Elbow wire harness assembly process system and elbow wire harness thereof

Abstract

The invention discloses an elbow wire harness assembly process system and an elbow wire harness thereof, the elbow wire harness assembly process system comprises a wire harness, one end of the wire harness is an elbow terminal inner core, and a terminal insulation shell and a fixed rear cover are arranged outside the elbow terminal inner core; the elbow terminal inner core comprises an elbow section a and an elbow section b which are vertically connected, the elbow section b is consistent with the extension direction of a wire harness and is connected with the tail end of the wire harness, the terminal insulating shell comprises an insulating cylinder and a rectangular insulating shell which are integrally and vertically communicated and connected, and the tail end of the rectangular insulating shell and one side far away from the insulating cylinder are provided with openings; a rectangular clamping groove is formed in the rectangular insulating shell; the insulating cylinder body is sleeved outside the elbow section a; the elbow b section is clamped in a rectangular clamping groove in the rectangular insulating shell along the length direction; according to the invention, the cooperation of the clamping body and the hard arc-shaped sheet can effectively protect the connection part of the wire harness and the inner core of the elbow terminal.

Description

Technical Field

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

[0002] The connection between the end of the automotive wiring harness and the harness elbow is a relatively weak part of the harness. In order to achieve a stable connection between the harness terminal and the harness end, the harness terminal crimping process is generally used to crimp the metal parts into a ring shape and tightly clamp them at the end of the harness, so as to achieve a stable connection. The existing crimping and clamping method at the connection between the terminal and the harness has certain disadvantages, such as Figure 7 As shown, firstly, there is a problem that the clamping cannot be closed during the crimping and clamping process, and secondly, the wire harness end is punctured due to excessive crimping during the clamping process. Summary of the invention

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides an elbow wire harness assembly process system and an elbow wire harness thereof. The combination of the clamping body and the hard arc-shaped sheet of the present invention can effectively protect the connection between the wire harness and the inner core of the elbow terminal.

[0004] Technical solution: To achieve the above purpose, an elbow wiring harness of the present invention includes a wiring harness, one end of the wiring harness is an elbow terminal inner core, and a terminal insulating shell and a fixed rear cover are arranged outside the elbow terminal inner core;

[0005] The inner core of the elbow terminal includes an elbow section a and an elbow section b which are vertically connected. The elbow section b is consistent with the extension direction of the wire harness and is connected to the end of the wire harness. The terminal insulating shell includes an insulating cylinder and a rectangular insulating shell which are integrally and vertically connected. The tail end and the side away from the insulating cylinder of the rectangular insulating shell are both provided with open openings, so that a rectangular slot is formed in the rectangular insulating shell; the insulating cylinder is sleeved outside the elbow section a; the elbow section b is clamped in the rectangular slot in the rectangular insulating shell along the length direction.

[0006] Furthermore, a hard arc-shaped piece extending along the length direction of the wiring harness is fixedly connected to the tail end of the rectangular insulating shell close to the insulating cylinder, and the concave arc surface of the hard arc-shaped piece fits the outer arc surface of the wiring harness.

[0007] Furthermore, after the elbow section b is mounted in the rectangular slot, a rear cover slot is formed on the side of the elbow section b away from the elbow section a in the rectangular slot.

[0008] Furthermore, the fixed back cover includes a rectangular metal back cover, the front part of the rectangular metal back cover is embedded in the back cover slot, and the first clamping piece and the second clamping piece are symmetrically and vertically connected on both sides of the rear part of the rectangular metal back cover. The end of the wiring harness is clamped between the first clamping piece and the second clamping piece, and the free ends of the first clamping piece and the second clamping piece in the assembled state are bent toward the side close to each other and tightly clamp the end of the wiring harness to form a closed-loop clamping body that tightly clamps the end of the wiring harness, and the end joints of the first clamping piece and the second clamping piece of the clamping body are tightly fitted to the outer arc surface of the hard arc piece.

