Titanium alloy lifting cylinder

Abstract

The utility model discloses a titanium alloy lift cylinder which comprises a cylinder body, a piston rod and a fuel gas generator located in the cylinder body, a cavity is formed in the cylinder body, the fuel gas generator divides the cavity into a rod cavity and a rodless cavity, one end of the piston rod stretches into the rod cavity to be connected with the fuel gas generator, and the other end of the piston rod stretches into the rodless cavity to be connected with the rodless cavity. The piston rod is a hollow pipe, the portion, extending into the cylinder body, of the piston rod is provided with a vent hole, and the vent hole enables an outlet of the gas generator to be communicated with the rod cavity through the piston rod. The cylinder body and the piston rod are both made of titanium alloy materials, and the wall thickness of the cylinder body and the wall thickness of the piston rod are both 3-3.5 mm. A traditional metal iron lifting cylinder is improved into a titanium alloy lifting cylinder which is light in weight, high in strength and resistant to corrosion, so that the thickness of components can be reduced, cost increase is reduced as much as possible, the overall weight of the lifting cylinder is greatly reduced, the procedure of coating an anticorrosive coating is omitted, and the manufacturing procedure is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of special equipment, in particular to a titanium alloy lifting cylinder, which is mainly used in special working conditions such as aerospace, rail transportation and the like. Background Art

[0002] A lifting cylinder is a pneumatic cylinder that rapidly retracts a piston rod to rapidly lift moving parts. A gas generator is typically used to generate instantaneous high pressure, facilitating rapid piston rod movement. Existing lifting cylinders are typically made of relatively inexpensive iron. However, iron is heavy and not very hard, resulting in a thick cylinder wall (often around 10 mm). This results in a relatively heavy overall weight, which does not meet the lightweighting requirements of aerospace products. This results in a limited range of applications or a short service life. Furthermore, iron has weak corrosion resistance, requiring a surface coating for corrosion protection, which increases costs and the number of manufacturing steps. Furthermore, in existing lifting cylinders, the piston rod retracts only by a hard collision between the piston rod and the cylinder body, resulting in a loud noise at the end of the stroke, and the moving parts also experience structural deformation due to the large inertia. Utility Model Content

[0003] In order to solve the technical problem that the lifting cylinder in the existing technology is heavy in overall weight, does not meet the requirements of lightweight products in the aerospace field, and has a small scope of application, the utility model provides a titanium alloy lifting cylinder to solve the above problem.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a titanium alloy pulling cylinder, including a cylinder body, a piston rod and a gas generator located in the cylinder body, a cavity is provided inside the cylinder body, the gas generator divides the cavity into a rod cavity and a rodless cavity, one end of the piston rod extends into the rod cavity and is connected to the gas generator, one end of the cylinder body where the rodless cavity is located has an air outlet, the piston rod is a hollow tube, the part of the piston rod extending into the cylinder body has an air vent, the air vent connects the outlet of the gas generator with the rod cavity through the piston rod; the cylinder body and the piston rod are both made of titanium alloy material, and the wall thickness is 3mm to 3.5mm.

[0005] Furthermore, a brake cone is fixed to the outer peripheral surface of one end of the piston rod away from the cylinder body. The brake cone is made of stainless steel. When the piston rod is retracted into the cylinder body, the brake cone can abut against the outer end surface of the cylinder body.

[0006] Furthermore, the titanium alloy pulling cylinder also includes a buffer nut threadedly connected to the end of the piston rod, one end of the buffer nut has a crimping portion, the outer diameter of the brake cone gradually decreases from the end close to the cylinder body to the end away from the cylinder body, and the smaller diameter end of the brake cone is pressed between the crimping portion and the piston rod.

[0007] Furthermore, the cylinder body includes an axially penetrating cylinder barrel and a cylinder cover and a cylinder bottom sealed at both ends of the cylinder barrel. The air outlet is located on the cylinder bottom, and the piston rod passes through the cylinder cover and extends into the cylinder barrel.

[0008] Furthermore, a buffer spring is sleeved on the piston rod located inside the cylinder body.

