Mining sealing jack
By incorporating a limiting groove, a buffer collar, and a threaded sealing assembly into the hydraulic jack, the problem of poor sealing performance was solved, resulting in a significant improvement in sealing performance, stable equipment operation, extended service life, and reduced operating costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG QUZHOU JUSHENG COAL MINING MACHINERY
- Filing Date
- 2025-06-27
- Publication Date
- 2026-05-19
AI Technical Summary
Existing hydraulic jacks have poor sealing performance in their sealing structure design, which leads to hydraulic oil leakage, insufficient system pressure, and affects the stability and reliability of the equipment. At the same time, excessive tightening of the seals will increase friction, causing jamming and wear, and shortening the equipment life.
A sealing assembly comprising a first sealing structure and a second sealing structure is adopted to provide targeted sealing at the contact points between the piston head and the inner wall of the cylinder, and between the cylinder and the piston rod. The sealing effect is enhanced by the use of limiting grooves, buffer collars and threaded connections, and the sealing performance between the cylinder and the piston rod is improved by the use of double sealing rings.
It significantly improves sealing performance, avoids insufficient working pressure and slow control action caused by seal failure, ensures stable output of jack support force, reduces operating costs and component wear, and improves the stability and reliability of equipment in mining operations.
Smart Images
Figure CN224258161U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of jack technology, and particularly relates to a sealing jack for mining. Background Technology
[0002] In mining and related engineering fields, jacks are widely used as important support and lifting equipment. Currently, jacks using plungers or hydraulic cylinders as rigid lifting components have become the mainstream choice in the industry due to their compact structure, stable operation, large lifting force, and self-locking capability. Their working principle is based on hydraulic transmission, converting pressure energy into mechanical energy through a hydraulic system to achieve stable lifting functionality.
[0003] However, existing hydraulic jacks have several problems in their sealing structure design, particularly in the sealing process between the cylinder wall and the piston. Poor sealing performance easily leads to hydraulic oil leakage during operation, causing the system working pressure to fail to meet actual engineering requirements. This results in sluggish jack control actions or even malfunctions, severely impacting the normal operation of the equipment and the efficiency of engineering work. Furthermore, excessively tightening the seals to improve the sealing effect significantly increases the friction between the piston and the cylinder wall, increasing resistance during jack operation and causing problems such as jamming and irregular operation. This not only reduces the reliability of the equipment but also accelerates the wear of seals and related components, shortens the jack's service life, increases maintenance costs, and raises safety hazards. Therefore, improvements are needed. Utility Model Content
[0004] The purpose of this application is to provide a mine-use sealing jack that can solve the above-mentioned problems.
[0005] The purpose of this application is to provide a mine-use sealed jack, comprising:
[0006] The cylinder is cylindrical, and its surface is provided with an oil inlet and an oil outlet;
[0007] The piston rod is located inside the cylinder.
[0008] The piston head is located inside the cylinder and connected to the piston rod, and its outer circumferential surface slides and seals with the inner wall of the hydraulic cylinder.
[0009] The sealing assembly includes a first sealing junction disposed on the piston head and in contact with the inner wall of the cylinder, and a second sealing structure disposed at one end of the cylinder and in contact with the piston rod.
[0010] The second sealing structure is provided with a guide hole through which the piston rod passes, and the piston rod and the guide hole are in a sealing sliding fit.
[0011] The aforementioned sealing jack for mining utilizes a sealing assembly comprising a first sealing structure and a second sealing structure to specifically seal the contact points between the piston head and the inner wall of the cylinder, and between the cylinder and the piston rod. Compared to existing technologies where poor sealing leads to insufficient pressure and slow operation, this significantly improves overall sealing performance, effectively preventing insufficient working pressure due to seal failure. This ensures the jack can continuously and stably output supporting force, avoids slow or even malfunctioning control actions, and enhances the stability of the equipment during mining operations.
[0012] Furthermore, the first sealing structure includes:
[0013] The limiting groove is annular and located on the outer wall of the piston head;
[0014] A buffer collar is provided within the limiting groove;
[0015] Deformation groove, provided inside the annular collar;
[0016] The deformation groove is set at an angle.
[0017] In the first sealing structure, the annular limiting groove provides installation positioning for the buffer ring, preventing it from shifting or falling off during piston head movement. The inclined deformation groove gives the buffer ring self-adaptive capability. When the piston head reciprocates within the cylinder, the inclination angle of the deformation groove causes the buffer ring to elastically deform, allowing it to tightly conform to the unevenness of the cylinder inner wall. This not only significantly enhances the sealing effect but also absorbs vibrations and impacts generated by piston movement through deformation, reducing operating noise and extending the service life of components such as the piston head and cylinder.
