Arc measurement control device with height adjusting structure

Abstract

The utility model provides an arc measurement control device with a height adjusting structure, and belongs to the technical field of measurement tools. The arc measurement control device with the height adjusting structure comprises a tripod, a threaded rod is in threaded connection with the tripod, at least one lengthening rod is detachably arranged at the top end of the threaded rod, an electromagnetic switch is detachably arranged at the top end of the lengthening rod, and a measuring assembly is installed on the electromagnetic switch; wherein the measuring assembly is used for measuring the radian of an arc, and the electromagnetic switch is used for controlling the measuring assembly to be turned on and turned off. According to the arc measurement control device with the height adjusting structure, the measurement height of the device is adjusted, the arc angle is automatically measured, the corresponding arc radian is calculated, and the measurement efficiency and the measurement precision are improved.

Description

Technical Field

[0001] This disclosure relates to the field of measuring tool technology, and in particular to a circular arc measuring and control device with a height adjustment structure. Background Technology

[0002] During the design, construction, and maintenance phases of a building, accurate acquisition of various parameters is crucial to ensure construction quality and maintain the building's safety and aesthetics. The curvature of an arc is a vital architectural parameter. Current technology typically utilizes a protractor to measure the angle and chord length of the arc to calculate its curvature. However, this measuring tool has the following drawbacks: 1. Existing protractors are only suitable for measuring the curvature of low-rise buildings. When dealing with higher-positioned building arcs, the difficulty in approaching the target hinders effective measurement, and climbing for measurements also poses significant safety hazards; 2. Existing protractors have low automation levels, relying on manual reading and operation, resulting in high labor costs, low measurement efficiency, and susceptibility to human error, reducing measurement accuracy.

[0003] To address the above issues, a circular arc measurement and control device with a height-adjustable structure was designed. Utility Model Content

[0004] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide a circular arc measurement and control device with a height adjustment structure, so as to realize the adjustment of the measurement height, automatic measurement of the arc angle, and improve the measurement efficiency and measurement accuracy.

[0005] To achieve the aforementioned objectives of this utility model, the present disclosure adopts the following technical solution:

[0006] A circular arc measurement and control device with a height-adjustable structure includes a tripod, on which a threaded rod is threadedly connected. At least one extension rod is detachably provided at the top end of the threaded rod, and an electromagnetic switch is detachably provided at the top end of the extension rod. A measurement component is installed on the electromagnetic switch.

[0007] The measuring component is used to measure the arc radius, and the electromagnetic switch is used to control the opening and closing of the measuring component.

[0008] In one exemplary embodiment of this disclosure, the number of extension rods is at least two;

[0009] At least two of the extension rods are detachably mounted sequentially at the top of the threaded rod.

[0010] In one exemplary embodiment of this disclosure, the electromagnetic switch includes:

[0011] The first housing is detachably mounted on the top of the extension rod;

[0012] An electromagnet is provided on the inner wall of the bottom end of the first housing. A guide hole is provided on the electromagnet, and a guide sleeve is slidably installed in the guide hole. The top end of the guide sleeve extends out to connect the electromagnet and the magnetic absorbing piece. The magnetic absorbing piece is slidably installed in the first housing.

[0013] A first spring is disposed inside the guide sleeve. One end of the first spring is connected to the magnetic plate, and the other end of the first spring extends into the guide hole and is connected to the first housing.

[0014] A trigger rod is located at the top of the magnetic plate, and the top of the trigger rod extends out of the first housing. The trigger rod can reciprocate within the first housing. A protrusion is provided on the upper outer wall of the trigger rod, and the protrusion is used to limit the position of the measuring component.

[0015] In one exemplary embodiment of this disclosure, the measurement component includes:

[0016] A second housing is disposed on the first housing, and a retaining ring is provided on the second housing;

[0017] A third housing is rotatably mounted inside the fixed ring. A second spring is provided inside the third housing. One end of the second spring is connected to the third housing, and the other end of the second spring is connected to the second housing.

[0018] A sleeve is disposed inside the third housing, and the second spring is sleeved on the sleeve. A guide groove is provided on the inner circumferential wall of the sleeve. The top end of the trigger rod extends into the sleeve and can reciprocate within the sleeve. The protrusion is slidably installed in the guide groove.

