Exhaust silencer for core making machine and core making machine

Abstract

The invention discloses an exhaust silencing device for a core making machine and the core making machine, and relates to the technical field of exhaust silencing, the exhaust silencing device comprises a silencing module which defines an exhaust channel, a flow control module comprises a seat body and a throttling sliding block, an air inlet channel is formed in the seat body, the air inlet channel is communicated with the exhaust channel, and the throttling sliding block is arranged in the seat body; an exhaust hole in the same extending direction as the air inlet channel is formed in the throttling sliding block, the cross sectional area of the exhaust hole is smaller than that of the air inlet channel, and when the throttling sliding block is located at the first position, at least part of the throttling sliding block moves into the air inlet channel to shield at least part of the air inlet channel; the exhaust hole is located in the air inlet channel so that air flowing into the air inlet channel can flow to the exhaust channel through the exhaust hole, and under the condition that the throttling sliding block is located at the second position, the throttling sliding block moves out of the air inlet channel. Therefore, the sand shooting exhaust noise can be reduced, the damage of sand grains in the gas to the internal structure of the silencing module can be weakened, and the service life of the silencing module is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of exhaust silencing, in particular to an exhaust silencing device for a core making machine and the core making machine. BACKGROUND

[0002] In the related art, the core making machine is the main equipment for sand core production in the foundry industry. In the production process, the compressed air remaining in the shooting cavity after shooting needs to be discharged quickly to ensure that the mold is opened under zero pressure and to avoid the sand being blown off when the mold is opened. The exhaust silencing device is the final discharge outlet of the compressed air, which functions to reduce the high-frequency noise generated during exhaust. However, a very large airflow impact can be generated in the exhaust pipeline at the moment when the exhaust valve is opened, which is difficult to achieve the ideal silencing effect even under the noise reduction effect of the silencing module. Meanwhile, a certain amount of sand particles are mixed in the discharged gas, which can cause serious damage to the internal structure of the exhaust silencing device under the driving of high-speed airflow, thereby directly reducing the service life of the exhaust silencing device. SUMMARY

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present application is to provide an exhaust silencing device for a core making machine, which can effectively reduce the noise generated during sand shooting and exhaust, and at the same time, due to the reduction of pressure, the damage of sand particles in the gas to the internal structure of the silencing module is also weakened, thereby prolonging the service life of the silencing module.

[0004] The present application further provides a core making machine having the above-mentioned exhaust silencing device for a core making machine.

[0005] The exhaust silencing device for a core making machine according to the embodiments of the present application comprises: a silencing module, the silencing module defining an exhaust passage; a flow control module, the flow control module comprising a seat body and a throttling slider, the seat body being formed with an air inlet passage, the air inlet passage being in communication with the exhaust passage, the throttling slider being formed with an exhaust hole extending in the same direction as the air inlet passage, the cross-sectional area of the exhaust hole being smaller than that of the air inlet passage, the throttling slider being slidably arranged in the seat body in the radial direction of the air inlet passage so as to be moved to a first position and a second position relative to the seat body, at least part of the throttling slider being moved into the air inlet passage to block at least part of the air inlet passage and the exhaust hole being located in the air inlet passage so that the gas flowing into the air inlet passage flows to the exhaust passage through the exhaust hole when the throttling slider is located at the first position, the throttling slider being moved out of the air inlet passage when the throttling slider is located at the second position.

[0006] According to the exhaust silencing device for the core making machine, the exhaust hole is formed in the throttle sliding block and has the same extension direction as the air inlet channel, the cross-sectional area of the exhaust hole is smaller than that of the air inlet channel, the throttle sliding block is slidably arranged in the seat body along the radial direction of the air inlet channel to move the throttle sliding block to the first position and the second position relative to the seat body, at least part of the throttle sliding block is moved into the air inlet channel to block at least part of the air inlet channel when the throttle sliding block is located at the first position, and the exhaust hole is located in the air inlet channel to make the gas flowing into the air inlet channel flow to the air outlet channel through the exhaust hole, the throttle sliding block is moved out of the air inlet channel when the throttle sliding block is located at the second position, the size of the air inlet channel of the exhaust silencing device can be controlled, the exhaust pressure is reduced, the gas flow rate is slowed down, and the noise generated during the sand exhaust can be effectively reduced, and the damage of the sand particles in the gas to the internal structure of the silencing module is reduced due to the reduced pressure, and the service life of the silencing module is prolonged.

