A kind of hydraulic cylinder body sealing detection device of logging forestry machinery

Abstract

The application discloses a kind of forestry machinery hydraulic oil cylinder body sealing detection device, it is related to sealing detection technical field, including base, sliding seat, cylinder positioning unit, vertical plate, fixed plate, extrusion unit, rotating sleeve, connecting column, connecting column circumference and rotating sleeve inner hole are key connection, outer thread portion is coaxially arranged in the lower end of connecting column, and communicating hole is opened in the top of connecting column coaxially and passes through the lower end surface of outer thread portion;Pressure detection unit is installed in the top of fixed plate;Lowering unit is arranged in the bottom of fixed plate, and lowering unit is used to drive outer thread portion to move downward when connecting column rotates.The application in this paper does not need to wait for a long time when the next detection is carried out, in addition, by connecting column moves downward, then by connecting column rotation, so that the outer thread portion on connecting column can be screwed in the pipe joint of hydraulic oil cylinder, and then the pipe joint of hydraulic oil cylinder does not need to be connected by manual mode.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sealing detection, in particular to a kind of forestry machinery hydraulic cylinder body sealing detection device of felling. BACKGROUND

[0002] The actuator on forestry machinery equipment usually needs high-pressure large-flow hydraulic element (such as hydraulic cylinder) to drive, the sealing performance of the inner wall of the cylinder body of the hydraulic cylinder and the piston directly determines the load capacity of the actuator, that is, when the gap between the cylinder body inner wall and the piston is generated, the pressure of the two cavities separated by the cylinder body by the piston is unstable when the hydraulic cylinder is in action, which will lead to unstable action of the actuator of forestry machinery equipment and reduced load capacity, so it is necessary to detect the sealing performance of the cylinder body and the piston when the hydraulic cylinder is shipped.

[0003] Through searching, a kind of sealing detection device of hydraulic cylinder processing finished product is disclosed in Chinese patent publication No.CN213091087U, which is to observe whether there is bubble by introducing compressed gas into the cylinder body of hydraulic cylinder, then immersing the hydraulic cylinder in liquid, to determine the sealing performance of the hydraulic cylinder by observing whether there is bubble.

[0004] In the above prior art, when introducing compressed gas into the cylinder body of hydraulic cylinder, it is often to connect the pipe interface of hydraulic cylinder with air pipe, so that compressed gas enters the cylinder body, since air pipe needs to be installed manually, the detection efficiency is low, and the way of determining sealing performance by observing whether there is bubble, if batch product detection is needed, the next detection must be carried out after the water surface is calm, because if the water surface fluctuates, it is impossible to accurately determine whether there is bubble, which leads to the decline of detection accuracy. SUMMARY

[0005] The purpose of the present application is to provide a kind of forestry machinery hydraulic cylinder body sealing detection device of felling, to solve the problems raised in the above background.

[0006] To achieve the above purpose, the present application provides the following technical scheme:

[0007] A kind of forestry machinery hydraulic cylinder body sealing detection device of felling, comprising:

[0008] Base and horizontally slidingly connected to the top of the base sliding seat;

[0009] Cylinder positioning unit provided on the sliding seat;

[0010] Two vertical plates connected to the top of the base and the fixed plate fixed to the top of the two vertical plates;

[0011] An extrusion unit is installed on one of the vertical plates;

[0012] A rotating sleeve is vertically rotatably connected to the fixed plate;

[0013] A connecting column is coaxially and slidingly arranged in the rotating sleeve, the periphery of the connecting column is in key connection with the inner hole of the rotating sleeve, the lower end of the connecting column is coaxially provided with an external thread part, and the top of the connecting column is coaxially provided with a communication hole penetrating the lower end surface of the external thread part;

[0014] A pressure detection unit is installed on the top of the fixed plate;

[0015] A downward moving unit is arranged at the bottom of the fixed plate, and the downward moving unit is used to drive the external thread part to move downward when the connecting column rotates.

