Oil cylinder with buffering function and elastic buffering mechanism for oil cylinder
By setting an elastic buffer mechanism on the piston rod of the hydraulic cylinder, the problem of buffer mechanism deformation is solved, achieving stable operation and efficient flow of the hydraulic cylinder, and improving the working performance and service life of the hydraulic cylinder.
Patent Information
- Application Number
- CN202520310942.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-26
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2035-02-26
AI Technical Summary
In the prior art, hydraulic cylinders with the buffer mechanism and piston rod integrated are prone to deformation due to prolonged stress, which affects the working performance and lifespan of the hydraulic cylinder.
Design a hydraulic cylinder with an elastic buffer mechanism. By setting an elastic buffer mechanism on the piston rod, the piston rod gradually inserts into the flow channel to throttle when it retracts at the end of its stroke, and retracts under force at the beginning of its extension stroke, thus achieving the switching between buffering and high-pressure flow.
This effectively avoids deformation of the buffer mechanism, ensuring the buffering effect of the hydraulic cylinder during retraction and rapid high-pressure flow during extension, thus improving the working performance and lifespan of the hydraulic cylinder.
Smart Images
Figure CN223578376U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to general hydraulic technology field, concretely relates to the hydraulic actuator of straight cylinder type, and especially relates to an oil cylinder with buffer function and elastic buffer mechanism thereof. BACKGROUND
[0002] The oil cylinder is a hydraulic execution element of mechanical equipment, and its role is crucial, that is, whether the oil cylinder has good working performance, safety performance and life requirement will directly affect various performances and life of the mechanical equipment.
[0003] The buffer mechanism is an important component of the oil cylinder design, and its purpose is to eliminate mechanical impact and vibration between internal structures of the oil cylinder caused by inertial force and hydraulic pressure of moving parts, to ensure stable work of the system, to prevent damage of the transmission parts, and to improve working performance and life of the system.
[0004] In the related art, the buffer mechanism is generally connected with the piston rod in an integral manner, but this connection manner of the buffer mechanism and the piston rod makes the buffer mechanism prone to deformation after being stressed for a long time.
[0005] Therefore, how to solve the technical problem that the integral buffer mechanism is prone to deformation is an urgent problem for those skilled in the art.
[0006] It should be noted that the above information disclosed in the background section is only used to understand the background of the present application, and therefore, the above description is not considered as information of the prior art. CONTENT OF THE UTILITY MODEL
[0007] The present disclosure provides at least an oil cylinder with buffer function and an elastic buffer mechanism thereof.
[0008] In the first aspect, the present disclosure provides an oil cylinder with buffer function, comprising: a cylinder body, a piston cavity is formed in the cylinder body; a piston, which is slidably arranged in the piston cavity; a piston rod, one end of which is adapted to be inserted into the piston cavity and connected with the piston, and the piston cavity is divided into a rod cavity and a rodless cavity; an elastic buffer mechanism, which is inserted on the piston rod and extends into the rodless cavity; wherein the cylinder body is provided with a flow channel, and one end of the flow channel is in communication with the rodless cavity; when the piston rod is at the end of the retraction stroke, the elastic buffer mechanism on the piston rod is inserted into the flow channel to gradually throttle; and when the piston rod is at the beginning of the extension stroke, the oil in the flow channel extrudes the elastic buffer mechanism to make the elastic buffer mechanism retract.
[0009] In an alternative embodiment, the end face of the piston rod towards the rodless cavity is provided with a mounting chamber along the axial direction; the elastic buffering mechanism comprises: a buffering column arranged in the mounting chamber; and an elastic member arranged in the mounting chamber and sleeved on the buffering column, and adapted to push the buffering column so that the outer end of the buffering column extends into the rodless cavity; wherein, at the end of the retraction stroke of the piston rod, the outer end of the buffering column is adapted to be inserted into the flow channel.
[0010] In an alternative embodiment, the flow channel comprises: a buffering hole in communication with the rodless cavity, and the buffering hole is coaxially arranged with the buffering column; wherein, at the end of the retraction stroke of the piston rod, the buffering column is adapted to be inserted into the buffering hole and form a gradually reduced annular gap for throttling.
[0011] In an alternative embodiment, the outer end of the buffering column is provided with at least one bevel; wherein, the bevel extends from the end face to the middle part of the buffering column; at the end of the retraction stroke of the piston rod, the buffering column is adapted to be inserted into the buffering hole and form a gradually reduced annular gap through the bevel.
