A digging arm linkage structure on a children's toy car

Abstract

The invention discloses an arm-digging linkage structure on a children's toy car, comprising a car body, a large arm rotatably connected at the top position of the outer side of the car body, a small arm rotatably connected at one end of the large arm, a bucket rotatably connected at one end of the small arm, a replaceable electric drive gear box is installed on the inner end face of the large arm, a pendulum is fixedly connected to the power output end of the replaceable electric drive gear box, one end face of the pendulum is rotatably connected to a lifting rod, and the other end face of the pendulum is rotatably connected to a first pull rod, a turntable is installed at the corresponding position of the large arm and the small arm, and one end face of the turntable is rotatably connected to a second pull rod. The motor drive structure is adopted, which not only reduces a drive gear box and a control circuit, thus saving costs, but also allows the complex actions of digging, lifting, descending, dumping, etc., which were originally completed by controlling two circuits and cooperating with two motor-driven gear boxes, to be completed by controlling only one circuit of one motor-driven gear box.

Description

Technical Field

[0001] The invention relates to the technical field of toy car digging arm linkage, in particular to a digging arm linkage structure on a children's toy car. Background Art

[0002] The riding electric toy cars for children, electric engineering vehicles for children, electric excavators for children, electric shovels for children, electric forklifts for children, etc. sold on the market, especially the electric excavators for children, require the engineering vehicle's boom, forearm, bucket and their joints to rotate and cooperate with each other to complete the continuous action when completing the excavation, lifting, lowering, dumping and other actions. Generally, the bucket and the forearm are fixed together or the boom and the vehicle body share an electric drive gearbox, and the forearm and the bucket share an electric drive gearbox;

[0003] However, the existing technology bucket cannot rotate, and the big arm drives the small arm to rise and fall, the movement is stiff, and it cannot carry sand and soil. It is like chopping the ground with an axe, and the excavator cannot realize the digging action of the excavator. The playability is extremely low. Secondly, two electric drive gear boxes are required, and two sets of independently controllable circuits are required to respectively control the two electric drive gear boxes, which increases the cost. In addition, the two independently controlled circuits are used to control the movement of the digging arms to cooperate with each other, which is difficult for children to operate. In addition, for the manually driven digging arm, the child controls the vehicle body with one hand and controls the lifting of the big arm with the other hand. The small arm and the bucket cannot be controlled and can only be made into one. In order to avoid the above technical problems, it is indeed necessary to provide a digging arm linkage structure on a children's toy car to overcome the above defects in the prior art. Summary of the invention

[0004] The present invention provides an excavator arm linkage structure on a children's toy car, which can effectively solve the technical problems proposed in the above background technology, that the excavator bucket cannot rotate, the upper arm drives the lower arm to rise and fall, the movement is stiff, and the excavator cannot carry sand and soil, just like chopping the ground with an axe. The excavator cannot realize the excavation action of the excavator, and the playability is extremely low. Secondly, two electric drive gear boxes are required, and two sets of independently controllable circuits are required to respectively control the two electric drive gear boxes, which increases the cost. In addition, the two independently controlled circuits are used to control the movement of the excavator arms to cooperate with each other, which is difficult for children to operate. In addition, for the manually driven excavator arm, the child controls the vehicle body with one hand and controls the lifting of the upper arm with the other hand. The lower arm and the excavator bucket cannot be controlled and can only be made into one piece.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a digging arm linkage structure on a children's toy car, comprising a car body, a large arm is rotatably connected at the outer top position of the car body, one end of the large arm is rotatably connected to a small arm, one end of the small arm is rotatably connected to a bucket, a replaceable electric drive gear box is installed on the inner end surface of the large arm, a swing piece is fixedly connected to the power output end of the replaceable electric drive gear box, one end surface of the swing piece is rotatably connected to a lifting rod, and the other end surface of the swing piece is rotatably connected to a first pull rod, a turntable is installed at the corresponding position of the large arm and the small arm, and one end surface of the turntable is rotatably connected to a second pull rod;

