Injection molding machine for automobile plastic parts

Abstract

The invention relates to the technical field of automobile part manufacturing, and provides an automobile plastic part injection molding machine which comprises a left mold and a right mold which are arranged in a matched mode, an exhaust groove is formed in the parting surface of the left mold so as to exhaust gas in a mold cavity during mold closing, a sliding groove communicated with the exhaust groove is formed in the parting surface of the left mold, and the exhaust groove is communicated with the sliding groove. A pressure control plate is slidably connected into the sliding groove and can move in the extending direction from the sliding groove to the exhaust groove to the mold cavity so as to gradually increase the pressure in the mold cavity. The injection mold overcomes the defects in the prior art, is reasonable in design and compact in structure, and after the mold is closed and molten raw materials are injected, the pressure control plate can be pushed into the exhaust groove, so that the pressure in the mold cavity is gradually and uniformly increased, the molten raw materials are promoted to fully flow and fill various tiny corners of the mold cavity, and meanwhile, no bubble and no defect exist in an injection molding part; and therefore, the overall quality and precision of an injection product are remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile parts manufacturing, and in particular to an automobile plastic parts injection molding machine. Background Art

[0002] Injection molding of automotive plastic parts is a process of injecting molten plastic material into a mold and forming it through cooling and solidification. This process plays an important role in the manufacturing of automotive parts, especially in the production of automotive plastic parts with complex shapes and high precision requirements.

[0003] The Chinese invention patent with application number: CN202311825545.1 discloses: an injection mold for the production of automotive parts, belonging to the field of automotive parts injection molding, including a base, the top of the base is fixedly connected to a lower mold frame, the top of the base is fixedly installed with a top seat, a cylinder is fixedly installed on the top seat, the output end of the cylinder is fixedly connected to an upper mold plate adapted to the lower mold frame, and also includes: a vibration mechanism, the vibration mechanism includes a bottom mold plate slidably installed in the lower mold frame.

[0004] The above structure realizes the flow of injection slurry through the vibration of the bottom template to avoid the problem of incomplete molding in the corners. However, the vibration of the bottom template will cause the pressure in the mold to fluctuate, thereby affecting the cooling and solidification process of the molten plastic, which may cause defects such as deformation, shrinkage holes, and cracks in the molded parts, seriously affecting the quality and appearance of the product, and resulting in the production of a large number of unqualified products. For this reason, we propose an injection molding machine for automotive plastic parts. Summary of the invention

[0005] 1. Technical issues to be solved

[0006] In view of the deficiencies of the prior art, the present invention provides an automobile plastic parts injection molding machine, which overcomes the deficiencies of the prior art, has a reasonable design and a compact structure, and solves the problem of low qualified rate of injection molded products caused by controlling the injection molding raw materials to flow into corners by vibration.

[0007] (II) Technical solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: an automobile plastic parts injection molding machine, comprising a left mold and a right mold arranged in cooperation with each other, wherein a venting groove is provided on the parting surface of the left mold to discharge the gas in the mold cavity when the mold is closed, and a slide groove connected to the venting groove is provided on the parting surface of the left mold, and a pressure control plate is slidably connected in the slide groove, and the pressure control plate can move along the slide groove in the direction in which the venting groove extends toward the mold cavity to gradually increase the pressure in the mold cavity;

[0009] The pressure control plate comprises two symmetrically arranged elastic arms, an exhaust passage is formed between the two elastic arms, protrusions are arranged on the outer walls of the two elastic arms on opposite sides, and limit blocks matching the protrusions are symmetrically arranged in the slide groove. When the pressure control plate is located in the slide groove, the limit blocks on both sides respectively abut against the protrusions of the two elastic arms, forcing the two elastic arms to approach each other and close the inlet of the exhaust passage;

[0010] A strip-shaped notch is provided at the top of the elastic arm arranged toward the outlet of the exhaust groove. When the pressure control plate is pushed into the exhaust groove, the two elastic arms elastically reset themselves without the constraint of the limit block, so that the inlet of the exhaust channel is opened, so that the gas in the mold cavity can be discharged through the exhaust channel and the strip-shaped notch.

