CN217246764U - Automatic lifting toy crane - Google Patents

Abstract

The utility model relates to the technical field of children toys, in particular to an automatic lifting toy crane with a light-up effect, which comprises a control box, a suspension arm, a winding mechanism, a trigger switch and a lamp group, wherein a control circuit board, a motor and a speed regulating mechanism are arranged in the control box; the distance between the top end of the suspension arm and the bottom of the control box is greater than the height of the control box; the winding mechanism comprises a winding wheel accommodated in the inner cavity of the control box, a traction rope wound on the winding wheel and a fixed pulley arranged at the top end of the suspension arm, and the winding wheel is connected with the output end of the speed regulating mechanism and driven by the speed regulating mechanism to rotate; the traction rope penetrates through the control box and is wound on the fixed pulley, and a counterweight is arranged at the tail end of the traction rope; the trigger switch is arranged at the top end of the suspension arm and is electrically connected with the control circuit board; the lamp bank comprises a first LED lamp arranged on the suspension arm and a second LED lamp fixed at the tail end of the traction rope, and the second LED lamp is electrically connected with the control circuit board through a power supply line arranged on the traction rope.

Description

Automatic lifting toy crane

Technical Field

The utility model relates to a children's toys technical field especially relates to an automatic rising toy loop wheel machine with bright lamp effect.

Background

The toy crane is a child toy simulating the appearance design of the crane, the unfolding or winding of a lifting rope on a suspension arm is adjusted in a manner of rotating a rocker or a winding wheel, so that the purpose of controlling the lifting of a hoisted object is achieved, a way for children to master the working principle of a pulley is provided, and the interest of the children in physical knowledge is stimulated.

Chinese utility model patent (CN 208406098U) discloses a crane for children's toys, which drives the rotating shaft to rotate through the rotating handle, and then makes the hauling rope set up in the rotating shaft coil or expand one by one, and fixes the balancing weight at the end of the hauling rope with the lift. The crane toy has simple structure and single function, is difficult to realize the automatic lifting of the balancing weight, and has insufficient interest; in addition, this toy loop wheel machine can not use in the relatively poor dark surrounds of light, has restricted its suitable scene, is unfavorable for improving the market competition of product.

SUMMERY OF THE UTILITY MODEL

Therefore, an automatic lifting toy crane with a lighting effect is needed to solve the technical problems of single function and insufficient interestingness of the toy crane.

An automatic lift toy crane comprising:

the control box is internally provided with a control circuit board, a motor electrically connected with the control circuit board and a speed regulating mechanism in driving connection with the output end of the motor;

the bottom end of the suspension arm is connected with the top of the control box, and the distance between the top end of the suspension arm and the bottom of the control box is greater than the height of the control box;

the winding mechanism comprises a winding wheel accommodated in the inner cavity of the control box, a traction rope wound on the winding wheel and a fixed pulley arranged at the top end of the suspension arm, and the winding wheel is connected with the output end of the speed regulating mechanism and driven by the speed regulating mechanism to rotate; the traction rope penetrates through the top of the control box and extends along the length direction of the suspension arm, the traction rope is wound on the fixed pulley, and a counterweight is arranged at the tail end of the traction rope;

the trigger switch is installed at the top end of the suspension arm and is electrically connected with the control circuit board; and

the lamp bank, the lamp bank is including installing on the davit and the first LED lamp of being connected with control circuit board electricity and fixing at the terminal second LED lamp of haulage rope, is equipped with the power supply line of electricity connection control circuit board and second LED lamp on the haulage rope.

In one embodiment, a first positioning column and a second positioning column are arranged on the traction rope at intervals, and the first positioning column and the second positioning column are driven by the traction rope to sequentially approach or depart from the trigger switch; when the first positioning column is contacted with the trigger switch, the control circuit board receives an electric signal sent by the trigger switch and controls the motor to rotate forwards; when the second positioning column is contacted with the trigger switch, the control circuit board receives an electric signal sent by the trigger switch and controls the motor to rotate reversely.

