Seamless steel tube shrinking machine

Abstract

The utility model relates to the technical field of steel pipe processing, in particular to a seamless steel pipe shrinking machine. Comprising a barrel, a plurality of fixing blocks are evenly distributed and fixed to the inner circumference of one end of the barrel, sliding blocks are slidably arranged on the fixing blocks in the radial direction of the barrel, wedge blocks are fixed to the ends, away from the fixing blocks, of the sliding blocks, and push rods are slidably arranged on the slopes of the wedge blocks; when the push rod gets close to the fixing block, the sliding block gets close to the axis of the barrel in the radial direction of the barrel under the guiding effect of the inclined face of the wedge block, the push rod is connected with a driving assembly in the barrel, and a strip-shaped pressing die is arranged at the end, facing the axis of the barrel, of the sliding block in a sliding mode, can slide in the axial direction of the barrel and is connected with a driving unit in the barrel. When the pipe contracting device contracts the seamless steel pipe, the multiple pressing dies move in the radial direction of the seamless steel pipe, the radial direction of the seamless steel pipe is not stressed when the seamless steel pipe is contracted, and the pipe contracting device is suitable for conducting pipe contracting operation on the seamless steel pipe with low strength.

Description

Technical Field

[0001] The utility model relates to the technical field of steel pipe processing, in particular to a seamless steel pipe shrinking machine. Background Art

[0002] In the metalworking industry, reducing pipes is a common operation. This process is performed using a pipe shrinking machine, which typically performs both shrinking and expanding functions. Pipe shrinking is a forming process that reduces the diameter of the end of a pipe billet. Under axial force, the pipe billet enters a deformation zone, where it undergoes tangential plastic deformation (shrinking), before entering a stable zone, ultimately resulting in a reduced end diameter. Pipe expanding is a forming process that expands the end diameter of the pipe billet. The flared shape can be conical or cylindrical. Under axial force, the pipe billet enters a deformation zone where it undergoes tangential plastic deformation (stretching), before entering a stable zone, ultimately resulting in the final shape. In the automotive industry, lightweighting of vehicle structures is becoming increasingly important due to fuel and raw material costs. Pipe shrinking and expanding technologies enable quick connection between two pipe fittings, saving connection costs. Pipe shrinking machines are specialized processing tools for reducing the diameter of heating pipes for industrial and household appliances.

[0003] Patent document CN202021221164.4 discloses an automatic tube shrinking machine. During operation, a steel pipe is first placed on the lower fixture, with the end of the steel pipe contacting the positioning plate. The first hydraulic cylinder then drives the mounting plate down, causing the upper fixture to press the steel pipe against the lower fixture. The second hydraulic cylinder then pushes the shrinking die sleeve toward the steel pipe, which squeezes the steel pipe inward to form a shrinking nipple. When the shrinking of the steel pipe is complete, the first hydraulic cylinder drives the mounting plate and upper fixture upward, causing the steel pipe attracted by the permanent magnet to rise and detach from the lower fixture. The third hydraulic cylinder then drives the upper fixture to move, and the fourth hydraulic cylinder drives the lower fixture to move, moving the upper and lower fixtures apart. A worker can then place a new steel pipe on the lower fixture and use the fifth hydraulic cylinder to drive the push plate down, pushing the steel pipe away from the permanent magnet. The shrunken steel pipe then falls into the material bin. When shrinking a steel pipe, it is necessary to activate the second hydraulic cylinder and push the shrinking die sleeve toward the steel pipe. At this time, the steel pipe receives a large axial thrust. When the strength of the steel pipe is low, the steel pipe is prone to complete failure. This shrinking machine is not suitable for low-strength steel pipes.

[0004] The patent document with application number CN201620943679.2 discloses a steel pipe reduction machine. When working, multiple reduction dies move simultaneously in the radial direction of the steel pipe to reduce the steel pipe. When the reduction machine is working, the steel pipe is not subjected to force in the axial direction, so it is suitable for steel pipes with low strength. However, the reduction machine cannot adjust the length of the reduction pipe. When the reduction length needs to be changed, reduction dies of different lengths need to be replaced. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a seamless steel pipe shrinking machine which is suitable for shrinking low-strength steel pipes and can conveniently adjust the shrinkage length.

