Casting mold for upper crown of pumped storage water turbine

Abstract

The utility model relates to the technical field of water turbine machining, in particular to a pumped storage water turbine crown casting mold which comprises a base, a lower mold and an assisting assembly, the lower mold is installed on the upper surface of the base, an upper mold is installed on the upper surface of the lower mold, and the assisting assembly is arranged on the surface of the base; the auxiliary assembly comprises a driving unit, the driving unit comprises a supporting frame, the supporting frame is fixedly connected with the side surface of the base, reinforcing ribs are fixedly connected to the side surface of the supporting frame, a mounting frame is fixedly connected to the upper surface of the supporting frame, and a servo motor is fixedly connected to the side surface of the mounting frame. According to the utility model, the assisting component is arranged, so that the casting mold can discharge gas in a knocking manner, the problem that the mold is damaged due to structural fatigue when the casting mold is driven by virtue of a meshing tooth structure is solved, and the machining effect and the stability of the mold are further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of water turbine processing, in particular to a casting mould for a crown of a pumped storage water turbine. Background Art

[0002] The turbine crown is one of the important parts of the turbine. It is usually located on the upper part of the turbine runner and together with the lower ring constitutes the overall structure of the runner. The shape and design of the crown have a significant impact on the performance of the turbine. Its functions include guiding water flow, reducing energy loss, and ensuring the stability and balanced operation of the runner. High-quality crown materials can withstand the impact of high-speed water flow and long-term wear. In different types of turbines, the structure and characteristics of the crown will be different. For example, the crown of a mixed flow turbine is more complex in shape, while the crown of an axial flow turbine has a unique structure. In short, the turbine crown plays a key role in the efficient and stable operation of the turbine.

[0003] Prior art includes an invention patent with publication number CN112264596B, which discloses a pouring device for a thin-walled conical turbine crown casting. The patent adopts a base; a group of rotating drive parts are fixedly connected to the right side of the base; a group of upper mold plates are slidably connected to the upper part of the base; a group of follower bevel gears are rotatably connected to the left and right sides of the upper mold plate; a group of upper rotating transmission shafts are rotatably connected to the inside of the upper mold plate; the present invention can realize the rotation of the mold, and the molten steel flows outward under the action of centrifugal force, reducing the accumulation of bubbles on the outer surface, reducing the probability of defects such as pores and pinholes on the surface of the workpiece, ensuring good product quality, simple to use, easy to operate, and solving the problem that the existing casting device is generally a fixed mold, and casting is performed by gravity during use. During casting, bubbles are easily retained on the outer surface of the casting, causing casting defects such as pores and pinholes, affecting product quality, and affecting the service life of the turbine crown.

[0004] In the process of casting the upper crown of the turbine with the help of a casting mold, there is an existing casting device such as the above-mentioned one, which drives the casting mold to rotate by using a screw and other structures as a driving mechanism, aiming to reduce the generation of bubbles in the casting mold. However, a large amount of molten steel will be poured into the casting mold during casting. Once the molten steel fills the mold, the weight of the mold itself will increase significantly, thereby greatly increasing the load on the driving mechanism. When the driving mechanism relies on structures such as meshing teeth for a long time to drive, the meshing teeth are prone to fatigue. During long-term use, this fatigue will cause the meshing teeth to deform, which will cause damage and failure of the equipment and mold, making it impossible to work normally, resulting in stagnation of production in the enterprise. Utility Model Content

[0005] The purpose of the utility model is to solve the problem in the prior art that when the driving mechanism relies on structures such as meshing teeth for a long time to perform driving operations, the meshing teeth are prone to fatigue. During long-term use, this fatigue will cause the meshing teeth to deform, thereby causing damage to the equipment and molds, making it impossible to work normally, resulting in stagnation of enterprise production. A pumped-storage turbine crown casting mold is proposed to solve the problem.

