A rubber roller line speed difference constant huller

Abstract

The application relates to a rubber roller line speed difference constant thresher, and relates to the technical field of threshers. The application comprises a first rubber roller, a second rubber roller and a gear box, the gear box is provided with a first rotating shaft and a second rotating shaft, the output end of the first rotating shaft is provided with a first rubber roller driving wheel, the first rubber roller driving wheel is connected with the first rubber roller through a belt, the output end of the second rotating shaft is provided with a second rubber roller driving wheel, the second rubber roller driving wheel is connected with the second rubber roller through a belt; the application further comprises a gear shifting device which is used for adjusting the rotating speed of the second rotating shaft. The rotating speed of the second rotating shaft is adjusted through the gear shifting device, so that the rotating speed difference between the first rotating shaft and the second rotating shaft is ensured to be within a proper range, the rotating speed difference between the first rubber roller and the second rubber roller is ensured to be within a proper range, the shelling rate of grains can be ensured, and the breakage rate of the grains can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rice huller, in particular to a rubber roller rice huller with constant linear speed difference. BACKGROUND

[0002] The principle of rubber roller rice huller is that a pair of rubber rollers rotate in opposite directions at different speeds, and under the action of a certain pressure, the rice hulls passing through the pair of rubber rollers are squeezed and rubbed, thereby achieving the purpose of hulling.

[0003] In the process of hulling rice by rubber roller rice huller, it is necessary to ensure that the linear speed difference between the two rubber rollers is within a suitable range. If the linear speed difference is too low, the hulling effect will be poor, and if the linear speed difference is too high, the rice will be easily broken. However, due to the large surface friction coefficient of the rice hulls, the rubber rollers will wear out. The fast roller wears out faster (the diameter decreases faster) and the slow roller wears out slower (the diameter decreases slower). After a certain period of time, the diameter of the fast roller decreases more, while the diameter of the slow roller decreases less. If the rotational speed of the two rubber rollers remains unchanged, the linear speed difference between the fast and slow rollers will decrease, resulting in a decrease in the rice hulling rate. Therefore, in actual use, the linear speed difference between the two rubber rollers of the rubber roller rice huller fluctuates greatly, resulting in a constant change in the rice hulling rate and the rice breakage rate, which is difficult to maintain stable and cannot meet the needs of current production. SUMMARY

[0004] The present application aims to overcome the shortcomings of the prior art and provide a rubber roller rice huller with constant linear speed difference, which can keep the linear speed difference between the two rubber rollers within a suitable range, thereby ensuring the rice hulling rate and reducing the rice breakage rate.

[0005] The present application provides a rubber roller rice huller with constant linear speed difference, which comprises a first rubber roller, a second rubber roller and a gearbox. The gearbox is provided with a first rotating shaft and a second rotating shaft. The output end of the first rotating shaft is provided with a first rubber roller driving wheel, which is connected to the first rubber roller through a belt. The output end of the second rotating shaft is provided with a second rubber roller driving wheel, which is connected to the second rubber roller through a belt. The application further comprises a gear shifting device. The first rotating shaft and the second rotating shaft rotate in opposite directions and have different rotational speeds. The gear shifting device is used to adjust the rotational speed of the second rotating shaft.

[0006] Further, the rubber roller rice huller further comprises a driving motor connected to the input end of the first rotating shaft. The driving motor is used to drive the first rotating shaft to rotate. The second rotating shaft rotates in the opposite direction under the driving of the first rotating shaft. The gear shifting device can adjust the rotational speed of the second rotating shaft.

[0007] Further, the first rotating shaft is provided with a first gear and a second gear, the second rotating shaft is provided with a first driven gear engaged with the first gear and a second driven gear engaged with the second gear, and the gear shifting device is used to switch the first rotating shaft and the second rotating shaft between the engagement of the first gear and the first driven gear and the engagement of the second gear and the second driven gear.

[0008] Further, the driving motor is a variable frequency motor.

[0009] Further, the diameter of the first gear is greater than that of the first driven gear, and the diameter of the second driven gear is greater than that of the second gear.

[0010] Further, the first gear and the first driven gear are mutually engaged helical gears, and the second gear and the second driven gear are mutually engaged helical gears.

[0011] Further, the first driven gear and the second driven gear are sleeved on the second rotating shaft and are in rotational connection with the second rotating shaft, the gear shifting device comprises a gear shifting slider sleeved on the second rotating shaft and in sliding connection with the second rotating shaft, and a driving member used to drive the gear shifting slider to slide axially back and forth along the second rotating shaft, and the gear shifting slider is in cooperation with the first driven gear and the second driven gear respectively when sliding axially back and forth along the second rotating shaft.

