Casting device for driven wheel of petroleum pumping unit

Abstract

The invention discloses a petroleum pumping unit driven wheel casting device, and belongs to the technical field of casting, the petroleum pumping unit driven wheel casting device comprises a lower die, six annularly distributed middle hole columns are fixedly connected in the lower die, an upper die is arranged above the lower die, and the upper die comprises an outer die base, a profiling metal inner die, an alignment hole shell and a center pouring shell. The forming cavity is gradually filled with molten metal through the center pouring shell, the multiple extrusion columns move downwards at the same time to downwards press and transfer pressure to the profiling metal inner mold, the molten metal moves in the area inside the forming cavity to be mixed with the molten metal entering in sequence, and the bottom of the profiling metal inner mold deformed under stress is shaped through the profiling cold iron base. And meanwhile, the upper layer parts of the connecting ribs and the connecting area of the inner ring and the outer ring are completely covered, the outer edge parts of the through holes in the narrow parts of the connecting ribs are covered with the six hole area cold iron blocks, the component connecting areas and the through hole parts of the driven wheel casting are effectively and sequentially solidified within similar time, and isolated hot spots of the connecting areas are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of casting, in particular to a casting device for a driven wheel of a petroleum pumping unit. Background Art

[0002] The driven wheel of the oil pumping unit is a transmission part used to connect the power machine on the oil pumping unit. The driven wheel of the oil pumping unit is mass-produced by metal casting. The molten metal is injected into the molding cavity in the mold from the gate on the upper part of the metal mold. The molten metals that enter successively are mixed inside the molding cavity to raise the liquid level of the molten metal, so that the molten metal gradually fills the molding cavity and is cooled and solidified in the metal mold to form the driven wheel casting of the oil pumping unit. The inner and outer rings of the driven wheel are connected by the middle connecting rib. The meat thickness of the outer and inner ring structures of the driven wheel is thicker, and the meat thickness of the middle connecting rib is less than that of the inner and outer rings of the driven wheel, so that the inner and outer parts of the middle connecting rib connecting the inner and outer rings are lower than the inner and outer rings of the driven wheel. Due to the problems of splicing position and uneven meat thickness, the connection parts of the middle connecting rib and the inner and outer rings of the driven wheel are prone to multiple isolated heat nodes in different positions in the connection area between the inner and outer rings and the middle connecting rib, which makes it impossible for the inner and outer ring connection areas of the driven wheel casting and the through-hole parts on the connecting rib to be effectively solidified sequentially, resulting in multiple cooling differences in the connection area, which is prone to cause multiple shrinkage defects in the connection area and the outer edge of the narrow through-hole of the middle connecting rib itself, affecting the casting effect of the driven wheel of the oil pumping unit. Summary of the invention

[0003] In order to overcome the above-mentioned defects of the prior art, the present invention provides a casting device for a driven wheel of an oil pumping unit, wherein an upper mold is arranged to be molded together with a cooling mold to the top of a lower mold, and the molten metal gradually fills the molding cavity through a central casting shell, and a plurality of extrusion columns simultaneously move downward to transfer pressure to a profiling metal inner mold, and the bottom portion of the profiling metal inner mold is deformed to impact the molten metal in the molding cavity from the connection area between the connecting rib and the outer ring of the driven wheel, so that the molten metal is effectively moved in the molding cavity to mix the molten metal that enters successively, and the profiling cold iron seat and the six hole area cold iron blocks descend to be clamped on the bottom of the profiling metal inner mold and the inside of the six positioning hole shells, so that the profiling cold iron seat completes the shaping of the bottom portion of the profiling metal inner mold that is deformed by force, and at the same time completely covers the upper layer of the connecting rib and the inner and outer ring connecting area, and the six hole area cold iron blocks cover the outer edge portion of the narrow through hole of the connecting rib itself, so that the component connection area and the through hole portion of the driven wheel casting are effectively solidified sequentially at a similar time, reducing the isolated heat nodes in the connection area, so as to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions: A casting device for a driven wheel of an oil pumping unit, comprising a lower die, six central hole columns distributed in an annular manner are fixedly connected inside the lower die, an upper die is arranged above the lower die, the upper die comprises an outer die seat, a profiled metal inner die, a counter-hole shell and a central casting shell, the outer die seat, the profiled metal inner die and the central casting shell are fixed in sequence from the outside to the inside, the number of the counter-hole shells is six, and the six counter-hole shells are molded on the outside of the six central hole columns through the profiled metal inner die; a cooling die is arranged above the upper die, the cooling die It includes a top plate, a contoured cold iron seat, a spliced ​​bottom plate and a cold iron block in the hole area. The contoured cold iron seat moves inside the contoured metal inner mold. There are six cold iron blocks in the hole area, which are clamped on the bottom of the top plate through the spliced ​​bottom plate. A movable extrusion module is provided above the cooling mold. The movable extrusion module includes a combination ring and an extrusion column. There are six extrusion columns, which move inside the top plate and the contoured cold iron seat through the combination ring to transfer pressure to the contoured metal inner mold.

