Machine tool positioning compensation mechanism

Abstract

The utility model discloses a machine tool positioning compensation mechanism. The sliding saddle is arranged on a cross beam in a sliding mode and longitudinally reciprocates along the cross beam, a gap is formed between the sliding saddle and a guide rail face of the cross beam, two driving devices moving along with the sliding saddle are arranged on the left side end face and the right side end face of the sliding saddle respectively, and a power execution part of each driving device is connected with an inlaid strip capable of penetrating into the gap. One face of the panel is a horizontal plane attached to the guide rail face of the cross beam, the other face of the panel is a wedge-shaped inclined face, and the panel extends into the empty groove and can be driven by the driving device to advance by a certain distance to fill the abrasion gap under the condition that the guide rail face of the cross beam is abraded. The sliding saddle has the advantages that by arranging the panel extending into the empty groove and utilizing the wedge-shaped inclined surface of the panel, the gap is filled under the condition of abrasion, the sliding saddle is prevented from inclining relative to the cross beam guide rail, and the problem that the machining precision of a main shaft and the surface quality of a workpiece are influenced due to linear positioning precision errors is avoided.

Description

Technical Field

[0001] This utility model relates to CNC machine tools, and in particular to a machine tool positioning compensation mechanism. Background Technology

[0002] Currently, the positioning accuracy requirements for large CNC machine tools both domestically and internationally are becoming increasingly stringent, and users are also demanding higher levels of functionality and reliability. Among these requirements, the adjustment of the relative position between the saddle and the crossbeam of a gantry milling machine is crucial, as it directly affects the spindle's accuracy. The saddle of a gantry milling machine can reciprocate longitudinally relative to the crossbeam. During prolonged movement, excessive or uneven wear between the guide rails can lead to excessive gaps, causing the saddle to tilt relative to the crossbeam guide rails. This results in out-of-tolerance linear positioning accuracy, impacting the spindle's machining accuracy and the workpiece's surface quality.

[0003] Traditional measures to ensure the fit accuracy between the slide saddle and the crossbeam during machine tool processing include, for example... Figure 6 As shown, a strip structure is typically installed between the slide saddle and the crossbeam guide rail to adjust the clearance. Generally, the clearance between the guide rail pairs is eliminated by manually adjusting the position of the strip, and screws are used to fix it in place to maintain the adjusted state, thus ensuring the stability of the machine tool operation and machining accuracy. However, with long-term use of the machine tool, when the slide saddle and crossbeam wear down, it can only be done manually by loosening the screws and adjusting the position of the strip to adapt to the new clearance state. This process is not only cumbersome and time-consuming, but also relies on manual experience, and carries the risk of insufficient adjustment accuracy or omission of worn parts. This can easily lead to the accumulation of slide saddle positioning errors, affecting the linear accuracy and machining consistency of the machine tool, and consequently adversely affecting the surface quality of the workpiece, reducing the stability and reliability of the equipment operation. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide an effective, stable, and automatic gap-filling machine tool positioning compensation mechanism.

[0005] To solve the above-mentioned technical problems, the machine tool positioning compensation mechanism of this utility model includes a slide saddle that is slidably mounted on a crossbeam and reciprocates along the longitudinal direction of the crossbeam. There is a gap between the slide saddle and the guide rail surface of the crossbeam. Two drive devices that follow the movement of the slide saddle are respectively provided on the left and right side end faces of the slide saddle. The power execution part of each drive device is connected to a strip that can penetrate into the gap. One side of the strip is a horizontal surface that fits against the guide rail surface of the crossbeam, and the other side of the strip is a wedge-shaped inclined surface. The strip extends into the slot and can be driven by the drive device to advance a certain distance to fill the wear gap when the guide rail surface of the crossbeam is worn.

[0006] Two drive units on each side end face of the slide saddle are arranged symmetrically along the vertical center line of the crossbeam.

[0007] The slope ratio of the wedge-shaped inclined plane is 1:50.

[0008] Each of the aforementioned drive devices is fixedly mounted on the slide saddle via a bracket.

[0009] The drive device includes a cylinder with an inner cavity fixedly mounted at the bottom of the bracket, a flange for closing the inner cavity, and a piston assembly that is fitted with the cylinder. The piston assembly includes a piston located in the inner cavity and a piston rod connected to the piston and extending out of the inner cavity of the piston rod. The first end of the piston rod is connected to a strip and can drive the strip to slide under the action of the piston.

