Buffer type hydraulic oil cylinder

Abstract

The utility model relates to a buffer type hydraulic oil cylinder which is provided with a cylinder body, a cylinder cover, a sealing piece, a piston and a piston rod, an inner cavity of the cylinder body is divided into a first chamber and a second chamber by the piston, and a first oil port and a second oil port are formed in the cylinder body; two buffer channels are arranged on the inner wall of the cylinder body, each buffer channel comprises an oil inlet channel, a pass-stop channel, a variable-diameter channel and an oil outlet channel which are communicated in sequence, the oil outlet channel is communicated with the first cavity, an inlet and an outlet are formed in the two ends of the variable-diameter channel respectively, the inlet of the variable-diameter channel is communicated with the pass-stop channel, and the outlet of the variable-diameter channel is communicated with the pass-stop channel. An outlet of the variable-diameter channel is communicated with the oil outlet channel, the caliber of an inlet of the variable-diameter channel is larger than that of the outlet of the variable-diameter channel, a reversing valve capable of controlling the two on-off channels to conduct on-off switching is arranged between the two on-off channels, and oil liquid passes through the buffering channels through switching of the reversing valve and conducts pressure relief buffering on the piston and the piston rod. The device is ingenious in structure, efficient and convenient.

Description

Technical Field

[0001] The utility model relates to the field of hydraulic cylinders, and particularly relates to a buffer type hydraulic cylinder. Background Art

[0002] The working principle of a hydraulic cylinder is based on hydraulic transmission, and power is transmitted through the pressure inside the hydraulic oil. The output force of the hydraulic cylinder is proportional to the effective area of the piston and the pressure difference on both sides thereof. The core components of a hydraulic cylinder include a cylinder barrel, a cylinder head, a piston, a piston rod, a sealing device, a buffer device, and an exhaust device. Among them, the buffer device and the exhaust device depend on specific application scenarios, while the other components are essential components.

[0003] The function of a hydraulic cylinder is to convert hydraulic energy into mechanical energy. It is an energy conversion device that converts hydraulic energy into mechanical energy of reciprocating linear motion. The traditional buffer type hydraulic cylinder can basically meet people's usage requirements, but there are still certain problems. In the prior art, the buffer performance of the hydraulic cylinder is poor, and the excessive pressure of the hydraulic cylinder will greatly affect the service life of the hydraulic cylinder, which is very inconvenient. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a buffer type hydraulic cylinder with a clever structure. By providing buffer channels to relieve pressure and buffer the sliding of the hydraulic cylinder, the safety of the hydraulic cylinder during use is ensured, and it is stable and practical.

[0005] The technical solution for achieving the purpose of the utility model is as follows: The utility model has a cylinder body, a cylinder head installed on the cylinder body, a seal installed between the cylinder body and the cylinder head, a piston slidably arranged in the cylinder body, and a piston rod fixed on the piston and capable of sliding under the drive of the piston. The piston divides the inner cavity of the cylinder body into a first chamber and a second chamber. The cylinder body is provided with a first oil port and a second oil port. The first oil port is communicated with the first chamber, and the second oil port is communicated with the second chamber. Two symmetrically arranged buffer channels for buffering the sliding of the piston are provided on the inner wall of the cylinder body. Each buffer channel is communicated with the inner cavity of the cylinder body. Each buffer channel includes an oil inlet channel, a through-stop channel, a variable-diameter channel, and an oil outlet channel that are sequentially communicated. The oil inlet channel in the first buffer channel is communicated with the first chamber, and the oil outlet channel is communicated with the second chamber. The oil inlet channel of the second buffer channel is communicated with the second chamber, and the oil outlet channel is communicated with the first chamber. The two ends of the variable-diameter channel are respectively provided with an inlet and an outlet. The inlet of the variable-diameter channel is communicated with the through-stop channel, and the outlet of the variable-diameter channel is communicated with the oil outlet channel. The diameter of the inlet of the variable-diameter channel is larger than the diameter of the outlet of the variable-diameter channel. A reversing valve for controlling the on-off switching of the two through-stop channels is provided between the two through-stop channels. Each buffer channel supplies hydraulic fluid through the switching of the reversing valve to relieve pressure and buffer the piston and the piston rod.

