Mechanical slide slider lock structure for double-color mold and control method

Abstract

The invention discloses a mechanical slide slider lock structure for a double-color mold and a control method, which are applied to the technical field of double-color molds, and the key points of the technical scheme are as follows: the mechanical slide slider lock structure comprises a slide, a stop block assembly, a warping plate assembly, a lock cylinder assembly, a slide shovel assembly and an elastic block; the stop block assembly comprises a first stop block and a second stop block which are arranged at an interval; the seesaw assembly comprises a first seesaw and a second seesaw, and the middle of the first seesaw and the middle of the second seesaw are hinged to a mold body of the double-color mold through hinge shafts; the lock cylinder assembly comprises a first lock cylinder and a second lock cylinder. The slide shoveling machine assembly comprises a first injection molding station slide shoveling machine and a second injection molding station slide shoveling machine; the first injection molding station slide shoveling machine comprises a first crimping section, a pushing section and a second crimping section which are connected in sequence; the second injection molding station slide shoveling machine comprises a crimping section and a hooking section and is positioned above the other side of the front end of the slide; the slide locking device has the technical effect that the locking effect of the slide is ensured.

Description

Technical Field

[0001] This invention relates to the field of two-color mold technology, and in particular to a mechanical sliding block lock structure and control method for two-color molds. Background Technology

[0002] In two-color molds, the slide is a key movable forming component within the mold. The precise control of its forward and backward movement directly affects the product forming quality and production stability. Currently, the industry mainly uses hydraulic cylinders to drive the slide's forward and backward movement, which is driven by changes in hydraulic pressure within the cylinder.

[0003] However, the existing hydraulic cylinder-driven sliding mechanism in two-color molds has significant drawbacks: the hydraulic cylinder is prone to pressure instability during operation, which directly causes the sliding mechanism to loosen and move backward during operation. This loosening and backward movement of the sliding mechanism damages the preset precision of the mold cavity, resulting in pressure marks on the surface of the molded product and increased gaps between mold components. This causes molten plastic to overflow during molding, forming burrs on the product. This not only reduces the product yield but also requires additional manpower and resources for subsequent trimming, increasing production costs. Therefore, it is necessary to improve the existing hydraulic cylinder-driven sliding mechanism to solve the problem of unstable sliding mechanism locking. Summary of the Invention

[0004] The primary objective of this invention is to provide a mechanical slide block lock structure for two-color molds, which has the advantage of ensuring the locking effect of the slide.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a mechanical sliding block lock structure for a two-color mold, comprising a sliding block, a stop block assembly, a rocker assembly, a lock core assembly, a sliding block shovel assembly, and a spring block; The stop assembly includes a first stop and a second stop arranged at intervals. The first stop is located below the front end of the slide's movement path, and its upper end face is provided with a limiting groove adapted to the lock core assembly, which is used to limit the slide's backward movement when the mold is open. The second stop is located at the rear end of the slide's movement path, and its front end face is flat and parallel to the rear end face of the slide, which is used to limit the slide's backward movement after the mold is opened at the second injection station. The rocker assembly includes a first rocker and a second rocker. The middle parts of the first rocker and the second rocker are hinged to the mold body of the two-color mold through a hinge shaft. One end of the rocker is the force-bearing end that cooperates with the sliding shovel assembly, and the other end is the driving end that abuts against the lock cylinder assembly. The whole rocker is located above the sliding position and corresponds one-to-one with the lock cylinder assembly. The lock cylinder assembly includes a first lock cylinder and a second lock cylinder, both of which are columnar structures. The lower end of the first lock cylinder is provided with a protrusion adapted to the limiting groove, and the lower end of the second lock cylinder is provided with a flat pressing part. The slide is provided with a first sliding hole adapted to the first lock cylinder and a second sliding hole adapted to the second lock cylinder. Both sliding holes penetrate the upper and lower surfaces of the slide in a vertical direction. The first lock cylinder and the second lock cylinder are slidably assembled in the corresponding sliding holes. Their upper ends abut against the driving end of the rocker assembly, and their lower ends can extend out of the bottom of the slide. The sliding shovel assembly includes a first injection molding station sliding shovel and a second injection molding station sliding shovel. The first injection molding station sliding shovel includes a first pressing section, a pushing section, and a second pressing section connected in sequence. The whole assembly is located above the front end of the sliding position, and its movement path covers the force-bearing end of the first rocker, the front end face of the sliding position, and the planar pressing part of the second lock core. The second injection molding station sliding shovel includes a pressing section and a hooking section, located above the other side of the front end of the sliding position. Its movement path covers the force-bearing end of the second rocker and the spring block. The spring block is a block structure. Its front end is detachably connected to the rear end face of the slide by bolts. The rear end is provided with a hook groove that opens towards the slide shovel of the second injection molding station. The hook groove is adapted to the shape of the hook section of the slide shovel of the second injection molding station.

