Special lifting appliance for replacing center of roll grinder

Abstract

The special lifting appliance comprises a clamping ring and a lifting handle used for being connected with a lifting belt, the clamping ring is arranged in front of the center in a sleeved mode, the inner diameter of the clamping ring is matched with the outer diameter of the center, the sleeving stability is guaranteed, at least one through hole is formed in the clamping ring, and the lifting handle is connected with the lifting belt. A through hole is formed in the clamping ring, the through hole corresponds to and is communicated with a large screw hole in the tip so that a screw in the large screw hole can be screwed out conveniently, a connecting screw is further arranged on the clamping ring in a penetrating mode, the connecting screw corresponds to a small screw hole in the tip so that the connecting screw can be conveniently connected with the tip again, the hanging handle is arranged on the clamping ring, and a hanging hole for a hanging belt to penetrate through is formed in the hanging handle. And the lifting movement is controlled by the travelling crane. According to the utility model, the centre can be quickly and safely lifted and moved, and meanwhile, the potential safety hazards of centre falling, personnel injury and the like in the moving process are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of hoisting equipment, in particular to a special lifting tool for replacing the center of a roll grinder. Background Technique

[0002] The roll needs to be ground irregularly on a large grinder by the center grinding method. One end of the roll on the grinder is driven by the main shaft to rotate circumferentially as a whole, and the other end of the roll is supported by the center. Since different types of rolls are ground, it is necessary to replace the corresponding special live center. The center is installed on the tailstock of the grinder by screw connection.

[0003] The common center types in our unit are as Figure 1 and Figure 2 shown. A plurality of small screw holes and a plurality of stepped large screw holes are symmetrically arranged on the center. When grinding the corresponding roll, select the corresponding center and install it on the tailstock of the grinder. First, the original center needs to be removed, and then the corresponding other center needs to be installed to realize the replacement of the center.

[0004] Due to the large size of the center and the lack of a special lifting tool, the conventional disassembly and assembly process of center replacement is as follows: First, unscrew the screws in the small screw holes, and then unscrew some of the screws in the large screw holes. At this time, the connection between the center and the tailstock is realized by relying on the screws in only one or two large screw holes, and these screws are also in a loosened state. Insert one end of a crowbar into the small screw hole located above and the other end away from the set screw. Pass the sling on the crane through the crowbar, and the sling is close to the set screw. Manually press down the end of the crowbar away from the set screw, which is equivalent to a lever operation, as Figure 3 shown. After the crane hoists up and slowly tightens the center with the sling, manually cooperate to smoothly unscrew the remaining one or two screws in the large screw holes. Use a tool to hit the center to make it loose and then the center can be removed. With the cooperation of the crane and manual labor, slowly move the center to the center storage place to realize the removal of the center. By reversing the above operations, the center to be replaced can be reinstalled on the grinder.

[0005] The above disassembly and assembly process of center replacement has the following problems: 1. The crowbar is mostly made of a steel bar. When the sling is lifted up to tighten the crowbar and the center is stressed, the crowbar is easily stressed and bent. 2. During the transfer process of the removed center, it is necessary for the operator to constantly keep pressing down on the end of the crowbar manually, resulting in a large labor intensity. Moreover, there is a risk that the center on the crowbar will fall off, posing safety hazards to both people and objects. Summary of the Invention

[0006] The utility model aims to solve the problems of high labor intensity and certain safety risks during the disassembly, replacement and hoisting of conventional center points. A special lifting tool for replacing the center points of a roll grinder is provided. By using the special lifting tool to assist in the disassembly, installation and hoisting of the center points, the disassembly and installation of the center points can be facilitated, manual operation can be reduced, and the operation safety can be improved at the same time.

