Positioning fixture adopting airtightness detection

Abstract

The utility model provides a positioning fixture adopting airtightness detection, which is wide in application range and high in processing efficiency and safety stability. The device comprises an inverted T-shaped support plate, the support plate is provided with a clamping mechanism and an air tightness detection positioning mechanism, the air tightness detection positioning mechanism comprises a positioning pin structure, the positioning pin structure comprises a positioning pin seat and a positioning pin column, one end of the positioning pin seat far away from the positioning pin column is provided with a first counter bore, and the first counter bore is internally provided with an air tightness detection pin structure. The air tightness detection pin structure comprises an air tightness detection pin column and an air tightness detection pin seat, the outer diameter of the air tightness detection pin seat is matched with the inner diameter of the first counter bore, the thickness of the air tightness detection pin seat is smaller than the depth of the first counter bore, a receding groove is formed in the position, connected with the positioning pin seat, of the positioning pin column, and the air tightness detection pin column penetrates through the positioning pin seat and extends into the receding groove; a second counter bore is formed in the end, away from the airtightness detection pin column, of the airtightness detection pin seat, a blocking piece is installed at the end, away from the positioning pin column, of the positioning pin seat in a covering mode, and a spring is pressed between the blocking piece and the second counter bore.

Description

Technical Field

[0001] The novel tooling relates to the field of precision casting processing, and is specifically a positioning fixture using airtight detection. Background Art

[0002] In the processing of connector parts, it is usually used to position the end face of one side of the center hole of the connector and the center hole, and clamp the end face of the other side. This positioning method is simple in design and easy to manufacture, and is widely used. Most of these parts are mass-produced parts, so in most cases they are produced by automatic lines, and the mechanical grippers automatically load and pick up the materials. Since the accuracy of the mechanical grippers in placing and clamping the parts will affect the state of the parts clamped on the tooling, it is necessary to detect whether the parts are clamped in place to ensure that the automatic line can be produced safely and stably. For parts with a large flat surface as the positioning surface, the airtightness detection method is usually adopted, that is, an air detection hole is set in the positioning mechanism of the fixture to detect whether the positioning surface of the part directly seals the air detection hole of the positioning mechanism. If so, it is clamped in place, otherwise it is not clamped in place. However, if the positioning surface of the part is a blank surface or the area of ​​the positioning surface is very small, the positioning surface cannot directly seal the air detection hole, and airtightness detection cannot be performed, resulting in a narrow application range, low processing efficiency and poor safety and stability. Summary of the invention

[0003] In view of the shortcomings of the existing positioning fixture using airtight detection that cannot be used for parts whose positioning surfaces are blank surfaces or parts with very small positioning surfaces, resulting in a narrow application range, low processing efficiency and poor safety and stability, the utility model provides a positioning fixture using airtight detection, which can be used for parts whose positioning surfaces are blank surfaces or parts with very small positioning surfaces, has a wide application range, and high processing efficiency and safety and stability.

[0004] A positioning fixture using airtight detection, which includes an inverted T-shaped bracket plate, the bracket plate is installed with a clamping mechanism and an airtight detection positioning mechanism, characterized in that: the airtight detection positioning mechanism includes a positioning pin structure, the positioning pin structure includes a positioning pin seat and a positioning pin column, the positioning pin seat is provided with a first countersunk hole at one end away from the positioning pin column, the first countersunk hole is installed with an airtight detection pin structure, the airtight detection pin structure includes an airtight detection pin column and an airtight detection pin seat, the outer diameter of the airtight detection pin structure matches the inner diameter of the first countersunk hole, the thickness of the airtight detection pin seat is less than the depth of the first countersunk hole, and the positioning pin column is connected to the positioning pin seat. A clearance groove is provided at the end, and the airtight detection pin passes through the positioning pin seat and extends into the clearance groove; a second countersunk hole is provided at the end of the airtight detection pin seat away from the airtight detection pin, and a baffle is covered and installed at the end of the positioning pin seat away from the positioning pin, and a spring is pressed between the baffle and the second countersunk hole, when the spring is in a relaxed state, there is a gap between the airtight detection pin seat and the baffle, and when the spring is in a compressed state, the airtight detection pin seat is tightly attached to the baffle; an air detection hole perpendicular to the generatrix of the side wall of the positioning pin seat is provided on the side wall of the positioning pin seat at the end away from the positioning pin, and the air detection hole is connected to the first countersunk hole.

