Guide and guard limiting device of four-roller reversible roughing mill
By designing a limit device on the guide device of the four-roll reversible roughing mill, and utilizing support plates, connectors, and a cable alarm system, the production accident caused by the guide falling was solved, and stable equipment operation and improved production efficiency were achieved.
Patent Information
- Application Number
- CN202423055921.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-11
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2034-12-11
AI Technical Summary
The existing four-roll reversible roughing mill guide device is prone to descent when hydraulic pressure fluctuates or power is lost, leading to frequent production accidents, serious equipment damage, and insufficient maintenance that cannot meet the needs of new product development.
Design a guide limit device for a four-roll reversible roughing mill, including two guide limit mechanisms. Each mechanism consists of a support plate and a connector. The connector includes a fixing plate and a connecting rod, which are fixed by anchor chains and lock nuts. A limit block and a cable alarm system are added to ensure the stability of the guide and timely alarm.
It effectively prevents guide vane descent accidents, reduces equipment failure rate, improves production efficiency, reduces production costs, and enables timely alarm and emergency response.
Smart Images
Figure CN223642485U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of steel rolling technology, and in particular to a guide and limiting device for a four-roll reversible roughing mill. Background Technology
[0002] The roughing mill inlet and outlet guide devices are mainly operated by two hydraulic cylinders and are always in an elevated state during production. Since its construction, the 1800mm hot roll roughing mill has undergone virtually no major maintenance. Although it was able to meet production requirements in the early stages, with the aging of the equipment system and the continuous development of various new products, the failure rate of the roughing mill inlet and outlet guide devices has gradually increased. During the rolling process, there have been multiple incidents of instantaneous hydraulic pressure fluctuations or power outages of the guides, causing the guides to drop in position. This has resulted in production accidents where the strip collided with the guides on the mill, causing them to fold inside the mill or even be ejected from the mill. Each incident takes 12 to 24 hours to resolve, which not only restricts production but also causes significant damage to the equipment.
[0003] Therefore, there is an urgent need for a guide limit device for a four-roll reversible roughing mill that can effectively limit the descent of the guide when there is a momentary fluctuation in hydraulic pressure or a power failure, thereby reducing the occurrence of production accidents and ensuring normal production operation. Utility Model Content
[0004] This invention addresses the shortcomings of existing technologies by providing a guide and limiting device for a four-roll reversible roughing mill.
[0005] This utility model is achieved through the following technical solution: a guide limiting device for a four-roll reversible roughing mill is provided, comprising two guide limiting mechanisms located on the outside of two guide cylinders respectively; each guide limiting mechanism includes a support plate fixed to the guide frame and a connecting member connected to the guide, the connecting member including a fixing plate fixed to the guide and a connecting rod penetrating the fixing plate, the upper end of the connecting rod being fixed to the connecting plate and the lower end being threaded to a locking nut, and an anchor chain being connected between the support plate and the connecting plate.
[0006] Preferably, in order to improve the stability of the guide limit and avoid the guide limit failure due to the failure of the connection between the locking nut and the connecting rod, a limit block is also fixed on the connecting rod at the lower end of the locking nut. After the locking nut fails, the limit block can limit the fixed plate again, achieving a double insurance effect.
[0007] Preferably, the connecting rod is a screw.
[0008] Preferably, the fixing plate is a U-shaped plate with one end open. The U-shaped plate includes a fixing part fixed to the guide and two limiting parts fixed to the fixing part. The connecting rod extends through the opening of the U-shaped plate to the space between the two limiting parts.
[0009] Preferably, a limiting bolt for limiting the connecting rod is installed at the opening of the U-shaped plate. The limiting bolt passes through the two limiting parts and is connected to the limiting nut. The fixing plate is a U-shaped plate, which makes it easy to remove and replace the connecting rod.
[0010] Preferably, there are two anchor chains. An upper connecting hole is provided on the support plate, and a lower connecting hole is provided on the connecting plate. The upper end of the anchor chain is connected to the upper connecting hole, and the lower end of the anchor chain is connected to the lower connecting hole. This facilitates anchor chain replacement, and the two anchor chains further improve the stability of the guide's positioning.
[0011] Preferably, a cable is bolted between the fixed plate and the support plate, and the cable is connected to the relay coil. The normally closed contact of the relay is connected in series in the alarm circuit. Controlled by the normally closed contact of the relay, if the guide falls and the anchor chain breaks, pulling the cable apart, the relay is de-energized, the normally closed contact becomes conductive, and the alarm light is energized to sound an alarm, thus reminding the operator to take emergency measures.
[0012] The beneficial effects of this utility model are as follows:
[0013] This invention eliminates production accidents caused by guide falls due to instantaneous hydraulic pressure fluctuations or power outages, reducing equipment failure rates, increasing production efficiency, and effectively controlling production costs. The added alarm function can promptly detect abnormal guide conditions and prevent accidents from escalating. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of this utility model;
[0015] Figure 2 This is a top view of the connector of this utility model.
[0016] As shown in the figure:
[0017] 1. Guide cylinder, 2. Guide frame, 3. Support plate, 4. Fixing plate, 5. Connecting rod, 6. Connecting plate, 7. Locking nut, 8. Anchor chain, 9. Limiting block, 10. Cable, 41. Fixing part, 42. Limiting part, 43. Limiting bolt, 44. Limiting nut. Detailed Implementation
[0018] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.
