Multifunctional transmission speed reducer and power device for coal mine hydraulic support

Abstract

The utility model relates to a kind of multifunctional transmission speed reducer and power device for coal mine hydraulic support, it includes shell, heavy load input shaft, first transmission mechanism, light load input shaft and second transmission mechanism;Heavy load input shaft is rotatably matched with shell, and heavy load input shaft is used to be connected with lockable first motor;Second transmission mechanism includes first ring gear, first planet carrier and first planetary gear, first ring gear is rotatably connected with first planet carrier, first planet carrier is rotatably connected with shell, first planetary gear is rotatably installed on first planet carrier, light load input shaft is rotatably connected with first planet carrier and is engaged with first planetary gear;Heavy load input shaft is connected with the input portion of first transmission mechanism, the output portion of first transmission mechanism is engaged with the outer tooth portion of first ring gear, and first planetary gear is engaged with the inner tooth portion of first ring gear;Light load input shaft is used to be connected with lockable second motor.Structure is reasonable, and use range is wide, and maintenance cost is low.

Description

Technical Field

[0001] This utility model relates to the field of transmission device technology, and more specifically, to a multi-functional transmission reducer and power device for hydraulic supports in coal mines. Background Technology

[0002] Hydraulic supports in coal mines, as key support equipment in fully mechanized mining faces, traditionally rely on centralized hydraulic pump stations for their actuators (such as columns and jacks). While this hydraulic transmission method has the inherent advantage of high power density, it reveals several significant problems under long-term continuous operation in underground coal mines: First, the hydraulic system requires the pump station to maintain continuous high pressure standby, and the valve group throttling losses are large, resulting in high overall energy consumption and severe overheating. Second, hydraulic components are sensitive to oil contamination, and seals are prone to wear and aging, leading to increased leakage within the system. This not only causes delayed support response and reduced pressure holding capacity but also significantly increases the equipment's life-cycle cost due to frequent maintenance and replacement. Third, high-pressure hoses and joints pose a risk of sudden leakage in the humid and dusty underground environment. Leaking hydraulic oil not only pollutes the working environment but may also cause safety hazards, which is incompatible with the requirements of green mine construction. To address these drawbacks, in recent years the industry has begun to explore replacing hydraulic cylinders with electric actuators for support operations. Among them, electric heavy-duty cylinders have become a research hotspot due to their advantages such as high control precision, fast response, and no oil leakage. However, in the actual cyclic process of coal mine hydraulic supports, there are two typical and very different load conditions: the rapid support movement and light load relief stages require the actuator to extend or retract at high speed, with long strokes and small loads, requiring high output speed and low torque; while the active support and relief reset stages require a large thrust to resist the roof pressure, with short strokes and extremely large loads, requiring extremely high output torque and extremely low speed. A single speed ratio reduction transmission device cannot simultaneously accommodate these two extreme conditions. If the speed ratio is designed to be too large, the speed will be too slow in the light load stage, affecting coal mining efficiency; if the speed ratio is too small, a very high-power motor will be required in the heavy load stage, resulting in a sharp increase in size, weight, and cost. Moreover, the high-power motor will be severely underloaded under light load conditions, and its efficiency will drop significantly. Utility Model Content

[0003] The purpose of this utility model includes, for example, providing a multi-functional transmission reducer and power unit for hydraulic supports in coal mines, which can switch working states as needed to adapt to different working scenarios, and is stable and reliable in operation with low maintenance costs.