[0006] The inner side edge of the turntable is slidably connected with a lever, a first limiting body is fixedly installed at a position corresponding to the turntable on one side end surface of the big arm, a second limiting body is fixedly connected at a position corresponding to the first limiting body on the outer side of the turntable, a driving body is installed at a position corresponding to the lever on the small arm, a transmission body is installed at a middle position on the inner side of the turntable, a rotating shaft is fixedly connected to one side end surface of the transmission body, and a pull rod hole is opened at a position corresponding to the first pull rod on the small arm;

[0007] The forearm is fixed to the boom through a rotatable shaft, the forearm is fixed to the boom through a rotatable shaft, and the boom is fixed to the vehicle body through a rotatable shaft; the driving end is located on the boom, and by driving two control ends, the movable joints between the boom and the vehicle body, and the movable joints between the forearm and the boom are controlled respectively; the turntable is located at the connection between the boom and the forearm, and the rotation of the forearm drives the turntable, and the turntable drives the bucket to rotate through the second pull rod, and one end of the second pull rod that drives the bucket to rotate is directly fixed to the boom, and through the change of the angle of the boom and the forearm, the two ends of the second pull rod are located at the boom and the bucket to produce a distance difference, so as to pull the bucket to rotate.

[0008] Preferably, the replaceable electric drive gearbox is replaced, and an armrest is installed at a position corresponding to the replaceable electric drive gearbox on the inner side of the boom, a spring is fixedly connected between the vehicle body and the boom, a manual lever is fixedly installed on the outer side of the boom, a damping body is fixedly installed on the inner side of the turntable located on the forearm, and a damping pin is fixedly connected to one end of the damping body;

[0009] After the manual lever is installed, when the digging arm is lowered to dig soil, the handrail on the arm is pressed to lower the arm, and the manual lever is pulled through the swing plate and the first pull rod to drive the forearm to rotate counterclockwise. When the forearm drops to a certain angle close to the ground, the limit body of the turntable and the limit body on the arm interact with each other, so that the turntable cannot rotate, thereby fixing the turntable end of the first pull rod, and the forearm continues to rotate and descend. Due to the distance difference, the end of the second pull rod pulls the bucket to rotate inward to dig sand and soil. When the digging arm is raised, the arm slowly rises under the action of the spring. , drives the manual rod through the swing piece and the first pull rod to drive the forearm to rotate clockwise; under the action of the damping member, the bucket maintains the excavation state and carries the sand up. When the forearm rotates upward, the second pull rod, under the action of the damping member and the weight of the sand, pushes the turntable to rotate forward, so that the limit body and the limit body are separated, and the forearm is lifted to a certain angle. The driving body on the forearm acts on the transmission body on the turntable through the lever, so that the turntable rotates in the opposite direction at high speed. When the second pull rod is driven, the bucket rotates in the opposite direction, and then the sand in the bucket is dumped.

[0010] Preferably, an arc-shaped sliding groove is provided on the inner side of the turntable at a position corresponding to the lever, and the lever is slidably connected to the turntable via the arc-shaped sliding groove.

[0011] Preferably, a pull rod rotating shaft is rotatably connected to the inner side of the pull rod hole, and the first pull rod is connected to the turntable via the pull rod rotating shaft.

[0012] Preferably, the other end of the lifting rod is connected to the vehicle body, a lifting shaft is rotatably embedded inside one end of the lifting rod, and the lifting rod is rotatably connected to the vehicle body via the lifting shaft.

[0013] Preferably, a turntable is installed at the corresponding position of the forearm and the bucket, one end of the second tie rod is connected to the turntable at the position of the boom, and the other end of the second tie rod is connected to the turntable at the position of the bucket.

[0014] Preferably, one end of the spring is connected to the vehicle body, and the other end of the spring is connected to the upper arm.

[0015] Preferably, a limiting groove is provided at the top of the upper arm and at a position corresponding to the armrest, and the armrest is slidably connected to the upper arm via the limiting groove.

[0016] Preferably, one end of the bucket is fixedly connected to a transmission plate, a rotating hole is opened at the inner middle position of the transmission plate at the bucket, and the bucket is rotatably connected to the rotating shaft at the forearm through the rotating hole.

[0017] Preferably, a rubber sleeve is sleeved on the outer side of the armrest, and the input end of the replaceable electric drive gear box is electrically connected to the output end of the external power supply.

