Electric ratchet scissors

Abstract

The utility model belongs to the technical field of electric tools, and particularly relates to an electric ratchet shear which comprises a motor, a speed reducing mechanism and a mounting plate, a fixed blade is arranged at the end of a speed reducing shell, a movable blade is hinged to the upper end of the fixed blade, a first gear is arranged on a rotating shaft of the motor, and a second gear is arranged on an input shaft of a speed reducing assembly. A first wheel shaft and a second wheel shaft are arranged on the mounting plate, a third gear and a fourth gear are arranged on the first wheel shaft, a fifth gear and a sixth gear are arranged on the second wheel shaft, the first gear is in meshed connection with the third gear, the number of teeth of the third gear is larger than that of teeth of the first gear, and the fourth gear is in meshed connection with the fifth gear; the number of teeth of the fifth gear is larger than that of teeth of the fourth gear, the sixth gear is connected with the second gear in a meshed mode, the number of teeth of the second gear is larger than that of teeth of the sixth gear, the speed reduction assembly is three sets of planetary gears, and the fixed blade is provided with a limiting piece for axially limiting the movable blade. The utility model has the advantages of large torque and large load; and large shearing force can be borne.

Description

Technical field:

[0001] The utility model belongs to the technical field of electric tools, in particular to an electric ratchet shear. Background technology:

[0002] A Chinese utility model patent (publication number CN220092886U, application date 2023.06.30, publication date 2023.11.28) discloses a new type of electric ratchet cable cutter, comprising a cable cutter body, the cable cutter body being provided with a fixed blade for cutting cables, a drive device being provided on one side of the fixed blade, and a transmission shaft being provided within the drive device, the transmission shaft passing through a through hole in the fixed blade and connected to a bearing seat, the drive device being divided into a drive unit and a transmission unit, the drive unit being provided with a drive motor, and a motor housing being mounted on the outer wall of the drive motor for protecting the motor, the transmission unit being provided with a protective housing connected to the motor housing, the protective housing being provided within a transmission gear set, and the transmission gear set and the drive motor being connected via a step gear. Referring to the drawings in the specification, it can be seen that the transmission gear set comprises two sets of planetary gears.

[0003] The shortcomings of the above-mentioned electric ratchet cable cutter are: 1. The speed reduction is achieved through two sets of speed reduction structures formed by step wheels and two sets of planetary gears. The electric ratchet cable cutter has a relatively fast cutting speed, low torque and light load; 2. When subjected to large shearing forces, the fixed blade and the movable blade are easily separated, making it impossible to complete the cutting. Summary of the invention:

[0004] The utility model aims to provide an electric ratchet shear which has large torque and load and can withstand large shearing force.

[0005] The utility model is achieved in this way:

[0006] The transmission gear is connected with the transmission gear of the present invention one by one, and the transmission gear is connected with the transmission gear of the present invention on the one hand, and the transmission gear is connected with the transmission gear of the present invention on the other hand, and the transmission gear is connected with the transmission gear of the present invention on the other hand.

[0007] In the above electric ratchet shears, a seventh gear is provided on the output shaft of the reduction assembly, and meshing teeth engaged with the seventh gear are provided on the movable blade. The tooth profiles of the seventh gear and the meshing teeth are helical teeth.

[0008] In the above-mentioned electric ratchet shears, the three sets of planetary gears include a first planetary gear, a second planetary gear and a third planetary gear, the first planetary gear includes a first sun gear, a first planetary gear, a first ring gear and a first planetary carrier, the first sun gear is arranged on the input shaft, and the first ring gear is arranged on the reduction housing, the second planetary gear includes a second sun gear, a second planetary gear, a second ring gear and a second planetary carrier, the second sun gear is arranged on the first planetary carrier, and the second ring gear is arranged on the reduction housing, the third planetary gear includes a third sun gear, a third planetary gear, a third ring gear and a third planetary carrier, the third sun gear is arranged on the second planetary carrier, the third ring gear is arranged on the reduction housing, and the output shaft of the reduction assembly is provided on the third planetary carrier.

