Hydraulic oil cylinder for hydraulic machine

Abstract

The utility model relates to a hydraulic oil cylinder for a hydraulic machine. The hydraulic oil cylinder is provided with an oil cylinder body with the upper end communicated with the outside and a piston rod arranged in the oil cylinder body in a sliding mode. A bearing block is arranged at the upper end of the interior of the oil cylinder body, the interior of the oil cylinder body is divided into a sealed space and a hydraulic space by the bearing block, a sealing piece is arranged in the sealed space, a sealing block used for sealing the upper end of the oil cylinder body is further detachably and fixedly arranged at the upper end of the oil cylinder body, and a guide block is arranged on the sealing block. The bottom of the sealing block is fixedly connected with an extrusion block used for extruding the sealing piece through an elastic piece, a guide groove is formed in the upper end of the oil cylinder body, an annular groove is formed in the inner wall of the sealing space, and a limiting groove is formed in the upper end of the annular groove. According to the oil cylinder, the sealing ring can be rapidly installed, the oil cylinder is convenient to disassemble and maintain, and the oil cylinder is efficient and rapid.

Description

Technical Field

[0001] The utility model relates to a hydraulic cylinder for a hydraulic press. Background Art

[0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and is widely used in various fields such as machinery, engineering, and agriculture. The structure of a hydraulic cylinder mainly consists of a cylinder body, a piston, a cylinder rod, and seals. Its interior is divided into two parts by the piston, and the hydraulic fluid flows through oil holes.

[0003] The sealing of a hydraulic cylinder is a crucial part of a hydraulic system, and its performance directly affects the performance and service life of the hydraulic system. The main purpose of the sealing of a hydraulic cylinder is to prevent the leakage of hydraulic oil and the entry of external contaminants, thereby ensuring the normal operation of the system and extending the service life of the equipment; in the existing installation and enclosure, it is necessary to embed the enclosure component into the interior of the cylinder and then fix the enclosure component through fixing parts such as bolts, and multiple fixing parts are used during the fixing process; during this process, when internal problems occur in the cylinder body, it is time-consuming and laborious and the steps are troublesome during the disassembly process of the enclosure component. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a hydraulic cylinder for a hydraulic press, which can quickly install the sealing ring, is convenient for disassembly and maintenance, and is efficient and fast.

[0005] The technical solution for achieving the purpose of the utility model is: The utility model has a cylinder body with an upper end communicating with the outside and a piston rod slidably arranged inside the cylinder body; a supporting block is arranged at the upper end inside the cylinder body, and the interior of the cylinder body is divided into a sealing space and a hydraulic space by the supporting block. The supporting block is provided with a seal on one side located in the sealing space. Both the supporting block and the seal are hollowly arranged, and the hollow part can form a sliding fit with the outer wall of the piston rod. The upper end of the cylinder body is also detachably and fixedly provided with a closing block for closing the upper end of the cylinder body. The seal is located between the closing block and the supporting block;

[0006] Guide blocks are symmetrically arranged on both sides of the closing block. The bottom of the closing block is fixedly connected with a pressing block for pressing the seal through an elastic member. One end of the elastic member is fixedly arranged on the closing block, and the other end of the elastic member is fixedly arranged on the pressing block. Guide grooves communicating with the outside and extending into the sealing space and allowing the guide blocks to pass through are symmetrically arranged at the upper end of the cylinder body. A ring groove communicating with the guide grooves and allowing the guide blocks to slide therein is arranged on the inner wall of the sealing space. A limiting groove for allowing the guide blocks to be snapped into the interior under the elastic force of the elastic member to form a limiting fit is arranged at the upper part of the ring groove far from the guide grooves; The closing block is detachably and fixedly arranged at the upper end of the cylinder body under the elastic force of the elastic member and the limiting fit between the guide blocks and the limiting groove.

