A guide sleeve structure for an oil cylinder

Abstract

The utility model discloses a kind of guide sleeve structures for oil cylinder, including sleeve and dustproof mechanism, guide sleeve: its outer surface middle part is equipped with the outer thread of uniform distribution, dustproof mechanism: it includes dustproof ring groove, dustproof ring, baffle, internal thread hole and fixed bolt, the dustproof ring groove is opened on the inner wall upper end of guide sleeve, dustproof ring is set to the inside of dustproof ring groove, baffle is set to the upper end of guide sleeve, the lower end of baffle and the upper end edge of dustproof ring are pasted, this guide sleeve structure for oil cylinder is equipped with dustproof mechanism, by the limiting of baffle and annular protrusion, cooperate the deformation of annular cavity and the blocking of baffle, can form comprehensive limiting effect to dustproof ring, avoid the occurrence of the situation that dustproof ring is loose and falls off due to the frequent movement of piston rod, can also form positioning and limiting effect to guide sleeve, avoid the occurrence of the situation that guide sleeve is not fixed in place and loose.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder guide sleeve technology, specifically a guide sleeve structure for hydraulic cylinders. Background Technology

[0002] A hydraulic cylinder is an actuator that converts hydraulic energy into mechanical linear motion. It consists of core components such as a cylinder barrel, piston, piston rod, guide sleeve, and seals. It is widely used in engineering machinery, metallurgical equipment, and heavy equipment. The guide sleeve structure is particularly important. In existing hydraulic cylinders, the guide sleeve is threaded to the upper end of the cylinder barrel. The guide sleeve is machined from cast iron and has multiple grooves inside for installing dust rings, support rings, and sealing rings. The guide sleeve and seals cooperate to guide and seal the piston rod. Traditional guide sleeves are installed via threads... The lack of positioning and limiting makes it easy to install improperly, leading to loosening of the guide sleeve during subsequent operation. When installing seals, especially dust rings, the dust rings are only inserted into the corresponding mounting grooves by their own elastic deformation. When the piston rod frequently reciprocates, the movement of the piston rod will generate friction and inertia. The edges of the upper and lower ends of the inner wall of the dust ring contact the piston rod, causing the dust ring to easily tilt, loosen, or even fall off as the piston rod moves. This allows external impurities to enter the guide sleeve and damage the piston rod surface. To address this, we propose a guide sleeve structure for hydraulic cylinders. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the existing defects and provide a guide sleeve structure for hydraulic cylinders. It is equipped with a dustproof mechanism. Through the limiting of the retaining ring and the annular protrusion, the deformation of the annular cavity and the blocking of the baffle, the dustproof ring can be fully limited, which can prevent the dustproof ring from loosening and falling off due to the frequent movement of the piston rod. It can also provide positioning and limiting effects for the guide sleeve, which can prevent the guide sleeve from being not fixed in place or loosening. It can effectively solve the problems in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a guide sleeve structure for a hydraulic cylinder, comprising a sleeve and a dustproof mechanism;

[0005] Guide sleeve: Its outer surface has evenly distributed external threads in the middle;

[0006] Dustproof mechanism: It includes a dustproof ring groove, a dustproof ring, a baffle, internal threaded holes, and fixing bolts. The dustproof ring groove is opened at the upper end of the inner wall of the guide sleeve, and the dustproof ring is set inside the dustproof ring groove. The baffle is set at the upper end of the guide sleeve, and the lower end of the baffle fits against the upper edge of the dustproof ring. The internal threaded holes are evenly opened at the four corners of the upper end of the guide sleeve. The fixing bolts are all threaded into the internal threaded holes. The four corners of the baffle are all provided with through holes. The upper end of the outer surface of the fixing bolt penetrates the inner wall of the through hole. The top wall of the fixing bolt fits against the upper end of the baffle, providing a limiting effect for the upper end of the dustproof ring. With the dustproof mechanism, through the limiting of the retaining ring and the annular protrusion, the deformation of the annular cavity, and the blocking of the baffle, a comprehensive limiting effect can be formed on the dustproof ring, avoiding the dustproof ring from loosening and falling off due to the frequent movement of the piston rod. It can also form a positioning and limiting effect on the guide sleeve, avoiding the guide sleeve from being not fixed in place or loosening.

