Off-line detection device for roller bending cylinders with different strokes

Abstract

The utility model discloses an off-line detection device for roller bending cylinders with different strokes, which is used for oil leakage detection of the roller bending cylinders and comprises a test base, a hydraulic pump and a pressure gauge. The roller bending cylinder comprises a cylinder barrel and a piston rod arranged in the cylinder barrel in a telescopic mode, an oil inlet is formed in the cylinder barrel, and oil enters the oil inlet to push the piston rod to slide outwards to stretch out of the cylinder barrel or slide inwards to retract into the cylinder barrel. An accommodating cavity matched with the cylinder barrel is formed in the test base, so that the cylinder barrel is inserted and fixed in the accommodating cavity, a flow channel is formed between the cylinder barrel and the inner wall of the accommodating cavity after the cylinder barrel is inserted, and the flow channel is communicated with the oil inlet; the hydraulic pump is inserted into the test base and is communicated with the flow channel; and the pressure gauge is inserted into the test base and is communicated with the flow channel. According to the utility model, the test base, the hydraulic pump and the pressure gauge are arranged to simulate a working environment when the roll bending cylinder works, so that oil leakage detection of the roll bending cylinder in an off-line state is realized, the use is convenient, and extra downtime caused by on-line detection is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of roller bending cylinder detection devices, in particular to an off-line detection device for roller bending cylinders with different strokes. Background Art

[0002] The bending roll cylinder is composed of a cylinder barrel, a piston rod, a spherical pad and a seal, and is fixed on the aluminum foil rolling mill arch. Since the aluminum foil rolling mill arch is in a humid, oxidative and high-temperature environment for a long time, and the working pressure needs to reach 300 bar, the seal is easily damaged, and the piston rod surface will also peel off, resulting in hydraulic oil leakage. Therefore, the bending roll cylinder needs to be replaced. After replacing the bending roll cylinder, the bending roll cylinder needs to be tested for oil leakage; in the prior art, the bending roll cylinder needs to be replaced first, and then an online oil leakage detection is performed. This oil leakage detection method will cause additional downtime, and if the replaced bending roll cylinder leaks oil, the bending roll cylinder needs to be replaced again, which reduces work efficiency and affects normal work; how to avoid downtime due to oil leakage detection after replacing the bending roll cylinder, thus giving rise to this case. Utility Model Content

[0003] The utility model aims to provide an off-line detection device for roll bending cylinders with different strokes, which performs off-line oil leakage detection before replacing the roll bending cylinder, so as to overcome the extra downtime caused by online oil leakage detection after replacing the roll bending cylinder.

[0004] To achieve the above-mentioned purpose, the solution of the utility model is: an off-line detection device for roll bending cylinders with different strokes, used for oil leakage detection of roll bending cylinders, including a test base, a hydraulic pump and a pressure gauge;

[0005] The roller bending cylinder comprises a cylinder barrel and a piston rod telescopically arranged in the cylinder barrel. The cylinder barrel is provided with an oil inlet, and oil is introduced into the oil inlet to push the piston rod to slide out of the cylinder barrel or slide inwardly to retract into the cylinder barrel.

[0006] A receiving cavity adapted to the cylinder is formed in the test base, so that the cylinder can be inserted and fixed in the receiving cavity, and a flow channel is formed between the cylinder and the inner wall of the receiving cavity after insertion, and the flow channel is connected with the oil inlet;

[0007] The hydraulic pump is plugged into the test base and connected to the flow channel;

[0008] The pressure gauge is plugged into the test base and communicated with the flow channel.

[0009] Furthermore, the cylinder barrel has two oil inlets, namely a first oil inlet and a second oil inlet. Oil is introduced into the first oil inlet to cause the piston rod to slide out of the cylinder barrel, and oil is introduced into the second oil inlet to cause the piston rod to slide inward and retract into the cylinder barrel.

[0010] There are also two flow channels, namely a first flow channel and a second flow channel, the first flow channel is connected to the first oil inlet, and the second flow channel is connected to the second oil inlet;

[0011] The hydraulic pump is plugged into the test base and communicated with the first flow channel or the second flow channel;

[0012] The pressure gauge is plugged into the test base and communicated with the first flow channel or the second flow channel.