[0007] Further, the seal includes a rubber ring, a first elastic piece and a second elastic piece symmetrically arranged on the outer wall of the rubber ring up and down. The first elastic piece and the second elastic piece both include an extrusion part with a convex middle and concave sides on both sides and a flanging part with one end turned outwards towards the outside. One end of the extrusion part is fixedly arranged on the outer wall of the rubber ring, and the other end of the flanging part is fixedly arranged on the other end of the extrusion part. An embedding groove for the end of the flanging part turned outwards towards the outside to be embedded is arranged on the side wall of the sealing space.

[0008] Further, a partition block extending towards the space between the first elastic piece and the second elastic piece is fixedly arranged inside the embedding groove. The inside of the embedding groove is divided into a first guide groove and a second guide groove by the partition block. The partition block is provided with a guiding surface for guiding the flanging parts on the first elastic piece and the second elastic piece into the first guide groove and the second guide groove respectively.

[0009] Further, a plurality of concentric friction fins are arranged on the flanging parts of the first elastic piece and the second elastic piece. The friction fins on the flanging parts of the first elastic piece and the second elastic piece respectively act on the inner walls of the first guide groove and the second guide groove.

[0010] Further, elastic plates arranged along the extending directions of the extrusion part and the flanging part and connecting the extrusion part and the flanging part are arranged inside the first elastic piece and the second elastic piece.

[0011] Further, a limiting plate for preventing the elastic plate from being excessively deformed is also arranged between the first elastic piece and the second elastic piece. One end of the limiting plate is fixedly arranged on the rubber ring, and the other end of the limiting plate extends towards the junction of the first elastic piece and the second elastic piece.

[0012] Further, a handle for taking out or inserting the closing block is fixedly arranged on the closing block.

[0013] The utility model has positive effects: (1) The closing block of the utility model is detachably and fixedly arranged at the upper end of the oil cylinder body under the elastic force of the elastic member and the limiting cooperation between the guiding block and the limiting groove; through the action of the elastic member on the closing block, the guiding block and the limiting groove form a limiting cooperation, so as to fix the closing block at the upper end of the oil cylinder body. When it is necessary to remove the closing block, only by separating the guiding block and the limiting groove from the limiting cooperation and then sliding the guiding block out of the guiding groove, the installation of the sealing ring can be carried out quickly, which is convenient for disassembly and maintenance, and is efficient and convenient.

[0014] (2) The sealing member of the present utility model includes a rubber ring, a first elastic sheet and a second elastic sheet symmetrically arranged on the outer wall of the rubber ring up and down. Under the extrusion of the extrusion block, the extrusion parts of the first elastic sheet and the second elastic sheet cause the flanging parts to enter the first guide groove and the second guide groove of the embedding groove along the guiding surface of the separating block. After being extruded by the extrusion block, the flanging parts fill the embedding groove, fixing the sealing member inside the oil cylinder body and enhancing the sealing effect.

[0015] (3) The flanging parts of the first elastic sheet and the second elastic sheet of the present utility model are provided with a plurality of friction fins arranged concentrically. The friction fins on the flanging parts of the first elastic sheet and the second elastic sheet act on the inner walls of the first guide groove and the second guide groove respectively. By arranging a plurality of friction fins, the friction between the flanging parts and the embedding groove is increased, further enhancing the sealing effect and restricting the hydraulic oil inside the oil cylinder body within the sealed space.

[0016] (4) Inside the first elastic sheet and the second elastic sheet of the present utility model, elastic plates are respectively arranged along the extending directions of the extrusion parts and the flanging parts and connecting the extrusion parts and the flanging parts. The elastic plates can enable the extrusion parts to have a better flipping effect after receiving the extrusion block.

[0017] (5) A limiting plate is further arranged between the first elastic sheet and the second elastic sheet of the present utility model. One end of the limiting plate is fixedly arranged on the rubber ring, and the other end of the limiting plate extends towards the junction of the first elastic sheet and the second elastic sheet. The limiting plate can prevent the elastic plates from being excessively deformed and prolong the service life of the sealing member.