[0011] Furthermore, the exhaust groove includes a "Z"-shaped channel and a straight channel, one end of the straight channel is connected to the "Z"-shaped channel, and the other end is connected to the mold cavity of the left mold, so that the molten raw material and excess gas injected into and filling the mold cavity of the left mold enter the "Z"-shaped channel through the straight channel, and one end of the "Z"-shaped channel away from the straight channel passes through the side wall of the left mold, so that the gas in the mold cavity is discharged through a tortuous path when the mold is closed, and the width of the straight channel is smaller than the width of the "Z"-shaped channel, so as to slow down the flow rate of the molten raw material discharged through the exhaust groove.

[0012] Furthermore, the slide groove is connected to the middle end of the "Z" shaped channel, and the connection is close to the outlet of the exhaust groove. The direction of the slide groove is the same as that of the "Z" shaped channel to ensure that the pressure control plate can slide along the slide groove into the "Z" shaped channel.

[0013] Furthermore, the slide groove includes an upper groove and a lower groove opened at the bottom of the upper groove, the limit blocks are arranged on the two side walls of the upper groove, the pressure control plate slides in the upper groove, and a sliding block is provided at the bottom thereof for sliding in the lower groove, and the sliding block is connected to the side of the lower groove close to the exhaust groove through a first support spring so that the pressure control plate remains in the slide groove when no force is applied.

[0014] Furthermore, a sleeve rod is provided on the side of the right mold away from the left mold, a push rod is sleeved inside the sleeve rod and can move along its axial direction, and the two are connected by a second supporting spring, and a cylinder is connected on the side of the push rod away from the sleeve rod to control the right mold to move toward or away from the left mold to form a mold closing or mold opening operation;

[0015] A control groove is provided on the outer wall of the sleeve rod, and the control groove includes a horizontal and vertical section consistent with the axis direction of the sleeve rod and an arc section inclined along the arc surface of the outer wall of the sleeve rod. The two have the same internal width and are connected to each other, and the horizontal and vertical sections are arranged toward the push rod. The outer wall of the push rod is provided with a convex column that matches the control groove. In the initial state, the convex column is slidably arranged in the horizontal and vertical section of the control groove. After the mold is closed, the output end of the cylinder pushes the push rod to move into the sleeve rod. At this time, the convex column slides from the horizontal and vertical section to the arc section in the control groove, so that the sleeve rod drives the right mold and the left mold to rotate synchronously.

[0016] Furthermore, the outer wall of the push rod is sleeved with a push plate that can follow its lateral movement, cross bars are arranged on both sides of the push plate, a cross groove is provided in the cross bar, a sliding plate is slidably connected in the cross groove, and the two are elastically connected by a third supporting spring, a positioning block is arranged on the side of the sliding plate away from the cross bar, the positioning block is slidably connected in the side wall of the right mold, and positioning grooves are provided on both sides of the left mold corresponding to the positioning blocks, and the push rod drives the push plate to move, so that when the positioning block is inserted into the positioning groove, the left and right molds are locked during the rotation process;

[0017] One end of the pressure control plate extends into the positioning groove, and the positioning block is provided with a slope corresponding to the tail of the pressure control plate, so that when the positioning block is inserted into the positioning groove, the slope contacts the pressure control plate and pushes it to move into the exhaust groove.

[0018] Furthermore, the side of the left mold facing away from the right mold is rotatably connected to the fixed plate on the injection molding machine body, the left mold is connected to the fixed plate by a torsion spring, and an injection channel is provided in the middle of the left mold, which is connected to the end of the injection tube, and a section of the injection tube is a hose to allow the mold to rotate after closing the mold.

[0019] Furthermore, an exhaust groove connected to the exhaust slot is opened at the mold cavity opening of the left mold, and a cutting plate is provided at intervals on one side of the exhaust groove close to the center of the mold cavity. The cutting plate is flush with the outermost side of the left mold so that the outer edge of the molding module forms a point-interrupted flash structure, and exhaust ports are formed between adjacent cutting plates to enable the gas in the mold cavity to be discharged at multiple positions at the same time.