[0007] According to some embodiments of the present application, the seat body is further formed with an assembly hole, the assembly hole is located on one side of the air inlet channel and communicates with the air inlet channel along the radial direction of the air inlet channel, the assembly hole extends along the radial direction of the air inlet channel, the throttle sliding block is slidably arranged in the assembly hole, and the throttle sliding block is located in the assembly hole when the throttle sliding block is located at the second position.

[0008] According to some embodiments of the present application, the inner side wall of the assembly hole is formed with a first guide structure, the throttle sliding block is provided with a second guide structure, and the first guide structure and the second guide structure are guided and matched to guide the throttle sliding block in the radial direction of the air inlet channel.

[0009] According to some embodiments of the present application, the flow control module further comprises a driving structure, the driving structure is arranged in the seat body and is in transmission connection with the throttle sliding block, and the driving structure is used to drive the throttle sliding block to move to the first position or the second position.

[0010] According to some embodiments of the present application, the driving structure is configured to drive the throttle sliding block to move to the second position when the throttle sliding block is located at the first position for a preset delay time after receiving the exhaust signal of the core making machine.

[0011] According to some embodiments of the present application, the silencing module comprises an exhaust pipe and a sound-absorbing layer, the exhaust pipe defines the exhaust channel, the exhaust pipe is formed with a plurality of air holes, and the sound-absorbing layer is annular and sleeved on the exhaust pipe.

[0012] According to some embodiments of the present application, the silencing module further comprises a shell, the exhaust pipe and the sound-absorbing layer are located in the shell, the shell is formed with a communication hole, and the communication hole communicates the exhaust channel and the air inlet channel.

[0013] According to some embodiments of the present application, the shell is further formed with an exhaust port, and the exhaust port and the outlet of the exhaust channel are communicated.

[0014] According to some embodiments of the present application, the exhaust silencing device further comprises a communication pipe, which communicates the communication hole and the air inlet channel.

[0015] The core making machine according to the embodiments of the present application comprises the exhaust silencing device for core making machine according to the above embodiments.

[0016] Additional aspects and advantages of the present application will be made apparent from the following description, which, taken in conjunction with the accompanying drawings, that will be presented as a purely illustrative and non-limiting example. BRIEF DESCRIPTION OF DRAWINGS

[0017] The above and / or additional aspects and advantages of the present application will become apparent and be more readily understood through consideration of the following description, taken in conjunction with the accompanying drawings, in which: Figure 1 is a structural schematic view of the throttling slide moving to the first position according to an embodiment of the present application; Figure 2 is a structural schematic view of the throttling slide moving to the first position according to an embodiment of the present application; Figure 3 is a partial enlarged schematic view of the seat body according to an embodiment of the present application; Figure 4 is a schematic view of the gas flow control principle of the exhaust silencing device according to an embodiment of the present application.

[0018] REFERENCE NUMERALS: Exhaust silencing device 100; Silencing module 10; exhaust channel 11; exhaust pipe 12; sound absorbing layer 13; air hole 14; shell 15; communication hole 16; exhaust port 17; communication pipe 18; metal mesh 19; Flow control module 20; seat body 21; throttling slide 22; air inlet channel 23; exhaust hole 24; assembly hole 25; first guide structure 26; second guide structure 27; air inlet 28; Driving structure 30; time-delay reversing valve 31. DETAILED DESCRIPTION

[0019] The embodiments of the present application are described in detail below with reference to the accompanying drawings, in which the same or similar components have the same or similar reference numerals throughout. The embodiments described below are exemplary only, and are not intended to be limiting of the present application.

