CN108592758B - A hole distance detection device - Google Patents

Abstract

The invention discloses a hole distance detection device, and belongs to the technical field of detection equipment. The angle measuring device comprises a lower ruler, a lower auxiliary ruler slide block mechanism, an upper ruler, an upper auxiliary ruler slide block mechanism, a central shaft and a transparent angle disc provided with angle scales; the lower ruler comprises a lower rectangular ruler plate, scales are arranged on the side wall of the lower rectangular ruler plate along the length direction of the lower rectangular ruler plate, a lower connecting column is fixedly connected to the left end of the top surface of the lower rectangular ruler plate, two lower ruler clamping strips parallel to the lower rectangular ruler plate are fixedly connected to the right side face of the lower connecting column at intervals from top to bottom in parallel, a lower ruler sliding groove is formed between the two lower ruler clamping strips, and a lower shaft seat is fixedly connected to the left side face of the lower connecting column. The invention has various functions, can realize the detection and measurement of the hole distance and the angle position relation among the three holes, the distance between the measuring hole and the side line and the like, does not need the cooperation of other detection devices, has accurate measurement and high positioning precision, and can greatly reduce the detection times, shorten the detection time and improve the working efficiency particularly for the detection of multiple holes.

Description

A hole distance detection device

technical field

The invention belongs to the technical field of detection equipment, and in particular relates to a hole distance detection device.

Background technique

In the manufacturing process of mechanical parts, it is necessary to measure and detect the distance between the holes machined on the parts. The existing hole distance measuring device has a relatively single function, and can only detect hole distance of a fixed distance, and cannot be used to directly measure hole distance; at the same time, it can only detect the distance between two holes, and parts with many holes are encountered. It needs to be tested one by one, the number of measurements is large, it takes a long time, and the efficiency is greatly reduced; when the positional relationship between the holes needs to be measured, it is usually necessary to cooperate with other devices such as a protractor to complete the work, and the work is cumbersome; when the distance between the two holes of the measuring part is large , the range of the small measuring device is insufficient; when the hole diameter to be detected is small, it is difficult to measure the distance between the two holes. Can not meet the needs of actual detection.

SUMMARY OF THE INVENTION

In order to solve the problem of the existing hole distance measuring device, the present invention has a relatively single function, and can only detect the hole distance of a fixed distance, and cannot be used to directly measure the hole distance; When there are many parts, they need to be inspected one by one, and the number of measurements is large, which takes a long time and greatly reduces the efficiency; when the positional relationship between the holes needs to be measured, it is usually necessary to cooperate with other devices such as a protractor to complete the work, which is cumbersome; when measuring two holes in a part When the distance is large, the range of the small measuring device is insufficient; when the hole diameter to be detected is small, it is difficult to measure the distance between the two holes. In order to solve the problem that the actual detection needs cannot be met, a hole distance detection device is provided.

In order to achieve the above purpose, the present invention adopts the following technical scheme: a hole distance detection device, which includes a lower ruler, a lower auxiliary ruler slider mechanism, an upper ruler, an upper auxiliary ruler slider mechanism, a central axis and a A transparent angle disc; the lower ruler includes a lower rectangular ruler plate, a scale is arranged on the side wall of the lower rectangular ruler plate along the length direction of the lower rectangular ruler plate, and a lower connecting column is fixedly connected to the left end of the top surface of the lower rectangular ruler plate, On the right side of the lower connecting column, two lower ruler clips parallel to the lower rectangular ruler plate are fixed in parallel from top to bottom at intervals, and a lower ruler chute is formed between the two lower ruler clips. A lower axle seat is fixed on the left side of the

The lower auxiliary ruler slider mechanism includes a lower auxiliary ruler reading slider and a lower auxiliary ruler measurement slider arranged in parallel at intervals, and a lower auxiliary ruler rib is connected in the middle of the lower auxiliary ruler reading slider and the middle of the lower auxiliary ruler measurement slider. The section of the slider mechanism of the lower auxiliary ruler is dumbbell-shaped, and a lower auxiliary ruler slot is formed between the lower auxiliary ruler reading slider and the lower auxiliary ruler measuring slider, and on both sides of the lower auxiliary ruler rib. There is a lower sub-scale scale on the side wall of the reading slider;