[0020] Furthermore, the exhaust groove is arranged around the edge of the mold cavity to effectively guide the exhaust of gas from multiple positions in the mold cavity.

[0021] Furthermore, the exhaust groove is located on one side of the exhaust groove on the left mold, and its length does not exceed the length of the left mold on this side, so as to reduce the flash structure formed during injection molding.

[0022] (III) Beneficial effects

[0023] The embodiment of the present invention provides an injection molding machine for automobile plastic parts. It has the following beneficial effects:

[0024] 1. After the mold is closed and the molten raw material is injected, the pressure control plate will be pushed into the exhaust groove, so that the pressure inside the mold cavity rises gradually and evenly, which promotes the full flow and filling of the molten raw material to each tiny corner of the mold cavity, and the excess gas and possible excess raw material in the mold cavity can be smoothly discharged through the exhaust channel, effectively avoiding the problem of raw material overflow caused by excessive cavity pressure, and at the same time ensuring that there are no bubbles and defects inside the injection molded parts, thereby significantly improving the overall quality and precision of the injection molded products.

[0025] 2. After the mold is closed and pressurized, the left and right molds rotate synchronously. At this time, the molten raw materials in the mold cavity will further flow into the corners of the mold cavity, ensuring that there are no defects inside the injection molded parts, thereby further improving the overall quality and precision of the injection molded products. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention;

[0027] Figure 2 For the present invention Figure 1 A left-view stereoscopic diagram of the structure;

[0028] Figure 3 It is a three-dimensional schematic diagram of the mold cavity direction of the left mold structure of the present invention;

[0029] Figure 4 This is a three-dimensional schematic diagram of the back of the right mold structure of the present invention;

[0030] Figure 5 It is a three-dimensional schematic diagram of the pressure control plate structure of the present invention;

[0031] Figure 6 It is a sectional perspective schematic diagram of the left mold structure of the present invention;

[0032] Figure 7 It is a cross-sectional plan view of the left mold structure of the present invention;

[0033] Figure 8 It is a three-dimensional schematic diagram of the sleeve rod structure of the present invention;

[0034] Fig. 9 It is a three-dimensional schematic diagram of the crossbar structure of the present invention.

[0035] In the figure: 1. left mold; 11. exhaust groove; 121. limit block; 122. upper groove; 123. lower groove; 124. first support spring; 13. pressure control plate; 131. elastic arm; 132. exhaust channel; 133. protrusion; 134. strip notch; 135. slider; 14. positioning groove; 15. exhaust groove; 16. cutting plate; 17. exhaust port; 2. right mold; 21. sleeve rod; 211. control groove; 22. push rod; 221. boss; 222. push plate; 223. cross bar; 224. cross groove; 225. sliding plate; 226. third support spring; 227. positioning block; 228. ramp; 23. second support spring; 24. cylinder; 3. fixing plate; 4. torsion spring. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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.

[0037] See attached Figure 1-3 5. An injection molding machine for automobile plastic parts, comprising a left mold 1 and a right mold 2 which are arranged in cooperation with each other, wherein a venting groove 11 is provided on the parting surface of the left mold 1 to discharge the gas in the mold cavity when the mold is closed, and a slide groove connected to the venting groove 11 is provided on the parting surface of the left mold 1, and a pressure control plate 13 is slidably connected in the slide groove, and the pressure control plate 13 can move along the slide groove in the direction in which the venting groove 11 extends toward the mold cavity. After the mold is closed, the pressure control plate 13 is controlled to move in the venting groove 11, and at this time, the molten raw material overflowing from the venting groove 11 is pushed to gradually increase the pressure in the mold cavity, so that the molten raw material in the mold cavity fits with each corner of the mold cavity, thereby improving the molding quality;

