Mould locking mechanism for injection molding machine

Abstract

The invention discloses a mold locking mechanism for an injection molding machine, which comprises a tail plate component, a middle plate component, a lead screw mechanism and a machine hinge assembly, and the machine hinge assembly is a foldable structure; the first end of the machine hinge assembly is hinged to the middle plate component, the second end of the machine hinge assembly is hinged to the tail plate component, and the third end of the machine hinge assembly is hinged to the lead screw mechanism. And during mold locking, the machine hinge assembly is suitable for being unfolded under the driving of the lead screw mechanism and locking the middle plate component. The mechanical hinge assembly has the beneficial effects that the lead screw mechanism can directly drive the mechanical hinge assembly to be unfolded, the unfolded mechanical hinge assembly can act on the middle plate component, and then the middle plate component is locked; by means of the mode locking mechanism, conversion of middle hydraulic energy is omitted, the mode locking process is more efficient and stable, dependence on hydraulic oil and sealing pieces is reduced, meanwhile, threads in the lead screw mechanism have self-locking performance, and therefore when electric energy breaks down, the locking state of the middle plate component can be guaranteed, and stability in the mode locking process is further enhanced.

Description

Technical Field

[0001] The present application relates to the technical field of injection molding machines, and in particular to a mold locking mechanism for injection molding machines. Background Art

[0002] Injection machine, also known as injection molding machine, is the main molding equipment that uses plastic molding molds to make thermoplastics or thermosetting plastics into plastic products of various shapes. The middle plate component of the clamping column is one of the most important components in the injection molding machine. It is an important component used to overcome the expansion force of the molten rubber when the injection molding machine produces plastic products to generate the clamping force. In the prior art, the power source of the clamping force is provided by the hydraulic cylinder, that is, electrical energy is converted into hydraulic energy, and then hydraulic energy is converted into mechanical energy. It is highly dependent on hydraulic oil and seals. Once the hydraulic oil leaks or the seals are damaged, the clamping mechanism will fail, affecting the normal operation of the injection molding machine. For this reason, a stable clamping mechanism for an injection molding machine is proposed to solve the above technical problems. Summary of the invention

[0003] One of the purposes of the present application is to provide a clamping mechanism for an injection molding machine.

[0004] In order to achieve the above objectives, the technical solution adopted in the present application is: a locking mechanism for an injection molding machine, comprising a tail plate component, a middle plate component, a screw mechanism and a machine hinge assembly, wherein the machine hinge assembly is a foldable structure; the first end of the machine hinge assembly is hinged to the middle plate component, the second end of the machine hinge assembly is hinged to the tail plate component, and the third end of the machine hinge assembly is hinged to the screw mechanism; when locking the mold, the machine hinge assembly is suitable for unfolding and locking the middle plate component under the drive of the screw mechanism.

[0005] Preferably, the screw mechanism includes a motor 1, a transmission assembly, a locking screw and a crosshead, the motor 1 is installed on the outside of the tail plate component and is flush with the end of the tail plate component, the locking screw is rotatably installed on the tail plate component and the end is matched with the output end of the motor 1 through the transmission assembly, the crosshead is slidably arranged on the tail plate component and cooperates with the locking screw, and the crosshead is hinged to the third end of the hinge assembly; when locking the mold, the motor 1 is suitable for driving the locking screw to rotate through the transmission assembly, thereby driving the crosshead to slide and act on the hinge assembly to unfold.

[0006] Preferably, the hinge assembly is symmetrically distributed up and down, and includes connecting plate one, connecting plate two and connecting plate three. The first end of connecting plate one is the first end of the hinge assembly, the first end of connecting plate two is the second end of the hinge assembly, the first end of connecting plate three is the third end of the hinge assembly, the second end of connecting plate one is hinged to the second end of connecting plate two, and the second end of connecting plate three is hinged to the middle part of connecting plate two; the crosshead is suitable for driving connecting plate two and connecting plate one to rotate relative to each other through connecting plate three, thereby realizing the expansion or contraction of the hinge assembly.

[0007] Preferably, hinge point one is formed between connecting plate one and the middle plate component, hinge point two is formed between connecting plate one and connecting plate two, and hinge point three is formed between connecting plate two and the tail plate component; when clamping, the three hinge points are located on the same straight line.

