Mechanical automatic door lock structure for double door

Abstract

The utility model particularly relates to a mechanical automatic door lock structure for a double door. The mechanical automatic door lock structure comprises a fixed door frame, the mounting support and the pin shaft seat are arranged on the fixed door frame, and the pin shaft seat is arranged below the mounting support; the middle of the locking plate is rotationally connected to the pin shaft seat, one end of the locking plate is bent downwards to form a hook lock structure, and the bent position is of an arc chamfer structure; the single-acting cylinder is arranged at one end, close to the hook lock structure, of the mounting support, a telescopic rod of the single-acting cylinder is vertically arranged, a cylinder connector is vertically arranged at the lower end of the telescopic rod, and a bearing is arranged at the lower end of the cylinder connector through a pin shaft; the threaded shaft sleeve is arranged at the end, away from the hook lock structure, of the mounting support, and the guide shaft is vertically arranged in the threaded shaft sleeve in a movable fit mode; the pressing head is arranged at the lower end of the guide shaft, the lower end of the pressing head abuts against the upper side face of the locking plate, and the guide shaft is sleeved with the spring. The single-acting air cylinder drives the bearing to move downwards, and the bearing pushes the hook lock structure of the locking plate to do arc motion.

Description

Technical Field

[0001] This utility model relates to the field of door lock technology with high-pressure cleaning technology, specifically a mechanical automatic door lock structure for double doors. Background Technology

[0002] In the field of high-pressure cleaning technology, sliding door locking control devices need to operate stably in environments filled with cleaning fluid, metal debris, and strong electrostatic interference. Currently, the commonly used motor-driven locking mechanism is susceptible to short-circuit failure due to liquid seepage, as the drive motor and related circuits are constantly exposed to conductive media. Some solutions use electromagnets as the driving component, which avoids the risk of liquid seepage, but these are bulky and require auxiliary mechanisms such as return springs, resulting in reduced space utilization and significantly increased installation complexity. While pneumatic drive solutions offer environmental tolerance advantages, they cannot automatically release the locking device in the event of a sudden power outage due to pneumatic system failure, potentially causing a safety hazard of delayed door opening in emergency situations.

[0003] Existing technologies have not effectively integrated environmental resistance, structural compactness, and power failure self-unlocking function, and there is an urgent need to develop an automatic locking device for moving doors based on the principle of pure mechanical transmission. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a mechanical automatic door lock structure for double doors, so as to improve environmental resistance, structural compactness and realize the function of self-unlocking when power is off.

[0005] To achieve the above objectives, a mechanical automatic door lock structure for double doors is designed, including a fixed door frame, and further comprising: a mounting bracket and a pin seat mounted on the fixed door frame, the pin seat being located below the mounting bracket; a locking plate, rotatably connected to the pin seat in the middle, one end of the locking plate being bent downwards to form a hook lock structure, the bent portion being a rounded chamfer structure; a single-acting cylinder, mounted on the mounting bracket near the hook lock structure, the single-acting cylinder telescopic rod being vertically arranged, the cylinder connector being vertically arranged at the lower end of the telescopic rod, and a bearing being mounted below the cylinder connector via a pin. The cylinder connector is positioned so that it engages with the rotating locking plate via a bearing. A threaded bushing is positioned on the mounting bracket at the end away from the hook-lock structure, and a guide shaft is vertically positioned within the threaded bushing for movable engagement. A pressure head is positioned at the lower end of the guide shaft, with its lower end abutting against the upper side of the locking plate. A protruding stepped structure is provided on the side of the pressure head near the guide shaft. A spring is sleeved on the guide shaft, with one end of the spring abutting against the threaded bushing and the other end abutting against the stepped mechanism of the pressure head. A single-acting cylinder drives the bearing to move downward, and the bearing pushes the hook-lock structure of the locking plate to move in an arc.

[0006] Preferably, the present invention further includes: a bent sensor bracket is provided at the upper end of the mounting bracket, the sensor is vertically mounted on the sensor bracket, the sensor is positioned above the threaded bushing, and a gap is left between the sensor and the threaded bushing to allow the guide shaft to move upward, the sensor being used to detect the guide shaft.

