Cold shrinkage die mechanism for small-pipe-diameter steel pipe

Abstract

The utility model relates to the field of steel pipe cold shrink mouth processing equipment, and discloses a small-pipe-diameter steel pipe cold shrink mouth die mechanism which comprises an upper die block, a lower die block located under the upper die block and a cold shrink mouth die, a hydraulic oil cylinder drives the upper die block to move upwards or downwards, an upper die groove is formed in the bottom face of the upper die block, and a lower die groove is formed in the top face of the lower die block. When the upper die block moves downwards, the upper die groove and the lower die groove are matched to clamp a steel pipe body. The cold shrinkage die comprises a shaft sleeve and a die core arranged in the shaft sleeve in a sleeved mode, a necking hole is formed in the die core, and the axis of the necking hole and the axis of the steel pipe are located on the same horizontal straight line. The device has the beneficial effects that the device is convenient to operate, the equipment cost and the mold cost are reduced, the mold is convenient to replace, the demolding is easy, and cold shrinkage opening processing can be performed on steel pipes with different specifications and pipe diameters.

Description

Technical Field

[0001] The utility model relates to the field of steel pipe cold shrinkage port processing equipment, in particular to a small-diameter steel pipe cold shrinkage port mold mechanism. Background Art

[0002] In the prior art, when the shrinkage portion of a small-diameter steel pipe is subjected to shrinkage treatment, a C-shaped support structure is often used to clamp and fix the steel pipe body, and then the shrinkage portion is subjected to shrinkage treatment. The operator can only operate on one side of the C-shaped support structure, which is very inconvenient. Moreover, the top plate of the C-shaped support structure mostly uses multiple hydraulic cylinders to fix the steel pipe, resulting in high equipment cost and poor economic benefits. In addition, the mold for shrinkage treatment of the steel pipe is mostly a single-piece integral type or a split-petal type, which has the disadvantages of high mold material cost, difficulty in mold replacement, difficulty in demolding the steel pipe after shrinkage, and low processing efficiency. Utility Model Content

[0003] In order to overcome the problems of inconvenient operation and high equipment cost of using a C-shaped support structure equipped with multiple hydraulic cylinders to fix the steel pipe during the cold shrinkage processing of the steel pipe in the above-mentioned background technology, as well as the high material cost of the existing cold shrinkage mold, inconvenient mold replacement and difficult demolding, the utility model provides a small-diameter steel pipe cold shrinkage mold mechanism, which has the beneficial effects of convenient operation, reduced equipment cost, mold cost, convenient mold replacement, easy demolding, and the ability to perform cold shrinkage processing on steel pipes of different specifications and diameters.

[0004] The technical solution of the utility model is as follows:

[0005] A small-diameter steel pipe cold shrinkage mold mechanism comprises an upper module, a lower module located directly below the upper module and a cold shrinkage mold. A hydraulic cylinder drives the upper module upward or downward. An upper mold groove is provided on the bottom surface of the upper module, and a lower mold groove is provided on the top surface of the lower module. When the upper module moves downward, the upper mold groove cooperates with the lower mold groove to clamp the steel pipe body. The cold shrinkage mold comprises a shaft sleeve and a mold core sleeved in the shaft sleeve. A shrinkage hole is provided in the mold core, and the axis of the shrinkage hole is on the same horizontal line as the axis of the steel pipe.

[0006] Compared with the prior art, the beneficial effects of this technical solution are:

[0007] (1) The operator can clamp the steel pipe from both sides of the lower module, which makes the operation more convenient and improves the production efficiency. It solves the problem that the C-type support structure used in the background technology makes the operator only able to operate on one side of the equipment, which is very inconvenient.

[0008] (2) By replacing the upper die groove, the lower die groove and the die core to adapt to the steel pipes of different diameters, the versatility of the mechanism is improved.

[0009] (3) The cold shrink mold is used in conjunction with a sleeve and a mold core. When the mold needs to be replaced, only the internal mold core needs to be replaced without replacing the entire set of cold shrink molds, which greatly reduces the material cost of the mold.

