Lost foam mould of gearbox shell

Abstract

The utility model discloses an evanescent mode mould of a gearbox shell. The evanescent mode mould comprises a first mould and a second mould, the first mold comprises a first top mold, a first middle mold and a first bottom mold, a plurality of movable core blocks are arranged on the first bottom mold, and each movable core block is in sliding connection with the first bottom mold through a driving piece; the second die comprises a second top die, a second middle die and a second bottom die which are sequentially arranged from top to bottom, a plurality of movable core blocks are arranged on the second bottom die, and each movable core block is in sliding connection with the second bottom die through a driving piece. According to the evanescent mode mold of the gearbox shell, the multiple movable core blocks are driven by the corresponding air cylinders to move in a reciprocating mode, so that automatic mold opening and closing of hole type, irregular groove type and protrusion type structures in a cavity are achieved, the movable core blocks do not need to be manually dug out of a formed product, and demolding is not needed; and the conditions of scratching, scratching or partial loss and the like of the formed product are avoided, time and labor are saved, and the surface quality of the formed product is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lost foam molds, in particular to a lost foam mold of a gearbox housing. Background Art

[0002] The lost foam mold is a tool that is widely used in industrial practice. Its principle is to form a shell mold, then pour plastic foam and other materials into the inside of the mold, and wait for cooling and molding to form a lost foam mold of the required specific shape. This plastic foam type model can also be further used for subsequent actual product processing and manufacturing.

[0003] The gearbox housing is a housing structure for installing the transmission mechanism of the transmission and its accessories. The shape of the gearbox housing is relatively complex. A through hole for passing the transmission shaft is provided on the housing. The internal cavity is provided with various irregularly shaped protrusions, grooves and multiple ribs, and holes are provided on the ribs. Due to the complexity and particularity of the shape of the gearbox housing, the existing lost foam mold of the gearbox housing often sets a movable core block at the position with holes, grooves and protrusions. After the mold is opened, the movable core block is still stuck in the hole of the molded product, which requires the operator to manually remove the movable core block from the molded product and remove it. When removing the movable core block, it is easy to damage the molded product of the plastic foam. The molded product may be scratched or scratched, or part of the product may be missing and fall off, making it difficult to ensure the quality of the molded product. In addition, the production method of manually removing the mold for the movable core block is time-consuming and labor-intensive, which is not conducive to production. Utility Model Content

[0004] In view of the above problems, the purpose of the utility model is to provide a lost foam mold for a gearbox housing, so as to solve the problem that the movable core blocks provided in the existing lost foam mold for the gearbox housing are manually demolded, which easily scratches or scratches the molded product or causes partial loss of the product during demolding and cannot guarantee the surface quality of the molded product, and the manual demolding process is time-consuming and labor-intensive.

[0005] The utility model is achieved in this way:

[0006] A lost foam mold for a gearbox housing comprises a first mold for producing an upper housing and a second mold for producing a lower housing, wherein the upper housing and the lower housing are combined to form the gearbox housing; the first mold comprises a first top mold, a first middle mold and a first bottom mold which are sequentially arranged from top to bottom, a plurality of movable core blocks are arranged on the first bottom mold, and each movable core block is slidably connected to the first bottom mold through a driving member; the second mold comprises a second top mold, a second middle mold and a second bottom mold which are sequentially arranged from top to bottom, a plurality of movable core blocks are arranged on the second bottom mold, and each movable core block is slidably connected to the second bottom mold through a driving member.

[0007] Furthermore, the first top mold covers the top of the first middle mold, and a plurality of first lifting cylinders are fixedly provided on the peripheral side of the first middle mold. The plurality of first lifting cylinders are vertically arranged downward, and the movable ends of the first lifting cylinders are fixedly connected to the first bottom mold.

[0008] Furthermore, the first top mold has a first cavity with a bottom opening, two first sliders are slidably arranged in the first cavity, two first cylinders are fixedly arranged on the outer side of the side wall of the first top mold, and the movable ends of the two first cylinders are respectively fixedly connected to the corresponding first sliders.

[0009] Furthermore, a plurality of second sliders are provided on the first middle mold, and the plurality of second sliders are all horizontally slidably connected to the first middle mold, and the plurality of second sliders are all inclined wedge structures with an upper dimension larger than a lower dimension.

