A vernier caliper constant force measurement auxiliary device and a constant force measuring vernier caliper

Abstract

This utility model discloses a constant force measurement auxiliary device for vernier calipers and a constant force measuring vernier caliper, including a main body base, a sliding component, and a constant force component. The main body base includes a side plate, an upper sliding groove block, a lower sliding groove block, a main scale mounting groove, an upper sliding groove, and a lower sliding groove. The sliding component includes an upper sliding rod and a lower sliding rod, and the constant force component includes an upper compression spring sleeved between the upper sliding rod and the upper sliding groove and a lower compression spring sleeved between the lower sliding rod and the lower sliding groove. This utility model provides a constant force measurement auxiliary device for vernier calipers and a constant force measuring vernier caliper. By setting up a main body base, a sliding component, and a constant force component, and using the elastic force of a spring mechanism to replace manual clamping force, it can avoid the problem of measurement errors caused by slight deformation or insufficient contact of the workpiece due to inappropriate clamping force when measuring flexible or thin-walled workpieces.

Description

Technical Field

[0001] This utility model relates to the field of positioning and detection tools, specifically to a vernier caliper constant force measurement auxiliary device and a constant force measuring vernier caliper. Background Technology

[0002] In the field of precision measurement, conventional vernier calipers are widely used in machining, product quality inspection, and other scenarios due to their simple structure, low cost, and intuitive readings. However, the measurement operation of conventional vernier calipers relies on manual application of clamping force—different operators have different hand strengths, and even the same operator's strength may fluctuate at different times of measurement, resulting in inconsistent contact pressure between the caliper's measuring jaws and the workpiece being measured.

[0003] This inconsistency in clamping force leads to two major problems: First, for flexible or thin-walled workpieces, excessive clamping force may cause slight deformation, while insufficient force may result in gaps due to inadequate contact; both contribute to measurement errors. Second, the repeatability of multiple measurements of the same workpiece is poor, affecting data reliability. Currently, the main solution to this problem is to use electronic digital calipers with built-in constant force mechanisms. However, these calipers are expensive and incompatible with the conventional vernier calipers already widely used by enterprises, resulting in high equipment upgrade costs and wasted resources. Therefore, there is an urgent need for an auxiliary device that can be used with conventional vernier calipers, has a simple structure, is low in cost, and can accurately calibrate the clamping force to overcome the shortcomings of existing technologies. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a constant force measurement auxiliary device for vernier calipers and a constant force measuring vernier caliper, so as to solve the problem of large measurement errors caused by unsuitable clamping force due to manual operation of vernier calipers in the existing technology.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a vernier caliper constant force measurement auxiliary device, including a device main body, a sliding component installed in the device main body, and a constant force component installed between the sliding component and the device main body.

[0006] The main body of the device includes a side plate, an upper sliding groove block installed parallel to one end face of the side plate, and a lower sliding groove block installed parallel to the other end face of the side plate.

[0007] The sides of the upper sliding block and the lower sliding block are both higher than the sides of the side plate, and a main scale mounting groove is formed between the upper sliding block, the side plate and the lower sliding block.

[0008] The upper sliding block and the lower sliding block are further provided with upper sliding grooves and lower sliding grooves along their own length direction. The upper sliding groove and the lower sliding groove are both cylindrical through grooves.

[0009] The sliding assembly includes an upper sliding rod passing through an upper sliding groove and a lower sliding rod passing through a lower sliding groove. One end of the upper sliding rod extends out of the upper sliding groove, and one end of the lower sliding rod extends out of the lower sliding groove.

[0010] The end of the upper sliding rod that extends out of the upper sliding groove and the end of the lower sliding rod that extends out of the lower sliding groove are located on the same side of the main body of the device.

[0011] The constant force assembly includes an upper compression spring sleeved between the upper sliding rod and the upper sliding groove, and a lower compression spring sleeved between the lower sliding rod and the lower sliding groove.

