Impact-resistant hydraulic damper

Abstract

The utility model relates to the technical field of dampers, in particular to an impact-resistant hydraulic damper which comprises a damper shell, a lower piston block and an upper piston block, the lower piston block and the upper piston block are both arranged in the damper shell, and the lower piston block is located below the upper piston block. A hydraulic oil cavity located above the upper piston block is formed in the upper portion in the damper shell, two vertically-through oil holes are formed in the upper end of the upper piston block, and two limiting guide rods distributed left and right are fixed between the lower piston block and the upper piston block. According to the hydraulic damper, the upper piston block and the lower piston block are arranged, movement of the upper piston block and movement of the lower piston block are buffered through the combination of the buffer spring and the return spring, the service life of the upper piston block and the service life of the lower piston block are prolonged, and the damping degree of the hydraulic damper is adjusted according to the use condition of the damper; therefore, the impact resistance of the hydraulic damper is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to damper technical field especially is related to a kind of impact-resistant hydraulic dampers. BACKGROUND

[0002] Hydraulic damper is an important engineering equipment, mainly used for controlling and reducing the vibration of pipeline and equipment when subjected to periodic load or impact load. It controls the movement of hydraulic cylinder piston through special structure valve, effectively reduces the influence of periodic load and impact load of pipeline or equipment;

[0003] In prior art, the piston block in hydraulic damper is generally integrated, piston block is pushed by hydraulic oil, lacking buffering measures, piston block is easily damaged, seriously affecting the service life of piston block, and the damping degree of hydraulic damper is limited, so that the damping degree of hydraulic damper cannot be adjusted according to impact resistance, causing poor impact resistance of existing hydraulic damper. UTILITY MODEL CONTENTS

[0004] The utility model provides a kind of impact-resistant hydraulic damper, it is beneficial to promote the service life of piston block, and it is beneficial to adjust the damping degree of hydraulic damper according to impact resistance.

[0005] In order to solve the prior art problem, the utility model discloses an impact-resistant hydraulic damper, including damper shell, lower piston block and upper piston block, the lower piston block and upper piston block are located in damper shell, and the lower piston block is below upper piston block;

[0006] Hydraulic oil cavity is opened in the upper part of the damper shell above upper piston block, two oil holes are opened in the upper end of upper piston block, two limit guide rods are fixed between lower piston block and upper piston block, piston buffer block is slidably connected between two limit guide rods, buffer spring is connected to the lower end of piston buffer block on both sides, and the lower end of buffer spring is connected to the upper end of lower piston block.

[0007] Piston rod is fixed to the middle of the lower end of piston buffer block, piston rod is slidably penetrated through lower piston block, and piston rod is slidably penetrated out of the lower surface of damper shell, return spring is connected between the bottom of damper shell and lower piston block, and return spring is sleeved on the periphery of piston rod.

[0008] Extension spring is connected to the both sides of the lower end of damper shell, adjusting plate is connected to the lower end of extension spring, and damping adjusting assembly is arranged between two adjusting plates.

[0009] Further, sealing plate is connected to the upper end of piston buffer block, and sealing plate covers the lower end of oil hole.

[0010] Further, the lower piston block upper end is connected with the first sealing ring which is sleeved on the outer periphery of the piston rod.

[0011] Further, the damper housing lower end is connected with the second sealing ring which is sleeved on the outer periphery of the piston rod.

[0012] Further, the damping adjustment assembly comprises an adjustment sleeve and two threaded positioning rods, the adjustment sleeve is fixed between two adjustment plates, and the adjustment sleeve is sleeved on the outer periphery of the piston rod.

[0013] Further, the lower part of the left and right sides of the piston rod is provided with a plurality of positioning screw holes, and the two threaded positioning rods are respectively threaded on the two sides of the adjustment sleeve, and each threaded positioning rod is threaded with any adjacent positioning screw hole.

[0014] Compared with the prior art, the utility model realizes the beneficial effects that:

[0015] 1. By setting up the upper piston block and the lower piston block, the movement of the upper piston block and the lower piston block is buffered in combination with the buffer spring and the return spring, and the service life of the upper piston block and the lower piston block is improved.

[0016] 2. By setting up the damping adjustment assembly, the elasticity of the expansion spring is adjusted, so that the damping degree of the piston rod during movement can be adjusted, and the damping degree of the hydraulic damper can be adjusted according to the use of the damper, so that the impact resistance of the hydraulic damper is improved. DRAWINGS

[0017] Figure 1 It is the overall structure schematic view of the utility model;

[0018] Figure 2 It is the overall internal structure schematic view of the utility model;

[0019] Figure 3 It is the A local enlarged structure schematic view of the utility model;

[0020] Figure 4 It is the B local enlarged structure schematic view of the utility model.