[0007] Furthermore, the dustproof ring includes a retaining ring, an annular protrusion, an annular groove, and a chamfer. The retaining ring is disposed on the upper end of the bottom wall of the dustproof ring groove. An annular notch is formed at the lower end of the inner wall of the dustproof ring, and the inner wall of the annular notch fits against the outer surface of the retaining ring. The annular protrusion is disposed on the upper end of the inner wall of the dustproof ring groove. The annular groove is formed at the upper end of the outer surface of the dustproof ring, and the inner wall of the annular groove engages with the outer surface of the annular protrusion. The chamfer is disposed in the middle of the outer surface of the dustproof ring and is fitted with the upper end of the annular protrusion to provide a limiting effect for the middle and lower ends of the dustproof ring.

[0008] Furthermore, the dustproof ring also includes an annular cavity, which is located at the lower inner edge of the dustproof ring. The annular cavity is installed in conjunction with the retaining ring and the annular protrusion, and the elastic deformation of the annular cavity can make the dustproof ring fit more tightly with the dustproof ring groove.

[0009] Furthermore, the dustproof ring also includes an annular groove and an annular lip. The annular groove is located at the upper middle part of the guide sleeve, and the annular lip is located at the lower edge of the dustproof ring. The outer surface of the annular lip engages with the inner wall of the annular groove, further improving the limiting effect provided by the upper end of the dustproof ring.

[0010] Furthermore, the dustproof mechanism also includes grooves and insertion holes. The grooves are evenly distributed on the upper edge of the guide sleeve, and the insertion holes are distributed at the four corners of the outer surface of the guide sleeve, which facilitates the assembly and disassembly of the guide sleeve.

[0011] Furthermore, it also includes a support ring groove, a support ring, a sealing ring groove, and a sealing ring. The support ring groove is respectively opened at the upper and lower ends of the inner wall of the guide sleeve, and the support ring is set inside the support ring groove. The sealing ring groove is opened in the middle of the inner wall of the guide sleeve, and the sealing ring is set inside the sealing ring groove, so as to provide guiding support and sealing effect for the movement of the piston rod.

[0012] Furthermore, it also includes sealing rings and sealing gaskets. The sealing rings are both located at the lower end of the outer surface of the guide sleeve, and the sealing gaskets are located at the lower end of the top wall of the guide sleeve, providing a sealing effect between the guide sleeve and the cylinder body.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: The guide sleeve structure of this hydraulic cylinder has the following advantages:

[0014] 1. The retaining ring and the annular protrusion limit the movement of the piston rod to prevent the dust seal from loosening and falling off. Combined with the deformation of the annular cavity, the dust seal at the annular cavity can fit more tightly with the dust seal groove. In addition, the blocking of the baffle plate and the locking effect of the annular groove and the annular lip can form a comprehensive limiting effect on the dust seal, preventing the dust seal from loosening and falling off due to the frequent movement of the piston rod.

[0015] 2. By using external tools to insert into the grooves and holes, the guide sleeve can be installed faster and with less effort. By matching the internal threaded hole with the cylinder mounting hole, it can be determined whether the guide sleeve has rotated into place. With the threaded connection between the fixing bolt and the mounting hole, the guide sleeve can be quickly positioned and limited, avoiding the occurrence of the guide sleeve not being fixed in place or loosening. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic cross-sectional view of the dustproof mechanism of this utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the sealing element of this utility model;

[0019] Figure 4 This is an enlarged structural schematic diagram of point A of the present invention.

[0020] In the diagram: 1 guide sleeve, 2 external thread, 3 dustproof mechanism, 31 dustproof ring groove, 32 dustproof ring, 321 retaining ring, 322 annular protrusion, 323 annular groove, 324 chamfer, 325 annular cavity, 326 annular slot, 327 annular lip, 33 baffle, 34 internal threaded hole, 35 fixing bolt, 36 groove, 37 insertion hole, 4 support ring groove, 5 support ring, 6 sealing ring groove, 7 sealing ring, 8 sealing ring, 9 sealing gasket. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-4 This embodiment provides a technical solution: a guide sleeve structure for a hydraulic cylinder, including a sleeve 1 and a dustproof mechanism 3;

