Anti-falling bolt device for gate

Abstract

The invention discloses a gate anti-falling bolt device which comprises a bolt sleeve, a driving mechanism and a bolt core, the bolt sleeve is of a hollow structure, and a guide channel is formed in the bolt sleeve; the driving mechanism is arranged on the bolt sleeve, and the driving mechanism is provided with a connecting shaft suitable for telescopic movement; the bolt core is arranged in the guide channel of the bolt sleeve in a sliding mode, the connecting shaft of the driving mechanism is suitable for acting the bolt core, and the bolt core is suitable for being driven by the driving mechanism to stretch out to a first station or retract into the bolt sleeve to a second station. The door locking device can lock a door when the door is opened to the corresponding height, and is compact in structure, convenient to use and wide in application range.

Description

Technical Field

[0001] The invention relates to a latch device for preventing a gate from falling. Background Art

[0002] Currently, in the fields of industrial production and construction, the safety of heavy equipment, large doors, and lifting devices is receiving increasing attention. Existing fall prevention devices mostly use mechanical or pneumatic latch structures to prevent heavy objects from accidentally falling, causing personal injury and equipment damage.

[0003] After searching the prior art, we discovered Chinese Patent Publication No. CN219619449U, which discloses a lift anti-fall device. The latch assembly in this patent includes a single-acting cylinder, a latch, and an unpowered spring. The single-acting cylinder drives the latch to lock and unlock. However, during use, we discovered that the pneumatic latch requires an air source and air pipe, making it inconvenient to use outdoors. Furthermore, the air pipe is prone to aging and damage, resulting in high maintenance costs. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a door anti-falling latch device, which can not only lock the door when the door is opened to a corresponding height, but also has a compact structure, is easy to use and has a wide range of applications.

[0005] In order to solve the above technical problems, the technical solution of the present invention is: a door anti-falling latch device, comprising:

[0006] A latch sleeve, the latch sleeve being a hollow structure and having a guide channel therein;

[0007] A driving mechanism, the driving mechanism being arranged on the latch sleeve and provided with a connecting shaft suitable for telescopic movement;

[0008] The latch core is slidably arranged in the guide channel of the latch sleeve, and the connecting shaft of the driving mechanism is suitable for moving the latch core. The latch core is suitable for extending to the first station under the drive of the driving mechanism to be inserted into the corresponding hole of the gate or retracting into the latch sleeve and to the second station to be disengaged from the corresponding hole of the gate.

[0009] Furthermore, the driving mechanism is adapted to operate in a powered state;

[0010] The gate anti-falling latch device further comprises a post-power-off operating mechanism, which is adapted to be actuated when the driving mechanism loses power and cannot operate to cause the latch core to extend or retract into the latch sleeve.

[0011] Furthermore, in order to still be able to lock the door when it is opened to a corresponding height when the drive mechanism is powered off, the post-power-off operating mechanism includes:

[0012] A push-pull electromagnet includes a push rod, the rear end of which is connected to a driving mechanism, and the front end of which is connected to the latch core. When the driving mechanism is powered off and cannot work, the push-pull electromagnet is controlled to be energized to extend the push rod, thereby driving the latch core to extend, and the push-pull electromagnet is controlled to be powered off to retract the push rod, thereby driving the latch core to retract.

[0013] Furthermore, the door anti-fall latch device also includes a power-off switching control device, which includes:

[0014] a current sensor connected to the driving mechanism to detect whether the driving mechanism is energized;

[0015] A position switch provided on the latch sleeve for detecting whether the latch core is in the first position;

[0016] Start / Stop switch;

[0017] A controller is connected to the output ends of the current sensor, the position switch, and the start-stop switch respectively. The controller is also connected to the push-pull electromagnet control. The controller is suitable for controlling the power gain and loss of the push-pull electromagnet according to the signals fed back by the current sensor, the position switch, and the start-stop switch.

