Device for testing perpendicularity of screw hole of crane

Abstract

According to the device for testing the perpendicularity of the screw hole of the crane, after the positioning rod penetrates through the central through hole of the detection ring, the lower end of the positioning rod is in threaded connection with the screw hole of the flange face, the detection ring is attached to the flange face, then the detection ring is fixed to the flange face through the fixing piece, and the perpendicularity of the screw hole of the crane is tested. Then the rotating rod sleeves the positioning rod, and the dial indicator is mounted at one end, far away from the positioning rod, of the rotating rod through the locking piece, so that the rotating rod drives the dial indicator to rotate in the upper end surface area of the outer ring body, whether the perpendicularity of the screw hole of the flange surface meets the requirement or not is judged according to the numerical value of the dial indicator, and accurate testing can be performed.

Description

Technical Field

[0001] The utility model relates to the technical field of screw hole testing, in particular to a testing device for the verticality of a crane screw hole. Background Art

[0002] In the process of mechanical design, the connection between workpieces often requires the design of screw holes, and then the workpieces are connected by bolts. The connecting rod in the engine of the crane is used to connect the piston and the crankshaft. The screw holes on the connecting rod body must have good verticality to achieve the connection between the connecting rod big head cover and the connecting rod body. In order to measure the verticality of the screw holes, a patent document with Chinese patent number 202221111052.2 and announcement date of 2022.09.13 discloses a connecting rod screw hole verticality detection device, including a base, a detection plate, a rotating positioning member and a micrometer. The side wall of the base is provided with a locking device for fixing the connecting rod body, and the detection plate is provided with two through holes, and the two through holes are arranged corresponding to the two screw holes on the connecting rod body; the rotating positioning member includes a positioning bolt and a rotating arm, the positioning bolt is provided with an external thread matching the screw hole, and a rotating table is provided on the positioning bolt. A micrometer is fixed to one end of the rotating arm, and the other end of the rotating arm is sleeved on the rotating table.

[0003] The above-mentioned document fixes the connecting rod on the base, places the detection plate above the connecting rod body, and installs the micrometer through the positioning bolt and the rotating arm. The micrometer is used to measure the detection plate to detect the verticality of the screw hole relative to the end face of the connecting rod body. It only detects the screw holes of smaller parts and is not suitable for large assembly workpieces, such as the large screw hole detection connecting the boom tower flange surface of the marine crane and the slewing platform. Since the connecting rod is used to install the micrometer in the above-mentioned document, if the large screw hole detection is performed, since a large screw is installed, the screw hole is large and its active surface is large, it is necessary to detect the verticality of the screw hole at a position with a large distance from the screw hole. In addition, the detection plate at the bottom of the above-mentioned document is a plate structure. If there is a protrusion on the detection platform, the detection panel will be unevenly installed, resulting in inaccurate detection. At the same time, in order to detect the verticality of the screw hole, it is generally necessary to ensure that the screw hole is aligned with the center through hole, and then determine the starting position and the end position to facilitate detection. Utility Model Content

[0004] The purpose of the utility model is to provide a testing device for the verticality of a screw hole of a crane, which is convenient for measurement, has a long service life, high precision and small error, and is easy to disassemble and assemble.

[0005] To achieve the above-mentioned purpose, a testing device for the verticality of screw holes is provided, which is used for screw hole detection on the flange surface of the boom tower body, including a detection ring, a positioning rod, a rotating rod and a dial indicator. The detection ring includes an inner ring body and an outer ring body. After the inner ring body is fixedly connected to the outer ring body by a connecting rod, two or more connecting rods are formed between the inner ring body and the outer ring body, and a hollow structure is formed between the two connecting rods. The width of the connecting rod is equal to the width of the rotating rod. A central through hole is provided on the inner ring body. The lower end of the positioning rod passes through the central through hole to fit the detection ring on the flange surface. The rotating rod is sleeved on the upper end of the positioning rod. The length of the rotating rod matches the radius of the detection ring. The dial indicator is fixed to the end of the rotating rod away from the positioning rod by a locking piece. The rotating rod drives the dial indicator to rotate in the upper end surface area of ​​the outer ring body.

[0006] The above setting is not convenient for detection because the width of the flange surface is small, that is, the sliding area is small. By setting the detection ring to fit completely with the flange surface, the detection ring can replace the flange surface. In this way, when the detection ring is placed on the flange surface, if a bulge appears on the flange surface, the detection ring can be rotated to make the hollow structure correspond to the bulge, thereby avoiding the bulge on the flange surface between the screw holes, so that the verticality detection of the screw holes is not affected by the bulge on the flange surface between the screw holes. In addition, the rotation position of the rotating rod can be judged by whether the width of the connecting rod and the rotating rod between the inner ring body and the outer ring body is aligned, thereby facilitating detection. At the same time, the setting of the hollow structure reduces the weight of the detection ring, facilitates the disassembly and assembly of the detection ring, and finally the verticality of the screw holes on the flange surface meets the requirements by accurately detecting the value of the dial indicator, with high detection accuracy.