[0006] The present invention is further configured such that: the driving ends of the first rocker and the second rocker are provided with arc-shaped abutment surfaces, the arc-shaped abutment surfaces are in contact with the upper end surface of the corresponding lock cylinder, and when the rocker rotates around the hinge axis, the arc-shaped abutment surfaces can slide along the upper end surface of the lock cylinder to drive the lock cylinder to move vertically along the sliding hole.

[0007] The invention is further configured such that: the width of the hook groove of the spring block is greater than the thickness of the hook section of the second injection molding station slide shovel, and the bottom of the hook groove is provided with an arc-shaped transition surface; the end of the hook section of the second injection molding station slide shovel is provided with an arc-shaped head that matches the bottom of the hook groove.

[0008] The present invention is further configured such that: the lower ends of the first pressing section and the second pressing section of the first injection molding station slide shovel are both provided with inclined pressing surfaces, and the inclined pressing surfaces are inclined at the same angle as the upper surface of the corresponding rocker plate force-bearing end; the pushing section is a straight structure, parallel to and opposite to the front end face of the slide.

[0009] The present invention is further configured such that: the limiting groove of the first stop block is provided with a guide slope, the guide slope is adapted to the outer slope of the lower end protrusion of the first lock cylinder, and is used to guide the protrusion to slide into or out of the limiting groove; the side of the first stop block near the moving position retraction direction is provided with an arc-shaped guide surface, the curvature of the arc-shaped guide surface is consistent with the outer peripheral curvature of the first lock cylinder.

[0010] The second objective of this invention is to provide a mechanical slide lock control method for two-color molds, which has the advantage of ensuring the locking effect of the slides.

[0011] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a mechanical sliding block lock control method for a two-color mold, employing a mechanical sliding block lock structure for a two-color mold as described in any of the above technical solutions; comprising the following steps: S1: When the mold is in the open state, the slide remains in the retracted state, and the protrusion at the lower end of the first lock core is embedded in the limiting groove of the first stop block to restrict the movement of the slide; S2: Start the mold closing at the first injection station. The sliding shovel at the first injection station moves in the sliding direction. The inclined pressing surface of its first pressing section first contacts the force-bearing end of the first rocker, driving the first rocker to rotate around the hinge axis, causing the first lock core to move upward along the first sliding hole, and the protrusion completely disengages from the limiting groove. Then, the pushing section contacts the front end face of the slide, pushing the block to the mold closing position. Finally, the inclined pressing surface of the second pressing section contacts the flat pressing part of the second lock core, driving the second lock core to move downward along the second sliding hole to the locking position, realizing the locking of the slide. S3: After injection molding at the first injection station, the front mold opens. Because the second locking core keeps the slide locked, the mold rotates 180 degrees to switch to the second injection station. S4: Start the mold closing of the second injection station. The sliding shovel of the second injection station moves in the sliding direction. Its pressing section contacts the force-bearing end of the second rocker plate, driving the second rocker plate to rotate around the hinge axis, so that the second lock core moves upward along the second sliding hole and disengages from the locked position, thereby realizing the unlocking of the sliding position. S5: After the second injection molding station is completed, the mold opening of the second injection molding station is started. During the retraction process of the slide shovel of the second injection molding station, the arc-shaped head of its hooking section is embedded in the U-shaped hooking groove of the spring block. Stable hooking is achieved by the arc-shaped transition surface at the bottom of the hooking groove, which in turn drives the slide to retract synchronously. The first lock core moves with the slide, and its lower end protrusion slides along the arc-shaped guide surface of the first stop to the outside of the first stop until the rear end face of the slide is completely attached to the front end face of the second stop. The slide retracts into place, completing one two-color injection molding cycle.

[0012] The present invention is further configured such that: in step S2, when the first injection molding station slide shovel presses the first rocker plate, the first rocker plate rotates around the hinge axis at an angle of 15°-30° until the protrusion at the lower end of the first lock core is completely disengaged from the limiting groove of the first stop, and the guide protrusion of the first lock core moves along the guide keyway of the first sliding hole so that the first lock core only makes vertical displacement.

