Special measuring tool for measuring aperture short step of belt pulley

Abstract

The utility model discloses a special measuring tool for measuring a short step of an aperture of a belt pulley, belongs to the technical field of measuring tools, and solves the problem that the existing measuring tool is in surface contact with a step surface of a measured inner hole, so that errors are easy to occur, and the measurement output is inaccurate. The special measuring tool for measuring the aperture short step of the belt pulley comprises a measuring support and a dial indicator, the measuring support is provided with a hollow cavity, the measuring support is provided with a through hole at the bottom of the hollow cavity, a sleeve of the dial indicator is movably inserted in the through hole, the end face of one side of the bottom of the measuring support is provided with a first threaded hole, and the end face of the other side of the bottom of the measuring support is provided with a second threaded hole. A first threaded hole is formed in the measuring support and communicated with the through hole, a fastening bolt used for fixing a dial indicator is connected into the first threaded hole in a threaded mode, a height-adjustable measuring block is arranged at the top of the measuring support, and a U-shaped groove is formed in the top of the measuring block. The special measuring tool for measuring the short step of the aperture of the belt pulley is high in measuring accuracy.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of measuring tools, more specifically, it relates to a special measuring tool for measuring the short step of the hole diameter of a belt pulley. BACKGROUND

[0002] In the modern mechanical industry, many products have different tools and methods for measurement according to their structures. Since the steps are very small, such steps are often set in the inner hole of the belt pulley, and the measuring rod of the dial gauge cannot be inserted into the step, so it is impossible to measure the step in the inner hole of the belt pulley. Moreover, the precision of such inner holes is often very high, and the general calipers cannot guarantee the measurement accuracy, which leads to the difficulty or impossibility of installing the processed products, resulting in the scrapping of parts, reducing the qualified rate of products, and affecting the delivery time of products, causing serious economic losses.

[0003] After searching, it is found that the application number CN201310505340.5 is a step hole diameter measuring method, which uses a standard inner diameter dial gauge, and the standard inner diameter dial gauge is disassembled, and the fixed hole at the measuring head and the table rod are used to install special accessories for measurement. The special accessories include a support, a measuring rod, a pull rod, a pull rod sleeve, a fixing sleeve and a pressing plate. The support is installed at the position after the disassembly of the replaceable measuring head of the standard inner diameter dial gauge. The lower end of the measuring rod is movably connected to the support. The fixing sleeve and the pressing plate are connected and fixedly installed in the rear part of the standard inner diameter dial gauge table rod. The tail end of the pull rod sleeve is connected with the fixing sleeve and corresponds to the position of the measuring rod. The front end of the pull rod is movably connected with the measuring rod, and the rear end is connected with the pull rod sleeve. The tail end of the pull rod can move forward and backward in the pull rod sleeve. The replaceable measuring head disassembled from the standard inner diameter dial gauge or selected is connected with the upper end of the measuring rod. However, the support and the inner hole of the measured part are in surface contact during measurement, the friction is large, and the measurement data may be inaccurate due to excessive force during measurement. Moreover, the operation of the device is relatively complex. UTILITY MODEL CONTENT

[0004] The utility model solves the above problems of the prior art and provides a special measuring tool for measuring the short step of the hole diameter of a belt pulley. The tool is easy to operate, has high measurement accuracy, improves the qualified rate of products, and has a wide range of applications.

[0005] The utility model discloses a technical scheme is such: a kind of special gauge for pulley aperture short step measurement, including measuring support, dial gauge, the hollow cavity of being equipped with on the measuring support, the bottom of hollow cavity on the measuring support is equipped with through-hole, the sleeve of dial gauge is movably inserted in through-hole, the end face of one side of measuring support bottom is equipped with first threaded hole, the first threaded hole is communicated with through-hole, the first threaded hole is screw-connected with the fastening bolt for fixed dial gauge, the top of measuring support is equipped with height adjustable measuring block, the top of measuring block is equipped with U-shaped groove, one end of U-shaped groove extends to the end face of measuring block, steel ball is movably placed in the U-shaped groove.

[0006] As further improvement, the central axis of the through hole and the central axis of the threaded hole are in the same plane and perpendicular to each other.

