Clutch type full-closed manual structure straight stroke executing mechanism

Abstract

The utility model relates to the technical field of straight stroke air cylinders, in particular to a clutch type full-closed manual structure straight stroke executing mechanism which comprises a full-closed shell, a transmission bevel gear is rotationally connected in the full-closed shell, a bevel gear is connected to the transmission bevel gear in a meshed mode, a transmission shaft is fixedly connected to the bevel gear, and the transmission shaft is fixedly connected to the full-closed shell. The transmission shaft penetrates out of the full-sealed shell and is fixedly connected with a hand wheel, a mounting hole is formed in the center of the transmission bevel gear, a rotating sleeve is mounted in the mounting hole, a positioning pin hole is formed between the rotating sleeve and the transmission bevel gear, a positioning pin is inserted into the positioning pin hole, and a transmission nut is connected to the rotating sleeve in an abutting mode. The abutting face of the transmission nut and the rotating sleeve is roughened, a threaded through hole is formed in the center of the transmission nut, and a transmission rod is in threaded connection with the interior of the threaded through hole. According to the utility model, reliable switching between manual rotation and power transmission is realized.

Description

Technical Field

[0001] This utility model relates to the field of linear stroke cylinder technology, specifically to a clutch-type fully enclosed manual linear stroke actuator. Background Technology

[0002] In the field of industrial automation, linear cylinders, as core actuators, are widely used in high-precision linear motion scenarios such as valve opening and closing, and mechanical positioning, especially in industries with stringent safety and reliability requirements, such as petrochemicals and power systems. Traditional linear cylinders typically rely on pneumatic or electric drives, but in practical applications, they exhibit significant limitations: when the driving energy (such as compressed air or electricity) is suddenly interrupted, operators must switch to manual mode by disassembling the air line connector or using external tools. This process is time-consuming and may cause the piston rod to unexpectedly retract due to air line depressurization, posing a risk of equipment damage or personnel safety hazards. Utility Model Content

[0003] To address the aforementioned issues, a clutch-type fully enclosed manual linear actuator is provided. A handwheel drives a bevel gear to mesh with a transmission bevel gear, converting rotary motion into radial rotation. The rotating sleeve and transmission bevel gear are rigidly connected via a locating pin; removing the locating pin disconnects power transmission, establishing the clutch mechanism. A roughened contact surface utilizes friction to drive the transmission nut to rotate, which, in conjunction with the threaded pair, propels the transmission rod to linear motion. The fully enclosed housing effectively prevents contamination and ensures operational safety, resolving the power dependence problem and integrating reliable manual control with an emergency clutch function.

[0004] To address the existing technical problems, this utility model provides a clutch-type fully enclosed manual linear actuator, comprising a fully enclosed housing, a transmission bevel gear rotatably connected inside the housing, a bevel gear meshing with the transmission bevel gear, a transmission shaft fixedly connected to the bevel gear, the transmission shaft extending out of the housing and fixedly connected to a handwheel, a mounting hole at the center of the transmission bevel gear, a rotating sleeve installed in the mounting hole, a locating pin hole between the rotating sleeve and the transmission bevel gear, a locating pin inserted into the locating pin hole, a transmission nut abutting against the rotating sleeve, the contact surface between the transmission nut and the rotating sleeve being roughened, a threaded through hole at the center of the transmission nut, and a transmission rod threadedly connected to the threaded through hole.

[0005] Preferably, the rotating sleeve has a protrusion on the contact surface with the transmission nut, and the transmission nut has a groove on the contact surface with the rotating sleeve that matches the protrusion. When the rotating sleeve abuts against the transmission nut, the protrusion is inserted into the groove.

[0006] Preferably, the top of the fully enclosed housing is provided with a fixed sleeve, the inner surface of the fixed sleeve is provided with threads, a lower pressure block is connected to the inner thread of the fixed sleeve, and a sliding sleeve is connected to the transmission nut. When the lower pressure block presses down on the sliding sleeve until the transmission nut abuts against the rotating sleeve, the lower pressure block can rotate relative to the sliding sleeve.

