A multi-gear injection mold

Abstract

The invention discloses a multi-gear injection mold, belonging to the technical field of gear molds, comprising a base, a top plate located above the base, a layer of upper mold plate and a multi-layer middle mold plate arranged between the top plate and the base, an upper mold core is installed on the upper mold core, the center of the upper mold core forms an upper flow channel, the upper end of the upper flow channel forms a gate, and the lower end of the upper flow channel forms a lower mold cavity, a middle mold core is installed on the middle mold core, a middle flow channel docking with the upper flow channel is formed in the center of the middle mold core, and the upper and lower ends of the middle flow channel form an upper mold cavity and a lower mold cavity respectively, and the lower mold cavity of the upper flow channel or the middle flow channel is combined with each corresponding upper mold cavity one by one to form a plurality of storage cavities; a rotating mold core is rotatably installed on the upper side of the middle mold core, and the center of the rotating mold core forms a molding cavity for helical gears, and the storage cavity is connected with the molding cavity through a shunt channel. The mold of the invention can be simultaneously applied to the injection molding of multiple gears, and the product coaxiality and precision are high, saving production costs.

Description

Technical Field

[0001] The invention belongs to the technical field of gear moulds, and in particular relates to an injection mould for multiple gears. Background Art

[0002] A mold is a tool used to make molded objects. The mold has a specific contour or inner cavity shape. The use of a contour shape with a cutting edge can separate the blank according to the contour shape. When designing a mold for multiple gears, it is not only necessary to design the mold to obtain the specific shapes of multiple gear products, but also to fully consider the possibility of affecting the coaxial accuracy during the process. Existing gear molds are usually only designed for the molding of a single gear or multiple horizontally parallel gears, and the coaxiality of the resulting multiple gears is low, which seriously affects the quality and production efficiency of the product. Summary of the invention

[0003] In view of this, an object of the present invention is to provide a multi-gear injection mold, which can be used for injection molding of multiple gears at the same time, and the product has high coaxiality and precision, saving production costs.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] The present invention discloses an injection mold for multiple gears, comprising a base, a top plate located above the base, a layer of upper template and multiple layers of middle templates arranged between the top plate and the base, wherein a vertical guide column is installed on the base, and the guide column sequentially passes through the guide holes provided on the middle templates and the upper templates of each layer and is connected to the top plate, and a clamping assembly for sequentially pressing the upper template and the middle template from top to bottom is installed on the lower side of the top plate, and a spacer demoulding assembly is arranged between two adjacent middle templates and between the middle template and the upper template; an upper mold core is installed on the upper template, and the upper mold core is installed on the upper mold core. An upper runner is formed at the center of the mold core, a gate is formed at the upper end of the upper runner, a lower mold cavity is formed at the lower end of the upper runner, a middle mold core is installed on the middle mold plate, a middle runner connected to the upper runner is formed at the center of the middle mold core, an upper mold cavity and a lower mold cavity are formed at the upper and lower ends of the middle runner respectively, the lower mold cavity of the upper runner or the middle runner is combined with each corresponding upper mold cavity to form a plurality of material storage cavities; a rotating mold core is rotatably installed on the upper side of the middle mold core, a molding cavity for the helical gear is formed at the center of the rotating mold core, and the material storage cavity is connected with the molding cavity through a branch runner.

[0006] Furthermore, an outer gear ring is provided on the outer side of the rotating mold core, the outer gear ring is meshed with the first spur gear, the first spur gear is meshed with the second spur gear, the first spur gear and the second spur gear are simultaneously rotatably arranged in a template rotation cavity opened on the middle template, the center thread of the second spur gear is connected with a first screw rod, the first screw rod is connected to a pull rod, the lower end of the pull rod is connected to a limiting plate, the limiting plate is rotatably installed in a limiting groove opened on the middle template, and the limiting plate on the upper middle template corresponds to the limiting groove on the adjacent lower middle template.

[0007] Furthermore, a slot is axially provided at the lower end of the pull rod, and the slot can be used for the upper end of the first screw rod to be inserted.

