Tension balance cylinder

Abstract

The utility model discloses a tension balance cylinder, which comprises a cylinder barrel, a piston and a spring, one end of the piston rod extends into the cylinder barrel and is connected with the piston; the supporting sleeves are arranged in pairs, a plurality of sets of pull rods extending in the length direction of the cylinder barrel are arranged on the periphery of the cylinder barrel, and the supporting sleeves are connected to the two ends of the cylinder barrel through the pull rods. According to the balance cylinder, the problems that in the prior art, cylinder covers are connected to the two sides of a cylinder body in a welded mode, when the balance cylinder breaks down and needs to be overhauled, maintained and replaced, good dismounting efficiency cannot be achieved, and operation convenience is reduced are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of nitrogen spring system parts and components, and in particular relates to a tension balancing cylinder. Background Art

[0002] Nitrogen spring is a new type of elastic component with high-pressure nitrogen as the working medium. It is small in size, large in elasticity, long in stroke, stable in operation, precisely manufactured, long in service life (one million times), with a gentle elasticity curve, and no need for pre-tightening, etc. It can perform tasks that are difficult to accomplish with conventional elastic components such as metal springs, rubber and air cushions, simplify mold design and manufacturing, facilitate mold installation and adjustment, extend mold service life, ensure stable product quality, and can also be used in home appliance molds, medicine, aerospace and other fields.

[0003] For large-load industrial robots, the second joint bears the largest load, especially when the arm is stretched wide, the second joint motor needs to bear most of the robot's own weight and the weight of the external load. For compact design and power consumption considerations, the power of the robot's second joint motor cannot be too large, but the second joint motor alone cannot provide sufficient torque output, so an additional balancing system is needed to provide auxiliary torque for the second joint axis, which is where the industrial robot balancing cylinder is used. Since the balancing cylinder is mounted on the robot and used as a mechanical arm tension spring, the equipment works more stably and is more energy-efficient.

[0004] A Chinese patent with application number CN202122146513.1 discloses a tension-type nitrogen spring, comprising an outer cylinder body, the upper end of the outer cylinder body is open, the lower end is closed, a guide cylinder cover is arranged at the upper end of the outer cylinder body, a hollow guide cylinder sleeve is arranged inside the outer cylinder body, a cylinder sleeve seal is arranged between the bottom of the guide cylinder sleeve and the outer cylinder body, a piston pull rod is passed through the guide cylinder sleeve, a rod seal 1 and a rod seal 2 are arranged between the upper end of the piston pull rod and the guide cylinder cover and the outer cylinder body, and the rod seal 1 and the rod seal 2 are both installed on the inner wall of the guide cylinder cover and the outer cylinder body.

[0005] As the applicant conducted further research, it was found that since the cylinder head in this technical solution is connected to both sides of the cylinder body by welding, when the balance cylinder fails and needs to be repaired, maintained or replaced, good disassembly efficiency cannot be achieved, thereby reducing the convenience of operation. Utility Model Content

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A tension balancing cylinder, comprising:

[0008] A cylinder having a piston disposed therein;

[0009] A piston rod, one end of which extends into the cylinder and is connected to the piston;

[0010] Support sleeves are arranged in pairs, and the outer periphery of the cylinder is provided with a plurality of groups of tie rods extending along the length direction of the cylinder, and the support sleeves are connected to the two ends of the cylinder through the tie rods;

[0011] The pull rod is detachably connected to the support sleeve via the fastener.

[0012] Furthermore, the other end of the piston rod is connected to a first earring, and the support sleeve away from the first earring is connected to a second earring.

[0013] Furthermore, bearings are installed in the first earring and the second earring.

[0014] Furthermore, at least one of the first earring and the second earring is provided with an oil filling hole.

[0015] Furthermore, a pressure gauge and a pressure regulating valve are provided on the support sleeve close to the first earring.

[0016] Furthermore, a guide support ring and a dust ring are provided between the support sleeve and the piston rod, sealing grooves are provided at both ends of the guide support ring, and the dust ring is installed at the sealing grooves.

[0017] Furthermore, the piston rod is provided with a pressure relief groove along the length direction, and when the piston rod is stretched relative to the cylinder beyond a set stroke, the pressure relief groove is communicated with the sealing groove.

