Bottom buffering type hydraulic cylinder

Abstract

The invention discloses a bottom buffering type hydraulic cylinder, and relates to the technical field of hydraulic cylinders. The top of the fixed base is fixedly connected with two protection plates, the bottom of the fixed base is fixedly connected with a cylinder tail, the top of the fixed base is fixedly connected with a cylinder barrel, one side of the inner wall of the cylinder barrel is slidably connected with an oil piston rod, and one end of the piston rod is fixedly connected with a piston seat. The elastic piece is arranged in the buffer assembly, the elastic framework is arranged in the elastic piece, the elastic piece is fixed to the bottom of the cylinder barrel in an M shape when not subjected to pressure in cooperation with the first spring, the rebound resilience of the elastic piece is good, and the automatic reset effect is achieved; the width of the position, close to the bottom of the cylinder barrel, of the elastic piece is smaller than that of the top of the cylinder barrel, the weakening groove is formed in the connecting position, when the piston rod returns, the piston seat firstly impacts the surface of the elastic piece, the elastic piece deforms downwards under the action of the weakening groove, and the buffering effect on the piston rod is improved.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic cylinders, and in particular to a bottom buffer type hydraulic cylinder. Background Art

[0002] The hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion or swinging motion. It has a simple structure and reliable operation. When using it to achieve reciprocating motion, the deceleration device can be eliminated, and there is no transmission gap and the movement is smooth. Therefore, it is widely used in the hydraulic systems of various machines.

[0003] During the use of current hydraulic cylinders, the temperature of the hydraulic oil in the hydraulic cylinder will increase due to the friction between the piston assembly and the cylinder body. Especially in summer, hydraulic cylinders installed outdoors are exposed to the sun during use, which increases the temperature of the hydraulic oil in the hydraulic cylinder. This will cause the viscosity of the hydraulic oil to decrease, easily causing leakage, accelerating the wear of the hydraulic cylinder, generating carbides and sludge, and accelerating the oxidation of the hydraulic oil, resulting in the deterioration of the hydraulic oil and corrosion of the oil pipe, causing the pipe to rupture.

[0004] In the prior art, a Chinese patent with a publication number of CN118066187A is proposed to solve the above-mentioned technical problems. The technical solution disclosed in the patent document is as follows: a high-strength hydraulic cylinder protection structure, including a protection box and a cover, the protection box and the cover are made of high-strength alloy steel, and an airbag sleeve is arranged on the cover, a water inlet tank and a water outlet tank are arranged on one side of the box, and a serpentine pipe is fixedly arranged on the box wall adjacent to the water inlet tank and the water outlet tank in the protection box. Since the return speed of the hydraulic cylinder is relatively fast when running quickly, when the hydraulic cylinder drives a large mass load, due to excessive kinetic energy, a violent collision phenomenon will occur between the piston and the cylinder bottom and the guide sleeve at the end of the stroke, which greatly affects the normal service life and accuracy of the hydraulic cylinder. At this stage, a method of external control of the hydraulic cylinder is adopted to increase the stroke induction of the hydraulic cylinder, and the hydraulic cylinder operation speed is reduced by controlling the hydraulic oil flow at the terminal. Its structure is relatively complex and the cost is high, which increases the cost of use, cannot be widely used, and reduces practicality. Summary of the invention

[0005] The purpose of the present invention is to provide a bottom-buffered hydraulic cylinder to solve the problem proposed in the above background technology that when the hydraulic cylinder drives a large mass load, due to excessive kinetic energy, a violent collision will occur between the piston and the cylinder bottom and the guide sleeve at the end of the stroke, thereby greatly affecting the normal service life and accuracy of the hydraulic cylinder.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A bottom-buffered hydraulic cylinder comprises a fixed base; two protective plates are fixedly connected to the top of the fixed base, a cylinder tail is fixedly connected to the bottom of the fixed base, a cylinder barrel is fixedly connected to the top of the fixed base, an oil piston rod is slidably connected to one side of the inner wall of the cylinder barrel, one end of the piston rod is fixedly connected to a piston seat, the piston seat is slidably connected to the inner wall of the cylinder barrel, and one end of the piston rod away from the piston seat extends to the outside of the cylinder barrel; a buffer assembly, the buffer assembly is used to buffer the kinetic energy generated when the piston seat moves, and the buffer assembly is connected to the cylinder barrel; a drainage assembly, the drainage assembly is used to slow down the running speed of the piston seat, and the drainage assembly is connected to the fixed base.

