Planetary plate gear box of floor grinding machine

Abstract

The planetary plate gearbox comprises a box body, a driving gear shaft, a first gear set and a second gear set are arranged in the box body, the driving gear shaft penetrates through the top of the box body and is rotationally connected with the box body, and the first gear set and the second gear set are oppositely arranged up and down. The second gear set is in transmission connection with the first gear set and the driving gear shaft, an oil lifting device is arranged on the lower portion in the box body and connected with the first gear set, and a grinding disc is rotationally arranged below the box body and connected with the second gear set. According to the oil lifting device, the propeller blades rotate under the transmission connection of the driving gear shaft, the first gear set and the second gear set, lubricating oil in the lower shell is lifted into the upper shell in the rotating process of the propeller blades, and the lubricating oil falls into the lower shell again through the oil passing holes, so that the lubricating oil circularly flows in the box body, and the lubricating effect is improved. And heat dissipation is facilitated, and reduction of the lubricating performance caused by local overheating of the lubricating oil is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of grinding devices, in particular to a planetary disc gear box for a floor grinding machine. Background Art

[0002] The grinding disc of a floor grinder is used to grind and polish floors. It's driven by a motor through a transmission mechanism (such as pulleys and gears). A planetary gearbox rotates like a "satellite" with the mounted grinding disc. During surface treatment, the grinding disc and the planetary gearbox rotate in different directions, resulting in a more uniform and efficient grinding process. For this reason, existing floor grinders are increasingly adopting planetary gearboxes instead of traditional transmission mechanisms.

[0003] However, during operation, insufficient lubricant or overloaded equipment can cause the internal temperature of the lubricant in a planetary gearbox to rise rapidly. Coupled with the lack of effective heat dissipation within the planetary gearbox, excessively high oil temperatures can accelerate oxidation and deterioration of the lubricant, reducing its lubrication properties and potentially causing partial damage to related components within the gearbox. Utility Model Content

[0004] In view of the above problems, the purpose of the present invention is to provide a planetary gearbox for a floor grinder to solve the problem of reduced lubrication performance caused by the lack of a heat dissipation device in the existing planetary gearbox.

[0005] The utility model is achieved in this way:

[0006] A planetary gearbox for a floor grinder includes a box body, in which a driving gear shaft, a first gear set and a second gear set are arranged. The driving gear shaft passes through the top of the box body and is rotatably connected thereto. The first gear set and the second gear set are arranged opposite to each other up and down. The second gear set is respectively connected to the first gear set and the driving gear shaft in a transmission manner. An oil lifting device is provided at the lower part of the box body, which is connected to the first gear set. A grinding disc is rotatably provided at the bottom of the box body, which is connected to the second gear set.

[0007] Furthermore, the box body includes an upper shell and a lower shell, the upper shell is a cavity with an open bottom, and the lower shell is a cavity with an open top, and the upper shell and the lower shell are fixedly connected by an intermediate plate.

[0008] Furthermore, the second gear set is located in the lower housing, and the second gear set includes at least one first driven gear meshing with the driving gear shaft, and the first rotating shaft is coaxially passed through the first driven gear. There are at least two grinding discs, and the second rotating shaft is coaxially passed through the grinding disc. The second rotating shaft is also coaxially sleeved with a second driven gear, and one of the second driven gears is meshing with the first driven gear, and the other second driven gear is connected to the first driven gear through an intermediate gear.

[0009] Furthermore, there are two first driven gears, which are respectively located on opposite sides of the driving gear shaft, and there are four second driven gears, and each first driven gear is meshed and connected with two second driven gears.

[0010] Furthermore, the first gear set is located in the upper housing, and the first gear set includes a sun gear, which is located at the center of the upper housing. The sun gear is rotatably connected to the driving gear shaft, and the outer side of the sun gear is meshed with the third driven gear and the fourth driven gear. The first rotating shaft passes through the middle plate and extends upward into the upper housing. The third driven gear is fixedly connected to the top of the first rotating shaft. The fourth rotating shaft is coaxially penetrated on the fourth driven gear. The fourth rotating shaft passes through the middle plate and extends into the lower housing. The bottom end of the fourth rotating shaft is connected to the oil lifting device.

[0011] Furthermore, the number of the third driven gear and the number of the fourth driven gear are both two, and the third driven gear and the fourth driven gear are arranged at intervals on the outer periphery of the sun gear.

