Swing door lock device for continuous rolling mill
By improving the swing door lock device of the continuous rolling mill to a double-outlet hydraulic cylinder structure, combined with the lock tongue connecting rod and the connecting rod rear plate, the problem of easy damage of the traditional single-outlet hydraulic cylinder was solved, and the stable operation of the door lock device and production continuity were achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANXI TAIGANG STAINLESS STEEL CO LTD
- Filing Date
- 2025-06-19
- Publication Date
- 2026-06-23
Smart Images
Figure CN224396221U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of engineering machinery technology and relates to the locking of the swing door of a continuous rolling mill, specifically a door lock device for the swing door of a continuous rolling mill. Background Technology
[0002] In steel enterprises, cold continuous rolling RAP lines utilize multiple rolling mills to produce steel plates. During the rolling process, the mill swing door needs to be locked to ensure that the work rolls are fully positioned inside the mill, preventing unnecessary axial movement. To ensure the surface quality of stainless steel, the work rolls need to be frequently changed during continuous rolling, and the mill swing door needs to be opened and closed frequently. Traditional swing door locks use a single-lever cylinder for operation. Figure 1 As described above, the piston rod of the door lock cylinder is threadedly connected to the door lock tongue through a small connecting plate. Due to the small connection surface between the connecting plate and the single-outlet rod, and the need for the door lock tongue to move back and forth, the lock tongue bolt and lock tongue nut cannot be fully tightened and a certain gap needs to be left. Therefore, when the door lock tongue moves under the drive of the hydraulic cylinder, it often cannot guarantee a completely linear motion. As a result, the single-outlet rod of the hydraulic cylinder, which frequently makes linear movements, is very prone to fatigue and breakage, resulting in faults such as cylinder head breakage and cylinder head connecting thread pull-out. This leads to the scrapping of the door lock hydraulic cylinder, which in turn causes rolling mill failure and shutdown accidents, increases the consumption of rolling mill spare parts, and also seriously affects the normal cold continuous rolling production efficiency. Utility Model Content
[0003] The purpose of this invention is to provide a door lock device for the swing door of a continuous rolling mill, so as to avoid the continuous rolling line shutdown and maintenance caused by frequent damage to the door lock cylinder of the swing door, which would affect production.
[0004] The technical solution adopted by this utility model to achieve the above objectives is as follows:
[0005] A swing door lock device for a continuous rolling mill includes a lock tongue, a lock cylinder, a lock cylinder piston rod, a lock tongue connecting rod, and a connecting rod rear plate. The lock tongue is connected to a copper backing plate fixedly connected to the archway plane through a strip hole, a lock bolt, and a lock nut. The lock cylinder is a double-rod hydraulic cylinder that drives the lock cylinder piston rod to extend and retract. The lock cylinder is fixedly connected to the copper backing plate fixed to the archway plane through a lock cylinder base plate. One end of the lock tongue connecting rod is fixedly connected to the lock tongue, and the end of the lock tongue connecting rod away from the lock tongue is fixedly connected to the connecting rod rear plate. The lock tongue connecting rod and the lock cylinder piston rod are arranged parallel and coplanar. One end of the lock cylinder piston rod extends to push the lock tongue to lock the swing door, and the other end extends to push the connecting rod rear plate to open the swing door.
[0006] Furthermore, the door lock device also includes a connecting rod guide sleeve, which is fixed to the bottom plate of the door lock cylinder. The latch connecting rod is sleeved in the connecting rod guide sleeve and can slide within the latch connecting rod sleeve.
[0007] Furthermore, there are two sets of locking tongue connecting rod and connecting rod guide sleeve, which are respectively set on the upper and lower sides of the door lock cylinder piston rod.
[0008] Furthermore, the two ends of the piston rod of the door lock cylinder are slightly curved surfaces.
[0009] Furthermore, an adjusting screw is provided on the rear plate of the connecting rod at the position corresponding to the end face of the piston rod of the door lock cylinder for fine-tuning the contact surface between the end face of the piston rod of the door lock cylinder and the rear plate of the connecting rod.
