Hydraulic cylinder detection device and detection method thereof

Abstract

The present application relates to the field of detection devices, and in particular to a hydraulic cylinder detection device and a detection method thereof, comprising: a detection table for placing two hydraulic cylinders along a first direction, two slide rails, the two slide rails being parallel to each other and both extending along the first direction; two connecting assemblies, the two connecting assemblies being respectively attached to the two hydraulic cylinders, wherein the hydraulic cylinders and the connecting assemblies attached thereto are kept relatively positioned along the first direction, and the two connecting assemblies are respectively slidably arranged on the two slide rails along the first direction; a distance measuring assembly, comprising a distance measuring device and a reference member; the distance measuring device and the reference member are respectively connected to the two connecting assemblies, wherein the distance measuring device and the reference member are spaced apart from each other at least in the first direction; the distance measuring device is used for real-time detection of the distance between the distance measuring device and the reference member in the first direction; not only can real-time detection of the telescopic synchronization of the two hydraulic cylinders be achieved, but also, only one distance measuring assembly is used for the detection process.

Description

Technical Field

[0001] The present application relates to the field of detection devices, and in particular to a hydraulic cylinder detection device and a detection method thereof. Background Art

[0002] As a common linear drive component, the hydraulic cylinder mainly uses hydraulic oil to push its piston rod to reciprocate and extend linearly to achieve linear drive.

[0003] In some working conditions, it is sometimes necessary to use two hydraulic cylinders that move synchronously to perform the same action. This requires that the extension and retraction speeds of the two hydraulic cylinders must always be kept basically the same. Therefore, before using such dual hydraulic cylinders, their extension and retraction speeds need to be tested. During the test, the same driving oil pressure is applied to the two hydraulic cylinders to control the synchronous and uniform extension and retraction of the two hydraulic cylinders. During the extension and retraction process, the extension and retraction speeds of the two hydraulic cylinders are tested in real time to determine whether the speeds of the two hydraulic cylinders are the same, thereby judging the synchronization of the two hydraulic cylinders. Based on this, how to design a detection device that can simultaneously detect the synchronization of two hydraulic cylinders has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0004] In order to solve at least one of the technical problems mentioned in the background technology, the purpose of this application is to provide a hydraulic cylinder detection device.

[0005] To achieve the above objectives, this application provides the following technical solutions.

[0006] In one aspect, the present application provides a hydraulic cylinder detection device for detecting the telescopic synchronization of two hydraulic cylinders, comprising:

[0007] A testing platform, for placing two hydraulic cylinders along a first direction;

[0008] Two slide rails, the two slide rails are parallel to each other and extend along a first direction;

[0009] Two connecting assemblies, the two connecting assemblies are respectively attached to the two hydraulic cylinders, wherein the hydraulic cylinders and the connecting assemblies attached thereto are relatively positioned along a first direction, and the two connecting assemblies are respectively slidably arranged on the two slide rails along the first direction;

[0010] The distance measuring assembly includes a distance measuring device and a reference member; the distance measuring device and the reference member are respectively connected to two connecting assemblies, wherein the distance measuring device and the reference member are spaced apart from each other at least in a first direction; the distance measuring device is used to detect the distance between the distance measuring device and the reference member in the first direction in real time.

[0011] As an optional embodiment of the present application, the device also includes a controller and a warning device, and the controller is configured so that when D≥S, the warning device sends a warning signal; wherein S is a preset value, D=|D2-D1|, wherein D1 is the distance between the distance measuring device in the first direction in the initial state; and D2 is the real-time distance between the reference part and the distance measuring device in the first direction measured by the distance measuring device during the detection process.

[0012] As an optional embodiment of the present application, the connecting assembly is attached to the piston rod of the hydraulic cylinder through the attachment assembly; the attachment assembly includes an I-shaped wheel sleeved on the piston rod, and the connecting assembly includes a vertical rod, and rollers are provided on both sides of the vertical rod, and the two rollers are respectively abutted against the inner side walls of the wheel plates on both sides of the I-shaped wheel.

