Magnetic attraction tool

Abstract

The utility model discloses a magnetic attraction tool which comprises a fixing base, a plurality of threaded fixing holes evenly formed around a center shaft, a plurality of magnets embedded into the corresponding threaded fixing holes and a magnetic attraction device used for attracting a workpiece placed on the upper end face of the fixing base. The screws are embedded into the corresponding threaded fixing holes, abut against the magnets and are in threaded fit with the threaded fixing holes; the clamping efficiency can be improved, so that the testing efficiency is improved, the surface of the workpiece is prevented from being scratched, indented and the like in the clamping process, the workpiece can be precisely positioned, and the precision of a detection result is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of balancing machine testing technology, and in particular relates to a magnetic suction fixture. Background Technology

[0002] In the field of balancing machine applications, after the workpiece is fixed onto the spindle of the balancing machine using tooling, the spindle motor drive system reaches a preset speed (typically 500-3000 RPM). At this speed, the imbalance generates a periodic centrifugal force vector, the amplitude and phase angle of which are captured by a high-precision vibration sensor. The balancing machine detects whether the workpiece's mass distribution is uneven by rotating the workpiece at high speed using the centrifugal force effect. However, existing tooling mostly uses traditional mechanical clamping methods, such as using jigs and bolts to fix the workpiece. This method is inefficient and cumbersome, and may also cause scratches, indentations, and other damage to the workpiece surface, which is extremely detrimental to workpieces with high surface quality requirements. Furthermore, existing tooling cannot perform precise positioning and automatic alignment, resulting in the workpiece not being centered on the tooling during fixing, leading to significant errors during the detection process. A new tooling technology is urgently needed to solve this problem. Utility Model Content

[0003] (I) Purpose of the utility model

[0004] In order to overcome the above shortcomings, the purpose of this utility model is to provide a magnetic suction fixture to solve the technical problems of existing fixtures used for balancing machine testing, such as cumbersome clamping operation leading to low testing efficiency, easy scratches and indentations on the workpiece surface during clamping, inability to accurately position the workpiece leading to errors in the testing process.

[0005] (II) Technical Solution

[0006] To achieve the above objectives, the technical solution provided in this application is as follows:

[0007] A magnetic suction fixture includes: a fixed base with multiple threaded fixing holes evenly distributed around a central axis; multiple magnets embedded in the corresponding threaded fixing holes for attracting workpieces placed on the upper surface of the fixed base; and multiple screws embedded in the corresponding threaded fixing holes, which are pressed against each other with the magnets and threadedly engaged with the threaded fixing holes.

[0008] The magnetic clamping fixture of this application only requires bringing the workpiece close to the magnetic body, and the magnetic force of the magnets can quickly complete the clamping, greatly saving clamping time and significantly improving overall work efficiency. Because the magnets are evenly distributed around the central axis, the magnetic force acts uniformly on the workpiece, allowing the workpiece to automatically align itself during the clamping process. In balancing machine measurements, clamping errors are significantly reduced, improving the positioning accuracy of the workpiece on the balancing machine, and thus significantly improving the accuracy of balancing measurements. This fixture uses magnetic force to attract the workpiece, avoiding direct contact and compression between the clamp and the workpiece surface during mechanical clamping, preventing potential scratches, indentations, and other damage. For parts with high surface quality requirements, it can effectively protect their surface integrity and reduce the defect rate. Furthermore, by changing magnets of different lengths (different lengths of magnets have different volumes and different attraction forces), it can stably attract workpieces of different sizes and weights, exhibiting strong versatility and flexibility.

[0009] Furthermore, a positioning pin is vertically provided at the center of the upper end face of the fixed base, which is inserted into the center hole of the workpiece;

[0010] The positioning pin engages with the center hole of the workpiece, providing a precise positioning reference for the workpiece. During clamping, this further improves the positioning accuracy of the workpiece and ensures that the workpiece is accurately positioned on the fixed base.

[0011] Furthermore, it also includes: multiple calibration weight magnets that are attracted to the side of the fixed base for adjusting the dynamic balance of the magnetic suction fixture;

[0012] When the balancing machine performs dynamic balancing correction on the magnetic fixture, the correction weight magnet is adsorbed at the corresponding position on the side of the fixed base according to the test results of the balancing machine. Since the correction weight magnet is fixed by adsorption, it can be moved and adjusted at any angle on the fixed base according to the test results of the balancing machine. The operation is simple and quick, without the need for complicated disassembly and reinstallation.