[0012] In an alternative embodiment, the middle part of the buffering column is provided with an annular boss; the elastic member is sleeved on the inner end of the buffering column, and one end of the elastic member abuts against the mounting chamber and the other end abuts against the annular boss.
[0013] In an alternative embodiment, the inner wall of the mounting chamber is provided with an annular mounting site, and a limiting assembly is arranged in the annular mounting site; wherein, the limiting assembly is located outside the annular boss and adapted to block the buffering column from leaving the mounting chamber; the limiting assembly comprises: a check ring and a check ring.
[0014] In an alternative embodiment, the flow channel further comprises: an extension hole in communication with the buffering hole at one end and extending to the side wall of the cylinder at the other end; wherein, at the end of the retraction stroke of the piston rod, the connection between the extension hole and the buffering hole is located outside the buffering column.
[0015] In a second aspect, the embodiments of the present disclosure further provide an elastic buffering mechanism with buffering function for an oil cylinder, comprising: a buffering column arranged at the axial center of a piston rod; and an elastic member connected with the buffering column and adapted to push the buffering column out of the end face of the piston rod; wherein, at the end of the retraction stroke of the piston rod, the outer end of the buffering column is adapted to be inserted into the buffering hole of the flow channel.
[0016] In an alternative embodiment, the outer end of the buffering column is provided with at least one bevel; wherein, the bevel extends from the end face to the middle part of the buffering column; at the end of the retraction stroke of the piston rod, the buffering column is adapted to be inserted into the buffering hole and form a gradually reduced annular gap through the bevel.
[0017] In an alternative embodiment, the middle part of the buffer column is provided with an annular boss; the elastic member is sleeved on the inner end part of the buffer column and abuts against the annular boss to push the buffer column.
[0018] The oil cylinder with the buffering function has the advantages that the elastic buffering mechanism is gradually inserted into the flow channel at the end of the retraction stroke of the piston rod, thereby generating a buffering effect on the retraction of the oil cylinder through throttling, and the elastic buffering mechanism is retracted under stress at the beginning of the extension stroke of the piston rod, and the rodless cavity oil port is opened, thereby facilitating the introduction of high-pressure hydraulic oil into the rodless cavity and normal operation of the oil cylinder.
[0019] Other features and advantages of the present application will be set forth in the following description of the application, and in part will become apparent to those skilled in the art upon examination of the following or can be learned by practice of the application. The objects and other advantages of the application can be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
[0020] In order to make the above objectives, features and advantages of the present application more obvious and easy to understand, the preferred embodiments are described in detail below, and the detailed description is made below with the help of the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS
[0021] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.
[0022] Figure 1 A structure schematic view of the oil cylinder with the buffering function provided by the embodiment of the present application at the end of the retraction stroke is shown in the figure;
[0023] Figure 2 A structure schematic view of the oil cylinder with the buffering function provided by the embodiment of the present application at the beginning of the extension stroke is shown in the figure;
[0024] Figure 3 A structure schematic view of the elastic buffering mechanism provided by the embodiment of the present application is shown in the figure;
[0025] Figure 4 A structure schematic view of the buffer column provided by the embodiment of the present application is shown in the figure;
[0026] Figure 5 A structure schematic view of the annular mounting site and the limiting assembly provided by the embodiment of the present application is shown in the figure.
[0027] In the figure:
[0028] Cylinder block 1, piston chamber 11, rod chamber 111, rodless chamber 112, flow channel 12, buffer hole 121, annular gap 122, extension hole 123;
[0029] Piston 2;
[0030] Piston rod 3, mounting chamber 31, annular mounting position 311, limiting assembly 312, retaining ring 313, retaining ring 314;
[0031] Elastic buffer mechanism 4, buffer column 41, outer end 411, oblique cut 412, annular boss 413, inner end 414, elastic element 42. Detailed Implementation
[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0033] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the figures, the thickness of parts may be exaggerated or reduced for the purpose of effectively depicting the technical content.
[0034] The following detailed description, with reference to the accompanying drawings, describes some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0035] like Figure 1 As shown, at least one embodiment provides a hydraulic cylinder with a buffer function, including: a cylinder body 1, a piston 2, and a piston rod 3. A piston chamber 11 is provided in the cylinder body 1. The piston 2 is slidably disposed in the piston chamber 11. One end of the piston rod 3 is inserted into the piston chamber 11 and connected to the piston 2, thereby dividing the piston chamber 11 into a rod chamber 111 and a rodless chamber 112.
