Fixing device for preventing HIL test wire harness terminal from being short-circuited

Abstract

The utility model relates to the technical field of automobile software testing, in particular to a fixing device for preventing HIL test wire harness terminals from being short-circuited. The device comprises a fixed part, an exit cylinder, an elastic piece and a base, one end of the fixing part and the withdrawing cylinder are arranged in the base; the fixing part is provided with a through hole, and the inner wall of the through hole is provided with a retaining structure; one end of the withdrawing cylinder is arranged in the through hole and the other end is rotationally connected with the base; a sliding connecting groove is formed in the side wall of the withdrawing cylinder, and the fixing part is provided with a connecting part which penetrates through the sliding connecting groove; rail grooves are formed in the outer walls of the fixing parts; the other end of the track frame is inserted into the track groove; the elastic piece is arranged in the base. According to the utility model, the unused wire harness terminals are inserted into the fixing part, so that different wire harness terminals are isolated, and the wire harness terminals are prevented from being mutually connected to form a short circuit; when the wire harness terminal needs to be used, the wire harness terminal is withdrawn from the fixing part through the withdrawing cylinder; and through cooperation of the rail groove and the rail frame, the stability of the fixing part is guaranteed, and the fixing part is prevented from shaking.

Description

Technical Field

[0001] This utility model relates to the field of automotive software testing technology, and more specifically, to a fixing device for preventing short circuits in HIL test harness terminals. Background Technology

[0002] In automotive development, system software and mechanical hardware are typically designed in parallel, and testing can only begin after integration. If serious safety risks are discovered after integration, it could lead to personal injury, equipment damage, and project delays. To mitigate these risks, High-Intensity Module (HIL) testing is widely used.

[0003] HIL testing, or Hardware-in-the-Loop Testing, is a testing method widely used in the field of automotive electronic control systems.

[0004] With the rapid development of the automotive industry, projects are increasingly being carried out in parallel. When switching between projects, the phenomenon of sharing wiring harnesses between different projects is becoming more and more common. The sharing of wiring harnesses means that some terminals that do not need to be connected to the HIL in a certain project are directly exposed, which may pose a risk of short circuit. Utility Model Content

[0005] The purpose of this application is to provide a fixing device for preventing short circuits at the terminals of HIL test harnesses, thereby solving the above-mentioned technical problems.

[0006] This utility model provides a fixing device for preventing short circuits in HIL test harness terminals, including a fixing part, a release cylinder, an elastic element, and a base;

[0007] One end of the fixing part and the ejection cylinder are both disposed inside the base;

[0008] The fixing part is provided with a through hole, and the inner wall of the through hole is provided with a backstop structure that cooperates with the wire harness terminal to prevent the wire harness terminal from coming out of the through hole;

[0009] One end of the ejection cylinder is disposed in the through hole, and the other end of the ejection cylinder is rotatably connected to the base;

[0010] A sliding connecting groove is provided on the side wall of the ejection cylinder, and a connecting part is provided on the fixing part. The connecting part passes through the sliding connecting groove and can abut against the wire harness terminal inserted into the ejection cylinder.

[0011] A track groove is provided on the outer wall of the fixing part;

[0012] The base is provided with a track frame, one end of which is fixed inside the base and the other end is inserted into the track groove to limit the rotation trajectory of the fixed part.

[0013] The elastic element is disposed within the base and is used to apply a force to the fixing part in a direction away from the base.

[0014] In an optional embodiment, the track groove includes a circulation groove composed of multiple circulation unit grooves;

[0015] The two side walls of the circulation unit groove are respectively a first upper side wall, a second upper side wall, a third upper side wall, a fourth upper side wall and a fifth upper side wall arranged on the upper side and connected in sequence, and a first lower side wall, a second lower side wall, a third lower side wall, a fourth lower side wall and a fifth lower side wall arranged on the lower side and connected in sequence.

[0016] The first upper sidewall is disposed opposite to the first lower sidewall, the third upper sidewall is disposed opposite to the second lower sidewall, the fourth upper sidewall is disposed opposite to the third lower sidewall, and the fifth upper sidewall is disposed opposite to the fourth lower sidewall;

[0017] In the axial direction of the fixing part, the sharp angle formed by the first lower sidewall and the second lower sidewall is opposite to the second upper sidewall, the sharp angle formed by the connection of the third upper sidewall and the fourth upper sidewall is opposite to the second lower sidewall, and the sharp angle formed by the connection of the fifth upper sidewall and the first upper sidewall in the adjacent circulation unit groove is opposite to the fifth lower sidewall.

