Saddle ram structure of numerical control machine tool

Abstract

The utility model discloses a saddle ram structure of a numerical control machine tool, and relates to the field of numerical control machine tools. The sliding saddle is of a hollow structure, the ram is arranged in a hollow inner cavity of the sliding saddle in a sliding mode and is of a square structure, a guide rail is installed at the position, close to the corner, of each side face of the ram, and a plurality of sliding blocks with the same number are arranged on each guide rail; the ram is fixedly connected with the sliding blocks, and one side of each sliding block is provided with an oil injection structure used for supplying lubricating oil. The form that eight guide rails are arranged at four corners of the ram is adopted, and meanwhile, the saddle with a hollow inner cavity structure closed on the periphery is adopted, so that the rigidity of the mechanism is improved, and the rigidity can reach the rigidity of plastic-coated guide rails in comparison with the rigidity. Due to the characteristics of the linear guide rail, the sliding saddle ram structure has high-speed and high-precision operation capacity, the sliding saddle ram structure has high speed, high precision and high rigidity and has excellent comprehensive performance, and a machine tool adopting the sliding saddle ram structure has wider application space and capacity.

Description

Technical Field

[0001] The utility model relates to the field of numerical control machine tools, in particular to a saddle and ram structure of a numerical control machine tool. Background Art

[0002] The saddle, ram and its driving mechanism are very important components of CNC machine tools. The spindle of the machine tool's machining actuator is directly installed on this mechanism. Therefore, the accuracy and rigidity of this mechanism directly affect the machining accuracy level that the machine tool can ultimately achieve.

[0003] At present, there are basically two types of saddle and ram structures on the market. One is a plastic-coated cast iron sliding guide rail for the purpose of achieving high rigidity. The saddle is an open structure, and the open part is connected with a cover plate. This type of guide rail has a large contact area and high contact rigidity. The disadvantage is that the guide rail is sliding, the friction coefficient is large, it is easy to generate temperature rise, and it cannot run at high speed, and the running accuracy is low. At the same time, the saddle open structure and cover plate screw connection reduce the structural rigidity to a certain extent, which is suitable for low-speed and high-torque processing conditions. The second type is that the saddle and ram adopts a linear guide rail. The guide rail is generally arranged in 2 or 4, and the guide rail is rolling friction. The saddle is an open structure connected with a cover plate. This structural form can make the ram run at high speed in the saddle, which improves the running speed and running accuracy. Because this structure has fewer contact connection and fixed points of the linear guide rail, it is obviously less rigid than the first structure. Therefore, this structure is suitable for high-speed operation and small torque processing conditions.

[0004] At present, with the development of machine tool industry and processing industry, higher requirements are put forward for the comprehensive performance and processing capacity of machine tools, that is, in actual use, it is necessary to ensure low-speed and high-torque processing capacity, and also to have high-speed, high-precision and high-rigidity processing capacity; for this reason, we provide a saddle and ram structure for CNC machine tools. Utility Model Content

[0005] The utility model aims to provide a saddle and ram structure for a numerically controlled machine tool.

[0006] The technical problems solved by the utility model are:

[0007] (1) How to increase the connection rigidity by setting two guide rails at the four corners of the ram and adopting a hollow closed saddle and a linear slide rail to connect the ram to solve the problem that the saddle and ram structure in the prior art cannot have both low-speed rigidity and high-speed and high-precision operation capabilities;

[0008] (2) How to solve the problem of inconvenient lubrication and oiling of the slider in the closed ram saddle structure by opening an oiling hole on the top of the slider and setting a floating oiling head;

[0009] The utility model can be implemented by the following technical scheme: a saddle and ram structure of a CNC machine tool, comprising a saddle with a hollow structure and a ram with a square structure slidably arranged in the hollow inner cavity thereof, guide rails are installed at the corner positions of each side of the ram, and a plurality of equal sliders are arranged on each guide rail;

[0010] The ram is fixedly connected to the slider, and an oil injection structure for supplying lubricating oil is arranged on one side of each slider.

[0011] A further technical improvement of the utility model is that the guide rails on two adjacent sides of the ram are reference guide rails, and the guide rails on the other two adjacent sides are subordinate guide rails;

[0012] A plurality of fixing through holes are provided on the side walls of the inner cavity of the slide saddle corresponding to the two side surfaces of the slide ram on which the slave guide rail is installed. Fixing blocks are arranged in the fixing through holes to limit and fix the slide block.

[0013] A further technical improvement of the utility model is that the number of the fixed blocks corresponds one to one with the sliding blocks on the slave guide rails.

[0014] A further technical improvement of the utility model is that the fixing block and the sliding saddle are fixed by bolts, and an adjusting gasket is arranged between the fixing block and the sliding saddle.