[0013] The present invention is further configured such that: in step S3, during the process of the mold rotating 180 degrees, the planar pressing part of the second lock core always maintains contact with the second pressing section of the first injection station slide shovel, the second lock core maintains the locking position along the guide keyway of the second sliding hole, and the displacement of the slide is ≤0.05mm.

[0014] The present invention is further configured such that: in step S5, when the moving part is retracted to the position, the axis of the first lock cylinder and the axis of the first stop are offset in the horizontal direction, and the offset distance is not less than the radius of the first lock cylinder; the front end face of the second stop is completely in contact with the rear end face of the moving part, and the contact area is not less than 90% of the area of ​​the rear end face of the moving part.

[0015] In summary, the present invention has the following beneficial effects: 1. When the first injection molding station closes the mold, the first injection molding station slide shovel first presses the first rocker plate downward with an inclined pressing surface, thereby driving the first locking core to move vertically upward along the guide keyway to unlock the slide. Then, the shovel pushing section directly contacts the front end face of the slide to push the slide to the mold closing position. Finally, the second stage of the shovel presses the second locking core vertically downward to lock it, preventing the slide from shifting back during the injection molding process. When the first injection molding station is completed and the front mold is opened, the flat pressing part of the second locking core is always pressed on the second pressing section of the shovel. With the guide keyway limiting the slide, the slide displacement is suppressed when the mold rotates 180° to switch stations. When the second injection molding station closes the mold, the slide shovel presses the second rocker plate to unlock the slide, so that the slide moves backward only after the second injection molding station is completed. Thus, the mechanical locking structure replaces the hydraulic drive during the mold closing process, preventing the slide from shifting back during the mold closing process. 2. In the initial mold opening state (S1), the protruding part at the lower end of the first lock core quickly embeds itself with the guide slope of the first stop limiting groove, forming an initial limit to prevent the slide from shifting due to mold vibration. In the first injection molding mold closing stage (S2), the slide shovel of the first injection station drives the first rocker to rotate precisely around the hinge axis through the inclined pressing surface, thereby driving the first lock core to move vertically upward along the sliding hole containing the guide keyway, ensuring that the protruding part is completely disengaged from the limiting groove. Subsequently, the pushing section pushes the slide smoothly by directly contacting the front end face of the slide. Finally, the second pressing section presses the second lock core vertically downward to the locking position. During mold rotation switching... At station (S3), the second lock core flat pressing part always keeps in contact with the first injection station slide shovel and is limited by the guide keyway, so as to avoid the slide displacement during rotation and damage to the molding accuracy. In the two-shot mold closing unlocking (S4) and mold opening retraction stage (S5), the pressing section of the second injection station slide shovel drives the second rocker to unlock. The arc head of the hooking section is guided by the arc transition surface of the U-shaped hooking groove of the spring block to achieve a smooth hooking and drive the slide to retract. At the same time, the first lock core slides to the outside along the arc guide surface of the first stop block. Finally, the second stop block and the rear end face of the slide block are attached to form a double limit. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this embodiment; Figure 2 yes Figure 1Enlarged schematic diagram of part A; Figure 3 yes Figure 1 Enlarged diagram of part B; Figure 4 This is a structural cross-sectional view of the first lock cylinder in this embodiment; Figure 5 This is a cross-sectional view of the second lock cylinder in this embodiment; Figure 6 This is a cross-sectional view of the spring block in this embodiment.

[0017] Reference numerals: 1. Slide; 2. Stop block assembly; 21. First stop block; 22. Second stop block; 23. Limiting groove; 24. Guide slope; 25. Arc-shaped guide surface; 3. Rocker assembly; 31. First rocker; 32. Second rocker; 33. Arc-shaped abutment surface; 4. Lock cylinder assembly; 41. First lock cylinder; 42. Second lock cylinder; 43. Protrusion; 44. Flat pressing part; 45. First sliding hole; 46. Second sliding hole; 5. Slide shovel assembly; 51. First injection molding station slide shovel; 511. First pressing section; 512. Pushing section; 513. Second pressing section; 514. Inclined pressing surface; 52. Second injection molding station slide shovel; 521. Pressing section; 522. Hook section; 6. Spring block; 61. Hook groove. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the accompanying drawings.