[0004] The embodiments of this utility model can be implemented as follows: In a first aspect, this utility model provides a multi-functional transmission reducer for hydraulic supports in coal mines, comprising: The housing, and the heavy-duty input shaft, the first transmission mechanism, the light-duty input shaft, and the second transmission mechanism, all mounted on the housing; The heavy-duty input shaft is rotatably engaged with the housing, and the heavy-duty input shaft is used to connect to a lockable first motor; the second transmission mechanism includes a first gear ring, a first planetary carrier, and a first planetary gear, the first gear ring is rotatably connected to the first planetary carrier, the first planetary carrier is rotatably connected to the housing, the first planetary gear is rotatably mounted on the first planetary carrier, and the light-duty input shaft is rotatably connected to the first planetary carrier and meshes with the first planetary gear; The heavy-load input shaft is connected to the input part of the first transmission mechanism, the output part of the first transmission mechanism meshes with the outer tooth of the first gear ring, and the first planetary gear meshes with the inner tooth of the first gear ring; the light-load input shaft is used to connect to a lockable second motor.

[0005] In an optional embodiment, the housing includes a box and an input bearing housing, the top of the box being open, and the input bearing housing being connected to the box and closing the open; The two ends of the heavy-duty input shaft are rotatably connected to the housing and the input bearing seat, respectively; the two ends of the first planetary carrier are rotatably connected to the housing and the input bearing seat, respectively.

[0006] In an optional embodiment, the first transmission mechanism includes a parallel gear transmission mechanism, the heavy-duty input shaft is connected to the input part of the parallel gear transmission mechanism, and the output part of the parallel gear transmission mechanism meshes with the external gear part.

[0007] In an optional embodiment, the parallel gear transmission mechanism includes a transmission gear shaft and a transmission gear. The transmission gear shaft is rotatably mounted inside the housing, and the transmission gear is sleeved and fixed outside the transmission gear shaft. The transmission gear and the transmission teeth on the transmission gear shaft are arranged axially on the transmission gear shaft. The heavy-duty input shaft meshes with the transmission gear, and the transmission teeth mesh with the external teeth.

[0008] In an optional embodiment, the first planetary carrier has an internal mounting hole, and the light-load input shaft is inserted into the mounting hole. The light-load input shaft is rotatably connected to the wall of the mounting hole via a bearing.

[0009] In an optional embodiment, the second transmission mechanism further includes a first support base and a second support base. The first support base, the first gear ring, and the second support base are rotatably sleeved on the outside of the first planetary carrier and arranged sequentially in the axial direction of the light-load input shaft. The first gear ring is also fixedly connected to the first support base and the second support base.

[0010] In an optional embodiment, the second transmission mechanism further includes a second sun gear, a second ring gear, a second planet carrier, and a second planet gear. One end of the second sun gear is connected to the first planet carrier, and the other end is connected to the second planet carrier. The second planet carrier is rotatably connected to the housing. The second planet gear is rotatably mounted on the second planet carrier, and the second ring gear is fixedly connected to the housing. The second sun gear meshes with the second planet gear, and the second planet gear meshes with the second ring gear.

[0011] In an optional embodiment, the bottom of the housing is provided as an opening, the second gear ring is fixed to the bottom of the housing, one end of the second planetary carrier extends into the housing from the opening and is rotatably connected to the housing, and the other end of the second planetary carrier extends out of the second gear ring and is rotatably connected to the second gear ring.

[0012] In an optional embodiment, an oil seal assembly is provided between the second planetary carrier and the second gear ring.

[0013] Secondly, this utility model provides a power device, the power device comprising: The lockable first motor, the lockable second motor, and the multi-functional transmission reducer for coal mine hydraulic supports as described in any of the foregoing embodiments are provided. The lockable first motor and the lockable second motor are both mounted on the housing and located on the same side of the housing. The lockable first motor is connected to the heavy-duty input shaft, and the lockable second motor is connected to the light-duty input shaft.

