CN110836625A - A cantilever type high-precision length measuring device - Google Patents

Abstract

The invention discloses a cantilever type high-precision length measuring device, which comprises a measuring head, the measuring head is provided with a first boss extending outward, the measuring head is fixed on the upper part of a sliding rod; The lower part of the rod is set in the concrete, and can slide within the concrete for a set distance; the concrete is provided with a second boss extending outward, and the upper surface of the first boss and the upper surface of the second boss are Parallel setting; the quantity is specifically set on a support, a dial indicator is set in the support, the dial head is clamped on the support upward, and the dial head is coaxial with the sliding rod Set and the top of the meter head can be in contact with the bottom end of the slider. It can be positioned to the reference surface and the measurement surface with high precision, with high measurement accuracy and improved product consistency.

Description

A cantilever type high-precision length measuring device

technical field

The invention relates to a cantilever type high-precision length measuring device.

Background technique

Generally, for the length dimension of the workpiece with simple shape, low precision of the measured dimension, and convenient measurement, a general gauge, such as a tape measure, steel ruler, vernier caliper, etc., can be selected according to the accuracy requirements. In the following cases, special special gauges are widely used in workpiece processing and assembly inspection: 1. General gauges cannot meet the inspection requirements; 2. In order to be convenient to use, improve the inspection efficiency to meet the requirements of mass production; 3. The measured The accuracy of the length dimension is required to be high, and the detected workpiece part is more complex.

The length measuring device of the cantilever structure belongs to high-precision measurement, and usually uses a general gauge for measurement. Due to the different shapes of the cantilever structure, there are some interference parts, which cannot be accurately positioned to the measurement surface, which affects the measurement accuracy. As shown in the shape of the workpiece in Fig. 13, the two ends of the measured dimension "L" are blocked, that is, there is interference of the boss G and it is inconvenient to measure, or the measurement is similar to the shape of the proofing block in Fig. 12 (dimension b≤c) The length of the workpiece dimension "a"; it is difficult for traditional measuring tools to avoid the interference part and protrude into the measured part, so the measured dimension cannot be accurately obtained.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve the above problems and provide a cantilever type high-precision length measuring device, which can be positioned to the reference plane and the measuring plane with high precision, has high measuring accuracy, and improves the consistency of products.

In order to achieve the above purpose, the technical solution adopted in the present invention is: a cantilever type high-precision length measuring device, which includes a measuring head, the measuring head is provided with a first boss extending outward, and the measuring head is provided with a first boss extending outward. It is fixed on the upper part of the sliding rod; the lower part of the sliding rod is set in the measuring body, and can slide a set distance within the measuring body; the measuring body is provided with a second boss extending outward, and the first boss is The upper surface is arranged in parallel with the upper surface of the second boss; the quantity is specifically arranged on a support, a dial indicator is arranged in the support, and the head of the dial indicator is clamped on the support upwards, The watch head and the sliding rod are coaxially arranged, and the top of the watch head can be in contact with the bottom end of the sliding rod.

Further, the amount specifically includes a cylindrical tube and a second boss, the middle of the cylindrical tube is provided with stepped holes running through its two ends, and the stepped holes are set from top to bottom as a sliding rod installation hole, a spring placement hole, and a screw sleeve. Mounting threaded holes and transition holes; two sides of the bottom of the cylindrical barrel are symmetrically provided with mounting bosses, the mounting bosses and the cylindrical barrel are arranged in a "T" shape, and the mounting bosses are all provided with fixing holes; the first The two bosses are arranged on the top of the concrete, which are perpendicular to the cylinder wall of the cylindrical cylinder and are arranged in the shape of a "7".

Further, the sliding rod is a stepped shaft, which is arranged from top to bottom into a threaded section, a probe installation section, a shaft shoulder section, a sliding section and a spring installation section, and a rectangular groove is opened in the middle of the cylindrical surface of the sliding section, so The measuring head installation section is provided with a limiting hole; the sliding section is arranged in the sliding rod installation hole.

Further, a nut is provided on the threaded section, and the bottom of the nut is in contact with the top of the probe.

