Jacking device

Abstract

The utility model discloses a jacking device, and belongs to the technical field of steel rolling machinery, and the jacking device is characterized by comprising a guide cylinder, a telescopic piece and a jacking block, a through hole is formed in a rack of a rolling mill, the through hole is located below a transmission shaft, and the guide cylinder is connected with the side, away from the transmission shaft, of the rack; the inner diameter of the guide cylinder is not larger than the diameter of the through hole, the telescopic piece is connected with the guide cylinder, a driving shaft of the telescopic piece stretches into the guide cylinder and is connected with the ejector block, and when the two intermediate rollers are replaced, the ejector block abuts against the transmission shaft, so that the effect that the two intermediate rollers are convenient to replace is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of steel rolling machinery, and in particular to a jacking device. Background Art

[0002] During operation, the Sendzimir 20-high mill rotates the two intermediate rolls via a drive and transmission shaft to process the strip. Transmission is achieved via a matching plum-tooth connection between the drive shaft and the two intermediate rolls. The drive shaft connects to the plum-tooth sleeve, and the two intermediate rolls connect to the plum-tooth shaft. Due to extended operation or maintenance requirements, the two intermediate rolls require regular inspection and replacement.

[0003] In the prior art, replacing the intermediate rollers requires detaching them from the drive shaft. However, gravity can cause slight deformation at the end of the drive shaft closest to the intermediate rollers. Because the drive shaft and intermediate rollers utilize a plum blossom tooth connection, this deformation can cause mismatches between the plum blossom tooth sleeves when the new intermediate rollers are installed, leading to jamming and increasing the difficulty of replacement. Utility Model Content

[0004] In order to facilitate the replacement of the two intermediate rollers, the utility model provides a jacking device.

[0005] The utility model provides a lifting device that adopts the following technical solutions:

[0006] A lifting device includes a guide cylinder, a telescopic member and a top block. A through hole is provided on the frame of the rolling mill, and the through hole is located below the transmission shaft. The guide cylinder is connected to the side of the frame away from the transmission shaft. The inner diameter of the guide cylinder is not larger than the diameter of the through hole. The telescopic member is connected to the guide cylinder, and the drive shaft of the telescopic member extends into the guide cylinder and is connected to the top block. When replacing two intermediate rollers, the top block abuts against the transmission shaft.

[0007] By employing this technical solution, the telescopic member is controlled to move the ejector block toward the drive shaft until it abuts the shaft. At this point, the ejector block exerts an upward force on the shaft, offsetting the downward deformation caused by gravity. This allows the shaft to maintain its original shape and position when the second intermediate roller is replaced, minimizing mismatch and jamming in the plum blossom gear connection. The guide cylinder provides guidance, facilitating the ejector block's passage through the through hole.

[0008] Preferably, a slot and a threaded groove are provided on the top block, the threaded groove is connected to the slot, the driving shaft of the telescopic part is inserted into the slot, the driving shaft of the telescopic part is connected with a fixing bolt, the fixing bolt extends into the threaded groove and is threadedly connected to the top block, so as to realize the fixation of the telescopic part and the top block.

[0009] By adopting this technical solution, when installing the jack block, the telescopic member's drive shaft is inserted into the slot in the jack block. Then, by rotating the jack block, the fixing bolt extends into the threaded groove and becomes tightly threaded with the jack block. This design enhances the stability of the connection between the jack block and the telescopic member, reducing the possibility of the jack block falling off or shifting during the jacking process, thereby improving the safety and reliability of the entire jacking device.

[0010] Preferably, the diameter of the top block is kept consistent from one end close to the telescopic member to the other end, and the diameter of the top block matches the inner diameter of the guide cylinder.

[0011] By adopting the above technical solution, the top block can provide uniform support force when abutting the drive shaft, reducing the possibility of deformation or damage to the drive shaft caused by excessive pressure in a local area. To reduce the collision between the top block and the guide cylinder, the diameter of the top block matches the inner diameter of the guide cylinder.

[0012] Preferably, the diameter of the top block gradually decreases from one end away from the telescopic member to the other end, and the maximum diameter of the top block matches the inner diameter of the guide cylinder.

