Locking mechanism for producing thin-walled rubber articles, injection molding machine and injection molding method

Abstract

The application relates to the technical field of thin-wall rubber product production, and discloses a mold locking mechanism for producing thin-wall rubber products, an injection molding machine and an injection molding method. The mold locking mechanism comprises a mold locking tail plate connected to an external structure; a mold locking fixed plate; a first sub-mold fixed plate arranged on the mold locking fixed plate; a mold locking movable plate slidingly arranged between the mold locking tail plate and the mold locking fixed plate; a second sub-mold fixed plate arranged on the mold locking movable plate; pull rods which sequentially pass through the mold locking tail plate, the mold locking movable plate and the mold locking fixed plate; a main driving element arranged on the mold locking tail plate and used for driving the mold locking movable plate to move; a marginal pressure fine adjustment assembly used for adjusting the pressure of the edges of a mold; and a controller electrically connected to the main driving element and the marginal pressure fine adjustment assembly. Through the technical scheme, the problem that the strength of the middle part and the edges of a product is inconsistent, thereby affecting the service life of the product, of the existing injection molding machine when producing flat thin-wall rubber products is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of thin-walled rubber product production, in particular to a mold locking mechanism for producing thin-walled rubber products, an injection molding machine and an injection molding method. BACKGROUND

[0002] Thin-walled rubber products generally refer to rubber or plastic products with relatively thin walls. Special processes and techniques are required during production to ensure the quality and performance of such products. Such products are usually processed using injection molding, in which molten material is injected into a closed mold, and after cooling and solidification, the desired product shape is formed. To ensure the quality of thin-walled rubber products, parameters such as injection temperature, pressure and cooling time need to be precisely controlled.

[0003] During the process of injecting molten material into a closed mold and cooling the material to form a product, the mold locking force needs to remain stable. If this value fluctuates, it will reduce the quality of the product. Therefore, the mold locking force needs to remain stable during this process.

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

[0005] Therefore, there is an urgent need for a new mold locking mechanism. SUMMARY

[0006] The present application proposes a mold locking mechanism for producing thin-walled rubber products, an injection molding machine and an injection molding method, which solves the problem of existing injection molding machines producing flat thin-walled rubber products, which have inconsistent strength in the middle and edges of the product, affecting the service life of the product.

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

[0008] A mold locking tail plate connected to an external structure;

[0009] A mold locking fixed plate;

[0010] A first sub-mold fixed plate provided on the mold locking fixed plate;

[0011] A mold locking moving plate slidingly arranged between the mold locking tail plate and the mold locking fixed plate;

[0012] A second sub-mold fixing plate is arranged on the movable mold plate, and the first sub-mold fixing plate and the second sub-mold fixing plate are used for mounting the mold.

[0013] A plurality of tie rods are arranged in a uniform manner, and the tie rods sequentially pass through the mold clamping tail plate, the movable mold plate and the mold clamping fixed plate, and the reciprocating sliding stroke of the movable mold plate is located in the light rod portion of the tie rod.

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

[0015] An edge pressure fine adjustment assembly includes a fine adjustment driving member, a fine adjustment pressure plate and a pressure sensor, the fine adjustment driving member is arranged on the mold clamping tail plate and has a second driving end connected to the side of the second sub-mold fixing plate after passing through the movable mold plate, the fine adjustment pressure plate is arranged on the movable mold plate, and the pressure sensor is arranged on the mold clamping fixed plate, the fine adjustment pressure plate contacts the pressure sensor after sliding with the movable mold plate.

[0016] A controller is electrically connected to the pressure sensor, the main driving member and the fine adjustment driving member.

[0017] As a further technical solution, the edge pressure fine adjustment assembly is two and symmetrically arranged.

[0018] As a further technical solution, the edge pressure fine adjustment assembly further includes a height adjustment rod, the height adjustment rod and the movable mold plate are in threaded connection, and the fine adjustment pressure plate is arranged at the end of the height adjustment rod.

