CN108967245A - Intelligent pet rope with Fang Zhuaidao mechanism - Google Patents

Abstract

The invention discloses an intelligent pet leash with an anti-drag mechanism, comprising: a handle end, provided with a control button, for sending a first indication signal to the collar end based on a detected trigger action for the control button; The collar end is used to send a first working signal to the anti-drag mechanism based on the first indication signal, and is also used to be put on the neck of the pet; the anti-drag mechanism is arranged between the collar end and the rope body The space is used to extend its own length based on the first working signal, so that the length of the smart pet rope is extended; the rope body is connected to the handle end and the anti-drag mechanism. The present invention achieves the purpose of adjusting the length of the rope body by prolonging the length of the anti-drag mechanism, plays the role of anti-drag, and ensures the personal safety of the pet owner.

Description

Smart Pet Leash with Anti-Drag Mechanism

technical field

The invention relates to the technical field of pet products, in particular to an intelligent pet leash with an anti-drag mechanism.

Background technique

The principle of the existing pet rope structure is basically the same as that of the steel tape. A scroll spring is installed on the inner core of the housing for placing the pet rope, and the pet rope is connected to the outside of the scroll spring. When the pet rope is subjected to external force, the pet rope protrudes out of the shell, and the radius of the scroll spring increases under the action of the tension of the pet rope, and produces elastic force due to elastic deformation; when the external force acting on the pet rope disappears, the scroll spring The elastic force pulls the pet rope back into the housing, thereby realizing the expansion and contraction of the pet rope.

In the above structure, the scroll spring is under stress and deformed for a long time, and the spring is prone to stress relaxation. Moreover, when the emergency stop pet rope is stretched, the rope is stuck, so the pulling force on the rope can increase linearly with the increase of the external force, thus causing the user to be easily pulled down when the pet suddenly runs, giving the user personal safety hazards.

Contents of the invention

In view of this, the purpose of the present invention is to propose a smart pet leash with an anti-drag mechanism.

Based on the above purpose, the present invention provides a smart pet leash with an anti-drag mechanism, including:

The handle end is provided with a control button, which is used to send a first indication signal to the collar end based on the detected trigger action for the control button;

The collar end is used to send a first working signal to the anti-drag mechanism based on the first indication signal, and is also used to be put on the pet's neck;

The anti-drag mechanism is arranged between the collar end and the rope body, and is used to extend its own length based on the first working signal, so that the length of the smart pet rope is extended;

The rope body is connected to the handle end and the anti-drag mechanism.

In one embodiment, the smart pet leash also includes:

a tension sensor, arranged at the collar end, for detecting the tension on the collar end;

The collar end is further configured to send a first working signal to the anti-drag mechanism when the pulling force is greater than a pulling force threshold and the first indication signal is received.

In one embodiment, the handle end is further provided with: an emergency button;

The handle end is further configured to send a second indication signal to the collar end when a trigger action for the emergency button is detected;

The collar end is also used to judge whether the anti-drag mechanism is working based on the second indication signal, and if yes, send a second working signal to the anti-drag mechanism to make the anti-drag mechanism shrink return to the original length; otherwise, the first working signal is not sent to the anti-drag mechanism, so that the anti-drag mechanism does not work.

The embodiment of the present invention also provides a smart pet leash, including:

The handle end is provided with a control button, which is used to send a first working signal to the anti-dripping mechanism based on the detected trigger action for the control button;

The collar end is used to put on the pet's neck;

The anti-drag mechanism is arranged between the collar end and the rope body, and is used to extend its own length based on the first working signal, so that the length of the smart pet rope is extended;

The rope body is connected to the handle end and the anti-drag mechanism.

In one embodiment, the smart pet leash also includes:

a tension sensor, arranged at the collar end, for detecting the tension on the collar end;

The handle end is further configured to send a first working signal to the anti-dripping mechanism when the pulling force is greater than a pulling force threshold and a trigger action on the control button is detected.