[0014] The beneficial effects of this utility model embodiment include, for example: This application arranges a heavy-load input shaft and a light-load input shaft in parallel within the housing, and coordinates them with a first transmission mechanism and a second transmission mechanism. The heavy-load input shaft drives the outer teeth of the first gear ring via the first transmission mechanism, while the light-load input shaft is directly and rotatably engaged with the first planetary carrier and meshes with the first planetary gears. The inner teeth of the first gear ring also mesh with the first planetary gears, thus forming two independent power paths that can lock and constrain each other. Specifically, when the lockable first motor (i.e., the heavy-load motor) is operating and the lockable second motor (i.e., the light-load motor) is locked, the heavy-load power is input to the first gear ring after being reduced in speed and increased in torque via the first transmission mechanism. With the light-load input shaft locked as the fixed end of the sun gear, the power transmission path from the inner teeth of the first gear ring, through the first planetary gears, to the first planetary carrier effectively forms a cascaded superposition of the planetary gear sets of the first and second transmission mechanisms. This achieves a high-ratio reduction output with a compact two-stage series structure, meeting the low-speed, high-torque requirements of the heavy-load support bracket. When the light-load motor is working and the heavy-load motor is locked, the first gear ring is rigidly locked through the first transmission mechanism. The light-load input shaft directly drives the first planetary gear to rotate the first planetary carrier. The power is output after a single-stage reduction through the second transmission mechanism, forming a high-speed path of short chain transmission, which meets the high response speed required for rapid movement of the support. The heavy-load motor and the light-load motor can achieve rigid conversion between the two speed ratios by switching the locking state. There is no need for a clutch or shift fork mechanism throughout the process, which avoids power interruption and shift shock, and greatly reduces the axial size and number of parts of the transmission device. At the same time, under the heavy-load path, the first transmission mechanism can flexibly expand the number of transmission stages according to the actual load requirements, so that the heavy-load motor can be selected with a smaller power specification without losing output capacity. Under the light-load path, the no-load loss of the first transmission mechanism is skipped and the output is directly output, so the transmission efficiency under the light-load condition is significantly higher than that of the traditional single speed ratio scheme.

[0015] Based on the above structure, this application achieves adaptive speed ratio distribution under heavy and light load conditions by interlocking the switching of two transmission chains without increasing the complexity of the shifting mechanism. This reduces the overall installed power and operating energy consumption, and the all-electric drive structure completely eliminates the risk of hydraulic leakage. Thus, it balances high reliability, fast response and low maintenance cost in the confined space of underground coal mines, providing a practical transmission solution for the engineering application of electric hydraulic supports. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1This is a schematic diagram of the structure of the multi-functional transmission reducer for coal mine hydraulic supports provided in this embodiment; Figure 2 This is a schematic diagram of the internal structure of the multi-functional transmission reducer for coal mine hydraulic supports provided in this embodiment; Figure 3 This is a cross-sectional structural diagram of the multi-functional transmission reducer for coal mine hydraulic supports provided in this embodiment.

[0018] icon: 100 - Housing; 110 - Housing; 120 - Input bearing housing; 200 - Heavy-duty input shaft; 300 - First transmission mechanism; 310 - Transmission gear shaft; 320 - Transmission gear; 400 - Light-duty input shaft; 500 - Second transmission mechanism; 510 - First gear ring; 520 - First planetary carrier; 530 - First planetary gear; 540 - First support seat; 550 - Second support seat; 560 - Second sun gear; 570 - Second gear ring; 580 - Second planetary carrier; 590 - Second planetary gear; 600 - Oil seal assembly. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0023] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0024] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0025] Please refer to Figures 1-3 This embodiment provides a multi-functional transmission reducer for hydraulic supports in coal mines, comprising a housing 100 and a heavy-duty input shaft 200, a first transmission mechanism 300, a light-duty input shaft 400, and a second transmission mechanism 500, all mounted on the housing 100. The heavy-duty input shaft 200 is rotatably coupled to the housing 100 and is used to connect to a lockable first motor. The second transmission mechanism 500 includes a first gear ring 510, a first planetary carrier 520, and a first planetary gear 530, wherein the first gear ring 510 and the first planetary carrier 520 are rotatable. The first planetary carrier 520 is rotatably connected to the housing 100, and the first planetary gear 530 is rotatably mounted on the first planetary carrier 520. The light-load input shaft 400 is rotatably connected to the first planetary carrier 520 and meshes with the first planetary gear 530. The heavy-load input shaft 200 is connected to the input part of the first transmission mechanism 300, the output part of the first transmission mechanism 300 meshes with the external teeth of the first gear ring 510, and the first planetary gear 530 meshes with the internal teeth of the first gear ring 510. The light-load input shaft 400 is used to connect to a lockable second motor.

