A detection device and detection method for pressure test buffer tank

Abstract

The present invention discloses a detection device and detection method for a pressure test buffer tank, including: a basic component, including a shell, the two ends of the shell are respectively connected to a measuring component one and a measuring component two; wherein the measuring component one includes: an assembly tube, one end of the assembly tube is connected to the shell, and the other end is provided with a movable opening; a hollow ball, the hollow ball is in the assembly tube, the other end of the hollow ball is connected to a pull rope, the pull rope extends from one end of the hollow ball into the shell and is connected to a winding measuring piece. After the present invention obtains part of the size data through the detection device, the maximum pressure that the pressure test buffer tank can withstand can be obtained according to the formula calculation, which is convenient for the staff to reasonably match the materials to make the pressure test buffer tank, so that the manufactured pressure test buffer tank meets the subsequent working pressure requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of buffer tank detection, and in particular to a detection device and a detection method for a pressure test buffer tank. Background Art

[0002] In the later stage of chemical construction, the process pipelines began to undergo water pressure or air pressure tests. Due to different process technology requirements, the test pressures given in the design are different. For high-pressure or ultra-high-pressure pipeline pressure tests, in order to ensure the safety of the process system, it is necessary to add a buffer tank between the pressure test pump and the process system to prevent system overpressure, improve system safety, and prevent pressure test workers from being injured.

[0003] At present, the production of pressure test buffer tanks is usually based on personal work experience to select materials and then produce them. This leads to the situation that the produced pressure test buffer tanks cannot withstand the subsequent working pressure, causing many safety accidents during subsequent use. In order to improve the safety of the system and prevent workers from being injured, we propose a detection device and detection method for pressure test buffer tanks, which can detect the pressure that the materials used to make the pressure test buffer tanks can withstand, so that the subsequently produced pressure test buffer tanks can meet work needs. Summary of the invention

[0004] The object of the present invention is to provide a detection device and a detection method for a pressure test buffer tank to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A detection device for a pressure test buffer tank, comprising:

[0007] The basic component comprises a housing, and two ends of the housing are respectively connected to a measuring component 1 and a measuring component 2;

[0008] Wherein, the measuring component 1 comprises:

[0009] An assembly tube, one end of which is connected to the housing, and the other end of which is provided with a movable opening;

[0010] A hollow ball, the hollow ball is in the assembly tube, and one end of the hollow ball is located in the movable opening and flush with the outer wall of the assembly tube, the other end of the hollow ball is connected to a drawstring, the end of the drawstring away from the hollow ball extends into the shell and is connected to a winding measuring piece, the winding measuring piece is used to unwind the drawstring and detect the length of the unwinding drawstring;

[0011] The second measuring component comprises:

[0012] The measuring frame has one end hinged with the shell, one side of the measuring frame is detachably provided with a fixed block, and one side of the measuring frame is also slidably provided with a movable block corresponding to the fixed block.

[0013] A further improvement is that the hollow sphere is filled with weight particles.

[0014] A further improvement is that the inner wall of the assembly tube is provided with a guide wheel group for guiding the pull rope, which is used to move the hollow ball vertically downward when the pull rope is wound and unwound on the measuring piece.

[0015] A further improvement is that the winding measuring member comprises:

[0016] A winding device is arranged in the shell, and the output end of the winding device is away from one end of the hollow ball. The output end of the winding device extends to the outside of the shell and is fixedly sleeved with a pointer. One end of the pointer is located at the axis of the scale ring, and the other end corresponds to the scale value on the scale ring. The scale ring is arranged on the shell.

[0017] A further improvement is that the winding measuring member further comprises:

[0018] A contact portion, one side of which is provided with a beveled edge for cooperating with the pointer; and,

[0019] A spring, one end of which is connected to the contact portion, and the other end of which is connected to an input end of a counter, wherein the counter is arranged on the housing;

[0020] When the pointer rotates one circle, the contact portion is pushed by the pointer to drive the spring to press the counter, so that the counter can count.

