A method and apparatus for facilitating the removal and installation of a downthrow head assembly

Abstract

The application discloses a method and device for conveniently dismounting and mounting a lower throwing head assembly, relates to maintenance of a shot blasting machine in a steel manufacturing flow line, and can assist workers in the pit of the shot blasting machine to efficiently replace the lower throwing head assembly. The fixed lifting point is used to suspend a lifting coil, the lifting coil and the fixed hinge point are used to jointly control the lifting of a special support, the dependence on manpower is reduced, safety of the workers is ensured, and the risk of the lower throwing head assembly falling off during the dismounting process can be effectively avoided. The application preliminarily lowers the lower throwing head assembly by using the lifting coil, leaves enough space for erecting a temporary lifting point, suspends a second lifting coil above the center of mass of the lower throwing head assembly by erecting the temporary lifting point, replaces the first lifting coil with the second lifting coil, stably lowers the lower throwing head assembly to the bottom of the pit of the shot blasting machine, and avoids the imbalance of the lower throwing head assembly during the lifting process and the safety accidents caused by the imbalance.

Description

Technical Field

[0001] This invention relates to the field of steel manufacturing equipment maintenance technology, specifically to a method and apparatus for facilitating the disassembly and installation of the lower blast head assembly. Background Technology

[0002] Through-type shot blasting machines are a type of equipment commonly used in the steel manufacturing industry. They use a high-speed rotating shot blasting wheel or impeller to project shot onto the metal surface at high speed. Through impact and friction, the shot removes dirt, scale, rust and other impurities from the metal surface, increases the roughness and adhesion of the metal surface, and makes the metal surface smooth and flat.

[0003] The shot blasting machine pit is an important component of a through-type shot blasting machine. Located below the machine, its main function is to contain and handle the shot and impurities generated during the blasting process. During shot blasting, the shot impacts the workpiece and scatters, some of which falls into the pit. The pit is typically equipped with a recovery device, such as a screw conveyor or scraper conveyor, to collect the scattered shot and transport it to the shot blasting machine's shot circulation system for reuse.

[0004] The shot blasting assembly of a through shot blasting machine is usually arranged in an upper and lower layout. The lower shot blasting assembly is located in the pit. The shot blasting assembly is often in a harsh working environment and is a component with a high failure rate. During maintenance, if only the motor of the shot blasting assembly is replaced, it is easy to find that the impeller of the shot blasting assembly is not compatible with the motor shaft and housing. Therefore, when a failure occurs, the entire assembly needs to be disassembled and replaced.

[0005] The weight of the shot blasting head assembly of a large shot blasting machine is usually 400 to 600 kg, and it needs to be installed at an angle on the shot blasting machine. Since the shot blasting head assembly is located in the pit and is often obscured by the rest of the shot blasting machine, it is impossible to use large lifting equipment to lift it. Multiple people need to enter the pit and work together to remove the shot blasting head assembly. However, the pit is not only small in terms of working space, but also often has shot material piled up at the bottom. On the one hand, this leads to low maintenance efficiency, as replacing a shot blasting head assembly requires at least 6 man-hours. On the other hand, it is easy for workers to have safety accidents. Summary of the Invention

[0006] The purpose of this invention is to address the problems existing in the prior art by providing a method and apparatus for easily disassembling and installing the lower throwing head assembly.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A method for facilitating the disassembly and installation of the lower throwing head assembly includes the following steps:

[0009] Fixed lifting points and fixed hinge points are added to the upper and lower parts of each lower shot head assembly of the shot blasting machine. When the lower shot head assembly fails, the shot blasting machine stops and the special support is sent into the shot blasting machine pit.

[0010] A hoist is installed at the fixed lifting point. The top of the special bracket is rotatably connected to the fixed hinge point. The hoist is used to lift the end of the special bracket and install the special bracket onto the lower throwing head assembly.

[0011] Remove the lower shot blasting head assembly from the shot blasting machine, lower the end of the special bracket to a preset height one, set up a temporary lifting point in the conveyor roller of the shot blasting machine, set up a second hoist at the temporary lifting point, and connect the hook of the second hoist through the shot blasting head mounting hole of the shot blasting machine to the lower shot blasting head assembly.

[0012] Separate the special bracket from the fixed hinge point, lower the special bracket to the bottom of the pit using hoist one and hoist two, replace the lower throwing head assembly, and then use hoist two to raise the new lower throwing head assembly to the preset height two;

[0013] Connect the special bracket using the hoist one and the fixed hinge point, install the special bracket onto the lower shot blasting head assembly, remove the hoist two and the temporary lifting point, use the hoist one to raise the lower shot blasting head assembly to the shot blasting head mounting hole, and install the lower shot blasting head assembly onto the shot blasting machine.

