Threading machine with measurable lead length

Abstract

The utility model discloses a threading machine with measurable lead length, which comprises a shell, a lead, a take-up reel and a driving device, the take-up reel can rotate relative to the shell, the lead is collected in the take-up reel, one end of the lead passes through the driving device, the driving device is used for driving the lead to move, take-up and pay-off, and the take-up reel is pushed and pulled to rotate in the process of moving, take-up and pay-off of the lead. A display module and an induction unit are arranged on the shell, a signal unit matched with the induction unit in an induction mode is arranged on the take-up reel, the induction unit is electrically connected with the display module, and when the driving device drives the lead to move, take-up and pay-off and the take-up reel rotates relative to the shell, the induction unit inducts the signal unit and displays the signal unit through the display module. The lead length displayed by the display module is convenient for a user to know the length and the specific position of the lead during actual operation, so that the operation is convenient.

Description

Technical Field

[0001] The utility model relates to a threading machine, in particular to a threading machine with measurable lead length. Background Art

[0002] In modern building installation projects, it is inevitable to thread the pipeline, such as laying wires in metal pipes, plastic pipes and composite pipes. The current threading method is manual threading, which is difficult and inconvenient.

[0003] For this reason, a threading machine has appeared on the market, which can perform electric threading to improve the convenience of threading. For example, the Chinese utility model patent CN212221998U discloses an automatic threading machine, which includes a housing, a take-up disk, a lead, a synchronous belt, an anti-slip sleeve, a rotating disk and a driving mechanism for driving the rotating disk to rotate. The lead is wound around the take-up disk, and the synchronous belt is arranged close to the take-up disk and interacts with the anti-slip sleeve to make the lead drive the take-up disk to rotate freely to achieve the purpose of feeding and receiving the lead. The driving mechanism includes a motor and a planetary gear set, the planetary gear set is installed at the output end of the motor, and the planetary gear set is connected to the rotating disk through a tripod mounting seat. The anti-slip sleeve is installed outside the rotating disk and outputs traction at the same time as the synchronous belt and the running line speed is consistent.

[0004] However, the current control of the wire pulling length of the wire threading machine is mainly manual real-time observation and control, which requires continuous operation and constant observation by the user. This makes the user unclear about the specific length and position of the lead wire (receiving and sending) during actual operation, causing inconvenience to the user. Utility Model Content

[0005] Based on the problem that the control of the wire pulling length of the above-mentioned threading machine is mainly manual real-time observation and control, and the specific length and position of the lead wire are unclear during operation, the utility model provides a threading machine with measurable lead wire length.

[0006] The technical solution adopted by the utility model to solve the above technical problems is: a wire threading machine with measurable lead length, comprising a shell, a lead, a take-up reel and a driving device, the take-up reel can rotate relative to the shell, the lead is collected on the take-up reel, and one end of the lead passes through the driving device, the driving device is used to drive the lead to move and retract, and the take-up reel is pushed and pulled to rotate during the movement and retraction of the lead, the shell is provided with a display module and a sensing unit, the take-up reel is provided with a signal unit that cooperates with the sensing unit for induction, the sensing unit is electrically connected to the display module, when the driving device drives the lead to move and retract and the take-up reel rotates relative to the shell, the sensing unit senses the signal unit and displays it through the display module.

[0007] A further preferred technical solution of the utility model is: a cavity is provided in the shell, the driving device and the take-up reel are both arranged in the shell, and an opening is provided on the shell for one end of the lead wire to extend out.

[0008] A further preferred technical solution of the utility model is: the induction unit is a Hall sensor fixed on the housing, and the signal unit is at least one magnet fixed on the take-up drum and rotates with the take-up drum.

[0009] A further preferred technical solution of the utility model is: the sensing unit is a photoelectric switch sensor fixed on the housing.

[0010] A further preferred technical solution of the utility model is: the driving device includes a driving motor, an output shaft driven to rotate by the driving motor, and a lead wire retracting and releasing mechanism for retracting and releasing the lead wire by friction force, the lead wire retracting and releasing mechanism is connected to the output shaft, and the rotation of the output shaft drives the movement to retract and release the lead wire, and the driving motor, the lead wire retracting and releasing mechanism and the wire reel are arranged in sequence from right to left along the axial direction of the output shaft.

