阅读说明：本技术 一种凸轮轴销孔胀紧测量销 (Camshaft pinhole tight measuring pin that expands ) 是由 焦艳新 高四新 于 2020-05-27 设计创作，主要内容包括：本发明属于凸轮轴销孔测量技术领域,具体的说是一种凸轮轴销孔胀紧测量销；包括测量销头和测量柱；测量柱的一端部通过限位盘连接有测量销头,且测量柱的另一端内部开设有插接腔；测量柱的圆周外壁上均匀开设有滑动腔；滑动腔的两端内壁上设置有限位块,且滑动腔内滑动设置定位柱；定位柱的两端外壁上开设有限位槽,且限位槽内通过弹簧滑动设置有限位块,且弹簧位于测量柱的内部；插接腔内插接挤压有挤压柱,且挤压柱的一端部通过螺纹柱螺纹连接到螺纹孔内；挤压柱与测量柱上滑动设置的多个定位柱挤压接触,且挤压柱的另一端部位于测量柱的外部；不仅提高了测量销的测量稳定性和准确性,同时提高了测量销在销孔内的插接的稳定性。(The invention belongs to the technical field of camshaft pin hole measurement, and particularly relates to a camshaft pin hole expansion measuring pin; comprises a measuring pin head and a measuring column; one end of the measuring column is connected with a measuring pin head through a limiting disc, and a splicing cavity is formed in the other end of the measuring column; sliding cavities are uniformly formed in the circumferential outer wall of the measuring column; limiting blocks are arranged on the inner walls of the two ends of the sliding cavity, and a positioning column is arranged in the sliding cavity in a sliding manner; limiting grooves are formed in the outer walls of the two ends of the positioning column, limiting blocks are arranged in the limiting grooves in a sliding mode through springs, and the springs are located inside the measuring column; an extrusion column is inserted and extruded in the insertion cavity, and one end part of the extrusion column is connected into the threaded hole through a threaded column thread; the extrusion column is in extrusion contact with a plurality of positioning columns which are arranged on the measuring column in a sliding way, and the other end part of the extrusion column is positioned outside the measuring column; the measuring stability and accuracy of the measuring pin are improved, and meanwhile, the inserting stability of the measuring pin in the pin hole is improved.)

1. A camshaft pin hole expansion measuring pin comprises a measuring pin head (1) and a measuring column (2); the method is characterized in that: one end part of the measuring column (2) is connected with a measuring pin head (1) through a limiting disc (3), and a splicing cavity (21) is formed in the other end of the measuring column (2); sliding cavities (22) are uniformly formed in the circumferential outer wall of the measuring column (2), and at least 4 sliding cavities (22) are formed; the measuring column (2) is spliced; the inner walls of two ends of the sliding cavity (22) are provided with limiting blocks (4), and the sliding cavity (22) is internally provided with positioning columns (5) in a sliding manner; limiting grooves (51) are formed in the outer walls of the two ends of the positioning column (5), limiting blocks (4) are arranged in the limiting grooves (51) in a sliding mode through springs, and the springs are located inside the measuring column (2); a threaded hole (23) is formed in one end of the measuring column (2), and the threaded hole (23) is located in the side wall of the limiting disc (3); an extrusion column (6) is inserted and extruded in the insertion cavity (21), and one end part of the extrusion column (6) is connected into the threaded hole (23) through a threaded column (7) in a threaded manner; the extrusion column (6) is in extrusion contact with a plurality of positioning columns (5) which are arranged on the measuring column (2) in a sliding manner, and the other end part of the extrusion column (6) is positioned outside the measuring column (2).

2. The camshaft pin bore expansion measurement pin of claim 1, wherein: an expansion cavity (61) is formed in the outer ring wall of the extrusion column (6), and the outer wall of the expansion cavity (61) is an elastic layer (62); a flow guide cavity (71) is formed in the threaded column (7), and the flow guide cavity (71) is communicated with the expansion cavity (61); a liquid cavity (31) is formed in the limiting disc (3), and liquid is filled in the liquid cavity (31) through an elastic membrane (8); the side wall of the liquid cavity (31) is provided with a drainage hole (32), and the drainage hole (32) is communicated with the threaded hole (23); the extrusion strips (9) are uniformly arranged on the outer ring wall of the liquid cavity (31) in a sliding manner, and the sections of the extrusion strips (9) are of T-shaped structures; one end of the extrusion strip (9) is connected with the outer wall of the elastic membrane (8), and the other end of the extrusion strip (9) is positioned outside the limiting disc (3).

