A device for measuring the symmetry precision of a machined part

Abstract

This application belongs to the field of measuring device technology and discloses a device for measuring the symmetry accuracy of machined parts. It includes a testing box for placing the test piece, four sliding through holes arranged around the test piece at the top of the testing box, clamping blocks slidably disposed within the sliding through holes, a sliding seat slidably disposed on the testing box, an electro-hydraulic push rod fixed to the top of the sliding seat, and a ring frame fixed to the end of the push rod. Two testing rods are slidably disposed on the ring frame, one of which is equipped with an infrared distance sensor for detecting the distance between the two testing rods. The testing box is equipped with a displacement mechanism for driving the four clamping blocks to simultaneously move closer or further apart. An adjustment component is disposed on the ring frame, and a moving component is shared on both the testing box and the sliding seat. This application, through improvements to the existing technical structure, makes the device more convenient to use and improves the testing accuracy.

Description

Technical Field

[0001] This utility model relates to the field of measuring device technology, and in particular to a device for measuring the symmetry accuracy of machined parts. Background Technology

[0002] Symmetry is an indicator used in machining to limit the deviation of a measured line or surface from a reference straight line or plane. Its tolerance zone is the area between two symmetrically arranged parallel planes or straight lines.

[0003] Chinese utility model patent CN220489949U discloses a device for measuring the symmetry accuracy of machined parts. The device includes a main body, with sliding rods on both sides of the inner wall of the main body, connected to the inner wall via fixed blocks. A slider is mounted on the outer side of each sliding rod, and a measuring rod is mounted on one side of the slider, connected to the sliding rod via the slider. The measuring rod has a toothed assembly on its outer side. A protective shell is mounted on one side of the main body. The height of the threaded rod is adjusted inside the sleeve block, and the object to be measured is placed on the measuring seat directly below the fixed rod. Then, the threaded rod is turned. The threaded rod drives the fixed rod downward to fix the object being measured. Then, the height of the main body is adjusted according to the size of the object. The height of the main body is adjusted by the electric telescopic rod on one side of the base. After the adjustment is completed, the equipment is started. The motor drives the second gear on one side of the connecting rod to rotate through the transmission of the first gear and the chain. Because the measuring rod is engaged on one side of the second gear, the rotation of the second gear drives the measuring rod to extend or retract. At this time, the measuring rod drives the measuring needle to move closer to the material outside the fixed rod. When the measuring needle touches the material, the motor stops working and the measurement data is obtained. Touching the material indicates that the material is asymmetrical.

[0004] In the existing technology, in order to ensure the accuracy of product testing, the product testing surface needs to be manually adjusted to prevent tilting each time the product is tested, and the product must be placed in the same position on the measuring seat each time. This is not only cumbersome to use, but also reduces the testing accuracy of the device. Utility Model Content

[0005] To address the aforementioned problems, this utility model provides a device for measuring the symmetry accuracy of machined parts.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a symmetry accuracy measuring device for machined parts, comprising a testing box for placing the test piece, four sliding through holes arranged around the test piece at the top of the testing box, clamping blocks slidably disposed within the sliding through holes, a sliding seat slidably disposed on the testing box, an electro-hydraulic push rod fixed to the top of the sliding seat, an annular frame fixed to the push rod end of the electro-hydraulic push rod, two testing rods slidably disposed on the annular frame, one of the testing rods being provided with an infrared distance sensor for detecting the distance between the two testing rods, a displacement mechanism for driving the four clamping blocks to move closer or further apart simultaneously on the testing box, an adjustment component for adjusting the distance between the two testing rods on the annular frame, and a moving component for driving the sliding seat to move on both the testing box and the sliding seat.