[0013] Furthermore, a first oil injection port and a second oil injection port are formed on the side wall of the test base, the first oil injection port is communicated with the first flow channel, the second oil injection port is communicated with the second flow channel, and the output end of the hydraulic pump is detachably mounted on the first oil injection port or the second oil injection port;

[0014] A first pressure measuring interface and a second pressure measuring interface are also formed on the side wall of the test base. The first pressure measuring interface is connected to the first flow channel, and the second pressure measuring interface is connected to the second flow channel. The pressure gauge is detachably installed on the first pressure measuring interface or the second pressure measuring interface.

[0015] Furthermore, the cylinder barrel is a cylindrical structure, a socket is formed on the top side of the cylinder barrel for the piston rod to extend or retract, the piston rod is sealed with the socket, a piston head is formed on the bottom side of the piston rod, the piston head is sealed with the inner cavity of the cylinder barrel, and reciprocates between the first oil inlet and the second oil inlet;

[0016] The bottom side of the cylinder is open to form the first oil inlet, and the bottom wall of the accommodating cavity is formed with a first oil groove, so that when the cylinder is inserted into the accommodating cavity, the first flow channel is formed between the first oil groove and the bottom side of the cylinder, and the first flow channel extends to the first oil inlet and communicates with the first oil inlet;

[0017] The second oil inlet is provided on the side wall of the cylinder, and a second oil groove is formed on the outer side wall of the cylinder. The second oil groove extends to the second oil inlet, so that when the cylinder is inserted into the accommodating cavity, the second flow channel is formed between the second oil groove and the accommodating cavity.

[0018] Furthermore, it also includes a gasket, which is a circular ring structure with a through hole formed in the middle and is placed on the bottom wall of the accommodating cavity to raise the bending roller cylinder. The first flow channel extends to the through hole and is connected to the first oil inlet.

[0019] Furthermore, the number of the second oil inlets is multiple, the second oil groove is arranged around the outer circumference of the cylinder, and the multiple second oil inlets are arranged at intervals along the annular path of the second oil groove.

[0020] Furthermore, the accommodating chamber and the cylinder barrel are connected by threads, so that the roller bending cylinder is fixed on the test base.

[0021] After adopting the above scheme, the beneficial effects of the utility model are:

[0022] (1) The utility model provides a test base into which a roll bending cylinder can be inserted and fixed so as to realize offline detection of whether the roll bending cylinder has oil leakage. An oil inlet is provided on the cylinder barrel of the roll bending cylinder. Oil entering the oil inlet causes the piston head to push the piston rod out of the cylinder barrel or retract into the cylinder barrel. When the roll bending cylinder is inserted into and fixed in the accommodating cavity of the test base, a flow channel is formed between the roll bending cylinder and the accommodating cavity, and the flow channel is connected to the oil inlet. The hydraulic pump is plugged into the test base and connected to the flow channel to fill the oil inlet with oil and pressurize it. In addition, a pressure gauge is plugged into the test base and connected to the flow channel to monitor the pressure applied by the hydraulic pump to the roll bending cylinder so as to determine whether the predetermined working pressure can be reached to judge whether there is oil leakage. Offline detection is realized, which is convenient to use and avoids extra downtime caused by online detection.

[0023] (2) Furthermore, the cylinder of the utility model is provided with a first oil inlet and a second oil inlet. Accordingly, when the cylinder is inserted into the test base, a first flow channel and a second flow channel are formed between the cylinder and the accommodating cavity. The first flow channel is connected to the first oil inlet, and the second flow channel is connected to the second oil inlet. The hydraulic pump injects oil from the first flow channel to the first oil inlet and applies pressure, so that the piston rod slides outward and extends out of the cylinder. When the pressure gauge reaches a predetermined working pressure, the second oil inlet is observed to see whether oil leaks, so as to determine whether the piston rod leaks during the outward sliding process; or the hydraulic pump injects oil from the second flow channel to the second oil inlet and applies pressure, so that the piston rod slides inward and retracts into the cylinder. When the pressure gauge reaches a predetermined working pressure, the first oil inlet is observed to see whether oil leaks, so as to determine whether the piston rod leaks during the inward sliding process. Off-line detection is realized, which is convenient to use and avoids extra downtime caused by online detection.

[0024] (3) By placing a gasket or multiple gaskets on the bottom wall of the test base, it is possible to adapt to different sizes of roll bending cylinders for oil leakage detection, and is suitable for roll bending cylinders of different specifications and different strokes. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0026] Figure 2 It is a three-dimensional exploded structural schematic diagram of the utility model.

