A tool for testing the flatness of the sealing surface of a large-diameter gate valve seat

Abstract

The present invention belongs to the technical field of flatness detection, and specifically relates to a tool for detecting the flatness of the sealing surface of a large-caliber gate valve seat. The present invention includes a nut, a support sleeve, a spring, a support, an angle adjustment rod, a clamp, and a handle. The clamp and one end of the angle adjustment rod are connected by welding, and the other end of the angle adjustment rod is a screw rod, which is inserted into the hole on the support. The spring is placed in the groove on the back of the support, and the support sleeve is placed in the groove on the back of the support and covers the spring. The nut is connected to the screw rod of the angle adjustment rod by threads, and the support sleeve and the spring are pressed at the same time. The handle is connected to the upper end face of the support by threads. The present invention utilizes a light gap detection method to realize that a single person can conveniently, quickly and accurately perform flatness detection on the sealing surface at different angles, find out the deflection of the sealing surface, and formulate effective defect elimination measures.

Description

Technical Field

[0001] The invention belongs to the technical field of flatness detection, and in particular relates to a tool for detecting the flatness of a sealing surface of a large-caliber gate valve seat. Background Art

[0002] The gate valve is a shut-off valve that achieves sealing by the valve plate and the valve seat sealing surface to cut off the flow of the medium. It is generally suitable for large-diameter pipelines and is widely used in process systems such as chemical, petroleum, and power stations. Its sealing performance is related to the cut-off effect of the medium. Since the gate valve caliber is generally large and the equipment price is high, if there is a defect on the valve seat sealing surface, it is generally eliminated by grinding and then continued to be used. After the valve sealing surface is ground, the flatness of the sealing surface is tested to detect the quality after grinding and ensure that the sealing surface will not be worn off. If the flatness does not meet the requirements, the valve will not be effectively sealed after closing. In order to ensure the flatness of the sealing surface after grinding, it is necessary to use measuring tools such as knife edge rulers and the light gap method to detect the flatness of the sealing surface. The flatness of the sealing surface can be judged by the size or color of the light transmittance, and effective grinding measures can be formulated according to the unevenness of the plane to quickly eliminate defects. For gate valves with a diameter of about DN300-1200, the current flatness detection of the valve seat sealing surface after grinding has the following problems:

[0003] 1. For large-caliber wedge-type double-disc valves, the contact condition between the gate and the valve seat sealing surface can be tested by blue oil or red lead powder test, but the valve needs to be assembled after grinding, and the valve needs to be opened and closed by hand, and then the valve needs to be disassembled to check the test condition. The assembly and disassembly of large-caliber gate valves involves hoisting, manual switching, etc., which is labor-intensive and time-consuming;

[0004] 2. For large-diameter parallel gate valves, there is currently no effective blue oil test method. The sealing test can be carried out by pressurizing the valve cavity, but it also involves the assembly, disassembly and manual switch of the valve, the replacement of sealing spare parts, the clamping of the double gates, etc. If the seal is unqualified, the disassembly and assembly process needs to be repeated;

[0005] 3. For general small and medium-sized gate valves, the flatness detection can be carried out by light gap valve, but the valve cavity of large-diameter gate valve is deep, and personnel cannot enter inside, and hands cannot reach the lower sealing surface, so the flatness of the valve seat sealing surface cannot be detected by light gap method;

[0006] 4. When inspecting the flatness of the upper sealing surface of the valve seat, personnel need to lie on the upper part of the valve cavity, which poses an industrial safety risk. In addition, one person needs to shine a light from below and another person needs to use a knife-edge ruler to inspect, and the accuracy of the inspection result is not high.

[0007] In view of the above problems, if the sealing surface flatness cannot be measured in time after grinding, the sealing test will be carried out after the valve is assembled, which will increase the workload of valve disassembly and reassembly, especially for large-diameter gate valves. The valve disassembly and assembly involves manual switching (long time), hoisting and valve plate clamping (parallel double gate valve) and other issues, which greatly increases the workload. Therefore, it is urgent to develop a special tool for fast and convenient large-diameter gate valve seat sealing surface flatness detection, and use the light gap method to detect the flatness of the valve seat sealing surface. Summary of the invention

[0008] The purpose of the present invention is to address the deficiencies in the prior art by providing a large-diameter gate valve seat sealing surface flatness detection tool, which utilizes a light gap detection method to enable a single operator to conveniently, quickly and accurately perform flatness detection on the sealing surface at different angles, identify the deflection of the sealing surface, and formulate effective defect elimination measures.

