Hot core box structure of precoated sand mold for manufacturing sand core

Abstract

The precoated sand mold hot core box structure comprises forming boxes and a conversion assembly, cavities are correspondingly formed in the sides, close to each other, of the two forming boxes, communicating cavities are formed in the forming boxes, and a plurality of heating cavities and a plurality of cooling cavities are formed in the sides, close to the cavities, of the communicating cavities; the conversion assembly comprises a rotating square pipe and a connecting rotating shaft, a rotating opening is formed between the water inlet cavity and the communicating cavity, and the connecting rotating shaft is rotationally connected with the inner wall of the rotating opening. The width of the bottom end of the mounting cavity is consistent with that of the rotating opening, and the length of the bottom end of the mounting cavity is larger than the side length of the rotating square pipe. The device has the effect of improving the production efficiency of the sand core.

Description

Technical Field

[0001] The present application relates to the technical field of sand core production, and in particular to a coated sand mold hot core box structure for manufacturing sand cores. Background Art

[0002] A hot core box is a metal mold used to manufacture sand cores at high temperatures (typically 200-300°C). Heating the core sand causes the resin binder in the core sand to rapidly cure, resulting in a high-strength core. During use, core sand mixed with thermosetting resin is shot into a preheated metal mold using a core shooter, which is heated to 200-300°C. The high temperature causes the resin to rapidly cross-link and solidify. After the resin and core sand have cured, the mold is cooled, opened, and the formed sand core removed. This method of sand core production offers advantages such as high production efficiency, high dimensional accuracy, excellent surface quality, and high strength.

[0003] At present, in order to improve the processing efficiency of sand cores, the hot core box needs to be cooled quickly after the temperature rise and curing is completed. Therefore, it is necessary to provide a hot core box structure that can switch the heating and cooling processes in time. Summary of the Invention

[0004] In order to improve the production efficiency of sand cores, the present application provides a coated sand mold hot core box structure for manufacturing sand cores.

[0005] The present application provides a coated sand mold hot core box structure for manufacturing sand cores, which adopts the following technical solutions: A hot core box structure of a coated sand mold for manufacturing sand cores, comprising a molding box and a conversion assembly, wherein the molding boxes are provided with two, and a molding cavity is correspondingly provided on the side of the two molding boxes close to each other, a connecting cavity is provided inside the molding box, and a plurality of heating cavities and a plurality of cooling cavities are provided on the side of the connecting cavity close to the molding cavity, the heating cavity is connected to the connecting cavity, and an installation cavity is provided between the cooling cavity and the connecting cavity, and a water inlet cavity is provided on the side of the connecting cavity away from the molding cavity, an integrated heating source and an integrated cooling source are provided on the molding box, the integrated heating source is connected to the connecting cavity, and the integrated cooling source is connected to the water inlet cavity, and the conversion assembly comprises a rotating square tube and a connecting shaft, a rotating opening connected to the water inlet cavity and the connecting cavity is provided between the water inlet cavity and the connecting cavity, and the width of the rotating opening is equal to the side length of the rotating square tube. The cam is connected to the top of the rotating shaft by a toothed connection, and the cam is connected to the top of the rotating shaft by a toothed connection, so that the cam can be connected to the top of the rotating shaft by a toothed connection.

[0006] By adopting the above technical solution, during the heating process, heat enters the heating chamber through the connecting chamber, and the sand core in the cavity is heated and cured. At this time, the rotating square tube is in a horizontal state, and the connecting chamber is in a connected state. After the heating and curing of the sand core is completed, the driving assembly starts to drive the rotating square tube to rotate to a vertical state. The first sealing plate blocks the gap between the rotating opening and the rotating square tube, and the second sealing plate blocks the gap between the installation cavity and the rotating square tube. The cooling medium enters the cooling chamber through the water inlet chamber, the rotating square tube and the installation chamber, realizing rapid cooling of the cavity, which helps to speed up the production efficiency of the sand core. Through the mutual cooperation of the molding box and the conversion assembly, timely switching of the heating and cooling processes is achieved, which has the effect of improving the production efficiency of the sand core.