In one embodiment, the speed regulating mechanism is a gear set connected with the motor and the winding wheel respectively.

In one embodiment, the automatic lifting toy crane further comprises a power supply device accommodated in the inner cavity of the control box, the control circuit board is installed on a side plane of the winding wheel, a circular copper foil electrically connected with the power supply line and the first LED lamp respectively is arranged on the control circuit board, a probe is fixedly arranged on the inner wall of the control box below the winding wheel, the probe is electrically connected with the power supply device, the tail end of the probe abuts against the circular copper foil, and when the winding wheel rotates, the circular copper foil rotates relative to the probe and generates current.

In one embodiment, the automatic lifting toy crane further comprises a rocking wheel fixedly mounted on the winding wheel and rotating coaxially with the winding wheel, a rocker is eccentrically arranged on the rocking wheel, the rocker penetrates through the side wall of the control box, and the tail end of the rocker is located outside the control box.

In one embodiment, a bottom plate is fixedly arranged at the bottom of the control box, a doll model is mounted on the bottom plate, and the doll model comprises a leg part fixed on the bottom plate, a body part connected with the top end of the leg part and capable of swinging relative to the leg part in a vertical plane, a head part fixed at the top end of the body part, and a hand part fixedly connected with a rocker and rotatably connected with the body part.

In one embodiment, the suspension arm is fixedly or rotatably connected with the top end of the control box.

In one embodiment, a guide groove or two guide enclosing plates arranged in parallel are arranged on one surface of the suspension arm, which is back to the bottom plate, along the length direction of the suspension arm, and the traction rope is embedded between the guide groove or the two guide enclosing plates.

In one embodiment, the automatic lifting toy crane further comprises a horn accommodated in the inner cavity of the control box and electrically connected with the control circuit board.

In one embodiment, the power supply wire is attached to the outer surface of the traction rope; or the interior of the traction rope is hollow and forms a threading channel, and the power supply line is arranged in the threading channel in a penetrating way and is connected with the inner wall of the traction rope.

The automatic lifting toy crane of the utility model can automatically control the lifting of the counterweight by the motor by arranging the control circuit board and the motor, thereby improving the interest of the toy crane; through installing first LED lamp and second LED lamp on davit and haulage rope, the toy loop wheel machine is in the use, and first LED lamp and second LED lamp are lighted, when providing the bright light effect of toy loop wheel machine, can be convenient for the user look clear toy loop wheel machine and play in the relatively poor dark surrounds of light, has enlarged the suitable scene of toy loop wheel machine, is favorable to promoting the market competition of product.

Drawings

FIG. 1 is a schematic view of an embodiment of an automatic lift toy crane of the present invention;

FIG. 2 is an exploded view of a first portion of an automatic lift toy crane according to one embodiment of the present invention;

FIG. 3 is an exploded view of a second portion of an automatic lift toy crane according to one embodiment of the present invention;

fig. 4 is a schematic circuit diagram of a main control circuit according to an embodiment of the present invention;

fig. 5 is a schematic circuit diagram of an audio circuit according to an embodiment of the present invention;

fig. 6 is a schematic circuit diagram of a driving circuit according to an embodiment of the present invention.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be embodied in many other forms different from those described herein and similar modifications may be made by those skilled in the art without departing from the spirit and scope of the invention and, therefore, the invention is not to be limited to the specific embodiments disclosed below.