[0018] Compared with the prior art, the present invention has the following beneficial effects: the present invention has a scientific and reasonable structure and is safe and convenient to use:

[0019] 1. The motor drive structure not only reduces one drive gearbox and control circuit, thus saving costs, but also allows the original two circuits to be controlled and the complex actions of digging, lifting, lowering, dumping, etc. to be completed by controlling only one circuit of a motor drive gearbox.

[0020] 2. The manual structure not only eliminates the drive gearbox and control circuit, thus saving costs, but also reduces the complex actions of digging, lifting, lowering and dumping that originally required multiple circuits to be controlled by the motor-driven gearbox. Now it can be completed by controlling only one manual lever and one handrail, which not only further reduces costs but also increases the fun of children's operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 It is a schematic diagram of the structure of the present invention;

[0023] Figure 2 It is a structural schematic diagram of the vehicle body of the present invention;

[0024] Figure 3 It is a schematic diagram of the installation structure of the rotating shaft of the present invention;

[0025] Figure 4 It is a schematic diagram of the installation structure of the tie rod hole of the present invention;

[0026] Figure 5 It is a schematic diagram of the installation structure of the handrail of the present invention;

[0027] Figure 6 It is a schematic diagram of the installation structure of the damping body of the present invention;

[0028] Numbers in the figure: 1. vehicle body; 2. upper arm; 3. lower arm; 4. bucket; 5. replaceable electric drive gearbox; 6. lifting rod; 7. swing plate; 8. first pull rod; 9. second pull rod; 10. turntable; 11. lever; 12. first limit body; 13. second limit body; 14. driving body; 15. transmission body; 16. rotating shaft; 17. pull rod hole; 18. spring; 19. manual lever; 20. handrail; 21. damping body; 22. damping ball. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0030] Example 1: Figure 1-4 As shown, the present invention provides a technical solution, a digging arm linkage structure on a children's toy car, comprising a body 1, a large arm 2 is rotatably connected at the top position of the outer side of the body 1, one end of the large arm 2 is rotatably connected to a small arm 3, one end of the small arm 3 is rotatably connected to a bucket 4, one end of the bucket 4 is fixedly connected to a transmission plate, a turntable 10 is installed at the corresponding position of the small arm 3 and the bucket 4, one end of the second pull rod 9 is connected to the turntable 10 at the position of the large arm 2, and the other end of the second pull rod 9 is connected to the turntable 10 at the position of the bucket 4, so as to facilitate sand excavation, a rotating hole is opened at the inner middle position of the transmission plate at the bucket 4, and the bucket 4 is connected to the small arm 3 through the rotating hole. The rotating shaft 16 at the arm 3 is rotatably connected to facilitate rapid sand excavation. A replaceable electric drive gearbox 5 is installed on the inner end face of the boom 2. A swing piece 7 is fixedly connected to the power output end of the replaceable electric drive gearbox 5. One end face of the swing piece 7 is rotatably connected to a lifting rod 6. The other end of the lifting rod 6 is connected to the vehicle body 1. A lifting shaft is rotatably embedded in the inner side of one end of the lifting rod 6. The lifting rod 6 is rotatably connected to the vehicle body 1 through the lifting shaft, which facilitates and quickly lifts the boom 2. The other end face of the swing piece 7 is rotatably connected to a first pull rod 8. A turntable 10 is installed at the corresponding position of the boom 2 and the forearm 3. A second pull rod 9 is rotatably connected to one end face of the turntable 10.

[0031] A lever 11 is slidably connected to the inner edge of the turntable 10, and an arc-shaped sliding groove is provided at the inner side of the turntable 10 at a position corresponding to the lever 11. The lever 11 is slidably connected to the turntable 10 through the arc-shaped sliding groove to improve the transmission reaction speed. A first limiting body 12 is fixedly installed at one end surface of the upper arm 2 at a position corresponding to the turntable 10, and a second limiting body 13 is fixedly connected at the outer side of the turntable 10 at a position corresponding to the first limiting body 12. A driving body 14 is installed at the position corresponding to the lever 11 of the small arm 3. A transmission body 15 is installed at the middle position of the inner side of the turntable 10, and a rotating shaft 16 is fixedly connected to one end surface of the transmission body 15. A pull rod hole 17 is provided at a position corresponding to the small arm 3 and the first pull rod 8, and a pull rod rotating shaft is rotatably connected to the inner side of the pull rod hole 17. The first pull rod 8 is connected to the turntable 10 through the pull rod rotating shaft, so that the force arm reacts quickly and the operation convenience can be improved.

