Lightweight piston mold structure

Abstract

The present invention discloses a lightweight piston mold structure, and specifically relates to the technical field of piston molds. The present invention sets a flip mechanism, in which a transmission shaft drives a transmission rod 1 to rotate synchronously, and the transmission rod 1 is hinged with a transmission rod 2, and the transmission rod 2 is linked with the transmission shaft, and the transmission rod 2 is hinged with the mounting plate, so that the mounting plate can move, and the lower mold base follows the transmission, so that the lower mold base and the top surface of the base rotate and are in a flipping state, which is convenient for separating the molded product in the molding cavity; a feeding mechanism is set, and two mechanical clamps enter the molding cavity through corresponding avoidance grooves, and then put the wear-resistant ring into the wear-resistant ring placement groove in the molding cavity, thereby realizing the coexistence of the wear-resistant ring and the cooling oil channel, resisting thermal fatigue and mechanical fatigue of the piston, reducing the temperature of the piston top head, and resisting deformation of the piston body and wear and aging of sealing rings, oil seals and other mechanisms through the design of the wear-resistant ring, thereby extending the service life.

Description

Technical Field

[0001] The present invention relates to the technical field of piston moulds, in particular to a lightweight piston mould structure. Background Art

[0002] The gasoline engine piston includes structures such as the piston crown, piston skirt, ring area, pin hole, and pin seat, and the lightweighting of the piston mainly focuses on the structural optimization design of high-strength metal.

[0003] After searching, the invention patent with publication number CN111421114B discloses an improved structure of the mold assembly that greatly improves the casting accuracy of lightweight aluminum pistons. It has the advantages of avoiding various abnormal wear and tear of the pin hole mold, greatly enhancing the anti-bumping performance, and improving the accuracy of the radial casting thickness of the slider mold in production. However, after the product is formed, there are problems such as difficulty in removing the product from the mold cavity and difficulty in manual removal; and the piston body is easy to deform, and the volume of the piston for gasoline engines is relatively small. The installation production method using the diesel engine piston mold in the existing technology is difficult to achieve the technical requirements of the simultaneous existence of wear-resistant rings and cooling oil channels. Summary of the Invention

[0004] The purpose of the present invention is to provide a lightweight piston mold structure. By setting a flipping mechanism, the transmission shaft drives the transmission rod 1 to rotate synchronously, and the transmission rod 1 is hinged to the transmission rod 2, and the transmission rod 2 moves together with the transmission shaft. The transmission rod 2 is hinged to the mounting plate, which can make the mounting plate move. The lower mold base on the top of the mounting plate follows the transmission, so that the lower mold base and the top surface of the base rotate, so that the lower mold base is in a flipping state, which is convenient for removing the molded product in the molding cavity to solve the problems mentioned in the above background technology.

[0005] The present invention can be implemented through the following technical solution: a lightweight piston mold structure, including a lower mold base and an upper mold base, the lower mold base is used in conjunction with the upper mold base, the bottom end of the lower mold base is provided with a base, one side of the bottom end of the lower mold base is rotatably connected to the top surface of the base, the top surface of the base is provided with a receiving cavity, and a feeding mechanism is provided on one side of the base, and a flipping mechanism for flipping the lower mold base is installed inside the receiving cavity;

[0006] The flip mechanism includes a transmission shaft installed in the middle of the accommodating cavity, and the outer surface of the transmission shaft is fixedly sleeved with two transmission rods 1, one end of each transmission rod 1 is rotatably hinged to a transmission rod 2, and one end of the transmission rod 2 is hinged to a mounting plate, and the top surface of the mounting plate is fixed to the bottom surface of the lower mold base;

[0007] The turning mechanism further comprises a stepping motor arranged on the outside of the base, wherein the output end of the stepping motor is fixed to the end of the transmission shaft.

[0008] A further technical improvement of the present invention is that a supporting protrusion for supporting the movable ends of the first transmission rod and the second transmission rod is provided inside the accommodating cavity.

[0009] A further technical improvement of the present invention is that: the top surface of the lower mold base is provided with a molding cavity, the interior of the molding cavity is provided with a wear-resistant ring placement groove, and the inner wall of the molding cavity is provided with a plurality of avoidance grooves, and the bottom surface of the inner cavity of the wear-resistant ring placement groove is provided with a plurality of protrusions, and the avoidance groove extends downward along the inner wall of the molding cavity and is connected with the wear-resistant ring placement groove.

