Mold locking mechanism, injection molding machine and injection molding method for producing thin-wall rubber product

Abstract

The invention relates to the technical field of thin-wall rubber product production, and provides a mold locking mechanism for producing a thin-wall rubber product, an injection molding machine and an injection molding method, and the mold locking mechanism comprises a mold locking tail plate connected to an external structure; a mold locking fixed plate; the first sub-mold fixing plate is arranged on the mold locking fixed plate; the mold locking movable plate is arranged between the mold locking tail plate and the mold locking fixed plate in a sliding manner; the second sub-mold fixing plate is arranged on the mold locking movable plate; the pull rods sequentially penetrate through the mold locking tail plate, the mold locking movable plate and the mold locking fixed plate; the main driving piece is arranged on the mold locking tail plate and is used for driving the mold locking movable plate to move; the marginal pressure fine-tuning assembly is used for adjusting the pressure of the edge of the mold; the controller is electrically connected with the main driving piece and the marginal pressure fine adjustment assembly. By means of the technical scheme, the problem that when an existing injection molding machine is used for producing a flat thin-wall rubber product, the strength of the middle and the strength of the edge of the product are inconsistent, and consequently the service life of the product is affected is solved.

Description

Technical Field

[0001] The invention relates to the technical field of production of thin-walled rubber products, and in particular to a clamping mechanism, an injection molding machine and an injection molding method for producing thin-walled rubber products. Background Art

[0002] Thin-walled rubber products usually refer to rubber or plastic products with thin walls. These products require special processes and technologies to ensure product quality and performance during the production process. Such products are usually processed by injection molding. During the injection molding process, the molten material is injected into a closed mold and then cooled and solidified to form the desired product shape. In order to ensure the quality of thin-walled rubber products, it is necessary to accurately control parameters such as injection temperature, pressure and cooling time.

[0003] During the process from the injection of molten material into the mold to the cooling of the material, the clamping force needs to maintain a stable value. If this value fluctuates, the quality of the product will be reduced. Therefore, the clamping force maintains a stable value during this process.

[0004] However, operators found in actual operation that when producing flat thin-walled rubber products, and the center thickness and edge thickness of the rubber products are consistent, although the clamping force is kept at a stable pressure value, the quality of the product center and the quality of the edge are still different. When conducting strength tests on a strength testing machine, it was found that the quality of the middle of the flat thin-walled rubber products is higher than the quality of the edges. Although this product can be used, this form of strength distribution will affect the service life of the product.

[0005] Therefore, a new clamping mechanism is urgently needed. Summary of the invention

[0006] The present invention provides a clamping mechanism, an injection molding machine and an injection molding method for producing thin-walled rubber products, which solves the problem that when the existing injection molding machine produces flat thin-walled rubber products, the strength of the middle and edges of the product is inconsistent, which affects the service life of the product.

[0007] The technical solution of the present invention is as follows: a clamping mechanism for producing thin-walled rubber products, the clamping mechanism comprising:

[0008] The clamping tail plate is connected to the external structure;

[0009] Clamping plate;

[0010] A first sub-mold fixing plate, arranged on the clamping mold fixing plate;

[0011] A mold locking movable plate is slidably arranged between the mold locking tail plate and the mold locking fixed plate;

[0012] A second sub-mold fixing plate is arranged on the clamping movable plate, and the first sub-mold fixing plate and the second sub-mold fixing plate are both used for installing the mold;

[0013] There are multiple and evenly distributed pull rods, each of which passes through the mold locking tail plate, the mold locking movable plate and the mold locking fixed plate in sequence, and the reciprocating sliding stroke of the mold locking movable plate is located in the light rod part of the pull rod;

[0014] A main driving member is arranged on the mold clamping tail plate and has a first driving end, the first driving end is connected to the center position of the back of the mold clamping movable plate, and the main driving member provides the power for the reciprocating sliding of the mold clamping movable plate and the clamping force during injection molding;

[0015] A marginal pressure fine-tuning assembly comprises a fine-tuning driving member, a fine-tuning pressure plate and a pressure sensor, wherein the fine-tuning driving member is arranged on the mold locking tail plate and has a second driving end, the second driving end passes through the mold locking movable plate and is connected to the side of the second sub-mold fixed plate, the fine-tuning pressure plate is arranged on the mold locking movable plate, the pressure sensor is arranged on the mold locking fixed plate, and the fine-tuning pressure plate contacts the pressure sensor after sliding along with the mold locking movable plate;

[0016] A controller is electrically connected to the pressure sensor, the main driving component and the fine-tuning driving component.