[0019] Example 1: refer to Figures 1 to 6 A mechanical sliding block lock structure for a two-color mold includes a slide 1, a stop block assembly 2, a rocker assembly 3, a lock core assembly 4, a slide shovel assembly 5, and a spring block 6. The stop assembly 2 includes a first stop 21 and a second stop 22 spaced apart. The first stop 21 is located below the front end of the moving path of the slide 1, and its upper surface is provided with a limiting groove 23 adapted to the lock cylinder assembly 4, which is used to limit the slide 1 from retracting when the mold is open. The second stop 22 is located at the end of the rear end of the moving path of the slide 1, and its front end is flat and parallel to the rear end end face of the slide 1, which is used to limit the retraction stroke of the slide 1 after the mold is opened at the second injection station. The limiting groove 23 of the first stop 21 can be precisely fitted with the protrusion 43 of the first lock cylinder 41 when the mold is open. The physical locking mechanism restricts the displacement of slide 1 to prevent slide 1 from shifting due to mold vibration. The second stop 22 achieves the final limit of slide 1's retraction through end face contact, ensuring that slide 1 retracts to the same position each time, providing a precision basis for the next injection cycle. At the same time, the guide slope 24 of the first stop 21 can guide the protrusion 43 of the first lock core 41 to smoothly insert into or disengage from the limiting groove 23, avoiding jamming. Its arc-shaped guide surface 25 can guide the first lock core 41 to smoothly slide to the outside of the stop when slide 1 retracts, preventing component damage caused by rigid collision and ensuring the smooth operation of the structure. The rocker assembly 3 includes a first rocker 31 and a second rocker 32. The middle parts of the first rocker 31 and the second rocker 32 are hinged to the mold body of the two-color mold via a hinge shaft. One end of the rocker is the force-bearing end that cooperates with the sliding shovel assembly 5, and the other end is the driving end that abuts against the lock cylinder assembly 4. The whole assembly is located above the sliding 1 and corresponds one-to-one with the lock cylinder assembly 4. When the sliding shovel assembly 5 presses the force-bearing end of the rocker, the rocker rotates around the hinge shaft. The driving end simultaneously applies an upward or downward force to the lock cylinder, converting the horizontal movement of the shovel into the vertical movement of the lock cylinder, thereby realizing the unlocking or locking action of the lock cylinder. The arc-shaped abutment surface 33 of the rocker driving end fits against the upper end surface of the lock cylinder and can slide along the upper end surface of the lock cylinder during rotation, ensuring that the driving force is transmitted evenly, avoiding sliding jamming caused by the force deviation of the lock cylinder, and reducing local wear between the lock cylinder and the rocker, thus extending the service life of the structure. Lock cylinder assembly 4 includes a first lock cylinder 41 and a second lock cylinder 42, both of which are columnar structures. The lower end of the first lock cylinder 41 is provided with a protrusion 43 that matches the limiting groove 23, and the lower end of the second lock cylinder 42 is provided with a flat pressing part 44. The sliding position 1 is provided with a first sliding hole 45 that matches the first lock cylinder 41 and a second sliding hole 46 that matches the second lock cylinder 42. Both sliding holes penetrate the upper and lower surfaces of the sliding position 1 in a vertical direction. The first lock cylinder 41 and the second lock cylinder 42 are slidably assembled in the corresponding sliding holes, and their upper ends abut against the driving end of the rocker assembly 3, while their lower ends can extend out. At the bottom of slide 1, in the open mold state, the lower end of the first locking core 41 is embedded in the limiting groove 23 of the first stop 21, and the movement of slide 1 is restricted by the cooperation of the protrusion 43 and the groove; when the mold is closed after one injection, the first locking core 41 moves upward along the first sliding hole 45 under the drive of the first rocker plate 31, and the protrusion 43 disengages from the limiting groove 23, releasing the restriction of slide 1; then the second locking core 42 moves downward along the hook section of the second sliding hole 46 under the drive of the slide shovel 51 of the first injection station, and the slide 1 is locked by the contact of the flat pressing part 44 with the shovel, which counteracts the tendency of slide 1 to move backward caused by the injection pressure; The sliding shovel assembly 5 includes a first injection molding station sliding shovel 51 and a second injection molding station sliding shovel 52. The first injection molding station sliding shovel 51 includes a first pressing section 511, a pushing section 512, and a second pressing section 513 connected in sequence. It is located above the front end of the slide 1, and its movement path covers the force-bearing end of the first rocker 31, the front end face of the slide 1, and the planar pressing part 44 of the second lock core 42. The second injection molding station sliding shovel 52 includes a pressing section 521 and a hooking section 522. It is located above the other side of the front end of the slide 1, and its movement path covers the force-bearing end of the second rocker 32 and the spring block 6. During injection molding, the first injection molding station sliding shovel 51 moves towards the slide 1. In the first pressing section 511, the first rocker plate 31 is pressed to unlock slide 1, and the pushing section 512 pushes slide 1 to the mold closing position. Finally, the second pressing section 513 presses the second locking core 42 to lock slide 1, thus eliminating the need for additional driving components and improving mold closing efficiency. During the second injection mold closing, the slide shovel 52 of the second injection station presses the second rocker plate 32 to unlock slide 1, ensuring that slide 1 can adapt to the molding requirements during the second injection. During the second injection mold opening, the slide shovel 52 of the second injection station hooks the spring block 6 through the hooking section 522, driving slide 1 to retreat and reset slide 1. The entire process uses mechanical transmission instead of hydraulic drive to avoid unstable control of slide 1 caused by pressure fluctuations. The spring block 6 is a block structure. Its front end is detachably connected to the rear end face of the slide 1 by bolts. The rear end is provided with a hook groove 61 with an opening facing the slide shovel 52 of the second injection station. The hook groove 61 is adapted to the shape of the hook section 522 of the slide shovel 52 of the second injection station. When the mold is opened for the second injection, the hook section 522 of the slide shovel 52 of the second injection station is inserted into the hook groove 61 of the spring block 6. When the shovel moves backward, the spring block 6 and the slide 1 move backward synchronously through the hook groove 61, ensuring that the backward movement of the slide 1 is smooth and the stroke is accurate. The detachable connection design of the spring block means that after the hook groove 61 is worn due to long-term use, the spring block 6 can be replaced separately without disassembling the slide 1 as a whole, which reduces maintenance difficulty, reduces equipment downtime, and ensures production continuity.

