Automatic feeding system for injection molding machine

Abstract

The present invention discloses an automatic feeding system for an injection molding machine, comprising a storage hopper and a discharge hopper arranged below the storage hopper, the discharge hopper is funnel-shaped, and a connecting pipe extends downward from the bottom of the discharge hopper, the top cover of the storage hopper is provided with a top cover, the outer wall of the storage hopper is connected to a feed pipe near the top, and a material distribution device is also provided inside the storage hopper; the material distribution device comprises a rotating shaft and a sleeve fixedly sleeved on the rotating shaft, the two ends of the rotating shaft are rotatably connected to the inner walls of the front and rear sides of the storage hopper, the outer wall of the sleeve is provided with a plurality of material distribution hoppers, the outer wall of the discharge hopper is movably connected with a rotating rod, and the end of the rotating rod is provided with a striking hammer for striking the outer wall of the discharge hopper. The beneficial effects are as follows: by arranging the material distribution device in the storage hopper, the plastic can be allowed to enter the storage hopper in stages, avoiding the connection pipe from being blocked due to the inability to discharge in time; the rotating rod is driven to rotate by the extension of the electric push rod, so that the striking hammer strikes the outer wall of the discharge hopper to alleviate the blockage.

Description

Technical Field

[0001] The invention relates to the technical field of feeding equipment, in particular to an automatic feeding system for an injection molding machine. Background Art

[0002] Injection molding machine, also known as injection molding machine or injection machine, is the main molding equipment that uses plastic molding molds to make plastic products of various shapes from thermoplastics or thermosetting plastics. It is divided into vertical, horizontal, and all-electric types. The injection molding machine can heat the plastic and apply high pressure to the molten plastic to make it eject and fill the mold cavity. A feeding device is set above the injection part of the injection molding machine to feed the granular plastic into the injection part.

[0003] The existing feeding device injects plastic at one time. The plastic is transported to the injection part through the connecting pipe under the action of its own weight. However, if too much plastic is injected at one time, the connecting pipe will be blocked, resulting in uneven feeding. When too much plastic is injected into the injection part, the heating system cannot fully heat it. When the injection part is not injected with enough plastic, the mold cavity cannot be filled. For this reason, we propose an automatic feeding system for injection molding machines to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide an automatic feeding system for an injection molding machine to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an automatic feeding system for an injection molding machine, comprising a storage hopper and a discharge hopper arranged below the storage hopper, the discharge hopper is funnel-shaped, and a connecting pipe extends downward from the bottom of the discharge hopper, the top cover of the storage hopper is provided with a top cover, the outer wall of the storage hopper is connected to a feed pipe at the top, and a material dividing device is also provided inside the storage hopper; the material dividing device comprises a rotating shaft and a sleeve fixedly sleeved on the rotating shaft, the two ends of the rotating shaft are rotatably connected to the front and rear inner walls of the storage hopper, the outer wall of the sleeve is provided with a plurality of material dividing hoppers, the outer wall of the discharge hopper is movably connected with a rotating rod, and the end of the rotating rod is provided with a striking hammer for striking the outer wall of the discharge hopper.

[0006] Preferably, the feed pipe consists of a horizontal section and an inclined section, and the inclined section of the feed pipe passes through the inner wall of the storage hopper and leads to the interior.

[0007] Preferably, a fixing plate is provided on the outer wall of the discharge hopper below the rotating rod, and an electric push rod is fixedly installed on the top of the fixing plate, and the top end of the electric push rod is movably connected to the middle part of the rotating rod.

[0008] Preferably, the storage hopper is a rectangular frame structure with openings at the upper and lower ends, and the storage hopper and the discharge hopper are fixedly connected by a flange.

[0009] Preferably, the length of the rotating shaft is greater than the length of the sleeve, and the length of the distribution hopper is equal to the length of the sleeve.

[0010] Preferably, the end of the feed pipe is connected to an external pumping device.