[0011] A further preferred technical solution of the utility model is: the lead wire retracting and releasing mechanism comprises a rotating disk, a synchronous sleeve and a synchronous belt assembly; the rotating disk is sleeved on the output shaft and rotates coaxially with the output shaft; the synchronous sleeve is sleeved on the rotating disk and rotates coaxially with the rotating disk; the synchronous belt assembly is relative to the synchronous sleeve and is driven to move by the rotating disk; the lead wire passes between the synchronous sleeve and the synchronous belt assembly and is synchronously driven by the synchronous sleeve and the synchronous belt assembly to move and be retracted.

[0012] A further preferred technical solution of the utility model is: the display module is arranged in the shell, the display module includes a control circuit board and a display screen installed on the control circuit board, the shell is provided with a window opposite to the display screen for exposing the display screen, and a transparent cover is installed at the window.

[0013] A further preferred technical solution of the utility model is: the take-up reel is mounted on the output shaft, and the take-up reel can rotate relative to the output shaft, a bearing is provided between the take-up reel and the output shaft, the shell includes a flat cylindrical main shell and a handle, the handle is arranged on the outer circumferential surface of the main shell, and a cavity is provided in the main shell for installing the driving device and the take-up reel, and the display module and the opening are located on the front side of the handle.

[0014] A further preferred technical solution of the utility model is: a length compensation device for compensating for the length difference of different turns of lead wire collected in the take-up reel is provided on the housing.

[0015] A further preferred technical solution of the utility model is as follows: the synchronous belt assembly includes a first mounting plate, a synchronous belt, a driving pulley, a driven pulley, a second mounting plate and a tension adjuster, the first mounting plate and the second mounting plate are both fixed to the housing, and there is a spacing between the first mounting plate and the second mounting plate, the synchronous belt is installed between the first mounting plate and the second mounting plate, the driving pulley and the driven pulley are both installed in the synchronous belt and mesh with the synchronous belt for transmission, a transmission gear is coaxially connected to the driving pulley, a circle of outer gear ring is provided on the rotating disk, the transmission gear meshes with the outer gear ring for transmission, and the driven pulley is meshed with the outer gear ring for transmission. The driven pulley includes a first driven pulley that can move relative to the first mounting plate and the second mounting plate, the tension adjuster includes a displacement frame limited to move in a straight line, an adjusting screw and an adjusting nut limited to rotate in a shell, the adjusting nut is mounted on the displacement frame and fixed relatively to the displacement frame, the adjusting screw is threadedly connected to the adjusting nut, the first driven pulley is connected to the displacement frame and moves synchronously with the displacement frame, and when the adjusting screw rotates, the adjusting nut drives the displacement frame and the first driven pulley to move and adjust the tightness of the synchronous belt, and an adjustment port is provided on the shell for inserting a tool to rotate the adjusting screw.

[0016] Compared with the prior art, the utility model has the advantages that a display module and a sensing unit are arranged on the shell, a signal unit that cooperates with the sensing unit is arranged on the take-up reel, the sensing unit is electrically connected to the display module, and when in use, a driving device drives the lead to move and retract, and during the process of retraction and extension, the lead pushes and pulls the take-up reel to rotate, the sensing unit on the shell senses the signal unit that rotates synchronously with the take-up reel, and transmits the signal to the display module, the stroke length of the lead is obtained through internal calculation of the display module, and displayed through the display module, when the lead is retracted, the number in the display module changes in a decreasing manner, and when the lead is delivered, the number in the display module changes in an increasing manner, and the intuitive data displayed by the display module makes it easy for the user to understand the length and specific position of the lead during actual operation, and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be described in further detail below in conjunction with the accompanying drawings and preferred embodiments, but those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be used as a limitation on the scope of the present invention. In addition, unless otherwise specified, the drawings are only schematically representing the composition or structure of the described object and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0018] Figure 1 The overall structure of the threading machine Figure 1 ;

[0019] Figure 2 The overall structure of the threading machine Figure 2 ;

[0020] Figure 3 This is a disassembled diagram of the shell;