[0007] Optionally, the driving assembly includes a driving shaft, a memory alloy spring, a mounting plate, a driving cam, a driving gear and a driven gear, one end of the connecting shaft extends out of the molding box and is connected to the driven gear, the driving shaft is rotatably connected to the molding box, the driving cam and the driving gear are connected to the driving shaft, the driving gear is meshed with the driven gear, the diameter of the driving gear is larger than the diameter of the driven gear, the mounting plate is connected to the molding box, the memory alloy spring is connected to the mounting plate, and the top of the memory alloy spring The end of the rotating square tube abuts against the driving cam, and the rotating square tube is in a horizontal state at normal temperature. When the temperature rises to above 150°C, the memory alloy spring extends. One end of the rotating square tube is connected to a first abutment plate along its length direction, and the other end of the rotating square tube is connected to a second abutment plate along its cross-sectional direction. When the rotating square tube is in a horizontal state, the first abutment plate is placed on the bottom surface of the connecting cavity. When the rotating square tube rotates to a vertical state, the second abutment plate abuts against the inner top wall of the water inlet cavity, and the first abutment plate abuts against the vertical inner wall of the mounting cavity.

[0008] With this technical solution, as the heating and curing process completes, the memory alloy spring expands and pushes the drive cam, causing the drive gear to rotate synchronously with the drive cam. Driven by the drive gear, the driven gear rotates, and through the connecting shaft, it drives the rotating square tube, facilitating subsequent cooling of the mold cavity.

[0009] Optionally, a sealing assembly is provided in the inner cavity of the installation cavity, and the sealing assembly includes a sliding grid, a fixed plate, a connecting rod and a sealing strip. The fixed plate and the sliding grid are both horizontally arranged in the installation cavity, the size of the fixed plate is smaller than the cross-sectional size of the installation cavity, the connecting rod is connected to the fixed plate, and the connecting rod is connected to the inner wall of the installation cavity, the sliding grid is arranged parallel to the bottom of the fixed plate and is slidably connected to the installation cavity, and the sealing strip is connected to a plurality of roots on the bottom surface of the fixed plate, and a plurality of sealing grooves corresponding to the sealing strips are provided on the sliding grid, and a driving member for driving the sliding grid to move in a vertical direction is provided in the installation cavity.

[0010] By adopting this technical solution, during the heating process, the sliding grid plate engages with the fixed plate, and the blocking strip is embedded in the blocking groove, thereby sealing the installation cavity. This reduces the possibility of residual moisture in the cooling chamber flowing through the installation cavity into the connecting cavity. During the cooling process, the sliding grid plate, driven by the driving member, moves downward and separates from the fixed plate, releasing the blockage of the installation cavity and enabling communication between the rotating square tube and the installation cavity.

[0011] The top end of the lifting block is connected with the first support frame, and the second support frame is connected with the first support frame by the second cam.

[0012] By adopting this technical solution, when the first abutment plate rotates to a vertical position along with the rotating square tube, the first and second pressure blocks come into contact and slide relative to each other. The second pressure block moves downward, and the sliding grid plate moves downward and separates from the fixed plate. The blocking strip separates from the blocking slot, and the installation cavity now communicates with the rotating square tube.

[0013] Optionally, a heat conduction hole is provided between the heating cavity and the mold cavity, communicating with both of them at the same time; a heat conduction component is provided in the heating cavity, the heat conduction component includes a heat conduction pin, and a heat conduction pin is provided in the heat conduction hole.

[0014] By adopting the above technical solution, the heat-conducting pin is directly inserted into the mold cavity, and the heat is directly transferred to the mold cavity during the heating process, and the heat is concentrated and transferred to the thicker part of the sand core, thereby further improving the heating and curing effect of the sand core.

[0015] The locking mechanism is configured to lock the locking cam of the locking cam, wherein the locking cam has a lockhole that is located adjacent the locking cam and a lockhole that is located adjacent the locking cam.

[0016] By adopting this technical solution, when the first abutment plate contacts the inner wall of the mounting cavity, the contact block is pressed down, the push rod slides, and drives the third pressing block to move. The third and fourth pressing blocks move relative to each other, and the fourth pressing block moves away from the cavity. The mounting rod drives the heat transfer pin out of the heat transfer hole. This prevents the heat transfer pin from continuing to transfer heat to the sand core during the cooling process, helping to improve the cooling efficiency of the sand core.

[0017] Optionally, a plurality of sealing rubber sheets are provided in the heat conduction hole.

[0018] By adopting the above technical solution, when the heat-conducting pin exits the heat-conducting hole, the sealing rubber sheet seals the heat-conducting hole, thereby reducing the possibility of the material in the cavity falling into the heating cavity.

[0019] Optionally, the integrated cooling source includes a cooling water tank, a water pipe, a return pipe and a water pump, one end of the water pipe extends into the molding box and is connected to the water inlet cavity, the other end of the water pipe is connected to the cooling water tank, the water pump is connected to the water pipe, one end of the return pipe extends into the molding box and is connected to the cooling cavity, the other end of the return pipe is connected to the cooling water tank, and a vibration motor is provided on the water pipe.