[0018] Furthermore, in order to be able to adjust the protruding length of the latch core relative to the latch sleeve, the connecting shaft is a threaded shaft structure;

[0019] The rear end of the latch core is provided with an internal threaded hole, which is threadedly connected to the connecting shaft;

[0020] Wherein, the threaded connection is suitable for adjusting the protruding length of the latch core relative to the latch sleeve through the relative rotation of the connecting shaft and the latch core.

[0021] Furthermore, the door anti-fall latch device further comprises a locking nut, wherein the locking nut is threadedly connected to the connecting shaft;

[0022] The locking nut is adapted to be screwed down to abut against the rear end of the latch core after the extension length of the latch core relative to the latch sleeve is adjusted, so as to lock the relative position of the latch core and the connecting shaft.

[0023] Furthermore, a specific structure of a driving mechanism is provided, wherein the driving mechanism comprises:

[0024] A guide fixing mechanism, the guide fixing mechanism being installed in the latch sleeve and provided with a guide groove;

[0025] a rotational drive source, the rotational drive source being mounted in the guide fixing mechanism and provided with a rotational output shaft;

[0026] a gear connected to a rotation output shaft of the rotation drive source;

[0027] a rack, the rack being slidably disposed in a guide groove of the guide fixing mechanism and meshing with the gear;

[0028] The connecting shaft is fixedly connected to the rack, and the rotary drive source is suitable for converting the rotary motion into the linear telescopic motion of the connecting shaft through the engagement of the gear and the rack.

[0029] Furthermore, the front end of the latch core is a tapered structure.

[0030] Furthermore, the latch sleeve comprises:

[0031] The guide sleeve body is a hollow cylindrical structure;

[0032] The guide sleeve is a cylindrical structure and is embedded and fixed at the outlet end of the guide sleeve body. The circular inner hole of the guide sleeve constitutes the guide channel.

[0033] Furthermore, the gate anti-falling latch device also includes a dustproof bushing, which is arranged between the guide sleeve and the guide sleeve body.

[0034] By adopting the above technical solution, the present invention has the following beneficial effects:

[0035] In the present invention, when the driving mechanism is energized, the extension or retraction of the latch core is implemented by the driving mechanism. Specifically, the driving mechanism is arranged on the latch sleeve and can be directly connected to the latch core through its connecting shaft. When the door is opened to a corresponding height, the driving mechanism drives the connecting shaft to perform telescopic movement, driving the latch core to slide in the guide channel of the latch sleeve, so that the latch core extends out of the latch sleeve to the first working position and is inserted into the corresponding hole position of the door, thereby realizing mechanical locking of the door and preventing the door from falling.

[0036] In addition, when it is detected that the driving mechanism is in a power-off state, the extension or retraction of the latch core can be achieved by the post-power-off operating mechanism. In this state, the power supply state of the electromagnet can be switched by the start-stop switch. When locking is required, the push-pull electromagnet is energized by operating the start-stop switch, and the push-pull electromagnet pushes the latch core to the first position to lock the door. When locking is not required, the push-pull electromagnet is de-energized by operating the start-stop switch, and the latch core is pulled back to the second position, thereby achieving the unlocking state of the door, ensuring that the locking and unlocking states of the door can be effectively controlled under any circumstances;

[0037] In addition, when it is detected that the driving mechanism is in a power-off state, the position switch can also be used to detect whether the pin core is in the first position. When it is detected that the pin core is in the first position, the push-pull electromagnet is controlled to be in an energized state to keep the pin core in the first position.

[0038] In addition, the connecting shaft adopts a threaded shaft structure to cooperate with the internal threaded hole of the pin core. The protruding length of the pin core can be accurately adjusted through relative rotation, and the adjustment position can be reliably locked with the locking nut to meet the use requirements of different working conditions; the tapered structure at the front end of the pin core facilitates alignment and insertion into the locking hole, improving operational convenience; the pin sleeve adopts a combined structure of the guide sleeve body and the guide sleeve, and cooperates with the dustproof bushing to effectively prevent dust from entering, thereby extending the service life of the device.

