Die-casting machine capable of safely and automatically taking pieces

Abstract

The invention relates to the technical field of metal die-casting equipment, and discloses a die-casting machine capable of safely and automatically taking a part, the die-casting machine comprises a movable die and a static die, one side of the bottom end of the movable die is fixedly connected with a stop block, a drainage channel is formed between the stop block and the static die, one side of the bottom end of the static die is fixedly connected with an injection pipe, and the injection pipe is fixedly connected with the movable die. And an injection piston used for injecting molten metal is slidably connected to the inner side of the injection pipe in a sleeving mode, and a liquid storage pipe used for storing the molten metal is fixedly connected to one side of the bottom end of the static mold. The motor drives the switching block to rotate to switch the corresponding position of the sealing block in a transmission mode, the position of the sealing block is attached to the inner wall of the injection pipe and the inner wall of the check block after mold closing, the injection piston can drive the switching block through negative pressure to enter the injection pipe under the condition that air is not introduced, and the switching block is switched to correspond to the position of a pipe opening of the connecting pipe again; and the injection piston moves to suck quantitative molten metal, so that air is not introduced, the die-casting quality is improved, rapid injection is performed at a rated rate, and the injection efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of metal die-casting equipment, in particular to a die-casting machine capable of safely and automatically taking out parts. Background Art

[0002] A die-casting machine is a casting device that injects molten metal into a mold under pressure, and obtains a casting of a certain shape and size after cooling and solidification. The existing die-casting machine includes a hydraulic mechanism for splitting and closing molds and an injection mechanism. The injection mechanism includes a injection tube and a piston arranged in the injection tube. The piston is driven to move back and forth by a hydraulic rod. When it is necessary to inject molten metal into the mold cavity through the drainage channel reserved after the dynamic mold and the static mold are closed, a spoon is first clamped by a mechanical arm to take a certain amount of molten metal in the insulation cylinder, and the molten metal is poured into the injection tube from the opening at the top of the injection tube. The molten metal is injected by the piston, and during the injection process, the piston moves slowly first and then quickly to reduce the possibility of air being trapped in the mold cavity. After the die-casting is completed, the die-casting part is clamped out by the mechanical arm to complete the removal.

[0003] However, during the use of traditional die-casting machines, the molten metal taken out by the spoon is prone to quality deviations, and the quantitative accuracy of the molten metal quality also affects the range of the cake thickness. During the injection process, if the pouring quality is lower than the rated value, when the piston moves to the speed change position, the molten metal is likely to fill the cavity in a sputtering state, causing air entrapment, which leads to defects such as pores easily formed inside the die-casting. If the pouring quality is higher than the rated value, when the piston reaches the speed change position, part of the molten metal has entered the cavity through the gate at a low speed, which is likely to cause cold shut defects in the die-casting, affecting the molding quality of the die-casting. In addition, the traditional spoon needs to be poured slowly to avoid entraining air, affecting the efficiency of the injection action. Summary of the invention

[0004] In view of the shortcomings of the existing die-casting machines mentioned in the background technology during use, the present invention provides a die-casting machine with safe automatic removal, which has the advantages of avoiding the introduction of air during the liquid filling process and improving the injection efficiency, and solves the technical problems raised in the above background technology.

[0005] The present invention provides the following technical solution: a die-casting machine for safe automatic part removal, comprising a movable die and a static die, a stopper fixedly connected to one side of the bottom end of the movable die, a drainage channel formed between the stopper and the static die, a shot tube fixedly connected to one side of the bottom end of the static die, a shot piston for injecting molten metal slidably sleeved on the inner side of the shot tube, a liquid storage tube for storing molten metal fixedly connected to one side of the bottom end of the static die, the mass of molten metal in the liquid storage tube is not less than the mass required for molding a single die-casting, a connecting tube for connecting the liquid storage tube and the shot tube fixedly connected to the bottom of the liquid storage tube, a guide block slidably sleeved on the inner side of the stopper, a switching block rotatably connected to one side of the guide block, a closing block for sealing the pipe opening of the connecting tube movably provided on the top of the switching block;

