Steel pipe necking device and method

Abstract

The application relates to the technical field of steel pipe processing, and discloses a steel pipe necking processing device and a processing method, wherein the steel pipe necking processing device comprises a rack, a blanking box, a plurality of limiting support frames, a material replacing mechanism, a hydraulic cylinder one and a necking mechanism; an extrusion type oil injection mechanism connected at the opening end of the necking mechanism, which comprises a double-end one-way oil supply assembly, a telescopic oil storage assembly one, a telescopic oil storage assembly two, a one-way oil injection assembly one and a one-way oil injection assembly two; an incremental damping mechanism detachably connected to the rack, which comprises a vertical elastic connection assembly and an arc-shaped damping plate; during the movement of the necking mechanism towards the steel pipe to be necked, the incremental damping mechanism applies an incremental friction force to the extrusion type oil injection mechanism, so that the oil injection port of the extrusion type oil injection mechanism uniformly sprays lubricating oil when passing through the necking area of the steel pipe, and the lubricating oil is automatically supplemented through internal negative pressure during resetting, so that the economic benefit is high and the service life of the equipment can be prolonged.

Description

Technical Field

[0001] This invention relates to the field of steel pipe processing technology, and more specifically, to a steel pipe necking processing device and processing method. Background Technology

[0002] The necking die used in steel pipe necking is a special stamping die used in the field of mechanical engineering for radial shrinkage of the open end of tubular or cylindrical parts. Its core process is to induce axial shrinkage deformation of the material through compressive stress.

[0003] This process requires controlling the necking coefficient to prevent instability and wrinkling. Different precision requirements can be achieved by using structures such as external support fixed type and internal and external support composite type.

[0004] Currently, in the common steel pipe necking process, the necking equipment used involves manual application of lubricating oil to reduce wear on the pipe end and necking die during stamping. However, this method suffers from disadvantages such as short application intervals, uneven application, and high labor costs. On the other hand, the equipment design, manufacturing, and operating costs are high, which affects economic efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a steel pipe necking processing device and processing method to solve the above-mentioned problems.

[0006] This invention provides a steel pipe necking processing device, comprising: The frame is fixedly mounted with a feeding box, several limiting support frames, a material changing mechanism, and two sets of symmetrically arranged hydraulic cylinders. The output end of the hydraulic cylinder is fixedly connected to a necking mechanism. The output end of the feeding box is configured to cooperate with the limiting support frames. The material changing mechanism is used to push the steel pipe on the limiting support frames away while pushing the steel pipe at the output end of the feeding box onto the limiting support frames. A compression-type oil injection mechanism is connected to the open end of the constriction mechanism. The compression-type oil injection mechanism includes a double-ended unidirectional oil supply assembly, a telescopic oil storage assembly 1 and a telescopic oil storage assembly 2 connected to both ends of the double-ended unidirectional oil supply assembly, a unidirectional oil injection assembly 1 located at the other end of the telescopic oil storage assembly 1, and a unidirectional oil injection assembly 2 located at the other end of the telescopic oil storage assembly 2. The other end of the telescopic oil storage assembly 1 is fixedly connected to the open end of the constriction mechanism. A damping layer is provided on the outer wall of the other end of the telescopic oil storage assembly 2. When the telescopic oil storage assembly 1 and the telescopic oil storage assembly 2 are in a compressed state, the unidirectional oil injection assembly 1 and the unidirectional oil injection assembly 2 are respectively used to spray lubricating oil into the interior of the constriction mechanism and onto the surface of the steel pipe. A detachable incremental damping mechanism connected to a frame, the incremental damping mechanism including a vertical elastic connection component and an arc-shaped damping plate connected to the vertical elastic connection component, the arc-shaped damping plate being configured to cooperate with the damping layer, and the damping coefficient of the arc-shaped damping plate gradually increasing from one end flush with the end of the steel pipe to the other end.

[0007] As a further optimization of the present invention, the dual-end unidirectional oil supply assembly includes a ring body two, an annular groove three and an annular groove four disposed on both ends of the ring body two, an annular sealing plate three disposed at the opening of the annular groove three, a plurality of telescopic rods one connected between the annular sealing plate three and the inner wall of the annular groove three, an annular sealing plate four disposed at the opening of the annular groove four, a plurality of telescopic rods two connected between the annular sealing plate four and the inner wall of the annular groove four, and a plurality of oil guide pipes connected to the ring body two. The internal spaces of the annular groove three and the annular groove four are both connected to the output end of the oil guide pipes. The annular sealing plate three is located outside the annular groove three, and the annular sealing plate four is located outside the annular groove four.

