A ductile iron manhole cover casting production line

Abstract

The present invention discloses a casting and forming assembly line for ductile iron manhole covers, and specifically relates to the technical field of manhole cover casting and forming, including two conveying lines for transmitting molds, a bracket one, two friction gear rings fixed to the upper end of the bracket one, a support ring, an upper mold and a lower mold, and a flipping assembly for flipping the upper mold and the lower mold is symmetrically arranged between the two support rings, and a construction opening assembly is arranged at one end of the two support rings close to each other. The casting and forming assembly line for ductile iron manhole covers described in the present invention adopts the design of a construction opening assembly, so that the device can scrape out a pouring port on part of the clay sand of the upper mold, and adopts the design of a flipping assembly, so that the device can automatically complete the mold closing after the pouring port is opened, which facilitates the operation of the device and improves the working efficiency of the device. The design of a guide groove is adopted, so that the scraped powder will fall out along the guide groove, making the device more stable when in use.

Description

Technical Field

[0001] The invention relates to the technical field of manhole cover casting and forming, and in particular to a ductile iron manhole cover casting and forming production line. Background Art

[0002] Ductile iron manhole cover is a manhole cover made of ductile iron material, which has many advantages. For example: high strength and durability, good anti-slip performance, excellent anti-theft performance, good anti-noise performance, good corrosion resistance, easy installation and maintenance.

[0003] The invention application with publication number CN118371665A discloses a casting mold for producing ductile iron manhole covers, which is mainly composed of an upper mold assembly, a lower mold assembly and a cooling assembly. The components work together to meet the casting requirements of ductile iron manhole covers with threads on the outer periphery and the requirements of rapid cooling and demolding. During casting, the upper module of the upper mold assembly and the lower module of the lower mold assembly are molded together, and pouring is carried out using the runner reserved on the upper module. After pouring, the cooling assembly is used for rapid cooling, and then the upper module of the upper mold assembly is separated from the lower module. The rotary demolding mechanism of the lower module is used to allow the cast ductile iron manhole cover to be ejected upward while rotating, and finally rapid demolding is completed.

[0004] However, in actual use, the device requires an operator to open a pouring port separately. In addition, the device cannot automatically close the mold, and the operator is required to control the mold closing separately, which is inconvenient to operate and the working efficiency of the device is relatively low. Summary of the invention

[0005] The main purpose of the present invention is to provide a ductile iron manhole cover casting production line, which can effectively solve the problems of inconvenient operation and relatively low working efficiency.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A ductile iron manhole cover casting production line, comprising: two conveyor lines for conveying molds;

[0008] Bracket 1;

[0009] Two friction gear rings fixed to an upper end of the bracket;

[0010] Support ring;

[0011] The upper mold and the lower mold are symmetrically provided with a flipping assembly for flipping the upper mold and the lower mold between the two support rings, and the ends of the two support rings close to each other are both provided with a construction opening assembly.

[0012] In this embodiment, a plurality of guide rods are fixed to the upper end of the upper mold, and a plurality of through holes matching the guide rods are opened at the upper end of the lower mold;

[0013] The upper parts of the outer surfaces of the plurality of guide rods are in a truncated cone shape;

[0014] The flip assembly comprises a support frame fixed between the two support rings, and rollers 1 for supporting the mold are rotatably installed at the ends of the two support frames close to each other, and vertical grooves 1 are provided on the left and right inner walls of the support frame, and vertical grooves 2 are also provided on the inner wall of the vertical grooves 1, and arc grooves are also provided on the side walls of the vertical grooves 2, and a clamping assembly is also provided inside the support frame;

[0015] The clamping assembly includes mounting plates arranged in the supporting frame at the front and rear ends, a sliding rod 2 adapted to match the vertical groove 1 and a sliding rod 1 adapted to match the vertical groove 2 are fixed to both left and right ends of the mounting plates, roller 2 are rotatably mounted on the ends of the two mounting plates close to each other, a connecting rope is fixed to the end of the upper end of the mounting plate away from roller 2, the other end of the connecting rope is fixedly connected to the side of the lower end of the mounting plate close to roller 2, a plurality of pulley groups for guiding the connecting ropes are also provided in the inner cavity of the supporting frame, and a locking motor for driving the pulley group is also fixed in the inner cavity of the supporting frame.