[0011] Preferably, it also includes a dumping mechanism, which includes a first support plate and a second support plate, the first support plate is fixed with a first vertical plate, the second support plate is respectively fixed with a second vertical plate, a third vertical plate and a fourth vertical plate, the first support plate and the second support plate are respectively fixed to the outer wall of the storage hopper;

[0012] The first vertical plate is assembled and fixed to the outer shell of the hollow shaft cylinder through the cylinder flange, and the cylinder flange is fixed to the outer shell of the hollow shaft cylinder; a hollow shaft is installed inside the hollow shaft cylinder, and the vent of the hollow shaft cylinder can drive the hollow shaft to move axially;

[0013] A connecting cylinder is sleeved inside the hollow shaft, and a connecting flange is fixed on one end of the connecting cylinder close to the storage hopper. The connecting flange is assembled and fixed with the torque flange by bolts. The torque flange is fixed on the upper shell of the stator of the torque sensor. A friction disk is also fixed on the stator of the torque sensor. The friction disk is pressed against the outer wall of the storage hopper and is relatively fixed by friction.

[0014] Preferably, the rotor of the torque sensor is mounted on the rotating shaft in an axially slidable and non-circumferentially rotatable manner, and the rotating shaft can drive the rotor to rotate synchronously when rotating; the connecting cylinder is mounted in the hollow shaft in an axially rotatable manner without axial sliding, and the rotating shaft and the connecting cylinder can be assembled in a circumferentially rotatable and axially movable manner;

[0015] The hollow shaft is also assembled and fixed with the clutch plate, and the clutch plate is assembled with one end of the clutch cylinder so that it can rotate in a circle but cannot move axially. The other end of the clutch cylinder is assembled with the second vertical plate and the third vertical plate so that it can rotate in a circle and move axially. The clutch cylinder is also respectively fixed with a first gear and a first clutch disk. The first gear is meshed with the second gear for transmission, and the second gear is fixed on one end of the rotating shaft passing through the connecting cylinder.

[0016] Preferably, a coding disk is also fixed on the rotating shaft, and a plurality of coding holes are arranged on the coding disk along its circumference evenly distributed. The edge of the coding disk provided with the coding holes is installed in the encoder. When in use, the rotation angle of the rotating shaft is determined by the encoder.

[0017] Preferably, the first clutch disc can be tightly attached to and engaged with the end surface of the second clutch disc; the second clutch disc is fixed on the motor shaft, one end of the motor shaft is inserted into the clutch inner cylinder of the clutch cylinder, and the other end is inserted into the motor after passing through the fourth vertical plate, and the motor shaft and the clutch inner cylinder can be assembled in a circular rotation and axial movement; the motor can drive the motor shaft to rotate in a circular rotation after being energized; the motor shaft and the fourth vertical plate can be assembled in a circular rotation but not in an axial movement.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: by arranging a material dividing device in the storage hopper, the plastic can be allowed to enter the storage hopper in stages, thereby avoiding blockage of the connecting pipe due to the inability to unload materials in time; the rotating rod is driven to rotate by the extension of the electric push rod, so that the striking hammer strikes the outer wall of the discharge hopper to alleviate the blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural diagram of Embodiment 1;

[0020] Figure 2 It is a three-dimensional diagram of the material distribution device in Example 1;

[0021] Figure 3 for Figure 1 The enlarged schematic diagram at A in the middle;

[0022] Figure 4 Structural schematic diagram of embodiment 2. DETAILED DESCRIPTION

[0023] 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. Embodiment 1

[0024] See also Figure 1-3The present invention provides a technical solution: an automatic feeding system for an injection molding machine, comprising a storage hopper 1 and a discharge hopper 2 arranged below the storage hopper 1, the storage hopper 1 is a rectangular frame structure with openings at both ends, the storage hopper 1 and the discharge hopper 2 are fixedly connected by a flange, the discharge hopper 2 is a funnel-shaped structure made of a stainless steel sheet, and a connecting pipe extends downward from the bottom of the discharge hopper 2, the top cover of the storage hopper 1 is provided with a top cover 3, the outer wall of the storage hopper 1 is connected to a feed pipe 4 near the top, the feed pipe 4 is composed of a horizontal section and an inclined section, the inclined section of the feed pipe 4 passes through the inner wall of the storage hopper 1 to the inside, the end of the feed pipe 4 is connected to an external pumping device, the plastic is pumped into the storage hopper 1 through the feed pipe 4 by the pumping device, and the storage hopper 1 is also provided with a material distributor. Device 5; the material distribution device 5 includes a rotating shaft 51 and a sleeve 52 fixedly sleeved on the rotating shaft 51, the length of the rotating shaft 51 is greater than the length of the sleeve 52, the two ends of the rotating shaft 51 are rotatably connected to the inner walls of the front and rear sides of the storage hopper 1, and the outer wall of the sleeve 52 is provided with a plurality of distribution hoppers 53, the length of the distribution hoppers 53 is equal to the length of the sleeve 52, and the distribution hoppers 53 are distributed in an annular shape outside the sleeve 52; the plastic transported through the feed pipe 4 falls into one of the distribution hoppers 53, and the plastic in the distribution hopper 53 gradually increases, and the rotating shaft 51 is rotated by external force, and the distribution hopper 53 rotates counterclockwise therewith, and the plastic is poured into the discharge hopper 2, and the next group of hoppers 53 rotates to the bottom of the feed pipe 4 to receive the plastic, and so on and so forth, so as to realize the plastic segmented feeding;

