A roller assembly and sliding door system for a numerically controlled machine tool

Abstract

The utility model discloses a kind of roller assembly for numerical control machine tool, include: with the roller bracket and roller body of sliding door body connection, roller body is rotatably connected with roller bracket by the shaft core of being threaded, roller bracket covers the both sides of roller body, bearing is installed on shaft core, installation cavity for accommodating bearing is opened in roller body, bearing is installed on roller body by installation cavity, one end of shaft core is provided with butter nozzle, oil injection hole is opened in shaft core, oil storage cavity is opened in roller body, oil injection hole is communicated with oil storage cavity, oil storage cavity is communicated with installation cavity;By the above-mentioned mode, the utility model can be lubricated by the cooperation of one-side sealing bearing and shaft core oil injection channel, simultaneously realize disassembly-free lubrication when blocking chip invasion, significantly improve the service life and maintenance convenience of machine tool sliding door roller under harsh working conditions.

Description

Technical Field

[0001] This utility model relates to the field of CNC machine tool technology, and in particular to a roller assembly and sliding door system for CNC machine tools. Background Technology

[0002] The outer casing of CNC machine tools is usually equipped with a horizontally sliding door body to facilitate workpiece clamping, machining observation, and equipment maintenance. The opening and closing of the sliding door body depends on the smooth rolling of rollers mounted at its bottom on the track. Therefore, the reliability of the roller structure directly determines the ease of operation of the sliding door body and the continuity of machine tool use.

[0003] In existing technologies, the rollers of sliding door bodies generally adopt a basic structure consisting of rollers, built-in bearings, and mounting shafts. For example, the improved structure of a machine tool sliding door body disclosed in Chinese utility model patent CN202788480U uses a combination of hard plastic rollers and internal bearings to reduce movement noise and wear.

[0004] However, the aforementioned structure exhibits significant limitations in harsh machining environments. On one hand, the large amount of fine metal chips and dust generated during machining can easily penetrate the bearing through the assembly gap between the roller and the mounting shaft. These hard particles, mixed between the bearing balls and raceways, can cause abnormal bearing wear, eventually leading to complete jamming and rendering the sliding door unable to be pushed or pulled, directly impacting production operations.

[0005] On the other hand, the existing roller structure is inconvenient to maintain. The grease in the bearings gradually depletes and dries up over time, leading to increased rolling resistance and abnormal noise. When lubrication maintenance is required, maintenance personnel must remove the entire roller assembly from the sliding door body, a cumbersome process that extends machine downtime and increases the complexity and cost of maintenance. Utility Model Content

[0006] The first aspect of this utility model provides a roller assembly for CNC machine tools, which can achieve lubrication without disassembly while blocking the intrusion of chips through the cooperation of a single-sided sealed bearing and a shaft core oil injection channel, significantly improving the service life and maintenance convenience of the machine tool sliding door rollers under harsh working conditions.

[0007] To solve the above-mentioned technical problems, the present invention provides a roller assembly for CNC machine tools, comprising: a roller bracket and a roller body connected to a sliding door body; the roller body being rotatably connected to the roller bracket via a through-hole; the roller bracket covering both sides of the roller body; a bearing mounted on the through-hole; a mounting cavity for accommodating the bearing being formed within the roller body; the bearing being mounted on the roller body via the mounting cavity; a grease nipple being provided at one end of the through-hole; an oil injection hole being formed within the through-hole; an oil storage cavity being formed within the roller body; the oil injection hole communicating with the oil storage cavity; and the oil storage cavity communicating with the mounting cavity.

[0008] Preferably, a spacer is fitted on the shaft core, one end of which abuts against the end face of the bearing to limit the position of the bearing in the roller body. A locking screw is connected to the end of the shaft core away from the grease nipple, and the locking screw abuts against the end of the spacer away from the bearing, thereby fixing the position of the spacer on the shaft core and stabilizing the position of the bearing in the roller body.

[0009] Preferably, the end of the shaft near the grease nipple extends outward with a limiting plate that engages with one side of the roller bracket, and the end of the shaft away from the grease nipple is provided with a shaft elastic retaining ring that engages with the other side of the roller bracket, thereby limiting the position of the shaft on the roller bracket and preventing the shaft from falling off the roller bracket.

[0010] Preferably, a retaining ring for the bore is fitted into the mounting cavity, and the retaining ring abuts against one side of the bearing, thereby further restricting the position of the bearing in the mounting cavity.