[0019] In one exemplary embodiment of this disclosure, a second measuring arm is provided on one outer wall of the third housing, a connecting rod is provided on the other outer wall of the third housing, a first measuring arm is provided above the connecting rod, and the first measuring arm is fixedly connected to the fixing ring.

[0020] In one exemplary embodiment of this disclosure, extension arms are slidably mounted on the first measuring arm and the second measuring arm, and micro switches are provided on the extension arms.

[0021] In an exemplary embodiment of this disclosure, the first measuring arm and the second measuring arm are each provided with at least one axially extending mounting groove, and the extension arm is provided with at least one threaded post corresponding to the mounting groove, and a nut is threadedly connected to the threaded post;

[0022] The extension arm is connected to the first measuring arm and the second measuring arm respectively via the threaded post and nut.

[0023] In one exemplary embodiment of this disclosure, a controller is provided on the second housing, and the controller is electrically connected to the electromagnet and the micro switch respectively.

[0024] In one exemplary embodiment of this disclosure, a resistor sheet is provided on the circumferential inner wall of the second housing, and a sliding contact is provided on the connecting rod to abut against the resistor sheet. The controller is electrically connected to the resistor sheet and the sliding contact respectively.

[0025] In one exemplary embodiment of this disclosure, the third housing is rotatably connected to the fixed ring via a bearing.

[0026] The beneficial effects of this disclosure are:

[0027] (1) This invention adjusts the height of the measuring device by using a tripod, a threaded rod and multiple extension rods, thereby breaking through the height limitations of existing measuring equipment, enabling the measurement of high-position building arcs, and improving the range of applications of the measuring device.

[0028] (2) This disclosure controls the opening and closing of the measuring component by electromagnetic switch, and measures the building arc by measuring the arc, realizes automatic measurement of the arc angle, and calculates the corresponding arc curvature, which improves the measurement efficiency and measurement accuracy, avoids the safety hazards caused by high-altitude measurement, and has high measurement safety. Attached Figure Description

[0029] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0030] Figure 1 This is a schematic diagram of the structure of a circular arc measuring and control device with a height adjustment structure in one embodiment of the present disclosure;

[0031] Figure 2 This is a cross-sectional view of an electromagnetic switch in one embodiment of the present disclosure;

[0032] Figure 3 This is a schematic diagram of the structure of the measuring component in one embodiment of the present disclosure;

[0033] Figure 4 This is a cross-sectional view of the measuring component in one embodiment of the present disclosure;

[0034] Figure 5 This is a schematic diagram of the structure of the second housing in one embodiment of the present disclosure;

[0035] Figure 6 This is a schematic diagram of the structure of the third housing in one embodiment of the present disclosure.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Tripod; 11. Threaded rod; 12. Extension rod; 2. Electromagnetic switch; 21. First housing; 22. Electromagnet; 23. Guide hole; 24. Guide sleeve; 25. First spring; 26. Magnetic plate; 27. Trigger rod; 28. Protrusion; 3. Measuring assembly; 31. Second housing; 32. Fixing ring; 33. First measuring arm; 34. Bearing; 35. Third housing; 36. Second spring; 37. Sleeve; 38. Guide groove; 39. Connecting rod; 310. Sliding contact; 311. Second measuring arm; 312. Extension arm; 313. Threaded post; 314. Nut; 315. Mounting groove; 316. Resistance element; 317. Controller; 318. Micro switch. Detailed Implementation

[0038] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore detailed descriptions of them will be omitted. Furthermore, the drawings are merely illustrative of this disclosure and are not necessarily drawn to scale.

[0039] Although relative terms such as "up" and "down" are used in this specification to describe the relative relationship of one component of an icon to another, these terms are used only for convenience, such as according to the orientation of the examples shown in the accompanying drawings. It is understood that if the device of the icon is flipped upside down, the component described as "up" will become the component described as "down." When a structure is "up" of another structure, it may mean that the structure is integrally formed on the other structure, or that the structure is "directly" mounted on the other structure, or that the structure is "indirectly" mounted on the other structure through another structure.

[0040] The terms “a,” “one,” “the,” “the,” and “at least one” are used to indicate the presence of one or more elements / components / etc.; the terms “including” and “having” are used to indicate an open-ended inclusion and to mean that there may be other elements / components / etc. in addition to the listed elements / components / etc.; the terms “first,” “second,” and “third,” etc., are used only as markers and are not a limitation on the number of objects.