[0008] Furthermore, a plurality of protrusions are provided at the upper end of the middle mold core, and the protrusions extend into the molding cavity. The protrusions are formed on a concentric circle centered on the middle flow channel, and a spacing groove is formed between two adjacent protrusions.

[0009] Furthermore, a straight hole extending along the vertical direction is opened on the protrusion, and a top block is slidably arranged in the straight hole. The lower end of the top block is fixedly connected to a second screw rod, and the second screw rod is connected to the center thread of the third spur gear. The third spur gear is meshed with a fourth spur gear. The third spur gear and the fourth spur gear simultaneously rotate a mold core rotating cavity opened on the middle mold core, and the fourth spur gear is meshed with an inner gear ring arranged on the inner side of the rotating mold core.

[0010] Furthermore, an upper pouring column is fixed at the center of the upper mold core, and a vertical upper flow channel is opened at the center of the upper pouring column, and the inner diameter of the upper flow channel gradually increases from top to bottom.

[0011] Furthermore, a middle pouring column is fixed at the center of the middle mold core, and a vertically arranged middle flow channel is opened at the center of the middle pouring column.

[0012] Furthermore, the spacer demoulding assembly includes a spring, and the spring is sleeved on the outside of the guide column, and the two ends of the spring are respectively connected to the middle template or the upper template adjacent to the spring.

[0013] Furthermore, the clamping assembly includes a hydraulic cylinder fixed on the top plate, the output end of the hydraulic cylinder is vertically connected downward to the upper template, and the upper template is provided with a receiving groove for the hydraulic cylinder to make way.

[0014] The beneficial effects of the present invention are:

[0015] The invention discloses a multi-gear injection mold, which has multiple molding cavities formed in the vertical direction, so that multiple helical gears can be simultaneously injected and molded, thereby greatly improving production efficiency and saving production costs. In addition, multiple helical gears are arranged on the same vertical axis, and the coaxiality during unified processing can be ensured by a guide column, thereby improving the coaxiality and precision of the product.

[0016] In the device disclosed in the present invention, the guide column passes through multiple middle mold plates at the same time. After the clamping assembly is loosened, the interval demoulding assembly can drive each middle mold plate to be spaced at a certain distance, which is convenient for demoulding of the gear. Multiple gears can be cast through one gate, which is easy to operate and greatly improves the production efficiency of the gear.

[0017] In the device disclosed in the present invention, by unifying the standards of the middle mold plate and the middle mold core, it can be suitable for the processing of a larger number of gears, which not only facilitates the maintenance of the mold, but also greatly reduces the production cost, and the gears produced have higher consistency.

[0018] Other advantages, objectives and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art may be taught from the practice of the present invention. The objectives and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration:

[0020] Figure 1 It is a structural schematic diagram of the injection mold of the present invention;

[0021] Figure 2 is a cross-sectional view of the template in the present invention;

[0022] Figure 3 for Figure 2 The enlarged view of point A in the middle;

[0023] Figure 4 for Figure 2 The enlarged view of point B in the middle;

[0024] Figure 5 It is the structural diagram of the middle mold core;

[0025] Figure 6 It is a structural schematic diagram of the rotary mold core.

[0026] The markings in the accompanying drawings are as follows: base 1, top plate 2, upper template 3, middle template 4, guide column 5, guide hole 6, clamping assembly 7, upper mold core 8, upper runner 9, gate 10, upper mold cavity 11, middle mold core 12, middle runner 13, lower mold cavity 14, storage cavity 15, rotating mold core 16, forming mold cavity 17, branch channel 18, outer gear ring 19, first spur gear 20, second spur gear 21, template rotation cavity 22, first screw 23, pull rod 24, limit plate 25, limit groove 26, slot 27, protrusion 28, spacing groove 29, straight hole 30, top block 31, second screw 32, third spur gear 33, fourth spur gear 34, mold core rotation cavity 35, inner gear ring 36, upper pouring column 37, middle pouring column 38, spring 39, accommodating groove 40. DETAILED DESCRIPTION

[0027] like Figures 1 to 6 As shown, the present invention discloses a multi-gear injection mold, comprising a base 1, a top plate 2 located above the base 1, a layer of upper template 3 and a multi-layer middle template 4 arranged between the top plate 2 and the base 1, and the base 1 and the top plate 2 are both plate-shaped. In this embodiment, there are three templates 4. Those skilled in the art can understand that according to the number of helical gears required for the column, more middle templates 4 can be set along the vertical direction, and the middle templates 4 correspond to the number of products one by one.

