A telescoping device

Abstract

The application discloses a telescopic device, which comprises an output shaft and a transmission mechanism, wherein the transmission mechanism comprises a transmission sleeve, a transmission outer ring, a transmission inner ring and a rotating body, one end of the transmission outer ring is provided with an annular mounting groove, the other end of the transmission outer ring is provided with an annular protruding part, and the annular protruding part is provided with a first internal thread; the transmission inner ring is arranged in the annular mounting groove, and the transmission inner ring is rotationally matched with the transmission outer ring through the rotating body; one end of the transmission sleeve is connected with the transmission inner ring, and the inner wall of the transmission sleeve is provided with a first guide key; the output shaft is movably arranged in the transmission sleeve, a first guide groove matched with the first guide key is formed in the surface of the output shaft along the axial direction of the output shaft, and the surface of the output shaft is provided with a first external thread. The output shaft and the annular protruding part are connected in a threaded mode, the telescopic device has the physical characteristics of mechanical failure self-locking, has the advantages of simple and compact structure, high telescopic control precision, good safety, low use cost and high practicability.

Description

Technical Field

[0001] This invention belongs to the field of telescopic equipment technology, and specifically relates to a telescopic device. Background Technology

[0002] Telescopic devices are required in fields such as lifting and hoisting equipment and manned lifting platforms. Currently, lifting and hoisting equipment and manned lifting platforms generally use wire ropes, chains or hydraulic cylinders as lifting transmission mechanisms. Their structure is simple and easy to use, but their telescopic accuracy cannot be precisely controlled. There are also telescopic devices that use screw drives. For example, Chinese patent CN110778676A discloses a multi-stage synchronous telescopic arm based on screw drive. The load-bearing section is connected to the guide rail slider and screw nut fixing seat of the last telescopic intermediate section. The current telescopic intermediate section is connected to the guide rail slider and screw nut fixing seat of the previous telescopic intermediate section or the first-stage telescopic drive section. The motor of the first-stage telescopic drive section drives the large bevel gear and the small bevel gear to mesh and transmit rotation to the screw. The screw drives the screw nut and the first-stage telescopic intermediate section to move. The large plane transmission gear of the first-stage telescopic intermediate section meshes with the rack of the first-stage telescopic drive section and rotates. The large plane transmission gear meshes with the small plane transmission gear to change direction and speed. The small plane transmission gear rotates coaxially with the large bevel gear. The large bevel gear and the small bevel gear mesh to transmit rotation to the screw. The screw drives the next-stage telescopic intermediate section or the load-bearing section to move. It has the advantages of synchronous and rapid telescopic extension and retraction, good rigidity, high transmission efficiency, high precision, arbitrary level expansion, and good self-locking performance. Although this multi-stage synchronous telescopic boom has high telescopic control precision, it requires more parts due to its gear transmission, making telescopic control complex and resulting in higher operating costs. Summary of the Invention

[0003] The purpose of this invention is to provide a telescopic device to solve the aforementioned problems existing in the prior art.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a telescopic device, comprising an output shaft and a transmission mechanism, wherein the transmission mechanism comprises a transmission sleeve, an outer transmission ring, an inner transmission ring, and a rotating body; one end of the outer transmission ring is provided with an annular mounting groove, and the other end of the outer transmission ring is provided with an annular protrusion extending into the inner part of the outer transmission ring, the annular protrusion being provided with a first internal thread; the inner transmission ring is disposed within the annular mounting groove, and the inner transmission ring and the outer transmission ring are rotatably engaged through the rotating body; one end of the transmission sleeve is connected to the inner transmission ring, and the inner wall of the transmission sleeve is provided with a first guide key; the output shaft is movably disposed within the transmission sleeve, and the surface of the output shaft is provided with a first guide groove adapted to the first guide key along its axial direction, and the surface of the output shaft is provided with a first external thread adapted to the first internal thread.

[0005] As an optional design structure of the above technical solution, the telescopic device includes a multi-stage transmission mechanism. Each stage of the transmission mechanism has a second guide groove on its axial surface of the transmission sleeve. Each stage of the transmission mechanism also has a second external thread that matches the first internal thread. The transmission sleeve of the next stage transmission mechanism is movably disposed within the transmission sleeve of the previous stage transmission mechanism. The second guide groove of the transmission sleeve of the next stage transmission mechanism cooperates with the first guide key of the transmission sleeve of the previous stage transmission mechanism. The second external thread of the transmission sleeve of the next stage transmission mechanism cooperates with the first internal thread of the annular protrusion of the previous stage transmission mechanism. The transmission sleeve of the primary transmission mechanism is connected to a power input mechanism, and the output shaft is movably disposed within the transmission sleeve of the final stage transmission mechanism.