[0012] Further, the second rotating shaft is provided with a plurality of sliding grooves arranged along the axial direction on the outer circumferential surface, and the gear shifting slider is provided with a plurality of sliding keys in sliding cooperation with the plurality of sliding grooves respectively.

[0013] Further, opposite side ends of the first driven gear and the second driven gear are provided with a plurality of insertion grooves along the circumferential direction, and both side ends of the gear shifting slider are provided with a plurality of protruding portions in insertion cooperation with the plurality of insertion grooves on the first driven gear or the second driven gear respectively.

[0014] Further, the driving member is a telescopic cylinder, when the telescopic rod of the telescopic cylinder is extended, the gear shifting slider is pushed to move in the direction of the second driven gear, and when the telescopic rod of the telescopic cylinder is retracted, the gear shifting slider is pulled to move in the direction of the first driven gear.

[0015] The rubber roller linear speed difference constant huller has the following advantages:

[0016] (1) The thresher adjusts the rotating speed of the second rotating shaft through the gear shifting device to ensure that the rotating speed difference between the first rotating shaft and the second rotating shaft is within a proper range, and then ensure that the rotating speed difference between the first rubber roller and the second rubber roller is within a proper range, which can not only ensure the husking rate of the grain, but also reduce the breakage rate of the grain;

[0017] (2) The rotating of the first rotating shaft of the thresher is driven by the driving motor, and the rotating of the second rotating shaft is driven by the first rotating shaft, which can not only reduce the number of motors needed to drive the first rotating shaft and the second rotating shaft respectively, thereby reducing the production cost of the thresher and improving the space utilization of the thresher, but also make it difficult to control the rotating speed difference between the first rotating shaft and the second rotating shaft when the two driving motors drive the first rotating shaft and the second rotating shaft to rotate respectively;

[0018] (3) The driving motor of the thresher can be a variable frequency motor, the driving motor is connected with a frequency converter, the rotating speed of the driving motor is controlled through the frequency converter, the stepless adjustment of the rotating speed of the driving motor can be realized, the rotating speed of the first rotating shaft and the second rotating shaft can be changed, and then the rotating speed of the first rubber roller and the second rubber roller can be adjusted, so that the linear speed difference between the first rubber roller and the second rubber roller is always within the optimal setting interval, and the processing effect of the thresher is effectively improved;

[0019] (4) The first drive gear and the first driven gear of the thresher are mutually meshing helical gears, and the second drive gear and the second driven gear are also mutually meshing helical gears, so as to reduce the noise generated by the gearbox during operation;

[0020] (5) The second rotating shaft of the thresher is provided with a plurality of sliding grooves on the outer circumferential surface, and the shifting block is provided with a plurality of sliding keys, and the plurality of sliding keys are matched with the plurality of sliding grooves, so as to make the connection between the shifting block and the second rotating shaft more stable, and then make the axial movement of the shifting block on the second rotating shaft and the synchronous rotation of the second rotating shaft driven by the shifting block more stable;

[0021] (6) The first driven gear and the second driven gear of the thresher are provided with a plurality of insertion grooves on the opposite side ends in the circumferential direction, and the shifting block is provided with a plurality of protruding portions on the two side ends in the circumferential direction, when the plurality of protruding portions on the one side end of the shifting block are simultaneously inserted into the plurality of insertion grooves on the one side end of the first driven gear, the shifting block rotates synchronously with the first driven gear, and when the plurality of protruding portions on the other side end of the shifting block are simultaneously inserted into the plurality of insertion grooves on the one side end of the second driven gear, the shifting block rotates synchronously with the first driven gear. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which are incorporated into and form a part of the specification, illustrate embodiments of the present application and, together with the description, serve to explain the principles of the application. In these drawings, like reference numerals are used to represent similar elements.

[0023] Fig. 1 A structure schematic view of a rubber roller linear speed difference constant thresher of the embodiment of the present application;

[0024] Fig. 2 A structure schematic view of a rubber roller linear speed difference constant gearbox of the embodiment of the present application;

[0025] Fig. 3 A structure schematic view of a second rotating shaft of a rubber roller linear speed difference constant thresher of the embodiment of the present application;

[0026] Fig. 4 A sectional view of a second rotating shaft of a rubber roller linear speed difference constant thresher of the embodiment of the present application.

