Double-screw two-gear self-locking structure

Abstract

The application discloses a double-screw-rod two-gear self-locking structure and belongs to the technical field of self-locking structures. The structure has two self-locking gears and comprises a driving part, a transmission gear set and a locking mechanism. The driving part is in transmission connection with the moving part and the locking mechanism respectively. The transmission gear set has an intermittent transmission characteristic and is used for driving the moving part to switch between the two gears. The locking mechanism comprises a screw rod transmission gear, a first screw rod, a second screw rod and a sliding mechanism. The sliding mechanism is provided with a first bolt and a second bolt which are in threaded connection with the two screw rods respectively. The two bolts are in connection with corresponding locking parts respectively, mechanical locking of the two gears is realized, the driving part serves as a single power source, in the gear shifting process, the driving part drives the corresponding bolt of the current gear to exit the locking first, then drives the moving part to switch positions, and finally drives the corresponding bolt of the target gear to enter the locking state, so that the two-gear switching and self-locking linkage of the moving part are realized. The application has the advantages of simple structure, low cost and high reliability.

Description

Technical Field

[0001] This invention belongs to the field of self-locking structure technology, and more specifically, relates to a double lead screw two-position self-locking structure. Background Technology

[0002] In devices such as gimbals, folding mechanisms, and rotating supports, it is often necessary to switch moving parts between two positions and reliably lock them in place after switching to prevent accidental swinging during transportation, storage, or operation. In existing technologies, common two-position locking methods typically use a separate drive element to control the extension and retraction of the pin to achieve locking and unlocking; or a scheme that uses one drive mechanism to drive the switching of the moving parts and another drive mechanism to drive the locking mechanism. Although the above solutions can achieve position locking, they generally have the disadvantages of requiring additional drive motors or actuators, resulting in complex structures; a large number of parts, increased overall size; higher costs, which is not conducive to product miniaturization; and complex control logic, making assembly and debugging more difficult. Therefore, a structure is needed that can achieve two-stage switching of moving parts and linkage with pin locking through a single drive source, in order to simplify the system, reduce costs and improve reliability. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a double lead screw two-speed self-locking structure, which can meet the requirements of two-speed switching and self-locking linkage under single power source drive.

[0004] This invention discloses a dual-screw, two-position self-locking structure with two self-locking positions. It includes a driving component and a locking mechanism. The driving component is connected to both an external moving component and the locking mechanism. The locking mechanism is used to lock the position of the moving component and includes at least two sets of corresponding locking elements and locking parts. The locking elements can engage or disengage with the locking parts to achieve locking and unlocking of the moving component when it is in the first and second positions. During the process of the moving part switching between the first gear and the second gear, the driving component first drives the locking component corresponding to the current position to exit the locking state, then drives the moving part to switch to another position, and then drives the locking component to lock the moving part in the other position.

[0005] As a further improvement of the present invention, the transmission gear set has intermittent transmission characteristics. Specifically, the transmission gear set includes a driving gear and a driven gear. The driving gear is fixedly connected to the output end of the stepper motor, and the driven gear is fixedly connected to the moving part. The driving gear and the driven gear are meshed. Both the driving gear and the driven gear adopt an incomplete gear structure, that is, only a portion of the circumference is provided with meshing teeth, and the remaining circumference is a toothless section, thereby forming an intermittent transmission relationship between the driving gear and the driven gear.

[0006] As a further improvement of the present invention, the locking mechanism includes a lead screw drive gear, a first lead screw, a second lead screw, and a sliding mechanism. The lead screw drive gear is connected to the output end of the drive component and is connected to the lead screw gears on the first and second lead screw drives, respectively. The locking component is provided in two parts, namely a first pin and a second pin, wherein the first pin is threadedly connected to the first lead screw, and the second pin is threadedly connected to the second lead screw. The first pin and the first lead screw can position and lock the transmission gear set or the moving part body, thereby allowing the moving part to enter or exit the locked state.

[0007] As a further improvement of the present invention, the locking part is provided in two parts, namely a first locking groove and a second locking groove. The first locking groove is provided on the driven gear, and the first pin can be inserted into or disengaged from the first locking groove. The second locking groove is provided on the moving part, and the second pin can be inserted into or disengaged from the second locking groove, so that the first pin and the first locking groove form a set, and the second pin and the second locking groove form two sets, so as to lock the moving part in the first gear position and the second gear position respectively.

[0008] As a further improvement of the present invention, it also includes a first bearing and a second bearing, wherein the first lead screw is connected to the first bearing, the second lead screw is connected to the second bearing, and one end of the output shaft of the drive component is provided with two rotating support members, wherein the first bearing and the second bearing are respectively rotatably installed in the two rotating support members.

