Different-direction light cone flat gear box

Abstract

The invention discloses an incongruous light cone flat gear box, and relates to the technical field of extruder screw transmission gears, the incongruous light cone flat gear box comprises a first transmission box output shaft rotationally arranged in the gear box, the first transmission box output shaft is fixed with an output long shaft, and one end, far away from the first transmission box output shaft, of the output long shaft is connected with a screw; a second transmission box output shaft is also rotationally arranged in the gear box; a power transmission module used for synchronously driving the first transmission box output shaft and the second transmission box output shaft to rotate is further arranged in the gear box. One end, far away from the power transmission module, of the output shaft of the second transmission case is fixed with a first variable-thickness bevel gear shaft, the other end of the first variable-thickness bevel gear shaft is fixed with a second variable-thickness bevel gear shaft, and the first variable-thickness bevel gear shaft and the second variable-thickness bevel gear shaft form a group of herringbone tooth gear pairs; no gear is arranged on the output long shaft, so that the occupied space of the output center distance can be reduced, and the output torque is further increased.

Description

Technical Field

[0001] The invention relates to the technical field of extruder screw transmission gears, and in particular to a heterodyne light bevel flat gear box. Background Art

[0002] Existing extrusion equipment for extruding materials such as PP, PET, PVC, SPC, micro-foamed boards, or extrusion equipment for products such as pipes, profiles, plates, films, etc., are usually counter-rotating parallel twin-screw or counter-rotating conical twin-screw production lines.

[0003] For the counter-rotating parallel twin screws, please refer to the attached drawings in the specification. Figure 1 Its advantages are: the aspect ratio of the screw and barrel can be designed arbitrarily according to the characteristics of the raw materials, it has good stability, can output at high speed to achieve the output required by the customer, and has relatively loose requirements on the particle size of the raw materials; its disadvantages are: the screw has poor torsional resistance, and when processing highly filled or rigid raw materials, the limited torque output will limit production output.

[0004] For the counter-rotating conical twin screw, please refer to the attached figure in the specification. Figure 2 Its advantages are: the conical extruder has a large torque output and load-bearing capacity, is suitable for processing materials that require high shear force, has a large feeding area for the barrel and screw, and a large compression ratio; its disadvantages are: high requirements for return material, poor stability when there is less, low output, and high energy consumption; the large feed inlet of the extruder with a counter-rotating conical twin-screw design pushes toward the smaller extrusion end, which further aggravates the solid-phase coherent friction, resulting in particularly severe wear at the small hole end of the barrel and the small diameter section of the screw, resulting in a shortened life; high screw consumables; poor overall stability and short startup time; and strict requirements on material particle size. Summary of the invention

[0005] The purpose of the present invention is to provide a light bevel gearbox to solve the following technical problems: 1. The output torque needs to be improved and cannot meet the demand for increased production; 2. The service life of the screw needs to be improved, and the economic loss is large; 3. The output per unit time needs to be improved; 4. The plasticizing effect and surface quality of the products after production are not ideal.

[0006] The purpose of the present invention can be achieved through the following technical solutions: A light bevel gearbox with different rotation directions comprises a first transmission box output shaft rotatably arranged in the gearbox, wherein the first transmission box output shaft is fixed to an output long shaft, and an end of the output long shaft away from the first transmission box output shaft is connected to a screw rod; a second transmission box output shaft is also rotatably arranged in the gearbox; Wherein, the gearbox is also provided with a power transmission module for synchronously driving the first transmission box output shaft and the second transmission box output shaft to rotate; One end of the second transmission box output shaft away from the power transmission module is fixed to the first thickened bevel gear shaft, and the other end of the first thickened bevel gear shaft is fixed to the second thickened bevel gear shaft, and the first thickened bevel gear shaft and the second thickened bevel gear shaft form a group of herringbone gear pairs; Among them, a third thickened bevel gear shaft is rotatably arranged between the output shaft of the first transmission box and the output shaft of the second transmission box, and the end of the third thickened bevel gear shaft away from the power transmission module is fixedly connected to the fourth thickened bevel gear shaft, and the third thickened bevel gear shaft and the fourth thickened bevel gear shaft form another group of herringbone gear pairs, the first thickened bevel gear shaft is meshed with the third thickened bevel gear shaft, the second thickened bevel gear shaft is meshed with the fourth thickened bevel gear shaft, and an output stub shaft is fixedly arranged at one end of the fourth thickened bevel gear shaft away from the third thickened bevel gear shaft, and the other end of the output stub shaft is connected to the screw.

