A pavement milling cutter rotation transmission mechanism

Abstract

The utility model discloses a kind of road surface milling cutter rotary transmission mechanism, belong to road surface milling mechanical technical field.The mechanism includes milling assembly outer shell, drive part, milling cutter mounting sleeve, fixed position, bearing support sleeve seat and transmission shaft.Milling cutter mounting sleeve is located in outer shell, its peripheral surface is used to install milling cutter;Fixed position is located in the non-end position inside mounting sleeve, for installing transmission shaft one end;Bearing support sleeve seat is located between fixed position and drive part and is fixedly connected with outer shell;Transmission shaft is located in bearing support sleeve seat, is rotatably connected with it by at least one bearing located in the inside of milling cutter mounting sleeve, transmission shaft one end is connected with fixed position, the other end connects drive part.The utility model passes through the bearing support sleeve seat structure of stretching into the inside of milling cutter mounting sleeve to support the rotation of transmission shaft, effectively reduces bearing load and transmission shaft stress concentration, improves transmission stability and service life, compact structure simultaneously, it is convenient for peripheral component arrangement.

Description

Technical Field

[0001] This utility model relates to the field of road milling machinery technology, specifically to a road milling cutter rotary transmission mechanism. Background Technology

[0002] In road milling operations, the rotary transmission mechanism of the milling cutter is the core component of the milling machine. During operation, it is subjected to strong impact loads, thus requiring high standards for the support bearings and shafts.

[0003] In existing rotary transmission mechanisms for milling cutters, a common approach is to place the support bearings of the milling cutter on both sides, as in the transmission structure of the road milling machine disclosed in patent document CN112942038A. However, in this structure, the bearing housings and other structures located at the opposite end of the drive source need to be placed on the outside of the milling cutter's outer casing, occupying a large amount of space and potentially obstructing the arrangement of peripheral working components. Another approach, especially when used with small-width milling cutters, requires two bearing supports on one side of the milling cutter for easier tool changes or better edge contact, i.e., "cantilever support," as in the trench milling equipment disclosed in patent document CN118407482A. However, this cantilever support method has the problems of higher impact loads on the bearings, making them more susceptible to damage, and stress concentration at the connection between the support shaft and the milling cutter, leading to breakage. It also occupies a large amount of space and obstructs the arrangement of peripheral working components.

[0004] Therefore, there is an urgent need for a road milling cutter rotary transmission mechanism that can reduce bearing load and has a more compact arrangement of structural components. Utility Model Content

[0005] This utility model provides a road milling cutter rotary transmission mechanism to address the aforementioned problems existing in the prior art.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A road milling cutter rotary transmission mechanism, used to connect a drive unit and a milling cutter to realize the rotary drive of the milling cutter by the drive unit, comprising a milling assembly outer shell, the drive unit being located on one side of the milling assembly outer shell, characterized in that it further comprises... A milling cutter mounting sleeve is disposed inside the outer shell of the milling assembly and has open ends for mounting a milling cutter through its circumferential surface. The end of the milling cutter mounting sleeve facing the drive unit is open, and the milling cutter mounting sleeve has a receiving cavity inside, which communicates with the opening along the axial direction of the milling cutter mounting sleeve. A drive shaft is disposed within the receiving cavity. One end of the drive shaft is connected and fixed to a fixing position on the milling cutter mounting sleeve via a connecting medium, and the other end extends outward as a connecting end for connecting to the drive unit. A bearing support sleeve is disposed within the receiving cavity and sleeved on the outside of the drive shaft. The bearing support sleeve extends outward and is fixedly connected to the outer shell of the milling assembly. The drive shaft is rotatably connected to the inner wall of the bearing support sleeve via bearings, and at least one of the bearings is located inside the milling cutter mounting sleeve.

[0007] Furthermore, the fixing position is fixedly disposed inside the milling cutter mounting sleeve or at one end away from the drive unit, so that the end of the milling cutter mounting sleeve facing the drive unit forms a concave structure, forming the receiving cavity.

[0008] Furthermore, the fixing position is located at the center of the milling cutter mounting sleeve, offset from the drive unit.

