A double rod type cement buffer

Abstract

The present application relates to a kind of double-out-rod type cement buffers, belong to buffer technical field, solve the problem that double-out-rod type cement buffer in prior art is insufficient in stability and reliability when being subjected to greater impact force, it is difficult to meet the requirements.The present application includes cylinder, guide centering assembly, piston assembly and chamber;Guide centering assembly includes front end cover and rear end cover;Cylinder and front end cover and rear end cover form chamber;Piston assembly includes piston and piston rod;Piston separates chamber into first chamber and second chamber;Piston rod can move along its own axis. First chamber and second chamber are provided with cement, and the edge of piston and the inner wall of cylinder form a throttling gap, and the cement can flow between the first chamber and the second chamber through the throttling gap.The present application can keep the buffer stable and reliable when subjected to greater impact force.

Description

Technical Field

[0001] This invention relates to the field of buffer technology, and more particularly to a double-outlet rod type clay buffer. Background Technology

[0002] The primary function of a dual-pole type clay damper is to buffer and absorb impact energy. Clay material possesses unique viscoelasticity; when subjected to impact, it deforms. This deformation is an energy absorption process, converting the kinetic energy generated by the impact into the elastic potential energy and viscous dissipation energy of the clay. Compared to traditional spring dampers, the dual-pole type clay damper provides a smoother buffering process and is therefore widely used in industrial production, national defense, and vehicle transportation.

[0003] Currently, for some devices that operate in harsh environments, the buffers are not stable or reliable enough when subjected to large impact forces, making it difficult to meet their stringent requirements for buffering performance. Summary of the Invention

[0004] Based on the above analysis, the present invention aims to provide a dual-rod type clay buffer to solve the problem that the existing dual-rod type clay buffer has insufficient stability and reliability when subjected to large impact forces, making it difficult to meet the strict requirements for buffering performance.

[0005] The objective of this invention is mainly achieved through the following technical solutions:

[0006] A dual-rod type putty damper includes a cylinder, a guide centering assembly, a piston assembly, and a chamber;

[0007] The guide centering assembly includes a front cover and a rear cover; the cylinder forms a chamber with the front cover and the rear cover;

[0008] The piston assembly includes a piston and a piston rod; the piston divides the chamber into a first chamber and a second chamber; the piston rod is movable along its own axis;

[0009] The first chamber and the second chamber are provided with putty, and a throttling gap is formed between the edge of the piston and the inner wall of the cylinder, through which the putty can flow between the first chamber and the second chamber.

[0010] Furthermore, the piston rod has a hollow structure.

[0011] Furthermore, a first chamber is formed between the front end cover, the piston, and the cylinder; a second chamber is formed between the rear end cover, the piston, and the cylinder.

[0012] Furthermore, the guide centering assembly also includes a guide sleeve, which is disposed between the front end cover, the rear end cover, and the cylinder.

[0013] Furthermore, the piston rod and the piston are connected by a threaded connection.

[0014] Furthermore, it also includes a putty assembly; the putty assembly includes a putty injection port and a one-way valve.

[0015] Furthermore, the one-way valve is disposed in the putty injection hole, and the one-way valve is used to prevent the putty from flowing out; the one-way valve includes a limit block, a steel ball and a spring.

[0016] Furthermore, the pressure port is provided on the side of the cylinder barrel, and the pressure port is used to pressurize and depressurize the inside of the cylinder barrel.

[0017] Furthermore, it also includes a sealing assembly; the sealing assembly includes a front dynamic seal, a rear dynamic seal, a front retaining ring, and a rear retaining ring.

[0018] Furthermore, it also includes an impact head, which is disposed at the end of the piston rod.

[0019] Furthermore, the piston rod, the front end cap, the piston, and the rear end cap are coaxially arranged.

[0020] Furthermore, the piston rod passes through the front end cover and the rear end cover; the piston rod can extend out of the front end cover and the rear end cover; the first chamber and the second chamber are rod-type chambers.