[0008] As a further optimization of the present invention, the telescopic oil storage assembly includes a ring body, a bellows tube 1 and a bellows tube 2 connected to one end of the ring body, the other ends of the bellows tube 1 and the bellows tube 2 are fixedly connected to the ring body 2, and a sealed oil storage chamber 1 is formed between the ring body 1, the ring body 2, the bellows tube 1 and the bellows tube 2, and the other end of the ring body 1 is fixedly connected to the open end of the constriction mechanism.

[0009] As a further optimization of the present invention, the one-way oil injection assembly includes an annular groove on one end face of the ring body, an annular sealing plate in the annular groove, a spring connecting the annular sealing plate and the inner wall of the annular groove, a plurality of through holes and spray holes in the interior of the ring body, wherein the spray holes are connected to the annular groove through the through holes, and the output ends of the plurality of spray holes are arranged in the direction of facing the interior of the constriction mechanism.

[0010] As a further optimization of the present invention, the telescopic oil storage assembly II includes a ring body III, a bellows III and a bellows IV connected to the ring body III, the other ends of the bellows III and the bellows IV are fixedly connected to the ring body II, and a sealed oil storage chamber II is formed between the ring body III, the ring body II, the bellows III and the bellows IV, and a damping layer is provided on the ring body III.

[0011] As a further optimization of the present invention, the one-way oil injection assembly includes an annular groove 2 disposed on one end face of the ring body 3, an annular sealing plate 2 disposed in the annular groove 2, a spring 2 connected between the inner wall of the annular groove 2 and the annular sealing plate 2, and a plurality of spray holes 2 disposed inside the ring body 3. The plurality of spray holes 2 are all in communication with the internal space of the annular groove 2, and the plurality of spray holes 2 are all arranged along the radial direction of the ring body 3.

[0012] As a further optimization of the present invention, the vertical elastic connection assembly includes a second mounting plate detachably connected to the frame, a third telescopic rod fixedly connected to the bottom of the second mounting plate, and a connector fixedly connected to the bottom of the third telescopic rod. The arc-shaped damping plate is fixedly connected to the connector, and the arc-shaped damping plate is located directly above the steel pipe to be narrowed.

[0013] As a further optimization of the present invention, the necking mechanism includes a necking pressure head and a shaft core fixedly connected to the output end of a hydraulic cylinder, a necking stamping chamber is formed between the necking pressure head and the shaft core, and the spray holes are arranged facing the area of ​​the shaft core close to the hydraulic cylinder.

[0014] As a further optimization of the present invention, the limiting support frame is provided with two sets of wedge-shaped parts, and the middle area of ​​the two sets of wedge-shaped parts is used to limit and support the steel pipe to be narrowed. The material changing mechanism includes a mounting frame fixedly connected to the frame, a mounting plate I connected to the mounting frame, a hydraulic cylinder II connected to the output end of the mounting plate I, and several top plates fixedly connected to the hydraulic cylinder II. The top plates are provided with two sets of wedge-shaped parts II, which are staggered with the wedge-shaped parts I.

[0015] A method for processing steel pipe necking, using the steel pipe necking processing device described above, includes the following steps: Step 100: Drive the necking mechanism and the extrusion-type oil injection mechanism connected to the necking mechanism simultaneously towards the steel pipe to be necked located on the limit support frame by the hydraulic cylinder. Step 200: When the damping layer on the other end of the telescopic oil storage component 2 contacts the arc-shaped damping plate, a set value of damping is generated. Both the telescopic oil storage component 2 and the telescopic oil storage component 1 are compressed due to the resistance. During the compression process, the lubricating oil in the telescopic oil storage component 1 and the telescopic oil storage component 2 is sprayed out from the one-way oil spraying component 1 and the one-way oil spraying component 2, respectively. When the telescopic oil storage component 1 is compressed to the shortest state, the oil spraying process inside the shrinking mechanism ends. The telescopic oil storage component 2 is still in the moving process until it is compressed to the shortest state, at which point the oil spraying process in the shrinking area of ​​the shrinking steel pipe end ends. Step 300: The hydraulic cylinder continuously drives the shrinking mechanism to move toward the steel pipe to be shrunk on the limit support frame until the end of the steel pipe to be shrunk is punched and shrunken. Step 400: Control the hydraulic cylinder to move back, and the telescopic oil storage component 1 and the telescopic oil storage component to reset from the compressed state to the initial state. During the reset process, lubricating oil is pumped in from the double-end unidirectional oil supply component through internal negative pressure. Step 500: Push the narrowed steel pipe located on the limiting support frame away through the material changing mechanism and push the steel pipe to be narrowed between the feeding box and the limiting support frame onto the limiting support frame. Step 600, repeat steps 100 to 500.