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

[0020] As a further technical solution, the mold clamping mechanism further includes a middle pressure reduction assembly, the middle pressure reduction assembly includes a transition plate, the transition plate is arranged between the movable mold plate and the second sub-mold fixing plate, and a pressure reduction groove is formed in the center of the side of the transition plate towards the second sub-mold fixing plate.

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

[0022] As a further technical scheme, the lock mechanism further comprises a fixed plate adjusting assembly, the part where the pull rod contacts the lock fixed plate is provided with an adjusting thread, the fixed plate adjusting assembly comprises an adjusting lock nut and a clamp, the adjusting lock nut is located on the first side of the lock fixed plate, the clamp is located on the second side of the lock fixed plate, and the adjusting lock nut and the clamp are both sleeved on the pull rod.

[0023] As a further technical scheme, one pull rod corresponds to one adjusting lock nut and one clamp.

[0024] The working principle and beneficial effects of the mold locking mechanism for producing thin-wall rubber products provided by the application are as follows: the mold locking mechanism for producing thin-wall rubber products comprises a mold locking tail plate, a mold locking fixed plate, a mold locking movable plate, a pull rod, a main driving element, a first sub-mold fixed plate, a second sub-mold fixed plate, a marginal pressure fine adjustment assembly and a controller. The mold locking movable plate is located between the mold locking tail plate and the mold locking fixed plate, the pull rod is a plurality of and is arranged uniformly, the plurality of pull rods are connected at one end to the mold locking fixed plate and at the other end to the mold locking tail plate, the pull rod also passes through the mold locking movable plate, the main driving element is arranged on the mold locking tail plate and has a first driving end connected to the mold locking movable plate, the mold locking movable plate realizes reciprocating movement along the axial direction of the pull rod by means of the reciprocating movement of the first driving end, the stroke of the reciprocating movement of the mold locking movable plate is a smooth part on the pull rod, the first sub-mold fixed plate is arranged on the mold locking fixed plate and is used for fixing the upper mold or the lower mold, and the second sub-mold fixed plate is arranged on the mold locking movable plate and is used for fixing the lower mold or the upper mold. The marginal pressure fine adjustment assembly comprises a fine adjustment driving element, a fine adjustment pressure plate and a pressure sensor, the fine adjustment driving element is arranged on the mold locking tail plate and has a second driving end connected to the side of the second sub-mold fixed plate after passing through the mold locking movable plate, the fine adjustment pressure plate is arranged on the mold locking movable plate and moves with the mold locking movable plate, the fine adjustment pressure plate contacts the pressure sensor after the upper mold and the lower mold are completed, the pressure sensor transmits the pressure value at this time to the controller when the main driving element is no longer pressurized. Before the molten material formally enters the mold, the controller will individually pressurize the fine adjustment driving element according to the value transmitted by the pressure sensor, and the pressurizing value is 1.05-1.1 times of the pressure maintaining value of the main driving element. Since the fine adjustment driving element acts on both sides of the mold, the mold locking pressure value of the mold edge is greater than that of the mold center, thereby making the stress values at all parts of the parting surface more uniform, and finally when the molten material is injected into the mold, the consistency of the overall thickness of the product can be ensured during the cooling process of the product, and the problem that the edge thickness of the product after forming is relatively thin due to the fact that the mold edge pressure is slightly less than the mold center pressure can be avoided.

[0025] The application further provides an injection molding machine for producing thin-wall rubber products, which comprises the mold locking mechanism for producing thin-wall rubber products according to any one of the preceding claims.