[0005] Furthermore, the outer mold base is snap-connected to the top of the lower mold, the contoured metal inner mold is fixedly connected to the inner wall of the outer mold base, the central casting shell is fixedly connected to the inner wall of the contoured metal inner mold, and the bottom end of the central casting shell is clamped at the center position of the inner wall of the lower mold.

[0006] Furthermore, the six alignment hole shells are fixedly connected to the bottom of the contoured metal inner mold in an annular shape, and the alignment hole shells are snap-connected in the offset space between the corresponding middle hole column and the lower mold.

[0007] Furthermore, the contoured cold iron seat is snap-connected to the inside of the contoured metal inner mold, and a column is fixedly connected to the top of the contoured cold iron seat, and the column is inserted into the inside of the top plate.

[0008] Furthermore, the spliced ​​bottom plate is snap-connected to the bottom of the contoured cold iron seat, and the six hole area cold iron blocks are annularly plugged and fixed to the bottom of the spliced ​​bottom plate.

[0009] Furthermore, the contoured cold iron seat and the bottom of the spliced ​​base plate are both tightly attached to the inner side wall of the contoured metal inner mold, the hole area cold iron block is snap-connected to the inside of the corresponding positioning hole shell, and the bottom of the hole area cold iron block is tightly attached to the top of the corresponding middle hole column.

[0010] Furthermore, the combination ring is located above the cooling mold, and the six extrusion columns are fixedly connected to the bottom of the combination ring in a ring shape.

[0011] Furthermore, the extrusion column is inserted into the top plate, a vertical guide groove corresponding to the extrusion column is provided inside the contoured cold iron seat, and the extrusion column is engaged and connected with the vertical guide groove.

[0012] Furthermore, the extrusion column and the vertical guide groove are both located in the connection area between the outer ring of the driven wheel and the connecting rib, and the splicing bottom plate is located on the inner side of the extrusion column.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The present invention forms a molding cavity adapted to the driven wheel casting of the oil pumping unit by arranging an upper mold with a cooling mold to be molded together with the top of the lower mold. The metal liquid gradually fills the molding cavity through the central pouring shell. By operating the combined ring, multiple extrusion columns can be simultaneously moved downward to transfer pressure to the profiling metal inner mold. The bottom part of the profiling metal inner mold is deformed to apply force to the metal liquid in the molding cavity from the connecting area of ​​the connecting rib and the outer ring of the driven wheel, effectively promoting the regional movement of the metal liquid inside the molding cavity to mix the metal liquids that enter successively. The profiling cold iron seat and the cold iron blocks in the six hole areas are together in the profiling metal inner mold. The lower part of the mold is lowered, which can effectively clamp the profiling chiller seat and the six hole area chillers on the bottom of the profiling metal inner mold and the inside of the six matching hole shells, so that the profiling chiller seat can complete the shaping of the bottom part of the profiling metal inner mold that is deformed by force, and at the same time completely cover the upper part of the connecting rib and the inner and outer ring connecting area. The six hole area chillers cover the outer edge of the narrow through hole of the connecting rib itself, which can effectively solidify the component connection area and the through hole part of the driven wheel casting in sequence at a similar time, reduce the cooling difference in the connection area, reduce the isolated heat nodes in the connection area, and improve the casting effect of the driven wheel of the oil pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solution in the embodiment, the drawings in the embodiment are briefly introduced below.

