Hand-held device for detecting pull-back value of lead in connection state

Abstract

The invention provides a handheld device for detecting a pull-back value of a wire in a connection state, and the device comprises a device housing and a wire harness clamp assembly which can move relatively. A preset tension sliding block and a middle pulling sliding block are arranged in the device shell in a sliding mode. The middle pulling sliding block is connected with the device shell through the tension spring, and the wire harness clamp assembly is connected with the middle pulling sliding block. A locking piece and a resetting piece are arranged on the device shell; during inspection, the preset tension sliding block slides to a preset inspection position and is fixed on the device shell through the locking piece, the device shell is pulled, the middle pulling sliding block moves in the device shell, and when the middle pulling sliding block moves to the preset tension sliding block, the middle pulling sliding block is limited and fixed by the preset tension sliding block; the reset piece can relieve the limiting and fixing state of the middle pulling sliding block so that the middle pulling sliding block can be reset. The device provided by the invention realizes the pullback force measurement of the wire in a connection state in a narrow environment in the electrical cabinet, so as to ensure that the wiring accords with the installation standard and avoid loosening.

Description

Technical Field

[0001] The present invention relates to the technical field of wire inspection, in particular to a handheld device for inspecting the pullback value of a wire in a connected state, and in particular to a device for measuring the pullback force value of a wire after installation in a narrow space of an electrical cabinet. Background Art

[0002] Wire plug-in is an important connection method for electrical cabinet wiring, and its connection reliability is closely related to the performance of the equipment cabinet. There are many wires in the electrical cabinet, and if any of the wires are not firmly plugged in, it is easy for the wire to become loose or short-circuited, resulting in the failure of certain control functions. Therefore, wire plug-in needs to ensure stable and reliable connection retention.

[0003] In order to ensure that the wire is reliably locked, after the wire is inserted into the connection hole, the most widely used and convenient inspection method is to confirm by pulling it back by hand. If the wire cannot be pulled out, it means that the lock is reliable, otherwise it must be reinserted. However, measuring the tightness of the wire only by hand will make it impossible to make an accurate judgment due to the different feelings of tightness among different inspectors. In addition, if the force is too great, the connection hole will be damaged, while if the force is too small, it will not have any detection effect.

[0004] Therefore, the uncontrollable pullback force of the wire is also an important factor affecting the quality of electrical equipment. In addition, the space of the electrical cabinet is small, the number of wiring is large, and the existing measuring device is large, which is not convenient for the staff to carry into the electrical cabinet for testing. Therefore, it is necessary to develop a handheld device to check the pullback value of the wire in the connected state, and display the tightness of the wire in the connected state through a numerical value.

[0005] The patent document with the publication number CN221281198U discloses a pull-back detection device for multiple sets of harness connector terminal harnesses at the same time, which is composed of a mounting base plate, a slot assembly for arranging multiple wires of multiple sets of harness connectors, a wire pressing mechanism, a wire pulling mechanism and a wire pressing gantry. The outer sleeve of the pull rod is provided with a spring, and the other end of the pull rod is provided with a probe seat installed in the mounting slot. The probe seat is connected with multiple probes opposite to the pull rod. However, the patent document still has the defect of being large in size. Summary of the invention

[0006] In view of the defects in the prior art, the object of the present invention is to provide a handheld device for checking the pullback value of a wire in a connected state.

[0007] According to the present invention, a handheld device for checking the pullback value of a wire in a connected state comprises: a device housing and a wire harness clamp assembly, wherein the device housing and the wire harness clamp assembly can move relative to each other;

[0008] A preset tension slider and an intermediate pulling slider are slidably arranged in the device housing; the intermediate pulling slider is connected to the device housing through a tension spring, and the harness clamp assembly is connected to the intermediate pulling slider; a locking member and a reset member are arranged on the device housing;

[0009] During inspection: the preset tension slider is slid to the preset inspection position, fixed to the device housing by the locking member, the device housing is pulled, and the intermediate pulling slider moves inside the device housing. When it moves to the preset tension slider, it is limited and fixed by the preset tension slider; the reset member can release the limited and fixed state of the intermediate pulling slider and reset it.

[0010] Preferably, the handheld device further comprises: a device lining;

[0011] A sliding groove is provided in the device housing, the device lining is slidably arranged in the sliding groove, and the harness clamp assembly is connected to the device lining;

[0012] The preset pulling force slider and the intermediate pulling slider are slidably arranged in the sliding groove.