[0007] Preferably, the first thickened bevel gear shaft, the second thickened bevel gear shaft, the third thickened bevel gear shaft and the fourth thickened bevel gear shaft are bevel gear structures whose outer diameters increase or decrease linearly along the axial direction. When two sets of herringbone gear pairs are meshed for transmission, the axis centers of the third thickened bevel gear shaft, the fourth thickened bevel gear shaft and the output short shaft form an angle with the axis center of the output long shaft.

[0008] Preferably, the angle range is: 0°15′-0°45′.

[0009] Preferably, one side of the gear box is connected to the power box, and the power output module is arranged in the power box.

[0010] Preferably, the power output module includes an input shaft arranged in the power box, the input shaft is fixed to the output end of the servo motor fixedly arranged outside the power box through a coupling, a first gear is fixedly arranged on the input shaft, a transmission gear shaft is also rotatably arranged in the power box, a second gear meshing with the first gear is fixedly arranged on the transmission gear shaft, a third gear is also fixedly arranged on the transmission gear shaft, a distribution gear shaft is also rotatably arranged in the power box, a fourth gear meshing with the third gear is fixedly arranged on the distribution gear shaft, and a fifth gear is also fixedly arranged on the distribution gear shaft; Among them, a first distribution gear meshing with the fifth gear is fixedly arranged on the output shaft of the first transmission box, and a second distribution gear meshing with the fifth gear is fixedly arranged on the output shaft of the second transmission box.

[0011] Preferably, the first thickened bevel gear shaft is fixed to the second transmission box output shaft via a second internal spline sleeve, and the first thickened bevel gear shaft is fixed to the second thickened bevel gear shaft via a third internal spline sleeve; Among them, the third thickened bevel gear shaft is rotatably arranged in the gear box through a combined series bearing, and the third thickened bevel gear shaft and the fourth thickened bevel gear shaft are fixed by a fourth internal spline sleeve.

[0012] Preferably, the first thickened bevel gear shaft, the second thickened bevel gear shaft, the third thickened bevel gear shaft and the fourth thickened bevel gear shaft are rotatably arranged in the gear box via support bearings.

[0013] Preferably, the first transmission box output shaft is fixedly connected to the output long shaft through a first internal spline sleeve, and both ends of the output long shaft are rotationally connected to the gear box through a first long shaft centering bearing and a second long shaft centering bearing respectively.

[0014] Preferably, a self-aligning thrust bearing is further provided on the connecting end between the output shaft of the first transmission box and the output long shaft to withstand the pressure transmitted by the screw.

[0015] Preferably, an output spline sleeve is fixedly arranged at one end of the output long shaft away from the output shaft of the first transmission box, and an output spline sleeve (305) is fixedly arranged at one end of the output short shaft away from the third thickened bevel gear shaft; Wherein, the other end of the output spline sleeve is fixed with a screw.