[0013] By adopting the above technical solution, steel slag will be generated due to the damage and fall of the bearings or the broken belt in the rolling mill arch. These steel slags will flow to the position of the two intermediate top blocks with the rolling oil. When the top blocks reset after lifting the drive shaft, the steel slag will enter the gap between the top blocks and the guide cylinder. Since the diameters of the two ends of the top blocks are the same, the top blocks are prone to being stuck by the steel slag when they descend, which may cause the top blocks to always rub against the drive shaft, thereby causing the top blocks to bend or cause a fire. However, it is difficult to replace these two intermediate top blocks after they are damaged. They need to be removed from the bottom plate of the drive shaft box and replaced offline. Therefore, the diameter of the top blocks is gradually reduced while ensuring that the contact area between the top blocks and the drive shaft remains unchanged. As the diameter of the top blocks becomes smaller, the steel slag will not get stuck to the top blocks, but will fall directly along the gap between the top blocks and the guide cylinder, effectively reducing the problem of the top blocks being stuck due to steel slag during the process of returning to the guide cylinder.

[0014] Preferably, the top of the top block is chamfered.

[0015] By adopting the above technical solution, the chamfer design can reduce the stress concentration between the top block and the transmission shaft during the jacking process, thereby extending the service life of the device.

[0016] Preferably, a bottom block is provided at one end of the top block close to the telescopic member, the bottom block and the top block are integrally formed, the bottom block is sleeved on the driving shaft of the telescopic member, and the diameter of the bottom block is larger than the diameter of the top block close to the end of the bottom plate.

[0017] By adopting the above technical solution, the bottom block is arranged below the top block, and the steel slag that falls directly from the gap between the top block and the guide cylinder will fall onto the bottom block, and then when the telescopic part drives the top block to abut against the transmission shaft, it is convenient to clean the steel slag on the bottom plate.

[0018] Preferably, the outer diameter of the bottom block matches the inner diameter of the guide cylinder.

[0019] By adopting this technical solution, the bottom block can slide smoothly within the guide tube, reducing friction and energy loss. At the same time, the matching diameter also helps to prevent the bottom block from getting stuck or deflecting during the sliding process, thereby ensuring the accuracy and stability of the lifting device.

[0020] Preferably, the bottom of the bottom block is chamfered.

[0021] By adopting the above technical solution, the stress concentration phenomenon generated during the sliding process can be reduced, thereby extending the service life of the guide cylinder and the bottom block.

[0022] In summary, the present invention has the following beneficial effects:

[0023] By controlling the telescopic member, the ejector block moves toward the drive shaft until it contacts the shaft. At this point, the ejector block exerts an upward force on the shaft, offsetting the downward deformation caused by gravity. This allows the shaft to maintain its original shape and position when the second intermediate roller is replaced, minimizing mismatch and jamming in the plum blossom gear connection. The guide cylinder provides guidance, facilitating the ejector block's passage through the through hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of a jacking device in Example 1.

[0025] Figure 2 yes Figure 1 Enlarged schematic diagram of part A.

[0026] Figure 3 It is a partial schematic diagram of the top block of Example 1.

[0027] Figure 4 This is a schematic diagram of the overall structure of a jacking device in Example 2.

[0028] Figure 5 yes Figure 4 Enlarged schematic diagram of part A.

[0029] Figure 6 This is a diagram of the state where the top block abuts the transmission shaft in Example 2.

[0030] Figure 7 It is a partial schematic diagram of the top block in Example 2.

[0031] Description of reference numerals:

[0032] 1. Frame; 11. Through hole; 2. Drive shaft; 3. Second intermediate roller; 4. Guide cylinder; 5. Hydraulic cylinder; 6. Top block; 61. Slot; 62. Threaded groove; 7. Fixing bolt; 8. Bottom block. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments.

[0034] In the description of the embodiments of this application, words such as "for example" or "for instance" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "for example" or "for instance" in the embodiments of this application should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "for example" or "for instance" is intended to present the relevant concepts in a concrete manner.

[0035] In the description of the embodiments of the present application, the term "multiple" means two or more. For example, multiple systems refer to two or more systems, and multiple screen terminals refer to two or more screen terminals. In addition, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized.