[0013] Preferably, the harness clamp assembly comprises: a pressure spring, a pressure latch, a dynamic pressure plate and a static pressure plate;

[0014] A mounting frame is provided on the inner lining of the device, and the static pressure plate and the dynamic pressure plate are relatively arranged on the mounting frame;

[0015] The dynamic pressure plate is pressed against the static pressure plate by the pressure spring, the pressure latch is connected to the dynamic pressure plate, and the pressure latch can pull the dynamic pressure plate away from the static pressure plate;

[0016] The dynamic pressure plate and the static pressure plate are both provided with a harness groove for clamping the harness.

[0017] Preferably, a device base is provided on the device housing;

[0018] The intermediate pulling slider is connected to the device base via the tension spring;

[0019] The harness clamp assembly and the device base are respectively located at two ends of the device housing, and the middle pulling slider is located between the preset pulling slider and the device base.

[0020] Preferably, the harness clamp assembly is connected to the middle pull slider via an internal connecting rod;

[0021] The preset pulling force slider is provided with a through hole, and the internal connecting rod passes through the through hole and is connected with the middle pulling slider.

[0022] Preferably, a limiting groove is provided on the preset pulling force slider, and the limiting groove is used to limit and fix the intermediate pulling slider;

[0023] When the intermediate pulling sliding block moves to the limiting groove, it can be engaged in the limiting groove.

[0024] Preferably, the locking member is a fixed knob, and the reset member is a reset button;

[0025] A moving groove is provided on the device housing along the length direction of the sliding groove, the moving groove is located below the preset tension slider, and the fixed knob and the reset button are slidably arranged in the moving groove;

[0026] The fixing knob can slide to the position of the preset tension slider through the moving slot to fix the preset tension slider;

[0027] The reset button can slide to the position of the limiting groove through the moving groove to push the middle pulling slider out of the limiting groove.

[0028] Preferably, a slope guide structure is provided on the preset tension slider;

[0029] The slope guide structure is provided with a guide slope and a spring accommodating groove. The intermediate pulling slider slides through the guide slope and falls into the limiting groove. The spring accommodating groove is used to accommodate the tension spring.

[0030] Preferably, an observation slot is provided on the device housing along the length direction of the sliding slot, and the observation slot is used to observe the sliding of the preset pulling slider and the intermediate pulling slider;

[0031] A tension scale plate is arranged on the device housing along the length direction of the observation slot, and indicator lines are arranged on the preset tension slider and the intermediate pulling slider, and the indicator lines are used to align the scale lines of the tension scale plate.

[0032] Preferably, a mounting groove is provided on the device housing, and the tension scale plate is detachably mounted in the mounting groove.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. The device of the present invention is small in size and light in weight, and the operator can directly hold it and enter the interior of the electrical cabinet to measure the pull-back force value.

[0035] 2. The device of the present invention is easy to operate and will give a reminder when the tension value is reached. A preset tension slider and an intermediate pulling slider are provided inside the device. The preset tension slider is fixed at the tension scale value to be reached through a preset tension fixing knob, and the clamp is clamped at the terminal to be measured. When the tension reaches the required tension value, the intermediate pulling slider enters the groove of the preset tension slider, a knocking sound is heard, and it cannot be pulled.

[0036] 3. The device of the present invention is easy to reset. When performing the next measurement, you only need to push up the tension spring reset button to reset the middle pulling slider in the preset tension slider groove, and continue the next measurement, thereby improving the convenience and practicality of the measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0038] Figure 1 It is a schematic diagram of the overall structure of the device of the present invention;

[0039] Figure 2 It is a schematic diagram of the structure of the device of the present invention before measuring the tension of the connecting terminal;

[0040] Figure 3 It is a structural schematic diagram of the device of the present invention when the measured tension value reaches the set value;

[0041] Figure 4 It is a structural schematic diagram of the internal structure of the device of the present invention when it is reset;

[0042] Figure 5 Schematic diagram of the internal structure of the device of the present invention from the bottom perspective.

