A flow meter detection device based on volumetric method

Abstract

The present invention discloses a flow meter detection device based on a volumetric method in the field of meter detection technology, comprising an oil tank, wherein a measuring mechanism is arranged on the oil tank, and the measuring mechanism comprises an oil inlet pipe, a flow meter body, an inflow pipe, a measuring tank, an overflow mechanism, an external sleeve, a piston disc, an extension sleeve, a follower rod, a pressure block, a lateral sleeve, a transverse rod and a fixing mechanism, wherein one end of the oil inlet pipe is connected to the oil tank, and the other end of the oil inlet pipe is connected to the inflow pipe, and the inflow pipe is connected to the side walls of two measuring tanks, the flow meter body is mounted on the oil inlet pipe, the overflow mechanism is mounted on the oil tank, and the external sleeve is coaxially mounted on the measuring tank, the influence of gas pressure is avoided by the design of the air inlet hole, the combination of the follower rod and the pressure block provides convenient manual control, and the cooperation of the lateral sleeve and the transverse rod realizes a multi-level positioning function, and this multiple structural design significantly improves the measurement accuracy and repeatability of flow metering.

Description

Technical Field

[0001] The present invention relates to the technical field of meter detection, and more specifically, to a flow meter detection device based on a volumetric method. Background Art

[0002] In the current field of industrial metrology, flow meter detection devices based on the volumetric method are widely used in various fluid metering scenarios. However, this traditional detection method has technical limitations. Specifically, when the measuring medium flows into the measuring tank for volume measurement, due to the inherent errors of the measurement system and the influence of environmental factors, it is often impossible to achieve the ideal accuracy requirements, which directly affects the reliability of the measurement results.

[0003] More importantly, existing flow meter detection devices generally lack an accurate stop control mechanism. When the liquid in the measuring tank is about to reach the nominal capacity, the stop signal cannot be triggered in a timely and accurate manner, which often makes it difficult to instantly record the current flow value. This lack of control accuracy not only affects the accuracy of the measurement, but may also cause liquid waste and environmental pollution. At the same time, since the measurement end point cannot be accurately controlled, operators need to frequently intervene manually, which not only reduces work efficiency, but also increases the possibility of human errors, seriously affecting the scientificity and reliability of the entire detection process. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the problems existing in the prior art, the present invention provides a flow meter detection device based on the volumetric method to solve the technical problems mentioned in the background technology.

[0006] (II) Technical solution

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a flow meter detection device based on the volumetric method, comprising an oil tank, a measuring mechanism is arranged on the oil tank, the measuring mechanism comprises an oil inlet pipe, a flow meter body, an inflow pipe, a measuring tank, an overflow mechanism, an external sleeve, a piston disc, an extension sleeve, a follower rod, a pressure block, a lateral sleeve, a transverse rod and a fixing mechanism, one end of the oil inlet pipe is connected to the oil tank, the other end of the oil inlet pipe is connected to the inflow pipe, the inflow pipe is connected to the side walls of the two measuring tanks, the flow meter body is mounted on the oil inlet pipe, the overflow mechanism is mounted on the oil tank, the external sleeve is coaxially mounted on the measuring tank, the piston disc is slidably connected to the oil inlet pipe, and the oil inlet pipe is connected to the side walls of the two measuring tanks. On the inner wall of the measuring tank, a plurality of bottom holes are equidistantly opened at the lower end of the piston disk, the extension sleeve is installed on the piston disk, and the extension sleeve is slidably connected in the outer sleeve, a plurality of air inlet holes are equidistantly opened on the side wall of the extension sleeve, and the two ends of the plurality of air inlet holes are respectively connected to the measuring tank and the extension sleeve, one end of the follower rod is connected to the upper end surface of the extension sleeve, and the other end of the follower rod is connected to the pressure block, the follower rod is slidably connected to the upper end surface of the outer sleeve, the lateral sleeve is equidistantly installed on the side wall of the outer sleeve, a transverse rod is slidably connected in the lateral sleeve, a plurality of positioning holes are equidistantly opened on the outer sleeve, the transverse rod is inserted into the positioning hole, and the fixing mechanism is installed in the lateral sleeve.