[0010] The flange sleeve is installed at the open end of the cylinder body and seals the piston inside the cavity. The piston rod extends out of the flange sleeve and an adjusting shim is provided between the flange sleeve and the piston rod.

[0011] The inner cavity is divided into an inner cavity and an outer cavity. The inner cavity is provided with an oil return hole, and the outer cavity is provided with an oil inlet hole. The piston is provided with multiple piston sealing rings for sealing with the cylinder body, and the flange is provided with a flange sealing ring for preventing leakage.

[0012] A sway bar is fixed to the end of the piston rod, and a proximity switch for detecting the running position of the sway bar is provided on the bracket.

[0013] The insert is L-shaped, and its vertical edge is connected to the head end of the drive device.

[0014] Advantages of this utility model:

[0015] (1) By setting a strip that extends into the slot and using the wedge-shaped inclined surface of the strip, the gap between the slide saddle and the crossbeam guide surface is filled in the case of wear, so as to prevent the slide saddle from tilting relative to the crossbeam guide and avoid the problem of affecting the accuracy of the spindle and the surface quality of the workpiece due to linear positioning accuracy error.

[0016] (2) The piston rod is connected to the insert to form a sliding fit. When the wear increases the clearance, the hydraulic pressure is controlled by the oil inlet hole and the oil return hole to automatically adjust the depth of the insert wedge. Under the action of hydraulic oil pressure holding and the self-locking of the insert slope, the position of the insert is fixed, thereby ensuring the relative position accuracy of the slide saddle and the crossbeam. When a gap appears between the slide saddle and the crossbeam guide surface, the gap compensation can be completed without manual inspection, which significantly improves the compensation efficiency.

[0017] (3) Each set of inserts is equipped with an induction switch to monitor its position in real time. If the insert deviates from the set range, the system will automatically issue an alarm prompt, which facilitates timely maintenance and adjustment and enhances the safety and reliability of the equipment operation. Attached Figure Description

[0018] Figure 1This is a front view of the connection between the slide saddle and the crossbeam in the machine tool positioning compensation mechanism of this utility model;

[0019] Figure 2 This is an enlarged view of the insert structure in the machine tool positioning compensation mechanism of this utility model;

[0020] Figure 3 This is a top view of the machine tool positioning compensation mechanism of this utility model;

[0021] Figure 4 This is a right view of the connection between the slide saddle and the crossbeam in the machine tool positioning compensation mechanism of this utility model;

[0022] Figure 5 This is a schematic diagram of the drive device in the machine tool positioning compensation mechanism of this utility model;

[0023] Figure 6 This is a schematic diagram of a traditional strip screw fixing structure. Detailed Implementation

[0024] The machine tool positioning compensation mechanism of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. In this embodiment, all directions are referenced from the perspective of the main view, wherein the longitudinal direction is... Figure 1 The left and right directions in the text are used to describe the relative positional relationships between the components and do not constitute a limitation on the scope of protection of this utility model. Example

[0025] This utility model's machine tool positioning compensation mechanism includes a slide saddle 1 that is slidably mounted on a crossbeam 2 and reciprocates longitudinally along the crossbeam. A groove exists between the slide saddle 1 and the guide rail surface of the crossbeam 2. Four drive devices 6 are provided on the left and right side ends of the slide saddle 1, distributed on the left and right side ends. A fixed bracket 7 is provided longitudinally on the slide saddle 1, and the slide saddle 1 is connected to the drive devices 6 via the bracket 7. The power actuation part of the drive device 6 is connected to an L-shaped insert 3 that can penetrate into the groove. The vertical edge of the insert 3 is connected to the head end of the drive device 6. The drive device 6 includes a piston assembly. 9 and a cylinder 11 with an inner cavity installed at the bottom of the bracket. The end of the cylinder 11 is provided with a flange sleeve 14 for closing the inner cavity. The piston assembly includes a piston located in the inner cavity and a piston rod connected to the piston and extending out of the inner cavity of the piston rod, and can drive the insert 3 to slide under the action of the piston. There is a groove between the slide saddle 1 and the crossbeam 2. The insert 3 extends into the groove. One side of the insert is a horizontal surface that fits against the guide rail surface of the crossbeam 2. The other side of the insert is a wedge-shaped inclined surface 5 with a slope ratio of 1:50. In the case of wear, the drive device 6 can drive the insert 3 to slide and wedge it tightly with the slide saddle in time to fill the wear gap.

