A core shooter

Abstract

The application discloses a core shooting machine, which comprises a frame, a pneumatic source for providing high-pressure airflow, a sand storage hopper for storing sand particles, and a core box; a sand shooting box is installed on the frame and can be communicated with the sand storage hopper and the core box respectively, a storage bin for storing sand particles is arranged in the sand shooting box; a connecting assembly is provided with a connecting channel, the connecting channel is connected with the storage bin, a nozzle and the pneumatic source respectively; a gas pressure balancing assembly is arranged between the pneumatic source and the connecting assembly and can divide the gas pressure provided by the pneumatic source into several parts, the gas pressure balancing assembly comprises a gas pressure bin and a plurality of sealing plates, the sealing plates separate the gas pressure bin into a plurality of air cavities, and the pneumatic source is communicated with different air cavities through the connecting channel. The gas pressure balancing assembly can dynamically adjust the opening pressure threshold according to the real-time weight of the sand particles in the storage bin, the spiral groove in the nozzle can make the sand flow rotate at high speed, the centrifugal force is utilized to uniformly distribute the sand particles to the periphery, and the inherent uneven distribution problem that the center of the sand airflow is dense and the edge is sparse is completely solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of intelligent foundry islands, and in particular to a core shooter. BACKGROUND

[0002] As a modular production unit integrating traditional foundry processes and intelligent manufacturing technologies, the intelligent foundry island upgrades the whole process of sand mold casting through the integration of automated equipment, sensors, the Internet of Things, big data analysis, and digital twinning, etc., to achieve continuous process optimization, and breaks through the traditional pain points while retaining the advantages of low cost and high adaptability, becoming a flexible and efficient modern casting method. The core shooter is a core component of the foundry island and is mainly used for manufacturing sand cores, which is an indispensable core-making equipment in the casting process.

[0003] The working process of the core shooter is a high-efficiency, continuous and automated cycle: first, the core sand coated with resin binder is filled into the sand storage bin, and the mold closing mechanism tightly closes the precisely machined metal core box; then, compressed air is instantaneously released to shoot the core sand into the core box cavity at high speed and fill it tightly; next, according to different processes (hot core box through heating and curing, cold core box blows in catalyst gas), the core sand rapidly hardens in the cavity; finally, the core box is opened, and the ejection mechanism smoothly ejects the hardened sand core, completing a core-making cycle.

[0004] The existing core shooter has the problem of uneven sand core local compactness during sand shooting, such as the sand particles stacking in a conical manner during sand shooting, and different nozzle shooting pressures, which easily lead to uneven sand core local shooting. SUMMARY

[0005] The purpose of the present application is to provide a core shooter to solve the problem of uneven sand shooting.

[0006] The core shooter provided by the present application adopts the following technical solution:

[0007] A core shooter includes a frame, a pneumatic source for providing high-pressure airflow, a sand storage hopper for storing sand particles, and a core box; a sand shooting box is installed on the frame and can communicate with the sand storage hopper and the core box respectively, and the sand shooting box is provided with a storage bin for storing sand particles; a connecting assembly is provided with a connecting channel, and the connecting channel is connected with the storage bin, the nozzle, and the pneumatic source respectively; a gas pressure balancing assembly is arranged between the pneumatic source and the connecting assembly, and can divide the gas pressure provided by the pneumatic source into several parts, including a gas pressure bin and several sealing plates, the sealing plates separate the gas pressure bin into multiple gas cavities, and the pneumatic source communicates with different gas cavities through the connecting channel;

[0008] When the pneumatic source provides high-pressure airflow, the high-pressure airflow is balanced through the multiple gas cavities and can provide the same pressure airflow to each nozzle.

[0009] Optionally, the connecting assembly comprises a flow divider and a connecting body, the flow divider is in sliding connection with the sand shooting box, the flow divider and the sand shooting box form a storage bin inside, the flow divider is provided with a plurality of flow channels, and the connecting channel is arranged in the connecting body and in communication with the flow channels.

[0010] By adopting the above technical scheme, a gas pressure balancing assembly is inserted between the gas source and the nozzle as a "pressure regulating center". Through the unique parallel pressure equalization design of the multiple gas chambers, it is ensured that the power source distributed to each nozzle is completely the same, thereby eliminating the phenomenon of uneven sand shooting from the root, finally realizing the core effect of uniform and consistent sand core tightness, and improving the process quality and stability of the core shooting machine.

