A three-wire double-chain precision drawing machine

Abstract

The invention discloses a three-wire double-chain precision drawing machine, which relates to the field of mechanical processing, and comprises a frame, guide rods for guiding a drawing trolley are arranged on both sides of the frame, a driving chain for driving the drawing component to move is also arranged on the frame, a fixing frame is fixedly arranged at the rear end of the frame, a plurality of drawing die seats are arranged on the fixing frame, a drawing head of a pipe passes through the drawing die seat and is drawn by the drawing component, and the pipe is placed in a free component driven and adjusted by a support component; a plurality of free components are arranged on the support component, the free component comprises a core rod, a core head and a calibration jacket, the core head is arranged at one end of the core rod and extends to the inside of the pipe, the other end of the core rod passes through the calibration jacket and the support component, and the pipe is sleeved in the calibration jacket; the invention can reduce the problems of core penetration difficulty and drawing defects caused by the suspended bending of the pipe, and improve the overall drawing accuracy.

Description

Technical Field

[0001] The present application relates to the field of mechanical processing, and in particular to a three-wire double-chain precision drawing machine. Background Art

[0002] The three-wire double-chain drawing machine is a metal drawing equipment that uses double chains to simultaneously draw three tubes or bars to draw the metal material and change its diameter to meet the required diameter requirements. Especially when drawing larger or heavier workpieces, the double-chain system can provide a more uniform distribution of tension and reduce the risk of chain wear and breakage.

[0003] In the actual production process, the unevenness of the tube billet often produces a large uneven wall thickness defect on the inner wall of the tube. The corresponding wall thickness unevenness increases, and the uneven plastic flow causes the drawing force to fluctuate during the drawing process. In addition, since the drawn tube is long and has a large deflection, a centering deviation occurs during the drawing process of the tube, causing the tube to vibrate during the drawing process and gradually transmit along the tube, ultimately affecting the tube and affecting the drawing accuracy.

[0004] Therefore, it is necessary to provide a three-wire double-chain precision drawing machine to solve the problems raised in the above background technology. Summary of the invention

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions: a three-wire double-chain precision drawing machine, comprising a frame, guide rods for guiding a drawing trolley are arranged on both sides of the frame, a driving chain for driving the drawing trolley is also arranged on the frame, a fixed frame is fixedly arranged at the rear end of the frame, a plurality of drawing die seats are arranged on the fixed frame, a drawing head of a pipe passes through the drawing die seat and is drawn by the drawing trolley, and the pipe is placed in a free assembly driven and adjusted by a support assembly;

[0006] The free components are arranged in multiple numbers on the support component, and the free components include a core rod, a core head and a calibration sleeve. The core head is arranged at one end of the core rod and extends to the interior of the pipe, and the other end of the core rod passes through the calibration sleeve and the support component, and the pipe is sleeved in the calibration sleeve.

[0007] Preferably, the drawing trolley includes a movable frame, an adjustment rail, an adjustment platform, a drawing assembly and an adjuster. The movable frame is arranged on the frame, the adjustment rail is arranged on the movable frame, the adjustment platform is arranged in multiples, the adjuster control movement is arranged on the adjustment rail, and a drawing assembly is arranged on each of the adjustment platforms.

[0008] Preferably, the drawing assembly includes a connecting plate seat, a support platform, a clamp and a control rod, the support platform is fixed to the upper end surface of the adjustment platform through the connecting plate seat, and a clamp is provided at one end of the support platform facing the drawing die seat, and a control rod for controlling the clamp extends from the other end of the support platform.

[0009] Preferably, an adjusting motor is provided in the support platform, and the adjusting motor controls the movement of the control rod.

[0010] Preferably, the total length of the core rod and the core head is greater than the length of the pipe, and the length of the calibration jacket is equal to one third of the length of the pipe.

[0011] Preferably, the calibration sleeve comprises an extension sleeve, an outer sleeve, an inner sleeve and elastic claws, one end of the extension sleeve is provided with a fixed head for connecting to the support assembly, and the other end is connected to the inner sleeve, the outer sleeve is sleeved on the inner sleeve, and the elastic claws are evenly distributed around the circumference and embedded in the wall of the inner sleeve.

[0012] Preferably, the elastic claw is embedded from the outer wall of the inner sleeve toward the axial direction of the inner sleeve, and only the head of the elastic claw penetrates into the inner sleeve. The outer sleeve and the inner sleeve jointly fix the elastic claw, and the outer sleeve does not cover and restrict the outer side of the head of the elastic claw.