[0008] Preferably, one side of the middle plate component is equipped with a supporting hinge ear which is symmetrically distributed up and down, and the supporting hinge ear is hinged to the connecting plate, and the projection inclination angle of the axis of the supporting hinge ear and the axis of the middle plate component on the vertical plane is θ, wherein 8°≦θ≦20°; the axial surfaces of the two supporting hinge ears intersect and cooperate with the other side surface of the middle plate component to form an installation space, and the installation space is suitable for installing the injection mold; when locking the mold, the axis of the supporting hinge ear coincides with the straight line formed by the three hinge points during locking the mold.

[0009] Preferably, the middle parts of the two supporting hinge ears are connected by a tie rod, and an installation cavity is formed between the tie rod, the supporting hinge ear and the middle plate component; a groove body is provided on the supporting hinge ear, so that a pair of front-to-back symmetrical supporting edges are formed between the supporting hinge ear and the middle plate component; the middle thickness of the middle plate component is greater than the edge thickness of the middle plate component.

[0010] Preferably, the locking mechanism of the injection molding machine also includes a head plate component, and the head plate component is connected and cooperated with the tail plate component through a plurality of coring columns; when injection molding is performed, the expansion force of the mold is suitable for driving the coring columns to deform and generate a reaction force, thereby locking the mold.

[0011] Preferably, the middle plate component is installed through a linear guide rail assembly; the Corinthian columns are provided with four and are distributed in a rectangular shape, the lower pair of Corinthian columns pass through the middle plate component and form a gap fit with the middle plate component, and notches are provided on both sides of the top of the middle plate component, and the notches cooperate with the upper pair of Corinthian columns.

[0012] Preferably, the mold locking mechanism of the injection molding machine also includes a mold adjusting mechanism, which includes a second motor, a transmission device and a plurality of screw sleeves, the screw sleeves are rotatably mounted on the tail plate component and cooperate with the corresponding Corinthian column through threads, the second motor is mounted on the outside of the tail plate component and flush with the end of the tail plate component, the first motor and the second motor are symmetrically arranged, the transmission device is mounted on the tail plate component and the input end is connected to the output end of the second motor, and the output end of the transmission device is connected to the screw sleeve; when adjusting, the second motor is suitable for driving the screw sleeve to rotate through the transmission device, so that the tail plate component is moved and adjusted along the axial direction of the Corinthian column, thereby adapting to different models of molds.

[0013] Preferably, the transmission device includes a driving gear, a gear ring and a plurality of driven gears, the driving gear is mounted on the output end of the second motor, the gear ring is rotatably mounted on the tail plate component and meshes with the driving gear, and the driven gear is sleeved and mounted on the corresponding screw sleeve and meshes with the gear ring; when adjusting, the second motor is suitable for driving the gear ring to rotate through the driving gear, and then the screw sleeve is suitable for synchronous rotation under the meshing transmission of the gear ring and the driven gear.

[0014] Compared with the prior art, the beneficial effects of this application are:

[0015] The present invention is provided with a screw mechanism. When locking the mold, the screw mechanism will directly drive the hinge assembly to expand, and the expanded hinge assembly will act on the middle plate component, thereby locking the middle plate component; that is, the conversion of intermediate hydraulic energy is eliminated, making the mold locking process more efficient and stable, and reducing the dependence on hydraulic oil and seals. At the same time, the thread in the screw mechanism has self-locking properties, so when the power fails, the locking state of the middle plate component can also be guaranteed, further enhancing the stability during mold locking. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 It is a schematic diagram of the state of the middle plate component of the present invention when the mold is opened and locked.

[0018] Figure 3 It is a schematic diagram of the structure of the screw mechanism, tail plate assembly, hinge assembly and middle plate component after being disassembled.

[0019] Figure 4 It is a structural schematic diagram of the screw mechanism and the mold adjustment mechanism of the present invention when they are installed on the tail plate component.

[0020] Figure 5It is a schematic diagram of the specific structure of the screw mechanism of the present invention.

[0021] Figure 6 It is a schematic diagram of the three-dimensional structure of the hinge assembly of the present invention.

[0022] Figure 7 It is a schematic diagram of the working principle of the hinge assembly of the present invention.

[0023] Figure 8 It is a schematic diagram of the specific matching structure of the support hinge ear of the present invention installed on the middle plate component.

[0024] Fig. 9 It is a schematic diagram of the three-dimensional and top view structure of the middle plate component of the present invention.

[0025] Fig.10 It is a schematic diagram of the middle plate component of the present invention when it cooperates with the linear guide rail assembly.

[0026] Fig.11 It is a schematic diagram of the side structure of the middle plate component of the present invention.

[0027] Fig.12 It is a schematic diagram of the specific structure of the mold adjustment mechanism of the present invention.

[0028] Fig.13 It is a schematic diagram of the specific structure of the transmission device of the present invention.

