Buffer device and bulldozer scraper knife system
By setting a switching channel and a buffer device for the valve core on the piston, the bidirectional buffering problem during the high-speed reciprocating movement of the piston is solved, the cylinder is stabilized and vibration is reduced.
Patent Information
- Application Number
- CN202520288106.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-23
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2035-02-23
AI Technical Summary
In the prior art, when the piston moves back and forth at high speed, it is difficult to achieve bidirectional buffering at the bottom of the cylinder, which causes the cylinder to vibrate. Buffering structures need to be set in two directions respectively.
Design a buffer device by setting a switching channel and a valve core on the piston. The valve core switches the flow channel when the piston approaches the bottom of the cylinder, so that the oil on the high-pressure side flows into the low-pressure side, thereby buffering the piston.
It achieves bidirectional buffering during the reciprocating movement of the piston, reduces cylinder vibration, simplifies the structure, and reduces design complexity.
Smart Images
Figure CN223578656U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the general hydraulic technology field, specifically relating to a hydraulic system with a straight cylinder, and more particularly to a buffer device and a bulldozer blade system. Background Technology
[0002] During the high-speed reciprocating motion of the piston, it is necessary to reduce the speed when it reaches the bottom of the cylinder to avoid the impact of pressure or piston collision that could cause severe vibration of the cylinder.
[0003] In related technologies, the pressure is generally increased by adjusting the buffer gap, increasing the angle of the flat wire, or changing the cross-sectional size, thereby generating back pressure and playing a buffering role. However, in the above scheme, the structure can only play a buffering role in one direction. In order to achieve bidirectional buffering, the structure needs to be set in two directions respectively.
[0004] Therefore, how to achieve bidirectional buffering through a single device is a technical problem that urgently needs to be solved by those skilled in the art.
[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Utility Model Content
[0006] This disclosure provides at least one buffer device and a bulldozer blade system.
[0007] In a first aspect, embodiments of this disclosure provide a buffer device, comprising: a cylinder, a piston rod, and a piston, wherein the piston rod is connected to the piston, and the piston is located within the cylinder to divide the cylinder into a first chamber and a second chamber. The piston has at least one switching channel, which includes: a mounting through-hole, a first flow channel, and a second flow channel. One end of the first flow channel communicates with the first chamber, and the other end communicates with the mounting through-hole. One end of the second flow channel communicates with the second chamber, and the other end communicates with the mounting through-hole. A valve core is disposed within the mounting through-hole, and the valve core is adapted to cut off the first flow channel or the second flow channel by force-driven movement. When a hydraulic pump pumps oil to one chamber to increase pressure, the valve core moves towards the other chamber following the piston. When the piston moves to the end of its stroke, the valve core moves under force to switch the required cut-off flow channel, and during the switching process, connects the two chambers, allowing oil in the pumping chamber to flow into the other chamber to buffer the piston.
[0008] In an alternative embodiment, the mounting hole is axially formed in the piston; the valve core is slidingly arranged in the mounting hole and the middle part is inwardly contracted to form a communication area; wherein the valve core is adapted to cut off the corresponding flow channel through the corresponding end part, and the first flow channel and the second flow channel are communicated through the communication area of the middle part to buffer the piston during switching the required flow channel to be cut off.
[0009] In an alternative embodiment, the length of the valve core is greater than the length of the mounting hole; wherein when one end part of the valve core cuts off the corresponding flow channel, the other end part protrudes out of the mounting hole.
[0010] In an alternative embodiment, the two end faces of the piston respectively extend outwardly and form limiting rings; the outer sides of the two limiting rings are respectively provided with a retainer; wherein the retainer is adapted to abut against the end part of the valve core to limit the movement.
[0011] In an alternative embodiment, the two retainers are respectively sleeved on the piston rod; the two side bottoms of the cylinder body are respectively provided with an avoiding position for avoiding the retainer; wherein when the piston moves to the end of the stroke, the retainer is adapted to enter the avoiding position to make the side bottom abut against the valve core.
