Die-casting forming device for aluminum alloy automobile engine end cover

Abstract

According to the die-casting forming device for the aluminum alloy automobile engine end cover, the rotating shaft is installed on the base plate, and the rotating shaft is driven by the intermittent driving assembly to achieve intermittent rotation; a water spraying box is fixedly installed on the rotating shaft, at least one water groove is formed in the water spraying box, a water tank is fixed to the base plate, a quantitative drainage assembly is arranged at the bottom of the water tank, and after the water spraying box intermittently rotates to the quantitative drainage assembly, the quantitative drainage assembly can drain part of water in the water tank, and the water is contained in the water groove; a first electric expansion piece is fixedly installed on one side of the lower die and controls a first telescopic rod, push rods with the same number as the water tanks are fixed to one side of the first telescopic rod, when the water spraying box intermittently rotates to the lower side of the fixing table along with the rotating shaft, the water tanks can be aligned to the push rods, and the first electric expansion piece drives the push rods to be inserted into the water tanks; and therefore, water in the water tank is sprayed out from each nozzle on the water spraying pipe to spray water to cool the lower die, so that the aluminum alloy engine end cover blank on the lower die can be quickly cooled.

Description

Technical Field

[0001] The invention relates to the field of die-casting equipment, in particular to a die-casting forming device for an aluminum alloy automobile engine end cover. Background Art

[0002] Die casting is a common metal casting process that utilizes the inner cavity of a mold to apply pressure to molten metal to produce the desired part. In automotive production, die casting is often used, particularly for aluminum alloy parts such as engine casings, engine covers, and wheels. Die casting processes are categorized into low-pressure and high-pressure casting. Low-pressure casting offers high precision but slow speed, while high-pressure casting offers high speed but low precision. Both die-casting processes play a key role in automotive production, depending on the needs of the user.

[0003] Among them, in existing low-pressure casting equipment, the cooling method is often to set a cavity in the mold and perform water cooling circulation. This cooling method often has a relatively low cooling efficiency, and the overall water cooling system will be very complicated, and the production and maintenance costs are very high. Summary of the Invention

[0004] The purpose of the present invention is to provide an aluminum alloy automobile engine end cover die-casting forming device to solve the above problems.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: A die-casting device for an aluminum alloy automobile engine end cover comprises a base, a first side plate is fixedly mounted on the base, and a lower die is fixedly mounted on the first side plate;

[0006] A second side plate is fixed on the lower die, an upper die is provided on one side of the second side plate, and the upper die is connected to a lifting assembly;

[0007] An injection hole is provided on the lower mold, a bottom plate is fixed on the first side plate, a crucible is fixedly installed on the bottom plate, and a liquid riser connected to the injection hole is provided on the crucible;

[0008] Injecting the molten aluminum alloy in the crucible into the cavity formed by the upper mold and the lower mold through a pressurizing component;

[0009] A base plate is fixed on one side of the base, and a cooling assembly is installed on the base plate, wherein the cooling assembly includes a rotating shaft rotatably arranged on the base plate, and the rotating shaft is driven by an intermittent driving assembly to realize intermittent rotation;

[0010] A water spray box is fixedly mounted on the rotating shaft, the water spray box is provided with at least one water trough with a top opening, the water trough is connected to a water spray pipe fixed to the water spray box, and a plurality of nozzles are mounted on the top of the water spray pipe;

[0011] A frame is fixedly provided on the base plate, a water tank is fixedly installed on the frame, and a quantitative drainage component is provided at the bottom of the water tank;

[0012] A fixed platform is fixed on one side of the lower mold, a No. 1 electric telescopic device is fixedly installed on the fixed platform, the No. 1 electric telescopic device controls a No. 1 telescopic rod, a connecting piece is fixed on one side of the No. 1 telescopic rod, and a push rod with the same number as the water tanks is fixed on one side of the connecting piece;

[0013] A control box is fixedly mounted on the base plate.

[0014] Preferably, the push rod has the same cross-sectional shape as that of the water tank.

[0015] Preferably, a cooling chamber is opened at the center of the bottom of the lower mold, and a No. 1 fin is fixedly installed in the cooling chamber, and a number of No. 2 fins are also fixed at other positions on the bottom of the lower mold.

