Automatic polishing and cleaning device in front of packaging furnace

Abstract

The invention relates to the technical field of nodular cast iron pipe machining and manufacturing, in particular to an automatic polishing and cleaning device in front of a packaging furnace. The device comprises a first rail and a second rail which are arranged in parallel, and a rail gap is formed between the first rail and the second rail; a centering structure, a first face chamfering structure, a bell mouth cleaning structure and a bell mouth spraying structure which are in signal connection with the control box are arranged on the outer side of the first track; a socket outer cleaning structure and a socket inner chamfering structure which are in signal connection with the control box are arranged on the outer side of the second track; pipe limiting structures are arranged above the centering structure, the first face chamfering structure, the bell mouth cleaning structure and the bell mouth spraying structure, a blocking and shifting assembly is arranged between every two adjacent structures, and the pipe limiting structures and the blocking and shifting assemblies are also in signal connection with the control box. The technical problem that in the prior art, the quality of the produced nodular cast iron pipe is poor due to the fact that chamfering and bellmouth cleaning are conducted in a spigot manually and the spigot outer surface cleaning procedure is lacked is effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of ductile iron pipe processing and manufacturing, and particularly relates to an automatic grinding and cleaning device in front of a packaging furnace. Background Art

[0002] A ductile iron pipe is a steel pipe made of ductile iron. By adding a spheroidizing agent to the molten iron, graphite precipitates in a spherical shape, thereby significantly improving the mechanical properties and comprehensive properties of the material. It is widely used in fields such as water supply and drainage, gas transmission, and industrial pipelines. Before entering the packaging furnace, the ductile iron pipe needs to be chamfered on the first side of the socket to grind the cold glue on the first side of the socket flat and clean, ensuring its external quality, improving the paint film adhesion, and ensuring its aesthetics. The existing chamfering on the first side of the socket is ground by an angle grinder, and the chamfering quality cannot be guaranteed, and the labor intensity is high and the work efficiency is low.

[0003] In view of the above problems, the patent document with the authorization announcement number CN105751027B discloses an automatic chamfering device for the first side of the socket of a ductile iron pipe. The device includes a small carriage frame, a small carriage, a cylinder, a motor, a bearing seat, and a chamfering grinding head. Along the length direction of the small carriage frame, there are two parallel tracks for the small carriage to travel. A support plate perpendicular to its bottom surface is installed on the small carriage. A motor and a bearing seat are fixedly installed on the support plate. A motor pulley is installed at the lower end of the motor, and a pulley is installed at the lower end of the bearing seat. The motor pulley and the pulley are connected by a belt drive. A chamfering grinding head is installed at the upper end of the bearing seat, and a grinding wheel is installed at the upper end of the chamfering grinding head. A cylinder is fixedly installed at the front end of the small carriage frame, and a cylinder head is installed at the bottom of the small carriage. The front end of the cylinder is fixedly connected to the cylinder head. By pushing the cylinder head by the cylinder, the small carriage is driven to travel along the track; a supporting wheel base and a positioning stop wheel are fixedly installed on the ground. A supporting wheel for driving the ductile iron pipe to rotate is installed on the supporting wheel base, and a detection probe signal-connected to a PLC is installed at the positioning stop wheel. During chamfering, precise positioning of the ductile iron pipe is achieved through the positioning stop wheel, and the chamfering of the first side of the socket is controlled by controlling the movement of the cylinder through the PLC, reducing the labor intensity of workers and improving the efficiency.

[0004] However, for ductile iron pipes, before entering the packaging heating furnace, in addition to chamfering the first side of the socket, it usually also includes chamfering the inner side of the spigot, cleaning the inside of the socket, spraying the socket, etc. Currently, chamfering the inner side of the spigot still relies on manual chamfering, and the consistency of the chamfering angle is poor; the cleaning of the socket is usually carried out using a straight grinder, and it is easy to have the situation of incomplete cleaning; there is no outer cleaning station for the spigot, and the outer surface of the spigot cannot be cleaned, affecting the quality of the produced products. Summary of the Invention

[0005] The present invention provides an automatic grinding and cleaning device in front of a packaging furnace to solve the technical problem in the prior art that manual chamfering inside the socket and cleaning the socket end are carried out, and there is a lack of a process for cleaning the outer surface of the socket, resulting in poor quality of the ductile iron pipes produced.