[0020] The following description refers to the accompanying drawings. Figures 1-4 Exhaust silencing device 100 for core making machine and core making machine according to embodiments of the present application are described.

[0021] Exhaust silencing device 100 for core making machine according to embodiments of the present application comprises: The muffling module 10 defines an exhaust passage 11. The flow control module 20 includes a seat body 21 and a throttle slide 22. The seat body 21 is formed with an intake passage 23, which is in communication with the exhaust passage 11. The throttle slide 22 is formed with an exhaust hole 24, which is in the same extension direction as the intake passage 23 and has a cross-sectional area smaller than that of the intake passage 23. The throttle slide 22 is slidably arranged in the seat body 21 in the radial direction of the intake passage 23 so as to be moved to a first position and a second position relative to the seat body 21. When the throttle slide 22 is in the first position, at least a part of the throttle slide 22 is moved into the intake passage 23 to block at least a part of the intake passage 23, and the exhaust hole 24 is located in the intake passage 23 so that the gas flowing into the intake passage 23 flows to the exhaust passage 11 through the exhaust hole 24. When the throttle slide 22 is in the second position, the throttle slide 22 is moved out of the intake passage 23.

[0022] The muffling module 10 defines an exhaust passage 11, which can timely and quickly exhaust the compressed air remaining in the shot cavity of the core shooter during production and reduce the high-frequency noise generated during exhaust.

[0023] The flow control module 20 includes a seat body 21 and a throttle slide 22. The seat body 21 is formed with an intake passage 23, which has an intake port 28 in communication with the shot cavity of the core shooter to timely and quickly exhaust the compressed air in the shot cavity into the intake passage 23. The intake passage 23 is in communication with the exhaust passage 11, so that the compressed air can be exhausted after the high-frequency noise is reduced by the muffling module 10, which can significantly improve the working environment, enhance communication and safety, protect the health of employees, reduce noise pollution, and improve the stability of the production process and the reliability of the equipment.

[0024] The throttle slide 22 is formed with an exhaust hole 24 in the same extension direction as the intake passage 23. When the throttle slide 22 is in position with the intake passage 23, the exhaust hole 24 can be smoothly communicated with the intake passage 23. The cross-sectional area of the exhaust hole 24 is smaller than that of the intake passage 23. The exhaust hole 24 can reduce the intake flow of the compressed air through the intake passage 23, thereby reducing the exhaust pressure and speed to reduce the exhaust noise and airflow impact force, which can reduce the damage of the sand particles in the gas to the internal structure of the muffling module 10 and prolong the service life of the muffling module 10.

[0025] The throttle slide 22 is slidably arranged in the seat body 21 in the radial direction of the intake passage 23 so as to be moved to a first position and a second position relative to the seat body 21. As shown in Figure 1 , the throttle slide 22 is in the first position, and as shown in Figure 2As shown, the throttle slide 22 is in the second position, in the case that the throttle slide 22 is in the first position, at least part of the throttle slide 22 moves into the air inlet channel 23 to block at least part of the air inlet channel 23, and the exhaust hole 24 is located in the air inlet channel 23 to make the gas flowing into the air inlet channel 23 flow to the exhaust channel 11 through the exhaust hole 24, and in the case that the throttle slide 22 is in the second position, the throttle slide 22 moves out of the air inlet channel 23.

[0026] Specifically, as shown, Figure 4 As shown, the core making machine can be connected with a controller for receiving the exhaust signal of the core making machine and a time-delay reversing valve 31, the time-delay reversing valve 31 is in communication connection with the flow control module 20 and the controller, and the controller is configured to control the time-delay reversing valve 31 to drive the throttle slide 22 to move to the first position or the second position according to the exhaust signal of the core making machine.