[0006] A switching mechanism is provided at the bottom of the movable mold, and the switching mechanism can drive the matching injection piston to drive the switching block to fill the injection tube when the switching block closes the injection tube. The switching mechanism can drive the switching block to rotate and the closing block to extend and retract. When the switching block is filled in the injection tube, the closing block is kept extended, and the switching block is rotated to drive the closing block to retract when the position corresponds to the position of the connecting tube, and the closing block is kept retracted when the closing block rotates to correspond to the position of the drainage channel. The switching mechanism can keep the switching block in place when the injection piston performs the injection action.

[0007] Preferably, a guide groove connected to the guide channel is opened on the top of the guide block, the outer diameters of the switching block and the guide block are adapted to the inner diameter of the injection tube, and the switching block can close the pipe opening of the connecting pipe when the position of the switching block corresponds to that of the connecting pipe.

[0008] Preferably, a sealed cavity is formed between the block and the guide block, and the switching mechanism includes an inlet pipe and an outlet pipe, both of which are fixedly connected to the block and communicated with the sealed cavity, an exhaust pressure valve is fixedly provided on the body of the outlet pipe, and a one-way valve is fixedly provided on the body of the inlet pipe.

[0009] Preferably, the starting pressure of the exhaust pressure valve is greater than the injection pressure of the injection metal liquid, and one side of the top of the stopper is slidably connected to a limit rod.

[0010] Preferably, the switching mechanism also includes a transmission rod, which is fixedly connected to the switching block, one end of the transmission rod is fixedly connected to a spline shaft, one side of the bottom end of the movable mold is fixedly connected to a motor, the output end of the motor is fixedly connected to the transmission shaft, and one end of the transmission shaft is fixedly connected to a spline sleeve for driving the spline shaft to rotate.

[0011] Preferably, an annular cavity is provided on one side of the switching block, and a fixing ring for adjusting the size of the annular cavity is fixedly connected to one side of the stop block, the fixing ring is adapted to the diameter of the annular cavity, a telescopic cavity is formed between the closing block, the guide block and the switching block, and a connecting hole for connecting the telescopic cavity and the annular cavity is provided inside the switching block.

[0012] Preferably, a top rod for limiting the sliding range of the closing block is fixedly connected to the bottom of the closing block, and the outer side of the closing block is arranged as an arc surface and the arc surface is matched with the arc surface of the switching block.

[0013] Preferably, a filter assembly is provided at the opening of the liquid storage tube, and a heater is provided inside the tube wall of the liquid storage tube.

[0014] The present invention has the following beneficial effects:

[0015] 1. The present invention uses negative pressure to drive the switching block to move after the dynamic mold and the static mold are closed by the injection piston cooperating with the closing block and the guide block, so that the switching block is filled into the injection tube without introducing air, and when a rated amount of molten metal needs to be filled, the motor cooperates with the transmission shaft, the transmission rod, the spline shaft and the spline sleeve to drive the switching block to rotate, so that the closing block switches from a state of being in contact with the inner wall of the injection tube to a state corresponding to the position of the connecting tube, so that after the annular groove of the fixed ring moves, the air pressure in the annular groove and the telescopic cavity forms a negative pressure relative to the molten metal in the connecting tube, and the closing block contracts to suck in the molten metal of a mass corresponding to the contraction amount, and then the liquid storage tube is connected with the injection tube cavity through the connecting tube without introducing air, thereby ensuring the stable control of the quality of the molten metal inlet and avoiding the introduction of air to affect the subsequent action of sucking the molten metal.

