Parallel ejection mechanism

Abstract

The utility model discloses a parallel ejection mechanism which comprises a movable mold frame, a plurality of guide holes are formed in one side of the movable mold frame, ejection rods are arranged in the guide holes in a telescopic mode, an ejection plate is arranged in the middle of the movable mold frame and connected with the ejection rods, and a transmission assembly and a supporting guide assembly are symmetrically arranged in the middle of the ejection plate. A driving assembly is arranged on one side of the movable mold frame and drives the transmission assembly, lead screws and guiding optical shafts are symmetrically distributed, a control motor drives the lead screws on the two sides to synchronously rotate forwards and backwards, a ball nut drives a top plate to move along the lead screws, and meanwhile a linear bearing is used for supporting and guiding along the guiding optical shafts. Radial loads of the ejector plate and the ejector rod are borne through the linear bearing and the guide optical shaft, the lead screw and the ball nut only bear axial loads, then friction heat and noise generated in the operation process of the lead screw and the ball nut are reduced, and therefore the service life of the lead screw and the service life of the ball nut are prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of ejection equipment of injection molding machines, in particular to a parallel ejection mechanism. Background Technique

[0002] An injection molding machine, also known as an injection molding machine or an injection machine, is the main molding equipment for making various shaped plastic products from thermoplastic or thermosetting plastics using plastic molding dies. With the development of all-electric injection molding machines, during the reciprocating process of the ejection mechanism, the ejection bushing and the ejection guide rod rub against each other. Since the bushing material is relatively soft, the increased gap due to long-term reciprocating friction will affect the balance of the top plate. Moreover, the current method of using a copper alloy graphite bushing and a guide rod has a relatively large clearance fit, and the added lubricating grease is not easy to store and easily flows out from the mating gaps, resulting in oil stains. Also, due to the relatively large gap in the guiding mechanism, it cannot effectively support the weight of the ejection mechanism, causing the ball screw to bear a large load and frictional force, and also generating excessive frictional heat and noise during the operation of the ball screw, thus affecting the service life of the ball screw. Content of the Utility Model

[0003] The purpose of the utility model is to provide a parallel ejection mechanism to solve the problems raised in the above background technique.

[0004] To achieve the above purpose, the utility model provides the following technical solution: A parallel ejection mechanism includes a moving die holder. A plurality of guiding holes are opened on one side of the moving die holder. An ejection rod is telescopically arranged in the guiding holes. A top plate is connected to the ejection rod in the middle of the moving die holder. A transmission component and a support guiding component are symmetrically arranged in the middle of the top plate respectively. A driving component is arranged on one side of the moving die holder to drive the transmission component.

[0005] Preferably, one end of the ejection rod is provided with a threaded joint.

[0006] Preferably, a threaded hole is provided in the top plate for connecting with the threaded joint, and fixing holes are penetrated through the four corners of the top plate.

[0007] Preferably, the transmission component includes a lead screw penetrating through one diagonal of the top plate. A ball nut fixedly connected to the top plate is arranged on the outer wall of the lead screw. A bearing mounting seat for mounting the lead screw is arranged on the side of the moving die holder. A plurality of bearings are arranged in the middle of the bearing mounting seat. A bearing gland is arranged on one side of the bearing mounting seat. The lead screw is sleeved with a skeleton oil seal on both sides of the bearing mounting seat, and a locking nut is arranged on the lead screw on one side of the skeleton oil seal.

[0008] Preferably, the support and guiding assembly includes guiding optical axes arranged diagonally through the other side of the top plate. The guiding optical axes are installed in the middle of the moving die carrier through fixing plates. Linear bearings are movably arranged on the outer circumferential walls of the guiding optical axes. End caps are respectively connected to both ends of the linear bearings on the top plate. Dust-proof rings and O-rings are respectively arranged at the joints where the end caps are in contact with the guiding optical axes and the top plate.

[0009] Preferably, the driving assembly includes a motor mounting plate arranged on one side of the moving die carrier. A motor is arranged on the motor mounting plate. Belt pulleys are fixedly arranged at the output end of the motor and one end of the lead screw. An idler shaft is fixedly arranged on the side of the moving die carrier. An idler is rotatably arranged on the outer circumferential wall of the idler shaft. The belt pulley and the idler are connected by a belt for transmission.