[0018] Furthermore, multiple deformation grooves are provided, and adjacent deformation grooves are oriented in opposite directions.
[0019] During piston rod extension, the deformation groove causes the buffer ring to deform to one side, tightly fitting the inner wall of the cylinder. When the piston rod retracts, the deformation groove in the other direction comes into play, ensuring consistent sealing performance. This solves the problems of poor sealing performance and easy leakage in existing technologies with unidirectional motion. Regardless of the jack's operating state, it can maintain stable system pressure, balance the force on the buffer ring, effectively avoid premature local wear, and extend the replacement cycle of seals.
[0020] Furthermore, the second sealing structure includes a seat and an extension head. The seat is disposed at one end of the fixed cylinder, the extension head has an external thread on its outer side, and the cylinder body has an internal thread adapted to it.
[0021] The second sealing structure uses an extension head with external threads that mates with the internal threads of the cylinder body. Compared to the inconvenience of installation and disassembly in existing sealing structures, the threaded connection makes installation and disassembly much easier. Operators can quickly remove the extension head using only simple tools, without the need for complex disassembly of the entire device. This shortens equipment maintenance time and reduces operating costs. Furthermore, the threaded connection offers excellent repeatability, maintaining connection strength and sealing effect even after multiple disassemblies, ensuring the long-term stable operation and use of the jack.
[0022] Furthermore, a first sealing ring is also provided on the outer wall of the extension head.
[0023] During jack operation, hydraulic oil pressure may exert lateral thrust on the connection points. The first sealing ring effectively resists this pressure, preventing hydraulic oil leakage from the threaded connection gaps. This improves the integrity of the overall sealing system, avoiding system pressure drops due to localized leakage and ensuring the continuity and stability of the jack's operation. Simultaneously, the first sealing ring also provides some shock absorption, reducing vibration transmission between the extension head and the cylinder body, and minimizing component wear.
[0024] Furthermore, a limiting reinforcing ring is provided on the inner wall of the piston head, and a matching reinforcing ring groove is provided on the outer wall of the piston rod.
[0025] The limiting reinforcing ring on the inner wall of the piston head is fitted and connected to the reinforcing ring groove on the outer wall of the piston rod, enhancing the connection stability between the piston head and the piston rod. This prevents relative displacement between the two during jack operation, ensuring the movement accuracy of the piston head within the cylinder and guaranteeing the sealing effect of the first sealing structure, thus preventing seal failure due to loose connection. Simultaneously, when the jack is subjected to enormous supporting force or frequent reciprocating motion, it can also effectively limit the relative displacement between the piston head and the piston rod, improving the overall structural rigidity of the jack.
[0026] Furthermore, the second sealing structure also includes a second sealing ring and a third sealing ring disposed on the inner wall of the extension head, and two corresponding slots are provided on the inner wall of the extension head.
[0027] The second and third sealing rings installed on the inner wall of the extension head fit against the piston rod, forming a double sealing barrier. This effectively improves the sealing effect between the cylinder and the piston rod, preventing hydraulic oil leakage along the piston rod. Simultaneously, when the piston rod is subjected to external impact or rapid movement, the frictional force generated by the sealing rings can absorb some of the kinetic energy, acting as a buffer and reducing the impact force of the piston rod on the sealing structure, thus reducing the risk of wear and damage to the seals.
[0028] The beneficial effects of this application are:
[0029] 1. By setting a sealing assembly that includes a first sealing structure and a second sealing structure, the overall sealing performance can be significantly improved, effectively avoiding insufficient working pressure due to sealing failure, enabling the jack to continuously and stably output the supporting force, avoiding slow or even malfunctioning control actions, and improving the stability of the equipment in mining operations.
[0030] 2. The second sealing structure adopts a threaded connection, which makes the installation and disassembly of the sealing structure more convenient. Operators only need to use simple tools to quickly disassemble the extension head without the need for complex disassembly of the entire device.
[0031] 3. The second and third sealing rings installed on the inner wall of the extension head fit against the piston rod, forming a double sealing barrier, which effectively improves the sealing effect between the cylinder and the piston rod and prevents hydraulic oil from leaking along the piston rod. Attached Figure Description
[0032] Figure 1 This is a schematic diagram of the structure of this utility model;
[0033] Figure 2 This is a schematic diagram of the connection between the piston rod and the piston head of this utility model;
[0034] Figure 3 yes Figure 2 A magnified view of A in the middle.
[0035] The reference numerals in the figure are as follows: 100, cylinder block; 110, oil inlet; 120, oil outlet; 200, piston rod; 300, piston head; 310, limiting reinforcing ring; 320, reinforcing ring groove; 400, first sealing joint; 410, limiting groove; 420, buffer collar; 430, deformation groove; 500, second sealing structure; 510, guide hole; 520, seat; 530, extension head; 531, first sealing ring; 540, second sealing ring; 550, third sealing ring. Detailed Implementation
[0036] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.
