Hydraulic damping device

Abstract

The utility model discloses a hydraulic damping device which comprises a shell, a bearing is arranged in the middle of the top end in the shell, a piston rod penetrates through the bearing, a piston is arranged in the shell at the bottom end of the piston rod, and a connecting plate is arranged at the top end of the piston rod. A reset spring is arranged between the bottom end of the piston and the bottom end in the shell, and an oil seal is arranged between the top end of the shell and the outer side of the piston rod. An anti-compression protection assembly is arranged on the outer side of a piston rod at the top end of a shell, when the working piston rod of the device is pressed to retract into the shell excessively, the bottom end of a connecting plate makes contact with a base plate, and meanwhile a protection compression spring is compressed for damping buffering; the hydraulic damping device is prevented from working frequently, the reset spring is prevented from being broken and damaged due to excessive pressure, or the reset rebound effect is prevented from being affected, so that the reset spring is buffered and protected to a certain extent, the service life of the hydraulic damping device is prolonged, and practicability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of dampers, in particular to a hydraulic damping device. Background Art

[0002] The hydraulic damping device is a device that uses liquid resistance to adjust the speed of mechanical movement and reduce impact force. It is widely used in pipelines and equipment in nuclear power plants, thermal power plants, chemical plants, steel plants, etc. The application of hydraulic dampers not only avoids overshoot and vibration of mechanical movement, but also ensures the precise movement of mechanical objects, greatly improving production efficiency.

[0003] For example, a one-way hydraulic damping device disclosed in the utility model with the authorization announcement number CN217401541U includes: a cylinder body, a piston rod, a piston, a positioning ring, a mouth sealing ring, a chamber sealing ring, a guide sleeve, and a liquid. A piston with a center hole is fixed to one end of the piston rod. A through hole, an annular groove, and a drainage groove are provided on the outer cylindrical surface of the piston, which penetrate the outer cylindrical surface and the center hole. The chamber sealing ring is sleeved on the annular groove of the piston and divides the inner cavity of the cylinder body into two upper and lower chambers. One end of the piston rod located in the cylinder body passes through the center hole of the piston and matches the gap with the center hole. When the piston rod is extended, the liquid in the upper chamber enters the lower chamber through the piston through hole and the gap between the piston rod and the piston, providing damping for the extension of the piston rod; when the piston rod is retracted, the liquid in the lower chamber enters the upper chamber through the drainage groove, so that the piston rod is quickly reset. The utility model has a simple and reliable structure. When applied to mechanical devices, it can effectively provide damping for mechanical movement to buffer and quickly reset. However, during the application of this technical solution, if the hydraulic damper is over-pressurized during operation, it is easy to cause the return spring in the cylinder to be over-pressurized and damaged or its elasticity to decrease, thereby affecting the damping and buffering effect of the device. There is a technical problem that the piston rod cannot be damped and buffered when the device is subjected to excessive pressure to protect the return spring and extend the service life of the device. Utility Model Content

[0004] In order to overcome the deficiencies of the prior art, the utility model provides a hydraulic damping device, which can solve the problem that if the hydraulic damper is subjected to excessive pressure during operation, the return spring in the cylinder body may be easily damaged or its elasticity may decrease, thereby affecting the damping and buffering effect of the device. There is a technical problem that the piston rod cannot be damped and buffered when the device is subjected to excessive pressure to protect the return spring and extend the service life of the device.

[0005] To solve the above technical problems, the utility model provides the following technical solutions: a hydraulic damping device, comprising an outer shell, a bearing is arranged at the middle position of the top end of the inner part of the outer shell, a piston rod is penetrated inside the bearing, a piston is arranged in the outer shell at the bottom end of the piston rod, a connecting plate is arranged at the top end of the piston rod, a return spring is arranged between the bottom end of the piston and the bottom end of the inner part of the outer shell, an oil seal is arranged between the top end of the outer shell and the outer side of the piston rod, a protective compression spring is arranged on the outer side of the piston rod near the bottom, a gasket is arranged outside the piston rod at the top end of the protective compression spring, and a dustproof component is arranged between the top end of the outer shell and the outer side of the connecting plate.

