Positioning mechanism for the injection mold of the engine flip cover

Abstract

The present invention belongs to the field of mold positioning mechanisms, and specifically discloses a positioning mechanism for an engine flip cover injection mold. A first positioning slider is slidably connected to the lower mold, and a second positioning slider is slidably connected within an opening. A vertical first rack is fixedly connected to the second positioning slider. A transmission gear is meshed with the first rack, and a second rack is meshed with the transmission gear. The bottom of the second rack is fixedly connected to a horizontal telescopic member, and one end of the horizontal telescopic member is fixedly connected to the piston rod of an upward pushing cylinder. A second wedge block is provided on the second rack, and a first wedge block is located directly below the second wedge block. The first guide block has a first guide hole, and the second rack is slidably connected within the first guide hole. A second guide block is slidably connected to the first rack, and the second guide block is fixedly connected to the second positioning slider. The first guide block is connected to the second guide block. This device solves the problem in the prior art that the protruding part of the positioning block cannot be removed from the recessed part of the inclined snap.

Description

Technical Field

[0001] The present invention belongs to the field of die positioning mechanisms, and particularly relates to a positioning mechanism for an injection mold of an engine flip cover. Background Art

[0002] An injection mold is a tool for producing plastic products; it is also a tool for giving plastic products a complete structure and precise dimensions. Injection molding is a processing method used in mass production of some complex-shaped parts. Specifically, it means injecting the heat-melted plastic into the mold cavity at high pressure by an injection molding machine, and after cooling and solidifying, obtaining the formed product. Injection molds are classified into two types according to the molding characteristics: thermosetting plastic molds and thermoplastic plastic molds; they are classified into transfer molds, blow molds, casting molds, thermoforming molds, hot pressing molds (compression molds), injection molds, etc. according to the molding process. Among them, the hot pressing mold can be further divided into three types: overflow type, semi-overflow type, and non-overflow type according to the overflow method, and the injection mold can be divided into two types: cold runner mold and hot runner mold according to the gating system; it can be divided into two types: mobile type and fixed type according to the loading and unloading method.

[0003] The buckle of this engine flip cover is different from the ordinary flat buckle. The buckle of this product is inclined upward and is an inclined buckle, which is used for long-term fixation on the engine. Under the influence of engine vibration, the detachment rate relative to the flat buckle is greatly reduced. However, in the prior art, the mold of the engine flip cover usually combines a positioning block with the mold to form a cavity of the flat buckle. After molding, the positioning block is translated away to expose the buckle, preventing the flat buckle from hanging upside down on the mold when the lower ejector rod ejects the engine flip cover. However, the hook of this product is inclined upward. When the positioning block is translated away, the protrusion of the positioning block located in the concave part of the inclined buckle cannot be taken out by translation. Summary of the Invention

[0004] The purpose of the present invention is to provide a positioning mechanism for an injection mold of an engine flip cover to solve the problem that the protruding part of the positioning block in the prior art cannot be removed from the concave part of the inclined buckle.

[0005] To achieve the above object, the basic solution of the present invention provides a positioning mechanism for an engine flip cover injection mold, including an upward push cylinder, a lower mold and a positioning mechanism. The positioning mechanism includes a first positioning slider for forming the two side planes of the inclined buckle. The first positioning slider is slidably connected to the lower mold. There is an opening in the first positioning slider, and a second positioning slider is slidably connected in the opening. One side of the second positioning slider located in the opening is fixedly connected with a vertical first rack. A transmission gear is engaged with the first rack, and a second rack is engaged with the transmission gear. The bottom of the second rack is fixedly connected with a horizontal telescopic member. One end of the horizontal telescopic member away from the bottom of the second rack is fixedly connected to the piston rod of the upward push cylinder. A first wedge block with a wedging surface at the top is provided on the lower mold, and a second wedge block capable of wedging with the wedging surface of the first wedge block is provided on the second rack. The first wedge block is directly below the second wedge block. A first guiding block is fixedly connected to the first positioning slider. The first guiding block has a first guiding hole, and the second rack is slidably connected in the first guiding hole. A second guiding block is slidably connected to the first rack, and the second guiding block is fixedly connected to the second positioning slider. The first guiding block is connected to the second guiding block.