[0007] Further, the fastening bolt is made of plastic material.

[0008] Further, the bottom of the fastening bolt is provided with a first arc surface, and the first arc surface is adapted to the circumferential surface of the dial sleeve.

[0009] Further, both sides of the measuring support are provided with a lead screw threadedly connected with the measuring support, one end of the lead screw located in the hollow cavity is rotatably connected with a clamping plate, the two clamping plates are located on both sides of the dial gauge respectively, the clamping plate is an arc structure, and the arc surface of the clamping plate is adapted to the circumferential surface of the dial gauge.

[0010] Further, the top of the measuring support is provided with a sink, and the bottom of the measuring block is provided with a sliding rod, the sliding rod is slidingly installed in the sink.

[0011] Further, a second threaded hole is provided on the inner wall of the sink, an adjusting screw is screw-connected in the second threaded hole, a sliding groove is provided on the sliding rod, and a sliding block adapted to the sliding groove is rotatably connected to one end of the adjusting screw, the sliding block is slidingly installed in the sliding groove.

[0012] Further, the upper part of the measuring support is a triangular structure, the lower part of the measuring support is a rectangular structure, both sides of the lower part of the measuring support are provided with an inverted bevel, and both sides of the top of the measuring block are provided with an inverted round corner.

[0013] Advantages

[0014] Compared with the prior art, the utility model has the following advantages:

[0015] The utility model discloses a special gauge for pulley aperture short step measurement, installs the dial gauge on the measuring support, makes the measuring head of dial gauge, steel ball all with the step surface contact of the pulley bore of being measured, then rotates the measuring support, through the displacement of the measuring head of dial gauge on the step surface of pulley bore of being measured, through the measuring rod, the displacement of measuring head is passed to dial gauge, thereby reads the numerical value on dial gauge, convenient operation, and the measurement value is accurate, and the measurement accuracy is higher, improves the qualified rate of product. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the front view cross section structure schematic drawing of the utility model;

[0017] Figure 2 It is Figure 1 It is the structure enlarged diagram of A in the utility model;

[0018] Figure 3 It is the side view structure schematic drawing of the utility model;

[0019] Figure 4 It is the side view cross section structure schematic drawing of the measuring support in the utility model;

[0020] Figure 5 It is the structure schematic drawing of fastening bolt in the utility model.

[0021] Among them: 1-measuring support, 2-hollow cavity, 3-dial gauge, 4-through hole, 5-first threaded hole, 6-fastening bolt, 7-measuring block, 8-U-shaped groove, 9-steel ball, 10-first arc surface, 11-screw rod, 12-clamping plate, 13-sink groove, 14-sliding rod, 15-sliding block, 16-adjusting screw, 17-sliding groove, 18-second arc surface, 19-inverted bevel. DETAILED DESCRIPTION

[0022] The utility model will be further explained in combination with the specific embodiment in the drawings.

[0023] Refer to Figures 1-5The utility model provides a special gauge for pulley hole diameter short step measurement, including measuring support 1, dial gauge 3, be equipped with hollow cavity 2 on measuring support 1, the upper portion of measuring support 1 is triangular structure, and the triangle has higher stability, the bottom of hollow cavity 2 is equipped with through -hole 4 on measuring support 1, and the sleeve of dial gauge 3 is inserted in through -hole 4, and the measuring head of dial gauge 3 extends the lower end surface of measuring support 1, the end surface of one side of measuring support 1 bottom is equipped with first threaded hole 5, and first threaded hole 5 is communicated with through -hole 4, and the fastening bolt 6 for fixing dial gauge 3 is screw connected in first threaded hole 5, and the top of measuring support 1 is equipped with height adjustable measuring block 7, and the top of measuring block 7 is equipped with U -shaped groove 8, and one end of U -shaped groove 8 extends to the end surface of measuring block 7, and steel ball 9 is placed in U -shaped groove 8, and the width of U -shaped groove 8 is adapted to the diameter of steel ball 9, and the depth of U -shaped groove 8 is greater than the diameter of steel ball 9 two thirds, and steel ball 9 and the inner wall between the measured pulley inner hole are point contact, when using, the measuring rod of dial gauge 3 is inserted in through -hole 4, and the fastening bolt 6 is locked, makes dial gauge 3 install on measuring support 1, then measuring support 1 is placed in the measured pulley inner hole, makes the measuring head of dial gauge 3, steel ball 9 all with the step surface of the measured pulley inner hole contact, then rotates measuring support 1, passes through the measuring head of dial gauge 3 on the step surface of the measured pulley inner hole displacement, passes through the measuring rod and is transferred to dial gauge 3 with the displacement of measuring head, to read the numerical value on dial gauge 3, convenient operation, accurate measurement value, the measurement accuracy is higher, improves the qualified rate of product, and the scope of application is wider.