[0007] To achieve the above object, the technical solution adopted by the utility model is as follows:

[0008] A special lifting tool for replacing the center points of a roll grinder, comprising a clamping ring and a lifting handle for connecting a sling. The clamping ring is sleeved in front of the center point, and the inner diameter of the clamping ring is adapted to the outer diameter of the center point to ensure stable sleeving. At least one through hole is provided on the clamping ring, and the through hole corresponds to and communicates with the large screw hole on the center point to facilitate the screwing out of the screw in the large screw hole. A connecting screw is also penetrated through the clamping ring, and the connecting screw corresponds to the small screw hole on the center point to facilitate reconnection with the center point. The lifting handle is arranged on the clamping ring, and a sling hole for passing through the sling is provided on the lifting handle to facilitate connection with a traveling crane and control the hoisting movement by the traveling crane.

[0009] Further, the clamping ring is a circular ring body, and the number of the through holes on the clamping ring is two. The two through holes are symmetrically arranged on the clamping ring, and the connection line between the two through holes passes through the center of the clamping ring. The two through holes correspond to and communicate with the two large screw holes on the center point one by one.

[0010] Further, the connecting screw and the connection line between the two through holes form an isosceles triangle, and the length of the connecting screw is greater than the thickness of the clamping ring to facilitate connection with the center point. After the head of the connecting screw extends out of the clamping ring and penetrates into a small screw hole on the center point, the connection reliability between the clamping ring and the center point is improved.

[0011] Further, the lifting handle is perpendicular to the connection line between the two through holes, the lifting handle is arranged towards the center of the clamping ring, one end of the lifting handle is fixedly connected to the clamping ring, and the sling hole is arranged at the other end. The sling hole is a long strip hole to facilitate the passing through of the sling.

[0012] Further, two hand-tightening bolts are symmetrically arranged on the clamping ring. The hand-tightening bolts are arranged along the radial direction of the clamping ring and are threadedly connected with the clamping ring. The heads of the hand-tightening bolts extend into the inner hole of the clamping ring. After the center point is sleeved, the clamping ring and the center point can be conveniently fixed by tightening the hand-tightening bolts.

[0013] Through the above technical solution, the beneficial effects of the utility model are as follows:

[0014] The structure of the utility model is reasonably designed. Instead of using a conventional lever-type disassembly and assembly tool, a clamping ring and a hanging handle are connected and fixed together to form a special lifting tool. The hanging handle is connected to a crane through a sling, which is convenient for the crane to drive the entire special lifting tool for hoisting and moving. The clamping ring is sleeved on the center, realizing the support for the center. At the same time, a connecting screw is also passed through between the center and the clamping ring, which can further ensure the reliability of the connection and support between the clamping ring and the center, preventing the center from detaching.

[0015] During the hoisting and transfer process of the center of the utility model, there is no need for manual long-term support. Through the sleeving of the clamping ring and the connection of the connecting screw, two-stage means are adopted to realize the connection and support for the center, effectively preventing the center from detaching from the clamping ring, avoiding dropping during the hoisting process, and improving the safety of the center hoisting. The application of the hand-tightening bolt can further realize the fixation of the center and enhance the fixation between the clamping ring and the center.

[0016] The utility model adopts a special lifting tool that matches the center, which can easily disassemble, assemble, hoist and move the center, facilitating manual operation, reducing the labor intensity of manual operation, and making the replacement of the center more convenient, fast, time-saving and labor-saving. This special lifting tool can quickly and safely lift and move the center, while avoiding safety hazards such as the center dropping and personnel being injured during the moving process. Description of the Drawings

[0017] Figure 1 are the front views of two existing centers.

[0018] Figure 2 are the side views of the existing centers.

[0019] Figure 3 is a schematic diagram of the conventional state of center disassembly, hoisting and transferring. The arrow in the figure indicates that manual force needs to be applied downward.

[0020] Figure 4 is the front view of a special lifting tool for replacing the center of a roll grinder according to the utility model.

[0021] Figure 5 is the cross-sectional view of a special lifting tool for replacing the center of a roll grinder according to the utility model.

