Die for in-die pressure-maintaining extrusion thinning cutting and multi-laminated thrust-increasing oil cylinder

Abstract

The utility model discloses an in-mold pressure-maintaining extrusion-thinning cutting mold and a multi-laminated thrust-increasing oil cylinder, the in-mold pressure-maintaining extrusion-thinning cutting mold comprises a mold main body, the mold main body comprises a plate A and a plate B, a mold cavity is arranged between the plate A and the plate B, and the mold cavity is a cavity for injection molding or extrusion molding of a product; the die body further comprises a pressure maintaining assembly, an in-die cutting assembly and an extrusion thinning assembly, and the pressure maintaining assembly, the in-die cutting assembly and the extrusion thinning assembly each comprise at least one multi-lamination thrust increasing oil cylinder. According to the utility model, the pressure maintaining assembly and the multi-laminated thrust-increasing oil cylinder matched with the pressure maintaining assembly are arranged, the pressure maintaining assembly is arranged at a position which is far away from the feeding hole of the die cavity or is easy to shrink due to thick material level, and the multi-laminated thrust-increasing oil cylinder can be used for effectively maintaining pressure in the die so as to ensure the forming quality of a product, so that the whole formed product is fuller, and the production efficiency is improved. The appearance is smoother and more attractive.

Description

Technical Field

[0001] The utility model relates to the field of mold oil cylinders, in particular to a mold for pressure-maintaining, squeezing, thinning and cutting in a mold and a multi-layered thrust-increasing oil cylinder. Background Art

[0002] Traditional molds, such as plastic molds and alloy molds, have the following problems during use: When the mold only feeds in one direction, if the other end of the mold is far away from the feeding end, the pressure will cause relatively less material to be fed, resulting in shrinkage or sand holes in the thick parts of the molded product, which cannot meet the requirements of high-quality products. Some products themselves have a structure of varying thicknesses, and the thin parts are prone to dissipation, which will affect the molding effect of the thin parts of the product.

[0003] Many products need to be cut off excess material after molding. The early cutting method was to take the product out and then cut it manually. This method had the problem of low cutting accuracy, resulting in high post-processing intensity and low production efficiency. Later, someone improved it by setting a cutter and a hydraulic cylinder inside the mold. The hydraulic cylinder drives the cutter to cut excess material from the product or make holes in the molded product. Although this can effectively improve the cutting accuracy and production efficiency, some products have thicker material or higher material hardness, especially metal materials, and the thrust of ordinary cylinders cannot meet the requirements. At this time, it is necessary to increase the thrust of the cylinder, but the increase in the pressure of the cylinder will inevitably increase the volume of the cylinder, such as width and length. In this way, in some specific molds, such as when the assembly space inside the mold is limited, it is necessary to redesign and develop the structure of the mold to adapt to the installation of the enlarged cylinder, which is very troublesome. Utility Model Content

[0004] The purpose of the utility model is to provide a die for in-mold pressure-maintaining, squeezing and cutting and a multi-layer thrust-increasing cylinder to improve the problems raised in the above-mentioned background technology:

[0005] Technical solution:

[0006] The first aspect of the utility model provides a die for in-mold pressure-maintaining extrusion thinning and cutting, including a die main body, characterized in that: the die main body includes:

[0007] A plate and a B plate, wherein a mold cavity is provided between the A plate and the B plate, and the mold cavity is used for injection molding or extrusion molding of the product;

[0008] The mold body also includes a pressure-maintaining component, an in-die cutting component, and an extrusion thinning component, and the pressure-maintaining component, the in-die cutting component, and the extrusion thinning component all include at least one multi-layer thrust-increasing oil cylinder;

[0009] The pressure-maintaining component is used to maintain the pressure of the product in the mold cavity;

[0010] The in-mold cutting component is used to cut the sprues or holes of the product in the mold cavity;

[0011] The extrusion thinning component is used for extrusion thinning of the product in the mold cavity.

[0012] Furthermore, the pressure-maintaining assembly also includes a pressure-maintaining push block and a groove for accommodating materials, the pressure-maintaining push block passes through the groove and extends into the groove, one end of the pressure-maintaining push block is fixedly connected to the output end of the corresponding multi-layer thrust-increasing cylinder, the pressure-maintaining push block is located above the multi-layer thrust-increasing cylinder, and when the pressure-maintaining push block is flush with the groove opening, the pressure-maintaining assembly is in a pressure-maintaining state.