[0021] A further improvement is that one end of the hollow ball connected to the pull rope is in contact with a limiting block, the limiting block is fixed to the inner wall of the assembly tube, and a through hole is provided on the limiting block for the pull rope to pass through. When one end of the hollow ball is in contact with the limiting block, the other end thereof is flush with the outer wall of the assembly tube.

[0022] A further improvement is that a groove is provided at the end of the hollow ball away from the pull rope, and a touch-off button for controlling the winding device is provided at the bottom of the groove, and an arc-shaped pressure block is provided on one side of the touch-off button. The arc-shaped pressure block is connected to the bottom of the groove through an elastic member, and when the arc-shaped pressure block contacts the touch-off button, the outer end surface of the arc-shaped pressure block and the outer wall of the hollow ball are on the same circumferential surface.

[0023] A further improvement is that a positioning piece is symmetrically provided at one end of the assembly tube away from the movable opening, and the positioning piece includes:

[0024] A threaded column is disposed on the outer wall of the assembly tube through a bearing; and

[0025] The threaded sleeve is threadedly sleeved on the outer wall of the threaded column. The outer wall of the threaded sleeve is provided with a scale rod parallel to its axis. The scale rod movably penetrates the outer wall of the assembly tube and extends into the assembly tube.

[0026] A further improvement is that the measuring frame is provided with a scale plate horizontal to its length direction, a screw is rotatably provided in the inner cavity of the measuring frame, a driving rod is inserted into one end of the measuring frame, the driving rod is connected to one end of the screw through a bevel gear set, one end of the movable block is threadedly sleeved on the screw, and the other end passes through a through opening opened in the side wall of the measuring frame and corresponds to the fixed block.

[0027] A method for detecting a pressure test buffer tank, using the above-mentioned detection device, comprises the following steps:

[0028] S1: Test multiple materials to be tested in the pressure test buffer tank. During the test, the outer diameter and inner diameter of the outer ring of the material to be tested can be measured by the second measuring component. The inner radius of the material to be tested can be obtained according to the inner diameter. When testing some materials to be tested, the assembly tube is extended from the axis of one end into the inner cavity, and then the unwinding rope of the winding measuring piece is opened. At this time, the hollow ball moves downward under the action of gravity and contacts the bottom inner wall of the inner cavity of the area to be tested. The length of the unwinding rope measured by the winding measuring piece is added to the outer ring radius of the assembly tube to obtain the inner radius of the material to be tested, and then the outer diameter of the outer ring of the material to be tested is measured by the second measuring component.

[0029] S2: Obtain the wall thickness of the material to be tested according to the outer diameter of the outer ring of the material to be tested and the inner radius of the material to be tested;

[0030] S3: According to the formula: Calculate the pressure value of the material to be tested;

[0031] Where P is the pressure; R is the internal radius of the material to be tested; t is the minimum required thickness of the pressure test buffer tank material, which is calculated by subtracting 12.5% ​​of the negative tolerance of the pipe from the wall thickness of the pressure test buffer tank pipe; S is the maximum allowable stress; E is the weld joint coefficient, which is 1 for weld joints;

[0032] S4: Take the minimum value of the multiple pressure values ​​of the materials to be tested obtained by formula S3 to obtain the maximum pressure that the pressure test buffer tank can withstand.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] The present invention measures the material used to make the pressure test buffer tank through a detection device, obtains its partial dimensional data, and then calculates the pressure that the pressure test buffer tank material is borne according to a formula, wherein the minimum value of the pressure borne by the pressure test buffer tank material is the maximum pressure that the manufactured pressure test buffer tank can withstand, which is convenient for the staff to reasonably match the materials to manufacture the pressure test buffer tank, so that the manufactured pressure test buffer tank meets the subsequent working pressure requirements, prevents safety accidents, improves the safety of the system, and prevents the staff from being injured. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the structure of the present invention;

[0036] Figure 2 For the present invention Figure 1 A magnified schematic diagram of the structure A;

[0037] Figure 3 It is a schematic diagram of the structure of the winding measuring piece in the present invention;

[0038] Figure 4 This is a schematic diagram of the structure of the existing pressure test buffer tank.

