Hydraulic cylinder with integrated piston rod

Abstract

The utility model relates to a hydraulic cylinder with integrated piston rod, including cylinder body, cylinder cover and integrated piston rod. Among them, the cylinder body is hollow structure, and the length direction one end is closed, and the other end is open. The one end of cylinder body is provided with cylinder cover. The cylinder cover is provided with the piston rod hole that integrated piston rod passes. Integrated piston rod includes the ear ring part of stem and. The one end of stem is provided with the piston and passes into the cylinder body through the piston rod hole, and can slip along the own axial direction in the cylinder body, and the other end forms integrated structure with ear ring part. The ear ring part is annular, is used for connecting integrated piston rod other equipment. The piston divides the cylinder body inside into the rod cavity and the rod cavity. The cylinder body is provided with hydraulic passage and exhaust passage. The utility model discloses through adopt integrated piston, makes the stem and ear ring part between will not loosen or fail because of long -time use, has improved the reliability of hydraulic cylinder whole.

Description

Technical Field

[0001] This utility model relates to the technical field of hydraulic cylinders, and in particular to a hydraulic cylinder with an integrated piston rod. Background Technology

[0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy, performing linear reciprocating or oscillating motion. It has a simple structure and reliable operation. When used to achieve reciprocating motion, it eliminates the need for a speed reduction device, eliminates transmission backlash, and provides smooth movement. Therefore, it is widely used in the hydraulic systems of various machines.

[0003] Existing hydraulic cylinders typically consist of a cylinder body, a cylinder head, and a piston rod. The cylinder head seals the cylinder body. The piston rod passes through the cylinder head and then into the cylinder body. For easy connection to other equipment, a threaded lug is attached to the end of the piston rod outside the cylinder body. The lug is secured to the piston rod with a locating screw. The lug has a connection hole for connecting other equipment.

[0004] Because the piston rod and the lug are connected by threads and locked by a positioning screw, the lug and piston rod are prone to loosening or failure over time, resulting in poor reliability of the hydraulic cylinder. Utility Model Content

[0005] To address the aforementioned technical problems, this application provides a hydraulic cylinder with an integrated piston rod.

[0006] The technical solution provided by this utility model is as follows:

[0007] A hydraulic cylinder with an integrated piston rod includes a cylinder body, a cylinder head, and an integrated piston rod. The cylinder body is hollow, with one end closed and the other open along its length. A cylinder head is located at the open end of the cylinder body. A piston rod hole is provided on the cylinder head for the integrated piston rod to pass through. The integrated piston rod includes a rod body and an ear loop portion. One end of the rod body is fitted with a piston and passes through the piston rod hole into the cylinder body, and can slide along its own axis within the cylinder body. The other end forms an integrated structure with the ear loop portion. The ear loop portion is annular and used to connect the integrated piston rod to other equipment. The piston divides the interior of the cylinder body into a rod chamber and a rodless chamber. A hydraulic passage and an exhaust passage are provided on the cylinder body. The hydraulic passage communicates with the rodless chamber and is used to regulate the pressure within the rodless chamber. The exhaust passage communicates with the rod chamber and is used to discharge gas from the rod chamber.

[0008] Optionally, the rod is cylindrical.

[0009] Optionally, the length of the rod is between 4000mm and 4500mm; the diameter of the rod is between 300mm and 400mm.

[0010] Optionally, a buffer plunger is coaxially connected to one end of the rod inside the cylinder; the inner bottom surface of the closed end of the cylinder is the cylinder bottom; a buffer groove is formed on the cylinder bottom, which can accommodate the buffer plunger; when the rod extends out of the cylinder at its shortest stroke, the buffer plunger abuts against the bottom surface of the buffer groove.

[0011] Optionally, a spring retainer is provided around the buffer plunger at the connection between the buffer plunger and the rod; when the buffer plunger abuts against the bottom surface of the buffer groove, the spring retainer abuts against the edge of the opening of the buffer groove.

[0012] Optionally, a support ring is fitted on the circumferential side of the piston; the circumferential side of the support ring is in contact with the inner wall of the cylinder.

[0013] Optionally, a guide sleeve is provided inside the cylinder; the guide sleeve has a guide hole; the rod passes coaxially through the guide hole and can slide within the guide hole.

