Pin connecting structure applied to multi-stage lead screw

Abstract

The utility model provides a pin connection structure applied to a multistage lead screw, which comprises at least one stage lead screw, a first-stage nut, a first-stage sleeve and a second-stage sleeve, the first-stage lead screw is in threaded connection with the first-stage nut, the second-stage sleeve is sleeved on the outer side of the first-stage lead screw and the first-stage nut, and the second-stage sleeve is sleeved on the outer side of the second-stage nut. The first-stage sleeve is arranged on the outer side of the second-stage sleeve in a sleeving mode, the first-stage sleeve is connected with the second-stage sleeve through a key groove, and the first-stage nut is connected with the second-stage sleeve through a pin; when the first-stage lead screw rotates relative to the first-stage sleeve, the first-stage nut moves in the axial direction of the first-stage lead screw, and the first-stage nut pushes the second-stage sleeve to stretch out and draw back in the axial direction of the first-stage lead screw. According to the utility model, a pin structure is adopted to replace threaded connection, so that the problem of looseness under vibration or impact load is effectively avoided, and the connection stability is improved.

Description

Technical Field

[0001] This utility model relates to the field of lead screw device technology, specifically to a pin connection structure applied in multi-stage lead screws. Background Technology

[0002] In existing multi-stage lead screw systems, the connection between the nut and sleeve is typically a threaded connection. However, under high vibration or load fluctuation environments, threaded connections may loosen, thus affecting system reliability. While improvements can be made by using anti-loosening methods such as threadlocker, these measures not only have limited temperature resistance but also increase the complexity of assembly and maintenance.

[0003] Therefore, this utility model provides a pin connection structure for use in multi-stage lead screws, which can effectively improve the connection stability of the device and is suitable for mechanical systems with high reliability requirements. Utility Model Content

[0004] In view of the deficiencies in the existing technology, the purpose of this utility model is to provide a multi-stage lead screw connection structure that can effectively improve the connection stability of the device.

[0005] The pin connection structure for use in multi-stage lead screws provided by this utility model includes at least a primary lead screw, a primary nut, a primary sleeve, and a secondary sleeve. The primary lead screw and the primary nut are threadedly connected. The secondary sleeve is sleeved on the outside of the primary lead screw and the primary nut. The primary sleeve is sleeved on the outside of the secondary sleeve. The primary sleeve and the secondary sleeve are keyway connected. The primary nut and the secondary sleeve are pin-connected. When the primary lead screw rotates relative to the primary sleeve, the primary nut moves along the axial direction of the primary lead screw, and the primary nut pushes the secondary sleeve to extend and retract along the axial direction of the primary lead screw.

[0006] Preferably, the number of pins is at least two, and the pins are evenly distributed along the circumference of the primary nut.

[0007] Furthermore, positioning holes are provided on the circumference of the primary nut and on the side wall of the secondary sleeve.

[0008] Preferably, the pin is cylindrical, square, or conical in shape.

[0009] Preferably, the pin is installed in a pluggable or self-locking manner.

[0010] Furthermore, it also includes a secondary lead screw, a secondary nut, and a tertiary sleeve. The secondary lead screw is sleeved on the outside of the primary lead screw, and the secondary lead screw and the secondary nut are threaded together. The tertiary sleeve is sleeved on the outside of the secondary lead screw and the secondary nut, and the tertiary sleeve is located on the inside of the secondary sleeve. The tertiary sleeve and the secondary sleeve are keyway connected. The secondary nut and the tertiary sleeve are pin connected. The secondary lead screw can rotate with the primary lead screw.

[0011] Furthermore, the secondary lead screw is connected to the keyway of the primary lead screw.

[0012] Furthermore, one end of the secondary lead screw is rotatably connected to the primary nut, so that the secondary lead screw rises and falls with the primary nut.

[0013] Preferably, bearings are provided between the primary lead screw and the primary sleeve, between the primary nut and the secondary lead screw, and between the secondary lead screw and the secondary sleeve.

[0014] Preferably, it also includes an n-stage lead screw, an n-stage nut, and an n+1-stage sleeve, where n is an integer greater than 2.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] This utility model provides a pin connection structure for use in multi-stage lead screws, offering reliable connection. The pin structure effectively prevents thread loosening under vibration or impact loads, improving connection stability. The pluggable or self-locking design of the pin simplifies and speeds up assembly and disassembly, reducing maintenance costs. This utility model has a wide range of applications, overcoming the limitations of thread-locking adhesives in high-temperature, frequent disassembly, or special environments, making it more suitable for high-precision machinery and special working conditions. Attached Figure Description

[0017] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0018] Figure 1 This is a schematic diagram of the pin connection structure applied to a multi-stage lead screw according to an embodiment of the present invention.