[0009] Furthermore, the connecting medium is a connecting flange.

[0010] Furthermore, a preset gap is left between the bearing support sleeve and the milling cutter mounting sleeve 7.

[0011] Furthermore, a seal is provided between the bearing support sleeve and the milling cutter mounting sleeve, and the seal is preferably located at the end of the milling cutter mounting sleeve.

[0012] Furthermore, the milling cutter is a multi-piece assembled milling cutter arranged along the axial direction of the milling cutter mounting sleeve, and each milling cutter is detachably fixedly connected to the milling cutter mounting sleeve.

[0013] Furthermore, the end of the milling cutter mounting sleeve near the drive unit is provided with a top stop protruding from its circumference, and the end of the milling cutter mounting sleeve away from the drive unit is provided with a retaining ring protruding from its circumference. The retaining ring and the top stop are located on both ends of the milling cutter, respectively, and are used to limit the outermost milling cutter.

[0014] Furthermore, the retaining ring is detachably connected to the milling cutter mounting sleeve, the milling cutter mounting sleeve has a groove on its circumference, and the retaining ring has a split structure, with its inner end inserted into the groove.

[0015] Furthermore, the outer side of the retaining ring is provided with a bolt for radial limiting, and the surface of the outermost milling cutter is provided with a fixing hole that matches the bolt. The bolt is threadedly connected to the outermost milling cutter, and the end of the bolt can pass through the fixing hole and abut against the next outermost milling cutter.

[0016] The beneficial effects of this utility model are as follows: Based on the existing cantilever support transmission mechanism, this utility model sets up a bearing support sleeve that extends into the internal cavity of the milling cutter mounting sleeve and is fixed to the outer shell of the milling assembly. The transmission shaft extends into the bearing support sleeve and one end is fixedly installed in the fixed position inside the milling cutter mounting sleeve. The outside of the transmission shaft is rotatably connected to the bearing support sleeve through a bearing. In this structure, at least one bearing is located inside the milling cutter mounting sleeve, which can greatly reduce the impact load of the road milling cutter rotation on the bearing and reduce the phenomenon of easy breakage of the transmission shaft in the connection section between the bearing and the milling cutter due to large loads, stress concentration. In addition, the structure design is more reasonable and compact, avoiding the occupation of a large space on the outside of the milling cutter housing and reducing the impact on the layout of the peripheral mechanism. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the external structure of an embodiment of the present invention; Figure 2 This is a three-dimensional structural diagram of an embodiment of the present invention (excluding the outer shell of the milling component); Figure 3 yes Figure 1 A schematic diagram of the cross-sectional structure; Figure 4 yes Figure 3 A magnified view of a portion of the image; Figure 5 This is a partial structural schematic diagram of a milling cutter mounting sleeve according to an embodiment of the present invention; Figure 6 yes Figure 2 A magnified view of a portion of the image; In the figure: 1. Outer housing of milling assembly, 2. Drive unit, 3. Milling cutter, 31. Fixing hole, 4. Bearing support sleeve, 5. Drive shaft, 51. Connecting flange, 6. Bearing, 7. Milling cutter mounting sleeve, 71. Fixing position, 72. Top stop, 73. Retaining ring, 74. Slot, 8. Seal, 9. Bolt, 10. Dustproof end cover. Detailed Implementation

[0018] The principles and features of this utility model are described below. The embodiments given are only used to explain this utility model and are not intended to limit the scope of this utility model.

[0019] This embodiment provides a road milling cutter rotation transmission mechanism as shown in the attached figure, used to connect the drive unit 2 and the milling cutter 3, realizing the rotational drive of the milling cutter 3 by the drive unit 2. The drive unit 2 can adopt existing technical structures such as hydraulic motors and electric motors. The mechanism includes a milling assembly outer shell 1, a milling cutter mounting sleeve 7, a fixing position 71, a bearing support sleeve 4, a transmission shaft 5, and related connecting and sealing components.