3. The camshaft pin bore expansion measurement pin of claim 2, wherein: the end part of the threaded column (7) is provided with a drainage groove (72); the tip of drainage hole (32) has sealed dish (10) through spring coupling, and sealed dish (10) rotate extrusion contact with the tip of screw thread post (7).

4. The camshaft pin bore expansion measurement pin of claim 3, wherein: clamping cavities (33) are uniformly formed in the upper side wall and the lower side wall of the liquid cavity (31), and the clamping cavities (33) are obliquely arranged; a limiting cavity (91) is formed in the extrusion strip (9), and a T-shaped inserting strip (11) is arranged in the limiting cavity (91) in a sliding mode through a spring; elastic clamping strips (12) are arranged on the upper end face and the lower end face of the T-shaped inserting strip (11), and the elastic clamping strips (12) are clamped into the clamping cavity (33) in a sliding mode; the end part of the T-shaped inserting strip (11) is positioned outside the extrusion strip (9).

5. The camshaft pin bore expansion measurement pin of claim 4, wherein: a guide ring (13) is fixedly arranged in the guide cavity (71), and a sealing ring (14) is inserted on the guide ring (13) in a sliding manner through a spring; guide holes (141) are uniformly formed in the circumferential direction of the sealing ring (14), and the upper end face of the sealing ring (14) is connected to the sliding ring (16) through an elastic rope (15); the sliding ring (16) is slidably sleeved on the outer wall of the threaded column (7).

6. The camshaft pin bore expansion measurement pin of claim 5, wherein: an elastic layer (62) is arranged on one side surface of the flow guide ring (13), and the elastic layer (62) is elastically pressed and contacted with the sealing ring (14); the elastic layer (62) is internally provided with a spring.

Technical Field

The invention belongs to the technical field of camshaft pin hole measurement, and particularly relates to a camshaft pin hole expansion measuring pin.

Background

When using ADCOLE to measure a camshaft, a measuring pin is needed to assist in measuring the pin hole center position in order to determine the phase angle relationship between the camshaft pin hole and the cam.

The Chinese patent discloses a camshaft pinhole expansion measuring pin, the patent application number is 2014207768347, and the main characteristics are that the axial direction of the cylinder body of the measuring pin is inwards provided with a hole, the cylinder wall vertical to the axial direction is provided with through holes communicated with the hole, steel balls are arranged in the two through holes, wedge-shaped blocks are respectively arranged in the holes at the two sides of the two steel balls, and a spring is arranged between the wedge-shaped block close to the cylinder port and the seal of the port.

The pin holes can be measured; when the diameter that above-mentioned measuring pin needs to measure the pinhole is great, then through adjusting its inside steel ball, and then realize that the cylinder can be suitable for with the pinhole of equidimension not, and this kind of measuring pin is because inside steel ball is the point contact with pinhole inner wall, and then leads to easily that the measuring pin appears installing unstably in the pinhole, leads to easily simultaneously that the measuring pin produces the phenomenon of slope, and then influences the poor phenomenon of measuring accuracy of measuring pin.

Disclosure of Invention

In order to make up for the defects of the prior art, the invention provides a camshaft pin hole expansion measuring pin which is mainly used for solving the problem that when the diameter of a pin hole needs to be measured by the existing measuring pin is larger, the cylinder can be suitable for pin holes with different sizes by adjusting the steel ball in the existing measuring pin, and the measuring pin is easy to cause instable installation of the measuring pin in the pin hole and also easy to cause the phenomenon that the measuring pin inclines so as to influence the phenomenon that the measuring accuracy of the measuring pin is poor because the steel ball in the existing measuring pin is in point contact with the inner wall of the pin hole.