[0009] Furthermore, an assembly process of an elbow wiring harness includes the following steps:

[0010] Step 1, prepare a wire harness with an elbow terminal core, a terminal insulating housing, a fixed rear cover, and a rear cover clamping device;

[0011] Step 2: Put the insulating cylinder outside the elbow section a, and clamp the elbow section b in the rectangular slot in the rectangular insulating shell along the length direction, at this time, the concave arc surface of the hard arc sheet fits the outer arc surface of the wiring harness; in the rectangular slot, the side of the elbow section b away from the elbow section a forms a rear cover slot;

[0012] Step 3: Insert the front part of the rectangular metal back cover into the back cover slot, and clamp the end of the wire harness between the first clamping piece and the second clamping piece; at this point, the inner core of the elbow terminal is completed.

[0013] The initial assembly of the terminal insulation shell and the fixed rear cover, at this time the combined structure of the elbow terminal core, the terminal insulation shell and the fixed rear cover is still a loose structure;

[0014] Step 4: Bend the free ends of the first clamping piece and the second clamping piece toward each other through the rear cover clamping device and tightly clamp the end of the wiring harness to form a closed-loop clamping body that tightly clamps the end of the wiring harness, so that the end joints of the first clamping piece and the second clamping piece of the clamping body are tightly fitted to the outer arc surface of the hard arc piece; thereby obtaining a wiring harness elbow with a stable structure.

[0015] Furthermore, a rear cover clamping device is provided in the assembly process of the elbow wiring harness: the rear cover clamping device comprises a rotating shaft which can be driven by a driving device, a telescope is fixedly installed at the end of the rotating shaft along the length direction, a telescope is provided at the end of the telescope for performing telescopic movement; a connecting arm which extends downward in an initial state is fixed to the lower side of the shell of the telescope, a horizontal slide is vertically fixed to the end of the connecting arm, a cylinder holder is vertically connected to the upper side of the end of the horizontal slide away from the connecting arm, the distance between the cylinder holder and the connecting arm is greater than the outer diameter of the insulating cylinder; an arc-shaped concave bayonet is provided on the side of the cylinder holder close to the connecting arm, and the inner contour of the arc-shaped concave bayonet is adapted to the outer contour of the insulating cylinder; a horizontal limit strip parallel to the telescope is provided above the cylinder holder, and the horizontal limit strip is fixedly connected to the telescope shell through a synchronization arm.

[0016] Furthermore, a b rotating shaft that can be driven by a driving device is arranged on the side of the cylinder seat away from the connecting arm, and the axis of the b rotating shaft is parallel to the axis of the a rotating shaft directly below; a rocker arm is vertically fixedly connected to the end of the b rotating shaft, and a rolling wheel shaft parallel to the b rotating shaft is vertically connected to the end of the rocker arm, and a rolling wheel is rotatably installed outside the rolling wheel shaft through a bearing.

[0017] Furthermore, the assembly structure tooling of the elbow terminal inner core, the terminal insulating shell and the fixed back cover is in the back cover clamping device state: the insulating cylinder faces downward, and the lower end of the insulating cylinder is limited to contact the surface of the horizontal slide table, the side wall of the insulating cylinder fits the inner wall of the arc-shaped concave bayonet of the cylinder holder, the end of the telescopic push rod extends out and presses the rectangular insulating shell away from the front end of the cylinder holder; the lower surface of the horizontal limit strip fits the upper surface of the rectangular metal back cover along the length direction, the axis of the a rotating shaft is coaxial with the axis of the wire harness end, and the b rotating shaft is parallel to the bottom of the wire harness end; the rolling wheel is tangent to the outer side surface at the middle height of the first clamping piece or the second clamping piece;

[0018] When the rolling wheel is just tangent to the outer side surface at the middle height of the second clamping sheet, if the b shaft is rotated counterclockwise, the rolling wheel will be separated from the second clamping sheet, and the continued rotation of the b shaft will drive the rolling wheel to move tangent to the outer side surface at the middle height of the first clamping sheet.

