Oil cylinder for series connection, multi-oil-cylinder series connection module and operation machine
By setting an oil guide channel on the inner wall of the cylinder, automatic oil replenishment of the cylinder is realized, which solves the problem of inconsistent stroke during synchronous movement of the cylinder, ensures the synchronicity and synchronous movement of multiple cylinders, and facilitates maintenance.
Patent Information
- Application Number
- CN202520132062.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-17
- Publication Date
- 2025-11-28
- Estimated Expiration
- 2035-01-17
AI Technical Summary
In the prior art, when the hydraulic cylinders move synchronously, leakage in the closed working chamber can easily lead to inconsistent strokes, making it difficult to ensure the synchronization of multiple hydraulic cylinders.
Design a series hydraulic cylinder. By setting an oil guide channel on the inner wall of the cylinder, when the piston rod of the upper cylinder extends to the position, hydraulic oil is replenished to the rodless chamber of the lower cylinder through the oil guide channel, realizing automatic oil replenishment of the closed working chamber, ensuring that the lower cylinder extends to the position and ensuring synchronous movement.
It achieves synchronization between hydraulic cylinders, avoids abnormal wear of seals, and makes the oil guide channel easy to process and maintain.
Smart Images
Figure CN223608990U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application belongs to the technical field of working machines, and particularly relates to a series connection oil cylinder, a multi-oil cylinder series connection module and a working machine. BACKGROUND
[0002] Some agricultural working machines and engineering working machines need synchronous movement between multiple oil cylinders during work. For example, the leveling of a cutting table in an agricultural machine requires synchronous movement of left and right leveling oil cylinders to level the left and right ends of the cutting table, or a lifting machine in an aerial working machine needs synchronous movement of two supporting oil cylinders to keep the working table balanced.
[0003] The prior art generally uses a series connection of oil cylinders to ensure synchronous movement of multiple oil cylinders. For example, taking a main oil cylinder and an auxiliary oil cylinder as an example, the prior art generally connects the rod cavity of the main oil cylinder and the rodless cavity of the auxiliary oil cylinder in series, and forms a closed working cavity with the rod cavity of the main oil cylinder and the rodless cavity of the auxiliary oil cylinder. When the rodless cavity of the main oil cylinder is filled with oil, the piston rod of the main oil cylinder will push the hydraulic oil in the rod cavity of the main oil cylinder into the rodless cavity of the auxiliary oil cylinder, thereby pushing the auxiliary oil cylinder to extend together. During the work process, the total oil volume of the closed working cavity remains unchanged to ensure the synchronism of movement. However, in the process of use, once the closed working cavity leaks, the strokes of the two oil cylinders cannot be maintained synchronously. CONTENT OF THE UTILITY MODEL
[0004] In view of the above defects or deficiencies, the present application provides a series connection oil cylinder, a multi-oil cylinder series connection module and a working machine, aiming to solve the technical problem that the existing oil cylinder synchronous movement implementation method is prone to inconsistent strokes between oil cylinders.
[0005] To achieve the above-mentioned purpose, the present application provides a series connection oil cylinder, which comprises a cylinder body and a piston rod. The piston rod is slidably arranged in the cylinder body and separates the inner cavity of the cylinder body into a rod cavity and a rodless cavity. The front and rear ends of the cylinder body are respectively provided with a small cavity oil port for the rod cavity to enter and exit oil and a large cavity oil port for the rodless cavity to enter and exit oil. The outer side of the inner wall of the cylinder body is further provided with an oil guide channel, which is provided with a front end oil port and a rear end oil port arranged in front of and behind each other and respectively connected with the inner cavity of the cylinder body. The front end oil port of the oil guide channel is always connected with the rod cavity when the piston rod moves. When the extension stroke of the piston rod is less than a preset stroke, the rear end oil port of the oil guide channel is cut off from the rodless cavity. When the extension stroke of the piston rod exceeds the preset stroke, the rear end oil port of the oil guide channel is connected with the rodless cavity.
[0006] In the embodiment of the present application, the rear end oil port of the oil guide channel is located between the small cavity oil port and the large cavity oil port, and the front end oil port of the oil guide channel extends to be connected with the small cavity oil port.
[0007] In the embodiment of the present application, the cylinder body comprises a body portion and a first interface portion arranged outside the front end of the body portion, the small cavity oil port is arranged on the first interface portion and extends to communicate with the rod cavity, the oil guide channel comprises a first channel portion arranged on the first interface portion and a second channel portion arranged on the peripheral wall of the body portion, the second channel portion is located between the small cavity oil port and the large cavity oil port, the first channel portion is arranged in position with the second channel portion, and the front end of the first channel portion extends to communicate with the small cavity oil port.
