Heavy rotary powder metallurgy compact hoisting tool and hoisting method

Abstract

The invention provides a heavy rotary powder metallurgy compact hoisting tool and a hoisting method, belongs to the technical field of hoisting tools, and solves the problems of complicated operation, high labor intensity, more required personnel and high use cost in the prior art. The device comprises at least two sets of flexible assemblies surrounding a pressed blank, each flexible assembly comprises a flexible connecting piece and connecting pieces connected to the two ends of the flexible connecting piece, a clamping plate is connected to the side, close to the pressed blank, of each flexible connecting piece, and a right-hand and left-hand stud is connected between every two adjacent connecting pieces in a threaded mode. The at least two sets of flexible connecting pieces are adjusted through the right-hand and left-hand screw studs, so that the pressed blank is surrounded and pressed tightly, fixed lifting of the pressed blank is achieved, operation is easy, the labor intensity is low, the number of needed workers is small, the structure is simple, and the manufacturing cost is low.

Description

Technical Field

[0001] The invention belongs to the technical field of lifting tooling, and in particular to a heavy-duty rotary powder metallurgy compact lifting tooling and a lifting method. Background Art

[0002] Powder metallurgy is a process technology for preparing metal powder and using forming and sintering processes to make metal powder (or a mixture of metal powder and non-metallic powder) into products. Powder metallurgy has low manufacturing costs and is suitable for processing active metals and high melting point metals. It has been widely used in various fields. The powder metallurgy process mainly includes four steps: powder preparation, powder processing and forming, powder sintering, and post-sintering treatment. Among them, the powder particles in the powder metallurgy compact obtained by processing and forming maintain the shape of the compact through mechanical meshing, and have a certain shape and strength. At this time, the compact has not yet undergone sintering, and the powder particles in the compact maintain the shape of the compact through mechanical meshing. The density of the powder metallurgy compact is generally 60%-80% of the density of the sintered product, and its strength is low, easy to crack and fragile, so powder metallurgy compacts are difficult, especially heavy powder metallurgy compacts (>50kg). During operation, it is easy to cause problems such as damage to the shape of the compact and the compact falling out of the lifting tooling.

[0003] Lifting tooling is essential for the successful lifting of powder metallurgy compacts. In industry, powder metallurgy production workshops mostly use a combination of hemp rope and crane or a manipulator to lift the compacts. For the first method, at least two operators are required to bundle the compacts, and multiple pre-liftings are required to determine the appropriate tightness of the compact bundling for compacts with varying shapes and sizes. The number of pre-liftings is closely related to the operator's work experience. Therefore, the use of hemp ropes for lifting is time-consuming and labor-intensive, and requires a large number of people. The second method can be automated to reduce the labor cost of lifting the compacts. However, the powder metallurgy compacts have low density, low strength, and are easy to crack and break. The manipulator can easily pinch the compacts and destroy their shape. In addition, the manipulator that lifts heavy compacts often weighs more than 2 tons, and it occupies a large area and has high equipment costs. Summary of the invention

[0004] In view of the above problems, the purpose of the present invention is to provide a heavy-duty rotary powder metallurgy billet lifting tooling and a lifting method, in which at least two sets of flexible connectors are adjusted by positive and negative thread studs to embrace and press the billet, thereby achieving fixed lifting of the billet, which is simple to operate, has low labor intensity, requires fewer people, has a simple structure and low manufacturing cost.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A heavy-duty rotary powder metallurgy compact lifting tool comprises at least two sets of flexible components that embrace the compact, wherein the flexible components comprise a flexible connector and connectors connected at both ends of the flexible connector, a splint is connected to the side of the flexible connector close to the compact, and positive and negative thread studs are threadedly connected between two adjacent connectors.

[0007] Preferably, the flexible connecting member is a connecting rope or a chain.

[0008] Preferably, the flexible connecting member is a transmission chain or a conveyor chain in a chain.

