Clamping assembly and die

Abstract

The invention discloses a clamping assembly and a mold, and relates to the technical field of injection molds, the clamping assembly is used for being fixedly connected with a positioning sleeve internally sleeved with a threaded core, and the clamping assembly comprises a mounting plate and a locking assembly; the mounting plate is partially hollowed out to form two parallel elastic arms, and the two elastic arms are partially, deviated from each other and concavely arranged, so that a clamping space is defined between the two elastic arms; the locking assembly is connected to the free ends of the two elastic arms and used for adjusting the distance between the free ends of the two elastic arms so that the size of the clamping space can be adjusted, and the locking assembly is used for clamping and fixing a positioning sleeve arranged in the clamping space in a penetrating mode. According to the technical scheme, the clamping space is used for containing the copper sleeve, the distance between the two elastic arms is adjusted through the locking assembly, the two elastic arms can clamp and fix the copper sleeve, interference between threads on the threaded core and threads of a product is avoided when the threaded core retreats, and therefore the technical effect of avoiding damage to the threads of the product is achieved.

Description

Technical Field

[0001] This invention relates to the field of injection mold technology, and in particular to a clamping assembly and a mold. Background Technology

[0002] In injection molds, the conventional design of the unscrew mechanism uses a drive device to rotate the threaded core, which, constrained by a copper sleeve, rotates backward and ejects from the product. If the copper sleeve constraining the threaded core rotates, it will affect the normal ejection of the product, causing the threads to be squeezed and resulting in damage to the inner thread.

[0003] The common method for constraining copper bushings is to use locating blocks to limit their rotation and fix them in place. However, machining errors can affect the positional accuracy of the locating blocks, thus impacting the effectiveness of the constraint. When the copper bushing rotates and the core retracts, the forming thread at its front end interferes with the product thread, thereby damaging the product thread. Summary of the Invention

[0004] The main objective of this invention is to provide a clamping assembly and a mold, which aims to provide a structure that can completely fix the copper sleeve.

[0005] To achieve the above objectives, the present invention proposes a clamping assembly for fixed connection with a positioning sleeve having a threaded core inside. The clamping assembly includes: a mounting plate and a locking assembly; the mounting plate is partially hollowed out to form two parallel elastic arms, the two elastic arms being partially recessed away from each other to define a clamping space between them; the locking assembly is connected to the free ends of the two elastic arms to adjust the distance between the free ends of the two elastic arms to adjust the size of the clamping space, thereby clamping and fixing the positioning sleeve inserted within the clamping space.

[0006] In one embodiment, the clamping space is disposed through a first direction, and the elastic arm extends along a third direction; One of the elastic arms is provided with a countersunk hole extending along the second direction, and the other elastic arm is provided with a threaded hole extending along the second direction, wherein the countersunk hole and the threaded hole are arranged opposite to each other in the third direction; The locking assembly includes a countersunk screw, which is installed in the countersunk hole and partially extends into the threaded hole and is threadedly connected to the threaded hole.

[0007] In one embodiment, the mounting plate is provided with a through hole extending along a second direction, the through hole being coaxially arranged with the countersunk hole, and the diameter of the through hole being greater than or equal to the diameter of the countersunk portion of the countersunk hole.

[0008] In one embodiment, the threaded hole is provided on the third-order upward near the free end of the elastic arm.

[0009] In one embodiment, the two elastic arms, the countersunk hole, the threaded hole, and the countersunk screw are arranged in a one-to-one correspondence as structural groups, and multiple structural groups are provided on the same mounting plate.

[0010] The present invention also proposes a mold, including a clamping assembly, the clamping assembly comprising: a mounting plate and a locking assembly; the mounting plate is partially hollowed out to form two parallel elastic arms, the two elastic arms being partially recessed away from each other to define a clamping space between them; the locking assembly is connected to the free ends of the two elastic arms to adjust the distance between the free ends of the two elastic arms to adjust the size of the clamping space, and to clamp and fix a positioning sleeve inserted into the clamping space.

[0011] In one embodiment, the mold includes a mold frame, a threaded core, and a positioning sleeve. The threaded core is threadedly connected to the positioning sleeve and is movably disposed along a first direction. The mold frame has a first cavity and a second cavity that are connected to each other. The second cavity is used for fixing and placing the workpiece to be processed. The positioning sleeve is fixedly disposed in the first cavity, the threaded core is installed in the first cavity and extends partially into the second cavity to perform thread processing on the workpiece, the mounting plate is fixedly installed in the mold frame, and the elastic arm is located in the first cavity to clamp the positioning sleeve.