[0027] After the controller receives the shot exhaust signal of the core making machine, the controller controls the time-delay reversing valve 31 to drive the throttle slide 22 to move to the first position, at least part of the throttle slide 22 moves into the air inlet channel 23 to block at least part of the air inlet channel 23, so as to reduce the air inlet flow, and the high-pressure gas remaining in the shot cavity is limited and decompressed through the small diameter port of the exhaust hole 24, when the pressure of the gas remaining in the shot cavity is reduced to below 1 bar, the controller controls the time-delay reversing valve 31 to drive the throttle slide 22 to move to the second position, the throttle slide 22 moves out of the air inlet channel 23, and the large diameter of the air inlet channel 23 is switched to exhaust completely, which can effectively reduce the noise generated during the shot exhaust, and the damage of the sand particles in the gas to the internal structure of the sound elimination module 10 is also reduced due to the reduction of the pressure, thereby prolonging the service life of the sound elimination module 10.

[0028] Further, the present application can adopt a pneumatic time-delay reversing valve 31 to control the position switching of the throttle slide 22, the control signal is pneumatic control, the control gas circuit is synchronous with the exhaust valve control gas circuit of the device itself, the time-delay reversing valve 31 works when the exhaust starts, and the time-delay reversing valve 31 resets when the exhaust ends, so that the device can work only by connecting the exhaust control gas circuit without modifying the original device control system, which is conducive to reducing the optimization cost of the device.

[0029] The time-delay time range of the pneumatic time-delay reversing valve 31 is linearly adjustable between 0.1s-10s, which is convenient for on-site debugging, and can realize the switching of the large and small diameters of the air inlet channel 23 in cooperation with the flow control module 20, the flow control module 20 and the sound elimination module 10 can both adopt high-strength wear-resistant materials, which have long service life and are convenient to maintain, and can effectively improve the sound elimination effect and service life of the exhaust sound elimination module 10.

[0030] According to the exhaust silencing device 100 for the core making machine, the exhaust hole 24 is formed in the throttle sliding block 22 and has the same extending direction as the air inlet channel 23, the cross-sectional area of the exhaust hole 24 is smaller than that of the air inlet channel 23, the throttle sliding block 22 is slidably arranged in the seat body 21 along the radial direction of the air inlet channel 23 to move the throttle sliding block 22 to the first position and the second position relative to the seat body 21, at least part of the throttle sliding block 22 is moved into the air inlet channel 23 to shield at least part of the air inlet channel 23 when the throttle sliding block 22 is located at the first position, and the exhaust hole 24 is located in the air inlet channel 23 to make the gas flowing into the air inlet channel 23 flow to the exhaust channel 11 through the exhaust hole 24, the throttle sliding block 22 is moved out of the air inlet channel 23 when the throttle sliding block 22 is located at the second position, the size of the air inlet channel 23 of the exhaust silencing device 100 can be controlled, the exhaust pressure is reduced, the gas flow rate is slowed down, and the noise generated during the sand exhaust can be effectively reduced. At the same time, the damage of the sand particles in the gas to the internal structure of the silencing module 10 is also weakened due to the reduction of the pressure, and the service life of the silencing module 10 is prolonged.

[0031] According to some embodiments of the present application, as shown in Figure 1 and Figure 2 , the seat body 21 is further formed with an assembly hole 25, which is located on one side of the air inlet channel 23 and communicates with the air inlet channel 23 along the radial direction of the air inlet channel 23, and the assembly hole 25 extends along the radial direction of the air inlet channel 23, the throttle sliding block 22 is slidably arranged in the assembly hole 25, and the throttle sliding block 22 is located in the assembly hole 25 when the throttle sliding block 22 is located at the second position.

