Flaring clamping and locking die for automobile exhaust system

Abstract

The invention provides a flaring clamping and locking die for an automobile exhaust system. The flaring clamping and locking die comprises a clamping die for fixing a pipe fitting and a flaring device opposite to the clamping die. The clamping die comprises an upper die plate and a lower die plate, an upper groove is formed in the side, close to the lower die plate, of the upper die plate, and a lower groove is formed in the side, close to the upper die plate, of the lower die plate. The flaring device comprises an ejector rod arranged on one side of the clamping die and a flaring rod arranged on the side, away from the ejector rod, of the clamping die. The ejector rod abuts against the pipe fitting clamped by the clamping die, and the flaring rod flares the pipe fitting. The flaring rod is provided with a clamping and locking boss, the upper groove and the lower groove abut against each other to form a clamping cavity, and the clamping cavity is provided with a clamping and locking groove corresponding to the clamping and locking boss. The butt joint precision of the pipe fittings is improved, the follow-up welding process is facilitated, the welding quality is improved, the stress of the welding part can be dispersed, the follow-up cracking possibility is reduced, and waste gas leakage is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of exhaust pipe production, and in particular relates to a flaring and locking die for an automobile exhaust system. Background Art

[0002] The exhaust system is a key part of a car or other internal combustion engine equipment, usually including exhaust manifold, catalytic converter, muffler, exhaust tail pipe and other parts. The above multiple pipes have different diameters. The traditional method is to expand the opening of the small diameter pipe to the same thickness as the large diameter pipe and then weld it. However, the above installation method requires high docking accuracy and good welding technology. Otherwise, exhaust gas leakage is likely to occur, causing harm to drivers and passengers, affecting the working efficiency of the exhaust system, increasing noise, and causing engine power to decrease.

[0003] Therefore, the above problems need to be solved urgently. Summary of the invention

[0004] Purpose of the invention: In order to overcome the above shortcomings, the present invention provides a flaring and locking mold for an automobile exhaust system, which improves the docking accuracy of pipe fittings, facilitates subsequent welding processes, improves welding quality, and can disperse the stress-bearing parts of pipe fittings, reduce the possibility of subsequent cracking, and avoid exhaust gas leakage.

[0005] Technical solution: In order to achieve the above-mentioned purpose, the present invention provides a flaring locking mold for automobile exhaust system, including a clamping mold for fixing pipe fittings, and a flaring device arranged opposite to the clamping mold. The clamping mold includes an upper mold plate and a lower mold plate, and the upper mold plate is provided with an upper groove on the side close to the lower mold plate, and the lower mold plate is provided with a lower groove on the side close to the upper mold plate. The flaring device includes a push rod provided on one side of the clamping mold, and a flaring rod provided on the side of the clamping mold away from the push rod. The push rod abuts against the pipe fitting clamped by the clamping mold, and the flaring rod flares the pipe fitting. The flaring rod is provided with a locking boss, and the upper groove and the lower groove abut to form a clamping cavity, and the clamping cavity is provided with a locking groove corresponding to the locking boss. During the use of the present invention, the clamping die clamps the pipe fitting between the upper groove and the lower groove, the top rod abuts against the pipe fitting, and then the flaring rod extends toward the pipe fitting to flare the pipe fitting. At this time, the locking boss squeezes part of the pipe fitting into the locking groove, so that the pipe fitting forms a bulge. The butt joint pipeline is provided with a corresponding concave portion. When the pipe fitting is butt jointed, the bulge on the pipe fitting corresponds to the concave portion of the large-diameter pipeline. The pipe fitting is inserted into the opening of the large-diameter pipeline, and the bulge on the pipe fitting and the concave portion of the large-diameter pipeline are locked, and then the pipe fitting is welded. The present invention improves the butt joint accuracy of the pipe fitting, facilitates the subsequent welding process, improves the welding quality, and can disperse the force on the pipe fitting, reduce the possibility of subsequent cracking, and avoid exhaust gas leakage.

