A secondary ejection mechanism and its ejection and stripping method

Abstract

The application discloses a two-stage ejection mechanism, which comprises a primary driving device, a secondary driving device and a telescopic ejection device arranged on a movable die plate. The telescopic ejection device is provided with an ejection plate, a fixed ejection rod arranged vertically on the ejection plate and a telescopic ejection rod for adjusting the ejection stroke. The ejection plate is driven by the primary driving device to make an ejection and retreat movement along the axial direction of the fixed ejection rod. The ejection plate drives the secondary driving device to make a synchronous axial movement. The telescopic ejection rod is driven by the secondary driving device to make a two-stage ejection and retreat movement. The application also discloses an ejection and retreat method of the two-stage ejection mechanism. The two-stage ejection mechanism greatly improves the ejection stroke of an injection molding machine. The ejection stroke can be controlled according to the requirements of an ejection part, and the ejection and retreat setting with a large stroke and an adjustable stroke is realized. The working efficiency is greatly improved. The device has good generalization performance and linkage, and is stable in operation and convenient and fast in operation.

Description

Technical Field

[0001] This invention relates to the field of injection molding machine technology, and in particular to a two-stage ejection mechanism and its ejection and retraction method. Background Technology

[0002] Small and medium-sized electric toggle-type injection molding machines often have limited ejection strokes due to mold plate size constraints. Some plastic products require injection molding machines with low clamping force and long ejection strokes. When selecting an injection molding machine, one can only choose one with clamping force exceeding the requirement based on the ejection stroke, resulting in increased purchase costs and excessive clamping force.

[0003] Chinese patent document CN202640717U discloses a fully electric main and auxiliary multi-ejector injection mold mechanism, including main and auxiliary ejection transmission mechanisms driven by servo motors. The ejector plate of this invention is driven jointly by the main ejection transmission mechanism and the auxiliary ejection transmission mechanism, ensuring sufficient ejection force while also making the ejection force uniform throughout the entire mold mechanism, thus avoiding damage to the molded parts. Furthermore, both main and auxiliary ejection are driven by servo motors, which offer high operating efficiency, high power transmission, low noise, stable operation, precise positioning, low energy consumption, and environmental friendliness. Moreover, by using servo motors, the ejection position and speed of the ejection mechanism can be controlled during mold opening, ensuring that the movement speed and working frequency of the ejector plate are coordinated with the opening and closing speed of the mold plate. The stroke of the ejector plate is adapted to the thickness of the mold, effectively controlling the ejection time of the molded parts, minimizing the work cycle, and improving machine production efficiency.

[0004] The above technical solution provides ejection force by using an auxiliary ejection transmission mechanism, but it cannot increase the ejection stroke and cannot solve the problem of small ejection stroke in small and medium-sized electric toggle-type injection molding machines. Summary of the Invention

[0005] The purpose of this invention is to solve the problem of limited ejection stroke in existing small and medium-sized electric toggle-type injection molding machines. It provides a two-stage ejection mechanism and its ejection and retraction method that can effectively increase the ejection stroke of the injection molding machine while ensuring clamping force. This mechanism can achieve large-stroke, adjustable-stroke ejection and retraction, high working efficiency, good equipment versatility, stable operation, good ejection effect, and convenient and fast operation.

[0006] The technical solution adopted by this invention to achieve its first objective is: a two-stage ejection mechanism, comprising a primary drive device, a secondary drive device, and a telescopic ejection device mounted on a moving template. The telescopic ejection device includes an ejection plate, a fixed ejection rod vertically mounted on the ejection plate, and a telescopic ejection rod for adjusting the ejection and retraction stroke. The ejection plate is driven by the primary drive device to perform ejection and retraction movements along the axial direction of the fixed ejection rod, and the ejection plate drives the secondary drive device to move synchronously axially. The telescopic ejection rod is driven by the secondary drive device to perform secondary ejection and retraction movements. This two-stage ejection mechanism achieves step-by-step driving of the telescopic ejection device through the primary and secondary drive devices. When a primary ejection and retraction movement is required, the primary drive device drives the ejection plate to move axially. The movement of the ejection plate drives the fixed ejection rod and the telescopic ejection rod to move synchronously towards the moving template, realizing the primary ejection operation of the injection molded part. At this time, the injection molded part can be ejected outward by the fixed ejection rod, achieving the primary ejection movement. When the primary ejection motion cannot completely eject the injection molded part, i.e., the ejection stroke does not meet the ejection requirements, the secondary ejection device is activated. This device drives the telescopic ejector rod to extend and retract axially outward, continuing the ejection motion—this is the secondary ejection motion. This extends the ejection stroke and ensures effective ejection of the injection molded part. Adjusting the telescopic ejector rod's ejection and retraction stroke allows for effective control of the ejection and retraction strokes. This can be tailored to the different ejection requirements of different injection molding machines, achieving an adjustable and controllable ejection stroke design based on the original clamping force, thus realizing equipment versatility. When a retraction operation is required, the secondary drive device first drives the telescopic ejector rod to achieve secondary retraction, and then the primary drive device drives the ejector plate to achieve primary retraction. Simultaneously, the secondary drive device resets with the primary retraction motion. This two-stage ejection mechanism can greatly increase the ejection stroke of the injection molding machine while ensuring the existing or original clamping force. The ejection stroke can be controlled according to the needs of the ejected part, realizing a large stroke and adjustable stroke ejection and retraction setting, which greatly improves work efficiency. The equipment has good versatility, and the two-stage ejection mechanism has good linkage performance, stable operation, good ejection effect, and convenient and fast operation.

