Modeling device for casting self-cleaning well lid

Abstract

The invention relates to the technical field of well lid casting, in particular to a self-cleaning well lid casting modeling device which comprises a rack and a casting unit, the casting unit comprises a sand blasting box and a mold, the mold is mounted on a mounting frame plate, a built-in cylinder is rotatably mounted on the rack, and two linear sliding rails are arranged on the inner wall of the built-in cylinder; the mounting frame plate is slidably mounted on the linear sliding rail, and a rotation driving unit used for driving the built-in cylinder to rotate along the axis of the built-in cylinder is arranged on the rack; a plurality of air blowing nozzles are mounted on the inner wall of the built-in cylinder, the air blowing nozzles are located on the two sides of the mold respectively, the built-in cylinder is provided with an air inlet channel communicated with the exterior of the built-in cylinder and the air blowing nozzles, and an air supply assembly is arranged on the rack. And then the air supply assembly, the air-blowing spray head and the air inlet channel are used for carrying out air-blowing cleaning on the downwards inclined surface of the mold, so that impurities on the molding surface of the mold are effectively removed.

Description

Technical Field

[0001] The present invention relates to the technical field of manhole cover casting, and more particularly to a molding device for self-cleaning manhole cover casting. Background Art

[0002] A manhole cover is used to cover a road or a deep well at home to prevent people or objects from falling. It can be divided into metal manhole covers, high-strength fiber cement concrete manhole covers, resin manhole covers, etc. according to the material, and is generally circular. It can be used in green belts, sidewalks, motor vehicle lanes, docks, alleys, etc. Before casting a manhole cover, molding sand is needed to make a casting mold. Generally, a vertical molding machine is used in cooperation with a mold to compact and mold the molding sand. An integral casting mold is formed by combining two sets of molding sand molds, the upper and the lower. Molten iron is poured into the molding sand mold, and after cooling, the manhole cover can be obtained. However, after one processing is completed, some impurities may adhere to the forming surface of the mold. In the subsequent processing, the material may not fully fit the forming surface of the mold, thus affecting the forming quality of the subsequent casting mold. Summary of the Invention

[0003] In view of the above problems, it is necessary to provide a molding device for self-cleaning manhole cover casting in view of the problems of the prior art.

[0004] To solve the problems of the prior art, the technical solution adopted by the present invention is as follows: A molding device for self-cleaning manhole cover casting, comprising a frame, and a casting unit arranged on the frame. The casting unit includes a sandblasting box and a mold. The mold is installed on a mounting frame plate. A first linear driver for driving the mounting frame plate and the mold to move horizontally is arranged on the frame. An inner cylinder is rotatably installed on one side of the frame close to the first linear driver of the casting unit. Two linear sliding rails extending along the axial direction are arranged on the inner wall of the inner cylinder, and the linear sliding rails are symmetrically arranged about the axis of the inner cylinder. Support feet are arranged on both sides of the mounting frame plate, and the support feet are slidably installed on the linear sliding rails. A rotary drive unit for driving the inner cylinder to rotate along its own axis is arranged on the frame; a plurality of air blowing nozzles are installed on the inner wall of the inner cylinder, and the air blowing nozzles are respectively located on both sides of the mold. An air inlet channel communicating the outside of the inner cylinder with the air blowing nozzles is arranged on the inner cylinder. The axis of the air inlet channel forms a 45-degree angle with the surface of the mold, and the air inlet channels on both sides are symmetrically arranged about the mounting frame plate. The output end of the air blowing nozzle 23 is hingedly installed with a sand-proof cover. A gas supply assembly is arranged on the frame. When the rotary drive unit drives the inner cylinder to rotate until one of the air inlet channels is in a horizontal state, the gas supply assembly injects gas into the air inlet channel, so that the air blowing nozzles blow and clean the downward-inclined side of the mold; slag discharge ports are arranged on both sides of the linear sliding rail far from the air blowing nozzles in the inner cylinder, and the impurities blown out by the air blowing nozzles are discharged through the slag discharge ports when the rotary drive unit drives the inner cylinder to rotate in the reverse direction.

[0005] Preferably, the air supply assembly includes an air supply tank and an air source. An accommodation hole aligned with the inner cylinder is provided on the air supply tank. The inner cylinder is rotatably installed in the accommodation hole, and the accommodation hole fits the outer wall of the inner cylinder. A main air pipe is provided at the top of the air supply tank. The input end of the main air pipe is connected to the output end of the air source, and the output end of the main air pipe communicates with two branch air pipes. The output end of each branch air pipe is respectively communicated with two air inlet cavities provided on the inner wall of the accommodation hole. When the rotary drive unit drives the inner cylinder to rotate until the air inlet channel is in a horizontal state, the horizontal air inlet channel communicates with the air inlet cavity.