[0037] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.
[0038] The mining sealing jack provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.
[0039] Example 1:
[0040] like Figures 1 to 3 As shown, this application provides a mine-use sealing jack, comprising:
[0041] The cylinder body 100 is cylindrical, and its surface is provided with an oil inlet 110 and an oil outlet 120;
[0042] Piston rod 200 is disposed inside cylinder body 100;
[0043] The piston head 300 is located inside the cylinder body 100 and connected to the piston rod 200. Its outer circumferential surface is in sliding sealing fit with the inner wall of the hydraulic cylinder.
[0044] The sealing assembly includes a first sealing junction 400 disposed on the piston head 300 and in contact with the inner wall of the cylinder 100, and a second sealing structure 500 disposed at one end of the cylinder 100 and in contact with the piston rod 200.
[0045] The second sealing structure 500 is provided with a guide hole 510 through which the piston rod 200 passes, and the piston rod 200 and the guide hole 510 are in a sealing sliding fit.
[0046] In some embodiments of this application, such as Figure 1 As shown, the aforementioned sealing jack for mining uses a sealing assembly comprising a first sealing structure 400 and a second sealing structure 500 to specifically seal the contact points between the piston head 300 and the inner wall of the cylinder 100, and between the cylinder 100 and the piston rod 200. Compared to existing technologies where poor sealing leads to insufficient pressure and slow operation, this significantly improves overall sealing performance, effectively preventing insufficient working pressure due to seal failure. This ensures the jack can continuously and stably output supporting force, avoids slow or even malfunctioning control actions, and enhances the stability of the equipment during mining operations.
[0047] Example 2:
[0048] This application provides a mine sealing jack, which, in addition to the above-mentioned technical features, also includes the following technical features.
[0049] like Figures 1 to 3 As shown, the first sealing structure 400 includes:
[0050] The limiting groove 410 is annular and is disposed on the outer wall of the piston head 300;
[0051] The buffer collar 420 is disposed within the limiting groove 410;
[0052] Deformation groove 430 is provided inside the annular collar;
[0053] The deformation groove 430 is set at an angle.
[0054] In this embodiment, in the first sealing structure 400, the annular limiting groove 410 provides installation positioning for the buffer ring 420, preventing it from shifting or falling off during the movement of the piston head 300. The inclined deformation groove 430 enables the buffer ring 420 to have self-adaptive capabilities. When the piston head 300 reciprocates within the cylinder 100, the inclination angle of the deformation groove 430 causes the buffer ring 420 to undergo elastic deformation, allowing it to tightly conform to the unevenness of the inner wall of the cylinder 100. This not only significantly enhances the sealing effect but also absorbs the vibration and impact generated by the piston movement through deformation, reducing movement noise and extending the service life of components such as the piston head 300 and the cylinder 100.
[0055] Furthermore, multiple deformation grooves 430 are provided, and adjacent deformation grooves 430 are oriented in opposite directions.
[0056] During the extension of the piston rod 200, the deformation groove 430 causes the buffer ring 420 to be squeezed and deformed to one side, tightly fitting the inner wall of the cylinder 100. When the piston rod 200 retracts, the deformation groove 430 in the other direction comes into play, ensuring a consistent sealing effect. This solves the problems of poor sealing effect and easy leakage in the existing technology due to unidirectional movement. Regardless of the working state of the jack, it can maintain stable system pressure, balance the force on the buffer ring 420, effectively avoid premature local wear, and extend the replacement cycle of the seals.
[0057] Example 3:
[0058] This application provides a mine sealing jack, which, in addition to the above-mentioned technical features, also includes the following technical features.
[0059] like Figure 1As shown, the second sealing structure 500 includes a seat 520 and an extension head 530. The seat 520 is disposed at one end of the fixed cylinder, and the extension head 530 has an external thread on its outer side. The cylinder body 100 has an internal thread that is adapted to it.
[0060] In this embodiment, the second sealing structure 500 uses an extension head 530 with external threads to engage with the internal threads of the cylinder body 100. Compared to the inconvenience of installing and disassembling sealing structures in the prior art, the threaded connection makes the installation and disassembly of the sealing structure more convenient. Operators only need simple tools to quickly disassemble the extension head 530 without the need for complex disassembly of the entire device. This shortens equipment maintenance time and reduces operating costs. At the same time, the threaded connection has good repeatability, maintaining connection strength and sealing effect even after multiple disassemblies, ensuring the long-term stable operation and use of the jack.
[0061] Example 4:
[0062] This application provides a mine sealing jack, which, in addition to the above-mentioned technical features, also includes the following technical features.