[0017] As a further technical solution, there are two marginal pressure fine-tuning components which are symmetrically arranged.

[0018] As a further technical solution, the marginal pressure fine-tuning assembly also includes a height adjustment rod, the height adjustment rod and the mold locking movable plate are threadedly connected, and the fine-tuning pressure plate is arranged at the end of the height adjustment rod.

[0019] As a further technical solution, the marginal pressure fine-tuning assembly further includes a transmission plate, which is detachably fixed to the second sub-mold fixing plate, and a driving end of the fine-tuning driving member is connected to the transmission plate.

[0020] As a further technical solution, the locking mechanism also includes a middle decompression assembly, which includes a transition plate, which is arranged between the locking movable plate and the second sub-mold fixed plate, and a decompression groove is opened at the center position of the side of the transition plate facing the second sub-mold fixed plate.

[0021] As a further technical solution, the middle decompression assembly further includes a magnet and an electromagnet, wherein the magnet is arranged on the second sub-mold fixing plate, the electromagnet is arranged on the bottom wall of the decompression groove, the magnet faces the electromagnet, and the projection of the magnet on the decompression groove is located inside the bottom wall of the decompression groove. The magnet and the electromagnet are arranged at intervals.

[0022] As a further technical solution, the locking mechanism also includes a fixed plate adjustment assembly, and the portion where the pull rod contacts the locking fixed plate is provided with an adjustment thread. The fixed plate adjustment assembly includes an adjustment lock nut and a clamp, the adjustment lock nut is located on the first side of the locking fixed plate, and the clamp is located on the second side of the locking fixed plate, and the adjustment lock nut and the clamp are both mounted on the pull rod.

[0023] As a further technical solution, one of the pull rods corresponds to one of the adjustment lock nuts and one of the clamps.

[0024] The working principle and beneficial effects of the clamping mechanism for producing thin-walled rubber products provided by the present invention are as follows: the clamping mechanism for producing thin-walled rubber products includes a clamping tail plate, a clamping fixed plate, a clamping movable plate, a tie rod, a main driving component, a first sub-mold fixed plate, a second sub-mold fixed plate, a marginal pressure fine-tuning component and a controller. Among them, the clamping movable plate is located between the clamping tail plate and the clamping fixed plate, the tie rods are multiple and evenly arranged, and the multiple tie rods are connected to the clamping fixed plate at one end and to the clamping tail plate at the other end, and the tie rods also pass through the clamping movable plate, the main driving component is arranged on the clamping tail plate, and the main driving component has a first driving end, and the first driving end is connected to the clamping movable plate. The clamping movable plate realizes reciprocating movement along the axial direction of the tie rod by means of the reciprocating movement of the first driving end, and the reciprocating travel of the clamping movable plate is a smooth part on the tie rod, the first sub-mold fixed plate is arranged on the clamping fixed plate and is used to fix the upper mold or the lower mold, and the second sub-mold fixed plate is used to fix the upper mold or the lower mold. The fixed plate is arranged on the clamping movable plate and is used to fix the lower mold or the upper mold; the marginal pressure fine-tuning assembly includes a fine-tuning driving member, a fine-tuning pressure plate and a pressure sensor, the fine-tuning driving member is arranged on the clamping tail plate, and the fine-tuning driving member has a second driving end, and the second driving end passes through the clamping movable plate and is connected to the side of the second sub-mold fixed plate; the fine-tuning pressure plate is arranged on the clamping movable plate, and the fine-tuning pressure plate moves with the clamping movable plate. After the upper mold and the lower mold are completed, the fine-tuning pressure plate will contact the pressure sensor, and when the main driving member is no longer pressurized, the pressure sensor will transmit the pressure value setting at this time to the controller. Before the molten material formally enters the mold, the controller will separately pressurize the fine-tuning drive component according to the value transmitted by the pressure sensor, and the pressurized value is 1.05 to 1.1 times the holding pressure value of the main drive component. Since the fine-tuning drive component acts on both sides of the mold, the clamping pressure value at the edge of the mold is greater than the clamping pressure in the middle of the mold, thereby making the stress values ​​at various locations on the parting surface more consistent. Finally, when the molten material is injected into the mold, the overall thickness of the product can be guaranteed to be consistent during the cooling process of the product, avoiding the problem of thin edge thickness of the molded product caused by the pressure at the edge of the mold being slightly lower than the pressure in the middle of the mold.