In one embodiment, the handle end is further provided with: an emergency button;

The handle end is also used to send a second working signal to the anti-drag mechanism if the anti-drag mechanism is working when the trigger action for the emergency button is detected, so that the anti-drag mechanism The inverted mechanism retracts to the original length;

If the anti-drag mechanism is not working, the first working signal is not sent to the anti-drag mechanism, so that the anti-drag mechanism does not work.

In one embodiment, the anti-drag mechanism includes:

The outer cylinder, the inner surface of the outer cylinder has an axial ejection track, a recovery track, and a radial first connecting track and a second connecting track connected between the ejection track and the recovery track Return-shaped guide rail, the recovery track is higher than the horizontal plane where the ejection track is located;

The motor is arranged on the outer surface of the outer cylinder;

an inner cylinder sleeved in the outer cylinder;

a spring disposed between the inner surface of the first end of the outer cylinder and the outer surface of the third end of the inner cylinder, the spring is stretched when the inner cylinder protrudes from the outer cylinder, when the inner cylinder extends into the outer cylinder, the spring is compressed;

The slider is arranged on the outer surface of the inner cylinder and can move in the return-shaped guide rail to drive the inner cylinder to expand and contract in the outer cylinder. The initial position of the slider in the return-shaped guide rail is a position of the recovery track near the first end;

A gear and a rack are arranged on the outer surface of the inner cylinder, and the gear is driven by the motor to drive the slider and the inner cylinder to move. When the slider is located in the first connecting track , the gear is separated from the rack, and when the slider is located in the second connecting track, the gear engages with the rack.

In one embodiment, the motor is a geared motor.

In one embodiment, the ejection track and the recovery track are wedge-shaped tracks with an inclination.

In an embodiment, the tension threshold includes at least two levels.

It can be seen from the above that the smart pet leash with an anti-drag mechanism provided by the present invention can trigger the control button on any occasion where the pet leash needs to be extended through the control button on the handle end, thereby controlling the anti-drag mechanism. The mechanism works, and the purpose of adjusting the length of the rope body is achieved by extending the length of the anti-drag mechanism, which plays the role of anti-drag and ensures the personal safety of the pet owner.

Description of drawings

Fig. 1 is a schematic structural diagram of a smart pet leash with an anti-drag mechanism provided by an embodiment of the present invention;

Fig. 2 is a structural schematic diagram of a smart pet leash with an anti-drag mechanism provided by another embodiment of the present invention;

Fig. 3 is a structural schematic diagram of a smart pet leash with an anti-drag mechanism provided by another embodiment of the present invention;

Fig. 4 is a schematic structural diagram of an anti-drag mechanism provided by an embodiment of the present invention;

Fig. 5 is another structural schematic diagram of an anti-drag mechanism provided by an embodiment of the present invention;

Fig. 6 is another structural schematic diagram of an anti-drag mechanism provided by an embodiment of the present invention;

Fig. 7 is a schematic diagram of force analysis of a slider of an anti-drag mechanism provided by an embodiment of the present invention;

Fig. 8 is a schematic diagram of force analysis of a slider of an anti-drag mechanism provided by an embodiment of the present invention;

Fig. 9 is a system block diagram of an anti-drag mechanism provided by an embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are to distinguish two entities with the same name but different parameters or parameters that are not the same, see "first" and "second" It is only for the convenience of expression, and should not be construed as a limitation on the embodiments of the present invention, which will not be described one by one in the subsequent embodiments.

Fig. 1 is a structural schematic diagram of a smart pet rope with an anti-drag mechanism shown in an embodiment of the present invention. As shown in Fig. 1, the smart pet rope includes: a collar end 10, a handle end 20, a rope body 30 and an anti-drag Pour body 50.

Wherein, the handle end 20 is connected with the rope body 30 for the pet owner to hold the smart pet rope, and the handle end 20 can be in any shape that is convenient for the pet owner to hold.