[0006] Preferably, a collection cavity is provided at the bottom of the air supply tank. Two feeding channels vertically extending to communicate with the accommodation hole are provided on the collection cavity. The open ends of the feeding channels are respectively located below the air inlet cavities. An inner concave air channel is provided at one end of the slag discharge port on the outer wall of the inner cylinder. When the rotary drive unit drives the inner cylinder to rotate until one side air inlet channel is in a horizontal state, the inner concave air channel at the slag discharge port on the same side of the mold communicates with the air inlet cavity and the feeding channel away from the air inlet channel on that side.

[0007] Preferably, the air inlet channels are distributed in a matrix along the length and width directions of the mounting frame plate.

[0008] Preferably, a slag blocking plate is provided at the opening of the slag discharge port located inside the inner cylinder. The two slag blocking plates are respectively located on both sides of the linear slide rail away from the air blowing nozzle.

[0009] Preferably, an opening is provided on one side of the collection cavity, and a collection box is slidably installed in the collection cavity.

[0010] Preferably, the inner cylinder is rotatably installed in a plurality of mounting seats provided on the frame. A rotary sleeve is coaxially installed at one end of the inner cylinder. A tooth groove surrounding the outside of the rotary sleeve is provided on the rotary sleeve. The rotary drive unit includes a rotary driver fixedly installed on the frame. The rotary shaft of the rotary driver is parallel to the axis of the inner cylinder. A driving wheel is coaxially installed on the rotary shaft of the rotary driver. The driving wheel is connected to the tooth groove outside the rotary sleeve through a transmission belt. A locking unit for locking the rotation angle of the inner cylinder is provided on the mounting seat.

[0011] Preferably, the locking unit includes a second linear driver fixedly installed on the mounting seat. The working end of the second linear driver moves along the radial direction of the inner cylinder. A positioning rod is installed on the working end of the second linear driver. The positioning rod extends along the radial direction of the inner cylinder. Three positioning strips are provided on the outer wall of the inner cylinder. Positioning jacks extending along the radial direction of the inner cylinder are provided on the positioning strips. When the positioning rod is inserted into the positioning jacks, the rotation angle of the inner cylinder is locked.

[0012] Preferably, the included angle between the axes of two adjacent positioning jacks is forty-five degrees.

[0013] Preferably, the first linear driver is fixedly installed at one end of the built-in cylinder away from the frame. The working end of the first linear driver is on the same straight line as the axis of the built-in cylinder. A limiting sleeve is provided at one end of the mounting plate facing the first linear driver. The axis of the limiting sleeve is on the same straight line as the axis of the built-in cylinder. A rotating seat is coaxially and rotatably installed in the limiting sleeve, and the rotating seat is fixedly connected to the working end of the first linear driver.

[0014] The beneficial effects of the present invention compared with the prior art are as follows: First, the present invention drives the mold to rotate through the built-in cylinder to tilt the mold, and then uses the air supply component, air blowing nozzle and air inlet channel to blow and clean the downward-tilted surface of the mold, effectively removing impurities on the molding surface of the mold, ensuring the cleanliness of the mold, and improving the molding quality of the subsequent casting mold.

[0015] Second, a slag discharge port is provided in the built-in cylinder of the present invention. Under the action of the rotation driving unit, the impurities blown out by the air blowing nozzle can be automatically discharged, eliminating the need for manual cleaning of impurities, improving work efficiency, and reducing errors and safety hazards that may be caused by manual operation.

[0016] Third, the air supply component of the present invention can accurately deliver gas to the corresponding air inlet channel according to the tilt direction of the mold, that is, the rotation angle of the built-in cylinder, through the setting of the accommodation hole, air inlet cavity and air inlet channel, thereby realizing the air blowing and cleaning of different sides of the mold without manual intervention in the switching process of gas delivery. And through the setting of the collection cavity, feed channel and concave air duct at the slag discharge port, using the suction force generated by gas flow and the action of gravity, the impurities blown down by the air blowing nozzle can be effectively collected into the collection cavity, avoiding the scattering of impurities around the device and keeping the working environment clean. Description of the Drawings

[0017] Figure 1 is a perspective view of a self-cleaning mold-making device for manhole cover casting; Figure 2 is a side view of a self-cleaning mold-making device for manhole cover casting in the casting state; Figure 3 is Figure 2 the cross-sectional view taken along the line A-A of Figure 4 is Figure 3 the three-dimensional cross-sectional view of Figure 5 is Figure 4 the enlarged partial view at B of Figure 6 is Figure 4 the enlarged partial view at C of Figure 7 is a top view of a self-cleaning mold-making device for manhole cover casting; Figure 8 is a cross-sectional view taken along the D-D section of a self-cleaning manhole cover casting molding device in the casting state; Figure 7 Figure 9 is a cross-sectional view taken along the D-D section of a self-cleaning manhole cover casting molding device in the cleaning state; Figure 7 Figure 10 is an exploded perspective view of a self-cleaning manhole cover casting molding device.

