Automatic die-casting device for metal powder core

Abstract

The invention discloses an automatic die-casting device for metal powder cores, which relates to the field of powder forming and pressing and comprises a conveying part for conveying a lower die from front to back. A lower die feeding piece used for sequentially placing lower dies at the feeding end of the conveying piece and a discharging tank used for placing metal powder into the lower dies are installed on the conveying piece from front to back. The compacting piece is used for pre-compacting the metal powder in the lower die filled with the metal powder; the upper die feeding piece is used for pressing the upper die into the lower die filled with the metal powder; an existing mold pressing device has the problems that a mold is inconvenient to replace and the automation degree is low. According to the automatic metal powder core die casting device, the mold is convenient to replace, and the automation degree is high.

Description

Technical Field

[0001] The present invention relates to the field of die pressing devices for metal powder forming, and particularly to an automatic die casting device for metal powder cores. Background Art

[0002] Metal soft magnetic powder cores (referred to as "metal powder cores" for short) are a kind of soft magnetic materials. They are powders made of metal or alloy soft magnetic materials and are produced into magnetic cores through special processes. Metal powder cores are mainly applied in fields such as new energy vehicles, high-tech communications, and consumer electronics.

[0003] Metal powder cores are made by mixing and pressing powders made of metal or alloy soft magnetic materials with insulating additives. The manufacturing process of metal powder cores is relatively complex. After preparing the raw materials, the raw materials are made into metal powders, an insulating layer is coated on the surface of the metal powders, and then the loose metal powders are pressed into preforms and then annealed and surface-treated.

[0004] Existing die pressing devices usually detachably install a mold, and the mold includes an upper mold and a lower mold. However, because the metal powder has a high hardness, the mold is easily worn and needs to be frequently replaced. When replacing, the machine needs to be stopped for operation, which is rather troublesome and increases the time cost. In addition, feeding and mold switching need to be manually carried out, and the degree of automation is relatively low.

[0005] Therefore, the existing die pressing devices have the problems of inconvenient mold replacement and relatively low degree of automation. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the above-mentioned disadvantages of the prior art and provide an automatic die casting device for metal powder cores with relatively convenient mold replacement and a relatively high degree of automation.

[0007] To solve the above technical problem, an automatic die casting device for metal powder cores provided by the present invention includes a conveying member for conveying the lower mold from front to back. A lower mold loading member for sequentially placing the lower mold at the loading end of the conveying member, a blanking tank for putting metal powder into the lower mold, a compaction member for pre-compacting the metal powder in the lower mold filled with metal powder, and an upper mold loading member for pressing the upper mold onto the lower mold filled with metal powder are installed on the conveying member from front to back.

[0008] As a further improvement of the present invention: The conveying member includes a smooth bottom plate for multiple mutually parallel lower molds to slide from front to back, and baffles respectively vertically installed on the left and right sides of the smooth bottom plate. At least one first telescopic member for pushing the lower mold at the loading end of the smooth bottom plate from front to back is fixedly installed beside the loading end of the smooth bottom plate.

[0009] Preferably, the lower die loading part is a square-ring-shaped first limiting frame fixedly installed on the tops of two baffles for stacking multiple lower dies, and the first limiting frame is located above the loading end of the smooth bottom plate.

[0010] As a further improvement of the present invention: the blanking tank includes an inner column and an outer tank body. A cavity for placing metal powder is formed between the inner wall of the outer tank body and the outer surface of the inner column. The top of the outer tank body is provided with a feed inlet, and a feed funnel is fixedly installed at the feed inlet. The bottom of the outer tank body is provided with a discharge outlet, and a discharge short pipe is fixedly installed at the discharge outlet. A material valve is arranged in the discharge short pipe. A discharge head is arranged below the outer tank body for making the metal powder in the cavity fall into the lower die.

[0011] As a further improvement of the present invention: the compaction part includes a liftable lifting plate and at least one vertical third telescopic part for driving the lifting plate to lift and lower. The bottom of the lifting plate is provided with pressing plates whose number and positions correspond to the female dies at the top of the lower die. The bottom of the pressing plates is provided with compaction blocks matching the shape of the female dies. At least two second return springs are vertically and fixedly installed between each pressing plate and the lifting plate.

