Abrasion resistance detection mechanism for precise plastic part

Abstract

The utility model relates to the technical field of detection of plastic parts, in particular to a wear resistance detection mechanism of a precise plastic part, which comprises two groups of connecting rods and two groups of clamping wheels, a sleeve is arranged at the top end of each connecting rod, an outer shaft is rotatably connected in an inner ring of each sleeve, an inner shaft insertion hole is formed in one end of each outer shaft, and an outer shaft insertion hole is formed in the other end of each outer shaft. One end of an inner shaft is movably inserted into the inner shaft insertion hole, and the clamping wheel is arranged at the other end of the inner shaft; the device has the advantages that the outer shafts are rotationally connected into the sleeves arranged at the top ends of the connecting rods, the inner shaft inserting holes are formed in the ends, close to each other, of the two outer shafts, the inner shafts are movably inserted into the inner shaft inserting holes, the clamping wheels are arranged on the surfaces of the ends, extending out of the inner shaft inserting holes, of the inner shafts, and the length of the inner shafts extending out of the inner shaft inserting holes is variable; therefore, the distance between the two sets of clamping wheels is variable, and the function that the abrasion resistance detection mechanism for the precise plastic parts can detect the abrasion resistance of the precise plastic parts of various different sizes is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic part detection, in particular to a wear resistance detection mechanism for precision plastic parts. Background Art

[0002] A plastic's wear resistance is one of its mechanical properties, reflecting its ability to resist external damage. It is primarily related to the plastic's rigidity and flexibility. The chemical composition of different molecules, the physical structure of the same macromolecule, the size and distribution of molecular weight, and the cohesive force of polymers all directly affect their wear resistance. Wear resistance is a key performance indicator in the current production and processing of precision plastic parts.

[0003] In the prior art, a patent document with application number 201320370500.5 discloses a patent entitled "Plastic Part Wear Test Device", which includes a friction mechanism and a fixing mechanism. The friction mechanism is driven by a power mechanism. The fixing mechanism presses the plastic part against the friction mechanism so that the friction mechanism performs a wear test on the plastic part. The friction mechanism and the fixing mechanism are arranged on a base. The friction mechanism consists of a wear disk and a rotating shaft. The fixing mechanism includes a pressure rod. The wear disk is fixed on the rotating shaft. The rotating shaft is arranged on the top of the base. The power mechanism is located inside the base. The output end of the power mechanism is connected to the rotating shaft to drive the rotating shaft and the wear disk to rotate. The plastic part wear test device adopts a structure combining a pressure rod and a wear disk, so that the plastic part is rotated and rubbed by the wear disk under the pressure of the pressure rod to perform a wear test. Its structure is simple, easy to operate, and conducive to improving work efficiency.

[0004] However, the two sets of clamping wheels in the prior art are rotatably connected to the connecting rod, the clamping wheels cannot move axially, and the distance between the two sets of connecting rods cannot be changed, which results in the distance between the two sets of clamping wheels being fixed. This makes the plastic wear resistance testing device in the prior art unable to be applied to the inspection of precision plastic workpieces of various sizes. Utility Model Content

[0005] The purpose of the present utility model is to provide a wear resistance detection mechanism for precision plastic parts to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a wear resistance detection mechanism for precision plastic parts, comprising: a connecting rod and a clamping wheel, each of the connecting rod and the clamping wheel is provided in two groups, a sleeve is provided at the top end of the connecting rod, the sleeve is an annular cylindrical structure, an outer shaft is rotatably connected to the inner ring of the sleeve, an inner shaft plug hole is provided at one end of the outer shaft, one end of the inner shaft is movably plugged into the inner shaft plug hole, and the clamping wheel is provided at the other end of the inner shaft.

[0007] Preferably, the inner shafts are provided in two groups, and the inner shaft plug holes are opened on one end surface of the two groups of inner shafts close to each other.

[0008] Preferably, the outer shaft has a cylindrical structure, and a cavity is provided inside the outer shaft. The inner shaft insertion hole communicates with the cavity of the outer shaft. One end of the inner shaft extending into the inner shaft insertion hole is movably inserted into the cavity of the outer shaft. A spring plate is slidably connected in the cavity of the outer shaft. One end of the spring plate is fixed to the inner shaft, and a spring is fixed to the other end of the spring plate. The other end of the spring is fixed to the inner wall of the cavity of the outer shaft.

[0009] Preferably, a pull rod hole is provided on the surface of one end of the outer shaft away from the inner shaft insertion hole. The pull rod hole communicates with the cavity of the outer shaft. A pull rod is movably inserted into the pull rod hole. One end of the pull rod extending into the pull rod hole is fixed to the surface of the spring plate away from the inner shaft. A handle is fixed to the end of the pull rod extending out of the pull rod hole, and a finger groove is provided on the surface of the handle.