[0018] In the figure, the reference numerals are: 1, frame; 11, casting unit; 12, mold; 121, mounting plate; 122, first linear actuator; 123, support leg; 124, limit sleeve; 125, rotating seat; 13, mounting seat; 14, locking unit; 141, second linear actuator; 142, positioning rod; 2, inner cylinder; 21, linear slide rail; 22, rotary drive unit; 221, rotary actuator; 222, drive wheel; 223, transmission belt; 23, air blowing nozzle; 231, air inlet channel; 232, anti-sand cover; 24, slag discharge port; 241, concave air channel; 242, slag baffle; 25, rotating sleeve; 251, tooth groove; 26, positioning strip; 261, positioning jack; 3, air supply assembly; 31, air supply tank; 311, accommodation hole; 312, main air pipe; 313, branch air pipe; 314, air inlet chamber; 315, collection chamber; 316, feeding channel; 317, collection box; 32, air source. Detailed implementation manners

[0019] To further understand the features, technical means, specific purposes and functions achieved by the present invention, the present invention will be described in further detail below in conjunction with the accompanying drawings and specific implementation manners.

[0020] Refer to Figures 1 to 10 : ​​A molding device for casting a self-cleaning manhole cover, comprising a frame 1 and a casting unit 11 arranged on the frame 1. The casting unit 11 includes a sandblasting box and a mold 12. The mold 12 is installed on a mounting plate 121. A first linear drive 122 for driving the mounting plate 121 and the mold 12 to move horizontally is arranged on the frame 1. A built-in cylinder 2 is rotatably installed on one side of the frame 1 close to the first linear drive 122 of the casting unit 11. Two linear slide rails 21 extending along the axial direction are arranged on the inner wall of the built-in cylinder 2. The linear slide rails 21 are symmetrically arranged about the axis of the built-in cylinder 2. Support feet 123 are arranged on both sides of the mounting plate 121. The support feet 123 are slidably installed on the linear slide rails 21. A rotary drive unit 22 for driving the built-in cylinder 2 to rotate along its own axis is arranged on the frame 1; A plurality of air-blowing nozzles 23 are installed on the inner wall of the built-in cylinder 2. The air-blowing nozzles 23 are respectively located on both sides of the mold 12. An air inlet channel 231 communicating the outside of the built-in cylinder 2 with the air-blowing nozzles 23 is arranged on the built-in cylinder 2. The axis of the air inlet channel 231 forms a 45-degree angle with the surface of the mold 12. The air inlet channels 231 on both sides are symmetrically arranged about the mounting plate 121. A sand-proof cover 232 is hingedly installed at the output end of the air-blowing nozzle 23. An air supply assembly 3 is arranged on the frame 1. When the rotary drive unit 22 drives the built-in cylinder 2 to rotate so that one of the air inlet channels 231 is in a horizontal state, the air supply assembly 3 injects air into the air inlet channel 231, so that the air-blowing nozzles 23 blow and clean the downward-inclined side of the mold 12; Discharge ports 24 are arranged on both sides of the linear slide rail 21 far from the air-blowing nozzles 23 in the built-in cylinder 2. The impurities blown out by the air-blowing nozzles 23 are discharged through the discharge ports 24 when the rotary drive unit 22 drives the built-in cylinder 2 to rotate in the reverse direction.

