Sample clamp for needle flame test

Abstract

The utility model discloses a sample clamp for a needle flame test, which comprises a bracket (1) and a clamping assembly (2) suspended on the bracket (1), and is characterized in that the clamping assembly (2) comprises a connecting seat (21) connected to the bracket (1); the first end of the flexible arm (22) is connected with the connecting seat (21); and the clamping piece (23) is arranged at the second end of the flexible arm (22). Compared with the prior art, the sample clamp for the needle flame test can fix a sample in any direction.

Description

TECHNICAL FIELD

[0001] The utility model relates to combustion test equipment technical field, specifically point to a kind of sample fixture for needle flame test. BACKGROUND

[0002] The needle flame test equipment is a kind of equipment for simulating and researching the combustion process of components. The needle flame test equipment in the prior art is usually to place the material on the combustion table, and the operator takes the ignition assembly to burn the material to be burned.

[0003] The patent application No. CN201720143351.7 of China "a needle flame tester" discloses a needle flame tester, which comprises a sample clamp mechanism and an ignition needle mechanism. The sample clamp mechanism comprises a clamp support, a sample clamp, a clamp tension adjusting handle, a sample clamp longitudinal adjusting handle, and a sample clamp lifting adjusting handle. The ignition needle mechanism comprises a base, a power device, a support rod, a burner support platform, an igniter seat, an angle adjusting handle, an ignition needle, and a burner support platform lifting adjusting handle.

[0004] However, the existing sample fixture for needle flame test is currently mainly single fixed table surface matched with small clamps, and the sample fixing direction is single, so it is difficult to realize the simulation of the position and situation of flame burning in actual work. INVENTION CONTENTS

[0005] The utility model solves the technical problem to provide a kind of sample fixture for needle flame test that can realize the fixation of sample in any direction.

[0006] The utility model solves the technical problem by the technical scheme that a kind of sample fixture for needle flame test, including support and the clamping component of hanging on the support, characterized in that: the clamping component includes

[0007] Connecting seat, connected on the support;

[0008] Flexible arm, first end is connected with the connecting seat;And

[0009] Clamping piece, is located at the second end of the flexible arm.

[0010] In order to facilitate the processing of flexible arm, the flexible arm includes a plurality of sequentially connected movable joints, the two ends of each movable joint are provided with protrusions and grooves respectively, and the protrusions of the previous movable joint are rotatably accommodated in the grooves of the next movable joint and frictionally contacted.

[0011] In order to improve the friction between the adjacent two movable joints, the outer wall of the protrusion and the outer wall of the groove are spherical.

[0012] In order to further improve the freedom of the clamping piece, a rotating groove is formed on the connecting seat, the movable joint is spherical, and the front movable joint is rotatably accommodated in the rotating groove and is in frictional contact.

[0013] In order to realize clamping of various shape samples, the clamping piece comprises

[0014] two symmetrically arranged clamping jaws, each clamping jaw comprising an angularly connected first arm portion and a second arm portion, the first arm portions of the two clamping jaws being hingedly connected to each other, and the end of the first arm portion of one of the clamping jaws being connected to the second end of the flexible arm; and

[0015] a resilient member acting between the two clamping jaws to always have the second arm portions of the two clamping jaws have a tendency to approach each other.

[0016] In order to increase the friction force, the opposite surfaces of the second arm portions of the two clamping jaws are serrated.

[0017] In order to facilitate installation of the resilient member, the resilient member is a tension spring, and the two ends of the tension spring are respectively connected to the first arm portions of the two clamping jaws.

[0018] In order to facilitate simultaneous testing of multiple samples, the connecting seat is disc-shaped, the number of the flexible arms is at least two, and the flexible arms are arranged at the bottom of the connecting seat in a circumferential direction, and the number of the clamping pieces is at least two and corresponds to the flexible arms one by one.