[0028] In some other embodiments, a layer of upper mold plate 3 may be provided with multiple groups of helical gear mold cavities in the horizontal direction, and each group corresponds to three vertical molding mold cavities 17, which can be set according to needs.

[0029] The base 1 is located at the bottom of the entire injection mold and is used to support the entire injection mold. It can be understood that the base can be a support platform, and its area is larger than the area of ​​the middle template 4, so as to provide good support for the bottom of the middle template. The top plate 2 is located at the top of the mold and is used to provide reaction force support for the clamping assembly 7, so that the clamping assembly 7 can work conveniently.

[0030] The upper template 3 is located on the side close to the top plate 2, and from top to bottom are the top plate 2, the upper template 3, the three-layer middle template 4 and the base 1. During injection molding, the clamping component 7 presses the upper template 3 against the middle template 4 from top to bottom. After molding, the clamping component 7 is released, and the spacing demolding component can drive each middle template 4 to be spaced a certain distance apart. The spacing is at least greater than the thickness of a helical gear, which facilitates the demolding of the gear.

[0031] Among them, a vertical guide column 5 is installed on the base 1, and the cross-section of the guide column 5 is circular. Of course, the cross-section of the guide column 5 can be set as needed, but overall, the surface of the guide column 5 needs to slide with the guide hole 6, thereby avoiding deflection of the middle template or the upper template.

[0032] The guide column 5 passes through the guide holes 6 opened on the middle template 4 and the upper template 3 of each layer in sequence and is connected to the top plate 2. A clamping assembly 7 for sequentially pressing the upper template 3 and the middle template 4 from top to bottom is installed on the lower side of the top plate 2. The clamping assembly 7 can sequentially press the upper template 3 to the middle template 4 from top to bottom, and then press the middle template 4 to the base 1. The guide column 5 plays a guiding role. The surface of the guide column 5 is smooth enough to slide with the guide hole 6 to ensure that the movement direction of the upper template 3 and the lower template is along the vertical direction.

[0033] Specifically, a spacing demoulding assembly is provided between two adjacent middle templates 4 and between the middle template 4 and the upper template 3, and the spacing demoulding assembly is used to drive each middle template 4 to be spaced at a certain distance to facilitate demoulding; an upper mold core 8 is installed on the upper template 3, and the upper mold core 8 is located at the lower center of the upper template 3. The center of the upper mold core 8 forms a vertically extending upper runner 9, and the upper end of the upper runner 9 forms a gate 10, and the lower end of the upper runner 9 forms a lower mold cavity 14. A middle mold core 12 is installed at the upper center of the middle template 4, and the center of the middle mold core 12 forms a middle mold core 12 that is connected to the upper runner 9. The flow channel 13, each middle flow channel 13 is connected in sequence in the vertical direction, and the upper and lower ends of the middle flow channel 13 respectively form an upper mold cavity 11 and a lower mold cavity 14, and the lower mold cavity 14 of the upper flow channel 9 or the middle flow channel 13 is combined with each upper mold cavity 11 to form a plurality of storage cavities 15; specifically, the lower mold cavity 14 of the upper flow channel 9 and the upper mold cavity 11 of the first layer of the middle flow channel 13 form a storage cavity 15, the lower mold cavity 14 of the first layer of the middle flow channel 13 and the upper mold cavity 11 of the second layer of the middle flow channel 13 form a storage cavity 15, and so on, forming three storage cavities 15.

[0034] The number of the material storage cavities 15 corresponds to the number of the helical gear products. It can be understood that different numbers of the middle mold cores 4 naturally correspond to different numbers of the material storage cavities 15 .