[0016] The beneficial effects of this invention are as follows: This invention adds a compression-type oil spraying mechanism and a progressive damping mechanism before the stamping process. During the movement of the necking mechanism toward the steel pipe to be necked, the progressive damping mechanism applies increasing frictional force to the compression-type oil spraying mechanism, causing the oil nozzle of the compression-type oil spraying mechanism to uniformly spray lubricating oil when passing through the necking area of ​​the steel pipe. During resetting, the lubricating oil is automatically replenished by internal negative pressure, eliminating the need for an external hydraulic pumping mechanism. This achieves uniform oil spraying without additional energy consumption, resulting in lower costs, higher economic benefits, and effectively improving the service life of the equipment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is the invention Figure 1 An enlarged view of point A in the image; Figure 3 This is a view showing the cooperation between the extrusion-type oil injection mechanism and the nozzle-reduction mechanism of the present invention; Figure 4 This is the invention Figure 3 An enlarged view of point B in the image; Figure 5 This is the invention Figure 3 A magnified view of point C in the image; Figure 6 This is the invention Figure 3 A magnified view of point D in the image.

[0018] In the diagram: 1. Frame; 2. Feed box; 3. Hydraulic cylinder one; 4. Narrowing mechanism; 401. Narrowing pressure head; 402. Shaft core; 5. Limiting support frame; 501. Wedge part one; 6. Material changing mechanism; 601. Mounting frame; 602. Mounting plate one; 603. Hydraulic cylinder two; 604. Top plate; 605. Wedge part two; 7. Extrusion-type oil spraying mechanism; 701. Ring one; 702. Ring two; 703. Ring three; 704. Bellows one; 705. Bellows two; 706. Bellows three; 707. Bellows four; 708. 709. Annular groove 1; 710. Through hole 1; 711. Spray hole 1; 712. Annular groove 2; 713. Spray hole 2; 714. Annular sealing plate 1; 715. Annular sealing plate 2; 716. Spring 2; 717. Annular groove 3; 718. Annular groove 4; 719. Annular sealing plate 3; 720. Telescopic rod 1; 721. Annular sealing plate 4; 722. Telescopic rod 2; 723. Oil guide pipe; 8. Increasing damping mechanism; 801. Mounting plate 2; 802. Telescopic rod 3; 803. Connector; 804. Arc-shaped damping plate. Detailed Implementation

[0019] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed merely to enable those skilled in the art to better understand and implement the subject matter described herein. Furthermore, features described in some examples may be combined in other examples.