[0027] In the figure: 1, first rubber roller; 2, second rubber roller; 3, gearbox; 4, first rotating shaft; 5, second rotating shaft; 6, first rubber roller driving wheel; 7, second rubber roller driving wheel; 8, gear shifting device; 81, gear shifting slider; 811, protruding part; 82, telescopic cylinder; 821, cylinder body; 822, connecting rod; 823, rotating rod; 9, driving motor; 10, first gear driving gear; 11, second gear driving gear; 12, first gear driven gear; 121, plug-in slot; 13, second gear driven gear. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the embodiment of the present application more clear, the technical scheme of the embodiment of the present application will be described clearly and completely below by combining the drawings in the embodiment of the present application, and all other embodiments obtained by those skilled in the art without creative labor based on the embodiment in the present application belong to the protection scope of the present application.

[0029] Please refer to Figs. 1-4 The rubber roller linear speed difference constant thresher of the embodiment of the present application comprises a first rubber roller 1, a second rubber roller 2 and a gearbox 3, the gearbox 3 is provided with a first rotating shaft 4 and a second rotating shaft 5, the output end of the first rotating shaft 4 is provided with a first rubber roller driving wheel 6, the first rubber roller driving wheel 6 is connected with the first rubber roller 1 through a belt, the output end of the second rotating shaft 5 is provided with a second rubber roller driving wheel 7, the second rubber roller driving wheel 7 is connected with the second rubber roller 2 through a belt; further comprising a gear shifting device 8, the rotating directions of the first rotating shaft 4 and the second rotating shaft 5 are opposite, the rotating speeds of the first rotating shaft 4 and the second rotating shaft 5 are different, and the gear shifting device 8 is used to adjust the rotating speed of the second rotating shaft 5.

[0030] In the application, the first rotating shaft 4 is provided in the gearbox 3, and the output end of the first rotating shaft 4 is provided with the first rubber roller driving wheel 6. The first rubber roller driving wheel 6 is connected with the first rubber roller 1 through a belt, so that the first rubber roller 1 is driven to rotate synchronously when the first rotating shaft 4 rotates. The second rotating shaft 5 is also provided in the gearbox 3, and the output end of the second rotating shaft 5 is provided with the second rubber roller driving wheel 7. The second rubber roller driving wheel 7 is connected with the second rubber roller 2 through a belt, so that the second rubber roller 2 is driven to rotate synchronously when the second rotating shaft 5 rotates.

[0031] Since the rotating speed of the first rubber roller 1 is proportional to the rotating speed of the first rotating shaft 4, and the rotating direction is the same as that of the first rotating shaft 4, and the rotating speed of the second rubber roller 2 is proportional to the rotating speed of the second rotating shaft 5, and the rotating direction is the same as that of the second rotating shaft 5, when the rotating direction of the first rotating shaft 4 is opposite to that of the second rotating shaft 5 and the rotating speed is different, the rotating direction of the first rubber roller 1 is opposite to that of the second rubber roller 2 and the rotating speed is different, so that the linear speed difference between the first rubber roller 1 and the second rubber roller 2 is generated, and then the first rubber roller 1 and the second rubber roller 2 produce the extrusion and rubbing effect on the grains when the grains pass between the first rubber roller 1 and the second rubber roller 2, so as to realize the hulling of the grains.

[0032] In the design, the linear speed difference between the first rubber roller 1 driven by the first rotating shaft 4 and the second rubber roller 2 driven by the second rotating shaft 5 is set within a suitable range, but in actual use, since the surface friction coefficient of the grain shell is large, the first rubber roller 1 and the second rubber roller 2 produce the extrusion and rubbing effect on the grains, which causes the first rubber roller 1 and the second rubber roller 2 to be worn. Since the rotating speeds of the first rubber roller 1 and the second rubber roller 2 are different, the wear degrees of the first rubber roller 1 and the second rubber roller 2 are different within the same time, that is, the diameters of the first rubber roller 1 and the second rubber roller 2 are reduced by different sizes. At this time, if the rotating speeds of the first rotating shaft 4 and the second rotating shaft 5 are unchanged, that is, the rotating speeds of the first rubber roller 1 and the second rubber roller 2 are unchanged, the linear speed difference between the first rubber roller 1 and the second rubber roller 2 is reduced, and then the hulling rate of the grains is reduced.

[0033] In such a case, the existing huller usually adjusts the distance between the first rubber roller 1 and the second rubber roller 2 manually to increase the pressure between the first rubber roller 1 and the second rubber roller 2, so as to ensure the hulling rate of the grains. However, this method is not only time-consuming and laborious, but also difficult to accurately control the pressure between the first rubber roller 1 and the second rubber roller 2, and it is easy to cause the pressure between the first rubber roller 1 and the second rubber roller 2 to be too large, which increases the breakage rate of the grains. Therefore, in the application, the huller also comprises a gear shifting device 8, which adjusts the rotating speed of the second rotating shaft 5 to ensure that the rotating speed difference between the first rotating shaft 4 and the second rotating shaft 5 is within a suitable range, and then ensures that the rotating speed difference between the first rubber roller 1 and the second rubber roller 2 is within a suitable range, which can not only ensure the hulling rate of the grains, but also reduce the breakage rate of the grains.