[0009] Preferably, a screw is passed through the side of the clamping plate close to the pressed blank, and the screw passes through the hole on the chain and is threadedly connected to a matching plate abutting against the chain.

[0010] Preferably, the connection point between the clamping plate and the chain is only provided at one place.

[0011] Preferably, the clamping plate is an elastic plate.

[0012] Preferably, a nut is fixedly sleeved on the positive and negative thread studs.

[0013] Preferably, a lifting lug is connected to the connecting piece.

[0014] A method for lifting heavy rotary powder metallurgy compacts, using the lifting tool for lifting, the method comprising the following steps:

[0015] S1. Calculate the length and quantity of the flexible components required according to the outer diameter of the pressed blank to be lifted, connect the flexible components end to end, and obtain a lifting tool that can be inserted into the pressed blank;

[0016] S2, putting the lifting tooling onto the outer surface of the pressed blank, connecting the lower end of the lifting tool to the lifting lug, and connecting the upper end of the lifting tool to the crane hook;

[0017] S3, rotate the positive and negative thread studs, gradually reduce the inner diameter of the lifting tooling and perform pre-lifting, observe whether the lifting tooling has any movement or trend relative to the pressed blank, if there is any movement or trend, continue to reduce the inner diameter of the lifting tooling, otherwise stop;

[0018] S4. Formal lifting, operate the crane, lift the pressed billet to the designated location, and then dismantle the tooling.

[0019] Preferably, in step S3, when the pressed blank can be stably lifted, a torque wrench is used to rotate the positive and negative wire studs to test the torque exerted on the positive and negative wire studs, and the magnitude of the torque and the weight of the pressed blank are recorded.

[0020] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0021] At least two groups of flexible connectors are adjusted through positive and negative thread studs to embrace and press the pressed green sheet, thereby achieving fixed lifting of the pressed green sheet, which has simple operation, low labor intensity, few personnel required, simple structure and low manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 A schematic diagram of a three-dimensional structure provided by an embodiment of the present invention;

[0024] Figure 2 A schematic diagram of the structure of the splint connection provided by an embodiment of the present invention;

[0025] Figure 3 A schematic diagram of the use status provided by an embodiment of the present invention;

[0026] Figure 4 A schematic diagram of a usage status provided for another embodiment of the present invention.

[0027] Figure numerals: 1-lifting ear; 2-connecting piece; 3-flexible connecting piece; 4-nut; 5-positive and negative thread studs; 6-clamp; 7-matching plate; 8-screw; 9-hanging device. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the application is usually placed when used. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] Combine the following Figure 1-Figure 4 The present invention is described in detail.

[0032] Example

[0033] A heavy-duty rotary powder metallurgy compact lifting tool comprises at least two sets of flexible components that embrace the compact, the flexible components comprising a flexible connector 3 and connectors 2 connected at both ends of the flexible connector 3, a splint 6 is connected to the side of the flexible connector 3 close to the compact, and positive and negative thread studs 5 are threadedly connected between two adjacent connectors 2.

[0034] Two or more flexible connectors 3 are connected end to end through positive and negative thread studs 5 to form an annular lifting fixture. The positive and negative thread studs 5 are then rotated according to the size of the pressed billet to adjust the inner diameter of the lifting fixture so that the lifting fixture can be pressed tightly against the surface of the pressed billet, thereby realizing the lifting of the pressed billet.

[0035] like Figure 4 As shown, the flexible connectors 3 are connected in three groups, and the number of the flexible connectors 3 is selected according to the size of the compact.