[0026] The application further provides an injection molding method for producing thin-wall rubber products, which is applied to the mold locking mechanism for producing thin-wall rubber products according to any one of the preceding claims and comprises the following steps:

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

[0028] Step S20, control the main drive and the fine drive to push simultaneously until the upper die and the lower die complete the die closing;

[0029] Step S30, after the die closing, control the main drive to keep at a predetermined first pressure value, and control the fine drive to increase the pressure according to the feedback value of the pressure sensor; wherein the fine drive keeps at a second pressure value after the pressure increasing, and the second pressure value is 1.05-1.1 times of the first pressure value;

[0030] Step S40, after the injection molding is completed, control the main drive to decrease the pressure and keep at a third pressure value, keep the fine drive at the first pressure value, and the pressure keeping time is 20-40 seconds; wherein the third pressure value is 0.95-0.98 times of the first pressure value;

[0031] Step S50, after the pressure keeping time is completed, control the main drive and the fine drive to withdraw the pushing action simultaneously;

[0032] Step S60, take away the thin-wall rubber product after the die opening;

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

[0034] The injection molding method for producing the thin-wall rubber product has the following beneficial effects:

[0035] I. After the die closing, the pressure value on the die edge and the pressure value in the middle of the die are adjusted to keep the stress consistency of the product in the molding process, and then the overall thickness consistency of the product after the molding can be ensured.

[0036] II. The transition plate is arranged between the second sub-die fixed plate and the die locking moving plate, and the pressure reduction groove is reserved on the transition plate, thereby reducing the force distribution form of the main drive applied to the center of the second sub-die fixed plate, and finally reducing the part of the stress concentration on the die parting surface, and improving the uniformity of the stress distribution.

[0037] III. The stress adjustment of the die parting surface is realized by the relationship between the pressure values of the main drive and the fine drive during the pressure keeping, and the adjustment of the pressure value of the main drive during the cooling, so that the middle stress and the edge stress of the product can be kept consistent during the molding process. BRIEF DESCRIPTION OF DRAWINGS

[0038] The present application will be further described in detail below in combination with the drawings and specific embodiments.

[0039] Figure 1 The structure diagram of the die locking mechanism provided by the present application is shown in the figure;

[0040] Figure 2 The structure diagram of the die locking mechanism provided by the present application is shown in the figure;Figure 1 enlarged view of a portion of A;

[0041] Figure 3 is a top view of Figure 1

[0042] Figure 4 is a top view of Figure 3

[0043] Figure 5 is a right view of Figure 1

[0044] Figure 6 is a schematic view of the mechanism of the mold locking mechanism in the second angle in Figure 1

[0045] Figure 7 is a schematic view of the mechanism of the mold locking mechanism in the third angle in Figure 1

[0046] Figure 8 is an enlarged view of a portion of B in Figure 7

[0047] Figure 9 is a logic diagram of the injection molding method provided by the present application.

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

[0049] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor also fall within the scope of protection of the present application.

[0050] ​​​​​​In actual production, the operator found that the strength of the edge of the product was slightly less than the strength of the middle of the product after injection molding of the flat product, especially the flat rubber product was a bell-shaped shell. Although the strength difference was not large, it would also affect the quality and service life of the product. When the product fell to the ground or the product collided with other objects, the number of shell edge damage was much higher than the number of shell middle damage. In order to improve the product competitiveness and market share, the operator and the research and development personnel studied how to solve the problem that the thickness of the edge of the product was slightly lower than the thickness of the middle of the product by adjusting the temperature, pressure and cooling time. It was found in the study that by adjusting the local pressure during mold injection, the stress distribution at the parting surface of the mold was more uniform, and the stress value was more consistent, so that the overall strength of the product was more uniform. Therefore, the research and development personnel further improved the locking mechanism.

