Overload protection type transmission separation structure of mining conveyor speed reducer

Abstract

The overload protection type transmission separation structure comprises an output shaft, a transmission assembly, an output shaft gear and a power cut-off assembly, the transmission assembly is rotatably arranged on the output shaft, the output shaft gear is connected to the transmission assembly in a sleeving mode, the power cut-off assembly is arranged between the power transmission assembly and the output shaft, and the output shaft gear is connected to the output shaft gear in a sleeving mode. Wherein the power cut-off assembly comprises an inner connecting disc, an outer connecting disc, a fixing assembly, a first adjusting pad set, a second adjusting pad set and a protection pin, the inner connecting disc is in spline connection with the transmission assembly, the outer connecting disc is fixed to the output shaft through the fixing assembly, and the first adjusting pad set is arranged on the axial side of the inner connecting disc; the second adjusting pad set is arranged on one axial side of the outer connecting disc, and the protection pin is arranged on the inner connecting disc and the outer connecting disc. The transmission device is compact in overall structure and high in reliability, transmission connection between the output shaft and the output gear can be directly cut off during overload, the integrity of a core transmission part is effectively protected, and the service life of the part is effectively prolonged.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of speed reducer, and particularly relates to an overload protection type transmission separation structure of a mine conveyor speed reducer. BACKGROUND

[0002] The mine conveyor speed reducer is a core transmission component of an underground transportation system in a coal mine or the like, and is long-term operated in a harsh working condition of high load and multiple impacts. Overload failure can easily cause serious damage such as gear tooth impact and shaft deformation in the speed reducer, which not only has high maintenance cost, but also causes production stagnation.

[0003] The technical scheme of the existing overload protection speed reducer mainly has the following deficiencies: The electronic component dependent scheme cuts off power transmission through an overload protector and other electronic components, but the electronic components are prone to failure in the humid and dusty environment underground, and the protection reliability is poor. The driving end separation scheme realizes the separation of the motor and the driving shaft through the centrifugal force of a locking pin, but this scheme can only cut off the power input end, and cannot avoid the impact of the overload torque transmitted in the speed reducer on the gear and shaft system, and the internal transmission components can still be damaged. The complex structure scheme uses friction plates, expansion sleeves and other components in some mechanical overload protection structures, which have the problems of large size, difficult maintenance and unsuitability for narrow space underground in mines. SUMMARY

[0004] In order to at least partially solve the technical problems existing in the prior art, the present application provides an overload protection type transmission separation structure of a mine conveyor speed reducer.

[0005] The overload protection type transmission separation structure of the mine conveyor speed reducer of the present application comprises an output shaft, a transmission assembly, an output shaft gear and a power cut-off assembly. The transmission assembly is rotatably arranged on the output shaft. The output shaft gear is sleeved on the transmission assembly for driving the transmission assembly to rotate through the output shaft gear. The power cut-off assembly is arranged between the power transmission assembly and the output shaft. The power transmission assembly is transmitted by the output shaft through the power cut-off assembly. The power cut-off assembly is used to cut off the transmission between the power transmission assembly and the output shaft when overloaded, wherein: The power cut-off assembly comprises an inner coupling disc, an outer coupling disc, a fixing assembly, a first adjusting pad set, a second adjusting pad set and a protection pin. The inner coupling disc is connected with the transmission assembly by splines. The outer coupling disc is fixed on the output shaft by the fixing assembly. The first adjusting pad set is arranged on one side of the inner coupling disc in the axial direction. The second adjusting pad set is arranged on one side of the outer coupling disc in the axial direction, and is used to adjust the axial gap between the inner coupling disc and the outer coupling disc. The protection pin is arranged on the inner coupling disc and the outer coupling disc, and is used for transmission between the inner coupling disc and the outer coupling disc.

[0006] Further, in the overload protection type transmission separation structure of the mine conveyor reducer, the transmission assembly comprises a hollow shaft, a needle bearing, a spacer sleeve and an O-shaped sealing ring, the outer side of the needle bearing is in transition fit with the inner wall of the hollow shaft, the inner side of the needle bearing is in circumferential fit with the output shaft, the spacer sleeve is arranged at the front end of the needle bearing between the output shaft and the hollow shaft, and is used for positioning the needle bearing, and the O-shaped sealing ring is arranged between the output shaft and the hollow shaft, and is used for sealing between the output shaft and the hollow shaft.

