Shaft part center hole length measuring device

Abstract

The invention provides a shaft part center hole length measuring device, which comprises a handle, an eccentric pull rod, an electronic depth gauge, a measuring jaw, a measuring scale, a standard cylinder, a tensioning cylinder and a tensioning screw, and is characterized in that the eccentric pull rod is arranged at the bottom of the handle along the vertical direction; the top of the handle is provided with the electronic depth gauge; the measuring jaw is arranged at one end, far away from the handle, of the eccentric pull rod; the measuring scale is provided with a central hole; the eccentric pull rod is arranged in the center hole in a penetrating manner, and the measuring jaw is used for being clamped on the lower surface of a to-be-measured part; the standard cylinder and the tensioning cylinder are both arranged on the outer side of the measuring scale in a sleeving mode, the tensioning cylinder moves along the measuring scale, and the tensioning screw penetrates through the handle in the vertical direction and is in threaded connection with the handle. The tensioning screw is used for abutting against the upper end face of the tensioning cylinder. The method has the technical effects that the length of the small-diameter center hole machined by the shaft part can be quickly and accurately measured, and the technical problem of precision measurement is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of measuring the length of a center hole of a shaft part, and in particular relates to a device for measuring the length of a center hole of a shaft part. Background Art

[0002] At present, the small diameter center hole processed in shaft parts has the characteristics of small diameter and large length. Precision measuring tools such as calipers and micrometers cannot penetrate into the small diameter center hole to accurately measure the length of the center hole. Only ordinary measuring tools such as tape measures in the existing technology can be used to penetrate into the small diameter center hole to measure the length. However, the measurement accuracy of ordinary measuring tools is limited, and there is a problem of large errors in measurement. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art and provide a new technical solution for a device for measuring the length of a center hole of a shaft part.

[0004] According to a first aspect of the present invention, there is provided a device for measuring the length of a center hole of a shaft part, comprising:

[0005] A handle, an eccentric pull rod, an electronic depth gauge and a measuring claw, wherein the bottom of the handle is provided with the eccentric pull rod in a vertical direction; the top of the handle is provided with the electronic depth gauge; and the measuring claw is provided at one end of the eccentric pull rod away from the handle;

[0006] A measuring ruler, wherein the measuring ruler is provided with a center hole; the eccentric pull rod is inserted into the center hole, and the measuring claw is used to clamp on the lower surface of the part to be measured;

[0007] A standard cylinder and a tensioning cylinder, both of which are sleeved on the outside of the measuring ruler, and the tensioning cylinder moves along the measuring ruler, and the standard cylinder is used to calibrate the measuring device;

[0008] A tensioning screw, the tensioning screw passes through the handle in a vertical direction and is threadedly connected to the handle; the tensioning screw is used to abut against the upper end surface of the tensioning cylinder;

[0009] When measuring the length of the center hole of the part to be measured, the measuring jaw extends from the lower end of the center hole of the part to be measured and then rotates 180°. By adjusting the tensioning screw, the measuring jaw is clamped on the lower end surface of the part to be measured, and the lower end surface of the tensioning cylinder is clamped on the upper end surface of the part to be measured. The vernier scale of the electronic depth gauge passes through the handle and fits the upper end surface of the tensioning cylinder. The length of the center hole of the part to be measured is obtained by taking the reading of the electronic depth gauge.

[0010] Optionally, the eccentric pull rod and the handle are fixed by a pin.

[0011] Optionally, the eccentric pull rod and the measuring claw are fixed by a pin.

[0012] Optionally, there are multiple standard cylinders, and the lengths of the standard cylinders are different.

[0013] Optionally, the number of the standard cylinders is three.

[0014] Optionally, the lengths of the three standard cylinders are 200 mm, 400 mm, and 600 mm, respectively.

[0015] Optionally, the measurement accuracy of the electronic depth gauge is 0.01 mm.

[0016] Optionally, when measuring the length of the center hole of the part to be measured, the measuring device is first calibrated using the standard cylinder, and then the length of the center hole of the part to be measured is measured after the standard cylinder is removed.

