A screw nut mechanism

Abstract

The application discloses a screw nut mechanism, relates to the technical field of screw nuts, and solves the problem of poor limiting effect on the movable nut, comprising a mounting base, further comprising connecting pieces fixedly connected to the top of the mounting base and the left and right side ports, and a screw rod is rotatably connected to the connecting pieces, a driving motor is cooperatively installed on the surface of the side of the connecting piece away from the screw rod, the power output end of the driving motor is connected with the power input end of the screw rod through a shaft coupling, one side port of a limiting sliding block is pushed out from the assembling port through a screw rod, the limiting sliding block and the movable nut are completely separated, the movable nut rotates together with the screw rod without being limited, and thus skidding is avoided, the movable nut and the screw rod are protected, the service life of the screw nut mechanism is prevented from being reduced due to material damage, and the utility value is high.

Description

Technical Field

[0001] This invention relates to the field of lead screw and nut technology, specifically to a lead screw and nut mechanism. Background Technology

[0002] Lead screws and nuts are ideal products for converting rotary motion into linear motion, or linear motion into rotary motion. They are the most commonly used transmission components in machine tools and precision machinery. Their main function is to convert rotary motion into linear motion, or torque into axial reciprocating force, while also possessing the characteristics of high precision, reversibility, and high efficiency.

[0003] Currently, when using lead screws and nuts as transmission elements for machining, sensors are often used to limit the position of the thread on the lead screw. However, in actual production, due to operator errors, the sensor's prompts may not effectively alert workers to the nut's position on the lead screw. This can easily cause the nut to move beyond its limit, resulting in slippage between the lead screw and the nut. This can lead to friction between the nut and the lead screw, damaging their materials and causing a loss of precision in their fit, making the nut wobble on the lead screw. Therefore, a method has been proposed to improve the control of lead screw and nut mechanisms. A limiting screw and nut mechanism, such as the one disclosed in CN212918590U for a lathe, includes two side plates arranged in parallel. Two baffles are positioned between the two side plates, and a connecting plate is fixed between the two baffles. Side connecting plates are fixed on both sides of the baffles, and each side connecting plate has a sliding hole. Bearings are fixed on both side plates, one of which is connected to a screw. One end of the screw passes through the connecting plate and the other bearing and extends outward. A nut is fixed at the contact point between the connecting plate and the screw. Slide plates are fixed on both sides of one side plate, with one end of the slide plate passing through the sliding hole and fixed to the other side plate. This screw and nut mechanism moves the baffles by rotating the screw, which connects to the nut.

[0004] However, the aforementioned screw and nut mechanism, when limiting the position of the thread, only prevents the nut from continuing to move in one direction on the screw by having the limiting plate abut against the side wall of the sliding plate. However, in the prior art, the screw is generally driven to rotate by a drive device, such as a servo motor. Thus, when the nut moves and comes into contact with the limiting plate, it cannot stop the servo motor from driving the screw to rotate. At this time, the nut is in contact with the limiting plate, but the screw is still rotating, which will cause slippage between the nut and the screw, resulting in friction between the nut and the screw and causing material damage. This does not solve the problem of protecting the nut and the screw when the nut moves beyond the limit on the screw. Therefore, it is necessary to design a screw and nut mechanism. Summary of the Invention

[0005] The purpose of this invention is to provide a screw nut mechanism that can limit the position of a movable nut, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a lead screw and nut mechanism, including a mounting base, and a connector fixedly connected to the left and right ports on the top of the mounting base, wherein a lead screw is rotatably connected to the connector, and a drive motor is fitted on the side surface of the connector away from the lead screw, wherein the power output end of the drive motor is connected to the power input end of the lead screw through the connector via a coupling.

[0007] Preferably, a side plate is fixedly connected to one port of the mounting base. The side plate has a slide rail for the limiting slider to slide. A movable nut is threaded onto the lead screw. The end of the movable nut near the limiting slider has an assembly port, and an insertion hole is integrally formed on the inner wall surface of one side of the assembly port. A spring B is fixedly connected to the inner wall surface of the port of the limiting slider away from the slide rail, and a pin is fixedly connected to one end of the spring B. The size of the pin and the insertion hole are suitable for matching. When the lead screw rotates under the drive of the drive motor, the movable nut threaded to the lead screw will move along the lead screw through the threaded structure. This allows for adjustment of the position of the movable nut and the limiting slider, thereby using the movable nut as a transmission component to manufacture and process the machinery.

