Clamp swing arm with safety assembly

Abstract

The utility model provides a kind of with safety component's mold swing arm, including swing arm body and connecting block, one end of the swing arm body is matched with cam on longitudinal shaft through roller, the other end of the swing arm body is detachably connected with connecting block by safety pin, the swing arm body and connecting block are equipped with the through-hole for safety pin to pass, the connecting block is connected with mould in mold seat by mold bar.The utility model realizes the detachable connection of swing arm body and connecting block by safety pin, when overload occurs, safety pin can be preferentially broken, so that connecting block and swing arm body are separated, the transmission path of overload load to longitudinal shaft transmission component is cut off, so as to protect longitudinal shaft on umbrella tooth, bearing and other precision components and swing arm body, significantly reduce equipment maintenance cost and downtime loss.

Description

Technical Field

[0001] This utility model relates to the field of cold heading machine technology, and in particular to a mold closing swing arm with a safety component. Background Technology

[0002] A cold heading machine is a forging and forming device that thickens the top of bars or wires at room temperature. It is a specialized machine mainly used for the mass production of fasteners such as nuts and bolts. The cold heading machine uses a cold heading method to upset the heads of bolts and screws, minimizing cutting work and directly forming them into the required shape and size. This not only saves a significant amount of material but also greatly improves production efficiency and significantly enhances the mechanical strength of the upset parts.

[0003] The opening and closing mechanism of the cold heading machine drives the closing lever to swing back and forth via a cam on the longitudinal shaft, thereby driving the mold to open and close to clamp or release the workpiece. After the workpiece is forged in the mold, the ejector mechanism automatically ejects the workpiece from the mold. Because traditional closing levers (such as the closing swing arm or clamping swing arm disclosed in Chinese patents with publication numbers CN207358050U and CN207358040U) do not have safety components, when the ejector mechanism fails to eject the workpiece from the mold due to mechanical failure, two workpieces will appear in the mold during the next loading. At this time, the clamping load of the mold on the workpiece will increase abnormally, causing overload. The overload load will be transmitted to the longitudinal shaft through the mold, closing lever, and cam, which will cause the transmission components (such as bevel gears and bearings) on the longitudinal shaft to burst and be damaged, or directly crush the closing lever, resulting in high equipment maintenance costs. Utility Model Content

[0004] This utility model proposes a mold closing lever with a safety component, which solves the problem in the prior art where the traditional mold closing lever does not have a safety component, and when the ejection mechanism fails to eject the workpiece from the mold due to mechanical failure, it will cause overload, which will eventually lead to damage to the transmission components on the longitudinal axis or the mold closing lever.

[0005] The technical solution of this utility model is implemented as follows:

[0006] This utility model provides a mold closing swing arm with a safety component, including a swing arm body and a connecting block. One end of the swing arm body is engaged with a cam on a longitudinal shaft via a roller, and the other end of the swing arm body is detachably connected to the connecting block via a safety pin. The swing arm body and the connecting block are provided with through holes for the safety pin to pass through. The connecting block is connected to the mold in the mold closing base via a mold closing rod.

[0007] Preferably, the safety pin includes a bolt and a nut, and the connecting block is detachably connected to the swing arm body by the bolt and nut.

[0008] Preferably, there are two nuts, which are tightened sequentially onto the end of the bolt.

[0009] Preferably, the outer wall of the safety pin has a breakable groove in the middle, and the contact surface between the swing arm body and the connecting block corresponds to the position of the breakable groove.

[0010] Preferably, the side of the swing arm body is provided with a first positioning hole, the side of the connecting block is provided with a second positioning hole, and the outer wall of the safety pin is provided with a first positioning groove and a second positioning groove that respectively match the first positioning hole and the second positioning hole. A first fastening member and a second fastening member are respectively installed in the first positioning hole and the second positioning hole, and the ends of the first fastening member and the second fastening member are respectively embedded in the first positioning groove and the second positioning groove.

[0011] Preferably, the first and second locking members are both screws, and the first and second positioning holes are both threaded holes that mate with the screws.

[0012] Preferably, the bottom of the connecting block is hinged to the swing arm body via a pin.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] (1) This utility model achieves a detachable connection between the swing arm body and the connecting block through a safety pin. When an overload occurs, the safety pin can break first, causing the connecting block to separate from the swing arm body, cutting off the transmission path of the overload load to the longitudinal shaft transmission component, thereby protecting the precision components such as bevel gears and bearings on the longitudinal shaft and the swing arm body, significantly reducing equipment maintenance costs and downtime losses.

[0015] (2) This utility model opens an easy-break groove in the middle of the outer wall of the safety pin and aligns it with the contact surface of the swing arm body and the connecting block, so that the overload stress is concentrated at the easy-break groove, thereby achieving precise breakage of the safety pin and improving the response accuracy of overload protection.