[0008] Preferably, the fixing mechanism includes an internal rod, an elastic sheet and a transverse disk, one end of the internal rod is connected to the transverse rod, the other end of the internal rod is connected to the transverse disk, the internal rod is slidably connected in the lateral sleeve, a plurality of the elastic sheets are installed on the inner wall of the lateral sleeve, a snap-in groove is provided on the side wall of the internal rod, the elastic sheet is snapped in the snap-in groove, this structural design realizes precise positioning of the transverse rod through the cooperation between the internal rod and the elastic sheet, and the design of the elastic sheet snapping into the snap-in groove provides a reliable fixing force, thereby ensuring the stability of the position during the measurement process.

[0009] Preferably, a top sleeve is sleeved on the internal rod, and a plurality of lateral blocks are equidistantly provided on the upper end surface of the top sleeve. The plurality of lateral blocks are respectively slidably connected to the inner wall of the lateral sleeve, and an annular groove is provided on the outer wall of the top sleeve. The stability of the structure is enhanced by the sliding cooperation between the top sleeve and the lateral blocks. The design of the annular groove ensures the disengagement of the elastic sheet and the snap-in groove, and the uniform distribution of the plurality of lateral blocks ensures the sliding stability of the top sleeve.

[0010] Preferably, a spring is provided at the lower end of the lateral sleeve, a push-back sleeve is provided on the spring, the push-back sleeve is slidably connected in the lateral sleeve, and the internal rod is pressed on the push-back sleeve. This elastic support structure provides a pre-tightening force to ensure the reliability of the fixing mechanism. At the same time, the design of the push-back sleeve realizes the automatic resetting function when unlocking.

[0011] Preferably, a reflux pipe is connected to the oil tank, the other end of which is connected to the inlet pipe, and a reflux valve is provided on the reflux pipe. The design of the reflux system realizes the recycling of oil.

[0012] Preferably, the overflow mechanism includes a pressure relief pipe, an oil return pipe and a sealing head. The oil return pipe is connected to the side wall of the oil tank, and both ends of the pressure relief pipe are respectively connected to the oil inlet pipe and the oil return pipe. A fitting groove is opened in the pressure relief pipe, and the sealing head is abutted in the fitting groove. This sealing structure design ensures the reliability of the pressure relief process and realizes that the flow meter is in a stopped state after the measuring tank is filled.

[0013] Preferably, a fixed tube is coaxially provided on the pressure relief tube, a bellows is provided at the lower end of the fixed tube, a lifting rod is provided at the lower end of the bellows, a limiting ring is provided at the lower end of the fixed tube, the limiting ring is fixedly installed in the pressure relief tube, and the lifting rod is slidably connected in the limiting ring, a sealing spring is provided at the lower end of the lifting rod, the sealing spring is connected to the sealing head, a guide rod is provided on the sealing head, a guide sleeve is provided on the lifting rod, and the guide rod is slidably connected to the guide sleeve. This structure realizes the adjustment of the pressure relief pressure, the use of the bellows ensures the sealing, and the guide mechanism ensures the stability of the movement.

[0014] Preferably, a pressure rod is slidably provided in the fixed tube, and the lower end of the pressure rod abuts against the lifting rod. A lateral hole is provided on the side wall of the fixed tube, and a one-way rod is slidably provided in the lateral hole. An expansion frame is provided on the one-way rod, and a plurality of one-way grooves are equidistantly provided on the side wall of the pressure rod. The one-way rod is stuck in the one-way groove, and a tension spring is provided on the expansion frame. The tension spring is connected to the side wall of the fixed tube. This one-way locking mechanism realizes graded pressure adjustment.

[0015] Preferably, an unlocking rod is provided on both sides of the expansion frame, and a same-direction sleeve is symmetrically slidably provided at the upper and lower ends of the fixed tube. A contraction groove is provided on the same-direction sleeve, and the contraction groove abuts against the unlocking rod. This design realizes a simple unlocking operation through the same-direction movement, thereby improving the operating convenience of the device.

[0016] Preferably, the two unidirectional sleeves are respectively provided with a return spring, which is connected to the fixed tube. The provision of the return spring ensures automatic resetting of the structure after unlocking, thereby improving reliability and convenience of operation.