[0018] (6) A handle is fixedly arranged on the closing block of the present utility model, which is convenient for taking out or inserting the closing block from the upper end of the oil cylinder body, facilitating the operation. Description of the Drawings

[0019] In order to make the content of the present utility model be more clearly understood, the following further elaborates on the present utility model in detail according to specific embodiments in conjunction with the drawings, where

[0020] Figure 1 is the overall structure sectional view of the present utility model;

[0021] Figure 2 is Figure 1 the partial enlarged view of A in

[0022] Figure 3 is the sectional view of the sealing member of the present utility model;

[0023] Figure 4 is the structural schematic diagram of the oil cylinder body of the present utility model;

[0024] Figure 5 is the structural schematic diagram of the closing member of the present utility model. Detailed implementation mode

[0025] See Figures 1 to 5 , the utility model has an oil cylinder body 1 with the upper end communicating with the outside and a piston rod 2 slidably arranged in the oil cylinder body 1; a supporting block 1-1 is arranged at the upper end inside the oil cylinder body 1, and the inside of the oil cylinder body 1 is divided into a sealing space 11 and a hydraulic space 12 by the supporting block 1-1. A sealing member 3 is arranged on one side of the supporting block 1-1 in the sealing space 11. The supporting block 1-1 and the sealing member 3 are both hollowly arranged, and the hollow parts can form a sliding fit with the outer wall of the piston rod 2. The upper end of the oil cylinder body 1 is also detachably and fixedly provided with a closing block 4 for closing the upper end of the oil cylinder body 1. The sealing member 3 is located between the closing block 4 and the supporting block 1-1;

[0026] Guiding blocks 41 are symmetrically arranged on both sides of the closing block 4. A pressing block for pressing the sealing member 3 is fixedly connected to the bottom of the closing block 4 through an elastic member 5. One end of the elastic member 5 is fixedly arranged on the closing block 4, and the other end of the elastic member 5 is fixedly arranged on the pressing block. Guiding grooves 13 communicating with the outside and extending into the sealing space 11 and allowing the guiding blocks 41 to pass through are symmetrically arranged at the upper end of the oil cylinder body 1. An annular groove 14 communicating with the guiding grooves 13 and allowing the guiding blocks 41 to slide therein is arranged on the inner wall of the sealing space 11. A limiting groove for the guiding blocks 41 to be snapped into the inside under the elastic force of the elastic member 5 to form a limiting fit is arranged at the part of the upper end of the annular groove 14 far from the guiding grooves 13; the closing block 4 is detachably and fixedly arranged at the upper end of the oil cylinder body 1 under the elastic force of the elastic member 5 and the limiting fit between the guiding blocks 41 and the limiting groove.

[0027] The above-mentioned closing block 4 can be inserted into the opening at the upper end of the oil cylinder body 1, and the elastic member 5 can be a return spring.

[0028] Through the action of the elastic member 5 on the closing block 4, the guiding blocks 41 and the limiting groove form a limiting fit, so as to fix the closing block 4 at the upper end of the oil cylinder body 1. When it is necessary to remove the closing block 4, only the guiding blocks 41 and the limiting groove need to be disengaged from the limiting fit, and then the guiding blocks 41 are slid out of the guiding grooves 13, which is more efficient and convenient; at the same time, the operation is convenient and easy to operate.

[0029] The sealing member 3 includes a rubber ring 31, a first elastic sheet 32 and a second elastic sheet 33 symmetrically arranged on the outer wall of the rubber ring 31 up and down. The first elastic sheet 32 and the second elastic sheet 33 both include a pressing part 6 with the middle protruding outwards and both sides sunken inwards and a flanging part 7 with one end turned outwards towards the outside. One end of the pressing part 6 is fixedly arranged on the outer wall of the rubber ring 31, and the other end of the flanging part 7 is fixedly arranged on the other end of the pressing part 6. An embedding groove 111 for the end of the flanging part 7 turned outwards towards the outside to be embedded is arranged on the side wall of the sealing space 11.

[0030] The sealing member 3 is also made of nitrile rubber (NBR), fluororubber (FKM), polyurethane (PU), polytetrafluoroethylene (PTFE), etc.

