Demolding mechanism with self-locking function
By designing a self-locking demolding mechanism in mold injection molding, and utilizing the cooperation of pull blocks, limit blocks, anti-reverse blocks, and fixed pressure strips, the problem of hydraulic cylinder slider retraction is solved, thereby achieving slider stability and precise control of the molding surface, and improving product quality and production efficiency.
Patent Information
- Application Number
- CN202520352000.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-28
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-02-28
AI Technical Summary
During the injection molding process, the hydraulic cylinder slider is prone to retraction, which can lead to poor sealing of the mold cavity, overflow of molten plastic, burrs, and product dimensional deviations, affecting product quality and production efficiency.
Design a demolding mechanism with self-locking function. By setting a pull block, a limit block, a stop block and a fixing strip, the stop block and the fixing groove of the fixing strip are used to prevent the slider from moving backward. The movement mode is changed by the wedge surface design to ensure the stability of the slider under injection pressure.
It effectively prevents the slider from retreating under injection pressure, ensures the positional stability of the molding surface, avoids poor sealing of the mold cavity and burrs on the product, and improves product quality and production efficiency.
Smart Images
Figure CN223948424U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to model technical field relates to a demolding mechanism with self locking function. BACKGROUND
[0002] In the field of mold injection molding, with the continuous development of manufacturing industry, the precision, complexity and production efficiency of plastic products are put forward higher and higher requirements. At present, mold injection molding technology is widely used in automobile, electronic, daily necessities and other industries, and provides key parts for various products.
[0003] In the injection molding process, in order to realize the smooth demolding of some irregular structures, part of the model is independently arranged on a slider, and the slider is driven to move by means of oil cylinder structure, so as to realize local independent demolding. However, in the actual production process, the oil cylinder slider has obvious defects in the forming stage. When the injection pressure is applied, the oil cylinder slider is prone to retreat. This retreat will lead to the sealing of the mold cavity, so that the plastic melt overflows, and finally the product appears the phenomenon of burr. The burr not only affects the appearance quality of the product, but also may cause the product size deviation, reduce the qualified rate of the product, increase the production cost, and even make the whole product scrap seriously.
[0004] In view of the above prior art, in order to prevent the slider from retreating in the injection molding process, the applicant designs a high-efficiency and stable oil cylinder slider self-locking demolding mechanism. CONTENT OF THE UTILITY MODEL
[0005] In view of the deficiencies of the prior art, the utility model aims at a demolding mechanism with self locking function.
[0006] The demolding mechanism with self locking function provided in the application adopts the following technical scheme:
[0007] A demolding mechanism with self locking function, comprising a support frame fixedly installed on a mold template, a slider slidingly installed on the support frame and a driving piece for driving the slider to move, one end of the driving piece is connected with the slider, and the end of the slider away from the driving piece is provided with a forming surface of a formed product, characterized in that it further comprises a pulling block, a limiting block, a retreat stop block and a fixed pressing strip.
[0008] The end of the slider close to the driving piece is provided with a sliding cavity, and the limiting block is fixed on the inner wall of the sliding cavity.
[0009] One end of the pulling block is fixed with the driving piece, the pulling block is inserted in the sliding cavity, and the pulling block is provided with a first flange for clamping with the limiting block; when the pulling block abuts against the cavity end face of the sliding cavity, the first flange does not contact with the limiting block.
[0010] The side wall of the sliding block is provided with a sliding hole through which the retreat-stop block is slidingly installed, and the sliding hole is communicated with the sliding cavity; the retreat-stop block is close to one side of the driving member, and the two ends of the retreat-stop block are provided with wedge-shaped surfaces; the fixed pressing strip is fixed on the support frame and located at one side of the sliding block, and a fixed groove is formed on the fixed pressing strip corresponding to the end profile of the retreat-stop block; the second flange is arranged on the pulling block, and when the side of the second flange away from the driving member abuts against the end surface of the retreat-stop block, the end of the retreat-stop block is inserted into the fixed groove, and when the end surface of the retreat-stop block abuts against the side wall of the pulling block, the end of the retreat-stop block is out of the fixed groove.
