A secondary ejection mechanism for injection mold and injection mold

Abstract

The present invention relates to a secondary ejection mechanism for an injection mold and an injection mold, belonging to the field of injection molding equipment, comprising a base, a bottom needle plate and a surface needle plate, the upper surface of the bottom needle plate is fixedly provided with a support seat for supporting the surface needle plate, the base, the bottom needle plate and the surface needle plate are connected to each other through a lifting drive device; the lifting drive device comprises a driving rod rotatably arranged on the base, the bottom needle plate and the surface needle plate are provided with a first threaded hole and a second threaded hole for the driving rod to pass through corresponding to the driving rod, the surface through which the driving rod passes is formed with a first connecting section and a second connecting section, and the first connecting section is threadedly connected with the threaded hole on the bottom needle plate, and the second connecting section is located above the surface needle plate; the lifting drive device also comprises a receiving groove arranged on the upper surface of the base, and a supporting spring abutting against the bottom needle plate is arranged in the receiving groove. The present invention can avoid the collision and deformation of the bottom needle plate and the surface needle plate during the ejection process, and can effectively extend the service life of the ejection mechanism.

Description

Technical Field

[0001] The invention relates to the field of injection molding equipment, and in particular to a secondary ejection mechanism for an injection mold and an injection mold. Background Art

[0002] Injection molding is a method of producing industrial products. It is the main molding equipment for making plastic products of various shapes by using plastic molding molds to make thermoplastics or thermosetting materials. Injection molding is achieved through injection molding machines and molds.

[0003] In the injection molding process, for products with special shapes or due to mass production requirements, it is necessary to add another ejection action after the first ejection. This multi-stage ejection action design is called secondary ejection. The secondary ejection design can make the mold ejection action smoother. For products with a large ejection stroke, the use of secondary ejection can reduce the force exerted by the ejector on the product during ejection, avoiding defects on the product during ejection.

[0004] Among them, for the secondary ejection structure of the double ejector plate combination, it is generally necessary to use square iron as the limiting structure of one of the ejector plates. During the lifting process of the ejector plate, the square iron stops the ejector plate from moving upward, so that the other ejector plate can continue to move upward to achieve the secondary ejection operation; however, there is a hard-to-hard collision structure between the ejector plate blocking structure formed by the square iron and the ejector plate. During long-term use, the ejector plate is prone to collision and deformation, which will cause the ejector plate to be damaged and affect the entire ejection process. Correspondingly, the service life of the ejector mechanism will be shortened.

[0005] Based on this, the present invention provides a secondary ejection mechanism and an injection mold for an injection mold. By improving the secondary ejection structure of a double ejector plate combination, a head-on collision between the ejector plate and the injection mold is avoided during the secondary ejection process, thereby preventing the ejector plate from being deformed by collision during the secondary ejection process, and further achieving the purpose of extending the service life of the ejection mechanism. Summary of the invention

[0006] Based on this, the present invention provides a secondary ejection mechanism for an injection mold, comprising a base, a bottom needle plate and a face needle plate which are arranged in sequence from bottom to top, the bottom needle plate and the face needle plate being arranged horizontally, a support seat being fixedly arranged on the upper surface of the bottom needle plate, the upper surface of the support seat being abutted against the lower surface of the face needle plate for supporting the face needle plate, the base, the bottom needle plate and the face needle plate being connected to each other through a lifting drive device; the lifting drive device comprises a driving rod rotatably arranged on the base, the driving rod being arranged vertically, the bottom needle plate and the face needle plate being provided with a first threaded hole and a second threaded hole corresponding to the driving rod for the driving rod to pass through, the first threaded hole and the second threaded hole having the same tooth profile, nominal diameter, number of threads, pitch and rotation direction, the surface of the driving rod being provided with a first external thread and a second external thread corresponding to the first threaded hole and the second threaded hole for matching with the first threaded hole and the second threaded hole, the first external thread and the second external thread protruding from the surface of the driving rod, A first connecting section and a second connecting section are formed, the first connecting section is threadedly connected to the threaded hole on the bottom needle plate through the first external thread thereon, the second connecting section is located above the surface needle plate, and the distance between the top end of the first connecting section and the bottom end of the second connecting section is smaller than the distance between the lower surface of the bottom needle plate and the upper surface of the surface needle plate, preferably, the distance between the top end of the first connecting section and the bottom end of the second connecting section is not less than 90% of the distance between the lower surface of the bottom needle plate and the upper surface of the surface needle plate; the lifting drive device also includes a receiving groove opened on the upper surface of the base, a supporting spring is arranged in the receiving groove, and the upper end of the supporting spring abuts against the lower surface of the bottom needle plate and is in a compressed state; a plurality of first ejectors are fixedly arranged on the bottom needle plate, and the first ejectors are vertically arranged; the surface needle plate is provided with a through hole for the first ejector to pass through, and the top end of the first ejector passes through the through hole and extends to the top of the surface needle plate, and a plurality of second ejectors are fixedly arranged on the surface needle plate, and the second ejectors are vertically arranged.

