Inner guide type oil cylinder shear pin type torque limiter

Abstract

The utility model belongs to the technical field of electronic aluminum foil casting equipment, and relates to an inner guide type oil cylinder shear pin type torque limiter which comprises a shell and a connecting piece, and the top of the shell is connected with jacked equipment; the connecting piece is arranged in the shell, and the lower portion of the connecting piece is fixedly connected to an oil cylinder plunger rod head flange. A cover plate is arranged on the upper portion of the connecting piece, and a shear pin is arranged between the cover plate and the connecting piece. And a transmission piece for transmitting torque is arranged between the cover plate and the shell. When the torque is larger, the shear pin is sheared off, so that the plunger rod of the oil cylinder below is protected from being affected by the torque, and an inner guide key and a key groove of the cylinder body in the oil cylinder are protected from being damaged.

Description

Technical Field

[0001] This utility model belongs to the technical field of electronic aluminum foil casting equipment, and particularly relates to an internally guided hydraulic cylinder shear pin type torque limiter. Background Technology

[0002] The hydraulic cylinder of a casting machine is a key piece of equipment in the electronic aluminum foil casting process, enabling semi-automated continuous casting production. During the casting process, the ingot, crystallizer, or equipment in the casting rolling process may sometimes experience torsional deformation or uneven loading. This causes the piston rod of the hydraulic cylinder responsible for lifting the crystallization platform to be subjected to torsional shear forces. Large torsional shear forces can damage the flat key on the piston rod and the guide keyway inside the cylinder body, leading to the scrapping of the casting equipment and halting production. Traditional shear pin couplings have the following structure and principle: Figure 1 As shown, the drive shaft 13 is connected to the driven shaft 19 via a shear pin 14, pin sleeve 15, pin sleeve 2 16, double-eared retaining washer 17, and locking double nuts 18, which together transmit torque and power and rotate together. This type of coupling is only suitable for various rotary transmission conditions, and is not suitable for conditions with no transmission, less overload torque, or heavy torque overload. Therefore, there is an urgent need for a torque limiter that only transmits vertical support force, disconnects when there is abnormal torque overload, and plays a protective role. Summary of the Invention

[0003] To address the problem of damage to the flat key on the piston rod and the guide keyway inside the cylinder body caused by large torsional shear forces on the existing hydraulic cylinder piston rod, this utility model provides an internal guide type hydraulic cylinder shear pin torque limiter. When a large torque occurs, the shear pin is cut off, thereby protecting the lower hydraulic cylinder piston rod from torque and protecting the internal guide key and cylinder body keyway from damage.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] An internally guided hydraulic cylinder shear pin type torque limiter includes a housing and a connecting member. The top of the housing is connected to the device being lifted. The connecting member is disposed inside the housing, and its lower part is fixedly connected to the flange of the hydraulic cylinder plunger rod head. A cover plate is provided on the upper part of the connecting member, and a shear pin is provided between the cover plate and the connecting member. A transmission member for transmitting torque is provided between the cover plate and the housing. By providing a housing, connecting member, cover plate, and shear pin at the head of the hydraulic cylinder plunger rod, the hydraulic cylinder shears off the shear pin when subjected to a large torque, thereby protecting the lower hydraulic cylinder plunger rod from torque and protecting the internal guide key and cylinder keyway inside the hydraulic cylinder from damage.

[0006] Furthermore, at least one interconnected hole is provided between the cover plate and the connector, and a shearing pin is provided in each hole, the shearing pin being fixedly connected to the upper cover plate.

[0007] Furthermore, the transmission component is a flat key, and a keyway is provided at the connection between the housing and the upper cover plate, with the flat key positioned within the keyway. Torque is transmitted via the flat key, allowing the pushed component to transmit torque to the shear pin through the flat key, housing, and cover plate when subjected to significant torque.

[0008] Furthermore, a cylindrical pin is provided between the connector and the top of the cylinder plunger rod. The cylindrical pin is used for connection and positioning.

[0009] Furthermore, an inner cone is provided at the center of the flange at the head of the hydraulic cylinder plunger rod. A cavity is formed between the inner cone and the connecting piece, and the cavity communicates with the interior of the hydraulic cylinder plunger rod. A central pin with clearance fit is provided inside the cavity. The inner cone ensures pressure balance inside the hydraulic cylinder plunger rod.