[0007] By adopting the above technical solution, the workpiece is placed between four clamping blocks. The displacement mechanism drives the four clamping blocks closer together until the workpiece is clamped. Then, the electro-hydraulic push rod extends its end until the two detection rods move into the interior of the workpiece. The distance between the two detection rods is then adjusted by the drive adjustment component until the two detection rods are in contact with the inner wall of the workpiece. The distance between the two detection rods is detected by an infrared distance sensor. Similarly, the sliding seat is moved by the moving component. With the cooperation of the detection rods and the adjustment component, the distance between different points in the horizontal direction of the workpiece is detected. Multiple measurements are taken and the average value is calculated to calculate the symmetry deviation, thereby obtaining the symmetry of the workpiece. The workpiece is centered and clamped by the four clamping blocks moving closer simultaneously. There is no need for manual adjustment by the operator. It is more convenient to use. At the same time, the workpiece is detected at multiple points, which improves the detection accuracy of the device.

[0008] Furthermore, the displacement mechanism includes a worm gear that passes through and is rotatably connected to the displacement mechanism, a rotating column that is rotatably installed in the detection box, a turntable that is fixedly sleeved on the rotating column, a connecting column that is set on the clamping block, a worm wheel that is fixedly sleeved on the rotating column and meshes with the worm gear, and an adjusting knob that is fixed on the worm gear. The turntable has an adjusting through hole that slides with the connecting column. The adjusting through hole is eccentrically set with the turntable. The number of adjusting through holes, the number of connecting columns, and the number of clamping blocks are all equal and their positions correspond one-to-one.

[0009] By adopting the above technical solution, rotating the worm causes the worm wheel meshing with the worm, the rotating column fixed to the worm wheel, and the turntable fixed to the rotating column to all rotate. Due to the eccentric setting of the adjustment through hole and the turntable, the connecting column and the adjustment through hole slide together, so that the four connecting columns and the clamping blocks connected to the four connecting columns move closer or further away from each other, thereby achieving the purpose of clamping or releasing the product.

[0010] Furthermore, the moving component includes a pulley rotatably mounted on a sliding seat, a slide rail fixed to the detection box and cooperating with the pulley, a motor fixed to the sliding seat, a gear fixedly sleeved on the output end of the motor, and a rack fixed to the detection box and meshing with the gear.

[0011] By adopting the above technical solution, after the motor works, it drives the gear to rotate. Since the gear meshes with the rack, it drives the sliding seat connected to the motor and the slide rail connected to the sliding seat to move, thereby achieving the purpose of detecting multiple points of the product.

[0012] Furthermore, the adjustment assembly includes an annular slider slidably disposed on the annular frame, a bidirectional screw rod rotatably disposed through the annular frame and connected to it, and an auxiliary knob fixed on the bidirectional screw rod. The detection rod is slidably disposed on the annular slider. The number of annular sliders is equal to the number of detection rods and their positions correspond one-to-one. The bidirectional screw rod is provided with two threaded grooves with opposite directions of rotation and equal pitch. The two annular sliders are respectively threaded to the threaded grooves at both ends. The annular slider is provided with a reset assembly for connecting the annular slider and the detection rod.

[0013] By adopting the above technical solution, rotating the auxiliary knob drives the bidirectional screw to rotate. Since the bidirectional screw is provided with two sections of threaded grooves with opposite directions and equal pitch, the two annular sliders are respectively threaded to the threaded grooves at both ends. This causes the two annular sliders and the detection rods connected to the two annular sliders to move closer to or further away from each other, thereby adjusting the distance between the two detection rods to detect products with different inner or outer diameters.

[0014] Furthermore, the reset assembly includes a slide rod fixed inside the annular slider and a spring fixed between the slide rod and the inner wall of the annular slider. The detection rod is slidably engaged with the inner wall of the adjustment assembly. The slide rod passes through the detection rod and is slidably engaged. The number of reset assemblies is equal to the number of detection rods and their positions correspond one-to-one.

[0015] By adopting the above technical solution, the sliding rod and spring are designed to buffer the force during the contact process between the detection rod and the workpiece, thus playing a protective role.

[0016] Furthermore, the four clamping blocks are provided with grooves of a wave-shaped structure on their sidewalls that are close to each other.

[0017] By adopting the above technical solution, the friction force when the clamping block contacts the product is improved.

