A shaft part length measuring device

Abstract

This utility model discloses a length measuring device for shaft parts, including a bracket, a push plate, a baffle, a pushing power component, and a linear displacement sensor. The bracket has a placement groove with open ends. The push plate is movably disposed at the front end of the placement groove, and the baffle is fixedly disposed at the rear end of the placement groove. The pushing power component is connected to the push plate. The contact point of the linear displacement sensor faces the push plate. The shaft part to be measured is placed in the placement groove. The pushing power component drives the push plate to move the shaft part to be measured and the contact point of the linear displacement sensor towards the baffle until the shaft part to be measured contacts the baffle. This utility model significantly reduces the manual intervention in the measurement process, effectively meets the high-efficiency inspection requirements in mass production scenarios, avoids human error, and improves the accuracy of dimensional inspection.

Description

Technical Field

[0001] This utility model relates to the field of precision hardware processing technology, and in particular to a length measuring device for shaft parts. Background Technology

[0002] Currently, in China's precision hardware processing industry, especially in the CNC machining of shaft parts, product length measurement is generally done using handheld digital calipers. This method is extremely inefficient and cannot directly determine whether the dimensions meet requirements. Operators must perform mental calculations and compare the dimensions with standard specifications to determine if the length is up to standard. As the operation time increases, operators are prone to becoming desensitized and making mistakes. Although there are automatic measuring devices for shaft parts on the market, they still require manual assistance during measurement, making them essentially manual measurements with relatively low efficiency. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a length measuring device for shaft parts.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] This utility model provides a length measuring device for shaft parts, including a bracket, a push plate, a baffle, a pushing power component, and a linear displacement sensor. The bracket has a placement groove with open ends. The push plate is movably disposed at the front end of the placement groove, and the baffle is fixedly disposed at the rear end of the placement groove. The pushing power component is drivenly connected to the push plate, and the contact point of the linear displacement sensor faces the push plate. When the shaft part to be measured is placed in the placement groove, the pushing power component drives the push plate to push the shaft part to be measured and the contact point of the linear displacement sensor toward the baffle until the shaft part to be measured contacts the baffle.

[0006] Furthermore, the distance from the front end to the rear end of the placement groove is less than or equal to the length of the shaft-like part to be tested.

[0007] Furthermore, when the shaft part to be tested is placed in the placement groove and is in the initial position, the end of the shaft part to be tested that is in contact with the push plate extends out of the front end face of the placement groove.

[0008] Furthermore, when the shaft part to be tested is placed in the placement slot and is in the initial position, the contact point of the linear displacement sensor is flush with the end of the shaft part to be tested that contacts the push plate.

[0009] Furthermore, it also includes a proximity sensor switch, which is disposed near the placement slot.

[0010] Furthermore, the bracket has a slit in the middle, so that when the shaft part to be tested is placed in the placement slot, the part of the shaft part to be tested located at the slit is in a suspended state.

[0011] Furthermore, the placement slot is located at the top of the bracket, and the cross-section of the placement slot is V-shaped.

[0012] Furthermore, it also includes a control box, a controller, a display screen, and a switch button. The controller is located inside the control box, and the display screen and the switch button are located on the front of the control box. The linear displacement sensor and the display screen are electrically connected to the controller.

[0013] Furthermore, it also includes a three-color alarm light, which is electrically connected to the controller and is located on the top of the control box.

[0014] Furthermore, it also includes a buzzer, which is electrically connected to the controller and is located inside the control box.

[0015] The beneficial effects of this utility model compared with the prior art are as follows: A shaft part length measuring device includes a bracket, a push plate, a baffle, a pushing power component, and a linear displacement sensor. The bracket is provided with a placement groove with open ends. The push plate is movably disposed at the front end of the placement groove, and the baffle is fixedly disposed at the rear end of the placement groove. The pushing power component is connected to the push plate in a transmission manner. The contact point of the linear displacement sensor faces the push plate. The shaft part to be measured is placed in the placement groove, and the pushing power component drives the push plate to push the shaft part to be measured and the contact point of the linear displacement sensor toward the baffle until the shaft part to be measured contacts the baffle. This device automatically moves the shaft part to be measured by driving a push plate through a power component, eliminating the need for manual operation of pushing and positioning. This significantly reduces manual intervention in the measurement process, enabling rapid length measurement of single shaft parts and effectively meeting the high-efficiency inspection requirements of mass production scenarios. Simultaneously, the push plate and baffle work together to achieve stable positioning of the shaft part under test. The smooth movement of the push plate ensures accurate contact between the shaft part and the baffle, avoiding measurement deviations caused by human factors such as differences in operating techniques and reading errors during manual measurement. Furthermore, by directly acquiring measurement data through a linear displacement sensor, error transmission from intermediate links is reduced, resulting in a more accurate reflection of the actual length of the shaft part under test and improving the accuracy of product length dimension detection.

