Drag chain forging equipment

Through the combination of heating box, air pump and heating ring, combined with the design of the annular frame and air outlet nozzle, the problem of uneven temperature during the forging of the drag chain is solved, stable control and precise adjustment of the drag chain temperature is achieved, and forging quality and equipment versatility are improved.

CN120362390AActive Publication Date: 2025-07-25AOFENG TOWLINE TECH (JIANGSU) CO LTD
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Patent Information

Application Number
CN202510812811.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-18
Publication Date
2025-07-25
Estimated Expiration
2045-06-18

AI Technical Summary

Technical Problem

During the forging process of existing forging equipment, the temperature of the drag chain is easily changed due to environmental factors or forging operations, resulting in local uneven heat dissipation or excessively rapid heat dissipation, affecting material performance and forging accuracy.

Method used

The combination of heating box, air pump, heating ring and air outlet nozzle is adopted to transport heat flow through the annular frame and blow on the surface of the drag chain. Combined with the driving motor, the rotation of the annular frame and the air outlet nozzle on the long plate is driven to achieve uniform distribution of heat flow, and the drag chain position is maintained through the stabilization mechanism and the thermal conductor rod.

Benefits of technology

The stable control of the drag chain temperature is achieved, the material performance changes caused by temperature fluctuations are avoided, the forging quality and accuracy are improved, the equipment is versatile and operational convenience are enhanced, and the equipment service life is extended.

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Abstract

The invention belongs to the technical field of hardware forging and discloses drag chain forging equipment which comprises a base, an auxiliary mechanism with a machining table is mounted at the top end of the base, the machining table is fixedly mounted at the top end of the base, a turbulent flow mechanism with an annular frame is arranged at the top end, close to the machining table, of the base, and the annular frame is rotationally mounted at the top end of the machining table. The surface, close to the machining table, of the annular frame is provided with a long plate in a communicating mode, and the surface, close to the machining table, of the long plate is provided with a plurality of air outlet nozzles used for blowing and turbulent flow to the drag chain in a communicating mode. A stable and appropriate temperature environment is provided for the drag chain, the temperature of the drag chain in the forging process can be more accurately maintained, and material performance changes caused by temperature fluctuation are avoided, so that the forging quality and precision of the drag chain are effectively guaranteed, and the mechanical performance and stability of the finished drag chain are improved.
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Description

Technical Field

[0001] The invention relates to the technical field of hardware forging, and in particular to a drag chain forging device. Background Art

[0002] In the field of mechanical manufacturing and processing, drag chains, as an important component, are widely used in various types of mechanical equipment to protect cables, air pipes and other pipelines to ensure the stability and safety of equipment operation. In the forging process of drag chains, temperature control is one of the key factors. The drag chain needs to maintain a suitable temperature during forging to ensure the plasticity and ductility of the material, thereby ensuring that the forged drag chain has ideal mechanical properties.

[0003] During the forging process of existing forging equipment, the temperature of the drag chain is easily changed due to environmental factors or forging operations, and it is difficult to maintain a stable temperature range. During the forging process, the drag chain is unevenly heated locally, or the temperature drops due to excessive heat dissipation, which will affect the performance of the drag chain material and reduce the forging accuracy. The forged drag chain may have uneven internal stress distribution, affecting the service life of the drag chain. Summary of the invention

[0004] The object of the present invention is to provide a drag chain forging device to solve the problem mentioned in the background art that the drag chain is unevenly heated locally during the forging process, or the temperature drops due to excessive heat dissipation, which affects the performance of the drag chain material.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a drag chain forging device, comprising a base, an auxiliary mechanism with a processing table is installed on the top of the base, the processing table is fixedly installed on the top of the base, a spoiler mechanism with an annular frame is arranged near the top of the processing table of the base, the annular frame is rotatably installed on the top of the processing table, a long plate is installed on the surface of the annular frame close to the processing table, a plurality of air outlet nozzles for blowing spoiler to the drag chain are installed on the surface of the long plate close to the processing table, a heating assembly with a heating ring is arranged on the top of the annular frame, the heating ring for keeping the drag chain warm is fixedly installed on the top of the annular frame, an air pump is fixedly installed on the top of the base, a heat outlet pipe is installed between the output end of the air pump and the heating ring, and a heating box for conveying heat flow is installed on the output end of the air pump.