[0017] (III) Beneficial effects

[0018] Compared with the prior art, the present invention provides a flow meter detection device based on the volumetric method, which has the following beneficial effects:

[0019] The measuring mechanism realizes the precise input of oil by connecting the oil inlet pipe to the flowmeter body. The piston disc arranged in the measuring tank can move up and down with the change of oil level. The sliding cooperation between the extension sleeve and the outer sleeve realizes the precise control of the position of the piston disc. The influence of gas pressure is avoided by the design of the air inlet hole. The combination of the follower rod and the pressure block provides convenient manual control. The cooperation between the lateral sleeve and the transverse rod realizes the multi-level positioning function. This multiple structural design significantly improves the measurement accuracy and repeatability of flow metering.

[0020] The fixing mechanism adopts a combination design of internal rod and elastic sheet to realize convenient fixation of the transverse rod. The sliding cooperation between the transverse disk and the lateral block provides stable supporting force. The annular groove on the top sleeve cooperates with the spring to realize the automatic return function. The design of the push-back sleeve ensures the reliability of the unlocking process. The multiple locking mechanisms ensure the convenient adjustment of the piston disk position during the measurement process. This innovative fixed structure design improves the convenience of the measurement process.

[0021] The overflow mechanism realizes the pressure relief function through the cooperation of the pressure relief pipe and the oil return pipe. The precise cooperation between the sealing head and the fitting groove ensures the controllability of the pressure relief process. The bellows ensures the sealing performance during use. The cooperation between the guide rod and the guide sleeve ensures the stability of movement. The locking mechanism of the pressure rod and the one-way rod realizes the precise control of pressure. The combination of the same-direction sleeve and the return spring ensures the reliable reset of the structure. This overflow control process ensures that the oil in the flowmeter will stop flowing after the measuring tank is filled. Therefore, the degree can be measured conveniently and accurately, ensuring the accuracy of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of a flow meter detection device based on the volumetric method in the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of the pressure relief pipe and the fixed pipe in the present invention;

[0024] Figure 3 For the present invention Figure 2 A schematic cross-sectional structure diagram of ;

[0025] Figure 4 It is a structural schematic diagram of the fixed pipe in the present invention;

[0026] Figure 5 For the present invention Figure 4 A schematic cross-sectional structure diagram of ;

[0027] Figure 6 It is a schematic diagram of the expansion frame structure in the present invention;

[0028] Figure 7 It is a schematic diagram of the structure of the fixed pipe and the co-directional sleeve in the present invention;

[0029] Figure 8 It is a schematic cross-sectional structural diagram of the measuring tank and the piston disc in the present invention;

[0030] Fig. 9 It is a cross-sectional structural schematic diagram of the lateral sleeve and the pushback sleeve in the present invention;

[0031] Fig.10 It is a schematic cross-sectional structural diagram of the lateral sleeve in the present invention;

[0032] Fig.11 It is a schematic diagram of the structure of the internal rod in the present invention.

[0033] In the figure: 1, oil tank; 2, oil inlet pipe; 3, flow meter body; 4, inflow pipe; 5, measuring tank; 6, outer sleeve; 7, piston plate; 8, extension sleeve; 9, follower rod; 10, pressure block; 11, lateral sleeve; 12, transverse rod; 13, bottom hole; 14, air inlet hole; 15, positioning hole; 16, inner rod; 17, elastic sheet; 18, transverse plate; 19, clamping groove; 20, top sleeve; 21, lateral block; 22, annular groove; 23, spring; 24, push back sleeve ; 25. Return pipe; 26. Return valve; 27. Pressure relief pipe; 28. Oil return pipe; 29. ​​Sealing head; 30. Fitting groove; 31. Fixed pipe; 32. Bellows; 33. Lifting rod; 34. Limiting ring; 35. Sealing spring; 36. Guide rod; 37. Guide sleeve; 38. Press rod; 39. Lateral hole; 40. One-way rod; 41. Expansion frame; 42. One-way groove; 43. Tension spring; 44. Untie rod; 45. Same-direction sleeve; 46. Contraction groove; 47. Return spring. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0035] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0036] In the present invention, unless otherwise specified, the directions used, such as "up" and "down", usually refer to the directions shown in the drawings, or to the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directions are not used to limit the present invention.