[0007] Preferably, the primary drive device includes a first servo motor and a primary transmission mechanism. The primary transmission mechanism includes a ball screw pair, in which the ball nut is connected to the ejector plate and drives the ejector plate to move axially. The primary drive device uses a first servo motor for smooth and accurate operation and force transmission. The primary transmission mechanism uses a ball screw pair to achieve synchronous movement, ensuring smooth force transmission and good performance. This allows the ejector plate to move smoothly and accurately, thereby ejecting the injection molded part without causing damage.

[0008] Preferably, the primary transmission mechanism employs belt drive, with a first driving pulley mounted on the first servo motor and a first driven pulley mounted on the ball screw assembly. A first synchronous belt is wound around both the first driving pulley and the first driven pulley. Belt drive provides smooth transmission and has a simple structure.

[0009] Preferably, the telescopic ejector rod includes a slotted ejector bearing bracket fixedly connected to the ejector plate, an ejector rod rotating shaft rotatably mounted on the ejector bearing bracket, and a rotating sleeve sleeved on the ejector rod rotating shaft and extending and retracting axially. The telescopic ejector rod mainly uses a slotted ejector bearing bracket to rotatably mount the ejector rod rotating shaft on the ejector plate, while a rotating sleeve is sleeved on the ejector rod rotating shaft. The rotating sleeve moves axially under the drive of the ejector rod rotating shaft, thus achieving the telescopic ejection function.

[0010] Preferably, an ejector drive gear is provided on the ejector rotating shaft facing the slotted end. The telescopic ejection device also includes an ejection gear on the ejection plate for driving the ejector drive gear to rotate. The ejection gear is connected to the secondary drive device via a gear drive shaft and is driven to rotate by the secondary drive device. To achieve smooth ejection, an ejector drive gear is provided on the ejector rotating shaft, which is driven to rotate synchronously by the ejection gear on the ejection plate. The rotation of the ejector drive gear drives the ejector drive shaft connected to it to rotate, and the rotation of the ejector drive shaft causes the rotating sleeve to move axially, thereby realizing the telescopic secondary ejection motion. Through gear transmission, the rotational motion is converted into the axial motion of the rotating sleeve, realizing the controllability, precision, and adjustability of the telescopic ejection and retraction motion, as well as the ejection stroke, which can meet the ejection and retraction design requirements of elbow-type injection molding machines with different ejection strokes.

[0011] Preferably, the push rod rotating shaft is a rotating shaft with double helical grooves, and the ejector bearing bracket is also provided with a rotating sleeve limiting device. In order to convert the rotational motion of the push rod rotating shaft into the axial linear motion of the rotating sleeve, the push rod rotating shaft is a rotating shaft with double helical grooves, and a rotating sleeve limiting device is used to limit the circumferential motion of the rotating sleeve, so that the rotating sleeve only performs axial linear motion.

[0012] Preferably, the rotating sleeve limiting device includes two symmetrically arranged guide plates. Each guide plate has a groove, and a sliding key is slidably disposed within the groove. The rotating sleeve has a sliding key limiting hole, through which the sliding key passes and engages with the double helical groove to limit the circumferential movement of the rotating sleeve. The rotating sleeve limiting device primarily uses the two grooved guide plates and the sliding key disposed within the groove and the double helical groove to limit the circumferential rotation of the rotating sleeve, thereby achieving the axial linear movement of the rotating sleeve.

[0013] Preferably, the secondary drive device includes a second servo motor, a secondary transmission mechanism, and a tertiary transmission mechanism. The secondary drive device can achieve the telescopic secondary ejection and retraction motion by using a secondary transmission mechanism driven by a second servo motor and a tertiary transmission mechanism driven by the secondary transmission mechanism.

[0014] Preferably, the secondary and tertiary transmission mechanisms are both belt drives, and the tertiary transmission mechanism and the ejector plate are axially synchronized through a synchronizing mechanism. To achieve synchronized ejection motion, the tertiary transmission mechanism and the ejector plate are axially synchronized through a synchronizing mechanism, thus ensuring synchronization between the tertiary transmission mechanism and the ejector plate during the primary ejection and retraction process.

[0015] Preferably, the secondary transmission mechanism includes a second driving pulley mounted on the output shaft of the second servo motor, a synchronous transmission shaft mounted on the moving template, a second driven pulley mounted on the synchronous transmission shaft, and a second synchronous belt wound around the second driving pulley and the second driven pulley. The secondary transmission mechanism primarily uses the second servo motor to drive the second driving pulley to rotate, thereby driving the synchronous transmission shaft to rotate via the second synchronous belt, transmitting power to the synchronous transmission shaft, and ultimately causing the synchronous transmission shaft to drive the movement of the three-way transmission mechanism.

[0016] Preferably, the three-stage transmission mechanism includes a third driving pulley slidably mounted on the synchronous transmission shaft, a third driven pulley mounted on the telescopic ejector device, and a third synchronous belt wound around the third driving pulley and the third driven pulley; the synchronization mechanism includes a connecting bracket connecting the third driving pulley and the ejector plate. The three-stage transmission mechanism needs to perform ejection and retraction movements synchronously with the ejector plate. Therefore, the third driving pulley is slidably mounted on the synchronous transmission shaft via a sliding key, and the third driving pulley is connected to the ejector plate via a connecting bracket. The movement of the ejector plate drives the third driving pulley to move axially along the synchronous transmission shaft, achieving synchronous linkage.

[0017] Preferably, the secondary drive device includes a second servo motor and a secondary transmission mechanism. Alternatively, the secondary drive device can also be implemented by the second servo motor driving the secondary transmission mechanism.

[0018] Preferably, the secondary transmission mechanism includes a second driving pulley slidably mounted on the output shaft of the second servo motor, a second driven pulley mounted on the telescopic ejector, and a second synchronous belt wound around the second driving pulley and the second driven pulley. The second driving pulley and the ejector plate are axially synchronized via a connecting bracket. To achieve synchronous movement between the secondary transmission mechanism and the ejector plate, the second driving pulley is slidably connected to the output shaft of the second servo motor via a key, and the second driving pulley is connected to the ejector plate via a connecting bracket. The ejector plate's ejection and retraction movements drive the second driving pulley to move axially along the motor output shaft synchronously, achieving synchronous linkage. Using only a secondary transmission mechanism simplifies the structure and improves transmission efficiency.

