Cooling structure of die-casting die

Abstract

The cooling structure of the die-casting die comprises a fixed die and a cavity formed in the fixed die and used for containing a flowing heat absorption medium, and further comprises an elastic bag arranged at the center of the cavity and distributed close to the cavity, the elastic bag is fixed to the left end face of a base, the base is fixed in the cavity, and the elastic bag is arranged in the cavity. The elastic bag is filled with a heat exchange medium, and the heat exchange medium is used for absorbing heat in the flowing heat absorption medium. According to the cooling structure of the die-casting die, the cooling structure is reset, a heat exchange medium is used for effectively cooling a heat absorption medium, circulating flowing and cooling operation of the heat exchange medium are achieved through movement of a guide rod in the die assembly and demolding processes, and after demolding, effective spraying cooling can be conducted on the surface of a material, so that the cooling effect is improved. And meanwhile, the surface of the cavity is effectively cooled and cleaned, the structural design is reasonable, and more energy conservation and environmental protection are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of die-casting dies, in particular to a cooling structure of a die-casting die. Background Art

[0002] The die casting mold is also divided into two parts: the fixed mold and the movable mold. After the fixed mold and the movable mold are closed, the molten material (mostly metal) enters the cavity through the runner. After molding, the material is taken out through the clamp. Although the solid material has a lower temperature than the molten state, it is made of metal and it takes a lot of time to cool down naturally. Therefore, in the prior art, a corresponding cooling structure (with oil, water or a mixture of fluid as the medium) is set in the movable mold or the fixed mold to cool the material. However, the existing cooling structure still has the following problems in actual use: In order to ensure the cooling efficiency of the cooling medium, the cooling medium needs to flow back to the pump mechanism for re-cooling after fully absorbing heat. However, due to the high temperature of the molten material itself, the temperature of the cooling medium will also increase accordingly. After flowing back to the pumping mechanism, the operating load of the cooling facility for cooling the medium will also increase accordingly, resulting in unsatisfactory actual cooling effect. Summary of the invention

[0003] The object of the present invention is to provide a cooling structure for a die-casting mold to solve the problem proposed in the above background technology that in order to ensure the cooling efficiency of the cooling medium, the cooling medium needs to flow back to the pump mechanism for re-cooling operation after fully absorbing heat. However, since the temperature of the molten material itself is relatively high, the temperature of the cooling medium will also increase accordingly, and after flowing back to the pumping mechanism, the operating load of the cooling facility for cooling the medium will also increase accordingly, resulting in the problem that the actual cooling effect is unsatisfactory.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a cooling structure of a die-casting mold, comprising a fixed mold and a cavity opened inside the fixed mold for accommodating a flowing heat-absorbing medium, the top and bottom ends of the cavity are respectively connected to two water pipes, a mold cavity is opened on the left end surface of the fixed mold, and a guide rod slidably connected to the fixed mold is arranged on the side of the mold cavity, the guide rod is fixed on the movable mold for guiding the stable movement of the movable mold, and also includes an elastic bag arranged at the center of the cavity and distributed close to the mold cavity, the elastic bag is fixed on the left end surface of the base, and the base is fixed in the cavity, the elastic bag is filled with a heat exchange medium, and the heat exchange medium is used to absorb heat in the flowing heat-absorbing medium.

[0005] Preferably, the heat exchange medium circulates through the flow device and in the low-temperature area inside the elastic bag and the cavity.

[0006] Preferably, the flow device includes a transverse cylinder and a connecting tube, the tail end of the connecting tube is connected to the interior of the elastic bag, and the top end is connected to the interior of the transverse cylinder, the transverse cylinder is fixed at the corner of the left end surface of the fixed mold, and a valve plate is slidably arranged inside the transverse cylinder, the valve plate is fixedly connected to the tail end of the guide rod, and the guide rod is slidably installed in the transverse cylinder.

[0007] Preferably, a horizontally penetrating spray hole is provided on the mold cavity, and a baffle rod whose end matches the inner diameter of the spray hole is slidably provided in the spray hole, and the baffle rod is installed on the left side wall of the vertical plate. At the same time, the vertical plate is connected to a driving device, and the driving device is used to drive the baffle rod to slide left and right inside the spray hole through the vertical plate, and a leakage mechanism is provided on the baffle rod, which is used to spray the heat-absorbing medium from the leakage mechanism after the end of the baffle rod extends out of the spray hole.

