Middle shell pipe expanding method and equipment

Abstract

The invention discloses a middle shell pipe expanding method and equipment, and belongs to the technical field of metal pipe machining methods and equipment.The middle shell pipe expanding method comprises the following steps that S1, a pipe body is put into a mold to be limited and fixed, and an air cylinder drives the pipe body to fall down through a material supporting plate to be fed into the mold; s2, a hydraulic oil cylinder is started, the workpiece begins to be subjected to multi-size diameter changing according to the shape, the workpiece is deformed to be in the designated shape and kept at the set distance position for a certain time, and the product keeps stable multi-size diameter changing parameters; and S3, after the set time is up, the control system sends out a signal, and the hydraulic oil cylinder achieves stamping and chambering treatment on the center of the pipe body through the push rod. The technical problems that in the punching process of a pipe body, the inner diameter changes in the X-axis direction and the length of the inner diameter after changes in the Y-axis direction are often generated, equipment is adjusted and calibrated after a product is produced through an existing mechanism, however, the operation mode is complex in operation, and the working efficiency is reduced are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of metal tube processing methods and equipment, and specifically relates to a middle shell tube expansion method and equipment. Background Art

[0002] The pipe expander belongs to the straight seam metal welded pipe shaping equipment. It uses a cone expander to expand the steel pipe to eliminate the forming pressure and welding stress of the steel pipe and ensure that the true diameter of the straight seam welded steel pipe is consistent throughout the entire length. The equipment consists of a trolley, expander, working sleeve, fixed seat, oil cylinder, lubrication station, stand, hydraulic station, and electronic control system. The expander is set on the trolley, and the pipe expander is connected to the oil cylinder by a working sleeve. The pipe expander is composed of an expander, an expander block, a guide plate, a pull rod, etc. It is a large-scale equipment that ensures the sizing of the straight seam metal welded pipe shape and eliminates stress through a segmented mechanical expansion process.

[0003] The working principle of the pipe expander is to expand the inner diameter of the steel pipe by driving the wedge plate and the fan block through the hydraulic cylinder. When the hydraulic cylinder piston and the wedge plate move to the right, the fan block expands outward, thereby increasing the circumference of the mandrel and further expanding the inner diameter of the steel pipe. When the piston and the wedge plate move to the left, the circumference of the mandrel decreases, and the steel pipe is separated from the mandrel to allow for the next stage of expansion. The working process of the tube expander is essentially to expand the inner diameter of the tube by a one-step forming method through stamping. However, the stamping process of the tube often produces changes in the inner diameter in the X-axis direction and the length of the inner diameter after the change in the Y-axis direction. The existing mechanism cannot accurately measure and observe the above-mentioned two geometric tolerances. Generally, the equipment is adjusted and calibrated again after the product is produced. However, this operation method is complicated, reduces work efficiency, and is not conducive to improving the accuracy of product quality. Summary of the invention

[0004] The purpose of the present invention is to provide a method and equipment for expanding a tube in a shell, so as to solve the problem that the inner diameter in the X-axis direction and the length of the inner diameter after the change in the Y-axis direction often occur during the stamping process of the tube body, and the existing mechanism cannot perform accurate measurement and observation. Generally, the equipment is adjusted and calibrated again after the product is produced. However, this operation mode is complicated and reduces the technical problem of work efficiency.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A method for expanding a tube in a shell, comprising the following steps: S1. Put the tube into the mold and fix it in position. The cylinder drives the tube to drop into the mold through the supporting plate. S2. The hydraulic cylinder starts, and the workpiece begins to change diameter in multiple dimensions according to the shape, so that the workpiece is deformed to the specified shape. At the same time, the value set on the touch screen is kept at the set distance for a certain period of time, so that the product maintains the corresponding dimension change parameters; S3. When the set time is up, the control system sends a signal, and the hydraulic cylinder punches and expands the center of the pipe body through the push rod; S4, then the control system sends out a command, starts the cylinder and drives the workpiece to rise and push out through the supporting plate to complete the processed product.