[0010] A further technical improvement of the present invention is that four guide columns are installed on the top surface of the base near the four edges, the outer surfaces of the four guide columns are slidably connected to the lifting plate, and the top surfaces of the four guide columns are fixedly connected to the supporting plate, and the top surface of the supporting plate is installed with a hydraulic cylinder, the pushing end of the hydraulic cylinder is fixed to the top surface of the lifting plate, and the bottom surface of the lifting plate is fixed to the top surface of the upper mold base.

[0011] A further technical improvement of the present invention is that the feeding mechanism includes two support plates arranged in parallel, the top ends of the two support plates are fixedly connected to a sleeve, a material moving platform is arranged below the sleeve, a pushing cylinder is installed on the side wall of the sleeve, and the inner cavity of the sleeve is slidably connected to a transmission plate, the surface of the transmission plate is fixed to the end of the piston rod of the pushing cylinder, and the moving distance of the transmission plate reaches between the upper mold base and the lower mold base.

[0012] A further technical improvement of the present invention is that an electric push rod is installed on the bottom surface of the transmission plate, the telescopic end of the electric push rod is fixedly connected to a connecting plate, two vertical plates are fixedly installed on the bottom surface of the connecting plate, and a mechanical clamp is installed on the inner wall of each vertical plate, and a wear-resistant ring is clamped on the mechanical clamp.

[0013] A further technical improvement of the present invention is that: the front side surface of the base is connected to a discharge guide seat, and a plurality of rubber guide rollers for discharge are installed inside the discharge guide seat.

[0014] A further technical improvement of the present invention is that: the surface of the discharge guide seat is provided with a mounting recess used in conjunction with the base, and the inner wall width of the discharge guide seat is the same as the length of the lower mold seat, the outer surface of the base is fixedly connected with a mounting ear near the mounting recess, the mounting ear is fixed to the base by bolts, the top surface of the mounting recess is installed with a positioning column, and the top surface of the base is provided with a positioning hole used in conjunction with the positioning column.

[0015] The present invention also provides a method for producing a lightweight piston mold structure, which specifically includes the following steps:

[0016] Step 1: Install the discharge guide seat on the front surface of the base so that the discharge guide seat is aligned with the lower mold seat;

[0017] Step 2: Two mechanical grippers pick up the wear-resistant ring from the transfer table. Under the push of the push cylinder, the transmission plate slides in the sleeve and drives the connecting plate to the upper position of the lower die seat. Then, the two mechanical grippers place the wear-resistant ring into the wear-resistant ring placement groove in the forming die cavity through the avoidance groove;

[0018] Step 3: After the piston product is formed, the drive shaft is driven to rotate by the stepper motor, and the drive shaft drives the drive rod 1 and the drive rod 2 to move. The lower die base is flipped through the fixed connection between the mounting plate and the lower die base, and the molded product is separated from the molding cavity. The molded product contacts the surface of multiple rubber guide rollers.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. In the present invention, a flip mechanism is provided, in which the transmission shaft drives the transmission rod 1 to rotate synchronously, and the transmission rod 1 is hinged to the transmission rod 2. The transmission rod 2 moves in conjunction with the transmission shaft, and the transmission rod 2 is hinged to the mounting plate, so that the mounting plate can move. The lower die base on the top of the mounting plate follows the transmission, causing the lower die base and the top surface of the base to rotate, so that the lower die base is in a flipped state, which facilitates the separation of the molded product in the molding cavity.