[0036] A lifting device, referring to Figure 1 and Figure 2 , including a guide cylinder 4, a telescopic member and a top block 6. A through hole 11 is opened on the frame 1 of the rolling mill. The through hole 11 is located below the transmission shaft 2. The guide cylinder 4 is fixedly connected to the side of the frame 1 away from the transmission shaft 2. The inner diameter of the guide cylinder 4 is not larger than the diameter of the through hole 11. The telescopic member is connected to the guide cylinder 4. The drive shaft of the telescopic member extends into the guide cylinder 4 and is connected to the top block 6. When the second intermediate roller 3 is replaced, the top block 6 abuts against the transmission shaft 2.

[0037] By controlling the telescopic member, the top block 6 moves toward the drive shaft 2 until it abuts against it. At this point, the top block 6 exerts an upward supporting force on the drive shaft 2, offsetting the downward deformation of the drive shaft 2 due to gravity. This allows the drive shaft 2 to maintain its original shape and position when the second intermediate roller 3 is replaced, minimizing mismatch and jamming in the plum blossom gear connection. The guide cylinder 4 provides guidance, facilitating the passage of the top block 6 through the through hole 11.

[0038] Reference Figure 1 In order to achieve the same purpose, the telescopic member can adopt a cylinder, a hydraulic cylinder 5, etc. In this embodiment, the hydraulic cylinder 5 is selected.

[0039] Reference Figure 1 and Figure 2 The through hole 11 is located below the transmission shaft 2 near one end of the second intermediate roller 3. When the hydraulic cylinder 5 lifts the top block 6 and supports the transmission shaft 2, it is more labor-saving and has a better supporting effect.

[0040] Reference Figure 2 The guide cylinder 4 is vertically arranged and is a cylindrical cylinder. The inner diameter of the guide cylinder 4 is the same as the diameter of the through hole 11. The hydraulic cylinder 5 is fixedly connected to the bottom end of the guide cylinder 4.

[0041] Reference Figure 2 and Figure 3 , the top block 6 is cylindrical, and its diameter matches the inner diameter of the guide cylinder 4. Both ends of the top block 6 are chamfered.

[0042] To reduce collisions between the top block 6 and the guide cylinder 4, the diameter of the top block 6 matches the inner diameter of the guide cylinder 4. The chamfered corners allow the top block 6 to provide uniform support when contacting the drive shaft 2, reducing the possibility of deformation or damage to the drive shaft 2 due to excessive pressure in a local area.

[0043] Reference Figure 3 The bottom end of top block 6 is provided with a slot 61 and a threaded groove 62. Threaded groove 62 communicates with slot 61 and is located at the end of slot 61 away from hydraulic cylinder 5. Slot 61 mates with the drive shaft of hydraulic cylinder 5, which is inserted into slot 61. A fixing bolt 7 is fixedly connected to hydraulic cylinder 5. Fixing bolt 7 extends into threaded groove 62 and is threadedly connected to top block 6, securing hydraulic cylinder 5 to top block 6.

[0044] This design enhances the connection stability between the top block 6 and the telescopic member, reduces the possibility of the top block 6 falling off or shifting during the jacking process, and thus improves the safety and reliability of the entire jacking device.

[0045] The operating principle of this application is as follows: By controlling the telescopic member, the top block 6 is moved toward the drive shaft 2 until it abuts the drive shaft 2. At this point, the top block 6 exerts an upward supporting force on the drive shaft 2 to offset the downward deformation of the drive shaft 2 caused by gravity. This allows the drive shaft 2 to maintain its original shape and position when the second intermediate roller 3 is replaced, thereby reducing the possibility of mismatch and jamming in the plum blossom tooth connection structure. The guide cylinder 4 provides a guiding function, facilitating the passage of the top block 6 through the through hole 11.

[0046] Example 2

[0047] A lifting device, referring to Figure 4 and Figure 5 The difference from Example 1 is that the top block 6 is in the shape of an inverted truncated cone, the bottom diameter is smaller than the top diameter, and the maximum diameter of the top block 6 matches the inner diameter of the guide cylinder 4.

[0048] Since the bearings in the rolling mill are damaged, fall off, or break, steel slag is generated. This steel slag flows with the rolling oil to the position of the two middle top blocks 6. When the top block 6 is reset after lifting the transmission shaft 2, the steel slag will enter the gap between the top block 6 and the guide cylinder 4. Since the diameters of the two ends of the top block 6 are the same, the top block 6 is prone to being stuck by the steel slag when it descends, which may cause the top block 6 to rub against the transmission shaft 2 all the time, thereby causing the top block 6 to bend or cause a fire. However, it is difficult to replace these two middle top blocks 6 after they are damaged. The bottom plate of the transmission shaft 2 box must be disassembled and replaced offline. Therefore, while ensuring that the contact area between the top block 6 and the transmission shaft 2 remains unchanged, the diameter of the top block 6 is gradually reduced. As the diameter of the top block 6 decreases, the steel slag will not get stuck in the top block 6, but will fall directly through the gap between the top block 6 and the guide cylinder 4, effectively reducing the problem of the top block 6 being stuck due to steel slag when returning to the guide cylinder 4.

