Novel internal tooth transmission co-rotating twin-screw speed reducer

Abstract

The utility model relates to the technical field of co-rotating twin-screw extrusion machinery, and discloses a novel internal tooth transmission co-rotating twin-screw speed reducer. The device mainly comprises an upper machine body for supporting, a lower machine body, two shunting gears, a gear shaft, an input gear shaft, internal and external gears, a short output gear shaft, a long output shaft, a serial bearing, a thrust bearing, a bearing seat and a belleville spring. An input gear shaft arranged in the upper machine body and the lower machine body directly transmits half power to a long output shaft through a shunting gear II, and meanwhile the other half power is transmitted to a short output gear shaft through a shunting gear I, a spline shaft, a gear shaft I, an inner gear, an outer gear and a gear shaft II. According to the speed reducer of the novel structure, the function that power is shunted through outer teeth and then shunted and converged through inner teeth is achieved. The transmission principle is novel, the machine body structure is simple, phase adjustment of the two output shafts is simple and reliable, torsion angle and compression error compensation is simple, industrial popularization can be achieved, manufacturing cost is low, and maintenance is easy.

Description

Technical Field

[0001] The utility model relates to the technical field of co-rotating twin-screw extruder machinery, in particular to a novel internal gear transmission co-rotating twin-screw reducer. Background Art

[0002] At present, the co-rotating twin-screw main reducers used in rubber, plastic, membrane equipment and petrochemical granulators on the market have a structure designed with external teeth for flow separation and then converging. Some test machines use a structure designed with internal teeth to directly drive two output shafts. The above reducers have the following unreasonable features, as follows:

[0003] 1) The reducer body with external gear structure needs to be divided into 4-5 layers of upper and lower structures. The design structure is complex and difficult to manufacture. In addition, the structural rigidity of each layer of the body after the box is poor. The body is easily deformed during processing and transportation, and it is difficult to ensure the runout error requirements of the two output shafts in the same direction.

[0004] 2) The reducer with external tooth structure adopts external tooth diversion and then uses another pair of external tooth confluence structure, which results in a long axial length of the box and makes it difficult to ensure the coaxiality error of each shaft hole.

[0005] 3) The external gear structure uses a large number of bearings in the internal design of the entire reducer, and the transmission structure is complex.

[0006] 4) The long axial length of the housing and the large number of bearings result in high manufacturing costs.

[0007] 5) The phase adjustment of the splines connecting the two output shafts requires adjustment of the two pairs of splitter gears respectively, which makes the phase adjustment complicated.

[0008] 6) The reducer with internal gear structure used in the test machine cannot meet the requirements of industrial application and promotion due to its structural design defects. In addition, the phase of the spline connecting the two output shafts cannot be adjusted by assembly and can only be guaranteed by processing. The phase accuracy is very low and cannot meet the use requirements. Utility Model Content

[0009] The purpose of the utility model is to provide a simple and reliable new type of co-rotating twin-screw reducer with internal gear transmission structure in view of the above-mentioned problems of the main reducer for the existing co-rotating twin-screw extruder. The main reducer has a novel transmission principle, a simple body structure, simple and reliable phase adjustment, can be industrialized and promoted, has low manufacturing cost and is easy to maintain. It is mainly used in co-rotating twin-screw extruder machinery and equipment such as rubber plastics, film equipment and petrochemical granulators.

[0010] The technical scheme of the utility model is as follows: a novel internal gear transmission co-directional twin-screw reducer, comprising an upper body 1, a lower body 2, two diverter gears, a gear shaft, an input gear shaft 3, internal and external gears 9, a short output gear shaft 13, a long output shaft 14, a tandem bearing 17, a thrust bearing 20, a bearing seat I 11, a bearing seat II 12 and a disc spring 21;

[0011] The upper body 1 and the lower body 2 are combined together to form a reducer housing, the diverter gear is located on the input side of the reducer housing, and the gear shaft is located on the output side of the reducer housing;

[0012] The splitter gear includes a splitter gear Ⅰ6 and a splitter gear Ⅱ19; the gear shaft includes a gear shaft Ⅰ8 and a gear shaft Ⅱ23; the input gear shaft 3 is meshed with the splitter gear Ⅰ6 and the splitter gear Ⅱ19 at the same time to realize the split transmission of the input power;

[0013] The splitter gear Ⅰ6 is installed on the distribution shaft Ⅰ5; the two ends of the spline shaft 7 are respectively installed in the distribution shaft Ⅰ5 and the gear shaft Ⅰ8 through splines; the output end of the spline shaft 7 transmits power to the gear shaft Ⅰ8 through the end splines;