The handle end 20 is provided with a control button 201 for sending a first indication signal to the collar end 10 based on the trigger action of the user on the control button 201 . The transmission manner of the first indication signal may be wireless transmission.

The collar end 10 is used to send a first working signal to the anti-drag mechanism 50 based on the first indication signal from the handle end 20 . In actual use, the collar end 10 is also used to be put on the pet's neck.

The anti-drag mechanism 50 is arranged between the rope body 30 and the collar end 10, and is used to extend its own length based on the received first working signal, so that the whole rope body part of the smart pet rope is elongated.

The rope body 30 is connected between the anti-drag mechanism 50 and the handle end 20 .

The intelligent pet leash with the anti-drag mechanism provided in this embodiment can trigger the control button on any occasion where the pet leash needs to be extended through the control button provided on the handle end, thereby controlling the work of the anti-drag mechanism. Invert the length of the mechanism to achieve the purpose of adjusting the length of the rope body, play a role in preventing falling, and ensure the personal safety of the pet owner.

As shown in Figure 2, it is a schematic structural diagram of another smart pet leash with an anti-drag mechanism provided by the embodiment of the present invention. The difference between this embodiment and the embodiment shown in Figure 1 is that the smart pet leash provided by this embodiment Also includes: a tension sensor 40 .

Wherein, the tension sensor 40 is arranged on the collar end 10 for testing the tension on the collar end 10 . In this case, the collar end 10 judges whether the pulling force is greater than the preset pulling force threshold, and when the pulling force is greater than the pulling force threshold and receives the first indication signal from the handle end 20, it sends the first indication signal to the anti-drag mechanism 50. A working signal.

In an embodiment, the tension threshold can be set to different gears or levels based on actual needs, so as to correspond to different tension thresholds. For example, a larger pull threshold is for scenarios where adult users travel with pets, and a smaller pull threshold is for scenarios where children travel with pets. Then, when the collar end 10 receives the pulling force detected by the pulling force sensor 40 , it compares the pulling force with the currently set effective pulling force threshold.

In this embodiment, by setting the tension sensor, the anti-drag mechanism is controlled to work only when it is judged that the tension measured by the tension sensor is greater than the set threshold and the trigger action of the control button on the handle end by the user is detected, so as to avoid Malfunctions and unnecessary extension of the rope body when the pulling force is not enough to pull the threshold make the control of the smart pet rope more precise and optimize the user experience.

As shown in Figure 3, it is a schematic structural diagram of another smart pet rope with an anti-drag mechanism provided by the embodiment of the present invention. The difference between this embodiment and the embodiment shown in Figure 1 or Figure 2 is that the handle end 20 also An emergency button 202 is provided.

Then the handle end 20 is also used to send a second indication signal to the collar end 10 when a trigger action for the emergency button 202 is detected; the collar end 10 is also used to judge whether the anti-drag mechanism 50 is working based on the second indication signal, If the anti-drag mechanism 50 is working, then send the second working signal to the anti-drag mechanism 50, so that the inner tube 54 is retracted in the outer tube 51; The mechanism 50 sends a first working signal to keep the anti-dripping mechanism 50 in a non-working state.

In this embodiment, by setting the emergency button, it is possible to control the emergency retraction of the anti-drag mechanism without the extension of the anti-drag mechanism. Pull back your pet to keep your pet safe.

In another embodiment, as shown in FIG. 1 , a schematic structural diagram of another smart pet leash with an anti-drag mechanism is provided. The smart pet leash includes: a collar end 10, a handle end 20, a rope body 30 and Anti-drag mechanism 50.

The difference between this embodiment and the embodiment shown in FIG. 1 is that: the handle end 20 is provided with a control button 201 for sending a first working signal to the anti-dripping mechanism 50 based on the detected trigger action on the control button 201 .

The collar end 10 is used to wrap around the pet's neck.

The anti-drag mechanism 50 is arranged between the rope body 30 and the collar end 10, and is used to extend its own length based on the received first working signal, so that the whole rope body part of the smart pet rope is elongated.