[0011] The wedge-shaped surface on the second flange away from the driving member side end surface is provided as a wedge-shaped surface matched with the wedge-shaped surface on the retreat-stop block.
[0012] By adopting the above technical scheme, the retreat-stop block and the fixed groove on the fixed pressing strip are matched, when the end of the retreat-stop block is inserted into the fixed groove, the relative position of the retreat-stop block and the fixed pressing strip is fixed, which can further prevent the sliding block from moving towards the driving member, prevent the sliding block from retreating, enhance the stability of the sliding block in the injection molding stage, and effectively prevent the displacement of the sliding block under the injection pressure; the wedge-shaped surfaces matched on the retreat-stop block and the second flange are designed, when the driving member drives the pulling block to move towards the bottom of the sliding cavity, the retreat-stop block converts the linear motion of the second flange into the motion perpendicular to the linear motion of the retreat-stop block through the wedge-shaped surface matched with the second flange, and the retreat-stop block enters the fixed groove on the fixed pressing strip through the compression of the second flange. The limiting block and the first flange are connected through the clamping, and are not directly in contact, when the normal demolding driving is performed, the pulling block first retreats with the driving member; after the first flange abuts against the limiting block, the pulling block starts to retreat synchronously with the sliding block, at this time, the retreat-stop block can move towards the pulling block out of the range of the second flange; the sliding block retreats synchronously with the retreat-stop block, and the retreat-stop block slides towards the pulling block under the cooperation of the wedge-shaped surfaces corresponding to the retreat-stop block and the fixed groove, and the retreat of the sliding block is smoothly completed. By setting the retreat-stop block, the retreat of the sliding block under the injection pressure can be prevented, the position stability of the molding surface in the injection process is ensured, and problems such as poor sealing of the mold cavity, overflow of plastic melt, and appearance of product burrs caused by the retreat of the sliding block are avoided.
[0013] Preferably, the fixed pressing strips are two, and the fixed pressing strips are located at the two sides of the sliding block, and the sliding block and the two fixed pressing strips form a groove for sliding cooperation.
[0014] By adopting the above technical scheme, two fixed pressing strips are arranged, the sliding block and the two fixed pressing strips form a groove for sliding cooperation, the sliding block is better limited and guided, the sliding of the sliding block is more stable, the deviation or shaking of the sliding block caused by uneven force is reduced, and the integrity and reliability of the sliding block in the movement process are enhanced.
[0015] Preferably, the two groups of retreat-stop blocks and second flanges are symmetrically arranged about the sliding block, and two sliding holes are symmetrically arranged on the sliding block corresponding to the two retreat-stop blocks.
[0016] By adopting the above technical scheme, the two groups of retreat-stop blocks and second flanges are symmetrically arranged about the sliding block, and two sliding holes are symmetrically arranged on the sliding block corresponding to the two retreat-stop blocks, so that the forces on both sides of the sliding block are more uniform, the retreat-stop function is further enhanced, the balance and stability of the sliding block when bearing the injection pressure are improved, and it is ensured that the sliding block will not tilt or retreat due to unilateral force, the retreat-stop performance and stability of the sliding block are effectively improved, the possibility of product edge and size deviation is reduced, the product quality and production efficiency are improved, and the rate of defective products is reduced.
[0017] Preferably, the two groups of retreat-stop blocks and second flanges are symmetrically arranged about the sliding block, and two sliding holes are symmetrically arranged on the sliding block corresponding to the two retreat-stop blocks.
[0018] By adopting the above technical scheme, the two groups of retreat-stop blocks and second flanges are symmetrically arranged about the sliding block, and two sliding holes are symmetrically arranged on the sliding block corresponding to the two retreat-stop blocks, so that the forces on both sides of the sliding block are more uniform, the retreat-stop function is further enhanced, the balance and stability of the sliding block when bearing the injection pressure are improved, and it is ensured that the sliding block will not tilt or retreat due to unilateral force, the retreat-stop performance and stability of the sliding block are effectively improved, the possibility of product edge and size deviation is reduced, the product quality and production efficiency are improved, and the rate of defective products is reduced.
[0019] Preferably, the first flange and the second flange are in sliding fit with the sliding cavity, and the groove composed of the two retreat-stop blocks is in sliding fit with the pulling block.