[0025] The present invention also provides an injection molding machine for producing thin-walled rubber products, the injection molding machine comprising a clamping mechanism for producing thin-walled rubber products as claimed in any one of the above claims.

[0026] The present invention also provides an injection molding method for producing thin-walled rubber products, which is applied to any one of the above-mentioned clamping mechanisms for producing thin-walled rubber products, and the injection molding method comprises the following steps:

[0027] Step S10, installing the upper mold and the lower mold on the first sub-mold fixing plate and the second sub-mold fixing plate respectively;

[0028] Step S20, controlling the main driving member and the fine-tuning driving member to simultaneously perform a pushing action until the upper mold and the lower mold are completely closed;

[0029] Step S30, after the mold is closed, the main driving member is controlled to maintain a predetermined first pressure value, and the fine-tuning driving member is pressurized according to the feedback value of the pressure sensor; wherein the fine-tuning driving member is pressurized and maintained at a second pressure value, and the second pressure value is 1.05 to 1.1 times the first pressure value;

[0030] Step S40, after the injection molding is completed, the main driving component is controlled to reduce the pressure and maintain it at a third pressure value, and the fine-tuning driving component is maintained at the first pressure value, and the holding time is 20 to 40 seconds; wherein the third pressure value is 0.95 to 0.98 times the first pressure value;

[0031] Step S50: After the pressure holding time is over, the main driving member and the fine-tuning driving member are controlled to simultaneously retract the pushing action;

[0032] Step S60, taking away the thin-walled rubber product after the mold is opened;

[0033] Step S70, repeat steps S20 to S60 until all products are produced.

[0034] The beneficial effects of the injection molding method for producing thin-walled rubber products provided by the present invention are:

[0035] 1. After the mold is closed, the pressure value on the edge of the mold and the pressure value in the middle of the mold are adjusted to ensure that the stress of the product remains consistent during the molding process, thereby ensuring the consistency of the overall thickness after the product is formed.

[0036] Second, a transition plate is arranged between the second sub-mold fixed plate and the clamping movable plate, and a decompression groove is left on the transition plate, thereby reducing the distribution of the force applied by the main driving component to the center of the second sub-mold fixed plate, and ultimately reducing the part where the stress is concentrated on the mold parting surface, thereby improving the uniformity of stress distribution.

[0037] 3. Through the relationship between the pressure values ​​of the main driving part and the fine-tuning driving part during pressure holding, as well as the adjustment of the pressure value of the main driving part during pressure holding during cooling, the stress adjustment of the mold parting surface is achieved, so that the middle stress and edge stress of the product can be kept consistent during the molding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0039] Figure 1 A schematic diagram of the structure of the clamping mechanism provided by the present invention;

[0040] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0041] Figure 3 for Figure 1 A top view of

[0042] Figure 4 for Figure 3 Sectional view at CC;

[0043] Figure 5 for Figure 1 Right view of;

[0044] Figure 6 for Figure 1 Schematic diagram of the clamping mechanism at a second angle;

[0045] Figure 7 for Figure 1 Schematic diagram of the clamping mechanism at a third angle;

[0046] Figure 8 for Figure 7 A partial enlarged view of point B in the middle;

[0047] Fig. 9 The present invention provides a logic diagram of the injection molding method.

[0048] In the figure: 1. clamping tail plate; 2. clamping fixed plate; 3. first sub-mold fixed plate; 4. clamping movable plate; 5. second sub-mold fixed plate; 6. pull rod; 7. main drive member; 8. fine-tuning drive member; 9. fine-tuning pressure plate; 10. pressure sensor; 11. height adjustment rod; 12. transmission plate; 13. transition plate; 14. magnet; 15. electromagnet; 16. pressure relief groove; 17. adjustment lock nut; 18. clamp. DETAILED DESCRIPTION

[0049] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] In actual production, operators found that after injection molding of flat products, the strength of the product edge will be slightly lower than the strength of the product in the middle, especially for such flat rubber products with gong-shaped shells. Although the strength difference is not large, it will also affect the quality and service life of the product. When the product falls to the ground or collides with other objects, the number of damages to the shell edge is much higher than the number of damages to the shell middle. In order to improve product competitiveness and market share, operators and R&D personnel studied how to solve the problem of the thickness of the product edge being slightly lower than the thickness of the product in the middle in terms of temperature, pressure and cooling time. The study found that by adjusting the local pressure during mold injection, the stress distribution at the mold parting surface is more uniform, and the stress value is more consistent, which can make the overall strength of the product more uniform. Therefore, the R&D personnel made further improvements to the clamping mechanism.