[0020] like Figures 1 to 6 As shown, a steel pipe necking processing device includes: The frame 1 is fixedly installed with a feeding box 2, several limiting support frames 5, a material changing mechanism 6, and two sets of symmetrically arranged hydraulic cylinders 3. The output end of the hydraulic cylinders 3 is fixedly connected to a necking mechanism 4. The output end of the feeding box 2 is configured to cooperate with the limiting support frame 5. The material changing mechanism 6 is used to push the steel pipe on the limiting support frame 5 away while pushing the steel pipe at the output end of the feeding box 2 onto the limiting support frame 5. The extrusion-type oil injection mechanism 7 is connected to the open end of the constriction mechanism 4. The extrusion-type oil injection mechanism 7 includes a double-ended unidirectional oil supply component, a telescopic oil storage component 1 and a telescopic oil storage component 2 connected to both ends of the double-ended unidirectional oil supply component, a unidirectional oil injection component 1 located at the other end of the telescopic oil storage component 1, and a unidirectional oil injection component 2 located at the other end of the telescopic oil storage component 2. The other end of the telescopic oil storage component 1 is fixedly connected to the open end of the constriction mechanism 4. A damping layer is provided on the outer wall of the other end of the telescopic oil storage component 2. When the telescopic oil storage component 1 and the telescopic oil storage component 2 are in a compressed state, the unidirectional oil injection component 1 and the unidirectional oil injection component 2 are respectively used to spray lubricating oil into the interior of the constriction mechanism 4 and the surface of the steel pipe. The incremental damping mechanism 8 is detachably connected to the frame 1. The incremental damping mechanism 8 includes a vertical elastic connection component and an arc-shaped damping plate 804 connected to the vertical elastic connection component. The arc-shaped damping plate 804 is configured to cooperate with the damping layer, and the damping coefficient of the arc-shaped damping plate 804 gradually increases from one end flush with the end of the steel pipe to the other end.

[0021] It should be noted that when using the steel pipe necking processing device described above to neck both ends of the steel pipe, the following steps are included: Step 1: Drive the necking mechanism 4 and the extrusion-type oil injection mechanism 7 connected to the necking mechanism 4 to move synchronously toward the steel pipe to be necked located on the limit support frame 5 through the hydraulic cylinder 3. Step 2: When the damping layer on the other end of the telescopic oil storage component 2 comes into contact with the arc-shaped damping plate 804, a set damping value is generated. Both the telescopic oil storage component 2 and the telescopic oil storage component 1 are compressed due to the resistance. During the compression process, the lubricating oil in the telescopic oil storage component 1 and the telescopic oil storage component 2 is sprayed out from the one-way oil spraying component 1 and the one-way oil spraying component 2, respectively. Since the length of the telescopic oil storage component 1 is less than the length of the telescopic oil storage component 2, as the telescopic oil storage component 1 is compressed to its shortest state, after the oil spraying process towards the inside of the constriction mechanism 4 ends, the telescopic oil storage component 2 is still in the process of moving and compressing. During the movement, the damping value increases, thereby realizing the continuous compression of the telescopic oil storage component 2 during the movement, so that the lubricating oil inside it can be sprayed out under continuous pressure until it is compressed to its shortest state, and the oil spraying process in the constriction area of ​​the constriction steel pipe end ends. Step 3: The hydraulic cylinder 3 continuously drives the narrowing mechanism 4 to move toward the steel pipe to be narrowed on the limiting support frame 5 until the end of the steel pipe to be narrowed is punched and narrowed. Step 4: Control the hydraulic cylinder 1 to move back, and the telescopic oil storage component 1 and the telescopic oil storage component will be reset from the compressed state to the initial state. During the reset process, lubricating oil will be pumped in from the double-end unidirectional oil supply component through the internal negative pressure. Step 5: Push the narrowed steel pipe on the limiting support frame 5 away through the material changing mechanism 6, and push the steel pipe to be narrowed between the feeding box 2 and the limiting support frame 5 onto the limiting support frame 5. Step 6: Repeat steps 1 to 5 to achieve the end reduction treatment of the new steel pipe. Before reduction, apply lubricating oil evenly to the inside of the reduction mechanism 4 and the area to be reduced at both ends of the steel pipe. Compared with manual application or external hydraulic power spraying, this method is cheaper, consumes less energy, and has higher efficiency.

[0022] In an optional embodiment of the invention, such as Figures 3 to 6 As shown, the dual-end unidirectional oil supply assembly includes a second ring body 702, annular grooves 717 and 718 on both ends of the second ring body 702, annular sealing plate 719 at the opening of annular groove 717, several telescopic rods 720 connected between the inner walls of annular sealing plate 719 and annular groove 717, annular sealing plate 721 at the opening of annular groove 718, several telescopic rods 722 connected between annular sealing plate 721 and annular groove 718, and several oil guide pipes 723 connected to the second ring body 702. The internal spaces of annular groove 717 and annular groove 718 are connected to the output end of oil guide pipes 723. Annular sealing plate 719 is located outside annular groove 717, and annular sealing plate 721 is located outside annular groove 718.