[0006] As a preferred technical solution of the utility model, the bottom end of the protective compression spring is fixedly connected to the top end of the shell, and the pad is annular.

[0007] As a preferred technical solution of the utility model, an upper support is provided at a middle position of the top end of the connecting plate, and a lower support is provided at a middle position of the bottom end of the shell.

[0008] As a preferred technical solution of the utility model, the oil seal is annular, and the inner side of the oil seal fits with the outer side of the piston rod.

[0009] As a preferred technical solution of the utility model, the dustproof component includes a dustproof rubber sleeve, which is arranged on the outside of the piston rod, a first fixing sleeve is arranged at the top of the outside of the outer shell, a second fixing sleeve is arranged on the outside of the connecting plate, a first connecting sleeve is arranged at the bottom end of the dustproof rubber sleeve, and a second connecting sleeve is arranged at the top of the dustproof rubber sleeve.

[0010] As a preferred technical solution of the utility model, the first connecting sleeve is sleeved on the outside of the first fixed sleeve, the second connecting sleeve is sleeved on the outside of the second fixed sleeve, the inner sides of the first connecting sleeve and the second connecting sleeve are provided with internal threads, and the outer sides of the first fixed sleeve and the second fixed sleeve are provided with external threads matching the internal threads.

[0011] Compared with the prior art, the utility model can achieve the following beneficial effects:

[0012] 1. By arranging an anti-compression protection component on the outside of the piston rod at the top of the housing, when the working piston rod of the device is compressed and retracted to the inside of the housing, the bottom end of the connecting plate contacts the pad, and at the same time compresses the protective compression spring, and the protective compression spring is used for damping and buffering, so as to avoid the hydraulic damping device from working frequently and causing the reset spring to be over-compressed and broken or affecting its reset rebound effect, thereby providing a certain degree of buffering protection for the reset spring, extending the service life of the hydraulic damping device, and having strong feasibility;

[0013] 2. A dustproof component is provided between the top of the outer side of the shell and the outer side of the connecting plate. When in use, the dustproof rubber sleeve is sleeved on the outer side of the piston rod and the first connecting sleeve and the second connecting sleeve are respectively tightened and fixed on the outer sides of the first fixing sleeve and the second fixing sleeve through threaded connection. In this way, the purpose of positioning and installing the dustproof rubber sleeve on the outer side of the piston rod can be achieved. The piston rod is protected from dust by the dustproof rubber sleeve to prevent dust from getting on the piston rod and entering the shell to contaminate the oil as the device is working as it continuously retracts and contracts. At the same time, the wear on the outer side of the piston rod affects the damping and buffering effect of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a front view cross-sectional structural schematic diagram of the utility model;

[0015] Figure 2 It is a front view cross-sectional structural schematic diagram of the utility model;

[0016] Figure 3 For the utility model Figure 2 The enlarged structural diagram at A in the middle;

[0017] Figure 4 It is a schematic diagram of the partial structure of the front section of the utility model.

[0018] Among them: 1. outer shell; 2. first fixed sleeve; 3. first connecting sleeve; 4. dustproof rubber sleeve; 5. upper support; 6. connecting plate; 7. second fixed sleeve; 8. lower support; 9. return spring; 10. piston; 11. piston rod; 12. protective compression spring; 13. second connecting sleeve; 14. gasket; 15. bearing; 16. oil seal. DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, purpose and efficacy of the utility model easy to understand, the utility model is further described below in conjunction with specific embodiments, but the following embodiments are only preferred embodiments of the utility model, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the utility model. The experimental methods in the following embodiments are conventional methods unless otherwise specified, and the materials, reagents, etc. used in the following embodiments are all commercially available unless otherwise specified.