[0036] In this embodiment, the hydraulic system is connected to the piston chamber 11. When the high-pressure oil of the hydraulic system is filled into the rod chamber 111, the piston rod 3 retracts. When the high-pressure oil of the hydraulic system is filled into the rodless chamber 112, the piston rod 3 extends.
[0037] like Figure 1 As shown, in some embodiments, an elastic buffer mechanism 4 is inserted into the piston rod 3, and one end of the elastic buffer mechanism 4 extends into the rodless cavity 112.
[0038] In the embodiment, the cylinder 1 is provided with a flow channel 12, and one end of the flow channel 12 is communicated with the rodless cavity 112. When the piston rod 3 is at the end of the retraction stroke, the end of the elastic buffering mechanism 4 is gradually inserted into the flow channel 12, the flow cross section of the flow channel 12 is gradually reduced to throttle the oil, the hydraulic oil pressure in the rodless cavity is increased, the movement speed of the piston 2 is slowed down, and thus the retraction of the oil cylinder is buffered. Figure 2 As shown in the figure, the end of the elastic buffering mechanism 4 is gradually inserted into the flow channel 12, the flow cross section of the flow channel 12 is gradually reduced to throttle the oil, the hydraulic oil pressure in the rodless cavity is increased, the movement speed of the piston 2 is slowed down, and thus the retraction of the oil cylinder is buffered.
[0039] As shown in the figure, the end of the elastic buffering mechanism 4 is gradually inserted into the flow channel 12, the flow cross section of the flow channel 12 is gradually reduced to throttle the oil, the hydraulic oil pressure in the rodless cavity is increased, the movement speed of the piston 2 is slowed down, and thus the retraction of the oil cylinder is buffered. Figure 1 As shown in the figure, the high-pressure oil delivered by the hydraulic system acts on the elastic buffering mechanism 4 through the flow channel 12, the elastic buffering mechanism 4 is forced to retract, that is, the high-pressure oil passes through the gradually increasing flow cross section to act on the piston 2, and thus the oil cylinder works normally.
[0040] As shown in the figure, the end of the elastic buffering mechanism 4 is gradually inserted into the flow channel 12, the flow cross section of the flow channel 12 is gradually reduced to throttle the oil, the hydraulic oil pressure in the rodless cavity is increased, the movement speed of the piston 2 is slowed down, and thus the retraction of the oil cylinder is buffered. Figure 3 As shown in the figure, the end of the elastic buffering mechanism 4 is gradually inserted into the flow channel 12, the flow cross section of the flow channel 12 is gradually reduced to throttle the oil, the hydraulic oil pressure in the rodless cavity is increased, the movement speed of the piston 2 is slowed down, and thus the retraction of the oil cylinder is buffered.
[0041] As shown in the figure, the end of the elastic buffering mechanism 4 is gradually inserted into the flow channel 12, the flow cross section of the flow channel 12 is gradually reduced to throttle the oil, the hydraulic oil pressure in the rodless cavity is increased, the movement speed of the piston 2 is slowed down, and thus the retraction of the oil cylinder is buffered. Figure 3 As shown in the figure, the end of the elastic buffering mechanism 4 is gradually inserted into the flow channel 12, the flow cross section of the flow channel 12 is gradually reduced to throttle the oil, the hydraulic oil pressure in the rodless cavity is increased, the movement speed of the piston 2 is slowed down, and thus the retraction of the oil cylinder is buffered.
[0042] In the embodiment, at the end of the retraction stroke of the piston rod 3, the outer end 411 of the buffering column 41 is gradually inserted into the flow channel 12, so as to gradually reduce the flow cross section of the oil.
[0043] As shown in the figure, the end of the elastic buffering mechanism 4 is gradually inserted into the flow channel 12, the flow cross section of the flow channel 12 is gradually reduced to throttle the oil, the hydraulic oil pressure in the rodless cavity is increased, the movement speed of the piston 2 is slowed down, and thus the retraction of the oil cylinder is buffered. Figure 1 As shown in the figure, the end of the elastic buffering mechanism 4 is gradually inserted into the flow channel 12, the flow cross section of the flow channel 12 is gradually reduced to throttle the oil, the hydraulic oil pressure in the rodless cavity is increased, the movement speed of the piston 2 is slowed down, and thus the retraction of the oil cylinder is buffered.
