Servo motor rack lock device

Abstract

This utility model belongs to the technical field of injection molding machine mold clamping devices, and particularly relates to a servo motor rack and pinion mold clamping device, including a bracket; a lower mold plate is provided on the bracket, a rotating disk is provided on the lower mold plate, and multiple openings are provided on the lower mold plate. Each opening has a corresponding mold clamping column, one end of each mold clamping column is connected to an upper mold plate, and the other end is connected to a base. The base is located at the bottom of the bracket, and two symmetrically arranged driving devices are provided on the base. Each driving device includes a servo motor and a rack; the rack is fixed to the bottom of the lower mold plate. By setting the servo motor and rack to mesh and move, the traditional large-diameter hydraulic cylinder direct drive is replaced. The servo motor can be set horizontally, which can reduce the height of the table and facilitate user operation. At the same time, the servo motor has high-precision force sensing capability and will monitor the change of motor output torque. When driving the upper mold plate to press down, if it encounters an improperly placed workpiece, it will automatically spring away, preventing damage to the mold and reducing economic losses.

Description

Technical Field

[0001] This utility model belongs to the technical field of injection molding machine mold locking devices, and particularly relates to a servo motor rack and pinion mold locking device. Background Technology

[0002] Currently, in the production operation of injection molding machines and one-step blow molding machines, the mold closing, locking and opening are carried out in a cycle. The hydraulic cylinder piston rod extends to complete the mold closing, high pressure is injected into the large cavity of the hydraulic cylinder to complete the mold locking, and the hydraulic cylinder piston rod retracts to complete the mold opening. The number of mold cavities and the product diameter need to be matched with the corresponding locking force. Under the same pressure, a larger locking force requires a larger cylinder diameter hydraulic cylinder.

[0003] Existing mold-locking devices use a direct-drive method with large-diameter hydraulic cylinders: the piston rod of the large-diameter hydraulic cylinder extends and retracts to close and open the mold, and high-pressure hydraulic oil is injected into the large chamber of the cylinder to lock the mold. When a large clamping force is required, a large-diameter hydraulic cylinder is needed. The high-speed extension and retraction of the piston rod of the large-diameter hydraulic cylinder requires a large flow rate, which requires a larger power unit, such as a large-displacement main pump and a high-power motor, resulting in high energy consumption, slow production speed, and low output. Because the large-diameter hydraulic cylinder is large, the foot pads are high and the worktable is high, which is very inconvenient. At the same time, if the workpiece is not placed properly, it will be crushed during injection molding, damaging the mold and causing economic losses. Utility Model Content

[0004] The purpose of this utility model is to provide a servo motor rack and pinion mold locking device, which aims to solve the technical problems of existing mold locking devices having high energy consumption, slow production speed, and low output; large-diameter hydraulic cylinders have a large volume, resulting in high foot height and a high worktable, which is very inconvenient; at the same time, if the workpiece is not placed properly, it will be crushed during injection molding, damaging the mold and causing economic losses.

[0005] To achieve the above objectives, this utility model provides a servo motor rack and pinion mold locking device, comprising a support; a lower template is provided on the support, a rotating disk is provided on the lower template, a plurality of workstations are provided on the rotating disk, an injection mold is provided on each workstation, a plurality of openings are provided on the lower template, a mold clamping column is correspondingly inserted through each opening, an upper template is connected to one end of each mold clamping column, and a base is connected to the other end of each mold clamping column, the base is located at the bottom of the support, and two symmetrically arranged driving devices are provided on the base, the driving devices can drive the upper template to move up and down through the mold clamping column, each driving device includes a servo motor and a rack; the rack is fixed to the bottom of the lower template, and the servo motor moves by meshing with the rack through an output gear.

[0006] Optionally, a speed reducer is provided between the servo motor and the rack, the speed reducer being used to reduce the rotational speed and increase the torque.

[0007] Optionally, the base is provided with a rack hole, one end of the rack is fixedly connected to the lower template, and the other end passes through the rack hole. The reducer includes a gear set. The output gear is meshed with the gear set, and the gear set is meshed with the rack. The servo motor can drive the upper template to close and open the mold by meshing with the rack.

[0008] Optionally, the gear set includes a drive gear; two clearance positions are symmetrically provided on the base, each clearance position is connected to the corresponding rack hole, and the drive gear is disposed in the clearance position to mesh with the rack.

[0009] Optionally, the lower template is further provided with a rotating assembly, which includes a rotating motor; the lower template is provided with a rotating hole, the output shaft of the rotating motor passes through the rotating hole, the output shaft of the rotating motor is provided with a rotating gear, and a ring of locking teeth is provided around the edge of the rotating disk, the locking teeth engaging with the rotating gear, and the rotating motor can drive the rotating disk to rotate.

