A lifting safety protection device, a tilting and swinging test system and a safety linkage implementation method

Abstract

This invention discloses a lifting safety protection device, a tilting and swaying test system, and a safety linkage implementation method. The lifting safety protection device includes a support frame and a standing surface; the standing surface is positioned directly above the support frame; a hydraulic cylinder is installed at each of the four corners of the support frame; the piston rods at the top of the four hydraulic cylinders are connected to the four corners of the bottom of the standing surface; the standing surface has an opening for accommodating the tilting and swaying test platform; a guardrail is installed around the top of the standing surface; a ladder is installed behind the standing surface; a first guide linear bearing is installed next to each hydraulic cylinder on the support frame; a guide shaft is installed inside each first guide linear bearing; the top of the guide shaft is connected to the bottom of the standing surface. This invention allows for convenient and controllable adjustment of the height of the standing surface, enabling stable vertical lifting and lowering, achieving flush alignment between the standing surface and the tilting and swaying test platform, allowing operators to safely access the test platform.

Description

Technical Field

[0001] This invention relates to the field of mechanical engineering technology, and in particular to a lifting safety protection device, a tilting and swinging test system, and a safety linkage implementation method. Background Technology

[0002] A tilting and swaying test bench is a specialized testing device used to simulate the motion of objects under tilted, swaying, or shaking conditions to test their stability, reliability, safety, or performance. It is widely used in aerospace, shipbuilding, automotive, mechanical engineering, and electronic equipment industries to simulate complex dynamic environments such as earthquakes, ocean waves, vehicle bumps, and aircraft attitude changes.

[0003] Existing tilting and swing test benches typically lack dedicated safety devices. Operators must climb directly onto the test bench to install test pieces. Since the test bench is usually quite high (generally over 1.6 meters), operators face a high risk of falling, posing a safety hazard.

[0004] Therefore, there is an urgent need to develop a technology that can solve the above-mentioned technical problems. Summary of the Invention

[0005] The purpose of this invention is to address the technical deficiencies of existing technologies by providing a lifting safety protection device, a tilting and swinging test system, and a safety linkage implementation method.

[0006] Therefore, the present invention provides a lifting safety protection device, including a support frame, a standing surface, a ladder, a guardrail, a hydraulic cylinder, and a guide shaft;

[0007] The standing surfaces are spaced directly above the support frame;

[0008] A vertically distributed hydraulic cylinder is installed at each of the four corners of the support frame;

[0009] The piston rods at the top of the four hydraulic cylinders are respectively connected to the four bottom corners of the standing surface;

[0010] The standing surface is provided with vertically distributed inclined swing test platform accommodating openings;

[0011] The tilting swing test bench is provided inside the opening of the accommodating opening;

[0012] A railing surrounds the top of the standing surface;

[0013] A ladder is provided at the rear of the standing area;

[0014] The support frame is equipped with a vertically distributed first guide linear bearing next to each hydraulic cylinder;

[0015] A guiding shaft is vertically penetrated through the vertical central through hole of each first guiding linear bearing.

[0016] The top of the guiding shaft is connected to the bottom of the standing surface.

[0017] As can be seen from the technical solution provided by the present invention above, compared with the prior art, the present invention provides a lifting safety protection device, an inclined swing test system and a safety linkage implementation method, with scientific design. The lifting safety protection device can conveniently and controllably adjust the height of the standing surface, enabling the standing surface to stably lift in the vertical direction, achieving that the standing surface is flush with the table surface of the inclined swing test bench, and allowing the operator to safely go to the table surface of the test bench to install the test piece, which has great practical significance.

[0018] In addition, for the lifting safety protection device provided by the present invention, its height can be adjusted to be flush with the table surface of the inclined swing test bench, reducing the operation climbing risk of the operator, and having strong stability. The standing surface will not be skewed, and at the same time, the standing surface will not deviate during the vertical lifting operation.