[0023] The telescopic oil storage assembly includes a ring body 701, a bellows 704 and a second bellows 705 connected to one end of the ring body 701. The other ends of the bellows 704 and the second bellows 705 are fixedly connected to the ring body 702. A sealed oil storage chamber is formed between the ring body 701, the ring body 702, the bellows 704 and the second bellows 705. The other end of the ring body 701 is fixedly connected to the open end of the constriction mechanism 4.

[0024] The one-way oil injection assembly includes an annular groove 708 on one end face of an annular body 701, an annular sealing plate 713 in the annular groove 708, a spring 714 connecting the annular sealing plate 713 and the inner wall of the annular groove 708, a plurality of through holes 709 and spray holes 710 in the annular body 701. The spray holes 710 are connected to the annular groove 708 through the through holes 709. The output ends of the plurality of spray holes 710 are arranged in the direction of facing the interior of the constriction mechanism 4.

[0025] The telescopic oil storage assembly II includes a ring body 3 703, a bellows 3 706 and a bellows 4 707 connected to the ring body 3 703. The other ends of the bellows 3 706 and the bellows 4 707 are fixedly connected to the ring body II 702. A sealed oil storage chamber II is formed between the ring body 3 703, the ring body II 702, the bellows 3 706 and the bellows 4 707. A damping layer is provided on the ring body 3 703.

[0026] The one-way oil injection assembly includes an annular groove 711 on one end face of the ring body 703, an annular sealing plate 715 inside the annular groove 711, a spring 716 connecting the inner wall of the annular groove 711 and the annular sealing plate 715, and a plurality of spray holes 712 inside the ring body 703. The plurality of spray holes 712 are all connected to the internal space of the annular groove 711, and the plurality of spray holes 712 are arranged radially along the ring body 703.

[0027] It should be noted that, as described above, when the reducing mechanism 4 moves towards the end of the steel pipe to be reduced, the annular body 703 with the damping layer will contact the arc-shaped damping plate 804 and generate corresponding frictional resistance. As the reducing mechanism 4 continues to move, the elasticity of the bellows 704, bellows 705, bellows 706, and bellows 707 themselves, as well as the hydraulic pressure of the lubricating oil in the sealed oil storage chambers 1 and 2, can transmit the thrust of the reducing mechanism 4 and overcome the frictional force generated between the damping layer and the arc-shaped damping plate 804. The magnitude of the transmitted thrust is determined by the elasticity of the bellows 704, bellows 705, bellows 706, and bellows 707 themselves, as well as the hydraulic pressure of the lubricating oil in the sealed oil storage chambers 1 and 2. The change in hydraulic pressure of the lubricating oil in chamber two determines the force transmission effect. When the bellows 704, 705, 706, and 707, as well as the spaces within sealed oil reservoirs one and two, are compressed, a greater force transmission effect is generated. Therefore, under the gradually increasing friction coefficient adjustment of the arc-shaped damping plate 804, the ring 703, during its movement, will be accompanied by the continuous compression of the bellows 704, 705, 706, and 707, as well as the compression of the spaces within sealed oil reservoirs one and two. This causes the hydraulic oil in sealed oil reservoirs one and two to be continuously pumped out, while the lubricating oil in sealed oil reservoir one... The oil, under pressure, moves towards the annular sealing plate 713. The annular sealing plate 713, under pressure, moves towards the inside of the annular groove 708 and compresses the spring 714. Meanwhile, the annular sealing plate 719 tightly seals the annular groove 717. At this time, the lubricating oil in the first sealed oil storage chamber can only flow to the through hole 709 and the spray hole 710, and under pressure, it is sprayed out from the spray hole 710 and sprayed into the designated area inside the constriction mechanism 4. Similarly, the lubricating oil in the second sealed oil storage chamber pushes the annular sealing plate 715 into the annular groove 711, and the spring 716 is compressed. The lubricating oil can only be sprayed from the spray hole 712 into the area on the outer surface of the steel pipe through which the annular body 703 passes, i.e., the constriction stamping area. The annular sealing plate 721, under hydraulic pressure, tightly seals the sealing groove 718. The oil spraying process of the ring body 703 continues until the sealed oil storage chamber 2 is compressed to its shortest state. Subsequently, the steel pipe begins to enter the necking mechanism 4 and is stamped. The lubricating oil sprayed on the outer wall of the steel pipe can effectively lubricate the stamping process. The lubricating oil sprayed in the designated area of ​​the necking mechanism 4 can prevent the steel pipe from generating large frictional forces with the shaft core 402 in the necking mechanism 4 after necking, ensuring that the necking mechanism 4 can stably disengage from the steel pipe. After the necking is completed, the necking mechanism 4 begins to move back, and the internal spaces of the sealed oil storage chamber 1 and the sealed oil storage chamber 2 begin to recover. The recovery force is mostly provided by the reverse frictional force of the arc-shaped damping plate 804.A small portion is provided by the self-elasticity of bellows 704, 705, 706, and 707. When the space increases, negative pressure is generated. When the negative pressure acts on annular sealing plates 713 and 715, it allows annular sealing plates 713 and 715 to tightly seal annular grooves 708 and 711, respectively. Meanwhile, annular sealing plates 719 and 721 are subjected to forces that seal the oil storage chambers 1 and 721, respectively. The movement within the sealed oil reservoir chamber two allows for continuous negative pressure pumping of lubricating oil from annular grooves three (717) and four (718) into sealed oil reservoir chambers one and two. The oil guide pipe 723 continuously supplies lubricating oil to annular grooves three (717) and four (718). Neither the oil injection nor the lubricating oil replenishment process requires an external hydraulic pump. The entire process is highly integrated with the stamping process, resulting in high equipment integration, low equipment cost, and low operating energy consumption, effectively extending equipment lifespan and increasing economic benefits.

