Crank connecting rod mechanism

Abstract

The utility model discloses a crank connecting rod mechanism in the technical field of filter stick cutting forming, which comprises a crank, and a mounting cavity is formed at one end of the crank; the end face of the crank disc is fixedly connected with an eccentric shaft, and the eccentric shaft is mounted in the mounting cavity through a bearing; the oil seal assembly is arranged on the outer side of the eccentric shaft in a sleeving manner and is mounted in the mounting cavity; the oil seal assembly comprises an annular sealing elastic base body, an annular sealing lip and an annular hooping spring, an annular containing cavity is formed in the annular sealing elastic base body, and the annular sealing lip is integrally formed on the inner circumferential face of the annular sealing elastic base body and is close to the open end of the annular containing cavity. The annular hooping spring is coaxially contained in the annular containing cavity and enables the annular sealing lip to elastically abut against the outer circumferential face of the eccentric shaft. According to the oil seal assembly, centripetal force is provided for the annular sealing lip through the annular hooping spring, the sealing performance between the annular sealing lip and the surface of the eccentric shaft is improved, the service life of the oil seal assembly is prolonged, and the maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of filter rod cutting and forming, in particular to a crank-connecting rod mechanism. Background Art

[0002] Seals are widely used in the mechanical industry, chemical industry, coal, petroleum, transportation, etc., and have become basic components and accessories in various industries. The sealing effect of equipment will directly affect the performance and normal operation of the whole machine. At the same time, the sealing performance of the equipment is also an important indicator for evaluating the quality of the whole machine product.

[0003] The oil seal structure is a common mechanical sealing component. Under the high-frequency vibration of mechanical equipment and the variable pressure of the fluid medium, the main lip part of the oil seal structure and the surface of the mating shaft can form and maintain a close contact state, maintaining a stable sealing effect.

[0004] As the main model for the production of hard Zhonghua 67# filter rods, the crank-connecting rod mechanism of the KDF4 filter rod forming machine has experienced a significant increase in failure frequency compared to the past, with the specification of hard Zhonghua being modified and the speed of forming equipment being increased. The crank-connecting rod mechanism is the main component of the filter rod cutting process of the forming machine, and its function is to drive the bell mouth (the bell mouth provides support for the blade cutting) to make reciprocating motion. When the operating speed of the equipment is increased, the component frequently leaks oil and increases in temperature due to the increased usage rate, shortening the service life of the equipment and increasing maintenance costs. Utility Model Content

[0005] In view of this, the purpose of the present invention is to provide a crank-connecting rod mechanism to solve the above technical problems.

[0006] The technical solution adopted by the utility model is: a crank-connecting rod mechanism, comprising:

[0007] A crank, one end of which is formed with a mounting cavity;

[0008] A crank plate, an eccentric shaft is fixedly connected to the end surface of the crank plate, and the eccentric shaft is installed in the installation cavity through a bearing;

[0009] An oil seal assembly, wherein the oil seal assembly is sleeved on the outside of the eccentric shaft and installed in the installation cavity;

[0010] The oil seal assembly comprises an annular sealing elastic base, an annular sealing lip and an annular clamping spring. An annular receiving cavity with an open end is formed on the end surface of the annular sealing elastic base. The annular sealing lip is integrally formed on the inner circumferential surface of the annular sealing elastic base and is close to one end of the opening of the annular receiving cavity. The annular clamping spring is accommodated in the annular receiving cavity, and the annular clamping spring is coaxially sleeved on the inner circumferential surface of the annular receiving cavity and makes the annular sealing lip elastically abut against the outer circumferential surface of the eccentric shaft.

[0011] Preferably, the radial dimension of the annular tightening spring in a natural state is smaller than the inner diameter of the annular accommodation cavity.

[0012] Preferably, the circumferential length of the annular tightening spring in a natural state is 78 mm, and the elastic stiffness coefficient of the annular tightening spring is 1.213 N / mm.

[0013] Preferably, the annular tightening spring is an annular helical spring wound with stainless steel wire.

[0014] Preferably, the diameter of the stainless steel wire is 0.2 mm.

[0015] Preferably, the lip angle of the annular sealing lip is 40°.

[0016] Preferably, the annular sealing elastic matrix and the annular sealing lip are made of fluororubber.

[0017] Preferably, a limiting ring for axially limiting the annular clamping spring is formed on the inner circumferential surface of the annular accommodating cavity.

[0018] Beneficial effects of the utility model:

[0019] The utility model forms an annular accommodating cavity with an open end on the end surface of an annular sealing elastic substrate, an annular sealing lip is integrally formed on the inner circumferential surface of the annular sealing elastic substrate close to the end of the opening of the annular accommodating cavity, and an annular clamping spring is sleeved on the inner circumferential surface of the annular accommodating cavity, radial pressure can be applied to the annular sealing lip through elastic deformation of the annular clamping spring, so that an adhesive oil film of appropriate thickness exists between the annular sealing lip and the outer circumferential surface of the eccentric shaft, which can not only play the role of sealing the fluid medium, but also play the role of lubricating the annular sealing lip and the eccentric shaft, thereby avoiding dry friction between the oil seal component and the eccentric shaft and causing wear of the oil seal component and the eccentric shaft and a sharp increase in heat generation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the crank-connecting rod mechanism of the utility model;

[0021] Figure 2 It is a top view of the oil seal assembly of the utility model;

[0022] Figure 3 for Figure 2 AA view in.