[0020] By adopting this technical solution, during cooling, the water pump pumps water from the water tank into the water inlet chamber. The water then flows through the rotating square tube and the installation chamber into the cooling chamber, cooling the cavity. The cooled water then flows back to the cooling tank through the return pipe. During the water delivery process, the vibration motor activates to vibrate the water tank, helping to reduce the possibility of scale forming in the water pipe.

[0021] In summary, this application includes at least one of the following beneficial technical effects: 1. Through the cooperation of the forming box and the conversion assembly, the timely switching of the heating and cooling processes is achieved, which has the effect of improving the production efficiency of the sand core; 2. The heat-conducting pin is directly inserted into the cavity, and the heat is directly transferred to the cavity during the heating process, focusing the heat transfer on the thicker part of the sand core, further improving the heating and curing effect of the sand core; 3. The memory alloy spring is used to realize the timely switching of the rotation angle of the rotating square tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural schematic diagram of a hot core box structure of a coated sand mold for manufacturing sand cores, which is used in an embodiment of the present application.

[0023] Figure 2 It is a partial cross-sectional view used to illustrate the internal structure of the molding box in the embodiment of the present application.

[0024] Figure 3 yes Figure 1 Enlarged view of part A in the middle.

[0025] Figure 4 yes Figure 2 Enlarged view of part B in the middle.

[0026] Figure 5 yes Figure 4 Enlarged view of part C in the middle.

[0027] Explanation of reference numerals: 1. molding box; 101. molding cavity; 102. connecting cavity; 103. water inlet cavity; 104. heating cavity; 105. cooling cavity; 106. mounting cavity; 107. heating cavity; 108. conveying cavity; 109. rotating opening; 110. sliding groove; 111. receiving groove; 112. heat conducting hole; 2. conversion assembly; 21. rotating square tube; 22. first abutting plate; 23. first pressing block; 24. second abutting plate; 25. connecting shaft; 3. driving assembly; 31. driving shaft; 32. memory alloy spring; 33. mounting plate; 34. pushing block; 35. driving cam; 36. driving gear; 37. driven gear; 4 , sealing assembly; 41, sliding grid; 411, sealing groove; 42, fixed plate; 421, sealing strip; 43, connecting rod; 44, horizontal plate; 45, vertical plate; 46, second pressure block; 47, sliding rod; 48, tightening spring; 49, limit block; 5, heat conduction assembly; 51, contact block; 52, push rod; 53, contact spring; 54, third pressure block; 55, heat conduction pin; 56, mounting rod; 57, fourth pressure block; 58, reset spring; 6, heating wire; 7, cooling water tank; 8, water pipe; 9, return pipe; 10, water pump; 11, vibration motor; 12, first sealing plate; 13, second sealing plate; 14, sealing rubber sheet. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-5 The present application is further described in detail. The present application provides a coated sand mold hot core box structure for manufacturing sand cores, which has the effect of improving the production efficiency of sand cores.

[0029] Reference Figure 1-3A hot core box structure of a coated sand mold for manufacturing sand cores includes a molding box 1, a conversion component 2, a drive component 3, a sealing component 4 and a heat conduction component 5. Two molding boxes 1 are provided, and one side of the two molding boxes 1 is arranged in contact with each other. A mold cavity 101 is correspondingly provided on each side of the two molding boxes 1 that are in contact with each other, and the inner wall of the mold cavity 101 is plated with a copper-tungsten alloy layer for heat conduction. A connecting cavity 102 is provided inside the molding box 1, and the connecting cavity 102 is a rectangular inner cavity. A water inlet cavity 103 is provided on the side of the connecting cavity 102 away from the mold cavity 101, and a plurality of heating cavities 104 and a plurality of cooling cavities 105 are provided on the side of the connecting cavity 102 close to the mold cavity 101. The plurality of heating cavities 104 and the plurality of cooling cavities 105 are arranged parallel to and spaced apart from each other, and the heating cavity 104 and the cooling cavity 105 are both arranged perpendicular to the connecting cavity 102. The heating chamber 104 is connected to the connecting chamber 102, and an installation chamber 106 is provided between the cooling chamber 105 and the connecting chamber 102. The molding box 1 is provided with an integrated heating source and an integrated cooling source. The integrated heating source includes a heating wire 6. A heating chamber 107 is provided inside the molding box 1, and the heating wire 6 is provided in the heating chamber 107. A conveying chamber 108 is provided between the heating chamber 107 and the connecting chamber 102, connecting both.

