 3. Specimen, 4. Fixing part, 5. Compression screw, 6. Compression nut, 7. Protective ring, 701. First arc-shaped part, 702. Second arc-shaped part, 8. Limiter, 9. Clamping groove, 10. Clamping protrusion, 11. Connecting plate, 12. First clamping part, 13. Second clamping part, 14. U-shaped groove, 16. Support ring, 17. Positioning slot, 18. Clamping protrusion. DETAILED DESCRIPTION

[0025] 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.

[0026] A tool for testing compression deformation of an O-ring comprises an upper fixture 1 and a lower fixture 2, wherein a sample 3 taken from the O-ring to be tested is arranged between the upper fixture 1 and the lower fixture 2, the bottom of the lower fixture 2 is fixedly connected to a fixing part 4, the top of the fixing part 4 is fixedly connected to a clamping screw 5, the top of the clamping screw 5 passes through the lower fixture 2 and the upper fixture 1 in sequence, and the top of the clamping screw 5 is threadedly connected to a clamping nut 6.

[0027] A protective ring 7 is arranged between the upper clamp 1 and the lower clamp 2, and a limiter 8 is arranged on the tightening screw 5. The limiter 8 is provided with a U-shaped slot for clamping the limiter 8 onto the tightening screw 5. The limiter 8 and the protective ring 7 are staggered in the vertical direction to form a gap between the upper clamp 1 and the lower clamp 2 for assisting the passage of hot air.

[0028] like Figure 2 and Figure 6 , sample 3 is taken from the sealing ring to be tested. After the sample 3 is squeezed by the upper clamp 1 and the lower clamp 2, the sample 3 can be placed in a closed container. The hot air flow is generated by the hot air blower in the closed container to change the temperature of the space where the sample 3 is located. At the temperature, the compression deformation test of the sample 3 (i.e., the O-ring) is performed. Limiters 8 are provided between the upper clamp 1 and the protective ring 7, between the protective ring 7 and the protective ring 7, and between the protective ring 7 and the lower clamp 2. The limiter 8 is clamped on the compression screw 5.

[0029] The centers of the upper fixture 1 , the lower fixture 2 and the protective ring 7 are located in the same vertical direction, and the pressing screws 5 are arranged in a ring array on the outer surface of the sample 3 .

[0030] like Figure 2 and Figure 3 There are openings on both the upper clamp 1 and the lower clamp 2 to facilitate the passage of the tightening screw 5.

[0031] The protection ring 7 includes a first arc-shaped member 701 and a second arc-shaped member 702 connected together. Clamping grooves 9 are opened at both ends of the first arc-shaped member 701, and clamping protrusions 10 used in conjunction with the clamping grooves 9 are fixedly connected at both ends of the second arc-shaped member 702.

[0032] like Figure 2 、 Figure 4 and Figure 5 By cooperating with the groove 9 and the clamping protrusion 10, the first arc-shaped member 701 and the second arc-shaped member 702 are clamped together. Conversely, by pulling the first arc-shaped member 701 and the second arc-shaped member 702 away from each other, the first arc-shaped member 701 and the second arc-shaped member 702 can be separated, and the protective ring 7 can be directly removed from between the upper clamp 1 and the lower clamp 2. There is no need to separate the upper clamp 1 and the clamping screw 5, and the sample 3 can be quickly placed between the upper clamp 1 and the lower clamp 2, or the sample 3 between the upper clamp 1 and the lower clamp 2 can be removed.

[0033] A positioning mechanism is provided between the upper clamp 1 and the lower clamp 2, and the positioning mechanism includes a connecting plate 11, the top of the connecting plate 11 is fixedly connected to a first pressing member 12, and the bottom of the connecting plate 11 is fixedly connected to a second pressing member 13, and U-shaped grooves 14 are provided on the first pressing member 12 and the second pressing member 13.

[0034] like Figure 1 、 Figure 2 and Figure 3 The positioning mechanism has various specifications, and the length of the connecting plate 11 of each specification is different. You can choose according to actual needs when using it. When locking the clamping nut 6 so that the upper clamp 1 and the lower clamp 2 clamp the sample 3, by inserting the clamping screw 5 into the U-shaped groove 14, the first clamping member 12 and the second clamping member 13 can be pressed against the surface of the fixing member 4 and the surface of the clamping nut 6 respectively, to prevent the clamping nut 6 from loosening.

[0035] The bottom of the compression screw 5 protrudes below the fixing member 4 , and the compression screw 5 is adapted to the U-shaped groove 14 .