[0006] A shell expansion device comprises: A base, wherein a hydraulic cylinder connected to a hydraulic station is provided on the base, and an electric control box on the base is electrically controlled and connected to the hydraulic station; A clamping adjustment mechanism, wherein the clamping adjustment mechanism includes cylinders arranged around the top of the base, the piston rods on the cylinders are fixedly connected to the support plate, a circular ring is fixedly installed at the center of the support plate, and an arc-shaped clamping plate is connected to the edge of the side wall of the circular ring in the length direction through a compression spring, the arc-shaped clamping plates are connected by arc-shaped telescopic rods, a clamping cavity connected to the mold is formed between the arc-shaped telescopic rods, and the circular ring and the support plate are connected by a locking and fixing method using a positioning pin; A shielding and protection mechanism, wherein the shielding and protection mechanism comprises a driving motor placed on a supporting plate, wherein an output shaft of the driving motor penetrates the supporting plate and extends to a central rotating tooth, wherein both ends of the central rotating tooth are meshed with first rotating teeth that rotate in the opposite direction, wherein a first rotating shaft and a second rotating shaft on the first rotating tooth are connected by a first conveyor belt transmission, wherein the second rotating shaft and a third rotating shaft are connected by a second conveyor belt transmission, wherein the first conveyor belt and the second conveyor belt are vertically arranged, and a top end of the third rotating shaft penetrates the supporting plate and extends to a shielding rod above the tube body; Among them, an active cavity connected to the first conveyor belt and the second conveyor belt is formed in the supporting plate. When the driving motor is started, the third rotating shaft drives the shielding rod and the top of the tube body to achieve mutual interference, fit or separation. The pushing rod at the top of the hydraulic cylinder is connected with a guide groove along the height direction of the inner wall of the base, and a conical part is connected to the annular edge of the top of the pushing rod, and a limit block that fits with the tube body is provided above the conical part, and a mold placed on the base is installed on the top of the limit block.

[0007] Furthermore, the outer wall of the mold is in contact with and fits the arc-shaped clamping plate, and an annular hole connected to the tube body is opened on the mold, the bottom of the annular hole passes through the limit block and extends into the guide groove, and the edge of the outer wall of the guide groove is provided with an expansion opening on the side wall of the base. As the hydraulic cylinder is started, the conical portion on the push rod is inserted inward into the tube opening of the tube body and extends toward the outer wall edge of the expansion opening.

[0008] Furthermore, it also includes a displacement metering mechanism, which includes a gear plate fixed on the push rod, the gear plate is connected to a guide wheel along the height direction of the side wall of the cover body, the outer wall of the gear plate is meshed with a second rotating tooth fixed on the fourth rotating shaft, the fourth rotating shaft and the fifth rotating shaft fixed on the first bevel gear are connected through a third conveyor belt transmission, and the second bevel gear and the third bevel gear are respectively meshed with the outer wall of the first bevel gear at both ends.

[0009] Furthermore, the centers of the outer walls of the second bevel gear and the third bevel gear are correspondingly connected to the X-axis screw shaft and the Y-axis screw shaft, and the X-axis screw shaft and the Y-axis screw shaft are correspondingly spirally driven with a first slider and a second slider, and one end of the first slider and the second slider are correspondingly connected to the X-axis marking rod and the Y-axis marking rod, and the X-axis marking rod and the Y-axis marking rod are movably and fittingly connected to the scale, and a camera compatible with it is connected to the scale, and the camera is electrically connected to a display placed on the electric control box.

[0010] Furthermore, the first slider and the second slider are connected with a slide groove along the length direction of the side plate, and the side plate is connected to the inner wall of the cover body in a detachable manner, one end of the X-axis screw shaft and the Y-axis screw shaft are provided with a rolling groove placed on the side wall of the cover body, and the outer wall of the first bevel gear is provided with a bearing placed on the inner wall of the cover body.

