Long screw rod supporting mechanism and numerical control machine tool

Abstract

The utility model discloses a long screw rod supporting mechanism which comprises a guide rail parallel to a long screw rod, two unpowered sliding blocks are arranged on the guide rail, a bracket is arranged on the unpowered sliding blocks, two roller bearings are arranged on the bracket, and the two roller bearings are matched to form two-point supporting and support the long screw rod. A synchronous connecting rod is arranged between the two brackets, and a nut is arranged on the long screw rod between the two brackets. The long screw can be supported in a self-adaptive mode, the problem that the middle of the long screw droops is effectively solved, and the use cost is controlled.

Description

Technical Field

[0001] The utility model relates to the technical field of machining, in particular to a long screw supporting mechanism and a numerically controlled machine tool. Background Art

[0002] Machining equipment requires long screws as drive units. After prolonged use, the middle portion of a long screw can sag or even undergo plastic deformation, affecting transmission accuracy. The main causes of this mid-section sag include weight and temperature rise. In horizontal applications, these factors reduce the rigidity of a long screw, leading to mid-section sag. Furthermore, excessively long screws can sag in the middle due to their weight. This can cause radial loads on the screw and create the risk of excessive bending stress at the shaft ends due to the rotation of the screw shaft.

[0003] Since the long screw generally controls the axial reciprocating movement of the nut with which it cooperates by self-rotation, adding a fixed fulcrum will interfere with the movement of the nut. Therefore, this solution is not applicable. Some companies also have high requirements for the material of the long screw, or increase the diameter of the long screw to increase the length of the long screw. This method undoubtedly increases the cost of use. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to provide a long screw supporting mechanism and a numerically controlled machine tool, which can adaptively support the long screw and control the use cost.

[0005] In order to solve the above technical problems, the utility model provides a long screw support mechanism, including a guide rail arranged parallel to the long screw, two unpowered sliders are provided on the guide rail, a bracket is provided on the unpowered slider, two roller bearings are provided on the bracket, the two roller bearings cooperate to form two-point support and support the long screw, a synchronous connecting rod is provided between the two brackets, and a nut is provided on the long screw between the two brackets.

[0006] Furthermore, a transfer block is provided on the unpowered sliding block, and a side wall of the transfer block is fixedly connected to the bracket.

[0007] Furthermore, the bracket is provided with an arc-shaped avoidance portion.

[0008] Furthermore, a positioning protrusion is provided on one side of the bottom of the adapter block, and the positioning protrusion abuts against a side wall of the unpowered sliding block.

[0009] Furthermore, a plastic anti-collision block is provided on the bracket, and the plastic anti-collision block is provided on the surface of the bracket adjacent to the nut.

[0010] Furthermore, the roller bearing is provided with arc chamfers at both ends in the axial direction.

[0011] Furthermore, a plurality of positioning blocks are provided on one side of the guide track, and the positioning blocks abut against the side wall of the guide track.

[0012] A numerically controlled machine tool adopts any one of the supporting mechanisms described above.

[0013] Beneficial effects of the utility model:

[0014] 1. The bracket cooperates with the roller bearing to effectively support the long screw at the suspended position, so that the long screw is suspended by the bracket from a long size to a short size, effectively solving the problem of sagging due to its own weight.

[0015] 2. The two brackets are fixed together by a synchronous connecting rod. When one of the brackets is moved by a force applied, the other bracket also moves synchronously. That is, when one bracket moves toward the end of the long screw, the other bracket moves toward the middle of the long screw. Therefore, the two brackets can always play a supporting role on the long screw.

[0016] 3. The roller bearing can adapt to the rotation of the long screw, reducing friction and sticking, and making the support smoother. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the installation structure of the support structure of the utility model arranged in the frame;

[0018] Figure 2 This is a schematic diagram of the cooperation between the support structure and the long screw of the utility model;

[0019] Figure 3 This is a schematic diagram of the bracket portion of the present invention from a first perspective;

[0020] Figure 4 This is a schematic diagram of the bracket portion of the present invention from a second viewing angle;

[0021] Figure 5 This is a schematic diagram of the roller bearing structure of the utility model;

[0022] Figure 6 It is a schematic diagram of the position displacement of two brackets of the utility model. DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0024] Reference Figures 1 to 5As shown, an embodiment of the long screw supporting mechanism of the present invention includes a guide rail 2 arranged parallel to the long screw 1, two unpowered sliders 3 are provided on the guide rail, a bracket 4 is provided on the unpowered slider, and two roller bearings 5 ​​are provided on the bracket. The two roller bearings cooperate to form a two-point support and support the long screw. In addition to the support at both ends of the long screw, the parts inside the two ends are further supported by the two brackets. A synchronous connecting rod 6 is provided between the two brackets. The movement of one bracket will drive the synchronous movement of the other bracket. A nut 7 is provided on the long screw between the two brackets.

[0025] The length of the above-mentioned synchronous connecting rod can be set according to the equal-division size of the long screw rod. For example, if the length of the long screw rod is 3m, the length of the synchronous connecting rod can be set to 1m, so that when the two brackets play a supporting role, the middle part of the long screw rod can always be supported. Specifically, when one of the brackets is located on one side of the end of the long screw rod, the other bracket must be in the middle position of the long screw rod. At this time, both ends and the middle point of the long screw rod are supported, forming a three-point support effect. When the middle point of the synchronous connecting rod is located at the middle point of the long screw rod, both ends and the middle part of the long screw rod are also supported, that is, the two brackets simultaneously support the middle part of the long screw rod. At this time, the middle part of the long screw rod is supported by two brackets, forming a four-point support effect.

