Low-noise two-stage air cylinder

Abstract

The low-noise two-stage air cylinder comprises an outer cylinder body, an inner cylinder body, a piston rod and a sealing piece, and further comprises a first lining arranged between the outer end of the inner cylinder body and the piston rod in a sleeving mode. The limiting groove is formed in the inner side wall of the first lining of the inner cylinder body / the peripheral wall of the piston rod; the limiting edge is arranged on the peripheral wall of the piston rod of the inner cylinder body / the inner side wall of the lining I; the fixing ring is fixedly connected to the end part of the outer cylinder body and is provided with a roller groove penetrating in the radial direction; the flat and straight surface is arranged on the side wall of the inner cylinder body; in daily use, by adopting the technical scheme and arranging the multiple sets of limiting grooves and limiting edges, the piston rod can only do telescopic motion along the axis, the idler wheels abut against the flat face, and the inner cylinder body can only do telescopic motion in the axial direction.

Description

Technical Field

[0001] The utility model relates to a low-noise two-stage cylinder. Background Art

[0002] The cylinder is composed of a cylinder barrel, an end cover, a piston, a piston rod and a seal. For example, the Chinese utility model patent with publication number CN216343139U discloses a double-stage double-acting cylinder for a dump truck, which includes the above structure, but has the following defects:

[0003] 1. There is no limit structure on the inner cylinder body and the piston rod. When it is necessary to push the external parts to move horizontally, it is often necessary to equip an external limit device to ensure that the inner rod body and the piston rod do not rotate, such as the combination of the slide groove and the slide rail, which increases the cost of use;

[0004] 2. When the piston rod retracts, the components installed on the outer end of the piston rod will collide with the end of the inner cylinder body and produce noise. Summary of the invention

[0005] The utility model aims to solve one of the technical problems existing in the prior art.

[0006] The present application provides a low-noise two-stage cylinder, comprising an outer cylinder body, an inner cylinder body, a piston rod and a seal, and also comprising:

[0007] Limiting member 1, which is used to make the piston rod slide only along the axis;

[0008] The second limiting member is used to allow the inner cylinder body to slide only in the axial direction.

[0009] The limiting component 1 includes:

[0010] Bushing 1, which is sleeved between the outer end of the inner cylinder body and the piston rod;

[0011] A limiting groove is provided on the inner side wall of the bushing 1 of the inner cylinder body / the peripheral wall of the piston rod;

[0012] The limiting edge is arranged on the inner side wall of the peripheral wall / sleeve of the piston rod of the inner cylinder body.

[0013] The number of the limiting grooves and the limiting edges is greater than one.

[0014] The second limiting component includes:

[0015] A fixing ring, which is fixed to the end of the outer cylinder body and has a roller groove running radially therethrough;

[0016] A flat surface, which is arranged on the side wall of the inner cylinder body;

[0017] The roller is rotatably installed in the roller groove through a rotating shaft, and the peripheral wall is tightly pressed against the flat surface.

[0018] The second limiting member also includes:

[0019] The second bushing is fixed on the inner peripheral wall of the fixing ring.

[0020] The second limiting member also includes:

[0021] The floating through groove is arranged on the fixed ring and is perpendicular to the roller groove;

[0022] A pair of tightening devices, used to apply pressure to both ends of the rotating shaft;

[0023] Wherein, two ends of the rotating shaft are rotatably installed in two ends of the floating through slot.

[0024] The tightening device comprises:

[0025] A screw hole, which is arranged on the outer peripheral wall of the fixing ring, and the inner end of which is connected with one end of the floating through groove;

[0026] The fastening bolt is matched with the screw hole through threads, and the inner end thereof is tightly pressed against the peripheral wall of the rotating shaft.

[0027] The tightening device also includes:

[0028] Lock nut, which is installed on the fastening bolt through thread.

[0029] The second limiting member has a pair, which is symmetrically arranged on both sides of the end of the outer cylinder body.

[0030] Also includes:

[0031] A shock-absorbing washer is fixedly arranged at the end of the outer cylinder body.