[0008] Preferably, the driving device consists of a cam and a motor shaft directly connected thereto, the horizontally distributed outer surface of the cam is attached to the left side of the top of the vertical plate, the cam is connected to the bottom end of the motor shaft, the top end of the motor shaft passes through the top wall of the fixed mold and is connected to the motor, and the vertical plate is horizontally elastically slidably connected to the inside of the cavity by a spring.

[0009] Preferably, a diverter rod is also provided at the end of the baffle rod, and the diverter rod is slidably connected to the inside of the baffle rod through a vertical spring, and the right side of the top end of the diverter rod is a curved structure. When the end of the baffle rod is located inside the spray hole, the diverter rod is retracted inside the end of the baffle rod, and the tail end of the baffle rod is also connected to a rotating device, and the rotating device is used to drive the baffle rod to rotate after the baffle rod extends out of the spray hole, and the middle section of the baffle rod is horizontally slidably connected to the connecting ring, and the connecting ring is rotatably mounted on the partition inside the cavity.

[0010] Preferably, the rotating device includes a water box fixed on the vertical plate, an impeller arranged inside the water box and fixed at the right end of the baffle rod, the water box is connected to a branch pipe, both ends of the branch pipe are respectively connected to the input port and output port of the water pump assembly, the water flows in the water box and drives the baffle rod to rotate through the impeller 21.

[0011] Preferably, the rotating device also includes a limiting device, which is used to limit the rotation of the baffle rod when the baffle rod is not extended. The limiting device includes a ring and a polygonal protrusion. The protrusion is integrated into the middle section of the baffle rod, and the ring fixed on the left side wall of the partition in the cavity is nested and fits in the outer surface of the protrusion.

[0012] Preferably, the leakage device is an annular groove formed on the baffle rod, and after the baffle rod moves, water flows out through the gap between the groove and the spray hole.

[0013] Preferably, the leakage device includes a water inlet opened on the surface of the baffle rod and a first water chamber connected to the inside of the baffle rod. The first water chamber is connected to the second water chamber inside the diverter rod through a through hole at the bottom end of the diverter rod, and through holes are opened on both sides of the left and right sides of the top end of the diverter rod.

[0014] Compared with the prior art, the invention has the following beneficial effects: the cooling structure of the die-casting mold is re-arranged to effectively cool down the heat-absorbing medium by using the heat exchange medium, and the movement of the guide rod during the mold closing and demolding process is used to realize the circulation and cooling of the heat exchange medium, and after demolding, the surface of the material can be effectively sprayed and cooled, and the surface of the cavity can be effectively cooled and cleaned at the same time, the structural design is reasonable, and it is more energy-saving and environmentally friendly; 1. The structural design of the horizontal cylinder and the elastic bag can utilize the elastic deformation of the elastic bag to produce a buffering effect, making the movement of the guide rod more stable. At the same time, it can also utilize the movement of the guide rod and the valve plate to produce negative pressure and positive pressure transmission effects, so that the heat exchange medium can be effectively cooled by transferring to the low temperature area; 2. The use of the guide rod can be driven by the driving device to move and extend after demoulding, and the leakage mechanism can be used to spray the coolant to achieve multi-faceted cooling of the material, avoiding the problem of low cooling efficiency caused by the single spraying surface of the clamp in the prior art; Furthermore, the structural design of the impeller and the diverter rod can utilize the extension of the diverter rod to allow the coolant flowing out of the leakage device to be sprayed on the surface of the material and the surface of the cavity at the same time, thereby realizing multi-faceted automatic cleaning and cooling without the need for manual operations. The setting of the slope structure on the right end face of the diverter rod can ensure that the diverter rod can be normally retracted into the baffle rod after the baffle rod is moved back. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the first embodiment of the present invention; Figure 2 It is a schematic diagram of the elastic bag structure of the present invention; Figure 3 It is a schematic diagram of the cross-section structure of the horizontal cylinder of the present invention; Figure 4 It is a schematic diagram of the fixed mold cross-sectional structure of the second embodiment of the present invention; Figure 5 It is a rear view structural schematic diagram after the barrier lever of the present invention moves; Figure 6 It is a schematic diagram of the structure of the diverter rod of the present invention before and after movement; Figure 7 This is a schematic diagram of the impeller structure of the present invention; Figure 8Schematic diagram of the cross-sectional structure of the baffle rod according to the third embodiment of the present invention.

