Combined sand core holder for valve body casting

Abstract

This utility model relates to the field of valve body casting technology, and in particular to a combined sand core fixing frame for valve body casting. It includes a fixing ring seat with an annular groove on its bottom surface. A fixing disk is rotatably connected to the inner side of the fixing ring seat. A first through-hole array and a second through-hole array are both formed on the inner side of the fixing disk. The slot structures of the first and second slot arrays are staggered along the radial direction of the fixing disk. An exhaust frame is positioned below the fixing disk, covering both the first and second slot arrays. An exhaust pipe is positioned below the exhaust frame. This utility model, through a rotatable fixing disk and staggered slot arrays, allows for rapid adjustment of the exhaust path according to the sand core model, covering different exhaust hole positions. This effectively solves the air resistance problem caused by the fixed exhaust path in traditional fixing frames, reduces the porosity defect rate of castings, and improves the stability during valve casting.

Description

Technical Field

[0001] This utility model relates to the field of valve body casting technology, and in particular to a combined sand core fixing frame for valve body casting. Background Technology

[0002] Valve body casting is one of the key processes in the mechanical manufacturing field, and its quality directly affects the sealing performance and service life of the valve body. In the valve body casting process, the sand core, as the core component that forms the internal cavity structure of the valve body, has its fixing and venting effects as the core factors that determine the quality of the casting. Traditional sand core fixing frames usually adopt a fixed structure, and the sand core is positioned in the casting mold by mechanical clamping or bolt fixing.

[0003] However, existing sand core holders have significant drawbacks. Their venting structure is usually a single channel or straight groove in a fixed position, which cannot meet the venting requirements of different types of sand cores. Due to the complex structure of the valve body, the venting hole position of the sand core varies with the model. The fixed venting path of the traditional holder can easily cause gas to stagnate inside the sand core, forming gas resistance, which in turn leads to defects such as surface porosity and internal looseness of the casting, resulting in a high scrap rate.

[0004] Therefore, to address the above problems, a combined sand core fixing frame for valve body casting is proposed. Through a rotatable fixing plate and an array of staggered slots, the exhaust path can be quickly adjusted according to the sand core model, covering different exhaust hole positions. This effectively solves the air resistance problem caused by the fixed exhaust path of traditional fixing frames, reduces the porosity defect rate of castings, and improves the stability of valve casting processing. Utility Model Content

[0005] In order to overcome the problems that exist in the daily use of traditional valve body casting sand core fixing frames, the venting structure is usually a single channel or straight groove in a fixed position, which cannot meet the venting requirements of different types of sand cores. At the same time, due to the complex structure of the valve body, the venting hole position of the sand core varies with the model. The fixed venting path of the traditional fixing frame is prone to causing gas to stagnate inside the sand core, forming air resistance, which in turn causes defects such as surface porosity and internal looseness of the casting, resulting in a high scrap rate.

[0006] The technical solution of this utility model is as follows: a combined sand core fixing frame for valve body casting, including a fixing ring seat, an annular groove on the bottom surface of the fixing ring seat, a fixing disk rotatably connected to the inner side of the fixing ring seat, a first slot array penetrating vertically on the inner side of the fixing disk, a second slot array penetrating vertically on the inner side of the fixing disk, the slot structures of the first slot array and the second slot array being staggered along the radial position of the fixing disk, an exhaust frame being provided below the fixing disk, the exhaust frame covering the first slot array and the second slot array, an exhaust pipe being provided below the exhaust frame, a first connecting frame being provided below the fixing disk, a first threaded pipe being provided below the first connecting frame, a first threaded rod being threadedly connected to the inner side of the first threaded pipe, and a friction block being provided at one end of the first threaded rod.

[0007] Preferably, the positions of the first and second slot arrays are adjusted by rotating the fixed disk. Since the slot structures of the first and second slot arrays are staggered along the radial position of the fixed disk, when the fixed disk rotates, the slot structures of the first and second slot arrays can cover most of the position on the fixed disk. Thus, the vent holes of the sand core and a set of slot structures in the slot array can be aligned by rotating the fixed disk. By rotating the first threaded rod, the first threaded rod moves up and down along the first threaded tube, embedding the friction block into the annular groove and pressing it tightly against the inner wall of the annular groove to fix the fixed disk. During casting, the gas in the sand core is discharged through the slot array along the vent frame and vent pipe, preventing gas from stagnating inside the sand core and causing gas resistance. At the same time, the stable fixed disk structure can provide stable support for the sand core while flexibly adjusting the vent path to adapt to different types of sand core structures, improving the stability of valve casting and processing.