[0035] Specifically, a rotating mold core 16 is rotatably installed on the upper side of the middle mold core 12. The rotating mold core 16 can rotate around its central axis on the inner side of the middle mold core 12. The center of the rotating mold core 16 forms a molding cavity 17 for the helical gear. It can be understood that the molding cavity 17 corresponds to the storage cavity 15 one by one, and the storage cavity 15 is connected to the molding cavity 17 through the branch channel 18. When the gear is cast through the gate 10, the slurry enters each storage cavity 15 through the main channel and the middle channel 13, and then enters the molding cavity 17 through the branch channel 18 opened on the storage cavity 15 for molding the gear. The present invention can realize the casting of multiple gears through one gate 10, which is easy to operate and greatly improves the production efficiency of the gear.

[0036] In this embodiment, an outer gear ring 19 is provided on the outer side of the rotating mold core 16, and the outer gear ring 19 meshes with the first spur gear 20. The axis of the first spur gear 20 is parallel to the axis of the rotating mold core 16. The first spur gear 20 meshes with the second spur gear 21. The meshing of the first spur gear 20 and the second spur gear 21 realizes speed change to meet the speed requirement. More speed change mechanisms can also be provided between the first spur gear 20 and the second spur gear 21 as needed. Among them, the first spur gear 20 and the second spur gear 21 are simultaneously rotatably arranged in the template rotation cavity 22 opened on the middle template 4, and the center thread of the second spur gear 21 is connected with the first screw rod 23, and the first screw rod 23 is connected to the pull rod 24. The lower end of the pull rod 24 is connected to the limit plate 25, and the limit plate 25 is rotatably installed in the limit groove 26 opened on the middle template 4. The limit plate 25 located on the upper middle template 4 corresponds to the limit groove 26 on the adjacent lower middle template 4.

[0037] In some other embodiments, the rotating mold core 16 and the limiting plate 25 may also adopt other linkage mechanisms, the purpose of which is to ensure that when relative movement occurs between two adjacent middle mold plates 4, the limiting plate 25 can indirectly act on the rotating mold core 16, so that the rotating mold core 16 actively rotates to reduce the demoulding pressure of the bevel gear. Because the bevel gear needs to drive the rotating mold core 16 to rotate during demoulding, the above-mentioned active mechanism drives the rotating mold core 16 to rotate, which, to a certain extent, makes more efficient use of force and reduces the demoulding difficulty of the bevel gear.

[0038] It should be noted that the inner side of the rotating mold core 16 is provided with an internal helical gear structure for the outer shape of the helical gear. When the helical gear is demolded, the helical gear needs to be ejected outward along the axial direction. At this time, the helical gear does not rotate, and the rotating mold core 16 matched with it rotates, thereby realizing the separation of the helical gear and the rotating mold core 16. When the interval demolding assembly is started, the action of the interval demolding assembly causes a relative displacement between the two adjacent middle mold plates 4. At this time, the limit groove 26 can limit the axial movement of the limit plate 25. The limit plate 25 pulls the first screw 23 to move along the axial direction. After the relative displacement between the first screw 23 and the second spur gear 21 occurs, it can drive the second spur gear 21 to rotate. The second spur gear 21 drives the rotating mold core 16 to rotate through the first spur gear 20. The direction of this rotation is consistent with the direction of rotation when the helical gear drives the rotating mold core 16 to rotate when demolding. Therefore, the force that drives the rotating mold core 16 to rotate when demolding through the interval demolding assembly helps the demolding of the product and reduces the demolding difficulty of the helical gear.

[0039] In this embodiment, a slot 27 is provided at the lower end of the pull rod 24 along the axial direction, and the slot 27 can be inserted into the upper end of the first screw rod 23 to prevent interference between the pull rod 24 and the first screw rod 23, and the overall structural design is more compact. The purpose of the slot 27 is to allow the first screw rod 23 to be inserted. Of course, other giving way mechanisms can also be provided as needed, such as a method of misaligning the upper and lower first screw rods 23, thereby also preventing interference.

[0040] In this embodiment, a plurality of protrusions 28 are provided at the upper end of the middle mold core 12, and the protrusions 28 extend into the molding cavity 17. The protrusions 28 are formed on a concentric circle centered on the middle flow channel 13, and a spacing groove 29 is formed between two adjacent protrusions 28. The cross section of the protrusion 28 is trapezoidal, or it can be rectangular or other polygonal shapes. However, the protrusion direction of the protrusion 28 is along the vertical direction. Under the limiting effect of the protrusion 29, the product can be kept from rotating during the demolding process, reducing the demolding pressure.