[0020] Example

[0021] Please refer to Figure 1-4As shown, the utility model provides a hydraulic damping device, including a shell 1, a bearing 15 is arranged at the middle position of the top of the shell 1, a piston rod 11 is penetrated inside the bearing 15, a piston 10 is arranged in the shell 1 at the bottom of the piston rod 11, a connecting plate 6 is arranged at the top of the piston rod 11, a reset spring 9 is arranged between the bottom end of the piston 10 and the bottom end of the shell 1, after the pressure on the device is released, the piston rod 11 is pushed by the reset rebound force of the reset spring 9 to drive the device to reset, an annular oil seal 16 is arranged between the top of the shell 1 and the outer side of the piston rod 11, and the inner side of the oil seal 16 is in contact with the outer side of the piston rod 11, and the oil seal 16 prevents the leakage of hydraulic oil in the device, an upper support 5 is arranged at the middle position of the top of the connecting plate 6, and a lower support 8 is arranged at the middle position of the bottom end of the shell 1, and the device is installed on the equipment through the upper support 5 and the lower support 8;

[0022] As a further implementation of this embodiment, Figure 1 , Figure 2 and Figure 3 As shown, a protective compression spring 12 is arranged near the bottom of the outer side of the piston rod 11, and the bottom end of the protective compression spring 12 is fixedly connected to the top end of the housing 1, and an annular pad 14 is arranged outside the piston rod 11 at the top end of the protective compression spring 12. When the device is over-pressurized, the connecting plate 6 presses down the pad 14 and performs damping and buffering through the protective compression spring 12, thereby preventing the hydraulic damping device from working frequently and causing the reset spring 9 to be over-pressurized and broken or affecting its reset rebound effect, so as to achieve the purpose of providing a certain degree of buffering protection for the reset spring 9, prolonging the service life of the hydraulic damping device, and having strong feasibility;

[0023] When the working piston rod 11 of the device is compressed and retracted to the inside of the housing 1, the bottom end of the connecting plate 6 contacts the pad 14, and at the same time compresses the protective compression spring 12, and the protective compression spring 12 is used for damping and buffering, so as to provide a certain degree of buffering protection for the reset spring 9, so as to avoid the reset spring 9 from being over-pressurized and broken or having reduced elasticity due to frequent operation of the hydraulic damping device;

[0024] As a further implementation of this embodiment, Figure 1-4As shown, a dustproof component is arranged between the top of the outer side of the shell 1 and the outer side of the connecting plate 6, and the dustproof component includes a dustproof rubber sleeve 4, which is arranged on the outer side of the piston rod 11, and the piston rod 11 is protected from dust by the dustproof rubber sleeve 4. A first fixing sleeve 2 is arranged on the top of the outer side of the shell 1, and a second fixing sleeve 7 is arranged on the outer side of the connecting plate 6. A first connecting sleeve 3 is arranged on the bottom end of the dustproof rubber sleeve 4, and a second connecting sleeve 13 is arranged on the top end of the dustproof rubber sleeve 4. The first connecting sleeve 3 is sleeved on the outer side of the first fixing sleeve 2, and the second connecting sleeve 13 is sleeved on the outer side of the second fixing sleeve 7. The inner sides of the connecting sleeve 3 and the second connecting sleeve 13 are provided with internal threads, and the outer sides of the first fixing sleeve 2 and the second fixing sleeve 7 are provided with external threads matching the internal threads. The first connecting sleeve 3 and the second connecting sleeve 13 are screwed and fixed to the outer sides of the first fixing sleeve 2 and the second fixing sleeve 7 through threaded connection, so as to achieve the purpose of positioning and installing the dustproof rubber sleeve 4 on the outer side of the piston rod 11, thereby effectively preventing dust from getting on the piston rod 11 and contaminating the oil as it continuously expands and contracts when the device is working, and at the same time preventing the outer side of the piston rod 11 from being worn and affecting the damping and buffering effect of the device;

[0025] When in use, the dustproof rubber sleeve 4 is sleeved on the outer side of the piston rod 11, and the first connecting sleeve 3 and the second connecting sleeve 13 are respectively screwed and fixed on the outer sides of the first fixing sleeve 2 and the second fixing sleeve 7 through threaded connection, so that the dustproof rubber sleeve 4 is positioned and installed on the outer side of the piston rod 11, and the piston rod 11 is protected from dust by the dustproof rubber sleeve 4, so as to prevent dust from getting on the piston rod 11 and entering the housing 1 to pollute the oil and wear and damage the outer wall of the piston rod 11 as the device is working;

