Lifting curtain locking mechanism and lifting curtain

Abstract

The utility model discloses a kind of lifting curtain locking mechanism and lifting curtain, wherein lifting curtain locking mechanism includes ratchet wheel, shell and the transmission assembly, sliding member and drive motor being arranged in shell, the ratchet wheel is arranged in the shell side, the sliding member is slidably arranged in shell, the sliding member is provided with the lock tongue that can extend shell towards the ratchet wheel side, the lock tongue can be engaged with the ratchet wheel;The drive motor is connected with the sliding member by the transmission assembly, to drive the sliding member close to or away from the ratchet wheel.This application has the advantages that the locking of ratchet wheel is realized by the cooperation of sliding member and lock tongue, the overall structure is simple, the mechanical strength is high, and the locking effect is good.

Description

Technical Field

[0001] This utility model relates to the field of locking mechanism technology, and in particular to a locking mechanism for a lifting curtain and a lifting curtain. Background Technology

[0002] Most of the lifting screens on the market currently use worm gears, worm helical gears, or gear racks to provide lifting power to the screen. At the same time, they rely on gear self-locking to ensure that the screen can be stably fixed on the bracket when it retracts. Although this structure is safe, it is relatively complex, requires more installation space, and has a relatively high manufacturing cost.

[0003] In addition, as the size of the screen increases, it is necessary to meet the requirements of high load, long life, small space and low cost. It is difficult to meet the requirements by relying solely on the worm gear structure for self-locking to fix the screen.

[0004] In view of this, the purpose of this utility model is to provide a new technical solution to solve the existing technical problems. Utility Model Content

[0005] In order to overcome the shortcomings of the existing technology, this utility model provides a lifting curtain locking mechanism and a lifting curtain, which solves the problems of complex structure and high manufacturing cost of the existing curtain locking mechanism.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] A lifting curtain locking mechanism includes a ratchet, a housing, and a transmission assembly, a sliding member, and a drive motor disposed within the housing. The ratchet is disposed on one side of the housing, and the sliding member is slidably disposed within the housing. The sliding member has a locking tongue that extends out of the housing and can engage with the ratchet on the side facing the ratchet. The drive motor is connected to the sliding member through the transmission assembly to drive the sliding member to move closer to or away from the ratchet.

[0008] In the above structure, the transmission component includes a first gear and a second gear, the output shaft of the drive motor is provided with a worm gear, the first gear meshes with the worm gear, the second gear meshes with the first gear, and the rotational speed of the second gear is less than the rotational speed of the first gear. The second gear is connected to the sliding member in a transmission manner.

[0009] In the above structure, the transmission assembly further includes a third gear and a fourth gear. The third gear is meshed with the first gear, the fourth gear is meshed with the third gear, and the fourth gear is meshed with the second gear.

[0010] The rotational speeds of the first gear, third gear, fourth gear, and second gear decrease sequentially.

[0011] In the above structure, the sliding member has a mounting through hole in the middle, and the wall of the mounting through hole is provided with a meshing part. The second gear is at least partially located in the mounting through hole and meshes with the meshing part.

[0012] In the above structure, a middle plate is provided inside the housing, the sliding member is slidably disposed on the middle plate, the transmission assembly is disposed on the side of the middle plate facing away from the sliding member, the middle plate is provided with a limiting protrusion on the side facing the sliding member, and the sliding member is correspondingly provided with a limiting groove on the side facing the middle plate, the limiting groove cooperating with the limiting protrusion.

[0013] In the above structure, a limiting step is provided on the side of the middle plate away from the locking tongue, and a buffer pad is provided between the limiting step and the sliding member.

[0014] In the above structure, the housing has an outlet facing the ratchet, the locking tongue extends out of the outlet, and a sealing gasket is provided inside the housing at the outlet, and the sealing gasket is sleeved on the outer periphery of the locking tongue.

[0015] In the above structure, shock-absorbing pads are provided on both sides of the drive motor that are in contact with the housing.

[0016] Based on the above-described lifting curtain locking mechanism, this utility model also provides:

[0017] A lifting screen includes a lifting screen locking mechanism with the structure described above.