[0006] In order to achieve the above purpose, the technical solution provided by the utility model is:

[0007] The seamless steel pipe shrinking machine includes a cylinder, and a plurality of fixed blocks are evenly distributed and fixed on the inner circumference of one end of the cylinder. Sliders are provided on the fixed blocks for sliding along the radial direction of the cylinder. A wedge is fixed on the end of the slider away from the fixed block. A push rod is provided for sliding on the inclined surface of the wedge. When the push rod approaches the fixed block, the slider approaches the axis of the cylinder along the radial direction of the cylinder under the guidance of the inclined surface of the wedge. The push rod is connected to the driving assembly in the cylinder. A strip-shaped pressing die is provided on the end of the slider toward the axis of the cylinder for sliding. The pressing die can slide along the axial direction of the cylinder, and the pressing die is connected to the driving unit in the cylinder.

[0008] Specifically, one end of the slider away from the axis of the cylinder is connected to the cylinder through a spring.

[0009] Specifically, a guide bar is fixed on the inclined surface of the wedge block, the guide bar is parallel to the inclined surface, and the push rod is slidably connected to the guide bar.

[0010] Specifically, the driving assembly includes an inner plate slidably arranged in the cylinder, the inner plate is fixedly connected to one end of the telescopic rod, the other end of the telescopic rod is fixedly connected to the fixed plate, the fixed plate is fixed in the cylinder, the telescopic rod is concentric with the cylinder, and a long groove corresponding to the die is opened on the inner plate, the length direction of the long groove is parallel to the sliding direction of the slider, the die passes through the long groove, and the die is slidably arranged in the long groove.

[0011] Specifically, the driving unit includes an adjusting ring, which is located in the cylinder, the telescopic rod passes through the adjusting ring, the telescopic rod is slidingly connected to the adjusting ring, a slot corresponding to the long slot is opened on the adjusting ring, the length direction of the slot is parallel to the length direction of the long slot, one end of the die is slidingly engaged in the slot, a screw is threadedly connected on the fixed plate, the screw passes through the fixed plate, the axis of the screw is parallel to the axis of the cylinder, and the screw is rotatably connected to the adjusting ring.

[0012] Specifically, a polished rod parallel to the screw rod is fixed on the adjusting ring, the polished rod passes through the fixing plate, and the polished rod is slidably connected to the fixing plate.

[0013] Specifically, the clamping groove is a T-shaped groove, and a T-shaped block is fixed to one end of the pressing die close to the adjusting ring, and the T-shaped block is slidably clamped in the clamping groove.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. When the utility model shrinks the seamless steel pipe, multiple pressing dies are moved along the radial direction of the seamless steel pipe. When the seamless steel pipe is shrunk, the radial direction thereof is not subjected to force, and the utility model is suitable for shrinking the seamless steel pipe with low strength.

[0016] 2. The die can move along the axial direction of the cylinder, so the length of the overlapping area between the die and the seamless steel pipe can be changed, and the length of the shrinkage tube can be adjusted, which has a wide range of applications.

[0017] 3. By rotating the screw to make the adjusting ring move in the axial direction of the inner tube, multiple dies can be driven to move at the same time, which is convenient for adjusting the length of the shrink tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the present utility model.

[0019] Figure 2 It is a front view of the utility model.

[0020] Figure 3 for Figure 2 Cross-sectional view along the AA axis.

[0021] Figure 4 Schematic diagram of the sliding fit between the die and the slot.