[0014] Optionally, an annular groove is formed inside the piston rod hole; a dustproof ring is provided in the annular groove; the dustproof ring is embedded in the annular groove; the rod passes through the dustproof ring and enters the cylinder body; the dustproof ring is used to seal the gap between the rod and the piston rod hole.

[0015] As described above, the hydraulic cylinder with an integrated piston rod of this invention has at least the following beneficial effects:

[0016] Compared with existing technologies, the hydraulic cylinder with an integrated piston rod of this invention improves the overall reliability of the hydraulic cylinder by using an integrated piston, preventing the rod body and lug part from loosening or failing due to prolonged use. Furthermore, the use of a support ring and guide sleeve structure prevents the integrated piston rod from deviating in the direction of extension and retraction, further enhancing the reliability of the hydraulic cylinder. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the hydraulic cylinder with an integrated piston rod according to this utility model.

[0018] Figure 2 This is a schematic diagram showing the shape of the one-piece piston rod before it is formed into the earring part.

[0019] Figure 3 This is a cross-sectional view of the shape of the one-piece piston rod before it is formed into the earring part.

[0020] Figure 4 This is a schematic diagram of an integrated piston rod structure.

[0021] Figure 5 yes Figure 4 A cross-sectional view along the AA direction.

[0022] Reference numerals: 1. Cylinder block; 11. Mounting handle; 12. Mounting hole; 2. Cylinder head; 21. Piston rod hole; 22. Annular groove; 23. Dust seal; 3. One-piece piston rod; 31. Rod body; 33. Earring part; 34. Piston; 4. Hydraulic passage; 5. Exhaust passage; 6. Cylinder bottom; 61. Buffer groove; 7. Buffer plunger; 71. Spring retainer ring; 8. Support ring; 9. Guide sleeve; 91. Guide hole. Detailed Implementation

[0023] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. It should also be understood that the terminology used in the embodiments of this utility model is for describing specific implementation schemes and not for limiting the scope of protection of this utility model. Test methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions or according to the conditions recommended by the respective manufacturers.

[0024] It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of implementation of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this utility model, should still fall within the scope of the technical content disclosed in this utility model. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of implementation of this utility model.

[0025] Please refer to Figures 1-3This utility model discloses a hydraulic cylinder with an integrated piston rod, characterized by comprising a cylinder body 1, a cylinder head 2, and an integrated piston rod 3. The cylinder body 1 is a hollow structure, closed at one end along its length and open at the other. The cylinder head 2 is located at the open end of the cylinder body 1. The cylinder head 2 has a piston rod hole 21 for the integrated piston rod 3 to pass through. The integrated piston rod 3 includes a rod body 31 and an ear loop portion 33. One end of the rod body 31 is fitted with a piston 34 and passes through the piston rod hole 21 into the cylinder body 1, and can slide along its own axis within the cylinder body 1. The other end forms an integrated structure with the ear loop portion 33. The ear loop portion 33 is annular and is used to connect the integrated piston rod 3 to other equipment. The piston 34 divides the interior of the cylinder body 1 into a rod chamber and a rodless chamber. The cylinder body 1 is provided with a hydraulic passage 4 and an exhaust passage 5. The hydraulic passage 4 communicates with the rodless chamber and is used to regulate the pressure within the rodless chamber. The exhaust passage 5 is connected to the rod chamber and is used to exhaust the gas in the rod chamber.

[0026] Specifically, the cylinder body 1 is cylindrical, with a mounting handle 11 fixedly connected to its closed end. The mounting handle 11 is semi-circular. The side of the mounting handle 11 corresponding to the diameter of the semi-circle is integrally formed or welded to the closed end of the cylinder body 1. Mounting holes 12 are formed or opened on the mounting handle 11. The mounting holes 12 allow for the installation and fixation of the cylinder body 1 to other equipment. The cylinder cover 2 is fastened to the open end of the cylinder body 1. The cylinder cover 2 can be welded to the cylinder body 1.