[0013] Preferably, the interior of the fixing head is hollow, the core head passes through the fixing head, and the connecting end faces of the fixing head and the extension sleeve restrict the pipe.

[0014] Preferably, the support assembly includes a placement box, a connecting seat, a support kit and a transmission, the connecting seat is fixed outside the placement box and fixedly connected to the fixed head, the support kit is arranged in the placement box close to the connecting seat, and the transmission is arranged in the placement box to separate the support kit.

[0015] Preferably, the connecting seat, the supporting kit and the transmission device are sequentially sleeved on the core rod to form an adjustment group, and three adjustment groups are evenly distributed in the placement box.

[0016] Compared with the prior art, the present application provides a three-wire double-chain precision drawing machine, which has the following beneficial effects:

[0017] In the present application, the pipe is inserted from the front end of the calibration jacket and reaches the bottom end of the calibration jacket, and then the core head is inserted from the inside of the support component through the bottom end of the calibration jacket into the inside of the pipe and reaches the drawing head, completing the pipe core;

[0018] The supporting assembly and the free assembly carry the pipe to move, so that the drawing head passes through the corresponding drawing die seat, the drawing trolley is driven by the driving chain to slide along the guide rod to approach the fixed frame, and the drawing trolley clamps the drawing head away from the fixed frame to draw the pipe;

[0019] During drawing, the support assembly moves synchronously so that the bottom end of the calibration jacket always supports the pipe. The support assembly stops moving until the front end of the calibration jacket approaches the drawing die seat. The working surface of the core head remains in a position corresponding to the sizing band of the drawing die seat. After the pipe is subjected to tension, the cross section passes through the annular gap formed between the core head and the drawing die seat, and a finished pipe with the same size as the gap is processed. With the help of the free assembly, the pipe is controlled to maintain sufficient centering during the feeding and core threading process and the drawing process, thereby reducing the core threading difficulties and drawing defects caused by the suspended bending of the pipe, and improving the overall drawing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0021] Figure 1 It is a schematic diagram of the overall structure of a three-wire double-chain precision drawing machine;

[0022] Figure 2 It is a schematic diagram of the position and structure of the drawing components in the initial stage of drawing in a three-wire double-chain precision drawing machine;

[0023] Figure 3 It is a schematic diagram of the position and structure of the free components in the late drawing stage of a three-wire double-chain precision drawing machine;

[0024] Figure 4 It is a schematic diagram of the structure of a calibration jacket in a three-wire double-chain precision drawing machine;

[0025] Figure 5 It is a schematic diagram of the structure of a support assembly in a three-wire double-chain precision drawing machine;

[0026] Figure 6 It is a schematic diagram of the internal structure of a support assembly in a three-wire double-chain precision drawing machine;

[0027] In the figure: 1. frame; 2. guide rod; 3. drawing trolley; 31. movable frame; 32. adjustment rail; 33. adjustment platform; 34. drawing assembly; 341. connecting plate seat; 342. support platform; 343. clamping claw; 344. control rod; 35. regulator; 4. driving chain; 5. fixed frame; 6. drawing die seat; 7. support assembly; 71. placement box; 72. connecting seat; 73. support kit; 74. transmission; 8. free assembly; 81. core rod; 82. core head; 83. calibration sleeve; 831. extension sleeve; 832. outer sleeve; 833. inner sleeve; 834. elastic claw; 835. fixed head; 9. pipe; 91. drawing head. DETAILED DESCRIPTION

[0028] See also Figure 1-Figure 6 In the embodiment of the present application, a three-wire double-chain precision drawing machine includes a frame 1, guide rods 2 for guiding the drawing assembly 34 are arranged on both sides of the frame 1, and a driving chain 4 for driving the drawing trolley 3 is also arranged on the frame 1. A fixed frame 5 is fixedly arranged at the rear end of the frame 1, and a plurality of drawing die seats 6 are arranged on the fixed frame 5. The drawing head 91 of the pipe 9 passes through the drawing die seat 6 and is drawn by the drawing trolley 3, and the pipe 9 is placed in a free assembly 8 driven and adjusted by a support assembly 7;

[0029] The free component 8 is arranged in multiple pieces on the support component 7, and the free component 8 includes a core rod 81, a core head 82 and a calibration sleeve 83. The core head 82 is arranged at one end of the core rod 81 and extends to the interior of the pipe 9. The other end of the core rod 81 passes through the calibration sleeve 83 and the support component 7, and the pipe 9 is sleeved in the calibration sleeve 83.

