Pressing machine sub-oil cylinder

Abstract

The utility model discloses a kind of mother and child oil cylinders of buckling press, belong to mechanical equipment technical field, the mother and child oil cylinders of this buckling press, including mother cylinder, the inside of the mother cylinder is slidably connected with main piston rod, the top of the main piston rod is equipped with multiple mounting holes, the inside of the mother cylinder is installed with the guiding assembly corresponding with main piston rod, the inside of the main piston rod is installed with daughter cylinder, the inside of the daughter cylinder is installed with daughter piston rod.The utility model provides solid guarantee for the stable operation of the mother and child oil cylinders of buckling press by setting guiding assembly in the inner wall of mother cylinder, the guide sleeve in guiding assembly is installed in the inner wall of mother cylinder, it is connected with the inner wall of mother cylinder using interference fit mode, by dint of strong friction force generated by interference, radial force and vibration impact generated when main piston is in high-frequency reciprocating motion can be effectively resisted, ensure that guide sleeve is stable and does not displace, looseness, always play precise guiding role.

Description

Technical Field

[0001] This utility model relates to the field of mechanical equipment technology, and in particular to a hydraulic cylinder for a crimping machine. Background Technology

[0002] In modern industrial manufacturing, crimping machines, as key equipment for achieving tight connections between pipe fittings and connectors, are widely used in various industries such as hydraulic pipelines, automotive parts, construction machinery, and aerospace. From the connection of pipes in automotive braking systems to the assembly of pipe fittings in hydraulic systems of construction machinery, crimping machines apply precise pressure to firmly fasten pipe fittings and connectors, ensuring the sealing and structural strength of the connection. Their performance directly affects the quality and reliability of the end product. As the core component of the crimping machine that realizes pressure output and action execution, the design and performance of the hydraulic cylinder play a decisive role in the working efficiency, crimping accuracy, and stability of the crimping machine.

[0003] Traditional crimping machine cylinders mostly adopt a single-stage cylinder structure. When faced with crimping requirements for pipe fittings of different specifications and materials, single-stage cylinders cannot simultaneously handle large strokes and high pressure outputs. If a large stroke is pursued, the cylinder size and weight will increase significantly, resulting in a bulky overall equipment structure and increased energy consumption. The hydraulic oil flow channel design of traditional cylinders is relatively simple, and problems such as turbulence and pressure fluctuations are easily generated during the oil entering and leaving the cylinder. This not only reduces the transmission efficiency of the hydraulic system, but also causes cylinder vibration and noise, affecting crimping accuracy and equipment lifespan.

[0004] Therefore, there is an urgent need to provide a crimping machine with a male and female hydraulic cylinder to solve the above problems. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a crimping machine hydraulic cylinder.

[0006] To solve the above-mentioned technical problems, the present invention provides a crimping machine cylinder, including a female cylinder, a main piston rod slidably connected inside the female cylinder, a plurality of mounting holes being provided on the top of the main piston rod, and a guide assembly corresponding to the main piston rod being installed inside the female cylinder.

[0007] The main piston rod is equipped with a sub-cylinder, and the sub-cylinder is equipped with a sub-piston rod. The sub-piston rod has a rod chamber and a rodless chamber. The bottom of the main cylinder has an oil inlet, an oil return port and multiple reserved holes. The outer wall of the main cylinder has an air inlet and outlet near the top.

[0008] The present invention is further configured such that: an exhaust port is provided on the outer wall of the mother cylinder, and a conical guide shroud is provided at the exhaust port, wherein the large end of the conical guide shroud faces the inside of the mother cylinder and the small end faces the exhaust port.

[0009] With the above technical solution, when the exhaust port is open, the conical structure can prevent external dust, particles and other impurities from directly entering the oil cylinder. When the exhaust port is closed, the oil residue on the inner wall of the guide shield can also form a temporary oil seal, further isolating external pollutants.