[0012] In an alternative embodiment, the radius r of the retainer is less than the maximum distance L between the valve core and the axis of the piston rod, and the radius R of the avoiding position is less than the maximum distance L between the valve core and the axis of the piston rod.
[0013] In an alternative embodiment, the two end parts of the valve core are both sealing areas adapted to seal the corresponding flow channel; wherein the length M of the sealing area is greater than the width N of the limiting ring.
[0014] In an alternative embodiment, the valve core comprises a first column and a second column; the first column and the second column are both arranged in the mounting hole; the end parts of the first column and the second column opposite to each other are the sealing areas; and the end parts of the first column and the second column facing each other are inwardly contracted to jointly form the communication area.
[0015] In an alternative embodiment, the first flow channel comprises a first axial channel and a first radial channel; the first radial channel is communicated with the middle part of the mounting hole; one end of the first axial channel is communicated with the first chamber, and the other end is communicated with the first radial channel; and / or, the second flow channel comprises a second axial channel and a second radial channel; the second radial channel is communicated with the middle part of the mounting hole; one end of the second axial channel is communicated with the second chamber, and the other end is communicated with the second radial channel.
[0016] In a second aspect, the embodiments of the present disclosure provide a bulldozer blade system comprising a buffering device.
[0017] The beneficial effects of the utility model are that the valve core of the buffer device reciprocates with the piston, and when the piston approaches the cylinder bottom of the corresponding side, the first chamber and the second chamber are communicated through the force movement of the valve core, so that the oil liquid of the high-pressure side flows into the low-pressure side, thereby realizing the buffering of the piston.
[0018] Other features and advantages of the utility model will be set forth in the subsequent description, and some of them become apparent from the description, or are understood by implementing the utility model. The purposes and other advantages of the utility model are realized and obtained by the structures specially pointed out in the description and the drawings.
[0019] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the preferred embodiments are described in detail in this paper, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS
[0020] In order to more clearly illustrate the specific embodiment of the utility model or the technical scheme in the prior art, the drawings needed in the specific embodiment or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.
[0021] Figure 1 A structure schematic view when the piston moves towards the second chamber is provided for the embodiment of the disclosure;
[0022] Figure 2 A structure schematic view when the first chamber and the second chamber are communicated is provided for the embodiment of the disclosure;
[0023] Figure 3 A structure schematic view after the valve core switches and blocks the flow channel is provided for the embodiment of the disclosure;
[0024] Figure 4 A structure schematic view of the valve core is provided for the embodiment of the disclosure.
[0025] In the drawings:
[0026] Cylinder body 1, first chamber 11, second chamber 12, cylinder bottom 13;
[0027] Piston rod 2;
[0028] Piston 3, mounting through hole 31, first flow channel 32, first axial passage 321, first radial passage 322, second flow channel 33, second axial passage 331, second radial passage 332, limiting ring 34;
[0029] Valve core 4, connecting area 41, blocking area 42, first column 43, second column 44;
[0030] 5. Detailed Implementation
[0031] 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.
[0032] 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.
[0033] 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.
[0034] like Figure 1 As shown, at least one embodiment provides a buffer device, including: a cylinder 1, a piston rod 2 and a piston 3, the piston rod 2 being connected to the piston 3, the piston 3 being located inside the cylinder 1 to divide the cylinder 1 into a first chamber 11 and a second chamber 12; wherein, the piston rod 2 is connected to a drive source, and the piston 3 is reciprocated within the cylinder 1 by the drive source.
[0035] like Figure 1 As shown, in some embodiments, the piston 3 is provided with at least one switching channel, which includes: a mounting through hole 31, a first flow channel 32, and a second flow channel 33; one end of the first flow channel 32 is connected to the first chamber 11, and the other end is connected to the mounting through hole 31; one end of the second flow channel 33 is connected to the second chamber 12, and the other end is connected to the mounting through hole 31, thereby forming an oil passage between the first flow channel 32, the mounting through hole 31, and the second flow channel 33; preferably, the number of switching channels is an even number, and they are evenly distributed.