[0022] Figure 6 is the schematic diagram of the application state of a special lifting tool for replacing the center of a roll grinder according to the utility model.

[0023] Figure 7 is the installation schematic diagram of the hand-tightening bolt of a special lifting tool for replacing the center of a roll grinder according to the utility model.

[0024] The reference numerals in the drawings are: 1 center point, 2 large screw hole, 3 small screw hole, 4 pry bar, 5 sling, 6 clamping ring, 7 lifting handle, 8 through hole, 9 connecting screw, 10 lifting hole, 11 hand-tightening bolt. Detailed implementation manners

[0025] The following makes a detailed description of the detailed implementation manners of the present utility model in conjunction with the drawings:

[0026] As Figures 4 to 7 shown, a special lifting tool for replacing the center point of a roll grinder includes a clamping ring 6 and a lifting handle 7 for connecting a sling 5. The clamping ring 6 is of a circular ring body structure. The clamping ring 6 is sleeved in front of the center point 1. The inner diameter of the clamping ring 6 is adapted to the outer diameter of the center point 1. Therefore, when the clamping ring 6 is moved back and forth with force, the center point 1 can be driven to move and loosen it.

[0027] After the clamping ring 6 is sleeved in front of the center point 1, the clamping ring 6 will block the small screw hole 3 and the large screw hole 2 on the center point 1. In order to screw out the screw in the large screw hole 2, at least one through hole 8 is opened on the clamping ring 6. The through hole 8 corresponds to and communicates with the large screw hole 2 on the center point 1.

[0028] In this embodiment, the number of through holes 8 on the clamping ring 6 is two. The two through holes 8 are symmetrically arranged on the clamping ring 6. The connecting line between the two through holes 8 passes through the center of the clamping ring 6. The two through holes 8 correspond to and communicate with the two large screw holes 2 on the center point 1 one by one. The function of the through hole 8 is to facilitate a hexagon wrench tool to pass through the clamping ring 6 to screw the screw in the large screw hole 2.

[0029] As Figure 4 and Figure 5 shown, in order to improve the reliability of the sleeving of the clamping ring 6 and the center point 1, a connecting screw 9 is also penetrated through the clamping ring 6. The connecting screw 9 and the connecting line between the two through holes 8 form an isosceles triangle. The length of the connecting screw 9 is greater than the thickness of the clamping ring 6, which is convenient for the connecting screw 9 to connect the center point 1. When the connecting screw 9 is in use, the connecting screw 9 corresponds to the small screw hole 3 on the center point 1. Further, after the head of the connecting screw 9 extends out of the clamping ring 6, it penetrates into a small screw hole 3 on the center point 1, realizing the connection between the clamping ring 6 and the center point 1 again and ensuring the reliability of the connection.

[0030] A lifting handle 7 is arranged on the clamping ring 6. The lifting handle 7 is equivalent to the handle of the entire lifting tool. The lifting handle 7 is arranged towards the center of the clamping ring 6 and is perpendicular to the connecting line between the two through holes 8. A lifting hole 10 for penetrating a sling 5 is opened on the lifting handle 7. The lifting hole 10 is a long strip hole, that is, one end of the lifting handle 7 is fixedly connected to the clamping ring 6 and the other end is provided with the lifting hole 10. Manually operating the lifting handle 7 can move the clamping ring 6 back and forth. At the same time, the traveling crane is connected to the lifting handle 7 through the sling 5, and the movement of the entire special lifting tool can be realized by using the traveling crane.

[0031] The principle of this utility model is as follows: First, unscrew the screw in the small screw hole 3 on the center point 1, and then unscrew some of the screws in the large screw hole 2. At this time, the connection between the center point 1 and the tailstock is achieved by relying on only the two screws in the large screw hole 2. These two screws are in a loosened state, but they are not pulled out of the large screw hole 2. After the lifting handle 7 is connected to the crane through the sling 5, the special lifting tool is in a suspended state. The clamping ring 6 is sleeved in front of the center point 1, and the connecting screw 9 is inserted into the small screw hole 3 located above, as Figure 6 shown.