[0018] The beneficial effects of this utility model are as follows: The lifting screen locking mechanism of this utility model utilizes a drive motor and transmission components to drive the sliding parts to slide, causing the locking tongue to engage with or disengage from the ratchet to achieve self-locking of the screen's lifting movement. It can output a large torque, and when the locking tongue engages in the ratchet's tooth groove, it can achieve an absolutely deterministic mechanical stop. When applied to lifting screens, its locking effect is reliable. Furthermore, the overall structure of the mechanism is simple, the manufacturing cost is low, and it can be applied in space-constrained scenarios. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a structural breakdown diagram of the lifting curtain locking mechanism of this utility model;

[0021] Figure 2 This is a schematic diagram of the connection structure of the transmission component of this utility model;

[0022] Figure 3 This is a schematic diagram of the lifting screen part of this utility model;

[0023] Figure 4 This is a schematic diagram of the lifting structure of this utility model.

[0024] Figure label:

[0025] 1. Ratchet;

[0026] 2. Sliding component; 21. Mounting through hole; 22. Engaging part; 23. Locking tongue;

[0027] 3. Transmission assembly; 31. First gear; 311. First shaft; 32. Second gear; 321. Second shaft; 33. Third gear; 331. Third shaft; 34. Fourth gear; 341. Fourth shaft;

[0028] 4. Drive motor; 41. Worm gear;

[0029] 5. Housing; 51. Middle plate; 511. Limiting step; 512. Limiting protrusion; 52. Sealing gasket; 53. Shock-absorbing pad; 54. Buffer pad; 55. PCB control board;

[0030] 6. Lifting assembly; 61. Driven outrigger; 62. Active outrigger; 621. Wire rope; 622. Telescopic spring; 63. Connecting plate. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1-4 The present invention will be further described below.

[0032] The following will clearly and completely describe the concept, specific structure, and technical effects of this utility model in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model. Furthermore, all connections / linkages involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this utility model can be combined interactively without contradicting each other.

[0033] Reference Figure 1 and Figure 2This utility model provides a locking mechanism for a lifting screen, which can be applied to vehicle-mounted lifting screens or other similar scenarios that require linkage lifting and self-locking, and can achieve stable self-locking of the lifting screen. It includes a ratchet 1, a housing 5, and a transmission assembly 3, a sliding member 2, and a drive motor 4 disposed within the housing 5. The ratchet 1 is located on one side of the housing 5. In actual installation, the ratchet 1 can be mounted on the lifting assembly 6 of the lifting screen. When the lifting assembly 6 drives the screen to rise and fall, it drives the ratchet 1 to rotate synchronously. The sliding member 2 is slidably disposed within the housing 5, and a locking tongue 23 is fixedly disposed on the side of the sliding member 2 near the ratchet 1. During the sliding process of the sliding member 2, the locking tongue 23 can move closer to or away from the ratchet 1. When the locking tongue 23 engages with the ratchet 1, the ratchet 1 is locked, thereby controlling the lifting assembly 6 to stop its lifting and falling movement, thus locking the screen. The drive motor 4 and the transmission assembly 3 are disposed within the housing 5. The drive motor 4, as a power source, is connected to the sliding member 2 via the transmission assembly 3 to achieve the sliding drive of the sliding member 2. In this embodiment, a PCB control board 55 is also disposed within the housing 5. The PCB control board 55 is electrically connected to the drive motor 4 to achieve control of the drive motor 4.

[0034] The sliding component 2, transmission component 3, and drive motor 4 are housed in the housing 5, which facilitates the integration of the entire mechanism and makes it easier to install the lifting screen locking mechanism on the lifting screen, thus reducing assembly difficulty. It also effectively reduces the possibility of foreign objects entering the transmission component 3 and drive motor 4 and affecting the drive transmission.