[0021] Figure 4 Schematic diagram of the internal structure of the shell;

[0022] Figure 5 It is a schematic diagram of the display module structure;

[0023] Figure 6 It is a structural schematic diagram of the take-up reel and the driving device;

[0024] Figure 7 The structure diagram of the lead wire retracting and releasing mechanism Figure 1 ;

[0025] Figure 8 The structure diagram of the lead wire retracting and releasing mechanism Figure 2 ;

[0026] Fig. 9 It is an exploded diagram of the lead wire retracting and releasing mechanism;

[0027] Fig.10 The exploded view of the take-up reel, rotating disc, output shaft and synchronizing ring;

[0028] Fig.11 A cross-sectional diagram of a threading machine.

[0029] In the figure: 1, shell; 2, handle; 3, wire tube; 4, lead; 5, opening; 6, adjustment port; 7, transparent cover; 8, right half shell; 9, left half shell; 10, lead wire retracting and releasing mechanism; 11, guide tube; 12, display module; 13, take-up reel; 14, Hall sensor; 15, synchronous belt assembly; 16, rotating disk; 17, control circuit board; 18, display screen; 19, outer gear ring; 20, transmission gear; 21, synchronous sleeve ring; 22, displacement Frame; 23, adjusting screw; 24, assembly groove; 25, adjusting nut; 26, first mounting plate; 27, track; 28, synchronous belt; 29, lead groove; 30, second mounting plate; 31, first driven pulley; 32, second driven pulley; 33, driving pulley; 34, output shaft; 35, boss; 36, convex tooth; 37, slot; 38, tooth groove; 39, cavity; 40, magnet; 41, motor cavity; 42, bearing; 43, main housing. DETAILED DESCRIPTION

[0030] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It will be appreciated by those skilled in the art that these descriptions are merely illustrative and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0031] It should be noted that like reference numerals denote similar items in the following drawings, and thus, once an item is defined in one drawing, it may not be further defined or explained in subsequent drawings.

[0032] Figure 1-Figure 11 As shown, a wire threading machine with measurable lead wire length includes a housing 1, a lead wire 4, a wire take-up drum 13 and a driving device. The wire take-up drum 13 can rotate relative to the housing 1. The lead wire 4 is collected on the wire take-up drum 13, and one end of the lead wire 4 passes through the driving device. The driving device is used to drive the lead wire 4 to move and retract. During the movement and retraction of the lead wire 4, the wire take-up drum 13 is pushed and pulled to rotate.

[0033] Preferably, a cavity is provided in the housing 1, the drive device and the take-up drum 13 are both arranged in the housing 1, and an opening 5 is provided on the housing 1 for one end of the lead wire 4 to extend out. The drive device and the take-up drum 13 are arranged in the housing 1 to make the overall structure of the stringing machine more compact.

[0034] Fig.11 As shown, preferably, the driving device includes a driving motor, an output shaft 34 driven to rotate by the driving motor, and a lead wire retracting mechanism 10 for retracting and releasing the lead wire 4 by friction. The lead wire retracting mechanism 10 is connected to the output shaft 34, and the rotation of the output shaft 34 drives the movement to retract and release the lead wire 4. The driving motor, the lead wire retracting mechanism 10 and the wire reel 13 are arranged in sequence from left to right along the axial direction of the output shaft 34, so that the arrangement of the components in the shell 1 is more compact, thereby reducing the overall volume and making the entire body smaller.

[0035] The drive motor is fixed on the housing 1, and a planetary gear reducer is fixedly connected to the drive motor. The motor shaft of the drive motor is connected to the input end of the planetary gear reducer, and the output shaft 34 can be the output end of the planetary gear reducer for outputting rotational power. A motor cavity 41 for installing the drive motor is provided in the housing 1, and the drive motor is not shown in the drawings.