[0007] In the present invention, the secondary ejection mechanism is used to be installed in the injection mold and used to eject the product from the cavity of the injection mold after the injection molding is completed.

[0008] In the present invention, the driving rod can be rotatably mounted on the base through a bearing structure, and the bottom needle plate and the ejector plate can be driven to move up and down by the rotation of the driving rod, thereby driving the first ejector and the second ejector fixed on the bottom needle plate and the ejector plate to move up and down, realizing the ejection operation of the secondary ejection mechanism, and realizing the reset of the secondary ejection mechanism. Among them, since the first external thread and the second external thread protrude from the surface of the driving rod, the outer diameter of the driving rod will be smaller than the outer diameter of the first connecting section and the second connecting section, and accordingly, the outer diameter of the driving rod will be smaller than the inner diameter of the first threaded hole and the second threaded hole. After the first threaded hole and the second threaded hole leave the first connecting section and the second connecting section, the bottom needle plate and the surface needle plate can move up and down freely relative to the driving rod.

[0009] In the present invention, the ejection working process of the secondary ejection mechanism is as follows:

[0010] Ejection process:

[0011] The driving rod rotates, and the bottom needle plate threadedly connected to the first connecting section of the driving rod is driven up by the first connecting section. During this process, the bottom needle plate also drives the surface needle plate to rise until the first threaded hole of the bottom needle plate leaves the first connecting section, completing a lifting operation;

[0012] Among them, since the distance between the top end of the first connecting segment and the bottom end of the second connecting segment is smaller than the distance between the lower surface of the bottom needle plate and the upper surface of the surface needle plate, the second threaded hole of the surface needle plate will be screwed onto the second connecting segment before the first threaded hole of the bottom needle plate leaves the first connecting segment.

[0013] As the driving rod continues to rotate, the face needle plate will continue to be lifted by the rotating second connecting section until the face needle plate is lifted to a preset position, completing the secondary lifting operation;

[0014] In the process that the surface needle plate is driven to be lifted by the second connecting section, the bottom needle plate that leaves the first connecting section is lifted by a certain distance by the supporting spring abutting thereon, so that the first threaded hole of the bottom needle plate leaves the contact with the first connecting section;

[0015] Among them, after the bottom needle plate leaves the first connecting section, during the process of the support spring lifting the bottom needle plate, the elastic force of the support spring acting on the bottom needle plate can also serve the purpose of supporting the surface needle plate, that is, when the surface needle plate just begins to be screwed into the second connecting section, the support spring can also achieve the unexpected technical effect of lifting the surface needle plate, that is, the support spring can assist the second external thread of the second connecting section to support the surface needle plate when there are fewer threads that engage with each other between the surface needle plate and the second connecting section, thereby reducing the force acting on the external thread of the second threaded section and protecting the external thread on the second connecting section.

[0016] Reset process:

[0017] The driving rod rotates in the opposite direction, and the surface needle plate connected to the second connecting section of the driving rod is driven downward by the second connecting section. When the surface needle plate abuts against the support seat, the surface needle plate will press down the bottom needle plate, so that the bottom needle plate is rotated back to the first connecting section and moves downward with the rotation of the first connecting section. When the bottom needle plate moves down to the initial position, the resetting operation is completed.

[0018] In the process of the driving rod rotating in the reverse direction, the second threaded hole of the surface needle plate will be disengaged from the second connecting section and will abut against the support seat, and will move downward along with the downward movement of the bottom needle plate.

[0019] In the present invention, during the ejection operation of the secondary ejection mechanism, the lifting and lowering actions of the bottom needle plate and the surface needle plate are driven by the first connecting section and the second connecting section on the driving rod, and there is no hard collision between the structures during this process. Therefore, the present invention can effectively avoid the collision and deformation of the bottom needle plate and the surface needle plate during the ejection operation, thereby achieving the purpose of extending the service life of the ejection mechanism.

