Garage door transmission system

Abstract

A garage door transmission system comprises a track and a chain, and an inserting groove is formed in a connecting piece on the chain. The sliding block is mounted on the track in a sliding manner; the limiting piece is fixedly arranged on the rail corresponding to the position of the sliding block when the door is opened; the hook comprises a rod-shaped body rotationally mounted on the sliding block, a hook part is arranged at one end of the rod-shaped body, a stress part is arranged at the other end of the rod-shaped body, the limiting pressing block is rotationally mounted on the sliding block, and a first crimping part and a second crimping part are arranged on the peripheral surface of the limiting pressing block in the rotating direction; the rod-shaped body is elastically connected with the sliding block through the first elastic piece, so that the stress part has the tendency of swinging towards the limiting pressing block; the plug pin is slidably mounted on the sliding block in the width direction of the track; the swing arm is hinged to the sliding block, and the plug pin and the limiting pressing block are both in transmission connection with the swing arm; the swing arm swings to drive the bolt to move and the limiting pressing block to rotate, manual and electric modes are switched, and after the door is opened in a power-off mode, the hook and the limiting piece on the rail can be hooked to ensure the safety after the door is opened.

Description

Technical Field

[0001] This invention relates to the field of garage door technology, and in particular to a garage door transmission system. Background Technology

[0002] Automatic garage doors are widely used. A complete garage door system consists of components such as a door operator, a transmission system, the door, and a guide structure. The transmission system of a garage door typically includes a track installed on the top of the garage, a rotary chain within the track, and a slider slidably installed within the track. The slider is connected to the door via a drag bar, and the rotation of the chain is converted into the movement of the door in the opening and closing direction through the transmission connection between the door operator and the chain.

[0003] The slider is usually equipped with a clutch mechanism. When the power is off, pulling the clutch rope will disengage the pin from the connector on the chain, thereby disconnecting the door from the transmission system. The door can be manually opened and closed as the slider slides in the track.

[0004] However, the above method requires manual pushing of the door to ensure it is open before driving the car out of the garage, which poses certain safety risks. Summary of the Invention

[0005] In response to the shortcomings of the existing production technology, the applicant provides a garage door transmission system that, while meeting the usage requirements of garage doors, can lock the door position after manual opening following a power outage, ensuring safety after the door is opened.

[0006] The technical solution adopted in this invention is as follows: A garage door drive system, comprising, The track, and the chain rotatably mounted in the track, with slots provided on the connectors on the chain; A slider is slidably mounted on the track; A limiting component is fixed on the track to correspond to the position of the slider when the door is opened; The hook includes a rod-shaped body rotatably mounted on the slider, one end of the rod-shaped body is provided with a hook portion, and the other end of the rod-shaped body is provided with a force-receiving portion; A limiting pressure block is rotatably mounted on the slider, and a first pressing part and a second pressing part are provided on the outer peripheral surface of the limiting pressure block in the direction of rotation; The first elastic element elastically connects the rod-shaped body to the slider, so that the force-bearing part tends to swing toward the limiting pressure block; A pin, corresponding to the slot, is slidably mounted on the slider along the width direction of the track; The swing arm is hinged to the slider, and the pin and the limiting block are both connected to the swing arm transmission. The swing arm swings to drive the pin to a clearance position to avoid the slot, and drives the limiting block to rotate so that the first pressing part contacts the force-bearing part, and the hook part is in a hooking position to connect with the limiting member. The swing arm swings again, driving the pin to the connection position for insertion into the slot, and driving the limiting block to rotate so that the second pressing part contacts the force-bearing part, and the hook is in the unlocked position for avoiding the limiting member.

[0007] As a further improvement to the above technical solution: The slider is provided with a channel for the connection to pass through; The limiting block rotates around the axis of the pin, the swing arm is positioned and installed on the pin along the axis and is hinged to the slider through the pin, the limiting block is located between the channel and the swing arm, and the slider is provided with a first stop structure for limiting the unidirectional rotation of the limiting block; The limiting pressure block is fixed with a driven tooth group, the swing arm is fixed with a driving tooth group, and a second elastic element is also included. The second elastic element elastically connects the swing arm and the slider, so that the driven tooth group and the driving tooth group are in contact and connected. Swing the swing arm in the opposite direction to the rotation direction of the limiting block to change the distance between the limiting block and the swing arm along the axis, so that the pin moves between the clearance position and the connection position. The swing arm swings in the same direction as the rotation direction of the limiting pressure block, driving the limiting pressure block to rotate and switching the positions of the first pressing part and the second pressing part.

[0008] When the pin is inserted into the slot, the insertion depth of the pin in the slot is H; The driven gear assembly includes guide blocks and axial limiting blocks arranged alternately in a ring around the axis. The guide blocks are provided with a first guide slope facing the drive gear assembly, and the axial limiting blocks are provided with a limiting plane perpendicular to the axis. One end of the first guide slope protrudes from the limiting plane, and the other end of the first guide slope forms a groove with the adjacent axial limiting block. The distance H between the bottom of the groove and the limiting plane along the axis is 1. The drive gear assembly includes a reference surface located on the rocker arm and a push block protruding from the reference surface. The push block matches the slot and has a second guide slope. When the swing arm swings in the opposite direction to the rotation direction of the limit block: The first guide ramp and the second guide ramp are in contact with each other and move relative to each other, driving the swing arm to move away from the channel. When the push block passes the first guide ramp and contacts the limiting plane, the pin is in the avoidance position. Alternatively, the push block contacts and moves relative to the limiting plane until the push block is located in the slot and the first guide slope is in complete contact with the second guide slope, at which point the pin is located in the connection position; When the push block contacts the limiting plane or is located in the slot, the swing arm swings in the same direction as the rotation direction of the limiting pressure block, causing the limiting pressure block to rotate.

[0009] The second elastic element is a conical spring. The second elastic element is sleeved outside the pin. The swing arm is provided with a connecting hole. One end of the second elastic element is connected to the connecting hole, and the other end of the second elastic element is connected to the slider. When the swing arm swings, the second elastic element applies a spring force to the swing arm in the same direction as the rotation of the limiting pressure block.

[0010] It also includes a spring mounting base, which is detachably mounted on the slider. The spring mounting base has a side opening groove, which engages with the end of the second elastic element. A through hole is provided in the center of the side opening groove, and the through hole is slidably connected to the pin.

[0011] The connector has side guide surfaces at both ends corresponding to the pin. When the side guide surfaces contact the pin, the second elastic element is further compressed. An extension arm is provided on one side of the rod-shaped body corresponding to the connector, and a protrusion is provided on the extension arm. A recess corresponding to the protrusion is provided on the connector. When the connector moves in the channel, the protrusion contacts the connector and drives the hook to swing away from the limiting member. The distance between the recess and the end of the connector on one side of the hook is L1, and the distance of the slot along the length of the connector is L2. L1 and L2 are adapted so that after the slider is connected to the chain drive, the protrusion is located in the recess, so that the force-bearing part contacts the limiting pressure block.