[0010] Furthermore, a through hole is formed at the bottom of the inner cone, which connects the inside of the cylinder plunger rod to the cavity; the flange at the head of the cylinder plunger rod is clearance-fitted with the connecting piece, and the connecting piece and the cover plate are clearance-fitted with the housing. This achieves the effect of balancing the air pressure inside and outside the plunger cylinder.

[0011] Furthermore, the diameter of the through hole is less than or equal to 3mm. This prevents debris from entering the plunger cylinder due to excessively large orifices, which could contaminate the cylinder's internal cavity and affect its operation.

[0012] Furthermore, both the cover plate and the connector have threaded holes at their centers for lifting.

[0013] The beneficial effects of this utility model through the above technical solution are:

[0014] This invention features a torque limiter at the top of the cylinder plunger rod. When abnormal torque occurs in the equipment series at the top of the cylinder plunger rod, the shear pin is cut off, protecting the lower cylinder plunger rod from torque and preventing damage to the internal guide key and cylinder keyway of the internal guide cylinder, thus minimizing losses. After cutting off the shear pin, only the shear pin needs to be replaced, facilitating maintenance and ensuring reliable function. Furthermore, this invention achieves internal air pressure balance by creating a cavity and through hole between the connector and the inner cone, and installing a central pin within the cavity. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of an existing shear pin coupling.

[0016] Figure 2 This is a schematic diagram of the structure of an internally guided hydraulic cylinder shear pin type torque limiter according to this utility model.

[0017] Figure 3 This utility model relates to an internally guided hydraulic cylinder shear pin type torque limiter. Figure 2Sectional view at point AA.

[0018] Figure 4 This utility model relates to an internally guided hydraulic cylinder shear pin type torque limiter. Figure 2 Sectional view at point CC.

[0019] The attached diagram is labeled as follows: 1. Housing, 2. Connecting part, 3. Shear pin, 4. Cover plate, 5. Cylinder plunger rod head flange, 6. Center pin, 7. Cavity, 8. Inner cone, 9. Threaded hole, 10. Cylinder plunger rod, 11. Cylindrical pin, 12. Flat key, 13. Drive shaft, 14. Shear pin, 15. Pin sleeve one, 16. Pin sleeve two, 17. Gasket, 18. Locking double nut, 19. Driven shaft. Detailed Implementation

[0020] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings:

[0021] like Figures 1-4 As shown, an internally guided hydraulic cylinder shear pin type torque limiter includes a housing 1, a connecting piece 2, and a shear pin 3. The housing 1 has a tubular structure, and a flange is provided on the upper part of the housing 1 for connecting to the ingot platform of the casting machine.

[0022] The housing 1 is provided with a connector 2, the lower part of which is fixedly connected to the top of the cylinder plunger rod 10; specifically, the connector 2 is connected to the cylinder plunger rod head flange 5; a cylindrical pin 11 for connection and positioning is also provided between the connector 2 and the top of the cylinder plunger rod 10. In this embodiment, the cylinder is a hollow plunger type cylinder and the cylinder plunger rod 10 is a hollow plunger.

[0023] The upper part of the connector 2 is provided with a cover plate 4, and at least one interconnected hole is opened between the cover plate 4 and the connector 2. The shear pin 3 is disposed in the hole. In this embodiment, two interconnected holes are opened between the cover plate 4 and the connector 2, and shear pin 3 is disposed in both of the two holes. The shear pin 3 is fixedly connected to the cover plate 4 by bolts.

[0024] To facilitate the disassembly or replacement of the shear pin 3, the cover plate 4 and the connector 2 are provided with multiple threaded holes 9 in the circumferential direction. The threaded holes 9 are used to install set screws. When it is necessary to disassemble the cover plate 4 or the connector 2, the set screws are screwed downwards to press against the lower part, so that the cover plate 4 or the connector 2 is raised and removed from the housing 1.

[0025] To facilitate torque transmission, a transmission component is provided between the cover plate 4 and the housing 1. The transmission component is a flat key 12. Specifically, a keyway is provided at the connection between the cover plate 4 and the housing 1, and the flat key 12 is disposed in the keyway.