[0021] Figures 1-4 M: damper housing 1, piston rod 2, lower piston block 3, upper piston block 4, oil hole 5, piston buffer block 6, limiting guide rod 7, sealing plate 8, first sealing ring 9, buffer spring 10, return spring 11, second sealing ring 12, expansion spring 13, adjustment sleeve 14, adjustment plate 15, positioning screw hole 16, threaded positioning rod 17, hydraulic oil cavity 18. PREFERRED EMBODIMENT

[0022] A kind of impact-resistant hydraulic damper:

[0023] As Figures 1-3 shown in the embodiment, the damper shell 1, the lower piston block 3 and the upper piston block 4 are arranged in the damper shell 1, the lower piston block 3 is below the upper piston block 4, the upper part of the damper shell 1 is provided with the hydraulic oil cavity 18 above the upper piston block 4, the upper end of the upper piston block 4 is provided with two oil holes 5 penetrating up and down, two limiting guide rods 7 are arranged between the lower piston block 3 and the upper piston block 4, the piston buffer block 6 is slidably sleeved between the two limiting guide rods 7, the buffer spring 10 is connected to the lower end of the piston buffer block 6 on both sides, the lower end of the buffer spring 10 is connected to the upper end of the lower piston block 3, the piston rod 2 is fixed to the middle of the lower end of the piston buffer block 6, the piston rod 2 slidably penetrates through the lower piston block 3 and penetrates out of the lower surface of the damper shell 1, the return spring 11 is arranged between the bottom of the damper shell 1 and the lower piston block 3, and the return spring 11 is sleeved on the outer periphery of the piston rod 2.

[0024] When the hydraulic damper works, the hydraulic oil in the hydraulic oil cavity 18 enters the oil hole 5, the pressure of the hydraulic oil enters the oil hole 5 and pushes open the piston buffer block 6 downward, the piston buffer block 6 slides downward along the limiting guide rod 7, and the piston buffer block 6 compresses the buffer spring 10, so that the elasticity of the buffer spring 10 is used to buffer the upper piston block 4 and the lower piston block 3 once, reduce the impact force, and then the downward thrust generated by the downward movement of the piston buffer block 6 pushes the lower piston block 3 downward, so as to drive the lower piston block 3 to move downward, and the lower piston block 3 compresses the return spring 11, so that the elasticity of the return spring 11 is used to buffer the upper piston block 4 and the lower piston block 3 again, when the lower piston block 3 and the upper piston block 4 move upward to reset, the buffer spring 10 resets and drives the piston buffer block 6 to move upward to reset, and the piston buffer block 6 drives the sealing plate 8 to cover the oil hole 5, so as to reciprocate and realize damping and buffering. In summary, by arranging the upper piston block 4 and the lower piston block 3, and arranging the piston buffer block 6 between the upper piston block 4 and the lower piston block 3 for buffering, and combining the buffer spring 10 and the return spring 11 to buffer the movement of the upper piston block 4 and the lower piston block 3, the impact force of the upper piston block 4 and the lower piston block 3 is buffered, so as to improve the service life of the upper piston block 4 and the lower piston block 3.

[0025] As Figure 2 , 4As shown, in this embodiment, both sides of the lower end of the damper housing 1 are connected to a telescopic spring 13, and the lower ends of the telescopic springs 13 are connected to an adjusting plate 15. A damping adjustment assembly is provided between the two adjusting plates 15. The damping adjustment assembly includes an adjusting sleeve 14 and two threaded positioning rods 17. The adjusting sleeve 14 is fixed between the two adjusting plates 15 and is slidably sleeved around the piston rod 2. Several positioning screw holes 16 are opened on the lower part of both sides of the piston rod 2. The two threaded positioning rods 17 are respectively threaded to both sides of the adjusting sleeve 14, and each threaded positioning rod 17 is threaded to any adjacent positioning screw hole 16.

[0026] When adjusting the damping level of the hydraulic damper according to usage, with the threaded positioning rod 17 threadedly connected to the positioning screw hole 16, unscrew the threaded positioning rod 17 out of the positioning screw hole 16. Then, pull the adjusting sleeve 14 up and down. As the adjusting sleeve 14 moves the adjusting plate 15 up and down, the adjusting plate 15 will compress or stretch the corresponding telescopic spring 13 until it is adjusted to the appropriate position. To prevent the adjusting sleeve 14 from moving further, since multiple positioning screw holes 16 are provided, tighten the threaded positioning rod 17 into the corresponding positioning screw hole 16 to fix it. When the piston rod 2 moves up and down, the adjusting sleeve 14 and the adjusting plate 15 will move up and down together. Since the elasticity of the telescopic spring 13 has changed, that is, the elastic force of the telescopic spring 13 has changed whether it is contracted or extended, the piston rod 2 will be affected by the elastic force of the telescopic spring 13 whenever it moves up and down. This makes it easier to adjust the damping degree of the hydraulic damper according to the usage. Since the telescopic spring 13 will share part of the impact force, the impact resistance of the hydraulic damper will be improved.