[0020] By adopting the above technical scheme, the first flange and the second flange are in sliding fit with the sliding cavity, which can ensure that the pulling block always remains on the predetermined track during movement and will not deviate or shake, thereby ensuring the movement accuracy of the sliding block and helping to achieve high-precision molding of the product; the groove composed of the two retreat-stop blocks is in sliding fit with the pulling block, which further limits the movement range of the pulling block, so that it moves within a specified range, provides accurate limiting for the retreat distance of the sliding block, and avoids various molding defects caused by excessive retreat of the sliding block.
[0021] Preferably, the first flange is located on the side of the second flange away from the driving member, and the retreat-stop block is provided with a wedge surface on the side close to the second flange, which matches the wedge surface on the second flange.
[0022] By adopting the above technical scheme, the wedge surface is provided on one side of the retreat-stop block, so that the retreat-stop block and the second flange are in abutment through the matching wedge surfaces. The matching of the wedge surfaces can make the connection between the retreat-stop block and the second flange more tight, and the contact between the wedge surfaces can play a certain buffering role, reducing the risk of damage to the parts due to impact.
[0023] Preferably, the driving member is an oil cylinder, and the pulling block is vertically provided with a T-shaped insertion cavity near one end of the oil cylinder piston rod, and the oil cylinder piston rod is provided with a T-shaped insertion block near the one end of the pulling block.
[0024] By adopting the above technical scheme, the connection between the oil cylinder piston rod and the pulling block is more firm and reliable by adopting the T-shaped insertion structure, the driving force of the oil cylinder can be effectively transmitted, the sliding block can move according to the design requirements, and the installation and disassembly are facilitated, the maintenance efficiency of the demolding mechanism is improved, the reliability and stability of the driving mechanism are improved, and the normal movement and demolding effect of the sliding block are ensured.
[0025] Preferably, the support frame is provided with a sliding guide plate at the end away from the driving member, and the sliding block is provided with a sliding groove in sliding cooperation with the sliding guide plate.
[0026] By adopting the above technical scheme, the sliding guide plate and the sliding groove provide additional guidance and support for the sliding block, so that the sliding block moves more stably during movement, the shaking and deviation of the sliding block are reduced, the positioning accuracy and movement accuracy of the sliding block are improved, the sealing of the mold cavity and the forming quality of the product are ensured, and the stability and reliability of the demolding mechanism are improved.
[0027] In summary, the present application has at least one of the following beneficial technical effects:
[0028] 1. By setting the pull block, limit block, retreat block and fixed compression strip, the retreat block and the fixed compression strip on the fixed groove cooperate, when the end of the retreat block is inserted into the fixed groove, the relative position of the retreat block and the fixed compression strip is fixed, which can further prevent the sliding block from moving towards the driving part, prevent the sliding block from retreating, and enhance the stability of the sliding block in the injection molding stage, effectively prevent the displacement of the sliding block under the injection pressure; The wedge surface design on the retreat block and the second flange cooperates, when the driving part drives the pull block to move towards the bottom of the sliding cavity, the retreat block converts the linear motion of the second flange into the motion perpendicular to the linear motion of the retreat block through the wedge surface matched with the second flange, and the retreat block enters the fixed groove on the fixed compression strip through the compression of the second flange. The limit block and the first flange are connected and not directly contacted, when the normal demolding drive is driven, the pull block retreats first with the driving part; After the first flange abuts against the limit block, the pull block starts to retreat synchronously with the sliding block, at this time the retreat block can move to the pull block out of the range of the second flange; The sliding block retreats synchronously with the retreat block, and the retreat block slides to the pull block while retreating under the cooperation of the corresponding wedge surfaces of the retreat block and the fixed groove, and the retreat of the sliding block is smoothly completed. By setting the retreat block, the retreat of the sliding block under the injection pressure can be prevented, the position stability of the molding surface in the injection process is ensured, and problems such as poor sealing of the mold cavity, overflow of plastic melt and appearance of product burr caused by retreat of the sliding block are avoided;
[0029] 2. Two fixed compression strips are arranged, the sliding block and the two fixed compression strips form a groove sliding cooperation, which can better limit and guide the sliding block, make the sliding of the sliding block more stable, reduce the deviation or shaking of the sliding block caused by uneven stress, and enhance the integrity and reliability of the sliding block in the movement process;
[0030] 3. The first flange and the second flange are both in sliding cooperation with the sliding cavity, so that the pull block can always keep on the predetermined track in the movement process, and deviation or shaking does not occur, thereby the movement precision of the sliding block is ensured, and high-precision molding of the product is helpful to be realized; The groove formed by the two limit blocks and the sliding block slidingly cooperate, which further limits the movement range of the pull block, so that the pull block moves in a specified range, provides accurate limiting for the retreat distance of the sliding block, and avoids various molding defects caused by excessive retreat of the sliding block. BRIEF DESCRIPTION OF DRAWINGS
[0031] Figure 1 It is the overall structure schematic view of the utility model;
[0032] Figure 2 It is Figure 1 A-A sectional view (sliding block extension state) of
[0033] Figure 3 It is the structure schematic view of the sliding block in the retraction state in the utility model.