[0041] This disclosure provides a circular arc measurement and control device with a height adjustment structure. See [link to previous section]. Figure 1 The device includes a tripod 1, on which a threaded rod 11 is threadedly connected. At least one extension rod 12 is detachably mounted on the top of the threaded rod 11. An electromagnetic switch 2 is detachably mounted on the top of the extension rod 12. A measuring component 3 is mounted on the electromagnetic switch 2. The measuring component 3 is used to measure the arc radius, and the electromagnetic switch 2 is used to control the opening and closing of the measuring component 3.

[0042] In this embodiment, the arc measurement and control device with height adjustment structure consists of a tripod 1, a threaded rod 11, an extension rod 12, an electromagnetic switch 2, and a measuring component 3. The threaded rod 11 is threadedly connected to the tripod 1. The extension rod 12 is detachably mounted on the top of the threaded rod 11. The electromagnetic switch 2 is detachably mounted on the top of the extension rod 12. The measuring component 3 is mounted on the electromagnetic switch 2. The tripod 1 keeps the entire device stable. The threaded rod 11 and the extension rod 12 adjust the height of the electromagnetic switch 2 and the measuring component 3. The electromagnetic switch 2 controls the start and reset of the measuring component 3. The measuring component 3 completes the measurement of the building's arc.

[0043] Compared to existing protractor measurements, this arc measurement control device with a height-adjustable structure uses a tripod, threaded rod, and multiple extension rods to adjust the height of the measuring device, breaking through the height limitations of existing measuring equipment. This enables the measurement of high-altitude building arcs, expanding the device's application range. The electromagnetic switch controls the opening and closing of the measuring components, which then measure the building arc, automatically measuring the arc angle and calculating the corresponding arc radius. This improves measurement efficiency and accuracy, avoids safety hazards associated with high-altitude measurements, and ensures high measurement safety.

[0044] In one embodiment of this disclosure, the number of extension rods 12 is at least two; at least two extension rods 12 are detachably and sequentially mounted on the top of the threaded rod 11. Thus, the height of the electromagnetic switch 2 and the measuring component 3 can be quickly adjusted by changing the number of extension rods 12, enabling the measurement of building arcs at different heights.

[0045] It is understandable that when there is only one extension rod 12, the height of the electromagnetic switch 2 and the measuring component 3 is adjusted only by the threaded rod 11; when there are at least two extension rods 12, the height of the electromagnetic switch 2 and the measuring component 3 is adjusted by adjusting the number of extension rods 12, and the height of the electromagnetic switch 2 and the measuring component 3 is finely adjusted by the threaded rod 11.

[0046] In one embodiment of this disclosure, the threaded rod 11 is threadedly connected to the extension rod 12, two adjacent extension rods 12 are threadedly connected, and the electromagnetic switch 2 is threadedly connected to the extension rod 12.

[0047] In one embodiment of this disclosure, see [link to relevant documentation]. Figure 2 The electromagnetic switch 2 includes: a first housing 21, detachably mounted on the top of the extension rod 12; an electromagnet 22, located on the inner wall of the bottom end of the first housing 21, with a guide hole 23 on the electromagnet 22, a guide sleeve 24 slidably mounted in the guide hole 23, the top of the guide sleeve 24 extending out of the electromagnet 22 and connecting to a magnetic suction plate 26, the magnetic suction plate 26 being slidably mounted inside the first housing 21; a first spring 25, located inside the guide sleeve 24, one end of the first spring 25 connected to the magnetic suction plate 26, the other end of the first spring 25 extending into the guide hole 23 and connecting to the first housing 21; and a trigger rod 27, located on the top of the magnetic suction plate 26, the top of the trigger rod 27 extending out of the first housing 21, the trigger rod 27 being able to reciprocate within the first housing 21, and a protrusion 28 provided on the upper outer wall of the trigger rod 27, the protrusion 28 being used to limit the movement of the measuring component 3. In this way, the opening and closing of the measuring component 3 can be controlled, facilitating the measurement of building arcs and improving the measurement efficiency of the device.