[0007] Preferably, the present invention further includes: a sliding door, which is slidably engaged with a slide rail on a fixed door frame, and a locking block is provided at the top of the sliding door, which conforms to the hook-lock structure of the locking plate.

[0008] Preferably, the present invention further includes: the pin seat and the locking plate are connected by a pin, and a retaining ring is engaged between the pin and the locking plate.

[0009] Preferably, the present invention further includes: the lower end face of the pressure head is a spherical structure.

[0010] Compared with the prior art, the advantages of this utility model are:

[0011] This invention effectively overcomes the short-circuit failure problem caused by the corrosion of conductive media in traditional motor components by optimizing the sealing protection and mechanical linkage design of the drive structure, significantly improving the operational stability of the locking mechanism in environments with high-pressure cleaning fluid, metal debris, and electrostatic interference. The modular mechanical transmission layout ensures the integrity of the drive function while reducing the overall size of the locking device, making it suitable for space-constrained double sliding door installation scenarios. Through the integrated design of the mechanical self-unlocking component, it can trigger automatic reset in the event of a sudden power outage, releasing the sliding door from its locked state and avoiding the risk of emergency passage blockage caused by pressure loss in traditional pneumatic solutions. Attached Figure Description

[0012] Figure 1 This is a partial schematic diagram of the door lock part of this utility model;

[0013] Figure 2 This is a schematic diagram of the overall structure of the sliding door and door lock of this utility model.

[0014] Figure 3 This is a schematic diagram of the cooperation between the sliding door and the door lock structure of this utility model;

[0015] In the diagram: 1. Mounting bracket; 2. Locking plate; 3. Pin seat; 4. Snap ring; 5. Pin; 6. Cylinder connector; 7. Bearing; 8. Single-acting cylinder; 9. Sensor bracket; 10. Guide shaft; 11. Threaded bushing; 12. Nylon indenter; 13. Spring; 14. Fixed door frame; 15. Left sliding door; 16. Right sliding door; 17. Locking block; 18. Sensor. Detailed Implementation

[0016] To make the purpose, principle and structure of this utility model clearer, the following description is provided in conjunction with the accompanying drawings and specific embodiments.

[0017] like Figure 1-3 As shown, this embodiment provides a mechanical automatic door lock structure for double doors, including a fixed door frame 14, on which a mounting bracket 1 is provided. A pin seat 3 is fixedly installed below the mounting bracket 1. The middle part of the locking plate 2 is rotatably connected to the pin seat 3 via a pin. The locking plate 2 is vertically arranged, and the pin and the locking plate 2 are axially limited by a snap ring 4. One end of the locking plate 2 is bent downward to form a hook lock structure, which is used to conformally cooperate with the locking stop 17 at the top of the sliding door. The bent part of the locking plate 2 has a rounded chamfer structure.

[0018] A single-acting cylinder 8 is fixedly installed at one end of the mounting bracket 1 near the hook-lock structure. Its telescopic rod extends vertically and connects to a cylinder connector 6, which is a downwardly extending cylindrical body. The lower end of the cylinder connector 6 contacts the top surface of the hook-lock structure of the locking plate 2 via a bearing 7. The bearing 7 is vertically positioned and rotatably connected to the cylinder connector 6 via a pin 5. The outer ring of the bearing 7 can roll along the surface of the locking plate 2. The single-acting cylinder 8 drives the bearing 7 to push the locking plate 2 to rotate along the central pin. One end of the hook-lock structure of the bent structure of the locking plate 2 is pressed downwards, and the other end of the locking plate 2 is lifted upwards. Since the bearing 7 is the final force-transmitting structure of the single-acting cylinder 8, the sliding friction of the existing drive unit can be transformed into rolling friction between the outer ring of the bearing 7 and the locking plate 2, enhancing the smoothness of the door lock structure. A threaded bushing 11 is provided at the end of the mounting bracket 1 away from the hook-lock structure. A guide shaft 10 is vertically inserted into the threaded bushing 11 and slidably engaged with it. A nylon pressure head 12 is fixedly connected to the lower end of the guide shaft 10. The lower end face of the nylon pressure head 12 abuts against the upper side of the locking plate 2, and its upper side near the guide shaft 10 has a stepped structure. A spring 13 is sleeved on the outside of the guide shaft 10, with its two ends abutting between the lower end face of the threaded bushing 11 and the stepped structure of the nylon pressure head 12. When the end of the locking plate 2 away from the hook-lock structure is lifted, the guide shaft 10 retracts, and the spring 13 is compressed to generate elastic potential energy.