[0015] Figure 1 It is a product structure diagram of the existing oil pump driven wheel casting; Figure 2 It is a structural schematic diagram of the present invention; Figure 3 It is a schematic diagram of the cross-sectional structure of the present invention from the side; Figure 4 It is a schematic diagram of the top view of the structure of the present invention; In the figure: 1. lower mold; 11. middle hole column; 2. upper mold; 21. outer mold base; 22. contoured metal inner mold; 23. alignment hole shell; 24. center casting shell; 3. cooling mold; 31. top plate; 32. contoured cold iron base; 321. column; 322. vertical guide groove; 33. splicing bottom plate; 34. hole area cold iron block; 4. movable extrusion module; 41. combination ring; 42. extrusion column. DETAILED DESCRIPTION

[0016] The following is a clear and complete description of the technical solution in the embodiment of the present invention in conjunction with the accompanying drawings in the embodiment of the present invention. Figures 1 to 4 The detailed description of the structure will clearly show that the structural contents mentioned in the following embodiments are all based on the drawings in the specification.

[0017] See also Figure 1 to Figure 4 In an embodiment of the present invention, a casting device for a driven wheel of a petroleum pumping unit includes a lower mold 1, six central hole columns 11 distributed in an annular manner are fixedly connected inside the lower mold 1, an upper mold 2 is arranged above the lower mold 1, and the upper mold 2 includes an outer mold base 21, a contoured metal inner mold 22, a positioning hole shell 23 and a central casting shell 24. The outer mold base 21, the contoured metal inner mold 22 and the central casting shell 24 are fixed in sequence from the outside to the inside. The number of the positioning hole shells 23 is six, and the six positioning hole shells 23 are molded on the outside of the six central hole columns 11 through the contoured metal inner mold 22. A cooling mold 3 is arranged above the upper mold 2. The cooling mold 3 is provided on the upper mold 2. The cooling mold 3 includes a top plate 31, a contoured cold iron seat 32, a spliced ​​bottom plate 33 and a hole area cold iron block 34. The contoured cold iron seat 32 is movable inside the contoured metal inner mold 22. There are six hole area cold iron blocks 34, which are clamped at the bottom of the top plate 31 through the spliced ​​bottom plate 33. A movable extrusion module 4 is provided above the cooling mold 3. The movable extrusion module 4 includes a combination ring 41 and an extrusion column 42. There are six extrusion columns 42, which are movable inside the top plate 31 and the contoured cold iron seat 32 through the combination ring 41 to transfer pressure to the contoured metal inner mold 22.

[0018] The lower mold 1 and the upper mold 2 are combined to form a metal casting mold for the driven wheel of the oil pumping unit. Six middle hole columns 11 are arranged inside the lower mold 1. The six middle hole columns 11 are fixedly connected to the inner wall of the lower mold 1 in a ring shape. The six middle hole columns 11 correspond to the six through-hole positions on the middle connecting rib of the driven wheel of the oil pumping unit to ensure that the through holes on the middle connecting rib are effectively formed during casting.

[0019] The upper mold 2 is composed of an outer mold base 21, a contoured metal inner mold 22, a positioning hole shell 23 and a center casting shell 24. The contoured metal inner mold 22 is fixedly connected to the inner side wall of the outer mold base 21, and the center casting shell 24 is fixedly connected to the inner side wall of the contoured metal inner mold 22, so that the outer mold base 21, the contoured metal inner mold 22 and the center casting shell 24 are stably fixed together from the outside to the inside. There are six positioning hole shells 23, which are fixedly connected to the bottom of the contoured metal inner mold 22 in an annular shape. The positioning hole shells 23 are clamped and connected in the offset space between the corresponding middle hole column 11 and the lower mold 1, so that the six positioning hole shells 23 can gradually descend to clamp on the outside of the six middle hole columns 11 when the upper mold 2 is closed on the top of the lower mold 1. The outer mold base 21 is snap-fitted and connected to the top of the lower mold 1, and the upper mold 2 is stably clamped on the top of the lower mold 1 as a whole, so that the upper mold 2 and the lower mold 1 cooperate to form a molding cavity that is integrally adapted to the driven wheel casting of the oil pumping unit. The bottom end of the central casting shell 24 is clamped at the center position of the inner wall of the lower mold 1, so that the bottom gate of the central casting shell 24 is exposed inside the lower mold 1, so as to effectively pour molten metal into the molding cavity through the central casting shell 24.