[0048] Understandably, the electromagnet 22 is used to generate magnetic attraction when energized, attracting the magnetic absorbing piece 26, causing the magnetic absorbing piece 26 to move downward along the first housing 21. The trigger rod 27 and guide sleeve 24 on it also move downward. The guide sleeve 24 moves downward along the guide hole 23 and compresses the first spring 25. The protrusion 28 on the trigger rod 27 moves within the measuring assembly 3, thereby activating the measuring assembly 3 to measure the building arc. The first spring 25 is used to provide a reset force for the magnetic absorbing piece 26 after the electromagnet 22 is de-energized.

[0049] In one embodiment of this disclosure, see [link to relevant documentation]. Figures 3 to 6 The measuring component 3 includes: a second housing 31, disposed on the first housing 21, with a fixing ring 32 on the second housing 31; a third housing 35, rotatably mounted inside the fixing ring 32, with a second spring 36 disposed inside the third housing 35, one end of the second spring 36 connected to the third housing 35 and the other end of the second spring 36 connected to the second housing 31; a sleeve 37, disposed inside the third housing 35, with the second spring 36 sleeved on the sleeve 37, a guide groove 38 disposed on the inner circumferential wall of the sleeve 37, the top end of a trigger rod 27 extending into the sleeve 37, the trigger rod 27 being able to reciprocate within the sleeve 37, and a protrusion 28 slidably mounted within the guide groove 38; a second measuring arm 311 disposed on one outer wall of the third housing 35, a connecting rod 39 disposed on the other outer wall of the third housing 35, a first measuring arm 33 disposed above the connecting rod 39, and the first measuring arm 33 being fixedly connected to the fixing ring 32. Thus, by cooperating with the protrusion 28 and the guide groove 38, the position of the second measuring arm 311 is adjusted, and the angle to be measured is determined by the included angle between the first measuring arm 33 and the second measuring arm 311.

[0050] Understandably, the protrusion 28 moves downward within the guide groove 38, causing the sleeve 37 and the third housing 35 to rotate, which in turn causes the second spring 36 to tighten, thereby causing the second measuring arm 311 and the connecting rod 39 to rotate and adjust the angle between the first measuring arm 33 and the second measuring arm 311. Thus, the angle to be measured is determined by the angle between the first measuring arm 33 and the second measuring arm 311.

[0051] In one embodiment of this disclosure, see [link to relevant documentation]. Figure 3 Extension arms 312 are slidably mounted on the first measuring arm 33 and the second measuring arm 311, respectively. This allows for adjustment of the measuring range of the measuring component 3, enabling the measurement of arcs on different buildings to meet various measurement needs.

[0052] Optionally, see Figure 3 A micro switch 318 is installed on the extension arm 312. This allows for the detection of whether the extension arm 312 is in contact with the object being measured, facilitating the measurement of building arcs.

[0053] In one embodiment of this disclosure, see [link to relevant documentation]. Figures 3 to 6 The first measuring arm 33 and the second measuring arm 311 are each provided with at least one axially extending mounting groove 315. The extension arm 312 is provided with at least one threaded post 313 corresponding to the mounting groove 315, and a nut 314 is threadedly connected to the threaded post 313. The extension arm 312 is connected to the first measuring arm 33 and the second measuring arm 311 respectively through the threaded post 313 and the nut 314. In this way, the extension arm 312 can be easily installed on the first measuring arm 33 and the second measuring arm 311, and the relative position of the extension arm 312 to the first measuring arm 33 and the second measuring arm 311 can be easily adjusted to meet different measurement needs.

[0054] In one example, the first measuring arm 33 and the second measuring arm 311 each have two axially extending mounting slots 315, and the extension arm 312 is provided with two threaded posts 313 corresponding to the mounting slots 315. The threaded posts 313 pass through the corresponding mounting slots 315 and are threadedly connected to the nuts 314.

[0055] In another embodiment of this disclosure, both the first measuring arm 33 and the second measuring arm 311 are electrically telescopic arms, and micro switches 318 are respectively provided at the ends of the first measuring arm 33 and the second measuring arm 311 that are far apart from each other. In this way, the size of the first measuring arm 33 and the second measuring arm 311 can be automatically adjusted, which facilitates and quickly adjusts the measuring range of the measuring component 3 to meet different measuring needs.