[0010] Optionally, each of the servo motors is horizontally mounted on the base.

[0011] Optionally, the bottom of the lower template is further provided with an ejector pin assembly, which can assist the molded workpiece in being ejected from the mold.

[0012] Optionally, the base is also provided with a brake device, which is used to prevent the upper template from retracting or loosening, and to ensure that the upper template remains stably closed during high-pressure injection.

[0013] Furthermore, the bottom of the brake device is also equipped with a pressure-boosting anti-expansion device, which is used to prevent the mold from expanding.

[0014] Compared with the prior art, the above-mentioned technical solutions of the servo motor rack and pinion locking device provided in this utility model embodiment have at least one of the following technical effects:

[0015] By using a servo motor and rack and pinion mechanism for movement instead of the traditional direct drive of a large-diameter hydraulic cylinder, the servo motor can be positioned laterally, reducing the table height and making it easier for users to operate. At the same time, the servo motor has high-precision force sensing capabilities, which monitors changes in the motor's output torque. When the upper template is pressed down, it will automatically spring away if it encounters an improperly placed workpiece, preventing damage to the mold and reducing economic losses. Compared to a large-diameter hydraulic cylinder, production driven by a servo motor is faster and has higher capacity. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 This is a partial structural schematic diagram of the present invention.

[0019] Figure 3 This is a schematic diagram of another part of the structure of this utility model.

[0020] Figure 4 This is a partial structural schematic diagram of the present invention.

[0021] Figure 5 This is a schematic diagram of the brake device and the pressure-boosting anti-expansion device of this utility model.

[0022] Figure 6 for Figure 5 A schematic diagram of the cross-sectional structure.

[0023] The following are the labeling elements in the figure:

[0024] 100. Support; 110. Lower template; 111. Opening; 112. Rotating hole; 120. Rotating disk; 121. Station; 122. Snap-fit ​​teeth; 130. Mold closing pillar; 140. Upper template; 150. Base; 151. Rack hole; 153. Hydraulic cylinder hole; 154. Mold pillar hole; 155. Clearance space;

[0025] 210 Servo motor; 211 Output gear; 220 Rack; 230 Reducer; 231 Gear set; 232 Drive gear;

[0026] 310, guide post; 311, first thread; 320, brake assembly; 321, brake component; 3211, first brake block; 3212, second brake block; 322, drive assembly; 323, second thread;

[0027] 410. Hydraulic cylinder; 411. Output shaft; 420. Guide column channel;

[0028] 500. Ejector pin assembly;

[0029] 610. Rotate the motor; 620. Rotate the gear. Detailed Implementation

[0030] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0031] In the description of the embodiments of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0034] In one embodiment of this utility model, according to Figure 1-6As shown, the system includes a support 100; a lower template 110 is mounted on the support 100; a rotating disk 120 is mounted on the lower template 110; several workstations 121 are mounted on the rotating disk 120; each workstation 121 has an injection mold; the lower template 110 has multiple openings 111; a mold clamping post 130 passes through each opening 111; one end of each mold clamping post 130 is connected to an upper template 140, and the other end is connected to a base 150; the base 150 is located at the bottom of the support 100; two symmetrically arranged driving devices are mounted on the base 150. The upper mold plate 140 can be moved up and down by the clamping column 130. Each driving device includes a servo motor 210 and a rack 220. The rack 220 is fixed to the bottom of the lower mold plate 110. The servo motor 210 moves by meshing with the rack 220 through the output gear 211. The base 150 is also equipped with a brake device to prevent the upper mold plate 140 from moving backward or loosening, ensuring that the upper mold plate 140 remains stably closed during high-pressure injection. The bottom of the brake device is also equipped with a pressure boosting and anti-expansion device to prevent the mold from expanding. Each servo motor 210 is horizontally mounted on the base 150.

[0035] Specifically, the traditional large-diameter hydraulic cylinder is replaced by a servo motor 210 and a rack 220 engaging and moving together. The servo motor 210 can be set horizontally, which can reduce the height of the table and make it easier for users to operate. At the same time, the servo motor 210 has high-precision force sensing capabilities and will monitor changes in the motor output torque. When the upper template 140 is pressed down, it will automatically spring away if it encounters an improperly placed workpiece, so as not to damage the mold and reduce economic losses. Compared with the large-diameter hydraulic cylinder, production driven by the servo motor 210 is faster and has higher production capacity.

[0036] It's understandable. The servo motor 210 can be set horizontally or vertically. Setting it horizontally can reduce the overall height of the table, and power can be transmitted simply through the transmission components.