[0016] In the figure: 1. fixed mold; 2. cavity; 3. guide rod; 4. water pipe; 5. horizontal cylinder; 6. connecting pipe; 7. elastic bag; 8. base; 9. valve plate; 10. stop rod; 11. connecting ring; 12. vertical plate; 13. cam; 14. spray hole; 15. slot; 16. protrusion; 17. collar; 18. diverter rod; 19. vertical spring; 20. water box; 21. impeller; 22. branch pipe; 23. water inlet; 24. first water cavity; 25. through hole; 26. second water cavity. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figure 1-8 , the present invention provides the following technical solutions: Example

[0019] In this embodiment, in order to solve the technical problems existing in the prior art and improve the cooling efficiency, the following technical solutions are disclosed. Figure 1-2 As shown, it includes a fixed mold 1 and a cavity opened inside the fixed mold 1 for accommodating a flowing heat-absorbing medium, the top and bottom of the cavity are respectively connected to two water pipes 4, a cavity 2 is opened on the left end face of the fixed mold 1, and a guide rod 3 slidably connected to the fixed mold 1 is arranged on the side of the cavity 2, and the guide rod 3 is fixed on the movable mold for guiding the stable movement of the movable mold, and also includes an elastic bag 7 arranged at the center of the cavity and distributed close to the cavity 2, the elastic bag 7 is fixed on the left end face of the base 8, and the base 8 is fixed in the cavity, and the elastic bag 7 is filled with a heat exchange medium, and the heat exchange medium is used to absorb the heat in the flowing heat-absorbing medium, and drives the guide rod 3 to move in the process of closing the movable mold. The rod 3 slides synchronously, and the molten state of the die-casting material enters the cavity 2 through the water hole. During the molding process, the flowing heat-absorbing medium such as water flow is transported by the water pump, flows in the cavity through the water pipe 4, and returns to the water pump conveying mechanism through the top water pipe 4 to complete the cycle of heat absorption. In this process, due to the high temperature of the die-casting material in the molten state, this causes the water flow temperature to be too high, and the heat exchange medium in the elastic bag 7 can absorb the heat in the heat-absorbing medium. In this way, after the heat-absorbing medium flows back to the water pump conveying mechanism, its temperature can be relatively lower, thereby reducing the operating load of the cooling mechanism in the conveying mechanism, and effectively improving the energy-saving and environmental protection effect.

[0020] Since cavity 2 is located at the center of the mold, the water temperature at the center of the cavity is relatively higher, while the temperature at the corners of the mold and the cavity is relatively lower. Therefore, after the material in cavity 2 is formed, the heat exchange medium can be drained to the relatively low temperature corners of the cavity for cooling. Figure 2 and Figure 3 As shown, the heat exchange medium circulates in the low-temperature area inside the elastic bag 7 and the cavity through the flow device. The flow device includes a transverse cylinder 5 and a connecting pipe 6. The tail end of the connecting pipe 6 is connected to the inside of the elastic bag 7, and the top end is connected to the inside of the transverse cylinder 5. The transverse cylinder 5 is fixed at the corner of the left end face of the fixed mold 1, and a valve plate 9 is slidably arranged inside the transverse cylinder 5. The valve plate 9 is fixedly connected to the tail end of the guide rod 3, and the guide rod 3 is slidably installed in the transverse cylinder 5. When the material is formed, the movable mold drives the guide rod 3 to move in the direction away from the cavity 2. At this time, the valve plate 9 moves with the guide rod 3, so Figure 3 The space on the right side of the middle valve plate 9 will be in a negative pressure state, and the heat exchange medium in the elastic bag 7 will enter the interior of each horizontal cylinder 5 through the connection of the connecting pipe 6, thereby realizing the operation of draining and cooling the heat exchange medium. After the mold is closed, the valve plate 9 will squeeze the corresponding heat exchange medium into the interior of the elastic bag 7 through the connecting pipe 6, realizing a new round of cooling effect on the heat absorbing medium. Example

