A pipe bending device for mold cooling steel pipe

Abstract

The present invention provides a pipe bending device for mold cooling steel pipes, which belongs to the field of mold manufacturing technology. It solves the problem of how to improve the pipe bending efficiency of mold cooling steel pipes to improve the mold manufacturing efficiency. The device includes a workbench, a base, a positioning clamp, a pipe bending block, a fixed shaft, a turntable, and a pressure cover. The turntable is provided with a plurality of positioning columns, each of which is provided with a compression spring and a fan-shaped support sheet. The radius of each support sheet is different. The two ends of the compression spring are respectively against the corresponding support sheet and the turntable, and the distance between the two is greater than or equal to the thickness of the support sheet; a connecting rod rotatably connected to the fixed shaft and retractable is provided below the turntable, and the pipe bending block is hinged on the connecting rod; a pressure rod is provided on the pressure cover, and the pressure rod can push one of the support sheets downward and make the support sheet abut against the upper surface of the turntable. At this time, the support sheet can cooperate with the pipe bending block to form a clamp for bending the steel pipe. The device can cope with the bending requirements of various inner fillet radii.

Description

Technical Field

[0001] The invention belongs to the technical field of mold manufacturing and relates to a pipe bending device for cooling a mold steel pipe. Background Art

[0002] Hot runner molds are molds that use heating devices to keep the melt in the runner from solidifying. Hot runner technology has many advantages, such as shortening the molding cycle, saving plastic raw materials, reducing waste, improving product quality, eliminating subsequent processes, and facilitating production automation. It has been widely used in industrially developed countries and regions in the world today.

[0003] In a hot runner mold, in order to inject high-quality finished products, improve the surface finish of plastic films, and reduce the scrap rate of finished products, it is best to keep the injection mold at a constant temperature. The most commonly used temperature control method is to control the temperature inside the mold by designing a cooling pipeline structure. For example, in an injection mold for producing a front door handle cover plate disclosed in a Chinese patent [Authorization Announcement No.: CN216068432U], the cooling pipeline needs to be arranged in accordance with the cooling needs of the hot runner. The entire cooling pipeline is complicated and requires a lot of bending processing. In the prior art, for the steel pipes of the above-mentioned cooling pipelines, workers generally bend the steel pipes using tools such as steel pipe sleeves and wrenches, or use pipe bending devices such as pipe bender to bend the steel pipes. For example, Chinese patent CN203678965U discloses a high-precision and efficient pipe bending device, which includes a base, a pipe bending body fixed on the base, a connecting plate, a pipe bending block and a fixed block. One end of the connecting plate is movably connected to the pipe bending body through a main body screw, and the pipe bending block is fixedly connected to the other end of the connecting plate through a fixing screw. The pipe bending device also includes studs and stud gaskets, and the pipe bending body is fixedly installed on the device base through the studs and the stud gaskets.

[0004] However, when the existing bending device is used to bend the mold steel pipe, the following defects exist: Since the bending of the mold steel pipe requires the design of the mold pipeline, the mold steel pipe has various bending angles and a variety of inner fillet radii. When the bending requirements of different inner fillet radii are met, the above-mentioned bending device can only be achieved by replacing the bending body (also known as the bending mold) and the bending block of different specifications and sizes. Since the bending body and the bending block are repeatedly replaced and disassembled, it is very troublesome. This makes the existing bending device more troublesome to operate, and also greatly affects the bending efficiency of the mold cooling steel pipe, thereby affecting the overall manufacturing efficiency of the mold. In this regard, the conventional means that technicians in this field can easily think of is to improve the disassembly efficiency by improving the disassembly structure of the bending body and the bending block, such as changing the threaded connection to a quick-release structure such as a clamping connection, so as to improve the above-mentioned manufacturing efficiency. Summary of the invention

[0005] The purpose of the present invention is to address the above-mentioned problems in the existing technology and to propose a pipe bending device for mold cooling steel pipes. The technical problem to be solved by the present invention is how to improve the pipe bending efficiency of the mold cooling steel pipes to improve the mold manufacturing efficiency.