[0037] Furthermore, the base 150 is also provided with several mold post holes 154, each mold post hole 154 for inserting the mold closing post 130. The base 150 has a triangular symmetrical shape, with three mold post holes 154 located at the three ends of the base 150. Specifically, a triangle is one of the most stable geometric structures, and the three mold post holes 154 distributed at the ends form a uniform force-bearing support surface, making the injection molding machine more stable during operation. Furthermore, the triangular design is more compact than the traditional rectangular layout, reducing the floor space occupied by the base 150.

[0038] Understandably, each mold column 130 is fixedly connected to the base 150 and the upper template 140.

[0039] In another embodiment of this utility model, according to Figure 4-6 As shown, a reducer 230 is also provided between the servo motor 210 and the rack 220. The reducer 230 is used to reduce the speed and increase the torque. The base 150 is provided with a rack hole 151. One end of the rack 220 is fixedly connected to the lower template 110, and the other end passes through the rack hole 151. The reducer 230 includes a gear set 231. The output gear 211 is meshed with the gear set 231, and the gear set 231 is meshed with the rack 220. The servo motor 210 can drive the upper template 140 to close and open the mold through meshing with the rack 220. The gear set 231 includes a drive gear 232. Two clearance positions 155 are symmetrically provided on the base 150. Each clearance position 155 is connected to the corresponding rack hole 151. The drive gear 232 is located in the clearance position 155 and meshes with the rack 220.

[0040] Specifically, the purpose of the reducer 230 is to reduce the speed of the servo motor 210 and increase the torque. The base 150 is specially designed according to the rack 220 and the reducer 230. The drive gear 232 of the reducer 230 is located in the clearance 155 and meshes with the rack 220. The clearance 155 and the rack hole 151 are integrated into one design, which reduces the volume of the external gear set 231 and makes the overall structure more compact.

[0041] In another embodiment of this utility model, according to Figure 4-6 As shown, the brake device includes a guide post 310; one end of the guide post 310 is fixedly connected to the lower template 110, and the other end passes through the base 150. A brake assembly is provided on the guide post 310, and a first thread 311 is provided on the guide post 310. The brake assembly includes a brake component 320; a brake assembly 321 and a drive assembly 322; a second thread 323 is provided on the brake component 320; and the drive assembly 322 can drive the brake component 320; the brake assembly 321 to approach the guide post 310 so that the first thread 311 and the second thread 323 cooperate with each other to achieve the locking of the brake. Brake component 320; brake assembly; 321 includes a first brake block 3211 and a second brake block 3212; when the first brake block 3211 and the second brake block 3212 are close together, a brake position is formed inside, and a second thread 323 is provided on the brake position. The drive assembly 322 can drive the first brake block 3211 and the second brake block 3212 to move closer to each other and engage with the guide post 310 to engage the brake, and to move away from each other to disengage the brake.

[0042] Specifically, the drive assembly 322 can be a conventional cylinder, with one conventional cylinder mounted on each of the first brake block 3211 and the second brake block 3212, driving the first brake block 3211 and the second brake block 3212 to move closer or further apart. Alternatively, the drive assembly 322 can be a connecting claw cylinder, with each connecting claw connecting to the first brake block 3211 and the second brake block 3212 to move closer or further apart. The drive assembly 322 can also be a cylinder with a guide rod, the guide rod passing sequentially through the second brake block 3212 and connecting to the first brake block 3211, driving the first brake block 3211 and the second brake block 3212 to move closer or further apart. Other connection methods, such as electric pneumatic rods and lead screw linear modules, are also possible, all within the scope of protection of this utility model patent.

[0043] In another embodiment of this utility model, according to Figure 4-6 As shown, the pressure-boosting anti-expansion device includes a hydraulic cylinder 410. After the brake is engaged, the output shaft 411 of the hydraulic cylinder 410 can extend and press against the brake device, causing the upper template 140 to press tightly against the mold and prevent the mold from expanding. The hydraulic cylinder 410 is integrated with the base 150 to reduce the height of the pressure-boosting anti-expansion device. The base 150 is provided with a placement groove, and the bottom of the placement groove is provided with a cylinder hole 153. The hydraulic cylinder 410 is placed in the placement groove, and the bottom of the hydraulic cylinder 410 passes through the cylinder hole 153. The hydraulic cylinder 410 has a through guide column channel 420 in the middle. One end of the guide column 310 is fixedly connected to the lower template 110, and the other end passes through the guide column channel 420.

[0044] Specifically, the integrated design of hydraulic cylinder 410 and base 150 can further reduce the height of the workbench, making it easier for users to install molds. Existing high-workbench injection molding machines require ladders to be set up for users to climb up and down to install molds, which is very inconvenient and wastes manpower.