[0036] Figure 6-Figure 10 As shown, preferably, the lead wire retracting and releasing mechanism 10 includes a rotating disk 16, a synchronous sleeve 21 and a synchronous belt assembly 15. The rotating disk 16 is sleeved on the output shaft 34 and rotates coaxially with the output shaft 34. The synchronous sleeve 21 is sleeved on the rotating disk 16 and rotates coaxially with the rotating disk 16. The synchronous belt assembly 15 is relative to the synchronous sleeve 21 and is driven to move by the rotating disk 16. The lead wire 4 passes between the synchronous sleeve 21 and the synchronous belt assembly 15 and is synchronously driven by the synchronous sleeve 21 and the synchronous belt assembly 15 to move and retract.

[0037] Preferably, there is a first center hole on the rotating disk 16, and the rotating disk 16 is mounted on the output shaft 34 through the first center hole. The side wall of the output shaft 34 is provided with a section extending in the axial direction, and the inner wall of the first center hole is provided with a plane that is snap-fitted with the section. When the rotating disk 16 is mounted on the output shaft 34, the plane is snap-fitted with the section, so that the rotating disk 16 and the output shaft 34 are restricted in relative rotation, and the output shaft 34 can drive the rotating disk 16 to rotate coaxially when rotating.

[0038] Fig.10 As shown, preferably, an axially protruding boss 35 is provided on the rotating disk 16, and a plurality of convex teeth 36 are evenly arranged upward on the outer circumference of the boss 35. A slot 37 for inserting the boss 35 is provided at the center of the synchronous collar 21, and a plurality of tooth grooves 38 matching with the convex teeth 36 are provided on the inner side wall of the slot 37. When the synchronous collar 21 is sleeved on the rotating disk 16, the boss 35 is inserted into the slot 37, and the plurality of convex teeth 36 on the boss 35 are inserted into the corresponding tooth grooves 38, so that the synchronous collar 21 and the rotating disk 16 are restricted in relative rotation, and the rotating disk 16 can drive the synchronous collar 21 to rotate coaxially when rotating.

[0039] Fig. 9 As shown, preferably, the synchronous belt assembly 15 includes a first mounting plate 26, a synchronous belt 28, a driving pulley 33, a driven pulley, a second mounting plate 30 and a tension adjuster, the first mounting plate 26 and the second mounting plate 30 are fixedly connected to the housing 1 by screws, and there is a spacing between the first mounting plate 26 and the second mounting plate 30, the synchronous belt 28 is installed between the first mounting plate 26 and the second mounting plate 30, the driving pulley 33 and the driven pulley are both installed in the synchronous belt 28 and mesh with the synchronous belt 28 for transmission, the driving pulley 33 is coaxially connected with a transmission gear 20, a circle of outer gear ring 19 is provided on the rotating disk 16, the transmission gear 20 meshes with the outer gear ring 19 for transmission, the belt surface of the synchronous belt 28 is opposite to the outer peripheral surface of the synchronous ring 21, and the lead 4 passes between the belt surface of the synchronous belt 28 and the outer peripheral surface of the synchronous ring 21.

[0040] Figure 6-Figure 8 As shown, when the driving motor is started, the output shaft 34 drives the rotating disk 16 to rotate coaxially, the transmission gear 20 is driven to rotate by the outer gear ring 19, and the transmission gear 20 drives the active pulley 33 to rotate coaxially, so that the synchronous belt 28 runs. At the same time, the rotating rotating disk 16 drives the synchronous ring 21 to rotate coaxially. At this time, the synchronous ring 21 cooperates with the synchronous belt 28 to press the lead wire 4 passing through the middle and push the lead wire 4 forward to realize the retraction and release of the lead wire 4.

[0041] Preferably, a wire groove 29 for accommodating the wire 4 is provided on the belt surface of the synchronous belt 28 .

[0042] The driven pulley is mounted on the first mounting plate 26 and the second mounting plate 30 on both sides through the wheel shaft, and the driving pulley 33 is mounted between the first mounting plate 26 and the inner wall of the housing 1 through the wheel shaft.