[0032] , the seat body 21 is further formed with an assembly hole 25, which is located on one side of the air inlet channel 23 and communicates with the air inlet channel 23 along the radial direction of the air inlet channel 23, and the assembly hole 25 extends along the radial direction of the air inlet channel 23, the throttle sliding block 22 is slidably arranged in the assembly hole 25, and the throttle sliding block 22 is located in the assembly hole 25 when the throttle sliding block 22 is located at the second position.

[0033] According to some embodiments of the present application, as shown in Figure 2 and Figure 3 , the inner side wall of the assembly hole 25 is formed with a first guide structure 26, the throttle sliding block 22 is provided with a second guide structure 27, and the first guide structure 26 and the second guide structure 27 are guided and matched to guide the throttle sliding block 22 in the radial direction of the air inlet channel 23.

[0034] The first guide structure 26 can be configured as one of a guide column or a guide groove, and the second guide structure 27 can be configured as the other one of the guide column or the guide groove, which can be reasonably selected and arranged according to actual conditions. As a specific embodiment of the present application, the first guide structure 26 can be configured as a guide column, and the second guide structure 27 can be configured as a guide groove. The guide column is assembled in the guide groove, the guide groove extends along the extension direction of the assembly hole 25, and the guide column moves along the extension direction of the guide groove to guide the throttle slide 22 in the radial direction of the air inlet channel 23, which can ensure that the throttle slide 22 stably and smoothly moves along the preset path in the assembly hole 25, thereby improving the working stability of the flow control module 20 and ensuring the repeatability and stability of the exhaust silencing device 100 during the working process. It can also reduce abnormal wear between the throttle slide 22 and the seat body 21, thereby effectively prolonging the service life of the exhaust silencing device 100.

[0035] According to some embodiments of the present application, as shown in Figure 1 Good Figure 2 The flow control module 20 further comprises a driving structure 30, which is arranged on the seat body 21 and in transmission connection with the throttle slide 22. The driving structure 30 is used to drive the throttle slide 22 to move to the first position or the second position.

[0036] The driving structure 30 can be configured as a cylinder, a motor or other types of driving structure 30, which can be reasonably selected and arranged according to actual conditions. The controller can be in communication connection with the driving structure 30. The controller controls the driving structure 30 to drive the throttle slide 22 to move according to the exhaust signal of the core making machine, which can provide reliable and stable driving force for the throttle slide 22 and ensure the certainty and reliability of the action execution of the throttle slide 22.

[0037] According to some embodiments of the present application, the driving structure 30 is configured to drive the throttle slide 22 to move to the second position when the throttle slide 22 is located at the first position for a preset delay time after receiving the exhaust signal of the core making machine.

[0038] The core making machine can be connected with a controller and a delay reversing valve 31. The controller is used to receive the exhaust signal of the core making machine. The delay reversing valve 31 is in communication connection with the flow control module 20 and the controller. The controller is configured to control the delay reversing valve 31 to drive the throttle slide 22 to move to the first position or the second position according to the exhaust signal of the core making machine.

[0039] After the controller receives the sand shooting exhaust signal of the core making machine, the controller controls the delay reversing valve 31 to make the drive structure 30 drive the throttle slider 22 to move to the first position, at least part of the throttle slider 22 moves into the air inlet channel 23 to block at least part of the air inlet channel 23 to reduce the air inlet flow, and the small diameter port of the exhaust hole 24 limits the flow and reduces the pressure of the residual high-pressure gas in the shooting cavity. When the pressure of the residual gas in the shooting cavity is reduced to below 1 bar (the delay time required for the pressure of the residual gas in the shooting cavity to be reduced to below 1 bar), the controller controls the delay reversing valve 31 to make the drive structure 30 drive the throttle slider 22 to move to the second position, the throttle slider 22 moves out of the air inlet channel 23, and switches to the large diameter of the air inlet channel 23 for complete exhaust. This can effectively reduce the noise generated during sand shooting and exhaust, and also reduces the damage of the sand particles in the gas to the internal structure of the sound attenuation module 10, thereby prolonging the service life of the sound attenuation module 10.