[0012] In one embodiment, the mold further includes a positioning element having a limiting rod extending along a first direction. The limiting rod is installed in the first cavity and fixedly connected to the mold frame, such that the limiting rod is located at the center of the clamping space. The threaded core extends along a first direction, and a limiting hole is provided at one end for the insertion of the limiting rod.

[0013] In one embodiment, the positioning member further includes a limiting block located at one end of the limiting rod, and the limiting block abuts against the positioning sleeve in a first direction.

[0014] In one embodiment, a gear is provided on the outer side of the threaded core; The mold also includes a hydraulic rod and a rack. The hydraulic rod is fixedly disposed on the outside of the mold frame and is drivenly connected to the rack. The rack extends into the first cavity and engages with the gear.

[0015] In the technical solution of this invention, the elastic arm is an elastic component that can deform under the action of external force, allowing the elastic arm to swing toward or away from another elastic arm. The clamping space is formed by the notches formed by the recesses on the two elastic arms and the gap between the two elastic arms. The clamping space is used to place the positioning sleeve. The distance between the two elastic arms is adjusted by the locking assembly to reduce the clamping space, so that the two elastic arms can clamp and fix the copper sleeve, avoiding interference between the threads on the threaded core and the product threads when the threaded core retracts, thereby achieving the technical effect of avoiding damage to the product threads. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, 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 the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a front view of an embodiment of the clamping assembly provided by the present invention; Figure 2 for Figure 1 A side view of the clamping assembly; Figure 3 for Figure 1 A schematic diagram of the structure in which the clamping assembly mates with the threaded core and positioning sleeve; Figure 4 A schematic diagram of the structure of an embodiment of the mold provided by the present invention.

[0018] Explanation of icon numbers: 100. Clamping assembly; 1. Mounting plate; 11. Elastic arm; 111. Free end; 12. Countersunk hole; 13. Threaded hole; 14. Through hole; 15. Clamping space; 2. Locking assembly; 21. Countersunk screw; 1000, Mold; 200, Mold base; 300, Threaded core; 400, Positioning sleeve; 500, Positioning component; 510, Limiting rod; 520, Limiting block.

[0019] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0022] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0023] In injection molds, the conventional design of the unscrew mechanism involves a drive unit rotating the threaded core, which then rotates backward and ejects from the product under the constraint of a copper sleeve. If the copper sleeve constraining the threaded core rotates, it will affect the normal ejection of the product, causing the threads to be squeezed and damaging the inner wall threads. The common method of constraining the copper sleeve is to use a locating block to limit its rotation and fix it in place. However, machining errors can affect the positional accuracy of the locating block, thus affecting the effective constraint. When the copper sleeve rotates, the forming thread at the front end of the core interferes with the product threads as it retracts, thereby damaging the product threads.

[0024] This invention proposes a clamping assembly.

[0025] Please see Figure 1In one embodiment of the present invention, the clamping assembly 100 is used to be fixedly connected to the positioning sleeve 400, which has a threaded core 300 inside. The clamping assembly 100 includes: a mounting plate 1 and a locking assembly 2; the mounting plate 1 is partially hollowed out to form two parallel elastic arms 11, and the two elastic arms 11 are partially recessed away from each other to define a clamping space 15 between them; the locking assembly 2 is connected to the free ends 111 of the two elastic arms 11 to adjust the distance between the free ends 111 of the two elastic arms 11 to adjust the size of the clamping space 15, so as to clamp and fix the positioning sleeve 400 passing through the clamping space 15.

[0026] In the technical solution of this invention, the elastic arm 11 is an elastic component that can deform under the action of external force, allowing the elastic arm 11 to swing toward or away from the other elastic arm 11. The clamping space 15 is formed by the notches formed by the recesses on the two elastic arms 11 and the gap between the two elastic arms 11. The clamping space 15 is used to place the positioning sleeve 400. By adjusting the distance between the two elastic arms 11 through the locking assembly 2, the clamping space 15 is reduced, allowing the two elastic arms 11 to clamp and fix the copper sleeve, avoiding interference between the threads on the threaded core 300 and the product threads when the threaded core 300 retracts, thereby achieving the technical effect of avoiding damage to the product threads.