[0012] Preferably, a hammer for hitting the pressing plates and a vertical fourth telescopic part for driving the hammer to lift and lower are arranged above the pressing plates.

[0013] As a further improvement of the present invention: the upper die includes a main body for cooperating with the lower die for pressing. Clamping plates capable of sliding in the left-right direction are installed on both the left and right sides of the main body. Sliding cavities for the clamping plates to slide are respectively opened on the left and right sides of the clamping plates. The clamping plates are respectively connected to the inner walls of the sliding cavities through at least one first return spring; the upper die loading part includes a square-ring-shaped second limiting frame for stacking multiple upper dies. The second limiting frame is fixedly installed on the tops of two baffles. Temporary placement grooves for the clamping plates to extend into are opened on the surfaces of the left side wall and the right side wall of the second limiting frame for contacting the clamping plates of the lowermost upper die in the second limiting frame. A vertical second telescopic part for pushing the upper die in the second limiting frame downward is fixedly installed at the top of the second limiting frame.

[0014] As a further improvement of the present invention: a die opening part for opening the upper die and the lower die at the blanking end of the conveying part is arranged at the blanking end of the conveying part.

[0015] The beneficial effects of the present invention are as follows: The mold replacement of the automatic die-casting device for metal powder cores provided by the present invention is relatively convenient and the degree of automation is relatively high; the conveying member of the device can convey the lower mold from front to back. After putting metal powder into the lower mold using the feeding tank and pre-compacting the metal powder in the lower mold through the compaction member, the upper mold is pressed onto the lower mold filled with metal powder by the upper mold feeding member to complete die pressing. If a mold is damaged, it can be directly taken out and no longer used in the production line, and the replacement is very convenient and fast, without the need for shutdown operation, saving time and cost; secondly, the feeding of the lower mold, the feeding of the upper mold, and die pressing are all completed automatically without manual operation, so the degree of automation is relatively high and the efficiency is relatively high. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the lower mold in the present invention; Figure 2 It is a schematic diagram of the overall structure of the upper mold in the present invention; Figure 3 It is a schematic diagram of the positional relationship between the clamping plate and the first return spring in the upper mold of the present invention; Figure 4 It is a schematic perspective view of the overall structure after partial section of the upper mold in the present invention; Figure 5 It is an assembly drawing of the upper mold and the lower mold in the present invention; Figure 6 It is a schematic perspective view of the front view structure of the upper mold and the lower mold in the present invention; Figure 7 It is a schematic diagram of the overall structure of the present invention; Figure 8 It is a schematic diagram of the overall structure of the present invention and the stirring member; Figure 9 It is a schematic diagram of the overall structure of the present invention, the stirring member, multiple upper molds, and multiple lower molds; Figure 10 It is a schematic diagram of the positional relationship between the bracket, the inner column, and the lifting plate in the present invention; Figure 11 It is a schematic diagram of the overall structure of the conveying member and the lower mold feeding member in the present invention; Figure 12 It is a schematic diagram of the positional relationship between the inner column and the stirring rod in the present invention; Figure 13 It is a partial structure schematic diagram of the stirring member in the present invention; Figure 14 It is an assembly drawing of the feeding tank and the stirring member in the present invention; Figure 15 It is a schematic diagram of the overall structure of the upper mold feeding member in the present invention; Figure 16 It is a schematic diagram of the overall structure of the compaction member in the present invention; Figure 17 Schematic diagram of the positional relationship between the mold opening part, two baffle plates, the lower mold, and two clamping plates of the upper mold in the present invention; Figure 18 Schematic diagram of the overall structure of the mold opening part in the present invention.

[0017] The names of the components corresponding to the respective markings in the above-mentioned drawings are: 101, lower mold; 1011, card slot; 102, upper mold; 1021, main body; 1022, clamping plate; 1023, first return spring; 103, bracket; 2, conveying part; 201, smooth bottom plate; 202, baffle plate; 203, first telescopic part; 3, lower mold loading part; 4, blanking tank; 401, inner column; 4011, annular chute; 402, outer tank body; 403, discharge head; 404, scraper; 5, compaction part; 501, lifting plate; 502, third telescopic part; 503, pressing plate; 504, second return spring; 6, upper mold loading part; 601, second limiting frame; 6011, temporary placement groove; 602, second telescopic part; 701, first motor; 702, first gear; 703, second gear; 704, synchronous belt; 705, toothed ring; 706, stirring rod; 707, third gear; 8, mold opening part; 801, inverted U-shaped frame; 802, clamping plate push rod; 803, main body push rod. Detailed implementation manners

[0018] The following further elaborates in detail on the specific implementation manners of the present invention with reference to the drawings.