[0006] The object of the present invention can be achieved through the following technical solutions: a pipe bending device for cooling steel pipes of a mold, comprising a workbench and a base fixed on the workbench and in the shape of an elongated strip, a positioning clamp having a positioning groove being fixedly connected to the rear end of the base, a pipe bending block connected to a handle being provided on one side of the positioning clamp, characterized in that a fixed shaft which can move along the width direction of the base and is arranged vertically is slidably arranged on the workbench near the rear end of the base, a turntable is rotatably connected to the fixed shaft, and the turntable can be locked with the workbench through a locking mechanism; a plurality of positioning columns evenly arranged along the circumference of the turntable are fixed to the upper surface of the turntable, each positioning column is sequentially sleeved with a compression spring and a fan-shaped support sheet from bottom to top, the radius of each support sheet is different, and each support sheet is aligned with the corresponding The positioning column is slidably fitted and circumferentially positioned, and the two ends of the compression spring respectively abut against the lower surface of the corresponding mold piece and the upper surface of the turntable, and the spacing between the lower surface of the mold piece and the upper surface of the turntable is greater than or equal to the thickness of the mold piece; a retractable connecting rod is provided under the turntable, one end of the connecting rod is rotatably connected to the fixed shaft, and the bending block is hinged on the other end of the connecting rod; a pressure cover is also detachably connected to the fixed shaft, and the pressure cover is located above each mold piece. A pressure rod is vertically slidably connected to the pressure cover, and a hook for locking the pressure rod is also fixed on the upper surface of the pressure cover, and the pressure rod can push one of the mold pieces downward and make the mold piece abut against the upper surface of the turntable. At this time, the mold piece can cooperate with the bending block to form a clamp for bending the steel pipe.

[0007] Different from the pipe bending device in the prior art which can only bend steel pipes with one specification of inner fillet radius, if inner fillets with different radii are to be bent, this can only be achieved by repeatedly disassembling and replacing the pipe bending template and the pipe bending block; the present invention redesigns the pipe bending device and adopts a switching design of multiple template pieces, so that the device does not need to repeatedly disassemble and assemble the pipe bending template and the pipe bending block to cope with the bending requirements of various inner fillet radii, and the operation is simple and convenient, thereby improving the pipe bending efficiency of the mold cooling steel pipe, and further improving the mold manufacturing efficiency.Specifically, the design principle of the pipe bending device is as follows: first, a fixed axis that can move along the width direction of the base and is arranged vertically is slidably set on a workbench near the rear end of the base, and then a turntable is rotatably set on the fixed axis, and the turntable can be locked with the workbench through a locking mechanism. Through the above design, the turntable can not only move along the width direction of the base, but also rotate; on the basis of the above basic design, a number of templates with different radii are designed on the turntable, that is, a number of positioning columns evenly arranged along the circumference of the turntable are fixed on the upper surface of the turntable, each of the templates is slidably matched with the corresponding positioning column and circumferentially positioned, so that each template can be designed as The turntable rotates and moves, that is, people can switch and select the supporting mold pieces of the required size only by controlling the rotation of the turntable, and then control the movement of the turntable to control the supporting mold pieces to move to the corresponding bending station; at the same time, a compression spring is arranged between the supporting mold piece and the turntable, and the two ends of the compression spring are respectively against the lower surface of the corresponding supporting mold piece and the upper surface of the turntable, and the spacing between the lower surface of the supporting mold piece and the upper surface of the turntable is greater than or equal to the thickness of the supporting mold piece. Through this design, each supporting mold piece is suspended above the turntable, and one of the supporting mold pieces can be staggered up and down with the remaining supporting mold pieces after being compressed, so as to avoid the interference of the supporting mold piece with the other supporting mold pieces when in use; and then through the design of retractable A connecting rod, that is, one end of the connecting rod is rotatably connected to the fixed shaft, and the bending block is hinged on the other end of the connecting rod, so that no matter which radius of the template is selected, the bending block can be moved to a position that cooperates with the template, thereby ensuring the bending operation of the steel pipe by templates of different radiuses, and also making it unnecessary to disassemble and replace the bending block; finally, a pressure cover is designed. On the one hand, the pressure cover can prevent the template from falling out, and on the other hand, a pressure rod that slides vertically and a hook for locking the pressure rod are designed on the pressure cover. Since the pressure cover is detachable, the arrangement position of the pressure rod can be adaptively adjusted according to the actual number of templates and the bending area of ​​the steel pipe. When assembling this device, it only needs to be adjusted to the steel pipe bending operation position. The mold piece can be switched to the inner surface by rotating the turntable, and then, when the corresponding mold piece is switched out by rotating the turntable, the pressure rod can push the mold piece downward and make the mold piece stick to the upper surface of the turntable. At this time, the mold piece can cooperate with the bending block to form a clamp for bending the steel pipe, so as to achieve the stable placement of the mold piece; therefore, through the coordinated design of the above fixed shaft, turntable, mold piece, compression spring, retractable connecting rod and pressure rod hook, it is only necessary to control the rotation of the turntable to switch the mold pieces of different radii, and then operate the pressure rod to press down and lock the corresponding mold piece, and then control the mold piece to move to the bending station to realize the adjustment and switching of the mold piece, so that the device can well meet the bending requirements of inner fillets of different radii, and the switching operation is simple and convenient, thereby greatly improving the bending efficiency of the mold cooling steel pipe, and thus improving the mold manufacturing efficiency.