[0034] Fig. 1, support frame; 121, sliding guide plate; 2, fixed pressing strip; 21, fixed groove; 3, sliding block; 31, forming surface; 32, sliding cavity; 33, sliding groove; 4, pulling block; 41, T-shaped insertion cavity; 5, retreat-stop block; 6, oil cylinder; 61, T-shaped insertion block; 7, limiting block; 8, first flange; 9, second flange; 10, sliding hole. DETAILED DESCRIPTION
[0035] The drawings will be described below in conjunction with the Figures 1-3 The present application is further described in detail.
[0036] The present application discloses a demolding mechanism with self-locking function.
[0037] The demolding mechanism with self-locking function, referring to Figure 1 and Figure 2 , comprises a support frame 1, a fixed pressing strip 2, a sliding block 3, a pulling block 4, a retreat-stop block 5 and a driving member; the support frame 1 is fixedly installed on a mold plate of a mold; the driving member is an oil cylinder 6, and the oil cylinder 6 cylinder body is fixedly installed on the support frame 1; the fixed pressing strip 2 is provided with two, and is fixedly installed on both sides of the support frame 1; the fixed pressing strip 2 is provided with a fixed groove 21 for inserting the retreat-stop block 5; the sliding block 3 is located between the two fixed pressing strips 2, and is in sliding cooperation with the fixed pressing strip 2; one end of the sliding block 3 is provided with a forming surface 31 of a formed product, and the forming surface 31 of the sliding block 3 is used for extending into a mold cavity to form a product; the pulling block 4 is fixedly installed on one end of a piston rod of the oil cylinder 6; one end of the sliding block 3 close to the oil cylinder 6 cylinder body is provided with a sliding cavity 32 for inserting the pulling block 4; the sliding block 3 is provided with a sliding hole 10 penetrating therethrough and slidingly installed on the retreat-stop block 5; the sliding direction of the retreat-stop block 5 is perpendicular to the sliding direction of the pulling block 4; and the sliding cavity 32 of the sliding block 3 is fixedly provided with a limiting block 7.
[0038] The fixed pressing strip 2 is fixedly installed on both sides of the support frame 1 by bolts, and the sliding block 3 is slidingly installed between the two fixed pressing strips 2; the support frame 1 is provided with a sliding guide plate 121; and the sliding block 3 is provided with a sliding groove 33 in sliding cooperation with the sliding guide plate 121; the cooperation of the sliding guide plate 121 and the sliding groove 33 ensures the direction accuracy of the sliding block 3 when sliding along the fixed pressing strip 2.
[0039] One end of the pulling block 4 close to the piston rod of the oil cylinder 6 is provided with a T-shaped insertion cavity 41; and one end of the piston rod of the oil cylinder 6 close to the pulling block 4 is provided with a T-shaped insertion block 61 for insertion and fixation with the insertion cavity 41; the design can accurately transmit the pushing force or pulling force of the piston rod of the oil cylinder 6 to the pulling block 4, thereby ensuring the action accuracy and stability of the demolding mechanism, and facilitating disassembly when the demolding mechanism needs to be maintained, replaced with parts or the like.
