Ejection balance structure of SMC (Sheet Molding Compound) mold

Abstract

The utility model discloses an SMC (Sheet Molding Compound) mold ejection balance structure, which is used for ejection and demolding of a rear mold plate and comprises an ejector plate, an ejector pin, a spring, a spring and a spring, and is characterized in that the ejector plate is movably arranged below the rear mold plate; the two transmission rods are arranged in a crossed mode, the two ends of each transmission rod are connected with a bearing assembly and a gear respectively, the gears synchronously rotate along with the transmission rods, and the bearing assemblies are fixed to the ejector pin plate; the four spur racks are fixed relative to the rear mold plate and are vertically arranged; the spur racks are meshed and matched with the gears in a one-to-one correspondence manner; according to the utility model, the problem of desynchrony in a hydraulic system is solved with low cost, and the locking of the ejector pin and the inclined ejector is effectively prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of production molds, in particular to an SMC mold ejection balance structure. Background Art

[0002] There are generally two ways to demould parts. One is to demould manually by blowing air, and the other is to demould mechanically and remove parts by machine. Mechanical ejection is powered by four oil cylinders acting on the four corners of the ejector plate to drive the ejector plate to move the ejector up and down. When the four oil cylinders move unbalanced, the ejector and the inclined ejector may burn, get stuck, or be unable to return. The main reason for these situations is that the oil cylinders are not running synchronously.

[0003] Reasons for the asynchronous operation of the four cylinders: 1. Deviation of the external loads of the four cylinders, such as different resistance and friction of the four cylinders will lead to imbalance. The displacement of the cylinder with small resistance will be larger. 2. Differences in internal friction, such as the difference in friction between the piston and the cylinder, and between the piston rod and the seal of each cylinder, lead to asynchronous operation of the cylinders. 3. The difference in resistance of the hydraulic oil along the oil pipeline of the four cylinders leads to asynchronous operation of the cylinders. 4. Deviation of the adjustment of the control components leads to asynchronous operation of the flow. For example, if each cylinder uses an independent throttle valve, the difference in the flow of the inlet and outlet oil will affect the synchronization of the two cylinders. 5. The supporting point of the cylinder of the supported component has deviated from the beginning, that is, the initial state is skewed. 6. After the cylinder has been used for too long, internal leakage between the piston and the cylinder occurs, resulting in asynchronous operation of the double cylinders.

[0004] The general solution is to use imported gear diverters, which are expensive and take a long time to purchase. Gear diverters are only used for ejection. When the mold is ejected too much, there is still a risk of jamming when it is returned. The cost of adding an additional gear oil separator will increase a lot. Therefore, a low-cost alternative is urgently needed. Summary of the invention

[0005] The utility model aims to provide an SMC mold ejection balance structure to solve the problems existing in the prior art, reduce the asynchronism problem in the hydraulic system at a low cost, and effectively prevent the ejector pin and the inclined ejector from getting stuck.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] The invention discloses an SMC mold ejection balance structure, which is used for ejection and demoulding of a rear mold plate, and comprises: an ejector plate, which is movably arranged below the rear mold plate; two cross-arranged transmission rods, each of which is respectively connected with a bearing assembly and a gear at both ends, the gear rotates synchronously with the transmission rod, and the bearing assembly is fixed to the ejector plate; and four spur racks which are fixed relative to the rear mold plate and vertically arranged, and the spur racks are meshed with the gears in a one-to-one correspondence.

[0008] Furthermore, the two transmission rods are arranged in a cross shape.

[0009] Furthermore, the two transmission rods have the same length, and the intersection of the two transmission rods is the midpoint of each.

[0010] Furthermore, the ejector plate includes an ejector base plate and an ejector panel fixedly connected to the upper side of the ejector base plate, and the bearing assembly is fixedly connected to the lower side of the ejector base plate.

[0011] Furthermore, the bearing assembly includes a rolling bearing and a bearing seat, the inner ring of the rolling bearing is connected to the transmission rod via a keyway, the outer ring of the rolling bearing is fixed to the bearing seat, and the bearing seat is fixed to the ejector plate.

[0012] Furthermore, the ejection balancing structure also includes a lifting drive device, and the lifting drive device is configured to drive the ejector plate to move up and down.

[0013] Furthermore, the lifting drive device includes four vertically arranged ejector cylinders, the cylinder bodies of the ejector cylinders are fixed to the ejector plates, and the movable rods of the ejector cylinders are fixed relative to the rear template.

[0014] Furthermore, a plurality of square steels are fixedly connected to the lower side of the rear template, a support base plate is fixedly connected to the lower side of the square steel, the ejector plate is arranged between the support base plate and the rear template, and the spur rack is fixed to the square steel.