The upper ruler includes an upper rectangular ruler plate, the side wall of the upper rectangular ruler plate is provided with a scale along the length direction of the upper rectangular ruler plate, an upper connecting column is fixedly connected to the left end of the bottom surface of the upper rectangular ruler plate, Two upper ruler clips parallel to the upper rectangular ruler plate are fixed side by side from top to bottom on the right side, and an upper ruler chute is formed between the two upper ruler clips, which is on the left side of the upper connecting column. There is an upper axle seat fixed on the surface;

The upper and auxiliary ruler slider mechanism includes an upper auxiliary ruler reading slider and an upper auxiliary ruler measuring slider arranged in parallel at intervals, and an upper auxiliary ruler rib is connected between the middle part of the upper auxiliary ruler reading slider and the middle part of the upper auxiliary ruler measurement slider. , so that the section of the slider mechanism of the upper auxiliary ruler is dumbbell-shaped, and then an upper auxiliary ruler slot is formed between the upper auxiliary ruler reading slider and the upper auxiliary ruler measuring slider, and on both sides of the upper auxiliary ruler rib. The upper auxiliary ruler scale is set on the side wall of the upper auxiliary ruler reading slider;

The lower ruler and the upper ruler are symmetrically arranged, so that the lower ruler clip faces the upper ruler clip, the lower auxiliary ruler rib in the lower auxiliary ruler slider mechanism is placed in the lower ruler chute, and the two lower rulers in the lower ruler are placed in the lower ruler chute. The ruler card strips are placed in the lower auxiliary ruler card grooves on both sides of the lower auxiliary ruler rib; the upper auxiliary ruler rib in the upper auxiliary ruler slider mechanism is placed in the upper ruler chute, and the two upper rulers in the upper ruler The clips are placed in the upper and lower caliper grooves on both sides of the upper and lower rib plates; the lower half-conical boss is fixed on the edge of the lower auxiliary ruler measuring slider facing the upper ruler, and the upper and lower auxiliary ruler measuring slider faces downward. The edge of one side of the ruler is fixed with the upper half-cone boss, when the lower and upper auxiliary ruler measuring sliders are close together, the lower half-cone boss and the upper half-cone boss form a complete conical boss; The central shaft passes through the upper shaft seat, the lower shaft seat and the transparent angle disc in turn to connect the upper ruler, the lower ruler and the transparent angle disc.

Preferably, one end of the central shaft is provided with a central shaft conical boss, the other end of the central shaft is provided with an external thread, and a fastening nut is assembled on the external thread, and the central shaft on the side close to the central shaft conical boss The upper sleeve is provided with a spring, the upper ruler, the lower ruler and the transparent angle disc are sleeved on the central axis between the conical boss of the central axis and the tightening nut, and the transparent angle disc is placed on the side of the tightening nut, and the center The direction of the shaft cone boss is the same as that of the lower half cone boss and the upper half cone boss.

Preferably, a tightening device is assembled on the right ends of the two lower calipers, and a tightening device is assembled on the right ends of the two upper calipers; each of the tightening devices includes a bottom plate, which is fixedly connected to one side of the bottom plate. There is a screw hole plate and a tightening rib perpendicular to the middle of the screw hole plate. There is a threaded hole equipped with a tightening bolt on the screw hole plate on both sides of the tightening rib, and the tightening rib on each tightening device is placed in the corresponding In the lower chute or upper chute of the lower ruler, each tightening bolt on the tightening device is tightened with the corresponding screw hole on the right end of the lower ruler or the right end of the upper ruler.

Preferably, a lower auxiliary ruler convex block is provided on the side of the lower auxiliary ruler reading slider facing the upper ruler, and an upper auxiliary ruler concave is provided on the side of the upper auxiliary ruler reading slider facing the lower ruler at the position corresponding to the position of the lower auxiliary ruler convex block groove.

Preferably, the lower auxiliary ruler reading slider is provided with a fastening screw hole that communicates with the lower auxiliary ruler caliper and is equipped with a lower auxiliary ruler fastening bolt in the fastening screw hole; the upper auxiliary ruler reading slider is provided with a connection to the upper ruler The fastening screw holes of the auxiliary ruler slot are equipped with upper auxiliary ruler fastening bolts in the fastening screw holes.