[0010] (4) In this embodiment, after the shrinkage mouth processing is completed, the upper module and the lower module continue to clamp the steel pipe, and the shrinkage mouth mold can automatically retreat to separate from the shrinkage part of the steel pipe, and the upper module automatically moves upward to leave the steel pipe. Demolding is very convenient and easy, saving manpower and improving processing efficiency. It solves the problem of difficult demolding and low processing efficiency after the shrinkage mouth of the steel pipe in the background technology.

[0011] Further preferably, the shaft sleeve and the mold core are fixed by interference fit, the shaft sleeve is made of carbon steel, and the mold core is made of alloy steel.

[0012] The beneficial effects are as follows: interference fit can ensure the connection stability between the sleeve and the mold core; carbon steel has the advantages of good corrosion resistance, wear resistance, low price and easy processing, and is suitable for making the sleeve of the shrinking mold, further reducing the material cost of the mold and saving production costs, while alloy steel is more durable and is very suitable for direct cold shrinking of steel pipes.

[0013] Preferably, one end of the sleeve away from the steel pipe is connected to a main oil cylinder, and the piston of the main oil cylinder drives the sleeve to move forward or backward horizontally. The main oil cylinder is a manual hydraulic cylinder with a flange.

[0014] Its beneficial effect is that the cold shrinkage part of the steel pipe in a fixed state can be processed in one go through the reciprocating lifting action of the main oil cylinder, thereby improving the processing efficiency.

[0015] Preferably, the shrinkage hole is provided with a smoothly transitioned chamfer at one end close to the steel pipe, the diameter of the outer end of the chamfer is larger than the diameter of the steel pipe, and the diameter of the inner end is smaller than the diameter of the steel pipe, and the shrinkage part of the steel pipe is coated with lubricating oil.

[0016] Its beneficial effects are: the chamfer design enables the steel pipe to smoothly enter the shrinking hole, and the shrinking part can be processed; the shrinking part of the steel pipe is coated with lubricating oil circumferentially, which greatly reduces the friction between the shrinking part circumferentially and the inner wall of the shrinking hole, making the shrinking process smoother.

[0017] Preferably, the hydraulic cylinder is fixed on the top plate, and the left and right sides of the bottom surface of the top plate are respectively provided with a first side plate and a second side plate vertically fixed thereto, the bottom surfaces of the first side plate and the second side plate are fixed on the same bottom plate, and the lower parts of the two are respectively provided with reinforcement plates fixedly connected to the bottom plate; the first side plate is close to the cold shrinkage part of the steel pipe.

[0018] The beneficial effect is that the top plate, the bottom plate, the first side plate and the second side plate together constitute the frame-type box support structure of the mechanism, the support structure has strong stability, and the operator can also operate the steel pipe on both sides of the support structure, which is more convenient.

[0019] Further preferably, an upper connecting plate is fixed between the hydraulic cylinder and the upper module, and the upper and lower surfaces of the upper connecting plate are fixedly connected to the piston rod of the hydraulic cylinder and the upper module by hexagon socket screws respectively.

[0020] The beneficial effect is that the setting of the upper connecting plate makes it possible to replace the upper module without removing the entire module from the piston rod when cold shrinking steel pipes of different diameters. This is more convenient and can save mold costs, solving the problem of difficulty in replacing fixings in the background technology.

[0021] Further preferably, guide connecting screws are fixed on the four corners of the upper connecting plate, the guide connecting screws pass upward through the top plate, and the end heads thereof can be snapped onto the top surface of the top plate. Under the restriction of the top plate, the guide connecting screws position and guide the upper connecting plate.

[0022] The beneficial effect is that the provision of the guide connecting screws facilitates the guiding and positioning of the upper connecting plate and the upper module, so that the upper module can maintain a stable position and direction to fix the steel pipe.

[0023] Further preferably, a lower connecting plate is fixed between the lower module and the base plate, and the upper and lower surfaces of the lower connecting plate are fixedly connected to the lower module and the base plate respectively by hexagon socket screws, and one side surface thereof is also fixedly connected to the second side plate by hexagon socket screws.