[0010] Furthermore, a plurality of first fixed core blocks are provided on the top of the first bottom mold, and a plurality of second sliding blocks are vertically slidably connected to the corresponding first fixed core blocks respectively. A first movable core block and a second movable core block are also provided on the first bottom mold. The first movable core block is horizontally slidably connected to the first bottom mold through a second cylinder, and the second movable core block is slidably connected to the first bottom mold along an inclined surface through a third cylinder.

[0011] Furthermore, the second top mold covers the top of the second middle mold, and a plurality of second lifting cylinders are fixedly provided on the peripheral side of the second middle mold. The plurality of second lifting cylinders are vertically arranged downward, and the movable ends of the second lifting cylinders are fixedly connected to the second bottom mold.

[0012] Furthermore, the second top mold has a second cavity with a bottom opening, a third slider is slidably arranged in the second cavity, a fourth cylinder is fixedly arranged on the outer side of the side wall of the second top mold, and the movable end of the fourth cylinder is fixedly connected to the third slider.

[0013] Furthermore, a plurality of fourth sliders are provided on the second middle mold, and the plurality of fourth sliders are all horizontally slidably connected to the second middle mold, and the plurality of fourth sliders are all inclined wedge structures with an upper dimension larger than a lower dimension.

[0014] Furthermore, a plurality of second fixed core blocks are provided on the top of the second bottom mold, and a plurality of fourth sliding blocks are vertically slidably connected to the corresponding second fixed core blocks respectively. A third movable core block, a fourth movable core block and a fifth movable core block are also provided on the second bottom mold. The third movable core block and the fourth movable core block are horizontally slidably connected to the second bottom mold respectively through the fifth cylinder and the sixth cylinder, and the fifth movable core block is slidably connected to the second bottom mold along the inclined surface through the seventh cylinder.

[0015] The beneficial effects of the utility model are:

[0016] The utility model discloses a lost foam mold for a gearbox housing, wherein a first mold is provided for producing an upper housing of the gearbox housing, and a second mold is provided for producing a lower housing of the gearbox housing, and the upper housing and the lower housing are bonded and fixed to form a complete gearbox housing; a plurality of movable core blocks are provided which reciprocate under the drive of corresponding cylinders, respectively, so as to realize automatic opening and closing of the molds of the hole-like, irregular groove-like and protrusion-like structures in the cavity, and there is no need to manually pick out and demold the movable core blocks from the molded product, so as to avoid scratches, scratches or partial missing of the molded product, thereby saving time and labor and improving the surface quality of the molded product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the first mold of the utility model when the mold is closed;

[0018] Figure 2 This is an exploded view of the first mold of the utility model;

[0019] Figure 3 It is a three-dimensional structural schematic diagram of the first top mold of the utility model;

[0020] Figure 4 It is a three-dimensional structural schematic diagram of the first middle mold and the upper shell of the utility model;

[0021] Figure 5 It is a three-dimensional structural schematic diagram of the first bottom mold of the utility model;

[0022] Figure 6 It is a schematic diagram of the three-dimensional structure of the second mold of the utility model when the mold is closed;

[0023] Figure 7 This is an exploded view of the second mold of the utility model;

[0024] Figure 8 It is a schematic diagram of the three-dimensional structure of the second top mold of the utility model;

[0025] Fig. 9 It is a three-dimensional structural schematic diagram of the second middle mold and the lower shell of the utility model;

[0026] Fig.10 It is a schematic diagram of the three-dimensional structure of the second bottom mold of the utility model;

[0027] Fig.11 It is a schematic diagram of the installation of the third movable core block, the fourth movable core block, the fifth movable core block and the fixed core block in the second bottom mold of the utility model;

[0028] Fig.12 It is a combined diagram of the upper shell and the lower shell of the utility model.