[0016] In this embodiment, the opening assembly includes a bracket 2 fixedly connected to the support ring, a mounting tube is fixed to the upper end of the bracket 2, a scraper assembly is arranged on the inner surface of the mounting tube, a nut is rotatably mounted on the upper end of the mounting tube, a dual-axis motor is fixed to the upper end of the bracket 2, one output end of the dual-axis motor is connected to the nut through a bevel gear set, and the other output end of the dual-axis motor is fixed to a friction wheel matching the friction gear ring.

[0017] In this embodiment, the scraper assembly includes a screw rod threadedly connected to the mounting pipe, a plurality of guide grooves are provided on the upper outer surface of the screw rod, a plurality of triangular scraper blades 1 are fixed to the outer surface of the screw rod, and a plurality of triangular scraper blades 2 are fixed to the upper end of the screw rod.

[0018] In this embodiment, the screw rod is also threadedly connected to the nut.

[0019] In this embodiment, the roller one and the roller two have the same shape and size as the rollers of the conveyor line. When the support frame is in a normal state, the roller one located below is in the same horizontal plane as the roller below the conveyor line. After the support frame is flipped 180°, the roller one located below is still in the same horizontal plane as the roller below the conveyor line.

[0020] In this embodiment, when the sliding rod 1 slides in the vertical groove 2, the mounting plate is vertically arranged, and when the sliding rod 1 slides in the arc groove, the mounting plate is inclined.

[0021] In this embodiment, the cross-sectional area of ​​the vertical groove 1 and the sliding rod 2 is larger than the cross-sectional area of ​​the vertical groove 2, the arc groove, and the sliding rod 1, and the sliding rod 2 is shorter than the sliding rod 1.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The present invention adopts the design of a pouring port assembly, and through the mutual cooperation between the screw, the mounting pipe and the nut, the device can scrape out a pouring port on part of the clay sand of the upper mold, and chamfer the upper part of the pouring port through a pair of triangular scrapers. There is no need for an operator to open a pouring port separately, which facilitates the operation of the device and can also improve the working efficiency of the device.

[0024] The present invention adopts the design of the guide groove, so that the scraped powder will fall out along the guide groove until the pouring port is opened into the forming cavity, and a pouring port will not be directly poked out by a screw, thereby preventing an extra gap at the pouring port from affecting the normal pouring of the device, making the device more stable when in use.

[0025] The present invention adopts the design of a flipping component, and through the mutual cooperation between multiple rollers, the device can normally transmit the upper mold, and utilizes the design of the clamping component so that the support ring can still clamp the upper mold when flipping, and then through the mutual cooperation between the clamping component and the vertical groove one, the vertical groove two, and the arc groove, the mounting plate can be rotated, so that the horizontal position of roller two moves downward until it is separated from the upper mold and the upper mold and the lower mold are completed. The device can automatically complete the mold closing after the casting port is opened, which facilitates the operation of the device and improves the working efficiency of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 It is a schematic diagram of the structure of the bracket 1 and the friction gear ring of the present invention;

[0028] Figure 3 It is a structural schematic diagram of the opening assembly of the present invention;

[0029] Figure 4 It is a structural schematic diagram of the scraper assembly of the present invention;

[0030] Figure 5 It is a schematic structural diagram of the scraper assembly of the present invention cooperating with the upper mold;

[0031] Figure 6 It is a schematic diagram of the structure of the flip assembly of the present invention;

[0032] Figure 7 It is a left side view of the flip assembly of the present invention;

[0033] Figure 8 It is a left view of the flip assembly of the present invention when transferring to the upper mold;

[0034] Fig. 9 It is a left side view of the flip assembly of the present invention when the mold is closed.

[0035] In the figure: 1. conveyor line; 2. bracket 1; 3. friction gear ring; 4. support ring; 5. upper mold; 6. lower mold; 7. flip assembly; 71. support frame; 72. roller 1; 73. vertical slot 1; 74. vertical slot 2; 75. arc slot; 76. clamping assembly; 761. mounting plate; 762. sliding rod 1; 763. sliding rod 2; 764. roller 2; 765. connecting rope; 8. opening assembly; 81. bracket 2; 82. mounting pipe; 83. scraper assembly; 831. screw; 832. guide slot; 833. triangular scraper 1; 834. triangular scraper 2; 84. nut; 85. dual-axis motor; 86. bevel gear set; 87. friction wheel. DETAILED DESCRIPTION