[0019] like Figure 1-2As shown, this utility model includes two guide limiting mechanisms, which are located on the outer sides of two guide cylinders 1. Each guide limiting mechanism includes a support plate 3 fixed to the guide frame 2 and a connecting member connected to the guide. The connecting member includes a fixing plate 4 fixed to the guide and a connecting rod 5 penetrating the fixing plate 4. The upper end of the connecting rod 5 is fixed to the connecting plate 6, and the lower end is threadedly connected to a locking nut 7. An anchor chain 8 is connected between the support plate 3 and the connecting plate 6. The outer cylinder of the guide cylinder 1 is mounted on the guide frame 2. The piston rod of the guide cylinder 1 is connected to the guide. The anchor chain 8 pulls the fixing plate 4 to limit the guide, preventing production accidents caused by the guide falling due to instantaneous hydraulic pressure fluctuations or power failures.
[0020] In this embodiment, the connecting rod 5 is a screw. To improve the stability of the guide's limiting position and prevent the guide's limiting position from failing due to the failure of the connection between the locking nut 7 and the connecting rod 5, a limiting block 9 is also fixed on the connecting rod 5 at the lower end of the locking nut 7. After the locking nut 7 fails, the limiting block 9 can limit the fixing plate 4 again, achieving a double insurance effect. In this embodiment, the fixing plate 4 is a U-shaped plate with one end open. The U-shaped plate includes a fixing part 41 fixed to the guide and two limiting parts 42 fixed to the fixing part 41. The connecting rod 5 extends through the opening of the U-shaped plate to the space between the two limiting parts 42. A limiting bolt 43 for limiting the connecting rod 5 is installed at the opening of the U-shaped plate. The limiting bolt 43 passes through the two limiting parts 42 and is connected to the limiting nut 44. The U-shaped fixing plate 4 allows for easy removal and replacement of the connecting rod 5.
[0021] In this embodiment, there are two anchor chains 8. An upper connecting hole is provided on the support plate 3, and a lower connecting hole is provided on the connecting plate 6. The upper end of the anchor chain 8 is connected to the upper connecting hole, and the lower end of the anchor chain 8 is connected to the lower connecting hole, facilitating the replacement of the anchor chains 8. The two anchor chains 8 further improve the stability of the guide's positioning.
[0022] In this embodiment, to further increase the safety factor, a cable 10 is bolted between the fixed plate 4 and the support plate 3. The cable 10 is connected to the relay coil, and the normally closed contact of the relay is connected in series in the alarm circuit. The normally closed contact of the relay controls the alarm. Once the guide falls and the anchor chain 8 breaks, the cable 10 will be pulled off, the relay will lose power, the normally closed contact will become conductive, and the alarm light will be energized to sound an alarm, thereby reminding the operator to take emergency measures.
[0023] In actual operation, after the working roller guide is lifted into position, the anchor chain 8 is connected between the support plate 3 and the connecting plate 6. Then, the connecting rod 5 is extended from the opening of the fixed plate 4 into the fixed plate 4, so that the connecting plate 6 is above the fixed plate 4 and the locking nut 7 is below the fixed plate 4. The locking nut 7 is rotated to tighten and lock. Then, the limit bolt 43 is installed and the cable 10 is bolted. When the cylinder pressure fluctuates or the power is lost, the guide is lifted by the anchor chain 8, thereby preventing the guide from falling and causing an accident.
[0024] This invention eliminates production accidents caused by guide falls due to instantaneous hydraulic pressure fluctuations or power outages, reducing equipment failure rates, increasing production efficiency, and effectively controlling production costs. The added alarm function can promptly detect abnormal guide conditions and prevent accidents from escalating.
[0025] Of course, the above description is not limited to the examples above. Technical features of this utility model not described can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model.
Claims
1. A guide and limiting device for a four-roll reversible roughing mill, characterized in that: It includes two guide limiting mechanisms, which are located on the outside of two guide cylinders respectively. Each guide limiting mechanism includes a support plate fixed to the guide frame and a connecting member connected to the guide. The connecting member includes a fixing plate fixed to the guide and a connecting rod penetrating the fixing plate. The upper end of the connecting rod is fixed to the connecting plate, and the lower end is threaded to a locking nut. An anchor chain is connected between the support plate and the connecting plate.
2. The guide limiting device for a four-roll reversible roughing mill according to claim 1, characterized in that: A limit block is also fixed on the connecting rod at the lower end of the lock nut.
3. The guide limiting device for a four-roll reversible roughing mill according to claim 1, characterized in that: The connecting rod is a screw.
4. The guide limiting device for a four-roll reversible roughing mill according to claim 1, characterized in that: The fixing plate is a U-shaped plate with one end open. The U-shaped plate includes a fixing part fixed to the guide and two limiting parts fixed to the fixing part. The connecting rod extends through the opening of the U-shaped plate to the space between the two limiting parts.
5. The guide and limiting device for a four-roll reversible roughing mill according to claim 4, characterized in that: A limiting bolt for limiting the connecting rod is installed at the opening of the U-shaped plate. The limiting bolt passes through the two limiting parts and is connected to the limiting nut. The fixing plate is a U-shaped plate, which makes it easy to remove and replace the connecting rod.
6. The guide limiting device for a four-roll reversible roughing mill according to claim 1, characterized in that: The anchor chain consists of two chains. An upper connecting hole is provided on the support plate, and a lower connecting hole is provided on the connecting plate. The upper end of the anchor chain is connected to the upper connecting hole, and the lower end of the anchor chain is connected to the lower connecting hole.
7. The guide limiting device for a four-roll reversible roughing mill according to claim 1, characterized in that: A cable is bolted between the fixed plate and the support plate. The cable is connected to the relay coil, and the normally closed contact of the relay is connected in series with the alarm circuit.