Double-piston air cylinder of novel structure

Abstract

The double-piston air cylinder of the novel structure comprises a front end cover, a rear end cover, a cylinder barrel, pistons and a piston rod, an air inlet and outlet hole is formed in one side of the front end cover, two inner holes longitudinally penetrating through the cylinder barrel are formed in the front end cover, each inner hole comprises a guide sleeve bottom hole and a vent hole which are communicated, and the inner diameter of the guide sleeve bottom hole is in interference fit with the outer diameter of a guide sleeve; the dustproof sealing ring and the guide sleeve are arranged in the guide sleeve bottom hole, the guide sleeve is arranged above, and the dustproof sealing ring is arranged below; the air inlet and outlet hole is communicated with the vent hole; a positioning table is arranged at the bottom of the front end cover, a sealing groove is formed in the outer side of the positioning table and matched with the O-shaped ring, and the piston rod is matched with the piston through riveting. According to the utility model, the end cover is mainly processed, and the cylinder barrel only needs to be subjected to blanking, surface alignment, chamfering and burr and flash removal, so that the processing difficulty is reduced; according to the structure, the fit clearance is small, the clearance is two threads, the fit clearance is reduced, and the positioning precision is improved; the degree of dependence on mechanical equipment is reduced; and the cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of double-piston cylinders, in particular to a double-piston cylinder with a novel structure. Background Art

[0002] In recent years, with the development of pneumatic automation technology, the requirements for pneumatic actuator cylinders have become increasingly stringent, particularly for dual-piston cylinders, which are increasingly widely used. However, existing dual-piston cylinders still present several issues. For example, existing dual-piston cylinders use retaining rings to connect the front and rear end caps to the cylinder barrel. This design creates a non-integrated dual-piston cylinder end cap. Instead, the front end cap incorporates a dust seal and a guide sleeve, with the dust seal positioned above and the guide sleeve positioned below. Separate grooves for the dust seal are located within the front end cap, while O-ring grooves are located on the exterior of both the front and rear caps to seal the cylinder barrel and piston rod. This structure requires an end cap positioning platform, retaining ring grooves, and air inlet holes within the cylinder barrel. The end caps, when assembled with the cylinder barrel, are completely positioned within the barrel. In existing dual-piston cylinders, the piston and piston rod are connected by a nut. This means that threads are located at the end of the piston rod, which passes through the center of the piston and engages with the nut to secure the piston. These structural features result in a large clearance, ranging from 5 to 10 threads, resulting in poor side load resistance during use, requiring repeated positioning and low positioning accuracy. However, if the gap is too large, the reciprocating motion process will be unstable; the existing double-piston cylinder has high requirements on machine tool precision, is too dependent on it, and has high production costs.

[0003] Therefore, it is urgent to develop a high-efficiency, high-performance dual-piston cylinder, which is also a hot topic in current research. Utility Model Content

[0004] To address the above-mentioned technical problems, the present invention provides a novel dual-piston cylinder structure, comprising a front end cover, a rear end cover, a cylinder barrel, a piston, and a piston rod. One side of the front end cover is provided with an air inlet and outlet hole. Two inner holes extending longitudinally through the cylinder barrel are provided within the front end cover, and the inner holes include a guide sleeve bottom hole and a vent hole. The inner diameter of the guide sleeve bottom hole and the outer diameter of the guide sleeve form an interference fit. The air inlet and outlet holes are connected to the vent hole. A dustproof seal ring and a guide sleeve are positioned within the guide sleeve bottom hole, with the guide sleeve positioned above and the dustproof seal ring positioned below. A positioning platform is provided at the bottom of the front end cover, and a sealing groove is provided on the outside of the positioning platform, which mates with an O-ring.

[0005] Preferably, the four corners of the front end cover are provided with bolt holes, the four corners of the top of the cylinder are provided with threaded holes, and the front end cover and the cylinder are threadedly connected by bolts.

[0006] Preferably, one side of the rear end cover is provided with air inlet and outlet holes, which are connected to the interior of the cylinder; the top of the rear end cover is provided with a positioning platform, the outer side of the positioning platform is provided with a sealing groove, and the sealing groove cooperates with the O-ring.