[0036] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0037] Embodiment 1

[0038] like Figure 1 As shown, a ductile iron manhole cover casting molding assembly line includes two conveyor lines 1 for transmitting molds. The conveyor line 1 clamps and transmits the mold when transmitting the mold, instead of using a conveyor belt to transmit the mold, so that the device can transmit the mold more accurately, which is convenient for mold closing and casting. A bracket 2 is located between the two conveyor lines 1. The bracket 2 is used for installing a flip assembly 7 and a building opening assembly 8. Two friction gear rings 3 are fixed to the upper end of the bracket 2, and a support ring 4 is rotatably installed on a side of the two friction gear rings 3 that is close to each other. An upper mold 5 and a lower mold 6 are symmetrically arranged between the two support rings 4. Since the molding cavities of the upper mold 5 and the lower mold 6 are located at the upper part when the conveyor line 1 transmits the mold, the device needs to flip the upper mold 5 when in use, so as to facilitate the mold closing of the upper mold 5 and the lower mold 6. The ends of the two support rings 4 that are close to each other are both provided with building opening assemblies 8.

[0039] like Figure 1 and Fig. 9 As shown, a plurality of guide rods are fixed to the upper end of the upper mold 5, a plurality of through holes compatible with the guide rods are opened at the upper end of the lower mold 6, and the upper part of the outer surface of the plurality of guide rods is truncated cone-shaped, which can facilitate the guide rods to be inserted into the through holes, thereby completing the mold closing of the upper mold 5 and the lower mold 6 (since the device may produce positional displacement when transmitting the mold, it is necessary to guide it so that the mold can be accurately closed). The upper mold 5 and the lower mold 6 are both prior art, and their main body is a frame filled with clay sand for foundry. Sand foundry molding is prior art, and the mold used therein is also prior art, which will not be elaborated in detail in the present invention.

[0040] like Figure 3 As shown, the opening assembly 8 includes a bracket 2 81 fixedly connected to the support ring 4, so that when the support ring 4 rotates relative to the friction gear ring 3, the bracket 2 81 will also rotate relative to the friction gear ring 3, a mounting tube 82 is fixed to the upper end of the bracket 2 81, a scraper assembly 83 is arranged on the inner surface of the mounting tube 82, a nut 84 is rotatably mounted on the upper end of the mounting tube 82, a dual-axis motor 85 is fixed to the upper end of the bracket 2 81, one output end of the dual-axis motor 85 is connected to the nut 84 through a bevel gear set 86, so that when the output end of the dual-axis motor 85 rotates, the nut 84 can be driven to rotate, and a friction wheel 87 matched with the friction gear ring 3 is fixed to the other output end of the dual-axis motor 85. Since the friction gear ring 3 is fixed to the upper end of the bracket 1 2, the friction wheel 87 can make the bracket 2 81 rotate relative to the friction gear ring 3 when it rotates, thereby making the two support rings 4 rotate relative to the friction gear ring 3.

[0041] like Figure 4 and Figure 5 As shown, the scraper assembly 83 includes a screw 831 threadedly connected to the mounting tube 82, and the screw 831 is also threadedly connected to the nut 84, wherein, in order to prevent the nut 84 from driving the screw 831 to rotate idly when rotating, the mounting tube 82 limits the screw 831 so that the screw 831 can move upward or downward when the nut 84 rotates, and due to the design of the screw 831 being threadedly connected to the mounting tube 82, the screw 831 can also rotate when moving upward or downward, and a plurality of holes are provided on the upper portion of the outer surface of the screw 831. A guide groove 832 is formed, and a plurality of triangular scrapers 833 are fixed on the outer surface of the screw 831. A plurality of triangular scrapers 834 are fixed on the upper end of the screw 831. When the screw 831 rotates and moves upward, the triangular scraper 834 first scrapes a casting port on the top surface of the upper mold 5. Due to the setting of the guide groove 832, the scraped powder will fall out along the guide groove 832 until the casting port is opened into the forming cavity. At this time, the plurality of triangular scrapers 833 chamfer the upper part of the casting port to facilitate the casting of the manhole cover.

[0042] Among them, if the threaded connection adopts a groove and protrusion design, a larger friction force will be generated at the groove and the protrusion, which will cause the screw 831 to get stuck easily when rotating and moving upward. In order to make the component smoother during use, multiple balls can be set at the protrusion of the thread to reduce friction (similar to the principle of a ball screw).

