Sealing detection mechanism for liquefied petroleum gas cylinder valve

Abstract

The present invention provides a sealing detection mechanism for a liquefied petroleum gas cylinder valve, and belongs to the field of mechanical technology. It solves the problem that the sealing detection mechanism of the existing liquefied petroleum gas cylinder valve is inefficient and the detection is not accurate enough. The sealing detection mechanism of the liquefied petroleum gas cylinder valve comprises a workbench, a bracket, an upper cylinder, a lower cylinder and an air inlet seat. The bracket is provided with a lifting mechanism 1. The cavity of the upper cylinder and the cavity of the lower cylinder can form a closed detection cavity. The cavity of the lower cylinder is used to place the liquefied petroleum gas cylinder valve. The lower cylinder is vertically penetrated on the workbench. The lower end of the lower cylinder has an air inlet. The upper cylinder is coaxially arranged with the air inlet seat. The bracket is provided with a lifting mechanism 2. A plug is provided in the upper cylinder. The upper cylinder is provided with a leak detector. The detection end of the leak detector is connected to the cavity of the upper cylinder. The sealing detection mechanism of the liquefied petroleum gas cylinder valve has the advantages of high detection efficiency and reliable detection.

Description

Technical Field

[0001] The invention belongs to the field of mechanical technology and relates to a sealing detection mechanism, in particular to a sealing detection mechanism for a liquefied petroleum gas cylinder valve. Background Art

[0002] The liquefied petroleum gas cylinder valve includes a valve body, a valve cap and a handle. The handle is connected to the valve cap, and the valve cap and the valve body are threadedly connected. Some liquefied petroleum gas cylinder valves are not of good quality. When the cylinder valve is open, liquefied petroleum gas is easy to leak out from the threaded connection between the valve cap and the valve body, causing safety accidents. Therefore, it is very important to detect the air tightness of the liquefied petroleum gas cylinder valve when it is opened. At present, the air tightness test of the liquefied petroleum gas cylinder valve when it is opened under high pressure usually adopts the immersion method, that is, the liquefied petroleum gas cylinder valve is placed in a water cylinder, and then the water cylinder is filled with water, and high-pressure gas is introduced into the valve through a pipe. It is observed whether there are bubbles coming out of the cylinder valve in the water cylinder, so as to judge the air tightness of the liquefied petroleum gas cylinder valve. This method has the following defects: 1. Due to the manual visual inspection method, workers are prone to visual fatigue and have a certain degree of subjectivity in judgment. Therefore, the measurement accuracy is not high; and it is impossible to complete the quantitative measurement of air tightness, and it is difficult to truly reflect the air tightness of the bottle valve, which is not conducive to the improvement of the production process; 2. Due to the different technical proficiency of the workers in the inspection workshop, the consistency of the air tightness of the tested bottle valves is poor, and the inspection workers need to face high-pressure gas operations, which is prone to safety accidents; 3. This manual inspection method is not conducive to production automation.

[0003] For example, a device for detecting air tightness when a liquefied petroleum gas cylinder valve is opened under high pressure disclosed in a Chinese patent document (application number: 201110255073.1) includes a frame, a sealing device provided with a sealing cavity for accommodating the liquefied petroleum gas cylinder valve, a pressing device for pressing the sealing device and the liquefied petroleum gas cylinder valve in the sealing device, a sensor for detecting the pressure difference in the sealing cavity of the sealing device, and a high-pressure gas device for passing high-pressure gas into the inner cavity of the liquefied petroleum gas cylinder valve in the sealing cavity; the sealing device is installed on the frame, the pressing device is installed on the frame and connected to the sealing device, the high-pressure gas device is connected to the sealing device, and the sensor is connected to the sealing cavity of the sealing device. However, the air tightness detection device is not efficient and the detection is not accurate enough, and there are safety hazards. Summary of the invention

[0004] The purpose of the present invention is to solve the above problems in the prior art and to provide a sealing detection mechanism for a liquefied petroleum gas cylinder valve with high detection efficiency and reliable detection.