[0037] See also Figure 1 and Figures 8 to 11A flow meter detection device based on the volumetric method comprises an oil tank 1, on which a measuring mechanism is arranged, the measuring mechanism comprising an oil inlet pipe 2, a flow meter body 3, an inflow pipe 4, a measuring tank 5, an overflow mechanism, an outer sleeve 6, a piston disc 7, an extension sleeve 8, a follower rod 9, a pressure block 10, a lateral sleeve 11, a transverse rod 12 and a fixing mechanism, one end of the oil inlet pipe 2 is connected to the oil tank 1, the other end of the oil inlet pipe 2 is connected to the inflow pipe 4, the inflow pipe 4 is connected to the side walls of two measuring tanks 5, the flow meter body 3 is mounted on the oil inlet pipe 2, the overflow mechanism is mounted on the oil tank 1, the outer sleeve 6 is coaxially mounted on the measuring tank 5, the piston disc 7 is slidably connected to the inner wall of the measuring tank 5, and the lower end of the piston disc 7 A plurality of bottom holes 13 are equidistantly provided on the end of the lateral sleeve 11, the extending sleeve 8 is mounted on the piston disc 7, and the extending sleeve 8 is slidably connected in the outer sleeve 6, a plurality of air inlet holes 14 are equidistantly provided on the side wall of the extending sleeve 8, and the two ends of the plurality of air inlet holes 14 are respectively connected to the measuring tank 5 and the extending sleeve 8, one end of the follower rod 9 is connected to the upper end surface of the extending sleeve 8, and the other end of the follower rod 9 is connected to the pressure block 10, the follower rod 9 is slidably connected to the upper end surface of the outer sleeve 6, a plurality of lateral sleeves 11 are equidistantly installed on the side wall of the outer sleeve 6, a transverse rod 12 is slidably connected in the lateral sleeve 11, a plurality of positioning holes 15 are equidistantly provided on the outer sleeve 6, the transverse rod 12 is inserted into the positioning hole 15, and the fixing mechanism is installed in the lateral sleeve 11.

[0038] Working principle: before measuring different flow meters, first install the flow meter to be measured on the corresponding position of the oil inlet pipe 2, and close the return valve 26. At this time, the opening of the pressure relief pipe 27 requires a certain pressure. Therefore, when the oil tank 1 starts to pump oil, it will first flow into the two measuring tanks 5. When measuring, open one measuring tank 5 and close the other measuring tank 5. At this time, the pumped oil can only flow into one measuring tank 5, and the flow meter body 3 begins to change the reading at this time. As the oil is pumped into the measuring tank 5, since there are multiple bottom holes 13 on the lower end surface of the piston disc 7, the oil will flow between the lower end of the piston disc 7 and the measuring tank 5. As more and more oil is added, the piston disc 7 moves upward, and the air at the upper end flows into the extension sleeve 8 through the air inlet hole 14, and then is discharged to the outside along the extension sleeve 8. At this time, the extension sleeve 8 moves upward with the piston disc 7. First, install the transverse rod 12 in the lateral sleeve 11 at the lower end. When the extension sleeve 8 is on top When the piston disc 7 is on the transverse rod 12, it cannot move upward and is therefore in a fixed state. As the oil pumping pressure continues to increase, it will then be greater than the pressure relief pressure of the pressure relief pipe 27, and the oil will flow back into the oil tank 1 through the return oil pipe 28. At this time, the oil in the inflow pipe 4 stops flowing, so the reading of the flow meter body 3 is fixed and recorded as a1. Then the oil pumping is stopped and the transverse rod 12 is inserted into the uppermost lateral sleeve 11. At this time, the oil pumping continues and the piston disc 7 continues to move upward until the extension sleeve 8 presses against the transverse rod 12, and then stops moving. At this time, the reading of the flow meter body 3 is recorded as a2. Since the capacities corresponding to the lowermost transverse rod 12 and the uppermost transverse rod 12 of the measuring tank 5 are known, a2 minus a1 is compared with this capacity. Therefore, the accuracy of the flow meter body 3 can be compared and the accuracy of the flow meter body 3 can be measured. Then, the measurement is repeated with another measuring tank 5 to avoid large errors, thereby completing the measurement process.

[0039] When the measuring process is completed and the oil needs to be returned to the oil tank 1, the return valve 26 is first opened, and then the corresponding pressure block 10 is pushed to move the piston plate 7 downward, and then the oil will flow into the oil tank 1 through the return pipe 25, thereby completing the use process.