[0023] Guide sleeve 1: Its outer surface has evenly distributed external threads 2 in the middle, used for threaded connection with the cylinder body. It also includes support ring grooves 4, support rings 5, sealing ring grooves 6, and sealing rings 7. Support ring grooves 4 are respectively opened at the upper and lower ends of the inner wall of guide sleeve 1. Support rings 5 ​​are all located inside the support ring grooves 4. The material of the support rings 5 ​​can be phenolic resin-reinforced fabric. Sealing ring grooves 6 are all opened in the middle of the inner wall of guide sleeve 1. Sealing rings 7 are all located inside the sealing ring grooves 6. Sealing rings 7 can be step seals. Step seals are generally... Composed of a rubber O-ring and a polytetrafluoroethylene (PTFE) ring, the O-ring serves as the force-applying element, providing sufficient sealing force and compensating for the PTFE ring. It is suitable for sealing hydraulic cylinder piston rods, providing guiding support and sealing effect for piston rod movement. It also includes a sealing ring 8 and a sealing gasket 9. The sealing ring 8 is located at the lower end of the outer surface of the guide sleeve 1, and the sealing gasket 9 is located at the lower end of the top wall of the guide sleeve 1. Both the sealing ring 8 and the sealing gasket 9 can be made of silicone to provide a sealing effect between the guide sleeve 1 and the cylinder body.

[0024] Dustproof mechanism 3: It includes a dustproof ring groove 31, a dustproof ring 32, a baffle 33, an internally threaded hole 34, and fixing bolts 35. The dustproof ring groove 31 is opened at the upper end of the inner wall of the guide sleeve 1. The dustproof ring 32 is set inside the dustproof ring groove 31. The material of the dustproof ring 32 can be polyurethane. The baffle 33 is set at the upper end of the guide sleeve 1. The lower end of the baffle 33 fits against the upper edge of the dustproof ring 32. The internally threaded holes 34 are evenly opened at the four corners of the upper end of the guide sleeve 1. The fixing bolts 35 are all threaded into the internally threaded holes 34. The four corners of the baffle 33 are all provided with through holes. The upper end of the outer surface of the fixing bolt 35 penetrates the inner wall of the through hole. The top wall of the fixing bolt 35 fits against the upper end of the baffle 33, providing a limit to the upper end of the dustproof ring 32. To achieve the desired effect, the dustproof ring 32 includes a retaining ring 321, an annular protrusion 322, an annular groove 323, and a chamfer 324. The retaining ring 321 is located at the upper end of the bottom wall of the dustproof ring groove 31. An annular notch is formed at the lower end of the inner wall of the dustproof ring 32, and the inner wall of the annular notch fits against the outer surface of the retaining ring 321. The annular protrusion 322 is located at the upper end of the inner wall of the dustproof ring groove 31. The annular groove 323 is formed at the upper end of the outer surface of the dustproof ring 32, and the inner wall of the annular groove 323 engages with the outer surface of the annular protrusion 322. The chamfer 324 is located in the middle of the outer surface of the dustproof ring 32, and the chamfer 324 is fitted with the upper end of the annular protrusion 322. When installing the dustproof ring 32, the chamfer 324 can provide a certain degree of clearance for the annular protrusion 322, thus protecting the middle of the dustproof ring 32 and... The lower end provides a limiting effect. The dustproof ring 32 also includes an annular cavity 325, which is located at the lower edge of the inner part of the dustproof ring 32. The annular cavity 325 is installed in conjunction with the retaining ring 321 and the annular protrusion 322. When the piston rod moves upward and the dustproof ring 32 deforms, it is limited by the annular protrusion 322. The lower part of the dustproof ring 32 at the annular protrusion 322 will be squeezed by the annular protrusion 322, and the dustproof ring 32 at the annular cavity 325 will deform, making the lower end of the dustproof ring 32 fit more tightly with the inner wall of the dustproof ring groove 31 and the retaining ring 321. The elastic deformation of the annular cavity 325 can make the dustproof ring 32 fit more tightly with the dustproof ring groove 31. The dustproof ring 32 also includes an annular groove 326 and an annular lip 327. 26 is located at the upper middle of the guide sleeve 1, and an annular lip 327 is located at the lower edge of the dustproof ring 32. The outer surface of the annular lip 327 engages with the inner wall of the annular groove 326, further enhancing the limiting effect of the upper end of the dustproof ring 32. The dustproof mechanism 3 also includes a groove 36 and a hole 37. The groove 36 is evenly distributed at the upper edge of the guide sleeve 1, and the hole 37 is located at the four corners of the outer surface of the guide sleeve 1, facilitating the assembly and disassembly of the guide sleeve 1. With the dustproof mechanism 3, through the limiting effect of the retaining ring 321 and the annular protrusion 322, the deformation of the annular cavity 325, and the blocking effect of the baffle 33, a comprehensive limiting effect can be formed on the dustproof ring 32, preventing the dustproof ring 32 from loosening and falling off due to frequent movement of the piston rod.It also provides positioning and limiting effects for the guide sleeve 1, preventing it from being improperly fixed or loosening.