[0039] To sum up, the gate anti-fall latch device provided by the present invention has a compact structure and reliable operation. It not only realizes the convenient operation of electric drive and wide environmental adaptability, but also has automatic power-off protection function and adjustable extension length function, which significantly improves the safety, reliability and practicality of the anti-fall protection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 The structure diagram of the door anti-falling latch device of embodiment 1 is shown as follows: Figure 1 ;

[0041] Figure 2 The structure diagram of the door anti-falling latch device of embodiment 1 is shown as follows: Figure 2 ;

[0042] Figure 3 This is a front view of the door anti-falling latch device of Example 1;

[0043] Figure 4 This is a schematic structural diagram of a door anti-fall latch device according to a second embodiment;

[0044] Figure 5 This is a schematic structural diagram of a door anti-fall latch device according to a third embodiment;

[0045] Figure 6 Schematic diagram of the structure of the door anti-falling latch device of embodiment 4;

[0046] Figure 7 This is a schematic structural diagram of a door anti-fall latch device according to a fifth embodiment;

[0047] Figure 8 Schematic diagram of the structure of the door anti-falling latch device of embodiment 6. DETAILED DESCRIPTION

[0048] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0049] Example 1: Figure 1-3 As shown, a door anti-falling latch device includes:

[0050] The latch sleeve 1 is a hollow structure, and a guide channel 11 is provided inside the latch sleeve 1;

[0051] A driving mechanism 2 is provided on the latch sleeve 1 and is provided with a connecting shaft 21 suitable for telescopic movement;

[0052] The latch core 3 is slidably arranged in the guide channel 11 of the latch sleeve 1. The connecting shaft 21 of the driving mechanism is suitable for moving the latch core 3. The latch core 3 is suitable for extending to the first station or retracting into the latch sleeve 1 and to the second station under the drive of the driving mechanism 2.

[0053] In this embodiment, the latch core 3 may be directly connected to the connecting shaft 21 of the driving mechanism 2 .

[0054] In this embodiment, the driving mechanism may be an electric cylinder to realize the extension and locking of the latch core 3 ; of course, the driving mechanism may also be other structures.

[0055] In this embodiment, if Figure 1-3 As shown, when the drive mechanism 2 is energized, the extension or retraction of the latch core 3 is implemented by the drive mechanism 2. Specifically, the drive mechanism 2 is mounted on the latch sleeve 1 and connected to the latch core 3 via its connecting shaft 21. When the door is opened to a certain height, the drive mechanism 2 drives the connecting shaft 21 to extend, causing the latch core 3 to slide within the guide channel 11 of the latch sleeve 1. The latch core 3 extends from the latch sleeve 1 to the first position and is inserted into the locking hole of the raised door, thus mechanically locking the door and preventing it from falling. When the door needs to be unlocked, the drive mechanism 2 drives the connecting shaft 21 to retract, causing the latch core 3 to retract into the latch sleeve 1 and to the second position.

[0056] Embodiment 2: This embodiment is basically the same as embodiment 1, except that the driving mechanism 2 is adapted to operate in a power-on state;

[0057] The gate anti-falling latch device further comprises a post-power-off operating mechanism, which is adapted to be actuated when the driving mechanism 2 is powered off and cannot operate to cause the latch core 3 to extend or retract into the latch sleeve 1.

[0058] like Figure 4 As shown, the operating mechanism after power failure includes:

[0059] The push-pull electromagnet 42 includes a push rod, the rear end of the push rod is connected to the driving mechanism 2, and the front end of the push rod is connected to the latch core 3. When the driving mechanism is powered off and cannot work, the push-pull electromagnet 42 is controlled to be energized to extend the push rod, thereby driving the latch core 3 to extend and the push-pull electromagnet 42 is controlled to be powered off to retract the push rod, thereby driving the latch core 3 to retract.