[0011] Furthermore, columns placed on the ground are installed around the bottom end of the base, and pads are installed at the bottom of the columns by welding.

[0012] Furthermore, a filter fan adapted thereto is installed on the outer wall of the electric control box, and a button device and a light tube group are respectively connected to the door frame of the electric control box.

[0013] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: (1) A clamping adjustment mechanism is provided. By providing an arc-shaped telescopic rod on the arc-shaped clamping plate and cooperating with the compression spring on the circular ring, the arc-shaped clamping plate can be telescoped and moved inward or outward at the same time, so that the arc-shaped clamping plate can adaptively clamp and fix molds of different sizes. In addition, the annular hole on the mold is conducive to placing the tube body. In combination with the hydraulic mechanism, it is convenient to perform stamping and expanding processing on the tube, thereby improving work efficiency.

[0014] (2) A shielding protection mechanism is provided. After the driving motor is started, it can drive the rotation of the central rotating gear, thereby driving the first rotating gears at both ends to rotate in the opposite direction. Under the transmission action of the conveyor belt, the shielding rod on the third rotating shaft can achieve resistance and limit the top of the tube body, thereby effectively limiting and fixing it. In conjunction with the mold on the outer wall of the tube body, the tube body can be effectively limited and fixed. At the same time, this transmission mechanism is provided at both ends of the support plate to avoid interference with the tube body and structural parts, thereby ensuring the stability of the normal operation of the equipment. At the same time, the shielding component is fixed by means of rotation positioning, which is simple to operate and has stable transmission, which is conducive to improving work efficiency.

[0015] (3) A displacement metering mechanism is provided. When the push rod on the hydraulic cylinder is performing stamping and forming work with the tube body, the push rod can simultaneously process the inner diameter of the tube mouth and the length of the inner diameter expansion. At this time, the movement of the push rod can drive the rotation of the second rotating tooth. Under the action of mechanical transmission, the first bevel gear and the second bevel gear can be driven to rotate, and then the X-axis screw shaft and the Y-axis screw shaft can be driven to rotate accordingly. Under the action of spiral transmission, the X-axis marking rod and the Y-axis marking rod can be moved accordingly on the scale. The movement distances of the X-axis marking rod and the Y-axis marking rod respectively correspond to the expansion distance of the inner diameter of the tube mouth and the height of the inner diameter after expansion. In this way, the data is transmitted to the display through the camera for real-time feedback, so as to facilitate the subsequent precise processing of the inner diameter expansion of the tube body, thereby improving the accuracy and product quality. In addition, the whole design is simple and reasonable, with strong integrated performance, which improves the application effect of the device.

[0016] (4) A method for expanding the tube in the middle shell is set up. Through the coordinated operation between the mold, the hydraulic cylinder and the hydraulic station connected to the electronic control box, the tube body can directly complete the integrated operation process of loading, stamping and unloading. The control accuracy is high, which is convenient for effectively expanding the inner diameter of the tube body and solving the problem of inconsistent product deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic flow chart of a method for expanding a tube in a shell according to the present invention; Figure 2 This is a schematic diagram of the structure of a tube expansion device in the shell of the present invention. Figure 1 ; Figure 3This is a schematic diagram of the structure of a tube expansion device in the shell of the present invention. Figure 2 ; Figure 4 It is a cross-sectional schematic diagram of the internal direction of a middle shell tube expansion device of the present invention; Figure 5 It is a schematic diagram of the connection between the circular ring and the arc-shaped splint of the present invention; Figure 6 It is a schematic diagram of the meshing transmission of the center rotating gear of the present invention; Figure 7 The present invention Figure 2 A magnified image of point A; Figure 8 It is a schematic diagram of the meshing transmission of the first bevel gear of the present invention.