[0012] The protrusion has a top guide surface, which contacts the end of the connector to lift the protrusion.

[0013] The first stop structure includes a first unidirectional limiting tooth arrayed along the circumferential direction, and the first unidirectional limiting tooth is provided with a first guide surface; The limiting block is provided with a second stop structure on the side opposite to the driven tooth group. The second stop structure includes a second unidirectional limiting tooth array distributed with the rotation center of the limiting block as the center. The number of the second unidirectional limiting teeth is the same as the number of the first unidirectional limiting teeth. The second unidirectional limiting tooth is provided with a second guide surface. A limiting groove is formed between the first guide surface and the adjacent first one-way limiting tooth to accommodate the second one-way limiting tooth. The limiting groove is used to restrict the rotation of the limiting block in one direction. The first guide surface contacts and slides relative to the second guide surface to guide the limiting block to rotate in another direction, so that the second one-way limiting tooth moves from one limiting groove to another adjacent limiting groove, thereby switching the positions of the first pressing part and the second pressing part.

[0014] The limiting block has two first pressing parts and two second pressing parts. The two first pressing parts are distributed along the first straight line direction, and the two second pressing parts are distributed along the second straight line direction. The first straight line direction and the second straight line direction are perpendicular to each other, and the intersection point is located on the axis. There are two guide blocks and two axial limiting blocks. The swing angle of the swing arm in the direction opposite to the rotation direction of the limiting block and the swing angle in the direction in the same direction as the rotation direction of the limiting block are both 90 degrees.

[0015] The slider is provided with a first swing direction limiting block and a second swing direction limiting block, and the swing arm swings around the pin between the first swing direction limiting block and the second swing direction limiting block. When the first swing direction limiting block contacts the swing arm, the pin is in the avoidance position or the connection position; when the second swing direction limiting block contacts the swing arm, the first pressing part or the second pressing part contacts the force-bearing part.

[0016] The beneficial effects of this invention are as follows: This invention features a compact and reasonable structure, and is easy to operate. A limiting component is installed on the track, and a hook that can swing relative to the limiting component is installed on the slider. The limiting pressure block that drives the hook's swing and the pin that connects to the chain are all linked to the swing of the swing arm. The swing of the swing arm ensures that when the door is opened electrically, the hook is in a clearance state and the slider is connected to the chain. When the door is opened manually, the hook is in an active state and the slider is connected to the chain, meeting the requirements for garage door use. Furthermore, after a power outage, the hook can engage with the limiting component on the track to ensure safety after the door is opened manually.

[0017] The present invention also includes the following advantages: (1) The limiting pressure block and the pin are set coaxially, and the axial position of the swing arm relative to the pin is fixed so that the pin and the swing arm follow the axis of the pin. The first stop structure is used to limit the rotation direction of the limiting pressure block. The swing arm swings in the opposite direction to the rotation direction of the limiting pressure block, changes the axial distance between the limiting pressure block and the swing arm, drives the pin to move, swings the swing arm in the same direction as the rotation direction, and converts the swing arm swing around the pin axis into the rotation of the limiting pressure block. The positions of the first pressing part and the second pressing part are switched in a cycle. The action of the pin and the hook is completed step by step in the reciprocating swing of the swing arm, which improves the recognizability of the mode switching operation.

[0018] (2) The limiting plane and the slot are arranged around the driven tooth group of the limiting pressure block in a circumferential direction to form a unidirectional guide. Combined with the first stop structure on the slider to stop the limiting pressure block in a unidirectional direction, the swing arm rotates relative to the limiting pressure block. By changing the state of the push block between contacting the limiting plane or contacting the slot, and by matching the axial distance between the limiting plane and the bottom of the slot with the insertion depth of the pin, the swing arm swings to drive the change of the axial position of the pin. The limiting plane and the slot are arranged around the driven tooth group in a circumferential direction to form a stepped structure on the same side. The stepped structure contacts the push block, so that the swing arm swings in the other direction to drive the limiting pressure block and the swing arm to rotate synchronously and keep the relative position relationship between the driving tooth group and the driven tooth group unchanged, realizing the switching of the first pressing part and the second pressing part. The structure of the driven tooth group and the driving tooth group is simple and easy to form.

[0019] (3) A conical spring is used as the second elastic element, and one end of the conical spring is connected to the connecting hole on the swing arm. The second elastic element can not only provide the elastic restoring force for driving the pin to move, but also provide the elastic restoring force in the same direction as the rotation of the limit block. After the swing arm swings to change the position of the pin, the swing arm is driven to swing under the torsional elastic force of the second elastic element, thereby realizing the rotation of the limit block. This makes the swing arm swing operation simpler and more convenient. Only one manual operation is needed to complete the action of the pin and the limit block, so that the opening and closing of the door after a power outage can be completed by one person.

[0020] (4) By setting an extension arm and a protrusion on the hook corresponding to the connector, after the power is turned on, the connector moves toward the channel located in the door opening position and is inserted into the pin. The protrusion applies force to the rod-shaped body on the hook side, causing the hook to separate from the limiting part. Combined with the torsional elastic force of the second elastic element, the swing arm swings, so that the hook is in the unlocked position. The garage door transmission system can be switched from manual to electric state by operating the swing arm once. After the power is turned off, the garage door can be directly connected to the door machine transmission after the power is restored. The state of the swing arm after the manual opening is identifiable, thereby determining whether the garage door transmission system is in a state that can be connected to the door machine transmission. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention (explosion mode).

[0022] Figure 2 This is a schematic diagram of the assembly structure of the hook, slider, and swing arm of the present invention.

[0023] Figure 3 This is a schematic diagram of the assembly structure of the hook, slider, and swing arm of the present invention (from another perspective).

[0024] Figure 4 This is an exploded view of the assembly structure of the hook, slider, and swing arm of the present invention.

[0025] Figure 5 This is an exploded view (from another perspective) of the assembly structure of the hook, slider, and swing arm of the present invention.

[0026] Figure 6 This is a comparison diagram of the hook portion of the present invention in the unlocked position and the hook engaged position.

[0027] Figure 7 This is a schematic diagram (three-dimensional view) of the limiting pressure block of the present invention.

[0028] Figure 8 This is a schematic diagram (top view) of the limiting pressure block of the present invention.

[0029] Figure 9 This is a schematic diagram (front view) of the limiting pressure block of the present invention.

[0030] Figure 10 This is a schematic diagram of the limiting pressure block of the present invention (another perspective perspective).