[0028] In an optional embodiment of the invention, such as Figure 1 and Figure 2 As shown, the vertical elastic connection assembly includes a mounting plate 801 detachably connected to the frame 1, a telescopic rod 802 fixedly connected to the bottom of the mounting plate 801, and a connector 803 fixedly connected to the bottom of the telescopic rod 802. An arc-shaped damping plate 804 is fixedly connected to the connector 803, and the arc-shaped damping plate 804 is located directly above the steel pipe to be narrowed.

[0029] The limiting support frame 5 is provided with two sets of wedge-shaped parts 501, and the middle area of ​​the two sets of wedge-shaped parts 501 is used to limit and support the steel pipe to be narrowed. The material changing mechanism 6 includes a mounting frame 601 fixedly connected to the frame 1, a mounting plate 602 connected to the mounting frame 601, a hydraulic cylinder 603 connected to the output end of the mounting plate 602, and several top plates 604 fixedly connected to the hydraulic cylinder 603. The top plates 604 are provided with two sets of wedge-shaped parts 605, which are staggered with the wedge-shaped parts 601.

[0030] It should be noted that during the movement of the ring body 703, only horizontal friction is generated on the arc-shaped damping plate 804, which does not affect the extension and retraction of the telescopic rod 802. However, when the steel pipe is replaced, the mounting plate 602 drives the hydraulic cylinder 603 to move upward, and in turn, the top plate 604 moves upward. During the upward movement of the top plate 604, the wedge surface area of ​​the wedge-shaped part 605 on it will simultaneously lift the constricted steel pipe located in the area between the wedge-shaped parts 501 and, under the action of oblique friction, cause it to... The steel pipe is moved to the wedge surface of the wedge-shaped part 501, allowing it to directly detach from the workstation. The steel pipe located between the unloading box 2 and the limiting support frame 5 is pushed to the area between the two wedge-shaped parts 501 for limiting support. During this process, the narrowed area of ​​the steel pipe may come into contact with the arc-shaped damping plate 804. However, because its diameter is small after narrowing, it has already moved to the top of the wedge-shaped part 501 when it comes into contact, and it will not affect its subsequent process of detaching from the workstation from the wedge surface of the wedge-shaped part 501.

[0031] In an optional embodiment of the invention, such as Figure 3 As shown, the necking mechanism 4 includes a necking head 401 and a shaft core 402 fixedly connected to the output end of the hydraulic cylinder 3. A necking stamping chamber is formed between the necking head 401 and the shaft core 402, and the nozzle 710 is arranged facing the area of ​​the shaft core 402 near the hydraulic cylinder 3.

[0032] It should be noted that, as mentioned above, before the steel pipe enters the area between the constriction head 401 and the shaft core 402, the lubricating oil sprayed from the nozzle 710 can be evenly distributed in the area of ​​the shaft core 402 near the hydraulic cylinder 3. This area is the area where the steel pipe will contact the shaft core 402 after constriction.