[0008] Preferably, a pressure plate is movably connected to the side of the movable nut away from the lead screw via spring A. Inclined plates are fixedly connected to the left and right ends of the pressure plate. A push rod adapted to the insertion hole is fixedly connected to the side of the pressure plate near the insertion hole, causing the pressure plate to move towards the side closer to the movable nut until the push rod is inserted into the insertion hole, pushing out the pin that is currently in the insertion hole, thereby releasing the fixing structure between the pin and the insertion hole. This allows for relatively convenient disassembly of the assembly structure of the movable nut and the limiting slider.

[0009] Preferably, an adjusting block is fixedly connected to the side port of the side plate away from the drive motor. A screw is slidably fitted into the central hole of the adjusting block. A limiting ring is fixedly connected to one side port of the screw, and a compression ring is fixedly connected to the outer edge surface of the screw away from the limiting ring. When one side port of the screw contacts the limiting slider, the screw can push one side port of the limiting slider out of the assembly port, so that the limiting slider and the movable nut are completely separated. At this time, the movable nut will rotate with the screw without being limited, so as not to slip. This can protect the movable nut and the screw, and prevent the material from being damaged, which would reduce the service life of the screw and nut mechanism. It has high practicality.

[0010] Preferably, a bearing and an internal threaded knob are inserted through the side of the screw near the extrusion ring, and the internal threaded knob is movably connected to the surface of the adjusting block through the bearing. The inner wall of the internal threaded knob is threadedly connected to the outer edge surface of the screw, which can adjust the length of the screw on both sides of the adjusting block. This changes the contact position between the limiting slider and the screw, thereby adjusting the over-limit position of the screw-nut mechanism, thus meeting the usage requirements under different conditions. It is more flexible and versatile in use and has good practicality.

[0011] Preferably, a telescopic plate is fixedly connected to the bottom surface of the adjusting block near the bearing, and the telescopic head of the telescopic plate is fixedly connected to the outer edge of the screw through a fixing block. The telescopic plate limits the movement of the screw so that it does not rotate with the internal thread knob, but is displaced relative to the internal thread knob, thereby changing its length on both sides of the adjusting block, thus enabling adjustment of the position beyond the limit.

[0012] Preferably, the elastic coefficient of spring A is less than that of spring B. When the push rod is inserted into the insertion hole, and the movable nut does not continue to move towards the over-limit position, and is returned by the lead screw, the spring B, which is in a deformed state at this time, can restore its deformation and push the push rod out of the insertion hole, thereby fixing the movable nut and the limit slider together again.

[0013] Preferably, the size of the port on the side of the limiting slider away from the slide rail is the same as the size of the assembly port, which allows the limiting slider to be properly inserted into the assembly port without leaving gaps. This ensures that the limiting slider will not wobble when the movable nut moves it, thus improving the precision of the movable nut in moving the limiting slider.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] This invention uses a screw to push one side of the limiting slider out of the assembly port, completely separating the limiting slider and the movable nut. At this time, the movable nut will rotate with the screw without being limited, thus preventing slippage. This protects the movable nut and the lead screw, preventing material damage that could reduce the service life of the lead screw and nut mechanism. It has high practicality.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the screw structure of the present invention;

[0020] Figure 3 This is a schematic diagram of the structure of the movable nut and the limiting slider of the present invention;

[0021] Figure 4 This is a schematic diagram of the structure of the pressure plate of the present invention;

[0022] Figure 5 This is a schematic diagram of the cross-section of the limiting slider of the present invention.

[0023] In the diagram: 1. Mounting base; 2. Movable nut; 3. Connector; 4. Limiting ring; 5. Screw; 6. Adjusting block; 7. Extrusion ring; 8. Limiting slider; 9. Slide rail; 10. Side plate; 11. Drive motor; 12. Lead screw; 13. Bearing; 14. Internal thread knob; 15. Telescopic plate; 16. Fixing block; 17. Assembly port; 18. Insertion hole; 19. Spring A; 20. Inclined plate; 21. Pressure plate; 22. Pin; 23. Spring B; 24. Top rod. Detailed Implementation

[0024] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0025] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0026] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0027] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution. Example

[0028] Please see Figure 1 and Figure 2 The diagram shows a lead screw and nut mechanism, including a mounting base 1 and a connector 3 fixedly connected to the left and right ports on the top of the mounting base 1. A lead screw 12 is rotatably connected to the connector 3. A drive motor 11 is fitted on the side of the connector 3 away from the lead screw 12. The power output end of the drive motor 11 is connected to the power input end of the lead screw 12 after passing through the connector 3 via a coupling.