[0032] It is fixed to the forearm 3 through a rotatable shaft, the forearm 3 is fixed to the boom 2 through a rotatable shaft, and the boom 2 is fixed to the vehicle body 1 through a rotatable shaft; the driving end is located on the boom 2, and by driving the two control ends, the movable joints between the boom 2 and the vehicle body 1, and the movable joints between the forearm 3 and the boom 2 are controlled respectively; the turntable 10 is located at the connection between the boom 2 and the forearm 3, and the forearm 3 rotates to drive the turntable 10, and the turntable 10 drives the bucket 4 to rotate through the second pull rod 9, and one end of the second pull rod 9 that drives the bucket 4 to rotate is directly fixed on the boom 2, and through the angle change of the boom 2 and the forearm 3, the two ends of the second pull rod 9 are located at the positions of the boom 2 and the bucket 4 to produce a distance difference, so as to pull the bucket 4 to rotate.

[0033] Example 2: Figure 5-6 As shown, the present invention provides a technical solution, a digging arm linkage structure on a children's toy car, the replaceable electric drive gearbox 5 is replaced, and an armrest 20 is installed at the corresponding position of the replaceable electric drive gearbox 5 on the inner side of the arm 2, and a limiting groove is provided at the top of the arm 2 and the corresponding position of the armrest 20. The armrest 20 is slidably connected to the arm 2 through the limiting groove, which is conducive to controlling the arm 2, and a rubber sleeve is sleeved on the outer side of the armrest 20 to increase the comfort of children's holding. A spring 18 is fixedly connected between the car body 1 and the arm 2, one end of the spring 18 is connected to the car body 1, and the other end of the spring 18 is connected to the arm 2, so as to facilitate the spring 18 to maintain the balance between the arm 2 and the car body 1, a manual rod 19 is fixedly installed on the outer side of the arm 2, a damping body 21 is fixedly installed on the inner side of the turntable 10 of the forearm 3, and a damping ball 22 is fixedly connected to one end of the damping body 21, and the input end of the replaceable electric drive gearbox 5 is electrically connected to the output end of the external power supply.

[0034] After installing the manual rod 19, when the digging arm descends to dig soil, the handrail 20 on the boom 2 is pressed to lower the boom 2, and the manual rod 19 is pulled through the swing plate 7 and the first pull rod 8 to drive the small arm 3 to rotate counterclockwise. When the small arm 3 descends to a certain angle close to the ground, the limit body of the turntable 10 and the limit body on the boom 2 interact with each other, so that the turntable 10 cannot rotate, thereby fixing the turntable 10 end of the first pull rod 8, and the small arm 3 continues to rotate and descend. Due to the distance difference, the end of the second pull rod 9 pulls the bucket 4 to rotate inward to dig sand and soil. When the digging arm is lifted, the boom 2 is slowly lifted under the action of the spring 18. The arm 3 is lifted up, and the manual rod 19 is driven to rotate clockwise through the swing piece 7 and the first pull rod 8. The bucket 4 maintains the excavation state under the action of the damping member, and carries the sand and soil up. When the arm 3 rotates upward, the second pull rod 9, under the action of the damping member and the weight of the sand and soil, pushes the turntable 10 to rotate in the forward direction, so that the limit body and the limit body are separated, and the arm 3 is lifted to a certain angle. The driving body 14 on the arm 3 acts on the transmission body 15 on the turntable 10 through the lever 11, so that the turntable 10 rotates in the opposite direction at high speed. When the second pull rod 9 is driven, the bucket 4 rotates in the opposite direction, and then the sand and soil in the bucket 4 are dumped.

