Aluminum alloy part measuring and positioning tool

Abstract

This utility model discloses a measuring and positioning fixture for aluminum alloy parts, comprising: a base, a clamping seat, a height adjustment mechanism, a height measuring mechanism, and a bidirectional width measuring mechanism. The clamping seat is fixed on the base and is adapted to clamp the workpiece to be measured. The height adjustment mechanism is mounted on the base and includes a lifting platform that moves along the height. The height measuring mechanism is slidably disposed on the base and includes a measuring head adapted to move along the height. The bidirectional width measuring mechanism is mounted on the lifting platform and includes two oppositely arranged measuring ends adapted to simultaneously contact opposite sides of the workpiece to be measured. The measuring head of the height measuring mechanism is connected to one of the measuring ends of the bidirectional width measuring mechanism. This utility model enables the clamping of aluminum alloy parts and the measurement of their width and height.

Description

Technical Field

[0001] This utility model relates to a measuring and positioning fixture for aluminum alloy parts. Background Technology

[0002] Currently, with the rapid development of modern manufacturing, aluminum alloy materials, due to their excellent properties such as light weight, high strength, and good corrosion resistance, are widely used in aerospace, automotive manufacturing, electronic equipment, and building decoration. The processing precision and quality control requirements for aluminum alloy parts are increasingly stringent, and the accuracy requirements for dimensional measurement and quality inspection are becoming more and more rigorous. The accuracy of tooling positioning directly affects the accuracy of measurement results, and thus the final quality of the product.

[0003] After searching the existing technology, it was found that Chinese patent CN221364510U discloses a general measuring fixture for aluminum alloy automotive parts. The patent uses a fixed expansion sleeve and a sliding expansion sleeve to achieve the positioning and fixation of the workpiece. However, it was found in use that the fixture is only suitable for workpieces with standard machined holes. It lacks effective clamping and positioning capabilities for aluminum alloy parts with complex shapes, no standard holes, or irregular hole distribution, and it lacks measurement and adjustment functions, making it difficult to meet the measurement needs of complex workpieces. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide a measuring and positioning fixture for aluminum alloy parts, which can realize the clamping of aluminum alloy parts and the measurement of their width and height.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is: a measuring and positioning fixture for aluminum alloy parts, comprising:

[0006] Base;

[0007] A clamping seat, which is fixed on the base, is adapted to clamp the workpiece to be tested;

[0008] A height adjustment mechanism is mounted on the base, and the height adjustment mechanism is provided with a lifting platform that moves along the height.

[0009] A height measuring mechanism, which is slidably mounted on the base, and is provided with a measuring head suitable for moving along the height;

[0010] A bidirectional width measuring mechanism is installed on the lifting platform. The bidirectional width measuring mechanism has two measuring ends arranged opposite to each other, and the two measuring ends are adapted to simultaneously contact the opposite sides of the workpiece to be measured.

[0011] The measuring head of the height measuring mechanism is connected to one of the measuring ends of the bidirectional width measuring mechanism, and the measuring head is adapted to abut against the workpiece from above when the workpiece is placed on the clamping seat.

[0012] Furthermore, the clamping seat includes:

[0013] The chassis is mounted on a base and has four first arc-shaped grooves spaced at circumferential centers.

[0014] A turntable is rotatably mounted on the chassis, and the turntable is provided with four second arc-shaped grooves that are spaced apart at the center of the circumference, corresponding to the first arc-shaped groove.

[0015] A clamping rod, which slides through the first and second arc-shaped waist grooves;

[0016] The first and second arc-shaped waist grooves have opposite arc shapes, and the turntable is adapted to drive the clamping rod to slide along the path of the first arc-shaped waist groove through the second arc-shaped waist groove when it is rotated.

[0017] Furthermore, in order to reduce scratches during clamping, the aluminum alloy part measuring and positioning fixture also includes an elastic abutment sleeve, which is sleeved on the upper end of the clamping rod and is adapted to abut against the workpiece to be measured.