[0039] In the figure: 100, basic component; 101, housing; 200, measuring component 1; 201, assembly tube; 202, movable port; 203, hollow ball; 204, weighted particles; 205, pull rope; 206, limit block; 207, winding device; 208, scale ring; 209, pointer; 210, counter; 211, spring; 212, contact part; 213, scale rod; 214, arc-shaped pressure block; 215, touch-off button; 216, threaded column; 217 , threaded sleeve; 300, measuring component 2; 301, measuring frame; 302, screw; 303, fixed block; 304, movable block; 305, scale plate; 306, driving rod; 400, pressure test buffer tank body; 401, seamless steel pipe; 402, water inlet; 403, butt-weld check valve; 404, water outlet; 405, buffer tank bracket; 406, discharge port; 407, safety valve port; 408, pressure gauge port; 409, spare buckle; 410, butt-weld gate valve. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] Example 1

[0042] Please see attached Figure 1 -Attached Figure 3

[0043] A detection device for a pressure test buffer tank, the pressure test buffer tank belongs to the prior art, for example, Figure 4 It can be seen that the material of the pressure test buffer tank generally includes a seamless steel pipe 401 with ends at both ends and a water inlet 402 and a water outlet 404 at the axis of both ends, a butt-welded check valve 403 connected to the water inlet 402, a buffer tank bracket 405 arranged at the bottom of the seamless steel pipe 401, a discharge port 406 arranged on the outer wall of the seamless steel pipe 401, a safety valve port 407, a pressure gauge port 408 and a spare port 409, etc.;

[0044] The detection device of the present application comprises:

[0045] The basic component 100 includes a housing 101, and two ends of the housing 101 are respectively connected to a measuring component 1 200 and a measuring component 2 300;

[0046] The measuring component 1 200 in the present application is mainly used to measure the inner radius of the transverse material to be tested in the pressure test buffer tank, such as the seamless steel pipe 401, and the measuring component 2 300 can be used to measure the outer diameter of the material to be tested in the pressure test buffer tank, and can also detect the inner radius of the vertical material to be tested in the pressure test buffer tank, such as the discharge port 406 and the safety valve port 407;

[0047] Wherein, the measuring component 200 includes:

[0048] An assembly tube 201, one end of which is connected to the housing 101, and the other end of which is provided with a movable opening 202;

[0049] The hollow ball 203 is located in the assembly tube 201, and one end of the hollow ball 203 is located in the movable opening 202 and is flush with the outer wall of the assembly tube 201. The other end of the hollow ball 203 is connected to a pull rope 205. The pull rope 205 extends from one end of the hollow ball 203 to the shell 101 and is connected to a winding measuring piece. The winding measuring piece is used to unwind the pull rope 205 and detect the length of the unwinding pull rope 205. The hollow ball 203 is filled with weight particles 204. The inner wall of the assembly tube 201 is provided with a guide wheel group for guiding the pull rope 205. The guide wheel group includes, for example, a pulley and a pulley shaft, which is used to move the hollow ball 203 vertically downward when the winding measuring piece unwinds the pull rope 205. For example, when measuring the inner radius of a seamless steel pipe 401, the assembly pipe 201 is inserted into the inner cavity of the seamless steel pipe 401 from the water inlet 402 or the water outlet 404 at the end of the seamless steel pipe 401, and the hollow ball 203 is facing downward. The pull rope 205 is unwound by winding the measuring piece. At this time, the hollow ball 203 pulls the pull rope 205 under the action of its gravity until it contacts the bottom inner wall of the seamless steel pipe 401. At this time, the unwinding length of the unwinding pull rope 205 plus the outer ring radius of the assembly pipe 201 is added to obtain the inner radius of the seamless steel pipe 401, and the inner diameter is obtained by multiplying the inner radius value by 2.