[0031] Inside the slot 111, a partition block 112 is fixedly arranged with one end extending towards the space between the first elastic piece 32 and the second elastic piece 33. The inside of the slot 111 is divided by the partition block 112 into a first guide groove 1111 and a second guide groove 1112. On the partition block 112, there is a guiding surface 1121 for guiding the flanging parts 7 on the first elastic piece 32 and the second elastic piece 33 into the first guide groove 1111 and the second guide groove 1112 respectively.

[0032] The first guide groove 1111 and the second guide groove 1112 respectively bend and extend towards the upper end and the lower end of the oil cylinder body 1. The cross-sections of the first guide groove 1111 and the second guide groove 1112 are curved. After the flanging parts 7 of the first elastic piece 32 and the second elastic piece 33 are extruded by the extrusion block at the extrusion part 6, they can extend along the extending directions of the first guide groove 1111 and the second guide groove 1112 respectively.

[0033] On the flanging parts 7 of the first elastic piece 32 and the second elastic piece 33, there are a plurality of friction fins 71 arranged concentrically. The friction fins 71 on the flanging parts 7 of the first elastic piece 32 and the second elastic piece 33 respectively act on the inner walls of the first guide groove 1111 and the second guide groove 1112. Through the arrangement of the plurality of friction fins 71, the friction between the flanging part 7 and the slot 111 is increased, and the sealing effect is further enhanced, restricting the hydraulic oil inside the oil cylinder body 1 within the sealing space 11.

[0034] Inside the first elastic piece 32 and the second elastic piece 33, there are elastic plates 8 arranged along the extending directions of the extrusion part 6 and the flanging part 7 and connecting the extrusion part 6 and the flanging part 7. The elastic plates 8 can make the turning effect of the flanging part 7 better when the extrusion part 6 is extruded by the extrusion block.

[0035] Between the first elastic piece 32 and the second elastic piece 33, there is also a limiting plate 9 for preventing the elastic plate 8 from being excessively deformed. One end of the limiting plate 9 is fixedly arranged on the rubber ring 31, and the other end of the limiting plate 9 extends towards the junction of the first elastic piece 32 and the second elastic piece 33. The limiting plate 9 can extend the service life of the sealing member 3.

[0036] On the closing block 4, a handle 42 for taking out or inserting the closing block 4 is fixedly arranged.

[0037] Working principle of the present utility model: The piston rod 2 is slidably arranged inside the oil cylinder body 1. A sealing member 3 is placed on the supporting block 1-1. The guiding block 41 on the closing block 4 is inserted into the guiding groove 13 on the oil cylinder body 1. The guiding block 41 enters the annular groove 14. At this time, the pressing block on the closing block 4 presses the sealing member 3. The closing block 4 is rotated through the handle 42 on the closing block 4, so that the guiding block 41 slides in the annular groove 14. When the guiding block 41 slides to the position where the limiting groove is located, the closing block 4 drives the guiding block 41 to be embedded in the limiting groove under the action of the elastic member 5, completing the installation of the closing block 4; when disassembling, by pressing the handle 42, the guiding block 41 is disengaged from the limiting fit with the limiting groove, and then the closing block 4 is rotated until the guiding block 41 corresponds to the guiding groove 13, and the closing block 4 is taken out of the oil cylinder body 1 through the sliding of the guiding block 41 and the guiding groove 13.

