Automatic identification and judgment method for the status of the clamping and locking pins of the finishing mill work rolls

Abstract

This invention relates to an automatic method for determining the state of the clamping locking pin of a finishing mill work roll, belonging to the technical field of metal rolling mill control methods. The method involves installing displacement sensors at both ends of the clamping cylinder and measuring the first displacement value hA (change in the extension / retraction distance of the clamping cylinder piston rod) and the second displacement value hB (change in the position of the sensor probe). Simultaneously, a fixed value h is set for the positional distance difference between the clamping locking pin in the locked and unlocked states. Therefore, during the process of the clamping cylinder opening and closing, gradually changing the clamping locking pin to the locked and unlocked states, the method reads the differences between several specific first displacement values, compares these differences with the fixed value h, and performs a determination to determine whether the clamping locking pin has reached either the locked or unlocked state. This allows for precise guidance on the timing of roll changing and roll shifting.

Description

Technical Field

[0001] This invention relates to a method for identifying and determining the state of the clamping locking pin located between the flat end of the work roll and the flat end sleeve of the drive shaft in a finishing mill, belonging to the technical field of metal rolling mill control methods. Background Technology

[0002] The main drive universal joint of the hot rolling mill is connected to the work roll via a flat-end sleeve. To prevent the flat-end sleeve from disengaging from the work roll's flat end during high-speed rotation, two horizontally symmetrically mounted clamping and locking pins are installed at the connection point. These pins are bolted into the body hole of the flat-end sleeve. The clamping and locking pins operate in two states: 1. During high-speed rotation, the clamping cylinders are open, and the two clamping and locking pins, under the action of their internal springs, tightly bind the flat-end sleeve and the flat end together; 2. During roll changing, under the action of the two clamping cylinders, the internal springs of the clamping and locking pins are compressed, losing their locking function, allowing the flat-end sleeve and the flat end to disengage, facilitating the removal and replacement of the work roll.

[0003] However, the two states of the clamping and locking pin mentioned above can only be identified and judged by manual on-site visual observation. If the observation is incorrect and the identification and judgment of the state of the clamping and locking pin is wrong, it will lead to the failure of the roll shifting function or the failure of roll pulling and roll changing. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to automatically identify and judge the state of the clamping and locking pins of the finishing mill work rolls.

[0005] The technical solution proposed by this invention to solve the above-mentioned technical problems is: an automatic identification and judgment method for the state of clamping and locking pins of a finishing mill work roll, wherein the work roll is provided with two clamping and locking pins, and the two clamping and locking pins are correspondingly equipped with two clamping cylinders, comprising the following steps:

[0006] 1) Two displacement sensors are respectively installed at both ends of each clamping cylinder. The first displacement sensor is located at one end of the clamping cylinder to measure the extension and retraction distance of the piston rod, and the second displacement sensor is located at the extended end of the piston rod of the clamping cylinder facing the clamping locking pin. The second displacement sensor has an elastic probe. The first displacement sensor measures and reads the first displacement value hA of the change in the extension and retraction distance of the piston rod, and the second displacement sensor measures and reads the second displacement value hB of the change in the position of its own probe.

[0007] 2) Set the distance difference h between the positions of the clamping locking pin when it is in the loose and locked states;

[0008] 3) When changing rollers

[0009] 3.1) When the two clamping cylinders start to close simultaneously, after the telescopic rod of the clamping cylinder contacts the clamping locking pin, the second displacement value hB gradually decreases and the first displacement value hA gradually increases. When the second displacement value hB=0, the first displacement value hA at this time is read and recorded as hA1; as the clamping cylinders continue to close until they stop, the first displacement value hA at this time is read and recorded as hA2.

[0010] 3.2) If the first displacement values ​​read by the two clamping cylinders are both found to satisfy hA2-hA1=h, it is determined that the clamping locking pin is in a loose state and the conditions for roller pulling are met.

[0011] If it is detected that either of the first displacement values ​​read by the two clamping cylinders satisfies hA2-hA1≠h, it is determined that the clamping locking pin has not yet been released and the conditions for roller pulling are not met.

[0012] 4) After changing the roller

[0013] 4.1) Open both clamping cylinders simultaneously. When the second displacement value hB starts to change, read the first displacement value hA at this time and record it as hA3.

