A hair clip band flexibility testing device

Abstract

The utility model relates to hair clip belt technical field, especially a kind of hair clip belt tenacity testing device, including installation base and mounting bracket, installation base is provided with the clamping mechanism for clamping fixed hair bundle two end positions, clamping mechanism includes the clamping plate of hair bundle by curved surface engagement, installation base still includes the drive mechanism for pulling clamping plate horizontal movement, drive mechanism includes universal joint for cooperating clamping plate to carry out flexible traction to hair bundle, limiting mechanism for limiting the initial test length of hair bundle is fixedly installed on mounting bracket.This utility model adopts S-shaped occlusion channel by upper and lower clamping plate waveform channel cooperation.Using the winch mechanics in rope makes hair bundle pass through bending in S-shaped channel inside, it is helpful to increase contact area and frictional resistance, so that it can obtain huge tensile locking force under smaller vertical gap force, effectively avoid crushing hair bundle local structure due to excessive pressure.

Description

Technical Field

[0001] This utility model relates to the field of hair clip technology, and in particular to a hair clip toughness testing device. Background Technology

[0002] Hair tension is an important indicator for evaluating hair health and the repairing efficacy of shampoo and conditioner. In a laboratory setting, standard-length hair strands need to be stretched until they break, and their stress curves are recorded.

[0003] Existing technologies often employ a hair strength tester, such as the one disclosed in CN209820875U. This device includes a base, a fixed clamp and a movable clamp mounted on the base, and a lead screw assembly that drives the movable clamp. While this existing technology can achieve basic tensile testing functions, in practical use, such traditional devices still have the following significant drawbacks: First, existing technologies often use rigid clamps to directly press the hair bundle; if the clamping force is too large, the hair bundle is prone to breakage of the hair cuticles at the clamp port due to stress concentration, causing the hair bundle to break at the clamping point before the test actually begins, easily leading to invalid data; if the clamping force is insufficient, the hair bundle is prone to slipping during axial movement, making it impossible to measure the true breaking strength; second, the drive shaft and movable clamp of existing devices are rigidly connected. Because hair strands are extremely soft and flexible materials, it is difficult to ensure that the mechanical tensile tension of the hair strand and the equipment is completely aligned during manual clamping. Once there is a slight angular deviation, non-deformable shear force will be generated during the stretching process, resulting in falsely high or low force values ​​from the sensor, which cannot reflect the true material properties of the hair strand. Finally, different testing standards require adjustment of the testing gap. Current technology requires operators to manually move the clamp position after measuring with a ruler, which is not only inefficient, but also leads to data consistency errors in multiple parallel experiments due to manual reading and parallax adjustment. Utility Model Content

[0004] The purpose of this invention is to solve the problems of hair strand damage, hair strand slippage, and low testing accuracy in existing technologies, and to propose a hair strand toughness testing device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A hair tie toughness testing device includes a mounting base and a mounting bracket. The mounting base is provided with a clamping mechanism for clamping and fixing the two ends of a hair tie. The clamping mechanism includes a clamping plate that clamps the hair tie through curved surface engagement. The mounting base also includes a driving mechanism for pulling the clamping plate horizontally. The driving mechanism includes a universal joint for flexibly pulling the hair tie in conjunction with the clamping plate. The mounting bracket is fixedly mounted with a limiting mechanism for limiting the initial test length of the hair tie.

[0006] Preferably, the mounting bracket has a U-shaped structure and is fixedly installed at the top center of the mounting base.

[0007] Preferably, the clamping mechanism includes a rectangular mounting groove in the middle of the mounting clamping plate, two limiting slide grooves on the left and right sides of the clamping plate, a clamping claw slidably mounted on the limiting slide groove, and a drive component for traction provided in the rectangular mounting groove.

[0008] Preferably, the clamping claw consists of an upper clamping plate and a lower clamping plate, and the inner sides of the upper clamping plate and the lower clamping plate are provided with a waveform engagement channel. When the upper clamping plate and the lower clamping plate are closed, the opposite waveform layers cooperate with each other to form an S-shaped engagement channel, which is used to prevent the hair bundle from being damaged when it is locked.

[0009] Preferably, the drive assembly includes a drive gear rotatably mounted in the middle of a rectangular mounting slot, and a first rack plate and a second rack plate, which are respectively used to pull the upper clamping plate and the lower clamping plate, are slidably mounted on the left and right ends of the drive gear, and the first rack plate and the second rack plate are meshed with the drive gear.

[0010] Preferably, two sets of clamping plates are symmetrically arranged on the left and right sides, with the left clamping plate fixedly installed on the mounting base and the right clamping plate slidably installed on the mounting base.