[0014] The gear shaft I8 meshes with the outer teeth of the inner and outer gears 9 to transmit power to the inner teeth of the inner and outer gears 9, and the inner and outer gears 9 are installed in the reducer housing through bearings I10; multiple gear shafts II23 are arranged in the inner and outer gears 9, and the inner teeth of the inner and outer gears 9 simultaneously drive multiple identical gear shafts II23, and multiple gear shafts II23 mesh with the short output gear shaft 13 at the same time, driving the short output gear shaft 13 to rotate, thereby transmitting the required power; both ends of the gear shaft II23 are installed in the reducer housing and the bearing seat I11 through bearings IV22, and the bearing seat I11 is installed in the reducer housing;

[0015] The two ends of the short output gear shaft 13 are supported and fixed in the reducer housing and the bearing seat Ⅱ12 through bearings Ⅱ15, and the bearing seat Ⅱ12 is connected to the reducer housing; one end of the tandem bearing 17 is installed at the end of the short output gear shaft 13, and the other end is installed in the reducer housing to bear the axial thrust from the extruder screw;

[0016] The diverter gear II19 is installed on the distribution shaft II18; one end of the long output shaft 14 is connected to one side of the distribution shaft II18, and the other end passes through the inside of the internal and external gears 9 and is fixed in the reducer housing through the bearing III16 to achieve the power output requirement of the long output shaft 14; the thrust bearing 20 is installed on the other side of the distribution shaft II18, one end of which contacts the diverter gear II19, and the other end contacts the disc spring 21, to withstand the axial thrust from the other screw of the extruder; one end of the disc spring 21 contacts the thrust bearing 20, and the other end contacts the reducer housing, which is used to compensate for the compression of the long output shaft 14.

[0017] When the input gear shaft 3 rotates counterclockwise / clockwise under the action of external force, the input gear shaft 3 drives the diverter gear I6 and the diverter gear II19 at the same time; the diverter gear I6 drives the distribution shaft I5 to transmit power to the spline shaft 7, the spline shaft 7 is installed in the gear shaft I8, the gear shaft I8 drives the inner and outer gears 9, the inner and outer gears 9 divert the power to the gear shaft II23, and the gear shaft II23 then drives the short output gear shaft 13 at the same time, so that the short output gear shaft 13 rotates clockwise / counterclockwise, and also realizes the first diversion output of the input power;

[0018] When the input gear shaft 3 rotates counterclockwise / clockwise under the action of external force, the input gear shaft 3 simultaneously drives the diverter gear I6 and the diverter gear II19; the diverter gear II19 drives the distribution shaft II18 to transmit power to the long output shaft 14, realizing the clockwise / counterclockwise rotation of the long output shaft 14, and also realizing the second diversion output of the input power.

[0019] The number of the gear shafts II 23 can be 2 to 5 according to the gear transmission strength requirements.

[0020] The internal and external gears 9 can be manufactured into an integral structure or a split combined gear structure.

[0021] The bearing seat I11 and the bearing seat II12 are detachably connected to the reducer housing by bolts and become a part of the reducer housing.

[0022] The diverter gear II 19 is installed on the distribution shaft II 18 through interference fit or flat key connection.

[0023] Beneficial effects of the utility model: The utility model splits the input power in half and transmits it to the short output gear shaft and the long output shaft respectively, and adopts a first-stage gear pair transmission to quickly realize the split output of the input power. The new reducer not only realizes the secondary split of power by setting the gear shaft II, but also increases the center distance of the gear pair of the internal gear transmission, which not only meets the premise of gear design strength but also realizes the industrialization demand of the reducer. Since the secondary split and confluence of power of the new reducer are realized in a set of internal gear meshing gear pairs, the axial length of the housing of the entire reducer is shortened, ensuring that the housing is easier to process, and the processing accuracy of each bearing seat hole is higher. At the same time, the internal meshing split and confluence structure reduces the number of gear pairs, and the number of bearings used in the structure is reduced by nearly 1 / 3, and the purchase cost of bearings is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural diagram of a novel internal gear transmission co-rotating twin-screw reducer of the utility model;

[0025] Figure 2 yes Figure 1 AA section view;

[0026] Figure 3 yes Figure 1 BB cross-sectional view.