[0021] 2. In the present invention, a feeding mechanism is provided, and two mechanical grippers enter the molding cavity through corresponding avoidance grooves, and then the wear-resistant ring is placed in the wear-resistant ring placement groove in the molding cavity, thereby realizing automatic placement of the wear-resistant ring. The piston has a cooling oil channel and a wear-resistant ring design, which realizes the coexistence of the wear-resistant ring and the cooling oil channel, can well resist thermal fatigue and mechanical fatigue, can reduce the temperature of the piston top surface, and through the design of the wear-resistant ring, resists piston body deformation and wear and aging of sealing rings, oil seals and other mechanisms, thereby extending the service life;

[0022] 3. In the present invention, a discharge guide seat is provided, the discharge guide seat is placed on the front side of the base, and the positioning column on the top of the mounting recess is aligned with the positioning hole on the base and plugged in. Then, the mounting ear is fitted with the surface of the base, and the bolts are embedded into the inside of the mounting ear and the base to realize the installation of the discharge guide seat. After the lower mold seat is flipped over, it enters the discharge guide seat, and the molded product falls onto multiple rubber guide rollers, reducing damage to the surface of the molded product. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] To facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0024] Figure 1 Schematic diagram of the external structure of the present invention;

[0025] Figure 2This is a schematic diagram of the three-dimensional structural connection of the lower mold base of the present invention;

[0026] Figure 3 Schematic diagram of the installation structure of the mechanical gripper of the present invention;

[0027] Figure 4 This is a schematic diagram of the three-dimensional installation structure of the lower mold base and the base of the present invention;

[0028] Figure 5 For the present invention Figure 1 A partial enlarged view of point A in the middle.

[0029] In the figure: 1. Base; 2. Accommodating cavity; 3. Lower die seat; 4. Guide column; 5. Lifting plate; 6. Upper die seat; 7. Transmission plate; 8. Support plate; 9. Sleeve; 10. Discharge guide seat; 11. Rubber guide roller; 12. Wear-resistant ring placement groove; 13. Avoidance groove; 14. Protrusion; 15. Electric push rod; 16. Connecting plate; 17. Vertical plate; 18. Mechanical clamp; 19. Wear-resistant ring; 20. Transmission shaft; 21. Transmission rod 1; 22. Transmission rod 2; 23. Support protrusion; 24. Mounting plate; 25. Stepper motor; 26. Positioning column; 27. Positioning hole; 28. Mounting recess; 29. Mounting ear. DETAILED DESCRIPTION

[0030] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0031] See also Figure 1-Figure 5 As shown, the present invention provides a lightweight piston mold structure, including a lower mold base 3 and an upper mold base 6, the lower mold base 3 is used in conjunction with the upper mold base 6, the bottom end of the lower mold base 3 is provided with a base 1, and one side of the bottom end of the lower mold base 3 is rotatably connected to the top surface of the base 1, the top surface of the base 1 is provided with a accommodating cavity 2, and one side of the base 1 is provided with a feeding mechanism, and the interior of the accommodating cavity 2 is provided with a flipping mechanism for flipping the lower mold base 3 for rotation; the flipping mechanism includes a transmission shaft 20 installed in the middle of the inner cavity of the accommodating cavity 2, and two transmission rods 21 are fixedly sleeved on the outer surface of the transmission shaft 20, and one end of each transmission rod 21 is rotatably hinged with a transmission rod 2 22, and one end of the transmission rod 2 22 is hinged with a mounting plate 24, and the top surface of the mounting plate 24 is fixed to the bottom surface of the lower mold base 3; the flipping mechanism also includes a stepper motor 25 arranged on the outside of the base 1, and the output end of the stepper motor 25 is fixed to the end of the transmission shaft 20.

[0032] A support protrusion 23 is provided inside the accommodating chamber 2 for supporting the movable ends of the transmission rod 1 21 and the transmission rod 2 22. When the transmission rod 1 21 and the transmission rod 2 22 are in a folded state, the support protrusion 23 supports the connecting end of the transmission rod 1 21 and the transmission rod 2 22.

[0033] After the piston product is formed, the output shaft of the stepper motor 25 drives the transmission shaft 20 to rotate, and the transmission shaft 20 drives the transmission rod 1 21 to rotate synchronously, and the transmission rod 1 21 is hinged to the transmission rod 2 22, and the transmission rod 2 22 moves together with the transmission shaft 20, and the transmission rod 2 22 is hinged to the mounting plate 24, so that the mounting plate 24 can move, and the lower mold base 3 on the top of the mounting plate 24 follows the transmission, so that the lower mold base 3 and the top surface of the base 1 rotate, so that the lower mold base 3 is in a flipped state. Since a stepper motor 25 of model Ezi-Step BT is used, the rotation of the stepper motor 25 runs step by step at a fixed angle, and the distance adjustment is relatively precise. When the lower mold base 3 is flipped to a vertical state, it is convenient to separate the molded product in the molding cavity and to take out the molded product.