[0019] Through inspection, the lifting safety protection device provided by the present invention is a protection device driven by hydraulic pressure, with synchronous adjustment of guiding shafts and safety control, and is a protection device with synchronous lifting, emergency stop locking, height adaptation and safety passage, which can effectively prevent the danger of personnel falling during the operation of the inclined swing test bench. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of a lifting safety protection device provided by the present invention;

[0021] Figure 2 As shown in Figure 1 It is a partially enlarged schematic diagram of a lifting safety protection device provided by the present invention as shown; Figure 1 ;

[0022] Figure 3 As shown in [[ID=3,2]] Figure 1 It is a partially enlarged schematic diagram of a lifting safety protection device provided by the present invention as shown; Figure 2 [[ID=,35]];

[0023] Figure 4 It is a working principle diagram of the hydraulic system supporting the lifting safety protection device provided by the present invention, which shows the connection relationship between the oil pump, oil pipe and hydraulic cylinder;

[0024] Figure 5 It is a overall working flow chart of the safety linkage implementation method (i.e., safety linkage mechanism) of a lifting safety protection device provided by the present invention;

[0025] In the diagram, 1-support frame, 2-standing surface, 3-ladder, 4-guardrail, 5-hydraulic cylinder;

[0026] 6-Guide shaft, 7-Remote control, 8-Tilting swing test table, 9-Oil pump. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0029] In the description of this patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this patent according to the specific circumstances.

[0030] 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 indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0031] See Figures 1 to 5 The present invention provides a lifting safety protection device, including a support frame 1, a standing surface 2, a ladder 3, a guardrail 4, a hydraulic cylinder 5, and a guide shaft 6;

[0032] The standing surface 2 is spaced out directly above the support frame 1;

[0033] A vertically distributed hydraulic cylinder 5 is installed at each of the four corners of the support frame 1;

[0034] The piston rods at the top of the four hydraulic cylinders 5 are respectively connected to the four bottom corners of the standing surface 2;

[0035] The standing surface 2 is provided with vertically distributed inclined swing test table accommodating openings;

[0036] An inclined swing test bench 8 is provided inside the opening of the inclined swing test bench;

[0037] A guardrail 4 is installed around the top of the standing surface 2;

[0038] A ladder 3 is provided behind the standing side 2;

[0039] The support frame 1 is provided with a vertically distributed first guide linear bearing 101 next to each hydraulic cylinder 5;

[0040] A guide shaft 6 is vertically inserted through the vertical center through hole of each first guide linear bearing 101;

[0041] The top of the guide shaft 6 is connected to the bottom of the standing surface 2.

[0042] In this invention, specifically, the opening of the tilting swing test bench and the tilting swing test bench 8 are in clearance fit.

[0043] In this invention, specifically, the vertical center through hole of the first guide linear bearing 101 and the guide shaft 6 are in clearance fit.

[0044] In this invention, specifically, the support frame 1 is also provided with a second guide linear bearing 102 directly above each hydraulic cylinder 5;

[0045] The piston rod at the top of the hydraulic cylinder 5 passes vertically through the vertical central through hole of the second guide linear bearing 102;

[0046] In practice, the piston rod at the top of the hydraulic cylinder 5 and the vertical center through hole of the second guide linear bearing 102 are in clearance fit.

[0047] In this invention, specifically, the ladder 3 is not fixedly connected to the standing surface 2, and it has multiple steps of different heights distributed from top to bottom.

[0048] In this invention, specifically, the rear end of the guardrail 4 is provided with an openable guardrail door 40;

[0049] It should be noted that the guardrail gate 40 is hinged to the rest of the rear side of the guardrail 4 (i.e., rotatably connected).

[0050] In terms of specific implementation, the guardrail 4 on the outer sides around the top of the standing surface 2 is specifically a guardrail 4 with a height of 1 m, and there is an openable guardrail door 40 (specifically a guardrail door with an electric control lock) on it for operation.

[0051] It should be noted that the guardrail door provided on the guardrail 4 can specifically be a conventional electromagnetic lock guardrail door (that is, a guardrail door with an electric control lock) that is mature in the prior art and can be unlocked when the standing surface 2 rises to the maximum height.