[0027] like Figure 3 As shown, in this embodiment, the upper end of the piston buffer block 6 is connected to a sealing plate 8, and the sealing plate 8 covers the lower end of the oil hole 5.

[0028] By setting the sealing plate 8, when the buffer spring 10 resets and drives the piston buffer block 6 to move upward and reset, the piston buffer block 6 will drive the sealing plate 8 to cover the oil hole 5. This process is repeated to achieve oil return buffering. When the hydraulic oil flows through the oil hole 5 again and pushes down to open the piston buffer block 6 and the sealing plate 8, it prevents the hydraulic oil from directly impacting the lower piston block 3 through the oil hole 5, thereby better protecting the lower piston block 3.

[0029] like Figure 1 As shown, in this embodiment, the upper end of the lower piston block 3 is connected to a first sealing ring 9 sleeved around the piston rod 2, and the lower end of the damper housing 1 is connected to a second sealing ring 12 sleeved around the piston rod 2.

[0030] By setting the first sealing ring 9, it is beneficial to seal the connection between the piston rod 2 and the lower piston block 3, avoiding the leakage of hydraulic oil through the connection between the piston rod 2 and the lower piston block 3. By setting the second sealing ring 12, it is beneficial to seal the connection between the damper housing 1 and the piston rod 2, avoiding the leakage of hydraulic oil through the connection between the damper housing 1 and the piston rod 2.

Claims

1. An impact-resistant hydraulic damper, comprising a damper housing (1), a lower piston block (3) and an upper piston block (4), the lower piston block (3) and the upper piston block (4) are both arranged in the damper housing (1), and the lower piston block (3) is below the upper piston block (4), characterized in that: a hydraulic oil cavity (18) is formed above the upper piston block (4) in the upper part of the damper housing (1), two oil holes (5) are formed in the upper piston block (4) and extend through the upper piston block (4) from top to bottom, two limiting guide rods (7) are fixed between the lower piston block (3) and the upper piston block (4) and are distributed left and right, a piston buffer block (6) is slidably sleeved between the two limiting guide rods (7), a buffer spring (10) is connected to the lower end of each side of the piston buffer block (6), and the lower end of the buffer spring (10) is connected to the upper end of the lower piston block (3); a piston rod (2) is fixed to the middle of the lower end of the piston buffer block (6), the piston rod (2) slidably penetrates through the lower piston block (3), and the piston rod (2) penetrates out of the lower end of the damper housing (1), a return spring (11) is connected between the bottom of the damper housing (1) and the lower piston block (3), and the return spring (11) is sleeved on the outer periphery of the piston rod (2); a telescopic spring (13) is connected to each side of the lower end of the damper housing (1), an adjusting plate (15) is connected to the lower end of each telescopic spring (13), and a damping adjusting assembly is arranged between the two adjusting plates (15). a sealing plate (8) is connected to the upper end of the piston buffer block (6), and the sealing plate (8) covers the lower end of the oil hole (5).

2. A shock resistant hydraulic damper according to claim 1, characterized in that: a first sealing ring (9) is sleeved on the outer periphery of the piston rod (2) and connected to the upper end of the lower piston block (3).

3. A shock resistant hydraulic damper according to claim 1, characterized in that: a second sealing ring (12) is sleeved on the outer periphery of the piston rod (2) and connected to the lower end of the damper housing (1).

4. A shock-resistant hydraulic damper according to claim 1, characterized in that: The damping adjusting assembly comprises an adjusting sleeve (14) and two threaded positioning rods (17), the adjusting sleeve (14) is fixed between the two adjusting plates (15), and the adjusting sleeve (14) is slidably sleeved on the outer periphery of the piston rod (2).

5. A shock-resistant hydraulic damper according to claim 1, characterized in that: A plurality of positioning screw holes (16) are formed in the lower part of each side of the piston rod (2), the two threaded positioning rods (17) are respectively screwed on the two sides of the adjusting sleeve (14), and each threaded positioning rod (17) is screwed with any adjacent positioning screw hole (16).

6. A shock resistant hydraulic damper according to claim 5, wherein: ​

Images