[0031] Figure 11 This is a schematic diagram of the swing arm structure of the present invention.

[0032] Figure 12 This is a schematic diagram of the first stop structure of the present invention.

[0033] Figure 13 This is a schematic diagram illustrating the switching process from electric door opening mode to manual door opening mode according to the present invention.

[0034] Figure 14 This is a schematic diagram (cross-sectional view) illustrating the switching process from electric door opening mode to manual door opening mode according to the present invention.

[0035] in: 1. Track; 11. First sprocket; 12. Second sprocket; 13. Limiting component; 2. Chain; 21. Connector; 211. Slot; 212. Recess; 213. Side guide surface; 3. Hook; 31. Hook portion; 32. Rod-shaped body; 321. Extension arm; 322. Protrusion; 3221. Top guide surface; 33. Force-bearing part; 4. Slider; 40. Channel; 41. First stop structure; 411. First one-way limiting tooth; 412. First guide surface; 413. Limiting groove; 42. Round tube; 43. Spring mounting seat; 431. Through hole; 432. Side opening groove; 44. Second swing direction limiting block; 45. Hinge part; 46. First swing direction limiting block; 5. First elastic element; 6. Swing arm; 61. Drive gear assembly; 611. Reference surface; 612. Push block; 613. Second guide ramp; 62. Connecting hole; 63. Wire hole; 7. Limiting and pressing blocks; 71. First crimping part; 72. Second crimping part; 73. Second stop structure; 731. Second one-way limiting tooth; 732. Second guide surface; 74. Driven gear assembly; 740. Slot; 741. Axial limiting block; 742. Limiting plane; 743. Guide block; 744. First guide slope; 8. Pin; 9. Second elastic element. Detailed Implementation

[0036] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0037] like Figures 1-6 As shown in the figure, an embodiment of the present application illustrates a garage door transmission system, which includes a track 1, a slider 4, a limiting member 13, a hook 3, a limiting pressure block 7, a first elastic member 5, a pin 8, and a swing arm 6.

[0038] The track 1 and the chain 2 rotatably installed in the track 1, the connector 21 on the chain 2 is provided with a slot 211; Slider 4 is slidably mounted on track 1; The limiting component 13 is fixed on the track 1 to correspond to the position of the slider 4 when the door is opened; The hook 3 includes a rod-shaped body 32 rotatably mounted on the slider 4. One end of the rod-shaped body 32 is provided with a hook portion 31, and the other end of the rod-shaped body 32 is provided with a force-receiving portion 33. The limiting pressure block 7 is rotatably mounted on the slider 4. The outer peripheral surface of the limiting pressure block 7 in the direction of rotation is provided with a first pressing part 71 and a second pressing part 72. The first elastic element 5 elastically connects the rod-shaped body 32 to the slider 4, so that the force-bearing part 33 has a tendency to swing toward the limiting pressure block 7; Pin 8, corresponding to slot 211, is slidably mounted on slider 4 along the width direction of track 1; The swing arm 6 is hinged to the slider 4, and the pin 8 and the limiting block 7 are both connected to the swing arm 6 in a transmission. Among them, the swing arm 6 swings, drives the pin 8 to be in the clearance position for avoiding the slot 211, and drives the limiting block 7 to rotate, so that the first pressing part 71 contacts the force-receiving part 33, and the hook part 31 is in the hook position for connecting with the limiting member 13. The swing arm 6 swings again, driving the pin 8 to the connection position for insertion into the slot 211, and driving the limiting block 7 to rotate, so that the second pressing part 72 contacts the force-receiving part 33, and the hook part 31 is in the unlocked position for avoiding the limiting member 13.

[0039] like Figure 1 As shown, the length direction of track 1 is the X direction, the width direction of track 1 is the Y direction, and the Z direction is usually the vertical upward direction; a first sprocket 11 and a second sprocket 12 are installed at both ends along the length direction of track 1, the chain 2 is in the shape of a ring, located in the groove of track 1 and extending along the length direction of track 1, the first sprocket 11 is connected to the door operator drive, the slider 4 is provided with a hinge part 45 connected to the drag rod, the drag rod is connected to the door, so that the transmission system converts the rotational motion of the door operator into the opening and closing of the door to move the door.

[0040] The swing arm 6 can be driven to swing by tools such as levers and push / pull to realize the action control of the pin 8 and hook 3. When the pin 8 is in the avoidance position and the hook 31 is in the hook engagement position, it is the manual door opening mode. When the pin 8 is in the connection position and the hook 31 is in the unlock position, it is the electric door opening mode. The swing mode of the swing arm 6 during the specific mode switching process is related to the transmission structure of the swing arm 6. Specifically, the first elastic element 5 can be a torsion spring; the limiting element 13 and / or the hook 31 are provided with a guide structure. When the hook 31 contacts the limiting element 13, the guide structure drives the hook 31 to swing upward. When the hook 31 passes the limiting element 13, it falls down, and under the action of the gravity of the door, the hook 31 hooks onto the limiting element 13, such as... Figure 6 As shown in Figure a1, the second crimping part 72 is in contact with the force-receiving part 33, and the hook part 31 is in the unlocked position. In Figure a2, the first crimping part 71 is in contact with the force-receiving part 33, and the hook part 31 is in the engaged position.

[0041] The operation method of the garage door drive system in this embodiment during a power outage is as follows: Using a tool, the swing arm 6 is swung, the pin 8 is in the clearance position, and the hook 31 swings to the hook engagement position. At this time, the chain 2 and the slider 4 are separated. The door is manually lifted and the slider 4 is pushed to move along the track 1 until the hook 31 contacts the limiting member 13. The hook 3 then swings against the elastic force of the first elastic member 5. When the slider 4 moves, the hook 31 passes the limiting member 13 and the hook 3 returns to its original position. After the operator leaves the door, the slider 4 limits the position of the door by hooking the hook 31 with the limiting member 13. At this time, people and vehicles can pass safely.

[0042] In this embodiment, the garage door drive system does not require personnel to lift the door after a power outage, thus limiting the door's movement and ensuring safety.

[0043] In addition, if it is necessary to use electric power to drive the slider 4 to move the door again, the tool arm 6 is swung to make the pin 8 be in the connection position and the hook 31 swing to the unlock position. After the door is moved to the closed position, the slider 4 is reconnected to the chain 2. After the door motor is started, it drives the chain 2 to rotate and thus drives the door to open and close.