[0013] Furthermore, the in-mold cutting assembly also includes a cutter, which is located in the mold cavity. The cutter is fixedly connected to the output end of the corresponding multi-layer thrust-increasing cylinder. The cutter is located above the multi-layer thrust-increasing cylinder. When the cutter is flush with the bottom surface of the mold cavity, it is the initial state of the in-mold cutting assembly. When the cutter extends into the mold cavity, it is the cutting state of the in-mold cutting assembly.

[0014] Furthermore, the thinning assembly also includes an thinning push block, which is located in the mold cavity and fixedly connected to the output end of the corresponding multi-layer thrust-increasing cylinder. The thinning push block is located above the multi-layer thrust-increasing cylinder. When the thinning push block is flush with or lower than the bottom surface of the mold cavity, it is the initial state of the thinning assembly. When the thinning push block extends into the mold cavity, it is the extrusion state of the thinning assembly.

[0015] Furthermore, the pressure-maintaining push block and the groove are perpendicular to the mold cavity, and the pressure-maintaining push block and the groove are located at the bottom of the mold cavity, and the pressure-maintaining push block includes a reset base arranged at the lower end of the pressure-maintaining push block, and a first reset spring is arranged on the reset base, and the first reset spring is used to assist the multi-layer thrust-increasing cylinder to reset the pressure-maintaining push block;

[0016] The cutter and the ejector pin are both perpendicular to the mold cavity, and the cutter and the ejector pin are located at the bottom of the mold cavity. The cutter includes a reset base arranged at the lower end of the cutter, and a second reset spring is arranged on the reset base. The second reset spring is used to assist the multi-layer thrust-increasing cylinder to reset the cutter.

[0017] The thinning push block is perpendicular to the mold cavity, and the thinning push block and the rod groove are located at the bottom of the mold cavity. The thinning push block includes a reset base arranged at the lower end of the thinning push block, and a third reset spring is arranged on the reset base. The third reset spring is used to assist the multi-layer thrust-increasing cylinder to reset the thinning push block.

[0018] Furthermore, the mold body also includes a base plate, in which oil inlet and outlet channels are arranged, and each oil inlet and outlet channel is respectively provided with an oil inlet and outlet connection port on the side wall of the base plate, and each oil inlet and outlet connection port is connected to the hydraulic device; the oil inlet and outlet ports of multiple groups of the multi-layer thrust-increasing cylinders are respectively connected to the corresponding oil inlet and outlet channels.

[0019] Another aspect of the improvement of the utility model is a multi-layer thrust-increasing oil cylinder, including a connecting rod piston and a cylinder body. The multi-layer thrust-increasing oil cylinder includes at least one bottom cylinder, several groups of middle cylinders and a top cylinder from bottom to top. Each cylinder body has an oil cavity. The oil cavities are slidably connected with connecting rod pistons in a one-to-one manner. The connecting rod pistons abut against each other. The connecting rod pistons in the top cylinder extend to the outside of the top cylinder. The connecting rod piston is an overall T-shaped structure. A sealing ring is provided at the position where the connecting rod piston contacts the inner wall of the oil cavity.

[0020] Furthermore, the bottom cylinder, the middle cylinder and the top cylinder are vertically provided with an inlet and outlet oil passage 1 and an inlet and outlet oil passage 2, and the inlet and outlet oil passage 1 and the inlet and outlet oil passage 2 on each cylinder body are correspondingly connected, and the connecting rod piston includes a sealing ring arranged at a position in contact with the inner wall of the oil cavity.

[0021] Furthermore, the inlet and outlet oil passage 1 is connected with the oil chambers in the bottom cylinder, the middle cylinder and the top cylinder in a one-to-one correspondence, and the inlet and outlet oil holes corresponding to the oil chambers are all arranged near the bottom of the oil chambers. When the multi-layer thrust increasing cylinder is in a jacking state, the hydraulic oil in the external hydraulic device enters the oil chambers of each cylinder through the inlet and outlet oil passage 1, and the connecting rod pistons in each cylinder are pushed upward at the same time by the hydraulic oil until the connecting rod pistons are completely pushed out, so that the multi-layer thrust increasing cylinder has multiple driving force.