[0029] In the figure: 1. tail plate component; 2. middle plate component; 3. head plate component; 4. screw mechanism; 401. motor one; 402. transmission assembly; 403. locking screw; 404. crosshead; 5. machine hinge assembly; 501. connecting plate one; 502. connecting plate two; 503. connecting plate three; 6. Golin column; 7. mold adjustment mechanism; 701. motor two; 702. transmission device; 7021. driving gear; 7022. gear ring; 7023. driven gear; 703. screw sleeve; 8. tail plate steel belt assembly; 9. mechanical lock assembly; 10. linear guide rail assembly; 11. support hinge ear; 12. ejector assembly; 13. tie rod; 14. trough body; 15. notch; 16. column slot; 17. installation cavity; 18. support edge. DETAILED DESCRIPTION

[0030] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0031] In the description of the present application, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present application and simplifying the description, and do 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 cannot be understood as limiting the specific scope of protection of the present application.

[0032] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0033] One of the preferred embodiments of the present application is as follows: Figures 1 to 13 As shown, a clamping mechanism for an injection molding machine includes a tail plate component 1, a middle plate component 2, a screw mechanism 4 and a hinge assembly 5, wherein the tail plate component 1 and the middle plate component 2 are commonly used components in an injection molding machine, and a mold is generally installed on the middle plate component 2. Of course, its specific structure and position are common knowledge known to those skilled in the art, so it will not be repeated. The screw mechanism 4 is installed on the tail plate component 1, and the hinge assembly 5 is a foldable structure, wherein the first end of the hinge assembly 5 is hinged to the middle plate component 2, the second end of the hinge assembly 5 is hinged to the tail plate component 1, and the third end of the hinge assembly 5 is hinged to the screw mechanism 4.

[0034] It is understandable that when the mold is locked, the screw mechanism 4 will directly drive the hinge assembly 5 to expand, and the expanded hinge assembly 5 will act on the middle plate component 2, thereby locking the middle plate component 2. It can be seen that in the prior art, electrical energy is converted into hydraulic energy, and then the hydraulic energy is converted into mechanical energy to achieve the locking of the middle plate component 2. In this design, the locking of the middle plate component 2 is achieved directly through the mechanical structure under the drive of electrical energy, and the thread in the screw mechanism 4 has self-locking properties. Therefore, when the electrical energy fails, the locking state of the middle plate component 2 can also be guaranteed, further enhancing the stability during mold locking.

[0035] It should be noted that the hinge assembly 5 here is to achieve a force amplification effect, so that a smaller driving force can achieve stable locking of the middle plate component 2. Of course, when opening the mold, the screw mechanism 4 will drive the hinge assembly 5 to fold and shrink. At this time, the folded and shrunk hinge assembly 5 will release the lock on the middle plate component 2, thereby facilitating the mold opening operation.

[0036] As a further description of the above embodiment: Figure 4 and Figure 5As shown, the screw mechanism 4 includes a motor 401, a transmission assembly 402, a locking screw 403 and a crosshead 404. The motor 401 is installed on the outside of the tail plate component 1, the locking screw 403 is rotatably installed on the tail plate component 1 and the end thereof cooperates with the output end of the motor 401 through the transmission assembly 402, the crosshead 404 is slidably arranged on the tail plate component 1 and cooperates with the locking screw 403, and the crosshead 404 is hinged to the third end of the machine hinge assembly 5.

[0037] It is understandable that when the mold is locked, the forward rotation of the motor 1 401 can drive the locking screw 403 to rotate through the transmission assembly 402, thereby driving the crosshead 404 to slide and act on the hinge assembly 5 to unfold. Similarly, when the motor 1 401 is reversed, it can drive the hinge assembly 5 to fold and shrink.

[0038] like Figure 4 As shown, in fact, the mold locking screw 403 can be directly connected to the output end of the motor 1 401, that is, the motor 1 401 is installed at the end position of the tail plate component 1, but this will increase the length of the tail plate component 1, and then increase the volume of the entire injection molding machine. Therefore, in this design, the output end of the motor 1 401 cooperates with the mold locking screw 403 through the transmission component 402, and the motor 1 401 can be installed at the side position of the tail plate component 1 and is flush with the end of the tail plate component 1 (i.e., inverted installation), so that the length of the tail plate component 1 will not be excessively "extended", and the overall length of the mold locking column frame is short, so that the length of the injection molding machine is short on the site, which is convenient for placing a large number of machines on the same site and saving site space. Of course, this application does not specifically limit the structure of the transmission component 402, for example, belt drive, chain drive or gear drive, etc. can be used.