[0051] As shown in Figures 1-8 , the embodiment proposes a locking mechanism for producing a thin-walled rubber product, the locking mechanism comprising:

[0052] a locking tail plate 1 connected to an external structure;

[0053] a locking fixed plate 2;

[0054] a first sub-mold fixed plate 3 arranged on the locking fixed plate 2;

[0055] a locking movable plate 4 slidingly arranged between the locking tail plate 1 and the locking fixed plate 2;

[0056] a second sub-mold fixed plate 5 arranged on the locking movable plate 4, the first sub-mold fixed plate 3 and the second sub-mold fixed plate 5 are both used for installing a mold;

[0057] a plurality of pull rods 6 are arranged in a uniform manner, the pull rods 6 sequentially pass through the locking tail plate 1, the locking movable plate 4 and the locking fixed plate 2, and the reciprocating sliding stroke of the locking movable plate 4 is located in the light rod part of the pull rod 6;

[0058] a main driving member 7 is arranged on the 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 locking movable plate 4, and the main driving member 7 provides the reciprocating sliding power of the locking movable plate 4 and the locking force during injection molding;

[0059] a marginal pressure fine adjustment assembly, comprising a fine adjustment driving member 8, a fine adjustment pressure plate 9 and a pressure sensor 10, the fine adjustment driving member 8 is arranged on the locking tail plate 1 and has a second driving end, the second driving end is connected to the side of the second sub-mold fixed plate 5 after passing through the locking movable plate 4, the fine adjustment pressure plate 9 is arranged on the locking movable plate 4, and the pressure sensor 10 is arranged on the locking fixed plate 2, the fine adjustment pressure plate 9 contacts the pressure sensor 10 after sliding with the locking movable plate 4;

[0060] A controller is electrically connected to the pressure sensor 10, the main driving member 7 and the fine adjustment driving member 8.

[0061] In the embodiment, the mold clamping mechanism for producing the thin-walled rubber product comprises a mold clamping tail plate 1, a mold clamping fixed plate 2, a mold clamping movable plate 4, a plurality of pull rods 6, a main driving member 7, a first sub-mold fixed plate 3, a second sub-mold fixed plate 5, a marginal pressure fine adjustment assembly and a controller. The mold clamping movable plate 4 is located between the mold clamping tail plate 1 and the mold clamping fixed plate 2. The plurality of pull rods 6 are evenly arranged and connected at one end to the mold clamping fixed plate 2 and at the other end to the mold clamping tail plate 1. The pull rods 6 also pass through the mold clamping movable plate 4. The main driving member 7 is arranged on the mold clamping tail plate 1 and has a first driving end connected to the mold clamping movable plate 4. The mold clamping movable plate 4 moves along the pull rods 6 in the axial direction by reciprocating movement of the first driving end. The stroke of the reciprocating movement of the mold clamping movable plate 4 is a smooth portion on the pull rods 6. The first sub-mold fixed plate 3 is arranged on the mold clamping fixed plate 2 and is used to fix the upper mold or the lower mold. The second sub-mold fixed plate 5 is arranged on the mold clamping movable plate 4 and is used to fix the lower mold or the upper mold. The marginal pressure fine adjustment assembly comprises a fine adjustment driving member 8, a fine adjustment pressure plate 9 and a pressure sensor 10. The fine adjustment driving member 8 is arranged on the mold clamping tail plate 1 and has a second driving end connected to the side of the second sub-mold fixed plate 5 after passing through the mold clamping movable plate 4. The fine adjustment pressure plate 9 is arranged on the mold clamping movable plate 4 and moves with the mold clamping movable plate 4. After the upper mold and the lower mold are completely closed, the fine adjustment pressure plate 9 contacts the pressure sensor 10. When the main driving member 7 is no longer pressurized, the pressure sensor 10 transmits the pressure value at this time to the controller. Before the molten material formally enters the mold, the controller pressurizes the fine adjustment driving member 8 according to the value transmitted by the pressure sensor 10, and the pressurizing value is 1.05-1.1 times the holding pressure value of the main driving member 7. Since the fine adjustment driving member 8 acts on both sides of the mold, the mold clamping pressure value of the mold edge is greater than that of the mold center, thereby making the stress values at all parts of the parting surface more uniform, and ultimately when the molten material is injected into the mold, the consistency of the overall thickness of the product can be ensured during the cooling process of the product, and the problem of the product edge thickness being thinner after forming due to the mold edge pressure being slightly smaller than the mold center pressure can be avoided.

