Universal tool for detecting hardness of crankshaft

Abstract

The utility model relates to the field of detection tools, in particular to a universal tool for detecting the hardness of a crankshaft, which comprises a crank throw positioning head, an outer circle positioning head and a durometer body with a hardness detection function, a screw rod is vertically arranged on the durometer body in a penetrating manner, the screw rod is in threaded connection with a nut, and the nut is rotationally connected to the durometer body. A handle is fixed on the nut, an insertion hole is formed in the top end of the screw rod, a crank throw positioning head and an outer circle positioning head are inserted into the insertion hole, the crank throw positioning head and the outer circle positioning head respectively comprise a platform and an insertion head which is fixed at the bottom of the platform and used for being inserted into the insertion hole, the diameter of the platform is larger than that of the screw rod, and a vertical positioning block is fixed on the platform of the crank throw positioning head. And a V-shaped positioning groove is formed in the top of the positioning block. According to the utility model, the crank throw and the outer circle of the crankshaft can be detected, and the problem that the cost is high when two hardness meters are used for detecting respectively in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the field of detection tooling, and particularly relates to a general tooling for crankshaft hardness detection. Background Technique

[0002] Hardness detection is to press an indenter with a certain shape and size (such as a diamond cone or a quenched steel ball) into the material surface under a specified test force, and then determine the hardness of the material according to the depth of the indenter pressing into the specimen surface.

[0003] As one of the key components of the engine, the hardness of the crankshaft directly affects the performance and service life of the engine. After the production of the crankshaft is completed, it is necessary to conduct hardness detection on it to ensure that its quality meets the standards. The hardness detection of the crankshaft usually involves two parts: the crankpin and the outer circle. Due to the structural differences between the crankpin and the outer circle parts, two different hardness testers are usually required for detection respectively. Although this method has high efficiency, there are still the following problems in the actual application process: when one of the devices cannot be used due to special circumstances such as maintenance, the entire detection progress will be stagnated, affecting the normal progress and efficiency of the production line. Content of the Utility Model

[0004] The utility model aims to provide a general tooling for crankshaft hardness detection to realize the detection of the crankpin and the outer circle of the crankshaft, and solve the problem that the detection progress is stagnated when there are special circumstances such as equipment maintenance in the existing technology.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme:

[0006] The general tooling for crankshaft hardness detection includes a crankpin positioning head, an outer circle positioning head, and a hardness tester body with a hardness detection function. A screw rod is vertically penetrated through the hardness tester body. A nut is threadedly connected to the screw rod, and the nut is rotatably connected to the hardness tester body. A handle is fixed to the nut. A jack is opened at the top of the screw rod, and the jack is used for inserting the crankpin positioning head and the outer circle positioning head. Both the crankpin positioning head and the outer circle positioning head include a platform and a plug fixed to the bottom of the platform for inserting into the jack. The diameter of the platform is larger than the diameter of the screw rod. A vertical positioning block is fixed to the platform of the crankpin positioning head, and a V-shaped positioning groove is opened at the top of the positioning block.

[0007] Preferably, as an improvement, an outer protective sleeve is fixed to the top of the screw rod, and an inner protective sleeve is fixed to the top of the nut. The inner protective sleeve is sleeved outside the screw rod, and the outer protective sleeve is sleeved outside the inner protective sleeve.

[0008] Preferably, as an improvement, crankpin positioning marking lines and outer circle positioning marking lines are arranged on the inner protective sleeve.

[0009] Preferably, as an improvement, both the crankpin positioning marking lines and the outer circle positioning marking lines are solid lines but with different colors.

[0010] Preferably, as an improvement, a connecting pin is provided on the side of the hardness tester body. A support rod is rotatably connected to the connecting pin. A support plate for supporting the crankshaft when detecting the outer circle of the crankshaft is fixed on the support rod. A locking nut for locking the support plate is threadedly connected to the connecting pin. The support plate can be rotated to a horizontal state and can be flush with the outer circle positioning head after being rotated to the horizontal state.