Please refer to fig. 1, fig. 2 and fig. 3, the present invention discloses an automatic lifting toy crane 10 with a lighting effect, which comprises a control box 100, a suspension arm 200, a winding mechanism, a trigger switch 400 and a light group 500, in this embodiment, a first part of the set toy crane comprises the control box 100 and the winding mechanism, and a second part of the set toy crane comprises the suspension arm 200 and the trigger switch 400, the light group 500 and the partial fittings of the winding mechanism installed on the suspension arm 200, so as to describe the overall structure of the toy crane. Specifically, the method comprises the following steps:

the control box 100 is provided with a control circuit board 110, a motor 120 electrically connected to the control circuit board 110, and a speed regulating mechanism 130 drivingly connected to an output end of the motor 120, wherein the speed regulating mechanism 130 is used for adjusting a transmission ratio of the motor 120 when outputting to the outside, so as to convert a high-speed rotation of the motor 120 into a low-speed transmission. The automatic lift toy crane 10 further includes a power supply unit housed within the interior of the control box 100, the power supply unit being connected to the control circuit board 110 for providing electrical power for operation of the toy crane. The bottom end of the boom 200 is connected to the top of the control box 100, and the distance between the top end of the boom 200 and the bottom of the control box 100 is larger than the height of the control box 100, that is, the height of the end of the boom 200 far away from the control box 100 is larger than the height of the end of the boom 200 connected to the control box 100, and the boom 200 is tilted so as to reserve a space for the lifting and lowering movement between the top end of the boom 200 and the placing plane. The winding mechanism comprises a winding wheel 310 accommodated in the inner cavity of the control box 100, a traction rope 320 wound on the winding wheel 310 and a fixed pulley 330 arranged at the top end of the suspension arm 200, the winding wheel 310 is connected with the output end of the speed regulating mechanism 130 and driven by the speed regulating mechanism 130 to rotate, the traction rope 320 penetrates through the top of the control box 100 and extends along the length direction of the suspension arm 200, the traction rope 320 is wound on the fixed pulley 330, and a counterweight 340 is arranged at the tail end of the traction rope 320. The trigger switch 400 is installed at the top end of the boom 200 and electrically connected to the control circuit board 110, and is used for triggering the sensing signal when being touched, sending the sensing signal to the control circuit board 110, and controlling the motor 120 to turn by the control circuit board 110, so as to achieve the purpose of controlling the counterweight 340 to ascend or descend. In this embodiment, the motor 120 is a servo motor. The lamp set 500 includes a first LED lamp 510 mounted on the boom 200 and electrically connected to the control circuit board 110, and a second LED lamp 520 fixed at the end of the pulling rope 320, wherein the pulling rope 320 is provided with a power supply line 350 electrically connecting the control circuit board 110 and the second LED lamp 520.

When the toy crane of this embodiment is in use, the control circuit board 110 is powered on and controls the motor 120 to rotate, the rotor of the motor 120 rotates and drives the speed adjusting mechanism 130 to work, so that the output end of the speed adjusting mechanism 130 outputs a lower rotation speed to drive the winding wheel 310 to rotate. The winding reel 310 winds or unwinds the traction rope 320 having one end fixed to the side of the loop thereof during rotation, so that the length of the free end of the traction rope 320 is gradually decreased or increased, thereby raising or lowering the level of the counterweight 340. When the trigger switch 400 is triggered during the lifting process of the counterweight 340, the trigger switch 400 sends an electrical signal to the control circuit board 110, and the control circuit board 110 controls the motor 120 to rotate in the reverse direction according to the electrical signal, so that the counterweight 340 is lifted and lowered back and forth in the lifting activity space. In addition, in the process of the lifting of the counterweight 340, the control circuit board 110 controls the first LED lamp 510 on the suspension arm 200 and the second LED lamp 520 at the tail end of the traction rope 320 to be turned on, so as to provide a light-on effect, and facilitate a user to clearly see the toy crane for playing in a dark environment with poor light, thereby enlarging the applicable scene of the toy crane.