[0019] The technical solution adopted by this invention to achieve its second objective is: a method for ejecting and retracting a two-stage ejection mechanism, comprising the following steps:

[0020] Step 1: When performing the first-stage ejection and retraction action, the first servo motor drives the ball screw pair to rotate through the first driving pulley, the first driven pulley and the first synchronous belt. The screw in the ball screw pair rotates, and the ball nut drives the ejection plate and the fixed ejection rod and telescopic ejection rod on the ejection plate to move to realize the first-stage ejection and retraction action.

[0021] Step 2: After the first-stage ejection action or before the first-stage retraction action, the second servo motor drives the ejection gear to rotate through the second-stage transmission mechanism and the third-stage transmission mechanism, or through the second-stage transmission mechanism. The ejection gear drives the ejector transmission gear on the telescopic ejector rod to rotate, thereby causing the ejector rod rotation shaft to rotate. Under the restriction of the sliding key, the rotating sleeve performs axial movement to realize the second-stage ejection and retraction action.

[0022] The ejection and retraction method of this two-stage ejection mechanism is easy to operate and has good linkage performance. It can adjust and control the stroke of the ejection mechanism according to the ejection stroke of different injection molding machines, thereby realizing a large stroke and adjustable stroke ejection setting based on the original clamping force, which greatly improves work efficiency and the universal design of the equipment.

[0023] The beneficial effects of this invention are: the two-stage ejection mechanism can greatly increase the ejection stroke of the injection molding machine while ensuring the existing or original clamping force. The ejection stroke can be controlled according to the needs of the ejected part, realizing a large stroke and adjustable stroke ejection and retraction setting, which greatly improves work efficiency, has good equipment versatility, and the two-stage ejection mechanism has good linkage performance, runs smoothly, has good ejection effect, and is convenient and fast to operate. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of one structure of the two-stage ejection mechanism of the present invention;

[0025] Figure 2 This is a schematic diagram of the secondary ejection mechanism of the present invention from another angle;

[0026] Figure 3 This is a cross-sectional view of the secondary ejection mechanism of the present invention;

[0027] Figure 4 This is another cross-sectional view of the secondary ejection mechanism of the present invention;

[0028] Figure 5 This is the third cross-sectional view of the secondary ejection mechanism of the present invention;

[0029] Figure 6 This is a schematic diagram of one structure of the moving template in this invention;

[0030] Figure 7 This is a schematic diagram of a two-stage ejection mechanism (removal of the moving template) of the present invention;

[0031] Figure 8 This is a structural schematic diagram of the secondary ejection mechanism (removing the moving template) of the present invention from another angle;

[0032] Figure 9 This is a schematic diagram of one structure of the primary drive device in this invention;

[0033] Figure 10 This is a schematic diagram of one structure of the secondary drive device in this invention;

[0034] Figure 11 This is a schematic diagram of a telescopic ejection device in this invention;

[0035] Figure 12 This is a schematic diagram of a structure in which the ejector gear meshes with the telescopic ejector rod in this invention;

[0036] Figure 13 This is a schematic diagram of one structure of the telescopic ejector rod in this invention;

[0037] Figure 14 This is a schematic diagram of another angle of the telescopic ejector rod in this invention;

[0038] Figure 15 This is a schematic diagram illustrating a connection relationship between the third driving pulley and the synchronous transmission shaft in this invention;

[0039] Figure 16 This is a schematic diagram of a two-stage ejection mechanism in Embodiment 2 of the present invention;

[0040] Figure 17 This is a schematic diagram of a structure connecting the secondary drive device and the telescopic ejection device in Embodiment 2 of the present invention;

[0041] Figure 18 This is a schematic diagram of a structure in Embodiment 2 of the present invention showing the connection between the secondary drive device and the top plate;

[0042] In the diagram: 1. First-stage drive unit; 100. First-stage transmission mechanism; 101. First servo motor; 102. First motor bracket; 103. First motor mounting plate; 104. Tensioner wheel; 105. First synchronous belt; 106. Lead screw bearing housing; 107. Ball screw pair; 108. First driving pulley; 109. First driven pulley; 110. Adjusting groove; 111. Adjusting bolt; 112. Lead screw; 113. Ball nut; 114. Lead screw bearing.

[0043] 2. Secondary drive unit; 201. Secondary servo motor; 202. Secondary transmission mechanism; 203. Tertiary transmission mechanism; 204. Secondary drive pulley; 205. Synchronous transmission shaft; 206. Secondary driven pulley; 207. Second synchronous belt; 208. Second motor bracket; 209. Second motor mounting plate; 210. Adjustment groove; 211. Transmission bearing seat; 212. Pad; 213. Third driven pulley; 214. Third drive pulley; 215. Third synchronous belt; 216. Sliding key; 217. Connecting bracket;

[0044] 3. Telescopic ejection device, 301. Ejection plate, 302. Fixed ejection rod, 303. Guide rod, 304. Ejection gear, 305. Telescopic ejection rod, 306. Ejection part, 307. Screw pair mounting part, 308. Ejection gear mounting hole, 309. Gear drive shaft, 310. Fixed ejection rod mounting hole, 311. Screw pair mounting hole, 312. Guide rod mounting part, 313. Guide rod mounting hole, 314. Ejection bearing bracket, 315. Ejection rod drive gear, 316. Ejection rod rotating shaft, 317. Rotating sleeve, 318. Sliding key, 319. Guide plate, 320. Slot, 321. Slide groove, 322. Double spiral groove, 323. Sliding key limiting hole;

[0045] 4. Moving template; 40. Center hole; 41. Closing template; 42. Mounting body; 43. Ejection cavity; 44. Fixed ejection rod; 45. Telescopic ejection hole; 46. Guide hole; 47. First motor mounting base; 48. Second motor mounting base; 49. Pull rod hole.