[0021] Furthermore, the inner wall profile curve of the cylinder is defined by the following formula:

[0022]

[0023] Where v is the instantaneous velocity of the piston rod, m / s; v0 is the initial velocity of the piston rod, m / s; x is the displacement of the piston rod, m; S is the maximum stroke of the piston rod, m; and A0 is the effective area of ​​the piston rod, m². 2 ; δ is the damping gap height, m; D is the cylinder inner diameter, m; ΔP is the pressure difference between the two ends of the piston, Pa; B is the circumference of the damping ring gap, m; μ is the dynamic viscosity, Pa·s; L is the piston thickness, m.

[0024] Furthermore, the piston has a spiral structure on its exterior, which is used to work in conjunction with the putty medium to increase the damping effect.

[0025] Furthermore, the helix angle of the spiral structure is 10°-20°, and the pitch is 5mm-10mm.

[0026] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0027] (1) In this invention, the piston rod can move along its own axis in the front end cover and the rear end cover. The putty is disposed in the first chamber and the second chamber separated by the piston, and is used to convert the impact kinetic energy of the piston rod into frictional heat energy and elastic potential energy.

[0028] (2) In this invention, the piston rod has a hollow structure, which reduces weight. In this invention, the piston rod and the piston are connected by a thread, which facilitates replacement and maintenance.

[0029] (3) The one-way valve includes a limiting block, a steel ball, and a spring. When the putty is injected from the putty injection hole, the internal pressure acts on the steel ball, and the steel ball fits tightly against the outflow port of the limiting block, preventing the putty from flowing out and improving the injection efficiency of the putty.

[0030] (4) In this invention, the pressure hole pressurizes the interior of the buffer, compressing the clay to a certain proportion in its initial state, giving it a certain elastic force. Because the piston rod diameter at the rear end of the piston is smaller than that at the front end, the contact area between the clay and the piston is larger at the rear and smaller at the front. Under the same internal pressure, the elastic force at the rear end of the piston is always greater than that at the front, ensuring effective rebound of the piston rod. When the double-rod type clay buffer needs to be disassembled, pressure can be released through the clay pressure hole, improving the safety of disassembly.

[0031] (5) The piston rod in this invention is a double-outlet type, which has a compact structure, solves the problem of limited installation size, and effectively improves the buffer capacity. Compared with the single-outlet type, the piston rod can avoid eccentricity by fixing it with the guide centering structure at both ends, and has higher working stability when bearing lateral loads.

[0032] (6) Compared with the prior art, the present invention adopts a variable throttling gap area structure, that is, the diameter of the piston does not change, and the inner wall profile of the cylinder is designed as a curve that changes with the piston stroke, so that the hydraulic buffer can provide constant pressure. By changing the inner wall profile curve of the cylinder, the gap between the inner wall of the cylinder and the piston is changed in real time, thereby adjusting the pressure peak in the chamber, so that the buffer can make the buffer force uniform even under a large impact force, and the operation is stable and reliable.

[0033] (7) The piston of the present invention has a spiral structure on its exterior. The spiral structure has spiral grooves, which can increase the contact area with the clay medium, and increase the damping effect in conjunction with the clay medium through its own torsion and bending shape. When the flowability of the viscoelastic clay medium is weak, and the clay has difficulty passing through the gap between the spiral piston and the cylinder, the spiral piston end face compresses the clay material to generate a large elastic force to achieve buffering. When the flowability of the clay is strong, the clay material generates a large viscous damping force when passing through the gap between the spiral piston and the cylinder to achieve buffering. Compared with the prior art, the piston of the present invention is set with a spiral structure on its exterior, which enhances the overall buffering and shock absorption effect of the damper. The elasticity of the clay medium and the spiral structure work together, and the clay medium provides additional elastic support and buffering on the basis of the spiral structure, which can better absorb and dissipate external energy and improve the stability and reliability of the damper.