[0033] The above description of this embodiment is not limited to the specific implementation described above. The specific implementation described above is merely illustrative and not restrictive. Those skilled in the art can make many other forms based on the guidance of this embodiment, all of which are within the protection scope of this embodiment.

Claims

1. A steel pipe necking processing device, characterized in that, include: The frame (1) is fixedly installed with a feeding box (2), several limiting support frames (5), a material changing mechanism (6) and two sets of symmetrically arranged hydraulic cylinders (3). The output end of the hydraulic cylinder (3) is fixedly connected to a necking mechanism (4). The output end of the feeding box (2) is matched with the limiting support frame (5). The material changing mechanism (6) is used to push the steel pipe on the limiting support frame (5) away while pushing the steel pipe at the output end of the feeding box (2) onto the limiting support frame (5). The extrusion-type oil injection mechanism (7) is connected to the opening end of the constriction mechanism (4). The extrusion-type oil injection mechanism (7) includes a double-end unidirectional oil supply component, a telescopic oil storage component 1 and a telescopic oil storage component 2 connected to both ends of the double-end unidirectional oil supply component, a unidirectional oil injection component 1 located in the telescopic oil storage component 1, and a unidirectional oil injection component 2 located in the telescopic oil storage component 2. The other end of the telescopic oil storage component 1 is fixedly connected to the opening end of the constriction mechanism (4). The other end of the telescopic oil storage component 2 is provided with a damping layer on its outer wall. When the telescopic oil storage component 1 and the telescopic oil storage component 2 are in a compressed state, the unidirectional oil injection component 1 and the unidirectional oil injection component 2 are respectively used to spray lubricating oil into the interior of the constriction mechanism (4) and onto the surface of the steel pipe. A detachable incremental damping mechanism (8) is connected to the frame (1). The incremental damping mechanism (8) includes a vertical elastic connection component and an arc-shaped damping plate (804) connected to the vertical elastic connection component. The arc-shaped damping plate (804) is configured to cooperate with the damping layer, and the damping coefficient of the arc-shaped damping plate (804) gradually increases from one end flush with the steel pipe end to the other end. The dual-end unidirectional oil supply assembly includes a ring body two (702), an annular groove three (717) and an annular groove four (718) disposed on both ends of the ring body two (702), an annular sealing plate three (719) disposed at the opening of the annular groove three (717), a plurality of telescopic rods one (720) connected between the annular sealing plate three (719) and the inner wall of the annular groove three (717), an annular sealing plate four (721) disposed at the opening of the annular groove four (718), and a plurality of telescopic rods one (720) connected to the annular sealing plate three (719) and the inner wall of the annular groove three (717). Several telescopic rods 2 (722) between the inner wall of plate 4 (721) and annular groove 4 (718) and several oil guide pipes (723) connected to annular body 2 (702), the internal space of annular groove 3 (717) and annular groove 4 (718) are connected to the output end of oil guide pipe (723), annular sealing plate 3 (719) is located outside annular groove 3 (717), and annular sealing plate 4 (721) is located outside annular groove 4 (718); The telescopic oil storage assembly includes a ring body (701), a bellows (704) and a bellows (705) connected to one end of the ring body (701). The other ends of the bellows (704) and the bellows (705) are fixedly connected to the ring body (702). A sealed oil storage chamber is formed between the ring body (701), the ring body (702), the bellows (704) and the bellows (705). The other end of the ring body (701) is fixedly connected to the open end of the constriction mechanism (4). The one-way oil injection assembly includes an annular groove (708) on one end face of the ring body (701), an annular sealing plate (713) in the annular groove (708), a spring (714) connecting the annular sealing plate (713) and the inner wall of the annular groove (708), a plurality of through holes (709) and spray holes (710) in the ring body (701), wherein the spray holes (710) are connected to the annular groove (708) through the through holes (709), and the output ends of the plurality of spray holes (710) are all arranged in the direction of facing the inside of the constriction mechanism (4). The telescopic oil storage assembly 2 includes a ring body 3 (703), a bellows 3 (706) and a bellows 4 (707) connected to the ring body 3 (703). The other ends of the bellows 3 (706) and the bellows 4 (707) are fixedly connected to the ring body 2 (702). A sealed oil storage chamber 2 is formed between the ring body 3 (703), the ring body 2 (702), the bellows 3 (706) and the bellows 4 (707). A damping layer is provided on the ring body 3 (703). The one-way oil injection assembly includes an annular groove 2 (711) on one end face of the ring body 3 (703), an annular sealing plate 2 (715) in the annular groove 2 (711), a spring 2 (716) connected between the inner wall of the annular groove 2 (711) and the annular sealing plate 2 (715), and a plurality of spray holes 2 (712) in the ring body 3 (703). The plurality of spray holes 2 (712) are all connected to the internal space of the annular groove 2 (711), and the plurality of spray holes 2 (712) are all arranged along the radial direction of the ring body 3 (703).