[0043] The figure shows:

[0044] Device housing 1 Fixing knob 13

[0045] Device lining 2 Slide slot 14

[0046] Pressure spring 3 Static pressure plate 15

[0047] Pressure pin 4 Mounting bracket 16

[0048] Dynamic pressure plate 5 Wire harness groove 17

[0049] Internal connecting rod 6 passes through through hole 18

[0050] Preset tension slider 7 Limiting groove 19

[0051] Tension scale plate 8 Slope guide structure 20

[0052] Middle pull slide 9 guide slope 21

[0053] Device base 10 Spring receiving groove 22

[0054] Tension spring 11 Observation slot 23

[0055] Reset button 12 Moving slot 24 DETAILED DESCRIPTION

[0056] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0057] Embodiment 1:

[0058] like Figure 1-5 As shown, the present embodiment provides a handheld device for testing the pullback value under the connection state of the wire, comprising: a device housing 1 and a harness clamp assembly, the device housing 1 and the harness clamp assembly can move relative to each other; a preset tension slider 7 and an intermediate pulling slider 9 are slidably arranged in the device housing 1; the intermediate pulling slider 9 is connected to the device housing 1 through a tension spring 11, and the harness clamp assembly is connected to the intermediate pulling slider 9; a locking member and a reset member are arranged on the device housing 1; during testing: the preset tension slider 7 is slid to a preset testing position, fixed to the device housing 1 through a locking member, the device housing 1 is pulled, the intermediate pulling slider 9 moves in the device housing 1, and when it moves to the preset tension slider 7, it is limited and fixed by the preset tension slider 7; the reset member can release the limited and fixed state of the intermediate pulling slider 9 to reset it.

[0059] The handheld device further includes: a device liner 2; a sliding groove 14 is provided in the device housing 1, the device liner 2 is slidably arranged in the sliding groove 14, and the harness clamp assembly is connected to the device liner 2; the preset tension slider 7 and the intermediate pull slider 9 are slidably arranged in the sliding groove 14. A device base 10 is provided on the device housing 1; the intermediate pull slider 9 is connected to the device base 10 through a tension spring 11; the harness clamp assembly and the device base 10 are respectively located at two ends of the device housing 1, and the intermediate pull slider 9 is located between the preset tension slider 7 and the device base 10.

[0060] The wire harness clamp assembly includes: a pressure spring 3, a pressure pin 4, a dynamic pressure plate 5 and a static pressure plate 15; a mounting frame 16 is provided on the device lining 2, and the static pressure plate 15 and the dynamic pressure plate 5 are relatively arranged on the mounting frame 16; the dynamic pressure plate 5 is pressed against the static pressure plate 15 by the pressure spring 3, and the pressure pin 4 is connected to the dynamic pressure plate 5, and the pressure pin 4 can pull the dynamic pressure plate 5 away from the static pressure plate 15; both the dynamic pressure plate 5 and the static pressure plate 15 are provided with a wire harness groove 17 for clamping the wire harness.

[0061] An observation slot 23 is provided on the device housing 1 along the length direction of the sliding slot 14, and the observation slot 23 is used to observe the sliding of the preset tension slider 7 and the intermediate pulling slider 9; a tension scale plate 8 is provided on the device housing 1 along the length direction of the observation slot 23, and both the preset tension slider 7 and the intermediate pulling slider 9 are provided with indicator lines, and the indicator lines are used to align the scale lines of the tension scale plate 8. An installation groove is provided on the device housing 1, and the tension scale plate 8 can be detachably installed in the installation groove.

[0062] The harness clamp assembly is connected to the middle pull slider 9 through the internal connecting rod 6; the preset pull slider 7 is provided with a through hole 18, and the internal connecting rod 6 passes through the through hole 18 to connect with the middle pull slider 9. The preset pull slider 7 is provided with a limiting groove 19, and the limiting groove 19 is used to limit and fix the middle pull slider 9; when the middle pull slider 9 moves to the limiting groove 19, it can be clamped in the limiting groove 19. The locking member is a fixed knob 13, and the reset member is a reset button 12; the device housing 1 is provided with a moving groove 24 along the length direction of the sliding groove 14, and the moving groove 24 is located below the preset pull slider 7, and the fixed knob 13 and the reset button 12 are slidably arranged in the moving groove 24; the fixed knob 13 can slide to the position of the preset pull slider 7 through the moving groove 24 to fix the preset pull slider 7; the reset button 12 can slide to the position of the limiting groove 19 through the moving groove 24 to push the middle pull slider 9 out of the limiting groove 19. The knob 13 and the reset button 12 are fixed.

[0063] The fixing knob 13 is fixed to the bottom of the preset tension slider 7 through a threaded connection. By rotating (such as loosening and tightening a screw), the fixing knob 13 increases the contact pressure with the device housing 1, thereby achieving the purpose of locking the preset tension slider 7.

[0064] The reset button 12 is installed in a through hole in the spring receiving groove 22 as a component that can move up and down. The upper end of the reset button 12 is a flat structure with a structural area larger than the through hole area, and will not loosen or fall. The reset button 12 is in a state of being suspended in the limiting groove 19.

