Roller shutter door motor transmission device with anti-locking structure

Abstract

The utility model discloses a roller shutter door motor transmission device with an anti-locking structure, which relates to the technical field of roller shutter door motor transmission, and comprises a mounting plate, the mounting plate is provided with a small chain wheel and a large chain wheel, and the small chain wheel and the large chain wheel are connected through a chain; the anti-locking structure comprises a limiting plate, the limiting plate is installed on the installation plate, the limiting plate is located on the outer side of the large chain wheel, and the limiting plate limits a local chain on the outer side of the large chain wheel and prevents the chain from being locked due to deviation. The utility model has the beneficial effects of anti-jamming, low abrasion and long service life.

Description

Technical Field

[0001] This utility model relates to the field of roller shutter door motor drive technology, specifically to a roller shutter door motor drive device with an anti-jamming structure. Background Technology

[0002] In the field of roller shutter door motor drive systems, traditional designs typically employ a chain-sprocket meshing transmission method to transmit power. However, in actual use, factors such as the meshing clearance between the chain and sprocket, installation errors, vibration, or load fluctuations can cause the chain to easily shift laterally or jump, leading to problems such as the chain dislodging from the sprocket teeth, jamming, or even breaking. This not only causes transmission failure but also generates abnormal noise, and in severe cases, may damage the motor or roller shutter door structure, affecting the safety and service life of the equipment.

[0003] To address the aforementioned problems, existing technologies have attempted improvements by adjusting the sprocket mounting position, optimizing chain tension, or adding guide structures. For example, some designs use fixed baffles to limit the lateral movement of the chain, but such structures typically suffer from the following drawbacks:

[0004] Insufficient limiting accuracy: When the gap between the fixed baffle and the chain is too large, it cannot effectively restrain the chain from deviating; if the gap is too small, the increased friction may lead to accelerated chain wear, or even cause jamming.

[0005] Poor adaptability: The single baffle structure is difficult to adapt to the wear or thermal expansion and contraction deformation of the chain caused by long-term use, resulting in the gradual failure of the limiting effect.

[0006] Structural limitations: Traditional guide structures only constrain the chain locally and do not fully consider the dynamic offset characteristics of the chain in the sprocket meshing area. Especially under high-speed or heavy-load conditions, the chain may still come off due to instantaneous impact.

[0007] In addition, some designs attempt to improve transmission stability by adding tension wheels or auxiliary sprockets, but such solutions usually require additional space and increase the complexity and manufacturing cost of the transmission system, making it difficult to meet the requirements of compact and lightweight roller shutter door motor transmission devices. Utility Model Content

[0008] This utility model provides a motor transmission device for roller shutter doors with an anti-jamming structure. By optimizing the synergistic effect of the limiting plate and the limiting wheel, the chain is guided and constrained, thereby effectively solving problems such as chain deviation, jamming and wear.

[0009] To achieve the above objectives, this utility model provides the following technical solution:

[0010] A roller shutter door motor drive device with an anti-jamming structure includes:

[0011] Mounting plate, the mounting plate is provided with small sprocket and large sprocket, the small sprocket and large sprocket are connected by a chain;

[0012] The anti-jamming structure includes a limiting plate, which is mounted on the mounting plate and located on the outside of the large sprocket. The limiting plate restricts a portion of the chain on the outside of the large sprocket to prevent the chain from shifting and jamming.

[0013] Furthermore, the limiting plate includes:

[0014] An arc-shaped plate is fitted to the outer side of the large sprocket to prevent the chain from shifting and jamming.

[0015] The L-shaped bracket is connected to the side of the arc-shaped plate and is fixed to the mounting plate by screws.

[0016] Furthermore, the arc-shaped plate is provided with an arc-shaped groove, which is used to restrict the chain.

[0017] Furthermore, the width H of the arc-shaped groove is greater than the width F of the chain.

[0018] Furthermore, the gap between the width H and the width F is 0.30 to 0.50 mm.