[0012] This utility model also has the following technical features:

[0013] An upper notch is provided on one side of the top surface of the upper sliding block, and part of the length of the upper sliding groove is located within the upper notch.

[0014] A lower notch is provided on one side of the top surface of the sliding groove block, and part of the length of the sliding groove is located within the lower notch.

[0015] The lower and upper notches are arranged symmetrically.

[0016] The upper sliding rod includes an upper auxiliary shaft, an upper limit shaft, and an upper spring mounting shaft connected in sequence. The radius of the upper auxiliary shaft is larger than the radius of the upper spring mounting shaft, and the radius of the upper limit shaft is larger than the radius of the upper auxiliary shaft.

[0017] The upper auxiliary shaft extends out of the upper sliding groove, and the upper limit positioning shaft is located inside the upper sliding groove.

[0018] The lower sliding rod includes a lower auxiliary shaft, a lower limit shaft, and a lower spring mounting shaft connected in sequence. The structure of the lower sliding rod is the same as that of the upper sliding rod.

[0019] The radius of the lower auxiliary shaft is greater than the radius of the lower spring mounting shaft, and the radius of the lower limit shaft is greater than the radius of the lower auxiliary shaft.

[0020] The lower auxiliary shaft extends out of the lower sliding groove, and the lower limit shaft is located inside the lower sliding groove.

[0021] The vernier caliper constant force measurement auxiliary device also includes a positioning component.

[0022] The positioning component includes an upper stop block mounted on the upper notch and a lower stop block mounted on the lower notch.

[0023] The positioning component further includes an upper limit step arranged on the inner wall of the upper slide groove and a lower limit step arranged on the inner wall of the lower slide groove.

[0024] The upper limit axis is located between the upper limit step and the upper stop block, and the lower limit axis is located between the lower limit step and the lower stop block.

[0025] The upper compression spring is sleeved on the upper spring mounting shaft. One end of the upper compression spring contacts the upper limit shaft, and the other end contacts the upper stop block.

[0026] The lower compression spring is sleeved on the lower spring mounting shaft, with one end of the lower compression spring contacting the lower limit shaft and the other end contacting the lower stop block.

[0027] The vernier caliper constant force measuring auxiliary device also includes an indicating component, which includes:

[0028] An upper cover plate is installed on the side of the upper sliding block facing away from the side plate. The upper cover plate is generally rectangular in shape, with a notch at one corner corresponding to the shape of the notch. A scale line is also arranged at the notch of the upper cover plate.

[0029] The lower cover plate is installed on the side of the sliding groove block facing away from the side plate. The lower cover plate is generally rectangular in shape, with a notch at one corner, corresponding to the shape of the lower notch.

[0030] An indicator is installed on the upper spring mounting shaft, extending from the upper notch, and the indicator mates with the force scale line.

[0031] This utility model also provides a constant force measuring vernier caliper, including a vernier caliper and a vernier caliper constant force measuring auxiliary device as described above.

[0032] The vernier caliper constant force measurement auxiliary device is installed on one side of the back vector claw on the main scale of the vernier caliper.

[0033] The upper and lower sliding rods are oriented towards the vernier scale.

[0034] Compared with the prior art, this utility model has the following technical effects:

[0035] (I) The present invention provides a vernier caliper constant force measurement auxiliary device and a constant force measuring vernier caliper. By setting up a main body base, a sliding component and a constant force component, the elastic force of the spring mechanism replaces the manual clamping force, which can avoid the problem of measurement error caused by the slight deformation of the workpiece or insufficient contact when the clamping force is unsuitable for flexible or thin-walled workpieces.

[0036] (II) The vernier caliper constant force measurement auxiliary device and constant force measurement vernier caliper provided by this utility model, by setting an indicator component, realizes constant calibration of clamping force during measurement, reduces the cost of use, avoids the problem of poor accuracy caused by the difference in force of different operators and different measurement periods, ensures the consistency of measurement accuracy, and significantly improves the repeatability and accuracy of measurement results.

