Device for detecting leakage rate in hydraulic hoist cylinder

Abstract

The utility model discloses a hydraulic hoist in-cylinder leakage rate detection device, which particularly relates to the technical field of leakage rate detection, and comprises a hydraulic cylinder body, a flange plate is fixedly arranged at the output end of the hydraulic cylinder body, and a connecting cover is movably arranged at the upper end of the flange plate; the upper end of the hydraulic cylinder body is provided with a sealing connection device capable of connecting the connecting cover and the hydraulic cylinder body in a sealing mode, and the sealing connection device is used for connecting the hydraulic cylinder body and the connecting cover in a sealing mode and enabling leaked oil to flow into the connecting cover. The sealing connecting device comprises a threaded groove, the threaded groove is formed in the inner side of the periphery of the flange plate, and a bolt is movably arranged in the through groove of the connecting cover; a leakage metering device capable of measuring leaked oil is arranged at the upper end of the connecting cover and used for observing the volume of the leaked oil and calculating the leakage amount. By arranging the sealing connection device, the hydraulic cylinder body and the connection cover can be connected in a sealing mode, leaked oil flows into the connection cover, connection is more convenient, the trouble of repeated installation is reduced, and detection efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of leakage detection, and more specifically, to a leakage detection device in a cylinder of a hydraulic hoist. Background Art

[0002] The hydraulic gate hoist is generally composed of a hydraulic system and a hydraulic cylinder. Under the control of the hydraulic system, the inner wall of the piston in the hydraulic cylinder makes axial reciprocating motion, thereby driving the connecting rod and the gate connected to the piston to make linear motion to achieve the purpose of opening and closing the orifice; and the leakage in the hydraulic cylinder is one of the indicators of the factory acceptance of the hydraulic gate hoist. The leakage in the hydraulic cylinder mainly refers to the leakage of the pressure oil inside the hydraulic cylinder from the higher pressure oil chamber to the lower pressure oil chamber, so that the rod chamber of the hydraulic cylinder is connected to the rodless chamber, resulting in a decrease in the output pressure of the hydraulic cylinder. The internal leakage detection test method in the factory is: let the working chamber of the tested cylinder be filled with oil, pressurized to the rated pressure or the user-specified pressure, and measure the leakage from the piston to the unpressurized chamber. For this purpose, a cylinder leakage detection device is proposed to detect whether the hydraulic gate hoist is qualified.

[0003] After searching, for example, a Chinese patent application with application number CN202022659867.1 discloses a device for detecting internal leakage of a hydraulic cylinder of a hydraulic gate hoist. After the hydraulic cylinder of the hydraulic gate hoist is assembled in the factory, the oil pipe with a flange joint is connected to the oil port of the rodless chamber of the hydraulic cylinder, the oil port of the rod chamber of the hydraulic cylinder is connected to the high-pressure hose of the pump station, and the oil pipe with a straight-through joint is connected to the high-pressure hose of the pump station. The pump station is started, and oil is pumped into the rod chamber to make the piston rod run to the limit position. The pump is stopped, and the pump station is started to pump oil into the rodless chamber (the oil pumping pressure is less than the pressure to push the piston). After the space between the piston and the top of the oil pipe with a straight-through joint is filled with oil, the pump is stopped, and the high-pressure hose of the pump station is removed from the oil pipe with a straight-through joint. The pump station is started, and oil is pumped into the rod chamber according to the set pressure and time. The oil leaking from the rod chamber to the rodless chamber overflows from the top of the oil pipe with a straight-through joint and flows into the oil pan with a scale. The internal leakage value is read from the oil pan with a scale.

[0004] However, when the above technical solution is in use, the two ends of the two-way block need to be connected to the pump station and the pump station high-pressure hose multiple times, which is cumbersome to operate, and the leakage amount is observed by observing the oil in the scale oil pan. Since the liquid contacts the inner wall of the scale oil pan, there will be a certain error when observing the scale, resulting in inaccurate detection. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, an embodiment of the utility model provides a hydraulic hoist cylinder leakage detection device, the technical problem to be solved is: it is troublesome to install joints in multiple places, and the contact between the oil and the inner wall of the scale oil pan causes observation errors.

[0006] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a device for detecting leakage in a hydraulic hoist cylinder, comprising a hydraulic cylinder body:

[0007] A flange is fixedly provided at the output end of the hydraulic cylinder body, and a connecting cover is movably provided at the upper end of the flange;

[0008] The upper end of the hydraulic cylinder body is provided with a sealing connection device capable of sealingly connecting the connection cover with the hydraulic cylinder body, which is used to seal the hydraulic cylinder body and the connection cover so that the leaked oil flows into the interior of the connection cover;

[0009] The sealing connection device comprises a thread groove, the thread groove is arranged on the inner side of the outer periphery of the flange, and a bolt is movably arranged in the through groove of the connection cover;

[0010] The upper end of the connection cover is provided with a leakage metering device capable of measuring the leaked oil, which is used to observe the volume of the leaked oil and calculate the leakage amount.