[0009] Furthermore, a sealing groove is provided on the outer peripheral surface of the piston rod inside the crimping portion, and a sealing ring is filled in the sealing groove, which seals the radial gap between the brake cone and the piston rod.

[0010] Furthermore, the buffer nut is made of titanium alloy.

[0011] Furthermore, a fixing ring is interference-fitted on the outer circumference of the cylinder body. The fixing ring has a laterally extending lug. The fixing ring is made of titanium alloy, and the thickness of the annular portion of the fixing ring is 3mm to 4mm.

[0012] Furthermore, one side of the fixing ring is provided with a horizontal mounting plate, two ends of the horizontal mounting plate form supporting ears, and the two supporting ears are respectively provided with mounting holes.

[0013] The beneficial effects of the utility model are:

[0014] (1) The titanium alloy lifting cylinder described in the present invention improves the traditional metal iron lifting cylinder into a titanium alloy lifting cylinder that is light in weight, high in strength and corrosion-resistant, thereby reducing the thickness of the components, minimizing the increase in costs, and significantly reducing the overall weight of the lifting cylinder. It also eliminates the process of coating the anti-corrosion layer, reducing the number of manufacturing steps.

[0015] (2) The titanium alloy lifting cylinder described in the present invention has a brake cone made of stainless steel installed at the end of the piston rod. When the piston rod is about to be fully retracted, the brake cone collides with the cylinder body and deforms until the piston rod stops moving, thereby achieving buffering of the retraction movement and avoiding damage to the moving parts caused by excessive inertia force. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is a front view of a specific embodiment of the titanium alloy pulling cylinder described in the present invention (partially omitted);

[0018] Figure 2 This is an axial cross-sectional view of the titanium alloy lifting cylinder described in the present invention;

[0019] Figure 3 yes Figure 2 Enlarged view of point a in the middle;

[0020] Figure 4 yes Figure 2 Enlarged view of point b in the middle.

[0021] In the figure, 1, cylinder body, 101, cylinder barrel, 102, cylinder head, 103, cylinder bottom, 2, piston rod, 3, rod chamber, 4, rodless chamber, 5, air outlet, 6, vent, 7, buffer spring, 8, fixing ring, 801, horizontal mounting plate, 802, mounting hole, 9, brake cone, 10, buffer nut, 1001, crimping part, 11, sealing groove, 12, gas generator. DETAILED DESCRIPTION

[0022] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0023] Example 1

[0024] like Figure 1-Figure 3 As shown, a titanium alloy pulling cylinder includes a cylinder body 1, a piston rod 2 and a gas generator 12 located in the cylinder body 1. A cavity is provided inside the cylinder body 1, and the gas generator 12 divides the cavity into a rod cavity 3 and a rodless cavity 4. One end of the piston rod 2 extends into the rod cavity 3 and is connected to the gas generator 12. One end of the cylinder body 1 where the rodless cavity 4 is located has an air outlet 5, and the piston rod 2 is a hollow tube. The part of the piston rod 2 extending into the cylinder body 1 has an air vent 6, and the air vent 6 connects the outlet of the gas generator 12 with the rod cavity 3 through the piston rod 2; the cylinder body 1 and the piston rod 2 are both made of titanium alloy material, and the wall thickness is 3mm to 3.5mm.

[0025] Under normal conditions, the piston rod 2 is in an extended state. When the lifting cylinder needs to be activated, the gas generator 12 is ignited. The high-pressure gas generated by the gas generator 12 enters the rod chamber 3 through the center of the piston rod 2 and the vent 6, pushing the gas generator 12 to quickly squeeze toward the rodless chamber 4, thereby causing the piston rod 2 to retract. The cylinder body 1 and piston rod 2 are made of a high-strength, corrosion-resistant, and lightweight titanium alloy, which can greatly reduce the weight of the lifting cylinder and eliminate the need for an anti-corrosion coating. Due to the high price of titanium alloy, in order to minimize costs, it is necessary to reasonably set the wall thickness of the cylinder body 1 and piston rod 2 to ensure strength while minimizing costs. It has been verified that when the wall thickness is between 3mm and 3.5mm, taking into account the material and all process costs, the cost increase can be within 5%, while the mass reduction can reach more than 60%, and the strength is significantly improved (can withstand a pressure of 35MPa), making it suitable for occasions with higher lightweight and pressure requirements.