Further, the measuring head includes a cylinder body and a first boss connected with the cylinder body, the cylinder body is arranged in the measuring head installation section, and the outer wall of the cylinder is provided with a second threaded hole arranged perpendicular to the cylinder wall, A set screw is set in the second threaded hole, and the end of the set screw is set in the limit hole on the sliding rod.

Further, a first threaded hole perpendicular to the sliding rod installation hole is provided on the outer wall of the sliding rod installation hole section at the upper part of the measuring unit, a guide screw is arranged in the first threaded hole, and the end of the guide screw is provided. It is arranged in the rectangular groove and does not contact the bottom of the rectangular groove, and the height of the rectangular groove is larger than the diameter of the guide screw.

Further, a spring is sleeved on the spring installation section, and the spring is arranged in the spring placement hole; the upper end of the spring is in contact with the lower end of the sliding section, and the lower end is in contact with the top surface of the outer threaded sleeve; the outer threaded sleeve is in contact with the threaded sleeve. The sleeve installation threaded hole is matched, and the bottom end of the spring installation section is arranged in the inner hole of the external threaded sleeve.

Further, the support is set in an arch shape, and the top of the arch is provided with a watch head mounting hole in the middle, a bushing is sleeved in the watch head mounting hole, and the bushing is set as a notched C-ring The bushing holds the watch head and is clamped in the installation hole of the watch head; third threaded holes are symmetrically arranged on both sides of the arched top of the support, and the third threaded hole is connected to the mounting protrusion at the bottom of the measuring body. The fixing holes on the table are matched and fastened by the second screw.

Further, an annular groove is arranged in the middle of the outer wall of the bushing, and a fourth threaded hole perpendicular to the mounting hole of the head is arranged on the side of the support, the fourth threaded hole is communicated with the annular groove, and the fourth threaded hole is provided. A knurled screw is arranged in the hole, and the screwed end of the knurled screw is arranged in the annular groove.

Beneficial effects of the present invention:

1. The probe and the positioning surface of the cantilever structure of the present invention can extend into the measured part, and cleverly avoid the interference part, so that the reading can be accurately obtained to judge whether the size of the workpiece is qualified.

2. The present invention adopts a dial indicator for reading, which not only has high sensitivity and high measurement accuracy, but also has an intuitive and clear reading.

3. The present invention has the advantages of simple structure, convenient use, easy maintenance and high work efficiency, and can be widely used in practical production.

4. The sliding bar designed by the present invention can be automatically reset after the measurement, and it is convenient to use.

Description of drawings

Figure 1 is a side sectional view of the present invention.

FIG. 2 is a front cross-sectional view of the present invention.

Figure 3 is a top view of the present invention.

FIG. 4 is a specific front cross-sectional view of the present invention.

Figure 5 is a specific top view of the quantity of the present invention.

FIG. 6 is a front view of the slide bar of the present invention.

FIG. 7 is a front view of the probe of the present invention.

Figure 8 is a top view of the bushing of the present invention.

FIG. 9 is a front cross-sectional view of the bushing of the present invention.

Figure 10 is a front cross-sectional view of the support of the present invention.

Figure 11 is a cross-sectional view of the external thread sleeve of the present invention.

FIG. 12 is a structural view of the proofreading block of the present invention.

Figure 13 is a schematic diagram of the workpiece of the present invention.

Detailed ways

In order to make the above objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention will be described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific implementation disclosed below.

As shown in Figures 1-11, the specific structure of the present invention is: a cantilever type high-precision length measuring device, which is arranged from top to bottom as a sliding rod 13, a nut 7, a measuring head 14, a measuring device 12, a spring 11. External thread sleeve 4, dial indicator 6, support 3 and base 1.