[0030] It should be explained that the pipe 9 is inserted into the calibration jacket 83 from the front end and reaches the bottom end of the calibration jacket 83, and then the core head 82 is inserted into the pipe 9 from the inside of the support assembly 7 through the bottom end of the calibration jacket 83 and reaches the drawing head 91, completing the core sleeve of the pipe 9;

[0031] The supporting assembly 7 and the free assembly 8 carry the tube 9 to move, so that the drawing head 91 passes through the corresponding drawing die seat 6, and the drawing trolley 3 slides along the guide rod 2 and approaches the fixed frame 5 under the drive of the driving chain 4, and the drawing trolley 3 clamps the drawing head 91 away from the fixed frame 5 to draw the tube 9;

[0032] During drawing, the support assembly 7 moves synchronously so that the bottom end of the calibration sleeve 83 always supports the pipe 9. The support assembly 7 stops moving until the front end of the calibration sleeve 83 is close to the drawing die seat 6. The working surface of the core head 82 remains at a position corresponding to the sizing band of the drawing die seat 6. After the pipe 9 is subjected to tension, the cross section passes through the annular gap formed between the core head 82 and the drawing die seat 6, and a finished pipe with the same size as the gap is processed.

[0033] As a preferred embodiment, the drawing trolley 3 includes a movable frame 31, an adjusting rail 32, an adjusting platform 33, a drawing assembly 34 and an adjuster 35. The movable frame 31 is arranged on the frame 1, the adjusting rail 32 is arranged on the movable frame 31, the adjusting platform 33 is arranged in multiple numbers, the adjuster 35 is movably arranged on the adjusting rail 32, and a drawing assembly 34 is arranged on each of the adjusting platforms 33.

[0034] It should be explained that when the drawing trolley 3 approaches the fixed frame 5 to draw the tube 9, the position of the adjustment platform 33 is adjusted by the regulator 35 so that the drawing assembly 34 corresponds to the position of the drawing die seat 6, and the drawing head 91 is clamped by the drawing assembly 34.

[0035] As a preferred embodiment, the drawing assembly 34 includes a connecting plate seat 341, a support platform 342, a clamp 343 and a control rod 344. The support platform 342 is fixed to the upper end surface of the adjustment platform 33 through the connecting plate seat 341, and the support platform 342 is provided with a clamp 343 at one end facing the drawing die seat 6, and a control rod 344 for controlling the clamp 343 extends from the other end of the support platform 342.

[0036] As a preferred embodiment, an adjusting motor is disposed in the support platform 342 , and the adjusting motor controls the movement of the control rod 344 .

[0037] It should be explained that when the drawing head 91 extends into the clamping jaws 343, the adjusting motor provides power to drive the control rod 344 to move, thereby driving the clamping jaws 343 to gather toward the middle to clamp the drawing head 91. After the tube 9 is pulled, the clamping jaws 343 are loosened by adjusting the control rod 344 to allow the processed tube 9 to be sent out.

[0038] As a preferred embodiment, the total length of the core rod 81 and the core head 82 is greater than the length of the pipe 9 , and the length of the calibration jacket 83 is equal to one third of the length of the pipe 9 .

[0039] It needs to be explained that the pipe 9 is inserted into the calibration jacket 83 to support the pipe 9 at a position close to the middle of the pipe 9, reducing the length of the suspended section of the pipe 9, so that the end of the pipe 9 maintains better centering, and the subsequent insertion of the core head 82 and the core rod 81 into the pipe 9 is sufficiently accurate. At the same time, during the drawing process of the pipe 9, the calibration jacket 83 follows the movement and always maintains support for the pipe 9, avoiding the pipe 9 from being suspended too long and causing it to tilt when drawing at the drawing die seat 6, thereby affecting the accuracy.

[0040] As a preferred embodiment, the calibration sleeve 83 includes an extension sleeve 831, an outer sleeve 832, an inner sleeve 833 and an elastic claw 834. One end of the extension sleeve 831 is provided with a fixed head 835 for connecting to the support assembly 7, and the other end is connected to the inner sleeve 833. The outer sleeve 832 is sleeved on the inner sleeve 833, and the elastic claws 834 are evenly distributed around the circumference and embedded in the wall of the inner sleeve 833.

[0041] As a preferred embodiment, the elastic claw 834 is embedded from the outer wall of the inner sleeve 833 toward the axial direction of the inner sleeve 833, and only the head of the elastic claw 834 penetrates into the inner sleeve 833. The outer sleeve 832 and the inner sleeve 833 jointly fix the elastic claw 834, and the outer sleeve 832 does not cover and restrict the outer side of the head of the elastic claw 834.