[0005] It is further characterized by:

[0006] The clamping mechanism includes a transverse clamping mechanism and a longitudinal clamping mechanism, the longitudinal clamping mechanism includes a first oil cylinder installed on the front end surface of the bracket plate, the piston rod of the first oil cylinder is retracted in a direction perpendicular to the vertical plate of the bracket plate, and the piston rod of the first oil cylinder is rotatably installed with a rotating pressure plate;

[0007] The transverse clamping mechanism comprises a positioning block installed on the front end surface of the bracket plate and a second oil cylinder installed on the rear end surface of the bracket plate, the extension direction of the piston rod of the second oil cylinder is parallel to the vertical plate of the bracket plate, the piston rod of the second oil cylinder clamps one end of the angular pressure plate, the angular pressure plate is rotatably installed on the bracket plate through a rotating shaft, the other end of the angular pressure plate extends out of the front end surface of the bracket plate, and the other end of the angular pressure plate and the positioning block form a transverse clamping of the parts;

[0008] There are three airtight detection pins, and three clearance grooves. The three airtight detection pins extend into the three clearance grooves respectively.

[0009] The number of combinations of the clamping mechanism and the airtight detection and positioning mechanism is two;

[0010] An oil circuit connecting the first oil cylinder and the second oil cylinder is provided in the support plate, and a speed regulating valve is installed in the oil circuit;

[0011] The front end surface of the bracket plate is provided with an air nozzle;

[0012] A lifting ring is installed on the top of the bracket plate.

[0013] After adopting the above-mentioned structure of the utility model, the part pushes the airtight detection pin structure during the positioning process, and the side wall surface of the airtight detection pin structure seals the air detection hole to realize airtight detection. The positioning surface indirectly seals the air detection hole, so that the positioning surface is a blank surface or a part with a very small positioning surface area can also complete airtight detection, which expands the scope of application and improves processing efficiency and safety and stability. The setting of the transverse clamping mechanism and the longitudinal clamping mechanism realizes the clamping of the parts from two different directions, further improving the processing efficiency and stability. The setting of the speed regulating valve realizes the control of the extension and retraction speed of the piston rods of the first oil cylinder and the second oil cylinder, further ensuring safety and stability. Two sets of clamping mechanisms and airtight detection positioning mechanisms are installed on the bracket plate, and two sets of processing can be carried out at the same time, greatly improving the processing efficiency. There are three airtight detection pins, which realizes the positioning surface of the part using the three-point positioning method instead of the entire surface positioning, so that the blank surface or the positioning surface with a small area can also complete the positioning, further improving the scope of application. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram of the main view of the utility model;

[0015] Figure 2 It is a schematic diagram of the utility model from a top view;

[0016] Figure 3 for Figure 1 A schematic diagram of the AA section view;

[0017] Figure 4 It is a structural schematic diagram of the airtight detection mechanism;

[0018] Figure 5 It is a schematic diagram of the clamping state of parts of the utility model. DETAILED DESCRIPTION