[0062] It should be particularly noted that the external structure is usually the frame of an injection molding machine, and the main driving member 7 and the fine adjustment driving member 8 are both common hydraulic cylinders. During the movement of the mold clamping movable plate 4, the main driving member 7 and the fine adjustment driving member 8 realize synchronous extension and retraction.

[0063] Further, as shown in Figures 1-7 , the embodiment proposes that the marginal pressure fine adjustment assembly is two and symmetrically arranged.

[0064] In this embodiment, in order to make the edge pressure on the mold more stable and uniform in the mold closing state, the edge pressure fine adjustment component is set in the form of two, and the two edge fine adjustment components are respectively set on both sides of the second sub-mold fixing component in a symmetrical form.

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

[0066] Furthermore, such as Figures 1-7 As shown, this embodiment proposes that the marginal pressure fine-tuning component also includes a height adjustment rod 11, which is threadedly connected to the mold locking moving plate 4, and the fine-tuning pressure plate 9 is disposed at the end of the height adjustment rod 11.

[0067] In this embodiment, the thickness of the mold is inconsistent when producing different products. Therefore, the stroke of the clamping plate 4 is also different when the mold is closed. Consequently, it is necessary to adjust the height of the fine-tuning pressure plate 9 or the pressure sensor 10. Since the height of the fine-tuning pressure plate 9 is easier to adjust, the edge pressure fine-tuning component also includes a height adjustment rod 11. The height adjustment rod 11 is set on the clamping plate 4 and is connected to the clamping plate 4 by a thread. The fine-tuning pressure plate 9 is set 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] Furthermore, such as Figures 1-7 As shown, this embodiment proposes that the marginal pressure fine-tuning component also includes a transmission plate 12, which is detachably fixed on the second sub-mold fixing plate 5, and the driving end of the fine-tuning drive component 8 is connected to the transmission plate 12.

[0069] In this embodiment, to achieve a stable connection between the fine-tuning drive component 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. The transmission plate 12 has a connection hole, and the second driving end of the fine-tuning drive component 8 passes through the connection hole, thus achieving a connection between the fine-tuning drive component 8 and the transmission plate 12. The connection between the transmission plate 12 and the second sub-mold fixing plate 5 is detachable.

[0070] Furthermore, such as Figures 3-4 As shown in the figure, this embodiment proposes that the mold-locking mechanism also includes a central pressure-reducing component. The central pressure-reducing component includes a transition plate 13, which is disposed between the mold-locking moving plate 4 and the second sub-mold fixing plate 5. A pressure-reducing groove 16 is provided on the center position of the side of the transition plate 13 facing the second sub-mold fixing plate 5.

[0071] In this embodiment, in order to further adjust the pressure of the middle part of the mold, the mold clamping mechanism further comprises a middle pressure reduction assembly, the middle pressure reduction assembly comprises a transition plate 13, the transition plate 13 is arranged between the mold clamping moving plate 4 and the second sub-mold fixed plate 5, at this time, the second sub-mold fixed plate 5 is not directly connected with the mold clamping moving plate 4, and a pressure reduction groove 16 is arranged on the center position of the side of the transition plate 13 facing the second sub-mold fixed plate 5. Since the centers of the mold and the second sub-mold fixed plate 5 coincide as much as possible in projection when the mold is installed on the second sub-mold fixed plate 5, and the center of the transition plate 13 and the center of the second sub-mold fixed plate 5 necessarily coincide in projection, therefore, due to the arrangement of the pressure reduction groove 16, the pressure received by the middle part of the second sub-mold fixed plate 5 is reduced, and then the mold clamping pressure received by the middle part of the mold is slightly lower than the mold clamping pressure received by the peripheral part, which is more conducive to keeping the overall thickness of the product after injection molding in good consistency.