[0009] As a further improvement of the present invention, the sliding mechanism also includes a slide rail, under the guidance of the slide rail. Specifically, the middle part of the slide rail is fixedly connected to the outer end of the output shaft of the drive member by a bearing. The slide rail is provided with two parallel guide rails, and the first pin and the second pin respectively cooperate to slide within the two guide rails.

[0010] As a further improvement of the present invention, the threads of the first lead screw and the second lead screw are opposite in direction, so that when the lead screw transmission gear drives them to rotate in the same direction, the first pin and the second pin can move in opposite or opposite linear directions along the extension direction of the slide rail.

[0011] Compared with existing technologies, the advantages of this invention are as follows: only one driving component is needed to simultaneously realize the gear switching of the moving parts and the locking and unlocking actions of the latch, eliminating the need for an additional independent locking drive source, which greatly simplifies the overall structure; reducing the number of motors and control components is beneficial for product miniaturization and weight reduction, while also reducing material and manufacturing costs; adopting a pure mechanical linkage structure, the control logic is simple, reducing electrical failure points and improving long-term reliability; control is achieved through the intermittent transmission characteristics of the transmission gear set, avoiding motion interference of the moving parts during the switching process. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the exploded structure of the present invention; Figure 3 This is an exploded view of the sliding mechanism and lead screw connection of the present invention; Figure 4 This is a bottom view of the outer casing of the present invention; Figure 5 This is a schematic diagram of the driven gear structure of the present invention; Figure 6 This is a schematic diagram of the moving part structure of the present invention; Figure 7 This is a schematic diagram of the first locking structure of the present invention; Figure 8 This is a schematic diagram of the second locking structure of the present invention; Figure 9 For the present invention Figure 8 A downward projection and a partially enlarged schematic diagram.

[0013] Explanation of the labels in the diagram: Drive component 1; Rotating support component 11; Lead screw transmission gear 2; First bearing 3; Second bearing 4; First lead screw 5; Second lead screw 6; Sliding mechanism 7; Slide rail 71; First pin 72; Second pin 73; Transmission gear set 8; Driving gear 81; Driven gear 82; First locking groove 821; Moving component 9; Second locking groove 91. Detailed Implementation

[0014] Specific Implementation Example 1: Please refer to... Figures 1-9 This invention relates to a double lead screw two-position self-locking structure, comprising a driving component 1, a lead screw transmission gear 2, a first bearing 3, a second bearing 4, a first lead screw 5, a second lead screw 6, a sliding mechanism 7, a transmission gear set 8, and a moving component 9. The driving component 1 is selected as a stepper motor. The output shaft of the driving component 1 is connected to the lead screw transmission gear 2. The lead screw transmission gear 2 is respectively connected to the lead screw gears at the outer ends of the first lead screw 5 and the second lead screw 6, thereby driving the first lead screw 5 and the second lead screw 6 to rotate synchronously. One end of the output shaft of the driving component 1 is provided with two rotating support members 11. The first bearing 3 and the second bearing 4 are respectively rotatably installed in the two rotating support members 11. The first lead screw 5 is connected to the first bearing 3, and the second lead screw 6 is connected to the second bearing 4 to ensure smooth rotation of the first lead screw 5 and the second lead screw 6.

[0015] like Figure 3As shown, the sliding mechanism 7 includes a slide rail 71, a first pin 72, and a second pin 73. The middle part of the slide rail 71 is fixedly connected to the outer end of the output shaft of the drive member 1 through a bearing. The slide rail 71 has two tracks at both ends of the bearing. The first pin 72 and the second pin 73 are respectively installed in the two tracks of the slide rail 71. The first pin 72 is threadedly connected to the first lead screw 5, and the second pin 73 is threadedly connected to the second lead screw 6. The first pin 72 and the second pin 73 are both guided and restricted by the slide rail 71, and can only slide linearly back and forth along the axis of the output shaft of the drive member 1. They cannot rotate synchronously with the first lead screw 5 or the second lead screw 6.

[0016] like Figure 2 As shown, the transmission gear set 8 includes a driving gear 81 and a driven gear 82. The driving gear 81 is fixedly connected to the output end of the drive member 1, and the driven gear 82 is fixedly connected to the moving member 9. The driving gear 81 and the driven gear 82 are meshed. When the driving gear 81 rotates, it can drive the driven gear 82 to rotate within the meshing range, thereby driving the moving member 9 to switch from the first gear position to the second gear position, or from the second gear position back to the first gear position.