[0008] The above technical solution is adopted, in which there are two fixed bases, which are located at the top and bottom of the cylinder respectively, and two protective plates that are adapted to the shape of the cylinder are symmetrically installed on the top of the two fixed bases, and the cylinder is protected on the outer wall by the protective plates.

[0009] A further improvement of the technical solution of the present invention is that the buffer assembly includes an elastic sheet fixedly connected to the inner wall of the cylinder, the bottom of the elastic sheet is fixedly connected to a first spring, and the number of the first springs is five.

[0010] The above-mentioned technical solution is adopted, in which the elastic sheet is located at the bottom position of the inner wall of the cylinder, the bottom of the elastic sheet is connected to the bottom of the cylinder, and a weakening groove is provided at the connection position. When the above-mentioned piston rod returns, the piston seat first hits the surface of the elastic sheet, and the elastic sheet is deformed downward under the action of the weakening groove.

[0011] A further improvement of the technical solution of the present invention is that the elastic sheet is an M-shaped elastic structure, two clamping balls are symmetrically installed on the outer wall of the elastic sheet, limiting grooves are symmetrically opened on the inner wall of the cylinder, and a fixed sliding groove is opened on the inner wall of the limiting groove.

[0012] The above technical solution is adopted, in which an elastic skeleton is provided inside the elastic sheet, which cooperates with the first spring so that the elastic sheet is fixed to the bottom of the cylinder in an M shape when not under pressure, so that the elastic sheet has better resilience and achieves the effect of automatic reset. It should be noted that the width of the elastic sheet near the bottom of the cylinder is smaller than the width at the top.

[0013] A further improvement of the technical solution of the present invention is that the inner side of the fixed slide groove is slidably connected to a limit plate, the top of the limit plate is fixedly connected to an elastic support seat, the elastic support seat is adapted to the shape contour of the snap-fitting ball, and the bottom of the elastic support seat is fixedly connected to a third spring.

[0014] The above-mentioned technical solution is adopted, in which the elastic support seat is a trapezoidal elastic structure, and is fixed in the limit groove by a third spring and a limit plate. The groove on the top of the elastic support seat is adapted to the shape contour of the snap-in ball. When the elastic sheet is subjected to the return force of the above-mentioned piston rod, it expands outward. At this time, the snap-in ball can be inserted into the groove on the top of the elastic support seat.

[0015] A further improvement of the technical solution of the present invention is that the drainage component includes an oil port opened on the outer wall of the fixed base, a conical hole is opened on the top of the oil port, a conical block is slidably inserted on the inner wall of the conical hole, and the conical hole is adapted to the shape contour of the conical block.

[0016] The above technical solution is adopted, in which the diameter of the conical block is smaller than the diameter of the conical hole. When the above piston rod returns, it first contacts the elastic sheet and squeezes the elastic sheet so that the elastic sheet deforms downward. At this time, the bottom of the elastic sheet contacts the conical block.

[0017] A further improvement of the technical solution of the present invention is that a plurality of oil holes are provided at the bottom of the conical block, a baffle is rotatably connected to the inner wall of the conical block, and a T-bar is fixedly connected to the bottom of the conical block.

[0018] The above-mentioned technical solution is adopted, in which a conical cavity is provided inside the conical block, and a protruding block extending inward is provided at the bottom position, the bottom of which is connected to the T-bar, forming an integrated structure, and a plurality of oil holes are provided at the bottom of the conical block, so that the hydraulic oil can enter the conical block from the bottom of the conical block.

[0019] A further improvement of the technical solution of the present invention is that two second springs are fixedly connected to the bottom of the T-shaped rod, and a support rod is slidably inserted into the inner wall of the T-shaped rod.