[0029] Description of reference numerals:

[0030] 1. first mold; 11. first top mold; 111. first cavity; 112. first slider; 113. first cylinder;

[0031] 12, first intermediate mold; 120, guide groove; 121, first lifting cylinder; 122, second slide block; 1221, first inclined surface; 1222, guide rail;

[0032] 13, first bottom mold; 131, first fixed core block; 1311, second inclined surface; 132, first movable core block; 133, second movable core block; 134, second cylinder; 135, third cylinder;

[0033] 2. Second mold; 21. Second top mold; 211. Second cavity; 212. Third slider; 213. Fourth cylinder;

[0034] 22, second intermediate mold; 221, second lifting cylinder; 222, fourth slide block; 2221, third inclined surface;

[0035] 23, second bottom mold; 231, second fixed core block; 2311, fourth inclined plane; 232, third movable core block; 233, fourth movable core block; 234, fifth movable core block; 235, fifth cylinder; 236, sixth cylinder; 237, seventh cylinder;

[0036] 3. Upper shell; 4. Lower shell. DETAILED DESCRIPTION

[0037] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0038] like Figures 1 to 12The utility model shows a lost foam mold of a gearbox housing, including a first mold 1 for producing an upper housing 3 and a second mold 2 for producing a lower housing 4, wherein the upper housing 3 and the lower housing 4 form a gearbox housing; the first mold 1 includes a first top mold 11, a first middle mold 12 and a first bottom mold 13 arranged in sequence from top to bottom, and a plurality of movable core blocks are arranged on the first bottom mold 13, and each movable core block is slidably connected to the first bottom mold 13 through a driving member; the second mold 2 includes a second top mold 21, a second middle mold 22 and a second bottom mold 23 arranged in sequence from top to bottom, and a plurality of movable core blocks are arranged on the second bottom mold 23, and each movable core block is slidably connected to the second bottom mold 23 through a driving member. It should be noted that the driving member in this embodiment is a cylinder, but it can also be a hydraulic cylinder, an electro-hydraulic push rod or other mechanism with automatic telescopic function, which is not limited here.

[0039] like Fig.12 The figure shows a three-dimensional structure diagram of the upper shell 3 and the lower shell 4 when they are combined together. The upper shell 3 and the lower shell 4 are combined to form a complete gearbox housing. A rib plate is provided inside the gearbox housing, and holes of different shapes are opened on the rib plate. Irregular protrusions or grooves are also provided inside the gearbox housing.

[0040] like Figure 1 As shown, the state of the first top mold 11, the first middle mold 12 and the first bottom mold 13 in the first mold 1 is closed, and the cavity enclosed by the first top mold 11, the first middle mold 12 and the first bottom mold 13 is consistent with the shape and size of the upper shell 3. Figure 2 It is an exploded view of the first mold 1 , in which a first top mold 11 , a first middle mold 12 and a first bottom mold 13 are arranged in sequence from top to bottom.

[0041] like Figure 1 to Figure 3As shown, the first mold 1 includes a first top mold 11, a first middle mold 12 and a first bottom mold 13 which are arranged in sequence from top to bottom. The first top mold 11 covers the top of the first middle mold 12, and the first top mold 11 is movably connected to the first middle mold 12. When the first mold 1 is closed, the first top mold 11 covers the top of the first middle mold 12 and is tightly connected thereto. When the first mold 1 is opened, the first top mold 11 is moved upward and removed from the top of the first middle mold 12. The first top mold 11 has a first cavity 111 with a bottom opening, and the shape and size of the first cavity 111 are adapted to the outer wall of the upper shell 3. Two first sliders 112 are slidably arranged in the first cavity 111. In this embodiment, the two first sliders 112 are slidably arranged on two opposite side walls of the first top mold 11, respectively. Two first cylinders 113 are fixedly arranged on the outer side of the side wall of the first top mold 11. The two first cylinders 113 are arranged horizontally, and the movable ends of the two first cylinders 113 are fixedly connected to the corresponding first sliders 112, respectively. The two first cylinders 113 extend and retract to drive the first slider 112 fixed to the movable end to slide in the horizontal direction to complete mold opening and mold closing. Specifically, the first cylinder 113 extends to drive the first slider 112 to move to the center of the first cavity 111, thereby realizing the mold closing action; the first cylinder 113 contracts to drive the first slider 112 to move away from the center of the first cavity 111, thereby realizing the mold opening action. Driven by the first cylinder 113, the first slider 112 realizes automatic mold opening and closing, saving time and effort.

