Concentric wire harness and concentricity detection system thereof

Abstract

The invention discloses a concentric wire harness and a concentricity detection system of the concentric wire harness. The detection system comprises a lens; a light-transmitting support is fixedly arranged in front of the lens, a light-transmitting hole coaxial with the lens penetrates through the light-transmitting support, an annular light supplementing lamp is coaxially and fixedly installed on the side, away from the lens, of the light-transmitting hole, a wire harness guiding device is arranged on the side, away from the lens, of the annular light supplementing lamp, and the wire harness guiding device can guide a detected wire harness in the axis direction of the lens barrel. The end, close to the annular light supplementing lamp, of the wire harness guider is provided with a wire harness end restraining unit, the end restraining unit can position the end of the detected wire harness, and the outer contour of the wire harness end of the detected wire harness is restrained to be coaxial with the axis of the lens. And the lens can completely shoot the wire harness end part of the detected wire harness in a centered manner.

Description

Technical Field

[0001] The invention belongs to the field of wire harness detection. Background Art

[0002] The concentricity detection process for the concentric wire harness is to use a CCD visual camera to shoot the end of the concentric wire harness along the axis direction to obtain the end pattern of the wire harness, such as Figure 2 As shown, the concentricity between the wire core and the outer contour of the wire harness is determined based on the obtained pattern, and it is determined to be qualified if the concentricity requirement is met.

[0003] The best shooting angle of the CCD vision camera should be that the axis of the lens of the vision camera is exactly coaxial with the axis of the circular outer contour of the end of the measured harness, such as Figure 1 As shown, the pattern obtained at this viewing angle is the best centered vertical shooting angle, thereby avoiding the error of oblique shooting, while the existing concentricity visual inspection does not strictly restrict this shooting angle. Summary of the invention

[0004] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a concentric wire harness and a concentricity detection system for the concentric wire harness, which can enable the lens to completely center the end of the wire harness to be tested in the final shooting stage.

[0005] Technical solution: To achieve the above-mentioned purpose, a concentricity detection system of a concentric wire harness of the present invention comprises a lens; a light-through bracket is fixedly arranged in front of the lens, a light-through hole coaxial with the lens is penetrated on the light-through bracket, a ring-shaped fill light is coaxially fixedly installed on the side of the light-through hole away from the lens, and a ring-shaped light-fill light has a ring-shaped light-emitting surface on the side away from the lens;

[0006] A harness guide is arranged on the side of the annular fill light away from the lens, and the harness guide can guide the measured harness along the axis direction of the lens barrel. A harness end constraint unit is arranged on the end of the harness guide close to the annular fill light, and the end constraint unit can position the end of the measured harness and constrain the outer contour of the harness end of the measured harness to be coaxial with the axis of the lens.

[0007] Furthermore, the wire harness guide includes a conical wire harness guide horn, which is fixed by a bracket and has an axis coaxial with the lens, and a horn-shaped guide opening of the wire harness guide horn is located on a side away from the annular fill light.

[0008] Furthermore, the thin end of the wire harness guiding horn is fixedly connected to a plurality of linear wire harness guiding spring bars extending in a straight line along the axial direction, the plurality of linear wire harness guiding spring bars are distributed in a circular array along the axis of the wire harness guiding horn, and the plurality of linear wire harness guiding spring bars are combined together to form a wire harness guiding tube coaxial with the wire harness guiding horn.

[0009] Furthermore, when the measured wire harness is inserted into the wire harness guide tube along its length, there is a gap between the outer wall surface of the measured wire harness and the wire harness guide tube.

[0010] Furthermore, the linear guide channel in the wire harness guide cylinder is connected to the thin end of the wire harness guide horn; a linear gap is formed between any adjacent linear wire harness guide spring bars on the wire harness guide cylinder; and the wire harness end constraint unit is located at one end of the wire harness guide cylinder away from the wire harness guide horn.

[0011] Furthermore, the harness end restraining unit comprises a plurality of conical lobes distributed in a circumferential array, the roots of the plurality of conical lobes are fixedly connected to the outer wall surfaces of a plurality of linear harness guide spring bars in a one-to-one correspondence; the outer wall surfaces of the plurality of conical lobes are combined together to form a conical surface with the thick end facing the harness guide horn;

[0012] A driving ring is coaxially sleeved on the outer side of the thin end of the conical surface formed by the outer wall surfaces of the plurality of conical petals, and an annular gap is formed between the driving ring and the conical surface in the initial state;

[0013] It also includes a pair of linear expanders parallel to the harness guide tube, the shell of the linear expander is fixedly connected to the harness guide horn through the expander bracket; the linear expander can drive the driving ring to move along the axial direction.