[0009] In the above-mentioned electric ratchet shears, the first gear ring, the second gear ring and the third gear ring have the same module and number of teeth, and are an integrated structure with the reduction housing.

[0010] In the above-mentioned electric ratchet shears, the number of the first planetary gears, the second planetary gears and the third planetary gears are the same, and the module and the number of teeth of the first sun gear are the same.

[0011] In the above-mentioned electric ratchet shears, the first planetary carrier, the second planetary carrier and the third planetary carrier are all circular mounting plates, and the axles of the first planetary gear, the second planetary gear and the third planetary gear are respectively fixedly mounted on the corresponding circular mounting plates, and the first planetary gear, the second planetary gear and the third planetary gear are respectively rotatably connected to their respective axles.

[0012] In the above electric ratchet shears, the output shaft is provided with an eighth gear, the third planetary carrier is provided with an inner ring gear matched with the eighth gear, and the third planetary carrier is meshed with the output shaft through the eighth gear and the inner ring gear.

[0013] In the above-mentioned electric ratchet shears, the limiting member includes an assembly plate, a limiting plate, and a connecting plate connecting the assembly plate and the limiting plate. The assembly plate is installed on the side of the fixed blade away from the movable blade, and the fixed blade and the movable blade are arranged between the assembly plate and the limiting plate.

[0014] In the above-mentioned electric ratchet shears, buffer teeth are respectively provided at both ends of the movable blade, and the buffer teeth include a tooth portion and a mounting portion. The tooth shape of the tooth portion is the same as the tooth shape of the meshing teeth of the movable blade, and the movable blade is provided with a mounting groove adapted to the mounting portion.

[0015] In the above-mentioned electric ratchet shears, the buffer teeth are made of wear-resistant non-metallic material.

[0016] In the above-mentioned electric ratchet shears, the wear-resistant non-metallic material is plastic or rubber, and the plastic is ABS plastic (a terpolymer of acrylonitrile, butadiene and styrene) or PVC (polyvinyl chloride). In the present embodiment, the wear-resistant non-metallic material is ABS plastic.

[0017] In the above-mentioned electric ratchet shears, a cover plate is provided on the side of the mounting plate away from the motor, one end of the first wheel axle is rotatably connected to the mounting plate through a bearing, and the other end is rotatably connected to the cover plate through a bearing, and one end of the second wheel axle is rotatably connected to the mounting plate through a bearing, and the other end is rotatably connected to the cover plate through a bearing.

[0018] The above-mentioned electric ratchet shears further includes a housing, which includes a handle for holding by hand and a cover body that covers the motor and the reduction mechanism.

[0019] The outstanding advantages of the utility model compared with the prior art are:

[0020] 1. The utility model performs three-set gear reduction by arranging a first wheel shaft, a second wheel shaft, and various gears arranged thereon on the mounting plate. Simultaneously, three sets of planetary gears are used for reduction of speed, resulting in a good reduction of speed. The electric ratchet shears have a relatively slow shearing speed, large torque, and heavy load. In addition, a limiting member is provided on the fixed blade to axially limit the movable blade. The fixed blade and the movable blade are not easily separated, thereby being able to withstand a large shearing force.

[0021] 2. The tooth profile of the seventh gear and the meshing teeth of the utility model is helical teeth, which can withstand both radial and axial forces, have strong load-bearing capacity and good shearing effect;

[0022] 3. Buffer teeth are provided at both ends of the movable blade of the utility model. The buffer teeth include a tooth portion and a mounting portion. The tooth shape of the tooth portion is the same as the tooth shape of the meshing teeth of the movable blade, which buffers the rotation of the movable blade and prevents teeth from hitting. Description of the drawings:

[0023] Figure 1 It is a three-dimensional diagram of the utility model;

[0024] Figure 2 It is a three-dimensional diagram of the utility model without the housing;

[0025] Figure 3 It is the transmission structure of the motor and the reduction mechanism of the utility model;

[0026] Figure 4 It is a stereoscopic diagram of the output shaft, the seventh gear and the eighth gear of the present invention.