[0027] Since the rod 31 of the integrated piston rod 3 passes through the piston rod hole 21 of the cylinder head 2, poor sealing between the rod 31 and the piston rod hole 21 will affect the normal operation of the hydraulic cylinder. To ensure the normal operation of the hydraulic cylinder, in a preferred embodiment of this utility model, an annular groove 22 is provided inside the piston rod hole 21. A dustproof ring 23 is provided inside the annular groove 22. The dustproof ring 23 is embedded in the annular groove 22. The rod 31 passes through the dustproof ring 23 and enters the cylinder body 1. The dustproof ring 23 is used to seal the gap between the rod 31 and the piston rod hole 21. The dustproof ring 23 is elastic, and its width in the diametrical direction is greater than the depth of the annular groove 22, so that after the dustproof ring 23 is embedded in the annular groove 22, a part of the dustproof ring 23 protrudes out of the annular groove 22. The elastic contact between the dustproof ring 23 and the rod 31 maintains the sealing between the piston rod hole 21 and the rod 31.

[0028] Please refer to Figures 2-4 The rod body 31 is cylindrical. The rod body 31 and the earring portion 33 form an integral structure, meaning the integral piston rod 3 is first processed through forging and turning processes to achieve this shape. Figure 2 , Figure 3 The shape shown is a cylinder connected to a cuboid, and the cuboid portion is then processed into an earring portion 33, forming a shape like... Figure 3 , Figure 4 The structure shown.

[0029] To ensure the overall mechanical strength of the rod 31, in a preferred embodiment of this invention, the length of the rod 31 is between 4000mm and 4500mm, for example, 4000mm, 4100mm, 4200mm, 4300mm, 4400mm, or 4500mm. The diameter of the rod 31 is between 300mm and 400mm, for example, 300mm, 350mm, or 400mm.

[0030] When rod 31 slides, if the end of rod 31 inside cylinder 1 directly contacts the inner bottom surface of the closed end of cylinder 1, it can easily damage cylinder 1. To avoid direct contact between rod 31 and cylinder 1, a buffer plunger 7 is coaxially connected to the end of rod 31 inside cylinder 1. The inner bottom surface of the closed end of cylinder 1 is cylinder bottom 6. A buffer groove 61 is formed on cylinder bottom 6, which can accommodate the buffer plunger 7. When the stroke of rod 31 extending out of cylinder 1 is at its shortest, the buffer plunger 7 abuts against the bottom surface of buffer groove 61.

[0031] Specifically, the buffer plunger 7 is cylindrical in shape, with one end fixedly connected to the end of the rod 31 located inside the cylinder 1, and the diameter of the other end gradually decreasing. The buffer plunger 7 is made of elastic material and replaces the rod 31 in contact with the bottom surface of the buffer groove 61, thereby effectively avoiding direct contact between the rod 31 and the cylinder 1, which could cause damage to the cylinder 1.

[0032] After the buffer plunger 7 is installed, although the rod 31 will not contact the bottom surface of the buffer groove 61, due to the elasticity of the buffer plunger 7, the rod 31 may still directly contact the part of the cylinder bottom 6 located around the buffer groove 61. Therefore, a spring retainer 71 is provided around the connection between the buffer plunger 7 and the rod 31. When the buffer plunger 7 abuts against the bottom surface of the buffer groove 61, the spring retainer 71 abuts against the edge of the opening of the buffer groove 61, thereby preventing damage to the cylinder body 1 caused by direct contact between the rod 31 and the part of the cylinder bottom 6 located around the buffer groove 61.

[0033] Please continue to refer to Figure 1 Based on the function of the integrated piston rod 3, the extension and retraction direction of the integrated piston rod 3 should not deviate during its extension and retraction. To reduce the deviation in the extension and retraction direction of the integrated piston rod 3 during its extension and retraction, a support ring 8 is fitted on the circumferential side of the piston 34. The circumferential side of the support ring 8 contacts the inner wall of the cylinder 1. The axis of the support ring 8 coincides with the axis of the rod 31 and the axis of the cylinder 1. The outer diameter of the support ring 8 is adapted to the inner diameter of the cylinder 1, and the support ring 8 is made of wear-resistant material. This allows the support ring 8 to restrict the extension and retraction direction of the integrated piston rod 3 and, instead of the piston 34 rubbing against the inner wall of the cylinder 1, reduce the wear of the piston 34.