[0010] The beneficial effects of the present utility model are as follows:

[0011] 1. By symmetrically arranging the lead screws and guiding optical axes respectively, controlling the motor to drive the two lead screws to rotate forward and reverse synchronously, enabling the ball nut to drive the top plate to move along the lead screw. At the same time, it is supported and guided along the guiding optical axis through the linear bearing, so that the linear bearing and the guiding optical axis bear the radial load of the top plate and the ejector rod, and the lead screw and the ball nut only bear the axial load, thereby reducing the frictional heat and noise generated during the operation of the lead screw and the ball nut, and thus extending the service life of the lead screw and the ball nut.

[0012] 2. The linear bearing drives the top plate to linearly guide and slide along the guiding optical axis. Since the steel balls bearing the load in the linear bearing are in point contact with the guiding optical axis, a light linear motion can be achieved under the condition of the minimum frictional resistance.

[0013] 3. By filling the cavities of the end caps on both sides of the linear bearing with lubricating grease, and protecting the lubricating grease from flowing out easily through the O-ring and the dust-proof ring, the lubricating grease is stored in the cavity of the end cap for a long time, enabling the linear bearing to be fully lubricated and extending the service life of the linear bearing, and preventing pollution caused by the overflow of the lubricating grease. Description of the Drawings

[0014] Figure 1 It is a first - perspective three - dimensional structural schematic diagram of an embodiment of the present utility model;

[0015] Figure 2 It is a second - perspective three - dimensional structural schematic diagram of an embodiment of the present utility model;

[0016] Figure 3 It is a sectional three - dimensional structural schematic diagram of an embodiment of the present utility model;

[0017] Figure 4 It is a three - dimensional structural schematic diagram of the top plate in an embodiment of the present utility model;

[0018] Figure 5 Schematic three-dimensional structure diagram of the ejector rod in the embodiment of the present utility model;

[0019] Figure 6 Enlarged structure diagram of part A in the embodiment of the present utility model;

[0020] Figure 7 Enlarged structure diagram of part B in the embodiment of the present utility model.

[0021] In the figure: 1, moving die holder; 2, guiding hole; 3, ejector rod; 31, threaded joint; 4, top plate; 41, threaded hole; 42, fixing hole; 5, transmission assembly; 51, lead screw; 52, ball nut; 53, bearing mounting seat; 54, bearing; 55, bearing gland; 56, skeleton oil seal; 57, lock nut; 6, support guiding assembly; 61, guiding optical axis; 62, fixing plate; 63, linear bearing; 64, end cover; 65, dust-proof ring; 66, O-ring; 7, driving assembly; 71, motor mounting plate; 72, motor; 73, belt pulley; 74, idler shaft; 75, idler pulley; 76, belt. Specific embodiments

[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0023] Please refer to Figures 1-7 , the present utility model provides a parallel ejection mechanism, including a moving die holder 1. A plurality of guiding holes 2 are opened on one side of the moving die holder 1. An ejector rod 3 is telescopically arranged in the guiding hole 2. A top plate 4 is connected to the ejector rod 3 in the middle of the moving die holder 1. A transmission assembly 5 and a support guiding assembly 6 are symmetrically arranged in the middle of the top plate 4 respectively. A driving assembly 7 is arranged on one side of the moving die holder 1 to drive the transmission assembly 5. By controlling the forward and reverse rotation of the motor 72 in the driving assembly 7, and then through the transmission of the belt 76, belt pulley 73 and idler pulley 75, the lead screw 51 in the transmission assembly 5 is driven to rotate, so that the ball nut 52 drives the top plate 4 to move along the lead screw 51. At the same time, the linear bearing 63 in the support guiding assembly 6 drives the top plate 4 to reciprocate along the guiding optical axis 61, and then drives a plurality of ejector rods 3 to telescopically extend and retract in parallel along the corresponding guiding holes 2, so as to eject and demold the plastic product.