[0016] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model, it can be implemented according to the contents of the specification. In order to make the above and other objectives, features and advantages of this utility model more obvious and easy to understand, the following are preferred embodiments, which are described in detail below. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the structure of a shaft-type part length measuring device provided in a specific embodiment of this utility model;

[0019] Figure 2 A partial structural schematic diagram of a shaft-type part length measuring device provided for a specific embodiment of this utility model (with the shaft-type part to be measured placed thereon);

[0020] Figure 3 A partial structural schematic diagram of a shaft-type part length measuring device provided for a specific embodiment of this utility model (without the shaft-type part to be measured placed);

[0021] Figure 4 This is a schematic diagram of the installation of the push plate and the pushing power component in a shaft part length measuring device provided for a specific embodiment of this utility model.

[0022] Figure Labels

[0023] 1. Base plate; 2. Bracket; 21. Placement slot; 22. Cutout; 3. Push plate; 4. Baffle; 5. Pushing power component; 6. Linear displacement sensor; 61. Contact point; 7. Proximity sensor switch; 8. Control box; 81. Display screen; 82. Switch button; 83. Three-color alarm light; 100. Shaft-type parts to be tested. Detailed Implementation

[0024] The technical solution of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0029] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0030] like Figures 1 to 4 As shown, this utility model embodiment provides a shaft part length measuring device, including a base plate 1, and a bracket 2, a push plate 3, a baffle 4, a pushing power component 5, and a linear displacement sensor 6 disposed on the base plate 1. The bracket 2 is provided with a placement groove 21 with open ends. The push plate 3 is movably disposed at the front end of the placement groove 21, and the baffle 4 is fixedly disposed at the rear end of the placement groove 21. The pushing power component 5 is connected to the push plate 3 in a transmission manner. The contact point 61 of the linear displacement sensor 6 faces the push plate 3. The shaft part 100 to be measured is placed in the placement groove 21. The pushing power component 5 drives the push plate 3 to push the shaft part 100 to be measured and the contact point 61 of the linear displacement sensor 6 towards the baffle 4 until the shaft part 100 to be measured contacts the baffle 4.

[0031] By driving the push plate 3 through the power component 5, the shaft part 100 to be measured is automatically moved, eliminating the need for manual operation of pushing and positioning. This significantly reduces the manual intervention in the measurement process, enabling rapid length measurement of a single shaft part and effectively meeting the high-efficiency inspection requirements in mass production scenarios. Simultaneously, the push plate 3 and baffle 4 work together to achieve stable positioning of the shaft part 100. The smooth movement of the push plate 3 driven by the power component 5 ensures accurate contact between the shaft part 100 and the baffle 4, avoiding measurement deviations caused by human factors such as differences in operating techniques and reading errors during manual measurement. Furthermore, the measurement data is directly acquired through the linear displacement sensor 6, reducing error transmission in intermediate stages and more accurately reflecting the actual length of the shaft part 100, thus improving the accuracy of product length dimension detection.

[0032] The bracket 2 is rectangular in shape and is made of high-strength aluminum alloy. The length direction of the placement groove 21 is consistent with the length direction of the bracket 2. The front end of the placement groove 21 is close to the push plate 3, and the rear end of the placement groove 21 is close to the baffle 4.

[0033] The push plate 3 is a rectangular plate structure. The surface of the push plate 3 is perpendicular to the length direction of the placement groove 21. The cross-sectional area of ​​the push plate 3 is at least greater than the sum of the areas formed by the shaft part to be tested 100 and the contact point 61 of the linear displacement sensor 6. In this way, the push plate 3 can apply force to the shaft part to be tested 100 and the contact point 61 of the linear displacement sensor 6 at the same time.

[0034] The baffle 4 is also a rectangular plate structure, which is fixedly connected to the rear end of the bracket 2 by internal hex bolts. Its plate surface is perpendicular to the length direction of the placement groove 21, and the inner side of the baffle 4 is flush with the rear opening edge of the placement groove 21, so as to ensure that the shaft parts can be axially positioned when they come into contact with the baffle 4.