[0022] Furthermore, the second inlet and outlet oil channel is connected with the oil cavity in the top cylinder, and the inlet and outlet oil holes connected with the oil cavity in the top cylinder are arranged near the top of the oil cavity. When the multi-layer thrust-increasing cylinder completes the lifting action, the hydraulic oil of the external hydraulic device enters the top cylinder from the second inlet and outlet oil channel and is located in the oil cavity above the connecting rod piston of the top cylinder, pushing the connecting rod piston in the top cylinder to slide downward, and the connecting rod piston is in the retracted state. In the lifting state, the hydraulic oil entering each oil cylinder returns to the hydraulic press through the first inlet and outlet oil channel.

[0023] Beneficial effects:

[0024] 1. The utility model provides a pressure-maintaining component and a matching multi-layer thrust-increasing oil cylinder. The pressure-maintaining component is arranged at a position far from the mold cavity feed port or where the material level is thick and easy to shrink. The multi-layer thrust-increasing oil cylinder can be used to effectively maintain pressure in the mold to ensure the molding quality of the product, so that the molded product is fuller as a whole and has a smoother and more beautiful appearance.

[0025] 2. The utility model can effectively cut waste materials in the mold by arranging the in-mold cutting component and the matching multi-layer thrust-increasing oil cylinder, and the cut edge of the cut product is smoother and flatter. In addition, the multi-layer thrust-increasing oil cylinder can be used to cut thicker plastic products or metal products;

[0026] 3. The utility model is provided with a thinning component and a matching multi-layer thrust-increasing oil cylinder. The multi-layer thrust-increasing oil cylinder can be used to extrude the product in the mold with a certain force to ensure the quality of product molding, so that products with thin material levels can also have a better molding effect;

[0027] 4. The multi-layer thrust-increasing cylinder of the utility model is composed of two or more cylinder bodies. Without increasing the overall width and length of the cylinder, the cylinder can achieve twice or more times the thrust. The more stacked cylinders are, the greater the thrust. It is convenient to adapt to more usage scenarios and meet more mold usage requirements. It is very practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a cross-sectional view of the mold body in the utility model;

[0029] Figure 2 It is a three-dimensional diagram of the mold body in the utility model;

[0030] Figure 3 This is a schematic diagram of the structure of the pressure-maintaining component in the utility model;

[0031] Figure 4 It is a structural schematic diagram of the extrusion thinning component in the utility model;

[0032] Figure 5 This is a schematic diagram of the structure of the die-cutting component of the utility model;

[0033] Figure 6 A three-dimensional diagram of the multi-layered thrust-increasing oil cylinder in the utility model;

[0034] Figure 7 A cross-sectional view of a multi-layered thrust-increasing oil cylinder in the utility model;

[0035] Figure 8 It is a three-dimensional diagram of the multi-layer thrust-increasing oil cylinder in the utility model;

[0036] Fig. 9 It is a structural schematic diagram of the top cylinder in the utility model;

[0037] Fig.10 It is a structural schematic diagram of the top cylinder and the connecting rod piston in the utility model. DETAILED DESCRIPTION

[0038] The utility model is described in detail below in conjunction with the accompanying drawings.

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] The following is a further description with reference to the accompanying drawings and specific embodiments:

[0043] In some embodiments, as shown in the attached Figure 1-10As shown, a mold for in-mold pressure-maintaining extrusion and thinning cutting comprises a mold body 1, and the mold body 1 comprises: an A plate 101 and a B plate 102, a mold cavity is arranged between the A plate 101 and the B plate 102, and the mold cavity is a groove body with a certain depth and shape, and the mold cavity is a cavity for injection molding or extrusion molding of the product; the mold body 1 also comprises a pressure-maintaining component, an in-mold cutting component and an extrusion and thinning component. In this embodiment, the pressure-maintaining component is arranged on one side of the extrusion and thinning component, and the in-mold cutting component is arranged on one side of the extrusion and thinning component. The pressure-maintaining component, the in-mold cutting component and the extrusion and thinning component are arranged in a straight line, and the pressure-maintaining component, the in-mold cutting component and the extrusion and thinning component all comprise at least one multi-layer thrust-increasing oil cylinder 8; the pressure-maintaining component is used for maintaining the pressure of the product in the mold cavity; the in-mold cutting component is used for cutting the sprue or hole of the product in the mold cavity; the extrusion and thinning component is used for extrusion and thinning the product in the mold cavity;

[0044] Thus, the mold body 1 further includes a feed port 11 , which is provided on the A plate 101 , and the feed port 11 is communicated with the mold cavity so that the raw material can enter the mold cavity.