[0014] The method provided by this invention can assist workers in the shot blasting machine pit to efficiently replace the lower shot head assembly. The hoist is suspended by the fixed lifting point, and the hoist and the fixed hinge point jointly control the lifting and lowering of the special support. This not only reduces the reliance on manpower, but also provides safety for personnel and effectively avoids the risk of the lower shot head assembly falling off during dismantling.

[0015] Meanwhile, the present invention utilizes the first hoist to initially lower the lower blasting head assembly, leaving sufficient space for setting up the temporary lifting point. By setting up the temporary lifting point, the second hoist can be suspended above the center of gravity of the lower blasting head assembly. The second hoist then replaces the first hoist, stably lowering the lower blasting head assembly to the bottom of the shot blasting machine pit, thus avoiding safety accidents caused by the lower blasting head assembly becoming unbalanced during the lifting and lowering process.

[0016] Preferably, the fixed lifting point is located on the shot blasting head side of the lower shot blasting head assembly, the fixed hinge point is located on the motor side of the lower shot blasting head assembly, the fixed lifting point includes a lifting lug, the fixed hinge point includes a plurality of mutually parallel ear plates, and the lifting lug and the ear plates are respectively disposed on the outer wall of the shot blasting machine.

[0017] The fixed lifting point and the fixed hinge point can be directly welded to the outer wall of the existing shot blasting machine, so that the method provided by the present invention can be directly applied to existing production lines without the need to specially manufacture a new model of shot blasting machine.

[0018] Preferably, the temporary lifting point includes a support pipe, which is mounted on the rollers of the conveyor roller conveyor, and the hoist is suspended from the support pipe by a steel wire rope rigging.

[0019] The conveyor rollers of the shot blasting machine can accommodate personnel, making the erection of the temporary lifting points relatively simple.

[0020] Preferably, a steel wire rope is attached to the center of gravity of the lower throwing head assembly, and the lower throwing head assembly is connected to the hook of the second hoist via the steel wire rope.

[0021] Preferably, when installing the special bracket, the special bracket is rotatably connected to the fixed hinge point via a pin, and the special bracket is secured to the lower throwing head assembly via a pair of clamping plates.

[0022] When the hoist pulls up or lowers the end of the special support, the special support will rotate around the fixed hinge point. During this process, the displacement of the two ends of the special support is limited by the hoist and the fixed hinge point respectively, so that the special support and the lower throwing head assembly can remain stable and will not sway around, thus avoiding the lower throwing head assembly from injuring the workers.

[0023] Preferably, when the end of the special support is lowered to a preset height one, the lower blasting head assembly is disengaged from the shot blasting machine to expose the blasting head mounting hole. When the lower blasting head assembly is raised to a preset height two, a gap is left between the lower blasting head assembly and the bottom of the pit to allow for the installation of the special support.

[0024] Preferably, before disassembling the lower throwing head assembly, the motor wiring and throwing head feed conduit of the lower throwing head assembly are disconnected. After the installation of the lower throwing head assembly is completed, the special bracket is separated from the lower throwing head assembly, the motor wiring and throwing head feed conduit of the lower throwing head assembly are installed, a safety test run is conducted, and it is confirmed whether the throwing head rotation direction of the lower throwing head assembly is correct.

[0025] Preferably, the system includes the dedicated bracket, which comprises a support frame, a fixing plate, and a clamping assembly. The support frame includes parallel support rods, on which the fixing plate is mounted. The clamping assembly is located between the fixing plates, and the fixing plate has a plurality of sliding grooves. The clamping assembly is slidably connected to the fixing plate through the sliding grooves.

[0026] Since the specific installation positions of each of the lower throwing head assemblies are not the same, the position of the clamping component on the support frame needs to be adjusted by the slide groove to make the special bracket versatile.

[0027] Preferably, the clamping assembly includes a first clamping plate and a second clamping plate. Since the lower throwing head assembly is installed at an angle and the motor and throwing head of the lower throwing head assembly have different weights, in order to keep the lower throwing head assembly in a horizontal position during lifting and lowering, the height of the first clamping plate is lower than the height of the second clamping plate. The top of the first clamping plate is provided with a groove for abutting against the motor of the lower throwing head assembly, and the second clamping plate is used to abut against the throwing head of the lower throwing head assembly.

[0028] Preferably, one end of the fixing plate is provided with a connecting hole for setting a pin, a connecting plate is provided between the support rods, and a through hole is provided on the connecting plate. The hook of the hoist is connected to the special bracket through the through hole.