[0034] It can be foreseen that in the present application, if the initial setting is that the rotating speed of the first rotating shaft 4 is greater than the rotating speed of the second rotating shaft 5, i.e. the rotating speed of the first rubber roller 1 is greater than the rotating speed of the second rubber roller 2, at this time the linear speed difference between the first rubber roller 1 and the second rubber roller 2 is the initial value. After being used for a period of time, the wear amount of the first rubber roller 1 exceeds the wear amount of the second rubber roller 2 by a certain range, resulting in that the linear speed difference between the first rubber roller 1 and the second rubber roller 2 decreases to the lower limit of the appropriate range, at this time the gear shifting device 8 increases the rotating speed of the second rotating shaft 5, so that the rotating speed of the second rotating shaft 5 is greater than the rotating speed of the first rotating shaft 4, i.e. the rotating speed of the second rubber roller 2 is greater than the rotating speed of the first rubber roller 1, at this time the wear amount of the second rubber roller 2 is greater than the wear amount of the first rubber roller 1, so that in the running process, the total wear amount of the first rubber roller 1 and the second rubber roller 2 gradually approaches the same, i.e. the linear speed difference between the first rubber roller 1 and the second rubber roller 2 gradually approaches the initial value.

[0035] When the total wear amount of the second rubber roller 2 exceeds the total wear amount of the second rubber roller 2 by a certain range, resulting in that the linear speed difference between the first rubber roller 1 and the second rubber roller 2 again decreases to the lower limit of the appropriate range, at this time the gear shifting device 8 decreases the rotating speed of the second rotating shaft 5, so that the rotating speed of the second rotating shaft 5 is less than the rotating speed of the first rotating shaft 4, i.e. the rotating speed of the second rubber roller 2 is less than the rotating speed of the first rubber roller 1, at this time the wear amount of the second rubber roller 2 is less than the wear amount of the first rubber roller 1, so that in the running process, the total wear amount of the first rubber roller 1 and the second rubber roller 2 again approaches the same, i.e. the linear speed difference between the first rubber roller 1 and the second rubber roller 2 again gradually approaches the initial value. Such a cycle is repeated, so that the linear speed difference between the first rubber roller 1 and the second rubber roller 2 is always controlled within the appropriate range.

[0036] In the present embodiment, the huller further comprises a driving motor 9 connected with the input end of the first rotating shaft 4, the driving motor 9 is used to drive the first rotating shaft 4 to rotate, the second rotating shaft 5 reversely rotates under the driving of the first rotating shaft 4, and the gear shifting device 8 can adjust the rotating speed of the second rotating shaft 5. In the present application, the huller further comprises the driving motor 9, the driving motor 9 is arranged outside the transmission 3, and the rotating shaft of the driving motor 9 is connected with the input end of the first rotating shaft 4 to drive the first rotating shaft 4 to rotate.

[0037] A first driving gear 10 and a second driving gear 11 are arranged on the first rotating shaft 4, and a first driven gear 12 and a second driven gear 13 are arranged on the second rotating shaft 5, the first driving gear 10 is engaged with the first driven gear 12, and the second driving gear 11 is engaged with the second driven gear 13, when the first rotating shaft 4 rotates under the driving of the driving motor 9, the first driving gear 10 and the second driving gear 11 rotate to drive the first driven gear 12 and the second driven gear 13 to rotate.

[0038] When the shifting device 8 is engaged with the first driven gear 12, the shifting device 8 is rotated synchronously with the first driven gear 12 through the engagement of the first driving gear 10 and the first driven gear 12, thus driving the second rotating shaft 5 to rotate synchronously.