[0010] The present invention is further configured such that: the outer wall of the main piston rod is provided with an annular sealing groove, and a combined sealing element is installed in the sealing groove.

[0011] The above technical solution provides an annular sealing groove on the outer wall of the main piston rod, which can provide a precise and stable installation space for the combined seal, ensuring that the seal is always in the preset sealing position.

[0012] The present invention is further configured such that: the guide assembly includes a guide sleeve installed on the inner wall of the mother cylinder, and a locking nut corresponding to the guide sleeve is installed on the top of the guide sleeve.

[0013] Through the above technical solution, during the operation of the male and female cylinders of the crimping machine, the guide sleeve on the inner wall of the female cylinder provides precise guidance for the reciprocating motion of the main piston rod, ensuring that the piston moves stably along the predetermined trajectory and avoiding jamming and wear due to deviation. The locking nut rotatably connected to the outer wall of the guide sleeve can be tightened by rotation after the guide sleeve is installed in place, thereby securing and limiting the guide sleeve axially.

[0014] The present invention is further configured such that: the guide sleeve is connected to the inner wall of the mother cylinder by an interference fit, and the inner wall of the guide sleeve is provided with a wear-resistant coating.

[0015] Through the above technical solution, the guide sleeve and the inner wall of the mother cylinder are connected by an interference fit, which allows the two to fit tightly together and form a solid mechanical connection. The friction generated by the interference fit effectively resists the radial force and vibration impact generated when the main piston rod moves, preventing the guide sleeve from shifting or loosening on the inner wall of the mother cylinder, and ensuring the stable operation of its guiding function. The wear-resistant coating on the inner wall of the guide sleeve greatly reduces the coefficient of friction between it and the main piston rod, making the piston movement smoother and more fluid, reducing wear and tear, and extending the service life of the guide sleeve and the piston.

[0016] The present invention is further configured such that: the inner wall of the rod cavity is provided with a spiral guide groove, and the spiral direction of the spiral guide groove is adapted to the hydraulic oil entry direction.

[0017] Through the above technical solution, the hydraulic oil entering the rod chamber is guided in a regular manner by its unique spiral trajectory, so that the oil forms a stable spiral flow state during the flow process, effectively dispersing the oil impact force, avoiding pressure fluctuations and vibrations caused by turbulence, and allowing the hydraulic oil to enter the sub-cylinder more smoothly and evenly, ensuring the smoothness of the sub-piston rod movement and improving the accuracy of the crimping operation of the crimping machine.

[0018] The beneficial effects of this utility model are as follows:

[0019] 1. This utility model provides a solid guarantee for the stable operation of the male and female cylinders of the crimping machine by setting a guide component on the inner wall of the female cylinder. The guide sleeve in the guide component is installed on the inner wall of the female cylinder and is connected to the inner wall of the female cylinder by an interference fit. With the strong friction generated by the interference fit, it can effectively resist the radial force and vibration impact generated by the main piston during high-frequency reciprocating motion, ensuring that the guide sleeve is stable and does not shift or loosen, and always plays a precise guiding role.

[0020] 2. This utility model, by combining the rod cavity inside the piston rod with a spiral guide groove, can regularly guide the hydraulic oil to form a stable flow state, disperse the oil impact force, reduce pressure fluctuations and vibrations caused by turbulence, and allow the hydraulic oil to enter the sub-cylinder smoothly and evenly, ensuring the smooth movement of the piston rod, thereby improving the accuracy of the crimping operation of the crimping machine. Attached Figure Description

[0021] Figure 1 This is a perspective view of the present utility model;

[0022] Figure 2 This is a schematic diagram of the bottom structure of the main piston rod of this utility model;

[0023] Figure 3 This is a schematic diagram of the internal structure of the main piston rod of this utility model;

[0024] Figure 4 This is an exploded view of the present invention.