[0052] In the present invention, in terms of specific implementation, the liquid inlet ports of the four hydraulic cylinders 5 are respectively connected to the liquid outlet port of an oil pump 9 through hollow oil pipes.

[0053] The liquid outlet ports of the four hydraulic cylinders 5 are respectively connected to the liquid inlet port of the oil pump 9 through hollow oil pipes.

[0054] In the present invention, in terms of specific implementation, the signal control end of the oil pump 9 is connected to the signal sending end of the remote controller 7 (wireless connection or wired connection).

[0055] The remote controller 7 is used to send control signals (such as an upward movement control signal, a downward movement control signal, and an emergency stop control signal) to the controller of the oil pump 9, and control the working state of the four hydraulic cylinders 5 through the oil pump 9, that is, control the four hydraulic cylinders 5 to perform corresponding operations (such as an upward movement operation, a downward movement operation, and an emergency stop operation).

[0056] In terms of specific implementation, the remote controller 7 is arranged in the middle of the front end of the support frame 1.

[0057] In the present invention, in terms of specific implementation, the support frame 1 is welded into a "square" - shaped frame using 40 mm × 40 mm square steel pipes, with an outer size of 3.7 m × 3.7 m, an inner size of 2 m × 2 m, and a height of 1.1 m.

[0058] In the present invention, in terms of specific implementation, the standing surface 2 is specifically a "square" - shaped platform with the same size as the support frame, and its four corners are driven by hydraulic cylinders to lift, and the maximum rising height can be 2 m.

[0059] In the present invention, in terms of specific implementation, the hydraulic system (which is a hydraulic synchronization system) of the present invention includes four hydraulic cylinders 5 and an oil pump 9; among them, the four hydraulic cylinders 5 are connected to the oil pump 9 through oil pipes, and the telescopic movement of the piston rods of the hydraulic cylinders 5 is controlled by oil inlet and oil return, and can be controlled by the remote controller 7 (including upward, downward, and emergency stop buttons). <​​​In this invention, specifically, a guide shaft 6 is provided at each of the four corners of the support frame 1 to ensure that the standing surface 2 does not shift during vertical lifting.

[0062] In this invention, specifically, the climbing ladder 3 is a climbing ladder of fixed height, with its inner side close to the outer side of the support frame 1.

[0063] It should be noted that, in this invention, the hydraulic synchronization system, combined with the guide shaft 6, prevents the platform (i.e., the standing surface 2) from tilting. Simultaneously, this invention adds a remote control emergency stop function by including a remote control 7, and a guardrail 4 that is linked to the standing surface 2, thus preventing misoperation and falls from height.

[0064] In this invention, specifically, at least one displacement sensor (i.e., a limit switch, also called a limit position sensor) is provided on the top of the support frame 1.

[0065] The displacement sensor is used to detect the vertical displacement of the standing surface 2 (i.e., the change in distance between the bottom of the standing surface 2 and the top of the support frame 1). When the piston rod of the hydraulic cylinder 5 extends upward continuously, causing the vertical displacement to reach the preset upper limit threshold, an emergency stop locking signal (i.e., limit signal) is output to the remote controller 7 to realize the emergency stop automatic locking of the remote controller 7. The remote controller 7 then sends a control signal to the controller of the oil pump 9 to control the oil pump to cut off the power and lock the oil return circuit, so that the hydraulic cylinder 5 stops moving upward. It also outputs an access control unlocking permission signal to the electric lock on the guardrail gate 40 of the guardrail 4 to unlock the guardrail gate 40, so that the guardrail gate 40 is in an openable state.

[0066] When the vertical displacement of the standing surface 2 reaches (i.e. equals) the preset upper limit threshold, the top surface of the tilting swing test table 8 is at the same height as the standing surface 2, that is, the two are level.

[0067] It should be noted that the height of the standing surface 2 is equal to the distance between the bottom of the standing surface 2 and the top of the support frame 1 plus the height of the top of the support frame 1, that is, the sum of the two.