[0043] The specific implementation of this embodiment is as follows: when the device is used, clay sand required for use is first added into the upper mold 5 and the lower mold 6, and then a forming cavity is formed between the upper mold 5 and the lower mold 6 by using the mold, and then the upper mold 5 and the lower mold 6 are placed on the conveyor line 1, and the conveyor line 1 is used to transport the upper mold 5 and the lower mold 6, and when placing the molds, the upper mold 5 is placed in front of the lower mold 6;

[0044] When the device is transferring the mold, the upper mold 5 is first transferred to the top of the two opening components 8, and then the upper mold 5 is flipped through the cooperation between the support ring 4 and the flip component 7. When flipping, the output shaft of the double-axis motor 85 rotates, and then drives the friction wheel 87 to rotate, and then the friction wheel 87 and the friction gear ring 3 are rubbed against each other, and the friction gear ring 3 is fixed to the ground relative to the support ring 4 so that the support ring 4 can rotate, and when the support ring 4 rotates, the upper mold 5 can be flipped;

[0045] When the output end of the dual-axis motor 85 rotates, the nut 84 is driven to rotate through the bevel gear set 86. At this time, through the threaded connection between the nut 84 and the screw 831, the screw 831 rotates and moves upward at the same time, so that the triangular scraper 834 partially scrapes off the clay sand of the upper mold 5, thereby scraping out a pouring port. Due to the setting of the guide groove 832, the scraped powder will fall out along the guide groove 832 until the pouring port is opened into the forming cavity. At this time, multiple triangular scrapers 833 chamfer the upper part of the pouring port to facilitate the casting of the manhole cover, and then the upper mold 5 and the lower mold 6 are completed by the flip assembly 7. After the mold is closed, the dual-axis motor 85 rotates in the opposite direction, so that the support ring 4 returns to its original position, thereby facilitating the next use of the device. Embodiment 2

[0046] This embodiment further improves the flip assembly 7 on the basis of the first embodiment, so that the device can flip the upper mold 5 when in use, which facilitates the mold closing.

[0047] like Figure 6As shown, the flip assembly 7 includes a support frame 71 fixed between two support rings 4, so that the two support rings 4 can drive the support frame 71 to flip, thereby facilitating the closing of the upper mold 5 and the lower mold 6. The two support frames 71 are rotatably installed at one end close to each other with a roller 72 for supporting the mold, so that the mold transmitted by the conveyor line 1 can be transmitted to the top of the roller 72 located below, thereby facilitating the roller 72 to continue to transmit the mold.

[0048] In addition, roller 1 72 and roller 2 764 have the same shape and size as the rollers of the conveyor line 1. When the support frame 71 is in a normal state, the roller 1 72 located below is in the same horizontal plane as the rollers below the conveyor line 1. After the support frame 71 flips 180°, the roller 1 72 located below is still in the same horizontal plane as the rollers below the conveyor line 1, so that the conveyor line 1 first transfers the upper mold 5 to the roller 1 72 located below. Since the roller 1 72 is rotatably connected to the support frame 71, it is convenient for the device to transfer the mold, such as Figure 7 As shown, the left and right inner walls of the support frame 71 are both provided with a vertical groove 1 73, the inner wall of the vertical groove 1 73 is also provided with a vertical groove 2 74, the side wall of the vertical groove 2 74 is also provided with an arc groove 75, and a clamping assembly 76 for clamping the upper mold 5 is also provided inside the support frame 71.

[0049] like Figure 6 and Figure 7 As shown, the clamping assembly 76 includes a mounting plate 761 arranged in the front and rear of the supporting frame 71, and a sliding rod 763 adapted to the vertical groove 1 73 and a sliding rod 1 762 adapted to the vertical groove 2 74 are fixed at both ends of the left and right sides of the mounting plate 761, wherein the sliding rod 1 762 can slide in the vertical groove 2 74 and the arc groove 75, and the sliding rod 2 763 slides in the vertical groove 1 73. When the sliding rod 1 762 slides in the vertical groove 2 74, the mounting plate 761 is vertically arranged, so that the roller 2 764 can support the upper mold 5 and cannot allow the upper mold 5 to be molded with the lower mold 6. When the sliding rod 1 762 slides in the arc groove 75, the mounting plate 761 is tilted, so that the mounting plate 761 rotates with the sliding rod 2 763 as the central axis. At the same time, since the roller 2 764 supports the upper mold 5, the upper mold 5 will move downward, thereby allowing the upper mold 5 to be molded with the lower mold 6.

