Torque structure for motor overload protection

Abstract

The utility model discloses a torque structure for motor overload protection, including the casing, the left and right two sides inner wall of casing rotation is connected with input shaft, transfer shaft and output shaft, input shaft, transfer shaft and output shaft set from top to bottom, install first gear on input shaft, the outside of transfer shaft is provided with rotation pipe, is established with guide groove on the lateral wall of transfer shaft, the outside fixed connection of rotation pipe has second gear, the inside fixed connection of rotation pipe has guide strip, output shaft fixed connection has third gear, first gear and second gear engage, second gear and third gear engage, protection mechanism. This torque mechanism when using, not only can make motor output end to separate from load when motor overload, can also carry out the spacing to load end, avoids the situation that load end continues to move or appears other dangerous problem under the inertia.

Description

Technical Field

[0001] This utility model relates to the field of motor protection technology, and in particular to a torque structure for motor overload protection. Background Technology

[0002] In motor drive systems, motor overload is a common and pressing problem. When the motor load exceeds its rated capacity, excessive current will generate too much heat in the motor windings. If not handled in time, this will accelerate the aging of the motor insulation materials, shorten the motor's service life, cause shaft breakage, or even lead to serious malfunctions such as motor burnout, resulting in production interruption and equipment damage, causing significant economic losses.

[0003] Currently, common motor overload protection methods, such as the utility model patent with publication number CN216812581U, all utilize the operation of disconnecting the connector for protection. However, with this method, the load end will continue to move due to inertia. The large amplitude of inertial movement may lead to collisions, damage to other components, or even endanger personnel safety. Therefore, how to solve the above problems needs to be considered. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a torque structure for motor overload protection. When in use, this torque mechanism can not only disconnect the motor output from the load when the motor is overloaded, but also limit the load end to prevent the load end from continuing to move due to inertia or causing other dangerous problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A torque structure for motor overload protection includes a housing. An input shaft, a rotating shaft, and an output shaft are rotatably connected between the inner walls of the left and right sides of the housing, arranged from top to bottom. A first gear is mounted on the input shaft. A rotating tube is provided on the outer side of the rotating shaft. A guide groove is formed on the side wall of the rotating shaft. A second gear is fixedly connected to the outer side of the rotating tube. A guide strip is fixedly connected to the inner side of the rotating tube. A third gear is fixedly connected to the output shaft. The first gear meshes with the second gear, and the second gear meshes with the third gear. A protection mechanism is also included to provide protection during overload.

[0007] Preferably, the right end of the input shaft extends to the outside, and the left ends of the input shaft, the intermediate shaft, and the output shaft all extend to the outside.

[0008] Preferably, an indicator strip is fixedly connected to the left sidewall of the input shaft, intermediate shaft, and output shaft.

[0009] Preferably, the protection mechanism includes an L-shaped connecting plate fixedly connected to the right side of the housing, and a hydraulic telescopic rod is installed on the right side of the vertical part of the L-shaped connecting plate. The hydraulic telescopic rod extends into the interior of the housing and is fixedly connected to a connecting vertical plate.

[0010] Preferably, the rotating tube passes through the connecting vertical plate and is rotatably connected to the connecting vertical plate via a bearing.

[0011] Preferably, a second friction disc is fixedly connected to the lower end of the connecting vertical plate, and a second friction disc is fixedly connected to the output shaft to cooperate with the first friction disc.

[0012] Compared with the prior art, the advantages of this utility model are as follows:

[0013] 1. The current sensor detects the motor current to reflect the load condition. When overloaded, the controller controls the hydraulic system to disengage the gears, preventing shaft breakage or motor damage and extending the service life of the equipment.

[0014] 2. When overloaded, the connecting vertical plate moves to make the second friction disc contact the first friction disc and apply pressure, generating high friction force to brake the output shaft, preventing the output end from moving significantly due to inertia, and reducing adverse effects and potential dangers.

[0015] 3. After the overload is released, the reset operation is relatively simple, which facilitates the actual operation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a torque structure for motor overload protection proposed in this utility model;

[0017] Figure 2 for Figure 1 Cross-sectional view;

[0018] Figure 3 for Figure 2 Enlarged view of point A;

[0019] Figure 4 for Figure 2 The left-side view.