[0005] The purpose of the present invention can be achieved through the following technical solutions: a sealing detection mechanism for a liquefied petroleum gas cylinder valve, comprising a workbench, a bracket, an upper cylinder, a lower cylinder and an air inlet seat, the bracket is provided with a lifting mechanism that can drive the upper cylinder to reciprocate and rise and fall, characterized in that the cavity of the upper cylinder and the cavity of the lower cylinder can form a closed detection cavity, the cavity of the lower cylinder is used to place the liquefied petroleum gas cylinder valve, the lower cylinder is vertically penetrated on the workbench, the lower end of the lower cylinder has an air inlet connected to the cavity of the lower cylinder, the upper cylinder The body is coaxially arranged with the air inlet seat, and the bracket is provided with a lifting mechanism 2 for driving the air inlet seat to reciprocate and rise and fall, and the lifting mechanism 2 can drive the air inlet seat to rise so that the air inlet seat is connected with the air inlet port of the lower cylinder, and a plug is provided in the upper cylinder, and the lifting mechanism 1 can drive the upper cylinder to move downward and abut against the lower cylinder and the plug abuts against the upper end of the valve body of the liquefied petroleum gas cylinder valve located in the cavity of the lower cylinder, and a leak detector is provided on the upper cylinder, and the detection end of the leak detector is connected with the cavity of the upper cylinder.

[0006] This workbench is a turntable of a liquefied petroleum gas cylinder valve assembly machine. During testing, the liquefied petroleum gas cylinder valve to be tested is vertically arranged in the cavity of the lower cylinder, and the lifting mechanism 2 drives the air inlet seat to move upward so that the air inlet seat abuts against the lower end of the lower cylinder, and then the lifting mechanism 1 drives the upper cylinder and the plug to move downward so that the plug blocks the upper end of the valve body of the liquefied petroleum gas cylinder valve, and the lower end of the upper cylinder abuts against the upper end of the lower cylinder. Compressed gas is introduced into the air inlet seat, and the compressed gas enters the valve body of the liquefied petroleum gas cylinder valve through the air inlet of the lower cylinder. When the liquefied petroleum gas cylinder valve leaks, the compressed gas enters the detection cavity, and the leak detector detects the compressed gas in the detection cavity, which has the advantages of high detection efficiency and reliable detection.

[0007] In the sealing detection mechanism of the liquefied petroleum gas cylinder valve, the lifting mechanism 1 includes a lifting cylinder 1 arranged on a bracket, and the piston rod of the lifting cylinder 1 is fixedly connected to the upper end of the upper cylinder. The upper cylinder is driven to lift and lower reciprocate by the lifting cylinder 1, which has the advantages of high working efficiency and simple structure. As another way, the lifting cylinder 1 is replaced by an oil cylinder. As a preferred method, the lifting mechanism 1 uses a motor and a screw rod and nut assembly.

[0008] In the sealing detection mechanism of the liquefied petroleum gas cylinder valve, a spring is provided between the plug and the upper cylinder, and the two ends of the spring respectively abut against the plug and the upper cylinder. By providing the spring, the lifting cylinder drives the lower cylinder and the plug to move downward, and after the plug abuts against the upper end of the valve body, the lifting cylinder drives the lower cylinder to continue to move downward and press against the lower cylinder, which has the advantages of simple structure and reliable and safe operation.

[0009] In the sealing detection mechanism of the liquefied petroleum gas cylinder valve, the lifting mechanism 2 includes a lifting cylinder 2 arranged on a bracket, and the piston rod of the lifting cylinder 2 is fixedly connected to the air inlet seat. The lifting cylinder 2 drives the air inlet seat to lift and lower, which has the advantages of high working efficiency and simple structure. As another way, the lifting cylinder 2 is replaced by an oil cylinder. As a preferred method, the lifting mechanism 2 uses a motor and a screw rod and nut assembly.