[0060] The gate anti-fall latch device also includes a power-off switching control device, which includes:

[0061] a current sensor connected to the drive mechanism to detect whether the drive mechanism is energized;

[0062] A position switch 43 provided on the latch sleeve 1 for detecting whether the latch core 3 is in the first position;

[0063] Start / Stop switch;

[0064] The controller is connected to the output ends of the current sensor, position switch 43, and start-stop switch respectively. The controller is also connected to the push-pull electromagnet 42 control. The controller is suitable for controlling the power gain and loss of the push-pull electromagnet 42 according to the signals fed back by the current sensor, position switch 43 and start-stop switch.

[0065] In this embodiment, the driving mechanism is connected to the mains power supply, and the push-pull electromagnet 42 is powered by an emergency energy storage device, which can be a battery. The driving mechanism can use a cylinder whose piston can move freely after power is cut off. The cylinder does not maintain pressure after power is cut off and the movement of the pin core 3 will not be restricted.

[0066] Specifically, in this embodiment, since the drive mechanism 2 is not energized, it does not restrict the movement of the latch core 3, and the movement of the latch core 3 is driven by the push-pull electromagnet 42. When the current sensor detects that the drive mechanism 2 is not energized and the position switch 43 detects that the latch core 3 is not in the first position, that is, in the second position, the controller controls the power supply and loss of the push-pull electromagnet 42 by turning the start-stop switch on and off, thereby placing the latch core 3 in the first position or the second position, thereby achieving the function of locking or unlocking the door.

[0067] In addition, when the current sensor detects that the driving mechanism 2 is not powered and the position switch detects that the latch core 3 is in the first position, the push-pull electromagnet 42 can be directly controlled by the controller to be energized to keep the latch core 3 in the first position. When unlocking is required, the push-pull electromagnet 42 is controlled to be de-energized by turning off the start-stop switch, so that the latch core 3 is in the second position.

[0068] In this embodiment, the push-pull electromagnet 42 includes not only a push rod, but also a base, a coil and a spring 41. The coil is installed on the base, the push rod passes through the coil, and a limit ring is provided at the rear end of the push rod. The spring 41 abuts between the base and the limit ring. When the coil of the push-pull electromagnet 42 is energized, the push rod overcomes the elastic force of the spring 41 and moves forward. When the coil of the push-pull electromagnet 42 is de-energized, the push rod resets backward under the action of the elastic force of the spring 41. The push-pull electromagnet 42 is a prior art and will not be described in detail in this embodiment.

[0069] In this embodiment, the controller may be a PLC, but is not limited thereto.

[0070] Example 3: This example is basically the same as Example 1 or Example 2, except that, specifically, Figure 5 As shown, the connecting shaft 21 is a threaded shaft structure;

[0071] The rear end of the latch core 3 is provided with an internal threaded hole, which is threadedly connected to the connecting shaft 21;

[0072] The threaded connection is suitable for adjusting the extension length of the latch core 3 relative to the latch sleeve 1 through the relative rotation of the connecting shaft 21 and the latch core 3 .

[0073] Specifically, such as Figure 5 As shown, the door anti-fall latch device further includes a locking nut 51, which is threadedly connected to the connecting shaft 21;

[0074] The locking nut 51 is adapted to be tightened to abut against the rear end of the latch core 3 after the extension length of the latch core 3 relative to the latch sleeve 1 is adjusted, so as to lock the relative position of the latch core 3 and the connecting shaft 21 .

[0075] In this embodiment, if Figure 5 As shown, the connecting shaft 21 is screwed into the internal threaded hole of the latch core 3. By rotating the connecting shaft 21, the connecting shaft 21 and the latch core 3 generate relative spiral motion, thereby changing the axial position of the latch core 3 in the latch sleeve 1, and realizing the adjustment of the extended length of the latch core 3.

