Hydrostatic guideway structure

Abstract

The utility model discloses a static pressure guide rail structure which comprises a gland, a sliding seat and a ram located between the sliding seat and the gland, and further comprises a guide rail plate assembly and an oil way assembly, the guide rail plate assembly is fixed on the sliding seat and the inner wall of the gland, and the guide rail plate assembly is provided with a plurality of static pressure cavities. The oil way assembly comprises a motor, a gear pump and an oil way, the motor drives the gear pump to suck static pressure oil into the oil way, the static pressure oil is injected into the multiple static pressure cavities through the oil way, a static pressure oil film is formed, and the ram floats. According to the motor-driven gear pump, static pressure oil is sucked into an oil way through the oil suction filter and injected into a static pressure cavity in the guide rail plate assembly through the oil distribution pipe, a static pressure oil film is formed, the ram floats, and the ram moves up and down in the sliding seat. The hydrostatic guideway structure enables the ram not to be in direct contact with the sliding seat and the gland, and has the advantages of being low in friction coefficient, good in dynamic characteristic, high in precision, good in anti-vibration performance and large in bearing capacity.

Description

Technical Field

[0001] This utility model relates to the field of hydrostatic guide rail technology, and in particular to a hydrostatic guide rail structure. Background Technology

[0002] In today's machine tool industry, the guideways of machine tools such as vertical lathes and vertical turning centers use either linear guideway structures or sliding guideway structures. Linear guideway structures suffer from poor vibration resistance and low load-bearing capacity; sliding guideway structures experience high friction, low sensitivity, weak dynamic performance, and low precision. Therefore, a new type of guideway structure for vertical lathes is urgently needed. Summary of the Invention

[0003] In order to overcome the shortcomings of the existing technology, the purpose of this utility model is to realize a hydrostatic guide rail structure with low friction, high precision, good seismic performance and high load-bearing capacity.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] A hydrostatic guide rail structure includes a pressure cover, a slide block, and a slide block located between the slide block and the pressure cover. The hydrostatic guide rail structure also includes a guide rail plate assembly and an oil circuit assembly. The guide rail plate assembly is fixed to the inner wall of the slide block and the pressure cover. The guide rail plate assembly has multiple hydrostatic chambers. The oil circuit assembly includes a motor, a gear pump, and an oil circuit. The motor drives the gear pump to draw hydrostatic oil into the oil circuit. The hydrostatic oil is injected into the multiple hydrostatic chambers through the oil circuit to form a hydrostatic oil film, causing the slide block to float.

[0006] Preferably, the guide rail assembly includes multiple guide rails and multiple inserts, the static pressure cavity is located within the guide rails and the inserts, and the multiple guide rails and the multiple inserts are respectively located at the four corners of the slide and the pressure cover.

[0007] Preferably, the size of the insert gradually increases from the inside to the outside.

[0008] Preferably, the pressure cover includes an upper pressure cover, a middle pressure cover, and a lower pressure cover. The upper pressure cover, the middle pressure cover, and the lower pressure cover are threadedly connected to the slide block, and part of the guide rail plate assembly is located on the upper pressure cover and the lower pressure cover.

[0009] Preferably, the oil circuit assembly further includes an oil suction filter, which is located on the oil circuit and before the gear pump.

[0010] Preferably, the oil circuit assembly further includes an overflow valve, a pressure damper, and an oil pressure gauge, wherein the overflow valve, the pressure damper, and the oil pressure gauge are located on the oil circuit.

[0011] Preferably, the oil circuit assembly further includes a filter, multiple oil distribution pipes, and capillary damping pipes that are matched with each of them. The filter is located on the oil circuit and between the oil circuit and the multiple oil distribution pipes. The multiple oil distribution pipes are formed by branches of the oil circuit. The oil distribution pipes are connected to the static pressure chamber through the capillary damping pipes.

[0012] Preferably, the oil pressure gauge is located on the oil distribution pipe.

[0013] Preferably, the number of static pressure chambers is 16.

[0014] Preferably, the number of capillary damping tubes is equal to the number of static pressure chambers.

[0015] Compared with existing technologies, the hydrostatic guide rail structure of this utility model has the following advantages:

[0016] This application's hydrostatic guide rail structure utilizes a motor-driven gear pump to draw hydrostatic oil into the oil circuit through an oil suction filter. The oil is then injected into the hydrostatic chamber of the guide rail assembly via a distributor pipe, forming a hydrostatic oil film that lifts the ram, allowing it to move up and down within the slide block. This hydrostatic guide rail structure prevents direct contact between the ram, slide block, and pressure cap, resulting in advantages such as a low coefficient of friction, high guide rail pair sensitivity, good dynamic characteristics, high precision, good vibration resistance, and high load-bearing capacity. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the hydrostatic guide rail structure of this application;

[0018] Figure 2 for Figure 1 A cross-sectional view of the hydrostatic guide rail structure;

[0019] Figure 3 for Figure 1 A schematic diagram of the guide rail plate assembly and slide block structure of the hydrostatic guide rail structure;

[0020] Figure 4 for Figure 3 A cross-sectional view of the guide rail plate and the slide block;

[0021] Figure 5 for Figure 3 A cross-sectional view of the insert and the slide block;

[0022] Figure 6 for Figure 5 A schematic diagram of the inlay structure;

[0023] Figure 7 This is a schematic diagram of the oil circuit assembly of this application.