[0007] Furthermore, the upper end of the positioning rod is configured as a screw rod, and the lower end of the positioning rod is configured as a bolt that matches the screw hole on the flange surface.

[0008] The above arrangement facilitates that the lower end of the positioning rod can completely match the screw hole of the flange surface for threaded connection after passing through the detection ring, so that the detection ring fits the flange surface.

[0009] Furthermore, one end of the rotating rod close to the positioning rod is provided with a through hole matching the screw rod, and the rotating rod is sleeved on the screw rod through the through hole.

[0010] The above arrangement enables the rotating rod to be sleeved on the screw rod and rotate around the screw rod.

[0011] Furthermore, the end of the rotating rod away from the positioning rod is provided with a mounting hole matching the dial indicator, and gaps connected to the mounting holes are provided on both sides of the mounting hole, and the locking piece passes through from one side of the rotating rod to the other side of the rotating rod.

[0012] The above arrangement facilitates the installation of the dial indicator on the rotating rod and fixes it through the gap of the locking piece, so that the dial indicator can rotate synchronously with the rotating rod.

[0013] Furthermore, a fixing piece is provided between the rotating rod and the detection ring, the fixing piece is threadedly connected to the lower end of the positioning rod, and a gasket is provided between the fixing piece and the upper end surface of the inner ring body.

[0014] The above arrangement can prevent the fixing member from wearing the detection ring when the detection ring is fixed by the fixing member, thereby playing a buffering role.

[0015] Furthermore, a limiting piece is provided at the upper end of the rotating rod, and the limiting piece is threadedly connected to the upper end of the positioning rod.

[0016] With the above arrangement, after the rotating rod is sleeved on the positioning rod, the limiting member can limit the movement of the rotating rod in the direction of the vertical axis of the positioning rod.

[0017] Furthermore, the radius of the detection ring is greater than the distance from the central through hole to the mounting hole, and the distance from the central through hole to the mounting hole is greater than the length of the rotating rod.

[0018] The above arrangement can ensure that the dial indicator can realize sliding detection on the upper end surface of the outer ring body. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the main view of the present utility model.

[0020] Figure 2 It is a top view of the utility model.

[0021] Figure 3 It is a structural diagram of the detection ring in the utility model.

[0022] Figure 4 for Figure 2 Enlarged view of point A in the middle. DETAILED DESCRIPTION

[0023] The present invention will be described in further detail below with reference to the accompanying drawings and specific implementations.

[0024] like Figures 1 to 4 As shown, a device for testing the verticality of screw holes of cranes is used for detecting screw holes on the flange surface of the boom tower body, including a detection ring, a positioning rod 1, a rotating rod 2 and a dial indicator 3. The detection ring includes an inner ring body 41 and an outer ring body 42. Figure 3As shown, more than two connecting rods 43 are provided on the outer side of the inner ring body 41. In this embodiment, eight connecting rods 43 are provided. After the inner ring body 41 is fixedly connected to the outer ring body 42 through the connecting rods 43, more than two connecting rods 43 are formed between the inner ring body 41 and the outer ring body 42. A hollow structure 46 is formed between two adjacent connecting rods 43. A central through hole 44 is provided on the inner ring body 41. In this way, when the detection ring is placed on the flange surface 5, if there is a protrusion on the flange surface 5, the detection ring can be rotated to align the hollow structure 46 with the protrusion, thereby avoiding the protrusion on the flange surface 5 between the screw holes 6 and the screw holes 6, so that the verticality detection of the screw holes 6 is not affected by the protrusion on the flange surface 5 between the screw holes 6 and the screw holes 6. At the same time, the width of the connecting rod 43 is equal to the width of the rotating rod 2, which can also be convenient for observation. The connecting rod 43 corresponding to the rotating rod 2 determines the rotation position, thereby facilitating testing. At the same time, the setting of the hollow structure 46 reduces the weight of the detection ring and facilitates the disassembly and assembly of the detection ring. The lower end of the positioning rod 1 passes through the center through hole 44 to fit the lower end face of the detection ring on the flange surface 5. In this embodiment, the lower end of the positioning rod 1 is set as a bolt that matches the screw hole 6 of the flange surface 5. This makes it convenient for the lower end of the positioning rod 1 to pass through the detection ring and be completely threadedly matched with the screw hole 6 of the flange surface 5 so that the detection ring fits the flange surface 5. The rotating rod 2 is sleeved on the upper end of the positioning rod 1, and the upper end of the positioning rod 1 is set as a screw. The end of the rotating rod 2 close to the positioning rod 1 is provided with a through hole matching the screw. The rotating rod 2 is sleeved on the screw through the through hole, so that the rotating rod 2 can rotate around the screw. The dial indicator 3 is fixed to the end of the rotating rod 2 away from the positioning rod 1 by a locking member. Figure 4 As shown, there are two locking pieces, and a mounting hole 7 matching the dial indicator 3 is provided at one end of the rotating rod 2 away from the positioning rod 1. Gaps 8 communicating with the mounting holes 7 are provided on both sides of the mounting hole 7. The locking piece passes through from one side of the rotating rod 2 to the other side of the rotating rod 2. The locking piece includes a slotted pan head screw 51 and a nut 52 for the slotted pan head screw 51, thereby facilitating the installation of the dial indicator 3 on the rotating rod 2 and fixing it through the locking piece, so that the dial indicator 3 can rotate synchronously with the rotating rod 2. In this embodiment, the positioning rod 1 includes an upper end, a middle part and a lower end, wherein the upper end and the lower end are both provided with threads, and the middle part is a rod body structure.