[0029] Compared with the prior art, the beneficial effects of the present invention are:

[0030] (1) The method provided by the present invention can help the workers in the pit of the shot blasting machine to efficiently replace the lower shot head assembly. The hoist is suspended by a fixed lifting point, and the hoist and the fixed hinge point jointly control the lifting and lowering of the special support. This not only reduces the reliance on manpower, but also provides safety for the personnel and can effectively avoid the risk of the lower shot head assembly falling off during the dismantling process.

[0031] (2) At the same time, the present invention uses hoist one to initially lower the lower blasting head assembly, leaving enough space for setting up temporary lifting points. By setting up temporary lifting points, hoist two can be suspended above the center of gravity of the lower blasting head assembly. Hoist two is then used to replace hoist one to stably lower the lower blasting head assembly to the bottom of the shot blasting machine pit, thus avoiding the lower blasting head assembly from becoming unbalanced during the lifting and lowering process and causing safety accidents. Attached Figure Description

[0032] Figure 1 This is a schematic diagram illustrating the process of disassembling and installing the lower throwing head assembly in this invention;

[0033] Figure 2 This is a schematic diagram of a through-type shot blasting machine in an embodiment of the present invention;

[0034] Figure 3 This is a front view of the shot blasting machine in an embodiment of the present invention;

[0035] Figure 4 This is a side view of the shot blasting machine in an embodiment of the present invention;

[0036] Figure 5This is a schematic diagram of the state of step S4 in an embodiment of the present invention;

[0037] Figure 6 This is a schematic diagram of the state of step S6 in an embodiment of the present invention;

[0038] Figure 7 This is a schematic diagram of the structure of the special bracket in an embodiment of the present invention;

[0039] In the diagram: 1. Shot blasting machine pit; 2. Shot blasting machine; 3. Lower shot blasting head assembly; 4. Fixed lifting point; 5. Fixed hinge point; 6. Hoist 1; 7. Hoist 2; 8. Special bracket; 9. First clamping plate; 10. Second clamping plate; 11. Fixing plate; 12. Connecting plate; 13. Support frame; 14. Conveying roller conveyor. Detailed Implementation

[0040] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] In the description of this invention, it should be noted that the terms "middle", "upper", "lower", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0042] like Figures 1-6 As shown, the specific solution of the embodiment is as follows: In order to solve the problem that the replacement of the lower shot blasting head assembly 3 is time-consuming, labor-intensive and prone to safety accidents, the present invention provides a replacement method and a special bracket 8 customized for the lower shot blasting head assembly 3, so as to help the workers in the shot blasting machine pit 1 to replace the lower shot blasting head assembly 3 efficiently. In practical application, the method provided by the present invention can reduce the maintenance time from 6 hours to 3-4 hours, and reduce the production loss caused by the long downtime of the shot blasting machine 2.

[0043] A device for easy disassembly and installation of the lower throwing head assembly 3 includes a special bracket 8. The special bracket 8 includes a support frame 13, a fixing plate 11, and a clamping assembly. The support frame 13 includes parallel support rods. A connecting plate 12 and a connecting rod are provided between the support rods. The connecting plate 12 is located at the end of the support frame 13. The connecting rod is located on the other side away from the support frame 13. The connecting plate 12 has a through hole. The hook of the hoist 6 is connected to the special bracket 8 through the through hole.

[0044] The support rod is provided with a fixing plate 11, and the clamping assembly is located between the fixing plates 11. The fixing plate 11 is provided with several sliding grooves. The clamping assembly is slidably connected to the fixing plate 11 through the sliding grooves. When it is necessary to fix the clamping assembly, the clamping assembly is fixed to the fixing plate 11 by using bolts passing through the sliding grooves. One end of the fixing plate 11 is provided with a connecting hole for setting a pin.

[0045] The clamping assembly includes a first clamping plate 9 and a second clamping plate 10. The height of the first clamping plate 9 is lower than the height of the second clamping plate 10. The top of the first clamping plate 9 is provided with a groove for contacting the motor of the lower throwing head assembly 3. The second clamping plate 10 is used to contact the throwing head of the lower throwing head assembly 3.

[0046] A method for facilitating the disassembly and installation of the lower throwing head assembly 3 includes the following steps:

[0047] S1. During routine shutdown maintenance, fixed lifting points 4 and fixed hinge points 5 are added to the upper and lower sides of each lower blasting head assembly 3 of the shot blasting machine 2. The fixed lifting points 4 are located on the blasting head side of the lower blasting head assembly 3, and the fixed hinge points 5 are located on the motor side of the lower blasting head assembly 3. The fixed lifting points 4 include a pair of lifting lugs located on both sides of the lower blasting head assembly 3. The fixed hinge points 5 include several parallel ear plates. The lifting lugs and ear plates are respectively set on the outer wall of the shot blasting machine 2.