[0021] When the manhole cover is cast in the present invention, the mounting plate 121 and the mold 12 are driven by the first linear driver 122 to move into the casting unit 11. The first linear driver 122 can be an oil cylinder, a cylinder, an electric push rod, etc. The casting unit 11 is a relatively mature prior art and will not be elaborated here. After the upper and lower sandblasting boxes of the casting unit 11 are closed for sandblasting, a casting mold is formed. After the casting mold is completed, the upper and lower sandblasting boxes are opened, and the first linear driver 122 moves the mounting plate 121 and the mold 12 into the inner cylinder 2 again. The staff manually or through a device such as a robotic arm removes the casting mold. During the casting process, the inner cylinder 2 keeps the linear slide rails 21 on both sides in a flush state, so as to ensure that the mounting plate 121 and the mold 12 enter and exit the casting unit 11 horizontally. At this time, the air blowing nozzle 23 on one side of the linear slide rail 21 is in an inclined upward state. Since the air blowing nozzle 23 is not connected to the air supply assembly 3 at this time and is in a non-blowing state, the anti-sand cover 232 hinged on the air blowing nozzle 23 fits against the output end of the air blowing nozzle 23 under the action of gravity, blocking the output end of the air blowing nozzle 23, effectively preventing the sand under the mold from falling into the air blowing nozzle under the action of gravity, avoiding affecting the next blowing efficiency and increasing the loss rate of the equipment. When the air blowing nozzle 23 is connected to the air supply assembly 3, the gas will automatically lift the anti-sand cover 232, and the anti-sand cover will not affect the gas jet direction. When the mounting plate 121 drives the mold 12 to completely enter the inner cylinder 2, the rotation driving unit 22 first drives the inner cylinder 2 to rotate 45 degrees along its own axis, so that the intake passage 231 on one side is in a horizontal state. Since the mold 12 cooperates with the linear slide rail 21 on the inner wall of the inner cylinder 2 through the support feet 123 on the mounting plate 121, the mold 12 rotates with the inner cylinder 2 and is in a state of being inclined at an angle of 45 degrees at this time. The air supply assembly 3 injects gas into the intake passage 231, and the gas will reach the air blowing nozzle 23 through the intake passage 231. The air blowing nozzle 23 blows and cleans the downward inclined side of the mold 12, blowing the impurities adhered to the forming surface of the mold 12 downward. After the impurities are blown out by the air blowing nozzle 23, the rotation driving unit 22 drives the inner cylinder 2 to rotate 90 degrees in the reverse direction, so that the other side of the mold 12 is inclined downward. The air supply assembly 3 injects gas into the intake passage 231 on the other side, and cooperates with the air blowing nozzle 23 on the other side to clean the other side of the mold 12. At the same time, the previously blown-out impurities move to the slag discharge port 24 under the action of gravity and the drive of the rotation of the inner cylinder 2, and are discharged out of the inner cylinder 2 through the slag discharge port 24, completing a cleaning and slag discharge process. Repeating the above rotation, air blowing and slag discharge operation steps multiple times can complete the double-sided self-cleaning of the mold 12. In this embodiment, the inner cylinder 2 drives the mold 12 to rotate, making the mold 12 inclined, and then the air supply assembly 3, the air blowing nozzle 23 and the intake passage 231 are used to blow and clean the surface of the downward inclined mold 12, effectively removing the impurities on the forming surface of the mold 12, ensuring the cleanliness of the mold 12, and improving the forming quality of the subsequent casting mold.In the built-in cylinder 2 of this embodiment, a slag discharge port 24 is provided. Under the action of the rotary drive unit 22, the impurities blown out by the air-blowing nozzle 23 can be automatically discharged, eliminating the need for manual impurity cleaning, improving work efficiency, and reducing the errors and safety hazards that may be caused by manual operation.

[0022] To solve the problem of how the air supply component 3 changes the gas delivery direction according to the inclination direction of the mold 12, the following features are specifically set: The air supply component 3 includes an air supply tank 31 and an air source 32. An accommodation hole 311 is provided on the air supply tank 31 that is in the same straight line as the built-in cylinder 2. The built-in cylinder 2 is rotatably installed in the accommodation hole 311, and the accommodation hole 311 fits against the outer wall of the built-in cylinder 2. A main air pipe 312 is provided at the top of the air supply tank 31. The input end of the main air pipe 312 is connected to the output end of the air source 32, and the output end of the main air pipe 312 communicates with two branch air pipes 313. The output end of each branch air pipe 313 is respectively communicated with two air inlet cavities 314 provided on the inner wall of the accommodation hole 311. When the rotary drive unit 22 drives the built-in cylinder 2 to rotate until the air inlet channel 231 is in a horizontal state, the horizontal air inlet channel 231 communicates with the air inlet cavity 314.

[0023] In this embodiment, the accommodation hole 311 on the air supply tank 31 is rotatably connected to the built-in cylinder 2, so the built-in cylinder 2 can freely rotate in the accommodation hole 311 against the inner wall of the accommodation hole 311. At this time, the main air pipe 312 is connected to the air source 32, and the output end of the main air pipe 312 communicates with two branch air pipes 313. The branch air pipes 313 are respectively communicated with two air inlet cavities 314 provided on the inner wall of the accommodation hole 311. When the rotary drive unit 22 drives the built-in cylinder 2 to start rotating, the mold 12 rotates with the built-in cylinder 2. When the built-in cylinder 2 rotates until one side of the air inlet channel 231 is in a horizontal state, at this time, the horizontal air inlet channel 231 communicates with one side of the air inlet cavity 314, the air inlet channel 231 on the other side is in a vertical state, and the air inlet cavity 314 on the other side is blocked by the outer wall of the built-in cylinder 2. The gas output by the air source 32 is shunted to the branch air pipes 313 through the main air pipe 312, and then enters the air inlet cavity 314 communicated with the branch air pipes 313, and finally enters the air inlet channel 231 that is in a horizontal state and communicates with the air inlet cavity 314. The gas flows along the air inlet channel 231 to the air-blowing nozzle 23, and the air-blowing nozzle 23 blows and cleans the downward-inclined side of the mold 12. By setting the accommodation hole 311, the air inlet cavity 314, and the air inlet channel 231 in this embodiment, the gas can be accurately delivered to the corresponding air inlet channel 231 according to the inclination direction of the mold 12, that is, the rotation angle of the built-in cylinder 2, thereby realizing the air-blowing cleaning of different sides of the mold 12, meeting the requirement of the device to change the gas delivery direction according to the inclination direction of the mold 12, eliminating the need for manual intervention in the switching process of gas delivery, and improving the automation degree of the entire device.