[0030] Reference Figure 1 and Figure 2 The integrated cooling source includes a cooling water tank 7, a water supply pipe 8, a return pipe 9, and a water pump 10. The cooling water tank 7 is located outside the molding box 1. One end of the water supply pipe 8 extends into the molding box 1 and communicates with the water inlet chamber 103, while the other end communicates with the cooling water tank 7. The water pump 10 is connected to the water supply pipe 8 and is equipped with a vibration motor 11. A plurality of return pipes 9 are provided, each corresponding to and communicating with the cooling chambers 105. The other end of the return pipe 9 communicates with the cooling water tank 7.

[0031] Reference Figure 2 and Figure 4The conversion assembly 2 is provided in several groups between the connecting chamber 102 and the water inlet chamber 103. The groups of conversion assemblies 2 are arranged in a one-to-one correspondence with the installation chambers 106. The conversion assembly 2 includes a rotating square tube 21, a first abutment plate 22, a first pressure block 23, a second abutment plate 24, and a connecting shaft 25. A rotating opening 109 is provided between the water inlet chamber 103 and the connecting chamber 102, which is connected to both. The width of the longitudinal section of the connecting chamber 102 and the width of the rotating opening 109 are both consistent with the side length of the rotating square tube 21. The width of the connecting chamber 102 in the vertical direction is consistent with the length of the rotating square tube 21. The length of the rotating opening 109 is equal to the length of the diagonal line connecting the side walls of the rotating square tube 21. The connecting shaft 25 is connected to one end of the rotating square tube 21 along the length direction of the side. The connecting shaft 25 is rotatably connected to the inner wall of the rotating opening 109. The connecting shaft 25 is provided at one end of the rotating opening 109 along the width direction of the rotating opening 109.

[0032] Reference Figure 4 The first abutment plate 22 is connected to one end of the rotating square tube 21 along the length direction of the rotating square tube 21, and the second abutment plate 24 is connected to the other end of the rotating square tube 21 along the cross-sectional direction of the rotating square tube 21. The first abutment plate 22 and the second abutment plate 24 are arranged perpendicularly. The first pressing block 23 is connected to the side of the first abutment plate 22 away from the rotating square tube 21. The side of the first pressing block 23 away from the first abutment plate 22 is provided with a first inclined surface. When the rotating square tube 21 is in a horizontal state, the first abutment plate 22 overlaps the inner bottom wall of the connecting cavity 102. When the rotating square tube 21 rotates to a vertical state, the first abutment plate 22 abuts against the vertical inner wall of the installation cavity 106, and the second abutment plate 24 abuts against the inner top wall of the water inlet cavity 103. A first sealing sheet 12 is horizontally connected to the inner wall of the rotating opening 109 away from the connecting shaft 25. The first sealing sheet 12 is made of flexible material. When the rotating square tube 21 rotates to a vertical state, the first sealing sheet 12 is in close contact with the outer wall of the rotating square tube 21.

[0033] Reference Figure 3 and Figure 4, several groups of drive components 3 are arranged outside the molding box 1, and several groups of drive components 3 are arranged one-to-one corresponding to several rotating square tubes 21. The drive component 3 includes a drive shaft 31, a memory alloy spring 32, a mounting plate 33, a push block 34, a drive cam 35, a drive gear 36 and a driven gear 37. The drive shaft 31 is rotatably connected to the outside of the molding box 1, and the drive cam 35 and the drive gear 36 are both sleeved on the drive shaft 31. One end of the connecting shaft 25 extends out of the molding box 1 and is connected to the driven gear 37. The diameter of the driven gear 37 is smaller than the diameter of the drive gear 36, and the drive gear 36 is meshed with the driven gear 37. The mounting plate 33 is horizontally connected to the molding box 1 and is located below the drive cam 35. The memory alloy spring 32 is connected to the top surface of the mounting plate 33, and the top of the memory alloy spring 32 abuts against the protrusion. When the temperature of the molding box 1 is lower than 150°C, the memory alloy spring 32 will not deform. When the temperature of the molding box 1 rises to 150° C., the length of the memory alloy spring 32 extends by 1.5 mm.