[0034] (8) The helix angle of the spiral structure of the present invention is 10°-20°, and the pitch is 5mm-10mm, which can reduce the peak value of the impact force and make the buffering process smoother. When the helix angle is small, the tangential component force is relatively small, which is beneficial to make the spiral structure deform in an axial compression manner when subjected to impact, and to make more effective use of the axial buffering performance of the elastic medium. The smaller the pitch, the greater the elastic performance and buffering performance; if the pitch is too small, the elastic deformation space of the putty medium is limited.

[0035] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the specification or be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained from the content specifically pointed out in the text and accompanying drawings. Attached Figure Description

[0036] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0037] Figure 1 This is a schematic diagram of a double-rod type clay buffer.

[0038] Figure 2 This is a cross-sectional schematic diagram of a double-pole type putty buffer;

[0039] Figure 3 This is a schematic diagram of a helical piston rod;

[0040] Figure 4 This is a schematic diagram of a check valve;

[0041] Figure 5 This is a schematic diagram of the sealing assembly.

[0042] Figure label:

[0043] 1-Cylinder, 2-Guide centering assembly, 201-Front end cover, 202-Rear end cover, 203-Guide sleeve, 2031-Front guide sleeve, 2032-Rear guide sleeve, 3-Piston assembly, 301-Piston, 302-Piston rod, 4-Cavity, 401-First chamber, 402-Second chamber, 5-Plaster assembly, 501-Plaster injection hole, 502-One-way valve, 5021-Limit block, 5022-Steel ball, 5023-Spring, 6-Sealing assembly, 601-Front dynamic seal, 602-Rear dynamic seal, 603-Front retaining ring, 604-Rear retaining ring, 7-Pressure hole, 8-Impact head, 9-Flange connector. Detailed Implementation

[0044] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0045] A specific embodiment of the present invention, such as Figure 1 and Figure 2 As shown, a dual-rod type clay buffer is disclosed, including a cylinder 1, a guide centering assembly 2, a piston assembly 3, and a chamber 4.

[0046] Cylinder 1 is positioned in the middle of the buffer.

[0047] The guide centering assembly 2 includes a front cover 201, a rear cover 202, and a guide sleeve 203. The front cover 201 and rear cover 202 are respectively installed at both ends of the cylinder 1 to seal the cylinder 1. Exemplarily, threaded holes are provided at both ends of the cylinder 1, which are connected to the front cover 201 and rear cover 202 respectively by screws. A piston rod 302 passes through the middle of the front cover 201 and rear cover 202, and the piston rod 302 is movable along its own axis within the front cover 201 and rear cover 202. Grooves are respectively provided in the middle of the opposite end faces of the front cover 201 and rear cover 202 for installing the sealing assembly 6 and the guide assembly.

[0048] The guide sleeve 203 includes a front guide sleeve 2031 and a rear guide sleeve 2032, which are used to guide the axial movement of the piston rod 302 and provide support for the piston rod 302. The front guide sleeve 2031 is disposed between the front end cover 201 and the piston rod 302, and the rear guide sleeve 2032 is disposed between the rear end cover 202 and the piston rod 302.

[0049] The piston assembly 3 includes a piston 301 and a piston rod 302.

[0050] Piston 301 is positioned in the middle of cylinder 1, dividing cylinder 1 into two chambers 4. Specifically, cylinder 1, front end cap 201, and piston 301 form the first chamber 401, and cylinder 1, rear end cap 202, and piston 301 form the second chamber 402. When the buffer is in operation, the first chamber 401 and the second chamber 402 are filled with putty to convert the impact kinetic energy of piston rod 302 into frictional heat energy and elastic potential energy.

[0051] An annular gap, serving as a throttling gap, is formed between the inner wall of cylinder 1 and piston 301, allowing the mortar medium to flow between the first chamber 401 and the second chamber 402. The size of the throttling gap determines the pressure and buffering force in chamber 4. To ensure smooth operation and high buffering efficiency, this embodiment features a variable profile curve on the inner wall of cylinder 1, which dynamically adjusts the gap between the inner wall of cylinder 1 and piston 301, thereby regulating the peak pressure within chamber 4.