[0038] The pressure control plate 13 includes two symmetrically arranged elastic arms 131, an exhaust channel 132 is formed between the two elastic arms 131, and the outer walls of the two elastic arms 131 on the opposite sides are provided with protrusions 133, and the chute is symmetrically provided with limit blocks 121 that match the protrusions 133. When the pressure control plate 13 is located in the chute, the limit blocks 121 on both sides respectively abut against the protrusions 133 of the two elastic arms 131, forcing the two elastic arms 131 to approach each other and close the inlet of the exhaust channel 132. When the pressure control plate 13 does not enter the exhaust groove 11, the exhaust channel 132 is closed, and the molten raw material will not enter the exhaust channel 132 at this time;

[0039] A strip-shaped notch 134 is provided at the top of the elastic arm 131 arranged close to the outlet of the exhaust groove 11. When the pressure control plate 13 is pushed into the exhaust groove 11, the two elastic arms 131 are elastically reset without the constraint of the limit block 121, so that the inlet of the exhaust channel 132 is opened, so that the gas in the mold cavity is discharged through the exhaust channel 132 and the strip-shaped notch 134. When the pressure control plate 13 enters the exhaust groove 11, the exhaust channel 132 is opened to facilitate the discharge of the gas in the mold cavity.

[0040] When in use, first control the left mold 1 and the right mold 2 to close the mold, and then inject molten raw materials into the mold cavity formed by the left mold 1 and the right mold 2. After the raw material injection is completed, control the pressure control plate 13 to enter the exhaust groove 11. As the pressure control plate 13 goes deeper, the internal pressure of the mold cavity gradually and evenly rises. This process promotes the full flow and filling of the molten raw material to each tiny corner of the mold cavity. In the process of increasing mold cavity pressure, the exhaust channel 132 is in an open state, and the excess gas in the mold cavity and possible excess raw materials can be smoothly discharged through the exhaust channel 132, effectively avoiding the problem of raw material overflow caused by excessive mold cavity pressure, while ensuring that there are no bubbles and defects inside the injection molded parts, thereby significantly improving the overall quality and precision of the injection molded products.

[0041] Furthermore, the right mold 2 is a male mold, the left mold 1 is a female mold, the injected raw material enters the female mold of the left mold 1, and the exhaust groove 11 is opened on the parting surface of the female mold to improve the efficiency and speed of exhaust.

[0042] Refer to the attached Figure 3 The exhaust groove 11 includes a "Z"-shaped channel and a straight channel. One end of the straight channel is connected to the "Z"-shaped channel, and the other end is connected to the mold cavity of the left mold 1, so that the molten raw material and excess gas injected into and filling the mold cavity of the left mold 1 enter the "Z"-shaped channel through the straight channel. The end of the "Z"-shaped channel away from the straight channel passes through the side wall of the left mold 1, so that the gas in the mold cavity is discharged through a tortuous path when the mold is closed. The width of the straight channel is smaller than the width of the "Z"-shaped channel, so as to slow down the flow rate of the molten raw material discharged through the exhaust groove 11, avoid unnecessary pressure fluctuations in the mold cavity due to excessive exhaust flow rate, affect the injection molding quality, and prevent the molten raw material flowing out of the mold cavity from being ejected, causing injuries to nearby workers, thereby achieving the effect of improving the stability of the injection molding process and the quality of the injection molded parts.

[0043] Refer to the attached Figure 3 The slide groove is connected to the middle end of the "Z"-shaped channel, and the connection is close to the outlet of the exhaust groove 11. The direction of the slide groove is the same as that of the "Z"-shaped channel to ensure that the pressure control plate 13 can slide along the slide groove into the "Z"-shaped channel to control the pressure inside the mold cavity to gradually increase.

[0044] Refer to the attached Figure 3 and Figure 6 The slide groove includes an upper groove 122 and a lower groove 123 opened at the bottom of the upper groove 122. The limit blocks 121 are arranged on the two side walls of the upper groove 122. The pressure control plate 13 slides in the upper groove 122. A slider 135 sliding in the lower groove 123 is provided at the bottom thereof. The slider 135 is connected to the side of the lower groove 123 close to the exhaust groove 11 through the first supporting spring 124, so that the pressure control plate 13 is kept in the slide groove when not under force, so as to realize the effective control of the gas discharge in the mold cavity, and the side of the slider 135 away from the first supporting spring 124 abuts against the inner wall of the lower groove 123 to prevent the pressure control plate 13 from being squeezed by the molten raw material and moving during the injection molding process.