[0019] In the present invention, the orientation words such as "upper", "lower", "left", "right", "front", "rear", "top", "bottom", etc. are all based on Figure 7 the direction defined by the orientation markings in. The orientation words in the present invention are all described based on this definition and do not change the orientation they represent with the change of the angle of the drawing.

[0020] As Figure 7 , Figure 8 , Figure 9 shown, an automated die-casting device for metal powder cores provided by the present invention includes a conveying part 2 for conveying the lower mold 101 from front to back. The conveying part 2 is equipped with a lower mold loading part 3 for sequentially placing the lower mold 101 at the loading end of the conveying part 2, a blanking tank 4 for putting metal powder into the lower mold 101, a compaction part 5 for pre-compacting the metal powder in the lower mold 101 filled with metal powder, and an upper mold loading part 6 for pressing the upper mold 102 onto the lower mold 101 filled with metal powder from front to back.

[0021] As Figure 7 , Figure 8 , Figure 9 , Figure 11 shown, the conveying member 2 includes a smooth bottom plate 201 for multiple lower dies 101 parallel to each other to slide from front to back, and baffles 202 vertically installed on the left and right sides of the smooth bottom plate 201 respectively. At least one first telescopic member 203 for pushing the lower die 101 at the feeding end of the smooth bottom plate 201 from front to back is fixedly installed beside the feeding end of the smooth bottom plate 201. The lower die feeding member 3 is a square-ring-shaped first limiting frame fixedly installed at the top of the two baffles 202 for stacking multiple lower dies 101, and the first limiting frame is located above the feeding end of the smooth bottom plate 201.

[0022] As Figure 7 , Figure 8 , Figure 9 , Figure 12 , Figure 13 , Figure 14As shown, a bracket 103 is fixedly installed on the top of the two baffles 202. The feed tank 4 includes an inner column 401 fixedly installed below the top of the bracket 103 and an outer tank body 402 that can rotate around the vertical direction. The outer tank body 402 is rotatably installed on the bracket 103. A cavity for placing metal powder is formed between the inner wall of the outer tank body 402 and the outer surface of the inner column 401. A feed port is opened on the top of the outer tank body 402, and the feed port is connected to the cavity. A feed funnel is fixedly installed at the feed port, a discharge port is opened at the bottom of the outer tank body 402, a discharge short tube is fixedly installed at the discharge port, a material valve is arranged in the discharge short tube, a discharge head 403 for allowing the metal powder in the cavity to fall into the lower mold 101 is arranged below the outer tank body 402, the discharge short tube is rotatably sleeved on the outside of the discharge head 403, and a scraper 404 for scraping off excess metal powder by fitting against the top of the lower mold 101 is fixedly installed on the rear side of the discharge head 403. A vertical first motor 701 is fixedly installed on the bracket 103, and the output shaft of the first motor 701 is connected to the outer tank body 402 through a first transmission member, and the first transmission member includes a first gear 702 fixedly sleeved on the output shaft of the first motor 701, and a second gear 703 is fixedly sleeved on the outside of the discharge short tube of the outer tank body 402, and the first gear 702 and the second gear 703 are connected through a synchronous belt 704; a plurality of stirring members capable of stirring the metal powder in the cavity when the outer tank body 402 rotates are vertically rotatably installed between the outer tank body 402 and the inner column 401; the stirring member includes a gear ring 705 fixedly sleeved on the outside of the outer tank body 402, and the teeth of the gear ring 705 are located at the top of the gear ring 705, and a plurality of primary stirring members capable of stirring the metal powder in the cavity when the outer tank body 402 rotates are circumferentially arranged along the outer surface of the outer tank body 402, and the primary stirring member includes a plurality of stirring members arranged on the outer tank body 402 and the inner column 401 from top to bottom and rotating from top to bottom A stirring rod 706, the stirring rod 706 includes a horizontally arranged shaft body capable of rotating in a horizontal direction and a plurality of annular stirring blades arranged along the length direction of the shaft body, the annular stirring blades include a plurality of stirring heads arranged in annularly along the outer surface of the shaft body, the stirring heads are vertically fixedly installed on the outer surface of the shaft body, a plurality of mutually parallel annular slide grooves 4011 are provided on the outer surface of the inner column 401 from top to bottom for the stirring rod 706 to rotate in a vertical direction at one end away from the outer tank body 402, the stirring rod 706 at one end close to the outer tank body 402 passes through the outer tank body 402 and then extends out of the outer tank body 402, the primary stirring member is connected to the gear ring 705 through a second transmission member, the second transmission member includes a third gear 707 rotatably installed on the outer surface of the outer tank body 402, a shaft pulley is installed on the end of the shaft body of the stirring rod 706 in the primary stirring member close to the outer tank body 402, and the shaft pulley is connected to the gear shaft pulley on the gear shaft of the third gear 707 through a belt.