[0027] Figure 3 It is a cross-sectional schematic diagram of the utility model when the bending roller cylinder is inserted into a test base.

[0028] Figure 4 It is a schematic diagram of the cross-sectional structure of the utility model when the roller bending cylinder is inserted into the test base and the piston rod is extended.

[0029] Figure 5 It is a schematic diagram of the cross-sectional structure of the cylinder barrel of the utility model.

[0030] Figure 6It is a schematic diagram of the cross-sectional structure of the test base of the utility model.

[0031] Description of labels:

[0032] 1-bending roller cylinder, 2-test base, 3-hydraulic pump, 4-pressure gauge, 5-cylinder barrel, 6-piston rod, 7-piston head, 8-oil inlet, 9-accommodating chamber, 10-flow channel, 11-first oil groove, 12-second oil groove, 13-gasket, 14-first oil filling port, 15-second oil filling port, 16-first pressure measuring interface, 17-second pressure measuring interface, 18-seal, 51-socket, 52-inner cavity, 53 external thread, 81-first oil inlet, 82-second oil inlet, 91-internal thread, 101-first flow channel, 102-second flow channel, 131-through hole. DETAILED DESCRIPTION

[0033] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] like Figures 1 to 6 As shown, the utility model provides an off-line detection device for roll bending cylinders with different strokes to simulate the working conditions of the roll bending cylinder 1 when it is working, so as to realize off-line oil leakage detection of the roll bending cylinder 1, including a test base 2, a hydraulic pump 3 and a pressure gauge 4;

[0035] The roll bending cylinder 1 comprises a cylinder barrel 5 and a piston rod 6 which is telescopically arranged in the cylinder barrel 5. The cylinder barrel 5 is provided with an oil inlet 8, and oil is introduced into the oil inlet 8 to push the piston rod 6 to slide out of the cylinder barrel 5 or slide back into the cylinder barrel 5.

[0036] The test base 2 is formed with a receiving cavity 9 adapted to the cylinder 5, so that the cylinder 5 can be inserted and fixed in the receiving cavity 9. Specifically, the inner cavity of the receiving cavity 9 is consistent with the outer contour of the cylinder 5. When the cylinder 5 is inserted into the receiving cavity 9, a flow channel 10 is formed between the cylinder 5 and the inner wall of the receiving cavity 9, and the flow channel 10 is connected with the oil inlet 8.

[0037] The hydraulic pump 3 is used to inject oil and pressurize the bending cylinder 2, is plugged into the test base 2, and is connected to the flow channel 10; the hydraulic pump 3 is a hand-operated hydraulic pump, but is not limited thereto.

[0038] The pressure gauge 4 is used to be plugged into the test base 2 and connected to the flow channel 10, and is used to display the pressure applied by the hydraulic pump 3 to the roll bending cylinder 2 to determine whether the pressure applied by the hydraulic pump 3 reaches the pressure reached when the roll bending cylinder 1 is working. If the working pressure cannot be reached, it indicates that there is an oil leakage.

[0039] In this specific embodiment, Figure 3As shown, the number of oil inlets 8 of the cylinder 5 is two, namely the first oil inlet 81 and the second oil inlet 82. Oil entering the first oil inlet 81 causes the piston rod 6 to slide outward and extend out of the cylinder 5, and oil entering the second oil inlet 82 causes the piston rod 6 to slide inward and retract into the cylinder 5. Correspondingly, the number of flow channels 10 is also two, namely the first flow channel 101 and the second flow channel 102. The first flow channel 101 is connected to the first oil inlet 81, and the second flow channel is connected to the second oil inlet 82; the hydraulic pump 3 is plugged into the test base 2, and is in circulation with the first flow channel 101 or is connected with the second flow channel; the pressure gauge is plugged into the test base 2, and is connected with the first flow channel 101 or the second flow channel 102.