[0025] The outer wall of the discharge hopper 2 is movably connected with a rotating rod 6, and a striking hammer 7 is provided at the end of the rotating rod 6. A fixed plate 8 is provided on the outer wall of the discharge hopper 2 below the rotating rod 6, and an electric push rod 99 is fixedly installed on the top of the fixed plate 8. The top of the electric push rod 99 is movably connected to the middle part of the rotating rod 6. The electric push rod 99 is electrically connected to an external power supply. The rotating rod 6 is driven to reciprocate by the extension and retraction of the electric push rod 99, so that the striking hammer 7 hits the outer wall of the discharge hopper 2, and the plastic in the discharge hopper 2 is vibrated to avoid blockage in the connecting pipe.

[0026] Working principle: When the present invention is in use, plastic is transported to one of the distribution hoppers 53 of the distribution device 5 through the feed pipe 4. When the plastic in the distribution hopper 53 increases to a certain weight, the rotating shaft 51 is subjected to uneven force. At this time, the rotating shaft 51 drives the distribution hopper 53 to rotate, and the plastic in the distribution hopper 53 falls into the discharge hopper 2. The next group of distribution hoppers 53 rotates to the bottom of the feed pipe 4 to receive the plastic. The plastic that falls into the discharge hopper 2 is transported to the injection molding part through the connecting pipe below. The rotating rod 6 is driven to reciprocate by the telescopic shaft of the electric push rod 99, so that the striking hammer 7 strikes the outer wall of the discharge hopper 2, and the plastic in the discharge hopper 2 is vibrated to avoid blockage in the connecting pipe. Embodiment 2

[0027] See also Figure 4Since the distribution hopper 53 is often unable to be accurately positioned, that is, accurately enter the bottom of the feed pipe 4, simply relying on the gravity of the distribution hopper 53 to drive the shaft 51 to rotate, the applicant has designed a dumping mechanism.

[0028] The dumping mechanism includes a first support plate 9 and a second support plate 11. The first support plate 9 is fixed with a first vertical plate 10. The second support plate 11 is respectively fixed with a second vertical plate 12, a third vertical plate 13, and a fourth vertical plate 14. The first support plate 9 and the second support plate 11 are respectively fixed to the outer wall of the storage hopper 1.

[0029] The first vertical plate 10 is assembled and fixed with the outer shell of the hollow shaft cylinder 20 through the cylinder flange 19, and the cylinder flange 19 is fixed on the outer shell of the hollow shaft cylinder 20; a hollow shaft 21 is installed inside the hollow shaft cylinder 20, and the vent of the hollow shaft cylinder 20 can drive the hollow shaft 21 to move axially;

[0030] A connecting cylinder 22 is sleeved inside the hollow shaft 21, and a connecting flange 18 is fixed on one end of the connecting cylinder 22 close to the storage hopper 1. The connecting flange 18 is assembled and fixed with the torque flange 17 by bolts. The torque flange 17 is fixed on the stator (on the housing) of the torque sensor 15. A friction disk 16 is also fixed on the stator of the torque sensor 15. The friction disk 16 is pressed against the outer wall of the storage hopper 1 and is relatively fixed by friction.