[0018] Furthermore, a pressure relief valve is also provided on the support sleeve.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] Compared with the welded cylinder barrel, the balancing pressure cylinder is fixedly connected to the front and rear support sleeves by multiple tie rods, which makes the balancing cylinder easier to assemble, convenient for the staff to operate and use, and makes the cylinder body easy to inspect and maintain. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of a tension balancing cylinder of the utility model (viewing angle 1);

[0022] Figure 2 This is a three-dimensional structural schematic diagram of an embodiment of a tension balancing cylinder of the utility model (viewing angle 2);

[0023] Figure 3 It is a schematic diagram of the exploded structure of a tension balance cylinder embodiment of the utility model (viewing angle 1);

[0024] Figure 4This is a schematic diagram of the exploded structure of an embodiment of a tension balance cylinder of the utility model (viewpoint 2);

[0025] Figure 5 It is a cross-sectional structural schematic diagram of an embodiment of the utility model;

[0026] The reference numerals in the drawings of the specification include:

[0027] Cylinder 1, piston 2, piston rod 3, pressure relief groove 30, support sleeve 4, guide support ring 40, sealing groove 41, dust ring 42, pull rod 5, fastener 6, first earring 70, second earring 71, bearing 72, oil filling hole 73, pressure gauge 80, pressure regulating valve 81. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0029] Among them, the drawings are only used for exemplary explanations, and they only show schematic diagrams rather than actual drawings, and cannot be understood as limitations on this patent; in order to better illustrate the embodiments of the utility model, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted, and the same or similar reference numerals in the drawings of the embodiments of the utility model correspond to the same or similar parts; in the description of the utility model, it should be understood that if the terms "upper", "lower", "left", "right", "inner", "outer" and the like appear, the directions or positional relationships indicated are based on the directions or positional relationships shown in the drawings, which are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, so the terms describing the positional relationship in the drawings are only used for exemplary explanations, and cannot be understood as limitations on this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0030] like Figure 1 - Figure 5 As shown, a tension balance cylinder of the utility model comprises a cylinder barrel 1, a support sleeve 4, a piston 2 rod and a fastener 6;

[0031] Among them, a piston 2 is arranged in the cylinder 1, one end of the piston 2 rod extends into the cylinder 1 and is connected to the piston 2, and a storage area for nitrogen filling is formed between the cylinder 1 and the piston 2 rod. Nitrogen is a colorless and odorless gas under normal conditions, and generally nitrogen has a lower density than air. Nitrogen is chemically inactive and is difficult to react with other substances at room temperature, and is not easy to corrode the cylinder 1. High-purity nitrogen has a low thermal expansion coefficient because it is oxygen-free, moisture-free, and oil-free, and will not cause sudden changes in air pressure due to heat generated when the pneumatic balance cylinder moves.

[0032] The pneumatic balance cylinder is driven directly by pure nitrogen. Since pure nitrogen is stable (gas pressure and volume are not easy to change), it provides stable pressure to the pneumatic balance cylinder, making its stroke precise.

[0033] The support sleeves 4 are arranged in pairs, and a plurality of groups of tie rods 5 extending along the length direction of the cylinder 1 are arranged on the outer periphery of the cylinder 1, and the support sleeves 4 are connected to the two ends of the cylinder 1 through the tie rods 5;

[0034] The contact surface between the piston 2 rod and the piston 2 is provided with a sealing installation groove and a retaining spring limiting groove close to the bottom end surface of the piston 2 rod.

[0035] The pull rod 5 is detachably connected to the support sleeve 4 via a fastener 6 .

[0036] Compared with the welded cylinder barrel 1, the balancing pressure cylinder is fixedly connected to the front and rear support sleeves 4 by a plurality of tie rods 5, so that the balancing cylinder is easier to assemble, convenient for the staff to operate and use, and the cylinder body is easy to inspect and maintain.

[0037] The fastener 6 can be in various structural forms such as bolts, retaining rings, pins, etc. One end of the pull rod 5 penetrates the support sleeve 4 and cooperates with the matching fastener 6, so that the cylinder 1 can be fixed between multiple formed cage shapes. The type of the fastener 6 is not specifically limited.