[0039] Since the diameter of the first driving gear 10 is greater than that of the first driven gear 12, when the shifting device 8 is engaged with the first driven gear 12, the shifting device 8 is rotated synchronously with the first driven gear 12 through the engagement of the first driving gear 10 and the first driven gear 12, thus driving the second rotating shaft 5 to rotate synchronously, and the rotating speed of the first rotating shaft 4 is greater than that of the second rotating shaft 5, i.e. the rotating speed of the first rubber roller 1 is greater than that of the second rubber roller 2. After a period of use, when the wear of the first rubber roller 1 exceeds that of the second rubber roller 2 by a certain range, the rotating speed difference between the first rubber roller 1 and the second rubber roller 2 is reduced to the lower limit of the appropriate range, the shifting device 8 is switched to engage with the second driven gear 13, the shifting device 8 is rotated synchronously with the second driven gear 13 through the engagement of the second driving gear 11 and the second driven gear 13, thus driving the second rotating shaft 5 to rotate synchronously, and since the diameter of the second driven gear 13 is greater than that of the second driving gear 11, the rotating speed of the second rotating shaft 5 is greater than that of the first rotating shaft 4, i.e. the rotating speed of the second rubber roller 2 is greater than that of the first rubber roller 1, and at this time, the wear of the second rubber roller 2 is greater than that of the first rubber roller 1, so that in the running process, the total wear of the first rubber roller 1 and the second rubber roller 2 gradually approaches the same, i.e. the rotating speed difference between the first rubber roller 1 and the second rubber roller 2 gradually approaches the initial value.

[0040] When the total wear of the second rubber roller 2 exceeds that of the second rubber roller 2 by a certain range, the rotating speed difference between the first rubber roller 1 and the second rubber roller 2 is again reduced to the lower limit of the appropriate range, the shifting device 8 is switched to engage with the first driven gear 12, and the rotating speed of the first rubber roller 1 is greater than that of the second rubber roller 2. At this time, the wear of the second rubber roller 2 is less than that of the first rubber roller 1, so that in the running process, the total wear of the first rubber roller 1 and the second rubber roller 2 again approaches the same, i.e. the rotating speed difference between the first rubber roller 1 and the second rubber roller 2 again gradually approaches the initial value. Thus, through the switching of the shifting device 8 between engaging with the first driven gear 12 and engaging with the second driven gear 13, the rotating speed difference between the first rubber roller 1 and the second rubber roller 2 is always controlled within the appropriate range.

[0041] It can be foreseen that, since the first drive gear 10 and the second drive gear 11 are arranged on the first rotating shaft 4 at the same time, the first driven gear 12 and the second driven gear 13 are arranged on the second rotating shaft 5 at the same time, and the first drive gear 10 is engaged with the first driven gear 12 at the same time as the second drive gear 11 is engaged with the second driven gear 13, in order to make the diameter of the first drive gear 10 greater than the diameter of the first driven gear 12 and the diameter of the second driven gear 13 greater than the diameter of the second drive gear 11, the first drive gear 10 and the first driven gear 12 are engaged and the second drive gear 11 and the second driven gear 13 are not over-matched or unable to be matched, the diameter of the first drive gear 10 is arranged to be greater than the diameter of the second drive gear, and the diameter of the second driven gear 13 is arranged to be greater than the diameter of the first driven gear 12. In the present application, the diameter of the first drive gear 10 is equal to the diameter of the second driven gear 13, the diameter of the second drive gear 11 is equal to the diameter of the first driven gear 12, and the diameter of the first drive gear 10 and the second driven gear 13 is greater than the diameter of the first driven gear 12 and the second drive gear 11.

[0042] In the present application, the rotation of the first rotating shaft 4 is driven by the driving motor 9, and the rotation of the second rotating shaft 5 is driven by the first rotating shaft 4, rather than using two driving motors 9 to separately drive the first rotating shaft 4 and the second rotating shaft 5, on the one hand, the number of motors required to separately drive the first rotating shaft 4 and the second rotating shaft 5 can be reduced, thereby not only reducing the production cost of the rice huller, but also improving the space utilization of the rice huller; on the other hand, it is difficult to control the speed difference of the first rotating shaft 4 and the second rotating shaft 5 by using two driving motors 9 to separately drive the first rotating shaft 4 and the second rotating shaft 5.

[0043] It can be foreseen that the driving motor 9 is connected to the input end of the first rotating shaft 4 through a shaft coupling, in the present application, the driving motor 9 driving the first rotating shaft 4 can adopt a variable frequency motor, the driving motor 9 is connected to a frequency converter, the speed of the driving motor 9 is controlled through the frequency converter, the stepless adjustment of the speed of the driving motor 9 can be realized, thereby changing the speed of the first rotating shaft 4 and the second rotating shaft 5, and further adjusting the speed of the first rubber roller 1 and the second rubber roller 2, ensuring that the linear speed difference of the first rubber roller 1 and the second rubber roller 2 is always within the optimal setting range, and effectively improving the processing effect of the rice huller.