[0044] By installing a limiting component 13 on the track 1 and a hook 3 that can swing relative to the limiting component 13 on the slider 4, the limiting pressure block 7 that drives the hook 3 to swing and the pin 8 that is inserted into the connector 21 on the chain 2 are all linked with the swing arm 6. The swing arm 6 enables the hook 3 to be in an avoidance state and the slider 4 to be connected to the chain 2 when the door is opened by electric drive. When the door is opened by manual operation, the hook 3 is in an effective state and the slider 4 is connected to the chain 2, which meets the usage requirements of the garage door. At the same time, after the power is cut off, the hook 3 can be hooked to the limiting component 13 on the track 1 to ensure the safety after the door is opened.

[0045] In one exemplary embodiment, such as Figures 2-6 As shown, the slider 4 is provided with a channel 40 for the connection member 21 to pass through; The limiting block 7 rotates around the axis of the pin 8. The swing arm 6 is positioned on the pin 8 along the axial direction and is hinged to the slider 4 through the pin 8, thereby connecting the pin 8 and the swing arm 6 in a transmission manner. The limiting block 7 is located between the channel 40 and the swing arm 6. The slider 4 is provided with a first stop structure 41 for limiting the unidirectional rotation of the limiting block 7. The limiting pressure block 7 is fixedly provided with a driven gear group 74, the swing arm 6 is fixedly provided with a driving gear group 61, and also includes a second elastic member 9. The second elastic member 9 elastically connects the swing arm 6 and the slider 4, so that the driven gear group 74 and the driving gear group 61 are in contact and connected, thereby drivingly connecting the limiting pressure block 7 and the swing arm 6. Swing the swing arm 6 in the opposite direction to the rotation direction of the limiting block 7, changing the distance between the limiting block 7 and the swing arm 6 along the axis, that is, the relative position of the driving gear set 61 and the driven gear set 74 changes along the rotation axis of the limiting block 7, so that the pin 8 moves between the clearance position and the connection position. Swing arm 6 in the same direction as the rotation direction of limit pressure block 7 to drive limit pressure block 7 to rotate, and keep the relative position relationship between drive gear group 61 and driven gear group 74 unchanged, switching the position of first pressing part 71 and second pressing part 72.

[0046] The elastic force provided by the second elastic element 9 along the axis of the pin 8 not only maintains good contact between the driven gear 74 and the driving gear 61, but also allows the pin 8 to move away from the connector 21 under the action of external force. At the same time, it provides an elastic restoring force for the pin 8 toward the connector 21, so that when the drive chain 2 rotates after the gantry is started, the connector 21 enters the channel 40 and squeezes the pin 8 to overcome the elastic force of the second elastic element 9. When the slot 211 on the connector 21 moves to the side of the pin 8, the pin 8 moves and inserts into the slot 211 under the action of the elastic restoring force of the second elastic element 9.

[0047] Specifically, the swing arm 6 is positioned and installed on the pin 8 along the axial direction of the pin 8. Two retaining ring mounting slots can be provided on the pin 8, and retaining rings can be installed in the retaining ring mounting slots to fix the axial position of the swing arm 6 on the pin 8 from both sides; or the swing arm 6 can be fixedly connected to the pin 8.

[0048] The limiting block 7 and the pin 8 are coaxially arranged, and the axial position of the swing arm 6 relative to the pin 8 is fixed, so that the pin 8 and the swing arm 6 move along the axial direction of the pin 8. The first stop structure 41 is used to limit the rotation direction of the limiting block 7. The swing arm 6 swings in the opposite direction to the rotation direction of the limiting block 7, changing the axial distance between the limiting block 7 and the swing arm 6, driving the pin 8 to move. The swing arm 6 swings in the same direction as the rotation direction, converting the swing arm 6 around the axis of the pin 8 into the rotation of the limiting block 7. The positions of the first pressing part 71 and the second pressing part 72 are switched cyclically. The actions of the pin 8 and the hook 31 are completed step by step in one reciprocating swing of the swing arm 6, improving the recognizability of the mode switching operation.

[0049] Specifically, during the reciprocating swing of the swing arm 6, the pin 8 moves first, and then the limit block 7 rotates, which is the swing of the hook 3. After each operation, the state of the swing arm 6 is the same, ensuring the integrity of each operation and thus ensuring the safety of the garage door transmission system.

[0050] In one exemplary embodiment, such as Figure 4 , Figures 7-14 As shown, when the pin 8 is inserted into the slot 211, the insertion depth of the pin 8 in the slot 211 is H; The driven gear assembly 74 includes guide blocks 743 and axial limiting blocks 741 arranged alternately in a ring around the axis. The guide blocks 743 are provided with a first guide slope 744 facing the drive gear assembly 61. The axial limiting blocks 741 are provided with a limiting plane 742 perpendicular to the axis. One end of the first guide slope 744 protrudes from the limiting plane 742. The other end of the first guide slope 744 forms a groove 740 with the adjacent axial limiting block 741. The distance H between the bottom of the groove 740 and the limiting plane 742 along the axis is . The drive gear assembly 61 includes a reference surface 611 located on the rocker arm 6 and a push block 612 protruding from the reference surface 611. The push block 612 matches the slot 740 and has a second guide slope 613. When the swing arm 6 swings in the opposite direction to the rotation direction of the limit block 7: The first guide ramp 744 contacts and moves relative to the second guide ramp 613, driving the swing arm 6 to move away from the channel 40. When the push block 612 passes the first guide ramp 744 and contacts the limiting plane 742, the pin 8 is in the avoidance position. Alternatively, the push block 612 contacts the limiting plane 742 and moves relative to it until the push block 612 is located in the slot 740 and the first guide slope 744 and the second guide slope 613 are in complete contact, at which point the pin 8 is in the connection position. When the push block 612 contacts the limiting plane 742 or when the push block 612 is in the slot 740, the swing arm 6 swings in the same direction as the rotation direction of the limiting pressure block 7, so that the limiting pressure block 7 rotates.

[0051] Specifically, such as Figure 7 As shown, the first guide slope 744 protruding from the limiting plane 742 means that the first guide slope 744 extends outward along the axial direction relative to the limiting plane 742, forming a stepped structure between the guide block 743 and the limiting plane 742. When the push block 612 contacts the limiting plane 742, it plays a one-way limiting role. In addition, the side of the slot 740 away from the first guide slope 744 also forms a stepped structure. When the push block 612 is located in the slot 740, the stepped structure plays a one-way limiting role, so that the rotation of the swing arm 6 relative to the limiting pressure block 7 can only occur in the opposite direction to the rotation direction of the limiting pressure block 7. The bottom of the slot 740 refers to the point where the distance between the contact position of the push block 612 and the slot 740 along the axial direction of the pin 8 and the limiting plane 742 is the largest when the push block 612 is located in the slot 740.