[0050] In addition, if Figure 7As shown, the cross-sectional area of ​​the vertical groove 1 73 and the sliding rod 2 763 is larger than the cross-sectional area of ​​the vertical groove 2 74, the arc groove 75, and the sliding rod 1 762, and the sliding rod 2 763 is shorter than the sliding rod 1 762, so that the sliding rod 2 763 cannot be completely located in the vertical groove 2 74, the sliding rod 1 762 cannot be completely located in the vertical groove 1 73, and the sliding rod 2 763 can always be located in the vertical groove 1 73, so that the sliding rod 2 763 can only move up and down in the vertical groove 1 73, and due to the design of the arc groove 75 The design makes it possible for the second sliding rod 763 to be located at the bottom of the vertical groove 1 73, and the mounting plate 761 can rotate with the second sliding rod 763 as the central axis, thereby rotating from a vertical state to a horizontal state. When the mounting plate 761 rotates, since the second roller 764 supports the upper mold 5, the second roller 764 slowly stops contacting the upper mold 5, making it convenient for the second roller 764 to not limit the upper mold 5, and the upper mold 5 can fall to the top of the lower mold 6 and contact the lower mold 6, thereby facilitating the mold closing.

[0051] In addition, roller 2 764 is rotatably installed at one end of the two mounting plates 761 that are close to each other, and a connecting rope 765 is fixed to the end of the upper end of the mounting plate 761 away from roller 2 764, and the other end of the connecting rope 765 is fixedly connected to the side of the lower end of the mounting plate 761 close to roller 2 764. The inner cavity of the support frame 71 is also provided with a plurality of pulley groups for guiding the connecting rope 765, and the inner cavity of the support frame 71 is also fixed with a locking motor for driving the pulley group. The locking motor is a prior art. Due to the design that the output end of the locking motor is connected to the pulley group, the connecting rope 765 can be transmitted when the output end of the locking motor rotates, and then the mounting plate 761 can be moved up or down, and due to the design that the output end of the locking motor can be locked, the mounting plate 761 can be located at the top, so that roller 2 764 supports the upper mold 5.

[0052] like Figure 8 As shown, when the support frame 71 is not turned over, the mounting plate 761 is located at the bottom of the support frame 71 ( Figure 8 As shown below), the roller 2 764 cooperates with the roller 1 72 below to clamp the upper mold 5 being transported. When the support frame 71 is turned over, the roller 2 764 and the roller 1 72 below still clamp the upper mold 5 to prevent the upper mold 5 from falling when the support ring 4 is turned over, thereby affecting the normal operation of the device;

[0053] like Fig. 9 As shown, after the support frame 71 is turned over, the locking motor is started, and then the mounting plate 761 is moved downward by cooperating with the connecting rope 765 and the pulley assembly ( Fig. 9As shown in the figure), when the sliding rod 2 763 moves to the bottom and the locking motor continues to rotate, the mounting plate 761 can rotate with the sliding rod 2 763 as the axis (at this time, the sliding rod 1 762 moves from the vertical groove 2 74 to the arc groove 75). When the mounting plate 761 rotates, the roller 2 764 supports the upper mold 5, so that the roller 2 764 slowly stops contacting the upper mold 5, making it convenient for the roller 2 764 not to limit the upper mold 5, and the upper mold 5 can fall to the top of the lower mold 6 and contact the lower mold 6, thereby completing the mold closing.

[0054] The specific implementation of this embodiment is as follows: when the device is in use, the pouring port assembly 8 first hangs out the pouring port of the mold, and at the same time the support ring 4 rotates 180 degrees, so that the forming cavities of the upper mold 5 and the lower mold 6 are located on the side close to each other;

[0055] Then the locking motor is started, and the locking motor drives the pulley group to rotate, so that the mounting plate 761 moves downward first. At this time, the sliding rod 1 762 is located in the vertical groove 2 74. When the sliding rod 2 763 is located at the bottom of the vertical groove 1 73, the locking motor continues to rotate. Due to the design of the installation position of the connecting rope 765, the connecting rope 765 can pull the lower right side of the mounting plate 761, so that the mounting plate 761 can rotate clockwise (such as Fig. 9 As shown), at the same time, due to the design of the roller 2 764 supporting the upper mold 5, the upper mold 5 can move downward, thereby automatically closing the mold, which facilitates the operation of the device.

[0056] It should be noted that the specific installation methods, circuit connection methods and control methods of the conveyor line 1, mold, dual-axis motor 85 and locking motor in the present invention are all conventional designs and will not be elaborated in detail in the present invention.