[0007] Preferably, a clutch switching handle is fixedly connected to the lower pressure block.

[0008] Preferably, a locking hole is provided between the clutch switching handle and the fixed sleeve, and a locking pin is inserted into the locking hole.

[0009] Preferably, a linear stroke cylinder is connected to the lower end of the fully enclosed housing, and a connecting piston rod is provided inside the linear stroke cylinder, which is connected to the transmission rod.

[0010] Preferably, the air chamber of the linear cylinder is connected to an air inlet and an air outlet at both ends, the air inlet is connected to an external air source pipeline and is equipped with a pneumatic control valve, the pneumatic control valve controls the movement speed and output force of the piston rod by adjusting the air inlet pressure.

[0011] Preferably, the fixed sleeve is provided with a limiting ring to prevent the transmission rod from deviating.

[0012] The advantages of this utility model compared to the prior art are:

[0013] 1. This utility model achieves reliable switching between manual rotation and power transmission by setting up a clutch structure of transmission bevel gear, rotating sleeve, and positioning pin, combined with the rough contact surface between the transmission nut and rotating sleeve and the convex-groove fitting design. The insertion and removal of the positioning pin controls the power on / off. The dual transmission mechanism of rough treatment and mechanical fitting ensures the stability of power transmission and allows for moderate slippage in the clutch state, preventing the mechanism from jamming. This solves the problem of traditional pneumatic actuators relying on a single power source and being prone to failure.

[0014] 2. This utility model employs a fully enclosed housing integrating a fixed sleeve, a sliding sleeve, and a linear-stroke cylinder. This encloses the gear set, transmission components, and pneumatic components within the housing, preventing the intrusion of external contaminants. Simultaneously, a limiting ring constrains the radial offset of the transmission rod, forcibly maintaining axial alignment. This structure enhances the durability of the mechanism in complex environments, strengthens operational safety by preventing exposed moving parts, and achieves compatibility between pneumatic and manual drives, preventing accidental reversal of the handwheel during pneumatic operation.

[0015] 3. The linkage design between the threaded lower pressure block and the clutch switching handle in this utility model, combined with the mechanical locking function of the locking pin, simplifies the clutch state switching and fixing operation. The operator only needs to pull the handle to control the engagement or disengagement of the transmission nut and the rotating sleeve through axial pressure. The locking pin further prevents accidental state switching, improves the convenience of operation and system stability, and meets the requirements for precise control of linear stroke. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of a clutch-type fully enclosed manual linear actuator according to this utility model.

[0017] Figure 2 This is a three-dimensional schematic diagram of the limiting ring of a clutch-type fully enclosed manual linear actuator according to this utility model.

[0018] Figure 3 This is an exploded view of the internal structure of the fully enclosed housing of a clutch-type fully enclosed manual linear actuator according to this utility model.

[0019] Figure 4 yes Figure 3 A three-dimensional diagram from the bottom perspective.

[0020] Figure 5 This is a top view of a clutch-type fully enclosed manual linear actuator according to this utility model.

[0021] Figure 6 yes Figure 5 Sectional view of AA.

[0022] The following are the labels in the diagram: 1. Fully enclosed housing; 2. Transmission bevel gear; 3. Bevel gear; 4. Handwheel; 5. Rotating sleeve; 6. Transmission nut; 7. Transmission rod; 8. Fixed sleeve; 9. Lower pressure block; 10. Sliding sleeve; 11. Clutch switching handle; 12. Locking pin; 13. Linear stroke cylinder; 14. Connecting piston rod; 15. Limit ring. Detailed Implementation

[0023] To further understand the features, technical means, and specific objectives and functions achieved by this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments.