[0020] In addition, in the present invention, due to the existence of factors such as processing errors, during the lifting process of the bottom needle plate and the surface needle plate, when the second threaded hole of the surface needle plate is just screwed onto the second connecting section, the bottom needle plate and the surface needle plate may have a small relative displacement. Therefore, the present invention can set the middle section of the support seat to be a flexible material with elasticity to avoid the relative displacement of the bottom needle plate and the surface needle plate from squeezing the bottom needle plate and the surface needle plate. Since the relative displacement of the bottom needle plate and the surface needle plate may be very small, the thickness of the flexible material only needs to be very small, for example, 0.2-0. 4mm thick rubber material is used to cope with the relative displacement of the bottom needle plate and the surface needle plate, and the thickness of flexible material will not affect the ejection operation of the second ejector; at the same time, on this basis, in order to improve the stability of the surface needle plate when it is in the initial position, after the secondary ejection mechanism is installed in the injection mold, a support block can be fixed on the square iron, and the upper surface of the support block can be abutted against the lower surface of the surface needle plate, thereby supporting the surface needle plate and improving its stability. It is worth noting that if a support block is set on the square iron, it is necessary to open an air avoidance groove on the bottom needle plate to avoid the support block.

[0021] Furthermore, the lower surface of the bottom needle plate is attached to the upper surface of the base.

[0022] In the present invention, when the bottom needle plate is in the initial position, the lower surface of the bottom needle plate is attached to the upper surface of the base. Therefore, the existence of the base can also support the bottom needle plate. Correspondingly, the base can also support the opposite needle plate through the support seat on the bottom needle plate. Therefore, the present invention can effectively ensure the structural stability of the entire secondary ejection mechanism in the initial state.

[0023] Further, the diameter of the via hole is the same as that of the first ejector pin passing through the via hole, and the via hole and the first ejector pin passing through the via hole are arranged in a sliding fit.

[0024] In the present invention, the diameter of the through hole is the same as that of the first ejector pin passing through it, and the through hole and the first ejector pin passing through it are slidably matched. Therefore, the through hole on the surface needle plate can support the first ejector pin on the bottom needle plate, which can effectively improve the structural strength and stability of the first ejector pin during operation and improve its load-bearing capacity.

[0025] Furthermore, a sleeve is provided on the upper surface of the needle plate corresponding to the through hole, the inner side wall of the sleeve is flush with the corresponding through hole, and the sleeve is slidably matched with the first ejector pin passing through the corresponding through hole.

[0026] In the present invention, the inner side wall of the sleeve is flush with its corresponding through hole, so the first ejector pin passing through the through hole will also pass through the sleeve. At this time, since the inner side wall of the sleeve and the first ejector pin are slidably matched, the sleeve and the through hole can jointly support the first ejector pin, which can further improve the structural strength of the first ejector pin during operation.

[0027] In addition, the present invention also provides an injection mold, comprising a bottom plate, a B plate, an A plate and a panel arranged in sequence from bottom to top, the bottom plate and the B plate are fixedly connected to each other by square irons, and an installation space is formed between the bottom plate and the B plate, the A plate and the panel are fixedly connected to each other, a front mold core is embedded in the lower surface of the A plate, a rear mold core matching the front mold core is embedded in the upper surface of the B plate, a cavity is enclosed between the front mold core and the rear mold core, and the above-mentioned secondary ejection mechanism for the injection mold is installed in the installation space.

[0028] In the present invention, the cavity is used for curing and molding of the product. After the product is cured and molded, the cavity can be opened by moving down the bottom plate and the B plate. At this time, the ejection operation of the secondary ejection mechanism installed in the installation space can eject the product from the cavity.

[0029] Furthermore, a plurality of guide posts are fixedly arranged between the B plate and the base plate, the guide posts are arranged vertically, the bottom needle plate and the surface needle plate are provided with mounting holes corresponding to the guide posts and slidably matched with the guide posts, and are installed on the guide posts through their mounting holes; a mounting groove is provided on the base plate, the base is fixedly installed in the mounting groove, and a through hole is provided at the bottom of the mounting groove, which passes through the base plate, and the bottom end of the driving rod passes downward through the through hole and extends to the bottom of the base plate, and a driving device is also provided on the lower surface of the base plate, and the driving device is drivingly connected to the driving rod extending to the bottom of the base plate to drive the driving rod to rotate around its own axis; a first guide hole and a second guide hole are vertically provided on the B plate and pass through it, the first guide hole and the second guide hole are connected to the cavity setting, and the first ejector pin and the second ejector pin respectively pass through the first guide hole and the second guide hole and extend to the top of the first guide hole and the second guide hole.

[0030] In the present invention, when the secondary ejection mechanism is installed in the installation space, its base is installed in the bottom plate. Preferably, the upper surface of the base is flush with the upper surface of the bottom plate, and its bottom needle plate and ejector needle plate are slidably installed on the guide column through the mounting holes thereon, thereby completing the installation of the secondary ejection mechanism.