[0025] The working principle of the guide sleeve structure for hydraulic cylinders provided by this utility model is as follows: When using the guide sleeve for hydraulic cylinders, the sealing components are installed first. First, the support ring 5 is installed by squeezing it by hand until the gaps on the support ring 5 disappear and the ends of the support ring 5 fit tightly together. At this time, the diameter of the support ring 5 becomes smaller. The support ring 5 is then tilted and placed into the support ring groove 4 to complete the installation of the support ring 5. Next, the sealing ring 7 is installed. The sealing ring 7 is a Tess seal, consisting of a rubber O-ring and a polytetrafluoroethylene (PTFE) ring bonded together. First, the rubber O-ring is installed by hand, shaping it into a kidney shape, and then placed into the sealing ring groove 6. The rubber O-ring is smoothed to ensure it fits snugly into the sealing ring groove 6. Then, the PTFE ring is shaped into a kidney shape and placed into the sealing ring groove 6. Smooth the inside of groove 6 to ensure the PTFE ring fits snugly against the rubber O-ring and sealing ring groove 6, completing the installation of sealing ring 7. Next, install sealing ring 8 and sealing gasket 9. Place sealing ring 8 at an angle on the surface of guide sleeve 1, ensuring a portion of sealing ring 8 is inside the corresponding installation groove one. Use a screwdriver to hold sealing ring 8 in place and rotate it one full turn along guide sleeve 1. Sealing ring 8 will move into the installation groove as the screwdriver moves. Then, insert sealing gasket 9 into installation groove two, completing the installation of sealing ring 8 and sealing gasket 9. Next, install dustproof ring 32. Insert the entire dustproof ring 32 into dustproof ring groove 31. During this process, manually adjust the position of the lower end of dustproof ring 32 so that its lower end is inside dustproof ring groove 31 and retaining ring 321. When the upper middle part of the dustproof ring 32 is pressed down, due to the presence of the chamfer 324, the chamfer 324 part of the dustproof ring 32 will deform outward, allowing the annular protrusion 322 to easily fit into the annular groove 323. Then, the annular lip 327 is fitted into the annular groove 326, forming a preliminary limit for the dustproof ring 32. At this point, all the seals are installed. Pick up the guide sleeve 1, pass the piston rod through the inside of the guide sleeve 1, and then insert it into the cylinder. Because the outer surface of the guide sleeve 1 has an external thread 2, the guide sleeve 1 can be screwed into the cylinder. When the guide sleeve 1 is rotated directly, the outside of the guide sleeve 1 is smooth and the torque is small. An external rod-shaped object can be used to insert it into the groove 36 and the insertion hole 37 to increase the torque and facilitate the installation of the guide sleeve 1. Install the guide sleeve 1 until it is rotated into place, aligning the internal threaded hole 34 on the guide sleeve 1 with the mounting hole at the upper end of the cylinder body. The sealing ring 8 is tightly fitted against the inner wall of the cylinder body, and the sealing gasket 9 is also tightly fitted against the upper end of the cylinder body. Place the baffle 33 at a suitable position on the upper end of the guide sleeve 1. Screw the fixing bolt 35 through the through hole on the baffle 33 into the internal threaded hole 34 until the lower end of the baffle 33 is fitted against the upper end of the dustproof ring 32, thus limiting the dustproof ring 32 again. At this time, the top wall of the fixing bolt 35 is fitted against the upper end of the baffle 33, and the lower end of the outer surface of the fixing bolt 35 is connected to the internal thread of the mounting hole at the upper end of the cylinder body. At this time, the guide sleeve 1 itself is threadedly connected to the cylinder body through the external thread 2, and also forms a positioning and limiting effect above the cylinder body through the fixing bolt 35.This avoids situations where the guide sleeve 1 is not properly fixed or loose, allowing the hydraulic cylinder to operate. During the upward movement of the piston rod, the retaining ring 321 prevents the lowest edge of the dustproof ring 32 from contacting the piston rod surface, thus preventing the dustproof ring 32 from being pulled upwards by the piston rod. Because of the contact between the piston rod and the inside of the dustproof ring 32, friction will cause the dustproof ring 32 to deform slightly upwards when the piston rod moves upwards. The annular protrusion 322 and the annular groove 323 have a locking relationship, which limits the dustproof ring 32, preventing it from loosening and falling off as a whole. At the same time, when the dustproof ring 32 deforms slightly upwards, it is limited by the annular protrusion 322. The dustproof ring 32 below the annular protrusion 322 deforms under stress, causing the annular cavity 325 to deform as well. This ensures a tighter fit between the dustproof ring 32 and the dustproof ring groove 31, guaranteeing a proper seal. When the piston rod moves downwards, its outer surface contacts the upper edge of the dustproof ring 32, where the annular groove 326 and the annular lip 327 engage. The baffle 33 also provides a limiting effect on the dustproof ring 32, preventing it from lifting or loosening at the edge when the piston rod moves downwards. This comprehensive limiting effect prevents the dustproof ring 32 from loosening or falling off due to frequent piston rod movement.