[0018] Furthermore, a specific structure of a rotary locking mechanism is provided, wherein the clamping base is further provided with a rotary locking mechanism, the rotary locking mechanism comprising:

[0019] A locking ring, which is fixed to the outer periphery of the chassis;

[0020] At least one locking screw is threaded onto the locking ring, and the locking screw is adapted to be rotated to abut against the turntable to lock the rotational position of the turntable.

[0021] Furthermore, the height adjustment mechanism includes:

[0022] At least one guide rod, which is vertically fixed to the base;

[0023] The fixing seat is fixed to the upper end of the guide rod;

[0024] A lifting screw, which is rotatably mounted between the base and the fixed seat;

[0025] The lifting platform is provided with at least one guide hole and a threaded hole. The guide hole is sleeved on the corresponding guide rod, and the threaded hole is threadedly connected to the lifting screw. The lifting platform is adapted to be driven to rise and fall along the guide rod by rotating the lifting screw.

[0026] Furthermore, the height adjustment mechanism also includes:

[0027] A height-rotating handle is fixed to the top of the lifting screw, and the height-rotating handle is adapted to drive the lifting screw to rotate so as to drive the lifting platform to rise and fall.

[0028] Furthermore, the bidirectional width measuring mechanism includes:

[0029] A bidirectional screw, which is horizontally arranged on the lifting platform and has a left-hand section and a right-hand section with opposite threads;

[0030] Guide rail, which is mounted on the lifting platform;

[0031] A pair of measuring seats, which are respectively threaded onto the left-hand and right-hand sections of the bidirectional screw, and the pair of measuring seats are slidably mounted on the guide rail;

[0032] A drive source is fixed on the lifting platform and is connected to one end of the bidirectional screw. The drive source is adapted to drive the bidirectional screw to rotate.

[0033] A width ruler, which is fixed on the lifting platform;

[0034] The measuring ends are respectively disposed on the pair of measuring seats, and the measuring seats are provided with scale indicators pointing to the width ruler. When the drive source is rotated, the pair of measuring seats are adapted to move synchronously toward or away from the center under the drive of the bidirectional screw.

[0035] Furthermore, the base is provided with a guide groove;

[0036] The height measuring mechanism includes:

[0037] A base, which is slidably disposed within a guide groove;

[0038] A digital caliper, wherein the digital caliper has a fixed caliper body and a sliding caliper block slidably disposed on the fixed caliper body, and the fixed caliper body is fixed on a base;

[0039] The measuring head is mounted on the sliding ruler, and the sliding ruler is connected to one of the measuring ends of the bidirectional width measuring mechanism.

[0040] By adopting the above technical solution, this utility model has the following beneficial effects:

[0041] In this invention, the workpiece to be measured is placed on the clamping base, which clamps and fixes the workpiece. The height adjustment mechanism moves the lifting platform to a suitable position along the height direction. Then, the bidirectional width measuring mechanism is activated, causing its two measuring ends to simultaneously contact the opposite sides of the workpiece to measure the width. Simultaneously, the measuring head of the height measuring mechanism comes into contact with the workpiece from above to measure the height. This achieves synchronous and linked measurement of height and width, improving measurement efficiency and achieving the effect of quickly and accurately measuring the dimensions of aluminum alloy parts.

[0042] Furthermore, the clamping base adopts a combination structure of chassis, turntable, and clamping rod. The first and second arc-shaped grooves work together to allow the clamping rod to slide along an arc-shaped path when the turntable rotates, achieving adaptive clamping of workpieces of different sizes. The elastic abutment sleeve prevents scratches caused by direct contact between the clamping rod and the workpiece, protecting the workpiece surface quality. The rotation locking mechanism, through the cooperation of the locking ring and locking screw, reliably locks the rotation position of the turntable, ensuring the stability of the clamping state. The height adjustment mechanism uses a combination of guide rod, lifting screw, and height rotation handle, achieving precise height adjustment of the lifting platform, with simple operation and accurate positioning. The bidirectional width measurement mechanism uses a left-hand and right-hand section design of a bidirectional screw, combined with a drive source and width ruler, allowing a pair of measuring seats to synchronously move towards or away from the center, achieving bidirectional synchronous measurement and improving measurement efficiency and accuracy. The height measurement mechanism uses a digital caliper structure, with the fixed ruler and sliding block working together to achieve precise digital height measurement.