[0011] Optionally, the flow divider is fixedly connected with a first pipeline, the connecting body is fixedly connected with a second pipeline, the first pipeline and the second pipeline are sleeved, the first pipeline or the second pipeline is provided with an electric control switch, the first pipeline is in communication with the flow channels, and the second pipeline is in communication with the connecting channel.

[0012] By adopting the above technical scheme, the first pipeline and the second pipeline are movably sealed, the sealing performance is improved, the electric control switch automatically controls the on-off of the sand shooting pipeline, the switching of the core shooting machine between the "sand filling" and "sand shooting" stations is perfectly realized, the sand shooting system (the gas pressure balancing assembly) of the core is ensured not to be disturbed, and it is a key design for improving the automation degree, production efficiency and operation reliability of the equipment.

[0013] Optionally, the number of the plugging plates is 1, the plugging plate divides the inner part of the gas pressure bin into an upper chamber and a lower chamber, the upper chamber and the lower chamber can be in communication, the connecting channel is in communication with the upper chamber, and the gas source is in communication with the lower chamber.

[0014] By adopting the above technical scheme, the high-pressure gas flow first enters the lower chamber from the gas source. At this time, since the volume of the lower chamber is relatively small compared with the total volume, it can be filled very quickly and the target pressure can be established. This stage is a "pre-pressurization" for the main sand shooting action; after the lower chamber pressure is established, the high-pressure gas flow rapidly flows into the upper chamber through the structure (such as pressure equalization holes, gaps, etc.) that can be in communication on the plugging plate. Since the upper chamber is already in communication with all the pipelines in front of the nozzles through the connecting channel, the pre-pressurization process of the upper chamber is essentially a pre-pressurization for the entire sand shooting pipeline network.

[0015] Optionally, the flow divider is provided with a pressure rod, the pressure rod penetrates through one side of the gas pressure bin and is fixedly connected with the plugging plate, the sand shooting box is provided with a first spring, and the first spring applies an upward thrust to the flow divider.

[0016] By adopting the technical scheme, the system can dynamically increase the pressing force of the blocking plate by using the high pressure of the sand shooting itself, so that better sealing is automatically realized under high pressure working condition, pressure leakage is prevented, and sand shooting strength is ensured.

[0017] Optionally, the connecting channel is a multidirectional channel, and the connecting channel comprises a first channel in a vertical direction and a second channel in an inclined direction, the first channel and the second channel are in communication, the first channel is in communication with the upper cavity and the nozzle respectively, and the second channel is in communication with the shunt channel.

[0018] By adopting the technical scheme, the high-pressure airflow flows in the first channel, and the second channel is inclined to the entering end of the airflow of the first channel, so that the rapid flow of the high-pressure airflow generates a negative pressure, and the sand particles can better enter the second channel.

[0019] Optionally, the nozzle comprises a nozzle body and a flow channel, the nozzle body is externally provided with a connecting part matched with the connecting channel, and the flow channel internally comprises a spiral part and a gathering part, the spiral part is in communication with the gathering part, and the spiral part is in communication with the connecting channel.

[0020] By adopting the technical scheme, the special structure inside the nozzle actively intervenes and reshapes the airflow form, so that the sand particle shooting effect is fundamentally optimized; under the action of the centrifugal force generated by the high-speed rotation of the spiral part, the sand particles at the edge position are thrown to the periphery of the spiral part. This process effectively breaks the natural distribution state that the sand particles at the center of the airflow are high in concentration and the sand particles at the edge are low in concentration, and realizes the uniform distribution of the sand particles in the cross section; after the rotating fluid of the gathering part enters the tapering or straight gathering part, the tangential velocity component thereof is rapidly attenuated due to the constraint and friction of the pipe wall, the rotational kinetic energy is converted into axial kinetic energy and internal energy, and a high-quality air-sand jet flow is sprayed from the gathering part outlet, wherein the sand particles are uniformly distributed and mainly move at high speed in the axial direction.

[0021] Optionally, the core box comprises an upper mold and a lower mold, the upper mold is fixedly connected with the rack, the rack is provided with a lifting platform, and the lower mold is fixedly connected with the lifting platform.