[0020] The cooling mold 3 is arranged above the upper mold 2. The cooling mold 3 is composed of a top plate 31, a profiling cold iron seat 32, a splicing bottom plate 33 and a hole area cold iron block 34. The profiling cold iron seat 32 is snap-connected to the inside of the profiling metal inner mold 22. The outer wall of the profiling cold iron seat 32 is close to the inner side wall of the profiling metal inner mold 22, so that the profiling cold iron seat 32 moves inside the profiling metal inner mold 22. A column 321 is fixedly connected to the top of the profiling cold iron seat 32. The column 321 is plugged into the top plate 31. The column 321 can move vertically inside the top plate 31 to control the profiling cold iron seat 32 to move vertically inside the profiling metal inner mold 22 against the inner side wall of the profiling metal inner mold 22, so as to facilitate the adjustment of the position of the profiling cold iron seat 32 inside the profiling metal inner mold 22. The profiling cold iron seat 32 is clamped and positioned inside the profiling metal inner mold 22, and the top plate 31 can be positioned above the outer mold seat 21 and the profiling metal inner mold 22 through the upper column 321. At the same time, the top plate 31 can be lowered on the top of the outer mold seat 21 to clamp and position the top plate 31 on the top of the outer mold seat 21, and the cooling mold 3 can be stably closed to the top of the upper mold 2. The splicing bottom plate 33 is clamped and connected to the bottom of the profiling cold iron seat 32, and the number of the hole area cold iron blocks 34 is six. The six hole area cold iron blocks 34 are annularly plugged and fixed at the bottom of the splicing bottom plate 33, so that the six hole area cold iron blocks 34 are stably clamped and positioned at the designated position at the bottom of the top plate 31 through the splicing bottom plate 33. The six hole area cold iron blocks 34 correspond to the six alignment hole shells 23, so that after the cooling mold 3 is closed to the top of the upper mold 2, the six hole area cold iron blocks 34 can enter the alignment hole shell 23 from the top, so that the hole area cold iron blocks 34 are clamped and positioned inside the corresponding alignment hole shell 23, effectively positioning the hole area cold iron blocks 34 at the designated position in the forming cavity. The bottom of the hole area cold iron block 34 is tightly attached to the top of the corresponding middle hole column 11, and the hole area cold iron block 34 and the corresponding middle hole column 11 can be spliced. At the same time, the outer wall of the hole area cold iron block 34 is tightly attached to the inner wall of the alignment hole shell 23, achieving the effect of supporting and shaping the alignment hole shell 23 from the inside of the alignment hole shell 23, so as to ensure the formation of a fully adapted forming cavity. The bottom of the splicing bottom plate 33 is in an inclined state to effectively adapt to the inner side wall of the profiling metal inner mold 22, so that the splicing bottom plate 33 can be tightly positioned on the inner side wall of the profiling metal inner mold 22. The splicing bottom plate 33 splices the profiling cold iron seat 32 to ensure the rotation of the profiling cold iron seat 32 inside the profiling metal inner mold 22.

[0021] The movable extrusion module 4 is connected to the cooling mold 3. The movable extrusion module 4 is composed of a combination ring 41 and an extrusion column 42. The combination ring 41 is located above the cooling mold 3. There are six extrusion columns 42, and the six extrusion columns 42 are fixedly connected to the bottom of the combination ring 41 in a ring shape. The extrusion column 42 is inserted into the top plate 31, so that the extrusion column 42 can move vertically inside the top plate 31. A vertical guide groove 322 corresponding to the extrusion column 42 is provided inside the profiling cold iron seat 32. The extrusion column 42 is engaged with the vertical guide groove 322. The extrusion column 42 that moves vertically can enter downward into the vertical guide groove 322 at the corresponding position on the profiling cold iron seat 32, so that the six extrusion columns 42 can stably move vertically inside the top plate 31 and the profiling cold iron seat 32 through the combination ring 41, and adjust the position of the extrusion column 42 inside the profiling metal inner mold 22. The downward movement of the extrusion column 42 inside the vertical guide groove 322 can allow the bottom end of the extrusion column 42 to contact the bottom area of ​​the contoured metal inner mold 22. The extrusion column 42 can press down to transfer pressure to the contoured metal inner mold 22, achieving the effect of causing the bottom area of ​​the contoured metal inner mold 22 to be deformed by force. The extrusion column 42 and the vertical guide groove 322 are both located in the connection area between the outer ring of the driven wheel and the connecting rib, which can cause the contoured metal inner mold 22 to be deformed by force from a specified position, so as to directly transfer pressure from the connection area to force the molten metal in the connection area, thereby improving the mixing effect of the molten metal that enters each area successively. The splicing bottom plate 33 is located on the inner side of the extrusion column 42 to ensure that the extrusion column 42 does not contact the splicing bottom plate 33 when it moves.