[0035] Reference Figure 2 Furthermore, the transmission assembly 3 includes at least a first gear 31 and a second gear 32. The output shaft of the drive motor 4 is equipped with a worm gear 41. The first gear 31 meshes with the worm gear 41. In some embodiments, the second gear 32 directly meshes with the first gear 31 and is connected to the sliding member 2 for transmission. The drive motor 4 drives the worm gear 41 to rotate, which in turn drives the first gear 31 to rotate. The first gear 31 then drives the second gear 32 to rotate, thereby realizing the sliding transmission of the sliding member 2. This ensures that the rotational speed of the second gear 32 is less than that of the first gear 31. When power is transmitted from the first gear 31 to the second gear 32, the rotational speed of the second gear 32 decreases, and the torque increases. As a result, the drive motor 4 can output a smaller amount of power to achieve effective braking of the ratchet 1, which helps to make the lifting curtain locking mechanism lighter.

[0036] In this embodiment, the drive motor 4 is a brushed DC motor. Brushed DC motors have the characteristics of smooth operation, fast response speed and high control precision. They can accurately lock the curtain by engaging the locking tongue 23 with the ratchet 1 when the curtain rises or falls.

[0037] In other embodiments, the transmission assembly 3 may further include a third gear 33 and a fourth gear 34, i.e., transmission is achieved through the cooperation of the first gear 31, the second gear 32, the third gear 33, and the fourth gear 34. The third gear 33 meshes with the first gear 31, the fourth gear 34 meshes with the third gear 33, and the fourth gear 34 meshes with the second gear 32. The first gear 31, the third gear 33, the fourth gear 34, and the second gear 32 are arranged sequentially along the sliding direction of the slider 2, and through gear transmission, the rotational speed gradually decreases while the torque increases. In actual installation, the reduction in rotational speed can be achieved by increasing the diameter of the gears, i.e., the diameters of the first gear 31, the third gear 33, the fourth gear 34, and the second gear 32 are arranged in a sequentially increasing manner.

[0038] By adding a third gear 33 and a fourth gear 33 between the first gear 31 and the second gear 32, the transmission stroke is further increased. Through the setting of multi-stage gears, the rotational speed can be gradually reduced, ensuring the smoothness and stability of the transmission. Moreover, the setting of multi-stage gears can transmit a large torque, further ensuring the reliability of braking the ratchet 1.

[0039] Reference Figure 2 During installation, the first gear 31 is fixedly connected to the middle of the first rotating shaft 311, which is rotatably connected to the housing 5; the second gear 32 is fixedly connected to the middle of the second rotating shaft 321, which is rotatably connected to the housing 5; the third gear 33 is fixedly connected to the middle of the third rotating shaft 331, which is rotatably connected to the housing 5; and the fourth gear 34 is fixedly connected to the middle of the fourth rotating shaft 341, which is also rotatably connected to the housing 5.

[0040] In this embodiment, the first gear 31 is configured as a first double gear, the second gear 32 is configured as a second double gear, the third gear 33 is configured as a third double gear, and the fourth gear 34 is configured as a spur gear. The first-stage gear meshing with the worm 41 is a helical gear. The first-stage transmission adopts a worm 41-helical gear structure, which has a large single-stage reduction ratio. Therefore, a small drive motor 4 can be used to obtain a large output force, which is beneficial to reducing production costs. In addition, all gears are made of plastic material, which has the function of sound absorption. While ensuring the transmission strength, it can effectively reduce the noise of the transmission structure operation.

[0041] Furthermore, a mounting through hole 21 is provided in the middle of the sliding member 2, and an engagement part 22 is provided on the wall of the mounting through hole 21. The second gear 32 is at least partially located in the mounting through hole 21 and is engaged with the engagement part 22. It should be noted that the engagement part 22 refers to a rack with a certain length formed by multiple teeth arranged in a certain direction. In this embodiment, the engagement part 22 is a rack with a certain length formed by multiple teeth arranged along the sliding direction of the sliding member 2.

[0042] Reference Figure 1 and Figure 2 Furthermore, a middle plate 51 is provided inside the housing 5, the sliding member 2 is slidably disposed on the middle plate 51, and the transmission assembly 3 is disposed on the side of the middle plate 51 facing away from the sliding member 2. That is, the middle plate 51 divides the housing 5 into upper and lower layers, and the sliding member 2 and the transmission assembly 3 are respectively disposed on opposite sides of the middle plate 51. This arrangement can make full use of the space inside the housing 5, making the overall mechanism more integrated and compact, and applicable to space-constrained occasions.