[0027] In the figure: 1-upper body; 2-lower body; 3-input gear shaft; 4-shaft end baffle; 5-distribution shaft I; 6-diverter gear I; 7-spline shaft; 8-gear shaft I; 9-inner and outer gears; 10-bearing I; 11-bearing seat I; 12-bearing seat II; 13-short output gear shaft; 14-long output shaft; 15-bearing II; 16-bearing III; 17-tandem bearing; 18-distribution shaft II; 19-diverter gear II; 20-thrust bearing; 21-disc spring; 22-bearing IV; 23-gear shaft II. DETAILED DESCRIPTION

[0028] The utility model will be further described below in conjunction with the accompanying drawings.

[0029] The connection relationship between the various parts is as follows: the upper body 1 and the lower body 2 are combined to form a reducer housing. The splitter gear Ⅰ6 and the splitter gear Ⅱ19 are meshed with the input gear shaft 3 at the same time. The splitter gear Ⅰ6 is installed on the distribution shaft Ⅰ5, and the splines at both ends of the spline shaft 7 are installed in the distribution shaft Ⅰ5 and the gear shaft Ⅰ8 respectively. The input end of the spline shaft 7 is positioned by the shaft end baffle 4 installed at the end of the distribution shaft Ⅰ, and the output end transmits power to the gear shaft Ⅰ8 through the end spline. The internal and external gears 9 are installed and fixed in the reducer housing through the bearing Ⅰ10. The internal and external gears 9 can be made into an integral structure or a split combined gear structure according to the gear strength and cost. The external teeth of the internal and external gears 9 are meshed with the gear shaft Ⅰ8 to transmit power to the internal teeth of the internal and external gears 9. The internal teeth of the internal and external gears 9 simultaneously drive two identical gear shafts Ⅱ23. The two ends of the gear shaft Ⅱ23 are installed in the reducer housing and the bearing seat Ⅰ11 through the bearing Ⅳ22, and the bearing seat Ⅰ11 is installed in the reducer box. Gear shaft II 23 can be set 2-5 according to the gear transmission strength requirements. Gear shaft II 23 is meshed with the short output gear shaft 13 at the same time, driving the short output gear shaft 13 to rotate, thereby transmitting the required power. The two ends of the short output gear shaft 13 are supported and fixed in the reducer housing and the bearing seat II 12 through bearing II 15, and the bearing seat II 12 is connected to the reducer housing. One end of the tandem bearing 17 is installed at the end of the short output gear shaft 13, and the other end is installed in the reducer housing to withstand the axial thrust from the extruder screw. The splitter gear II 19 is installed on the distribution shaft II 18 to transmit power to the long output shaft 14. The two ends of the long output shaft 14 are supported and fixed in the reducer housing through bearing III 16 and pass through the inside of the internal and external gears 9 to achieve power output. The thrust bearing 20 is installed on the distribution shaft II 18, one end contacts the splitter gear II 19, and the other end contacts the butterfly spring 21, and withstands the axial thrust from the other screw of the extruder. One end of the disc spring 21 contacts the thrust bearing 20 , and the other end contacts the housing.

[0030] The working principle of the utility model is as follows:

[0031] The upper body 1 and the lower body 2 are combined to form a reducer housing, which bears the additional load from the gear reducer transmission and the outside. The new reducer housing adopts an upper and lower two-layer structure, which is simple and reliable, easy to process and manufacture, and has a low manufacturing cost. The splitter gear Ⅰ6 and the splitter gear Ⅱ19 are meshed with the input gear shaft 3 at the same time, and the input power is split in half and then transmitted to the short output gear shaft 13 and the long output shaft 14 respectively. The first-level gear pair transmission is used to quickly realize the split output of the input power. The splitter gear Ⅰ6 is installed on the distribution shaft Ⅰ5 to transmit the power to the spline shaft 7. The splines at both ends of the spline shaft 7 are respectively installed in the distribution shaft Ⅰ5 and the gear shaft Ⅰ8. The input end of the spline shaft 7 is positioned by the shaft end baffle 4 installed at the end of the distribution shaft Ⅰ, and the output end transmits the power to the gear shaft Ⅰ8 through the end spline, realizing the axial limit of the spline shaft 7. By changing the diameter and length of the spline shaft 7, the torsion angle error required by the short output gear shaft 13 can be compensated, meeting the torsion angle error requirements of the two output shafts. The inner and outer gears 9 are installed and fixed in the reducer housing through bearings Ⅰ10. The inner and outer gears 9 can be made into an integral structure or a split combined gear structure according to the gear strength and cost. The outer teeth of the inner and outer gears 9 mesh with the gear shaft Ⅰ8 to transmit the diverted power to the inner teeth of the inner and outer gears 9. The two ends of the gear shaft Ⅱ23 are installed in the reducer housing and the bearing seat Ⅰ11 through bearings Ⅳ22. The bearing seat Ⅰ11 is installed in the reducer housing. After the bearing seat Ⅰ11 is set, the bearing seat hole on the output side of the housing is enlarged, making the processing of the outer ring housing seat hole of the bearing Ⅰ10 easier and the accuracy easier to ensure. The inner teeth of the inner and outer gears 9 simultaneously drive two (or more) identical gear shafts Ⅱ23. The gear shafts Ⅱ23 can be set 2-5 according to the gear transmission strength requirements, realizing the secondary diversion of power. By setting the gear shaft Ⅱ23, the new reducer not only realizes the secondary diversion of power, but also increases the center distance of the gear pair of the internal gear transmission, meeting the premise of the gear design strength and realizing the industrialization needs of the reducer. The gear shaft II 23 is meshed with the short output gear shaft 13 at the same time, driving the short output gear shaft 13 to rotate, realizing the confluence after the secondary power diversion, and ensuring the output power demand of the short output gear shaft 13. Since the secondary power diversion and confluence of the new reducer are both realized in a set of internal gear meshing gear pairs, the axial length of the entire reducer housing is shortened, ensuring that the housing is easier to process, and the processing accuracy of each bearing seat hole is higher. At the same time, the internal meshing diversion and confluence structure reduces the number of gear pairs, and the number of bearings used in the structure is reduced by nearly 1 / 3, and the purchase cost of bearings is reduced. The two ends of the short output gear shaft 13 are fixed in the reducer housing and the bearing seat II 12 through the bearing II 15, and the bearing seat II 12 is connected to the reducer housing. One end of the tandem bearing 17 is installed at the end of the short output gear shaft 13, and the other end is installed in the reducer housing to withstand the axial thrust from the extruder screw.The splitter gear Ⅱ19 is installed on the distribution shaft Ⅱ18 through interference fit or flat key connection. The phase error requirements of the output side splines of the two output shafts can be guaranteed by adjusting the circumferential position of the splitter gear Ⅱ19 and the long output shaft 14. At the same time, the splitter gear Ⅱ19 transmits power to the long output shaft 14. The two ends of the long output shaft 14 are supported and fixed in the reducer housing through bearings Ⅲ16 and pass through the inside of the internal and external gears 9 to achieve power output. The thrust bearing 20 is installed on the distribution shaft Ⅱ18, one end of which contacts the splitter gear Ⅱ19 and the other end contacts the butterfly spring 21 to bear the axial thrust from the other screw of the extruder. One end of the butterfly spring 21 contacts the thrust bearing 20 and the other end contacts the reducer housing, which is used to compensate for the compression deformation of the long and short output shafts after the axial thrust of the screw.

[0032] The new type of internal gear transmission co-directional twin-screw reducer has two output shafts running in the same direction:

[0033] Looking at the two output shafts, the two output shafts of the co-rotating twin-screw reducer rotate clockwise.

[0034] Long output shaft steering: Looking at the long output shaft 14, when the input gear shaft 3 rotates counterclockwise, the diverter gear II 19 drives the long output shaft 14 to rotate clockwise, thus achieving the clockwise rotation requirement of the long output shaft.

[0035] Steering of short output shaft: facing the short output gear shaft 13, when the input gear shaft 3 rotates counterclockwise, the diverter gear I6 drives the gear shaft I8 to rotate clockwise through the spline shaft 7. When the gear shaft I8 rotates clockwise, it forces the inner and outer gears 9 meshing with it to rotate counterclockwise. Because the internal teeth of the inner and outer gears 9 and the gear shaft II23 are internal teeth transmission, the gear shaft II23 also rotates counterclockwise. The gear shaft II23 and the short output gear shaft 13 are external teeth meshing transmission, and the transmission direction is opposite, thereby realizing the clockwise rotation requirement of the short output gear shaft 13.

[0036] The new type of internal gear transmission co-directional twin-screw reducer realizes the requirements of torque transmission and steering of two output shafts. At the same time, it can also easily adjust the phase of the two output shaft splines to achieve the compression error compensation requirements. The reducer housing has a simple structure, is easy to process, has high manufacturing precision, and is more cost-effective. It can also meet the requirements of industrial promotion and application of the reducer. All indicators are superior to the reducer with existing structures.