That is to say, in this embodiment, the first working signal is sent from the handle end 20 to the anti-dropping mechanism 50 . In the embodiment shown in FIG. 1 , the collar end 10 sends the first working signal to the anti-drag mechanism 50 . (Differences from Figure 1 are not shown in Figure 4)

The beneficial effects achieved by this embodiment are the same as those of the structure shown in FIG. 1 .

In another embodiment, as shown in FIG. 2 , a schematic structural diagram of another smart pet leash with an anti-drag mechanism is also provided. The difference between this embodiment and the previous embodiment is that the smart pet leash provided by this embodiment The rope also includes: a tension sensor 40 .

Wherein, the tension sensor 40 is arranged on the collar end 10, and is used to detect the tension on the collar end 10; Mechanism 50 sends a first working signal.

In this embodiment, when the trigger action of the control button 201 on the handle end 20 is detected and the handle end 20 determines that the tension measured by the tension sensor 40 is greater than the tension threshold, the handle end 20 sends a first One working signal, the anti-drag mechanism 50 extends its own length based on the first working signal, that is, controls the inner cylinder 54 to protrude from the outer cylinder 51 .

In another embodiment, as shown in FIG. 3 , a schematic structural diagram of another smart pet leash with an anti-drag mechanism is provided. The difference between this embodiment and the previous embodiment is that the handle end 20 can also be An emergency button 202 is provided. When a trigger action for the emergency button 202 is detected, the handle end 20 will judge whether the anti-drag mechanism 50 is working. 50 sends a second working signal to make the motor 53 work and drive the inner cylinder 54 to retract into the outer cylinder 51 . If the anti-drag mechanism 50 is not currently working, it is not necessary to send any signal to the anti-drag mechanism 50 to keep the anti-drag mechanism 50 in the non-working state.

As shown in Fig. 4, Fig. 5 and Fig. 6, it is a schematic structural view of the anti-drag mechanism of the embodiment of the present invention, and the anti-drag mechanism 50 includes:

The outer cylinder 51 has a guide rail 52 on its inner surface, and the guide rail 52 includes an ejection rail 521 and a recovery rail 522 along the axial direction, and two connecting rails along the radial direction, namely a first connecting rail 523 and a second connecting rail 524 . Wherein the first connecting track 523 is close to the first end 511 of the outer cylinder 51 , and the second connecting track 524 is close to the second end 512 of the outer cylinder 51 . The two ends of the ejection track 521 and the recovery track 522 are respectively connected by a first connecting track 523 and a second connecting track 524 , so that the four tracks form a return-shaped guide track 52 .

Wherein, both the ejection track 521 and the recovery track 522 are slopes with a certain inclination, such as 45°, which are wedge-shaped, and the ejection track 521 is located at a higher level than the recovery track 522 .

The motor 53 is arranged on the outer surface of the outer cylinder 51 and is a geared motor.

The inner cylinder 54 is sleeved inside the outer cylinder 51. When the inner cylinder 54 is located inside the outer cylinder 51, the inner surface close to the first end 511 of the outer cylinder 51 is called the third end 541 in this embodiment, and the The inner surface of the second end 512 of the outer cylinder 51 is called a fourth end 542 .

The slider 55 is arranged on the outer surface of the inner cylinder 54. The slider 55 can be nested and matched with the shape of the guide rail 52, so that it can move in the guide rail 52, and then drive the inner cylinder 54 to extend into the outer cylinder 51 or from the outer cylinder 51. stick out. In the initial state of the anti-drag mechanism 50 , the slider 55 is at an initial position in the guide rail 52 , which is a position of the recovery rail 522 close to the first end 511 .

The gear 56 and the rack 57 are arranged on the outer surface of the inner cylinder 54, wherein the gear 56 is connected with the motor 53, and the motor 53 is used to drive the gear 56 to rotate. In the initial state of the fall prevention mechanism 50 , the gear 56 and the rack 57 are engaged.