[0068] It should be noted that the guardrail gate 40 is a movable guardrail gate. It is based on the displacement sensor triggering logic. When the vertical displacement of the standing surface 2 reaches the preset upper limit threshold, the displacement sensor outputs the access control unlocking permission signal to the electric lock on the guardrail gate 40.

[0069] To better understand the technical solution of the present invention, the working principle of the present invention will be explained below with reference to specific embodiments.

[0070] The lifting and lowering control process of the standing surface of the present invention is described in detail below:

[0071] 1. Initial state: The standing surface 2 is in contact with the support frame 1 (1.1m), and the hydraulic cylinder 5 is not extended. The operator presses the "up" button on the remote control 7, and the oil pump 9 supplies oil to drive the piston rod of the hydraulic cylinder 5 to extend, while the guide shaft 6 restricts the offset.

[0072] 2. Maximum limit: When the standing surface 2 rises to a height of 2m (at this time, the vertical displacement of the standing surface 2 reaches the preset upper limit threshold), the hydraulic cylinder 5 triggers the displacement sensor to output an emergency stop locking signal (i.e., limit signal) to the remote controller 7, realizing an emergency stop and automatic locking of the remote controller 7. The operator enters the standing surface 2 by climbing the ladder (e.g., the seventh step) and opening the guardrail door 40 on the guardrail 4.

[0073] III. Reset Procedure: After the installation of the test piece on the tilting swing test table inside the standing surface 2 is completed, the operator returns to the ground and presses the "down button" on the remote control 7. The oil pump 9 supplies oil to drive the piston rod of the hydraulic cylinder 5 to shorten, while the guide shaft 6 restricts the offset until the bottom of the standing surface 2 is re-fitted with the support frame 1, and the emergency stop is locked.

[0074] In this invention, specifically, when the emergency stop button on the remote control 7 is triggered, it further sends a control signal to the controller of the oil pump 9 to control the oil pump to cut off power and lock the oil return circuit. At this time, because the emergency stop mechanism has been activated, a physical reset is required to restore normal operation.

[0075] Based on the lifting safety protection device provided by the present invention, the present invention also provides a tilting and swaying test system, which includes the lifting safety protection device as described above, and a tilting and swaying test platform 8.

[0076] The tilting swing test bench 8 is located inside the tilting swing test bench accommodating opening of the lifting safety protection device.

[0077] Based on the lifting safety protection device provided by the present invention, see [link / reference] Figure 5 The present invention also provides a safety linkage implementation method (i.e., safety linkage mechanism) for a lifting safety protection device, which includes the following steps:

[0078] Step S1: The vertical displacement of the standing surface 2 (i.e., the change in distance between the bottom of the standing surface 2 and the top of the support frame 1) is detected in real time by a displacement sensor (i.e., a limit switch, also called an extreme position sensor). When the vertical displacement reaches a preset upper limit threshold, the displacement sensor outputs an access control unlocking permission signal to the electric lock on the guardrail gate 40 of the guardrail 4. The electric lock is used to unlock the guardrail gate 40, so that the gate of the guardrail gate 40 is opened.

[0079] Step S2: After the door body of the guardrail door 40 is opened, the electric control lock on the guardrail door 40 sends a trigger working signal to the linkage control module. The linkage control module generates a descent instruction shielding signal and sends it to the remote controller 7 to forcibly block the descent instruction transmission link on the remote controller 7, and issues a control signal for unlocking the pressure relief circuit of the hydraulic cylinder to the controller of the oil pump 9, so as to lock the pressure relief circuits of the four hydraulic cylinders 5 connected to the oil pump 9 and prevent the sudden pressure relief of the hydraulic cylinders 5.

