External guide hydraulic cylinder

Abstract

The utility model provides an external guide hydraulic cylinder, and belongs to the technical field of mechanical hydraulic pressure. The external guide hydraulic cylinder is composed of a hydraulic cylinder body, a base, a top seat, a piston rod and four pull rods, and a complete hydraulic cylinder system is formed. The design of the first oil inlet and the second oil inlet ensures smooth circulation of hydraulic oil. And a fixing mechanism, a guiding mechanism and a sleeve limiting mechanism are arranged at the top of the piston rod. The fixing mechanism fixes the guiding mechanism on the piston rod through the external thread, the blocking ring and the locking nut. The guide mechanism comprises a cross and four guide rods which are connected with the fixing disc and the sleeve rod of the sleeve limiting mechanism in an inserted mode to jointly limit and guide the motion range of the piston rod. According to the design, the piston rod is effectively prevented from deviating or shaking under the action of high pressure, so that the overall performance and precision of the hydraulic cylinder are improved, the reliability is enhanced, and the service life is prolonged.

Description

Technical Field

[0001] The present application relates to the field of mechanical hydraulic technology, and in particular to an externally guided hydraulic cylinder. Background Art

[0002] As a highly efficient energy conversion device, the core function of a hydraulic cylinder is to precisely convert the pressure energy of oil into mechanical energy, thereby driving various working mechanisms to achieve linear reciprocating motion or reciprocating oscillation. As a key actuator in hydraulic systems, hydraulic cylinders come in a wide variety of types, categorized by their structural characteristics: piston, plunger, swing, and telescopic. Among these, piston hydraulic cylinders are the most common choice due to their wide range of applications and outstanding performance.

[0003] Currently, piston-type hydraulic cylinders feature sophisticated designs, with their internal structure primarily consisting of core components such as the cylinder barrel, piston, piston rod, and seals. During operation, high-pressure oil enters one end of the cylinder barrel through a specific oil passage, pushing the piston and its connected piston rod along the cylinder barrel's axis. This process not only utilizes the oil's pressure to overcome external loads but also controls the piston rod's speed by regulating the oil flow, enabling precise control of mechanical movement. However, in practical applications, piston-type hydraulic cylinders face a common and challenging problem: piston rod deflection. When subjected to pressure and moving, the piston rod often struggles to maintain an ideal straight trajectory, resulting in positional deviation. The causes of this phenomenon are complex and diverse, including but not limited to uneven oil pressure distribution, defects in the piston rod material or manufacturing, and non-uniform external loads. Piston rod deflection not only directly impairs the hydraulic cylinder's transmission efficiency and precision but can also trigger a series of chain reactions, such as increased friction and wear between the rod head and the inner wall of the cylinder barrel, shortening the cylinder's service life, and even leading to serious consequences such as seal failure and oil leakage, posing a threat to the overall performance and safety of the hydraulic system. Utility Model Content

[0004] In order to make up for the above deficiencies, the present application provides an external guide hydraulic cylinder to solve the problems raised in the above background technology.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention to solve the technical problem is as follows:

[0006] An externally guided hydraulic cylinder comprises a hydraulic cylinder body and a base integrally formed at the bottom end of the hydraulic cylinder body and a top seat integrally formed at the top end; a piston rod is provided inside the hydraulic cylinder body; four pull rods are fixedly connected to the four corners of the opposite ends of the base and the top seat; a fixing mechanism is provided on the outer wall of the top of the piston rod; a guiding mechanism is provided between the fixing mechanism and the piston rod; a sleeve limiting mechanism is integrally formed on the outer walls of the four pull rods; the bottom end of the guiding mechanism is plugged into the interior of the sleeve limiting mechanism.

[0007] Furthermore, the fixing mechanism includes an external thread, a blocking ring and a locking nut. The external thread is provided on the outer wall of the piston rod. The inner ring of the blocking ring is integrally formed with the outer wall of the piston rod, and the surface is in contact with the top of the guide mechanism. The inner ring of the locking nut is threadedly connected to the external thread, and the bottom is tightly clamped to the surface of the guide mechanism.

[0008] Furthermore, the guiding mechanism includes a cross, a through hole and four guide rods. The through hole is opened on the surface of the cross, and the upper and lower surfaces are respectively clamped and connected with the opposite ends of the blocking ring and the locking nut. The inner wall of the through hole is fitted with the outer wall of the piston rod. The top ends of the four guide rods are seamlessly welded to the four corners of the bottom of the cross, and the bottom ends are plugged into the inside of the sleeve limit mechanism.