[0050] The measurement component 2 300 includes:

[0051] The measuring frame 301 is hinged at one end with the housing 101, so that it can be folded and stored when not in use. A fixed block 303 is detachably provided on one side of the measuring frame 301, for example, it is fixed by bolts. A movable block 304 corresponding to the fixed block 303 is also slidably provided on one side of the measuring frame 301. When measuring the outer diameter of the outer ring of the material to be detected, the fixed block 303 and the movable block 304 are respectively in contact with two opposite outer walls of the material to be detected. At this time, the distance between the fixed block 303 and the movable block 304 is the outer diameter of the outer ring of the material to be detected; when measuring the inner radius of the material to be detected, the fixed block 303 and the movable block 304 are respectively in contact with two opposite inner walls of the material to be detected. At this time, the distance between the fixed block 303 and the movable block 304 plus the width of the fixed block 303 and the movable block 304 is the inner diameter of the material to be detected, and the inner radius of the material to be detected can be obtained through the inner diameter;

[0052] The measuring frame 301 is provided with a scale plate 305 parallel to its length direction so as to know the distance between the fixed block 303 and the movable block 304; the measuring frame 301 inner cavity is provided with a screw 302 for rotation, and the screw 302 is parallel to the length direction of the measuring frame 301, and a driving rod 306 is inserted at one end of the measuring frame 301, and the driving rod 306 is T-shaped, and a bearing is provided at the connection with the measuring frame 301 so that the user can rotate it manually, and the driving rod 306 is connected to one end of the screw 302 through a bevel gear set, and the bevel gear set is two sets of meshing bevel gears, and one end of the movable block 304 is threadedly sleeved on the screw 302, and the other end passes through the through hole opened in the side wall of the measuring frame 301 and corresponds to the fixed block 303, and by rotating the driving rod 306, the driving rod 306 causes the screw 302 to rotate through the bevel gear set, thereby changing the distance between the fixed block 303 and the movable block 304.

[0053] Preferably, the winding measuring device of this embodiment includes:

[0054] The winding device 207 is arranged in the outer shell 101. The output end of the winding device 207 is the end of the winding rope 205 away from the hollow ball 203. The output end of the winding device 207 extends to the outside of the outer shell 101 and is fixedly sleeved with a pointer 209. One end of the pointer 209 is located at the axis of the scale ring 208, and the other end corresponds to the scale value on the scale ring 208. The scale ring 208 is arranged on the outer shell 101.

[0055] The winding device 207 includes, for example, a servo motor, a reducer and a roller body. The servo motor and the reducer drive the roller body to rotate to perform the work of winding up or unwinding the pull rope 205. The scale ring 208 is a ring-shaped part with scale values. When the roller body unwinds the pull rope 205, the pointer 209 rotates synchronously. The unwinding length of the pull rope 205 is obtained by subtracting the value on the scale ring 208 corresponding to the pointer 209 after unwinding from the value on the scale ring 208 corresponding to the pointer 209 at the beginning. For example, the value on the scale ring 208 corresponding to the pointer 209 initially is 0, and the value on the scale ring 208 corresponding to the pointer 209 after unwinding is 20, then the length of the unwinding pull rope 205 is 20.

[0056] Preferably, the winding measuring device of this embodiment further includes:

[0057] The contact portion 212 has a beveled edge on one side thereof that matches the pointer 209. Figure 3 It can be seen that the end of the pointer 209 also has a beveled edge that matches the beveled edge on the contact portion 212; and,

[0058] A spring 211, one end of which is connected to the contact portion 212, and the other end of which is connected to the input end of the counter 210;

[0059] When the pointer 209 rotates one circle, the contact portion 212 is pushed by the pointer 209 to drive the spring 211 to squeeze the counter 210, so that the counter 210 counts. For example, when the counter 210 displays 3, it means that the pointer 209 has rotated 3 circles, and the value of the scale ring 208 is 20 per circle. At the same time, when the pointer 208 points to the value 5 after rotating 3 circles, the length of the unwinding rope 205 is: 3×20+5.