[0036] like Figure 1 As shown, in some embodiments, the valve core 4 is disposed in the mounting through hole 31, and the oil passage is disconnected by blocking the first flow channel 32 or the second flow channel 33, thereby avoiding internal leakage between the first chamber 11 and the second chamber 12.
[0037] In some embodiments, a hydraulic pump pumps oil to the first chamber 11 or the second chamber 12, so that the piston 3 is pressed to reciprocate in the cylinder 1.
[0038] In one application scenario, as shown in Figure 1 , the hydraulic pump pumps oil to the first chamber 11, so that the pressure in the first chamber 11 increases to push the piston 3 to extrude the second chamber 12, and the valve core 4 in the mounting through hole 31 is pressed to move to cut off the first flow channel 32 to prevent internal leakage; as shown in Figure 2 , when the piston 3 moves to the end of the stroke, the valve core 4 first abuts against the cylinder bottom 13 on the side of the second chamber 12, so that the valve core 4 is forced to move relative to the piston 3 until it is switched to cut off the second flow channel 33; as shown in Figure 2 , during the switching process, the valve core 4 first opens the first flow channel 32 to connect the first chamber 11 and the second chamber 12, at this time the pressure in the first chamber 11 is greater than that in the second chamber 12, that is, the oil in the first chamber 11 flows into the second chamber 12 through the open flow channel, so that the pressure in the second chamber 12 increases, thereby playing a buffering role; as shown in Figure 3 , when the buffering is completed, the valve core 4 at this time is in a state of cutting off the second flow channel 33, thereby avoiding internal leakage between the first chamber 11 and the second chamber 12.
[0039] In another application scenario, the hydraulic pump pumps oil to the second chamber 12; the principle of buffering of the piston 3 is the same as that in the process of pumping oil to the first chamber 11 by the hydraulic pump, which will not be described here.
[0040] According to the above two application scenarios, the valve core 4 only needs to reciprocate with the piston 3, and when the piston 3 approaches the cylinder bottom 13 on the corresponding side, the first chamber 11 and the second chamber 12 are connected through the forced movement of the valve core 4, so that the oil on the high-pressure side flows into the low-pressure side, thereby achieving buffering of the piston 3.
[0041] As shown in Figure 2 , in some embodiments, the mounting through hole 31 is provided along the axial direction of the piston 3; the valve core 4 is slidingly arranged in the mounting through hole 31, and the middle part is inwardly contracted to form a communication area 41; wherein the valve core 4 is adapted to cut off the corresponding flow channel through the corresponding end part, and during the switching process required to cut off the flow channel, the first flow channel 32 and the second flow channel 33 are connected through the communication area 41 in the middle part to achieve buffering of the piston 3.
[0042] In this embodiment, one end of the valve core 4 is used to open and close the first flow channel 32, and the other end is used to open and close the second flow channel 33; during the buffering process, the first flow channel 32 and the second flow channel 33 are both connected with the communication area 41.
[0043] As shown in Figure 3As shown in the drawings, in some embodiments, the length of the valve core 4 is greater than the length of the mounting through hole 31.
[0044] In the present embodiment, when the corresponding flow passage is truncated at one end of the valve core 4, the other end protrudes into the mounting through hole 31, so that the valve core 4 can approach the cylinder bottom 13 before the piston 3, thereby opening the oil passage to buffer the piston 3.
[0045] As shown in the drawings, in some embodiments, the two end faces of the piston 3 respectively extend outward and form limit rings 34; the outer sides of the two limit rings 34 are respectively provided with a retainer 5. Figure 2
[0046] In the present embodiment, the valve core 4 moves in the mounting through hole 31, and the limit ring 34 leaves a distance to facilitate the protrusion of the valve core 4 from the piston 3; the retainer 5 limits the movement distance of the valve core 4 to prevent the valve core 4 from being separated from the mounting through hole 31.