[0019] Beneficial effect: The combination of the clamping body and the hard arc-shaped sheet of the present invention can effectively protect the connection between the wiring harness and the inner core of the elbow terminal, and stably form a closed-loop structure that wraps the end of the wiring harness, preventing the connection between the wiring harness and the inner core of the elbow terminal from being broken under external force. At the same time, the hard arc-shaped sheet has a certain restraining effect on the clamping and bending process of the first clamping sheet and the second clamping sheet, which can effectively prevent the first clamping sheet and the second clamping sheet from piercing the connection between the wiring harness and the inner core of the elbow terminal inward during the bending deformation and clamping process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the wiring harness elbow assembly process;

[0021] Figure 2 It is a schematic diagram of the structure of the rear cover clamping device;

[0022] Figure 3 It is a schematic diagram of placing the insulating cylinder between the cylinder holder and the connecting arm during the tooling process;

[0023] Figure 4 This is a schematic diagram of the completed tooling;

[0024] Figure 5 for Figure 4 Axial view of

[0025] Figure 6 is a schematic diagram of a free end of the second clamping sheet being bent into a bent section of the clamping sheet;

[0026] Figure 7 There are two forms of defects in the existing crimping method. DETAILED DESCRIPTION

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

[0028] As attached Figures 1 to 7 An elbow wiring harness shown includes a wiring harness 13, one end of which is an elbow terminal inner core 5, and a terminal insulating shell 4 and a fixed rear cover 6 are arranged outside the elbow terminal inner core 5; the elbow terminal inner core 5 includes an elbow a section 9 and an elbow b section 8 connected vertically, and the elbow b section 8 is consistent with the extension direction of the wiring harness 13 and connected to the end of the wiring harness 13;

[0029] The terminal insulating housing 4 comprises an insulating cylinder 11 and a rectangular insulating shell 10 which are connected vertically as one body. The tail end of the rectangular insulating shell 10 and the side away from the insulating cylinder 11 are both provided with open openings, so that a rectangular slot 14 is formed in the rectangular insulating shell 10; the insulating cylinder 11 is sleeved outside the elbow a section 9; the elbow b section 8 is clamped in the rectangular slot 14 in the rectangular insulating shell 10 along the length direction; the tail end of the rectangular insulating shell 10 close to the insulating cylinder 11 is fixedly connected with a hard arc-shaped piece 12 extending along the length direction of the wiring harness 13, and the concave arc surface of the hard arc-shaped piece 12 fits the outer arc surface of the wiring harness 13; the hard arc-shaped piece 12 is a thick metal structure or a hard plastic structure that is not easy to deform; Figure 1In step 2, after the elbow b section 8 is clamped in the rectangular slot 14, a rear cover slot 14a is formed on the side of the elbow b section 8 away from the elbow a section 9 in the rectangular slot 14; the fixed rear cover 6 includes a rectangular metal rear cover 7, the front part of the rectangular metal rear cover 7 is embedded in the rear cover slot 14a, and the two sides of the tail of the rectangular metal rear cover 7 are symmetrically and vertically connected with the first clamping piece 1a and the second clamping piece 1b. Both of the first clamping piece 1a and the second clamping piece 1b are metal sheets that are easy to plastically deform. The thickness shown in the accompanying drawings is relatively thick, but it is actually thinner. The end of the wiring harness 13 is clamped between the first clamping piece 1a and the second clamping piece 1b, and the free ends of the first clamping piece 1a and the second clamping piece 1b in the assembled state are bent toward the side close to each other and tightly clamp the end of the wiring harness 13 to form a closed loop. The clamping body 2 tightly clamps the end of the wiring harness 13, and the end joints of the first clamping piece 1a and the second clamping piece 1b of the clamping body 2 are tightly fitted on the outer arc surface of the hard arc piece 12. The cooperation of the clamping body 2 and the hard arc piece 12 can effectively protect the connection between the wiring harness 13 and the inner core 5 of the elbow terminal, and stably form a closed-loop structure that wraps the end of the wiring harness, thereby preventing the connection between the wiring harness 13 and the inner core 5 of the elbow terminal from being broken under external force. At the same time, the hard arc piece 12 has a certain restraining effect on the clamping and bending process of the first clamping piece 1a and the second clamping piece 1b, thereby effectively preventing the ends of the first clamping piece 1a and the second clamping piece 1b from piercing the connection between the wiring harness 13 and the inner core 5 of the elbow terminal inward during the bending deformation and clamping process.