[0024] Reference Figures 1-6As shown: A clutch-type fully enclosed manual linear actuator includes a fully enclosed housing 1. A transmission bevel gear 2 is rotatably connected inside the fully enclosed housing 1. A bevel gear 3 is meshed with the transmission bevel gear 2. A transmission shaft is fixedly connected to the bevel gear 3. The transmission shaft passes through the fully enclosed housing 1 and is fixedly connected to a handwheel 4. A mounting hole is opened at the center of the transmission bevel gear 2. A rotating sleeve 5 is installed in the mounting hole. A positioning pin hole is opened between the rotating sleeve 5 and the transmission bevel gear 2. A positioning pin is inserted into the positioning pin hole. A transmission nut 6 abuts against the rotating sleeve 5. The abutting surface between the transmission nut 6 and the rotating sleeve 5 is roughened. A threaded through hole is opened at the center of the transmission nut 6. A transmission rod 7 is threadedly connected to the threaded through hole.

[0025] In existing technologies, linear actuators generally rely directly on pneumatic components. If these pneumatic components lose power, the linear actuator loses its power source and stops operating. To address this problem, in this application, when the operator turns the handwheel 4, the rotational motion of the handwheel 4 is transmitted to the bevel gear 3 via the drive shaft. The bevel gear 3 meshes with the transmission bevel gear 2, converting the axial rotation of the drive shaft into the radial rotation of the transmission bevel gear 2, thereby driving the transmission bevel gear 2 to rotate around its own axis. A rotating sleeve 5 is fixed in the mounting hole at the center of the transmission bevel gear 2, and the two are rigidly connected by a locating pin. When the locating pin is inserted into the locating pin hole, the rotation of the transmission bevel gear 2 synchronously drives the rotating sleeve 5 to rotate; if the locating pin is pulled out, the power transmission between the transmission bevel gear 2 and the rotating sleeve 5 is cut off, the transmission bevel gear 2 spins freely, and the rotating sleeve 5 remains stationary, thus achieving a clutch function.

[0026] The end face of the rotating sleeve 5 and the contact surface with the transmission nut 6 are roughened to transmit the rotational motion of the rotating sleeve 5 to the transmission nut 6 through friction. The transmission nut 6 has a threaded through hole inside, forming a threaded pair with the transmission rod 7. The rotation of the transmission nut 6 drives the transmission rod 7 to move linearly along the axial direction. The roughening of the contact surface increases the coefficient of friction, ensuring reliable power transmission. At the same time, it allows for moderate slippage between the transmission nut 6 and the rotating sleeve 5 in the clutch state, preventing the mechanism from jamming.

[0027] Throughout the transmission process, the fully enclosed housing 1 encloses core components such as the gear set, rotating sleeve 5, and transmission nut 6 within a sealed space, effectively isolating them from external dust, liquids, and other contaminants. This also prevents operators from contacting moving parts, enhancing the mechanism's safety and durability. Ultimately, the manual rotation of the handwheel 4 is converted into the linear stroke output of the transmission rod 7 through gear transmission, clutch control, and threaded pair conversion, meeting the linear motion requirements under specific working conditions.

[0028] Reference Figures 1-4As shown: The rotating sleeve 5 has a protrusion on the contact surface with the transmission nut 6, and the transmission nut 6 has a groove on the contact surface with the rotating sleeve 5 that matches the protrusion. When the rotating sleeve 5 and the transmission nut 6 abut, the protrusion is inserted into the groove.

[0029] The protrusion on the end face of the rotating sleeve 5 is embedded in the corresponding groove of the transmission nut 6, forming a mechanical fitting structure. The cooperation between the protrusion and the groove directly transmits the rotational power of the rotating sleeve 5 to the transmission nut 6. At the same time, the rough treatment of the contact surface further assists the power transmission through friction, enhancing the reliability of the transmission.

