Helical gear speed reducer overload protection device

Abstract

The utility model provides a helical gear speed reducer overload protection device which comprises a speed reduction shell, an assembly boss is arranged at one end of the speed reduction shell, a driving motor is arranged at the other end of the speed reduction shell, and a driving wheel is arranged on an output shaft of the driving motor. And the detection unit comprises a temperature sensor, a fixed disc and a heat preservation cover arranged on the fixed disc. According to the overload protection device of the helical gear speed reducer, the temperature in the speed reduction shell rises sharply under high-load operation, at the moment, the heat conduction disc is pushed to be close to the driving wheel under the action of the spring, heat is transferred to the heat transfer piece through the heat conduction disc, and the heat transfer piece enables the temperature in the heat preservation cover to rise gradually along with continuous operation of the driving wheel; the detection rod is used for detecting the temperature in real time, and when the temperature exceeds a limited range, the temperature sensor sends an electric signal to the driving motor to reduce or stop the output power, so that parts in the speed reduction shell are protected.

Description

Technical Field

[0001] This utility model relates to the field of speed reducer technology, and more specifically to an overload protection device for a helical gear speed reducer. Background Technology

[0002] A speed reducer primarily reduces the motor's speed through a speed reduction transmission device, thereby increasing the output torque of the output shaft and improving the accuracy and stability of mechanical transmission at lower speeds.

[0003] Helical gear reducers contain multiple stages of meshing helical gears. During transmission, the number of teeth on the driving gear is less than the number of teeth on the driven gear, so as to reduce speed during meshing transmission.

[0004] However, during the operation of a helical gear reducer, in order to improve working efficiency, the reducer will maintain a high transmission speed. Since the speed of the driving gear is usually higher than that of the driven gear, the temperature at the driving gear will rise sharply. Over time, the driving gear will overheat, leading to increased gear wear or even deformation, which will affect the transmission accuracy and efficiency of the gear. Utility Model Content

[0005] The purpose of this invention is to solve the aforementioned problems in the existing technology.

[0006] To achieve the above objectives, this utility model can be implemented through the following technical solution: an overload protection device for a helical gear reducer, comprising:

[0007] A reduction gear housing, one end of which is provided with a mounting boss, and the other end of which is provided with a drive motor, and the output shaft of the drive motor is provided with a drive wheel;

[0008] The detection unit is disposed on the assembly boss and includes a temperature sensor, a fixed plate and a heat insulation cover disposed on the fixed plate. The temperature sensor is disposed on one side of the fixed plate and a detection rod located inside the heat insulation cover is disposed at its axis.

[0009] A heat transfer element is slidably mounted on the fixed disk, a spring is provided between the heat transfer element and the fixed disk, a heat conduction disk is provided at the end of the heat transfer element, and the spring pushes against the heat transfer element so that the heat conduction disk is close to the drive wheel.

[0010] In this embodiment of the utility model, the heat-conducting disk is provided with rolling balls arranged in a circumferential array, and the rolling balls are in contact with the drive wheel.

[0011] In this embodiment of the utility model, the heat transfer component includes a top plate, a bottom plate, and a connecting rod disposed between the top plate and the bottom plate. The bottom plate cooperates with the spring, and the top plate cooperates with the heat conduction plate.

[0012] A bracket is provided on the connecting rod, and a heat-conducting ring that contacts the heat-conducting plate is snapped onto the bracket. The detection rod is located at the axis of the heat-conducting ring.

[0013] In this embodiment of the invention, the detection rod has a detection end, which is located at the center of the distance between the top plate and the bottom plate.

[0014] In this embodiment of the utility model, the fixed plate has an installation groove, and the heat insulation cover is assembled in the installation groove.

[0015] In this embodiment of the utility model, the heat insulation cover is provided with a ventilation groove.

[0016] In this embodiment of the utility model, a groove is provided on the fixing plate, and the spring is located in the groove.

[0017] In this embodiment of the utility model, a spacer ring is provided on the fixed disk, a protrusion that cooperates with the temperature sensor is provided on one side of the spacer ring, and a frustum is provided on the other side.

[0018] In this embodiment of the invention, the temperature sensor is provided with a transmission line.

