Aluminum alloy door and window size detection device

The modularly designed aluminum alloy door and window size detection device solves the problems of low accuracy and efficiency of traditional measuring devices, and enables quick replacement of measuring instruments and position adjustment, thereby improving the accuracy and efficiency of measurement.

CN223882947UActive Publication Date: 2026-02-06GUANGDONG HUIHUA DOORS WINDOWS & CURTAIN WALL CO LTD
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Patent Information

Application Number
CN202520405448.5
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-03-07
Publication Date
2026-02-06
Estimated Expiration
2035-03-07

AI Technical Summary

Technical Problem

Traditional aluminum alloy door and window measuring devices suffer from low accuracy and efficiency. In particular, handheld measuring tools are prone to reading errors, while fixed devices are cumbersome to change measuring instruments, which affects efficiency.

Method used

An aluminum alloy door and window size detection device was designed, which adopts a detachable modular structure, including a base, sliding rod, clamping part and measuring tool. The measuring tool can be quickly replaced and its position adjusted by threaded pin. Combined with a loading plate and display panel, the measurement accuracy and efficiency are improved.

Benefits of technology

It achieves accuracy and consistency in measurement results, simplifies the operation process, improves measurement efficiency, and expands the flexibility and versatility of the device.

✦ Generated by Eureka AI based on patent content.

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Abstract

An aluminum alloy door and window size detection device is used for measuring the thickness of an aluminum alloy door and window, and comprises a base, a sliding rod fixedly connected to the base; a first threaded pin integrally penetrates through the clamping part, the clamping part is fixed to the sliding rod through the first threaded pin, a fixing part is integrally formed on the clamping part, and the fixing part is located on the side, away from the sliding rod, of the clamping part; a second threaded pin integrally penetrates through the measuring tool, and the second threaded pin is used for fixing the measuring tool in the fixing part; when the first threaded pin is unscrewed, the clamping part slides in the extending direction of the sliding rod, and the second threaded pin is unscrewed, so that the measuring tool is disassembled.
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Description

TECHNICAL FIELD

[0001] The utility model relates to alloy measuring instrument field especially relates to a size detection device for aluminium alloy door and window. BACKGROUND

[0002] In aluminium alloy door and window manufacturing industry, accurate measurement of the size of each part of door and window is the key step to ensure product quality and meet customer installation demand. However, the traditional size measuring device exposes many drawbacks in practical application, which limits the improvement of production efficiency and product precision.

[0003] At present, the traditional door and window size measurement mode adopts vernier caliper to measure, and the vernier caliper is handheld, which is very convenient when measuring size, but due to the handheld measurement mode, there is the problem of reading too small when clamping or reading too large when holding too loose, which is difficult to guarantee the accuracy and consistency of measurement results and reduces the reliability of measurement. In addition to vernier caliper, the traditional size measuring device also has some fixed measuring devices, and compared with handheld size measuring device, the measuring result of the device is more accurate, but when measuring the thickness of different parts of door and window, different measuring tools may be needed, and the measuring tools on the general fixed device are not allowed to be easily replaced, so it is usually necessary to replace the measuring tool or replace the measuring device, which seriously affects the measurement efficiency.

[0004] Therefore, it is necessary to provide an aluminium alloy door and window size detection device capable of improving measurement accuracy and effectively improving measurement efficiency. SUMMARY

[0005] The utility model aims at providing an aluminium alloy door and window size detection device capable of improving measurement accuracy and effectively improving measurement efficiency.

[0006] According to an aspect of the present application, an aluminium alloy door and window size detection device is provided for measuring the thickness of aluminium alloy door and window, which comprises:

[0007] a base,

[0008] a sliding rod fixedly connected to the base;

[0009] a clamping part integrally penetrated by a first threaded pin, the first threaded pin fixing the clamping part to the sliding rod, the clamping part integrally formed with a fixing part on the side away from the sliding rod;

[0010] a measuring tool integrally penetrated by a second threaded pin, the second threaded pin fixing the measuring tool in the fixing part;

[0011] Wherein, the first threaded pin is unscrewed, the clamping part slides along the sliding rod extension direction, the second threaded pin is unscrewed, and the gauge is disassembled.