[0030] Reference Figures 1-4 As shown: The top of the fully enclosed housing 1 is provided with a fixed sleeve 8. The inner surface of the fixed sleeve 8 is provided with threads. A lower pressure block 9 is connected to the inner thread of the fixed sleeve 8. A sliding sleeve 10 is connected to the transmission nut 6. When the lower pressure block 9 presses down on the sliding sleeve 10 until the transmission nut 6 abuts against the rotating sleeve 5, the lower pressure block 9 can rotate relative to the sliding sleeve 10.

[0031] When the operator rotates the lowering block 9, the lowering block 9 moves axially downwards through the threads on the inner surface of the fixed sleeve 8, pushing the sliding sleeve 10, which contacts it, downwards simultaneously. The sliding sleeve 10 is fixedly connected to the transmission nut 6, and its downward pressing action forces the transmission nut 6 to move towards the rotating sleeve 5 until the abutment surfaces of the transmission nut 6 and the rotating sleeve 5 are tightly fitted. At this time, the frictional force generated by the rough treatment of the contact surface transmits the rotational power of the rotating sleeve 5 to the transmission nut 6, driving the transmission rod 7 to achieve linear motion.

[0032] The lower pressure block 9 and the sliding sleeve 10 are allowed to rotate relative to each other: when the transmission nut 6 rotates with the rotating sleeve 5, the sliding sleeve 10 rotates synchronously because it is fixed to the transmission nut 6, but the lower pressure block 9 is fixed to the top of the housing by a threaded connection and is subject to external operational constraints, so it does not rotate with the sliding sleeve 10. This design ensures that the lower pressure block 9 maintains the contact state between the transmission nut 6 and the rotating sleeve 5 only through axial pressure, without interfering with the rotational freedom of the transmission nut 6, thereby ensuring the continuity of power transmission.

[0033] When power needs to be cut off, the lower pressure block 9 is rotated in the opposite direction to make it rise along the thread. The sliding sleeve 10 and the transmission nut 6 disengage from the rotating sleeve 5 under the action of the reset force. The transmission nut 6 stops rotating, and the linear motion of the transmission rod 7 is terminated.

[0034] Reference Figures 1-4 As shown: A clutch switching handle 11 is fixedly connected to the lower pressure block 9.

[0035] The operator applies rotational force by turning the clutch switching handle 11, which causes the lower pressure block 9, which is fixedly connected to it, to rotate around the threaded axis of the fixed sleeve 8.

[0036] Reference Figures 1-4 As shown: A locking hole is provided between the clutch switching handle 11 and the fixed sleeve 8, and a locking pin 12 is inserted into the locking hole.

[0037] When the operator adjusts the axial position of the lower pressure block 9 using the clutch shift handle 11, if it is necessary to fix the current clutch engagement or disengagement, the locking pin 12 can be inserted into the locking hole between the clutch shift handle 11 and the fixed sleeve 8. The locking pin 12 passes through the corresponding hole of the handle and the fixed sleeve 8, forming mechanical interference, preventing the handle from rotating relative to the fixed sleeve 8, thereby limiting the axial movement of the lower pressure block 9 and maintaining the pressed or disengaged state of the transmission nut 6 and the rotating sleeve 5.

[0038] Reference Figures 1-6 As shown: The lower end of the fully enclosed housing 1 is connected to a linear stroke cylinder 13, and the linear stroke cylinder 13 is provided with a connecting piston rod 14, which is connected to the transmission rod 7.

[0039] When an external air source drives the linear cylinder 13, the air pressure acts on the piston, pushing the connecting piston rod 14 and the transmission rod 7 to move axially. At this time, if the clutch is in the disengaged state and the transmission nut 6 is disengaged from the rotating sleeve 5, the linear motion of the transmission rod 7 will not drive the manual rotation in the opposite direction, thus preventing the handwheel 4 from rotating accidentally.

[0040] The air chamber of the linear cylinder 13 is connected to an air inlet and an exhaust outlet at both ends. The air inlet is connected to an external air source pipeline and is equipped with a pneumatic control valve. The pneumatic control valve controls the movement speed and output force of the piston rod by adjusting the air inlet pressure.