[0029] It should be noted that in this solution, by turning on the drive motor 11 with the control switch, the coupling on the drive motor 11 can drive the lead screw 12 to rotate.

[0030] Please refer to Figure 4 and Figure 5 As shown in the figure, a side plate 10 is fixedly connected to one side port of the mounting base 1. The side plate 10 is equipped with a slide rail 9 for the sliding of the limiting slider 8. A movable nut 2 is threaded onto the lead screw 12. An assembly port 17 is constructed at the end of the movable nut 2 near the limiting slider 8. An insertion hole 18 is integrally formed on the inner wall surface of one side of the assembly port 17. A spring B23 is fixedly connected to the inner wall surface of the side port of the limiting slider 8 away from the slide rail 9. A pin 22 is fixedly connected to one end of the spring B23. The size of the pin 22 is suitable for matching the size of the insertion hole 18. The size of the side port of the limiting slider 8 away from the slide rail 9 is the same as the size of the assembly port 17.

[0031] It should be noted that: First, press the pin 22 inward to compress and deform the spring B23. Then, insert the end of the limiting slider 8 away from the slide rail 9 into the assembly port 17, so that the pin 22 contacts the insertion hole 18, thereby restoring the deformation of the spring B23. At this time, the pin 22 is inserted into the insertion hole 18, and the movable nut 2 and the limiting slider 8 are connected as a whole. At this time, the movable nut 2 will not rotate with the lead screw 12, but will make linear motion under the limiting condition of the slide rail 9. Then, when the lead screw 12 rotates under the drive of the drive motor 11, the movable nut 2, which is threaded to the lead screw 12, will move along the lead screw 12 through the thread structure with the lead screw 12. In this way, the position of the movable nut 2 and the limiting slider 8 can be adjusted, thereby using the movable nut 2 as a transmission component to manufacture and process the machine.

[0032] It is worth noting that, in order to effectively prevent damage to the movable nut and lead screw when exceeding the limit, a pressure plate 21 is movably connected to the side surface of the movable nut 2 away from the lead screw 12 via a spring A19. Inclined plates 20 are fixedly connected to the left and right ends of the pressure plate 21. A top rod 24, adapted to the insertion hole 18, is fixedly connected to the side surface of the pressure plate 21 near the insertion hole 18. An adjusting block 6 is fixedly connected to the side end of the side plate 10 away from the drive motor 11. A screw 5 is slidably fitted into the central hole of the adjusting block 6. A limit ring 4 is fixedly connected to one end of the screw 5, and a compression ring 7 is fixedly connected to the outer edge surface of the screw 5 away from the limit ring 4. When the movable nut 2 drives the limit slider 8 to move to one side until it is about to exceed the limit and is still moving, the compression ring 7 on the screw 5 will be pressed by the inclined plate 20. The pressure plate 21 is brought close to the movable nut 2, thereby inserting the push rod 24 into the insertion hole 18. This pushes out the pin 22, which is currently in the insertion hole 18, thus releasing the fixing structure between the pin 22 and the insertion hole 18. At this time, the movable nut 2 and the limiting slider 8 are no longer in a mutually fixed state. Then, as the movable nut 2 drives the limiting slider 8 to continue moving, one end of the screw 5 comes into contact with the limiting slider 8. This pushes one end of the limiting slider 8 out of the assembly port 17 through the screw 5, completely separating the limiting slider 8 and the movable nut 2. At this time, the movable nut 2 will rotate with the screw 5 without being limited, thus preventing slippage. This protects the movable nut 2 and the screw, preventing material damage that could reduce the service life of the screw 12 nut mechanism, making it highly practical. Example

[0033] Please see Figure 4 and Figure 5This embodiment further illustrates Example 1. In the figure, the screw 5 near the extrusion ring 7 has a bearing 13 and an internal thread knob 14 passing through it. The internal thread knob 14 is movably connected to the surface of the adjusting block 6 through the bearing 13. The inner wall of the internal thread knob 14 is threadedly connected to the outer edge surface of the screw 5.