[0037] (III) The vernier caliper constant force measurement auxiliary device provided by this utility model has a compact structure and is easy to assemble. It can be directly used with conventional vernier calipers without modifying the original calipers. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the overall structure of the vernier caliper constant force measuring auxiliary device of this utility model. Figure I .

[0039] Figure 2 This is a schematic diagram of the overall structure of the vernier caliper constant force measuring auxiliary device of this utility model. Figure II .

[0040] Figure 3 This is a cross-sectional structural schematic diagram of the vernier caliper constant force measurement auxiliary device of this utility model.

[0041] Figure 4 This is a schematic diagram of the main body of the device.

[0042] Figure 5 This is a schematic diagram of the upper sliding rod.

[0043] Figure 6 This is a schematic diagram of the upper cover plate.

[0044] Figure 7 This is a schematic diagram of the upper stop block.

[0045] Figure 8 This is a schematic diagram of the lower stop block.

[0046] Figure 9 This is a structural schematic diagram of the indicator.

[0047] Figure 10 Schematic diagram of the overall structure of a constant force measuring vernier caliper Figure I .

[0048] Figure 11 Schematic diagram of the overall structure of a constant force measuring vernier caliper Figure II .

[0049] The meanings of the labels in the attached diagram are as follows:

[0050] 1-Main body of the device, 2-Sliding assembly, 3-Constant force assembly, 4-Positioning assembly, 5-Indicating assembly, 6-Main scale, 7-Measuring jaw, 8-Vernier scale, 9-Locking screw.

[0051] 1-1-Side plate, 1-2-Upper sliding groove block, 1-3-Lower sliding groove block, 1-4-Main scale mounting groove, 1-5-Upper sliding groove, 1-6-Lower sliding groove, 1-7-Upper notch, 1-8-Lower notch.

[0052] 2-1-Upper sliding rod, 2-2-Lower sliding rod.

[0053] 3-1-Upper compression spring, 3-2-Lower compression spring.

[0054] 4-1-Upper stop block, 4-2-Lower stop block, 4-3-Upper limit step, 4-4-Lower limit step.

[0055] 5-1-Upper cover plate, 5-2-Force scale line, 5-3-Lower cover plate, 5-4-Indicator.

[0056] 2-1-1-Upper auxiliary shaft, 2-1-2-Upper limit shaft, 2-1-3-Upper spring mounting shaft, 2-1-4 Threaded mounting hole.

[0057] 2-2-1-Lower auxiliary shaft, 2-2-2-Lower limit shaft, 2-2-3-Lower spring mounting shaft.

[0058] The specific content of this utility model will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0059] Unless otherwise specified, all components in this invention are made from components known in the prior art.

[0060] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0061] Example 1:

[0062] This embodiment provides an auxiliary device for constant force measurement with vernier calipers, such as... Figure 1 As shown, it includes a device main body 1, a sliding component 2 installed in the device main body 1, and a constant force component 3 installed between the sliding component 2 and the device main body 1.

[0063] In this application, such as Figure 4 As shown, the main body 1 of the device is a one-piece structure. It is broken down into components for easier description of the structure:

[0064] The main body 1 of the device includes a side plate 1-1, an upper sliding groove block 1-2 that is installed parallel to one end face of the side plate 1-1, and a lower sliding groove block 1-3 that is installed parallel to the other end face of the side plate 1-1.

[0065] The sides of the upper sliding block 1-2 and the lower sliding block 1-3 are both higher than the side of the side plate 1-1, and the upper sliding block 1-2, the side plate 1-1 and the lower sliding block 1-3 form a main scale mounting groove 1-4.

[0066] The upper sliding block 1-2 and the lower sliding block 1-3 are further provided with an upper sliding groove 1-5 and a lower sliding groove 1-6 along their own length direction. The upper sliding groove 1-5 and the lower sliding groove 1-6 are both cylindrical through grooves.

[0067] The sliding component 2 includes an upper sliding rod 2-1 passing through the upper sliding groove 1-5 and a lower sliding rod 2-2 passing through the lower sliding groove 1-6. One end of the upper sliding rod 2-1 extends out of the upper sliding groove 1-5, and one end of the lower sliding rod 2-2 extends out of the lower sliding groove 1-6.