[0026] In use, the connecting piece 2 is fixedly connected to the flange 5 at the head of the cylinder plunger rod. After the cover plate 4 is placed on the upper part of the connecting piece 2, the shear pin 3 is inserted and fixed to the cover plate 4 with bolts. The flange of the housing 1 is connected to the ingot-drawing platform of the casting machine with bolts. During normal production, the cylinder plunger rod 10, the connecting piece 2, the cover plate 4, and the housing 1 work together to lift or lower, thereby enabling normal casting production of the ingot-drawing platform or slab ingot at the top of the casting machine. Once an abnormal torque is transmitted to the ingot-drawing platform, the resulting torsional shear force will be transmitted to the shear pin 3 through the ingot-drawing platform, the flat key 12, and the cover plate 4, thereby shearing the shear pin 3 and protecting the lower cylinder and its internal components from damage. The upper and lower flange holes of this utility model can be sealed with thread-locking adhesive, which can effectively isolate moisture and dirt, prevent foreign objects from entering and causing wear or corrosion, and prevent the torque limiter from failing or becoming difficult to disassemble.

[0027] To optimize the product structure and balance the air pressure within the cylinder plunger rod 10, an inner cone 8 is provided at the center of the top flange of the cylinder plunger rod 10. A cavity 7 is formed between the inner cone 8 and the connecting piece 2. The upper part of the cavity 7 has a bucket-shaped structure, and the lower part has a threaded hole 9. A central pin 6 is provided inside the cavity 7, which is clearance-fitted with the cavity 7. A through hole is provided at the bottom of the inner cone, which connects the inner cavity of the cylinder plunger rod 10 and the cavity 7. The head flange 5 of the cylinder plunger rod is clearance-fitted with the connecting piece 2, and the connecting piece 2 and the cover plate 4 are clearance-fitted with the housing 1.

[0028] The diameter of the through hole is less than or equal to 3 mm. In this embodiment, the diameter of the through hole is 1 mm to prevent debris from entering the plunger cylinder due to excessively large hole diameter, which would cause contamination of the plunger cylinder cavity and affect the use of the plunger cylinder.

[0029] When the air pressure inside the cylinder plunger rod 10 is too high, the gas passes through the through hole into the cavity 7, lifts the central pin 6, and then exits from the cavity 7, the gap between the cylinder plunger rod head flange 5 and the connecting piece 2, the gap between the connecting piece 2 and the housing 1, and the gap between the cover plate 4 and the housing 1. This achieves the effect of air pressure balance.

[0030] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the patent claims of this utility model should be included within the scope of the patent application of this utility model.

Claims

1. A type of internally guided hydraulic cylinder shear pin torque limiter, characterized in that, The device includes a housing (1) and a connector (2). The top of the housing (1) is connected to the device being lifted. The connector (2) is located inside the housing (1), and the lower part of the connector (2) is fixedly connected to the cylinder piston rod head flange (5). A cover plate (4) is provided on the upper part of the connector (2), and a shear pin (3) is provided between the cover plate (4) and the connector (2). A transmission component for transmitting torque is provided between the cover plate (4) and the housing (1).

2. The internally guided hydraulic cylinder shear pin type torque limiter according to claim 1, characterized in that, At least one interconnected hole is provided between the cover plate (4) and the connector (2), and a shear pin (3) is provided in each hole. The shear pin (3) is fixedly connected to the cover plate (4).

3. The internally guided hydraulic cylinder shear pin type torque limiter according to claim 1, characterized in that, The transmission component is a flat key (12), and a keyway is provided at the connection between the housing (1) and the upper cover plate (4), and the flat key (12) is set in the keyway.

4. The internally guided hydraulic cylinder shear pin type torque limiter according to claim 1, characterized in that, A cylindrical pin (11) is also provided between the top of the connector (2) and the cylinder plunger rod (10).

5. The internally guided hydraulic cylinder shear pin type torque limiter according to claim 1, characterized in that, An inner cone (8) is provided at the center of the head flange (5) of the cylinder plunger rod. A cavity (7) is provided between the inner cone (8) and the connecting piece (2). The cavity (7) is connected to the inside of the cylinder plunger rod (10). A central pin (6) is provided inside the cavity (7) and is clearance-fitted with the cavity (7).

6. The internally guided hydraulic cylinder shear pin type torque limiter according to claim 5, characterized in that, The inner cone (8) has a through hole at the bottom, which connects the inside of the cylinder plunger rod (10) and the cavity (7); the cylinder plunger rod head flange (5) is clearance-fitted with the connector (2), and the connector (2) and the cover plate (4) are clearance-fitted with the housing (1).

7. A shear pin type torque limiter for an internally guided hydraulic cylinder according to claim 6, characterized in that, The diameter of the through hole is less than or equal to 3 mm.

8. The internally guided hydraulic cylinder shear pin type torque limiter according to claim 1, characterized in that, Both the cover plate (4) and the connector (2) have threaded holes (9) for lifting at their center.

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