[0006] As a preferred technical solution of the present invention, a driving motor is fixedly mounted on the top of the base, a first gear is fixedly mounted on the output shaft of the driving motor, a tooth groove is formed on the outer surface of the annular frame, and the first gear is meshed with the tooth groove.

[0007] As a preferred technical solution of the present invention, a sticky plate for adhering gas impurities is installed in the internal cavity of the long plate, and a plurality of filter meshes for filtering gas are arranged between the long plate and the air outlet nozzle.

[0008] As a preferred technical solution of the present invention, a plurality of tapered holes for pressurized air outlet are formed on the surface of the long plate close to the inside of the annular frame.

[0009] As a preferred technical solution of the present invention, a stabilizing mechanism with support rods is arranged at the top of the base. A plurality of cylinders are fixedly installed at the top of the base, and the plurality of cylinders are communicated and installed through connecting pipes. A sliding rod for limiting and stabilizing the drag chain is slidably installed inside the cylinder.

[0010] As a preferred technical solution of the present invention, one end of the connecting pipe is communicated and installed with the heat outlet pipe. The inner walls of the cylinder and the sliding rod are respectively provided with a first circular groove and a second circular groove. A first heat conducting rod and a second heat conducting rod are respectively installed inside the first circular groove and the second circular groove. A plurality of heat conducting grooves are formed on the outer surface of the cylinder.

[0011] As a preferred technical solution of the present invention, a damping spring is installed between the inner wall of the cylinder and one end of the sliding rod, and a protective pad is installed at one end of the sliding rod close to the drag chain.

[0012] As a preferred technical solution of the present invention, a plurality of pressing plates are fixedly installed inside the processing table, and a plurality of rigid buffer members are arranged between the two pressing plates. A placing table is fixedly installed at the top of the pressing plate.

[0013] As a preferred technical solution of the present invention, a cleaning mechanism with an electrostatic adsorption plate is arranged on the outer surface of the processing table. A plurality of mounting plates are fixedly installed on the outer surface of the processing table. The electrostatic adsorption plate is fixedly installed on the surface of the mounting plate close to the processing table, and a rubber plate is installed on the side wall of the electrostatic adsorption plate. A collection groove is formed on the surface of the mounting plate close to the rubber plate.

[0014] As a preferred technical solution of the present invention, a support frame is fixedly installed at the top of the base. A forging hammer for forging the drag chain is arranged at the middle position of the support frame, and the forging hammer is located at the top of the processing table.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. Through the coordinated operation of the heating box, air pump, heat outlet pipe, and heating ring, the present invention can deliver heat flow to the annular frame and blow the drag chain on the processing table through the air outlet nozzles on the long board, providing a stable and appropriate temperature environment for the drag chain. Compared with traditional equipment, this temperature control method can more accurately maintain the temperature of the drag chain during forging, avoid changes in material properties caused by temperature fluctuations, and thus effectively ensure the quality and accuracy of drag chain forging, improving the mechanical properties and stability of the finished drag chain.

[0016] 2. The present invention drives the annular frame to rotate at the top of the processing table by meshing the first gear with the tooth grooves on the outer surface of the annular frame. During the rotation, the heat flow ejected from the air outlet nozzles will stir at the top of the drag chain, enabling the heat flow to be more evenly distributed around the drag chain. This uniform heat flow distribution can ensure that all parts of the drag chain are heated uniformly, avoiding problems such as forging deformation or uneven stress caused by local temperature differences, further improving the forging accuracy of the drag chain, and ensuring the dimensional accuracy and shape consistency of the forged drag chain.

[0017] 3. The present invention can adhere to impurities in the gas through the sticky plate installed in the inner cavity of the long board, effectively filtering the heat flow delivered to the surface of the drag chain. This design not only ensures the purity of the heat flow during the forging process of the drag chain, avoids damage to the surface of the drag chain or affects the forging quality caused by impurities, but also can reduce the risk of equipment failure caused by impurity accumulation in the forging area to a certain extent, and extend the service life of the equipment.