[0020] The above technical solution is adopted, in which the conical block is supported on the top of the conical hole by a T-rod, a support rod and a second spring, the support rod is inserted into the inner wall of the T-rod, the baffle at the bottom of the T-rod is connected to the second spring, and the conical block is adapted to the shape contour of the conical hole.

[0021] A further improvement of the technical solution of the present invention is that a shock-absorbing base is fixedly connected to the middle position of the top of the fixed base, and the shock-absorbing base is made of corrugated rubber material.

[0022] By adopting the above technical solution, the shock-absorbing base at the middle position of the fixed base has a good shock-absorbing effect, which can reduce and absorb the vibration and impact generated when the piston rod returns, and protect the service life and accuracy of the hydraulic cylinder from being affected.

[0023] Due to the adoption of the above technical solution, the present invention has the following technical advances compared with the prior art:

[0024] 1. The present invention provides a bottom buffer hydraulic cylinder, in which an elastic sheet is arranged in a buffer assembly, and an elastic skeleton is arranged inside the elastic sheet. The elastic sheet cooperates with a first spring so that the elastic sheet is fixed to the bottom of the cylinder in an M shape when not under pressure, so that the elastic sheet has better resilience and achieves an automatic reset effect. It should be noted that the width of the elastic sheet near the bottom of the cylinder is smaller than the width at the top, the elastic sheet is located at the bottom position of the inner wall of the cylinder, the bottom of the elastic sheet is connected to the bottom of the cylinder, and a weakening groove is provided at the connection position. When the above-mentioned piston rod returns, the piston seat first hits the surface of the elastic sheet, and the elastic sheet is deformed downward under the action of the weakening groove, thereby increasing the buffering effect on the piston rod.

[0025] 2. The present invention provides a bottom buffer hydraulic cylinder. A conical block is arranged in the drainage assembly. When the conical block moves downward, the gap between it and the conical hole is gradually reduced. Therefore, the speed of hydraulic oil discharge will gradually decrease, further reducing the return speed of the hydraulic cylinder, thereby avoiding the phenomenon of wear caused by violent collision between the piston seat and the bottom. The conical block is supported on the top of the conical hole by a T-rod, a support rod and a second spring. The support rod is inserted into the inner wall of the T-rod. The baffle at the bottom of the T-rod is connected to the second spring, and the conical block is adapted to the shape contour of the conical hole. It should be noted that the diameter of the conical block is smaller than the diameter of the conical hole.

[0026] 3. The present invention provides a bottom-buffered hydraulic cylinder, in which a conical block is provided with a conical cavity inside, and a protruding block extending inward is provided at the bottom, the bottom of which is connected to a T-bar, forming an integrated structure, and a plurality of oil-permeable holes are provided at the bottom of the conical block, so that hydraulic oil can enter the conical block from the bottom of the conical block. The baffle plate inside the conical block has a diameter larger than the protruding block at the bottom of the conical block, and the baffle plate is a low-density foam plate, which can evenly disperse the load and maintain stable floating. One end of the baffle plate is connected to the inner wall of the conical block, which can evenly disperse the load and maintain stable floating. Therefore, the hydraulic oil can only be discharged through the conical hole, further reducing the return speed of the hydraulic cylinder.

[0027] 4. The present invention provides a bottom-buffered hydraulic cylinder, which forms a complete set of buffer structures by cooperating with each other through the buffer components and drainage components, so as to avoid the piston rod from returning too fast and having too much kinetic energy when running fast, and causing a violent collision between the piston seat and the fixed base at the end of the stroke, which affects the normal service life and accuracy of the hydraulic cylinder. The two have simple structures, better buffering effects, lower use costs, and wider applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further described below in conjunction with the accompanying drawings.

[0029] Figure 1It is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 It is a cross-sectional structural schematic diagram of the present invention;

[0031] Figure 3 It is a schematic diagram of a cutaway three-dimensional structure of the present invention;

[0032] Figure 4 For the present invention Figure 3 A schematic diagram of the partially enlarged structure at center A;

[0033] Figure 5 It is a schematic diagram of a cross-sectional three-dimensional structure of a fixed base in the present invention;

[0034] Figure 6 It is a schematic diagram of the three-dimensional structure of the fixed base in the present invention;

[0035] Figure 7 It is a schematic diagram of the three-dimensional structure of the T-shaped rod and the support rod in the present invention;

[0036] Figure 8 It is a schematic diagram of the cross-sectional three-dimensional structure of the elastic sheet in the present invention;

[0037] Fig. 9 It is a schematic diagram of the three-dimensional structure of the elastic sheet and the elastic support seat of the present invention.