[0044] In the embodiment, the first driven gear 12 and the second driven gear 13 are sleeved on the second rotating shaft 5 and are in rotating connection with the second rotating shaft 5, the gear shifting device 8 comprises a gear shifting block 81 which is sleeved on the second rotating shaft 5 and is in sliding connection with the second rotating shaft 5, and a driving member which drives the gear shifting block 81 to axially slide on the second rotating shaft 5, the gear shifting block 81 is in insertion with the first driven gear 12 and the second driven gear 13 when axially sliding on the second rotating shaft 5. The first driven gear 12 and the second driven gear 13 are axially fixed on the second rotating shaft 5 and are in rotating connection with the second rotating shaft 5 in the circumferential direction, thus when the first rotating shaft 4 rotates under the driving of the driving motor 9, the first driven gear 12 and the second driven gear 13 can only be reversely rotated by the meshing of the first driving gear 10 and the first driven gear 12 and the meshing of the second driving gear 11 and the second driven gear 13, and the second rotating shaft 5 cannot be synchronously rotated.

[0045] The gear shifting device 8 comprises the gear shifting block 81 and the driving member, the gear shifting block 81 is sleeved on the second rotating shaft 5 and is fixedly connected with the second rotating shaft 5 in the circumferential direction and is in sliding connection with the second rotating shaft 5 in the axial direction, thus the gear shifting block 81 can axially move on the second rotating shaft 5, but when the gear shifting block 81 rotates, the second rotating shaft 5 will be synchronously rotated. The driving member is used to drive the gear shifting block 81 to axially move on the second rotating shaft 5, and the gear shifting block 81 is located between the first driven gear 12 and the second driven gear 13 on the second rotating shaft 5.

[0046] When the driving member drives the gear shifting block 81 to move on the second rotating shaft 5 towards the first driven gear 12 until the gear shifting block 81 is matched with the first driven gear 12, the first driven gear 12 is rotated to synchronously rotate the gear shifting block 81, thus the second rotating shaft 5 is synchronously rotated by the gear shifting block 81; when the driving member drives the gear shifting block 81 to move on the second rotating shaft 5 towards the second driven gear 13 until the gear shifting block 81 is matched with the second driven gear 13, the second driven gear 13 is rotated to synchronously rotate the gear shifting block 81, thus the second rotating shaft 5 is synchronously rotated by the gear shifting block 81, and the rotation speed of the second rotating shaft 5 is adjusted.

[0047] In the embodiment, the meshing of the first driving gear 10 and the first driven gear 12 and the meshing of the second driving gear 11 and the second driven gear 13 can adopt the straight gear transmission mode or the helical gear transmission mode, in the application, the first driving gear 10 and the first driven gear 12 are helical gears which are in meshing with each other, and the second driving gear 11 and the second driven gear 13 are also helical gears which are in meshing with each other, thus the noise generated by the gearbox 3 during operation is reduced.

[0048] In the embodiment, the second rotating shaft 5 is provided with a plurality of sliding grooves arranged in the axial direction on the outer circumferential surface, and the gear shifting sliding block 81 is provided with a plurality of sliding keys respectively in sliding cooperation with the plurality of sliding grooves. The plurality of sliding grooves are arranged in the circumferential direction on the outer circumferential surface of the second rotating shaft 5, and the gear shifting sliding block 81 is provided with the plurality of sliding keys. When the gear shifting sliding block 81 is sleeved on the first rotating shaft 4, the plurality of sliding keys are respectively in sliding cooperation with the plurality of sliding grooves, so that the gear shifting sliding block 81 is fixedly connected with the second rotating shaft 5 in the circumferential direction and is slidingly connected with the second rotating shaft 5 in the axial direction, and further, the gear shifting sliding block 81 can move axially along the second rotating shaft 5, and when the gear shifting sliding block 81 rotates, the second rotating shaft 5 can be driven to rotate synchronously.

[0049] The plurality of sliding grooves are arranged on the outer circumferential surface of the second rotating shaft 5, and the plurality of sliding keys are arranged on the gear shifting sliding block 81, and the plurality of sliding keys are respectively in cooperation with the plurality of sliding grooves, so as to make the connection between the gear shifting sliding block 81 and the second rotating shaft 5 more stable, and further, the axial movement of the gear shifting sliding block 81 on the second rotating shaft 5 and the synchronous rotation of the second rotating shaft 5 driven by the gear shifting sliding block 81 are more stable.