[0043] Fig. 9 As shown, preferably, the driven pulley includes a first driven pulley 31 that can move relative to the first mounting plate 26 and the second mounting plate 30, and the first mounting plate 26 and the second mounting plate 30 are provided with a track 27 for the axle of the first driven pulley 31 to move. The tension adjuster includes a displacement frame 22, an adjusting screw 23 and an adjusting nut 25. The displacement frame 22 is arranged in the housing 1 and is limited to move relative to the housing 1 in a straight line. The adjusting screw 23 is limited in the housing 1 and can rotate relative to the housing 1. The adjusting nut 25 is mounted on the housing 1. The displacement frame 22 is relatively fixed with the displacement frame 22, the adjusting screw 23 is threadedly connected with the adjusting nut 25, the first driven pulley 31 is connected to the displacement frame 22 and moves synchronously with the displacement frame 22, when the adjusting screw 23 rotates, the adjusting nut 25 moves forward and backward along the length direction of the adjusting screw 23, and when the adjusting nut 25 moves forward and backward, it drives the displacement frame 22 and the first driven pulley 31 to move, so that the first driven pulley 31 adjusts the tightness of the synchronous belt 28, and an adjusting port 6 is provided on the housing 1 for inserting a tool to rotate the adjusting screw 23.

[0044] A slide groove is provided on the inner wall of the housing 1, and the displacement frame 22 is slidably arranged in the slide groove, and the second mounting plate 30 blocks the outer side of the displacement frame 22 to limit the displacement frame 22 from leaving the slide groove, so that the displacement frame 22 moves along the slide groove in a straight line.

[0045] The displacement frame 22 is provided with an assembly groove 24, and the adjusting nut 25 is installed in the assembly groove 24, and the side is fitted with the inner wall of the assembly groove 24 to limit its own rotation relative to the displacement frame 22. The displacement frame 22 is provided with a hole passing through the assembly groove 24, and the adjusting screw 23 passes through the hole and is threadedly connected with the adjusting nut 25 in the assembly groove 24.

[0046] Two limit plates are provided on the inner wall of the housing 1 , and the head of the adjusting screw 23 is located between the two limit plates. The movement of the adjusting screw 23 is limited by the two limit plates, so that the adjusting screw 23 can only rotate relative to the housing 1 .

[0047] When the adjusting screw 23 is rotated by a tool, the adjusting nut 25 cannot rotate, so that the adjusting nut 25 can only move linearly along the length direction of the adjusting screw 23. During the movement, the adjusting nut 25 drives the displacement frame 22 and the first driven pulley 31 to move synchronously.

[0048] Preferably, the driven pulley includes two second driven pulleys 32 , the two second driven pulleys 32 are located between the driving pulley 33 and the first driven pulley 31 , and the two second driven pulleys 32 are fixedly mounted between the first mounting plate 26 and the second mounting plate 30 and do not move.

[0049] Preferably, the wire take-up drum 13 is sleeved on the output shaft 34 and is limited by screws. A bearing 42 is provided between the wire take-up drum 13 and the output shaft 34 , and the wire take-up drum 13 can rotate relative to the output shaft 34 .

[0050] The housing 1 is provided with a display module 12 and a sensing unit, the take-up reel 13 is provided with a signal unit that is inductively matched with the sensing unit, and the sensing unit is electrically connected to the display module 12 .

[0051] Preferably, the sensing unit is a Hall sensor 14 fixed on the housing 1, and the signal unit is at least one magnet 40 fixed on the take-up reel 13 and rotates synchronously with the take-up reel 13. The Hall sensor 14 is a Hall PCBA.

[0052] Figure 3 , Fig.10 As shown, preferably, the number of the magnets 40 is six, and the six magnets 40 are arranged in a circular array on one side end surface of the take-up drum 13 with the rotation center of the take-up drum 13 as the center, and the Hall sensor 14 is fixed on the inner wall of the housing 1.

[0053] When the driving device drives the lead wire 4 to move for winding or releasing the wire, the moving lead wire 4 pushes and pulls the winding reel 13 to rotate forward or reverse relative to the shell 1, and the sensing unit on the shell 1 senses the signal unit rotating synchronously with the winding reel 13, and transmits the signal to the display module 12. The stroke length of the lead wire 4 is obtained through internal calculation of the display module 12 and displayed through the display module 12. When the lead wire 4 is wound up, the numbers in the display module 12 are decreasing, and when the lead wire 4 is delivered, the numbers in the display module 12 are increasing. The intuitive data displayed by the display module 12 makes it easy for the user to understand the length and specific position of the lead wire 4 during actual operation, which facilitates operation.