The nut 7 is arranged on the top of the sliding rod 13 to press against the measuring head 14 arranged on the upper part of the sliding rod 13, and a first boss 142 extending outward is provided on the measuring head 14; the lower part of the sliding rod 13 is arranged on the measuring body 12 , and can slide a set distance within the measuring body 12; the measuring body 12 is provided with a second boss 136 extending outward, and the upper surface of the second boss 136 is arranged in parallel with the upper surface of the first boss 142 , the two upper surfaces are used as the contact planes with the workpiece to be measured, and the upper surface of the second boss 136 is used as the measurement reference positioning surface, with high hardness and shape and position accuracy, and the second boss is equivalent to the outer measuring claw of the vernier caliper, The upper surface of the first boss 142 is used as a measuring surface, with high hardness and precision, which is equivalent to the inner measuring claw of a vernier caliper; a spring 11 is also arranged in the measuring body 12, and the spring 11 is arranged on the lower small shaft of the sliding rod 13 , and limit the position of the lower end of the spring 11 by setting the inner and outer thread sleeves 4 in the concrete 12, and the maximum compression or elongation length of the spring 11 is limited by the sliding distance of the sliding rod 13 in the concrete 12; the bottom end of the sliding rod 13 slides downward When the dial indicator 6 is in contact with the top of the head 61 of the dial indicator 6, the reading can be obtained on the dial indicator 6 by contacting and pressing the indicator head 61; The support 3 is fixed on the base 1 .

Preferably, the measuring body 12 includes a cylindrical cylinder 127 and a second boss 126. The cylindrical cylinder 127 is provided with stepped holes penetrating both ends in the middle, and the stepped holes are set from top to bottom as a sliding rod mounting hole 121, a spring placement hole 122, a screw Sleeve installation threaded hole 123 and transition hole 128; the sliding rod 13 is set in the sliding rod installation hole 121, and the sliding rod 13 slides up and down in the sliding rod installation hole 121; the spring 11 is placed in the spring placing hole 122, and the spring 11 is in the hole Compression is performed; the screw sleeve installation threaded hole 123 is provided with an external threaded sleeve 4, and the thread height of the threaded sleeve installation threaded hole 123 is greater than the height of the external threaded sleeve 4, so that the external threaded sleeve 4 can be screwed up and down in the screw sleeve installation threaded hole 123 , so as to adjust the compression amount of the spring 11 ; the transition hole 128 plays a transition role, and the screw sleeve installation threaded hole 123 is opened through the transition hole 128 ;

Further, mounting bosses 124 are symmetrically arranged on both sides of the bottom of the cylindrical barrel 127, the mounting bosses 124 and the cylindrical barrel 127 are arranged in a "T" shape, and the mounting bosses 124 are provided with fixing holes 125; The two bosses 126 are arranged on the top of the measuring body 12 , are perpendicular to the wall of the cylindrical barrel 127 and are arranged in a "7" shape.

Preferably, the sliding rod 13 is a stepped shaft, and is arranged from top to bottom into a threaded section 131, a probe installation section 132, a shoulder section 133, a sliding section 134 and a spring installation section 135; the nut 7 is arranged on the threaded section 131 and pressed The measuring head 14, the measuring head 14 is arranged on the measuring head installation section 132, the bottom of which is in contact with the top surface of the shoulder section 133; the sliding section 134 is arranged in the sliding rod installation hole 121, and the sliding section 134 has a clearance between the sliding rod installation hole 121 Matching, the diameter of the sliding rod mounting hole 121 is smaller than the diameter of the shoulder section 133, a rectangular groove 136 is opened in the middle of the cylindrical surface of the sliding section 134, and the sliding rod 13 slides up and down in the area between the upper and lower ends of the rectangular groove 136. Specifically, a first threaded hole 129 perpendicular to the sliding rod installation hole 121 is provided on the outer wall of the sliding rod installation hole 121 on the upper part of the 12. The first threaded hole 129 is provided with a guide screw 9. The end of the guide screw 9 The upper part is arranged in the rectangular groove 136 and does not contact the bottom of the rectangular groove. The height of the rectangular groove 136 is greater than the diameter of the guide screw 9. The width of the slot 136 is slightly larger than the diameter of the guide screw 9 to prevent the sliding rod 13 from rotating.