[0024] In order to achieve centralized collection of the blown-down impurities, the following features are specifically provided: A collection chamber 315 is provided at the bottom of the air supply box 31. Two feed channels 316 vertically extending to communicate with the accommodation holes 311 are provided on the collection chamber 315. The open ends of the feed channels 316 are respectively located below the intake chamber 314. An inwardly concave air channel 241 is provided at one end of the slag discharge port 24 on the outer wall of the inner cylinder 2. When the rotary drive unit 22 drives the inner cylinder 2 to rotate until one side intake channel 231 is in a horizontal state, the inwardly concave air channel 241 at the slag discharge port 24 on the same side as the mold 12 communicates with the intake chamber 314 and the feed channel 316 that are far from the intake channel 231 on this side.

[0025] In this embodiment, when the rotary drive unit 22 drives the inner cylinder 2 to rotate until one side intake channel 231 is in a horizontal state, the air supply assembly 3 injects air into the intake channel 231, and the air blowing nozzle 23 performs air blowing cleaning on the downwardly inclined side of the mold 12 to blow off the impurities on the forming surface of the mold 12. At this time, the slag discharge port 24 and the inwardly concave air channel 241 on the same side as the mold 12 are blocked by the inner wall of the accommodation hole 311 of the air supply box 31, and the impurities accumulate in the inner cylinder 2 under the action of gravity. Subsequently, with the reverse rotation of the subsequent inner cylinder 2, the blown-off impurities accumulate at the slag discharge port 24 under the action of gravity and the drive of the rotation of the inner cylinder 2. When the inner cylinder 2 rotates until the other side intake channel 231 is in a horizontal state, the inwardly concave air channel 241 at the slag discharge port 24 where the impurities were originally accumulated communicates with the intake chamber 314 and the feed channel 316 that are far from the intake channel 231 on this side. The impurities enter the collection chamber 315 in the air supply box 31 through the slag discharge port 24, the inwardly concave air channel 241, and the feed channel 316. And because the inwardly concave air channel 241 at the slag discharge port 24 communicates with the intake chamber 314 and the feed channel 316, the gas flow transported to the intake chamber 314 on this side by the gas source 32 will be transported into the feed channel 316 through the inwardly concave air channel 241. The air flow flowing in the inwardly concave air channel 241 generates a certain negative pressure at the slag discharge port 24, assisting in sucking the impurities discharged from the slag discharge port 24 along the inwardly concave air channel 241 and the feed channel 316 into the collection chamber 315, realizing the centralized collection of the impurities. The rotary drive unit 22 drives the inner cylinder 2 to rotate in the reverse direction again, repeating the above processes of air blowing cleaning, impurity discharging, and collection, and collecting the impurities on the other side into the collection chamber 315 as well. In this embodiment, by providing the collection chamber 315, the feed channel 316, and the inwardly concave air channel 241 at the slag discharge port 24, and utilizing the suction force generated by the gas flow and the action of gravity, the impurities blown off by the air blowing nozzle 23 can be effectively collected into the collection chamber 315, avoiding the impurities from scattering around the device and keeping the working environment clean.

[0026] In order to enable the air blowing nozzle 23 to perform comprehensive air blowing cleaning on various positions of the mold 12, the following features are specifically provided: The intake channels 231 are distributed in a matrix along the length and width directions of the mounting frame plate 121.

[0027] In this embodiment, since the intake channels 231 are distributed in a matrix along the length and width directions of the mounting frame plate 121, these intake channels 231 that are in a horizontal state and communicate with the intake cavity 314 will simultaneously convey the gas provided by the gas source 32 to the corresponding air-blowing nozzles 23. At this time, the air-blowing nozzles 23 will blow and clean the downwardly inclined side of the mold 12 from multiple different positions and angles. This avoids cleaning dead corners and ensures that every part of the forming surface of the mold 12 can be effectively cleaned, thereby improving the cleaning quality of the mold 12.

[0028] In order to prevent the blown impurities from falling on the linear slide rail 21 and affecting the movement of the mold 12, the following features are specifically set: A slag baffle 242 is provided at the opening of the slag discharge port 24 inside the inner cylinder 2, and the two slag baffles 242 are respectively located on both sides of the linear slide rail 21 away from the air-blowing nozzle 23.