[0034] Reference Figure 4 and Figure 5 The blocking assembly 4 is arranged in the installation cavity 106. The blocking assembly 4 includes a sliding grid plate 41, a fixed plate 42, a connecting rod 43, a horizontal plate 44, a vertical plate 45, a second pressure block 46, a sliding rod 47, a tightening spring 48 and a limit block 49. The fixed plate 42 is horizontally arranged in the installation cavity 106. The size of the fixed plate 42 is smaller than the cross-sectional size of the installation cavity 106. The bottom surface of the fixed plate 42 is connected to a plurality of blocking strips 421 in parallel. The connecting rods 43 are connected to a plurality of edges of the fixed plate 42. The connecting rods 43 are connected to the inner wall of the installation cavity 106. The sliding grid plate 41 is horizontally slidably arranged in the installation cavity 106. The sliding grid plate 41 is located below the fixed plate 42. A plurality of blocking slots 411 are opened in parallel on the sliding grid plate 41. The plurality of blocking slots 411 and the plurality of blocking strips 421 are arranged in a one-to-one correspondence in the vertical direction. When the rotating square tube 21 is rotated to a vertical position, the first abutment plate 22 abuts against one of the vertical inner walls of the mounting cavity 106, which has a sliding groove 110 extending vertically thereon. A horizontal plate 44 is horizontally connected to the side of the sliding grid 41 near the sliding groove 110. The horizontal plate 44 slides within the sliding groove 110, with the side of the horizontal plate 44 abutting against the vertical inner wall of the sliding groove 110. The top of the vertical plate 45 is vertically connected to the side of the horizontal plate 44 away from the sliding grid 41, with the vertical plate 45 abutting against the vertical inner wall of the sliding groove 110. A second pressure block 46 is connected to the bottom of the vertical plate 45 away from the vertical inner wall of the sliding groove 110. A second inclined surface is provided on the side of the second pressure block 46 away from the inner wall of the sliding groove 110, corresponding to the first inclined surface of the first pressure block 23. The cross-sectional area of ​​the second pressure block 46 gradually increases vertically.

[0035] Reference Figure 4and Figure 5 The slide bar 47 is vertically disposed in the slide groove 110. The top end of the slide bar 47 is connected to the inner top wall of the slide groove 110, and the bottom end of the slide bar 47 is connected to the stop block 49. The slide bar 47 passes through the vertical plate 45 and is slidably connected thereto. A holding spring 48 is sleeved on the slide bar 47. One end of the holding spring 48 is connected to the inner top wall of the slide groove 110, and the other end is connected to the top of the vertical plate 45. In the natural state, the slide grid 41 is pressed against the bottom surface of the fixed plate 42 under the action of the holding spring 48. At this time, the blocking strip 421 is embedded in the blocking groove 411.

[0036] Reference Figure 2 and Figure 4 The bottom end of the installation cavity 106 is connected to a second sealing sheet 13, which is made of an elastic material. When the rotating square tube 21 rotates to a vertical state, the second sealing sheet 13 blocks the gap between the bottom opening of the installation cavity 106 and the rotating square tube 21. The heat-conducting component 5 is arranged in the heating cavity 104. The heat-conducting component 5 includes a contact block 51, a propulsion rod 52, a contact spring 53, a third pressure block 54, a heat-conducting pin 55, a mounting rod 56, a fourth pressure block 57 and a reset spring 58. A receiving groove 111 is provided on the vertical inner wall of the installation cavity 106. The receiving groove 111 is located below the sliding groove 110. A propulsion hole is horizontally provided in the receiving groove 111 and the adjacent heating cavity 104. The propulsion rod 52 is horizontally slidably connected to the propulsion hole. One end of the propulsion rod 52 extends into the receiving groove 111 and is connected to the contact block 51. The other end extends into the heating cavity 104 and is connected to the third pressure block 54. A return spring 58 is disposed in the receiving groove 111. One end of the return spring 58 is connected to the inner bottom wall of the receiving groove 111, and the other end is connected to the contact block 51. In a natural state, the contact block 51 extends out of the receiving groove 111 under the action of the return spring 58. A third inclined surface is provided on the bottom surface of the end of the third pressing block 54 away from the push rod 52.

[0037] Reference Figure 4 , a number of heat-conducting holes 112 are provided between the heating chamber 104 and the mold cavity 101, and the heat-conducting pins 55 are slidably set in the heat-conducting holes 112, and the inner wall of the heat-conducting holes 112 is connected to a sealing rubber sheet 14. A mounting rod 56 is vertically connected to the bottom end of each heat-conducting pin 55, and a fourth pressure block 57 is arranged in the heating chamber 104 and connected to the bottom end of the mounting rod 56. A fourth inclined surface is provided on the side of the fourth pressure block 57 close to the third pressure block 54, and the third inclined surface is arranged corresponding to the fourth inclined surface. The reset spring 58 is sleeved on the mounting rod 56, and one end of the reset spring 58 is connected to the inner top wall of the heating chamber 104, and the other end is connected to the top surface of the fourth pressure block 57. In the natural state, the end of the heat-conducting pin 55 extends 2mm into the mold cavity 101 under the action of the reset spring 58.