[0027] Figure numerals: 1. Motor; 2. Reduction housing; 3. Fixed blade; 4. Movable blade; 5. Rotating shaft; 6. First gear; 7. Input shaft; 8. Second gear; 9. Mounting plate; 10. First axle; 11. Second axle; 12. Third gear; 13. Fourth gear; 14. Fifth gear; 15. Sixth gear; 16. Output shaft; 17. Seventh gear; 18. Meshing teeth; 19. Assembly plate; 20. Limiting plate; 21. Connecting plate; 22. Mounting groove; 23. Cover plate; 24. Housing; 25. Eighth gear. Specific implementation method:

[0028] The present invention is further described below with reference to specific embodiments. Figure 1 —4:

[0029] An electric ratchet shear comprises a motor 1 and a reduction mechanism, the reduction mechanism comprising a reduction housing 2 and a reduction assembly arranged in the reduction housing 2, one end of the reduction housing 2 is provided with a fixed blade 3, the upper end of the fixed blade 3 is hinged with a movable blade 4, a first gear 6 is provided on the rotating shaft 5 of the motor 1, a second gear 8 is provided on the input shaft 7 of the reduction assembly, and a mounting plate 9 is also included, the other end of the reduction housing 2 and the motor 1 are fixedly mounted on the mounting plate 9, the mounting plate 9 is provided with a first wheel shaft 10 and a second wheel shaft 11, the first wheel shaft 10 is provided with a third gear 12 and a fourth gear 13, the second wheel shaft 11 is provided with a fifth gear 14 and the sixth gear 15, the first gear 6 is meshed with the third gear 12, and the number of teeth of the third gear 12 is more than the number of teeth of the first gear 6, the fourth gear 13 is meshed with the fifth gear 14, and the number of teeth of the fifth gear 14 is more than the number of teeth of the fourth gear 13, the sixth gear 15 is meshed with the second gear 8, and the number of teeth of the second gear 8 is more than the number of teeth of the sixth gear 15, the reduction assembly is three sets of planetary gears, the fixed blade 3 is provided with a limit member for axially limiting the movable blade 4, the output shaft 16 of the reduction assembly is provided with a seventh gear 17, and the movable blade 4 is provided with meshing teeth 18 meshed with the seventh gear 17.

[0030] The working principle of this utility model is as follows: Figure 1-4 As shown, the rotating shaft 5 of the motor 1 rotates, driving the first gear 6 to rotate, and then driving the third gear 12, the first wheel shaft 10 and the fourth gear 13 to rotate, thereby driving the fifth gear 14, the second wheel shaft 11 and the sixth gear 15 to rotate, and further driving the second gear 8 and the input shaft 7 of the reduction assembly to rotate, and finally after being decelerated by the reduction assembly, it is output from the output shaft 16 of the reduction assembly, and drives the movable blade 4 to rotate through the seventh gear 17 and the meshing teeth 18.

[0031] The utility model performs three-set gear reduction by arranging a first wheel shaft 10, a second wheel shaft 11, and various gears arranged thereon on the mounting plate 9, and simultaneously reduces speed through three sets of planetary gears, so the reduction effect is good, the shearing speed of the electric ratchet shear is relatively slow, the torque is large, and the load is large; in addition, the utility model provides a limit member on the fixed blade 3 for axially limiting the movable blade, and the fixed blade 3 and the movable blade 4 are not easily separated, thereby being able to withstand a large shear force.

[0032] In order to achieve better load-bearing capacity and better shearing effect, the tooth profiles of the seventh gear 17 and the meshing teeth 18 are helical teeth, which can withstand both radial forces and axial forces.