[0038] In the figure: 1. fixed base; 2. protective plate; 3. cylinder barrel; 4. cylinder tail; 5. piston rod; 6. piston seat; 7. oil port; 8. elastic sheet; 9. first spring; 10. conical hole; 11. conical block; 12. baffle plate; 13. oil hole; 14. T-bar; 15. shock-absorbing base; 16. support rod; 17. second spring; 18. snap-in ball; 19. limit groove; 20. third spring; 21. elastic support seat; 22. limit plate; 23. fixed slide groove. DETAILED DESCRIPTION

[0039] The present invention is further described in detail below in conjunction with embodiments:

[0040] Example 1

[0041] like Figure 1 , Figure 2 and Figure 3 As shown, the present invention provides a bottom buffer hydraulic cylinder, including a fixed base 1; two protective plates 2 are fixedly connected to the top of the fixed base 1, a cylinder tail 4 is fixedly connected to the bottom of the fixed base 1, a cylinder barrel 3 is fixedly connected to the top of the fixed base 1, an oil piston rod 5 is slidably connected to one side of the inner wall of the cylinder barrel 3, one end of the piston rod 5 is fixedly connected to a piston seat 6, the piston seat 6 is slidably connected to the inner wall of the cylinder barrel 3, and one end of the piston rod 5 away from the piston seat 6 extends to the outside of the cylinder barrel 3.

[0042] Preferably, a buffer assembly is used to buffer the kinetic energy generated when the piston seat 6 moves, and the buffer assembly is connected to the cylinder 3; a drainage assembly is used to slow down the running speed of the piston seat 6, and the drainage assembly is connected to the fixed base 1.

[0043] In this embodiment, two fixed bases 1 are provided, which are respectively located at the top and bottom of the cylinder 3, and two protective plates 2 matching the shape of the cylinder 3 are symmetrically installed on the top of the two fixed bases 1, and the cylinder 3 is protected on the outer wall by the protective plates 2.

[0044] Specifically, a complete buffer structure is formed by the buffer assembly and the drainage assembly to prevent the piston rod 5 from returning too fast and having too much kinetic energy when running quickly, thereby preventing a violent collision between the piston seat 6 and the fixed base 1 at the end of the stroke, thereby affecting the normal service life and accuracy of the hydraulic cylinder. The two have simple structures, better buffering effects, and lower use costs.

[0045] Example 2

[0046] like Figure 2 , Figure 3 and Figure 8 As shown, based on Example 1, the present invention provides a technical solution: preferably, the buffer assembly includes an elastic sheet 8 fixedly connected to the inner wall of the cylinder 3, the bottom of the elastic sheet 8 is fixedly connected with a first spring 9, the number of the first springs 9 is five, and the elastic sheet 8 is an M-type elastic structure.

[0047] In this embodiment, the elastic sheet 8 is located at the bottom of the inner wall of the cylinder 3, the bottom of the elastic sheet 8 is connected to the bottom of the cylinder 3, and a weakening groove is provided at the connection position. When the piston rod 5 returns, the piston seat 6 first hits the surface of the elastic sheet 8, and the elastic sheet 8 is deformed downward under the action of the weakening groove.

[0048] Specifically, the interior of the elastic sheet 8 is provided with an elastic skeleton, which cooperates with the first spring 9 so that the elastic sheet 8 is fixed to the bottom of the cylinder 3 in an M shape when not under pressure, so that the elastic sheet 8 has better resilience and achieves the effect of automatic reset. It should be noted that the width of the elastic sheet 8 near the bottom of the cylinder 3 is smaller than the width of the top, and its central part is hollow. The shape contour is adapted to the shape contour of the bottom of the above-mentioned piston seat 6, and the diameter is larger than the diameter of the piston seat 6. The top is inclined toward the center, which is more conducive to the contact between the piston seat 6 and it is used to reduce impact and vibration and protect the service life and accuracy of the hydraulic cylinder.