[0009] The technical solution adopted by the present invention is:

[0010] A tool for detecting the flatness of a sealing surface of a large-diameter gate valve seat comprises a nut, a support sleeve, a spring, a support, an angle adjustment rod, a clamp, and a handle. The clamp and one end of the angle adjustment rod are connected by welding, and the other end of the angle adjustment rod is a screw rod which penetrates into a hole on the support. The spring is placed in a groove on the back side of the support, and the support sleeve is placed in the groove on the back side of the support and covers the spring. The nut is connected to the screw rod of the angle adjustment rod by threads and simultaneously presses the support sleeve and the spring. The handle is connected to the upper end face of the support by threads.

[0011] The angle adjustment rod is provided with a plum blossom boss, and different adjustment angle values ​​can be set according to needs. The support is provided with a plum blossom groove. The plum blossom boss of the angle adjustment rod cooperates with the plum blossom groove on the support to accurately adjust the rotation angle.

[0012] The handle is a hollow structure, a battery holder is arranged in the handle, and the LED cable is connected to the battery in the handle.

[0013] An LED light switch is arranged on the handle, and the LED light switch is connected with an LED cable.

[0014] The handle surface is knurled for easy gripping.

[0015] The clamp includes two bowl-shaped steel plates, a clamp spring, a rubber plate, an LED light strip, and a clamp pull ring. The two bowl-shaped steel plates are connected by a spring and a rotating shaft. The rubber plate is pasted inside the clamping position of the two bowl-shaped steel plates, the LED light strip is pasted on the lower steel plate, and a pull ring is arranged on the upper steel plate.

[0016] The LED light strip is attached to the bottom of the fixture and is powered by two batteries.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) The present invention provides a new large-caliber gate valve seat sealing surface flatness detection tool. The support rod handle of the tool is threadedly connected through a short section, which can penetrate into the valve cavity of different depths. At the same time, the connection angle between the connecting rod and the support rod can be adjusted to achieve 360° rotation. The rotation angle can be accurately adjusted by using spring force and plum blossom interface. Once the adjustment is completed, it is stable at a certain angle and will not rotate. It is stable and reliable to use and can detect the flatness of the valve seat sealing surface at different angles;

[0019] (2) The present invention provides a new tool for testing the flatness of the sealing surface of a large-diameter gate valve seat. The device uses the rotational reaction force of a spring to provide a clamping force. Different springs can be replaced to adapt to different clamping forces. The clamp structure clamps a measuring tool such as a knife edge ruler. The contact part with the clamped object is made of wear-resistant rubber material to increase friction, reduce damage to the clamped object, and prevent the object from falling. The LED light is placed on the lower end surface of the clamped object (such as a knife edge ruler). No matter how the detection angle is adjusted, the relative position with the knife edge ruler remains unchanged, which is convenient for using the light gap method to detect the flatness of the surface;

[0020] (3) The present invention provides a new large-caliber gate valve seat sealing surface flatness detection tool. The handle on the support rod of the device is provided with knurling to increase friction and facilitate the staff to grasp the handle. The handle is connected by a thread, which can be quickly disassembled and stored without occupying storage space.

[0021] (4) The present invention provides a new large-caliber gate valve seat sealing surface flatness detection tool, which uses an energy-saving LED light strip and can be powered by two batteries. The light strip is attached to the bottom of the fixture, which is convenient for maintenance and use. The LED light cable is arranged as a hidden line in the handle (hollow), and the switch is located at the bottom of the handle, which is convenient for switching.

[0022] (5) The present invention provides a new large-diameter gate valve seat sealing surface flatness detection tool. By using the tool, the flatness of the valve seat sealing surface can be detected conveniently, quickly and accurately before the valve is reinstalled, effective grinding measures can be formulated, and the grinding quality can be evaluated to ensure that the grinding is qualified once, thereby reducing the number of valve disassembly and assembly times and the frequent start and stop of the system;

[0023] (6) The present invention provides a new large-diameter gate valve seat sealing surface flatness detection tool. Through the use of this tool, the detection manpower and detection time can be effectively reduced, and the maintenance efficiency and maintenance quality can be improved. This method effectively solves the problem that the flatness of the large-diameter gate valve seat sealing surface cannot be detected, and provides a reference for the flatness detection of surfaces that other personnel cannot reach or measure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of a large-caliber gate valve seat sealing surface flatness detection tool provided by the present invention;

[0025] Figure 2 A detailed schematic diagram of a fixture on a tool for detecting the flatness of a large-caliber gate valve seat sealing surface provided by the present invention.