[0013] Furthermore, the threaded fixing hole has openings at both ends, with the opening at the end closest to the upper surface of the fixing seat being smaller than the diameter of the magnet.

[0014] This structure allows the magnetic force to act more concentrated on the workpiece, improving the adsorption capacity and enhancing the firmness of the workpiece clamping. It can effectively prevent the workpiece from shifting during processing or measurement due to weak adsorption, ensuring the smooth progress of processing and measurement.

[0015] Furthermore, multiple connection holes are provided around the central axis and through the fixed base to connect the fixed base to the main shaft of the balancing machine;

[0016] The circumferential arrangement of the connecting holes allows the fixed seat to be connected to the spindle of the balancing machine with uniform force, ensuring the stability of the magnetic fixture on the balancing machine.

[0017] Furthermore, a positioning hole is provided at the center of the lower end face of the fixed base for the insertion of the main spindle of the balancing machine;

[0018] The fit between the positioning hole and the spindle of the balancing machine further improves the accuracy and reliability of the magnetic fixture installation. During the operation of the balancing machine, it ensures that the fixture and workpiece rotate synchronously with the spindle, reducing vibration and errors caused by unstable installation, and improving the accuracy and reliability of balance measurement. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the magnetic suction tool of this utility model;

[0020] Figure 2 This is a cross-sectional view of the magnetic suction tool of this utility model;

[0021] Figure 3 This is an exploded view of the magnetic suction tooling of this utility model;

[0022] Figure 4 This is a schematic diagram of the structure of the fixed base in the magnetic suction tool of this utility model.

[0023] Figure label:

[0024] 1. Fixing base; 101. Threaded fixing hole; 102. Positioning pin; 103. Connecting hole; 104. Positioning hole; 2. Magnet for adsorbing workpiece; 3. Screw; 4. Calibration weight magnet. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0026] The present invention provides a magnetic suction fixture, comprising: a fixed base 1, with a plurality of threaded fixing holes 101 evenly provided around a central axis, a plurality of workpiece magnets 2 embedded in the corresponding threaded fixing holes 101 for adsorbing workpieces placed on the upper surface of the fixed base 1, and a plurality of screws 3 embedded in the corresponding threaded fixing holes 101 and pressed against each other with the workpiece magnets 2 and threadedly engaged with the threaded fixing holes 101.

[0027] The core structure of this magnetic suction fixture adopts a multi-layer nested design. The fixing base 1, as the load-bearing component, is preferably made of high-strength aluminum alloy, and multiple threaded fixing holes 101 evenly distributed circumferentially are arranged radially. Before inspection, the operator first inserts the cylindrical workpiece magnet 2 into the corresponding threaded fixing hole 101, and then screws the stainless steel adjusting screw 3 into the threaded fixing hole 101 to abut against the workpiece magnet 2. At this time, tightening the screw 3 can axially lock the workpiece magnet 2.

[0028] Specifically, in practical applications, when the workpiece is close to the surface of the fixed base 1, the superimposed magnetic field generated by multiple workpiece magnets 2 can form a uniform adsorption force field, which is particularly suitable for the rapid clamping of ring-shaped and disc-shaped workpieces.

[0029] Preferably, a positioning post 102 is provided at the center of the fixing base 1 on the basic magnetic attraction structure. It can be positioned by passing through the center hole of the workpiece.

[0030] Preferably, the upper part of the positioning post 102 can be precisely machined with a guide taper, with the taper angle controlled within the range of 15-20°. When the operator places the workpiece, the positioning post 102 can automatically guide the workpiece's center hole to achieve initial positioning, and then magnetic adsorption completes the final fixation.

[0031] Specifically, the positioning pin 102 and the fixed base 1 are detachably connected, for example, by interference fit. For workpieces with a center hole, the positioning pin 102 can be installed for initial positioning. For workpieces without a center hole, the positioning pin 102 can be removed.