[0045] In some embodiments, as shown in the attached Figure 3 As shown, the pressure-maintaining assembly also includes a pressure-maintaining push block 4 and a groove 3 for accommodating materials. The groove 3 is opened at the bottom of the mold cavity and is located on the B plate 102. The pressure-maintaining push block 4 passes through the groove 3 and extends into the groove 3. One end of the pressure-maintaining push block 4 is fixedly connected to the output end of the corresponding multi-layer thrust-increasing oil cylinder 8. During the repeated extension and contraction of the multi-layer thrust-increasing oil cylinder 8, the pressure-maintaining push block 4 slides up and down in the groove 3. The pressure-maintaining push block 4 is located above the multi-layer thrust-increasing oil cylinder 8. When the pressure-maintaining push block 4 is flush with the opening of the groove 3, it is in the pressure-maintaining state of the pressure-maintaining assembly.

[0046] In this way, when the multi-layer thrust-increasing cylinder 8 is in the initial state, the pressure-maintaining push block 4 is located at the bottom of the groove 3. After the raw material enters the mold cavity, a part of the excess raw material enters the groove 3. When the product in the mold cavity is preformed, the multi-layer thrust-increasing cylinder 8 starts to lift up and squeeze the raw material inside the groove 3 into the preformed product, making the molded product fuller. Therefore, even when the product material level is thick or there are sand holes, pressure-maintaining molding will not occur without shrinkage or sand, thus achieving the purpose of pressure maintenance. In addition, the multi-layer thrust-increasing cylinder 8 with large thrust is used to achieve a better pressure-maintaining effect.

[0047] In some embodiments, as shown in the attached Figure 5As shown, the extrusion thinning component also includes an extrusion thinning push block 9, which is located in the mold cavity. In this embodiment, the extrusion thinning push block 9 extends through the B plate 102 into the mold cavity. The extrusion thinning push block 9 is slidably connected to the B plate 102. The extrusion thinning push block 9 can be a circular structure or a rectangular structure, or a structure of any shape, or a pattern, text, etc. of any shape. The extrusion thinning push block 9 is fixedly connected to the output end of the corresponding multi-layer thrust-increasing oil cylinder 8. The extrusion thinning push block 9 is located above the multi-layer thrust-increasing oil cylinder 8. When the extrusion thinning push block 9 is flush with or lower than the bottom surface of the mold cavity, it is the initial state of the extrusion thinning component. State, when the extrusion push block 9 extends into the mold cavity, it is the extrusion state of the extrusion component. When the extrusion push block 9 is lower than the bottom surface of the mold cavity, a groove body of a certain depth will be formed at the bottom of the mold cavity. When the raw material injection is completed, the raw material will enter the groove body, and the multi-layer thrust-increasing oil cylinder 8 will be started to push the extrusion push block 9 upward to the set product thickness position. The extrusion push block 9 can be set to a structure of any shape according to the product structure, so that the position in the mold cavity where it is difficult to pass the glue can be filled with enough material for extrusion, so that when the product material level is thin, it can also be pressed and formed without lack of glue and dissatisfaction;

[0048] In this way, when a certain part of the molded product needs to be thinned, the thinning push block 9, under the push of the multi-layer thrust-increasing cylinder 8, performs thinning operation on the product and performs extremely thin processing in the mold cavity. The appearance of the molded product is smoother and more beautiful. The thinning effect is better by using the multi-layer thrust-increasing cylinder 8 with large thrust.

[0049] In some embodiments, as shown in the attached Figure 4 As shown, the in-mold cutting assembly also includes a cutter 6, which is located in the mold cavity. The cutter 6 is fixedly connected to the output end of the corresponding multi-layer thrust-increasing oil cylinder 8, and the cutter 6 is located above the multi-layer thrust-increasing oil cylinder 8. When the cutter 6 is flush with the bottom surface of the mold cavity, it is the initial state of the in-mold cutting assembly, and when the cutter 6 extends into the mold cavity, it is the cutting state of the in-mold cutting assembly.