[0030] like Figure 1 The assembly process of the elbow wiring harness shown includes the following steps:

[0031] Step 1, prepare the wire harness 13 with the elbow terminal core 5, the terminal insulating shell 4, the fixed rear cover 6 and the rear cover clamping device 100;

[0032] Step 2: The insulating cylinder 11 is sleeved outside the elbow section a 9, and the elbow section b 8 is clamped in the rectangular slot 14 in the rectangular insulating housing 10 along the length direction. At this time, the concave arc surface of the hard arc-shaped sheet 12 fits the outer arc surface of the wiring harness 13; in the rectangular slot 14, the side of the elbow section b 8 away from the elbow section a 9 forms a rear cover slot 14a;

[0033] Step 3: insert the front part of the rectangular metal back cover 7 into the back cover slot 14a, and clamp the end of the wire harness 13 between the first clamping piece 1a and the second clamping piece 1b; at this time, the elbow terminal core 5 is completed.

[0034] The terminal insulation shell 4 and the fixed rear cover 6 are initially assembled. At this time, the combined structure of the elbow terminal core 5, the terminal insulation shell 4 and the fixed rear cover 6 is still a loose structure;

[0035] Step four, bend the free ends of the first clamping piece 1a and the second clamping piece 1b toward each other through the rear cover clamping device 100 and tightly clamp the end of the wiring harness 13 to form a closed-loop clamping body 2 that tightly clamps the end of the wiring harness 13, so that the end joints of the first clamping piece 1a and the second clamping piece 1b of the clamping body 2 are tightly fitted to the outer arc surface of the hard arc-shaped piece 12, and the hard arc-shaped piece 12 has a certain restraining effect on the clamping and bending process of the first clamping piece 1a and the second clamping piece 1b, which can effectively prevent the first clamping piece 1a and the second clamping piece 1b from piercing the connection between the wiring harness 13 and the inner core 5 of the elbow terminal inward during the bending deformation clamping process; thereby obtaining a wiring harness elbow 3 with stable structure and performance.

[0036] like Figure 2 The rear cover clamping device 100 in the above-mentioned "step four" includes a rotating shaft 20 that can be driven by a driving device, and a telescopic device 21 is fixedly installed at the end of the rotating shaft 20 along the length direction, and a telescopic push rod 23 that can perform telescopic movement is provided at the end of the telescopic device 21; a connecting arm 19 extending downward in an initial state is fixed to the lower side of the shell of the telescopic device 21, and a horizontal slide 18 is vertically fixed to the end of the connecting arm 19, and a cylinder holder 17 is vertically connected to the upper side of one end of the horizontal slide 18 away from the connecting arm 19, and the distance between the cylinder holder 17 and the connecting arm 19 is greater than the outer diameter of the insulating cylinder 11; an arc-shaped concave bayonet 24 is provided on the side of the cylinder holder 17 close to the connecting arm 19, and the inner contour of the arc-shaped concave bayonet 24 is adapted to the outer contour of the insulating cylinder 11.

[0037] A horizontal limit bar 25 parallel to the telescope 21 is arranged above the cylinder holder 17, and the horizontal limit bar 25 is fixedly connected to the telescope 21 shell through a synchronization arm 22; a b rotating shaft 16 that can be driven by a driving device is arranged on the side of the cylinder holder 17 away from the connecting arm 19, and the axis of the b rotating shaft 16 is parallel to and directly below the axis of the a rotating shaft 20; a rocker arm 15 is vertically fixedly connected to the end of the b rotating shaft 16, and a rolling wheel shaft 27 parallel to the b rotating shaft 16 is vertically connected to the end of the rocker arm 15, and a rolling wheel 26 is rotatably installed on the outside of the rolling wheel shaft 27 through a bearing; the axial dimension of the rolling wheel 26 is consistent with the width dimension of the first clamping piece 1a and the second clamping piece 1b.

[0038] The assembly structure tooling of the elbow terminal inner core 5, the terminal insulating shell 4 and the fixed back cover 6 is in the state of the back cover clamping device 100: the insulating cylinder 11 faces downward, and the lower end of the insulating cylinder 11 is limited to contact the surface of the horizontal slide 18, the side wall of the insulating cylinder 11 fits the inner wall of the arc-shaped concave bayonet 24 of the cylinder holder 17, the end of the telescopic push rod 23 extends out and presses the rectangular insulating shell 10 away from the front end of the cylinder holder 17; the lower surface of the horizontal limit strip 25 fits the upper surface of the rectangular metal back cover 7 along the length direction, and the a rotating shaft 2 The axis of 0 is coaxial with the axis of the end of the wiring harness 13, and the b shaft 16 is parallel to the bottom of the end of the wiring harness 13; the rolling wheel 26 is tangent to the outer side surface at the middle height of the first clamping piece 1a or the second clamping piece 1b; when the rolling wheel 26 is just tangent to the outer side surface at the middle height of the second clamping piece 1b, if the b shaft 16 is rotated counterclockwise, the rolling wheel 26 will be separated from the second clamping piece 1b, and the continued rotation of the b shaft 16 will drive the rolling wheel 26 to move until it is tangent to the outer side surface at the middle height of the first clamping piece 1a.