[0019] In order to facilitate suspension of the clamping assembly, the support comprises a table top and a fixing rod arranged on the table top, and the connecting seat is connected to the fixing rod.

[0020] In order to meet the testing requirements of different heights, the fixing rod is a screw rod extending in a vertical direction, and the connecting seat is threadedly connected to the screw rod.

[0021] Compared with the prior art, the advantages of the utility model lie in that: the connecting seat, the flexible arm and the clamping piece are sequentially connected to form a clamping assembly which is suspended on the support, the flexible arm can be bent to adjust the direction and position of the sample, the sample is fixed in any direction, and the sample is more effectively simulated in the actual working position of flame combustion. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a front view of an embodiment of the sample clamp for pin flame test of the utility model;

[0023] Figure 2 It is a front view of an embodiment of the sample clamp for pin flame test of the utility model; Figure 1 It is a front view of an embodiment of the sample clamp for pin flame test of the utility model;

[0024] It is a front view of an embodiment of the sample clamp for pin flame test of the utility model;Figure 3 For Figure 1 An enlarged view of the middle clamping member portion. DETAILED DESCRIPTION

[0025] The utility model will be described in further detail below in connection with the drawings.

[0026] In the description and claims of the utility model, terms of direction, such as "front", "back", "up", "down", "left", "right", "side", "top", "bottom" and the like, are used to describe various example structural parts and elements of the utility model, but these terms are used herein only for the purpose of convenience of description and are determined based on the example orientation shown in the drawings. Since the embodiments disclosed by the utility model can be arranged in different directions, these terms of direction are only used for description and should not be regarded as limitation, for example, "up" and "down" are not necessarily limited to the direction opposite or consistent with the direction of gravity.

[0027] As Figures 1 to 3 shown, it is a preferred embodiment of the sample clamp for needle flame test of the utility model. The sample clamp for needle flame test comprises a support 1 and a clamping assembly 2 hung on the support 1.

[0028] The support 1 comprises a table top 11 and a fixed rod 12 arranged on the table top 11. Specifically, the table top 11 is horizontally arranged; the fixed rod 12 is a screw rod extending in the vertical direction.

[0029] The clamping assembly 2 comprises a connecting seat 21, a flexible arm 22 and a clamping member 23 connected in sequence.

[0030] Specifically, the connecting seat 21 is disc-shaped and is threadedly connected on the fixed rod 12; a plurality of rotating grooves 211 are arranged on the bottom of the connecting seat 21 and are spaced apart in the circumferential direction.

[0031] The number of the flexible arms 22 is multiple and corresponds to the rotating grooves 211 one by one. Each flexible arm 22 comprises a plurality of movable joints 221 connected in sequence from top to bottom, each movable joint 221 is spherical, the bottom end of each movable joint 221 is provided with a protrusion 2211, and the top end of each movable joint 221 is provided with a recess 2212, the outer wall of the protrusion 2211 and the outer wall of the recess 2212 are spherical. The frontmost movable joint 221 is rotatably accommodated in the corresponding rotating groove 211 and is in frictional contact, among the adjacent two movable joints 221, the protrusion 2211 of the front movable joint 221 is rotatably accommodated in the recess 2212 of the rear movable joint 221 and is in frictional contact.

[0032] The number of the clamping members 23 is multiple and corresponds to the flexible arms 22. Each clamping member 23 comprises two symmetrical clamping jaws 231 and an elastic member 232 connected between the two clamping jaws 231. Each clamping jaw 231 comprises a first arm portion 2311 and a second arm portion 2312 connected at an angle from top to bottom; the middle portions of the first arm portions 2311 of the two clamping jaws 231 are hinged to each other, and the top end of the first arm portion 2311 of one of the clamping jaws 231 is connected to the bottom end of the last movable joint 221; the opposite surfaces of the second arm portions 2312 of the two clamping jaws 231 are sawtooth-shaped. The elastic member 232 is a tension spring, the two ends of which are connected to the lower portions of the first arm portions 2311 of the two clamping jaws 231, so that the second arm portions 2312 of the two clamping jaws 231 always have a tendency to move towards each other, thereby clamping the sample.