[0049] Reference Figure 5 and Figure 6 The top block 6 is provided with a bottom block 8 at one end near the hydraulic cylinder 5. The bottom block 8 is sleeved on the drive shaft of the hydraulic cylinder 5 and is integrally formed with the top block 6. The diameter of the bottom block 8 is larger than the bottom diameter of the top block 6 and is the same as the diameter of the guide cylinder 4. The bottom block 8 is in sliding contact with the guide cylinder 4.

[0050] No matter whether the top block 6 is in contact with the transmission shaft 2 or not, the bottom block 8 will never separate from the guide cylinder 4 .

[0051] Steel slag that falls directly from the gap between the top block 6 and the guide cylinder 4 will fall onto the bottom block 8, making it easier to clean the steel slag from the bottom plate when the telescopic member drives the top block 6 into contact with the transmission shaft 2. At the same time, the matching diameters also help reduce the possibility of the bottom block 8 getting stuck or deflecting during the sliding process, thereby ensuring the accuracy and stability of the jacking device.

[0052] Reference Figure 7The top of the top block 6 is chamfered, and the bottom of the bottom block 8 is chamfered.

[0053] The chamfered setting of the bottom block 8 can reduce the stress concentration phenomenon generated during the sliding process, thereby extending the service life of the guide cylinder 4 and the bottom block 8.

[0054] The embodiments of this specific implementation method are all preferred embodiments of the present utility model, and are not intended to limit the scope of protection of the present utility model. Therefore, any equivalent changes made based on the structure, shape, and principle of the present utility model should be included in the scope of protection of the present utility model.

Claims

1. A lifting device, characterized in that: The invention comprises a guide cylinder (4), a telescopic member and a top block (6); a through hole (11) is provided on the frame (1) of the rolling mill; the through hole (11) is located below the transmission shaft (2); the guide cylinder (4) is connected to the side of the frame (1) away from the transmission shaft (2); the inner diameter of the guide cylinder (4) is not greater than the diameter of the through hole (11); the telescopic member is connected to the guide cylinder (4); the drive shaft of the telescopic member extends into the guide cylinder (4) and is connected to the top block (6); when the second intermediate roller (3) is replaced, the top block (6) abuts against the transmission shaft (2).

2. A lifting device according to claim 1, characterized in that: The top block (6) is provided with a slot (61) and a threaded groove (62), the threaded groove (62) is communicated with the slot (61), the drive shaft of the telescopic member is inserted into the slot (61), the drive shaft of the telescopic member is connected with a fixing bolt (7), the fixing bolt (7) extends into the threaded groove (62) and is threadedly connected to the top block (6), so as to achieve the fixation of the telescopic member and the top block (6).

3. A lifting device according to claim 1 or 2, characterized in that: The diameter of the top block (6) remains consistent from one end close to the telescopic member to the other end, and the diameter of the top block (6) matches the inner diameter of the guide cylinder (4).

4. A lifting device according to claim 1 or 2, characterized in that: The diameter of the top block (6) gradually decreases from one end away from the telescopic member to the other end, and the maximum diameter of the top block (6) matches the inner diameter of the guide cylinder (4).

5. The lifting device according to claim 1, characterized in that: The top of the top block (6) is chamfered.

6. A lifting device according to claim 1, characterized in that: The top block (6) is provided with a bottom block (8) at one end close to the telescopic member, and the bottom block (8) is sleeved on the driving shaft of the telescopic member. The bottom block (8) and the top block (6) are integrally formed, and the diameter of the bottom block (8) is larger than the diameter of the top block (6) at one end close to the bottom block (8).

7. A lifting device according to claim 6, characterized in that: The outer diameter of the bottom block (8) matches the inner diameter of the guide cylinder (4).

8. The lifting device according to claim 6, characterized in that: The bottom of the bottom block (8) is chamfered.

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