[0021] In the prior art, after the die-casting mold is cooled from a molten state to a solid state, it still has a relatively high temperature. In the subsequent transfer and other operations, the excessively high temperature can easily cause damage to the staff and mechanical devices. Therefore, in the prior art, a clamping mechanism is used to clamp and separate the material from the cavity 2, and then the clamped side of the material is subjected to water cooling. However, in the case of thick materials, although one side can be cooled by contact with the water flow, the cooling effect of the other side that is not in contact with the water flow is not obvious. Therefore, in order to solve this problem, the following solution is also disclosed in this embodiment, specifically as follows: Figure 4 and Figure 5As shown, a horizontally penetrating spray hole 14 is provided on the mold cavity 2, and a baffle rod 10 whose end portion matches the inner diameter thereof is slidably provided in the spray hole 14, and the baffle rod 10 is installed on the left side wall of the vertical plate 12, and the vertical plate 12 is connected to a driving device, and the driving device is used to drive the baffle rod 10 to slide left and right inside the spray hole 14 through the vertical plate 12, and a leakage mechanism is provided on the baffle rod 10, and the leakage mechanism is used to spray the heat-absorbing medium from the leakage mechanism after the end of the baffle rod 10 extends out of the spray hole 14, and the driving device is composed of a cam 13 and a motor shaft directly connected thereto, and the outer surface of the horizontally distributed cam 13 is attached to the left side surface of the top of the vertical plate 12, and the cam 13 is connected to the bottom end of the motor shaft, and the top end of the motor shaft is connected to the motor through the top wall of the fixed mold 1, and the vertical plate 12 is connected to the motor through the vertical plate 12. It is connected to the inside of the cavity through a horizontal elastic sliding connection of a spring. After the material is formed, the clamping jaws clamp and fix the material from the exposed side of the material and separate it. The water spraying mechanism in the clamping jaws will cool down one side of the material. At the same time, the cam 13 can be driven to rotate through the operation of the motor, and the vertical plate 12 can be driven to move horizontally accordingly. The vertical plate 12 is used to synchronously extend several baffle bars 10 from the spray hole 14. At this time, the heat absorbing medium in the cavity will be blown out through the leakage mechanism accordingly, and sprayed toward the surface of the material not contacted by the clamping jaws, so as to fully cool the formed material. In this way, not only can the material be cooled, but also the heat exchange medium can be efficiently cooled through the continuous flow of the subsequent heat absorbing medium and the contact with the heat exchange medium at the edge.

[0022] Not only does the material itself need to be cooled after demolding, but the surface of the cavity 2 in the mold also needs to be rinsed. In the prior art, it is necessary to rinse it manually or use an additional cleaning mechanism after demolding. The actual operation process is dangerous and inefficient. Therefore, in order to solve this problem, the following solution is also disclosed in this embodiment, such as Figure 5 and Figure 6As shown, a diverter rod 18 is also provided at the end of the baffle rod 10, and the diverter rod 18 is slidably connected to the inside of the baffle rod 10 through a vertical spring 19, and the top right side of the diverter rod 18 is a curved surface structure. When the end of the baffle rod 10 is located inside the spray hole 14, the diverter rod 18 is retracted inside the end of the baffle rod 10, and the tail end of the baffle rod 10 is also connected to a rotating device, and the rotating device is used to drive the baffle rod 10 to rotate after the baffle rod 10 extends out of the spray hole 14, and the middle section of the baffle rod 10 is horizontally slidably connected to the connecting ring 11, and the connecting ring 11 is rotatably mounted on the partition inside the cavity, and the rotating device includes a fixed The water box 20 is fixed on the vertical plate 12, and the impeller 21 is arranged inside the water box 20 and fixed on the right end of the baffle rod 10. The water box 20 is connected with the branch pipe 22. The two ends of the branch pipe 22 are respectively connected with the input port and the output port of the water pump assembly. The water flows in the water box 20 and drives the baffle rod 10 to rotate through the impeller 21. After the baffle rod 10 moves, under the rebound action of the vertical spring 19, the diverter rod 18 will protrude upward. Under its influence, the sprayed water will not only be directly sprayed on the surface of the molded material, but will also be sprayed on the surface of the cavity 2 accordingly, achieving a double cooling and cleaning effect.