[0050] In this embodiment, the cutter 6 extends through the B plate 102 into the mold cavity, and the cutter 6 is slidably connected to the B plate 102. When the product in the mold cavity is formed, the excess waste will be cut off by the cutter 6, and the cutter 6 can be set to a structure of any shape according to the product structure, so that positions that are difficult to trim manually can also be cut, so that products with different excess material levels can be cut and formed without uneven cutting;

[0051] In this way, when a hole needs to be reserved in a product, the cutter 6 can be set to a cutter with the required hole shape, so as to facilitate the rapid hole cutting operation on the product.

[0052] In some embodiments, as shown in the attached Figure 1-5As shown, the pressure-maintaining push block 4 and the groove 3 are both perpendicular to the mold cavity, and the pressure-maintaining push block 4 and the groove 3 are located at the bottom of the mold cavity, the pressure-maintaining push block 4 includes a reset base arranged at the lower end of the pressure-maintaining push block 4, and a first reset spring 13 is arranged on the reset base, and the first reset spring 13 is arranged between the reset base and the B plate 102, one end of the first reset spring 13 is in contact with the reset base, and the other end of the first reset spring 13 is in contact with the bottom of the corresponding B plate 102, so that an elastic support state is formed between the pressure-maintaining push block 4 and the B plate 102, and the first reset spring 13 is used to assist the multi-layer thrust-increasing cylinder 8 in resetting the pressure-maintaining push block 4; the cutter 6 and the ejector 7 are both perpendicular to the mold cavity, and the cutter 6 and the ejector 7 are located at the bottom of the mold cavity, the cutter 6 includes a reset base arranged at the lower end of the cutter 6, and a second reset spring 14 is arranged on the reset base, and the second reset spring 14 is arranged between the reset base and the B plate 102, one end of the second reset spring 14 is in contact with the reset base, and the other end of the second reset spring 14 It contacts the bottom of the corresponding B plate 102, so that an elastic support state is formed between the cutter 6 and the B plate 102, and the second return spring 14 is used to assist the multi-layer thrust-increasing cylinder 8 to reset the cutter 6; the thinning push block 9 and the rod groove are both perpendicular to the mold cavity, and the thinning push block 9 is located at the bottom of the mold cavity. The thinning push block 9 includes a reset base arranged at the lower end of the thinning push block 9, and a third return spring 15 is arranged on the reset base. The third return spring 15 is arranged between the reset base and the B plate 102, one end of the third return spring 15 contacts the reset base, and the other end of the second return spring 14 contacts the bottom of the corresponding B plate 102, so that an elastic support state is formed between the thinning push block 9 and the B plate 102, and the third return spring 15 is used to assist the multi-layer thrust-increasing cylinder 8 to reset the thinning push block 9. In this embodiment, the first return spring 13, the second return spring 14 and the third return spring 15 are each provided with two groups, and the corresponding two groups of springs are relatively arranged to increase the balance of the elastic support.

[0053] Further, as attached Figure 3-4 As shown, the mold body 1 also includes a base plate 10, which is located below the multi-layer thrust-increasing cylinders 8. Each multi-layer thrust-increasing cylinder 8 is threadedly fixedly connected to the base plate 10, and an oil inlet and outlet channel 1001 is provided in the base plate 10. Each oil inlet and outlet channel 1001 is respectively provided with an oil inlet and outlet connection port on the side wall of the base plate 10, and each oil inlet and outlet connection port is connected to a hydraulic device; multiple groups of the oil inlet and outlet ports of the multi-layer thrust-increasing cylinders 8 are respectively connected to the corresponding oil inlet and outlet channels 1001.

[0054] In some embodiments, as shown in the attached Figure 6-10As shown, the multi-layered thrust-increasing oil cylinder comprises a connecting rod piston and a cylinder body. The multi-layered thrust-increasing oil cylinder 8 comprises at least one bottom cylinder 81, a plurality of middle cylinders 82 and a top cylinder 83 from bottom to top. A threaded hole penetrating the cylinder body is provided on each cylinder body. The cylinder bodies are fixed together by a threaded rod of a certain length. The top cylinder 32 comprises a bottom cover 831, which is fixed to the bottom of the top cylinder 32 by threads. The connecting rod piston 84 in the middle cylinder 82 extends into the top cylinder 32 through the bottom cover 831. Each cylinder body has an oil cavity, and the connecting rod piston 84 is slidably connected to the oil cavity one by one. The plugs 84 are in contact with each other, the connecting rod piston 84 in the top cylinder 83 extends to the outside of the top cylinder 83, and an oil seal or a sealing ring is arranged at the position where the top of the connecting rod piston 84 in the top cylinder 83 contacts the top cylinder 83. The connecting rod piston 84 is a T-shaped structure as a whole, and the connecting rod piston 84 includes a sealing ring 87 arranged at the position where it contacts the inner wall of the oil cavity. In this embodiment, the middle cylinder 82 is provided with two groups, the bottom cylinder 81 is a bottom sealing setting, and the bottom cylinder 81 and the middle cylinder 82, the middle cylinder 82 and the middle cylinder 82, and the middle cylinder 82 and the top cylinder 83 are all provided with oil seals to increase their air tightness and prevent oil leakage;