[0019] See Figures 1 to 5A positioning fixture using airtight detection, which includes an inverted T-shaped bracket plate 1, the bracket plate 1 is equipped with a clamping mechanism and an airtight detection positioning mechanism, and the combination number of the clamping mechanism and the airtight detection positioning mechanism is two; the airtight detection positioning mechanism includes a positioning pin structure 2, the positioning pin structure 2 includes a positioning pin seat 22 and a positioning pin column 21, and the end of the positioning pin seat 22 away from the positioning pin column 21 is provided with a first countersunk hole 23, and an airtight detection pin structure 3 is installed in the first countersunk hole 23, the airtight detection pin structure 3 includes three airtight detection pin columns 31 and an airtight detection pin seat 32, the outer diameter of the airtight detection pin seat 32 matches the inner diameter of the first countersunk hole 23, the thickness of the airtight detection pin seat 32 is less than the depth of the first countersunk hole 23, and the positioning pin column 21 is arranged with the positioning pin seat 22. Three makeshift grooves 24 are provided at the connection of the positioning pin seat 22, and three airtight detection pins 31 respectively pass through the positioning pin seat 22 and extend into the three makeshift grooves 24; a second countersunk hole 33 is provided at the end of the airtight detection pin seat 32 away from the airtight detection pin 31, and a baffle 8 is covered and installed on the end of the positioning pin seat 22 away from the positioning pin 21, and a spring 4 is pressed between the baffle 8 and the second countersunk hole 33. When the spring 4 is in a relaxed state, there is a gap between the airtight detection pin seat 32 and the baffle 8. When the spring 4 is in a compressed state, the airtight detection pin seat 32 is tightly attached to the baffle 8; an air inspection hole 25 perpendicular to the side wall generatrix of the positioning pin seat 22 is provided on the side wall surface of the positioning pin seat 22 at the end away from the positioning pin 21, and the air inspection hole 25 is connected to the first countersunk hole 23.

[0020] The clamping mechanism includes a transverse clamping mechanism and a longitudinal clamping mechanism. The longitudinal clamping mechanism includes a first oil cylinder 5 installed on the front end surface of the bracket plate 1. The extension direction of the piston rod of the first oil cylinder 5 is perpendicular to the vertical plate of the bracket plate 1. The piston rod of the first oil cylinder 5 is rotatably installed with a rotating pressure plate 6.

[0021] The transverse clamping mechanism includes a positioning block 7 installed on the front end surface of the bracket plate 1 and a second oil cylinder 9 installed on the rear end surface of the bracket plate 1. The extension direction of the piston rod of the second oil cylinder 9 is parallel to the vertical plate of the bracket plate 1. The piston rod of the second oil cylinder 9 clamps one end of the angular pressure plate 10. The angular pressure plate 10 is rotatably installed on the bracket plate 1 through a rotating shaft 11. The other end of the angular pressure plate 10 extends out of the front end surface of the bracket plate 1. The other end of the angular pressure plate 10 and the positioning block 7 form a transverse clamping of the part 15.

[0022] There are three airtight detection pins 31 and three clearance grooves 24. The three airtight detection pins 31 extend into the three clearance grooves 24 respectively, so that the positioning surface of the part can be positioned by the three-point positioning method.

[0023] An oil circuit connecting the first oil cylinder 5 and the second oil cylinder 9 is provided in the bracket plate 1, and a speed regulating valve 12 is installed in the oil circuit for adjusting the extension and retraction speed of the piston rods of the first oil cylinder 5 and the second oil cylinder 9;

[0024] The front end surface of the support plate 1 is provided with an air nozzle 13 for blowing away iron filings on the surface of the part 15;

[0025] A lifting ring 14 is installed on the top of the bracket plate 1 for easy installation.

[0026] The working process of the utility model is as follows:

[0027] Put part 15 into the main locating pin structure 2, rotate the rotary pressure plate 6 to the front of part 15, and then the piston rod of the first oil cylinder 5 contracts, driving the rotary pressure plate 6 to move backward to press the front end of part 15. If part 15 is positioned and clamped in place, the locating surface of part 15 is close to the top of the three locating pins 21, pushing the airtight locating pin structure 2 to move backward until the airtight locating pin structure 2 is close to the baffle 8 and completely blocks the air inspection hole 25, and the airtight test passes. Then the second oil cylinder 9 is started, and the piston rod of the second oil cylinder 9 is extended, driving the angular pressure plate 10 to press the top of part 15 laterally, and processing can start at this time; if part 15 is not positioned and clamped in place, the locating surface of part 15 cannot be close to the top of the three locating pins 21, and the airtight detection pin structure 3 cannot completely block the air inspection hole 25. The airtight test fails, the processing does not start, and the position of part 15 is readjusted.