[0072] It should be particularly pointed out that, in order to reduce the stress concentration phenomenon in the pressure reduction groove 16, the cross section of the pressure reduction groove 16 is arranged in a circular or elliptical shape.

[0073] Further, as shown in Figures 3-4 , the middle pressure reduction assembly further comprises a magnet 14 and an electromagnet 15, the magnet 14 is arranged on the second sub-mold fixed plate 5, the electromagnet 15 is arranged on the bottom wall of the pressure reduction groove 16, the magnet 14 faces the electromagnet 15, and the projection of the magnet 14 on the pressure reduction groove 16 is located inside the bottom wall of the pressure reduction groove 16. The magnet 14 and the electromagnet 15 are arranged in a spaced manner.

[0074] In this embodiment, in order to further reduce the stress of the middle part of the mold, the middle pressure reduction assembly further comprises a magnet 14 and an electromagnet 15, the magnet 14 is arranged on the second sub-mold fixed plate 5, the electromagnet 15 is arranged on the bottom wall of the pressure reduction groove 16, the electromagnet 15 faces the magnet 14 and the two are arranged in a spaced manner. When the electromagnet 15 is energized, an attractive force is generated between the electromagnet 15 and the magnet 14, which further reduces the stress applied by the middle part of the second sub-mold fixed plate 5 to the middle part of the mold, which is conducive to more effectively adjusting the stress at the parting surface of the mold.

[0075] Further, as shown in Figures 1-8 , the mold clamping mechanism further comprises a fixed plate adjusting assembly, an adjusting screw is arranged at the position where the pull rod 6 contacts the mold clamping fixed plate 2, the fixed plate adjusting assembly comprises an adjusting lock nut 17 and a clamp 18, the adjusting lock nut 17 is located on the first side of the mold clamping fixed plate 2, the clamp 18 is located on the second side of the mold clamping fixed plate 2, and the adjusting 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, the position of the locking plate 2 needs to be adjusted, therefore, the locking mechanism further comprises a locking plate adjusting assembly, the locking plate adjusting assembly comprises an adjusting lock nut 17 and a clamp 18, the part where the pull rod 6 is connected with the locking plate 2 is provided with a thread, the adjusting lock nut 17 and the thread part of the pull rod 6 are in threaded connection, the adjusting lock nut 17 and the clamp 18 are respectively located on the two sides of the locking plate 2, and the pull rod 6 sequentially passes through the adjusting lock, the locking tail plate 1 and the clamp 18. When adjusting the locking plate 2, first loosen the clamp 18, then separate the adjusting lock nut 17 from the pull rod 6, then rotate the adjusting lock until it is adjusted to the appropriate position, at this time, the locking plate 2 is in contact with the adjusting lock, then the clamp 18 is locked, and the cooperation of the clamp 18 and the adjusting lock completes the position adjustment of the locking plate 2.

[0077] Further, as shown in Figures 1-8 the embodiment, one pull rod 6 corresponds to one adjusting lock nut 17 and one clamp 18.

[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 adjusting lock nut 17 and one clamp 18.

[0079] The application also provides an injection molding machine for producing thin-walled rubber products, which comprises the locking mechanism for producing thin-walled rubber products according to any one of the above-mentioned embodiments. The injection molding machine comprises a control system, and there is data exchange between the control system and the controller in the locking mechanism.