[0006] Furthermore, in the above-mentioned automobile exhaust system expansion locking mold, the locking groove is spirally arranged around the inner wall of the clamping cavity. The expansion rod is provided with a multi-step step with a smooth transition near one end of the clamping mold, and the locking boss is spirally arranged around the multi-step step, and the locking boss and the locking groove are arranged accordingly. The locking boss and the locking groove are set to corresponding spiral shapes, so that the protrusion formed after the expansion is spiral, and the pipe fittings are connected by spirals to increase the contact area of ​​the butt pipe fittings, improve the stability of the connection of the butt pipe fittings, avoid stress concentration on the welding part after the butt, and reduce the possibility of cracking caused by subsequent vibration.

[0007] Furthermore, in the above-mentioned automobile exhaust system expansion and locking mold, a guide boss is provided near one end of the expansion rod in the clamping cavity, and a guide groove is provided on the guide boss, and the guide groove guides the locking boss into the locking groove. The guide groove is set to be trumpet-shaped, and during the expansion process, the locking boss first enters the trumpet-shaped guide groove, and enters the locking groove under the guidance of the guide groove to perform the expansion process, thereby improving the expansion accuracy and avoiding the collision of the locking boss and causing damage to the mold.

[0008] Furthermore, in the above-mentioned automobile exhaust system expansion locking mold, the locking boss gradually lowers toward the clamping mold. The locking boss gradually lowers, and the boss formed after the expansion gradually rises. When docking, docking starts from the lower boss, which can guide the butt joint fittings to be coaxial, improve docking accuracy, and improve connection stability.

[0009] Furthermore, in the above-mentioned automobile exhaust system flaring locking mold, the flaring device is slidably connected to the top surface of the bottom plate. A flaring drive device is provided on the side of the flaring rod away from the clamping mold, and the flaring drive device pushes the flaring rod to move in the direction of the clamping mold, and the flaring rod flares the pipe fitting. A push rod drive device is provided on the side of the ejector rod away from the clamping mold, and the ejector rod drive device drives the ejector rod to make the ejector rod and the pipe fitting abut. The flaring drive device and the ejector rod drive device are configured as linear drive devices, which can accurately control the moving distance of the flaring rod and the ejector rod to avoid damage to the mold caused by over-positioning during the flaring process.

[0010] Furthermore, in the above-mentioned automobile exhaust system flaring locking mold, the flaring device includes a first base and a second base, the first base is connected to a flange seat, the flaring rod shaft is movably connected to the flange seat, a spring is connected between the flaring rod and the flange seat, one end of the spring is connected to the flaring rod, and the other end of the spring is connected to the flange seat. The second base is connected to the push rod. The flaring rod shaft is movably connected to the flange seat, and as the flaring work proceeds, the flaring rod extends, the locking boss enters the locking groove, the flaring rod rotates, and the spring rotates and twists. After the flaring is completed, the flaring rod retracts, the locking boss exits the locking groove, the flaring rod rotates in the opposite direction, the spring resets, and the flaring rod returns to the initial position. The above-mentioned arrangement can ensure that the flaring rod can be in the initial state after retraction, avoid the flaring rod from shifting, causing the locking boss to be unable to enter the locking groove, and ensure the stability of the mold.