[0008] Preferably, a plurality of fixing blocks are provided on one side of the fixing ring seat, and a second threaded tube is provided on one side of the fixing blocks.

[0009] Preferably, a second threaded rod is provided on the inner side of the second threaded tube, which penetrates the fixing block, and the second threaded rod and the second threaded tube are threaded together.

[0010] Preferably, a bearing is provided at one end of the second threaded rod, and a clamping block is provided on one side of the bearing.

[0011] Preferably, a limiting rod is slidably connected to the inner side of the fixing block, one end of the limiting rod is connected to the clamping block, and a flexible clamping pad is provided on one side of the clamping block.

[0012] Preferably, a second connecting frame is provided above the clamping block, and a third threaded pipe is provided above the second connecting frame.

[0013] Preferably, the inner thread of the third threaded tube is connected to a third threaded rod, and a pressure block is provided at the lower end of the third threaded rod.

[0014] The beneficial effects of this utility model are:

[0015] The positions of the first and second slot arrays are adjusted by rotating the fixed disk. Since the slot structures of the first and second slot arrays are staggered along the radial position of the fixed disk, the slot structures of the first and second slot arrays can cover most of the position on the fixed disk when the fixed disk rotates. Thus, the vent holes of the sand core and a set of slot structures in the slot array can be aligned by rotating the fixed disk. By rotating the first threaded rod, the first threaded rod moves up and down along the first threaded tube, embedding the friction block into the annular groove and pressing it tightly against the inner wall of the annular groove to fix the fixed disk. During casting, the gas in the sand core is discharged through the slot array along the vent frame and vent pipe, preventing gas from stagnating inside the sand core and causing gas resistance. At the same time, the stable fixed disk structure can provide stable support for the sand core while flexibly adjusting the vent path to adapt to different types of sand core structures, improving the stability of valve casting and processing. Attached Figure Description

[0016] Figure 1 The diagram shown is a first three-dimensional structural schematic of the combined sand core fixing frame for valve body casting of this utility model.

[0017] Figure 2 The diagram shown is a second three-dimensional structural schematic of the combined sand core fixing frame for valve body casting of this utility model.

[0018] Figure 3 The diagram shown is a first cross-sectional view of the combined sand core fixing frame for valve body casting of this utility model.

[0019] Figure 4 The diagram shown is a second cross-sectional view of the combined sand core fixing frame for valve body casting of this utility model.

[0020] Explanation of reference numerals in the attached drawings: 1. Fixed ring seat; 2. Annular groove; 101. Fixed disc; 103. First slot array; 104. Second slot array; 105. Exhaust frame; 106. Exhaust pipe; 107. First connecting frame; 108. First threaded pipe; 109. First threaded rod; 110. Friction block; 201. Fixed block; 202. Second threaded pipe; 203. Second threaded rod; 204. Bearing; 205. Clamping block; 206. Limiting rod; 207. Flexible clamping pad; 301. Second connecting frame; 302. Third threaded pipe; 303. Third threaded rod; 304. Pressure block. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Please see Figure 1 and Figure 2This utility model provides an embodiment: a combined sand core fixing frame for valve body casting, including a fixing ring seat 1, an annular groove 2 on the bottom surface of the fixing ring seat 1, a fixing disk 101 rotatably connected to the inner side of the fixing ring seat 1, a first slot array 103 penetrating vertically on the inner side of the fixing disk 101, and a second slot array 104 penetrating vertically on the inner side of the fixing disk 101. The slot structures of the first slot array 103 and the second slot array 104 are staggered along the radial position of the fixing disk 101. Below the fixed plate 101, an exhaust bracket 105 is provided, covering the first slot array 103 and the second slot array 104. An exhaust pipe 106 is provided below the exhaust bracket 105. Below the fixed plate 101, a first connecting bracket 107 is provided, and below the first connecting bracket 107, a first threaded pipe 108 is provided. A first threaded rod 109 is threadedly connected to the inner side of the first threaded pipe 108. One end of the first threaded rod 109 is provided with a friction block 110. The first slot array is adjusted by rotating the fixed plate 101. The positions of column 103 and the second slot array 104 are such that, since the slot structures of the first slot array 103 and the second slot array 104 are staggered along the radial position of the fixed disk 101, when the fixed disk 101 rotates, the slot structures of the first slot array 103 and the second slot array 104 can cover most of the position on the fixed disk 101. Thus, by rotating the fixed disk 101, the vent hole of the sand core and a set of slot structures in the slot array can be aligned. By rotating the first threaded rod 109, the first threaded rod 109 is moved up and down along the first threaded tube 108, and the friction block 110 is embedded in the annular groove 2 and closely attached to the inner wall of the annular groove 2 to fix the fixed disk 101. During casting, the gas in the sand core is discharged through the slot array along the vent frame 105 and the vent pipe 106 to prevent the gas inside the sand core from stagnating and causing gas resistance. At the same time, the stable fixed disk 101 structure can provide stable support for the sand core while flexibly adjusting the vent path to adapt to different types of sand core structures.