[0024] Its beneficial effects are: the setting of the lower connecting plate makes it possible to replace only the lower module without removing the entire module from the base plate when cold shrinking steel pipes of different diameters, which is more convenient and can save mold costs, and solves the problem of difficult replacement of fixing parts in the background technology; the lower connecting plate is fixedly connected to the second side plate, further ensuring the overall stability of the supporting structure.

[0025] Further preferably, an opening is opened in the middle of the first side plate, the port of the cold shrinkage part of the steel pipe is aligned with the front port of the opening, and the cold shrinkage port mold passes through the opening to process the cold shrinkage part of the steel pipe.

[0026] The beneficial effect is that this design is conducive to positioning the steel pipe and is convenient for unifying the length of the cold shrinkage part after processing.

[0027] Preferably, the hydraulic cylinder is a single 10t hydraulic cylinder.

[0028] The beneficial effect is that it can not only meet the fixing requirements of the steel pipe, but also save equipment costs, and solve the problem of high equipment costs in the background technology that the C-type support structure is fixed using multiple hydraulic cylinders. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be described with reference to the accompanying drawings, in which:

[0030] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0031] Figure 2 It is a top view of the cold shrink port mold of the utility model;

[0032] Figure 3 It is a cross-sectional view of the mold core of the utility model;

[0033] Figure 4 This is a front view of the first side panel of the utility model;

[0034] Figure 5 It is a side view of the upper module and the lower module of the utility model when clamping the steel pipe.

[0035] Figure numerals: upper module 1, upper connecting plate 11, upper die groove 12, guide connecting screw 13, lower module 2, lower connecting plate 21, lower die groove 22, shrinkage mold 3, sleeve 31, core 32, shrinkage hole 321, chamfer 322, hydraulic cylinder 4, piston rod 41, cylinder body 42, bottom end cover 43, main cylinder 5, piston 51, top plate 61, first side plate 62, opening 621, second side plate 63, bottom plate 64, reinforcement plate 65, hexagon socket screw 7, steel pipe 8, shrinkage part 81. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0037] Example 1: Figures 1 to 5A small-diameter steel pipe cold shrinkage mold mechanism shown in the figure includes a cold shrinkage mold 3, an upper module 1 and a lower module 2 located directly below the upper module 1. The hydraulic cylinder 4 is located above the upper module 1, and its piston rod 41 drives the upper module 1 to move upward or downward. The bottom surface of the upper module 1 is provided with an upper mold groove 12, and the top surface of the lower module 2 is provided with a lower mold groove 22. The upper mold groove 12 and the lower mold groove 22 are matched with the shape of the steel pipe 8. The steel pipe 8 is placed horizontally in the lower mold groove 22. When the upper module 1 moves downward, the upper mold groove 12 and the lower mold groove 22 cooperate to clamp the steel pipe 8 to fix the steel pipe 8, so as to facilitate the subsequent cold shrinkage processing of the cold shrinkage part 81 of the steel pipe 8, wherein the upper module 1 and the lower module 2 are not connected. The cold shrink mold 3 includes a sleeve 31 and a core 32 nested in the sleeve 31. The sleeve 31 and the core 32 are fixedly connected. A shrink hole 321 is provided in the core 32 along the horizontal direction. The axis of the shrink hole 321 is on the same horizontal line as the axis of the fixed steel pipe 8. The cold shrink portion 81 of the steel pipe 8 extends into the shrink hole 321. The shrink hole 321 extrude and shape the cold shrink portion 81 to complete the cold shrink processing. The above-mentioned hydraulic cylinder 4 uses a single 10t hydraulic cylinder, which can not only meet the fixing requirements of the steel pipe 8, but also save equipment costs, and solve the problem of high equipment costs in the background technology that the C-type support structure uses multiple hydraulic cylinders for fixing.

[0038] When in use, first place the steel pipe 8 in the lower die groove 22, start the hydraulic cylinder 4, the upper die block 1 moves downward, the upper die groove 12 contacts the steel pipe 8, and clamps and fixes the steel pipe 8 together with the lower die groove 22. At this time, the cold shrinking die 3 moves forward in the direction of the steel pipe 8, and its shrinking hole 321 is inserted circumferentially from the cold shrinking part 81 of the steel pipe 8. The cold shrinking die 3 continues to move forward until its end face reaches the terminal shrinkage point of the steel pipe 8. After the cold shrinking process is completed, the cold shrinking die 3 retreats backward and detaches from the cold shrinking part 81 of the steel pipe 8, and the upper die block 1 moves upward to leave the steel pipe 8, completing the demoulding work.