[0019] Figure numerals: 1, base; 2, hydraulic station; 3, hydraulic cylinder; 4, electric control box; 5, clamping adjustment mechanism; 6, cylinder; 7, support plate; 8, ring; 9, compression spring; 10, arc clamp; 11, arc telescopic rod; 12, mold; 13, shielding protection mechanism; 14, driving motor; 15, center gear; 16, first gear; 17, first rotating shaft; 18, second rotating shaft; 19, first conveyor belt; 20, third rotating shaft; 21, second conveyor belt; 22, shielding rod; 23, pushing rod; 24, tapered part ; 25. Limit block; 26. Annular hole; 27. Expansion mouth; 28. Displacement metering mechanism; 29. ​​Gear plate; 30. Guide wheel; 31. Fourth rotating shaft; 32. Second rotating tooth; 33. First bevel gear; 34. Fifth rotating shaft; 35. Third conveyor belt; 36. Second bevel gear; 37. Third bevel gear; 38. X-axis lead screw shaft; 39. Y-axis lead screw shaft; 40. First slider; 41. Second slider; 42. X-axis marking rod; 43. Y-axis marking rod; 44. Scale; 45. Camera; 46. Tube body. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Reference Manual Attached Figure 1 and Figure 2 As shown, a middle shell tube expansion device comprises: A base 1 is provided with a hydraulic cylinder 3 connected to a hydraulic station 2, and an electric control box 4 on the base 1 is electrically controlled and connected to the hydraulic station 2; The clamping adjustment mechanism 5 includes a cylinder 6 arranged around the top of the base 1, and the piston rod on the cylinder 6 is fixedly connected to the supporting plate 7. A circular ring 8 is fixedly installed at the center of the supporting plate 7, and an arc-shaped clamping plate 10 is connected to the length direction of the side wall edge of the circular ring 8 through a compression spring 9. The arc-shaped clamping plates 10 are connected by an arc-shaped telescopic rod 11, and a clamping cavity connected to the mold 12 is formed between the arc-shaped telescopic rods 11. The circular ring 8 and the supporting plate 7 are connected by a locking and fixing method using a positioning pin.

[0022] Specifically, the specific working process of a shell expansion method is as follows: The tube body is placed in the mold 12 and fixed in position. The cylinder 6 drives the workpiece to drop into the mold 12 through the support plate 7. The hydraulic cylinder 3 is started, and the workpiece begins to change diameter in multiple sizes according to the shape, so that the workpiece is deformed to the specified shape. At the same time, the touch screen sets the value and keeps it at the set distance for a certain time to keep the product stable in multiple-size diameter parameters. When the time is up, the control system sends a signal, and the hydraulic cylinder 3 punches and expands the center of the tube body through the push rod 23. Then the control system sends a command, starts the cylinder 6, and drives the workpiece to rise and push out through the support plate 7 to complete the processing of the product.

[0023] In addition, the clamping adjustment mechanism 5 provided on the support plate 7 can limit and fix the outside of the mold 12 of different diameters, thereby facilitating the tube body to enter the mold 12, and the arc-shaped telescopic rod 11 on the arc-shaped clamping plate 10 can not only ensure the contact area with the tube body, but also adaptively adjust its diameter size, thereby performing clamping and fixing to different degrees.

[0024] A clamping adjustment mechanism 5 is provided. By providing an arc-shaped telescopic rod 11 on the arc-shaped clamping plate 10 and cooperating with the compression spring 9 on the ring 8, the arc-shaped clamping plate 10 can be telescopically moved inward or outward at the same time, so that the arc-shaped clamping plate 10 can adaptively clamp and fix molds 12 of different sizes. In addition, the annular hole 26 on the mold 12 is conducive to placing the tube body, and in conjunction with the hydraulic mechanism, it is convenient to perform stamping and expanding processing on it, thereby improving work efficiency.