[0010] In the sealing detection mechanism of the liquefied petroleum gas cylinder valve, vertically arranged guide pillars are fixedly connected to both sides of the gas inlet seat, a guide sleeve is fixedly connected to the bracket and the guide pillar passes through the guide sleeve. By providing the guide pillar and the guide sleeve, the reciprocating lifting and lowering of the gas inlet seat has a better guiding effect, so that the detection can be carried out smoothly.

[0011] In the sealing detection mechanism of the liquefied petroleum gas cylinder valve, a pressure relief valve is fixedly connected to the upper cylinder and the pressure relief valve is in communication with the cavity of the upper cylinder. When the sealing performance of the liquefied petroleum gas cylinder valve does not meet the requirements, the pressure relief valve can prevent the pressure in the upper cylinder and the lower cylinder cavity from being too high, thereby improving safety.

[0012] In the sealing detection mechanism of the liquefied petroleum gas cylinder valve, a sealing gasket is provided at the upper end of the gas inlet seat and the lower end of the liquefied petroleum gas cylinder valve abuts against the sealing gasket. By providing the sealing gasket, the lower end of the lower cylinder can form a good seal with the gas inlet seat, which has the advantage of a good sealing effect.

[0013] In the sealing detection mechanism of the above-mentioned liquefied petroleum gas cylinder valve, a connecting joint is coaxially arranged in the cavity of the lower cylinder, an annular boss is arranged on the outer wall of the connecting joint, a connecting channel is arranged in the middle of the connecting joint, a sealing ring 1 is sleeved on the outer side of the connecting joint, and a sealing ring 2 and a sealing ring 3 are respectively embedded in the upper and lower end surfaces of the annular boss, the sealing ring 1 can be squeezed on the inner side wall of the valve body, the sealing ring 2 can be squeezed on the lower end surface of the valve body, and the sealing ring 3 can be squeezed on the inner side wall of the cavity of the lower cylinder.

[0014] In the sealing detection mechanism of the liquefied petroleum gas cylinder valve, the upper end of the upper cylinder is fixedly connected with a mounting seat, the upper end of the plug is coaxially provided with a guide column, the upper end of the guide column passes through the mounting seat, and a clamping ring is provided on the outer side of the guide column, and the clamping ring can be against the mounting seat. By providing the clamping ring, the plug can be prevented from falling off the upper cylinder, which has the advantages of convenient disassembly and assembly and reliable structure.

[0015] In the sealing detection mechanism of the liquefied petroleum gas cylinder valve, the upper end surface of the lower cylinder is provided with a sealing ring and the lower end surface of the upper cylinder can abut against the sealing ring. By providing the sealing ring, the upper cylinder and the lower cylinder can form a good seal, so that the detection can be carried out smoothly.

[0016] Compared with the prior art, the sealing detection mechanism of the liquefied petroleum gas cylinder valve has the following advantages:

[0017] 1. The liquefied petroleum gas cylinder valve is positioned in the detection cavity, and compressed gas is introduced into the gas inlet seat. The compressed gas enters the valve body of the liquefied petroleum gas cylinder valve through the gas inlet of the lower cylinder. When the liquefied petroleum gas cylinder valve leaks, the compressed gas enters the detection cavity, and the leak detector detects the compressed gas in the detection cavity, which has the advantages of high detection efficiency and reliable detection;

[0018] 2. By setting the above-mentioned spring, the lifting cylinder drives the lower cylinder and the plug to move downward. After the plug abuts against the upper end of the valve body, the lifting cylinder drives the lower cylinder to continue to move downward and press against the lower cylinder, which has the advantages of simple structure and reliable and safe operation;

[0019] 3. A pressure relief valve is fixedly connected to the upper cylinder and the pressure relief valve is communicated with the cavity of the upper cylinder. The pressure relief valve can prevent excessive pressure in the cavities of the upper cylinder and the lower cylinder, thereby improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the sealing detection mechanism of the liquefied petroleum gas cylinder valve.