[0008] In the embodiment of the present application, the cylinder body further comprises a second interface portion arranged outside the rear end of the body portion, and the large cavity oil port is arranged on the second interface portion and extends to communicate with the rodless cavity.
[0009] In the embodiment of the present application, the piston rod comprises a piston portion and a rod body portion, when the piston rod extends to a preset stroke, the rear end surface of the piston portion is radially aligned with the rear end oil port.
[0010] In the embodiment of the present application, the limit extension stroke of the piston rod is equal to or greater than the preset stroke.
[0011] In the embodiment of the present application, the oil cylinder further comprises a guide body arranged in the cylinder body and located at the front end of the cylinder body, and the piston rod is slidingly arranged in the cylinder body and the rod body portion of the cylinder body penetrates forward from the guide body.
[0012] In the embodiment of the present application, a sealing member is arranged between the piston rod and the inner wall of the cylinder body.
[0013] To achieve the above-mentioned purpose, the present application further provides a multi-cylinder series module, wherein the multi-cylinder series module comprises a primary cylinder and a secondary cylinder, the primary cylinder is the series-used cylinder as described above, the rodless cavity inlet and outlet port of the secondary cylinder is connected with the small cavity oil port of the primary cylinder through a pipeline, and the secondary cylinder is further provided with a rod cavity inlet and outlet port.
[0014] To achieve the above-mentioned purpose, the present application further provides a working machine, wherein the working machine comprises the multi-cylinder series module as described above.
[0015] Through the above technical solution, the series-used cylinder provided by the embodiment of the present application has the following beneficial effects:
[0016] The tandem oil cylinder is generally set with the oil amount in the closed working chamber, the cylinder diameter of the upper oil cylinder and the lower oil cylinder during factory debugging, so that the lower oil cylinder also extends to the target stroke when the piston rod of the upper oil cylinder reaches a stroke. When the piston rod of the upper oil cylinder extends to the position, some tandem oil cylinders configure the stroke of the lower oil cylinder to extend to the position synchronously, but due to the influence of the leakage in the closed working chamber, the lower oil cylinder may not extend completely when the piston rod of the upper oil cylinder extends to the position. The tandem oil cylinder in the application can realize automatic oil supplement of the closed working chamber when being connected with other oil cylinders, so as to realize synchronous movement self-adaptive adjustment of the upper oil cylinder and the lower oil cylinder and ensure the synchronism of the movement strokes of the two oil cylinders. Meanwhile, the oil guide channel in the tandem oil cylinder is arranged on the outside of the inner wall of the cylinder body, so that the integrity of the inner wall of the cylinder body is not damaged to cause abnormal wear of the sealing ring. Furthermore, the oil guide channel in the tandem oil cylinder can be directly machined from the outside of the cylinder body by using the drilling process, which is convenient for machining and maintenance when the oil guide channel is blocked.
[0017] Other features and advantages of the present application will be described in detail in the following detailed description. BRIEF DESCRIPTION OF DRAWINGS
[0018] The accompanying drawings are included to provide a further understanding of the application, and are incorporated in and constitute a part of this specification, illustrate embodiments of the application, and together with the description serve to explain the principles of the application. In the drawings:
[0019] Figure 1 is a structure schematic view of the tandem oil cylinder in the embodiment of the application;
[0020] Figure 2 is a connection schematic view of the multi-oil cylinder tandem module in the embodiment of the application.
[0021] REFERENCE NUMERALS
[0022] 1, primary oil cylinder; 11, cylinder body; 11a, small cavity oil port; 11b, large cavity oil port; 11c, oil guide channel; 11c1, first channel part; 11c2, second channel part; 111, body part; 112, first interface part; 113, second interface part; 12, piston rod; 121, piston part; 122, rod body part; 13, guide body; 14, sealing element; 2, secondary oil cylinder; 21, rodless cavity inlet and outlet oil port; 22, rod cavity inlet and outlet oil port. Detailed Implementation
[0023] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this application.
[0024] The hydraulic cylinders for series connection in this application are described below with reference to the accompanying drawings.
[0025] This application provides a hydraulic cylinder for series connection, wherein, as Figure 1 and Figure 2 As shown, the hydraulic cylinder used in series includes a cylinder body 11 and a piston rod 12.