The technical scheme adopted by the invention for solving the technical problems is as follows: the invention relates to a camshaft pin hole expansion measuring pin, which comprises a measuring pin head and a measuring column; one end of the measuring column is connected with a measuring pin head through a limiting disc, and a splicing cavity is formed in the other end of the measuring column; sliding cavities are uniformly formed in the circumferential outer wall of the measuring column, and at least 4 sliding cavities are formed in the sliding cavities; the measuring columns are arranged in a splicing manner; limiting blocks are arranged on the inner walls of the two ends of the sliding cavity, and a positioning column is arranged in the sliding cavity in a sliding mode; limiting grooves are formed in the outer walls of the two ends of the positioning column, limiting blocks are arranged in the limiting grooves in a sliding mode through springs, and the springs are located inside the measuring column; a threaded hole is formed in one end of the measuring column and is positioned on the side wall of the limiting disc; an extrusion column is inserted and extruded in the insertion cavity, and one end part of the extrusion column is connected into the threaded hole through a threaded column thread; the extrusion column is in extrusion contact with a plurality of positioning columns which are arranged on the measuring column in a sliding manner, and the other end of the extrusion column is positioned outside the measuring column;

when the device works, when a detector needs to perform expansion measurement on the pin hole of the camshaft, the detector can adjust the outer diameter corresponding to the measuring pin according to the inner diameter of the pin hole; at the moment, manufacturers can correspondingly produce extrusion columns with different diameters; the detection personnel inserts the extrusion column with the corresponding diameter into the measuring column, the outer wall of the extrusion column can extrude the positioning columns to enable the positioning columns to slide towards the outer wall of the measuring column, at the moment, the limiting block can extrude the spring, the detection personnel can measure the outer ring distance between the two corresponding positioning columns through the measuring scale, and simultaneously measure the distance between the other two corresponding positioning columns, so that at least four sliding positioning columns can form the inner diameter size corresponding to the pin hole outside the measuring column, then the detection personnel rotates the threaded column at the end part of the extrusion column to be connected into the threaded hole in a threaded manner, further the sliding-out positioning columns can be fixed through the extrusion column, then the detection personnel inserts the measuring column into the pin hole, so that the positioning columns can form an annular surface to be attached to the inner wall of the pin hole, further the measuring column can be tightly matched with the pin hole, and the measuring column can be stably inserted, then, the measuring personnel takes the pin head as the center, and then accurately measures the pin hole; through the matching of the extrusion columns and the positioning columns, the extrusion columns with different diameters can extrude the positioning columns to slide out to the outer walls of the measuring columns, so that at least one positioning column can form annular rings with different sizes on the outer walls of the measuring columns, the measuring pins can measure pin holes with different sizes, and meanwhile, the positioning columns can form annular surface contact with the inner walls of the pin holes, thereby not only improving the measuring stability and accuracy of the measuring pins, but also improving the inserting stability of the measuring pins in the pin holes; the existing measuring pin is also provided with a pin hole which can be suitable for pin holes with different sizes by adjusting the steel ball inside the measuring pin, and the measuring pin is easy to cause the phenomenon that the measuring pin is instable to be installed in the pin hole and poor in measuring precision because the steel ball inside the measuring pin is in point contact with the inner wall of the pin hole.

Preferably, an expansion cavity is formed in the outer ring wall of the extrusion column, and the outer wall of the expansion cavity is an elastic layer; a flow guide cavity is formed in the threaded column and is communicated with the expansion cavity; a liquid cavity is formed in the limiting disc, and liquid is filled in the liquid cavity through an elastic membrane; the side wall of the liquid cavity is provided with a drainage hole, and the drainage hole is communicated with the threaded hole; the outer ring wall of the liquid cavity is uniformly provided with an extrusion strip in a sliding manner, and the section of the extrusion strip is of a T-shaped structure; one end of the extrusion strip is connected with the outer wall of the elastic membrane, and the other end of the extrusion strip is positioned outside the limiting disc; when the measuring column needs to be inserted into the pin hole, a detector can enable the size of an annular ring formed by the positioning columns to rotate in the pin hole, and the measuring column can be conveniently and quickly inserted into the pin hole; then, a detection person can extrude the extrusion strip to enable the extrusion strip to shrink towards the inside of the liquid cavity, liquid filled in the elastic membrane can flow into the flow guide cavity through the drainage hole under the action of extrusion force and then flow into the expansion cavity through the flow guide cavity, the liquid enters the expansion cavity to enable the elastic layer to expand along with continuous extrusion of the extrusion strip by the detection person, and further the extrusion column can continue to extrude the positioning column, so that the positioning column formed into the annular ring can be tightly attached to the pin hole, no gap exists between the measurement column and the pin hole after adjustment, the measurement pin cannot rotate, and the accurate auxiliary measurement effect of the measurement pin is further improved; meanwhile, if the measuring pin is taken out, a detector can pull the extrusion strip outwards, the extrusion strip can drive the elastic membrane to pump out liquid in the expansion cavity, so that the elastic layer contracts, a certain gap is formed between the positioning column forming the annular ring and the inner wall of the pin hole, the detector can quickly pump out the measuring column from the pin hole, and the friction force between the extended positioning column and the pin hole is reduced, so that the positioning column is abraded in long-term use, the service life of the positioning column is influenced, and the use precision of the matching of the positioning column and the measuring column is influenced; if different measuring pins are adopted in the prior art, the measuring pins are easy to rub the pin holes when being extracted or inserted into the pin holes, so that the measuring pins are difficult to extract, and the service lives of the measuring pins are influenced; simultaneously through the distance between the steel ball of regulation for the cylinder can insert in the pinhole, and the steel ball can produce sliding friction with the inner wall in pinhole this moment, and then when the steel ball on the cylinder was used for a long time, can produce the phenomenon of wearing and tearing.