[0060] Preferably, one end of the hollow ball 203 of this embodiment that is connected to the pull rope 205 is fitted with a limit block 206. The limit block 206 is fixed to the inner wall of the assembly tube 201. The limit block 206 is provided with a through hole for the pull rope 205 to pass through. When one end of the hollow ball 203 is fitted with the limit block 206, the other end thereof is flush with the outer wall of the assembly tube 201 to ensure the accuracy of the measured value.

[0061] Preferably, a groove is provided at one end of the hollow ball 203 of this embodiment away from the pull rope 205, and a touch-off button 215 for controlling the winding device 207 is provided at the bottom of the groove, and an arc-shaped pressing block 214 is provided on one side of the touch-off button 215, and the arc-shaped pressing block 214 is connected to the bottom of the groove through an elastic member, and when the arc-shaped pressing block 214 contacts the touch-off button 215, the outer end face of the arc-shaped pressing block 214 and the outer wall of the hollow ball 203 are on the same circumferential surface. The hollow ball 203 first contacts the inner wall of the bottom of the inner cavity of the material to be tested through the arc-shaped pressing block 214 downward, and under the action of the gravity of the hollow ball 203, the arc-shaped pressing block 214 squeezes the elastic member and contacts the touch-off button 215, and at this time, the touch-off button 215 causes the winding device 207 to stop unwinding the pull rope 205.

[0062] Preferably, the end of the assembly tube 201 of this embodiment away from the movable opening 202 is symmetrically provided with positioning members, and the positioning members include:

[0063] The threaded column 216 is disposed on the outer wall of the assembly tube 201 through a bearing; and

[0064] A threaded sleeve 217 is threadedly sleeved on the outer wall of a threaded column 216. A graduated rod 213 parallel to the axis of the threaded sleeve 217 is disposed on the outer wall of the threaded column 216. The graduated rod 213 movably penetrates the outer wall of the assembly tube 201 and extends into the assembly tube 201. The threaded column 216 is rotated to move the threaded sleeve 217 close to the inner wall of the material to be tested. The graduated rod 213 is observed at the same time. When the values ​​of the upper and lower graduated rods 213 are the same, the assembly tube 201 is positioned at the axis of the material to be tested. For example, the assembly tube 201 is inserted from the water inlet 402 into the inner cavity of the seamless steel tube 401. The threaded sleeve 217 is rotated to make the outer end of the threaded sleeve 217 close to the inner wall of the water inlet 402. The assembly tube 201 is adjusted to be at the axis of the water inlet 402.

[0065] A method for detecting a pressure test buffer tank, using the above-mentioned detection device, comprises the following steps:

[0066] S1: Test multiple materials to be tested in the pressure test buffer tank. During the test, the outer diameter and inner diameter of the outer ring of the material to be tested can be measured by the second measuring component 300, and the inner radius of the material to be tested can be obtained according to the inner diameter; when testing some materials to be tested, the assembly tube 201 is extended from the axis of one end into the inner cavity, and then the unwinding rope 205 of the winding measuring piece is opened. At this time, the hollow ball 203 moves downward under the action of gravity and contacts the inner wall of the bottom of the inner cavity of the material to be tested. The length of the unwinding rope 205 measured by the winding measuring piece is added to the outer ring radius of the assembly tube 201 to obtain the inner radius of the material to be tested, and then the outer diameter of the outer ring of the material to be tested is measured by the second measuring component 300;

[0067] S2: Obtain the wall thickness of the material to be detected according to the outer diameter of the outer ring of the material to be detected and the inner radius of the material to be detected. For example, the inner diameter of the material to be detected is obtained by multiplying the inner radius of the material to be detected by 2, and then the wall thickness of the material to be detected is obtained by dividing the outer diameter of the outer ring of the material to be detected by the inner diameter of the material to be detected by ÷ 2;

[0068] S3: According to the formula: Calculate the pressure value of the material to be tested;

[0069] Where P is the pressure; R is the internal radius of the material to be tested; t is the minimum required thickness of the pressure test buffer tank material, which is calculated by subtracting 12.5% ​​of the negative tolerance of the pipe from the wall thickness of the pressure test buffer tank pipe; S is the maximum allowable stress; E is the weld joint coefficient, which is 1 for weld joints;

[0070] It should be noted that this formula is based on ASME SECTION VIII - DIVISION 1 and UG-27 Thickness of Shells Under Internal Pressure;

[0071] S4: Take the minimum value of the multiple pressure values ​​of the materials to be tested obtained by formula S3 to obtain the maximum pressure that the pressure test buffer tank can withstand.