[0018] Furthermore, both the adjustment knob and the auxiliary knob are equipped with anti-slip strips.

[0019] By adopting the above technical solution and setting the anti-slip strip, the probability of slippage when rotating the adjustment knob and auxiliary knob is reduced.

[0020] In summary, the present invention has the following beneficial effects: In this application, by improving the existing technical structure, the device is made more convenient to use and the detection accuracy of the device is improved. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0022] Figure 2 This is a cross-sectional structural schematic diagram of an embodiment of the present utility model;

[0023] Figure 3 This is a cross-sectional schematic diagram of an embodiment of the present invention to highlight the internal structure of the sliding seat;

[0024] Figure 4 This is a cross-sectional schematic diagram of an embodiment of the present invention to highlight the internal structure of the ring frame;

[0025] Figure 5 yes Figure 4 Enlarged diagram of point A in the middle.

[0026] In the diagram: 1. Detection box; 2. Sliding through hole; 3. Clamping block; 4. Sliding seat; 5. Electro-hydraulic push rod; 6. Ring frame; 7. Detection rod; 8. Displacement mechanism; 81. Worm gear; 82. Rotating column; 83. Turntable; 84. Connecting column; 85. Worm wheel; 86. Adjusting knob; 9. Adjusting assembly; 91. Ring slider; 92. Bidirectional screw; 93. Auxiliary knob; 10. Adjusting through hole; 11. Moving assembly; 111. Pulley; 112. Slide rail; 113. Motor; 114. Gear; 115. Rack; 12. Reset assembly; 121. Slide rod; 122. Spring. Detailed Implementation

[0027] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0028] like Figure 1-5As shown in the figure, this application discloses a device for measuring the symmetry accuracy of machined parts, including a detection box 1, a displacement mechanism 8, a moving assembly 11, an adjusting assembly 9, and a reset assembly 12. The detection box 1 is used to place the test piece. Four sliding through holes 2 are provided through the top of the detection box 1, arranged around the test piece. Clamping blocks 3 are slidably disposed within the sliding through holes 2. A sliding seat 4 is slidably disposed on the detection box 1, and an electro-hydraulic push rod 5 is fixed to the top of the sliding seat 4. A ring frame 6 is fixed to the push rod end of the electro-hydraulic push rod 5. Two detection rods 7 are slidably disposed on the ring frame 6, and one of the detection rods 7 is equipped with an infrared distance sensor for detecting the distance between the two detection rods 7. The workpiece is placed between four clamping blocks 3. The displacement mechanism 8 drives the four clamping blocks 3 to move closer together until the workpiece is clamped. Then, the electro-hydraulic push rod 5 extends its end until the two detection rods 7 move into the interior of the workpiece. The distance between the two detection rods 7 is then adjusted by the drive adjustment component 9 until the two detection rods 7 are in contact with the inner wall of the workpiece. The distance between the two detection rods 7 is detected by the infrared distance sensor. Similarly, the sliding seat 4 is moved by the moving component 11. With the cooperation of the detection rods 7 and the adjustment component 9, the distance between different points in the horizontal direction of the workpiece is detected. The symmetry deviation is calculated by taking the average value of multiple measurements, thereby obtaining the symmetry of the workpiece. The workpiece is centered and clamped by the four clamping blocks 3 moving closer together at the same time. There is no need for manual adjustment by the operator. It is more convenient to use. At the same time, the workpiece is detected at multiple points, which improves the detection accuracy of the device.