[0045] Furthermore, when the drive device drives the upper template 140 to just touch or be a few millimeters away from the injection mold, the brake device engages and locks. The output shaft 411 of the hydraulic cylinder 410 can extend and press against the brake device. At this time, the brake device is fixed. When the output shaft 411 of the hydraulic cylinder 410 presses against the mold, there is an upward force. The forces are mutual. Because the mold closing column 130 can move up and down, it can drive the upper template 140 to press against the injection mold, thereby preventing the mold from expanding and producing burrs on the plastic material.

[0046] In another embodiment of this utility model, such as Figure 1-3As shown, the lower template 110 is also equipped with a rotating assembly, which includes a rotating motor 610. The lower template 110 has a rotating hole 112, through which the output shaft 411 of the rotating motor 610 passes. A rotating gear 620 is mounted on the output shaft 411 of the rotating motor 610. A ring of engaging teeth 122 is arranged around the edge of the rotating disk 120, and the engaging teeth 122 engage with the rotating gear 620. The rotating motor 610 can drive the rotating disk 120 to rotate. Specifically, the rotating assembly can be used to set up multiple workstations 121 for production. When one workstation 121 is injection molding, another workstation 121 ejects the workpiece and places the next workpiece. After injection molding is completed, the rotation cycle is performed, which speeds up the processing and production efficiency.

[0047] In another embodiment of this utility model, such as Figure 1-3 As shown, the bottom of the lower mold plate 110 is also provided with an ejector pin assembly 500, which can assist the molded workpiece in being ejected from the mold. Specifically, when the rotating disk 120 rotates the freshly injection mold to the ejector pin assembly 500, the ejector pin assembly 500 can assist the molded workpiece in being ejected from the mold, increasing production efficiency.

[0048] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of this utility model. It should not be construed that the specific implementation of this utility model is limited to these descriptions. For those skilled in the art, the architectural form of this utility model can be flexibly varied without departing from its concept, and a series of products can be derived. Any simple deductions or substitutions should be considered as falling within the patent protection scope defined by the submitted claims.

Claims

1. A servo motor rack and pinion locking device, characterized in that, The system includes a support frame; a lower template is mounted on the support frame, a rotating disk is mounted on the lower template, and several workstations are mounted on the rotating disk. Each workstation has an injection mold. The lower template has multiple openings, and a mold-closing column is inserted through each opening. One end of each mold-closing column is connected to an upper template, and the other end is connected to a base. The base is located at the bottom of the support frame, and two symmetrically arranged driving devices are mounted on the base. The driving devices can drive the upper template to move up and down through the mold-closing column. Each driving device includes a servo motor and a rack. The rack is fixed to the bottom of the lower template, and the servo motor moves by meshing with the rack through an output gear.

2. The servo motor rack and pinion locking device according to claim 1, characterized in that, A speed reducer is also provided between the servo motor and the rack, which is used to reduce the speed and increase the torque.

3. The servo motor rack and pinion locking device according to claim 2, characterized in that, The base is provided with a rack hole. One end of the rack is fixedly connected to the lower template, and the other end passes through the rack hole. The reducer includes a gear set. The output gear meshes with the gear set, and the gear set meshes with the rack. The servo motor can drive the upper template to close and open the mold by meshing with the rack.

4. The servo motor rack and pinion locking device according to claim 3, characterized in that, The gear set includes a drive gear; two clearance positions are symmetrically provided on the base, each clearance position is connected to the corresponding rack hole, and the drive gear is located in the clearance position to mesh with the rack.

5. The servo motor rack and pinion locking device according to claim 1, characterized in that, The lower template is also provided with a rotating assembly, which includes a rotating motor; the lower template is provided with a rotating hole, the output shaft of the rotating motor passes through the rotating hole, the output shaft of the rotating motor is provided with a rotating gear, and a ring of locking teeth is provided around the edge of the rotating disk, the locking teeth engaging with the rotating gear, and the rotating motor can drive the rotating disk to rotate.

6. The servo motor rack and pinion locking device according to claim 2, characterized in that, Each of the servo motors is horizontally mounted on the base.

7. The servo motor rack and pinion locking device according to claim 1, characterized in that, The bottom of the lower template is also provided with an ejector pin assembly, which can assist the molded workpiece in being ejected from the mold.

8. The servo motor rack and pinion locking device according to claim 6, characterized in that, The base is also equipped with a brake device, which is used to prevent the upper template from moving backward or loosening, and to ensure that the upper template remains stably closed during high-pressure injection.

9. The servo motor rack and pinion locking device according to claim 8, characterized in that, The bottom of the brake device is also equipped with a pressure boosting and anti-expansion device, which is used to prevent the mold from expanding.

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