[0036] The flexible connector 3 is a connecting rope or chain, and both the connecting rope and the chain can be changed and adjusted according to the outer diameter of the blank. The chain includes a transmission chain, a conveyor chain and a towing chain. It is preferred to use a transmission chain or a conveyor chain in the chain to facilitate the installation of the clamp 6 while avoiding the situation that all the connecting ropes or towing chains are not on the same horizontal plane (i.e., the tilting situation that one side of the lifting fixture is high and the other side is low), resulting in the lifting fixture being unable to apply force evenly to the blank, and the transmission chain and the conveyor chain limit the various connected parts in the vertical direction, thereby ensuring that the entire lifting fixture clamps the blank in the correct posture. Further, the present application uses a transmission chain, and the bearing strength of the transmission chain is greater than that of the conveyor chain. The use of a transmission chain can ensure that the lifting fixture will not bend and deform due to gravity in the vertical direction.

[0037] A screw rod 8 is passed through the side of the clamping plate 6 close to the pressed blank. The screw rod 8 passes through the hole on the chain and is threadedly connected to the matching plate 7 that abuts the chain. The screw rod 8 clamps the clamping plate 6 on the inner side of the chain through its own screw head and the matching plate 7. The head of the screw rod 8 does not protrude from the inner side of the clamping plate 6 to prevent the head of the screw rod 8 from damaging the pressed blank. The clamping plate 6 is detachably connected to the chain through the screw rod 8, which is convenient for subsequent replacement of the clamping plate 6.

[0038] There is only one connection point between the clamping plate 6 and the chain. To ensure that the clamping plate 6 can be better fitted on the surface of the pressed blank, the best connection point is located in the middle of the chain. When there are multiple chains, there is only one connection point between the clamping plate 6 and the multiple chains, and the multiple connection points are aligned in the vertical direction.

[0039] The splint 6 can be a hard plate or an elastic plate. The hard plate needs to be customized according to the size of the pressed blank to fit the surface of the pressed blank, which is inconvenient. Therefore, it is preferred to use an elastic plate, which can be deformed and adjusted according to the size of the pressed blank, increasing the convenience of use. In addition, due to the setting method of the connection point between the splint 6 and the chain, the splint 6 can ensure the normal bending of the elastic plate after using an elastic plate. The material of the elastic plate can be one or more of polyurethane, polyvinyl chloride, nitrile rubber and EPDM rubber; in the present application, the height of the elastic plate is 70mm, the thickness is 5-6mm, and the length is 100-600mm. The size of the elastic plate can be selected according to demand, and the elastic plate is the only part of the entire lifting tooling that contacts the pressed blank.

[0040] A nut 4 is fixedly sleeved on the positive and negative thread stud 5 to facilitate the use of a wrench to clamp the nut 4 and rotate the positive and negative thread stud 5.

[0041] The connecting member 2 is connected with a lifting lug 1. The lifting lug 1 is arranged to cooperate with the lifting device 9 to lift the entire lifting tool and the pressed blank. The installation position of the lifting lug 1 can be selected according to the requirements. In the present application, only one lifting lug 1 is installed for the two connecting members 2 in a set of flexible components. The lifting lug 1 can be threadedly connected to the connecting member 2 so as to be installed on different connecting members 2 as required.

[0042] A method for lifting heavy rotary powder metallurgy compacts, using a lifting tool for lifting, the lifting method comprising the following steps:

[0043] S1. Calculate the length and quantity of the flexible components required according to the outer diameter of the pressed blank to be lifted, connect the flexible components end to end, and obtain a lifting tool that can be inserted into the pressed blank;

[0044] S2, put the lifting tooling onto the outer surface of the pressed blank, connect the lower end of the lifting tool 9 to the lifting ear 1, and connect the upper end of the lifting tool 9 to the crane hook;

[0045] S3, rotating the positive and negative thread studs 5, gradually reducing the inner diameter of the lifting tool and performing pre-lifting, observing whether the lifting tool has any movement phenomenon or trend relative to the pressed blank, if there is any movement phenomenon or trend, continue to reduce the inner diameter of the lifting tool, otherwise stop;

[0046] S4. Formal lifting, operate the crane, lift the pressed billet to the designated location, and then dismantle the tooling.