[0051] like Figures 1 to 8 As shown, this embodiment proposes a clamping mechanism for producing thin-walled rubber products, and the clamping mechanism includes:

[0052] The clamping tail plate 1 is connected to the external structure;

[0053] Clamping plate 2;

[0054] The first sub-mold fixing plate 3 is arranged on the clamping mold fixing plate 2;

[0055] The mold locking movable plate 4 is slidably arranged between the mold locking tail plate 1 and the mold locking fixed plate 2;

[0056] The second sub-mold fixing plate 5 is arranged on the clamping movable plate 4, and the first sub-mold fixing plate 3 and the second sub-mold fixing plate 5 are both used for installing the mold;

[0057] The pull rods 6 are multiple and evenly arranged, and the pull rods 6 pass through the mold clamping tail plate 1, the mold clamping movable plate 4 and the mold clamping fixed plate 2 in sequence, and the reciprocating sliding stroke of the mold clamping movable plate 4 is located in the light rod part of the pull rod 6;

[0058] The main driving member 7 is arranged on the clamping tail plate 1 and has a first driving end, and the first driving end is connected to the center position of the back of the clamping movable plate 4. The main driving member 7 provides the power for the reciprocating sliding of the clamping movable plate 4 and the clamping force during injection molding;

[0059] The marginal pressure fine-tuning assembly includes a fine-tuning driving member 8, a fine-tuning pressure plate 9 and a pressure sensor 10. The fine-tuning driving member 8 is arranged on the mold clamping tail plate 1 and has a second driving end. The second driving end passes through the mold clamping movable plate 4 and is connected to the side of the second sub-mold fixed plate 5. The fine-tuning pressure plate 9 is arranged on the mold clamping movable plate 4. The pressure sensor 10 is arranged on the mold clamping fixed plate 2. The fine-tuning pressure plate 9 contacts the pressure sensor 10 after sliding along with the mold clamping movable plate 4.

[0060] The controller is electrically connected to the pressure sensor 10 , the main driving component 7 and the fine-tuning driving component 8 .

[0061] In this embodiment, the mold locking mechanism for producing thin-walled rubber products includes a mold locking tail plate 1, a mold locking fixed plate 2, a mold locking movable plate 4, a tie rod 6, a main driving component 7, a first sub-mold fixed plate 3, a second sub-mold fixed plate 5, a marginal pressure fine-tuning component and a controller. Among them, the mold locking movable plate 4 is located between the mold locking tail plate 1 and the mold locking fixed plate 2, and the tie rod 6 is multiple and evenly arranged. The multiple tie rods 6 are connected to the mold locking fixed plate 2 at one end and connected to the mold locking tail plate 1 at the other end. The tie rod 6 also passes through the mold locking movable plate 4. The main driving component 7 is arranged on the mold locking tail plate 1, and the main driving component 7 has a first driving end, and the first driving end is connected to the mold locking movable plate 4. The mold locking movable plate 4 realizes reciprocating movement along the axial direction of the tie rod 6 by means of the reciprocating movement of the first driving end. The reciprocating stroke of the mold locking movable plate 4 is a smooth part on the tie rod 6. The first sub-mold fixed plate 3 is arranged on the mold locking fixed plate 2 and is used to fix the upper mold or the lower mold. The second sub-mold fixed plate 3 is used to fix the upper mold or the lower mold. Plate 5 is arranged on the clamping movable plate 4 and is used to fix the lower mold or the upper mold; the marginal pressure fine-tuning assembly includes a fine-tuning drive 8, a fine-tuning pressure plate 9 and a pressure sensor 10, the fine-tuning drive 8 is arranged on the clamping tail plate 1, and the fine-tuning drive 8 has a second driving end, and the second driving end passes through the clamping movable plate 4 and is connected to the side of the second sub-mold fixed plate 5; the fine-tuning pressure plate 9 is arranged on the clamping movable plate 4, and the fine-tuning pressure plate 9 moves with the clamping movable plate 4. After the upper mold and the lower mold are completed, the fine-tuning pressure plate 9 will contact the pressure sensor 10. When the main drive 7 is no longer pressurized, the pressure sensor 10 will transmit the pressure value setting at this time to the controller. Before the molten material formally enters the mold, the controller will separately pressurize the fine-tuning drive 8 according to the value transmitted by the pressure sensor 10, and the pressurized value is 1.05 to 1.1 times the holding pressure value of the main drive 7. Since the fine-tuning drive 8 acts on both sides of the mold, the locking pressure value at the edge of the mold is greater than the locking pressure in the middle of the mold, thereby making the stress values ​​at various locations on the parting surface more consistent. Finally, when the molten material is injected into the mold, it can be ensured that during the cooling process of the product, the product can maintain the consistency of the overall thickness, avoiding the problem of thin edge thickness of the molded product caused by the pressure at the edge of the mold being slightly lower than the pressure in the middle of the mold.