[0046] 5. Rotating sleeve limit device. Detailed Implementation

[0047] The present invention will now be described in detail with reference to specific embodiments and accompanying drawings.

[0048] Example 1:

[0049] In Figure 1, Figure 2 , Figure 3In the illustrated embodiment, a two-stage ejection mechanism is provided on the moving template 4, specifically including a primary drive device 1, a secondary drive device 2, and a telescopic ejection device 3. The telescopic ejection device 3 includes an ejection plate 301, a fixed ejection rod 302 vertically mounted on the ejection plate 301, and a telescopic ejection rod 305 for adjusting the ejection and retraction stroke. The ejection plate 301 is driven by the primary drive device 1 to perform ejection and retraction actions along the axial direction of the fixed ejection rod 302, and the ejection plate 301 drives the secondary drive device 2 to perform synchronous axial movement. The telescopic ejection rod 305 is driven by the secondary drive device 2 to perform a two-stage ejection and retraction action.

[0050] like Figure 6 As shown, the movable template 4 includes an integrally formed composite template 41 and mounting body 42. The composite template 41 and mounting body 42 form a square three-dimensional structure. The movable template 4 has an ejection cavity 43 inside, and a central hole 40 on it. Several fixed ejection rods 44 are arranged in groups around the central hole along the axial direction on the movable template 4, with two fixed ejection rods in each group. Multiple telescopic ejection holes 45 are provided on the inner side of the fixed ejection rods 44 near the central hole 40. The telescopic ejection holes 45 are evenly distributed around the central hole 40. Two guide holes 46 are also provided on the movable template 4 outside the telescopic ejection holes 45, and the two guide holes 46 are arranged along the same pair of top lines on the composite template.

[0051] A first motor mounting base 47 and a second motor mounting base 48 are respectively provided on both sides of the mounting body 42.

[0052] Tie rod holes 49 are provided at the four corners of the moving template 4 to facilitate the installation of the locking tie rod.

[0053] like Figure 7 , Figure 9 The primary drive device 1 includes a first servo motor 101 and a primary transmission mechanism 100.

[0054] The first servo motor 101 is mounted on the outside of the moving template 4 via a first motor bracket 102 and a first motor mounting plate 103.

[0055] The primary transmission mechanism 100 includes a first driving pulley 108 mounted on the output shaft of the first servo motor 101, two sets of ball screw pairs 107, a first driven pulley 109 mounted on the ball screw pairs 107, and a first synchronous belt 105 wound around the first driving pulley 108 and the first driven pulley 109.

[0056] The first motor mounting plate 103 is a movable and adjustable structure. The tension of the first synchronous belt 105 is adjusted by adjusting the position of the first motor mounting plate 103. Specifically, there is an adjusting groove 110 on the first motor mounting plate 103. The length of the adjusting groove 110 is set in the horizontal direction. An adjusting bolt 111 is set inside the adjusting groove. The position of the first motor mounting plate is adjusted by adjusting the bolt, thereby adjusting the tension of the first synchronous belt 105.

[0057] A tensioning pulley 104 is also provided on the moving template 4. The first synchronous belt 105 is wound around the tensioning pulley 104, and the wrap angle between the first synchronous belt 105 and the first driving pulley 108 and the first driven pulley 109 is adjusted by the tensioning pulley.

[0058] Two sets of ball screw pairs 107 are provided. Each ball screw pair 107 is rotatably connected to the moving template 4 via a screw bearing seat 106 and a screw bearing 114 inside the bearing seat. It is also connected to the ejector plate 301 in the telescopic ejector device 3 and can drive the ejector plate 301 to move. The other end of the ball screw pair 107 is fixed inside the ejector cavity 43 of the moving template.

[0059] like Figure 7 As shown, specifically, the ball screw assembly 107 includes a screw 112, a ball nut 113, and balls disposed between the screw 112 and the ball nut 113. The ball nut 113 is fixedly connected to the ejector plate 301 and drives the ejector plate 301 to move.

[0060] The rotation of the first servo motor 101 drives the first active pulley to rotate, which in turn drives the two sets of ball screw pairs 7 to move through the first synchronous belt 105 and the first driven pulley 108, thereby driving the ejector plate to perform a first-stage ejection motion.

[0061] like Figure 4 , Figure 8 , Figure 10 As shown, the secondary drive device 2 is installed on the other side of the moving template 4 opposite to the primary drive device 1.

[0062] The secondary drive device 2 is connected to the telescopic ejection device 3 in a transmission manner and drives the telescopic ejection device 3 to perform telescopic ejection movement.

[0063] The secondary drive device 2 includes a second servo motor 201, a secondary transmission mechanism 202, and a tertiary transmission mechanism 203. The secondary transmission mechanism 202 and the tertiary transmission mechanism 203 are both belt drives, and the tertiary transmission mechanism 203 and the ejector plate 301 are axially synchronized through a synchronization mechanism.

[0064] The secondary transmission mechanism 202 includes a second driving pulley 204 mounted on the output shaft of the second servo motor 201, a synchronous transmission shaft 205 mounted on the moving template 4, a second driven pulley 206 mounted on the synchronous transmission shaft, and a second synchronous belt 207 wound around the second driving pulley 204 and the second driven pulley 206.

[0065] The second servo motor 201 is mounted on the other side of the moving template 4 via a second motor bracket 208 and a second motor mounting plate 209. The second motor mounting plate 209 has a movable and adjustable structure. An adjustment groove 210 is provided on the second motor mounting plate 209, with its length direction horizontal. An adjustment bolt is provided inside the adjustment groove. The position of the second motor mounting plate is adjusted by adjusting the bolt, thereby adjusting the tension of the second synchronous belt 207.