[0041] In some other embodiments, the shape of the protrusion 28 may also be cylindrical. By extending the protrusion 28 into the molding cavity of the gear, after the helical gear is formed, it can also play a certain limiting role on the circumferential direction of the helical gear.

[0042] In some other embodiments, other supporting mechanisms are also provided on the protrusion 28, and the supporting mechanisms can be used to assist in demolding the bevel gear when the rotating mold core 16 rotates. After the rotating mold core 16 rotates, the top block 31 in the protrusion can vertically lift the bevel gear in the vertical direction under the linkage of the supporting mechanism, thereby reducing the difficulty of demolding.

[0043] In this embodiment, a straight hole 30 extending in the vertical direction is provided on the protrusion 28, and a top block 31 is slidably provided in the straight hole 30. The top block 31 is cylindrical, and its surface is slidably matched with the straight hole 30 through a keyway. A second screw 32 is fixedly connected to the lower end of the top block 31, and the second screw 32 is connected to the central thread of the third spur gear 33, and the third spur gear 33 is meshed with the fourth spur gear 34. The third spur gear 33 and the fourth spur gear 34 simultaneously rotate the mold core rotating cavity 35 provided on the middle mold core 12, and the fourth spur gear 34 is meshed with the inner gear ring 36 provided on the inner side of the rotating mold core 16. By adopting the above method, the bevel gear can be vertically lifted to reduce the difficulty of demoulding.

[0044] In this embodiment, an upper pouring column 37 is fixed at the center of the upper mold core 8, and a vertical upper flow channel 9 is opened at the center of the upper pouring column 37. The inner diameter of the upper flow channel 9 gradually increases from top to bottom, and the lower space gradually increases, which can make the pouring of the slurry smoother, reduce the generation of bubbles, and reduce defects inside the product.

[0045] In this embodiment, a middle casting column 38 is fixed at the center of the middle mold core 12, and a vertical middle flow channel 13 is opened at the center of the middle casting column 38. By setting a detachable middle casting, maintenance and residue cleaning can be facilitated, thereby improving the product qualification rate.

[0046] In this embodiment, the spacing demolding assembly includes a spring 39, which is sleeved on the outside of the guide column 5. The two ends of the spring 39 are respectively connected to the middle template 4 or the upper template 3 adjacent to the spring 39. The supporting force of each spring 39 is adjusted as needed so that the two adjacent middle templates 4 can obtain the same spacing after support, which is convenient for product demolding.

[0047] In some other embodiments, the spring 39 may also be other elastic support devices, such as an elastic sleeve, etc. By arranging the elastic sleeve on the outside of the guide column 5, it can also provide elastic support when the hydraulic cylinder is unloaded. Of course, an active support device may also be used, such as installing a hydraulic cylinder between two adjacent middle mold plates, so as to achieve active interval demoulding. Of course, this method may also have the problem of inconvenient control.

[0048] In this embodiment, the clamping assembly 7 includes a hydraulic cylinder fixed on the top plate 2, and the output end of the hydraulic cylinder is vertically connected to the upper template 3 downward. The upper template 3 is provided with a receiving groove 40 for the hydraulic cylinder to make way, so as to make the whole device more compact.