[0022] By adopting the technical scheme, the lifting platform rises to push the lower mold to tightly close with the fixed upper mold to form a closed cavity. At this time, the advantages of the fixed upper mold are fully displayed, the sand shooting head is stably docked, high-pressure sand shooting is performed, the mold remains closed, the sand core is solidified, the lifting platform descends to drive the lower mold and the lower half of the sand core to descend together and separate from the upper mold, and after the lower mold descends to the position, the ejection mechanism installed in the lower mold operates to stably eject the sand core. The operator or the robot can easily take the finished sand core from the lower space; the lifting platform rises again to perform mold closing and start the next core making period.

[0023] Optionally, the rack is provided with a moving platform moving in the horizontal direction, and the lifting platform is arranged at the moving end of the moving platform.

[0024] By adopting the technical scheme, after the upper mold and the lower mold are separated, the product and the lower mold are transported by the moving platform, and the product is convenient to take.

[0025] Optionally, the rack is provided with a sliding rail, a first mounting frame and a second mounting frame, the first mounting frame and the second mounting frame can move along the sliding rail, the sand shooting box is slidingly connected to the first mounting frame, and the second mounting frame is slidingly connected with a top box, reset springs are arranged between the sand shooting box and the first mounting frame and between the top box and the second mounting frame, the reset springs force the sand shooting box and the top box to move upward, and the rack is provided with a power source, and the power source can exert a downward thrust on the sand shooting box and the top box.

[0026] By adopting the technical scheme, one power source can control two components (the sand shooting box and the top box) to act as required. Through ingenious mechanical design, when the power source is pressed downward, the force of one spring is first overcome to complete one action, and then the force of another spring is overcome to complete the next action, so that time sequence control is realized. When the power source is withdrawn, the two components are automatically and reliably reset under the action of the respective reset springs, without the need for an additional driving device.

[0027] To sum up, the present application has at least one of the following beneficial technical effects:

[0028] The air pressure balancing assembly can dynamically adjust the opening pressure threshold according to the real-time weight of the sand particles in the storage bin. When the sand particles are fully loaded at the initial sand shooting stage, a higher air pressure is required to lift the blocking plate, thereby ensuring strong initial sand shooting power. As the sand particles decrease, the opening threshold linearly decreases, and the air pressure is adjusted accordingly, thereby providing relatively stable and uniform sand shooting pressure throughout the sand shooting process, avoiding the filling defects caused by sudden pressure drop. Furthermore, the spiral groove design inside the nozzle causes the sand flow to rotate at high speed, and the centrifugal force uniformly distributes the sand particles to the outer periphery, thereby completely breaking the inherent uneven distribution problem of the dense center and sparse edge of the air-sand flow. Finally, the rotating kinetic energy is converted into axial kinetic energy through the aggregation part, and the high-quality jet is ejected with uniform distribution and directional high speed, thereby ensuring that every corner in the core box can be fully and densely filled, and greatly improving the forming quality and dimensional accuracy consistency of the sand core. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a schematic view of the overall structure of embodiment 1 of the present application;

[0030] Figure 2 is a rear view of the present application Figure 1 ;

[0031] Figure 3 is a schematic view of the overall structure of the first mounting frame and the second mounting frame in embodiment 1 of the present application;

[0032] Figure 4 is a schematic diagram of the overall structure of the sand shooting box in Embodiment 1 of the present application;

[0033] Figure 5 is a schematic diagram of the overall structure of the air pressure balancing assembly and the connecting assembly in Embodiment 1 of the present application;

[0034] Figure 6 is a sectional view of Embodiment 1 of the present application; Figure 5

[0035] Figure 7 is a schematic diagram of the overall structure of the fluid distributor in Embodiment 1 of the present application;

[0036] Figure 8 is a schematic diagram of the overall structure of the nozzle in Embodiment 1 of the present application;

[0037] Figure 9 is a schematic diagram of the overall structure of Embodiment 2 of the present application.

[0038] BRIEF DESCRIPTION OF DRAWINGS 1, frame; 11, first mounting bracket; 12, second mounting bracket; 13, slide rail; 2, sand storage hopper; 3, sand shooting box; 31, nozzle; 311, spiral part; 312, gathering part; 32, table part; 33, connecting assembly; 331, fluid distributor; 3311, fluid distribution channel; 3312, frustum; 3313, first pipe; 3314, second pipe; 3315, first spring; 3316, guide column; 3317, extension plate; 3318, pressing rod; 332, connecting body; 3321, first channel; 3322, second channel; 34, air pressure balancing assembly; 341, upper cavity; 342, lower cavity; 343, blocking plate; 344, annular protrusion; 345, air pressure chamber; 35, storage chamber; 36, barrel part; 4, top box; 41, top rod; 5, air source; 6, power source; 7, core box; 71, upper mold; 72, lower mold; 8, lifting platform; 9, moving platform; 91, guide rail; 92, moving plate. DETAILED DESCRIPTION

[0039] The present application will be described in further detail below. Embodiments of the present application disclose a core shooter. Figure 1 - the drawings Figure 9 The present application will be described in further detail below. Embodiments of the present application disclose a core shooter.