[0038] In addition, a first earring 70 is connected to the other end of the piston rod 2 , and a second earring 71 is connected to the support sleeve 4 away from the first earring 70 .

[0039] The first earring 70 and the second earring 71 are provided with bearings 72 .

[0040] In this embodiment, the first earring 70 is an upper earring, and correspondingly, the second earring 71 is arranged at the bottom and is a lower earring. The upper earring adopts a needle roller type load-bearing bearing 72, and the lower earring adopts a self-aligning bearing 72 inside, which can adapt to a wider range of installation conditions and application conditions.

[0041] Among them, at least one of the first earring 70 and the second earring 71 is provided with an oil filling hole 73. Through the setting of the oil filling hole 73, grease, such as butter, can be conveniently added to the first earring 70 or the second earring 71 to lubricate and maintain the bearing 72.

[0042] A pressure gauge 80 and a pressure regulating valve 81 are provided on the support sleeve 4 near the first earring 70. The balancing cylinder has its own pressure gauge 80 to monitor the internal pressure in real time, and the pressure regulating valve 81 is used to adjust the internal pressure of the balancing cylinder. The internal pressure can be adjusted according to the actual situation for different robots and different loads.

[0043] A guide support ring 40 and a dust ring 42 are provided between the support sleeve 4 and the piston 2 rod. Sealing grooves 41 are provided at both ends of the guide support ring 40, and the dust ring 42 is installed at the sealing grooves 41. The dust ring 42 is internally dustproof and adopts an AF type metal frame structure, a metal frame plus a polyurethane reverse lip seal structure, which effectively prevents foreign matter such as oil, iron filings, etc. from entering the cylinder 1.

[0044] In addition, a pressure relief groove 30 is provided along the length of the piston 2 rod to play a role in safety protection. When the piston 2 rod is stretched relative to the cylinder 1 beyond the set stroke, the pressure relief groove 30 is connected to the sealing groove 41. When the device is used beyond the stroke, the pressure relief groove 30 reaches the main sealing position, causing the seal to fail, thereby achieving the purpose of pressure relief.

[0045] A pressure relief valve is also provided on the support sleeve 4. A fixed thread and a pressure relief valve (not shown) are provided on the balancing cylinder. When the pressure is too high or the overtravel is used, the pressure relief valve works to release the internal pressure of the cylinder body, thus playing a safety protection role.

[0046] The above are only embodiments of the utility model. The common sense such as the known specific structures and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field are aware of all the common technical knowledge in the technical field to which the utility model belongs before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement the scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for the ordinary technicians in the relevant field to implement this application. It should be pointed out that for the technicians in this field, without departing from the structure of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent.

Claims

1. A tension balancing cylinder, characterized in that: include: A cylinder having a piston disposed therein; A piston rod, one end of which extends into the cylinder and is connected to the piston; Support sleeves are arranged in pairs, and the outer periphery of the cylinder is provided with a plurality of groups of tie rods extending along the length direction of the cylinder, and the support sleeves are connected to the two ends of the cylinder through the tie rods; A fastener, through which the pull rod is detachably connected to the support sleeve; A guide support ring and a dust ring are arranged between the support sleeve and the piston rod, and sealing grooves are opened at both ends of the guide support ring, and the dust ring is installed at the sealing groove; The piston rod is provided with a pressure relief groove along the length direction. When the piston rod is stretched relative to the cylinder beyond a set stroke, the pressure relief groove is communicated with the sealing groove.

2. A tension balancing cylinder as claimed in claim 1, characterized in that: The other end of the piston rod is connected to a first earring, and the support sleeve away from the first earring is connected to a second earring.

3. A tension balancing cylinder as claimed in claim 2, characterized in that: Bearings are installed in the first earring and the second earring.

4. A tension balancing cylinder as claimed in claim 2 or 3, characterized in that: At least one of the first earring and the second earring is provided with an oil filling hole.

5. A tension balancing cylinder as claimed in claim 4, characterized in that: A pressure gauge and a pressure regulating valve are arranged on the support sleeve close to the first earring.

6. A tension balancing cylinder as claimed in claim 1, 2, 3 or 5, characterized in that: The support sleeve is also provided with a pressure relief valve.

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