[0039] In this embodiment, the operator can clamp the steel pipe 8 from both sides of the lower module 2, which makes the operation more convenient and improves the production efficiency, solving the problem that the C-type support structure used in the background technology makes the operator only able to operate on one side of the equipment, which is very inconvenient; by replacing the upper die groove 12, the lower die groove 22 and the die core 32 to adapt to the steel pipes 8 of different specifications and diameters, the versatility of the mechanism is improved; the shrink port mold 3 in this embodiment adopts a sleeve 31 and a die core 32 for use in combination. When the shrink port mold 3 needs to be replaced, only the internal die core 32 needs to be replaced without replacing the entire set of shrink port mold 3, which greatly reduces the material cost of the mold; in this embodiment, after the shrink port processing is completed, the upper module 1 and the lower module 2 continue to clamp the steel pipe 8, and the shrink port mold 3 can automatically retreat to the shrink portion 81 of the steel pipe 8, and the upper module 1 automatically moves upward to leave the steel pipe 8, and demolding is very convenient and easy, saving manpower, and also improving processing efficiency, solving the problem of difficulty in demolding and low processing efficiency after the shrink port of the steel pipe 8 in the background technology.

[0040] Embodiment 2: Based on the embodiment 1, the cold shrinkage mold 3 is optimally designed, such as Figure 2 As shown, the sleeve 31 and the core 32 are fixedly connected by interference fit, which can ensure the connection stability between the two. The sleeve 31 is made of carbon steel and the core 32 is made of alloy steel. Carbon steel has the advantages of good corrosion resistance, wear resistance, low price and easy processing. It is suitable for making the sleeve 31 of the shrinking mold 3, further reducing the material cost of the mold and saving production costs. Alloy steel is more durable and is very suitable for directly performing cold shrinking processing on the steel pipe 8.

[0041] Furthermore, the end of the sleeve 31 away from the steel pipe 8 is connected to the main oil cylinder 5, and the piston 51 of the main oil cylinder 5 drives the sleeve 31 to move forward or backward horizontally. The main oil cylinder 5 uses a flanged manual hydraulic cylinder, and the sleeve 31 is fixedly connected to the piston 51 of the main oil cylinder 5 by bolt connection, which ensures the connection stability between the two. When the piston 51 of the main oil cylinder 5 is extended, it drives the sleeve 31 to push forward, so that the shrinking hole 321 of the mold core 32 is sleeved on the cold shrinkage part 81 of the steel pipe 8, and the cold shrinkage is processed. After the processing is completed, the piston 51 retracts and drives the sleeve 31 to retreat and detach from the steel pipe 8. The cold shrinkage part 81 of the steel pipe 8 in a fixed state is processed at one time through the back and forth lifting action of the main oil cylinder 5, which improves the processing efficiency.

[0042] Embodiment 3: Based on Embodiment 1, the shrinkage hole 321 is optimally designed, such as Figure 3As shown, the shrinking hole 321 of the mold core 32 is provided with a smooth transition chamfer 322 at one end close to the steel pipe 8. The diameter of the outer end of the chamfer 322 is larger than the diameter of the steel pipe 8, and the diameter of the inner end is smaller than the diameter of the steel pipe 8. This design allows the steel pipe 8 to smoothly enter the shrinking hole 321 and complete the shrinking process of the shrinking portion 81. The shrinking portion 81 of the steel pipe 8 is coated with lubricating oil circumferentially, which greatly reduces the friction between the shrinking portion 81 circumferentially and the inner wall of the shrinking hole 321, making the shrinking process smoother.