The beneficial effects of the present invention are:

The invention has various functions, and can realize the simultaneous detection of the hole distance between the three holes, the angular position relationship, and the distance between the measurement hole and the edge, etc., without the cooperation of other detection devices, accurate measurement and high positioning accuracy, especially for porous Detection can greatly reduce the number of detections, shorten the detection time, improve work efficiency, and meet the needs of actual use.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the present invention;

Fig. 2 is the structural representation of lower ruler and upper ruler;

Figure 3 is a schematic structural diagram of the lower auxiliary ruler slider mechanism and the upper auxiliary ruler slider mechanism;

Fig. 4 is the structural representation of the central axis;

Fig. 5 is the structural representation of the tightening device;

Fig. 6 is the structural schematic diagram after the hole distance detection device of the present invention is fully unfolded;

Fig. 7 is the use state structure schematic diagram when utilizing this hole distance detection device to measure the positional relationship of three holes;

FIG. 8 is a schematic view of the structure in use when measuring the distance between a hole and a certain edge line by using the hole distance detection device.

Detailed ways

It should be noted here that the terms left, right, front, back, etc. are all defined based on the view shown in FIG. 1 , and it should be understood that the use of the terms of orientation should not limit the protection claimed in this application scope.

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

As shown in Figures 1 to 5, a hole distance detection device includes a lower ruler 1, a lower auxiliary ruler slider mechanism 2, an upper ruler 5, an upper auxiliary ruler slider mechanism 6, a central axis 8 and an angle scale provided with The transparent angle disc 7; the lower ruler 1 includes a lower rectangular ruler plate 1a, the side wall of the lower rectangular ruler plate 1a is provided with a scale along the length direction of the lower rectangular ruler plate 1a, and the left end of the top surface of the lower rectangular ruler plate 1a is provided with a scale. A lower connecting column 1b is fixed, and two lower ruler clips 1c parallel to the lower rectangular ruler plate 1a are fixed on the right side of the lower connecting column 1b from top to bottom at intervals. A lower ruler chute 1d is formed between 1c, and a lower axle seat 1e is fixed on the left side of the lower connecting column 1b;

The lower auxiliary ruler slider mechanism 2 includes a lower auxiliary ruler reading slider 2a and a lower auxiliary ruler measurement slider 2b arranged in parallel at intervals. The auxiliary ruler rib 2c makes the section of the lower auxiliary ruler slider mechanism 2 be dumbbell-shaped, and further forms between the lower auxiliary ruler reading slider 2a and the lower auxiliary ruler measuring slider 2b, and on both sides of the lower auxiliary ruler rib 2c. A lower auxiliary ruler slot 2d, and a lower auxiliary ruler scale 2e is arranged on the side wall of the lower auxiliary ruler reading slider 2a;

Described upper ruler 5 comprises upper rectangular ruler plate 5a, the side wall of upper rectangular ruler plate 5a is provided with scale along the length direction of upper rectangular ruler plate 5a, and the left end of the bottom surface of upper rectangular ruler plate 5a is fixedly connected with upper connecting column 5b. On the right side of the upper connecting column 5b, two upper ruler clips 5c parallel to the upper rectangular ruler plate 5a are fixed side by side from top to bottom at intervals, and an upper ruler is formed between the two upper ruler clips 5c. The chute 5d is fixedly connected with the upper axle seat 5e on the left side of the upper connecting column 5b;

The upper auxiliary ruler slider mechanism 6 includes an upper auxiliary ruler reading slider 6a and an upper auxiliary ruler measuring slider 6b arranged in parallel at intervals, and a middle part of the upper auxiliary ruler reading slider 6a and the upper auxiliary ruler measuring slider 6b are connected with the middle part. The upper auxiliary ruler rib 6c makes the section of the upper auxiliary ruler slider mechanism 6 be dumbbell-shaped, and then between the upper auxiliary ruler reading slider 6a and the upper auxiliary ruler measuring slider 6b, on both sides of the upper auxiliary ruler rib 6c Each is formed with an upper auxiliary ruler catching slot 6d, and an upper auxiliary ruler scale 6e is provided on the side wall of the upper auxiliary ruler reading slider 6a;