[0047] In step S3, when the pressed billet can be stably lifted, a torque wrench is used to rotate the forward and reverse wire studs 5 to test the torque exerted on the forward and reverse wire studs 5, and the torque magnitude and the weight of the pressed billet are recorded. This facilitates the next lifting. According to previous data, the torque wrench is directly used to tighten the forward and reverse wire studs 5 to the specified value, and then pre-lifting is performed, which reduces the number of pre-lifting times and improves lifting efficiency.

[0048] like Figure 3 As shown in FIG. 1 , since the clamping part of the lifting fixture for the green compact is located at the upper part of the green compact, the center of gravity of the green compact is below the lifting fixture, so at least two sets of flexible components are used; Figure 4 As shown, since the clamping part of the lifting fixture for the green compact is located in the lower middle part of the green compact, the center of gravity of the green compact is above the lifting fixture, and the green compact is at risk of tipping over, at least three sets of flexible components must be selected, and the lifting device 9 is gathered into one place above the green compact to ensure the stability of the lifting.

[0049] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A heavy-duty rotary powder metallurgy compact lifting tool, characterized in that: The invention comprises at least two groups of flexible components that embrace the pressed green sheet, wherein the flexible components include a flexible connector (3) and connectors (2) connected to both ends of the flexible connector (3); a clamping plate (6) is connected to the side of the flexible connector (3) close to the pressed green sheet, and positive and negative thread studs (5) are threadedly connected between two adjacent connectors (2).

2. The heavy-duty rotary powder metallurgy compact lifting tool according to claim 1, characterized in that: The flexible connecting member (3) is a connecting rope or a chain.

3. The heavy-duty rotary powder metallurgy compact lifting tool according to claim 2, characterized in that: The flexible connecting member (3) is a transmission chain or a conveying chain in the chain.

4. The heavy-duty rotary powder metallurgy compact lifting tool according to claim 3, characterized in that: A screw rod (8) penetrates through the side of the clamping plate (6) close to the pressed blank. The screw rod (8) passes through the holes on the chain and is threadedly connected to a matching plate (7) that abuts against the chain.

5. The heavy-duty rotary powder metallurgy compact lifting tool according to claim 4, characterized in that: The connection point between the clamping plate (6) and the chain is only arranged at one place.

6. The heavy-duty rotary powder metallurgy compact lifting tool according to claim 1, characterized in that: The clamping plate (6) is an elastic plate.

7. The heavy-duty rotary powder metallurgy compact lifting tool according to claim 1, characterized in that: A nut (4) is fixedly sleeved on the positive and negative thread studs (5).

8. The heavy-duty rotary powder metallurgy compact lifting tool according to claim 1, characterized in that: The connecting piece (2) is connected to a lifting lug (1).

9. A heavy rotary powder metallurgy compact lifting method, characterized in that: The lifting tool according to any one of claims 1 to 8 is used for lifting, and the lifting method comprises the following steps: S1. Calculate the length and quantity of the flexible components required according to the outer diameter of the pressed blank to be lifted, connect the flexible components end to end, and obtain a lifting tool that can be inserted into the pressed blank; S2, putting the lifting tooling onto the outer surface of the pressed blank, connecting the lower end of the lifting tool (9) to the lifting lug (1), and connecting the upper end of the lifting tool (9) to the crane hook; S3, rotating the positive and negative thread studs (5), gradually reducing the inner diameter of the lifting tool and performing pre-lifting, observing whether the lifting tool has any movement or tendency relative to the pressed blank, if there is any movement or tendency, continue to reduce the inner diameter of the lifting tool, otherwise stop; S4. Formal lifting, operate the crane, lift the pressed billet to the designated location, and then dismantle the tooling.

10. A heavy-duty rotary powder metallurgy compact lifting method according to claim 9, characterized in that: In the step S3, when the pressed blank can be stably lifted, a torque wrench is used to rotate the positive and negative thread studs (5) to test the torque applied to the positive and negative thread studs (5), and the torque magnitude and the weight of the pressed blank are recorded.

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