[0029] A displacement mechanism 8 is mounted on the detection box 1. The displacement mechanism 8 drives four clamping blocks 3 to move closer or further apart simultaneously. The displacement mechanism 8 includes a worm gear 81, a rotating column 82, a turntable 83, a connecting column 84, a worm wheel 85, and an adjusting knob 86. The worm gear 81 is rotatably mounted on the displacement mechanism 8. The rotating column 82 is rotatably mounted inside the detection box 1, and the turntable 83 is fixedly mounted on the rotating column 82. An adjusting through hole 10 is provided on the turntable 83, which slides with the connecting column 84. The adjusting through hole 10 is eccentrically positioned with the turntable 83. The number of adjusting through holes 10, the number of connecting columns 84, and the number of clamping blocks 3 are all equal and their positions correspond one-to-one. The connecting column 84 is mounted on the clamping blocks 3. The worm wheel 85 is fixedly mounted on the rotating column 82 and meshes with the worm gear 81. The adjusting knob 86 is fixed to the worm gear 81. Rotating the worm gear 81 causes the worm wheel 85 meshing with the worm gear 81, the rotating column 82 fixed to the worm wheel 85, and the turntable 83 fixed to the rotating column 82 to all rotate. Since the adjusting through hole 10 and the turntable 83 are eccentrically set, the connecting column 84 slides with the adjusting through hole 10, so that the four connecting columns 84 and the clamping blocks 3 connected to the four connecting columns 84 move closer or further away from each other, thereby achieving the purpose of clamping or releasing the product.

[0030] A movable component 11 is mounted on both the inspection box 1 and the sliding seat 4, and is used to drive the sliding seat 4 to move. The movable component 11 includes pulleys 111, a slide rail 112, a motor 113, gears 114, and a rack 115. Four pulleys 111 are arranged around the sliding seat 4, and the sliding seat 4 is rotatably connected to the pulleys 111. The slide rail 112 is fixed to the inspection box 1 and engages with the pulleys 111. The motor 113 is fixed to the sliding seat 4. The gear 114 is fixedly mounted on the output end of the motor 113, and the rack 115 is fixed to the inspection box 1 and meshes with the gear 114. When the motor 113 operates, it drives the gear 114 to rotate. Because the gear 114 meshes with the rack 115, it drives the sliding seat 4 connected to the motor 113 and the slide rail 112 connected to the sliding seat 4 to move, thereby achieving the purpose of multi-point inspection of the product.

[0031] An adjusting assembly 9 is mounted on the annular frame 6 and is used to adjust the distance between the two detection rods 7. The adjusting assembly 9 includes annular sliders 91, a bidirectional screw 92, and an auxiliary knob 93. The annular slider 91 is slidably mounted on the annular frame 6. The detection rods 7 are slidably mounted on the annular sliders 91, and the number of annular sliders 91 is equal to the number of detection rods 7, with their positions corresponding one-to-one. The bidirectional screw 92 passes through the annular frame 6 and is rotatably connected. The bidirectional screw 92 has two threaded grooves with opposite directions of rotation and equal pitch. The two annular sliders 91 are threadedly connected to the threaded grooves at both ends, and the auxiliary knob 93 is fixed to the bidirectional screw 92. Rotating the auxiliary knob 93 drives the bidirectional screw 92 to rotate. Since the bidirectional screw 92 is provided with two threaded grooves with opposite directions and equal pitch, the two annular sliders 91 are respectively threaded to the threaded grooves at both ends. This causes the two annular sliders 91 and the detection rods 7 connected to the two annular sliders 91 to move closer or further away from each other, thereby adjusting the distance between the two detection rods 7 to detect products with different inner or outer diameters.

[0032] A reset assembly 12 is mounted on the annular slider 91 and connects the annular slider 91 to the detection rod 7. The reset assembly 12 includes a slide rod 121 and a spring 122. The slide rod 121 is fixed inside the annular slider 91. The spring 122 is fixed between the slide rod 121 and the inner wall of the annular slider 91. The detection rod 7 slides against the inner wall of the adjusting assembly 9. The slide rod 121 passes through the detection rod 7 and slides against it. The number of reset assemblies 12 is equal to the number of detection rods 7, and their positions correspond one-to-one. The slide rod 121 and spring 122 buffer the force during the contact between the detection rod 7 and the workpiece, providing a protective function.

[0033] The four clamping blocks 3 have wavy grooves on their sidewalls that are close to each other. This increases the friction between the clamping blocks 3 and the product.