[0007] Further, in the overload protection type transmission separation structure of the mine conveyor reducer, the front end of the hollow shaft is provided with an inner spline, and the outer circumferential direction of the rear end of the hollow shaft is provided with a first key groove.

[0008] Further, in the overload protection type transmission separation structure of the mine conveyor reducer, the inner coupling disc is arranged in a flange disc structure, the diameter of the middle flange hole of the inner coupling disc matches the diameter of the front end of the hollow shaft, the outer spline matched with the inner spline is arranged on the inner wall of the middle flange hole of the inner coupling disc, and the inner coupling disc and the hollow shaft are connected through the cooperation of the inner spline and the outer spline.

[0009] Further, in the overload protection type transmission separation structure of the mine conveyor reducer, the inner ring diameter of the output shaft gear matches the diameter of the rear end of the hollow shaft, the second key groove is arranged on the inner ring of the output shaft gear, the first key groove corresponds to the second key groove, and the first key groove and the second key groove are connected through a key.

[0010] Further, in the overload protection type transmission separation structure of the mine conveyor reducer, the outer coupling disc is arranged in a flange disc structure, the diameter of the middle flange hole of the outer coupling disc matches the diameter of the front end of the output shaft, and the middle flange hole of the outer coupling disc is connected with the spline of the output shaft for circumferential positioning of the outer coupling disc, and the bolt hole of the outer coupling disc is coaxial with the bolt hole of the inner coupling disc.

[0011] Further, in the overload protection type transmission separation structure of the mine conveyor reducer, the fixing assembly comprises a fixing disc and a fixing bolt, the diameter of the fixing disc is smaller than the diameter of the outer coupling disc and larger than the diameter of the output shaft, and the fixing bolt is in threaded engagement with the output shaft through the fixing disc for axial positioning of the outer coupling disc.

[0012] Further, in the overload protection type transmission separation structure of the mine conveyor reducer, the protection pin is arranged in the bolt hole of the inner coupling disc and the outer coupling disc, and the shear strength of the protection pin matches the design overload threshold of the reducer.

[0013] The overload protection transmission separation structure of the mine conveyor reducer of the present invention has the following advantages and beneficial effects: This invention offers strong protection: in case of overload, it directly disconnects the transmission connection between the output shaft and the output gear, preventing overload torque from impacting the internal gears and shafts of the reducer, effectively protecting the integrity of the core transmission components; it boasts high reliability: employing a purely mechanical structure, it does not rely on electronic components, making it suitable for harsh working conditions in mines, such as dampness, dust, and strong interference; it features a compact structure: integrated into the reducer output end, requiring no additional underground installation space, and maintenance only requires replacing the protective pin to restore its use, making operation convenient; and it ensures no damage to core components after overload: after separation, the output shaft gear can continue to rotate freely, preventing damage such as tooth breakage or deformation due to jamming, thus extending the service life of the components. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for further understanding of the embodiments of the present invention and constitute a part of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings: Figure 1 This is an axial sectional view of the overload protection transmission separation structure of the mine conveyor reducer of the present invention.