[0043] In this embodiment, a clearance through hole is provided on the middle plate 51, and the clearance through hole is connected to the mounting through hole 21 of the sliding member 2. The second gear 32 extends at least partially from the clearance through hole into the mounting through hole 21 and engages with the meshing part 22.

[0044] Furthermore, a limiting protrusion 512 is provided on the side of the middle plate 51 facing the slider 2, and a corresponding limiting groove (not shown in the figure) is provided on the side of the slider 2 facing the middle plate 51. The limiting groove and the limiting protrusion 512 cooperate, and when the slider 2 slides on the middle plate 51, the limiting protrusion 512 slides in the limiting groove. Through the limiting cooperation between the limiting protrusion 512 and the limiting groove, the sliding of the slider 2 can be limited, which can effectively prevent the slider 2 from lateral shaking during the sliding process, effectively improve the sliding stability of the slider 2, and thus ensure that the locking tongue 23 can be accurately positioned to achieve braking of the ratchet 1 and improve braking accuracy.

[0045] Furthermore, a limiting step 511 is provided on the side of the middle plate 51 away from the locking tongue 23. The limiting step 511 can abut against the sliding member 2 to limit the sliding stroke of the sliding member 2. A buffer pad 54 is provided between the limiting step 511 and the sliding member 2 to buffer the impact between the sliding member 2 and the middle plate 51.

[0046] Furthermore, the housing 5 has an outlet facing the ratchet 1, and the locking tongue 23 extends out of the housing 5 from the outlet. The housing 5 is provided with a sealing gasket 52 located at the outlet, and the sealing gasket 52 is fitted around the outer periphery of the locking tongue 23. The sealing gasket 52 ensures the sealing performance of the housing 5, effectively reducing the possibility of debris entering the housing 5 from the outlet. Moreover, placing the sealing gasket 52 at the outlet can also effectively buffer the impact between the locking tongue 23 and the housing 5.

[0047] Furthermore, shock-absorbing pads 53 are provided on both sides of the drive motor 4 that are in contact with the housing 5. By providing shock-absorbing pads 53, the vibration of the drive motor 4 during operation can be effectively absorbed, thereby reducing operating noise.

[0048] In addition, for ease of assembly, the housing 5 can be configured as a detachable upper and lower housing, with a receiving cavity formed between the upper and lower housings. The sliding component 2, the transmission assembly 3, and the drive motor 4 are all housed within the receiving cavity.

[0049] Based on the above-described locking mechanism for the lifting screen, this utility model also provides:

[0050] A lifting screen includes a lifting screen locking mechanism with the structure described above.

[0051] Reference Figure 1 , Figure 3 and Figure 4 Furthermore, the lifting screen also includes the screen itself and a lifting assembly 6 for driving the screen's lifting and lowering. The lifting assembly 6 includes a connecting plate 63, an active support arm 62, and a driven support arm 61. The connecting plate 63 is connected to the screen, and one end of the active support arm 62 is hinged to the connecting plate 63. The end of the active support arm 62 away from the connecting plate 63 is hinged to the driven support arm 61. The end of the driven support arm 61 away from the active support arm 62 is connected to a ratchet 1. During the screen's lifting and lowering process, the driven support arm 61 drives the ratchet 1 to rotate. The screen is connected to a winding mechanism for winding or releasing the screen. During the process of the winding mechanism releasing the screen, the screen causes the active support arm 62 to extend downwards, and the driven support arm 61 extends accordingly, driving the ratchet 1 to rotate in the process.

[0052] Reference Figure 4 The active support arm 62 is equipped with a telescopic spring 622 and a steel wire rope 621. One end of the telescopic spring 622 is fixedly connected to the end of the active support arm 62 away from the driven support arm 61. One end of the steel wire rope 621 is connected to the telescopic spring 622, and the other end extends into the driven support arm 61 and is connected to the driven support arm 61. When the active support arm 62 extends downward or retracts upward, the driven support arm 61 moves accordingly under the action of the steel wire rope 621 and the telescopic spring 622.