[0016] 2. The present invention quantitatively fills molten metal by moving the injection piston a rated distance when the injection tube is connected to the liquid storage tube, thereby improving the stability of the quality of molten metal filling and avoiding the quality of die-castings affected by excessive or insufficient filling of molten metal. At the same time, no air is introduced in the process of sucking the molten metal. In the subsequent injection process, there is no need to exhaust the air slowly before high-speed injection. Injection can be performed at a rated speed. In the suction process, liquid can be introduced faster than slow pouring with a traditional spoon without involving air. While improving the quality of die-casting, the efficiency of the injection process is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 It is a schematic cross-sectional view of the overall structure of the present invention;

[0019] Figure 3 It is a schematic cross-sectional view of the structure of the stopper of the present invention;

[0020] Figure 4 For the present invention Figure 3 A magnified view of the structure at A;

[0021] Figure 5 It is a schematic diagram of the cross-section structure of the connecting pipe of the present invention;

[0022] Figure 6 It is a schematic cross-sectional view of the structure of the closing block of the present invention in an extended state.

[0023] In the figure: 1. injection tube; 2. liquid storage tube; 3. injection piston; 4. stopper; 5. switching block; 6. guide block; 7. motor; 8. transmission shaft; 9. spline sleeve; 10. air inlet pipe; 11. air outlet pipe; 12. one-way valve; 13. exhaust pressure valve; 14. connecting pipe; 15. transmission rod; 16. limit rod; 17. closing block; 18. fixing ring; 19. annular cavity; 20. connecting hole; 21. moving mold; 22. static mold; 23. ejector rod; 24. spline shaft. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] See also Figure 1-Figure 2 A die-casting machine for safe and automatic part removal includes a movable die 21 and a static die 22. When the movable die 21 and the static die 22 are closed, a cavity for die-casting molding and a liquid inlet channel for metal hydraulic pressure to enter the cavity are formed between them. A stopper 4 is fixedly connected to one side of the bottom end of the movable die 21. The stopper 4 is embedded in the static die 22 when the movable die 21 and the static die 22 are closed. A drainage channel connected to the liquid inlet channel is formed between the stopper 4 and the static die 22. A shot tube 1 is fixedly connected to one side of the bottom end of the static die 22. A liquid storage tube 2 for temporarily storing molten metal is fixedly connected to one side of the bottom end of the static die 22. A liquid inlet is provided on the top of one side of the liquid storage tube 2. Before a shot action starts, the mechanical arm of the die-casting machine grabs a spoon to take the molten metal out of the insulation tank and fill it into the liquid storage tube 2. The mass of the molten metal filled into the liquid storage tube 2 is not less than the mass required for molding a single die-casting.

[0026] A filter assembly is provided at the opening of the liquid storage tube 2, and the filter assembly is preferably a filter screen. Since the liquid is introduced into the liquid storage tube 2 before the next injection action starts, the filtering process will not affect the efficiency of the metal hydraulic injection, thereby avoiding the influence of aluminum slag on the subsequent injection. A heater is provided in the tube wall of the liquid storage tube 2, and the heater is used to ensure the temperature of the molten metal in the liquid storage tube 2 and the molding quality of the die-casting. A shooting piston 3 for injecting molten metal is slidably sleeved on the inner side of the injection tube 1, and one end of the injection piston 3 is fixedly connected to the hydraulic rod, and the hydraulic rod can drive the injection piston 3 to move back and forth.

[0027] See also Figure 1-Figure 4 A connecting pipe 14 is fixedly connected to the bottom of the liquid storage tube 2, one end of the connecting pipe 14 is fixedly connected to the injection tube 1, and the connecting pipe 14 connects the cavity of the liquid storage tube 2 with the cavity of the injection tube 1. A guide block 6 is slidably sleeved on the inner side of the stopper 4, and a guide groove connected to the guide channel is provided on the top of the guide block 6. A switching block 5 is rotatably connected to one side of the guide block 6. The outer diameters of the switching block 5 and the guide block 6 are matched with the inner diameter of the injection tube 1. The guide block 6 can slide in the radial direction relative to the stopper 4, and a sealed cavity is formed between the stopper 4 and the guide block 6. A closing block 17 for sealing the pipe mouth of the connecting pipe 14 is movably provided on the top of the switching block 5. The closing block 17 is in an inverted L shape and the outer side is set as an arc surface.