[0018] Under the action of the elastic element, the end of the track frame at the rest position of the circulation unit groove forms a first included angle at the connection between the second lower sidewall and the third lower sidewall, or a second included angle at the connection between the fifth lower sidewall and the first lower sidewall in the adjacent circulation unit groove.

[0019] In an optional embodiment, there are multiple track frames, which are evenly arranged around the axis of the base.

[0020] In an optional embodiment, the anti-reverse structure is an annular baffle strip arranged circumferentially on the inner wall of the through hole.

[0021] In an optional embodiment, the other end of the ejection cylinder is rotatably connected to the base via a bearing.

[0022] In an optional embodiment, the elastic element is disposed inside the ejector cylinder and abuts against the connecting portion.

[0023] In an optional embodiment, the number of elastic elements is multiple, and the multiple elastic elements are uniformly arranged in a circular array around the exit cylinder.

[0024] In an optional embodiment, the fixing part includes a main body and a base plate;

[0025] The main body is disposed on one side of the base plate;

[0026] The through hole is provided on the main body;

[0027] The base plate includes an outer ring plate and an inner core plate;

[0028] The inner core plate and the outer ring plate are connected by the connecting part, and the inner core plate is slidably disposed inside the exit cylinder.

[0029] In an optional implementation, a chassis is also included;

[0030] The matching fixing part, the exit cylinder and the base constitute a fixing unit, and multiple fixing units are provided on the chassis.

[0031] In an optional embodiment, the fixing unit and the chassis are detachably connected.

[0032] The beneficial effects of this utility model embodiment are:

[0033] Unused wire harness terminals are inserted into the fixing part to isolate different wire harness terminals and prevent them from connecting and causing short circuits. When the wire harness terminals are needed, they are removed from the fixing part through the ejection cylinder, allowing them to be used normally. The cooperation between the track groove and the track frame ensures the stability of the fixing part and prevents the fixing part from shaking, which would affect the performance of the wire harness terminals. Attached Figure Description

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 A front view of the fixing device provided in an embodiment of this utility model;

[0036] Figure 2 for Figure 1 AA section view;

[0037] Figure 3 for Figure 1 AA cross-sectional view of another embodiment;

[0038] Figure 4 A schematic diagram of the wire harness terminal of the fixing device provided in the embodiment of this utility model;

[0039] Figure 5 A top view of the fixing part of the fixing device provided in an embodiment of this utility model;

[0040] Figure 6 for Figure 5 BB section view;

[0041] Figure 7 A top view of the base plate of the fixing device provided in an embodiment of this utility model;

[0042] Figure 8 An unfolded view of the track groove of the fixing device provided in an embodiment of this utility model;

[0043] Figure 9 A top view of the exit structure of the fixing device provided in an embodiment of this utility model;

[0044] Figure 10 for Figure 9 CC section view;

[0045] Figure 11 for Figure 9 DD sectional view;

[0046] Figure 12 A schematic diagram of the structure of the base of the fixing device provided in the embodiment of this utility model;

[0047] Figure 13 This is a structural diagram of the fixing device provided in an embodiment of the present utility model when it has multiple fixing units.

[0048] icon:

[0049] 1-Base; 2-Fixing part; 3-Wire harness terminal; 4-Exit cylinder; 5-Annular stop bar; 6-Barb; 7-Elastic element; 8-Sliding connection groove; 9-Rail frame; 10-Rail groove; 11-Bearing; 12-Main body; 13-Base plate; 14-Inner core plate; 15-Outer ring plate; 16-Connecting part; 17-First upper side wall; 18-Second upper side wall; 19-Third upper side wall; 20-Fourth upper side wall; 21-Fifth upper side wall; 22-First lower side wall; 23-Second lower side wall; 24-Third lower side wall; 25-Fourth lower side wall; 26-Fifth lower side wall; 27-Fixing unit; 28-Chassis. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0051] In the description of this application, it should be noted that the terms "inner" and "outer" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the product of this application is typically placed when in use. These terms are intended solely to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" and the like are used solely for distinction and should not be construed as indicating or implying relative importance.