[0026] The piston rod 12 is slidably disposed inside the cylinder 11 and divides the inner cavity of the cylinder 11 into a rod chamber and a rodless chamber.
[0027] The cylinder body 11 has a small oil port 11a for supplying oil to the rod chamber and a large oil port 11b for supplying oil to the rodless chamber at its front and rear ends, respectively. The inner wall of the cylinder body 11 also has an oil guide channel 11c on its outer side. The oil guide channel 11c has a front oil port and a rear oil port that are spaced apart and communicate with the inner cavity of the cylinder body 11.
[0028] The oil port at the front end of the oil guide channel 11c is always connected to the rod chamber when the piston rod 12 moves. When the extension stroke of the piston rod 12 is less than the preset stroke, the oil port at the rear end of the oil guide channel 11c is cut off from the rodless chamber. When the extension stroke of the piston rod 12 exceeds the preset stroke, the oil port at the rear end of the oil guide channel 11c is connected to the rodless chamber.
[0029] Hydraulic cylinders used in series are generally used in series with other hydraulic cylinders. Series connection refers to connecting the small cavity port 11a of the hydraulic cylinder in this application with the rodless cavity of other hydraulic cylinders. Between two hydraulic cylinders in series, the hydraulic cylinder in this application is the upper-level hydraulic cylinder (hereinafter referred to as the upper-level hydraulic cylinder in this application), and the other hydraulic cylinders are lower-level hydraulic cylinders. The rod cavity of the upper-level hydraulic cylinder and the rodless cavity of the lower-level hydraulic cylinder form a closed working chamber.
[0030] When oil enters the large chamber port 11b of the upper cylinder, if the extension stroke of the piston rod 12 of the upper cylinder is less than the preset stroke, the pressurized oil will enter the rodless chamber of the upper cylinder from the large chamber port 11b and push the piston rod 12 of the upper cylinder to extend. The movement of the piston rod 12 will push the hydraulic oil in the rod chamber out of the small chamber port 11a and discharge it to the rodless chamber of the lower cylinder, so as to realize the synchronous extension of the lower cylinder.
[0031] The tandem oil cylinder is generally set to the oil amount in the closed working chamber, the cylinder diameter of the upper oil cylinder and the lower oil cylinder during factory debugging, so that the lower oil cylinder also extends to the target stroke when the piston rod 12 of the upper oil cylinder reaches a certain stroke. When the piston rod 12 of the upper oil cylinder extends to the position, some tandem oil cylinders configure the stroke of the lower oil cylinder to extend to the position synchronously, but due to the influence of leakage in the closed working chamber, the lower oil cylinder may not fully extend when the upper oil cylinder extends to the position. The oil cylinder in the application can realize oil supplementing of the closed working chamber by setting the oil guide channel 11c, so that the hydraulic oil in the rodless chamber continues to flow to the rodless chamber of the lower oil cylinder through the oil guide channel 11c and the small cavity oil port 11a, or flows to the rodless chamber of the lower oil cylinder through the oil guide channel 11c and then flows to the rodless chamber of the lower oil cylinder when the piston rod 12 of the upper oil cylinder extends to the position (or reaches the preset stroke), so as to realize oil supplementing of the closed working chamber, ensure that the lower oil cylinder fully extends to the position, and ensure the synchronization of the stroke of the lower oil cylinder and the upper oil cylinder. In summary, the tandem oil cylinder in the application can realize automatic oil supplementing of the closed working chamber when it is connected with other oil cylinders, so as to realize synchronous movement self-adaptive adjustment of the upper oil cylinder and the lower oil cylinder, and ensure the synchronization of the movement stroke of the two. Meanwhile, the oil guide channel 11c in the oil cylinder is arranged on the outer side of the inner wall of the cylinder body 11, so that the integrity of the inner wall of the cylinder body 11 is not damaged to cause abnormal wear of the sealing ring. Furthermore, the oil guide channel 11c in the oil cylinder can be directly machined from the outer side of the cylinder body 11 by using a drilling process, which is convenient for machining and maintenance when the oil guide channel 11c is blocked.
[0032] In the embodiment of the application, the front end oil port of the oil guide channel 11c is always in communication with the rod cavity when the piston rod 12 moves to any position.
[0033] In the embodiment of the application, in order to realize the function that the front end oil port is always in communication with the rod cavity, the front end oil port of the oil guide channel can extend to the front end of the cylinder body 11, or the front end oil port can extend to be directly in communication with the small cavity oil port 11a.