[0028] See also Figure 2-Figure 6 An air inlet pipe 10 is fixedly provided on one side of the bottom of the block 4, an air outlet pipe 11 is fixedly provided on one side of the bottom of the block 4, a one-way valve 12 is fixedly provided on the body of the air inlet pipe 10, the one-way valve 12 is used for the air outside the block 4 to enter the sealed cavity through the one-way valve 12 in one direction, an exhaust pressure valve 13 is fixedly provided on the body of the air outlet pipe 11, the exhaust pressure valve 13 is preferably a pressure relief valve, the exhaust pressure valve 13 can also be set as a back pressure valve, the starting pressure of the exhaust pressure valve 13 is greater than the injection pressure of the injection metal liquid, the switch A transmission rod 15 is fixedly connected at the midpoint of one side of the block 5, one end of the transmission rod 15 is fixedly connected to a spline shaft 24, one side of the bottom end of the movable mold 21 is fixedly connected to a motor 7, the output end of the motor 7 is fixedly connected to a transmission shaft 8, one end of the transmission shaft 8 is fixedly connected to a spline sleeve 9 for driving the spline shaft 24 to rotate, the spline sleeve 9 is slidably sleeved with the spline shaft 24 and the rotation of the spline sleeve 9 can drive the spline shaft 24 to rotate, and in the process of the guide block 6 moving to drive the transmission rod 15 to move, the spline sleeve 9 remains sleeved with the spline shaft 24.

[0029] One side of the top of the stopper 4 is slidably connected to a limit rod 16, which is T-shaped. The limit rod 16 can move relative to the stopper 4 without separating from the stopper 4. One end of the limit rod 16 is fixedly connected to the guide block 6. The limit rod 16 limits the rotation of the guide block 6 relative to the stopper 4 and limits the sliding range of the guide block 6 relative to the stopper 4. An annular cavity 19 is provided on one side of the switching block 5. A fixing ring 18 for adjusting the cavity size of the annular cavity 19 is fixedly connected to one side of the stopper 4. The fixing ring 18 is adapted to the diameter of the annular cavity 19 and one side of the fixing ring 18 is embedded in the annular cavity 19, so that the annular cavity 19 keeps the annular cavity 19 closed during the movement of the switching block 5 driven by the guide block 6. A connecting hole 20 for connecting the telescopic cavity and the annular cavity 19 is provided inside the switching block 5. A top rod 23 for limiting the sliding range of the closing block 17 is fixedly connected to the bottom of the closing block 17. The top rod 23 is in an inverted T-shape and can slide relative to the switching block 5 without separating from the switching block 5.

[0030] The guide block 6 and the switching block 5 remain contracted on the inner side of the stopper 4, that is, the guide block 6 and the stopper 4 remain in close contact, and the gas in the telescopic cavity pushes the closing block 17 to remain in the extended state, that is, the arc surface of the closing block 17 cooperates with the arc surface of the switching block 5 to form a complete ring, and the liquid storage tube 2 is filled with a sufficient amount of molten metal for die casting. The hydraulic rod drives the injection piston 3 to move to the side close to the switching block 5, and the motor 7 drives the transmission shaft 8 to rotate, and the transmission shaft 8 drives the spline sleeve 9 to rotate, and the spline sleeve 9 drives the spline shaft 24 to rotate, thereby driving the transmission rod 15 to rotate, and the transmission drives the switching block 5 to rotate, and the angle of the closing block 17 is adjusted so that the closing block 17 is staggered with the guide groove at the top of the guide block 6, that is, the closing block 17 is staggered with the guide groove at the top of the stopper 4 and is in close contact with the inner wall of the stopper 4, and the movable mold 21 and the static mold 22 are molded together, and the movable mold 21 drives the stopper 4 to move, and the stopper 4 drives the guide block 6 to move.

