A welded counterweight for a beam pumping unit

Abstract

The utility model relates to a kind of welding type counterweight of beam-pumping unit, including core plate, fastening bolt hole and hoist hole, the core plate adopts steel plate material, the core plate includes first side wall surface, upper top surface, second side wall surface, left concave boss, right concave boss and rectangular connecting table, second side wall surface is round arc, first side wall surface is kiss joint with upper top surface by round arc side face, upper top surface is connected with second side wall surface, constitute half sector face shape, sector face lower part symmetrically connects left concave boss and right concave boss, the left concave boss and right concave boss are connected with rectangular connecting table, constitute integral core plate main body structure, several pieces of core plate main body are welded into whole, several hoist holes are equipped on core plate main body, fastening bolt hole is equipped on two ends of rectangular connecting table.The utility model is made by hot-rolled steel plate welding, avoid the fracture of bolt connection position caused by casting defect, prolong the life of lifting appliance;Balancing block is steel plate surface, and cutting surface around is covered with steel plate, and it is overall beautiful.

Description

Technical Field

[0001] This utility model belongs to the technical field of oil extraction equipment, and in particular relates to a welded balance block for a beam pumping unit. Background Technology

[0002] Beam pumping units are one of the main pieces of equipment for crude oil extraction in oil fields, and the vast majority require counterweights to be installed on the crankshaft. Currently, the counterweights used are all made of gray cast iron. See appendix for details. Figure 4 The balance block 8 is generally a semi-fan-shaped surface with two symmetrical concave-convex structures at the bottom, which are bolted to the crank of the pumping unit. The weight of the cast balance block is 1500kg, with the center of gravity at x=400, y=620, z=100. Several problems exist with the cast balance block: 1) Due to the large area and relatively small thickness of the balance block, uneven flow of molten iron occurs during casting, making the bolted connection to the crank a weak point. If a casting defect occurs here, it will break. Because welding repair of cast iron is complex, the entire balance block is scrapped; 2) The surface quality of large castings is difficult to guarantee, and casting defects are always present. Subsequent repair methods involve puttying; 3) Casting requires large equipment, countersinking of bolted connections is difficult, and machining the mating surface with the crank is costly; 4) The casting process is complex, has high environmental protection requirements, and the overall cost is high. Utility Model Content

[0003] This invention aims to overcome the shortcomings of existing technologies by providing a welded balance block for a beam pumping unit. It is manufactured using a hot-rolled plate welding process, eliminating the risk of breakage, reducing costs, improving surface quality, and facilitating repair.

[0004] To achieve the above objectives, this utility model provides a welded balance block for a beam pumping unit, comprising a core plate, fastening bolt holes, and lifting holes. The core plate includes a first side wall, a top surface, a second side wall, a left concave boss, a right concave boss, and a rectangular connecting platform. The second side wall is arc-shaped, and the first side wall is connected to the top surface via the arc side. The top surface and the second side wall are arc-shaped, forming a semi-fan-shaped surface. The lower part of the fan-shaped surface is symmetrically connected to the left and right concave bosses. The left and right concave bosses are connected to the rectangular connecting platform to form an integral core plate main structure. Several core plate main bodies are welded together. The core plate main body is provided with several lifting holes, and the rectangular connecting platform is provided with fastening bolt holes at both ends.

[0005] Preferably, the core board is made of A3 hot-rolled steel plate laser-cut into a plate with a thickness of 30~50mm.

[0006] Preferably, the core board body is fixedly connected to a side wall edging cover plate along its side surface.

[0007] Preferably, the core board body is composed of 4 to 6 core boards stacked and fixed together to form an integral structure.

[0008] Preferably, the core board body is stacked and fixed together using an intermittent welding method around the perimeter.

[0009] Preferably, a through sleeve for fastening bolt holes is fixedly connected inside the fastening bolt holes of the rectangular connecting platform.

[0010] Preferably, a steel sleeve is fixedly connected inside the lifting hole of the core plate body, and the two ends of the inner hole of the steel sleeve are provided with arc-shaped openings.

[0011] Preferably, the rectangular connecting platform of the core board body is provided with a crank connecting hole at its center. The crank connecting hole includes an arc platform and a bolt through hole. The arc platform is symmetrically placed on the upper and lower surfaces of the core board body, and the bolt through hole is located at the center of the arc platform.