[0049] Example 3

[0050] like Figure 8 and Fig. 9As shown, on the basis of Example 1, the present invention provides a technical solution: preferably, two snap-in balls 18 are symmetrically installed on the outer wall of the elastic sheet 8, and limiting grooves 19 are symmetrically arranged on the inner wall of the cylinder 3, and a fixed slide groove 23 is arranged on the inner wall of the limiting groove 19, and the inner side of the fixed slide groove 23 is slidably connected to a limiting plate 22, and the top of the limiting plate 22 is fixedly connected to an elastic support seat 21, and the elastic support seat 21 is adapted to the shape contour of the snap-in balls 18, and the bottom of the elastic support seat 21 is fixedly connected to a third spring 20.

[0051] In this embodiment, the elastic support seat 21 is a trapezoidal elastic structure, and is fixed in the limiting groove 19 by the third spring 20 and the limiting plate 22. The groove at the top of the elastic support seat 21 is adapted to the shape and contour of the snap-in ball 18. When the elastic sheet 8 is subjected to the return force of the piston rod 5, it expands outward. At this time, the snap-in ball 18 can be inserted into the groove at the top of the elastic support seat 21, and the top of the elastic sheet 8 gradually fits its bottom under the impact of the piston rod 5. In this process, the snap-in ball 18 gradually moves downward with the elastic sheet 8, and causes the bottom of the elastic support seat 21 to slide downward. It should be noted that the two elastic Two limit plates 22 are provided at the bottom of the support seat 21, among which the limit plate 22 located in the upper part is fixed and connected to the inner wall of the limit groove 19, and the lower part can slide in the fixed slide groove 23. Under the action of the third spring 20 and the elastic support seat 21 itself, the damping force of the elastic sheet 8 moving downward is increased, thereby consuming vibration energy and achieving shock absorption effect, and further increasing the effect of buffering the return kinetic energy of the above-mentioned piston rod 5. When not subjected to the extrusion force of the clamping ball 18, the elastic support seat 21 returns to its original position under the action of its own elastic force and the force of the third spring 20. The overall structure is simple and compact, and has a wider applicability.

[0052] Example 4

[0053] like Figure 4 , Figure 5 and Figure 7 As shown, on the basis of Example 1, the present invention provides a technical solution: preferably, the drainage component includes an oil port 7 opened on the outer wall of the fixed base 1, a conical hole 10 is opened at the top of the oil port 7, a conical block 11 is slidably inserted on the inner wall of the conical hole 10, the conical hole 10 is adapted to the shape contour of the conical block 11, a plurality of oil holes 13 are opened at the bottom of the conical block 11, a blocking plate 12 is rotatably connected to the inner wall of the conical block 11, a T-bar 14 is fixedly connected to the bottom of the conical block 11, two second springs 17 are fixedly connected to the bottom of the T-bar 14, a support rod 16 is slidably inserted on the inner wall of the T-bar 14, and a shock-absorbing base 15 is fixedly connected to the middle position of the top of the fixed base 1, and the shock-absorbing base 15 is made of corrugated rubber.

[0054] In this embodiment, the conical block 11 is supported on the top of the conical hole 10 by a T-bar 14, a support rod 16 and a second spring 17. The support rod 16 is inserted into the inner wall of the T-bar 14. The baffle at the bottom of the T-bar 14 is connected to the second spring 17, and the conical block 11 is adapted to the shape contour of the conical hole 10. It should be noted that the diameter of the conical block 11 is smaller than the diameter of the conical hole 10. When the above-mentioned piston rod 5 returns, it first contacts the elastic sheet 8 and squeezes the elastic sheet 8 to cause the elastic sheet 8 to deform downward. At this time, the bottom of the elastic sheet 8 contacts the conical block 11, so that the conical block 11 moves downward in a straight line with the cooperation of the support rod 16 and the second spring 17. The shock-absorbing base 15 at the middle position of the fixed base 1 has a good shock-absorbing effect, which can reduce and absorb the vibration and impact generated when the piston rod 5 returns, and protect the service life and accuracy of the hydraulic cylinder from being affected.