[0031] The guide block 6 drives the switching block 5 to move until the movable mold 21 fits with the static mold 22. At this time, the switching block 5 fits with the nozzle of the injection tube 1 and closes the nozzle of the injection tube 1, and the switching block 5 fits with the injection piston 3. The hydraulic rod drives the injection piston 3 to move. Negative pressure is formed between the injection piston 3 and the switching block 5 to drive the switching block 5 to extend out of the block 4. The switching block 5 drives the guide block 6 to extend out of the block 4. The air enters the sealing cavity through the air inlet pipe 10 in one direction, and the length of the fixing ring 18 embedded in the annular cavity 19 gradually decreases, so that the volume of the annular cavity 19 increases and the air pressure decreases. The closing block 17 cooperates with the inner wall of the block 4, the inner wall of the injection tube 1, the guide block 6 and the switching block 5 to keep the position of the closing block 17 fixed until the switching block 5 extends out of the block 4, and the outer wall of the switching block 5 replaces the injection piston 3 to close the opening of the connecting tube 14.

[0032] The motor 7 rotates and drives the switching block 5 to rotate, so that the position of the closing block 17 corresponds to the position of the pipe mouth of the connecting tube 14, and the telescopic cavity forms a relative negative pressure relative to the connecting tube 14. The closing block 17 moves toward the center of the switching block 5 and sucks in and out a volume of molten metal, ensuring that no air is introduced into the switching block 5 during the process of entering the injection tube 1, and can switch between the connecting drainage groove and the connecting tube 14, and move the injection piston 3 again, so that the injection piston 3 moves to form a negative pressure and continuously sucks a rated amount of molten metal from the liquid storage tube 2 through the channel vacated by the closing block 17, ensuring that the amount of molten metal inlet is fixed, and when adjusting the amount of molten metal inlet, only the suction amount of the injection piston 3 needs to be adjusted, and the molten metal entering the injection tube 1 does not contain air, thereby avoiding the influence of air on the subsequent injection quality.

[0033] After the liquid is fed, the motor 7 drives the switching block 5 to rotate, so that the position of the closing block 17 corresponds to the position of the guide groove, and the injection piston 3 is injected at a rated rate. The molten metal enters the cavity through the guide groove and the drainage channel. Since no air is introduced, there is no need to inject slowly and then quickly. The injection can always be kept fast, which improves the efficiency of the injection action until the injection piston 3 presses out the sucked molten metal. At this time, the injection piston 3 is against the switching block 5, and the injection piston 3 continues to move, so that the guide block 6 has a tendency to compress the sealed cavity. When the air pressure in the sealed cavity is higher than the rated value of the pressure relief valve, the injection piston 3 drives the switching block 5 to move, so that the switching block 5 and the guide block 6 are retracted into the stop block 4, which is convenient for mold separation and the injection piston 3 replaces the pipe mouth of the connecting pipe 14. After the injection action is completed, the liquid storage tube 2 can be filled with molten metal again. After mold separation, the mechanical arm of the die-casting machine takes out the die-casting to complete a single die-casting.

[0034] The method of use (working principle) of the present invention is as follows:

[0035] After the movable mold 21 and the static mold 22 are closed, when it is necessary to fill the injection tube 1 with molten metal, the injection piston 3 moves to form negative pressure to drive the switching block 5 to move, and the closing block 17 remains extended, so that the switching block 5 is embedded in the injection tube 1 without introducing air. The motor 7 drives the switching block 5 to rotate, so that the closing block 17 rotates to a position corresponding to the connecting tube 14 and then contracts and opens. The injection piston 3 moves again to inhale a rated amount of molten metal through negative pressure without introducing air. The motor 7 drives the switching block 5 to rotate again to switch the position of the closing block 17 to a position corresponding to the guide groove, so that the injection piston 3 can maintain a rapid injection action. After the injection action is completed, the injection piston 3 continues to move to push the switching block 5 to reset.