[0006] The principle of this basic solution is as follows: Make the piston rod of the upward push cylinder move downward. When the piston rod of the upward push cylinder moves downward, it drives the second rack to move downward through the horizontal telescopic member. When the second rack moves downward, it drives the transmission gear to rotate counterclockwise, and the transmission gear drives the first rack to move upward. The first rack drives the second positioning slider to move upward, so that the protrusion at the lower part of the second positioning slider is separated from the concave part of the inclined buckle.

[0007] When the second rack continues to move downward, the second wedge block wedges with the first wedge block, forcing the second rack to move away from the first rack. When the second rack moves, it drives the first guiding block to move, and the first guiding block drives the first positioning slider and the second guiding block to move, so that the first positioning slider and the second positioning slider move away from the inclined buckle, that is, the first positioning slider and the second positioning slider are separated from the inclined buckle at the same time.

[0008] The beneficial effects of this basic solution are as follows: 1. After the mold is opened, this device first moves up the part that restricts the translation of the positioning block, and then makes the positioning block translate. It solves the problem that the protruding part of the positioning block cannot be removed from the concave part of the inclined buckle.

[0009] 2. This device uses a gear-rack structure and a horizontal telescopic member to achieve the translation of the positioning block in a narrow space, keeping the volume of the mold within a relatively small range.

[0010] 3. The actions of this device are coherent, continuously realizing the upward movement and translation of the second positioning slider, improving the work efficiency.

[0011] Optimization Solution 1: The horizontal telescopic member is a telescopic cylinder. The second rack is fixedly connected to the cylinder body of the telescopic cylinder. The piston rod of the telescopic cylinder is fixedly connected to the piston rod of the upward pushing cylinder. A suction cup is fixedly connected to the first guide block. The first guide block is connected to the second guide block through the suction cup. An air pipe is fixedly connected to the first guide block. One end of the air pipe is communicated with the suction cup, and the other end of the air pipe is communicated with the rodless cavity of the telescopic cylinder. The settings of the suction cup and the telescopic cylinder facilitate the separation of the second positioning slider from the first positioning slider, and thus the two sliders can be quickly replaced, improving the maintenance efficiency.

[0012] Optimization Solution 2: A friction pad is installed between the first rack and the second guide block. The setting of the friction pad prevents the first rack from falling due to its own weight.

[0013] Optimization Solution 3: The transmission gear is rotatably connected to the first positioning slider. This enables the transmission gear to move together with the first positioning slider.

[0014] Optimization Solution 4: A return spring is fixedly connected to the piston of the telescopic cylinder. The end of the return spring away from the piston is fixed on the inner wall of the telescopic cylinder. The setting of the return spring facilitates the first positioning slider and the second positioning slider to return to their original positions and prepare for the next mold closing. Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of the positioning mechanism for the injection mold of the engine flip cover in the embodiment of the present invention;

[0016] Figure 2 It is Figure 1 the enlarged view at A in

[0017] Figure 3 It is Figure 2 the enlarged view at B in

[0018] Figure 4 It is Figure 2 the sectional view in the C-C direction in

[0019] Figure 5 It is Figure 4 the enlarged view at D in Detailed Description of the Invention

[0020] The following further details the present invention through specific embodiments:

[0021] The reference numerals in the drawings of the specification include: lower mold 1, first positioning slider 2, second positioning slider 3, transmission gear 4, engine flip cover 5, air pipe 6, first rack 7, second rack 8, second wedge block 9, first wedge block 10, telescopic cylinder 11, upward pushing cylinder 12, connecting rod 13, sliding rod 14, suction cup 15, first guide block 16, second guide block 17.