[0016] Preferably, a box is mounted on the base, and the box is detachable.

[0017] Preferably, the pressurizing assembly includes a gas cylinder and an air pump fixed to one side of the No. 1 side plate, a gas nozzle is provided on the top of the crucible, the gas cylinder and the air pump are connected by a hose, and the air pump and the gas nozzle are also connected by a hose.

[0018] Preferably, the intermittent drive assembly includes a groove wheel fixed on the rotating shaft, the groove wheel is equipped with a disc, a pin is fixed on the disc, one side of the disc is fixed to the motor shaft of motor No. 1, and the motor No. 1 is fixedly mounted on the base plate.

[0019] Preferably, the lifting assembly includes a top plate fixed on the top of the No. 2 side plate, a No. 2 electric telescopic device is fixedly installed on the top plate, the No. 2 electric telescopic device controls a No. 2 telescopic rod, the No. 2 telescopic rod is fixed to the upper mold, at least one slide rail is fixed on the No. 2 side plate, a slider is slidably installed in the slide rail, and the slider is fixed to the upper mold.

[0020] Preferably, the quantitative drainage assembly includes a connecting block fixed to the water tank, a groove is opened in the connecting block, a water collection trough is set in the water tank, the water collection trough is used to store water, an opening is set at the bottom of the water collection trough to connect to the groove in the connecting block, a water supply block is rotatably installed in the connecting block, a water supply trough is opened on the water supply block, a No. 2 motor is fixedly installed on the outside of the connecting block, the motor shaft of the No. 2 motor is fixed to the water supply block, and water supply pipes with the same number as the water troughs are fixed at the bottom of the connecting block, and the water supply pipes are connected to the grooves of the connecting block.

[0021] In summary, the present invention has the following beneficial effects:

[0022] 1. A base plate is fixed on one side of the base of the present application, and a cooling assembly is installed on the base plate. The cooling assembly includes a rotating shaft rotatably arranged on the base plate, and the rotating shaft is driven by an intermittent driving assembly to realize intermittent rotation; a water spray box is fixedly installed on the rotating shaft, and at least one water trough with a top opening is provided on the water spray box, and the water trough is connected to a water spray pipe fixed to the water spray box, and a plurality of nozzles are installed on the top of the water spray pipe; a water tank is fixed on the base plate, and the water tank is used to hold water. A quantitative drainage assembly is arranged at the bottom of the water tank. After the water spray box intermittently rotates with the rotating shaft with the quantitative drainage assembly, the quantitative drainage assembly can discharge a part of the water in the water tank and fill it In the water tank; a fixed table is fixed on one side of the lower mold, and an electric telescopic device No. 1 is fixed on the fixed table. The electric telescopic device No. 1 controls the telescopic rod No. 1, and a connecting piece is fixed on one side of the No. 1 telescopic rod. Push rods that are the same in number as the water tanks are fixed on one side of the connecting piece. When the water spray box rotates intermittently to the lower side of the fixed table along with the rotating shaft, the water tank will be aligned with the push rods, and the No. 1 electric telescopic device controls the No. 1 telescopic rod to descend to drive the push rod to be inserted into the water tank, thereby spraying water in the water tank from various nozzles on the water spray pipe to cool the lower mold, so that the aluminum alloy engine end cover blank on the lower mold can be quickly cooled.

[0023] 2. A cooling chamber is opened at the center of the bottom of the lower mold. Fin No. 1 is fixed in the cooling chamber, and several fin No. 2 are also fixed at other positions on the bottom of the lower mold. The arrangement of fin No. 2 and fin No. 1 makes the contact area and contact time between the lower mold and water longer, greatly optimizing the cooling effect. In addition, this water cooling method sprayed through the nozzle can also increase the contact area between the lower mold and water, further optimizing the cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 is a first schematic diagram of the appearance of an embodiment of the present invention;

[0026] Figure 2 This is a second schematic diagram of the appearance of an embodiment of the present invention;

[0027] Figure 3 yes Figure 2 A in the middle is an enlarged schematic diagram;

[0028] Figure 4 is a third schematic diagram of the appearance of an embodiment of the present invention;

[0029] Figure 5is a fourth schematic diagram of the appearance of an embodiment of the present invention;

[0030] Figure 6 is a cross-sectional view of an embodiment of the present invention;

[0031] Figure 7 yes Figure 6 The enlarged schematic diagram of point B in the middle;

[0032] Figure 8 It is a cross-sectional view of the spray box.