[0006] To solve the above problems, the automatic grinding and cleaning device in front of the packaging furnace provided by the present invention adopts the following technical solutions:

[0007] An automatic grinding and cleaning device in front of a packaging furnace includes a first track and a second track arranged in parallel, and a track gap is formed between the first track and the second track; along the conveying direction of the ductile iron pipe, a centering structure, a first surface chamfering structure, a socket end cleaning structure and a socket end spraying structure are sequentially arranged on the outer side of the first track; on the outer side of the second track, there is an outer socket cleaning structure opposite to the position of the first surface chamfering structure and an inner socket chamfering structure opposite to the position of the socket end cleaning structure; above the centering structure, the first surface chamfering structure, the socket end cleaning structure and the socket end spraying structure, there are pipe limiting structures, and between the centering structure and the first surface chamfering structure, between the first surface chamfering structure and the socket end cleaning structure, and between the socket end cleaning structure and the socket end spraying structure in the track gap, there are blocking and deflecting components; the centering structure, the first surface chamfering structure, the socket end cleaning structure, the socket end spraying structure, the outer socket cleaning structure, the socket end cleaning structure, the pipe limiting structure and the blocking and deflecting components are all connected to the control box by signals.

[0008] The beneficial effects of the automatic grinding and cleaning device in front of the packaging furnace provided by the present invention are as follows:

[0009] 1. By arranging a centering device, an inner socket chamfering structure, a socket end cleaning structure and an outer surface cleaning structure of the socket in the conveying direction of the ductile iron pipe, not only can the position adjustment before chamfering of the ductile iron pipe be realized, but also the cleaning of the socket end after the first surface chamfering of the ductile iron pipe, the cleaning of the outer surface before chamfering of the socket and the inner chamfering of the socket can be realized, ensuring the quality of the ductile iron pipe.

[0010] 2. By arranging a pipe limiting structure above the centering structure, the first chamfering structure on the surface, the socket cleaning structure, and the socket spraying structure, and connecting the pipe limiting structure to the control box by signal, it can automatically detect whether the ductile iron pipe is accurately transported to the centering station, the first chamfering station on the surface, the socket cleaning station, and the socket spraying station, and transmit the detected signal to the control box, facilitating the control box to accurately control the centering process, the first chamfering process on the surface, the socket cleaning process, the outer cleaning process of the socket, the inner chamfering process of the socket, and the socket spraying process, and accurately control and adjust the duration of each process according to the different radial dimensions of the ductile iron pipe. Each processing process does not require manual operation by workers. Workers only need to operate the control box, which greatly reduces the labor intensity of workers and improves the processing accuracy.

[0011] 3. By arranging a blocking and shifting component in the track gap, between the centering structure and the first chamfering structure on the surface, between the first chamfering structure on the surface and the socket cleaning structure, and between the socket cleaning structure and the socket spraying structure, and connecting the blocking and shifting component to the control box by signal, after the previous process is completed, the control box can control the operation of the blocking and shifting component to give the ductile iron pipe an initial force to move to the next process, and no manual operation is required, which greatly reduces the labor intensity of workers.

[0012] Through the above settings, the present invention effectively solves the technical problem in the prior art that manual inner chamfering of the socket and socket cleaning are carried out, and there is a lack of outer surface cleaning process for the socket, resulting in poor quality of the produced ductile iron pipe.

[0013] Further, the pipe limiting structure includes a position feedback sensor.

[0014] Further, the centering structure includes an actuator and a top block installed at the output end of the actuator. A front limiting member and a rear limiting member are respectively arranged on the front side and the rear side of the top block in the ejecting direction.