[0007] Preferably, bolt holes are provided at the four corners of the rear end cover, and threaded holes are provided at the four corners of the bottom of the cylinder barrel, and bolts pass through the bolt holes and are threadedly connected to the cylinder barrel.

[0008] Preferably, the bolt is a hexagon socket bolt.

[0009] The front and rear end covers of the utility model are connected to the cylinder barrel by hexagon socket bolts.

[0010] Preferably, an axial through hole is provided in the center of the piston, a preset chamfer is provided on the outside of the through hole, and a prefabricated material is provided at the end of the piston rod. The prefabricated material passes through the piston through hole and the prefabricated chamfer to realize the connection between the piston rod and the piston by riveting.

[0011] Preferably, a dustproof sealing ring is provided below the guide sleeve.

[0012] The front cover of this utility model has two internal holes, one for the guide sleeve bottom hole and the other for the air vent. The inner diameter of the guide sleeve bottom hole is an interference fit with the outer diameter of the guide sleeve. A dustproof seal is installed under the guide sleeve. The positioning platforms of the front and rear covers are provided with sealing grooves, the size of which matches the O-ring. When assembled with the cylinder and piston rod, they provide a double seal. When assembled with the cylinder, only the positioning platform remains inside the cylinder. The front and rear covers are designed with air inlet and outlet holes, eliminating the need to machine air inlet and outlet holes on the cylinder.

[0013] Preferably, the front end cover and the rear end cover are both made of ADC12 aluminum alloy.

[0014] Compared with the prior art, the present invention has beneficial effects. Specifically:

[0015] 1. Reduced processing difficulty: The existing double-piston cylinder requires complex processing of the end cover and the cylinder barrel at the same time. The utility model only requires processing the end cover, and the cylinder barrel only needs to be cut, aligned, chamfered, and deburred.

[0016] 2. Improved concentricity assurance: The fit gap is small, with a gap of 2 threads, which reduces the fit gap and improves positioning accuracy. It also overcomes the shortcomings of the existing technology: the fit gap is large, between 5-10 threads, and customers need to repeat positioning during use, and the positioning accuracy is low. The large gap causes the reciprocating motion process to run unsteadily.

[0017] 3. Reduced dependence on mechanical equipment: The processing and manufacturing of the front and rear end covers and cylinder barrels of the existing double-piston cylinders require very precise mechanical equipment to ensure their processing accuracy and concentricity; the end covers of the utility model can be mass-produced by die-casting, and ordinary lathes can be used for fine processing, which reduces the need for high-precision equipment to ensure accuracy and concentricity.

[0018] 4. Cost Savings: This new dual-piston cylinder changes the connection method and structure of the front and rear end covers and the cylinder barrel. The material of the front and rear end covers has been changed from 6061 aluminum to ADC12 aluminum alloy, and the cylinder barrel is shorter than that of existing dual-piston cylinders, saving raw material costs. Existing dual-piston cylinder manufacturing requires more demanding staffing, while this new model reduces the difficulty of manufacturing and thus reduces staffing requirements, thus saving labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The technical solution of the utility model will be further described below with reference to the accompanying drawings:

[0020] Figure 1 It is a sectional view of the front end cover of the utility model.

[0021] Figure 2 It is a sectional view of the rear end cover of the utility model.

[0022] Figure 3 It is a top view of the front end cover of the utility model.

[0023] Figure 4 It is a top view of the rear end cover of the utility model.

[0024] Figure 5 It is a three-dimensional diagram of a double-piston cylinder with a novel structure and a front end cover on top.

[0025] Figure 6 It is a structural schematic diagram of the piston of the utility model.

[0026] Figure 7 It is a structural schematic diagram of the piston rod of the utility model.

[0027] In the figure: 1. Bottom hole of guide sleeve, 2. Inlet and outlet holes, 3. Sealing groove, 4. Bolt hole, 5. Bolt, 6. Prefabricated chamfer, 7. Prefabricated material, 8. Front cover, 9. Rear cover, 10. Cylinder, 11. Vent hole. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions of the present invention in conjunction with specific implementation schemes. However, those skilled in the art should understand that the implementation schemes described below are only used to illustrate the present invention and should not be considered as limiting the scope of the present invention. Based on the implementation schemes in the present invention, all other implementation schemes obtained by those of ordinary skill in the art without making any creative efforts shall fall within the scope of protection of the present invention.