[0047] As shown in the drawings, in some embodiments, the two retainers 5 are respectively sleeved on the piston rod 2; the two cylinder bottoms 13 of the cylinder body 1 are respectively provided with an avoidance position 14 for avoiding the retainer 5. Figure 2
[0048] In the present embodiment, when the piston 3 moves to the end of the stroke, the retainer 5 enters the avoidance position 14, so that the cylinder bottom 13 can abut against the valve core 4, thereby moving the valve core 4 relative to the piston 3.
[0049] As shown in the drawings, in some embodiments, the radius r of the retainer 5 is less than the maximum distance L between the valve core 4 and the piston rod axis, and the radius R of the avoidance position 14 is less than the maximum distance L between the valve core 4 and the piston rod axis, that is, the valve core 4 is not completely blocked by the retainer 5, and the valve core 4 does not extend into the avoidance position 14. Figure 3
[0050] As shown in the drawings, in some embodiments, the two end portions of the valve core 4 are respectively sealing zones 42, and the sealing zones 42 are adapted to seal the corresponding flow passages; the length M of the sealing zone 42 is greater than the width N of the limit ring 34, that is, the sealing zone 42 of the valve core 4 does not completely separate from the mounting through hole 31, so that the valve core 4 is not inclined. Figure 3 As shown in the drawings, in some embodiments, the valve core 4 comprises a first column 43 and a second column 44; the first column 43 and the second column 44 are respectively arranged in the mounting through hole 31; the end portions of the first column 43 and the second column 44 opposite to each other are sealing zones 42; the end portions of the first column 43 and the second column 44 facing each other are inwardly retracted to jointly form a communication zone 41.
[0051] Figure 4
[0052] In the embodiment, the valve core 4 can be a complete cylinder or can be composed of a first cylinder 43 and a second cylinder 44, as long as the two ends can block the flow passage and the middle part can communicate the flow passage.
[0053] As shown in Figure 4 In some embodiments, the first flow passage 32 includes a first axial passage 321 and a first radial passage 322; the first radial passage 322 communicates with the middle part of the mounting through hole 31; one end of the first axial passage 321 communicates with the first chamber 11 and the other end communicates with the first radial passage 322.
[0054] As shown in Figure 4 In some embodiments, the second flow passage 33 includes a second axial passage 331 and a second radial passage 332; the second radial passage 332 communicates with the middle part of the mounting through hole 31; one end of the second axial passage 331 communicates with the second chamber 12 and the other end communicates with the second radial passage 332.
[0055] In the embodiment, the first flow passage 32 and the second flow passage 33 adopt the form of axial passage and radial passage combination, which is to facilitate the opening of the first flow passage 32 and the second flow passage 33.
[0056] At least one embodiment also provides a bulldozer blade system including the buffer device.
[0057] For the specific structure and implementation process of the buffer device, please refer to the relevant discussion in the above embodiments, which will not be repeated here.
[0058] In summary, the valve core 4 of the buffer device and the bulldozer blade system reciprocates with the piston 3, and when the piston 3 approaches the corresponding side of the cylinder bottom 13, the first chamber 11 and the second chamber 12 are communicated through the forced movement of the valve core 4, so that the oil liquid of the high pressure side flows into the low pressure side, thereby achieving the buffering of the piston 3.
[0059] In this document, when it is mentioned that a first component is located on a second component, it can mean that the first component can be directly formed on the second component, or a third component can be interposed between the first component and the second component.
[0060] 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.
[0061] 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.
[0062] 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
[0063] 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.
[0064] 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.
[0065] 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.
[0066] 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.
[0067] 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.