[0011] The principle and beneficial effects of this solution are as follows:

[0012] 1. By equipping with a crank positioning head and an outer circle positioning head, this solution enables the two testing devices to be used together to separately detect the crank and the outer circle of the crankshaft, or when one testing device is being repaired, the crank and the outer circle can be detected on one device by replacing the crank positioning head and the outer circle positioning head. It has a wide range of applications and effectively solves the problem of testing stagnation caused by equipment repair.

[0013] 2. When detecting the crank, hang the crank on the positioning block, the journal of the crank is stuck in the positioning groove, and the crank arms on both sides of the journal are respectively located on both sides of the positioning block. Rotate the nut to drive the screw rod to rise until the journal of the crank abuts against the pressure head, and the positioning of the crankshaft can be completed. When detecting the outer circle of the crankshaft, place the outer circle of the crankshaft flat on the platform and then adjust the screw rod to rise until it abuts against the pressure head to complete the positioning of the crankshaft.

[0014] 3. In this solution, an inner protective sleeve is provided on the nut, and an outer protective sleeve is provided on the screw rod to cover the inner protective sleeve. This can not only protect the screw rod from impurities and dust entering the screw teeth and affecting the meshing of the nut and the screw rod, but also does not affect the lifting of the screw rod.

[0015] 4. Since the detection involves the switching of the positioning head, and the crank positioning head is longer than the outer circle positioning head due to the existence of the positioning block, after switching, the position of the screw rod needs to be readjusted. Currently, it depends on the operator to visually observe whether the position of the screw rod is appropriate. If it is considered appropriate, the crankshaft is placed between the positioning head and the pressure head. However, it is often impossible to adjust it in place at one time and requires multiple adjustments. The crankshaft needs to be placed multiple times for comparison, which is troublesome to operate. In order to adjust the position of the screw rod more accurately and quickly, this solution sets a crank positioning marking line and an outer circle positioning marking line on the inner protective sleeve. When adjusting, take the bottom end of the outer protective sleeve descending to the marking line as the standard, without the need for repeated adjustment, which can assist the operator to accurately and quickly adjust the position of the screw rod with high efficiency.

[0016] 5. When detecting the outer circle of a single-throw crankshaft, the crank throw part is in a suspended state. Therefore, when clamping, the operator needs to hold the crankshaft by hand to keep it horizontally clamped between the outer circle positioning head and the pressure head. However, since the crank throw part is suspended when clamping the outer circle part, it is difficult to keep the crankshaft horizontal, and the operator needs to support the crank throw by hand during the detection process. In this solution, a support rod and a support plate are provided. When detecting the outer circle of the crankshaft, the support rod and the support plate are rotated upward to a horizontal state flush with the outer circle positioning head. When clamping, the outer circle part of the crankshaft is placed on the outer circle positioning head, and the crank throw part is placed on the support plate. The support plate supports the crankshaft from the bottom, which can ensure that the crankshaft is stably placed horizontally, eliminating the need for the operator to hold the crankshaft by hand and facilitating the clamping and detection of the crankshaft. Description of the Drawings

[0017] Figure 1 Partial structural schematic diagram of an embodiment of the present invention.

[0018] Figure 2 Structural schematic diagram of the outer circle positioning head in an embodiment of the present invention.

[0019] Figure 3 Structural schematic diagram of the crank throw positioning head in an embodiment of the present invention.

[0020] Figure 4 Structural schematic diagram of the single-throw crankshaft targeted in an embodiment of the present invention.

[0021] Figure 5 Partial structural schematic diagram of Embodiment 3 of the present invention. Detailed Description of the Invention

[0022] The following is a further detailed description through specific embodiments:

[0023] The reference numerals in the drawings of the specification include: hardness tester body 1, pressure head 11, outer circle positioning head 2, platform 21, plug 22, crank throw positioning head 23, positioning block 24, positioning groove 25, outer protective sleeve 3, inner protective sleeve 31, outer circle positioning marking line 32, crank throw positioning marking line 33, nut 4, handle 41, support rod 5, support plate 51, locking nut 52, connecting pin 53, flush limit block 54, crankshaft 6, crank throw 61, outer circle 62.

