Precoated sand combined core for agricultural machine belt pulley production

Abstract

The invention discloses a precoated sand combined core for agricultural machine belt pulley production, and relates to the field of casting parts, the precoated sand combined core comprises an external core, an internal mold core is mounted in the external core, a casting is poured between the external core and the internal mold core, a cross gate is arranged at the end part of the external core, and the cross gate is communicated with a sprue and an ingate; a heat preservation riser is arranged in the inner mold core, an exhaust needle is arranged in the heat preservation riser, pouring molten iron flows through the sprue, the cross gate and the edge pressing ingate, the pouring molten iron enters a casting mold cavity, feeding is conducted through the heat preservation riser, and feeding of independent hot knots near a bearing hole of the middle bearing is achieved. The groove is formed in the outer core-spun inner ring, so that integral groove casting of the belt pulley can be achieved, secondary groove machining is not needed, and compared with a traditional casting process, the technology has the advantages that the process yield is increased, the internal quality is improved, the rejection rate is reduced, the machining time is shortened, the machining efficiency is improved, and the blank cleaning difficulty is reduced.

Description

Technical Field

[0001] The invention relates to the field of castings, and in particular to a coated sand composite core for producing agricultural machinery pulleys. Background Art

[0002] With the popularization and rapid development of modern agricultural mechanization, the demand for cast iron parts in agricultural machinery is also regarded as one of the markets with the greatest development potential. Among them, well-known German brand agricultural machinery has been operating in China for more than 10 years and is widely popular in the Chinese market. It continues to invest in R&D and production technology to improve product quality and performance to better meet customer needs. In the transmission mechanism of agricultural machinery, the pulley, as a key component, must have good mechanical bearing performance and dense internal quality, high dimensional accuracy, and double-sided balance to ensure stable and efficient operation. Among them, the coated sand composite core is an optimized casting core designed to improve the utilization rate of liquid metal and work efficiency.

[0003] The following problems still exist in the existing pulley casting process: during the existing pulley casting process, the groove of the outer ring of the pulley cannot be cast together, and the groove needs to be produced by subsequent pulley processing, which increases the casting cost and reduces the overall casting efficiency.

[0004] Therefore, it is necessary to invent a coated sand composite core for producing agricultural machinery pulleys to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a coated sand composite core for the production of agricultural machinery pulleys, so as to solve the problem raised in the above background technology that during the casting process of the existing pulley, the groove of the outer ring of the pulley cannot be cast together, and the groove needs to be produced by subsequent pulley processing, which leads to increased casting costs and low overall casting efficiency.

[0006] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a coated sand composite core for agricultural machinery pulley production, comprising an external core, an internal core is installed inside the external core, a casting is cast between the external core and the internal core, a cross runner is arranged at the end of the external core, and the cross runner is connected with the straight runner and the ingode, an insulation riser is arranged inside the internal core, and an exhaust needle is arranged in the insulation riser, and the molten iron is poured through the sprue, flows through the cross runner and the edge pressure ingode, and the molten iron enters the casting cavity, and the shrinkage is compensated by the insulation riser to achieve the shrinkage compensation of the independent heat junction near the bearing hole of the intermediate bearing, and the cavity is exhausted by the exhaust needle to complete the casting work, and also includes: The buckle installation assembly, the outer walls of the two groups of the outer cores are fixedly connected with blocks, and the outer wall of one side of the blocks is fixedly connected with a mounting block, and the mounting block matches the mounting groove provided inside the other opposite block, and the mounting groove is movably connected with a mounting clamp inside, and the mounting clamp matches the mounting block, so that the two groups of the outer cores can be buckled and installed, which is convenient for the pouring work; The linkage assembly comprises a rotating shaft rotatably connected to the interior of the block through a bearing, and the rotating shaft is fixedly connected to the toggle rod, the rotating shaft is fixedly connected to the circular plate, and the circular plate and the mounting fixture are transmission-connected through a universal shaft.