[0068] The end of the upper sliding rod 2-1 that protrudes from the upper sliding groove 1-5 and the end of the lower sliding rod 2-2 that protrudes from the lower sliding groove 1-6 are located on the same side of the main body seat 1 of the device.

[0069] The constant force component 3 includes an upper compression spring 3-1 sleeved between the upper sliding rod 2-1 and the upper sliding groove 1-5, and a lower compression spring 3-2 sleeved between the lower sliding rod 2-2 and the lower sliding groove 1-6.

[0070] During installation, the main body 1 of the device is fitted onto the side of the main scale 6 of the vernier caliper facing away from the vector claw 7. The main scale 6 is located in the main scale mounting groove 1-4. One end of the upper sliding rod 2-1 protruding from the upper sliding groove 1-5 and the other end of the lower sliding rod 2-2 protruding from the lower sliding groove 1-6 face the vernier scale 8 of the vernier caliper.

[0071] In use, push the main body 1 of the device so that the upper sliding rod 2-1 and the lower sliding rod 2-2 contact the vernier scale 8 of the vernier caliper. Continue to slowly push the main body 1 of the device to begin applying the measuring clamping force. The upper sliding rod 2-1 and the lower sliding rod 2-2 are pushed by the reaction force of the workpiece to be measured, compressing the upper compression spring 3-1 and the lower compression spring 3-2. At this time, tighten the locking screw and take the reading.

[0072] This application uses a device main body 1, a sliding component 2 and a constant force component 3 in combination. The upper sliding rod 2-1 and the lower sliding rod 2-2 of the sliding component 2 are used to replace the manual pushing of the vernier scale 8. The upper compression spring 3-1 and the lower compression spring 3-2 of the constant force component 3 are compressed and subjected to force, which avoids the measurement error caused by the slight deformation of the workpiece or insufficient contact due to the inappropriate clamping force when targeting flexible or thin-walled workpieces.

[0073] As a preferred embodiment:

[0074] like Figures 1-4 As shown, an upper notch 1-7 is provided on one side of the top surface of the upper sliding block 1-2, and part of the length of the upper sliding groove 1-5 is located within the upper notch 1-7.

[0075] A lower notch 1-8 is provided on one side of the top surface of the sliding groove block 1-3, and part of the length of the sliding groove 1-6 is located within the lower notch 1-8.

[0076] The lower notch 1-8 and the upper notch 1-7 are arranged symmetrically.

[0077] Locking screws are also installed at the lower notches 1-8. The principle and structure of the locking screws here are the same as those on ordinary vernier calipers.

[0078] As a preferred embodiment:

[0079] like Figure 3 and Figure 5 As shown, the upper sliding rod 2-1 includes an upper auxiliary shaft 2-1-1, an upper limit shaft 2-1-2, and an upper spring mounting shaft 2-1-3 connected in sequence. The radius of the upper auxiliary shaft 2-1-1 is larger than the radius of the upper spring mounting shaft 2-1-3, and the radius of the upper limit shaft 2-1-2 is larger than the radius of the upper auxiliary shaft 2-1-1.

[0080] The upper auxiliary shaft 2-1-1 extends out of the upper sliding groove 1-5, and the upper limit positioning shaft 2-1-2 is located inside the upper sliding groove 1-5.

[0081] The lower sliding rod 2-2 includes a lower auxiliary shaft 2-2-1, a lower limit shaft 2-2-2, and a lower spring mounting shaft 2-2-3 connected in sequence. The radius of the lower auxiliary shaft 2-2-1 is larger than the radius of the lower spring mounting shaft 2-2-3, and the radius of the lower limit shaft 2-2-2 is larger than the radius of the lower auxiliary shaft.

[0082] The lower auxiliary shaft 2-2-1 extends out of the lower sliding groove 1-6, and the lower limiting shaft 2-2-2 is located inside the lower sliding groove 1-6.