In this embodiment, the box of control box 100 is the triangular prism structure of 90 degrees upsets, in other words, the vertical cross-section of control box 100 is triangle-shaped, through designing control box 100 for triangular prism structure, has utilized triangle-shaped stability principle, has improved the stability that control box 100 set up. Further, a bottom plate 140 is fixedly arranged at the bottom of the control box 100, and the bottom plate 140 is used for increasing the contact area between the control box 100 and the placing plane, so that the stability of the toy crane during placing is improved, and the toy crane is prevented from being damaged during toppling over. The automatic lifting toy crane 10 further comprises a rocking wheel 610 fixedly installed on the winding wheel 310 and coaxially rotating with the winding wheel 310, a rocker 620 is eccentrically arranged on the rocking wheel 610, the rocker 620 penetrates through the side wall of the control box 100, and the tail end of the rocker 620 is located outside the control box 100. Preferably, a groove 150 communicated with the inner cavity of the control box 100 is formed on the outer side wall of the control box 100, and the rocking wheel 610 is embedded in the groove 150 and rotates synchronously with the winding wheel 310 through a rotating shaft. Thus, when the power of the toy crane is turned off or the control circuit board 110 is damaged, the user can manually control the toy crane by rotating the rocker 620 to rotate the winding wheel 310.

Further, a doll model 630 is mounted on the bottom plate 140, and the doll model 630 includes a leg 631 fixed on the bottom plate 140, a body 632 connected to a top end of the leg 631 and capable of swinging in a vertical plane with respect to the leg 631, a head 633 fixed on a top end of the body 632, and a hand 634 fixedly connected to the rocker 620 and rotatably connected to the body 632. Preferably, the bottom plate 140 is provided with an insertion hole 141, and the leg portion 631 of the doll model 630 is inserted into the insertion hole 141 to realize the limit fixing of the doll model 630 on the bottom plate 140. In the process that the winding wheel 310 drives the rocking wheel 610 and the rocking bar 620 to rotate, the rocking bar 620 drives the hand portion 634 to rotate relative to the body portion 632, and at the same time, the body portion 632 will swing relative to the leg portion 631 under the impact of the hand portion 634, so as to simulate the situation that the doll model 630 rocks the rocking bar 620 to lift the counterweight 340.

The counterweight 340 may be a counterweight, or may be a toy or a model for providing a counterweight. In this embodiment, the weight 340 includes a hook fixed at the end of the pulling rope 320 and a basket installed on the hook, and a doll is disposed in the basket. Further, the outer surface of the doll is provided with a lamp housing for covering the second LED lamp 520. Preferably, a pentagram-shaped lamp housing is hung in the hand of the doll, and the power supply line 350 is fixed on the hook and the hanging basket and penetrates through the lamp housing to be connected with the second LED lamp 520; the power supply wire 350 can also be partially received inside the doll and penetrate the lamp housing to connect with the second LED lamp 520. In actual production, the shape of the doll model 630, the weight 340 and the outer shape of the doll on the bottom plate 140 can be modeled according to design requirements, for example, the weight 340 is designed as a swing, the doll and the doll model 630 are designed into shapes such as angel, and other shapes can be designed, which are not described herein again.

In one embodiment, the speed adjusting mechanism 130 is a gear set connected to the motor 120 and the winding wheel 310, respectively. Specifically, a cover is disposed on an outer surface of a mating body formed by the motor 120 and the speed adjusting mechanism 130, so that the motor 120, the speed adjusting mechanism 130 and the cover together form a gear box of the toy crane of this embodiment to provide power for rotating the winding wheel 310. In this embodiment, the speed adjusting mechanism 130 includes a first gear rotating coaxially with the output end of the motor 120, a second gear engaged with the first gear, and a third gear engaged with the second gear, the third gear rotates coaxially with the winding wheel 310 and transmits kinetic energy to the winding wheel 310, and the number of teeth of each gear increases step by step to realize deceleration of the output shaft of the motor 120. In actual production, the number of the meshed gears can be increased or decreased as required to satisfy the transmission ratio between the motor 120 and the winding wheel 310, which is not described herein again.