[0026] 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 content of this utility model specification and drawings, 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 guide sleeve structure for a hydraulic cylinder, characterized in that: Includes a sleeve (1) and a dustproof mechanism (3); Guide sleeve (1): Its outer surface has uniformly distributed external threads (2) in the middle; Dustproof mechanism (3): It includes a dustproof ring groove (31), a dustproof ring (32), a baffle (33), an internal threaded hole (34), and a fixing bolt (35). The dustproof ring groove (31) is opened on the upper end of the inner wall of the guide sleeve (1). The dustproof ring (32) is set inside the dustproof ring groove (31). The baffle (33) is set on the upper end of the guide sleeve (1). The lower end of the baffle (33) is in contact with the upper edge of the dustproof ring (32). The internal threaded hole (34) is evenly opened at the four corners of the upper end of the guide sleeve (1). The fixing bolt (35) is threaded into the interior of the internal threaded hole (34). The four corners of the baffle (33) are provided with through holes. The upper end of the outer surface of the fixing bolt (35) penetrates the inner wall of the through hole. The top wall of the fixing bolt (35) is in contact with the upper end of the baffle (33).

2. The guide sleeve structure for a hydraulic cylinder according to claim 1, characterized in that: The dustproof ring (32) includes a retaining ring (321), an annular protrusion (322), an annular groove (323), and a chamfer (324). The retaining ring (321) is located at the upper end of the bottom wall of the dustproof ring groove (31). An annular notch is provided at the lower end of the inner wall of the dustproof ring (32). The inner wall of the annular notch fits against the outer surface of the retaining ring (321). The annular protrusion (322) is located at the upper end of the inner wall of the dustproof ring groove (31). The annular groove (323) is located at the upper end of the outer surface of the dustproof ring (32). The inner wall of the annular groove (323) is engaged with the outer surface of the annular protrusion (322). The chamfer (324) is located in the middle of the outer surface of the dustproof ring (32). The chamfer (324) is fitted with the upper end of the annular protrusion (322).

3. The guide sleeve structure for a hydraulic cylinder according to claim 2, characterized in that: The dustproof ring (32) also includes an annular cavity (325), which is located at the lower edge of the interior of the dustproof ring (32). The annular cavity (325) is installed in conjunction with the retaining ring (321) and the annular protrusion (322).

4. The guide sleeve structure for a hydraulic cylinder according to claim 1, characterized in that: The dustproof ring (32) also includes an annular groove (326) and an annular lip (327). The annular groove (326) is located at the upper middle part of the guide sleeve (1), and the annular lip (327) is located at the lower edge of the dustproof ring (32). The outer surface of the annular lip (327) is engaged with the inner wall of the annular groove (326).

5. The guide sleeve structure for a hydraulic cylinder according to claim 1, characterized in that: The dustproof mechanism (3) also includes grooves (36) and holes (37). The grooves (36) are evenly opened at the upper edge of the guide sleeve (1), and the holes (37) are all opened at the four corners of the outer surface of the guide sleeve (1).

6. The guide sleeve structure for a hydraulic cylinder according to claim 1, characterized in that: It also includes a support ring groove (4), a support ring (5), a sealing ring groove (6) and a sealing ring (7). The support ring groove (4) is respectively opened at the upper and lower ends of the inner wall of the guide sleeve (1). The support ring (5) is set inside the support ring groove (4). The sealing ring groove (6) is opened in the middle of the inner wall of the guide sleeve (1). The sealing ring (7) is set inside the sealing ring groove (6).

7. The guide sleeve structure for a hydraulic cylinder according to claim 1, characterized in that: It also includes a sealing ring (8) and a sealing gasket (9). The sealing ring (8) is located at the lower end of the outer surface of the guide sleeve (1), and the sealing gasket (9) is located at the lower end of the top wall of the guide sleeve (1).

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