[0032] The beneficial effects of the utility model are as follows:

[0033] 1. Through the setting of the bushing, the limit groove and the limit edge, it is ensured that the piston rod can only move along the axis; through the setting of the fixing ring, the flat surface, the roller groove, the roller and the rotating shaft, the inner cylinder body can only move along the axis, saving the external limit mechanism and reducing the use cost of the two-stage cylinder;

[0034] 2. Through the arrangement of the bushing, floating groove, screw hole, fastening bolt and locking nut, the friction noise between the outer peripheral wall of the inner cylinder body and the fixing ring and roller is reduced, and the limiting effect of the inner cylinder body is ensured;

[0035] 3. By setting the shock-absorbing washer, when the piston rod retracts, the parts installed on its outer end will not collide with the inner cylinder body, which reduces noise and protects the outer end of the inner cylinder body. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A top view of a low-noise two-stage cylinder in an embodiment of the present application;

[0037] Figure 2 for Figure 1 Schematic diagram of the cross-section structure in the AA direction;

[0038] Figure 3 for Figure 2 Schematic diagram of the cross-section structure in the middle BB direction;

[0039] Figure 4 for Figure 2 Schematic diagram of the cross-section structure in the CC direction.

[0040] Reference numerals

[0041] 1-outer cylinder body, 2-inner cylinder body, 3-piston rod, 4-seal, 5-limiting piece 1, 51-bushing 1, 52-limiting groove, 53-limiting edge, 6-limiting piece 2, 61-fixing ring, 62-roller groove, 63-flat surface, 64-roller, 65-rotating shaft, 66-bushing 2, 67-floating through groove, 7-tightening device, 71-screw hole, 72-fastening bolt, 73-locking nut, 8-shock-absorbing washer. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0043] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0044] The low-noise two-stage cylinder provided in the embodiment of the present application is described in detail below through specific embodiments and application scenarios in conjunction with the accompanying drawings.

[0045] Embodiment 1:

[0046] like Figures 1 to 4As shown, an embodiment of the present application provides a low-noise two-stage cylinder, including an outer cylinder body 1, an inner cylinder body 2, a piston rod 3 and a seal 4, and also includes a limit member 5, which is used to allow the piston rod 3 to slide only along the axis; a limit member 6, which is used to allow the inner cylinder body 2 to slide only along the axial direction.

[0047] Furthermore, the limiting member 5 includes a bushing 51, which is sleeved between the outer end of the inner cylinder body 2 and the piston rod 3; a limiting groove 52, which is arranged on the inner side wall of the bushing 51 of the inner cylinder body 2 / the peripheral wall of the piston rod 3; and a limiting edge 53, which is arranged on the peripheral wall of the piston rod 3 of the inner cylinder body 2 / the inner side wall of the bushing 51.

[0048] Preferably, the number of the limiting grooves 52 and the number of the limiting edges 53 are both greater than one.

[0049] Furthermore, the second limiting member 6 includes a fixing ring 61, which is fixedly connected to the end of the outer cylinder body 1 and has a roller groove 62 extending radially therethrough; a flat surface 63, which is arranged on the side wall of the inner cylinder body 2; and a roller 64, which is rotatably installed in the roller groove 62 via a rotating shaft 65, and the peripheral wall is tightly pressed against the flat surface 63.

[0050] Preferably, there is a pair of limiting members 6 symmetrically arranged on both sides of the end of the outer cylinder body 1 .

[0051] Furthermore, it also includes a shock-absorbing washer 8 which is fixed at the end of the outer cylinder body 1 .

[0052] In this embodiment of the present application, due to the adoption of the above-mentioned structure, when the piston rod 3 and the inner cylinder body 2 perform telescopic movements, each limiting edge 53 slides in the corresponding limiting groove 52, and each roller 64 rolls on the corresponding flat surface 63, so that the piston rod 3 and the inner cylinder body 2 cannot rotate around their own circumference. When the piston rod 3 and the inner cylinder retract, the component installed on the outer end of the piston rod 3 collides with the shock-absorbing washer 8. The shock-absorbing washer 8 is made of rubber and can effectively absorb impact, reduce noise and effectively buffer, thereby protecting the outer end of the inner cylinder.

[0053] Embodiment 2:

[0054] like Figure 4 As shown, in this embodiment, in addition to the structural features of the aforementioned embodiments, the second limiting member 6 also includes a second bushing 66 , which is fixed on the inner circumferential wall of the fixing ring 61 .

[0055] Furthermore, the second limiting member 6 also includes a floating groove 67, which is arranged on the fixing ring 61 and is perpendicular to the roller groove 62; a pair of tightening devices 7 are used to apply pressure to both ends of the rotating shaft 65, and the two ends of the rotating shaft 65 can be rotatably installed in the two ends of the floating groove 67.