[0016] Beneficial effects of the present invention: (1) The present invention does not limit the specific dimensions of the first thickened bevel gear and the second thickened bevel gear, and can be set accordingly based on the required angle between the output short shaft and the output long shaft. Therefore, by adjusting the thickened bevel gear, the angle of the output short shaft, that is, the angle of the screw, can be adjusted. The angle can be adjusted within any range. The smaller the angle, the larger the aspect ratio that can be set for the screw, and the higher the stability of the product. The smaller the cone angle of the thickened bevel gear, the smaller the retained shear force; the larger the angle, the smaller the aspect ratio that can be set for the screw, and the worse the stability of the product. The larger the cone angle of the thickened bevel gear, the greater the retained shear force. The present invention is based on the test that the aspect ratio of the extruder equipment is in the range of 28-32, and the product performance is good, the stability and the output are high. The corresponding angle range is: 0°15′-0°45′; (2) The output long shaft of the present invention is not provided with a gear, which can reduce the space occupied by the output center distance, so as to enlarge the diameter of the second thickened bevel gear on the second transition gear shaft, which is beneficial to further increase the output torque under the condition of fixed center distance. At the same time, the present invention can increase the output torque by providing a herringbone gear pair structure, and reduce the axial force on the support bearing by the mutual offset of the axial forces of the herringbone gears, thereby reducing the bearing load and the size of the support bearing; (3) For the light cone-flat counter-rotating twin screws in the present invention: its aspect ratio can be designed according to the idea of ​​counter-rotating parallel twin screws and the angle can be adjusted arbitrarily; the counter-rotating conical twin screws retain the shear force and thus have good stability and good adaptability to the particle size of the material; it has a large output torque, a large load-bearing capacity, and a good compression ratio; it combines the characteristics of the large back pressure of the ordinary counter-rotating conical twin screws and the small back pressure of the counter-rotating flat twin screws, which can reduce screw wear and increase service life; due to its good stability, it can run continuously for a long time; it has low energy consumption and high production capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] Figure 1 It is a schematic diagram of the structure of a counter-rotating parallel twin screw; Figure 2 It is a schematic diagram of the structure of a counter-rotating conical twin screw; Figure 3 It is a schematic diagram of the structure of a light cone flat twin screw; Figure 4 This is a schematic diagram of the structure of a heterogeneous light bevel flat gearbox of the present invention. Figure 1 ; Figure 5 This is a schematic diagram of the structure of a heterogeneous light bevel flat gearbox of the present invention. Figure 2 ; Figure 6 The present invention Fig. 9 Schematic diagram of the cross-section structure of AA; Figure 7 It is a structural schematic diagram of an output shaft in a heterodyne light bevel flat gearbox of the present invention; Figure 8 It is a schematic diagram of an axonometric cross-section structure of a heterogeneous light bevel flat gearbox of the present invention; Fig. 9 The diagram is a side structural diagram of a heterodyne light bevel flat gearbox of the present invention.

[0019] In the figure: 1, gear box; 2, input shaft; 3, first transmission box output shaft; 4, second transmission box output shaft; 5, tandem bearing; 101, power box; 102, servo motor; 201, first gear; 202, transmission gear shaft; 203, second gear; 204, third gear; 205, distribution gear shaft; 206, fourth gear; 207, fifth gear; 301, first distribution gear; 302, self-aligning thrust bearing; 303, first long Shaft centering bearing; 304, second long shaft centering bearing; 305, output spline sleeve; 306, output long shaft; 307, first internal spline sleeve; 401, second distribution gear; 402, second internal spline sleeve; 403, second thickened bevel gear shaft; 404, first thickened bevel gear shaft; 405, third internal spline sleeve; 406, fourth internal spline sleeve; 407, support bearing; 501, third thickened bevel gear shaft; 502, fourth thickened bevel gear shaft. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Example 1: Please refer to Figure 6-Figure 9 As shown, the present invention is a heterodyne light bevel gearbox, including a first transmission box output shaft 3 rotatably arranged in the gearbox 1, the first transmission box output shaft 3 is fixed to the output long shaft 306, and the output long shaft 306 is connected to the screw at one end away from the first transmission box output shaft 3; specifically, in this embodiment, when the first transmission box output shaft 3 is driven to rotate, the first transmission box output shaft 3 can drive one side of the extruder to rotate synchronously through the output long shaft 306.