[0010] Preferably, a key is fixed to the hole wall of the inner shaft insertion hole, and a key groove is provided on the shaft body of the inner shaft. The key is slidably connected in the inner shaft.

[0011] Preferably, a bearing outer ring and a bearing inner ring are provided between the inner ring of the sleeve and the outer shaft. Both the bearing outer ring and the bearing inner ring are of an annular structure. An interference fit is provided between the outer ring of the bearing outer ring and the inner ring of the sleeve, and an interference fit is provided between the inner ring of the bearing inner ring and the surface of the shaft body of the outer shaft.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] For the wear resistance detection mechanism of precision plastic parts proposed by the present utility model, the core shaft in the prior art is changed to an outer shaft. The outer shaft is rotatably connected in the sleeve provided at the top of the connecting rod. Inner shaft insertion holes are provided at one end of the two outer shafts close to each other, and inner shafts are movably inserted into the inner shaft insertion holes. The clamping wheels are arranged on the surface of one end of the inner shaft extending out of the inner shaft insertion hole. The length of the inner shaft extending out of the inner shaft insertion hole is variable, so that the distance between the two clamping wheels is variable, realizing the function that the wear resistance detection mechanism of the precision plastic parts can detect the wear resistance of various precision plastic parts with different sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural diagram of the present utility model;

[0015] Figure 2 is a schematic sectional structural diagram of the present utility model;

[0016] Figure 3 is Figure 2 an enlarged schematic diagram of the structure at A in

[0017] Figure 4 is Figure 2 an enlarged schematic diagram of the structure at B in

[0018] In the figure: connecting rod 1, sleeve 2, outer bearing ring 3, inner bearing ring 4, outer shaft 5, inner shaft insertion hole 6, key 7, inner shaft 8, keyway 9, clamping wheel 10, spring plate 11, spring 12, pull rod hole 13, pull rod 14, handle 15, finger groove 16. Specific embodiments

[0019] In order to clearly and completely describe the purpose and technical solutions of the present utility model and make the advantages more clearly understood, the following further details the embodiments of the present utility model with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present utility model, rather than all of the embodiments, and are only used to explain the embodiments of the present utility model, not to limit the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present utility model.

[0020] Embodiment 1: Please refer to Figures 1 to 4 , the present utility model provides a technical solution: a wear resistance detection mechanism for precision plastic parts, including: a connecting rod 1 and a clamping wheel 10. There are two sets of both the connecting rod 1 and the clamping wheel 10. A sleeve 2 is provided at the top of the connecting rod 1. The sleeve 2 has an annular cylinder structure. An outer shaft 5 is rotatably connected in the inner ring of the sleeve 2. One end of the outer shaft 5 is provided with an inner shaft insertion hole 6. One end of an inner shaft 8 is movably inserted into the inner shaft insertion hole 6. The clamping wheel 10 is provided at the other end of the inner shaft 8. There are two sets of inner shafts 8. The inner shaft insertion hole 6 is opened on the surface of the two inner shafts 8 close to each other.

[0021] The wear resistance detection mechanism for precision plastic parts changes the core shaft in the prior art to an outer shaft 5. The outer shaft 5 is rotatably connected in the sleeve 2 provided at the top of the connecting rod 1. An inner shaft insertion hole 6 is opened at one end of the two outer shafts 5 close to each other. The inner shaft 8 is movably inserted into the inner shaft insertion hole 6. The clamping wheel 10 is provided on the surface of the end of the inner shaft 8 extending out of the inner shaft insertion hole 6. The length of the inner shaft 8 extending out of the inner shaft insertion hole 6 is variable, so that the distance between the two clamping wheels 10 is variable, realizing the function that the wear resistance detection mechanism for precision plastic parts can detect the wear resistance of various precision plastic parts with different sizes.

[0022] Embodiment 2: On the basis of Embodiment 1, in order to adjust the length of the inner shaft 8 extending out of the inner shaft insertion hole 6, the outer shaft 5 is of a cylindrical structure, and a cavity is provided inside the outer shaft 5. The inner shaft insertion hole 6 communicates with the cavity of the outer shaft 5. One end of the inner shaft 8 extending into the inner shaft insertion hole 6 is movably inserted into the cavity of the outer shaft 5. A spring plate 11 is slidably connected in the cavity of the outer shaft 5. One end of the spring plate 11 is fixed to the inner shaft 8, and a spring 12 is fixed to the other end of the spring plate 11. The other end of the spring 12 is fixed to the inner wall of the cavity of the outer shaft 5. A pull rod hole 13 is provided on the surface of the end of the outer shaft 5 away from the inner shaft insertion hole 6. The pull rod hole 13 communicates with the cavity of the outer shaft 5. A pull rod 14 is movably inserted into the pull rod hole 13. One end of the pull rod 14 extending into the pull rod hole 13 is fixed to the surface of the end of the spring plate 11 away from the inner shaft 8. A handle 15 is fixed to the end of the pull rod 14 extending out of the pull rod hole 13. A finger groove 16 is provided on the surface of the handle 15.