[0076] The locking nut 51 is a hexagonal nut that is threaded onto the connecting shaft 21 and positioned behind the latch core 3. Once the latch core 3 has been adjusted to its desired extension, the connecting shaft 21 is then extended beyond the latch sleeve 1, allowing the locking nut 51 to be rotated with a wrench. This allows the locking nut 51 to move forward along the connecting shaft 21 until its front end abuts against the rear end of the latch core 3, generating an axial compressive force that prevents relative rotation between the connecting shaft 21 and the latch core 3, thereby locking the latch core 3 in its adjusted position.

[0077] Example 4: This example is basically the same as Example 1 or Example 2, except that, specifically, Figure 6 As shown, the front end of the latch core 3 is a tapered structure.

[0078] In this embodiment, if Figure 6 As shown, the front end of the latch core 3 is machined into a tapered structure with a circular angle, the tip of the cone pointing toward the exit of the latch sleeve 1. The bottom of the tapered structure smoothly transitions into the cylindrical main body of the latch core 3. When the latch core 3 extends out of the latch sleeve 1, the tapered front end first contacts the edge of the corresponding locking hole, forming an oblique contact with the hole edge. As the latch core 3 continues to advance, the tapered structure guides the latch core 3 into alignment and entry into the locking hole.

[0079] Example 5: This example is basically the same as Example 1, except that Figure 7 As shown, the latch sleeve 1 includes:

[0080] The guide sleeve body 12 is a hollow cylindrical structure;

[0081] The guide sleeve 13 is a cylindrical structure and is embedded and fixed at the outlet end of the guide sleeve body 12 . The circular inner hole of the guide sleeve 13 constitutes the guide channel 11 .

[0082] Specifically, such as Figure 7 As shown, the gate anti-falling latch device further includes a dustproof bushing 14 , which is disposed between the guide sleeve 13 and the guide sleeve body 12 .

[0083] In this embodiment, if Figure 7 As shown, the guide sleeve body 12 is a hollow cylindrical structure with a square cross-section, forming a housing chamber. The guide sleeve 13 is a cylindrical structure with an outer diameter that matches the inner diameter of the mounting hole of the guide sleeve body 12. The dustproof bushing 14 is made of rubber or polyurethane. Dustproof bushing 14 fills the gap between the guide sleeve 13 and the guide sleeve body 12, forming a sealing lip to prevent the ingress of external dust and impurities.

[0084] Example 6: This example is basically the same as Example 1, except that, specifically, Figure 8 As shown, the driving mechanism includes:

[0085] A guide fixing mechanism 22 is installed in the latch sleeve 1 and is provided with a guide groove;

[0086] A rotary drive source, the rotary drive source is installed in the guide fixing mechanism 22, and the rotary drive source is provided with a rotary output shaft;

[0087] a gear connected to a rotating output shaft of a rotating drive source;

[0088] The rack is slidably arranged in the guide groove of the guide fixing mechanism 22, and the rack is meshed with the gear;

[0089] The connecting shaft 21 is fixedly connected to the rack, and the rotary drive source is suitable for converting the rotary motion into the linear telescopic motion of the connecting shaft 21 through the engagement of the gear and the rack.

[0090] In this embodiment, the rotation driving source is a motor. When the motor drives the gear to rotate, the gear drives the rack meshing with it to move linearly along the guide groove, thereby driving the connecting shaft 21 to perform linear telescopic motion.

[0091] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A door anti-fall latch device, characterized in that: include: A latch sleeve (1), wherein the latch sleeve (1) is a hollow structure, and a guide channel (11) is provided inside the latch sleeve (1); A driving mechanism (2), the driving mechanism (2) being arranged on the latch sleeve (1), the driving mechanism (2) being provided with a connecting shaft (21) suitable for telescopic movement; A latch core (3) is slidably disposed in a guide channel (11) of the latch sleeve (1); a connecting shaft (21) of the drive mechanism (2) is adapted to actuate the latch core (3); and the latch core (3) is adapted to be extended to a first position under the drive of the drive mechanism (2) so as to be inserted into a hole corresponding to the gate, or to be retracted into the latch sleeve (1) and to a second position so as to be disengaged from a hole corresponding to the gate.