[0035] The working principle and use process of the present invention are as follows: First, when using electric drive, the boom 2 is fixed to the vehicle body 1 through the rotating shaft 16 and can rotate 55 degrees around the rotating shaft 16. The arm 3 is fixed to the boom 2 through the rotating shaft 16 and can rotate 70 degrees around the rotating shaft 16. The bucket 4 is fixed to the arm 3 through the rotating shaft 16 and can rotate 120 degrees around the rotating shaft 16. The replaceable electric drive gear box 5 is fixed in the boom 2, the lifting rod 6 is connected to the vehicle body 1 through the swing plate 7, and the arm 3 is connected to the first pull rod 8. The turntable 10 is fixed at the connection between the boom 2 and the arm 3 and is connected to the rotating shaft of the boom 2 and the arm 3. 16 is concentric, connected to the bucket 4 through the first pull rod 8, the turntable 10 has a first limit body 12 and a second limit body 13 corresponding to each other, the transmission body 15 and the lever 11 corresponding to each other, the lever 11 is fixed on the rotating shaft 16 of the big arm 2, and can rotate around the rotating shaft 16, the big arm 2 has a second limit body 13 corresponding to the first limit body 12 on the turntable 10, and the small arm 3 has a driving body 14 corresponding to the lever 11. When the digging arm is lowered to dig soil, the electric drive gear box 5 can be replaced to rotate 115 degrees in the opposite direction, driving the lifting rod 6 to descend, while driving the small arm 3 to rotate counterclockwise through the swing piece 7 and the first pull rod 8. When the small arm 3 rotates Drive the bucket 4 and the second pull rod 9 to rotate, and pull the turntable 10 to rotate. When the arm 3 drops to 30 degrees close to the ground, the first limit body 12 and the second limit body 13 of the turntable 10 act on each other, so that the turntable 10 cannot rotate, and then fix the pull rod hole 17 of the turntable 10 end of the second pull rod 9, and the arm 3 continues to rotate and drop. Due to the distance difference, the bucket 4 end of the second pull rod 9 pulls the bucket 4 to rotate inward 120 degrees to excavate sand. When lifting the digging arm, the electric drive gear box 5 can be replaced to rotate forward 120 degrees. Through the swing piece 7 and the first pull rod 8, the lifting rod 6 is driven to lift the large arm 2 by 55 degrees. At the same time, the drive The movable arm 3 rotates clockwise. When the arm 3 is lifted to 60 degrees and the boom 2 is lifted, the bucket 4 maintains the excavation state under the action of the damping body 21 and carries the sand up. When the arm 3 rotates upward, the second pull rod 9 pushes the turntable 10 to rotate forward under the action of the damping body 21 and the weight of the sand, so that the first limit body 12 and the second limit body 13 are separated. When the arm 3 rotates to an angle of 65 degrees, the driving body 14 on the arm 3 acts on the transmission body 15 on the turntable 10 through the lever 11, so that the turntable 10 rotates in the opposite direction at a high speed. When the second pull rod 9 is driven, the bucket 4 rotates in the opposite direction by 90 degrees, thereby dumping the sand in the bucket 4.