[0025] refer to Figure 2 , Figure 3 , Figure 5 and Figure 6The shielding and protection mechanism 13 includes a driving motor 14 placed on the supporting plate 7, the output shaft of the driving motor 14 passes through the supporting plate 7 and extends to the central rotating gear 15, both ends of the central rotating gear 15 are meshed with a first rotating gear 16 that rotates in the opposite direction, the first rotating shaft 17 and the second rotating shaft 18 on the first rotating gear 16 are connected by a first conveyor belt 19, the second rotating shaft 18 and the third rotating shaft 20 are connected by a second conveyor belt 21, the first conveyor belt 19 and the second conveyor belt 21 are kept vertically arranged, and the top end of the third rotating shaft 20 passes through the supporting plate 7 and extends to the shielding rod 22 above the tube body; Among them, an active cavity connected to the first conveyor belt 19 and the second conveyor belt 21 is formed in the supporting plate 7. When the driving motor 14 is started, the third rotating shaft 20 drives the shielding rod 22 to contact or separate with the top of the tube body.

[0026] Specifically, the second rotating shaft 18 at both ends of the first rotating tooth 16 can, on the one hand, compensate for the transmission distance, and on the other hand, drive the second rotating shaft 18 at both ends to maintain reverse rotation at the same time. Compared with the existing clamping mechanism, the clamping mechanism generally needs to be set at the center of the equipment, and a central space for it to pass through needs to be provided. However, the central space of the present equipment is for placing the tube body. Therefore, the technical solution of the present invention performs structural design in a staggered manner, which can not only ensure the normal operation of the device and prevent interference between the transmission parts, but also fix the top of the tube body by means of rotation limiting, thereby facilitating effective stamping and forming work in the subsequent sequence.

[0027] A shielding and protection mechanism 13 is provided. After the driving motor 14 is started, it can drive the rotation of the central rotating gear 15, thereby driving the first rotating gears 16 at both ends to rotate synchronously in the opposite direction. Under the transmission action of the conveyor belt, the shielding rod 22 on the third rotating shaft 20 is allowed to achieve resistance and limit the top of the tube body, thereby effectively limiting and fixing it. In conjunction with the mold 12 on the outer wall of the tube body, an effective limiting and fixing effect can be achieved on the tube body. At the same time, this transmission mechanism is provided at both ends of the supporting plate 7 to avoid interference with the tube body and structural parts, thereby ensuring the stability of the normal operation of the equipment. At the same time, the shielding component is fixed by means of rotational positioning, which is simple to operate and has stable transmission, which is conducive to improving work efficiency.

[0028] refer to Figure 3 , Figure 4 and Figure 7 The push rod 23 at the top of the hydraulic cylinder 3 is connected with a guide groove along the height direction of the inner wall of the base 1, and a conical portion 24 is connected to the annular edge of the top of the push rod 23. A limit block 25 that fits the tube body is provided above the conical portion 24, and a mold 12 placed on the base 1 is installed on the top of the limit block 25.

[0029] The outer wall of the mold 12 is in contact with and fits with the arc-shaped clamping plate 10, and an annular hole 26 connected to the tube body is opened on the mold 12. The bottom of the annular hole 26 passes through the limit block 25 and extends into the guide groove, and the outer wall edge of the guide groove is provided with an expansion opening 27 placed on the side wall of the base 1. As the hydraulic cylinder 3 is started, the tapered portion 24 on the push rod 23 is inserted inwardly into the tube opening of the tube body and extends around the outer wall edge of the expansion opening 27.

[0030] Specifically, the tapered portion 24 on the push rod 23 is provided to facilitate insertion into the tube opening of the tube body. Then, during the movement of the push rod 23, the outer diameter of the push rod 23 increases, thereby effectively expanding the diameter of the tube body.

