Magnetic coupling type rodless cylinder

Abstract

The utility model discloses a magnetic coupling type rodless air cylinder, which relates to the technical field of rodless air cylinders and comprises a cylinder barrel, a sliding block sleeved on the cylinder barrel and cylinder barrel end covers arranged at two ends of the cylinder barrel. A piston assembly is arranged in the cylinder barrel in a sliding mode and comprises a piston shaft, a plurality of inner magnets, a plurality of first partition plates, two inner end covers, two clamping nuts, two compression springs and two annular plates. The utility model has the advantages that: by reducing the number of the outer magnets, the adsorption capacity of the outer magnets to dust containing metal around is reduced, so that the number of dust deposited on the cylinder barrel is reduced, and the resistance and abrasion of the sliding block in the moving process on the cylinder barrel are reduced; and meanwhile, a compression spring and an annular plate are installed on the piston shaft, so that the piston assembly can avoid the problem that when the air pressure is suddenly increased, the piston assembly collides with the cylinder barrel end cover, and then the inner magnet is broken, and the protection effect on the inner magnet is improved.

Description

Technical Field:

[0001] The utility model relates to the technical field of rodless cylinders, and specifically relates to a magnetic coupling rodless cylinder. Background Art:

[0002] A rodless cylinder refers to a cylinder that uses a piston to directly or indirectly connect to an external actuator and enables it to reciprocate following the piston. The greatest advantage of this cylinder is saving installation space and being maintenance-free after installation. Rodless cylinders include mechanical rodless cylinders and magnetic coupling rodless cylinders. Among them, the movement of the magnetic coupling type is achieved by driving an outer ring magnet outside the piston rod with an inner ring magnet inside the cylinder barrel.

[0003] The existing problems are as follows:

[0004] First, when the existing magnetic coupling rodless cylinder is used in a dusty environment, since the outer magnets inside the slider are usually set to four, the magnetic force inside the slider is relatively large, which easily adsorbs the dust containing metal around it. After long-term use, there is a lot of dust between the cylinder barrel surface and the slider, resulting in problems such as resistance and wear during the movement of the slider on the cylinder barrel.

[0005] Second, since the inner ring magnet inside the cylinder barrel slides in the rod by air pressure drive, if an accident occurs to the air pressure, causing the air pressure to suddenly increase, it is very likely that the inner magnet will hit the cylinder end covers at both ends of the cylinder barrel, resulting in the fracture of the inner magnet, and there is a lack of protective measures for the inner magnet. Content of the Utility Model:

[0006] The purpose of the utility model is to provide a magnetic coupling rodless cylinder to solve the problems raised in the above background art.

[0007] The utility model is implemented by the following technical solutions:

[0008] A magnetic coupling rodless cylinder includes a cylinder barrel, a slider sleeved on the cylinder barrel, and cylinder end covers arranged at both ends of the cylinder barrel; a piston assembly is slidably arranged inside the cylinder barrel. The piston assembly includes a piston shaft, a plurality of inner magnets, a plurality of first partition plates, two inner end covers, two clamping nuts, two compression springs, and two ring plates; the plurality of inner magnets and first partition plates are cross-distributed and sleeved on the middle surface of the piston shaft. The two inner end covers are symmetrically sleeved on both ends of the piston shaft. A hole groove coaxial with the piston shaft is opened inside the inner end cover. Clamping nuts are threadedly connected to both ends of the piston shaft, and the clamping nuts are placed inside the hole groove to clamp the inner magnets, first partition plates, and inner end covers together. Compression springs are sleeved on both ends of the piston shaft respectively. One end of the compression spring abuts against the end face of the clamping nut and is fixed on the piston shaft. Ring plates are slidably sleeved on both ends of the piston shaft respectively, and the ring plates are fixed to the other ends of the compression springs.

[0009] Preferably, a plurality of outer magnets and second partition plates are cross - distributed inside the middle of the slider, and an outer end - cover, a sealing ring and a dust - scraping ring are sequentially fixed along the outer - side direction of the second partition plate inside the slider.

[0010] Preferably, a wear - resistant ring and a piston O - ring are sleeved on the inner end - cover, and the wear - resistant ring is in sliding fit with the inner wall of the cylinder barrel.

[0011] Preferably, a buffer washer is fixed at one end of the cylinder - barrel end - cover close to the cylinder barrel, and the buffer washer is in movable abutment with the ring plate.

[0012] Advantages of the present utility model: By reducing the number of outer magnets, the dust - adsorption ability of the outer magnets to the surrounding metal - containing dust is reduced, thereby reducing the amount of dust deposited on the cylinder barrel, and reducing the resistance and wear during the movement of the slider on the cylinder barrel; at the same time, a compression spring and a ring plate are installed on the piston shaft, so that when the air pressure suddenly increases, the piston assembly can avoid the problem that the inner magnet breaks after the piston assembly and the cylinder - barrel end - cover collide, improving the protection effect on the inner magnet. Description of the drawings:

[0013] Figure 1 is a schematic structural view of the present utility model;

[0014] Figure 2 is an internal cross - sectional view of the present utility model;

[0015] Figure 3 is Figure 2 the enlarged view of part A in

[0016] In the figure: 1. Cylinder barrel, 2. Slider, 3. Cylinder - barrel end - cover, 4. Piston assembly, 4.1. Piston shaft, 4.2. Inner magnet, 4.3. First partition plate, 4.4. Inner end - cover, 4.41. Hole groove, 4.42. Wear - resistant ring, 4.43. Piston O - ring, 4.5. Clamping nut, 4.6. Compression spring, 4.7. Ring plate, 5. Outer magnet, 6. Second partition plate, 7. Outer end - cover, 8. Sealing ring, 9. Dust - scraping ring, 10. Buffer washer. Specific embodiments:

[0017] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0018] Please refer to Figures 1-3 , the present utility model provides a technical solution of a magnetic - coupling rodless cylinder:

[0019] A magnetic coupling type rodless cylinder, comprising a cylinder barrel 1, a slider 2 sleeved on the cylinder barrel 1, and cylinder end covers 3 arranged at both ends of the cylinder barrel 1; a piston assembly 4 is slidably arranged in the cylinder barrel 1, and the piston assembly 4 includes a piston shaft 4.1, four inner magnets 4.2, three first partition plates 4.3, two inner end covers 4.4, two clamping nuts 4.5, two compression springs 4.6 and two ring plates 4.7; the four inner magnets 4.2 and the three first partition plates 4.3 are cross-distributed and sleeved on the middle surface of the piston shaft 4.1, the two inner end covers 4.4 are symmetrically sleeved on both ends of the piston shaft 4.1, a hole groove 4.41 coaxial with the piston shaft 4.1 is formed in the inner end cover 4.4, clamping nuts 4.5 are threadedly connected to both ends of the piston shaft 4.1, and the clamping nuts 4.5 are placed in the hole groove 4.41 to clamp the inner magnets 4.2, the first partition plates 4.3 and the inner end covers 4.4 together. A wear-resistant ring 4.42 and a piston O-ring 4.43 are sleeved on the inner end cover 4.4, so that the wear-resistant ring 4.42 slides and fits with the inner wall of the cylinder barrel 1 to prevent the inner magnets 4.2 from being worn; the piston O-ring 4.43 reduces the entry of dust into the slider 2. Compression springs 4.6 are sleeved on both ends of the piston shaft 4.1, one end of each compression spring 4.6 abuts against the end face of the clamping nut 4.5 and is fixed on the piston shaft 4.1, ring plates 4.7 are slidably sleeved on both ends of the piston shaft 4.1, the ring plates 4.7 are usually located outside the hole groove 4.41, the ring plates 4.7 are fixed to the other ends of the compression springs 4.6, and a buffer washer 10 is fixed to one end of the cylinder end cover 3 close to the cylinder barrel 1, and the buffer washer 10 is in movable abutment with the ring plate 4.7. When the air pressure suddenly increases, after the ring plate 4.7 abuts against the buffer washer 10, the compression springs 4.6 elastically contract to buffer the piston shaft 4.1 with elastic force, reduce the impact force caused by the increase in air pressure, prevent the piston assembly 4 from colliding with the cylinder end cover 3, thereby avoiding the fracture of the inner magnets, and improving the protection effect on the inner magnets 4.2.

[0020] At the same time, two outer magnets 5 and three second partition plates 6 are cross-distributed in the middle of the slider 2, and an outer end cover 7, a sealing ring 8 and a dust scraping ring 9 are sequentially fixed on the outer side of the slider 2 along the second partition plate 6; on the premise of not affecting the normal operation of the slider 2, the number of the outer magnets 5 is reduced, so as to reduce the adsorption capacity of its own magnetic force on the surrounding metal-containing dust, reduce the amount of dust deposited between the surface of the cylinder barrel 1 and the slider 2, and through the protection of the sealing ring 8 and the dust scraping ring 9, the influence of dust on the slider 2 can be further reduced, the running ability of the slider 2 can be improved, the running resistance of the slider 2 can be reduced, and the working efficiency can be improved.

[0021] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A magnetic coupling rodless cylinder, comprising a cylinder barrel (1), a slider (2) sleeved on the cylinder barrel (1), and cylinder end covers (3) arranged at both ends of the cylinder barrel (1); characterized in that: A piston assembly (4) is slidably arranged in the cylinder barrel (1). The piston assembly (4) includes a piston shaft (4.1), a plurality of inner magnets (4.2), a plurality of first partition plates (4.3), two inner end covers (4.4), two clamping nuts (4.5), two compression springs (4.6) and two ring plates (4.7); the plurality of inner magnets (4.2) and the first partition plates (4.3) are cross-distributed and sleeved on the middle surface of the piston shaft (4.1), the two inner end covers (4.4) are symmetrically sleeved on the two ends of the piston shaft (4.1), a hole groove (4.41) coaxial with the piston shaft (4.1) is formed in the inner end cover (4.4), clamping nuts (4.5) are threadedly connected to the two ends of the piston shaft (4.1), and the clamping nuts (4.5) are placed in the hole groove (4.41) to clamp the inner magnets (4.2), the first partition plates (4.3) and the inner end covers (4.4) together. Compression springs (4.6) are sleeved on the two ends of the piston shaft (4.1) respectively. One end of each compression spring (4.6) abuts against the end face of the clamping nut (4.5) and is fixed on the piston shaft (4.1). Ring plates (4.7) are slidably sleeved on the two ends of the piston shaft (4.1) respectively, and the ring plates (4.7) are fixed to the other ends of the compression springs (4.6).

2. The magnetic coupling type rodless cylinder according to claim 1, characterized in that: A plurality of outer magnets (5) and second partition plates (6) are cross-distributed in the middle of the slider (2). An outer end cover (7), a sealing ring (8) and a dust scraping ring (9) are sequentially fixed in the slider (2) along the outer side direction of the second partition plate (6).

3. The magnetic coupling type rodless cylinder according to claim 1, characterized in that: A wear-resistant ring (4.42) and a piston O-ring (4.43) are sleeved on the inner end cover (4.4), and the wear-resistant ring (4.42) is in sliding fit with the inner wall of the cylinder barrel (1).

4. A magnetic coupling type rodless cylinder according to claim 1, characterized in that: A buffer washer (10) is fixed to one end of the cylinder barrel end cover (3) close to the cylinder barrel (1), and the buffer washer (10) is in movable abutment with the ring plate (4.7).

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