[0017] Optionally, the length of the tensioning tube is 200 mm.

[0018] Optionally, the length of the measuring ruler is greater than the sum of the lengths of the standard cylinder and the tensioning cylinder.

[0019] A technical effect of the present invention is:

[0020] In the embodiment of the present application, the device for measuring the center hole length of shaft parts can realize digital measurement of the center hole length of shaft parts, achieve large-range, high-precision and fast measurement, and fundamentally solve the technical difficulties in measuring the center hole length of shaft parts.

[0021] In addition, the center hole length measuring device for shaft parts adopts precision measurement technology, which eliminates the measurement error of ordinary measuring tools and can improve the measurement accuracy to 0.01mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a device for measuring the length of a center hole of a shaft part according to an embodiment of the present invention;

[0023] Figure 2 A reference diagram of a first use state of a device for measuring the length of a center hole of a shaft part according to an embodiment of the present invention;

[0024] Figure 3 This is a reference diagram of a second usage state of a device for measuring the center hole length of a shaft part according to an embodiment of the present invention.

[0025] In the figure: 1. handle; 2. eccentric pull rod; 3. electronic depth gauge; 31. vernier ruler;

[0026] 4. Measuring jaws; 5. Parts to be measured; 6. Standard cylinder; 7. Tensioning cylinder; 8. Tensioning screw;

[0027] 9. Measuring ruler. DETAILED DESCRIPTION

[0028] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0029] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0030] The term "first" or "second" in the specification and claims of this application may include one or more of the features explicitly or implicitly. In the description of this application, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0031] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0032] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] According to a first aspect of the present invention, see Figures 1 to 3 , provides a device for measuring the length of the center hole of a shaft part, comprising:

[0034] A handle 1, an eccentric pull rod 2, an electronic depth gauge 3 and a measuring claw 4, wherein the eccentric pull rod 2 is arranged at the bottom of the handle 1 in a vertical direction; the electronic depth gauge 3 is arranged at the top of the handle 1; and the measuring claw 4 is arranged at one end of the eccentric pull rod 2 away from the handle 1;

[0035] A measuring ruler 9, wherein the measuring ruler 9 is provided with a center hole; the eccentric pull rod 2 is inserted into the center hole, and the measuring claw 4 is used to be clamped on the lower surface of the part to be measured 5;

[0036] A standard cylinder 6 and a tensioning cylinder 7, wherein the standard cylinder 6 and the tensioning cylinder 7 are sleeved on the outside of the measuring ruler 9, and the tensioning cylinder 7 moves along the measuring ruler 9, and the standard cylinder 6 is used to calibrate the measuring device;

[0037] A tensioning screw 8, the tensioning screw 8 passes through the handle 1 in a vertical direction and is threadedly connected to the handle 1; the tensioning screw 8 is used to abut against the upper end surface of the tensioning tube 7;

[0038] When measuring the length of the center hole of the part 5 to be measured, the measuring jaw 4 extends from the lower end of the center hole of the part 5 to be measured and then rotates 180°. By adjusting the tensioning screw 8, the measuring jaw 4 is clamped on the lower end surface of the part 5 to be measured, and the lower end surface of the tensioning cylinder 7 is clamped on the upper end surface of the part 5 to be measured. The vernier scale 31 of the electronic depth gauge 3 passes through the handle 1 and fits with the upper end surface of the tensioning cylinder 7. The length of the center hole of the part 5 to be measured is obtained by taking the reading of the electronic depth gauge 3.

[0039] In the embodiment of the present application, the device for measuring the center hole length of shaft parts can realize digital measurement of the center hole length of shaft parts, achieve large-range, high-precision and fast measurement, and fundamentally solve the technical difficulties in measuring the center hole length of shaft parts.

[0040] In addition, the center hole length measuring device for shaft parts adopts precision measurement technology, which eliminates the measurement error of ordinary measuring tools and can improve the measurement accuracy to 0.01mm.