[0023] like Figure 7 , Figure 8 , Figure 9 ,Figure 15 , Figure 16 As shown, the compaction member 5 includes a lift plate 501 capable of lifting and at least one vertical third telescopic member 502 for driving the horizontally arranged lift plate 501 to lift. The lift plate 501 is slidably mounted on the legs of the bracket 103. At least one third telescopic member 502 is fixedly mounted on the top of the bracket 103. At the bottom of the lift plate 501, there are pressing plates 503 with the same number and positions corresponding to the female dies on the top of the lower die 101. Each pressing plate 503 is fixedly connected. At the bottom of the pressing plate 503, there are compaction blocks matching the shape of the female die. At least two second return springs 504 are vertically and fixedly mounted between each pressing plate 503 and the lift plate 501. Above each pressing plate 503, there are hammers capable of lifting for hitting the pressing plate 503 and vertical fourth telescopic members for driving the hammers to lift. The fourth telescopic members are fixedly installed through the lift plate 501. The hammers are fixedly mounted at the top of the telescopic ends of the fourth telescopic members. The bracket 103 is provided with holes for the fourth telescopic members to pass through.

[0024] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 15 As shown, the upper die 102 includes a main body 1021 for cooperating with the lower die 101 for pressing. On the left and right sides of the main body 1021, there are clamping plates 1022 capable of sliding in the left - right direction. The cross - section of the clamping plate 1022 is L - shaped. On the left and right sides of the clamping plate 1022, there are sliding cavities for the clamping plate 1022 to slide respectively. The clamping plates 1022 are respectively connected to the inner walls of the sliding cavities through at least one first return spring 1023. When the distance between the clamping plates 1022 is the farthest, the first return spring 1023 is in a natural elongation state. The upper die feeding member 6 includes a square - ring - shaped second limiting frame 601 for stacking and placing a plurality of upper dies 102. The second limiting frame 601 is fixedly mounted on the tops of two baffles 202. On the left and right side walls of the second limiting frame 601, on the surfaces for contacting the clamping plates 1022 of the lowermost upper die 102 in the second limiting frame 601, there are temporary placement grooves 6011 for the clamping plates 1022 to extend into. At the top of the second limiting frame 601, there is a vertical second telescopic member 602 for pushing the upper die 102 in the second limiting frame 601 downward. On the left and right side walls of the lower die 101, on the surfaces for contacting the clamping plates 1022, there are card slots 1011 for clamping the clamping plates 1022.

[0025] As Figure 7 , Figure 8 , Figure 9 ,Figure 17 , Figure 18 As shown in Figure 18 , an opening die member 8 for opening the upper die 102 and the lower die 101 at the blanking end of the conveying member 2 is provided at the blanking end of the conveying member 2. The opening die member 8 includes an inverted U-shaped frame 801 fixedly installed on the top of the baffle 202. A clamping plate push rod 802 for pushing the clamping plate 1022 in the clamping groove 1011 of the lower die 101 towards the center of the upper die 102 and a main body push rod 803 for pushing the main body 1021 in the lower die 101 upwards are fixedly installed on the front side of the vertical end of the inverted U-shaped frame 801 close to the blanking end of the conveying member 2. The front end faces of the clamping plate push rod 802 and the main body push rod 803 are both in an inclined surface structure.