[0015] Explanation of reference numerals in the attached figures: 1: Output shaft; 2: Transmission components; 21: Hollow switch; 211: Internal spline; 212: First keyway; 22: Needle roller bearing; 23: Spacer sleeve; 24: O-ring seal; 3: Output shaft gear; 31: Second keyway; 4: Power-driven cutting-off assembly; 41: Internal connection disk; 411: External spline; 42: External connection disk; 43: Fixing component; 431: Fixing plate; 432: Fixing bolt; 44: First adjusting shim group; 45: Second adjusting shim group; 46: Protective pin. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0017] like Figure 1 As shown, the overload protection transmission separation structure of the mine conveyor reducer of the present invention includes an output shaft 1, a transmission assembly 2, an output shaft gear 3, and a power cut-off assembly 4. The transmission assembly 2 is rotatably mounted on the output shaft 1, and the output shaft gear 3 is sleeved on the transmission assembly 2 for driving the transmission assembly 2 to rotate. The power cut-off assembly 4 is disposed between the power transmission assembly 2 and the output shaft 1. The power transmission assembly 2 transmits power to the output shaft 1 through the power cut-off assembly 4. The power cut-off assembly 4 is used to cut off the transmission between the power transmission assembly 2 and the output shaft 1 in case of overload. The power cutting-off assembly 4 includes an inner connecting plate 41, an outer connecting plate 42, a fixing assembly 43, a first adjusting shim group 44, a second adjusting shim group 45, and a protective pin 46. The inner connecting plate 41 is splinedly connected to the transmission assembly 2. The outer connecting plate 42 is fixed to the output shaft 1 by the fixing assembly 43. The first adjusting shim group 44 is located on one axial side of the inner connecting plate 41, and the second adjusting shim group 45 is located on one axial side of the outer connecting plate 42. They are used to adjust the axial clearance between the inner connecting plate 41 and the outer connecting plate 42. The protective pin 46 is located on the inner connecting plate 41 and the outer connecting plate 42 and is used for transmission between the inner connecting plate 41 and the outer connecting plate 42. Thus, when the output shaft 1 is subjected to a torque exceeding the rated value during the transmission process between the inner connecting plate 41 and the outer connecting plate 42 through the protective pin 46, the protective pin 46 will shear and break.

[0018] Furthermore, in the overload protection transmission separation structure of the above-mentioned mine conveyor reducer, the transmission component 2 includes a hollow shaft 21, a needle roller bearing 22, an isolation sleeve 23, and an O-ring seal 24. The outer side of the needle roller bearing 22 is transitionally fitted with the inner wall of the hollow shaft 21, and the inner side of the needle roller bearing 22 is circumferentially fitted with the output shaft 1. The isolation sleeve 23 is set between the output shaft 1 and the front end of the needle roller bearing 22 for positioning the needle roller bearing 22. The O-ring seal 24 is set between the output shaft 1 and the hollow shaft 21 for sealing between the output shaft 1 and the hollow shaft 21, so that the hollow shaft 21 can rotate on the output shaft 1. The overall structure is compact.

[0019] Furthermore, in the overload protection transmission separation structure of the above-mentioned mine conveyor reducer, the front end of the hollow shaft 21 is provided with an internal spline 211, and the rear end of the hollow shaft 21 is provided with a first keyway 212 in the axial direction of the outer circumference.

[0020] Furthermore, in the overload protection transmission separation structure of the above-mentioned mine conveyor reducer, the inner connecting plate 41 is set in the form of a flange structure. The diameter of the flange hole in the middle of the inner connecting plate 41 matches the diameter of the front end of the hollow shaft 21. An outer spline 411 matching the inner spline 211 is provided on the inner wall of the flange hole in the middle of the inner connecting plate 41. The inner connecting plate 41 and the hollow shaft 21 are connected by the cooperation of the inner spline 211 and the outer spline 411, so that the rotation of the hollow shaft 21 provides rotational power to the inner connecting plate 41.

[0021] Furthermore, in the overload protection transmission separation structure of the above-mentioned mine conveyor reducer, the inner ring diameter of the output shaft gear 3 matches the rear end diameter of the hollow shaft 21. A second keyway 31 is provided on the inner ring of the output shaft gear 3. The first keyway 212 corresponds to the second keyway 31. The first keyway 212 and the second keyway 31 are connected by a key, thereby connecting the output shaft gear 3 and the hollow shaft 21. When the output shaft gear 3 rotates, it drives the hollow shaft 21 to rotate synchronously with the output shaft 1.

[0022] Furthermore, in the overload protection transmission separation structure of the above-mentioned mine conveyor reducer, the outer connecting plate 42 is set in the form of a flange structure. The diameter of the flange hole in the middle of the outer connecting plate 42 matches the diameter of the front end of the output shaft 1. The flange hole in the middle of the outer connecting plate 42 is splined to the output shaft 1 for circumferential positioning of the outer connecting plate 42. The bolt holes on the outer connecting plate 42 are coaxial with the bolt holes on the inner connecting plate 41. Thus, when the inner connecting plate 41 provides rotational power to the outer connecting plate 42 through the protective pin 46, the outer connecting plate 42 drives the output shaft 1 to rotate.