[0015] A further technical improvement of the utility model is that a screw assembly is arranged inside one side wall of the saddle, a transmission screw of the screw assembly is rotatably arranged with the saddle, a nut seat of the screw assembly is threadedly sleeved on the outside of the transmission screw, and the nut seat is fixedly connected to the opposite side of the slide.

[0016] A further technical improvement of the utility model is that the oil filling structure includes an operating hole opened on the side wall of the fixed block or the sliding saddle, an oil filling head is floatingly installed on one side of the operating hole close to the sliding block, an oil filling hole is opened in the middle position of the top of the sliding block, and the end of the oil filling head is sealed in the oil filling hole.

[0017] A further technical improvement of the utility model is that two plunger springs are symmetrically installed on one side of the oil filling head, and are floatingly connected to the bottom of the operating hole through the plunger springs.

[0018] The further technical improvement of the utility model is that a sealing rubber pad is arranged between the oil filling head and the sliding block to seal the oil filling hole, and a one-way valve for inlet but not outlet is arranged in the oil filling head.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] 1. The present invention adopts the form of arranging eight guide rails at the four corners of the ram, and arranging two guide rails in the vertical direction at each corner. This structural arrangement increases the connection rigidity of the saddle and ram. At the same time, the saddle with a closed hollow inner cavity structure on all sides is adopted to improve the rigidity of the mechanism. In terms of rigidity, it can reach the rigidity of the plastic-coated guide rail. The characteristics of the linear guide rail also enable this mechanism to have the ability to operate at high speed and high precision. The saddle and ram structure provided by the present invention has high speed, high precision and high rigidity, and has excellent comprehensive performance, so that the machine tool using this mechanism has a wider application space and capacity.

[0021] 2. By opening an oil filling hole on the top of the slider and setting a floating oil filling head, the slider fixed in the hollow inner cavity of the saddle can be more conveniently oiled, avoiding the sliding smoothness between the guide rail sliders being affected due to the difficulty in oiling. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to facilitate understanding by those skilled in the art, the present invention is further described below in conjunction with the accompanying drawings.

[0023] Figure 1 It is a schematic diagram of the overall external structure of the utility model;

[0024] Figure 2 This is a schematic diagram of the overall external structure connection of the utility model from another angle;

[0025] Figure 3 This is a schematic diagram of the connection of the sliding saddle structure of the utility model;

[0026] Figure 4 This is a schematic diagram of the external connection and installation relationship of the ram of the utility model;

[0027] Figure 5 This is a schematic diagram of the oil injection structure between the fixed block and the sliding block of the utility model structure;

[0028] Figure 6 For this utility model Figure 1 A partial enlarged view of the middle A;

[0029] Figure 7 For this utility model Figure 6 A partial enlarged view of point B in the middle.

[0030] In the figure: 1. Saddle; 2. Ram; 3. Motor seat; 4. Screw assembly; 5. Drive motor; 6. Guide rail; 7. Slider; 8. Fixed block; 9. Adjustment gasket; 10. Processing execution spindle; 11. Oiling head; 12. Plunger spring; 13. Sealing rubber pad; 101. Fixed through hole; 701. Oiling hole; 801. Oiling operation hole. DETAILED DESCRIPTION

[0031] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0032] See also Figure 1-7 As shown, a saddle and ram structure of a CNC machine tool comprises a saddle 1 and a ram 2 which is arranged to slide relative to each other. The saddle 1 adopts a cavity structure which is closed on all sides. This closed cavity structure avoids the problem of insufficient connection rigidity caused by screw connection of an open saddle. The ram 2 adopts a square linear slide rail.

[0033] Specifically, two guide rails 6 are installed on the four sides of the ram 2 along its moving direction, and the guide rails 6 are fixed at the right angles formed by every two adjacent sides, that is, they are fixed at the four corners of the ram 2 and two guide rails 6 are installed at each corner, so a total of eight guide rails 6 are arranged and installed;

[0034] A screw assembly 4 is arranged inside one side wall of the saddle 1, and a motor seat 3 is fixed at the end position of the saddle 1 outside the corresponding side wall, and a driving motor 5 for driving the screw assembly to operate is fixed on the motor seat 3; the screw assembly includes a transmission screw and a nut seat, wherein the transmission screw is rotatably arranged with the saddle 1, the nut seat is threadedly sleeved on the outside of the transmission screw, and the nut seat is fixedly connected to the opposite side of the ram 2, so that the rotation of the transmission screw will drive the ram 2 fixedly connected to the nut seat to move accordingly;

[0035] More specifically, the nut mounting plane on the ram 2 and an adjacent plane are used as assembly reference planes, the guide rails 6 mounted on the corresponding planes are defined as reference guide rails, and the guide rails 6 mounted on the other two planes are defined as slave guide rails, and a plurality of fixing through holes 101 are provided on the side wall of the saddle 1 corresponding to the assembly reference plane of the ram 2;

[0036] A plurality of sliders 7 are slidably mounted on each guide rail 6. The sliders 7 on the reference guide rail are evenly mounted on the inner cavity side wall of the slide saddle 1 by screws. The sliders 7 on the slave guide rail are positioned by a fixing block 8 arranged in a fixing through hole 101. The fixing block 8 is threadedly fixed to the slider 7. The fixing block 8 is fixed to the slide saddle 1 by bolts and an adjusting gasket 9 is arranged between the two. By changing the thickness of the adjusting gasket, it is ensured that the guide rail 6 and the slider 7 can be finally accurately fixed on the slide saddle 1 and the slide ram 2 to ensure assembly accuracy.