[0016] According to the above technical scheme, the extrusion unit generates extrusion force on the end of the piston rod of the hydraulic cylinder placed on the top of the sliding seat, so that the piston rod moves and the piston of the hydraulic cylinder extrudes the air in the cylinder body, so that the air in the cylinder body is extruded into a compressed state, and after the piston rod is extruded to the position, the pressure is maintained for a period of time, and then the pressure in the cylinder body is detected by the pressure detection unit, so that the leakage of the cylinder body and the piston can be quickly detected, and when the next detection is performed, there is no need to wait for a long time, and the external thread part on the connecting column can be screwed into the pipe interface of the hydraulic cylinder by rotating the connecting column, so that the pipe interface of the hydraulic cylinder is connected without manual connection.

[0017] Further, a translation air cylinder is horizontally installed on the top of the machine base, and the cylinder rod of the translation air cylinder is drivingly connected with the sliding seat.

[0018] According to the above technical scheme, the sliding seat is driven by the translation air cylinder to move horizontally on the machine base, and then the hydraulic cylinder placed on the top of the sliding seat is transported to the lower side of the connecting column.

[0019] Further, the cylinder body positioning unit comprises a fixed block connected to the top of the sliding seat, and a clamping groove in the form of a gap is formed in one side outer wall of the fixed block.

[0020] According to the above technical scheme, the tail end of the hydraulic cylinder is clamped into the clamping groove of the fixed block, so that the hydraulic cylinder can be pre-positioned.

[0021] Further, a servo motor is vertically installed at the bottom of the fixed plate, and the motor shaft of the servo motor is drivingly connected with the rotating sleeve through a transmission member.

[0022] According to the above technical scheme, the motor shaft of the servo motor is rotated, and the rotating sleeve is driven to rotate through the transmission member.

[0023] Further, the pressure detection unit comprises a rotary joint rotatably connected to the top of the connecting column, a hollow seat connected to the top of the fixed plate, the hollow seat is connected with the rotary joint through a hose, and an air pressure gauge is installed on the top of the hollow seat.

[0024] Through the above technical scheme, the air in the hydraulic cylinder enters the rotary joint through the communication hole, then enters the hose through the rotary joint, and then enters the air pressure gauge through the hollow seat cavity. The air pressure gauge will indicate the air pressure in the hydraulic cylinder.

[0025] Further, the downward moving unit comprises a fixed ring coaxially and fixedly sleeved around the periphery of the connecting column, an arc-shaped protruding portion is fixedly connected to the upper end face of the fixed ring, a flange ring is connected to the bottom of the fixed plate, a mounting arm is vertically and fixedly connected to the lower end face of the flange ring, a roller is rotatably connected to the lower end of the mounting arm, the roller rolls on the upper end face of the fixed ring, and an elastic reset unit is arranged on the fixed plate. The elastic reset structure gives the connecting column potential energy for upward movement.

[0026] Through the above technical scheme, when the connecting column rotates, the roller will roll on the upper end face of the fixed ring. When the roller rolls from the upper end face of the fixed ring to the surface of the arc-shaped protruding portion, a downward extrusion force will be generated on the fixed ring, which drives the connecting column to move downward, so that the external thread portion of the connecting column quickly moves downward into the pipe interface of the hydraulic cylinder. With the rotation of the connecting column, the external thread portion on the connecting column is screwed with the internal thread in the pipe interface of the hydraulic cylinder. In this way, the pipe interface does not need to be connected manually, and the structure is simple.

[0027] Further, the arc-shaped protruding portion is made of rubber material.

[0028] Through the above technical scheme, the arc-shaped protruding portion has a certain elastic deformation, which facilitates the screwing of the external thread portion and the internal thread of the pipe interface.

[0029] Further, the elastic reset structure comprises a lifting ring rotatably sleeved around the periphery of the fixed ring, guide rods are vertically and fixedly arranged on both sides of the lifting ring, the upper ends of the guide rods slide out of the fixed plate and are fixedly sleeved with limit nuts, and elastic members are arranged between the limit nuts and the fixed plate.

[0030] Through the above technical scheme, the limit nut is subjected to an upward elastic abutting force by the elastic member, so that when the lifting ring moves downward, the elastic member can accumulate elastic potential energy. When the connecting column is reversely rotated and the external thread portion is separated from the threaded screwing state of the internal thread of the pipe interface, the connecting column can quickly move upward.

[0031] Further, the extrusion unit comprises an extrusion cylinder horizontally mounted on the outer wall of the vertical plate, and an extrusion part is drivingly connected to the extrusion cylinder, and the end of the extrusion part is provided with an anti-retraction structure.