[0035] The driving power component 5 can be a dual-shaft cylinder. The cylinder body of the driving power component 5 is fixed to the base plate 1 by bolts. The piston rod end of the driving power component 5 is rigidly connected to the middle of the push plate 3 through a floating plate. This connection method can effectively compensate for installation errors and avoid the push plate 3 from getting stuck during movement.

[0036] The linear displacement sensor 6 can be a KTC-50 rod-type displacement sensor. Its fixed end is fixedly installed on the side of the bracket 2 through the base plate 1. The axis of the contact 61 of the linear displacement sensor 6 is parallel to the length direction of the placement groove 21, and the front end of the contact 61 faces the direction of the push plate 3.

[0037] During measurement, the shaft part 100 to be measured is placed in the placement groove 21, with the axis of the part aligned with the length direction of the placement groove 21. After starting the device, the power component 5 drives the push plate 3 to move forward along the placement groove 21. The front end of the push plate 3 contacts one end of the shaft part and pushes it towards the baffle 4. Simultaneously, the end of the shaft part 100 to be measured contacts the contact point 61 of the linear displacement sensor 6 and pushes the contact point 61 to move synchronously until the other end of the shaft part 100 to be measured is in close contact with the inner surface of the baffle 4. At this point, the push plate 3 stops moving, and the linear displacement sensor 6 records the displacement of the contact point 61. This displacement corresponds to the length of the shaft part, and the actual length of the part can be obtained through a preset calculation formula.

[0038] It should be noted that the aforementioned "linear displacement sensor 6 records the displacement of contact point 61, and the displacement corresponds to the length of the shaft part" and "preset calculation formula" are based on existing technology in this field. Specifically, the principle and calculation logic are as follows: In the initial measurement state, the front face of contact point 61 of linear displacement sensor 6 is flush with the end face of the shaft part 100 near the push plate 3. At this time, the initial displacement value recorded by linear displacement sensor 6 is a fixed reference value (which can be set to 0 or a certain initial reading; this setting method is standard practice in this field). When the pushing power component 5 drives the push plate 3 to push the shaft part 100 towards the baffle 4 until the shaft part 100 contacts the baffle 4 and stops moving, the contact point 61 of linear displacement sensor 6 is displaced by the shaft part 100, and the linear sensor records a final displacement value. Since the distance that the pusher plate 3 pushes the shaft part 100 to be measured to move is equal to the displacement of the contact 61 of the linear displacement sensor 6 (the two move synchronously), and this displacement is exactly equal to the difference between the length of the shaft part 100 to be measured and the distance from the front end to the rear end of the placement groove 21 (when the distance from the front end to the rear end of the placement groove 21 is a fixed value). The preset calculation formula is essentially a simple mathematical operation based on the above displacement relationship. For example, if the reading of the linear displacement sensor 6 is S0 in the initial state and S1 at the end of the measurement, and the distance from the front end to the rear end of the placement groove 21 is L0 (a fixed value), then the length of the shaft part 100 to be measured is L = L0 + (S1 - S0). The derivation logic of this formula is based on the superposition principle of geometric displacement, which belongs to the existing technical content that can be understood and derived by those skilled in the art based on conventional measurement logic.

[0039] It should be noted that the distance from the front end to the rear end of the placement groove 21 is less than or equal to the length of the shaft part 100 to be measured. This design ensures that the shaft part 100 can effectively contact the baffle 4 during the measurement process, thereby achieving accurate positioning and length measurement. Specifically, if the distance from the front end to the rear end of the placement groove 21 is greater than the length of the shaft part 100 to be measured, when the push plate 3 pushes the part towards the baffle 4, even if the part has completely entered the placement groove 21, the end away from the push plate 3 cannot contact the baffle 4, resulting in the part not being accurately positioned. Consequently, the linear displacement sensor 6 cannot obtain effective displacement data based on the actual position of the part, and therefore cannot calculate the true length of the part. When the distance from the front end to the rear end of the placement groove 21 is less than or equal to the length of the shaft part 100 to be measured, for example, if the distance from the front end to the rear end of the placement groove 21 is set to 100mm and the length of the shaft part 100 to be measured is in the range of 100-150mm, after the shaft part 100 to be measured is placed in the placement groove 21, the end of it that is far away from the push plate 3 will inevitably extend beyond the rear end of the placement groove 21 or be flush with the rear end. When the push plate 3 pushes the part to move, the part can smoothly contact the baffle 4 and be positioned, ensuring the effectiveness and accuracy of the measurement.