[0012] More preferably, the device further comprises:

[0013] The carrier plate is fixedly connected to the base, and the carrier plate is located between the base and the gauge in the direction parallel to the carrier plate surface.

[0014] More preferably, the gauge comprises:

[0015] The abutting piece is fixedly connected to the gauge and located on the side of the abutting piece close to the carrier plate.

[0016] The display panel is fixedly connected to the gauge and electrically connected to the sliding rod, and located on the side of the abutting piece away from the carrier plate.

[0017] More preferably, the first threaded pin is unscrewed, the clamping part drives the gauge to slide along the sliding rod extension direction, and the abutting piece also moves along the sliding rod extension direction.

[0018] More preferably, a plurality of grooves are integrally formed on the carrier plate, and the grooves are parallel to each other.

[0019] More preferably, when measuring the thickness of the aluminum alloy door and window, the aluminum alloy door and window is fixedly placed on the carrier plate, and the display panel displays the thickness of the aluminum alloy door and window when the abutting piece abuts against the aluminum alloy door and window.

[0020] More preferably, the first threaded pin is located on the side of the sliding rod away from the gauge.

[0021] More preferably, the second threaded pin is located on the side of the clamping part away from the gauge.

[0022] More preferably, the material of the abutting piece is formed by one or more combinations of stainless steel, aluminum alloy, rubber, nylon, carbon fiber composite material and glass steel.

[0023] The utility model has the following beneficial effects:

[0024] By unscrewing the first threaded pin, the clamping part slides along the sliding rod extension direction, so that the gauge abuts against the aluminum alloy door and window, and the measurement accuracy is improved. And by unscrewing the second threaded pin, the gauge is disassembled, so that the gauge can be quickly disassembled, effectively improving the measurement efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments or prior art description. Obviously, the drawings in the following description only relate to some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative effort.

[0026] Figure 1 A perspective view of the device in an embodiment of the present application;

[0027] Figure 2 A plan view of the device in an embodiment of the present application;

[0028] Figure 3 An exploded view of the device in an embodiment of the present application, including the gauge, the second threaded pin, the clamping portion and the second threaded pin;

[0029] BRIEF DESCRIPTION OF DRAWINGS 100, device; 10, base; 20, sliding rod; 30, clamping portion; 31, first threaded pin; 40, gauge; 41, second threaded pin; 42, abutting member; 43, display panel; 50, object carrier plate; 51, groove. DETAILED DESCRIPTION

[0030] In order to facilitate the understanding of the present application, the following will make a more comprehensive description of the present application with reference to the relevant drawings. The drawings show the preferred embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0031] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0033] Reference should be made to Figure 1 -Figure 3 The embodiment of the present application provides an aluminum alloy door and window size detection device 100 for measuring the thickness of an aluminum alloy door and window, the device 100 comprising a base 10, a sliding rod 20, a clamping part 30 and a gauge 40.

[0034] The sliding rod 20 is fixedly connected to the base 10. The clamping part 30 is integrally penetrated by a first threaded pin 31, the first threaded pin 31 fixes the clamping part 30 to the sliding rod 20, and the clamping part 30 is integrally formed with a fixing part on the side away from the sliding rod 20. The gauge 40 is integrally penetrated by a second threaded pin 41, and the second threaded pin 41 fixes the gauge 40 in the fixing part. The first threaded pin 31 is unscrewed, the clamping part 30 slides along the extension direction of the sliding rod 20, and the second threaded pin 41 is unscrewed to disassemble the gauge 40.