[0042] As a preferred embodiment, the interior of the fixing head 835 is hollow, and the core head 82 passes through the fixing head 835 , and the connecting end faces of the fixing head 835 and the extension sleeve 831 restrict the pipe 9 .

[0043] It should be explained that after the tube 9 is inserted into the inner sleeve 833, the end of the elastic claw 834 is squeezed, causing the elastic claw 834 to bend and slide down the outer wall of the tube 9. The deformation force of the elastic claw 834 causes the tube 9 to remain in the center position, and at the same time, the tube 9 is supported by the elastic claw 834.

[0044] As a preferred embodiment, the support assembly 7 includes a placement box 71, a connecting seat 72, a support kit 73 and a transmission 74. The connecting seat 72 is fixed outside the placement box 71 and fixedly connected to the fixed head 835. The support kit 73 is arranged in the placement box 71 close to the connecting seat 72. The transmission 74 is arranged in the placement box 71 to separate the support kit 73.

[0045] As a preferred embodiment, the connecting seat 72 , the supporting kit 73 and the transmission device 74 are sequentially sleeved on the core rod 81 to form an adjustment group, and three adjustment groups are evenly distributed in the placement box 71 .

[0046] It should be explained that, during the core threading process, the core head 82 abuts against the end surface of the support sleeve 73, the core head 82 and the core rod 81 are both located in the support assembly 7, and although most of the core rod 81 extends outside the support assembly 7 to generate a large deflection, the support of the support sleeve 73 and the transmission device 74 can ensure that the portion of the core rod 81 connecting the core head 82 is sufficiently centered;

[0047] The core rod 81 is driven to slide by the transmission device 74, so that the core head 82 passes through the connecting seat 72 and the fixing head 835 and enters the interior of the pipe 9 to complete the core insertion smoothly;

[0048] After the tube 9 is pulled out, the support assembly 7 moves away from the fixing frame 5 as a whole, and the core rod 81 is driven to slide in the opposite direction by the transmission device 74, so that the core head 82 returns to the support assembly 7 to wait for the subsequent core threading of other tubes 9.

[0049] In the specific implementation, the pipe 9 is inserted into the calibration jacket 83 from the front end and reaches the bottom end of the calibration jacket 83, and then the core head 82 is inserted into the pipe 9 from the inside of the support assembly 7 through the bottom end of the calibration jacket 83 and reaches the drawing head 91, completing the core wrapping of the pipe 9;

[0050] The supporting assembly 7 and the free assembly 8 carry the tube 9 to move, so that the drawing head 91 passes through the corresponding drawing die seat 6, and the drawing trolley 3 is driven by the driving chain 4 to slide along the guide rod 2 and approach the fixed frame 5, and the drawing trolley 3 clamps the drawing head 91 away from the fixed frame 5 to draw the tube 9;

[0051] During drawing, the support assembly 7 moves synchronously so that the bottom end of the calibration sleeve 83 always supports the pipe 9. The support assembly 7 stops moving until the front end of the calibration sleeve 83 is close to the drawing die seat 6. The working surface of the core head 82 is maintained at a position corresponding to the sizing band of the drawing die seat 6. After the pipe 9 is subjected to tension, the cross section passes through the annular gap formed between the core head 82 and the drawing die seat 6, and a finished pipe 9 with the same size as the gap is processed. With the help of the free assembly 8, the pipe 9 is controlled to maintain sufficient centering during the feeding and core threading process and the drawing process, thereby reducing the core threading difficulties and drawing defects caused by the suspended bending of the pipe 9, and improving the overall drawing accuracy.

[0052] What has been described above is only a preferred specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes within the technical scope disclosed in the present application according to the technical solution and application concept of the present application, which should be covered by the protection scope of the present application.