[0045] See attached Figure 8 A sleeve rod 21 is provided on the side of the right mold 2 facing away from the left mold 1, and a push rod 22 that can move along its axial direction is sleeved inside the sleeve rod 21, and the two are elastically connected through a second supporting spring 23, and a cylinder 24 is connected to the side of the push rod 22 facing away from the sleeve rod 21 to control the right mold 2 to move toward or away from the left mold 1 to form a mold closing or mold separation operation;

[0046] A control groove 211 is provided on the outer wall of the sleeve rod 21. The control groove 211 includes a horizontal and vertical section consistent with the axial direction of the sleeve rod 21 and an arc section inclined along the arc surface of the outer wall of the sleeve rod 21. The internal widths of the two are the same and they are interconnected. The horizontal and vertical sections are arranged toward the push rod 22. The outer wall of the push rod 22 is provided with a convex column 221 that matches the control groove 211. In the initial state, the convex column 221 is slidably arranged in the horizontal and vertical section of the control groove 211. After the mold is closed, the output end of the cylinder 24 pushes the push rod 22 to move into the sleeve rod 21. At this time, the convex column 221 slides from the horizontal and vertical section to the arc section in the control groove 211, so that the sleeve rod 21 drives the right mold 2 and the left mold 1 to rotate synchronously.

[0047] When in use, the cylinder 24 is started. At this time, the push rod 22 pushes the sleeve rod 21 and the right mold 2 to move toward the left mold 1 through the second supporting spring 23. After the mold is closed, the molten raw material is injected into the mold cavity. After the injection is completed, the cylinder 24 is started again and pushes the push rod 22 to move in the direction of the right mold 2. Since the right mold 2 and the left mold 1 have completed the mold closing at this time, the right mold 2 cannot move at this time. At this time, the second supporting spring 23 is compressed, and the push rod 22 moves inside the sleeve rod 21, further making the protrusion 221 slide from the horizontal section in the control groove 211 to the arc section, so that the sleeve rod 21 drives the right mold 2 and the left mold 1 to rotate synchronously. At this time, the molten raw material in the mold cavity will further flow into the corners in the mold cavity, ensuring that there are no defects inside the injection molded parts, thereby further improving the overall quality and precision of the injection molded products.

[0048] See attached Figure 3 and Fig. 9The outer wall of the push rod 22 is sleeved with a push plate 222 that can follow its lateral movement, and the push plate 222 is rotatably connected to the outer wall of the push rod 22. Cross bars 223 are provided on both sides of the push plate 222. A cross groove 224 is provided in the cross bar 223. A sliding plate 225 is slidably connected in the cross groove 224, and the two are elastically connected by a third supporting spring 226. A positioning block 227 is provided on the side of the sliding plate 225 away from the cross bar 223. The positioning block 227 is slidably connected in the side wall of the right mold 2, and the two sides of the left mold 1 correspond to the positioning blocks. The block 227 is provided with a positioning groove 14. The push rod 22 drives the push plate 222 to move, so that when the positioning block 227 is inserted into the positioning groove 14, the left mold 1 and the right mold 2 are locked during rotation. When the push rod 22 moves toward the inside of the sleeve rod 21, the push plate 222 pushes the sliding plate 225 to move through the third support spring 226, and further moves the positioning block 227 into the positioning groove 14. At this time, the cooperation between the positioning block 227 and the positioning groove 14 makes the left mold 1 and the right mold 2 more stable during rotation.

[0049] One end of the pressure control plate 13 extends into the positioning groove 14, and the positioning block 227 is provided with a slope 228 corresponding to the tail of the pressure control plate 13, so that when the positioning block 227 is inserted into the positioning groove 14, the slope 228 contacts the pressure control plate 13 and pushes it to move into the exhaust groove 11. When the positioning block 227 is inserted into the positioning groove 14, the slope 228 pushes the pressure control plate 13 to move into the exhaust groove 11. There is no need for an external control to control the pressure control plate 13, which reduces the required control accuracy and reduces the overall cost of the equipment.