[0062] It should be noted that the external structure is usually a frame of an injection molding machine, and the main drive member 7 and the fine-adjustment drive member 8 are both common hydraulic cylinders. During the movement of the clamping movable plate 4, the main drive member 7 and the fine-adjustment drive member 8 achieve synchronous expansion and contraction.

[0063] Further, if Figure 1 to Figure 7 As shown, this embodiment proposes that the marginal pressure fine-tuning components are two and symmetrically arranged.

[0064] In this embodiment, in order to make the marginal pressure on the mold in the mold closing state more stable and uniform, two marginal pressure fine-tuning components are provided, and the two marginal fine-tuning components are symmetrically arranged on both sides of the second sub-mold fixing member.

[0065] Typically, a marginal pressure fine-tuning assembly includes a fine-tuning drive 8, a fine-tuning pressure plate 9 and a pressure sensor 10.

[0066] Further, if Figure 1 to Figure 7 As shown, this embodiment proposes that the marginal pressure fine-tuning assembly also includes a height adjustment rod 11 , the height adjustment rod 11 is threadedly connected to the mold locking movable plate 4 , and the fine-tuning pressure plate 9 is arranged at the end of the height adjustment rod 11 .

[0067] In this embodiment, when different products are produced, the thickness of the mold is inconsistent. Therefore, when the mold is closed, the stroke of the locking movable plate 4 is also different, and the height of the fine-tuning pressure plate 9 or the pressure sensor 10 needs to be adjusted. Since the height of the fine-tuning pressure plate 9 is easier to adjust, the marginal pressure fine-tuning assembly also includes a height adjustment rod 11. The height adjustment rod 11 is arranged on the locking movable plate 4. The height adjustment rod 11 and the locking movable plate 4 are threadedly connected, and the fine-tuning pressure plate 9 is arranged at the end of the height adjustment rod 11. In this way, by rotating the height adjustment rod 11, the height of the fine-tuning pressure plate 9 can be changed, thereby adapting to molds of different thicknesses.

[0068] Further, if Figure 1 to Figure 7 As shown, the marginal pressure fine-tuning assembly proposed in this embodiment also includes a transmission plate 12 , which is detachably fixed to the second sub-mold fixing plate 5 , and the driving end of the fine-tuning driving member 8 is connected to the transmission plate 12 .

[0069] In this embodiment, in order to achieve a stable connection between the fine-tuning driving member 8 and the second sub-mold fixing plate 5, a transmission plate 12 is provided on the side of the second sub-mold fixing plate 5, and a connecting hole is opened on the transmission plate 12. The second driving end of the fine-tuning driving member 8 is inserted into the connecting hole, and the connection between the fine-tuning driving member 8 and the transmission plate 12 is achieved. The transmission plate 12 and the second sub-mold fixing plate 5 are detachably connected.

[0070] Further, if Figure 3-4 As shown, this embodiment proposes that the locking mechanism also includes a middle decompression component, which includes a transition plate 13. The transition plate 13 is arranged between the locking movable plate 4 and the second sub-mold fixed plate 5. A decompression groove 16 is opened at the center position of the side of the transition plate 13 facing the second sub-mold fixed plate 5.