[0024] Such as Figure 5As shown, specifically, one end of the ejector rod 3 is provided with a threaded joint 31. The ejector rod 3 is passed through the guide hole 2, and is threadedly connected to the corresponding threaded hole 41 in the middle of the top plate 4 through the threaded joint 31, so as to quickly install the ejector rod 3 on the top plate 4, facilitating driving the top plate 4 to move and driving a plurality of ejector rods 3 to expand and contract along the corresponding guide holes 2.

[0025] As Figure 4 shown, specifically, the top plate 4 is provided with a threaded hole 41 for connecting with the threaded joint 31, and fixing holes 42 are respectively formed through the four corners of the top. Through the threaded hole 41, it is convenient to install the ejector rod 3 in the middle of the top plate 4. Through the fixing holes 42, it is convenient for the top plate 4 to be fixedly connected to the transmission assembly 5 and the support and guide assembly 6 respectively. The transmission assembly 5 drives the top plate 4 to move, and at the same time, the support and guide assembly 6 provides support and guidance, so that the guide optical axis 61 and the linear bearing 63 in the support and guide assembly 6 bear the radial load of the top plate 4 and the ejector rod 3, and the ball screw 51 in the transmission assembly 5 only bears the axial load, thereby reducing the frictional heat and noise generated during the operation of the ball screw 51, and thus extending the service life of the screw 51 and the ball nut 52.

[0026] As Figure 6 shown, specifically, the transmission assembly 5 includes a screw 51 arranged diagonally through one side of the top plate 4. A ball nut 52 fixedly connected to the top plate 4 is arranged on the outer circumferential wall of the screw 51. A bearing mounting seat 53 for mounting the screw 51 is arranged on the side of the moving die holder 1. A plurality of bearings 54 are arranged in the middle of the bearing mounting seat 53. A bearing gland 55 is arranged on one side of the bearing mounting seat 53. Skeleton oil seals 56 are sleeved on both sides of the bearing mounting seat 53 where the screw 51 is located. A locking nut 57 is arranged on one side of the skeleton oil seal 56 where the screw 51 is located. By passing one end of the two screws 51 through the bearing mounting seat 53, the screw 51 is passed through the top plate 4 and installed in the middle of the moving die holder 1. By installing the ball nut 52 in the middle of the fixing hole 42 at one diagonal of the top plate 4, it is convenient to drive the screw 51 to rotate and drive the top plate 4 to move, so that the ejector rod 3 expands and contracts along the guide hole 2, and the plastic product is ejected to realize demoulding.

[0027] As Figure 7As shown, specifically, the support guide assembly 6 includes a guide light shaft 61 that passes through the other side of the top plate 4 and is diagonally arranged. The guide light shaft 61 is installed in the middle of the movable mold frame 1 through a fixing plate 62. A linear bearing 63 is movable on the outer circular wall of the guide light shaft 61. The two ends of the linear bearing 63 are respectively connected to the top plate 4 and are provided with end covers 64. The end covers 64 are respectively provided with dust rings 65 and O-rings 66 at the joints between the guide light shaft 61 and the top plate 4. The guide light shafts 61 on both sides are fixed by the fixing plate 62. It penetrates the top plate 4 and is fixedly installed to the middle of the movable mold frame 1, and then the linear bearing 63 is fixedly installed to the middle of the fixing hole 42 at the other diagonal side of the top plate 4 through the end covers 64 on both sides, and then the cavities of the end covers 64 on both sides of the linear bearing 63 are filled with lubricating grease, and the lubricating grease is protected by O-rings 66 and dust rings 65 so that the lubricating grease is not easy to flow out, thereby ensuring that the lubricating grease is kept in the cavity of the end covers 64 for a long time, so that the linear bearing 63 is fully lubricated to extend the life of the linear bearing 63, and prevent the lubricating grease from overflowing and causing pollution.

[0028] Specifically, the ball nut 52 and the linear bearing 63 are both prior art, so the specific structures are not described in detail.