[0008] In the above-mentioned bending device for mold cooling steel pipe, the pressure rod includes a vertical rod portion arranged in the vertical direction and a horizontal rod portion arranged in the horizontal direction. The vertical rod portion is slidably matched with the pressure cover and the upper end is fixedly connected to the horizontal rod portion. The free end of the horizontal rod portion is fixedly connected to a handle arranged in the vertical direction, and the horizontal rod portion can be clamped in the hook. Through the above pressure rod design, it is only necessary to control the handle to control the vertical rod portion to move downward to achieve downward pressure. After the downward pressure is completed, the handle can be turned to make the horizontal rod portion clamped in the hook to achieve locking. The entire downward locking operation is simple and convenient, making the switching of the mold piece very convenient, which is conducive to improving the bending efficiency of the mold cooling steel pipe, thereby improving the mold manufacturing efficiency.

[0009] In the above-mentioned bending device for mold cooling steel pipe, a rubber block is fixed at the lower end of the vertical rod. Through the above rubber block design, the elasticity of the rubber block can be used to prevent loosening on the one hand, and on the other hand, the pressure rod can apply a greater extrusion force to make the mold sheet pressed more firmly, which is conducive to ensuring the smooth progress of the bending operation, and further ensuring that the device can meet the bending requirements of different radius fillets, thereby improving the bending efficiency of the mold cooling steel pipe.

[0010] In the above-mentioned bending device for mold cooling steel pipe, the connecting rod includes a fixed rod, a telescopic rod and a tension spring. The telescopic rod is provided with a slide groove arranged along the length direction. One end of the fixed rod is rotatably connected to the fixed shaft, and the other end of the fixed rod is inserted in the slide groove and slidably cooperates with the telescopic rod. The tension spring is located on one side of the telescopic rod and arranged along the length direction of the telescopic rod. The two ends of the tension spring are respectively fixed to the fixed rod and the telescopic rod, and the bending block is hinged on the telescopic rod. Through the connecting rod structure designed above, the connecting rod can be elastically extended and retracted. In this way, when switching to use mold pieces of different radii, people only need to pull the bending block to achieve adjustment, so that the bending block can cooperate well with the mold piece to form a clamp. The operation is simple and convenient, which is conducive to improving the bending efficiency of the mold cooling steel pipe, and then improving the mold manufacturing efficiency.

[0011] In the above-mentioned bending device for cooling steel pipes of the mold, a mounting groove is provided on one side of the bending block, and a plurality of rollers arranged along the length direction of the mounting groove are rotatably connected in the mounting groove, and the outer peripheral surface of the roller has an annular groove adapted to the outer diameter of the steel pipe and having an arc-shaped cross section, and the outer peripheral surface of each of the mold plates has a matching groove adapted to the outer diameter of the steel pipe and having an arc-shaped cross section, and the matching groove and the annular groove can form the above-mentioned clamp when facing each other. The above roller design is helpful to reduce the friction between the steel pipe and the above-mentioned clamp, so that the bending block is not easy to get stuck when performing the bending operation around the mold plate, which is helpful to improve the bending efficiency of the mold cooling steel pipe, thereby improving the mold manufacturing efficiency.

[0012] In the above-mentioned bending device for mold cooling steel pipe, a limit column parallel to the length direction of the base is fixed on one side of the positioning clamp block, and the connecting rod can be against the limit column and perpendicular to the length direction of the base. The above limit column design facilitates the operator to find the initial position of the bending block, which is conducive to improving the bending efficiency of the mold cooling steel pipe, thereby improving the mold manufacturing efficiency.