[0011] Preferably, the bearing is a single-sided sealed deep groove ball bearing.

[0012] In a second aspect, the present invention provides a sliding door system for a CNC machine tool, comprising the roller assembly described above.

[0013] Preferably, the sliding door includes a sliding door body and a sliding door track. The roller assembly is installed below the sliding door body. The roller body and the sliding door track roll together. The sliding door body is fixedly connected with an anti-detachment hook. The anti-detachment hook is hooked on the edge of the sliding door track to prevent the roller body from detaching from the sliding door track. A gap is left between the sliding door track and the anti-detachment hook so as not to affect the rolling of the roller.

[0014] The beneficial effects of this invention are as follows: By combining a C-shaped roller bracket with a single-sided sealed deep groove ball bearing, an effective dual protection system is constructed. The roller bracket, acting as the first physical barrier, prevents most chips and dust from directly impacting the roller side and shaft core joint. The bearing, with its sealed side facing the contamination source, forms a second, tight line of defense, further preventing fine contaminants from entering the bearing raceway. This significantly reduces the risk of sliding door malfunctions due to chip jamming and improves operational reliability under harsh conditions. Simultaneously, the lubrication channels integrated into the shaft core and roller body, including oil injection holes and oil reservoirs, work in conjunction with grease fittings to achieve online lubrication without disassembly. Maintenance personnel can quickly replenish grease without disassembling the assembly, greatly simplifying the maintenance process and shortening machine tool downtime. Furthermore, the precise axial positioning of the bearing is achieved through the cooperation of the spacer and locking screw, ensuring smooth rotation. The bidirectional locking structure formed by the limiting plate and the elastic retaining ring on the shaft ensures reliable shaft fixing and easy assembly and disassembly. The elastic retaining ring in the mounting cavity further enhances the axial fixation of the bearing, improving the rigidity and durability of the overall structure. Finally, the inverted interlocking structure formed by the anti-disengagement hook and the sliding door track effectively prevents accidental derailment of the sliding door while maintaining rolling clearance, enhancing the safety of equipment use without affecting the smoothness of pushing and pulling. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of the roller assembly and the sliding door body of this utility model; Figure 2 This is a three-dimensional axonometric view of a half-sectional view of the roller assembly of this utility model; Figure 3 This is a schematic diagram showing the positional relationship between the roller assembly and the sliding door body of this utility model.

[0016] The components in the attached diagram are labeled as follows: 1. Sliding door body; 2. Roller bracket; 3. Roller body; 31. Mounting cavity; 32. Oil reservoir; 33. Elastic retaining ring for the hole; 4. Shaft core; 41. Oil filling hole; 42. Locking screw; 43. Limiting plate; 44. Shaft elastic retaining ring; 5. Bearings; 6. Buttered lips; 7. Spacer sleeve; 8. Sliding door track; 9. Anti-detachment hook. Detailed Implementation

[0017] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0018] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0020] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0022] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0023] Unless otherwise specified, physical quantities in formulas should be understood as basic quantities of SI base units, or derived quantities derived from basic quantities through mathematical operations such as multiplication, division, differentiation, or integration.

[0024] Example: refer to Figures 1-3 A roller assembly for CNC machine tools includes a roller bracket 2 and a roller body 3 connected to a sliding door body 1. The roller bracket 2 can be fixedly connected to the sliding door body 1 by bolts, and the roller bracket 2 can be C-shaped. The roller body 3 is rotatably connected to the roller bracket 2 through a through-hole shaft 4. The roller bracket 2 covers both sides of the roller body 3, thereby providing a certain degree of protection for the roller body 3 and effectively blocking most of the chips and dust from the machine tool processing area from directly impacting the working surface of the roller. A bearing 5 is installed on the shaft 4. The bearing 5 can be a single-sided sealed deep groove ball bearing. The roller body 3 has a mounting cavity 31 to accommodate the bearing 5. The bearing 5 is installed on the roller body 3 through the mounting cavity 31. The bottom of the mounting cavity 31 can limit and block one side of the bearing 5, thereby facilitating the installation of the bearing 5 in the mounting cavity 31. A grease nipple 6 is installed at one end of the shaft core 4. An oil injection hole 41 is provided inside the shaft core 4, and an oil reservoir 32 is provided inside the roller body 3. The oil injection hole 41 communicates with the oil reservoir 32, and the oil reservoir 32 communicates with the mounting cavity 31. Thus, the oil reservoir 32 directly leads to the internal space of the side of the deep groove ball bearing 5 without a sealing cap. When grease is injected through the grease nipple 6 using a grease gun, the grease flows sequentially through the oil injection hole 41 of the shaft core 4, the oil reservoir 32 of the roller body 3, and finally reaches the critical lubrication points between the balls and raceways of the bearing 5.