[0025] In this embodiment, the length of the rotating rod 2 is matched with the radius of the detection ring. Figure 2 As shown, the radius d1 of the detection ring is greater than the distance d2 from the center through hole 44 to the mounting hole 7, and the distance d2 from the center through hole 44 to the mounting hole 7 is greater than the length d3 of the connecting rod 43. This can ensure that the rotating rod 2 drives the pointer of the dial indicator 3 to rotate in the upper end surface area 45 of the outer ring body 42.

[0026] like Figure 1As shown, a fixing part 9 is provided between the rotating rod 2 and the detection ring, and the fixing part 9 is threadedly connected to the lower end of the positioning rod 1. A gasket 10 is provided between the fixing part 9 and the upper end surface of the inner ring body 41. In this way, when the detection ring is fixed by the fixing part 9, the fixing part 9 can be prevented from wearing the detection ring, thereby playing a buffering role. In this embodiment, the fixing part 9 is a nut that matches the bolt.

[0027] like Figure 1 As shown, a limit member 11 is provided at the upper end of the rotating rod 2, and the limit member 11 is threadedly connected to the upper end of the positioning rod 1. After the rotating rod 2 is sleeved on the positioning rod 1, the limit member 11 can limit the movement of the rotating rod 2 in the direction of the vertical axis 12 of the positioning rod 1. In this embodiment, the limit member 11 is a nut that matches the screw rod.

[0028] The working principle of the present invention is as follows: after the positioning rod 1 passes through the central through hole of the detection ring, the lower end of the positioning rod 1 is threadedly connected to the screw hole of the flange surface, thereby fitting the detection ring to the flange surface, and then fixing the detection ring to the flange surface through the fixing part, and then the rotating rod 2 is sleeved on the positioning rod 1, and the dial indicator 3 is installed through the locking part at the end of the rotating rod 2 away from the positioning rod 1, so that the rotating rod drives the dial indicator 3 to rotate in the upper end surface area of ​​the outer ring body, and then the difference in the values ​​of the dial indicator 3 is used to judge whether the verticality of the screw hole on the flange surface meets the requirements. For example, if the measured value on the dial indicator 3 is within the preset deviation range, it can be determined that the verticality of the screw hole meets the requirements. The measurement principle of the dial indicator 3 is the existing technology and will not be repeated here.

Claims

1. A device for testing the verticality of screw holes in cranes, used for detecting screw holes on the flange surface of a boom tower, comprising a detection ring, a positioning rod, a rotating rod, and a dial indicator, characterized in that: The detection ring includes an inner ring body and an outer ring body. After the inner ring body is fixedly connected to the outer ring body by a connecting rod, more than two connecting rods are evenly arranged in a circle between the inner ring body and the outer ring body. A hollow structure is formed between the two connecting rods. The width of the connecting rod is equal to the width of the rotating rod. A central through hole is provided on the inner ring body. The lower end of the positioning rod passes through the central through hole to fit the detection ring on the flange surface. The rotating rod is sleeved on the upper end of the positioning rod. The length of the rotating rod matches the radius of the detection ring. The dial indicator is fixed to the end of the rotating rod away from the positioning rod by a locking piece. The rotating rod drives the dial indicator to rotate in the upper end face area of ​​the outer ring body.

2. A device for testing the verticality of a crane screw hole according to claim 1, characterized in that: The upper end of the positioning rod is set as a screw rod, and the lower end of the positioning rod is set as a bolt matching the screw hole of the flange surface.

3. The device for testing the verticality of a crane screw hole according to claim 1, characterized in that: One end of the rotating rod close to the positioning rod is provided with a through hole matching the screw rod, and the rotating rod is sleeved on the screw rod through the through hole.

4. A device for testing the verticality of a crane screw hole according to claim 3, characterized in that: The end of the rotating rod away from the positioning rod is provided with a mounting hole matching the dial indicator, and gaps communicating with the mounting holes are provided on both sides of the mounting hole. The locking piece passes through from one side of the rotating rod to the other side of the rotating rod.

5. A device for testing the verticality of screw holes of a crane according to claim 4, characterized in that: A fixing piece is provided between the rotating rod and the detection ring. The fixing piece is threadedly connected to the lower end of the positioning rod. A gasket is provided between the fixing piece and the upper end surface of the inner ring body.

6. A device for testing the verticality of screw holes of a crane according to claim 5, characterized in that: The upper end of the rotating rod is provided with a limiting piece, which is threadedly connected to the upper end of the positioning rod.

7. The device for testing the verticality of screw holes of a crane according to claim 5, characterized in that: The radius of the detection ring is greater than the distance from the central through hole to the mounting hole, and the distance from the central through hole to the mounting hole is greater than the length of the rotating rod.

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