[0015] Beneficial effects: By arranging a front limiting member on the front side of the top block in the ejecting direction, it can prevent the top block from protruding excessively, avoid hard collision between the top block and the socket end of the ductile iron pipe, and reduce the risk of damage to the ductile iron pipe. By arranging a rear limiting member on the rear side of the top block in the ejecting direction, it can prevent the top block from retracting excessively and ensure that the actuator is always within the effective stroke.

[0016] Further, the blocking and shifting component includes an actuator, a transmission rod, a rotating rod, and a blocking and shifting member. The actuator is rotatably installed on the base, its output end is hinged to one end of the transmission rod, the other end of the transmission rod is fixedly connected to the rotating rod, both ends of the rotating rod are respectively rotatably connected to the first track and the second track, and the blocking and shifting member is fixedly installed on the rotating rod.

[0017] Further, the blocking and shifting member is a concave arc structure.

[0018] Beneficial effects: The blocking and deflecting member is arranged in a concave arc structure, which can ensure that the contact surface between the blocking and deflecting member and the ductile iron pipe is a continuous curved surface when deflecting the ductile iron pipe, making the pressure distribution on the ductile iron pipe more uniform, reducing the possibility of stress concentration, and guiding the ductile iron pipe to move along a preset trajectory to reduce the yaw phenomenon.

[0019] Furthermore, the socket cleaning assembly includes a traveling trolley, a driving structure and a cleaning member. The driving structure is installed on the traveling trolley, and the cleaning member is installed at the output end of the driving structure. The driving structure is used to drive the cleaning member to rotate.

[0020] Furthermore, the first track has first limiting notch, second limiting notch, third limiting notch and fourth limiting notch corresponding to the centering structure, the first chamfering structure of the surface, the socket cleaning structure and the socket spraying structure respectively, for accommodating the socket end of the ductile iron pipe; the second track has the same structural form as the first track.

[0021] Furthermore, V-shaped wheels are installed in the first limiting notch, and supporting wheels are installed in the second limiting notch, the third limiting notch and the fourth limiting notch.

[0022] Furthermore, the first track includes a plurality of sub-tracks, and the first limiting notch, the second limiting notch, the third limiting notch and the fourth limiting notch are formed between two adjacent sub-tracks.

[0023] Beneficial effects: Designing the first track as a structure including a plurality of sub-tracks ensures the independence of the sub-tracks, so that the distance between two adjacent sub-tracks can be adjusted according to the usage requirements during use, with stronger flexibility, and when a fault occurs in the first track, the sub-track at the faulty position can be replaced separately, reducing the maintenance cost.

[0024] Furthermore, a lifting platform corresponding to the position of the socket spraying structure is arranged in the track gap. Description of the Drawings

[0025] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood. In the drawings, several embodiments of the present invention are shown in an exemplary rather than restrictive manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0026] Figure 1 is a schematic structural diagram of the automatic grinding and cleaning device in front of the packaging furnace provided by the present invention;

[0027] Figure 2Schematic diagram of the structure of the V-shaped wheel in the automatic grinding and cleaning device in front of the packaging furnace provided by the present invention;

[0028] Figure 3 Schematic diagram of the structure of the supporting wheel in the automatic grinding and cleaning device in front of the packaging furnace provided by the present invention;

[0029] Figure 4 Schematic diagram of the structure of the blocking and dialing assembly in the automatic grinding and cleaning device in front of the packaging furnace provided by the present invention.

[0030] Explanation of reference numerals:

[0031] 1. First track; 2. Second track; 3. Track gap; 4. Control box; 5. Actuator; 6. Output end; 7. Top block; 8. Front limit member; 9. Rear limit member; 10. Transmission rod; 11. Rotating rod; 12. Blocking and dialing member; 13. Driving structure; 14. Cleaning member; 15. V-shaped wheel; 16. Ductile iron pipe; 17. Lifting platform; 18. Driving machine; 19. Rotating shaft; 20. Chamfering head; 21. V-shaped wheel support seat; 22. Supporting wheel support seat; 23. Supporting wheel; 24. Base; 25. Limit seat; 26. Base plate. Detailed implementation manners

[0032] The principles and spirit of the present invention will be explained in detail below with reference to several representative embodiments of the present invention.