[0028] After the processing is completed, the piston rods of the first oil cylinder 5 and the second oil cylinder 9 are restored to their original positions, the rotating pressure plate 6 and the angular pressure plate 10 are separated from the part 15, and then the part 15 is taken out, and the spring 4 rebounds to push the airtight detection pin structure 3 forward, so that the sealing surface of the airtight detection pin structure 3 is separated from the air detection hole 25. The processing is completed.

Claims

1. A positioning fixture using airtight detection, comprising an inverted T-shaped bracket plate, the bracket plate being equipped with a clamping mechanism and an airtight detection positioning mechanism, characterized in that: The airtight detection positioning mechanism includes a positioning pin structure, which includes a positioning pin seat and a positioning pin column. A first countersunk hole is provided at one end of the positioning pin seat away from the positioning pin column, and an airtight detection pin structure is installed in the first countersunk hole. The airtight detection pin structure includes an airtight detection pin column and an airtight detection pin seat. The outer diameter of the airtight detection pin seat matches the inner diameter of the first countersunk hole. The thickness of the airtight detection pin seat is less than the depth of the first countersunk hole. A yield groove is provided at the connection between the positioning pin column and the positioning pin seat. The airtight detection pin passes through the positioning pin seat and extends into the The airtight detection pin seat is provided with a second countersunk hole at one end away from the airtight detection pin column, and the end of the positioning pin seat is covered with a baffle, and a spring is pressed between the baffle and the second countersunk hole. When the spring is in a relaxed state, there is a gap between the airtight detection pin seat and the baffle, and when the spring is in a compressed state, the airtight detection pin seat is tightly attached to the baffle; the side wall surface of the positioning pin seat is provided with an air inspection hole perpendicular to the generatrix of the side wall surface of the positioning pin seat at the end away from the positioning pin column, and the air inspection hole is connected to the first countersunk hole.

2. A positioning fixture using airtight detection according to claim 1, characterized in that: The clamping mechanism includes a transverse clamping mechanism and a longitudinal clamping mechanism. The longitudinal clamping mechanism includes a first oil cylinder installed on the front end surface of the bracket plate. The extension direction of the piston rod of the first oil cylinder is perpendicular to the vertical plate of the bracket plate. The piston rod of the first oil cylinder is rotatably installed with a rotating pressure plate.

3. A positioning fixture using airtight detection according to claim 2, characterized in that: The transverse clamping mechanism includes a positioning block installed on the front end surface of the bracket plate and a second oil cylinder installed on the rear end surface of the bracket plate. The extension and retraction direction of the piston rod of the second oil cylinder is parallel to the vertical plate of the bracket plate. The piston rod of the second oil cylinder clamps one end of the angular pressure plate. The angular pressure plate is rotatably installed on the bracket plate through a rotating shaft. The other end of the angular pressure plate extends out of the front end surface of the bracket plate. The other end of the angular pressure plate and the positioning block constitute a transverse clamping of the parts.

4. A positioning fixture using airtight detection according to claim 1, characterized in that: The number of the airtight detection pins is three, the number of the clearance grooves is three, and the three airtight detection pins extend into the three clearance grooves respectively.

5. A positioning fixture using airtight detection according to claim 1 or 2, characterized in that: The number of combinations of the clamping mechanism and the airtight detection positioning mechanism is two.

6. The positioning fixture using airtight detection according to claim 3, characterized in that: An oil circuit connecting the first oil cylinder and the second oil cylinder is arranged in the support plate, and a speed regulating valve is installed in the oil circuit.

7. A positioning fixture using airtight detection according to claim 1 or 2, characterized in that: The front end surface of the bracket plate is equipped with an air nozzle.

8. A positioning fixture using airtight detection according to claim 1 or 2, characterized in that: A lifting ring is installed on the top of the bracket plate.

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