[0034] It should be noted that rotating the internal thread knob 14 causes the screw 5 to shift relative to the internal thread knob 14 through the threaded structure, thereby adjusting the length of the screw 5 on both sides of the adjusting block 6. This changes the contact position between the limit slider 8 and the screw 5, thus adjusting the over-limit position of the lead screw 12 nut mechanism. This meets the usage requirements under different conditions, making it flexible, versatile, and practical.

[0035] Additionally, please see Figure 5 In the figure, a telescopic plate 15 is fixedly connected to the bottom surface of the adjusting block 6 near the bearing 13, and the telescopic head of the telescopic plate 15 is fixedly connected to the outer edge of the screw 5 through the fixing block 16.

[0036] It should be noted that the movement of the screw 5 is limited by the telescopic plate 15, so that it does not rotate with the internal thread knob 14, but is displaced relative to the internal thread knob 14, thereby changing its length on both sides of the adjusting block 6, so as to adjust the position of the screw 5. Example

[0037] Please see Figure 3 This embodiment further illustrates other embodiments, and the spring constant of spring A19 in the figure is less than the spring constant of spring B23.

[0038] It should be noted that when the push rod 24 is inserted into the insertion hole 18, and the movable nut 2 does not continue to move to the over-limit position, and is returned by the lead screw 12, the spring B23, which is in a deformed state at this time, can restore its deformation and push the push rod 24 out of the insertion hole 18, thereby fixing the movable nut 2 and the limit slider 8 back to each other.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lead screw and nut mechanism, comprising; Mounting base (1); characterized in that Also includes; A connector (3) is fixedly connected to the left and right ports on the top of the mounting base (1), and a lead screw (12) is rotatably connected to the connector (3). A drive motor (11) is installed on the side surface of the connector (3) away from the lead screw (12). The power output end of the drive motor (11) is connected to the power input end of the lead screw (12) after passing through the connector (3) via a coupling. A side plate (10) is fixedly connected to one side port of the mounting base (1). A slide rail (9) for the limiting slider (8) to slide is constructed on the side plate (10). A movable nut (2) is threaded onto the lead screw (12). An assembly port (17) is constructed at the end of the movable nut (2) near the limiting slider (8). An insertion hole (18) is integrally formed on the inner wall surface of one side of the assembly port (17). A fixed connection is made to the inner wall surface of the side port of the limiting slider (8) away from the slide rail (9). A spring B (23) is connected, and a pin (22) is fixedly connected to one end of the spring B (23). The size of the pin (22) is suitable for the insertion hole (18). A pressure plate (21) is movably connected to the side surface of the movable nut (2) away from the screw (12) via a spring A (19). Inclined plates (20) are fixedly connected to the left and right ports of the pressure plate (21). A top rod (24) that matches the insertion hole (18) is fixedly connected to the side surface of the pressure plate (21) near the insertion hole (18). An adjusting block (6) is fixedly connected to the side port of the side plate (10) away from the drive motor (11). A screw (5) is slidably fitted in the central hole of the adjusting block (6). A limiting ring (4) is fixedly connected to one side port of the screw (5), and a compression ring (7) is fixedly connected to the outer edge surface of the screw (5) away from the limiting ring (4).

2. A ball screw mechanism according to claim 1, wherein: The screw (5) has a bearing (13) and an internal thread knob (14) passing through it on the side near the extrusion ring (7). The internal thread knob (14) is movably connected to the surface of the adjustment block (6) through the bearing (13). The inner wall of the internal thread knob (14) is threadedly connected to the outer edge surface of the screw (5).

3. The lead screw and nut mechanism according to claim 2, characterized in that: The adjustment block (6) has a telescopic plate (15) fixedly connected to the bottom surface of the side near the bearing (13), and the telescopic head of the telescopic plate (15) is fixedly connected to the outer edge of the screw (5) through the fixing block (16).

4. The lead screw and nut mechanism according to claim 1, characterized in that: The spring constant of spring A (19) is less than that of spring B (23).

5. A lead screw and nut mechanism according to claim 1, characterized in that: The size of the port on the side of the limiting slider (8) away from the slide rail (9) is the same as the size of the assembly port (17).

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