[0040] In this specific embodiment, Figure 6 As shown, in order to enable the hydraulic pump 3 to communicate with the flow channel 10, a first oil injection port 14 and a second oil injection port 15 are formed on the side wall of the test base 2, the first oil injection port 14 is connected to the first flow channel 101, the second oil injection port 15 is connected to the second flow channel 102, and the hydraulic pump 3 is detachably mounted on the first oil injection port 14 or the second oil injection port 15; in order to enable the pressure gauge 4 to communicate with the flow channel 10, a first pressure measuring interface 16 and a second pressure measuring interface 17 are also formed on the side wall of the test base 2, the first pressure measuring interface 16 is connected to the first flow channel 101, the second pressure measuring interface 17 is connected to the second flow channel 102, and the pressure gauge 4 is detachably mounted on the first pressure measuring interface 16 or the second pressure measuring interface 17. Specifically, the hydraulic pump 3 is connected to the first oil injection port 14 or the second oil injection port 15 by threads, and the pressure gauge 4 is connected to the first pressure measuring interface 16 or the second pressure measuring interface 17 by threads. Of course, in other embodiments, other connections can also be used, not limited to this.

[0041] By setting two oil inlets 8, the cylinder 5 can simultaneously realize the oil leakage test of the two movement processes of the piston rod 6 sliding outward or inward. Specifically, when the hydraulic pump 3 injects oil and pressurizes the first oil inlet 81 through the first flow channel 101, the oil leakage in the process of the piston rod 6 sliding outward and extending can be tested; correspondingly, the pressure gauge 4 is simultaneously in communication with the first flow 101 to test the pressure of the hydraulic pump 3 injecting oil and pressurizing the first oil inlet 81; when the hydraulic pump 3 injects oil and pressurizes the second oil inlet 82 through the second flow channel 102, the oil leakage in the process of the piston rod 6 sliding inward and retracting can be tested. Correspondingly, the pressure gauge 4 is simultaneously in communication with the second flow 102 to test the pressure of the hydraulic pump 3 injecting oil and pressurizing the second oil inlet 82, which is easy to use.

[0042] In order to ensure that when the hydraulic pump 3 is screwed to the first oil filling port 14 or the second oil filling port 15, the other oil filling port can remain closed to prevent dust from entering the accommodating cavity 9 of the test base 2, a seal 18 is also provided to block one of the oil filling ports or the pressure measuring interface.

[0043] In this specific embodiment, Figure 5As shown, the cylinder 5 is a cylindrical structure, and a socket 51 is formed on the top side thereof for the piston rod 6 to extend or retract. The piston rod 6 is sealed with the socket 51, and a piston head 7 is formed at the bottom end of the piston rod 6. The piston head 7 is sealed with the inner cavity 52 of the cylinder 5 and reciprocates between the first oil inlet 81 and the second oil inlet 82 of the cylinder 5; the bottom side of the cylinder 5 is open to form the first oil inlet 81, and a first oil groove 11 is formed on the bottom wall of the accommodating cavity 9, so that when the cylinder 5 is inserted into the accommodating cavity 9, a first flow channel 101 is formed between the first oil groove 11 and the cylinder 5, and the first flow channel 101 extends to the first oil inlet 81 and is connected with the first oil inlet 81;

[0044] The second oil inlet 82 is formed below the socket 51 of the cylinder 5, and a second oil groove 12 is formed on the outer wall of the cylinder 5. The second oil groove 12 extends to the second oil port 82, so that when the cylinder 5 is inserted into the accommodating cavity 9, a second flow channel 102 is formed between the second oil groove 12 and the accommodating cavity 9.

[0045] Furthermore, there are multiple second oil inlets 82, and the second oil groove is arranged around the outer circumference of the cylinder 5. The multiple second oil inlets 82 are arranged at intervals along the annular path of the second oil groove 12, which is more convenient for pressurized oil injection.

[0046] In the specific test process, since the roll bending cylinder 1 includes a long-stroke roll bending cylinder 1 and a short-stroke roll bending cylinder 1, the difference between the long-stroke roll bending cylinder 1 and the short-stroke roll bending cylinder 1 is that the length size is inconsistent, and the length of the long-stroke roll bending cylinder 1 is greater than the length of the short-stroke roll bending cylinder 1. In order to adapt to the test of roll bending cylinders 1 with different strokes, the device also includes a gasket 13, which is an annular structure, and a through hole 131 is formed in the middle, and is placed in the accommodating chamber 9 to raise the roll bending cylinder 1. The first flow channel 101 extends to the through hole 131 of the gasket 13 and is connected to the first oil inlet 81. When the roll bending cylinder 1 to be tested is a short-stroke roll bending cylinder 1, the gasket 13 is placed on the bottom side of the accommodating chamber 9 to raise the short-stroke roll bending cylinder 1. Of course, the number of gaskets 1 can be adaptively adjusted according to the length size of the roll bending cylinder 1; when the roll bending cylinder 1 to be tested is a long-stroke roll bending cylinder 1 with the same size as the test base, the gasket 13 is not required.