[0023] Description of reference numerals in the figures:

[0024] 100, crank; 110, mounting cavity;

[0025] 200, crank plate; 210, eccentric shaft;

[0026] 300, bearings;

[0027] 400, oil seal assembly; 410, annular sealing elastic matrix; 420, annular sealing lip; 430, annular clamping spring; 440, annular accommodating cavity; 450, limiting ring. DETAILED DESCRIPTION

[0028] The following is a further detailed description of the specific implementations of the present invention in conjunction with the accompanying drawings. These implementations are only used to illustrate the present invention, but not to limit the present invention.

[0029] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In addition, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0032] Examples, such as Figure 1 , Figure 2 and Figure 3 As shown, a crank-connecting rod mechanism comprises:

[0033] The crank 100 has a mounting cavity 110 formed at the rotating end of the crank 100 .

[0034] The crank disk 200 has an eccentric shaft 210 fixedly connected to the end face of one end of the crank disk 200. The axis of the eccentric shaft 210 is arranged parallel to the axis of the crank disk 200, and the eccentric shaft 210 is installed in the installation cavity 110 through a bearing 300, that is, one end of the eccentric shaft 210 extends axially into the installation cavity 110, and the eccentric shaft 210 is rotatably connected to the crank 100 through the bearing 300.

[0035] The oil seal assembly 400 is sleeved on the outside of the eccentric shaft 210 and installed in the installation cavity 110 to prevent the lubricating oil in the installation cavity 110 from flowing out.

[0036] Among them, the oil seal assembly 400 includes an annular sealing elastic base 410, an annular sealing lip 420 and an annular clamping spring 430. An annular receiving cavity 440 with an open end is formed on the end surface of the annular sealing elastic base 410. The annular sealing lip 420 is integrally formed on the inner circumferential surface of the annular sealing elastic base 410, and the annular sealing lip 420 is located at one end close to the opening of the annular receiving cavity 440. The annular clamping spring 430 is accommodated in the annular receiving cavity 440, and the annular clamping spring 430 is coaxially sleeved on the inner circumferential surface of the annular receiving cavity 440 and makes the annular sealing lip 420 elastically abut against the outer circumferential surface of the eccentric shaft 210, so as to apply radial pressure to the annular sealing lip 420 through the annular clamping spring 430, thereby improving the sealing effect of the oil seal assembly 400.

[0037] In the present application, an annular receiving cavity 440 with an opening at one end is formed on the end face of the annular sealing elastic base 410, and an annular sealing lip 420 is integrally formed on the inner circumferential surface of the annular sealing elastic base 410 near the end of the opening of the annular receiving cavity 440, and an annular clamping spring 430 is sleeved on the inner circumferential surface of the annular receiving cavity 440. Radial pressure can be applied to the annular sealing lip 420 through the elastic deformation of the annular clamping spring 430, so that an adhesive oil film of appropriate thickness exists between the annular sealing lip 420 and the outer circumferential surface of the eccentric shaft 210, which can not only seal the fluid medium, but also lubricate the annular sealing lip 420 and the eccentric shaft 210, thereby avoiding dry friction between the oil seal assembly 400 and the eccentric shaft 210 and causing wear of the oil seal assembly 400 and the eccentric shaft 210 and a sharp increase in heat generation.

[0038] In a specific embodiment, if Figure 3 As shown, the lip angle α of the annular sealing lip 420 is 40°.

[0039] Specifically, the lip angle α is the angle between the annular sealing lip 420 and the eccentric shaft 210. In order to obtain the appropriate angle of the lip angle α, the oil seal assembly 400 cut at two angles was tested for operating life while maintaining the same shaft diameter. The results are shown in Table 3.

[0040] Table 3 Test results of two different lip angles

[0041]

[0042] Through comparative measurement, the lip angle α of the annular sealing lip 420 is set to 40°, which has a longer service life.

[0043] Preferably, the annular sealing elastic base 410 and the annular sealing lip 420 are made of fluororubber. Fluororubber still has good physical properties under high temperature (up to 250° C.) conditions, and usually has very good resistance to oil, fuel, solvents and chemicals.

[0044] In a specific embodiment, if Figure 2 As shown, the radial dimension of the annular tightening spring 430 in the natural state is smaller than the inner diameter dimension of the annular receiving cavity 440, that is, the minimum radial dimension of the inner circumferential surface of the annular receiving cavity 440 is larger than the radial dimension of the annular tightening spring 430 in the natural state, so that after the annular tightening spring 430 is sleeved on the inner circumferential surface of the annular receiving cavity 440, the annular tightening spring 430 undergoes elastic deformation and applies centripetal force to the annular sealing lip 420.