[0006] As an optional design structure of the above technical solution, the power input mechanism includes a power input shaft, a power sleeve, and a power outer ring. The power input shaft is connected to the power sleeve. The inner wall of the power sleeve is provided with a second guide key, and the power outer ring is provided with a second internal thread. The transmission sleeve of the primary transmission mechanism is movably disposed inside the power sleeve. The second guide groove of the transmission sleeve of the primary transmission mechanism cooperates with the second guide key of the power sleeve. The second external thread of the transmission sleeve of the primary transmission mechanism cooperates with the second internal thread of the power outer ring.

[0007] As an optional design structure of the above technical solution, the power sleeve is equipped with a first protective shell, which is sleeved on the outside of the power sleeve and connected to the outer ring of the power sleeve.

[0008] As an optional design structure of the above technical solution, the transmission sleeve is equipped with a second protective shell, which is sleeved on the outside of the transmission sleeve and connected to the outer ring of the transmission. The first protective shell is provided with a first storage groove that is adapted to the second protective shell.

[0009] As an optional design structure of the above technical solution, the size of the first storage slot matches the size of the second protective shell, so as to guide the second protective shell into the first storage slot.

[0010] As an optional design structure of the above technical solution, the second protective shell is provided with a second storage groove, and the second protective shell of the subsequent transmission mechanism can extend into the second storage groove of the second protective shell of the preceding transmission mechanism.

[0011] As an optional design structure of the above technical solution, the cross-sections of both the first guide key and the second guide key are rectangular.

[0012] As an optional design structure of the above technical solution, the inner wall of the transmission outer ring is provided with a first annular groove adapted to the rotating body, and the outer wall of the transmission inner ring is provided with a second annular groove adapted to the rotating body.

[0013] As an optional design structure of the above technical solution, the rotating body includes a ball bearing, which is disposed between the first annular groove and the second annular groove.

[0014] As an optional design structure of the above technical solution, the transmission outer ring and the annular protrusion are integrally formed.

[0015] The beneficial effects of this invention are as follows:

[0016] This invention provides a telescopic device. An inner transmission ring is disposed within an annular mounting groove, and the inner and outer transmission rings are rotatably engaged via a rotating body. One end of a transmission sleeve is connected to the inner transmission ring, and a first guide key is provided on the inner wall of the transmission sleeve. An output shaft is movably disposed within the transmission sleeve, and a first guide groove adapted to the first guide key is formed along its axial direction on the surface of the output shaft. A first external thread adapted to a first internal thread is also formed on the surface of the output shaft. In this invention, the transmission sleeve can rotate, and under the action of the first guide key and the first guide groove, the output shaft can rotate together with the transmission sleeve. Due to the threaded engagement between the output shaft and the annular protrusion, the first guide key and the first guide groove can slide relative to each other during rotation, achieving the axial telescopic function of the output shaft. The output shaft and the annular protrusion of this invention are connected by a thread, which possesses the physical characteristic of self-locking in the event of mechanical failure. Furthermore, it has a simple and compact structure, high telescopic control precision, good safety, low operating cost, and high practicality. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the telescopic device in one embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the telescopic device in one embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the telescopic device in one embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of the transmission sleeve in one embodiment of the present invention.

[0021] Figure 5 This is a schematic diagram of the structure of the outer transmission ring and the inner transmission ring in one embodiment of the present invention.

[0022] In the diagram: 1-output shaft; 2-transmission sleeve; 3-transmission outer ring; 4-transmission inner ring; 5-rotating body; 6-first guide key; 7-power input shaft; 8-power sleeve; 9-power outer ring; 10-first protective shell; 11-second protective shell; 12-third protective shell. Detailed Implementation

[0023] Example

[0024] like Figures 1-5 As shown, this embodiment provides a telescopic device, mainly including an output shaft 1 and a transmission mechanism. The transmission mechanism includes a transmission sleeve 2, a transmission outer ring 3, a transmission inner ring 4, and a rotating body 5. One end of the transmission outer ring 3 is provided with an annular mounting groove, which communicates with the interior of the transmission outer ring 3. The other end of the transmission outer ring 3 is provided with an annular protrusion extending into the interior of the transmission outer ring 3, and the annular protrusion is provided with a first internal thread. The transmission outer ring 3 and the annular protrusion adopt an integral molding structure design to ensure its structural stability.