[0048] S2. When the shot blasting head assembly 3 fails, the shot blasting machine 2 is stopped. Various tools are prepared, including hoists 6 and 7, which are either manual or electric. The tools are sent into the shot blasting machine pit 1, and the staff removes the motor wiring and the shot blasting head feed pipe of the faulty shot blasting head assembly 3.

[0049] S3. A hoist 6 is installed at the fixed lifting point 4. The hoist 6 is suspended below the two lifting lugs by a steel wire rope. The top of the special bracket 8 is rotatably connected to the fixed hinge point 5 by a pin. The hoist 6 is used to pull up the end of the special bracket 8 through the hook. The operator adjusts the position of the clamping component on the special bracket 8 according to the position of the lower throwing head assembly 3, so that the clamping component is below the lower throwing head assembly 3. At the same time, the distance between the first clamping plate 9 and the second clamping plate 10 is adjusted so that the first clamping plate 9 is below the motor of the lower throwing head assembly 3 and the second clamping plate 10 is below the throwing head of the lower throwing head assembly 3.

[0050] S4. Use hoist 6 to lift the special bracket 8, so that the groove of the first clamping plate 9 abuts against the motor of the lower throwing head assembly 3, and the second clamping plate 10 abuts against the protrusion of the throwing head end cap handle of the lower throwing head assembly 3. At the same time, use hoist 6 to tighten the special bracket 8, so that the special bracket 8 is locked onto the lower throwing head assembly 3.

[0051] S5. Remove the lower blasting head assembly 3 from the shot blasting machine 2. At this time, the weight of the lower blasting head assembly 3 is borne by the special support 8, and the weight of the special support 8 is shared by two fulcrums, which help the special support 8 maintain balance. Operate the hoist 6 to lower the end of the special support 8 to a preset height to expose the blasting head mounting hole. At this time, the lower blasting head assembly 3 is disengaged from the shot blasting machine 2, and the lower blasting head assembly 3 approaches a horizontal state from an inclined state.

[0052] S6. A temporary lifting point is set up in the conveyor roller 14 of the shot blasting machine 2. The temporary lifting point includes a support pipe, which is mounted on the rollers of the conveyor roller 14. The hoist 2 7 is suspended on the support pipe by a steel wire rope. The hook of the hoist 2 7 is lowered so that the hook of the hoist 2 7 passes through the internal space of the shot blasting machine 2 and enters the shot blasting machine pit 1 through the shot blasting head mounting hole. A steel wire rope is attached to the motor of the lower shot blasting head assembly 3. The steel wire rope is located at the center of mass of the lower shot blasting head assembly 3. The lower shot blasting head assembly 3 is connected to the hook of the hoist 2 7 by the steel wire rope.

[0053] S7. Remove the pin, separate the special bracket 8 from the fixed hinge point 5, and lower the special bracket 8 to the bottom of the pit using hoist 6 and hoist 7. During this process, hoist 7 mainly bears the weight of the lower throwing head assembly 3, while the special bracket 8 controlled by hoist 6 plays a protective role. Separate hoist 7 from the lower throwing head assembly 3 and remove the faulty lower throwing head assembly 3.

[0054] S8. Transport the new lower blasting head assembly 3 into the shot blasting machine pit 1, and then use hoist 2 7 to raise the new lower blasting head assembly 3 to the preset height 2, so that the lower blasting head assembly 3 leaves a gap with the bottom of the pit.

[0055] S9. Use hoist 6 and fixed hinge point 5 to connect special bracket 8 to install special bracket 8 onto lower shot blasting head assembly 3. Remove hoist 7 and temporary lifting point, use hoist 6 to lift lower shot blasting head assembly 3 to shot blasting head mounting hole, and install lower shot blasting head assembly 3 onto shot blasting machine 2.

[0056] S10. After completing the installation of the lower throwing head assembly 3, separate the special bracket 8 from the lower throwing head assembly 3, remove the special bracket 8 and the hoist 6, install the motor wiring and throwing head feed pipe of the lower throwing head assembly 3, conduct a safety test run, and confirm whether the throwing head rotation direction of the lower throwing head assembly 3 is correct.