[0019] Furthermore, the anti-jamming structure also includes a limiting wheel, which is rotatably mounted on the mounting plate. The limiting wheel is located between the small sprocket and the large sprocket, and is close to the large sprocket.

[0020] Furthermore, the limiting wheel is provided with an annular groove to prevent the chain from deviating.

[0021] Furthermore, the width T of the annular groove is greater than the width F of the chain.

[0022] Furthermore, the gap between the width T and the width F is 0.25 to 0.35 mm.

[0023] Furthermore, the arc-shaped groove has a bottom wall and a pair of side walls, the gap between the outermost edge of the chain and the bottom wall is 0.30 to 0.50 mm, and both the bottom wall and the side walls have a wear-resistant coating.

[0024] Compared with the prior art, the advantages of this utility model are:

[0025] The arc-shaped groove of the limiting plate and the matching design of the outer side of the large sprocket effectively constrain the lateral offset range of the chain, avoiding the problem of chain tooth stripping and jamming caused by vibration, load fluctuation or installation error, and ensuring the stability of the transmission system under high-speed, heavy-load or frequent start-stop conditions.

[0026] The gap between the arc groove and the chain is controlled at 0.30 to 0.50 mm, which avoids friction and jamming caused by too small a gap, and also prevents limit failure caused by too large a gap. Combined with the wear-resistant coating on the bottom and side walls of the groove, the direct wear between the chain and the limit structure is reduced, and the service life of the chain and the transmission device is extended.

[0027] The limiting wheel provides secondary guidance to the chain through the annular groove. Its 0.25-0.35mm gap can compensate for the dynamic sway of the chain in long-span transmission. In particular, it forms a double constraint in the sprocket meshing area, effectively suppressing the risk of instantaneous chain derailment and improving transmission stability.

[0028] The L-shaped bracket simplifies the installation process of the limit plate through a single screw fixing design, while the integrated structure of the arc plate and the bracket reduces space occupation.

[0029] The limiting wheel uses an internal hexagonal connecting shaft and bearing combination to achieve quick positioning and assembly, and the external thread section is compatible with mounting plates of different thicknesses, improving the versatility of the device.

[0030] The chamfering of the annular groove edges reduces impact noise during chain meshing, while the wear-resistant coating and reasonable clearance design reduce the generation of wear particles, thereby reducing the frequency of lubrication and component replacement, achieving low-noise operation and long-term maintenance-free operation. Attached Figure Description

[0031] Figure 1 This is the front view of the present invention.

[0032] Figure 2 This is a front view of the limiting plate of this utility model.

[0033] Figure 3 This is a three-dimensional structural diagram of the limiting plate of this utility model.

[0034] Figure 4 This is a partial structural diagram of the arc-shaped groove of the limiting plate of this utility model.

[0035] Figure 5 This is a front view showing the relationship between the chain and the limiting wheel in this utility model.

[0036] Figure 6 For the present utility model Figure 5 A cross-sectional view at point AA and a schematic diagram showing its connection to the mounting plate.

[0037] Figure 7This is the front view of the connecting shaft of this utility model.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1-Small sprocket;

[0040] 2-Mounting plate;

[0041] 3-Chain;

[0042] 4-Large sprocket;

[0043] 5-Limiting plate; 51-Arc-shaped plate; 511-Arc-shaped groove; 5111-Groove bottom wall; 5112-Groove side wall; 52-L-shaped bracket; 521-First arm; 522-Second arm; 53-First through hole;

[0044] 6-Restriction wheel; 61-Annular groove; 62-Chamfer; 64-Second through hole;

[0045] 7-Connecting shaft; 71-Internal hexagon head; 72-Positioning shaft; 73-Extension shaft; 74-External thread section;

[0046] 8-Bearing. Detailed Implementation

[0047] refer to Figures 1 to 7 ,like Figure 1 As shown, this embodiment provides a roller shutter door motor drive device with an anti-jamming structure. The roller shutter door motor drive device of this embodiment uses a mounting plate 2 as its base, on which a small sprocket 1 and a large sprocket 4 are mounted via bearing seats. The two are connected by a chain 3. The anti-jamming structure consists of a limiting plate 5 and a limiting wheel 6, which dynamically constrain the meshing and slack sections of the chain 3, respectively.