[0029] In this embodiment, a slag baffle 242 is provided at the opening of the slag discharge port 24 inside the inner cylinder 2, and the two slag baffles 242 are respectively located on both sides of the linear slide rail 21 away from the air-blowing nozzle 23. When the impurities reach near the linear slide rail 21 during movement, the slag baffle 242 will block the impurities from continuing to fall towards the linear slide rail 21, restricting the impurities to the side of the slag baffle 242 close to the slag discharge port 24.

[0030] In order to facilitate the cleaning and collection of impurities in the collection cavity 315, the following features are specifically set: An opening is provided on one side of the collection cavity 315, and a collection box 317 is slidably installed in the collection cavity 315.

[0031] In this embodiment, a collection box 317 is slidably installed in the collection cavity 315, and the impurities that fall into the collection cavity 315 enter the collection box 317, and the staff can clean the collection box 317 regularly.

[0032] In order to solve the problem of how the rotary drive unit 22 accurately drives the inner cylinder 2 to rotate to a suitable angle, the following features are specifically set: The built-in cylinder 2 is rotatably installed in a plurality of mounting seats 13 provided on the frame 1. One end of the built-in cylinder 2 is coaxially installed with a rotating sleeve 25. A toothed groove 251 surrounding the outside of the rotating sleeve 25 is provided on the rotating sleeve 25. The rotation drive unit 22 includes a rotation driver 221 fixedly installed on the frame 1. The rotation axis of the rotation driver 221 is parallel to the axis of the built-in cylinder 2. A drive wheel 222 is coaxially installed on the rotation axis of the rotation driver 221. The drive wheel 222 is in transmission connection with the toothed groove 251 outside the rotating sleeve 25 through a transmission belt 223. A locking unit 14 for locking the rotation angle of the built-in cylinder 2 is provided on the mounting seat 13.

[0033] In this embodiment, when the mold 12 needs to be cleaned, the rotation driver 221 is started. The rotation driver 221 can be a servo motor. The rotation axis of the rotation driver 221 drives the drive wheel 222 to rotate. The drive wheel 222 transmits power to the rotating sleeve 25 through the transmission belt 223. Since the rotating sleeve 25 is coaxially installed with the built-in cylinder 2, the built-in cylinder 2 is driven to rotate around its own axis. Once the built-in cylinder 2 rotates to a predetermined angle, the locking unit 14 on the mounting seat 13 is activated to lock the built-in cylinder 2 in the current position, and the rotation driver 221 stops rotating to ensure that the built-in cylinder 2 does not deviate in angle during the air blowing cleaning process.

[0034] To solve the problem of how the locking unit 14 locks the rotation angle of the built-in cylinder 2, the following features are specifically set: The locking unit 14 includes a second linear driver 141 fixedly installed on the mounting seat 13. The working end of the second linear driver 141 moves along the radial direction of the built-in cylinder 2. A positioning rod 142 is installed on the working end of the second linear driver 141. The positioning rod 142 extends along the radial direction of the built-in cylinder 2. Three positioning strips 26 are provided on the outer wall of the built-in cylinder 2. Positioning jacks 261 extending along the radial direction of the built-in cylinder 2 are provided on the positioning strips 26. When the positioning rod 142 is inserted into the positioning jack 261, the rotation angle of the built-in cylinder 2 is locked.

[0035] The included angle between the axes of two adjacent positioning jacks 261 is forty-five degrees.

[0036] In this embodiment, when the rotation drive unit 22 drives the inner cylinder 2 to rotate and the positioning insertion hole 261 on the positioning strip 26 moves to align with the positioning rod 142, the second linear drive 141 drives the positioning rod 142 to insert into the positioning insertion hole 261, thereby locking the inner cylinder 2 at the current rotation angle. There are three positioning strips 26 provided on the outer wall of the inner cylinder 2, and the included angle between the axes of two adjacent positioning insertion holes 261 is 45 degrees, so that the inner cylinder 2 can be locked when it rotates to the state where the mold 12 is in a horizontal state and inclined 45 degrees on both sides. The diameters of the positioning insertion hole 261 and the positioning rod 142 in this embodiment can be set according to actual requirements. The staff can coaxially install a photoelectric sensor at one end of the positioning rod 142 facing the positioning insertion hole 261, with the working end of the photoelectric sensor facing one end of the positioning insertion hole 261. A receiver facing the opening end is coaxially arranged in the positioning insertion hole 261. The photoelectric sensor is signal-connected to the second linear drive 141 and the rotation drive 221 through a controller. After the photoelectric sensor is activated, when the inner cylinder 2 rotates to align the positioning rod 142 with the positioning insertion hole 261, the receiver in the positioning insertion hole 261 receives the photoelectric sensor signal from the positioning rod 142, and it can be determined that the positioning insertion hole 261 and the positioning rod 142 are on the same straight line. Then, the rotation drive 221 is stopped through the controller, and the second linear drive 141 is activated to make the positioning rod 142 insert into the positioning insertion hole 261. In this embodiment, the photoelectric sensor and the receiver are respectively installed in the concave holes provided on the positioning rod 142 and the positioning insertion hole 261, so as to prevent the photoelectric sensor and the receiver from colliding when the positioning rod 142 inserts into the positioning insertion hole 261.