[0071] In this embodiment, in order to further adjust the pressure in the middle of the mold, the mold locking mechanism also includes a middle pressure relief assembly, which includes a transition plate 13, which is arranged between the mold locking movable plate 4 and the second sub-mold fixed plate 5. At this time, the second sub-mold fixed plate 5 and the mold locking movable plate 4 are not directly connected, and a pressure relief groove 16 is provided at the center of the side of the transition plate 13 facing the second sub-mold fixed plate 5. When the mold is installed on the second sub-mold fixed plate 5, the centers of the two will overlap as much as possible in projection, and the center of the transition plate 13 and the center of the second sub-mold fixed plate 5 will inevitably overlap in projection. Therefore, due to the provision of the pressure relief groove 16, the pressure on the middle position of the second sub-mold fixed plate 5 will be reduced, and then the mold locking pressure on the middle of the mold will be slightly lower than the mold locking pressure on the peripheral parts. This situation is more conducive to maintaining a good consistency in the overall thickness of the product after injection molding.

[0072] It should be particularly noted that, in order to reduce the stress concentration phenomenon in the decompression groove 16 , the cross section of the decompression groove 16 is set to be circular or elliptical.

[0073] Further, if Figure 3-4 As shown, this embodiment proposes that the middle decompression assembly also includes a magnet 14 and an electromagnet 15, the magnet 14 is arranged on the second sub-mold fixing plate 5, the electromagnet 15 is arranged on the bottom wall of the decompression groove 16, the magnet 14 faces the electromagnet 15, and the projection of the magnet 14 on the decompression groove 16 is located inside the bottom wall of the decompression groove 16. The magnet 14 and the electromagnet 15 are arranged at intervals.

[0074] In this embodiment, in order to further reduce the stress in the middle of the mold, the middle pressure relief assembly further includes a magnet 14 and an electromagnet 15. The magnet 14 is arranged on the second sub-mold fixing plate 5, and the electromagnet 15 is arranged on the bottom wall of the pressure relief groove 16. The electromagnet 15 faces the magnet 14 and there is a gap between the two. When the electromagnet 15 is energized, an attraction force is generated between the electromagnet 15 and the magnet 14, and the attraction force further reduces the stress applied to the middle of the mold by the middle of the second sub-mold fixing plate 5, which is conducive to more effective adjustment of the stress at the mold parting surface.

[0075] Further, if Figures 1 to 8 As shown, this embodiment proposes that the locking mechanism also includes a fixed plate adjustment assembly, and an adjustment thread is provided at the portion where the pull rod 6 contacts the locking fixed plate 2. The fixed plate adjustment assembly includes an adjustment lock nut 17 and a clamp 18. The adjustment lock nut 17 is located on the first side of the locking fixed plate 2, and the clamp 18 is located on the second side of the locking fixed plate 2. The adjustment lock nut 17 and the clamp 18 are both sleeved on the pull rod 6.

[0076] In this embodiment, in order to adapt to different molds, it is necessary to adjust the position of the mold locking plate 2. Therefore, the mold locking mechanism also includes a plate adjustment component, which includes an adjustment lock nut 17 and a clamp 18. A thread is provided at the portion where the tie rod 6 is connected to the mold locking plate 2. The adjustment lock nut 17 and the threaded portion of the tie rod 6 are in a threaded connection form. The adjustment lock nut 17 and the clamp 18 are respectively located on both sides of the mold locking plate 2. The tie rod 6 passes through the adjustment clamp, the mold locking tail plate 1 and the clamp 18 in sequence. When adjusting the mold locking plate 2, first loosen the clamp 18, then separate the adjustment lock nut 17 and the tie rod 6, and then rotate the adjustment clamp until it is adjusted to a suitable position. At this time, the mold locking plate 2 is contacted with the adjustment clamp, and then the clamp 18 is locked. The cooperation of the clamp 18 and the adjustment clamp completes the position adjustment of the mold locking plate 2.

[0077] Further, if Figures 1 to 8 As shown, this embodiment proposes that one pull rod 6 corresponds to one adjustment lock nut 17 and one clamp 18 respectively.

[0078] In this embodiment, in order to ensure the stability of the connection and reduce the complexity of the operation, one pull rod 6 corresponds to one adjustment lock nut 17 and one clamp 18 .