[0033] In the figure: 10, base; 11, box; 12, side panel No. 1; 13, bottom plate; 14, crucible; 15, lower mold; 16, side panel No. 2; 17, slide rail; 18, upper mold; 19, top plate; 20, slide; 21, electric telescopic device No. 2; 22, telescopic rod No. 2; 23, injection hole; 24, water tank; 25, frame; 26, base plate; 27, control box; 28, motor No. 1; 29, rotating shaft; 30, water spray box; 31, water spray pipe; 32, gas cylinder; 33, gas Pump; 34. Water tank; 35. Push rod; 36. No. 2 fin; 37. No. 1 electric telescope; 38. Fixed platform; 39. Connecting plate; 40. Connecting block; 41. No. 2 motor; 42. Water pipe; 43. No. 1 telescopic rod; 44. Grooved wheel; 45. Disc; 46. Pin; 47. Lifting pipe; 48. Cooling chamber; 49. No. 1 fin; 50. Water block; 51. Water tank; 52. Opening; 53. Water collecting tank; 54. Nozzle; 55. Air nozzle; 60. Cooling assembly. DETAILED DESCRIPTION

[0034] Combined with attachment Figures 1-8 The die-casting device for an aluminum alloy automobile engine end cover comprises a base 10, a first side plate 12 is fixedly mounted on the base 10, and a lower die 15 is fixedly mounted on the first side plate 12:

[0035] A second side plate 16 is fixed to the lower die 15, and an upper die 18 is provided on one side of the second side plate 16. The upper die 18 is connected to a lifting assembly, which enables the upper die 18 to be raised and lowered relative to the second side plate 16. The upper die 18 is combined with the lower die 15 under the control of the lifting assembly to form a cavity for die casting.

[0036] An injection hole 23 is provided on the lower mold 15 for injecting molten aluminum alloy liquid. A bottom plate 13 is fixed on the first side plate 12, and a crucible 14 is fixedly mounted on the bottom plate 13. The crucible 14 contains molten aluminum alloy liquid. A riser pipe 47 connected to the injection hole 23 is provided on the crucible 14.

[0037] The molten aluminum alloy liquid in the crucible 14 is injected into the cavity formed by the upper mold 18 and the lower mold 15 in a pressurized form, which is achieved by a pressurizing component. The pressurizing component includes a gas cylinder 32 and an air pump 33 fixed to one side of the No. 1 side plate 12. A gas nozzle 55 is provided on the top of the crucible 14. The gas cylinder 32 and the air pump 33 are connected by a hose. The air pump 33 and the gas nozzle 55 are also connected by a hose (the hose is relatively soft and affects the observation of other structures, so it is not shown in the figure). The gas cylinder 32 is generally filled with dry compressed gas or inert gas. The gas in the gas cylinder 32 is pumped into the crucible 14 by the air pump 33, and the molten aluminum alloy liquid in the crucible 14 is discharged from the injection hole 23 through the riser pipe 47;

[0038] After the aluminum alloy liquid is cooled, an aluminum alloy engine end cover blank is formed. At this time, the air pump 33 is controlled to draw back the gas in the crucible 14, and the aluminum alloy liquid will fall back into the crucible 14 (this part is the basic content of low-pressure casting and is well known to people in this field. As for how to control the gas and how to control the amount of aluminum alloy liquid, they are common technologies in this field and will not be expanded here). Then the upper mold 18 is controlled to rise, and the aluminum alloy engine end cover blank can be manually removed.