[0043] In summary, this utility model achieves rapid positioning, stable clamping, and measurement of aluminum alloy parts. It has significant advantages such as reasonable structure, simple operation, and strong versatility. It can effectively solve the problem of difficult measurement and positioning of aluminum alloy parts in the prior art, and improve the efficiency and quality of measurement work. Attached Figure Description

[0044] Figure 1 This is a three-dimensional structural diagram of the aluminum alloy part measuring and positioning fixture of this utility model. Figure 1 ;

[0045] Figure 2 This is a three-dimensional structural diagram of the aluminum alloy part measuring and positioning fixture of this utility model. Figure 2 ;

[0046] Figure 3 This is a three-dimensional structural diagram of the aluminum alloy part measuring and positioning fixture of this utility model. Figure 3 ;

[0047] Figure 4 for Figure 3 A magnified view of part A in the middle;

[0048] Figure 5 for Figure 2 A magnified view of part B in the middle section. Detailed Implementation

[0049] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0050] like Figure 1-5 As shown, a measuring and positioning fixture for aluminum alloy parts includes:

[0051] Base 1;

[0052] Clamping seat 2, which is fixed on base 1, is suitable for clamping the workpiece to be measured;

[0053] Height adjustment mechanism 3 is mounted on base 1 and includes a lifting platform 31 that moves along the height.

[0054] Height measuring mechanism 4 is slidably mounted on base 1 and is provided with measuring head 41 suitable for moving along the height.

[0055] A bidirectional width measuring mechanism is installed on a lifting platform 31. The bidirectional width measuring mechanism has two measuring ends that are arranged opposite to each other. The two measuring ends are suitable for simultaneously contacting the opposite sides of the workpiece to be measured.

[0056] The measuring head 41 of the height measuring mechanism 4 is connected to one of the measuring ends of the width bidirectional measuring mechanism. The measuring head 41 is adapted to reach the workpiece from above when the workpiece to be measured is placed on the clamping seat 2.

[0057] In this embodiment, as Figure 1 As shown, in use, the workpiece to be measured is placed on the clamping seat 2, which clamps and fixes the workpiece. The height adjustment mechanism 3 is operated to move the lifting platform 31 to a suitable position along the height direction. Then, the bidirectional width measuring mechanism is activated, so that its two measuring ends simultaneously contact the opposite sides of the workpiece to be measured for width measurement. At the same time, the measuring head 41 of the height measuring mechanism 4 comes into contact with the workpiece from above to measure the height. This achieves synchronous linkage measurement of height and width, improves measurement efficiency, and achieves the effect of quickly and accurately measuring the dimensions of aluminum alloy parts.

[0058] Specifically, such as Figure 1 and Figure 4 As shown, the clamping base 2 includes:

[0059] Chassis 21 is mounted on base 1 and has four first arc-shaped waist grooves 211 arranged at circumferential center intervals on chassis 21.

[0060] Turntable 22 is rotatably mounted on chassis 21. Turntable 22 is provided with four second arc-shaped waist grooves 221 that correspond to the first arc-shaped waist groove 211 and are spaced apart at the center of the circumference.

[0061] The clamping rod 23 slides through the first arc-shaped waist groove 211 and the second arc-shaped waist groove 221;

[0062] The first arc-shaped waist groove 211 and the second arc-shaped waist groove 221 have opposite arc shapes. The turntable 22 is adapted to drive the clamping rod 23 to slide along the path of the first arc-shaped waist groove 211 through the second arc-shaped waist groove 221 when it is rotated.

[0063] Specifically, such as Figure 4 As shown, the aluminum alloy part measuring and positioning fixture also includes an elastic abutment sleeve 24, which is sleeved on the upper end of the clamping rod 23 and is adapted to abut against the workpiece to be measured.