[0022] The lower mold 1, the upper mold 2 and the cooling mold 3 are closed in sequence, and the upper mold 2 and the cooling mold 3 are closed together to the top of the lower mold 1 to form a molding cavity adapted to the driven wheel casting of the pumping unit. The molten metal is poured into the molding cavity from the central pouring shell 24 in the middle position, and the liquid level of the molten metal gradually rises inside the molding cavity to fill the molding cavity. The combination ring 41 is pressed down, so that the combination ring 41 pushes multiple extrusion columns 42 to move down at the same time. The extrusion columns 42 move down from the inside of the top plate 31 into the inside of the profiled cold iron seat 32, and continue to move down inside the profiled cold iron seat 32 to the profiled metal inner mold 22. The pressure is transmitted to the profiled metal inner mold 22 by pressing down the extrusion columns 42. The bottom part of the profiled metal inner mold 22 is deformed to apply force to the molten metal in the molding cavity from the connection area between the connecting rib and the outer ring of the driven wheel, effectively moving the molten metal in the molding cavity to mix the molten metal that enters successively. The profiling cold iron seat 32 and the six hole area cold iron blocks 34 are lowered inside the profiling metal inner mold 22, so that the profiling cold iron seat 32 and the six hole area cold iron blocks 34 can be effectively clamped on the bottom of the profiling metal inner mold 22 and the inside of the six positioning hole shells 23, so that the profiling cold iron seat 32 can complete the shaping of the bottom part of the profiling metal inner mold 22 that is deformed by force. The bottoms of the profiling cold iron seat 32 and the splicing bottom plate 33 are both close to the inner side wall of the profiling metal inner mold 22, and can completely cover the upper part of the connecting ribs and the inner and outer ring connecting areas. The six hole area cold iron blocks 34 cover the outer edge of the narrow through holes of the connecting ribs themselves, so that the component connection area and the through hole part of the driven wheel casting can be effectively solidified in sequence at a similar time, reducing the cooling difference in the connection area, reducing the isolated heat nodes in the connection area, and improving the casting effect of the driven wheel of the pumping unit.

[0023] The working principle of the present invention is as follows: the upper mold 2 is molded together with the cooling mold 3 to the top of the lower mold 1, and a molding cavity for molten metal to enter is formed between the lower mold 1 and the upper mold 2. The molten metal is poured into the molding cavity from the central pouring shell 24 in the middle position. The liquid level of the molten metal gradually rises inside the molding cavity to fill the molding cavity. The combined ring 41 is pressed down to allow the combined ring 41 to push multiple extrusion columns 42 to move downward at the same time. The extrusion columns 42 move downward from the inside of the top plate 31 to enter the inside of the profiling cold iron seat 32. The extrusion columns 42 continue to move downward to the profiling metal inner mold 22 and transfer pressure to the profiling metal inner mold 22, so that the bottom of the profiling metal inner mold 22 is deformed to impact the molten metal in the molding cavity from the connection area between the connecting rib and the outer ring of the driven wheel, so that the molten metal is regionally active and mixed and enters successively. The molten metal is lowered inside the profiling metal inner mold 22 together with the six hole area cold iron blocks 34 by operating the column 321, and the profiling cold iron seat 32 is clamped at the bottom of the profiling metal inner mold 22, and the bottom part of the profiling metal inner mold 22 that is deformed by force is shaped from the outside, and the six hole area cold iron blocks 34 are clamped inside the six positioning hole shells 23. The profiling cold iron seat 32 completely covers the upper part of the connecting rib and the inner and outer ring connecting area, and the six hole area cold iron blocks 34 cover the outer edge part of the narrow through hole of the connecting rib itself, so that the component connection area and the through hole part of the driven wheel casting are sequentially solidified at a similar time. After cooling and solidification, the upper mold 2 is removed from the top of the lower mold 1, and then the formed driven wheel casting of the oil pump is taken out from the inside of the lower mold 1.