[0050] Furthermore, a guide pin is provided on the left mold 1, and a guide groove matching the guide pin is opened on the right mold 2. When the mold is closed, the guide pin is inserted into the guide groove to achieve accurate alignment of the mold and improve the stability of subsequent synchronous rotation.

[0051] Furthermore, the right mold 2 slides on multiple laterally arranged guide rods to ensure that the right mold 2 can move laterally stably. When the guide column is inserted into the guide groove during mold closing, the right mold 2 slides out from the end of the guide rod. After the mold closing is completed, the right mold 2 is separated from the guide rod to prevent the guide rod from affecting the rotation of the right mold 2.

[0052] Refer to the attached Figure 1-2 The side of the left mold 1 facing away from the right mold 2 is rotatably connected to the fixed plate 3 on the injection molding machine body. The left mold 1 is connected to the fixed plate 3 through a torsion spring 4, so that the left mold 1 can be reset under the action of the torsion spring 4 when the mold is separated, which is convenient for subsequent injection molding work.

[0053] An injection channel is provided in the middle of the left mold 1, which is connected to the end of the injection tube. A section of the injection tube is a high-temperature resistant corrugated hose to allow the mold to rotate after mold closing, ensuring that the left mold 1 and the right mold 2 can rotate synchronously, thereby improving the diversity and efficiency of mold operation.

[0054] Refer to the attached Figure 3 , 6 -7, an exhaust groove 15 connected with the exhaust groove 11 is opened in the cavity opening of the left mold 1, and a dividing plate 16 is arranged at intervals on one side of the exhaust groove 15 close to the center of the cavity. The dividing plate 16 is flush with the outermost side of the left mold 1, so that a point-interrupted flash structure is formed on the outer edge of the molded module, which is convenient for cleaning the flash structure after the injection molding is completed. Exhaust ports 17 are formed between adjacent dividing plates 16 to enable the gas in the cavity to be discharged at multiple positions at the same time, thereby increasing the gas discharge speed in the cavity and preventing the gas from being pressurized into the molten raw material during the injection molding process, thereby affecting the injection molding quality.

[0055] Refer to the attached Figure 6 In this embodiment, the exhaust groove 15 is arranged around the edge of the mold cavity to effectively guide the gas from multiple positions in the mold cavity to be discharged, thereby improving the efficiency of gas discharge.

[0056] Refer to the attached Figure 7 In another embodiment of the present application, the exhaust groove 15 is located on one side of the exhaust groove 11 on the left mold 1, and its length does not exceed the length of the left mold 1 on this side, so as to reduce the flash structure formed during injection molding. While ensuring the gas exhaust efficiency, the length of the flash is reduced to facilitate subsequent cleaning and reduce the waste of raw materials.

[0057] Working principle: the cylinder 24 is started, at this time, the push rod 22 pushes the sleeve rod 21 to move through the second support spring 23, further making the right mold 2 move toward the left mold 1 to complete the mold closing operation, and then injecting molten raw materials into the mold cavity formed by the right mold 2 and the left mold 1 through the injection tube. After the main completion, the cylinder 24 is started again. At this time, the right mold 2 and the sleeve rod 21 cannot move under the restriction of the left mold 1, so the push rod 22 will move in the sleeve rod 21. At this time, the second support spring 23 is compressed, and the convex column 221 slides in the control groove 211. In this process, the convex column 221 first moves in the horizontal and vertical sections of the control groove 211. At this time, the right mold 2 and the left mold 1 will not rotate, and the push plate 222 is supported by the third support The spring 226 pushes the sliding plate 225 to move toward the left mold 1, further causing the positioning block 227 to move into the positioning groove 14. At this time, the pressure control plate 13 will be pushed into the exhaust groove 11, further causing the internal pressure of the mold cavity to rise gradually and evenly, thereby promoting the full flow and filling of the molten raw material to each tiny corner of the mold cavity. In addition, the exhaust channel 132 is in an open state during the increase of the mold cavity pressure, and the excess gas and possible excess raw material in the mold cavity can be smoothly discharged through the exhaust channel 132, effectively avoiding the problem of raw material overflow caused by excessive cavity pressure, while ensuring that there are no bubbles or defects inside the injection molded parts, thereby significantly improving the overall quality and precision of the injection molded products.