[0020] The outer casing 1 of the milling assembly is an integral support structure, with the drive unit 2 mounted on one side. A milling cutter mounting sleeve 7 is disposed inside the outer casing 1, with an open end facing the drive unit 2. The milling cutter mounting sleeve 7 has a receiving cavity that communicates with the opening along the axial direction of the sleeve. Multiple detachable, assembled milling cutters 3 are axially mounted on the circumferential surface of the sleeve 7. The mounting structure of the milling cutters on the sleeve 7 is existing technology and will not be described further here. Correspondingly, a top stop 72 protruding from its circumferential surface is provided at the end of the milling cutter mounting sleeve 7 near the drive unit 2, and a retaining ring 73 protruding from its circumferential surface is provided at the end of the sleeve 7 away from the drive unit 2. The retaining ring 73 and the top stop 72 are located at opposite ends of the milling cutters 3, respectively, and are used to limit the movement of the outermost milling cutter 3.

[0021] The milling cutter mounting sleeve 7 has a fixing position 71 inside for mounting one end of the drive shaft 5. The fixing position 71 is located inside the milling cutter mounting sleeve 7 or at its end furthest from the drive unit, preferably positioned at a point off-center from the drive unit 2. (See [reference]). Figure 5 As shown. The drive shaft 5 is disposed in the receiving cavity, one end of which is fixed to the fixing position 71 by bolts through the connecting flange 51, and the other end extends outward as a connecting end for connecting the drive unit 2.

[0022] The bearing support sleeve 4 is disposed in the receiving cavity and sleeved on the outside of the drive shaft 5. The bearing support sleeve 4 has a certain length, with one end extending inward close to the connecting flange 51 and the other end extending outward and fixedly connected to the outer shell 1 of the milling assembly. A certain gap is maintained between the bearing support sleeve 4 and the milling cutter mounting sleeve 7, and a sealing element 8 is provided at the end of the milling cutter mounting sleeve 7 to prevent dust and other impurities from entering the gap.

[0023] The drive shaft 5 is rotatably connected to the inner wall of the bearing support sleeve 4 via bearings 6, and at least one bearing 6 is located inside the milling cutter mounting sleeve 7. In this embodiment, two bearings are used, and an appropriate distance is left between the two bearings 6, with one bearing close to the connecting flange 51 and the other bearing close to the outer end of the bearing support sleeve 4, to enhance the support rigidity and transmission stability.

[0024] The working principle of this embodiment is as follows: The drive unit 2 drives the milling cutter mounting sleeve 7 to rotate via the drive shaft 5, thereby driving the multiple milling cutters 3 mounted on it to perform milling operations. The drive shaft 5 is rotatably connected to the bearing support sleeve 4 through at least one bearing located inside the milling cutter mounting sleeve 7, making the support point of the drive shaft 5 closer to the stress area of ​​the milling cutter, significantly reducing the bending moment of the cantilever section of the drive shaft and the bearing load, and improving the durability and stability of the overall structure. At the same time, the concave design of the milling cutter mounting sleeve 7 makes the overall structure more compact, avoiding the occupation of a large space on the outside of the milling cutter housing and reducing the impact on the layout of the peripheral mechanisms.

[0025] Based on the above embodiments, in order to facilitate quick replacement of the milling cutter (via the opposite end of the drive unit), in a preferred embodiment of this utility model, the retaining ring 73 is detachably connected to the milling cutter mounting sleeve 7. Specifically, a groove 74 is provided on the circumferential surface of the milling cutter mounting sleeve 7, and the retaining ring 73 has a split structure. In this embodiment, the retaining ring 73 has a two-part structure. See Figure 6 As shown, its inner end is inserted into the slot 74. Figure 4 As shown. During assembly, simply insert the two retaining rings into the slots 74 respectively.

[0026] To further limit the movement of the retaining ring, in a preferred embodiment of this invention, a bolt 9 for radial limiting is provided on the outer side of the retaining ring 73, see [link to relevant documentation]. Figure 4 As shown, bolt 9 is close to the outer edge of retaining ring 73; the outermost milling cutter 3 has multiple fixing holes 31 (threaded holes) adapted to bolt 9 on its surface. Bolt 9 is threadedly connected to the outermost milling cutter, and the end of bolt 9 can pass through the fixing hole 31 and abut against the next outermost milling cutter. During assembly, the milling cutters are first arranged on the milling cutter mounting sleeve 7 and fixed (as per existing technology). Then, bolt 9 is screwed into the fixing hole 31 until its end passes through the fixing hole 31 and abuts against the surface of the next outermost milling cutter, achieving a tightening effect and simultaneously completing the radial fixation of retaining ring 73.