[0020] refer to Figure 2 Specifically, the driving ends of the first rocker 31 and the second rocker 32 are provided with arc-shaped abutment surfaces 33. The arc-shaped abutment surfaces 33 are in contact with the upper end surface of the corresponding lock cylinder. When the rocker rotates around the hinge axis, the arc-shaped abutment surfaces 33 can slide along the upper end surface of the lock cylinder to drive the lock cylinder to move vertically along the sliding hole.

[0021] refer to Figure 6 Specifically, the width of the hook groove 61 of the spring block 6 is greater than the thickness of the hook section 522 of the second injection molding station sliding shovel 52, and the bottom of the hook groove 61 is provided with an arc-shaped transition surface; at the end of the hook section 522 of the second injection molding station sliding shovel 52, there is an arc-shaped head that matches the bottom of the hook groove 61.

[0022] refer to Figure 2 Specifically, the first pressing section 511 and the second pressing section 513 of the first injection molding station sliding shovel are both provided with inclined pressing surfaces 514 at their lower ends. The inclined pressing surfaces 514 are inclined at the same angle as the upper surface of the corresponding rocker plate force-bearing end. The pushing section 512 has a straight structure and is parallel to the front end face of the sliding section 1.

[0023] refer to Figure 2 Specifically, the limiting groove 23 of the first stop 21 is provided with a guide slope 24, which is adapted to the outer slope of the protrusion 43 at the lower end of the first lock cylinder 41, and is used to guide the protrusion 43 to slide into or out of the limiting groove 23; the side of the first stop 21 near the retraction direction of the moving position 1 is provided with an arc-shaped guide surface 25, the curvature of which is consistent with the outer circumferential curvature of the first lock cylinder 41.