[0035] The base 10 serves as the support structure of the entire device 100, providing a stable foundation. The sliding rod 20 is fixedly connected to the base 10, forming a track that can move along its length direction. This design allows the clamping part 30 and the gauge 40 to move freely along the sliding rod 20, thereby adapting to the measurement needs of aluminum alloy doors and windows of different sizes. The clamping part 30 is fixed to the sliding rod 20 by the first threaded pin 31, and the clamping part 30 is integrally formed with a fixing part. This design allows the clamping part 30 to be adjusted in position by unscrewing the first threaded pin 31 when needed, while the fixing part is used to install and fix the gauge 40. The modular design allows individual components to be replaced or maintained independently, improving the flexibility and durability of the entire device 100. The gauge 40 is fixed in the fixing part of the clamping part 30 by the second threaded pin 41. This detachable design allows users to replace different types of gauges 40 as needed to adapt to different measurement tasks or precision requirements. For example, for occasions that require high-precision measurement, a higher-precision gauge 40 can be replaced; for occasions that require measurement of doors and windows made of different materials, a gauge 40 that is more suitable for the material can be replaced. After unscrewing the first threaded pin 31, the clamping part 30 can freely slide along the sliding rod 20, allowing users to adjust the position of the gauge 40 according to the actual size of the aluminum alloy door and window. This design not only improves the flexibility of measurement, but also helps to ensure the accuracy of measurement. At the same time, the detachable gauge 40 also facilitates regular calibration and maintenance, ensuring the stability and reliability of the measurement results. Through the simple operation of unscrewing the threaded pin, users can easily adjust the position of the clamping part 30 and the gauge 40, as well as replace the gauge 40. This design simplifies the operation process and improves work efficiency.

[0036] More preferably, the device 100 further comprises a carrier plate 50. The carrier plate 50 is fixedly connected to the base 10 and is located between the base 10 and the measuring tool 40 in a direction parallel to the plate surface of the carrier plate 50.

[0037] The carrier plate 50 provides a stable support platform for the aluminum alloy doors and windows to be measured. During the measurement process, the doors and windows can be stably placed on the carrier plate 50, avoiding measurement errors caused by unstable placement. At the same time, the design of the carrier plate 50 also helps to position the doors and windows, ensuring that the measuring tool 40 can accurately align with specific parts of the doors and windows during measurement, thereby improving the accuracy of measurement. The presence of the carrier plate 50 can protect the measurement environment from external interference. For example, it can prevent the influence of uneven ground or debris on the measurement process, ensuring the stability and reliability of the measurement results. The design of the carrier plate 50 makes it easier for the operator to place the doors and windows into the detection device 100 for measurement. Without the need for additional support or fixing tools, the operation process is simplified. At the same time, the presence of the carrier plate 50 also helps to quickly position the doors and windows, thereby shortening the measurement time and improving work efficiency. The carrier plate 50 is fixedly connected to the base 10, forming a more stable structure. This helps to enhance the overall stability of the entire detection device 100, ensuring that there is no shaking or tilting during the measurement process, further improving the accuracy of measurement.

[0038] More preferably, the measuring tool 40 comprises an abutting piece 42 and a display panel. The abutting piece 42 is fixedly connected to the measuring tool 40 and is located on the side of the abutting piece 42 close to the carrier plate 50. The display panel 43 is fixedly connected to the measuring tool 40 and is electrically connected to the sliding rod 20, and is located on the side of the abutting piece 42 away from the carrier plate 50.

[0039] The abutting piece 42 is fixedly connected to the measuring tool 40 and located on the side close to the carrier plate 50. During measurement, the abutting piece 42 directly contacts the aluminum alloy door and window, which can ensure the accuracy of measurement. The design of the abutting piece 42 can adjust its shape, size and material according to actual needs to adapt to the measurement needs of different doors and windows. The abutting piece 42 is not only used for measurement, but also provides stable support for the door and window during measurement. This helps to prevent the door and window from moving or deforming during measurement, thereby affecting the accuracy of the measurement results. The display panel 43 is fixedly connected to the measuring tool 40 and electrically connected with the sliding rod 20, which means that the display panel 43 is connected with the measurement system or control system for displaying the measurement results. It is located on the side of the abutting piece 42 away from the carrier plate 50, which is convenient for the operator to observe the measurement results. The display panel 43 can display the thickness and other parameters of the door and window in real time, so that the operator can quickly obtain the measurement results. Through the display panel 43, the operator can not need to manually record or calculate the measurement results, thereby improving the measurement efficiency. At the same time, the display panel 43 can also provide other related information such as measurement units, error range, etc., which helps the operator to better understand and analyze the measurement results. Integrating the abutting piece 42 and the display panel 43 in the measuring tool 40 makes the structure of the entire detection device 100 more compact. This helps to reduce the floor area and improve the space utilization. The arrangement of the abutting piece 42 and the display panel 43 makes the operation more convenient. The operator only needs to place the door and window on the carrier plate 50, and then adjust the position of the measuring tool 40, and then start measurement. After measurement is completed, the result can be directly read from the display panel 43. The accurate measurement of the abutting piece 42 and the real-time display of the display panel 43 help to improve the accuracy of measurement. At the same time, the display panel 43 can also provide error prompt and other functions to help the operator to find and correct the problems in the measurement process in time.