[0021] Figure 2 yes Figure 1 A partial enlarged schematic diagram

[0022] In the figure, 1, workbench; 2, bracket; 3, upper cylinder; 4, lower cylinder; 4a, air inlet; 5, air inlet seat; 6, detection chamber; 7, plug; 7a, guide column; 8, leak detector; 9, lifting cylinder one; 10, spring; 11, lifting cylinder two; 12, guide column; 13, guide sleeve; 14, pressure relief valve; 15, sealing gasket; 16, connecting joint; 16a, annular boss; 16b, connecting channel; 17, sealing ring one; 18, sealing ring two; 19, sealing ring three; 20, mounting seat; 21, retaining ring; 22, sealing ring; 23, liquefied petroleum gas cylinder valve. DETAILED DESCRIPTION

[0023] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0024] like Figure 1 and 2As shown, the sealing detection mechanism of the liquefied petroleum gas cylinder valve includes a workbench 1, a bracket 2, an upper cylinder 3, a lower cylinder 4 and an air inlet seat 5. The bracket 2 is provided with a lifting mechanism 1 that can drive the upper cylinder 3 to reciprocate and rise and fall. The lifting mechanism 1 includes a lifting cylinder 1 9 arranged on the bracket 2, and the piston rod of the lifting cylinder 1 9 is fixedly connected to the upper end of the upper cylinder 3.

[0025] The upper end surface of the lower cylinder 4 is provided with a sealing ring 22 and the lower end surface of the upper cylinder 3 can be against the sealing ring 22, so that the upper cylinder 3 and the lower cylinder 4 can form a good seal. The cavity of the upper cylinder 3 and the cavity of the lower cylinder 4 can form a closed detection cavity 6. The lower cylinder 4 is vertically penetrated on the workbench 1. The lower end of the lower cylinder 4 has an air inlet 4a connected to the cavity of the lower cylinder 4. The upper cylinder 3 is coaxially arranged with the air inlet seat 5. The bracket 2 is provided with a lifting mechanism 2 that drives the air inlet seat 5 to reciprocate and lift. The lifting mechanism 2 can drive the air inlet seat 5 to rise so that the air inlet seat 5 is connected with the air inlet 4a of the lower cylinder 4. The lifting mechanism 2 includes a lifting cylinder 2 11 arranged on the bracket 2, and the piston rod of the lifting cylinder 2 11 is fixedly connected to the air inlet seat 5. The two sides of the air inlet seat 5 are fixedly connected with vertically arranged guide pillars 12, and the bracket 2 is fixedly connected with a guide sleeve 13 and the guide pillar 12 passes through the guide sleeve 13. A sealing gasket 15 is disposed at the upper end of the gas inlet seat 5 and the lower end of the liquefied petroleum gas cylinder valve 23 abuts against the sealing gasket 15 .

[0026] A plug 7 is provided in the upper cylinder 3, and a mounting seat 20 is fixedly connected to the upper end of the upper cylinder 3. A guide column 7a is coaxially provided at the upper end of the plug 7, and the upper end of the guide column 7a passes through the mounting seat 20. A snap ring 21 is provided on the outer side of the guide column 7a, and the snap ring 21 can abut against the mounting seat 20 to prevent the plug 7 from falling off the upper cylinder 3. A spring 10 is provided between the plug 7 and the upper cylinder 3, and the two ends of the spring 10 abut against the plug 7 and the mounting seat 20 respectively.

[0027] The lifting mechanism 1 can drive the upper cylinder 3 to move downward and abut against the lower cylinder 4, and the plug 7 abuts against the upper end of the valve body located in the cavity of the lower cylinder 4. A leak detector 8 is provided on the upper cylinder 3, and the detection end of the leak detector 8 is connected to the cavity of the upper cylinder 3. A pressure relief valve 14 is fixedly connected to the upper cylinder 3 and the pressure relief valve 14 is connected to the cavity of the upper cylinder 3.