[0033] Embodiment of the automatic grinding and cleaning device in front of the packaging furnace provided by the present invention:

[0034] As Figures 1 to 4 shown, the automatic grinding and cleaning device in front of the packaging furnace includes a first track 1, a second track 2, a centering structure, a first chamfering structure on the surface, a socket cleaning structure, a socket spraying structure (not shown in the figure), an outer cleaning structure for the socket, an inner chamfering structure for the socket, a pipe limiting structure (not shown in the figure), a blocking and dialing assembly, and a control box 4.

[0035] Among them, the first track 1 and the second track 2 are arranged in parallel, and a track gap 3 is formed between the two; along the conveying direction of the ductile iron pipe 16, a centering structure, a first chamfering structure on the surface, a socket cleaning structure, and a socket spraying structure are sequentially arranged on the outer side of the first track 1; on the outer side of the second track 2, there are an outer cleaning structure for the socket opposite to the position of the first chamfering structure and an inner chamfering structure for the socket opposite to the position of the socket cleaning structure.

[0036] In order to realize the automation of grinding, cleaning and spraying, pipe limiting structures are arranged above the centering structure, the first chamfering structure, the socket cleaning structure and the socket spraying structure to detect whether the ductile iron pipe 16 is transported in place; in the track gap 3, between the centering structure and the first chamfering structure, between the first chamfering structure and the socket cleaning structure, and between the socket cleaning structure and the socket spraying structure, blocking and deflecting components are arranged to assist the ductile iron pipe 16 in being transported between adjacent two workstations; the centering structure, the first chamfering structure, the socket cleaning structure, the socket spraying structure, the outer socket cleaning structure, the socket cleaning structure, the pipe limiting structure and the blocking and deflecting components are all connected to the control box 4 in signal connection.

[0037] During use, the control box 4 accurately controls the progress of the centering process, the first chamfering process, the socket cleaning process, the outer socket cleaning process, the inner socket chamfering process and the socket spraying process, and accurately controls and adjusts the duration of each process according to the different radial dimensions of the ductile iron pipe 16. The control box 4 controls the operation of the blocking and deflecting components to give the ductile iron pipe 16 an initial acting force to move to the next process. In the whole process, only the worker needs to operate the control box 4, which can greatly reduce the labor intensity of the worker and improve the processing accuracy.

[0038] Regarding the first track 1 and the second track 2. The first track 1 has a first limiting notch, a second limiting notch, a third limiting notch and a fourth limiting notch corresponding to the centering structure, the first chamfering structure, the socket cleaning structure and the socket spraying structure respectively, for accommodating the socket end of the ductile iron pipe 16; the structural form of the second track 2 is the same as that of the first track 1, and the only difference is that the first limiting notch, the second limiting notch, the third limiting notch and the fourth limiting notch in the second track 2 are used to accommodate the spigot end of the ductile iron pipe 16.

[0039] A V-shaped wheel 15 is installed in the first limiting notch, and supporting wheels 23 are installed in the second limiting notch, the third limiting notch and the fourth limiting notch to support the ductile iron pipe 16 and drive the ductile iron pipe 16 to rotate stably. As Figure 2 shown, the V-shaped wheel 15 is installed on the V-shaped wheel support seat 21, as Figure 3 shown, the supporting wheel 23 is installed on the supporting wheel support seat 22.

[0040] In this embodiment, the first track 1 includes a plurality of sub-tracks, and the first limiting notch, the second limiting notch, the third limiting notch and the fourth limiting notch are formed between adjacent two sub-tracks; in other embodiments, the first track 1 is of an integral structure, and the first limiting notch, the second limiting notch, the third limiting notch and the fourth limiting notch are opened on its top surface.