[0014] 4.2) If the first displacement value read by the two clamping cylinders is found to satisfy hA2-hA3=h, it is determined that the clamping locking pin is in the locked state and the conditions for roller shifting are met; if the first displacement value read by the two clamping cylinders is found to satisfy hA2-hA3≠h, it is determined that the clamping locking pin is not yet locked and the conditions for roller shifting are not met.

[0015] Furthermore, in step 3.2), if the first displacement values ​​read by the two clamping cylinders both satisfy hA2-hA1=h±1mm, it is determined that the clamping locking pin is in a loose state and the conditions for roller pulling are met; if any of the first displacement values ​​read by the two clamping cylinders satisfies hA2-hA1≠h±1mm, it is determined that the clamping locking pin is not yet loose and the conditions for roller pulling are not met.

[0016] In step 4.2), if the first displacement values ​​read by the two clamping cylinders both satisfy hA2-hA3=h±1mm, it is determined that the clamping locking pin is in a locked state and the conditions for roller shifting are met; if any of the first displacement values ​​read by the two clamping cylinders satisfies hA2-hA3≠h±1mm, it is determined that the clamping locking pin is not yet locked and the conditions for roller shifting are not met.

[0017] The beneficial effects of this invention are as follows: By setting two displacement sensors at both ends of the clamping cylinder and measuring the first displacement value hA of the change in the extension and retraction distance of the clamping cylinder piston rod and the second displacement value hB of the change in the position of the probe of the second displacement sensor, and setting the position distance difference of the clamping locking pin in the two states of locking and unlocking as a fixed value h, it is possible to determine whether the clamping locking pin has reached the two states of locking and unlocking by reading the difference between several specific first displacement values ​​during the change and comparing and identifying the difference with the fixed value h. This allows for precise guidance on the timing of roller pulling, roller changing, and roller shifting. Attached Figure Description

[0018] The automatic identification and judgment method for the state of the clamping locking pin of the finishing mill work roll of the present invention will be further described below with reference to the accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the structure of the work rolls of the finishing mill in the embodiment.

[0020] Figure 2 From Figure 1 A schematic diagram of the clamping and locking pin structure extracted from the middle.

[0021] Figure 3 This is a schematic diagram showing the structure where the clamping and locking pin is in two combined states.

[0022] Figure 4 This is a schematic diagram of the structure when the clamping locking pin is in the locked state and its associated clamping cylinder is in the closed state.

[0023] Figure 5 This is a schematic diagram of the structure when the second displacement sensor just contacts the clamping locking pin after the clamping cylinder is opened.

[0024] Figure 6 This is a schematic diagram of the structure when the clamping cylinder continues to open until the clamping locking pin is in the released state.

[0025] Figure 7 yes Figure 6 A schematic diagram of the structure when the clamping locking pin is loosened and the roller is being pulled.

[0026] Figure 8 This is a schematic diagram of the clamping and locking pin structure when the clamping cylinder begins to close and the piston rod begins to retract. Detailed Implementation

[0027] Example

[0028] To illustrate the automatic identification and judgment method for the state of the clamping locking pin of the finishing mill work roll in this embodiment, the relevant structure of the existing finishing mill work roll clamping locking pin is described as follows:

[0029] like Figure 1 As shown, the work roll 100 of the finishing mill moves along the axial direction of the work roll 100 under the action of the roll shifting cylinder 120 to form a shifting roll; one end of the work roll 100, the flat end 7, is covered with a flat end sleeve 6, and the clamping locking pin 5 is installed in the body hole of the flat end sleeve 6 by bolts 107. Two symmetrical clamping locking pins 5 are provided on both sides of the work roll 100, and two clamping cylinders 8 are correspondingly matched to the two clamping locking pins 5. The two clamping cylinders 8 are horizontally symmetrically installed on both sides of the axial direction of the flat end sleeve 6 (i.e., the work roll 100).

[0030] like Figure 2 As shown, the clamping locking pin 5 mainly includes a housing 101, a guide ring 102, a slide 103, a ball bearing 104, a first spring 105, a second spring 106, a fixing bolt 107, a pressure cap 108, a bushing 109, and an oil nozzle 110. The clamping locking pin 5 has two main working states: locking and unlocking. Figure 3 As shown, Figure 3 The left half is in the locked state. Figure 3 The right half is in a loose state.