[0013] In the above-mentioned bending device for cooling steel pipes of the mold, the cross section of the positioning column is square or elliptical. Through the shape design of the positioning column, the connection and cooperation between the mold plate and the positioning column is realized, and the structure is reasonable and simple.

[0014] In the above-mentioned bending device for mold cooling steel pipe, a slide is fixed on the workbench near the rear end of the base, a track arranged along the width direction of the base is provided in the slide, a slide is slidably connected in the track, the fixed shaft is vertically fixed on the slide, a screw is also rotatably connected to the slide, one end of the screw is connected to the slide with a threaded transmission, the other end of the screw is rotatably connected to the slide and extends out of the slide and is fixed with a hand wheel. Through the above design, the movement and adjustment of the fixed shaft can be achieved by simply turning the hand wheel, and the operation is simple and convenient, so that the mold piece can be quickly moved to the bending station after switching, which is beneficial to improving the bending efficiency of the mold cooling steel pipe.

[0015] In the above-mentioned bending device for mold cooling steel pipe, the locking mechanism includes a pawl hinged on the workbench and a ratchet arranged on the outer peripheral surface of the turntable, and the pawl is clamped on the ratchet and enables the turntable to be unidirectionally locked with the workbench along the bending direction. Through the above unidirectional locking method of the pawl and ratchet, the turntable can be rotated and automatically locked after the rotation, so that the locking operation of the turntable is very convenient, which is beneficial to improve the bending efficiency of the mold cooling steel pipe. At the same time, since the turntable is locked in the same direction as the bending direction, that is, the turntable can be unidirectionally rotated in the direction opposite to the bending direction, it is beneficial to improve the stability of the bending operation.

[0016] As an alternative, in the above-mentioned bending device for mold cooling steel pipe, the locking mechanism includes a locking pin and a plurality of positioning holes evenly arranged along the circumference of the turntable, and the locking pin passes through one of the positioning holes and can be inserted on the workbench. Through the above design, the turntable can be locked by simply plugging and pulling out the locking pin, which is simple and convenient to operate and is conducive to improving the bending efficiency of the mold cooling steel pipe.

[0017] Compared with the prior art, the present tube bending device for mold cooling steel tubes has the following advantages: the present device is cleverly designed with a fixed shaft, a turntable, multiple mold plates, a compression spring, a retractable connecting rod and a compression rod hook, so that the present device can cope with various bending requirements of inner fillet radius without repeatedly disassembling and assembling the tube bending mold and the tube bending block. It is not only highly applicable but also easy to operate, thereby greatly improving the tube bending efficiency of the mold cooling steel tubes and thereby improving the mold manufacturing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the pipe bending device in the first embodiment.

[0019] Figure 2 It is a schematic diagram of the partial structure of the pipe bending device in the first embodiment.

[0020] Figure 3 It is a schematic diagram of the exploded structure of the pipe bending device in the first embodiment.

[0021] Figure 4 It is a structural schematic diagram of the pull rod in the pipe bending device.

[0022] Figure 5 It is a structural schematic diagram of the pipe bending block in the pipe bending device.

[0023] In the figure, a, steel pipe; 1, workbench; 2, base; 3, positioning clamp; 31, positioning groove; 4, bending block; 4a, handle; 41, mounting groove; 42, roller; 421, annular groove; 5, fixed shaft; 6, turntable; 7, positioning column; 8, compression spring; 9, mold plate; 91, matching groove; 10, connecting rod; 101, fixed rod; 102, telescopic rod; 1021, slide groove; 103, tension spring; 11, pressure cover; 12, pressure rod; 121, vertical rod; 122, horizontal rod; 123, handle; 124, rubber block; 13, hook; 14, clamp; 15, limit column; 16, slide seat; 17, slide seat; 18, screw rod; 19, handwheel; 20, pawl; 21, ratchet. DETAILED DESCRIPTION