[0036] Next, when using manual drive, the boom 2 is fixed to the vehicle body 1 through the rotating shaft 16 and can rotate around the rotating shaft 16, the arm 3 is fixed to the boom 2 through the rotating shaft 16 and can rotate around the rotating shaft 16 at a certain angle, the bucket 4 is fixed to the arm 3 through the rotating shaft 16 and can rotate around the rotating shaft 16 at a certain angle, the handrail 20 is located on the outer wall of the boom 2, the manual rod 19 and the spring 18 are fixed in the boom 2, the boom 2 is connected to the vehicle body 1 through the spring 18, and the manual rod 19 can rotate The arm 3 is connected to the rotating disk 10 by the first tie rod 8, the rotating disk 10 is fixed at the connection between the arm 2 and the arm 3, and is concentric with the rotating shaft 16 of the arm 2 and the arm 3. The bucket 4 is connected to the rotating disk 10 by the second tie rod 9. The rotating disk 10 has a first limiting body 12 and a second limiting body 13 corresponding to each other, and the transmission body 15 corresponds to the lever 11. The lever 11 is fixed on the rotating shaft 16 of the arm 2 and can rotate around the rotating shaft 16. The arm 2 has a second limiting body 13 corresponding to the first limiting body 12 on the rotating disk 10. 3 has a driving body 14 corresponding to the lever 11. When the digging arm is lifted, the arm 2 is slowly lifted under the action of the spring 18, driving the manual lever 19 through the swing piece 7 and the first pull rod 8 to drive the arm 3 to rotate clockwise. The arm 3 is lifted to a certain angle, and the driving body 14 on the arm 3 acts on the transmission body 15 on the turntable 10 through the lever 11 to make the turntable 10 rotate in the opposite direction at high speed. When the second pull rod 9 is driven, the bucket 4 rotates in the opposite direction, thereby dumping the sand in the bucket 4. When the digging arm is lowered to dig soil, the driving body 14 on the arm 3 acts on the transmission body 15 on the turntable 10 through the lever 11 to make the turntable 10 rotate in the opposite direction at high speed. Press the handrail 20 on the boom 2 to lower the boom 2, pull the manual rod 19 through the swing plate 7 and the first pull rod 8, drive the arm 3 to rotate counterclockwise, when the arm 3 drops to a certain angle close to the ground, the first limit body 12 of the turntable 10 and the second limit body 13 on the boom 2 interact with each other, so that the turntable 10 cannot rotate, thereby fixing the turntable 10 end of the second pull rod 9, and the arm 3 continues to rotate and descend. Due to the distance difference, the bucket 4 end of the second pull rod 9 pulls the bucket 4 to rotate inward to excavate sand.

[0037] Finally, it should be noted that the above description is only a preferred example of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A digging arm linkage structure on a children's toy car, comprising a car body (1), characterized in that: A boom (2) is rotatably connected to the top position of the outer side of the vehicle body (1), one end of the boom (2) is rotatably connected to a forearm (3), one end of the forearm (3) is rotatably connected to a bucket (4), a replaceable electric drive gearbox (5) is installed on the inner end face of the boom (2), a swing plate (7) is fixedly connected to the power output end of the replaceable electric drive gearbox (5), one end face of the swing plate (7) is rotatably connected to a lifting rod (6), and the other end face of the swing plate (7) is rotatably connected to a first pull rod (8), a turntable (10) is installed at the corresponding positions of the boom (2) and the forearm (3), and one end face of the turntable (10) is rotatably connected to a second pull rod (9); The inner side edge of the rotating disk (10) is slidably connected to a lever (11); a first limiting body (12) is fixedly installed at a position corresponding to the rotating disk (10) on one end surface of the upper arm (2); a second limiting body (13) is fixedly connected at a position corresponding to the first limiting body (12) on the outer side of the rotating disk (10); a driving body (14) is installed at a position corresponding to the lever (11) on the lower arm (3); a transmission body (15) is installed at a middle position on the inner side of the rotating disk (10); a rotating shaft (16) is fixedly connected to one end surface of the transmission body (15); and a pull rod hole (17) is provided at a position corresponding to the first pull rod (8) on the lower arm (3); The forearm (3) is fixed to the arm (3) via a rotatable shaft, the arm (3) is fixed to the arm (2) via a rotatable shaft, and the arm (2) is fixed to the vehicle body (1) via a rotatable shaft; the driving end is located on the arm (2), and by driving two control ends, the movable joint between the arm (2) and the vehicle body (1), and the movable joint between the forearm (3) and the arm (2) are respectively controlled; the turntable (10) is located at the connection between the arm (2) and the forearm (3), the forearm (3) rotates to drive the turntable (10), and the turntable (10) drives the bucket (4) to rotate via a second pull rod (9), one end of the second pull rod (9) driving the bucket (4) to rotate is directly fixed to the arm (2), and by the angle change of the arm (2) and the forearm (3), the two ends of the second pull rod (9) are located at the arm (2) and the bucket (4) to generate a distance difference, thereby pulling the bucket (4) to rotate.