[0006] Furthermore, a boss coaxially arranged with the inner cavity of the cylinder block is provided on the cylinder head. A plastic sealing cap is covered on the boss. The sealing cap includes a ring sleeve portion sleeved on the outer wall of the boss and a buffer portion pressed against the end face of the boss. The ring sleeve portion and the buffer portion are integrally formed. After the cylinder head is installed on the cylinder block, the ring sleeve portion is pressed against the inner wall of the cylinder block and forms a seal with the inner wall of the cylinder block.

[0007] Furthermore, a plurality of connecting snap rings coaxially arranged with the ring sleeve portion are provided on the inner wall of the ring sleeve portion. Each connecting snap ring is uniformly distributed on the inner wall of the ring sleeve portion along the extending direction of the axis of the ring sleeve portion. A connecting slot adapted to the connecting snap ring is provided on the outer wall of the boss. The sealing cap is installed on the boss through the snap connection of the connecting snap ring and the connecting slot.

[0008] Furthermore, a hook portion integrally formed with the connecting snap ring is provided at one end of each connecting snap ring away from the inner wall of the ring sleeve portion. A locking hook groove corresponding to the hook portion is provided in the connecting slot. After each connecting snap ring is inserted into the connecting slot, it is fixed in the connecting slot through the cooperation of the hook portion and the locking hook groove.

[0009] Furthermore, a plurality of sealing convex rings are provided on the outer wall of the ring sleeve portion. Each sealing convex ring is uniformly distributed on the outer wall of the ring sleeve portion along the extending direction of the axis of the ring sleeve portion. A sealing groove corresponding to each sealing convex ring is provided on the inner wall of the cylinder block. The cross section of the sealing convex ring is trapezoidal, and the cross section of the sealing groove is also trapezoidal. After the convex block on the cylinder head extends into the cylinder block, the ring sleeve portion is hermetically connected to the inner wall of the cylinder block through the cooperation of each sealing convex ring and the sealing groove.

[0010] Furthermore, buffer pads are provided on both end faces of the piston.

[0011] The utility model has positive effects: (1) By arranging two buffer channels in the cylinder block, arranging a variable-diameter channel in the buffer channel to buffer the oil when it pushes the piston, and using a reversing valve to switch the on-off of the two buffer channels, the utility model can timely and accurately relieve pressure and buffer when the hydraulic cylinder extends or retracts. This effectively solves the problem that the buffer performance of the hydraulic cylinder in the prior art is poor, and the excessive pressure of the hydraulic cylinder greatly affects the service life of the hydraulic cylinder. By arranging each buffer channel to relieve pressure and buffer the hydraulic cylinder, it can not only ensure the normal use of the hydraulic cylinder, but also ensure the safety of the hydraulic cylinder during use and extend the service life of the hydraulic cylinder. The structure is ingenious, efficient and practical.

[0012] (2) By arranging a boss on the cylinder head and a sealing cap on the boss, the utility model can, on the one hand, ensure the stability and firmness of the connection between the cylinder head and the rod body, and on the other hand, ensure the sealing performance of the connection between the cylinder head and the cylinder block through the ring sleeve portion. It is stable and practical.

[0013] (3) The utility model ensures the stability and firmness of the connection between the sealing cap and the boss through the cooperation of the connecting snap ring and the connecting slot on the inner wall of the sleeve part. On the one hand, it guarantees the stability and firmness of the connection between the sealing cap and the boss. On the other hand, after the sealing cap is pressed against the inner wall of the cylinder block, it increases the axial and radial friction forces between the cylinder head and the cylinder block, further ensuring the stability and firmness of the connection between the cylinder head and the cylinder block, which is safe and practical.

[0014] (4) The utility model further ensures the firmness and stability of the connection between the sealing cap and the boss on the cylinder head by setting a hook part on the connecting snap ring and through the cooperation of the hook part and the locking hook slot, avoiding the separation of the sealing cap during installation, use or disassembly, and ensuring the firmness of the connection between the sealing cap and the boss while further ensuring the axial stability between the sealing cap and the inner wall of the cylinder block.