[0024] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0025] Embodiment 1

[0026] Specifically, if Figure 1 , Figure 2 and Figure 3As shown, the bending device for cooling steel pipes of the mold comprises a workbench 1 and a base 2 fixed on the workbench 1 and in a long strip shape, a positioning clamp 3 with a positioning groove 31 is fixedly connected to the rear end of the base 2, a bending block 4 with a handle 4a is provided on one side of the positioning clamp 3, a fixed shaft 5 which can move along the width direction of the base 2 and is arranged vertically is slidably arranged on the workbench 1 near the rear end of the base 2, a turntable 6 is rotatably connected to the fixed shaft 5, and the turntable 6 can be locked with the workbench 1 through a locking mechanism, and the locking mechanism comprises a ratchet 20 hinged on the workbench 1 and a pawl 20 arranged on the turntable 1. The ratchet teeth 21 on the outer circumference of the disk 6, the pawl 20 is stuck on the ratchet teeth 21 and enables the turntable 6 to be unidirectionally locked with the workbench 1 along the bending direction; a plurality of positioning posts 7 uniformly arranged along the circumference of the turntable 6 are fixed on the upper surface of the turntable 6, and the cross-section of the positioning posts 7 is square or elliptical, and each positioning post 7 is sequentially sleeved with a compression spring 8 and a fan-shaped support sheet 9 from bottom to top, and the radius of each support sheet 9 is different, and each support sheet 9 is slidably matched with the corresponding positioning post 7 and circumferentially positioned. In this embodiment, there are four support sheets 9, and the radius is arranged in sequence from large to small along the circumference of the turntable 6. The two ends of the compression spring 8 respectively abut against the lower surface of the corresponding support sheet 9 and the upper surface of the turntable 6, and the distance between the lower surface of the support sheet 9 and the upper surface of the turntable 6 is greater than or equal to the thickness of the support sheet 9; a retractable connecting rod 10 is provided under the turntable 6, one end of the connecting rod 10 is rotatably connected to the fixed shaft 5, and the bending pipe block 4 is hinged on the other end of the connecting rod 10; a limiting column 15 parallel to the length direction of the base 2 is fixed on one side of the positioning clamp 3, and the connecting rod 10 can abut against the limiting column 15 and be perpendicular to the length direction of the base 2. A pressure cover 11 is detachably connected to the fixed shaft 5, and the pressure cover 11 is located above each mold piece 9. A pressure rod 12 is vertically slidably connected to the pressure cover 11, and a hook 13 for locking the pressure rod 12 is fixed on the upper surface of the pressure cover 11. The pressure rod 12 can push one of the mold pieces 9 to move downward and make the mold piece 9 rest against the upper surface of the turntable 6. At this time, the mold piece 9 can cooperate with the bending block 4 to form a clamp 14 for bending the steel pipe a.

[0027] More specifically, Figure 3As shown, a slide 16 is fixed on the workbench 1 near the rear end of the base 2. A track arranged along the width direction of the base 2 is provided in the slide 16. A slide seat 17 is slidably connected in the track. The fixed shaft 5 is fixed to the slide seat 17 in the vertical direction. A screw rod 18 is also rotatably connected to the slide 16. One end of the screw rod 18 is threadedly connected to the slide seat 17, and the other end of the screw rod 18 is rotatably connected to the slide 16 and extends out of the slide seat 17 and is fixed with a handwheel 19. The pressure rod 12 includes a vertical rod portion 121 arranged vertically and a horizontal rod portion 122 arranged horizontally. The vertical rod portion 121 is slidably matched with the pressure cover 11 and the upper end is fixedly connected to the horizontal rod portion 122. A rubber block 124 is fixed to the lower end of the vertical rod portion 121. The free end of the horizontal rod portion 122 is fixedly connected to a handle 123 arranged vertically. The horizontal rod portion 122 can be clamped in the hook 13. As shown Figure 4 The connecting rod 10 shown includes a fixed rod 101, a telescopic rod 102 and a tension spring 103. The telescopic rod 102 is provided with a slide groove 1021 arranged along the length direction. One end of the fixed rod 101 is rotatably connected to the fixed shaft 5, and the other end of the fixed rod 101 is inserted into the slide groove 1021 and slidably cooperates with the telescopic rod 102. The tension spring 103 is located on one side of the telescopic rod 102 and arranged along the length direction of the telescopic rod 102. The two ends of the tension spring 103 are respectively fixedly connected to the fixed rod 101 and the telescopic rod 102, and the bending pipe block 4 is hinged on the telescopic rod 102. Figure 5 As shown, a mounting groove 41 is provided on one side of the bending block 4, and a plurality of rollers 42 arranged along the length direction of the mounting groove 41 are rotatably connected in the mounting groove 41. The outer peripheral surface of the roller 42 has an annular groove 421 which is adapted to the outer diameter of the steel pipe a and has an arc-shaped cross-section. The outer peripheral surface of each mold plate 9 has a matching groove 91 which is adapted to the outer diameter of the steel pipe a and has an arc-shaped cross-section. When the matching groove 91 and the annular groove 421 are opposite to each other, the above-mentioned clamping opening 14 can be formed.