[0012] Furthermore, the oil lifting device includes a connecting shaft, which is coaxially fixedly connected to the fourth rotating shaft. A plurality of propeller blades are provided on the outer periphery of the connecting shaft, and the plurality of propeller blades are evenly distributed along the circumference of the connecting shaft.

[0013] Furthermore, the outer cover of the propeller blade is provided with a connecting tube, and the top of the connecting tube is fixedly connected to the bottom of the middle plate.

[0014] Furthermore, the fourth driven gear is provided with a plurality of through holes, the middle plate is provided with an oil containing cavity, the fourth rotating shaft is rotatably arranged in the oil containing cavity, and the oil containing cavity is correspondingly provided with a plurality of through holes.

[0015] Furthermore, an oil filling hole and a plurality of oil holes are provided on the middle plate.

[0016] The beneficial effects of the utility model are:

[0017] In the planetary gearbox for a floor grinder of the present invention, the propeller blades in the oil-lifting device rotate under the transmission connection of the drive gear shaft, the first gear set, and the second gear set. During the rotation of the propeller blades, the lubricating oil in the lower housing is lifted upward into the upper housing, and then falls back into the lower housing through the oil hole, so that the lubricating oil forms a circulation flow within the housing, which not only helps to dissipate heat and reduce the temperature within the housing, but also reduces the degradation of lubrication performance caused by local overheating of the lubricating oil. Moreover, the propeller blade's oil-lifting device can effectively lift the lubricating oil at the bottom of the housing to a higher position through the force generated by its rotation, thereby ensuring that each lubrication point within the housing is fully lubricated. In addition, the stirring action of the propeller blades increases the activity of the lubricating oil, allowing it to more effectively penetrate into the tiny gaps between the gears, thereby reducing friction and wear and extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0019] Figure 2 It is a cross-sectional view of the utility model;

[0020] Figure 3 This is a schematic diagram of the three-dimensional structure of the utility model without the upper shell and the middle plate;

[0021] Figure 4 This is a schematic diagram of the three-dimensional structure of the utility model without the upper shell;

[0022] Figure 5 It is a schematic diagram of the three-dimensional structure of the second gear set, the driving gear shaft and the lower housing of the utility model;

[0023] Figure 6 This is a cross-sectional view of the partial connection structure of the oil lifting device, the fourth rotating shaft, and the intermediate plate of the utility model;

[0024] Figure 7 This is an exploded view of the oil lifting device and the fourth rotating shaft of the utility model.

[0025] Description of reference numerals:

[0026] 1. Box body; 11. Upper shell; 12. Lower shell; 13. Middle plate; 131. Oil chamber; 132. Oil filling hole; 133. Oil hole;

[0027] 2. Drive gear shaft;

[0028] 3. First gear set; 31. Sun gear; 32. Third driven gear; 33. Fourth driven gear; 331. Through hole; 34. Fourth rotating shaft;

[0029] 4. Second gear set; 41. First driven gear; 42. First rotating shaft; 43. Second rotating shaft; 44. Second driven gear; 45. Intermediate gear; 46. Third rotating shaft;

[0030] 5. Oil lifting device; 51. Connecting shaft; 52. Propeller blade; 53. Connecting cylinder; 54. Connecting bolt; 55. Nut; 6. Grinding disc. DETAILED DESCRIPTION

[0031] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0032] like Figures 1 to 3 The figure shows a planetary gearbox for a floor grinder according to the present invention, comprising a housing 1, within which are disposed a drive gear shaft 2, a first gear set 3, and a second gear set 4. The drive gear shaft 2 extends through the top of the housing 1 and is rotatably connected thereto. The first and second gear sets 3 and 4 are disposed vertically opposite each other, with the second gear set 4 being transmission-connected to the first and drive gear shafts 3 and 2, respectively. An oil-raising device 5 is disposed at the bottom of the housing 1 and is connected to the first gear set 3. A grinding disc 6 is rotatably disposed below the housing 1 and is connected to the second gear set 4. The drive gear shaft 2 is fixedly connected to the output shaft of a drive motor (not shown) to provide power to the gearbox.

[0033] like Figure 1 and Figure 2 As shown, the housing 1 includes an upper shell 11 and a lower shell 12. The upper shell 11 is a cavity with an open bottom, and the lower shell 12 is a cavity with an open top. The upper shell 11 and the lower shell 12 are fixedly connected by an intermediate plate 13. The upper shell 11 and the intermediate plate 13 form an upper cavity, and the lower shell 12 and the intermediate plate 13 form a lower cavity.