[0040] Referring to Figure 2 and Figure 3The two sides of the pulling block 4 along the sliding direction of the pulling block 4 are respectively provided with first flanges 8, and the first flanges 8 are located at one end of the pulling block 4 close to the bottom of the sliding cavity 32. When the pulling block 4 abuts against the bottom of the sliding cavity 32, the first flanges 8 also abut against the bottom of the sliding cavity 32. When the pulling block 4 is moved towards the limiting block 7 by the piston rod of the oil cylinder 6, the pulling block 4 abuts against the limiting block 7 through the first flanges 8, and then the sliding block 3 is moved.
[0041] The one end of the pulling block 4 away from the bottom of the sliding cavity 32 is respectively provided with a second flange 9, and the two sides of the pulling block 4 are both provided with the second flange 9. When the pulling block 4 abuts against the bottom of the sliding cavity 32, the one end of the stop block 5 away from the fixed pressing strip 2 abuts against the second flange 9, and the stop block 5 is simultaneously inserted into the fixed groove 21 on the fixed pressing strip 2 and the sliding hole 10 on the sliding block 3, so that the fixed pressing strip 2 and the sliding block 3 are relatively fixed.
[0042] When the pulling block 4 abuts against the bottom of the sliding cavity 32, the sliding hole 10 corresponds to and communicates with the fixed groove 21, and one end of the stop block 5 abuts against the second flange 9, and the other end extends out of the sliding hole 10 and abuts against the fixed groove 21. When the pulling block 4 abuts against the limiting block 7 through the first flanges 8, the sliding hole 10 communicates with the sliding cavity 31, and the one end of the stop block 5 away from the fixed groove 21 is retracted into the sliding cavity 32 and abuts against the side wall of the pulling block 4, and the other end is retracted into the sliding hole 10.
[0043] The two ends of the side close to the oil cylinder 6 of the stop block 5 are respectively provided with opposite wedge surfaces. The fixed groove 21 and the second flange 9 are also provided with wedge surfaces matched with the two ends of the stop block 5. When the piston rod of the oil cylinder 6 pushes the pulling block 4 to move towards the bottom of the sliding cavity 32, the stop block 5 and the second flange 9 are guided by the contact between the wedge surfaces to more accurately enter the sliding hole 10, and one end of the stop block 5 abuts against the fixed groove 21, and the other end abuts against the side wall of the second flange 9. When the first flange 8 on the pulling block 4 abuts against the limiting block 7, and the sliding block 3 is moved towards the support frame 1 by the pulling force of the piston rod of the oil cylinder 6, in this process, the stop block 5 gradually abuts against the side wall of the pulling block 4 by the guidance of the wedge.
[0044] The side close to the second flange 9 of the limiting block 7 is respectively provided with wedge surfaces matched with the second flange 9. When the pulling block 4 abuts against the bottom of the sliding cavity 32, the wedge surface on the limiting block 7 abuts against the wedge surface on the second flange 9, so that the stress can be distributed along the inclined surface of the wedge surface, thereby reducing the phenomenon that the local stress on the limiting block 7 and the second flange 9 may be too large, reducing the risk of component fatigue and damage caused by stress concentration, and prolonging the service life of the structure.
[0045] The implementation principle of the embodiment of the application is:
[0046] When forming, refer to Figure 3 to Figure 2When the state changes, the piston rod of the oil cylinder 6 pushes the second flange 9 on the pulling block 4 to abut against the stop block 5 to move, and the stop block 5 drives the sliding block 3 to move; when the stop block 5 moves to the fixed groove 21 position, under the action of the wedge surface between the second flange 9 and the stop block 5, the stop block 5 is pushed into the fixed groove 21 while moving forward; after the stop block 5 is completely inserted into the fixed groove 21, the pulling block 4 continues to move forward until it abuts against the bottom of the sliding cavity 32, at which time the side surface of the second flange 9 abuts against the side surface of the stop block 5.