[0023] Furthermore, in the overload protection transmission separation structure of the above-mentioned mine conveyor reducer, the fixing component 43 includes a fixing plate 431 and a fixing bolt 432. The diameter of the fixing plate 431 is smaller than the diameter of the outer connecting plate 42 and larger than the diameter of the output shaft 1. The fixing bolt 432 passes through the fixing plate 431 and engages with the output shaft 1 by thread, and is used for axial positioning of the outer connecting plate 42.

[0024] Furthermore, in the overload protection transmission separation structure of the above-mentioned mine conveyor reducer, the protective pin 46 is installed in the bolt holes on the inner connecting plate 41 and the outer connecting plate 42. The shear strength of the protective pin 46 matches the design overload threshold of the reducer. Thus, when the output shaft 1 is subjected to torque exceeding the rated value during the transmission process between the inner connecting plate 41 and the outer connecting plate 42 through the protective pin 46, the protective pin 46 will break in shear. The torque value of the output shaft 1 can be adjusted by controlling the number of protective pins 46 installed, the manufacturing material of the protective pins 46, and the diameter of the protective pins 46.

[0025] Preferably, when the output shaft 1 bears a small torque: the protective pin 46 is made of No. 45 steel, with a diameter of 8 to 12 mm, and three are evenly distributed in the circumference; Preferably, when the output shaft 1 bears a medium torque: the protective pin 46 is made of 40Cr material, with a diameter of 15-20mm, and 4 pins are evenly distributed around the circumference; Preferably, when the output shaft 1 bears a large torque: the protective pin 46 is made of 35CrMo material, with a diameter of 25-30mm, and 5 pins are evenly distributed in the circumference.

[0026] Specifically, during operation, the reducer outputs power through the output shaft gear 3, which drives the output shaft gear 3 to transmit torque to the hollow shaft 21. The hollow shaft 21 then drives the inner connecting plate 41 to transmit torque, and the inner connecting plate 41 drives the outer connecting plate 42 to transmit torque through the protective pin 46. The outer connecting plate 41 transmits torque to the output shaft 1 through the spline engagement with the output shaft 1 and the limiting of the fixing component 43. The output shaft 1 then outputs torque. In this state, the hollow shaft 21 rotates synchronously with the output shaft 1. When the torque on the output shaft 1 exceeds the rated value due to reasons such as conveyor jamming, the inner connecting plate 41 transmits torque overload to the outer connecting plate 42 through the protective pin 46. The protective pin 46 is sheared and broken under force, and the inner connecting plate 41 separates from the outer connecting plate 42. At this time, the output shaft gear 3 drives the hollow shaft 21 and the inner connecting plate 41 to continue to rotate, while the hollow shaft 21 rotates on the output shaft 1 through the needle roller bearing 22. The output shaft 1 stops rotating and no longer transmits torque, thus realizing the transmission separation between the output shaft 1 and the output gear.

[0027] In summary, compared with the prior art, the overload protection transmission separation structure of the mine conveyor reducer of the present invention has the following advantages and beneficial effects: The invention provides targeted protection: in case of overload, it directly cuts off the transmission connection between the output shaft and the output gear, avoiding the impact of overload torque on the internal gears and shaft system of the reducer, effectively protecting the integrity of the core transmission components; it has high reliability: adopting a purely mechanical structure, it does not rely on electronic components, making it suitable for the harsh working conditions of humid, dusty, and highly interfering underground mining environments; it has a compact structure: integrated at the output end of the reducer, it does not require additional underground installation space, and maintenance only requires replacing the protective pin to restore its use, making operation convenient; and it ensures no damage to the core components after overload: after separation, the output shaft gear can continue to rotate freely, avoiding damage such as tooth breakage or deformation due to jamming, thus extending the service life of the components.