[0037] Furthermore, a processing execution spindle 10 is installed at the bottom of the cavity of the ram 2;

[0038] Moreover, due to the adoption of this installation method, there is a lack of injection operation space for the lubricating oil between the slider 7 and the guide rail 6, which plays a role in lubrication and rust prevention. Therefore, an oil filling hole 701 is opened in the middle position of the top of the slider 7, and an oil filling operation hole 801 is arranged at a position corresponding to the oil filling hole 701 on the fixed block 8. An oil filling head 11 is arranged at the end position of the oil filling operation hole 801 close to 7. The oil filling head 11 is provided with a one-way valve that can only enter but not exit. Two plunger springs 12 are symmetrically installed on one side of the oil filling head 11, and the oil filling head 11 is floatingly connected to the fixed block 8 through the plunger spring 12. A sealing rubber pad 13 is provided between the oil filling head 11 and the slider 7 to seal the oil filling hole 701. The plunger spring 12 ensures a tight connection between the fixed block 8 and the slider 7.

[0039] It should be noted that the above-mentioned oil filling structure is also provided between the slider 7 on the reference guide rail and the inner wall of the saddle 1. At this time, the oil filling head 11 is floatingly installed on the saddle 1 and connected to the oil filling hole 701. The saddle 1 is provided with a corresponding operating hole.

[0040] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A saddle and ram structure for a CNC machine tool, characterized in that: It comprises a hollow-structured slide saddle (1) and a square-structured slide ram (2) slidably arranged in the hollow inner cavity thereof, wherein a guide rail (6) is installed at a corner position of each side of the slide ram (2), and each guide rail (6) is provided with a plurality of equal sliders (7); The ram (2) is fixedly connected to the slider (7), and an oil injection structure for supplying lubricating oil is provided on one side of each slider (7).

2. The saddle and ram structure of a CNC machine tool according to claim 1, characterized in that: The guide rails (6) on two adjacent sides of the ram (2) are reference guide rails, and the guide rails (6) on the other two adjacent sides are slave guide rails; A plurality of fixing through holes (101) are provided on the inner cavity side wall of the slide saddle (1) corresponding to the two side surfaces on the slide ram (2) on which the slave guide rail is installed. A fixing block (8) is arranged in the fixing through hole (101). The fixing block (8) limits and fixes the slide block (7).

3. The saddle and ram structure of a CNC machine tool according to claim 2, characterized in that: The number of the fixed blocks (8) corresponds one-to-one to the number of the sliding blocks (7) located on the slave guide rail.

4. The saddle and ram structure of a CNC machine tool according to claim 2, characterized in that: The fixing block (8) and the sliding saddle (1) are fixed by bolts, and an adjustment gasket (9) is provided between the fixing block (8) and the sliding saddle (1).

5. The saddle and ram structure of a CNC machine tool according to claim 1, characterized in that: A screw assembly (4) is arranged inside a side wall of the slide saddle (1); a transmission screw of the screw assembly (4) is rotatably arranged with the slide saddle (1); a nut seat of the screw assembly (4) is threadedly sleeved on the outside of the transmission screw, and the nut seat is fixedly connected to the opposite side of the slide bolster (2).

6. The saddle and ram structure of a CNC machine tool according to claim 1, characterized in that: The oil injection structure comprises an operating hole formed on the side wall of the fixed block (8) or the saddle (1); an oil injection head (11) is floatingly mounted on one side of the operating hole close to the slider (7); an oil injection hole (701) is formed at the middle of the top of the slider (7); and an end of the oil injection head (11) is sealed in the oil injection hole (701).

7. The saddle and ram structure of a CNC machine tool according to claim 6, characterized in that: Two plunger springs (12) are symmetrically mounted on one side of the oil filling head (11), and are floatingly connected to the bottom of the operating hole via the plunger springs (12).

8. The saddle and ram structure of a CNC machine tool according to claim 6, characterized in that: A sealing rubber pad (13) is provided between the oil filling head (11) and the slider (7) to seal the oil filling hole (701), and a one-way valve that allows oil to enter but not exit is provided in the oil filling head (11).

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