[0017] In a further embodiment, such as Figure 2 As shown, the driving gear 81 and the driven gear 82 form an intermittent transmission relationship. Both the driving gear 81 and the driven gear 82 are incomplete gears, that is, the driving gear 81 and the driven gear 82 only have meshing teeth in a part of the circumferential range. The meshing teeth of the driving gear 81 and the driven gear 82 are correspondingly arranged, and the number of circumferential teeth of the two are the same. The two do not effectively mesh in the other circumferential range. When the driving member 1 drives the driving gear 81 to rotate, the driven gear 82 only rotates in a part of the angle range, while remaining stationary in the other angle range. The driven gear 82 is provided with a first locking groove 821, and the first pin 72 can be inserted into or disengaged from the first locking groove 821.

[0018] In a further embodiment, such as Figure 2 As shown, the first pin 72 is used to lock the moving part 9 in the first position, and the second pin 73 is used to lock the moving part 9 in the second position. The moving part 9 is provided with a corresponding locking groove 91. The second pin 73 can be inserted into or removed from the locking groove 91 to achieve mechanical locking.

[0019] It should be noted that the driven gear 82 and the slide rail 71 have external support, such as being connected to the housing, which makes it less likely to cause the gear to mesh with the driving gear 81 or to slip off the connection with the output end of the drive unit 1.

[0020] The working process of the two-position self-locking mechanism is as follows: like Figure 7As shown, when the mechanism is in the first locked position, the first pin 72 is in the extended position under the drive of the first lead screw 5 and is inserted into the first locking groove 821 on the driven gear 82. At this time, the second pin 73 is in the retracted position under the drive of the second lead screw 6 and is separated from the second locking groove 91 on the moving part 9. Since the first pin 72 is engaged with the first locking groove 821, the moving part 9 is locked relative to the transmission gear set 8 and cannot rotate, thereby keeping the moving part 9 stably in the first position. When it is necessary to switch the moving part 9 from the first gear position to the second gear position, when the drive part 1 starts to rotate, the output power of the drive part 1 is transmitted to the lead screw transmission gear 2 on the one hand and to the driving gear 81 in the transmission gear set 8 on the other hand. The lead screw transmission gear 2 drives the first lead screw 5 and the second lead screw 6 to rotate. In the initial stage, since the driving gear 81 and the driven gear 82 have not yet entered the effective meshing area, the driven gear 82 does not rotate, and the moving part 9 remains stationary. At the same time, the first lead screw 5 drives the first pin 72 to move in the direction of retraction from the first locking groove 821, thereby releasing the first gear lock. During the synchronous rotation, the second lead screw 6 drives the second pin 73 to move in the direction of approaching the second locking groove 91. At this time, the second pin 73 has not yet been inserted into the second locking groove 91 and is still in the preparatory stage. Entering the state; as the driving member 1 continues to rotate, the driving gear 81 enters the effective meshing area with the driven gear 82, and the driving gear 81 drives the driven gear 82 to rotate, thereby driving the moving member 9 to rotate from the first gear position to the second gear position. During this process, the first pin 72 remains disengaged to avoid interfering with the rotation of the moving member 9; the second pin 73 continues to approach the position of the second locking groove 91; when the moving member 9 reaches the second gear position, the driving gear 81 continues to rotate and disengages from the effective meshing area with the driven gear 82, causing the driven gear 82 to stop, and the moving member 9 stops at the second gear position. At this time, the driving member 1 continues to drive the first lead screw 5 and the second lead screw 6 to rotate, causing the second pin 73 to advance further and insert into the second locking groove 91, thereby completing the second gear locking.

[0021] like Figures 8-9 As shown, when it is necessary to return from the second gear to the first gear, the drive member 1 rotates in the reverse direction. In the initial stage of the return, the second lead screw 6 first drives the second pin 73 to move in the direction of disengaging from the second locking groove 91, so that the second pin 73 gradually exits the second locking groove 91, thereby releasing the second gear lock. At the same time, the drive gear 81 re-enters the effective engagement area, driving the driven gear 82 to rotate in the reverse direction, thereby driving the moving member 9 back to the first gear position. After the moving member 9 returns to the first gear position, the drive gear 81 exits the effective engagement area, and the driven gear 82 stops. The drive member 1 continues to drive the first lead screw 5 and the second lead screw 6 to rotate in the reverse direction, so that the first pin 72 advances and inserts into the first locking groove 821, thereby restoring the first gear mechanical lock and completing the return and self-locking process from the second gear to the first gear.

[0022] The key to this invention is that the driving component 1 serves as the sole power source, simultaneously driving the transmission gear set 8 and the locking mechanism. Through the intermittent transmission characteristics between the driving gear 81 and the driven gear 82, the rotational movement of the moving component 9 and the unlocking / locking movements of the first pin 72 and the second pin 73 are coordinated in time sequence. Specifically, when the drive gear 81 is in the non-effective engagement zone, the moving part 9 remains stationary. This stage is mainly used to disengage the current gear pin and pre-approach the target gear pin. After the drive gear 81 enters the effective engagement zone, the moving part 9 begins to rotate, thereby realizing gear switching. After the drive gear 81 disengages from the effective engagement zone, the moving part 9 stops again. This stage is used to complete the final insertion and locking of the target gear pin. This action sequence avoids mechanical interference between the pin and the moving part during the switching process and ensures that both gears can obtain a clear and reliable mechanical locking state after the switching is completed, thereby improving the stability, reliability and service life of the structure.