[0052] like Figure 13 As shown, solid arrows indicate the direction of swing of the swing arm 6 opposite to the direction of rotation of the limiting block 7, while hollow arrows indicate the direction of swing of the swing arm 6 in the same direction as the direction of rotation of the limiting block 7. In state S1, the pin 8 is in the connected position and the hook 31 is in the unlocked position, which is the electric door opening mode. At this time, the second pressing part 72 is in contact with the force receiving part 33. Then, swing arm 6 swings in the opposite direction to the rotation direction of limit block 7. The first guide slope 744 contacts the second guide slope 613 and moves relative to it, driving swing arm 6 to move away from channel 40. When push block 612 passes the first guide slope 744 and contacts limit plane 742, pin 8 is in the clearance position, which is state S2 - pin 8 is in the clearance position and hook 31 is in the unlock position. At this time, push block 612 contacts limit plane 742. Then swing arm 6 in the same direction as the rotation direction of limit block 7, so that limit block 7 rotates and the first pressing part 71 contacts the force receiving part 33, which is the S3 state - the pin 8 is in the avoidance position and the hook part 31 is in the hooking position, which is the manual door opening mode. Then, swing arm 6 swings in the opposite direction to the rotation direction of limit block 7. Push block 612 contacts limit plane 742 and moves relative to it until push block 612 is in slot 740 and the first guide slope 744 and the second guide slope 613 are in complete contact. At this time, pin 8 is in the connection position, which is state S4 - pin 8 is in the connection position and hook 31 is in the hook position. At this time, push block 612 is in slot 740. Then swing the arm 6 in the same direction as the rotation of the limiting block 7 to make the limiting block 7 rotate, so that the second pressing part 72 contacts the force receiving part 33, which is the S5 state - the pin 8 is in the connected position and the hook part 31 is in the unlocked position (same as the S1 state).

[0053] Figure 14 The diagram shows the positional change of the pin 8 relative to the slot 211 during the transition from state S1 to state S4.

[0054] The limiting plane 742 and the slot 740, which are circumferentially arranged on the driven tooth assembly 74 of the limiting block 7, form a unidirectional guide. Combined with the unidirectional stop of the limiting block 7 by the first stop structure 41 on the slider 4, the swing arm 6 rotates relative to the limiting block 7. By changing between the states of the push block 612 contacting the limiting plane 742 and contacting the slot 740, and by matching the axial distance between the bottom of the limiting plane 742 and the slot 740 with the insertion depth of the pin 8, the swing arm 6 can rotate. The axial position of the swing drive pin 8 is changed; the limiting plane 742 arranged around the driven gear group 74 in the circumferential direction and the same side of the slot 740 both form a stepped structure. The stepped structure contacts the push block 612, so that the swing drive limiting pressure block 7 in the other direction of the swing arm 6 rotates synchronously with the swing arm 6 and keeps the relative position relationship between the drive gear group 61 and the driven gear group 74 unchanged, realizing the switching of the first pressing part 71 and the second pressing part 72. The structure of the driven gear group 74 and the drive gear group 61 is simple and easy to form.

[0055] Specifically, the number of annularly spaced guide blocks 743 and axial limiting blocks 741 is N, and the number of annularly spaced first pressing parts 71 and second pressing parts 72 is also N, where N is an even number, and the annular distribution pattern is the same, ensuring that the swing angle of the swing arm 6 is the same in both directions, and enabling continuous cyclic repetitive motion. The number of push blocks 612 on the swing arm 6 is also N, ensuring the stability of the swing posture of the swing arm 6; Figure 4 , Figure 12As shown, a circular tube 42 is provided on the slider 4, and the limiting pressure block 7 is rotatably engaged with the outer circumferential surface of the circular tube 42. The first stop structure 41 is located on the slider 4 on one side of the circular tube 42, and the pin 8 passes through the central hole of the circular tube 42. By providing the circular tube 42 on the slider 4 and rotatably engaging the limiting pressure block 7 with the circular tube 42, the pin 8 is isolated from the limiting pressure block 7, preventing the limiting pressure block 7 from being moved by the pin 8.

[0056] In one exemplary embodiment, such as Figure 5 , Figure 13 As shown, the second elastic element 9 is a conical spring. The second elastic element 9 is sleeved outside the pin 8. The swing arm 6 is provided with a connecting hole 62. One end of the second elastic element 9 is connected to the connecting hole 62, and the other end of the second elastic element 9 is connected to the slider 4. When the swing arm 6 swings, the second elastic element 9 applies a spring force to the swing arm 6 in the same direction as the rotation of the limiting pressure block 7.

[0057] A conical spring is used as the second elastic element 9, and one end of the conical spring is connected to the connecting hole 62 on the swing arm 6. The second elastic element 9 can not only provide the elastic restoring force for driving the pin 8 to move, but also provide the elastic restoring force in the same direction as the rotation of the limit block 7. After the swing arm 6 swings to change the position of the pin 8, the swing arm 6 is driven to swing under the torsional elastic force of the second elastic element 9, thereby realizing the rotation of the limit block 7. This makes the operation of driving the swing arm 6 to swing simpler and more convenient. Only one person is needed to complete the action of the pin 8 and the limit block 7. This means that the opening and closing of the door after a power outage can be completed by one person.

[0058] Specifically, the swing arm 6 is provided with a wire hole 63, and a pull wire is connected to the wire hole 63 to drive the swing arm 6 to swing. Of course, the pull wire can also be replaced with a pull rod. By manually pulling the pull wire once, the continuous action of moving the pin 8 and rotating the limit block 7 can be achieved.

[0059] The operation method of the garage door drive system in this embodiment during a power outage is as follows: When the swing arm 6 is manually pulled once, the pin 8 is in the clearance position, and then the swing arm 6 automatically resets, and the hook 31 swings to the hook engagement position. At this time, the chain 2 and the slider 4 are separated. The door is manually lifted and the slider 4 is pushed to move along the track 1 until the hook 31 contacts the limiting member 13. The hook 3 then swings against the elastic force of the first elastic member 5. When the slider 4 moves, the hook 31 passes the limiting member 13 and the hook 3 returns to its original position. After the operator leaves the door, the slider 4 limits the position of the door by hooking the hook 31 with the limiting member 13. At this time, people and vehicles can pass safely.

[0060] In the event of a power outage, after opening the garage door, when you need to close it: When the swing arm 6 is manually pulled once, the pin 8 is in the connection position. Due to gravity, the hook 31 is difficult to disengage from the limiting member 13 and cannot swing. The first pressing part 71 contacts the force-receiving part 33 to restrict the rotation of the limiting pressing block 7. The swing arm 6 cannot swing in the opposite direction through the second elastic member 9. As the door is pushed upward manually, the slider 4 moves forward, the hook 31 moves away from the limiting member 13, the swing arm 6 swings in the opposite direction by the torsional elastic force of the second elastic member 9, the limiting pressure block 7 rotates, and at the same time limits the hook 31 to the unlock position. Then, the door is manually moved downwards until it is in the closed position. The latch 8 is then inserted into the slot 211 on the connector 21 on the chain 2. When power is restored, the door can be opened and closed by electric power.