[0039] In one of the embodiments of the present application, Figure 6 As shown, the hinge assembly 5 preferably adopts a vertically symmetrical distribution arrangement, so that the hinge assembly 5 can be more stable and reliable when performing mold clamping support. At the same time, the vertically symmetrical structure can also make the hinge assembly 5 more uniform when subjected to force, avoiding structural damage caused by excessive force in a single direction, thereby further enhancing the service life and stability of the mold clamping mechanism. Specifically, the hinge assembly 5 includes a connecting plate 1 501, a connecting plate 2 502, and a connecting plate 3 503. The first end of the connecting plate 1 501 is the first end of the hinge assembly 5, the first end of the connecting plate 2 502 is the second end of the hinge assembly 5, the first end of the connecting plate 3 503 is the third end of the hinge assembly 5, the second end of the connecting plate 1 501 is hinged to the second end of the connecting plate 2 502, and the second end of the connecting plate 3 503 is hinged to the middle of the connecting plate 2 502.

[0040] In order to facilitate understanding of the specific driving process of the screw mechanism 4, its working principle is described below:

[0041] The initial state (i.e. mold opening state) is as follows Figure 2 As shown in (b), the hinge assembly 5 is in the folded storage state, which is also the maximum opening state, that is, the distance between the middle plate component 2 and the head plate component 3 in the injection molding machine is the largest, and the distance between the two is set to W. Figure 7 As shown in (d), the forward rotation of the motor 1 401 drives the locking screw 403 to rotate through the transmission assembly 402, and the locking screw 403 drives the cross head 404 to move rightward, and the cross head 404 acts on the upper and lower connecting plates 3 503, thereby causing the originally "lying down" connecting plate 3 503 to rotate "upright" and lift up the connecting plate 2 502, and at the same time, the connecting plate 2 502 will rotate and act on the connecting plate 1 501, and finally the middle plate component 2 will move to the right under the push of the connecting plate 1 501, close to the head plate component 3 for mold closing, as shown in FIG. Figure 2 As shown in (a), this is the mold closing state diagram. The distance between the middle plate component 2 and the head plate component 3 is set to D. Of course, the difference V between W and D is the mold opening movement stroke V of the middle plate component 2, that is, V is the required space size for taking the product.

[0042] It should be known that a mold for injection molding (not shown) is installed between the middle plate component 2 and the head plate component 3. Specifically, a movable mold plate is generally installed on the middle plate component 2, and a fixed mold plate is installed on the head plate component 3. Of course, this is also well known to people in this field.

[0043] Further preferably, Figure 7 As shown in (c), a hinge point 1 is formed between the connecting plate 1 501 and the middle plate component 2, a hinge point 2 is formed between the connecting plate 1 501 and the connecting plate 2 502, and a hinge point 3 is formed between the connecting plate 2 502 and the tail plate component 1. When clamping the mold, the three hinge points are located on the same straight line (as shown by the dotted line in the figure), that is, the unfolded connecting plate 1 501 and the connecting plate 2 502 are located on the same straight line, so that the connecting plate 1 501 and the connecting plate 2 502 are self-locking, which enhances the stability of the hinge assembly 5 when clamping the mold. Of course, the three hinge points here do not only refer to physical connection points, but refer to the equivalent hinge points formed between the connecting plate 1 501, the connecting plate 2 502 and the connecting plate 3 503 during the action process.

[0044] Further preferably, in order to improve the limiting effect on the middle plate component 2, it is preferred to install a support hinge ear 11 symmetrically distributed up and down on one side (left side) of the middle plate component 2, that is, the upper support hinge ear 11 cooperates with the upper connecting plate 1 501, and the lower support hinge ear 11 cooperates with the lower connecting plate 1 501, thereby forming a vertically symmetrical support limit to improve the stability of the middle plate component 2 in the clamping state. In the usual design by personnel in this field, the support hinge ear 11 and the middle plate component 2 are vertically arranged, that is, the force acts vertically on the middle plate component 2 for limiting, so it is not possible to evenly apply the support force to the mold of the middle plate component 2. If more groups of support hinge ears 11 are used to achieve uniform support, the structure will be complicated, the cost will be high, and more installation space will be occupied.

