Tool clamp for fatigue strength test of connecting rod

Abstract

The utility model relates to a work fixture for a fatigue strength test of a connecting rod, which comprises a first die sleeve, a second die sleeve and a shaft part which are used for butting and fixing the end part of the connecting rod, a first half groove and a second half groove which are used for forming a circular groove are formed in the butt joint position of the first die sleeve and the second die sleeve respectively, and the shaft part penetrates through a shaft hole in the end of the connecting rod and the circular groove at the same time and is precisely matched with the circular groove. According to the utility model, the clamp is divided into the first die sleeve and the second die sleeve, so that the circular groove is formed by splicing the first half groove and the second half groove, and the shaft part only needs to be butted with the shaft hole in the end part of the connecting rod; the first half groove and the second half groove are gradually closed to form a circular groove through the splicing process of the second die sleeve, the circular groove is precisely matched with the shaft part, and the problem that a heavy connecting rod and all hole grooves are difficult to align is solved.

Description

Technical Field

[0001] The utility model belongs to the field of connecting rod testing, and in particular relates to a fixture used for connecting rod fatigue strength testing. Background Art

[0002] The engine's connecting rod requires a fatigue strength test on the finished product. The specific test method is: fix the two ends of the connecting rod with a clamp, connect the clamp to the test device, and apply short-amplitude, high-frequency pressure to the axial hole at the end of the connecting rod. The function of the clamp is to fix the connecting rod, and then accurately transmit the pressure applied by the test device to the axial hole at the end of the connecting rod through the shaft.

[0003] Existing clamps are generally one-piece, with a circular hole corresponding to the end shaft hole on the clamp, and the shaft passes through the circular hole and the shaft hole. In order to quickly transmit the above-mentioned applied pressure through the shaft, the shaft and the above-mentioned circular hole or shaft hole must be precisely matched. This type of clamp is suitable for light connecting rods. For heavy connecting rods used in ships, the connecting rods and shafts are heavy, and it is difficult to completely align the circular hole and the shaft hole, which increases the difficulty of inserting the shaft. Utility Model Content

[0004] The purpose of the present utility model is to provide a fixture for connecting rod fatigue strength test in order to solve the above problems.

[0005] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0006] A fixture for connecting rod fatigue strength testing includes a first die sleeve, a second die sleeve, and a shaft portion for docking and fixing the end of the connecting rod, wherein the first die sleeve and the second die sleeve are detachably fixed, and the docking point of the first die sleeve and the second die sleeve is respectively provided with a first half groove and a second half groove for forming a circular groove, and the shaft portion simultaneously passes through the axial hole and the circular groove of the end of the connecting rod and is precisely matched.

[0007] As a further optimization scheme of the present invention, a receiving groove for accommodating the end of the connecting rod is provided on one side of the first mold sleeve, and the second mold sleeve has two, which are respectively located on both sides of the receiving groove and fixed to the first mold sleeve by a first fixing bolt. Two second mold sleeves are provided to fix the two ends of the shaft so that the force on the shaft is balanced, and through the cooperation of the first fixing bolt, the shaft can be completely and precisely matched with the circular groove without the need for alignment during the process of closing the first half groove and the second half groove to form a circular groove.

[0008] As a further optimization solution of the present invention, the shaft portion and the shaft hole at the end portion are interference fit to prevent the shaft portion from deviating axially when subjected to force, and through the interference fit, the shaft portion can apply force to the shaft hole better during testing.

[0009] As a further optimization scheme of the present invention, the two ends of the shaft are flush with the outer edges of the circular grooves on both sides, and the outer edges of the circular grooves are also provided with limit members for limiting the axial movement of the shaft. The limit members are used for limiting the position, which is more convenient for disassembly and assembly than interference fit.

[0010] As a further optimization solution of the present invention, the limiting member is annular and fixed to the first mold sleeve and the second mold sleeve through a second fixing bolt. The annular limiting member can press against both ends of the shaft to prevent its axial movement.

[0011] As a further optimization solution of the present invention, one side of the first mold sleeve is connected to the test device through a connecting piece, wherein the connecting piece is fixedly connected to the first mold sleeve through a flange, so as to be conveniently connected to the test device.

[0012] As a further optimization solution of the present invention, the outer surface of the first mold sleeve is further provided with grooves for reducing weight.

[0013] The beneficial effects of the present invention are:

[0014] The utility model divides the clamp into a first die sleeve and a second die sleeve, so that the circular groove is formed by splicing the first half groove and the second half groove. The shaft portion only needs to be docked with the shaft hole at the end of the connecting rod. When the shaft portion is docked with the first die sleeve and the second die sleeve, the first half groove and the second half groove are gradually closed into a circular groove through the splicing process of the second die sleeve, and are precisely matched with the shaft portion, thereby solving the problem that the heavy connecting rod and the various hole grooves are difficult to align. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0016] Figure 2 It is a side sectional view of the present utility model.

[0017] In the figure: 1. first mold sleeve; 11. accommodating groove; 12. first half groove; 13. groove; 2. second mold sleeve; 21. second half groove; 22. first fixing bolt; 3. shaft; 4. limit member; 41. second fixing bolt; 5. connecting member; 51. flange; 6. connecting rod; 61. end. DETAILED DESCRIPTION

[0018] The present application is described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0019] Example 1

[0020] like Figure 1-2 As shown, a fixture for connecting rod fatigue strength test includes a first die sleeve 1, a second die sleeve 2 and a shaft portion 3 for docking and fixing the end portion 61 of the connecting rod 6, wherein the first die sleeve 1 and the second die sleeve 2 are detachably fixed, and the docking portion of the first die sleeve 1 and the second die sleeve 2 is respectively provided with a first half groove 12 and a second half groove 21 for forming a circular groove, and the shaft portion 3 simultaneously passes through the axial hole and the circular groove of the end portion 61 of the connecting rod 6 and is precisely matched.