[0009] Furthermore, the sleeve limiting mechanism includes a fixed plate, four through holes, four connecting holes and four sleeve rods. The inner ring of the fixed plate is fitted with the outer wall of the hydraulic cylinder body, and the surface is provided with four through holes and four connecting holes at equal intervals. The inner walls of the four through holes are respectively integrally formed with the outer walls of the four pull rods. The top ends of the four sleeve rods are respectively integrally formed with the bottom of the fixed plate at equal intervals, and the interiors are respectively connected to the interiors of the four connecting holes. The bottom ends of the four guide rods are respectively plugged into the interiors of the four sleeve rods through the interiors of the four connecting holes.

[0010] Furthermore, a first oil inlet is provided on the side wall of the base, and the interior of the first oil inlet is communicated with the inner bottom of the hydraulic cylinder body.

[0011] Furthermore, a second oil inlet is provided on the side wall of the top seat, the interior of the second oil inlet is communicated with the top of the hydraulic cylinder body, the surface of the top seat has a circular hole, and the inner wall of the circular hole is sealed with the outer wall of the piston rod.

[0012] Furthermore, the bottom of the piston rod is provided with a piston, and is sealed and fitted with the inner bottom side wall of the hydraulic cylinder body.

[0013] The utility model has the following beneficial effects:

[0014] 1. Through the combined design of a fixing mechanism, a guide mechanism, and a sleeve limiting mechanism, this utility model effectively reduces piston rod deflection caused by uneven pressure distribution or changes in external load when subjected to oil pressure. The external threads, blocking ring, and locking nut in the fixing mechanism act together on the piston rod, ensuring a secure connection between the guide mechanism cross and the piston rod. At the same time, the four guide rods at the base of the cross seamlessly connect with the four precisely corresponding sleeve rods in the sleeve limiting mechanism. This design further strictly limits the radial movement of the piston rod, ensuring precise and stable linear motion along the axis of the cylinder.

[0015] 2. The guide rod in the guide mechanism of the utility model and the sleeve rod in the sleeve limit mechanism form a precise plug-in fit, which not only enhances the overall rigidity and stability of the hydraulic cylinder, but also effectively reduces the direct friction between the piston at the bottom of the piston rod and the hydraulic cylinder body, thereby extending the service life of the hydraulic cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the implementation methods of the present application, the following is a brief introduction to the drawings required for use in the implementation methods. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a schematic diagram of the structure of an external guide hydraulic cylinder provided in an embodiment of the present application;

[0018] Figure 2 A schematic diagram of the connection structure of the guide mechanism and the sleeve limiting mechanism provided in an embodiment of the present application;

[0019] Figure 3 A schematic diagram of the marking structure of the sleeve limit mechanism provided in the embodiment of this application;

[0020] Figure 4 A schematic diagram of the guide mechanism marking structure provided in the embodiment of this application;

[0021] Figure 5 A schematic diagram of the hydraulic cylinder structure provided in an embodiment of the present application;

[0022] Figure 6 Provided for the implementation of this application Figure 5 Enlarged structural diagram at point A in the middle.

[0023] In the figure: 1- hydraulic cylinder body; 2- base; 3- top seat; 4- piston rod; 5- pull rod; 6- fixing mechanism; 7- guiding mechanism; 8- sleeve limiting mechanism; 61- external thread; 62- blocking ring; 63- locking nut; 71- cross; 72- through hole; 73- guide rod; 81- fixing plate; 82- through hole; 83- plug hole; 84- sleeve rod; 21- first oil inlet; 31- second oil inlet. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0025] Example:

[0026] See also Figure 1 、 Figure 5 、 Figure 6 An externally guided hydraulic cylinder comprises a hydraulic cylinder body 1, a base 2 integrally formed at the bottom end of the hydraulic cylinder body 1, and a top seat 3 integrally formed at the top end. A piston rod 4 is provided inside the hydraulic cylinder body 1, and four pull rods 5 are fixedly connected to the four corners of the opposite ends of the base 2 and the top seat 3; a first oil inlet 21 is provided on the side wall of the base 2; a second oil inlet 31 is provided on the side wall of the top seat 3.