[0049] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A multi-gear injection mold, characterized in that: The invention comprises a multi-layer middle template (4), an upper template (3) located above the middle template (4), a pressing assembly (7) being arranged above the upper template (3), and a spacing demoulding assembly being arranged between two adjacent middle templates (4) and between the middle template (4) and the upper template (3); an upper mold core (8) being installed on the upper template (3), an upper flow channel (9) being formed at the center of the upper mold core (8), a lower mold cavity (14) being formed at the lower end of the upper flow channel (9), a middle mold core (12) being installed on the middle template (4), a middle flow channel (9) being formed at the center of the middle mold core (12) and being connected to the upper flow channel (9). The middle flow channel (13) is provided with a middle flow channel (13), the upper and lower ends of the middle flow channel (13) respectively form an upper mold cavity (11) and a lower mold cavity (14), the lower mold cavity (14) of the upper flow channel (9) or the middle flow channel (13) and each upper mold cavity (11) are combined one by one to form a plurality of material storage cavities (15); a rotating mold core (16) is rotatably mounted on the upper side of the middle mold core (12), the center of the rotating mold core (16) forms a molding cavity (17) for the helical gear, and the material storage cavity (15) is connected to the molding cavity (17) through a branch flow channel (18); the mold further comprises a base (1), a top mold core (11) located above the base (1), and a mold core (16) disposed on the upper side of the middle mold core (12). The top plate (2) is provided with an upper mold plate (3) and a multi-layer middle mold plate (4) between the top plate (2) and the base (1); a vertical guide column (5) is installed on the base (1); the guide column (5) sequentially passes through the guide holes (6) provided on the middle mold plates (4) and the upper mold plate (3) of each layer and is connected to the top plate (2); a gate (10) is formed at the upper end of the upper runner (9); an outer gear ring (19) is provided on the outer side of the rotating mold core (16); the outer gear ring (19) is meshed with a first spur gear (20); the first spur gear (20) is meshed with a second spur gear (21) The first spur gear (20) and the second spur gear (21) are simultaneously rotatably arranged in a template rotation cavity (22) opened on the middle template (4); the center thread of the second spur gear (21) is connected to a first screw rod (23); the first screw rod (23) is connected to a pull rod (24); the lower end of the pull rod (24) is connected to a limit plate (25); the limit plate (25) is rotatably installed in a limit groove (26) opened on the middle template (4); the limit plate (25) located on the upper middle template (4) corresponds to the limit groove (26) on the adjacent lower middle template (4).

2. The multi-gear injection mold according to claim 1, characterized in that: The lower end of the pull rod (24) is provided with a slot (27) along the axial direction, and the slot (27) can be used for the upper end of the first screw rod (23) to be inserted.

3. The multi-gear injection mold according to claim 2, characterized in that: A plurality of protrusions (28) are provided at the upper end of the middle mold core (12), the protrusions (28) extending into the molding cavity (17), the protrusions (28) being formed on a concentric circle centered on the middle flow channel (13), and a spacing groove (29) being formed between two adjacent protrusions (28).

4. The multi-gear injection mold according to claim 3, characterized in that: The protrusion (28) is provided with a straight hole (30) extending in the vertical direction, a top block (31) is slidably arranged in the straight hole (30), a second screw rod (32) is fixedly connected to the lower end of the top block (31), the second screw rod (32) is connected to the center thread of a third spur gear (33), the third spur gear (33) is meshed with a fourth spur gear (34), the third spur gear (33) and the fourth spur gear (34) simultaneously rotate a mold core rotating cavity (35) provided on the middle mold core (12), and the fourth spur gear (34) is meshed with an inner gear ring (36) provided on the inner side of the rotating mold core (16).

5. The multi-gear injection mold according to claim 1, characterized in that: An upper pouring column (37) is fixed at the center of the upper mold core (8), and a vertical upper flow channel (9) is opened at the center of the upper pouring column (37), and the inner diameter of the upper flow channel (9) gradually increases from top to bottom.

6. The multi-gear injection mold according to claim 1, characterized in that: A middle casting column (38) is fixed at the center of the middle mold core (12), and a vertically arranged middle flow channel (13) is opened at the center of the middle casting column (38).

7. The multi-gear injection mold according to claim 1, characterized in that: The spacing demoulding assembly comprises a spring (39), wherein the spring (39) is sleeved on the outside of the guide column (5), and the two ends of the spring (39) are respectively connected to the middle mold plate (4) or the upper mold plate (3) adjacent to the spring (39).

8. The multi-gear injection mold according to claim 1, characterized in that: The clamping assembly (7) comprises a hydraulic cylinder fixed on the top plate (2), the output end of the hydraulic cylinder being vertically connected downward to the upper template (3), and a receiving groove (40) for the hydraulic cylinder to make way is provided on the upper template (3).

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