Preferably, the end part of the threaded column is provided with a drainage groove; the end part of the drainage hole is connected with a sealing disc through a spring, and the sealing disc is in rotating extrusion contact with the end part of the threaded column; when the liquid guide device works, when the threaded column at the end part of the extrusion column is in threaded connection with the threaded hole, the threaded column can extrude the sealing disc arranged at the end part of the drainage hole, so that the sealing disc opens the liquid cavity, then the extrusion strip is extruded by a detector, and liquid can flow into the flow guide cavity through the drainage groove; after the extrusion post breaks away from measuring the post, the sealed tip that can laminate the drainage hole under the restoring force of spring of dish, and then be convenient for seal the liquid chamber, prevent that the liquid in the liquid chamber from producing the phenomenon of revealing, and then the inflation effect of the elastic layer that has influenced the extrusion post outer wall and set up, further influenced the accurate positioning grafting effect of reference column.

Preferably, the upper side wall and the lower side wall of the liquid cavity are uniformly provided with clamping cavities, and the clamping cavities are obliquely arranged; a limiting cavity is formed in the extrusion strip, and a T-shaped inserting strip is arranged in the limiting cavity in a sliding mode through a spring; elastic clamping strips are arranged on the upper end face and the lower end face of the T-shaped inserting strip and are clamped into the clamping cavity in a sliding mode; the end part of the T-shaped cutting is positioned outside the extrusion strip; when the device works, when a detector needs to press the extrusion strip, the detector firstly presses the T-shaped insertion strip to enable the T-shaped insertion strip to be capable of shrinking in the box limiting cavity, elastic clamping strips at the upper end and the lower end of the T-shaped insertion strip can be separated from the clamping cavity, then the detector continuously presses the T-shaped insertion strip to drive the extrusion strip to shrink towards the liquid cavity, so that liquid can enter the expansion cavity, at the moment, the detector rotates the measuring column, and if the measuring column does not rotate in the pin hole, the detector loosens the T-shaped insertion strip to enable the elastic clamping strip to be continuously clamped into the clamping cavity, so that the extrusion strip is clamped and fixed, and the pin hole can be measured without the detector constantly pressing the extrusion strip; when the detection pin needs to be taken out, detection personnel continue to press the T-shaped inserting strip, so that the elastic clamping strip is separated from the clamping cavity, the extrusion strip is pulled outwards, liquid in the expansion cavity is pumped out by the elastic membrane, and then the measurement column is separated from the pin hole conveniently.