[0034] like Figure 3 and Figure 5As shown, the second gear set 4 is located within the lower housing 12 and includes at least one first driven gear 41 meshing with the drive gear shaft 2. A first rotating shaft 42 is coaxially provided on the first driven gear 41. There are at least two grinding discs 6, each coaxially provided with a second rotating shaft 43. A second driven gear 44 is coaxially sleeved on the second rotating shaft 43. One of the second driven gears 44 is meshing with the first driven gear 41, and the other second driven gear 44 is transmission-connected to the first driven gear 41 via an intermediate gear 45. A third rotating shaft 46 is also rotatably provided within the lower housing 12, and the intermediate gear 45 is coaxially sleeved on the outer side of the third rotating shaft 46. In this embodiment, there are two first driven gears 41, located on opposite sides of the drive gear shaft 2. There are four second driven gears 44, with each first driven gear 41 meshing with two second driven gears 44.

[0035] When the drive gear shaft 2 rotates, the two first driven gears 41 rotate in the opposite direction to the drive gear shaft 2. The second driven gear 44 and the intermediate gear 45 directly meshed with the first driven gear 41 rotate in the same direction as the drive gear shaft 2, while the other second driven gear 44 meshed with the intermediate gear 45 rotates in the opposite direction to the drive gear shaft 2. Therefore, the two adjacent second driven gears 44 rotate in opposite directions, which in turn causes the two adjacent second rotating shafts 43 and grinding discs 6 to rotate in opposite directions. In this embodiment, the two adjacent grinding discs 6 rotate in opposite directions, while the two facing grinding discs 6 rotate in the same direction. The opposing grinding discs 6 and the adjacent grinding discs 6 use opposite fixing screws, so that as the grinding discs 6 rotate, they become tighter and less likely to loosen.

[0036] like Figure 4 As shown, the first gear set 3 is located within the upper housing 11 and includes a sun gear 31, located at the center of the upper housing 11 and rotatably connected to the drive gear shaft 2. A third driven gear 32 and a fourth driven gear 33 are meshedly connected to the outer side of the sun gear 31. A first rotating shaft 42 passes through the intermediate plate 13 and extends upward into the upper housing 11. The third driven gear 32 is fixedly connected to the top end of the first rotating shaft 42. A fourth rotating shaft 34 coaxially extends through the fourth driven gear 33. The fourth rotating shaft 34 passes through the intermediate plate 13 and extends into the lower housing 12. The bottom end of the fourth rotating shaft 34 is connected to the oil lifting device 5. There are two third and fourth driven gears 32, 33, respectively, spaced apart on the outer periphery of the sun gear 31.

[0037] When the driving gear shaft 2 rotates, the two first driven gears 41 rotate in the opposite direction to the driving gear shaft 2. The rotation of the two first driven gears 41 drives the two first rotating shafts 42 fixedly connected to them to rotate. The rotation of the two first rotating shafts 42 drives the two third driven gears 32 fixedly connected to their tops to rotate, thereby causing the two third driven gears 32 to rotate while revolving around the sun gear 31. At the same time, the two first rotating shafts 42 apply a torsional force to the housing 1, thereby driving the housing 1 to rotate. Because adjacent grinding discs 6 rotate in opposite directions, the forces exerted on the ground by each grinding disc 6 are balanced during grinding operations, which is conducive to the stable operation of the grinding disc 6. Each grinding disc 6 both rotates and revolves with the housing 1, resulting in high grinding efficiency and good grinding quality.

[0038] like Figure 6 and Figure 7 As shown, the oil lifting device 5 includes a connecting shaft 51, which is coaxially fixedly connected to the fourth rotating shaft 34. In this embodiment, the connecting shaft 51 is a hollow shaft, and a cavity is provided at the bottom of the fourth rotating shaft 34. A connecting bolt 54 is provided in the cavity. One end of the connecting bolt 54 is fixedly connected to the fourth rotating shaft 34, and the other end is inserted into the connecting shaft 51. A nut 55 is threadedly connected at the bottom to tighten the connecting shaft 51 to the fourth rotating shaft 34. The connection between the two is detachable, facilitating routine maintenance and repair. A plurality of propeller blades 52 are fixedly provided on the outer periphery of the connecting shaft 51, and the plurality of propeller blades 52 are evenly distributed along the circumference of the connecting shaft 51. A connecting tube 53 is provided on the outer side of the propeller blades 52, and the top of the connecting tube 53 is fixedly connected to the bottom of the intermediate plate 13. The fourth driven gear 33 is provided with a plurality of through holes 331, and the intermediate plate 13 is provided with an oil containing chamber 131. The fourth rotating shaft 34 is rotatably disposed in the oil containing chamber 131. The oil containing chamber 131 has a plurality of corresponding through holes (not shown in the figure). The through holes are located between the connecting cylinder 53 and the oil containing chamber 131. The through holes connect the connecting cylinder 53 and the oil containing chamber 131. The intermediate plate 13 is provided with an oil filling hole 132 and a plurality of oil holes 133.