[0054] The number in the display module 12 can be determined to decrease or increase by driving the motor to output forward or reverse power.

[0055] Preferably, the display module 12 is installed in the shell 1, and the display module 12 includes a control circuit board 17 and a display screen 18 installed on the control circuit board 17. The shell 1 is provided with a window opposite to the display screen 18 for exposing the display screen 18, and a transparent cover 7 is installed at the window, and the data displayed on the display screen 18 is transmitted through the transparent cover 7.

[0056] Figure 2As shown, preferably, the housing 1 includes a flat cylindrical main housing 43 and a handle 2, the handle 2 is arranged on the outer circumference of the main housing 43, the main housing 43 has a cavity for installing the drive device and the take-up reel 13, the display module 12 and the opening 5 are located on the front side of the handle 2, which is convenient for operation and observation, and the overall structure is compact. The display module 12 and the opening 5 are not limited to being arranged on the front side of the handle 2, and can also be arranged at other positions.

[0057] Preferably, a wire tube 3 is fixed on the opening 5 , and the lead wire 4 passes through the wire tube 3 .

[0058] Preferably, the wire take-up drum 13 is a hollow structure, and a cavity 39 is provided on the end surface of the wire take-up drum 13 opposite to the lead wire take-up and release mechanism 10 for the lead wire 4 to extend out and be connected to the lead wire take-up and release mechanism 10 .

[0059] A guide tube 11 is provided between the wire take-up reel 13 and the lead wire take-up and release mechanism 10 , and between the lead wire take-up and release mechanism 10 and the wire tube 3 . The guide tube 11 is used for allowing the lead wire 4 to pass through and guide the direction of the lead wire 4 .

[0060] The lead wire 4 has a certain hardness and elasticity. When the lead wire 4 is collected in the wire take-up drum 13, the lead wire 4 will be stretched out and fit with the cavity wall of the inner cavity of the wire take-up drum 13 to form a coil.

[0061] Preferably, a length compensation device for compensating for the length difference of different turns of lead wire 4 collected in the take-up reel 13 is provided on the housing 1. As the number of turns wound in the take-up reel 13 decreases, the radius from the coil to the center of the take-up reel 13 becomes larger, and as the number of turns wound in the take-up reel 13 increases, the radius from the coil to the center of the take-up reel 13 becomes smaller, so that the measurement of the length of the lead wire 4 is performed by sensing the magnet 40 on the take-up reel 13 by the Hall sensor 14, and the error is compensated by providing a length compensation device.

[0062] For example, assuming that the difference between each circle is constant, the difference in circumference of adjacent circles is a, the length compensation device is a counting device electrically connected to the display module 12, the length compensation device is used to record the number of circles of the take-up drum 13 in the forward or reverse direction and transmit a signal to the display module 12, during the process of unwinding, the number of circles wound in the take-up drum 13 decreases, at this time, every time the take-up drum 13 rotates one circle, the length compensation device transmits a signal to the display module 12, and the display module 12 adds a to the calculated value to compensate for the difference, during the process of winding, the number of circles wound in the take-up drum 13 increases, at this time, every time the take-up drum 13 rotates one circle, the length compensation device transmits a signal to the display module 12, and the display module 12 subtracts a from the calculated value to compensate for the difference.

[0063] Preferably, the housing 1 comprises a left half shell 9 and a right half shell 8, and the left half shell 9 and the right half shell 8 are fixed by screws.

[0064] For the sensing unit, this patent has another solution, for example:

[0065] The sensing unit is a photoelectric switch sensor fixed on the housing 1 .

[0066] The above is an introduction to the wire threading machine with measurable lead length provided by the utility model. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the utility model and its core ideas. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A wire threading machine with measurable lead length, comprising a housing, a lead, a take-up reel and a driving device, wherein the take-up reel can rotate relative to the housing, the lead is collected on the take-up reel, and one end of the lead passes through the driving device, the driving device is used to drive the lead to move and retract, and the take-up reel is pushed and pulled to rotate during the movement and retraction of the lead, characterized in that: The shell is provided with a display module and a sensing unit, the take-up reel is provided with a signal unit that cooperates with the sensing unit for sensing, the sensing unit is electrically connected to the display module, and when the driving device drives the lead to move and retract and the take-up reel rotates relative to the shell, the sensing unit senses the signal unit and displays it through the display module.