[0052] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0053] This utility model provides a fixing device for preventing short circuits at the terminals of HIL test harnesses, such as... Figures 1 to 13 As shown, the device includes a fixing part 2, an ejector cylinder 4, an elastic element 7, and a base 1. One end of the fixing part 2 and the ejector cylinder 4 are both disposed inside the base 1. The fixing part 2 has a through hole, and the inner wall of the through hole has a locking structure that cooperates with the wire harness terminal 3 to prevent the wire harness terminal 3 from disengaging from the through hole. One end of the ejector cylinder 4 is disposed in the through hole, and the other end of the ejector cylinder 4 is rotatably connected to the base 1. The side wall of the ejector cylinder 4 has a sliding connecting groove 8, and the fixing part 2 has a connecting part 16 that passes through the sliding connecting groove 8 and can abut against the wire harness terminal 3 inserted into the ejector cylinder 4. The outer wall of the fixing part 2 has a track groove 10. The base 1 has a track frame 9, one end of which is fixed inside the base 1, and the other end is inserted into the track groove 10 to limit the rotation trajectory of the fixing part 2. The elastic element 7 is disposed inside the base 1 and is used to apply a force to the fixing part 2 away from the base 1.

[0054] In this embodiment, the fixing device for preventing short circuits at the HIL test harness terminals is as follows: Figure 1 This is a front view. Figure 2 and Figure 3 for Figure 1 AA cross-sectional views of two different structures, Figure 4 This is a schematic diagram of the structure of wire harness terminal 3, which is cylindrical or other shapes.

[0055] In this embodiment, the shape of the fixing device can be as follows: Figure 1 and Figure 2 The cylindrical shape can be any shape, and its internal space is determined according to the shape of the wire harness terminal 3.

[0056] In this embodiment and the following embodiments, the wire harness terminal 3 is cylindrical and the overall device shape is also cylindrical for illustration.

[0057] Specifically, in this embodiment, the fixing device consists of three parts, including a base 1, a fixing part 2, and an exit cylinder 4.

[0058] In this embodiment, the entire device is made of insulating material.

[0059] The base 1 can be any shape, such as cylindrical or square, and its internal space shape is consistent with that of the fixing part 2, so as to limit the movement trajectory of the fixing part 2.

[0060] In this embodiment, a resilient barb 6 is provided on the outer wall of the wire harness terminal 3, which can cooperate with the anti-retraction structure after being inserted into the through hole to prevent the wire harness terminal 3 from detaching from the through hole.

[0061] In this embodiment, the barbs 6 are arranged in pairs, with one barb 6 at each end of the diameter of the wire harness terminal 3, forming a pair of barbs 6.

[0062] It can also be set around the periphery of the wire harness terminal 3, and the specific number can be set according to actual needs.

[0063] like Figure 9 To exit the top view of cylinder 4, Figure 10 for Figure 9 CC section view, Figure 11 for Figure 9 DD sectional view.

[0064] In this embodiment, the ejection cylinder 4 is mainly used to collect the barbs 6 into the ejection cylinder 4 when the wire harness terminal 3 and the fixing part 2 are pressed down simultaneously. At this time, while ensuring that the fixing part 2 is still in the pressed position, the terminal can be easily and manually removed. Figure 2As shown, when the upper end of the anti-retraction structure on the fixing part 2 coincides with the upper end of the ejection cylinder 4, the barb 6 of the second anti-retraction structure will inevitably enter the ejection cylinder 4. At this time, the wire harness terminal 3 can be removed from the ejection cylinder 4. After the wire harness terminal 3 is removed, the downward pressing force of the fixing part 2 can be canceled, and the fixing part 2 will be reset.

[0065] Similarly, when placing the wire harness terminal 3, manually hold the fixing part 2 and insert the wire harness terminal 3 into the through hole of the fixing part 2. When the tip of the barb 6 of the wire harness terminal 3 moves to the bottom of the anti-retraction structure on the fixing part 2, the wire harness terminal 3 can be fixed in the fixing part 2.

[0066] In this embodiment, the elastic element 7 can be used to apply a resetting force to the fixing part 2, so that the wire harness terminal 3 can be removed from the ejection cylinder 4 and the fixing part 2, and the fixing part 2 can be reset.