[0041] For example, the eccentric rod 2 passes through the center hole of the measuring ruler 9, and the eccentric rod 2 forms an integrated structure with the handle 1 and the measuring claw 4. The body of the electronic depth gauge 3 is fixed on the handle 1, and the vernier scale 31 passes through the handle 1 and fits the upper end surface of the tensioning cylinder 7; the tensioning screw 8 passes through the threaded through hole on the handle 1 and fits the upper end surface of the tensioning cylinder 7. The tensioning cylinder 7 and the standard cylinder 6 pass through the body of the measuring ruler 9 to form a measurement standard system.

[0042] Optionally, the eccentric pull rod 2 is fixed to the handle 1 via a pin, which makes the fixing method of the eccentric pull rod 2 and the handle 1 relatively simple.

[0043] Optionally, the eccentric pull rod 2 and the measuring claw 4 are fixed by a pin, which makes the fixing method of the eccentric pull rod 2 and the measuring claw 4 relatively simple.

[0044] Optionally, there are multiple standard cylinders 6, and the lengths of the standard cylinders 6 are different. This expands the measuring range of the device for measuring the length of the center hole of shaft parts, and is very convenient to use.

[0045] Optionally, there are three standard barrels 6. This enables rapid and accurate measurement of the length of the center hole of shaft parts.

[0046] Optionally, the lengths of the three standard cylinders 6 are 200 mm, 400 mm, and 600 mm, respectively. This makes the measuring device very convenient to use.

[0047] Optionally, the electronic depth gauge 3 has a measurement accuracy of 0.01 mm, which makes the electronic depth gauge 3 have a higher measurement accuracy and improves the accuracy of measuring the length of the center hole of shaft parts.

[0048] Optionally, when measuring the length of the center hole of the part 5 to be measured, the measuring device is first calibrated using the standard cylinder 6, and then the length of the center hole of the part 5 to be measured is measured after the standard cylinder 6 is removed. This makes it very convenient to measure the length of the center hole of shaft parts.

[0049] Optionally, the length of the tensioning tube 7 is 200 mm, which helps to quickly measure the length of the center hole of the shaft part.

[0050] Optionally, the length of the measuring ruler 9 is greater than the sum of the lengths of the standard cylinder 6 and the tensioning cylinder 7. This helps to quickly measure the length of the center hole of the shaft part, and the measuring method is relatively simple.

[0051] In a specific implementation, the design of the shaft center hole length measuring device is as follows:

[0052] The design uses a digital electronic depth gauge with a range of 200mm as the external measuring ruler 9, and the measurement accuracy of the digital electronic depth gauge can reach 0.01mm. At the same time, the length of the center hole of the shaft is divided into three length types, and the measuring device is also designed into three specifications accordingly. When measuring the length of the center hole of the shaft, the measuring device is directly selected according to the length of the center hole, and the operation process is fast. Specifically, the specifications of the measuring device are shown in Table 1.

[0053] Table 1 is the design scheme of the shaft center hole length measurement device (unit: mm)

[0054] Design Measuring device 1 Measuring device 2 Measuring device 3 Design measuring ruler 600 800 1000 Design tension cylinder 200 200 200 Design standard cylinder 200 400 600 Measurable center hole length 200-400 400-600 600-800

[0055] Specific implementation method: The measuring device is used to measure the length of the center hole of shaft parts. The measuring steps can be divided into three steps: selecting the measuring device, calibrating the standard cylinder, setting the electronic depth gauge to zero, and formal measurement.

[0056] For example: In the first step, when measuring the length of the center hole of a shaft part with a length of 377mm, select measuring device 1 in the design scheme in Table 1; in the second step, insert the 200mm standard cylinder into the measuring device, rotate the handle 180°, and the handle drives the eccentric pull rod and the measuring claw to rotate. Due to the eccentric principle, the measuring claw rotates and extends out from the lower part of the ruler body of the measuring ruler; then, tighten the tensioning screw, and the tensioning screw drives the handle, the eccentric pull rod, and the measuring claw to move upward with the support of the tensioning cylinder until the measuring claw fits tightly with the lower end face of the standard cylinder; at this time, push the lower end face of the vernier scale of the electronic depth gauge downward to fit it with the upper end face of the tensioning cylinder, and the electronic digital display ruler can be set to zero; then push the body of the electronic depth gauge upward to the top, remove the standard cylinder, and you can officially measure the length of the center hole of the shaft part.