[0012] Beneficial effects: Compared with the prior art, this utility model is made of hot-rolled steel plate by welding, which is easy to obtain, simple in process, short in production cycle, low in cost, and environmentally friendly; it avoids the breakage of bolt connection parts caused by casting defects; it extends the service life of the lifting equipment; the fastening bolts adopt a cover plate structure, which is simpler to process than the casting parts as a whole, and is safe and reliable; the dog tooth bolt holes are made of prefabricated steel sleeves by welding, which simplifies the processing technology; the balance block has steel plate surfaces on both sides, and the cut surfaces around the perimeter are covered with steel plates, which makes the overall appearance beautiful, greatly improves the surface quality, and facilitates subsequent anti-corrosion construction. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall design of this utility model; Figure 2 yes Figure 1 AA cross-section view; Figure 3 yes Figure 1 Schematic diagram of the core board structure; Figure 4 This is a schematic diagram of the structure of a gray cast iron balance block; Figure 5 This is a dimensional reference diagram of a gray cast iron balance block.

[0014] In the diagram: 1. Side wall edging cover plate; 2. Core plate; 2-1. First side wall surface; 2-2. Arc side surface; 2-3. Top surface; 2-4. Second side wall surface; 2-5. Left concave-convex platform; 2-6. Right concave-convex platform; 2-7. Rectangular connecting platform; 3. Lifting hole steel sleeve; 3-1. Arc opening; 4. Fastening bolt hole through sleeve; 5. Crank connecting hole; 5-1. Arc platform; 5-2. Bolt through hole; 6. Lifting hole; 7. Fastening bolt hole; 8. Cast balance block. Detailed Implementation

[0015] The following detailed description of the specific implementation method according to the present invention, in conjunction with preferred embodiments, is provided in detail below: Referring to the accompanying drawings, this embodiment provides a welded balance block for a beam pumping unit, including a core plate 2, fastening bolt holes 7, and lifting holes 6. The core plate includes a first side wall 2-1, a top surface 2-3, a second side wall 2-4, a left concave boss 2-5, a right concave boss 2-6, and a rectangular connecting platform 2-7. The second side wall is arc-shaped, and the first side wall is connected to the top surface via an arc-shaped side surface 2-2. The top surface and the second side wall are arc-shaped, forming a semi-fan-shaped surface. The lower part of the fan-shaped surface is symmetrically connected to the left and right concave bosses. The left and right concave bosses are connected to the rectangular connecting platform, forming an integral core plate main structure. Several core plate main bodies are welded together. The core plate main body is provided with several lifting holes 6, and the rectangular connecting platform has fastening bolt holes 7 at both ends. In this embodiment, the number of lifting holes is 3.

[0016] In a preferred embodiment, the core board is made of A3 hot-rolled steel plate laser-cut into a plate with a thickness of 40~50mm.

[0017] In a preferred embodiment, a sidewall edging cover plate 1 is fixedly attached to the side surface of the core board body. The cut surfaces around the core board are covered with steel plates. The sidewall edging cover plate is made of steel strips pre-pressed to have the same shape as the outer contour of the core board body. It is directly fitted onto the outer contour of the core board body and then welded along the outer contour, resulting in an aesthetically pleasing overall appearance.

[0018] In a preferred embodiment, the core board body is composed of 4 to 6 core boards stacked and fixed together to form an integral structure. This embodiment uses 5 core boards stacked and fixed together; the total thickness of the core board body is 200mm.

[0019] In this preferred embodiment, the core board body is stacked and fixed together, and then intermittent welding is used around the perimeter.

[0020] In a preferred embodiment, a through-hole sleeve 4 for fastening bolts is fixedly connected to the fastening bolt holes of the rectangular connecting platform. The two ends of the through-hole sleeve are welded to the rectangular connecting platform.

[0021] In a preferred embodiment, a steel sleeve 3 is fixedly connected inside the lifting hole of the core board body, and the two ends of the inner hole of the steel sleeve are provided with arc-shaped openings 3-1. The lifting hole is made of a prefabricated arc-shaped steel sleeve welded together, which effectively protects the wire rope and sling during hoisting and reduces the possibility of wire rope breakage or sling damage. After the steel sleeve 3 passes through the lifting hole of the multi-layer core board, its two ends are welded to the surface of the core board body. The steel sleeve 3 also serves as a positioning element when the multi-layer core boards are stacked.