[0026] As described above, the working principle of the multi-functional transmission reducer for coal mine hydraulic supports provided in this embodiment is as follows: Please refer to Figure 2In this embodiment, the multi-functional transmission reducer operates based on dual-motor interlocking switching to achieve two speed ratio outputs. Under heavy-load support conditions, the lockable first motor, i.e., the heavy-load motor, starts and drives the heavy-load input shaft 200, while the lockable second motor, i.e., the light-load motor, locks to fix the light-load input shaft 400. The heavy-load power, after being reduced in speed and increased in torque by the first transmission mechanism 300, drives the external teeth of the first gear ring 510, causing the first gear ring 510 to rotate. Since the light-load input shaft 400 is in a locked state, and the light-load input shaft 400 is rotatably connected to the first planetary carrier 520, the light-load input shaft 400 acts as a fixed sun gear, maintaining mesh with the first planetary gear 530, forcing the first planetary gear 530 to rotate. While rotating around its own axis, the first planetary carrier 520 is driven to revolve around the light-load input shaft 400. At this time, the first gear ring 510 serves as the power input end and the first planetary carrier 520 serves as the output end. The light-load input shaft 400 acts as a fixed support point due to locking. The power is transmitted to the first planetary carrier 520 through the first gear ring 510 and the first planetary gear 530, realizing the differential reduction output in the second transmission mechanism 500. Then, it is transmitted to the working machine through the subsequent output stage. In this path, the first transmission mechanism 300 and the second transmission mechanism 500 jointly participate in the reduction, forming a high speed ratio, low speed, and high torque output. Under light-load rapid frame shifting conditions, the heavy-load motor locks to fix the first transmission mechanism 300 and the first gear ring 510, while the light-load motor starts to drive the light-load input shaft 400 to rotate. Because the first gear ring 510 is fixed, the light-load input shaft 400 directly drives the first planetary gear 530 meshing with it. The first planetary gear 530 rolls on the internal teeth of the first gear ring 510 and drives the first planetary carrier 520 to rotate and output power. In this path, the power is reduced by a single stage through the second transmission mechanism 500, skipping the first transmission mechanism 300, forming a short-chain high-speed transmission. The two motors can achieve rigid switching of two speed ratios by switching the locking state, without the need for a clutch or shifting mechanism, and there is no power interruption during the switching process.

[0027] The following embodiments illustrate the details of the multi-functional transmission reducer for coal mine hydraulic supports of this application by way of example.

[0028] Please refer to Figures 1-3In this embodiment, optionally, the multi-functional transmission reducer for coal mine hydraulic supports includes a housing 100 and a heavy-duty input shaft 200, a first transmission mechanism 300, a light-duty input shaft 400, and a second transmission mechanism 500, all mounted on the housing 100. The heavy-duty input shaft 200 cooperates with the first transmission mechanism 300, the first transmission mechanism 300 cooperates with the second transmission mechanism 500, and the light-duty input shaft 400 cooperates with the second transmission mechanism 500. In one working state, the light-duty input shaft 400 can be locked, and after the heavy-duty input shaft 200 inputs power, it is output after speed adjustment by the first transmission mechanism 300 and the second transmission mechanism 500. In another working state, the heavy-duty input shaft 200 can be locked, and after the light-duty input shaft 400 inputs power, it is output after speed adjustment only by the second transmission mechanism 500. In this way, the working state can be adjusted as needed according to the actual working conditions, and the application range is wide.