[0065] When the middle pull slider 9 enters the limiting groove 19, the state at this time is: the flat structure at the upper end of the reset button 12 is below the middle pull slider 9. Just push up the lower end of the reset button 12, the upper end structure can push the middle pull slider 9 out of the limiting groove 19, and then complete the reset of the middle pull slider 9.

[0066] The preset pulling slider 7 is provided with a slope guide structure 20 ; the slope guide structure 20 is provided with a guide slope 21 and a spring receiving groove 22 , the middle pulling slider 9 slides through the guide slope 21 and falls into the limiting groove 19 , and the spring receiving groove 22 is used to accommodate the pulling spring 11 .

[0067] Embodiment 2:

[0068] Those skilled in the art may understand this embodiment as a more specific description of Embodiment 1.

[0069] The present embodiment relates to a pull-back value testing device and a testing method when the wire is in a connected state, and is particularly aimed at measuring the pull-back force value of the wire after installation in a narrow space of an electrical cabinet.

[0070] This embodiment provides a handheld device and a detection method for checking the pullback value of a wire in a connected state, comprising: a device housing 1, a device lining 2, a pressure spring 3, a pressure pin 4, a dynamic pressure plate 5, an internal connecting rod 6, a preset tension slider 7, a tension scale plate 8, an intermediate pull slider 9, a device base 10, a tension spring 11, a reset button 12, and a fixed knob 13. The pressure spring 3, the pressure pin 4, and the dynamic pressure plate 5 constitute a wiring harness clamp. The tension scale plate 8 is a transparent tension scale plate. The reset button 12 is a tension spring reset button. The fixed knob 13 is a preset tension slider fixed knob.

[0071] The device is provided with a device shell 1 and a device lining 2. A transparent tension scale plate 8 is provided above the device shell 1. The preset tension slider 7 and the middle pulling slider 9 are both marked with indicator lines.

[0072] The left and right sides of the device shell 1 and the device lining 2 are provided with concave and convex grooves as guide rails, and the device lining 2 moves linearly along the grooves on the inner side of the device shell 1.

[0073] A dynamic pressure plate 5 is provided at the front end of the device liner 2 , a pressure spring 3 is provided inside the dynamic pressure plate 5 , and the pressure latch 4 fixes the dynamic pressure plate 5 and the pressure spring 3 to the front of the device housing 1 .

[0074] The front end of the internal connecting rod 6 is fixedly connected to the inner lining 2 of the device, and the internal connecting rod 6 and the front end of the intermediate pulling slider 9 are provided with threaded holes and corresponding threads for threaded connection, and the rear end of the intermediate pulling slider 9 is fixed to the tension spring 11, and the rear end of the tension spring 11 is fixedly connected to the device base 10.

[0075] The preset tension slider 7 is installed in the middle slide groove of the device housing 1 , and the fixing knob 13 of the preset tension slider is fixed below the preset tension slider 7 .

[0076] A through hole is provided between the preset pulling slider 7 and the internal connecting rod 6 , and the internal connecting rod 6 is placed in the middle hole of the preset pulling slider 7 , so as to enable the middle pulling slider 9 to slide forward and backward.

[0077] The reset button 12 of the tension spring is fixed below the preset tension slider 7 .

[0078] When the device of this embodiment is used: refer to the tension scale plate 8, adjust the preset tension slider 7 to the scale of the required tension value, rotate the fixing knob 13 clockwise to lock the preset tension slider 7, pull down the pressure pin 4, put the wire to be tested into the wire harness groove 17 of the dynamic pressure plate 5 and the static pressure plate 15, and pull the device housing 1 backward.

[0079] When the device of this embodiment works: Figure 2 and Figure 3 As shown, when the device housing 1 moves backward, the middle pulling slider 9 moves accordingly. When the middle pulling slider 9 reaches the position of the preset pulling slider 7, the set pulling force value is reached, and the middle pulling slider 9 will enter the limiting groove 19 in the preset pulling slider 7, making a knocking sound, that is, the set pulling force value is reached and it cannot be pulled any further.

[0080] When the device of this embodiment is used again: when it is necessary to measure again, Figure 4 As shown, the reset button 12 of the tension spring is pushed upward, and the middle pull slider 9 is pushed out of the limit groove 19 of the preset tension slider 7, and the tension spring 11 resets the middle pull slider 9. Then adjust the preset tension slider 7 to the scale of the required tension value again, rotate the fixing knob 13 clockwise to lock the preset tension slider 7, pull down the pressure pin 4, put the wire to be tested into the dynamic pressure plate 5 of the wiring harness clamp, and pull the device housing 1 backward.