[0056] Furthermore, the clamping device 7 includes a screw hole 71, which is arranged on the outer peripheral wall of the fixing ring 61, and the inner end is connected to one end of the floating through groove 67; a fastening bolt 72, which is threadably matched with the screw hole 71, and the inner end is clamped against the peripheral wall of the rotating shaft 65.

[0057] Furthermore, the clamping device 7 also includes a locking nut 73 which is threadably mounted on the fastening bolt 72 .

[0058] In this embodiment of the present application, due to the adoption of the above-mentioned structure, the friction between the outer wall and flat surface 63 of the inner cylinder and the inner circumferential wall of the fixing ring 61 and the outer wall of the roller 64 is reduced through the provision of the second bushing 66, thereby reducing noise and reducing component loss. The wear resistance coefficient of the second bushing 66 is lower than that of the outer circumferential wall of the inner cylinder, so that the wear rate of the outer wall and flat surface 63 of the inner cylinder slidingly rubbed against the inner wall of the second bushing 66 is lower than that of the second bushing 66. When the second bushing 66 is worn out, the fastening bolt 72 is tightened so that the roller 64 can still provide sufficient pressure on the second bushing 66, so that the inner wall of the corresponding position of the second bushing 66 is pressed tightly against the flat surface 63, thereby ensuring the limiting effect on the inner cylinder. After adjusting the position of the fastening bolt 72, the locking nut 73 is tightened to prevent the fastening bolt 72 from loosening.

[0059] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0060] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A low-noise two-stage cylinder, comprising an outer cylinder body (1), an inner cylinder body (2), a piston rod (3) and a sealing member (4), characterized in that: Also includes: A limiting member (5) for enabling the piston rod (3) to slide only along the axis; A second limiting member (6) is used to allow the inner cylinder body (2) to slide only in the axial direction.

2. A low-noise two-stage cylinder according to claim 1, characterized in that: The first limiting member (5) comprises: A bushing (51) is sleeved between the outer end of the inner cylinder (2) and the piston rod (3); A limiting groove (52) is arranged on the inner side wall of the bushing 1 (51) of the inner cylinder body (2) / on the peripheral wall of the piston rod (3); A limiting edge (53) is arranged on the inner side wall of the peripheral wall / sleeve (51) of the piston rod (3) of the inner cylinder body (2).

3. A low noise two-stage cylinder according to claim 2, characterized in that: The number of the limiting grooves (52) and the limiting edges (53) are both greater than one.

4. A low-noise two-stage cylinder according to claim 1, characterized in that: The second limiting member (6) comprises: A fixing ring (61) fixedly connected to the end of the outer cylinder (1) and having a roller groove (62) extending radially therethrough; A flat surface (63) disposed on a side wall of the inner cylinder (2); The roller (64) is rotatably mounted in the roller groove (62) via a rotating shaft (65), and the peripheral wall is tightly pressed against the flat surface (63).

5. A low-noise two-stage cylinder according to claim 4, characterized in that: The second limiting member (6) further comprises: A second bushing (66) is fixed on the inner peripheral wall of the fixing ring (61).

6. A low noise two-stage cylinder according to claim 4, characterized in that: The second limiting member (6) further comprises: A floating through groove (67) is arranged on the fixing ring (61) and is perpendicular to the roller groove (62); A pair of tightening devices (7) for applying pressure to both ends of the rotating shaft (65); Wherein, the two ends of the rotating shaft (65) are rotatably mounted in the two ends of the floating through groove (67).

7. A low noise two-stage cylinder according to claim 6, characterized in that: The abutting device (7) comprises: A screw hole (71) is provided on the outer peripheral wall of the fixing ring (61), and the inner end of the screw hole is connected to one end of the floating through groove (67); The fastening bolt (72) is threadably matched with the screw hole (71), and the inner end thereof is tightly pressed against the peripheral wall of the rotating shaft (65).

8. A low noise two-stage cylinder according to claim 7, characterized in that: The abutting device (7) further comprises: A locking nut (73) is installed on the fastening bolt (72) through threads.

9. A low noise two-stage cylinder according to claim 1 or 4, characterized in that: The second limiting member (6) comprises a pair, which are symmetrically arranged on both sides of the end of the outer cylinder body (1).

10. A low-noise two-stage cylinder according to any one of claims 1 to 8, characterized in that: Also includes: A shock-absorbing washer (8) is fixedly arranged at the end of the outer cylinder body (1).

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