[0023] When it is necessary to increase the distance between the two sets of clamping wheels 10, both hands are simultaneously inserted into the finger grooves 16 on the surfaces of the two handles 15, and then the two handles 15 are pulled in the direction away from each other. The handle 15 drives the pull rod 14 to extend a longer distance from the pull rod hole 13. The pull rod 14 drives the spring plate 11 to move in the same direction. On the one hand, the movement of the spring plate 11 compresses the spring 12, and on the other hand, it drives the inner shaft 8 to move in the same direction, so that the distance of the inner shaft 8 extending out of the inner shaft insertion hole 6 becomes shorter. The inner shaft 8 drives the clamping wheels 10 to move in the same direction, so that the distance between the two sets of clamping wheels 10 becomes longer; when it is necessary to reduce the distance between the two sets of clamping wheels 10, only the handle 15 needs to be slowly released. The compressed spring 12 pushes the spring plate 11 in the direction close to the inner shaft insertion hole 6 under its own elastic action, so that the distance of the inner shaft 8 extending out of the inner shaft insertion hole 6 becomes longer. The inner shaft 8 pushes the clamping wheels 10 to move in the same direction, so that the distance between the two sets of clamping wheels 10 becomes shorter.

[0024] Embodiment 3: On the basis of Embodiment 2, in order to prevent the spring 12 from being twisted when the clamping wheel 10 rotates, a key 7 is fixed on the hole wall of the inner shaft insertion hole 6, and a key groove 9 is provided on the shaft body of the inner shaft 8. The key 7 is slidably connected in the inner shaft 8.

[0025] A key 7 is fixed on the hole wall of the inner shaft insertion hole 6, and a key groove 9 is provided on the shaft body of the inner shaft 8. The key 7 is slidably connected in the inner shaft 8. When the clamping wheel 10 rotates, the clamping wheel 10 drives the inner shaft 8 to rotate. The inner shaft 8 drives the outer shaft 5 to rotate synchronously through the key 7 and the key groove 9. The rotation of the inner shaft 8 drives the spring plate 11 to rotate. Then the rotation speeds of both ends of the spring 12 are the same, so that it can be avoided that the spring 12 is twisted when the clamping wheel 10 rotates; at the same time, the length of the key groove 9 provided on the shaft body of the inner shaft 8 is longer, and the key 7 can be slidably connected in the key groove 9, so that the key 7 does not limit the length of the inner shaft 8 extending out of the inner shaft insertion hole 6.

[0026] Example 4: On the basis of Example 3, in order to reduce the wear between the sleeve 2 and the outer shaft 5, a bearing outer ring 3 and a bearing inner ring 4 are provided between the inner ring of the sleeve 2 and the outer shaft 5. Both the bearing outer ring 3 and the bearing inner ring 4 are of an annular structure. There is an interference fit between the outer ring of the bearing outer ring 3 and the inner ring of the sleeve 2, and there is an interference fit between the inner ring of the bearing inner ring 4 and the shaft surface of the outer shaft 5.

[0027] A bearing outer ring 3 and a bearing inner ring 4 are provided between the sleeve 2 and the outer shaft 5 to prevent the outer shaft 5 from rubbing against the sleeve 2 when it rotates, thereby reducing the wear of the sleeve 2 and the outer shaft 5.