[0031] In the present invention, the bottom needle plate and the ejector plate can freely move up and down along the guide column when driven by the driving rod, so that the first ejector pin and the second ejector pin can move up and down in the first guide hole and the second guide hole, so as to complete the ejection operation of the first ejector pin and the second ejector pin on the product; wherein, the bottom end line of the driving rod extends downward to the bottom of the bottom plate, and is driven to rotate by a driving device installed on the lower surface of the bottom plate, and preferably, the driving rod is connected to the through hole through a bearing structure.

[0032] Furthermore, a receiving hole for receiving the sleeve is provided on the lower surface of the B plate corresponding to the sleeve.

[0033] In the present invention, the receiving hole provided on the lower surface of the B plate is used to receive the sleeve on the face needle plate when the face needle plate is lifted.

[0034] Furthermore, the driving device includes a driving motor fixedly arranged on the lower surface of the base plate, a first bevel gear is fixedly arranged at the power output end of the driving motor, a second bevel gear matching with the first bevel gear is fixedly arranged at the bottom end of the driving rod corresponding to the first bevel gear, and the second bevel gear is meshed with the first bevel gear.

[0035] In the present invention, the meshing structure of the first bevel gear and the second bevel gear can transmit the power of the driving motor to the driving rod, so that the driving rod rotates around its own axis, thereby realizing the driving of the bottom needle plate and the surface needle plate.

[0036] Furthermore, position sensors for detecting the positions of the bottom needle plate and the surface needle plate are also provided on the square iron corresponding to the bottom needle plate and the surface needle plate.

[0037] In the present invention, the position sensor may be an optical position sensor or an ultrasonic position sensor, which is used to monitor the positions of the bottom needle plate and the surface needle plate in real time, thereby conveniently controlling the moving distance of the bottom needle plate and the surface needle plate during the lifting process.

[0038] Furthermore, a mounting seat is provided on the lower surface of the B plate, and the top end of the driving rod is rotatably mounted on the mounting seat.

[0039] In the present invention, the top end of the driving rod can also be rotatably mounted on the mounting seat of the B plate, which can effectively enhance the structural stability of the driving rod and ensure the directional accuracy of the bottom needle plate and the surface needle plate during the up and down movement process.

[0040] The principle and effect of the present invention are further described below in combination with the above technical solutions and the accompanying drawings:

[0041] In the present invention, during the ejection operation of the secondary ejection mechanism, the lifting and lowering actions of the bottom needle plate and the surface needle plate are driven by the first connecting section and the second connecting section on the driving rod, and there is no hard collision between the structures during this process. Therefore, the present invention can effectively avoid the collision and deformation of the bottom needle plate and the surface needle plate during the ejection operation, thereby achieving the purpose of extending the service life of the ejection mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic cross-sectional structure diagram of a secondary ejection mechanism for an injection mold according to an embodiment of the present invention;

[0043] Figure 2 It is a schematic cross-sectional structure diagram of the secondary ejection mechanism for an injection mold during primary ejection according to an embodiment of the present invention;

[0044] Figure 3 It is a schematic cross-sectional structure diagram of the secondary ejection mechanism for an injection mold during secondary ejection according to an embodiment of the present invention;

[0045] Figure 4 Schematic diagram of the cross-sectional structure of the injection mold according to an embodiment of the present invention;

[0046] Figure 5 It is a schematic cross-sectional structure diagram of the injection mold according to an embodiment of the present invention during primary ejection by a secondary ejection mechanism;

[0047] Figure 6 It is a schematic diagram of the cross-sectional structure of the injection mold according to an embodiment of the present invention during secondary ejection by the secondary ejection mechanism.

[0048] Reference numerals

[0049] 11-base, 111-accommodating groove, 112-support spring, 12-bottom needle plate, 121-first ejector pin, 122-support seat, 13-face needle plate, 131-second ejector pin, 132-sleeve, 14-driving rod, 141-first connecting section, 142-second connecting section, 143-second bevel gear, 21-bottom plate, 22-B plate, 221-accommodating hole, 222-mounting seat, 23-A plate, 24-panel, 25-square iron, 3-driving motor, 31-first bevel gear, 4-product. DETAILED DESCRIPTION

