A cold drawing machine with online head-making function for pushing large-diameter seamless steel pipes with hydraulic cylinders.

Abstract

A cold drawing machine with online head-making function for large-diameter seamless steel pipes via hydraulic cylinder pushing, relating to the technical field of steel pipe cold drawing equipment. It includes a bed, on which are arranged along its length a main cylinder seat, a mold seat, and a mandrel seat at intervals. A lifting platform is provided between the mold seat and the mandrel seat, and the lifting platform has intervals of protruding ribs. A V-shaped groove for supporting and placing the steel pipe is provided in the center of each protruding rib. A lifting drive is also installed on the bed to drive the lifting platform up and down. A mandrel passes through the center of the mandrel seat, and pushing cylinders are installed at the outer ends of the mandrel seat modules on both sides of the mandrel. The telescopic ends of the pushing cylinders pass through the mandrel seat and are connected to head-making push blocks. This invention eliminates the need for slotting and can achieve online head-making of seamless steel pipes, making operation convenient, increasing the yield, and effectively improving work efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of cold drawing equipment for steel pipes, specifically a cold drawing machine with an online head-making function for pushing large-diameter seamless steel pipes with a hydraulic cylinder. Background Technology

[0002] The production of cold-drawn large-diameter seamless steel pipes (Φ273~φ914) involves passing the phosphated and saponified (or annealed) tube blank through a cold drawing machine, where a hydraulic cylinder pulls the blank and a die shapes it to form a specified hole pattern.

[0003] Before cold drawing, the tube blank needs to be headed, and then it is clamped and drawn in cold drawing clamps, such as... Figure 10 As shown, the existing head-making process involves manually opening multiple grooves 25 at the head of the seamless steel pipe 24, and then using a supporting equipment to apply shrinkage force to close the grooves, thus achieving the purpose of head making (diameter reduction). However, there are obvious defects in the actual operation: 1) a head-making machine is required; 2) large-diameter steel pipes need to be manually cut before head making, which reduces the yield, increases the workload, and makes the operation inconvenient. Utility Model Content

[0004] The purpose of this invention is to provide a cold drawing machine with a large-diameter seamless steel pipe hydraulic cylinder pushing and online head-making function, which can effectively solve the problems in the background art.

[0005] The technical solution to achieve the above objective is: a cold drawing machine with online head-making function for pushing large-diameter seamless steel pipes with hydraulic cylinders, characterized in that: it includes a bed, on which a main hydraulic cylinder seat, a mold seat, and a mandrel seat are arranged at intervals along the length direction, a lifting platform is arranged between the mold seat and the mandrel seat, and a raised rib is arranged at intervals on the lifting platform, with a V-shaped groove for supporting and placing steel pipes in the middle of the raised rib, and a lifting driver for driving the lifting platform to rise and fall is also installed on the bed; A main hydraulic cylinder is installed on the side of the main hydraulic cylinder seat away from the mold seat, which is parallel to the length direction of the bed. The extended end of the main hydraulic cylinder passes through the main hydraulic cylinder seat and is connected to a clamping trolley. The main hydraulic cylinder is used to drive the clamping trolley to move along the length direction of the bed between the main hydraulic cylinder seat and the mold seat. A circular hole is provided at the center of the mandrel holder, through which a mandrel is slidably inserted and arranged coaxially with the clamping end of the clamping trolley. A displacement drive mechanism is also installed on the bed to drive the mandrel to move along the mandrel axis. Pushing cylinders are installed at the outer ends of the mandrel seat modules on both sides of the mandrel. The telescopic end of the pushing cylinder passes through the mandrel seat and is connected to the head-making push block. The center of the head-making push block is provided with a circular hole coaxial with the mandrel. The front end of the mandrel passes through the circular hole in the center of the head-making push block and is connected to the inner mold. An outer mold is provided in the mold base. The inner mold and the outer mold cooperate to form a hole for head-making of the steel pipe.

[0006] Furthermore, the mandrel is provided with a positioning slot, and the head push block is provided with a positioning plug that is movable up and down. The positioning plug is used to position the mandrel when the inner mold at the front end of the mandrel is inserted into the mold base.

[0007] Furthermore, a winch mounted on a bracket is provided above the positioning plug-in. The lifting end of the winch is connected to a hook, and a hook hole is provided at the top center of the positioning plug-in. The winch is used to assist in inserting and removing the positioning plug-in.

[0008] Furthermore, an automatic steel pipe feeding device is installed on one side of the bed where the lifting platform is located. The automatic steel pipe feeding device is used to transport the seamless steel pipes to be cold-drawn to the lifting platform.