[0011] Preferably, the drive mechanism includes a first mounting base fixedly installed on the top of the mounting base, the first mounting base being provided with a guide component for movably installing a universal joint, a guide groove being provided at the top of the mounting base, a drive block being slidably installed on the guide groove, and a rectangular block for centering and resetting the clamping plate being fixedly installed at the top of the drive block.

[0012] Compared with the prior art, the present invention has the following advantages: 1. This utility model employs an S-shaped interlocking channel formed by the cooperation of upper and lower clamping plates with wave-shaped channels. Utilizing the winch mechanics within the rope, the hair bundle bends within the S-shaped channel, increasing the contact area and frictional resistance, thus achieving a large tensile locking force with relatively small vertical gap force. This effectively prevents the hair bundle's local structure from being crushed due to excessive pressure, prevents slippage under high tension, and ensures that the breakage point always occurs at the center of the test section.

[0013] 2. This utility model uses a rectangular block, damping rod, guide post and universal joint to allow for slight angular deviations in the hair bundle clamping. The universal joint adapts to the elastic contraction of the damping rod, allowing the rectangular plate to make slight inertial floating and automatic angle compensation, thereby helping to eliminate unexpected shear forces and collected values, and ensuring the accuracy of the experimental data collected by the sensor.

[0014] 3. This utility model uses a limiting mechanism, allowing operators to directly rotate the drum to select the corresponding position. Primary positioning can be achieved through hard limiting, which helps to eliminate errors caused by human measurement and effectively improves the consistency of experimental data. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a hair clip toughness testing device proposed in this utility model; Figure 2 This is a schematic diagram of the clamping mechanism of a hair clip toughness testing device proposed in this utility model; Figure 3 This is a schematic diagram of the clamping plate structure of a hair clip toughness testing device proposed in this utility model; Figure 4 This is a cross-sectional schematic diagram of the drive mechanism of a hair clip toughness testing device proposed in this utility model; Figure 5 This is a schematic diagram of the limiting mechanism structure of a hair clip toughness testing device proposed in this utility model.

[0016] In the diagram: 1. Mounting base; 2. Clamping mechanism; 21. Clamping plate; 22. Rectangular block; 23. Guide groove; 24. Second mounting base; 25. Rectangular mounting slot; 26. Drive gear; 27. First rack plate; 28. Upper clamping plate; 29. ​​Lower clamping plate; 210. Second rack plate; 3. Drive mechanism; 31. First mounting base; 32. Guide assembly; 33. Universal joint; 34. Drive block; 35. Damping rod; 36. Guide column; 4. Limiting mechanism; 41. Mounting bracket; 42. Rotary drum; 43. Limiting stop bar; 44. Rectangular groove. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0018] Reference Figures 1-5 A hair clip toughness testing device includes a mounting base 1 and a mounting bracket 41. The mounting bracket 41 has an inverted U-shaped door structure, which is connected and fixed in the lower part of the middle of the mounting base 1 to provide a high mounting point for the limiting mechanism 4 and avoid axial testing actions that are interfered with from below.

[0019] In some specific embodiments, the mounting base 1 is provided with a clamping mechanism 2 for clamping and fixing the two ends of the hair bundle. The clamping mechanism 2 includes a rectangular mounting groove 25 opened in the middle of the mounting clamping plate 21. Two limiting slide grooves are opened on the left and right sides of the clamping plate 21. Claws are slidably installed on the limiting slide grooves. A drive component for traction is provided in the rectangular mounting groove 25.

[0020] The clamp consists of an upper clamping plate 28 and a lower clamping plate 29. The inner sides of the upper clamping plate 28 and the lower clamping plate 29 are provided with a wave-shaped engagement channel. When the upper clamping plate 28 and the lower clamping plate 29 are closed, the opposite wave layers cooperate to form an S-shaped engagement channel, which is used to prevent the hair bundle from being damaged when it is locked. The S-shaped channel utilizes the winch effect in rope mechanics to increase friction by increasing the contact area of ​​the curved surface of the hair bundle, thereby preventing the hair bundle from opening during high tension testing without crushing the local structure of the hair bundle.

