Collapsible oil cylinder

Abstract

The utility model provides a collapsible oil cylinder which comprises a cylinder sleeve, an upper end cover, a lower end cover, a first piston, a piston rod and a fixing assembly, and the upper end cover and the lower end cover are respectively connected with the cylinder sleeve. The first piston is slidably connected with the cylinder sleeve, a groove is formed in the first piston, the piston rod is connected with the first piston through a fixing assembly, and the fixing assembly is located in the groove; the fixing assembly comprises an inner nut, a pressing piece and a plurality of pressing bolts, and the inner nut is in threaded connection with one end of the piston rod; the inner nut is sleeved with the pressing piece, and the pressing piece abuts against the outer wall of the inner nut. A plurality of compression bolts penetrate through the compression piece and are connected with the first piston; the piston rod penetrates through the upper end cover. According to the collapsible oil cylinder, the pressing piece is connected with the first piston through the multiple pressing bolts, the pressing piece can wedge the inner nut tightly, the first piston and the piston rod are connected stably, and the running reliability of the collapsible oil cylinder is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydraulic cylinder technical field especially relates to a expansion and contraction cylinder. BACKGROUND

[0002] The open reel machine and the winding machine are the indispensable equipment in the coiled material processing process, and the high-end and the automation degree are continuously improved, and the performance and the precision requirement of the oil cylinder are also higher and higher. Expansion and contraction cylinder adopts solenoid valve control, high precision, can realize subtle force control, ensure that the tension of coiled material is uniform and stable, improve the winding quality, the adjustability and the intelligent degree of expansion and contraction cylinder are higher, can realize multi-segment program control and frequency conversion speed regulation with the help of external control system, satisfy the processing demand of different coiled materials.

[0003] At present, when expansion and contraction cylinder is applied on mechanical equipment (for example: winding machine or open reel machine etc.), because the piston and the piston rod in the expansion and contraction cylinder are connected through single fastener (for example: nut), when the expansion and contraction cylinder reciprocating operation is frequent pressure, the fastener will be shaken off in the oil cylinder cavity, so that the expansion and contraction cylinder is invalid, even the cylinder body is damaged and leads to scrap. SUMMARY

[0004] The utility model aims at solving one of the above technical problems at least to some extent.

[0005] Therefore, one purpose of the utility model lies in providing an expansion and contraction cylinder, which connects the compression piece and the first piston through multiple compression bolts, and the compression piece can wedge the inner nut, so that the connection between the first piston and the piston rod is stable, and the reliability of the expansion and contraction cylinder operation is ensured.

[0006] To achieve the above purpose, the utility model provides an expansion and contraction cylinder in the first aspect, which comprises a cylinder sleeve, an upper end cover, a lower end cover, a first piston, a piston rod and a fixing assembly, wherein the upper end cover and the lower end cover are connected with the cylinder sleeve respectively; the first piston is connected with the cylinder sleeve in sliding mode, a groove is formed in the first piston, the piston rod is connected with the first piston through the fixing assembly, and the fixing assembly is located in the groove; the fixing assembly comprises an inner nut, a compression piece and multiple compression bolts, wherein the inner nut is threadedly connected with one end of the piston rod; the compression piece is sleeved outside the inner nut, and the compression piece abuts against the outer wall of the inner nut; multiple compression bolts penetrate through the compression piece, and the multiple compression bolts are connected with the first piston; the piston rod penetrates through the upper end cover, and the piston rod is connected with the upper end cover in sliding mode.

[0007] In addition, the expansion and contraction cylinder provided in the utility model can have the following additional technical features.

[0008] Specifically, the inner nut is arranged in a tapered structure, the inner nut is provided with an opening, the pressing piece is provided with a circular hole, and the circular hole is arranged in a tapered structure.

[0009] Specifically, a plurality of grooves are arranged on the outer wall of the first piston.

[0010] Specifically, rubber sealing rings are arranged between the upper end cover, the lower end cover and the cylinder sleeve.

[0011] Compared with the prior art, the technical scheme has the following beneficial effects: the telescopic oil cylinder is connected by the pressing piece and the first piston through the plurality of pressing bolts, the pressing piece can wedge the inner nut, the connection between the first piston and the piston rod is stable, and the reliability of the telescopic oil cylinder in operation is ensured.

[0012] The additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0013] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0014] Figure 1 It is an internal sectional view structure schematic diagram of the telescopic oil cylinder according to one embodiment of the present application;

[0015] Figure 2 It is a fixed assembly structure schematic diagram of the telescopic oil cylinder according to one embodiment of the present application;

[0016] Figure 3 It is a sectional view structure schematic diagram of the pressing piece of the telescopic oil cylinder according to one embodiment of the present application;

[0017] Figure 4 It is a three-dimensional structure schematic diagram of the telescopic oil cylinder according to one embodiment of the present application.

[0018] The drawings show that: 1, cylinder sleeve; 2, upper end cover; 3, lower end cover; 4, first piston; 5, piston rod; 6, fixed assembly; 60, groove; 61, inner nut; 611, opening; 62, pressing piece; 63, pressing bolt; 621, circular hole; 71, groove; 72, rubber sealing ring. DETAILED DESCRIPTION

[0019] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0020] The expansion and contraction cylinder of this utility model is described below with reference to the accompanying drawings.

[0021] like Figures 1-4 As shown, the expansion and contraction cylinder of this utility model embodiment may include: cylinder liner 1, upper end cover 2, lower end cover 3, first piston 4, piston rod 5, and fixing assembly 6.