[0029] Please refer to Figure 2 Optionally, the housing 100 includes a box 110 and an input bearing seat 120. The top of the box 110 is open, and the bottom is also open. The input bearing seat 120 is provided with a first mounting hole and a second mounting hole. The input bearing seat 120 can be bolted to the top of the box 110, and the input bearing seat 120 can close the open. Simultaneously, the first and second mounting holes can communicate with the inner cavity of the box 110. During installation, the heavy-duty input shaft 200 passes through the first mounting hole and is inserted into the box 110. The heavy-duty input shaft 200 can be rotatably connected to the input bearing seat 120 and the box 110 via two bearings respectively. The top end of the heavy-duty input shaft 200 extends out of the input bearing seat 120 and can be connected to a lockable first motor.

[0030] It should be understood that both the heavy-duty input shaft 200 and the light-duty input shaft 400 can be configured as gear shafts. The outer circumferential surface of the heavy-duty input shaft 200 can be provided with a spline structure for connection to the lockable first motor, and this spline structure extends out of the input bearing housing 120. Simultaneously, the outer circumferential surface of the light-duty input shaft 400 can be provided with a spline structure for connection to the lockable second motor, and this spline structure extends out of the input bearing housing 120. Both the heavy-duty input shaft 200 and the light-duty input shaft 400 extend from the same side of the input bearing housing 120, facilitating their engagement with the motor.

[0031] Please refer to Figure 2 Optionally, the first transmission mechanism 300 includes a parallel gear transmission mechanism, the heavy-duty input shaft 200 is connected to the input part of the parallel gear transmission mechanism, and the output part of the parallel gear transmission mechanism is connected to the second transmission mechanism 500.

[0032] It should be understood that the number of gears and speed ratio of the parallel gear transmission mechanism can be designed according to requirements. For example, in this embodiment, the parallel gear transmission mechanism includes a transmission gear shaft 310 and a transmission gear 320. The transmission gear shaft 310 is located inside the housing 110, and both ends of the transmission gear shaft 310 are rotatably connected to the housing 110 and the input bearing seat 120 respectively through a bearing. The transmission gear 320 is sleeved and fixed outside the transmission gear shaft 310, and the transmission teeth of the transmission gear 320 and the transmission gear shaft 310 are arranged axially on the transmission gear shaft 310. The heavy-duty input shaft 200 meshes with the transmission gear 320, and the transmission teeth are connected to the second transmission mechanism 500.

[0033] Please refer to Figures 1-3In this embodiment, optionally, the second transmission mechanism 500 includes a first gear ring 510, a first planet carrier 520, a first planet gear 530, a first support seat 540, a second support seat 550, a second sun gear 560, a second gear ring 570, a second planet carrier 580, and a second planet gear 590. The outer circumferential surface of the first gear ring 510 is provided with external teeth, and the inner circumferential surface of the second gear ring 570 is provided with internal teeth. The external teeth mesh with the input gear shaft. The first support seat 540, the first gear ring 510, and the second support seat 550 are all sleeved on the outside of the first planetary carrier 520 and arranged sequentially in the extension direction of the preset axis. The first support seat 540 and the second support seat 550 are rotatably connected to the first planetary carrier 520 through corresponding bearings. The first gear ring 510 is clamped between the first support seat 540 and the second support seat 550. The first gear ring 510 can be fixedly connected to the first support seat 540 and the second support seat 550 by bolts. The position of the first gear ring 510 is stable and reliable, and it can rotate stably relative to the first planetary carrier 520. The interior of the first planetary carrier 520 is a hollow structure, that is, it is provided with mounting holes. The upper end of the first planetary carrier 520 is rotatably connected to the input bearing seat 120 through a bearing, and the lower end of the first planetary carrier 520 is rotatably connected to the housing 110 through a bearing. A light-load input shaft 400 passes through a mounting hole. Both ends of the light-load input shaft 400 are rotatably connected to a first planetary carrier 520 via corresponding bearings. A preset axis is coaxial with both the mounting hole and the light-load input shaft 400; that is, the extension direction of the preset axis is consistent with the axial direction of both the mounting hole and the light-load input shaft 400. The number of first planetary gears 530 is set as needed. The first planetary gears 530 are rotatably mounted on the first planetary carrier 520 via bearings, and multiple first planetary gears 530 are evenly spaced around the light-load input shaft 400. All first planetary gears 530 mesh with the internal teeth of the light-load input shaft 400 and the first gear ring 510. One end of the second sun gear 560 can be connected to the bottom of the first planetary carrier 520 via a spline structure, and the other end of the second sun gear 560 can be connected to the top of the second planetary carrier 580 via a spline structure. The top of the second planetary carrier 580 extends into the housing 110 through an opening and is rotatably connected to the housing 110 via a bearing. The second ring gear 570 is mounted on the bottom of the housing 110 and can be fixedly connected to the housing 110 via bolts. The bottom of the second planetary carrier 580 extends beyond the second ring gear 570. A bearing and an oil seal assembly 600 can be provided between the second planetary carrier 580 and the second ring gear 570, with the oil seal assembly 600 located outside the bearing. There can be multiple second planet gears 590, all of which are rotatably mounted on the second planetary carrier 580. The multiple second planet gears 590 are evenly spaced around the second sun gear 560, and all of the second planet gears 590 simultaneously mesh with the second sun gear 560 and the second ring gear 570.Thus, the second planetary carrier 580, as an output terminal, can be connected to the load.