[0040] It should be noted that when the shaft part 100 to be tested is placed in the placement groove 21 and is in its initial position, the end of the shaft part 100 to be tested that contacts the push plate 3 extends out of the front end face of the placement groove 21, and the contact point 61 of the linear displacement sensor 6 is flush with the end of the shaft part 100 to be tested that contacts the push plate 3. With this design, the linear displacement sensor 6 can directly use the end of the shaft part 100 to be tested as the measurement starting point.

[0041] In one embodiment, such as Figure 2 As shown, the shaft part length measuring device also includes a proximity sensor switch 7, which is positioned near the placement slot 21.

[0042] The proximity switch 7 is an inductive proximity switch of model TL-Q5MC1. The installation position of the proximity switch 7 must ensure that when the shaft part 100 to be tested is placed in the placement slot 21, the outer circular surface of the shaft part 100 to be tested is exactly within the effective detection range of the proximity switch 7.

[0043] In one embodiment, such as Figure 3 As shown, the bracket 2 has a cut 22 in the middle. When the shaft part 100 to be tested is placed in the placement groove 21, the part of the shaft part 100 to be tested located at the cut 22 is in a suspended state.

[0044] The cut 22 is located in the middle of the bracket 2 and extends along the length of the placement groove 21, with its depth extending through the thickness of the bracket 2 (i.e., from the top to the bottom of the bracket 2). The two ends of the cut 22 can be rounded to avoid the operator being scratched when picking up and placing the shaft part 100 to be tested due to the sharp angle structure, and at the same time reduce the stress concentration of the bracket 2 at this part.

[0045] In practical applications, the presence of the notch 22 allows the shaft-type part 100 to be measured to be easily placed in the placement slot 21, avoiding interference with the placement operation. Similarly, after measurement, the operator can insert their fingers into the notch 22 to easily pinch the suspended part and remove it without having to overcome the friction between the part and the placement slot 21, significantly improving the convenience of the pick-and-place operation.

[0046] In one embodiment, proximity switches 7 are arranged at both ends near the cut 22. The two proximity switches 7 are located below the bottom of the placement slot 21, that is, when the shaft part 100 to be tested is placed in the placement slot 21, the two proximity switches 7 are located below the shaft part 100 to be tested.

[0047] In one embodiment, such as Figure 3 As shown, the placement groove 21 is located on the top of the bracket 2, and the cross-section of the placement groove 21 is V-shaped.

[0048] The V-shaped placement groove 21 can automatically center shaft parts of different diameters through two support points formed by the inclined surfaces on both sides. Compared with the rectangular or semi-circular cross-section placement groove 21, the inclined surfaces on both sides of the V-shaped groove can provide a more stable constraint on the parts. During the process of the push plate 3 pushing the parts towards the baffle 4, it can effectively prevent the parts from rolling or tilting, ensuring the axial positioning accuracy of the parts. In addition, the V-shaped groove is relatively shallow, and after the parts are placed, part of their top is still exposed. Combined with the cutout 22 in the middle of the bracket 2, it is easier for operators to pick up and put down the parts.

[0049] In one embodiment, such as Figure 1 As shown, the shaft part length measuring device also includes a control box 8, a controller, a display screen 81, a switch button 82, a three-color alarm light 83, and a buzzer. The controller is located inside the control box 8, the display screen 81 and the switch button 82 are located on the front of the control box 8, the three-color alarm light 83 is located on the top of the control box 8, and the buzzer is located inside the control box 8. The linear displacement sensor 6, the display screen 81, the three-color alarm light 83, and the buzzer are electrically connected to the controller.

[0050] The controller uses an STM32F103RCT6 microcontroller, which is fixed to the inner wall of the left side of the control box 8 by copper pillars, maintaining a certain gap between the controller and the box wall to facilitate heat dissipation. The input terminals of the controller are connected to the linear displacement sensor 6, the proximity switch 7, and the switch button 82 via terminal blocks, and the output terminals are connected to the drive power component 5, the three-color alarm light 83, and the buzzer via relays.

[0051] The display screen 81 can be a touch screen or a non-touch screen. The content displayed on the display screen 81 may include real-time measurement values ​​(accurate to 0.01mm), cumulative measurement quantity, upper and lower tolerance limits, pass / fail status, and equipment operating parameters.