[0055] In this way, the connecting rod piston 84 in the bottom cylinder 81 passes through the middle cylinder 82 and extends into the middle cylinder 82, the top of the connecting rod piston 84 in the bottom cylinder 81 contacts the bottom of the connecting rod piston 84 in the middle cylinder 82, the connecting rod piston 84 in the middle cylinder 82 passes through the adjacent middle cylinder 82 or top cylinder 83, the top of the connecting rod piston 84 in the middle cylinder 82 contacts the bottom of the connecting rod piston 84 in the adjacent middle cylinder 82 or top cylinder 83, forming a series state, and a sealing ring and / or oil seal is provided between each connecting rod piston 84 and the adjacent cylinder body to ensure the sealing effect between the two adjacent cylinder bodies.

[0056] In some embodiments, as shown in the attached Figure 6-10As shown, the bottom cylinder 81, the middle cylinder 82 and the top cylinder 83 are vertically provided with an inlet and outlet oil passage 1 85 and an inlet and outlet oil passage 2 86. The inlet and outlet oil passage 1 85 and the inlet and outlet oil passage 2 86 on each cylinder body are correspondingly connected. A sealing rubber ring is provided at the position where each inlet and outlet oil passage of the bottom cylinder 81, the middle cylinder 82 and the top cylinder 83 is connected. In this embodiment, the inlet and outlet oil passage 1 85 and the inlet and outlet oil passage 2 86 on the bottom cylinder 81 and the middle cylinder 82 all penetrate the bottom cylinder 81 and the middle cylinder 82. The oil inlet and outlet passages 85 are connected to the oil chambers in the bottom cylinder 81, the middle cylinder 82 and the top cylinder 83 in a one-to-one correspondence, and the oil inlet and outlet holes corresponding to the oil chambers are arranged near the bottom of the oil chambers. When the multi-layer thrust-increasing oil cylinder 8 is in the jacking state, the hydraulic oil in the external hydraulic device enters the oil chambers of each oil cylinder through the oil inlet and outlet passages 85. Under the push of the hydraulic oil, the connecting rod pistons 84 in each oil cylinder are pushed upward at the same time until the connecting rod pistons 8 4 is fully ejected, so that the multi-layer thrust-increasing oil cylinder 8 has multiple times the driving force, the second inlet and outlet oil passage 86 is connected with the oil cavity in the top cylinder 83, and the inlet and outlet oil holes of the second inlet and outlet oil passage 86 and the oil cavity in the top cylinder 83 are arranged near the top of the oil cavity, and the connecting rod piston 84 in the top cylinder 83 divides the oil cavity in the top cylinder 83 into two mutually closed spaces, the first inlet and outlet oil passage 85 is located in the space below the connecting rod piston 84, and the second inlet and outlet oil passage 86 is located in the space below the connecting rod piston 84, when the multi-layer thrust-increasing oil cylinder 8 completes the lifting action, the hydraulic oil of the external hydraulic device enters the space above the oil cavity in the top cylinder 83 from the inlet and outlet oil passage 2 86, pushing the connecting rod piston 84 in the top cylinder 83 to slide downward. This state is the retracted state of the multi-layer thrust-increasing oil cylinder 8. In this state, the hydraulic oil in each oil cylinder and the hydraulic oil in the oil cavity of the top cylinder 83 located in the space below the connecting rod piston 84 return to the hydraulic press through the inlet and outlet oil passage 1 85;

[0057] In this way, when the multi-layer thrust-increasing cylinder 8 is in the lifting action, the hydraulic oil enters into each oil cylinder through the inlet and outlet oil passage 1 85, including the oil cavity of the top cylinder 83 and the space below the connecting rod piston 84. When each connecting rod piston 84 slides upward for lifting, the hydraulic oil in the space above the connecting rod piston 84 in the oil cavity of the top cylinder 83 is discharged outward from the inlet and outlet oil passage 2 86, and this process is repeated. The on-off and pressurization states of the inlet and outlet oil passage 1 85 and the inlet and outlet oil passage 2 86 are all controlled by the solenoid valve and the control panel, which belongs to the prior art and will not be described in detail here.