[0031] refer to Figure 3 and Figure 8 A method for expanding a tube in a middle shell also includes a displacement metering mechanism 28, which includes a gear plate 29 fixed on the push rod 23, the gear plate 29 is connected to a guide wheel 30 along the height direction of the side wall of the cover body, the outer wall of the gear plate 29 is meshed with a second rotating tooth 32 fixed on a fourth rotating shaft 31, the fourth rotating shaft 31 and a fifth rotating shaft 34 fixed on the first bevel gear 33 are connected by a third conveyor belt 35, and the outer walls of the first bevel gear 33 are respectively meshed with a second bevel gear 36 and a third bevel gear 37.

[0032] The centers of the outer walls of the second bevel gear 36 and the third bevel gear 37 are correspondingly connected to the X-axis screw shaft 38 and the Y-axis screw shaft 39. The X-axis screw shaft 38 and the Y-axis screw shaft 39 are correspondingly spirally driven with a first slider 40 and a second slider 41. One end of the first slider 40 and the second slider 41 are correspondingly connected to the X-axis marking rod 42 and the Y-axis marking rod 43. The X-axis marking rod 42 and the Y-axis marking rod 43 are movably fitted and connected to a scale 44, and a camera 45 compatible with it is connected to the scale 44. The camera 45 is electrically connected to a display placed on the electric control box 4.

[0033] Specifically, the push rod 23 can drive the gear plate 29 to move during its movement, and the guide wheel 30 on the outer wall of the gear plate 29 can realize the movement of the gear plate 29 by rolling friction, which can reduce the friction resistance of the transmission parts, reduce friction damage, and increase the service life of the device. At the same time, when the third conveyor belt 35 transmits power to the first bevel gear 33, it drives the X-axis screw shaft 38 and the Y-axis screw shaft 39 in the X-axis direction and the Y-axis direction to rotate, and then under the action of the spiral transmission, the camera 45 can record the precise movement distance of the marking rod, and can provide timely feedback on the display, so as to facilitate the subsequent personnel to make corrections.

[0034] A displacement metering mechanism 28 is provided. When the push rod 23 on the hydraulic cylinder 3 is performing stamping and forming work with the tube body, the push rod 23 can simultaneously process the inner diameter of the tube mouth and the length of the inner diameter expansion. At this time, the movement of the push rod 23 can drive the rotation of the second rotating tooth 32. Under the action of mechanical transmission, the first bevel gear 33 and the second bevel gear 36 can be driven to rotate, and then the X-axis lead screw shaft 38 and the Y-axis lead screw shaft 39 are driven to rotate accordingly. Under the action of spiral transmission, the X-axis marking rod 42 and the Y-axis marking rod 43 can be moved accordingly on the scale 44, and the moving distances of the X-axis marking rod 42 and the Y-axis marking rod 43 respectively correspond to the expansion distance of the inner diameter of the tube mouth and the height of the inner diameter after the expansion of the tube mouth. In this way, the data is transmitted to the display through the camera 45 for real-time feedback, so as to facilitate the subsequent precise processing of the inner diameter expansion of the tube body, thereby improving the accuracy and product quality. In addition, the whole design is simple and reasonable, with strong integration performance, which improves the application effect of the device.

[0035] In addition, the side panels connected to the first slider 40 and the second slider 41 can provide a movable space for the movement of the first slider 40 and the second slider 41 to prevent position deviation during movement, and the side panels are connected to the cover body in a detachable installation manner, so that even if the side panels are damaged in time, they can be quickly installed and repaired, which is convenient for replacement and beneficial for personnel operation.

[0036] The first slider 40 and the second slider 41 are connected with a slide groove along the length direction of the side plate, and the side plate is connected to the inner wall of the cover body in a detachable manner. One end of the X-axis screw shaft 38 and the Y-axis screw shaft 39 are provided with a rolling groove placed on the side wall of the cover body, and the outer wall of the first bevel gear 33 is provided with a bearing placed on the inner wall of the cover body. The bottom of the base 1 is equipped with columns placed on the ground, and the bottom of the columns is fixed with pads by welding. A filter fan adapted to it is installed on the outer wall of the electric control box 4, and the door frame of the electric control box 4 is respectively connected with a button and a lamp group.

