Self-cooling planetary reducer for injection molding machine

Abstract

The utility model discloses a kind of self-cooled planetary reducer for injection molding machine, including input flange, output flange and planetary reduction mechanism, planetary reduction mechanism includes sun gear, planetary gear, inner ring gear and planet carrier output shaft, input flange, output flange and sun gear are coaxially connected with planet carrier output shaft respectively, sun gear is driven by servo motor, planetary gear adopts double tooth structure, sun gear and inner ring gear are engaged with planetary gear respectively, the both sides of inner ring gear are fixedly connected with input flange and output flange, the outside of inner ring gear is installed with detachable cooling ring, cooling ring is fixedly connected with input flange by screw, cooling groove is arranged between cooling ring and inner ring gear, cooling inlet and cooling outlet are arranged on cooling ring.The reducer can meet the use requirement of injection molding machine in limited installation space, effectively solve the overheating problem of reducer caused by long time work of injection molding machine, significantly improve the transmission efficiency of planetary reducer and prolong the service life of parts.

Description

Technical Field

[0001] This utility model relates to the technical field of planetary reducers for engineering machinery, specifically to a self-cooling planetary reducer for injection molding machines. Background Technology

[0002] Planetary gearboxes have been increasingly widely used in machinery and equipment across various fields, including defense, metallurgy, hoisting and transportation, mining machinery, chemical equipment, textile machinery, electronics manufacturing, smart homes, industrial robots, and construction engineering. However, with the continuous development and advancement of injection molding machine technology, traditional NGW planetary gearboxes are finding it increasingly difficult to meet the current demands of injection molding machines in terms of technical parameter matching and installation space requirements. This forces equipment manufacturers to opt for NGW planetary gearboxes with larger outer frame dimensions or more expensive parallel shaft gearboxes. Furthermore, it is worth noting that under the unique high-temperature and high-load conditions of injection molding machines, existing air-cooling methods have limited effectiveness. This leads to severe overheating of the gearbox during operation, resulting in excessively high internal temperatures, increased internal pressure, and accelerated gear wear. Ultimately, this significantly reduces the overall transmission efficiency of the gearbox and drastically shortens its service life. Utility Model Content

[0003] To address the aforementioned technical problems, this utility model proposes a self-cooling planetary reducer for injection molding machines. This reducer can meet the usage requirements of injection molding machines within a limited installation space and effectively solve the problem of overheating of the reducer caused by long-term operation of the injection molding machine. This significantly improves the transmission efficiency of the planetary reducer and extends the service life of its components.

[0004] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a self-cooled planetary reducer for injection molding machines, including an input flange, an output flange, and a planetary reduction mechanism. The planetary reduction mechanism includes a sun gear, planet gears, an internal gear ring, and a planet carrier output shaft. The input flange, output flange, and sun gear are coaxially connected to the planet carrier output shaft via bearings. The sun gear is driven by a servo motor. The planet gears are connected to the planet carrier output shaft via pins. The planet gears adopt a double-tooth structure. The sun gear and the internal gear ring mesh with the planet gears respectively. The internal gear ring is located on the outside of the planet carrier output shaft and the planet gears. The two sides of the internal gear ring are fixedly connected to the input flange and the output flange respectively. A detachable cooling ring is installed on the outside of the internal gear ring. The cooling ring is fixedly connected to the input flange by screws. A cooling groove is provided between the cooling ring and the internal gear ring. The cooling ring is provided with a coolant inlet and a coolant outlet communicating with the cooling groove.

[0005] The planetary gears of this reducer adopt a double-tooth structure, which can meet the usage requirements of injection molding machines within a limited installation space. When the reducer is working, the servo motor drives the sun gear to rotate. Through the two-stage meshing reduction between the sun gear and planetary gears, and between the planetary gears and the internal gear ring, the reduction ratio and output torque can be improved while keeping the axial length of the reducer constant, thereby efficiently driving the feeding system of the injection molding machine.

[0006] This utility model's reducer features a cooling ring and cooling groove installed on the outer side of the internal gear ring, effectively solving the overheating problem caused by prolonged operation of the injection molding machine. This significantly improves the transmission efficiency of the planetary reducer and extends the service life of its components. During operation, the reducer circulates coolant into the cooling groove, achieving good heat dissipation and promptly removing the heat generated during the planetary reduction mechanism's operation, meeting the stable operation requirements under high-temperature and high-load conditions. Under low-load conditions with minimal temperature rise, the cooling ring can be removed, allowing for direct air cooling to achieve energy conservation and reduced consumption.