[0066] The synchronous transmission shaft 205 is mounted on the moving template 4 via two transmission bearing seats 211 and is parallel to the output shaft of the second servo motor 201. A pad 212 is installed between one of the transmission bearing seats 211 and the moving template 4.

[0067] The three-stage transmission mechanism 203 includes a third driven pulley 213 mounted on the telescopic ejector device 3, a third driving pulley 214 slidably mounted on the synchronous transmission shaft 205, and a third synchronous belt 215 wound around the third driving pulley 214 and the third driven pulley 213. The synchronization mechanism includes a connecting bracket 217 connecting the third driving pulley 214 and the ejector plate 301.

[0068] like Figure 15 As shown, the third drive pulley 214 on the synchronous transmission shaft 205 is mounted on the synchronous transmission shaft 205 via a sliding key 216. In this embodiment, the synchronization mechanism between the ejector plate and the three-stage transmission mechanism adopts a connecting bracket, that is, the third drive pulley 214 and the ejector plate 301 are connected by a connecting bracket 217. When the ejector plate 301 performs the first-stage ejection and ejection action, the third drive pulley 214 can follow the synchronous transmission shaft 205 to move axially, maintaining consistency with the third driven pulley 213 in axial position.

[0069] The second servo motor 201 is driven by the second synchronous belt 207 to drive the synchronous drive shaft 202. The synchronous drive shaft 205 is driven by the third synchronous belt 215 to drive the telescopic ejector device 3.

[0070] like Figure 11 , Figure 12As shown, the telescopic ejection device 3 includes an ejection plate 301 disposed inside the ejection cavity 43 of the moving template, an ejection gear 304 disposed at the center of the ejection plate 301, a plurality of fixed ejection rods 302 disposed perpendicular to the plate surface of the ejection plate 301, and a telescopic ejection rod 305 disposed parallel to the fixed ejection rods 302 on the ejection plate 301. The telescopic ejection rod 305 is disposed inside the fixed ejection rods 302.

[0071] The ejector plate 301 has a polygonal structure with four ejector portions 306. Each ejector portion 306 has two fixed ejector rod mounting holes 310, and the fixed ejector rod 302 is fixedly installed in the fixed ejector rod mounting hole 310.

[0072] Between two adjacent ejector portions 306, a lead screw mounting portion 307 and a guide rod mounting portion 312 are formed. The lead screw mounting portion 307 and the guide rod mounting portion 312 are arranged diagonally, that is, the lead screw mounting portion 307 is located on one diagonal of the ejector plate, and the guide rod mounting portion 312 is located on the other diagonal. A lead screw mounting hole 311 is provided on the lead screw mounting portion 307, and the ball screw assembly 107 is installed inside the lead screw mounting hole 311. A guide rod mounting hole 313 is provided on the guide rod mounting portion 312, and the guide rod 303 is installed inside the guide rod mounting hole 313.

[0073] An ejector gear mounting hole 308 is provided at the center of the ejector plate 301. A gear drive shaft 309 with an ejector gear 304 is installed inside the ejector gear mounting hole 308. The ejector gear 304 is located on the inner side of the ejector plate 301 facing the assembly template 41. The gear drive shaft 309 is rotatably mounted inside the ejector gear mounting hole 308 via bearings, and a third driven pulley 213 is mounted on the gear drive shaft 309. The ejector gear 304 can transmit power from the third driven pulley 213 to the telescopic ejector rod 305.

[0074] Four telescopic ejector rods 305 are provided around the ejector gear 304, which can mesh with the ejector gear. The other end of the telescopic ejector rod is movably inserted into the telescopic ejector hole 45 on the moving template.

[0075] Two fixed ejection rods 302 are provided on each ejection part 306 in a direction perpendicular to the ejection plate surface. The other end of the fixed ejection rod 302 is movably inserted into the fixed ejection rod 44 on the moving template.

[0076] Two guide rods 303 perpendicular to the ejector plate are provided on the mounting body 42 of the moving template at the position corresponding to the guide rod mounting part 312. The other end of the guide rod 303 is movably disposed in the guide rod mounting hole 313 and the guide hole 46 of the moving template 4 to realize the guiding function of the ejector mechanism.

[0077] like Figure 13 , Figure 14 As shown, the telescopic ejector rod 305 includes an ejector bearing bracket 314 fixedly connected to the ejector plate 301, an ejector rod rotating shaft 316 rotatably mounted on the ejector bearing bracket 314, a rotating sleeve 317 sleeved on the ejector rod rotating shaft 316 and extending and retracting axially, and an ejector rod transmission gear 315 mounted on the ejector rod rotating shaft 316.

[0078] The ejector bearing bracket 314 is also provided with a rotating sleeve limiting device 5, which includes a sliding key 318 slidably disposed on the guide plates 319 which are symmetrically arranged.

[0079] The ejector bearing bracket 314 has two symmetrical slots 320. Guide plates 319 are symmetrically arranged axially on the ejector bearing bracket 314. Each guide plate 319 has a sliding groove 321. A sliding key 318 is located inside the sliding groove 321, facing the inner side of the ejector rod rotation shaft 316. The sliding key 318 can slide along the sliding groove 321. The ejector rod rotation shaft 316 is a double-helix groove shaft. The other end of the sliding key 318 engages with the double-helix groove 322 on the ejector rod rotation shaft 316. A rotating sleeve 317 is fitted onto the end of the ejector rod rotation shaft 316 facing the moving template. A sliding key limiting hole 323 is provided on the rotating sleeve 317. The sliding key 318 passes through the sliding key limiting hole 323 and engages with the double-helix groove 322 to restrict the circumferential movement of the rotating sleeve 317.