[0048] like Figure 2 , Figure 3 , Figure 4 As shown, the limiting plate 5 is installed on the mounting plate 2. The limiting plate 5 is located outside the large sprocket 4. The limiting plate 5 restricts the local chain 3 outside the large sprocket 4 to prevent the chain 3 from shifting and getting stuck.

[0049] The arc plate 51 is adapted to the outer side of the large sprocket 4 to prevent the chain 3 from shifting and getting stuck. The arc plate 51 is made of 65Mn spring steel and heat-treated (HRC45-50). Its radius of curvature R = the tip circle diameter of the large sprocket 4 + 2mm.

[0050] In one embodiment, an arc-shaped groove 511 is formed on the arc-shaped plate 51, which is used to restrict the chain 3. The width H of the arc-shaped groove 511 is greater than the width F of the chain 3. The gap between the width H and the width F is 0.30 to 0.50 mm.

[0051] In one embodiment, the width H of the arc groove 511 is equal to the chain width F + 0.40 mm (in this embodiment, F = 7.92 mm, H = 8.32 mm). In another embodiment, the arc groove 511 has a bottom wall 5111 and a pair of side walls 5112. The gap between the outermost part of the chain 3 and the bottom wall 5111 is 0.30 to 0.50 mm. Both the bottom wall 5111 and the side walls 5112 have a wear-resistant coating.

[0052] Preferably, the gap between the bottom wall 5111 of the groove and the outermost side of the chain is 0.40 mm.

[0053] Preferably, the sidewall of the tank 5112 is sprayed with a tungsten carbide wear-resistant coating (thickness 0.15mm, hardness HV1200), and the bottom wall of the tank 5111 is chrome-plated (thickness 0.05mm).

[0054] The L-shaped bracket 52 is connected to the side of the arc plate 51 and is fixed to the mounting plate 2 by screws.

[0055] One end of the first arm 521 is connected to the side of the arc plate 51, and the second arm 522 is connected to the other end of the first arm 521; a first through hole 53 is provided on the second arm 522, and a screw passes through the first through hole 53 to be connected to the mounting plate 2.

[0056] Preferably, after the first arm 521 is welded to the arc plate 51, stress relief treatment is performed, and the second arm 522 has a first through hole 53 with a diameter of φ5.5mm. An M5×12 hexagon socket screw is passed through the first through hole 53 and fixed in the M5 threaded hole of the mounting plate 2 with a spring washer. The installation torque is controlled at 3.5-4.0 N·m.

[0057] like Figure 5 , Figure 6 and Figure 7 As shown, the limiting wheel 6 is rotatably mounted on the mounting plate 2, located between the small sprocket 1 and the large sprocket 4, and close to the large sprocket 4. The limiting wheel 6 has an annular groove 61 to prevent the chain 3 from deviating. The edge of the annular groove 61 has a chamfer 62.

[0058] The width T of the annular groove 61 is greater than the width F of the chain 3. The gap between the width T and the width F is 0.25 to 0.35 mm.

[0059] Preferably, the limiting wheel 6 is injection molded from POM engineering plastic, and the width T of the annular groove 61 is equal to the chain width F + 0.30 mm (T = 8.22 mm in this embodiment); the edge of the annular groove 61 is provided with a C0.5 chamfer 62, and a lubricating oil groove (2 mm wide and 0.5 mm deep) is provided at the bottom of the groove.

[0060] The rotation limiter wheel 6 is mounted on the connecting shaft 7 of the mounting plate 2. The connecting shaft 7 consists of an internal hexagon head 71, a positioning shaft 72, an extension shaft 73, and an external thread section 74, and is made of 304 stainless steel.