[0040] Embodiment 1, refer to Figure 1 and Figure 2 ​A core shooting machine comprises a frame 1, a pneumatic source 5, a sand storage hopper 2, a core box 7, a top box 4, a sand shooting box 3, a nozzle 31, a power source 6, and a lifting platform 8, wherein the power source 6, the pneumatic source 5 and the sand storage hopper 2 are fixedly connected to the top end of the frame 1, the power source 6 in embodiment 1 is taken as an example of a hydraulic push rod, the core box 7 comprises an upper mold 71 and a lower mold 72, the upper mold 71 is fixedly connected to the frame 1 by bolts, the lower mold 72 is installed on the lifting platform, the top box 4 and the sand shooting box 3 are located at the intermediate position between the core box 7 and the sand storage hopper 2, the top box 4 and the sand shooting box 3 can move relative to the frame 1, and the top box 4 and the sand shooting box 3 can be displaced above the core box 7, the sand shooting box 3 can be displaced below the sand shooting box 3, the nozzle 31 is installed at the bottom end of the sand shooting box 3, the pneumatic source 5 is communicated with the sand shooting box 3, and the pneumatic source 5 in embodiment 1 is taken as an example of an air pump, and the top box 4 is fixedly connected with a top rod 41 at the bottom end.

[0041] When the sand shooting box 3 moves below the sand storage hopper 2, the sand storage hopper 2 transports sand particles into the sand shooting box, the sand shooting box moves above the core box 7 after the sand shooting box is filled with sand, the output end of the power source 6 is extended to push the sand shooting box 3 to move downward, so that the sand shooting box 3 abuts against the core box 7, the nozzle 31 penetrates into the sand injection port of the core box 7, and the sand particles in the sand shooting box 3 are sprayed into the core box 7 under the action of the pneumatic source 5, when the sand particles are melted and formed, the lifting platform 8 moves downward to separate the upper mold 71 and the lower mold 72, since the sand particle melting product is adhered to the upper mold 71, at this time, the top box 4 moves above the upper mold 71, the power source 6 pushes the top box 4 to move downward, the top box 4 is provided with the top rod 41 at the bottom end, the product is pushed out through the sand injection port by the top rod 41, and the demolding effect of the product is realized.

[0042] With reference to Figure 3 And Figure 4 The frame 1 is fixedly connected with a sliding rail 13, the sliding rail 13 is slidingly connected with a first mounting bracket 11 and a second mounting bracket 12, the sand shooting box 3 is slidingly connected to the first mounting bracket 11, and the top box 4 is slidingly connected to the second mounting bracket 12, the sand shooting box 3 and the top box 4 can move in the vertical direction relative to the first mounting bracket 11 and the second mounting bracket 12, a reset spring is arranged between the sand shooting box 3 and the first mounting bracket 11 and between the top box 4 and the second mounting bracket 12, and the reset spring forces the sand shooting box 3 and the top box 4 to move upward. When the output end of the power source 6 pushes the sand shooting box 3 / the top box 4 to move downward, the reset spring is compressed to provide power for resetting the sand shooting box 3 / the top box 4.

[0043] With reference to Figure 3, the first mounting frame 11 and the second mounting frame 12 are connected through a rod member / plate member, so that the distance between the first mounting frame 11 and the second mounting frame 12 remains unchanged, the horizontal movement of the first mounting frame 11 and the second mounting frame in embodiment 1 is pushed by the hydraulic push rod, so that when the sand shooting box 3 is in the sand filling process, the top box 4 is just located above the core box 7, so that the filling time can be effectively utilized, and the production process time is shortened.