[0063] like Figure 1 As shown, a first sealing ring 531 is also provided on the outer wall of the extension head 530.
[0064] In this embodiment, during the operation of the jack, the hydraulic oil pressure may exert a lateral thrust on the connection. The first sealing ring 531 can effectively resist this pressure and prevent hydraulic oil from leaking from the threaded connection gap. This improves the integrity of the overall sealing system, avoids system pressure drop due to local leakage, and ensures the continuity and stability of the jack's operation. At the same time, the first sealing ring 531 also plays a certain role in shock absorption, reducing vibration transmission between the extension head 530 and the cylinder body 100, and reducing component wear.
[0065] Furthermore, the second sealing structure 500 also includes a second sealing ring 540 and a third sealing ring 550 disposed on the inner wall of the extension head 530, and two corresponding slots are provided on the inner wall of the extension head 530.
[0066] The second sealing ring 540 and the third sealing ring 550 installed on the inner wall of the extension head 530 fit against the piston rod 200, forming a double sealing barrier. This effectively improves the sealing effect between the cylinder body 100 and the piston rod 200, preventing hydraulic oil leakage along the piston rod 200. Simultaneously, when the piston rod 200 is subjected to external impact or rapid movement, the frictional force generated by the sealing rings can absorb some of the kinetic energy, acting as a buffer and reducing the impact force of the piston rod 200 on the sealing structure, thus reducing the risk of wear and damage to the seals.
[0067] Example 5:
[0068] This application provides a mine sealing jack, which, in addition to the above-mentioned technical features, also includes the following technical features.
[0069] like Figure 1 and Figure 2 As shown, a limiting reinforcing ring 310 is provided on the inner wall of the piston head 300, and a matching reinforcing ring groove 320 is provided on the outer wall of the piston rod 200.
[0070] In this embodiment, the limiting reinforcing ring 310 on the inner wall of the piston head 300 is adapted to connect with the reinforcing ring groove 320 on the outer wall of the piston rod 200, enhancing the connection stability between the piston head 300 and the piston rod 200, preventing relative displacement between the two during jack operation, ensuring the movement accuracy of the piston head 300 within the cylinder 100, guaranteeing the sealing effect of the first sealing structure 400, and preventing seal failure due to loose connection. Simultaneously, when the jack is subjected to enormous supporting force or frequent reciprocating motion, it can also effectively limit the relative displacement between the piston head 300 and the piston rod 200, improving the overall structural rigidity of the jack.
[0071] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.
[0072] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.
Claims
1. A sealing jack for mining, characterized in that: include: The cylinder (100) is cylindrical and has an oil inlet (110) and an oil outlet (120) on its surface; The piston rod (200) is disposed inside the cylinder body (100); The piston head (300) is located inside the cylinder body (100) and connected to the piston rod (200), and its outer circumferential surface is in sliding sealing fit with the inner wall of the hydraulic cylinder; The sealing assembly includes a first sealing junction (400) disposed on the piston head (300) and in contact with the inner wall of the cylinder (100) and a second sealing structure (500) disposed at one end of the cylinder (100) and in contact with the piston rod (200); The second sealing structure (500) is provided with a guide hole (510) through which the piston rod (200) passes, and the piston rod (200) and the guide hole (510) are in a sealing sliding fit.
2. The mine sealing jack according to claim 1, characterized in that: The first sealing structure (400) includes: The limiting groove (410) is annular and is disposed on the outer wall of the piston head (300); A buffer collar (420) is disposed within a limiting groove (410); Deformation groove (430) is provided inside the annular collar; The deformation groove (430) is set at an angle.
3. A mine-use sealed jack according to claim 2, characterized in that: Multiple deformation grooves (430) are provided, and adjacent deformation grooves (430) are oriented in opposite directions.
4. A mine-use sealed jack according to claim 3, characterized in that: The second sealing structure (500) includes a seat (520) and an extension head (530). The seat (520) is located at one end of the fixed cylinder. The extension head (530) has an external thread on its outer side, and the cylinder body (100) has an internal thread that is adapted to it.
5. A mine-use sealed jack according to claim 4, characterized in that: A first sealing ring (531) is also provided on the outer wall of the extension head (530).
6. A mine-use sealed jack according to claim 2, characterized in that: The piston head (300) is provided with a limiting reinforcing ring (310) on its inner wall, and the piston rod (200) is provided with a matching reinforcing ring groove (320) on its outer wall.
7. A mine-use sealed jack according to claim 5, characterized in that: The second sealing structure (500) further includes a second sealing ring (540) and a third sealing ring (550) disposed on the inner wall of the extension head (530), and two slots corresponding to the two are disposed on the inner wall of the extension head (530).