[0027] The hydraulic cylinder body 1, base 2, top seat 3, piston rod 4, and four tie rods 5 are designed to form a complete hydraulic cylinder system. Furthermore, a first oil inlet 21 on the side wall of the base 2 and a second oil inlet 31 on the side wall of the top seat 3 work together to form the hydraulic cylinder's hydraulic oil inlet and outlet system, ensuring smooth flow of hydraulic oil. When hydraulic oil is injected into the hydraulic cylinder body 1 through the first oil inlet 21, thanks to the precise sealing effect of the piston at the bottom of the piston rod 4, the hydraulic oil generates a strong thrust, propelling the piston rod 4 in a stable upward linear motion along the axis of the hydraulic cylinder body 1. When hydraulic oil is injected into the hydraulic cylinder body 1 through the second oil inlet 31, the hydraulic oil originally injected through the first oil inlet 21 is forced back out of the first oil inlet 21 under pressure. Simultaneously, the newly injected hydraulic oil generates thrust, propelling the piston rod 4 in a stable downward linear motion along the axis of the hydraulic cylinder body 1.

[0028] Among them, the hydraulic cylinder body 1 is the main part of the entire hydraulic cylinder. The hydraulic cylinder body 1 is a sealed cylindrical container for containing hydraulic oil and the piston rod 4. The base 2 is integrally formed with the bottom end of the hydraulic cylinder body 1 to provide stable support for the hydraulic cylinder. A first oil inlet 21 is provided on the side wall of the base 2. The first oil inlet 21 is connected to the bottom of the hydraulic cylinder body 1 and is used to inject hydraulic oil into the hydraulic cylinder body 1. The top seat 3 is integrally formed with the top of the hydraulic cylinder body 1 to seal the top of the hydraulic cylinder body 1. A second oil inlet 31 is provided on the side wall of the top seat 3. The second oil inlet 31 is connected to the top of the hydraulic cylinder body 1 and is also used to inject hydraulic oil into the hydraulic cylinder body 1. The surface of the top seat 3 also has a circular hole. The inner wall of the circular hole is sealed and fits tightly with the outer wall of the piston rod 4. The inner wall of the circular hole is sealed and provided with a dust ring to prevent hydraulic oil leakage. The piston rod 4 is located inside the hydraulic cylinder body 1. Its bottom has a piston and is sealed and fits tightly with the inner bottom side wall of the hydraulic cylinder body 1. The piston rod 4 can do reciprocating motion in the hydraulic cylinder body 1 under the push of hydraulic oil. Four pull rods 5 are fixedly connected to the four corners of the opposite ends of the base 2 and the top seat 3 respectively, for enhancing the structural strength of the hydraulic cylinder body 1.

[0029] See also Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 , an externally guided hydraulic cylinder, a fixing mechanism 6 is provided on the outer wall of the top of the piston rod 4, a guiding mechanism 7 is provided between the fixing mechanism 6 and the piston rod 4, the outer walls of the four pull rods 5 are integrally formed with a sleeve limiting mechanism 8, and the bottom end of the guiding mechanism 7 is plugged into the inside of the sleeve limiting mechanism 8; the fixing mechanism 6 includes an external thread 61, a blocking ring 62 and a locking nut 63; the guiding mechanism 7 includes a cross 71, a through hole 72 and four guide rods 73; the sleeve limiting mechanism 8 includes a fixing plate 81, four through holes 82, four plug-in holes 83 and four sleeve rods 84.

[0030] Among them, the fixing mechanism 6 is used to fix the guiding mechanism 7 to the outer top of the piston rod 4. The external thread 61 is directly opened on the outer wall of the piston rod 4, and its specifications and pitch are precisely calculated to ensure a tight fit with the locking nut 63. The inner ring of the blocking ring 62 is integrally formed with the outer wall of the piston rod 4 to form an inseparable whole. The surface of the blocking ring 62 is designed with a contact surface that fits with the bottom of the cross 71 to ensure that the guiding mechanism 7 can be stably fixed on the piston rod 4. The inner ring of the locking nut 63 is processed with a thread that matches the external thread 61. By rotating the locking nut 63, it can be moved along the external thread 61 of the piston rod 4 until it is tightly clamped with the surface of the cross 71. This design not only ensures the stability of the cross 71, but also facilitates disassembly and maintenance when necessary. During the assembly process, the cross 71 in the guiding mechanism 7 is first placed at a predetermined position on the piston rod 4 so that its bottom fits with the surface of the blocking ring 62. Then, the locking nut 63 is rotated onto the external thread 61 of the piston rod 4 and gradually tightened until the bottom of the locking nut 63 forms a tight clamp with the surface of the cross 71. This connection method is not only simple and reliable, but also effectively prevents the fixing mechanism 6 from loosening or falling off during the operation of the hydraulic cylinder.