[0026] Preferably, a buffer spring 7 is provided on the piston rod 2 inside the cylinder body 1. The buffer spring 7 prevents the gas generator 12 from colliding with the end face of the cylinder body 1 when the piston rod 2 reaches the initial state, and also allows the rod cavity 3 to have a certain initial space.

[0027] The cylinder body 1 may include, but is not limited to, an axially extending cylinder barrel 101, a cylinder cover 102 and a cylinder bottom 103 sealing both ends of the cylinder barrel 101, an air outlet 5 being located on the cylinder bottom 103, and a piston rod 2 extending through the cylinder cover 102 into the cylinder barrel 101. The cylinder cover 102 and the cylinder bottom 103 are threadedly connected to the cylinder barrel 101 for easy assembly and disassembly.

[0028] The lifting cylinder needs to be fixed to the frame. Preferably, the outer peripheral surface of the cylinder body 1 is interference-fitted with a fixing ring 8, and the fixing ring 8 has a laterally extending lug. The fixing ring 8 is made of titanium alloy, and the thickness of the annular portion of the fixing ring 8 is 3mm to 4mm. Like the cylinder body 1 and the piston rod 2, the fixing ring 8 is also made of titanium alloy, and the thickness of the fixing ring 8 is reduced to save costs. In a further design, a horizontal mounting plate 801 is provided on one side of the fixing ring 8, and lugs are formed at both ends of the horizontal mounting plate 801. Mounting holes 802 are respectively provided on the two lugs. The flat end of the horizontal mounting plate 801 can be used as a positioning surface, and the fixing ring 8 is fixed to the frame through the mounting holes 802.

[0029] Example 2

[0030] In the first embodiment, when the piston rod 2 is quickly retracted to the end of the stroke, the piston rod 2 will collide with the end of the cylinder body 1, causing collision noise and generating a large inertial force. The moving parts connected to the piston rod 2 are prone to structural deformation. Therefore, this embodiment makes the following improvements on the basis of the first embodiment. Figure 4 As shown, a brake cone 9 is fixed to the outer circumference of the end of the piston rod 2 away from the cylinder body 1. The brake cone 9 is made of stainless steel. When the piston rod 2 is retracted into the cylinder body 1, the brake cone 9 can contact the outer end surface of the cylinder body 1. The brake cone 9 is used to deform when the piston rod 2 collides with the cylinder body 1 at the end of its stroke, thereby providing a buffer and preventing sudden changes in the speed of the piston rod 2. Because the brake cone 9 is made of relatively weak stainless steel, the piston rod 2 and cylinder body 1 can still maintain structural stability when the brake cone 9 deforms.

[0031] The brake cone 9 can be directly threaded onto the piston rod 2. Since the brake cone 9 is a disposable part and needs to be replaced frequently, in order to avoid damage to the external thread of the piston rod 2, the brake cone 9 is preferably connected to the piston rod 2 using the following structure: the titanium alloy lifting cylinder also includes a buffer nut 10 threadedly connected to the end of the piston rod 2. One end of the buffer nut 10 has a crimping portion 1001. The outer diameter of the brake cone 9 gradually decreases from the end close to the cylinder body 1 to the end away from the cylinder body 1. The smaller diameter end of the brake cone 9 is pressed between the crimping portion 1001 and the piston rod 2. During installation, the brake cone 9 is first put on the piston rod 2, and then the buffer nut 10 is threadedly locked with the piston rod 2, thereby fixing the brake cone 9, the buffer nut 10 and the piston rod 2. The buffer nut 10 is also made of titanium alloy. The brake cone 9 adopts a conical structure in order to reduce the thickness inside the crimping portion 1001, thereby reducing the diameter of the buffer nut 10, while the other end of the brake cone 9 is thicker so that it can be against the end face of the cylinder body 1, while ensuring the strength of the brake cone 9 so that it will not break at the moment of impact.