[0081] Embodiment 3:

[0082] Those skilled in the art may understand this embodiment as a more specific description of Embodiment 1.

[0083] The present embodiment provides a handheld device and detection method for checking the pullback value when the wire is connected, including: a device shell, a device lining, a wire harness clamp pressure spring, a wire harness clamp pressure pin, a wire harness clamp dynamic pressure plate, an internal connecting rod, a preset tension slider, a transparent tension scale plate, an intermediate pull slider, a device base, a tension spring, a tension spring reset button, and a preset tension slider fixing knob.

[0084] Furthermore, a groove is provided above the device housing, and a transparent tension scale plate is installed in the groove, which can be pulled out at any time for easy replacement, and the preset tension slider and the middle pulling slider are both marked with indicator lines.

[0085] Furthermore, the device shell and the device lining are provided with concave and convex grooves on the left and right sides, and the device shell and the device lining can be fitted with each other to ensure linear motion when moving forward and backward.

[0086] Furthermore, a groove is provided in the wire harness clamp dynamic pressure plate, and the wire harness clamp pressure pin is inserted into the wire harness clamp pressure spring and fixed in the wire harness clamp dynamic pressure plate. At the same time, the wire harness clamp dynamic pressure plate is lifted up by the wire harness clamp pressure spring to form a wire harness clamp with the front end head of the device lining.

[0087] Furthermore, the preset pulling slider is provided with a through hole, the internal connecting rod is placed in the middle hole of the preset pulling slider, the internal connecting rod is fixed to the front end of the middle pulling slider, and the rear end of the middle pulling slider is fixed to the pulling spring for the middle pulling slider to slide back and forth.

[0088] Furthermore, an empty slot is provided below the device shell and the device lining, and the preset tension fixing knob and the preset tension slider move linearly in the empty slot, and the preset tension slider is fixed to the preset force indication scale position of the transparent tension scale plate in the empty slot through the preset tension fixing knob.

[0089] Furthermore, a groove is provided in the preset pulling force slider, and a knocking sound is heard when the intermediate pulling slider moves into the groove, indicating that the pulling force has reached the required pulling force value.

[0090] Furthermore, the tension spring reset button is installed below the preset tension slider and can move vertically, and is used to push out the middle pulling slider into the groove, reset the tension, and continue the next use.

[0091] In order to check the tightness of the wire in a connected state, a stable, convenient, reliable, simple and practical pull-back force measuring device is provided. The device of this embodiment, through the structural design of the main body and the clamp design, allows the operator to hold it in a narrow electrical cabinet to measure the pull-back force value of the wire in a connected state, thereby solving the problem of misjudgment caused by inspectors measuring the tightness of the wire in a connected state by hand.

[0092] The device of this embodiment is small in size and light in weight, and an operator can directly hold it and enter the interior of an electrical cabinet to perform the operation of measuring the pull-back force value.

[0093] The device of this embodiment is easy to operate, and there will be a reminder when the tension value is reached: a preset tension slider and an intermediate pulling slider are provided inside the device. The preset tension slider is fixed to the tension scale value to be reached through a preset tension fixing knob, and the clamp is clamped at the terminal to be measured. When the tension reaches the required tension value, the intermediate pulling slider enters the groove of the preset tension slider, a knocking sound is heard, and it cannot be pulled.

[0094] The device of this embodiment is easy to reset: when the next measurement is performed, the tension spring reset button can be pushed up to reset the middle pull slider in the preset tension slider groove, and the next measurement can be continued, thereby improving the convenience and practicality of the measurement.

[0095] The device of the present invention can measure the pull-back force of the wire in a connected state in a narrow environment inside an electrical cabinet, so as to ensure that the wiring meets the installation standards and avoids looseness.

[0096] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0097] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A handheld device for testing the pullback value of a wire in a connected state, characterized in that: include: A device housing (1) and a wiring harness clamp assembly, wherein the device housing (1) and the wiring harness clamp assembly are capable of relative movement; A preset tension slider (7) and an intermediate pulling slider (9) are slidably arranged in the device housing (1); the intermediate pulling slider (9) is connected to the device housing (1) via a tension spring (11), and the harness clamp assembly is connected to the intermediate pulling slider (9); a locking member and a reset member are arranged on the device housing (1); During inspection: the preset tension slider (7) is slid to a preset inspection position, fixed to the device housing (1) by the locking member, the device housing (1) is pulled, and the intermediate pulling slider (9) moves within the device housing (1). When it moves to the preset tension slider (7), it is limited and fixed by the preset tension slider (7); the reset member can release the limited and fixed state of the intermediate pulling slider (9) to reset it.