[0044] As shown in the figure, the end of the elastic buffering mechanism 4 is gradually inserted into the flow channel 12, the flow cross section of the flow channel 12 is gradually reduced to throttle the oil, the hydraulic oil pressure in the rodless cavity is increased, the movement speed of the piston 2 is slowed down, and thus the retraction of the oil cylinder is buffered. Figure 2 As shown in the figure, the end of the elastic buffering mechanism 4 is gradually inserted into the flow channel 12, the flow cross section of the flow channel 12 is gradually reduced to throttle the oil, the hydraulic oil pressure in the rodless cavity is increased, the movement speed of the piston 2 is slowed down, and thus the retraction of the oil cylinder is buffered.
[0045] In the embodiment, at the end of the retraction stroke of the piston rod 3, the outer end 411 of the buffering column 41 is gradually inserted into the flow channel 12, so as to gradually reduce the flow cross section of the oil.
[0046] As shown in the figure, the end of the elastic buffering mechanism 4 is gradually inserted into the flow channel 12, the flow cross section of the flow channel 12 is gradually reduced to throttle the oil, the hydraulic oil pressure in the rodless cavity is increased, the movement speed of the piston 2 is slowed down, and thus the retraction of the oil cylinder is buffered.
[0047] like Figure 4 As shown, in some embodiments, the outer end 411 of the buffer post 41 is provided with at least one oblique cut 412; wherein the oblique cut 412 extends along the end face of the buffer post 41 to the center.
[0048] In this embodiment, when the piston rod 3 retracts to the end of its stroke, the buffer post 41 is inserted into the buffer hole 121 and forms a gradually decreasing annular gap 122 through the oblique cut 412.
[0049] Specifically, due to the presence of the oblique cut 412, as the outer end 411 of the buffer post 41 is gradually inserted into the buffer hole 121, the annular gap 122 can be gradually reduced. Compared with the integrated buffer mechanism, it will not generate high pressure due to the instantaneous reduction of the flow cross section.
[0050] Furthermore, due to the presence of the oblique cut 412, at the initial stage of the piston rod 3's extension stroke, the high-pressure oil pushes the buffer column 41 backward while passing through the annular gap 122. During the backward movement of the buffer column 41, the annular gap 122 gradually increases, thereby facilitating the oil to pass through the annular gap 122, quickly opening the rodless chamber oil port, and introducing high-pressure hydraulic oil to enable the cylinder to work normally.
[0051] In some embodiments, when multiple oblique cuts 412 are provided, the oblique cuts 412 are evenly distributed.
[0052] like Figure 3 As shown, in some embodiments, an annular boss 413 is provided in the middle of the buffer post 41.
[0053] In this embodiment, the elastic element 42 may be, but is not limited to, a spring; the elastic element 42 is disposed in the mounting chamber 31 and sleeved on the inner end 414 of the buffer column 41, and one end of the elastic element 42 abuts against the inner wall of the mounting chamber 31, and the other end abuts against the annular boss 413, thereby pushing the outer end 411 of the buffer column 41 into the rodless cavity 112.
[0054] like Figure 5 As shown, in some embodiments, an annular mounting position 311 is provided on the inner wall of the mounting chamber 31, and a limiting component 312 is provided in the annular mounting position 311; wherein, the limiting component 312 is located on the outside of the annular boss 413, and its function is to prevent the buffer column 41 from dislodging from the mounting chamber 3.
[0055] In some embodiments, the limiting component 312 includes a retaining ring 313 and a retaining ring 314.
[0056] like Figure 2As shown, in some embodiments, the flow channel 12 further includes an extension hole 123, one end of which communicates with the buffer hole 121, and the other end extends to the side wall of the cylinder 1; wherein, at the end of the piston rod 3 retraction stroke, the connection between the extension hole 123 and the buffer hole 121 is located outside the buffer post 41.
[0057] like Figure 2 As shown, at least one embodiment also provides an elastic buffer mechanism for a hydraulic cylinder with a buffer function, including: a buffer post 41, inserted at the axis of the piston rod 3; an elastic member 42, connected to the buffer post 41, adapted to push the buffer post 41 out of the end face of the piston rod 3; wherein, when the piston rod 3 retracts to the end of its stroke, the outer end 411 of the buffer post 41 is adapted to be inserted into the buffer hole 121 of the flow channel 12.