[0025] refer to Figure 1 and Figure 2 First, the C-shaped roller bracket 2 forms the first physical barrier, effectively preventing most chips and dust from the machine tool processing area from directly impacting the joint between the side of the roller body 3 and the shaft core 4. Meanwhile, the single-sided sealed deep groove ball bearing 5, with its sealing side facing the contaminant source, forms the second line of defense, further preventing any already infiltrated fine contaminants from entering the balls and raceways of the bearing 5. This combination significantly reduces the risk of the bearing 5 seizing due to chip intrusion. Secondly, the built-in lubrication channel formed by the oil filling hole 41 and the oil reservoir 32 enables online lubrication without disassembly. Maintenance personnel can quickly replenish grease through the grease fitting 6 without removing the entire roller assembly, greatly simplifying the maintenance process and reducing machine tool downtime.

[0026] refer to Figure 1 and Figure 2 A spacer 7 is fitted on the shaft core 4. One end of the spacer 7 is tightly abutted against the inner ring end face of the bearing 5 to limit the position of the bearing 5 in the roller body 3. A locking screw 42 is threadedly connected to the end of the shaft core 4 away from the grease nipple 6. The head of the locking screw 42 abuts against the end of the spacer 7 away from the bearing 5. By tightening the locking screw 42, a preload force can be applied to the spacer 7. This force is transmitted to the inner ring of the bearing 5 through the spacer 7, thereby accurately controlling the axial position of the bearing 5 in the mounting cavity 31, eliminating the internal clearance of the bearing 5, and at the same time avoiding excessive tightening that would increase the rotational resistance.

[0027] refer to Figure 1 and Figure 2 The cooperation between the spacer 7 and the locking screw 42 ensures that the bearing 5 will not move axially during operation, improving the smoothness and accuracy of the roller body 3's rotation. Furthermore, it is easy to install and adjust, effectively extending the service life of the bearing 5 and ensuring a smooth and consistent sliding feel for the sliding door body 1.

[0028] refer to Figures 1-3 To ensure the axial fixation of the roller shaft core 4 on the roller bracket 2, the shaft core 4 is designed with two-end limiting methods. Specifically, the end of the shaft core 4 closest to the grease nipple 6 extends outward with a limiting plate 43 that engages with one side of the roller bracket 2. Thus, when the shaft core 4 passes through the roller bracket 2, one end of the shaft core 4 is in contact with the outer surface of one side of the roller bracket 2 through the limiting plate 43. The end of the shaft core 4 away from the grease nipple 6 has an annular groove, through which a shaft elastic retaining ring 44 that engages with the other outer surface of the roller bracket 2 is engaged. Through the clamping of the limiting plate 43 and the shaft elastic retaining ring 44 on both sides, the roller shaft core 4 is firmly restricted on the roller bracket 2 and cannot move axially, while not affecting the free rotation of the roller body 3 around the shaft core 4.

[0029] refer to Figures 1-3The limiting plate 43 and the elastic retaining ring 44 securely lock the shaft core 4 in both directions, completely preventing the shaft core 4 from loosening or coming out during operation, thus ensuring the structural integrity and safety of the entire roller assembly. Furthermore, this structure is easy to assemble and disassemble; simply installing or removing the elastic retaining ring is sufficient to fix or release the shaft core 4, facilitating future maintenance.

[0030] refer to Figure 1 and Figure 2 To further constrain the position of bearing 5 within the mounting cavity 31 of roller body 3 and prevent axial displacement, an annular groove is machined at the open end of mounting cavity 31. A retaining ring 33 for the bore is fitted into mounting cavity 31, with its inner surface directly contacting the outer end face of bearing 5. The retaining ring 33 and the bottom of mounting cavity 31 work together to clamp bearing 5 from both sides, achieving complete radial positioning of bearing 5.

[0031] refer to Figure 1 and Figure 2 The elastic retaining ring 33 provides a cost-effective and efficient axial fixation for the bearing 5. Together with the stepped surface at the bottom of the mounting cavity 31, the elastic retaining ring 33 forms a closed bearing 5 housing, ensuring that the bearing 5 will not come out of the mounting cavity 31 when operating at high speed or subjected to impact loads. This greatly enhances the rigidity and durability of the roller assembly structure, making operation more stable and reliable.