[0047] When demolding, with reference to Figure 2 to Figure 3 When the state changes, the piston rod of the oil cylinder 6 drives the pulling block 4 to move away from the bottom of the sliding cavity 32, the first flange 8 abuts against the limiting block 7 to pull the sliding block 3 to retreat synchronously, the end of the stop block 5 close to the fixed groove 21 is retracted into the sliding hole 10 under the combined action of the retreat force and the wedge surface of the fixed groove 21, and the other end of the stop block 5 abuts against the side wall of the pulling block 4 until the oil cylinder 6 is completely retracted.
[0048] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, so: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.
Claims
1. A demolding mechanism with self-locking function, comprising a support frame (1) fixedly installed on a mold plate, a sliding block (3) slidingly installed on the support frame (1), and a driving member for driving the sliding block (3) to move, one end of the driving member being connected with the sliding block (3), and a forming surface (31) of a formed product being arranged at an end of the sliding block (3) away from the driving member, characterized in that, It also includes pulling block (4), limit block (7), stop block (5) and fixed batten (2); The sliding block (3) is provided with a sliding cavity (32) at one end close to the driving member, and the limit block (7) is fixed on the inner wall of the sliding cavity (32); One end of the pulling block (4) is fixed with the driving member, the pulling block (4) is inserted in the sliding cavity (32), and the pulling block (4) is provided with a first flange (8) matched with the limit block (7); when the pulling block (4) abuts against the cavity end face of the sliding cavity (32), the first flange (8) does not contact with the limit block (7); The side wall of the sliding block (3) is provided with a sliding hole (10) for slidingly installing the stop block (5), and the sliding hole (10) is communicated with the sliding cavity (32); one side of the stop block (5) close to the driving member is provided with a wedge-shaped surface at both ends; the fixed batten (2) is fixed on the support frame (1) and located at one side of the sliding block (3), and the fixed batten (2) is provided with a fixed groove (21) corresponding to the end profile of the stop block (5); the second flange (9) is arranged on the pulling block (4), when the second flange (9) is in abutment with the end face of the stop block (5), the end of the stop block (5) is inserted into the fixed groove (21), when the end face of the stop block (5) is in abutment with the side wall of the pulling block (4), the end of the stop block (5) is out of the fixed groove (21); The second flange (9) is provided with a wedge-shaped surface matched with the wedge-shaped surface on the stop block (5) on the side face away from the driving member.
2. The demolding mechanism having a self-locking function according to claim 1, characterized in that, The fixed batten (2) is two, and the fixed batten (2) is located at both sides of the sliding block (3), and the sliding block (3) and the fixed batten (2) on both sides form a groove sliding fit.
3. The demolding mechanism having a self-locking function according to claim 1, characterized in that, The stop block (5) and the second flange (9) are provided with two groups and are symmetrically arranged about the sliding block (3), and two sliding holes (10) are symmetrically arranged on the sliding block (3) corresponding to the two stop blocks (5).
4. The demolding mechanism having a self-locking function according to claim 1, characterized in that, The limit block (7) and the first flange (8) are provided with two groups and are symmetrically arranged about the sliding block (3).
5. The demolding mechanism having a self-locking function according to claim 1, characterized in that, The first flange (8) and the second flange (9) are in sliding fit with the sliding cavity (32); the groove formed by the two limit blocks (7) is in sliding fit with the pulling block (4).
6. The demolding mechanism having a self-locking function according to claim 1, characterized in that, The first flange (8) is located on the side of the second flange (9) away from the driving member, and the limit block (7) is provided with a wedge-shaped surface matched with the wedge-shaped surface on the second flange (9) on the side close to the second flange (9).
7. The demolding mechanism having a self-locking function according to claim 1, characterized in that, The driving member is an oil cylinder (6), and the pulling block (4) is provided with a T-shaped insertion cavity (41) perpendicular to the piston rod of the oil cylinder (6) at one end close to the piston rod of the oil cylinder (6), and the piston rod of the oil cylinder (6) is provided with a T-shaped insertion block (61) matched with the insertion cavity (41) at one end close to the pulling block (4).
8. The demolding mechanism having a self-locking function according to claim 2, characterized in that, The support frame (1) is provided with a sliding guide plate (121) at one end away from the driving member, and the sliding block (3) is provided with a sliding groove (33) matched with the sliding guide plate (121).