[0056] In one embodiment of this disclosure, see [link to relevant documentation]. Figure 3 and Figure 4A controller 317 is installed on the second housing 31, and the controller 317 is electrically connected to the electromagnet 22 and the micro switch 318. In this way, the measuring device can be automatically controlled, improving the measurement efficiency and accuracy of the device.

[0057] Optionally, the mounting position of the micro switch 318 can be determined by a scale set on the extension arm 312 and preset in the controller 317 before measurement.

[0058] In one embodiment of this disclosure, see [link to relevant documentation]. Figure 3 and Figure 6 A resistor 316 is provided on the inner circumferential wall of the second housing 31, and a sliding contact 310 that abuts against the resistor 316 is provided on the connecting rod 39. The controller 317 is electrically connected to the resistor 316 and the sliding contact 310 respectively. In this way, the angle of the arc can be represented by the effective resistance value between the end of the resistor 316 and the sliding contact 310.

[0059] Understandably, the third housing 35 drives the second measuring arm 311 and the connecting rod 39 to rotate, causing the sliding contact 310 on the connecting rod 39 to slide on the resistive plate 316, thus changing the effective resistance. When the controller 317 receives signals from the two microswitches 318 at the same time, it automatically records the effective resistance value at this time, thereby representing the angle of the currently measured arc.

[0060] In one embodiment of this disclosure, see [link to relevant documentation]. Figure 3 and Figure 4 The third housing 35 is rotatably connected to the fixed ring 32 via a bearing 34. This allows the third housing 35 to rotate easily within the fixed ring 32.

[0061] In one embodiment of this disclosure, see Figures 1 to 6 The working process of the arc measurement and control device with height adjustment structure is briefly described as follows:

[0062] In use, the tripod 1 is first placed on a horizontal surface. The electromagnetic switch 2 and the measuring component 3 are then mounted on the extension rod 12, which is mounted on the threaded rod 11. The number of extension rods 12 is adjusted according to the height requirements. The extension rods 12 are connected in series by a threaded connection. By rotating the threaded rod 11, the height of the electromagnetic switch 2 and the measuring component 3 is further fine-tuned. After the height adjustment is completed, the micro switch 318 on one side of the first measuring arm 33 is pressed against the arc surface of the building to be measured. After the micro switch 318 is triggered, the controller 317 on the second housing 31 controls the electromagnet 22. When energized, the electromagnet 22 generates a magnetic attraction force, attracting the magnetic plate 26. This causes the magnetic plate 26 to move downwards along the first housing 21, and the trigger rod 27 and guide sleeve 24 on it also move downwards. The guide sleeve 24 moves downwards along the guide hole 23 and compresses the first spring 25. The protrusion 28 on the trigger rod 27 moves downwards in the guide groove 38, causing the sleeve 37 and the third housing 35 to rotate, thus tightening the second spring 36. This causes the second measuring arm 311 and the connecting rod 39 to rotate, and the micro switch 318 on one side of the second measuring arm 311 is pressed against the building surface. At the same time, the connecting rod 39... The sliding contact 310 slides on the resistive element 316, changing the effective resistance. When the controller 317 receives signals from both microswitches 318 simultaneously, it automatically records the effective resistance value to characterize the angle of the measured arc. The distance between the two microswitches 318 is the chord length. The controller 317 can calculate the arc length using the chord length and the arc angle, and record and announce the result. When the microswitch 318 on one side of the first measuring arm 33 detaches from the building surface, the controller 317 de-energizes the electromagnet 22, and under the elastic action of the first spring 25... The trigger rod 27 moves upward to reset, causing the protrusion 28 to move upward in the guide groove 38, which in turn causes the sleeve 37 and the third housing 35 to rotate in opposite directions. The second spring 36 returns to its original state, and the auxiliary sleeve 37 and the third housing 35 rotate in opposite directions, causing the second measuring arm 311 and the connecting rod 39 to rotate in opposite directions, so that the measuring assembly 3 returns to its initial state, which is convenient for the next measurement. The extension arm 312 on the first measuring arm 33 and the second measuring arm 311 can be adjusted in position according to the actual measurement needs. The threaded post 313 in the mounting groove 315 cooperates with the nut 314 to lock the extension arm 312.