[0045] Therefore, in order to solve the above technical problems, Figure 8 As shown, the support hinge ear 11 can be installed at an angle, that is, the support hinge ear 11 is installed at an angle relative to the horizontal plane of the axis of the middle plate component 2. Since the two support hinge ears 11 are symmetrically distributed up and down, the axis extension lines of the two support hinge ears 11 intersect at the "O" point on the other side (right side) of the middle plate component 2. In other words, the axis surfaces of the two support hinge ears 11 will intersect, and then the two axis surfaces cooperate with the right side surface of the middle plate component 2 to form an installation space. This installation space is a triangular prism structure, and the injection mold is installed in this installation space. When clamping the mold, the axis of the support hinge ear 11 coincides with the straight line formed by the three hinge points during clamping.

[0046] It should be noted that the axial surface of the supporting hinge ear 11 mentioned above means: a surface parallel to the upper (lower) end surface of the supporting hinge ear 11 and passing through the axis of the supporting hinge ear 11.

[0047] It is understandable that if Figure 8 As shown, the clamping force acts on the support hinge ear 11 obliquely along the direction of A, that is, the upper and lower clamping forces directly act on the support hinge ear 11, and the two forces are relatively inclined and applied close to the axial position of the middle plate component 2. Therefore, the clamping force not only acts perpendicularly to the middle plate component 2, but also forms an inward extrusion force on the mold of the middle plate component 2, so that the force can act evenly on the mold, thereby enhancing the limiting effect on the mold, making the mold more stable and reliable during clamping. At the same time, due to the inclined setting of the support hinge ear 11, the point of action of the clamping force on the middle plate component 2 (i.e., point "O") is closer to the center position of the mold, thereby further improving the stability during clamping.

[0048] It should be noted that the inclination angle of the support hinge ear 11 also needs to be optimized. Specifically, the projection inclination angle of the axis of the support hinge ear 11 and the axis of the middle plate component 2 on the vertical plane is set to θ, where 8°≦θ≦20°, that is, the inclination angle of the support hinge ear 11 cannot be too large or too small. For example, if the inclination angle is too small, for example, θ is 3°, it means that the support hinge ear 11 and the middle plate component 2 are still close to vertical, and then there is still a problem that the supporting force cannot be well and evenly applied to the mold; if the inclination angle is too large, for example, θ is 30°, then under the action of the clamping force, the connection between the support hinge ear 11 and the middle plate component 2 is prone to deformation, and even causes the support hinge ear 11 itself to deform and be damaged, thereby affecting the service life and stability of the clamping mechanism. Therefore, setting the projection inclination angle θ of the axis of the supporting hinge ear 11 and the axis of the middle plate component 2 on the vertical plane to 8°≦θ≦20° can enable the clamping force to act better on the mold, while ensuring the stability of the connection between the supporting hinge ear 11 and the middle plate component 2, further improving the service life and stability of the clamping mechanism.

[0049] Based on the above embodiment, there may be such a problem when it is used: because the two support hinge ears 11 are symmetrically inclined, the two support hinge ears 11 will still be stretched outward when subjected to force, that is, the two support hinge ears 11 may still be deformed and damaged. Therefore, in order to solve this problem, one of the embodiments of the present application, such as Fig. 9 As shown, the middle parts of the upper and lower support hinge ears 11 are connected by a tie rod 13 , and a mounting cavity 17 is formed between the tie rod 13 , the support hinge ears 11 and the middle plate component 2 .

[0050] It is understandable that, through the provision of the tie rod 13, when the mold is clamped, the strength of the two outwardly stretched support hinge ears 11 can be further enhanced under the action of the tie rod 13, thereby preventing the support hinge ears 11 from deforming, and improving the service life and stability of the mold clamping mechanism. At the same time, the installation cavity 17 can also provide a certain installation space for the ejection assembly 12. Of course, the ejection assembly 12 is also common knowledge known to those skilled in the art, so it will not be described in detail.

[0051] like Fig. 9 As shown, if the supporting hinge ear 11 adopts a "plate-type" structure as a whole, stress concentration problems may easily occur when supporting the middle plate component 2. That is to say, under the action of the hinge assembly 5, the force of the supporting hinge ear 11 on the middle plate component 2 is concentrated at the center position of the connection between the supporting hinge ear 11 and the middle plate component 2, which may cause the supporting force to be not evenly applied in the front-to-back direction.

[0052] Therefore, in order to solve the above technical problems, Fig. 9As shown in (e), a groove 14 is provided on the support hinge ear 11, so that two support edges 18 of front-to-back symmetrical design can be formed between the support hinge ear 11 and the middle plate component 2, so that the supporting force can be evenly distributed on the front and back sides of the middle plate component 2; because the support hinge ear 11 has a pair, there will be four support edges 18 distributed in a rectangular shape, thus forming a "four-point" support limit for the middle plate component 2, which greatly improves the stability during mold locking. At the same time, the "hollowing out" design can save materials and reduce the weight of the middle plate component 2 on the basis of ensuring strength, further reducing production costs. Of course, due to the design of the groove 14, after the subsequent ejection component 12 fails, it can also provide a certain operating space for subsequent maintenance, thereby improving the convenience of subsequent maintenance.