[0018] 4. Through the telescopic part formed by the cylinder and the sliding rod in the stabilizing mechanism, cooperating with the damping spring, the present invention can provide viscous buffering during the limiting process, reduce the impact force on the drag chain during forging, avoid damage to the drag chain due to excessive extrusion. At the same time, this limiting method can be adaptively adjusted according to the actual size of different specifications of drag chains, without frequently replacing or adjusting the limiting components, greatly improving the versatility and operation convenience of the equipment, and reducing the production cost and operation difficulty.

[0019] 5. By connecting the connecting pipe with the heat outlet pipe, the present invention enables the heat flow to enter the inside of the cylinder, and then uses the first heat conducting rod and the second heat conducting rod installed on the inner walls of the cylinder and the sliding rod to achieve heat conduction. The thermal expansion effect enables the telescopic part to better clamp the drag chain during limiting, improving the clamping effect. Moreover, the support rod maintains a certain temperature during the limiting process, avoiding the cooling interference at the limiting position of the drag chain due to too low temperature, further optimizing the limiting conditions, ensuring the stable position of the drag chain during forging, and thus improving the forging accuracy and the quality of the finished product. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is the structural schematic diagram of the heating ring of the present invention; Figure 3 Schematic diagram of the air outlet nozzle structure of the present invention; Figure 4 Schematic diagram of the internal structure of the long board of the present invention; Figure 5 Schematic diagram of the structure of the stabilizing mechanism of the present invention; Figure 6 Schematic diagram of the cylindrical structure of the present invention; Figure 7 Schematic diagram of the internal structure of the cylinder of the present invention; Figure 8 Schematic diagram of the electrostatic adsorption plate structure of the present invention; Figure 9 Schematic diagram of the internal structure of the processing table of the present invention.

[0021] In the figure: 1, base; 2, auxiliary mechanism; 21, processing table; 22, placement table; 23, pressing plate; 24, rigid buffer; 3, support frame; 4, forging hammer; 5, flow disturbing mechanism; 51, drive motor; 52, first gear; 53, tooth groove; 54, annular frame; 55, long board; 56, air outlet nozzle; 57, sticky board; 58, tapered hole; 59, heating component; 591, heating ring; 592, heat outlet pipe; 593, air pump; 594, heating box; 510, filter screen; 6, stabilizing mechanism; 61, connecting pipe; 62, support rod; 63, sliding rod; 64, cylinder; 65, first circular groove; 66, protective pad; 67, damping spring; 68, first heat conducting rod; 69, second heat conducting rod; 7, cleaning mechanism; 71, mounting plate; 72, electrostatic adsorption plate; 73, rubber plate. Specific embodiments

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] Please refer to Figures 1-9 , the present invention provides a drag chain forging device, including a base 1, an auxiliary mechanism 2 with a processing table 21 is installed at the top of the base 1, the processing table 21 is fixedly installed at the top of the base 1, a flow disturbing mechanism 5 with an annular frame 54 is arranged at the top of the base 1 close to the processing table 21, the annular frame 54 is rotatably installed at the top of the processing table 21, a long board 55 is connected and installed on the surface of the annular frame 54 close to the processing table 21, and a plurality of air outlet nozzles 56 for blowing and disturbing the drag chain are connected and installed on the surface of the long board 55 close to the processing table 21.

[0024] Among them, the drag chain forging equipment uses the base 1 as the basic support structure. An auxiliary mechanism 2 with a processing table 21 is fixedly installed at the top of the base 1. The processing table 21 provides an operating platform for drag chain forging. When forging the drag chain, after the gas is input from the annular frame 54 and enters the interior of the long plate 55, the gas blows out from multiple air outlet nozzles 56 towards the drag chain on the processing table 21, forming an air current, so that the air current ejected from the air outlet nozzles 56 forms a dynamic turbulent flow effect around the drag chain. The dynamic turbulent air flow can improve the air circulation condition around the processing table 21, take away the waste gas and peculiar smell generated during the forging process. At the same time, good air circulation also helps to prevent the temperature from being too high or the gas concentration from being too large in a local area, improving the safety and stability of the equipment operation.