[0033] The structure of the three sets of planetary gears: The three sets of planetary gears include a first planetary gear, a second planetary gear and a third planetary gear. The first planetary gear includes a first sun gear, a first planetary gear, a first ring gear and a first planetary carrier. The first sun gear is arranged on the input shaft 7, and the first ring gear is arranged on the reduction housing 2. The second planetary gear includes a second sun gear, a second planetary gear, a second ring gear and a second planetary carrier. The second sun gear is arranged on the first planetary carrier, and the second ring gear is arranged on the reduction housing 2. The third planetary gear includes a third sun gear, a third planetary gear, a third ring gear and a third planetary carrier. The third sun gear is arranged on the second planetary carrier, and the third ring gear is arranged on the reduction housing 2. The output shaft 16 of the reduction assembly is provided on the third planetary carrier.

[0034] Furthermore, the first ring gear, the second ring gear and the third ring gear have the same module and number of teeth, and are an integrated structure with the reduction housing 2 .

[0035] Furthermore, the number of the first planetary gears, the second planetary gears and the third planetary gears is the same, and the module and the number of teeth of the first sun gear are the same.

[0036] Furthermore, the first planetary carrier, the second planetary carrier and the third planetary carrier are all circular mounting plates, the axles of the first planetary gear, the second planetary gear and the third planetary gear are respectively fixedly mounted on the corresponding circular mounting plates, and the first planetary gear, the second planetary gear and the third planetary gear are respectively rotatably connected to their respective axles.

[0037] The transmission structure between the output shaft 16 and the third planetary carrier is as follows: Figure 1 、 2 As shown in FIG. 4 , the output shaft 16 is provided with an eighth gear 25 , and the third planetary carrier is provided with an inner ring gear matched with the eighth gear 25 . The third planetary carrier is meshed with the output shaft 16 through the eighth gear 25 and the inner ring gear.

[0038] In this embodiment, the gear module of each set of planetary gears is 5, wherein the number of teeth of the first planetary gear, the second planetary gear, and the third planetary gear is 13. The larger the gear module of the planetary gear, the stronger the load-bearing capacity of the gear.

[0039] The structure of the limiter: Figure 1 、 2 As shown, the limiting member includes an assembly plate 19, a limiting plate 20, and a connecting plate 21 connecting the assembly plate 19 and the limiting plate 20. The assembly plate 19 is installed on the side of the fixed blade 3 away from the movable blade 4, and the fixed blade 3 and the movable blade 4 are arranged between the assembly plate 19 and the limiting plate 20. The structure is simple, easy to install, and has a good limiting effect.

[0040] In order to buffer the rotation of the movable blade 4 and prevent teeth from hitting, buffer teeth are respectively provided at both ends of the movable blade 4. The buffer teeth include a tooth portion and a mounting portion. The tooth shape of the tooth portion is the same as the tooth shape of the meshing teeth 18 of the movable blade 4. The movable blade 4 is provided with a mounting groove 22 that matches the mounting portion to facilitate installation.

[0041] Preferably, the buffer teeth are made of wear-resistant non-metallic material, which is wear-resistant and not easily damaged.

[0042] Furthermore, the wear-resistant non-metallic material is plastic or rubber, and the plastic is ABS plastic (terpolymer of acrylonitrile, butadiene and styrene) or PVC (polyvinyl chloride). In the present embodiment, the wear-resistant non-metallic material is ABS plastic, which is convenient for processing.

[0043] Furthermore, a cover plate 23 is provided on the side of the mounting plate 9 away from the motor 1, one end of the first axle 10 is rotatably connected to the mounting plate 9 through a bearing, and the other end is rotatably connected to the cover plate 23 through a bearing, and one end of the second axle 11 is rotatably connected to the mounting plate 9 through a bearing, and the other end is rotatably connected to the cover plate 23 through a bearing.

[0044] In order to facilitate hand holding and protect the motor 1 and the reduction mechanism, a housing 24 is also included. The housing 24 includes a handle portion for hand holding and a cover body that covers the motor 1 and the reduction mechanism.