Claims

1. A die-casting machine for safe automatic part removal, comprising a movable die (21) and a static die (22), wherein a stopper (4) is fixedly connected to one side of the bottom end of the movable die (21), a drainage channel is formed between the stopper (4) and the static die (22), a shot tube (1) is fixedly connected to one side of the bottom end of the static die (22), a shot piston (3) for injecting molten metal is slidably sleeved inside the shot tube (1), and the characteristics are: A liquid storage pipe (2) for storing molten metal is fixedly connected to one side of the bottom end of the static mold (22); a connecting pipe (14) for connecting the liquid storage pipe (2) and the injection pipe (1) is fixedly connected to the bottom of the liquid storage pipe (2); a guide block (6) is slidably sleeved on the inner side of the stopper (4); a switching block (5) is rotatably connected to one side of the guide block (6); a closing block (17) for sealing the pipe opening of the connecting pipe (14) is movably provided on the top of the switching block (5); A switching mechanism is provided at the bottom of the movable mold (21). The switching mechanism can drive the switching block (5) to be filled into the injection tube (1) when the switching block (5) closes the injection tube (1) with the matching injection piston (3). The switching mechanism can drive the switching block (5) to rotate and the closing block (17) to retract. When the switching block (5) is filled into the injection tube (1), the closing block (17) is kept extended. When the switching block (5) is rotated and the closing block (17) is driven to retract when the position corresponds to the position of the connecting tube (14), the closing block (17) is kept retracted when the closing block (17) is rotated to correspond to the position of the drainage channel. The switching mechanism can keep the switching block (5) in a fixed position when the injection piston (3) performs an injection action.

2. A safe and automatic part removal die-casting machine according to claim 1, characterized in that: The top of the guide block (6) is provided with a guide groove connected to the guide channel; the outer diameters of the switching block (5) and the guide block (6) are adapted to the inner diameter of the injection tube (1); and the switching block (5) can close the pipe opening of the connecting pipe (14) when the positions of the switching block (5) and the connecting pipe (14) correspond.

3. A safe and automatic part removal die-casting machine according to claim 1, characterized in that: A sealed cavity is formed between the block (4) and the guide block (6); the switching mechanism comprises an air inlet pipe (10) and an air outlet pipe (11); the air inlet pipe (10) and the air outlet pipe (11) are both fixedly connected to the block (4) and are both in communication with the sealed cavity; an exhaust pressure valve (13) is fixedly provided on the body of the air outlet pipe (11); and a one-way valve (12) is fixedly provided on the body of the air inlet pipe (10).

4. A die-casting machine for safe automatic removal according to claim 3, characterized in that: The starting pressure of the exhaust pressure valve (13) is greater than the injection pressure of the injected metal liquid, and one side of the top of the stopper (4) is slidably connected to a limit rod (16).

5. The die-casting machine for safe automatic removal of parts according to claim 3, characterized in that: The switching mechanism further comprises a transmission rod (15), the transmission rod (15) being fixedly connected to the switching block (5), one end of the transmission rod (15) being fixedly connected to a spline shaft (24), one side of the bottom end of the movable mold (21) being fixedly connected to a motor (7), the output end of the motor (7) being fixedly connected to a transmission shaft (8), and one end of the transmission shaft (8) being fixedly connected to a spline sleeve (9) for driving the spline shaft (24) to rotate.

6. The die-casting machine for safe automatic removal of parts according to claim 1, characterized in that: An annular cavity (19) is provided on one side of the switching block (5); a fixing ring (18) for adjusting the size of the annular cavity (19) is fixedly connected to one side of the stopper (4); the fixing ring (18) is adapted to the diameter of the annular cavity (19); a telescopic cavity is formed between the closing block (17), the guide block (6) and the switching block (5); and a connecting hole (20) for connecting the telescopic cavity and the annular cavity (19) is provided inside the switching block (5).

7. A die-casting machine for safe automatic removal according to claim 6, characterized in that: The bottom of the closing block (17) is fixedly connected with a push rod (23) for limiting the sliding range of the closing block (17), and the outer side of the closing block (17) is arranged as a curved surface and the curved surface is adapted to the curved surface of the switching block (5).

8. The die-casting machine for safe automatic part removal according to claim 1, characterized in that: A filter assembly is provided at the opening of the liquid storage tube (2), and a heater is provided inside the tube wall of the liquid storage tube (2).

Images