[0068] 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 buffer device, comprising: A cylinder body (1), a piston rod (2), and a piston (3), wherein the piston rod (2) is connected to the piston (3), and the piston (3) is located inside the cylinder body (1) to divide the cylinder body (1) into a first chamber (11) and a second chamber (12), characterized in that, The piston (3) is provided with at least one switching channel, the switching channel including: mounting through hole (31), first flow channel (32) and second flow channel (33); One end of the first flow channel (32) is connected to the first chamber (11), and the other end is connected to the mounting through hole (31); One end of the second flow channel (33) is connected to the second chamber (12), and the other end is connected to the mounting through hole (31); A valve core (4) is provided in the mounting through hole (31), and the valve core (4) is adapted to cut off the first flow channel (32) or the second flow channel (33) by moving under force. When the hydraulic pump pumps oil to one chamber to increase pressure, the valve core (4) moves toward the other chamber along with the piston (3). When the piston (3) moves to the end of its stroke, the valve core (4) is forced to move to switch the flow path to be cut off. During the switching process, the two chambers are connected so that the oil in the pump chamber flows into the other chamber to buffer the piston (3).
2. The buffer device as described in claim 1, characterized in that, The mounting through hole (31) is opened along the axial direction of the piston (3); The valve core (4) is slidably disposed in the mounting through hole (31), and the middle part is contracted inward to form a connecting area (41). The valve core (4) is adapted to cut off the corresponding flow channel through the corresponding end, and during the process of switching the flow channel to be cut off, the first flow channel (32) and the second flow channel (33) are connected through the middle connecting area (41) to buffer the piston (3).
3. The buffer device as described in claim 2, characterized in that, The length of the valve core (4) is greater than the length of the mounting through hole (31); When the corresponding flow channel is cut off at one end of the valve core (4), the other end protrudes into the mounting through hole (31).
4. The buffer device as described in claim 3, characterized in that, The two ends of the piston (3) extend outward to form limiting rings (34); Both of the aforementioned limiting rings (34) are provided with retaining rings (5) on their outer sides; The retaining ring (5) is adapted to abut against the end of the valve core (4) to limit its position.
5. The buffer device as described in claim 4, characterized in that, Both retaining rings (5) are fitted onto the piston rod (2); Both sides of the cylinder bottom (13) of the cylinder body (1) are provided with clearance positions (14) for avoiding the retaining ring (5). When the piston (3) moves to the end of its stroke, the retaining ring (5) is adapted to enter the clearance position (14) so that the cylinder bottom (13) abuts against the valve core (4).
6. The buffer device as described in claim 5, characterized in that, The radius r of the retaining ring (5) is less than the maximum distance L between the valve core (4) and the piston rod axis, and the radius R of the clearance position (14) is less than the maximum distance L between the valve core (4) and the piston rod axis.
7. The buffer device as described in claim 4, characterized in that, Both ends of the valve core (4) are sealing areas (42), and the sealing areas (42) are suitable for sealing the corresponding flow channels; The length M of the blocking area (42) is greater than the width N of the limiting ring (34).
8. The buffer device as described in claim 7, characterized in that, The valve core (4) includes: a first column (43) and a second column (44); Both the first column (43) and the second column (44) are disposed within the mounting through hole (31); The opposite ends of the first column (43) and the second column (44) form the blocking area (42). The ends of the first column (43) and the second column (44) face inward to form the connecting area (41).
9. The buffer device as claimed in claim 1, characterized in that, The first flow channel (32) includes: a first axial channel (321) and a first radial channel (322); The first radial channel (322) is connected to the middle of the mounting through hole (31); One end of the first axial channel (321) is connected to the first chamber (11), and the other end is connected to the first radial channel (322); and / or, The second flow channel (33) includes: a second axial channel (331) and a second radial channel (332); The second radial channel (332) communicates with the middle of the mounting through hole (31); One end of the second axial channel (331) is connected to the second chamber (12), and the other end is connected to the second radial channel (332).
10. A bulldozer blade system, characterized in that, Includes the buffer device as described in any one of claims 1-9.