[0028] A connecting joint 16 is coaxially provided in the cavity of the lower cylinder 4, and an annular boss 16a is provided on the outer side wall of the connecting joint 16. A connecting channel 16b is provided in the middle of the connecting joint 16. A sealing ring 17 is sleeved on the outer side of the connecting joint 16, and a sealing ring 2 18 and a sealing ring 3 19 are respectively embedded in the upper and lower end surfaces of the annular boss 16a. The sealing ring 17 can be squeezed on the inner side wall of the valve body, the sealing ring 2 18 can be squeezed on the lower end surface of the valve body, and the sealing ring 3 19 can be squeezed on the inner side wall of the lower cylinder 4.

[0029] The workbench 1 is a turntable of the assembly machine of the liquefied petroleum gas cylinder valve 23. During the test, the turntable drives the lower cylinder 4 to rotate to the lower side of the upper cylinder 3, and the liquefied petroleum gas cylinder valve 23 to be tested is vertically arranged in the lower cylinder 4. The lifting cylinder 2 11 drives the air inlet seat 5 to move upward so that the lower end of the lower cylinder 4 abuts against the sealing gasket 15 of the air inlet seat 5, and then the lifting cylinder 1 9 drives the upper cylinder 3 and the plug 7 to move downward so that the plug 7 blocks the upper end of the valve body of the liquefied petroleum gas cylinder valve 23, and the lower end of the upper cylinder 3 abuts against the sealing ring 22 of the lower cylinder 4. The upper end of the connecting joint 16 in the cavity of the lower cylinder 4 enters the lower end of the valve body and squeezes the sealing ring 1 17 to form a seal. The sealing ring 2 18 can be squeezed on the lower end face of the valve body, and the sealing ring 3 19 can be squeezed on the inner wall of the lower cylinder 4. Compressed gas is introduced into the air inlet seat 5, and the compressed gas enters the valve body of the liquefied petroleum gas cylinder valve 23 through the air inlet 4a of the lower cylinder 4 and the connecting channel 16b of the connecting joint 16. When the liquefied petroleum gas cylinder valve 23 leaks, the compressed gas enters the detection chamber 6, and the leak detector 8 detects the compressed gas in the detection chamber 6, which has the advantages of high detection efficiency and reliable detection. The leak detector 8 can be replaced by a pressure sensor. When the sealing performance of the liquefied petroleum gas cylinder valve 23 does not meet the requirements, the pressure relief valve 14 can prevent the pressure in the upper cylinder 3 and the lower cylinder 4 cavity from being too high, thereby improving safety.