[0040] More preferably, the first threaded pin 31 is unscrewed, the clamping part 30 drives the measuring tool 40 to slide along the extension direction of the sliding rod 20, and the abutting piece 42 also moves along the extension direction of the sliding rod 20.

[0041] Wherein, by unscrewing the first threaded pin 31, the clamping part 30 and the gauge 40 can freely slide along the sliding rod 20, thereby adjusting the relative position between the abutting piece 42 and the door and window. This design enables the detection device 100 to adapt to aluminum alloy doors and windows of different sizes without the need to replace or adjust the entire device 100, improving the flexibility and versatility of the device 100. The design of the sliding rod 20 provides stable guidance, ensuring the stability and accuracy of the clamping part 30 and the gauge 40 during sliding. When the abutting piece 42 moves along the sliding rod 20, it can accurately contact the measured part of the door and window, thereby obtaining accurate measurement results. After unscrewing the first threaded pin 31 and adjusting the position of the clamping part 30 and the gauge 40, the position of the gauge 40 and the abutting piece 42 can be fixed by tightening the threaded pin again. This design simplifies the operation process and reduces the difficulty of operation, enabling the operator to complete the measurement task more quickly. Since the position of the gauge 40 and the abutting piece 42 can be easily adjusted, the operator can quickly adjust the detection device 100 to a state suitable for the current door and window measurement. This reduces the preparation time before measurement and improves measurement efficiency. Such a design enables the detection device 100 not only to be suitable for the size measurement of aluminum alloy doors and windows, but also to be extended to the measurement of other similar size and shape objects. This enhances the practicality and application range of the device 100.

[0042] More preferably, a plurality of grooves 51 are integrally formed on the carrier plate 50, and the grooves 51 are parallel to each other.

[0043] Wherein, the design of the grooves 51 can increase the contact area between the carrier plate 50 and the aluminum alloy door and window, thereby improving the stability of the door and window during measurement. This helps to prevent the door and window from sliding or tilting during measurement, ensuring the accuracy of the measurement results. The parallel grooves 51 can serve as positioning references when the door and window are placed. The operator can more easily align the door and window with the grooves 51, thereby ensuring the correct position of the door and window during measurement. In addition, the guiding effect of the grooves 51 also helps the operator to quickly adjust the position of the door and window, improving work efficiency. The presence of the grooves 51 can reduce the direct contact area between the carrier plate 50 and the door and window, thereby reducing friction to some extent. This helps to protect the surface of the door and window from scratching or wear, especially when the detection device 100 is used for a long time or frequently. The design of the grooves 51 not only has practicality, but also enhances the aesthetics of the carrier plate 50. The neat lines of the grooves 51 make the carrier plate 50 look more tidy and orderly, meeting modern aesthetic needs. At the same time, the grooves 51 can also serve as decorative elements to enhance the overall grade of the detection device 100. The design of the grooves 51 makes it easier to clean and maintain the surface of the carrier plate 50. The operator can easily remove dust and debris from the grooves 51 using a brush or vacuum cleaner, keeping the carrier plate 50 clean and tidy.

[0044] More preferably, when measuring the thickness of the aluminum alloy door and window, the aluminum alloy door and window is fixedly placed on the object plate 50, the abutting piece 42 abuts against the aluminum alloy door and window, and the display panel 43 displays the thickness of the aluminum alloy door and window.