[0039] The tooling method and working principle of the rear cover clamping device in the assembly process of the elbow wiring harness:

[0040] First, assemble the elbow terminal core 5, the terminal insulating shell 4 and the fixed rear cover 6 at the end of the wiring harness 13 according to "step 1" to "step 3", and then assemble the insulating cylinder 11 of the insulating shell 4 of the three structures downward, and place the insulating cylinder 11 between the cylinder holder 17 and the connecting arm 19, as shown in FIG. Figure 3 As shown, the end of the telescopic push rod 23 is finally controlled to extend, and the telescopic push rod 23 pushes the assembled structure composed of the elbow terminal core 5, the terminal insulating shell 4 and the fixed rear cover 6 along the length direction until the insulating cylinder 11 of the terminal insulating shell 4 is translated to the inner wall of the arc-shaped concave bayonet 24 of the side wall of the cylinder holder 17. Figure 4 As shown, the assembled structure composed of the elbow terminal core 5, the terminal insulating shell 4 and the fixed rear cover 6 is positioned as a whole and synchronized with the a rotating shaft 20. At this time, the rolling wheel 26 is just tangent to the outer side surface at the middle height of the second clamping piece 1b.

[0041] Tight and non-destructive clamping process based on tooling:

[0042] like Figure 5In the axial perspective shown, the axis of the a-rotating shaft 20 is recorded as the a-axis 28, and the axis of the b-rotating shaft 16 is recorded as the b-axis 29. It is first assumed that the position of the rolling wheel 26 is fixed and unchanged, and the driving device drives the a-rotating shaft 20 to rotate clockwise, so that the assembled structure composed of the elbow terminal inner core 5, the terminal insulating shell 4 and the fixed back cover 6 rotates slowly clockwise around the a-axis 28. From the perspective of relative movement, the rolling wheel 26 will relatively roll and constrain the second clamping piece 1b along a strict arc path, so that a section of the second clamping piece 1b close to the free end moves along a specific and strict arc path toward the near end. One side of the harness 13 is bent to eventually form a clamping sheet bent section 30. Due to the deviation in size and process, the contour shape and relative position of the hard arc-shaped sheet 12 must have certain deviations, resulting in two unfavorable situations in the final formed clamping sheet bent section 30. The first situation is that the formed clamping sheet bent section 30 does not fit tightly to the hard arc-shaped sheet 12, resulting in looseness after assembly; the second situation is that the target contour of the clamping sheet bent section 30 interferes with the outer contour of the hard arc-shaped sheet 12, thereby causing the hard arc-shaped sheet 12 to collapse during the clamping process; the following is the optimized method:

[0043] When the driving device drives the a-rotating shaft 20 to rotate clockwise, the driving device applies a clockwise torque to the b-rotating shaft 16, and the torque is transmitted to the rolling wheel 26 through the rocker arm 15, so that the rolling wheel 26 forms a stable rolling force on the second clamping sheet 1b at all times, and the driving device is controlled to apply a clockwise torque to the b-rotating shaft 16, so that the rolling force is sufficient to bend the second clamping sheet 1b but insufficient to crush the hard arc-shaped sheet 12; when the driving device drives the a-rotating shaft 20 to rotate clockwise, the rolling wheel 26 relatively moves along the hard arc-shaped sheet 12. The outer contour of the sheet 12 is rolled to constrain the second clamping sheet 1b, so that a section of the second clamping sheet 1b close to the free end is bent toward the side close to the wiring harness 13, and finally a clamping sheet bending section 30 is formed that closely fits the outer contour of the hard arc-shaped sheet 12 but is not crushed; the bending and clamping process of the second clamping sheet 1b is completed; finally, the a rotating shaft 20 is driven to rotate counterclockwise to the initial state, so that the assembly structure composed of the elbow terminal inner core 5, the terminal insulating shell 4 and the fixed rear cover 6 returns to the initial state, and then the first clamping sheet 1a needs to be bent and clamped;