[0039] With this arrangement, sufficient lubricating oil is injected into the lower housing 12 through the oil filling hole 132. When the driving gear shaft 2 rotates, it drives the first driven gear 41 to rotate. The rotation of the first driven gear 41 drives the first rotating shaft 42 fixed thereto to rotate. The rotation of the first rotating shaft 42 drives the third driven gear 32 to rotate. The rotation of the third driven gear 32 drives the case 1 to rotate. The rotation of the case 1 drives the fourth driven gear 33 engaged with the sun gear 31 to rotate both on itself and revolve around the sun gear 31. The rotation of the fourth driven gear 33 drives the fourth rotating shaft 34 fixed to it to rotate. The rotation of the fourth rotating shaft 34 drives the fourth driven gear 33 engaged with the sun gear 31 to rotate. As the fixed connecting shaft 51 and propeller blade 52 rotate, the lubricating oil within the lower housing 12, lifted by the rotating propeller blade 52, first enters the connecting tube 53 and then, through multiple through-holes, enters the oil chamber 131 of the intermediate plate 13. Under the centrifugal force of the rotating gears, it enters the upper chamber through the multiple through-holes 331 in the fourth driven gear 33 before falling into the lower chamber through the oil holes 133. This circulates the lubricating oil within the upper and lower chambers, helping to dissipate heat, lower the temperature within the housing 1, and mitigate the degradation of lubrication performance caused by localized overheating of the lubricating oil. Furthermore, the oil-lifting device 5 of the propeller blade 52, through the force generated by its rotation, effectively lifts the lubricating oil from the bottom of the housing 1 to a higher position, ensuring that all lubrication points within the housing 1 are fully lubricated. Furthermore, the stirring action of the propeller blade 52 increases the activity of the lubricating oil, allowing it to more effectively penetrate the tiny gaps between the gears, thereby reducing friction and wear and extending its service life.

[0040] When the planetary gearbox of the floor grinder of the present invention is in use, the driving motor is started, and the output shaft of the driving motor rotates to drive the driving gear shaft 2 fixedly connected thereto to rotate, and the driving gear shaft 2 rotates to drive the first driven gear 41 meshed with it to rotate, and the first driven gear 41 drives the second driven gear 44 meshed with it to rotate in the opposite direction, and the second driven gear 44 rotates in the opposite direction to drive the second rotating shaft 43 fixedly connected thereto to rotate, and the rotation of the second rotating shaft 43 drives the grinding disc 6 fixed at its bottom to rotate; the first driven gear 41 rotates and at the same time drives the first rotating shaft 42 fixedly connected thereto to rotate, and the first rotating shaft 42 rotates and drives the third driven gear 32 fixedly connected to its top to revolve around the sun gear 31 while rotating, and at the same time, the rotation of the third driven gear 32 drives the box body 1 to rotate, and the box The rotation of the body 1 drives the fourth driven gear 33 meshing with the sun gear 31 to rotate and revolve around the sun gear 31. The rotation of the fourth driven gear 33 drives the fourth rotating shaft 34 fixedly connected to it to rotate. The rotation of the fourth rotating shaft 34 drives the connecting shaft 51 and the propeller blade 52 fixedly connected to it to rotate. The lubricating oil in the lower shell 12 enters the oil holding cavity 131 of the intermediate plate 13 through multiple through holes under the lift of the rotating propeller blade 52, and enters the upper cavity through the multiple through holes 331 on the fourth driven gear 33 under the centrifugal force when each gear rotates, and then falls into the lower cavity from each oil hole 133, thereby realizing the circulation of the lubricating oil in the upper cavity and the lower cavity, which helps to dissipate heat, reduce the temperature in the box body 1, and reduce the degradation of lubrication performance caused by local overheating of the lubricating oil.