[0031] Among them, the combined design of the guiding mechanism 7 and the sleeve limiting mechanism 8 can guide the piston rod 4 to make linear motion. The cross 71 serves as the main part of the guiding mechanism 7, and its upper and lower surfaces are respectively clamped and connected to the opposite ends of the blocking ring 62 and the locking nut 63 to form a stable supporting structure. A through hole 72 is provided in the center of the surface of the cross 71, and the inner wall of the through hole 72 fits tightly with the outer wall of the piston rod 4 to ensure the stability of the connection between the piston rod 4 and the cross 71. The four guide rods 73 are seamlessly welded to the four corners of the bottom of the cross 71, and their lengths and diameters are precisely calculated to ensure that they can be perfectly plugged into the sleeve rods 84 in the sleeve limiting mechanism 8. The main function of the guide rods 73 is to further limit the range of motion of the piston rod 4 to prevent it from deflecting or shaking in the hydraulic cylinder body 1. The fixed plate 81 serves as the main part of the sleeve limiting mechanism 8, and its inner ring fits tightly with the outer wall of the hydraulic cylinder body 1 to form a stable supporting surface. The surface of the fixed plate 81 is provided with four through holes 82 and four plug holes 83 at equal intervals, providing passages for the pull rod 5 and the guide rod 73 to pass through. The design of the through hole 82 enables the pull rod 5 to pass through the fixed plate 81 and form a stable connection with the hydraulic cylinder body 1 and the base 2 / top seat 3. At the same time, the inner ring of the through hole 82 is welded to the outer wall of the pull rod 5 to ensure the stability of the fixed plate 81. The design of the plug hole 83 provides a plug-in channel for the guide rod 73, so that the guide mechanism 7 can be tightly combined with the sleeve limit mechanism 8 to jointly limit and guide the range of motion of the piston rod 4. The four sleeve rods 84 are respectively and equidistantly integrally formed at the bottom of the fixed plate 81, and their interiors are interconnected with the interiors of the four plug holes 83. The main function of the sleeve rod 84 is to receive and fix the bottom end of the guide rod 73 to ensure that the connection between the guide mechanism 7 and the sleeve limit mechanism 8 is stable and reliable. Through this combination, the guide mechanism 7 and the sleeve limit mechanism 8 together form a stable support and guide system, which not only ensures the linear movement of the piston rod 4 in the hydraulic cylinder body, but also improves the overall stability and service life of the hydraulic cylinder.

[0032] The operating principle of this externally guided hydraulic cylinder is as follows: During use, hydraulic oil is first injected into the interior of the hydraulic cylinder body 1 through the first oil inlet 21 provided on the side wall of the base 2. Precision sealing technology is employed between the piston and the inner wall of the hydraulic cylinder body 1, preventing hydraulic oil from leaking through these tiny gaps. Consequently, as hydraulic oil continues to be injected, a strong pressure gradually builds up inside the hydraulic cylinder body 1, pushing the piston and the piston rod 4 above it in a stable upward linear motion along the axis of the hydraulic cylinder body 1. Simultaneously, the four guide rods 73, precisely constrained by four insertion holes 83 and four sleeve rods 84, rise synchronously with the upward movement of the piston rod 4. These guide rods 73 are tightly connected to the piston rod 4 via a cross 71, providing additional support for the piston rod 4 while ensuring its straightness and stability during movement. This design effectively prevents the piston rod 4 from deflecting or shaking under high pressure, thereby improving the overall performance and precision of the hydraulic cylinder. When downward movement of the piston rod 4 is required, hydraulic oil is injected into the hydraulic cylinder body 1 through the second oil inlet 31 on the side wall of the top base 3. At this time, the hydraulic oil originally injected through the first oil inlet 21 will flow back into the hydraulic system through the first oil inlet 21 under the pressure of the newly injected hydraulic oil. At the same time, the newly injected hydraulic oil continues to play a role, pushing the piston and the piston rod 4 to perform a stable downward linear motion along the axis of the hydraulic cylinder body 1. In this process, the four guide rods 73 are also restricted by the four plug holes 83 and the four sleeve rods 84, and they descend synchronously with the descent of the piston rod 4. They maintain a tight connection with the piston rod 4 through the cross 71, and continue to provide stable support and guidance for the piston rod 4. This synergistic effect of up and down movement not only ensures the precise movement of the piston rod 4 in the hydraulic cylinder body, but also greatly improves the reliability and service life of the hydraulic cylinder.