2. The steel pipe necking processing device according to claim 1, characterized in that, The vertical elastic connection assembly includes a second mounting plate (801) detachably connected to the frame (1), a third telescopic rod (802) fixedly connected to the bottom of the second mounting plate (801), and a connector (803) fixedly connected to the bottom of the third telescopic rod (802). The arc-shaped damping plate (804) is fixedly connected to the connector (803), and the arc-shaped damping plate (804) is located directly above the steel pipe to be narrowed.

3. The steel pipe necking processing device according to claim 2, characterized in that, The necking mechanism (4) includes a necking head (401) and a shaft core (402) fixedly connected to the output end of the hydraulic cylinder (3). A necking stamping chamber is formed between the necking head (401) and the shaft core (402). The nozzle (710) is arranged in the area of ​​the shaft core (402) close to the hydraulic cylinder (3).

4. The steel pipe necking processing device according to claim 3, characterized in that, The limiting support frame (5) is provided with two sets of wedge-shaped parts (501), and the middle area of ​​the two sets of wedge-shaped parts (501) is used to limit and support the steel pipe to be narrowed. The material changing mechanism (6) includes a mounting frame (601) fixedly connected to the frame (1), a mounting plate (602) connected to the mounting frame (601), a hydraulic cylinder (603) connected to the output end of the mounting plate (602), and several top plates (604) fixedly connected to the hydraulic cylinder (603). The top plate (604) is provided with two sets of wedge-shaped parts (605), and the wedge-shaped parts (605) and the wedge-shaped parts (501) are staggered.

5. A method for processing steel pipe necking, characterized in that, The steel pipe necking processing device according to any one of claims 1-4 includes the following steps: Step 100: Drive the necking mechanism (4) and the extrusion-type oil injection mechanism (7) connected to the necking mechanism (4) to move synchronously toward the steel pipe to be necked located on the limit support frame (5) by the hydraulic cylinder (3); Step 200: When the damping layer on the other end of the telescopic oil storage component 2 comes into contact with the arc-shaped damping plate (804), a set value of damping is generated. Both the telescopic oil storage component 2 and the telescopic oil storage component 1 are compressed due to the resistance. During the compression process, the lubricating oil in the telescopic oil storage component 1 and the telescopic oil storage component 2 is sprayed out from the one-way oil spraying component 1 and the one-way oil spraying component 2, respectively. When the telescopic oil storage component 1 is compressed to the shortest state, the oil spraying process inside the shrinking mechanism (4) ends. The telescopic oil storage component 2 is still in the moving process until it is compressed to the shortest state. Then the oil spraying process in the shrinking area of ​​the shrinking steel pipe end ends. Step 300: The hydraulic cylinder (3) continuously drives the shrinking mechanism (4) to move toward the steel pipe to be shrunk on the limiting support frame (5) until the end of the steel pipe to be shrunk is punched and shrunken. Step 400: Control the hydraulic cylinder 1 (3) to move back, and the telescopic oil storage component 1 and the telescopic oil storage component are reset from the compressed state to the initial state. During the reset process, lubricating oil is pumped in from the double-end unidirectional oil supply component through the internal negative pressure. Step 500: The steel pipe with the narrowed end is pushed away from the limiting support frame (5) by the material changing mechanism (6) and the steel pipe to be narrowed is pushed onto the limiting support frame (5) between the feeding box (2) and the limiting support frame (5); Step 600, repeat steps 100 to 500.

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