[0029] like Figure 1 and Figure 2 As shown, specifically, the driving assembly 7 includes a motor mounting plate 71 provided on one side of the movable mold frame 1, the motor mounting plate 71 is provided with a motor 72, the output end of the motor 72 and one end of the lead screw 51 are fixedly provided with a pulley 73, the side of the movable mold frame 1 is fixedly provided with an idler shaft 74, the outer circular wall of the idler shaft 74 is rotatably provided with an idler 75, the pulley 73 and the idler 75 are connected by a belt 76, and the motor 72 is controlled to rotate forward and reverse, and then the pulley 73, the idler 75 and the belt 76 are driven to drive the lead screws 51 on both sides of the top plate 4 to rotate synchronously, so that the ball nuts 52 on both sides drive the top plate 4 to reciprocate along the lead screw 51, and during the movement of the top plate 4, the linear bearing 63 connected to the other diagonal side simultaneously moves along the guide light axis 61, thereby reducing the load of the lead screw 51 and improving the stability and reliability of the top plate 4 during the movement.

[0030] Working principle of the utility model: when in use, the motor 72 is controlled to drive the pulley 73 at the conveying end to rotate forward and reverse, and then the pulley 73 at the end of the screw 51 and the idler wheel 75 of the idler shaft 74 are driven to rotate through the belt 76, and then the screws 51 on both sides are driven to rotate synchronously, so that the top plate 4 reciprocates along the screw 51 through the ball nut 52 diagonally connected on one side, and is also supported and guided by the linear bearing 63 diagonally connected on the other side, and reciprocates along the guide optical axis 61, thereby improving the stability of the top plate 4 during movement, and then driving a plurality of ejector rods 3 to extend and retract in parallel along the corresponding guide holes 2, thereby ejecting the plastic product from the mold.

[0031] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions or improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A parallel ejection mechanism, comprising a movable mold frame (1), characterized in that: A plurality of guide holes (2) are provided on one side of the movable mold frame (1), and an ejector rod (3) is telescopically provided in the guide hole (2). A top plate (4) is provided in the middle of the movable mold frame (1) and is connected to the ejector rod (3). A transmission assembly (5) and a support guide assembly (6) are symmetrically provided in the middle of the top plate (4). A drive assembly (7) is provided on one side of the movable mold frame (1) for driving the transmission assembly (5).

2. A parallel ejection mechanism according to claim 1, characterized in that; A threaded joint (31) is provided at one end of the ejector rod (3).

3. A parallel ejection mechanism according to claim 2, characterized in that; The top plate (4) is connected to the threaded joint (31) and is provided with a threaded hole (41), and fixing holes (42) are provided through the four corners of the top plate (4).

4. A parallel ejection mechanism according to claim 1, characterized in that; The transmission assembly (5) comprises a lead screw (51) which passes through one side of the top plate (4) and is diagonally arranged thereon; a ball nut (52) which is fixedly connected to the top plate (4) is arranged on the outer circumferential wall of the lead screw (51); a bearing mounting seat (53) for mounting the lead screw (51) is arranged on the side of the movable mold frame (1); a plurality of bearings (54) are arranged in the middle of the bearing mounting seat (53); a bearing pressure cover (55) is arranged on one side of the bearing mounting seat (53); skeleton oil seals (56) are sleeved on both sides of the lead screw (51) located on the bearing mounting seat (53); and a locking nut (57) is arranged on the skeleton oil seal (56) on one side of the lead screw (51).

5. A parallel ejection mechanism according to claim 1, characterized in that; The support guide assembly (6) comprises a guide light shaft (61) which passes through the other side of the top plate (4) and is diagonally arranged. The guide light shaft (61) is installed in the middle of the movable mold frame (1) through a fixing plate (62). A linear bearing (63) is movably arranged on the outer circular wall of the guide light shaft (61). The two ends of the linear bearing (63) are respectively connected to the top plate (4) and are provided with end covers (64). The end cover (64) is respectively provided with a dust ring (65) and an O-ring (66) at the joint between the guide light shaft (61) and the top plate (4).

6. A parallel ejection mechanism according to claim 4, characterized in that; The driving assembly (7) comprises a motor mounting plate (71) provided on one side of the movable mold frame (1), the motor mounting plate (71) being provided with a motor (72), a pulley (73) being fixedly provided at the output end of the motor (72) and one end of the lead screw (51), an idler shaft (74) being fixedly provided on the side of the movable mold frame (1), an idler wheel (75) being rotatably provided on the outer circular wall of the idler shaft (74), and the pulley (73) and the idler wheel (75) being connected by a belt (76) for transmission.

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