[0013] As an optional embodiment of the present application, at least one of the two rollers can move along the first direction to form a movable roller; the vertical pole is also provided with a driving component that drives the movable roller to move along the first direction.

[0014] As an optional embodiment of the present application, the driving assembly includes a first screw and a movable shaft, and a vertically extending channel is also provided in the vertical pole; the first screw is threadedly connected to the end of the vertical pole, and the outer peripheral wall of the lower end of the first screw is a conical surface that gradually narrows downward; the movable shaft is movably arranged on the vertical pole along the first direction, one end of which is connected to the movable roller, and the other end is against the conical surface.

[0015] As an optional embodiment of the present application, a vertically extending guide rod is fixedly connected in the channel, and the guide rod is movably arranged on the first screw rod in the vertical direction.

[0016] As an optional embodiment of the present application, the I-shaped wheel includes two half-wheel bodies, one end of the two half-wheel bodies is hinged to each other, and the other end is locked by a locking member.

[0017] As an optional embodiment of the present application, the locking member includes a second screw, a first nut, and a tensioning plate with a U-shaped bayonet; one of the tensioning plate and the second screw is hinged to one of the half-wheel bodies, and the other is fixed to the other half-wheel body; the second screw is embedded in the U-shaped bayonet of the tensioning plate and is locked by the first nut.

[0018] As an optional embodiment of the present application, the connecting assembly also includes a sleeve and a cross bar that can be axially extended and retracted relative to each other, one section of the sleeve is slidably connected to the slide rail, and the cross bar is fixed to the vertical pole; a locking member is provided between the sleeve and the cross bar for locking the two.

[0019] On the other hand, the present application also provides a method for detecting a hydraulic cylinder, which is performed using the aforementioned detection device.

[0020] Compared with the prior art, this application has the following beneficial effects:

[0021] Not only can the real-time detection of the extension and contraction synchronization of the two hydraulic cylinders be achieved; moreover, only one distance measuring component is used during the detection process, without the need for the use of multiple distance measuring components.

[0022] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present application, nor is it intended to limit the scope of the present application. Other features of the present application will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and other objects, features and advantages of the exemplary embodiments of the present application will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present application are shown in an illustrative and non-limiting manner, in which:

[0024] In the drawings, the same or corresponding reference numerals denote the same or corresponding parts.

[0025] Figure 1 This is a schematic diagram of the structure of this application;

[0026] Figure 2 A top view of the present application;

[0027] Figure 3 It is a schematic diagram of the local structure of the connection component;

[0028] Figure 4 Schematic diagram of the structure of the attachment component Figure 1 ;

[0029] Figure 5 Schematic diagram of the structure of the attachment component Figure 2 ;

[0030] Figure 6 It is the axial cross-section of the vertical pole.

[0031] Description of the numbers in the figure:

[0032] M, hydraulic cylinder; M1, piston rod;

[0033] 1. Testing table;

[0034] 2. Slide rail; 21. Slider;

[0035] 3. Connecting assembly; 31. Vertical rod; 32. Roller; 33. Movable shaft; 34. First screw; 35. Crossbar; 351. Third screw; 352. Second nut; 36. Sleeve; 361. Through slot; 37. Guide rod;

[0036] 4. Distance measuring assembly; 41. Distance measuring device; 42. Reference piece; 43. Connecting frame;

[0037] 5. Attachment assembly; 50. I-shaped pulley; 51. Half wheel body; 511. Rubber pad; 512. Hinge; 52. Locking member; 521. Second screw; 522. Tension plate; 523. First nut. DETAILED DESCRIPTION

[0038] In order to make the purpose, features, and advantages of this application more obvious and easy to understand, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of this application.

[0039] Example 1

[0040] Reference Figure 1-6 As shown, this embodiment provides a hydraulic cylinder detection device, which is primarily used to detect the synchronization of the extension and retraction of two hydraulic cylinders M1. Extension and retraction synchronization refers to the synchronization of the extension and retraction speeds of the piston rods M1 of the two hydraulic cylinders M1 under the action of the same driving oil pressure. It is understood that both hydraulic cylinders M1 operate at a uniform speed.