Further, the inner hole of the outer threaded sleeve 4 is set as a small hole 41 at the contact end of the spring 11 and a large hole 42 at the lower part of the small hole, the small hole 41 and the large hole 42 are arranged coaxially, and the diameter of the small hole 41 is smaller than that of the spring 11. The large diameter also fits with the spring mounting section 135 of the sliding rod 13 in a clearance fit; it is convenient to block the bottom end of the spring 11, the top of the spring 11 is blocked by the bottom of the sliding section 134, and the spring mounting section 135 can move in the outer threaded sleeve 4; the large hole The top of the watch head 61 can be accommodated in 42 , so that the watch head 61 can be in contact with the bottom end of the sliding rod 13 .

Preferably, the measuring head 14 includes a cylindrical body 141 and a first boss 142 connected to the cylindrical body 141 , the cylindrical body 141 is arranged on the measuring head mounting section 132 of the sliding rod 13 , and a vertical A second threaded hole 143 provided on the cylinder wall, a set screw 8 is set in the second threaded hole 143; a limit hole 137 is provided on the probe installation section 132, and the end of the set screw 8 is set in the limit hole 137, through the second threaded hole 143 through the set screw 8 and set in the limit hole 137 to limit the rotation and up and down movement of the probe 14, and set the nut 7 on the upper part of the probe 14 to press the probe 14 again, Install it securely.

Preferably, the support 3 is set in an arch shape, the top of the arch is provided with a head mounting hole 32 , a bushing 5 is sleeved in the head mounting hole 32 , and the bushing 5 is set as a C-ring with a notch 52 . The bushing 5 hugs the watch head 61 and is clamped in the watch head mounting hole 32, similar to the expansion sleeve; the arched top of the support 3 is symmetrically provided with third threaded holes 31 on both sides. The threaded hole 31 is matched with the fixing hole 125 on the mounting boss 124 at the bottom of the measuring body 12 and is fastened by the second screw 17; It is arranged on the base 1 , the base 1 has a U-shaped structure, and the base 1 is fixed to the bottom of the support 3 by the first screw 2 .

Preferably, an annular groove 51 is provided in the middle of the outer wall of the bushing 5, and a fourth threaded hole 33 perpendicular to the head mounting hole 32 is provided on the side of the support 3. The fourth threaded hole 33 communicates with the annular groove 51. A knurled screw 10 is provided in the fourth threaded hole 33 , and the end portion of the knurled screw 10 is screwed into the annular groove 51 .

When the present invention is used specifically, as shown in Figures 1-13, before use, loosen the knurled screw 10, hook the C surface of the probe 14 with the A surface of the proofing block 15, and press the probe 14 to move downward. , so that the B side of the proofing block 15 is placed on the D side of the measuring unit 12 to closely fit it; then loosen the knurled screw 10 and adjust the dial indicator so that the head 61 of the dial indicator 6 and the slider 13 The end face of the spring installation section 135 is in contact and the pointer is aligned with the zero position; then tighten the knurled screw 10, and hold the dial indicator 6 through the shaft sleeve 5, so that the dial indicator 6, the bushing 5 and the support 3 have no relative movement; After ensuring that the pointer of the dial indicator 6 is aligned with the zero position, the measurement can be started.

When measuring, hook the surface E of the workpiece to be measured on the surface C of the probe 14, press the probe 14 to drive the slide bar 13 to move down together against the action of the spring force, so that the surface F of the workpiece is placed on the surface D of the measuring unit. At this time, the spring 11 is continuously compressed, and the end face of the spring mounting section 135 of the sliding rod 13 is pressed against the head 61 of the dial indicator 6, so that it is pressed into the watch sleeve; The pointer of the sub-table 6 rotates to display the reading, and the workpiece size is qualified according to the deviation of the pointer from the zero position.

When the measurement is over, the workpiece is removed, the slide bar 13 moves up under the action of the spring force, the head of the dial indicator 6 is reset, and the pointer returns to the zero position. If the force of pressing the head 61 during measurement is too large or too small, the outer threaded sleeve 4 can be turned down or up, so that the initial compression amount of the compression spring 11 is reduced (pre-pressure is small) or increased, which is relatively easy to use. flexible.