[0015] (5) The utility model sets a sealing convex ring on the outside of the sleeve part and corresponding sealing grooves on the inner wall of the cylinder block, which not only ensures the tightness of the connection between the sealing cap and the inner wall of the cylinder block but also ensures the sealing performance of the connection between the sealing cap and the inner wall of the cylinder block, avoiding leakage between the cylinder head and the cylinder block, and thus ensuring the stability of the hydraulic cylinder during use, which is convenient and practical.

[0016] (6) The utility model further reduces the impact force between the piston and the inner wall of the oil cylinder when the piston slides to the limit position by setting buffer pads on both end faces of the piston, further ensuring the safety of the hydraulic cylinder, which is convenient and practical. Description of the Drawings

[0017] In order to make the content of the utility model easier to be clearly understood, the following further details the utility model according to specific embodiments in conjunction with the drawings, where

[0018] Figure 1 is a cross-sectional view of the overall structure of the buffer type hydraulic cylinder in the utility model;

[0019] Figure 2 is Figure 1 an enlarged view of part C in

[0020] Figure 3 is a cross-sectional view of the overall structure of the two buffer channels on the cylinder block in the utility model;

[0021] Figure 4 is a cross-sectional view of the overall structure of the cylinder head in the utility model;

[0022] Figure 5 is Figure 4 an enlarged view of part A in

[0023] Figure 6It is a cross-sectional view of the overall structure of the sealing cap in the present utility model;

[0024] Figure 7 It is Figure 6 an enlarged view of part B in Specific embodiments

[0025] See Figures 1 to 7 , the present utility model has a cylinder block 1, a cylinder head 2 installed on the cylinder block 1, a sealing member installed between the cylinder block 1 and the cylinder head 2, a piston 3 slidably disposed in the cylinder block 1, and a piston rod 4 fixed on the piston 3 and slidable under the drive of the piston 3. The piston 3 divides the inner cavity of the cylinder block 1 into a first chamber 11 and a second chamber 12. The cylinder block 1 is provided with a first oil port 13 and a second oil port 14. The first oil port 13 is communicated with the first chamber 11, and the second oil port 14 is communicated with the second chamber 12. Two symmetrically arranged buffer channels 7 for buffering the sliding of the piston 3 are provided on the inner wall of the cylinder block 1. Each buffer channel 7 is communicated with the inner cavity of the cylinder block 1. Each buffer channel 7 includes an oil inlet channel 71, a through-stop channel 72, a variable-diameter channel 73 and an oil outlet channel 74 which are sequentially communicated. The oil inlet channel 71 in the first buffer channel 7 is communicated with the first chamber 11, and the oil outlet channel 74 is communicated with the second chamber 12. The oil inlet channel 71 of the second buffer channel 7 is communicated with the second chamber 12, and the oil outlet channel 74 is communicated with the first chamber 11. The two ends of the variable-diameter channel 73 are respectively provided with an inlet and an outlet. The inlet of the variable-diameter channel 73 is communicated with the through-stop channel 72, and the outlet of the variable-diameter channel 73 is communicated with the oil outlet channel 74. The diameter of the inlet of the variable-diameter channel 73 is larger than the diameter of the outlet of the variable-diameter channel 73. A reversing valve 8 for controlling the on-off switching of the two through-stop channels 72 is provided between the two through-stop channels 72. Each buffer channel 7 supplies hydraulic fluid through the switching of the reversing valve 8 to relieve pressure and buffer the piston 3 and the piston rod 4.

[0026] A boss 5 coaxially arranged with the inner cavity of the cylinder block 1 is provided on the cylinder head 2. A plastic sealing cap 6 is covered on the boss 5. The sealing cap 6 includes a ring sleeve portion 61 sleeved on the outer wall of the boss 5 and a buffer portion 62 pressed against the end face of the boss 5. The ring sleeve portion 61 and the buffer portion 62 are integrally formed. After the cylinder head 2 is installed on the cylinder block 1, the ring sleeve portion 61 is pressed against the inner wall of the cylinder block 1 and forms a seal with the inner wall of the cylinder block 1.