[0040] Further, as a specific embodiment of the present application, the exhaust cycle duration is generally within 3s, and it takes about 0.5s (delay time) to reduce the residual pressure to below 1 bar through small-diameter exhaust.

[0041] According to some embodiments of the present application, as shown in Figure 1 and Figure 2 The sound attenuation module 10 comprises an exhaust pipe 12 and a sound absorption layer 13, the exhaust pipe 12 defines an exhaust channel 11, the exhaust pipe 12 is formed with a plurality of air holes 14, and the sound absorption layer 13 is annular and sleeved on the exhaust pipe 12.

[0042] The exhaust pipe 12 defines the exhaust channel 11, and the exhaust channel 11 communicates with the air inlet channel 23 to exhaust the compressed air generated by the core making machine. The exhaust pipe 12 is formed with a plurality of air holes 14. In some embodiments of the present application, the exhaust pipe 12 can be formed with two, three, four or the like number of air holes 14, but the present application is not limited thereto. The exhaust pipe 12 can also be formed with other numbers of air holes 14, as long as the exhaust pipe 12 is formed with a plurality of air holes 14.

[0043] The sound absorption layer 13 is annular and sleeved on the exhaust pipe 12. When the high-pressure airflow enters the outer sound absorption layer 13 from the exhaust passage 11 in the exhaust pipe 12 through the plurality of air holes 14, the process is equivalent to suddenly entering a large flow passage into a large number of small flow passages. The sudden change of sound impedance reflects and consumes part of the energy of the middle and low frequency sound waves. At the same time, the airflow itself is diffused and decelerated, reducing the regenerative noise caused by the airflow impact. The sound waves diffused to the sound absorption layer 13 force the air molecules in the micropores in the sound absorption layer 13 material to vibrate. The vibration friction efficiently converts the sound energy (mechanical energy) into heat energy and dissipates it, so that the sound absorption module 10 can cope with the noise in a wide frequency range generated by the compressed air exhaust, and improve the noise reduction effect.

[0044] The exhaust pipe 12 not only plays a guiding role, but also can be used as a protective cover to prevent the high-speed airflow from directly impacting the fragile sound absorption layer 13, thereby avoiding the sound absorption from being blown away, worn and powdered, and greatly prolonging the service life of the sound absorption module 10.

[0045] Further, the exhaust pipe 12 can also be replaced by a metal mesh 19 structure. The metal mesh 19 is composed of a large number of “microscopic” holes. When the airflow passes through the metal mesh 19, it is divided into a large number of extremely fine vortexes. The airflow in the exhaust passage 11 passes through the metal mesh 19 to the sound absorption layer 13. The change of the flow passage section is more drastic and frequent, and the reflection and interference of the sound waves are stronger (resistance noise reduction is enhanced). The metal mesh 19 hardly constitutes a barrier, and the sound waves can almost unobstructedly penetrate the entire circumference of the metal mesh 19 into the outer sound absorption layer 13, so that the sound waves are better absorbed and dissipated (the resistance noise reduction efficiency is maximized), thereby making the exhaust airflow more stable and soft, and also more effectively preventing the sound absorption layer 13 from being blown out or sucked back into the exhaust passage 11 through the holes, thereby polluting the system or causing material loss.

[0046] According to some embodiments of the present application, as shown in Figure 1 The sound absorption module 10 further includes a shell 15. The exhaust pipe 12 and the sound absorption layer 13 are located in the shell 15. The shell 15 is formed with a communication hole 16. The communication hole 16 communicates the exhaust passage 11 and the air inlet passage 23.

[0047] The shell 15 integrates the loose components such as the exhaust pipe 12 and the sound absorption layer 13 in the interior into a solid whole module, so that the sound absorption module 10 can be conveniently carried, installed and fixed on the seat body 21, and can withstand certain mechanical impact and vibration. The shell 15 and the exhaust pipe 12 and the sound absorption layer 13 together enclose a closed chamber, preventing the sound waves and airflow from being uncontrollably leaked, ensuring that all exhausts must pass through the predetermined sound absorption path (such as entering the sound absorption layer 13 through the air holes 14 of the exhaust pipe 12), thereby maximizing the effect of the sound absorption layer 13 material.