[0032] To enhance the connection strength between the brake cone 9 and the piston rod 2, a sealing groove 11 is preferably provided on the outer circumference of the piston rod 2 within the crimping portion 1001. This sealing groove 11 is filled with a sealing ring, which seals the radial gap between the brake cone 9 and the piston rod 2. The sealing ring has a certain degree of elasticity, which provides a pre-tightening effect and also prevents dust or impurities from entering the threaded connection between the buffer nut 10 and the piston rod 2, which could reduce the locking effect.

[0033] In the description of the present invention, it should be understood that the terms "center", "thickness", "inside", "outside", "axial" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0034] In this specification, the schematic representations of the terms do not necessarily refer to the same embodiment. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments.

[0035] Based on the above-mentioned ideal embodiment of the present invention, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the technical scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, but must be determined according to the scope of the claims.

Claims

1. A titanium alloy pulling cylinder, characterized by: The invention comprises a cylinder body (1), a piston rod (2) and a gas generator (12) located in the cylinder body (1); a cavity is provided inside the cylinder body (1); the gas generator (12) divides the cavity into a rod cavity (3) and a rodless cavity (4); one end of the piston rod (2) extends into the rod cavity (3) and is connected to the gas generator (12); one end of the cylinder body (1) where the rodless cavity (4) is located has an air outlet (5); the piston rod (2) is a hollow tube; the portion of the piston rod (2) extending into the cylinder body (1) has an air vent (6); the air vent (6) connects the outlet of the gas generator (12) with the rod cavity (3) through the piston rod (2); The cylinder body (1) and the piston rod (2) are both made of titanium alloy material, and the wall thickness is 3mm to 3.5mm.

2. The titanium alloy pulling cylinder according to claim 1, characterized in that: A brake cone (9) is fixed to the outer peripheral surface of one end of the piston rod (2) away from the cylinder body (1). The brake cone (9) is made of stainless steel. When the piston rod (2) is retracted into the cylinder body (1), the brake cone (9) can abut against the outer end surface of the cylinder body (1).

3. The titanium alloy pulling cylinder according to claim 2, characterized in that: The titanium alloy lifting cylinder further comprises a buffer nut (10) threadedly connected to the end of the piston rod (2), one end of the buffer nut (10) having a crimping portion (1001), the outer diameter of the brake cone (9) gradually decreasing from the end close to the cylinder body (1) to the end away from the cylinder body (1), and the end with a smaller diameter of the brake cone (9) is pressed tightly between the crimping portion (1001) and the piston rod (2).

4. The titanium alloy pulling cylinder according to claim 1, characterized in that: The cylinder body (1) comprises an axially penetrating cylinder barrel (101) and a cylinder cover (102) and a cylinder bottom (103) sealed at both ends of the cylinder barrel (101); the air outlet (5) is located on the cylinder bottom (103); and the piston rod (2) passes through the cylinder cover (102) and extends into the cylinder barrel (101).

5. The titanium alloy pulling cylinder according to claim 1, characterized in that: A buffer spring (7) is sleeved on the piston rod (2) located inside the cylinder body (1).

6. The titanium alloy pulling cylinder according to claim 3, characterized in that: A sealing groove (11) is provided on the outer peripheral surface of the piston rod (2) inside the crimping portion (1001), and a sealing ring is filled in the sealing groove (11). The sealing ring seals the radial gap between the brake cone (9) and the piston rod (2).

7. The titanium alloy pulling cylinder according to claim 3, characterized in that: The buffer nut (10) is made of titanium alloy.

8. The titanium alloy pulling cylinder according to claim 1, characterized in that: The outer peripheral surface of the cylinder body (1) is interference-fitted with a fixing ring (8), which has a laterally extending lug. The fixing ring (8) is made of titanium alloy, and the thickness of the annular portion of the fixing ring (8) is 3 mm to 4 mm.

9. The titanium alloy pulling cylinder according to claim 8, characterized in that: One side of the fixing ring (8) is provided with a horizontal mounting plate (801), and both ends of the horizontal mounting plate (801) form supporting ears, and the two supporting ears are respectively provided with mounting holes (802).

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