[0011] In a preferred embodiment, a rubber sheet is movably provided on the upper end of the flange, a slot is provided on the inner side of the outer periphery of the rubber sheet, the slot is aligned with the thread groove, the bolt is inserted into the slot and the thread groove, and the bolt is threadedly connected to the thread groove.

[0012] In a preferred embodiment, a gasket is movably provided on the upper end of the connection cover, and the bolt is inserted into the inner side of the gasket.

[0013] In a preferred embodiment, the leakage metering device includes an oil collection box, which is fixedly arranged on the upper end of the connecting cover, the lower end of the oil collection box is connected to the upper end of the connecting cover, and a limit block is fixedly provided on the lower end of the inner wall of the oil collection box.

[0014] In a preferred embodiment, a rubber piston is movably provided inside the oil collection box, and a sliding rod is fixedly provided on the upper end of the rubber piston.

[0015] In a preferred embodiment, the upper end of the oil collection box passes through a limiting sleeve, the sliding rod passes through the inner side of the limiting sleeve, and the outer surface of the sliding rod is provided with scale lines.

[0016] In a preferred embodiment, an oil chamber is provided inside the hydraulic cylinder body, and a cylinder piston is movably provided inside the oil chamber.

[0017] Technical effects and advantages of the utility model:

[0018] 1. The utility model is provided with a sealing connection device, which is conducive to sealing the connection between the hydraulic cylinder body and the connection cover, so that the leaked oil flows into the inside of the connection cover, making the connection more convenient, reducing the trouble of repeated installation, and improving the detection efficiency. The rubber sheet is placed in the connection cover, and the bolts are inserted into the connection cover through grooves and rubber sheet slots, and are threadedly connected with the thread grooves in the flange plate, so as to realize the installation of the connection cover. By tightening the bolts, the connection cover squeezes the rubber sheet, so that the output end of the hydraulic cylinder body and the connection cover are sealed and connected, thereby improving the detection accuracy of the oil leakage amount;

[0019] 2. The utility model is provided with a leakage metering device, which is conducive to observing the volume of leaked oil and calculating the leakage amount, avoiding large errors in observation, making the error smaller and the detection more accurate. Through the fixedly connected connecting cover, when the hydraulic cylinder body is subjected to oil pressure by the pump station, the oil leaks from the cylinder piston position and is collected by the connecting cover and the oil collection box. The oil entering the oil collection box will push the rubber piston and the slide rod upward, so as to observe the scale line between the upper end of the limit sleeve and the surface of the slide rod, and then calculate the oil leakage in the cylinder, reducing the error in observation caused by the oil contacting the scale oil pan. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0021] Figure 2 It is a schematic diagram of the side section structure of the utility model.

[0022] Figure 3 It is an exploded view of the utility model.

[0023] Figure 4 This is a schematic structural diagram of the sealing connection device of the utility model.

[0024] Figure 5 It is a schematic diagram of the structure of the leakage metering device of the present utility model.

[0025] The accompanying drawings are marked as follows: 1. hydraulic cylinder body; 2. sealing connection device; 3. leakage metering device; 4. connecting cover; 5. flange; 6. oil chamber; 7. cylinder piston; 21. threaded groove; 22. rubber sheet; 23. slot; 24. bolt; 25. gasket; 31. oil collection box; 32. limit block; 33. rubber piston; 34. slide rod; 35. scale line; 36. limit sleeve. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in the field of leakage detection without creative work are within the scope of protection of the utility model.

[0027] like Figure 1 , 2 As shown in Figure 3, the utility model provides a device for detecting leakage in the cylinder of a hydraulic gate hoist, including a hydraulic cylinder body 1: a flange 5 is fixedly provided at the output end of the hydraulic cylinder body 1, a connecting cover 4 is movably provided at the upper end of the flange 5, an oil chamber 6 is opened on the inner side of the hydraulic cylinder body 1, and a cylinder piston 7 is movably provided inside the oil chamber 6.

[0028] In order to reduce the number of repeated installations of the oil joint, a sealing connection device 2 capable of sealingly connecting the connection cover 4 with the hydraulic cylinder body 1 is provided at the upper end of the hydraulic cylinder body 1, which is used to seal the hydraulic cylinder body 1 and the connection cover 4 so that the leaked oil flows into the interior of the connection cover 4;

[0029] like Figure 3 As shown, the sealing connection device 2 includes a thread groove 21, which is provided on the inner side of the outer periphery of the flange 5, a bolt 24 is movably provided in the through groove of the connection cover 4, a rubber sheet 22 is movably provided on the upper end of the flange 5, a slot 23 is provided on the inner side of the outer periphery of the rubber sheet 22, the slot 23 is aligned with the thread groove 21, a bolt 24 is inserted into the slot 23 and the inside of the thread groove 21, and the bolt 24 is threadedly connected with the thread groove 21, a gasket 25 is movably provided on the upper end of the connection cover 4, the bolt 24 is inserted into the inner side of the gasket 25, and is placed in the connection cover 4 through the rubber sheet 22, and the bolt 24 is inserted into the through groove of the connection cover 4 and the slot 23 of the rubber sheet 22, and is threadedly connected with the thread groove 21 in the flange 5, so as to realize the installation of the connection cover 4, and by tightening the bolt 24, the connection cover 4 squeezes the rubber sheet 22, so that the output end of the hydraulic cylinder body 1 is sealed and connected with the connection cover 4, thereby improving the detection accuracy of the oil leakage amount.