[0034] Both the adjustment knob 86 and the auxiliary knob 93 are equipped with anti-slip strips. The anti-slip strips reduce the probability of slippage when rotating the adjustment knob 86 and the auxiliary knob 93.

[0035] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A device for measuring the symmetry accuracy of machined parts, comprising a testing box (1) for placing the test piece, characterized in that: The top of the detection box (1) is provided with four sliding through holes (2) arranged around the detection piece. Clamping blocks (3) are slidably arranged in the sliding through holes (2). A sliding seat (4) is slidably arranged on the detection box (1). An electric hydraulic push rod (5) is fixed on the top of the sliding seat (4). A ring frame (6) is fixed at the push rod end of the electric hydraulic push rod (5). Two detection rods (7) are slidably arranged on the ring frame (6). An infrared distance sensor for detecting the distance between the two detection rods (7) is provided on one of the detection rods (7). A displacement mechanism (8) for driving the four clamping blocks (3) to move closer or further away from each other is provided on the detection box (1). An adjustment component (9) for adjusting the distance between the two detection rods (7) is provided on the ring frame (6). A moving component (11) for driving the sliding seat (4) to move is provided on both the detection box (1) and the sliding seat (4).

2. The symmetry accuracy measuring device for machined parts according to claim 1, characterized in that: The displacement mechanism (8) includes a worm gear (81) that is rotatably connected to the displacement mechanism (8), a rotating column (82) that is rotatably installed in the detection box (1), a turntable (83) that is fixedly sleeved on the rotating column (82), a connecting column (84) that is set on the clamping block (3), a worm wheel (85) that is fixedly sleeved on the rotating column (82) and meshes with the worm gear (81), and an adjustment knob (86) that is fixedly sleeved on the worm gear (81). The turntable (83) is provided with an adjustment through hole (10) that slides with the connecting column (84). The adjustment through hole (10) is eccentrically set with the turntable (83). The number of adjustment through holes (10), the number of connecting columns (84), and the number of clamping blocks (3) are all equal and their positions correspond one-to-one.

3. The symmetry accuracy measuring device for machined parts according to claim 1, characterized in that: The moving component (11) includes a pulley (111) rotatably mounted on a sliding seat (4), a slide rail (112) fixed on the detection box (1) and cooperating with the pulley (111), a motor (113) fixed on the sliding seat (4), a gear (114) fixedly sleeved on the output end of the motor (113), and a rack (115) fixed on the detection box (1) and meshing with the gear (114).

4. The symmetry accuracy measuring device for machined parts according to claim 2, characterized in that: The adjustment assembly (9) includes an annular slider (91) slidably disposed on the annular frame (6), a bidirectional screw (92) rotatably disposed on the annular frame (6), and an auxiliary knob (93) fixed on the bidirectional screw (92). The detection rod (7) is slidably disposed on the annular slider (91). The number of annular sliders (91) is equal to the number of detection rods (7) and their positions correspond one-to-one. The bidirectional screw (92) is provided with two threaded grooves with opposite directions and equal pitch. The two annular sliders (91) are respectively threaded to the threaded grooves at both ends. The annular slider (91) is provided with a reset assembly (12) for connecting the annular slider (91) and the detection rod (7).

5. The symmetry accuracy measuring device for machined parts according to claim 4, characterized in that: The reset assembly (12) includes a slide rod (121) fixed inside the annular slider (91) and a spring (122) fixed between the slide rod (121) and the inner wall of the annular slider (91). The detection rod (7) slides in cooperation with the inner wall of the adjustment assembly (9). The slide rod (121) passes through the detection rod (7) and slides in cooperation. The number of sets of the reset assembly (12) is equal to the number of detection rods (7) and their positions correspond one-to-one.

6. The symmetry accuracy measuring device for machined parts according to claim 1, characterized in that: The four clamping blocks (3) are provided with grooves of a wave-shaped structure on their side walls that are close to each other.

7. The symmetry accuracy measuring device for machined parts according to claim 4, characterized in that: Both the adjustment knob (86) and the auxiliary knob (93) are equipped with anti-slip strips.

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