[0041] Although the present invention discloses preferred specific embodiments to achieve the above-mentioned objectives, it is not intended to limit the structural features of the present invention. Any person skilled in the art should know that within the technical spirit of the present invention, any easily conceivable changes or modifications are possible and are all covered by the scope of the patent application of the present invention.

Claims

1. A planetary gearbox for a floor grinder, characterized in that: The invention comprises a housing (1), wherein a driving gear shaft (2), a first gear set (3) and a second gear set (4) are provided in the housing (1), wherein the driving gear shaft (2) passes through the top of the housing (1) and is rotatably connected thereto, wherein the first gear set (3) and the second gear set (4) are arranged opposite to each other in the upper and lower parts, wherein the second gear set (4) is respectively connected to the first gear set (3) and the driving gear shaft (2), wherein an oil lifting device (5) is provided at the lower part of the housing (1), wherein the oil lifting device (5) is connected to the first gear set (3), and wherein a grinding disc (6) is rotatably provided below the housing (1), wherein the grinding disc (6) is connected to the second gear set (4).

2. The planetary gearbox for floor grinding machine according to claim 1, characterized in that: The box body (1) comprises an upper shell (11) and a lower shell (12); the upper shell (11) is a cavity with an open bottom, and the lower shell (12) is a cavity with an open top; the upper shell (11) and the lower shell (12) are fixedly connected via an intermediate plate (13).

3. The planetary gearbox for floor grinding machine according to claim 2, characterized in that: The second gear set (4) is located in the lower housing (12), and the second gear set (4) includes at least one first driven gear (41) meshingly connected to the driving gear shaft (2), and a first rotating shaft (42) is coaxially passed through the first driven gear (41). The number of the grinding discs (6) is at least two, and a second rotating shaft (43) is coaxially passed through the grinding disc (6). A second driven gear (44) is coaxially sleeved on the second rotating shaft (43), and one of the second driven gears (44) is meshingly connected to the first driven gear (41), and the other second driven gear (44) is transmission-connected to the first driven gear (41) via an intermediate gear (45).

4. The planetary gearbox for floor grinding machine according to claim 3, characterized in that: There are two first driven gears (41) located on opposite sides of the driving gear shaft (2), and there are four second driven gears (44). Each first driven gear (41) is meshed and connected with two second driven gears (44).

5. The planetary gearbox for floor grinding machine according to claim 3, characterized in that: The first gear set (3) is located in the upper housing (11), and the first gear set (3) includes a sun gear (31). The sun gear (31) is located at the center of the upper housing (11), and the sun gear (31) is rotatably connected to the drive gear shaft (2). The outer side of the sun gear (31) is meshed with a third driven gear (32) and a fourth driven gear (33). The first rotating shaft (42) passes through the intermediate plate (13) and extends upward into the upper housing (11). The third driven gear (32) is fixedly connected to the top of the first rotating shaft (42). A fourth rotating shaft (34) is coaxially provided on the fourth driven gear (33). The fourth rotating shaft (34) passes through the intermediate plate (13) and extends into the lower housing (12). The bottom end of the fourth rotating shaft (34) is connected to the oil lifting device (5).

6. The planetary gearbox for floor grinding machine according to claim 5, characterized in that: The number of the third driven gear (32) and the number of the fourth driven gear (33) are both two, and the third driven gear (32) and the fourth driven gear (33) are arranged at intervals on the outer periphery of the sun gear (31).

7. The planetary gearbox for floor grinding machine according to claim 5, characterized in that: The oil lifting device (5) comprises a connecting shaft (51), the connecting shaft (51) being coaxially fixedly connected to the fourth rotating shaft (34), a plurality of propeller blades (52) being provided on the outer periphery of the connecting shaft (51), and the plurality of propeller blades (52) being evenly distributed along the circumference of the connecting shaft (51).

8. The planetary gearbox for floor grinding machine according to claim 7, characterized in that: The outer cover of the propeller blade (52) is provided with a connecting tube (53), and the top of the connecting tube (53) is fixedly connected to the bottom of the middle plate (13).

9. The planetary gearbox for floor grinding machine according to claim 5, characterized in that: The fourth driven gear (33) is provided with a plurality of through holes (331), the intermediate plate (13) is provided with an oil containing cavity (131), the fourth rotating shaft (34) is rotatably disposed in the oil containing cavity (131), and the oil containing cavity (131) is correspondingly provided with a plurality of through holes.

10. The planetary gearbox for floor grinding machine according to claim 2, characterized in that: The middle plate (13) is provided with an oil filling hole (132) and a plurality of oil holes (133).

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