[0014] Furthermore, a section at the end of each linear harness guiding spring bar is recorded as the spring bar end section, and each spring bar end section is located on the side of each conical petal away from the harness guiding horn; the outer wall surface of each spring bar end section is provided with a plurality of transmission teeth distributed in a linear array along the length direction; the transmission teeth on the outer wall surface of each spring bar end section are meshed with a follower gear, and each follower gear is rotatably mounted on a gear support through a bearing, and each gear support is fixedly connected to a driving ring; each follower gear is fixedly connected to a harness end restraint arm bent toward the axis of the harness guiding horn on the side away from the driving ring, and the end of each harness end restraint arm is an end restraint head, and a plurality of end restraint heads are distributed in a circular array; in the initial state, the plurality of end restraint heads distributed in a circular array are all located within the enclosed range of the inner contour of the end of the harness guiding tube.

[0015] Furthermore, the driving ring is displaced along the axial direction gradually approaching the harness guide horn. Under the displacement of the driving ring, each gear support moves with the follower gear following the driving ring. In the process of the follower gear following the displacement of the driving ring, each follower gear rotates along its own axis under the action of meshing, so that the harness end constraint arm connected to each gear swings toward the side gradually deviating from the axis of the harness guide tube, so that several end constraint heads deviate from the enclosed range of the inner contour of the end of the harness guide tube; as the linear retractor drives the driving ring to continue to displace gradually approaching the harness guide horn along the axial direction, until the driving ring deviates along the axial direction to contact and press the conical surface, the outer wall surface of each conical petal is subjected to a component force toward the direction deviating from the axis of the harness guide tube, which is transmitted to each linear harness guide spring bar, so that the end position of each linear harness guide spring bar is subjected to a component force toward the axis of the harness guide tube, so that several linear harness guide spring bars are elastically deformed synchronously, and the ends of several linear harness guide spring bars are brought together to approach each other.

[0016] A concentric wire harness, the cross section of which at least includes a central wire core and an insulating sheath surrounding the central wire core.

[0017] Beneficial effects: The present invention can ensure that the measured wire harness can smoothly pass through the wire harness guide tube with a larger inner diameter along the length direction, and at the final shooting stage, the lens can be completely centered to shoot the wire harness end of the measured wire harness. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the state of the best shooting angle when the lens axis of the visual camera is just coaxial with the axis of the circular outer contour of the end of the measured harness;

[0019] Figure 2 Schematic diagram of the pattern captured by the visual camera;

[0020] Figure 3 It is a schematic diagram of the focusing structure of the visual camera along the axis direction;

[0021] Figure 4 for Figure 3 Schematic diagram from another angle;

[0022] Figure 5 This is a schematic diagram of the overall structure of this scheme;

[0023] Figure 6 It is a side view of the wire harness guide;

[0024] Figure 7 is a stereoscopic view of a wire harness guide;

[0025] Figure 8 It is a cross-sectional view of the wire harness guide;

[0026] Fig. 9 This is the disassembled diagram of the wire harness guide. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] As attached Figures 1 to 9 A concentricity detection system for a concentric wire harness is shown, such as Figure 3 , 4 As shown, it includes a camera focus base 7 in a darkroom, a focus rail 5 is fixedly installed on the camera focus base 7, a focus slider 4 is matched with the focus slider 5, and under the drive of the driving device, the focus slider 4 moves linearly along the focus rail 5; a CCD visual camera 3 is fixedly installed on the focus slider 4 through a support 3, a lens barrel 2 extending along the length direction of the focus rail 5 is installed at the front end of the CCD visual camera 3, and a lens 8 is at the end of the lens barrel 2; a light-transmitting bracket 1 is fixedly arranged in front of the lens 8, and a light-transmitting hole 9 coaxial with the lens 8 is penetrated on the light-transmitting bracket 1, and the light-transmitting hole 9 is far away An annular fill light 10 is coaxially fixedly installed on one side away from the lens 8, and an annular light-emitting surface 10.1 is provided on the side of the annular fill light 10 away from the lens 8; a harness guide 80 is provided on the side of the annular fill light 10 away from the lens 8, and the harness guide 80 can guide the measured harness 12 along the axial direction of the lens barrel 2; a harness end constraint unit 11 is provided on one end of the harness guide 80 close to the annular fill light 10, and the end constraint unit 11 can position the end of the measured harness 12 and constrain the outer contour of the harness end 12a of the measured harness 12 to be coaxial with the axis of the lens 8.