[0022] In this embodiment, the first transmission box output shaft 3 is fixedly connected to the output long shaft 306 through the first internal spline sleeve 307 to realize torque transmission, and the two ends of the output long shaft 306 are rotatably connected to the gear box 1 through the first long shaft centering bearing 303 and the second long shaft centering bearing 304 respectively. The first long shaft centering bearing 303 and the second long shaft centering bearing 304 are used to realize the centering of the output long shaft 306, which can theoretically realize the transmission of pure torque. In addition, the long shaft centering bearing can prevent the output long shaft 306 from moving axially by limiting the inner ring of the bearing.

[0023] As a further solution of this embodiment, a self-aligning thrust bearing 302 is further provided on the connecting end between the first transmission box output shaft 3 and the output long shaft 306 to withstand the pressure transmitted by the screw.

[0024] A second transmission box output shaft 4 is also rotatably arranged in the gear box 1, and the second transmission box output shaft 4 is arranged parallel to the first transmission box output shaft 3; Among them, the gearbox 1 is also provided with a power transmission module for synchronously driving the first transmission box output shaft 3 and the second transmission box output shaft 4 to rotate. The torque transmitted by the first transmission box output shaft 3 and the second transmission box output shaft 4 is equal in magnitude and has the same rotation direction; specifically, the power is transmitted to the first transmission box output shaft 3 and the second transmission box output shaft 4 respectively through the power transmission module, so that the torque transmitted by the two output shafts is consistent in magnitude and rotation direction.

[0025] In this embodiment, one end of the second transmission box output shaft 4 away from the power transmission module is fixed to the first thickened bevel gear shaft 404, and the other end of the first thickened bevel gear shaft 404 is fixed to the second thickened bevel gear shaft 403, and the first thickened bevel gear shaft 404 and the second thickened bevel gear shaft 403 form a group of herringbone gear pairs; Among them, a third thickened bevel gear shaft 501 is rotatably arranged between the first transmission box output shaft 3 and the second transmission box output shaft 4, and the end of the third thickened bevel gear shaft 501 away from the power transmission module is fixedly connected to the fourth thickened bevel gear shaft 502, and the third thickened bevel gear shaft 501 and the fourth thickened bevel gear shaft 502 form another group of herringbone gear pairs, the first thickened bevel gear shaft 404 is meshed with the third thickened bevel gear shaft 501, the second thickened bevel gear shaft 403 is meshed with the fourth thickened bevel gear shaft 502, and the end of the fourth thickened bevel gear shaft 502 away from the third thickened bevel gear shaft 501 is an output short shaft, and the output short shaft is fixedly connected to the screw; Specifically, the first thickened bevel gear shaft 404, the second thickened bevel gear shaft 403, the third thickened bevel gear shaft 501 and the fourth thickened bevel gear shaft 502 of the present embodiment are bevel gear structures whose outer diameter increases or decreases linearly along the axial direction. When the two sets of herringbone gear pairs are meshed for transmission, the axis centers of the third thickened bevel gear shaft 501 and the fourth thickened bevel gear shaft 502 form an angle with the axis center of the output long shaft 306. The present embodiment does not specify the specific dimensions of the first thickened bevel gear shaft 404, the second thickened bevel gear shaft 403, the third thickened bevel gear shaft 501 and the fourth thickened bevel gear shaft 502. The limitation can be set accordingly based on the required angle between the output short shaft and the output long shaft 306. Therefore, the angle of the output short shaft, that is, the angle of the screw, can be adjusted by adjusting the thickened bevel gear shaft. The angle can be adjusted within any range. The smaller the angle, the larger the aspect ratio that can be set for the screw, and the higher the stability of the product. The smaller the cone angle of the thickened bevel gear, the smaller the retained shear force; the larger the angle, the smaller the aspect ratio that can be set for the screw, and the worse the stability of the product. The larger the cone angle of the thickened bevel gear, the greater the retained shear force. In this embodiment, based on the extrusion equipment with an aspect ratio in the range of 28-32, the product has better performance, stability and output, and the corresponding angle range is: 0°15′-0°45′; Therefore, in this embodiment, the torque of the second transmission box output shaft 4 is transmitted to the output short shaft through two sets of herringbone gear pairs, and the rotation direction is changed. The output short shaft can synchronously drive the screw to rotate, thereby forming a light cone flat twin screw structure (see Figure 3 ); See also Figure 6 and Figure 8 In this embodiment, the first thickened bevel gear shaft 404 is fixed to the second transmission box output shaft 4 by the second internal spline sleeve 402, and the first thickened bevel gear shaft 404 and the second thickened bevel gear shaft 403 are fixed by the third internal spline sleeve 405, wherein the third thickened bevel gear shaft 501 is rotatably arranged in the gear box 1 through the combined series bearing 5, and the third thickened bevel gear shaft 501 and the fourth thickened bevel gear shaft 502 are fixed by the fourth internal spline sleeve 406; it can be explained that by setting the combined series bearing 5, the pressure transmitted by the screw can be withstood, and the stability is higher, and the output short shaft is rotatably arranged in the gear box 1 through the bearing, which can rely on the steps of the inner and outer rings of the bearing to prevent axial movement.