[0032] Through the above technical scheme, the extrusion part is driven by the extrusion cylinder to move towards the sliding seat, so that the extrusion part can extrude the end of the piston rod of the hydraulic cylinder, and the anti-retraction structure can prevent the piston rod of the hydraulic cylinder from retracting after the extrusion part moves to the position, that is, a gap is generated between the end face of the piston rod and the end face of the extrusion part.

[0033] Further, the anti-retraction structure comprises a deformation part integrally connected to the end of the extrusion part away from the extrusion cylinder, the outer diameter of the deformation part gradually decreases away from the extrusion part, the deformation part is coaxially provided with an avoiding hole, the hole wall of the avoiding hole is provided with a threaded part, the periphery of the deformation part is provided with a plurality of deformation seams penetrating the avoiding hole, the outer wall of the vertical plate is horizontally provided with two sliding rods, one end of each of the two sliding rods towards the sliding seat is fixedly connected with a connecting arm, and the opposite ends of the two connecting arms are fixedly connected with a floating sleeve, the end face of the floating sleeve is provided with a tapered hole matched with the deformation part, and one end of the sliding rod away from the connecting arm is fixedly sleeved with a stop nut.

[0034] Through the above technical scheme, when the extrusion part moves to the fixed position towards the sliding seat, the end face of the stop nut will be in contact with the surface of the vertical plate, so that the extrusion part moves relative to the floating sleeve, the inner wall of the tapered hole on the floating sleeve slides relative to the deformation part, the deformation part is elastically deformed, the threaded part in the avoiding hole tightly bites the threaded part of the end of the piston rod of the hydraulic cylinder, and the retraction of the piston rod is avoided.

[0035] Compared with the prior art, the beneficial effects of the present application are:

[0036] 1、In the present application, the extrusion unit generates extrusion force on the end of the piston rod of the hydraulic cylinder placed on the top of the sliding seat, so that the piston rod moves and the piston of the hydraulic cylinder extrudes the air in the cylinder body of the hydraulic cylinder, so that the air in the cylinder body is extruded into a compressed state, and after the piston rod is extruded to the position and pressure is maintained for a period of time, the air pressure in the cylinder body is detected by the pressure detection unit, so that the leakage of the cylinder body and the piston can be quickly detected, and when the next detection is performed, there is no need to wait for a long time, and the outer threaded part on the connecting column can be screwed into the pipe interface of the hydraulic cylinder by moving the connecting column downward and rotating the connecting column, so that the pipe interface of the hydraulic cylinder is connected without manual operation.

[0037] 2. In the present invention, when the connecting post rotates, the roller rolls on the upper end surface of the fixing ring. When the roller rolls from the upper end surface of the fixing ring to the surface of the arc-shaped protrusion, it generates a downward squeezing force on the fixing ring, thereby causing the fixing ring to drive the connecting post downward, causing the external thread portion of the connecting post to quickly move downward into the pipe interface of the hydraulic oil cylinder. Then, as the connecting post rotates, the external thread portion on the connecting post and the internal thread of the pipe interface of the hydraulic oil cylinder are threadedly engaged. This eliminates the need for manual connection of the pipe interface and simplifies the structure.

[0038] 3. In the present invention, when the extrusion part moves toward the sliding seat to a fixed position, the end face of the stop nut will contact the surface of the vertical plate, thereby causing the extrusion part to move relative to the floating sleeve, causing the inner wall of the tapered hole on the floating sleeve and the deformation part to slide relative to each other, thereby causing the deformation part to produce elastic contraction deformation, causing the threaded portion in the avoidance hole to bite the threaded portion at the end of the hydraulic cylinder piston rod, thereby preventing the piston rod from retracting. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic diagram of the overall structure of a hydraulic cylinder seal detection device for logging and forestry machinery in the present invention;

[0040] Figure 2 for Figure 1 Schematic diagram of the position relationship of the first perspective;

[0041] Figure 3 for Figure 1 Schematic diagram of the positional relationship of the second perspective;

[0042] Figure 4 Schematic diagram of the positional relationship among the connecting column, rotary joint and pressure gauge after assembly in the present invention;

[0043] Figure 5 for Figure 4 A schematic diagram of the positional relationship from another perspective;

[0044] Figure 6 for Figure 4 A magnified schematic diagram of the local structure at point A;

[0045] Figure 7 Schematic diagram of the positional relationship among the extrusion cylinder, the extrusion part and the floating sleeve after assembly in the present invention;

[0046] Figure 8 for Figure 7 Schematic diagram of the exploded decomposition of the structure.