[0044] With reference to Figure 4 and Figure 5 , the sand shooting box 3 in embodiment 1 is composed of a table part 32 and a cylinder part 36, and the sand shooting box 3 is provided with a connecting assembly 33, the connecting assembly 33 includes a flow dividing body 331 and a connecting body 332, the flow dividing body 331 is in sliding connection with the cylinder part 36, and the flow dividing body 331 and the cylinder part 36 are movably sealed, the bottom wall of the flow dividing body 331 is provided with a plurality of flow dividing channels 3311, the flow dividing channels 3311 in embodiment 1 are inverted conical grooves, the bottom wall of the flow dividing body is provided with a right conical platform 3312, and the flow dividing channels 3311 are distributed at equal angles around the conical platform 3312. The inner wall of the cylinder part 36 and the inner wall of the flow dividing body 331 surround a storage bin 35.

[0045] With reference to Figure 5 , the table part 32 is internally provided with the connecting assembly 33 and a gas pressure balancing assembly 34, the input end of the gas pressure balancing assembly 34 is connected with the gas source 5, the output end is connected with the connecting assembly 33, and the connecting assembly 33 is also connected with a gas nozzle and the storage bin 35.

[0046] With reference to Figure 6 , the gas pressure balancing assembly 34 includes a gas pressure bin 345 and a blocking plate 343, the gas pressure bin 345 is internally provided with an annular protrusion 344, the annular protrusion 344 can abut against the blocking plate 343, the number of the annular protrusions 344 in embodiment 1 is 2, which are located below the blocking plate 343, the blocking plate 343 divides the gas pressure bin 345 into an upper cavity 341 and a lower cavity 342, when the blocking plate 343 is separated from the annular protrusion 344, the upper cavity 341 and the lower cavity 342 are communicated, and when the blocking plate 343 abuts against the annular protrusion 344, the upper cavity 341 and the lower cavity 342 are isolated.

[0047] The gas source 5 is communicated with the lower cavity 342, and the gas pressure cavity in embodiment 1 is an annular bin body, the gas source 5 is connected with a plurality of connection points of the gas pressure cavity, and the connection points are distributed at equal angles in the gas pressure cavity, so that when the gas source 5 is started, the high-pressure gas flow will first enter the lower cavity 342, so that the gas pressure in the lower cavity 342 reaches a threshold value, the gas pressure lifts the blocking plate 343, so that the upper cavity 341 and the lower cavity 342 are communicated, and the high-pressure gas flow can uniformly enter the upper cavity 341.

[0048] With reference to Figure 6, the connector 332 is provided with a plurality of connecting channels, each connecting channel comprises a first channel 3321 in vertical direction and a second channel 3322 in inclined direction, the first channel 3321 is communicated with the second channel 3322, the second channel 3322 is inclined upward, one end of the first channel 3321 is communicated with the upper cavity 341, and the other end is communicated with the nozzle 31, the second channel 3322 is fixedly connected with the second pipe 3314 at an entering end, the shunt body 331 is fixedly connected with the first pipe 3313, the first pipe 3313 is communicated with the shunt channel 3311, the first pipe 3313 is sleeved with the second pipe 3314, and the second pipe 3314 is provided with an electric control switch in the embodiment 1, and the electric control switch can control the opening and closing state of the second pipe 3314.

[0049] The high-pressure airflow flows from the upper cavity 341 to the first channel 3321, and moves in the first channel 3321 to the nozzle 31, according to Bernoulli's principle, the second channel 3322 generates negative pressure, so that the sand particles easily enter the second channel 3322, effectively preventing the sand particles from being blocked, and the sand particles enter the first channel 3321 and move to the nozzle 31 under the action of the high-pressure airflow, and are filled into the sand core through the nozzle 31.

[0050] Reference Figure 7 The shunt body 331 is fixedly connected with an extension plate 3317 outside, 12 groups of guide columns 3316 are fixedly connected on the connector 332, the guide columns 3316 are annularly distributed at equal angles on the top surface of the connector 332, the guide columns 3316 are provided with guide portions, the guide portions are slidably connected with the extension plate 3317, the guide columns 3316 are sleeved with first springs 3315, the first springs 3315 force the shunt body 331 to move downward, the extension plate 3317 is fixedly connected with a pressing rod 3318, and the pressing rod 3318 is fixedly connected with the blocking plate 343.