[0022] The upper end cover 2 and the lower end cover 3 are respectively connected to the cylinder liner 1.

[0023] It should be noted that, in this embodiment, the upper end cover 2 and the lower end cover 3 are respectively fixedly connected to the cylinder liner 1 by multiple bolts.

[0024] The first piston 4 is slidably connected to the cylinder liner 1. A groove 60 is provided on the first piston 4. The piston rod 5 is connected to the first piston 4 through a fixing component 6. The fixing component 6 is located inside the groove 60.

[0025] The fixing assembly 6 includes an inner nut 61, a clamping member 62, and a plurality of clamping bolts 63. The inner nut 61 is threaded to one end of the piston rod 5. The clamping member 62 is sleeved on the outside of the inner nut 61 and abuts against the outer wall of the inner nut 61. The plurality of clamping bolts 63 pass through the clamping member 62 and are connected to the first piston 4.

[0026] It should be noted that the clamping bolt 63 described in this embodiment can be an internal hex bolt.

[0027] The piston rod 5 passes through the upper end cover 2, and the piston rod 5 is slidably connected to the upper end cover 2.

[0028] Specifically, when this expansion and contraction cylinder is applied to mechanical equipment (e.g., an uncoiler), the piston rod 5 reciprocates under frequent pressure, and the piston rod 5 applies force to the inner nut 61. The clamping member 62 weds the inner nut 61 tightly, and multiple clamping bolts 63 fix the clamping member 62 to the first piston 4, so that the connection between the first piston 4 and the piston rod 5 is stable, thereby ensuring the reliability of the expansion and contraction cylinder operation.

[0029] Compared with the direct connection between the piston and the piston rod by a single fastener in the prior art, the technical scheme can indirectly connect the inner nut 61 by the pressing member 62, and then disperse the force by the plurality of pressing bolts 63, so that the stability of the connection between the first piston 4 and the piston rod 5 is greatly improved.

[0030] In an embodiment of the utility model, as shown in Figure 2 and Figure 3 The inner nut 61 is in a conical structure, and the inner nut 61 is provided with an opening 611, and the pressing member 62 is provided with a circular hole 621, and the circular hole 621 is in a conical structure.

[0031] It should be noted that the inner nut 61 and the circular hole 621 are connected in cooperation in the embodiment, so that the inner nut 61 and the circular hole 621 can be wedged.

[0032] It should be noted that the opening 611 is arranged on the inner nut 61, so that the diameter of the inner nut 61 can change during the wedging process, so that the inner nut 61 is forced to tightly embrace the outer side of the piston rod 5.

[0033] In an embodiment of the utility model, as shown in Figure 1 A plurality of groove bodies 71 are arranged on the outer wall of the first piston 4.

[0034] It should be noted that the upper end cover 2 and the piston rod 5 are also provided with a plurality of groove bodies 71 in the embodiment.

[0035] It should be noted that the groove body 71 can play the role of oil scraping, and the oil scraping ring arranged in the groove body 71 can also play the role of sealing.

[0036] In an embodiment of the utility model, as shown in Figure 1 The upper end cover 2 and the lower end cover 3 are respectively provided with rubber sealing rings 72 between the upper end cover 2, the lower end cover 3 and the cylinder sleeve 1.

[0037] It should be noted that the rubber sealing rings 72 are arranged between the upper end cover 2, the lower end cover 3 and the cylinder sleeve 1, so that the sealing property between the upper end cover 2, the lower end cover 3 and the cylinder sleeve 1 can be ensured, and the phenomenon of oil leakage of the telescopic oil cylinder during operation can be avoided.

[0038] In summary, the telescopic oil cylinder can connect the pressing member and the first piston by the plurality of pressing bolts, the pressing member can wedge the inner nut, the connection between the first piston and the piston rod is stable, and the reliability of the operation of the telescopic oil cylinder is ensured.

[0039] In the description of the present application, the terms "first", "second" are only used for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0040] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0041] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can change, modify, replace and deform the above embodiments within the scope of the present application.

Claims

1. A hydraulic cylinder for expansion and contraction, characterized in that, include: The cylinder liner (1), upper end cover (2), lower end cover (3), first piston (4), piston rod (5), and fixing assembly (6), wherein, The upper end cap (2) and the lower end cap (3) are respectively connected to the cylinder liner (1); The first piston (4) is slidably connected to the cylinder liner (1), and a groove (60) is provided on the first piston (4). The piston rod (5) is connected to the first piston (4) through the fixing component (6), and the fixing component (6) is located inside the groove (60). The fixing assembly (6) includes an inner nut (61), a clamping member (62), and multiple clamping bolts (63), wherein, The inner nut (61) is threaded to one end of the piston rod (5); The clamping member (62) is sleeved on the outside of the inner nut (61), and the clamping member (62) abuts against the outer wall of the inner nut (61); Multiple clamping bolts (63) penetrate the clamping member (62), and the multiple clamping bolts (63) are connected to the first piston (4); The piston rod (5) passes through the upper end cover (2), and the piston rod (5) is slidably connected to the upper end cover (2).

2. The expansion and contraction cylinder according to claim 1, characterized in that, The inner nut (61) is tapered and has an opening (611). The clamping member (62) has a round hole (621) and the round hole (621) is tapered.

3. The expansion and contraction cylinder according to claim 1, characterized in that, The outer wall of the first piston (4) is provided with multiple grooves (71).

4. The expansion and contraction cylinder according to claim 1, characterized in that, Rubber sealing rings (72) are respectively provided between the upper end cover (2) and the lower end cover (3) and the cylinder liner (1).

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