Claims (9)

1. A cantilever type high-precision length measuring device, characterized in that it comprises a measuring head, the measuring head is provided with a first boss extending outward, and the measuring head is fixed on the upper part of the sliding rod; The lower part of the sliding rod is arranged in the concrete, and can slide a set distance within the concrete; the concrete is provided with a second boss extending outward, and the upper surface of the first boss is connected to the second boss. The upper surface is arranged in parallel; the quantity is specifically set on the support, the support is provided with a dial indicator, the head of the dial indicator is upwardly clamped on the support, and the head is connected to the sliding rod. It is coaxially arranged and the top of the meter head can be in contact with the bottom end of the sliding rod. 2 . The cantilever type high-precision length measuring device according to claim 1 , wherein the measurement specifically comprises a cylindrical tube and a second boss, and a stepped hole penetrating both ends of the cylindrical tube is arranged in the middle of the cylindrical tube, 2 . The stepped holes are arranged from top to bottom as a sliding rod installation hole, a spring placement hole, a screw sleeve installation threaded hole and a transition hole; two sides of the bottom of the cylindrical barrel are symmetrically provided with mounting bosses, and the mounting bosses are connected to the cylindrical barrel. It is arranged in a "T" shape, and the mounting bosses are all provided with fixing holes; the second bosses are arranged on the top of the concrete, which is perpendicular to the cylinder wall of the cylindrical tube and is arranged in a "7" shape. 3. A cantilever type high-precision length measuring device according to claim 2, wherein the sliding rod is a stepped shaft, and is arranged from top to bottom as a thread section, a probe installation section, a shaft shoulder section, A sliding segment and a spring mounting segment are provided, a rectangular groove is provided in the middle of the cylindrical surface of the sliding segment, a limiting hole is provided on the measuring head mounting segment; the sliding segment is arranged in the sliding rod mounting hole. 4 . The cantilever type high-precision length measuring device according to claim 3 , wherein a nut is provided on the threaded section, and the bottom of the nut is in contact with the top of the measuring head. 5 . 5 . The cantilever type high-precision length measuring device according to claim 3 , wherein the measuring head comprises a cylinder body and a first boss connected with the cylinder body, and the cylinder body is arranged on the measuring head. 6 . The installation section, the outer wall of the cylinder is provided with a second threaded hole perpendicular to the cylinder wall, the second threaded hole is provided with a set screw, and the end of the set screw is set at the limit on the sliding rod inside the hole. 6 . The cantilever type high-precision length measuring device according to claim 3 , wherein the upper part of the measuring body is provided with a first thread perpendicular to the sliding rod mounting hole on the outer wall of the sliding rod mounting hole section. 7 . A guide screw is arranged in the first threaded hole, the end of the guide screw is arranged in a rectangular groove and does not contact the bottom of the rectangular groove, and the height of the rectangular groove is greater than the diameter of the guide screw. 7 . The cantilever type high-precision length measuring device according to claim 3 , wherein a spring is sleeved on the spring installation section, and the spring is arranged in the spring placement hole; The lower end of the sliding section is in contact with the top surface of the outer threaded sleeve; the outer threaded sleeve is matched with the threaded sleeve installation threaded hole, and the bottom end of the spring installation section is arranged in the inner hole of the outer threaded sleeve. 8 . The cantilever type high-precision length measuring device according to claim 1 , wherein the support is arranged in an arch shape, and a watch head mounting hole is provided in the middle of the top of the arch shape, and the watch head A bushing is sleeved in the mounting hole, the bushing is arranged in a C-shaped annular structure with a gap, and the bushing hugs the watch head and is clamped in the mounting hole of the watch head; A third threaded hole is arranged symmetrically on the side, the third threaded hole is matched with the fixing hole on the mounting boss at the bottom of the measuring body and is fastened by a second screw. 9 . The cantilever type high-precision length measuring device according to claim 8 , wherein an annular groove is arranged in the middle of the outer wall of the bushing, and a fourth vertical meter mounting hole is arranged on the side of the support. 10 . A threaded hole, the fourth threaded hole communicates with the annular groove, a knurled screw is arranged in the fourth threaded hole, and the end portion of the knurled screw is arranged in the annular groove.

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