[0047] In the figure, the description of each figure mark is as follows: 1. Machine base; 2. Extrusion cylinder; 3. Vertical plate; 4. Fixed plate; 5. Pressure gauge; 6. Translation cylinder; 7. Fixed block; 8. Hydraulic cylinder; 9. Sliding seat; 10. Connecting column; 11. Servo motor; 12. Rotary joint; 13. Hollow seat; 14. Lifting ring; 15. Limit nut; 16. Spring; 17. Rotating sleeve; 18. External threaded portion; 19. Roller; 20. Mounting arm; 21. Arc-shaped protrusion; 22. Guide rod; 23. Fixed ring; 24. Flange ring; 25. Connecting hole; 26. Stop nut; 27. Sliding rod; 28. Extrusion portion; 29. ​​Connecting arm; 30. Avoidance hole; 31. Tapered hole; 32. Floating sleeve; 33. Limit pin; 34. Deformation portion; 35. Waist-shaped groove; 36. Deformation seam. DETAILED DESCRIPTION

[0048] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0049] See also Figure 1 - Figure 8 The present invention provides a technical solution: a hydraulic cylinder seal detection device for a logging and forestry machinery, comprising a machine base 1, a linear slide rail is mounted on the top of the machine base 1, a linear slider is mounted on the linear slide rail, a sliding seat 9 is mounted on the linear slider, the sliding seat 9 is horizontally slidably connected to the top of the machine base 1 through the linear slider and the linear slide rail, and a translation cylinder 6 is mounted on the end of the top of the machine base 1 corresponding to the movement direction of the sliding seat 9, and the cylinder rod of the translation cylinder 6 is connected to the sliding seat 9, so that the cylinder rod of the translation cylinder 6 can reciprocate and retract. When the sliding seat 9 is turned, it can drive the sliding seat 9 to move horizontally. The top of the sliding seat 9 is connected to a fixing block 7 by screws, and the fixing block 7 is arranged at one end of the sliding seat 9 perpendicular to the movement direction of the sliding seat 9 on the machine base 1. A notch-shaped card slot is opened on the outer wall of the fixing block 7 facing the center side of the sliding seat 9. The width of the card slot is consistent with the width of the tail end of the hydraulic oil cylinder 8 to be tested, so that the tail end of the hydraulic oil cylinder 8 can be stuck in the card slot, thereby preventing the hydraulic oil cylinder 8 from moving toward the movement direction of the sliding seat 9 on the top of the machine base 1;

[0050] The top of the base 1 is connected to the two ends of the sliding base 9 in a vertical direction by screws. The upper ends of the two vertical plates 3 are connected to the fixed plate 4 by screws. The top of the fixed plate 4 is connected to the rotating sleeve 17 by installing a bearing for vertical rotation. The rotating sleeve 17 is hollow. The middle hole of the rotating sleeve 17 is coaxially penetrated with a connecting column 10. The periphery of the connecting column 10 is key-connected to the middle hole wall of the rotating sleeve 17. In this way, the connecting column 10 can rotate synchronously with the rotating sleeve 17. At the same time, the connecting column 10 can also be linearly rotated on the rotating sleeve 17 along the axial direction of the rotating sleeve 17. Movement, a servo motor 11 is installed at the bottom of the fixed plate 4, the motor shaft of the servo motor 11 is fixedly sleeved with a driving pulley, and the periphery of the rotating sleeve 17 is fixedly sleeved with a driven pulley, and the driving pulley and the driven pulley are connected by a V-belt. In this way, when the motor shaft of the servo motor 11 rotates, it can drive the rotating sleeve 17 to rotate through the transmission between the driving pulley and the driven pulley. When the rotating sleeve 17 rotates, it can drive the connecting column 10 to rotate. In addition, an electronic control module for controlling the speed and direction of the servo motor 11 is provided on the machine base 1;