[0058] Finally, the pressure-maintaining component, the in-die cutting component and the extrusion thinning component of the utility model are all provided with a reset spring. After the work of each component is completed, with the assistance of the reset spring, they can be better reset to prepare for the next work.

[0059] The above preferred implementations of the utility model are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with this technology to understand the content of the utility model and implement it accordingly, and cannot be used to limit the protection scope of the utility model. Any equivalent transformation or modification made according to the spirit of the utility model, any modification, equivalent replacement, and improvement made should be included in the protection scope of the utility model.

Claims

1. A die for in-mold pressure-maintaining extrusion thinning and cutting, comprising a die body (1), characterized in that: The mold body (1) comprises: A plate (101) and a plate (102), wherein a mold cavity is provided between the plate (101) and the plate (102), and the mold cavity is used for injection molding or extrusion molding of a product; The mold body (1) further comprises a pressure-maintaining component, an in-mold cutting component and an extrusion thinning component, wherein the pressure-maintaining component, the in-mold cutting component and the extrusion thinning component all comprise at least one multi-layer thrust-increasing oil cylinder (8); The pressure-maintaining component is used to maintain the pressure of the product in the mold cavity; The in-mold cutting component is used to cut the sprues or holes of the product in the mold cavity; The extrusion thinning component is used for extrusion thinning of the product in the mold cavity.

2. The die for in-mold pressure-maintaining extrusion thinning and cutting according to claim 1, characterized in that: The pressure-maintaining component also includes a pressure-maintaining push block (4) and a groove (3) for accommodating materials. The pressure-maintaining push block (4) passes through the groove (3) and extends into the groove (3). One end of the pressure-maintaining push block (4) is fixedly connected to the output end of the corresponding multi-layer thrust-increasing oil cylinder (8). The pressure-maintaining push block (4) is located above the multi-layer thrust-increasing oil cylinder (8). When the pressure-maintaining push block (4) is flush with the opening of the groove (3), the pressure-maintaining component is in a pressure-maintaining state.

3. The die for in-mold pressure-maintaining extrusion thinning and cutting according to claim 1, characterized in that: The in-mold cutting assembly further comprises a cutter (6), the cutter (6) being located in the mold cavity, the cutter (6) being fixedly connected to the output end of the corresponding multi-layer thrust-increasing oil cylinder (8), the cutter (6) being located above the multi-layer thrust-increasing oil cylinder (8), and when the cutter (6) is flush with the bottom surface of the mold cavity, it is the initial state of the in-mold cutting assembly, and when the cutter (6) extends into the mold cavity, it is the cutting state of the in-mold cutting assembly; The cutter (6) and the ejector pin (7) are both perpendicular to the mold cavity, and the cutter (6) and the ejector pin (7) are located at the bottom of the mold cavity. The cutter (6) includes a reset base arranged at the lower end of the cutter (6), and a second reset spring (14) is arranged on the reset base. The second reset spring (14) is used to assist the multi-layer thrust-increasing cylinder (8) to reset the cutter (6).

4. The die for in-mold pressure-maintaining extrusion thinning and cutting according to claim 1, characterized in that: The extrusion thinning component also includes an extrusion thinning push block (9), the extrusion thinning push block (9) is located in the mold cavity, the extrusion thinning push block (9) is fixedly connected to the output end of the corresponding multi-layer thrust-increasing oil cylinder (8), the extrusion thinning push block (9) is located above the multi-layer thrust-increasing oil cylinder (8), when the extrusion thinning push block (9) is flush with or lower than the bottom surface of the mold cavity, it is the initial state of the extrusion thinning component, when the extrusion thinning push block (9) extends into the mold cavity, it is the extrusion state of the extrusion thinning component; The thinning push block (9) is perpendicular to the mold cavity, and the thinning push block (9) and the rod groove are located at the bottom of the mold cavity. The thinning push block (9) includes a reset base arranged at the lower end of the thinning push block (9), and a third reset spring (15) is arranged on the reset base. The third reset spring (15) is used to assist the multi-layer thrust-increasing cylinder (8) to reset the thinning push block (9).