[0067] In this embodiment, a track groove 10 is provided on the outer wall of the fixing part 2, and a track frame 9 is provided inside the base 1. One end of the track frame 9 is fixed on the base 1, and the other end is provided in the track groove 10. By cooperating with the track groove 10, the rotation trajectory of the fixing part 2 can be limited, and the shaking of the fixing part 2 when it moves up and down can be avoided.

[0068] Specifically, in this embodiment, when the wire harness terminal 3 is withdrawn, it is pressed down, which causes the fixing part 2 to move toward the base 1, the connecting part 16 to slide in the sliding connecting groove 8, and the track frame 9 to move in the track groove 10. At this time, the fixing part 2 rotates and moves linearly relative to the base 1, the fixing part 2 moves linearly relative to the withdrawal cylinder 4, and the withdrawal cylinder 4 rotates relative to the base 1.

[0069] With this configuration, under the dual constraints of the sliding connection groove 8 of the track frame 9 and the exit cylinder 4, the fixing part 2 can rotate and move linearly stably, without shaking during the installation and removal of the wire harness terminal 3, thus ensuring the quick insertion and removal of the wire harness terminal 3.

[0070] In alternative implementations, such as Figure 8As shown, the track groove 10 includes a circulation groove composed of multiple circulation unit grooves; the two side walls of the circulation unit groove are respectively a first upper side wall 17, a second upper side wall 18, a third upper side wall 19, a fourth upper side wall 20, and a fifth upper side wall 21 arranged on the upper side and connected in sequence, and a first lower side wall 22, a second lower side wall 23, a third lower side wall 24, a fourth lower side wall 25, and a fifth lower side wall 26 arranged on the lower side and connected in sequence; the first upper side wall 17 is arranged opposite to the first lower side wall 22, the third upper side wall 19 is arranged opposite to the second lower side wall 23, the fourth upper side wall 20 is arranged opposite to the third lower side wall 24, and the fifth upper side wall 21 is arranged opposite to the fourth lower side wall 25; in the In the axial direction of the fixing part 2, the sharp angle formed by the first lower sidewall 22 and the second lower sidewall 23 is opposite to the second upper sidewall 18, the sharp angle formed by the connection of the third upper sidewall 19 and the fourth upper sidewall 20 is opposite to the second lower sidewall 23, and the sharp angle formed by the connection of the fifth upper sidewall 21 and the first upper sidewall 17 in the adjacent circulation unit groove is opposite to the fifth lower sidewall 26; under the action of the elastic member 7, the end of the track frame 9 is at a rest position in the circulation unit groove at a first included angle formed at the connection of the second lower sidewall 23 and the third lower sidewall, or at a second included angle formed at the connection of the fifth lower sidewall 26 and the first lower sidewall 22 in the adjacent circulation unit groove.

[0071] In this embodiment, the following is established: Figure 8 In the Cartesian coordinate system shown, the slopes of the first upper sidewall 17, the second upper sidewall 18, and the fourth upper sidewall 20 are positive, while the slopes of the third upper sidewall 19 and the fifth upper sidewall 21 are negative; the slopes of the first lower sidewall 22 and the third lower sidewall 24 are positive, while the slopes of the second lower sidewall 23, the fourth lower sidewall 25, and the fifth lower sidewall 26 are negative. The elastic element 7 is located below the fixed part 2, and under the action of the elastic element 7, the fixed part 2 has a force that moves in the positive y direction.

[0072] When the fixing part 2 rotates under the action of the track groove 10, it can position the downward pressure of the fixing part 2. When the end of the track frame 9 is at the first included angle, the corresponding fixing part 2 is at a high position. At this time, there is a gap between the anti-retraction structure and the top of the exit cylinder 4. The anti-retraction structure can abut against the barb 6 of the wire harness terminal 3 to achieve the positioning of the wire harness terminal 3. When the end of the track frame 9 is at the second included angle, the corresponding fixing part 2 is at a low position. At this time, there is no gap between the anti-retraction structure and the top of the exit cylinder 4. The wire harness terminal 3 is completely inserted into the exit cylinder 4. The fixing part 2 is stuck in the second included angle and cannot move, thereby facilitating the removal of the wire harness terminal 3 from the exit cylinder 4 and realizing the disassembly of the wire harness terminal 3.