[0041] Regarding the centering structure. The centering structure includes a bottom plate 26, an actuator 5, a top block 7, a front limit member 8, and a rear limit member 9. Among them, the actuator 5 is fixedly installed on the bottom plate 26, the top block 7 is installed at the output end 6 of the actuator 5, and the front limit member 8 and the rear limit member 9 are both installed on the bottom plate 26 and are respectively located on the front side and the rear side of the ejection direction of the top block 7 to limit the ejection distance of the top block 7. The actuator 5 is signal-connected to the control box 4. In this embodiment, the actuator 5 is a cylinder. In other embodiments, the actuator 5 is an oil cylinder or an electric actuator 5.

[0042] Regarding the first surface chamfering structure. The first surface chamfering structure includes a driving machine 18, a chamfering head 20 installed on the rotating shaft 19 of the driving machine 18, and a limit stop member (not shown in the figure) located beside the driving machine 18. The limit stop member is used to limit the movement of the ductile iron pipe 16 towards the driving machine 18 during the chamfering process, thereby ensuring the quality of the chamfering. The driving machine 18 is signal-connected to the control box 4.

[0043] Specifically, the driving machine 18 is a motor and is signal-connected to the control box 4; the driving machine 18 is inclinedly arranged, and the included angle between its rotating shaft 19 and the axial direction of the ductile iron pipe 16 located in the third limit slot is an acute angle.

[0044] Regarding the socket cleaning structure and the outer cleaning structure of the spigot. The socket cleaning structure includes a traveling trolley, a driving structure 13, and a cleaning member 14. The driving structure 13 is installed on the traveling trolley (not shown in the figure), the cleaning member 14 is installed at the output end 6 of the driving structure 13, and the driving structure 13 is used to drive the cleaning member 14 to rotate. The traveling trolley and the driving structure 13 are both signal-connected to the control box 4; the structural composition of the outer cleaning structure of the spigot is the same as that of the socket cleaning structure.

[0045] Specifically, the socket cleaning structure is coaxially arranged with the ductile iron pipe 16 located in the third limit slot; the outer cleaning assembly of the spigot is arranged on the outer periphery of the ductile iron pipe 16 located in the second limit slot, and the axis where the output end 6 of the outer cleaning assembly of the spigot is located is consistent with the axial direction of the ductile iron pipe 16.

[0046] Regarding the inner chamfering structure of the spigot. The inner chamfering structure of the spigot includes a driving machine 18, a chamfering head 20 installed on the rotating shaft 19 of the driving machine 18, and a limit stop member located beside the driving machine 18. The limit stop member is used to limit the movement of the ductile iron pipe 16 towards the driving machine 18 during the chamfering process, thereby ensuring the quality of the chamfering. The driving machine 18 is signal-connected to the control box 4.

[0047] Regarding the blocking and deflecting assembly. As Figure 4As shown in the figure, the blocking and shifting assembly includes an actuator 5, a transmission rod 10, a rotating rod 11, and a blocking and shifting member 12. The actuator 5 is rotatably installed on the base 24, and its output end 6 is hinged to one end of the transmission rod 10. The other end of the transmission rod 10 is fixedly connected to the middle part in the length direction of the rotating rod 11. Both ends of the rotating rod 11 are rotatably connected to the first track 1 and the second track 2 respectively. The blocking and shifting member 12 is fixedly installed on the rotating rod 11, and the blocking and shifting member 12 is a concave arc structure. In this embodiment, the number of the blocking and shifting members 12 is two, and the two blocking and shifting members 12 are respectively located at both ends in the length direction of the rotating rod 11; in other embodiments, the number of the blocking and shifting members 12 is one, or three, or more than three.

[0048] In order to prevent the rotating rod 11 from moving downward excessively, a limit seat 25 is further provided beside the actuator 5, so that after the rotating rod 11 moves down to the limit seat 25, an upward supporting force is given to the rotating rod 11 by the limit seat 25.