[0022] The names of the parts in the accompanying drawings are:

[0023] 1 cylinder

[0024] 2 fixed blocks

[0025] 3 Sliders

[0026] 4. Die

[0027] 5 Wedge

[0028] 6 Putt

[0029] 7 Inner plate

[0030] 8 telescopic rod

[0031] 9 Fixing plate

[0032] 10 guide bars

[0033] 11 Spring

[0034] 12 long slots

[0035] 13 screw

[0036] 14 Bare

[0037] 15 Adjusting ring 16 Slot DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0039] Example 1: Reference Figures 1-4 As shown, the seamless steel pipe reduction machine includes a cylinder 1, and a plurality of fixed blocks 2 are evenly distributed and fixed on the inner circumference of one end of the cylinder 1. Slide blocks 3 are slidably provided on the fixed blocks 2 along the radial direction of the cylinder 1, and the end of the slide blocks 3 away from the axis of the cylinder 1 is connected to the cylinder 1 through a spring 11. A wedge block 5 is fixed to the end of the slide block 3 away from the fixed block 2, and a push rod 6 is slidably provided on the inclined surface of the wedge block 5. Specifically, a guide bar 10 is fixed on the inclined surface of the wedge block 5, and the guide bar 10 is parallel to the inclined surface. The push rod 6 is slidably connected to the guide bar 10. When the push rod 6 approaches the fixed block 2, the slide block 3 approaches the axis of the cylinder 1 along the radial direction of the cylinder 1 under the guiding action of the inclined surface of the wedge block 5.

[0040] The push rod 6 is connected to the drive assembly in the cylinder 1. The drive assembly includes an inner plate 7 slidably arranged in the cylinder 1. The inner plate 7 is fixedly connected to one end of the telescopic rod 8, and the other end of the telescopic rod 8 is fixedly connected to the fixed plate 9. The fixed plate 9 is fixed in the cylinder 1. The telescopic rod 8 is concentric with the cylinder 1. The inner plate 7 is provided with a long groove 12 corresponding to the die 4. The length direction of the long groove 12 is parallel to the sliding direction of the slider 3. The die 4 extends through the long groove 12 and is slidably arranged in the long groove 12.

[0041] A strip-shaped pressing die 4 is slidably provided at one end of the slider 3 toward the axis of the cylinder 1 . The pressing die 4 can slide along the axial direction of the cylinder 1 , and the pressing die 4 is connected to a driving unit in the cylinder 1 .

[0042] The driving unit includes an adjusting ring 15, which is located inside the barrel 1. The telescopic rod 8 passes through the adjusting ring 15 and is slidably connected to the adjusting ring 15. A slot 16 corresponding to the long slot 12 is provided on the adjusting ring 15, and the length direction of the slot 16 is parallel to the length direction of the long slot 12. One end of the die 4 is slidably engaged in the slot 16. Specifically, the slot 16 is a T-shaped slot, and a T-shaped block is fixed to the end of the die 4 close to the adjusting ring 15, and the T-shaped block is slidably engaged in the slot 16. A screw 13 is threadedly connected to the fixing plate 9, which passes through the fixing plate 9. The axis of the screw 13 is parallel to the axis of the barrel 1, and the screw 13 is rotatably connected to the adjusting ring 15.

[0043] When shrinking the tube, one end of the seamless steel tube is inserted into the cylinder 1. At this time, the seamless steel tube portion in the cylinder 1 is located between multiple dies 4. Start the telescopic rod 8, so that the inner plate 7 drives the push rod 6 close to the fixed block 2. In the process of the inner plate 7 driving the push rod 6 close to the fixed block 2, under the guidance of the upper inclined surface of the wedge block 5, the slider 3, the wedge block 5, the guide bar 10 and the die 4 move toward the center of the cylinder 1. At the same time, the spring 11 is stretched. In the process of the die 4 moving toward the center of the cylinder 1, the die 4 slides in the long groove 12, and the T-shaped block slides in the slot 16. In the process of multiple dies 4 moving simultaneously toward the axial direction of the cylinder 1, the seamless steel tube can be squeezed and the seamless steel tube can be shrunk.

[0044] After the seamless steel tube is reduced, the telescopic rod 8 is activated, so that the inner plate 7 drives the push rod 6 away from the fixed block 2. During the process of the inner plate 7 driving the push rod 6 away from the fixed block 2, the slider 3 and the pressing die 4 are separated from the seamless steel tube by the elastic force of the spring 11. Then the seamless steel tube can be taken out from the cylinder 1.

[0045] When the shrinkage length needs to be adjusted, the screw 13 is rotated, and the screw 13 causes the multiple dies 4 to move simultaneously along the axial direction of the barrel 1 through the adjustment ring 15. After the dies 4 move along the axial direction of the barrel 1, the length of the overlapping area between the dies 4 and the seamless steel pipe can be changed, thereby achieving the purpose of adjusting the shrinkage length.