[0052] Specifically, the inner wall profile curve of cylinder 1 is defined by the following formula:

[0053]

[0054] Where v is the instantaneous velocity of piston rod 302, m / s; v0 is the initial velocity of piston rod 302, m / s; x is the displacement of piston rod 302, m; S is the maximum stroke of piston rod 302, m; and A0 is the effective area of ​​piston rod 302, m². 2 ; δ is the damping gap height, m; D is the inner diameter of cylinder 1, m; ΔP is the pressure difference between the two ends of piston 301, Pa; B is the circumference of the damping ring gap, m; μ is the dynamic viscosity, Pa·s; L is the thickness of the piston, m.

[0055] Based on the parallel plate slit flow equation, the instantaneous flow rate of the medium flowing through the throttling gap between the piston and cylinder under a certain pressure difference is: According to the continuity equation Q = vA, the flow rate acting on the effective cross-sectional area of ​​the piston when the piston rod displacement is x is: Since the two are equal, we arrive at the first formula.

[0056] The inner diameter D of cylinder 1 and the throttling clearance δ have the following relationship:

[0057] Based on the above formula, the relationship between the displacement x of piston rod 302 and the inner diameter D of cylinder 1 can be obtained:

[0058]

[0059] The displacement x of piston rod 302 and the inner diameter D of cylinder 1 satisfy the above formula, which can stabilize the internal pressure difference.

[0060] Compared with the prior art, in this embodiment, the inner diameter D of the cylinder 1 is changed, so the throttling gap between the piston 301 and the cylinder 1 is variable, that is, the diameter of the piston 301 does not change. The inner wall profile of the cylinder 1 is designed as a curve that changes with the stroke of the piston 301. By changing the inner wall profile curve of the cylinder 1, the gap between the inner wall of the cylinder 1 and the piston 301 is changed in real time, thereby adjusting the pressure peak in the chamber 4, so that the buffer can make the buffering force uniform even under a large impact force, and the operation is stable and reliable.

[0061] Furthermore, such as Figure 3 As shown, the piston 301 has a spiral structure with spiral grooves on its exterior. The spiral groove structure increases the contact area with the clay medium, absorbs energy through its own deformation, and stores elastic potential energy through bending and torsion, thus mitigating external impacts. The spiral groove structure can more effectively work in conjunction with the clay to achieve a buffering effect. On the one hand, when the viscoelastic clay medium has weak flowability and the clay has difficulty passing through the gap between the spiral piston 301 and the cylinder 1, the end face of the spiral piston 301 compresses the clay, generating a large elastic force to achieve rebound and buffering. On the other hand, when the clay has strong flowability, the clay material generates a large viscous damping force when passing through the gap between the spiral piston 301 and the cylinder 1, achieving buffering.

[0062] Compared to existing technologies, the piston 301 in this embodiment has an external spiral structure. The deformation of the spiral structure under stress allows the impact energy to be dispersed and dissipated over a longer period and over a larger spatial range, enhancing the overall buffering and shock absorption effect of the damper. The elasticity of the putty medium and the spiral structure work together, with the putty medium providing additional elastic support and buffering on the basis of the spiral structure, which can better absorb and dissipate external energy, improving the stability and reliability of the damper.

[0063] The parameters of the helical structure give the buffer different cushioning characteristics. A smaller helix angle results in a relatively smaller tangential force, which is beneficial for the helical structure to deform axially under impact, thus more effectively utilizing the axial cushioning performance of the elastic medium. A smaller pitch results in greater elasticity and cushioning performance; however, an excessively small pitch limits the elastic deformation space of the clay medium. Preferably, a helix angle of 10°-20° and a pitch of 5mm-10mm can reduce the peak impact force and make the cushioning process smoother.