[0022] In a preferred embodiment, the rectangular connecting platform of the core plate body has a crank connecting hole 5 at its center. The crank connecting hole includes an arc platform 5-1 and a bolt through hole 5-2. The arc platform is symmetrically positioned on the upper and lower surfaces of the core plate body, and the bolt through hole is located at the center of the arc platform. A bolt sleeve is fixedly connected within the bolt through hole. The crank connecting hole 5 is used to connect with the dogtooth connecting plate of the crank. (The dogtooth connecting plate is a common term in the oilfield extraction industry and is not directly related to the structure of this utility model, so it will not be described further.) The crank connecting hole in this embodiment is 80mm thick. Specific construction process A 30-50mm thick sheet is laser-cut into the main shape of the balance block, called the core plate. Depending on the weight requirements, 4-6 core plates are stacked and welded together, using intermittent welding around the perimeter. Pre-fabricated, machined, arc-shaped steel sleeves penetrating the stacked steel plates are welded at the three lifting holes. Pre-fabricated, machined bolt sleeves are welded below. The bolt hole through-sleeves are welded to rectangular connecting platforms at both ends, and connected to cranks via bolts. The cut edges around the core plate are covered with side cover plates and welded together as a whole.

[0023] Key points of this utility model: 1) The balance block is made of hot-rolled steel plate by welding; 2) The structures on the balance block that require machining, such as lifting holes, crank connection holes, and fastening bolt holes, are made of prefabricated welded structures; 3) The cut surfaces around the balance block are covered by side-wall edging plates made of steel strips by pre-pressing.

[0024] The above detailed description of a welded balance block for a beam pumping unit, with reference to the embodiments, is illustrative rather than limiting. Several embodiments can be listed according to the defined scope. Therefore, changes and modifications without departing from the overall concept of this utility model should be within the protection scope of this utility model.

Claims

1. A welded counterweight for a beam pumping unit, characterized in that: The system includes a core plate, fastening bolt holes, and lifting holes. The core plate is made of steel plate and includes a first side wall, a top surface, a second side wall, a left concave boss, a right concave boss, and a rectangular connecting platform. The second side wall is arc-shaped, and the first side wall is connected to the top surface through the arc side. The top surface and the second side wall are arc-shaped, forming a half-fan shape. The lower part of the fan-shaped surface is symmetrically connected to the left and right concave bosses. The left and right concave bosses are connected to the rectangular connecting platform to form the overall core plate main structure. Several core plate main bodies are welded together. The core plate main body is provided with several lifting holes, and the rectangular connecting platform has fastening bolt holes at both ends.

2. The welded balance block of the beam pumping unit according to claim 1, characterized in that: The core board is made of A3 hot-rolled steel plate laser-cut into a thickness of 30~50mm.

3. The welded balance block of the beam pumping unit according to claim 1, characterized in that: The core board body is fixedly connected to a side wall edge cover plate along its side surface.

4. The welded counterweight of the beam pumping unit according to claim 1 or 3, characterized in that: The core board body is composed of 4 to 6 core boards stacked and fixed together to form an integral structure.

5. The welded balance block of the beam pumping unit according to claim 4, characterized in that: The core board body is stacked and fixed together, and then intermittent welding is used around the perimeter.

6. The welded balance block of the beam pumping unit according to claim 1, characterized in that: A through-hole sleeve for fastening bolts is fixedly connected inside the fastening bolt hole of the rectangular connecting platform.

7. The welded balance block of the beam pumping unit according to claim 1, characterized in that: A steel sleeve is fixedly connected inside the lifting hole of the core board body, and the two ends of the inner hole of the steel sleeve are provided with arc-shaped openings.

8. The welded balance block of the beam pumping unit according to claim 1, characterized in that: The rectangular connecting platform of the core board body has a crank connecting hole at its center. The crank connecting hole includes an arc platform and a bolt through hole. The arc platform is symmetrically placed on the upper and lower surfaces of the core board body, and the bolt through hole is located at the center of the arc platform.

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