[0026] During use, the long screw rotates, driving the nut on it to move axially. When the nut contacts one of the brackets and continues to move, the nut will drive the bracket to move synchronously. Figure 6 As shown, the bracket is located at the middle point of the long screw, which is the first bracket. Its movement will change the supporting position and move toward one end of the long screw, while the other bracket moves synchronously and also changes the supporting position accordingly. This bracket is the second bracket. The second bracket moves toward the other end of the long screw along with the adjacent long screw end. When the first bracket moves to the position of the long screw end connected to it, the second bracket will move to the middle point of the long screw. During the movement, the first bracket first plays a core supporting effect at the middle point of the long screw, and the second bracket basically does not play an effective supporting effect because it is close to the end of the long screw. As it moves, the first bracket will gradually reduce its supporting effect, and the supporting effect of the second bracket will increase. Finally, the first bracket is close to the end of the long screw adjacent to it, and it basically does not play a supporting effect, while the second bracket moves to the end of the long screw and plays a core supporting effect. In the above process, the long screw rod is always supported by the bracket at the position between the two ends, thereby solving the problem of the long screw rod sagging.

[0027] Since the movement of the bracket is pushed by the nut, the impact force will be applied to the bracket at the moment of contact, and the impact force will be transmitted to the unpowered slider through the bracket, causing noise and impact force to damage the sliding part, thereby causing problems such as movement jamming. Therefore, a plastic anti-collision block 11 is provided on the bracket. The plastic anti-collision block is provided on the surface of the bracket adjacent to the nut. The nut contacts the plastic anti-collision block and pushes the bracket to move. The plastic anti-collision block can play a good buffering role.

[0028] The above-mentioned unpowered slider is provided with an adapter block 8, the side wall of which is fixedly connected to the bracket. The adapter block can facilitate the installation of the bracket. The adapter block is locked to the unpowered slider from top to bottom, and the bracket is locked to the adapter block horizontally. The locking positions of the two do not interfere with each other, which facilitates assembly. During the assembly process, in order to ensure that the bracket can be perpendicular to the long screw after being extended, so as to ensure the accurate relative position of the roller bearing and the long screw, a positioning protrusion 10 is provided on one side of the bottom of the adapter block. The positioning protrusion directly abuts against a side wall of the unpowered slider, which defines the installation direction of the side wall of the adapter block, so that the surface of the side wall of the adapter block is parallel to the radial cross-section of the long screw, thereby ensuring the relative installation accuracy of the bracket and the long screw.

[0029] Since the height difference between the long screw and the guide rail is small, after the bracket is installed on the unpowered slider, the height of the bracket is basically consistent with the height of the long screw. In order to effectively support it, an arc-shaped avoidance portion 9 is provided on the bracket. The bracket extends from the side of the long screw into the lower part through the arc-shaped avoidance portion, which has a good supporting effect.

[0030] After the roller bearing contacts the long screw, the outer ring surface of the roller bearing abuts against the surface of the long screw. The rotation of the long screw drives the roller bearing to rotate, reducing friction. When the bracket is driven to move, the roller bearing moves along the axial direction of the long screw. At this time, if the axial side of the roller bearing is a right-angled side, it will interfere with the threaded part on the long screw. Therefore, arc chamfers 12 are set at both ends of the axial direction of the roller bearing.

[0031] A plurality of positioning blocks 13 are provided on one side of the guide rail, which abut against the side wall of the guide rail. The plurality of positioning blocks define the installation position of the guide rail to improve the straightness of the guide rail after installation and reduce the difficulty of assembly.

[0032] The present invention also discloses a CNC machine tool, in which the above-mentioned supporting mechanism is fixed on the mounting position 14 of the frame 16 of the CNC machine tool, the nut in the supporting mechanism is connected to the two-axis mechanism 15, and a cutter disc is installed on the two-axis mechanism. The rotation of the long screw drives the nut to move, and the movement of the nut drives the two-axis mechanism to move along the axial direction of the long screw, that is, drives the cutter disc to move.

[0033] The above embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Any equivalent substitution or modification made by those skilled in the art based on the present invention shall fall within the protection scope of the present invention.

Claims

1. A long screw support mechanism, characterized in that: It includes a guide rail arranged parallel to the long screw, two unpowered sliders are provided on the guide rail, a bracket is provided on the unpowered slider, two roller bearings are provided on the bracket, the two roller bearings cooperate to form a two-point support and support the long screw, a synchronous connecting rod is provided between the two brackets, and a nut is provided on the long screw between the two brackets.

2. The long screw supporting mechanism according to claim 1, characterized in that: The unpowered sliding block is provided with a transfer block, and a side wall of the transfer block is fixedly connected to the bracket.

3. The long screw supporting mechanism according to claim 2, characterized in that: The bracket is provided with an arc-shaped avoidance portion.

4. The long screw supporting mechanism according to claim 2, wherein: A positioning protrusion is provided on one side of the bottom of the adapter block, and the positioning protrusion abuts against a side wall of the unpowered sliding block.

5. The long screw supporting mechanism according to claim 1, wherein: The bracket is provided with a plastic anti-collision block, and the plastic anti-collision block is arranged on the surface of the bracket adjacent to the nut.

6. The long screw supporting mechanism according to claim 1, characterized in that: The roller bearing is provided with arc chamfers at both ends in the axial direction.

7. The long screw supporting mechanism according to claim 1, characterized in that: A plurality of positioning blocks are provided on one side of the guide track, and the positioning blocks abut against the side wall of the guide track.

8. A CNC machine tool, characterized in that: The supporting mechanism according to any one of claims 1 to 7 is adopted.

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