[0024] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A casting device for a driven wheel of a petroleum pumping unit, comprising a lower die (1), wherein six middle hole columns (11) distributed in an annular shape are fixedly connected inside the lower die (1), characterized in that: An upper mold (2) is provided above the lower mold (1), the upper mold (2) comprising an outer mold base (21), a contoured metal inner mold (22), a positioning hole shell (23) and a central casting shell (24), the outer mold base (21), the contoured metal inner mold (22) and the central casting shell (24) are fixed in sequence from the outside to the inside, the number of the positioning hole shells (23) is six, and the six positioning hole shells (23) are molded on the outside of the six middle hole columns (11) through the contoured metal inner mold (22); A cooling mold (3) is provided above the upper mold (2), and the cooling mold (3) comprises a top plate (31), a contoured cold iron seat (32), a spliced ​​bottom plate (33) and a hole area cold iron block (34), wherein the contoured cold iron seat (32) moves inside the contoured metal inner mold (22), and the number of the hole area cold iron blocks (34) is six, and the six hole area cold iron blocks (34) are clamped to the bottom of the top plate (31) through the spliced ​​bottom plate (33); A movable extrusion module (4) is provided above the cooling mold (3), and the movable extrusion module (4) comprises a combination ring (41) and extrusion columns (42). The number of the extrusion columns (42) is six, and the six extrusion columns (42) are movable through the combination ring (41) within the top plate (31) and the contoured cold iron seat (32) to transfer pressure to the contoured metal inner mold (22) by downward pressure.

2. The casting device for the driven wheel of a petroleum pumping unit according to claim 1, characterized in that: The outer mold base (21) is snap-connected to the top of the lower mold (1), the contoured metal inner mold (22) is fixedly connected to the inner wall of the outer mold base (21), the central casting shell (24) is fixedly connected to the inner wall of the contoured metal inner mold (22), and the bottom end of the central casting shell (24) is snap-connected to the center position of the inner wall of the lower mold (1).

3. The casting device for the driven wheel of a petroleum pumping unit according to claim 1, characterized in that: The six alignment hole shells (23) are fixedly connected to the bottom of the contoured metal inner mold (22) in an annular shape, and the alignment hole shells (23) are snap-fitted and connected in the offset space between the corresponding middle hole column (11) and the lower mold (1).

4. The casting device for the driven wheel of a petroleum pumping unit according to claim 1, characterized in that: The contoured cold iron seat (32) is snap-connected inside the contoured metal inner mold (22), a column (321) is fixedly connected to the top of the contoured cold iron seat (32), and the column (321) is inserted into the top plate (31).

5. The casting device for the driven wheel of a petroleum pumping unit according to claim 1, characterized in that: The splicing bottom plate (33) is snap-connected to the bottom of the contoured cold iron seat (32), and the six hole area cold iron blocks (34) are annularly plugged and fixed to the bottom of the splicing bottom plate (33).

6. The casting device for the driven wheel of a petroleum pumping unit according to claim 1, characterized in that: The bottoms of the contoured cold iron seat (32) and the spliced ​​bottom plate (33) are both in close contact with the inner wall of the contoured metal inner mold (22); the hole area cold iron block (34) is snap-fitted and connected to the inside of the corresponding alignment hole shell (23); and the bottom of the hole area cold iron block (34) is in close contact with the top of the corresponding middle hole column (11).

7. The casting device for a driven wheel of a petroleum pumping unit according to claim 1, characterized in that: The combined ring (41) is located above the cooling mold (3), and the six extrusion columns (42) are fixedly connected to the bottom of the combined ring (41) in a ring shape.

8. The casting device for the driven wheel of a petroleum pumping unit according to claim 1, characterized in that: The extrusion column (42) is inserted into the top plate (31), a vertical guide groove (322) corresponding to the extrusion column (42) is provided inside the contoured cold iron seat (32), and the extrusion column (42) is engaged and connected with the vertical guide groove (322).

9. The casting device for the driven wheel of a petroleum pumping unit according to claim 8, characterized in that: The extrusion column (42) and the vertical guide groove (322) are both located in the connection area between the outer ring of the driven wheel and the connection rib, and the splicing bottom plate (33) is located on the inner side of the extrusion column (42).

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