[0044] Rotate the b rotating shaft 16 counterclockwise, so that the rocker arm 15 drives the rolling wheel 26 to move to be tangent to the outer side surface at the middle height of the first clamping piece 1a; then, bend and clamp the first clamping piece 1a with reference to the bending and clamping process of the second clamping piece 1b;

[0045] The free ends of the first clamping piece 1a and the second clamping piece 1b are finally bent toward each other and tightly clamp the end of the wiring harness 13, forming a closed-loop clamping body 2 that tightly clamps the end of the wiring harness 13. The end joints of the first clamping piece 1a and the second clamping piece 1b of the clamping body 2 are tightly fitted to the outer arc surface of the hard arc piece 12, thereby obtaining a wiring harness elbow 3 with a stable structure and an intact hard arc piece 12.

[0046] 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. An elbow wiring harness, characterized in that: It comprises a wiring harness (13), one end of which is an elbow terminal inner core (5), and the elbow terminal inner core (5) is provided with a terminal insulating shell (4) and a fixed rear cover (6); The elbow terminal inner core (5) comprises an elbow section a (9) and an elbow section b (8) which are vertically connected. The elbow section b (8) is consistent with the extension direction of the wire harness (13) and is connected to the end of the wire harness (13). The terminal insulating shell (4) comprises an insulating cylinder (11) and a rectangular insulating shell (10) which are vertically connected and connected as a whole. The tail end of the rectangular insulating shell (10) and the side away from the insulating cylinder (11) are both provided with open openings, so that a rectangular slot (14) is formed in the rectangular insulating shell (10); the insulating cylinder (11) is sleeved outside the elbow section a (9); and the elbow section b (8) is clamped in the rectangular slot (14) in the rectangular insulating shell (10) along the length direction.

2. The elbow wiring harness according to claim 1, characterized in that: A hard arc-shaped sheet (12) extending along the length direction of the wiring harness (13) is fixedly connected to the rear end of the rectangular insulating shell (10) close to the insulating cylinder (11), and the concave arc surface of the hard arc-shaped sheet (12) fits the outer arc surface of the wiring harness (13).

3. The elbow wiring harness according to claim 2, characterized in that: After the elbow section b (8) is clamped in the rectangular clamping groove (14), a rear cover clamping groove (14a) is formed on the side of the elbow section b (8) away from the elbow section a (9) in the rectangular clamping groove (14).

4. The elbow wiring harness according to claim 3, characterized in that: The fixed back cover (6) comprises a rectangular metal back cover (7), the front part of which is embedded in the back cover slot (14a), and the first clamping piece (1a) and the second clamping piece (1b) are symmetrically and vertically connected to each other on both sides of the rear part of the rectangular metal back cover (7), and the end of the wiring harness (13) is clamped between the first clamping piece (1a) and the second clamping piece (1b), and the free ends of the first clamping piece (1a) and the second clamping piece (1b) are bent toward the side close to each other in the assembled state and tightly clamp the end of the wiring harness (13), forming a closed-loop clamping body (2) that tightly clamps the end of the wiring harness (13), and the end joints of the first clamping piece (1a) and the second clamping piece (1b) of the clamping body (2) are tightly fitted to the outer arc surface of the hard arc-shaped piece (12).