[0026] In the figure: 1-nut, 2-support sleeve, 3-spring, 4-support, 5-angle adjustment rod, 6-clamp, 7-handle, 8-LED light switch, 9-clamp spring, 10-rubber plate, 11-LED light strip, 12-clamp pull ring. DETAILED DESCRIPTION

[0027] The following is a further detailed description of a tool for detecting the flatness of a sealing surface of a large-caliber gate valve seat provided by the present invention in conjunction with the accompanying drawings and specific embodiments.

[0028] like Figure 1 As shown, the present invention provides a large-caliber gate valve seat sealing surface flatness detection tool, including a nut 1, a support sleeve 2, a spring 3, a support 4, an angle adjustment rod 5, a clamp 6, a handle 7, an LED light switch 8, a clamp spring 9, a rubber sheet 10, an LED light strip 11, a clamp pull ring 12,

[0029] The clamp 6 is connected to one end of the angle adjustment rod 5 by welding, and the other end of the angle adjustment rod 5 is a screw rod, which penetrates into the hole on the support 4. The angle adjustment rod 5 is provided with a plum blossom boss, and different adjustment angle values ​​can be set according to needs. The support 4 is provided with a plum blossom groove, and the plum blossom boss of the angle adjustment rod cooperates with the plum blossom groove on the support to accurately adjust the rotation angle;

[0030] The spring 3 is placed in the groove on the back of the support 4.

[0031] The support sleeve 2 is placed in the groove on the back of the support 4 and covers the spring 3.

[0032] The nut 1 is connected to the screw of the angle adjustment rod 5 by threads, and at the same time, the support sleeve 2 and the spring 3 are pressed tightly.

[0033] The handle 7 is connected to the upper end surface of the support 4 by a thread. The handle 7 is a hollow structure. A battery holder is provided in the handle 7. The LED cable is connected to the battery in the handle 7. An LED light switch 8 is provided on the handle 7. The surface of the handle 7 is knurled for easy gripping.

[0034] like Figure 2As shown, the clamp 6 includes two bowl-shaped steel plates, a clamp spring 9, a rubber sheet 10, an LED light strip 11, and a clamp pull ring 12. The two bowl-shaped steel plates are connected by a spring and a rotating shaft. The rubber sheet 10 is pasted inside the clamping part of the two bowl-shaped steel plates, the LED light strip 11 is pasted on the lower steel plate, and a pull ring 12 is set on the upper steel plate.

[0035] The LED light strip 11 is attached to the bottom of the fixture 6 and is powered by two AAA batteries;

[0036] The clamp 6 and the inner mutually clamping parts are provided with rubber plates, and the clamping torque is controlled by a spring.

[0037] Turn on the LED light switch 8, pull open the pull ring 12, put the measuring tool (knife edge ruler) on the rubber plate 10 in the clamp 6, loosen the pull ring 12, clamp the measuring tool, insert the measuring tool into the valve cavity, close the cover tightly, and detect the flatness of the sealing surface by the light gap method. If you want to adjust the detection angle, pull open the clamp 5, so that the plum blossom boss on the angle adjustment rod 5 is separated from the plum blossom groove on the support 4, rotate it to the required angle and then release it, so that the plum blossom boss is re-embedded in the plum blossom groove.