[0041] like Figure 1 As shown, the device mainly includes a detection platform 1, two slide rails 2, two connecting components 3 and a distance measuring component 4.

[0042] The testing platform 1 is primarily used to position the two hydraulic cylinders M1 along a first direction. The first direction can be vertical or horizontal. For example, in this embodiment, the testing platform 1 is horizontally arranged, and the two first hydraulic cylinders M1 are placed horizontally and parallel to each other on the testing platform 1. In this case, the first direction can be understood as the axial direction of the hydraulic cylinders M1.

[0043] The two slide rails 2 are fixed on the inspection platform 1 in parallel and side by side, and both slide rails 2 extend along the first direction.

[0044] The two connecting components 3 are respectively attached to the piston rods M1 of the two hydraulic cylinders M1 , that is, one connecting component 3 corresponds to one hydraulic cylinder M1 .

[0045] The piston rod M1 of the hydraulic cylinder M1 and the connecting component 3 attached thereto maintain relative positioning along the first direction, that is, the connecting component 3 and the piston rod M1 of the hydraulic cylinder M1 attached thereto move synchronously along the first direction, or in other words, in the first direction, the piston rod M1 and the connecting component 3 remain relatively stationary, and at this time, the extension and retraction speed of the piston rod M1 is equivalent to the travel speed of the connecting component 3.

[0046] In addition, the two connecting components 3 are respectively slidably arranged on the two slide rails 2 along the first direction, and the slide rails 2 are mainly used to guide the connecting components 3 to move along the first direction.

[0047] The distance measuring component 4 includes a distance measuring device 41 and a reference member 42. In some embodiments, the distance measuring component 4 uses a laser rangefinder. In this case, the reference member 42 can be a reflector for reflecting the laser output by the laser rangefinder to achieve distance measurement.

[0048] The distance measuring device 41 and the reference member 42 are connected to the two connecting components 3 respectively, wherein the distance measuring component 4 and the reference member 42 are spaced apart from each other at least in the first direction; that is, Figure 2 As shown, in the first direction, the distance measuring component 4 and the reference piece 42 are one in front of the other, and the distance measuring component 4 emits laser toward the reference piece 42 along the first direction to detect the distance between the distance measuring device 41 and the reference piece 42 in the first direction in real time.

[0049] The reference piece 42 is at least partially located in the laser irradiation path of the distance measuring assembly 4 to reflect the laser light, so that the distance measuring device 41 detects the distance between the rangefinder and the reference piece 42 in the first direction in real time.

[0050] In some embodiments, the laser rangefinder is fixed to one of the connection components 3 via a connecting frame 43 , and the reference member 42 is fixed to the other connection component 3 .

[0051] In some embodiments, the device further includes a controller and a warning device, and the controller is configured such that when D ≥ S, the warning device sends a warning signal, where the warning signal can be a light signal or a sound signal. For example, the warning device can use a warning light to emit light as a warning signal, or the warning device can use a buzzer to emit sound as a warning signal.

[0052] Wherein S is a preset value. In some embodiments, S may be less than or equal to 8 mm, and is generally set to 5 mm, 3 mm, etc.

[0053] In addition, D=|D2-D1|, that is, D is the absolute value of the difference between D2 and D1. In this formula, Figure 2As shown, D1 is the distance between the distance measuring device 41 in the first direction in the initial state. The initial state here refers to the state where the two connecting components 3 are attached to the two hydraulic cylinders M1 and the hydraulic cylinders M1 have not started to move.

[0054] D2 is the real-time distance between the reference member 42 and the distance measuring device 41 in the first direction measured by the distance measuring device 41 during the detection process.

[0055] That is to say, when D≥S, it indicates that the difference in the extension and contraction speed of the piston rods M1 of the two hydraulic cylinders M1 exceeds the set range and does not meet the requirements. At this time, the controller will control the warning device to send a warning signal to remind the staff.

[0056] On the contrary, when D<S, the difference in the extension and contraction speeds of the two piston rods M1 on the surface is within a reasonable error range and meets the requirements. At this time, the warning device does not generate a warning signal.