[0019] In this embodiment of the utility model, the fixing plate is provided with a buckle, the buckle is provided with a slot that engages with the mounting boss, and the slot is provided with an inclined surface.

[0020] Compared with the prior art, the advantages of this application are as follows: When the reducer is running, the drive motor controls the rotation of the drive wheel. Due to the rapid increase in temperature inside the reducer housing under high load operation, the heat-conducting plate is pushed close to the drive wheel by the spring. The heat is transferred to the heat transfer component through the heat-conducting plate. As the drive wheel continues to run, the temperature inside the heat-insulating cover gradually increases. The detection rod detects the temperature in real time. When the temperature exceeds the limit range, the temperature sensor sends an electrical signal to the drive motor to reduce or stop the output power, thereby protecting the components inside the reducer housing. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure;

[0022] Figure 2 This is a schematic diagram of the overall assembly structure of the detection unit;

[0023] Figure 3 This is a schematic diagram of the exploded disassembly of the internal parts of the insulation cover in the detection unit.

[0024] Figure 4 This is a half-section plan view of some parts of the detection unit;

[0025] Figure 5 It is a partial cross-sectional planar schematic diagram of the overall internal structure.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Drive motor; 2. Reduction housing; 21. Mounting boss; 22. First-stage transmission; 23. Second-stage transmission; 3. Detection unit; 31. Temperature sensor; 310. Transmission line; 311. Detection rod; 32. Fixing plate; 321. Spacer ring; 322. Protrusion; 323. Frustum; 324. Mounting slot; 325. Groove; 33. Buckle; 331. Slot; 332. Triangular block; 333. Inclined surface; 34. Insulation cover; 341. Ventilation groove; 35. Heat-conducting plate; 351. Rolling ball; 36. Heat transfer component; 361. Top plate; 362. Connecting rod; 363. Bracket; 364. Base; 365. Heat-conducting ring; 37. Spring. Detailed Implementation

[0028] The following are specific embodiments of the present invention, and the technical solution of the present invention will be further described in conjunction with the accompanying drawings.

[0029] like Figure 1-5 As shown, an overload protection device for a helical gear reducer includes:

[0030] The reduction housing 2 has a mounting boss 21 at one end and a drive motor 1 at the other end. The output shaft of the drive motor 1 is equipped with a drive wheel.

[0031] The detection unit 3 is mounted on the mounting boss 21 and includes a temperature sensor 31, a fixed plate 32 and a heat insulation cover 34 mounted on the fixed plate 32. The temperature sensor 31 is located on one side of the fixed plate 32 and a detection rod 311 located inside the heat insulation cover 34 is located at its axis.

[0032] A heat transfer element 36 is slidably mounted on the fixed disk 32. A spring 37 is provided between the heat transfer element 36 and the fixed disk 32. A heat conduction disk 35 is provided at the end of the heat transfer element 36. The spring 37 pushes against the heat transfer element 36 so that the heat conduction disk 35 is close to the drive wheel.

[0033] Specifically, the reduction housing 2 is equipped with a first-stage transmission 22 and a second-stage transmission 23 to improve the stability of the transmission through multi-stage reduction. Both the first-stage transmission 22 and the second-stage transmission 23 are equipped with a driving wheel and a driven wheel, and the number of teeth on the driving wheel is less than the number of teeth on the driven wheel. The driving wheel of the first-stage transmission 22 is engaged with the output end of the drive motor 1. Therefore, when the drive motor 1 is running, the driving wheel of the first-stage transmission 22 heats up faster than other components.

[0034] Furthermore, the drive motor 1 operates to drive the first-stage transmission 22 and the second-stage transmission 23 to run synchronously. Under high-speed load operation for a long time, the temperature at the drive wheel rises sharply. The spring 37 pushes the heat conduction plate 35 to contact the drive wheel, transferring heat to the heat transfer element 36. As a result, the temperature inside the insulation cover 34 continues to rise. At the same time, the detection rod 311 located at the axis of the insulation cover 34 detects the temperature change in real time. When the temperature exceeds the limit range, the temperature sensor 31 sends an electrical signal to the drive motor 1 to reduce or stop the temperature of the drive motor 1.