[0007] Preferably, the outer peripheral wall of the internal gear ring has a plurality of first grooves, which are spaced apart along the axial direction of the internal gear ring. The inner peripheral wall of the cooling ring has a second groove opposite to the positions of the plurality of first grooves. The second groove and the plurality of first grooves constitute the cooling groove. The design of the first and second grooves ensures a larger heat dissipation area, extends the flow path of the coolant, and further improves the heat dissipation efficiency.

[0008] Preferably, the input flange is coaxially connected to the planetary carrier output shaft via a first single-row angular contact bearing, the output flange is coaxially connected to the planetary carrier output shaft via a second single-row angular contact bearing, and the sun gear is coaxially connected to the planetary carrier output shaft via a deep groove ball bearing. This invention achieves the connection between the planetary carrier output shaft and the input flange, output flange, and sun gear through two single-row angular contact bearings and one deep groove ball bearing, enabling it to withstand greater axial forces and improving the axial load-bearing capacity of the reducer.

[0009] Preferably, the end of the planetary carrier output shaft is machined with bearing holes, and the deep groove ball bearing is installed in the bearing holes. Traditionally, bearing holes are machined on the input flange. This invention machines the bearing holes at the end of the planetary carrier output shaft, connecting the sun gear and the planetary carrier output shaft via a deep groove ball bearing to form an integrated structure. This effectively improves the meshing accuracy of the sun gear and planet gears, enhances the transmission accuracy of the reducer, and reduces the operating noise of the planetary reduction mechanism.

[0010] Preferably, a needle roller bearing without an inner ring is provided between the planetary gear and the pin shaft to increase the radial load capacity of the planetary gear.

[0011] Compared with existing technologies, this utility model has the following advantages: The planetary gears of the self-cooled planetary reducer for injection molding machines of this utility model adopt a double-tooth structure, and a cooling ring and cooling groove are installed on the outer side of its internal gear ring. When the reducer is working, the servo motor drives the sun gear to rotate. Through the two-stage meshing reduction between the sun gear and the planetary gears, and between the planetary gears and the internal gear ring, the reduction ratio and output torque can be improved while keeping the axial length of the reducer constant, thereby efficiently driving the feeding system of the injection molding machine. This reducer can meet the usage requirements of the injection molding machine within a limited installation space, and effectively solves the problem of reducer overheating caused by long-term operation of the injection molding machine, thereby significantly improving the transmission efficiency of the planetary reducer and extending the service life of the components. Attached Figure Description

[0012] Figure 1 This is an assembly diagram of the self-cooled planetary reducer used in the injection molding machine in the embodiment;

[0013] Figure 1 The specific reference numerals in the attached figures are as follows:

[0014] 1-Input flange, 2-Output flange, 3-Sun gear, 4-Planet gear, 5-Internal gear ring, 51-Cooling ring, 52-Screw, 53-Coolant outlet, 54-First groove, 55-Second groove, 6-Planet carrier output shaft, 61-First single-row angular contact bearing, 62-Second single-row angular contact bearing, 63-Deep groove ball bearing, 64-Bearing hole, 7-Pin, 71-Needle roller bearing without inner ring. Detailed Implementation

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Components or structures not limited in this invention employ conventional techniques in the art.

[0016] The self-cooled planetary reducer for injection molding machines in the embodiment, such as Figure 1As shown, the system includes an input flange 1, an output flange 2, and a planetary reduction mechanism. The planetary reduction mechanism includes a sun gear 3, planet gears 4, an internal gear ring 5, and a planetary carrier output shaft 6. The input flange 1 is coaxially connected to the planetary carrier output shaft 6 via a first single-row angular contact bearing 61. The output flange 2 is coaxially connected to the planetary carrier output shaft 6 via a second single-row angular contact bearing 62. The sun gear 3 is coaxially connected to the planetary carrier output shaft 6 via a deep groove ball bearing 63. Specifically, the end of the planetary carrier output shaft 6 has a bearing hole 64, and the deep groove ball bearing 63 is installed in the bearing hole 64. The sun gear 3 is driven by a servo motor (not shown in the figure), and the planet gears 4 and 5 are connected to the planetary carrier output shaft 6. The output shaft 6 is connected by a pin 7. A needle roller bearing 71 without an inner ring is provided between the planetary gear 4 and the pin 7. The planetary gear 4 adopts a double-tooth structure. The sun gear 3 and the internal gear ring 5 mesh with the planetary gear 4 respectively. The internal gear ring 5 is located on the outside of the planetary carrier output shaft 6 and the planetary gear 4. The two sides of the internal gear ring 5 are fixedly connected to the input flange 1 and the output flange 2 respectively. A detachable cooling ring 51 is installed on the outside of the internal gear ring 5. The cooling ring 51 is fixedly connected to the input flange 1 by screws 52. A cooling groove is provided between the cooling ring 51 and the internal gear ring 5. The cooling ring 51 is provided with a coolant inlet (not shown in the figure) and a coolant outlet 53 that communicate with the cooling groove.