[0043] Embodiment 4: Based on Embodiment 1, a preferred design is made, the hydraulic cylinder 4 is fixed on the top plate 61, its cylinder body 42 is arranged vertically on the top plate 61, its bottom end cover 43 is fixedly connected to the top surface of the top plate 61 by bolts, its piston rod 41 vertically passes through the top plate 61 downward, the left and right sides of the bottom surface of the top plate 61 are respectively fixed with the first side plate 62 and the second side plate 63 standing opposite each other by the hexagon socket screws 7, the bottom surfaces of the first side plate 62 and the second side plate 63 are fixed to the same bottom plate 64 by welding, and the lower parts of the two are respectively fixed with the reinforcing plate 65 by the hexagon socket screws 7, and the bottom surface of the reinforcing plate 65 is also welded and fixed to the bottom plate 64, and the setting of the reinforcing plate 65 strengthens the stability and load-bearing performance of the first side plate 62 and the second side plate 63. Among them, the first side plate 62 is close to the cold shrinkage part 81 of the steel pipe 8. The top plate 61, the bottom plate 64, the first side plate 62 and the second side plate 63 together constitute the frame-type box support structure of the present mechanism. The support structure has strong stability, and the operator can also operate the steel pipe 8 on both sides of the support structure, which is more convenient.

[0044] Furthermore, the upper module 1 is fixedly connected to the hydraulic cylinder 4 through the upper connecting plate 11, the piston rod 41 of the hydraulic cylinder 4 passes through the top plate 61 and is fixedly connected to the upper connecting plate 11, and the upper and lower surfaces of the upper connecting plate 11 are respectively fixedly connected to the piston rod 41 and the upper module 1 through the hexagon socket screws 7. The setting of the upper connecting plate 11 makes it possible to replace the upper module 1 without removing the entire module from the piston rod 41 when cold shrinking the steel pipes 8 of different diameters, which is more convenient and can also save mold costs, solving the problem of difficult replacement of fixings in the background technology. A guide connecting screw 13 is provided between the top plate 61 and the upper connecting plate 11. The bottom end of the guide connecting screw 13 passes through the top plate 61 and extends into the four corners of the upper connecting plate 11. The end of the guide connecting screw 13 can be clamped on the top surface of the top plate 61. The upper connecting plate 11 moves up and down under the action of the piston rod 41 of the hydraulic cylinder 4, and the guide connecting screw 13 moves up or down with the upper connecting plate 11. When it moves downward to a certain distance, its end is clamped on the top surface of the top plate 61. The setting of the guide connecting screw 13 is convenient for guiding and positioning the upper connecting plate 11 and the upper module 1, so that the upper module 1 can maintain a stable position and direction to fix the steel pipe 8.

[0045] Embodiment 5: Based on Embodiment 4, the connection method of the lower module 2 is optimally designed, and a lower connecting plate 21 is fixed between the lower module 2 and the bottom plate 64. The upper and lower surfaces of the lower connecting plate 21 are fixedly connected to the lower module 2 and the bottom plate 64 respectively by hexagon socket screws 7. The setting of the lower connecting plate 21 makes it possible to replace the lower module 2 without removing the entire module from the bottom plate 64 when cold shrinking steel pipes 8 of different diameters, which is more convenient and can also save mold costs, solving the problem of difficult replacement of fixings in the background technology. The side of the lower connecting plate 21 is also connected to the second side plate 63 using hexagon socket screws 7, further ensuring the stability of the overall support structure.

[0046] Embodiment 4: Based on Embodiment 3, the connection mode of the lower module 2 is optimally designed, such as Figure 4 As shown, an opening 621 is opened in the middle of the first side plate 62. When performing the shrinkage process, the port of the shrinkage portion 81 of the steel pipe 8 is aligned with the front port of the opening 621. The shrinkage mold 3 passes through the opening 621 to shrink the shrinkage portion 81 of the steel pipe 8. This design is conducive to positioning the steel pipe 8 and is convenient for unifying the length of the shrinkage portion 81 after processing.

[0047] The above embodiments only express the specific implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the protection scope of the present application. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the technical solution concept of the present application, and these all belong to the protection scope of the present application.