[0037] In order to prevent the rotation of the mold 12 from affecting the connection between the mounting frame plate 121 and the working end of the first linear drive 122, the following features are specifically set: The first linear drive 122 is fixedly installed at one end of the inner cylinder 2 away from the frame 1. The working end of the first linear drive 122 is on the same straight line as the axis of the inner cylinder 2. A limit sleeve 124 is provided at one end of the mounting frame plate 121 facing the first linear drive 122. The axis of the limit sleeve 124 is on the same straight line as the axis of the inner cylinder 2. A rotating seat 125 is coaxially and rotatably installed in the limit sleeve 124. The rotating seat 125 is fixedly connected to the working end of the first linear drive 122.

[0038] In this embodiment, when the mold 12 needs to be cleaned and the rotary drive unit 22 drives the inner cylinder 2 to rotate about its own axis, since the rotating seat 125 can rotate coaxially within the limit sleeve 124, the rotation of the inner cylinder 2 will not directly interfere with the connection between the first linear drive 122 and the mounting plate 121. The rotating seat 125 will rotate within the limit sleeve 124 as the inner cylinder 2 rotates, ensuring that the mounting plate 121 and the mold 12 can rotate together with the inner cylinder 2 while maintaining the connection stability between the first linear drive 122 and the mounting plate 121.

[0039] Working principle: When casting a manhole cover, the first linear drive 122 drives the mounting plate 121 and the mold 12 to move into the casting unit 11. After the upper and lower sand boxes of the casting unit 11 are closed, sandblasting is carried out to form a casting mold. After the casting mold is completed, the upper and lower sand boxes are opened, and the first linear drive 122 drives the mounting plate 121 and the mold 12 to move into the inner cylinder 2. The staff manually or through a robotic arm or other devices removes the casting mold. When the mounting plate 121 drives the mold 12 to completely enter the inner cylinder 2, the rotary drive unit 22 first drives the inner cylinder 2 to rotate 45 degrees along its own axis, so that the air inlet channel 231 on one side is in a horizontal state. At this time, the mold 12 rotates with the inner cylinder 2 and is in a state of being inclined at a 45-degree angle. The air supply assembly 3 injects gas into the air inlet channel 231, and the gas will reach the air blowing nozzle 23 through the air inlet channel 231. The air blowing nozzle 23 blows and cleans the downward-inclined side of the mold 12, blowing down the impurities adhered to the forming surface of the mold 12. After the impurities are blown out by the air blowing nozzle 23, the rotary drive unit 22 drives the inner cylinder 2 to rotate reversely by 90 degrees, so that the other side of the mold 12 is downward-inclined. The air supply assembly 3 injects gas into the air inlet channel 231 on the other side, and cooperates with the air blowing nozzle 23 on the other side to clean the other side of the mold 12. At the same time, the previously blown-out impurities move to the slag discharge port 24 under the action of gravity and the drive of the rotation of the inner cylinder 2, and are discharged out of the inner cylinder 2 through the slag discharge port 24, completing a cleaning and slag discharge process. Repeating the above operation steps of rotation, air blowing, and slag discharge multiple times can complete the double-sided self-cleaning of the mold 12.

[0040] The above embodiments only represent one or several implementation manners of the present invention, and the description is relatively specific and detailed, but it should not be construed as a limitation to the scope of the present invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A molding device for casting a self-cleaning manhole cover, comprising a frame and a casting unit arranged on the frame. The casting unit includes a sandblasting box and a mold. The mold is installed on a mounting plate. A first linear driver for driving the mounting plate and the mold to move horizontally is arranged on the frame. It is characterized in that, The frame is rotatably installed with an inner cylinder on the side close to the first linear drive of the casting unit. Two linear sliding rails extending along the axial direction are arranged on the inner wall of the inner cylinder. The linear sliding rails are symmetrically arranged about the axis of the inner cylinder. Support feet are arranged on both sides of the mounting plate, and the support feet are slidably installed on the linear sliding rails. A rotation drive unit for driving the inner cylinder to rotate along its own axis is arranged on the frame; A plurality of air-blowing nozzles are installed on the inner wall of the inner cylinder. The air-blowing nozzles are respectively located on both sides of the mold. An air inlet channel communicating the outside of the inner cylinder with the air-blowing nozzles is arranged on the inner cylinder. The axis of the air inlet channel forms a 45-degree angle with the surface of the mold. The air inlet channels on both sides are symmetrically arranged about the mounting plate. The output end of the air-blowing nozzle 23 is hingedly installed with a sand-proof cover. A gas supply assembly is arranged on the frame. When the rotation drive unit drives the inner cylinder to rotate until one of the air inlet channels is in a horizontal state, the gas supply assembly injects gas into the air inlet channel, so that the air-blowing nozzles perform air-blowing cleaning on the downward-inclined side of the mold; Discharge ports are arranged on both sides of the linear sliding rail far from the air-blowing nozzles inside the inner cylinder. The impurities blown out by the air-blowing nozzles are discharged through the discharge ports when the rotation drive unit drives the inner cylinder to rotate in the reverse direction.