[0034] It should be noted that both the lockable first motor and the lockable second motor can be commercially available electromagnetic brake motors or worm gear motors. The lockable first motor is connected to the heavy-load input shaft 200 via its output shaft, enabling it to either rotate or lock the heavy-load input shaft 200. Similarly, the lockable second motor is connected to the light-load input shaft 400 via its output shaft, enabling it to either rotate or lock the light-load input shaft 400.

[0035] The multi-functional transmission reducer for coal mine hydraulic supports provided in this embodiment, through the coordinated design of heavy-load input shaft 200, light-load input shaft 400, first transmission mechanism 300 and second transmission mechanism 500, achieves adaptive speed ratio distribution under heavy-load and light-load conditions by interlocking the switching of two transmission chains. This reduces the overall installed power and operating energy consumption, and the all-electric drive structure completely eliminates the risk of hydraulic leakage. Thus, it balances high reliability, fast response and low maintenance cost in the confined space of underground coal mines, providing a practical and feasible transmission solution for the engineering application of electric hydraulic supports.

[0036] This embodiment also provides a power unit, which includes a lockable first motor (not shown), a lockable second motor (not shown), and the multi-functional transmission reducer for coal mine hydraulic supports described in the above embodiment. Both the lockable first motor and the lockable second motor are mounted on the input bearing housing 120 and located on the same side of the input bearing housing 120. The lockable first motor is connected to the heavy-duty input shaft 200, and the lockable second motor is connected to the light-duty input shaft 400. The power unit has advantages such as flexible use, wide application range, and low maintenance costs.

[0037] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A multi-functional transmission reducer for hydraulic supports in coal mines, characterized in that, include: The housing (100) and the heavy-duty input shaft (200), the first transmission mechanism (300), the light-duty input shaft (400) and the second transmission mechanism (500) are all mounted on the housing (100). The heavy-duty input shaft (200) is rotatably engaged with the housing (100), and the heavy-duty input shaft (200) is used to connect to a lockable first motor; the second transmission mechanism (500) includes a first gear ring (510), a first planetary carrier (520) and a first planetary gear (530), the first gear ring (510) is rotatably connected to the first planetary carrier (520), the first planetary carrier (520) is rotatably connected to the housing (100), the first planetary gear (530) is rotatably mounted on the first planetary carrier (520), and the light-duty input shaft (400) is rotatably connected to the first planetary carrier (520) and meshes with the first planetary gear (530); The heavy-duty input shaft (200) is connected to the input part of the first transmission mechanism (300), the output part of the first transmission mechanism (300) meshes with the outer tooth of the first gear ring (510), and the first planetary gear (530) meshes with the inner tooth of the first gear ring (510); the light-duty input shaft (400) is used to connect to a lockable second motor.