[0026] The working principle of the present invention is as follows: The upper die 102 is placed in the second limiting frame 601. After the upper die 102 enters the second limiting frame 601, since both clamping plates 1022 are squeezed by the left side wall and the right side wall of the second limiting frame 601, the first return spring 1023 is in a compressed state. The upper die 102 freely falls. When the two clamping plates 1022 reach the bottom of the second limiting frame 601, due to the existence of the temporary placement groove 6011, the clamping plates 1022 are no longer squeezed by the left side wall and the right side wall of the second limiting frame 601, and the first return spring 1023 returns to its initial natural elongation state. The upper die 102 stays at this position and no longer falls. The upper die 102 is continuously stacked and placed. The first return springs 1023 of the upper die 102 on the bottommost upper die 102 are all in a compressed state. A plurality of lower dies 101 are stacked and placed in the frame. The lowermost lower die 101 is located on the feeding end of the smooth bottom plate 201. The surface of the lower die 101 for contacting the upper die 102 faces upwards. When it is necessary to move the lower die 101 backwards, the first telescopic member 203 is activated, and the telescopic end extends, pushing the lower die 101 at the feeding end of the smooth bottom plate 201 backwards. When the telescopic end shortens, after losing the support of the original lower die 101 at this position and the block of the telescopic end, the lower die 101 above the original lower die 101 at the feeding end of the smooth bottom plate 201 will naturally fall to the feeding end of the smooth bottom plate 201 under the action of gravity.

[0027] Pour the metal powder from the feeding funnel into the cavity, start the first motor 701, the output shaft of the first motor 701 drives the first gear 702 to rotate, the first gear 702 drives the second gear 703 to rotate through the synchronous belt 704, thereby driving the outer tank body 402 to rotate. When the outer tank body 402 rotates, it drives a plurality of stirring rods 706 to rotate. One end of the plurality of stirring rods 706 away from the outer tank body 402 slides in the annular chute 4011 on the surface of the inner column 401. At the same time, the outer tank body 402 drives the gear ring 705 to rotate, and the gear ring 705 drives each third gear 707 to rotate around the horizontal direction. Each third gear 707 drives the primary stirring member to rotate through the belt respectively, so that while the whole of each stirring rod 706 rotates around the vertical direction, it also rotates around the horizontal direction, thus fully stirring the materials in the cavity.

[0028] After the stirring is completed, when the lower die 101 reaches below the discharging head 403, the valve opens, and the metal powder falls into the lower die 101. After reaching the expected amount, the valve is closed. As the first telescopic member 203 pushes the lower die 101 at the feeding end of the smooth bottom plate 201, the other lower dies 101 on the smooth bottom plate 201 will also continue to slide backward. The bottom of the scraper 404 contacts the bottom of the lower die 101, and during the backward movement of the lower die 101, the excess metal powder on its top is scraped off.

[0029] When the lower die 101 with the compacted metal powder reaches directly below the upper die 102, the telescopic end of the second telescopic member 602 extends, driving the upper dies 102 in the second limiting frame 601 to move downward. Under the action of the downward force, the clamping plate 1022 of the lowermost upper die 102 is squeezed by the lower edge of the temporary placement groove 6011, and the first return spring 1023 is gradually compressed. The lowermost upper die 102 continues to fall into the lower die 101 until the clamping plate 1022 reaches the clamping groove 1011 of the lower die 101, and the first return spring 1023 returns to the natural elongation state, and the clamping plate 1022 is clamped in the clamping groove 1011. And the upper die 102 above the lowermost upper die 102 before reaches the lowermost layer, and the two clamping plates 1022 respectively enter the temporary placement groove 6011.

[0030] The metal powder in the upper die 102 and the lower die 101 is pressed into shape. The lower die 101 drives the upper die 102 to continue moving backward on the smooth bottom plate 201. The length of the clamping plate push rod 802 is longer than that of the main body push rod 803. Therefore, the clamping plate push rod 802 will first extend into the clamping groove 1011 and squeeze the clamping plate 1022 towards the center of the upper die 102. Subsequently, the main body push rod 803 will be inserted between the main body 1021 and the lower die 101, and push the main body 1021 upward to open the mold. At this time, the preform and the mold can be taken out.