The boom 200 is used to support the crown block 330 and the traction rope 320 to suspend the counterweight 340. In one embodiment, the suspension arm 200 comprises a lower arm section 210, a middle arm section 220 and an upper arm section 230 which are connected in sequence, and the lower arm section 210, the middle arm section 220 and the upper arm section 230 are detachably connected, so that when any arm section is damaged, the damaged arm section can be independently replaced, and the use cost of the toy crane is reduced. In one embodiment, the boom arm 200 is fixedly or rotatably connected to the top end of the control box 100, and specifically, the lower arm section 210 is fixedly or rotatably connected to the top end of the control box 100. When the lower arm section 210 is rotatably connected to the top end of the control box 100, a limit stop is provided at the top end of the control box 100 at the side of the lower arm section 210. Preferably, the limit stops are disposed on the control box 100 on the side of the counterweight 340. Thus, during adjustment of the tilt angle of the boom 200, when the lower boom 200 abuts against the limit stops, the lower boom 200 does not rotate any further under the constraint of the limit stops, thereby defining the maximum tilt angle of the boom 200.

It should be further noted that, in an embodiment, a guide groove 240 or two guide enclosing plates arranged in parallel are provided on a side of the boom 200 facing away from the base plate 140 along a length direction of the boom 200, and the pulling rope 320 is embedded in the guide groove 240 or between the two guide enclosing plates. It will also be appreciated that guide slots 240 or guide enclosures are provided on the side of the boom 200 facing away from the counterweight 340. The position of the pulling rope 320 is limited by the arrangement of the guide groove 240 or the guide enclosing plate, so that the pulling rope 320 can be prevented from falling off from the suspension arm 200, and the problem of failure of the lifting action of the toy crane on the counterweight 340 can be further prevented. Furthermore, a limiting hole may be further disposed between the guide slot 240 or the two guide enclosing plates, and the traction rope 320 penetrates through the limiting hole and is respectively engaged with the winding wheel 310 and the fixed pulley 330, so as to further improve the stability of the traction rope 320 mounted on the boom 200.

The trigger switch 400 may be either an inductive switch or a toggle switch. When the trigger switch 400 is an inductive switch, the inductive switch may be a pressure-sensitive switch. In order to trigger the inductive switch or the toggle switch, in this embodiment, the pulling rope 320 is provided with a first positioning post 321 and a second positioning post 322 at an interval, and the first positioning post 321 and the second positioning post 322 are driven by the pulling rope 320 to sequentially approach or leave the trigger switch 400; when the first positioning post 321 contacts the trigger switch 400, the trigger switch 400 is pressed or toggled, so that a state change is generated to trigger an electrical signal, and the control circuit board 110 receives the electrical signal sent by the trigger switch 400 and controls the motor 120 to rotate forward; when the second positioning column 322 contacts the trigger switch 400, the trigger switch 400 is pressed or toggled, so that a state change is generated to trigger an electrical signal, and the control circuit board 110 receives the electrical signal sent by the trigger switch 400 and controls the motor 120 to rotate reversely. Thus, the first positioning post 321 and the second positioning post 322 periodically contact the trigger switch 400 to generate an electrical signal to control the forward and reverse rotation of the motor 120, so as to achieve the purpose of circularly lifting the counterweight 340 in the lifting space, thereby improving the interest of the toy crane.