[0030] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0031] Although the present invention uses more terms such as workbench 1, bracket 2, upper cylinder 3, lower cylinder 4, air inlet 4a, air inlet seat 5, detection chamber 6, plug 7, guide column 7a, leak detector 8, lifting cylinder 1 9, spring 10, lifting cylinder 2 11, guide column 12, guide sleeve 13, pressure relief valve 14, sealing gasket 15, connecting joint 16, annular boss 16a, connecting channel 16b, sealing ring 1 17, sealing ring 2 18, sealing ring 3 19, mounting seat 20, snap ring 21, sealing ring 22, liquefied petroleum gas cylinder valve 23, etc., it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A sealing detection mechanism for a liquefied petroleum gas cylinder valve, comprising a workbench (1), a bracket (2), an upper cylinder (3), a lower cylinder (4) and an air inlet seat (5), wherein the bracket (2) is provided with a lifting mechanism capable of driving the upper cylinder (3) to reciprocate and rise and fall, and characterized in that: The cavity of the upper cylinder (3) and the cavity of the lower cylinder (4) can form a closed detection cavity (6); the lower cylinder (4) is vertically arranged on the workbench (1); the lower end of the lower cylinder (4) has an air inlet (4a) connected to the cavity of the lower cylinder (4); the upper cylinder (3) and the air inlet seat (5) are coaxially arranged; the bracket (2) is provided with a lifting mechanism 2 for driving the air inlet seat (5) to reciprocate and rise and fall; the lifting mechanism 2 can drive the The air inlet seat (5) rises so that the air inlet seat (5) is connected to the air inlet (4a) of the lower cylinder (4); a plug (7) is provided in the upper cylinder (3); the lifting mechanism can drive the upper cylinder (3) to move downward and abut against the lower cylinder (4), and the plug (7) abuts against the upper end of the valve body located in the cavity of the lower cylinder (4); a leak detector (8) is provided on the upper cylinder (3), and the detection end of the leak detector (8) is connected to the cavity of the upper cylinder (3). A connecting joint (16) is coaxially arranged in the cavity of the lower cylinder (4), an annular boss (16a) is arranged on the outer wall of the connecting joint (16), a through-connecting passage (16b) is arranged in the middle of the connecting joint (16), a sealing ring (17) is sleeved on the outer side of the connecting joint (16), and a sealing ring (2) (18) and a sealing ring (3) (19) are respectively embedded in the upper and lower end surfaces of the annular boss (16a), and the sealing ring (17) can be squeezed on the inner wall of the valve body. The second sealing ring (18) can be pressed against the lower end surface of the valve body, the third sealing ring (19) can be pressed against the inner wall of the lower cylinder (4), the upper end of the upper cylinder (3) is fixedly connected with a mounting seat (20), the upper end of the plug (7) is coaxially provided with a guide column portion (7a), the upper end of the guide column portion (7a) passes through the mounting seat (20), and the outer side of the guide column portion (7a) is provided with a retaining ring (21), and the retaining ring (21) can be abutted against the mounting seat (20).

2. The sealing detection mechanism for a liquefied petroleum gas cylinder valve according to claim 1, characterized in that: The lifting mechanism 1 comprises a lifting cylinder 1 (9) arranged on a bracket (2), and the piston rod of the lifting cylinder 1 (9) is fixedly connected to the upper end of the upper cylinder (3).

3. The sealing detection mechanism for a liquefied petroleum gas cylinder valve according to claim 1, characterized in that: A spring (10) is provided between the plug (7) and the upper cylinder (3), and two ends of the spring (10) are respectively pressed against the plug (7) and the upper cylinder (3).

4. The sealing detection mechanism for a liquefied petroleum gas cylinder valve according to claim 1, characterized in that: The second lifting mechanism comprises a second lifting cylinder (11) arranged on a bracket (2), and a piston rod of the second lifting cylinder (11) is fixedly connected to the air inlet seat (5).

5. The sealing detection mechanism for a liquefied petroleum gas cylinder valve according to claim 1, 2, 3 or 4, characterized in that: Vertically arranged guide pillars (12) are fixedly connected to both sides of the air inlet seat (5), a guide sleeve (13) is fixedly connected to the bracket (2), and the guide pillar (12) passes through the guide sleeve (13).

6. The sealing detection mechanism for a liquefied petroleum gas cylinder valve according to claim 1, 2, 3 or 4, characterized in that: A pressure relief valve (14) is fixedly connected to the upper cylinder (3), and the pressure relief valve (14) is in communication with the cavity of the upper cylinder (3).

7. The sealing detection mechanism for a liquefied petroleum gas cylinder valve according to claim 1, 2, 3 or 4, characterized in that: The upper end of the air inlet seat (5) is provided with a sealing gasket (15), and the lower end of the liquefied petroleum gas cylinder valve abuts against the sealing gasket (15).

8. The sealing detection mechanism for a liquefied petroleum gas cylinder valve according to claim 1, 2, 3 or 4, characterized in that: The upper end surface of the lower cylinder (4) is provided with a sealing ring (22) and the lower end surface of the upper cylinder (3) can abut against the sealing ring (22).

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