[0011] Furthermore, in the above-mentioned automobile exhaust system expansion locking mold, the first base is connected to a first screw rod, the first screw rod is connected to the flange seat by driving, the first screw rod is connected to a first motor, the first motor drives the first screw rod to rotate, the first screw rod is connected to a loading device by driving, and the loading device is slidably connected to the first base. The second base is provided with a second screw rod, the second screw rod is connected to the top rod by driving, the second screw rod is connected to a second motor, the second motor drives the second screw rod to rotate, the second screw rod is connected to a unloading device by driving, and the unloading device is slidably connected to the second base. When loading is required, the first motor drives the first screw rod to rotate, the first screw rod drives the loading device to move to the silo, and after the loading device takes the pipe fitting, the first screw rod drives the loading device to move to the clamping mold for expansion. After the expansion is completed, the second motor drives the second screw rod to rotate, the second screw rod drives the unloading device to move to the clamping mold, the unloading device takes the expanded pipe fitting, and the second motor reverses to drive the unloading device to the unloading silo for unloading. By setting a loading device and a unloading device, automatic loading and unloading can be realized, the expansion operation is automated, the production efficiency is improved, and the production cost is reduced.

[0012] Furthermore, in the above-mentioned automobile exhaust system expansion locking mold, the feeding device includes a first square plate drivingly connected to the first screw rod, the first square plate is connected to a feeding slide rail, the feeding slide rail is vertically arranged, the feeding slide rail is slidably connected to a first push plate, the first push plate is connected to a first bushing, the first bushing shaft is slidably connected to a feeding rod, the first push plate is connected to a first cylinder on the side away from the feeding rod, the cylinder shaft of the first cylinder passes through the first push plate and is drivingly connected to the feeding rod. A second cylinder is provided at the lower side of the first push plate, the cylinder shaft of the second cylinder is vertically arranged, and the second cylinder is drivingly connected to the first push plate. When loading is needed, the first motor drives the loading device to move to the material bin, the second cylinder drives the first push plate to move down along the loading slide rail, and then the first cylinder drives the loading rod to extend from the first bushing, and the loading rod extends into the through hole of the material pipe, and then the second cylinder drives the first push plate to move up along the loading slide rail, the first motor drives the loading device to move to the clamping mold, the first cylinder drives the loading rod to retract, and the pipe falls into the lower groove to wait for expansion. Loading is achieved by the cooperation of the cylinder and the loading rod, which has a compact structure, is easy to implement, and has a low failure rate.

[0013] Furthermore, in the above-mentioned automobile exhaust system expansion locking mold, the blanking device includes a second square plate drivingly connected to the second screw rod, the second square plate is connected to a blanking slide rail, the blanking slide rail is vertically arranged, the blanking slide rail is slidably connected to a second push plate, the second push plate is connected to a second bushing, the second bushing shaft is slidably connected to a blanking rod, the second push plate is connected to a third cylinder on the side away from the blanking rod, the cylinder shaft of the third cylinder passes through the second push plate and is drivingly connected to the blanking rod. A fourth cylinder is provided at the lower side of the second push plate, the cylinder shaft of the fourth cylinder is vertically arranged, and the fourth cylinder is drivingly connected to the second push plate. When unloading is needed, the second motor drives the unloading device to move to the clamping mold, the fourth cylinder drives the second push plate to move down along the unloading slide rail, and then the third cylinder drives the unloading rod to extend from the second bushing, and the unloading rod extends into the through hole of the expanded material pipe, and then the fourth cylinder drives the second push plate to move up along the unloading slide rail, the second motor drives the unloading device to move to the unloading bin, and the third cylinder drives the unloading rod to retract, and the pipe fittings fall into the unloading bin. Unloading is achieved by the cooperation of the cylinder and the loading rod, which has a compact structure, is easy to implement, and has a low failure rate.

[0014] Furthermore, in the above-mentioned automobile exhaust system expansion locking mold, a clamping cylinder is provided on the upper side of the upper mold plate, and the clamping cylinder is drive-connected to the upper mold plate. The clamping cylinder presses the upper mold plate against the top surface of the lower mold plate to avoid movement of the pipe fittings during the expansion process, thereby improving the expansion quality and reducing the amount of waste.