[0051] In a normal state, the blocking plate 343 abuts against the annular protrusion 344, at this time, in order to open the blocking plate 343 to communicate the upper cavity 341 and the lower cavity 342, the opening threshold value of the blocking plate 343 = the pressure of the first spring 3315 + the gravity of the shunt body 331 + the gravity of other components; when the sand shooting box 3 is filled with sand particles, the opening threshold value of the blocking plate 343 = the pressure of the first spring 3315 + the gravity of the shunt body 331 + the gravity of other components + the gravity of the sand particles in the storage bin 35; the air pressure in the upper cavity 341 is equal to the pressure threshold value of the blocking plate 343, and the gravity of the sand particles in the storage bin 35 is reduced during the sand shooting process, so that the threshold value of the blocking plate 343 is also constantly reduced, and the sand shooting pressure of the nozzle is also constantly reduced.

[0052] Reference Figure 8The nozzle 31 comprises a nozzle body and a flow channel, the nozzle body is externally provided with a connecting part matched with the connecting channel, the flow channel internally comprises a spiral part 311 and an accumulation part, the spiral part 311 is communicated with the accumulation part, the spiral part 311 is communicated with the connecting channel, the spiral part 311 is provided with a plurality of spiral grooves, the inclination angle of the spiral grooves is 70-80 degrees, under the action of the high-pressure airflow, the sand particles outside the sand particle flow move to the periphery along the spiral grooves, and the natural distribution state that the sand particle concentration is high in the center of the airflow and low at the edge is broken; in the embodiment 1, the accumulation part is a necked part, one side with a larger flow area is communicated with the spiral part 311, the tangential velocity component of the sand particles around the sand particle flow is rapidly attenuated due to the constraint and friction of the pipe wall, the rotational kinetic energy is converted into axial kinetic energy and internal energy, and a high-quality air-sand jet flow which is uniformly distributed and mainly moves at a high speed in the axial direction is sprayed out of the outlet of the accumulation part.

[0053] The implementation principle of the core shooting machine in the embodiment of the application is as follows: first, in the initial position, the sand storage hopper 2 is fixed on the top of the machine frame 1, the sand shooting box 3 is moved to the position below the sand storage hopper 2 to receive sand particles, and sand filling is completed. At the same time, the top box 4 is located above the core box 7 in standby mode, and this layout fully utilizes time and shortens the cycle period.

[0054] Subsequently, the sand shooting box 3 is horizontally moved to the position above the core box 7, the hydraulic push rod is used as the power source 6 to push the sand shooting box 3 to be pressed downward, so that the sand shooting box 3 is tightly abutted against the core box 7, and the nozzle 31 is inserted into the sand injection port of the core box 7. The air power source 5 is started, high-pressure airflow is transmitted to the inside of the sand shooting box 3 through the connecting assembly 33 after being regulated by the air pressure balance assembly 34. In this process, the air pressure balance assembly 34 dynamically adjusts the airflow pressure according to the weight of the sand particles: when the sand shooting box 3 is fully loaded with sand particles, the opening pressure threshold of the blocking plate 343 is relatively high; as the sand shooting proceeds and the sand particles decrease, the threshold is lowered, and the air pressure is adjusted accordingly, so that stable sand shooting pressure is realized.

[0055] During sand shooting, the high-pressure airflow generates a negative pressure effect through the connecting channel, so as to promote the sand particles to enter the airflow and be transported to the nozzle 31. The spiral groove structure in the nozzle 31 enables the sand particle flow to produce rotational motion, breaks the problem of uneven distribution that the concentration is high in the center and low at the edge, and then forms a uniform and high-speed air-sand jet flow through the accumulation part, so as to be injected into the core box 7 for forming.

[0056] After sand shooting is completed, the sand particles are solidified in the core box 7. The lifting platform 8 drives the lower mold 72 to be lowered, so as to realize mold parting. The formed sand core is often adhered to the upper mold 71, at this time, the top box 4 is moved to the position directly above the upper mold, the hydraulic push rod pushes the top box 4 to be pressed downward, the sand core is ejected through the injection port by the ejector rod 41, and demolding is completed. The sand shooting box 3 and the top box 4 are automatically returned to the original positions under the action of the reset spring, and are ready for the next cycle.

[0057] In the embodiment 2, reference is made to Figure 9The difference between the embodiment 1 and the embodiment 2 is that the rack 1 is provided with a moving platform 9 moving in the horizontal direction, the lifting platform 8 is arranged at the moving end of the moving platform 9, the moving platform 9 comprises two guide rails 91, a moving plate 92 slidably connected to the guide rails 91, and a hydraulic push rod driving the moving plate 92 to move, and the lifting platform 8 is installed on the moving platform 9, so that the lower mold 72 is convenient for unloading the molded products.