[0031] 1. Locked state

[0032] like Figure 3 In the left half, under the action of the first spring 105 and the second spring 106, the ball 104 is stuck between the slide 103, the bushing 109 and the cover 108, and the vertical height of the slide 103 and the bushing 109 is locked. Figure 2 The clamping locking pin 5 is in the locked state. At this time, the V-shaped head of the slide block 103 is pressed against the V-shaped groove corresponding to the flat head 7. The clamping locking pin 5, the flat head sleeve 6 and the flat head 7 are clamped together as one, which can make high-speed rotational motion and realize the roller shifting.

[0033] 2. Released state

[0034] like Figure 3 When a certain external force is applied to overcome the force of the first spring 105 and the second spring 106, the bushing 109 moves downward by h, and the ball 104 contacts the step of the slide block 103. The whole is in a state of virtual contact. At this time, only an upward external force needs to be applied, and the slide block 103 can move upward.

[0035] In both the locked and unlocked states, the distance difference between the positions of the clamping locking pin is a fixed value h.

[0036] For ease of description, the automatic identification and judgment method for the state of the clamping locking pin of the finishing mill work roll in this embodiment is illustrated only by taking the case of one clamping cylinder 8 and one clamping locking pin 5 on one side of the work roll 100 as an example. The clamping cylinder 8 and clamping locking pin 5 on the other side of the work roll 100 are exactly the same and are omitted. The method includes the following steps:

[0037] 1) such as Figure 4 As shown, two displacement sensors are respectively set at both ends of each clamping cylinder 8. The first displacement sensor 1 is located at one end (fixed end) of the clamping cylinder 8 to measure the extension distance of the piston rod 2. The second displacement sensor 3 is located at the extended end of the piston rod 2 of the clamping cylinder 8 and faces the clamping locking pin 5. The second displacement sensor 3 has an elastic probe 4.

[0038] The first displacement sensor 1 measures and reads the first displacement value hA of the change in the extension and retraction distance of the piston rod 2, and the second displacement sensor 3 measures and reads the second displacement value hB of the change in the position of its own probe 4. In this embodiment, as... Figure 4 As shown, when the clamping cylinder 8 is closed, the initial first displacement value hA=0, and the initial second displacement value hB is the length of the probe 4 in the free state. In this embodiment, the length of the probe 4 is set to 15mm.

[0039] 2) such as Figure 3 As shown, the distance difference h between the positions of the clamping locking pin 5 when it is in the loose and locked states is set; in this embodiment, h = 20 mm.

[0040] 3) When changing rollers

[0041] 3.1) The two clamping cylinders 8 simultaneously begin to close (the two clamping cylinders 8 extending their piston rods 2 relative to each other can be considered as closed). After the probe 4 on the piston rod of the clamping cylinder 8 contacts the clamping locking pin, the second displacement value hB gradually decreases, while the first displacement value hA gradually increases from 0. When the second displacement value hB = 0, that is, the length of the probe 4 is compressed to zero, the first displacement value hA of the first displacement sensor 1 at this time is read and recorded as hA1. Figure 5 As shown.

[0042] As the clamping cylinder 8 continues to close, the piston rod 2 continues to extend and pushes the clamping locking pin 5 in until it stops. The first displacement value hA of the first displacement sensor 1 at this point is recorded as hA2. Figure 6 As shown.

[0043] 3.2) If the first displacement values ​​read by the two clamping cylinders 8 respectively satisfy hA2-hA1=h=15mm, it is determined that the clamping locking pin 5 is in a loosened state, and the conditions for roller pulling are met; at this time, if Figure 7As shown, a slight horizontal force is applied to the clamping locking pin 5 to the left. The horizontal force of the interaction between the V-groove of the flat head 7 and the V-head of the slide block 103 is decomposed into a partial vertical force, which can lift the slide block 103 and allow the flat head 7 to be pulled out horizontally.

[0044] If it is detected that either of the first displacement values ​​read by the two clamping cylinders satisfies hA2-hA1≠h or either of the first displacement values ​​does not satisfy hA2-hA1=h=15mm, that is, generally hA2-hA1<h=15mm, it is determined that the clamping locking pin 5 has not been released and the conditions for roller pulling are not met.

[0045] 4) After changing the roller

[0046] 4.1) Simultaneously open both clamping cylinders 8 (the retraction of the piston rod 2 relative to each other in both clamping cylinders 8 can be considered as opening). When the position of the measuring probe 4 of the second displacement sensor 3 starts to change from 0, that is, when the second displacement value hB starts to change from 0, read the first displacement value hA measured by the first displacement sensor 1 at this time and record it as hA3. Figure 8 As shown, the subsequent process is exactly the same as the one described above. Figures 4 to 6 The process is the opposite.