[0027] A plurality of connection snap rings 64 coaxially arranged with the ring sleeve portion 61 are provided on the inner wall of the ring sleeve portion 61. Each connection snap ring 64 is uniformly distributed on the inner wall of the ring sleeve portion 61 along the extension direction of the axis of the ring sleeve portion 61. A connection slot 51 adapted to the connection snap ring 64 is provided on the outer wall of the boss 5. The sealing cap 6 is installed on the boss 5 by the snap connection of the connection snap ring 64 and the connection slot 51.

[0028] One end of each connecting snap ring 64 away from the inner wall of the ring sleeve portion 61 is provided with a hook portion 65 integrally formed with the connecting snap ring 64. A locking hook groove 52 corresponding to the hook portion 65 is provided in the connecting slot 51. After each connecting snap ring 64 is inserted into the connecting slot 51, it is fixed in the connecting slot 51 through the cooperation of the hook portion 65 and the locking hook groove 52.

[0029] A plurality of sealing convex rings 63 are provided on the outer wall of the ring sleeve portion 61. Each sealing convex ring 63 is evenly distributed on the outer wall of the ring sleeve portion 61 along the extension direction of the axis of the ring sleeve portion 61. A sealing groove 10 corresponding to each sealing convex ring 63 is provided on the inner wall of the cylinder block 1. The cross section of the sealing convex ring 63 is trapezoidal, and the cross section of the sealing groove 10 is also trapezoidal. After the convex block of the ring sleeve portion 61 on the cylinder head 2 extends into the cylinder block 1, it is hermetically connected to the inner wall of the cylinder block 1 through the cooperation of each sealing convex ring 63 and the sealing groove 10.

[0030] Buffer pads 31 are provided on both end faces of the piston 3.

[0031] Working principle of the utility model: During the use of the utility model, first install the cylinder head 2, piston 3, piston rod 4 and cylinder block 1. When installing the cylinder head 2, first install the sealing cap 6 on the boss 5. During the installation process, the hook parts 65 on each connecting snap ring 64 overcome their own plasticity and extend into the locking groove 52 of the connecting slot 51. After each connecting snap ring 64 is snapped into the corresponding connecting slot 51, the sealing cap 6 is stably and firmly installed on the boss 5 of the cylinder head 2. During the installation of the inner wall of the cylinder head 2 and the cylinder block 1, the cooperation between the sealing convex ring 63 on the outer wall of the sealing cap 6 and the sealing groove 10 ensures the stability and tightness of their connection. The sealing convex ring 63 and the sealing groove 10 are set in a trapezoidal shape, effectively ensuring that there is no axial movement between the sealing cap 6 and the inner wall of the cylinder block 1, and also avoiding leakage after the cylinder head 2 and the cylinder block 1 are connected. After the boss 5 on the cylinder head 2 is hermetically connected to the inner wall of the cylinder block 1, the cylinder head 2 is fixedly connected to the cylinder block 1 through a locking member. The buffer part 62 on the sealing cap 6 can also protect the cylinder block 1 when the piston 3 slides to the limit position. During the use of the hydraulic cylinder, when the first oil port 13 on the first chamber 11 is connected to an external oil tank and starts to fill with oil, when the pressure in the hydraulic cylinder is too high, the changeover valve 8 opens the on-off channel 72 on the buffer channel 7 that connects the oil inlet channel 71 to the first chamber 11 and the oil outlet channel 74 to the second chamber 12. When the first chamber 11 is filling with oil, that is, when the piston rod 4 extends outwards, part of the oil enters the second chamber 12 through the first chamber 11, the opened on-off channel 72, the variable diameter channel 73 and the oil outlet channel 74, thereby performing partial pressure relief on the oil in the first chamber 11. Similarly, when the second chamber 12 is filling with oil, that is, when the piston rod 4 retracts, the changeover valve 8 switches the opening and closing of the on-off channel 72. The oil in the second chamber 12 enters the first chamber 11 in sequence through the oil inlet channel 71, the on-off channel 72, the variable diameter channel 73 and the oil outlet channel 74, thereby performing pressure relief and buffering during the retraction of the piston rod 4. This effectively solves the problem in the prior art that the buffering performance of the hydraulic cylinder is poor, and the excessive pressure of the hydraulic cylinder greatly affects the service life of the hydraulic cylinder, greatly improving the stability and safety during the use of the hydraulic cylinder. The structure is ingenious, convenient and practical.