2. The digging arm linkage structure on a children's toy car according to claim 1, characterized in that: The replaceable electric drive gearbox (5) is replaced, and a handrail (20) is installed at a position corresponding to the replaceable electric drive gearbox (5) on the inner side of the boom (2); a spring (18) is fixedly connected between the vehicle body (1) and the boom (2); a manual lever (19) is fixedly installed on the outer side of the boom (2); a damping body (21) is fixedly installed on the inner side of the turntable (10) located on the forearm (3); and a damping ball (22) is fixedly connected to one end of the damping body (21); After the manual rod (19) is installed, when the digging arm is lowered to dig soil, the handrail (20) on the upper arm (2) is pressed to lower the upper arm (2), and the manual rod (19) is pulled through the swing plate (7) and the first pull rod (8) to drive the small arm (3) to rotate counterclockwise. When the small arm (3) is lowered to a certain angle close to the ground, the limit body of the turntable (10) and the limit body on the upper arm (2) interact with each other, so that the turntable (10) cannot rotate, and then the turntable (10) end of the first pull rod (8) is fixed, and the small arm (3) continues to rotate and descend. Due to the distance difference, the end of the second pull rod (9) pulls the bucket (4) to rotate inward to dig sand. When the digging arm is raised, the upper arm (2) is slowly raised under the action of the spring, driving the manual rod (19). The rod (19) drives the small arm (3) to rotate clockwise through the swing plate (7) and the first pull rod (8); the bucket (4) maintains the excavation state under the action of the damping member and carries the sand upward. When the small arm (3) rotates upward, the second pull rod (9) pushes the turntable (10) to rotate forward under the action of the damping member and the weight of the sand, so that the first limit body (12) and the second limit body (13) are separated, and the small arm (3) is lifted to a certain angle. The driving body (14) on the small arm (3) acts on the transmission body 15 on the turntable (10) through the lever (11), so that the turntable (10) rotates in the opposite direction at a high speed. When the second pull rod (9) is driven, the bucket (4) rotates in the opposite direction, and then the sand in the bucket (4) is dumped.

3. The digging arm linkage structure on a children's toy car according to claim 1, characterized in that: An arc-shaped sliding groove is provided on the inner side of the rotating disk (10) at a position corresponding to the lever (11), and the lever (11) is slidably connected to the rotating disk (10) via the arc-shaped sliding groove.

4. The digging arm linkage structure on a children's toy car according to claim 1, characterized in that: The inner side of the pull rod hole (17) is rotatably connected with a pull rod rotating shaft, and the first pull rod (8) is connected to the rotating disk (10) via the pull rod rotating shaft.

5. The digging arm linkage structure on a children's toy car according to claim 2, characterized in that: The other end of the lifting rod (6) is connected to the vehicle body (1), and a lifting shaft is rotatably embedded inside one end of the lifting rod (6). The lifting rod (6) is rotatably connected to the vehicle body (1) via the lifting shaft.

6. The digging arm linkage structure on a children's toy car according to claim 5, characterized in that: A turntable (10) is installed at the corresponding positions of the forearm (3) and the bucket (4), one end of the second pull rod (9) is connected to the turntable (10) at the position of the upper arm (2), and the other end of the second pull rod (9) is connected to the turntable (10) at the position of the bucket (4).

7. The digging arm linkage structure on a children's toy car according to claim 5, characterized in that: One end of the spring (18) is connected to the vehicle body (1), and the other end of the spring (18) is connected to the upper arm (2).

8. The digging arm linkage structure on a children's toy car according to claim 5, characterized in that: A limiting groove is provided at the top of the upper arm (2) and at a position corresponding to the armrest (20), and the armrest (20) is slidably connected to the upper arm (2) via the limiting groove.

9. The digging arm linkage structure on a children's toy car according to claim 5, characterized in that: One end of the bucket (4) is fixedly connected to a transmission disc, a rotation hole is provided at the inner middle portion of the transmission disc of the bucket (4), and the bucket (4) is rotationally connected to a rotating shaft (16) at the forearm (3) through the rotation hole.

10. The digging arm linkage structure on a children's toy car according to claim 5, characterized in that: The outer side of the handrail (20) is sleeved with a rubber sleeve, and the input end of the replaceable electric drive gear box (5) is electrically connected to the output end of the external power supply.

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