[0052] The switch button 82 includes a power switch, a start button, and an emergency stop button. The power switch controls the power supply to the whole machine, the start button is a self-resetting normally open contact 61 that triggers the measurement process, and the emergency stop button is connected in series in the power circuit. When pressed, it cuts off the power supply to the drive component 5 to ensure assembly safety in emergency situations.

[0053] The tri-color alarm light 83 is a tower-type alarm light, model LTE-5071, composed of red, yellow, and green LED lights. The tri-color alarm light 83 is fixed to the top of the control box 8 by threads.

[0054] The overall work process is as follows:

[0055] The operator places the shaft part 100 to be tested into the placement slot 21 at the top of the bracket 2, with the end of the part near the push plate 3 extending beyond the front end face of the placement slot 21. At this time, the proximity sensors 7 located at both ends of the cut 22 simultaneously detect the metal surface of the shaft part 100, and the output signal changes from high level to low level, transmitting the signal to the controller. After receiving the signal, the controller determines that the shaft part 100 to be tested is in place. After the controller detects that the shaft part 100 to be tested is in place, it automatically triggers the measurement process and controls the driving force 5 to work, so that the front end face of the push plate 3 contacts the protruding end of the part, pushing the shaft part 100 to be tested along the placement slot 21 towards the baffle 4. At the same time, the end of the shaft part 100 pushes the contact 61 of the linear displacement sensor 6 to move synchronously. When the other end of the shaft part 100 under test is in close contact with the baffle 4, the shaft part 100 stops moving. The linear displacement sensor 6 transmits the measured data back to the controller. After calculation, the controller obtains the length value of the shaft part 100 under test and displays it on the display screen 81 in real time. If the length value is within the specification range (the specification range is preset through the display screen 81), the three-color alarm light 83 lights up green, and the display screen 81 displays a prominent "OK" message, and the data is automatically saved. The piston rod of the push rod power component automatically retracts, and the product is manually removed to continue the next round of testing. If the measured value exceeds the specification range, the three-color alarm light 83 lights up red, the buzzer sounds, the display screen 81 displays a prominent "NG" message, and the data is automatically saved.

[0056] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A length measuring device for shaft-type parts, characterized in that, The device includes a bracket, a push plate, a baffle, a pushing power component, and a linear displacement sensor. The bracket has a placement slot with open ends. The push plate is movably disposed at the front end of the placement slot, and the baffle is fixedly disposed at the rear end of the placement slot. The pushing power component is drivenly connected to the push plate, and the contact point of the linear displacement sensor faces the push plate. When a shaft-like part to be tested is placed in the placement slot, the pushing power component drives the push plate to push the shaft-like part to be tested and the contact point of the linear displacement sensor toward the baffle until the shaft-like part to be tested contacts the baffle.

2. The length measuring device for shaft-type parts according to claim 1, characterized in that, The distance from the front end to the rear end of the placement slot is less than or equal to the length of the shaft-like part to be tested.

3. The length measuring device for shaft-type parts according to claim 1, characterized in that, When the shaft part to be tested is placed in the placement slot and is in the initial position, the end of the shaft part to be tested that is in contact with the push plate extends out of the front end face of the placement slot.

4. The length measuring device for shaft-type parts according to claim 1, characterized in that, When the shaft part to be tested is placed in the placement slot and is in the initial position, the contact point of the linear displacement sensor is flush with the end of the shaft part to be tested that contacts the push plate.

5. The length measuring device for shaft-type parts according to claim 1, characterized in that, It also includes a proximity sensor switch, which is positioned close to the placement slot.

6. The length measuring device for shaft-type parts according to claim 1, characterized in that, The bracket has a cut in the middle. When the shaft part to be tested is placed in the placement slot, the part of the shaft part to be tested located at the cut is in a suspended state.

7. The length measuring device for shaft-type parts according to claim 1, characterized in that, The placement slot is located at the top of the bracket, and the cross-section of the placement slot is V-shaped.

8. A length measuring device for shaft-type parts according to any one of claims 1-7, characterized in that, It also includes a control box, a controller, a display screen, and a switch button. The controller is located inside the control box, and the display screen and the switch button are located on the front of the control box. The linear displacement sensor and the display screen are electrically connected to the controller.

9. The length measuring device for shaft-type parts according to claim 8, characterized in that, It also includes a three-color alarm light, which is electrically connected to the controller and is located on the top of the control box.

10. The length measuring device for shaft-type parts according to claim 8, characterized in that, It also includes a buzzer, which is electrically connected to the controller and is located inside the control box.

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