[0022] Embodiment: The positioning mechanism for the injection mold of the engine flip cover in this solution, as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 shown, includes an upward pushing cylinder 12, a lower mold 1 and a positioning mechanism. The lower mold 1 has a cavity for forming the engine flip cover 5. The positioning mechanism includes a first positioning slider 2 for forming the two side planes of the inclined buckle. The first positioning slider 2 is slidably connected inside the side wall of the cavity of the lower mold 1, and the first positioning slider 2 has a forming plane for forming the two side planes of the inclined buckle. An opening is provided inside the first positioning slider 2, and a second positioning slider 3 is slidably connected inside the opening. A protrusion for forming the inclined buckle is provided below the second positioning slider 3.

[0023] One side of the second positioning slider 3 located inside the opening is fixedly connected with a vertical first rack 7. A transmission gear 4 is engaged with the first rack 7. The transmission gear 4 is rotatably connected to the first positioning slider 2. A vertical second rack 8 is engaged with the transmission gear 4. The bottom of the second rack 8 is fixedly connected with a horizontal telescopic member. The horizontal telescopic member is a telescopic cylinder 11. The telescopic cylinder 11 includes a telescopic cylinder body, a telescopic piston and a telescopic piston rod. The bottom of the second rack 8 is fixedly connected to the telescopic cylinder body, and the telescopic piston rod is fixedly connected to the piston rod of the upward pushing cylinder 12. The rodless cavity of the upward pushing cylinder 12 is communicated with a two-way air pump, and the upward pushing cylinder 12 is fixed on the lower mold 1

[0024] A first wedge block 10 with a wedging surface at the top is provided on the lower mold 1. A second wedge block 9 capable of wedging with the wedging surface of the first wedge block 10 is provided on the second rack 8. The bottom of the second wedge block 9 is a wedging surface for wedging with the first wedge block 10. The first wedge block 10 is located directly below the second wedge block 9.

[0025] A first guide block 16 is fixedly connected to the first positioning slider 2. The first guide block 16 has a first guide hole, and the second rack 8 is slidably connected in the first guide hole. A slide bar 14 is fixedly connected to the first rack 7. A second guide block 17 is slidably connected to the slide bar 14. A friction pad is installed between the slide bar 14 and the second guide block 17 to prevent the first rack 7 from falling due to its own weight. The second guide block 17 is fixedly connected to the second positioning slider 3. A connecting rod 13 is fixedly connected to the first guide block 16. One end of the connecting rod 13 away from the first guide block 16 is connected with a suction cup 15. The first guide block 16 is connected to the second guide block 17 through the suction cup 15.

[0026] A trachea 6 is fixedly connected to the first guiding block 16. One end of the trachea 6 communicates with the suction cup 15, and the other end of the trachea 6 communicates with the rodless cavity of the telescopic cylinder 11. The trachea 6 is a flexible tube. There is a moving distance between the left inner wall of the first guiding hole and the left side wall of the second positioning slider 3, and the width of the moving distance is 2 mm, and the tooth length of the transmission gear 4 is 7 mm. A return spring is fixedly connected to the piston of the telescopic cylinder 11, and the end of the return spring away from the piston is fixed on the inner wall of the cylinder.

[0027] Initially, the piston rod of the upward pushing cylinder 12 extends. When the engine flip cover 5 is formed, the upper die is moved away. The gas in the rodless cavity of the upward pushing cylinder 12 is extracted by the two-way air pump, so that the piston rod of the upward pushing cylinder 12 moves downward. When the piston rod of the upward pushing cylinder 12 moves downward, it drives the second rack 8 to move downward through the horizontal telescopic member. When the second rack 8 moves downward, it drives the transmission gear 4 to rotate counterclockwise, and the transmission gear 4 drives the first rack 7 to move upward. The first rack 7 drives the second positioning slider 3 to move upward, so that the protrusion at the lower part of the second positioning slider 3 is separated from the recess of the inclined buckle.