[0055] Specifically, when the conical block 11 moves downward, the gap between it and the conical hole 10 gradually decreases, so the speed of hydraulic oil discharge will gradually decrease, further reducing the return speed of the hydraulic cylinder, thereby avoiding the phenomenon of wear caused by violent collision between the piston seat 6 and the bottom, compression and flow generate damping force, thereby consuming vibration energy and achieving shock absorption effect.

[0056] Furthermore, a conical cavity is provided inside the conical block 11, and a protruding block extending inward is provided at the bottom position, and its bottom is connected to the T-shaped rod 14, which is an integrated structure, and a plurality of oil-permeable holes 13 are provided at the bottom of the conical block 11, so that hydraulic oil can enter the conical block 11 from the bottom of the conical block 11, and the blocking plate 12 inside the conical block 11 has a diameter larger than the protruding block at the bottom of the conical block 11, and the blocking plate 12 is a low-density foam board, which can evenly disperse the load and maintain stable floating, and one end of the blocking plate 12 is connected to the conical block 11. The inner walls of the conical blocks 11 are connected to each other, which can evenly disperse the load and maintain stable floating. Therefore, when hydraulic oil is injected, the hydraulic oil can enter the conical block 11 from the oil permeable hole 13, so that the baffle plate 12 can be flipped upward, and the hydraulic oil enters the cylinder 3 from the top of the conical block 11. On the contrary, when the hydraulic oil is discharged, since the diameter of the baffle plate 12 is larger than the protruding block at the bottom of the conical block 11, the baffle plate 12 cannot be flipped downward, so the hydraulic oil can only be discharged through the conical hole 10, further reducing the return speed of the hydraulic cylinder.

[0057] The working principle of the bottom buffer hydraulic cylinder is described in detail below.

[0058] like Figure 1-Figure 9As shown, when the hydraulic cylinder is working, the hydraulic oil enters the cylinder 3 through the oil port 7, and the piston seat 6 is subjected to pressure, pushing the piston seat 6 and the piston rod 5 to move in opposite directions, thereby realizing linear motion. In this process, the piston rod 5 and the piston seat 6 first contact the elastic sheet 8 during the return stroke. The elastic sheet 8 is provided with an elastic skeleton inside, and cooperates with the first spring 9 so that the elastic sheet 8 is fixed to the bottom of the cylinder 3 in an M shape when not subjected to pressure, so that the elastic sheet 8 has better resilience and realizes the effect of automatic reset. The width of the elastic sheet 8 near the bottom of the cylinder 3 is smaller than the width of the top. When the elastic sheet 8 is subjected to the return force of the piston rod 5, it expands outward, and the snap-in ball 18 can be inserted into the elastic The top of the elastic sheet 8 gradually fits the bottom of the elastic support seat 21 under the impact of the piston rod 5. During this process, the clamping ball 18 gradually moves downward with the elastic sheet 8, and makes the bottom of the elastic support seat 21 slide downward, and the bottom of the piston seat 6 contacts the shock-absorbing base 15, which further increases the effect of buffering the return kinetic energy of the piston rod 5. The hydraulic oil in the cylinder 3 is gradually compressed at the bottom of the cylinder 3 under the action of the return force of the piston seat 6. Since the elastic sheet 8 is squeezed by the piston seat 6, the elastic sheet 8 is deformed downward. At this time, the bottom of the elastic sheet 8 contacts the conical block 11, so that the conical block 11 moves downward in a straight line under the cooperation of the support rod 16 and the second spring 17. Movement, the interior of the conical block 11 is provided with a conical cavity, and a protruding block extending inward is provided at the bottom position, and its bottom is connected to the T-bar 14, which is an integrated structure, and a plurality of oil-permeable holes 13 are provided at the bottom of the conical block 11, so that the hydraulic oil can enter the conical block 11 from the bottom of the conical block 11, and the baffle plate 12 inside the conical block 11 has a diameter larger than the protruding block at the bottom of the conical block 11, and the baffle plate 12 is a low-density foam plate, which can evenly disperse the load and maintain stable floating, and one end of the baffle plate 12 is connected to the inner wall of the conical block 11, which can evenly disperse the load and maintain stable floating, so when the hydraulic oil is injected, the hydraulic oil can enter the conical block 11 from the oil-permeable hole 13 The baffle plate 12 can be flipped upwards to allow the hydraulic oil to enter the cylinder 3 from the top of the tapered block 11. On the contrary, when the hydraulic oil is discharged, since the diameter of the baffle plate 12 is larger than the raised block at the bottom of the tapered block 11, the baffle plate 12 cannot be flipped downwards. Therefore, the hydraulic oil can only be discharged through the tapered hole 10. When the tapered block 11 moves downward, the gap between it and the tapered hole 10 gradually decreases. Therefore, the speed of hydraulic oil discharge will gradually decrease, further reducing the return speed of the hydraulic cylinder, avoiding the phenomenon of wear caused by severe collision between the piston seat 6 and the bottom, and further reducing the return speed of the hydraulic cylinder, thereby protecting the normal service life and accuracy of the hydraulic cylinder.