[0041] The operator adjusts the intake pressure and flow rate of the external air source pipeline through the pneumatic control valve. The compressed gas enters the corresponding air chamber of the linear stroke cylinder 13 through the air inlet, pushing the piston to move to the other side, which in turn drives the connecting piston rod 14 and the transmission rod 7 to make linear motion.

[0042] Reference Figure 2 As shown: The fixed sleeve 8 is provided with a limiting ring 15 to prevent the transmission rod 7 from deviating.

[0043] When the operator drives the transmission rod 7 to make linear motion, the transmission rod 7 passes through the limiting ring 15 inside the fixed sleeve 8. The inner diameter of the limiting ring 15 is in clearance fit with the outer diameter of the transmission rod 7, thus constraining the radial movement of the transmission rod 7. When the transmission rod 7 is subjected to external load or installation deviation that causes a radial offset tendency, the limiting ring 15 counteracts the offset torque through the contact force between its inner wall and the surface of the transmission rod 7, forcing the transmission rod 7 to remain axially aligned and avoiding increased frictional resistance or transmission jamming caused by misalignment.

[0044] Working principle: When the operator turns handwheel 4, the rotational motion of handwheel 4 is transmitted to bevel gear 3 through the drive shaft. Bevel gear 3 meshes with drive bevel gear 2, converting the axial rotation of the drive shaft into the radial rotation of drive bevel gear 2, thereby driving drive bevel gear 2 to rotate around its own axis. A rotating sleeve 5 is fixed in the mounting hole at the center of drive bevel gear 2, and the two are rigidly connected by a locating pin. When the locating pin is inserted into the locating pin hole, the rotation of drive bevel gear 2 will synchronously drive the rotating sleeve 5 to rotate; if the locating pin is pulled out, the power transmission between drive bevel gear 2 and rotating sleeve 5 is cut off, drive bevel gear 2 spins freely, and rotating sleeve 5 remains stationary, realizing the clutch function. The contact surface between the end face of rotating sleeve 5 and drive nut 6 is roughened, and the rotational motion of rotating sleeve 5 is transmitted to drive nut 6 through friction. Drive nut 6 has a threaded through hole inside, forming a threaded pair with drive rod 7. The rotation of drive nut 6 will drive drive rod 7 to move linearly along the axial direction. The roughening of the contact surface increases the coefficient of friction, ensuring reliable power transmission. At the same time, it allows moderate slippage between the transmission nut 6 and the rotating sleeve 5 in the clutch state, preventing the mechanism from jamming.

[0045] A protrusion is provided on the contact surface between the rotating sleeve 5 and the transmission nut 6, and a corresponding groove is provided on the transmission nut 6. When the rotating sleeve 5 and the transmission nut 6 abut, the protrusion is embedded in the groove to form a mechanical fitting structure, directly transmitting rotational power. At the same time, the roughened contact surface assists in power transmission through friction, enhancing transmission reliability. A lower pressure block 9 is internally threaded onto the fixed sleeve 8 at the top of the fully enclosed housing 1. When the sliding sleeve 10 connected to the transmission nut 6 is pushed by the lower pressure block 9, the transmission nut 6 and the rotating sleeve 5 are tightly fitted. Relative rotation is allowed between the lower pressure block 9 and the sliding sleeve 10, ensuring that the lower pressure block 9 maintains the abutment state only through axial pressure, without interfering with the rotational freedom of the transmission nut 6. When the lower pressure block 9 is rotated in the opposite direction to rise, the sliding sleeve 10 and the transmission nut 6 disengage from the rotating sleeve 5, cutting off power transmission.