[0028] When the second rack 8 continues to move downward, the second wedge block engages with the first wedge block, forcing the second rack 8 to move to the left. When the second rack 8 moves, it drives the cylinder block of the telescopic cylinder 11 to move to the left, while the piston rod of the telescopic cylinder 11 remains stationary. Therefore, a negative pressure is generated in the rodless cavity of the telescopic cylinder 11. Through the trachea 6, the negative pressure generated in the rodless cavity of the telescopic cylinder 11 causes the suction cup 15 to tightly adsorb the second guiding block 17, so that the first guiding block 16 and the second guiding block 17 are fixed. At this time, because there is a moving distance between the left inner wall of the first guiding hole and the left side wall of the second positioning slider 3, the second rack 8 will not drive the first guiding block 16 to move when it moves, leaving time for the suction cup 15 to adsorb the second guiding block 17. The second rack 8 continues to move to the left. When the second rack 8 contacts the inner wall of the first guiding hole, the second rack 8 drives the first guiding block 16 to move when it moves, and the first guiding block 16 drives the first positioning slider 2 and the second guide to move, so that the first positioning slider 2 and the second positioning slider 3 move away from the inclined buckle, that is, the first positioning slider 2 and the second positioning slider 3 are separated from the inclined buckle at the same time.

[0029] The above are only the embodiments of the present invention, and well-known common knowledge is not described in detail herein. It should be noted that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicability of the patent. The protection scope required by this application should be based on the content of its claims, and the specific implementation manners described in the specification can be used to explain the content of the claims.

Claims

1. Positioning mechanism for the injection mold of the engine flip cover, characterized in that: It includes a pushing cylinder, a lower die and a positioning mechanism. The positioning mechanism includes a first positioning slider for forming the two side planes of the inclined snap. The first positioning slider is slidably connected to the lower die. There is an opening inside the first positioning slider, and a second positioning slider is slidably connected inside the opening. There is a protrusion for forming the inclined snap below the second positioning slider. One side of the second positioning slider located inside the opening is fixedly connected with a vertical first rack. A transmission gear is engaged with the first rack. A second rack is engaged with the transmission gear. The bottom of the second rack is fixedly connected with a horizontal telescopic member. One end of the horizontal telescopic member away from the bottom of the second rack is fixedly connected to the piston rod of the pushing cylinder. The rodless cavity of the pushing cylinder is communicated with a two-way air pump. The pushing cylinder is fixed on the lower die. There is a first wedge block with a wedging surface at the top on the lower die. There is a second wedge block on the second rack that can wedge with the wedging surface of the first wedge block. The first wedge block is directly below the second wedge block. A first guiding block is fixedly connected to the first positioning slider. The first guiding block has a first guiding hole. The second rack is slidably connected in the first guiding hole. A second guiding block is slidably connected to the first rack. The second guiding block is fixedly connected to the second positioning slider. The first guiding block is connected to the second guiding block; the horizontal telescopic member is a telescopic cylinder. The second rack is fixedly connected to the cylinder body of the telescopic cylinder. The piston rod of the telescopic cylinder is fixedly connected to the piston rod of the pushing cylinder. A suction cup is fixedly connected to the first guiding block. The first guiding block is connected to the second guiding block through the suction cup. An air pipe is fixedly connected to the first guiding block. One end of the air pipe is communicated with the suction cup, and the other end of the air pipe is communicated with the rodless cavity of the telescopic cylinder.

2. The positioning mechanism for the injection mold of the engine flip cover according to claim 1, characterized in that: A friction pad is installed between the first rack and the second guiding block.

3. The positioning mechanism for the engine flip-up injection mold according to claim 2, characterized in that: The transmission gear is rotatably connected to the first positioning slider.

4. The positioning mechanism for the engine flip cover injection mold according to claim 3, characterized in that: A return spring is fixedly connected to the piston of the telescopic cylinder. One end of the return spring away from the piston is fixed on the inner wall of the telescopic cylinder.

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