[0064] The piston rod 302 passes through the middle of the piston 301. Furthermore, the piston rod 302 has a hollow structure, which reduces weight. The piston rod 302 is a double-outlet type, meaning that both ends of the piston rod 302 extend out of the piston 301. The two piston rods 302 pass through the centers of the front end cover 201 and the rear end cover 202, respectively, and can extend out of the spaces contained within the front end cover 201 and the rear end cover 202. Therefore, both chambers 4 are rod chambers. In this embodiment, the piston rod 302 is a double-outlet type, with a compact structure, solving the problem of limited installation size and effectively improving the buffer capacity. Compared to a single-outlet type, the fixing of the two-end guide centering structure avoids the eccentricity of the piston rod 302, resulting in higher working stability when bearing lateral loads.

[0065] Specifically, the outer wall of the piston rod 302 has a stepped structure, including a first section, a second section, and a third section. The outer diameter of the first section is smaller than that of the second section, and the outer diameter of the second section is smaller than that of the third section. The first section is fitted with a rear end cover 202, the second section is fitted with a piston 301, and the third section is fitted with a front end cover 201.

[0066] Furthermore, the piston rod 302 and the piston 301 are connected by a thread, which facilitates replacement and maintenance.

[0067] Furthermore, it also includes a putty injection assembly 5. The putty injection assembly 5 includes a putty injection hole 501 and a one-way valve 502. The putty injection hole 501 is disposed on the rear end cover 202 and includes a first part and a second part, which are connected. The first part is disposed along the axial direction of the rear end cover 202, and the length direction of the second part is perpendicular to the length direction of the first part. The end of the second part is located on the side wall of the rear end cover 202, and the one-way valve 502 is disposed inside it.

[0068] like Figure 4 As shown, the one-way valve 502 includes a limit block 5021, a steel ball 5022, and a spring 5023. When the putty is injected from the putty injection hole 501, due to the internal pressure acting on the steel ball 5022, the steel ball 5022 is tightly fitted with the outflow port of the limit block 5021, preventing the putty from flowing out and improving the injection efficiency of the putty.

[0069] Furthermore, it also includes a sealing assembly 6 to prevent the adhesive medium from leaking from the gap between the piston rod 302 and the front cover 201 or the rear cover 202. Figure 5As shown, the sealing assembly 6 includes a front dynamic seal 601, a rear dynamic seal 602, a front retaining ring 603, and a rear retaining ring 604. The front dynamic seal 601 is disposed between the front end cover 201 and the piston rod 302, with the front guide sleeve 2031 near the end face of the front end cover 201. The rear dynamic seal 602 is disposed between the rear end cover 202 and the piston rod 302, with the rear guide sleeve 2032 near the end face of the rear end cover 202. The front retaining ring 603 is disposed between the outer wall of the front end cover 201 and the cylinder 1, and the rear retaining ring 604 is disposed between the outer wall of the rear end cover 202 and the cylinder 1. The front retaining ring 603 and the rear retaining ring 604 axially fix the front dynamic seal 601 and the rear dynamic seal 602, preventing the seals from being extruded.

[0070] Furthermore, it also includes a pressure port 7, which is located on the side of the cylinder 1 and is used for pressurizing and depressurizing the inside of the cylinder 1. The pressure port 7 has an internal thread and can be connected to external pressurization and depressurization equipment via bolts. After pressurizing the inside of the double-rod type clay buffer, the clay can be compressed to a certain proportion in its initial state, giving it a certain elastic force. Because the diameter of the piston rod 302 at the rear end of the piston 301 is smaller and the diameter at the front end is larger, the contact area between the clay and the piston 301 is larger at the rear end and smaller at the front end. Under the same internal pressure, the elastic force at the rear end of the piston 301 is always greater than that at the front end, ensuring the effective rebound of the piston rod 302. When it is necessary to disassemble the double-rod type clay buffer, the pressure can be released through the pressure port 7, improving the safety of disassembly.

[0071] Furthermore, it also includes an impact head 8, which is disposed at the end of the piston rod 302. When an external force impacts, the impact head 8 is impacted first, and then the force is transmitted to the piston rod 302 and the piston 301.