[0042] A plurality of first lifting cylinders 121 are fixedly provided on the peripheral side of the first intermediate mold 12. The plurality of first lifting cylinders 121 are arranged vertically downward, and the movable ends of the first lifting cylinders 121 are fixedly connected to the first bottom mold 13. In this embodiment, the number of the first lifting cylinders 121 is four, and the four first lifting cylinders 121 are fixedly arranged on two opposite side walls of the first intermediate mold 12. The first lifting cylinders 121 extend and push the first intermediate mold 12, so that the first intermediate mold 12 slides in the vertical direction relative to the first bottom mold 13. When the first lifting cylinders 121 are extended, the first intermediate mold 12 moves upward under the push of the first lifting cylinders 121, and is separated from the first bottom mold 13 and has a certain distance. When the first lifting cylinders 121 are contracted, the first intermediate mold 12 moves downward under the drive of the first lifting cylinders 121 until it contacts the first bottom mold 13, thereby completing the mold closing of the first intermediate mold 12 and the first bottom mold 13.

[0043] like Figure 4As shown, the first intermediate mold 12 is provided with a plurality of second sliders 122, and the plurality of second sliders 122 are all horizontally slidably connected with the first intermediate mold 12, and the plurality of second sliders 122 are all inclined wedge structures with the upper size larger than the lower size, and the second slider 122 has an inclined first inclined surface 1221, and the first inclined surface 1221 forms an acute angle with the vertical direction. In this embodiment, the number of the second sliders 122 is four, and guide rails 1222 are fixed on the bottom and the first inclined surface 1221 of the four second sliders 122, and the guide rails 1222 arranged at the bottom slide in the guide groove 120 arranged at the top of the first intermediate mold 12, and the guide rails 1222 and the guide groove 120 are preferably dovetail groove structures, and can also be other cross-sectional shapes. The guide rails 1222 arranged at the bottom of the second slider 122 cooperate with the guide groove 120 at the top of the first intermediate mold 12 and play a guiding role, ensuring that the second slider 122 slides horizontally on the first intermediate mold 12.

[0044] like Figure 5 As shown, a plurality of first fixed core blocks 131 are provided on the top of the first bottom mold 13, and a plurality of second sliders 122 are respectively connected to the corresponding first fixed core blocks 131 in a vertical sliding manner. The four second sliders 122 are respectively inserted between the first fixed core blocks 131, and the first fixed core block 131 is provided with a second inclined surface 1311, which is arranged corresponding to the first inclined surface 1221. When the first bottom mold 13 and the first intermediate mold 12 are closed, the first inclined surface 1221 and the second inclined surface 1311 are in contact. A guide groove 120 is correspondingly provided on the second inclined surface 1311, and the shape and size of the guide groove 120 are adapted to the guide rail 1222 arranged on the first inclined surface 1221, so as to play a guiding and positioning role, and ensure that the positional relationship between each second slider 122 and each first fixed core block 131 is relatively fixed. When the first bottom mold 13 and the first intermediate mold 12 are in the mold-closing state, the second slider 122 and the first fixed core block 131 are tightly connected by the first inclined surface 1221 and the second inclined surface 1311 abutting against each other. When the first bottom mold 13 and the first intermediate mold 12 are demoulded, when the first intermediate mold 12 moves upward under the drive of the first lifting cylinder 121 and gradually separates from the first bottom mold 13, the distance between the first inclined surface 1221 of the second slider 122 and the second inclined surface 1311 of the first fixed core block 131 gradually increases as the demoulding continues, making it easier to separate the two and facilitating the subsequent demoulding action.