[0034] The top surface of the lower mold base 3 is provided with a molding cavity, the interior of the molding cavity is provided with a wear-resistant ring placement groove 12, and the inner wall of the molding cavity is provided with a plurality of avoidance grooves 13, and the bottom surface of the inner cavity of the wear-resistant ring placement groove 12 is provided with a plurality of protrusions 14, the protrusions 14 are used to support the wear-resistant ring 19, and the avoidance grooves 13 extend downward along the inner wall of the molding cavity and are connected with the wear-resistant ring placement groove 12.

[0035] Four guide columns 4 are installed on the top surface of the base 1 near the four edges. The outer surfaces of the four guide columns 4 are slidably connected to the lifting plate 5, and the top surfaces of the four guide columns 4 are fixedly connected to the supporting plate. The top surface of the supporting plate is installed with a hydraulic cylinder. The pushing end of the hydraulic cylinder is fixed to the top surface of the lifting plate 5, and the bottom surface of the lifting plate 5 is fixed to the top surface of the upper mold base 6.

[0036] The feeding mechanism includes two support plates 8 arranged in parallel, the top ends of the two support plates 8 are fixedly connected to a sleeve 9, a material moving platform is arranged below the sleeve 9, a pushing cylinder is installed on the side wall of the sleeve 9, and the inner cavity of the sleeve 9 is slidably connected to a transmission plate 7, the surface of the transmission plate 7 is fixed to the end of the piston rod of the pushing cylinder, and the moving distance of the transmission plate 7 reaches between the upper mold base 6 and the lower mold base 3.

[0037] An electric push rod 15 is installed on the bottom surface of the transmission plate 7, and the telescopic end of the electric push rod 15 is fixedly connected to a connecting plate 16. Two vertical plates 17 are fixedly installed on the bottom surface of the connecting plate 16. A mechanical clamp 18 is installed on the inner wall of each vertical plate 17, and the mechanical clamp 18 clamps a wear-resistant ring 19.

[0038] The vertical inclination angle of the avoidance groove 13 is 91 degrees.

[0039] A wear-resistant ring placement groove 12 and several avoidance grooves 13 for placing the wear-resistant ring 19 are provided in the forming cavity of the lower die base 3. The avoidance groove 13 extends downward along the inner wall of the forming cavity until it is connected to the wear-resistant ring placement groove 12. During the feeding work, the upper die base 6 and the lifting plate 5 are first in a closed state, that is, the upper die base 6 is located directly above the lower die base 3, and a wear-resistant ring 19 is placed on the material transfer table. The wear-resistant ring 19 is clamped from the material transfer table by two mechanical clamps 18. Under the push of the pushing cylinder, the transmission plate 7 slides in the sleeve 9 and drives the connecting plate 16 to the upper position of the lower die base 3. At this time, the avoidance groove 13 and the mechanical clamp 18 are in a vertical line. Then, under the push of the electric push rod 15, the two mechanical clamps 18 enter the molding cavity through the corresponding avoidance groove 13, and then put the wear-resistant ring 19 into the wear-resistant ring placement groove 12 in the molding cavity, so as to realize the automatic placement of the wear-resistant ring 19 and reduce manual operation. After the piston product is formed, the piston has a cooling oil channel and a wear-resistant ring 19 design, which realizes the coexistence of the wear-resistant ring 19 and the cooling oil channel, can well resist its thermal fatigue and mechanical fatigue, can reduce the temperature of the piston top head, and at the same time, the design of the wear-resistant ring 19 can resist the deformation of the piston body and the wear and aging of the sealing ring, oil seal and other mechanisms, thereby extending the service life.

[0040] After the wear-resistant ring 19 is installed, the transmission plate 7 enters the sleeve 9 under the drive of the pushing cylinder, and the lifting plate 5 is pushed by the hydraulic cylinder, and the lifting plate 5 drives the upper die base 6 and the lower die base 3 to be pressed together.