[0051] The lower end of the connecting column 10 is coaxially provided with an external threaded portion 18, and the top of the connecting column 10 is coaxially provided with a communicating hole 25 that passes through the lower end surface of the external threaded portion 18. The external threaded portion 18 matches the internal thread of the pipe interface on the hydraulic oil cylinder 8, that is, the external threaded portion 18 can be smoothly screwed into the internal thread of the pipe interface on the hydraulic oil cylinder 8. In addition, the top of the connecting column 10 is coaxially connected to the rotary joint 12 (the rotary joint 12 is a common structure in this field, and its structure is not repeated here). The top of the fixed plate 4 is connected to the hollow seat 13, and the hollow seat 13 is connected to the rotary joint through a hose. The joint 12 is connected through, and a pressure gauge 5 is installed on the top of the hollow seat 13. The pressure gauge 5 is connected to the inner cavity of the hollow seat 13. The periphery of the connecting column 10 is coaxially fixedly sleeved with a fixing ring 23. The upper end surface of the fixing ring 23 is fixedly connected with an arc-shaped protrusion 21. The arc-shaped protrusion 21 and the end surface of the fixing ring 23 have a smooth transition surface. The arc-shaped protrusion 21 is made of rubber material. The bottom of the fixing plate 4 is connected with a flange ring 24. The lower end surface of the flange ring 24 is vertically fixed with a mounting arm 20. The lower end of the mounting arm 20 is rotatably connected to a roller 19, and the roller 19 rolls in contact with the upper end surface of the fixing ring 23.

[0052] When the hydraulic cylinder 8 moves to the bottom of the connecting column 10 with the sliding seat 9, a pipe interface at the tail end of the hydraulic cylinder 8 is located directly below the connecting column 10 and is coaxial with the connecting column 10. The rotating sleeve 17 rotates, causing the roller 19 to roll from the upper end surface of the fixing ring 23 to the upper surface of the arc-shaped protrusion 21, thereby causing the fixing ring 23 to drive the connecting column 10 to move downward, causing the external threaded portion 18 of the connecting column 10 to move downward and extend into the pipe interface of the hydraulic cylinder 8. The rotation of the rotating sleeve 17 then causes the external threaded portion 18 to be threadedly engaged with the internal thread of the pipe interface, so that the external threaded portion 18 can be assembled with the pipe interface. Since the flange ring 24 is fixed on the fixing plate 4, when the external threaded portion 18 and the internal thread of the pipe interface are threadedly engaged, as the external threaded portion 18 is screwed together, the external threaded portion 18 will drive the connecting column 10 to move downward. , and makes the arc-shaped protrusion 21 away from the roller 19, so when the connecting column 10 continues to rotate, the roller 19 will not contact the arc-shaped protrusion 21. In addition, since the arc-shaped protrusion 21 is made of rubber material, the arc-shaped protrusion 21 has a certain elastic deformation ability. When the roller 19 contacts the upper surface of the arc-shaped protrusion 21, the external threaded portion 18 contacts the inner bottom wall of the pipe interface, and the arc-shaped protrusion 21 produces a certain degree of deformation, so that when the connecting column 10 rotates, the external threaded portion 18 is continuously subjected to the downward force of the arc-shaped protrusion 21 on the fixing ring 23 in a short time, so that the external threaded portion 18 can be smoothly screwed into the internal thread of the pipe interface. In this way, when the connecting column 10 rotates in the opposite direction, so that the external threaded portion 18 and the internal thread of the pipe interface are screwed in the opposite direction, the fixing ring 23 will gradually move upward and approach the roller 19;

[0053] When the external threaded portion 18 is nearly completely disengaged from the internal thread of the pipe interface, the roller 19 contacts the upper surface of the arc-shaped protrusion 21, and the roller 19 exerts a downward squeezing force on the upper surface of the arc-shaped protrusion 21. Since the external threaded portion 18 and the internal thread of the pipe interface are not completely disengaged from each other, the arc-shaped protrusion 21 is squeezed and deformed. When the external threaded portion 18 is completely disengaged from the internal thread of the pipe interface, the roller 19 also loses the rolling contact with the surface of the arc-shaped protrusion 21.