[0045] The first bottom mold 13 is provided with a first movable core block 132 and a second movable core block 133. The first movable core block 132 is a cylindrical structure and is used to form a circular hole in the upper shell 3. The second movable core block 133 is a special-shaped shape and is used to form an irregular hole in the upper shell 3. The first movable core block 132 is horizontally slidably connected to the first bottom mold 13 through the second cylinder 134, and the second movable core block 133 is slidably connected to the first bottom mold 13 along the inclined surface through the third cylinder 135. The second cylinder 134 and the third cylinder 135 are both fixed on the first fixed core block 131, that is, the fixed ends of the second cylinder 134 and the third cylinder 135 are both fixedly connected to the first fixed core block 131, and the movable ends of the second cylinder 134 and the third cylinder 135 are respectively fixedly connected to the first movable core block 132 and the second movable core block 133. The extension and contraction of the second cylinder 134 and the third cylinder 135 respectively drive the first movable core block 132 and the second movable core block 133 fixedly connected to their movable ends to move synchronously. Among them, the second cylinder 134 is arranged horizontally and drives the first movable core block 132 to move back and forth in the horizontal direction to realize the automatic mold opening and closing of the first movable core block 132 and the first fixed core block 131. The third cylinder 135 is arranged obliquely and drives the second movable core block 133 to move back and forth in an inclined direction to realize the automatic mold opening and closing between the second movable core block 133 and the first fixed core block 131. The first movable core block 132 and the second movable core block 133 move back and forth under the drive of the second cylinder 134 and the third cylinder 135 respectively, thereby realizing the automatic mold opening and closing of the hole-type forming mold, without the need to manually pick out and demold the movable core block from the formed product, avoiding scratches, scratches or partial loss of the formed product, which saves time and labor and improves the surface quality of the formed product.

[0046] like Figure 6 As shown in FIG. 2 , the second top mold 21, the second middle mold 22 and the second bottom mold 23 in the second mold 2 are in a closed state, and the cavity enclosed by the second top mold 21, the second middle mold 22 and the second bottom mold 23 is consistent with the shape and size of the lower shell 4. Figure 7 The exploded view of the second mold 2 is shown, in which the second top mold 21, the second middle mold 22 and the second bottom mold 23 are arranged in sequence from top to bottom.

[0047] like Figure 6 to Figure 8, the second top mold 21 covers the top of the second middle mold 22, and the second top mold 21 is movably connected to the second middle mold 22. When the second mold 2 is closed, the second top mold 21 covers the top of the second middle mold 22 and is tightly connected thereto. When the second mold 2 is opened, the second top mold 21 is moved upward and removed from the top of the second middle mold 22. The second top mold 21 has a second cavity 211 with a bottom opening, and the shape and size of the second cavity 211 are adapted to the outer wall of the lower shell 4. A third slider 212 is slidably provided in the second cavity 211, and a fourth cylinder 213 is fixedly provided on the outer side of the side wall of the second top mold 21, and the fourth cylinder 213 is horizontally arranged, and the movable end of the fourth cylinder 213 is fixedly connected to the third slider 212. The fourth cylinder 213 is extended and retracted to drive the third slider 212 fixedly connected to its movable end to slide in the horizontal direction to complete mold opening and mold closing. Specifically, the fourth cylinder 213 is extended to drive the third slider 212 to move to a position close to the center of the second cavity 211, thereby realizing the mold closing action; the fourth cylinder 213 is retracted to drive the third slider 212 to move away from the center of the second cavity 211, thereby realizing the mold opening action. Driven by the fourth cylinder 213, the third slider 212 realizes automatic mold opening and closing, saving time and effort.

[0048] A plurality of second lifting cylinders 221 are fixedly provided on the circumference of the second intermediate mold 22. The plurality of second lifting cylinders 221 are arranged vertically downward, and the movable ends of the second lifting cylinders 221 are fixedly connected to the second bottom mold 23. In this embodiment, the number of the second lifting cylinders 221 is four, and the four second lifting cylinders 221 are fixedly arranged on two opposite side walls of the second intermediate mold 22. The second lifting cylinders 221 extend and push the second intermediate mold 22, so that the second intermediate mold 22 slides in the vertical direction relative to the second bottom mold 23. Specifically, when the second lifting cylinders 221 are extended, the second intermediate mold 22 moves upward under the push of the second lifting cylinders 221, and the second intermediate mold 22 is separated from the second bottom mold 23 and has a certain distance. When the second lifting cylinders 221 are contracted, the second intermediate mold 22 moves downward under the drive of the second lifting cylinders 221 until it contacts the second bottom mold 23, thereby completing the mold closing of the second intermediate mold 22 and the second bottom mold 23.