[0025] like Figure 5 As shown, the inner transmission ring 4 is disposed within the annular mounting groove, and the inner transmission ring 4 and the outer transmission ring 3 are rotatably engaged by multiple rotating bodies 5. An annular gap exists between the inner transmission ring 4 and the outer transmission ring 3, and the multiple rotating bodies 5 are disposed within this annular gap, allowing the outer transmission ring 3 and the inner transmission ring 4 to rotate relative to each other, forming a structure similar to a bearing. Figure 4 As shown, one end of the transmission sleeve 2 is connected to the transmission inner ring 4, and the inner wall of the transmission sleeve 2 is provided with a first guide key 6; the output shaft 1 is movably disposed in the transmission sleeve 2, and the surface of the output shaft 1 is provided with a first guide groove adapted to the first guide key 6 along its axial direction, and the surface of the output shaft 1 is provided with a first external thread adapted to the first internal thread.

[0026] One end of the transmission sleeve 2 can be directly connected to an external power input mechanism, and the other end of the transmission sleeve 2 extends into the inner transmission ring 4 and is fixedly connected to the inner transmission ring 4. The output shaft 1 is sleeved inside the transmission sleeve 2, and one end of the output shaft 1 extends out of the transmission sleeve 2 and is threadedly engaged with the annular protrusion of the outer transmission ring 3. The first guide key 6 on the inner wall of the transmission sleeve 2 is slidably engaged with the first guide groove on the outer wall of the output shaft 1, allowing the output shaft 1 to slide axially relative to the transmission sleeve 2. The first external thread on the surface of the output shaft 1 is threadedly engaged with the first internal thread of the annular protrusion of the outer transmission ring 3, allowing the output shaft 1 to rotate relative to the outer transmission ring 3.

[0027] In practical applications, this telescopic device can be mounted on a sliding platform. The outer transmission ring 3 can move horizontally but cannot rotate. The end of the output shaft 1 is connected to moving components such as the lifting platform plate. The power input mechanism drives the transmission sleeve 2 to rotate. Under the cooperation of the first guide key 6 and the first guide groove, the output shaft 1 can rotate together with the transmission sleeve 2. Because the output shaft 1 is threadedly engaged with the annular protrusion, the first guide key 6 and the first guide groove can slide relative to each other during the rotation of the output shaft 1, realizing the axial telescopic function of the output shaft 1. The output shaft 1 and the annular protrusion of the outer transmission ring 3 of this invention adopt a threaded engagement, which has the physical characteristic of self-locking in the event of mechanical failure. Moreover, it has a simple and compact structure, high telescopic control accuracy, good safety, low operating cost, and high practicality.

[0028] In this embodiment, the inner wall of the outer transmission ring 3 is provided with a first annular groove adapted to the rotating body 5, and the outer wall of the inner transmission ring 4 is provided with a second annular groove adapted to the rotating body 5. The rotating body 5 includes ball bearings, which are disposed between the first and second annular grooves. Both the first and second annular grooves are semi-circular arc-shaped, and multiple ball bearings are disposed between the first and second annular grooves to realize the relative rotation function of the outer transmission ring 3 and the inner transmission ring 4.

[0029] like Figure 2 and 3 As shown, as an optional solution, the telescopic device includes a multi-stage transmission mechanism. Each stage of the transmission mechanism has a second guide groove on its axial surface of the transmission sleeve 2, and each stage of the transmission sleeve 2 has a second external thread that matches the first internal thread. The transmission sleeve 2 of the next stage transmission mechanism is movably disposed within the transmission sleeve 2 of the previous stage transmission mechanism. The second guide groove of the transmission sleeve 2 of the next stage transmission mechanism cooperates with the first guide key 6 of the transmission sleeve 2 of the previous stage transmission mechanism. The second external thread of the transmission sleeve 2 of the next stage transmission mechanism cooperates with the first internal thread of the annular protrusion of the outer ring 3 of the previous stage transmission mechanism. The transmission sleeve 2 of the primary transmission mechanism is connected to a power input mechanism, and the output shaft is movably disposed within the transmission sleeve 2 of the final stage transmission mechanism.