[0028] It should be noted that, unless otherwise expressly specified and limited, the term "connection" or its synonyms should be interpreted broadly in this document. For example, "connection" can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. Furthermore, expressions such as "first" and "second" are merely used to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Meanwhile, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. In addition, the terms "front," "rear," "left," "right," "upper," and "lower" in this document refer to the placement states shown in the accompanying drawings.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An overload protection transmission separation structure for a mine conveyor reducer, characterized in that, The overload protection transmission separation structure of the mine conveyor reducer includes an output shaft, a transmission assembly, an output shaft gear, and a power cut-off assembly. The transmission assembly is rotatably mounted on the output shaft, and the output shaft gear is sleeved on the transmission assembly for driving the transmission assembly to rotate. The power cut-off assembly is disposed between the power transmission assembly and the output shaft, and the power transmission assembly transmits power to the output shaft through the power cut-off assembly. The power cut-off assembly is used to cut off the transmission between the power transmission assembly and the output shaft in case of overload, wherein: The power cut-off assembly includes an inner connecting plate, an outer connecting plate, a fixing assembly, a first adjusting shim group, a second adjusting shim group, and a protective pin. The inner connecting plate is splinedly connected to the transmission assembly. The outer connecting plate is fixed to the output shaft by the fixing assembly. The first adjusting shim group is disposed on one axial side of the inner connecting plate, and the second adjusting shim group is disposed on one axial side of the outer connecting plate, for adjusting the axial clearance between the inner connecting plate and the outer connecting plate. The protective pin is disposed on the inner connecting plate and the outer connecting plate for transmission between the inner connecting plate and the outer connecting plate.

2. The overload protection transmission separation structure of the mine conveyor reducer according to claim 1, characterized in that, The transmission assembly includes a hollow shaft, a needle roller bearing, a spacer sleeve, and an O-ring seal. The outer side of the needle roller bearing transitions with the inner wall of the hollow shaft, and the inner side of the needle roller bearing is in circumferential contact with the output shaft. The spacer sleeve is disposed between the output shaft and the hollow shaft at the front end of the needle roller bearing for positioning the needle roller bearing. The O-ring seal is disposed between the output shaft and the hollow shaft for sealing the connection between the two shafts.

3. The overload protection transmission separation structure of the mine conveyor reducer according to claim 2, characterized in that, The hollow shaft has an internal spline at its front end and a first keyway in the axial direction on the outer circumference of its rear end.

4. The overload protection transmission separation structure of the mine conveyor reducer according to claim 3, characterized in that, The inner connecting plate is configured as a flange, and the diameter of the flange hole in the middle of the inner connecting plate matches the diameter of the front end of the hollow shaft. An external spline matching the internal spline is provided on the inner wall of the flange hole in the middle of the inner connecting plate. The inner connecting plate and the hollow shaft are connected by the internal spline and the external spline.

5. The overload protection transmission separation structure of the mine conveyor reducer according to claim 3, characterized in that, The inner ring diameter of the output shaft gear matches the rear end diameter of the hollow shaft. A second keyway is provided on the inner ring of the output shaft gear. The first keyway corresponds to the second keyway, and the first keyway and the second keyway are connected by a key.

6. The overload protection transmission separation structure of the mine conveyor reducer according to claim 4, characterized in that, The outer connecting plate is configured as a flange, the diameter of the flange hole in the middle of the outer connecting plate matches the diameter of the front end of the output shaft, the flange hole in the middle of the outer connecting plate is splined with the output shaft for circumferential positioning of the outer connecting plate, and the bolt holes on the outer connecting plate are coaxial with the bolt holes on the inner connecting plate.

7. The overload protection transmission separation structure of the mine conveyor reducer according to claim 6, characterized in that, The fixing component includes a fixing plate and a fixing bolt. The diameter of the fixing plate is smaller than the diameter of the outer connecting plate but larger than the diameter of the output shaft. The fixing bolt passes through the fixing plate and engages with the output shaft threadedly for axial positioning of the outer connecting plate.

8. The overload protection transmission separation structure of the mine conveyor reducer according to claim 6, characterized in that, The protective pin is installed in the bolt holes on the inner connecting plate and the outer connecting plate, and the shear strength of the protective pin matches the design overload threshold of the reducer.

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