[0025] In the diagram: 1. Mother cylinder; 2. Main piston rod; 3. Mounting hole; 4. Guide sleeve; 5. Locking nut; 6. Daughter cylinder; 7. Daughter piston rod; 8. Rod chamber; 9. Rodless chamber; 10. Oil inlet; 11. Oil return port; 12. Reserved hole; 13. Air inlet and outlet. Detailed Implementation

[0026] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0027] Please see Figure 1 - Figure 4A crimping machine cylinder includes a female cylinder 1. An exhaust port is located on the bottom of the outer wall of the female cylinder 1. A conical guide shield is provided at the exhaust port on the outer wall of the female cylinder 1, with the larger end of the conical guide shield facing the inside of the female cylinder 1 and the smaller end facing the exhaust port. When the exhaust port is open, the conical structure can prevent external dust, particles, and other impurities from directly entering the cylinder. When the exhaust port is closed, the oil residue on the inner wall of the guide shield can form a temporary oil seal, further isolating external contaminants. A main piston rod 2 is slidably connected inside the female cylinder 1. An annular sealing groove is provided on the outer wall of the main piston rod 2, and a combined seal is installed in the sealing groove. The annular sealing groove on the outer wall of the main piston rod 2 provides a precise and stable installation space for the combined seal, ensuring that the seal is always in a preset sealing position. Multiple mounting holes 3 are provided on the top of the main piston rod 2.

[0028] like Figure 3 As shown, the mother cylinder 1 is equipped with a guide assembly corresponding to the main piston rod 2. The guide assembly includes a guide sleeve 4 installed on the inner wall of the mother cylinder 1. The guide sleeve 4 is connected to the inner wall of the mother cylinder 1 by an interference fit, and the inner wall of the guide sleeve 4 is provided with a wear-resistant coating. The interference fit between the guide sleeve 4 and the inner wall of the mother cylinder 1 allows them to fit tightly together, forming a strong mechanical connection. The friction generated by the interference fit effectively resists the radial force and vibration impact generated when the main piston rod 2 moves, preventing the guide sleeve 4 from shifting or loosening on the inner wall of the mother cylinder 1, and ensuring the stable operation of its guiding function. The inner wall of the guide sleeve 4 is provided with a wear-resistant coating. The wear-resistant coating greatly reduces the coefficient of friction between the guide sleeve 4 and the main piston rod 2, making the piston movement smoother and more fluid, reducing wear and tear, and extending the service life of the guide sleeve 4 and the piston. The outer wall of the guide sleeve 4 is rotatably connected to the locking nut 5. During the operation of the crimping machine's male and female cylinders, the guide sleeve 4 on the inner wall of the female cylinder 1 provides precise guidance for the reciprocating motion of the main piston rod 2, ensuring that the piston moves stably along the predetermined trajectory and avoiding jamming and wear due to deviation. The locking nut 5 rotatably connected to the outer wall of the guide sleeve 4 can be tightened by rotation after the guide sleeve 4 is installed in place, thus securing and limiting the guide sleeve 4 axially.

[0029] like Figure 1 - Figure 4As shown, a sub-cylinder 6 is installed inside the main piston rod 2, and a sub-piston rod 7 is installed inside the sub-cylinder 6. The sub-piston rod 7 has a rod chamber 8 and a rodless chamber 9. The inner wall of the rod chamber 8 is provided with a spiral guide groove. The spiral guide groove is adapted to the direction of hydraulic oil entry. With its unique spiral trajectory, it guides the hydraulic oil entering the rod chamber 8 in a regular manner, so that the oil forms a stable spiral flow state during the flow process, effectively dispersing the oil impact force and avoiding pressure fluctuations and vibrations caused by turbulence. This allows the hydraulic oil to enter the sub-cylinder 6 more smoothly and evenly, ensuring the smoothness of the movement of the sub-piston rod 7 and improving the accuracy of the crimping operation of the crimping machine. The bottom of the mother cylinder 1 is provided with an oil inlet 10, an oil return port 11, and multiple reserved holes 12. The outer wall of the mother cylinder 1 is provided with an air inlet and outlet hole 13 near the top. Whether the cylinder is rising or falling, there is no hydraulic oil inside the upper wall of the cylinder. Therefore, air intake and exhaust are achieved through the air inlet and outlet hole 13.