[0026] In addition, the first thickened bevel gear shaft 404, the second thickened bevel gear shaft 403, the third thickened bevel gear shaft 501 and the fourth thickened bevel gear shaft 502 of this embodiment are rotatably arranged in the gear box 1 through the support bearing 407 to support each bevel gear shaft.

[0027] Furthermore, in this embodiment, no gears are arranged on the output long shaft 306, so that the space occupied by the output center distance can be reduced, so as to enlarge the diameters of the third thickened bevel gear shaft 501 and the fourth thickened bevel gear shaft 502, which is beneficial to further increase the output torque under the condition of fixed center distance. At the same time, in this embodiment, the output torque can be increased by arranging a herringbone gear pair structure, and the axial force of the herringbone gear can be offset by each other to reduce the axial force on the support bearing 407, thereby reducing the bearing load and reducing the size of the support bearing 407.

[0028] Therefore, for the light cone-flat counter-rotating twin screws in this embodiment: its aspect ratio can be designed according to the idea of ​​counter-rotating parallel twin screws and the angle can be adjusted arbitrarily; according to the counter-rotating conical twin screws, the shear force is retained so that the stability is good, and the adaptability to the material particle size is good; it has a large output torque, a large load-bearing capacity, and a good compression ratio; it combines the characteristics of large back pressure of ordinary counter-rotating conical twin screws and small back pressure of counter-rotating flat twin screws, which can reduce screw wear and increase service life; due to good stability, it can run continuously for a long time; low energy consumption and high production capacity.

[0029] Example 2: Based on Example 1, please refer to Figure 4-Figure 6 as well as Figure 7 , one side of the gear box 1 is connected to the power box 101, and the power output module is arranged in the power box 101; Wherein, the power output module includes an input shaft 2 arranged in the power box 101, and the input shaft 2 is fixed to the output end of the servo motor 102 fixedly arranged on the outside of the power box 101 through a coupling, and a first gear 201 is fixedly arranged on the input shaft 2, and a transmission gear shaft 202 is also rotatably arranged in the power box 101, and a second gear 203 meshing with the first gear 201 is fixedly arranged on the transmission gear shaft 202, and a third gear 204 is also fixedly arranged on the transmission gear shaft 202, and a distribution gear shaft 205 is also rotatably arranged in the power box 101, and a fourth gear 206 meshing with the third gear 204 is fixedly arranged on the distribution gear shaft 205, and a fifth gear 207 is also fixedly arranged on the distribution gear shaft 205, wherein a first distribution gear 301 meshing with the fifth gear 207 is fixedly arranged on the first transmission box output shaft 3, and a second distribution gear 401 meshing with the fifth gear 207 is fixedly arranged on the second transmission box output shaft 4; It can be explained that the servo motor 102 of this embodiment drives the input shaft 2 to rotate through the coupling, the input shaft 2 transmits power to the transmission gear shaft 202 through the first gear 201 and the second gear 203, the transmission gear shaft 202 transmits power to the distribution gear shaft 205 through the third gear 204 and the fourth gear 206, the distribution gear shaft 205 transmits power to the first transmission box output shaft 3 and the second transmission box output shaft 4 through the fifth gear 207 and the first distribution gear 301 and the second distribution gear 401, so that the torque of the two output shafts is consistent and the rotation direction is consistent.