[0023] Please see Figure 3 and Figure 4In this embodiment, a plurality of fixing blocks 201 are provided on one side of the fixing ring seat 1. A second threaded tube 202 is provided on one side of the fixing block 201. A second threaded rod 203 is provided inside the second threaded tube 202, penetrating the fixing block 201. The second threaded rod 203 and the second threaded tube 202 are threadedly connected. A bearing 204 is provided at one end of the second threaded rod 203. A clamping block 205 is provided on one side of the bearing 204. A limit rod 206 is slidably connected to the inside of the fixing block 201. One end of the limit rod 206 is connected to the clamping block 205. A flexible clamping pad 207 is provided on one side of the clamping block 205. In use, by rotating the second threaded rod 203, the second threaded rod 203 moves linearly along the second threaded tube 202, thereby driving the clamping block 205 to move linearly. The limit rod 206 limits the linear movement path of the clamping block 205. The linear movement of the multiple sets of clamping blocks 205 causes the multiple sets of flexible clamping pads 207 to clamp and fix the sand core workpiece.

[0024] A second connecting frame 301 is provided above the clamping block 205, and a third threaded tube 302 is provided above the second connecting frame 301. A third threaded rod 303 is threadedly connected to the inner side of the third threaded tube 302. A pressure block 304 is provided at the lower end of the third threaded rod 303. In use, by rotating the third threaded rod 303, the third threaded rod 303 moves up and down along the third threaded tube 302, thereby driving the pressure block 304 to move up and down, so that the pressure block 304 and the sand core workpiece on the fixing plate 101 are pressed and fixed.

[0025] During operation, the fixed disk 101 is first rotated relative to the fixed ring seat 1 according to the position of the vent hole of the sand core to be cast. Since the slot structure of the first slot array 103 and the second slot array 104 on the fixed disk 101 is radially staggered, the two sets of slot arrays can cover most of the surface area of ​​the fixed disk 101 during rotation. When a set of slot arrays is aligned with the vent hole of the sand core, the fixed disk 101 is stopped from rotating, and the first threaded rod 109 is rotated to move upward along the first threaded tube 108, causing the friction block 110 to be embedded in the annular groove 2 on the bottom surface of the fixed ring seat 1 and to be in close contact with the groove wall. At this time, the friction between the friction block 110 and the annular groove 2 firmly locks the fixed disk 101, ensuring that the vent path is accurately connected to the vent hole of the sand core, and avoiding the formation of gas resistance due to gas stagnation inside the sand core during casting.

[0026] After placing the sand core above the fixed plate 101, the second threaded rods 203 on each fixed block 201 are rotated sequentially. When the second threaded rods 203 move linearly along the second threaded tube 202, they push the clamping blocks 205 closer to the outer wall of the sand core through the bearings 204. At the same time, the limiting rods 206 slide within the fixed blocks 201 to guide the movement path of the clamping blocks 205 and prevent deviation. When the flexible clamping pads 207 of multiple sets of clamping blocks 205 simultaneously contact the outer wall of the sand core, the rotation of the second threaded rods 203 is stopped. At this time, the flexible clamping pads 207 conform to the surface of the sand core through elastic deformation, achieving uniform circumferential clamping, avoiding damage to the sand core caused by hard contact, and ensuring that the sand core will not be misaligned due to shaking during the casting process.