[0015] Furthermore, the ejection balancing structure includes a limiting structure for limiting the lifting stroke of the ejector plate.

[0016] Furthermore, the limiting structure is a baffle plate provided on the upper side of the spur rack, and the baffle plate is used to limit the upward movement of the gear.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] By cross-setting the transmission rods, the transmission rods are connected to the ejector plate through the bearing assembly, which is equivalent to the principle that two crossed straight lines jointly determine a plane. When the two transmission rods will not tilt due to the limiting effect of the gear racks at the ends, it is ensured that the ejector plate is in a horizontal state and will not tilt during the lifting process. In other words, by setting up a mechanical synchronization mechanism, the asynchronous problem in the hydraulic system can be reduced at a low cost, and the ejector and the inclined ejector can be effectively prevented from getting stuck. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural schematic diagram of an ejection balance structure in one embodiment of the present application;

[0020] Figure 2 For this application Figure 1 A partial enlarged view of the middle A;

[0021] Figure 3 It is a partial three-dimensional schematic diagram of the ejection balance structure in one embodiment of the present application;

[0022] In the figure: 1, ejector plate; 101, ejector bottom plate; 102, ejector panel; 2, rear template; 3, transmission rod; 4, bearing assembly; 401, rolling bearing; 402, bearing seat; 5, gear; 6, spur rack; 7, ejector cylinder; 8, square steel; 9, support bottom plate; 10, baffle. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the utility model to clearly and completely describe the technical solution of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0025] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0026] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] like Figures 1 to 3 As shown, the present application provides an SMC mold ejection balancing structure for the ejection and demolding of the rear template, including: an ejector plate 1, movably arranged below the rear template 2; two cross-arranged transmission rods 3, each of the two ends of the transmission rod 3 is respectively connected to a bearing assembly 4 and a gear 5, the gear 5 rotates synchronously with the transmission rod 3, and the bearing assembly 4 is fixed to the ejector plate 1; four spur racks 6 fixed relative to the rear template 2 and vertically arranged, and the spur racks 6 are meshed with the gears 5 in a one-to-one correspondence.

[0028] Among them, the rear template of the SMC mold is one of the key components of the mold. The rear template and the front template together constitute the mold cavity, which allows the material to be formed during the molding process and ensures that the product can be solidified according to the designed shape and size; the ejector plate 1 is located below the rear template 2 and is used to support the ejector and inclined ejector in the mold.

[0029] When the ejector plate 1 is lifted or lowered by the hydraulic drive device, the ejector plate 1 drives the two transmission rods 3 to be lifted or lowered synchronously through the bearing assembly 4. The transmission rod 3 drives the gear 5 to be lifted or lowered on the spur rack 6. The four spur racks 6 correspond to the four gears 5 respectively, ensuring that the four gears rotate synchronously and regulating the lifting and lowering amplitudes at both ends of the transmission rod 3, thereby providing a stable guide for the ejector plate 1 and ensuring that the ejector plate moves in the vertical direction during the lifting process to avoid deflection.

[0030] By cross-arranging the transmission rods 3, the transmission rods 3 are connected to the ejector plate 1 through the bearing assembly 4, which is equivalent to the principle that two crossed straight lines jointly determine a plane. When the two transmission rods 3 will not tilt due to the limiting effect of the gear racks at the end, it is ensured that the ejector plate 1 is in a horizontal state and will not tilt during the lifting process. In other words, by setting a mechanical synchronization mechanism, the asynchronous problem in the hydraulic system is reduced at a low cost, and the ejector and the inclined ejector are effectively prevented from getting stuck.

[0031] In some embodiments, the two transmission rods 3 are arranged in a cross shape. The cross-shaped transmission rods can more evenly distribute the force generated by the jacking cylinder, thereby reducing the deflection or distortion of the ejector plate during the lifting process.

[0032] In some embodiments, the two transmission rods 3 are of equal length, and the intersection of the two transmission rods 3 is the midpoint of each transmission rod 3. The transmission rods of equal length and the intersection at the midpoint provide structural symmetry, which helps to ensure the balance of the ejector plate 1 when it is lifted or lowered.

[0033] In some embodiments, the ejector plate 1 includes an ejector base plate 101 and an ejector panel 102 fixedly connected to the upper side of the ejector base plate 101, and the bearing assembly 4 is fixedly connected to the lower side of the ejector base plate 101. The ejector base plate 101 is a support member that receives the force of the hydraulic drive device, and provides support and power for the ejector panel 102. The ejector panel 102 is arranged with ejectors to achieve uniform ejection of the product.