[0007] Preferably, the external core is provided in two groups, and the two groups of external core form a closed casting cavity, and blocks are fixedly connected on both sides of the incision of each group of external core, and the outer walls of the blocks fixedly connected to the outer walls of the two groups of external core fit together, so that the two groups of external core can be matched and installed through two relative blocks to facilitate the smooth implementation of the casting work.

[0008] Preferably, the inner ring of the outer core is provided with a groove with strict outer diameter accuracy requirements, so that the integral groove of the pulley can be cast without the need for secondary groove processing.

[0009] Preferably, the two sides of the mounting block are serrated, and the serrations on both sides of the mounting block match the serration blocks on the outer wall of the mounting card, which facilitates the stability of the connection when the mounting block matches the mounting groove, thereby ensuring the firmness of the two sets of external core-wrapped buckle installation.

[0010] Preferably, both side walls of the installation fixture are fixedly connected with limiting blocks to ensure the stability of the installation fixture, and the limiting blocks move inside the limiting groove along with the installation fixture, and the limiting groove is connected with the installation groove; The two installation clamps are a group of symmetrically arranged inside the installation groove, so that the two groups of installation clamps are matched with the sawtooth blocks on both sides of the installation block to ensure the firmness of the installation.

[0011] Preferably, the toggle lever is in a "C" shape, and the rod bodies at both ends of the toggle lever are integrally installed with the ends of the rotating shaft rotatably connected to the upper and lower ends of the block through bearings. In the process of toggling the toggle lever, the rotation of the rotating shaft fixedly connected to the two ends of the toggle lever can drive the movement of the two sets of mounting clips.

[0012] Preferably, the outer ring of the rotating shaft is movably sleeved with a torsion spring, and the two ends of the torsion spring are respectively fixedly connected to the inner wall of the mounting groove and the circular plate. In the initial state, the force applied by the torsion spring causes the circular plate to be located at a specific angle, so that the mounting clip that is movably connected to the circular plate through the universal shaft matches the side serrations of the mounting block at this distance.

[0013] Preferably, the circular plate and the mounting fixture are respectively provided with a notch 1 and a notch 2, there is a deviation in the linear positions of the notch 1 and the notch 2, and the inner walls of the notch 1 and the notch 2 are fixedly connected with a connecting rod 2, and the connecting rod 1 and the connecting rod 2 are movably connected through a universal shaft, so that when the circular plate rotates, the end positions of the universal shaft and the circular plate that realize the universal connection change, and the universal shaft as a whole moves around the position of the short rod 2 as the center of the circle, and at this time, the mounting fixture in the limited movement moves inside the mounting groove under the action of the universal shaft movement.

[0014] In the above technical solution, the technical effects and advantages provided by the present invention are: The present invention pours molten iron through the sprue, flows through the cross runner and the edge pressure ingrown, enters the casting cavity, and realizes the shrinkage compensation of the independent heat junction near the bearing hole of the intermediate bearing through the heat preservation riser, and realizes the cavity exhaust through the exhaust needle to complete the casting work. At the same time, the inner ring of the outer core is provided with a groove, so that the overall groove of the pulley can be cast without the need for secondary groove processing. Compared with the traditional casting process, this technology improves the process yield, improves the internal quality, reduces the scrap rate, shortens the processing time, improves the processing efficiency, and reduces the difficulty of blank cleaning; The toggle lever drives the rotation of the rotating shaft fixedly connected thereto, thereby driving the circular plate to rotate. Under the transmission action of the universal shaft, the circular plate rotates and moves against the mounting clamp through the universal shaft. When the movement of the mounting clamp does not match the mounting block, the two sets of external cores can be separated, which is convenient for taking out the casting. The overall operation is convenient and quick. When the subsequent mounting clamp matches the mounting block, the two sets of external cores can also be ensured to be tightly connected. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0016] Figure 1 It is a schematic plan view of the overall structure of the present invention; Figure 2 It is a three-dimensional diagram of the internal structure of the outer core (partially cut away) of the present invention; Figure 3 It is an exploded view of the connection structure between the outer core (partially cut away) and the casting of the present invention; Figure 4 It is a three-dimensional diagram of the internal structure of the block (partially cut away) of the present invention; Figure 5 For the present invention Figure 4Schematic diagram of the structure magnification effect at A in the middle; Figure 6 It is a three-dimensional diagram of the internal structure of the block (partially cut away) of the present invention.