[0041] A discharge guide seat 10 is connected to the front surface of the base 1 , and a plurality of rubber guide rollers 11 for discharge are installed inside the discharge guide seat 10 .

[0042] The surface of the discharge guide seat 10 is provided with a mounting recess 28 for use with the base 1, and the inner wall width of the discharge guide seat 10 is the same as the length of the lower mold seat 3. The outer surface of the base 1 is fixedly connected to a mounting ear 29 near the mounting recess 28. The mounting ear 29 is fixed to the base 1 by bolts. A positioning column 26 is installed on the top surface of the mounting recess 28, and the top surface of the base 1 is provided with a positioning hole 27 for use with the positioning column 26.

[0043] Before use, place the discharge guide seat 10 on the front side of the base 1, and align the positioning column 26 on the top of the mounting recess 28 with the positioning hole 27 on the base 1, then the mounting ear 29 fits with the surface of the base 1, and the bolts are embedded into the mounting ear 29 and the inside of the base 1 to realize the installation of the discharge guide seat 10. After the lower mold base 3 is flipped over, it enters the discharge guide seat 10, and the molded product falls onto multiple rubber guide rollers 11, and is transported to the next processing step through the rubber guide rollers 11. The design of the rubber guide rollers 11 reduces damage to the surface of the molded product.

[0044] A protrusion 14 is provided in the molding cavity of the lower mold base 3 to support the wear-resistant ring 19 , and an avoidance groove 13 is provided to enable the mechanical clamp 18 to place the wear-resistant ring 19 into the mold cavity.

[0045] The present invention also provides a method for producing a lightweight piston mold structure, which specifically includes the following steps:

[0046] Step 1: Install the discharge guide seat 10 on the front surface of the base 1 so that the discharge guide seat 10 is aligned with the lower mold base 3;

[0047] Step 2: Two mechanical grippers 18 pick up the wear-resistant ring 19 from the material transfer platform. Under the push of the push cylinder, the transmission plate 7 slides in the sleeve 9 and drives the connecting plate 16 to the upper position of the lower die base 3. Then, the two mechanical grippers 18 place the wear-resistant ring 19 into the wear-resistant ring placement groove 12 in the forming cavity through the avoidance groove 13;

[0048] Step 3: After the piston product is formed, the drive shaft 20 is driven to rotate by the stepper motor 25, and the drive shaft 20 drives the drive rod 1 21 and the drive rod 2 22 to move. Through the fixed connection between the mounting plate 24 and the lower die base 3, the lower die base 3 is flipped, and the molded product is separated from the molding cavity. The molded product contacts the surface of multiple rubber guide rollers 11.

[0049] When the present invention is in use, the discharge guide seat 10 is placed on the front side of the base 1, and the positioning column 26 on the top of the mounting recess 28 is aligned and plugged into the positioning hole 27 on the base 1. Then, the mounting ear 29 is fitted with the surface of the base 1, and the bolts are embedded in the mounting ear 29 and the inside of the base 1, thereby completing the installation of the discharge guide seat 10. After the lower mold base 3 is flipped over, it enters the discharge guide seat 10, and the molded product falls onto the multiple rubber guide rollers 11, reducing damage to the surface of the molded product.

[0050] The two mechanical grippers 18 enter the molding cavity through the corresponding avoidance grooves 13, and then place the wear-resistant ring 19 into the wear-resistant ring placement groove 12 in the molding cavity, thereby realizing the automatic placement of the wear-resistant ring 19. The piston has a cooling oil channel and a wear-resistant ring 19, which realizes the coexistence of the wear-resistant ring 19 and the cooling oil channel, and can well resist its thermal fatigue and mechanical fatigue, and can reduce the temperature of the piston top surface. Through the design of the wear-resistant ring 19, the piston body deformation and the wear and aging of the sealing ring, oil seal and other mechanisms are resisted, thereby extending the service life;

[0051] The transmission shaft 20 drives the transmission rod 1 21 to rotate synchronously, and the transmission rod 1 21 is hinged to the transmission rod 2 22, and the transmission rod 2 22 moves together with the transmission shaft 20, and the transmission rod 2 22 is hinged to the mounting plate 24, so that the mounting plate 24 can move, and the lower mold base 3 on the top of the mounting plate 24 follows the transmission, so that the lower mold base 3 and the top surface of the base 1 rotate, so that the lower mold base 3 is in a flipped state, which is convenient for separating the molded product in the molding cavity.