[0073] The switching process of the fixed part 2 between high and low positions is achieved through the cooperation of the track frame 9 and the track groove 10. This process includes two stages: stage a and stage b. Stage a is the switching from high to low position, and stage b is the switching from low to high position. The specific switching process is as follows:

[0074] During the switching process of section a, the initial position of the end of track frame 9 is at Figure 8 At the first included angle position shown, pressing the wire harness terminal 3 causes the fixing part 2 to move downwards, and the end of the track frame 9 abuts against the fourth upper side wall 20. Under the action of the fourth upper side wall 20, the fixing part 2 rotates in the negative x-axis direction. When it rotates to the included angle formed between the fourth upper side wall 20 and the fifth upper side wall 21, the wire harness terminal 3 is released, and the fixing part 2 moves in the positive y-axis direction under the action of the elastic member 7. At this time, the end of the track frame 9 abuts against the fourth lower side wall 25. Under the action of the fourth lower side wall 25, the fixing part 2 continues to rotate in the negative x-axis direction. When the end of the track frame 9 moves to the fifth lower side wall 26, the slope of the fifth lower side wall 26 is negative. Under the action of the elastic member 7, the fixing part 2 continues to rotate in the negative x-axis direction until the end of the fixing frame is stuck in the second included angle, and the fixing part 2 stops rotating. In this state, the wire harness terminal 3 is fully inserted into the withdrawal cylinder 4, and the barb 6 retracts, thereby facilitating the extraction of the wire harness terminal 3.

[0075] During the switching process of section b, the initial position of the end of track frame 9 is located at Figure 8 At the second included angle, pressing the fixing part 2 downwards causes the end of the track frame 9 to abut against the first upper side wall 17. The slope of the first upper side wall 17 is positive. Under the action of the first upper side wall 17, the fixing part 2 rotates in the negative direction of the x-axis. When the end of the track frame 9 moves to the second upper side wall 18, the slope of the second upper side wall 18 is positive. Pressing the fixing part 2 again causes it to continue rotating in the negative direction of the x-axis until the end of the fixing frame is stuck between the second upper side wall 18 and the third upper side wall 17. When the angle formed between 9 is negative, the fixing part 2 cannot rotate when the end of the track frame 9 reaches this position. At this time, the fixing part 2 is released, and the fixing part 2 abuts against the second lower side wall 23 under the action of the elastic member 7. The slope of the second lower side wall 23 is negative, so the fixing part 2 continues to rotate in the negative direction of the x-axis under the action of the elastic member 7 until it reaches the first angle position and stops rotating. At this time, the fixing frame reaches the high position, which is convenient for the insertion and positioning of the wire harness terminal 3.

[0076] In an optional embodiment, there are multiple track frames 9, which are evenly arranged around the axis of the base 1.

[0077] In this embodiment, there are two or more track frames 9, such as three or four, which are evenly arranged in a circle around the axis of the base 1, thereby effectively ensuring the balance of the fixing part 2.

[0078] It is understandable that the number of track frames 9 is adapted to the number of circulation unit slots of track groove 10, and their number is necessarily less than the number of circulation unit slots of track groove 10, and the position of the fixing frame corresponds to the position of the track unit slot.

[0079] In an optional embodiment, the anti-reverse structure is an annular baffle 5 arranged circumferentially on the inner wall of the through hole.

[0080] In this embodiment, if Figure 6 As shown, the anti-retraction structure is an annular baffle 5, which is set around the center line of the through hole and surrounds the inner wall of the through hole. It can block all the barbs 6 entering the through hole, thereby effectively preventing the wire harness terminal 3 from coming out of the through hole, ensuring the positioning stability of the wire harness terminal 3, and reducing the risk of short circuit.

[0081] In an optional embodiment, the other end of the ejection cylinder 4 is rotatably connected to the base 1 via a bearing 11.

[0082] In this embodiment, the ejection cylinder 4 is connected to the base 1 by the bearing 11, which can ensure the connection stability between the ejection cylinder 4 and the base 1, and at the same time reduce the wear between the ejection cylinder 4 and the base 1, thereby improving the service life of the base 1 and the ejection cylinder 4.