[0017] In this embodiment, three first grooves 54 are provided on the outer peripheral wall of the internal gear ring 5. The three first grooves 54 are spaced apart along the axial direction of the internal gear ring 5. A second groove 55 is provided on the inner peripheral wall of the cooling ring 51, which is opposite to the position of the three first grooves 54. The second groove 55 and the three first grooves 54 constitute a cooling groove.

[0018] When the aforementioned reducer is working, the servo motor drives the sun gear 3 to rotate. Through the two-stage meshing reduction between the sun gear 3 and the planet gear 4, and between the planet gear 4 and the internal gear ring 5, the reduction ratio and output torque can be increased while keeping the axial length of the reducer constant, thereby efficiently driving the feeding system of the injection molding machine.

[0019] During operation, the aforementioned reducer achieves good heat dissipation by circulating coolant into the cooling tank, effectively removing the heat generated during the planetary reduction mechanism's operation and meeting the requirements for stable operation under high-temperature and high-load conditions. Under low-load conditions with minimal temperature rise, the cooling ring 51 can be removed, allowing for direct air cooling to achieve energy savings and reduced consumption.

[0020] The aforementioned reducer can meet the usage requirements of injection molding machines within a limited installation space, and effectively solve the problem of reducer overheating caused by long-term operation of injection molding machines, thereby significantly improving the transmission efficiency of planetary reducers and extending the service life of components.

Claims

1. A self-cooled planetary reducer for injection molding machines, characterized in that, The device includes an input flange, an output flange, and a planetary reduction mechanism. The planetary reduction mechanism includes a sun gear, planet gears, an internal gear ring, and a planet carrier output shaft. The input flange, output flange, and sun gear are coaxially connected to the planet carrier output shaft via bearings. The sun gear is driven by a servo motor. The planet gears are connected to the planet carrier output shaft via pins. The planet gears adopt a double-tooth structure. The sun gear and the internal gear ring mesh with the planet gears. The internal gear ring is located outside the planet carrier output shaft and the planet gears. Both sides of the internal gear ring are fixedly connected to the input flange and the output flange, respectively. A detachable cooling ring is installed on the outer side of the internal gear ring. The cooling ring is fixedly connected to the input flange by screws. A cooling groove is provided between the cooling ring and the internal gear ring. The cooling ring has a coolant inlet and a coolant outlet communicating with the cooling groove.

2. The self-cooled planetary reducer for injection molding machines according to claim 1, characterized in that, The outer peripheral wall of the internal gear ring is provided with a plurality of first grooves, which are spaced apart along the axial direction of the internal gear ring. The inner peripheral wall of the cooling ring is provided with a second groove that is opposite to the position of the plurality of first grooves. The second groove and the plurality of first grooves constitute the cooling groove.

3. The self-cooled planetary reducer for injection molding machines according to claim 1, characterized in that, The input flange is coaxially connected to the planetary carrier output shaft via a first single-row angular contact bearing, the output flange is coaxially connected to the planetary carrier output shaft via a second single-row angular contact bearing, and the sun gear is coaxially connected to the planetary carrier output shaft via a deep groove ball bearing.

4. The self-cooled planetary reducer for injection molding machines according to claim 3, characterized in that, The planetary carrier output shaft has a bearing hole at its end, and the deep groove ball bearing is installed in the bearing hole.

5. The self-cooled planetary reducer for injection molding machines according to claim 1, characterized in that, A needle roller bearing without an inner ring is provided between the planetary gear and the pin shaft.

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