[0025] In the technical solution of the embodiment of the present application, a heating component 59 with a heating ring 591 is arranged at the top of the annular frame 54. The heating ring 591 for heat preservation of the drag chain is fixedly installed at the top of the annular frame 54. An air pump 593 is fixedly installed at the top of the base 1. An out heat pipe 592 is connected and installed between the output end of the air pump 593 and the heating ring 591, and a heating box 594 for conveying heat flow is connected and installed at the output end of the air pump 593.

[0026] Among them, the heating box 594 generates heat flow. The air pump 593 conveys the heat flow. Part of it enters the relevant structure of the heating component 59 through the out heat pipe 592, and the other part enters the annular frame 54 and finally blows out from the air outlet nozzles 56 to blow the drag chain for turbulent flow. The heating ring 591 can keep the drag chain warm. By blowing the drag chain with the heat flow, the drag chain can be heated and kept warm, maintaining the appropriate temperature of the drag chain during the forging process, avoiding the change of material properties caused by the temperature drop and affecting the forging quality, which helps to improve the precision and finished product quality of the drag chain forging.

[0027] In some embodiments, a driving motor 51 is fixedly installed at the top of the base 1. A first gear 52 is fixedly installed on the output shaft of the driving motor 51. A tooth groove 53 is formed on the outer surface of the annular frame 54, and the first gear 52 meshes with the tooth groove 53.

[0028] Among them, when the driving motor 51 works, the output shaft drives the first gear 52 to rotate. Since the first gear 52 meshes with the tooth groove 53, the annular frame 54 is driven to rotate at the top of the processing table 21. The rotation of the annular frame 54 can stir the heat flow ejected from the air outlet nozzles 56 at the top of the drag chain, making the heat flow more evenly distributed around the drag chain, ensuring that each part of the drag chain is heated uniformly, avoiding forging problems caused by local temperature differences, and further improving the precision and effect of the drag chain forging.

[0029] In some embodiments, a sticky plate 57 for adhering gas impurities is installed in the internal cavity of the long plate 55, and a plurality of filter meshes 510 for filtering gas are arranged between the long plate 55 and the air outlet nozzles 56.

[0030] Among them, when the heat flow enters the annular frame 54 from the heat outlet pipe 592 and then sprays out from the air outlet nozzle 56 through the long plate 55, the heat flow will pass through the sticky plate 57 and the filter screen 510 in sequence. The sticky plate 57 and the filter screen 510 can effectively filter impurities in the heat flow, prevent the impurities from being blown onto the surface of the drag chain by the heat flow, avoid damage to the surface of the drag chain or affect the forging quality caused by the impurities, and at the same time reduce the risk of equipment failure caused by the accumulation of impurities in the forging area and extend the service life of the equipment.

[0031] In some embodiments, a plurality of tapered holes 58 for pressurized air outlet are formed on the surface of the long plate 55 close to the inside of the annular frame 54.

[0032] Among them, when the heat flow enters the long plate 55, due to the special shape of the tapered holes 58, it will play a pressurizing role on the heat flow, so that the heat flow has higher pressure and speed when spraying out from the air outlet nozzle 56. The pressurized heat flow can more effectively blow the surface of the drag chain, enhance the turbulent flow effect of the heat flow on the drag chain, improve the heat transfer efficiency, make the temperature of the drag chain reach and maintain in the appropriate range faster, and contribute to improving the forging efficiency and quality.

[0033] In some embodiments, a stabilizing mechanism 6 with a support rod 62 is provided at the top of the base 1. A plurality of cylinders 64 are fixedly installed at the top of the base 1, and the plurality of cylinders 64 are connected and installed through a connecting pipe 61. A sliding rod 63 for limiting and stabilizing the drag chain is slidably installed inside the cylinder 64.

[0034] Among them, by inflating and pressurizing the inside of the cylinder 64, the sliding rod 63 slides inside the cylinder 64, and the limit of drag chains of different sizes can be realized. This telescopic limit structure can flexibly adapt to drag chains of different specifications, without frequently replacing or adjusting the limit components, improving the versatility and operation convenience of the equipment, and reducing the production cost and operation difficulty.