[0059] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A bottom-buffered hydraulic cylinder, comprising a fixed base (1); Features: The top of the fixed base (1) is fixedly connected to two protective plates (2), the bottom of the fixed base (1) is fixedly connected to a cylinder tail (4), the top of the fixed base (1) is fixedly connected to a cylinder barrel (3), one side of the inner wall of the cylinder barrel (3) is slidably connected to an oil piston rod (5), one end of the piston rod (5) is fixedly connected to a piston seat (6), the piston seat (6) is slidably connected to the inner wall of the cylinder barrel (3), and one end of the piston rod (5) away from the piston seat (6) extends to the outside of the cylinder barrel (3); A buffer assembly, the buffer assembly is used to buffer the kinetic energy generated when the piston seat (6) moves, and the buffer assembly is connected to the cylinder barrel (3); A drainage component, the drainage component is used to slow down the running speed of the piston seat (6), and the drainage component is connected to the fixed base (1).

2. A bottom buffer hydraulic cylinder according to claim 1, Features: The buffer assembly comprises an elastic sheet (8) fixedly connected to the inner wall of the cylinder (3), the bottom of the elastic sheet (8) is fixedly connected to a first spring (9), and the number of the first springs (9) is five.

3. A bottom buffer hydraulic cylinder according to claim 2, Features: The elastic sheet (8) is an M-shaped elastic structure, two clamping balls (18) are symmetrically mounted on the outer wall of the elastic sheet (8), limiting grooves (19) are symmetrically arranged on the inner wall of the cylinder (3), and a fixed sliding groove (23) is arranged on the inner wall of the limiting groove (19).

4. A bottom buffer hydraulic cylinder according to claim 3, Features: The inner side of the fixed slide groove (23) is slidably connected to a limit plate (22), the top of the limit plate (22) is fixedly connected to an elastic support seat (21), the elastic support seat (21) is adapted to the shape and contour of the clamping ball (18), and the bottom of the elastic support seat (21) is fixedly connected to a third spring (20).

5. A bottom buffer hydraulic cylinder according to claim 1, Features: The drainage component comprises an oil port (7) provided on the outer wall of the fixed base (1), a conical hole (10) being provided at the top of the oil port (7), a conical block (11) being slidably inserted on the inner wall of the conical hole (10), and the conical hole (10) and the conical block (11) are adapted to each other in shape and contour.

6. A bottom buffer hydraulic cylinder according to claim 5, Features: The bottom of the conical block (11) is provided with a plurality of oil-permeable holes (13); a blocking plate (12) is rotatably connected to the inner wall of the conical block (11); and a T-shaped rod (14) is fixedly connected to the bottom of the conical block (11).

7. A bottom buffer hydraulic cylinder according to claim 6, Features: Two second springs (17) are fixedly connected to the bottom of the T-shaped rod (14), and a support rod (16) is slidably inserted into the inner wall of the T-shaped rod (14).

8. A bottom buffer hydraulic cylinder according to claim 5, Features: A shock-absorbing base (15) is fixedly connected to the middle position of the top of the fixed base (1), and the shock-absorbing base (15) is made of corrugated rubber material.

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