[0019] Among them, 1-first-stage lead screw, 2-first-stage connecting pin, 3-first-stage nut, 4-second-stage connecting pin, 5-second-stage nut, 6-second-stage lead screw, 7-first-stage sleeve, 8-second-stage sleeve, and 9-third-stage sleeve. Detailed Implementation

[0020] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0021] This utility model provides a pin connection structure for use in multi-stage lead screws, in which the nut of each stage is connected to the sleeve of the next stage by a pin, which effectively improves the connection stability of the device and has the characteristics of preventing loosening, high reliability, wide temperature range and simple maintenance.

[0022] like Figure 1 As shown, the pin connection structure applied in a multi-stage lead screw in this embodiment includes a primary lead screw 1, a primary nut 3, a primary sleeve 7, and a secondary sleeve 8. The primary lead screw 1 is located at the center, and the primary nut 3 is sleeved on the primary lead screw 1. The two are connected by threads, and when the primary lead screw 1 rotates, the primary nut 3 can move along the axial direction of the primary lead screw 1. The secondary sleeve 8 is sleeved on the outside of the primary lead screw 1 and the primary nut 3, and is connected to the primary nut 3. The primary nut 3 drives the secondary sleeve 8, realizing the raising and lowering of the secondary sleeve 8. The primary sleeve 7 is sleeved on the outermost side and fixed, which not only encapsulates the multi-stage lead screw but also allows the primary lead screw 1 to rotate relative to the primary sleeve 7. The primary sleeve 7 and the secondary sleeve 8 are keyway fitted, allowing them to slide relative to each other axially without any relative movement in the circumferential direction. The secondary sleeve 8 further restricts the circumferential movement of the primary nut 3, so that when the primary screw 1 rotates, the primary nut 3 can move along the axial direction of the primary screw 1. The primary nut 3 then pushes the secondary sleeve 8 to move, thus realizing the extension and retraction of the secondary sleeve 8.

[0023] In this embodiment, the primary nut 3 and the secondary sleeve 8 are connected by a primary connecting pin 2 to achieve a stable connection. Specifically, positioning holes are provided on the circumference of the primary nut 3 and the side wall of the secondary sleeve 8. The primary connecting pin 2 is inserted into the positioning holes to achieve a pin connection between the primary nut 3 and the secondary sleeve 8. The shape of the primary connecting pin 2 can be cylindrical, conical, square, or other special shapes as needed to meet the strength and reliability requirements of different application scenarios. The primary connecting pin 2 can be installed using a pluggable or self-locking structure, making assembly and disassembly more convenient and reducing maintenance costs.

[0024] The number of primary connecting pins 2 is at least two, evenly distributed circumferentially around the primary nut 3 to ensure uniform force distribution and stability of the lead screw system. In this embodiment, the number of primary connecting pins 2 is four. To improve the overall connection strength, the distribution of the primary connecting pins 2 can be optimized, and does not necessarily have to be uniform.

[0025] like Figure 1 As shown, the pin connection structure applied in the multi-stage lead screw of this embodiment also includes a secondary lead screw 6, a secondary nut 5, and a tertiary sleeve 9. The secondary lead screw 6 is sleeved outside the primary lead screw 1, and the secondary nut 5 is threadedly connected to the secondary lead screw 6. The tertiary sleeve 9 is located outside the secondary lead screw 6 and the secondary nut 5, and inside the secondary sleeve 8. Similar to the previous sleeve structure, the tertiary sleeve 9 is connected to the secondary sleeve 8 via a keyway, and the secondary nut 5 is connected to the tertiary sleeve 9 via a secondary connecting pin 4. The secondary lead screw 6 and the primary lead screw 1 are keyway-fitted, allowing the secondary lead screw 6 to rotate together with the primary lead screw 1. The secondary nut 5 then moves axially along the secondary lead screw 6, driving the tertiary sleeve 9 to rise and fall, thus achieving synchronous rising and falling of the secondary sleeve 8 and the tertiary sleeve 9.