[0049] In addition, buffer pads are provided on the top surfaces of the first track 1 and the second track 2 before the first limit notch, before the second limit notch, before the third limit notch, and before the fourth limit notch, so as to buffer the forward impact force of the ductile iron pipe 16 and ensure that the ductile iron pipe 16 can accurately fall into the limit notch; a lifting platform 17 corresponding to the position of the socket spraying structure is arranged in the track gap 3 to be used for lifting the ductile iron pipe 16 after the socket spraying is completed.

[0050] It should be noted that the pipe limiting structure includes a position feedback sensor, and the position feedback sensor can be a laser displacement sensor or a fiber grating sensor; the socket spraying structure includes a nozzle extending into the socket of the ductile iron pipe 16, and the nozzle is connected to a coating storage container through a pipeline.

[0051] The working principle of the automatic grinding and cleaning device in front of the packaging furnace provided by the present invention is as follows:

[0052] When the ductile iron pipe 16 is transported to the V-shaped wheel 15 along the first track 1 and the second track 2, the pipe limiting structure located above the centering station detects that the ductile iron pipe 16 has been transported in place, and transmits the detected signal to the control box 4. The control box 4 controls the output end 6 of the actuator 5 of the centering structure to extend towards the ductile iron pipe 16, so as to drive the top block 7 to move forward until the top block 7 contacts the front limiting member 8. At this time, the ductile iron pipe 16 completes the centering process, and the control box 4 controls the output end 6 of the actuator 5 of the centering structure to retract until the top block 7 contacts the rear limiting member 9.

[0053] After that, the control box 4 controls the operation of the blocking and shifting assembly located between the centering structure and the first chamfering structure of the end face to drive the ductile iron pipe 16 to move from the first limit notch to the second limit notch and rest on the supporting roller 23. Subsequently, the control box 4 controls the driving machine 18 of the first chamfering structure of the end face to operate, causing its rotating shaft 19 to rotate, so as to drive the chamfering head 20 mounted on the rotating shaft 19 to rotate, and chamfer the outer surface of the socket of the ductile iron pipe 16. At the same time, the control box 4 controls the external cleaning structure of the socket to start working. After the traveling trolley moves towards the ductile iron pipe 16 to the target position, the driving structure 13 drives the cleaning member 14 to rotate, realizing the cleaning of the outer surface of the socket. After the cleaning is completed, the control box 4 controls the traveling trolley to return to its original position.

[0054] Then, the control box 4 controls the operation of the blocking and shifting assembly located between the first chamfering structure of the end face and the socket cleaning structure to drive the ductile iron pipe 16 to move from the second limit notch to the third limit notch and rest on the supporting roller 23. Subsequently, the control box 4 controls the driving machine 18 of the internal chamfering structure of the socket to operate, causing its rotating shaft 19 to rotate, so as to drive the chamfering head 20 mounted on the rotating shaft 19 to rotate, and chamfer the inner surface of the socket of the ductile iron pipe 16. At the same time, the control box 4 controls the socket cleaning structure to start working. After the traveling trolley moves towards the ductile iron pipe 16 to the target position, the driving structure 13 drives the cleaning member 14 to rotate, realizing the cleaning of the inner surface of the socket. After the cleaning is completed, the control box 4 controls the traveling trolley to return to its original position.

[0055] Finally, the control box 4 controls the operation of the blocking and shifting assembly located between the socket cleaning structure and the socket spraying structure to drive the ductile iron pipe 16 to move from the third limit notch to the fourth limit notch and rest on the supporting roller 23. Subsequently, the control box controls the socket spraying structure to start working and spray the socket of the ductile iron pipe 16. After the spraying is completed, the lifting platform 17 lifts the sprayed ductile iron pipe 16 so that the ductile iron pipe 16 can enter the packaging furnace.