Claims

1. A new type of internal gear transmission co-rotating twin-screw reducer, characterized in that: The novel internal gear transmission co-rotating twin-screw reducer comprises an upper body (1), a lower body (2), an input gear shaft (3), two splitter gears, a gear shaft, internal and external gears (9), a short output gear shaft (13), a long output shaft (14), a tandem bearing (17), a thrust bearing (20), a bearing seat I (11), a bearing seat II (12) and a disc spring (21); The upper body (1) and the lower body (2) are combined together to form a reducer housing, the diverter gear is located on the input side of the reducer housing, and the gear shaft is located on the output side of the reducer housing; The splitter gear includes a splitter gear I (6) and a splitter gear II (19); the gear shaft includes a gear shaft I (8) and a gear shaft II (23); the input gear shaft (3) is meshed with the splitter gear I (6) and the splitter gear II (19) at the same time to realize the split transmission of the input power; The splitter gear I (6) is mounted on the distribution shaft I (5); the two ends of the spline shaft (7) are respectively mounted in the distribution shaft I (5) and the gear shaft I (8) through splines; the output end of the spline shaft (7) transmits power to the gear shaft I (8) through the end splines; The gear shaft I (8) meshes with the outer teeth of the inner and outer gears (9) to transmit power to the inner teeth of the inner and outer gears (9), and the inner and outer gears (9) are installed in the reducer housing through bearings I (10); A plurality of gear shafts II (23) are arranged inside the inner and outer gears (9), and the inner teeth of the inner and outer gears (9) simultaneously drive the plurality of identical gear shafts II (23), and the plurality of gear shafts II (23) simultaneously mesh with the short output gear shaft (13), driving the short output gear shaft (13) to rotate, thereby transmitting the required power; both ends of the gear shaft II (23) are installed in the reducer housing and the bearing seat I (11) through bearings IV (22), and the bearing seat I (11) is installed in the reducer housing; The two ends of the short output gear shaft (13) are supported and fixed in the reducer housing and the bearing seat II (12) through bearing II (15), and the bearing seat II (12) is connected to the reducer housing; one end of the tandem bearing (17) is installed at the end of the short output gear shaft (13), and the other end is installed in the reducer housing to bear the axial thrust from the extruder screw; The diverter gear II (19) is installed on the distribution shaft II (18); one end of the long output shaft (14) is connected to one side of the distribution shaft II (18), and the other end passes through the inside of the internal and external gears (9) and is supported and fixed in the reducer housing through the bearing III (16), so as to achieve the power output requirement of the long output shaft (14); a thrust bearing (20) is installed on the other side of the distribution shaft II (18), one end of which contacts the diverter gear II (19) and the other end contacts the disc spring (21), so as to bear the axial thrust from the other screw of the extruder; one end of the disc spring (21) contacts the thrust bearing (20) and the other end contacts the reducer housing, so as to compensate for the compression of the long output shaft (14).

2. The novel internal gear transmission co-rotating twin-screw reducer according to claim 1 is characterized in that: When the input gear shaft (3) rotates counterclockwise / clockwise under the action of external force, the input gear shaft (3) simultaneously drives the diverter gear I (6) and the diverter gear II (19); the diverter gear I (6) drives the distribution shaft I (5) to transmit power to the spline shaft (7); the spline shaft (7) is installed in the gear shaft I (8); the gear shaft I (8) drives the inner and outer gears (9); the inner and outer gears (9) divert the power to the gear shaft II (23); the gear shaft II (23) then simultaneously drives the short output gear shaft (13), so that the short output gear shaft (13) rotates clockwise / counterclockwise, and at the same time, the first diversion output of the input power is also realized; When the input gear shaft (3) rotates counterclockwise / clockwise under the action of external force, the input gear shaft (3) simultaneously drives the diverter gear I (6) and the diverter gear II (19); the diverter gear II (19) drives the distribution shaft II (18) to transmit power to the long output shaft (14), thereby realizing the clockwise / counterclockwise rotation of the long output shaft (14), and also realizing the second diversion output of the input power.

3. The novel internal gear transmission co-rotating twin-screw reducer according to claim 1 or 2, characterized in that: The number of the gear shafts II (23) is 2 to 5 according to the gear transmission strength requirement.

4. The novel internal gear transmission co-rotating twin-screw reducer according to claim 3 is characterized in that: The internal and external gears (9) are manufactured into an integral structure or a split combined gear structure.

5. The novel internal gear transmission co-rotating twin-screw reducer according to claim 1, 2 or 4, characterized in that: The bearing seat I (11) and the bearing seat II (12) are detachably connected to the reducer housing by bolts and become a part of the reducer housing.

6. The novel internal gear transmission co-rotating twin-screw reducer according to claim 5 is characterized in that: The diverter gear II (19) is installed on the distribution shaft II (18) through interference fit or flat key connection.

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