[0045] In this way, the aluminum alloy door and window is fixedly placed on the object plate 50, which can ensure that the door and window remain stable during measurement and will not cause measurement errors due to movement or shaking. At the same time, the abutting piece 42 directly contacts the door and window, which can accurately transmit the measurement signal, so that the display panel 43 can accurately display the thickness of the door and window. This design simplifies the measurement operation process. The operator only needs to place the door and window on the object plate 50, then adjust the position of the measuring tool 40 so that the abutting piece 42 contacts the door and window, and then read the measurement result on the display panel 43. Without complex settings or adjustments, the operation difficulty is reduced. Due to the simplification of the operation process, the operator can complete the measurement task more quickly. At the same time, the display panel 43 can display the measurement result in real time, so that the operator can quickly obtain the required information, further improving the measurement efficiency. This design makes the measurement process more intuitive and convenient. The operator can intuitively understand the thickness information of the door and window by observing the numbers or graphics on the display panel 43 without additional calculation or conversion. This enhances the user experience and makes the measurement process more friendly and easy to use. This design is not only suitable for the thickness measurement of aluminum alloy doors and windows, but also can be extended to the measurement of other similar size and shape objects. By replacing the appropriate abutting piece 42 and adjusting the measurement parameters, it can adapt to different measurement requirements.

[0046] More preferably, the first threaded pin 31 is located on the side of the sliding rod 20 away from the measuring tool 40.

[0047] The first threaded pin 31 is positioned on the side of the sliding rod 20 away from the gauge 40, so that the operator will not be disturbed by the threaded pin when adjusting the position of the gauge 40. They can more conveniently rotate the threaded pin to secure or release the gauge 40, thus simplifying the operation process. This design makes full use of the space between the sliding rod 20 and the gauge 40. The first threaded pin 31 is located on the side away from the gauge 40, which does not occupy the valuable space between the gauge 40 and the door and window, ensuring the accuracy and stability of the measurement. By positioning the first threaded pin 31 away from the gauge 40, it helps to avoid the operator accidentally touching the threaded pin during the measurement process, which may cause unnecessary adjustment of the position of the gauge 40 or measurement errors. This design improves the reliability and accuracy of the measurement. Such a design helps to maintain the compactness of the entire detection device 100. The first threaded pin 31 is located on the side of the sliding rod 20, which does not increase the width or height of the device 100, making the device 100 more portable, easy to carry and install. When it is necessary to maintain or replace the first threaded pin 31, this design makes it easier for the operator to access the threaded pin for necessary cleaning, lubrication or replacement work. This helps to prolong the service life of the device 100 and maintain its good working condition.

[0048] More preferably, the second threaded pin 41 is located on the side of the clamping portion 30 away from the gauge 40.

[0049] The second threaded pin 41 is positioned on the side of the clamping portion 30 away from the gauge 40, which can ensure that the operator will not be hindered by the threaded pin when adjusting the clamping portion 30 or the gauge 40. They can more conveniently access and rotate the threaded pin to secure or release the clamping portion 30, thus simplifying the operation process. This design helps to reduce the risk of misoperation. Since the second threaded pin 41 is located on the outside of the clamping portion 30, the operator is less likely to accidentally touch it during measurement or adjustment, thus avoiding measurement errors or equipment damage caused by misoperation. By positioning the second threaded pin 41 on the outside of the clamping portion 30, the stability of the structure can be enhanced. The threaded pin serves as a fixing element, and the choice of its position is crucial to ensuring the stability of the clamping portion 30 and the gauge 40 during the measurement process. The outside position can better support and fix the clamping portion 30, reducing displacement caused by vibration or external force. When it is necessary to maintain or replace the second threaded pin 41, this design makes it easier for the operator to access the threaded pin. They do not need to disassemble other parts of the gauge 40 or the clamping portion 30 to perform the necessary cleaning, lubrication or replacement work, which helps to prolong the service life of the equipment and maintain its good working condition. This design also helps to optimize space utilization and aesthetics. By placing the second threaded pin 41 on the outside of the clamping portion 30, it can avoid occupying the space between the gauge 40 and the door and window, while making the entire detection device 100 look more neat and orderly.

