A belt pulley pitch position accuracy detection device

Abstract

The utility model discloses a kind of pulley groove pitch position precision detection devices, it is related to machining detection technical field, including support, pulley and two measuring shafts;Support is provided with reference surface, two measuring shaft holes are opened on reference surface, the position precision of support reference surface to measuring shaft hole is consistent with the position precision of pulley reference surface to wheel groove;Measuring shaft is set in measuring shaft hole, the cone angle of measuring shaft is consistent with pulley wheel groove angle, for with pulley wheel groove surface adhesion detection, without complex operation and professional instrument, compared with traditional general gauge or three coordinate measuring instrument, shorten single pulley detection time, significantly improve detection efficiency, and simple structure, low in manufacturing cost, can effectively avoid the processing error caused by inconvenient detection, ensure product quality, simultaneously adapt to the detection needs of different specifications pulley, provide convenient and efficient quality control means for production and processing.

Description

Technical Field

[0001] This utility model relates to the field of mechanical processing and testing technology, and in particular to a device for detecting the positional accuracy of pulley groove spacing. Background Technology

[0002] In the field of mechanical transmission, pulleys are key components for power transmission, and their manufacturing precision directly affects the operational stability and transmission efficiency of mechanical equipment. During the production of pulleys, the positional accuracy between the two grooves is a core quality indicator, directly determining whether the belt can accurately fit into the grooves and run smoothly without slippage or deviation. However, the current testing of the positional accuracy between the two grooves of pulleys faces numerous challenges.

[0003] Traditional inspection methods rely heavily on general-purpose measuring tools such as vernier calipers and micrometers. During inspection, operators must repeatedly adjust the tool positions and measure the relative distances and angles of the pulley grooves. This process is not only cumbersome but also highly susceptible to human error, with measurement errors reaching ±0.5mm. This falls short of the ±0.2mm tolerance requirements of modern high-precision pulleys (such as automotive engine pulleys and CNC machine tool transmission pulleys). Taking automotive engine pulley production as an example, inspecting a single pulley can take over 20 minutes, severely hindering production line efficiency. If defective products due to measurement errors flow into the assembly process, it can lead to abnormal wear of the engine belt, power transmission failure, and other problems, resulting in significant economic losses.

[0004] Some companies use coordinate measuring machines (CMMs) for inspection, which can ensure high accuracy. However, the equipment purchase cost can reach several million yuan, and the measurement requires complex clamping, positioning, and programming operations for the pulleys. A single inspection takes more than 15 minutes, resulting in high operating costs and low efficiency, making it unsuitable for small- to medium-batch production scenarios. Especially in small and medium-sized machining enterprises, frequent use of CMMs to inspect pulleys not only increases production costs but also extends production cycles due to equipment queuing.

[0005] With the increasing demands for precision in parts and components from intelligent manufacturing, and the urgent need for cost reduction and efficiency improvement in the machining industry, there is a pressing need for a special inspection tool that is easy to operate, fast to test, and cost-controllable, in order to solve the problems of low efficiency, large error, and poor applicability of existing testing technologies, and to achieve efficient and accurate testing of the groove position accuracy during the production of pulleys. Utility Model Content

[0006] To address the shortcomings of existing technologies, this utility model provides a device for detecting the positional accuracy of pulley grooves. Through the precise design of a dedicated bracket and measuring shaft, it solves the technical problems of cumbersome operation, low efficiency, high cost, and large errors when using traditional general-purpose measuring tools or coordinate measuring machines to detect the positional accuracy between the two grooves of a pulley, thus achieving fast, accurate, and low-cost detection.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A device for detecting the positional accuracy of a pulley groove includes a bracket, a pulley, and two measuring shafts. The bracket has a reference surface with two measuring shaft holes. The positional accuracy from the bracket reference surface to the measuring shaft holes is consistent with the positional accuracy from the pulley reference surface to the groove. The measuring shafts are set inside the measuring shaft holes, and the cone angle of the measuring shafts is consistent with the included angle of the pulley groove, for detecting contact with the pulley groove surface.

[0009] Preferably, the support is a plate-shaped structure, and the reference plane is one side plane of the support.

[0010] Preferably, the measuring hole is a through hole, the measuring shaft passes through the measuring hole, and the measuring shaft can move along the axial direction of the measuring hole.

[0011] Preferably, the measuring shaft includes a handheld part, a cylindrical part, and a conical part connected in sequence. The diameter of the handheld part is larger than the diameter of the measuring shaft hole. The cylindrical part is clearance-fitted with the measuring shaft hole, and the conical part is used to fit against the groove surface of the pulley.