2. The wire threading machine with measurable lead length according to claim 1, characterized in that: A cavity is arranged in the shell, the driving device and the wire take-up drum are arranged in the shell, and an opening is arranged on the shell for one end of the lead wire to extend out.

3. The wire threading machine with measurable lead length according to claim 1, characterized in that: The induction unit is a Hall sensor fixed on the housing, and the signal unit is at least one magnet fixed on the take-up reel and rotates with the take-up reel.

4. The wire threading machine with measurable lead length according to claim 1, characterized in that: The sensing unit is a photoelectric switch sensor fixed on the housing.

5. The wire threading machine with measurable lead length according to claim 2, characterized in that: The driving device includes a driving motor, an output shaft driven to rotate by the driving motor, and a lead wire retracting and releasing mechanism for retracting and releasing the lead wire by friction force. The lead wire retracting and releasing mechanism is connected to the output shaft and is driven by the rotation of the output shaft to retract and release the lead wire. The driving motor, the lead wire retracting and releasing mechanism and the wire reel are arranged in sequence from right to left along the axial direction of the output shaft.

6. The wire threading machine with measurable lead length according to claim 5, characterized in that: The lead wire retracting and releasing mechanism comprises a rotating disk, a synchronous sleeve and a synchronous belt assembly. The rotating disk is sleeved on the output shaft and rotates coaxially with the output shaft. The synchronous sleeve is sleeved on the rotating disk and rotates coaxially with the rotating disk. The synchronous belt assembly is relative to the synchronous sleeve and is driven to move by the rotating disk. The lead wire passes between the synchronous sleeve and the synchronous belt assembly and is synchronously driven by the synchronous sleeve and the synchronous belt assembly to move and retract.

7. The wire threading machine with measurable lead length according to claim 1, characterized in that: The display module is arranged in the shell, and the display module includes a control circuit board and a display screen mounted on the control circuit board. The shell is provided with a window opposite to the display screen for exposing the display screen, and a transparent cover is installed at the window.

8. The wire threading machine with measurable lead length according to claim 5, characterized in that: The take-up reel is mounted on the output shaft and can rotate relative to the output shaft. A bearing is provided between the take-up reel and the output shaft. The housing includes a flat cylindrical main housing and a handle. The handle is provided on the outer circumferential surface of the main housing. A cavity is provided in the main housing for installing a driving device and a take-up reel. The display module and the opening are located on the front side of the handle.

9. The wire threading machine with measurable lead length according to claim 1, characterized in that: The housing is provided with a length compensation device for compensating for the length difference of different loops of lead wire collected in the take-up reel.

10. The wire threading machine with measurable lead length according to claim 6, characterized in that: The synchronous belt assembly includes a first mounting plate, a synchronous belt, a driving pulley, a driven pulley, a second mounting plate and a tension adjuster. The first mounting plate and the second mounting plate are both fixed to the housing, and there is a spacing between the first mounting plate and the second mounting plate. The synchronous belt is installed between the first mounting plate and the second mounting plate. The driving pulley and the driven pulley are both installed in the synchronous belt and mesh with the synchronous belt for transmission. The driving pulley is coaxially connected with a transmission gear, and a circle of outer gear rings are provided on the rotating disk. The transmission gear meshes with the outer gear ring for transmission. The driven pulley includes a gear that can be relatively A first driven pulley moves between a mounting plate and a second mounting plate, and the tension adjuster includes a displacement frame limited to move in a straight line, an adjusting screw and an adjusting nut limited to rotate in a shell, the adjusting nut is mounted on the displacement frame and fixed relatively to the displacement frame, the adjusting screw is threadedly connected to the adjusting nut, the first driven pulley is connected to the displacement frame and moves synchronously with the displacement frame, and when the adjusting screw rotates, the adjusting nut drives the displacement frame and the first driven pulley to move to adjust the tightness of the synchronous belt, and an adjustment port is provided on the shell for inserting a tool to rotate the adjusting screw.

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