[0026] Specific working principle:

[0027] When using the hydraulic damping device, firstly, the dustproof rubber sleeve 4 is sleeved on the outside of the piston rod 11 and the first connecting sleeve 3 and the second connecting sleeve 13 are respectively screwed and fixed on the outside of the first fixing sleeve 2 and the second fixing sleeve 7 through threaded connection, so that the dustproof rubber sleeve 4 is positioned and installed on the outside of the piston rod 11, and the device is installed through the upper support 5 and the lower support 8. When the mechanical equipment is subjected to vibration or pressure, the piston rod 11 is compressed and retracted into the housing 1 and the return spring 9 is used for buffering and shock absorption. When the device is over-pressurized, the connecting plate 6 presses down the pad 14 and passes through the protective The compression spring 12 performs damping and buffering to provide a certain degree of buffering protection for the reset spring 9 to prevent it from breaking or reducing its elasticity. When the pressure on the device is released, the reset rebound force of the reset spring 9 pushes the piston rod 11 to reset the device. When the device is working, the oil seal 16 is used to prevent the leakage of hydraulic oil in the device. When the device is working, the dustproof rubber sleeve 4 is used to protect the piston rod 11 from dust, so as to prevent dust from getting on the piston rod 11 and entering the housing 1 as it continues to expand and contract when the device is working, thereby ensuring that the device can safely and stably reduce the impact force on the mechanical equipment.

[0028] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A hydraulic damping device, comprising a housing (1), characterized in that: A bearing (15) is arranged at the middle position of the top end of the housing (1), a piston rod (11) is passed through the interior of the bearing (15), a piston (10) is arranged in the housing (1) at the bottom end of the piston rod (11), a connecting plate (6) is arranged at the top end of the piston rod (11), a return spring (9) is arranged between the bottom end of the piston (10) and the bottom end of the housing (1), an oil seal (16) is arranged between the top end of the housing (1) and the outer side of the piston rod (11), a protective compression spring (12) is arranged at a position near the bottom of the outer side of the piston rod (11), a gasket (14) is arranged outside the piston rod (11) at the top end of the protective compression spring (12), and a dustproof component is arranged between the top end of the outer side of the housing (1) and the outer side of the connecting plate (6).

2. A hydraulic damping device according to claim 1, characterized in that: The bottom end of the protective compression spring (12) is fixedly connected to the top end of the housing (1), and the pad (14) is annular.

3. A hydraulic damping device according to claim 1, characterized in that: An upper support (5) is provided at the middle position of the top end of the connecting plate (6), and a lower support (8) is provided at the middle position of the bottom end of the housing (1).

4. A hydraulic damping device according to claim 1, characterized in that: The oil seal (16) is annular, and the inner side of the oil seal (16) fits the outer side of the piston rod (11).

5. A hydraulic damping device according to claim 1, characterized in that: The dustproof assembly comprises a dustproof rubber sleeve (4), wherein the dustproof rubber sleeve (4) is arranged on the outer side of the piston rod (11), a first fixing sleeve (2) is arranged on the top end of the outer side of the outer shell (1), a second fixing sleeve (7) is arranged on the outer side of the connecting plate (6), a first connecting sleeve (3) is arranged on the bottom end of the dustproof rubber sleeve (4), and a second connecting sleeve (13) is arranged on the top end of the dustproof rubber sleeve (4).

6. A hydraulic damping device according to claim 5, characterized in that: The first connecting sleeve (3) is sleeved on the outer side of the first fixing sleeve (2), and the second connecting sleeve (13) is sleeved on the outer side of the second fixing sleeve (7). The inner sides of the first connecting sleeve (3) and the second connecting sleeve (13) are provided with internal threads, and the outer sides of the first fixing sleeve (2) and the second fixing sleeve (7) are provided with external threads matching the internal threads.

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