[0057] To understand this from another perspective, assuming the piston rods M1 of the two hydraulic cylinders M1 have the same extension and retraction speed, the real-time distance D2 between the distance measuring device 41 and the reference member 42 will remain essentially unchanged during the movement of the piston rods M1, essentially equal to D1. If the speeds of the two piston rods M1 differ, the real-time distance D2 will decrease or increase relative to D1. When the speed difference between the two piston rods M1 is significant, the decrease or increase in the real-time distance D2 relative to D1 may exceed the set value S.

[0058] As can be seen, in this embodiment, not only can the synchronization of the extension and retraction of the two hydraulic cylinders M1 be detected in real time, but this can also be achieved using only one distance measuring assembly 4. Conventional speed detection methods require at least two distance measuring assemblies 4 to detect the speeds of the two hydraulic cylinders M1 separately, and then compare the two speeds to obtain a detection result. However, in this embodiment, this can be achieved using only one distance measuring assembly 4.

[0059] It is understandable that during the extension and retraction process, the piston rod M1 of the hydraulic cylinder M1 will rotate to a certain extent, that is, the rod body of the piston rod M1 will rotate to a certain extent. If the connecting component 3 is directly fixed to the piston rod M1, a certain torque will be generated on the connecting component 3 during the rotation of the piston rod M1, thereby damaging the connecting component 3. Based on this, in this embodiment, the connecting component 3 is attached to the piston rod M1 of the hydraulic cylinder M1 through the attachment component 5. Specifically:

[0060] like Figure 4 and Figure 5 As shown, the attachment assembly 5 includes an I-shaped wheel 50 sleeved on the piston rod M1 of the hydraulic cylinder M1. The I-shaped wheel 50 is tightly attached to the piston rod M1. The I-shaped wheel 50 refers to a wheel body with an I-shaped cross section.

[0061] like Figure 6 As shown, the connecting component 3 includes a vertical rod 31, and rollers 32 are provided on both sides of the vertical rod 31. The two rollers 32 respectively abut against the inner side walls of the wheel plates on both sides of the I-shaped wheel 50. In this way, the connecting component 3 is equivalent to being in contact with the I-shaped wheel 50 through the rollers 32. In this way, when the I-shaped wheel 50 rotates with the piston rod M1, the rollers 32 roll against the I-shaped wheel 50. In this way, when the I-shaped wheel 50 moves forward or backward with the piston rod M1, it can push the vertical rod 31 forward or backward, so that the connecting component 3 maintains a relative positioning with the vertical rod 31 in the first direction.

[0062] In order to make the two rollers 32 close to each other between the two side plates of the spool 50, at least one of the two rollers 32 can be movable along the first direction to form a movable roller 32; for example, in this embodiment Figure 6 It is shown that the roller 32 on the left is directly installed on the vertical rod 31, and the roller 32 on the right is on the opposite side of the left roller 32 and can move along the first direction to serve as a movable roller. In addition, a driving component for driving the movable roller 32 to move along the first direction is also provided on the vertical rod 31.

[0063] In some embodiments, such as Figure 6 As shown, the drive assembly includes a first screw 34 and a movable shaft 33. A vertically extending channel is also provided in the vertical rod 31. The first screw 34 is threadedly connected to the end of the vertical rod 31 and passes through the channel. The outer peripheral wall of the lower end of the first screw 34 is a tapered surface that gradually narrows downward. The movable shaft 33 is movably provided on the vertical rod 31 along a first direction, with one end connected to the movable roller 32 and the other end abutting against the tapered surface. Thus, when the vertical rod 31 with the two rollers 32 enters the wheel groove of the I-shaped wheel 50, the first screw 34 is rotated to move the first screw 34 downward. As the first screw 34 moves downward, the tapered surface on the first screw 34 gradually pushes the movable shaft 33 outward, causing the movable shaft 33 to drive the rollers 32 to gradually abut against the wheel plates of the I-shaped wheel 50 in the first direction, thereby causing the two rollers 32 to abut against the inner side surfaces of the wheel plates on both sides of the I-shaped wheel 50.

[0064] In order to provide a certain guiding and supporting function for the first screw rod 34 , a vertically extending guide rod 37 is fixedly connected in the channel. The guide rod 37 is movably vertically inserted into the first screw rod 34 .