[0034] As Figure 1As shown in the embodiments of the present application, the cylinder body 11 can include a body part 111 and a first interface part 112 arranged outside the front end of the body part 111, the small cavity oil port 11a can be arranged on the first interface part 112 and extend to communicate with the rod cavity, the oil guide channel 11c includes a first channel part 11c1 arranged on the first interface part 112 and a second channel part 11c2 arranged on the peripheral wall of the body part 111, the second channel part 11c2 is a small hole arranged along the radial direction of the body part 111, and the second channel part 11c2 is located between the small cavity oil port 11a and the large cavity oil port 11b. The first interface part 112 is preferably detachably arranged, the first channel part 11c1 and the second channel part 11c2 are arranged in position after the first interface part 112 is installed, and the front end of the first channel part 11c1 extends to communicate with the small cavity oil port 11a. By arranging the main part of the oil guide channel 11c on the first interface part 112 and detachably arranging the first interface part 112, the maintenance is facilitated when the oil guide channel 11c is blocked.
[0035] As shown in the embodiments of the present application, Figure 1 and Figure 2 As shown in the embodiments of the present application, the cylinder body 11 further includes a second interface part 113 arranged outside the rear end of the body part 111, and the large cavity oil port 11b is arranged on the second interface part 113 and extends to communicate with the rodless cavity. The second interface part 113 is also preferably detachably arranged, and by arranging the large cavity oil port 11b on the second interface part 113, the machining is facilitated, and the structure of the punching area can be strengthened.
[0036] As shown in the embodiments of the present application, Figure 1 As shown in the embodiments of the present application, the piston rod 12 includes a piston part 121 and a rod body part 122, and when the piston rod 12 extends to a preset stroke, the rear end surface of the piston part 121 is radially aligned with the rear end oil port. Further, the limit extension stroke of the piston rod 12 is equal to or slightly greater than the preset stroke.
[0037] As shown in the embodiments of the present application, Figure 1 As shown in the embodiments of the present application, the oil cylinder further includes a guide body 13 arranged in the cylinder body 11 and located at the front end of the cylinder body 11, and the piston rod 12 is slidingly arranged in the cylinder body 11 and the rod body part 122 of the cylinder body 11 extends forward out of the guide body 13. The guide body 13 can guide the sliding of the rod body part 122.
[0038] It should be noted that the rod cavity refers to the space between the rear end of the guide body 13 and the front end of the piston part 121, and the rodless cavity refers to the space between the rear end of the piston part 121 and the rear end wall of the cylinder body 11. When the piston rod 12 moves, the volumes of the rod cavity and the rodless cavity are always changing.
[0039] As shown in the embodiments of the present application, Figure 1As shown in the embodiments of the present application, a sealing element 14 is arranged between the piston rod 12 and the inner wall of the cylinder 11. The sealing element 14 can realize the sealing between the rod cavity and the rodless cavity.
[0040] In the embodiments of the present application, in order to ensure the normal retraction of the upper oil cylinder and the lower oil cylinder, the oil guide channel 11c can be a throttling channel, or a one-way valve can be arranged in the oil guide channel 11c.
[0041] In the embodiments of the present application, a channel can also be arranged on the piston rod 12 to realize the above-mentioned synchronous motion adaptive adjustment function. The channel on the piston rod 12 can be a throttling channel, or a one-way valve can also be arranged in the channel on the piston rod 12 to ensure the normal pressure building of the oil cylinder.
[0042] As shown in Figure 1 and Figure 2 To achieve the above-mentioned purpose, the present application also provides a multi-oil cylinder series module, wherein the multi-oil cylinder series module comprises a first oil cylinder 1 and a second oil cylinder 2. The first oil cylinder 1 is the oil cylinder for series connection as described above. The rodless cavity inlet and outlet port 21 of the second oil cylinder 2 is connected with the small cavity oil port 11a of the first oil cylinder 1 by pipeline. The second oil cylinder 2 is also provided with a rod cavity inlet and outlet port 22. When the first oil cylinder 1 and the second oil cylinder 2 are connected in series, the first oil cylinder 1 constitutes an upper oil cylinder, and the second oil cylinder 2 constitutes a lower oil cylinder.
[0043] Further, the second oil cylinder 2 can also be the oil cylinder for series connection as described above. The multi-oil cylinder series module can also comprise a third oil cylinder, a fourth oil cylinder, etc. When the second oil cylinder 2 and the third oil cylinder are connected in series, the second oil cylinder 2 is an upper oil cylinder between the two oil cylinders, and the third oil cylinder is a lower oil cylinder between the two oil cylinders, and so on. Since the multi-oil cylinder series module adopts all the technical solutions of the above-mentioned embodiments, it at least has the beneficial effects brought by the above-mentioned embodiments, which will not be repeated here.