[0080] The push rod rotating shaft 316 is rotatably mounted on the ejector bearing bracket 314, and one end of the push rod rotating shaft 316 extends into the slot 320 of the ejector bearing bracket. The push rod transmission gear 315 is mounted on the push rod rotating shaft 316 inside the slot 320, and the push rod transmission gear 315 meshes with the ejector gear 304 at the slot 320.

[0081] When the push rod drive gear 315 rotates under the drive of the ejector gear 304, it drives the push rod rotating shaft 316 to rotate. The rotation of the push rod rotating shaft 316 causes the sliding key 318 to move along the double helical groove 322, thereby driving the rotating sleeve 317 to move axially and realize the telescopic ejection movement.

[0082] The workflow of the secondary ejection mechanism is as follows:

[0083] Step 1: When performing the first-stage ejection and retraction action, the first servo motor 101 drives the ball screw pair 107 to rotate through the first driving pulley 108, the first driven pulley 109 and the first synchronous belt 105. The screw 112 in the ball screw pair 107 rotates, and the ball nut 113 drives the ejection plate 301 and the fixed ejection rod 302 and the telescopic ejection rod 305 on the ejection plate 301 to move, thereby realizing the first-stage ejection and retraction action.

[0084] Step 2: After the first-stage ejection action or before the first-stage retraction action, the second servo motor 201 moves via the second drive pulley 204 and the second synchronous belt 207, thereby driving the second driven pulley 206 to move. The second driven pulley 206 drives the synchronous transmission shaft 205 to rotate, and the rotation of the synchronous transmission shaft 205 drives the third drive pulley 214 on it to rotate. The third synchronous belt 215 drives the third driven pulley 213 to rotate, which in turn drives the ejection gear 304 to rotate. The ejection gear 304 drives the ejector transmission gear 315 on the telescopic ejector rod 305 to rotate, which in turn causes the ejector rod rotation shaft 316 to rotate. The rotating sleeve 317 moves axially under the restriction of the sliding key 318, realizing the second-stage ejection and retraction action.

[0085] Specifically, the ejection and retraction workflow of this secondary ejection mechanism is as follows:

[0086] Step 1: Perform the first-level ejection action. The first servo motor 101 drives the ball screw pair 107 to rotate through the first drive pulley, the first driven pulley and the first synchronous belt 105. The screw 112 in the ball screw pair rotates, and the ball nut 113 drives the ejection plate 301 and the fixed ejection rod 302 and the telescopic ejection rod 305 on the ejection plate 301 to move towards the closing template 41 to realize the first-level ejection action.

[0087] Step 2: After the first-stage ejection action, the second-stage ejection action is performed. The second servo motor 201 moves via the second drive pulley 204 and the second synchronous belt 207, thereby driving the second driven pulley 206. The second driven pulley 206 drives the synchronous transmission shaft 205 to rotate. The rotation of the synchronous transmission shaft 205 drives the third drive pulley 214 on it to rotate. The third synchronous belt 215 drives the third driven pulley 213 to rotate, which in turn drives the ejection gear 304 to rotate. The ejection gear 304 drives the ejector transmission gear 315 on the telescopic ejector rod 305 to rotate, which in turn causes the ejector rotation shaft 316 to rotate. Under the restriction of the sliding key 318, the rotating sleeve 317 moves axially towards the closing template 41, realizing the second-stage ejection action.

[0088] Step 3: Perform the secondary ejection action. The second servo motor 201 moves via the second drive pulley 204 and the second synchronous belt 207, thereby driving the second driven pulley 206. The second driven pulley 206 drives the synchronous transmission shaft 205 to rotate. The rotation of the synchronous transmission shaft 205 drives the third drive pulley 214 on it to rotate. The third synchronous belt 215 drives the third driven pulley 213 to rotate, which in turn drives the ejector gear 304 to rotate. The ejector gear 304 drives the ejector transmission gear 315 on the telescopic ejector rod 305 to rotate, which in turn causes the ejector rod rotation shaft 316 to rotate. Under the restriction of the sliding key 318, the rotating sleeve 317 moves axially away from the mating plate 41, realizing the secondary ejection action.

[0089] Step 4: Perform the first-level push-back action. The first servo motor 101 drives the ball screw pair 107 to rotate through the first drive pulley, the first driven pulley and the first synchronous belt 105. The screw 112 in the ball screw pair rotates, and the ball nut 113 drives the ejector plate 301 and the fixed ejector rod 302 and the telescopic ejector rod 305 on the ejector plate 301 to move away from the closing template 41 to realize the first-level push-back action, thereby completing a complete push-back operation.

[0090] Example 2:

[0091] In Figure 16, Figure 14 In the illustrated embodiment, a two-stage ejection mechanism is provided on the moving template 4, specifically including a primary drive device 1, a secondary drive device 2, and a telescopic ejection device 3. Its technical solution is basically the same as that of Embodiment 1, except for the secondary drive device 2.

[0092] The secondary drive device 2 includes a second servo motor 201 and a secondary transmission mechanism 202.

[0093] The secondary transmission mechanism 202 includes a second driving pulley 204 slidably disposed on the output shaft of the second servo motor 201, a second driven pulley 206 disposed on the telescopic ejector device 3, and a second synchronous belt 207 wound around the second driving pulley 204 and the second driven pulley 206.

[0094] The second servo motor 201 is mounted on the other side of the moving template 4 via a second motor bracket 208 and a second motor mounting plate 209. The second motor mounting plate 209 has a movable and adjustable structure. An adjustment groove 210 is provided on the second motor mounting plate 209, with its length direction horizontal. An adjustment bolt is provided inside the adjustment groove. The position of the second motor mounting plate is adjusted by adjusting the bolt, thereby adjusting the tension of the second synchronous belt 207.