It should be noted that, in the toy crane of this embodiment, the first LED lamp 510 includes a plurality of LED lamp beads arranged at intervals along the length direction of the suspension arm 200, and each LED lamp bead is connected by a wire laid in the suspension arm 200, so that when the toy crane works, the whole suspension arm 200 is lighted. The first LED lamp 510 and the second LED lamp 520 of the present embodiment may be directly electrically connected to the control circuit board 110, and start and stop are controlled by a switch button disposed on an outer surface of the control box 100, or may be turned on along with the lifting of the counterweight 340 during the rotation of the winding wheel 310. When the first LED lamp 510 and the second LED lamp 520 are lifted and lowered to be lighted along with the counterweight 340, the control circuit board 110 is mounted on a side plane of the winding wheel 310, a circular copper foil (not shown) electrically connected to the power supply line 350 and the first LED lamp 510, respectively, is disposed on the control circuit board 110, a probe 160 is fixedly disposed on the inner wall of the control box 100 below the winding wheel 310, the probe 160 is electrically connected to the power supply device, and the tip of the probe 160 abuts against the circular copper foil, so that when the winding wheel 310 rotates, the circular copper foil rotates relative to the probe 160 and generates current. It can also be understood that the circular copper foil on the control circuit board 110 and the probe 160 together form an electric brush, so that during the rotation of the winding wheel 310, the circular copper foil rotates fast relative to the probe 160, and the charged probe 160 slides on the circular copper foil while generating current, so as to connect the first LED lamp 510 and the second LED lamp 520 with the power supply respectively, thereby realizing the synchronous lighting of the first LED lamp 510 and the second LED lamp 520 along with the lifting of the counterweight 340.

In this embodiment, the power supply line 350 is attached to the outer surface of the pulling rope 320; or the pulling rope 320 is hollow and forms a threading channel, and the power supply wire 350 is threaded through the threading channel and connected with the inner wall of the pulling rope 320. When the power supply line 350 is attached to the outer surface of the pulling rope 320, the outer surface of the power supply line 350 can be bonded to the outer surface of the pulling rope 320, and the power supply line 350 and the pulling rope 320 can be twisted together in a spiral winding mode through clamping and buckling. When the hauling cable 320 is a hollow tubular structure, the power supply line 350 can be directly arranged in the inner cavity of the hauling cable 320 in a penetrating mode, so that the electric leakage accident possibly caused by the exposed arrangement of the power supply line 350 can be avoided, and the use safety of the toy crane is improved.

In one embodiment, the automatic lifting toy crane 10 further includes a speaker 700 housed in the inner cavity of the control box 100 and electrically connected to the control circuit board 110, for receiving the electrical signal sent by the control circuit board 110 and playing an audio signal with predetermined content to prompt the user. The toy crane of the embodiment comprises a main control circuit and a driving circuit, and particularly, can be combined with fig. 4 to 6, wherein the main control circuit comprises a main control IC chip (corresponding to U3 in fig. 4) arranged on a control circuit board, and a first LED lamp (i.e., D1) and a second LED lamp (i.e., D2) respectively connected with a VDD pin of U3; the audio circuit includes an audio IC (i.e., U2 in fig. 5) and a speaker connected to the SPN and SPP pins of the audio IC, and audio information to be played by the speaker is pre-stored in the audio IC. The audio IC is connected to the X1 pin of U3, so that when the main control IC chip sends an electrical signal to the speaker, a high level is generated at the VDD pin of the audio IC, and the audio IC responds to the electrical signal to control the speaker to play audio content. The driving circuit comprises a driving IC (namely U1 in figure 6) for controlling the forward and reverse rotation of the motor, and a motor driver connected with a VDD pin of the driving IC, wherein the motor driver is electrically connected with the motor, so that when the driving IC receives a motor forward rotation signal sent by the trigger switch, the level at a PB0 pin of the driving IC is increased, and the driving IC sends an electric signal to the motor driver, so that the motor driver controls the forward rotation of the motor. On the contrary, when the drive IC receives the motor reverse rotation signal sent by the trigger switch, the level at the PB1 pin of the drive IC rises, and the drive IC sends an electric signal to the motor driver, so that the motor driver controls the motor to reverse.

By arranging the control circuit board 110 and the motor 120, the automatic lifting toy crane 10 of the utility model can automatically control the lifting of the counterweight 340 by the motor 120, thereby improving the interest of the toy crane; through installing first LED lamp 510 and second LED lamp 520 on davit 200 and haulage rope 320, the toy loop wheel machine is in the use, and first LED lamp 510 and second LED lamp 520 are lighted, when providing the bright light effect of toy loop wheel machine, can be convenient for the user see clearly play the utensil loop wheel machine and play games in the relatively poor dark surrounds of light, has enlarged the suitable scene of toy loop wheel machine, is favorable to promoting the market competition of product.