[0012] Preferably, it also includes a positioning element, which is disposed on the bracket and used to position the bracket and the reference end face of the pulley during testing. The positioning element is a positioning protrusion or a positioning groove, and the reference end face of the pulley is provided with a positioning groove or positioning protrusion that cooperates with the positioning element.

[0013] Preferably, the bracket is equipped with scale lines, which are used to mark the position information of the measuring hole.

[0014] Preferably, the measuring axis is made of cemented carbide, and the bracket is made of aluminum alloy.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] This invention achieves rapid detection of the pulley groove spacing accuracy by ensuring a tight fit between the bracket reference surface and the pulley reference end face, and a precise fit between the measuring shaft cone and the pulley groove surface. The positional accuracy from the bracket reference surface to the measuring shaft hole strictly corresponds to the pulley design dimensions, and the angle of the measuring shaft cone is consistent with the included angle of the pulley groove, ensuring accurate detection reference and seamless fit. After quick positioning with the help of positioning components, operators can intuitively judge whether the groove spacing is qualified by observing the fit or gap size between the measuring shaft and the pulley groove. No complicated operation or professional instruments are required. Compared with traditional general measuring tools or coordinate measuring machines, it shortens the detection time of a single pulley, significantly improves detection efficiency, and has a simple structure and low manufacturing cost. It can effectively avoid processing errors caused by inconvenient detection, ensure product quality, and adapt to the detection needs of pulleys of different specifications, providing a convenient and efficient quality control method for production and processing. Attached Figure Description

[0017] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Legend: 1. Bracket; 2. Measuring axis; 3. Pulley. Detailed Implementation

[0020] This application provides a device for detecting the positional accuracy of pulley groove spacing, which solves the technical problems of cumbersome operation, low efficiency, high cost and large error when using traditional general-purpose measuring tools or coordinate measuring machines to detect the positional accuracy between the two grooves of a pulley, and achieves fast, accurate and low-cost detection.

[0021] Example

[0022] like Figure 1 As shown, the overall technical solution in this application embodiment is as follows:

[0023] To address the problems existing in the prior art, the following detailed description of the specific implementation of the pulley groove pitch position accuracy detection device of this utility model, in conjunction with the accompanying drawings and specific embodiments, will be provided.

[0024] Overall structural assembly of the detection device:

[0025] The pulley groove position accuracy detection device of this utility model mainly consists of a bracket 1 and two measuring shafts 2. The bracket 1 is made of aluminum alloy and is milled into a plate-like structure. One side plane of the bracket serves as a reference surface, and the flatness error of the reference surface is controlled within 0.01mm to ensure the accuracy of the detection reference. On the reference surface of the bracket 1, based on the position accuracy of the target pulley 3 from the reference surface to the groove, two measuring shaft holes are drilled using a high-precision CNC machining center. The position accuracy error of the two measuring shaft holes does not exceed ±0.02mm, ensuring strict correspondence with the design dimensions of the pulley 3.

[0026] The two measuring shafts 2 are made of cemented carbide and manufactured by turning and grinding. Their structure includes a handheld part, a cylindrical part, and a conical part connected in sequence. The handheld part has a diameter of 15mm for easy gripping by the operator. The diameter of the cylindrical part is 8mm, with a clearance fit tolerance of H7 / g6, ensuring that the measuring shaft 2 can move flexibly within the measuring shaft hole. The angle of the conical part is made according to the standard included angle of the pulley 3 groove, such as the common 34°, 36°, or 38°, and the surface roughness of the conical part reaches Ra0.8 to achieve a tight fit with the pulley 3 groove surface.

[0027] Specific implementation details of each component:

[0028] Bracket 1: A positioning element is fixedly installed on the non-reference surface side of bracket 1 using screws. The positioning element is in the form of a positioning protrusion, the shape of which matches the positioning groove pre-machined on the reference end face of pulley 3. The positioning protrusion is 5mm high and 8mm wide, and can accurately fit into the positioning groove of pulley 3, thereby quickly positioning bracket 1 and the reference end face of pulley 3 during inspection and avoiding relative displacement during the inspection process. In addition, graduation lines with an accuracy of 0.1mm are laser-engraved on the edge of bracket 1 to visually mark the position information of the measuring hole, facilitating quick confirmation and adjustment by operators before inspection of pulleys 3 of different specifications.

[0029] Measuring shaft 2: The handle of measuring shaft 2 has a knurled surface to increase friction and prevent slippage. The transition between the cylindrical and conical parts is rounded to avoid stress concentration. During actual assembly, measuring shaft 2 is inserted into the measuring shaft hole of bracket 1, ensuring that the cylindrical part completely passes through the measuring shaft hole and the handle rests against the surface of bracket 1. At this time, the conical part of measuring shaft 2 can freely extend out of the reference surface of bracket 1 for contact detection with the groove surface of pulley 3.