[0050] In order to facilitate understanding by those skilled in the art, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0051] like Figure 1-6A secondary ejection mechanism for an injection mold and an injection mold, comprising a base 11, a bottom needle plate 12 and a surface needle plate 13 arranged in sequence from bottom to top, the bottom needle plate 12 and the surface needle plate 13 are arranged horizontally, a support seat 122 is fixedly arranged on the upper surface of the bottom needle plate 12, the upper surface of the support seat 122 abuts against the lower surface of the surface needle plate 13 to support the surface needle plate 13, the base 11, the bottom needle plate 12 and the surface needle plate 13 are connected to each other through a lifting drive device; the lifting drive device includes a driving rod 14 rotatably arranged on the base 11, and the driving rod 14 is vertically The bottom needle plate 12 and the surface needle plate 13 are provided with a first threaded hole and a second threaded hole corresponding to the driving rod 14 for the driving rod 14 to pass through, the first threaded hole and the second threaded hole have the same thread type, nominal diameter, number of threads, pitch and direction of rotation, and the surface of the driving rod 14 is provided with a first external thread and a second external thread corresponding to the first threaded hole and the second threaded hole for matching with the first threaded hole and the second threaded hole, the first external thread and the second external thread protrude from the surface of the driving rod 14, and a first connecting section 141 and a second connecting section 14 are formed on the driving rod 14. 42, the first connecting section 141 is threadedly connected to the threaded hole on the bottom needle plate 12 through the first external thread thereon, the second connecting section 142 is located above the surface needle plate 13, and the distance between the top end of the first connecting section 141 and the bottom end of the second connecting section 142 is smaller than the distance between the lower surface of the bottom needle plate 12 and the upper surface of the surface needle plate 13, preferably, the distance between the top end of the first connecting section 141 and the bottom end of the second connecting section 142 is not less than 90% of the distance between the lower surface of the bottom needle plate 12 and the upper surface of the surface needle plate 13; the lifting drive device also It includes a receiving groove 111 opened on the upper surface of the base 11, and a supporting spring 112 is arranged in the receiving groove 111. The upper end of the supporting spring 112 abuts against the lower surface of the bottom needle plate 12 and is in a compressed state; a plurality of first ejector pins 121 are fixedly arranged on the bottom needle plate 12, and the first ejector pins 121 are vertically arranged. The surface needle plate 13 is provided with a through hole for the first ejector pin 121 to pass through, and the top of the first ejector pin 121 passes through the through hole and extends to the top of the surface needle plate 13, and a plurality of second ejector pins 131 are fixedly arranged on the surface needle plate 13, and the second ejector pins 131 are vertically arranged.

[0052] In the present invention, the secondary ejection mechanism is used to be installed in the injection mold and used to eject the product 4 from the cavity of the injection mold after the injection molding is completed.

[0053] In the present invention, the driving rod 14 can be rotatably mounted on the base 11 through a bearing structure, and the bottom needle plate 12 and the ejector plate can be driven to move up and down by the rotation of the driving rod 14, thereby driving the first ejector 121 and the second ejector 131 fixed on the bottom needle plate 12 and the ejector plate to move up and down, thereby realizing the ejection operation of the secondary ejection mechanism and the reset of the secondary ejection mechanism. Among them, since the first external thread and the second external thread protrude from the surface of the driving rod 14, the outer diameter of the driving rod 14 will be smaller than the outer diameter of the first connecting section 141 and the second connecting section 142, and accordingly, the outer diameter of the driving rod 14 will be smaller than the inner diameter of the first threaded hole and the second threaded hole. After the first threaded hole and the second threaded hole leave the first connecting section 141 and the second connecting section 142, the bottom needle plate 12 and the surface needle plate 13 can freely move up and down relative to the driving rod 14.

[0054] In the present invention, the ejection working process of the secondary ejection mechanism is as follows:

[0055] Ejection process:

[0056] (1) The driving rod 14 rotates, and the bottom needle plate 12 threadedly connected to the first connecting section 141 of the driving rod 14 is driven to rise by the first connecting section 141. During this process, the bottom needle plate 12 also drives the surface needle plate 13 to rise until the first threaded hole of the bottom needle plate 12 leaves the first connecting section 141, completing a lifting operation;

[0057] Among them, since the distance between the top end of the first connecting segment 141 and the bottom end of the second connecting segment 142 is smaller than the distance between the lower surface of the bottom needle plate 12 and the upper surface of the surface needle plate 13, the second threaded hole of the surface needle plate 13 will be screwed onto the second connecting segment 142 before the first threaded hole of the bottom needle plate 12 leaves the first connecting segment 141.

[0058] (2) As the driving rod 14 continues to rotate, the face needle plate 13 will continue to be lifted by the rotating second connecting section 142 until the face needle plate 13 is lifted to a preset position, completing the secondary lifting operation;

[0059] When the surface needle plate 13 is driven to be lifted by the second connecting section 142, the bottom needle plate 12 which leaves the first connecting section 141 is lifted by the supporting spring 112 abutting thereon for a certain distance, so that the first threaded hole of the bottom needle plate 12 leaves the contact with the first connecting section 141.