[0053] Further, such as Fig. 9 As shown in (f), in order to improve the stability of the support edge 18, the support edge 18 is provided with an extension portion away from the trough body 14 and close to the side of the middle plate component 2. In layman's terms, an external support foot-shaped structure is provided at the connection of the support edge 18, as shown at B in the figure. The external support foot-shaped structure can increase the contact area between the support edge 18 and the middle plate component 2, so that the supporting force can be more evenly distributed on the middle plate component 2, further improving the stability during clamping. At the same time, the external support foot-shaped structure can also increase the overall strength of the support hinge ear 11, prevent deformation or damage during the clamping process, and thus extend the service life of the clamping mechanism.

[0054] Further preferably, in the actual stress process of the middle plate component 2, the middle position of the middle plate component 2 is the concentrated point of stress, and the outer edge (edge) is subjected to little or no traction force and less deformation. Therefore, the thickness of the middle portion of the middle plate component 2 can be designed to be greater than the thickness of the edge, as shown in the following example: Figure 8 As shown in the figure, assuming that the middle thickness of the middle plate component 2 is H and the edge thickness of the middle plate component 2 is L, then H is greater than L. This design can make the middle plate component 2 more uniform when subjected to force, avoiding deformation of the middle position due to excessive force, thereby further improving the stability and service life of the clamping mechanism. At the same time, the design of the middle thickness being greater than the edge thickness can also save materials and reduce production costs while ensuring strength. Of course, if Fig.10 As shown, in order to achieve a better transition and processing between the edge and the middle of the middle plate component 2, a chamfering method can be used to achieve a thinner edge.

[0055] In one of the embodiments of the present application, Figure 1As shown, the head plate component 3 and the tail plate component 1 can be connected by a plurality of coring posts 6, preferably four and distributed in a rectangular shape. It can be understood that during injection molding, the expansion force of the plastic product inside the mold during the injection molding process causes the coring posts 6 in the head plate component 3 to produce elastic deformation and generate reaction force, thereby binding and locking the mold. At the same time, due to the setting of the coring posts 6, the connection between the head plate component 3 and the tail plate component 1 installed in the injection molding machine body can be made more stable.

[0056] It should be known that in the prior art, the middle plate component 2 is generally guided and limited by the coring column 6, so it is necessary to consider the wear and lubrication between the two. Therefore, in order to solve the above problem, in one embodiment of the present application, Figure 1 As shown, the middle plate component 2 can be installed on the injection molding machine through the linear guide rail assembly 10. The linear guide rail assembly 10 adopts a rolling friction guide rail, which has a small friction coefficient, flexible and stable movement with high precision, and can reduce the friction resistance of the middle plate component 2 during movement. Compared with the original guiding and limiting by the coring column 6, there is no lubricating oil pollution to the product and the environment.

[0057] Based on the above embodiment, since the Corinth column 6 also needs to pass through the middle plate component 2, in order to make the two cooperate more coordinated, the details are as follows: Fig.11 As shown, first, column grooves 16 are provided on both sides of the lower end of the middle plate component 2, and a pair of Corinthian columns 6 below pass through the column grooves 16, and a clearance fit is made between the column grooves 16 and the Corinthian columns 6. In this way, on the one hand, the two do not contact each other, and thus will not affect the sliding of the middle plate component 2; on the other hand, assuming that the linear guide assembly 10 deviates later, the column grooves 16 and the Corinthian columns 6 will contact each other at this time. Of course, after the two contact, the Corinthian columns 6 can also play a guiding role; and the main purpose is to enable the staff to promptly discover the failure of the linear guide assembly 10, and then promptly repair it. Second, notches 15 are provided on both sides of the upper end of the middle plate component 2, and a pair of Corinthian columns 6 above pass through the notches 15. In this way, the design of the notch 15 can reduce the cost material of the middle plate component 2, and at the same time, it can also make the structure of the middle plate component 2 simpler and reduce its overall weight.