[0023] In order to prevent the baffle rod 10 from rotating during the molding process, which may cause the surface of the molding material to become uneven due to contact with the baffle rod 10, the present embodiment further discloses the following solution: Figure 5 As shown, the rotating device also includes a limiting device, which is used to limit the rotation of the blocking rod 10 when the blocking rod 10 is not extended. The limiting device includes a ring 17 and a polygonal protrusion 16. The protrusion 16 is integrated in the middle section of the blocking rod 10, and the ring 17 fixed to the left side wall of the partition in the cavity is nested and fits on the outer surface of the protrusion 16. When the blocking rod 10 is not displaced, the inner wall of the ring 17 fits on the outer wall of the protrusion 16 of the polygonal structure, which effectively limits the self-rotation of the blocking rod 10. When the blocking rod 10 moves, the ring 17 is separated from the protrusion 16, so the blocking rod 10 itself can also rotate normally.

[0024] The following scheme is disclosed in the embodiments, specifically as Figure 5-6 As shown, the leakage device is an annular groove 15 opened on the baffle rod 10. After the baffle rod 10 moves, the water flows out through the gap between the groove 15 and the spray hole 14. When the baffle rod 10 moves, the groove 15 will also move to the spray hole 14. Therefore, the water in the cavity will be sprayed out through the gap between the two. Part of the water flow will directly act on the surface of the material, while the other part of the water flow will be sprayed on the surface of the cavity 2 under the rebound and splashing of the diverter rod 18. The advantage of this is that after the atomized water flow is sprayed on the surface of the material and the cavity 2, it has a higher heat absorption efficiency, and the cooling and cleaning effects are better. Example

[0025] Compared with the above embodiment, this embodiment discloses a different technical solution, which is mainly aimed at the leakage device. In the second embodiment, the use of the leakage device has certain requirements on water pressure, and in this solution, the specific requirements are as follows: Figure 8 As shown, the leakage device includes a water inlet 23 opened on the surface of the baffle rod 10 and a first water chamber 24 connected to the baffle rod 10. The first water chamber 24 is connected to the second water chamber 26 inside the baffle rod 18 through a through hole 25 at the bottom end of the diverter rod 18, and through holes 25 are opened on the left and right sides of the top end of the diverter rod 18. When the diverter rod 18 is extended, water flows into the first water chamber 24 through the water inlet 23, and enters the second water chamber 26 through the through hole 25 at the bottom, and is sprayed toward the material surface and the inner wall of the cavity 2 through the through hole 25 at the top, which can achieve the same cooling and cleaning effects, and has lower requirements for water pressure. In addition, with the rotation of the baffle rod 10, it can expand the spraying range and improve the cooling and cleaning effects.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cooling structure for a die-casting mold, comprising a fixed mold (1) and a cavity provided inside the fixed mold (1) for accommodating a flowing heat-absorbing medium, wherein the top and bottom ends of the cavity are respectively connected to two water pipes (4), a mold cavity (2) is provided on the left end surface of the fixed mold (1), and a guide rod (3) slidably connected to the fixed mold (1) is provided on the side of the mold cavity (2), the guide rod (3) being fixed to the movable mold for guiding the stable movement of the movable mold, characterized in that: It also includes an elastic bag (7) arranged at the center of the cavity and distributed close to the cavity (2), the elastic bag (7) is fixed to the left end surface of the base (8), and the base (8) is fixed in the cavity, and the elastic bag (7) is filled with a heat exchange medium, and the heat exchange medium is used to absorb heat in the flowing heat absorbing medium.

2. The cooling structure of a die-casting mold according to claim 1, characterized in that: The heat exchange medium circulates through the flow device, in the elastic bag (7) and in the low-temperature area inside the cavity.