[0057] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A ductile iron manhole cover casting production line, comprising: Two conveyor lines (1) for transferring molds; Bracket 1 (2); Two friction gear rings (3) fixed to the upper end of the first bracket (2); Support ring (4); The upper mold (5) and the lower mold (6) are characterized in that: a flip assembly (7) for flipping the upper mold (5) and the lower mold (6) is symmetrically arranged between the two support rings (4), and a construction opening assembly (8) is arranged at one end of the two support rings (4) close to each other; The flip assembly (7) comprises a support frame (71) fixed between the two support rings (4); a roller (72) for supporting the mold is rotatably mounted on one end of the two support frames (71) close to each other; a vertical groove (73) is provided on the left and right inner walls of the support frame (71); a vertical groove (74) is provided on the inner wall of the vertical groove (73); an arc groove (75) is provided on the side wall of the vertical groove (74); and a clamping assembly (76) is also provided inside the support frame (71); The clamping assembly (76) comprises a mounting plate (761) arranged front and rear in the support frame (71); a sliding rod (763) adapted to the vertical groove (73) and a sliding rod (762) adapted to the vertical groove (74) are fixed to both left and right ends of the mounting plate (761); roller (764) is rotatably mounted on the ends of the two mounting plates (761) close to each other; a connecting rope (765) is fixed to the end of the upper end of the mounting plate (761) away from roller (764); the other end of the connecting rope (765) is fixedly connected to the side of the lower end of the mounting plate (761) close to roller (764); a plurality of pulley groups for guiding the connecting ropes (765) are also provided in the inner cavity of the support frame (71); and a locking motor for driving the pulley group is also fixed in the inner cavity of the support frame (71).

2. The ductile iron manhole cover casting production line according to claim 1 is characterized in that: A plurality of guide rods are fixed to the upper end of the upper mold (5), and a plurality of through holes matching the guide rods are opened at the upper end of the lower mold (6); The upper portions of the outer surfaces of the plurality of guide rods are in a truncated cone shape.

3. The ductile iron manhole cover casting production line according to claim 1 is characterized in that: The opening assembly (8) comprises a second bracket (81) fixedly connected to the support ring (4); a mounting tube (82) is fixed to the upper end of the second bracket (81); a scraper assembly (83) is arranged on the inner surface of the mounting tube (82); a nut (84) is rotatably mounted on the upper end of the mounting tube (82); a double-axis motor (85) is fixed to the upper end of the second bracket (81); one output end of the double-axis motor (85) is connected to the nut (84) via a bevel gear set (86); and a friction wheel (87) matched with the friction gear ring (3) is fixed to the other output end of the double-axis motor (85).

4. A ductile iron manhole cover casting production line according to claim 3, characterized in that: The scraper assembly (83) comprises a screw rod (831) threadedly connected to the mounting tube (82); a plurality of guide grooves (832) are provided on the upper portion of the outer surface of the screw rod (831); a plurality of triangular scraper plates (833) are fixed to the outer surface of the screw rod (831); and a plurality of triangular scraper plates (834) are fixed to the upper end of the screw rod (831).

5. The ductile iron manhole cover casting production line according to claim 4 is characterized in that: The screw rod (831) is also threadedly connected to the nut (84).

6. A ductile iron manhole cover casting production line according to claim 1, characterized in that: The roller one (72) and the roller two (764) are of the same shape and size as the rollers of the conveyor line (1); when the support frame (71) is in a normal state, the roller one (72) located below is in the same horizontal plane as the rollers below the conveyor line (1); and when the support frame (71) is flipped 180 degrees, the roller one (72) located below is still in the same horizontal plane as the rollers below the conveyor line (1).

7. A ductile iron manhole cover casting production line according to claim 6, characterized in that: When the sliding rod 1 (762) slides in the vertical groove 2 (74), the mounting plate (761) is arranged vertically, and when the sliding rod 1 (762) slides in the arc groove (75), the mounting plate (761) is arranged tilted.

8. The ductile iron manhole cover casting production line according to claim 7, characterized in that: The cross-sectional areas of the vertical groove 1 (73) and the sliding rod 2 (763) are greater than the cross-sectional areas of the vertical groove 2 (74), the arc groove (75) and the sliding rod 1 (762), and the sliding rod 2 (763) is shorter than the sliding rod 1 (762).

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