[0024] Example 2: A mechanical slide lock control method for a two-color mold, employing a mechanical slide block lock structure for a two-color mold as shown in Example 1, includes the following steps: S1: When the mold is in the open state, the slide 1 remains in the retracted state. The protrusion 43 at the lower end of the first locking core 41 is embedded in the limiting groove 23 of the first stop 21 to restrict the movement of the slide 1. In S1, the physical engagement between the first locking core 41 and the first stop 21 provides initial positioning for the slide 1, preventing the slide 1 from shifting due to external force in the open state, ensuring that the subsequent mold closing action can be carried out based on the accurate initial position, and reducing product molding defects caused by mold closing deviation. S2: Start the mold closing at the first injection station. The sliding shovel 51 of the first injection station moves towards the sliding position 1. The inclined pressing surface 514 of its first pressing section 511 first contacts the force-bearing end of the first rocker 31, driving the first rocker 31 to rotate around the hinge axis, causing the first lock core 41 to move upward along the first sliding hole 45, and the protrusion 43 to completely disengage from the limiting groove 23. Then, the pushing section 512 contacts the front end face of the sliding position 1, pushing the block to the mold closing position. Finally, the inclined pressing surface 514 of the second pressing section 513 presses against the flat surface of the second lock core 42. When the first locking core 41 is completely disengaged from the limiting groove 23, it can prevent interference between parts during mold closing. The precise pushing of the slide 1 to the mold closing position can ensure the accuracy of the molding cavity. The second locking core 42 avoids the loosening of the slide 1 caused by the unstable driving pressure of the traditional hydraulic cylinder, thus reducing defects such as product damage and burrs. S3: After injection molding at the first injection station, the front mold opens. Because the second locking core 42 remains locked to slide 1, the mold rotates 180 degrees to switch to the second injection station. When the front mold opens, the second locking core 42 continues to lock slide 1, ensuring that slide 1 will not be displaced as the front mold opens. During the mold rotation, the stable state of slide 1 can prevent the semi-finished product from shifting after molding, ensuring that the semi-finished product and the second injection molding cavity are accurately connected during the second injection molding, reducing the splicing deviation of two-color products, and improving the product appearance and dimensional accuracy. S4: Start the mold closing of the second injection station. The slide shovel 52 of the second injection station moves towards the slide 1. Its pressing section 521 contacts the force-bearing end of the second rocker plate 32, driving the second rocker plate 32 to rotate around the hinge axis. This causes the second locking core 42 to move upward along the second sliding hole 46 and disengage from the locked position, thus unlocking the slide 1. In S4, through the linkage between the second rocker plate 32 and the second locking core 42, the locking of the slide 1 is precisely released, allowing the slide 1 to be adjusted according to the two-shot molding requirements. This ensures that the slide 1 can adapt to the molding cavity structure of the second injection station during two-shot injection molding, guaranteeing the molding quality of the two-color product. S5: After injection molding at the second injection station, the mold opening at the second injection station is initiated. During the retraction process of the sliding block 52 at the second injection station, the arc-shaped head of its hooking section 522 is embedded in the U-shaped hooking groove 61 of the spring block 6. Stable hooking is achieved by the arc-shaped transition surface at the bottom of the hooking groove 61, thereby driving the sliding block 1 to retract synchronously. The first locking core 41 moves with the sliding block 1, and its lower end protrusion 43 slides along the arc-shaped guide surface 25 of the first stop block 21 to the outside of the first stop block 21 until the rear end face of the sliding block 1 is completely in contact with the front end face of the second stop block 22. The sliding block 1 retracts to its position, completing one two-color injection cycle. In S5, during the second injection mold opening, the sliding block 522 drives the sliding block 1 to retract through the spring block 6, and the arc-shaped head and the U-shaped hooking groove 61 of the spring block 6 are engaged. The engagement of the hook groove 61 can prevent disengagement or jamming during the hooking process, ensuring that the slide 1 moves back smoothly; the sliding of the first lock core 41 along the arc guide surface 25 can prevent rigid collision of components; the contact limit between the slide 1 and the second stop 22 can ensure that the slide 1 moves back into place, providing a precise initial position for the next injection molding cycle.

[0025] Specifically, in step S2, when the first injection molding station slide shovel 51 presses the first rocker plate 31, the first rocker plate 31 rotates around the hinge axis at an angle of 15°-30° until the protrusion 43 at the lower end of the first lock core 41 completely disengages from the limiting groove 23 of the first stop block 21, and the guide protrusion 48 of the first lock core 41 moves along the guide keyway 47 of the first sliding hole 45 so that the first lock core 41 only makes vertical displacement.

[0026] Specifically, in step S3, during the process of the mold rotating 180 degrees, the planar pressing part 44 of the second locking core 42 always maintains contact with the second pressing section 513 of the first injection station slide shovel 51, the second locking core 42 maintains the locked position along the guide keyway 47 of the second sliding hole 46, and the displacement of the slide 1 is ≤0.05mm.