[0021] In this solution, the fixture is divided into a first die sleeve 1 and a second die sleeve 2, so that the circular groove is formed by splicing the first half groove 12 and the second half groove 21. The shaft portion 3 only needs to be docked with the shaft hole 61 of the end portion of the connecting rod 6. When the shaft portion 3 is docked with the first die sleeve 1 and the second die sleeve 2, the first half groove 12 and the second half groove 21 are gradually closed into a circular groove through the splicing process of the second die sleeve 2, and precisely matched with the shaft portion, thereby solving the problem that the heavy connecting rod and the various hole grooves are difficult to align.

[0022] One side of the first die sleeve 1 is provided with a receiving groove 11 for accommodating the end 61 of the connecting rod 6. The second die sleeve 2 has two, which are respectively located on both sides of the receiving groove 11 and fixed to the first die sleeve 1 through the first fixing bolt 22. Two second die sleeves 2 are provided to fix the two ends of the shaft portion 3 so that the force on the shaft portion 3 is balanced, and through the cooperation of the first fixing bolt 22, the shaft portion 3 can be completely and precisely matched with the circular groove without alignment during the process of closing the first half groove 12 and the second half groove 21 to form a circular groove (that is, during the process of tightening the first fixing bolt 22).

[0023] The two ends of the shaft 3 are flush with the outer edges of the circular grooves on both sides. The outer edges of the circular grooves are also provided with limit members 4 for limiting the axial movement of the shaft 3. The limit members 4 are used to limit the shaft 3 to prevent it from deviating axially when subjected to force.

[0024] Furthermore, the limit member 4 is annular and is fixed to the first mold sleeve 1 and the second mold sleeve 2 by a second fixing bolt 41. The annular limit member 4 can press against the two ends of the shaft 3 to prevent its axial movement, and the shaft 3 can extend a boss to both ends, and the boss is adapted to the inner diameter of the annular limit member 4 to facilitate support of the annular limit member 4 and facilitate installation.

[0025] One side of the first mold sleeve 1 is connected to the test device through a connector 5, wherein the connector 5 is fixedly connected to the first mold sleeve 1 through a flange 51, which is convenient for connection with the test device. The outer surface of the first mold sleeve 1 is also provided with a groove 13 for reducing weight.

[0026] The specific implementation method is as follows: the two ends of the connecting rod 6 are respectively installed with the shaft parts 3 of corresponding apertures, and then the connecting rod 6 is placed in the accommodating groove 11, and the second mold sleeve 2 is fixed to the first mold sleeve 1 through the first fixing bolt 22. During the fixing process, the first half groove 12 and the second half groove 21 are gradually formed, the shaft part 3 is pressed, and then the limiter 4 is fixed to limit the axial movement of the shaft part 3. The large and small ends of the connecting rod 6 are both set with the first mold sleeve 1 and the second mold sleeve 2 of corresponding sizes, and then connected to the test device through the connecting piece 5 to start the test.

[0027] As another embodiment, an interference fit is provided between the shaft portion 3 and the shaft hole of the end portion 61 to replace the limiter 4 to prevent the shaft portion 3 from deviating axially when subjected to force. Moreover, the interference fit can better enable the shaft portion 3 to apply force to the shaft hole during testing.

[0028] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the scope of the present invention, all of which fall within the scope of protection of the present invention.

Claims

1. A fixture for connecting rod fatigue strength test, characterized by: The invention comprises a first die sleeve (1), a second die sleeve (2) and a shaft portion (3) for docking and fixing the end portion (61) of the connecting rod (6), wherein the first die sleeve (1) and the second die sleeve (2) are detachably fixed, and the docking portion of the first die sleeve (1) and the second die sleeve (2) is respectively provided with a first half groove (12) and a second half groove (21) for forming a circular groove, and the shaft portion (3) simultaneously passes through the axial hole of the end portion (61) of the connecting rod (6) and the circular groove and is precisely matched.

2. A fixture for connecting rod fatigue strength test according to claim 1, characterized in that: One side of the first die sleeve (1) is provided with a receiving groove (11) for receiving the end (61) of the connecting rod (6); the second die sleeve (2) has two receiving grooves, which are respectively located on both sides of the receiving groove (11) and fixed to the first die sleeve (1) via first fixing bolts (22).

3. The fixture for connecting rod fatigue strength test according to claim 1, characterized in that: The shaft portion (3) and the shaft hole of the end portion (61) are interference fit.

4. The fixture for connecting rod fatigue strength test according to claim 1, characterized in that: The two ends of the shaft portion (3) are flush with the outer edges of the circular grooves on both sides, and the outer edges of the circular grooves are also provided with limiting members (4) for limiting the axial movement of the shaft portion (3).

5. The fixture for connecting rod fatigue strength test according to claim 4, characterized in that: The position-limiting member (4) is annular and is fixed to the first mold sleeve (1) and the second mold sleeve (2) via a second fixing bolt (41).

6. A fixture for connecting rod fatigue strength test according to any one of claims 1 to 5, characterized in that: One side of the first mold sleeve (1) is connected to the test device via a connecting piece (5), wherein the connecting piece (5) is fixedly connected to the first mold sleeve (1) via a flange (51).

7. A fixture for connecting rod fatigue strength test according to any one of claims 1 to 5, characterized in that: The outer surface of the first mold sleeve (1) is also provided with a groove (13) for reducing weight.

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