[0054] The periphery of the fixing ring 23 is rotatably sleeved with a lifting ring 14 through an installed bearing. A guide rod 22 is vertically fixed on each side of the lifting ring 14. The upper end of the guide rod 22 slides through the fixing plate 4 and is fixedly sleeved with a limit nut 15. A spring 16 is provided between the limit nut 15 and the fixing plate 4. The spring 16 is sleeved on the periphery of the guide rod 22, and the two ends in the elastic direction elastically press against the limit nut 15 and the top surface of the fixing plate 4 respectively. When the fixing ring 23 moves downward, the guide rod 22 will move downward synchronously, and the limit nut 15 will compress the spring 16, so that the spring 16 accumulates elastic potential energy. When the external threaded portion 18 is disengaged from the threaded engagement with the internal thread of the pipe interface, the elastic potential energy of the spring 16 is released, thereby causing the connecting column 10 to move upward rapidly, so that the external threaded portion 18 moves up to the top of the hydraulic cylinder 8;

[0055] An extrusion cylinder 2 is horizontally mounted on the outer wall of a vertical plate 3 away from the fixed block 7, and the extrusion cylinder 2 drives an extrusion part 28 (such as Figure 7 As shown), the extrusion portion 28 is integrally fixed with a deformation portion 34 at one end away from the extrusion cylinder 2. The outer diameter of the deformation portion 34 decreases in sequence in the direction away from the extrusion portion 28. The deformation portion 34 is coaxially provided with an avoidance hole 30. The hole wall of the avoidance hole 30 is provided with a threaded portion. The periphery of the deformation portion 34 is provided with a plurality of deformation seams 36 that intersect with the avoidance hole 30. Two sliding rods 27 are horizontally slidably penetrated by the outer wall of the vertical plate 3. The two sliding rods 27 are respectively fixed with a connecting arm 29 at one end facing the sliding seat 9. The opposite ends of the two connecting arms 29 are fixed with a floating sleeve 32. The floating sleeve 3 A tapered hole 31 is formed on the end surface thereof for use with the deforming portion 34. A stop nut 26 is fixedly sleeved on the end of the sliding rod 27 away from the connecting arm 29. In this embodiment, the extrusion portion 28 and the deforming portion 34 are made of spring steel. In addition, an ear block is fixedly connected to the periphery of the floating sleeve 32. A limit pin 33 is vertically fixedly penetrated through the end of the ear block facing the extrusion portion 28. A waist-shaped groove 35 is formed on the periphery of the extrusion portion 28 for the end of the limit pin 33 to engage. The limit pin 33 slides and is limited in position within the waist-shaped groove 35, so that the floating sleeve 32 will not be separated from the deforming portion 34.

[0056] Working principle of the present invention:

[0057] In the initial stage, the piston rod of the hydraulic cylinder 8 is in an extended state. The hydraulic cylinder 8 is placed flat on the top of the sliding seat 9, and the tail end of the hydraulic cylinder 8 is inserted into the slot of the fixed block 7 to pre-position the hydraulic cylinder 8. The translation cylinder 6 is started, and the cylinder rod of the translation cylinder 6 is shortened, driving the sliding seat 9 to move, so that the hydraulic cylinder 8 moves to the bottom of the fixed plate 4, and the pipe interface at the tail of the hydraulic cylinder 8 is just below the connecting column 10, and is coaxial with the connecting column 10.