[0035] As a further embodiment of this utility model, the heat-conducting disk 35 is provided with a circumferential array of rolling balls 351. The rolling balls 351 are in contact with the drive wheel. The aforementioned circumferential array means that, with the axis of the heat-conducting disk 35 as a reference, a number of rolling balls 351 are evenly distributed along the axis. Under the push of the spring 37, the rolling balls 351 are driven to contact the drive wheel. This serves two purposes: firstly, it allows the heat-conducting disk 35 to get closer to the drive wheel, and secondly, it does not hinder the rotation of the drive wheel.

[0036] As a further embodiment of this utility model, the heat transfer element 36 includes a top plate 361, a bottom plate 364, and a connecting rod 362 disposed between the top plate 361 and the bottom plate 364. The bottom plate 364 cooperates with the spring 37, while the top plate 361 cooperates with the heat-conducting plate 35. A bracket 363 is provided on the connecting rod 362, and a heat-conducting ring 365 that contacts the heat-conducting plate 35 is snapped onto the bracket 363. The detection rod 311 is located at the axis of the heat-conducting ring 365. The heat-conducting plate 35 transfers the heat emitted by the drive wheel to the heat-conducting ring 365. The heat is better output to the heat insulation cover 34 through the heat-conducting ring 365, so that the temperature measurement by the detection rod 311 is more accurate. The heat insulation cover 34 has a certain heat preservation effect, and the heat insulation cover 34 is connected to the fixed plate and the bottom plate 364 to form a temperature detection chamber. The detection rod 311 is located in the temperature detection chamber, thereby reducing the influence of other factors of the deceleration housing 2 on the detection rod 311.

[0037] As a further embodiment of this utility model, the detection rod 311 has a detection end located at the center of the distance between the top plate 361 and the bottom plate 364. The detection end is equipped with a thermistor, which detects the temperature change inside the heat insulation cover 34.

[0038] As a further embodiment of this utility model, the fixed plate 32 is provided with a mounting groove 324, and the heat insulation cover 34 is assembled in the mounting groove 324. The heat insulation cover 34 has a step, and a plurality of mounting holes are provided on the step. The heat insulation cover 34 is fixed in the mounting groove 324 by bolts cooperating with the mounting holes. The step improves the connection stability between the fixed plate 32 and the heat insulation cover 34.

[0039] As a further embodiment of this utility model, the heat insulation cover 34 is provided with a ventilation groove 341. When the drive motor 1 stops running, the temperature inside the heat insulation cover 34 will flow out through the ventilation groove 341, thereby gradually reducing the temperature of the heat insulation cover 34.

[0040] As a further embodiment of this utility model, a groove 325 is provided on the fixed plate 32, and the spring 37 is located in the groove 325. The groove 325 serves as a limiting position, thereby restricting the spring 37 from shaking, and also facilitating the assembly of the spring 37.

[0041] As a further embodiment of this utility model, a spacer ring 321 is provided on the fixed disk 32. A protrusion 322 that cooperates with the temperature sensor 31 is provided on one side of the spacer ring 321, and a frustum 323 is provided on the other side. The spacer ring 321 keeps a certain distance between the temperature sensor 31 and the fixed disk 32, and the temperature sensor 31 is fixed to the protrusion 322 by bolts. The frustum 323 is snapped onto the fixed disk 32, thereby improving the connection effect between the spacer ring and the fixed disk 32.

[0042] As a further embodiment of this utility model, the temperature sensor 31 is provided with a transmission line 310, and the output line is connected to an external control device. When the internal temperature of the deceleration housing 2 is too high, the speed of the drive motor 1 is adjusted or the operation of the drive motor 1 is stopped directly through the control device.

[0043] As a further embodiment of this utility model, the fixed plate 32 is provided with a buckle 33, the buckle 33 is provided with a groove 331 that engages with the mounting boss 21, the groove 331 is provided with an inclined surface 333, and the buckle 33 is provided with a triangular block 332 so that the groove 331 can be separated from the mounting boss 21 by contacting the triangular block 332 with the hand. Pressing the fixed plate 32 can directly connect the buckle 33 and the mounting boss 21 so that the fixed plate 32 is fixed to the reduction housing 2.