[0061] In the previous exemplary embodiment, such as Figures 4-5 As shown, it also includes a spring mounting base 43, which is detachably mounted on the slider 4. The spring mounting base 43 is provided with a side opening groove 432, which is engaged with the end of the second elastic member 9. A through hole 431 is provided in the center of the side opening groove 432, and the through hole 431 is slidably connected to the pin 8.

[0062] A spring mounting base 43 is provided that can be detachably installed on the slider 4 to facilitate the assembly of the limiting block 7, the swing arm 6 and the second elastic element 9. Specifically, the large end of the second elastic element 9 is fixedly connected to the spring mounting base 43 by a snap-fit ​​connection.

[0063] In one exemplary embodiment, such as Figures 3-5 As shown, the two ends of the connector 21 are provided with side guide surfaces 213 corresponding to the pin 8. When the side guide surfaces 213 contact the pin 8, the second elastic element 9 is further compressed. An extension arm 321 is provided on one side of the rod-shaped body 32 corresponding to the connector 21. A protrusion 322 is provided on the extension arm 321, and a recess 212 corresponding to the protrusion 322 is provided on the connector 21. When the connector 21 moves in the channel 40, the protrusion 322 contacts the connector 21, driving the hook 31 to swing away from the limiting member 13. The distance between the recess 212 and the end of the connector 21 on one side of the hook 31 is L1, and the distance between the slot 211 and the length of the connector 21 is L2. L1 and L2 are adapted to make the slider 4 connected to the chain 2 for transmission. The protrusion 322 is located in the recess 212, so that the force-bearing part 33 contacts the limiting pressure block 7.

[0064] Specifically, the recess 212 is only used to provide clearance for the protrusion 322, so as to prevent the protrusion 322 from contacting the connector 21 and changing the posture of the hook 3 after the slider 4 is connected to the chain 2, so that the posture of the hook 3 is completely controlled by the limiting block 7; the position of the slot 211 on the connector 21 is such that when the door is manually opened to the open position, before the protrusion 322 contacts the connector 21 after the door motor is started, the pin 8 is located in the slot 211 to ensure that the door will not fall; L1 and L2 are compatible. After the hook 31 is disengaged from the limiting member 13, the pin 8 and the connector 21 are relatively displaced until the pin 8 contacts the slot 211. After the slider 4 is driven by the chain 2, the protrusion 322 is located in the recess 212.

[0065] After a power outage, when the door is manually opened to the open position so that the hook 31 of the hook 3 engages with the limiting member 13, if power is restored, and the slider 4 is reconnected to the chain 2 in the open position, the operation process of the garage door transmission system in this embodiment is as follows: First, due to the influence of the door's weight and the angle of the hook 31, the posture of the hook 3 is limited by the limiting member 13. When the swing arm 6 is manually pulled once, causing it to swing, the pin 8 is in the connecting position, making it difficult for the hook 31 to disengage from the limiting member 13. Therefore, the swing arm 6 cannot swing in the opposite direction under the action of the second elastic member 9. Figure 13 As shown in S4, the swing arm 6 is in a vertical position; Start the door operator to make the chain 2 rotate, which drives the connector 21 to move from the closed position to the open position. During the process of entering the channel 40, the connector 21 squeezes the pin 8 to compress the second elastic element 9, and the pin 8 is inserted into the slot 211. Then, the connector 21 lifts the protrusion 322, causing the hook 31 to swing away from the limiting member 13 and disengage from it. Under the torsional elastic force of the second elastic member 9, the swing arm 6 swings in the same direction as the rotation of the limiting block 7, and the limiting block 7 rotates, as... Figure 13 In step (S5), the second pressing part 72 is switched to the position facing the force-receiving part 33. At the same time, the slider 4 and the connector 21 are relatively displaced, so that the pin 8 contacts the slot 211, the protrusion 322 and the recess 212 are aligned, the second pressing part 72 contacts the force-receiving part 33, and the hook 3 returns to the unlocked position, thus completing the switch of the garage door drive system from manual to electric mode.

[0066] By setting an extension arm 321 and a protrusion 322 on the hook 3 corresponding to the connector 21, after power is applied, the connector 21 moves toward the channel 40 located in the open position and is inserted into the pin 8. The protrusion 322 applies force to the rod-shaped body 32 on the side of the hook 31, causing the hook 31 to separate from the limiting member 13. Combined with the torsional elastic force of the second elastic member 9, the swing arm 6 swings, so that the hook 31 is in the unlocked position. The garage door transmission system can be switched from manual to electric state by swing arm 6 with one operation. After power failure, after manually opening and closing the door, the garage door can be directly connected to the door operator after power is restored. The state of the swing arm 6 after manually opening the door is identifiable, thereby determining whether the garage door transmission system is in a state that can be connected to the door operator.

[0067] In the previous exemplary embodiment, such as Figure 5 As shown, the protrusion 322 is provided with a top guide surface 3221, which contacts the end of the connector 21, thereby lifting the protrusion 322.

[0068] By contacting the top guide surface 3221 with the end of the connector 21, the horizontal force is decomposed into an upward force, thereby causing the protrusion 322 to swing. Specifically, the top guide surface 3221 has two locations, corresponding to the two ends of the connector 21 in the length direction, so that the connector 21 can reciprocate within the channel 40.

[0069] In one exemplary embodiment, such as Figure 4 , Figure 9 , Figure 10 , Figure 12 As shown, the first stop structure 41 includes a first unidirectional limiting tooth 411 distributed in an array along the circumferential direction, and a first guide surface 412 is provided on the first unidirectional limiting tooth 411. The limiting block 7 is provided with a second stop structure 73 on the side opposite to the driven tooth group 74. The second stop structure 73 includes a second unidirectional limiting tooth 731 arranged in an array with the rotation center of the limiting block 7 as the center. The number of the second unidirectional limiting teeth 731 is the same as the number of the first unidirectional limiting teeth 411. The second unidirectional limiting teeth 731 are provided with a second guide surface 732. A limiting groove 413 is formed between the first guide surface 412 and the adjacent first one-way limiting tooth 411 to accommodate the second one-way limiting tooth 731. The limiting groove 413 is used to restrict the rotation of the limiting block 7 in one direction. The first guide surface 412 contacts and slides relative to the second guide surface 732 to guide the limiting block 7 to rotate in another direction, so that the second one-way limiting tooth 731 moves from one limiting groove 413 to another adjacent limiting groove 413, thereby switching the positions of the first pressing part 71 and the second pressing part 72. The first one-way limiting tooth 411 restricts the one-way rotation of the limiting block 7.