[0056] Based on the above description of this specification, those skilled in the art can also understand the following terms used. For example, terms indicating orientation or positional relationship such as "upper", "lower", "front", "rear", "left", "right", "width", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings of this specification. They are only for the purpose of facilitating the description of the solution of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the devices or elements involved must have the specific orientation, be constructed and operate in the specific orientation. Therefore, the above terms of orientation or positional relationship cannot be understood or interpreted as a limitation to the solution of the present invention.

[0057] In addition, in the description of this specification, the meaning of "a plurality of" is at least two, such as two, three or more, etc., unless otherwise specifically and clearly defined.

Claims

1. An automatic grinding and cleaning device in front of a packaging furnace, characterized in that: It includes a first track and a second track arranged in parallel, and a track gap is formed between the first track and the second track; a centering structure, a first surface chamfering structure, a socket cleaning structure and a socket spraying structure are sequentially arranged on the outer side of the first track along the conveying direction of the ductile iron pipe; an outer socket cleaning structure opposite to the first surface chamfering structure and an inner socket chamfering structure opposite to the socket cleaning structure are arranged on the outer side of the second track; a pipe limiting structure is arranged above the centering structure, the first surface chamfering structure, the socket cleaning structure and the socket spraying structure, and a blocking assembly is arranged in the track gap between the centering structure and the first surface chamfering structure, between the first surface chamfering structure and the socket cleaning structure, and between the socket cleaning structure and the socket spraying structure; the centering structure, the first surface chamfering structure, the socket cleaning structure, the socket spraying structure, the socket outer cleaning structure, the socket cleaning structure, the pipe limiting structure and the blocking assembly are all connected to the control box signal.

2. The automatic grinding and cleaning device in front of the packaging furnace according to claim 1 is characterized in that: The tube limiting structure includes a position feedback sensor.

3. The automatic grinding and cleaning device in front of the packaging furnace according to claim 1 or 2, characterized in that: The centering structure comprises an actuator and a top block installed at the output end of the actuator, and a front stopper and a rear stopper are respectively arranged on the front side and the rear side of the ejection direction of the top block.

4. The automatic grinding and cleaning device in front of the packaging furnace according to claim 1 or 2, characterized in that: The shifting assembly includes an actuator, a transmission rod, a rotating rod and a shifting member. The actuator is rotatably mounted on the base, and its output end is hinged to one end of the transmission rod, and the other end of the transmission rod is fixedly connected to the rotating rod. The two ends of the rotating rod are respectively rotatably connected to the first track and the second track, and the shifting member is fixedly mounted on the rotating rod.

5. The automatic grinding and cleaning device in front of the packaging furnace according to claim 4 is characterized in that: The shifting member is a concave arc structure.

6. The automatic grinding and cleaning device in front of the packaging furnace according to claim 1 or 2, characterized in that: The socket cleaning assembly comprises a traveling trolley, a driving structure and a cleaning piece. The driving structure is mounted on the traveling trolley, and the cleaning piece is mounted at the output end of the driving structure. The driving structure is used to drive the cleaning piece to rotate.

7. The automatic grinding and cleaning device in front of the packaging furnace according to claim 1 or 2, characterized in that: The first track has a first limiting slot, a second limiting slot, a third limiting slot and a fourth limiting slot corresponding to the centering structure, the first surface chamfering structure, the socket cleaning structure and the socket spraying structure respectively, so as to accommodate the socket end of the ductile iron pipe; the second track has the same structural form as the first track.

8. The automatic grinding and cleaning device in front of the packaging furnace according to claim 7 is characterized in that: A V-shaped wheel is installed in the first limiting slot, and supporting wheels are installed in the second limiting slot, the third limiting slot and the fourth limiting slot.

9. The automatic grinding and cleaning device in front of the packaging furnace according to claim 7, characterized in that: The first track includes a plurality of sub-rails, and the first limiting slot, the second limiting slot, the third limiting slot and the fourth limiting slot are formed between two adjacent sub-rails.

10. The automatic grinding and cleaning device in front of the packaging furnace according to claim 1 or 2, characterized in that: A lifting platform corresponding to the position of the socket spraying structure is arranged in the rail gap.

Images