[0016] (3) By cooperating with the positioning groove on the safety pin and the fastening parts on the side of the swing arm body and the connecting block, the safety pin, which is broken into two pieces, can be fixed in the through holes of the swing arm body and the connecting block after the safety pin breaks, thus avoiding damage to other parts of the equipment caused by the high-speed splashing after the safety pin breaks.

[0017] (4) The bottom of the connecting block is connected to the swing arm body by a pin. After the safety pin breaks and fails, the connecting block can be flipped down around the pin to prevent the connecting block from falling to the ground or inside the equipment. It also makes it easy to replace the safety pin. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a mold closing swing arm with a safety component according to the present invention;

[0020] Figure 2 This is a schematic diagram of the bolt structure in an embodiment of this utility model;

[0021] Figure 3 This is a schematic diagram of the assembly structure of the connecting block and the swing arm body in an embodiment of this utility model;

[0022] In the diagram: 1. Swing arm body; 2. Connecting block; 3. Roller; 4. Longitudinal shaft; 5. Cam; 6. Through hole; 7. Mold clamping rod; 8. Mold clamping base; 9. Mold; 10. Bolt; 11. Nut; 12. Easily broken groove; 13. First positioning hole; 14. Second positioning hole; 15. First positioning groove; 16. Second positioning groove; 17. Pin. Detailed Implementation

[0023] The technical solution of this utility model will be clearly and completely described below with reference to its embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] Reference Figures 1 to 3 This utility model provides a mold closing swing arm with a safety component, including a swing arm body 1 and a connecting block 2. One end of the swing arm body 1 is engaged with a cam 5 on a longitudinal shaft 4 via a roller 3, and the other end of the swing arm body 1 is detachably connected to the connecting block 2 via a safety pin. The swing arm body 1 and the connecting block 2 are provided with through holes 6 for the safety pin to pass through. The connecting block 2 is connected to the mold 9 in the mold closing base 8 via a mold closing rod 7.

[0025] This utility model achieves a detachable connection between the swing arm body 1 and the connecting block 2 through a safety pin. In the event of an overload, the safety pin can break first, separating the connecting block 2 from the swing arm body 1 and cutting off the transmission path of the overload load to the transmission components of the longitudinal shaft 4. This protects the precision components such as bevel gears and bearings on the longitudinal shaft 4 as well as the swing arm body 1, significantly reducing equipment maintenance costs and downtime losses.

[0026] Preferably, such as Figures 1 to 3 As shown, the safety pin includes a bolt 10 and a nut 11. The connecting block 2 and the swing arm body 1 are detachably connected by the bolt 10 and the nut 11. Using the bolt 10 and the nut 11 as the core components of the safety pin results in a simple structure that is easy to assemble and replace, and is inexpensive. In specific implementation, other connecting parts can also be used as the safety pin.

[0027] Preferably, such as Figure 3 As shown, there are two nuts 11. The two nuts 11 are tightened sequentially at the end of the bolt 10, which can effectively prevent the nuts 11 from loosening due to equipment vibration, ensure the connection reliability of the safety component under normal working conditions, and avoid accidental failure.

[0028] Preferably, such as Figure 2 As shown, a breakable groove 12 is provided in the middle of the outer wall of the safety pin, and the contact surface of the swing arm body 1 and the connecting block 2 corresponds to the position of the breakable groove 12. By providing a breakable groove 12 in the middle of the outer wall of the safety pin and aligning it with the contact surface of the swing arm body 1 and the connecting block 2, the overload stress is concentrated at the breakable groove 12, thereby achieving precise breakage of the safety pin and improving the response accuracy of overload protection.

[0029] In specific implementation, the easily breakable groove 12 can be a groove that is not limited to symmetrical (such as an annular groove) or asymmetrical (such as a D-shaped groove).

[0030] Preferably, such as Figure 2 , 3 As shown, the side of the swing arm body 1 has a first positioning hole 13, and the side of the connecting block 2 has a second positioning hole 14. The outer wall of the safety pin has a first positioning groove 15 and a second positioning groove 16 that respectively mate with the first positioning hole 13 and the second positioning hole 14. A first fastening member and a second fastening member (not shown in the figure) are respectively installed in the first positioning hole 13 and the second positioning hole 14. The ends of the first fastening member and the second fastening member are respectively embedded in the first positioning groove 15 and the second positioning groove 16. Through the cooperation between the positioning groove on the safety pin and the fastening members on the side of the swing arm body 1 and the connecting block 2, the two pieces of the safety pin can be fixed in the through holes 6 of the swing arm body 1 and the connecting block 2 after the safety pin breaks, thus preventing the high-speed splashing of the broken safety pin from damaging other parts of the equipment.

[0031] Preferably, both the first and second locking members are screws, and both the first positioning hole 13 and the second positioning hole 14 are threaded holes that mate with the screws. In practice, other types of locking members may also be used.