[0053] When the curtain opens, the rolling mechanism releases and lowers the curtain. As the curtain descends, the active support arm 62 slowly extends and opens. The driven support arm 61, driven by the telescopic spring 622-steel wire rope 621 structure, follows the active support arm 62 and opens. The ratchet 1 is connected and fixed to the driven support arm 61, thereby driving the ratchet 1 to rotate around the center. When it is necessary to stop, the drive motor 4 is started, which drives the locking tongue 23 to move toward the ratchet 1 until it is engaged in the tooth groove of the ratchet 1, thus locking it. When it is necessary to continue opening, the drive motor 4 drives the locking tongue 23 to retract, releasing the locking tongue 23 from the ratchet 1, and the operation can continue.

[0054] When the curtain retracts, the rolling mechanism moves in the opposite direction to roll the curtain up. At this time, the active support arm 62 begins to bend and retract, and the driven support arm 62 bends and retracts accordingly under the action of the telescopic spring 622-steel wire rope 621 structure. At this time, the ratchet 1 rotates synchronously. When it is necessary to stop, the drive motor 4 is started, which drives the locking tongue 23 to move toward the ratchet 1 until it is engaged in the tooth groove of the ratchet 1, thereby locking it. When it is necessary to continue rolling, the drive motor 4 drives the locking tongue 23 to retract, releasing the locking tongue 23 from the ratchet 1, and the operation can continue.

[0055] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A locking mechanism for a lifting screen, characterized in that: The device includes a ratchet, a housing, and a transmission assembly, a slider, and a drive motor disposed within the housing. The ratchet is disposed on one side of the housing, and the slider is slidably disposed within the housing. The slider has a locking tongue that extends out of the housing and can engage with the ratchet on the side facing the ratchet. The drive motor is connected to the slider through the transmission assembly and is used to drive the slider to move closer to or away from the ratchet.

2. The lifting curtain locking mechanism according to claim 1, characterized in that: The transmission assembly includes a first gear and a second gear. The output shaft of the drive motor is provided with a worm gear. The first gear meshes with the worm gear, and the second gear meshes with the first gear. The rotational speed of the second gear is less than that of the first gear. The second gear is connected to the sliding member in a transmission manner.

3. The lifting curtain locking mechanism according to claim 2, characterized in that: The transmission assembly further includes a third gear and a fourth gear, wherein the third gear is meshed with the first gear, the fourth gear is meshed with the third gear, and the fourth gear is meshed with the second gear; The rotational speeds of the first gear, the third gear, the fourth gear, and the second gear decrease sequentially.

4. The lifting curtain locking mechanism according to claim 2, characterized in that: The sliding member has a mounting through hole in the middle, and the wall of the mounting through hole is provided with a meshing part. The second gear is at least partially located in the mounting through hole and meshes with the meshing part.

5. The lifting curtain locking mechanism according to claim 1, characterized in that: The housing is provided with a middle plate, the sliding member is slidably disposed on the middle plate, the transmission assembly is disposed on the side of the middle plate away from the sliding member, the middle plate is provided with a limiting protrusion on the side facing the sliding member, and the sliding member is provided with a corresponding limiting groove on the side facing the middle plate, the limiting groove and the limiting protrusion cooperate with each other.

6. The lifting curtain locking mechanism according to claim 5, characterized in that: A limiting step is provided on the side of the middle plate away from the locking tongue, and a buffer pad is provided between the limiting step and the sliding member.

7. The lifting curtain locking mechanism according to claim 1, characterized in that: The housing has an outlet facing the ratchet, the locking tongue extends out of the outlet, and a sealing gasket is provided inside the housing at the outlet, and the sealing gasket is fitted around the outer periphery of the locking tongue.

8. The lifting curtain locking mechanism according to claim 1, characterized in that: Shock-absorbing pads are provided on both sides of the drive motor that are in contact with the housing.

9. A retractable screen, characterized in that: Includes the lifting curtain locking mechanism as described in any one of claims 1-8.

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