5. The assembly process of an elbow wiring harness according to claim 4, characterized in that: The steps include: Step 1, preparing a wire harness (13) with an elbow terminal core (5), a terminal insulating housing (4), a fixed rear cover (6), and a rear cover clamping device (100); Step 2: The insulating cylinder (11) is sleeved outside the elbow section a (9), and the elbow section b (8) is clamped in the rectangular clamping groove (14) in the rectangular insulating housing (10) along the length direction, and the concave arc surface of the hard arc-shaped sheet (12) fits the outer arc surface of the wiring harness (13); in the rectangular clamping groove (14), the side of the elbow section b (8) away from the elbow section a (9) forms a rear cover clamping groove (14a); Step 3: insert the front part of the rectangular metal back cover (7) into the back cover slot (14a), and clamp the end of the wire harness (13) between the first clamping piece (1a) and the second clamping piece (1b); at this time, the elbow terminal core (5) is completed. The terminal insulating shell (4) and the fixed rear cover (6) are initially assembled, and the combined structure of the elbow terminal core (5), the terminal insulating shell (4) and the fixed rear cover (6) is still a loose structure; Step 4: The free ends of the first clamping piece (1a) and the second clamping piece (1b) are bent toward one side close to each other and tightly clamp the end of the wiring harness (13) through the rear cover clamping device (100), so as to form a closed-loop clamping body (2) that tightly clamps the end of the wiring harness (13), so that the end joints of the first clamping piece (1a) and the second clamping piece (1b) of the clamping body (2) are tightly fitted to the outer arc surface of the hard arc-shaped piece (12); thereby obtaining a wiring harness elbow (3) with a stable structure.

6. The rear cover clamping device for the elbow wiring harness assembly process according to claim 5, characterized in that: The rear cover clamping device (100) comprises a rotating shaft (20) that can be driven by a driving device, a telescopic device (21) is fixedly installed at the end of the rotating shaft (20) along the length direction, and a telescopic push rod (23) that can perform telescopic movement is provided at the end of the telescopic device (21); a connecting arm (19) that extends downward in an initial state is fixed to the lower side of the shell of the telescopic device (21), a horizontal slide (18) is vertically fixed to the end of the connecting arm (19), and a cylinder holder (18) is vertically connected to the upper side of one end of the horizontal slide (18) away from the connecting arm (19). 7), the distance between the cylinder holder (17) and the connecting arm (19) is greater than the outer diameter of the insulating cylinder (11); an arc-shaped inwardly concave bayonet (24) is provided on one side of the cylinder holder (17) close to the connecting arm (19), and the inner contour of the arc-shaped inwardly concave bayonet (24) is adapted to the outer contour of the insulating cylinder (11); a horizontal limit strip (25) parallel to the expander (21) is provided above the cylinder holder (17), and the horizontal limit strip (25) is fixedly connected to the shell of the expander (21) through a synchronous arm (22).

7. The rear cover clamping device for the elbow wiring harness assembly process according to claim 6, characterized in that: A b rotating shaft (16) which can be driven by a driving device is arranged on a side of the cylinder holder (17) away from the connecting arm (19), and the axis of the b rotating shaft (16) is parallel to the axis of the a rotating shaft (20) directly below the axis; the end of the b rotating shaft (16) is vertically fixedly connected to a rocker arm (15), and the end of the rocker arm (15) is vertically connected to a rolling wheel shaft (27) parallel to the b rotating shaft (16), and a rolling wheel (26) is rotatably mounted on the outside of the rolling wheel shaft (27) via a bearing.

8. The rear cover clamping device for the elbow wiring harness assembly process according to claim 7, characterized in that: The assembly structure tooling of the elbow terminal inner core (5), the terminal insulating shell (4) and the fixed back cover (6) is in the state of the back cover clamping device (100): the insulating cylinder (11) faces downward, and the lower end of the insulating cylinder (11) is limited to contact the surface of the horizontal slide (18), the side wall of the insulating cylinder (11) fits the inner wall of the arc-shaped concave bayonet (24) of the cylinder holder (17), the end of the telescopic push rod (23) extends out and presses the rectangular insulating shell (10) away from the front end of the cylinder holder (17); the lower surface of the horizontal limit strip (25) fits the upper surface of the rectangular metal back cover (7) along the length direction, the axis of the a rotating shaft (20) is coaxial with the axis of the end of the wire harness (13), and the b rotating shaft (16) is parallel to the bottom of the end of the wire harness (13); the rolling wheel (26) is tangent to the outer side surface at the middle height of the first clamping piece (1a) or the second clamping piece (1b); When the rolling wheel (26) is just tangent to the outer side surface at the middle height of the second clamping sheet (1b), if the b rotating shaft (16) is rotated counterclockwise, the rolling wheel (26) will be separated from the second clamping sheet (1b), and the b rotating shaft (16) will continue to rotate to drive the rolling wheel (26) to move to be tangent to the outer side surface at the middle height of the first clamping sheet (1a).

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