[0063] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

Claims

1. A circular arc measurement and control device with a height-adjustable structure, comprising a tripod (1), characterized in that, The tripod (1) is threaded with a threaded rod (11), and at least one extension rod (12) is detachably provided at the top of the threaded rod (11). An electromagnetic switch (2) is detachably provided at the top of the extension rod (12), and a measuring component (3) is installed on the electromagnetic switch (2). The measuring component (3) is used to measure the arc radius, and the electromagnetic switch (2) is used to control the opening and closing of the measuring component (3).

2. The circular arc measuring and control device with a height adjustment structure according to claim 1, characterized in that, The number of the extension rods (12) is at least two; At least two of the extension rods (12) are detachably mounted on the top of the threaded rod (11).

3. The circular arc measuring and control device with a height-adjustable structure according to claim 1, characterized in that, The electromagnetic switch (2) includes: The first housing (21) is detachably mounted on the top of the extension rod (12); An electromagnet (22) is provided on the inner wall of the bottom end of the first housing (21). A guide hole (23) is provided on the electromagnet (22). A guide sleeve (24) is slidably installed in the guide hole (23). The top end of the guide sleeve (24) extends out of the electromagnet (22) and connects with the magnetic absorbing piece (26). The magnetic absorbing piece (26) is slidably installed in the first housing (21). A first spring (25) is disposed inside the guide sleeve (24). One end of the first spring (25) is connected to the magnetic absorbing piece (26), and the other end of the first spring (25) extends into the guide hole (23) and is connected to the first housing (21). A trigger rod (27) is located at the top of the magnetic absorbing plate (26). The top of the trigger rod (27) extends out of the first housing (21). The trigger rod (27) can reciprocate within the first housing (21). A protrusion (28) is provided on the upper outer wall of the trigger rod (27). The protrusion (28) is used to limit the position of the measuring component (3).

4. The circular arc measuring and control device with a height adjustment structure according to claim 3, characterized in that, The measurement component (3) includes: The second housing (31) is disposed on the first housing (21), and a retaining ring (32) is provided on the second housing (31). The third housing (35) is rotatably installed inside the fixed ring (32). A second spring (36) is provided inside the third housing (35). One end of the second spring (36) is connected to the third housing (35), and the other end of the second spring (36) is connected to the second housing (31). A sleeve (37) is disposed inside the third housing (35), and the second spring (36) is sleeved on the sleeve (37). A guide groove (38) is provided on the inner wall of the sleeve (37). The top end of the trigger rod (27) extends into the sleeve (37). The trigger rod (27) can reciprocate within the sleeve (37). The protrusion (28) is slidably installed in the guide groove (38).

5. The arc measuring and control device with a height-adjustable structure according to claim 4, characterized in that, A second measuring arm (311) is provided on one side of the outer wall of the third housing (35), and a connecting rod (39) is provided on the other side of the outer wall of the third housing (35). A first measuring arm (33) is provided above the connecting rod (39), and the first measuring arm (33) is fixedly connected to the fixing ring (32).

6. The circular arc measuring and control device with a height adjustment structure according to claim 5, characterized in that, An extension arm (312) is slidably mounted on the first measuring arm (33) and the second measuring arm (311), and a micro switch (318) is provided on the extension arm (312).

7. The circular arc measuring and control device with a height-adjustable structure according to claim 6, characterized in that, The first measuring arm (33) and the second measuring arm (311) are respectively provided with at least one axially extending mounting groove (315), and the extension arm (312) is provided with at least one threaded post (313) corresponding to the mounting groove (315), and a nut (314) is threadedly connected to the threaded post (313). The extension arm (312) is connected to the first measuring arm (33) and the second measuring arm (311) respectively through the threaded post (313) and the nut (314).

8. The circular arc measuring and control device with a height-adjustable structure according to claim 5, characterized in that, The second housing (31) is provided with a controller (317), which is electrically connected to the electromagnet (22) and the micro switch (318).

9. The circular arc measuring and control device with a height adjustment structure according to claim 8, characterized in that, The second housing (31) has a resistor (316) on its circumferential inner wall, and the connecting rod (39) has a sliding contact (310) that abuts against the resistor (316). The controller (317) is electrically connected to the resistor (316) and the sliding contact (310) respectively.

10. The arc measuring and control device with a height-adjustable structure according to claim 4, characterized in that, The third housing (35) is rotatably connected to the fixed ring (32) via a bearing (34).

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