[0044] Installation procedure for detection unit 3: First, install spring 37 to one end of fixed plate 32, and connect the other end of spring 37 to base plate 364. Install connecting rod 362, bracket 363, heat-conducting ring 365 and top plate 361 in sequence. Then, place insulation cover 34 into mounting groove 324 and fix it with bolts. Next, install spacer ring 321 and temperature sensor 31 in sequence on the other end of fixed plate 32, so that the detection rod 311 of temperature sensor 31 is located inside insulation cover 34. Then, align fixed plate 32 with mounting boss 21 and press it down. The buckle 33 is engaged with the mounting boss 21 to complete the assembly of the detection unit 3. When the drive motor 1 is running, the ball 351 on the heat conduction plate 35 is pushed by the spring 37 to contact the drive wheel, so that the temperature of the drive wheel gradually increases. During this process, the heat conduction plate 35 conducts heat to the heat insulation cover 34, so that the temperature inside the heat insulation cover 34 rises synchronously. The real-time temperature inside the heat insulation cover 34 is measured by the detection rod 311 and the temperature value is transmitted to the temperature sensor 31 for display, thereby reducing the phenomenon of overheating of the reduction housing 2.

[0045] The above-described technical solution of this utility model addresses the problem that existing technical solutions are too simplistic and provides a solution that is significantly different from existing technologies. The parts not covered in this application's technical solution are the same as or can be implemented using existing technologies, and will not be described in detail here.

[0046] The technical solutions in the above embodiments have clearly and completely described the content of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

Claims

1. An overload protection device for a helical gear reducer, characterized in that, include: A reduction gear housing, one end of which is provided with a mounting boss, and the other end of which is provided with a drive motor, and the output shaft of the drive motor is provided with a drive wheel; The detection unit is disposed on the assembly boss and includes a temperature sensor, a fixed plate and a heat insulation cover disposed on the fixed plate. The temperature sensor is disposed on one side of the fixed plate and a detection rod located inside the heat insulation cover is disposed at its axis. A heat transfer element is slidably mounted on the fixed disk, a spring is provided between the heat transfer element and the fixed disk, a heat conduction disk is provided at the end of the heat transfer element, and the spring pushes against the heat transfer element so that the heat conduction disk is close to the drive wheel.

2. The overload protection device for a helical gear reducer according to claim 1, characterized in that, The heat-conducting plate is arranged in a circumferential array of rolling balls, which are in contact with the drive wheel.

3. The overload protection device for a helical gear reducer according to claim 1, characterized in that, The heat transfer component includes a top plate, a bottom plate, and a connecting rod disposed between the top plate and the bottom plate. The bottom plate cooperates with the spring, and the top plate cooperates with the heat-conducting plate. A bracket is provided on the connecting rod, and a heat-conducting ring that contacts the heat-conducting plate is snapped onto the bracket. The detection rod is located at the axis of the heat-conducting ring.

4. The overload protection device for a helical gear reducer according to claim 3, characterized in that, The detection rod has a detection end, which is located at the center of the distance between the top plate and the bottom plate.

5. The overload protection device for a helical gear reducer according to claim 1, characterized in that, The fixed plate has an installation groove, and the heat insulation cover is assembled in the installation groove.

6. The overload protection device for a helical gear reducer according to claim 5, characterized in that, The heat insulation cover has ventilation slots.

7. The overload protection device for a helical gear reducer according to claim 1, characterized in that, The fixed plate has a groove, and the spring is located in the groove.

8. The overload protection device for a helical gear reducer according to claim 1, characterized in that, The fixed plate is provided with a spacer ring, one side of which is provided with a protrusion that cooperates with the temperature sensor, and the other side is provided with a frustum.

9. An overload protection device for a helical gear reducer according to claim 8, characterized in that, The temperature sensor is equipped with a transmission line.

10. An overload protection device for a helical gear reducer according to claim 1, characterized in that, The fixed plate is provided with a buckle, the buckle is provided with a slot that engages with the mounting boss, and the slot is provided with an inclined surface.

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