[0047] In this specific embodiment, the accommodating chamber 9 and the cylinder barrel 5 are connected by threads, so that the bending roller cylinder 1 is fixed on the test base 2. Specifically, the inner wall of the accommodating chamber 9 is formed with an internal thread 91, and the outer wall of the cylinder barrel 5 is formed with an external thread 53. Of course, in other embodiments, other fixing methods can also be used, such as clamping, etc., which are not limited thereto.

[0048] Oil leakage test process during the extension of piston rod 6:

[0049] According to the stroke of the roll bending cylinder 1, first determine whether to place the gasket 13, then insert the roll bending cylinder 1 into the test base 2, and screw it into the accommodating cavity 9, then screw the hydraulic pump 3 into the first oil filling port 14, and screw the pressure gauge 4 into the first pressure measuring interface 16 (such as Figure 1 As shown), the hand-cranked hydraulic pump 3 is used to pressurize and inject oil into the first oil filling port 14. The hydraulic oil flows through the first oil filling port 14 through the first flow channel 101, enters the first oil inlet 81, and is pressurized and injected from the bottom side of the cylinder 5, pushing the piston head 7 to slide outward, driving the piston rod 6 to extend out of the bending roller cylinder 1 until it is fully extended. At the same time, the pressure gauge 4 is observed to observe whether the pressure displayed on the pressure gauge 4 reaches the established working pressure. When the established working pressure is reached, observe whether there is hydraulic oil leakage on the test base 2. If oil leakage occurs, perform an oil leakage test on the next bending roller cylinder 1. If no oil leakage occurs, perform an oil leakage test on the bending roller cylinder 1 during the retraction process of the piston rod 6.

[0050] Oil leakage test process during the retraction of piston rod 6:

[0051] When the piston rod 6 is fully extended out of the bending roll cylinder 1 and the oil leakage test is completed, manual pressure relief is performed first, and then the hydraulic pump 3 is removed from the first oil filling port 14 and screwed to the second oil filling port 15. At the same time, the first oil filling port 14 is sealed with a seal 18, and the pressure gauge 4 is removed from the first pressure measuring interface 16 and screwed to the second pressure measuring interface 17. At the same time, the first pressure measuring interface 16 is sealed with a seal 18. The hydraulic pump 3 is hand-cranked to pressurize and inject oil into the second oil filling port 15. The hydraulic oil flows through the second oil filling port 15 through the second flow channel 102 and enters the second oil inlet 82, pushing the piston head 7 to slide inward from the bottom of the socket 51, driving the piston rod 6 to retract into the bending roll cylinder 1, and observing the pressure gauge 4 at the same time to observe whether the pressure displayed on the pressure gauge 4 reaches the established working pressure. When the established working pressure is reached, observe whether there is hydraulic oil leakage on the test base 2. If there is no oil leakage, the product is qualified; if there is oil leakage, the product is unqualified, and the test is completed.

[0052] In the claims, specification and the above-mentioned drawings of the utility model, unless otherwise explicitly defined, directional words, such as the use of terms such as "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise" and the like to indicate directions or positional relationships are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation or be constructed and operated in a specific orientation, so they cannot be understood as limiting the specific protection scope of the utility model.

[0053] The above description is only a preferred embodiment of the present utility model and is not a limitation on the design of the present case. Any equivalent changes made based on the key design of the present case shall fall within the protection scope of the present case.

Claims

1. An off-line detection device for roll bending cylinders with different strokes, used for oil leakage detection of roll bending cylinders (1), characterized in that: It comprises a test base (2), a hydraulic pump (3) and a pressure gauge (4); The roller bending cylinder (1) comprises a cylinder barrel (5) and a piston rod (6) telescopically arranged in the cylinder barrel (5); an oil inlet (8) is arranged on the cylinder barrel (5); oil is introduced into the oil inlet (8) to push the piston rod (6) to slide out of the cylinder barrel (5) or to slide inwardly to retract into the cylinder barrel (5); A receiving cavity (9) adapted to the cylinder (5) is formed in the test base (2) so that the cylinder (5) can be inserted into and fixed in the receiving cavity (9), and a flow channel (10) is formed between the cylinder (5) and the inner wall of the receiving cavity (9) after the cylinder (5) is inserted, and the flow channel (10) is communicated with the oil inlet (8); The hydraulic pump (3) is plugged into the test base (2) and communicated with the flow channel (10); The pressure gauge (4) is plugged into the test base (2) and is connected to the flow channel (10).

