Static pressure device for linear movement of machine tool
By adopting a structure combining a static pressure plate and a stepped shaft on the machine tool guide rail, and using hydraulic oil to maintain constant pressure to push the static pressure plate, the problem of backlash failure caused by the wear of the inserts is solved, and the long-term stability and high-precision machining of the guide rail are achieved.
Patent Information
- Application Number
- CN202423280126.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2034-12-30
AI Technical Summary
Existing machine tool guideways that utilize the beveled surface of the insert for backlash elimination are difficult to maintain long-term stability, which can easily lead to wear of the insert and failure of the backlash elimination method.
The structure adopts a combination of static pressure plate and stepped shaft. Hydraulic oil maintains constant pressure in the gap between static pressure plate and stepped shaft, pushing the static pressure plate to continuously clamp the guide rail and eliminate the gap.
It ensures no gap between the guide rail and the static pressure plate, maintains the machining accuracy of the machine tool, and has a simple structure and low modification cost.
Smart Images
Figure CN223820088U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a linear motion static pressure device for machine tools. Background Technology
[0002] Existing machine tool guideways use inserts to eliminate backlash, such as... Figure 3 As shown, it uses the inclined surfaces of the strips on both sides of the guide rail to eliminate the gap. This fixed gap elimination method is difficult to maintain stability for a long time, and as the guide rail moves back and forth, the strips will wear down, causing the gap elimination to fail and resulting in unstable transmission. Utility Model Content
[0003] The purpose of this utility model is to provide a hydrostatic device for linear motion of machine tools, which solves the problem that existing machine tool guideways using the inclined surface of the insert for gap elimination are difficult to maintain long-term stability, and are prone to wear of the insert, causing gap elimination to fail.
[0004] To solve the above problems, the technical solution of this utility model is as follows:
[0005] A linear motion hydrostatic device for a machine tool includes a bed, a guide rail inside the bed, and hydrostatic plates on both sides of the guide rail. Multiple through holes are opened on one side of the hydrostatic plates on the bed, and a loading mechanism is installed in each through hole. The loading mechanism includes a stepped shaft fixedly connected in the through hole. A ring is sleeved on the thinner end of the stepped shaft, and one end of the ring is fixedly connected to the hydrostatic plate. A main oil passage is provided inside the stepped shaft, with the outlet of the main oil passage facing the hydrostatic plate and the inlet of the main oil passage connected to a hydraulic source.
[0006] An oil distribution channel is provided inside the stepped shaft. One end of the oil distribution channel is connected to the main oil channel, and the other end is connected to the oil tank of the hydraulic power source through an overflow valve.
[0007] The overflow valve is an adjustable overflow valve.
[0008] When the other end of the ring abuts against the stepped surface of the stepped shaft, there is a gap of 0.5~2mm between the static pressure plate and the stepped shaft.
[0009] The beneficial effects of this utility model are as follows: the hydraulic source sends hydraulic oil into the gap between the static pressure plate and the stepped shaft, and keeps the hydraulic oil in the gap at a constant pressure. The constant pressure hydraulic oil pushes the static pressure plate to continuously clamp the guide rail to eliminate the gap. Even if the static pressure plate wears, it can ensure that there is no gap between the guide rail and the static pressure plate, ensuring that the machine tool can continuously maintain high machining accuracy. Moreover, the device has a simple structure and low modification cost. Attached Figure Description
[0010] The present invention will be further described below with reference to the accompanying drawings:
[0011] Figure 1 This is a cross-sectional structural diagram of the present invention.
[0012] Figure 2 for Figure 1 A schematic diagram of the structure at point AA.
[0013] Figure 3 This is a cross-sectional schematic diagram of an existing machine tool guideway backlash elimination structure.
[0014] In the diagram: 1. Guide rail; 2. Static pressure plate; 3. Ring sleeve; 4. Bed; 5. Stepped shaft; 6. Quick connector; 7. Overflow valve; 8. Main oil passage. Detailed Implementation
[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0016] like Figure 1 and 2 As shown, a linear motion hydrostatic device for a machine tool includes a bed 4, a guide rail 1 inside the bed 4, and hydrostatic plates 2 on both sides of the guide rail 1. The hydrostatic plates 2 are relative to the inserts in existing machine tools. Multiple through holes are opened on one side of the bed 4 of the hydrostatic plates 2. A loading mechanism is provided in the through holes. The loading mechanism includes a stepped shaft 5 fixedly connected in the through holes. A ring sleeve 3 is sleeved on the thinner end of the stepped shaft 5. One end of the ring sleeve 3 is fixedly connected to the hydrostatic plate 2. A main oil passage 8 is provided in the stepped shaft. The outlet of the main oil passage 8 faces the hydrostatic plate 2. The inlet of the main oil passage 8 is connected to a hydraulic source (not shown in the figure) through a quick connector 6.
[0017] The hydraulic power source pumps hydraulic oil at a pressure of 4 MPa into the main oil passage 8. The hydraulic oil enters the gap between the static pressure plate 2 and the stepped shaft 5 along the main oil passage 8. The constant pressure hydraulic oil pushes the static pressure plate 2 to continuously clamp the guide rail 1 to eliminate the gap.
[0018] An oil distribution channel is provided inside the stepped shaft 5. One end of the distribution channel is connected to the main oil channel 8, and the other end is connected to the oil tank in the hydraulic power source through an adjustable relief valve 7. Through the relief valve 7, the hydraulic oil pressure in the gap between the static pressure plate 2 and the stepped shaft 5 is maintained at 4 MPa, and the pressure is adjustable.
[0019] When the other end of the ring 3 abuts against the stepped surface of the stepped shaft 5, there is a 1mm gap between the static pressure plate 2 and the stepped shaft 5. This gap ensures that the hydraulic oil has sufficient working area to apply force to the static pressure plate 2.
[0020] The embodiments described in this specification are merely examples of implementations of the inventive concept. The scope of protection of this utility model should not be considered as limited to the specific forms described in the embodiments. The scope of protection of this utility model also extends to equivalent technical means that can be conceived by those skilled in the art based on the inventive concept.
Claims
1. A linear motion hydrostatic device for a machine tool, comprising a bed (4), wherein a guide rail (1) is provided inside the bed (4), characterized in that: The guide rail (1) is provided with static pressure plates (2) on both sides. Multiple through holes are provided on the bed (4) on one side of the static pressure plate (2). A loading mechanism is provided in the through hole. The loading mechanism includes a stepped shaft (5) fixedly connected in the through hole. A ring sleeve (3) is sleeved on the thinner end of the stepped shaft (5). One end of the ring sleeve (3) is fixedly connected to the static pressure plate (2). A main oil passage (8) is provided in the stepped shaft (5). The outlet of the main oil passage (8) faces the static pressure plate (2). The inlet of the main oil passage (8) is connected to the hydraulic source.
2. The linear motion hydrostatic device for machine tools according to claim 1, characterized in that: An oil distribution channel is provided inside the stepped shaft (5). One end of the oil distribution channel is connected to the main oil channel (8), and the other end is connected to the oil tank of the hydraulic power source through the overflow valve (7).
3. The linear motion hydrostatic device for machine tools according to claim 2, characterized in that: The overflow valve (7) is an adjustable overflow valve (7).
4. A linear motion hydrostatic device for machine tools according to claim 1, 2, or 3, characterized in that: When the other end of the ring (3) abuts against the stepped surface of the stepped shaft (5), there is a gap of 0.5~2mm between the static pressure plate (2) and the stepped shaft (5).