[0034] Furthermore, a guide sleeve 9 is provided inside the cylinder block 1. The guide sleeve 9 is located on the side of the support ring 8 near the cylinder head 2. The guide sleeve 9 has a guide hole 91. The rod 31 coaxially passes through the guide hole 91 and can slide within the guide hole 91. Unlike the support ring 8, the guide sleeve 9 does not move with the sliding of the rod 31. By cooperating with the support ring 8, it can further restrict the extension and retraction direction of the integrated piston rod 3, ensuring that the extension and retraction direction of the integrated piston rod 3 does not deviate during the extension and retraction process.

[0035] Compared with the prior art, the hydraulic cylinder with an integrated piston rod of this invention improves the overall reliability of the hydraulic cylinder by using an integrated piston, preventing the rod body 31 and the lug part 33 from loosening or failing due to prolonged use. Furthermore, the structure of the support ring 8 and guide sleeve 9 ensures that the extension and retraction direction of the integrated piston rod 3 is less prone to deviation during extension and retraction, further enhancing the reliability of the hydraulic cylinder.

[0036] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A hydraulic cylinder with an integrated piston rod, characterized by: It includes a cylinder block (1), a cylinder head (2), and an integrated piston rod (3); among which, The cylinder body (1) is a hollow structure, with one end closed and the other end open in the length direction; a cylinder cover (2) is provided on the open end of the cylinder body (1); a piston rod hole (21) is provided on the cylinder cover (2) for the integrated piston rod (3) to pass through; The integrated piston rod (3) includes a rod body (31) and an ear loop portion (33); one end of the rod body (31) is fitted with a piston (34) and passes through the piston rod hole (21) into the cylinder (1), and can slide along its own axis within the cylinder (1); the other end forms an integrated structure with the ear loop portion (33); the ear loop portion (33) is annular and is used to connect the integrated piston rod (3) to other equipment; The piston (34) divides the interior of the cylinder (1) into a rod chamber and a rodless chamber; the cylinder (1) is provided with a hydraulic channel (4) and an exhaust channel (5); the hydraulic channel (4) is connected to the rodless chamber and is used to adjust the pressure in the rodless chamber; the exhaust channel (5) is connected to the rod chamber and is used to discharge the gas in the rod chamber.

2. Hydraulic cylinder with integrated piston rod according to claim 1, characterized in that The rod (31) is cylindrical.

3. Hydraulic cylinder with integrated piston rod according to claim 2, characterized in that The length of the rod (31) is between 4000mm and 4500mm; the diameter of the rod (31) is between 300mm and 400mm.

4. The hydraulic cylinder with an integrated piston rod according to claim 1, characterized in that: One end of the rod (31) located inside the cylinder (1) is coaxially connected to a buffer plunger (7); The inner bottom surface of the closed end of the cylinder body (1) is the cylinder bottom (6); a buffer groove (61) is formed on the cylinder bottom (6), and the buffer groove (61) can accommodate the buffer plunger (7); when the rod (31) extends out of the cylinder body (1) with the shortest stroke, the buffer plunger (7) abuts against the bottom surface of the buffer groove (61).

5. Hydraulic cylinder with integrated piston rod according to claim 4, characterized in that: At the connection between the buffer plunger (7) and the rod (31), a spring retainer (71) is provided around the buffer plunger (7); when the buffer plunger (7) abuts against the bottom surface of the buffer groove (61), the spring retainer (71) abuts against the edge of the opening of the buffer groove (61).

6. Hydraulic cylinder with integrated piston rod according to claim 5, characterized in that A support ring (8) is fitted on the circumferential side of the piston (34); The circumferential side of the support ring (8) is in contact with the inner wall of the cylinder (1).

7. The hydraulic cylinder with an integrated piston rod according to claim 6, characterized in that, A guide sleeve (9) is provided inside the cylinder body (1); the guide sleeve (9) is located on the side of the support ring (8) near the cylinder head (2); The guide sleeve (9) has a guide hole (91); the rod (31) passes coaxially through the guide hole (91) and can slide in the guide hole (91).

8. The hydraulic cylinder with integrated piston rod of claim 1, characterized in that An annular groove (22) is provided inside the piston rod hole (21); A dustproof ring (23) is provided inside the annular groove (22); the dustproof ring (23) is embedded in the annular groove (22); The rod body (31) passes through the dustproof ring (23) into the cylinder body (1); the dustproof ring (23) is used for plugging the gap between the rod body (31) and the piston rod hole (21).

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