[0017] Description of reference numerals: 1. Sprue; 2. Insulated riser; 3. Runner; 4. Inner runner; 5. Casting; 6. Internal core; 7. Exhaust needle; 8. External core; 9. Snap-fit ​​installation assembly; 91. Block; 92. Mounting block; 93. Mounting slot; 94. Mounting clip; 941. Limit block; 942. Limit slot; 10. Linkage assembly; 101. Toggle rod; 102. Rotating shaft; 103. Round plate; 104. Notch one; 105. Connecting rod one; 106. Notch two; 107. Connecting rod two; 108. Universal joint. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0019] The present invention provides Figure 1-6 The coated sand composite core for the production of agricultural machinery pulleys shown in the figure comprises an external core 8, an internal core 6 is installed inside the external core 8, a casting 5 is cast between the external core 8 and the internal core 6, a cross runner 3 is arranged at the end of the external core 8, and the cross runner 3 is connected with the straight runner 1 and the ingode 4, an insulation riser 2 is arranged inside the internal core 6, and an exhaust needle 7 is arranged in the insulation riser 2, the molten iron is poured through the sprue 1, flows through the cross runner 3 and the edge pressure ingode 4, the molten iron is poured into the casting 5 cavity, and the shrinkage is compensated through the insulation riser 2, the shrinkage compensation of the independent heat junction near the bearing hole of the intermediate bearing is realized, and the cavity is exhausted through the exhaust needle 7, and the casting work is completed, and it also includes: The buckle installation assembly 9, the outer walls of the two groups of external cores 8 are fixedly connected with blocks 91, and the outer wall of one side of the blocks 91 is fixedly connected with a mounting block 92, and the mounting block 92 matches the mounting groove 93 provided inside the other opposite block 91, and the mounting groove 93 is movably connected with a mounting clamp 94 inside, and the mounting clamp 94 matches the mounting block 92, so that the two groups of external cores 8 can be buckled and installed, which is convenient for the pouring work; In the linkage assembly 10 , a rotating shaft 102 is rotatably connected to the interior of the block 91 via a bearing, and the rotating shaft 102 is fixedly connected to the toggle rod 101 , and the rotating shaft 102 is fixedly connected to the circular plate 103 , and the circular plate 103 is transmission-connected to the mounting fixture 94 via a universal shaft 108 .

[0020] There are two groups of external core packages 8, and the two groups of external core packages 8 form a closed casting cavity, and blocks 91 are fixedly connected on both sides of the cutout of each group of external core packages 8. The outer walls of the blocks 91 fixedly connected to the outer walls of the two groups of external core packages 8 fit together, so that the two groups of external core packages 8 can be matched and installed through the two relative blocks 91 to facilitate the smooth implementation of the casting work.

[0021] The inner ring of the outer core 8 is provided with a groove with strict outer diameter accuracy requirements, so that the integral groove of the pulley can be cast without the need for secondary groove processing.

[0022] The two sides of the mounting block 92 are serrated, and the serrations on both sides of the mounting block 92 match the serrations on the outer wall of the mounting clamp 94, which facilitates the stability of the connection when the mounting block 92 matches the mounting groove 93, thereby ensuring the firmness of the buckled installation of the two sets of external cores 8.