[0021] The drive assembly includes a drive gear 26 rotatably mounted in the center of a rectangular mounting slot 25. A first rack plate 27 and a second rack plate 210 are slidably mounted at the left and right ends of the drive gear 26, respectively, for pulling the upper clamping plate 28 and the lower clamping plate 29. The upper end of the first rack plate 27 is fixedly connected to the upper clamping plate 28, and the lower end of the second rack plate 210 is fixedly connected to the lower clamping plate 29. Both the first rack plate 27 and the second rack plate 210 are meshed with the drive gear 26 to support the drive mechanism 3 in performing axial testing of the hair bundle. The drive gear 26 is preferably connected to a servo motor. When the drive gear 26 is rotated clockwise, the first rack plate 27 moves upward and the second rack plate 210 moves downward, causing the upper clamping plate 28 and the lower clamping plate 29 to separate synchronously; conversely, rotating clockwise causes them to close synchronously.

[0022] Two sets of clamping plates 21 are symmetrically arranged on the left and right sides. The left clamping plate 21 is fixedly installed on the mounting base 1, and the right clamping plate 21 is slidably installed on the mounting base 1. A second mounting base 24 for installing the left clamping plate 21 is fixedly installed at the top left side of the mounting base 1. A universal joint 33 is also provided between the side wall of the second mounting base 24 and the left clamping plate 21.

[0023] The clamping mechanism 2 includes a clamping plate 21 that clamps the hair bundle through curved surface engagement. The mounting base 1 also includes a drive mechanism 3 for pulling the clamping plate 21 to move horizontally. The drive mechanism 3 includes a first mounting base 31 fixedly mounted on the top of the mounting base 1. The first mounting base 31 is provided with a guide assembly 32 for movably mounting a universal joint 33. The guide assembly 32 consists of a guide sleeve and a guide rod, and the universal joint 33 is rotatably mounted on the guide rod. A guide groove 23 is provided at the top of the mounting base 1. A drive block 34 is slidably mounted on the guide groove 23. A rectangular block 22 for centering the clamping plate 21 is fixedly mounted on the top of the drive block 34. The drive block 34 can preferably be driven by a screw.

[0024] The specific implementation of the lead screw is as follows: A precision lead screw is fitted inside the guide groove 23, and the lead screw is driven by a servo motor. A drive block 34 is slidably mounted on the guide groove 23, and the bottom of the drive block 34 is connected to the lead screw bolt pair to achieve precise linear relay.

[0025] A circular through hole is provided in the middle of the rectangular block 22. A guide post 36 for fixing the clamping plate 21 is movably installed in the circular through hole. Six damping rods 35 for centering and resetting the guide post 36 are fixedly installed on the inner wall of the circular through hole. The bottom end of the guide post 36 is fixedly installed with the universal joint 33.

[0026] In some specific embodiments, the drive mechanism 3 includes a universal joint 33 for flexibly pulling the hair bundle in conjunction with the clamping plate 21. A limiting mechanism 4 for limiting the initial test length of the hair bundle is fixedly installed on the mounting bracket 41. The limiting mechanism 4 includes a rectangular slide groove 44 opened on the side wall of the mounting bracket 41. A rotating cylinder 42 is slidably installed on the rectangular slide groove 44. Four limiting rods 43 are distributed in a circumferential spiral on the rotating cylinder 42, and the four limiting rods 43 correspond to hair bundle lengths of 10cm, 15cm, 20cm and 25cm respectively. A limiting slider for pulling the rotating cylinder 42 up and down is slidably installed in the rectangular slide groove 44. Preferably, an electric telescopic rod can directly drive the limiting slider in the rectangular slide groove 44, and a drive motor can preferably directly drive the rotating cylinder 42 on the limiting slider.

[0027] The drive motor, electric telescopic pole, and servo motor are all controlled by a servo controller.

[0028] It should be noted that the specific models and specifications of the drive motor, electric telescopic rod, and servo motor need to be selected and determined based on the actual specifications of the device. The specific selection and calculation methods use existing technology in this field, so they will not be elaborated here.

[0029] The functional principle of this utility model can be explained through the following operation methods: When it is necessary to test the hair strands: First, based on the preset standard length of 15cm, the drive motor is started, driving the rotating drum 42 to rotate, and the limiting stop 43 corresponding to the 15cm length position is rotated to the working position directly below. Immediately afterwards, the electric telescopic rod is activated, driving the rotating drum 42 to move downwards as a whole, so that the limiting stop 43 cuts into the moving path between the left and right clamping plates 21.

[0030] Subsequently, the servo motor controls the right-side movable clamping plate 21 to move towards the fixed end of the side wall, with its side wall abutting against the end side of the limit stop 43. At this time, the physical position of the center of the left and right clamping plates 21 is accurately set to 15cm, completing the initial calibration.