[0030] It should be noted that the multi-stage transmission mechanism can be a two-stage or three-stage or higher transmission mechanism. The transmission mechanism connected to the power input mechanism serves as the primary transmission mechanism, and the transmission mechanism connected to the output shaft 1 serves as the final stage transmission mechanism. Adjacent transmission mechanisms are connected in a transmission manner. The power input mechanism can be implemented using electric equipment, fuel-powered equipment, or manually driven equipment (hand crank), such as a motor connected to the transmission sleeve 2 of the primary transmission mechanism via a coupling. The power input mechanism can drive the transmission sleeves 2 of each stage of the transmission mechanism to rotate simultaneously. Moreover, under the cooperation of the second guide groove and the first guide key 6, each transmission sleeve 2 and the output shaft 1 can extend and retract synchronously, realizing the extension and retraction control function of the output shaft 1. The telescopic device of this invention adopts a multi-stage transmission mechanism for synchronous extension and retraction, which has the advantages of compact structure, rapid synchronous extension and retraction, arbitrary level expansion, high telescopic control accuracy, simple control and easy maintenance, high transmission efficiency, and good self-locking performance, greatly improving the safety factor during the lifting process.

[0031] In one embodiment, the power input mechanism includes a power input shaft 7, a power sleeve 8, and a power outer ring 9. The power input shaft 7 is fixedly connected to the power sleeve 8. The inner wall of the power sleeve 8 is provided with a second guide key, and the power outer ring 9 is provided with a second internal thread. The transmission sleeve 2 of the primary transmission mechanism is movably disposed within the power sleeve 8. The second guide groove of the transmission sleeve 2 of the primary transmission mechanism cooperates with the second guide key of the power sleeve 8, and the second external thread of the transmission sleeve 2 of the primary transmission mechanism cooperates with the second internal thread of the power outer ring 9. Typically, the cross-sections of the first guide key 6 and the second guide key are both rectangular, and correspondingly, the cross-sections of the first guide groove and the second guide groove are also rectangular. The power outer ring 9 remains fixed, and the transmission outer rings 3 of each stage of the transmission mechanism can move parallel to the transmission sleeve 2. An external motor is connected to the power input shaft 7, and the motor drives the power input shaft 7 and the power sleeve 8 to rotate. The transmission sleeves 2 and the output shaft 1 of each stage of the transmission mechanism can rotate and extend synchronously, realizing the extension and retraction control function of the output shaft 1.

[0032] like Figure 3As shown, preferably, the power sleeve 8 is equipped with a first protective shell 10, which is sleeved on the outside of the power sleeve 8 and fixedly connected to the power outer ring 9. The first protective shell 10 provides protection for the power sleeve 8. Each stage of the transmission mechanism's transmission sleeve 2 is equipped with a second protective shell 11, which is sleeved on the outside of the transmission sleeve 2 and fixedly connected to the transmission outer ring 3. The first protective shell 10 has a first receiving groove adapted to the second protective shell 11. When the output shaft 1 retracts, the second protective shell 11 can extend into the first receiving groove of the first protective shell 10. Furthermore, the size of the first receiving groove matches the size of the second protective shell 11, and the first receiving groove has a guiding function, guiding the second protective shell 11 into the first receiving groove. The second protective shell 11 has a second receiving groove, allowing the second protective shell 11 of the subsequent stage transmission mechanism to extend into the second receiving groove of the second protective shell 11 of the preceding stage transmission mechanism. Optionally, the output end of the output shaft 1 is connected to a bearing, the inner ring of which is fixedly connected to the end of the output shaft 1, and the outer ring of the bearing is connected to a third protective shell 12. The third protective shell 12 provides protection for the output shaft 1. When the output shaft 1 is retracted, the third protective shell 12 can extend into the second receiving groove of the second protective shell 11 of the final stage transmission mechanism.