[0038] Reference Figure 2 and Figure 4In the process of making the sand core, the raw material is first injected into the mold cavity 101 of the molding box 1. The heating wire 6 in the heating cavity 107 works to heat the interior, and the heat is transferred to the heating cavity 104 through the conveying cavity 108 and the connecting cavity 102, and the material in the mold cavity 101 is continuously heated and cured. At this time, the heat-conducting pin 55 is inserted into the mold cavity 101, and direct heat conduction is performed on the thicker part of the sand core, which helps to improve its heating and curing efficiency. At this time, the rotating square tube 21 is in a horizontal state, and the rotating square tube 21, the first sealing plate 12 and the first abutment plate 22 jointly block the rotating opening 109. The interior of the connecting cavity 102 is in a connected state, and heat can be directly transferred through the connecting cavity 102.

[0039] Reference Figure 2-4 After the sand core in cavity 101 has completed thermal curing, the overall temperature of cavity 101 continues to rise. At this time, the memory alloy spring 32 extends, and the push block 34 pushes the drive cam 35 to rotate a certain angle, causing the drive gear 36 to rotate synchronously with the drive cam 35. Driven by the drive gear 36, the driven gear 37 rotates, and the connecting shaft 25 drives the rotating square tube 21 connected to it. The provision of the first abutment plate 22 and the second abutment plate 24 limits the rotation angle of the rotating square tube 21. The provision of the conversion assembly 2 enables timely switching between the heating and cooling states, helping to accelerate the heating and cooling efficiency of the sand core. The rotating square tube 21 rotates counterclockwise until it connects with the bottom end of the installation cavity 106. At this time, the first pressure block 23 on the first abutment plate 22 contacts and slides relative to the second pressure block 46 in the sliding groove 110, and the second pressure block 46 slides downward along the sliding rod 47, driving the sliding grid plate 41 to move downward. At this time, the blocking strip 421 on the fixed plate 42 is separated from the blocking groove 411, releasing the seal on the inner cavity of the installation cavity 106.

[0040] Reference Figure 2 、 Figure 4 and Figure 5 The water pump 10 starts, pumping water from the cooling water tank 7 into the water inlet chamber 103. The water in the water inlet chamber 103 enters the plurality of mounting chambers 106 through the rotating square tube 21. The water in the mounting chamber 106 enters the cooling chamber 105 through the plurality of blocking slots 411 on the sliding grid 41, thereby cooling the mold cavity 101 through the cooling chamber 105. The cooled water flows back to the cooling water tank 7 through the return pipe 9. During the water delivery process, the vibration motor 11 starts, vibrating the water pipe 8 to reduce the possibility of scale formation therein. While cooling, the heating wire 6 stops operating, and the rotating square tube 21 rotates into the connecting chamber 102, separating the connecting chamber 102 and reducing the possibility of heat transmission through the connecting chamber 102. The configuration of the blocking assembly 4 prevents residual water in the cooling chamber 105 from flowing back into the connecting chamber 102 through the mounting chamber 106 during the heating and curing process.

[0041] Reference Figure 4 and Figure 5 When the first abutment plate 22 contacts the inner wall of the mounting cavity 106, the contact block 51 is pressed down by the first abutment plate 22, and the contact spring 53 is compressed to accumulate elastic potential energy. The push rod 52 slides toward the heating cavity 104. The third pressure block 54 and the fourth pressure block 57 slide relative to each other, and the fourth pressure block 57 moves away from the mold cavity 101, and the heat conducting pin 55 moves out of the mold cavity 101, preventing direct heat transfer through the heat conducting pin 55. The sealing rubber sheet 14 blocks the heat conducting hole 112, reducing the risk of material in the mold cavity 101 falling into the heating cavity 104 through the heat conducting hole 112.

[0042] The implementation principle of a hot core box structure of a coated sand mold for manufacturing sand cores in an embodiment of the present application is as follows: in the process of making the sand core, the raw material is first injected into the mold cavity 101 of the molding box 1. The heating wire 6 works to continuously heat and solidify the material in the mold cavity 101. When the sand core in the mold cavity 101 is completed by thermal solidification, the memory alloy spring 32 is heated and elongated, and the driven gear 37 rotates under the drive of the driving gear 36, and the connecting shaft 25 drives the rotating square tube 21 connected thereto to rotate. The rotating square tube 21 rotates counterclockwise until it is connected to the bottom end of the installation cavity 106. The water supply pump 10 is started to pump the water in the cooling water tank 7 into the water inlet cavity 103, and the water in the water inlet cavity 103 enters the several installation cavities 106 through the rotating square tube 21, and the cooling operation of the mold cavity 101 is realized through the cooling cavity 105.