[0024] Preferably, when the steel ball 9 is attached to the other end of the U-shaped groove 8, the central axis of the steel ball 9 coincides with the central axis of the through hole 4, so that the center of rotation of the measuring support 1, the contact point of the steel ball 9 with the inner hole of the measured pulley, and the contact point of the measuring head of the dial gauge 3 with the inner hole of the measured pulley are on the same plane, improving the accuracy of the measurement.

[0025] In the present embodiment, the central axis of the through hole 4 and the central axis of the threaded hole 5 are on the same plane and perpendicular to each other, so that the sleeve of the dial gauge 3 is uniformly stressed, improving the stability of the dial gauge 3.

[0026] In the present embodiment, the fastening bolt 6 is made of plastic material, and the sleeve of the dial gauge 3 is made of metal material such as aluminum alloy. The hardness of the plastic fastening bolt 6 is lower than that of the sleeve of the dial gauge 3, which avoids the deformation of the sleeve of the dial gauge 3 caused by the mutual extrusion of the tightened bolt 6 and the sleeve, thereby affecting the accuracy of the measurement data.

[0027] In the embodiment, the bottom of the fastening bolt 6 is provided with a first arc surface 10 which is adapted to the circumferential surface of the sleeve of the dial gauge 3. When the fastening bolt 6 is tightened, the end surface of the bottom of the fastening bolt 6 is in contact with and is pressed against the circumferential surface of the sleeve of the dial gauge 3, so that the dial gauge is fixedly installed in the hollow cavity 2. The end surface of the bottom of the fastening bolt 6 is designed as the first arc surface 10 which is adapted to the circumferential surface of the sleeve of the dial gauge 3, so that the contact area between the fastening bolt 6 and the sleeve of the dial gauge 3 is increased, and the stability of the dial gauge 3 is improved.

[0028] In the embodiment, the two sides of the measuring support 1 are provided with the lead screws 11 which are threadedly connected with the measuring support 1. One end of the lead screw 11 which is located in the hollow cavity 2 is rotatably connected with the clamping plate 12, and the lead screw 11 is rotatably connected with the clamping plate 12 through a bearing. The two clamping plates 12 are respectively located at the two sides of the dial gauge 3. The clamping plate 12 is of an arc structure, and the arc surface of the clamping plate 12 is adapted to the circumferential surface of the dial gauge 3. After the dial gauge 3 is installed in the hollow cavity 2 by tightening the fastening bolt 6, the lead screw 11 which is threadedly connected with the measuring support 1 is rotated, so that the clamping plates 12 located at the two sides of the dial gauge 3 clamp the dial gauge 3, and the stability of the dial gauge 3 is further improved, and the dial gauge 3 is prevented from rotating or deviating in the process of measurement, so as to affect the measurement data.

[0029] In the embodiment, the top of the measuring support 1 is provided with the sink 13, and the bottom of the measuring block 7 is provided with the sliding rod 14 which is slidingly installed in the sink 13. The sliding rod 14 is adapted to the sink 13. The height of the measuring block 7 is adjusted by sliding the sliding rod 14 in the sink 13, so that the steel ball 9 at the top of the measuring block 7 is in contact with the inner wall surface of the inner hole of the measured pulley, and the measuring tool can be applied to the measurement of pulleys with different hole diameters, and the application range is expanded.