[0060] Among them, after the bottom needle plate 12 leaves the first connecting section 141, during the process of the support spring 112 lifting the bottom needle plate 12, the elastic force of the support spring 112 acting on the bottom needle plate 12 can also serve the purpose of supporting the surface needle plate 13, that is, when the surface needle plate 13 just begins to be screwed into the second connecting section 142, the support spring 112 can also achieve the unexpected technical effect of lifting the surface needle plate 13, that is, the support spring 112 can assist the second external thread of the second connecting section 142 to support the surface needle plate 13 when there are fewer threads that engage with each other between the surface needle plate 13 and the second connecting section 142, which can reduce the force acting on the external thread of the second threaded section and protect the external thread on the second connecting section 142.

[0061] Reset process:

[0062] (1) The driving rod 14 rotates in the opposite direction, and the face needle plate 13 connected to the second connecting section 142 of the driving rod 14 is driven downward by the second connecting section 142. When the face needle plate 13 abuts against the support seat 122, the face needle plate 13 presses down the bottom needle plate 12, so that the bottom needle plate 12 is rotated back to the first connecting section 141 and moves downward with the rotation of the first connecting section 141. When the bottom needle plate 12 moves down to the initial position, the reset operation is completed.

[0063] When the driving rod 14 rotates in the reverse direction, the second threaded hole of the surface needle plate 13 is separated from the second connecting section 142 and abuts against the supporting seat 122 , and moves downward along with the downward movement of the bottom needle plate 12 .

[0064] In the present invention, during the ejection operation of the secondary ejection mechanism, the lifting and lowering actions of the bottom needle plate 12 and the surface needle plate 13 are driven by the first connecting section 141 and the second connecting section 142 on the driving rod 14, and there is no hard collision between the structures during this process. Therefore, the present invention can effectively avoid the collision and deformation of the bottom needle plate 12 and the surface needle plate 13 during the ejection operation, thereby achieving the purpose of extending the service life of the ejection mechanism.

[0065] In addition, in the present invention, due to the existence of factors such as processing errors, during the lifting process of the bottom needle plate 12 and the surface needle plate 13, when the second threaded hole of the surface needle plate 13 is just screwed onto the second connecting section 142, the bottom needle plate 12 and the surface needle plate 13 may have a small relative displacement. Therefore, the present invention can set the middle section of the support seat 122 to be an elastic flexible material to avoid the relative displacement of the bottom needle plate 12 and the surface needle plate 13 causing compression of the bottom needle plate 12 and the surface needle plate 13. Among them, since the relative displacement of the bottom needle plate 12 and the surface needle plate 13 may be very small, the flexible material only needs to have a very small thickness, for example, 0. 2-0.4mm thick rubber material is used to cope with the relative displacement of the bottom needle plate 12 and the surface needle plate 13, and the flexible material of this thickness will not affect the ejection operation of the second ejector 131; at the same time, on this basis, in order to improve the stability of the surface needle plate 13 when it is in the initial position, after the secondary ejection mechanism is installed in the injection mold, a support block can be fixed on the square iron 25, and the upper surface of the support block is abutted against the lower surface of the surface needle plate 13, thereby supporting the surface needle plate 13 and improving its stability. It is worth noting that if a support block is set on the square iron 25, it is necessary to open an air avoidance groove on the bottom needle plate 12 to avoid the support block.

[0066] In one embodiment, the lower surface of the bottom needle plate 12 is in contact with the upper surface of the base 11 .

[0067] In the present embodiment, when the bottom needle plate 12 is in the initial position, the lower surface of the bottom needle plate 12 is attached to the upper surface of the base 11. Therefore, the existence of the base 11 can also support the bottom needle plate 12. Correspondingly, the base 11 can also support the opposite needle plate 13 through the support seat 122 on the bottom needle plate 12. Therefore, the present invention can effectively ensure the structural stability of the entire secondary ejection mechanism in the initial state.

[0068] In one embodiment, the diameter of the via hole is the same as that of the first ejector pin 121 passing through the via hole, and the via hole and the first ejector pin 121 passing through the via hole are slidably matched.

[0069] In this embodiment, the diameter of the through hole is the same as that of the first ejector pin 121 passing through it, and the through hole and the first ejector pin 121 passing through it are slidably matched. Therefore, the through hole on the surface needle plate 13 can support the first ejector pin 121 on the bottom needle plate 12, which can effectively improve the structural strength and stability of the first ejector pin 121 during operation and improve its load-bearing capacity.

[0070] In one embodiment, a sleeve 132 is further provided on the upper surface of the needle plate 13 corresponding to the through hole, the inner side wall of the sleeve 132 is flush with the corresponding through hole, and the sleeve 132 is slidably matched with the first ejector pin 121 passing through the corresponding through hole.

[0071] In this embodiment, the inner wall of the sleeve 132 is flush with the corresponding through hole. Therefore, the first ejector pin 121 passing through the through hole will also pass through the sleeve 132. At this time, since the inner wall of the sleeve 132 and the first ejector pin 121 are slidably matched, the sleeve 132 and the through hole can jointly support the first ejector pin 121, which can further improve the structural strength of the first ejector pin 121 during operation.