[0015] It can be seen from the above technical scheme that the present invention has the following beneficial effects: the automobile exhaust system flaring locking mold of the present invention makes the formed pipe fittings have bulges through the locking boss, which can improve the pipe fitting docking accuracy, facilitate the subsequent welding process, and improve the welding quality. The locking boss and the locking groove are set to corresponding spiral shapes, and the pipe fittings are connected by spirals to increase the contact area of ​​the butt joint fittings, improve the stability of the butt joint fitting connection, avoid stress concentration on the welding part, and reduce the possibility of cracking caused by subsequent vibration. Automatic loading and unloading are realized by setting a loading device and a unloading device, and the flaring operation is automated, which improves production efficiency and reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the expansion and locking mold of the automobile exhaust system of the present invention; Figure 2 is a front view of the clamping die and the pressing cylinder; Figure 3 is a cross-sectional view of the clamping mold; Figure 4 is a top view of the expanding device; Figure 5 for Figure 4 A partial enlarged view of Figure 6 is a structural schematic diagram of the feeding device; Figure 7 It is a structural schematic diagram of the feeding device.

[0017] In the figure: 1, clamping mold, 11, upper template, 12, lower template, 111, upper groove, 121, lower groove, 113, clamping cavity, 1131, guide boss, 1132, guide groove, 13, multi-step, 131, locking boss, 114, threaded groove, 115, clamping cylinder, 2, flaring device, 21, ejector rod, 22, flaring rod, 23, flange seat, 3, bottom plate, 4, flaring drive device, 5, ejector drive device, 6, first base, 61, first screw rod, 6 2. The first motor, 63. The loading device, 631. The first square plate, 632. The loading slide rail, 633. The first bushing, 634. The loading rod, 635. The first cylinder, 636. The second cylinder, 637. The first push plate, 7. The second base, 71. The second screw rod, 72. The second motor, 73. The unloading device, 731. The second square plate, 732. The unloading slide rail, 733. The second bushing, 734. The unloading rod, 735. The third cylinder, 736. The fourth cylinder, 737. The second push plate. DETAILED DESCRIPTION

[0018] Example 1 like Figure 1-5 The illustrated embodiment of a flaring locking mold for an automobile exhaust system comprises a clamping mold 1 for fixing a pipe fitting, and a flaring device 2 arranged opposite to the clamping mold 1. The clamping mold 1 comprises an upper mold plate 11 and a lower mold plate 12, wherein an upper groove 111 is provided on the side of the upper mold plate 11 close to the lower mold plate 12, and a lower groove 121 is provided on the side of the lower mold plate 12 close to the upper mold plate 11. The flaring device 2 comprises a push rod 21 provided on one side of the clamping mold 1, and a flaring rod 22 provided on the side of the clamping mold 1 away from the push rod 21. The push rod 21 abuts against the pipe fitting clamped by the clamping mold 1, and the flaring rod 22 flares the pipe fitting. The flaring rod 22 is provided with a flaring boss 131, and the upper groove 111 and the lower groove 121 abut against each other to form a clamping cavity 113, and the clamping cavity 113 is provided with a flaring groove 114 corresponding to the flaring boss 131.