[0027] The clamping assembly 100 can take various forms. In one embodiment, the clamping assembly 100 may include a slide cylinder with two relatively close or relatively far components. These two components are respectively connected to two elastic arms 11. Therefore, the distance between the free ends 111 of the two elastic arms 11 can be adjusted by adjusting the slide cylinder, thereby adjusting the size of the clamping space 15 to clamp and fix the positioning sleeve 400 passing through the clamping space 15. In another embodiment, the clamping assembly 100 may include two limiting screws. The two limiting screws are installed on both sides of the mounting plate 1 and threadedly connected to the mounting plate 1. They abut against the opposite sides of the two elastic elements. Rotating the two limiting screws brings them closer together, thereby bringing the two limiting arms closer together and clamping the positioning sleeve 400.

[0028] And the embodiments used in this invention: Please refer to Figure 1 and Figure 2The clamping space 15 is provided through in a first direction, and the elastic arm 11 extends in a third direction. One of the elastic arms 11 is provided with a countersunk hole 12 through in a second direction, and the other elastic arm 11 is provided with a threaded hole 13 through in the second direction. The countersunk hole 12 and the threaded hole 13 are arranged opposite to each other in the third direction. The locking assembly 2 includes a countersunk screw 21, which is installed in the countersunk hole 12 and partially extends into the threaded hole 13 and is threadedly connected to the threaded hole 13. When the threaded core 300 and the positioning sleeve 400 are installed, they extend in the first direction, are located in the clamping space 15, and pass through the mounting plate 1. The inner wall of the countersunk hole 12 is smooth, and the countersunk hole 12 uses its internal steps to limit the countersunk screw 21 in the second direction toward the other elastic arm 11. When the countersunk screw 21 rotates in the forward direction, the other elastic arm 11 deforms under the action of the threaded engagement between the countersunk screw 21 and the other elastic arm 11, moving closer to the first elastic arm 11 in a second direction to reduce the gap between the two elastic arms 11. When the countersunk screw 21 rotates in the reverse direction, the other elastic arm 11 gradually recovers its deformation and moves away from the first elastic arm 11 in a second direction. At this time, the positioning sleeve 400 can be removed from the mounting plate 1. It is also worth mentioning that regardless of whether the countersunk screw 21 rotates in the forward or reverse direction, both elastic arms 11 deform, moving closer to the center position or separating to the side position simultaneously. This ensures that the clamping position of the two elastic arms 11 corresponds to the center position in the clamping space 15, thus fixing the positioning sleeve 400 in the center position in the clamping space 15. In this embodiment, the number of parts is minimal, the structure is simple, and the cost is lowest.

[0029] Because the two elastic arms 11 are positioned in the middle of the mounting plate 1, the countersunk screw 21 can be installed into the threaded hole 13 and the countersunk hole 12. In one embodiment, the mounting plate 1 is provided with a through hole 14 extending in a second direction, the through hole 14 being coaxially arranged with the countersunk hole 12, and the diameter of the through hole 14 being greater than or equal to the diameter of the countersunk portion of the countersunk hole 12. The through hole 14 is located on the same side of the two elastic arms 11, allowing the countersunk screw 21 to pass through the countersunk hole 12 and then into the threaded hole 13. In order for the countersunk screw 21 to pass through the through hole 14, the diameter of the through hole 14 needs to be greater than or equal to the diameter of the countersunk portion of the countersunk hole 12. Since the diameter of the countersunk portion of the countersunk hole 12 is greater than the diameter of the head of the countersunk screw 21, and the diameter of the through hole 14 is also greater than or equal to the diameter of the countersunk portion of the countersunk hole 12, the diameter of the through hole 14 is greater than or equal to the diameter of the head of the countersunk screw 21, thus ensuring that the countersunk screw 21 can pass through smoothly.

[0030] In order to clamp the positioning sleeve 400, in one embodiment, please refer to Figure 1The threaded hole 13 is located in the third direction, close to the free end 111 of the elastic arm 11. This arrangement utilizes the lever principle: the force multiplied by the force arm equals the resistance multiplied by the resistance arm. To increase the force of clamping the positioning sleeve 400, the force of clamping the positioning sleeve 400 is equal in magnitude to the resistance (opposite in direction), so it is necessary to increase the force or the force arm and / or decrease the resistance arm. The resistance arm is related to the distance from the fixed end of the elastic arm 11 to its locally recessed portion, therefore the locally recessed portion needs to be close to the fixed end of the elastic arm 11. The force arm is related to the distance from the fixed end of the elastic arm 11 to the countersunk hole 12 (or threaded hole 13), therefore the countersunk hole 12 (or threaded hole 13) needs to be located away from the fixed end of the elastic arm 11 and close to the free end 111 of the elastic arm 11. The force is the pulling force when the countersunk screw 21 is tightened, and cannot be further increased.