[0039] A base plate 26 is fixed on one side of the base 10, and a cooling assembly 60 is installed on the base plate 26. The cooling assembly 60 includes a rotating shaft 29 rotatably arranged on the base plate 26, and the rotating shaft 29 is driven by an intermittent drive assembly to realize intermittent rotation. The intermittent drive assembly includes a groove wheel 44 fixed on the rotating shaft 29, and the groove wheel 44 is matched with a disc 45. A pin 46 is fixed on the disc 45. One side of the disc 45 is fixed to the motor shaft of the No. 1 motor 28. The No. 1 motor 28 is fixedly mounted on the base plate 26. After the No. 1 motor 28 is started, the disc 45 is driven to rotate, and the disc 45 drives the pin 46 to rotate intermittently, thereby driving the groove wheel 44 to rotate intermittently, and the rotating shaft 29 rotates intermittently with the groove wheel 44;

[0040] A water spray box 30 is fixedly mounted on the rotating shaft 29. The water spray box 30 defines at least one water trough 34 with an open top. The water trough 34 is connected to a water spray pipe 31 fixed to the water spray box 30. A plurality of nozzles 54 are mounted on the top of the water spray pipe 31.

[0041] A frame 25 is fixedly mounted on the base plate 26, and a water tank 24 is fixedly mounted on the frame 25. The water tank 24 is used to store water. A quantitative drainage assembly is provided at the bottom of the water tank 24. When the water spray box 30 rotates intermittently with the rotating shaft 29 to drive the quantitative drainage assembly, the quantitative drainage assembly can discharge a portion of the water in the water tank 24 and store it in the water tank 34.

[0042] A fixed platform 38 is fixed on one side of the lower mold 15, and a No. 1 electric telescopic device 37 is fixedly installed on the fixed platform 38. The No. 1 electric telescopic device 37 controls a No. 1 telescopic rod 43. A connecting piece 39 is fixed on one side of the No. 1 telescopic rod 43. A push rod 35 with the same number as the water troughs 34 is fixed on one side of the connecting piece 39. When the water spray box 30 rotates intermittently to the lower side of the fixed platform 38 along with the rotating shaft 29 (the water spray pipe 31 is facing the bottom of the lower mold 15), the water trough 34 will be aligned with the push rod 35, and the No. 1 electric telescopic device 37 controls the No. 1 telescopic rod 43 to descend to drive the push rod 35 to insert into the water trough 34, so that the water in the water trough 34 is sprayed out from each of the nozzles 54 on the water spray pipe 31 to spray water to cool the lower mold 15, so that the aluminum alloy engine end cover blank on the lower mold 15 can be quickly cooled;

[0043] It should be noted that the push rod 35 has the same cross-sectional shape as the water tank 34, and the push rod 35 has a certain sealing performance after being inserted into the water tank 34, thereby ensuring that the push rod 35 can drain the water in the water tank 34;

[0044] To optimize the cooling effect, a cooling chamber 48 is provided at the center of the bottom of the lower mold 15. A No. 1 fin 49 is fixedly mounted in the cooling chamber 48. A number of No. 2 fins 36 are also fixed at other locations on the bottom of the lower mold 15. The arrangement of the No. 2 fins 36 and the No. 1 fins 49 prolongs the contact area and contact time between the lower mold 15 and the water, greatly optimizing the cooling effect. In addition, the water cooling method sprayed through the nozzle 54 can also increase the contact area between the lower mold 15 and the water, further optimizing the cooling effect.

[0045] A box 11 is installed on the base 10 to catch the sprayed cooling water. The box 11 is detachable for convenient timed water pouring.

[0046] The lifting assembly includes a top plate 19 fixed on the top of the No. 2 side plate 16, and a No. 2 electric telescopic device 21 is fixedly installed on the top plate 19. The No. 2 electric telescopic device 21 controls a No. 2 telescopic rod 22, and the No. 2 telescopic rod 22 is fixed to the upper mold 18. The No. 2 electric telescopic device 21 controls the extension and contraction of the No. 2 telescopic rod 22 to control the lifting and lowering of the upper mold 18. In order to optimize the stability of the lifting and lowering of the top plate 19, at least one slide rail 17 is fixedly provided on the No. 2 side plate 16, and a slider 20 is slidably installed in the slide rail 17, and the slider 20 is fixed to the upper mold 18.