[0044] To achieve the above-mentioned purpose, the present application also provides a working machine, wherein the working machine comprises the multi-oil cylinder series module as described above. The working machine can be an agricultural machine, an engineering machine, an aerial working machine, etc.
[0045] In the description of the present application, it should be understood that the terms "first", "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.
[0046] In this application, unless otherwise clearly indicated and limited, the terms "mounting", "connection", "connecting", "fixed", and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection or communication with each other; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.
[0047] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.
[0048] Although the embodiments of the present application have been described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. Those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.
Claims
1. A tandem oil cylinder characterized by comprising: The series oil cylinder comprises a cylinder body (11) and a piston rod (12), the piston rod (12) is slidably arranged in the cylinder body (11) and divides the inner cavity of the cylinder body (11) into a rod cavity and a rodless cavity; The cylinder body (11) is provided with a small cavity oil port (11a) for the rod cavity to enter and exit oil and a large cavity oil port (11b) for the rodless cavity to enter and exit oil at the front and rear ends respectively, and the outer side of the inner wall of the cylinder body (11) is further provided with an oil guide channel (11c), the oil guide channel (11c) is provided with a front end oil port and a rear end oil port which are arranged at intervals and are respectively communicated with the inner cavity of the cylinder body (11); The front end oil port of the oil guide channel (11c) is always communicated with the rod cavity when the piston rod (12) moves, the rear end oil port of the oil guide channel (11c) is cut off from the rodless cavity when the extension stroke of the piston rod (12) is less than the preset stroke, and the rear end oil port of the oil guide channel (11c) is communicated with the rodless cavity when the extension stroke of the piston rod (12) exceeds the preset stroke.
2. The tandem oil cylinder according to claim 1, characterized in that, The rear end oil port of the oil guide channel (11c) is located between the small cavity oil port (11a) and the large cavity oil port (11b), and the front end oil port of the oil guide channel (11c) extends to be directly communicated with the small cavity oil port (11a).
3. The tandem oil cylinder according to claim 2, wherein The cylinder body (11) comprises a body part (111) and a first interface part (112) arranged at the front end of the body part (111), the small cavity oil port (11a) is opened on the first interface part (112) and extends to be communicated with the rod cavity, the oil guide channel (11c) comprises a first channel part (11c1) arranged on the first interface part (112) and a second channel part (11c2) arranged on the peripheral wall of the body part (111), the second channel part (11c2) is located between the small cavity oil port (11a) and the large cavity oil port (11b), the first channel part (11c1) and the second channel part (11c2) are arranged in position, and the front end of the first channel part (11c1) extends to be communicated with the small cavity oil port (11a).
4. The tandem oil cylinder according to claim 3, characterized in that The cylinder body (11) further comprises a second interface part (113) arranged at the rear end of the body part (111), and the large cavity oil port (11b) is opened on the second interface part (113) and extends to be communicated with the rodless cavity.
5. The tandem oil cylinder of claim 1, wherein, The piston rod (12) comprises a piston part (121) and a rod body part (122), and when the piston rod (12) extends to the preset stroke, the rear end face of the piston part (121) is radially aligned with the rear end oil port.
6. The tandem oil cylinder of claim 5, wherein, The limit extension stroke of the piston rod (12) is equal to or greater than the preset stroke.
7. The tandem oil cylinder according to any one of claims 1 to 6, characterized in that The oil cylinder further comprises a guide body (13), the guide body (13) is arranged in the cylinder body (11) and located at the front end of the cylinder body (11), the piston rod (12) is slidably arranged in the cylinder body (11), and the rod body part (122) of the cylinder body (11) penetrates forward from the guide body (13).
8. The tandem oil cylinder according to any one of claims 1 to 6, characterized in that A seal (14) is provided between the piston rod (12) and the inner wall of the cylinder (11).
9. A multi-oil-cylinder tandem module characterized by comprising: Comprising: A primary oil cylinder (1) for series connection according to any one of claims 1 to 8; And A secondary oil cylinder (2) whose rodless cavity inlet and outlet port (21) is connected with the small cavity oil port (11a) of the primary oil cylinder (1), and the secondary oil cylinder (2) is further provided with a rod cavity inlet and outlet port (22).
10. A work machine characterized by, Comprising a multi-oil cylinder series connection module according to claim 9.