[0095] like Figure 18As shown, the second driving pulley 204 is mounted on the motor output shaft via a sliding key 216. The second driving pulley 204 is connected to the ejector plate 301 via a connecting bracket 217. When the ejector plate 301 performs a first-stage ejection and retraction action, the second driving pulley 204 can follow the motor output shaft to move axially, maintaining consistency with the second driven pulley 206 in axial position.

[0096] The ejector gear 304 is disposed on the inner side of the ejector plate 301 facing the assembly plate 41. The gear drive shaft 309 is rotatably disposed inside the ejector gear mounting hole 308 via a bearing, and a second driven pulley 206 is mounted on the gear drive shaft 309. The ejector gear 304 can transmit the power of the third driven pulley 213 to the telescopic ejector rod 305.

[0097] When the push rod drive gear 315 rotates under the drive of the ejector gear 304, it drives the push rod rotating shaft 316 to rotate. The rotation of the push rod rotating shaft 316 causes the sliding key 318 to move along the double helical groove 322, thereby driving the rotating sleeve 317 to move axially and realize the telescopic ejection movement.

[0098] The workflow of the secondary ejection mechanism is as follows:

[0099] Step 1: When performing the first-stage ejection and retraction action, the first servo motor 101 drives the ball screw pair 107 to rotate through the first driving pulley 108, the first driven pulley 109 and the first synchronous belt 105. The screw 112 in the ball screw pair 107 rotates, and the ball nut 113 drives the ejection plate 301 and the fixed ejection rod 302 and the telescopic ejection rod 305 on the ejection plate 301 to move, thereby realizing the first-stage ejection and retraction action.

[0100] Step 2: After the first-stage ejection action or before the first-stage retraction action, the second servo motor 201 moves via the second driving pulley 204 and the second synchronous belt 207, thereby driving the second driven pulley 206 to rotate, which in turn drives the ejection gear 304 to rotate. The ejection gear 304 drives the ejector transmission gear 315 on the telescopic ejector rod 305 to rotate, thereby causing the ejector rod rotation shaft 316 to rotate. Under the restriction of the sliding key 318, the rotating sleeve 317 moves axially, realizing the second-stage ejection and retraction action.

[0101] Specifically, the ejection and retraction workflow of this secondary ejection mechanism is as follows:

[0102] Step 1: Perform the first-level ejection action. The first servo motor 101 drives the ball screw pair 107 to rotate through the first drive pulley, the first driven pulley and the first synchronous belt 105. The screw 112 in the ball screw pair rotates, and the ball nut 113 drives the ejection plate 301 and the fixed ejection rod 302 and the telescopic ejection rod 305 on the ejection plate 301 to move towards the closing template 41 to realize the first-level ejection action.

[0103] Step 2: After the first-stage ejection action, the second-stage ejection action is performed. The second servo motor 201 moves through the second driving pulley 204 and the second synchronous belt 207, thereby driving the second driven pulley 206 to rotate, which in turn drives the ejection gear 304 to rotate. The ejection gear 304 drives the ejector transmission gear 315 on the telescopic ejector rod 305 to rotate, which in turn causes the ejector rod rotation shaft 316 to rotate. Under the restriction of the sliding key 318, the rotating sleeve 317 moves axially towards the closing template 41, realizing the second-stage ejection action.

[0104] Step 3: Perform the secondary ejection action. The second servo motor 201 moves via the second driving pulley 204 and the second synchronous belt 207, thereby driving the second driven pulley 206 to rotate, which in turn drives the ejector gear 304 to rotate. The ejector gear 304 drives the ejector transmission gear 315 on the telescopic ejector rod 305 to rotate, which in turn causes the ejector rod rotation shaft 316 to rotate. Under the restriction of the sliding key 318, the rotating sleeve 317 moves axially away from the closing plate 41, realizing the secondary ejection action.

[0105] Step 4: Perform the first-level push-back action. The first servo motor 101 drives the ball screw pair 107 to rotate through the first drive pulley, the first driven pulley and the first synchronous belt 105. The screw 112 in the ball screw pair rotates, and the ball nut 113 drives the ejector plate 301 and the fixed ejector rod 302 and the telescopic ejector rod 305 on the ejector plate 301 to move away from the closing template 41 to realize the first-level push-back action, thereby completing a complete push-back operation.

[0106] Example 3:

[0107] In this embodiment, a two-stage ejection mechanism is provided, which is mounted on the moving template 4. Specifically, it includes a primary drive device 1, a secondary drive device 2, and a telescopic ejection device 3. Its technical solution is basically the same as that of Embodiment 1, except that:

[0108] The movable template 4 includes a separate composite template 41 and an mounting body 42.

[0109] Example 4:

[0110] In this embodiment, a two-stage ejection mechanism is provided on the moving template 4, specifically including a primary drive device 1, a secondary drive device 2, and a telescopic ejection device 3. Its technical solution is basically the same as that of Embodiment 1, except that the primary drive device 1 is located on the right side of the moving template, and the secondary drive device 2 is located on the left side of the moving template.

[0111] Example 5:

[0112] In this embodiment, a two-stage ejection mechanism is provided on the moving template 4, specifically including a primary drive device 1, a secondary drive device 2, and a telescopic ejection device 3. Its technical solution is basically the same as that of Embodiment 1, except that the primary drive device 1 is located at the upper or lower part of the moving template, and the secondary drive device 2 is located at the lower or upper part of the moving template.

[0113] The two-stage ejection mechanism described in the above embodiments can effectively increase the ejection stroke of the injection molding machine based on the original clamping force, thereby solving the problem of insufficient ejection stroke in small and medium-sized electric toggle-type injection molding machines. Furthermore, the ejection stroke can be controlled according to the needs of the ejected part, realizing a large-stroke, adjustable-stroke ejection and retraction setting, greatly improving work efficiency. The equipment has good versatility, and this two-stage ejection mechanism has good linkage performance, stable operation, good ejection effect, and is convenient and quick to operate.

