Novel knockout head of casting mold

[0016] Example one:

[0017] Such as figure 1 As shown, the sand falling head of the new casting mold of this embodiment includes a fixed seat 1. A lifting cylinder 2 is installed on the upper surface of the fixed seat 1, and a plurality of top cores 3 are installed on the bottom surface. The position of the top core 3 and the injection The positions of the sand holes correspond to each other. The fixing seat 1 is a hollow structure with an inner cavity 100. The upper surface of the fixing seat 1 is provided with an air inlet pipe 4 communicating with the inner cavity 100. The air inlet pipe 4 is equipped with an electromagnetic regulating valve 11 and an electromagnetic regulating valve 11 The controller 12 is connected to the timing controller 13. The timing controller 13 is equipped with a timing activation module. The timing activation module sends a signal to the controller 12 according to the set time. The controller 12 controls the opening of the electromagnetic regulating valve 11 according to the received signal. The top core 3 is rotatably connected to the fixed seat 1 through the mounting head 5, the top core 3 is a hollow tube structure with a gas guide channel 30, and its side wall has a plurality of jet holes connected to the gas guide channel 30 and arranged up and down 31. The jet hole 31 is arranged obliquely downward with respect to the central axis of the top core 3; the mounting head 5 is rotatably connected with the fixed seat 1 through the bearing 6 and has a venting cavity 50 connecting the inner cavity 100 and the air guiding channel 30, and the venting cavity 50 The inner diameter of the air guide channel 30 is larger than the inner diameter of the air guide channel 30, and the ventilation cavity 50 transitions to the air guide channel 30 to form a constricted structure as a whole to increase the air pressure of the air guide channel 30, thereby increasing the injection pressure of the jet hole 31; A driven gear 7 is installed. Adjacent mounting heads 5 are meshed and synchronously connected by a driven gear 7. The driven gear 7 at the outermost end on one side meshes with a driving gear 8, and the driving gear 8 is connected to a driving motor 9 through a belt 10.

[0018] When working, the lifting cylinder 2 pushes the top core 3 into the sand hole, the air inlet pipe 4 is connected with the air pump, and introduces a high-pressure airflow into the fixed seat 1. The airflow passes through the air guide channel 30 and is ejected from the jet hole 31. Into the shot hole, the sand is washed off. The driving motor 9 drives the driven gear 7 to rotate through the driving gear 8 so as to drive the top core 3 to rotate, realize the rotation blowing and blow off the sand completely. The timing controller 13 is provided with a timing control module with multiple gears, such as three gears generally set: the gear interval time is 3 seconds, that is, a signal is sent to the controller 12 every 3 seconds, After receiving the signal, the controller 12 adjusts the opening degree of the electromagnetic regulating valve 11 once; after three adjustments, the opening degree of the electromagnetic regulating valve 11 is the largest; thereby achieving gradual adjustment of the air pressure in the inner cavity 100, and finally achieving opposite injection The sand in the sand hole is gradually blown off. Compared with the removal of constant injection pressure, the effect is better, avoiding a large amount of sand lifting when blowing directly at the maximum injection pressure, and ultimately improving the blowing efficiency and effect.

[0019] Embodiment two:

[0020] Such as figure 1 , figure 2 As shown, the sand shake head of the new casting mold of this embodiment has an improvement over the first embodiment in that the inner end of the jet hole 31 is provided with a flared flaring 32. The trumpet shape of the flaring 32 facilitates the air flow into the jet hole 31 and reduces the ejection resistance.

[0021] Embodiment three:

[0022] Such as figure 1 As shown, the improvement of the shakeout head of the new casting mold of this embodiment compared with the first embodiment is that the air inlet pipe 4 is a bellows structure that can be bent and expanded. The air inlet pipe 4 is connected with the air pipe, which can be bent and expanded appropriately to facilitate the installation of the air pipe.