[0072] In addition, the present invention also provides an injection mold, including a bottom plate 21, a B plate 22, an A plate 23 and a panel 24 arranged in sequence from bottom to top, the bottom plate 21 and the B plate 22 are fixedly connected to each other by a square iron 25, and an installation space is formed between the bottom plate 21 and the B plate 22, the A plate 23 and the panel 24 are fixedly connected to each other, a front mold core is embedded in the lower surface of the A plate 23, and a rear mold core matching the front mold core is embedded in the upper surface of the B plate 22, the front mold core and the rear mold core enclose a cavity, and the above-mentioned secondary ejection mechanism for the injection mold is installed in the installation space.

[0073] In the present invention, the cavity is used for curing and molding of product 4. After curing and molding of product 4, the cavity can be opened by moving down the bottom plate 21 and the B plate 22. At this time, the ejection operation of the secondary ejection mechanism installed in the installation space can eject the product 4 from the cavity.

[0074] In one embodiment, a plurality of guide posts are fixedly arranged between the B plate 22 and the bottom plate 21, the guide posts are arranged vertically, the bottom needle plate 12 and the surface needle plate 13 are provided with mounting holes corresponding to the guide posts and slidingly matched with the guide posts, and are installed on the guide posts through their mounting holes; a mounting groove is provided on the bottom plate 21, the base 11 is fixedly installed in the mounting groove, and a through hole is provided at the bottom of the mounting groove, which passes through the bottom plate 21, the bottom end of the driving rod 14 passes downward through the through hole and extends to the bottom of the bottom plate 21, and a driving device is also provided on the lower surface of the bottom plate 21, the driving device is connected to the driving rod 14 extending to the bottom of the bottom plate 21, and is used to drive the driving rod 14 to rotate around its own axis; a first guide hole and a second guide hole are vertically provided on the B plate 22, and the first guide hole and the second guide hole are connected to the cavity setting, and the first ejector pin 121 and the second ejector pin 131 respectively pass through the first guide hole and the second guide hole and extend to the top of the first guide hole and the second guide hole.

[0075] In this embodiment, when the secondary ejection mechanism is installed in the installation space, its base 11 is installed in the bottom plate 21. Preferably, the upper surface of the base 11 is flush with the upper surface of the bottom plate 21, and its bottom needle plate 12 and ejector plate are slidably installed on the guide column through the mounting holes thereon, thereby completing the installation of the secondary ejection mechanism.

[0076] In this embodiment, the bottom needle plate 12 and the ejector plate can move freely up and down along the guide column when driven by the driving rod 14, so that the first ejector pin 121 and the second ejector pin 131 can move up and down in the first guide hole and the second guide hole, so as to complete the ejection operation of the first ejector pin 121 and the second ejector pin 131 for the product 4; wherein, the bottom end line of the driving rod 14 extends downward to the bottom of the bottom plate 21, and is driven to rotate by a driving device installed on the lower surface of the bottom plate 21, and preferably, the driving rod 14 is connected to the through hole through a bearing structure.

[0077] In one embodiment, a receiving hole 221 for receiving the sleeve 132 is provided on the lower surface of the B plate 22 corresponding to the sleeve 132 .

[0078] In this embodiment, the receiving hole 221 formed on the lower surface of the B plate 22 is used to receive the sleeve 132 on the face needle plate 13 when the face needle plate 13 is lifted.

[0079] In one embodiment, the driving device includes a driving motor 3 fixedly arranged on the lower surface of the base plate 21, a first bevel gear 31 is fixedly arranged at the power output end of the driving motor 3, a second bevel gear 143 cooperating with the first bevel gear 31 is fixedly arranged at the bottom end of the driving rod 14 corresponding to the first bevel gear 31, and the second bevel gear 143 is meshed with the first bevel gear 31.

[0080] In this embodiment, the meshing structure of the first bevel gear 31 and the second bevel gear 143 can transmit the power of the drive motor 3 to the drive rod 14, so that the drive rod 14 rotates around its own axis, thereby driving the bottom needle plate 12 and the surface needle plate 13.

[0081] In one embodiment, position sensors for detecting the positions of the bottom needle plate 12 and the surface needle plate 13 are further provided on the square iron 25 corresponding to the bottom needle plate 12 and the surface needle plate 13 .

[0082] In this embodiment, the position sensor can be an optical position sensor or an ultrasonic position sensor, which is used to monitor the positions of the bottom needle plate 12 and the surface needle plate 13 in real time, so as to facilitate the control of the moving distance of the bottom needle plate 12 and the surface needle plate 13 during the lifting process.