[0040] In order to realize the change of the volume of the measuring tank 5, a fixing mechanism is added, see Figures 8 to 11The fixing mechanism includes an internal rod 16, an elastic sheet 17 and a transverse plate 18. One end of the internal rod 16 is connected to the transverse rod 12, and the other end of the internal rod 16 is connected to the transverse plate 18. The internal rod 16 is slidably connected in the lateral sleeve 11. A plurality of elastic sheets 17 are installed on the inner wall of the lateral sleeve 11. A clamping groove 19 is opened on the side wall of the internal rod 16. The elastic sheet 17 is clamped in the clamping groove 19. A top sleeve 20 is sleeved on the internal rod 16. The upper end surface of the top sleeve 20 is equidistantly A plurality of lateral blocks 21 are provided, and the plurality of lateral blocks 21 are respectively slidably connected to the inner wall of the lateral sleeve 11. An annular groove 22 is provided on the outer wall of the top sleeve 20. A spring 23 is provided at the lower end of the lateral sleeve 11, and a push-back sleeve 24 is provided on the spring 23. The push-back sleeve 24 is slidably connected in the lateral sleeve 11, and the internal rod 16 is pressed on the push-back sleeve 24. A return pipe 25 is connected to the oil tank 1, and the other end of the return pipe 25 is connected to the inlet pipe 4. A return valve 26 is provided on the return pipe 25.

[0041] Working principle: When the fixed position of the transverse rod 12 needs to be changed, the transverse rod 12 is first inserted into the lateral sleeve 11, and the internal rod 16 is inserted into the lateral sleeve 11 synchronously, and then the internal rod 16 will contact the push-back sleeve 24, so that the spring 23 is compressed, and the elastic sheet 17 is stuck on the multiple card slots 19, so that the internal rod 16 is in a unidirectional fixed state, and the transverse rod 12 is inserted into the positioning hole 15 to complete the fixing process. When it is necessary to unlock, continue to press the transverse plate 18, and the transverse plate 18 presses On the lateral block 21, the top sleeve 20 then slides downward and contacts the multiple elastic sheets 17, which then causes the elastic sheets 17 to get stuck in the annular grooves 22. At this time, the transverse disk 18 is released, and the push-back sleeve 24 moves upward under the action of the spring 23, and the push-back sleeve 24 presses on the top sleeve 20, driving the top sleeve 20 to slide upward, so that the elastic sheets 17 are released from the fit with the annular grooves 22. At this time, the transverse rod 12 and the internal rod 16 have been pulled out, and the top sleeve 20 returns to the uppermost end of the lateral sleeve 11, thus completing the release process.

[0042] See also Figures 1 to 7When the measuring tank 5 is filled and the flow meter body 3 needs to stop working, the overflow mechanism includes a pressure relief pipe 27, an oil return pipe 28 and a sealing head 29. The oil return pipe 28 is connected to the side wall of the oil tank 1. The two ends of the pressure relief pipe 27 are respectively connected to the oil inlet pipe 2 and the oil return pipe 28. A fitting groove 30 is provided in the pressure relief pipe 27. The sealing head 29 abuts against the fitting groove 30. A fixed pipe 31 is coaxially provided on the pressure relief pipe 27. A bellows 32 is provided at the lower end of the fixed pipe 31. A lifting rod 33 is provided at the lower end of the bellows 32. A limiting ring 34 is provided at the lower end of the fixed pipe 31. The limiting ring 34 is fixedly installed in the pressure relief pipe 27, and the lifting rod 33 is slidably connected in the limiting ring 34. A sealing spring 35 is provided at the lower end of the lifting rod 33. The sealing spring 35 is connected to the sealing head 29. A guide rod 36 is provided on the sealing head 29. There is a guide sleeve 37, and a guide rod 36 is slidably connected to the guide sleeve 37. A pressure rod 38 is slidably provided in the fixed tube 31, and the lower end of the pressure rod 38 abuts on the lifting rod 33. A lateral hole 39 is provided on the side wall of the fixed tube 31, and a one-way rod 40 is slidably provided in the lateral hole 39. An expansion frame 41 is provided on the one-way rod 40, and a plurality of one-way grooves 42 are equidistantly provided on the side wall of the pressure rod 38. The one-way rod 40 is stuck in the one-way groove 42. A tension spring 43 is provided on the expansion frame 41, and the tension spring 43 is connected to the side wall of the fixed tube 31. Unlocking rods 44 are respectively provided on both sides of the expansion frame 41. Same-direction sleeves 45 are symmetrically slidably provided at the upper and lower ends of the fixed tube 31. A contraction groove 46 is provided on the same-direction sleeve 45, and the contraction groove 46 abuts on the unlocking rod 44. Return springs 47 are respectively provided on the two same-direction sleeves 45, and the return spring 47 is connected to the fixed tube 31.