[0079] The present invention also provides an injection molding machine for producing thin-walled rubber products, the injection molding machine comprises any one of the above-mentioned clamping mechanisms for producing thin-walled rubber products. The injection molding machine comprises a control system, and there is data communication between the control system and a controller in the clamping mechanism.

[0080] The present invention also provides an injection molding method for producing thin-walled rubber products, which is applied to any one of the above-mentioned clamping mechanisms for producing thin-walled rubber products, such as Fig. 9 As shown, the injection molding method comprises the following steps:

[0081] Step S10, installing the upper mold and the lower mold on the first sub-mold fixing plate and the second sub-mold fixing plate respectively;

[0082] Step S20, controlling the main driving member and the fine-tuning driving member to simultaneously perform a pushing action until the upper mold and the lower mold are completely closed;

[0083] Step S30, after the mold is closed, the main driving member is controlled to maintain a predetermined first pressure value, and the fine-tuning driving member is pressurized according to the feedback value of the pressure sensor; wherein the fine-tuning driving member is pressurized and maintained at a second pressure value, and the second pressure value is 1.05 to 1.1 times the first pressure value;

[0084] Step S40, after the injection molding is completed, the main driving component is controlled to reduce the pressure and maintain it at a third pressure value, and the fine-tuning driving component is maintained at the first pressure value, and the holding time is 20 to 40 seconds; wherein the third pressure value is 0.95 to 0.98 times the first pressure value;

[0085] Step S50: After the pressure holding time is over, the main driving member and the fine-tuning driving member are controlled to simultaneously retract the pushing action;

[0086] Step S60, taking away the thin-walled rubber product after the mold is opened;

[0087] Step S70, repeat steps S20 to S60 until all products are produced.

[0088] In control.

[0089] The beneficial effects of the injection molding method for producing thin-walled rubber products provided by the present invention are:

[0090] 1. After the mold is closed, the pressure value on the edge of the mold and the pressure value in the middle of the mold are adjusted to ensure that the stress of the product remains consistent during the molding process, thereby ensuring the consistency of the overall thickness after the product is formed.

[0091] Second, a transition plate is arranged between the second sub-mold fixed plate and the clamping movable plate, and a decompression groove is left on the transition plate, thereby reducing the distribution of the force applied by the main driving component to the center of the second sub-mold fixed plate, and ultimately reducing the part where the stress is concentrated on the mold parting surface, thereby improving the uniformity of stress distribution.

[0092] 3. Through the relationship between the pressure values ​​of the main driving part and the fine-tuning driving part during pressure holding, as well as the adjustment of the pressure value of the main driving part during pressure holding during cooling, the stress adjustment of the mold parting surface is achieved, so that the middle stress and edge stress of the product can be kept consistent during the molding process.

[0093] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A clamping mechanism for producing thin-walled rubber products, characterized in that: The clamping mechanism comprises: A clamping tail plate (1) connected to the external structure; Clamping plate (2); A first sub-mold fixing plate (3) is arranged on the clamping mold fixing plate (2); A mold locking movable plate (4) is slidably arranged between the mold locking tail plate (1) and the mold locking fixed plate (2); A second sub-mold fixing plate (5) is arranged on the clamping movable plate (4), and the first sub-mold fixing plate (3) and the second sub-mold fixing plate (5) are both used for installing the mold; The pull rods (6) are multiple and evenly distributed, and the pull rods (6) pass through the mold locking tail plate (1), the mold locking movable plate (4) and the mold locking fixed plate (2) in sequence, and the reciprocating sliding stroke of the mold locking movable plate (4) is located in the light rod part of the pull rod (6); A main driving member (7) is arranged on the mold locking tail plate (1) and has a first driving end, the first driving end is connected to the center position of the back of the mold locking movable plate (4), and the main driving member (7) provides the power for the reciprocating sliding of the mold locking movable plate (4) and the mold locking force during injection molding; A marginal pressure fine-tuning assembly comprises a fine-tuning driving member (8), a fine-tuning pressure plate (9) and a pressure sensor (10), wherein the fine-tuning driving member (8) is arranged on the mold locking tail plate (1) and has a second driving end, the second driving end passes through the mold locking movable plate (4) and is connected to the side of the second sub-mold fixed plate (5), the fine-tuning pressure plate (9) is arranged on the mold locking movable plate (4), the pressure sensor (10) is arranged on the mold locking fixed plate (2), and the fine-tuning pressure plate (9) contacts the pressure sensor (10) after sliding following the mold locking movable plate (4); A controller is electrically connected to the pressure sensor (10), the main drive component (7) and the fine-tuning drive component (8).