[0083] In one embodiment, a mounting seat 222 is further provided on the lower surface of the B plate 22 , and the top end of the driving rod 14 is rotatably mounted on the mounting seat 222 .

[0084] In this embodiment, the top end of the driving rod 14 can also be rotatably mounted on the mounting seat 222 of the B plate 22, which can effectively enhance the structural stability of the driving rod 14 and ensure the directional accuracy of the bottom needle plate 12 and the surface needle plate 13 during the up and down movement process.

[0085] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A secondary ejection mechanism for an injection mold, characterized in that: The invention comprises a base, a bottom needle plate and a surface needle plate which are arranged in sequence from bottom to top, the bottom needle plate and the surface needle plate being arranged horizontally, a support seat being fixedly arranged on the upper surface of the bottom needle plate, the upper surface of the support seat being abutted against the lower surface of the surface needle plate for supporting the surface needle plate, the base, the bottom needle plate and the surface needle plate being connected to each other through a lifting drive device; the lifting drive device comprises a driving rod rotatably arranged on the base, the driving rod being arranged vertically, the bottom needle plate and the surface needle plate being provided with a first threaded hole and a second threaded hole corresponding to the driving rod for the driving rod to pass through, the surface of the driving rod being provided with a first external thread and a second external thread corresponding to the first threaded hole and the second threaded hole for matching with the first threaded hole and the second threaded hole, the first external thread and the second external thread protruding from the surface of the driving rod, and a The cam is a vertical cam which is provided with a first threaded connection to the top of the base and a second threaded connection to the bottom of the base.

2. A secondary ejection mechanism for an injection mold according to claim 1, characterized in that: The lower surface of the bottom needle plate is attached to the upper surface of the base.

3. A secondary ejection mechanism for an injection mold according to claim 1, characterized in that: The diameter of the through hole is the same as that of the first ejector pin passing through the through hole, and the through hole and the first ejector pin passing through the through hole are arranged in a sliding cooperation.

4. A secondary ejection mechanism for an injection mold according to claim 3, characterized in that: A sleeve is further provided on the upper surface of the needle plate corresponding to the through hole, the inner side wall of the sleeve is flush with the corresponding through hole, and the sleeve is slidably matched with the first ejector pin passing through the corresponding through hole.

5. An injection mold, comprising a bottom plate, a B plate, an A plate and a panel arranged in sequence from bottom to top, wherein the bottom plate and the B plate are fixedly connected to each other through square irons, and an installation space is formed between the bottom plate and the B plate, the A plate and the panel are fixedly connected to each other, a front mold core is embedded in the lower surface of the A plate, a rear mold core matched with the front mold core is embedded in the upper surface of the B plate, and a cavity is enclosed between the front mold core and the rear mold core, characterized in that: The secondary ejection mechanism for the injection mold as claimed in claim 4 is installed in the installation space.

6. An injection mold according to claim 5, characterized in that: A plurality of guide posts are fixedly arranged between the B plate and the base plate, the guide posts are arranged vertically, the bottom needle plate and the surface needle plate are provided with mounting holes corresponding to the guide posts and slidably matched with the guide posts, and are installed on the guide posts through their mounting holes; a mounting groove is provided on the base plate, the base is fixedly installed in the mounting groove, and a through hole is provided at the bottom of the mounting groove, which passes through the base plate, the bottom end of the driving rod passes downward through the through hole and extends to the bottom of the base plate, and a driving device is also provided on the lower surface of the base plate, the driving device is drivingly connected to the driving rod extending to the bottom of the base plate, so as to drive the driving rod to rotate around its own axis; a first guide hole and a second guide hole are vertically provided on the B plate and pass through it, the first guide hole and the second guide hole are connected to the cavity setting, the first ejector pin and the second ejector pin respectively pass through the first guide hole and the second guide hole and extend to the top of the first guide hole and the second guide hole.

7. An injection mold according to claim 6, characterized in that: The lower surface of the B plate is provided with a receiving hole corresponding to the sleeve for receiving the sleeve.

8. The injection mold according to claim 6, characterized in that: The driving device includes a driving motor fixedly arranged on the lower surface of the base plate, a first bevel gear is fixedly arranged at the power output end of the driving motor, a second bevel gear matching with the first bevel gear is fixedly arranged at the bottom end of the driving rod corresponding to the first bevel gear, and the second bevel gear is meshed with the first bevel gear.

9. An injection mold according to claim 8, characterized in that: Position sensors for detecting the positions of the bottom needle plate and the surface needle plate are also provided on the square iron corresponding to the bottom needle plate and the surface needle plate.

10. An injection mold according to claim 9, characterized in that: A mounting seat is also provided on the lower surface of the B plate, and the top end of the driving rod is rotatably mounted on the mounting seat.

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