One end of the spring 58 is disposed on the inner surface of the first end 511 of the outer cylinder 51 , and the other end is disposed on the outer surface of the third end 541 of the inner cylinder 54 . When the slider 55 was at the initial position in the guide rail 52, the inner cylinder 54 was sleeved inside the outer cylinder 51, and the spring 58 was in a compressed state. When the slider 55 in the inner cylinder 54 was located in the second connecting track 524, the inner cylinder 54 Most of them stretch out from the outer cylinder 51, and the spring 58 is in a stretched state.

Taking the embodiment shown in Figure 3 as an example, the working principle of the anti-drag mechanism provided by the present invention is described as follows:

When the pet suddenly sprints and pulls the rope body 30 under some incentive, that is to say, when the smart pet rope is suddenly stretched by an external force, the tension sensor 40 tests the tension on the collar end 10 and transmits the tension to the collar end 30, when the user presses the control button 201 of the handle end 20, that is, when the handle end 20 detects the user's trigger action on the control button 201, it sends a first indication signal to the collar end 10, and the collar end 10 is based on the first indication The signal judges whether the pulling force is greater than the pulling force threshold, and when the pulling force is greater than the pulling force threshold, sends the first working signal to the motor 53 in the anti-drag mechanism 50, and the motor 53 drives the gear 56 to rotate based on the first working signal, and the gear 56 continues to rotate. Engage the rack 57, so that the inner cylinder 54 moves along the A direction in FIG. As shown, the slope of the recovery track 522 produces an oblique downward force on the slider 55, coupled with the elastic force of the spring 58 on the slider 55, thereby pushing the slider 55 to slide down to the first connecting track 523 and enter the ejection track 521. At the far left end, at this time, since the spring 58 is compressed to the maximum state, the spring 58 has an acting force on the inner cylinder 54 in the B direction, and at this time, the gear 56 and the rack 57 are separated, and the motor 53 no longer has an acting force on the inner cylinder 54 , thus the inner cylinder 54 moves in the B direction under the action of the elastic force of the spring 58 and the pulling force received by the rope body 30, and drives the slider 55 to move in the B direction in the pop-up track 521, and the inner cylinder 54 extends out of the outer cylinder 51, thereby achieving the extension The effect of a smart pet leash.

When the slider 55 travels to the rightmost end of the ejection track 521, that is, when the inner tube 54 stretches out to the maximum displacement, the action force of the inclined surface of the ejection track 521 that the slider 55 is subjected to will push the slider 55 upwards, and the spring 58 is at this moment. In the state of being stretched, the motor 53 has an active force to the left on the slider 55, so the direction of the resultant force is as shown in Figure 8. The active force generated by the inclined surface of the pop-up track 521 plus the elastic force of the spring 58 pushes the slider 55 into the second Connect the track 524, and when going to the top of the second connecting track 524, that is, when the rightmost end of the recovery track 522, the gear 56 is engaged with the rack 57.

In one embodiment, the recovery time can be set, for example, it is set to take the starting time as the starting point, and after setting the length of time, the motor 53 works again, and the slider 55 is pushed into the second connecting track 524 and the recovery track 522 until the slider When 55 arrived at the initial position, the motor 53 stopped working, and the inner cylinder 54 retracted into the outer cylinder 51.

In another embodiment, the retraction and retraction of the inner cylinder 54 can also be realized by setting a recovery button (not shown in the figure) on the handle end 20. In this state, if the user triggers the recovery button 202 on the handle end 20, The motor 53 works, the driving gear 56 and the rack 57 are further engaged, and the slider 55 is driven to move in the recovery track 522 to the direction A in FIG.

In one embodiment, the collar end 10 is provided with a control chip, such as an Arduino nano, for judging whether the pulling force is greater than the pulling force threshold and sending a signal to the anti-dripping mechanism 50 . The motor 53 can be driven by an L298N motor. The control chip can also be arranged on the handle end 20 .