[0080] The application also provides an injection molding method for producing thin-walled rubber products, which is applied to the locking mechanism for producing thin-walled rubber products according to any one of the above-mentioned embodiments, as shown in Figure 9 the embodiment, the injection molding method comprises the following steps:

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

[0082] Step S20, controlling the main driving part and the fine adjustment driving part to simultaneously perform the push-up action until the upper mold and the lower mold complete the mold closing;

[0083] Step S30, after the mold closing, controlling the main driving part to keep at a predetermined first pressure value, and controlling the fine adjustment driving part to be pressurized according to the feedback value of the pressure sensor; wherein the fine adjustment driving part keeps at a second pressure value after being pressurized, and the second pressure value is 1.05-1.1 times of the first pressure value;

[0084] Step S40, after the injection molding is completed, controlling the main driving part to be depressurized and keep at a third pressure value, and keeping the fine adjustment driving part at the first pressure value, and the pressure maintaining time is 20-40 seconds; wherein the third pressure value is 0.95-0.98 times of the first pressure value.

[0085] Step S50, after the holding pressure time ends, the main drive member and the fine adjustment drive member are controlled to simultaneously retract the pushing action;

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

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

[0088] In the control.

[0089] The injection molding method for producing thin-walled rubber products provided by the present application has the following beneficial effects:

[0090] I. 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 is consistent during the molding process, thereby ensuring the consistency of the overall thickness after the product is molded.

[0091] II. A transition plate is arranged between the second mold fixed plate and the mold locking moving plate, and a pressure reduction groove is left on the transition plate, thereby reducing the force distribution of the main drive member applied to the center of the second mold fixed plate, and ultimately reducing the part of the stress concentrated on the mold parting surface, and improving the uniformity of the stress distribution.

[0092] III. By adjusting the pressure value of the main drive member and the fine adjustment drive member during the holding pressure process, and adjusting the pressure value of the main drive member during cooling, the stress of the mold parting surface is adjusted to ensure that the stress of the middle and the edge of the product is consistent during the molding process.

[0093] The above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A locking mechanism for producing a thin-walled rubber product, characterized in that, The mold locking mechanism comprises: a mold locking tail plate (1) connected to an external structure; a mold locking fixed plate (2); a first mold fixing plate (3) arranged on the mold locking fixed plate (2); a mold locking movable plate (4) slidingly arranged between the mold locking tail plate (1) and the mold locking fixed plate (2); a second mold fixing plate (5) arranged on the mold locking movable plate (4), wherein the first mold fixing plate (3) and the second mold fixing plate (5) are both used for mounting a mold; a plurality of pull rods (6) arranged uniformly, wherein the pull rods (6) sequentially pass through the mold locking tail plate (1), the mold locking movable plate (4) and the mold locking fixed plate (2), and a reciprocating sliding stroke of the mold locking movable plate (4) is located in a polished rod portion of the pull rods (6); a main driving member (7) arranged on the mold locking tail plate (1) and having a first driving end connected to a center position of a back portion of the mold locking movable plate (4), wherein the main driving member (7) provides a reciprocating sliding power of the mold locking movable plate (4) and a mold locking force during injection molding; a marginal pressure fine adjustment assembly comprising a fine adjustment driving member (8), a fine adjustment pressure plate (9) and a pressure sensor (10), wherein the fine adjustment driving member (8) is arranged on the mold locking tail plate (1) and has a second driving end connected to a side portion of the second mold fixing plate (5) after passing through the mold locking movable plate (4), the fine adjustment pressure plate (9) is arranged on the mold locking movable plate (4), and the pressure sensor (10) is arranged on the mold locking fixed plate (2), wherein the fine adjustment pressure plate (9) contacts the pressure sensor (10) after sliding with the mold locking movable plate (4); a controller electrically connected to the pressure sensor (10), the main driving member (7) and the fine adjustment driving member (8).

2. The locking mechanism for producing a thin-walled rubber product according to claim 1, characterized by The marginal pressure fine adjustment assembly is two and symmetrically arranged.

3. The locking mechanism for producing a thin-walled rubber product according to claim 2, wherein The marginal pressure fine adjustment assembly further comprises a height adjustment rod (11) in a threaded connection manner between the height adjustment rod (11) and the mold locking movable plate (4), and the fine adjustment pressure plate (9) is arranged at an end portion of the height adjustment rod (11).