[0058] Start the servo motor 11, the motor shaft of the servo motor 11 rotates, and through the transmission of the active pulley and the driven pulley, the rotating sleeve 17 is driven to rotate. When the rotating sleeve 17 rotates, the roller 19 rolls from the upper end surface of the fixed ring 23 to the upper surface of the arc-shaped protrusion 21, so that the fixed ring 23 drives the connecting column 10 to move downward, so that the external threaded portion 18 of the connecting column 10 moves downward and extends into the pipe interface of the hydraulic cylinder 8, and then through the rotation of the rotating sleeve 17, the external threaded portion 18 is threadedly engaged with the internal thread of the pipe interface, so that the external threaded portion 18 can be assembled with the pipe interface. Since the flange ring 24 is fixed on the fixed plate 4, when the external threaded portion 18 and the internal thread of the pipe interface are threadedly engaged, as the external threaded portion 18 When the connecting post 10 is screwed together, the external threaded portion 18 will drive the connecting post 10 to move downward and make the arc-shaped protrusion 21 away from the roller 19. Therefore, when the connecting post 10 continues to rotate, the roller 19 will not contact the arc-shaped protrusion 21. In addition, since the arc-shaped protrusion 21 is made of rubber material, the arc-shaped protrusion 21 has a certain elastic deformation ability. When the roller 19 contacts the upper surface of the arc-shaped protrusion 21, the external threaded portion 18 contacts the inner bottom wall of the pipe interface, and the arc-shaped protrusion 21 is deformed to a certain extent. As a result, when the connecting post 10 rotates, the external threaded portion 18 is continuously subjected to the downward force of the arc-shaped protrusion 21 on the fixing ring 23 in a short period of time, thereby enabling the external threaded portion 18 to be smoothly screwed into the internal thread of the pipe interface.

[0059] When the extrusion cylinder 2 is started, the cylinder rod of the extrusion cylinder 2 is extended, thereby driving the extrusion part 28 to move in the direction of the hydraulic oil cylinder 8, so that the end face of the extrusion part 28 contacts the end face of the piston rod of the hydraulic oil cylinder 8, and as the cylinder rod of the extrusion cylinder 2 continues to slowly extend, the extrusion part 28 squeezes the end face of the piston rod of the hydraulic oil cylinder 8, and the piston rod of the hydraulic oil cylinder 8 is retracted into the hydraulic oil cylinder 8. During the retraction process of the piston rod, the piston of the hydraulic oil cylinder 8 slides in the cylinder body of the hydraulic oil cylinder 8 and squeezes the air in the cylinder body to the pipe interface at its tail end. The air then enters the rotary joint 12 through the connecting hole 25 of the connecting column 10, and then enters the pressure gauge 5 through the rotary joint 12, the hose, and the hollow seat 13. After the cylinder rod of the extrusion cylinder 2 is extended to the position, it is maintained for a period of time. During this time, the air pressure change indicated by the pressure gauge 5 is observed. If the air pressure indication value changes from large to small, it is determined that the cylinder body is leaking, otherwise there is no leakage.

[0060] When the extrusion portion 28 moves toward the sliding seat 9 to the fixed position, the end face of the stop nut 26 will contact the surface of the vertical plate 3, thereby causing the extrusion portion 28 to move relative to the floating sleeve 32, causing the inner wall of the tapered hole 31 on the floating sleeve 32 and the deformed portion 34 to slide relative to each other, thereby causing the deformed portion 34 to elastically contract and deform, causing the threaded portion in the avoidance hole 30 to bite the threaded portion at the end of the piston rod of the hydraulic cylinder 8, thereby preventing the piston rod from retracting (refer to Figure 3The retraction phenomenon refers to the phenomenon that after the cylinder rod of the extrusion cylinder 2 is extended to its full length, when the air in the cylinder body quickly enters the connecting column 10, the hose, the hollow seat 13 and the pressure gauge 5, the air pressure in the left space inside the cylinder body is temporarily lower than the air pressure in the right space inside the cylinder body, causing the piston to drive the piston rod to move slightly toward the tail end of the hydraulic cylinder 8, thereby causing a gap to be generated between the end of the piston rod and the end face of the extrusion part 28, thereby affecting the extrusion force of the extrusion part 28 on the piston rod, resulting in insufficient air pressure in the cylinder body, which leads to an error in the indication of the pressure gauge 5).