[0035] In some embodiments, one end of the connecting pipe 61 is connected and installed with the heat outlet pipe 592. First circular grooves 65 and second circular grooves are respectively formed on the inner walls of the cylinder 64 and the sliding rod 63. A first heat conducting rod 68 and a second heat conducting rod 69 are respectively installed inside the first circular groove 65 and the second circular groove. A plurality of heat conducting grooves are formed on the outer surface of the cylinder 64.

[0036] Among them, after the heat flow enters the cylinder 64, the heat is transferred through the heat conducting rods and the heat conducting grooves, so that the cylinder 64 and the sliding rod 63 expand due to heat, thereby enhancing the clamping effect on the drag chain, ensuring the stable position of the drag chain during the forging process, improving the forging accuracy. At the same time, the support rod 62 maintains a certain temperature to avoid the cooling interference at the drag chain limit due to too low temperature.

[0037] In some embodiments, a damping spring 67 is installed between the inner wall of the cylinder 64 and one end of the sliding rod 63, and a protective pad 66 is installed at the end of the sliding rod 63 close to the drag chain.

[0038] Among them, when the drag chain is impacted by the forging hammer 4, the sliding rod 63 will be squeezed. The viscous buffer provided by the damping spring 67 can reduce the impact force on the drag chain during forging, avoid damage to the drag chain due to excessive extrusion, and the protective pad 66 can prevent the sliding rod 63 from directly contacting the drag chain and causing scratches, protect the surface quality of the drag chain, and improve the qualified rate of finished products.

[0039] In some embodiments, a plurality of pressing plates 23 are fixedly installed inside the processing table 21, and a plurality of rigid buffer members 24 are arranged between the two pressing plates 23. A placing table 22 is fixedly installed at the top end of the pressing plate 23.

[0040] Among them, when the drag chain is placed on the placing table 22 for forging, the impact force of the forging hammer 4 will be transmitted to the pressing plate 23 through the placing table 22, and the rigid buffer member 24 will undergo elastic deformation to absorb part of the impact force, reduce the vibration and deformation of the processing table 21, improve the stability and service life of the processing table 21, and at the same time ensure the position accuracy of the drag chain during forging, which is beneficial to improving the forging quality.

[0041] In some embodiments, a cleaning mechanism 7 with an electrostatic adsorption plate 72 is arranged on the outer surface of the processing table 21. A plurality of mounting plates 71 are fixedly installed on the outer surface of the processing table 21. The electrostatic adsorption plate 72 is fixedly installed on the surface of the mounting plate 71 close to the processing table 21, and a rubber plate 73 is installed on the side wall of the electrostatic adsorption plate 72. A collection groove is formed on the surface of the mounting plate 71 close to the rubber plate 73.

[0042] Among them, during the forging process, the electrostatic adsorption plate 72 is energized through an external electrostatic generator, so that the electrostatic adsorption plate 72 is charged. The debris and dust generated during forging will be adsorbed by the electrostatic adsorption plate 72. The rubber plate 73 can prevent the debris from directly hitting the electrostatic adsorption plate 72 and causing damage. The debris adsorbed on the rubber plate 73 will fall into the collection groove, thereby keeping the environment around the processing table 21 clean, reducing the influence of debris and dust on the forging process, improving the forging accuracy and product quality, and at the same time facilitating the cleaning of the collected debris.

[0043] In some embodiments, a support frame 3 is fixedly installed at the top end of the base 1. A forging hammer 4 for forging the drag chain is arranged at the middle position of the support frame 3, and the forging hammer 4 is located at the top end of the processing table 21.

[0044] Among them, the forging hammer 4 is usually driven by a hydraulic system. Under the action of power, the forging hammer 4 can reciprocate in the vertical direction. When forging the drag chain, the power system is started to drive the forging hammer 4 to move downward, acting on the drag chain placed on the processing table 21 with a certain impact force or pressure, so as to realize the repeated forging of the drag chain, ensure that each strike of the forging hammer 4 can accurately act on the part of the drag chain that needs to be forged, avoid forging mistakes caused by position deviation, and improve the forging accuracy and finished product quality.