[0027] After circumferential clamping is completed, the third threaded rod 303 above each clamping block 205 is rotated in sequence. When the third threaded rod 303 moves downward along the third threaded tube 302, it drives the pressure block 304 to move downward synchronously until the bottom of the pressure block 304 contacts the top surface of the sand core and applies appropriate pressure. At this time, the pressure block 304 and the flexible clamping pad 207 of the clamping block 205 form a coordinated upper and lower fixing structure. The pressure block 304 prevents the sand core from moving upward, and the clamping block 205 prevents the sand core from swaying horizontally. This further improves the stability of the sand core during the casting process and ensures that it always maintains a precise alignment with the venting path.

[0028] Through the above steps, the positions of the first slot array 103 and the second slot array 104 are adjusted by rotating the fixed disk 101. Since the slot structures of the first slot array 103 and the second slot array 104 are staggered along the radial position of the fixed disk 101, when the fixed disk 101 rotates, the slot structures of the first slot array 103 and the second slot array 104 can cover most of the position on the fixed disk 101. Therefore, the venting holes of the sand core and a group of slots in the slot array can be connected by rotating the fixed disk 101. The components are aligned, and the first threaded rod 109 is rotated to move up and down along the first threaded tube 108, so that the friction block 110 is embedded in the annular groove 2 and closely adheres to the inner wall of the annular groove 2 to fix the fixed plate 101. During casting, the gas in the sand core is discharged through the slot array along the exhaust frame 105 and the exhaust pipe 106 to prevent the gas inside the sand core from stagnating and causing gas resistance. At the same time, the stable fixed plate 101 structure can provide stable support for the sand core while flexibly adjusting the exhaust path to adapt to different types of sand core structures, thereby improving the stability of valve casting and processing.

[0029] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A combined sand core fixing frame for valve body casting, comprising a fixing ring seat (1), characterized in that: An annular groove (2) is provided on the bottom surface of the fixed ring seat (1). A fixed disk (101) is rotatably connected to the inner side of the fixed ring seat (1). A first slot array (103) is provided on the inner side of the fixed disk (101) and a second slot array (104) is provided on the inner side of the fixed disk (101) and the slot structures of the first slot array (103) and the second slot array (104) are staggered along the radial position of the fixed disk (101). An exhaust rack is provided below the fixed disk (101). (105) The exhaust frame (105) covers the first slot array (103) and the second slot array (104). An exhaust pipe (106) is provided below the exhaust frame (105). A first connecting frame (107) is provided below the fixed plate (101). A first threaded pipe (108) is provided below the first connecting frame (107). A first threaded rod (109) is threadedly connected to the inner side of the first threaded pipe (108). A friction block (110) is provided at one end of the first threaded rod (109).

2. The combined sand core fixing frame for valve body casting according to claim 1, characterized in that: A number of fixing blocks (201) are provided on one side of the fixing ring seat (1), and a second threaded pipe (202) is provided on one side of the fixing block (201).

3. The combined sand core fixing frame for valve body casting according to claim 2, characterized in that: The inner side of the second threaded tube (202) is provided with a second threaded rod (203) that penetrates the fixing block (201), and the second threaded rod (203) is threadedly connected to the second threaded tube (202).

4. The combined sand core fixing frame for valve body casting according to claim 3, characterized in that: A bearing (204) is provided at one end of the second threaded rod (203), and a clamping block (205) is provided on one side of the bearing (204).

5. The combined sand core fixing frame for valve body casting according to claim 4, characterized in that: A limiting rod (206) is slidably connected to the inner side of the fixing block (201). One end of the limiting rod (206) is connected to the clamping block (205). A flexible clamping pad (207) is provided on one side of the clamping block (205).

6. The combined sand core fixing frame for valve body casting according to claim 4, characterized in that: A second connecting frame (301) is provided above the clamping block (205), and a third threaded pipe (302) is provided above the second connecting frame (301).

7. The combined sand core fixing frame for valve body casting according to claim 6, characterized in that: The inner thread of the third threaded tube (302) is connected to a third threaded rod (303), and a pressure block (304) is provided at the lower end of the third threaded rod (303).

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