[0058] The boss 221 continues to move, and at this time the boss 221 moves into the arc section of the control groove 211, further causing the left mold 1 and the right mold 2 to rotate synchronously. At this time, the molten raw material in the mold cavity will further flow into the corners in the mold cavity, ensuring that there are no defects inside the injection molded part, thereby further improving the overall quality and precision of the injection molded product.

[0059] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0060] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An injection molding machine for automobile plastic parts, comprising a left mold (1) and a right mold (2) arranged in cooperation with each other, wherein a venting groove (11) is provided on the parting surface of the left mold (1) to discharge the gas in the mold cavity when the mold is closed, characterized in that: A slide groove connected to the exhaust groove (11) is provided on the parting surface of the left mold (1), a pressure control plate (13) is slidably connected in the slide groove, and the pressure control plate (13) can move along the slide groove in a direction extending from the exhaust groove (11) to the mold cavity to gradually increase the pressure in the mold cavity; The pressure control plate (13) comprises two symmetrically arranged elastic arms (131), an exhaust passage (132) is formed between the two elastic arms (131), outer walls of the two elastic arms (131) on opposite sides are provided with protrusions (133), and limit blocks (121) matching the protrusions (133) are symmetrically arranged in the slide groove. When the pressure control plate (13) is located in the slide groove, the limit blocks (121) on both sides respectively abut against the protrusions (133) of the two elastic arms (131), forcing the two elastic arms (131) to approach each other and close the inlet of the exhaust passage (132); A strip-shaped notch (134) is provided at the top of the elastic arm (131) arranged close to the outlet of the exhaust groove (11); when the pressure control plate (13) is pushed into the exhaust groove (11), the two elastic arms (131) are elastically reset without the constraint of the limit block (121), so that the inlet of the exhaust channel (132) is opened, so that the gas in the mold cavity is discharged through the exhaust channel (132) and the strip-shaped notch (134).

2. The automotive plastic parts injection molding machine according to claim 1, characterized in that: The exhaust groove (11) comprises a "Z"-shaped channel and a straight-line channel, one end of the straight-line channel is connected to the "Z"-shaped channel, and the other end is connected to the mold cavity of the left mold (1), so that the molten raw material and excess gas injected into and filling the mold cavity of the left mold (1) enter the "Z"-shaped channel through the straight-line channel, and the end of the "Z"-shaped channel away from the straight-line channel penetrates the side wall of the left mold (1), so that the gas in the mold cavity is discharged through a tortuous path when the molds are closed, and the width of the straight-line channel is smaller than the width of the "Z"-shaped channel, so as to slow down the flow rate of the molten raw material discharged through the exhaust groove (11).

3. An automotive plastic parts injection molding machine as claimed in claim 2, characterized in that: The slide groove is connected to the middle end of the "Z"-shaped channel, and the connection point is close to the outlet of the exhaust groove (11). The direction of the slide groove is the same as that of the "Z"-shaped channel to ensure that the pressure control plate (13) can slide along the slide groove into the "Z"-shaped channel.

4. An automotive plastic parts injection molding machine according to any one of claims 1 to 3, characterized in that: The slide groove comprises an upper groove (122) and a lower groove (123) opened at the bottom of the upper groove (122); the limit block (121) is arranged on two side walls of the upper groove (122); the pressure control plate (13) slides in the upper groove (122); a slider (135) is provided at the bottom of the upper groove and slides in the lower groove (123); the slider (135) is connected to a side of the lower groove (123) close to the exhaust groove (11) through a first supporting spring (124) so ​​that the pressure control plate (13) remains in the slide groove when no force is applied.