[0019] The locking groove 114 is spirally arranged around the inner wall of the clamping cavity 113. The end of the flaring rod 22 close to the clamping mold 1 is provided with a multi-step step 13 with a smooth transition, and the locking boss 131 is spirally arranged around the multi-step step 13, and the locking boss 131 and the locking groove 114 are arranged accordingly. The clamping cavity 113 is provided with a guide boss 1131 close to the end of the flaring rod 22, and the guide boss 1131 is provided with a guide groove 1132, and the guide groove 1132 guides the locking boss 131 into the locking groove 114. The guide groove 1132 is set to be trumpet-shaped. The locking boss 131 gradually lowers toward the clamping mold 1. The flaring device 2 is slidably connected to the top surface of the bottom plate 3. The flaring rod 22 is provided with a flaring drive device 4 on the side away from the clamping mold 1, and the flaring drive device 4 pushes the flaring rod 22 to move toward the clamping mold 1, and the flaring rod 22 flares the pipe fitting. A push rod driving device 5 is provided on the side of the push rod 21 away from the clamping mold 1, and the push rod driving device 5 drives the push rod 21 so that the push rod 21 abuts against the pipe fitting. The expansion drive device 4 and the push rod driving device 5 are configured as linear drive devices. The expansion device 2 comprises a first base 6 and a second base 7, the first base 6 is connected to a flange seat 23, the expansion rod 22 is axially movably connected to the flange seat 23, a spring is connected between the expansion rod 22 and the flange seat 23, one end of the spring is connected to the expansion rod 22, and the other end of the spring is connected to the flange seat 23. The second base 7 is connected to the push rod 21. The first base 6 is connected to a first screw rod 61, the first screw rod 61 is drivingly connected to the flange seat 23, the first screw rod 61 is connected to a first motor 62, the first motor 62 drives the first screw rod 61 to rotate, the first screw rod 61 is drivingly connected to a feeding device 63, and the feeding device 63 is slidably connected to the first base 6. The second base 7 is provided with a second screw rod 71, which is drivingly connected to the top rod 21, and the second screw rod 71 is connected to a second motor 72, which drives the second screw rod 71 to rotate, and the second screw rod 71 is drivingly connected to a feeding device 73, and the feeding device 73 is slidably connected to the second base 7. A pressing cylinder 115 is provided on the upper side of the upper template 11, and the pressing cylinder 115 is drivingly connected to the upper template 11, and the pressing cylinder 115 presses the upper template 11 against the top surface of the lower template 12.

[0020] During the use of the present invention, the first motor 62 drives the first screw 61 to rotate, and the first screw 61 drives the loading device 63 to move to the material bin. After the loading device 63 takes the pipe fitting, the first screw 61 drives the loading device 63 to move to the clamping mold 1, and the loading device 63 puts the material into the lower groove 121, and the clamping cylinder 115 presses the upper template 11 against the top surface of the lower template 12 to clamp the pipe material. The ejector drive device 5 drives the ejector 21 to extend, and the flaring drive device 4 drives the flaring rod 22 to extend, the ejector 21 abuts against the pipe fitting, and then the flaring rod 22 flares the pipe fitting. The flaring process includes: the locking boss 131 extends into the guide groove 1132, the locking boss 131 enters the locking groove 114 along the guide groove 1132, the flaring rod 22 rotates at the same time, and the spring rotates and twists. After the expansion is completed, the expansion drive device 4 drives the expansion rod 22 to retract, the locking boss 131 exits the locking groove 114, and the expansion rod 22 rotates in the opposite direction, the spring resets, and the expansion rod 22 returns to the initial position. The second motor 72 drives the unloading device 73 to move to the clamping mold 1 through the second screw rod 71, and the unloading device 73 takes the expanded pipe fittings. The second motor 72 reverses to drive the unloading device 73 to the unloading bin to unload the material.

[0021] like Figure 6 The illustrated automobile exhaust system expansion locking mold, the feeding device 63 includes a first square plate 631 drivingly connected to the first screw rod 61, the first square plate 631 is connected to a feeding slide rail 632, the feeding slide rail 632 is vertically arranged, the feeding slide rail 632 is slidably connected to a first push plate 637, the first push plate 637 is connected to a first bushing 633, the first bushing 633 is axially slidably connected to a feeding rod 634, the first push plate 637 is connected to a first cylinder 635 on the side away from the feeding rod 634, the cylinder shaft of the first cylinder 635 passes through the first push plate 637 and is drivingly connected to the feeding rod 634. A second cylinder 636 is provided at the lower side of the first push plate 637, the cylinder shaft of the second cylinder 636 is vertically arranged, and the second cylinder 636 and the first push plate 637 are drivingly connected. When loading is needed, the first motor 62 drives the loading device 63 to move to the silo, the second cylinder 636 drives the first push plate 637 to move downward along the loading slide rail 632, and then the first cylinder 635 drives the loading rod 634 to extend from the first bushing 633, the loading rod 634 extends into the through hole of the material pipe, and then the second cylinder 636 drives the first push plate 637 to move upward along the loading slide rail 632, the first motor 62 drives the loading device 63 to move to the clamping mold 1, the first cylinder 635 drives the loading rod 634 to retract, and the pipe falls into the lower groove 12 to wait for expansion.