[0064] In this embodiment, as Figure 1 and Figure 4 As shown, the clamping rod 23 of the clamping seat 2 moves during the rotation of the turntable 22 through the cooperation of the first arc-shaped groove 211 and the second arc-shaped groove 221. When the operator rotates the turntable 22, the second arc-shaped groove 221 on the turntable 22 generates an angular displacement relative to the first arc-shaped groove 211 fixed on the base 21. Since the arc directions of the first arc-shaped groove 211 and the second arc-shaped groove 221 are opposite, the clamping rod 23 moves radially inward or outward under the constraint of the two arc-shaped grooves, thereby realizing the clamping and adjustment of workpieces of different sizes.

[0065] The elastic abutment sleeve 24 is disposed at the upper end of the clamping rod 23, and the elastic abutment sleeve 24 is made of elastic materials such as rubber or polyurethane. When the clamping rod 23 moves inward and contacts the workpiece to be measured, the elastic abutment sleeve 24 can adapt to the slight unevenness of the surface of the workpiece to be measured, and at the same time provide a buffering effect to avoid the clamping rod 23 directly contacting the workpiece to be measured, which would cause surface damage or positioning error.

[0066] In some embodiments, the number of the first arc-shaped waist groove 211 and the second arc-shaped waist groove 221 is not limited to four, and can be set to three or six depending on the clamping stability requirements. In other embodiments, the elastic abutment sleeve 24 can also be made of silicone or other polymer materials with elastic properties.

[0067] Specifically, such as Figure 1 and Figure 4-5 As shown, the clamping base 2 is also provided with a rotary locking mechanism, which includes:

[0068] Locking ring 251 is fixed to the outer periphery of chassis 21;

[0069] Three locking screws 252 are threaded onto a locking ring 251. The locking screws 252 are adapted to be rotated to abut against a turntable 22 to lock the rotational position of the turntable 22.

[0070] In this embodiment, as Figure 1 and Figure 4-5 As shown, the rotary locking mechanism locks the rotational position of the turntable 22 by the radial movement of the locking screw 252. When the operator rotates the locking screw 252 clockwise, the locking screw 252 moves inward along the thread and abuts against the outer circumferential surface of the turntable 22, generating friction to prevent the turntable 22 from continuing to rotate, thereby fixing the radial position of the clamping rod 23 in the current state. When it is necessary to readjust the clamping position, the locking screw 252 is rotated counterclockwise to disengage it from the turntable 22, and the turntable 22 returns to its rotatable state.

[0071] In some embodiments, the number of locking screws 252 is not limited to three, and can be set to one or two according to the locking stability requirements. Multiple locking screws 252 are evenly distributed along the circumferential direction of the locking ring 251.

[0072] Specifically, such as Figure 1-2 As shown, the height adjustment mechanism 3 includes:

[0073] Two guide rods 32 are vertically fixed on the base 1;

[0074] Fixing seat 33 is fixed to the upper end of guide rod 32;

[0075] The lifting screw 34 is rotatably installed between the base 1 and the fixed base 33;

[0076] The lifting platform 31 is provided with two guide holes and a threaded hole. The guide holes are sleeved on the corresponding guide rods 32, and the threaded holes are threadedly connected to the lifting screw 34. The lifting platform 31 is suitable for being driven to rise and fall along the guide rods 32 by rotating the lifting screw 34.

[0077] Specifically, such as Figure 1-2 As shown, the height adjustment mechanism 3 also includes:

[0078] A height-rotating handle 35 is fixed to the top of the lifting screw 34. The height-rotating handle 35 is adapted to drive the lifting screw 34 to rotate so as to drive the lifting platform 31 to rise and fall.