[0026] Both the cylinder body 11 and the flange sleeve 14 are provided with stepped holes that slide with the stepped shaft of the piston rod 9. The flange sleeve 14 is installed at the open end of the cylinder body 11 and seals the piston inside the cavity. The piston rod 9 extends out of the flange sleeve, and an adjusting shim 15 is provided between the flange sleeve 14 and the piston rod 9. The inner cavity of the cylinder body 11 is divided into an inner cavity and an outer cavity that are isolated from each other. The inner cavity is provided with an oil return hole 13, and the outer cavity is provided with an oil inlet hole 12. The piston is provided with multiple piston sealing rings 16 for sealing with the cylinder body, and the flange sleeve 14 is provided with flange sealing rings 17 for preventing leakage. During the process, when any of the four inserts wears on the surface of the crossbeam guide rail, the hydraulic pressure is controlled by the oil inlet and return holes to automatically adjust the depth of insert wedging. The position is adjusted by the adjusting shim 15. Under the dual action of hydraulic oil pressure holding and insert inclined surface self-locking, the insert position is fixed, thus ensuring the relative position accuracy between the slide saddle and the crossbeam. A sway bar 10 is fixed to the end of the piston rod. A proximity switch 18 is set on the bracket to detect the running position of the sway bar 10. It detects whether the insert position deviates from the allowable position range. If it exceeds the range, the machine tool will alarm and make adjustments.

Claims

1. A machine tool positioning compensation mechanism, comprising a saddle (1) slidably mounted on a crossbeam (2) and reciprocating along the longitudinal direction of the crossbeam, characterized in that: A groove with a slope ratio of 1:50 is reserved between the guide rail surface of the saddle (1) and the crossbeam (2). The left and right side ends of the saddle (1) are respectively provided with two drive devices (6) that move with the saddle (1). The power execution part of each drive device (6) is connected to a strip (3) that can penetrate into the gap. One side of the strip is a horizontal surface that fits against the guide rail surface of the crossbeam (2), and the other side of the strip is a wedge-shaped inclined surface (5). The strip (3) extends into the groove and can be driven by the drive device (6) to advance a certain distance to fill the wear gap when the guide rail surface of the crossbeam is worn.

2. The machine tool positioning compensation mechanism according to claim 1, characterized in that: The two drive units (6) on each side end face of the slide saddle (1) are arranged symmetrically along the vertical center line of the crossbeam.

3. The machine tool positioning compensation mechanism according to claim 1, characterized in that: The slope ratio of the wedge-shaped inclined plane (5) is 1:

50.

4. The machine tool positioning compensation mechanism according to claim 1, characterized in that: A bracket (7) is fixedly installed on both the front and rear side surfaces of the slide saddle (1), and each of the drive devices (6) is fixedly installed on the slide saddle (1) through the bracket.

5. The machine tool positioning compensation mechanism according to claim 4, characterized in that: The drive device (6) includes a cylinder (11) with an inner cavity fixedly installed at the bottom of the bracket, a flange sleeve (14) for closing the inner cavity, and a piston rod (9) that is fitted with the cylinder (11). The piston assembly includes a piston located in the inner cavity and a piston rod connected to the piston and extending out of the inner cavity of the piston rod. The first end of the piston rod is connected to the insert (3) and can drive the insert (3) to slide under the action of the piston.

6. The machine tool positioning compensation mechanism according to claim 5, characterized in that: The flange sleeve (14) is installed at the open end of the cylinder body (11) and seals the piston in the cavity. The piston rod (9) extends out of the flange sleeve and an adjusting pad (15) is provided between the flange sleeve (14) and the piston rod (9).

7. The machine tool positioning compensation mechanism according to claim 6, characterized in that: The inner cavity is divided into an inner cavity and an outer cavity. The inner cavity is provided with an oil return hole (13) and the outer cavity is provided with an oil inlet hole (12). The piston is provided with a plurality of piston sealing rings (16) for sealing with the cylinder body. The flange sleeve (14) is provided with a flange sleeve sealing ring (17) for preventing leakage.

8. The machine tool positioning compensation mechanism according to claim 7, characterized in that: The piston rod is fixed with a sway bar (10) at the end, and the bracket is provided with a proximity switch (18) for detecting the running position of the sway bar (10).

9. The machine tool positioning compensation mechanism according to claim 1, characterized in that: The inlay (3) is L-shaped, and the vertical edge of the inlay (3) is connected to the head end of the drive device (6).

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