[0083] The structure of the lower sliding rod 2-2 is the same as that of the upper sliding rod 2-1.

[0084] As a preferred embodiment:

[0085] like Figure 1 , Figure 2 and Figure 6 As shown, the vernier caliper constant force measurement auxiliary device also includes a positioning component 4.

[0086] The positioning component 4 includes an upper stop block 4-1 installed on the upper notch 1-7 and a lower stop block 4-2 installed on the lower notch 1-8.

[0087] The positioning component 4 further includes an upper limit step 4-3 arranged on the inner wall of the upper slide groove 1-5 and a lower limit step 4-4 arranged on the inner wall of the lower slide groove 1-6.

[0088] The upper limit axis 2-1-2 is located between the upper limit step 4-3 and the upper stop block 4-1, and the lower limit axis is located between the lower limit step 4-4 and the lower stop block 4-2.

[0089] The upper compression spring 3-1 is sleeved on the upper spring mounting shaft 2-1-3. One end of the upper compression spring 3-1 is in contact with the upper limit shaft 2-1-2, and the other end is in contact with the upper stop block 4-1. The upper limit shaft 2-1-2 and the upper stop block 4-1 together form a limit on the upper compression spring 3-1.

[0090] The lower compression spring 3-2 is sleeved on the lower spring mounting shaft. One end of the lower compression spring 3-2 contacts the lower limit shaft 2-2-2, and the other end contacts the lower stop block 4-2. The lower limit shaft 2-2-2 and the lower stop block 4-2 together form a limit on the lower compression spring 3-2.

[0091] The upper stop block 4-1 and the lower stop block 4-2 are each provided with a semi-cylindrical groove, which cooperates with the upper sliding groove 1-5 and the lower sliding groove 1-6 respectively.

[0092] The upper stop block 4-1 can also serve as a push block. When in use, the upper stop block 4-1 can be pushed directly by hand to move the main body 1 of the device.

[0093] like Figure 3 As shown, taking the upper sliding rod 2-1 as an example, when no force is applied, the upper limit shaft 2-1-2 contacts the upper limit step 4-3, and the right end face of the upper spring mounting shaft 2-1-3 is flush with the right end face of the upper stop block 4-1.

[0094] As a preferred embodiment:

[0095] like Figure 1 , Figure 2 , Figure 6 and Figure 9 As shown, the vernier caliper constant force measuring auxiliary device also includes an indicating component 5, which includes:

[0096] An upper cover plate 5-1 is installed on the side of the upper sliding block 1-2 facing away from the side plate 1-1. The upper cover plate 5-1 is generally rectangular in shape. There is a notch at one corner of the upper cover plate 5-1, which corresponds to the shape of the upper notch 1-7. A scale line 5-2 is also arranged at the notch of the upper cover plate 5-1.

[0097] The lower cover plate 5-3 is installed on the side of the sliding groove block 1-3 facing away from the side plate 1-1. The lower cover plate 5-3 is generally rectangular in shape, and there is a notch at one corner of the lower cover plate 5-3, which corresponds to the shape of the lower notch 1-8.

[0098] An indicator 5-4 is installed on the upper spring mounting shaft 2-1-3, extending a section from the upper notch 1-7. The indicator 5-4 is engaged with the force scale line 5-2.

[0099] In this application, the force scale line 5-2 has graduations of 2, 4, 6, and 8 N, corresponding to different compression amounts of the upper compression spring 3-1 and the lower compression spring 3-2. The spacing between the scale lines is set according to the elastic coefficients of the upper compression spring 3-1 and the lower compression spring 3-2. Figure 3 As shown, the indicator 5-4 is threadedly installed in the threaded mounting hole 2-1-4 at the right end of the upper sliding rod 2-1, and slides axially synchronously with the upper sliding rod 2-1. Furthermore, the lower cover plate 5-3 is identical to the upper cover plate 5-1 except for the force scale line 5-2.

