Airtight position monitoring assembly

Abstract

According to the air tightness position monitoring assembly matched with the oil cylinder, a clamping jaw at the head of the oil cylinder can press the assembly while pressing a workpiece, and when the clamping jaw is loosened, an internal spring (3) of the assembly can rebound, so that the whole movement process is completed; in the airtight position monitoring assembly, the inner core (2) axially does not rotate and slide in the body (1), when a workpiece is clamped to a specified position, the inner core (2) can block the air outlet hole (6) to achieve a required airtight environment, otherwise, air can be discharged from the air outlet hole, and a machine can give an early warning if the specified airtight value is not reached.

Description

Technical Field

[0001] The invention patent belongs to the field of air tightness monitoring, and more specifically, it relates to a novel cylinder assembly that detects the placement position of a workpiece on a fixture by checking the air tightness of the fixture. Background Art

[0002] In the process of placing the workpiece on the fixture, due to the non-standard of some blanks and the interference of the external environment, the workpiece cannot be completely placed in place, resulting in unqualified processing dimensions. Occasional unqualified dimensions are difficult to detect, which will cause individual unqualified parts to flow out and cause losses to the factory. Our factory uses an airtight method to detect whether the placement position of the workpiece on the fixture is qualified. The inner core structure of the original airtight position monitoring component installed on the cylinder is relatively simple. Each clamp presses the airtight position monitoring component while pressing the workpiece. Whether the airtight positioning pin will pass gas in different states, and whether the workpiece is clamped or loosened is determined by detecting the sealing value of the gas channel connected to it. This airtight position monitoring component can only determine whether the workpiece is clamped, and cannot detect the situation where it cannot be clamped in place even if it is clamped. Summary of the invention

[0003] The problem that the patent of this invention needs to solve is: by modifying the structure of the airtight position monitoring component, based on the determination of the airtight value, it is detected whether the clamping position reaches the specified value.

[0004] In order to solve the above problems, the following structural technical solutions are adopted:

[0005] The structure of the airtight position monitoring component consists of three parts: the main body, the positioning pin and the spring. The component is installed on the cylinder using threads. The upper jaw of the cylinder presses down and the spring rebounds. The gas enters the chamber of the main body from the air path of the fixture, flows through the through hole of the positioning pin, and exits from the side air hole. A screw hole is opened above the inner core, and a hexagonal bolt is installed to control the total length of the inner core. Two copper head nuts are added to the screw to prevent the screw from sliding. The inner core does not rotate or slide up and down inside the main body. The passage of gas determines the airtightness value of the system. The clamping position is determined by monitoring the airtightness value: the inner core is provided with three grooves, which can provide two gas channels. If the downward pressure position does not meet the regulations, the gas will pass through, and the system will issue an alarm because the airtightness value does not meet the requirements.

[0006] The following benefits can be obtained by using this structural technology solution:

[0007] Hexagonal bolts can adjust the length of the inner core and reduce the economic cost caused by wear. Adding two copper nuts can prevent the screws from sliding. The second boss is aligned with the air outlet, and the upper and lower grooves can be used for exhaust. When the fixture is clamped to the specified position, the system will display a certain air tightness value. If there is an upper and lower deviation in the position, the gas will flow out through the groove. By comparing the size of the air tightness value with the standard value, it is easier to infer the current position of the workpiece clamped by the clamp, effectively avoiding scrapping due to the workpiece not being clamped in place. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Description of the drawings in the specification:

[0009] Figure 1 Schematic diagram of the oil cylinder assembly of the patent of this invention

[0010] Figure 2 Structural diagram of the patent of this invention

[0011] Figure 3 Schematic diagram of the structure of the patent in the clamp open and under-positioned state

[0012] Figure 4 Schematic diagram of the structure of the invention in the clamping state

[0013] Figure 5 Schematic diagram of the structure of the clamp in the over-positioning clamping state of the patent of this invention

[0014] The markings in the attached drawings are: 1. body; 2. inner core; 3. spring; 4. chamber; 5. through hole; 6. air hole; 7. track; 8. screw; 9. copper head bolt; 10. positioning pin; 11. third boss; 12. third groove; 13. second boss; 14. second groove; 15. first boss; 16. first groove. DETAILED DESCRIPTION

[0015] Figure 1 This is a schematic diagram of the oil cylinder assembly. The air tightness position monitoring component is installed on the side of the oil cylinder and is installed using threads. A gap is left above the air outlet (6). The clamp presses the component while pressing the workpiece. After releasing, the spring at the bottom rebounds.

[0016] Figure 2The structure is a schematic diagram, the inner core (2) is installed with the positioning pin (10) and is installed into the main body (1) from the bottom, the positioning pin (10) is installed in the track (7), the chamfer of the first groove (16) is used to cooperate with the positioning of the inner core and limit the lower limit of the vertical sliding distance; the first boss (15) is shaped as a notched disc, which cooperates with the chamber and is used to limit the upper limit of the vertical sliding distance; the second boss (13) is shaped as a notched disc, and its thickness corresponds to the size of the air outlet. The error size is determined by the thickness of this boss, and the theoretical accuracy error can be zero; the third boss (10) has high requirements for cooperation with the inner wall of the main body (1), which needs to ensure the sealing of the gas and relative sliding, and plays a major role in axial movement and positioning.

[0017] Figure 3 This is a structural diagram of the fixture in the open and under-positioned state. When the fixture is not clamped or clamped into place, the gas in the detection component will flow out along the line shown in the figure. The airtightness requirement is not met and the machine will not work.

[0018] Figure 4 This is a schematic diagram of the structure of the fixture in a normal clamping state. The second boss (13) will block the air outlet, the interior is a sealed environment, and the machine works normally.

[0019] Figure 5 This is a structural diagram of the fixture in the over-positioning state. When the fixture is clamped to the over-position, the gas in the detection component will flow out through the line shown in the figure. The airtight requirement is not met and the machine will not work.

Claims

1. An air tightness position monitoring component for use with an oil cylinder, comprising a body (1), an inner core (2) and a spring (3). The body has a chamber (4), a through hole (5), a track (7) and an air hole (6); a screw (8) is installed on the top of the inner core, a positioning pin (10) is installed on the side; and a spring (3) is installed on the bottom. The inner core (2) moves up and down in the body (1).

2. The airtight position monitoring assembly according to claim 1, characterized in that: An air outlet hole (6) perpendicular to the inner core is provided in the middle.

3. The airtight position monitoring assembly according to claim 1, characterized in that: The top of the inner core (2) is provided with a screw (8), and the total length of the inner core can be adjusted by adding the screw (8), and the screw is locked by two copper head bolts (9).

4. The airtight position monitoring assembly according to claim 1, characterized in that: The inner core (2) is controlled to rotate on the body (1) by using the positioning pin (10) to slide on the track (7).

5. The airtight position monitoring assembly according to claims 1 and 4, characterized in that: The inner core (2) has three grooves (12) (14) (16) and three bosses (11) (13) (15). The inner core (2) slides in one direction without rotation along the center line of the through hole in the body (1).

6. The airtight position monitoring assembly according to claim 5, characterized in that: The diameter of the first boss (15) matches that of the chamber (4), and is a circular boss with a missing corner; the diameter of the second boss (13) matches that of the channel (5), and is a circular boss with a missing corner.

7. The airtight position monitoring assembly according to claim 5, characterized in that: The size of the second boss (13) can be modified by controlling the error range, and the theoretical error can be controlled to zero.

8. The airtight position monitoring assembly according to claim 3, characterized in that: The body (1) is installed by thread, and a section of thread is arranged below the air hole (6).

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