[0037] A method for expanding the tube in the middle shell is set up. Through the coordinated operation among the mold 12, the hydraulic cylinder 3 and the hydraulic station 2 connected to the control of the electric control box 4, the tube body can directly complete the integrated operation process of loading, stamping and unloading. The control accuracy is high, which is convenient for effectively expanding the inner diameter of the tube body and solves the problem of inconsistent product deformation.

[0038] The push rod 23 serves as a hydraulic push component of the hydraulic cylinder 3. When the push rod 23 contacts and fits on the tube body and performs vertical stamping, the moving distance of the gear plate 29 means the height distance of the tube body 46 after expansion. However, the present invention converts the vertical movement of the gear plate 29 into the rotational movement of the first bevel gear 33 through the design of the mechanical transmission ratio, and converts the rotational movement into horizontal and vertical forces under the action of the gear meshing transmission and the spiral transmission. The horizontal force cooperates with the scale 44 to represent the diameter increase distance of the tube body 46 after expansion, and the vertical force cooperates with the scale 44 to represent the height distance of the tube body 46 after expansion. The transmission ratio of the first bevel gear 33 and the second bevel gear 36 is 3:1, and the transmission ratio between the first bevel gear 33 and the third bevel gear 37 is 1:1, which means that when the push rod 23 moves upward by 3 cm, the height distance of the tube body 46 after expansion is also 3 cm, and the diameter of the tube body 46 after expansion increases by 1 cm. Of course, the transmission ratio can be adaptively changed according to actual needs.

[0039] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0040] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A method for expanding a tube in a shell, characterized in that: The steps include: S1, placing the tube body into the mold (12) and fixing it in a limited position, and the cylinder (6) drives the tube body to drop into the mold (12) through the supporting plate (7); S2, the hydraulic cylinder (3) is started, and the workpiece begins to change diameter in multiple dimensions according to the shape, so that the workpiece is deformed to a specified shape, and at the same time, the value set on the touch screen is maintained at the set distance position for a certain period of time, so that the product maintains the corresponding dimension change parameters; S3, when the set time is up, the control system sends a signal, and the hydraulic cylinder (3) performs punching and expanding processing on the center of the pipe body through the push rod (23); S4, the control system then issues a command to start the cylinder (6), which drives the workpiece to rise and push it out through the support plate (7) to complete the processing of the product.

2. A tube expansion device for a shell, applied to a tube expansion method for a shell according to claim 1, characterized in that: include: A base (1), wherein a hydraulic cylinder (3) connected to a hydraulic station (2) is provided on the base (1), and an electric control box (4) on the base (1) is electrically controlled and connected to the hydraulic station (2); A clamping adjustment mechanism (5), the clamping adjustment mechanism (5) comprising cylinders (6) arranged around the top of the base (1), the piston rods on the cylinders (6) being fixedly connected to the support plate (7), a circular ring (8) being fixedly installed at the center of the support plate (7), and an arc-shaped clamping plate (10) being connected to the length direction of the side wall edge of the circular ring (8) via a compression spring (9), the arc-shaped clamping plates (10) being connected to each other via an arc-shaped telescopic rod (11), a clamping cavity connected to the mold (12) being formed between the arc-shaped telescopic rods (11), and the circular ring (8) and the support plate (7) being connected to each other via a locking and fixing method using a positioning pin; A shielding and protection mechanism (13), the shielding and protection mechanism (13) comprising a driving motor (14) placed on a supporting plate (7), the output shaft of the driving motor (14) passing through the supporting plate (7) and extending to a central rotating tooth (15), both ends of the central rotating tooth (15) being meshed with a first rotating tooth (16) rotating in the opposite direction, the first rotating shaft (17) and the second rotating shaft (18) on the first rotating tooth (16) being connected by a first conveyor belt (19), the second rotating shaft (18) and the third rotating shaft (20) being connected by a second conveyor belt (21), the first conveyor belt (19) and the second conveyor belt (21) being arranged vertically, and the top end of the third rotating shaft (20) passing through the supporting plate (7) and extending to a shielding rod (22) above the tube body; The support plate (7) has an active cavity connected to the first conveyor belt (19) and the second conveyor belt (21). When the driving motor (14) is started, the third rotating shaft (20) drives the shielding rod (22) to contact or separate the top of the tube body. The push rod (23) at the top of the hydraulic cylinder (3) is connected to a guide groove along the height direction of the inner wall of the base (1), and a conical portion (24) is connected to the annular edge of the top of the push rod (23). A limit block (25) that fits the tube body is provided above the conical portion (24), and a mold (12) placed on the base (1) is installed on the top of the limit block (25).