[0058] In one of the embodiments of the present application, Figure 1 , Fig.12 and Fig.13 As shown, the mold locking mechanism of the injection molding machine also includes a mold adjusting mechanism 7, which includes a second motor 701, a transmission device 702 and a plurality of screw sleeves 703, the screw sleeves 703 are rotatably installed on the tail plate component 1 and are matched with the corresponding coring column 6 through threads, the second motor 701 is installed on the tail plate component 1, the transmission device 702 is installed on the tail plate component 1 and the input end is connected to the output end of the second motor 701, and the output end of the transmission device 702 is connected to the screw sleeve 703.

[0059] It can be understood that when adjusting, the motor 2 701 can drive the screw sleeve 703 to rotate through the transmission device 702. Under the action of the coring column 6, the screw sleeve 703 can drive the tail plate component 1 to move and adjust along the axial direction of the coring column 6, thereby realizing the change of the above-mentioned middle D distance, which can adapt to the installation of molds with different mold thicknesses.

[0060] The present application does not specifically limit the structure of the transmission device 702. A specific embodiment is provided below for reference:

[0061] like Fig.13 As shown, the transmission device 702 includes a driving gear 7021, a gear ring 7022 and a plurality of driven gears 7023. The driving gear 7021 is installed at the output end of the motor 2 701. The gear ring 7022 is rotatably installed on the tail plate component 1 and meshes with the driving gear 7021. The driven gear 7023 is sleeved and installed on the corresponding screw sleeve 703 and meshes with the gear ring 7022.

[0062] It can be understood that when adjusting, the motor 2 701 can drive the driving gear 7021 to rotate, and the driving gear 7021 acts on the gear ring 7022 to rotate, and the gear ring 7022 can drive all the driven gears 7023 to rotate synchronously, that is, the screw sleeve 703 rotates synchronously to perform axial movement adjustment along the Corinth column 6.

[0063] Further preferably, the second motor 701 is also installed on the outside of the tail plate component 1 and is flush with the end of the tail plate component 1, that is, the same inverted arrangement as the first motor 401 is adopted, so as to reduce the overall length of the tail plate component 1, and at the same time, the first motor 401 and the second motor 701 are symmetrically arranged (such as Figure 4 As shown), the tailgate component 1 is evenly stressed, and the two motors are away from each other, so that there is no interference between them, thereby improving the stability of the device operation.

[0064] In this embodiment, Figure 1 As shown, in order to achieve effective force transmission, the tail plate component 1 is installed on the injection molding machine through the tail plate steel belt assembly 8, and the middle plate component 2 is installed on the linear guide rail assembly 10, so that the center height of the tail plate component 1 is consistent with the center height of the middle plate component 2, and is consistent with the center height of the head plate component 3, thereby achieving smooth force transmission. Of course, a mechanical lock assembly 9 is also installed on the injection molding machine, and the mechanical lock assembly 9 cooperates with the middle plate component 2 to achieve locking and unlocking of the middle plate component 2. Of course, the mechanical lock assembly 9 and the above-mentioned tail plate steel belt assembly 8 are also common knowledge known to those skilled in the art, so they will not be repeated.

[0065] The main beneficial effects of the present invention are: (1) Compared with the traditional middle plate multi-rib, grid-type box-type template structure, the middle plate component 2 of the present design is convenient in shape and easy to assemble. In particular, the simple plate and frame structure of the middle plate saves the amount of raw materials, and the corresponding raw material extraction and consumption energy saving. (2) The column 6 is not in contact with the middle plate component 2, and there is no pollution of lubricating oil to the product and the environment; thus, there are energy-saving benefits in the industry. (3) The middle plate support moves on the linear guide rail, with small force, small power requirement, and energy saving; the control accuracy is high; the injection molding machine uses the ejector in a small space, which is easy to operate, simple in design structure, and uniform in force, which is conducive to mass production.

[0066] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. A clamping mechanism for an injection molding machine, characterized in that: include: Tailgate parts; mid-panel components; a screw mechanism mounted on the tail plate component, and A hinge assembly, wherein the hinge assembly is a foldable structure; the first end of the hinge assembly is hinged to the middle plate component, the second end of the hinge assembly is hinged to the tail plate component, and the third end of the hinge assembly is hinged to the screw mechanism; when locking the mold, the hinge assembly is suitable for unfolding and locking the middle plate component under the drive of the screw mechanism.

2. The clamping mechanism for an injection molding machine according to claim 1, characterized in that: The screw mechanism includes a motor 1, a transmission assembly, a locking screw and a crosshead. The motor 1 is installed on the outside of the tail plate component and is flush with the end of the tail plate component. The locking screw is rotatably installed on the tail plate component and its end is matched with the output end of the motor 1 through the transmission assembly. The crosshead is slidably arranged on the tail plate component and matched with the locking screw, and the crosshead is hinged to the third end of the hinge assembly. When locking the mold, the motor 1 is suitable for driving the locking screw to rotate through the transmission assembly, thereby driving the crosshead to slide and act on the hinge assembly to unfold.