The lower ruler 1 and the upper ruler 5 are symmetrically arranged, so that the lower ruler clip 1c faces the upper ruler clip 5c, and the lower auxiliary ruler rib 2c in the lower auxiliary ruler slider mechanism 2 is placed in the lower ruler chute 1d, The two lower ruler clips 1c in the lower ruler 1 are placed in the lower auxiliary ruler card slots 2d on both sides of the lower auxiliary ruler rib 2c; the upper auxiliary ruler rib 6c in the upper auxiliary ruler slider mechanism 6 is placed on the upper In the ruler chute 5d, the two upper ruler clips 5c in the upper ruler 5 are clamped and placed in the upper auxiliary ruler slot 6d on both sides of the upper auxiliary ruler rib 6c; the lower auxiliary ruler measuring slider 2b faces the side of the upper ruler 5. A lower half-cone boss 2f is fixedly connected to the edge of the upper and lower half-cone bosses 2f, and an upper half-cone boss 6f is fixedly connected to the edge of the upper auxiliary ruler measuring slider 6b facing the lower ruler 1 side, and the lower auxiliary ruler measuring slider 2b measures with the upper auxiliary ruler. When the sliders 6b are close together, the lower half-cone boss 2f and the upper half-cone boss 6f form a complete conical boss; the central shaft 8 passes through the upper shaft seat 5e, the lower shaft seat 1e and the transparent angle disc 7 in turn Connect the upper ruler 5, lower ruler 1 and transparent angle disc 7.

On the basis of the above technical solution, as shown in FIG. 4 , one end of the central shaft 8 is provided with a central shaft conical boss 8a, the other end of the central shaft 8 is provided with an external thread 8b, and a tightening screw is assembled on the external thread 8b. The fixing nut 8c is fitted with a spring 8d on the central shaft 8 on the side close to the central shaft conical boss 8a. On the central axis 8 between the nuts 8c, and make the transparent angle disc 7 close to the side of the tightening nut 8c, the direction of the central axis conical boss 8a is the same as the direction of the lower semi-conical boss 2f and the upper semi-conical boss 6f same. In this way, as shown in Figure 6, when measuring the hole distance of two holes, in order to increase the range, rotate the lower ruler 1 and the upper ruler 5 to 180° around the central axis 8, and the lower ruler 1 and the upper ruler 5 are in a straight line. , and retract the spring 8d and the central axis cone boss 8a into the upper shaft seat 5e and the lower shaft seat 1e, insert the lower half-cone boss 2f and the upper half-cone boss 6f into the two holes to be detected respectively for measurement. One end of the spring 8d is pressed against the central axis conical boss 8a, and the other end of the spring 8d is pressed against the transparent angle disc 7. After the measurement is completed, the spring 8d pops out the central axis conical boss 8a again.

On the basis of the above technical solution, as shown in Figure 1, Figure 2 and Figure 5, a tightening device 3 is installed on the right ends of the two lower calipers 1c, and a tightening device 3 is installed on the right ends of the two upper calipers 5c Device 3; each of the tightening devices 3 includes a bottom plate 3a, on one side of the bottom plate 3a is fixed a screw hole plate 3b and a tightening rib 3c perpendicular to the middle of the screw hole plate 3b, and on both sides of the screw hole plate 3c Each of the screw hole plates 3b is provided with a threaded hole equipped with a tightening bolt 3d, and the tightening rib 3c on each tightening device 3 is placed in the corresponding lower ruler chute 1d or upper ruler chute 5d. Each tightening bolt 3d is tightened with the corresponding screw hole provided at the right end of the lower ruler clip 1c or the right end of the upper ruler clip 5c. In this way, the two lower ruler clips 1c and the two upper ruler clips 5c are tightened and fixed by the tightening device 3, and at the same time, the lower auxiliary ruler slider mechanism 2 is restricted in the lower ruler chute 1d, and the upper auxiliary ruler slider mechanism 6 Restricted in the upper ruler chute 5d to avoid falling off.