[0070] During the cyclic operation of the garage door transmission system, when the pull cable is pulled and a "click" sound is heard, the push block 612 switches between the limiting plane 742 and the slot 740. After the pull cable is released, the limiting pressure block 7 rotates to switch the positions of the first pressing part 71 and the second pressing part 72. When the switching is completed, the second one-way limiting tooth 731 moves from one limiting groove 413 to another adjacent limiting groove 413, and a "click" sound is heard again. The first one-way limiting tooth 411 restricts the one-way rotation of the limiting pressure block 7 and realizes the positioning switch of the first pressing part 71 and the second pressing part 72. The total number of the first pressing part 71 and the second pressing part 72 can be equal to the number of the first one-way limiting teeth 411. The number of the first one-way limiting teeth 411 can be twice the number of the guide blocks 743, that is, the single rotation angle of the limiting pressure block 7 is the same as the single swing angle of the swing arm 6.

[0071] By setting the first stop structure 41 as a plurality of circumferentially arranged first one-way limiting teeth 411 with a first guide surface 412, and correspondingly setting a plurality of circumferentially arranged second one-way limiting teeth 731 and second guide surfaces 732 on the limiting block 7 to form a second stop structure 73, the one-way fixed angle rotation of the limiting block 7 is realized, and the first stop structure 41 and the second stop structure 73 can be integrally formed with the slider 4 and the limiting block 7 respectively, so that after the slider 4 and the limiting block 7 are assembled, the one-way limiting of the rotation of the limiting block 7 can be realized, which facilitates the assembly of the relevant structures of the limiting block 7.

[0072] In one exemplary embodiment, such as Figures 9-10 As shown, the limiting block 7 has two first pressing parts 71 and two second pressing parts 72. The two first pressing parts 71 are distributed along the first straight line direction, and the two second pressing parts 72 are distributed along the second straight line direction. The first straight line direction is perpendicular to the second straight line direction, and the intersection point is located on the axis. There are two guide blocks 743 and two axial limiting blocks 741. Specifically, the guide block 743 is set in the second pressing part 72, and the axial limiting block 741 is set in the first pressing part 71. The swing angle of the swing arm 6 in the direction opposite to the rotation direction of the limiting block 7 and the swing angle in the direction in the same direction as the rotation direction of the limiting block 7 are both 90 degrees.

[0073] Specifically, such as Figure 3 , Figure 6As shown, the force-bearing part 33 is located directly below the limiting block 7. The swing angle of the swing arm 6 is set to 90 degrees. After swinging in the opposite direction to the rotation direction of the limiting block 7, the swing arm 6 is in a vertical state, which is convenient for driving by pulling with a cable. The distribution of the two first pressing parts 71 and the two second pressing parts 72 along the circumference of the limiting block 7 is adapted to the distribution of the guide block 743 and the axial limiting block 741 along the circumference of the limiting block 7. The two guide blocks 743 are symmetrical about the axis of the pin 8, and the two axial limiting blocks 741 are symmetrical about the axis of the pin 8. Both block 743 and axial limiting block 741 occupy one-quarter of the circumference of limiting pressure block 7; the distance between the first pressing part 71 and the axis of the pin 8 is less than the distance between the second pressing part 72 and the axis of the pin 8; the outer circumferential surface of the limiting pressure block 7 in the rotation direction can be elliptical, thereby directly forming two first pressing parts 71 and two second pressing parts 72 on the outer circumferential surface; there are two push blocks 612 on the swing arm 6 and they are symmetrical about the axis of the pin 8. The two push blocks 612 are connected to the driven gear group 74, so that the driving force of the swing arm 6 is applied to the driven gear group 74 more stably.

[0074] In one exemplary embodiment, such as Figure 2 , Figure 5 As shown, the slider 4 is provided with a first swing direction limiting block 46 and a second swing direction limiting block 44, and the swing arm 6 swings around the pin 8 between the first swing direction limiting block 46 and the second swing direction limiting block 44. When the first swing direction limiting block 46 contacts the swing arm 6, the pin 8 is in the avoidance position or the connection position. When the second swing direction limiting block 44 contacts the swing arm 6, the first pressing part 71 or the second pressing part 72 contacts the force-receiving part 33.

[0075] Two limiting blocks are set on the slider 4 along the swing direction of the swing arm 6 to position and limit the swing position of the swing arm 6, ensuring the accuracy of the swing arm 6 driving the pin 8 to move and the limiting block 7 to rotate.

[0076] When the second elastic element 9 is a conical spring, the conical spring has sufficient elastic force to reset the swing arm 6 to contact the second swing direction limiting block 44.

[0077] The above description is an explanation of the present invention and not a limitation thereof. The scope of the present invention is defined by the claims. Within the scope of protection of the present invention, any form of modification may be made.

Claims

1. A garage door transmission system, characterized in that: include, The track (1) and the chain (2) rotatably mounted in the track (1), with a slot (211) on the connector (21) on the chain (2); The slider (4) is slidably mounted on the track (1); The limiting component (13) is fixed on the track (1) corresponding to the position of the slider (4) when the door is opened; The hook (3) includes a rod-shaped body (32) rotatably mounted on the slider (4), one end of the rod-shaped body (32) is provided with a hook (31), and the other end of the rod-shaped body (32) is provided with a force-bearing part (33). The limiting pressure block (7) is rotatably mounted on the slider (4). The outer peripheral surface of the limiting pressure block (7) in the rotation direction is provided with a first pressing part (71) and a second pressing part (72). The first elastic element (5) elastically connects the rod-shaped body (32) to the slider (4), so that the force-bearing part (33) has a tendency to swing toward the limiting pressure block (7); The pin (8) corresponds to the slot (211) and is slidably mounted on the slider (4) along the width direction of the track (1); The swing arm (6) is hinged to the slider (4), and the pin (8) and the limiting block (7) are both connected to the swing arm (6) in a transmission manner. The swing arm (6) swings, drives the pin (8) to be in the clearance position for avoiding the slot (211), and drives the limiting block (7) to rotate, so that the first pressing part (71) contacts the force-receiving part (33), and the hook part (31) is in the hook position for connecting with the limiting member (13). The swing arm (6) swings again, driving the pin (8) to the connection position for insertion into the slot (211), and driving the limiting block (7) to rotate so that the second pressing part (72) contacts the force-bearing part (33), and the hook part (31) is in the unlocked position for avoiding the limiting member (13).