In one embodiment, the control system of the smart pet leash provided by the present invention is implemented based on the following model:

Set the tension threshold as F0, when the tension value on the rope body 30 is 0-F0, the anti-drag mechanism 50 is locked and cannot be elongated; when the tension sensor 40 detects the tension value F>F0, the anti-drag mechanism 50 is unlocked, and the inner cylinder 54 protrudes from the outer cylinder 51 to achieve the effect of extending the rope body 30 .

Let the elongation of the inner cylinder 54 stretch out from the outer cylinder 51 be y, the friction force of the damper is proportional to the elongation velocity V (the speed at which the inner cylinder 54 stretches out from the outer cylinder 51), and the damping coefficient is f, The stiffness coefficient of the spring 58 is k, and the mass of the damper slider/ball is m.

According to Newton's second law, the following formula (1) is established:

The elongation y and the velocity As a state variable, the external force (that is, the pulling force detected by the pull sensor 40) and the resultant force F of the motor 53 applied by the pet to the rope body 30 is used as an input, and the length y that the inner cylinder 54 stretches out from the outer cylinder 51 is used as an output. Formulas (2)-(4) are established:

x ₁ =y (2)

According to the above motion equation, the state space expression is obtained as:

y=x (6)

The above is the mathematical model of the open-loop control system. If more precise control is to be achieved, closed-loop control needs to be realized through the state feedback control system, that is, the input of the system is adjusted by the difference between the elongation of the rope and the target elongation. Feedback control can be realized through the motor, and the block diagram of the control system is shown in Figure 9:

The coefficient matrices of the open-loop control system are formula (7) and formula (8):

Calculate the optimal feedback gain matrix P through the optimal control theory, take the performance index weight parameters f=1, q=1, r=1, and control the target length of the anti-drag mechanism 50 to elongate as y _d , then the performance index can be Expressed by formula (9):

The Riccati differential equation can be obtained:

Using MATLAB software to solve the Riccati differential equation, P(t) and g(t) can be obtained, then the optimal tracking closed-loop system equation is:

in, v(t)=F, R(t)=1.

y _d is included in g(t) and can be solved by the Riccati equation.

In an embodiment, the implementation code of the handle end 20 may be as follows:

Those of ordinary skill in the art should understand that: the discussion of any of the above embodiments is exemplary only, and is not intended to imply that the scope of the present disclosure (including claims) is limited to these examples; under the idea of the present invention, the above embodiments or Combinations between technical features in different embodiments are also possible, steps may be carried out in any order, and there are many other variations of the different aspects of the invention as described above, which are not presented in detail for the sake of brevity.

In addition, well-known power/ground connections to integrated circuit (IC) chips and other components may or may not be shown in the provided figures, for simplicity of illustration and discussion, and so as not to obscure the present invention. . Furthermore, devices may be shown in block diagram form in order to avoid obscuring the invention, and this also takes into account the fact that details regarding the implementation of these block diagram devices are highly dependent on the platform on which the invention is to be implemented (i.e. , these details should be well within the understanding of those skilled in the art). Where specific details (eg, circuits) have been set forth to describe example embodiments of the invention, it will be apparent to those skilled in the art that other embodiments may be implemented without or with variations from these specific details. Implement the present invention down. Accordingly, these descriptions should be regarded as illustrative rather than restrictive.

Although the invention has been described in conjunction with specific embodiments of the invention, many alternatives, modifications and variations of those embodiments will be apparent to those of ordinary skill in the art from the foregoing description. For example, other memory architectures such as dynamic RAM (DRAM) may use the discussed embodiments.