[0031] The rotor 34 of the torque sensor 15 is mounted on the rotating shaft 51 in an axially slidable and non-circumferentially rotatable manner, and the rotating shaft 51 can drive the rotor 34 to rotate synchronously when rotating; the connecting cylinder 22 is mounted in the hollow shaft 21 in an axially non-slidable and circumferentially rotatable manner, and the rotating shaft 51 and the connecting cylinder 22 can be assembled in a circumferentially rotatable and axially movable manner;

[0032] The hollow shaft 21 is also assembled and fixed with the clutch plate 23. The clutch plate 23 is assembled with one end of the clutch cylinder 24 so that it can rotate in a circular manner but cannot move axially. The other end of the clutch cylinder 24 is assembled with the second vertical plate 12 and the third vertical plate 13 so that it can rotate in a circular manner and move axially. The first gear 28 and the first clutch disk 25 are also fixed on the clutch cylinder 24 respectively. The first gear 28 is meshed with the second gear 29 for transmission. The second gear 29 is fixed on one end of the rotating shaft 51 that passes through the connecting cylinder 22. The rotating shaft 51 is also fixed with an encoding disk 30. The encoding disk 30 is provided with a plurality of encoding holes 31 evenly distributed along its circumference. The edge of the encoding disk 30 provided with the encoding holes 31 is installed in the encoder 32. When in use, the rotation angle of the rotating shaft 51 is judged by the encoder.

[0033] The first clutch disc 25 can be closely attached to and engaged with the end surface of the second clutch disc 26, so that the first clutch disc 25 can rotate integrally with the second clutch disc 26 through the friction force; the second clutch disc 26 is fixed on the motor shaft 33, one end of the motor shaft 33 is installed in the clutch inner cylinder 35 of the clutch cylinder 24, and the other end is installed in the motor 27 after passing through the fourth vertical plate 14, and the motor shaft 33 and the clutch inner cylinder 35 can be assembled in a circular rotation and axial movement; the motor 27 can drive the motor shaft 33 to rotate in a circular rotation after being powered on. The motor shaft 33 and the fourth vertical plate can be assembled in a circular rotation but not in an axial movement.

[0034] Figure 4 The state shown is the initial state, at this time, the friction disc 16 is pressed against the storage hopper 1, so that the rotor of the torque sensor can rotate relative to the stator, that is, it can detect the torque on the shaft 51, which is applied by the gravity of the material in the distribution hopper. Therefore, by inputting the detected torque into the PLC, it can be determined whether the distribution hopper 53 is full (the torque value at this time is the preset threshold). In the initial state, the first clutch disc does not contact the second clutch disc.