[0032] After the crane lifts and rises, and the center point 1 is slowly tightened by using the clamping ring 6, the clamping ring 6 is stressed on the center point 1. Manually use a hexagon wrench to pass through the through hole 8 to unscrew the screws in the two large screw holes 2, and then manually operate the lifting handle 7 to shake the clamping plate to loosen it, and then the center point 1 can be slowly removed from the tailstock. At this time, there is no need for manual operation and support, and the center point 1 can be transported to the storage place by using the crane. Conversely, the center point 1 can be installed.

[0033] In order to optimize the product structure and ensure the reliability of the clamping ring 6 sleeved on the center point 1, two hand-tightening bolts 11 are symmetrically arranged on the clamping ring 6. The hand-tightening bolts 11 are arranged radially along the clamping ring 6. The hand-tightening bolts 11 are threadedly connected to the clamping ring 6, and the heads of the hand-tightening bolts 11 extend into the inner hole of the clamping ring 6, as Figure 7 shown. After the clamping ring 6 is sleeved on the center point 1, tightening the hand-tightening bolts 11 realizes the fixation of the clamping ring 6 and the center point 1, which can better shake the center point 1 to loosen it, and at the same time prevent the center point 1 from detaching from the clamping ring 6, ensuring the safety and reliability of the lifting process.

[0034] The above-mentioned embodiments are only the preferred embodiments of this utility model, and do not limit the scope of implementation of this utility model. Therefore, all equivalent changes or modifications made according to the structure, features and principles described in the scope of this utility model patent should be included in the scope of this utility model's patent application.

Claims

1. A special lifting device for replacing the top of a roll grinder, characterized in that: The invention comprises a clamping ring (6) and a hanging handle (7) for connecting a sling (5), wherein the clamping ring (6) is sleeved in front of the top (1), the inner diameter of the clamping ring (6) is matched with the outer diameter of the top (1), at least one through hole (8) is provided on the clamping ring (6), the through hole (8) corresponds to and is connected with a large screw hole (2) on the top (1), a connecting screw (9) is also passed through the clamping ring (6), the connecting screw (9) corresponds to a small screw hole (3) on the top (1), the clamping ring (6) is provided with the hanging handle (7), and a hanging hole (10) for passing the sling (5) is provided on the hanging handle (7).

2. A special lifting device for replacing the top of a roll grinder according to claim 1, characterized in that: The clamping ring (6) is a circular ring body. The number of the through holes (8) on the clamping ring (6) is two. The two through holes (8) are symmetrically arranged on the clamping ring (6). The connecting line between the two through holes (8) passes through the center of the clamping ring (6). The two through holes (8) and the two large screw holes (2) on the top (1) correspond to each other one by one and are connected.

3. A special lifting device for replacing the top of a roll grinder according to claim 2, characterized in that: The connecting line between the connecting screw (9) and the two through holes (8) is an isosceles triangle. The length of the connecting screw (9) is greater than the thickness of the clamping ring (6). After the head of the connecting screw (9) extends out of the clamping ring (6), it penetrates into a small screw hole (3) on the top (1).

4. A special lifting device for replacing the top of a roll grinder according to claim 2, characterized in that: The hanging handle (7) is perpendicular to the line between the two through holes (8), and is arranged toward the center of the clamping ring (6). One end of the hanging handle (7) is fixedly connected to the clamping ring (6), and the other end is provided with the hanging hole (10), which is a long hole.

5. The special lifting device for replacing the top of a roll grinder according to claim 2, characterized in that: Two hand-tightening bolts (11) are symmetrically arranged on the clamping ring (6). The hand-tightening bolts (11) are arranged radially along the clamping ring (6) and are threadedly connected to the clamping ring (6). The heads of the hand-tightening bolts (11) extend into the inner holes of the clamping ring (6).

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