On the basis of the above technical solution, as shown in FIG. 3 , the lower auxiliary ruler protrusion 2k is provided on the side of the lower auxiliary ruler reading slider 2a facing the upper ruler 5 , and the upper auxiliary ruler reading slider 6a is on the side facing the lower ruler 1 . An upper auxiliary ruler groove 6k is provided at a position corresponding to the position of the lower auxiliary ruler convex block 2k. In this way, when the lower ruler 1 and the upper ruler 5 are closed, the lower auxiliary ruler projection 2k on the lower auxiliary ruler slider mechanism 2 is clamped into the upper auxiliary ruler groove 6k on the upper auxiliary ruler slider mechanism 6, and the lower auxiliary ruler is fixed. The auxiliary ruler slider mechanism 2 is integrated with the upper auxiliary ruler slider mechanism 6, which improves the stability and reliability and meets the needs of use.

On the basis of the above technical solution, as shown in FIG. 3 , the lower auxiliary ruler reading slider 2a is provided with a fastening screw hole that communicates with the lower auxiliary ruler caliper slot 2d and is equipped with a lower auxiliary ruler fastening bolt in the fastening screw hole 2h; the upper auxiliary ruler reading slider 6a is provided with a fastening screw hole connected to the upper auxiliary ruler caliper 6d, and the upper auxiliary ruler fastening bolt 6h is provided in the fastening screw hole. In this way, when the positions of the lower auxiliary ruler reading slider 2a and the upper auxiliary ruler reading slider 6a are adjusted, they are respectively fixed by the lower auxiliary ruler fastening bolts 2h and the upper auxiliary ruler fastening bolts 6h to avoid movement. meet the needs of use.

The working principle of the hole distance detection device of the present invention is as follows:

1. Detect the distance between the two holes: rotate the lower ruler 1 and the upper ruler 5 around the central axis 8, and close the lower ruler 1 and the upper ruler 5, so that the lower auxiliary ruler protrusion 2k on the lower auxiliary ruler slider mechanism 2 is locked Put it into the upper auxiliary ruler groove 6k on the upper auxiliary ruler slider mechanism 6, and fix the lower auxiliary ruler slider mechanism 2 and the upper auxiliary ruler slider mechanism 6 into one. It is fixed with the upper foot 5. Move the lower auxiliary ruler slider mechanism 2 and the upper auxiliary ruler slider mechanism 6, through the main scales on the lower ruler 1, the upper ruler 5 and the auxiliary scales on the lower auxiliary ruler slider mechanism 2 and the upper auxiliary ruler slider mechanism 6, Accurately locate the size required by the inspection, then tighten the lower auxiliary ruler fastening bolts 2h and the upper auxiliary ruler fastening bolts 6h respectively, and fix the position of the lower auxiliary ruler slider mechanism 2 on the lower ruler 1 and the upper auxiliary ruler slider mechanism 6 The position on the upper foot 5. Insert the central axis conical boss 8a into a hole to be tested, insert the integrated lower half-cone boss 2f and the upper half-cone boss 6f into the other hole to be tested, and check whether the distance between the two holes meets the requirements or read two. Actual hole spacing between holes.

2. Detect the distance between the three holes: as shown in Figure 7, loosen the fastening nut 8c on the central axis 8, rotate the lower ruler 1 and the upper ruler 5 around the central shaft 8, and separate the lower ruler 1 from the upper ruler 5 , slide the auxiliary ruler slider mechanism 2 on the lower ruler 1, through the main scale on the lower ruler 1 and the auxiliary scale on the auxiliary ruler slider mechanism 2, accurately locate the required size of the first hole to be detected, and then tighten Tighten the bolts of the lower auxiliary ruler 2h; slide the upper auxiliary ruler slider mechanism 6 on the upper ruler 5, through the main scale on the upper ruler 5 and the auxiliary scale on the upper auxiliary ruler slider mechanism 6, accurately locate the second To the required size of the hole to be detected, then tighten the upper auxiliary ruler fastening bolt 6h. Then insert the central axis cone boss 8a on the central shaft 8 into the third hole to be detected, the lower half-conical boss 2f into the first hole to be detected, and the upper half-conical boss 6f into the second hole to be detected Inside, check whether the distance of the three holes meets the requirements or read the actual hole distance between the three holes.