[0024] Embodiment 1:

[0025] A general tooling for crankshaft hardness detection is applicable to Figure 4 the single-throw crankshaft 6 shown, and is also applicable to other crankshafts 6. This tooling includes Figure 3 the crank throw positioning head 23 shown in Figure 2 the outer circle positioning head 2 shown in Figure 1The hardness tester body 1 with a hardness detection function shown in the figure uses a hardness tester in the prior art, such as a Rockwell hardness tester. A screw rod is vertically penetrated through the hardness tester body 1, and a nut 4 is threadedly connected to the screw rod. The nut 4 is rotatably connected to the hardness tester body 1, and a handle 41 is welded to the nut 4. A jack is opened at the top end of the screw rod, and the jack is used for inserting a crank positioning head 23 and an outer circle positioning head 2. Both the crank positioning head 23 and the outer circle positioning head 2 include a platform 21 and a plug 22 welded to the bottom of the platform 21 for inserting into the jack. The diameter of the platform 21 is larger than the diameter of the screw rod. A vertical positioning block 24 is welded to the platform 21 of the crank positioning head 23, and a V-shaped positioning groove 25 is opened at the top of the positioning block 24. A connecting pin 53 is fixed to the side of the hardness tester body 1, a support rod 5 is rotatably sleeved on the connecting pin 53, a support plate 51 is welded to the support rod 5, and a locking nut 52 is threadedly connected to the connecting pin 53. After the support plate 51 rotates to the horizontal state, it can be flush with the outer circle positioning head 2.

[0026] An outer protective sleeve 3 is fixed to the top end of the screw rod by screws, and an inner protective sleeve 31 is welded to the top of the nut 4. The inner protective sleeve 31 is sleeved outside the screw rod, and the outer protective sleeve 3 is sleeved outside the inner protective sleeve 31. The inner protective sleeve 31 is provided with a crank positioning marking line 33 and an outer circle positioning marking line 32. Both the crank positioning marking line 33 and the outer circle positioning marking line 32 can be annular marking lines drawn along the circumferential direction of the inner protective sleeve 31, or can be marking lines only drawn in front of the inner protective sleeve 31. The crank positioning marking line 33 and the outer circle positioning marking line 32 can be distinguished by line types. For example, one is a dotted line and the other is a solid line, or one is a thick line and the other is a thin line; the crank positioning marking line 33 and the outer circle positioning marking line 32 can also be of the same line type and distinguished by colors. The specific distinguishing method is not limited in this embodiment. The setting positions of the crank positioning marking line 33 and the outer circle positioning marking line 32 refer to the following standard: when the distance between the crank positioning head 23 (outer circle positioning head 2) and the indenter 11 enables the crankshaft 6 to be placed, and the distance between the crankshaft 6 and the indenter 11 is the smallest, in this way, the screw rod can be adjusted fastest so that the crankshaft 6 abuts against the indenter 11. The crank positioning marking line 33 and the outer circle positioning marking line 32 in the drawings are only for illustration, and the positions of the crank positioning marking line 33 and the outer circle positioning marking line 32 are set according to the model of the crankshaft 6 during actual use.

[0027] The working principle of the general tooling for hardness detection of the crankshaft 6 is as follows:

[0028] In this embodiment, Figure 4Taking the single-throw crankshaft 6 shown as an example for detection, when detecting the crank throw 61 of the crankshaft 6, insert the crank throw positioning head 23 onto the screw rod, rotate the nut 4, and directly lower the adjusting screw rod until the bottom end of the inner protective sleeve 31 reaches the crank throw positioning marking line 33. The positioning marking line 33 gives a mark, so that the user does not need to repeatedly stop and put the product in for comparison during the adjustment process, and the adjustment efficiency is higher. Hang the crankshaft 6 on the crank throw positioning head 23 from the crank throw 61, then rotate the nut 4 in the reverse direction, and adjust the screw rod to rise until the crank throw 61 abuts against the indenter 11. Drive the hardness tester body 1 to apply a preset pressure to the indenter 11 to detect the crank throw 61.