[0050] In the embodiment, the opposite side ends of the first driven gear 12 and the second driven gear 13 are provided with a plurality of insertion grooves 121 arranged in the circumferential direction, and the two side ends of the gear shifting sliding block 81 are provided with a plurality of protruding portions 811 arranged in the circumferential direction, and the plurality of protruding portions 811 are respectively inserted into the plurality of insertion grooves 121 on the first driven gear 12 or the second driven gear 13. The first driven gear 12 and the second driven gear 13 are both sleeved on the second rotating shaft 5, and the opposite side ends of the first driven gear 12 and the second driven gear 13 are provided with the plurality of insertion grooves 121 arranged in the circumferential direction. The gear shifting sliding block 81 is sleeved on the second rotating shaft 5 and located between the first driven gear 12 and the second driven gear 13, and when the gear shifting sliding block 81 moves axially on the second rotating shaft 5, it moves towards the first driven gear 12 or the second driven gear 13.

[0051] A plurality of protruding portions 811 are arranged on both side ends of the shift slider 81 in the circumferential direction. The plurality of protruding portions 811 on one side end of the shift slider 81 correspond to the plurality of insertion grooves 121 on one side end of the first driven gear 12 in the circumferential direction, and the plurality of protruding portions 811 on the other side end of the shift slider 81 correspond to the plurality of insertion grooves 121 on one side end of the second driven gear 13 in the circumferential direction. Thus, when the driving member drives the shift slider 81 to move on the second rotating shaft 5 in the axial direction towards the first driven gear 12 until the plurality of protruding portions 811 on one side end of the shift slider 81 are simultaneously inserted into the plurality of insertion grooves 121 on one side end of the first driven gear 12, the first driven gear 12 rotates to drive the shift slider 81 to rotate synchronously, so that the second rotating shaft 5 is driven to rotate synchronously by the shift slider 81. When the driving member drives the shift slider 81 to move on the second rotating shaft 5 in the axial direction towards the second driven gear 13 until the plurality of protruding portions 811 on the other side end of the shift slider 81 are simultaneously inserted into the plurality of insertion grooves 121 on one side end of the second driven gear 13, the second driven gear 13 rotates to drive the shift slider 81 to rotate synchronously, so that the second rotating shaft 5 is driven to rotate synchronously by the shift slider 81.

[0052] In the present embodiment, the driving member is a telescopic cylinder 82. When the telescopic rod of the telescopic cylinder 82 extends, the shift slider 81 is pushed to move towards the second driven gear 13. When the telescopic rod of the telescopic cylinder 82 retracts, the shift slider 81 is pulled to move towards the first driven gear 12. In the present application, the driving member can be a telescopic cylinder 82. When the telescopic rod of the telescopic cylinder 82 retracts, the shift slider 81 is pulled to move on the second rotating shaft 5 in the axial direction towards the first driven gear 12 until the plurality of protruding portions 811 on one side end of the shift slider 81 are simultaneously inserted into the plurality of insertion grooves 121 on one side end of the first driven gear 12, so that the shift slider 81 rotates synchronously with the first driven gear 12. When the telescopic rod of the telescopic cylinder 82 extends, the shift slider 81 is pushed to move on the second rotating shaft 5 in the axial direction towards the second driven gear 13 until the plurality of protruding portions 811 on the other side end of the shift slider 81 are simultaneously inserted into the plurality of insertion grooves 121 on one side end of the second driven gear 13, so that the shift slider 81 rotates synchronously with the second driven gear 13.

[0053] In the present application, the specific implementation of the driving member can be that the cylinder body 821 of the telescopic cylinder 82 is arranged at the end of the second rotating shaft 5, and a cavity accommodating the telescopic rod of the telescopic cylinder 82 is arranged on the central axis of the second rotating shaft 5. The telescopic rod of the telescopic cylinder 82 includes a connecting rod 822 connected to the cylinder body 821 of the telescopic cylinder 82, and a rotating rod 823 inserted at the end of the connecting rod 822. A bearing member is arranged between the rotating rod 823 and the connecting rod 822. The rotating rod 823 penetrates through the side wall of the cavity of the second rotating shaft 5 and is fixedly connected to the shift slider 81 sleeved on the second rotating shaft 5.

[0054] It can be foreseen that a strip-shaped hole is arranged on the second rotating shaft 5 in the axial direction to communicate the cavity with the outside, and the end of the rotating rod 823 extending out of the strip-shaped hole is fixedly connected with the shift slider 81. When the connecting rod 822 is extended or retracted in the axial direction of the cylinder body 821 of the telescopic cylinder 82, the rotating rod 823 is synchronously moved in the axial direction, and the end of the rotating rod 823 fixedly connected with the shift slider 81 can be moved in the axial direction along the strip-shaped hole, so that the rotating rod 823 drives the shift slider 81 to move in the axial direction on the second rotating shaft 5. Since the end of the rotating rod 823 is fixedly connected with the shift slider 81, when the shift slider 81 is rotated under the drive of the first driven gear 12 or the second driven gear 13, the rotating rod 823 is synchronously rotated, and since the bearing member is arranged between the rotating rod 823 and the connecting rod 822, the connecting rod 822 will not be rotated with the rotating rod 823.