3. The cooling structure of a die-casting mold according to claim 2, characterized in that: The flow device comprises a transverse cylinder (5) and a connecting tube (6), the rear end of the connecting tube (6) being connected to the interior of the elastic bag (7), and the top end being connected to the interior of the transverse cylinder (5), the transverse cylinder (5) being fixed at the corner of the left end face of the fixed mold (1), and a valve plate (9) being slidably arranged inside the transverse cylinder (5), the valve plate (9) being fixedly connected to the rear end of the guide rod (3), and the guide rod (3) being slidably installed in the transverse cylinder (5).

4. The cooling structure of a die-casting mold according to claim 3, characterized in that: The mold cavity (2) is provided with a spray hole (14) extending horizontally therethrough. A baffle rod (10) whose end matches the inner diameter of the spray hole (14) is slidably arranged in the spray hole (14). The baffle rod (10) is mounted on the left side wall of the vertical plate (12). The vertical plate (12) is connected to a driving device. The driving device is used to drive the baffle rod (10) to slide left and right inside the spray hole (14) through the vertical plate (12). The baffle rod (10) is provided with a leakage mechanism. The leakage mechanism is used to spray a heat absorbing medium out of the leakage mechanism after the end of the baffle rod (10) extends out of the spray hole (14).

5. The cooling structure of a die-casting mold according to claim 4, characterized in that: The driving device is composed of a cam (13) and a motor shaft directly connected thereto. The outer surface of the horizontally distributed cam (13) is attached to the left side surface of the top of the vertical plate (12). The cam (13) is connected to the bottom end of the motor shaft. The top end of the motor shaft passes through the top wall of the fixed mold (1) and is connected to the motor. The vertical plate (12) is horizontally elastically slidably connected to the inside of the cavity via a spring.

6. The cooling structure of a die-casting mold according to claim 5, characterized in that: A diverter rod (18) is also provided at the end of the baffle rod (10). The diverter rod (18) is slidably connected to the inside of the baffle rod (10) via a vertical spring (19). The top right side of the diverter rod (18) is a curved surface structure. When the end of the baffle rod (10) is located inside the spray hole (14), the diverter rod (18) is retracted inside the end of the baffle rod (10). The tail end of the baffle rod (10) is also connected to a rotating device. The rotating device is used to drive the baffle rod (10) to rotate after the baffle rod (10) extends out of the spray hole (14). The middle section of the baffle rod (10) is horizontally slidably connected to the connecting ring (11), and the connecting ring (11) is rotatably mounted on the partition inside the cavity.

7. A cooling structure for a die-casting mold according to claim 6, characterized in that: The rotating device comprises a water box (20) fixed on the vertical plate (12), and an impeller (21) arranged inside the water box (20) and fixed to the right end of the blocking rod (10). The water box (20) is connected to a branch pipe (22), and the two ends of the branch pipe (22) are respectively connected to the input port and the output port of the water pump assembly. Water flows in the water box (20) and drives the blocking rod (10) to rotate through the impeller 21.

8. The cooling structure of a die-casting mold according to claim 7, characterized in that: The rotating device also includes a limiting device, which is used to limit the rotation of the blocking rod (10) when the blocking rod (10) is not extended. The limiting device includes a collar (17) and a polygonal protrusion (16). The protrusion (16) is integrally arranged in the middle section of the blocking rod (10), and the collar (17) fixed to the left side wall of the partition in the cavity is nested and fits in the outer surface of the protrusion (16).

9. The cooling structure of a die-casting mold according to claim 8, characterized in that: The leakage device is an annular groove (15) formed on the baffle rod (10); after the baffle rod (10) moves, water flows out through the gap between the groove (15) and the spray hole (14).

10. The cooling structure of a die-casting mold according to claim 8, characterized in that: The leakage device comprises a water inlet (23) formed on the surface of the barrier rod (10) and a first water chamber (24) connected to the barrier rod (10). The first water chamber (24) is connected to a second water chamber (26) inside the diverter rod (18) through a through hole (25) at the bottom end of the diverter rod (18). Furthermore, through holes (25) are formed on both left and right sides of the top end of the diverter rod (18).

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