[0049] like Fig. 9As shown, the second intermediate mold 22 is provided with a plurality of fourth sliders 222, and the plurality of fourth sliders 222 are all horizontally slidably connected with the second intermediate mold 22, and the plurality of fourth sliders 222 are all inclined wedge structures with the upper size larger than the lower size, and the fourth slider 222 has an inclined third inclined surface 2221, and the third inclined surface 2221 forms an acute angle with the vertical direction. In this embodiment, the number of the fourth sliders 222 is two, and the bottoms of the two fourth sliders 222 and the third inclined surfaces 2221 are fixed with guide rails 1222, and the guide rails 1222 arranged at the bottom slide in the guide grooves 120 arranged at the top of the second intermediate mold 22, and the guide rails 1222 and the guide grooves 120 are preferably dovetail groove structures, and may also be other cross-sectional shapes. The guide rails 1222 arranged at the bottom of the fourth slider 222 cooperate with the guide grooves 120 at the top of the second intermediate mold 22 and play a guiding role, ensuring that the fourth slider 222 slides horizontally on the second intermediate mold 22.

[0050] like Fig.10 As shown, a plurality of second fixed core blocks 231 are provided on the top of the second bottom mold 23, and a plurality of fourth sliders 222 are respectively connected to the corresponding second fixed core blocks 231 in a vertical sliding manner. In this embodiment, two fourth sliders 222 are respectively inserted between the second fixed core blocks 231, and the second fixed core block 231 is provided with a fourth inclined surface 2311, which is provided corresponding to the third inclined surface 2221. When the second bottom mold 23 and the second intermediate mold 22 are closed, the third inclined surface 2221 and the fourth inclined surface 2311 are in contact. A guide groove 120 is provided on the fourth inclined surface 2311, and the shape and size of the guide groove 120 are adapted to the guide rail 1222 provided on the third inclined surface 2221, so as to play a guiding and positioning role, and ensure that the positional relationship between each fourth slider 222 and each second fixed core block 231 is relatively fixed. When the second bottom mold 23 and the second middle mold 22 are in the mold-closing state, the fourth slider 222 and the second fixed core block 231 are tightly connected by the third inclined surface 2221 and the fourth inclined surface 2311 abutting against each other. When the second bottom mold 23 and the second middle mold 22 are demoulded, when the second middle mold 22 moves upward under the drive of the second lifting cylinder 221 and gradually separates from the second bottom mold 23, the distance between the third inclined surface 2221 of the fourth slider 222 and the fourth inclined surface 2311 of the second fixed core block 231 gradually increases as the demoulding continues, making it easier to separate the two and facilitating the subsequent demoulding action.

[0051] like Fig.10 and Fig.11As shown, the second bottom mold 23 is also provided with a third movable core block 232, a fourth movable core block 233 and a fifth movable core block 234, wherein the third movable core block 232 is a cylindrical structure, used for forming a circular hole in the lower shell 4. The fourth movable core block 233 is a long strip structure, used for forming a long strip hole in the lower shell 4. The fifth movable core block 234 is an irregular convex structure, used for forming an irregular groove in the lower shell 4. The third movable core block 232 and the fourth movable core block 233 are horizontally slidably connected to the second bottom mold 23 through the fifth cylinder 235 and the sixth cylinder 236, respectively, and the fifth movable core block 234 is slidably connected to the second bottom mold 23 along the inclined surface through the seventh cylinder 237. The fifth cylinder 235, the sixth cylinder 236 and the seventh cylinder 237 are all fixed on the second fixed core block 231, that is, the fixed ends of the fifth cylinder 235, the sixth cylinder 236 and the seventh cylinder 237 are all fixedly connected to the second fixed core block 231, and the movable ends of the fifth cylinder 235, the sixth cylinder 236 and the seventh cylinder 237 are respectively fixedly connected to the third movable core block 232, the fourth movable core block 233 and the fifth movable core block 234. The extension and contraction of the fifth cylinder 235, the sixth cylinder 236 and the seventh cylinder 237 respectively drive the third movable core block 232, the fourth movable core block 233 and the fifth movable core block 234 fixedly connected to their movable ends to move synchronously. Among them, the fifth cylinder 235 and the sixth cylinder 236 are arranged horizontally and respectively drive the third movable core block 232 and the fourth movable core block 233 to move back and forth in the horizontal direction, so as to realize the automatic mold opening and closing of the third movable core block 232, the fourth movable core block 233 and the second fixed core block 231. The seventh cylinder 237 is arranged obliquely and drives the fifth movable core block 234 to move back and forth in an oblique direction, so as to realize the automatic mold opening and closing between the fifth movable core block 234 and the second fixed core block 231. The third movable core block 232, the fourth movable core block 233 and the fifth movable core block 234 move back and forth under the drive of the fifth cylinder 235, the sixth cylinder 236 and the seventh cylinder 237, respectively, so as to realize the automatic mold opening and closing of the hole type and groove type molding mold, without the need to manually pick it out and demold it from the molded product, avoiding scratches, scratches or partial loss of the molded product, which not only saves time and labor, but also improves the surface quality of the molded product.