[0058] like Figure 4 As shown, in some embodiments, the outer end 411 of the buffer post 41 is provided with at least one oblique cut 412; wherein the oblique cut 412 extends along the end face of the buffer post 41 to the center.
[0059] like Figure 3 As shown, in some embodiments, an annular boss 413 is provided in the middle of the buffer post 41; the elastic member 42 is sleeved on the inner end 414 of the buffer post 41 and abuts against the annular boss 413 to push the buffer post 41.
[0060] In summary, this hydraulic cylinder with a buffer function, by setting an elastic buffer mechanism 4, gradually inserts the elastic buffer mechanism 4 into the flow channel 12 when the piston rod 3 retracts at the end of its stroke. This buffers the retraction of the hydraulic cylinder through throttling, and also causes the elastic buffer mechanism 4 to retract under force at the beginning of the piston rod 3's extension stroke. This facilitates high-pressure flow, quickly opens the rodless chamber oil port, and introduces high-pressure hydraulic oil to enable the hydraulic cylinder to work normally.
[0061] In this document, when it is said that the first component is located on the second component, this can mean that the first component can be directly formed on the second component, or that the third component can be inserted between the first component and the second component.
[0062] In this document, when an element or layer is referred to as being "on", "engaged to", "connected to", "attached to" or "coupled to" another element or layer, it can be directly on, engaged, connected, attached or coupled to the other element or layer, or intervening elements or layers can be present. In contrast, when an element is referred to as being "directly on", "directly engaged to", "directly connected to", "directly attached to" or "directly coupled to" another element or layer, there are no intervening elements or layers present. Other words used to describe the relationship between elements should be interpreted in a like fashion (e.g., "between" versus "directly between", "adjacent" versus "directly adjacent", etc.). As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.
[0063] In this document, example embodiments of the disclosure will be described in greater detail with reference to the accompanying drawings. As used herein, expressions such as "at least one of," when preceding a list of two or more items, modify the entire list of items and do not modify the individual items of the list.
[0064] The terminology used herein is for the purpose of describing particular example configurations only and is not intended to be limiting. As used herein, the singular articles "a," "an," and "the" can be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order
[0065] As used herein, the phrases "in an embodiment," "according to an embodiment," "in some embodiments," and the like, generally mean the particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of the present disclosure. Thus, appearances of such phrases in various places throughout this specification do not necessarily all refer to the same embodiment. As used herein, the term "example" or "exemplary" means "serving as an example, instance, or illustration." Any implementation, aspect or design described herein as "example" or "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations, aspects or designs. Rather, the term "example" or "exemplary" is intended to present concepts in a concrete manner.
[0066] In the description of the embodiments of the utility model, unless otherwise clear and definite, the terms "mount", "connect", "connection" should be understood in broad sense, for example, it can be fixed connection, also can be detachable connection, or integrally connected, it can be mechanical connection, also can be electrical connection, it can be direct connection, also can be indirect connection through intermediate medium, it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.
[0067] In the description of the utility model, it needs to be explained that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model. In addition, terms such as "first", "second" and other numerical terms are used in this document, unless otherwise indicated in this document. Therefore, the above-discussed first element, component, region, layer or section can be referred to as the second element, component, region, layer or section without departing from the teachings of the example embodiments.
[0068] Spatially relative terms, such as "inner", "outer", "beneath", "below", "lower", "above", "upper" and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. The spatially relative terms can be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the example term "below" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
[0069] In the above discussion, unless otherwise stated, the terms "about", "approximately", "substantially" and the like, when used in describing numerical values, mean a + / - 10% variation of the value.
[0070] With the above ideal embodiments according to the utility model as inspiration, through the above description, relevant staff can definitely make various changes and modifications without deviating from the technical idea of the utility model. The technical scope of the utility model is not limited to the contents in the specification, and the technical scope must be determined according to the scope of claims.