[0083] In this embodiment, the base 1 is fixedly connected to the outer ring of the bearing 11, and the ejection cylinder 4 is fixedly connected to the inner ring of the bearing 11. Alternatively, the base 1 can be fixedly connected to the inner ring of the bearing 11, and the ejection cylinder 4 can be fixedly connected to the outer ring of the bearing 11. The specific connection can be selected based on the diameter of the bearing 11 and the diameter of the ejection cylinder 4.

[0084] In an optional embodiment, the elastic element 7 is disposed inside the ejector cylinder 4 and abuts against the connecting portion 16.

[0085] In this embodiment, the elastic element 7 is disposed inside the ejection cylinder 4, and the connecting part 16 extends into the ejection cylinder 4 through the sliding connecting groove 8, thereby being able to connect with the elastic element 7. The connection method can be abutment or other methods, and the elastic element 7 can apply a force to the fixing part 2 away from the base 1.

[0086] Specifically, in this embodiment, the elastic element 7 is a compression spring, one end of which is disposed on the base 1 and the other end abuts against the fixing part 2, applying a force to the fixing part 2 away from the base 1.

[0087] It is understood that in this embodiment, the elastic element 7 is a compression spring, but it is not limited to a compression spring. It can also be other types of elastic elements 7, such as a spring sheet, as long as it can apply a force to the fixing part 2 away from the base 1.

[0088] In an optional embodiment, there are multiple elastic elements 7, which are evenly arranged in a circular array around the exit cylinder 4.

[0089] In this embodiment, the elastic element 7 can be disposed outside the exit cylinder 4 inside the base 1 and evenly arranged in a circular array around the exit cylinder 4, so that it can apply a force to the fixing part 2 away from the base 1, and ensure the balance and stability of the force.

[0090] In this embodiment, the elastic element 7 is a compression spring.

[0091] It is understandable that the position of the compression spring can be set according to actual needs. When the compression spring is set inside the exit cylinder 4, only one compression spring is needed, which is low cost; when the compression spring is set outside the exit cylinder 4, multiple compression springs are needed to ensure force balance, which is more expensive, but easier and simpler to install.

[0092] In alternative implementations, such as Figure 5 , Figure 6 and Figure 7 As shown, the fixing part 2 includes a main body part 12 and a base plate 13; the main body part 12 is disposed on one side of the base plate 13; the through hole is disposed on the main body part 12; the base plate 13 includes an outer ring plate 15 and an inner core plate 14; the inner core plate 14 and the outer ring plate 15 are connected by the connecting part 16, and the inner core plate 14 is disposed inside the exit cylinder 4.

[0093] In this embodiment, the base plate 13 of the fixing part 2 is divided into two parts: an outer ring plate 15 and an inner core plate 14.

[0094] Specifically, in this embodiment, the outer ring plate 15 is an annular structure, disposed outside the ejection cylinder 4, and fixedly connected to the main body 12 of the fixing part 2; the inner core plate 14 is disposed inside the ejection cylinder 4 and abuts against the compression spring.

[0095] In this embodiment, the connection between the connecting part 16 and the inner core plate 14 and the outer ring plate 15 can be integrally set. In this case, the upper end of the sliding connecting groove 8 on the exit cylinder 4 is open, which facilitates installation. The connection between the connecting part 16 and the inner core plate 14 and the outer ring plate 15 can also be snap-fit, plug-in, etc., so as to facilitate the installation connection between the base plate 13 and the exit cylinder 4.

[0096] In alternative implementations, such as Figure 12 and Figure 13 As shown, it also includes a chassis 28; the fixing part 2, the exit cylinder 4 and the base 1, which are matched and arranged, constitute a fixing unit 27, and multiple fixing units 27 are provided on the chassis 28.

[0097] By using magnets or Velcro to attach each individual fixing unit 27 to the chassis 28, flexible distribution and placement are achieved. Figure 11 As shown, the circle represents a single fixed unit 27, which can be freely combined and placed.

[0098] It should be noted that the shape of the chassis 28 is not limited to a rectangle.

[0099] In an optional embodiment, the fixing unit 27 and the chassis 28 are detachably connected.

[0100] It should also be noted that the detachable connection between the fixing unit 27 and the chassis 28 can be a magnet or Velcro, but it is not limited to these two methods. It can also be other detachable connection methods, such as snap-fit, as long as it can achieve a convenient detachable connection between the fixing unit 27 and the chassis 28.