[0028] When assembling this device, the position of the pressure rod 12 on the pressure plate is adaptively adjusted according to the number of mold plates 9 and the bending area of ​​the steel pipe a, so that it is adjusted to the bending operation station of the steel pipe a and is compatible with the bending station of the steel pipe a. As in the present embodiment, if there are four mold plates 9, the pressure rod 12 is located in the upper right quarter of the pressure plate. After the assembly and debugging are completed, the working process of this pipe bending device is as follows: First, place the steel pipe a to be bent on the base 2, and locate the position of the steel pipe through the positioning groove 31 of the positioning clamp 3 fixed to the base 2; after the placement is completed, according to the inner fillet radius required for the bending of the steel pipe a, select the corresponding mold plate 9 by rotating the turntable 6, and then operate the pressure rod 12 to press down so that the corresponding mold plate 9 fits with the upper surface of the turntable 6, and the bending is completed. After being pressed down, the pressure rod 12 is locked by the hook 13 so that the support mold piece 9 and the turntable 6 are locked; after the support mold piece 9 is selected, the bending block 4 is pulled to cooperate with the support mold piece 9 to form a clamp 14 for bending the steel pipe a, and then the centering operation is performed, that is, the fixed axis 5 is moved so that the center line of the above-mentioned clamp 14 coincides with the center line of the steel pipe a, so that the support mold piece 9 falls into the bending station; after it is in place, the steel pipe a is controlled to pass through the clamp 14, and then the bending block 4 is controlled to revolve around the support mold piece 9, so as to realize the bending of the required inner fillet radius of the steel pipe a.

[0029] Embodiment 2

[0030] The technical solution in this embodiment is basically the same as the technical solution in Embodiment 1, except that, in this embodiment, the locking mechanism includes a locking pin and a plurality of positioning holes evenly arranged along the circumference of the turntable 6, and the locking pin passes through one of the positioning holes and can be inserted into the workbench 1.

[0031] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0032] Although this article uses more terms such as steel pipe a, workbench 1, base 2, positioning clamp block 3, positioning groove 31, bending block 4, handle 4a, installation groove 41, roller 42, annular groove 421, fixed shaft 5, turntable 6, positioning column 7, compression spring 8, mold plate 9, matching groove 91, connecting rod 10, fixed rod 101, telescopic rod 102, slide groove 1021, tension spring 103, pressure cover 11, pressure rod 12, vertical rod 121, horizontal rod 122, handle 123, rubber block 124, hook 13, clamp 14, limit column 15, slide seat 16, slide seat 17, screw rod 18, hand wheel 19, pawl 20, ratchet 21, etc., it does not exclude the possibility of using other terms. The use of these terms is only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A tube bending device for cooling a mold steel tube, comprising a workbench (1) and a base (2) fixed on the workbench (1) and in the shape of an elongated strip, a positioning clamp (3) having a positioning groove (31) being fixedly connected to the rear end of the base (2), a tube bending block (4) having a handle (4a) being provided on one side of the positioning clamp (3), characterized in that: A fixed shaft (5) which is movable along the width direction of the base (2) and arranged vertically is slidably disposed on the workbench (1) near the rear end of the base (2); a turntable (6) is rotatably connected to the fixed shaft (5); the turntable (6) can be locked with the workbench (1) through a locking mechanism; a plurality of positioning columns (7) which are evenly arranged along the circumference of the turntable (6) are fixed to the upper surface of the turntable (6); each positioning column (7) is sequentially sleeved with a compression spring (8) and a fan-shaped template sheet (9) from bottom to top; each The radii of the support plates (9) are all different. Each support plate (9) is slidably matched with a corresponding positioning column (7) and is circumferentially positioned. The two ends of the compression spring (8) respectively abut against the lower surface of the corresponding support plate (9) and the upper surface of the turntable (6), and the spacing between the lower surface of the support plate (9) and the upper surface of the turntable (6) is greater than or equal to the thickness of the support plate (9). A retractable connecting rod (10) is provided below the turntable (6), one end of the connecting rod (10) is rotatably connected to the fixed shaft (5), and the bent pipe The block (4) is hinged on the other end of the connecting rod (10); the fixed shaft (5) is also detachably connected to a pressure cover (11), the pressure cover (11) is located above each support sheet (9), a pressure rod (12) is vertically slidably connected to the pressure cover (11), and a hook (13) for locking the pressure rod (12) is fixed on the upper surface of the pressure cover (11), and the pressure rod (12) can push one of the support sheets (9) downward and make the support sheet (9) abut against the upper surface of the turntable (6). At this time The template sheet (9) can cooperate with the bending block (4) to form a clamp (14) for bending the steel pipe (a); the pressure rod (12) includes a vertical rod portion (121) arranged in the vertical direction and a horizontal rod portion (122) arranged in the horizontal direction, the vertical rod portion (121) is slidably matched with the pressure cover (11) and the upper end is fixedly connected to the horizontal rod portion (122), the free end of the horizontal rod portion (122) is fixedly connected to a handle (123) arranged in the vertical direction, and the horizontal rod portion (122) can be clamped in the hook (13).