Preferably, a guide ring is fixedly arranged in the guide cavity, and a sealing ring is inserted on the guide ring in a sliding manner through a spring; guide holes are uniformly formed in the circumferential direction of the sealing ring, and the upper end face of the sealing ring is connected to the sliding ring through an elastic rope; the sliding ring is sleeved on the outer wall of the threaded column in a sliding mode; when the screw-thread column is connected into the screw-thread hole in a threaded manner, the outer wall of the screw-thread hole extrudes the sliding ring, so that the end part of the extrusion column of the sliding ring box slides, the sliding ring drives the sealing ring to be separated from the flow guide ring through the elastic rope 15, and then liquid flowing into the flow guide cavity flows into the expansion cavity through the guide hole and the flow guide ring, so that the elastic layer expands; when the threaded column breaks away from the threaded hole, the restoring force effect of spring can make the sealing ring insert in the water conservancy diversion ring down, and then through the cooperation of water conservancy diversion ring and sealing ring, can play sealed effect to the water conservancy diversion ring, when preventing that the threaded column from breaking away from the threaded hole, the remaining liquid in the inflation intracavity produces the phenomenon of revealing, and then influences the accurate use of measuring pin.

Preferably, an elastic layer is arranged on one side surface of the guide ring, and the elastic layer is in elastic extrusion contact with the sealing ring; a spring is arranged in the elastic layer; when the sealing ring is attached to the guide ring under the restoring force of the spring, the elastic layer arranged on the guide ring can play an elastic buffering role on the sealing ring, so that the phenomenon that the guide ring is separated from the guide cavity due to overlarge extrusion force of the sealing ring is prevented; meanwhile, the spring is arranged in the elastic layer, so that the guide ring and the sealing ring can be tightly attached to each other, and the sealing effect between the guide ring and the sealing ring is improved.

The invention has the following beneficial effects:

1. according to the invention, through the matching of the extrusion columns and the positioning columns, the extrusion columns with different diameters can extrude the positioning columns to slide out to the outer wall of the measuring column, so that at least one positioning column can form annular rings with different sizes on the outer wall of the measuring column, the measuring pin can measure pin holes with different sizes, and meanwhile, the positioning columns can form annular surface contact with the inner wall of the pin hole, thereby not only improving the measuring stability and accuracy of the measuring pin, but also improving the inserting stability of the measuring pin in the pin hole.

2. According to the invention, through the elastic layer arranged on the outer wall of the extrusion column, when liquid is filled in the expansion cavity, the expansion of the elastic layer can enable the positioning column forming the annular ring to be tightly attached into the pin hole, so that no gap exists between the measurement column and the pin hole after adjustment, the measurement pin cannot rotate, and the accurate auxiliary measurement effect of the measurement pin is further improved; when the liquid in the expansion cavity is drawn out, the elastic layer contracts, a certain gap is formed between the positioning column which forms the annular ring and the inner wall of the pin hole, the measuring column can be drawn out from the pin hole quickly, the phenomenon that the positioning column is abraded when the positioning column is used for a long time is reduced, the service life of the positioning column is influenced, and the use precision of the positioning column and the measuring column is influenced.

Drawings

The invention will be further explained with reference to the drawings.

FIG. 1 is a perspective view of the present invention;

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

FIG. 3 is an enlarged view of a portion of FIG. 2 in accordance with the present invention;

FIG. 4 is an enlarged view of a portion of the invention at B in FIG. 2;

in the figure: the device comprises a measuring pin head 1, a measuring column 2, an inserting cavity 21, a sliding cavity 22, a threaded hole 23, a limiting disc 3, a liquid cavity 31, a drainage hole 32, a clamping cavity 33, a limiting block 4, a positioning column 5, a limiting groove 51, an extrusion column 6, an expansion cavity 61, an elastic layer 62, a threaded column 7, a flow guide cavity 71, a drainage groove 72, an elastic membrane 8, an extrusion strip 9, a limiting cavity 91, a sealing disc 10, a T-shaped insertion strip 11, an elastic clamping strip 12, a flow guide ring 13, a sealing ring 14, a guide hole 141, an elastic rope 15 and a sliding ring 16.

Detailed Description

A camshaft pin hole expansion measuring pin according to an embodiment of the present invention will be described below with reference to fig. 1 to 4.