[0029] When detecting the outer circle 62 of the crankshaft 6, insert the outer circle positioning head 2 onto the screw rod, rotate the nut 4, adjust the screw rod to lower until the bottom end of the inner protective sleeve 31 reaches the outer circle positioning marking line 32. Place the left end outer circle 62 of the crankshaft 6 flat on the outer circle positioning head 2, then rotate the nut 4 in the reverse direction, adjust the screw rod to rise until the outer circle 62 of the crankshaft 6 abuts against the indenter 11. Finally, loosen the locking nut 52, turn the support rod 5 upward to the horizontal state and then tighten the locking nut 52 to abut against the support plate 51. At this time, the support plate 51 and the outer circle positioning head 2 are flush, and the support plate 51 supports the other end of the crankshaft 6 to prevent the unclamped part of the crankshaft 6 from hanging in the air and improve the detection stability of the crankshaft 6. Drive the hardness tester body 1 to apply a preset pressure to the indenter 11 to detect the outer circle 62 of the crankshaft 6.

[0030] Embodiment 2:

[0031] The difference between this embodiment and Embodiment 1 is that the support rod 5 is provided with an annular threaded hole coaxially arranged with the connecting pin 53. The outer wall of the locking nut 52 is provided with an external thread that can mesh with the threaded hole. After the support plate 51 is rotated to the horizontal state, tighten the locking nut 52 so that the locking nut 52 is screwed into the threaded hole, thereby locking the support rod 5 with good locking effect.

[0032] Embodiment 3:

[0033] As Figure 5 shown, the difference between this embodiment and Embodiment 1 is that a horizontal flush limit block 54 is fixed to the left side of the connecting pin 53 by bolts. Each time the support rod 5 is rotated to abut against the flush limit block 54, it means that the support plate 51 is rotated to the horizontal state, and then the locking nut 52 can be tightened, which is convenient to operate.

[0034] The above are only embodiments of the present utility model, and common general technical solutions and / or characteristics in the solutions are not described in detail herein. It should be noted that for those skilled in the art, without departing from the technical solution of the present utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the present utility model, and these will not affect the implementation effect of the present utility model and the practicability of the patent. The protection scope claimed in this application shall be subject to the content of its claims, and the specific implementation manners and the like recorded in the specification can be used to interpret the content of the claims.

Claims

1. Universal tooling for crankshaft hardness testing, characterized by: It includes a crank positioning head, an outer cylindrical positioning head and a hardness tester body with a hardness detection function. A screw is vertically passed through the hardness tester body. A nut is threadedly connected to the screw. The nut is rotatably connected to the hardness tester body. A handle is fixed on the nut. A socket is provided at the top of the screw. The socket is used to plug in the crank positioning head and the outer cylindrical positioning head. Both the crank positioning head and the outer cylindrical positioning head include a platform and a plug fixed at the bottom of the platform for inserting into the socket. The diameter of the platform is larger than the diameter of the screw. A vertical positioning block is fixed on the platform of the crank positioning head. A V-shaped positioning groove is provided on the top of the positioning block.

2. The universal tool for testing crankshaft hardness according to claim 1, characterized in that: An outer protective sleeve is fixed on the top of the screw rod, an inner protective sleeve is fixed on the top of the nut, the inner protective sleeve is sleeved outside the screw rod, and the outer protective sleeve is sleeved outside the inner protective sleeve.

3. The universal tool for testing crankshaft hardness according to claim 2, characterized in that: The inner protective sleeve is provided with a crank positioning mark line and an outer circle positioning mark line.

4. The universal tooling for crankshaft hardness testing according to claim 3 is characterized in that: The crank positioning markings and the outer circle positioning markings are both solid lines but in different colors.

5. The universal tool for testing crankshaft hardness according to claim 4, characterized in that: A connecting pin is provided on the side of the hardness tester body, and a support rod is rotatably connected to the connecting pin. A support plate for supporting the crankshaft when detecting the outer circle of the crankshaft is fixed on the support rod. A locking nut for locking the support plate is threadedly connected to the connecting pin. The support plate can be rotated to a horizontal state and can be flush with the outer circle positioning head after rotating to the horizontal state.

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