[0079] In this embodiment, as Figure 1-2As shown, the height adjustment mechanism 3 achieves vertical position adjustment of the lifting platform 31 through a threaded connection between the lifting screw 34 and the lifting platform 31. When the operator rotates the height rotation handle 35, the lifting screw 34 rotates under the bearing support between the fixed seat 33 and the base 1. Due to the threaded engagement between the lifting screw 34 and the threaded hole of the lifting platform 31, the lifting platform 31 rises or falls along the axial direction of the lifting screw 34. The guide rod 32 passes through the guide hole of the lifting platform 31, restricting the lifting platform 31 to move only in the vertical direction without rotation, ensuring that the bidirectional width measuring mechanism installed on the lifting platform 31 remains horizontal.

[0080] In some embodiments, the number of guide rods 32 is not limited to two, and can be set to one or three depending on the size of the lifting platform 31 and the load-bearing requirements.

[0081] Specifically, such as Figure 1-2 As shown, the bidirectional width measuring mechanism includes:

[0082] A bidirectional screw 51 is horizontally mounted on the lifting platform 31 and has a left-hand section and a right-hand section with opposite threads;

[0083] Guide rail 52 is mounted on lifting platform 31;

[0084] A pair of measuring seats 53 are threadedly connected to the left-hand and right-hand sections of the bidirectional screw 51, respectively, and the pair of measuring seats 53 are slidably mounted on the guide rail 52;

[0085] The drive source 54 is fixed on the lifting platform 31 and is connected to one end of the bidirectional screw 51. The drive source 54 is suitable for driving the bidirectional screw 51 to rotate.

[0086] Width ruler 55, width ruler 55 is fixed on lifting platform 31;

[0087] The measuring ends are respectively set on a pair of measuring seats 53. The measuring seats 53 are provided with scale indicators pointing to the width ruler 55. When the drive source 54 is rotated, the pair of measuring seats 53 are adapted to move synchronously toward or away from the center under the drive of the bidirectional screw 51.

[0088] In this embodiment, as Figure 1-2 As shown, the bidirectional width measuring mechanism achieves synchronous, opposite-facing or opposite-facing movement of two measuring seats 53 through the left-hand and right-hand sections of the bidirectional screw 51. When the drive source 54 drives the bidirectional screw 51 to rotate, because the left-hand and right-hand sections have opposite thread directions, the two measuring seats 53 simultaneously move towards or away from the center position of the bidirectional screw 51 under the action of the thread force, thereby achieving clamping of the width dimension of the workpiece to be measured. The guide rail 52 constrains the movement direction of the measuring seats 53, ensuring that the measuring seats 53 move only in the horizontal direction without deflection.

[0089] The scale indicator block is fixed on the measuring base 53 and points to the scale mark on the width ruler 55. When the measuring base 53 moves, the operator reads the distance value between the two measuring ends by observing the position of the scale indicator block on the width ruler 55. In this embodiment, the drive source 54 is a stepper motor. The stepper motor is controlled by the motor drive circuit and outputs rotational motion to the bidirectional screw 51, which can be manually controlled to start and stop.

[0090] In some embodiments, the drive source 54 may also be a servo motor, a DC motor, or other device capable of outputting rotational motion, such as a hand crank. In other embodiments, the width ruler 55 may also be an electronic measuring device such as a digital ruler or an encoder instead of a mechanical scale.

[0091] Specifically, such as Figure 1-2 As shown, the base 1 is provided with a guide groove 11;

[0092] The height measuring mechanism 4 includes:

[0093] Base 42, which is slidably disposed within guide groove 11;

[0094] The digital caliper has a fixed ruler body 431 and a sliding ruler block 432 that is slidably disposed on the fixed ruler body 431. The fixed ruler body 431 is fixed on the base 42.

[0095] The measuring head 41 is mounted on the sliding ruler 432, which is connected to one of the measuring ends of the bidirectional width measuring mechanism.

[0096] In this embodiment, as Figure 1-2 As shown, the height measuring mechanism 4 achieves horizontal movement of the entire digital caliper along the surface of the base 1 by sliding the base 42 within the guide groove 11. When the base 42 moves along the guide groove 11, the digital caliper fixed on the base 42 moves accordingly, allowing the measuring head 41 to be adjusted to a suitable position above the workpiece to be measured. The sliding ruler block 432 is rigidly connected to one of the measuring seats 53 of the width bidirectional measuring mechanism via a connector. When the measuring seat 53 of the width bidirectional measuring mechanism moves towards the center and contacts the workpiece to be measured, the sliding ruler block 432 is synchronously pulled and moves along the fixed ruler body 431.