[0030] In addition, in this embodiment, the output long shaft 306 is fixedly provided with an output spline sleeve 305 at one end away from the output shaft 3 of the first transmission box, and the output short shaft is fixedly provided with an output spline sleeve 305 at one end away from the third thickened bevel gear shaft 501, wherein the other end of the output spline sleeve 305 is fixed with a screw to synchronously transmit the torque to the screw.

[0031] A driving step of a heterodyne light bevel gearbox: See also Figure 6-Figure 8 , S1, the servo motor 102 drives the input shaft 2 to rotate through the coupling, and the input shaft 2 transmits power to the transmission gear shaft 202 through the first gear 201 and the second gear 203; S2, the transmission gear shaft 202 transmits power to the distribution gear shaft 205 through the third gear 204 and the fourth gear 206; S3, the distribution gear shaft 205 transmits power to the first transmission box output shaft 3 and the second transmission box output shaft 4 respectively through the fifth gear 207 and the first distribution gear 301 and the second distribution gear 401; S4, the first transmission box output shaft 3 drives the output long shaft 306 to rotate, the output long shaft 306 drives one side screw to rotate, the second transmission box output shaft 4 drives the first thickened bevel gear shaft 404 to rotate, and the first thickened bevel gear shaft 404 synchronously drives the second thickened bevel gear shaft 403; S5, the first thickened bevel gear shaft 404 and the second thickened bevel gear shaft 403 drive the third thickened bevel gear shaft 501 and the fourth thickened bevel gear shaft 502 to rotate respectively; S6. The third thickened bevel gear shaft 501 and the fourth thickened bevel gear shaft 502 drive the screw on the other side to rotate.

[0032] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, and a specific direction structure and operation, and therefore, cannot be understood as a limitation of the present invention. In addition, "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A light bevel gearbox with different directions, characterized in that: The gearbox comprises a first transmission box output shaft (3) rotatably arranged in the gearbox (1), wherein the first transmission box output shaft (3) is fixed to an output long shaft (306), and an end of the output long shaft (306) away from the first transmission box output shaft (3) is connected to a screw rod; a second transmission box output shaft (4) is also rotatably arranged in the gearbox (1); The gearbox (1) is also provided with a power transmission module for synchronously driving the first transmission box output shaft (3) and the second transmission box output shaft (4) to rotate; One end of the second transmission box output shaft (4) away from the power transmission module is fixed to the first thickened bevel gear shaft (404), and the other end of the first thickened bevel gear shaft (404) is fixed to the second thickened bevel gear shaft (403), and the first thickened bevel gear shaft (404) and the second thickened bevel gear shaft (403) form a herringbone gear pair; A third thickened bevel gear shaft (501) is rotatably arranged between the first transmission box output shaft (3) and the second transmission box output shaft (4); one end of the third thickened bevel gear shaft (501) away from the power transmission module is fixedly connected to the fourth thickened bevel gear shaft (502); the third thickened bevel gear shaft (501) and the fourth thickened bevel gear shaft (502) form another group of herringbone gear pairs; the first thickened bevel gear shaft (404) is meshed with the third thickened bevel gear shaft (501); the second thickened bevel gear shaft (403) is meshed with the fourth thickened bevel gear shaft (502); one end of the fourth thickened bevel gear shaft (502) away from the third thickened bevel gear shaft (501) is arranged as an output stub shaft; the other end of the output stub shaft is fixedly connected to the screw.