[0080] Step S3: When the door body of the guardrail door 40 is closed (for example, when the test is completed and the operator leaves and closes it manually), the electric control lock on the guardrail door 40 is triggered to generate a closed-in-place signal and send it to the linkage control module. The linkage control module generates a解除指令屏蔽信号 (unlock instruction shielding signal) and sends it to the remote controller 7 to restore the descent instruction transmission link on the remote controller 7, and issues a control signal for releasing the pressure relief circuit lock to the controller of the pump 9 to release the pressure relief circuits of the hydraulic cylinders 5, that is,解除液压缸5的液压回路闭锁 (unlock the hydraulic circuit of the hydraulic cylinder 5).

[0081] In the present invention, specifically, the linkage control module can be a programmable logic controller PLC, a central processing unit CPU, a digital signal processor DSP or a microcontroller MCU.

[0082] Compared with the prior art, the lifting safety protection device provided by the present invention has the following beneficial effects:

[0083] 1. The present invention adopts a "square frame" double-layer frame synchronous lifting structure: The support frame 1 of the present invention forms a nested structure with the standing surface 2. Through the cooperation of the hydraulic cylinders at the four corners and the guide shafts, the lifting synchronism is ensured, and the overall anti-rollover ability is improved.

[0084] 2. The present invention adopts a four-corner guide shaft and hydraulic cylinder linkage anti-offset system: The guide shaft bears the lateral force, and the hydraulic cylinder only needs to output vertical driving force, avoiding the bending moment load on the piston rod of the hydraulic cylinder and improving the service life of the hydraulic system.

[0085] 3. The present invention also innovatively designs a height linkage safety mechanism between the climbing ladder and the standing surface (that is, the safety linkage implementation method of the lifting safety protection device). By providing a guardrail door with an electromagnetic lock (that is, an electric control lock) at the top of the climbing ladder, the on-off state of the door lock is bound to the signal of the lifting position of the standing surface. Only when the standing surface rises to the highest limit position and is flush with the top of the climbing ladder, the electromagnetic lock is powered off and released, and only then will the door body of the guardrail door 40 be opened, reducing the risk of the operator falling from a height.

[0086] In summary, compared with the prior art, the present invention provides a lifting safety protection device, a tilting swing test bench, and a safety linkage implementation method. The design is scientific. The lifting safety protection device can conveniently and controllably adjust the height of the standing surface, so that the standing surface can be stably raised and lowered in the vertical direction, making the standing surface flush with the platform of the tilting swing test bench. This allows operators to safely access the platform of the test bench to install test pieces, which has significant practical value.

[0087] Furthermore, the height of the lifting safety protection device provided by this invention can be adjusted to be flush with the platform of the tilting swing test table, reducing the risk of operators climbing, and it has strong stability, so the standing surface will not be tilted, and the standing surface will not shift when performing vertical lifting operations.

[0088] Through testing, the lifting safety protection device provided by this invention is a protective device that is hydraulically driven, synchronously adjusted by the guide shaft, and has safety control. It is a protective device with synchronous lifting of the entire standing surface (i.e., the four corner positions), emergency stop locking, height adaptation, and a safety passage, which can effectively prevent the danger of personnel falling when operating on the tilting and swinging test table.

[0089] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A lift-type safety shield characterized by, Includes support frame (1), standing surface (2), ladder (3), guardrail (4), hydraulic cylinder (5) and guide shaft (6); The standing surfaces (2) are spaced apart directly above the support frame (1); A vertically distributed hydraulic cylinder (5) is provided at each of the four corners of the support frame (1); The piston rods at the top of the four hydraulic cylinders (5) are respectively connected to the four corners of the bottom of the standing surface (2); An inclined swing test table with vertically distributed openings is provided on the standing surface (2); An inclined swing test platform (8) is provided inside the opening of the inclined swing test platform. A railing (4) is provided around the top of the standing surface (2); A ladder (3) is provided behind the standing side (2); The support frame (1) is provided with a vertically distributed first guide linear bearing (101) next to each hydraulic cylinder (5); A guide shaft (6) is vertically inserted through the vertical center through hole of each first guide linear bearing (101). The top of the guide shaft (6) is connected to the bottom of the standing surface (2); The rear end of the guardrail (4) is provided with an openable guardrail gate (40), which is a guardrail gate with an electric lock; At least one displacement sensor is provided on the top of the support frame (1); The displacement sensor is used to detect the vertical displacement of the standing surface (2). When the piston rod of the hydraulic cylinder (5) extends upward continuously, and the vertical displacement reaches the preset upper limit threshold, an emergency stop lock signal is output to the remote controller (7) to realize the emergency stop automatic lock of the remote controller (7), and the remote controller (7) sends a control signal to the controller of the oil pump (9) to control the oil pump to cut off the power and lock the oil circuit return oil, so that the hydraulic cylinder (5) stops moving upward, and outputs the access control unlock permission signal to the electric lock on the guardrail gate (40) of the guardrail (4) to control the unlocking of the guardrail gate (40), so that the guardrail gate (40) is in an openable state; When the vertical displacement of the standing surface (2) reaches the preset upper limit threshold, the top surface of the tilting swing test table (8) is at the same height as the standing surface (2).