[0009] The beneficial effects of this utility model are: this utility model does not require slotting and can produce seamless steel tube heads online, which is convenient to operate, has a higher yield, and effectively improves work efficiency. Attached Figure Description

[0010] Figure 1 This is a top view of the present invention; Figure 2 This is a cross-sectional view of the present invention; Figure 3 for Figure 2 Enlarged view of section A in the middle; Figure 4 for Figure 2 Enlarged view of section B; Figure 5 This is a partial schematic diagram of the present invention; Figure 6 A schematic diagram showing the positioning plug-in inserted into the positioning slot. Figure 7 This is a schematic diagram of the head-making state of this utility model; Figure 8 This is a 3D view of the lifting platform; Figure 9 This is a diagram showing the positional relationship between the control head push block and the lifting platform.

[0011] Figure 10 A schematic diagram of a tube blank prepared by manual wire cutting. Detailed Implementation

[0012] like Figure 1-9As shown, this utility model discloses a cold drawing machine with a large-diameter seamless steel pipe cylinder pushing online head-making function, including a bed 1. The bed 1 is fixedly arranged with a main cylinder seat 2, a mold seat 3, and a mandrel seat 4 along the length direction. A lifting platform 6 is arranged between the mold seat 3 and the mandrel seat 4. The lifting platform 6 is provided with protruding ribs 22 arranged at intervals. The center of the protruding ribs 22 is provided with a V-shaped groove 23 for supporting and placing steel pipes. The bed 1 is also equipped with a lifting driver 7 for driving the lifting platform 6 to lift. The lifting driver 7 can be, but is not limited to, a cylinder. The lifting driver 7 is installed on the bed 1 below the lifting platform 6. The telescopic end of the lifting driver 7 is vertically upward and connected to the lifting platform 6. Preferably, the lifting platform 6 is installed on the bed 1 through a linear guide rail.

[0013] An automatic steel pipe feeding device 5 is installed on one side of the bed 1 where the lifting platform 6 is located. The automatic steel pipe feeding device 5 is used to transport the seamless steel pipe to be cold drawn to the lifting platform 6. The automatic steel pipe feeding device 5 belongs to the existing mature technology. For example, it can be, but is not limited to, the automatic steel pipe feeding device disclosed in the publication (announcement) number: CN108706325A. Those skilled in the art can also make reasonable selections from the automatic feeding products on the market.

[0014] A main hydraulic cylinder 8 is installed on the side of the main hydraulic cylinder seat 2 away from the mold seat 3, which is parallel to the length direction of the bed 1. The extended end of the main hydraulic cylinder 8 passes through the main hydraulic cylinder seat 2 and is connected to a clamping trolley 9. The main hydraulic cylinder 8 is used to drive the clamping trolley 9 to move along the length direction of the bed 1 between the main hydraulic cylinder seat 2 and the mold seat 3.

[0015] A circular hole is provided at the center of the mandrel seat 4. A mandrel 10 is slidably passed through the circular hole of the mandrel seat 4 and is arranged on the same axis as the clamping end of the clamping carriage 9. The axis of the mandrel 10 and the axis of the steel pipe supported in the V-groove 23 of the protrusion 22 are located in the same vertical plane. A displacement drive mechanism (not shown in the figure) is also installed on the bed 1 to drive the mandrel 10 to move along the mandrel axis. The displacement drive mechanism of the mandrel 10 is a conventional configuration of existing cold drawing machines. For example, a cylinder, an electric cylinder, a chain linear drive mechanism, etc. can be used, which will not be described in detail here.

[0016] Pushing cylinders 13 are installed on the outer ends of the mandrel seats 4 on both sides of the mandrel 10. The telescopic end of the pushing cylinder 13 passes inward through the mandrel seat 4 and is connected to the head-making push block 14. The center of the head-making push block 14 is provided with a circular hole coaxial with the mandrel 10. The diameter of the circular hole on the head-making push block 14 is smaller than the inner diameter of the cold-drawn steel pipe. The front end of the mandrel 10 passes through the circular hole in the center of the head-making push block 14 and is connected to the inner mold 11. An outer mold 12 is provided in the mold base 3. The hole of the outer mold 12 is a cone with the larger end facing the outer mold 12. The outer mold 12 and the inner mold 11 cooperate to form a hole for head-making the steel pipe.

[0017] As a further explanation of this embodiment, such as Figure 9 As shown, the bottom surface of the head pusher 14 is higher than the support surface of the lifting platform 6 when it rises to its highest position, so as to avoid interference between the head pusher 14 and the lifting platform 6 when the steel pipe is pushed forward.