[0048] The communication hole 16 on the shell 15 is the inlet of the sound attenuation module 10, which receives the airflow adjusted by the flow control module 20, forms a clear airflow path, and ensures the stable discharge of the airflow.

[0049] According to some embodiments of the present application, as shown in Figure 1 The shell 15 is also formed with an exhaust port 17, which is in communication with the outlet of the exhaust passage 11.

[0050] The exhaust port 17 can be directly communicated with the outside, or the exhaust port 17 can be communicated with other devices that need to utilize the airflow, so as to realize the reuse of the airflow, and reasonable selection and setting can be made according to actual conditions. The exhaust port 17 is in communication with the outlet of the exhaust passage 11, so that the airflow after being attenuated by the exhaust sound attenuation device 100 can be discharged in sequence through the exhaust passage 11 and the exhaust port 17, so that the performance of the sound attenuation module 10 reaches the design expectation.

[0051] According to some embodiments of the present application, as shown in Figure 1 Figure 1 The exhaust sound attenuation device 100 further comprises a communication pipe 18, which is in communication with the communication hole 16 and the air inlet passage 23.

[0052] The communication pipe 18 serves as a communication bridge between the sound attenuation module 10 and the flow control module 20, which can ensure that the high-pressure noise airflow can be accurately, reliably and leak-free guided from the air inlet passage 23 to the inside of the sound attenuation module 10, so as to start the entire sound attenuation process. And the sound attenuation module 10 and the flow control module 20 can be designed and manufactured as an independent and standardized component, which improves the maintainability of the equipment.

[0053] Further, the use steps of the exhaust sound attenuation device 100 of the present application can be: the controller receives the exhaust signal and controls the time delay reversing valve 31 to start timing work, and the controller controls the driving structure 30 to drive the throttle slider 22 to move to the first position, so that the airflow enters the sound attenuation module 10 through the small-diameter exhaust hole 24, and the residual high-pressure gas in the shooting cavity is throttled and decompressed. When the pressure of the residual gas in the shooting cavity is reduced to below 1 bar (the timing time of the time delay reversing valve 31 is up), the controller controls the time delay reversing valve 31 to drive the throttle slider 22 to move to the second position, and the throttle slider 22 moves out of the air inlet passage 23, and switches to the large-diameter of the air inlet passage 23 for complete exhaust. After the controller receives the exhaust end signal, the controller controls the time delay reversing valve 31 to reset, and controls the driving structure 30 to drive the throttle slider 22 to move to the first position, and the cycle is ended. Thus, the noise generated during the sand exhaust can be effectively reduced, and the damage of the sand particles in the gas to the internal structure of the sound attenuation module 10 is also reduced due to the reduction of the pressure, which prolongs the service life of the sound attenuation module 10.

[0054] The core making machine according to the embodiment of the present application comprises the exhaust silencing device 100 for the core making machine according to the above-mentioned embodiments, the exhaust hole 24 is formed in the throttle slide 22 and has the same extending direction as the air inlet channel 23, the cross-sectional area of the exhaust hole 24 is smaller than the cross-sectional area of the air inlet channel 23, the throttle slide 22 is slidably arranged in the seat body 21 along the radial direction of the air inlet channel 23 so that the throttle slide 22 is moved to the first position and the second position relative to the seat body 21, in the case that the throttle slide 22 is located at the first position, at least part of the throttle slide 22 is moved into the air inlet channel 23 to block at least part of the air inlet channel 23, and the exhaust hole 24 is located in the air inlet channel 23 so that the gas flowing into the air inlet channel 23 flows to the exhaust channel 11 through the exhaust hole 24, in the case that the throttle slide 22 is located at the second position, the throttle slide 22 is moved out of the air inlet channel 23, the size of the air inlet channel 23 of the exhaust silencing device 100 can be controlled, the exhaust pressure is reduced, the gas flow rate is slowed down, and thus the noise generated when the sand is shot and the exhaust is produced can be effectively reduced, at the same time, the damage of the sand particles in the gas to the internal structure of the silencing module 10 is weakened due to the reduction of the pressure, and the service life of the silencing module 10 is prolonged. The working environment can be significantly improved, the communication and safety are improved, the health of the employees is protected, the noise pollution is reduced, and the stability of the production process and the reliability of the core making machine are improved.