[0100] When the pointer of indicator 5-4 aligns with the required standard clamping force scale, for example, set to 2N, stop pushing the upper stop 4-1. At this time, the elastic force of the upper spring 3-1 and the lower spring 3-2 is the calibrated clamping force, and the fastening screw is tightened. This avoids the problem of poor accuracy caused by the difference in force from different operators and at different measurement times, and significantly improves the repeatability and accuracy of the measurement results.

[0101] like Figure 1 and Figure 2 As shown, the edges of the upper cover plate 5-1 facing away from the notch and the lower cover plate 5-3 facing away from the notch extend a certain distance beyond the edges of the upper sliding block 1-2 and the lower sliding block 1-3. When assembled and used, this can better restrict the position of the main scale 6.

[0102] As a preferred embodiment:

[0103] The vernier caliper constant force measurement auxiliary device also includes a fastening component.

[0104] like Figure 4 As shown, the upper sliding block 1-2 and the lower sliding block 1-3 have multiple threaded holes on their front sides for fixing the upper cover plate 5-1 and the lower cover plate 5-3. The upper cover plate 5-1 and the lower cover plate 5-3 also have holes at corresponding positions.

[0105] like Figure 4 As shown, a threaded hole is provided at the upper notch 1-7 position for installing the upper stop 4-1, and a threaded hole is provided at the lower notch 1-8 position for installing the lower stop 4-2.

[0106] like Figure 4As shown, the upper side of the sliding groove block 1-3 has multiple threaded through holes. The two threaded through holes on the left are fitted with slotted flat-end set screws to eliminate the gap between the main body 1 of the device and the lower surface of the vernier caliper main scale 6. The one on the right is engaged with the fastening screw to lock the main body 1 of the device.

[0107] Example 2:

[0108] A constant force measuring vernier caliper, such as Figures 10-11 As shown, it includes a vernier caliper and a vernier caliper constant force measurement auxiliary device as described in Example 1.

[0109] The vernier caliper constant force measuring auxiliary device is installed on one side of the back vector claw 7 on the main scale 6 of the vernier caliper; the upper sliding rod 2-1 and the lower sliding rod 2-2 face the vernier scale 8.

[0110] The assembly steps are as follows;

[0111] (I) Assembly of sliding rod and stop block:

[0112] The upper compression spring 3-1 is fitted onto the upper spring mounting shaft 2-1-3 of the upper sliding rod 2-1. The upper sliding rod 2-1 is then inserted through the upper notch 1-7 above the main body seat 1, and the upper stop block 4-1 is installed. The right end of the upper compression spring 3-1 contacts the left end of the upper stop block 4-1. At this point, the right end face of the upper sliding rod 2-1 is flush with the right end face of the upper stop block 4-1. The assembly of the lower sliding rod 2-2, lower compression spring 3-2, and lower stop block 4-2 is similar and will not be described further. Figure 3 As shown.

[0113] (II) Assembly of main body and cover plate:

[0114] Fit the main body 1 of the device onto the scale of the vernier caliper, ensuring the surface of the main scale 6 of the vernier caliper aligns with the main scale mounting groove 1-4 of the main body 1. Secure the upper cover plate 5-1 to the upper sliding block 1-2 using three slotted large cylindrical head screws, paying attention to the tightness of the fit between the main body 1 and the main scale 6 to ensure smooth sliding of the main body 1 on the vernier caliper. Similarly, secure the lower cover plate 5-3 to the lower sliding block 1-3 using three slotted large cylindrical head screws. Then, install two slotted flat-end set screws in the two threaded through holes on the left side of the upper side of the lower sliding block 1-3, and install a fastening screw in the one threaded through hole on the right side of the upper side of the lower sliding block 1-3, ensuring the three screws are in slight contact with the lower surface of the main scale 6. Figure 4 As shown.