2. The off-line detection device for roll bending cylinders with different strokes according to claim 1 is characterized in that: The cylinder barrel (5) has two oil inlets (8), namely a first oil inlet (81) and a second oil inlet (82). Oil is introduced into the first oil inlet (81) to cause the piston rod (6) to slide out of the cylinder barrel (5), while oil is introduced into the second oil inlet (82) to cause the piston rod (6) to slide inward and retract into the cylinder barrel (5). The number of flow channels (10) is also two, namely a first flow channel (101) and a second flow channel (102); the first flow channel (101) is connected to the first oil inlet (81), and the second flow channel (102) is connected to the second oil inlet (82); The hydraulic pump (3) is plugged into the test base (2) and communicates with the first flow channel (101) or the second flow channel (102); The pressure gauge (4) is plugged into the test base (2) and is connected to the first flow channel (101) or the second flow channel (102).

3. The off-line detection device for roll bending cylinders with different strokes according to claim 2 is characterized in that: A first oil injection port (14) and a second oil injection port (15) are formed on the side wall of the test base (2); the first oil injection port (14) is in communication with the first flow channel (101), and the second oil injection port (15) is in communication with the second flow channel (102); and the output end (31) of the hydraulic pump (3) is detachably mounted on the first oil injection port (14) or the second oil injection port (15); A first pressure measuring interface (16) and a second pressure measuring interface (17) are also formed on the side wall of the test base (2); the first pressure measuring interface (16) is connected to the first flow channel (101), and the second pressure measuring interface (17) is connected to the second flow channel (102); the pressure gauge (4) is detachably mounted on the first pressure measuring interface (16) or the second pressure measuring interface (17).

4. The off-line detection device for roll bending cylinders with different strokes according to claim 2 is characterized in that: The cylinder barrel (5) is of cylindrical structure, and a socket (51) is formed on the top side of the cylinder barrel (5) for the piston rod (6) to extend or retract, the piston rod (6) and the socket (51) are in sealing cooperation, and a piston head (7) is formed on the bottom side of the piston rod (6), the piston head (7) is in sealing cooperation with the inner cavity (52) of the cylinder barrel (5), and reciprocates between the first oil inlet (81) and the second oil inlet (82); The bottom side of the cylinder barrel (5) is open to form the first oil inlet (81), and the bottom wall of the accommodating chamber (9) is formed with a first oil groove (11), so that when the cylinder barrel (5) is inserted into the accommodating chamber (9), the first flow channel (101) is formed between the first oil groove (11) and the bottom side of the cylinder barrel (5), and the first flow channel (101) extends to the first oil inlet (81) and is in communication with the first oil inlet (81); The second oil inlet (82) is provided on the side wall of the cylinder barrel (5), and a second oil groove (12) is formed on the outer side wall of the cylinder barrel (5). The second oil groove (12) extends to the second oil inlet (82), so that when the cylinder barrel (5) is inserted into the accommodating chamber (9), the second flow channel (102) is formed between the second oil groove (12) and the accommodating chamber (9).

5. The off-line detection device for roll bending cylinders with different strokes according to claim 4 is characterized in that: It also includes a gasket (13), which is in the form of a circular ring structure, with a through hole (131) formed in the middle thereof, and is placed on the bottom wall of the accommodating chamber (9) to raise the roller bending cylinder (1), and the first flow channel (101) extends to the through hole (131) and is connected to the first oil inlet (81).

6. The off-line detection device for roll bending cylinders with different strokes according to claim 4 is characterized in that: The number of the second oil inlets (82) is multiple, the second oil groove (12) is arranged around the outer circumference of the cylinder (5), and the multiple second oil inlets (82) are arranged at intervals along the annular path of the second oil groove (12).

7. The off-line detection device for roll bending cylinders with different strokes according to claim 1 is characterized in that: The accommodating chamber (9) and the cylinder barrel (5) are connected via threads, so that the roller bending cylinder (1) is fixed on the test base (2).

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