[0020] In the diagram: 1. Housing, 2. L-shaped connecting plate, 3. Hydraulic telescopic rod, 4. Input shaft, 5. Output shaft, 6. Rotary shaft, 7. First gear, 8. Second gear, 9. Third gear, 10. First friction disc, 11. Second friction disc, 12. Connecting vertical plate, 13. Rotating tube, 14. Guide bar, 15. Guide groove, 16. Indicator bar. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] Reference Figures 1-4 A torque structure for motor overload protection includes a housing 1. An input shaft 4, a rotating shaft 6, and an output shaft 5 are rotatably connected between the inner walls of the left and right sides of the housing 1. The input shaft 4, the rotating shaft 6, and the output shaft 5 are arranged from top to bottom. A first gear 7 is mounted on the input shaft 4. A rotating tube 13 is provided on the outer side of the rotating shaft 6. A guide groove 15 is provided on the side wall of the rotating shaft 6. A second gear 8 is fixedly connected to the outer side of the rotating tube 13. A guide strip 14 is fixedly connected to the inner side of the rotating tube 13. A third gear 9 is fixedly connected to the output shaft 5. The first gear 7 meshes with the second gear 8, and the second gear 8 meshes with the third gear 9.

[0023] The right end of the input shaft 4 extends to the outside and connects to the output end of an external motor. Note that a current sensor (not shown) and a controller are also included. The current sensor is electrically connected to the motor to detect the motor's current signal, which reflects the load condition. When the signal threshold exceeds a set value, the controller can control the hydraulic telescopic rod 3 to retract. It should be noted that the hydraulic telescopic rod 3 can be reset independently later. Furthermore, a hydraulic circuit system is included to control the extension and retraction of the hydraulic telescopic rod 3. The left ends of the input shaft 4, intermediate shaft 6, and output shaft 5 all extend to the outside. Indicator bars 16 are fixedly connected to the left sidewalls of the input shaft 4, intermediate shaft 6, and output shaft 5. When multiple indicator bars 6 are in... Figure 4 When the state is in the indicated state, it means that the first gear 7, the second gear 8 and the third gear 9 are in the meshing state, which makes it convenient for subsequent staff to reset the structure.

[0024] It also includes a protection mechanism for overload protection. The protection mechanism includes an L-shaped connecting plate 2 fixedly connected to the right side of the housing 1. A hydraulic telescopic rod 3 is installed on the right side of the vertical part of the L-shaped connecting plate 2. The hydraulic telescopic rod 3 extends into the interior of the housing 1 and is fixedly connected to a connecting vertical plate 12. A rotating tube 13 passes through the connecting vertical plate 12 and is rotatably connected to the connecting vertical plate 12 through a bearing.

[0025] The lower end of the connecting vertical plate 12 is fixedly connected to the second friction disc 11, the left end of the output shaft 5 is fixedly connected to the external load end, and the second friction disc 11 is fixedly connected to the output shaft 5 to cooperate with the first friction disc 10. The first friction disc 10 and the second friction disc 11 are respectively made of materials similar to car brake discs and brake pads. When the two come into contact and a certain pressure is applied, a high friction force can be achieved, thereby braking the output shaft 5.

[0026] In this invention, the output end of the external motor is connected to the right end of the input shaft 4. After the motor starts, it drives the input shaft 4 to rotate. A first gear 7 is installed on the input shaft 4, and the first gear 7 rotates synchronously with the input shaft 4. Since the first gear 7 meshes with the second gear 8, and the second gear 8 is fixed on the outside of the rotating tube 13, the guide strip 14 on the inner side of the rotating tube 13 cooperates with the guide groove 15 on the side wall of the central shaft 6, so that the rotating tube 13 can rotate on the central shaft 6 and the relative positions of the two are fixed. Therefore, the rotation of the first gear 7 drives the second gear 8 and the rotating tube 13 to rotate. Since the second gear 8 meshes with the third gear 9, and the third gear 9 is fixed on the output shaft 5, the rotation of the rotating tube 13 drives the third gear 9 and the output shaft 5 to rotate. The left end of the output shaft 5 is connected to the external load end, thereby realizing the normal transmission of power from the motor to the load end.