[0057] The third step is to insert the zero-calibrated measuring device into the center hole of the shaft part to be measured, rotate the handle of the eccentric pull rod 180°, and the eccentric measuring claw extends from the lower part of the center hole of the part to be measured. Tighten the tightening screw until the measuring claw fits tightly with the lower end face of the center hole of the part to be measured; at this time, push the electronic depth gauge downward so that the lower end face of the vernier scale fits with the upper end face of the tensioning cylinder. If the electronic depth gauge shows 177.51mm, the actual length of the center hole of the shaft part to be measured is 200mm+177.51mm=377.51mm. The specific measurement diagram is as follows Figure 2 and Figure 3 shown.

[0058] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A device for measuring the length of the center hole of a shaft part, characterized in that: include: A handle, an eccentric pull rod, an electronic depth gauge and a measuring claw, wherein the bottom of the handle is provided with the eccentric pull rod in the vertical direction; the top of the handle is provided with the electronic depth gauge; and the measuring claw is provided at one end of the eccentric pull rod away from the handle; A measuring ruler, wherein the measuring ruler is provided with a center hole; the eccentric pull rod is inserted into the center hole, and the measuring claw is used to clamp on the lower surface of the part to be measured; A standard cylinder and a tensioning cylinder, both of which are sleeved on the outside of the measuring ruler, and the tensioning cylinder moves along the measuring ruler, and the standard cylinder is used to calibrate the measuring device; A tensioning screw, the tensioning screw passes through the handle in a vertical direction and is threadedly connected to the handle; the tensioning screw is used to abut against the upper end surface of the tensioning cylinder; When measuring the length of the center hole of the part to be measured, the measuring jaw extends from the lower end of the center hole of the part to be measured and then rotates 180°. By adjusting the tensioning screw, the measuring jaw is clamped on the lower end surface of the part to be measured, and the lower end surface of the tensioning cylinder is clamped on the upper end surface of the part to be measured. The vernier scale of the electronic depth gauge passes through the handle and fits the upper end surface of the tensioning cylinder. The length of the center hole of the part to be measured is obtained by taking the reading of the electronic depth gauge.

2. The device for measuring the length of the center hole of shaft parts according to claim 1, characterized in that: The eccentric pull rod and the handle are fixed by a pin.

3. The device for measuring the length of the center hole of shaft parts according to claim 1, characterized in that: The eccentric pull rod and the measuring claw are fixed by a pin.

4. The device for measuring the length of the center hole of a shaft part according to claim 1, characterized in that: There are multiple standard cylinders, and the lengths of the standard cylinders are different.

5. The device for measuring the length of the center hole of shaft parts according to claim 4, characterized in that: The number of the standard cylinders is three.

6. The device for measuring the length of the center hole of a shaft part according to claim 5, characterized in that: The lengths of the three standard cylinders are 200 mm, 400 mm, and 600 mm respectively.

7. The device for measuring the length of the center hole of a shaft part according to claim 1, characterized in that: The measuring accuracy of the electronic depth gauge is 0.01 mm.

8. The device for measuring the length of the center hole of a shaft part according to claim 1, characterized in that: When measuring the length of the center hole of the part to be measured, the measuring device is first calibrated using the standard cylinder, and then the length of the center hole of the part to be measured is measured after the standard cylinder is removed.

9. The device for measuring the length of the center hole of a shaft part according to claim 1, characterized in that: The length of the tensioning tube is 200 mm.

10. The device for measuring the length of the center hole of a shaft part according to claim 1, characterized in that: The length of the measuring ruler is greater than the sum of the lengths of the standard cylinder and the tensioning cylinder.

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