[0023] Both side walls of the mounting fixture 94 are fixedly connected to the limiting blocks 941 to ensure the stability of the movement of the mounting fixture 94, and the limiting blocks 941 move inside the limiting groove 942 along with the mounting fixture 94, and the limiting groove 942 is connected with the mounting groove 93; The two mounting clamps 94 are a group of symmetrically arranged inside the mounting groove 93, so that the two groups of mounting clamps 94 can be matched with the sawtooth blocks on both sides of the mounting block 92 to ensure the firmness of the installation.

[0024] The toggle rod 101 is in a "C" shape, and the rod bodies at both ends of the toggle rod 101 are integrally installed with the ends of the rotating shaft 102 that are rotatably connected to the upper and lower ends of the block 91 through bearings. In the process of toggling the toggle rod 101, the rotation of the rotating shaft 102 fixedly connected to the two ends of the toggle rod 101 can drive the movement of the two sets of mounting clips 94.

[0025] The outer ring of the rotating shaft 102 is movably sleeved with a torsion spring, and the two ends of the torsion spring are fixedly connected to the inner wall of the mounting groove 93 and the circular plate 103 respectively. In the initial state, the force applied by the torsion spring causes the circular plate 103 to be located at a specific angle, so that the mounting clip 94, which is movably connected to the circular plate 103 through the universal shaft 108, matches the side serrations of the mounting block 92 at this distance.

[0026] A notch 104 and a notch 106 are respectively provided inside the circular plate 103 and the mounting fixture 94, and there is a deviation in the linear positions of the notch 104 and the notch 106, and a connecting rod 105 is fixedly connected to the inner wall of the notch 104, and a connecting rod 2 107 is fixedly connected to the inner wall of the notch 106, and the connecting rod 105 and the connecting rod 2 107 are movably connected via a universal shaft 108, so that when the circular plate 103 rotates, the end position of the universal shaft 108 and the circular plate 103 that realize the universal connection changes, and the universal shaft 108 as a whole moves around the position of the connecting rod 2 107 as the center of the circle, and at this time, the mounting fixture 94 in the limited movement moves inside the mounting groove 93 under the action of the universal shaft 108.

[0027] Working principle: When using a coated sand composite core for the production of agricultural machinery pulleys, first pour the molten iron through the sprue 1, flow through the cross runner 3 and the edge pressure ingrate 4, pour the molten iron into the casting 5 cavity, and use the insulation riser 2 to compensate for shrinkage, realize the compensation of the independent heat junction near the bearing hole of the intermediate bearing, and use the exhaust needle 7 to exhaust the cavity, and complete the casting work. At the same time, the inner ring of the outer core 8 is provided with a groove, so that the overall groove of the pulley can be cast without the need for secondary groove processing, which improves the process yield, improves the internal quality, reduces the scrap rate, shortens the processing time, improves the processing efficiency, and reduces the difficulty of blank cleaning; When the two sets of outer cores 8 need to be separated, the toggle lever 101 is toggled to drive the rotation of the upper and lower rotating shafts 102 fixedly connected to the two ends of the toggle lever 101, thereby driving the rotation of the two upper and lower symmetrical circular plates 103 fixedly connected to the ends of the rotating shafts 102, wherein under the transmission action of the universal shaft 108, the circular plate 103 rotates to press against the mounting clamp 94 through the universal shaft 108 so that the mounting clamp 94 can be moved. When the circular plate 103 rotates, the end position of the universal shaft 108 and the circular plate 103 that realizes the universal connection changes, and the universal shaft 108 is connected as a whole. The position of the second connecting rod 107 is the center of the circle where the movement changes. At this time, the installation clamp 94 in the limited movement is subjected to the force of the universal shaft 108 and moves inside the installation groove 93. The toggle rod 101 is toggled in different directions so that the two upper and lower symmetrical installation clamps 94 located inside the block 91 can move towards or away from each other synchronously. When the installation clamp 94 is in the moving state, when the serrations at the end of the installation clamp 94 do not match the serrations on the side of the installation block 92, the two sets of external cores 8 can be separated, which is convenient for taking out the casting 5. The overall operation is convenient and quick. Please refer to it later. Figure 3 The mounting block 92 is installed in the direction indicated by the straight arrow and matched with the mounting groove 93. When the mounting clamp 94 inside the mounting groove 93 matches with the mounting block 92, the two sets of external core wrappings 8 can be tightly connected. At the same time, the installation process is relatively simple and quick, making the entire mold core more convenient to use.