[0031] It should be noted that the present invention is not limited to the specific structures shown in the accompanying drawings in the above embodiments, and various changes can be made within the scope of knowledge possessed by those of ordinary skill in the art.

Claims

1. A metal powder core automatic die casting device, characterized in that: The invention comprises a conveying member (2) for conveying a lower die (101) from front to back, and a lower die loading member (3) for sequentially placing the lower die (101) on a loading end of the conveying member (2), a loading tank (4) for placing metal powder into the lower die (101), a compacting member (5) for pre-compacting the metal powder in the lower die (101) containing the metal powder, and an upper die loading member (6) for pressing an upper die (102) into the lower die (101) containing the metal powder, are installed on the conveying member (2) from front to back.

2. The metal powder core automatic die casting device according to claim 1, characterized in that: The conveying member (2) comprises a smooth bottom plate (201) for a plurality of mutually parallel lower dies (101) to slide from front to back, and baffles (202) respectively mounted vertically on the left and right sides of the smooth bottom plate (201), and at least one first telescopic member (203) is fixedly mounted horizontally next to the feeding end of the smooth bottom plate (201) for pushing the lower dies (101) at the feeding end of the smooth bottom plate (201) from front to back.

3. The metal powder core automatic die casting device according to claim 2, characterized in that: The lower mold loading piece (3) is a square ring-shaped first limiting frame fixedly mounted on the top of the two baffles (202) and used for stacking multiple lower molds (101). The first limiting frame is located above the loading end of the smooth bottom plate (201).

4. The metal powder core automated die casting device according to any one of claims 1 to 3, characterized in that: The feed tank (4) comprises an inner column (401) and an outer tank body (402); a cavity for placing metal powder is formed between the inner wall of the outer tank body (402) and the outer surface of the inner column (401); a feed port is provided at the top of the outer tank body (402); a feed funnel is fixedly installed at the feed port; a discharge port is provided at the bottom of the outer tank body (402); a discharge short pipe is fixedly installed at the discharge port; a material valve is provided in the discharge short pipe; a discharge head (403) is provided below the outer tank body (402) for allowing the metal powder in the cavity to fall into the lower mold (101).

5. The metal powder core automated die casting device according to any one of claims 1 to 3, characterized in that: The compacting member (5) comprises a lifting plate (501) capable of being raised and lowered, and at least one vertical third telescopic member (502) for driving the lifting plate (501) to be raised and lowered; a pressing plate (503) whose number and position correspond to the concave die at the top of the lower die (101) is arranged at the bottom of the lifting plate (501); a compacting block whose shape matches the concave die is arranged at the bottom of the pressing plate (503); and at least two second return springs (504) are vertically fixedly installed between each pressing plate (503) and the lifting plate (501).

6. The metal powder core automatic die casting device according to claim 5, characterized in that: A hammer capable of being raised and lowered for striking the pressing plate (503) and a fourth vertical telescopic member for driving the hammer to be raised and lowered are provided above the pressing plate (503).

7. The metal powder core automated die casting device according to any one of claims 1 to 3, characterized in that: The upper die (102) comprises a main body (1021) for cooperating with the lower die (101) for pressing, and a card plate (1022) capable of sliding in the left and right directions is installed on both the left and right sides of the main body (1021), and a sliding cavity for sliding the card plate (1022) is respectively provided on the left and right sides, and the card plate (1022) is connected to the inner wall of the sliding cavity via at least one first return spring (1023); The upper mold loading member (6) comprises a square ring-shaped second limiting frame (601) for stacking a plurality of upper molds (102); the second limiting frame (601) is fixedly mounted on the top of two baffles (202); a temporary placement groove (6011) for the clamping plate (1022) to extend into is provided on the left side wall and the right side wall of the second limiting frame (601) for contacting the clamping plate (1022) of the bottom upper mold (102) in the second limiting frame (601); and a vertical second telescopic member (602) for pushing the upper mold (102) in the second limiting frame (601) downward is fixedly mounted on the top of the second limiting frame (601).

8. The metal powder core automatic die casting device according to any one of claims 1 to 3, characterized in that: The unloading end of the conveying member (2) is provided with a mold opening member (8) for opening the upper mold (102) and the lower mold (101) at the unloading end.

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