[0047] The quantitative drainage assembly includes a connecting block 40 fixed to the water tank 24, a groove is formed in the connecting block 40, a water collecting tank 53 is provided in the water tank 24, the water collecting tank 53 is used to store water, an opening 52 is provided at the bottom of the water collecting tank 53 to communicate with the groove in the connecting block 40, a water delivery block 50 is rotatably installed in the connecting block 40, a water delivery groove 51 is provided on the water delivery block 50, and a second motor 41 is fixedly installed on the outside of the connecting block 40, and the motor shaft of the second motor 41 is connected to the water delivery block 51. 0 is fixed, and the bottom of the connecting block 40 is fixed with water pipes 42 having the same number as the water troughs 34. The water pipes 42 are connected to the grooves of the connecting block 40. When the water spray box 30 rotates intermittently with the rotating shaft 29 to the bottom of the connecting block 40, the water pipes 42 are opposite to the water troughs 34. At this time, the No. 2 motor 41 is started, and the No. 2 motor 41 drives the water delivery block 50 to rotate one circle, pouring the water in the water troughs 51 from the water pipes 42 into each of the water troughs 34.

[0048] A control box 27 is fixedly mounted on the base plate 26 . The operations of the No. 1 motor 28 , the No. 2 electric retractor 21 , the air pump 33 and the No. 1 electric retractor 37 are all controlled by the control box 27 , and a control program may be a PLC.

[0049] Directions:

[0050] The control box 27 is used to start the process. The control box 27 first controls the second electric telescopic device 21 to start, and the second electric telescopic device 21 controls the second telescopic rod 22 to extend. The second telescopic rod 22 drives the upper mold 18 and the lower mold 15 to form a cavity for die casting. The air pump 33 is then controlled to pump the gas in the gas cylinder 32 into the crucible 14, and the molten aluminum alloy in the crucible 14 is discharged from the injection hole 23 through the riser pipe 47 to fill the cavity.

[0051] After completion, the control box 27 controls the No. 1 motor 28 to start, and the No. 1 motor 28 drives the disc 45 to rotate, and the disc 45 drives the pin 46 to rotate intermittently, thereby driving the sheave 44 to rotate intermittently, and the rotating shaft 29 rotates intermittently along with the sheave 44, and the water spray box 30 rotates intermittently along with the slider 20;

[0052] When the water spray box 30 rotates intermittently along with the rotating shaft 29 to the bottom of the connecting block 40, the water pipe 42 is aligned with the water trough 34. At this time, the second motor 41 is activated by the control box 27, and the second motor 41 drives the water delivery block 50 to rotate one circle, pouring the water in the water delivery trough 51 from the water pipe 42 into each of the water troughs 34.

[0053] When the water spray box 30 rotates intermittently along with the rotating shaft 29 to the lower side of the fixed platform 38 (the water spray pipe 31 faces the bottom of the lower mold 15), the water trough 34 is aligned with the push rod 35, and the control box 27 controls the No. 1 electric telescopic device 37 to start, and the No. 1 electric telescopic device 37 controls the No. 1 telescopic rod 43 to descend to drive the push rod 35 to insert into the water trough 34, so that the water in the water trough 34 is sprayed out from the various nozzles 54 on the water spray pipe 31 to spray water to cool the lower mold 15;

[0054] After spraying, the No. 1 electric telescopic device 37 retracts the No. 1 telescopic rod 43, and then the control box 27 controls the rotating shaft 29 to rotate and reset, and the control box 27 controls the upper mold 18 to rise and reset. At this time, the aluminum alloy engine end cover blank that has been cooled on the crucible 14 can be taken away.

[0055] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand and implement the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made in accordance with the spirit of the present invention are intended to be covered by the scope of protection of the present invention.