[0029] like Figure 1-7As shown, the utility model discloses a double-piston cylinder with a novel structure, including a front end cover 8, a rear end cover 9, a cylinder barrel 10, a piston and a piston rod. An air inlet and outlet hole 2 is provided on one side of the front end cover 8, and two inner holes are provided inside the front end cover 8 that pass through the cylinder barrel 10 longitudinally. The inner hole includes a connected guide sleeve bottom hole 1 and a vent hole 11. The longitudinal direction here refers to the axial direction of the cylinder. The guide sleeve bottom hole 1 is interference fit with the outer diameter of the guide sleeve; the air inlet and outlet hole 2 is connected to the vent hole 11; a positioning platform is provided at the bottom of the front end cover 8, and a sealing groove 3 is provided on the outside of the positioning platform, and the sealing groove 3 cooperates with the O-ring.

[0030] The four corners of the front end cover 8 are provided with bolt holes 4 , the four corners of the top of the cylinder 10 are provided with threaded holes, and the front end cover 8 and the cylinder 10 are threadedly connected by bolts 5 .

[0031] One side of the rear end cover 9 is provided with an air inlet and outlet hole 2, which is connected to the inside of the cylinder 10; the top of the rear end cover 9 is provided with a positioning platform, and the outer side of the positioning platform is provided with a sealing groove 3, which cooperates with the O-ring.

[0032] The four corners of the rear end cover 9 are provided with bolt holes 4 , and the four corners of the bottom of the cylinder 10 are provided with threaded holes, and the bolts 5 pass through the bolt holes 4 and are threadedly connected to the cylinder 10 .

[0033] The bolt 5 is a hexagon socket bolt hole.

[0034] An axial through hole is provided in the center of the piston, and a prefabricated chamfer 6 is provided on the outside of the through hole. A prefabricated material 7 is provided at the end of the piston rod. After riveting, the prefabricated material 7 is pressed into the prefabricated chamfer 6, thereby realizing the connection between the piston and the piston rod.

[0035] A dustproof sealing ring is provided below the guide sleeve, and the below refers to the bottom end of the guide sleeve.

[0036] like Figure 1 、 2 As shown, a new type of double-piston cylinder includes front and rear end covers. The front end cover 8 is provided with a cylinder inlet and outlet hole 2 on the outside, and the size is consistent with the general cylinder in the industry; the front end cover 8 is provided with two inner holes, namely the guide sleeve bottom hole 1 and the vent hole 11. The inner diameter of the guide sleeve bottom hole is interference fit with the outer diameter of the guide sleeve. A dustproof sealing ring is installed under the guide sleeve. Sealing grooves 3 are provided at the positioning platforms of the front and rear end covers. The sealing grooves 3 cooperate with the O-rings and play a double sealing role after being assembled with the cylinder barrel 10.

[0037] The front end cover 8 of the present invention is provided with a cylinder inlet and outlet hole 2 on the outside, and two inner holes are provided inside the front end cover 8, namely the guide sleeve bottom hole 1 and the vent hole 11. The front and rear end cover positioning platforms are provided with sealing grooves 3. The processing structure is mainly concentrated on the front and rear end covers, and the processing difficulty is transferred to the end covers. In this way, only the end covers need to be processed, and the cylinder barrel only needs to be cut, flushed, chamfered, and burred and flashed, which reduces the processing difficulty. At the same time, instead of ensuring the concentricity of the two axes by ensuring the concentricity of the end covers and the cylinder barrel at the same time in the industry, the concentricity of the two axes is ensured by the end covers, which improves the concentricity accuracy of the two axes, improves the processing efficiency, and improves the ability to ensure concentricity.

[0038] The front end cover 8 and the rear end cover 9 are produced as blanks by die casting.