[0026] In one specific embodiment, one end of the secondary lead screw 6 is connected to the primary nut 3 in a grooved manner, so that while the secondary lead screw 6 rotates relative to the primary nut 3, it is also pulled by the primary nut 3, achieving synchronous lifting and lowering of the secondary lead screw 6 and the primary nut 3. At this time, the lifting and lowering of the secondary nut 5 is affected by the combined action of the lifting and lowering of the secondary lead screw 6 and the rotation of the secondary lead screw 6. Because the tertiary sleeve 9 is affected by the combined action of the secondary lead screw 6 and the secondary nut 5, the extension and retraction range of the tertiary sleeve 9 is greater than that of the secondary sleeve 8. The secondary connecting pin 4 and the primary connecting pin 2 can adopt the same structural form, number, and distribution.

[0027] To reduce friction, bearings can be installed between relatively rotating parts. For example, bearings can be installed between the first-stage lead screw 1 and the first-stage sleeve 7, between the first-stage nut 3 and the second-stage lead screw 6, and between the second-stage lead screw 6 and the second-stage sleeve 8 to facilitate rotation between the parts.

[0028] In other embodiments, three-level, four-level, and more-level lead screws, nuts, and sleeves can be provided. The type and connection method of each level of lead screw, nut, and sleeve are roughly the same as those of the second-level lead screw 6, the second-level nut 5, and the third-level sleeve 9. The connection method between each level of lead screw, nut, and sleeve structure and the previous level structure is also equivalent to the connection method between the second-level structure and the first-level structure.

[0029] The specific implementation process of the pin connection structure applied to the multi-stage lead screw in this embodiment is as follows: a connecting pin is inserted into four evenly distributed positioning holes at the connection position between each nut and the next stage sleeve. When the first stage lead screw rotates, it drives the next stage lead screw to rotate together through the keyway. When each nut moves on the same stage lead screw, it drives the next stage sleeve to move through the connecting pin, thereby realizing the lifting function of the multi-stage lead screw.

[0030] The pin connection structure of this invention, applied to multi-stage lead screws, can effectively avoid the loosening problem of traditional threaded connections under vibration or impact loads, and provides higher connection stability.

[0031] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A pin connection structure applied in a multi-stage lead screw, characterized in that, It includes at least a primary lead screw, a primary nut, a primary sleeve, and a secondary sleeve. The primary lead screw and the primary nut are threadedly connected. The secondary sleeve is sleeved on the outside of the primary lead screw and the primary nut. The primary sleeve is sleeved on the outside of the secondary sleeve. The primary sleeve and the secondary sleeve are keyway connected. The primary nut and the secondary sleeve are pin connected. When the primary lead screw rotates relative to the primary sleeve, the primary nut moves along the axial direction of the primary lead screw, and the primary nut pushes the secondary sleeve to extend and retract along the axial direction of the primary lead screw.

2. The pin connection structure applied to a multi-stage lead screw according to claim 1, characterized in that, The number of pins is at least two, and the pins are evenly distributed along the circumference of the primary nut.

3. The pin connection structure applied to a multi-stage lead screw according to claim 2, characterized in that, The primary nut has circumferential positioning holes, and the secondary sleeve has positioning holes on its sidewall.

4. The pin connection structure applied to a multi-stage lead screw according to claim 3, characterized in that, The pin can be cylindrical, square, or conical in shape.

5. The pin connection structure applied to a multi-stage lead screw according to claim 3, characterized in that, The pin can be installed in a pluggable or self-locking manner.

6. The pin connection structure applied to a multi-stage lead screw according to claim 1, characterized in that, It also includes a secondary lead screw, a secondary nut, and a tertiary sleeve. The secondary lead screw is sleeved on the outside of the primary lead screw, and the secondary lead screw and the secondary nut are threaded together. The tertiary sleeve is sleeved on the outside of the secondary lead screw and the secondary nut, and the tertiary sleeve is located on the inside of the secondary sleeve. The tertiary sleeve and the secondary sleeve are keyway connected. The secondary nut and the tertiary sleeve are pin connected. The secondary lead screw can rotate with the primary lead screw.

7. The pin connection structure applied to a multi-stage lead screw according to claim 6, characterized in that, The secondary lead screw is connected to the keyway of the primary lead screw.

8. The pin connection structure applied to a multi-stage lead screw according to claim 6, characterized in that, One end of the secondary lead screw is rotatably connected to the primary nut, so that the secondary lead screw rises and falls with the primary nut.

9. The pin connection structure applied to a multi-stage lead screw according to claim 8, characterized in that, Bearings are respectively provided between the primary lead screw and the primary sleeve, between the primary nut and the secondary lead screw, and between the secondary lead screw and the secondary sleeve.

10. The pin connection structure applied to a multi-stage lead screw according to claim 6, characterized in that, It also includes n-stage lead screws, n-stage nuts, and n+1-stage sleeves, where n is an integer greater than 2.

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