2. The tube bending device for mold cooling steel tube according to claim 1, characterized in that: A rubber block (124) is fixed to the lower end of the vertical rod portion (121).

3. The tube bending device for mold cooling steel tube according to claim 1 or 2, characterized in that: The connecting rod (10) comprises a fixed rod (101), a telescopic rod (102) and a tension spring (103); the telescopic rod (102) is provided with a slide groove (1021) arranged along the length direction; one end of the fixed rod (101) is rotatably connected to the fixed shaft (5); the other end of the fixed rod (101) is inserted into the slide groove (1021) and slidably cooperates with the telescopic rod (102); the tension spring (103) is located on one side of the telescopic rod (102) and arranged along the length direction of the telescopic rod (102); two ends of the tension spring (103) are respectively fixedly connected to the fixed rod (101) and the telescopic rod (102); and the bent pipe block (4) is hinged to the telescopic rod (102).

4. The tube bending device for mold cooling steel tube according to claim 1 or 2, characterized in that: A mounting groove (41) is provided on one side of the bending block (4), and a plurality of rollers (42) arranged along the length direction of the mounting groove (41) are rotatably connected in the mounting groove (41), and an annular groove (421) adapted to the outer diameter of the steel pipe (a) and having an arc-shaped cross section is provided on the outer peripheral surface of the roller (42), and a matching groove (91) adapted to the outer diameter of the steel pipe (a) and having an arc-shaped cross section is provided on the outer peripheral surface of each of the mold plates (9), and the matching groove (91) and the annular groove (421) are able to form the above-mentioned clamping opening (14) when facing each other.

5. The tube bending device for mold cooling steel tube according to claim 1 or 2, characterized in that: A limiting column (15) parallel to the length direction of the base (2) is fixed on one side of the positioning clamp (3), and the connecting rod (10) can be abutted against the limiting column (15) and is perpendicular to the length direction of the base (2).

6. The tube bending device for mold cooling steel tube according to claim 1 or 2, characterized in that: The cross section of the positioning column (7) is square or elliptical.

7. The tube bending device for mold cooling steel tube according to claim 1 or 2, characterized in that: A slide (16) is fixed on the workbench (1) near the rear end of the base (2), a track arranged along the width direction of the base (2) is provided in the slide (16), a slide seat (17) is slidably connected in the track, the fixed shaft (5) is vertically fixed on the slide seat (17), and a screw rod (18) is also rotatably connected to the slide seat (16), one end of the screw rod (18) is threadedly connected to the slide seat (17), and the other end of the screw rod (18) is rotatably connected to the slide seat (16) and extends out of the slide seat (17) and is fixed with a hand wheel (19).

8. The tube bending device for mold cooling steel tube according to claim 1 or 2, characterized in that: The locking mechanism comprises a pawl (20) hinged on the workbench (1) and a ratchet (21) arranged on the outer peripheral surface of the rotating disk (6); the pawl (20) is clamped on the ratchet (21) and enables the rotating disk (6) to be unidirectionally locked with the workbench (1) along a bending direction.

9. The tube bending device for mold cooling steel tube according to claim 1 or 2, characterized in that: The locking mechanism comprises a locking pin and a plurality of positioning holes evenly arranged along the circumference of the rotating disk (6); the locking pin passes through one of the positioning holes and can be inserted into the workbench (1).

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