[0039] The utility model does not need to use high-precision equipment to ensure accuracy and concentricity. The end covers can be mass-produced by die-casting, and ordinary lathes can be used for fine processing, which reduces the dependence on mechanical equipment.

[0040] The front and rear end covers are provided with hexagon socket bolt holes 4, such as Figure 3 、 4 As shown. Figure 5 As shown, the front and rear end covers of the new double-piston cylinder are assembled with the cylinder barrel 10 by means of threaded connection via bolts 5; threaded holes are provided on the four sides of the cylinder barrel 10, Figure 3 、 4 The hexagon socket bolt holes 4 in the front and rear end covers are connected by hexagon socket bolts 5.

[0041] The front cover 8 and the rear cover 9 are both made of ADC12 aluminum alloy.

[0042] The double-piston cylinder of the utility model changes the connection form between the front and rear end covers and the cylinder barrel, as well as the structure of the front and rear end covers; the material of the front and rear end covers is changed from 6061 aluminum to ADC12 aluminum alloy, and the length of the cylinder barrel is shorter than that of the existing double-piston cylinder, thereby saving costs on raw materials; the utility model reduces the difficulty of processing, thereby reducing the requirements for personnel allocation, and saving costs on labor.

[0043] like Figure 6 、 Figure 7 As shown, the piston of the double-piston cylinder of the new structure is provided with a prefabricated chamfer 6, and the piston rod is provided with a prefabricated material 7. After riveting, the prefabricated material 7 is pressed into the prefabricated chamfer 6 of the piston, thereby realizing the connection between the piston and the piston rod, which is not easy to fall off after connection.

[0044] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A new type of double-piston cylinder, comprising a front end cover (8), a rear end cover (9), a cylinder barrel (10), a piston and a piston rod, characterized in that: One side of the front end cover (8) is provided with an air inlet and outlet hole (2), and the interior of the front end cover (8) is provided with two inner holes that penetrate longitudinally along the cylinder (10), and the inner holes include a guide sleeve bottom hole (1) and a vent hole (11) that are connected, and the guide sleeve bottom hole (1) is interference-fitted with the outer diameter of the guide sleeve; the air inlet and outlet hole (2) is connected with the vent hole (11); the front end cover (8) is provided with a positioning platform, and a sealing groove (3) is provided on the outer side of the positioning platform, and the sealing groove (3) is matched with an O-ring.

2. The double-piston cylinder of the novel structure according to claim 1 is characterized in that: The four corners of the front end cover (8) are provided with bolt holes (4), the four corners of the top of the cylinder barrel (10) are provided with threaded holes, and the front end cover (8) and the cylinder barrel (10) are connected by bolts (5).

3. The double-piston cylinder of the novel structure according to claim 1 or 2 is characterized in that: One side of the rear end cover (9) is provided with an air inlet and outlet hole (2), which is communicated with the interior of the cylinder (10); the rear end cover (9) is provided with a positioning platform that cooperates with the cylinder, and a sealing groove (3) is provided on the outer side of the positioning platform, which cooperates with the O-ring.

4. The double-piston cylinder of the novel structure according to claim 3 is characterized in that: The four corners of the rear end cover (9) are provided with bolt holes (4), and the four corners of the bottom of the cylinder (10) are provided with threaded holes, and the bolts (5) pass through the bolt holes (4) and are threadedly connected to the cylinder (10).

5. The double-piston cylinder of the novel structure according to claim 2 or 4 is characterized in that: The bolt (5) is a hexagon socket bolt.

6. The novel double-piston cylinder according to claim 1 is characterized in that: An axial through hole is provided at the center of the piston, a prefabricated chamfer (6) is provided on the outer side of the through hole, a prefabricated material (7) is provided at the end of the piston rod, and the prefabricated material (7) passes through the piston through hole and the prefabricated chamfer (6) to realize the connection between the piston rod and the piston by riveting.

7. The novel double-piston cylinder according to claim 1 is characterized in that: A dustproof sealing ring is provided below the guide sleeve.

8. The novel double-piston cylinder according to claim 1 is characterized in that: The front end cover (8) and the rear end cover (9) are both made of ADC12 aluminum alloy.

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