[0029] like Figures 4 to 9 As shown, the wire guide 80 includes a conical wire guide horn 13 , which is fixed by a bracket and has an axis coaxial with the lens 8 , and a horn-shaped guide opening of the wire guide horn 13 is located on a side away from the annular fill light 10 .

[0030] The thin end of the harness guide horn 13 is fixedly connected with a plurality of straight harness guide spring bars 14a extending in a straight line along the axial direction, and the plurality of straight harness guide spring bars 14a are distributed in a circumferential array along the axis of the harness guide horn 13, and the plurality of straight harness guide spring bars 14a are combined together to form a harness guide cylinder 14 coaxial with the harness guide horn 13; in order to enable the measured harness 12 to smoothly pass through the harness guide cylinder 14, the following size restrictions are made: when the measured harness 12 penetrates into the harness guide cylinder 14 along the length, there is a gap 102 between the outer wall surface of the measured harness 12 and the harness guide cylinder 14;

[0031] The linear guide channel in the harness guide tube 14 is connected to the thin end of the harness guide horn 13; a linear gap 15 is formed between any adjacent linear harness guide spring bars 14a on the harness guide tube 14; the harness end restraint unit 11 is at one end of the harness guide tube 14 away from the harness guide horn 13.

[0032] The harness end restraint unit 11 includes a plurality of conical petals 17 distributed in a circular array, the roots of the plurality of conical petals 17 are fixedly connected to the outer wall surfaces of a plurality of linear harness guiding spring bars 14a one by one; the outer wall surfaces of the plurality of conical petals 17 are combined together to form a conical surface 17a with the thick end facing the harness guiding horn 13; the outer coaxial sleeve of the thin end of the conical surface 17a formed by the outer wall surfaces of the plurality of conical petals 17 is provided with a driving ring 21, and an annular gap 110 is formed between the driving ring 21 and the conical surface 17a in the initial state; it also includes a pair of linear expanders 19 parallel to the harness guiding tube 14, the shell of the linear expander 19 is fixedly connected to the harness guiding horn 13 through the expander bracket 16; the linear expander 19 can drive the driving ring 21 to move along the axial direction.

[0033] A section at the end of each linear harness guiding spring bar 14a is recorded as the spring bar end section 14aa, and each spring bar end section 14aa is located on the side of each conical petal 17 away from the harness guiding horn 13; the outer wall surface of each spring bar end section 14aa is provided with a plurality of transmission teeth 18 distributed in a linear array along the length direction; the transmission teeth 18 on the outer wall surface of each spring bar end section 14aa are meshed with a follower gear 23, and each follower gear 23 is rotatably mounted on a gear support 22 through a bearing, and each gear support 22 is fixedly connected to a driving ring 21; each follower gear 23 is fixedly connected to a harness end restraint arm 24 bent toward the axis of the harness guiding horn 13 on the side away from the driving ring 21, and the end of each harness end restraint arm 24 is an end restraint head 25, and a plurality of end restraint heads 25 are distributed in a circular array; Figure 6 and 7 In the initial state, the plurality of terminal restraining heads 25 distributed in a circular array are all located within the enclosed range of the inner contour of the end of the harness guide tube 14 .

[0034] The cross section of the measured wire harness 12 of the present solution at least includes a central wire core and an insulating skin surrounding the central wire core.

[0035] Working principle and working method: Step 1, in the initial state, an annular gap 110 is formed between the driving ring 21 and the conical surface 17a; each linear harness guide spring bar 14a is spontaneously in a straight line shape;

[0036] Step 2: insert a measured wire harness 12 into the wire harness guide horn 13 along the approximate axial direction of the wire harness guide horn 13, and the end of the measured wire harness 12 is inserted into the wire harness guide tube 14 under the guidance of the inner cone surface of the wire harness guide horn 13. When the measured wire harness 12 is inserted into the wire harness guide tube 14, there is a gap 102 between the outer wall surface of the measured wire harness 12 and the wire harness guide tube 14, and the gap is between 0.5 mm and 1 mm. Therefore, the measured wire harness 12 can smoothly pass through the wire harness guide tube 14 with a larger inner diameter along the length direction, and then continue to push the measured wire harness 12 along the axial direction of the wire harness guide tube 14 until the end of the measured wire harness 12 When the end restraint heads 12a contact the plurality of end restraint heads 25, the measured wire harness 12 cannot continue to be advanced in the axial direction under the joint restraint of the plurality of end restraint heads 25; thereby the axial direction positioning of the measured wire harness 12 is achieved; at this time, the plurality of end restraint heads 25 block the sight line of the lens 8, so that the lens 8 cannot capture the complete end surface pattern of the wire harness end 12a of the measured wire harness 12, and because there is a gap 102 between the outer wall surface of the measured wire harness 12 and the wire harness guide cylinder 14, the measured wire harness 12 and the wire harness guide cylinder 14 are not completely coaxial, so at this time, the axis of the outer contour of the wire harness end 12a of the measured wire harness 12 does not completely coincide with the axis of the lens 8;