[0072] The following examples illustrate:

[0073] The material used for the buffer tank is A106B, with a pipe diameter of 3 inches and a wall thickness of XXS, a diameter of 88.9 mm, and a wall thickness of 15.24 mm;

[0074] R: inner radius of the steel pipe 88.9 / 2-15.24=29.21mm;

[0075] t: The minimum required thickness of the pressure test buffer tank material is 15.24*(1-12.5%)=13.335≈13.34mm;

[0076] S: Maximum allowable stress operating temperature is 35°C. Check the ASME SEC II Part D Table 1A specification and calculate the allowable stress to be 17100 psi, 17100 / 14.5≈1180 bar.

[0077] E: welding joint coefficient (take 1 for welding joint);

[0078] According to the formula Calculate the pressure value, P=443.68bar;

[0079] According to the above method, the pressure that the buffer tank body, buffer tank branch pipe, buffer tank head and buffer tank pipe platform can withstand can be calculated. The pressure that other parts of the buffer tank structure, such as the buffer tank gate valve and buffer tank check valve can be directly calculated based on the sealing pressure.

[0080] Compare the pressures that the above materials can withstand, and the minimum value is the maximum pressure that the buffer tank can withstand.

[0081] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A detection device for a pressure test buffer tank, characterized in that: include: A basic component (100) comprises a housing (101), wherein two ends of the housing (101) are respectively connected to a measuring component 1 (200) and a measuring component 2 (300); Wherein, the measurement component 1 (200) comprises: An assembly tube (201), one end of the assembly tube (201) is connected to the housing (101), and the bottom of the other end is provided with a movable opening (202) opening downward; A hollow ball (203), the hollow ball (203) is in the assembly tube (201), the other end of the hollow ball (203) is connected to a drawstring (205), one end of the drawstring (205) away from the hollow ball (203) extends into the housing (101) and is connected to a winding measuring piece, the winding measuring piece is used to unwind the drawstring (205) and detect the length of the unwinding drawstring (205); The second measuring component (300) comprises: A measuring frame (301) is hinged at one end to the housing (101), a fixed block (303) is detachably provided on one side of the measuring frame (301), and a movable block (304) corresponding to the fixed block (303) is slidably provided on one side of the measuring frame (301); The hollow ball (203) is filled with weight particles (204), and one end of the hollow ball (203) is located in the movable opening (202) and is flush with the outer wall of the assembly tube (201); When testing a portion of the material to be tested, the assembly tube (201) is extended from the axis of one end thereof into its inner cavity, and then the unwinding rope (205) is unwound by opening the winding measuring piece. At this time, the hollow ball (203) moves downward under the action of gravity and contacts the bottom inner wall of the inner cavity of the area to be tested. The length of the unwinding rope (205) measured by the winding measuring piece is added to the outer circle radius of the assembly tube (201) to obtain the inner radius of the material to be tested.

2. The detection device according to claim 1, characterized in that: The inner wall of the assembly tube (201) is provided with a guide wheel group for guiding the draw rope (205), which is used to make the hollow ball (203) move vertically downward when the draw rope (205) is unwound by the measuring piece.

3. The detection device according to claim 1, characterized in that: The winding measuring member comprises: A winding device (207) is arranged in the housing (101); the output end of the winding device (207) is wound around one end of the pull rope (205) away from the hollow ball (203); the output end of the winding device (207) extends to the outside of the housing (101) and is fixedly sleeved with a pointer (209); one end of the pointer (209) is located at the axis of a scale ring (208), and the other end corresponds to a scale value on the scale ring (208); and the scale ring (208) is arranged on the housing (101).