[0072] Furthermore, the buffer also includes a flange connector 9 for mounting the buffer to the equipment. The flange connector 9 is fixedly mounted to the rear cylinder head, and a through hole is provided in the middle of the flange connector 9. The piston rod 302, which passes through the second chamber 402, can pass through the through hole during operation to achieve a larger stroke and improve the buffer capacity.

[0073] The above are specific embodiments of the present invention. The specific usage method of this embodiment is as follows:

[0074] Heated putty medium is injected through one-way valve 503. After cooling, the putty medium is pressurized through pressurization port 7 to reach the preset pressure. When the buffer is impacted, the impact head 8 is impacted and transmits the force to piston rod 302, and then to piston 301. The impact energy is absorbed by the elastic force generated by the compression of the putty medium by the spiral piston 301 and the viscous damping force generated by the throttling gap between the spiral piston 301 and cylinder 1. On the one hand, the piston 301 compresses the putty, causing it to generate elastic force; on the other hand, the putty flows from the second chamber 402 to the first chamber 401 through the spiral gap between the spiral piston 301 and cylinder 1, generating viscous damping force between the putty and piston 301, thus achieving a buffering effect. After buffering is complete, the elastic force generated by the compression of the putty causes piston rod 302 to return to its original position. Due to the curved design of cylinder 1, the double-rod putty buffer in this embodiment can achieve smooth buffering, improving the buffering efficiency and reliability of the buffer.

[0075] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A double-rod type clay buffer, characterized in that, It includes a cylinder (1), a guide centering assembly (2), a piston assembly (3), and a chamber (4); The guide centering assembly (2) includes a front cover (201) and a rear cover (202); the cylinder (1) forms a chamber (4) with the front cover (201) and the rear cover (202); The piston assembly (3) includes a piston (301) and a piston rod (302); the piston (301) divides the chamber (4) into a first chamber (401) and a second chamber (402); the piston rod (302) is capable of moving along its own axis; The first chamber (401) and the second chamber (402) are provided with putty, and a throttling gap is formed between the edge of the piston (301) and the inner wall of the cylinder (1), and the putty can flow between the first chamber (401) and the second chamber (402) through the throttling gap.

2. The double-rod type clay buffer according to claim 1, characterized in that, The piston rod (302) has a hollow structure.

3. The double-rod type clay buffer according to claim 1, characterized in that, A first chamber (401) is formed between the front end cover (201), the piston (301) and the cylinder (1); a second chamber (402) is formed between the rear end cover (202), the piston (301) and the cylinder (1).

4. The double-rod type putty buffer according to claim 1, characterized in that, The guide centering assembly (2) further includes a guide sleeve (203), which is disposed between the front end cover (201) and the rear end cover (202) and the cylinder (1).

5. The double-rod type putty buffer according to claim 1, characterized in that, The piston rod (302) and the piston (301) are connected by a threaded connection.

6. The double-rod type putty buffer according to claim 1, characterized in that, It also includes a putty assembly (5); the putty assembly (5) includes a putty injection hole (501) and a one-way valve (502).

7. The double-rod type putty buffer according to claim 6, characterized in that, The one-way valve (502) is disposed in the putty injection hole (501) and is used to prevent the putty from flowing out. The one-way valve (502) includes a limiting block (5021), a steel ball (5022) and a spring (5023).

8. The double-rod type putty buffer according to claim 6, characterized in that, The pressure hole (7) is provided on the side of the cylinder (1), and the pressure hole (7) is used to pressurize and depressurize the inside of the cylinder (1).

9. The double-rod type clay buffer according to claim 1, characterized in that, It also includes a sealing assembly (6); the sealing assembly (6) includes a front dynamic seal (601), a rear dynamic seal (602), a front retaining ring (603) and a rear retaining ring (604).

10. The double-rod type putty buffer according to claim 1, characterized in that, It also includes an impact head (8) disposed at the end of the piston rod (302).

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