All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made, which all fall within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. An automatic lifting toy crane, comprising:

the control box is internally provided with a control circuit board, a motor electrically connected with the control circuit board and a speed regulating mechanism in driving connection with the output end of the motor;

the bottom end of the suspension arm is connected with the top of the control box, and the distance between the top end of the suspension arm and the bottom of the control box is greater than the height of the control box;

the winding mechanism comprises a winding wheel accommodated in the inner cavity of the control box, a traction rope wound on the winding wheel and a fixed pulley arranged at the top end of the suspension arm, and the winding wheel is connected with the output end of the speed regulating mechanism and driven by the speed regulating mechanism to rotate; the traction rope penetrates through the top of the control box and extends along the length direction of the suspension arm, the traction rope is wound on the fixed pulley, and a counterweight is arranged at the tail end of the traction rope;

the trigger switch is installed at the top end of the suspension arm and is electrically connected with the control circuit board; and

the lamp bank, the lamp bank is including installing on the davit and the first LED lamp of being connected with control circuit board electricity and fixing at the terminal second LED lamp of haulage rope, is equipped with the power supply line of electricity connection control circuit board and second LED lamp on the haulage rope.

2. The automatic lifting toy crane according to claim 1, wherein the traction rope is provided with a first positioning column and a second positioning column at intervals, and the first positioning column and the second positioning column are driven by the traction rope to sequentially approach or depart from the trigger switch; when the first positioning column is contacted with the trigger switch, the control circuit board receives an electric signal sent by the trigger switch and controls the motor to rotate forwards; when the second positioning column is contacted with the trigger switch, the control circuit board receives an electric signal sent by the trigger switch and controls the motor to rotate reversely.

3. The automatic lifting toy crane of claim 2 wherein the speed adjustment mechanism is a gear train coupled to the motor and the take-up reel, respectively.

4. The automatic lifting toy crane according to claim 3, further comprising a power supply device received in the inner cavity of the control box, wherein the control circuit board is mounted on the side plane of the winding wheel, the control circuit board is provided with a circular copper foil electrically connected to the power supply line and the first LED lamp, respectively, the inner wall of the control box is fixedly provided with a probe below the winding wheel, the probe is electrically connected to the power supply device, the end of the probe abuts against the circular copper foil, and when the winding wheel rotates, the circular copper foil rotates relative to the probe and generates current.

5. The automatic lifting toy crane of claim 4, further comprising a rocking wheel fixedly mounted on the winding wheel and rotating coaxially with the winding wheel, wherein the rocking wheel is eccentrically provided with a rocker, the rocker penetrates through a side wall of the control box, and the end of the rocker is located outside the control box.

6. The automatic lifting toy crane of claim 5, wherein a bottom plate is fixedly arranged at the bottom of the control box, a doll model is mounted on the bottom plate, and the doll model comprises a leg fixed on the bottom plate, a body connected with the top end of the leg and capable of swinging relative to the leg in a vertical plane, a head fixed at the top end of the body, and a hand fixedly connected with the rocker and rotatably connected with the body.

7. The automated lifting toy crane of claim 6, wherein the boom arm is fixedly or rotatably connected to a top end of the control box.

8. The automatic lifting toy crane of claim 7, wherein the side of the boom facing away from the base plate is provided with a guide slot or two guide enclosing plates arranged in parallel along the length direction of the boom, and the traction rope is embedded in the guide slot or between the two guide enclosing plates.

9. The automatic lifting toy crane of claim 8, further comprising a horn received in the interior cavity of the control box and electrically connected to the control circuit board.

10. The automatic lifting toy crane of claim 9, wherein the power supply wires are disposed in close proximity to an outer surface of the pull cords; or the interior of the traction rope is hollow and forms a threading channel, and the power supply line is arranged in the threading channel in a penetrating way and is connected with the inner wall of the traction rope.

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