As shown in fig. 1-4, the camshaft pin hole expansion measuring pin comprises a measuring pin head 1 and a measuring column 2; one end part of the measuring column 2 is connected with a measuring pin head 1 through a limiting disc 3, and an inserting cavity 21 is formed in the other end of the measuring column 2; the outer wall of the circumference of the measuring column 2 is uniformly provided with sliding cavities 22, and at least 4 sliding cavities 22 are arranged; the measuring column 2 is spliced; the inner walls of two ends of the sliding cavity 22 are provided with limiting blocks 4, and the sliding cavity 22 is internally provided with positioning columns 5 in a sliding manner; limiting grooves 51 are formed in the outer walls of the two ends of the positioning column 5, limiting blocks 4 are arranged in the limiting grooves 51 in a sliding mode through springs, and the springs are located inside the measuring column 2; a threaded hole 23 is formed in one end of the measuring column 2, and the threaded hole 23 is located in the side wall of the limiting disc 3; an extrusion column 6 is inserted and extruded in the insertion cavity 21, and one end part of the extrusion column 6 is connected into a threaded hole 23 through a threaded column 7 in a threaded manner; the extrusion column 6 is in extrusion contact with a plurality of positioning columns 5 which are arranged on the measuring column 2 in a sliding way, and the other end part of the extrusion column 6 is positioned outside the measuring column 2;

when the device works, when a detector needs to perform expansion measurement on the pin hole of the camshaft, the detector can adjust the outer diameter corresponding to the measuring pin according to the inner diameter of the pin hole; at the moment, the manufacturers can correspondingly produce the extrusion columns 6 with different diameters; the detection personnel insert the extrusion column 6 with the corresponding diameter into the measuring column 2, the outer wall of the extrusion column 6 can extrude the positioning columns 5 to enable the positioning columns 5 to slide towards the outer wall of the measuring column 2, at the moment, the limiting block 4 can extrude the spring, the detection personnel can measure the outer ring distance between the two corresponding positioning columns 5 through the measuring scale, and simultaneously measure the distance between the other two corresponding positioning columns 5 to enable at least four sliding positioning columns 5 to form the inner diameter size corresponding to the pin hole outside the measuring column 2, then the detection personnel rotate the threaded column 7 at the end part of the extrusion column 6 to be connected into the threaded hole 23 in a threaded manner, further the sliding positioning columns 5 can be fixed through the extrusion column 6, then the detection personnel insert the measuring column 2 into the pin hole to enable the positioning columns 5 to form annular surfaces to be attached to the inner wall of the pin hole, and further enable the measuring column 2 to be tightly matched with the pin hole, the measuring column 2 can be stably inserted into the pin hole, and then a measuring person takes the pin head as the center to accurately measure the pin hole; through the matching of the extrusion columns 6 and the positioning columns 5, the extrusion columns 6 with different diameters can extrude the positioning columns 5 to slide out to the outer wall of the measuring column 2, so that at least 4 positioning columns 5 can form annular rings with different sizes on the outer wall of the measuring column 2, the measuring pin can measure pin holes with different sizes, and meanwhile, the positioning columns 5 can form annular surface contact with the inner wall of the pin holes, so that the measuring stability and accuracy of the measuring pin are improved, and the inserting stability of the measuring pin in the pin holes is improved; the existing measuring pin is also provided with a pin hole which can be suitable for pin holes with different sizes by adjusting the steel ball inside the measuring pin, and the measuring pin is easy to cause the phenomenon that the measuring pin is instable to be installed in the pin hole and poor in measuring precision because the steel ball inside the measuring pin is in point contact with the inner wall of the pin hole.