[0037] Step three, the linear retractor 19 drives the driving ring 21 to move gradually closer to the harness guide horn 13 along the axial direction. Under the displacement of the driving ring 21, each gear support 22 moves with the follower gear 23 following the driving ring 21. During the process of the follower gear 23 following the displacement of the driving ring 21, each follower gear 23 rotates along its own axis under the action of meshing, so that the harness end restraint arm 24 connected to each gear 23 swings toward the side gradually deviating from the axis of the harness guide tube 14, so that a plurality of end restraint heads 25 are deviated from the enclosed range of the inner contour of the end of the harness guide tube 14. At this time, the lens 8 can capture the complete end face pattern of the harness end 12a of the measured harness 12, but the axis of the outer contour of the harness end 12a of the measured harness 12 does not completely coincide with the axis of the lens 8.

[0038] As the linear retractor 19 drives the driving ring 21 to continue to move gradually closer to the harness guide horn 13 along the axial direction, until the driving ring 21 deviates along the axial direction to contact and press the conical surface 17a, the outer wall surface of each conical petal 17 is subjected to a component force that deviates from the axial direction of the harness guide tube 14 and is transmitted to each linear harness guide spring bar 14a, so that the end position of each linear harness guide spring bar 14a is subjected to a component force that is directed toward the axial direction of the harness guide tube 14, so that the plurality of linear harness guide spring bars 14a are elastically deformed synchronously, so that the plurality of linear harness guide spring bars 14a are The ends of the spring bars 14a move toward each other and gather together, so that the outer contour axis center of the end portion 12a of the measured wire harness 12 coincides with the axis of the lens 8 under the common gathering constraint of the ends of the plurality of linear wire harness guiding spring bars 14a. At this time, since the elastic deformation of the plurality of linear wire harness guiding spring bars 14a is relatively small, the maximum deformation displacement is only between 0.5 mm and 1 mm, and the offset between the transmission tooth body 18 on the outer wall surface of each elastic bar end segment 14aa and the corresponding follower gear 23 is not sufficient to change the meshing relationship between them.

[0039] Then, the lens 8 is completely centered to photograph the harness end 12a of the tested harness 12; at this time, in the pattern photographed by the lens 8, if the wire core of the harness end 12a of the tested harness 12 is not on the center of the circular outer contour of the harness end 12a, then the concentricity test of the harness is judged to be unqualified, otherwise it is qualified.

[0040] In step four, the linear retractor 19 drives the driving ring 21 to move gradually away from the harness guide horn 13 along the axial direction until the initial state in "step one". The linear harness guide spring strips 14a on the harness guide tube 14 and the plurality of end restraint heads 25 automatically return to the linear state in the initial state. At this time, the measured harness 12 is released, and the measured harness 12 can be taken out by pulling back the measured harness 12.

[0041] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A concentricity detection system for a concentric wire harness, characterized in that: It comprises a lens (8); a light-through bracket (1) is fixedly arranged in front of the lens (8); a light-through hole (9) coaxial with the lens (8) is penetrated through the light-through bracket (1); a ring-shaped fill light (10) is coaxially fixedly installed on a side of the light-through hole (9) away from the lens (8); A wire harness guide (80) is provided on the side of the annular fill light (10) away from the lens (8), and the wire harness guide (80) can guide the measured wire harness (12) along the axial direction of the lens barrel (2). A wire harness end restraint unit (11) is provided on the end of the wire harness guide (80) close to the annular fill light (10), and the end restraint unit (11) can position the end of the measured wire harness (12) and restrain the outer contour of the wire harness end (12a) of the measured wire harness (12) to be coaxial with the axis of the lens (8).

2. The concentricity detection system of a concentric wire harness according to claim 1, characterized in that: The wire harness guide (80) comprises a conical wire harness guide horn (13), the wire harness guide horn (13) being fixed by a bracket and having an axis coaxial with the lens (8), and a horn-shaped guide opening of the wire harness guide horn (13) being located on a side away from the annular fill light (10).