[0027] Specifically, in step S5, when the sliding position 1 is retracted into position, the axis of the first lock cylinder 41 and the axis of the first stop 21 are horizontally offset, and the offset distance is not less than the radius of the first lock cylinder 41; the front end face of the second stop 22 is completely in contact with the rear end face of the sliding position 1, and the contact area is not less than 90% of the area of ​​the rear end face of the sliding position 1.

[0028] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make inventive modifications to this embodiment as needed, but as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A mechanical sliding block lock structure for a two-color mold, characterized in that, It includes a sliding block (1), a stop block assembly (2), a rocker assembly (3), a lock cylinder assembly (4), a sliding block shovel assembly (5), and a spring block (6); The stop assembly (2) includes a first stop (21) and a second stop (22) spaced apart. The first stop (21) is located below the moving path at the front end of the slide (1), and its upper end face is provided with a limiting groove (23) adapted to the lock core assembly (4) to limit the slide (1) from moving backward when the mold is open. The second stop (22) is located at the end of the moving path at the rear end of the slide (1), and its front end face is flat and parallel to the rear end face of the slide (1) to limit the backward stroke of the slide (1) after the mold is opened at the second injection station. The rocker assembly (3) includes a first rocker (31) and a second rocker (32). The middle parts of the first rocker (31) and the second rocker (32) are hinged to the mold body of the two-color mold through a hinge shaft. One end of the rocker is the force-bearing end that cooperates with the sliding shovel assembly (5), and the other end is the driving end that abuts against the lock core assembly (4). The whole assembly is located above the sliding position (1) and corresponds one-to-one with the lock core assembly (4). The lock cylinder assembly (4) includes a first lock cylinder (41) and a second lock cylinder (42), both of which are columnar structures. The lower end of the first lock cylinder (41) is provided with a protrusion (43) that is adapted to the limiting groove (23), and the lower end of the second lock cylinder (42) is provided with a flat pressing part (44). The sliding position (1) is provided with a first sliding hole (45) adapted to the first lock cylinder (41) and a second sliding hole (46) adapted to the second lock cylinder (42). Both sliding holes penetrate the upper and lower surfaces of the sliding position (1) in a vertical direction. The first lock cylinder (41) and the second lock cylinder (42) are respectively slidably assembled in the corresponding sliding holes. Their upper ends are in contact with the driving end of the rocker assembly (3), and their lower ends can extend out of the bottom of the sliding position (1). The sliding shovel assembly (5) includes a first injection molding station sliding shovel (51) and a second injection molding station sliding shovel (52). The first injection molding station sliding shovel (51) includes a first pressing section (511), a pushing section (512), and a second pressing section (513) connected in sequence. It is located above the front end of the sliding position (1), and its movement path covers the force-bearing end of the first rocker (31), the front end face of the sliding position (1), and the planar pressing part (44) of the second lock core (42). The second injection molding station sliding shovel (52) includes a pressing section (521) and a hooking section (522), located above the other side of the front end of the sliding position (1). Its movement path covers the force-bearing end of the second rocker (32) and the spring block (6). The spring block (6) is a block structure. Its front end is detachably connected to the rear end face of the slide (1) by bolts. The rear end is provided with a hook groove (61) with an opening facing the slide shovel (52) of the second injection molding station. The hook groove (61) is adapted to the shape of the hook section (522) of the slide shovel (52) of the second injection molding station.

2. The mechanical sliding block lock structure for a two-color mold according to claim 1, characterized in that, The first rocker (31) and the second rocker (32) are both provided with an arc-shaped abutment surface (33) at their driving ends. The arc-shaped abutment surface (33) is in contact with the upper end surface of the corresponding lock cylinder. When the rocker rotates around the hinge axis, the arc-shaped abutment surface (33) can slide along the upper end surface of the lock cylinder to drive the lock cylinder to move vertically along the sliding hole.

3. The mechanical sliding block lock structure for a two-color mold according to claim 1, characterized in that, The width of the groove (61) of the spring block (6) is greater than the thickness of the hook section (522) of the second injection molding station shovel (52), and the bottom of the groove (61) is provided with an arc-shaped transition surface.

4. The mechanical sliding block lock structure for a two-color mold according to claim 1, characterized in that, The first pressing section (511) and the second pressing section (513) of the first injection molding station slide shovel are both provided with inclined pressing surfaces (514) at their lower ends. The inclined pressing surfaces (514) are inclined at the same angle as the upper surface of the corresponding rocker end. The pushing section (512) is a straight structure and is parallel to the front end of the slide (1).