[0061] The external threaded section 74 is threaded onto the mounting plate 2, and the second through hole 64 of the limiting wheel 6 is rotatably configured with the positioning shaft 72. Specifically, the limiting wheel 6 forms a clearance fit (H7 / g6) with the positioning shaft 72 through the second through hole 64.

[0062] In one embodiment, two 6004-2RS deep groove ball bearings 8 are installed between the second through hole 64 and the positioning shaft 72.

[0063] The external thread section 74 is mounted on the extension shaft 73. The external thread section 74 is screwed into the M8 threaded hole of the mounting plate 2 and tightened by applying a torque of 20 N·m with an internal hex wrench.

[0064] When chain 3 engages with sprocket 4, the arc groove 511 restricts its lateral movement through the groove sidewall 5112; in the slack section of the chain, the annular groove 61 of the limiting wheel 6 guides the chain trajectory through rolling friction, and the chamfer 62 prevents scratching; when the chain elongates due to thermal expansion, the extension shaft 73 of the connecting shaft 7 reserves 2mm of axial adjustment, and the position of the limiting wheel 6 is finely adjusted by rotating the internal hexagon head 71.

[0065] In one embodiment, a double-row angular contact ball bearing 8 is installed between the positioning shaft 72 of the connecting shaft 7 and the second through hole 64, with a contact angle of 30° and a preload force controlled at 80-100N by a special tooling.

[0066] This embodiment achieves the beneficial effects of anti-jamming, low wear, and long life through systematic innovation in materials, structure, and process, and is particularly suitable for high-frequency, high-load commercial roller shutter door scenarios.

Claims

1. A roller shutter door motor drive having an anti-stuck structure, characterized in that, include: Mounting plate (2), on which a small sprocket (1) and a large sprocket (4) are provided, the small sprocket (1) and the large sprocket (4) are connected by a chain (3); The anti-jamming structure includes a limiting plate (5), which is installed on the mounting plate (2). The limiting plate (5) is located on the outside of the large sprocket (4). The limiting plate (5) restricts the local chain (3) on the outside of the large sprocket (4) to prevent the chain (3) from shifting and jamming.

2. The roller shutter door motor transmission device with anti-stuck structure according to claim 1, characterized in that, The limiting plate (5) includes: An arc-shaped plate (51) is adapted to the outer side of the large sprocket (4) to prevent the chain (3) from shifting and jamming; L-shaped bracket (52) is connected to the side of the arc plate (51) and is fixed to the mounting plate (2) by screws.

3. The roller shutter door motor transmission device with anti-stuck structure according to claim 2, characterized in that, The arc plate (51) has an arc groove (511) which is used to restrict the chain (3).

4. The roller shutter door motor transmission device with anti-stuck structure according to claim 3, characterized in that, The width H of the arc groove (511) is greater than the width F of the chain (3).

5. The roller shutter door motor drive with anti-stuck structure according to claim 4, characterized in that, The gap between the width H and the width F is 0.30 to 0.50 mm.

6. The roller shutter door motor drive with anti-stuck structure according to claim 1, characterized in that, The anti-jamming structure also includes a limiting wheel (6), which is rotatably mounted on the mounting plate (2). The limiting wheel (6) is located between the small sprocket (1) and the large sprocket (4) and is close to the large sprocket (4).

7. The roller shutter door motor drive with anti-stuck structure according to claim 6, characterized in that, The limiting wheel (6) has an annular groove (61) to prevent the chain (3) from deviating.

8. The roller shutter door motor drive with anti-stuck structure according to claim 7, characterized in that, The width T of the annular groove (61) is greater than the width F of the chain (3).

9. The roller shutter door motor drive with anti-stuck structure according to claim 8, characterized in that, The gap between the width T and the width F is 0.25 to 0.35 mm.

10. The roller shutter door motor drive with anti-stuck structure according to claim 4, characterized in that, The arc-shaped groove (511) has a bottom wall (5111) and a pair of side walls (5112). The gap between the outermost part of the chain (3) and the bottom wall (5111) is 0.30 to 0.50 mm. Both the bottom wall (5111) and the side walls (5112) have wear-resistant coatings.

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