[0038] In the specific embodiments described above, the purpose, technical solutions and beneficial effects of the present utility model have been further elaborated in detail. It should be understood that the above are only specific embodiments of the present utility model and are not used to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A hydraulic cylinder for a hydraulic press, comprising a cylinder body (1) whose upper end is connected to the outside and a piston rod (2) slidably arranged in the cylinder body (1); characterized in that: A support block (1-1) is provided at the upper end of the interior of the oil cylinder body (1), and the interior of the oil cylinder body (1) is divided into a sealed space (11) and a hydraulic space (12) by the support block (1-1). A sealing member (3) is provided on one side of the sealed space (11). Both the support block (1-1) and the sealing member (3) are hollow and the hollow portion can form a sliding fit with the outer wall of the piston rod (2). A closing block (4) for closing the upper end of the oil cylinder body (1) can also be detachably fixedly provided at the upper end of the oil cylinder body (1), and the sealing member (3) is located between the closing block (4) and the support block (1-1); The closing block (4) is symmetrically provided with guide blocks (41) on both sides; the bottom of the closing block (4) is fixedly connected to an extrusion block for extruding the sealing member (3) via an elastic member (5); one end of the elastic member (5) is fixedly provided on the closing block (4); the other end of the elastic member (5) is fixedly provided on the extrusion block; the upper end of the oil cylinder body (1) is symmetrically provided with guide grooves (13) which are communicated with the outside and extend into the sealing space (11) and can allow the guide blocks (41) to pass through; the sealing space The inner wall of the cylinder body (11) is provided with an annular groove (14) which is in communication with the guide groove (13) and in which the guide block (41) can slide; the upper end of the annular groove (14) away from the guide groove (13) is provided with a limiting groove in which the guide block (41) can be inserted under the elastic force of the elastic member (5) to form a limiting fit; the closing block (4) is detachably fixedly arranged on the upper end of the cylinder body (1) under the elastic force of the elastic member (5) and the limiting fit of the guide block (41) and the limiting groove.

2. A hydraulic cylinder for a hydraulic press according to claim 1, characterized in that: The sealing member (3) comprises a rubber ring (31), a first elastic sheet (32) and a second elastic sheet (33) symmetrically fixedly arranged on the outer wall of the rubber ring (31) in an upper and lower manner, the first elastic sheet (32) and the second elastic sheet (33) both comprising an extrusion portion (6) convex in the middle and concave at both sides, and a flange portion (7) with one end turned outward, one end of the extrusion portion (6) being fixedly arranged on the outer wall of the rubber ring (31), the other end of the flange portion (7) being fixedly arranged on the other end of the extrusion portion (6), and a side wall of the sealing space (11) being provided with an embedding groove (111) for embedding the end of the flange portion (7) turned outward.

3. A hydraulic cylinder for a hydraulic press according to claim 2, characterized in that: A partition block (112) is fixedly provided inside the embedded groove (111) with one end extending toward between the first elastic sheet (32) and the second elastic sheet (33); the interior of the embedded groove (111) is divided into a first guide groove (1111) and a second guide groove (1112) by the partition block (112); and a guide surface (1121) is provided on the partition block (112) for guiding the flanged edge portions (7) on the first elastic sheet (32) and the second elastic sheet (33) to enter the first guide groove (1111) and the second guide groove (1112) respectively.

4. A hydraulic cylinder for a hydraulic press according to claim 3, characterized in that: A plurality of concentrically arranged friction fins (71) are provided on the flanged portions (7) on the first elastic sheet (32) and the second elastic sheet (33); the friction fins (71) on the flanged portions (7) on the first elastic sheet (32) and the second elastic sheet (33) act on the inner walls of the first guide groove (1111) and the second guide groove (1112), respectively.

5. The hydraulic cylinder for a hydraulic press according to claim 2, characterized in that: The first elastic sheet (32) and the second elastic sheet (33) are both provided with elastic plates (8) arranged along the extension direction of the extrusion portion (6) and the flange portion (7) and connecting the extrusion portion (6) and the flange portion (7).

6. The hydraulic cylinder for a hydraulic press according to claim 5, characterized in that: A limiting plate (9) for preventing the elastic plate (8) from excessive deformation is also provided between the first elastic plate (32) and the second elastic plate (33); one end of the limiting plate (9) is fixedly arranged on the rubber ring (31), and the other end of the limiting plate (9) extends toward the junction of the first elastic plate (32) and the second elastic plate (33).

7. The hydraulic cylinder for a hydraulic press according to claim 1, characterized in that: A handle (42) for removing or inserting the closing block (4) is fixedly provided on the closing block (4).

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