[0032] Specifically, before balancing the workpiece, a dynamic balance test of the fixture is required. The fixture is first connected to the spindle of the balancing machine. The rotation of the spindle drives the fixture to rotate. During rotation, the internal detection system of the balancing machine detects whether the fixture is balanced and provides the phase angle deviation position. The operator then installs the correction weight at the corresponding position based on the given phase angle deviation. Specifically, existing fixtures typically have holes drilled around their circumference on the side for correction by inserting corresponding weights. However, the correction weight in this application is a correction magnet 4, which can be quickly attached to the outer side of the fixed base 1 via magnetic attraction. During the balance test, when a phase angle deviation of the fixture is detected, the technician can, based on the feedback data from the balancing machine, attach the correction magnet 4 along the circumferential direction to the specified angle position. It is worth noting that the correction weight is designed as a detachable and combinable structure. Individual correction magnets 4 come in three weights: 50g, 100g, and 200g, allowing for precise matching of balance adjustment needs at the 0.5g level through different combinations.

[0033] Preferably, this application further optimizes the threaded fixing hole 101. The threaded fixing hole 101 adopts a two-end opening form, with the upper entrance precision machined to form a constricted structure, and the hole diameter is reduced by 0.1-0.2 mm compared to the diameter of the magnet 2 adsorbing the workpiece. This design forms a mechanical limit after the magnet 2 adsorbing the workpiece is installed, preventing the magnet 2 from falling out during high-speed rotation. At the same time, the upper opening makes the magnetic field lines more concentrated at the exit, and actual measurements show that it can increase the effective magnetic flux density by 15%-20%.

[0034] Specifically, the main shaft of the balancing machine is a circular boss structure.

[0035] Specifically, the fixed base 1 has connecting holes 103 arranged in a uniform circumferential pattern, with the hole spacing angle controlled at 90° intervals around the circumference. Fixing screws, in conjunction with elastic washers, lock the fixed base 1 onto the spindle of the fixed base 1. Additionally, a positioning hole 104 is provided at the center of the lower end face of the fixed base 1 for the insertion of the balancing machine spindle. Through the dual engagement of the connecting holes 103 and the positioning hole 104, the fixture can be stably fixed onto the balancing machine spindle.

[0036] Specifically, when installing the workpiece onto the fixture, the operator first selects an appropriate number of workpiece magnets 2 based on the workpiece size. If the workpiece is heavy and bulky, a longer workpiece magnet 2 with greater adsorption force is selected, along with a shorter screw 3. The screw 3 is then tightened into the threaded fixing hole 101 using a screwdriver. During the workpiece placement stage, the synergistic effect of the central positioning post 102 and the magnetic field of the workpiece magnets 2 achieves automatic centering with millimeter-level precision. During the dynamic balancing test, the vibration data collected in real time by the balancing machine is fed back to the control system via the transmission module.

[0037] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A magnetic tooling fixture, characterized by, include: The fixing base (1) has a plurality of threaded fixing holes (101) evenly distributed around its central axis. A plurality of workpiece magnets (2) are embedded in the corresponding threaded fixing holes (101) to attract workpieces placed on the upper surface of the fixing base (1). A plurality of screws (3) are embedded in the corresponding threaded fixing holes (101) and pressed against each other with the workpiece magnets (2) and threadedly engaged with the threaded fixing holes (101).

2. The magnetic tooling fixture of claim 1, wherein, The fixed base (1) has a vertically oriented positioning post (102) at the center of its upper end face, which is inserted into the center hole of the workpiece.

3. The magnetic tool holder of claim 1 or 2, wherein, Also includes: Multiple calibration weight magnets (4) are adsorbed onto the side of the fixed base (1) for adjusting the dynamic balance of the magnetic suction fixture.

4. The magnetic tool holder of claim 1, wherein, The threaded fixing hole (101) has openings at both ends, and the opening at the end closer to the upper surface of the fixing seat (1) is smaller than the diameter of the magnet (2) that attracts the workpiece.

5. The magnetic tooling fixture of claim 1, wherein, A plurality of connection holes (103) are provided around the central axis of the fixed base (1) and through the fixed base (1) to connect the fixed base (1) to the main shaft of the balancing machine.

6. The magnetic suction fixture according to claim 5, characterized in that, A positioning hole (104) for inserting the spindle of the balancing machine is provided at the center of the lower end face of the fixed base (1).

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