[0046] Example 2: Based on the example 1, refer to Figure 3 As shown, a polished rod 14 parallel to the screw rod 13 is fixed on the adjusting ring 15 , and the polished rod 14 passes through the fixing plate 9 , and the polished rod 14 is slidably connected to the fixing plate 9 .

[0047] When the screw 13 moves multiple dies 4 simultaneously along the axial direction of the cylinder 1 through the adjusting ring 15, the cooperation between the polished rod 14 and the fixing plate 9 can improve the stability of the adjusting ring 15 and the dies 4 in the axial direction of the cylinder 1.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A seamless steel pipe shrinking machine, comprising a cylinder (1), wherein a plurality of fixed blocks (2) are evenly distributed and fixed on the inner circumference of one end of the cylinder (1), a slider (3) is provided on the fixed block (2) so as to slide along the radial direction of the cylinder (1), a wedge block (5) is fixed on the end of the slider (3) away from the fixed block (2), a push rod (6) is provided on the inclined surface of the wedge block (5) so as to slide, when the push rod (6) approaches the fixed block (2), the slider (3) approaches the axis of the cylinder (1) along the radial direction of the cylinder (1) under the guiding action of the inclined surface of the wedge block (5), and the push rod (6) is connected to the driving component in the cylinder (1), characterized in that: A strip-shaped pressing die (4) is provided on one end of the slider (3) which is slidable toward the axis of the cylinder (1). The pressing die (4) can slide along the axial direction of the cylinder (1). The pressing die (4) is connected to a driving unit in the cylinder (1).

2. The seamless steel pipe reducing machine according to claim 1, characterized in that: One end of the slider (3) away from the axis of the cylinder (1) is connected to the cylinder (1) via a spring (11).

3. The seamless steel pipe reducing machine according to claim 1, characterized in that: A guide bar (10) is fixed on the inclined surface of the wedge block (5), the guide bar (10) is parallel to the inclined surface, and the push rod (6) is slidably connected to the guide bar (10).

4. The seamless steel pipe reducing machine according to claim 1, characterized in that: The driving assembly comprises an inner plate (7) slidably arranged in the cylinder (1), the inner plate (7) being fixedly connected to one end of the telescopic rod (8), the other end of the telescopic rod (8) being fixedly connected to the fixed plate (9), the fixed plate (9) being fixed in the cylinder (1), the telescopic rod (8) being concentric with the cylinder (1), the inner plate (7) being provided with a long groove (12) corresponding to the die (4), the length direction of the long groove (12) being parallel to the sliding direction of the slider (3), the die (4) passing through the long groove (12), and the die (4) being slidably arranged in the long groove (12).

5. The seamless steel pipe reducing machine according to claim 4, characterized in that: The driving unit comprises an adjusting ring (15), the adjusting ring (15) is located in the barrel (1), the telescopic rod (8) passes through the adjusting ring (15), the telescopic rod (8) and the adjusting ring (15) are slidably connected, a clamping groove (16) corresponding to the long groove (12) is provided on the adjusting ring (15), the length direction of the clamping groove (16) is parallel to the length direction of the long groove (12), one end of the pressing die (4) is slidably clamped in the clamping groove (16), a screw rod (13) is threadedly connected on the fixing plate (9), the screw rod (13) passes through the fixing plate (9), the axis of the screw rod (13) is parallel to the axis of the barrel (1), and the screw rod (13) is rotatably connected to the adjusting ring (15).

6. The seamless steel pipe reducing machine according to claim 5, characterized in that: A polished rod (14) parallel to the screw rod (13) is fixed on the adjusting ring (15); the polished rod (14) passes through the fixing plate (9); and the polished rod (14) is slidably connected to the fixing plate (9).

7. The seamless steel pipe reducing machine according to claim 5, characterized in that: The clamping groove (16) is a T-shaped groove, and a T-shaped block is fixed to one end of the pressing die (4) close to the adjusting ring (15), and the T-shaped block is slidably clamped in the clamping groove (16).

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