[0024] In the diagram: 100, pressure cap; 101, upper pressure cap; 102, middle pressure cap; 103, lower pressure cap; 200, slide block; 300, slide ram; 400, guide rail plate assembly; 401, guide rail plate; 402, insert; 500, oil circuit assembly; 501, oil suction filter; 502, motor; 503, gear pump; 504, overflow valve; 505, pressure buffer; 506, oil pressure gauge; 507, filter; 508, capillary damping tube; 509, level switch; 510, oil circuit; 511, oil distribution pipe. Detailed Implementation

[0025] 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.

[0026] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or it can be fixed through another intermediate component. When a component is said to be "connected to" another component, it can be directly connected to the other component or it may be fixed through another intermediate component. When a component is said to be "set on" another component, it can be set directly on the other component or it may be set through another intermediate component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] Figures 1-7 The present invention provides a hydrostatic guide rail structure, including a pressure cover 100, a slide 200, and a slide ram 300 located between the slide 200 and the pressure cover 100. The hydrostatic guide rail structure also includes a guide rail plate assembly 400 and an oil circuit assembly 500. The guide rail plate assembly 400 is located on the inner wall of the slide 200 and the pressure cover 100. The guide rail plate assembly 400 is provided with multiple hydrostatic chambers. Hydrostatic oil is injected into the multiple hydrostatic chambers through the oil circuit assembly 500 to form a hydrostatic oil film, causing the slide ram 300 to float.

[0029] like Figure 1As shown, the pressure cover 100 includes an upper pressure cover 101, a middle pressure cover 102, and a lower pressure cover 103. The upper pressure cover 101, the middle pressure cover 102, and the lower pressure cover 103 are threadedly connected to the slide block 200. Part of the guide rail plate assembly 400 is located on the upper pressure cover 101 and the lower pressure cover 103. The pressure cover 100 plays an important role in connection and fixation.

[0030] Specifically, the upper pressure cover 101, the middle pressure cover 102, and the lower pressure cover 103 are installed on the slide 200 with screws, forming a relatively stable frame structure together with the slide 200. This provides an installation base for the guide rail plate assembly 400, ensuring that the guide rail plate assembly 400 can be accurately arranged around the slide 200 and the pressure cover 100. This ensures the stability and reliability of the entire hydrostatic guide rail structure, allowing the ram 300 to move precisely in a stable environment supported by the hydrostatic oil film, thus realizing the functions of guiding the machine tool and bearing cutting forces.

[0031] In this embodiment, the hydrostatic guide rail structure is applied to the Z-axis to achieve hydrostatic motion with an extremely low coefficient of friction along the Z-axis. In other embodiments, the hydrostatic guide rail structure is applied to the X and Y axes. This application is particularly effective in heavy-duty vertical lathes.

[0032] like Figures 2-4 As shown, the guide rail plate assembly 400 includes multiple guide rail plates 401 and multiple inserts 402. The static pressure cavity is located inside the guide rail plates 401 and inserts 402. The multiple guide rail plates 401 and multiple inserts 402 are respectively located at the four corners of the slide block 200 and the pressure cover 100.

[0033] Specifically, the guide plate 401 and the insert 402 are provided with annular grooves, and the static pressure chamber is located in the annular grooves.

[0034] Specifically, there are 8 guide rails 401.

[0035] Specifically, the number of inlays 402 is equal to the number of guide rails 401.

[0036] In this embodiment, four guide rail plates 401 are fixedly connected to the inner wall of the slide block 200 by screws, and four inserts 402 are connected to the inner wall of the slide block 200 and the inner wall of the cover 100 by pressure blocks.

[0037] Specifically, the guide plate 401 and the strip 402 between the lower pressure cover 103 and the slide 200 have the same structural arrangement as the guide plate 401 and the strip 402 between the upper pressure cover 101 and the slide 200.

[0038] like Figure 5 , Figure 6As shown, in a preferred embodiment, the size of the insert 402 gradually increases from the inside to the outside, which ensures the uniformity of the guide rail gap while improving the rigidity and stability of the guide rail assembly and compensating for wear and manufacturing errors.

[0039] like Figure 7 As shown, the oil circuit assembly 500 includes an oil suction filter 501, a motor 502, a gear pump 503, and an oil circuit 510. The oil suction filter 501 is located on the oil circuit 510 and before the gear pump 503. The motor 502 drives the gear pump 503 to draw static pressure oil into the oil circuit 510 through the oil suction filter 501.

[0040] The oil circuit assembly 500 also includes a relief valve 504, a pressure damper 505, and an oil pressure gauge 506, which are located on the oil circuit 510.