[0045] Preferably, the circumferential length of the annular tightening spring 430 is 78 mm, and the elastic stiffness coefficient of the annular tightening spring 430 is 1.213 N / mm.

[0046] Specifically, the clamping force of the annular clamping spring 430 is related to the length of the annular clamping spring 430. By testing several annular clamping springs 430 with different lengths, it is found that the most suitable length of the annular clamping spring 430 is 78 mm, as shown in Table 1.

[0047] Table 1 Summary of test spring parameters

[0048]

[0049] Preferably, the annular tightening spring 430 is an annular helical spring wound with stainless steel wire.

[0050] The diameter of the stainless steel wire is d=0.2 mm; and the helical angle of the annular helical spring is 5.14°.

[0051] The material standards and specifications of stainless steel wire are as follows, see Table 2.

[0052] Table 2 Basic parameters of stainless steel wire

[0053]

[0054] In a specific embodiment, if Figure 3 As shown, a limiting ring 450 for axially limiting the annular clamping spring 430 is formed on the inner circumferential surface of the annular receiving cavity 440, that is, the limiting ring 450 is integrally formed on the inner circumferential surface of the annular receiving cavity 440 near the end of the opening of the annular receiving cavity 440; the outer diameter of the limiting ring 450 is larger than the inner diameter of the annular clamping spring 430 after being sleeved in the annular receiving cavity 440, and is used to axially limit the annular clamping spring 430 to prevent the annular clamping spring 430 from escaping from the annular receiving cavity 440, thereby improving the stability of the oil seal assembly 400.

[0055] Compared with the prior art, this application has at least the following beneficial technical effects:

[0056] 1) The annular clamp spring provides centripetal force for the annular sealing lip, thereby improving the sealing performance between the annular sealing lip and the surface of the eccentric shaft.

[0057] 2) The annular sealing elastic base and the annular sealing lip are made of fluororubber, which has higher tolerance temperature and speed under high speed operation.

[0058] 3) The lip angle of the annular sealing lip is 40°, which can effectively increase the service life of the oil seal assembly while improving the sealing effect and durability of the oil seal cover.

[0059] 4) The annular clamp spring is an annular spiral spring formed by winding stainless steel wire, which has sufficient elastic strength and hardness and can withstand high temperatures.

[0060] The replacement period of the crank rocker mechanism in the present application is increased from half a year to more than two years. Even if damage occurs, only the oil seal assembly needs to be replaced, which greatly saves maintenance costs.

[0061] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A crank-connecting rod mechanism, characterized in that: include: A crank (100), wherein one end of the crank (100) is formed with a mounting cavity (110); A crank plate (200), an eccentric shaft (210) being fixedly connected to the end surface of the crank plate (200), and the eccentric shaft (210) being installed in the installation cavity (110) via a bearing (300); An oil seal assembly (400), wherein the oil seal assembly (400) is sleeved on the outside of the eccentric shaft (210) and installed in the installation cavity (110); The oil seal assembly (400) comprises an annular sealing elastic base (410), an annular sealing lip (420) and an annular clamping spring (430); an annular accommodating cavity (440) with an open end is formed on the end surface of the annular sealing elastic base (410); the annular sealing lip (420) is integrally formed on the inner circumferential surface of the annular sealing elastic base (410) and is close to one end of the opening of the annular accommodating cavity (440); the annular clamping spring (430) is accommodated in the annular accommodating cavity (440); and the annular clamping spring (430) is coaxially sleeved on the inner circumferential surface of the annular accommodating cavity (440) and enables the annular sealing lip (420) to elastically abut against the outer circumferential surface of the eccentric shaft (210).

2. A crank-connecting rod mechanism according to claim 1, characterized in that: The radial dimension of the annular tightening spring (430) in a natural state is smaller than the inner diameter dimension of the annular accommodation cavity (440).

3. A crank-connecting rod mechanism according to claim 2, characterized in that: The circumferential length of the annular tightening spring (430) in a natural state is 78 mm, and the elastic stiffness coefficient of the annular tightening spring (430) is 1.213 N / mm.

4. A crank-connecting rod mechanism according to claim 3, characterized in that: The annular tightening spring (430) is an annular helical spring wound with stainless steel wire.

5. A crank-connecting rod mechanism according to claim 4, characterized in that: The diameter of the stainless steel wire is 0.2 mm.

6. The crank-connecting rod mechanism according to claim 1, characterized in that: The lip angle of the annular sealing lip (420) is 40°.

7. The crank-connecting rod mechanism according to claim 1, characterized in that: The annular sealing elastic base (410) and the annular sealing lip (420) are made of fluororubber.

8. The crank-connecting rod mechanism according to claim 1, characterized in that: A limiting ring (450) for axially limiting the annular clamping spring (430) is formed on the inner circumferential surface of the annular accommodation cavity (440).

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