4. The locking mechanism for producing a thin-walled rubber product according to claim 3, wherein The marginal pressure fine adjustment assembly further comprises a transmission plate (12) fixed on the second mold fixing plate (5) in a detachable manner, and a driving end of the fine adjustment driving member (8) is connected to the transmission plate (12).

5. The locking mechanism for producing a thin-walled rubber product according to claim 1, wherein The mold locking mechanism further comprises a middle pressure reduction assembly, wherein the middle pressure reduction assembly comprises a transition plate (13) arranged between the mold locking movable plate (4) and the second mold fixing plate (5), and a pressure reduction groove (16) is formed in a center position of a side surface of the transition plate (13) facing the second mold fixing plate (5).

6. The locking mechanism for producing a thin-walled rubber product according to claim 5, wherein The middle pressure reducing assembly further comprises a magnet (14) and an electromagnet (15), the magnet (14) is arranged on the second sub-mold fixed plate (5), the electromagnet (15) is arranged on the bottom wall of the pressure reducing groove (16), the magnet (14) faces the electromagnet (15), the projection of the magnet (14) on the pressure reducing groove (16) is located inside the bottom wall of the pressure reducing groove (16), and the magnet (14) and the electromagnet (15) are arranged in a spaced manner.

7. The locking mechanism for producing a thin-walled rubber product according to any one of claims 1 to 6, characterized in that, The mold clamping mechanism further comprises a fixed plate adjusting assembly, an adjusting screw is arranged at a position where the pull rod (6) contacts the mold clamping fixed plate (2), the fixed plate adjusting assembly comprises an adjusting lock nut (17) and a clamp (18), the adjusting lock nut (17) is located on a first side of the mold clamping fixed plate (2), the clamp (18) is located on a second side of the mold clamping fixed plate (2), and the adjusting lock nut (17) and the clamp (18) are both sleeved on the pull rod (6).

8. The locking mechanism for producing a thin-walled rubber product according to claim 7, wherein One pull rod (6) corresponds to one adjusting lock nut (17) and one clamp (18) respectively.

9. An injection molding machine for producing thin-walled rubber articles, characterized in that The injection molding machine comprises the mold clamping mechanism for producing thin-walled rubber products according to any one of claims 1-8.

10. An injection molding method for producing a thin-walled rubber product, applied to the mold clamping mechanism for producing a thin-walled rubber product according to any one of claims 1 to 8, characterized in that, The injection molding method comprises the following steps: Step S10, installing an upper mold and a lower mold on the first sub-mold fixed plate (3) and the second sub-mold fixed plate (5) respectively; Step S20, controlling the main driving member (7) and the fine adjustment driving member (8) to simultaneously perform a push-up action until the upper mold and the lower mold are clamped; Step S30, after clamping, controlling the main driving member (7) to keep at a predetermined first pressure value, and controlling the fine adjustment driving member (8) to be pressurized according to the feedback value of the pressure sensor (10); wherein the fine adjustment driving member (8) keeps at a second pressure value after being pressurized, and the second pressure value is 1.05-1.1 times of the first pressure value; Step S40, after injection is completed, controlling the main driving member (7) to be depressurized and keep at a third pressure value, and keeping the fine adjustment driving member (8) at the first pressure value, and the pressure maintaining time is 20-40 seconds; wherein the third pressure value is 0.95-0.98 times of the first pressure value; Step S50, after the pressure maintaining time ends, controlling the main driving member (7) and the fine adjustment driving member (8) to simultaneously perform a push-up action; Step S60, taking out the thin-walled rubber product after the mold is opened; Step S70, repeating steps S20 to S60 until all products are produced. Step S60, taking out the thin-walled rubber product after the mold is opened; Step S70, repeating steps S20 to S60 until all products are produced.

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