[0045] The above embodiment is only one of the preferred embodiments of the present invention and is not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes made based on the shape, structure, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. An electric ratchet shear, comprising a motor (1) and a reduction mechanism, wherein the reduction mechanism comprises a reduction housing (2) and a reduction assembly arranged in the reduction housing (2), wherein one end of the reduction housing (2) is provided with a fixed blade (3), and the upper end of the fixed blade (3) is hingedly connected to a movable blade (4), a first gear (6) is provided on a rotating shaft (5) of the motor (1), and a second gear (8) is provided on an input shaft (7) of the reduction assembly, characterized in that: The invention also includes a mounting plate (9), the other end of the reduction housing (2) and the motor (1) are fixedly mounted on the mounting plate (9), the mounting plate (9) is provided with a first wheel shaft (10) and a second wheel shaft (11), the first wheel shaft (10) is provided with a third gear (12) and a fourth gear (13), the second wheel shaft (11) is provided with a fifth gear (14) and a sixth gear (15), the first gear (6) is meshed with the third gear (12), and the number of teeth of the third gear (12) is greater than the number of teeth of the first gear (6), the fourth gear (13) is meshed with the fifth gear (14), and the number of teeth of the fifth gear (14) is greater than the number of teeth of the fourth gear (13), the sixth gear (15) is meshed with the second gear (8), and the number of teeth of the second gear (8) is greater than the number of teeth of the sixth gear (15), the reduction assembly is three sets of planetary gears, and the fixed blade (3) is provided with a limiting member for axially limiting the movable blade (4).

2. The electric ratchet shears according to claim 1, characterized in that: The output shaft (16) of the reduction assembly is provided with a seventh gear (17), and the movable blade (4) is provided with meshing teeth (18) meshed with the seventh gear (17). The tooth profiles of the seventh gear (17) and the meshing teeth (18) are helical teeth.

3. The electric ratchet shears according to claim 1, characterized in that: The three sets of planetary gears include a first planetary gear, a second planetary gear and a third planetary gear. The first planetary gear includes a first sun gear, a first planetary gear, a first ring gear and a first planetary carrier. The first sun gear is arranged on an input shaft (7), and the first ring gear is arranged on a reduction housing (2). The second planetary gear includes a second sun gear, a second planetary gear, a second ring gear and a second planetary carrier. The second sun gear is arranged on the first planetary carrier, and the second ring gear is arranged on the reduction housing (2). The third planetary gear includes a third sun gear, a third planetary gear, a third ring gear and a third planetary carrier. The third sun gear is arranged on the second planetary carrier, and the third ring gear is arranged on the reduction housing (2). The output shaft (16) of the reduction assembly is provided on the third planetary carrier.

4. The electric ratchet shears according to claim 1, characterized in that: The limiting member comprises an assembly plate (19), a limiting plate (20), and a connecting plate (21) connecting the assembly plate (19) and the limiting plate (20); the assembly plate (19) is mounted on a side of the fixed blade (3) away from the movable blade (4); and the fixed blade (3) and the movable blade (4) are arranged between the assembly plate (19) and the limiting plate (20).

5. The electric ratchet shears according to claim 1, characterized in that: Buffer teeth are respectively provided at both ends of the movable blade (4), the buffer teeth comprising a tooth portion and a mounting portion, the tooth shape of the tooth portion being the same as the tooth shape of the meshing teeth (18) of the movable blade (4), and a mounting groove (22) adapted to the mounting portion is provided on the movable blade (4).

6. The electric ratchet shears according to claim 5, characterized in that: The buffer teeth are made of wear-resistant non-metallic material.

7. The electric ratchet shears according to claim 1, characterized in that: A cover plate (23) is provided on the side of the mounting plate (9) away from the motor (1); one end of the first wheel shaft (10) is rotatably connected to the mounting plate (9) via a bearing, and the other end is rotatably connected to the cover plate (23) via a bearing; one end of the second wheel shaft (11) is rotatably connected to the mounting plate (9) via a bearing, and the other end is rotatably connected to the cover plate (23) via a bearing.

8. The electric ratchet shears according to claim 1, characterized in that: It also includes a housing (24), which includes a handle portion for holding by hand and a cover body that covers the motor (1) and the speed reduction mechanism.

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