[0032] refer to Figures 1-3 This utility model also discloses a sliding door system for CNC machine tools, including the roller assembly described above. The sliding door system also includes a sliding door body 1 and a sliding door track 8. The roller assembly is installed at the bottom of the sliding door body 1. The roller body 3 rolls in cooperation with the sliding door track 8. The roller body 3 is stably supported on the sliding door track 8 and rolls along the sliding door track 8. To ensure safety, the sliding door body 1 is fixedly connected with an anti-disengagement hook 9. The anti-disengagement hook 9 naturally hooks onto the outer edge of the sliding door track 8 from above, forming an inverted structure to prevent the roller body 3 from disengaging from the sliding door track 8. Sufficient gap is maintained between the inner side of the anti-disengagement hook 9 and the sliding door track 8. This gap ensures that the roller body 3 can roll freely without obstruction, and when the sliding door body 1 is subjected to abnormal upward external force, the interference between the anti-disengagement hook 9 and the sliding door track 8 effectively prevents the risk of the roller body 3 jumping out of the sliding door track 8. This provides a passive safety protection without interfering with the normal pushing, pulling, and sliding of the sliding door body 1, effectively preventing accidental derailment of the sliding door body 1 due to improper operation or vibration, thus enhancing the safety of equipment use. At the same time, the structure is simple, requires no additional operation, and has high reliability.

[0033] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A roller assembly for a CNC machine tool, characterized in that, include: A roller bracket (2) and a roller body (3) are connected to the sliding door body (1). The roller body (3) is rotatably connected to the roller bracket (2) through a through shaft (4). The roller bracket (2) covers both sides of the roller body (3). A bearing (5) is installed on the shaft (4). An installation cavity (31) for accommodating the bearing (5) is opened in the roller body (3). The bearing (5) is installed on the roller body (3) through the installation cavity (31). A grease nipple (6) is provided at one end of the shaft (4). An oil injection hole (41) is opened in the shaft (4). An oil storage cavity (32) is opened in the roller body (3). The oil injection hole (41) communicates with the oil storage cavity (32). The oil storage cavity (32) communicates with the installation cavity (31).

2. The roller assembly for a CNC machine tool according to claim 1, characterized in that: A spacer (7) is fitted on the shaft core (4). One end of the spacer (7) abuts against the end face of the bearing (5) to limit the position of the bearing (5) in the roller body (3). A locking screw (42) is connected to the end of the shaft core (4) away from the grease nipple (6). The locking screw (42) abuts against the end of the spacer (7) away from the bearing (5), thereby fixing the position of the spacer (7) on the shaft core (4) and stabilizing the position of the bearing (5) in the roller body (3).

3. A roller assembly for a CNC machine tool according to claim 2, characterized in that: The end of the shaft core (4) near the grease nipple (6) extends outward with a limiting plate (43) that is matched with one side of the roller bracket (2). The end of the shaft core (4) away from the grease nipple (6) is provided with a shaft elastic retaining ring (44) that is matched with the other side of the roller bracket (2), thereby limiting the position of the shaft core (4) on the roller bracket (2) and preventing the shaft core (4) from falling off the roller bracket (2).

4. A roller assembly for a CNC machine tool according to claim 3, characterized in that: An elastic retaining ring (33) for holes is fitted in the mounting cavity (31). The elastic retaining ring (33) for holes abuts against one side of the bearing (5), thereby further restricting the position of the bearing (5) in the mounting cavity (31).

5. A roller assembly for a CNC machine tool according to claim 1, characterized in that: The bearing (5) is a single-sided sealed deep groove ball bearing (5).

6. A sliding door system for CNC machine tools, characterized in that: Includes the roller assembly as described in any one of claims 1-5.

7. A sliding door system for CNC machine tools according to claim 6, characterized in that: The sliding door includes a sliding door body (1) and a sliding door track (8). The roller assembly is installed below the sliding door body (1). The roller body (3) rolls with the sliding door track (8). The sliding door body (1) is fixedly connected with an anti-disengagement hook (9). The anti-disengagement hook (9) is hooked on the edge of the sliding door track (8) to prevent the roller body (3) from disengaging from the sliding door track (8). There is a gap between the sliding door track (8) and the anti-disengagement hook (9) so as not to affect the rolling of the roller.

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