[0019] Preferably, the upper end of the mounting bracket 1 is provided with a bent sensor bracket 9, and the sensor 18 is vertically mounted on the sensor bracket 9. A detection gap is reserved between its sensing end and the threaded bushing 11 for the guide shaft 10 to move up and down. The left sliding door 15 and the right sliding door 16 form a separable locking engagement with the hook-lock structure of the locking plate 2 through the top locking block 17. When the single-acting cylinder 8 drives the locking plate 2 to rotate, the locking block 17 is captured by the hook-lock structure, and the spring 13 applies an elastic restoring force to the locking plate 2 through the nylon pressure head 12. The sensor 18 monitors the displacement state of the guide shaft 10 in real time to provide feedback on the locking position. When it is necessary to open the door or the equipment is stopped urgently, the solenoid valve of the single-acting cylinder 8 is de-energized, and the telescopic rod automatically retracts under the action of the internal restoring spring. At the same time, the spring 13 releases its elastic force and pushes the locking plate 2 to rotate in the opposite direction through the nylon pressure head 12, so that the hook-lock structure quickly disengages from the locking block 17, realizing the mechanical self-unlocking function under power failure conditions.

[0020] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and novel concept of this utility model, should be included within the protection scope of this utility model.

Claims

1. A mechanical automatic door lock structure for double doors, comprising a fixed door frame, characterized in that, Also includes: A mounting bracket and a pin seat are installed on a fixed door frame, with the pin seat located below the mounting bracket; A locking plate is rotatably connected to a pin seat in the middle. One end of the locking plate is bent downward to form a hook-lock structure, and the bent part is a rounded chamfer structure. A single-acting cylinder is mounted on the mounting bracket at one end near the hook lock structure. The single-acting cylinder telescopic rod is set vertically, and the cylinder connector is set vertically at the lower end of the telescopic rod. The bearing is set at the lower end of the cylinder connector through a pin, so that the cylinder connector cooperates with the rotating locking plate through the bearing. A threaded bushing is set on the mounting support at the end away from the hook lock structure. The guide shaft is vertically set inside the threaded bushing for movable fit. The pressure head is set at the lower end of the guide shaft. The lower end of the pressure head abuts against the upper side of the locking plate. The side of the pressure head near the guide shaft has a protruding stepped structure. A spring is sleeved on the guide shaft. One end of the spring abuts against the threaded bushing, and the other end abuts against the stepped mechanism of the pressure head. A single-acting cylinder drives the bearing to move downwards, and the bearing pushes the hook-lock structure of the locking plate to move in an arc.

2. The mechanical automatic door lock structure for double doors as described in claim 1, characterized in that, The upper end of the mounting bracket is also provided with a bent sensor bracket. The sensor is vertically mounted on the sensor bracket and is located above the threaded bushing. A gap is left between the sensor and the threaded bushing to allow the guide shaft to move upward. The sensor is used to detect the guide shaft.

3. The mechanical automatic door lock structure for double doors as described in claim 1, characterized in that, It also includes a sliding door, which slides in conjunction with a slide rail on a fixed door frame. A locking block is provided at the top of the sliding door, and the locking block conforms to the hook-lock structure of the locking plate.

4. The mechanical automatic door lock structure for double doors as described in claim 1, characterized in that, The pin seat and the locking plate are connected by a pin, and a snap ring is secured between the pin and the locking plate.

5. The mechanical automatic door lock structure for double doors as described in claim 1, characterized in that, The lower end face of the pressure head has a spherical structure.

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