[0115] (III) Assembly of indicator components:

[0116] Secure the indicator 5-4 to the right end of the upper sliding rod 2-1 using slotted large cylindrical head screws and threaded holes, ensuring that the pointer of the indicator 5-4 points towards the force scale line 5-2 on the upper cover plate 5-1. Note that a small gap may be left between the contact surface of the indicator 5-4 and the upper cover plate 5-1, or lubricant may be applied to prevent the upper sliding rod 2-1 from being obstructed when sliding with the indicator 5-4.

[0117] The specific usage method is as follows:

[0118] (I) Workpiece positioning: Place the workpiece to be measured between the jaws 7 of the vernier caliper, hold the main scale 6 of the vernier caliper, and slowly push the vernier scale 8 so that the jaws 7 make slight contact with the workpiece.

[0119] (II) Constant Force Clamping: Push the upper stop 4-1 from right to left, so that the upper sliding rod 2-1 and lower sliding rod 2-2 of the main body 1 of the device contact the vernier scale 8. Continue to slowly push the upper stop 4-1 to begin applying the measuring clamping force. The upper sliding rod 2-1 and lower sliding rod 2-2 are pushed by the reaction force of the workpiece, compressing the upper compression spring 3-1 and lower compression spring 3-2. At the same time, the upper sliding rod 2-1 drives the indicator 5-4 to move to the right. When the pointer of the indicator 5-4 is aligned with the required standard clamping force scale, stop pushing the upper stop 4-1. At this time, the elastic force of the upper compression spring 3-1 and lower compression spring 3-2 is the calibrated clamping force. At the same time, tighten the locking screw 9.

[0120] (III) Reading record: Keep the indicator 5-4 aligned with the standard scale, read the scale value of the vernier caliper, and complete one measurement; when repeating the measurement, simply push the main body 1 of the device again until the indicator is aligned with the standard scale to ensure that the clamping force is consistent each time.

[0121] This utility model discloses a constant force measurement auxiliary device for vernier calipers. Through a simple mechanical structure, it realizes the "constant force clamping" function, which not only solves the problem of human clamping force error in conventional vernier calipers, but also takes into account compatibility and low cost. It is especially suitable for small and medium-sized manufacturing enterprises, quality inspection laboratories and other scenarios that require both measurement accuracy and cost control.

[0122] The above technical solutions are only preferred embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be conceived by those skilled in the art without creative effort within the technical scope disclosed in this utility model are covered within the protection scope of this utility model.

Claims

1. A vernier caliper constant force measuring aid, characterized by, It includes a main body base (1), a sliding assembly (2) installed in the main body base (1), and a constant force assembly (3) installed between the sliding assembly (2) and the main body base (1). The main body of the device (1) includes a side plate (1-1), an upper sliding groove block (1-2) installed parallel to one end face of the side plate (1-1), and a lower sliding groove block (1-3) installed parallel to the other end face of the side plate (1-1). The sides of the upper sliding block (1-2) and the lower sliding block (1-3) are both higher than the side of the side plate (1-1), and a main scale mounting groove (1-4) is formed between the upper sliding block (1-2), the side plate (1-1) and the lower sliding block (1-3). The upper sliding block (1-2) and the lower sliding block (1-3) are further provided with an upper sliding groove (1-5) and a lower sliding groove (1-6) along their own length direction. The upper sliding groove (1-5) and the lower sliding groove (1-6) are both cylindrical through grooves. The sliding assembly (2) includes an upper sliding rod (2-1) passing through the upper sliding groove (1-5) and a lower sliding rod (2-2) passing through the lower sliding groove (1-6). One end of the upper sliding rod (2-1) extends out of the upper sliding groove (1-5), and one end of the lower sliding rod (2-2) extends out of the lower sliding groove (1-6). The end of the upper sliding rod (2-1) that protrudes from the upper sliding groove (1-5) and the end of the lower sliding rod (2-2) that protrudes from the lower sliding groove (1-6) are located on the same side of the main body base (1) of the device; The constant force component (3) includes an upper compression spring (3-1) sleeved between the upper sliding rod (2-1) and the upper sliding groove (1-5) and a lower compression spring (3-2) sleeved between the lower sliding rod (2-2) and the lower sliding groove (1-6).