2. The clamping mechanism for producing thin-walled rubber products according to claim 1, characterized in that: There are two marginal pressure fine-tuning components which are symmetrically arranged.

3. The clamping mechanism for producing thin-walled rubber products according to claim 2, characterized in that: The marginal pressure fine-tuning assembly further comprises a height-adjusting rod (11), the height-adjusting rod (11) and the mold-locking movable plate (4) are connected in a threaded manner, and the fine-tuning pressure plate (9) is arranged at the end of the height-adjusting rod (11).

4. The clamping mechanism for producing thin-walled rubber products according to claim 3, characterized in that: The marginal pressure fine-tuning assembly further comprises a transmission plate (12), wherein the transmission plate (12) is detachably fixed to the second sub-mold fixing plate (5), and the driving end of the fine-tuning driving member (8) is connected to the transmission plate (12).

5. The clamping mechanism for producing thin-walled rubber products according to claim 1, characterized in that: The mold locking mechanism further comprises a middle decompression assembly, wherein the middle decompression assembly comprises a transition plate (13), wherein the transition plate (13) is arranged between the mold locking movable plate (4) and the second sub-mold fixing plate (5), and a decompression groove (16) is provided at a central position of a side surface of the transition plate (13) facing the second sub-mold fixing plate (5).

6. The clamping mechanism for producing thin-walled rubber products according to claim 5, characterized in that: The middle decompression assembly further comprises a magnet (14) and an electromagnet (15), wherein the magnet (14) is arranged on the second sub-mold fixing plate (5), and the electromagnet (15) is arranged on the bottom wall of the decompression groove (16), the magnet (14) faces the electromagnet (15), and the projection of the magnet (14) on the decompression groove (16) is located inside the bottom wall of the decompression groove (16). The magnet (14) and the electromagnet (15) are arranged at intervals.

7. The clamping mechanism for producing thin-walled rubber products according to any one of claims 1 to 6, characterized in that: The mold locking mechanism also includes a fixed plate adjustment component, and the portion where the pull rod (6) contacts the mold locking fixed plate (2) is provided with an adjustment thread. The fixed plate adjustment component includes an adjustment lock nut (17) and a clamp (18). The adjustment lock nut (17) is located on a first side of the mold locking fixed plate (2), and the clamp (18) is located on a second side of the mold locking fixed plate (2). The adjustment lock nut (17) and the clamp (18) are both sleeved on the pull rod (6).

8. The clamping mechanism for producing thin-walled rubber products according to claim 7, characterized in that: One of the pull rods (6) corresponds to one of the adjustment lock nuts (17) and one of the clamps (18).

9. An injection molding machine for producing thin-walled rubber products, characterized in that: The injection molding machine comprises a clamping mechanism for producing thin-walled rubber products as described in any one of claims 1 to 8.

10. An injection molding method for producing thin-walled rubber products, applied to the clamping mechanism for producing thin-walled rubber products according to any one of claims 1 to 8, characterized in that: The injection molding method comprises the following steps: Step S10, installing the upper mold and the lower mold on the first sub-mold fixing plate (3) and the second sub-mold fixing plate (5) respectively; Step S20, controlling the main driving member (7) and the fine-tuning driving member (8) to simultaneously perform a pushing action until the upper mold and the lower mold are completely closed; Step S30, after the mold is closed, the main driving component (7) is controlled to maintain a predetermined first pressure value, and the fine-tuning driving component (8) is pressurized according to the feedback value of the pressure sensor (10); wherein the fine-tuning driving component (8) is maintained at a second pressure value after pressurization, and the second pressure value is 1.05 to 1.1 times the first pressure value; Step S40, after the injection molding is completed, the main driving component (7) is controlled to reduce the pressure and maintain it at a third pressure value, and the fine-tuning driving component (8) is maintained at the first pressure value, and the pressure holding time is 20 to 40 seconds; wherein the third pressure value is 0.95 to 0.98 times the first pressure value; Step S50, after the pressure holding time is over, the main driving member (7) and the fine-tuning driving member (8) are controlled to simultaneously retract the pushing action; Step S60, taking away the thin-walled rubber product after the mold is opened; Step S70, repeat steps S20 to S60 until all products are produced.

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