2. The handheld device for testing the pullback value of a wire in a connected state according to claim 1, characterized in that: The handheld device also includes: a device lining (2); A sliding groove (14) is provided in the device housing (1), the device lining (2) is slidably arranged in the sliding groove (14), and the wiring harness clamp assembly is connected to the device lining (2); The preset pulling force slider (7) and the intermediate pulling slider (9) are slidably arranged in the sliding groove (14).

3. The handheld device for testing the pullback value of a wire in a connected state according to claim 2, characterized in that: The wiring harness clamp assembly comprises: a pressure spring (3), a pressure latch (4), a dynamic pressure plate (5) and a static pressure plate (15); A mounting frame (16) is arranged on the inner lining (2) of the device, and the static pressure plate (15) and the dynamic pressure plate (5) are arranged on the mounting frame (16) in a relative manner; The dynamic pressure plate (5) is pressed against the static pressure plate (15) by the pressure spring (3), the pressure latch (4) is connected to the dynamic pressure plate (5), and the pressure latch (4) can pull the dynamic pressure plate (5) away from the static pressure plate (15); The dynamic pressure plate (5) and the static pressure plate (15) are both provided with a wire harness groove (17) for clamping the wire harness.

4. The handheld device for testing the pullback value of a wire in a connected state according to claim 2, characterized in that: A device base (10) is provided on the device housing (1); The intermediate pulling slide block (9) is connected to the device base (10) via the tension spring (11); The harness clamp assembly and the device base (10) are respectively located at two ends of the device housing (1), and the intermediate pulling slider (9) is located between the preset pulling slider (7) and the device base (10).

5. The handheld device for testing the pullback value of a wire in a connected state according to claim 4, characterized in that: The wiring harness clamp assembly is connected to the middle pulling slider (9) via an internal connecting rod (6); The preset pulling force slider (7) is provided with a through hole (18), and the internal connecting rod (6) passes through the through hole (18) to be connected with the middle pulling slider (9).

6. The handheld device for testing the pullback value of a wire in a connected state according to claim 2, characterized in that: The preset pulling force slider (7) is provided with a limiting groove (19), and the limiting groove (19) is used to limit and fix the intermediate pulling slider (9); when the intermediate pulling slider (9) moves to the limiting groove (19), it can be engaged in the limiting groove (19).

7. The handheld device for testing the pullback value of a wire in a connected state according to claim 6, characterized in that: The locking member is a fixed knob (13), and the reset member is a reset button (12); A movable groove (24) is provided on the device housing (1) along the length direction of the sliding groove (14), the movable groove (24) is located below the preset tension slider (7), and the fixed knob (13) and the reset button (12) are slidably arranged in the movable groove (24); The fixing knob (13) can slide to the position of the preset tension slider (7) through the moving groove (24) to fix the preset tension slider (7); The reset button (12) can slide to the position of the limiting groove (19) through the movable groove (24) to push the intermediate pulling slider (9) out of the limiting groove (19).

8. The handheld device for testing the pullback value of a wire in a connected state according to claim 6, characterized in that: The preset tension slider (7) is provided with a slope guide structure (20); The slope guide structure (20) is provided with a guide slope (21) and a spring receiving groove (22); the intermediate pulling slider (9) slides through the guide slope (21) and falls into the limiting groove (19); and the spring receiving groove (22) is used to receive the tension spring (11).

9. The handheld device for testing the pullback value of a wire in a connected state according to claim 2, characterized in that: An observation slot (23) is provided on the device housing (1) along the length direction of the sliding slot (14), and the observation slot (23) is used to observe the sliding of the preset pulling slider (7) and the intermediate pulling slider (9); A tension scale plate (8) is provided on the device housing (1) along the length direction of the observation slot (23), and indicator lines are provided on both the preset tension slider (7) and the intermediate pulling slider (9), and the indicator lines are used to align with the scale lines of the tension scale plate (8).

10. The handheld device for testing the pullback value of a wire in a connected state according to claim 9, characterized in that: The device housing (1) is provided with a mounting groove, and the tension scale plate (8) is detachably mounted in the mounting groove.

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