2. The molding device for casting a self-cleaning manhole cover according to claim 1, characterized in that, The gas supply assembly includes a gas supply tank and a gas source. A receiving hole on the same straight line as the inner cylinder is arranged on the gas supply tank. The inner cylinder is rotatably installed in the receiving hole, and the receiving hole fits the outer wall of the inner cylinder; A main gas pipe is arranged at the top of the gas supply tank. The input end of the main gas pipe is connected to the output end of the gas source, and the output end of the main gas pipe communicates with two branch gas pipes. The output end of each branch gas pipe is respectively communicated with two air inlet cavities arranged on the inner wall of the receiving hole; When the rotation drive unit drives the inner cylinder to rotate until the air inlet channel is in a horizontal state, the air inlet channel in the horizontal state communicates with the air inlet cavity.

3. The molding device for casting a self-cleaning manhole cover according to claim 2, wherein, A collection cavity is arranged at the bottom of the gas supply tank. Two feed channels vertically extending to communicate with the receiving hole are arranged on the collection cavity. The open ends of the feed channels are respectively located below the air inlet cavities; An inner concave air channel is arranged at one end of the discharge port on the outer wall of the inner cylinder. When the rotation drive unit drives the inner cylinder to rotate until one of the air inlet channels is in a horizontal state, the inner concave air channel at the discharge port on the same side as the mold communicates with the air inlet cavity and the feed channel far from the air inlet channel on that side.

4. The molding device for casting a self-cleaning manhole cover according to claim 3, characterized in that, The air inlet channels are distributed in a matrix along the length direction and width direction of the mounting plate.

5. The molding device for self-cleaning manhole cover casting according to claim 3, characterized in that, A slag blocking plate is arranged at the opening of the discharge port inside the inner cylinder. The two slag blocking plates are respectively located on both sides of the linear sliding rail far from the air-blowing nozzles.

6. A molding device for casting a self-cleaning manhole cover according to claim 3, characterized in that, An opening is arranged on one side of the collection cavity, and a collection box is slidably installed in the collection cavity.

7. A molding device for casting a self-cleaning manhole cover according to claim 3, characterized in that, The inner cylinder is rotatably installed in a plurality of mounting seats arranged on the frame. A rotary sleeve is coaxially installed at one end of the inner cylinder, and a tooth groove surrounding the outside of the rotary sleeve is arranged on the rotary sleeve; The rotation drive unit includes a rotary driver fixedly installed on the frame. The rotation axis of the rotary driver is parallel to the axis of the inner cylinder. A driving wheel is coaxially installed on the rotation axis of the rotary driver, and the driving wheel is connected to the tooth groove outside the rotary sleeve through a transmission belt; A locking unit for locking the rotation angle of the inner cylinder is arranged on the mounting seat.

8. A molding device for casting a self-cleaning manhole cover according to claim 7, characterized in that, The locking unit includes a second linear driver fixedly installed on the mounting base. The working end of the second linear driver moves radially along the inner cylinder. A positioning rod is installed on the working end of the second linear driver, and the positioning rod extends radially along the inner cylinder. Three positioning strips are provided on the outer wall of the inner cylinder. Positioning jacks extending radially along the inner cylinder are provided on the positioning strips. When the positioning rod is inserted into the positioning jacks, the rotation angle of the inner cylinder is locked.

9. The molding device for casting a self-cleaning manhole cover according to claim 8, characterized in that, The included angle between the axes of two adjacent positioning jacks is 45 degrees.

10. The molding device for casting a self-cleaning manhole cover according to claim 3, characterized in that, The first linear driver is fixedly installed at one end of the inner cylinder away from the frame. The working end of the first linear driver is on the same straight line as the axis of the inner cylinder. A limiting sleeve is provided at one end of the mounting frame plate facing the first linear driver. The axis of the limiting sleeve is on the same straight line as the axis of the inner cylinder. A rotating seat is coaxially and rotatably installed in the limiting sleeve, and the rotating seat is fixedly connected to the working end of the first linear driver.

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