[0034] In some embodiments, the bearing assembly 4 includes a rolling bearing 401 and a bearing seat 402, the inner ring of the rolling bearing 401 is connected to the transmission rod 3 through a keyway, the outer ring of the rolling bearing 401 is fixed to the bearing seat 402, and the bearing seat 402 is fixed to the ejector plate 1. The rolling bearing 401 reduces friction and wear, improves the reliability of the entire ejection system, and serves as an intermediate component for lifting power transmission.

[0035] In some embodiments, the ejection balancing structure further includes a lifting drive device, and the lifting drive device is configured to drive the ejector plate 1 to move up and down.

[0036] In some embodiments, the lifting drive device includes four ejector oil cylinders 7 vertically arranged and distributed around the ejector plate 1, the cylinder body of the ejector oil cylinder 7 is fixed to the ejector plate 1, and the movable rod of the ejector oil cylinder 7 is fixed relative to the rear template 2. The four ejector oil cylinders 7 need to be operated synchronously to ensure the balance of the ejector plate 1. By using four ejector oil cylinders 7 to provide symmetrical and uniform force, the vertical lifting of the ejector plate 1 is ensured to reduce tilting or deviation.

[0037] In some embodiments, a plurality of square steels 8 are fixedly connected to the lower side of the rear template 2, a support base plate 9 is fixedly connected to the lower side of the square steels 8, the ejector plate 1 is arranged between the support base plate 9 and the rear template 2, and the spur rack 6 is fixed to the square steels 8. The square steels act as connectors and support members, so that a spacing space is formed between the support base plate 9 and the rear template 2, providing a basis for the installation of the ejector plate 1.

[0038] In some embodiments, the ejection balancing structure includes a limiting structure for limiting the lifting stroke of the ejector plate 1 .

[0039] In some embodiments, the limiting structure is a baffle 10 disposed on the upper side of the spur rack 6, and the baffle 10 is used to limit the upward movement of the gear 5. The baffle 10 limits the upward movement of the gear 5 and prevents the ejector plate 1 from excessively rising.

[0040] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An SMC mold ejection balance structure, used for ejection and demoulding of the rear mold plate, characterized in that: include: An ejector plate (1) is movably disposed below the rear template (2); Two cross-arranged transmission rods (3), each transmission rod (3) having two ends connected to a bearing assembly (4) and a gear (5), the gear (5) rotating synchronously with the transmission rod (3), and the bearing assembly (4) being fixed to the ejector plate (1); Four spur racks (6) are fixed and vertically arranged relative to the rear template (2), and the spur racks (6) are meshed with the gears (5) in a one-to-one correspondence.

2. The SMC mold ejection balance structure according to claim 1, characterized in that: The two transmission rods (3) are arranged crosswise.

3. The SMC mold ejection balance structure according to claim 2, characterized in that: The two transmission rods (3) are of equal length, and the intersection point of the two transmission rods (3) is the midpoint of each.

4. The SMC mold ejection balance structure according to claim 1, characterized in that: The ejector plate (1) comprises an ejector base plate (101) and an ejector panel (102) fixedly connected to the upper side of the ejector base plate (101), and the bearing assembly (4) is fixedly connected to the lower side of the ejector base plate (101).

5. The SMC mold ejection balance structure according to claim 1, characterized in that: The bearing assembly (4) comprises a rolling bearing (401) and a bearing seat (402); the inner ring of the rolling bearing (401) is connected to the transmission rod (3) via a keyway; the outer ring of the rolling bearing (401) is fixed to the bearing seat (402); and the bearing seat (402) is fixed to the ejector plate (1).

6. The SMC mold ejection balance structure according to claim 1, characterized in that: The ejection balancing structure further comprises a lifting drive device, wherein the lifting drive device is configured to drive the ejector plate (1) to move up and down.

7. The SMC mold ejection balance structure according to claim 6, characterized in that: The lifting drive device comprises four ejection cylinders (7) which are vertically arranged and distributed around the ejector plate (1); the cylinder bodies of the ejection cylinders (7) are fixed to the ejector plate (1); and the movable rods of the ejection cylinders (7) are fixed relative to the rear template (2).

8. The SMC mold ejection balance structure according to claim 1, characterized in that: A plurality of square steels (8) are fixedly connected to the lower side of the rear template (2), a supporting base plate (9) is fixedly connected to the lower side of the square steel (8), the ejector plate (1) is arranged between the supporting base plate (9) and the rear template (2), and the spur rack (6) is fixed to the square steel (8).

9. The SMC mold ejection balance structure according to claim 1, characterized in that: The ejection balancing structure comprises a limiting structure for limiting the lifting and lowering stroke of the ejector plate (1).

10. The SMC mold ejection balance structure according to claim 9, characterized in that: The limiting structure comprises a baffle (10) arranged on the upper side of the spur rack (6), and the baffle (10) is used to limit the upward movement of the gear (5).

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