[0097] The measuring head 41 is fixed on the sliding ruler 432. When the sliding ruler 432 descends until the measuring head 41 contacts the upper surface of the workpiece to be measured, the digital caliper display shows the displacement distance of the sliding ruler 432 relative to the fixed ruler body 431. This distance reflects the height dimension of the workpiece to be measured. In this embodiment, the digital caliper uses a grating displacement sensor to realize the digital display of the displacement, and the displayed height is the difference between the height of the bottom surface of the clamping base 2 and the height of the displacement.

[0098] In other embodiments, the digital caliper can be replaced by other linear displacement measuring devices such as mechanical vernier calipers or dial indicators.

[0099] In this embodiment, the workpiece is first placed and clamped. The operator places the aluminum alloy workpiece to be tested in the center of the clamping base 2. Then, the turntable 22 of the clamping base 2 is rotated, and the second arc-shaped groove 221 on it is opposite in shape to the first arc-shaped groove 211 on the base 21, driving multiple clamping rods 23 to slide synchronously inward or outward radially. After the elastic abutment sleeve 24 at the upper end of the clamping rod 23 abuts against the surface of the workpiece to be tested and provides a stable clamping force, the locking screw 252 on the locking ring 251 is tightened, so that it abuts against the outer edge of the turntable 22, thereby reliably locking the clamping state.

[0100] Next, the measurement positioning and adjustment are performed. Based on the workpiece's measurement position requirements, the height adjustment mechanism 3's top height rotation handle 35 is rotated, which drives the lifting screw 34 to rotate. Since the lifting platform 31 is threadedly connected to the lifting screw 34 and guided by the guide rod 32, the lifting platform 31 will smoothly rise or fall vertically, thereby adjusting the entire width bidirectional measuring mechanism 5 mounted on it to a suitable measurement height.

[0101] Finally, the drive source 54 fixed on the lifting platform 31 is activated, driving the bidirectional screw 51 to rotate. Since the bidirectional screw 51 has left-hand and right-hand threaded sections, a pair of measuring seats 53 move synchronously towards each other until their measuring ends simultaneously contact the opposite sides of the workpiece. As the measuring seats 53 move towards each other, the sliding scale block 432 connected to one of the measuring seats 53 is synchronously driven, and the measuring head 41 mounted on the sliding scale block 432 descends until it abuts against the upper surface of the workpiece from above. At this point, the width value of the workpiece can be read on the width scale 55 via the scale indicator block 531 on the measuring seat 53, while the height value of the workpiece is directly displayed digitally on the display screen of the digital caliper. This completes the rapid, synchronous, and accurate measurement of the width and height of the aluminum alloy part in one operation.

[0102] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A measuring and positioning fixture for aluminum alloy parts, characterized in that, include: Base (1); Clamping seat (2), the clamping seat (2) is fixed on the base (1), and the clamping seat (2) is suitable for clamping the workpiece to be tested; Height adjustment mechanism (3), the height adjustment mechanism (3) is installed on the base (1), the height adjustment mechanism (3) is provided with a lifting platform (31) that moves along the height. A height measuring mechanism (4) is slidably disposed on the base (1), and the height measuring mechanism (4) is provided with a measuring head (41) suitable for moving along the height. A bidirectional width measuring mechanism is installed on the lifting platform (31). The bidirectional width measuring mechanism has two measuring ends arranged opposite to each other. The two measuring ends are adapted to simultaneously contact the opposite sides of the workpiece to be measured. The measuring head (41) of the height measuring mechanism (4) is connected to one of the measuring ends of the width bidirectional measuring mechanism. The measuring head (41) is adapted to abut against the workpiece from above when the workpiece is placed on the clamping seat (2).