[0010] The beneficial effects of this utility model are as follows: This utility model adopts a double-outlet hydraulic cylinder drive. The door lock tongue is formed by the combination of the lock tongue connecting rod and the connecting rod rear plate, which improves the stability of the lock tongue extension and retraction, reduces the frequency of door lock device damage, ensures the normal operation of the door lock device, and completely avoids the failures such as cylinder head breakage and cylinder head connection thread pull-out of traditional door locks, thus ensuring the normal operation of the entire continuous rolling line. At the same time, the end face of the door lock cylinder piston rod adopts a micro-curved surface design, which better adapts to the axial movement of the door lock tongue along the extension and retraction of the door lock cylinder piston rod, and the composite movement of the bolt axial movement due to the gap left by the door lock bolt and door lock nut not being fully tightened. In addition, an adjusting screw is installed on the connecting rod rear plate, which cooperates with the door lock cylinder piston rod to facilitate fine adjustment of the stroke position of the door lock tongue. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the traditional rolling mill swing door lock device.
[0012] Figure 2 This is a schematic diagram of the structure of this utility model;
[0013] Figure 3 This is a schematic diagram of the structure of the double-outlet rod door lock cylinder in this utility model;
[0014] In the diagram: 1. Door lock tongue; 2. Door lock cylinder; 3. Door lock cylinder piston rod; 3-1. End face; 4. Lock tongue connecting rod; 5. Connecting rod back plate; 6. Door lock bolt; 7. Door lock nut; 8. Copper backing plate; 9. Door lock base plate; 10. Connecting rod guide sleeve; 11. Connecting plate. Detailed Implementation
[0015] The preferred embodiments of the present invention will now be described with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.
[0016] like Figure 2As shown, a swing door lock device for a continuous rolling mill includes a lock tongue 1, a lock cylinder 2, a lock cylinder piston rod 3, a lock tongue connecting rod 4, and a connecting rod rear plate 5. The lock tongue 1 is connected to a copper backing plate 8 fixed on the archway plane through a slotted hole, a lock bolt 6, and a lock nut 7. The copper backing plate 8 facilitates the reciprocating sliding of the lock tongue 1. The lock cylinder 2 is a double-rod hydraulic cylinder that drives the lock cylinder piston rod 3 to extend and retract. The lock cylinder 2 is connected to the lock cylinder base plate. 9. The copper backing plate 8 is fixedly connected to the plane of the archway. One end of the lock tongue connecting rod 4 is fixedly connected to the door lock tongue 1. The end of the lock tongue connecting rod 4 away from the door lock tongue 1 is fixedly connected to the connecting rod rear plate 5. The lock tongue connecting rod 4 and the door lock cylinder piston rod 3 are set parallel and coplanar. One end of the door lock cylinder piston rod 3 extends out to push the door lock tongue 1 to lock the swing door. The end of the door lock cylinder piston rod 3 away from the door lock tongue 1 extends out to push the connecting rod rear plate 5 to drive the door lock tongue 1 to open the swing door through the lock tongue connecting rod 4.
[0017] The door lock tongue 1, the lock tongue connecting rod 4, and the connecting rod back plate 5 form a frame structure, which is fixed to the archway plane 8 by the door lock bolts 6. The door lock cylinder 2 has been improved from a single rod to a double rod. One side of the door lock cylinder piston rod 3 extends to push the door lock tongue 1 to close the swing door lock, and the other side of the door lock cylinder piston rod 3 extends to push the connecting rod back plate 5 to drive the door lock tongue 1 to open the door lock through the lock tongue connecting rod 4. Here, the double rod door lock cylinder 2 is combined with the frame structure door lock tongue 1. After the improvement, the door lock cylinder piston rod 3 and the door lock tongue 1 only contact each other without connecting, replacing the previous rigid threaded connection structure. The previous push and pull mode has been adjusted to a push and push mode, which fundamentally eliminates the occurrence of faults such as door lock cylinder rod head breakage and rod head connection thread pull-out.