[0031] In production, the clamping assembly 100 is applied in the mold 1000 to process the workpiece. To improve production efficiency, it is considered that multiple workpieces can be processed simultaneously. Therefore, multiple positioning sleeves 400 and threaded cores 300 are provided in the mold 1000. Thus, the clamping assembly 100 needs multiple positioning sleeves 400 to clamp simultaneously. In one embodiment, the two elastic arms 11, the countersunk hole 12, the threaded hole 13, and the countersunk screw 21 are arranged in a one-to-one correspondence as structural groups. Multiple structural groups are arranged on the same mounting plate 1. The multiple structural groups are spaced apart in a third direction, complementing each other and operating independently. Each of the multiple structural groups fixes multiple positioning sleeves 400.

[0032] The present invention also proposes a mold 1000, please refer to [link / reference]. Figure 4 and Figure 3 The mold 1000 includes a clamping assembly 100. The specific structure of the clamping assembly 100 is as described in the above embodiments. Since the mold 1000 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The clamping assembly 100 includes: a mounting plate 1 and a locking assembly 2; the mounting plate 1 is partially hollowed out to form two parallel elastic arms 11, and the two elastic arms 11 are partially recessed away from each other to define a clamping space 15 between them; the locking assembly 2 is connected to the free ends 111 of the two elastic arms 11 to adjust the distance between the free ends 111 of the two elastic arms 11 to adjust the size of the clamping space 15, and to clamp and fix the positioning sleeve 400 inserted in the clamping space 15.

[0033] Specifically, the mold 1000 includes a mold frame 200, a threaded core 300, and a positioning sleeve 400. The threaded core 300 is threadedly connected to the positioning sleeve 400 and is movably arranged along a first direction. The mold frame 200 has a first cavity and a second cavity that are connected to each other. The second cavity is used to fix the workpiece to be processed. The positioning sleeve 400 is fixedly disposed in the first cavity. The threaded core 300 is installed in the first cavity and partially extends into the second cavity to perform thread processing on the workpiece to be processed. The mounting plate 1 is fixedly installed in the mold frame 200, and the elastic arm 11 is located in the first cavity to clamp the positioning sleeve 400. In the mold 1000, the first cavity and the second cavity are arranged and connected in the first direction. In the mold 1000, the mold frame 200, the positioning sleeve 400, the clamping assembly 100, and the workpiece to be processed are all fixed structures. The threaded core 300 is a movable part. When the threaded core 300 rotates forward, it moves forward in the first direction to tap the workpiece. When the threaded core 300 rotates backward, it moves backward in the first direction to retract from the workpiece, achieving separation. The fixed arrangement of the positioning sleeve 400 ensures that the threaded core 300 follows the same path during tapping and retraction, preventing any impact on the threads on the workpiece. The mounting plate 1 is fixedly connected to the mold frame 200 via multiple holes and screw connections, ensuring the mounting plate 1's unique position on the mold frame 200. This, in turn, positions the clamping space 15 at the center of the first cavity. This ensures that the threaded core 300 corresponds to the center of the workpiece in the second cavity, guaranteeing precise machining positioning.

[0034] Since the displacements of the two elastic arms 11 may not be exactly the same, the clamping assembly 100 can only achieve coarse positioning and cannot achieve fine positioning. The main function of the clamping assembly 100 is to achieve fixation. To ensure the position of the threaded core 300 is determined so that the core of the threaded core 300 corresponds to the center position of the workpiece to be processed in the second cavity, the mold 1000 also includes a positioning member 500. The positioning member 500 has a limiting rod 510 extending along a first direction. The limiting rod 510 is installed in the first cavity and fixedly connected to the mold frame 200, so that the limiting rod 510 is located at the center position of the clamping space 15. The threaded core 300 extends along the first direction and has a limiting hole at one end for the limiting rod 510 to be inserted. The diameter of the limiting hole is approximately the same as the diameter of the limiting rod 510, so the threaded core 300 cannot move circumferentially along the limiting rod 510. This ensures that the threaded core 300 can be processed at the center position of the workpiece.