[0033] The working principle of the embodiment is as follows: before testing, the connecting seat 21 is rotated to adjust the entire clamping assembly 2 to an appropriate height, then the sample is clamped between the second arm portions 2312 of the two clamping jaws 231, and finally the flexible arms 22 are bent to adjust the direction and position of the sample. In the adjustment process, the two adjacent movable joints 221 rotate relative to each other and are kept relatively fixed by the friction therebetween, so that the sample can be inclined, suspended, etc. in any direction. Compared with the single horizontal or vertical fixing surface of the conventional needle flame test equipment, the sample can be more effectively simulated in the actual working position of the flame.

[0034] In addition, according to the test standards and the requirements of the test itself, for samples with multiple different thicknesses, shapes, etc., the test should be performed on the weakest part. Therefore, for some samples with their own unique shapes, the traditional needle flame equipment cannot find the weakest part. The present application can realize inclination, overturning, suspension, etc. in various directions so that different positions can be exposed, thereby more accurately judging the test results.

Claims

1. A sample holder for needle flame testing, comprising a support (1) and a clamping assembly (2) suspended from the support (1), characterized in that: The clamping assembly (2) comprises a connecting base (21) connected to the support (1); a flexible arm (22) having a first end connected to the connecting base (21); and a clamping piece (23) provided at a second end of the flexible arm (22).

2. The pin flame test sample holder of claim 1, wherein: The flexible arm (22) comprises a plurality of movable joints (221) connected in sequence, each movable joint (221) has a protrusion (2211) and a groove (2212) at two ends thereof, and the protrusion (2211) of a previous movable joint (221) is rotatably accommodated in the groove (2212) of a subsequent movable joint (221) and is in frictional contact.

3. The pin flame test sample holder of claim 2, wherein: The outer wall of the protrusion (2211) and the outer wall of the groove (2212) are spherical.

4. The pin flame test sample holder of claim 2, wherein: The connecting base (21) is provided with a rotating groove (211), the movable joints (221) are spherical, and the frontmost movable joint (221) is rotatably accommodated in the rotating groove (211) and is in frictional contact.

5. The pin flame test sample holder of claim 1, wherein: The clamping piece (23) comprises two symmetrically arranged clamping jaws (231), each clamping jaw (231) comprises an angularly connected first arm portion (2311) and a second arm portion (2312), the first arm portions (2311) of the two clamping jaws (231) are hingedly connected to each other, and the end of the first arm portion (2311) of one of the clamping jaws (231) is connected to the second end of the flexible arm (22); and a resilient member (232) acting between the two clamping jaws (231) to cause the second arm portions (2312) of the two clamping jaws (231) to always have a tendency to move towards each other.

6. The pin flame test sample holder of claim 5, wherein: The opposite surfaces of the second arm portions (2312) of the two clamping jaws (231) are sawtooth-shaped.

7. The pin flame test sample holder of claim 5, wherein: The resilient member (232) is a tension spring, and the two ends of the tension spring are connected to the first arm portions (2311) of the two clamping jaws (231), respectively.

8. The pin flame test sample holder of claim 1, wherein: The connecting base (21) is disc-shaped, the number of the flexible arms (22) is at least two, and the flexible arms (22) are arranged at the bottom of the connecting base (21) in a circumferential direction, and the number of the clamping pieces (23) is at least two and corresponds to the number of the flexible arms (22).

9. The pin flame test sample holder of any one of claims 1 to 8, wherein: The support (1) comprises a table top (11) and a fixing rod (12) provided on the table top (11), and the connecting base (21) is connected to the fixing rod (12).

10. The pin flame test sample holder of claim 9, wherein: The fixing rod (12) is a screw rod extending in a vertical direction, and the connecting base (21) is threadedly connected to the screw rod.

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