[0030] In the embodiment, the inner wall of the sink 13 is provided with the second threaded hole in which the adjusting screw 16 is threadedly connected. The sliding rod 14 is provided with the sliding groove 17. One end of the adjusting screw 16 is rotatably connected with the sliding block 15 which is adapted to the sliding groove 17. The adjusting screw 16 is rotatably connected with the sliding block 15 through a bearing. The sliding block 15 is slidingly installed in the sliding groove 17. After the measuring block 7 is adjusted to the required height, the sliding rod 14 is fixed by tightening the adjusting screw 16, so that the measuring block 7 is fixed.

[0031] In the embodiment, the upper part of the measuring support 1 is of a triangular structure, and the lower part of the measuring support 1 is of a rectangular structure. The two sides of the lower part of the measuring support 1 are provided with the inverted bevel 19, and the two sides of the top of the measuring block 7 are provided with the inverted round corner 18. In the process of rotating the measuring support 1, the bottom of the measuring support 1 and the top of the measuring block 7 are prevented from colliding with the stepped surface of the inner hole of the measured pulley, interference is avoided, and the accuracy of the measurement data is affected.

[0032] The above merely is preferred implementation manner of the present application, it should be pointed out that for the person skilled in the art without departing from the premise of the structure of the present application, still can make several deformation and improvement, these will not influence the effect and the practicality of the patent of the present application implementation.

Claims

1. A special purpose gauge for pulley bore short step measurement characterized by, The utility model relates to a measuring support (1) is provided with hollow cavity (2) on the measuring support (1), the bottom of hollow cavity (2) is provided with through -hole (4), the sleeve of dial gauge (3) is inserted in through -hole (4) activity, the end face of one side of measuring support (1) bottom is provided with first threaded hole (5), first threaded hole (5) is communicated with through -hole (4), the first threaded hole (5) is connected with the fastening bolt (6) for fixing dial gauge (3) in screw thread, the top of measuring support (1) is provided with height adjustable measuring block (7), the top of measuring block (7) is provided with U -shaped groove (8), one end of U -shaped groove (8) extends to the end face of measuring block (7), the steel ball (9) is placed in the activity of U -shaped groove (8).

2. A special purpose gauge for measuring short steps in the bore of a pulley as claimed in claim 1, wherein, The central axis of the through hole (4) and the central axis of the threaded hole (5) are in the same plane and perpendicular to each other.

3. A special purpose gauge for measuring short steps in the bore of a pulley as claimed in claim 1, wherein, The fastening bolt (6) is made of plastic material.

4. A special gauge for measuring the short step of the pulley bore according to claim 3, characterized in that, The bottom of the fastening bolt (6) is provided with a first arc surface (10), and the first arc surface (10) is adapted to the circumference of the sleeve of the dial gauge (3).

5. A special purpose gauge for measuring short steps in the bore of a pulley as claimed in claim 1, wherein, Both sides of the measuring support (1) are provided with a lead screw (11) threadedly connected with the measuring support (1), one end of the lead screw (11) located in the hollow cavity (2) is rotatably connected with a clamping plate (12), the two clamping plates (12) are respectively located on both sides of the dial gauge (3), the clamping plate (12) is an arc structure, and the arc surface of the clamping plate (12) is adapted to the circumference of the dial gauge (3).

6. A special purpose gauge for measuring short steps in the bore of a pulley as defined in claim 1, wherein, The top of the measuring support (1) is provided with a sink (13), and the bottom of the measuring block (7) is provided with a sliding rod (14) slidingly installed in the sink (13).

7. A special purpose gauge for measuring short steps in the bore of a pulley as claimed in claim 6, wherein, The inner wall of the sink (13) is provided with a second threaded hole, and an adjusting screw (16) is threadedly connected in the second threaded hole, the sliding rod (14) is provided with a sliding groove (17), one end of the adjusting screw (16) is rotatably connected with a sliding block (15) adapted to the sliding groove (17), and the sliding block (15) is slidingly installed in the sliding groove (17).

8. A special purpose gauge for measuring short steps in the bore of a pulley as defined in claim 1, wherein, The upper part of the measuring support (1) is a triangular structure, the lower part of the measuring support (1) is a rectangular structure, both sides of the lower part of the measuring support (1) are provided with inverted bevels (19), and both sides of the top of the measuring block (7) are provided with inverted rounded corners (18).

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