2. The overhead safety guard of claim 1 wherein, The opening of the tilting swing test bench is clearance-fitted with the tilting swing test bench (8); The vertical center through hole of the first guide linear bearing (101) is clearance-fitted with the guide shaft (6).

3. The overhead safety guard of claim 1 wherein, The support frame (1) is also provided with a second guide linear bearing (102) directly above each hydraulic cylinder (5). The piston rod at the top of the hydraulic cylinder (5) passes vertically through the vertical center hole of the second guide linear bearing (102).

4. The overhead safety guard of claim 3 wherein, The piston rod at the top of the hydraulic cylinder (5) is clearance-fitted with the vertical center through hole of the second guide linear bearing (102).

5. The overhead safety guard of claim 1 wherein, The inlets of the four hydraulic cylinders (5) are connected to the outlet of an oil pump (9) through hollow oil pipes. The outlets of the four hydraulic cylinders (5) are connected to the inlet of the oil pump (9) through hollow oil pipes.

6. The overhead safety guard of claim 5 wherein, The signal control terminal of the oil pump (9) is connected to the signal transmitting terminal of the remote controller (7); The remote controller (7) is used to send control signals to the controller of the oil pump (9) and control the working status of the four hydraulic cylinders (5) through the oil pump (9).

7. A tilt and roll test system characterized by, Includes the lifting safety protection device as described in any one of claims 1 to 6; The tilting swing test bench (8) is located inside the opening of the tilting swing test bench of the lifting safety protection device.

8. A method of implementing the safety linkage of a lifting guard as claimed in any one of claims 1 to 6, characterised by, Includes the following steps: Step S1: The vertical displacement of the standing surface (2) is detected in real time by the displacement sensor. When the vertical displacement reaches the preset upper limit threshold, the displacement sensor outputs the access control unlocking permission signal to the electric lock on the guardrail door (40) of the guardrail (4). The electric lock is used to control the unlocking of the guardrail door (40), so that the guardrail door (40) opens. Step S2: When the gate of the guardrail (40) is opened, the electric lock on the guardrail (40) sends a trigger working signal to the linkage control module. The linkage control module generates a descent command shielding signal and sends it to the remote controller (7), forcibly blocking the descent command transmission link on the remote controller (7), and sending a lock hydraulic cylinder pressure relief circuit control signal to the controller of the oil pump (9), thereby locking the pressure relief circuit of the four hydraulic cylinders (5) connected to the oil pump (9) to prevent the hydraulic cylinders (5) from suddenly depressurizing. Step S3: When the gate of the guardrail (40) is closed, the electric lock on the guardrail (40) triggers to generate a closed position signal and sends it to the linkage control module. The linkage control module generates a release command shielding signal and sends it to the remote controller (7), restores the descent command transmission link on the remote controller (7), and sends a release pressure relief circuit lockout control signal to the controller of the oil pump (9) to release the pressure relief circuit of the hydraulic cylinder (5), that is, to release the hydraulic circuit lockout of the hydraulic cylinder (5).

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