[0035] Although the limiting rod 510 can limit the threaded core 300 in its circumferential direction, it cannot limit the threaded core 300 in its axial direction. Since the position of the threaded core 300 in the first direction is uncertain, the machining depth on the workpiece will vary when machining forward along the first direction. Therefore, it is necessary to limit the threaded core 300 in the first direction. In one embodiment, the positioning member 500 also has a limiting block 520 located at one end of the limiting rod 510, and the limiting block 520 abuts against the positioning sleeve 400 in the first direction. The threaded core 300 is inside the positioning sleeve 400. When the threaded core 300 moves backward to its limit position in the first direction, it also abuts against the limiting block 520 in the first direction. At this point, the distance between the threaded core 300 and the workpiece in the first direction is unique and determined. Using this position as a reference, machining a preset distance forward in the first direction ensures that the machining depth is the same on each workpiece.

[0036] Since the clamping assembly 100, the workpiece to be processed, the positioning sleeve 400, and the threaded core 300 are all located inside the mold frame 200, how to set up a drive source to drive the threaded core 300 to rotate is a problem that needs to be solved. In one embodiment, a gear is provided on the outer side of the threaded core 300; the mold 1000 also includes a hydraulic rod and a rack. The hydraulic rod is fixedly set on the outer side of the mold frame 200 and is drivenly connected to the rack. The rack extends into the first cavity and engages with the gear. By extending and retracting the hydraulic rod, the rack is driven to move in a straight line, which in turn drives the gear to rotate, further driving the threaded core 300 to rotate. Under the action of the positioning sleeve 400 (the positioning sleeve 400 is threadedly connected to the threaded core 300), the threaded core 300 moves in a straight line in the first direction, moving towards the workpiece to be processed. The moving distance of the threaded core 300 in the first direction is related to the stroke of the hydraulic rod, the number of teeth of the gear, and the pitch on the positioning sleeve 400. Select and set appropriate components and their parameters so that the machining depth of the threaded core 300 in the first direction meets the requirements.

[0037] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A clamping assembly for fixed connection with a positioning sleeve having a threaded core inside, characterized in that, The clamping assembly comprises: a mounting plate, which is partially hollowed out to form two parallel elastic arms, both of which are partially hollowed out to define a clamping space therebetween; a locking assembly connected to the free ends of the two elastic arms to adjust the distance between the free ends of the two elastic arms, thereby adjusting the size of the clamping space to clamp a positioning sleeve inserted into the clamping space.

2. The clamp assembly of claim 1, wherein, The clamping space is arranged through in a first direction, and the elastic arms extend in a third direction; one of the elastic arms is provided with a through-hole in a second direction, and the other elastic arm is provided with a threaded hole in the second direction, the through-hole and the threaded hole being oppositely arranged in the third direction; the locking assembly comprises a countersunk screw, which is installed in the through-hole and partially extends into the threaded hole to be threadedly connected with the threaded hole.

3. The clamp assembly of claim 2, wherein, The mounting plate is provided with a through-hole in the second direction, which is coaxially arranged with the through-hole and has a diameter greater than or equal to that of the countersunk portion of the through-hole.

4. The clamp assembly of claim 2, wherein, The threaded hole is arranged close to the free end of the elastic arm in the third direction.

5. The clamp assembly of claim 2, wherein, The two elastic arms, the through-hole, the threaded hole, and the countersunk screw are arranged in a one-to-one correspondence as a structural group on the same mounting plate, and multiple structural groups are arranged on the mounting plate.

6. A mold characterized by, The mold comprises a mold frame, a threaded core, and a positioning sleeve, the threaded core is threadedly connected with the positioning sleeve and movably arranged in a first direction, the mold frame has a first cavity and a second cavity connected thereto, the second cavity is used for placing a workpiece to be machined; 7. The mold of claim 6, wherein the positioning sleeve is fixedly arranged in the first cavity, the threaded core is installed in the first cavity and partially extends into the second cavity to perform thread machining on the workpiece to be machined, the mounting plate is fixedly installed on the mold frame, and the elastic arms are located in the first cavity to clamp the positioning sleeve. The mold further comprises a positioning member having a limiting rod extending in the first direction, the limiting rod is installed in the first cavity and fixedly connected with the mold frame, so that the limiting rod is located at the center position of the clamping space; 8. The mold of claim 7, wherein, the threaded core extends in the first direction and is provided with a limiting hole at one end, the limiting hole is used for inserting the limiting rod. The positioning member further comprises a limiting block located at one end of the limiting rod, and the limiting block abuts against the positioning sleeve in the first direction.

9. The mold of claim 8, wherein, The outer side of the threaded core is provided with a gear; 10. The mold of claim 7, wherein, the mold further comprises a hydraulic rod and a rack, the hydraulic rod is fixedly arranged on the outer side of the mold frame and is drivingly connected with the rack, and the rack extends into the first cavity and cooperates with the gear. ​

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