[0052] The lost foam mold of the gearbox housing of the utility model uses a first mold 1 for producing an upper housing 3 of the gearbox housing, and a second mold 2 for producing a lower housing 4 of the gearbox housing. The upper housing 3 and the lower housing 4 are bonded and fixed to form a complete gearbox housing. When the first mold 1 is closed, the first lifting cylinder 121 contracts, driving the first middle mold 12 to move downward until it contacts the first bottom mold 13, and tightly covers the first top mold 11 on the top of the first middle mold 12. Then the first cylinder 113 extends to drive the first slider 112 to move close to the center of the first cavity 111. The first slider 112 moves into place and closes the mold. The second cylinder 134 and the third cylinder 135 extend to respectively drive the first movable core block 132 and the second movable core block 133 to move into place and close the mold. When the first mold 1 needs to be opened, the first cylinder 113 contracts to drive the first slider 112 to move into place. The slider 112 moves away from the center of the first cavity 111, so that the first slider 112 is separated from the formed upper shell 3 and the demolding is completed. The second cylinder 134 and the third cylinder 135 contract and respectively drive the first movable core block 132 and the second movable core block 133 to move and separate from the formed upper shell 3 to complete the demolding. Then, the first top mold 11 is removed from the top of the first middle mold 12, and the first lifting cylinder 121 is started and extended to enable the first middle mold 12 to drive the upper shell 3 formed on its top to move upward synchronously, and then the upper shell 3 is removed from the first middle mold 12 to complete the demolding of the product. When the second mold 2 is closed, the second lifting cylinder 221 contracts, driving the second middle mold 22 to move downward to contact the second bottom mold 23, and the second top mold 21 is tightly covered on the top of the second middle mold 22. Then the fourth cylinder 213 is extended to drive the third slider 212 to move close to the center of the second cavity 211. The third slider 212 moves into place and closes the mold. The fifth cylinder 235 and the sixth cylinder 236 are extended to drive the third movable core block 232 and the fourth movable core block 233 to move into place respectively. At the same time, the seventh cylinder 237 contracts to drive the fifth movable core block 234 to move into place and complete the closing of the mold. When the second mold 2 needs to be opened, the fourth cylinder 213 contracts to drive the third slider 212 to move into place and close the mold. 212 moves away from the center of the second cavity 211, so that the third slider 212 is separated from the formed lower shell 4 and the demolding is completed, the fifth cylinder 235 and the sixth cylinder 236 contract to respectively drive the third movable core block 232 and the fourth movable core block 233 to move and separate from the formed lower shell 4, and at the same time the seventh cylinder 237 extends to drive the fifth movable core block 234 to separate from the formed lower shell 4 and complete the demolding, and then the second top mold 21 is removed from the top of the second middle mold 22, the second lifting cylinder 221 is started and extended to enable the second middle mold 22 to drive the lower shell 4 formed on its top to move upward synchronously, and then the lower shell 4 is removed from the second middle mold 22 to complete the demolding of the product.

[0053] Although the present invention discloses a preferred specific embodiment to achieve the above-mentioned purpose, it is not intended to limit the structural features of the present invention. Any person skilled in the art should know that under the technical spirit of the present invention, any easily conceivable changes or modifications are possible and are all covered by the scope of the patent application of the present invention.