[0043] Working principle: When the pressure in the tube is greater than the elastic force of the sealing spring 35, the sealing head 29 will release the seal between the sealing head 29 and the fitting groove 30, and then the guide rod 36 on the sealing head 29 will slide along the guide sleeve 37, so that the oil can complete the reflux process through the pressure relief tube 27. When the pressure of the pressure relief needs to be increased, the operator presses on the pressure rod 38, which will drive the lifting rod 33 downward, and the bellows 32 will expand and contract accordingly, and ensure the sealing effect between the bellows 32 and the fixed tube 31. Due to the one-way clamping between the one-way rod 40 and the one-way groove 42, the connection between the two can be released when the pressure rod 38 slides downward, but it cannot move in the reverse direction. As the lifting rod 33 moves downward, the sealing spring 35 is compressed, thereby changing the sealing force, thereby changing the pressure of the pressure relief.

[0044] When the pressure of the pressure relief needs to be reduced, the operator pinches the two unidirectional sleeves 45 to make the two unidirectional sleeves 45 slide in the same direction. At this time, the contraction groove 46 contacts the release rod 44, thereby driving the expansion frame 41 to expand outward, thereby driving the tension spring 43 to be stretched. As the expansion frame 41 expands outward, the one-way rod 40 also releases the connection with the one-way groove 42. At this time, the operator can adjust the position of the pressure rod 38 upward, and change the corresponding pressure relief pressure by clamping the one-way rod 40 on different one-way grooves 42, thereby completing the adjustment process.

[0045] In all the schemes mentioned above, the connection between two parts can be selected according to actual conditions by welding, bolt and nut matching connection, bolt or screw connection or other well-known connection methods, which will not be described one by one here. In the above, all fixed connections are preferably welded. Although the embodiments of the present invention have been shown and described, it can be understood by ordinary technicians in this field that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A flow meter detection device based on a volumetric method, comprising an oil tank (1), characterized in that: The oil tank (1) is provided with a measuring mechanism, which comprises an oil inlet pipe (2), a flow meter body (3), an inflow pipe (4), a measuring tank (5), an overflow mechanism, an external sleeve (6), a piston disc (7), an extension sleeve (8), a follower rod (9), a pressure block (10), a lateral sleeve (11), a transverse rod (12) and a fixing mechanism. One end of the oil inlet pipe (2) is connected to the oil tank (1), the other end of the oil inlet pipe (2) is connected to the inflow pipe (4), the inflow pipe (4) is connected to the side walls of the two measuring tanks (5), the flow meter body (3) is mounted on the oil inlet pipe (2), the overflow mechanism is mounted on the oil tank (1), the external sleeve (6) is coaxially mounted on the measuring tank (5), the piston disc (7) is slidably connected to the inner wall of the measuring tank (5), and the lower end of the piston disc (7) is provided with a plurality of bottom holes at equal distances. The outer sleeve (6) has a plurality of holes (13) formed therein, the extending sleeve (8) is mounted on the piston disc (7), and the extending sleeve (8) is slidably connected to the outer sleeve (6), a plurality of air inlet holes (14) are equidistantly formed on the side wall of the extending sleeve (8), and the two ends of the plurality of air inlet holes (14) are respectively connected to the measuring tank (5) and the extending sleeve (8), one end of the follower rod (9) is connected to the upper end surface of the extending sleeve (8), and the other end of the follower rod (9) is connected to the pressure block (10), the follower rod (9) is slidably connected to the upper end surface of the outer sleeve (6), a plurality of lateral sleeves (11) are equidistantly mounted on the side wall of the outer sleeve (6), a transverse rod (12) is slidably connected to the inner side of the lateral sleeve (11), a plurality of locating holes (15) are equidistantly formed on the outer sleeve (6), the transverse rod (12) is inserted into the locating holes (15), and the fixing mechanism is mounted in the lateral sleeve (11).