[0052] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A lightweight piston mold structure, comprising a lower mold base (3) and an upper mold base (6), wherein the lower mold base (3) and the upper mold base (6) are used in conjunction with each other, and a base (1) is provided at the bottom end of the lower mold base (3), characterized in that: One side of the bottom end of the lower die base (3) is rotatably connected to the top surface of the base (1); a receiving cavity (2) is provided on the top surface of the base (1); a feeding mechanism is provided on one side of the base (1); a turning mechanism for turning the lower die base (3) is installed inside the receiving cavity (2); The flip mechanism includes a transmission shaft (20) installed in the middle of the inner cavity of the accommodating cavity (2), the outer surface of the transmission shaft (20) is fixedly sleeved with two transmission rods (21), one end of each transmission rod (21) is rotatably hinged to a transmission rod (22), one end of the transmission rod (22) is hinged to a mounting plate (24), and the top surface of the mounting plate (24) is fixed to the bottom surface of the lower mold base (3); The turning mechanism further comprises a stepping motor (25) arranged on the outside of the base (1), wherein the output end of the stepping motor (25) is fixed to the end of the transmission shaft (20); The top surface of the lower die base (3) is provided with a forming cavity, the interior of the forming cavity is provided with a wear-resistant ring placement groove (12), and the inner wall of the forming cavity is provided with a plurality of avoidance grooves (13), the inner cavity bottom surface of the wear-resistant ring placement groove (12) is provided with a plurality of protrusions (14), and the avoidance grooves (13) extend downward along the inner wall of the forming cavity and are connected to the wear-resistant ring placement groove (12); The feeding mechanism comprises two support plates (8) arranged in parallel, the top ends of the two support plates (8) are fixedly connected to a sleeve (9), a material moving platform is arranged below the sleeve (9), a pushing cylinder is installed on the side wall of the sleeve (9), and a transmission plate (7) is slidably connected to the inner cavity of the sleeve (9), and the surface of the transmission plate (7) is fixed to the end of the piston rod of the pushing cylinder; An electric push rod (15) is installed on the bottom surface of the transmission plate (7), and the telescopic end of the electric push rod (15) is fixedly connected to a connecting plate (16). Two vertical plates (17) are fixedly installed on the bottom surface of the connecting plate (16). A mechanical clamp (18) is installed on the inner wall of each vertical plate (17), and a wear-resistant ring (19) is clamped on the mechanical clamp (18).

2. The lightweight piston mold structure according to claim 1, characterized in that: The interior of the accommodating cavity (2) is provided with a supporting protrusion (23) for supporting the movable ends of the first transmission rod (21) and the second transmission rod (22).

3. The lightweight piston mold structure according to claim 1, characterized in that: Four guide columns (4) are installed on the top surface of the base (1) near the edges of the four sides, and the outer surfaces of the four guide columns (4) are slidably connected to the lifting plate (5), and the top surfaces of the four guide columns (4) are fixedly connected to the supporting plate, and the top surface of the supporting plate is installed with a hydraulic cylinder, the pushing end of the hydraulic cylinder is fixed to the top surface of the lifting plate (5), and the bottom surface of the lifting plate (5) is fixed to the top surface of the upper mold base (6).

4. The lightweight piston mold structure according to claim 1, characterized in that: A discharge guide seat (10) is connected to the front surface of the base (1), and a plurality of rubber guide rollers (11) for discharge are installed inside the discharge guide seat (10).

5. The lightweight piston mold structure according to claim 4, characterized in that: The surface of the discharge guide seat (10) is provided with a mounting recess (28) for use with the base (1), and the inner wall width of the discharge guide seat (10) is the same as the length of the lower mold seat (3). The outer surface of the base (1) is fixedly connected with a mounting ear (29) near the mounting recess (28), and the mounting ear (29) is fixed to the base (1) by bolts. A positioning column (26) is installed on the top surface of the mounting recess (28), and a positioning hole (27) for use with the positioning column (26) is provided on the top surface of the base (1).

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