[0036] A support ring 16 is fixedly connected at the center of the bottom of the lower clamp 2. A positioning slot 17 in a ring array is provided at the bottom of the support ring 16. A clamping protrusion 18 is fixedly connected in the positioning slot 17. The positioning slot 17 is adapted to the second clamping member 13, and the clamping protrusion 18 is adapted to the U-shaped groove 14.

[0037] like Figure 1 、 Figure 2 and Figure 3 One end of the second pressing member 13 can be snapped into the positioning slot 17, and the clamping protrusion 18 is correspondingly snapped into the U-shaped slot 14, which assists in positioning the second pressing member 13 and improves the stability of the positioning mechanism.

[0038] The working principle of the O-ring compression deformation test tool provided by the utility model is as follows:

[0039] When the O-ring sample 3 is placed on top of the lower clamp 2, the limiter 8 and the protective ring 7 are put on top of the tightening screw 5 in turn, and then the top of the tightening screw 5 is passed through the upper clamp 1 and threadedly connected to the tightening screw 5 using the tightening nut 6. The tightening nut 6 tightens the upper clamp 1, and the upper clamp 1 and the lower clamp 2 compress the O-ring sample 3, and then put it into a container heated by hot air flow outside to perform the O-ring compression deformation test.

[0040] Compared with related technologies, the O-ring compression deformation test tool provided by the present invention has the following beneficial effects:

[0041] The utility model alternately arranges limiters 8 and protective rings 7 between the upper clamp 1 and the lower clamp 2, so that the upper clamp 1 and the lower clamp 2 are locked by the compression nut 6 in cooperation with the compression screw 5, so that the upper clamp 1 and the lower clamp 2 clamp the sample 3 of the O-ring to be tested. When the O-ring compression deformation test is performed in an environment where a stable environment is changed by hot air flow, the limiter 8 is used to form a gap between the upper clamp 1 and the lower clamp 2 for assisting the passage of hot air, thereby ensuring that the sample 3 of the O-ring to be tested can fully contact the hot air and ensure the accuracy of the test results.

[0042] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention as claimed.

Claims

1. An O-ring compression deformation test fixture, comprising an upper fixture (1) and a lower fixture (2), wherein a sample (3) taken from the O-ring to be tested is arranged between the upper fixture (1) and the lower fixture (2), and characterized in that: The bottom of the lower clamp (2) is fixedly connected to a fixing piece (4), the top of the fixing piece (4) is fixedly connected to a clamping screw (5), the top of the clamping screw (5) passes through the lower clamp (2) and the upper clamp (1) in sequence, and the top of the clamping screw (5) is threadedly connected to a clamping nut (6); A protective ring (7) is provided between the upper clamp (1) and the lower clamp (2), a limiter (8) is provided on the compression screw (5), a U-shaped slot is provided on the limiter (8) for clamping the limiter (8) onto the compression screw (5), and the limiter (8) and the protective ring (7) are staggered in the vertical direction to form a gap between the upper clamp (1) and the lower clamp (2) for assisting the passage of hot air.

2. The O-ring compression deformation testing tool according to claim 1, characterized in that: The centers of the upper clamp (1), the lower clamp (2) and the protective ring (7) are located in the same vertical direction, and the pressing screws (5) are arranged in a ring array on the outer surface of the sample (3).

3. The O-ring compression deformation testing tool according to claim 2, characterized in that: The protective ring (7) comprises a first arc-shaped member (701) and a second arc-shaped member (702) connected together, wherein clamping grooves (9) are provided at both ends of the first arc-shaped member (701), and clamping protrusions (10) used in conjunction with the clamping grooves (9) are fixedly connected at both ends of the second arc-shaped member (702).

4. The O-ring compression deformation testing tool according to claim 1, characterized in that: A positioning mechanism is provided between the upper clamp (1) and the lower clamp (2), and the positioning mechanism comprises a connecting plate (11), the top of the connecting plate (11) is fixedly connected to a first pressing member (12), the bottom of the connecting plate (11) is fixedly connected to a second pressing member (13), and both the first pressing member (12) and the second pressing member (13) are provided with a U-shaped groove (14).

5. The O-ring compression deformation testing tool according to claim 4, characterized in that: The bottom of the pressing screw (5) protrudes below the fixing member (4), and the pressing screw (5) and the U-shaped groove (14) are adapted to each other.

6. The O-ring compression deformation testing tool according to claim 5, characterized in that: A support ring (16) is fixedly connected at the center of the bottom of the lower clamp (2); a positioning slot (17) in an annular array is provided at the bottom of the support ring (16); a clamping protrusion (18) is fixedly connected in the positioning slot (17); the positioning slot (17) is adapted to the second pressing member (13); and the clamping protrusion (18) is adapted to the U-shaped groove (14).

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