2. The door anti-fall latch device according to claim 1, characterized in that: The driving mechanism (2) is suitable for operating in a power-on state; It also includes a post-power-off operating mechanism, which is suitable for being actuated when the drive mechanism (2) loses power and cannot operate to cause the latch core (3) to extend or retract into the latch sleeve (1).

3. The door anti-fall latch device according to claim 2, characterized in that: The post-power-off operating mechanism comprises: A push-pull electromagnet (42) includes a push rod, a rear end of the push rod is connected to the driving mechanism (2), and a front end of the push rod is connected to the latch core (3). When the driving mechanism is powered off and cannot work, the push-pull electromagnet (42) is controlled to be energized so that the push rod is extended, thereby driving the latch core (3) to extend; and the push-pull electromagnet (42) is controlled to be powered off so that the push rod is retracted, thereby driving the latch core (3) to retract.

4. The door anti-fall latch device according to claim 3, characterized in that: It also includes a power-off switching control device, the power-off switching control device including: a current sensor connected to the driving mechanism to detect whether the driving mechanism is energized; A position switch provided on the latch sleeve (1) for detecting whether the latch core (3) is in the first position; Start / Stop switch; A controller is connected to the output ends of the current sensor, the position switch, and the start-stop switch respectively, and is also connected to the push-pull electromagnet (42) for control. The controller is suitable for controlling the power gain and loss of the push-pull electromagnet (42) according to the feedback signals of the current sensor, the position switch, and the start-stop switch.

5. The door anti-fall latch device according to claim 1, characterized in that: The connecting shaft (21) is a threaded shaft structure; The rear end of the latch core (3) is provided with an internal threaded hole, which is threadedly connected to the connecting shaft (21); The threaded connection is suitable for adjusting the extension length of the latch core (3) relative to the latch sleeve (1) through relative rotation of the connecting shaft (21) and the latch core (3).

6. The door anti-fall latch device according to claim 5, characterized in that: It also includes a locking nut (51), wherein the locking nut (51) is threadedly connected to the connecting shaft (21); The locking nut (51) is suitable for being screwed to abut against the rear end of the latch core (3) after the extension length of the latch core (3) relative to the latch sleeve (1) is adjusted, so as to lock the relative position of the latch core (3) and the connecting shaft (21).

7. The door anti-fall latch device according to claim 1, characterized in that: The driving mechanism comprises: A guide fixing mechanism (22), the guide fixing mechanism (22) being installed in the latch sleeve (1), and the guide fixing mechanism (22) being provided with a guide groove; A rotary drive source, the rotary drive source being installed in the guide fixing mechanism (22), and the rotary drive source being provided with a rotary output shaft; a gear connected to a rotation output shaft of the rotation drive source; A rack, the rack being slidably arranged in a guide groove of the guide fixing mechanism (22), and the rack being meshed with the gear; The connecting shaft (21) is fixedly connected to the rack, and the rotary drive source is suitable for converting the rotary motion into the linear telescopic motion of the connecting shaft (21) through the meshing of the gear and the rack.

8. The door anti-fall latch device according to claim 1, characterized in that: The front end of the latch core (3) is in a conical structure.

9. The door anti-fall latch device according to claim 1, characterized in that: The latch sleeve (1) comprises: A guide sleeve body (12), wherein the guide sleeve body (12) is a hollow cylindrical structure; The guide sleeve (13) is a cylindrical structure and is embedded and fixed at the outlet end of the guide sleeve body (12). The circular inner hole of the guide sleeve (13) constitutes the guide channel (11).

10. The door anti-fall latch device according to claim 9, characterized in that: It also includes a dustproof bushing (14), which is arranged between the guide sleeve (13) and the guide sleeve body (12).

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