[0035] When the torque sensor detects that the torque reaches the preset threshold in the PLC, the hollow shaft cylinder 20 drives the hollow shaft 21 to move toward the encoding disc, so that the friction disc is separated from the storage hopper 1. At this time, the torque sensor can rotate with the circumference of the rotating shaft. When the hollow shaft moves, it will drive the clutch cylinder to move synchronously, so that the first clutch disc and the second clutch disc gradually stick together until the hollow shaft moves to the rightmost end. At this time, the first clutch disc and the second clutch disc are tightly attached to each other. The motor 27 is started, and the motor drives the clutch cylinder to rotate through the first clutch disc and the second clutch disc. The clutch cylinder drives the rotating shaft to rotate 120° (360° divided by the total number of sub-hoppers evenly distributed in the circumferential direction of the sub-hopper) through the first gear and the second gear. At this time, the corresponding sub-hopper rotates 120°, and the internal material is dumped at one time, and the next sub-hopper enters the bottom of the feed pipe. Of course, the rotation angle of the rotating shaft can be detected by the encoder, and then input into the PLC, and the PLC controls the rotation of the motor to realize the positioning of each sub-hopper.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic feeding system for an injection molding machine, comprising a storage hopper (1) and a discharge hopper (2) arranged below the storage hopper (1), characterized in that: The discharge hopper (2) is funnel-shaped, and a connecting pipe extends downward from the bottom of the discharge hopper (2). The top cover of the storage hopper (1) is provided with a top cover (3). The outer wall of the storage hopper (1) is connected to a feed pipe (4) at the top. A material distribution device (5) is also provided inside the storage hopper (1). The material distribution device (5) comprises a rotating shaft (51) and a sleeve (52) fixedly sleeved on the rotating shaft (51). The two ends of the rotating shaft (51) are rotatably connected to the inner walls of the storage hopper (1) at the front and rear sides. The outer wall of the sleeve (52) is provided with a plurality of material distribution hoppers (53). The outer wall of the discharge hopper (2) is movably connected to a rotating rod (6), and a striking hammer (7) for striking the outer wall of the discharge hopper (2) is provided at the end of the rotating rod (6). The material storage hopper (1) further comprises a dumping mechanism, the dumping mechanism comprising a first support plate (9) and a second support plate (11), the first support plate (9) being fixed with a first vertical plate (10), the second support plate (11) being respectively fixed with a second vertical plate (12), a third vertical plate (13) and a fourth vertical plate (14), the first support plate (9) and the second support plate (11) being respectively fixed to the outer wall of the storage hopper (1); the first vertical plate (10) being assembled and fixed to the outer shell of the hollow shaft cylinder (20) via a cylinder flange (19), the cylinder flange (19) being fixed to the outer shell of the hollow shaft cylinder (20); the hollow shaft cylinder (20) A hollow shaft (21) is installed inside, and the vent of the hollow shaft cylinder (20) can drive the hollow shaft (21) to move axially; a connecting tube (22) is installed inside the hollow shaft (21), and a connecting flange (18) is fixed on one end of the connecting tube (22) close to the storage hopper (1), and the connecting flange (18) is assembled and fixed with a torque flange (17) by bolts, and the torque flange (17) is fixed on the stator of the torque sensor (15), and a friction disk (16) is also fixed on the stator of the torque sensor (15), and the friction disk (16) is pressed against the outer wall of the storage hopper (1) and is relatively fixed by friction force; The rotor (34) of the torque sensor (15) is mounted on the rotating shaft (51) in an axially slidable and non-circumferentially rotatable manner, and the rotating shaft (51) can drive the rotor (34) to rotate synchronously when rotating; the connecting cylinder (22) is mounted in the hollow shaft (21) in an axially non-slidable and circumferentially rotatable manner, and the rotating shaft (51) and the connecting cylinder (22) are assembled in a circumferentially rotatable and axially movable manner; the hollow shaft (21) is also assembled and fixed with a clutch plate (23), and the clutch plate (23) is assembled with the clutch plate (23). One end of the clutch cylinder (24) is assembled so as to be rotatable in a circumferential manner but not axially movable, and the other end of the clutch cylinder (24) is assembled so as to be rotatable in a circumferential manner and axially movable with the second vertical plate (12) and the third vertical plate (13), respectively. A first gear (28) and a first clutch plate (25) are fixed to the clutch cylinder (24), respectively. The first gear (28) is meshed with a second gear (29) for transmission, and the second gear (29) is fixed to one end of the rotating shaft (51) passing through the connecting cylinder (22); A coding disc (30) is also fixed on the rotating shaft (51), and a plurality of coding holes (31) are arranged on the coding disc (30) and are evenly distributed along its circumference. The edge of the coding disc (30) provided with the coding holes (31) is inserted into the encoder (32), and when in use, the rotation angle of the rotating shaft (51) is determined by the encoder; The first clutch disc (25) can be closely attached to and engaged with the end surface of the second clutch disc (26); the second clutch disc (26) is fixed on the motor shaft (33); one end of the motor shaft (33) is inserted into the clutch inner cylinder (35) of the clutch cylinder (24); the other end of the motor shaft (33) passes through the fourth vertical plate (14) and is then inserted into the motor (27); the motor shaft (33) and the clutch inner cylinder (35) can be assembled to rotate in a circular manner and to move in an axial direction; the motor (27) can be driven to rotate in a circular manner when power is supplied; and the motor shaft (33) and the fourth vertical plate can be assembled to rotate in a circular manner but not to move in an axial direction.

2. The automatic feeding system for an injection molding machine according to claim 1, characterized in that: The feed pipe (4) consists of a horizontal section and an inclined section, and the inclined section of the feed pipe (4) passes through the inner wall of the storage hopper (1) and leads to the interior.

3. The automatic feeding system for an injection molding machine according to claim 1, characterized in that: A fixing plate (8) is provided on the outer wall of the discharge hopper (2) below the rotating rod (6), and an electric push rod (99) is fixedly mounted on the top of the fixing plate (8), wherein the top end of the electric push rod (99) is movably connected to the middle of the rotating rod (6).

4. The automatic feeding system for an injection molding machine according to claim 1, characterized in that: The storage hopper (1) is a rectangular frame structure with openings at both ends, and the storage hopper (1) and the discharge hopper (2) are fixedly connected via a flange.

5. The automatic feeding system for an injection molding machine according to claim 1, characterized in that: The length of the rotating shaft (51) is greater than the length of the sleeve (52), and the length of the material distribution hopper (53) is equal to the length of the sleeve (52).

6. The automatic feeding system for an injection molding machine according to claim 1, characterized in that: The end of the feed pipe (4) is connected to an external pumping device.

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