[0006] In order to achieve the above-mentioned object, the utility model adopts the following technical scheme: a pumped storage turbine upper crown casting mold, comprising a base, a lower mold and an auxiliary component, the lower mold is installed on the upper surface of the base, the upper surface of the lower mold is installed with an upper mold, and the auxiliary component is arranged on the surface of the base;

[0007] The assisting assembly comprises a driving unit, the driving unit comprises a supporting frame, the supporting frame is fixedly connected to the side surface of the base, the side surface of the supporting frame is fixedly connected with a reinforcing rib, the upper surface of the supporting frame is fixedly connected with a mounting frame, the side surface of the mounting frame is fixedly connected with a servo motor, the driving end of the servo motor is rotatably connected with a rotating shaft, the surface of the rotating shaft is bolted with a cam, the inner wall of the mounting frame is fixedly connected with a limiting sleeve, and the limiting sleeve abuts against the side surface of the cam;

[0008] The assisting component also includes a knocking unit, which includes a positioning frame, the positioning frame is fixedly connected to the upper surface of the base, a limit pin is inserted into the inner wall of the positioning frame, a fixing bolt is threadedly connected to the inner wall of the positioning frame, an insertion hole is opened on the arc surface of the limit pin, the fixing bolt is plugged into the inner wall of the insertion hole, a connecting sleeve is sleeved on the surface of the limit pin, a connecting arm is fixedly connected to the side surface of the connecting sleeve, a knocking block is fixedly connected to the inclined surface of the connecting arm, and the knocking block abuts against the arc surface of the upper mold.

[0009] Preferably, there are two support frames, which are disposed symmetrically about the base. The support frames can support and limit the mounting frame, thereby ensuring that the mounting frame can position the servo motor within the designed area.

[0010] Preferably, the number of the reinforcing ribs is two, and the two reinforcing ribs are symmetrically arranged front and back about the support frame. The reinforcing ribs can increase the structural strength of the turning part of the support frame to improve the supporting load of the support frame.

[0011] Preferably, the rotating shaft passes through the side surface of the cam, and the limiting sleeve is sleeved with the surface of the rotating shaft. Through the cooperation between the rotating shaft and the servo motor, the cam can be driven to rotate when the servo motor is powered on.

[0012] Preferably, the cam is located on one side of the connecting arm, and the cam is adapted to the connecting arm. The cam in the rotating state can push the connecting arm to rotate, and the pressure applied to the connecting arm can be released after leaving, so that the connecting arm can be rotated and reset under the weight of the knocking block.

[0013] Preferably, the number of the limit pins is two, and the two limit pins are symmetrically arranged front and back about the connecting arm. The number of the connecting sleeves matches the limit pins, and the limit pins can cooperate with the limit sleeves to support and limit the position of the connecting arm.

[0014] Compared with the prior art, the advantages and positive effects of the utility model are:

[0015] In the utility model, by setting an assisting component, during processing, the upper mold is installed above the lower mold, and then molten steel is injected into the mold through the pouring port reserved in the upper mold. After the molten steel is cooled, the upper mold can be removed and the workpiece can be taken out. While pouring the molten steel, the servo motor is turned on, the servo motor drives the rotating shaft, and the rotating shaft drives the cam to rotate. The cam gradually approaches the connecting arm from the top during rotation. When the cam contacts the connecting arm, the cam pushes the connecting arm. Under the guidance of the connecting sleeve and the limit pin, the connecting arm lifts the knocking block. When the cam rotates away from the connecting arm, the connecting arm loses the pressure applied by the cam, and under the action of the weight of the knocking block, it is guided to rotate by the limit pin and the connecting sleeve. At the same time, the knocking block knocks on the surface of the upper mold under the guidance of the connecting arm, thereby causing the mold to vibrate and vibrate out the gas in the mold. By setting the assisting component, the casting mold can discharge gas by knocking, thereby reducing the problem of mold damage caused by structural fatigue caused by driving with the help of the meshing structure, and further improving the processing effect and stability of the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The utility model provides a three-dimensional structural schematic diagram of a pumped storage turbine upper crown casting mold;

[0017] Figure 2 The utility model proposes a pumped storage turbine crown casting mold Figure 1 Schematic diagram of the structure at A in the middle;

[0018] Figure 3 The utility model provides a schematic diagram of the structure of a pumped storage turbine upper crown casting mold in a bottom view;

[0019] Figure 4 The utility model provides a schematic diagram of the structure of an auxiliary component of a pumped storage turbine crown casting mold;

[0020] Figure 5 The utility model proposes a pumped storage turbine crown casting mold Figure 4 Schematic diagram of the structure at point B in the middle.