3. Detect the positional relationship between the holes: 1. As shown in Figure 7, detect the positional relationship between one hole and the other two holes, loosen the tightening nut 8c on the central axis 8, and rotate around the central axis 8. Ruler 1 and upper ruler 5, separate the lower ruler 1 from the upper ruler 5, slide the lower auxiliary ruler slider mechanism 2 on the lower ruler 1, slide the upper auxiliary ruler slider mechanism 6 on the upper ruler 5, and then tighten the lower auxiliary ruler respectively. The ruler fastening bolts 2h and the upper auxiliary ruler fastening bolts 6h fix the position of the lower auxiliary ruler slider mechanism 2 on the lower ruler 1 and the position of the upper auxiliary ruler slider mechanism 6 on the upper ruler 5. Then insert the upper semi-conical boss 6f on the slider mechanism 6 of the upper auxiliary ruler into the first hole to be detected, and insert the conical boss 8a of the central axis on the central axis 8 and the lower half of the slider mechanism 2 of the lower auxiliary ruler The conical bosses 2f are respectively inserted into the other two holes to be measured, and the tightening nut 8c is tightened to measure the angle between the upper ruler 5 and the lower ruler 1 through the transparent angle disc 7, that is, the to-be-measured hole and the known two holes. The angular relationship between them, cooperate with the upper ruler 5 and the upper auxiliary ruler slider mechanism 6 to obtain the corresponding hole distance, and finally determine the position of the hole to be measured.

2. As shown in Figure 8, detect the distance between a hole and a certain edge: loosen the fastening nut 8c on the central axis 8, rotate the lower ruler 1 and the upper ruler 5 around the central axis 8, and make the lower ruler 1 and the upper ruler 5. Separate, adjust the upper ruler 5 and the lower ruler 1 at the same time, set the included angle to 90° through the transparent angle disc 7, tighten the tightening nut 8c on the central axis 8, and fit the lower ruler 1 on the side line to be measured, Move the upper auxiliary ruler slider mechanism 6 on the upper ruler 5 so that the upper semi-conical boss 6f on the upper auxiliary ruler slider mechanism 6 is inserted into the hole to be detected, and then fix the upper auxiliary ruler on the upper auxiliary ruler slider mechanism 6 Tighten the bolts for 6h, and read the reading of the upper ruler 5, that is, the distance between the hole to be measured and the edge to be measured.

To limit the protection scope of the present invention, those skilled in the art should understand that, on the basis of the technical solutions of the present invention, various modifications or deformations that can be made by those skilled in the art without creative work are still within the protection scope of the present invention. within.

Claims (5)

1. A pitch-row detection device is characterized in that: the angle measuring device comprises a lower ruler, a lower auxiliary ruler slide block mechanism, an upper ruler, an upper auxiliary ruler slide block mechanism, a central shaft and a transparent angle disc provided with angle scales; the lower ruler comprises a lower rectangular ruler plate, scales are arranged on the side wall of the lower rectangular ruler plate along the length direction of the lower rectangular ruler plate, a lower connecting column is fixedly connected to the left end of the top surface of the lower rectangular ruler plate, two lower ruler clamping strips parallel to the lower rectangular ruler plate are fixedly connected to the right side surface of the lower connecting column in parallel at intervals from top to bottom, a lower ruler sliding groove is formed between the two lower ruler clamping strips, and a lower shaft seat is fixedly connected to the left side surface of the lower connecting column;

the lower auxiliary ruler sliding block mechanism comprises a lower auxiliary ruler reading sliding block and a lower auxiliary ruler measuring sliding block which are arranged in parallel at intervals, and lower auxiliary ruler rib plates are connected to the middle part of the lower auxiliary ruler reading sliding block and the middle part of the lower auxiliary ruler measuring sliding block, so that the cross section of the lower auxiliary ruler sliding block mechanism is dumbbell-shaped, a lower auxiliary ruler clamping groove is formed between the lower auxiliary ruler reading sliding block and the lower auxiliary ruler measuring sliding block and on two sides of each lower auxiliary ruler rib plate, and lower auxiliary ruler scales are arranged on the side wall of the lower auxiliary ruler reading sliding block;

the upper ruler comprises an upper rectangular ruler plate, scales are arranged on the side wall of the upper rectangular ruler plate along the length direction of the upper rectangular ruler plate, an upper connecting column is fixedly connected to the left end of the bottom surface of the upper rectangular ruler plate, two upper ruler clamping strips parallel to the upper rectangular ruler plate are fixedly connected to the right side surface of the upper connecting column in parallel at intervals from top to bottom, an upper ruler sliding groove is formed between the two upper ruler clamping strips, and an upper shaft seat is fixedly connected to the left side surface of the upper connecting column;