[0027] A current sensor is electrically connected to the motor to continuously monitor the motor's current signal. Since the motor's current signal reflects the load condition, when the load is too high and the motor is overloaded, the threshold current signal detected by the current sensor will exceed a set value. When the current sensor detects a current signal threshold exceeding the set value, it transmits the signal to the controller. The controller then controls the hydraulic circuit system to retract the hydraulic telescopic rod 3. The hydraulic telescopic rod 3 is fixed to the right side of the vertical part of the L-shaped connecting plate 2. Its retraction causes the fixedly connected vertical plate 12 to move to the right, thereby causing the rotating tube 13 to drive the second gear 8 to move to the right, preventing it from contacting the first gear 7 and the third gear 9, thus ceasing transmission and avoiding shaft breakage or motor damage due to excessive load. The rightward movement of the connecting vertical plate 12 also causes the second friction disc 11 to contact the first friction disc 10 and apply a certain pressure. Since the first friction disc 10 and the second friction disc 11 are made of materials similar to automotive brake discs and brake pads, they generate high friction after contact and pressure, thereby braking the output shaft 5 and preventing adverse effects caused by the output end continuing to move significantly due to inertia.

[0028] Once the overload is relieved, the hydraulic telescopic rod 3 can be individually activated via the controller to reset a certain distance. The extension of the hydraulic telescopic rod 3 causes the connecting vertical plate 12 to move to the left, separating the second friction disc 11 from the first friction disc 10, releasing the brake on the output shaft 5, and then allowing all the indicator bars 16 to be in position. Figure 4 When the state is reached, it means that the first gear 7, the second gear 8, and the third gear 9 have returned to the meshing state. At this time, the hydraulic telescopic rod 3 is fully reset so that the second gear 8 returns to its original position, and the reset is completed, and normal transmission work can resume.

[0029] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A torque structure for motor overload protection, characterized in that, include: The housing (1) has an input shaft (4), a transfer shaft (6) and an output shaft (5) rotatably connected between the inner walls of its left and right sides. The input shaft (4), transfer shaft (6) and output shaft (5) are arranged from top to bottom. A first gear (7) is installed on the input shaft (4). A rotating tube (13) is provided on the outer side of the transfer shaft (6). A guide groove (15) is opened on the side wall of the transfer shaft (6). A second gear (8) is fixedly connected to the outer side of the rotating tube (13). A guide strip (14) is fixedly connected to the inner side of the rotating tube (13). A third gear (9) is fixedly connected to the output shaft (5). The first gear (7) meshes with the second gear (8), and the second gear (8) meshes with the third gear (9). A protection mechanism for providing protection in the event of an overload.

2. The torque structure for motor overload protection according to claim 1, characterized in that, The right end of the input shaft (4) extends to the outside, and the left ends of the input shaft (4), the intermediate shaft (6) and the output shaft (5) all extend to the outside.

3. The torque structure for motor overload protection according to claim 2, characterized in that, Indicator strips (16) are fixedly connected to the left sidewalls of the input shaft (4), the transfer shaft (6) and the output shaft (5).

4. The torque structure for motor overload protection according to claim 1, characterized in that, The protective mechanism includes an L-shaped connecting plate (2) fixedly connected to the right side of the housing (1). A hydraulic telescopic rod (3) is installed on the right side of the vertical part of the L-shaped connecting plate (2). The hydraulic telescopic rod (3) extends into the interior of the housing (1) and is fixedly connected to a connecting vertical plate (12).

5. A torque structure for motor overload protection according to claim 4, characterized in that, The rotating tube (13) passes through the connecting vertical plate (12) and is rotatably connected to the connecting vertical plate (12) via a bearing.

6. The torque structure for motor overload protection according to claim 5, characterized in that, The lower end of the connecting vertical plate (12) is fixedly connected to a second friction disc (11), and the output shaft (5) is fixedly connected to a second friction disc (11) to cooperate with the first friction disc (10).

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