[0043] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A hot box structure for a coated sand mold for manufacturing sand cores, characterized by: The invention comprises a molding box (1) and a conversion assembly (2), wherein two molding boxes (1) are provided, and a molding cavity (101) is correspondingly provided on the side of the two molding boxes (1) close to each other, and a connecting cavity (102) is provided inside the molding box (1), and a plurality of heating cavities (107) and a plurality of cooling cavities (105) are provided on the side of the connecting cavity (102) close to the molding cavity (101), and the heating cavity (107) is connected to the connecting cavity (102), and an installation cavity (106) is provided between the cooling cavity (105) and the connecting cavity (102), and the connecting cavity (102) is away from the connecting cavity (102). A water inlet cavity (103) is provided on one side of the mold cavity (101), an integrated heating source and an integrated cooling source are provided on the molding box (1), the integrated heating source is connected to the connecting cavity (102), and the integrated cooling source is connected to the water inlet cavity (103), the conversion component (2) includes a rotating square tube (21) and a connecting shaft (25), a rotating opening (109) is provided between the water inlet cavity (103) and the connecting cavity (102), and the rotating opening (109) is connected to the water inlet cavity (103) and the connecting cavity (102), the width of the rotating opening (109) is consistent with the side length of the rotating square tube (21), and the length of the rotating opening (109) is the same as the side length of the rotating square tube (21). The width of the rotating square tube (21) is greater than the side length of the rotating square tube (21), the connecting shaft (25) is arranged at one end of the rotating square tube (21) along the side length direction, the connecting shaft (25) is rotatably connected to the inner walls of the two opposite ends of the rotating opening (109) in the width direction, the connecting shaft (25) is arranged at one end of the rotating opening (109) in the length direction, and the other end of the rotating opening (109) is provided with a first sealing sheet (12), the bottom end width of the installation cavity (106) is consistent with the width of the rotating opening (109), and the bottom end length of the installation cavity (106) is greater than the width of the rotating square tube (21). The side length of the installation cavity (106) is provided with a second sealing sheet (13) at one end in the longitudinal direction of the installation cavity (106), and the first sealing sheet (12) and the second sealing sheet (13) are both made of elastic material. When the rotating square tube (21) is rotated to a vertical state, the two ends of the rotating square tube (21) are connected to the water inlet cavity (103) and the installation cavity (106) respectively, and the second sealing sheet (13) blocks the gap between the top of the rotating square tube (21) and the inner wall of the installation cavity (106). The molding box (1) is provided with a driving component (3) for driving the connecting shaft (25) to rotate.

2. The hot box structure of a coated sand mold for manufacturing sand cores according to claim 1, characterized in that: The driving assembly (3) includes a driving shaft (31), a memory alloy spring (32), a mounting plate (33), a driving cam (35), a driving gear (36) and a driven gear (37). One end of the connecting shaft (25) extends out of the molding box (1) and is connected to the driven gear (37). The driving shaft (31) is rotatably connected to the molding box (1). The driving cam (35) and the driving gear (36) are connected to the driving shaft (31). The driving gear (36) is meshed with the driven gear (37). The diameter of the driving gear (36) is larger than the diameter of the driven gear (37). The mounting plate (33) is connected to the molding box (1). The memory alloy spring (32) is connected to the mounting plate (33). The top end of the memory alloy spring (32) abuts against the driving cam (35). Under normal temperature, the rotating square tube (21) is in a horizontal state. When the temperature rises to above 150°C, the memory alloy spring (32) extends. One end of the rotating square tube (21) is connected to a first abutting plate (22) along its length direction, and the other end of the rotating square tube (21) is connected to a second abutting plate (24) along its cross-sectional direction. When the rotating square tube (21) is in a horizontal state, the first abutting plate (22) is placed on the bottom surface of the connecting cavity (102). When the rotating square tube (21) rotates to a vertical state, the second abutting plate (24) abuts against the inner top wall of the water inlet cavity (103), and the first abutting plate (22) abuts against the vertical inner wall of the installation cavity (106).

3. The hot box structure of a coated sand mold for manufacturing sand cores according to claim 2, characterized in that: A blocking assembly (4) is provided in the inner cavity of the installation cavity (106), and the blocking assembly (4) includes a sliding grid plate (41), a fixed plate (42), a connecting rod (43) and a blocking strip (421). The fixed plate (42) and the sliding grid plate (41) are both horizontally arranged in the installation cavity (106). The size of the fixed plate (42) is smaller than the cross-sectional size of the installation cavity (106). The connecting rod (43) is connected to the fixed plate (42). The connecting rod (43) is connected to the fixing plate (42). The inner wall of the installation cavity (106) is connected, the sliding grid plate (41) is arranged parallel to the bottom of the fixed plate (42) and is slidably connected to the installation cavity (106), a plurality of sealing strips (421) are connected to the bottom surface of the fixed plate (42), a plurality of sealing grooves (411) corresponding to the sealing strips (421) are arranged on the sliding grid plate (41), and a driving member for driving the sliding grid plate (41) to move in the vertical direction is arranged in the installation cavity (106).