Claims

1. A lost foam mold for a gearbox housing, characterized in that: The invention comprises a first mould (1) for producing an upper shell (3) and a second mould (2) for producing a lower shell (4), wherein the upper shell (3) and the lower shell (4) are combined to form a gearbox shell; the first mould (1) comprises a first top mould (11), a first middle mould (12) and a first bottom mould (13) which are arranged in sequence from top to bottom, a plurality of movable core blocks are arranged on the first bottom mould (13), and each of the movable core blocks is slidably connected to the first bottom mould (13) via a driving member; the second mould (2) comprises a second top mould (21), a second middle mould (22) and a second bottom mould (23) which are arranged in sequence from top to bottom, a plurality of movable core blocks are arranged on the second bottom mould (23), and each of the movable core blocks is slidably connected to the second bottom mould (23) via a driving member.

2. The lost foam mold for the gearbox housing according to claim 1, characterized in that: The first top mold (11) covers the top of the first middle mold (12), and a plurality of first lifting cylinders (121) are fixedly provided on the circumference of the first middle mold (12). The plurality of first lifting cylinders (121) are arranged vertically downward, and the movable ends of the first lifting cylinders (121) are fixedly connected to the first bottom mold (13).

3. The lost foam mold for a gearbox housing according to claim 1 or 2, characterized in that: The first top mold (11) has a first cavity (111) with a bottom opening, two first sliders (112) are slidably arranged in the first cavity (111), two first cylinders (113) are fixedly arranged on the outer side of the side wall of the first top mold (11), and the movable ends of the two first cylinders (113) are respectively fixedly connected to the corresponding first sliders (112).

4. The lost foam mold for a gearbox housing according to claim 1 or 2, characterized in that: A plurality of second sliding blocks (122) are provided on the first middle mold (12), the plurality of second sliding blocks (122) are all horizontally slidably connected to the first middle mold (12), and the plurality of second sliding blocks (122) are all inclined wedge structures with an upper dimension larger than a lower dimension.

5. The lost foam mold for the gearbox housing according to claim 4, characterized in that: A plurality of first fixed core blocks (131) are provided on the top of the first bottom mold (13); a plurality of second sliding blocks (122) are respectively connected to the corresponding first fixed core blocks (131) in a vertical sliding manner; a first movable core block (132) and a second movable core block (133) are also provided on the first bottom mold (13); the first movable core block (132) is connected to the first bottom mold (13) in a horizontal sliding manner via a second cylinder (134); and the second movable core block (133) is connected to the first bottom mold (13) in a sliding manner along an inclined surface via a third cylinder (135).

6. The lost foam mold for a gearbox housing according to claim 1, characterized in that: The second top mold (21) covers the top of the second middle mold (22), and a plurality of second lifting cylinders (221) are fixedly provided on the circumference of the second middle mold (22). The plurality of second lifting cylinders (221) are arranged vertically downward, and the movable ends of the second lifting cylinders (221) are fixedly connected to the second bottom mold (23).

7. The lost foam mold for a gearbox housing according to claim 1, characterized in that: The second top mold (21) has a second cavity (211) with a bottom opening, a third slider (212) is slidably arranged in the second cavity (211), a fourth cylinder (213) is fixedly arranged on the outer side of the side wall of the second top mold (21), and a movable end of the fourth cylinder (213) is fixedly connected to the third slider (212).

8. The lost foam mold for a gearbox housing according to claim 1, characterized in that: A plurality of fourth sliding blocks (222) are provided on the second middle mold (22), the plurality of fourth sliding blocks (222) are all horizontally slidably connected to the second middle mold (22), and the plurality of fourth sliding blocks (222) are all inclined wedge structures with an upper dimension larger than a lower dimension.

9. The lost foam mold for the gearbox housing according to claim 8, characterized in that: A plurality of second fixed core blocks (231) are provided on the top of the second bottom mold (23); a plurality of fourth sliding blocks (222) are respectively connected to the corresponding second fixed core blocks (231) in a vertical sliding manner; a third movable core block (232), a fourth movable core block (233) and a fifth movable core block (234) are also provided on the second bottom mold (23); the third movable core block (232) and the fourth movable core block (233) are respectively connected to the second bottom mold (23) in a horizontal sliding manner via a fifth cylinder (235) and a sixth cylinder (236); and the fifth movable core block (234) is connected to the second bottom mold (23) in a sliding manner along an inclined surface via a seventh cylinder (237).

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