4. The detection device according to claim 3, characterized in that: The winding measuring member also includes: a contact portion (212) having a beveled edge on one side thereof for cooperating with the pointer (209); and, A spring (211), one end of which is connected to the contact portion (212), and the other end of which is connected to an input end of a counter (210), wherein the counter (210) is disposed on the housing (101); When the pointer (209) rotates one circle, the contact portion (212) is pushed by the pointer (209) to drive the spring (211) to press the counter (210), so that the counter (210) can count.

5. The detection device according to claim 4, characterized in that: One end of the hollow ball (203) connected to the pull rope (205) fits in with a limit block (206); the limit block (206) is fixed to the inner wall of the assembly tube (201); a through hole is provided on the limit block (206) for the pull rope (205) to pass through; when one end of the hollow ball (203) fits in with the limit block (206), the other end thereof is flush with the outer wall of the assembly tube (201).

6. The detection device according to claim 5, characterized in that: A groove is provided at one end of the hollow ball (203) away from the pull rope (205); a touch-off button (215) for controlling the winding device (207) is provided at the bottom of the groove; an arc-shaped pressing block (214) is provided on one side of the touch-off button (215); the arc-shaped pressing block (214) is connected to the bottom of the groove via an elastic member; when the arc-shaped pressing block (214) contacts the touch-off button (215), the outer end surface of the arc-shaped pressing block (214) and the outer wall of the hollow ball (203) are on the same circumferential surface.

7. The detection device according to claim 1, characterized in that: A positioning member is symmetrically provided at one end of the assembly tube (201) away from the movable opening (202), and the positioning member comprises: A threaded column (216) is disposed on the outer wall of the assembly tube (201) via a bearing; and A threaded sleeve (217) is threadedly sleeved on the outer wall of the threaded column (216); the outer wall of the threaded sleeve (217) is provided with a scale rod (213) parallel to its axis; the scale rod (213) movably penetrates the outer wall of the assembly tube (201) and extends into the assembly tube (201).

8. The detection device according to claim 1, characterized in that: The measuring frame (301) is provided with a scale plate (305) which is horizontal to the length direction thereof; a lead screw (302) is rotatably provided in the inner cavity of the measuring frame (301); a driving rod (306) is inserted into one end of the measuring frame (301); the driving rod (306) is connected to one end of the lead screw (302) through a bevel gear set; one end of the movable block (304) is threadedly sleeved on the lead screw (302); the other end of the movable block (304) passes through a through opening provided in a side wall of the measuring frame (301) and corresponds to the fixed block (303).

9. A method for detecting a pressure test buffer tank, using the detection device according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: Testing multiple materials to be tested in the pressure test buffer tank. During the testing, the outer diameter and the inner diameter of the outer ring of the material to be tested are measured by the second measuring component (300), and the inner radius of the material to be tested is obtained according to the inner diameter; when testing some of the materials to be tested, the assembly tube (201) is extended from the axis of one end into the inner cavity thereof, and then the unwinding rope (205) of the winding measuring piece is opened. At this time, the hollow ball (203) moves downward under the action of gravity and contacts the bottom inner wall of the inner cavity of the area to be tested. The length of the unwinding rope (205) measured by the winding measuring piece is added to the outer ring radius of the assembly tube (201) to obtain the inner radius of the material to be tested, and then the outer diameter of the outer ring of the material to be tested is measured by the second measuring component (300); S2: Obtain the wall thickness of the material to be tested according to the outer diameter of the outer ring of the material to be tested and the inner radius of the material to be tested; S3: According to the formula: Calculate the pressure value of the material to be tested; Where P is the pressure; R is the internal radius of the material to be tested, and t is the minimum required thickness of the pressure test buffer tank material, which is calculated by subtracting 12.5% ​​of the negative tolerance of the pipe from the wall thickness of the pressure test buffer tank pipe; S is the maximum allowable stress; E is the welding joint coefficient, which is 1 for the welding joint; S4: Take the minimum value of the multiple pressure values ​​of the materials to be tested obtained by formula S3 to obtain the maximum pressure that the pressure test buffer tank can withstand.

Images