the upper auxiliary ruler sliding block mechanism comprises an upper auxiliary ruler reading sliding block and an upper auxiliary ruler measuring sliding block which are arranged in parallel at intervals, and an upper auxiliary ruler rib plate is connected to the middle part of the upper auxiliary ruler reading sliding block and the middle part of the upper auxiliary ruler measuring sliding block, so that the section of the upper auxiliary ruler sliding block mechanism is dumbbell-shaped, an upper auxiliary ruler clamping groove is formed between the upper auxiliary ruler reading sliding block and the upper auxiliary ruler measuring sliding block and on two sides of the upper auxiliary ruler rib plate respectively, and upper auxiliary ruler scales are arranged on the side wall of the upper auxiliary ruler reading sliding block;

the lower ruler and the upper ruler are symmetrically arranged, so that the lower ruler clamping strips are opposite to the upper ruler clamping strips, a lower auxiliary ruler rib plate in the lower auxiliary ruler sliding block mechanism is arranged in a lower ruler sliding groove, and two lower ruler clamping strips in the lower ruler are clamped in lower auxiliary ruler clamping grooves on two sides of the lower auxiliary ruler rib plate; an upper auxiliary ruler rib plate in the upper auxiliary ruler sliding block mechanism is arranged in an upper ruler sliding groove, and two upper ruler clamping strips in the upper ruler are clamped in upper auxiliary ruler clamping grooves on two sides of the upper auxiliary ruler rib plate; the edge of one side, facing the upper ruler, of the lower auxiliary ruler measuring slide block is fixedly connected with a lower semi-conical boss, the edge of one side, facing the lower ruler, of the upper auxiliary ruler measuring slide block is fixedly connected with an upper semi-conical boss, and when the lower auxiliary ruler measuring slide block and the upper auxiliary ruler measuring slide block are closed together, the lower semi-conical boss and the upper semi-conical boss form a complete conical boss; the central shaft sequentially penetrates through the upper shaft seat, the lower shaft seat and the transparent angle disc to connect the upper ruler, the lower ruler and the transparent angle disc.

2. The pitch detection device of claim 1, wherein: the one end of center pin is provided with center pin circular cone boss, has seted up the external screw thread on the other end of center pin, and is equipped with fastening nut on the external screw thread, and the cover is equipped with the spring on the center pin that is close to center pin circular cone boss one side, go up chi, lower chi and transparent angle disc suit on the center pin between center pin circular cone boss and fastening nut to make transparent angle disc lean on to fastening nut one side, the directive of center pin circular cone boss is the same with the directive of semicircle cone boss, last semicircle cone boss down.

3. The pitch detection device of claim 2, wherein: the right ends of the two lower ruler clamping strips are provided with a tightening device, and the right ends of the two upper ruler clamping strips are provided with a tightening device; each screwing device comprises a bottom plate, a screw hole plate and a screwing rib plate perpendicular to the middle of the screw hole plate are fixedly connected to one side face of the bottom plate, a screw hole provided with a screwing bolt is formed in each of the screw hole plates on two sides of each screwing rib plate, the screwing rib plate on each screwing device is arranged in the corresponding lower ruler sliding groove or the corresponding upper ruler sliding groove, and each screwing bolt on each screwing device is screwed and matched with the screw hole formed in the right end of the corresponding lower ruler clamping strip or the right end of the corresponding upper ruler clamping strip.

4. A pitch detection device according to claim 3, wherein: a lower auxiliary ruler convex block is arranged on one side surface of the lower auxiliary ruler reading slide block facing the upper ruler, and an upper auxiliary ruler groove is arranged at the position corresponding to the lower auxiliary ruler convex block on one side surface of the upper auxiliary ruler reading slide block facing the lower ruler.

5. The pitch detection device of claim 4, wherein: a fastening screw hole communicated with the lower auxiliary ruler clamping groove is formed in the lower auxiliary ruler reading sliding block, and a lower auxiliary ruler fastening bolt is arranged in the fastening screw hole; and a fastening screw hole communicated with the upper auxiliary ruler clamping groove is formed in the upper auxiliary ruler reading sliding block, and an upper auxiliary ruler fastening bolt is arranged in the fastening screw hole.

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