[0047] 4.2) If the first displacement values ​​read by the two clamping cylinders are both found to satisfy hA2-hA3=h=15mm, the bushing 109 has been ejected and the clamping locking pin 5 is in a locked state, thus meeting the conditions for roller shifting. If any first displacement value read by the two clamping cylinders satisfies hA2-hA3≠h or any first displacement value does not satisfy hA2-hA1=h=15mm, i.e., generally hA2-hA3<h=15mm, the clamping locking pin 5 is not yet locked and the conditions for roller shifting are not met.

[0048] In this embodiment, the distance difference h between the positions of the clamping locking pin 5 in the loose and locked states can also be increased by a margin of about ±1mm. Therefore, the judgment formulas in steps 3.2) and 4.2) are respectively:

[0049] In step 3.2), hA2-hA1=h±1mm, hA2-hA1≠h±1mm, that is, generally hA2-hA1<h±1mm;

[0050] In step 4.2), hA2-hA3=h±1mm, hA2-hA3≠h±1mm, that is, generally hA2-hA3<h±1mm.

[0051] The above description is only a preferred embodiment of the present invention, but the present invention is not limited thereto. All equivalent substitutions or modifications made to the concepts and technical solutions of the present invention should be covered within the protection scope of the present invention.

Claims

1. A method for automatically identifying and judging the state of clamping locking pins on a finishing mill work roll, wherein the work roll is provided with two clamping locking pins, and the two clamping locking pins are correspondingly equipped with two clamping cylinders, characterized in that... Includes the following steps: 1) Two displacement sensors are installed at both ends of each clamping cylinder. The first displacement sensor is located at one end of the clamping cylinder to measure the extension and retraction distance of the piston rod, and the second displacement sensor is located at the extended end of the piston rod of the clamping cylinder facing the clamping locking pin. The second displacement sensor has an elastic probe. The first displacement sensor measures and reads the first displacement value hA of the change in the extension and retraction distance of the piston rod, and the second displacement sensor measures and reads the second displacement value hB of the change in the position of its own probe. 2) Set the distance difference h between the positions of the clamping locking pin when it is in the loose and locked states; 3) When changing rollers 3.1) When the two clamping cylinders start to close simultaneously, after the telescopic rod of the clamping cylinder contacts the clamping locking pin, the second displacement value hB gradually decreases and the first displacement value hA gradually increases. When the second displacement value hB=0, the first displacement value hA at this time is read and recorded as hA1; as the clamping cylinders continue to close until they stop, the first displacement value hA at this time is read and recorded as hA2. 3.2) If the first displacement values ​​read by the two clamping cylinders are both found to satisfy hA2-hA1=h, it is determined that the clamping locking pin is in a loose state and the conditions for roller pulling are met. If it is detected that either of the first displacement values ​​read by the two clamping cylinders satisfies hA2-hA1≠h, it is determined that the clamping locking pin has not yet been released and the conditions for roller pulling are not met. 4) After changing the roller 4.1) Open both clamping cylinders simultaneously. When the second displacement value hB starts to change, read the first displacement value hA at this time and record it as hA3. 4.2) If the first displacement value read by the two clamping cylinders is found to satisfy hA2-hA3=h, it is determined that the clamping locking pin is in the locked state and the conditions for roller shifting are met; if the first displacement value read by the two clamping cylinders is found to satisfy hA2-hA3≠h, it is determined that the clamping locking pin is not yet locked and the conditions for roller shifting are not met.

2. The method for automatically identifying and judging the state of the clamping and locking pins of the finishing mill work rolls according to claim 1, characterized in that: In step 3.2), if the first displacement values ​​read by the two clamping cylinders both satisfy hA2-hA1=h±1mm, it is determined that the clamping locking pin is in a loose state and the conditions for roller pulling are met; if any of the first displacement values ​​read by the two clamping cylinders satisfies hA2-hA1≠h±1mm, it is determined that the clamping locking pin is not yet loose and the conditions for roller pulling are not met. In step 4.2), if the first displacement values ​​read by the two clamping cylinders both satisfy hA2-hA3=h±1mm, it is determined that the clamping locking pin is in a locked state and the conditions for roller shifting are met; if any of the first displacement values ​​read by the two clamping cylinders satisfies hA2-hA3≠h±1mm, it is determined that the clamping locking pin is not yet locked and the conditions for roller shifting are not met.

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