[0055] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above-mentioned terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0056] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. An exhaust silencer for a core making machine, characterized in that, The muffling module defines an exhaust passage. The flow control module includes a seat body and a throttle slider, the seat body is formed with an air inlet passage, the air inlet passage is communicated with the exhaust passage, the throttle slider is formed with an exhaust hole which has the same extending direction as the air inlet passage, the cross-sectional area of the exhaust hole is smaller than that of the air inlet passage, the throttle slider is slidably arranged in the seat body along the radial direction of the air inlet passage so that the throttle slider moves to a first position and a second position relative to the seat body, when the throttle slider is located at the first position, at least part of the throttle slider moves into the air inlet passage to block at least part of the air inlet passage, and the exhaust hole is located in the air inlet passage so that the gas flowing into the air inlet passage flows to the exhaust passage through the exhaust hole, when the throttle slider is located at the second position, the throttle slider moves out of the air inlet passage. The seat body is further formed with an assembly hole, the assembly hole is located on one side of the air inlet passage along the radial direction of the air inlet passage and is communicated with the air inlet passage, the assembly hole extends along the radial direction of the air inlet passage, the throttle slider is slidably arranged in the assembly hole, and when the throttle slider is located at the second position, the throttle slider is located in the assembly hole.

2. The exhaust silencer device for a core making machine according to claim 1, characterized in that, The inner side wall of the assembly hole is formed with a first guide structure, the throttle slider is provided with a second guide structure, and the first guide structure and the second guide structure are guided and matched to guide the throttle slider in the radial direction of the air inlet passage.

3. The exhaust silencer device for a core making machine according to claim 2, characterized in that, The flow control module further includes a driving structure arranged in the seat body and in transmission connection with the throttle slider, the driving structure is used to drive the throttle slider to move to the first position or the second position.

4. The exhaust silencer device for a core making machine according to claim 1, characterized in that, The driving structure is configured to drive the throttle slider to move to the second position when the throttle slider is located at the first position for a preset delay time after receiving the exhaust signal of the core making machine.

5. The exhaust silencer device for a core making machine according to claim 4, characterized in that, The muffling module includes an exhaust pipe and a sound absorbing layer, the exhaust pipe defines the exhaust passage, the exhaust pipe is formed with a plurality of air holes, and the sound absorbing layer is annular and sleeved on the exhaust pipe.

6. The exhaust silencer device for a core making machine according to any one of claims 1 to 5, characterized in that, The muffling module further includes a shell, the exhaust pipe and the sound absorbing layer are located in the shell, the shell is formed with a communication hole, and the communication hole communicates the exhaust passage and the air inlet passage.

7. The exhaust silencer device for a core making machine according to claim 6, characterized in that The shell is further formed with an exhaust port, the exhaust port is communicated with the outlet of the exhaust passage.

8. The exhaust silencer device for a core making machine according to claim 7, characterized in that, The exhaust muffling device further includes a communication pipe, the communication pipe communicates the communication hole and the air inlet passage.

9. The exhaust silencer device for a core making machine according to claim 7, characterized in that, The exhaust muffling device for the core making machine according to any one of claims 1-9 is included.

10. A coremaking machine characterized by, ​

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