2. The aluminum alloy part measuring and positioning fixture according to claim 1, characterized in that: The clamping seat (2) includes: The chassis (21) is mounted on the base (1) and the chassis (21) is provided with four first arc-shaped waist grooves (211) spaced apart at the center of the circumference. Turntable (22), which is rotatably mounted on the chassis (21), and the turntable (22) is provided with four second arc-shaped waist grooves (221) that are spaced apart at the center of the circumference, corresponding to the first arc-shaped waist groove (211). Clamping rod (23), which slides through the first arc-shaped waist groove (211) and the second arc-shaped waist groove (221); The first arc-shaped waist groove (211) and the second arc-shaped waist groove (221) are opposite in shape. The turntable (22) is adapted to drive the clamping rod (23) to slide along the path of the first arc-shaped waist groove (211) through the second arc-shaped waist groove (221) when it is rotated.

3. The aluminum alloy part measuring and positioning fixture according to claim 2, characterized in that: It also includes an elastic abutment sleeve (24), which is sleeved on the upper end of the clamping rod (23) and is adapted to abut against the workpiece to be tested.

4. The aluminum alloy part measuring and positioning fixture according to claim 2, characterized in that: The clamping base (2) is further provided with a rotation locking mechanism, the rotation locking mechanism comprising: A locking ring (251) is fixed to the outer periphery of the chassis (21); At least one locking screw (252) is threaded onto the locking ring (251) and is adapted to be rotated to abut against the turntable (22) to lock the rotational position of the turntable (22).

5. The aluminum alloy part measuring and positioning fixture according to claim 1, characterized in that: The height adjustment mechanism (3) includes: At least one guide rod (32) is vertically fixed to the base (1); A fixing seat (33) is fixed to the upper end of the guide rod (32); A lifting screw (34) is rotatably mounted between the base (1) and the fixed seat (33); The lifting platform (31) is provided with at least one guide hole and a threaded hole. The guide hole is sleeved on the corresponding guide rod (32), and the threaded hole is threadedly connected to the lifting screw (34). The lifting platform (31) is adapted to be driven to rise and fall along the guide rod (32) by the rotation of the lifting screw (34).

6. The aluminum alloy part measuring and positioning fixture according to claim 5, characterized in that: The height adjustment mechanism (3) further includes: A height-rotating handle (35) is fixed to the top of the lifting screw (34) and is adapted to drive the lifting screw (34) to rotate so as to drive the lifting platform (31) to rise and fall.

7. The aluminum alloy part measuring and positioning fixture according to claim 1, characterized in that: The bidirectional width measuring mechanism includes: A bidirectional screw (51) is horizontally arranged on the lifting platform (31) and has a left-hand section and a right-hand section with opposite threads; Guide rail (52), the guide rail (52) is disposed on the lifting platform (31); A pair of measuring seats (53) are threadedly connected to the left-hand and right-hand sections of the bidirectional screw (51) respectively, and the pair of measuring seats (53) are slidably disposed on the guide rail (52); A drive source (54) is fixed on the lifting platform (31) and is connected to one end of the bidirectional screw (51). The drive source (54) is adapted to drive the bidirectional screw (51) to rotate. Width ruler (55), the width ruler (55) is fixed on the lifting platform (31); The measuring ends are respectively set on the pair of measuring seats (53). The measuring seats (53) are provided with scale indicator blocks pointing to the width ruler (55). When the drive source (54) is rotated, the pair of measuring seats (53) are adapted to move synchronously toward or away from the center under the drive of the bidirectional screw (51).

8. The aluminum alloy part measuring and positioning fixture according to claim 1, characterized in that: The base (1) is provided with a guide groove (11); The height measuring mechanism (4) includes: The base (42) is slidably disposed in the guide groove (11); A digital caliper, wherein the digital caliper is provided with a fixed caliper body (431) and a sliding caliper block (432) slidably disposed on the fixed caliper body (431), and the fixed caliper body (431) is fixed on a base (42); The measuring head (41) is mounted on the sliding ruler (432), and the sliding ruler (432) is connected to one of the measuring ends of the bidirectional width measuring mechanism.

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