[0050] More preferably, the material of the abutting member 42 is formed by one or a combination of stainless steel, aluminum alloy, rubber, nylon, carbon fiber composite material and glass steel.

[0051] Among them, the stainless steel is characterized by high strength, not easy to deform, and can maintain stable performance in various environments to ensure that the abutting member 42 is not easy to be damaged in long-term use, and improve the durability of the device 100. The characteristics of aluminum alloy are light weight and high strength, which can reduce the overall weight of the device 100 and improve portability. The characteristics of rubber are good elasticity, which can fit irregular surfaces, suitable for measuring irregularly shaped or surfaced objects and reducing impact and damage to the object during measurement. The characteristics of nylon are low friction coefficient and good wear resistance, which can improve the wear resistance of the abutting member 42 and prolong the service life. The characteristics of carbon fiber composite material and glass steel are also light weight and high strength, similar to aluminum alloy, which can significantly reduce the weight of the device 100 and improve portability.

[0052] Therefore, by unscrewing the first threaded pin 31, the clamping part 30 slides along the extension direction of the sliding rod 20, so that the measuring tool 40 abuts against the aluminum alloy door and window, improving the accuracy of measurement. And by unscrewing the second threaded pin 41, the measuring tool 40 can be quickly disassembled, effectively improving the efficiency of measurement.

[0053] The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as limiting the scope of the patent of the present application. It should be noted that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application.

Claims

1. An aluminum alloy door and window size detection device for measuring the thickness of an aluminum alloy door and window, characterized by, The device comprises: a base, a sliding rod fixedly connected to the base, a clamping part integrally penetrating a first threaded pin, the first threaded pin fixing the clamping part to the sliding rod, the clamping part integrally formed with a fixing part on a side thereof away from the sliding rod, a measuring tool integrally penetrating a second threaded pin, the second threaded pin fixing the measuring tool in the fixing part, wherein the first threaded pin is unscrewed, the clamping part slides along the extension direction of the sliding rod, and the second threaded pin is unscrewed to disassemble the measuring tool.

2. The aluminum alloy door and window size detection device according to claim 1, characterized in that, The device further comprises: a carrier plate fixedly connected to the base, and located between the base and the measuring tool when viewed in a direction parallel to the plate surface of the carrier plate.

3. The aluminum alloy door and window size detection device according to claim 2, characterized in that, The measuring tool comprises: an abutting piece fixedly connected to the measuring tool and located on a side thereof close to the carrier plate, a display panel fixedly connected to the measuring tool and electrically connected to the sliding rod, and located on a side of the abutting piece away from the carrier plate.

4. The aluminum alloy door and window size detection device according to claim 3, characterized in that, The first threaded pin is unscrewed, the clamping part drives the measuring tool to slide along the extension direction of the sliding rod, and the abutting piece also moves along the extension direction of the sliding rod.

5. The aluminum alloy door and window size detection device according to claim 4, characterized in that, The carrier plate integrally forms a plurality of grooves thereon, the grooves are parallel to each other.

6. The aluminum alloy door and window size detection device according to claim 5, characterized in that, When measuring the thickness of the aluminum alloy door and window, the aluminum alloy door and window is fixedly placed on the carrier plate, the abutting piece abuts against the aluminum alloy door and window, and the display panel displays the thickness of the aluminum alloy door and window.

7. The aluminum alloy door and window size detection device according to claim 1, characterized in that, The first threaded pin is located on a side of the sliding rod away from the measuring tool.

8. The aluminum alloy door and window size detection device according to claim 1, characterized in that, The second threaded pin is located on a side of the clamping part away from the measuring tool.

9. The aluminum alloy door and window size detection device according to claim 3, characterized in that, The material of the abutting piece is formed by one or more of stainless steel, aluminum alloy, rubber, nylon, carbon fiber composite material, and glass steel.