As an embodiment of the present invention, an expansion cavity 61 is opened on an outer circumferential wall of the extrusion column 6, and an outer wall of the expansion cavity 61 is an elastic layer 62; a diversion cavity 71 is formed in the threaded column 7, and the diversion cavity 71 is communicated with the expansion cavity 61; a liquid cavity 31 is formed in the limiting disc 3, and liquid is filled in the liquid cavity 31 through an elastic membrane 8; the side wall of the liquid cavity 31 is provided with a drainage hole 32, and the drainage hole 32 is communicated with the threaded hole 23; the extrusion strips 9 are uniformly arranged on the outer ring wall of the liquid cavity 31 in a sliding manner, and the sections of the extrusion strips 9 are of T-shaped structures; one end of the extrusion strip 9 is connected with the outer wall of the elastic membrane 8, and the other end of the extrusion strip 9 is positioned outside the limiting disc 3; when the measuring column 2 needs to be inserted into the pin hole, a detector can enable the size of an annular ring formed by the positioning columns 5 to rotate in the pin hole, so that the measuring column 2 can be rapidly inserted into the pin hole; then, a detection person can extrude the extrusion strip 9, so that the extrusion strip 9 contracts towards the inside of the liquid cavity 31, liquid filled in the elastic membrane 8 flows into the flow guide cavity 71 through the drainage hole 32 under the action of the extrusion force, then flows into the expansion cavity 61 through the flow guide cavity 71, and along with the continuous extrusion of the extrusion strip 9 by the detection person, the elastic layer 62 expands when the liquid enters the expansion cavity 61, so that the extrusion column 6 can continuously extrude the positioning column 5, so that the positioning column 5 forming the annular ring can be tightly attached to the pin hole, so that no gap exists between the adjusted measurement column 2 and the pin hole, the measurement pin cannot rotate, and the accurate auxiliary measurement effect of the measurement pin is further improved; meanwhile, if the measuring pin is taken out, a detector can pull the extrusion strip 9 outwards, the extrusion strip 9 can drive the elastic membrane 8 to draw out the liquid in the expansion cavity 61, so that the elastic layer 62 contracts, a certain gap is formed between the positioning column 5 forming the annular ring and the inner wall of the pin hole, the detector can quickly draw out the measuring column 2 from the pin hole, the friction force between the extended positioning column 5 and the pin hole is reduced, the positioning column 5 is abraded during long-time use, the service life of the positioning column 5 is influenced, and the use precision of the matching between the positioning column 5 and the measuring column 2 is influenced; if different measuring pins are adopted in the prior art, the measuring pins are easy to rub the pin holes when being extracted or inserted into the pin holes, so that the measuring pins are difficult to extract, and the service lives of the measuring pins are influenced; simultaneously through the distance between the steel ball of regulation for the cylinder can insert in the pinhole, and the steel ball can produce sliding friction with the inner wall in pinhole this moment, and then when the steel ball on the cylinder was used for a long time, can produce the phenomenon of wearing and tearing.

As an embodiment of the present invention, the end of the threaded column 7 is provided with a drainage groove 72; the end part of the drainage hole 32 is connected with a sealing disc 10 through a spring, and the sealing disc 10 rotates and is in extrusion contact with the end part of the threaded column 7; during operation, when the threaded column 7 at the end of the extrusion column 6 is in threaded connection with the threaded hole 23, the threaded column 7 can extrude the sealing disc 10 arranged at the end of the drainage hole 32, so that the sealing disc 10 opens the liquid cavity 31, then the detection personnel extrudes the extrusion strip 9, and liquid can flow into the flow guide cavity 71 through the drainage groove 72; after the squeeze column 6 breaks away from measuring post 2, sealed dish 10 can laminate the tip of drainage hole 32 under the restoring force of spring, and then be convenient for seal liquid chamber 31, prevent that the liquid in the liquid chamber 31 from producing the phenomenon of revealing, and then influenced the inflation effect of the elastic layer 62 that the outer wall of squeeze column 6 set up, further influenced the accurate positioning grafting effect of reference column 5.

As an embodiment of the present invention, the upper and lower sidewalls of the liquid chamber 31 are uniformly provided with a clamping chamber 33, and the clamping chamber 33 is obliquely disposed; a limiting cavity 91 is formed in the extrusion strip 9, and a T-shaped cutting strip 11 is arranged in the limiting cavity 91 in a sliding mode through a spring; elastic clamping strips 12 are arranged on the upper end face and the lower end face of the T-shaped inserting strip 11, and the elastic clamping strips 12 are clamped into the clamping cavity 33 in a sliding mode; the end part of the T-shaped cutting strip 11 is positioned outside the extrusion strip 9; when the device works, when a detector needs to press the extrusion strip 9, the detector firstly presses the T-shaped insertion strip 11, so that the T-shaped insertion strip 11 can contract in the box limiting cavity 91, meanwhile, the elastic clamping strips 12 at the upper end and the lower end of the T-shaped insertion strip 11 can be separated from the clamping cavity 33, then the detector continuously presses the T-shaped insertion strip 11 to drive the extrusion strip 9 to contract towards the liquid cavity 31, so that liquid can enter the expansion cavity 61, at the moment, the detector rotates the measuring column 2, if the measuring column 2 does not rotate in the pin hole, the detector loosens the T-shaped insertion strip 11, so that the elastic clamping strips 12 are continuously clamped into the clamping cavity 33, the extrusion strip 9 is clamped and fixed, and the pin hole can be measured without the detector always pressing the extrusion strip 9; when the detection pin needs to be taken out, a detector continuously presses the T-shaped inserting strip 11, so that the elastic clamping strip 12 is separated from the clamping cavity 33, the extrusion strip 9 is pulled outwards, the elastic membrane 8 is used for pumping out liquid in the expansion cavity 61, and the measurement column 2 is further separated from the pin hole conveniently.