[0065] The end of the piston rod M1 of some hydraulic cylinders M1 is sometimes pre-installed with a connector and other components, making it impossible for the spool 50 to be directly inserted into the piston rod M1 from the end of the piston rod M1. Therefore, in this embodiment, based on this type of hydraulic cylinder M1, the spool 50 is further improved. Specifically:

[0066] like Figure 4 and Figure 5 As shown, the spool 50 includes two half-wheel bodies 51 , one end of the two half-wheel bodies 51 is hinged by a hinge 512 , and the other end is locked by a locking member 52 . At this time, the spool 50 is equivalent to being formed by the two half-wheel bodies 51 .

[0067] like Figure 4 As shown, the locking member 52 includes a second screw 521, a first nut 523, and a tensioning plate 522 with a U-shaped bayonet; the tensioning plate 522 and the second screw 521, one of which is hinged to one of the half-wheel bodies 51, and the other is fixed to the other half-wheel body 51; the second screw 521 is embedded in the U-shaped bayonet of the tensioning plate 522 and is locked by the first nut 523.

[0068] During installation, first loosen the second screw 521, open the two half-wheel bodies 51, and directly clamp them from the rod part of the piston rod M1 to the rod body of the piston rod M1, then rotate the two half-wheel bodies 51 to close the two half-wheel bodies 51, then rotate the second screw 521 so that the second screw 521 is clamped into the clamping socket of the tensioning plate 522, and then screw on the first nut 523, so that the first nut 523 continues to approach the tensioning plate 522 until the first nut 523 is tightened on the tensioning plate 522. At this time, the two half-wheel bodies 51 are tightly clamped on the piston rod M1.

[0069] In some embodiments, a rubber pad 511 is provided on the inner circumferential wall of the half-wheel body 51. When the I-wheel 50 is locked, the two half-wheel bodies 51 are clamped on the piston rod M1 through the rubber pad 511, making it difficult to slide. Moreover, the presence of the rubber pad 511 can prevent the half-wheel body 51 from directly contacting the piston rod M1, thereby reducing damage to the piston rod M1 during the clamping process.

[0070] In order to enable the vertical rod 31 to enter / exit the wheel groove of the I-shaped wheel 50, in some embodiments, such as Figure 3 As shown, the connecting assembly 3 also includes a sleeve 36 and a cross bar 35 that can be axially extended and retracted relative to each other, that is, the cross bar 35 is movably arranged in the sleeve 36 and can be extended and retracted relative to the sleeve 36 in a direction horizontally perpendicular to the first direction.

[0071] One end of the sleeve 36 is slidably connected to the slide rail 2. Specifically, a slider 21 is slidably provided on the slide rail 2, and the sleeve 36 is fixed to the slider 21. The crossbar 35 is fixed to the vertical bar 31, and the two form an L-shaped structure.

[0072] A locking member is provided between the sleeve 36 and the cross bar 35 for locking the two. The specific structure of the locking member can be:

[0073] like Figure 3As shown, the locking member includes a third screw 351 and a second nut 352. A through slot 361 is provided on the sleeve 36 along the length direction of the sleeve 36. The lower end of the third screw 351 passes through the through slot 361 and is fixed to the cross bar 35. The second nut 352 is threadedly connected to the third screw 351. When the second nut 352 is loosened, the cross bar 35 can be extended and retracted relative to the sleeve 36. Conversely, when the second nut 352 is tightened, the second nut 352 will be pressed against the upper wall of the sleeve 36, so that the cross bar 35 is locked relative to the sleeve 36 and cannot be extended or retracted.

[0074] Example 2

[0075] This embodiment provides a method for detecting a hydraulic cylinder M1 based on the first embodiment. The method is performed using the detection device provided in the first embodiment and specifically includes the following steps:

[0076] S1. First, install the two spools 50 onto the two piston rods M1 respectively;

[0077] S2. Operate the two connecting components 3 separately according to the following steps: move the cross bar 35 so that the vertical bar 31 drives the roller 32 to enter the wheel groove of the I-shaped wheel 50, and then tighten the second nut 352 to fix the position of the cross bar 35; then rotate the first screw 34 to move the first screw 34 downward to push the movable shaft 33 and the roller 32 on the movable shaft 33 against the inner side wall of the wheel plate of the I-shaped wheel 50.