Claims

1. A road milling cutter rotary transmission mechanism for connecting a drive unit (2) and a milling cutter (3) to achieve rotary drive of the milling cutter (3) by the drive unit (2), comprising a milling assembly outer shell (1), wherein the drive unit (2) is located on one side of the milling assembly outer shell (1), characterized in that, Also includes The milling cutter mounting sleeve (7) is set inside the outer shell (1) of the milling assembly and has open ends for mounting milling cutters (3) through its circumferential surface. The end of the milling cutter mounting sleeve (7) facing the drive unit (2) is open, and the milling cutter mounting sleeve (7) has a receiving cavity inside. The receiving cavity communicates with the opening along the axial direction of the milling cutter mounting sleeve (7). A drive shaft (5) is disposed within the receiving cavity. One end of the shaft is connected and fixed to the fixing position (71) on the milling cutter mounting sleeve (7) via a connecting medium, and the other end extends outward as a connecting end for connecting the drive unit (2). The bearing support sleeve (4) is set in the cavity and sleeved on the outside of the drive shaft (5). The bearing support sleeve (4) extends outward and is fixedly connected to the outer shell (1) of the milling assembly. The drive shaft (5) is rotatably connected to the inner wall of the bearing support sleeve (4) via a bearing (6), and at least one of the bearings (6) is located inside the milling cutter mounting sleeve (7).

2. The road milling cutter rotary transmission mechanism according to claim 1, characterized in that, The fixing position (71) is fixedly disposed inside the milling cutter mounting sleeve (7) or at one end away from the drive unit.

3. The road milling cutter rotary transmission mechanism according to claim 2, characterized in that, The fixing position (71) is located at the center of the milling cutter mounting sleeve (7) off from the drive part (2).

4. The road milling cutter rotary transmission mechanism according to claim 1, characterized in that, The connecting medium is a connecting flange (51).

5. The road milling cutter rotary transmission mechanism according to claim 1, characterized in that, A preset gap is left between the bearing support sleeve (4) and the milling cutter mounting sleeve (7).

6. The road milling cutter rotary transmission mechanism according to claim 5, characterized in that, A seal (8) is provided between the bearing support sleeve (4) and the milling cutter mounting sleeve (7).

7. The road milling cutter rotary transmission mechanism according to claim 1, characterized in that, The milling cutter (3) consists of multiple assembled milling cutters (3) arranged along the axial direction of the milling cutter mounting sleeve (7). Each milling cutter (3) is detachably fixedly connected to the milling cutter mounting sleeve (7).

8. The road milling cutter rotary transmission mechanism according to claim 7, characterized in that, The milling cutter mounting sleeve (7) has a top stop (72) protruding from its circumference at one end near the drive unit (2), and a retaining ring (73) protruding from its circumference at the other end away from the drive unit (2). The retaining ring (73) and the top stop (72) are located at both ends of the milling cutter (3) and are used to limit the outermost milling cutter (3).

9. The road milling cutter rotary transmission mechanism according to claim 8, characterized in that, The retaining ring (73) is detachably connected to the milling cutter mounting sleeve (7). The milling cutter mounting sleeve (7) has a slot (74) on its circumference. The retaining ring (73) has a split structure, and its inner end is inserted into the slot (74).

10. The road milling cutter rotary transmission mechanism according to claim 9, characterized in that, The outer side of the retaining ring (73) is provided with a bolt (9) for radial positioning. The surface of the outermost milling cutter (3) is provided with a fixing hole that matches the bolt (9). The bolt (9) is threadedly connected to the outermost milling cutter, and the end of the bolt (9) can pass through the fixing hole and abut against the next outermost milling cutter.

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