Embodiments of the present invention are intended to embrace all such alterations, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent replacements, improvements, etc. within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. An intelligent pet rope with an anti-drag mechanism, characterized in that it comprises: The handle end is provided with a control button, which is used to send a first indication signal to the collar end based on the detected trigger action for the control button; The collar end is used to send a first working signal to the anti-drag mechanism based on the first indication signal, and is also used to be put on the pet's neck; The anti-drag mechanism is arranged between the collar end and the rope body, and is used to extend its own length based on the first working signal, so that the length of the smart pet rope is extended; The rope body is connected to the handle end and the anti-drag mechanism. 2. The smart pet leash with an anti-drag mechanism according to claim 1, wherein the smart pet leash further comprises: a tension sensor, arranged at the collar end, for detecting the tension on the collar end; The collar end is further configured to send a first working signal to the anti-drag mechanism when the pulling force is greater than a pulling force threshold and the first indication signal is received. 3. The smart pet rope with an anti-drag mechanism according to claim 1, characterized in that, the handle end is also provided with: an emergency button; The handle end is further configured to send a second indication signal to the collar end when a trigger action for the emergency button is detected; The collar end is also used to judge whether the anti-drag mechanism is working based on the second indication signal, and if yes, send a second working signal to the anti-drag mechanism to make the anti-drag mechanism shrink return to the original length; otherwise, the first working signal is not sent to the anti-drag mechanism, so that the anti-drag mechanism does not work. 4. An intelligent pet leash with an anti-drag mechanism, characterized in that it comprises: The handle end is provided with a control button, which is used to send a first working signal to the anti-drag mechanism based on the detected trigger action for the control button; The collar end is used to put on the pet's neck; The anti-drag mechanism is arranged between the collar end and the rope body, and is used to extend its own length based on the first working signal, so that the length of the smart pet rope is extended; The rope body is connected to the handle end and the anti-drag mechanism. 5. The smart pet leash with an anti-drag mechanism according to claim 4, wherein the smart pet leash further comprises: a tension sensor, arranged at the collar end, for detecting the tension on the collar end; The handle end is further configured to send a first working signal to the anti-dripping mechanism when the pulling force is greater than a pulling force threshold and a trigger action on the control button is detected. 6. The smart pet leash with an anti-drag mechanism according to claim 4, wherein the handle end is further provided with: an emergency button; The handle end is also used to send a second working signal to the anti-drag mechanism if the anti-drag mechanism is working when the trigger action for the emergency button is detected, so that the anti-drag mechanism The inverted mechanism retracts to the original length; If the anti-drag mechanism is not working, the first working signal is not sent to the anti-drag mechanism, so that the anti-drag mechanism does not work. 7. The smart pet leash with an anti-drag mechanism according to claim 1 or 4, wherein the anti-drag mechanism comprises: The outer cylinder, the inner surface of the outer cylinder has an axial ejection track, a recovery track, and a radial first connecting track and a second connecting track connected between the ejection track and the recovery track Return-shaped guide rail, the recovery track is higher than the horizontal plane where the ejection track is located; The motor is arranged on the outer surface of the outer cylinder; an inner cylinder sleeved in the outer cylinder; a spring disposed between the inner surface of the first end of the outer cylinder and the outer surface of the third end of the inner cylinder, the spring is stretched when the inner cylinder protrudes from the outer cylinder, when the inner cylinder extends into the outer cylinder, the spring is compressed; The slider is arranged on the outer surface of the inner cylinder and can move in the return-shaped guide rail to drive the inner cylinder to expand and contract in the outer cylinder. The initial position of the slider in the return-shaped guide rail is at a position of the recovery track near the first end; A gear and a rack are arranged on the outer surface of the inner cylinder, and the gear is driven by the motor to drive the slider and the inner cylinder to move. When the slider is located in the first connecting track , the gear is separated from the rack, and when the slider is located in the second connecting track, the gear engages with the rack. 8. The smart pet leash with an anti-drag mechanism according to claim 7, wherein the motor is a geared motor. 9. The smart pet leash with an anti-drag mechanism according to claim 7, wherein the ejection track and the recovery track are wedge-shaped tracks with an inclination. 10. The smart pet leash with an anti-drag mechanism according to claim 2 or 5, wherein the pulling force threshold includes at least two levels.