[0022] like Figure 7The automobile exhaust system expansion locking mold shown, the blanking device 73 includes a second square plate 731 drivingly connected to the second screw rod 71, the second square plate 731 is connected to a blanking slide rail 732, the blanking slide rail 732 is vertically arranged, the blanking slide rail 732 is slidably connected to a second push plate 737, the second push plate 737 is connected to a second bushing 733, the second bushing 733 is axially slidably connected to a blanking rod 734, the second push plate 737 is connected to a third cylinder 735 on the side away from the blanking rod 734, the cylinder shaft of the third cylinder 735 passes through the second push plate 737 and is drivingly connected to the blanking rod 734. A fourth cylinder 736 is provided at the lower side of the second push plate 737, the cylinder shaft of the fourth cylinder 736 is vertically arranged, and the fourth cylinder 736 is drivingly connected to the second push plate 737. When unloading is required, the second motor 72 drives the unloading device 73 to move to the clamping mold 1, the fourth cylinder 736 drives the second push plate 737 to move downward along the unloading slide rail 732, and then the third cylinder 735 drives the unloading rod 734 to extend from the second bushing 733, and the unloading rod 734 extends into the through hole of the expanded material pipe, and then the fourth cylinder 736 drives the second push plate 737 to move upward along the unloading slide rail 732, the second motor 72 drives the unloading device 73 to move to the unloading bin, the third cylinder 735 drives the unloading rod 734 to retract, and the pipe falls into the unloading bin.

[0023] The above embodiments are exemplary, and their purpose is to illustrate the technical concept and features of the present invention so that people familiar with this field can understand the content of the present invention and implement it accordingly, and they cannot limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A car exhaust system expansion and locking mold, characterized by: The invention comprises a clamping die (1) for fixing a pipe fitting, and an expanding device (2) arranged opposite to the clamping die (1); the clamping die (1) comprises an upper die plate (11) and a lower die plate (12); an upper groove (111) is provided on a side of the upper die plate (11) close to the lower die plate (12); and a lower groove (121) is provided on a side of the lower die plate (12) close to the upper die plate (11); the expanding device (2) comprises a push rod (21) arranged on one side of the clamping die (1). , and a flaring rod (22) disposed on a side of the clamping die (1) away from the push rod (21); the push rod (21) abuts against a pipe clamped by the clamping die (1), and the flaring rod (22) flares the pipe; the flaring rod (22) is provided with a locking boss (131), the upper groove (111) and the lower groove (121) abut against each other to form a clamping cavity (113), and the clamping cavity (113) is provided with a locking groove (114) corresponding to the locking boss (131).

2. The automobile exhaust system expansion and locking mold according to claim 1, characterized in that: The locking groove (114) is spirally arranged around the inner wall of the clamping cavity (113); the flaring rod (22) is provided with a multi-step step (13) with a smooth transition at one end close to the clamping mold (1); the locking boss (131) is spirally arranged around the multi-step step (13); and the locking boss (131) and the locking groove (114) are arranged correspondingly.

3. The automobile exhaust system expansion and locking mold according to claim 1, characterized in that: The clamping cavity (113) is provided with a guide boss (1131) at one end close to the flaring rod (22), and the guide boss (1131) is provided with a guide groove (1132), and the guide groove (1132) guides the locking boss (131) to enter the locking groove (114).