2. The light bevel gearbox according to claim 1, characterized in that: The first thickened bevel gear shaft (404), the second thickened bevel gear shaft (403), the third thickened bevel gear shaft (501) and the fourth thickened bevel gear shaft (502) are bevel gear structures whose outer diameters increase or decrease linearly along the axial direction; when the two sets of herringbone gear pairs are meshed for transmission, the axis centers of the third thickened bevel gear shaft (501), the fourth thickened bevel gear shaft (502) and the output short shaft form an angle with the axis center of the output long shaft (306).

3. The light bevel gearbox according to claim 2, characterized in that: The angle range is: 0°15′-0°45′.

4. The light bevel gearbox according to claim 1, characterized in that: One side of the gear box (1) is connected to the power box (101), and the power output module is arranged in the power box (101).

5. The light bevel gearbox according to claim 1, characterized in that: The power output module comprises an input shaft (2) arranged in a power box (101), the input shaft (2) being fixed to an output end of a servo motor (102) fixedly arranged outside the power box (101) via a coupling, a first gear (201) being fixedly arranged on the input shaft (2), a transmission gear shaft (202) being rotatably arranged in the power box (101), a second gear (203) meshing with the first gear (201) being fixedly arranged on the transmission gear shaft (202), a third gear (204) being fixedly arranged on the transmission gear shaft (202), a distribution gear shaft (205) being rotatably arranged in the power box (101), a fourth gear (206) meshing with the third gear (204) being fixedly arranged on the distribution gear shaft (205), and a fifth gear (207) being fixedly arranged on the distribution gear shaft (205); Wherein, a first distribution gear (301) meshing with the fifth gear (207) is fixedly arranged on the first transmission box output shaft (3), and a second distribution gear (401) meshing with the fifth gear (207) is fixedly arranged on the second transmission box output shaft (4).

6. The light bevel gearbox according to claim 1, characterized in that: The first variable-thickness bevel gear shaft (404) and the second transmission box output shaft (4) are fixed via a second internal spline sleeve (402), and the first variable-thickness bevel gear shaft (404) and the second variable-thickness bevel gear shaft (403) are fixed via a third internal spline sleeve (405); The third variable-thickness bevel gear shaft (501) is rotatably arranged in the gear box (1) via a combined series bearing (5), and the third variable-thickness bevel gear shaft (501) and the fourth variable-thickness bevel gear shaft (502) are fixed via a fourth internal spline sleeve (406).

7. The light bevel gearbox according to claim 6, characterized in that: The first thickened bevel gear shaft (404), the second thickened bevel gear shaft (403), the third thickened bevel gear shaft (501) and the fourth thickened bevel gear shaft (502) are rotatably arranged in the gear box (1) via a support bearing (407).

8. The light bevel gearbox according to claim 1, characterized in that: The first transmission box output shaft (3) is fixedly connected to the output long shaft (306) via a first internal spline sleeve (307), and both ends of the output long shaft (306) are rotationally connected to the gear box (1) via a first long shaft centering bearing (303) and a second long shaft centering bearing (304), respectively.

9. The light bevel gearbox according to claim 8, characterized in that: A self-aligning thrust bearing (302) is also provided on the connection end between the first transmission box output shaft (3) and the output long shaft (306) to withstand the pressure transmitted by the screw.

10. The light bevel gearbox according to claim 1, characterized in that: An output spline sleeve (305) is fixedly arranged at one end of the output long shaft (306) away from the first transmission box output shaft (3), and an output spline sleeve (305) is fixedly arranged at one end of the output short shaft away from the third thickened bevel gear shaft (501); The other end of the output spline sleeve (305) is fixed with a screw rod.

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