2. The vernier caliper constant force measuring aid of claim 1, wherein, The upper sliding block (1-2) has an upper notch (1-7) on one side of its top surface, and part of the length of the upper sliding groove (1-5) is located within the upper notch (1-7); A lower notch (1-8) is opened on one side of the top surface of the sliding groove block (1-3), and part of the length of the sliding groove (1-6) is located within the lower notch (1-8); The lower notch (1-8) and the upper notch (1-7) are arranged symmetrically.

3. The vernier caliper constant force measuring aid of claim 2, wherein, The upper sliding rod (2-1) includes an upper auxiliary shaft (2-1-1), an upper limit shaft (2-1-2), and an upper spring mounting shaft (2-1-3) connected in sequence. The radius of the upper auxiliary shaft (2-1-1) is larger than the radius of the upper spring mounting shaft (2-1-3), and the radius of the upper limit shaft (2-1-2) is larger than the radius of the upper auxiliary shaft (2-1-1). The upper auxiliary shaft (2-1-1) extends out of the upper sliding groove (1-5), and the upper limit shaft (2-1-2) is located inside the upper sliding groove (1-5); The lower sliding rod (2-2) includes a lower auxiliary shaft, a lower limit shaft and a lower spring mounting shaft connected in sequence. The structure of the lower sliding rod (2-2) is the same as that of the upper sliding rod (2-1).

4. The vernier caliper constant force measuring auxiliary device as described in claim 3, characterized in that, The vernier caliper constant force measurement auxiliary device also includes a positioning component (4); The positioning component (4) includes an upper stop block (4-1) installed on the upper notch (1-7) and a lower stop block (4-2) installed on the lower notch (1-8). The positioning component (4) further includes an upper limit step (4-3) arranged on the inner wall of the upper slide groove (1-5) and a lower limit step (4-4) arranged on the inner wall of the lower slide groove (1-6). The upper limit axis (2-1-2) is located between the upper limit step (4-3) and the upper stop block (4-1), and the lower limit axis is located between the lower limit step (4-4) and the lower stop block (4-2). The upper compression spring (3-1) is sleeved on the upper spring mounting shaft (2-1-3). One end of the upper compression spring (3-1) is in contact with the upper limit shaft (2-1-2), and the other end is in contact with the upper stop block (4-1). The lower compression spring (3-2) is sleeved on the lower spring mounting shaft. One end of the lower compression spring (3-2) is in contact with the lower limit shaft, and the other end is in contact with the lower stop block (4-2).

5. The vernier caliper constant force measuring auxiliary device as described in claim 4, characterized in that, The vernier caliper constant force measuring auxiliary device also includes an indicating component (5), which includes: An upper cover plate (5-1) is installed on the side of the upper sliding block (1-2) facing away from the side plate (1-1). The upper cover plate (5-1) is generally rectangular in shape. There is a notch at one corner of the upper cover plate (5-1), which corresponds to the shape of the upper notch (1-7). A scale line (5-2) is also arranged at the notch of the upper cover plate (5-1). The lower cover plate (5-3) is installed on the side of the sliding groove block (1-3) facing away from the side plate (1-1). The lower cover plate (5-3) is generally rectangular in shape, and there is a notch at one corner of the lower cover plate (5-3), which corresponds to the shape of the lower notch (1-8). An indicator (5-4) is installed on the upper spring mounting shaft (2-1-3) extending out of the upper notch (1-7), and the indicator (5-4) is engaged with the force scale line (5-2).

6. A constant force measuring vernier caliper, comprising a vernier caliper, characterized in that, It also includes the vernier caliper constant force measurement auxiliary device as described in any one of claims 1-5; The vernier caliper constant force measuring auxiliary device is installed on one side of the back vector claw (7) on the main scale (6) of the vernier caliper. The upper sliding rod (2-1) and the lower sliding rod (2-2) extend out of the upper sliding groove (1-5) and the lower sliding groove (1-6) towards the vernier scale (8).

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