3. The clamping mechanism for an injection molding machine according to claim 2, characterized in that: The hinge assembly is symmetrically distributed up and down, and includes connecting plate one, connecting plate two and connecting plate three. The first end of connecting plate one is the first end of the hinge assembly, the first end of connecting plate two is the second end of the hinge assembly, the first end of connecting plate three is the third end of the hinge assembly, the second end of connecting plate one is hinged to the second end of connecting plate two, and the second end of connecting plate three is hinged to the middle part of connecting plate two; the crosshead is suitable for driving connecting plate two and connecting plate one to rotate relative to each other through connecting plate three, thereby realizing the expansion or contraction of the hinge assembly.

4. The clamping mechanism for an injection molding machine according to claim 3, characterized in that: A hinge point 1 is formed between the connecting plate 1 and the middle plate component, a hinge point 2 is formed between the connecting plate 1 and the connecting plate 2, and a hinge point 3 is formed between the connecting plate 2 and the tail plate component; when the mold is locked, the three hinge points are located on the same straight line.

5. The clamping mechanism for an injection molding machine according to claim 4, characterized in that: One side of the middle plate component is equipped with a supporting hinge ear which is symmetrically distributed up and down, and the supporting hinge ear is hinged to the connecting plate 1. The projection inclination angle of the axis of the supporting hinge ear and the axis of the middle plate component on the vertical plane is θ, wherein 8°≦θ≦20°; the axial surfaces of the two supporting hinge ears intersect and cooperate with the other side surface of the middle plate component to form an installation space, and the installation space is suitable for installing the injection mold; when the mold is locked, the axis of the supporting hinge ear coincides with the straight line formed by the three hinge points during the mold locking.

6. The clamping mechanism for an injection molding machine according to claim 5, characterized in that: The middle parts of the two supporting hinge ears are connected by a tie rod, and the tie rod, the supporting hinge ears and the middle plate component enclose a mounting cavity; a groove body is provided on the supporting hinge ear, so that a pair of front-to-back symmetrical supporting edges are formed between the supporting hinge ear and the middle plate component; the middle thickness of the middle plate component is greater than the edge thickness of the middle plate component.

7. The clamping mechanism for an injection molding machine according to claim 6, characterized in that: The mold locking mechanism of the injection molding machine also includes a head plate component, and the head plate component is connected and matched with the tail plate component through a plurality of coring columns; when performing injection molding, the expansion force of the mold is suitable for driving the coring columns to deform and generate a reaction force, thereby locking the mold.

8. The clamping mechanism for an injection molding machine according to claim 7, characterized in that: The middle plate component is installed through a linear guide rail assembly; there are four Corinthian columns distributed in a rectangular shape, a pair of the Corinthian columns at the bottom pass through the middle plate component and form a gap fit with the middle plate component, and notches are provided on both sides of the top of the middle plate component, and the notches cooperate with the pair of the Corinthian columns at the top.

9. The clamping mechanism for an injection molding machine according to claim 7 or 8, characterized in that: The mold locking mechanism of the injection molding machine also includes a mold adjusting mechanism, which includes a second motor, a transmission device and a plurality of screw sleeves, the screw sleeves are rotatably mounted on the tail plate component and matched with the corresponding Corinthian column through threads, the second motor is mounted on the outside of the tail plate component and flush with the end of the tail plate component, the first motor is symmetrically arranged with the second motor, the transmission device is mounted on the tail plate component and the input end is connected to the output end of the second motor, and the output end of the transmission device is connected to the screw sleeve; When adjusting, the motor 2 is suitable for driving the screw sleeve to rotate through the transmission device, so that the tail plate component can be moved and adjusted along the axial direction of the coring column, thereby adapting to different models of the molds.

10. The clamping mechanism for an injection molding machine according to claim 9, characterized in that: The transmission device comprises a driving gear, a gear ring and a plurality of driven gears, wherein the driving gear is mounted on the output end of the second motor, the gear ring is rotatably mounted on the tail plate component and meshes with the driving gear, and the driven gear is sleeved and mounted on the corresponding screw sleeve and meshes with the gear ring; During adjustment, the motor 2 is suitable for driving the gear ring to rotate through the driving gear, and then the screw sleeve is suitable for synchronous rotation under the meshing transmission of the gear ring and the driven gear.

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