Claims
1. A hydraulic cylinder with a buffer function, characterized in that, include: The cylinder body (1) has a piston chamber (11) inside it. Piston (2) is slidably disposed within piston chamber (11); The piston rod (3) has one end adapted to be inserted into the piston chamber (11) and connected to the piston (2), and the piston chamber (11) is divided into a rod chamber (111) and a rodless chamber (112). The elastic buffer mechanism (4) is inserted into the piston rod (3) and extends into the rodless cavity (112); The cylinder body (1) is provided with a flow channel (12), and one end of the flow channel (12) is connected to the rodless cavity (112); At the end of the retraction stroke of the piston rod (3), the elastic buffer mechanism (4) on the piston rod (3) is inserted into the flow channel (12) to gradually throttle the flow; and At the beginning of the piston rod (3) extension stroke, the oil in the flow channel (12) squeezes the elastic buffer mechanism (4) to retract the elastic buffer mechanism (4).
2. The hydraulic cylinder with buffer function as described in claim 1, characterized in that, The piston rod (3) has an installation chamber (31) along its axis on the end face facing the rodless cavity (112). The elastic buffer mechanism (4) includes: A buffer column (41) is installed inside the mounting chamber (31); The elastic element (42) is located in the mounting chamber (31) and sleeved on the buffer column (41), and is adapted to push the buffer column (41) so that its outer end (411) extends into the rodless cavity (112); When the piston rod (3) retracts to the end of its stroke, the outer end (411) of the buffer column (41) is adapted to be inserted into the flow channel (12).
3. The hydraulic cylinder with buffer function as described in claim 2, characterized in that, The flow channel (12) includes: a buffer hole (121), which is connected to the rodless cavity (112), and the buffer hole (121) is coaxially arranged with the buffer column (41); When the piston rod (3) retracts to the end of its stroke, the buffer column (41) is adapted to be inserted into the buffer hole (121) and form a gradually decreasing annular gap (122) to throttle.
4. The hydraulic cylinder with buffer function as described in claim 2, characterized in that, The outer end (411) of the buffer column (41) is provided with at least one oblique cut (412). The oblique cut (412) extends along the end face of the buffer post (41) to the center; When the piston rod (3) retracts to the end of its stroke, the buffer post (41) is adapted to be inserted into the buffer hole (121) and form a gradually decreasing annular gap (122) through the oblique cut (412).
5. The hydraulic cylinder with buffer function as described in claim 2, characterized in that, The buffer column (41) is provided with an annular boss (413) in the middle. The elastic element (42) is sleeved on the inner end (414) of the buffer column (41), and one end of the elastic element (42) abuts against the mounting chamber (31), and the other end abuts against the annular boss (413).
6. The hydraulic cylinder with buffer function as described in claim 5, characterized in that, The inner wall of the installation chamber (31) is provided with an annular installation position (311), and a limit component (312) is provided in the annular installation position (311). The limiting component (312) is located outside the annular boss (413) and is adapted to prevent the buffer post (41) from disengaging from the mounting chamber (31). The limiting component (312) includes a retaining ring (313) and a retaining ring (314).
7. The hydraulic cylinder with buffer function as described in claim 5, characterized in that, The flow channel (12) further includes: an extension hole (123), one end of which is connected to the buffer hole (121) and the other end extends to the side wall of the cylinder (1); Wherein, at the end of the retraction stroke of the piston rod (3), the connection between the extension hole (123) and the buffer hole (121) is located outside the buffer column (41).
8. An elastic buffer mechanism for a hydraulic cylinder with a buffering function, characterized in that, include: The buffer column (41) is inserted at the axis of the piston rod (3); The elastic element (42) is connected to the buffer column (41) and is adapted to push the buffer column (41) to protrude from the end face of the piston rod (3); When the piston rod (3) retracts to the end of its stroke, the outer end (411) of the buffer column (41) is adapted to be inserted into the buffer hole (121) of the flow channel (12).
9. The elastic buffer mechanism for a hydraulic cylinder with a buffering function as described in claim 8, characterized in that, The outer end (411) of the buffer column (41) is provided with at least one oblique cut (412). The oblique cut (412) extends along the end face of the buffer post (41) to the center; When the piston rod (3) retracts to the end of its stroke, the buffer post (41) is adapted to be inserted into the buffer hole (121) and form a gradually decreasing annular gap (122) through the oblique cut (412).
10. The elastic buffer mechanism for a hydraulic cylinder with a buffering function as described in claim 8, characterized in that, The buffer column (41) is provided with an annular boss (413) in the middle. The elastic element (42) is sleeved on the inner end (414) of the buffer post (41) and abuts against the annular boss (413) to push the buffer post (41).