[0030] Furthermore, in order to reduce the error and make the detection more accurate, a leakage metering device 3 capable of measuring the leaked oil is provided at the upper end of the connection cover 4, which is used to observe the volume of the leaked oil and calculate the leakage amount;

[0031] like Figure 4As shown, the leakage metering device 3 includes an oil collection box 31, which is fixedly arranged at the upper end of the connecting cover 4, and the lower end of the oil collection box 31 is connected to the upper end of the connecting cover 4. A limit block 32 is fixedly arranged at the lower end of the inner wall of the oil collection box 31, and a rubber piston 33 is movably arranged inside the oil collection box 31. A slide rod 34 is fixedly arranged at the upper end of the rubber piston 33. The upper end of the oil collection box 31 passes through a limit sleeve 36, and the slide rod 34 passes through the inner side of the limit sleeve 36. The outer surface of the slide rod 34 The surface is provided with a scale line 35, which is connected through a fixed connection cover 4. Therefore, when the hydraulic cylinder body 1 is subjected to oil pressure from the pump station, the oil leaks from the position of the cylinder piston 7 and is collected by the connection cover 4 and the oil collecting box 31. The oil entering the oil collecting box 31 will push the rubber piston 33 and the slide rod 34 upward, so as to observe the scale line 35 on the upper end of the limit sleeve 36 and the surface of the slide rod 34, and then calculate the oil leakage in the cylinder, so as to reduce the error in observation caused by the oil contacting the scale oil pan.

[0032] The working principle is as follows: when the utility model is in use, the input end of the utility model is connected to the pump station, and the cylinder piston 7 in the utility model is pushed to the front end through the oil input from the pump station, and the flange 5 at the output end of the utility model is connected by the sealing connection device 2. The leaked oil is collected and calculated by the leakage metering device 3, thereby achieving the effect of leakage detection, reducing the trouble of connecting the pump station joints multiple times as a whole, and reducing the errors occurring during detection, making the detection more accurate.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for detecting leakage in a hydraulic hoist cylinder, comprising a hydraulic cylinder body (1), characterized in that: The output end of the hydraulic cylinder body (1) is fixedly provided with a flange (5), and the upper end of the flange (5) is movably provided with a connecting cover (4); The upper end of the hydraulic cylinder body (1) is provided with a sealing connection device (2) capable of sealingly connecting the connection cover (4) and the hydraulic cylinder body (1), and is used for sealingly connecting the hydraulic cylinder body (1) and the connection cover (4) so ​​that leaked oil flows into the interior of the connection cover (4); The sealing connection device (2) comprises a thread groove (21), the thread groove (21) is arranged on the inner side of the outer periphery of the flange (5), and a bolt (24) is movably arranged in the through groove of the connection cover (4); A leakage metering device (3) capable of measuring leaked oil is provided at the upper end of the connection cover (4), and is used to observe the volume of leaked oil and calculate the leakage amount.

2. A device for detecting leakage in a hydraulic hoist cylinder according to claim 1, characterized in that: A rubber sheet (22) is movably provided at the upper end of the flange (5), a slot (23) is provided on the inner side of the outer periphery of the rubber sheet (22), the slot (23) is aligned with the thread groove (21), the bolt (24) is inserted into the slot (23) and the thread groove (21), and the bolt (24) is threadedly connected to the thread groove (21).

3. A device for detecting leakage in a hydraulic hoist cylinder according to claim 1, characterized in that: A gasket (25) is movably provided on the upper end of the connection cover (4), and the bolt (24) is inserted into the inner side of the gasket (25).

4. A device for detecting leakage in a hydraulic hoist cylinder according to claim 1, characterized in that: The leakage metering device (3) comprises an oil collection box (31), the oil collection box (31) is fixedly arranged on the upper end of the connection cover (4), the lower end of the oil collection box (31) is connected to the upper end of the connection cover (4), and a limit block (32) is fixedly provided on the lower end of the inner wall of the oil collection box (31).

5. A device for detecting leakage in a hydraulic hoist cylinder according to claim 4, characterized in that: A rubber piston (33) is movably provided inside the oil collection box (31), and a sliding rod (34) is fixedly provided on the upper end of the rubber piston (33).

6. A device for detecting leakage in a hydraulic hoist cylinder according to claim 5, characterized in that: The upper end of the oil collection box (31) passes through a limiting sleeve (36), the sliding rod (34) passes through the inner side of the limiting sleeve (36), and the outer surface of the sliding rod (34) is provided with scale lines (35).

7. A device for detecting leakage in a hydraulic hoist cylinder according to claim 1, characterized in that: An oil chamber (6) is provided inside the hydraulic cylinder body (1), and a cylinder piston (7) is movably provided inside the oil chamber (6).

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