4. The automobile exhaust system expansion and locking mold according to claim 1, characterized in that: The locking boss (131) gradually descends towards the clamping mold (1).

5. The automobile exhaust system expansion and locking mold according to claim 1, characterized in that: The expanding device (2) is slidably connected to the top surface of the bottom plate (3); a expanding drive device (4) is provided on the side of the expanding rod (22) away from the clamping die (1); the expanding drive device (4) pushes the expanding rod (22) to move in the direction of the clamping die (1), and the expanding rod (22) expands the pipe fitting; a push rod drive device (5) is provided on the side of the push rod (21) away from the clamping die (1); the push rod drive device (5) drives the push rod (21) so that the push rod (21) and the pipe fitting are in contact.

6. The automobile exhaust system expansion and locking mold according to claim 1, characterized in that: The expanding device (2) comprises a first base (6) and a second base (7); the first base (6) is connected to a flange seat (23); the expanding rod (22) is axially movably connected to the flange seat (23); a spring is connected between the expanding rod (22) and the flange seat (23); and the second base (7) is connected to a push rod (21).

7. The automobile exhaust system expansion and locking mold according to claim 6, characterized in that: The first base (6) is connected to a first screw rod (61), the first screw rod (61) is drivingly connected to the flange seat (23), the first screw rod (61) is connected to a first motor (62), the first motor (62) drives the first screw rod (61) to rotate, the first screw rod (61) is drivingly connected to a loading device (63), the loading device (63) is slidably connected to the first base (6); the second base (7) is provided with a second screw rod (71), the second screw rod (71) is drivingly connected to the ejector rod (21), the second screw rod (71) is connected to a second motor (72), the second motor (72) drives the second screw rod (71) to rotate, the second screw rod (71) is drivingly connected to a unloading device (73), the unloading device (73) is slidably connected to the second base (7).

8. The automobile exhaust system expansion and locking mold according to claim 7, characterized in that: The feeding device (63) comprises a first square plate (631) drivingly connected to the first screw rod (61); the first square plate (631) is connected to a feeding slide rail (632); the feeding slide rail (632) is vertically arranged; the feeding slide rail (632) is slidably connected to a first push plate (637); the first push plate (637) is connected to a first bushing (633); the first bushing (633) is slidably connected to a feeding rod (634); the first push plate (637) is connected to a first cylinder (635) on a side away from the feeding rod (634); the cylinder shaft of the first cylinder (635) passes through the first push plate (637) and is drivingly connected to the feeding rod (634); a second cylinder (636) is provided on the lower side of the first push plate (637); the cylinder shaft of the second cylinder (636) is vertically arranged; the second cylinder (636) and the first push plate (637) are drivingly connected.

9. The automobile exhaust system expansion and locking mold according to claim 7, characterized in that: The unloading device (73) comprises a second square plate (731) drivingly connected to the second screw rod (71); the second square plate (731) is connected to a unloading slide rail (732); the unloading slide rail (732) is vertically arranged; the unloading slide rail (732) is slidably connected to a second push plate (737); the second push plate (737) is connected to a second bushing (733); the shaft of the second bushing (733) is slidably connected to a unloading rod (734); the second push plate (737) is connected to a third cylinder (735) at a side away from the unloading rod (734); the cylinder shaft of the third cylinder (735) passes through the second push plate (737) and is drivingly connected to the unloading rod (734); a fourth cylinder (736) is provided at the lower side of the second push plate (737); the cylinder shaft of the fourth cylinder (736) is vertically arranged; the fourth cylinder (736) and the second push plate (737) are drivingly connected.

10. The automobile exhaust system expansion and locking mold according to claim 1, characterized in that: A pressing cylinder (115) is provided on the upper side of the upper mold plate (11), the pressing cylinder (115) and the upper mold plate (11) are drivingly connected, and the pressing cylinder (115) presses the upper mold plate (11) against the top surface of the lower mold plate (12).

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