[0021] Legend:

[0022] 1. Base; 2. Lower mold; 3. Upper mold; 4. Assisting assembly; 41. Driving unit; 411. Support frame; 412. Reinforcing rib; 413. Mounting frame; 414. Servo motor; 415. Rotating shaft; 416. Cam; 417. Limiting sleeve; 42. Striking unit; 421. Positioning frame; 422. Limiting pin; 423. Fixing bolt; 424. Connecting sleeve; 425. Connecting arm; 426. Striking block. DETAILED DESCRIPTION

[0023] See also Figure 1-Figure 5 The utility model provides a technical solution: a pumped storage turbine upper crown casting mold, comprising a base 1, a lower mold 2 and an auxiliary component 4, the lower mold 2 is installed on the upper surface of the base 1, the upper surface of the lower mold 2 is installed with an upper mold 3, and the auxiliary component 4 is arranged on the surface of the base 1.

[0024] In this embodiment: the assisting assembly 4 includes a driving unit 41, the driving unit 41 includes a supporting frame 411, the supporting frame 411 is fixedly connected to the side surface of the base 1, the side surface of the supporting frame 411 is fixedly connected to a reinforcing rib 412, the upper surface of the supporting frame 411 is fixedly connected to a mounting frame 413, the side surface of the mounting frame 413 is fixedly connected to a servo motor 414, the driving end of the servo motor 414 is rotatably connected to a rotating shaft 415, the surface of the rotating shaft 415 is bolted with a cam 416, the inner wall of the mounting frame 413 is fixedly connected to a limiting sleeve 417, and the limiting sleeve 417 abuts against the side surface of the cam 416;

[0025] The assisting component 4 also includes a knocking unit 42, which includes a positioning frame 421, which is fixedly connected to the upper surface of the base 1, a limiting pin 422 is inserted into the inner wall of the positioning frame 421, and a fixing bolt 423 is threadedly connected to the inner wall of the positioning frame 421. A socket is provided on the arc surface of the limiting pin 422, and the fixing bolt 423 is plugged into the inner wall of the socket. A connecting sleeve 424 is sleeved on the surface of the limiting pin 422, and a connecting arm 425 is fixedly connected to the side surface of the connecting sleeve 424. A knocking block 426 is fixedly connected to the inclined surface of the connecting arm 425, and the knocking block 426 is in contact with the arc surface of the upper mold 3.

[0026] Specifically, there are two support frames 411 , and the two support frames 411 are disposed symmetrically with respect to the base 1 .

[0027] In this embodiment: the support frame 411 can support and limit the mounting frame 413, thereby ensuring that the mounting frame 413 can set the position of the servo motor 414 in the designed area.

[0028] Specifically, there are two reinforcing ribs 412 , which are symmetrically arranged front and back about the support frame 411 . The reinforcing ribs 412 can increase the structural strength of the turning part of the support frame 411 to improve the supporting load of the support frame 411 .

[0029] In this embodiment, the rotating shaft 415 passes through the side surface of the cam 416 , and the limiting sleeve 417 is sleeved with the surface of the rotating shaft 415 .

[0030] In this embodiment, through the cooperation between the rotating shaft 415 and the servo motor 414, the cam 416 can be driven to rotate when the servo motor 414 is powered on.

[0031] Specifically, the cam 416 is located on one side of the connecting arm 425, and the cam 416 is adapted to the connecting arm 425. The cam 416 in the rotating state can push the connecting arm 425 to rotate, and the pressure applied to the connecting arm 425 can be released after leaving, so that the connecting arm 425 can be rotated and reset under the weight of the knocking block 426.

[0032] Specifically, there are two limit pins 422 , which are symmetrically arranged front and back about the connecting arm 425 , and the number of the connecting sleeves 424 matches the limit pins 422 .

[0033] In this embodiment, the position of the connecting arm 425 can be supported and limited by the cooperation between the limiting pin 422 and the limiting sleeve 417 .