[0038] The implementation steps of the large-caliber gate valve seat sealing surface flatness detection tool are as follows:

[0039] 1. Insert the fixture and the angle adjustment rod into the support, and insert the plum blossom boss of the angle adjustment rod into the plum blossom groove of the valve seat according to the angle requirements;

[0040] 2. Install the spring into the support and insert the adjusting rod;

[0041] 3. Insert the support sleeve into the adjustment rod, press the spring, connect it with the adjustment rod using a nut, press the spring, and the reaction force of the spring will tighten the angle adjustment rod;

[0042] 4. Screw the handle into the upper end of the support seat, and connect the short sections of different lengths through threads according to the required depth;

[0043] 5. Turn on the battery switch on the handle and the LED light will turn on;

[0044] 6. Open the clamp through the pull ring, put the measuring tool (such as a knife edge ruler) into the clamp, release the pull ring, and clamp the measuring tool under the action of the spring force;

[0045] 7. Hold the knurling on the handle, put the flatness detection tool into the valve cavity, close the sealing surface, and detect the flatness of the sealing surface through light;

[0046] 8. If the outer circle of the sealing surface is brighter, the sealing surface is lower on the outside and higher on the inside; if the inner circle of the sealing surface is brighter, the sealing surface is higher on the outside and lower on the inside, you can adjust the diameter of the planetary wheel of the grinder or adjust the clamping force to grind and eliminate the defect.

[0047] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the art who, within the technical scope disclosed by the present invention, makes equivalent substitutions or changes based on the technical scheme and inventive concept of the present invention should be covered within the protection scope of the present invention.

Claims

1. A tool for detecting the flatness of the sealing surface of a large-caliber gate valve seat, characterized in that: It includes a nut, a support sleeve, a spring, a support, an angle adjustment rod, a clamp, and a handle. One end of the clamp and the angle adjustment rod are connected by welding. The other end of the angle adjustment rod is a screw rod, which is inserted into the hole on the support. The spring is placed in the groove on the back of the support. The support sleeve is placed in the groove on the back of the support and covers the spring. The nut is connected to the screw rod of the angle adjustment rod by threads, and the support sleeve and the spring are pressed at the same time. The handle is connected to the upper end surface of the support by threads. Insert the clamp and the angle adjustment rod into the support, and insert the plum blossom boss of the angle adjustment rod into the plum blossom groove of the support according to the angle requirement; install the spring in the support and insert the adjustment rod; insert the support sleeve into the adjustment rod, press the spring, connect it with the adjustment rod with a nut, compress the spring, and tighten the angle adjustment rod with the reaction force of the spring; screw the handle into the upper end face of the support seat, and connect short sections of different lengths through threads according to the required depth; turn on the battery switch on the handle, and the LED light will light up; open the clamp through the pull ring, put the measuring tool into the clamp, release the pull ring, and clamp the measuring tool under the action of the spring force; hold the knurling on the handle, put the flatness detection tool into the valve cavity, close the sealing surface, and detect the flatness of the sealing surface through light; if the light on the outer circle of the sealing surface is brighter, and the sealing surface is low on the outside and high on the inside, grind it by adjusting the diameter of the planetary gear of the grinder or adjusting the clamping force to eliminate the defect.

2. A large-caliber gate valve seat sealing surface flatness detection tool according to claim 1, characterized in that: The angle adjustment rod is provided with a plum blossom boss, and different adjustment angle values ​​can be set according to needs. The support is provided with a plum blossom groove, and the plum blossom boss of the angle adjustment rod cooperates with the plum blossom groove on the support to accurately adjust the rotation angle.

3. A large-caliber gate valve seat sealing surface flatness detection tool according to claim 1, characterized in that: The handle is a hollow structure, a battery holder is arranged in the handle, and the LED cable is connected to the battery in the handle.

4. A large-caliber gate valve seat sealing surface flatness detection tool according to claim 3, characterized in that: An LED light switch is arranged on the handle, and the LED light switch is connected with an LED cable.

5. A large-caliber gate valve seat sealing surface flatness detection tool according to claim 3, characterized in that: The handle surface is knurled for easy gripping.

6. A large-caliber gate valve seat sealing surface flatness detection tool according to claim 1, characterized in that: The clamp includes two bowl-shaped steel plates, a clamp spring, a rubber plate, an LED light strip, and a clamp pull ring. The two bowl-shaped steel plates are connected by a spring and a rotating shaft. The rubber plate is pasted inside the clamping position of the two bowl-shaped steel plates, the LED light strip is pasted on the lower steel plate, and a pull ring is arranged on the upper steel plate.

7. A large-caliber gate valve seat sealing surface flatness detection tool according to claim 6, characterized in that: The LED light strip is attached to the bottom of the fixture and is powered by two batteries.

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