[0055] The above-described content can be implemented individually or in various combinations, and these variants are within the protection scope of the present application.

[0056] It should be noted that, in this document, the terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment containing a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, article or equipment including the element.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit it. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A rice huller with a constant linear speed difference of rubber rollers, characterized in that: The system includes a first rubber roller (1), a second rubber roller (2), and a gearbox (3). The gearbox (3) has a first rotating shaft (4) and a second rotating shaft (5). The output end of the first rotating shaft (4) has a first rubber roller drive wheel (6), which is connected to the first rubber roller (1) by a belt. The output end of the second rotating shaft (5) has a second rubber roller drive wheel (7), which is connected to the second rubber roller (2) by a belt. The system also includes a shifting device (8). The first rotating shaft (4) and the second rotating shaft (5) rotate in opposite directions, and their rotational speeds are different. The shifting device (8) is used to adjust the rotational speed of the second rotating shaft (5). The second rotating shaft (5) rotates in the opposite direction under the drive of the first rotating shaft (4). The first rotating shaft (4) is provided with a first-gear drive gear (10) and a second-gear drive gear (11). The second rotating shaft (5) is provided with a first-gear driven gear (12) meshing with the first-gear drive gear (10) and a second-gear driven gear (13) meshing with the second-gear drive gear (11). The shifting device (8) is used to switch the first rotating shaft (4) and the second rotating shaft (5) between the first-gear drive gear (10) meshing with the first-gear driven gear (12) and the second-gear drive gear (11) meshing with the second-gear driven gear (13). The diameter of the first gear drive gear (10) is larger than the diameter of the first gear driven gear (12), and the diameter of the second gear driven gear (13) is larger than the diameter of the second gear drive gear (11). While the first gear drive gear (10) and the first gear driven gear (12) are meshing, the second gear drive gear (11) and the second gear driven gear (13) are meshing. The first gear driven gear (12) and the second gear driven gear (13) are sleeved on the second rotating shaft (5) and rotatably connected to the second rotating shaft (5). The shifting device (8) includes a shifting slider (81) sleeved on the second rotating shaft (5) and slidably connected to the second rotating shaft (5), and a driving member that drives the shifting slider (81) to slide axially back and forth along the second rotating shaft (5). When the shifting slider (81) slides axially back and forth along the second rotating shaft (5), it cooperates with the first gear driven gear (12) and the second gear driven gear (13) respectively. The first gear driven gear (12) and the second gear driven gear (13) are provided with a plurality of insertion slots (121) along the circumferential direction on one side of their opposite sides. The shift slider (81) is provided with a plurality of protrusions (811) along the circumferential direction on both sides of its two sides. The plurality of protrusions (811) are respectively inserted into the plurality of insertion slots (121) on the first gear driven gear (12) or the second gear driven gear (13). The end of the protrusion (811) that is inserted into the insertion groove (121) is provided with an arc-shaped guide surface, and the width of the protrusion (811) is smaller than the width of the insertion groove (121).

2. A rice huller with constant linear speed difference of rubber rollers as described in claim 1, characterized in that: The rice huller also includes a drive motor (9) connected to the input end of the first rotating shaft (4), the drive motor (9) is used to drive the first rotating shaft (4) to rotate, and the shifting device (8) can adjust the speed of the second rotating shaft (5).

3. A rice huller with constant linear speed difference of rubber rollers as described in claim 2, characterized in that: The drive motor (9) is a variable frequency motor.

4. A rice huller with constant linear speed difference of rubber rollers as described in claim 1, characterized in that: The first gear drive gear (10) and the first gear driven gear (12) are meshing helical gears, and the second gear drive gear (11) and the second gear driven gear (13) are meshing helical gears.

5. A rice huller with constant linear speed difference of rubber rollers as described in claim 1, characterized in that: The second rotating shaft (5) has a plurality of axially arranged sliding grooves on its outer circumferential surface, and the shift slider (81) has a plurality of sliding keys that slide in cooperation with the plurality of sliding grooves respectively.

6. A rice huller with constant linear speed difference of rubber rollers as described in claim 1, characterized in that: The driving component is a telescopic cylinder (82). When the telescopic rod of the telescopic cylinder (82) extends, it pushes the shift slider (81) to move toward the second gear driven gear (13). When the telescopic rod of the telescopic cylinder (82) retracts, it pulls the shift slider (81) to move toward the first gear driven gear (12).

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