5. A mechanical sliding block lock structure for a two-color mold according to claim 1, characterized in that, The first stop (21) has a guide slope (24) at the opening of the limiting groove (23). The guide slope (24) is adapted to the outer slope of the protrusion (43) at the lower end of the first lock cylinder (41) to guide the protrusion (43) to slide into or out of the limiting groove (23). The first stop (21) has an arc-shaped guide surface (25) on the side near the retraction direction of the moving position (1). The curvature of the arc-shaped guide surface (25) is consistent with the outer circumferential curvature of the first lock cylinder (41).

6. A mechanical slide (1) lock control method for a two-color mold, employing a mechanical slide slider lock structure for a two-color mold as described in any one of claims 1-5; characterized in that, Includes the following steps: S1: When the mold is in the open state, the slide (1) remains in the backward state, and the protrusion (43) at the lower end of the first lock core (41) is embedded in the limiting groove (23) of the first stop (21) to restrict the movement of the slide (1). S2: Start the mold closing at the first injection station. The first injection station slide shovel (51) moves towards the slide (1). The inclined pressing surface (514) of its first pressing section (511) first contacts the force-bearing end of the first rocker (31), driving the first rocker (31) to rotate around the hinge axis, so that the first lock core (41) moves upward along the first sliding hole (45), and the protrusion (43) completely disengages from the limiting groove (23). Then the pushing section (512) contacts the front end face of the slide (1), pushing the block to the mold closing position. Finally, the inclined pressing surface (514) of the second pressing section (513) contacts the flat pressing part (44) of the second lock core (42), driving the second lock core (42) to move downward along the second sliding hole (46) to the locking position, realizing the locking of the slide (1). S3: After injection molding at the first injection station, the front mold opens. Because the second locking core (42) keeps the slide (1) locked, the mold rotates 180 degrees to switch to the second injection station. S4: Start the mold closing of the second injection station. The slide shovel (52) of the second injection station moves towards the slide (1). Its pressing section (521) contacts the force-bearing end of the second rocker (32), driving the second rocker (32) to rotate around the hinge axis, so that the second lock core (42) moves upward along the second sliding hole (46) to disengage from the locked position, thereby unlocking the slide (1). S5: After the second injection molding station is injection molded, the second injection molding station is started to open the mold. During the retraction process of the second injection molding station slide shovel (52), the arc head of its hook section (522) is embedded in the U-shaped hook groove (61) of the spring block (6). Stable hooking is achieved by the arc transition surface at the bottom of the hook groove (61), which in turn drives the slide (1) to retract synchronously. The first lock core (41) moves with the slide (1), and its lower end protrusion (43) slides along the arc guide surface (25) of the first stop (21) to the outside of the first stop (21) until the rear end face of the slide (1) is completely attached to the front end face of the second stop (22). The slide (1) retracts to the position and completes one two-color injection molding cycle.

7. A mechanical sliding (1) lock for a two-color mold according to claim 6, characterized in that, In step S2, when the first injection molding station sliding shovel (51) presses the first rocker (31), the first rocker (31) rotates around the hinge axis at an angle of 15°-30° until the protrusion (43) at the lower end of the first lock core (41) is completely disengaged from the limiting groove (23) of the first stop (21), and the guide protrusion (48) of the first lock core (41) moves along the guide keyway (47) of the first sliding hole (45) so that the first lock core (41) only makes vertical displacement.

8. A mechanical slide (1) lock control method for a two-color mold according to claim 6, characterized in that, In step S3, during the process of the mold rotating 180 degrees, the planar pressing part (44) of the second lock core (42) always keeps in contact with the second pressing section (513) of the first injection station slide shovel (51), the second lock core (42) keeps locked along the guide keyway (47) of the second sliding hole (46), and the displacement of the slide (1) is ≤0.05mm.

9. A mechanical slide (1) lock control method for a two-color mold according to claim 6, characterized in that, In step S5, when the moving position (1) moves back to its position, the axis of the first lock cylinder (41) and the axis of the first stop (21) are offset in the horizontal direction, and the offset distance is not less than the radius of the first lock cylinder (41); the front end face of the second stop (22) is completely attached to the rear end face of the moving position (1), and the attachment area is not less than 90% of the area of ​​the rear end face of the moving position (1).

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