4. The hot box structure of a coated sand mold for manufacturing sand cores according to claim 3, characterized in that: A sliding groove (110) is provided on the vertical inner wall of the installation cavity (106), and a horizontal plate (44) is slidably provided in the sliding groove (110), one end of the horizontal plate (44) is connected to the sliding grid plate (41), and the other end is connected to the vertical plate (45), the first abutting plate (22) is connected to a first pressing block (23) on the side away from the rotating square tube (21), and the first pressing block (23) is provided with a first inclined surface on the end away from the first abutting plate (22), the bottom end of the vertical plate (45) is connected to a second pressing block (46) on the side away from the inner wall of the sliding groove (110), and the second pressing block (46) is provided with a first inclined surface on the top end away from the vertical plate (45). Two inclined surfaces, a sliding rod (47) is vertically arranged in the sliding groove (110), the sliding rod (47) passes through the vertical plate (45) and is slidably connected thereto, a pressing spring (48) is sleeved on the sliding rod (47), one end of the pressing spring (48) is connected to the inner top wall of the sliding groove (110), and the other end is connected to the top of the vertical plate (45). In a natural state, the sliding grid plate (41) is pressed against the bottom surface of the fixed plate (42) under the action of the pressing spring (48), and when the rotating square tube (21) is rotated to a vertical state, the first inclined surface of the first pressing block (23) and the second inclined surface of the second pressing block (46) are slidably fitted.

5. The hot box structure of a coated sand mold for manufacturing sand cores according to claim 4, characterized in that: A heat conduction hole (112) is provided between the heating cavity (104) and the mold cavity (101) and is in communication with both. A heat conduction component (5) is provided in the heating cavity (104). The heat conduction component (5) includes a heat conduction pin (55). A heat conduction pin (55) is provided in the heat conduction hole (112).

6. The hot box structure of a coated sand mold for manufacturing sand cores according to claim 5, characterized in that: The mounting cavity (106) is provided with a receiving groove (111) on the inner wall of the sliding cavity, and the receiving groove (111) is provided below the sliding groove (110). A push rod (52) is provided in the molding box (1) for horizontal sliding, and one end of the push rod (52) extends into the receiving groove (111) and is connected to a contact block (51). A contact spring (53) is provided in the receiving groove (111), and one end of the contact spring (53) is connected to the inner bottom wall of the receiving groove (111). In a natural state, the contact block (51) extends out of the receiving groove (111) under the action of the contact spring (53), and the other end is connected to the contact block (51). The push rod (52) ) is connected to a third pressure block (54) at the other end, and a third inclined surface is provided on the bottom surface of the third pressure block (54) away from one end of the propulsion rod (52). The bottom end of the heat-conducting pin (55) is vertically connected to a mounting rod (56), and the bottom end of the mounting rod (56) is connected to a fourth pressure block (57). A fourth inclined surface corresponding to the third inclined surface is provided on the side of the fourth pressure block (57) close to the third pressure block (54). A reset spring (58) is sleeved on the mounting rod (56), and one end of the reset spring (58) is connected to the inner top wall of the heating chamber (104), and the other end is connected to the fourth pressure block (57). In a natural state, the top end of the heat-conducting pin (55) extends into the cavity (101).

7. The hot box structure of a coated sand mold for manufacturing sand cores according to claim 6, characterized in that: A plurality of sealing rubber sheets (14) are provided in the heat conduction hole (112).

8. The hot box structure of a coated sand mold for manufacturing sand cores according to claim 1, characterized in that: The integrated cooling source comprises a cooling water tank (7), a water delivery pipe (8), a return pipe (9) and a water delivery pump (10); one end of the water delivery pipe (8) extends into the molding box (1) and is connected to the water inlet chamber (103); the other end of the water delivery pipe (8) is connected to the cooling water tank (7); the water delivery pump (10) is connected to the water delivery pipe (8); one end of the return pipe (9) extends into the molding box (1) and is connected to the cooling chamber (105); the other end of the return pipe (9) is connected to the cooling water tank (7); and a vibration motor (11) is provided on the water delivery pipe (8).

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