[0061] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the invention, and the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A hydraulic cylinder seal detection device for logging and forestry machinery, characterized in that: include: A machine base (1) and a sliding base (9) horizontally slidably connected to the top of the machine base (1); a cylinder positioning unit provided on the sliding seat (9); Two vertical plates (3) connected to the top of the machine base (1) and a fixing plate (4) fixed to the top of the two vertical plates (3); an extrusion unit mounted on one of the vertical plates (3); A rotating sleeve (17) vertically rotatably connected to the fixed plate (4); A connecting column (10) is coaxially slidably inserted into the rotating sleeve (17), the peripheral edge of the connecting column (10) is key-connected to the inner hole of the rotating sleeve (17), the lower end of the connecting column (10) is coaxially provided with an external threaded portion (18), and the top of the connecting column (10) is coaxially provided with a connecting hole (25) penetrating the lower end surface of the external threaded portion (18); A pressure detection unit mounted on the top of the fixed plate (4); A downward movement unit is provided at the bottom of the fixing plate (4), and is used to drive the external threaded portion (18) to move downward when the connecting column (10) rotates; The downward movement unit includes a fixing ring (23) coaxially fixedly sleeved on the periphery of the connecting column (10), the upper end surface of the fixing ring (23) is fixedly connected with an arc-shaped protrusion (21), the bottom of the fixing plate (4) is connected with a flange ring (24), the lower end surface of the flange ring (24) is vertically fixedly connected with a mounting arm (20), the lower end of the mounting arm (20) is rotatably connected with a roller (19), the roller (19) rolls in contact with the upper end surface of the fixing ring (23), and an elastic reset unit is provided on the fixing plate (4), and the elastic reset structure gives the connecting column (10) potential energy for upward movement; The extrusion unit comprises an extrusion cylinder (2) mounted horizontally on the outer wall of the vertical plate (3); the extrusion cylinder (2) is driven and connected to an extrusion portion (28); an anti-retraction structure is provided at the end of the extrusion portion (28); The anti-retraction structure includes a deformation portion (34) integrally formed and fixedly connected to the end of the extrusion portion (28) away from the extrusion cylinder (2), the outer diameter of the deformation portion (34) decreases in sequence in the direction away from the extrusion portion (28), the deformation portion (34) is coaxially provided with an avoidance hole (30), the hole wall of the avoidance hole (30) is provided with a threaded portion, and the periphery of the deformation portion (34) is provided with a plurality of deformation seams (36) that are connected to the avoidance hole (30), and two sliding rods (27) are horizontally slidably penetrated through the outer wall of the vertical plate (3), and the two sliding rods (27) are respectively fixedly connected to a connecting arm (29) at one end facing the sliding seat (9), and the opposite ends of the two connecting arms (29) are fixedly connected to a floating sleeve (32), and the end surface of the floating sleeve (32) is provided with a tapered hole (31) used in conjunction with the deformation portion (34), and the end of the sliding rod (27) away from the connecting arm (29) is fixedly sleeved with a stop nut (26).

2. A logging and forestry machinery hydraulic oil cylinder body sealing detection device according to claim 1, characterized in that: A translation cylinder (6) is horizontally mounted on the top of the machine base (1), and a cylinder rod of the translation cylinder (6) is drivingly connected to the sliding seat (9).

3. The hydraulic cylinder seal detection device for logging and forestry machinery according to claim 1, characterized in that: The cylinder positioning unit comprises a fixed block (7) connected to the top of the sliding seat (9), and a notch-shaped slot is provided on an outer wall of one side of the fixed block (7).

4. The hydraulic cylinder seal detection device for logging and forestry machinery according to claim 1, characterized in that: A servo motor (11) is vertically mounted on the bottom of the fixed plate (4), and the motor shaft of the servo motor (11) is transmission-connected to the rotating sleeve (17) via a transmission member.

5. The hydraulic cylinder seal detection device for logging and forestry machinery according to claim 1, characterized in that: The pressure detection unit includes a rotary joint (12) rotatably connected to the top of the connecting column (10); a hollow seat (13) is connected to the top of the fixed plate (4); the hollow seat (13) is connected to the rotary joint (12) through a hose; a pressure gauge (5) is installed on the top of the hollow seat (13); the pressure gauge (5) is connected to the inner cavity of the hollow seat (13).

6. The hydraulic cylinder seal detection device for logging and forestry machinery according to claim 1, characterized in that: The arc-shaped protrusion (21) is made of rubber material.

7. The logging and forestry machinery hydraulic cylinder seal detection device according to claim 1, characterized in that: The elastic reset structure comprises a lifting ring (14) rotatably sleeved on the periphery of the fixed ring (23), guide rods (22) are vertically and fixedly provided on both sides of the lifting ring (14), the upper ends of the guide rods (22) slide through the fixed plate (4) and are fixedly sleeved on the limiting nut (15), and an elastic member is provided between the limiting nut (15) and the fixed plate (4).

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