[0032] In practice, the positioning groove can be a recess in the form of annular groove, arc groove or blind hole.

[0033] Preferably, such as Figure 3 As shown, the bottom of the connecting block 2 is hinged to the swing arm body 1 by a pin 17. After the safety pin breaks and fails, the connecting block 2 can be flipped down around the pin 17 to prevent the connecting block 2 from falling to the ground or into the equipment. It also makes it easy to replace the new safety pin.

[0034] The working process of the mold closing swing arm of this utility model is as follows:

[0035] Under normal operating conditions:

[0036] The cam 5 on the longitudinal axis 4 drives the roller 3 at one end of the swing arm body 1 to swing around the fulcrum by rotating it; the connecting block 2 at the other end of the swing arm body 1 is rigidly connected to the swing arm body 1 by a safety pin, which drives the mold clamping rod 7 to move, and drives the mold 9 in the mold clamping base 8 to open and close, completing the workpiece clamping or releasing action. After the workpiece is upset forged, the ejection mechanism pushes the workpiece out of the mold 9, ready for the next loading.

[0037] Under abnormal operating conditions:

[0038] If the ejection mechanism fails, causing the workpiece to remain in mold 9, two workpieces will remain in mold 9 during the next mold closing, resulting in an abnormally increased clamping load and overload. The overload load is transmitted to connecting block 2 through mold 9 and mold closing rod 7, and further acts on the safety pin. Because the safety pin has a breakable groove 12 in the middle of its outer wall, and its position is aligned with the contact surface of the swing arm body 1 and connecting block 2, stress is concentrated at the breakable groove 12.

[0039] When the load exceeds the design threshold, the safety pin breaks precisely at the breakable groove 12, separating the connecting block 2 from the swing arm body 1 and cutting off the overload transmission path to the transmission components (bevel gears, bearings) of the longitudinal shaft 4.

[0040] The two broken pieces of the safety pin are respectively stuck in the through holes 6 of the swing arm body 1 and the connecting block 2. The positioning groove on the safety pin is engaged with the fastening part on the side to prevent the broken pin from flying and damaging the equipment.

[0041] The bottom of the connecting block 2 is hinged to the swing arm body 1 via a pin 17. After breakage, the connecting block 2 will flip downward around the pin 17 to prevent it from falling into the equipment or onto the ground.

[0042] After stopping the machine to repair the material return mechanism, loosen the fasteners on the connecting block 2 and the swing arm body 1, remove the broken pin stuck in the connecting block 2 and the swing arm body 1, replace it with a new safety pin, and re-rigidly connect the connecting block 2 and the swing arm body 1. After the equipment is restarted, the mold closing swing arm resumes normal transmission function.

[0043] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A mold closing swing arm with a safety component, characterized in that, It includes a swing arm body (1) and a connecting block (2). One end of the swing arm body (1) is engaged with a cam (5) on a longitudinal shaft (4) via a roller (3). The other end of the swing arm body (1) is detachably connected to the connecting block (2) via a safety pin. The swing arm body (1) and the connecting block (2) are provided with through holes (6) for the safety pin to pass through. The connecting block (2) is connected to the mold (9) in the mold base (8) via a mold clamping rod (7).

2. A mold closing swing arm with a safety component as described in claim 1, characterized in that, The safety pin includes a bolt (10) and a nut (11), and the connecting block (2) is detachably connected to the swing arm body (1) by the bolt (10) and the nut (11).

3. A mold closing swing arm with a safety component as described in claim 2, characterized in that, There are two nuts (11), and the two nuts (11) are tightened in sequence at the end of the bolt (10).

4. A mold closing swing arm with a safety component as described in claim 1, characterized in that, The safety pin has a breakable groove (12) in the middle of its outer wall, and the contact surface between the swing arm body (1) and the connecting block (2) corresponds to the position of the breakable groove (12).

5. A mold closing swing arm with a safety component as described in claim 1, characterized in that, The side of the swing arm body (1) is provided with a first positioning hole (13), the side of the connecting block (2) is provided with a second positioning hole (14), and the outer wall of the safety pin is provided with a first positioning groove (15) and a second positioning groove (16) that are respectively matched with the first positioning hole (13) and the second positioning hole (14). A first fastening member and a second fastening member are respectively installed in the first positioning hole (13) and the second positioning hole (14), and the ends of the first fastening member and the second fastening member are respectively embedded in the first positioning groove (15) and the second positioning groove (16).

6. A mold closing swing arm with a safety component as described in claim 5, characterized in that, Both the first and second fastening components are screws, and both the first positioning hole (13) and the second positioning hole (14) are screw holes that mate with the screws.

7. A mold closing swing arm with a safety component as described in claim 1, characterized in that, The bottom of the connecting block (2) is hinged to the swing arm body (1) via a pin (17).

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