[0101] The beneficial effects of this utility model embodiment are:

[0102] Unused wire harness terminals 3 are inserted into the fixing part 2 to isolate different wire harness terminals 3 and prevent them from connecting to each other and causing a short circuit. When the wire harness terminals 3 are needed, they are removed from the fixing part 2 through the ejection cylinder 4, so that the wire harness terminals 3 can be used normally. The cooperation between the track groove 10 and the track frame 9 ensures the stability of the fixing part 2 and prevents the fixing part 2 from shaking, which would affect the use of the wire harness terminals 3.

[0103] It should be noted that, unless there is any conflict, the features in the embodiments of this application can be combined with each other.

[0104] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A fixing device for preventing short circuits at the terminals of a HIL test harness, characterized in that, Includes a fixing part, an ejector cylinder, a flexible element, and a base; One end of the fixing part and the ejection cylinder are both disposed inside the base; The fixing part is provided with a through hole, and the inner wall of the through hole is provided with a backstop structure that cooperates with the wire harness terminal to prevent the wire harness terminal from coming out of the through hole; One end of the ejection cylinder is disposed in the through hole, and the other end of the ejection cylinder is rotatably connected to the base; A sliding connecting groove is provided on the side wall of the ejection cylinder, and a connecting part is provided on the fixing part. The connecting part passes through the sliding connecting groove and can abut against the wire harness terminal inserted into the ejection cylinder. A track groove is provided on the outer wall of the fixing part; The base is provided with a track frame, one end of which is fixed inside the base and the other end is inserted into the track groove to limit the rotation trajectory of the fixed part. The elastic element is disposed within the base and is used to apply a force to the fixing part in a direction away from the base.

2. The fixing device according to claim 1, characterized in that, The track groove includes a circulation groove composed of multiple circulation unit grooves; The two side walls of the circulation unit groove are respectively a first upper side wall, a second upper side wall, a third upper side wall, a fourth upper side wall and a fifth upper side wall arranged on the upper side and connected in sequence, and a first lower side wall, a second lower side wall, a third lower side wall, a fourth lower side wall and a fifth lower side wall arranged on the lower side and connected in sequence. The first upper sidewall is disposed opposite to the first lower sidewall, the third upper sidewall is disposed opposite to the second lower sidewall, the fourth upper sidewall is disposed opposite to the third lower sidewall, and the fifth upper sidewall is disposed opposite to the fourth lower sidewall; In the axial direction of the fixing part, the sharp angle formed by the first lower sidewall and the second lower sidewall is opposite to the second upper sidewall, the sharp angle formed by the connection of the third upper sidewall and the fourth upper sidewall is opposite to the second lower sidewall, and the sharp angle formed by the connection of the fifth upper sidewall and the first upper sidewall in the adjacent circulation unit groove is opposite to the fifth lower sidewall. Under the action of the elastic element, the end of the track frame at the rest position of the circulation unit groove forms a first included angle at the connection between the second lower sidewall and the third lower sidewall, or a second included angle at the connection between the fifth lower sidewall and the first lower sidewall in the adjacent circulation unit groove.

3. The fixing device according to claim 2, characterized in that, The number of track frames is multiple, and the multiple track frames are evenly arranged around the axis of the base.

4. The fixing device according to claim 1, characterized in that, The anti-reverse structure is an annular baffle strip arranged circumferentially on the inner wall of the through hole.

5. The fixing device according to claim 1, characterized in that, The other end of the ejection cylinder is rotatably connected to the base via a bearing.

6. The fixing device according to claim 1, characterized in that, The elastic element is disposed inside the ejector cylinder and abuts against the connecting portion.

7. The fixing device according to claim 1, characterized in that, The number of elastic elements is multiple, and the multiple elastic elements are evenly arranged in a circular array around the exit cylinder.

8. The fixing device according to claim 1, characterized in that, The fixing part includes a main body and a base plate; The main body is disposed on one side of the base plate; The through hole is provided on the main body; The base plate includes an outer ring plate and an inner core plate; The inner core plate and the outer ring plate are connected by the connecting part, and the inner core plate is disposed inside the exit cylinder.

9. The fixing device according to claim 1, characterized in that, It also includes the chassis; The matching fixing part, the exit cylinder and the base constitute a fixing unit, and multiple fixing units are provided on the chassis.

10. The fixing device according to claim 9, characterized in that, The fixing unit is detachably connected to the chassis.

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