[0018] In order to constrain the non-linear movement of the door lock tongue, the door lock device also includes a connecting rod guide sleeve 10. The connecting rod guide sleeve 10 is fixed on the bottom plate 9 of the door lock cylinder. The lock tongue connecting rod 4 is sleeved in the connecting rod guide sleeve 10 and can slide back and forth in the lock tongue connecting rod sleeve 10.
[0019] There are two sets of locking tongue connecting rod 4 and connecting rod guide sleeve 10, which are respectively set on the upper and lower sides of the door lock cylinder piston rod 3.
[0020] To better accommodate the combined movement of the door lock tongue, the end faces of both ends of the door lock cylinder piston rod 3 are slightly curved surfaces.
[0021] An adjusting screw is provided on the rear plate 5 of the connecting rod at the position corresponding to the end face of the piston rod 3 of the door lock cylinder. The adjusting screw is threadedly connected to the rear plate 5 of the connecting rod and is used to finely adjust the contact surface position between the end face of the piston rod 3 of the door lock cylinder and the rear plate 5 of the connecting rod, thereby facilitating fine adjustment of the stroke position of the door lock tongue.
[0022] The company adopted the above solution to modify 10 rolling mill swing doors and door lock devices on 5 continuous rolling mills. Before the modification, the door lock cylinder was damaged on average once a month. Each repair required the entire continuous rolling line to be shut down for replacement, which brought great production risks and also caused great economic losses. After the modification, no similar failures have occurred. It can be said that the shutdown accidents caused by door lock cylinder damage have been fundamentally solved.
[0023] Based on an average hourly output of 50 tons for the continuous rolling mill, a profit of 200 yuan per ton, a one-hour downtime for troubleshooting, and a door lock cylinder costing 900 yuan each: Annual increased production and efficiency: 50 × 200 × 12 × 1 = 120,000 yuan; Annual savings on door lock cylinders: 900 × 12 = 10,800 yuan; Total economic benefit: 120,000 + 10,800 = 130,800 yuan = 130,800 yuan.
[0024] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.
Claims
1. A door lock device for a swing door of a continuous rolling mill, characterized in that: The system includes a door lock tongue, a door lock cylinder, a door lock cylinder piston rod, a lock tongue connecting rod, and a connecting rod rear plate. The door lock tongue is connected to a copper backing plate fixed to the archway plane via a strip hole, bolts, and nuts. The door lock cylinder is a double-outlet hydraulic cylinder that drives the door lock cylinder piston rod to extend and retract. The door lock cylinder is fixed to the copper backing plate via a door lock cylinder base plate. One end of the lock tongue connecting rod is fixedly connected to the door lock tongue, and the end of the lock tongue connecting rod away from the door lock tongue is fixedly connected to the connecting rod rear plate. The lock tongue connecting rod and the door lock cylinder piston rod are parallel and coplanar. The end of the door lock cylinder piston rod near the door lock tongue can push the door lock tongue to lock the swing door, and the end of the door lock cylinder piston rod away from the door lock tongue can push the connecting rod rear plate to open the swing door.
2. The swing door lock device for a continuous rolling mill according to claim 1, characterized in that: The door lock device also includes a connecting rod guide sleeve, which is fixed to the bottom plate of the door lock cylinder. The latch connecting rod is sleeved in the connecting rod guide sleeve and can slide in the latch connecting rod sleeve.
3. The swing door lock device for a continuous rolling mill according to claim 2, characterized in that: The latch connecting rod and the connecting rod guide sleeve are two sets, respectively located on the upper and lower sides of the door lock cylinder piston rod.
4. The swing door lock device for a continuous rolling mill according to claim 1, characterized in that: The piston rod of the door lock cylinder has two slightly curved surfaces at both ends.
5. A swing door lock device for a continuous rolling mill according to claim 1, characterized in that: An adjusting screw is provided on the rear plate of the connecting rod at the position corresponding to the end face of the piston rod of the door lock cylinder for fine-tuning the contact surface between the end face of the piston rod of the door lock cylinder and the rear plate of the connecting rod.