[0114] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. For those skilled in the art, any improvements and substitutions that do not depart from the principles and spirit of the present invention should be within the protection scope of the present invention.

Claims

1. A two-stage ejection mechanism, characterized in that: It includes a primary drive device (1), a secondary drive device (2), and a telescopic ejection device (3) set on the moving template (4). The telescopic ejection device (3) is provided with an ejection plate (301), a fixed ejection rod (302) vertically set on the ejection plate (301), and a telescopic ejection rod (305) for adjusting the ejection and retraction stroke. The ejection plate (301) is driven by the primary drive device (1) to perform ejection and retraction actions along the axial direction of the fixed ejection rod (302). The ejection plate (301) drives the secondary drive device (2) to perform synchronous axial movement. The telescopic ejection rod (305) is driven by the secondary drive device (2) to perform secondary ejection and retraction actions. The telescopic ejector rod includes a slotted ejector bearing bracket fixedly connected to the ejector plate, an ejector rod rotating shaft rotatably mounted on the ejector bearing bracket, and a rotating sleeve sleeved on the ejector rod rotating shaft and extending and retracting axially. A push rod drive gear is provided on the push rod rotating shaft; an ejector gear is provided on the ejector plate to drive the push rod drive gear to rotate, and the ejector gear is connected to the secondary drive device through the gear drive shaft and driven to rotate by the secondary drive device. The push rod rotating shaft is a rotating shaft with a double helical groove. Two guide plates are symmetrically arranged on the push-out bearing bracket. The guide plates have a sliding groove, and a sliding key is slidably arranged inside the sliding groove. The rotating sleeve has a sliding key limiting hole. The sliding key passes through the sliding key limiting hole and fits with the double helical groove to limit the circumferential movement of the rotating sleeve.

2. The secondary ejection mechanism according to claim 1, characterized in that: The first-stage drive device (1) includes a first servo motor (101) and a first-stage transmission mechanism (100). The first-stage transmission mechanism (100) includes a ball screw pair (107). The ball nut (113) in the ball screw pair (107) is connected to the ejector plate (301) and drives the ejector plate to move axially. The first-stage transmission mechanism (100) adopts belt drive. The first servo motor (101) is provided with a first driving pulley (108). The ball screw pair (107) is provided with a first driven pulley (109). The first driving pulley (108) and the first driven pulley (109) are wound with a first synchronous belt (105).

3. The secondary ejection mechanism according to claim 1, characterized in that: The push rod drive gear (315) is mounted on the push rod rotating shaft (316) facing the slot (320).

4. The secondary ejection mechanism according to claim 1, characterized in that: The ejector bearing bracket (314) is also provided with a rotating sleeve limiting device (5), which includes two guide plates (319) arranged symmetrically.

5. The secondary ejection mechanism according to any one of claims 1 to 4, characterized in that: The secondary drive device (2) includes a second servo motor (201), a secondary transmission mechanism (202) and a tertiary transmission mechanism (203). The secondary transmission mechanism (202) and the tertiary transmission mechanism (203) are belt drives respectively. The tertiary transmission mechanism (203) and the ejector plate (301) are axially synchronized through a synchronization mechanism.

6. The secondary ejection mechanism according to claim 5, characterized in that: The secondary transmission mechanism (202) includes a second driving pulley (204) disposed on the output shaft of the second servo motor (201), a synchronous transmission shaft (205) disposed on the moving template (4), a second driven pulley (206) disposed on the synchronous transmission shaft (205), and a second synchronous belt (207) wound around the second driving pulley (204) and the second driven pulley (206).

7. The secondary ejection mechanism according to claim 5, characterized in that: The three-stage transmission mechanism (203) includes a third driving pulley (214) slidably mounted on a synchronous transmission shaft (205), a third driven pulley (213) mounted on a telescopic ejector device (3), and a third synchronous belt (215) wound around the third driving pulley (214) and the third driven pulley (213); the synchronous mechanism includes a connecting bracket (217) connecting the third driving pulley (214) and the ejector plate (301).

8. The secondary ejection mechanism according to any one of claims 1 to 4, characterized in that: The secondary drive device (2) includes a second servo motor (201) and a secondary transmission mechanism (202); the secondary transmission mechanism (202) includes a second driving pulley (204) slidably disposed on the output shaft of the second servo motor (201), a second driven pulley (206) disposed on the telescopic ejector device (3), and a second synchronous belt (207) wound around the second driving pulley (204) and the second driven pulley (206); the second driving pulley (204) and the ejector plate (301) are axially synchronized through a connecting bracket (217).

9. A method for ejecting and retracting a two-stage ejection mechanism as described in any one of claims 1 to 8, characterized in that... Includes the following steps: Step 1: When performing the first-level ejection and ejection action, the first servo motor (101) drives the ball screw pair (107) to rotate through the first driving pulley (108), the first driven pulley (109) and the first synchronous belt (105). The screw (112) in the ball screw pair (107) rotates, and the ball nut (113) drives the ejector plate (301) and the fixed ejector rod (302) and the telescopic ejector rod (305) on the ejector plate (301) to move to realize the first-level ejection and ejection action. Step 2: After the first-level ejection action or before the first-level retraction action, the second servo motor (201) drives the ejection gear (304) to rotate through the second-level transmission mechanism (202) and the third-level transmission mechanism (203), or through the second-level transmission mechanism (202). The ejection gear (304) drives the push rod transmission gear (315) on the telescopic ejection rod (305) to rotate, thereby causing the push rod rotation shaft (316) to rotate. The rotating sleeve (317) moves axially under the restriction of the sliding key (318) to realize the second-level ejection and retraction action.

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