2. The garage door transmission system as described in claim 1, characterized in that: The slider (4) is provided with a channel (40) for the connection (21) to pass through. The limiting block (7) rotates around the axis of the pin (8), the swing arm (6) is positioned and installed on the pin (8) along the axis, and is hinged to the slider (4) through the pin (8). The limiting block (7) is located between the channel (40) and the swing arm (6). The slider (4) is provided with a first stop structure (41) for limiting the unidirectional rotation of the limiting block (7). The limiting pressure block (7) is fixedly provided with a driven gear group (74), the swing arm (6) is fixedly provided with a driving gear group (61), and also includes a second elastic member (9). The second elastic member (9) elastically connects the swing arm (6) and the slider (4) so ​​that the driven gear group (74) and the driving gear group (61) are in contact and connected. Swing the swing arm (6) in the opposite direction to the rotation direction of the limiting block (7) to change the distance between the limiting block (7) and the swing arm (6) along the axis, so that the pin (8) moves between the clearance position and the connection position; Swing the arm (6) in the same direction as the rotation direction of the limiting pressure block (7) to drive the limiting pressure block (7) to rotate and switch the positions of the first pressing part (71) and the second pressing part (72).

3. The garage door transmission system as described in claim 2, characterized in that: When the pin (8) is inserted into the slot (211), the insertion depth of the pin (8) in the slot (211) is H; The driven gear assembly (74) includes guide blocks (743) and axial limiting blocks (741) arranged alternately in a ring around the axis. The guide blocks (743) are provided with a first guide slope (744) facing the drive gear assembly (61). The axial limiting blocks (741) are provided with a limiting plane (742) perpendicular to the axis. One end of the first guide slope (744) protrudes from the limiting plane (742). The other end of the first guide slope (744) forms a groove (740) with the adjacent axial limiting block (741). The distance H between the bottom of the groove (740) and the limiting plane (742) along the axis is . The drive gear assembly (61) includes a reference surface (611) located on the rocker arm (6) and a push block (612) protruding from the reference surface (611). The push block (612) matches the slot (740), and the push block (612) is provided with a second guide slope (613). When the swing arm (6) swings in the opposite direction to the rotation direction of the limiting block (7): The first guide ramp (744) contacts and moves relative to the second guide ramp (613) to drive the swing arm (6) to move away from the channel (40). When the push block (612) passes the first guide ramp (744) and contacts the limiting plane (742), the pin (8) is in the avoidance position. Alternatively, the push block (612) contacts and moves relative to the limiting plane (742) until the push block (612) is located in the slot (740) and the first guide slope (744) and the second guide slope (613) are in complete contact, at which point the pin (8) is in the connection position; When the push block (612) contacts the limiting plane (742) or when the push block (612) is located in the slot (740), the swing arm (6) swings in the same direction as the rotation direction of the limiting pressure block (7) to make the limiting pressure block (7) rotate.

4. The garage door transmission system as described in claim 3, characterized in that: The second elastic element (9) is a conical spring. The second elastic element (9) is sleeved outside the pin (8). The swing arm (6) is provided with a connecting hole (62). One end of the second elastic element (9) is connected to the connecting hole (62), and the other end of the second elastic element (9) is connected to the slider (4). When the swing arm (6) swings, the second elastic element (9) applies a spring force to the swing arm (6) in the same direction as the rotation of the limiting pressure block (7).

5. The garage door transmission system as described in claim 4, characterized in that: It also includes a spring mounting base (43), which is detachably mounted on the slider (4). The spring mounting base (43) is provided with a side opening groove (432), which is engaged with the end of the second elastic member (9). The center of the side opening groove (432) is provided with a through hole (431), which is slidably connected to the pin (8).

6. The garage door transmission system as described in claim 4, characterized in that: The connector (21) has side guide surfaces (213) at both ends corresponding to the pin (8). When the side guide surfaces (213) contact the pin (8), the second elastic element (9) is further compressed. An extension arm (321) is provided on one side of the rod-shaped body (32) corresponding to the connector (21), and a protrusion (322) is provided on the extension arm (321), and a recess (212) corresponding to the protrusion (322) is provided on the connector (21). When the connector (21) moves in the channel (40), the protrusion (322) contacts the connector (21) and drives the hook (31) to swing away from the limiting member (13); The distance between the recess (212) and the end of the connector (21) on one side of the hook (31) is L1, and the distance between the slot (211) and the connector (21) along the length direction is L2. L1 and L2 are adapted to make the slider (4) and the chain (2) connected in transmission. The protrusion (322) is located in the recess (212), so that the force-bearing part (33) contacts the limiting pressure block (7).

7. The garage door drive system as described in claim 6, characterized in that: The protrusion (322) is provided with a top guide surface (3221), which contacts the end of the connector (21) to lift the protrusion (322).

8. The garage door transmission system as described in claim 3, characterized in that: The first stop structure (41) includes a first unidirectional limiting tooth (411) arranged in an array along the circumferential direction, and a first guide surface (412) is provided on the first unidirectional limiting tooth (411). The limiting block (7) is provided with a second stop structure (73) on the side away from the driven tooth group (74). The second stop structure (73) includes a second unidirectional limiting tooth (731) arranged in an array with the rotation center of the limiting block (7) as the center. The number of the second unidirectional limiting teeth (731) is the same as the number of the first unidirectional limiting teeth (411). The second unidirectional limiting teeth (731) is provided with a second guide surface (732). A limiting groove (413) is formed between the first guide surface (412) and the adjacent first one-way limiting tooth (411) to accommodate the second one-way limiting tooth (731). The limiting groove (413) is used to restrict the rotation of the limiting block (7) in one direction. The first guide surface (412) contacts and slides relative to the second guide surface (732) to guide the limiting block (7) to rotate in another direction, so that the second one-way limiting tooth (731) moves from one limiting groove (413) to another adjacent limiting groove (413), thereby switching the positions of the first pressing part (71) and the second pressing part (72).

9. The garage door transmission system as described in claim 3, characterized in that: The limiting block (7) is provided with two first pressing parts (71) and two second pressing parts (72). The two first pressing parts (71) are distributed along the first straight line direction, and the two second pressing parts (72) are distributed along the second straight line direction. The first straight line direction is perpendicular to the second straight line direction, and the intersection point is located on the axis. The number of guide blocks (743) and axial limiting blocks (741) is two. The swing angle of the swing arm (6) in the direction opposite to the rotation direction of the limiting block (7) and the swing angle in the direction in the same direction as the rotation direction of the limiting block (7) are both 90 degrees.

10. The garage door transmission system as described in claim 1, characterized in that: The slider (4) is provided with a first swing direction limiting block (46) and a second swing direction limiting block (44), and the swing arm (6) swings around the pin (8) between the first swing direction limiting block (46) and the second swing direction limiting block (44). When the first swing direction limiting block (46) contacts the swing arm (6), the pin (8) is in the avoidance position or the connection position. When the second swing direction limiting block (44) contacts the swing arm (6), the first pressing part (71) or the second pressing part (72) contacts the force-bearing part (33).

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