[0028] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A coated sand composite core for producing agricultural machinery pulleys, comprising an outer core (8), characterized in that: An internal core (6) is installed inside the external core (8), a casting (5) is cast between the external core (8) and the internal core (6), a runner (3) is provided at the end of the external core (8), and the runner (3) is connected to the sprue (1) and the inner runner (4), a heat-insulating riser (2) is provided inside the internal core (6), and an exhaust needle (7) is provided inside the heat-insulating riser (2), and further comprising: A snap-fit ​​installation assembly (9), wherein the outer walls of the two groups of the outer cores (8) are fixedly connected to blocks (91), and the outer wall of one side of the blocks (91) is fixedly connected to a mounting block (92), and the mounting block (92) matches a mounting groove (93) provided inside the other opposite block (91), and the mounting groove (93) is movably connected to a mounting clamp (94), and the mounting clamp (94) matches the mounting block (92); A linkage assembly (10), wherein the interior of the block (91) is rotatably connected to a rotating shaft (102) via a bearing, the rotating shaft (102) is fixedly connected to the toggle rod (101), the rotating shaft (102) is fixedly connected to the circular plate (103), and the circular plate (103) and the mounting clamp (94) are transmission-connected via a universal shaft (108).

2. The coated sand composite core for agricultural machinery pulley production according to claim 1, characterized in that: The outer core wraps (8) are provided in two groups in number, and the two groups of outer core wraps (8) enclose a closed casting cavity, and blocks (91) are fixedly connected to both sides of the cutout of each group of outer core wraps (8), and the outer walls of the blocks (91) to which the outer walls of the two groups of outer core wraps (8) are fixedly connected fit each other.

3. The coated sand composite core for agricultural machinery pulley production according to claim 1, characterized in that: The inner ring of the outer core (8) is provided with a groove with strict requirements on the outer diameter accuracy.

4. The coated sand composite core for agricultural machinery pulley production according to claim 1, characterized in that: Both sides of the installation block (92) are serrated, and the serrations on both sides of the installation block (92) match the serrations on the outer wall of the installation clamp (94).

5. The coated sand composite core for agricultural machinery pulley production according to claim 1, characterized in that: Both side walls of the installation clamp (94) are fixedly connected to the limiting blocks (941), and the limiting blocks (941) move inside the limiting groove (942) along with the installation clamp (94), and the limiting groove (942) is connected to the installation groove (93); The two installation clamps (94) are arranged in a group symmetrically in the upper and lower parts inside the installation groove (93).

6. The coated sand composite core for producing agricultural machinery pulleys according to claim 1, characterized in that: The toggle rod (101) is in a "C" shape, and the rod bodies at both ends of the toggle rod (101) are integrally mounted with the ends of a rotating shaft (102) rotatably connected to the upper and lower ends of the block (91) via bearings.

7. The coated sand composite core for agricultural machinery pulley production according to claim 1, characterized in that: The outer ring of the rotating shaft (102) is movably sleeved with a torsion spring, and the two ends of the torsion spring are respectively fixedly connected to the inner wall of the mounting groove (93) and the circular plate (103).

8. The coated sand composite core for producing agricultural machinery pulleys according to claim 1, characterized in that: The circular plate (103) and the mounting clamp (94) are respectively provided with a first notch (104) and a second notch (106), the linear positions of the first notch (104) and the second notch (106) are deviated, and a connecting rod (105) is fixedly connected to the inner wall of the first notch (104), and a connecting rod (107) is fixedly connected to the inner wall of the second notch (106), and the connecting rod (105) and the connecting rod (107) are movably connected via a universal shaft (108).

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