2. The flow meter detection device based on the volumetric method according to claim 1 is characterized in that: The fixing mechanism comprises an internal rod (16), an elastic sheet (17) and a transverse plate (18); one end of the internal rod (16) is connected to the transverse rod (12); the other end of the internal rod (16) is connected to the transverse plate (18); the internal rod (16) is slidably connected in the lateral sleeve (11); a plurality of elastic sheets (17) are mounted on the inner wall of the lateral sleeve (11); a clamping groove (19) is provided on the side wall of the internal rod (16); and the elastic sheet (17) is clamped in the clamping groove (19).

3. The flow meter detection device based on the volumetric method according to claim 2 is characterized in that: A top sleeve (20) is sleeved on the inner rod (16), a plurality of lateral blocks (21) are equidistantly arranged on the upper end surface of the top sleeve (20), the plurality of lateral blocks (21) are respectively slidably connected to the inner wall of the lateral sleeve (11), and an annular groove (22) is provided on the outer wall of the top sleeve (20).

4. The flow meter detection device based on the volumetric method according to claim 2 is characterized in that: A spring (23) is provided at the lower end of the lateral sleeve (11), a push-back sleeve (24) is provided on the spring (23), the push-back sleeve (24) is slidably connected in the lateral sleeve (11), and the internal rod (16) is pressed on the push-back sleeve (24).

5. The flow meter detection device based on the volumetric method according to claim 1 is characterized in that: The oil tank (1) is connected to a return pipe (25), the other end of the return pipe (25) is connected to the inlet pipe (4), and a return valve (26) is provided on the return pipe (25).

6. The flow meter detection device based on the volumetric method according to claim 1 is characterized in that: The overflow mechanism comprises a pressure relief pipe (27), an oil return pipe (28) and a sealing head (29); the oil return pipe (28) is connected to the side wall of the oil tank (1); two ends of the pressure relief pipe (27) are respectively connected to the oil inlet pipe (2) and the oil return pipe (28); a fitting groove (30) is provided in the pressure relief pipe (27), and the sealing head (29) abuts against the fitting groove (30).

7. The flow meter detection device based on the volumetric method according to claim 6 is characterized in that: A fixed tube (31) is coaxially arranged on the pressure relief tube (27), a bellows (32) is arranged at the lower end of the fixed tube (31), a lifting rod (33) is arranged at the lower end of the bellows (32), a limiting ring (34) is arranged at the lower end of the fixed tube (31), the limiting ring (34) is fixedly installed in the pressure relief tube (27), and the lifting rod (33) is slidably connected in the limiting ring (34), a sealing spring (35) is arranged at the lower end of the lifting rod (33), the sealing spring (35) is connected to the sealing head (29), the sealing head (29) is provided with a guide rod (36), the lifting rod (33) is provided with a guide sleeve (37), and the guide rod (36) is slidably connected to the guide sleeve (37).

8. The flow meter detection device based on the volumetric method according to claim 7 is characterized in that: A pressure rod (38) is slidably provided in the fixed tube (31), and the lower end of the pressure rod (38) contacts the lifting rod (33). A lateral hole (39) is provided on the side wall of the fixed tube (31), and a one-way rod (40) is slidably provided in the lateral hole (39). An expansion frame (41) is provided on the one-way rod (40), and a plurality of one-way grooves (42) are equidistantly provided on the side wall of the pressure rod (38). The one-way rod (40) is stuck in the one-way grooves (42). A tension spring (43) is provided on the expansion frame (41), and the tension spring (43) is connected to the side wall of the fixed tube (31).

9. A flow meter detection device based on the volumetric method according to claim 8, characterized in that: The expansion frame (41) is provided with release rods (44) on both sides, and the upper and lower ends of the fixed tube (31) are symmetrically slidably provided with unidirectional sleeves (45), and the unidirectional sleeves (45) are provided with contraction grooves (46), which abut against the release rods (44).

10. A flow meter detection device based on the volumetric method according to claim 9, characterized in that: The two unidirectional sleeves (45) are respectively provided with a return spring (47), and the return spring (47) is connected to the fixed tube (31).

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