[0058] The above are the preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, therefore: all equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A core shooter characterized by: The utility model relates to a sand shooting device, including, Frame (1) is equipped with the pneumatic source (5) of providing high pressure airflow, sand storage hopper (2) for storing sand particles and core box (7), Sand shooting box (3) is installed in frame (1) and can communicate with sand storage hopper (2) and core box (7) respectively, and storage bin (35) for storing sand particles is arranged in sand shooting box (3), Connecting assembly (33) is equipped with connecting channel, and connecting channel is connected with storage bin (35), nozzle (31) and air pressure balance assembly (34) respectively, the input end of air pressure balance assembly (34) is connected with pneumatic source (5), and the output end is connected with connecting assembly (33), Air pressure balance assembly (34) includes air pressure bin (345) and blocking plate (343), and annular protrusion (344) is arranged in air pressure bin (345), annular protrusion (344) can abut with blocking plate (343), and blocking plate (343) divides air pressure bin (345) into upper cavity (341) and lower cavity (342), when blocking plate (343) is separated from annular protrusion (344), upper cavity (341) and lower cavity (342) are communicated, when blocking plate (343) abuts with annular protrusion (344), upper cavity (341) and lower cavity (342) are isolated, Connecting assembly (33) includes shunt body (331) and connecting body (332), shunt body (331) is slidably connected with sand shooting box (3), shunt body (331) and the inside of sand shooting box (3) enclose storage bin (35), shunt body (331) is equipped with a plurality of shunt channels (3311), connecting channel is arranged in connecting body (332), and shunt channel (3311) is communicated with connecting channel, Shunt body (331) is equipped with pressure rod (3318), pressure rod (3318) penetrates one side of air pressure bin (345) and is fixedly connected with blocking plate (343), and first spring (3315) is arranged in sand shooting box (3), and first spring (3315) exerts downward thrust to shunt body (331).

2. A core shooter as claimed in claim 1, characterized in that: Shunt body (331) is fixedly connected with first pipeline (3313), connecting body (332) is fixedly connected with second pipeline (3314), first pipeline (3313) and second pipeline (3314) are sleeved, and first pipeline (3313) or second pipeline (3314) is equipped with electric control switch, first pipeline (3313) is communicated with shunt channel (3311), and second pipeline (3314) is communicated with connecting channel.

3. A core shooter as claimed in claim 2, characterized in that: Connecting channel is multidirectional channel, and connecting channel includes vertical first channel (3321) and inclined second channel (3322), first channel (3321) is communicated with second channel (3322), first channel (3321) is communicated with upper cavity (341) and nozzle (31) respectively, and second channel (3322) is communicated with shunt channel (3311).

4. A core shooter as claimed in either of claims 1 or 3, characterised in that: Nozzle (31) includes nozzle body and flow channel, the outer side of nozzle body is equipped with connecting part matched with connecting channel, the flow channel includes spiral part (311) and gathering part, spiral part (311) is communicated with gathering part, and spiral part (311) is communicated with connecting channel.

5. A core-assembly machine according to any one of claims 1, characterized in that: The core box (7) comprises an upper die (71) and a lower die (72), the upper die (71) is fixedly connected with the rack (1), the rack (1) is provided with a lifting platform (8), and the lower die (72) is fixedly connected with the lifting platform (8).

6. A core shooter as claimed in claim 5, characterized in that: The rack (1) is provided with a moving platform (9) moving in a horizontal direction, and the lifting platform (8) is arranged at a moving end of the moving platform (9).

7. A core-assembly machine according to any one of claims 1, characterized in that: The rack (1) is provided with a slide rail (13), a first mounting frame (11) and a second mounting frame (12), the first mounting frame (11) and the second mounting frame (12) can move along the slide rail (13), the sand shooting box (3) is slidably connected with the first mounting frame (11), the second mounting frame (12) is slidably connected with the top box (4), reset springs are arranged between the sand shooting box (3) and the first mounting frame (11) and between the top box (4) and the second mounting frame (12), the reset springs force the sand shooting box (3) and the top box (4) to move upwards, the rack (1) is provided with a power source (6), and the power source (6) can exert a downward thrust on the sand shooting box (3) and the top box (4).

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