[0033] In the description of this invention, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. They can refer to fixed connections, detachable connections, or integral connections; they can be mechanical or electrical connections; they can be direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this invention. Furthermore, the specific features and structures described in the embodiments are included in at least one implementation method. Those skilled in the art can combine features from different implementation methods without contradiction. The scope of protection of this invention is not limited to the specific implementation methods described above. Based on the basic technical concept of this invention, implementation methods that can be conceived by those skilled in the art without creative effort are all within the scope of protection of this invention.

Claims

1. A telescopic device, characterized in that, The device includes an output shaft (1) and a transmission mechanism. The transmission mechanism includes a transmission sleeve (2), an outer transmission ring (3), an inner transmission ring (4), and a rotating body (5). One end of the outer transmission ring (3) is provided with an annular mounting groove, and the other end of the outer transmission ring (3) is provided with an annular protrusion extending into the inner part of the outer transmission ring (3). The annular protrusion is provided with a first internal thread. The inner transmission ring (4) is disposed in the annular mounting groove, and the inner transmission ring (4) and the outer transmission ring (3) are rotatably engaged by the rotating body (5). One end of the transmission sleeve (2) is connected to the inner transmission ring (4), and the inner wall of the transmission sleeve (2) is provided with a first guide key (6). The output shaft (1) is movably disposed in the transmission sleeve (2). The surface of the output shaft (1) is provided with a first guide groove adapted to the first guide key (6) along its axial direction, and the surface of the output shaft (1) is provided with a first external thread adapted to the first internal thread. The inner wall of the transmission outer ring (3) is provided with a first annular groove adapted to the rotating body (5), and the outer wall of the transmission inner ring (4) is provided with a second annular groove adapted to the rotating body (5); the rotating body (5) includes a ball, which is disposed between the first annular groove and the second annular groove.

2. The telescopic device according to claim 1, characterized in that, The telescopic device includes a multi-stage transmission mechanism. The transmission sleeve (2) of each stage of the transmission mechanism has a second guide groove on its axial direction. The transmission sleeve (2) of each stage of the transmission mechanism is provided with a second external thread that matches the first internal thread. The transmission sleeve (2) of the next stage of the transmission mechanism is movably disposed in the transmission sleeve (2) of the previous stage of the transmission mechanism. The second guide groove of the transmission sleeve (2) of the next stage of the transmission mechanism cooperates with the first guide key (6) of the transmission sleeve (2) of the previous stage of the transmission mechanism. The second external thread of the transmission sleeve (2) of the next stage of the transmission mechanism cooperates with the first internal thread of the annular protrusion of the previous stage of the transmission mechanism. The transmission sleeve (2) of the primary transmission mechanism is connected to a power input mechanism, and the output shaft is movably disposed in the transmission sleeve (2) of the final stage of the transmission mechanism.

3. The telescopic device according to claim 2, characterized in that, The power input mechanism includes a power input shaft (7), a power sleeve (8), and a power outer ring (9). The power input shaft (7) is connected to the power sleeve (8). The inner wall of the power sleeve (8) is provided with a second guide key. The power outer ring (9) is provided with a second internal thread. The transmission sleeve (2) of the primary transmission mechanism is movably disposed inside the power sleeve (8). The second guide groove of the transmission sleeve (2) of the primary transmission mechanism cooperates with the second guide key of the power sleeve (8). The second external thread of the transmission sleeve (2) of the primary transmission mechanism cooperates with the second internal thread of the power outer ring (9).

4. The telescopic device according to claim 3, characterized in that, The power sleeve (8) is equipped with a first protective shell (10), which is sleeved on the outside of the power sleeve (8) and connected to the power outer ring (9).

5. The telescopic device according to claim 4, characterized in that, The transmission sleeve (2) is equipped with a second protective shell (11), which is sleeved on the outside of the transmission sleeve (2) and connected to the transmission outer ring (3). The first protective shell (10) is provided with a first storage groove that is adapted to the second protective shell (11).

6. The telescopic device according to claim 5, characterized in that, The size of the first storage slot matches the size of the second protective shell (11) to guide the second protective shell (11) into the first storage slot.

7. The telescopic device according to claim 5, characterized in that, The second protective shell (11) is provided with a second storage groove, and the second protective shell (11) of the subsequent transmission mechanism can extend into the second storage groove of the second protective shell (11) of the preceding transmission mechanism.

8. The telescopic device according to claim 3, characterized in that, The cross-sections of the first guide key (6) and the second guide key are both rectangular.

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