[0031] Secondly, after calibration, the drive gear 26 on the rotating drive mechanism is rotated. Since the drive gear 26 drives the first rack plate 27 and the second rack plate 210 on the left and right sides, the first rack plate 27 and the second rack plate 210 move in opposite directions, so that the upper clamping plate 28 and the lower clamping plate 29 open synchronously. Next, the two ends of the hair bundle are placed horizontally into the waveform channels of the left and right clamping mechanisms 2, respectively. Then, the drive gear 26 is rotated in the opposite direction, driving the upper clamping plate 28 and the lower clamping plate 29 to close synchronously. During this process, the relatively set waveform surfaces are tightly aligned and misaligned with each other, pressing the hair bundle into an S-shaped path, thereby using the winch mechanics to complete the S-shaped non-destructive engagement lock, ensuring that the hair bundle does not slip or get damaged in the subsequent high tension test.

[0032] After the hair bundle is clamped, the electric telescopic rod moves upward to its maximum, lifting the limit stop 43 away from the test area to avoid subsequent telescopic movements. Simultaneously, the drive mechanism 3 controls the drive block 34 to move uniformly to the right. The force transmission path is as follows: the drive block 34 transmits the force to the rectangular block 22, then through the six damping rods 35 for elastic equalization before transmitting it to the guide post 36, and finally through the universal joint 33 to the right clamping plate 21.

[0033] During the stretching process, if the hair bundle experiences uneven force due to the clamping angle, the damping rod 35 will undergo a slight elastic compression to absorb the closure. At the same time, the universal joint 33 will automatically deflect according to the direction of the force to automatically compensate for the stretching angle in real time.

[0034] Finally, data acquisition and equipment reset occur. As the stretching continues, once the hair strand reaches its limit and breaks, the system, in conjunction with the connected force sensor, automatically records the peak force and elongation at the moment of breakage. After the test, the drive mechanism 3 drives the right-side clamping plate 21 to quickly move to the left and reset, ready for the next set of tests.

[0035] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A hair clip toughness testing device, comprising a mounting base (1) and a mounting bracket (41), characterized in that, The mounting base (1) is provided with a clamping mechanism (2) for clamping and fixing the two ends of the hair bundle. The clamping mechanism (2) includes a clamping plate (21) for clamping the hair bundle by the engagement of curved surfaces. The mounting base (1) also includes a driving mechanism (3) for pulling the clamping plate (21) to move horizontally. The driving mechanism (3) includes a universal joint (33) for flexibly pulling the hair bundle in cooperation with the clamping plate (21). The mounting bracket (41) is fixedly installed with a limiting mechanism (4) for limiting the initial test length of the hair bundle.

2. The hair clip toughness testing device according to claim 1, characterized in that, The mounting bracket (41) has a U-shaped structure and is fixedly installed at the top center of the mounting base (1).

3. The hair clip toughness testing device according to claim 2, characterized in that, The clamping mechanism (2) includes a rectangular mounting groove (25) located in the middle of the mounting clamping plate (21). Two limiting slide grooves are provided on the left and right sides of the clamping plate (21). A clamping claw is slidably mounted on the limiting slide groove. A drive component for traction is provided in the rectangular mounting groove (25).

4. The hair clip toughness testing device according to claim 3, characterized in that, The clamp consists of an upper clamp plate (28) and a lower clamp plate (29), and the inner sides of the upper clamp plate (28) and the lower clamp plate (29) are provided with waveform engagement channels. When the upper clamp plate (28) and the lower clamp plate (29) are closed, the opposite waveform layers cooperate with each other to form an S-shaped engagement channel, which is used to prevent the hair bundle from being damaged when it is locked.

5. The hair clip toughness testing device according to claim 4, characterized in that, The drive assembly includes a drive gear (26) rotatably mounted in the middle of a rectangular mounting slot (25). The drive gear (26) has a first rack plate (27) and a second rack plate (210) slidably mounted on its left and right ends for pulling the upper clamping plate (28) and the lower clamping plate (29), respectively. The first rack plate (27) and the second rack plate (210) are both meshed with the drive gear (26).

6. The hair clip toughness testing device according to claim 5, characterized in that, Two sets of clamping plates (21) are symmetrically arranged on the left and right sides, and the left clamping plate (21) is fixedly installed on the mounting base (1), while the right clamping plate (21) is slidably installed on the mounting base (1).

7. The hair clip toughness testing device according to claim 6, characterized in that, The drive mechanism (3) includes a first mounting base (31) fixedly mounted on the top of the mounting base (1). The first mounting base (31) is provided with a guide assembly (32) for movably mounting a universal joint (33). A guide groove (23) is provided at the top of the mounting base (1). A drive block (34) is slidably mounted on the guide groove (23). A rectangular block (22) for centering and resetting the clamping plate (21) is fixedly mounted on the top of the drive block (34).

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