[0030] When this utility model is in use, when the main piston rod 2 needs to be pushed out quickly, the hydraulic oil preferentially enters the sub-cylinder 6 through the rodless chamber 9 of the sub-piston rod 7. Because the working area of ​​the sub-piston rod 7 is small, it can generate a higher movement speed under the same flow rate, thereby driving the main piston rod 2 to move upward quickly in the mother cylinder 1. The combined seal in the annular sealing groove on the outer wall of the main piston rod 2 prevents hydraulic oil leakage. The guide sleeve 4 at the top of the inner wall of the mother cylinder 1 cooperates with the locking nut 5 to ensure that the trajectory of the main piston rod 2 is accurate when it moves quickly. When the hydraulic oil is discharged from the rodless chamber 9 of the sub-piston rod 7, the pressure decreases, and the sub-piston rod 7 drives the main piston rod 2 to quickly return to its original position downward.

[0031] When hydraulic oil enters from the bottom inlet 10 of the mother cylinder 1, it directly acts on the large surface area of ​​the main piston rod 2. According to Pascal's principle, under the condition of ensuring stable pressure, although the movement speed of the main piston rod 2 decreases, the output force increases significantly, which can effectively overcome the deformation resistance of the workpiece. At this time, the main piston rod 2 drives the sub-cylinder 6 and the sub-piston rod 7 to move slowly upward as a whole, accurately completing the crimping operation. When the crimping is completed, the hydraulic oil is discharged from the bottom return port 11 of the mother cylinder 1. After the pressure is released, the main piston rod 2 moves slowly downward to achieve reset.

[0032] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A crimping machine hydraulic cylinder, comprising a female cylinder (1), characterized in that: The main piston rod (2) is slidably connected inside the mother cylinder (1). The top of the main piston rod (2) is provided with multiple mounting holes (3). The guide assembly corresponding to the main piston rod (2) is installed inside the mother cylinder (1). The main piston rod (2) is equipped with a sub-cylinder (6), the sub-cylinder (6) is equipped with a sub-piston rod (7), the sub-piston rod (7) is provided with a rod chamber (8) and a rodless chamber (9) respectively, the bottom of the mother cylinder (1) is provided with an oil inlet (10), an oil return port (11) and a number of reserved holes (12), and the outer wall of the mother cylinder (1) is provided with an air inlet and outlet hole (13) near the top.

2. The crimping machine cylinder according to claim 1, characterized in that: The outer wall of the mother cylinder (1) is provided with an exhaust port, and a conical guide shield is provided at the exhaust port. The large end of the conical guide shield faces the inside of the mother cylinder (1), and the small end faces the exhaust port.

3. A crimping machine hydraulic cylinder according to claim 1, characterized in that: The outer wall of the main piston rod (2) is provided with an annular sealing groove, and a combined sealing element is installed in the sealing groove.

4. A crimping machine hydraulic cylinder according to claim 1, characterized in that: The guide assembly includes a guide sleeve (4) installed on the inner wall of the mother cylinder (1), and a locking nut (5) corresponding to the guide sleeve (4) is installed on the top of the guide sleeve (4).

5. A crimping machine hydraulic cylinder according to claim 4, characterized in that: The guide sleeve (4) is connected to the inner wall of the mother cylinder (1) by an interference fit, and the inner wall of the guide sleeve (4) is provided with a wear-resistant coating.

6. A crimping machine hydraulic cylinder according to claim 1, characterized in that: The inner wall of the rod cavity (8) is provided with a spiral guide groove, and the spiral direction of the spiral guide groove is adapted to the hydraulic oil entry direction.

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