2. The multi-functional transmission reducer for coal mine hydraulic supports according to claim 1, characterized in that: The housing (100) includes a box (110) and an input bearing seat (120), the top of the box (110) is configured as an opening, and the input bearing seat (120) is connected to the box (110) and closes the opening; The two ends of the heavy-duty input shaft (200) are rotatably connected to the housing (110) and the input bearing seat (120), respectively; the two ends of the first planetary carrier (520) are rotatably connected to the housing (110) and the input bearing seat (120), respectively.

3. The multi-functional transmission reducer for coal mine hydraulic supports according to claim 1, characterized in that: The first transmission mechanism (300) includes a parallel gear transmission mechanism, the heavy-duty input shaft (200) is connected to the input part of the parallel gear transmission mechanism, and the output part of the parallel gear transmission mechanism meshes with the external gear part.

4. The multi-functional transmission reducer for coal mine hydraulic supports according to claim 3, characterized in that: The parallel gear transmission mechanism includes a transmission gear shaft (310) and a transmission gear (320). The transmission gear shaft (310) is rotatably mounted inside the housing (100). The transmission gear (320) is sleeved and fixed outside the transmission gear shaft (310). The transmission gear (320) and the transmission teeth on the transmission gear shaft (310) are arranged in the axial direction of the transmission gear shaft (310). The heavy-duty input shaft (200) meshes with the transmission gear (320), and the transmission teeth mesh with the external teeth.

5. The multi-functional transmission reducer for coal mine hydraulic supports according to claim 1, characterized in that: The first planetary carrier (520) has an internal mounting hole, and the light-load input shaft (400) is inserted into the mounting hole. The light-load input shaft (400) is rotatably connected to the wall of the mounting hole through a bearing.

6. The multi-functional transmission reducer for coal mine hydraulic supports according to claim 1, characterized in that: The second transmission mechanism (500) further includes a first support base (540) and a second support base (550). The first support base (540), the first gear ring (510) and the second support base (550) are rotatably sleeved on the outside of the first planetary carrier (520) and arranged sequentially in the axial direction of the light-load input shaft (400). The first gear ring (510) is fixedly connected to both the first support base (540) and the second support base (550).

7. The multi-functional transmission reducer for coal mine hydraulic supports according to claim 1, characterized in that: The second transmission mechanism (500) further includes a second sun gear (560), a second ring gear (570), a second planet carrier (580), and a second planet gear (590). One end of the second sun gear (560) is connected to the first planet carrier (520), and the other end is connected to the second planet carrier (580). The second planet carrier (580) is rotatably connected to the outer casing (100). The second planet gear (590) is rotatably mounted on the second planet carrier (580), and the second ring gear (570) is fixedly connected to the outer casing (100). The second sun gear (560) meshes with the second planet gear (590), and the second planet gear (590) meshes with the second gear ring (570).

8. The multi-functional transmission reducer for coal mine hydraulic supports according to claim 7, characterized in that: The bottom of the housing (100) is provided as an opening, the second gear ring (570) is fixed to the bottom of the housing (100), one end of the second planetary carrier (580) extends into the housing (100) from the opening and is rotatably connected to the housing (100), and the other end of the second planetary carrier (580) extends out of the second gear ring (570) and is rotatably connected to the second gear ring (570).

9. The multi-functional transmission reducer for coal mine hydraulic supports according to claim 8, characterized in that: An oil seal assembly (600) is provided between the second planetary carrier (580) and the second gear ring (570).

10. A power unit, characterized in that, The power unit includes: The lockable first motor, the lockable second motor, and the multi-functional transmission reducer for coal mine hydraulic supports according to any one of claims 1-9, wherein the lockable first motor and the lockable second motor are both mounted on the housing (100) and located on the same side of the housing (100), the lockable first motor is connected to the heavy-duty input shaft (200), and the lockable second motor is connected to the light-duty input shaft (400).

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