3. The middle shell tube expansion equipment according to claim 2, characterized in that: The outer wall of the mold (12) is in contact with and fits with the arc-shaped clamping plate (10), and an annular hole (26) connected to the tube body is opened on the mold (12), the bottom of the annular hole (26) passes through the limit block (25) and extends into the guide groove, and the outer wall edge of the guide groove is provided with an expansion opening (27) disposed on the side wall of the base (1), and as the hydraulic cylinder (3) is started, the conical portion (24) on the push rod (23) is inserted inwardly into the tube opening of the tube body and extends around the outer wall edge of the expansion opening (27).

4. The middle shell tube expansion equipment according to claim 2, characterized in that: The housing also comprises a displacement metering mechanism (28), the displacement metering mechanism (28) comprising a gear plate (29) fixed on the push rod (23), the gear plate (29) being connected to a guide wheel (30) along the height direction of the cover body side wall, the outer wall of the gear plate (29) being meshed with a second rotating tooth (32) fixed on a fourth rotating shaft (31), the fourth rotating shaft (31) and a fifth rotating shaft (34) fixed on the first bevel gear (33) being connected in transmission via a third conveyor belt (35), and the outer wall of the first bevel gear (33) being meshed with a second bevel gear (36) and a third bevel gear (37) at two ends thereof.

5. The middle shell tube expansion equipment according to claim 4, characterized in that: The centers of the outer walls of the second bevel gear (36) and the third bevel gear (37) are connected to an X-axis screw shaft (38) and a Y-axis screw shaft (39) respectively; the X-axis screw shaft (38) and the Y-axis screw shaft (39) are provided with a first slider (40) and a second slider (41) for corresponding spiral transmission; one end of the first slider (40) and the second slider (41) are connected to an X-axis marking rod (42) and a Y-axis marking rod (43) respectively; the X-axis marking rod (42) and the Y-axis marking rod (43) are movably connected to a scale (44); and a camera (45) adapted thereto is connected to the scale (44); the camera (45) is electrically connected to a display disposed on the electric control box (4).

6. The middle shell tube expansion equipment according to claim 5, characterized in that: The first slider (40) and the second slider (41) are connected with a slide groove along the length direction of the side plate, and the side plate is connected to the inner wall of the cover body in a detachable installation manner. One end of the X-axis screw shaft (38) and the Y-axis screw shaft (39) are both provided with a rolling groove disposed on the side wall of the cover body, and the outer wall of the first bevel gear (33) is provided with a bearing disposed on the inner wall of the cover body.

7. The middle shell tube expansion equipment according to claim 2, characterized in that: The bottom of the base (1) is provided with upright posts placed on the ground, and cushion blocks are installed at the bottom of the upright posts by welding.

8. The middle shell tube expansion equipment according to claim 2, characterized in that: A filter fan adapted to the electric control box (4) is installed on the outer wall thereof, and a button device and a light tube group are respectively connected to the door frame of the electric control box (4).

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