[0034] Working principle: During processing, the upper mold 3 is installed above the lower mold 2, and molten steel is then injected into the mold through the reserved pouring port of the upper mold 3. After the molten steel is cooled, the upper mold 3 can be removed and the workpiece can be taken out; while pouring the molten steel, the servo motor 414 is turned on, the servo motor 414 drives the rotating shaft 415, and the rotating shaft 415 drives the cam 416 to rotate. The cam 416 gradually approaches the connecting arm 425 from the top during rotation. When the cam 416 contacts the connecting arm 425, the cam 416 pushes the connecting arm 425, and the connecting arm 425 is guided by the connecting sleeve 424 and the limit pin 422, and the force is applied to lift the knocking block 426 When the cam 416 rotates away from the connecting arm 425, the connecting arm 425 loses the pressure applied by the cam 416, and under the action of the weight of the knocking block 426, it is guided to rotate by the limit pin 422 and the connecting sleeve 424. At the same time, the knocking block 426, under the guidance of the connecting arm 425, knocks on the surface of the upper mold 3, thereby causing the mold to vibrate and shake out the gas in the mold. By setting up the auxiliary component 4, the casting mold can discharge gas by knocking, thereby reducing the problem of mold damage caused by structural fatigue due to driving with the help of the meshing structure, and further improving the processing effect and stability of the mold.

Claims

1. A pumped storage turbine crown casting mold, comprising a base (1), a lower mold (2) and an auxiliary component (4), characterized in that: The lower mold (2) is mounted on the upper surface of the base (1), an upper mold (3) is mounted on the upper surface of the lower mold (2), and the assisting component (4) is arranged on the surface of the base (1); The assisting component (4) comprises a driving unit (41), wherein the driving unit (41) comprises a supporting frame (411), wherein the supporting frame (411) is fixedly connected to a side surface of the base (1), wherein a reinforcing rib (412) is fixedly connected to the side surface of the supporting frame (411), wherein a mounting frame (413) is fixedly connected to the upper surface of the supporting frame (411), wherein a servo motor (414) is fixedly connected to the side surface of the mounting frame (413), wherein a driving end of the servo motor (414) is rotatably connected to a rotating shaft (415), wherein a cam (416) is bolted to the surface of the rotating shaft (415), and wherein a limiting sleeve (417) is fixedly connected to the inner wall of the mounting frame (413), wherein the limiting sleeve (417) abuts against the side surface of the cam (416); The assisting assembly (4) further comprises a knocking unit (42), wherein the knocking unit (42) comprises a positioning frame (421), wherein the positioning frame (421) is fixedly connected to the upper surface of the base (1), wherein a limiting pin (422) is inserted into the inner wall of the positioning frame (421), wherein a fixing bolt (423) is threadedly connected to the inner wall of the positioning frame (421), wherein an insertion hole is provided on the arc surface of the limiting pin (422), wherein the fixing bolt (423) is plugged into the inner wall of the insertion hole, wherein a connecting sleeve (424) is sleeved on the surface of the limiting pin (422), wherein a connecting arm (425) is fixedly connected to the side surface of the connecting sleeve (424), wherein a knocking block (426) is fixedly connected to the inclined surface of the connecting arm (425), wherein the knocking block (426) abuts against the arc surface of the upper mold (3).

2. A pumped storage turbine crown casting mold according to claim 1, characterized in that: The number of the support frames (411) is two, and the two support frames (411) are arranged in a left-right symmetrical manner with respect to the base (1).

3. A pumped storage turbine crown casting mold according to claim 1, characterized in that: The number of the reinforcing ribs (412) is two, and the two reinforcing ribs (412) are arranged front-to-back symmetrically with respect to the support frame (411).

4. A pumped storage turbine crown casting mold according to claim 1, characterized in that: The rotating shaft (415) passes through the side surface of the cam (416), and the limiting sleeve (417) is sleeved with the surface of the rotating shaft (415).

5. The pumped storage turbine crown casting mold according to claim 1, characterized in that: The cam (416) is located on one side of the connecting arm (425), and the cam (416) is adapted to the connecting arm (425).

6. A pumped storage turbine crown casting mold according to claim 1, characterized in that: The number of the limit pins (422) is two, and the two limit pins (422) are symmetrically arranged front and back about the connecting arm (425), and the number of the connecting sleeves (424) matches the limit pins (422).

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