3. The concentricity detection system of a concentric wire harness according to claim 2, characterized in that: The thin end of the wire harness guiding horn (13) is fixedly connected to a plurality of linear wire harness guiding elastic strips (14a) extending linearly along the axial direction; the plurality of linear wire harness guiding elastic strips (14a) are distributed in a circular array along the axis of the wire harness guiding horn (13); the plurality of linear wire harness guiding elastic strips (14a) are combined together to form a wire harness guiding tube (14) coaxial with the wire harness guiding horn (13).

4. The concentricity detection system of a concentric wire harness according to claim 3, characterized in that: When the measured wire harness (12) is inserted into the wire harness guide tube (14) along its length, a gap (102) exists between the outer wall surface of the measured wire harness (12) and the wire harness guide tube (14).

5. The concentricity detection system of a concentric wire harness according to claim 4, characterized in that: A linear guide channel in the wire harness guide tube (14) is connected to the thin end of the wire harness guide horn (13); a linear gap (15) is formed between any adjacent linear wire harness guide spring strips (14a) on the wire harness guide tube (14); and the wire harness end restraint unit (11) is located at one end of the wire harness guide tube (14) away from the wire harness guide horn (13).

6. The concentricity detection system of a concentric wire harness according to claim 5, characterized in that: The harness end restraining unit (11) comprises a plurality of conical lobes (17) distributed in a circumferential array, the roots of the plurality of conical lobes (17) being fixedly connected to the outer wall surfaces of a plurality of linear harness guiding spring bars (14a) in a one-to-one correspondence; the outer wall surfaces of the plurality of conical lobes (17) are combined together to form a conical surface (17a) with a thick end facing the harness guiding horn (13); a driving ring (21) is coaxially sleeved on the outer thin end of the conical surface (17a) formed by the outer wall surfaces of the plurality of conical lobes (17); an annular gap (110) is formed between the driving ring (21) and the conical surface (17a) in an initial state; and the linear retractor (19) can drive the driving ring (21) to move along the axial direction.

7. The concentricity detection system of a concentric wire harness according to claim 6, characterized in that: A section at the end of each linear wire harness guiding spring bar (14a) is recorded as a spring bar end section (14aa), and each of the spring bar end sections (14aa) is located on a side of each cone lobe (17) away from the wire harness guiding horn (13); a plurality of transmission tooth bodies (18) are distributed in a linear array along the length direction on the outer wall surface of each of the spring bar end sections (14aa); the transmission tooth bodies (18) on the outer wall surface of each spring bar end section (14aa) are meshed with a follower gear (23), and each of the follower gears (23) is rotatably mounted on a gear support (22) via a bearing. ), each gear support (22) is fixedly connected to the driving ring (21); each follower gear (23) is fixedly connected to a wire harness end restraint arm (24) bent toward the axis of the wire harness guide horn (13) on the side away from the driving ring (21); the end of each wire harness end restraint arm (24) is an end restraint head (25), and a plurality of end restraint heads (25) are distributed in a circular array; in an initial state, the plurality of end restraint heads (25) distributed in a circular array are all located within the enclosed range of the inner contour of the end of the wire harness guide tube (14).

8. The concentricity detection system of a concentric wire harness according to claim 7, characterized in that: The driving ring (21) is displaced along the axis direction gradually approaching the wire harness guide horn (13). Under the displacement of the driving ring (21), each gear support (22) brings the follower gear (23) to translate along the driving ring (21). During the displacement of each follower gear (23) along the driving ring (21), each follower gear (23) rotates along its own axis under the action of meshing, so that the wire harness end restraining arm (24) connected to each gear (23) swings toward a side gradually deviating from the axis of the wire harness guide tube (14), so that a plurality of end restraining heads (25) are all deviated from the enclosed range of the inner contour of the end of the wire harness guide tube (14); as the linear retractor (19) is brought The driving ring (21) is moved to continue to move gradually closer to the harness guide horn (13) along the axial direction until the driving ring (21) is offset along the axial direction to contact and press the conical surface (17a), so that the outer wall surface of each conical surface petal (17) is subjected to a component force in the direction of the axis deviating from the harness guide tube (14), which is transmitted to each linear harness guide spring bar (14a), so that the end position of each linear harness guide spring bar (14a) is subjected to a component force in the direction of the axis of the harness guide tube (14), so that the plurality of linear harness guide spring bars (14a) are elastically deformed synchronously, and the ends of the plurality of linear harness guide spring bars (14a) are brought together to move closer to each other.

9. A concentric wire harness, characterized in that: The cross section of the measured wire harness (12) at least includes a central wire core and an insulating sheath surrounding the central wire core.

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