[0033] It should be noted that the specific models and specifications of the piston rod 4 and the fixed plate 81 need to be selected and determined according to the actual specifications of the device. The specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0034] It will be apparent to those skilled in the art that the present application is not limited to the details of the exemplary embodiments described above, and that the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present application is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. An externally guided hydraulic cylinder, comprising a hydraulic cylinder body (1), a base (2) integrally formed at the bottom end of the hydraulic cylinder body (1), and a top seat (3) integrally formed at the top end, wherein a piston rod (4) is provided inside the hydraulic cylinder body (1), and four pull rods (5) are fixedly connected to four corners of the opposite ends of the base (2) and the top seat (3), respectively, and characterized in that: A fixing mechanism (6) is provided on the top outer wall of the piston rod (4), a guiding mechanism (7) is provided between the fixing mechanism (6) and the piston rod (4), and a sleeve limiting mechanism (8) is integrally formed on the outer walls of the four pull rods (5), and the bottom end of the guiding mechanism (7) is plugged into the interior of the sleeve limiting mechanism (8).

2. The externally guided hydraulic cylinder according to claim 1, characterized in that: The fixing mechanism (6) includes an external thread (61), a blocking ring (62) and a locking nut (63); the external thread (61) is provided on the outer wall of the piston rod (4); the inner ring of the blocking ring (62) is integrally formed with the outer wall of the piston rod (4), and the surface is in contact with the inner top of the guide mechanism (7); the inner ring of the locking nut (63) is threadedly connected to the external thread (61), and the bottom is tightly clamped to the surface of the guide mechanism (7).

3. The externally guided hydraulic cylinder according to claim 2, characterized in that: The guiding mechanism (7) comprises a cross (71), a through hole (72) and four guide rods (73). The through hole (72) is provided on the surface of the cross (71), and the upper and lower surfaces are respectively clamped and connected with the opposite ends of the blocking ring (62) and the locking nut (63). The inner wall of the through hole (72) is fitted with the outer wall of the piston rod (4). The top ends of the four guide rods (73) are seamlessly welded to the four corners of the bottom of the cross (71), and the bottom ends are plugged into the interior of the sleeve limit mechanism (8).

4. The externally guided hydraulic cylinder according to claim 3, characterized in that: The sleeve limiting mechanism (8) includes a fixed plate (81), four through holes (82), four plug holes (83) and four sleeve rods (84). The inner ring of the fixed plate (81) is in contact with the outer wall of the hydraulic cylinder body (1), and the surface is provided with four through holes (82) and four plug holes (83) at equal intervals. The inner walls of the four through holes (82) are integrally formed with the outer walls of the four pull rods (5). The top ends of the four sleeve rods (84) are integrally formed with the bottom of the fixed plate (81) at equal intervals, and the interiors are connected to the interiors of the four plug holes (83). The bottom ends of the four guide rods (73) are respectively plugged into the interiors of the four sleeve rods (84) through the interiors of the four plug holes (83).

5. The externally guided hydraulic cylinder according to claim 4, characterized in that: A first oil inlet (21) is provided on the side wall of the base (2), and the interior of the first oil inlet (21) is communicated with the bottom of the hydraulic cylinder body (1).

6. The externally guided hydraulic cylinder according to claim 5, characterized in that: A second oil inlet (31) is provided on the side wall of the top seat (3), and the interior of the second oil inlet (31) is communicated with the top of the hydraulic cylinder body (1). The surface of the top seat (3) has a circular hole, and the inner wall of the circular hole is sealed and fitted with the outer wall of the piston rod (4).

7. The externally guided hydraulic cylinder according to claim 6, characterized in that: The bottom of the piston rod (4) is provided with a piston, and is in sealing contact with the inner bottom side wall of the hydraulic cylinder body (1).

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