5. The die for in-mold pressure-maintaining extrusion thinning and cutting according to claim 2, characterized in that: The pressure-maintaining push block (4) and the groove (3) are both perpendicular to the mold cavity, and the pressure-maintaining push block (4) and the groove (3) are located at the bottom of the mold cavity. The pressure-maintaining push block (4) includes a reset base arranged at the lower end of the pressure-maintaining push block (4), and a first reset spring (13) is arranged on the reset base. The first reset spring (13) is used to assist the multi-layer thrust-increasing cylinder (8) to reset the pressure-maintaining push block (4).

6. The die for in-mold pressure-maintaining extrusion thinning and cutting according to claim 1, characterized in that: The mold body (1) also includes a bottom plate (10), in which oil inlet and outlet channels (1001) are arranged, and each oil inlet and outlet channel (1001) is respectively provided with an oil inlet and outlet connection port on the side wall of the bottom plate (10), and each oil inlet and outlet connection port is connected to a hydraulic device; and the oil inlet and outlet ports of multiple groups of the multi-layered thrust-increasing cylinders (8) are respectively connected to the corresponding oil inlet and outlet channels (1001).

7. A multi-layer thrust-increasing oil cylinder, comprising a connecting rod piston and a cylinder body, characterized in that: The multi-layer thrust-increasing oil cylinder (8) comprises from bottom to top at least one bottom cylinder (81), a plurality of middle cylinders (82) and a top cylinder (83), each cylinder body having an oil cavity, the oil cavities having connecting rod pistons (84) slidably connected one by one, the connecting rod pistons (84) abutting against each other, the connecting rod pistons (84) in the top cylinder (83) extending to the outside of the top cylinder (83), the connecting rod pistons (84) being a T-shaped structure as a whole, and the connecting rod pistons (84) comprising a sealing ring (87) arranged at a position in contact with the inner wall of the oil cavity.

8. The multi-layer thrust-increasing cylinder according to claim 7, characterized in that: The bottom cylinder (81), the middle cylinder (82) and the top cylinder (83) are vertically provided with an oil inlet and outlet passage 1 (85) and an oil inlet and outlet passage 2 (86). The oil inlet and outlet passage 1 (85) and the oil inlet and outlet passage 2 (86) on each cylinder body are correspondingly connected. Sealing rubber rings are provided at the positions where the oil inlet and outlet passages of the bottom cylinder (81), the middle cylinder (82) and the top cylinder (83) are connected.

9. The multi-layer thrust-increasing cylinder according to claim 8, characterized in that: The inlet and outlet oil passage (85) is connected to the oil chambers in the bottom cylinder (81), the middle cylinder (82) and the top cylinder (83) in a one-to-one correspondence. The inlet and outlet oil holes corresponding to the oil chambers in the inlet and outlet oil passage (85) are arranged near the bottom of the oil chambers. When the multi-layer thrust-increasing oil cylinder (8) is in a lifting state, the hydraulic oil in the external hydraulic device enters the oil chambers of each oil cylinder through the inlet and outlet oil passage (85). Under the continuous pressure of the hydraulic oil, the connecting rod pistons (84) in each oil cylinder are pushed upward at the same time until the connecting rod pistons (84) are completely pushed out, so that the multi-layer thrust-increasing oil cylinder (8) has multiple driving forces.

10. The multi-layer thrust-increasing cylinder according to claim 8, characterized in that: The second inlet and outlet oil passage (86) is connected to the oil cavity in the top cylinder (83), and the inlet and outlet oil holes connecting the second inlet and outlet oil passage (86) and the oil cavity in the top cylinder (83) are arranged near the top of the oil cavity. When the multi-layer thrust-increasing oil cylinder (8) completes the lifting action, the hydraulic oil of the external hydraulic device enters the top cylinder (83) from the second inlet and outlet oil passage (86) and is located in the oil cavity above the connecting rod piston (84) of the top cylinder (83), pushing the connecting rod piston (84) in the top cylinder (83) to slide downward. When the connecting rod piston (84) is in the retracted state, the hydraulic oil entering each oil cylinder in the lifting state flows back into the hydraulic press through the first inlet and outlet oil passage (85).

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