[0041] The oil circuit assembly 500 also includes a filter 507, multiple oil distribution pipes 511 and capillary damping pipes 508 that are matched with each of them. The filter 507 is located on the oil circuit 510 and between the oil circuit 510 and the multiple oil distribution pipes 511. The multiple oil distribution pipes 511 are formed by branches of the oil circuit 510. The oil distribution pipes 511 are connected to the static pressure chamber through the capillary damping pipes 508.

[0042] Specifically, the pressure values ​​of the 16 oil distribution pipes 511 are controlled by adjusting the length of the capillary damping tube 508.

[0043] Specifically, an oil pressure gauge 506 is also installed on the oil distribution pipe 511.

[0044] Specifically, there are 16 static pressure chambers.

[0045] Specifically, the number of capillary damping tubes 508 is equal to the number of static pressure chambers.

[0046] The oil circuit assembly 500 also includes a level switch 509, which plays a role in monitoring the hydrostatic oil level in the hydrostatic guide rail structure.

[0047] In this application, when the hydrostatic guide rail structure is in use, the motor 502 drives the gear pump 503 to rotate. The gear pump 503 draws up the hydrostatic oil through the suction filter 501. The hydrostatic oil volume and pressure of the main hydrostatic oil are controlled by the overflow valve 504. A pressure buffer 505 and an oil pressure gauge 506 are installed on the oil circuit 510 to display the pressure of the oil circuit 510. The hydrostatic oil enters the 16 capillary damping tubes 508 of the oil distribution pipe 511 through the filter 507. The pressure value of the 16 oil distribution pipes 511 is controlled by adjusting the length of the capillary damping tubes 508. An oil pressure gauge 506 is installed on each oil distribution pipe 511. The 16 oil distribution pipes 511 are respectively connected to the 16 hydrostatic chambers of the guide rail plate assembly 400. The hydrostatic oil forms a hydrostatic oil film in the hydrostatic chamber, which floats the slide block 300. In this hydrostatic guide rail structure, the motor 502 drives the gear pump 503 to draw hydrostatic oil into the oil circuit 510 through the oil suction filter 501. The hydrostatic oil is then injected into the hydrostatic chamber of the guide rail plate assembly 400 through the oil distribution pipe 511, forming a hydrostatic oil film that floats the ram 300, allowing it to move up and down within the slide block 200. This hydrostatic guide rail structure prevents direct contact between the ram 300, the slide block 200, and the pressure cover 100, resulting in advantages such as a low coefficient of friction, high sensitivity of the guide rail pair, good dynamic characteristics, high precision, good vibration resistance, and high load-bearing capacity.

[0048] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the concept of this utility model. These are all equivalent modifications and improvements made to the above embodiments based on the essential technology of this utility model, and all of these fall within the protection scope of this utility model.

Claims

1. A hydrostatic guideway structure comprising a gland, a slide, and a ram located between the slide and the gland, characterized by: The hydrostatic guide rail structure also includes a guide rail plate assembly and an oil circuit assembly. The guide rail plate assembly is fixed to the inner wall of the slide and the pressure cover. The guide rail plate assembly is provided with multiple hydrostatic chambers. The oil circuit assembly includes a motor, a gear pump and an oil circuit. The motor drives the gear pump to draw hydrostatic oil into the oil circuit. The hydrostatic oil is injected into the multiple hydrostatic chambers through the oil circuit to form a hydrostatic oil film, causing the slide to float.

2. The hydrostatic guideway structure of claim 1, wherein: The guide rail assembly includes multiple guide rails and multiple inserts. The static pressure cavity is located within the guide rails and inserts. The multiple guide rails and multiple inserts are respectively located at the four corners of the slide and the pressure cover.

3. The hydrostatic guideway structure of claim 2, wherein: The dimensions of the inlay strip gradually increase from the inside out.

4. The hydrostatic guideway structure of claim 1, wherein: The pressure cover includes an upper pressure cover, a middle pressure cover, and a lower pressure cover. The upper pressure cover, the middle pressure cover, and the lower pressure cover are threadedly connected to the slide block. Part of the guide rail plate assembly is located on the upper pressure cover and the lower pressure cover.

5. The hydrostatic guideway structure of claim 1, wherein: The oil circuit assembly also includes an oil suction filter, which is located on the oil circuit and before the gear pump.

6. The hydrostatic guideway structure of claim 5, wherein: The oil circuit assembly also includes an overflow valve, a pressure damper, and an oil pressure gauge, wherein the overflow valve, the pressure damper, and the oil pressure gauge are located on the oil circuit.

7. The hydrostatic guide rail structure according to claim 6, characterized in that: The oil circuit assembly also includes a filter, multiple oil distribution pipes and capillary damping pipes that are matched with each of them. The filter is located on the oil circuit and between the oil circuit and the multiple oil distribution pipes. The multiple oil distribution pipes are formed by branches of the oil circuit. The oil distribution pipes are connected to the static pressure chamber through the capillary damping pipes.

8. The hydrostatic guideway structure of claim 7, wherein: The oil pressure gauge is located on the oil distribution pipe.

9. The hydrostatic guideway structure of claim 7, wherein: The number of static pressure chambers is 16.

10. The hydrostatic guideway structure of claim 9, wherein: The number of capillary damping tubes is equal to the number of static pressure chambers.

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