[0045] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions or modifications made based on the present invention to solve basically the same technical problems and achieve basically the same technical effects are all covered by the protection scope of the present invention.

Claims

1. A drag chain forging device, comprising a base (1), characterized in that: An auxiliary mechanism (2) having a processing table (21) is installed at the top of the base (1); the processing table (21) is fixedly installed at the top of the base (1); a spoiler mechanism (5) having an annular frame (54) is provided at the top of the base (1) near the processing table (21); the annular frame (54) is rotatably installed at the top of the processing table (21); a long plate (55) is installed on the surface of the annular frame (54) near the processing table (21); and a plurality of air outlet nozzles (56) for blowing spoiler air to the drag chain are installed on the surface of the long plate (55) near the processing table (21); A heating assembly (59) with a heating ring (591) is arranged at the top of the annular frame (54); the heating ring (591) for keeping the drag chain warm is fixedly mounted on the top of the annular frame (54); an air pump (593) is fixedly mounted on the top of the base (1); a heat outlet pipe (592) is installed in communication between the output end of the air pump (593) and the heating ring (591); and a heating box (594) for conveying heat flow is installed in communication with the output end of the air pump (593).

2. The drag chain forging equipment according to claim 1, characterized in that: A driving motor (51) is fixedly mounted on the top of the base (1), a first gear (52) is fixedly mounted on the output shaft of the driving motor (51), a tooth groove (53) is formed on the outer surface of the annular frame (54), and the first gear (52) meshes with the tooth groove (53).

3. The drag chain forging equipment according to claim 1, characterized in that: The inner cavity of the long plate (55) is provided with a sticky plate (57) for adhering gas impurities, and a plurality of filter screens (510) for filtering gas are arranged between the long plate (55) and the gas outlet nozzle (56).

4. A drag chain forging device according to claim 1, characterized in that: A plurality of tapered holes (58) for pressurized gas discharge are formed on the surface of the long plate (55) close to the inside of the annular frame (54).

5. A drag chain forging device according to claim 1, characterized in that: A stabilizing mechanism (6) with a support rod (62) is provided at the top of the base (1), and a plurality of cylinders (64) are fixedly installed at the top of the base (1). The plurality of cylinders (64) are connected and installed via a connecting pipe (61), and a sliding rod (63) for limiting and stabilizing the drag chain is slidably installed inside the cylinder (64).

6. The drag chain forging equipment according to claim 5, characterized in that: One end of the connecting pipe (61) is connected to the heat outlet pipe (592) and installed; the inner walls of the cylinder (64) and the sliding rod (63) are respectively provided with a first circular groove (65) and a second circular groove; the first circular groove (65) and the second circular groove are respectively provided with a first heat conducting rod (68) and a second heat conducting rod (69); and the outer surface of the cylinder (64) is provided with a plurality of heat conducting grooves.

7. A drag chain forging device according to claim 5, characterized in that: A damping spring (67) is installed between the inner wall of the cylinder (64) and one end of the slide bar (63), and a protective pad (66) is installed at one end of the slide bar (63) close to the drag chain.

8. A drag chain forging device according to claim 1, characterized in that: A plurality of pressing plates (23) are fixedly mounted inside the processing table (21), and a plurality of rigid buffer members (24) are arranged between two pressing plates (23). A storage table (22) is fixedly mounted on the top of the pressing plate (23).

9. The drag chain forging equipment according to claim 1, characterized in that: The outer surface of the processing table (21) is provided with a cleaning mechanism (7) with an electrostatic adsorption plate (72). A plurality of mounting plates (71) are fixedly installed on the outer surface of the processing table (21). The electrostatic adsorption plate (72) is fixedly installed on the surface of the mounting plate (71) close to the processing table (21), and a rubber plate (73) is installed on the side wall of the electrostatic adsorption plate (72). A collection groove is formed on the surface of the mounting plate (71) close to the rubber plate (73).

10. A drag chain forging device according to claim 1, characterized in that: A support frame (3) is fixedly installed at the top end of the base (1). A forging hammer (4) for forging a drag chain is arranged at the middle position of the support frame (3), and the forging hammer (4) is located at the top end of the processing table (21).

Citation Information

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