As an embodiment of the present invention, a diversion ring 13 is fixedly disposed in the diversion cavity 71, and a sealing ring 14 is slidably inserted on the diversion ring 13 through a spring; guide holes 141 are uniformly formed in the circumferential direction of the sealing ring 14, and the upper end surface of the sealing ring 14 is connected to the sliding ring 16 through an elastic rope 15; the sliding ring 16 is slidably sleeved on the outer wall of the threaded column 7; during operation, when the threaded column 7 is screwed into the threaded hole 23, the outer wall of the threaded hole 23 extrudes the sliding ring 16, so that the sliding ring 16 slides on the end of the box extrusion column 6, the sliding ring 16 drives the sealing ring 14 to be separated from the flow guide ring 13 through the elastic rope 15, and then the liquid flowing into the flow guide cavity 71 flows into the expansion cavity 61 through the guide hole 141 and the flow guide ring 13, so that the elastic layer 62 is expanded; when the screw post 7 breaks away from in the screw hole 23, can make the sealing ring 14 insert in the water conservancy diversion ring 13 under the restoring force effect of spring, and then through the cooperation of water conservancy diversion ring 13 and sealing ring 14, can play sealed effect to water conservancy diversion ring 13, when preventing that screw post 7 from breaking away from in the screw hole 23, the phenomenon of revealing is produced to remaining liquid in the inflation chamber 61, and then influences the accurate use of measuring pin.

As an embodiment of the present invention, an elastic layer 62 is disposed on one side surface of the deflector ring 13, and the elastic layer 62 is in elastic pressing contact with the sealing ring 14; a spring is arranged inside the elastic layer 62; when the sealing ring 14 is attached to the guide ring 13 under the restoring force of the spring, the elastic layer 62 arranged on the guide ring 13 plays an elastic buffering role on the sealing ring 14, so that the phenomenon that the guide ring 13 is separated from the guide cavity 71 due to overlarge extrusion force of the sealing ring 14 is prevented; meanwhile, the spring is arranged in the elastic layer 62, so that the guide ring 13 and the sealing ring 14 can be tightly attached, and the sealing effect between the guide ring 13 and the sealing ring 14 is improved.

The specific working process is as follows:

when the device works, when a detector needs to perform expansion measurement on the pin hole of the camshaft, the detector can adjust the outer diameter corresponding to the measuring pin according to the inner diameter of the pin hole; at the moment, the manufacturers can correspondingly produce the extrusion columns 6 with different diameters; the detection personnel insert the extrusion column 6 with the corresponding diameter into the measuring column 2, the outer wall of the extrusion column 6 can extrude the positioning columns 5 to enable the positioning columns 5 to slide towards the outer wall of the measuring column 2, at the moment, the limiting block 4 can extrude the spring, the detection personnel can measure the outer ring distance between the two corresponding positioning columns 5 through the measuring scale, and simultaneously measure the distance between the other two corresponding positioning columns 5 to enable at least four sliding positioning columns 5 to form the inner diameter size corresponding to the pin hole outside the measuring column 2, then the detection personnel rotate the threaded column 7 at the end part of the extrusion column 6 to be connected into the threaded hole 23 in a threaded manner, further the sliding positioning columns 5 can be fixed through the extrusion column 6, then the detection personnel insert the measuring column 2 into the pin hole to enable the positioning columns 5 to form annular surfaces to be attached to the inner wall of the pin hole, and further enable the measuring column 2 to be tightly matched with the pin hole, so that the measuring column 2 can be stably inserted into the pin hole, and then the measuring personnel use the pin head as the center, thereby accurately measuring the pin hole.

In the description of the present invention, it is to be understood that the terms "center", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be taken as limiting the scope of the present invention.

While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from its scope. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.