[0018] The mandrel 10 is provided with an annular groove as a positioning slot 15. The head push block 14 is connected to two sides of the middle with L-shaped connectors 16. A guide groove is formed between the two L-shaped connectors 16. A door-shaped positioning plug 17 is inserted into the guide groove. The positioning plug 17 is used to position the mandrel 10 by inserting it into the slots on both sides of the positioning slot 15 when the inner mold 11 at the front end of the mandrel 10 is inserted into the mold base 3.

[0019] A winch 18 is mounted on the top of the positioning plug 17 via a bracket 19. The lifting end of the winch 18 is connected to a hook 20. A hook hole 21 is provided at the top center of the positioning plug 17. The winch 18 is used to cooperate in inserting and removing the positioning plug 17.

[0020] The working process of this utility model: 1) A seamless steel pipe is flipped onto the lifting platform 6 by the automatic steel pipe feeding device. The V-groove is used to achieve positioning in the width direction of the bed. The lifting drive 7 drives the lifting platform 6 to adjust the height position so that the seamless steel pipe is coaxial with the mandrel 10.

[0021] 2) The displacement drive mechanism drives the mandrel 10 forward until the inner mold 11 and outer mold 12 at the head of the mandrel form a hole of a set size. The pusher cylinder 13 drives the head-making pusher block 14 forward to push the seamless steel pipe head past the mold base 3. Under the action of the outer mold 12 and inner mold 11 in the mold base 3, the head-making of the seamless steel pipe is completed.

[0022] 3) With the assistance of the winch 18, the positioning plug 17 is inserted into the slots on both sides of the positioning slot 15 to position the mandrel 10 and prevent the mandrel 10 from springing back after the steel pipe is cold drawn.

[0023] 4) The main hydraulic cylinder 8 drives the clamp trolley 9 to clamp the end of the seamless steel pipe head forward, and then pulls the seamless steel pipe backward.

Claims

1. A cold-drawing machine with a large-diameter seamless steel tube oil cylinder pushing material online head-making function, characterized in that: The machine includes a bed, on which main cylinder seats, mold seats, and mandrel seats are arranged at intervals along the length direction. A lifting platform is provided between the mold seats and mandrel seats. The lifting platform is provided with convex ribs arranged at intervals. A V-shaped groove for supporting and placing steel pipes is provided in the middle of the convex ribs. A lifting drive is also installed on the machine to drive the lifting platform to move up and down. A main hydraulic cylinder is installed on the side of the main hydraulic cylinder seat away from the mold seat, which is parallel to the length direction of the bed. The extended end of the main hydraulic cylinder passes through the main hydraulic cylinder seat and is connected to a clamping trolley. The main hydraulic cylinder is used to drive the clamping trolley to move along the length direction of the bed between the main hydraulic cylinder seat and the mold seat. A circular hole is provided at the center of the mandrel holder, through which a mandrel is slidably inserted and arranged coaxially with the clamping end of the clamping trolley. A displacement drive mechanism is also installed on the bed to drive the mandrel to move along the mandrel axis. Pushing cylinders are installed at the outer ends of the mandrel seat modules on both sides of the mandrel. The telescopic end of the pushing cylinder passes through the mandrel seat and is connected to the head-making push block. The center of the head-making push block is provided with a circular hole coaxial with the mandrel. The front end of the mandrel passes through the circular hole in the center of the head-making push block and is connected to the inner mold. An outer mold is provided in the mold base. The inner mold and the outer mold cooperate to form a hole for head-making of the steel pipe.

2. The cold-drawing machine with the function of on-line head making of a large-diameter seamless steel tube oil cylinder pusher according to claim 1, characterized in that: The mandrel is provided with a positioning slot, and the head push block is provided with a positioning plug that can be moved up and down. The positioning plug is used to position the mandrel when the inner mold at the front end of the mandrel is inserted into the mold base.

3. The cold-drawing machine with the function of on-line head making of a large-diameter seamless steel tube oil cylinder pusher according to claim 2, characterized in that: A winch mounted on a bracket is installed above the positioning plug. The lifting end of the winch is connected to a hook. A hook hole is provided at the top center of the positioning plug. The winch is used to assist in inserting and removing the positioning plug.

4. The cold-drawing machine with the function of on-line head making of a large-diameter seamless steel tube oil cylinder pusher according to claim 1, characterized in that: An automatic steel pipe feeding device is installed on one side of the bed where the lifting platform is located. The automatic steel pipe feeding device is used to transport seamless steel pipes to be cold-drawn to the lifting platform.

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