Claims

1. A small diameter steel pipe cold shrinkage die mechanism, characterized in that: The invention comprises an upper module (1), a lower module (2) located directly below the upper module (1), and a shrinking die (3); a hydraulic cylinder (4) drives the upper module (1) to move upward or downward; an upper die groove (12) is provided on the bottom surface of the upper module (1), and a lower die groove (22) is provided on the top surface of the lower module (2); when the upper module (1) moves downward, the upper die groove (12) cooperates with the lower die groove (22) to clamp the body of the steel pipe (8); the shrinking die (3) comprises a shaft sleeve (31) and a die core (32) sleeved in the shaft sleeve (31); a shrinking hole (321) is provided in the die core (32); the axis of the shrinking hole (321) is on the same horizontal line as the axis of the steel pipe (8).

2. A small diameter steel pipe cold shrinkage die mechanism according to claim 1, characterized in that: The shaft sleeve (31) and the mold core (32) are fixed by interference fit; the shaft sleeve (31) is made of carbon steel, and the mold core (32) is made of alloy steel.

3. A small diameter steel pipe cold shrinkage die mechanism according to claim 1 or claim 2, characterized in that: One end of the shaft sleeve (31) away from the steel pipe (8) is connected to the main oil cylinder (5), and the piston (51) of the main oil cylinder (5) drives the shaft sleeve (31) to move forward or backward horizontally. The main oil cylinder (5) is a manual hydraulic cylinder with a flange.

4. A small diameter steel pipe cold shrinkage die mechanism according to claim 1, characterized in that: The shrink hole (321) is provided with a smoothly transitioned chamfer (322) at one end close to the steel pipe (8); the diameter of the outer end of the chamfer (322) is larger than the diameter of the steel pipe (8), while the diameter of the inner end is smaller than the diameter of the steel pipe (8); and the shrink portion (81) of the steel pipe (8) is coated with lubricating oil.

5. A small diameter steel pipe cold shrinkage die mechanism according to claim 1, characterized in that: The hydraulic cylinder (4) is fixed on a top plate (61), and a first side plate (62) and a second side plate (63) are respectively provided on the left and right sides of the bottom surface of the top plate (61) and are vertically fixed thereto; the bottom surfaces of the first side plate (62) and the second side plate (63) are fixed on the same bottom plate (64), and the lower parts of the two are respectively provided with a reinforcing plate (65) fixedly connected to the bottom plate (64); the first side plate (62) is close to the cold shrinkage part (81) of the steel pipe (8).

6. A small diameter steel pipe cold shrinkage die mechanism according to claim 5, characterized in that: An upper connecting plate (11) is fixed between the hydraulic cylinder (4) and the upper module (1), and the upper and lower surfaces of the upper connecting plate (11) are fixedly connected to the piston rod (41) of the hydraulic cylinder (4) and the upper module (1) via hexagon socket screws (7) respectively.

7. A small diameter steel pipe cold shrinkage die mechanism according to claim 6, characterized in that: Guide connecting screws (13) are fixed on the four corners of the upper connecting plate (11). The guide connecting screws (13) pass through the top plate (61) upwards, and their ends can be clamped on the top surface of the top plate (61). Under the restriction of the top plate (61), the guide connecting screws (13) position and guide the upper connecting plate (11).

8. The small diameter steel pipe cold shrinkage die mechanism according to claim 5, characterized in that: A lower connecting plate (21) is fixed between the lower module (2) and the bottom plate (64); the upper and lower surfaces of the lower connecting plate (21) are respectively fixedly connected to the lower module (2) and the bottom plate (64) by means of hexagon socket screws (7); and one side surface is also fixedly connected to the second side plate (63) by means of hexagon socket screws (7).

9. A small diameter steel pipe cold shrinkage die mechanism according to claim 5, characterized in that: An opening (621) is provided in the middle of the first side plate (62), the port of the cold shrinkage portion (81) of the steel pipe (8) is aligned with the front port of the opening (621), and the cold shrinkage port mold (3) passes through the opening (621) to process the cold shrinkage portion (81) of the steel pipe (8).

10. A small diameter steel pipe cold shrinkage die mechanism according to claim 1, characterized in that: The hydraulic cylinder (4) is a single 10 t hydraulic cylinder.

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