[0028] In actual use, the wear resistance testing mechanism of this precision plastic part changes the mandrel in the prior art to an outer shaft 5. The outer shaft 5 is rotatably connected to a sleeve 2 provided at the top of a connecting rod 1. Inner shaft insertion holes 6 are provided at one end of the two outer shafts 5 close to each other. An inner shaft 8 is movably inserted into the inner shaft insertion holes 6. A clamping wheel 10 is arranged on the surface of one end of the inner shaft 8 extending out of the inner shaft insertion holes 6. The length of the inner shaft 8 extending out of the inner shaft insertion holes 6 is variable, so that the distance between the two clamping wheels 10 is variable, realizing the function that the wear resistance testing mechanism of this precision plastic part can perform wear resistance testing on precision plastic parts of various different sizes; when the distance between the two clamping wheels 10 needs to be increased, both hands are simultaneously inserted into the finger grooves 16 on the surfaces of the two handles 15, and then the two handles 15 are pulled in the direction away from each other. The handle 15 drives the pull rod 14 to extend a longer distance from the pull rod hole 13. The pull rod 14 drives the spring plate 11 to move in the same direction. On the one hand, the movement of the spring plate 11 compresses the spring 12, and on the other hand, it drives the inner shaft 8 to move in the same direction, making the distance that the inner shaft 8 extends out of the inner shaft insertion holes 6 shorter. The inner shaft 8 drives the clamping wheel 10 to move in the same direction, so that the distance between the two clamping wheels 10 becomes longer; when the distance between the two clamping wheels 10 needs to be reduced, only need to slowly release the handle 15. The compressed spring 12 pushes the spring plate 11 in the direction close to the inner shaft insertion holes 6 under its own elastic force, making the distance that the inner shaft 8 extends out of the inner shaft insertion holes 6 longer. The inner shaft 8 pushes the clamping wheel 10 to move in the same direction, so that the distance between the two clamping wheels 10 becomes shorter; a key 7 is fixed on the hole wall of the inner shaft insertion hole 6, and a key groove 9 is provided on the shaft body of the inner shaft 8. The key 7 is slidably connected in the inner shaft 8. When the clamping wheel 10 rotates, the clamping wheel 10 drives the inner shaft 8 to rotate. The inner shaft 8 drives the outer shaft 5 to rotate synchronously through the key 7 and the key groove 9. The rotation of the inner shaft 8 drives the spring plate 11 to rotate. Then the rotation speeds of both ends of the spring 12 are the same, so that the spring 12 can be prevented from being twisted when the clamping wheel 10 rotates; at the same time, the length of the key groove 9 provided on the shaft body of the inner shaft 8 is longer, and the key 7 can be slidably connected in the key groove 9, so that the key 7 does not limit the length of the inner shaft 8 extending out of the inner shaft insertion holes 6; a bearing outer ring 3 and a bearing inner ring 4 are arranged between the sleeve 2 and the outer shaft 5 to prevent friction between the outer shaft 5 and the sleeve 2 when the outer shaft 5 rotates, thereby reducing the wear of the sleeve 2 and the outer shaft 5.

[0029] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wear resistance detection mechanism for precision plastic parts, comprising: Connecting rod (1) and clamping wheel (10), there are two sets of connecting rod (1) and clamping wheel (10). A sleeve (2) is provided at the top of the connecting rod (1). The sleeve (2) has a ring-shaped cylinder structure. It is characterized in that: an outer shaft (5) is rotatably connected in the inner ring of the sleeve (2). One end of the outer shaft (5) is provided with an inner shaft insertion hole (6). One end of the inner shaft (8) is movably inserted into the inner shaft insertion hole (6). The clamping wheel (10) is provided at the other end of the inner shaft (8).

2. The wear resistance detection mechanism of a precision plastic part according to claim 1, characterized in that: There are two sets of the inner shafts (8). The inner shaft insertion holes (6) are opened on the surfaces of the two inner shafts (8) close to each other.

3. The wear resistance detection mechanism for a precision plastic part according to claim 1, characterized in that: The outer shaft (5) has a cylinder structure. A cavity is opened inside the outer shaft (5). The inner shaft insertion hole (6) communicates with the cavity of the outer shaft (5). One end of the inner shaft (8) extending into the inner shaft insertion hole (6) is movably inserted into the cavity of the outer shaft (5). A spring plate (11) is slidably connected in the cavity of the outer shaft (5). One end of the spring plate (11) is fixed to the inner shaft (8). A spring (12) is fixed to the other end of the spring plate (11). The other end of the spring (12) is fixed to the inner wall of the cavity of the outer shaft (5).

4. The wear resistance detection mechanism for a precision plastic part according to claim 3, characterized in that: A pull rod hole (13) is opened on the surface of the outer shaft (5) far from the inner shaft insertion hole (6). The pull rod hole (13) communicates with the cavity of the outer shaft (5). A pull rod (14) is movably inserted into the pull rod hole (13). One end of the pull rod (14) extending into the pull rod hole (13) is fixed to the surface of the spring plate (11) far from the inner shaft (8). A handle (15) is fixed to the end of the pull rod (14) extending out of the pull rod hole (13). A finger groove (16) is opened on the surface of the handle (15).

5. The wear resistance detection mechanism for a precision plastic part according to claim 1, characterized in that: A key (7) is fixed on the hole wall of the inner shaft insertion hole (6). A key groove (9) is opened on the shaft body of the inner shaft (8). The key (7) is slidably connected in the inner shaft (8).

6. The wear resistance detection mechanism for a precision plastic part according to claim 5, characterized in that: A bearing outer ring (3) and a bearing inner ring (4) are provided between the inner ring of the sleeve (2) and the outer shaft (5). Both the bearing outer ring (3) and the bearing inner ring (4) have a ring structure. There is an interference fit between the outer ring of the bearing outer ring (3) and the inner ring of the sleeve (2). There is an interference fit between the inner ring of the bearing inner ring (4) and the surface of the shaft body of the outer shaft (5).

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