Claims

1. A die-casting device for an aluminum alloy automobile engine end cover, comprising a base (10), a No. 1 side plate (12) fixedly mounted on the base (10), a lower die (15) fixedly mounted on the No. 1 side plate (12); a No. 2 side plate (16) fixedly mounted on the lower die (15), an upper die (18) arranged on one side of the No. 2 side plate (16), and the upper die (18) connected to a lifting assembly; an injection hole (23) is provided on the lower die (15), a bottom plate (13) fixedly mounted on the No. 1 side plate (12), a crucible (14) fixedly mounted on the bottom plate (13), and a liquid riser (47) connected to the injection hole (23) is arranged on the crucible (14); molten aluminum alloy liquid in the crucible (14) is injected into a cavity formed by the upper die (18) and the lower die (15) through a pressurizing assembly, characterized in that: A base plate (26) is fixed on one side of the base (10), and a cooling assembly (60) is installed on the base plate (26). The cooling assembly (60) includes a rotating shaft (29) rotatably arranged on the base plate (26), and the rotating shaft (29) is driven by an intermittent driving assembly to realize intermittent rotation; A water spray box (30) is fixedly mounted on the rotating shaft (29), and at least one water trough (34) with an opening at the top is provided on the water spray box (30). The water trough (34) is connected to a water spray pipe (31) fixed to the water spray box (30), and a plurality of nozzles (54) are mounted on the top of the water spray pipe (31); A frame (25) is fixedly arranged on the base plate (26), a water tank (24) is fixedly mounted on the frame (25), and a quantitative drainage assembly is arranged at the bottom of the water tank (24); A fixed platform (38) is fixed on one side of the lower mold (15), and a No. 1 electric telescopic device (37) is fixedly installed on the fixed platform (38). The No. 1 electric telescopic device (37) controls a No. 1 telescopic rod (43). A connecting piece (39) is fixed on one side of the No. 1 telescopic rod (43), and a number of push rods (35) that is the same as the number of the water tanks (34) is fixed on one side of the connecting piece (39); A control box (27) is fixedly mounted on the base plate (26).

2. The die-casting device for an aluminum alloy automobile engine end cover according to claim 1, characterized in that: The push rod (35) has the same cross-sectional shape as the water tank (34).

3. The die-casting device for an aluminum alloy automobile engine end cover according to claim 1, characterized in that: A cooling chamber (48) is provided at the center of the bottom of the lower mold (15), a No. 1 fin (49) is fixedly installed in the cooling chamber (48), and a plurality of No. 2 fins (36) are also fixed at other positions on the bottom of the lower mold (15).

4. The die-casting device for an aluminum alloy automobile engine end cover according to claim 1, characterized in that: A box (11) is installed on the base (10), and the box (11) is detachable.

5. The die-casting device for an aluminum alloy automobile engine end cover according to claim 1, characterized in that: The pressurizing assembly includes a gas cylinder (32) and an air pump (33) fixed to one side of the first side plate (12), a gas nozzle (55) is provided on the top of the crucible (14), the gas cylinder (32) and the air pump (33) are connected through a hose, and the air pump (33) and the gas nozzle (55) are also connected through a hose.

6. The die-casting device for an aluminum alloy automobile engine end cover according to claim 1, characterized in that: The intermittent drive assembly includes a groove wheel (44) fixed on the rotating shaft (29), the groove wheel (44) is matched with a disc (45), a pin (46) is fixed on the disc (45), one side of the disc (45) is fixed to the motor shaft of the No. 1 motor (28), and the No. 1 motor (28) is fixedly mounted on the base plate (26).

7. The die-casting device for an aluminum alloy automobile engine end cover according to claim 1, characterized in that: The lifting assembly includes a top plate (19) fixed on the top of the second side plate (16), a second electric telescopic device (21) is fixedly installed on the top plate (19), the second electric telescopic device (21) controls a second telescopic rod (22), the second telescopic rod (22) is fixed to the upper mold (18), at least one slide rail (17) is fixed on the second side plate (16), a slider (20) is slidably installed in the slide rail (17), and the slider (20) is fixed to the upper mold (18).

8. The die-casting device for an aluminum alloy automobile engine end cover according to claim 1, characterized in that: The quantitative drainage assembly comprises a connecting block (40) fixed to the water tank (24), a groove is formed in the connecting block (40), a water collecting trough (53) is provided in the water tank (24), the water collecting trough (53) is used for storing water, an opening (52) is provided at the bottom of the water collecting trough (53) and is connected to the groove in the connecting block (40), a water delivery block (50) is rotatably installed in the connecting block (40), a water delivery trough (51) is provided on the water delivery block (50), a No. 2 motor (41) is fixedly installed outside the connecting block (40), the motor shaft of the No. 2 motor (41) is fixed to the water delivery block (50), and a number of water delivery pipes (42) equal to the number of the water troughs (34) are fixed at the bottom of the connecting block (40), and the water delivery pipes (42) are connected to the grooves of the connecting block (40).

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