[0046] The clutch shift handle 11 is fixed to the lower pressure block 9. The operator can rotate and move the lower pressure block 9 axially by operating the handle. Inserting the locking pin 12 into the locking hole between the handle and the fixed sleeve 8 mechanically locks the current clutch engagement state, preventing accidental operation. The linear-stroke cylinder 13 at the lower end of the fully enclosed housing 1 is connected to the transmission rod 7 via a connecting piston rod 14. When an external air source drives the cylinder, the piston rod pushes the transmission rod 7. If the clutch is disengaged, the movement of the transmission rod 7 will not reverse-drive the manual components, preventing accidental rotation of the handwheel 4. The pneumatic control valve adjusts the intake pressure and flow rate, precisely controlling the piston rod's movement speed and output force. The limiting ring 15 inside the fixed sleeve 8 constrains the radial offset of the transmission rod 7 through a clearance fit, forcing it to maintain axial alignment and reducing frictional resistance and the risk of transmission jamming. The fully enclosed housing 1 encloses the core components in a sealed space, isolating contaminants and improving operational safety.

[0047] The above embodiments only illustrate one or more implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.

Claims

1. A clutch-type fully enclosed manual linear actuator, characterized in that, The device includes a fully enclosed housing (1), a transmission bevel gear (2) rotatably connected inside the fully enclosed housing (1), a bevel gear (3) meshing with the transmission bevel gear (2), a transmission shaft fixedly connected to the bevel gear (3), the transmission shaft passing through the fully enclosed housing (1) and fixedly connected to a handwheel (4); an installation hole is provided at the center of the transmission bevel gear (2), a rotating sleeve (5) is installed in the installation hole, a positioning pin hole is provided between the rotating sleeve (5) and the transmission bevel gear (2), a positioning pin is inserted into the positioning pin hole, a transmission nut (6) abuts against the rotating sleeve (5), the abutting surface of the transmission nut (6) and the rotating sleeve (5) is roughened, a threaded through hole is provided at the center of the transmission nut (6), and a transmission rod (7) is threadedly connected in the threaded through hole.

2. The clutch-type fully enclosed manual linear actuator according to claim 1, characterized in that, The rotating sleeve (5) has a protrusion on the contact surface with the transmission nut (6), and the transmission nut (6) has a groove on the contact surface with the rotating sleeve (5) that matches the protrusion. When the rotating sleeve (5) and the transmission nut (6) abut, the protrusion is inserted into the groove.

3. The clutch-type fully enclosed manual linear actuator according to claim 1, characterized in that, The top of the fully enclosed housing (1) is provided with a fixed sleeve (8), the inner surface of the fixed sleeve (8) is provided with threads, and a lower pressure block (9) is connected to the inner thread of the fixed sleeve (8). A sliding sleeve (10) is connected to the transmission nut (6). When the lower pressure block (9) presses down on the sliding sleeve (10) until the transmission nut (6) abuts against the rotating sleeve (5), the lower pressure block (9) can rotate relative to the sliding sleeve (10).

4. The clutch-type fully enclosed manual linear actuator according to claim 3, characterized in that, A clutch switching handle (11) is fixedly connected to the lower pressure block (9).

5. The clutch-type fully enclosed manual linear actuator according to claim 4, characterized in that, A locking hole is provided between the clutch switching handle (11) and the fixed sleeve (8), and a locking pin (12) is inserted into the locking hole.

6. The clutch-type fully enclosed manual linear actuator according to claim 3, characterized in that, The lower end of the fully enclosed housing (1) is connected to a linear stroke cylinder (13), and the linear stroke cylinder (13) is provided with a connecting piston rod (14), which is connected to the transmission rod (7).

7. A clutch-type fully enclosed manual linear actuator according to claim 6, characterized in that, The air chamber of the linear cylinder (13) is connected to an air inlet and an exhaust outlet at both ends. The air inlet is connected to an external air source pipeline and is equipped with a pneumatic control valve. The pneumatic control valve controls the movement speed and output force of the piston rod by adjusting the air inlet pressure.

8. A clutch-type fully enclosed manual linear actuator according to claim 3, characterized in that, The fixed sleeve (8) is provided with a limiting ring (15) to prevent the transmission rod (7) from deviating.

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