[0023] Furthermore, in this invention, the first lead screw 5 and the second lead screw 6 can be either structured with opposite thread directions or structured with the same thread direction but rotated in opposite directions through gear transmission, as long as the first pin 72 and the second pin 73 can move separately; the intermittent transmission structure between the driving gear 81 and the driven gear 82 is not limited to the form of an incomplete gear, and other equivalent structures that can realize the driving-stopping-re-driving action law can also be adopted.

Claims

1. A double-screw, two-position self-locking structure, characterized in that: It has two self-locking positions and includes a driving member (1) and a locking mechanism. The driving member (1) is connected to the locking mechanism and the external moving member (9) respectively. The locking mechanism is used to lock the position of the moving member (9). The locking mechanism includes at least two sets of corresponding locking members and locking parts. The locking members can cooperate with or separate from the locking parts to realize the locking and unlocking of the moving member (9) when it is in the first position and the second position. During the switching process between the first gear and the second gear of the moving part (9), the driving part (1) first drives the locking part corresponding to the current position to exit the locking state, then drives the moving part (9) to switch to another position, and then drives the locking part to lock the moving part (9) in the other position.

2. The double lead screw two-position self-locking structure according to claim 1, characterized in that: It also includes a transmission gear set (8), which has intermittent transmission characteristics. The transmission gear set (8) includes a driving gear (81) and a driven gear (82). The driving gear (81) is fixedly connected to the output end of the driving member (1), and the driven gear (82) is fixedly connected to the moving member (9). The driving gear (81) and the driven gear (82) mesh to transmit the kinetic energy of the driving member (1) to the moving member (9).

3. The double lead screw two-position self-locking structure according to claim 2, characterized in that: Both the driving gear (81) and the driven gear (82) adopt an incomplete gear structure. They are only provided with meshing teeth in a part of the circumference range, and are toothless in the rest of the circumference range, so that the driving gear (81) and the driven gear (82) form an intermittent transmission relationship.

4. The double lead screw two-position self-locking structure according to claim 2, characterized in that: The locking mechanism includes a lead screw drive gear (2), a first lead screw (5), a second lead screw (6), and a sliding mechanism (7). The lead screw drive gear (2) is connected to the output end of the drive member (1) and is connected to the lead screw gears on the first lead screw (5) and the second lead screw (6) respectively. The locking member is provided as two, namely a first pin (72) and a second pin (73). The first pin (72) is threadedly connected to the first lead screw (5), and the second pin (73) is threadedly connected to the second lead screw (6). The first pin (72) and the first lead screw (5) can position and lock the transmission gear set (8) or the moving part (9) body, so that the moving part (9) enters or exits the locked state.

5. The double lead screw two-position self-locking structure according to claim 4, characterized in that: The locking part is provided in two parts, namely a first locking groove (821) and a second locking groove (91). The first locking groove (821) is provided on the driven gear (82), and the first pin (72) can be inserted into or disengaged from the first locking groove (821). The second locking groove (91) is provided on the moving part (9), and the second pin (73) can be inserted into or disengaged from the second locking groove (91).

6. The double lead screw two-position self-locking structure according to claim 4, characterized in that: It also includes a first bearing (3) and a second bearing (4), a first lead screw (5) connected to the first bearing (3), and a second lead screw (6) connected to the second bearing (4).

7. The double lead screw two-position self-locking structure according to claim 1, characterized in that: Two rotating support members (11) are provided at one end of the output shaft of the drive member (1). The first bearing (3) and the second bearing (4) are respectively rotatably installed in the two rotating support members (11).

8. The double lead screw two-position self-locking structure according to claim 4, characterized in that: The sliding mechanism (7) includes a slide rail (71) connected to the output shaft of the drive (1) via a bearing, and a first pin (72) and a second pin (73) move under the guidance of the slide rail (71).

9. The double lead screw two-position self-locking structure according to claim 8, characterized in that: The slide rail (71) is provided with two parallel guide rails. The first pin (72) and the second pin (73) slide in the two guide rails respectively. The middle part of the slide rail (71) is fixedly connected to the outer end of the output shaft of the drive member (1) through a bearing.

10. The double lead screw two-position self-locking structure according to claim 4, characterized in that: The first lead screw (5) and the second lead screw (6) have opposite thread directions.

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