5. An automotive plastic parts injection molding machine as claimed in claim 4, characterized in that: A sleeve rod (21) is provided on the side of the right mold (2) facing away from the left mold (1), a push rod (22) is sleeved inside the sleeve rod (21) and can move along its axial direction, and the two are connected via a second supporting spring (23), and a cylinder (24) is connected to the side of the push rod (22) facing away from the sleeve rod (21) to control the right mold (2) to move towards the left mold (1) or away from it, thereby forming a mold closing or mold opening operation; The outer wall of the sleeve rod (21) is provided with a control groove (211), the control groove (211) comprises a horizontal and vertical section in the same direction as the axis of the sleeve rod (21) and an arc section inclined along the arc surface of the outer wall of the sleeve rod (21), the two sections have the same internal width and are interconnected, and the horizontal and vertical section is arranged in the direction of the push rod (22), the outer wall of the push rod (22) is provided with a convex column (221) arranged to match the control groove (211), in an initial state, the convex column (221) is slidably arranged in the horizontal and vertical section of the control groove (211), after the mold is closed, the output end of the cylinder (24) pushes the push rod (22) to move into the sleeve rod (21), at which time the convex column (221) slides from the horizontal and vertical section to the arc section in the control groove (211), so that the sleeve rod (21) drives the right mold (2) and the left mold (1) to rotate synchronously.

6. An automotive plastic parts injection molding machine as claimed in claim 5, characterized in that: The outer wall of the push rod (22) is sleeved with a push plate (222) that can follow the horizontal movement thereof, and cross bars (223) are provided on both sides of the push plate (222), and a cross groove (224) is provided in the cross bar (223), and a sliding plate (225) is slidably connected in the cross groove (224), and the two are elastically connected by a third supporting spring (226), and a positioning block (227) is provided on the side of the sliding plate (225) away from the cross bar (223), and the positioning block (227) is slidably connected in the side wall of the right mold (2), and positioning grooves (14) are provided on both sides of the left mold (1) corresponding to the positioning blocks (227), and when the push rod (22) drives the push plate (222) to move, the positioning block (227) is inserted into the positioning groove (14), thereby realizing locking of the left mold (1) and the right mold (2) during rotation; One end of the pressure control plate (13) extends into the positioning groove (14), and the positioning block (227) is provided with a slope (228) corresponding to the tail of the pressure control plate (13), so that when the positioning block (227) is inserted into the positioning groove (14), the slope (228) contacts the pressure control plate (13) and pushes it to move into the exhaust groove (11).

7. An automotive plastic parts injection molding machine as claimed in claim 6, characterized in that: The side of the left mold (1) facing away from the right mold (2) is rotatably connected to a fixed plate (3) on the injection molding machine body. The left mold (1) is connected to the fixed plate (3) via a torsion spring (4). An injection channel is provided in the middle of the left mold (1). The injection channel is connected to the end of an injection tube. A section of the injection tube is a hose to allow the mold to rotate after mold closing.

8. The automobile plastic parts injection molding machine according to claim 4, characterized in that: An exhaust groove (15) connected to the exhaust groove (11) is provided at the cavity opening of the left mold (1), and a slitting plate (16) is provided at intervals on one side of the exhaust groove (15) close to the center of the cavity. The slitting plate (16) is flush with the outermost side of the left mold (1), so that the outer edge of the molded mold forms a dot-interrupted flash structure, and exhaust ports (17) are formed between adjacent slitting plates (16) to enable the gas in the cavity to be discharged at multiple locations simultaneously.

9. An automotive plastic parts injection molding machine as claimed in claim 8, characterized in that: The exhaust groove (15) is arranged around the edge of the mold cavity to effectively guide the exhaust of gas from multiple positions in the mold cavity.

10. An automobile plastic parts injection molding machine as claimed in claim 8, characterized in that: The exhaust groove (15) is located on one side of the exhaust slot (11) on the left mold (1), and its length does not exceed the length of the left mold (1) on this side, so as to reduce the flash structure formed during injection molding.

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