[0032] In the specific embodiments described above, the purpose, technical solutions and beneficial effects of the present utility model have been further described 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 within the protection scope of the present utility model.

Claims

1. A buffer hydraulic cylinder, comprising a cylinder body, a cylinder head mounted on the cylinder body, a seal mounted between the cylinder body and the cylinder head, a piston slidably arranged in the cylinder body, and a piston rod fixed on the piston and capable of sliding under the drive of the piston, wherein the piston divides the inner cavity of the cylinder body into a first chamber and a second chamber, and the cylinder body is provided with a first oil port and a second oil port, wherein the first oil port is communicated with the first chamber, and the second oil port is communicated with the second chamber; characterized in that: The inner wall of the cylinder body is provided with two symmetrically arranged buffer channels which can buffer the sliding of the piston, each buffer channel is connected to the inner cavity of the cylinder body, each buffer channel includes an oil inlet channel, a pass-stop channel, a variable diameter channel and an oil outlet channel which are connected in sequence, the oil inlet channel in the first buffer channel is connected to the first chamber, and the oil outlet channel is connected to the second chamber, the oil inlet channel of the second buffer channel is connected to the second chamber, and the oil outlet channel is connected to the first chamber, an inlet and an outlet are respectively provided at both ends of the variable diameter channel, the inlet of the variable diameter channel is connected to the pass-stop channel, and the outlet of the variable diameter channel is connected to the oil outlet channel, the diameter of the inlet of the variable diameter channel is larger than the diameter of the outlet of the variable diameter channel, a reversing valve which can control the two pass-stop channels to switch on and off is provided between the two pass-stop channels, and each buffer channel supplies oil through the switching of the reversing valve and relieves the pressure of the piston and the piston rod.

2. A buffer hydraulic cylinder according to claim 1, characterized in that: The cylinder head is provided with a boss coaxially arranged with the inner cavity of the cylinder body, and the boss is covered with a plastic sealing cap. The sealing cap includes an annular sleeve portion sleeved on the outer wall of the boss, and a buffer portion pressed against the end face of the boss. The annular sleeve portion and the buffer portion are integrally formed. After the cylinder head is installed on the cylinder body, the annular sleeve portion presses against the inner wall of the cylinder body and forms a seal with the inner wall of the cylinder body.

3. A buffer hydraulic cylinder according to claim 2, characterized in that: The inner wall of the annular sleeve portion is provided with a plurality of connecting snap rings coaxially arranged with the annular sleeve portion, and each connecting snap ring is evenly distributed on the inner wall of the annular sleeve portion along the extension direction of the axis of the annular sleeve portion. The outer wall of the boss is provided with a connecting groove adapted to the connecting snap ring, and the sealing cover cap is mounted on the boss by clamping the connecting snap ring and the connecting groove.

4. A buffer hydraulic cylinder according to claim 3, characterized in that: A hook portion integrally formed with the connecting snap ring is provided at one end of each connecting snap ring away from the inner wall of the ring sleeve, and a locking hook groove corresponding to the hook portion is provided in the connecting slot. After each connecting snap ring is inserted into the connecting slot, it is fixed in the connecting slot through the cooperation between the hook portion and the locking hook groove.

5. A buffer hydraulic cylinder according to claim 4, characterized in that: A plurality of sealing convex rings are arranged on the outer wall of the ring sleeve portion, and the sealing convex rings are evenly distributed on the outer wall of the ring sleeve portion along the extension direction of the axis of the ring sleeve portion. A sealing groove corresponding to each sealing convex ring is arranged on the inner wall of the cylinder body, and the cross-section of the sealing convex ring is trapezoidal, and the cross-section of the sealing groove is also trapezoidal. After the convex block on the cylinder cover extends into the cylinder body, the ring sleeve portion is closed and connected to the inner wall of the cylinder body through the cooperation of each sealing convex ring and the sealing groove.

6. A buffer hydraulic cylinder according to claim 5, characterized in that: Buffer pads are provided on both end surfaces of the piston.

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