[0078] S3. Turn on the distance measuring device 41, and then drive the two hydraulic cylinders M1 at the same time with the same driving oil pressure; during the detection process, when the warning device issues a warning message, stop the hydraulic cylinder M1 from moving, and the surface detection result is unqualified; if the warning device does not issue a warning message during the completion of the extension and retraction action of the hydraulic cylinder M1, the surface detection result is qualified.

[0079] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in this application can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solutions disclosed in this application can be achieved. This is not a limitation herein.

[0080] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0081] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A hydraulic cylinder detection device for detecting the telescopic synchronization of two hydraulic cylinders, characterized in that: include: A testing platform, for placing two hydraulic cylinders along a first direction; Two slide rails, the two slide rails are parallel to each other and extend along a first direction; Two connecting assemblies, the two connecting assemblies are respectively attached to the two hydraulic cylinders, wherein the hydraulic cylinders and the connecting assemblies attached thereto are relatively positioned along a first direction, and the two connecting assemblies are respectively slidably arranged on the two slide rails along the first direction; A distance measuring assembly includes a distance measuring device and a reference member; the distance measuring device and the reference member are respectively connected to two connecting assemblies, wherein the distance measuring device and the reference member are spaced apart from each other in at least a first direction; the distance measuring device is used to detect in real time the distance between the distance measuring device and the reference member in the first direction; The connecting assembly is attached to the piston rod of the hydraulic cylinder through an attachment assembly; the attachment assembly includes an I-shaped wheel sleeved on the piston rod, and the connecting assembly includes a vertical rod, with rollers provided on both sides of the vertical rod, and the two rollers respectively abut against the inner side walls of the wheel plates on both sides of the I-shaped wheel; At least one of the two rollers is movable along a first direction to form a movable roller; the vertical rod is further provided with a driving component for driving the movable roller to move along the first direction; The driving assembly includes a first screw and a movable shaft, and the vertically extending channel is further provided in the vertical rod; the first screw is threadedly connected to the end of the vertical rod, and the outer peripheral wall of the lower end of the first screw is a conical surface that gradually narrows downward; the movable shaft is movably provided on the vertical rod along a first direction, one end of which is connected to the movable roller, and the other end is abutted against the conical surface; A vertically extending guide rod is also fixedly connected in the channel, and the guide rod is movably arranged on the first screw rod in the vertical direction.

2. A hydraulic cylinder detection device according to claim 1, characterized in that: The device also includes a controller and a warning device. The controller is configured so that when D≥S, the warning device sends a warning signal; where S is a preset value, D=|D2-D1|, where D1 is the distance between the distance measuring device in the first direction in the initial state; and D2 is the real-time distance between the reference part and the distance measuring device in the first direction measured by the distance measuring device during the detection process.

3. A hydraulic cylinder detection device according to claim 1, characterized in that: The I-shaped wheel comprises two half wheel bodies, one end of the two half wheel bodies is hinged to each other, and the other end is locked by a locking piece.

4. A hydraulic cylinder detection device according to claim 3, characterized in that: The locking member includes a second screw, a first nut, and a tensioning plate with a U-shaped bayonet; one of the tensioning plate and the second screw is hinged to one of the half-wheel bodies, and the other is fixed to the other half-wheel body; the second screw is embedded in the U-shaped bayonet of the tensioning plate and is locked by the first nut.

5. The hydraulic cylinder detection device according to claim 1, characterized in that: The connecting assembly also includes a sleeve and a cross bar that can be relatively axially extended and retracted. One end of the sleeve is slidably connected to the slide rail, and the cross bar is fixed to the vertical pole. A locking member for locking the sleeve and the cross bar is provided between the sleeve and the cross bar.

6. A method for detecting a hydraulic cylinder, characterized in that: The method is carried out using the detection device according to any one of claims 1 to 5.

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