[0057] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for facilitating the disassembly and installation of a lower throwing head assembly, characterized in that, Includes the following steps: Fixed lifting points and fixed hinge points are added to the upper and lower parts of each lower shot head assembly of the shot blasting machine. When the lower shot head assembly fails, the shot blasting machine stops and a special support is sent into the shot blasting machine pit. A hoist is installed at the fixed lifting point. The top of the special bracket is rotatably connected to the fixed hinge point. The hoist is used to lift the end of the special bracket and install the special bracket onto the lower throwing head assembly. Remove the lower shot blasting head assembly from the shot blasting machine, lower the end of the special bracket to a preset height one, set up a temporary lifting point in the conveyor roller of the shot blasting machine, set up a second hoist at the temporary lifting point, and connect the hook of the second hoist through the shot blasting head mounting hole of the shot blasting machine to the lower shot blasting head assembly. Separate the special bracket from the fixed hinge point, lower the special bracket to the bottom of the pit using hoist one and hoist two, replace the lower throwing head assembly, and then use hoist two to raise the new lower throwing head assembly to the preset height two; Connect the special bracket using the hoist one and the fixed hinge point, install the special bracket onto the lower shot blasting head assembly, remove the hoist two and the temporary lifting point, use the hoist one to raise the lower shot blasting head assembly to the shot blasting head mounting hole, and install the lower shot blasting head assembly onto the shot blasting machine.

2. The method for facilitating the disassembly and installation of the lower throwing head assembly according to claim 1, characterized in that, The fixed lifting point is located on the shot blasting head side of the lower shot blasting head assembly, and the fixed hinge point is located on the motor side of the lower shot blasting head assembly. The fixed lifting point includes a lifting lug, and the fixed hinge point includes several parallel ear plates. The lifting lug and the ear plates are respectively disposed on the outer wall of the shot blasting machine.

3. The method for facilitating the disassembly and installation of the lower throwing head assembly according to claim 1, characterized in that, The temporary lifting point includes a support pipe, which is mounted on the rollers of the conveyor roller table, and the hoist is suspended from the support pipe by steel wire ropes.

4. The method for facilitating the disassembly and installation of the lower throwing head assembly according to claim 1, characterized in that, A steel wire rope is attached to the center of gravity of the lower throwing head assembly, and the lower throwing head assembly is connected to the hook of the second hoist via the steel wire rope.

5. The method for facilitating the disassembly and installation of the lower throwing head assembly according to claim 1, characterized in that, When installing the special bracket, the special bracket is rotatably connected to the fixed hinge point via a pin, and the special bracket is secured to the lower throwing head assembly via a pair of clamping plates.

6. The method for facilitating the disassembly and installation of the lower throwing head assembly according to claim 1, characterized in that, When the end of the special support is lowered to a preset height one, the lower blasting head assembly is disengaged from the shot blasting machine to expose the blasting head mounting hole. When the lower blasting head assembly is raised to a preset height two, a gap is left between the lower blasting head assembly and the bottom of the pit to allow for the installation of the special support.

7. The method for facilitating the disassembly and installation of the lower throwing head assembly according to claim 1, characterized in that, Before disassembling the lower throwing head assembly, disconnect the motor wiring and the throwing head feed conduit of the lower throwing head assembly. After completing the installation of the lower throwing head assembly, separate the special bracket from the lower throwing head assembly, install the motor wiring and the throwing head feed conduit of the lower throwing head assembly, conduct a safety test run, and confirm whether the throwing head rotation direction of the lower throwing head assembly is correct.

8. A device for facilitating the disassembly and installation of the lower throwing head assembly according to any one of claims 1 to 7, characterized in that, The system includes a dedicated bracket, which comprises a support frame, a fixing plate, and a clamping assembly. The support frame includes parallel support rods, on which the fixing plate is mounted. The clamping assembly is located between the fixing plates, and the fixing plate has several sliding grooves. The clamping assembly is slidably connected to the fixing plate through the sliding grooves.

9. The device for facilitating the disassembly and installation of the lower throwing head assembly according to claim 8, characterized in that, The clamping assembly includes a first clamping plate and a second clamping plate. The height of the first clamping plate is lower than the height of the second clamping plate. The top of the first clamping plate is provided with a groove for abutting against the motor of the lower throwing head assembly. The second clamping plate is used to abut against the throwing head of the lower throwing head assembly.

10. The device for facilitating the disassembly and installation of the lower throwing head assembly according to claim 8, characterized in that, One end of the fixing plate is provided with a connecting hole for setting a pin. A connecting plate is provided between the support rods, and a through hole is provided on the connecting plate. The hook of the hoist is connected to the special bracket through the through hole.

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