[0030] Operating procedures for the detection device:

[0031] Test preparation: Select a testing device with corresponding dimensional parameters according to the specifications of the pulley 3 to be tested. Clean the reference surface of the bracket 1 to ensure that there are no impurities such as oil stains and iron filings that may affect the fitting accuracy; at the same time, check whether there is wear or scratches on the surface of the conical part of the measuring shaft 2. If there are defects that affect the testing accuracy, replace or repair them in time.

[0032] Positioning and Installation: Place the pulley 3 stably on the workbench with the reference end face of the pulley 3 facing upwards. Hold the bracket 1 of the testing device and align the positioning protrusion on the bracket 1 with the positioning groove on the reference end face of the pulley 3. Slowly press down to make the reference surface of the bracket 1 fit tightly against the reference end face of the pulley 3, thus completing the positioning and installation of the testing device and the pulley 3.

[0033] Inspection Procedure: The operator holds the two handheld parts of the measuring shaft 2 and slowly inserts the conical part of the measuring shaft 2 into the groove of the pulley 3 along the axial direction of the measuring shaft hole. During insertion, the operator observes or uses auxiliary tools such as a feeler gauge to determine the fit between the conical part of the measuring shaft 2 and the groove surface of the pulley 3. If the conical part of the measuring shaft 2 fits seamlessly with the groove surface of the pulley 3 (no light transmission), or if the gap is within the tolerance range of the groove position accuracy of the pulley 3 (e.g., ±0.2mm), the groove spacing of the pulley 3 is considered acceptable. If the gap is greater than the tolerance range, the groove spacing does not meet the drawing requirements. The operator must immediately adjust the dimensions of the pulley 3 and re-inspect using this device until it is acceptable.

[0034] Post-inspection processing: After the inspection is completed, pull the measuring shaft 2 out of the pulley groove of the belt pulley 3, remove the inspection device, clean and maintain the inspection device, and prepare it for the next inspection.

[0035] Through the above specific embodiments, the pulley groove position accuracy detection device of this utility model can quickly and accurately detect the position of the three pulley grooves. Compared with traditional general measuring tools or three-coordinate measuring instruments, it greatly shortens the detection time, significantly improves detection efficiency and product quality, and effectively meets the detection needs in the production and processing process.

[0036] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A device for detecting the positional accuracy of pulley groove spacing, characterized in that, Includes a bracket (1), a pulley (3), and two measuring axes (2); The bracket (1) has a reference surface, and two measuring holes are opened on the reference surface. The positional accuracy of the reference surface of the bracket (1) to the measuring holes is consistent with the positional accuracy of the reference surface of the pulley (3) to the groove. The measuring shaft (2) is set inside the measuring shaft hole. The cone angle of the measuring shaft (2) is consistent with the groove angle of the pulley (3) and is used for contact detection with the groove surface of the pulley (3).

2. The pulley groove pitch position accuracy detection device as described in claim 1, characterized in that: The support (1) is a plate-shaped structure, and the reference plane is one side plane of the support (1).

3. The pulley groove pitch position accuracy detection device as described in claim 1, characterized in that: The measuring hole is a through hole, the measuring shaft (2) passes through the measuring hole, and the measuring shaft (2) can move along the axial direction of the measuring hole.

4. The pulley groove pitch position accuracy detection device as described in claim 1, characterized in that: The measuring shaft (2) includes a hand-held part, a cylindrical part and a conical part connected in sequence. The diameter of the hand-held part is larger than the diameter of the measuring shaft hole. The cylindrical part is clearance-fitted with the measuring shaft hole. The conical part is used to fit against the groove surface of the pulley (3).

5. The pulley groove pitch position accuracy detection device as described in claim 1, characterized in that: It also includes a positioning element, which is set on the bracket (1) and used to position the bracket (1) and the reference end face of the pulley (3) during testing.

6. The pulley groove pitch position accuracy detection device as described in claim 5, characterized in that: The positioning element is a positioning protrusion or a positioning groove, and the reference end face of the pulley (3) is provided with a positioning groove or positioning protrusion that cooperates with the positioning element.

7. The pulley groove pitch position accuracy detection device as described in claim 1, characterized in that: The bracket (1) is equipped with scale lines, which are used to mark the position information of the measuring hole.

8. The pulley groove pitch position accuracy detection device as described in claim 1, characterized in that: The measuring axis (2) is made of cemented carbide, and the bracket (1) is made of aluminum alloy.

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