Claims

1. A three-wire double-chain precision drawing machine, characterized in that: It comprises a frame (1), on both sides of which are provided guide rods (2) for guiding a drawing trolley (3), the frame (1) is also provided with a driving chain (4) for driving the drawing trolley (3) to move, a fixed frame (5) is fixedly provided at the rear end of the frame (1), a plurality of drawing die seats (6) are arranged on the fixed frame (5), a drawing head (91) of a pipe (9) passes through the drawing die seat (6) and is drawn by the drawing trolley (3), and the pipe (9) is placed in a free assembly (8) driven and adjusted by a support assembly (7); The free assembly (8) is arranged in plurality on the support assembly (7), and the free assembly (8) comprises a core rod (81), a core head (82) and a calibration jacket (83), wherein the core head (82) is arranged at one end of the core rod (81) and extends into the interior of the pipe (9), the other end of the core rod (81) passes through the calibration jacket (83) and the support assembly (7), and the pipe (9) is sleeved in the calibration jacket (83); The calibration sleeve (83) comprises an extension sleeve (831), an outer sleeve (832), an inner sleeve (833) and an elastic claw (834); one end of the extension sleeve (831) is provided with a fixed head (835) for connecting to the support assembly (7), and the other end is connected to the inner sleeve (833); the outer sleeve (832) is sleeved on the inner sleeve (833), and the elastic claw (834) is evenly distributed around the circumference and embedded in the wall of the inner sleeve (833); The elastic claw (834) is embedded from the outer wall of the inner sleeve (833) toward the axial direction of the inner sleeve (833), and only the head of the elastic claw (834) penetrates into the inner sleeve (833). The outer sleeve (832) and the inner sleeve (833) jointly fix the elastic claw (834), and the outer sleeve (832) does not sleeve and restrict the outer side of the head of the elastic claw (834); The interior of the fixing head (835) is hollow, and the core head (82) passes through the fixing head (835) and the connecting end surface of the extension sleeve (831) to restrict the pipe (9); In a specific implementation, the pipe (9) is inserted into the calibration jacket (83) from the front end and reaches the bottom end of the calibration jacket (83), and then the core head (82) is inserted into the pipe (9) from the inside of the support assembly (7) through the bottom end of the calibration jacket (83) and reaches the drawing head (91), thereby completing the core sleeve of the pipe (9); The supporting assembly (7) and the free assembly (8) carry the tube (9) to move, so that the drawing head (91) passes through the corresponding drawing die seat (6), and the drawing trolley (3) is driven by the driving chain (4) to slide along the guide rod (2) and approach the fixed frame (5), and the drawing trolley (3) clamps the drawing head (91) away from the fixed frame (5) to pull the tube (9).

2. A three-wire double-chain precision drawing machine according to claim 1, characterized in that: The drawing trolley (3) comprises a movable frame (31), an adjustment rail (32), an adjustment platform (33), a drawing assembly (34) and an adjuster (35); the movable frame (31) is arranged on the frame (1); the adjustment rail (32) is arranged on the movable frame (31); the adjustment platform (33) is arranged in plurality; the adjuster (35) controls the movement and is arranged on the adjustment rail (32); and each adjustment platform (33) is provided with a drawing assembly (34).

3. A three-wire double-chain precision drawing machine according to claim 2, characterized in that: The drawing assembly (34) comprises a connecting plate seat (341), a support platform (342), a clamping jaw (343) and a control rod (344); the supporting platform (342) is fixed to the upper end surface of the adjusting platform (33) through the connecting plate seat (341); and a clamping jaw (343) is provided at one end of the supporting platform (342) facing the drawing die seat (6); and a control rod (344) for controlling the clamping jaw (343) extends from the other end of the supporting platform (342).

4. A three-wire double-chain precision drawing machine according to claim 3, characterized in that: An adjusting motor is arranged inside the support platform (342), and the adjusting motor controls the movement of the control rod (344).

5. The three-wire double-chain precision drawing machine according to claim 1, characterized in that: The total length of the core rod (81) and the core head (82) is greater than the length of the pipe (9), and the length of the calibration jacket (83) is equal to one third of the length of the pipe (9).

6. A three-wire double-chain precision drawing machine according to claim 1, characterized in that: The support assembly (7) comprises a placement box (71), a connecting seat (72), a support kit (73) and a transmission (74); the connecting seat (72) is fixed outside the placement box (71) and fixedly connected to the fixed head (835); the support kit (73) is arranged in the placement box (71) close to the connecting seat (72); and the transmission (74) is arranged in the placement box (71) at a distance from the support kit (73).

7. A three-wire double-chain precision drawing machine according to claim 6, characterized in that: The connecting seat (72), the supporting set (73) and the transmission device (74) are sequentially sleeved on the core rod (81) to form an adjustment group, and three adjustment groups are evenly distributed in the placement box (71).

8. The three-wire double-chain precision drawing machine according to claim 1, characterized in that: During drawing, the support assembly (7) moves synchronously so that the bottom end of the calibration sleeve (83) always supports the pipe (9). The support assembly (7) stops moving until the front end of the calibration sleeve (83) approaches the drawing die seat (6). The working surface of the core head (82) is maintained at a position corresponding to the sizing band of the drawing die seat (6). After the pipe (9) is subjected to tension, the cross section passes through the annular gap formed between the core head (82) and the drawing die seat (6), and a finished pipe (9) having the same size as the gap is processed. The free assembly (8) is used to control the pipe (9) to always remain centered during the feeding, core passing and drawing process.

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